:root{--crimson:oklch(45% 0.15 22);--crimson-bright:oklch(55% 0.19 22);--crimson-soft:oklch(94% 0.04 22);--gold:oklch(68% 0.11 75);--bg:oklch(98.5% 0.006 80);--surface:oklch(100% 0 0);--surface-2:oklch(97% 0.008 80);--ink:oklch(22% 0.012 50);--ink-soft:oklch(44% 0.012 50);--ink-faint:oklch(62% 0.01 50);--line:oklch(89% 0.008 60);--line-strong:oklch(82% 0.01 60);--ok:oklch(58% 0.13 150);--ok-soft:oklch(95% 0.04 150);--bad:oklch(55% 0.18 25);--bad-soft:oklch(95% 0.04 25);--text-xs:0.78rem;--text-sm:0.875rem;--text-base:1rem;--text-lg:1.15rem;--text-xl:clamp(1.3rem,1.1rem + 1vw,1.6rem);--text-2xl:clamp(1.7rem,1.3rem + 2vw,2.4rem);--display:clamp(2.6rem,1.6rem + 5vw,5rem);--serif:"Songti SC","Noto Serif SC",Georgia,"Times New Roman",serif;--sans:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Segoe UI",Roboto,sans-serif;--mono:"SF Mono","JetBrains Mono","Fira Code",Menlo,monospace;--radius:14px;--radius-sm:9px;--space-section:clamp(3rem,2rem + 5vw,6rem);--shadow-card:0 1px 2px oklch(22% 0.012 50/0.04),0 8px 28px -12px oklch(22% 0.012 50/0.16);--shadow-lift:0 4px 10px oklch(22% 0.012 50/0.08),0 18px 44px -16px oklch(22% 0.012 50/0.22);--dur:220ms;--ease:cubic-bezier(0.16,1,0.3,1)}*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}body{margin:0;font-family:var(--sans);font-size:var(--text-base);line-height:1.65;color:var(--ink);background:var(--bg);background-image:radial-gradient(120% 80% at 100% 0,var(--crimson-soft),transparent 55%),radial-gradient(90% 70% at 0 5%,oklch(96% .03 75/.7),transparent 50%);background-attachment:fixed;min-height:100dvh}@media 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.mark{display:grid;place-items:center;width:30px;height:30px;border-radius:8px;background:linear-gradient(135deg,var(--crimson),var(--crimson-bright));color:#fff;font-family:var(--serif);font-weight:700}.nav{display:flex;gap:22px;align-items:center;font-size:var(--text-sm)}.nav a{color:var(--ink-soft);font-weight:600}.nav a:hover{color:var(--crimson)}.site-footer{border-top:1px solid var(--line);margin-top:var(--space-section);padding:28px 0;color:var(--ink-faint);font-size:var(--text-sm)}.site-footer .wrap{display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px}.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow-card)}.btn{display:inline-flex;align-items:center;gap:8px;padding:11px 20px;border-radius:999px;font-weight:700;font-size:var(--text-sm);border:1px solid transparent;cursor:pointer;transition:transform var(--dur) var(--ease),box-shadow var(--dur) var(--ease),background var(--dur) var(--ease)}.btn-primary{background:linear-gradient(135deg,var(--crimson),var(--crimson-bright));color:#fff;box-shadow:0 6px 18px -8px var(--crimson)}.btn-primary:hover{transform:translateY(-2px);box-shadow:0 12px 26px -10px var(--crimson);color:#fff}.btn-ghost{background:var(--surface);border-color:var(--line-strong);color:var(--ink)}.btn-ghost:hover{border-color:var(--crimson);color:var(--crimson);transform:translateY(-1px)}.btn:disabled{opacity:.5;cursor:not-allowed;transform:none}.tag{display:inline-flex;align-items:center;gap:5px;padding:3px 10px;font-size:var(--text-xs);font-weight:700;background:var(--crimson-soft);color:var(--crimson)}.chip,.tag{border-radius:999px}.chip{padding:4px 11px;border:1px solid var(--line-strong);background:var(--surface);font-size:var(--text-sm);font-weight:600;color:var(--ink-soft);cursor:pointer;transition:all var(--dur) var(--ease)}.chip[data-active=true]{background:var(--crimson);color:#fff}.chip:hover,.chip[data-active=true]{border-color:var(--crimson)}.hero{padding:clamp(3rem,2rem + 6vw,7rem) 0 clamp(2rem,1rem + 4vw,4rem)}.hero h1{font-family:var(--serif);font-size:var(--display);line-height:1.02;letter-spacing:-.02em;margin:16px 0 0;color:var(--ink)}.hero