:root{--ink:#173c36;--muted:#78817d;--green:#286751;--lime:#d9e8a9;--bg:#f6f7f3;--line:#e4e8e0;--white:#fff;--red:#b44942}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,'Apple SD Gothic Neo','Noto Sans KR',sans-serif;font-size:14px;line-height:1.65}button,input,select,textarea{font:inherit}a{color:inherit;text-decoration:none}button,a,input,select,textarea{outline-offset:4px}button{cursor:pointer}button:disabled{cursor:default;opacity:.45}.sidebar{width:236px;position:fixed;inset:0 auto 0 0;padding:35px 22px 18px;background:#fff;border-right:1px solid var(--line);display:flex;flex-direction:column}.brand{display:flex;align-items:center;gap:12px;font-size:11px;line-height:1.3;letter-spacing:2px}.brand b{font-size:16px;letter-spacing:1px}.brandmark{font-family:Georgia,serif;font-size:53px;line-height:1;color:var(--green)}.edition{font-size:9px;color:#969d96;letter-spacing:1.4px;margin:33px 8px 17px}nav a{display:flex;align-items:center;gap:14px;padding:13px 15px;border-radius:9px;margin:4px 0;color:#747d76;font-size:18px}nav a span{font-size:14px}nav a.active{background:#edf2e8;color:var(--green);font-weight:700}nav small{margin-left:auto;font-size:11px}.side-bottom{margin-top:auto}.trial{background:#f6f7f0;border:1px solid #e8eadd;border-radius:12px;padding:19px 16px;margin-top:28px}.tiny{display:block;font-size:9px;letter-spacing:1.5px;color:#7e876f}.trial strong{display:block;font-size:17px;margin-top:8px}.trial p{font-size:12px;color:var(--muted)}.trial a{font-size:12px;color:var(--green);font-weight:600}.admin-link{display:block;padding:20px 10px;font-size:12px;color:var(--muted)}.profile{display:flex;align-items:center;gap:11px;border-top:1px solid var(--line);padding-top:18px}.avatar{border-radius:50%;background:#e8eedd;display:grid;place-items:center;width:34px;height:34px;font-family:Georgia,serif}.profile b{font-size:12px}.profile small{display:block;font-size:10px;color:var(--muted)}.status-dot{width:6px;height:6px;background:#74a276;border-radius:50%;margin-left:auto}.shell{margin-left:236px}header{height:84px;background:#ffffffb8;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 42px}.header-label{font-size:10px;color:#8c978d;letter-spacing:1.5px;margin-right:20px}.header-name{font-size:12px}.header-right{display:flex;gap:20px;align-items:center;font-size:12px}.demo-pill{border:1px solid #dfe6d4;background:#f6f8f0;border-radius:20px;padding:3px 10px;font-size:9px;letter-spacing:1px}main{max-width:1340px;margin:auto;padding:34px 42px 50px;min-height:calc(100vh - 140px)}h1{font-size:30px;letter-spacing:-1.2px;margin:6px 0 9px;font-weight:650}h2{font-size:19px;letter-spacing:-.5px;margin:0}h3{font-size:16px;margin:0}p{margin:8px 0}.muted{color:var(--muted)}.eyebrow{font-size:10px;letter-spacing:1.7px;color:#778c73;font-weight:600}.page-top{display:flex;align-items:flex-end;justify-content:space-between;margin-bottom:26px;gap:15px}.page-top p{color:var(--muted);font-size:13px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:15px;border:1px solid var(--line);background:#fff;padding:11px 19px;border-radius:8px;font-size:13px;color:var(--ink)}.btn.primary{background:var(--green);border-color:var(--green);color:white}.btn.light{background:#dbe9b7;color:#244b39;border:0}.btn.ghost{background:transparent}.hero{position:relative;overflow:hidden;min-height:240px;border-radius:15px;background:#1c4a3e;color:#fff;padding:33px 38px;display:flex;justify-content:space-between}.hero .eyebrow{color:#bacc9c}.hero h2{font-size:31px;line-height:1.5;letter-spacing:-1px;margin:10px 0}.hero p{color:#b7ccc0;font-size:13px;margin-bottom:24px}.hero-art{width:250px;position:relative;display:grid;place-items:center;flex-shrink:0}.book{transform:rotate(12deg);width:142px;height:187px;background:#e5edc9;border-radius:3px 10px 10px 3px;box-shadow:15px 15px 0 #112e2450,inset 8px 0 0 #b8c49b;padding:23px 21px;color:#214736;font-family:Georgia,serif;position:relative;z-index:2}.book span{font-size:8px;letter-spacing:2px}.book b{font-size:24px;line-height:1.1;display:block;margin-top:16px}.book i{font-size:40px;display:block;text-align:right}.orbit{position:absolute;width:240px;height:240px;border:1px solid #b8cc9b33;border-radius:50%}.orbit:after{content:'';position:absolute;inset:26px;border-radius:50%;border:1px solid #b8cc9b22}.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin:22px 0 30px}.stat{border:1px solid var(--line);border-radius:12px;background:white;padding:20px 23px}.stat-label{font-size:12px;color:var(--muted)}.stat-num{font-size:29px;font-weight:600;letter-spacing:-1px;margin:4px 0}.stat-num small{font-size:13px;color:#969f92;font-weight:400;letter-spacing:0}.stat-foot{font-size:11px;color:#8b9587}.bar{height:4px;background:#edf0e7;border-radius:10px;margin:10px 0}.bar i{display:block;height:100%;background:#7b9c64;border-radius:10px}.section-title{display:flex;justify-content:space-between;align-items:center;margin-bottom:15px}.section-title a{font-size:12px;color:var(--muted)}.home-grid{display:grid;grid-template-columns:1.55fr 1fr;gap:22px}.panel{background:#fff;border:1px solid var(--line);border-radius:12px;padding:24px}.course{display:flex;align-items:center;gap:17px;padding:19px 0;border-top:1px solid #eff1eb}.course:first-of-type{border:0}.course-icon{display:grid;place-items:center;flex-shrink:0;width:47px;height:47px;border-radius:10px;background:#edf3e4;font-size:22px}.course small{color:var(--muted);font-size:11px}.course strong{font-size:14px;display:block}.course .arrow{margin-left:auto;color:#879d7c}.note{border-radius:10px;background:#f5f6ef;padding:18px;font-size:12px;color:#6e796a;margin-top:18px}.note b{display:block;color:#465c43;margin-bottom:5px}.filterbar{display:flex;gap:10px;flex-wrap:wrap;margin:22px 0}.search{background:#fff;border:1px solid var(--line);border-radius:8px;padding:11px 14px;min-width:200px;flex:1;color:var(--ink)}select{background:white;border:1px solid var(--line);padding:9px 14px;border-radius:8px;color:var(--ink)}.chips{display:flex;gap:8px;margin-bottom:21px;flex-wrap:wrap}.chip{padding:7px 15px;border:1px solid var(--line);border-radius:20px;background:white;color:var(--muted);font-size:12px}.chip.active{background:var(--ink);border-color:var(--ink);color:white}.question-row{display:flex;gap:18px;align-items:center;background:#fff;border:1px solid var(--line);border-radius:10px;padding:20px 23px;margin-bottom:12px;transition:transform .15s,border-color .15s}.question-row:hover{border-color:#90ae7e;transform:translateY(-2px)}.qnum{font-family:Georgia,serif;font-size:24px;color:#8d9f80;min-width:34px}.question-row h3{font-size:14px;margin:5px 0}.question-row p{font-size:11px;color:var(--muted)}.tag{display:inline-flex;font-size:10px;padding:2px 8px;border-radius:4px;background:#f0f3e9;color:#6b8058}.badge{font-size:11px;white-space:nowrap;margin-left:auto;color:#8c9786}.badge.correct{color:var(--green)}.badge.wrong{color:var(--red)}.crumb{font-size:12px;color:var(--muted);margin-bottom:20px}.study-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:22px}.study-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:24px;align-items:start}.question-card{padding:30px}.question-card h2{font-size:21px;line-height:1.75;margin:22px 0}.source{font-size:10px;color:#8e998b;margin-top:18px}.options{display:grid;gap:10px;margin:23px 0}.option{display:flex;gap:13px;align-items:center;text-align:left;background:#fff;border:1px solid #e1e6dc;border-radius:8px;padding:14px 15px;color:#465342;line-height:1.6;font-size:13px}.option .circle{border:1px solid #dce3d7;border-radius:50%;width:25px;height:25px;display:grid;place-items:center;flex-shrink:0;font-size:11px}.option.selected{border-color:#477855;background:#f1f6eb}.option.selected .circle{background:var(--green);color:white;border-color:var(--green)}.option.good{border-color:#579369;background:#f0f7ee;opacity:1}.option.bad{border-color:#d49d95;background:#fff3f1;opacity:1}.submit-row{display:flex;justify-content:space-between;align-items:center;gap:12px}.submit-row small{color:var(--muted);font-size:11px}.lock-panel{min-height:365px;text-align:center;display:flex;flex-direction:column;align-items:center;justify-content:center;background:#f0f3e9;border-style:dashed}.lock-icon{font-size:28px;margin-bottom:18px;color:#83936f}.lock-panel h3{margin-bottom:10px}.lock-panel p{font-size:13px;max-width:230px;color:#87907e}.result{padding:12px 15px;background:#edf4e8;border-radius:8px;font-size:13px;margin-bottom:22px}.result.wrong{background:#fff1ec;color:#a34c3f}.explain{font-size:14px;line-height:1.9;color:#4d5a47}.explain h3{color:var(--ink);margin:22px 0 10px}.explain img{max-width:100%;border-radius:6px;border:1px solid var(--line);margin-top:12px}.original-link{color:var(--green);font-size:12px;border:0;background:#eef4e7;padding:9px 12px;border-radius:6px;margin-top:15px}.study-nav{display:flex;justify-content:space-between;align-items:center;margin-top:22px}.empty{padding:65px 20px;text-align:center}.empty p{color:var(--muted);margin:15px}.plans{display:grid;grid-template-columns:1fr 1fr;gap:24px;max-width:850px;margin:32px auto}.price{font-size:33px;font-weight:600;margin:25px 0 5px}.plan ul{padding:0;list-style:none;font-size:13px;line-height:2.4;margin:25px 0}.plan ul li:before{content:'✓';color:#7d995b;margin-right:12px}.plan.featured{border:2px solid #63835b;position:relative}.plan.featured:before{content:'출시 구성 예시';position:absolute;right:20px;top:-13px;background:#63835b;color:#fff;padding:2px 13px;border-radius:12px;font-size:11px}.admin-table{width:100%;border-collapse:collapse;font-size:13px}.admin-table th,.admin-table td{text-align:left;padding:15px 10px;border-bottom:1px solid var(--line)}.admin-table th{font-size:11px;color:var(--muted)}.admin-table button{padding:5px 12px;border:1px solid var(--line);background:#fff;border-radius:6px;color:var(--green)}label{display:block;font-size:12px;margin:15px 0 6px}textarea,.field{width:100%;border:1px solid var(--line);border-radius:7px;padding:11px;color:var(--ink);background:#fff}textarea{min-height:100px;resize:vertical}.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}.form-actions{display:flex;gap:10px;margin-top:20px}footer{border-top:1px solid var(--line);padding:18px 42px;font-size:9px;letter-spacing:.6px;color:#97a08e;display:flex;justify-content:space-between}#toast{position:fixed;bottom:30px;left:50%;transform:translateX(-50%) translateY(100px);padding:12px 24px;border-radius:10px;background:#193f35;color:white;font-size:13px;z-index:100;opacity:0;transition:.2s;max-width:90vw}#toast.show{transform:translateX(-50%) translateY(0);opacity:1}dialog{border:1px solid var(--line);border-radius:15px;padding:32px;max-width:760px;width:90vw;max-height:88vh;color:var(--ink)}dialog::backdrop{background:#142d2766;backdrop-filter:blur(3px)}dialog img{width:100%}.close{position:absolute;right:13px;top:8px;border:0;background:none;font-size:26px;color:var(--muted)}.original{font-size:11px;color:var(--muted)}.focus .sidebar,.focus header,.focus footer{display:none}.focus .shell{margin-left:0}.focus main{max-width:1200px}.small-heading{font-size:12px;color:var(--muted);margin-bottom:12px}
@media(min-width:1450px){main{padding-top:45px}.hero{min-height:265px}.hero-art{margin-right:40px}}@media(max-width:1100px){.sidebar{width:205px;padding-left:16px;padding-right:16px}.shell{margin-left:205px}main{padding:25px}header{padding:0 25px}.hero-art{width:180px}.hero{padding:27px}.home-grid{grid-template-columns:1fr}.study-grid{grid-template-columns:1fr}.lock-panel{min-height:180px}.header-label{display:none}}@media(max-width:700px){.sidebar{position:static;width:100%;height:auto;padding:15px 18px;display:block}.brand{font-size:8px;gap:9px}.brandmark{font-size:35px}.brand b{font-size:12px}.edition,.side-bottom{display:none}nav{display:flex;margin-top:17px;gap:4px}nav a{padding:8px 10px;flex:1;justify-content:center;gap:5px;font-size:13px}nav a span{font-size:11px}nav small{display:none}.shell{margin:0}header{height:55px;padding:0 20px}.header-name{font-size:11px}.header-right{gap:12px;font-size:11px}main{padding:24px 18px}.page-top{align-items:flex-start}.page-top>.btn{padding:8px 10px;font-size:11px}h1{font-size:25px}.hero{padding:25px;min-height:220px}.hero h2{font-size:24px}.hero-art{width:100px;margin-left:12px}.book{width:90px;height:132px;padding:15px}.book b{font-size:17px}.book span{font-size:6px}.book i{font-size:26px}.orbit{width:140px;height:140px}.stats{gap:8px}.stat{padding:15px 12px}.stat-label{font-size:10px}.stat-num{font-size:24px}.stat-foot{font-size:9px}.panel{padding:20px}.plans{grid-template-columns:1fr}.question-row{padding:15px;gap:10px}.question-row h3{font-size:12px}.question-row .badge{font-size:10px}.qnum{font-size:20px;min-width:25px}.study-top{gap:12px;align-items:flex-start}.study-top .btn{padding:8px 10px;font-size:11px}.question-card h2{font-size:18px}.form-grid{grid-template-columns:1fr}.admin-table th:nth-child(3),.admin-table td:nth-child(3){display:none}footer{padding:18px;display:block;line-height:2}footer span{display:block}.header-label{display:none}}
/* Library and editor extensions */
nav{overflow:auto;min-height:0}nav a{font-size:14px;gap:11px}.nav-icon{font-size:18px;min-width:20px;text-align:center}.sidebar .side-bottom{flex-shrink:0}.home-section{margin-top:31px}.home-section .section-title{margin-bottom:17px}.book-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;margin-bottom:25px}.book-card{display:flex;flex-direction:column;overflow:hidden;background:#fff;border:1px solid var(--line);border-radius:13px;transition:transform .18s,border-color .18s}.book-card:hover{transform:translateY(-3px);border-color:#95aa8a}.book-cover{height:180px;padding:22px 24px;background:var(--book-color,#315847);color:#fff;position:relative;display:flex;flex-direction:column;justify-content:space-between}.book-cover:after{content:'';position:absolute;right:-32px;top:-42px;width:150px;height:150px;border:1px solid #ffffff44;border-radius:50%}.book-cover span{font-size:9px;letter-spacing:2px;color:#ffffffcc}.book-cover strong{font-size:22px;line-height:1.25;letter-spacing:-.6px;max-width:80%}.book-cover i{position:absolute;right:28px;bottom:10px;font-style:normal;font-size:39px;color:#ffffffaa}.book-info{padding:21px;display:flex;flex-direction:column;flex:1}.book-info h3{font-size:18px;margin:5px 0}.book-info p{font-size:12px;color:var(--muted);min-height:44px}.book-meta{border-top:1px solid var(--line);margin-top:auto;padding-top:14px;font-size:11px;color:#6e7c6e;display:flex;justify-content:space-between;gap:8px}.intro-panel{padding:28px 32px;margin-top:26px}.intro-panel h2{font-size:23px;margin:10px 0}.intro-panel p{font-size:13px;color:var(--muted);margin-bottom:18px}.book-banner{background:var(--book-color,#315847);border-radius:13px;padding:36px;color:white;display:flex;justify-content:space-between;align-items:center;min-height:235px;overflow:hidden}.book-banner .eyebrow{color:#e1eed7}.book-banner h2{font-size:29px;margin:11px 0}.book-banner p{color:#ffffffcc;font-size:13px}.book-banner-actions{margin-top:24px}.mini-cover{border:1px solid #ffffff66;box-shadow:15px 15px 0 #0000001f;transform:rotate(10deg);width:150px;height:176px;border-radius:4px 9px 9px 4px;display:flex;align-items:center;justify-content:center;padding:18px;text-align:center;font-size:20px;font-weight:700;line-height:1.3;background:#f0f1d8;color:var(--book-color,#315847)}.admin-tabs{display:flex;gap:7px;flex-wrap:wrap;margin:0 0 23px;border-bottom:1px solid var(--line)}.admin-tabs a{font-size:13px;color:#788379;padding:11px 17px;border-bottom:2px solid transparent}.admin-tabs a.active{border-color:var(--green);color:var(--green);font-weight:700}.admin-actions{display:flex;gap:10px;flex-wrap:wrap;margin:0 0 21px}.admin-row{display:flex;align-items:center;justify-content:space-between;gap:15px;padding:15px 4px;border-bottom:1px solid var(--line)}.admin-row:last-child{border-bottom:0}.admin-row strong{font-size:13px}.admin-row small{display:block;font-size:11px;color:var(--muted)}.inline-actions{display:flex;gap:6px;align-items:center;flex-wrap:wrap}.inline-actions button,.small-btn{padding:5px 10px;background:#f8f9f4;border:1px solid var(--line);border-radius:6px;font-size:11px;color:var(--green)}.inline-actions button:hover,.small-btn:hover{background:#edf3e8}.inline-actions button:disabled{opacity:.3}.book-admin-card{display:grid;grid-template-columns:35px 1fr;gap:14px;padding:18px;border:1px solid var(--line);background:#fff;border-radius:12px}.book-admin-card h3{font-size:14px;margin:3px 0}.book-admin-card p{font-size:11px;color:var(--muted);min-height:48px}.book-admin-card .book-meta{border:0;margin-bottom:12px;padding:0}.book-swatch{width:32px;height:44px;border-radius:3px}.home-admin-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:21px;align-items:start}.home-admin-grid textarea{min-height:68px}.form-panel{max-width:720px}.color-input{border:0;width:100%;height:42px;background:transparent;padding:0}.checkline{display:flex;align-items:center;gap:8px;margin:19px 0}.checkline input{accent-color:var(--green)}.custom-page{max-width:920px;font-size:15px;line-height:1.9;padding:35px}.custom-page p{white-space:pre-wrap;margin-bottom:22px}.long-text{min-height:260px}.admin-table-wrap{overflow-x:auto}.explain p,.question-card h2{white-space:pre-wrap}.question-row{min-width:0}.book-card,.admin-row{min-width:0}
@media(max-width:1100px){.book-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.home-admin-grid{grid-template-columns:1fr}}
@media(max-width:700px){.book-grid{grid-template-columns:1fr}.book-cover{height:152px}.book-banner{padding:27px;min-height:195px}.book-banner h2{font-size:23px}.mini-cover{width:90px;height:117px;font-size:13px;flex-shrink:0}.admin-tabs{flex-wrap:nowrap;overflow-x:auto;white-space:nowrap}.admin-tabs a{font-size:12px;padding:10px}.admin-row{align-items:flex-start;flex-direction:column}.inline-actions{width:100%}.book-admin-card{grid-template-columns:25px 1fr}.sidebar{max-height:200px}.sidebar nav{overflow-x:auto;white-space:nowrap;max-height:110px}.sidebar nav a{flex:0 0 auto}.sidebar nav a span:last-child{font-size:11px}.page-top{flex-wrap:wrap}.book-banner-actions .btn{padding:8px 11px}.header-right a{display:none}}

