:root{--bg: #fbfbfc;--surface: #ffffff;--ink: #20242b;--muted: #5f6673;--faint: #8a91a0;--line: #e6e8ec;--line-strong: #cdd2da;--primary: #2a6f67;--primary-ink: #1f5650;--primary-soft: #e6f0ee;--sand: #f3efe7;--sand-deep: #e7e0d2;--warn: #c77d29;--warn-soft: #fbf1e4;--good: #3b7d4f;--good-soft: #e8f2ea;--bad: #b3453a;--bad-soft: #f8e8e5;--serif: "Newsreader", Georgia, serif;--sans: "IBM Plex Sans", system-ui, sans-serif;--mono: "IBM Plex Mono", ui-monospace, Menlo, monospace;--rail-w: 252px;--status-h: 34px;--r: 8px;--shadow: 0 1px 2px rgba(32, 36, 43, .04), 0 12px 32px -20px rgba(32, 36, 43, .18)}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{background:var(--bg);color:var(--ink);font-family:var(--sans);font-size:15px;line-height:1.55;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}a{color:var(--primary);text-decoration:none}a:hover{text-decoration:underline;text-underline-offset:3px}button,input,select,textarea{font:inherit;color:inherit}:focus-visible{outline:2px solid var(--primary);outline-offset:2px;border-radius:3px}.mono,.num{font-family:var(--mono);font-variant-numeric:tabular-nums}.dim{color:var(--muted)}.serif{font-family:var(--serif)}.eyebrow{font-family:var(--mono);font-size:11.5px;letter-spacing:.02em;color:var(--primary)}.shell{display:grid;grid-template-columns:var(--rail-w) 1fr;grid-template-rows:1fr var(--status-h);height:100vh;height:100dvh}.rail{grid-row:1 / 2;background:var(--sand);border-right:1px solid var(--sand-deep);display:flex;flex-direction:column;overflow-y:auto;padding:0 10px}.rail-brand{padding:22px 12px 18px;border-bottom:1px solid var(--sand-deep);margin-bottom:6px}.rail-brand .name{font-family:var(--serif);font-weight:500;font-size:20px;letter-spacing:-.01em;display:flex;align-items:center;gap:10px;color:var(--ink)}.rail-brand .mark{width:28px;height:28px;border-radius:8px;flex:none;background:var(--primary);color:#fff;display:inline-flex;align-items:center;justify-content:center;font-family:var(--serif);font-size:16px;font-style:italic}.rail-brand .tag{font-size:12.5px;color:var(--muted);margin-top:6px;line-height:1.4}.rail-group{padding:10px 0 4px}.rail-group-label{font-family:var(--mono);font-size:11px;letter-spacing:.04em;color:var(--faint);padding:0 12px 6px}.rail-item{display:flex;align-items:center;gap:10px;padding:8px 12px 8px 10px;margin:1px 0;border-left:3px solid 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.right{margin-left:auto;font-size:12.5px;color:var(--muted);display:flex;align-items:center;gap:8px}.topbar .right .pip{width:7px;height:7px;border-radius:50%;background:var(--good)}.content{padding:32px 32px 56px;flex:1;max-width:1240px;width:100%}.statusline{grid-column:1 / 3;border-top:1px solid var(--line);background:var(--surface);font-family:var(--mono);font-size:11.5px;color:var(--muted);display:flex;align-items:center;gap:18px;padding:0 20px;overflow:hidden;white-space:nowrap}.statusline .dot{width:7px;height:7px;border-radius:50%;background:var(--good);display:inline-block;margin-right:6px}.statusline .dot.busy{background:var(--warn);animation:pulse 1s infinite}.statusline .dot.error{background:var(--bad)}@keyframes pulse{50%{opacity:.3}}@media (prefers-reduced-motion: reduce){.statusline .dot.busy{animation:none}}.page-head{margin-bottom:26px;max-width:68ch}.page-head .eyebrow{display:block;margin-bottom:8px}.page-head 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button.on{background:var(--surface);color:var(--ink);box-shadow:var(--shadow);font-weight:500}.detail{max-width:78ch}.detail .back{margin-bottom:14px;font-size:13px}.kv{display:grid;grid-template-columns:170px 1fr;gap:8px 16px;font-size:14px;margin:16px 0}.kv dt{color:var(--muted);font-size:13px;padding-top:1px}.kv dd{margin:0}.section-h{font-family:var(--serif);font-size:17px;font-weight:500;color:var(--ink);margin:26px 0 10px;padding-bottom:8px;border-bottom:1px solid var(--line)}.prose{max-width:70ch}.prose p{margin:0 0 12px}.figure{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:20px;margin-bottom:22px;box-shadow:var(--shadow)}.figure svg{width:100%;height:auto;display:block}.figure figcaption{font-size:13px;color:var(--muted);margin-top:12px;line-height:1.5}.lesson{display:flex;gap:12px;align-items:flex-start;padding:10px 0;border-bottom:1px solid var(--line)}.lesson input{margin-top:4px;accent-color:var(--primary)}.lesson .done{text-decoration:line-through;color:var(--muted)}.progress{height:5px;background:var(--sand);border-radius:999px;margin:8px 0 16px;overflow:hidden}.progress>div{height:100%;background:var(--primary);transition:width .25s}audio{width:100%;margin-top:10px}.hero{background:var(--sand);border-radius:14px;padding:44px 48px;display:grid;grid-template-columns:minmax(0,1.4fr) minmax(280px,1fr);gap:40px;align-items:center;margin-bottom:36px}.hero h1{font-family:var(--serif);font-size:42px;font-weight:500;letter-spacing:-.02em;line-height:1.1;margin:10px 0 14px}.hero h1 em{font-style:italic;color:var(--primary-ink)}.hero .lede{font-size:17px;color:var(--muted);max-width:52ch;margin:0 0 22px;line-height:1.55}.trust{background:var(--surface);border-radius:10px;padding:22px 24px;box-shadow:var(--shadow)}.trust h2{font-family:var(--serif);font-size:18px;font-weight:500;margin:0 0 12px}.trust ul{list-style:none;margin:0;padding:0;display:grid;gap:10px}.trust 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