:root{--bg: #0b1020;--panel: #11172a;--panel-2: #161d35;--border: #1f2a48;--text: #e6e8ef;--muted: #8b95b3;--accent: #22d3ee;--accent-2: #818cf8;--danger: #f87171;--ok: #34d399;--todo: #fbbf24;--code-bg: #0a0f1f}*{box-sizing:border-box}html,body,#root{margin:0;height:100%;background:var(--bg);color:var(--text);font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,sans-serif;-webkit-font-smoothing:antialiased}a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}.layout{display:grid;grid-template-columns:260px 1fr;min-height:100vh}@media(max-width:800px){.layout{grid-template-columns:1fr}.sidebar{position:sticky;top:0;z-index:10}}.sidebar{background:var(--panel);border-right:1px solid var(--border);padding:18px 14px;display:flex;flex-direction:column;gap:8px}.sidebar h1{margin:0 0 4px;font-size:16px;letter-spacing:.4px}.sidebar .sub{color:var(--muted);font-size:12px;margin-bottom:10px}.nav-link{display:block;padding:8px 10px;border-radius:8px;color:var(--text);font-size:14px}.nav-link:hover{background:var(--panel-2);text-decoration:none}.nav-link.active{background:var(--panel-2);color:var(--accent)}.chapter-list{margin-top:8px;display:flex;flex-direction:column;gap:2px;overflow-y:auto}.chapter-list .num{color:var(--muted);margin-right:6px}.main{padding:28px 32px;max-width:1100px}h2,h3{margin-top:1.6em}h2:first-child,h3:first-child{margin-top:0}.card{background:var(--panel);border:1px solid var(--border);border-radius:10px;padding:16px;margin-bottom:14px}.card h3{margin-top:0}.btn{background:var(--accent);color:#07101e;border:none;border-radius:8px;padding:8px 14px;font-weight:600;cursor:pointer}.btn:hover{filter:brightness(1.05)}.btn.secondary{background:var(--panel-2);color:var(--text);border:1px solid var(--border)}.btn.danger{background:var(--danger);color:#1a0808}.btn:disabled{opacity:.6;cursor:not-allowed}.row{display:flex;gap:8px;flex-wrap:wrap;align-items:center}.col{display:flex;flex-direction:column;gap:8px}input[type=text],input[type=date],input[type=number],select,textarea{background:var(--code-bg);color:var(--text);border:1px solid var(--border);border-radius:8px;padding:8px 10px;font-family:inherit;font-size:14px;width:100%}textarea{min-height:120px;font-family:ui-monospace,SF Mono,Menlo,monospace}.muted{color:var(--muted);font-size:12px}.markdown{line-height:1.65}.markdown pre{background:var(--code-bg);padding:12px;border-radius:8px;overflow-x:auto;border:1px solid var(--border)}.markdown code{background:var(--code-bg);padding:2px 5px;border-radius:4px}.markdown pre code{background:transparent;padding:0}.markdown table{border-collapse:collapse}.markdown th,.markdown td{border:1px solid var(--border);padding:6px 10px}.pill{display:inline-block;padding:2px 8px;border-radius:999px;font-size:12px;font-weight:600}.pill.todo{background:#fbbf2426;color:var(--todo)}.pill.in_progress{background:#22d3ee26;color:var(--accent)}.pill.done{background:#34d39926;color:var(--ok)}.reading-row{display:flex;justify-content:space-between;align-items:center;padding:10px 0;border-bottom:1px dashed var(--border)}.reading-row:last-child{border-bottom:none}.flex-between{display:flex;justify-content:space-between;align-items:center}hr{border:none;border-top:1px solid var(--border);margin:16px 0}