@media(max-width:700px){.sidebar .side-bottom{display:block;margin:0}.sidebar .trial,.sidebar .profile{display:none}.sidebar .admin-link{padding:6px 12px}.header-right a{display:inline-flex}.sidebar{max-height:none}}

/* Shared theme: each visible surface follows the selected palette. */
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--ink);font-family:var(--body-font);font-size:calc(14px * var(--font-scale))}
button,input,textarea,select{font-family:inherit}
button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid var(--green);outline-offset:3px}
input[type=checkbox],input[type=range]{accent-color:var(--green)}
button:disabled{cursor:default}
h1{font-size:calc(30px * var(--font-scale))}
h2{font-size:calc(20px * var(--font-scale))}
p{overflow-wrap:anywhere}
.sidebar{background:var(--sidebar-bg);color:var(--sidebar-text);height:100dvh;overflow:auto}
.brand{gap:12px;min-width:0;color:var(--sidebar-text)}
.brand>span:last-child{min-width:0}
.brand small{display:block;font-size:8px;letter-spacing:1.8px;margin-bottom:7px;opacity:.7}
.brand b{font-size:15px;letter-spacing:.6px;display:block;overflow-wrap:anywhere;line-height:1.45}
.brandmark{color:var(--green);font-size:48px;letter-spacing:-3px;flex-shrink:0}
.brand-image{width:44px;height:48px;object-fit:contain;flex-shrink:0}
.edition{color:var(--sidebar-text);opacity:.58;letter-spacing:1px}
nav a{color:var(--sidebar-text);border:1px solid transparent;font-size:14px}
nav a:hover{background:var(--soft);color:var(--ink)}
nav a.active{background:var(--soft);border-color:var(--line);color:var(--green)}
nav a span:last-child{font-size:calc(13px * var(--font-scale))}
.trial{background:var(--soft);border-color:var(--line);border-radius:var(--radius);color:var(--ink)}
.tiny,.trial p{color:var(--muted)}
.trial a{color:var(--green)}
.profile{margin-top:20px;border-color:var(--line)}
.avatar{background:var(--soft);color:var(--green)}
.profile small{color:var(--muted)}
.shell>header{background:var(--header-bg)}
.header-label,.header-name{color:var(--muted)}
.header-name{color:var(--ink)}
.demo-pill{background:var(--soft);border-color:var(--line);color:var(--green)}
.customize-link{color:var(--green);font-weight:600;white-space:nowrap}
main{max-width:var(--content-width);padding:34px 38px 56px}
.page-top p{color:var(--muted);font-size:calc(13px * var(--font-scale))}
.eyebrow{color:var(--green)}
.muted,.original,.small-heading,.source,.crumb{color:var(--muted)}
.btn{background:var(--surface);border-color:var(--line);color:var(--ink);border-radius:calc(var(--radius) * .65);font-size:calc(13px * var(--font-scale));gap:10px}
.btn:hover{border-color:var(--green)}
.btn.primary{background:var(--green);border-color:var(--green);color:var(--primary-text)}
.btn.light{background:var(--lime);color:var(--accent-text);border-color:var(--lime)}
.btn.ghost{background:transparent}
.hero{background:var(--hero-bg);color:var(--hero-text);border-radius:var(--radius);min-height:var(--hero-height);align-items:center}
.hero h2{font-size:calc(31px * var(--font-scale));color:inherit}
.hero p{color:inherit;opacity:.8;font-size:calc(13px * var(--font-scale))}
.hero .eyebrow{color:inherit;opacity:.7}
.hero-copy{position:relative;z-index:1}
.hero-buttons{display:flex;gap:12px;flex-wrap:wrap}
.hero-secondary{background:transparent;border-color:currentColor;color:var(--hero-text)}
.hero-art{flex-shrink:0}
.hero-art.custom-art{width:38%;max-width:400px;margin-left:24px}
.hero-art.custom-art img{width:100%;max-height:340px;object-fit:contain;border-radius:calc(var(--radius) * .7)}
.hero.align-center{text-align:center;justify-content:center;flex-direction:column;gap:30px}
.hero.align-center .hero-buttons{justify-content:center}
.hero.align-center .hero-art{margin:0}
.hero.align-center .hero-art:not(.custom-art){display:none}
.hero .book{background:var(--lime);color:var(--accent-text);box-shadow:15px 15px 0 #0002,inset 8px 0 0 #0001}
.hero .book b{font-size:22px}
.hero .book span{display:block;line-height:1.4;letter-spacing:1px}
.hero .orbit{border-color:currentColor;color:var(--hero-text);opacity:.2}
.home-section,.intro-panel,.custom-section{margin-top:var(--space)}
.book-grid{grid-template-columns:repeat(var(--book-columns),minmax(0,1fr));gap:18px}
.book-card{background:var(--surface);border-radius:var(--radius);color:var(--ink)}
.book-card:hover{border-color:var(--green)}
.book-cover{height:190px}
.book-cover.has-image{padding:0;background:var(--soft)}
.book-cover.has-image:after{display:none}
.book-cover img{width:100%;height:100%;object-fit:contain}
.book-info h3{font-size:calc(17px * var(--font-scale))}
.book-info p{font-size:calc(12px * var(--font-scale))}
.book-meta{color:var(--muted);font-size:calc(11px * var(--font-scale))}
.text-link{font-size:12px;color:var(--muted)}
.panel,.stat,.book-admin-card,.question-row{background:var(--surface);border-color:var(--line);border-radius:var(--radius)}
.stats{gap:16px}
.stat-label{color:var(--muted);font-size:calc(12px * var(--font-scale))}
.stat-num small,.stat-foot{color:var(--muted)}
.bar{background:var(--soft-strong)}
.bar i{background:var(--green)}
.note{background:var(--soft);color:var(--muted);border-radius:calc(var(--radius) * .7)}
.note b{color:var(--ink)}
.course{border-color:var(--line)}
.course-icon{background:var(--soft)}
.course .arrow{color:var(--green)}
.tag{color:var(--green);background:var(--soft)}
.badge,.qnum{color:var(--muted)}
.search,select,textarea,.field{background:var(--surface);border-color:var(--line);color:var(--ink);border-radius:calc(var(--radius) * .5)}
textarea{line-height:1.65}
.chip{background:var(--surface);color:var(--muted)}
.chip.active{background:var(--green);color:var(--primary-text);border-color:var(--green)}
.option{background:var(--surface);border-color:var(--line);color:var(--ink)}
.option .circle{border-color:var(--line)}
.option.selected,.option.good{border-color:var(--green);background:var(--soft);color:var(--ink)}
.option.selected .circle{color:var(--primary-text)}
.option.bad{background:#fff3f1;color:#7d3228}
.lock-panel{background:var(--soft)}
.lock-panel p,.lock-icon{color:var(--muted)}
.result{background:var(--soft);color:var(--ink)}
.result.wrong{background:#fff1ec;color:#8c3d33}
.explain{color:var(--ink)}
.original-link{background:var(--soft);color:var(--green)}
.book-banner{border-radius:var(--radius)}
.book-banner .mini-cover img{max-width:100%;max-height:100%;object-fit:contain}
.plans{grid-template-columns:repeat(auto-fit,minmax(260px,1fr));max-width:1100px}
.plan.featured{border-color:var(--green)}
.plan.featured:before{display:none}
.plan ul li:before{color:var(--green)}
.price{font-size:calc(32px * var(--font-scale))}
.custom-section{padding:32px}
.custom-section h2{margin:9px 0 12px;font-size:calc(25px * var(--font-scale));color:inherit}
.custom-section p{margin:12px 0 20px;font-size:calc(14px * var(--font-scale));white-space:normal;color:inherit;opacity:.85}
.custom-section .eyebrow{color:inherit;opacity:.6}
.custom-section.align-center{text-align:center}
.section-notice{border-left:4px solid var(--green)}
.section-image{display:grid;grid-template-columns:1fr 1fr;align-items:center;gap:28px}
img.section-image{display:block;width:100%;max-height:360px;object-fit:contain;border-radius:calc(var(--radius) * .7)}
.section-text>img,.section-notice>img{margin-bottom:24px;max-height:300px}
.section-image:not(:has(>img)){display:block}
footer{color:var(--muted);letter-spacing:0}
#toast{background:var(--ink);color:var(--bg);box-shadow:0 8px 30px #0002}
dialog{background:var(--surface);color:var(--ink)}
.admin-tabs{gap:2px;margin-bottom:25px;flex-wrap:wrap}
.admin-tabs a{color:var(--muted);padding:11px 13px}
.admin-tabs a.active{color:var(--green);border-color:var(--green)}
.admin-tabs a:hover{background:var(--soft)}
.inline-actions button,.small-btn,.admin-table button{background:var(--soft);color:var(--green);border-color:var(--line)}
.inline-actions button:hover,.small-btn:hover{background:var(--soft-strong)}
.admin-table th{color:var(--muted)}
.book-swatch{height:48px;overflow:hidden}
.book-swatch img{width:100%;height:100%;object-fit:cover}
.cover-preview img{height:170px;max-width:100%;object-fit:contain;margin:16px 0}
.menu-row-label{display:flex;align-items:center;gap:14px;min-width:0}
.menu-row-label small{overflow-wrap:anywhere}
.menu-preview-icon{background:var(--soft);color:var(--green);width:38px;height:38px;flex-shrink:0;display:grid;place-items:center;border-radius:8px;font-size:20px}
/* Editing workspace */
.studio-heading{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-bottom:24px}
.studio-heading h1{margin:8px 0;font-size:28px}
.studio-heading p{font-size:13px}
.studio-actions{flex-shrink:0;text-align:right}
.studio-actions>div{display:flex;gap:8px}
.save-status{display:block;font-size:11px;color:var(--green);margin-bottom:10px}
.studio-actions .btn{padding:9px 13px;font-size:12px}
.studio-grid{display:grid;grid-template-columns:minmax(320px,1fr) minmax(340px,1.05fr);gap:24px;align-items:start}
.editor-column{min-width:0}
.editor-group{border:1px solid var(--line);background:var(--surface);border-radius:12px;margin-bottom:14px;overflow:hidden}
.editor-group>summary{cursor:pointer;display:flex;justify-content:space-between;gap:14px;align-items:center;padding:19px 20px;font-size:14px;font-weight:650;list-style:none;user-select:none}
.editor-group>summary::-webkit-details-marker{display:none}
.editor-group>summary small{font-size:11px;color:var(--muted);font-weight:400;display:block;margin-top:4px}
.disclosure-arrow{color:var(--muted);transition:transform .2s;font-size:18px}
.editor-group[open] .disclosure-arrow{transform:rotate(180deg)}
.editor-group-body{padding:2px 20px 22px;border-top:1px solid var(--line)}
.editor-group-body>div:first-child>label{margin-top:15px}
.editor-group-body textarea{min-height:80px}
.control-field{min-width:0}
.control-field label,.image-field>label,.color-control label{font-size:12px;color:var(--ink);margin-top:17px}
.control-field .field,.control-field textarea{font-size:13px}
.field-help{display:block;font-size:11px;line-height:1.7;color:var(--muted);margin-top:7px}
.checkline{font-size:12px;line-height:1.5}
.checkline input{width:16px;height:16px;flex-shrink:0}
.range-field{display:flex;gap:16px;align-items:center;padding:8px 0}
.range-field input{width:100%}
.range-field output{min-width:48px;text-align:right;font-size:12px;font-variant-numeric:tabular-nums;color:var(--muted)}
.image-upload{display:flex;gap:18px;align-items:center;border:1px dashed var(--line);border-radius:9px;padding:16px;background:var(--bg)}
.image-upload img,.image-placeholder{width:76px;height:70px;object-fit:contain;background:var(--surface);border-radius:6px}
.image-placeholder{display:grid;place-items:center;font-size:28px;color:var(--muted)}
.upload-label{margin:0;cursor:pointer;display:inline-flex}
.text-button{background:none;color:var(--muted);border:0;text-decoration:underline;padding:0;font-size:11px}
.section-list{padding-top:5px}
.section-item{display:flex;gap:10px;align-items:center;flex-wrap:wrap;padding:16px 0;border-bottom:1px solid var(--line)}
.section-item:last-child{border-bottom:0}
.section-number{font-size:10px;color:var(--muted);width:20px}
.section-item-name{flex:1;min-width:100px}
.section-item-name strong{font-size:12px;font-weight:600}
.section-item-name small{display:block;font-size:10px;color:var(--muted)}
.section-item.is-hidden .section-item-name{opacity:.5}
.section-item .inline-actions{gap:4px;justify-content:flex-end}
.section-item .inline-actions button,.section-item .small-btn{font-size:10px;padding:4px 8px}
.add-section-row{display:flex;gap:9px;margin-top:17px}
.add-section-row .field{min-width:0;flex:1;font-size:12px}
.add-section-row .btn{white-space:nowrap;font-size:11px;padding:8px 11px}
.book-checks{padding-top:5px}
.book-checks .checkline{margin:12px 0}
.optional-color{display:flex;align-items:center;gap:9px}
.optional-color input{width:45px;height:36px;padding:2px;background:var(--surface);border:1px solid var(--line);border-radius:6px}
.preset-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:18px}
.theme-preset{padding:13px 12px;border:1px solid var(--line);border-radius:9px;background:var(--surface);text-align:left;color:var(--ink)}
.theme-preset:hover{border-color:var(--green);background:var(--soft)}
.preset-colors{display:flex;margin-bottom:12px}
.preset-colors i{width:22px;height:22px;border-radius:50%;border:2px solid var(--surface);margin-right:-4px;box-shadow:0 0 0 1px #0001}
.theme-preset strong{display:block;font-size:12px}
.theme-preset small{display:block;font-size:10px;color:var(--muted);margin-top:3px}
.color-grid{display:grid;grid-template-columns:1fr 1fr;gap:0 18px}
.color-control>div{display:flex;border:1px solid var(--line);border-radius:7px;align-items:center;padding:5px 7px;gap:9px;min-width:0}
.color-control input[type=color]{width:30px;height:28px;padding:0;border:0;background:none;flex-shrink:0}
.hex-field{width:100%;min-width:0;border:0;background:transparent;color:var(--ink);font-family:ui-monospace,monospace;font-size:12px;padding:3px 0}
.hex-field[aria-invalid=true]{color:#b44942;outline-color:#b44942}
.contrast-info{margin-top:18px;border-radius:8px;padding:12px;background:var(--soft);color:var(--muted);font-size:11px;line-height:1.6}
.live-preview{position:sticky;top:20px;min-width:0;border:1px solid var(--line);border-radius:14px;background:var(--surface);overflow:hidden;box-shadow:0 8px 24px #00000006}
.preview-toolbar{padding:17px 18px;display:flex;align-items:center;justify-content:space-between;gap:10px;border-bottom:1px solid var(--line)}
.preview-toolbar strong{font-size:12px}
.preview-toolbar small{display:block;font-size:10px;color:var(--muted);margin-top:3px}
.device-switch{display:flex;border:1px solid var(--line);border-radius:7px;padding:3px;flex-shrink:0}
.device-switch button{border:0;background:transparent;color:var(--muted);padding:5px 8px;border-radius:4px;font-size:10px}
.device-switch button.active{background:var(--soft);color:var(--green)}
.preview-window{height:560px;overflow:auto;background:var(--soft);padding:12px;scrollbar-width:thin}
.preview-scaler{position:relative;margin:auto;flex-shrink:0}
#live-frame{position:absolute;left:0;top:0;transform-origin:top left;border:0;background:var(--bg);border-radius:0}
.preview-open{display:block;padding:14px;text-align:center;font-size:11px;color:var(--green);border-top:1px solid var(--line)}
.copy-grid,.backup-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px}
.editor-section-heading{font-size:16px;margin-bottom:14px}
.copy-grid .btn{margin-bottom:20px}
.backup-icon{font-size:26px;color:var(--green);width:50px;height:50px;display:grid;place-items:center;background:var(--soft);border-radius:12px;margin-bottom:18px}
.backup-grid .panel{padding:28px}
.backup-grid p{color:var(--muted);font-size:13px;line-height:1.8;margin:13px 0 23px}
.backup-grid p.field-help{font-size:11px;margin:15px 0 0}
.backup-grid h2{font-size:18px}
/* Horizontal navigation is also selectable in the editor. */
body[data-nav=top] .sidebar{position:static;width:100%;height:auto;padding:20px 36px;display:grid;grid-template-columns:auto 1fr;align-items:center;gap:10px 32px;border-right:0;border-bottom:1px solid var(--line)}
body[data-nav=top] .brand{max-width:250px}
body[data-nav=top] .edition,body[data-nav=top] .side-bottom{display:none}
body[data-nav=top] #mainnav{display:flex;justify-content:flex-end;flex-wrap:wrap;overflow:visible;margin:0}
body[data-nav=top] #mainnav a{padding:9px 12px;white-space:nowrap}
body[data-nav=top] .shell{margin-left:0}
body.focus .sidebar,body.focus header,body.focus footer{display:none}
body.focus .shell{margin-left:0}
@media(max-width:1250px){
  .studio-grid{grid-template-columns:minmax(300px,1fr) minmax(290px,.9fr);gap:18px}
  .preview-toolbar{flex-wrap:wrap}
  .studio-heading{align-items:flex-start}
  .studio-heading h1{font-size:25px}
  .studio-actions>div{flex-wrap:wrap;justify-content:flex-end}
  .section-item .inline-actions{margin-left:30px;justify-content:flex-start}
}
@media(max-width:1100px){
  main{padding:28px 25px 45px}
  .book-grid{grid-template-columns:repeat(min(2,var(--book-columns)),minmax(0,1fr))}
  .studio-grid{grid-template-columns:1fr}
  .live-preview{position:relative;top:0;order:-1}
  .preview-window{height:330px}
  .editor-column{display:block}
  .preset-grid{grid-template-columns:repeat(3,1fr)}
  .copy-grid{grid-template-columns:1fr}
  .section-item .inline-actions{margin-left:0}
  .hero-art.custom-art{width:33%}
}
@media(max-width:700px){
  .sidebar{height:auto;position:static;overflow:visible;padding:17px 18px 12px}
  .brandmark{font-size:34px}
  .brand b{font-size:13px}
  .brand small{font-size:7px;margin-bottom:3px}
  .brand-image{width:33px;height:37px}
  .sidebar .side-bottom{display:none}
  #mainnav{overflow-x:auto;scrollbar-width:thin;flex-wrap:nowrap;margin-top:14px;gap:3px;padding-bottom:2px}
  #mainnav a{flex:0 0 auto;padding:8px 11px}
  #mainnav a span:last-child{font-size:12px}
  .nav-icon{font-size:15px;min-width:17px}
  .shell>header{padding:0 18px}
  .header-name{max-width:160px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;display:block}
  .header-right{gap:10px}
  .demo-pill{font-size:8px}
  .customize-link{font-size:11px}
  main{padding:24px 18px 40px}
  h1{font-size:calc(24px * var(--font-scale))}
  .hero{padding:25px;min-height:var(--hero-height)}
  .hero h2{font-size:calc(26px * var(--font-scale))}
  .hero p{font-size:calc(12px * var(--font-scale))}
  .hero-art{display:none}
  .hero-art.custom-art{display:block;width:100%;max-width:240px;margin:22px 0 0}
  .hero:has(.custom-art){flex-direction:column;align-items:flex-start}
  .hero.align-center:has(.custom-art){align-items:center}
  .hero-buttons .btn{padding:10px 14px;font-size:12px}
  .book-grid{grid-template-columns:1fr}
  .book-cover{height:200px}
  .book-cover strong{font-size:27px}
  .book-info{padding:22px}
  .stats{gap:8px}
  .stat{padding:16px 12px}
  .stat-num{font-size:24px}
  .stat-label{font-size:11px}
  .stat-foot{font-size:10px}
  .section-image{grid-template-columns:1fr}
  .custom-section{padding:24px}
  .studio-heading{display:block}
  .studio-heading h1{font-size:25px}
  .studio-actions{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-top:20px}
  .studio-actions>div{flex-wrap:nowrap}
  .save-status{font-size:9px;margin:0}
  .studio-actions .btn{font-size:10px;padding:9px 10px}
  .admin-tabs{flex-wrap:nowrap;overflow-x:auto;white-space:nowrap}
  .admin-tabs a{font-size:12px;padding:11px 12px}
  .editor-group>summary{padding:17px}
  .editor-group-body{padding:0 17px 20px}
  .preset-grid{gap:8px}
  .theme-preset{padding:12px 9px}
  .color-grid{gap:0 12px}
  .preview-window{height:300px}
  .preview-toolbar{padding:13px 15px;flex-wrap:nowrap}
  .preview-toolbar small{font-size:9px}
  .section-item{align-items:flex-start}
  .section-item .inline-actions{margin-left:30px;width:auto}
  .form-actions{flex-wrap:wrap}
  .backup-grid{grid-template-columns:1fr}
  .backup-grid .panel{padding:24px}
  .admin-row{flex-direction:column}
  .menu-row-label{width:100%}
  .book-admin-card{grid-template-columns:32px 1fr}
  .plans{grid-template-columns:1fr}
  body[data-nav=top] .sidebar{display:block;padding:17px 18px 12px}
  body[data-nav=top] #mainnav{display:flex;justify-content:flex-start;flex-wrap:nowrap;overflow-x:auto;margin-top:14px}
  body[data-nav=top] #mainnav a{padding:8px 11px}
}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}


