:root,html[data-theme=light]{--bg:#fff;--bg-elevated:#fff;--bg-highlight:#fff;--bg-hover:#fffaf5;--bg-shell:#f7f7f7;--text:#1a1a1a;--text-muted:#6b6b6b;--text-dim:#9a9a9a;--accent:#e8751a;--accent-press:#d96a12;--accent-soft:#e8751a0f;--accent-ink:#fff;--line:#0000000f;--danger:#d64545;--ok:#2f9e44;--hub-wash:#fff;--brand-from:#1a1a1a;--brand-to:#e8751a;--hero-sub:var(--text-muted);--cover-fade:#fff;--shadow-play:0 8px 20px #0000000f;--radius:12px;--radius-lg:16px;--sidebar-w:260px;--pad-x:40px;--content-max:1400px;--font-display:"Fraunces", "Georgia", serif;--font-body:"Lexend", "Segoe UI", sans-serif;color:var(--text);background:var(--bg);font-family:var(--font-body);font-synthesis:none;text-rendering:optimizelegibility;-webkit-font-smoothing:antialiased;line-height:1.45}html[data-theme=dark]{--bg:#0b0b0b;--bg-elevated:#121212;--bg-highlight:#181818;--bg-hover:#282828;--bg-shell:#000;--text:#fff;--text-muted:#b3b3b3;--text-dim:#6a6a6a;--accent:#e8751a;--accent-press:#ff9a3d;--accent-soft:#e8751a2e;--accent-ink:#000;--line:#ffffff14;--danger:#f15e6c;--ok:#1ed760;--hub-wash:#3a2412;--brand-from:#fff;--brand-to:#e8751a;--hero-sub:#ffffffbf;--cover-fade:#0b0b0b;--shadow-play:0 8px 24px #00000073}*{box-sizing:border-box}html,body,#root{background:var(--bg);width:100%;min-height:100dvh;color:var(--text);margin:0;padding:0}button{font:inherit;cursor:pointer;color:inherit;background:0 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var(--bg)}.landing-top{z-index:5;justify-content:space-between;align-items:center;gap:10px;display:flex;position:relative}.landing-top-tools{align-items:center;gap:10px;display:flex}.brand-lockup{z-index:3;color:inherit;text-align:left;background:0 0;border:0;align-items:center;gap:10px;margin:0;padding:0;display:inline-flex;position:relative}.brand-name{z-index:2;font-family:var(--font-display);letter-spacing:-.02em;background:linear-gradient(120deg, var(--brand-from) 18%, var(--brand-to) 92%);color:#0000;-webkit-background-clip:text;background-clip:text;font-weight:700;position:relative}.brand-clickable{cursor:pointer}.brand-clickable:hover .brand-name{filter:brightness(1.05)}.brand-tiger{z-index:2;object-fit:cover;border:1px solid color-mix(in srgb, var(--accent) 28%, transparent);background:#fff;border-radius:50%;flex-shrink:0;position:relative;box-shadow:0 4px 12px #0000000f}.brand-sm .brand-tiger{width:36px;height:36px}.brand-sm .brand-name{font-size:20px}.brand-md 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#e8751a14}.role-cover.teach,.role-cover.learn{background:#fff}html[data-theme=dark] .role-cover.teach,html[data-theme=dark] .role-cover.learn{background:var(--bg-highlight);color:#fff}.role-cover:hover{border-color:color-mix(in srgb, var(--accent) 35%, var(--line));transform:translateY(-3px);box-shadow:0 12px 28px #00000014}html[data-theme=dark] .role-cover:hover{box-shadow:0 20px 50px #00000073}.role-cover-glow{pointer-events:none;background:radial-gradient(circle,#e8751a1a,#0000 70%);width:60%;height:80%;position:absolute;inset:-40% auto auto 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transparent;grid-auto-columns:minmax(160px,200px);grid-auto-flow:column;gap:18px;padding-bottom:8px;display:grid;overflow-x:auto}.shelf-row::-webkit-scrollbar{height:8px}.shelf-row::-webkit-scrollbar-thumb{background:var(--text-dim);border-radius:999px}.cover-card{scroll-snap-align:start;text-align:left;border-radius:var(--radius-lg);background:var(--bg-highlight);border:1px solid var(--line);padding:14px;transition:background .18s,transform .18s,box-shadow .18s}.cover-card:hover{background:var(--bg-hover);box-shadow:var(--shadow-play);transform:translateY(-2px)}.cover-art{aspect-ratio:1;background-color:var(--cover);box-shadow:var(--shadow-play);background-position:50%;background-size:cover;border-radius:14px;place-items:center;display:grid;position:relative;overflow:hidden}.cover-art:before{content:"";pointer-events:none;background:radial-gradient(circle