:root { --ink:#17212B; --ink-soft:#233746; --paper:#F3EFE7; --paper-deep:#E8E0D2; --brass:#B98536; --pine:#2F6B59; --brick:#B5483E; --line:rgba(23,33,43,.16); --muted:#6A716F; --white:#FFFCF6; --serif:"Noto Serif SC","Songti SC",STSong,serif; --sans:"Noto Sans SC","Microsoft YaHei",sans-serif; }
* { box-sizing:border-box; }
body { margin:0; min-width:320px; color:var(--ink); background:var(--paper); font-family:var(--sans); }
button { font:inherit; cursor:pointer; }
button:focus-visible, a:focus-visible { outline:3px solid var(--brass); outline-offset:3px; }
.shell { width:min(1180px,calc(100% - 32px)); margin:0 auto; padding:28px 0 64px; }
.topbar { display:flex; align-items:center; justify-content:space-between; gap:20px; padding-bottom:24px; }
.brand { display:flex; align-items:center; gap:11px; padding:0; border:0; color:var(--ink); text-decoration:none; font-weight:800; letter-spacing:.04em; background:transparent; }
.brand-mark { display:grid; place-items:center; width:34px; height:34px; color:var(--paper); background:var(--ink); clip-path:polygon(50% 0, 100% 28%, 84% 100%, 16% 100%, 0 28%); }
.brand-mark svg { width:18px; }
.top-link, .text-button { border:0; background:transparent; color:var(--muted); text-decoration:none; font-size:14px; }
.top-link:hover, .text-button:hover { color:var(--ink); }
.catalog-summary { display:grid; grid-template-columns:minmax(0,1.2fr) minmax(290px,.8fr); gap:30px; align-items:end; padding:34px 0 32px; border-bottom:1px solid var(--line); }
.catalog-summary h1 { margin:0; font-size:clamp(34px,5vw,58px); line-height:1.12; }
.catalog-summary p:not(.eyebrow) { max-width:490px; margin:14px 0 0; color:var(--muted); font-size:14px; line-height:1.8; }
.catalog-summary dl { display:flex; justify-content:flex-end; gap:24px; margin:0; }
.catalog-summary dl div { min-width:72px; padding-left:15px; border-left:1px solid var(--line); }
.catalog-summary dt { color:var(--ink); font-family:var(--serif); font-size:30px; font-weight:800; }
.catalog-summary dd { margin:4px 0 0; color:var(--muted); font-size:12px; }
.review-entry { display:flex; align-items:center; justify-content:space-between; gap:20px; margin-top:26px; padding:22px 24px; border-left:4px solid var(--brick); background:var(--white); }
.review-entry h2 { margin:0; font-size:25px; }
.review-entry p:not(.eyebrow) { margin:6px 0 0; color:var(--muted); font-size:14px; }
.review-head { padding:34px 0 26px; border-bottom:1px solid var(--line); }
.review-head h1 { margin:0; font-size:clamp(36px,5vw,58px); }
.review-head > p:not(.eyebrow) { margin:12px 0 0; color:var(--muted); line-height:1.8; }
.review-filters { display:flex; gap:8px; margin-top:24px; }
.review-filters button { min-height:38px; padding:0 15px; border:1px solid var(--line); color:var(--muted); background:transparent; }
.review-filters button.active { border-color:var(--ink); color:var(--paper); background:var(--ink); }
.review-papers { display:grid; gap:12px; margin-top:28px; }
.review-paper { display:flex; align-items:center; justify-content:space-between; gap:24px; padding:24px; border:1px solid var(--line); background:var(--white); }
.review-paper h2 { margin:0; font-size:22px; }
.review-paper p:not(.eyebrow) { margin:8px 0 0; color:var(--muted); font-size:14px; }
.hero { position:relative; overflow:hidden; min-height:300px; padding:clamp(32px,6vw,76px); color:var(--paper); background:var(--ink); }
.hero::after { content:""; position:absolute; right:-12%; bottom:-66%; width:min(580px,70vw); aspect-ratio:1; border:1px solid rgba(243,239,231,.32); border-radius:50%; box-shadow:0 0 0 38px rgba(243,239,231,.05),0 0 0 76px rgba(243,239,231,.035); }
.eyebrow { margin:0 0 12px; color:#D6B77A; font-size:12px; font-weight:800; letter-spacing:.18em; }
h1,h2,h3 { font-family:var(--serif); }
.hero h1 { position:relative; z-index:1; max-width:700px; margin:0; font-size:clamp(38px,7vw,72px); line-height:1.08; letter-spacing:-.05em; }
.hero p:not(.eyebrow) { position:relative; z-index:1; max-width:520px; margin:22px 0 0; color:rgba(243,239,231,.76); line-height:1.8; }