h1 em{font-style:normal;color:var(--crimson)}.hero p.lede{font-size:var(--text-xl);color:var(--ink-soft);max-width:36ch;margin:22px 0 30px}.course-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(290px,1fr));grid-gap:20px;gap:20px;margin-top:26px}.course-card{display:flex;flex-direction:column;padding:24px;position:relative;overflow:hidden;transition:transform var(--dur) var(--ease),box-shadow var(--dur) var(--ease)}.course-card.live:hover{transform:translateY(-4px);box-shadow:var(--shadow-lift)}.course-card .spine{position:absolute;inset:0 auto 0 0;width:5px;background:linear-gradient(var(--crimson),var(--gold))}.course-card h3{font-family:var(--serif);font-size:var(--text-2xl);margin:12px 0 6px;letter-spacing:-.01em}.course-card .org{font-size:var(--text-xs);color:var(--ink-faint);font-weight:600}.course-card p{color:var(--ink-soft);font-size:var(--text-sm);flex:1 1}.course-card .foot{display:flex;align-items:center;gap:10px;margin-top:16px;flex-wrap:wrap}.course-card.soon{opacity:.72;border-style:dashed;box-shadow:none}.course-card.soon .spine{background:var(--line-strong)}.course-head{padding:clamp(2.4rem,1.6rem + 4vw,4rem) 0 1.5rem}.course-head h1{font-family:var(--serif);font-size:var(--text-2xl);margin:10px 0 8px;letter-spacing:-.01em}.feature-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));grid-gap:20px;gap:20px;margin:28px 0}.feature{display:flex;flex-direction:column;padding:28px;transition:transform var(--dur) var(--ease),box-shadow var(--dur) 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li{display:flex;gap:14px;align-items:baseline;padding:12px 16px;border:1px solid var(--line);border-radius:var(--radius-sm);background:var(--surface)}.chapter-list .num{font-family:var(--serif);font-weight:700;color:var(--crimson);min-width:1.6em}.chapter-list .blurb{color:var(--ink-faint);font-size:var(--text-sm)}.md{line-height:1.7}.md>:first-child{margin-top:0}.md>:last-child{margin-bottom:0}.md p{margin:.5em 0}.md code{font-family:var(--mono);font-size:.9em;background:var(--surface-2);padding:1px 6px;border-radius:6px}.md pre{background:oklch(24% .012 50);color:oklch(95% .01 80);padding:14px 16px;border-radius:var(--radius-sm);overflow-x:auto}.md pre code{background:none;color:inherit;padding:0}.md ol,.md ul{padding-left:1.3em;margin:.5em 0}.md table{border-collapse:collapse;width:100%;font-size:var(--text-sm)}.md td,.md th{border:1px solid var(--line);padding:6px 10px;text-align:left}.md 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var(--ease)}.quiz-card{padding:26px}.qmeta{display:flex;align-items:center;gap:10px;font-size:var(--text-sm);margin-bottom:12px;flex-wrap:wrap}.stem{font-size:var(--text-lg);font-weight:600;margin-bottom:18px}.opts{list-style:none;padding:0;margin:0;display:grid;grid-gap:10px;gap:10px}.opt{display:flex;gap:12px;align-items:flex-start;padding:13px 16px;border:1.5px solid var(--line-strong);border-radius:var(--radius-sm);background:var(--surface);cursor:pointer;transition:border-color var(--dur) var(--ease),background var(--dur) var(--ease),transform var(--dur) var(--ease)}.opt:hover{border-color:var(--crimson);transform:translateX(2px)}.opt-mark{flex:none;width:26px;height:26px;border-radius:7px;display:grid;place-items:center;font-weight:700;font-size:var(--text-sm);background:var(--surface-2);color:var(--ink-soft)}.opt-text{flex:1 1}.opt-text .md{line-height:1.5}.opt[data-state=selected]{border-color:var(--crimson);background:var(--crimson-soft)}.opt[data-state=selected] 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.explain{margin-top:8px;font-size:var(--text-sm);color:var(--ink-soft)}.ans-line{margin:6px 0;font-size:var(--text-sm)}.quiz-actions{display:flex;align-items:center;gap:12px;margin-top:20px}.quiz-kbd-hint{order:-1;margin-right:auto;font-size:var(--text-xs)}@media (max-width:480px){.quiz-kbd-hint{display:none}}.quiz-summary{padding:28px;display:flex;gap:26px;align-items:center;flex-wrap:wrap}.score-ring{flex:none;width:108px;height:108px;border-radius:50%;display:grid;place-items:center;color:#fff;background:conic-gradient(var(--crimson),var(--gold))}.score-ring[data-tier=mid]{background:conic-gradient(var(--gold),oklch(72% .12 60))}.score-ring[data-tier=low]{background:conic-gradient(var(--bad),oklch(62% .16 30))}.score-ring .pct{font-size:2.4rem;font-weight:800;font-family:var(--serif);line-height:1}.score-ring .unit{font-size:var(--text-xs);opacity:.85}.review-item{padding:18px 20px;margin-top:12px}.review-item details{margin-top:8px}.review-item 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infinite}.orb-wrap.thinking .orb{animation:orb-breathe 2s ease-in-out infinite}.status-pill{font-size:var(--text-sm);font-weight:700;padding:4px 14px;border-radius:999px;background:var(--surface-2);color:var(--ink-soft);border:1px solid var(--line)}.status-pill.s-thinking{color:var(--crimson);border-color:var(--crimson);background:var(--crimson-soft)}.status-pill.s-speaking{color:oklch(48% .12 58);border-color:var(--gold);background:oklch(96% .04 75)}.status-pill.s-error{color:var(--bad);border-color:var(--bad);background:var(--bad-soft)}.caption{min-height:5.2em;max-width:46ch;text-align:center;font-size:var(--text-lg);line-height:1.7;color:var(--ink);font-family:var(--serif)}.cap-said{color:var(--crimson)}.cap-rest{color:var(--ink-faint)}.caption-user{color:var(--ink-soft);font-style:italic;font-family:var(--sans)}.voice-error{color:var(--bad);font-size:var(--text-sm)}.suggest-row{display:flex;flex-wrap:wrap;gap:8px;justify-content:center}.voice-text{display:flex;gap:8px;width:100%;max-width:480px}.voice-text input{flex:1 1;padding:11px 16px;border:1.5px solid var(--line-strong);border-radius:999px;font:inherit;background:var(--bg)}.voice-text input:focus{outline:none;border-color:var(--crimson)}.mini-log{width:100%;max-height:180px;overflow-y:auto;display:flex;flex-direction:column;gap:8px;border-top:1px solid var(--line);padding-top:14px}.log-line{display:flex;gap:10px;font-size:var(--text-sm)}.log-line .who{flex:none;font-weight:700;width:2.4em;color:var(--ink-faint)}.log-line.user .who{color:var(--crimson)}.kp-panel{padding:26px 28px 32px;min-height:540px}.kp-note .md>:last-child{margin-bottom:0}.kp-head{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:10px}.kp-head h2{font-family:var(--serif);font-size:var(--text-xl);margin:0}.kp-formulas{background:var(--surface-2);border:1px solid var(--line);border-radius:var(--radius-sm);padding:10px 14px;margin-bottom:12px;overflow-x:auto}.kp-figurehint{color:var(--ink-faint);border-left:3px solid var(--gold);padding-left:10px;margin:10px 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var(--ease)}.voice-ctl:hover{border-color:var(--crimson);background:var(--crimson-soft)}.voice-ctl.rate{font-feature-settings:"tnum";font-variant-numeric:tabular-nums}.voice-ctl.stop{color:var(--bad);border-color:var(--bad);background:var(--bad-soft)}.voice-ctl.stop:hover{background:var(--bad);color:#fff}.kp-empty-mark{box-shadow:0 10px 28px -10px var(--crimson)}.graph-wrap{position:relative;height:min(74vh,680px);margin-top:16px;border:1px solid var(--line);border-radius:var(--radius);background:radial-gradient(circle at 50% 42%,#ffffff,var(--bg) 75%);overflow:hidden;box-shadow:var(--shadow-card)}.graph-canvas{width:100%;height:100%;display:block;cursor:-webkit-grab;cursor:grab;touch-action:none}.graph-loading{position:absolute;inset:0;display:grid;place-items:center;color:var(--ink-faint)}.graph-legend{position:absolute;top:14px;left:14px;display:flex;flex-wrap:wrap;gap:6px 