/* Answer meanings remain legible under every custom site palette. */
.type-tag{display:inline-block;margin:0 6px;padding:2px 8px;border:1px solid var(--line);border-radius:5px;font-size:11px;color:var(--muted);vertical-align:middle}
.ox-options{grid-template-columns:1fr 1fr;gap:14px}
.ox-options .option{min-height:135px;flex-direction:column;justify-content:center;gap:3px;text-align:center;position:relative}
.ox-options .ox-symbol{font-size:46px;line-height:1.2;font-weight:600}
.ox-options .ox-label{font-size:13px}
.option-state{font-size:11px;min-height:18px;font-weight:700}
.ox-options .option.good{border-color:#246a42;background:#eff8f1;color:#185c36}
.ox-options .option.bad{border-color:#bd3c37;background:#fff0ee;color:#b32624}
.question-type-line{display:flex;gap:8px;align-items:center;margin:18px 0;color:var(--muted);font-size:12px}
.question-type-line .type-tag{margin-left:0}
.explanation-correct{color:#165b34;background:#eff8f1;font-weight:700;border-radius:3px;box-decoration-break:clone;-webkit-box-decoration-break:clone}
.explanation-wrong{color:#c02929;background:#fff1ef;font-weight:700;border-radius:3px;box-decoration-break:clone;-webkit-box-decoration-break:clone}
.explanation-legend{display:flex;flex-wrap:wrap;gap:8px;font-size:11px;margin:16px 0}
.explanation-legend>span{padding:3px 9px}
.ox-verdict{padding:18px 20px;border-radius:10px;border-left:3px solid;margin-top:20px}
.ox-verdict.is-true{background:#eff8f1;color:#165b34;border-color:#286841}
.ox-verdict.is-false{background:#fff1ef;color:#c02929;border-color:#c02929}
.verdict-label{font-size:12px;letter-spacing:.02em;font-weight:800}
.ox-verdict p{font-weight:700;margin-bottom:0;line-height:1.8}
.explanation-body,.color-preview{white-space:pre-wrap;overflow-wrap:anywhere;line-height:1.95}
.explanation-body{margin:12px 0}
.explain .note .explanation-body{display:block;margin:8px 0 0}
.ox-editor{padding:28px;max-width:950px}
.format-note{padding:12px 16px;background:var(--soft);border-radius:8px;margin-top:16px;font-size:12px}
.ox-answer-guide{display:flex;gap:12px;margin:24px 0 6px}
.ox-answer-guide>span{display:flex;align-items:center;justify-content:center;gap:12px;border:1px solid var(--line);border-radius:8px;padding:10px 24px;font-size:24px;font-weight:700;flex:1}
.ox-answer-guide small{font-weight:400;font-size:12px;color:var(--muted)}
.answer-hint{font-size:12px;margin:10px 0 22px}
.color-field{margin-top:24px}
.color-field>label{font-size:15px}
.color-toolbar{display:flex;flex-wrap:wrap;gap:7px;background:var(--soft);padding:10px;border:1px solid var(--line);border-bottom:0;border-radius:9px 9px 0 0}
.color-tool{padding:7px 10px;border:1px solid var(--line);border-radius:6px;background:var(--surface);color:var(--ink);font-size:12px;min-height:36px}
.color-tool.tone-wrong{background:#fff1ef;color:#c02929;border-color:#e9b7b0;font-weight:600}
.color-tool.tone-correct{background:#eff8f1;color:#165b34;border-color:#b3cdb8;font-weight:600}
.color-field textarea{border-radius:0 0 9px 9px!important;min-height:145px;margin-top:0;resize:vertical}
.color-preview-label{font-size:10px;color:var(--muted);letter-spacing:.05em;margin:12px 0 6px}
.color-preview{border:1px dashed var(--line);padding:16px 18px;border-radius:8px;min-height:65px}
.color-status{min-height:20px;font-size:11px;color:var(--muted);margin-top:5px}
.extra-explanation{border-top:1px solid var(--line);padding:20px 0;margin-top:22px}
.extra-explanation summary{cursor:pointer;font-weight:600}
.sample-strip{display:flex;justify-content:space-between;align-items:center;gap:10px;flex-wrap:wrap;margin:14px 0;font-size:12px;color:var(--muted)}
#content-book{margin-bottom:18px;max-width:400px}
.study-top>div:last-child{display:flex;flex-wrap:wrap;justify-content:flex-end;gap:8px}
.study-top .btn{font-size:12px}
.content-view-tabs{display:flex;gap:8px;flex-wrap:wrap;margin:22px 0 18px}
.question-row-actions{display:flex;gap:7px;flex-wrap:wrap;align-items:center;min-width:155px}
.question-delete{color:#b32e2e!important;border-color:#e6bcbc!important;background:#fff3f2!important}
.question-delete:hover{background:#ffe6e3!important}
.seed-question-label{font-size:10px;color:var(--muted);flex-basis:100%}
.content-empty{text-align:center!important;padding:36px!important;color:var(--muted)}
.content-management-table td{vertical-align:middle}
@media(max-width:700px){
 .ox-editor{padding:18px}
 .color-toolbar{gap:6px;padding:8px}
 .color-tool{font-size:11px;padding:7px 8px}
 .ox-options .option{min-height:115px}
 .study-top{align-items:flex-start;gap:14px;flex-direction:column}
 .study-top>div:last-child{justify-content:flex-start}
 .ox-verdict{padding:15px}
}