.hero-stats { position:absolute; z-index:1; right:clamp(22px,5vw,68px); bottom:34px; display:flex; gap:26px; color:#D6B77A; }
.hero-stats b { display:block; color:var(--paper); font-family:var(--serif); font-size:25px; }
.hero-stats span { font-size:12px; }
.course-overview { display:grid; grid-template-columns:minmax(220px,.62fr) minmax(0,1.38fr); gap:42px; margin-top:42px; }
.section-intro { padding:14px 0 0; }
.section-intro h2 { margin:0; font-size:31px; line-height:1.25; }
.section-intro p { color:var(--muted); font-size:14px; line-height:1.9; }
.course-list { display:grid; gap:14px; }
.course-card { position:relative; overflow:hidden; padding:26px 28px; border:1px solid var(--line); background:var(--white); transition:transform .2s ease,box-shadow .2s ease; }
.course-card:hover { transform:translateY(-3px); box-shadow:0 16px 30px rgba(23,33,43,.12); }
.course-card::before { content:""; position:absolute; top:0; right:0; width:86px; height:86px; background:var(--paper-deep); clip-path:polygon(100% 0,0 0,100% 100%); }
.course-card h3 { margin:0 0 8px; font-size:25px; }
.course-card p { margin:0; color:var(--muted); font-size:14px; }
.card-footer { display:flex; align-items:center; justify-content:space-between; gap:12px; margin-top:20px; }
.count { color:var(--brass); font-size:13px; font-weight:800; }
.primary, .secondary { min-height:44px; padding:0 18px; border-radius:0; font-weight:800; transition:transform .15s ease,background .15s ease; }
.primary { border:1px solid var(--ink); color:var(--paper); background:var(--ink); }
.primary:hover { background:var(--ink-soft); transform:translateY(-1px); }
.secondary { border:1px solid var(--line); color:var(--ink); background:transparent; }
.secondary:hover { border-color:var(--ink); background:var(--paper-deep); }
.course-head { display:grid; grid-template-columns:.7fr 1.3fr; align-items:end; gap:34px; padding:30px 0 28px; border-bottom:1px solid var(--line); }
.course-head h1 { margin:0; font-size:clamp(34px,5vw,58px); line-height:1.08; }
.course-head p { margin:0; color:var(--muted); line-height:1.8; }
.course-tools { display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:10px; margin-top:22px; }
.course-tools button { display:flex; align-items:baseline; justify-content:space-between; min-height:66px; padding:14px 18px; border:1px solid var(--line); color:var(--ink); text-align:left; background:var(--white); }
.course-tools button:hover { border-color:var(--brass); background:var(--paper-deep); }
.course-tools strong { color:var(--brass); font-family:var(--serif); font-size:27px; }
.course-tools span { color:var(--muted); font-size:14px; font-weight:800; }
.group { margin-top:42px; }
.group-heading { display:flex; justify-content:space-between; align-items:baseline; margin-bottom:14px; }
.group-heading h2 { margin:0; font-size:27px; }
.group-heading span { color:var(--muted); font-size:13px; }
.paper-list { display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:12px; }
.paper { display:grid; grid-template-columns:1fr auto; gap:14px; align-items:center; min-height:128px; padding:22px; border:1px solid var(--line); background:var(--white); }
.paper h3 { margin:0; font-size:18px; line-height:1.45; }
.paper p { margin:8px 0 0; color:var(--muted); font-size:13px; }
.paper-actions { display:grid; gap:8px; }
.paper-actions button { min-width:88px; }
.study { min-height:100vh; color:var(--paper); background:var(--ink); }
.study-shell { width:min(1260px,calc(100% - 28px)); margin:0 auto; padding:22px 0 102px; }
.study-top { display:flex; align-items:center; justify-content:space-between; gap:12px; margin-bottom:26px; }
.study-top button { color:rgba(243,239,231,.75); }
.study-meta { color:rgba(243,239,231,.7); font-size:13px; }
.study-top > :first-child, .study-top > :last-child { flex:0 0 72px; }
.study-top > :last-child { display:grid; justify-content:end; }
.study-meta { overflow:hidden; text-align:center; white-space:nowrap; text-overflow:ellipsis; }