at 20% 20%,#ffffff59,#0000 42%),radial-gradient(circle at 80% 75%,#0000002e,#0000 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14px;display:flex}.hub-brand{font-family:var(--font-display);letter-spacing:-.03em;color:var(--text);padding:4px 12px 8px;font-size:24px;font-weight:800}.hub-side-art{border:1px solid var(--line);aspect-ratio:1.4;border-radius:14px;margin:0 8px 14px;overflow:hidden}.hub-side-art img{object-fit:cover;width:100%;height:100%;display:block}.hub-meta{color:var(--text-dim);margin:0 12px 16px;font-size:12px}.hub-side-link{color:var(--text-muted);text-align:left;border-radius:10px;align-items:center;gap:14px;width:100%;padding:12px 14px;font-weight:700;transition:color .15s,background .15s;display:flex}.hub-side-link:hover{color:var(--text)}.hub-side-link.active{color:var(--text);background:var(--accent-soft)}.hub-side-link.ghost{color:var(--text-dim);font-weight:600}.hub-ico{text-align:center;opacity:.9;width:1.25rem}.hub-main{border:1px solid var(--line);background:#fff;border-radius:12px;flex-direction:column;min-width:0;display:flex;overflow:hidden}.hub-header{padding:20px var(--pad-x) 4px;align-items:center;gap:14px;display:flex}.hub-header .back-circle{display:none}.hub-hello{font-family:var(--font-display);letter-spacing:-.02em;font-size:28px;font-weight:800}.hub-hello-sub{margin-top:2px;font-size:13px}.top-tabs,.top-bar,.bottom-bar{display:none}.grade-badge{background:var(--accent);width:44px;height:44px;color:var(--accent-ink);border-radius:50%;place-items:center;font-size:18px;font-weight:800;display:grid}.hero-banner{border:1px solid var(--line);background:#fff;border-radius:22px;grid-template-columns:200px 1fr;align-items:end;gap:28px;margin-bottom:8px;padding:24px;animation:.55s both brand-in;display:grid;position:relative;overflow:hidden;box-shadow:inset 0 0 0 1px #e8751a0f}.hero-banner.has-photo{grid-template-columns:220px 1fr;align-items:center;min-height:220px}.hero-banner-photo{aspect-ratio:1;object-fit:cover;width:100%;box-shadow:var(--shadow-play);border-radius:16px;display:block}html[data-theme=dark] .hero-banner{background:linear-gradient(120deg, var(--accent-soft), transparent 55%), linear-gradient(180deg, #ffffff0f, transparent)}.hero-banner-art{aspect-ratio:1;color:#fff;box-shadow:var(--shadow-play);background:linear-gradient(145deg,#e8751a,#9a4a0c);border-radius:12px;place-items:center;font-size:64px;font-weight:800;display:grid}.hero-banner-title{font-family:var(--font-display);letter-spacing:-.03em;margin:0;font-size:clamp(28px,4vw,44px);font-weight:800;line-height:1.05}.hero-banner-sub{color:var(--hero-sub);max-width:36rem;margin:10px 0 0;font-size:15px}.feature-strip{grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin:22px 0 8px;display:grid}.feature-chip{background:var(--bg-highlight);border:1px solid var(--line);border-radius:16px;align-items:center;gap:12px;padding:14px 16px;display:flex}.feature-emoji{font-size:24px}.feature-title{font-size:14px;font-weight:700}.feature-sub{margin-top:2px;font-size:12px}.page-hero{border:1px solid var(--line);background:#fff;border-radius:20px;grid-template-columns:140px 1fr;align-items:center;gap:20px;margin:12px 0 8px;padding:16px;display:grid;box-shadow:inset 0 0 0 1px #e8751a0d}.page-hero-img{aspect-ratio:1;object-fit:cover;width:100%;box-shadow:var(--shadow-play);border-radius:14px}.visual-grid{grid-template-columns:repeat(4,minmax(0,1fr));gap:14px;display:grid}.visual-tile{text-align:left;border:1px solid var(--line);background:var(--bg-highlight);border-radius:18px;transition:transform .15s,box-shadow .15s;overflow:hidden}.visual-tile:hover{box-shadow:var(--shadow-play);transform:translateY(-3px)}.visual-tile-art{aspect-ratio:1.15;background-color:var(--cover,var(--accent));background-position:50%;background-size:cover;place-items:center;display:grid;position:relative}.visual-tile-emoji{z-index:1;color:#fff;text-shadow:0 4px 14px #00000059;font-size:36px;position:relative}.visual-tile-title{padding:12px 14px 14px;font-size:14px;font-weight:700;display:block}.mix-card{scroll-snap-align:start;background:var(--bg-highlight);border:1px solid var(--line);border-radius:12px;align-items:center;gap:12px;min-width:280px;padding:14px;display:flex}.mix-card.highlight{background:#fffaf5;border-color:#e8751a33}html[data-theme=dark] .mix-card.highlight{background:linear-gradient(135deg,#2a2110,#181818);border-color:#e8751a59}.mix-emoji{font-size:28px}.mix-title{font-weight:700}.mix-sub{margin-top:2px;font-size:13px}.mix-time{white-space:nowrap;margin-left:auto;font-size:12px}.news-stack{flex-direction:column;gap:8px;max-width:720px;margin-top:12px;display:flex}.back-circle{background:var(--bg-elevated);border:1px solid var(--line);width:40px;height:40px;color:var(--text);border-radius:50%;flex-shrink:0;place-items:center;font-size:16px;transition:transform .15s;display:grid}.back-circle:hover{transform:scale(1.06)}.pill{color:#fff;border-radius:999px;align-items:center;gap:8px;padding:8px 14px;font-size:13px;font-weight:700;display:inline-flex}.title-row{align-items:center;gap:12px;margin-bottom:4px;display:flex}.list-card{background:var(--bg-highlight);border:1px solid var(--line);text-align:left;border-radius:12px;align-items:center;gap:14px;width:100%;padding:12px 14px;transition:background .15s;display:flex}.list-card:hover{background:var(--bg-hover)}.list-card:hover .go-fab{opacity:1;background:var(--accent);color:var(--accent-ink);transform:none}.list-card-title{font-size:15px;font-weight:700}.list-card-sub{margin-top:2px;font-size:13px}.emoji-tile{color:#fff;border-radius:12px;flex-shrink:0;place-items:center;width:52px;height:52px;font-size:22px;font-weight:800;display:grid}.detail-hero{border-radius:var(--radius-lg);background:linear-gradient(120deg, color-mix(in srgb, var(--cover,#e8751a) 28%, transparent), transparent 60%), linear-gradient(180deg, #fff6, transparent);border:1px solid var(--line);grid-template-columns:180px 1fr;align-items:end;gap:24px;margin:20px 0 8px;padding:24px;display:grid}.detail-cover{aspect-ratio:1;background:linear-gradient(145deg, color-mix(in srgb, var(--cover,#e8751a) 90%, #fff), var(--cover,#e8751a));box-shadow:var(--shadow-play);border-radius:12px;place-items:center;font-size:56px;display:grid}.lesson-body{background:var(--bg-highlight);white-space:pre-wrap;color:var(--text);border:1px solid var(--line);border-radius:14px;max-width:900px;padding:28px 32px;font-size:16px;line-height:1.7}.lesson-page{padding-bottom:64px}.page-inner.lesson-wide{max-width:min(1280px,100%)}.lesson-shell{flex-direction:column;flex:1;height:100%;min-height:0;max-height:100dvh;display:flex;overflow:hidden}.lesson-shell-top{width:100%;padding:16px var(--pad-x) 0;flex:none;margin:0 auto}.lesson-workspace{width:100%;min-height:0;padding:16px var(--pad-x) 24px;flex:1;grid-template-columns:minmax(0,.6fr) minmax(280px,.4fr);align-items:stretch;gap:24px;margin:0 auto;display:grid;overflow:hidden}.lesson-main{overscroll-behavior:contain;scrollbar-gutter:stable;flex-direction:column;gap:18px;min-width:0;min-height:0;padding-bottom:32px;padding-right:6px;display:flex;overflow:hidden auto}.lesson-aside{flex-direction:column;min-width:0;min-height:0;display:flex;overflow:hidden}.lesson-aside .lesson-video{flex:none;margin-top:0}.lesson-hero{background:radial-gradient(ellipse 80% 120% at 100% 0%, var(--lesson-soft), transparent 55%), linear-gradient(145deg, color-mix(in srgb, var(--lesson) 18%, #fff) 0%, #fff 55%);border:1px solid