12px;background:oklch(100% 0 0/.82);-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);border:1px solid var(--line);border-radius:10px;padding:8px 12px;font-size:var(--text-xs);max-width:72%}.graph-legend .leg{display:inline-flex;align-items:center;gap:5px;color:var(--ink-soft);font-weight:600}.graph-legend .dot{width:9px;height:9px;border-radius:50%}.graph-tip{top:14px;right:14px;background:var(--crimson);color:#fff;padding:6px 14px;font-size:var(--text-sm);font-weight:700;box-shadow:var(--shadow-card);max-width:46%;overflow:hidden;text-overflow:ellipsis}.graph-hint,.graph-tip{position:absolute;border-radius:999px;white-space:nowrap}.graph-hint{bottom:12px;left:50%;transform:translateX(-50%);font-size:var(--text-xs);background:oklch(100% 0 0/.72);padding:4px 12px}.graph-detail{position:absolute;top:0;right:0;width:min(440px,88%);height:100%;background:var(--surface);border-left:1px solid var(--line);box-shadow:-10px 0 40px -16px oklch(22% .012 50/.3);display:flex;flex-direction:column;animation:gd-in var(--dur) var(--ease)}@keyframes gd-in{0%{transform:translateX(20px);opacity:0}}.gd-head{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:16px 18px;border-bottom:1px solid var(--line);background:var(--crimson-soft)}.gd-head h3{margin:0;font-family:var(--serif);font-size:var(--text-lg);color:var(--crimson)}.gd-close{flex:none;width:30px;height:30px;border-radius:8px;border:1px solid var(--line-strong);background:var(--surface);font-size:1.2rem;line-height:1;cursor:pointer;color:var(--ink-soft)}.gd-close:hover{border-color:var(--crimson);color:var(--crimson)}.gd-body{flex:1 1;overflow-y:auto;padding:18px;font-size:var(--text-sm)}.wikilink{color:var(--crimson);font-weight:600;text-decoration:none;border-bottom:1px dashed var(--crimson);cursor:pointer}.wikilink:hover{background:var(--crimson-soft)}.wikilink-flat{color:var(--ink-soft);font-weight:600}.anim-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));grid-gap:18px;gap:18px}.anim-card{margin:0;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow-card);cursor:pointer;transition:transform var(--dur) var(--ease),box-shadow var(--dur) var(--ease)}.anim-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lift)}.anim-card figcaption{padding:10px 14px;font-weight:700;font-size:var(--text-sm);border-bottom:1px solid var(--line);display:flex;gap:8px;align-items:center}.anim-frame{position:relative}.anim-frame iframe{width:100%;height:240px;border:0;display:block;background:#fbfbf9;pointer-events:none}.anim-expand{position:absolute;right:8px;bottom:8px;font-size:var(--text-xs);background:oklch(100% 0 0/.82);padding:3px 9px;border-radius:999px;color:var(--ink-soft)}.anim-modal{position:fixed;inset:0;z-index:100;background:oklch(20% .01 50/.55);-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);display:grid;place-items:center;padding:24px}.anim-modal-inner{width:min(980px,94vw);height:min(700px,88vh);background:var(--surface);border-radius:var(--radius);overflow:hidden;display:flex;flex-direction:column;box-shadow:var(--shadow-lift)}.anim-modal-head{display:flex;justify-content:space-between;align-items:center;gap:10px;padding:12px 16px;border-bottom:1px solid var(--line);background:var(--crimson-soft);font-weight:700}.anim-modal-inner iframe{flex:1 1;width:100%;border:0;background:#fbfbf9}.anim-loading{flex:1 1;display:grid;place-items:center;color:var(--ink-faint);background:#fbfbf9;font-size:var(--text-sm)}.anim-controls{display:flex;align-items:center;gap:8px;padding:10px 14px;border-top:1px solid var(--line);background:var(--surface-2)}.anim-controls button{height:34px;min-width:40px;padding:0 12px;border:1px solid var(--line-strong);border-radius:9px;background:var(--surface);color:var(--ink);font-size:.95rem;cursor:pointer;transition:background