.header-icon { display:grid; place-items:center; width:38px; height:38px; padding:0; border:1px solid transparent; color:rgba(243,239,231,.76); background:transparent; }
.header-icon svg { width:21px; height:21px; }
.header-icon:hover, .header-icon.is-bookmarked { border-color:rgba(243,239,231,.34); color:var(--brass); }
.single-question { display:grid; min-height:calc(100vh - 170px); place-items:start center; }
.single-question .question-sheet { width:min(850px,100%); min-height:0; margin-bottom:86px; }
.study-layout { display:grid; grid-template-columns:minmax(0,1fr) 250px; gap:24px; align-items:start; }
.question-sheet { position:relative; min-height:570px; padding:clamp(25px,4vw,54px); color:var(--ink); background:var(--paper); }
.question-sheet::before { content:""; position:absolute; top:0; left:0; width:48px; height:48px; pointer-events:none; background:var(--brass); clip-path:polygon(0 0,100% 0,0 100%); }
.question-type { position:relative; z-index:1; display:inline-block; margin:8px 0 24px; color:var(--brass); font-size:12px; font-weight:800; letter-spacing:.14em; }
.question-title { margin:0; font-family:var(--serif); font-size:clamp(22px,3vw,31px); line-height:1.55; }
.option-list { display:grid; gap:10px; margin-top:34px; }
.option { display:flex; align-items:flex-start; gap:14px; width:100%; min-height:58px; padding:15px 16px; border:1px solid var(--line); color:var(--ink); text-align:left; background:rgba(255,252,246,.72); transition:border-color .16s ease,transform .16s ease; }
.option:hover { border-color:var(--brass); transform:translateX(3px); }
.option-letter { display:grid; flex:0 0 auto; place-items:center; width:27px; height:27px; border:1px solid currentColor; border-radius:50%; font-size:13px; font-weight:800; }
.option.selected { border-color:var(--ink); color:var(--paper); background:var(--ink); }
.option.correct { border-color:var(--pine); color:#153E32; background:#DCEBE3; }
.option.wrong { border-color:var(--brick); color:#6F1E1A; background:#F3DCD8; }
.explanation { margin-top:24px; padding:20px; border-left:4px solid var(--brass); color:var(--ink); background:#E8E0D2; line-height:1.8; }
.explanation strong { display:block; margin-bottom:8px; }
.answer-sheet { padding:20px; border:1px solid rgba(243,239,231,.18); background:rgba(255,255,255,.055); }
.answer-sheet h2 { margin:0; font-size:22px; }
.answer-sheet p { margin:6px 0 18px; color:rgba(243,239,231,.65); font-size:12px; }
.answer-grid { display:grid; grid-template-columns:repeat(5,1fr); gap:7px; }
.answer-grid button { aspect-ratio:1; border:1px solid rgba(243,239,231,.24); color:rgba(243,239,231,.85); background:transparent; font-size:12px; }
.answer-grid button.active { border-color:var(--brass); color:var(--ink); background:var(--brass); }
.answer-grid button.done { background:rgba(243,239,231,.24); }
.study-actions { position:fixed; z-index:3; right:0; bottom:0; left:0; display:flex; justify-content:center; gap:10px; padding:14px; border-top:1px solid rgba(243,239,231,.15); background:rgba(23,33,43,.94); backdrop-filter:blur(12px); }
.study-actions .primary { border-color:var(--brass); background:var(--brass); color:var(--ink); }
.nav-button, .question-list-button { min-width:100px; min-height:46px; border:1px solid rgba(243,239,231,.3); color:var(--paper); font-weight:800; background:transparent; }
.nav-button:hover { border-color:var(--brass); color:var(--brass); }
.nav-button.next { border-color:var(--brass); color:var(--ink); background:var(--brass); }
.nav-button:disabled { opacity:.35; cursor:not-allowed; }
.question-list-button { display:flex; align-items:center; justify-content:center; gap:8px; min-width:58px; color:var(--brass); }
.question-list-button svg { width:21px; height:21px; }
.question-list-button:hover { background:rgba(243,239,231,.08); }
.question-picker-backdrop { position:fixed; z-index:8; inset:0; display:grid; place-items:end center; padding:18px; background:rgba(9,15,20,.7); backdrop-filter:blur(4px); }