/* A quiet, product-led edition. Theme controls still drive every main surface. */
.object-cover strong,.apple-book-card h3{word-break:keep-all}
.apple-section{padding-block:calc(var(--space) * 2.5)!important}
body{letter-spacing:-.025em;-webkit-font-smoothing:antialiased}
body[data-nav=top] .sidebar{position:sticky;top:0;z-index:40;min-height:58px;padding:10px max(28px,calc((100vw - 1180px)/2));gap:20px;backdrop-filter:blur(20px);background:color-mix(in srgb,var(--sidebar-bg) 90%,transparent);overflow:visible}
body[data-nav=top] .brand{gap:10px;max-width:230px}
body[data-nav=top] .brandmark{font-size:35px;line-height:32px;color:var(--sidebar-text)}
body[data-nav=top] .brand b{font-size:12px;letter-spacing:1px;white-space:nowrap}
body[data-nav=top] .brand small:empty{display:none}
body[data-nav=top] #mainnav{gap:9px;flex-wrap:wrap}
body[data-nav=top] #mainnav a{padding:5px 10px;border:0;margin:0;border-radius:8px;font-size:12px}
body[data-nav=top] #mainnav a span:first-child{display:none}
body[data-nav=top] #mainnav a span:last-child{display:inline;font-size:12px}
body[data-nav=top] #mainnav a.active{background:transparent;color:var(--green)}
.shell>header{height:44px;padding:0 max(28px,calc((100vw - 1180px)/2));font-size:11px;border-bottom:1px solid var(--line)}
.header-name,.customize-link,.header-right{font-size:11px;font-weight:400}.header-label:empty,.demo-pill:empty{display:none}
main{padding:52px 36px 80px}body[data-page=home] main{padding:0;max-width:none}
h1{font-size:calc(44px * var(--font-scale));line-height:1.25;font-weight:700;letter-spacing:-.045em}
.page-top{margin-bottom:36px}.page-top p{font-size:16px;line-height:1.7;margin-top:12px}
.eyebrow{font-size:10px;letter-spacing:.15em;font-weight:600}.btn{border-radius:999px;padding:11px 21px;letter-spacing:-.02em;font-weight:500;transition:background .2s,transform .2s}
.btn:hover{transform:translateY(-1px)}.btn.primary:hover{filter:brightness(1.06)}
.apple-text-link{display:inline-flex;align-items:center;gap:5px;color:var(--green);font-size:14px;white-space:normal;line-height:1.5}
.apple-text-link:after{content:'›';font-size:21px;line-height:1}.apple-text-link:hover{text-decoration:underline}
.apple-hero{background:var(--hero-bg);color:var(--hero-text);min-height:calc(var(--hero-height) + 260px);padding:52px 24px 0;overflow:hidden;text-align:center;position:relative}
.apple-hero-copy{position:relative;z-index:2;max-width:780px;margin:0 auto}.apple-hero .eyebrow{color:inherit;opacity:.65;font-size:11px;letter-spacing:.2em}
.apple-hero h1{font-size:calc(64px * var(--font-scale));line-height:1.15;letter-spacing:-.055em;font-weight:750;margin:18px 0 18px}
.apple-hero p{font-size:calc(19px * var(--font-scale));line-height:1.6;opacity:.8;font-weight:400;margin:0}
.apple-hero-actions{display:flex;align-items:center;justify-content:center;gap:24px;margin-top:25px}.apple-hero-actions .btn{font-size:14px}
.apple-hero.align-left{text-align:left}.apple-hero.align-left .apple-hero-copy{max-width:1120px}.apple-hero.align-left .apple-hero-actions{justify-content:flex-start}
.apple-hero-image{max-width:1000px;margin:32px auto 0}.apple-hero-image img{display:block;max-width:100%;max-height:420px;object-fit:contain;margin:auto}
.apple-product-stage{height:330px;max-width:850px;position:relative;margin:40px auto 0;perspective:1200px}
.book-object{width:190px;height:248px;position:relative;flex-shrink:0;transform:rotateY(-14deg) rotateZ(-3deg);transform-style:preserve-3d;border-radius:2px 6px 6px 2px;box-shadow:0 24px 26px -10px #0003,0 1px 2px #0002;background:var(--cover-color);color:var(--cover-ink)}
.object-cover{position:absolute;inset:0;border-radius:inherit;background:linear-gradient(90deg,#0002,transparent 4%,#fff2 5%,transparent 8%),var(--cover-color);padding:20px 19px 18px 22px;display:flex;flex-direction:column;text-align:left;border:1px solid #0000000c;overflow:hidden}
.cover-publisher{font-size:7px;letter-spacing:.14em;opacity:.7}.object-cover strong{font-size:21px;line-height:1.25;letter-spacing:-.06em;margin-top:17px;font-weight:650;overflow-wrap:anywhere}
.cover-glyph{font-size:69px;font-weight:400;letter-spacing:-.08em;line-height:1;margin-top:auto;margin-bottom:12px}.cover-edition{font-size:7px;letter-spacing:.06em;opacity:.7}
.book-edge{position:absolute;inset:4px -8px 3px auto;width:9px;border-radius:0 3px 3px 0;background:repeating-linear-gradient(0deg,#d9d9d5 0px,#fafaf8 1px,#e8e8e4 2px);transform:rotateY(20deg);z-index:-1;border-right:2px solid var(--cover-color)}
.object-cover-image{width:100%;height:100%;object-fit:cover;border-radius:inherit}
.hero-volume{position:absolute;left:50%;top:14px;z-index:2}.volume-0{width:210px;height:276px;transform:translateX(-50%) rotateY(-9deg) rotateZ(-2deg);z-index:4;top:8px}.volume-0 .object-cover{padding:24px}.volume-0 .object-cover strong{font-size:25px}.volume-0 .cover-glyph{font-size:79px}
.volume-1{transform:translateX(-155%) rotateY(15deg) rotateZ(-11deg);top:41px}.volume-2{transform:translateX(52%) rotateY(-18deg) rotateZ(11deg);top:38px}
.product-ground{position:absolute;width:78%;height:40px;left:11%;bottom:5px;background:radial-gradient(ellipse,#00000014,transparent 68%);filter:blur(9px)}
.apple-section{max-width:var(--content-width);margin:0 auto;padding:80px 36px}.apple-section .section-title{margin-bottom:30px;gap:20px}.apple-section h2{font-size:calc(36px * var(--font-scale));line-height:1.3;letter-spacing:-.045em}.section-title .apple-text-link{color:var(--green);font-size:14px}
.book-grid{gap:22px}.apple-book-card{border:0;box-shadow:0 2px 7px #00000006;transition:transform .25s,box-shadow .25s;overflow:hidden}.apple-book-card:hover{transform:translateY(-5px);box-shadow:0 10px 30px #0000000b}
.apple-card-art{height:300px;background:color-mix(in srgb,var(--surface) 75%,var(--bg));display:flex;align-items:center;justify-content:center;padding-top:12px;perspective:900px}
.apple-card-art .book-object{width:158px;height:212px;transform:rotateY(-15deg) rotateZ(-4deg)}.apple-card-art .object-cover{padding:17px}.apple-card-art .object-cover strong{font-size:20px}.apple-card-art .cover-glyph{font-size:57px}.apple-card-art .cover-publisher,.apple-card-art .cover-edition{font-size:6px}
.apple-book-card .book-info{padding:25px 26px 28px}.apple-book-card .eyebrow{font-size:8px;letter-spacing:.09em;color:var(--muted);margin-bottom:8px}.apple-book-card h3{font-size:23px;line-height:1.3;letter-spacing:-.045em}.apple-book-card p{font-size:13px;line-height:1.8;color:var(--muted);min-height:46px;margin:13px 0 24px}
.apple-book-card .book-meta{padding-top:18px;border-top:1px solid var(--line);font-size:11px;display:flex;align-items:center;justify-content:space-between;gap:12px}.book-open{color:var(--green);white-space:nowrap}.book-open b{font-size:18px;margin-left:3px;font-weight:400}
.apple-intro{background:#101012;color:#f5f5f7;position:relative;overflow:hidden;text-align:center;padding:75px 24px 0;min-height:560px;margin:0 12px;border-radius:3px}
.apple-intro .eyebrow{color:#b6b6bd}.apple-intro h2{font-size:calc(48px * var(--font-scale));line-height:1.2;margin:22px 0 18px;letter-spacing:-.05em}.apple-intro p{font-size:17px;color:#a1a1a6;line-height:1.7;margin:0 0 24px}
.intro-symbols{display:flex;justify-content:center;gap:75px;font-size:190px;line-height:1;font-weight:550;letter-spacing:-.08em;margin:35px auto -25px;color:#f5f5f7}.intro-symbols span:first-child{color:#6fbb92}.intro-symbols span:last-child{color:#e77a79}
.progress-section .stats{margin:0;gap:22px}.stat{border:0;padding:30px}.stat-label{font-size:14px}.stat-num{font-size:43px;letter-spacing:-.05em;margin:14px 0}.stat-num small{font-size:14px}.bar{height:5px}.stat-foot{font-size:12px}
.panel{padding:28px;border-color:color-mix(in srgb,var(--line) 65%,transparent);box-shadow:0 2px 10px #00000003}.question-row{padding:24px;border:0}.question-row h3{font-size:16px}.question-row p{font-size:12px}.qnum{font-family:inherit;font-size:22px;color:var(--muted)}.question-row .tag{border-radius:5px}.question-card{padding:34px}.question-card h2{font-size:22px;line-height:1.7}.option{border-radius:12px}.lock-panel{border:0;min-height:380px}.study-top{margin-bottom:26px}
.book-banner{background:var(--surface)!important;color:var(--ink)!important;padding:42px;overflow:hidden;border:1px solid var(--line);min-height:300px;gap:38px}.book-banner h1{font-size:42px}.book-banner p{color:var(--muted)}.book-banner .eyebrow{color:var(--muted)}.book-banner .mini-cover{width:175px;height:230px;transform:none;padding:0;background:transparent;box-shadow:none;border:0;border-radius:0}.mini-cover .book-object{width:160px;height:215px}.mini-cover .object-cover strong{font-size:21px}.mini-cover .cover-glyph{font-size:61px}
.admin-tabs{gap:8px}.admin-tabs a{border-radius:999px;padding:9px 17px}.admin-table th{font-weight:500;color:var(--muted);font-size:11px}.admin-table td{padding:17px 12px}.admin-table th{padding:12px}.content-view-tabs{gap:8px}.content-view-tabs .btn{border-radius:999px}.question-row-actions .btn{padding:7px 12px;font-size:11px}.delete-question-btn{color:#b42324!important}.studio-heading h1{font-size:32px}.studio-heading p{font-size:13px}.studio-grid{gap:26px}.editor-card{border-radius:var(--radius)}
footer{background:var(--bg);border-top:1px solid var(--line);padding:24px max(28px,calc((100vw - 1180px)/2));color:var(--muted);font-size:11px;gap:16px}body[data-page=home] .custom-section{max-width:calc(var(--content-width) - 72px);margin:var(--space) auto}
.apple-intro{background:var(--ink);color:var(--bg)}.apple-intro .eyebrow,.apple-intro p{color:color-mix(in srgb,var(--bg) 68%,var(--ink))}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}
@media(max-width:1000px){body[data-nav=top] .sidebar{padding:12px 24px;gap:15px}body[data-nav=top] #mainnav{gap:0}.apple-hero h1{font-size:56px}.apple-section{padding:60px 26px}.apple-book-card .book-info{padding:23px 20px}.apple-book-card h3{font-size:21px}.apple-card-art{height:265px}.apple-card-art .book-object{width:143px;height:193px}.apple-card-art .object-cover strong{font-size:17px}.book-grid{gap:15px}.apple-book-card .book-meta{flex-wrap:wrap}.apple-section h2{font-size:32px}.apple-product-stage{margin-top:35px}.shell>header{padding:0 24px}main{padding:38px 24px 60px}}
@media(max-width:700px){body[data-nav=top] .sidebar{display:block;padding:11px 18px 6px;max-height:none;overflow:hidden}body[data-nav=top] .brand{max-width:none;margin-bottom:9px;justify-content:center}body[data-nav=top] .brandmark{font-size:28px;line-height:25px}body[data-nav=top] .brand b{font-size:11px}body[data-nav=top] #mainnav{display:flex;flex-wrap:nowrap;justify-content:flex-start;overflow-x:auto;gap:8px;padding:0 0 4px;scrollbar-width:none}body[data-nav=top] #mainnav a{flex:0 0 auto;padding:6px 8px}body[data-nav=top] #mainnav a span:last-child{font-size:11px}.shell>header{padding:0 18px;height:40px}.header-right{gap:12px}.header-name{font-size:10px}.header-label{display:none}.customize-link{font-size:10px}main{padding:32px 18px 50px}h1{font-size:34px}.page-top{margin-bottom:26px}.page-top p{font-size:14px}.apple-hero{padding:40px 20px 0;min-height:0}.apple-hero h1{font-size:44px;line-height:1.17;margin:17px 0}.apple-hero .eyebrow{font-size:9px;letter-spacing:.15em}.apple-hero p{font-size:16px}.apple-hero-actions{gap:18px;margin-top:23px;flex-wrap:wrap}.apple-hero-actions .btn{font-size:13px;padding:10px 18px}.apple-hero-actions .apple-text-link{font-size:13px}.apple-product-stage{height:245px;margin:30px auto 0;width:420px;left:50%;transform:translateX(-50%)}.hero-volume{scale:.73;transform-origin:top left}.volume-0{left:50%;transform:translateX(-50%) rotateY(-9deg) rotateZ(-2deg);margin-left:-28px}.volume-1{left:50%;margin-left:-83px;top:28px}.volume-2{left:50%;margin-left:0;top:28px}.product-ground{bottom:10px}.apple-section{padding:49px 20px}.apple-section h2{font-size:29px}.apple-section .section-title{align-items:flex-start;gap:14px;flex-direction:column;margin-bottom:24px}.section-title .apple-text-link{font-size:13px}.book-grid{grid-template-columns:1fr;gap:20px}.apple-card-art{height:275px}.apple-card-art .book-object{width:159px;height:214px}.apple-card-art .object-cover strong{font-size:21px}.apple-book-card .book-info{padding:23px 27px 27px}.apple-book-card h3{font-size:25px}.apple-book-card p{min-height:0;font-size:14px}.apple-book-card .book-meta{font-size:12px}.apple-intro{padding:50px 20px 0;min-height:480px;margin:0 8px}.apple-intro .eyebrow{font-size:8px;letter-spacing:.1em}.apple-intro h2{font-size:36px}.apple-intro p{font-size:14px}.intro-symbols{font-size:145px;gap:45px;margin-top:40px}.progress-section .stats{grid-template-columns:1fr;gap:16px}.stat{padding:25px}.stat-num{font-size:38px}.book-banner{padding:28px 24px;gap:24px;align-items:flex-start;flex-direction:column-reverse}.book-banner h1{font-size:32px}.book-banner .mini-cover{align-self:center;margin:12px 0 24px}.study-grid{gap:20px}.question-card,.panel{padding:23px}.question-card h2{font-size:19px}.study-top{gap:10px;flex-wrap:wrap}.question-row{padding:20px;gap:14px}.question-row h3{font-size:14px}.admin-tabs{gap:6px}.admin-tabs a{font-size:12px;padding:7px 12px}.studio-heading h1{font-size:26px}.studio-grid{display:block}.preview-panel{margin-top:22px}footer{padding:22px 20px;font-size:10px;flex-wrap:wrap}body[data-page=home] .custom-section{margin:24px 20px}}
@media(max-width:700px){.apple-section{padding-block:calc(var(--space) * 1.5)!important}.apple-product-stage{width:390px;height:235px}.hero-volume{scale:1;transform-origin:center;width:120px;height:165px;margin-left:0;top:32px}.volume-0{width:140px;height:187px;top:9px;transform:translateX(-50%) rotateY(-9deg) rotateZ(-2deg)}.volume-1{transform:translateX(-155%) rotateY(15deg) rotateZ(-11deg)}.volume-2{transform:translateX(52%) rotateY(-18deg) rotateZ(11deg)}.hero-volume .object-cover{padding:15px 12px 12px 14px}.hero-volume .object-cover strong{font-size:15px;margin-top:12px}.volume-0 .object-cover strong{font-size:18px}.hero-volume .cover-publisher,.hero-volume .cover-edition{font-size:5px}.hero-volume .cover-glyph{font-size:43px;margin-bottom:7px}.volume-0 .cover-glyph{font-size:53px}.product-ground{bottom:15px}}

/* The full artwork is visible at the cover's original proportions. */
.real-cover{height:auto!important;aspect-ratio:1000/1414;background:#fff;border-radius:2px 3px 3px 2px}
.real-cover .object-cover-image{display:block;width:100%;height:100%;object-fit:contain;border-radius:inherit}
.real-cover .book-edge{inset:2px -6px 2px auto;width:7px;border-right:1px solid #d7d7d7}
.real-cover:after{content:'';position:absolute;inset:0;pointer-events:none;border-radius:inherit;box-shadow:inset 3px 0 5px #0000000a,inset 0 0 0 1px #00000008}
.headline-gradient{color:var(--ink)}
@supports((-webkit-background-clip:text) or (background-clip:text)){
  .headline-gradient{background-image:var(--headline-gradient);background-size:100% 100%;background-clip:text;-webkit-background-clip:text;color:transparent;-webkit-text-fill-color:transparent;box-decoration-break:clone;-webkit-box-decoration-break:clone}
}
.apple-hero .headline-gradient{display:inline-block;padding-bottom:.07em}
.apple-intro .headline-gradient{--headline-gradient:var(--intro-headline-gradient)}
.collection-stage{position:relative;display:flex;justify-content:center;align-items:flex-end;gap:35px;max-width:1020px;padding:24px 35px 25px;margin:25px auto 0;min-height:328px;perspective:1400px}
.collection-volume{width:178px;position:relative;z-index:2;flex:0 1 178px;min-width:0}
.collection-book{width:100%;transform:rotateY(-8deg) rotateZ(2deg);box-shadow:8px 22px 27px -10px #25235030,0 1px 2px #0001}
.collection-volume-0{margin-bottom:8px}.collection-volume-0 .collection-book{transform:rotateY(12deg) rotateZ(-7deg)}
.collection-volume-1{flex-basis:198px;width:198px;margin-bottom:20px;z-index:3}.collection-volume-1 .collection-book{transform:rotateY(-5deg) rotateZ(-2deg)}
.collection-volume-2{margin-bottom:9px}.collection-volume-2 .collection-book{transform:rotateY(-7deg) rotateZ(3deg)}
.collection-volume-3 .collection-book{transform:rotateY(-12deg) rotateZ(7deg)}
.collection-ground{position:absolute;bottom:7px;left:7%;width:86%;height:40px;background:radial-gradient(ellipse,#463b6a16,transparent 68%);filter:blur(9px)}
.apple-hero{padding-top:52px;position:relative}.apple-hero:before{content:'';position:absolute;pointer-events:none;left:15%;right:15%;bottom:0;height:42%;background:radial-gradient(ellipse at bottom,color-mix(in srgb,var(--gradient-middle) 8%,transparent),transparent 70%)}
.apple-card-art{height:310px;background:linear-gradient(150deg,var(--surface),var(--bg));padding:25px 20px}
.apple-card-art .real-cover{width:160px;transform:rotateY(-8deg) rotateZ(-2deg)}
.apple-book-card .book-info{padding:23px 23px 26px}
.apple-book-card h3{font-size:23px;line-height:1.35;min-height:62px}
.apple-book-card p{margin:12px 0 22px;min-height:68px}
.apple-book-card .book-meta{margin-top:auto;align-items:flex-end}
.book-banner .mini-cover{width:178px;height:auto;aspect-ratio:1000/1414}
.mini-cover .real-cover{width:178px;transform:rotateY(-6deg) rotateZ(3deg)}
.book-swatch{background:#fff!important;min-height:210px;display:flex;align-items:center;justify-content:center;padding:12px}
.book-swatch img{height:210px!important;max-width:100%;width:auto!important;object-fit:contain}
.gradient-example{padding:24px 0;font-size:29px;font-weight:750;line-height:1.3;letter-spacing:-.04em}
.gradient-editor .checkline{margin-top:0}
@media(min-width:701px) and (max-width:1100px){.book-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.collection-stage{gap:24px;padding-inline:22px}.collection-volume{flex-basis:150px}.collection-volume-1{flex-basis:168px}.apple-book-card h3{min-height:0}.apple-book-card p{min-height:46px}}
@media(max-width:700px){
  .apple-hero{padding-top:40px}.apple-hero h1{font-size:42px}.apple-hero p{font-size:16px}
  .collection-stage{display:grid;grid-template-columns:repeat(2,112px);justify-content:center;align-items:center;gap:24px 35px;width:100%;max-width:340px;min-height:0;margin:28px auto 0;padding:12px 0 36px;left:auto;transform:none}
  .collection-volume,.collection-volume-1{width:112px;flex-basis:auto;margin:0}
  .collection-volume-0 .collection-book{transform:rotateY(8deg) rotateZ(-4deg)}
  .collection-volume-1 .collection-book{transform:rotateY(-6deg) rotateZ(3deg)}
  .collection-volume-2 .collection-book{transform:rotateY(6deg) rotateZ(-3deg)}
  .collection-volume-3 .collection-book{transform:rotateY(-8deg) rotateZ(4deg)}
  .collection-ground{bottom:14px;left:0;width:100%}
  .apple-card-art{height:310px;padding:28px}.apple-card-art .real-cover{width:170px}
  .apple-book-card .book-info{padding:24px 27px 27px}.apple-book-card h3{font-size:25px;min-height:0}.apple-book-card p{font-size:14px;min-height:0}
  .book-banner .mini-cover{width:156px;height:auto;aspect-ratio:1000/1414}.mini-cover .real-cover{width:156px}
}
@media(forced-colors:active){.headline-gradient{background:none;color:CanvasText;-webkit-text-fill-color:CanvasText}}
@media print{.headline-gradient{background:none;color:var(--ink);-webkit-text-fill-color:var(--ink)}}