var(--dur) var(--ease),border-color var(--dur) var(--ease)}.anim-controls button:hover{border-color:var(--crimson);background:var(--crimson-soft)}.anim-controls .anim-play{font-weight:700;min-width:88px}.anim-controls .anim-rate{font-weight:700;font-feature-settings:"tnum";font-variant-numeric:tabular-nums}.anim-controls .anim-manual{font-weight:700;border-color:var(--crimson);color:var(--crimson)}.anim-controls .anim-manual:hover{background:var(--crimson);color:#fff}.anim-controls .anim-hint{margin-left:auto;font-size:var(--text-xs);color:var(--ink-faint)}@media (max-width:560px){.anim-controls .anim-hint{display:none}}.proj-head h1{font-family:var(--serif);font-size:var(--text-2xl);margin:10px 0 4px}.proj-layout{display:grid;grid-template-columns:340px minmax(0,1fr);grid-gap:20px;gap:20px;margin-top:18px;align-items:start}@media (max-width:860px){.proj-layout{grid-template-columns:1fr}}.proj-composer{display:flex;flex-direction:column;gap:12px;position:-webkit-sticky;position:sticky;top:16px}@media (max-width:860px){.proj-composer{position:static}}.proj-parsing{margin:0}.proj-drop{display:flex;flex-direction:column;align-items:center;gap:5px;padding:20px 16px;border:2px dashed var(--line-strong);border-radius:var(--radius);background:var(--surface-2);cursor:pointer;text-align:center;transition:border-color var(--dur) var(--ease),background var(--dur) var(--ease)}.proj-drop.over,.proj-drop:hover{border-color:var(--crimson);background:var(--crimson-soft)}.proj-drop:focus-visible{outline:2px solid var(--crimson);outline-offset:2px}.proj-drop-icon{font-size:1.5rem}.proj-files{list-style:none;display:flex;flex-direction:column;gap:6px;margin:0;padding:0}.proj-files li{display:grid;grid-template-columns:1fr auto auto;align-items:center;grid-gap:10px;gap:10px;padding:8px 12px;background:var(--surface-2);border:1px solid var(--line);border-radius:var(--radius-sm);font-size:var(--text-sm)}.proj-files li.err{border-color:var(--bad);color:var(--bad)}.proj-file-name{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-weight:600}.proj-file-x{border:none;background:none;color:var(--ink-faint);cursor:pointer;font-size:1.15rem;line-height:1}.proj-file-x:hover{color:var(--crimson)}.proj-notes{width:100%;resize:vertical;min-height:96px;padding:12px 14px;border:1.5px solid var(--line-strong);border-radius:var(--radius-sm);font:inherit;background:var(--bg)}.proj-notes:focus{outline:none;border-color:var(--crimson)}.proj-composer-foot{display:flex;align-items:center;justify-content:space-between;gap:10px}.proj-composer-foot .btn{white-space:nowrap}.proj-count.warn{color:var(--bad)}.proj-result{min-height:360px}.proj-empty{display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;min-height:280px;gap:4px}.proj-empty-mark{width:56px;height:56px;display:grid;place-items:center;border-radius:16px;background:linear-gradient(135deg,var(--crimson),var(--gold));color:#fff;font-weight:700;box-shadow:0 10px 28px -10px var(--crimson);margin-bottom:6px}.proj-empty h2{font-size:var(--text-lg);margin:0}.exam-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));grid-gap:18px;gap:18px;margin-top:10px}.exam-card{display:flex;flex-direction:column;padding:22px;text-decoration:none;color:inherit;transition:transform var(--dur) var(--ease),box-shadow var(--dur) var(--ease)}.exam-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lift)}.exam-ico{font-size:1.8rem}.exam-card h3{font-family:var(--serif);font-size:var(--text-lg);margin:10px 0 6px}.exam-card p{flex:1 1;font-size:var(--text-sm);margin:0 0 16px}.exam-wrap{max-width:820px}.exam-paper .md{font-size:var(--text-base);line-height:1.75}.exam-answers{margin-top:30px;border-top:2px dashed var(--line-strong);padding-top:22px}