.question-picker { width:min(630px,100%); max-height:min(78vh,680px); overflow:auto; padding:26px; color:var(--ink); background:var(--paper); box-shadow:0 -16px 48px rgba(0,0,0,.28); }
.question-picker header { display:flex; align-items:start; justify-content:space-between; gap:16px; }
.question-picker h2 { margin:0; font-size:28px; }
.question-picker header p:not(.eyebrow) { margin:6px 0 0; color:var(--muted); font-size:13px; }
.picker-close { display:grid; place-items:center; width:38px; height:38px; border:1px solid var(--line); color:var(--ink); font-size:25px; line-height:1; background:transparent; }
.picker-legend { display:flex; flex-wrap:wrap; gap:16px; margin:22px 0 16px; color:var(--muted); font-size:12px; }
.picker-legend span { display:flex; align-items:center; gap:6px; }
.picker-legend i { width:10px; height:10px; border:1px solid var(--line); background:var(--white); }
.picker-legend i.current { border-color:var(--brass); background:var(--brass); }
.picker-legend i.done { border-color:var(--pine); background:var(--pine); }
.picker-legend i.bookmarked { border-color:var(--brick); background:var(--brick); }
.picker-grid { display:grid; grid-template-columns:repeat(10,1fr); gap:8px; }
.picker-grid button { aspect-ratio:1; border:1px solid var(--line); color:var(--ink); background:var(--white); font-size:12px; }
.picker-grid button.done { border-color:var(--pine); color:#fff; background:var(--pine); }
.picker-grid button.bookmarked { box-shadow:inset 0 -3px 0 var(--brick); }
.picker-grid button.active { border-color:var(--brass); color:var(--ink); background:var(--brass); box-shadow:none; }
.submit-multi { margin-top:20px; }
.result { padding:clamp(36px,7vw,90px) 0; }
.result-card { position:relative; overflow:hidden; padding:clamp(28px,6vw,70px); color:var(--paper); background:var(--ink); }
.result-card::after { content:""; position:absolute; right:-90px; top:-100px; width:310px; height:310px; border:1px solid rgba(243,239,231,.25); border-radius:50%; }
.result-card h1 { position:relative; z-index:1; margin:0; font-size:clamp(40px,7vw,76px); }
.result-card p { position:relative; z-index:1; color:rgba(243,239,231,.7); }
.score { position:relative; z-index:1; margin:32px 0; font-family:var(--serif); font-size:clamp(70px,14vw,150px); color:#D6B77A; line-height:.8; }
.result-summary { display:flex; flex-wrap:wrap; gap:16px; position:relative; z-index:1; }
.result-summary div { min-width:120px; padding:14px 16px; border-left:1px solid rgba(243,239,231,.28); }
.result-summary b { display:block; font-size:24px; }
.result-summary span { color:rgba(243,239,231,.66); font-size:12px; }
.result-actions { display:flex; flex-wrap:wrap; gap:10px; margin-top:24px; }
.empty { padding:80px 20px; color:var(--muted); text-align:center; }
.loading { display:grid; place-items:center; min-height:55vh; color:var(--muted); }
@media (max-width:760px) { .shell{width:min(100% - 22px,680px);padding-top:16px}.catalog-summary{grid-template-columns:1fr;gap:24px;padding:26px 0}.catalog-summary dl{justify-content:flex-start;gap:14px}.catalog-summary dl div{min-width:70px;padding-left:12px}.review-entry,.review-paper{align-items:flex-start;flex-direction:column}.hero{min-height:340px;padding:34px 24px}.hero-stats{right:24px;bottom:26px;gap:16px}.course-overview,.course-head{grid-template-columns:1fr;gap:20px}.course-tools{margin-top:16px}.paper-list{grid-template-columns:1fr}.paper{grid-template-columns:1fr}.paper-actions{grid-template-columns:1fr 1fr}.study-shell{width:min(100% - 20px,680px);padding-top:12px}.study-top{margin-bottom:14px}.study-top > :first-child,.study-top > :last-child{flex-basis:52px}.question-sheet{min-height:calc(100vh - 175px);padding:34px 22px}.single-question{min-height:calc(100vh - 145px)}.option{min-height:54px}.question-picker-backdrop{padding:0}.question-picker{max-height:84vh;padding:22px 16px 30px}.picker-grid{grid-template-columns:repeat(8,1fr)}.nav-button{min-width:92px}.result{padding:20px 0}.top-link{font-size:13px} }