/* Full-width editorial product sections with the original portrait photos. */
body[data-page=home] main>.product-showcase{margin:12px 12px 0}
.product-showcase{--showcase-bg:#f0f0f8;--showcase-ink:#1d1d1f;position:relative;overflow:hidden;background:var(--showcase-bg);color:var(--showcase-ink)}
.product-showcase.tone-dark{--showcase-bg:#061326;--showcase-ink:#f5f5f7;--headline-gradient:var(--intro-headline-gradient)}
.product-showcase.tone-warm{--showcase-bg:#f8f5f1;--showcase-ink:#292521}
.showcase-inner{max-width:1240px;margin:auto;padding:64px 66px;display:grid;grid-template-columns:1fr 1fr;gap:66px;align-items:center;min-height:720px}
.showcase-copy{position:relative;z-index:3;min-width:0}.showcase-copy>.eyebrow{font-size:10px;letter-spacing:.18em;color:inherit;opacity:.65;margin-bottom:20px}
.showcase-title{font-size:calc(37px * var(--font-scale));font-weight:700;line-height:1.25;letter-spacing:-.045em;margin:0 0 19px;word-break:keep-all}
.showcase-headline{font-size:calc(45px * var(--font-scale));line-height:1.18;letter-spacing:-.055em;font-weight:750;margin:0 0 24px;word-break:keep-all;overflow-wrap:normal}
.showcase-description{color:inherit;opacity:.72;font-size:17px;line-height:1.8;letter-spacing:-.035em;margin:0 0 30px}
.showcase-headline .headline-gradient{display:inline-block;padding-bottom:.08em}
.showcase-actions{display:flex;align-items:center;gap:12px;flex-wrap:wrap}.showcase-actions .btn{padding:11px 21px;font-size:13px}
.showcase-secondary{background:transparent;border-color:var(--green);color:var(--green)}
.tone-dark .showcase-secondary{color:#83b8ff;border-color:#528fdf}.tone-dark .showcase-actions .primary{background:#0071e3;border-color:#0071e3;color:#fff}
.showcase-editions{display:flex;gap:22px;flex-wrap:wrap;margin-top:25px;color:inherit;opacity:.65;font-size:10px;letter-spacing:.04em}.showcase-editions a:hover{opacity:1;text-decoration:underline}
.showcase-art{position:relative;width:100%;max-width:474px;aspect-ratio:688/934;margin-left:auto;perspective:1100px}
.showcase-scene{display:block;width:100%;height:100%;object-fit:contain;border-radius:3px;box-shadow:0 18px 40px -20px #14112355}
.showcase-covers{position:absolute;left:-35px;right:20px;bottom:27px;display:flex;justify-content:flex-start;align-items:flex-end;gap:14px;pointer-events:none}
.showcase-covers .showcase-cover{width:126px;height:auto;transform:rotateY(-12deg) rotateZ(-8deg);box-shadow:10px 15px 20px -5px #0005}
.showcase-covers .showcase-cover:nth-child(2){width:116px;transform:rotateY(-10deg) rotateZ(5deg);margin-bottom:9px}
.tone-dark .showcase-scene{box-shadow:0 25px 60px -20px #0008}
.product-showcase .real-cover .book-edge{border-color:#dbdbdb}
body[data-page=discover] main{max-width:none;padding:0}
.product-local-nav{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:15px max(30px,calc((100vw - 1120px)/2));background:var(--surface);border-bottom:1px solid var(--line);font-size:12px}
.product-local-nav>a:first-child{color:var(--muted);white-space:nowrap}.product-local-nav strong{margin-right:auto;font-size:14px;font-weight:600}.product-local-nav .btn{font-size:11px;padding:7px 16px}
.showcase-detail .showcase-inner{max-width:1240px;min-height:720px}
.product-intro-section{max-width:1240px;margin:0 auto;padding:85px 60px 90px}
.product-intro-section>h2{font-size:48px;line-height:1.2;letter-spacing:-.045em;margin-top:20px}
.product-feature-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:30px;margin-top:52px}
.product-feature-grid article{border-top:1px solid var(--line);padding-top:23px}
.product-feature-grid h3{font-size:22px;line-height:1.4;letter-spacing:-.045em;margin:14px 0}
.product-feature-grid p{font-size:15px;line-height:1.8;color:var(--muted)}
.product-start{text-align:center;background:var(--surface);padding:75px 24px 85px}
.product-start h2{font-size:36px;line-height:1.4;letter-spacing:-.045em;margin:15px 0}
.product-start p{color:var(--muted);font-size:14px;margin:18px 0 25px}
@media(min-width:701px) and (max-width:1100px){.showcase-inner{padding:50px 40px;gap:40px;min-height:620px}.showcase-title{font-size:31px}.showcase-headline{font-size:36px}.showcase-description{font-size:15px}.showcase-covers .showcase-cover{width:104px}.showcase-covers .showcase-cover:nth-child(2){width:96px}.showcase-covers{left:-20px}}
@media(max-width:700px){
  body[data-page=home] main>.product-showcase{margin:8px 8px 0}
  .showcase-inner{display:flex;flex-direction:column;gap:36px;min-height:0;padding:45px 24px 32px;text-align:center}
  .showcase-copy{width:100%}.showcase-copy>.eyebrow{font-size:8px;letter-spacing:.12em;margin-bottom:16px}
  .showcase-title{font-size:29px;margin-bottom:16px}.showcase-headline{font-size:35px;margin-bottom:18px}.showcase-description{font-size:14px;margin-bottom:24px}
  .showcase-actions{justify-content:center;gap:10px}.showcase-actions .btn{font-size:12px;padding:10px 17px}
  .showcase-editions{justify-content:center;gap:18px;margin-top:20px;font-size:9px}
  .showcase-art{width:100%;max-width:294px;margin:0 auto}
  .showcase-covers{left:-10px;bottom:20px;gap:10px}.showcase-covers .showcase-cover{width:87px}.showcase-covers .showcase-cover:nth-child(2){width:80px;margin-bottom:4px}
  .product-local-nav{padding:13px 18px;gap:12px;flex-wrap:wrap}.product-local-nav strong{font-size:12px;order:-1;flex:1 0 100%;text-align:center}.product-local-nav .btn{margin-left:auto}
  .showcase-detail .showcase-inner{min-height:0}
  .product-intro-section{padding:52px 25px}.product-intro-section>h2{font-size:35px}
  .product-feature-grid{grid-template-columns:1fr;gap:25px;margin-top:32px}.product-feature-grid h3{font-size:21px}.product-feature-grid p{font-size:14px}
  .product-start{padding:50px 24px 60px}.product-start h2{font-size:29px}.product-start p{font-size:13px}
}

.editorial-hero{position:relative;overflow:hidden;background:var(--hero-bg);color:var(--hero-text);border-bottom:1px solid var(--line)}
.editorial-hero-inner{max-width:1240px;margin:auto;padding:34px 56px 24px;display:grid;grid-template-columns:1.06fr 1fr;gap:55px;align-items:center;min-height:calc(var(--hero-height) + 120px)}
.editorial-copy{position:relative;z-index:2;padding-bottom:8px;min-width:0}
.editorial-copy>.eyebrow{color:inherit;opacity:.6;font-size:10px;letter-spacing:.17em;margin-bottom:27px}
.editorial-copy h1{font-size:calc(58px * var(--font-scale));line-height:1.17;letter-spacing:-.06em;margin:0 0 28px;font-weight:750;word-break:keep-all;overflow-wrap:normal}
.editorial-copy h1 .headline-gradient{display:inline-block;padding-bottom:.07em}
.editorial-description{color:inherit;opacity:.72;font-size:17px;line-height:1.85;letter-spacing:-.03em;margin:0 0 29px}
.editorial-actions{display:flex;align-items:center;gap:23px;flex-wrap:wrap}
.editorial-actions .btn{font-size:13px;padding:12px 22px}
.editorial-actions .apple-text-link{font-size:13px}
.editorial-copy.copy-center{text-align:center}.copy-center .editorial-actions{justify-content:center}
.editorial-product{min-width:0;position:relative;padding:0 10px}
.editorial-product-number{display:flex;align-items:center;justify-content:space-between;gap:20px;font-size:9px;letter-spacing:.14em;color:inherit;opacity:.45;margin-bottom:0}
.editorial-book-display{position:relative;height:340px;display:flex;align-items:center;justify-content:center;perspective:1300px}
.editorial-book-display .book-object{width:226px;transform:rotateY(-12deg) rotateZ(4deg);position:relative;z-index:2;box-shadow:15px 22px 30px -10px #27334c35,0 1px 2px #0002;transition:transform .35s}
.editorial-book-display:hover .book-object{transform:rotateY(-5deg) rotateZ(1deg) translateY(-4px)}
.editorial-book-display .book-edge{width:8px;right:-7px}
.editorial-glow{position:absolute;inset:16px -30px 0;background:radial-gradient(ellipse at 50% 48%,color-mix(in srgb,var(--gradient-middle) 13%,transparent),color-mix(in srgb,var(--gradient-end) 7%,transparent) 38%,transparent 68%);filter:blur(15px)}
.editorial-ground{position:absolute;bottom:7px;left:14%;width:72%;height:22px;border-radius:50%;background:radial-gradient(ellipse,#33405b1c,transparent 70%);filter:blur(9px)}
.editorial-product-caption{display:flex;justify-content:space-between;align-items:center;gap:15px;padding-top:15px;margin-top:6px}
.editorial-series{display:block;font-size:8px;letter-spacing:.13em;opacity:.55;line-height:1.5;margin-bottom:6px}
.editorial-product-caption h2{font-size:21px;line-height:1.3;letter-spacing:-.04em;font-weight:650}
.editorial-product-caption .apple-text-link{font-size:11px;flex-shrink:0}
.editorial-product-caption .apple-text-link:after{font-size:17px}
.editorial-collection{max-width:1240px;margin:auto;padding:0 56px 24px}
.editorial-collection-heading{display:flex;align-items:center;justify-content:space-between;border-top:1px solid color-mix(in srgb,var(--hero-text) 12%,transparent);padding-top:17px;margin-bottom:12px;color:inherit}
.editorial-collection-heading span:first-child{font-size:8px;letter-spacing:.14em;opacity:.5}
.editorial-collection-heading span:last-child{font-size:10px;opacity:.58}
.editorial-choices{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px}
.editorial-choice{border:1px solid transparent;background:transparent;color:inherit;border-radius:13px;display:flex;align-items:center;gap:13px;padding:13px 14px;text-align:left;min-width:0;position:relative;transition:background .2s,border-color .2s}
.editorial-choice:hover{background:color-mix(in srgb,var(--surface) 45%,transparent)}
.editorial-choice.is-active{background:var(--surface);color:var(--ink);border-color:color-mix(in srgb,var(--line) 65%,transparent);box-shadow:0 3px 14px #00000003}
.editorial-choice-art{width:32px;height:45px;display:flex;align-items:center;justify-content:center;flex-shrink:0;perspective:300px}
.editorial-choice-art img{display:block;width:100%;height:100%;object-fit:contain;box-shadow:2px 3px 5px #0002;transform:rotate(-3deg)}
.editorial-choice-art>span{font-family:Georgia,serif;font-size:27px;color:var(--green)}
.editorial-choice-copy{display:block;min-width:0}.editorial-choice-copy strong{font-size:12px;font-weight:600;line-height:1.45;display:block;word-break:keep-all}
.editorial-choice-copy small{font-size:8px;line-height:1.5;opacity:.55;letter-spacing:.04em;display:block;margin-top:5px}
.editorial-choice-indicator{width:4px;height:4px;border-radius:50%;background:transparent;position:absolute;right:11px;top:11px}
.is-active .editorial-choice-indicator{background:var(--green)}
.editorial-custom-image{display:flex;align-items:center;justify-content:center;min-width:0}
.editorial-custom-image img{max-width:100%;max-height:390px;object-fit:contain;border-radius:12px}
.editorial-hero.without-art .editorial-hero-inner{display:block;min-height:360px;padding-block:65px}.without-art .editorial-copy{max-width:760px;margin:auto}
.editorial-hero.composition-center .editorial-hero-inner{grid-template-columns:1fr;text-align:center;gap:27px;padding-top:50px;max-width:980px}
.composition-center .editorial-copy{text-align:center;max-width:780px;margin:auto}
.composition-center .editorial-actions{justify-content:center}.composition-center .editorial-product{width:100%;max-width:520px;margin:auto}
.composition-center .editorial-copy h1{font-size:60px}
@media(min-width:701px) and (max-width:1050px){.editorial-hero-inner{padding:42px 35px 30px;gap:25px;min-height:480px}.editorial-copy h1{font-size:48px}.editorial-description{font-size:15px}.editorial-book-display{height:330px}.editorial-book-display .book-object{width:202px}.editorial-product-caption{align-items:flex-start;flex-direction:column;gap:9px}.editorial-product-caption h2{font-size:18px}.editorial-collection{padding:0 35px 25px}.editorial-choice{padding:12px 8px;gap:9px}.editorial-choice-copy strong{font-size:11px}.editorial-choice-art{width:27px;height:38px}.editorial-choice-copy small{font-size:7px}.editorial-actions{gap:16px}.editorial-actions .apple-text-link{font-size:12px}}
@media(max-width:700px){
  .editorial-hero-inner{display:flex;flex-direction:column;gap:28px;min-height:0;padding:38px 25px 25px}
  .editorial-copy,.editorial-copy.copy-center{text-align:center;width:100%;padding-bottom:0}
  .editorial-copy>.eyebrow{font-size:8px;letter-spacing:.13em;margin-bottom:20px}
  .editorial-copy h1,.composition-center .editorial-copy h1{font-size:42px;line-height:1.2;letter-spacing:-.065em;margin-bottom:19px}
  .editorial-description{font-size:14px;line-height:1.8;margin-bottom:23px}
  .editorial-actions{justify-content:center;gap:17px}.editorial-actions .btn{font-size:12px;padding:10px 19px}.editorial-actions .apple-text-link{font-size:12px}
  .editorial-product{width:100%;max-width:340px;padding:0 8px}.editorial-product-number{font-size:7px;letter-spacing:.12em}
  .editorial-book-display{height:293px}.editorial-book-display .book-object{width:182px}
  .editorial-product-caption{padding-top:9px;gap:13px;margin-top:0}.editorial-product-caption h2{font-size:18px}.editorial-series{font-size:7px}.editorial-product-caption .apple-text-link{font-size:10px}
  .editorial-glow{inset:5px -15px 0}.editorial-ground{bottom:4px}
  .editorial-collection{padding:0 20px 24px}.editorial-collection-heading{padding-top:16px;margin-bottom:12px}
  .editorial-collection-heading span:first-child{font-size:7px}.editorial-collection-heading span:last-child{font-size:9px}
  .editorial-choices{grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}
  .editorial-choice{padding:11px 10px;gap:10px;border-radius:11px}.editorial-choice-copy strong{font-size:11px}.editorial-choice-copy small{font-size:7px}.editorial-choice-art{width:25px;height:36px}
  .editorial-custom-image img{max-height:310px}
  .editorial-hero.composition-center .editorial-hero-inner{padding-top:38px;gap:28px}.editorial-hero.without-art .editorial-hero-inner{min-height:0;padding-block:45px}
}
@media(prefers-reduced-motion:reduce){.editorial-book-display .book-object,.editorial-choice{transition:none}}

.part1-index{margin:32px 0;padding:32px!important}.part1-index h2{font-size:30px;letter-spacing:-1.1px}.part1-index>.muted{line-height:1.75}.part1-round-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin-top:24px}.part1-round{border:1px solid #e5e5ea;border-radius:18px;padding:22px;transition:background .2s,border-color .2s}.part1-round:hover{background:#f5f7ff;border-color:#91bfff}.part1-round>div:first-child{display:flex;align-items:center;justify-content:space-between}.part1-round b{font-size:29px;color:var(--primary);letter-spacing:-1px}.part1-round b small{font-size:13px;margin-left:4px}.part1-round span{font-size:12px;color:#6e6e73}.part1-round p{min-height:54px;font-size:13px;line-height:1.65;color:var(--text);margin:16px 0}.part1-round .bar{height:3px}.round-toolbar{display:flex;justify-content:space-between;align-items:center;gap:18px;flex-wrap:wrap;margin:20px 0 30px;color:var(--muted);font-size:13px}.round-toolbar>div{display:flex;gap:10px}.part1-list-link{display:flex;justify-content:space-between;align-items:center;background:#f5f5f7;padding:22px 26px;border-radius:20px;gap:15px;margin-bottom:24px}.part1-list-link b,.part1-list-link span{display:block}.part1-list-link span{margin-top:5px;font-size:13px;color:#6e6e73}.explanation-media-editor{margin:30px 0;padding:28px;background:#f5f5f7;border-radius:24px}.explanation-media-editor h2{font-size:23px;letter-spacing:-.8px}.media-drop{text-align:center;border:1px dashed #b8beca;border-radius:17px;padding:25px 20px;background:var(--surface,#fff);margin-top:20px;transition:background .2s}.media-drop.drag-over{background:#e5f1ff;border-color:var(--primary)}.media-add-symbol{display:block;font-size:34px;font-weight:300;color:var(--primary);line-height:1.1;margin-bottom:10px}.media-drop b{font-size:17px}.media-drop p{font-size:13px;line-height:1.7;color:#6e6e73;margin:12px 0 18px}.media-drafts{display:grid;gap:16px}.media-draft{display:grid;grid-template-columns:180px 1fr;gap:22px;padding:20px;border:1px solid #e3e3e8;background:var(--surface,#fff);border-radius:18px}.media-draft-preview{display:flex;align-items:center;justify-content:center;min-height:160px;background:#f5f5f7;border-radius:10px;overflow:hidden}.media-draft-preview img{max-width:100%;max-height:200px;object-fit:contain}.media-draft-fields label{font-size:12px!important;margin:0 0 7px!important}.media-draft-fields .media-caption{min-height:70px;resize:vertical;margin-bottom:15px}.media-draft-fields .field{margin-bottom:12px}.media-draft-actions{display:flex;gap:8px;flex-wrap:wrap}.media-remove{color:#b42318!important}.explanation-gallery{border-top:1px solid #e5e5ea;margin:32px 0 0;padding-top:28px}.gallery-heading h3{margin:7px 0 24px!important;font-size:23px}.explanation-gallery figure{margin:0 0 26px}.explanation-image{position:relative;display:block;width:100%;border:1px solid #e5e5ea;background:#fafafa;border-radius:18px;overflow:hidden;padding:20px;cursor:zoom-in}.explanation-image img{display:block;max-width:100%;max-height:650px;object-fit:contain;margin:auto}.explanation-image span{display:inline-block;color:#6e6e73;font-size:11px;margin-top:12px}.explanation-gallery figcaption,.enlarged-explanation figcaption{font-size:13px;color:#6e6e73;line-height:1.7;padding:12px 6px;white-space:pre-wrap}.enlarged-explanation{margin:0}.enlarged-explanation img{display:block;width:100%;object-fit:contain}.part1-source{margin:28px 0 8px;border:1px solid #dfe3e8;border-radius:16px;overflow:hidden}.part1-source>summary{padding:20px;cursor:pointer;font-weight:650;background:#f5f5f7;font-size:15px}.part1-source>summary span{font-weight:400;font-size:12px;color:#6e6e73;margin-left:9px}.source-viewer{padding:20px}.source-page-toolbar{display:flex;align-items:center;gap:12px;margin:18px 0}.source-page-toolbar label{margin:0!important;font-size:12px!important}.source-page-toolbar select{margin:0!important;width:100px}.source-page-image{display:block;width:100%;height:auto;border:1px solid #eee}.source-viewer figure{margin:0}.source-viewer figcaption{text-align:center;color:#6e6e73;font-size:11px;padding:12px}.source-difference{border-left:3px solid #b3c9e6;background:#f5f8fd;padding:16px 20px;border-radius:0 12px 12px 0;margin:25px 0;font-size:13px;line-height:1.8}.source-difference p{margin:8px 0 0}.ox-editor .form-actions{margin-top:30px}.part1-round:focus-visible,.explanation-image:focus-visible{outline:3px solid #0071e3;outline-offset:4px}
@media(max-width:900px){.part1-round-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.media-draft{grid-template-columns:140px 1fr;gap:16px}.part1-index{padding:24px!important}}
@media(max-width:600px){.part1-index{padding:20px!important}.part1-index .section-title{align-items:flex-start;gap:12px;flex-direction:column}.part1-index h2{font-size:26px}.part1-round-grid{grid-template-columns:1fr 1fr;gap:9px}.part1-round{padding:16px 13px}.part1-round>div:first-child{align-items:flex-start;gap:5px;flex-direction:column}.part1-round p{font-size:12px;min-height:78px;margin:12px 0}.part1-list-link{align-items:flex-start;flex-direction:column}.explanation-media-editor{padding:20px 14px}.explanation-media-editor h2{font-size:21px}.media-draft{grid-template-columns:1fr;padding:15px}.media-draft-preview{min-height:120px}.media-draft-preview img{max-height:190px}.source-viewer{padding:12px}.part1-source>summary span{display:block;margin:7px 0 0}.explanation-image{padding:12px}}