color-mix(in srgb, var(--lesson) 28%, transparent);border-radius:20px;margin-top:8px;padding:28px 28px 32px;position:relative;overflow:hidden}.lesson-hero-compact{margin-top:4px;margin-bottom:0;padding:16px 20px 18px}.lesson-hero-compact .lesson-hero-title{max-width:36ch;font-size:clamp(1.25rem,2.2vw,1.7rem)}.lesson-hero-compact .lesson-hero-emoji{font-size:32px}.lesson-hero-compact .lesson-hero-cap{margin-top:6px;font-size:13.5px}.lesson-hero-glow{background:radial-gradient(circle, var(--lesson-soft), transparent 70%);pointer-events:none;border-radius:50%;width:240px;height:240px;position:absolute;inset:auto -20% -40% auto}.lesson-hero-top{justify-content:space-between;align-items:center;gap:12px;margin-bottom:8px;display:flex}.lesson-badge{background:var(--lesson);color:#fff;letter-spacing:.04em;text-transform:uppercase;border-radius:999px;align-items:center;padding:6px 12px;font-size:12px;font-weight:700;display:inline-flex}.lesson-hero-emoji{filter:drop-shadow(0 6px 12px #0000001f);font-size:42px;line-height:1}.lesson-hero-title{font-family:var(--font-display);letter-spacing:-.03em;color:var(--text);max-width:28ch;margin:0;font-size:clamp(1.6rem,3vw,2.15rem);font-weight:700;line-height:1.15}.lesson-hero-cap{color:color-mix(in srgb, var(--lesson) 70%, #333);max-width:52ch;margin:10px 0 0;font-size:15px;font-weight:500}.lesson-video{border:1.5px solid color-mix(in srgb, var(--lesson) 28%, transparent);background:#fff;border-radius:18px;margin-top:0;overflow:hidden;box-shadow:0 10px 28px #0000000a}.lesson-video-head{background:linear-gradient(90deg, color-mix(in srgb, var(--lesson) 12%, #fff), #fff);flex-wrap:wrap;justify-content:space-between;align-items:flex-start;gap:12px;padding:14px 16px 12px;display:flex}.lesson-video-kicker{letter-spacing:.06em;text-transform:uppercase;color:var(--lesson);margin:0;font-size:11px;font-weight:700}.lesson-video-title{font-family:var(--font-display);letter-spacing:-.02em;color:var(--text);margin:4px 0 0;font-size:.95rem;font-weight:700;line-height:1.3}.lesson-video-open{background:var(--lesson);color:#fff;white-space:nowrap;border-radius:999px;flex:none;padding:8px 12px;font-size:12px;font-weight:700}.lesson-video-open:hover{filter:brightness(1.05)}.lesson-video-frame{aspect-ratio:16/9;background:#111;width:100%;position:relative}.lesson-video-frame iframe{border:0;width:100%;height:100%;position:absolute;inset:0}.lesson-diagram{border:1px solid color-mix(in srgb, var(--diag,var(--accent)) 22%, transparent);background:#fff;border-radius:18px;margin-top:0;overflow:hidden;box-shadow:0 10px 28px #0000000a}.lesson-diagram-svg{width:100%;height:auto;display:block}.lesson-toc{background:var(--bg-hover);border:1px solid var(--line);border-radius:16px;margin-top:0;padding:18px 20px}.lesson-toc-label{letter-spacing:.06em;text-transform:uppercase;color:var(--text-muted);margin:0 0 10px;font-size:12px;font-weight:700}.lesson-toc-list{gap:8px;margin:0;padding:0;list-style:none;display:grid}.lesson-toc-list a{border-radius:10px;align-items:flex-start;gap:10px;padding:8px 10px;font-size:14px;font-weight:600;line-height:1.35;transition:background .15s;display:flex}.lesson-toc-list a:hover{background:#fff}.lesson-toc-num{color:#fff;border-radius:7px;flex:none;place-items:center;width:22px;height:22px;margin-top:1px;font-size:11px;font-weight:700;display:grid}.lesson-sections{flex-direction:column;gap:22px;max-width:none;display:flex}.lesson-section{border:1.5px solid var(--line);border-left:5px solid var(--lesson,var(--accent));background:#fff;border-radius:18px;padding:22px 22px 24px;scroll-margin-top:16px;box-shadow:0 6px 18px #00000008}.lesson-section-head{align-items:flex-start;gap:12px;margin-bottom:14px;display:flex}.lesson-section-num{background:var(--lesson,var(--accent));color:#fff;border-radius:10px;flex:none;place-items:center;width:32px;height:32px;margin-top:2px;font-size:14px;font-weight:700;display:grid}.lesson-section-title{font-family:var(--font-display);letter-spacing:-.02em;color:var(--text);margin:0;font-size:1.15rem;font-weight:700}.lesson-section .lesson-section-title{margin:0;font-size:1.2rem;line-height:1.3}.lesson-body-rich{flex-direction:column;gap:12px;display:flex}.lesson-para{color:var(--text);margin:0;font-size:15.5px;line-height:1.75}.lesson-tip{background:var(--lesson-soft,var(--accent-soft));border:1px dashed color-mix(in srgb, var(--lesson,var(--accent)) 45%, transparent);border-radius:12px;margin:4px 0 0;padding:14px 16px}.lesson-tip-label{background:var(--lesson,var(--accent));color:#fff;letter-spacing:.04em;text-transform:uppercase;border-radius:6px;margin-bottom:6px;padding:2px 8px;font-size:11px;font-weight:700;display:inline-block}.lesson-tip p{color:var(--text);margin:0;font-size:14.5px;line-height:1.65}@media (width<=980px){.lesson-shell{height:auto;max-height:none;overflow:auto}.lesson-workspace{grid-template-columns:1fr;height:auto;min-height:0;overflow:visible}.lesson-main{max-height:none;overflow:visible}.lesson-aside{order:-1;overflow:visible}}.quiz-layout{max-width:760px}.quiz-option{text-align:left;background:var(--bg-highlight);border:1px solid var(--line);border-radius:12px;width:100%;margin-bottom:10px;padding:16px 18px;font-size:15px;font-weight:600;transition:border-color .15s,background .15s}.quiz-option:hover:not(:disabled){border-color:color-mix(in srgb, var(--accent) 45%, var(--line))}.quiz-option.selected{border-color:var(--accent);background:var(--accent-soft)}.quiz-option.correct{border-color:var(--ok);background:#2f9e441f}.quiz-option.wrong{border-color:var(--danger);background:#d645451a}.primary-btn{background:var(--accent);min-width:160px;color:var(--accent-ink);border-radius:14px;justify-content:center;align-items:center;margin-top:12px;padding:14px 22px;font-weight:700;display:inline-flex}.primary-btn:disabled{opacity:.4}.primary-btn.block{width:100%;max-width:280px}.result-burst{font-size:56px;animation:.5s both brand-in}.cards-grid,.board-grid,.teacher-grid,.note-grid{display:contents}.layout-chip{z-index:50;background:var(--bg-elevated);color:var(--text-muted);border:1px solid var(--line);pointer-events:none;border-radius:999px;padding:6px 10px;font-size:11px;font-weight:600;position:fixed;bottom:16px;right:16px}@media (width<=1023px){:root{--pad-x:24px}.hub-shell{grid-template-columns:1fr;gap:0;padding:0}.hub-sidebar{border:0;border-radius:0;display:none}.hub-mobile-switch{display:block}.hub-main{border:0;border-radius:0}.hub-header .back-circle{display:grid}.top-tabs{margin:8px var(--pad-x) 0;background:var(--bg-elevated);border:1px solid var(--line);border-radius:999px;padding:4px;display:flex}.nav-item{color:var(--text-muted);border-radius:999px;flex:1;justify-content:center;align-items:center;gap:8px;padding:10px 8px;font-size:13px;font-weight:700;display:flex}.nav-item.active{color:var(--accent-ink);background:var(--accent)}.role-grid{grid-template-columns:1fr}.landing-stage{grid-template-columns:1fr;gap:28px}.landing-visual{order:-1;min-height:0}.landing-float{display:none}.feature-strip{grid-template-columns:1fr}.visual-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.hero-banner,.hero-banner.has-photo,.detail-hero,.page-hero{grid-template-columns:120px 1fr}.shelf-row{grid-auto-columns:minmax(140px,170px)}}@media (width<=767px){:root{--pad-x:16px}.brand-hero .brand-name{font-size:48px}.hero-banner,.hero-banner.has-photo,.detail-hero,.page-hero{grid-template-columns:1fr}.hero-banner-art,.hero-banner-photo,.detail-cover,.page-hero-img{max-width:180px}.visual-grid{grid-template-columns:1fr 1fr}.nav-item{flex-direction:column;gap:2px;padding:8px 4px;font-size:11px}.h1{font-size:32px}}