.content-filters{display:flex;align-items:end;gap:16px;flex-wrap:wrap}.content-filters>div{flex:1;min-width:170px}.content-filters input,.content-filters select{margin:0!important}.content-pagination{display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap;margin:24px 0 16px;font-size:13px;color:#6e6e73}.content-pagination>div{display:flex;gap:9px}.media-count-label{display:block;color:var(--primary);font-size:11px;margin-top:7px}

.source-page-zoom{display:block;width:100%;padding:0;border:0;background:#fff;cursor:zoom-in}.source-page-zoom span{display:block;padding:10px;color:#0071e3;font-size:12px}.source-page-toolbar{flex-wrap:wrap}

/* SIMPLICITY: an airy editorial canvas, blue to mint, with one consistent S signature. */
.identity-mark{display:inline-flex;align-items:center;justify-content:center;flex-shrink:0;width:30px;height:42px;vertical-align:middle}.identity-mark svg,.identity-mark img{display:block;height:100%;width:100%;object-fit:contain}.identity-lockup{display:inline-flex;align-items:center;gap:13px;min-width:0}.identity-wordmark{display:flex;flex-direction:column;gap:7px;min-width:0}.identity-wordmark b{font-size:15px;font-weight:550;letter-spacing:.21em;line-height:1.3;white-space:nowrap}.identity-wordmark small{font-size:10px;color:inherit;opacity:.6;letter-spacing:.04em;line-height:1.7}.mark-mono{filter:brightness(0) saturate(100%) opacity(.9)}
body[data-nav=top] .identity-brand{max-width:none;gap:0;padding-block:0}.identity-brand .identity-mark{height:var(--brand-logo-size);width:calc(var(--brand-logo-size) * .716)}body[data-nav=top] .identity-brand b{font-size:12px;letter-spacing:.17em;font-weight:600}.identity-brand .identity-lockup{gap:13px}body[data-nav=top] .sidebar{padding-block:10px;min-height:68px}body[data-nav=top] #mainnav a{font-size:12px;font-weight:500;padding-inline:10px}body[data-nav=top] #mainnav a.active span:last-child{position:relative}body[data-nav=top] #mainnav a.active span:last-child:after{content:'';position:absolute;bottom:-11px;left:0;right:0;height:2px;background:linear-gradient(90deg,var(--brand-blue),var(--brand-mint));border-radius:2px}
.identity-hero{background:var(--hero-bg);isolation:isolate}.identity-hero .editorial-hero-inner{padding-top:44px;padding-bottom:35px;gap:72px;max-width:1260px;min-height:550px}.identity-hero-signature{margin-bottom:37px;color:var(--hero-text)}.identity-hero-signature .identity-lockup{gap:19px}.identity-hero-signature .identity-mark{height:77px;width:55px}.identity-hero-signature .identity-wordmark b{font-size:23px;font-weight:500;letter-spacing:.19em}.identity-hero-signature .identity-wordmark small{font-size:11px;letter-spacing:.07em;opacity:.65;margin-top:2px}.identity-hero .editorial-copy>.eyebrow{font-size:9px;letter-spacing:.21em;margin-bottom:18px;color:var(--muted);opacity:.7}.identity-hero .editorial-copy h1{font-size:calc(56px * var(--font-scale));line-height:1.22;letter-spacing:-.06em;margin-bottom:25px}.identity-hero .editorial-description{font-size:15px;line-height:1.9;margin-bottom:28px}.identity-hero .editorial-book-display{height:360px}.identity-hero .editorial-book-display .book-object{width:224px;transform:rotateY(-10deg) rotateZ(3deg)}.identity-hero-watermark{position:absolute!important;width:260px!important;height:363px!important;right:-8px;top:0;opacity:.10;transform:rotate(9deg);z-index:0;pointer-events:none}.identity-hero .editorial-glow{background:radial-gradient(ellipse at 48% 54%,#a7f3d061,transparent 67%);filter:blur(22px)}.identity-hero .editorial-product-number{color:var(--hero-text);opacity:.5;letter-spacing:.18em;font-size:8px}.identity-hero .editorial-product-caption{padding-top:10px}.identity-hero .editorial-product-caption h2{font-size:21px}.identity-hero .editorial-collection{padding-bottom:31px;max-width:1260px}.identity-hero .editorial-choices{gap:8px}.identity-hero .editorial-choice{background:color-mix(in srgb,var(--hero-text) 2.5%,transparent);border-color:color-mix(in srgb,var(--hero-text) 5%,transparent);border-radius:16px}.identity-hero .editorial-choice.is-active{background:var(--surface);border-color:color-mix(in srgb,var(--green) 28%,var(--surface));box-shadow:0 5px 20px #0f2d4a08}.identity-hero .editorial-choice-art{width:30px;height:42px}.identity-hero .editorial-choice-copy strong{font-size:11px}.identity-hero .editorial-choice-indicator{background:transparent;width:5px;height:5px}.identity-hero .is-active .editorial-choice-indicator{background:#34bd9a}
.identity-story{background:var(--brand-dark);color:#fff;overflow:hidden;position:relative}.identity-story-inner{max-width:1160px;margin:auto;display:grid;grid-template-columns:.85fr 1.15fr;gap:100px;align-items:center;padding:98px 48px}.identity-story-art{display:flex;align-items:center;flex-direction:column;text-align:center;position:relative}.identity-story-art:before{content:'';position:absolute;width:330px;height:330px;top:0;left:50%;transform:translateX(-50%);background:radial-gradient(ellipse,#38bdf813,transparent 68%);pointer-events:none}.identity-story .story-mark{width:153px;height:214px;position:relative;filter:drop-shadow(0 22px 22px #0002)}.identity-story-wordmark{font-size:26px;letter-spacing:.22em;margin-top:30px;font-weight:450}.identity-story-art>small{font-size:11px;letter-spacing:.09em;opacity:.5;margin-top:15px}.identity-story-copy>.eyebrow{font-size:9px;letter-spacing:.21em;color:#a9cedd;margin-bottom:22px}.identity-story-copy h2{font-size:43px;letter-spacing:-.055em;line-height:1.3;margin:0 0 23px;font-weight:650}.identity-story-copy p{font-size:14px;line-height:1.95;opacity:.74;margin-bottom:24px}.identity-story .headline-gradient{background-image:var(--intro-headline-gradient);-webkit-background-clip:text;background-clip:text;color:transparent}.identity-pillars{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;border-top:1px solid #ffffff25;margin:28px 0 30px;padding-top:18px}.identity-pillars>div{display:flex;flex-direction:column;gap:11px}.identity-pillars span{color:#84e2ce;font-size:9px;letter-spacing:.14em}.identity-pillars strong{font-size:12px;font-weight:450;line-height:1.5;word-break:keep-all}.identity-story .btn.primary{background:#fff;color:var(--brand-dark);border-color:#fff;font-size:12px}.identity-story.tone-light{background:var(--surface);color:var(--ink)}.identity-story.tone-light .identity-story-copy>.eyebrow{color:var(--green)}.identity-story.tone-light .identity-pillars{border-color:var(--line)}.identity-story.tone-light .identity-pillars span{color:var(--green)}.identity-story.tone-light .btn.primary{background:var(--green);border-color:var(--green);color:var(--primary-text)}.identity-story.tone-light .headline-gradient{background-image:var(--headline-gradient)}
.identity-showcase-signature{display:inline-flex;align-items:center;gap:9px;font-size:9px;letter-spacing:.19em;margin-bottom:23px;color:var(--showcase-ink);opacity:.85}.identity-showcase-signature .identity-mark{width:17px;height:24px}.identity-book-seal{position:absolute;top:20px;left:23px;display:flex;align-items:center;gap:7px;font-size:8px;letter-spacing:.14em;z-index:2;color:var(--ink);opacity:.75;pointer-events:none}.identity-book-seal .identity-mark{width:14px;height:20px}.apple-card-art{position:relative}.identity-page-signature{display:flex;align-items:center;gap:10px;color:var(--muted);font-size:9px;letter-spacing:.19em;margin-bottom:23px}.identity-page-signature .identity-mark{width:19px;height:27px}.identity-study-signature{display:flex;align-items:center;gap:12px;padding-bottom:22px;border-bottom:1px solid var(--line);margin-bottom:28px}.identity-study-signature .identity-mark{width:24px;height:34px}.identity-study-signature>div{display:flex;flex-direction:column;gap:6px}.identity-study-signature strong{font-size:10px;letter-spacing:.18em;font-weight:600}.identity-study-signature>div>span{font-size:10px;color:var(--muted);letter-spacing:.02em}.identity-study-signature>a{margin-left:auto;font-size:11px;color:var(--green)}
.shell>footer{padding:0!important;display:block!important;border:0!important;max-width:none!important;width:100%;background:transparent}.identity-footer{padding:57px max(36px,calc((100vw - 1120px)/2)) 27px;background:var(--brand-dark);color:#fff}.identity-footer-top{display:flex;align-items:center;justify-content:space-between;gap:40px;padding-bottom:40px}.identity-footer-logo .identity-mark{width:45px;height:63px}.identity-footer-logo .identity-wordmark b{font-size:20px;font-weight:450;letter-spacing:.21em;color:inherit}.identity-footer-logo .identity-wordmark small{font-size:11px;opacity:.55}.identity-footer h2{font-size:27px;line-height:1.5;letter-spacing:-.04em;font-weight:450;color:inherit;text-align:right}.identity-footer-bottom{border-top:1px solid #ffffff25;padding-top:22px;display:flex;align-items:center;justify-content:space-between;gap:20px;font-size:10px;color:#c9d6e2}.identity-footer-bottom>div{display:flex;gap:19px}.identity-footer-bottom a:hover{color:#a7f3d0}.identity-footer-bottom>span:last-child{max-width:220px;text-align:right;line-height:1.7;opacity:.65}.identity-footer.tone-light{background:var(--surface);color:var(--ink)}.identity-footer.tone-light .identity-footer-bottom{border-color:var(--line);color:var(--muted)}.identity-footer-simple{padding:25px 36px;display:flex;justify-content:space-between;gap:20px;font-size:11px;color:var(--muted);border-top:1px solid var(--line)}.tone-dark .mark-mono{filter:brightness(0) invert(1)}.identity-admin-sample{padding:26px 20px;margin-bottom:22px;display:flex;justify-content:center;background:linear-gradient(130deg,#f0f7ff,#f2fcf7);border:1px solid var(--line);border-radius:16px}.identity-admin-sample .identity-mark{width:36px;height:50px}.identity-admin-sample .identity-wordmark b{font-size:17px}.brand-toggle-grid{padding:12px 0 18px}.brand-toggle-grid .checkline{margin:10px 0}.composition-center .identity-hero-signature{text-align:center}.composition-center .identity-hero-inner{gap:15px}.composition-center .identity-hero-watermark{right:5%}
@media(min-width:701px) and (max-width:1050px){.identity-hero .editorial-hero-inner{padding:40px 35px 30px;gap:40px}.identity-hero .editorial-copy h1{font-size:46px}.identity-hero-signature .identity-mark{height:63px;width:45px}.identity-hero-signature .identity-wordmark b{font-size:19px}.identity-hero .editorial-book-display{height:333px}.identity-hero .editorial-book-display .book-object{width:202px}.identity-story-inner{gap:55px;padding:75px 40px}.identity-story-copy h2{font-size:37px}.identity-story .story-mark{width:129px;height:180px}.identity-story-wordmark{font-size:21px}.identity-footer{padding-inline:35px}}
@media(max-width:700px){body[data-nav=top] .sidebar{padding:11px 20px 9px;gap:9px;min-height:0}.identity-brand .identity-mark{height:calc(var(--brand-logo-size) * .8);width:calc(var(--brand-logo-size) * .573)}body[data-nav=top] .identity-brand b{font-size:11px;letter-spacing:.17em}.identity-brand .identity-lockup{gap:10px}body[data-nav=top] #mainnav a.active span:last-child:after{bottom:-6px}.identity-hero .editorial-hero-inner{padding:35px 24px 25px;min-height:0;gap:27px}.identity-hero-signature{margin-bottom:28px}.identity-hero-signature .identity-lockup{gap:15px}.identity-hero-signature .identity-mark{height:64px;width:46px}.identity-hero-signature .identity-wordmark b{font-size:20px;letter-spacing:.19em}.identity-hero-signature .identity-wordmark small{font-size:9px}.identity-hero .editorial-copy h1{font-size:40px;line-height:1.24;margin-bottom:19px}.identity-hero .editorial-copy>.eyebrow{font-size:7px;margin-bottom:15px}.identity-hero .editorial-description{font-size:13px;line-height:1.85;margin-bottom:23px}.identity-hero .editorial-book-display{height:294px}.identity-hero .editorial-book-display .book-object{width:180px}.identity-hero-watermark{width:190px!important;height:265px!important;right:-1px;top:10px}.identity-hero .editorial-product-caption h2{font-size:17px}.identity-hero .editorial-collection{padding-inline:20px;padding-bottom:25px}.identity-hero .editorial-choice{padding:11px 10px;gap:10px}.identity-hero .editorial-choice-art{width:25px;height:35px}.identity-hero .editorial-choice-copy strong{font-size:10px}.identity-story-inner{display:flex;flex-direction:column;gap:48px;padding:64px 27px 60px}.identity-story .story-mark{width:107px;height:149px}.identity-story-wordmark{font-size:22px;margin-top:23px}.identity-story-art>small{font-size:10px}.identity-story-copy{text-align:center;max-width:430px}.identity-story-copy h2{font-size:35px}.identity-story-copy p{font-size:13px}.identity-story-copy>.eyebrow{font-size:8px;margin-bottom:17px}.identity-pillars{gap:13px;text-align:left}.identity-pillars strong{font-size:11px}.identity-showcase-signature{margin-bottom:17px;font-size:8px}.identity-showcase-signature .identity-mark{width:15px;height:21px}.identity-book-seal{top:15px;left:16px;font-size:7px}.identity-book-seal .identity-mark{width:12px;height:17px}.identity-study-signature{padding-bottom:17px;margin-bottom:22px;gap:10px}.identity-study-signature strong{font-size:9px}.identity-study-signature>div>span{font-size:9px}.identity-study-signature>a{font-size:10px}.identity-footer{padding:42px 25px 24px}.identity-footer-top{align-items:flex-start;flex-direction:column;gap:29px;padding-bottom:30px}.identity-footer-logo .identity-mark{width:34px;height:48px}.identity-footer-logo .identity-wordmark b{font-size:17px}.identity-footer-logo .identity-wordmark small{font-size:10px}.identity-footer h2{text-align:left;font-size:27px;line-height:1.45}.identity-footer-bottom{align-items:flex-start;flex-direction:column;gap:17px;font-size:10px}.identity-footer-bottom>span:last-child{text-align:left;max-width:none}.identity-footer-simple{padding:24px;flex-direction:column}.identity-page-signature{margin-bottom:20px;font-size:8px}}
@media(prefers-reduced-motion:reduce){.identity-hero *{scroll-behavior:auto!important}}

.identity-fallback>span{font-family:Georgia,serif;font-size:1.1em;font-weight:600}.identity-fallback{font-size:34px;line-height:1}.identity-wordmark .identity-kicker{font-size:8px;letter-spacing:.13em;opacity:.6;line-height:1.4}.identity-wordmark:has(.identity-kicker){gap:4px}

/* A figure belongs to one explanation; preserve the complete artwork. */
.individual-figures{margin-top:30px;padding-top:26px;border-top:1px solid var(--line)}
.individual-figures .gallery-heading{margin-bottom:18px}
.individual-figures .gallery-heading h3{font-size:22px;letter-spacing:-.04em;margin:7px 0 0}
.individual-figures .concept-figure{margin:0 0 24px;border:1px solid var(--line);border-radius:18px;overflow:hidden;background:var(--surface)}
.individual-figures .explanation-image{display:block;width:100%;padding:20px 18px 12px;border:0;border-radius:0;background:#fff;cursor:zoom-in}
.individual-figures .explanation-image img{display:block;width:auto;height:auto;max-width:100%;max-height:560px;margin:0 auto;object-fit:contain;background:#fff}
.individual-figures .explanation-image span{display:block;position:static;padding:8px 0 0;font-size:11px;color:#63758a;background:transparent;text-align:right}
.individual-figures figcaption{display:flex;align-items:flex-start;gap:12px;padding:16px 18px;margin:0;text-align:left;border-top:1px solid var(--line)}
.concept-figure-number{font-size:12px;font-weight:700;color:var(--green);line-height:23px}
.individual-figures figcaption strong{display:block;font-size:14px;font-weight:650;color:var(--ink);line-height:1.6}
.individual-figures figcaption small{display:block;font-size:10px;color:var(--muted);margin-top:4px;line-height:1.5}
.individual-enlarged{margin:0;background:#fff;border-radius:12px;padding:12px}
.individual-enlarged img{max-height:none!important;width:auto!important;max-width:100%;height:auto;display:block;margin:auto}
.individual-enlarged figcaption{color:#263747;text-align:center;font-size:14px;padding:16px 0 4px}
.media-add-actions{display:flex;gap:10px;justify-content:center;flex-wrap:wrap}
.media-draft-preview{background:#fff}
.docx-library{padding:16px 6px;max-width:1040px}
.docx-library h2{font-size:30px;letter-spacing:-.05em;line-height:1.35;margin:10px 0 14px;padding-right:20px}
.docx-library>p{line-height:1.8}
.docx-library-filters{display:grid;grid-template-columns:1fr 160px;gap:10px;margin:24px 0 12px}
.docx-library-filters .field{min-width:0;width:100%;margin:0}
.docx-figure-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;margin:16px 0 24px}
.docx-figure-card{display:flex;flex-direction:column;min-width:0;background:var(--surface);border:1px solid var(--line);border-radius:16px;overflow:hidden;padding:0 0 14px;cursor:pointer;text-align:left;color:var(--ink);font:inherit;transition:border-color .15s,box-shadow .15s}
.docx-figure-card:hover,.docx-figure-card:focus-visible{border-color:var(--green);box-shadow:0 3px 12px #0f2d4a12}
.docx-figure-card:disabled{opacity:.55;cursor:default}
.docx-figure-thumb{display:flex;align-items:center;justify-content:center;width:100%;height:155px;background:#fff;padding:12px;border-bottom:1px solid var(--line)}
.docx-figure-thumb img{width:auto;height:auto;max-height:100%;max-width:100%;object-fit:contain}
.docx-figure-title{font-size:13px;line-height:1.6;font-weight:650;padding:12px 12px 0}
.docx-figure-source{font-size:10px;color:var(--muted);padding:8px 12px 0;margin-top:auto}
.docx-figure-pagination{display:flex;justify-content:center;gap:24px;align-items:center;font-size:12px}
.docx-figure-empty{grid-column:1/-1;text-align:center;padding:40px 10px;color:var(--muted)}
.sr-only{position:absolute!important;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.explanation-supplement{border:1px solid var(--line);border-radius:14px;padding:16px 18px;margin:24px 0}
.explanation-supplement summary{cursor:pointer;font-size:13px;font-weight:650;color:var(--ink)}
.explanation-supplement summary span{font-size:10px;font-weight:400;color:var(--muted);margin-left:8px}
.explanation-supplement[open] summary{margin-bottom:16px}
@media(min-width:1180px){.study-grid{grid-template-columns:minmax(0,.88fr) minmax(0,1.12fr)}}
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.explanation-emphasis{color:#1462c6;font-weight:750}.tone-emphasis{color:#1462c6;border-color:#cbdffd;background:#f2f7ff}.color-tool.tone-emphasis:hover{background:#e4efff}.explanation-legend{flex-wrap:wrap;gap:12px}.essential-explanation p{margin:0 0 14px;white-space:pre-wrap}.source-matrix{max-width:100%;overflow:auto;margin:18px 0;border:1px solid #dce3e9;border-radius:12px;background:#fff}.source-matrix table{border-collapse:collapse;width:100%;min-width:280px;font-size:14px;line-height:1.7;white-space:pre-wrap}.source-matrix th,.source-matrix td{border:1px solid #e0e5eb;padding:12px 15px;vertical-align:top;min-width:80px}.source-matrix th{background:#f3f7fa;color:#223b50;font-weight:650}.source-question-context .source-matrix th{font-weight:500;color:inherit;background:transparent}.source-question-figure{max-width:620px;margin:24px auto}.question-figure-art{position:relative}.question-figure-art img{display:block;width:100%;height:auto}.question-figure-label{position:absolute;display:block;transform:translate(-50%,-10%);color:#101820;background:rgba(255,255,255,.92);font-weight:750;font-size:clamp(13px,2vw,20px);padding:0 3px;white-space:nowrap;line-height:1.2}.source-question-figure figcaption{font-size:12px;color:#758392;margin-top:9px}.option-copy{white-space:pre-wrap}.multi-check{margin-left:auto;border:1.5px solid #bcc9d5;min-width:22px;height:22px;border-radius:6px;display:grid;place-items:center;color:var(--primary);font-weight:800}.selected .multi-check{border-color:currentColor;background:#e5f0ff}.multi-answer-field{display:flex;flex-wrap:wrap;gap:12px;border:1px solid #dce3e9;border-radius:12px;padding:15px;margin:20px 0}.multi-answer-field legend{font-size:13px;font-weight:700}.multi-answer-field label{display:flex;gap:8px;align-items:center;background:#f5f7fa;border-radius:9px;padding:10px;margin:0;cursor:pointer}.multi-answer-field input{width:18px;height:18px;accent-color:#1462c6}.option-editor-field{min-height:86px}.option-editor-tools{display:flex;flex-wrap:wrap;align-items:center;gap:9px;margin:20px 0 12px}.essential-index .part1-round-grid{grid-template-columns:repeat(3,minmax(0,1fr))}body[data-app-mode="student"] a[href^="#admin"],body[data-app-mode="student"] a[href^="#new"],body[data-app-mode="student"] a[href^="#edit"],body[data-app-mode="student"] a[href^="#bookedit"],body[data-app-mode="student"] a[href^="#menuedit"],body[data-app-mode="student"] a[href^="#pageedit"],body[data-app-mode="student"] .customize-link{display:none!important}.docx-library-filters{grid-template-columns:minmax(180px,1fr) minmax(150px,.6fr) minmax(120px,.5fr)}.student-export-note{font-size:12px;line-height:1.7;color:#64748b}.question-type-line{gap:10px}.essential-explanation .source-matrix{white-space:normal}@media(max-width:720px){.essential-index .part1-round-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.docx-library-filters{grid-template-columns:1fr}.question-figure-label{font-size:13px}.source-matrix table{font-size:13px}.source-matrix td,.source-matrix th{padding:9px}.color-toolbar{gap:6px}.color-tool{font-size:11px;padding:8px}.study-top h1{overflow-wrap:anywhere}}@media(max-width:390px){.essential-index .part1-round-grid{grid-template-columns:1fr}}

.concept-question-row{gap:22px;padding:26px 28px;align-items:center}.question-row-copy{min-width:0}.question-outline{display:flex;align-items:center;flex-wrap:wrap;gap:9px;margin-bottom:9px}.outline-path{display:flex;gap:7px;align-items:center;flex-wrap:wrap;color:#52697d;font-size:11px;font-weight:550;line-height:1.6}.outline-path>span:first-child{color:#3e6384}.outline-separator{color:#9aaabd;font-size:15px}.concept-question-row h3{font-size:17px;line-height:1.65;letter-spacing:-.025em;margin:0 0 9px;color:var(--ink)}.concept-question-row .qnum{font-size:23px;font-weight:400;min-width:35px;text-align:left}.concept-question-row p{margin-top:11px;font-size:11px;line-height:1.6}.question-keywords{display:flex;gap:6px;flex-wrap:wrap;line-height:1.5}.question-keywords span{font-size:10px;color:#527286;background:#f1f5f8;border:1px solid #e5edf2;padding:3px 8px;border-radius:6px}.concept-question-row .badge{white-space:nowrap;font-size:11px}.concept-question-row .badge span{margin-left:8px}.outline-compact{margin:8px 0 9px}.outline-compact .outline-path{font-size:12px}.study-top h1{margin-top:0!important}.question-card>.question-keywords{margin:8px 0 17px}.readable-explanation{white-space:normal!important}.explanation-paragraph,.readable-explanation p{white-space:pre-wrap;line-height:1.95;margin:0 0 1.35em!important;overflow-wrap:anywhere}.readable-explanation p:last-child{margin-bottom:0!important}.explanation-section-heading{font-size:15px;font-weight:750;color:var(--ink);padding-top:.5em}.color-preview .explanation-paragraph{font-size:13px;line-height:1.85}.color-preview{white-space:normal!important}.outline-filters{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:12px 0 18px;padding:16px 18px;background:#f1f5f8;border:1px solid #e5edf2;border-radius:16px}.outline-filters label{margin:0 0 5px;font-size:11px;color:#5c7489}.outline-filters .field{font-size:12px;background:#fff}.outline-editor-fields{margin:20px 0;padding:20px;background:#f4f7fa;border:1px solid #e3eaf0;border-radius:14px}.outline-editor-fields h3{margin:0 0 7px;font-size:16px}.outline-editor-fields .field-help{margin:0 0 12px}.outline-editor-fields label{font-size:12px}.content-management-table .question-keywords{margin:7px 0}.content-management-table .tag{font-size:10px}@media(max-width:700px){.concept-question-row{padding:21px 18px;gap:14px}.concept-question-row h3{font-size:16px}.concept-question-row .qnum{font-size:20px;min-width:27px}.concept-question-row p{font-size:10px}.question-outline{gap:6px}.outline-path{font-size:10px;gap:5px}.question-keywords span{font-size:10px}.concept-question-row .badge{font-size:10px}.outline-filters{padding:13px;gap:9px}.study-top .outline-compact .outline-path{font-size:11px}}@media(max-width:440px){.concept-question-row{position:relative;align-items:flex-start;padding-bottom:31px}.concept-question-row .badge{position:absolute;right:18px;bottom:13px}.question-row-copy{flex:1}.outline-filters{grid-template-columns:1fr}.question-keywords{gap:4px}.outline-editor-fields{padding:14px}}


/* Safari touch layouts, with desktop branding retained. */
html{-webkit-text-size-adjust:100%;scroll-padding-top:85px}body{min-width:0}img,svg{max-width:100%}button,a,input,select,textarea{-webkit-tap-highlight-color:transparent}button,a{touch-action:manipulation}a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:3px solid #218bcb;outline-offset:4px}.mobile-menu-toggle{display:none}.mobile-pagination{display:flex;justify-content:space-between;align-items:center;gap:12px;margin:22px 0;flex-wrap:wrap}.mobile-pagination span{font-size:14px;color:var(--muted)}.mobile-pagination button{min-height:44px;padding:10px 20px}.mobile-pagination button:disabled{opacity:.4;cursor:default}.boot-card{max-width:420px;margin:100px auto;padding:30px;text-align:center;line-height:1.7}.boot-card h1{font-size:28px}.boot-card p{color:#52697d}.boot-card a{display:inline-block;padding:12px 26px;border-radius:30px;background:#0071e3;color:#fff;text-decoration:none}.boot-mark{font-size:36px;color:#28a4ce}dialog{max-height:90vh;max-height:90dvh;overflow:auto;overscroll-behavior:contain;-webkit-overflow-scrolling:touch}dialog .close{min-height:44px;min-width:44px;z-index:3}dialog img{max-width:100%;height:auto}.study-grid>*{min-width:0}.source-matrix{max-width:100%}.explanation-body{overflow-wrap:anywhere}
@media(max-width:1024px){input,select,textarea,.field,.search{font-size:16px!important}button,.btn,.option,.chip{min-height:44px}.study-grid{grid-template-columns:minmax(0,1fr)!important}.question-card,.explanation-card{min-width:0}.question-keywords span{font-size:12px}.outline-path{font-size:12px}.concept-question-row p{font-size:12px}.concept-question-row .badge{font-size:12px}.outline-filters label{font-size:13px}.filterbar{flex-wrap:wrap}.filterbar>*{min-width:0;max-width:100%}}
@media(max-width:900px){body[data-nav=top] .sidebar{display:grid!important;grid-template-columns:minmax(0,1fr) auto;align-items:center;gap:0 12px;padding:8px max(18px,env(safe-area-inset-right)) 8px max(18px,env(safe-area-inset-left));height:auto;min-height:64px;position:sticky;top:0;z-index:50;overflow:visible;background:rgba(255,255,255,.95);-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px)}body[data-nav=top] .sidebar .brand{justify-content:flex-start;margin:0!important;min-height:48px;width:auto;max-width:100%;padding:0;gap:9px}body[data-nav=top] .sidebar .brand b{font-size:15px;white-space:normal}body[data-nav=top] .sidebar .brand small{font-size:8px}.sidebar .brand-symbol{width:30px;height:42px;flex:none}body[data-nav=top] .sidebar .edition,body[data-nav=top] .sidebar .side-bottom{display:none!important}.mobile-menu-toggle{display:flex;align-items:center;justify-content:center;gap:7px;min-width:74px;min-height:44px;padding:8px 10px;border:1px solid #dde7ed;border-radius:24px;color:#17334b;background:#f5f8fa;font-size:13px;font-weight:600}.mobile-menu-icon{font-size:17px}body[data-nav=top] .sidebar #mainnav{display:none!important;grid-column:1/-1;flex-direction:column;margin:8px 0 0;padding:7px 0;border-top:1px solid #e4ebef;gap:3px;white-space:normal;overflow:visible;width:100%;max-height:calc(100dvh - 94px);overflow-y:auto}body[data-nav=top] .sidebar.mobile-nav-open #mainnav{display:flex!important}body[data-nav=top] .sidebar #mainnav a{min-height:46px;font-size:15px;display:flex;align-items:center;justify-content:flex-start;margin:0;padding:11px 14px;border-radius:12px}.shell>header{height:auto;min-height:0;padding:12px max(20px,env(safe-area-inset-right)) 12px max(20px,env(safe-area-inset-left))}.shell>header .header-right{gap:6px}.shell>header .demo-pill{font-size:10px}.shell>header .header-label{font-size:9px}.shell>header .header-name{font-size:12px}.shell>footer{padding-bottom:calc(25px + env(safe-area-inset-bottom))}}
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@media(max-width:1024px){.option{font-size:16px!important}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}

:root{--green:#2563eb;--primary-text:#ffffff;--bg:#f8fafc;--white:#ffffff;--surface:#ffffff;--ink:#0f2d4a;--muted:#63758a;--line:#e2e8f0;--sidebar-bg:#ffffff;--sidebar-text:#0f2d4a;--header-bg:#ffffff;--hero-bg:#ffffff;--hero-text:#0f2d4a;--lime:#a7f3d0;--accent-text:#0f2d4a;--radius:18px;--content-width:1240px;--book-columns:4;--hero-height:360px;--space:32px;--font-scale:1;--body-font:-apple-system,BlinkMacSystemFont,'Apple SD Gothic Neo','Noto Sans KR',sans-serif;--soft:#ebf1fd;--soft-strong:#dae4fc;--headline-gradient:linear-gradient(110deg,#3b82f6,#229cbd,#169d87);--intro-headline-gradient:linear-gradient(110deg,#93bafa,#85c9db,#7fc9bd);--gradient-start:#3b82f6;--gradient-middle:#229cbd;--gradient-end:#169d87;--brand-dark:#0f2d4a;--brand-logo-size:42px;--brand-blue:#3b82f6;--brand-cyan:#38bdf8;--brand-mint:#34d399;}/* Cover-led collection: no large photographic backdrop on the home page. */
.collection-hero{background:var(--hero-bg,#fff);padding:64px 44px 42px!important;max-width:none!important;color:var(--hero-text,#0f2d4a)}
.collection-lead{text-align:center;max-width:820px;margin:0 auto 44px}.collection-lead>.eyebrow{font-size:11px;letter-spacing:.22em;margin-bottom:22px;color:var(--muted,#63758a)}.collection-lead h1{font-size:clamp(38px,4.6vw,62px);font-weight:750;line-height:1.18;letter-spacing:-.055em;margin:0 0 22px}.collection-lead>p{font-size:16px;line-height:1.8;color:var(--muted,#63758a);margin:0 0 20px;word-break:keep-all}.collection-guide-link{color:var(--green,#2563eb);font-size:14px;font-weight:600}.collection-guide-link span{margin-left:8px}
.series-stages{max-width:1180px;margin:auto;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.series-stage{min-width:0;border:1px solid var(--line,#e1e7ee);border-radius:24px;padding:24px 24px 22px;background:var(--surface,#fff);box-shadow:0 10px 28px #0f2d4a04}.series-stage-top{display:flex;justify-content:space-between;font-size:12px;font-weight:650;color:var(--stage-accent);letter-spacing:.02em}.series-stage h2{font-size:23px;letter-spacing:-.045em;margin:12px 0 10px;line-height:1.3}.collection-art{height:228px;display:flex;justify-content:center;align-items:center;gap:12px;position:relative;margin:18px 0 22px;background:linear-gradient(145deg,color-mix(in srgb,var(--stage-accent) 5%,transparent),transparent 70%);border-radius:16px}.collection-art a{display:block;max-width:45%;width:130px;transition:transform .2s ease;transform:translateY(0)}.collection-art img{display:block;width:100%;height:auto;box-shadow:0 14px 24px #0f2d4a20;border-radius:2px}.collection-art a:hover{transform:translateY(-7px)}.collection-art.covers-1 a{width:146px}.collection-art.covers-3{gap:8px}.collection-art.covers-3 a{width:98px;max-width:31%}.series-stage>p{font-size:13px;line-height:1.7;color:var(--muted,#63758a);margin:0 0 18px;min-height:44px;word-break:keep-all}.collection-book-links{display:flex;gap:10px;flex-wrap:wrap;align-items:center;padding-top:15px;border-top:1px solid var(--line,#e1e7ee)}.collection-book-links a{font-size:12px;color:var(--stage-accent);font-weight:600}.collection-book-links a:hover{text-decoration:underline}.collection-book-links span{margin-left:3px}
body[data-page=home] .product-showcase .showcase-scene{display:none}body[data-page=home] .product-showcase{--showcase-bg:var(--surface,#fff);--showcase-ink:var(--text,#0f2d4a);border:1px solid var(--line,#e1e7ee);border-radius:28px;max-width:1180px;margin:24px auto!important}body[data-page=home] .product-showcase .showcase-inner{min-height:470px;padding:48px 56px;gap:48px}body[data-page=home] .showcase-art{aspect-ratio:auto;min-height:320px;display:flex;align-items:center;justify-content:center;max-width:none;margin:0;background:radial-gradient(ellipse,var(--surface,#fff),transparent)}body[data-page=home] .showcase-covers{position:relative;inset:auto;justify-content:center;align-items:center;gap:20px;width:100%}body[data-page=home] .showcase-covers .showcase-cover{width:190px!important;max-width:44%;transform:none!important;box-shadow:8px 16px 25px #0f2d4a1c;margin:0!important}body[data-page=home] .showcase-copy>.eyebrow{color:var(--muted,#63758a)}body[data-page=home] .showcase-headline{font-size:38px}body[data-page=home] .showcase-description{font-size:16px}body[data-page=home] .tone-dark .showcase-secondary{color:var(--green);border-color:var(--green)}
@media(max-width:800px){.collection-hero{padding:42px 22px 30px!important}.series-stages{gap:12px}.series-stage{padding:18px 16px}.series-stage h2{font-size:20px}.collection-art{height:180px}.collection-art.covers-1 a{width:112px}.series-stage>p{font-size:12px;min-height:62px}.collection-book-links{gap:10px}.collection-book-links a{font-size:11px}body[data-page=home] .product-showcase{margin:18px!important}body[data-page=home] .product-showcase .showcase-inner{padding:35px;gap:30px}}
@media(max-width:600px){.collection-lead{margin-bottom:30px}.collection-lead h1{font-size:38px}.collection-lead>p{font-size:14px}.series-stages{grid-template-columns:1fr;gap:16px}.series-stage{padding:22px}.series-stage h2{font-size:25px}.collection-art{height:220px;margin:18px 0}.collection-art.covers-1 a{width:138px}.collection-art.covers-2 a{width:128px}.collection-art.covers-3 a{width:92px}.series-stage>p{min-height:0;font-size:14px}.collection-book-links{gap:18px}.collection-book-links a{font-size:13px}body[data-page=home] .product-showcase{margin:16px!important}body[data-page=home] .product-showcase .showcase-inner{padding:32px 22px;gap:22px;min-height:0}body[data-page=home] .showcase-art{min-height:270px}body[data-page=home] .showcase-covers .showcase-cover{width:160px!important}body[data-page=home] .showcase-headline{font-size:32px}body[data-page=home] .showcase-description{font-size:15px}}
@media(prefers-reduced-motion:reduce){.collection-art a{transition:none}}


/* Shared logo gradient for book and marketing headings. Source covers and learning verdicts retain their original colors. */
@supports(background-clip:text) or (-webkit-background-clip:text){
.headline-gradient,.showcase-title,.showcase-headline,.collection-book-title,.apple-book-card h3,.series-stage h2,.series-stage-top>span:first-child,.editorial-product-caption h2,.product-local-nav strong,.product-start h2,.learning-stage-heading h2,body[data-page=book] .page-top h1,body[data-page=discover] .page-top h1,body[data-page=library] .page-top h1{
background-image:var(--headline-gradient,linear-gradient(110deg,#38a8e8,#2eb7c7,#35bd9f));background-size:100% 100%;background-clip:text;-webkit-background-clip:text;color:transparent;-webkit-text-fill-color:transparent;
}
.identity-story .headline-gradient,.tone-dark .headline-gradient{background-image:var(--headline-gradient,linear-gradient(110deg,#38a8e8,#2eb7c7,#35bd9f))}
}
@media(forced-colors:active){.headline-gradient,.showcase-title,.showcase-headline,.collection-book-title,.apple-book-card h3,.series-stage h2,.series-stage-top>span:first-child,.editorial-product-caption h2,.product-local-nav strong,.product-start h2,.learning-stage-heading h2,body[data-page=book] .page-top h1,body[data-page=discover] .page-top h1,body[data-page=library] .page-top h1{background:none;color:CanvasText;-webkit-text-fill-color:CanvasText}}
@media print{.headline-gradient,.showcase-title,.showcase-headline,.collection-book-title,.series-stage h2{background:none;color:var(--ink);-webkit-text-fill-color:var(--ink)}}


/* Series colors follow the recommended learning path. */
[data-series="basic"],.book-card[href="#book/basic"],.apple-book-card[href="#discover/basic"],.product-showcase:has(a[href="#book/basic"]),.series-stage:has(a[href="#book/basic"]){--series-start:#3b82f6;--series-end:#22a8b4;--stage-accent:#3b82f6;--headline-gradient:linear-gradient(110deg,#3b82f6,#22a8b4);--intro-headline-gradient:linear-gradient(110deg,#3b82f6,#22a8b4)}
[data-series="essential"],.book-card[href="#book/essential"],.apple-book-card[href="#discover/essential"],.product-showcase:has(a[href="#book/essential"]),.series-stage:has(a[href="#book/essential"]),.book-card[href="#book/essential-2025"],.apple-book-card[href="#discover/essential-2025"],.product-showcase:has(a[href="#book/essential-2025"]),.series-stage:has(a[href="#book/essential-2025"]){--series-start:#6940bf;--series-end:#b940a4;--stage-accent:#6940bf;--headline-gradient:linear-gradient(110deg,#6940bf,#b940a4);--intro-headline-gradient:linear-gradient(110deg,#6940bf,#b940a4)}
[data-series="mcq"],.book-card[href="#book/biology-2022"],.apple-book-card[href="#discover/biology-2022"],.product-showcase:has(a[href="#book/biology-2022"]),.series-stage:has(a[href="#book/biology-2022"]),.book-card[href="#book/biology-2023"],.apple-book-card[href="#discover/biology-2023"],.product-showcase:has(a[href="#book/biology-2023"]),.series-stage:has(a[href="#book/biology-2023"]),.book-card[href="#book/biology-2024"],.apple-book-card[href="#discover/biology-2024"],.product-showcase:has(a[href="#book/biology-2024"]),.series-stage:has(a[href="#book/biology-2024"]){--series-start:#2259a7;--series-end:#1aa795;--stage-accent:#2259a7;--headline-gradient:linear-gradient(110deg,#2259a7,#1aa795);--intro-headline-gradient:linear-gradient(110deg,#2259a7,#1aa795)}

.learning-stage-mini,.learning-guide-stage{--headline-gradient:linear-gradient(110deg,var(--stage-start),var(--stage-end))}
[data-series] .page-top>.eyebrow,[data-series] .study-top .eyebrow,[data-series] .outline-path{color:var(--series-start)}
[data-series] .btn.primary{background:var(--series-start);border-color:var(--series-start)}
[data-series] .round-progress,.book-card .eyebrow{color:var(--series-start,var(--green))}
@supports(background-clip:text) or (-webkit-background-clip:text){[data-series] .study-top h1{background:var(--headline-gradient);background-clip:text;-webkit-background-clip:text;color:transparent;-webkit-text-fill-color:transparent}}


/* Essentials showcases link to discovery pages, not study pages. */
.product-showcase:has(a[href="#discover/essential"]),.product-showcase:has(a[href="#discover/essential-2025"]){--series-start:#6940bf;--series-end:#b940a4;--headline-gradient:linear-gradient(110deg,#6940bf,#b940a4);--intro-headline-gradient:linear-gradient(110deg,#6940bf,#b940a4)}
.product-showcase:has(a[href="#discover/basic"]){--series-start:#3b82f6;--series-end:#22a8b4;--headline-gradient:linear-gradient(110deg,#3b82f6,#22a8b4)}
.product-showcase .showcase-actions .btn.primary{display:inline-flex;visibility:visible;opacity:1;background:var(--series-start,var(--green));border-color:var(--series-start,var(--green));color:#fff;-webkit-text-fill-color:#fff}
.product-showcase .showcase-actions .showcase-secondary{color:var(--series-start,var(--green));border-color:var(--series-start,var(--green));background:transparent;-webkit-text-fill-color:currentColor}
[data-series="essential"] .product-local-nav .btn.primary,[data-series="essential"] .product-start .btn.primary{background:#6940bf;border-color:#6940bf;color:#fff}

.essential-study-links{display:flex;flex-wrap:wrap;gap:12px;margin-top:14px}.essential-study-links .btn{color:#6940bf;border-color:#6940bf;background:transparent;-webkit-text-fill-color:#6940bf}
/* Consistent visible controls, including text-only auth links. */
.access-card .btn.primary,.membership-panel .btn.primary,.account-top-links .btn.primary,.account-actions .btn.primary{display:inline-flex!important;visibility:visible!important;opacity:1;background:var(--series-start,var(--green,#2563eb))!important;border-color:var(--series-start,var(--green,#2563eb))!important;color:#fff!important;-webkit-text-fill-color:#fff!important;background-clip:border-box!important;-webkit-background-clip:border-box!important}
.access-card .btn.ghost,.membership-panel .btn.ghost,.account-top-links .btn.ghost{display:inline-flex;visibility:visible;background:#fff;color:var(--ink,#0f2d4a);border:1px solid #cbd5e1;-webkit-text-fill-color:var(--ink,#0f2d4a)}
.reset-progress{border-color:#d6a4a4;color:#a13939;background:#fff}.reset-progress:disabled{opacity:.45;cursor:not-allowed}
#mainnav>a,#mainnav>a>span{font-size:14px!important;font-weight:500;line-height:1.5}
@media(max-width:700px){.product-showcase .showcase-actions,.product-showcase .essential-study-links{display:flex;justify-content:center;align-items:center;flex-wrap:wrap;gap:12px;width:100%;margin-left:auto;margin-right:auto}.product-showcase .showcase-actions .btn,.product-showcase .essential-study-links .btn{margin:0;flex:0 1 auto;text-align:center;justify-content:center}.product-showcase .showcase-editions{justify-content:center}.chips{flex-wrap:wrap}#mainnav>a,#mainnav>a>span{font-size:15px!important}}

/* Flexible progress layout for iPad portrait, landscape and Split View. */
.learning-panel-head,.learning-total,.learning-stage-heading,.learning-book{min-width:0;flex-wrap:wrap}.learning-guide-books{grid-template-columns:repeat(2,minmax(0,1fr))}.learning-book>div{min-width:0;flex:1}.learning-book h3,.learning-book p,.learning-stage-heading h2,.learning-panel-head h2{overflow-wrap:anywhere;word-break:keep-all}.learning-book .learning-link{line-height:1.8;margin-top:8px}.learning-stage-heading>div{flex:1;min-width:180px}.learning-total>div{min-width:0}.learning-stage-mini{min-width:0}.learning-stage-mini b{overflow-wrap:anywhere}.learning-home-panel,.learning-guide-stage{min-width:0;max-width:100%;box-sizing:border-box}
@media(min-width:701px) and (max-width:1180px){.learning-guide-books{grid-template-columns:1fr}.learning-panel-head{align-items:flex-start}.learning-total{gap:18px}.learning-total>.btn{margin-left:0}.learning-stage-progress{gap:10px}.learning-stage-mini{padding:16px}.learning-guide-stage{padding:24px}.learning-book{flex-wrap:nowrap}.learning-stage-heading{gap:16px}.learning-stage-state{margin-left:0}}
@media(max-width:700px){.learning-guide-books{grid-template-columns:1fr}.learning-stage-progress{grid-template-columns:1fr}.learning-book{flex-wrap:nowrap}.learning-stage-heading>div{min-width:0}.learning-total>.btn{margin-left:0}}
.operator-part-tabs{display:flex;gap:10px;overflow-x:auto;margin:20px 0;padding:4px 0 10px}.operator-part-tab{flex:1 0 150px;min-width:0;border:1px solid var(--line,#dce5ee);border-radius:16px;background:#fff;color:var(--ink,#0f2d4a);padding:16px;text-align:left}.operator-part-tab>span{display:block;font-size:17px;font-weight:700;color:var(--part-start,#2678c7)}.operator-part-tab>strong{display:block;font-size:13px;font-weight:500;margin-top:8px;line-height:1.6}.operator-part-tab.is-active{border:2px solid var(--part-start,#2678c7);background:color-mix(in srgb,var(--part-start,#2678c7) 6%,white)}.operator-round-controls{display:flex;align-items:center;justify-content:space-between;gap:12px;margin:20px 0;flex-wrap:wrap}.operator-round-controls>span{font-size:15px;color:var(--muted,#63758a)}

/* Online service wordmark; printed book cover artwork retains the SIMPLICITY brand. */
.service-one{display:inline-block;font-size:.85em;letter-spacing:.06em;font-weight:650;margin-left:.15em;color:var(--gradient-middle,#2eb7c7);-webkit-text-fill-color:var(--gradient-middle,#2eb7c7)}.identity-wordmark b{white-space:nowrap}.identity-story-wordmark{letter-spacing:.13em}.identity-story-wordmark .service-one{font-size:.85em}.identity-brand .identity-wordmark b{font-size:clamp(13px,1.3vw,18px)}
@supports(background-clip:text) or (-webkit-background-clip:text){[data-series="essential"] .page-top h1,[data-series="mcq"] .page-top h1,[data-series="essential"] .part-summary h2,[data-series="essential"] .part-label,[data-series="essential"] .part-index,[data-series="essential"] .part-tab-title,[data-series="essential"] .round-title,[data-series="mcq"] .round-title{background-image:var(--headline-gradient);background-clip:text;-webkit-background-clip:text;color:transparent;-webkit-text-fill-color:transparent}}
@media(max-width:700px){.identity-brand .identity-wordmark b{font-size:14px;letter-spacing:.15em}.identity-story-wordmark{font-size:25px;letter-spacing:.1em}.identity-lockup{gap:12px}}

/* ONE shares the exact typography and color of the surrounding wordmark. */
.service-one,.identity-story-wordmark .service-one{font-size:inherit!important;font-weight:inherit!important;letter-spacing:inherit!important;color:inherit!important;-webkit-text-fill-color:inherit!important;margin-left:0}

/* All three multiple-choice volumes share the series banner. */
.showcase-art.has-trio .showcase-covers{display:flex;justify-content:center;align-items:center;flex-wrap:nowrap;gap:16px;width:100%;padding:0;inset:auto;position:relative}
.showcase-art.has-trio .showcase-covers .showcase-cover{width:calc((100% - 32px)/3)!important;max-width:180px;flex:0 1 auto;min-width:0;transform:none!important;margin:0!important;height:auto}
.showcase-art.has-trio .showcase-cover .object-cover-image{width:100%;height:auto;display:block;object-fit:contain}
@media(max-width:700px){.showcase-art.has-trio .showcase-covers{gap:8px}.showcase-art.has-trio .showcase-covers .showcase-cover{width:calc((100% - 16px)/3)!important;max-width:150px}}

/* Book identity and part identity are independent. */
[data-series] .basic-part-tabs .part-index,[data-series] .book-part-content .part-summary h2,[data-series] .book-part-content .part-label,[data-series] .course-part-grid .part-index{background-image:linear-gradient(110deg,var(--part-start),var(--part-end))!important;background-clip:text;-webkit-background-clip:text;color:transparent;-webkit-text-fill-color:transparent}
[data-series] .basic-part-tabs .part-tab-title{background:none!important;color:var(--text,#1d1d1f)!important;-webkit-text-fill-color:var(--text,#1d1d1f)!important}
.book-resume-actions{margin:24px 0 32px}.book-resume-actions .btn.primary{background:var(--series-start,var(--green));color:#fff;-webkit-text-fill-color:#fff}

.book-card[data-series=basic]{--card-start:#3b82f6;--card-end:#22a8b4}.book-card[data-series=essential]{--card-start:#6940bf;--card-end:#b940a4}.book-card[data-series=mcq]{--card-start:#2259a7;--card-end:#1aa795}
.book-card[data-series] .book-info h3,.book-card[data-series] .book-info .eyebrow{background-image:linear-gradient(110deg,var(--card-start),var(--card-end))!important;background-clip:text;-webkit-background-clip:text;color:transparent!important;-webkit-text-fill-color:transparent!important}
.book-card[data-series] .book-cover{background:linear-gradient(140deg,color-mix(in srgb,var(--card-start) 9%,white),color-mix(in srgb,var(--card-end) 9%,white))!important}
.daily-home-panel{max-width:1180px;margin:28px auto;display:flex;align-items:center;justify-content:space-between;gap:24px;padding:28px 34px;border:1px solid var(--line,#dce5ee);border-radius:20px;background:var(--surface,#fff)}.daily-home-panel h2{font-size:24px;margin:0 0 7px;line-height:1.3}.daily-home-panel p{font-size:14px;color:var(--muted);margin:0;line-height:1.6}.daily-home-panel .btn.primary,.daily-summary .btn.primary{background:#2563eb!important;color:#fff!important;-webkit-text-fill-color:#fff!important;white-space:nowrap}.daily-summary{margin:24px 0 32px}.daily-summary p{line-height:1.8;color:var(--muted)}
@media(max-width:1250px){.daily-home-panel{margin:24px 24px}}@media(max-width:600px){.daily-home-panel{margin:20px 16px;padding:22px 20px;gap:18px;flex-wrap:wrap}.daily-home-panel h2{font-size:22px}.daily-home-panel p{font-size:12px}.daily-home-panel .btn{margin-left:auto}}