:root{--brand:#4f46e5;--brand-hover:#4338ca;--on-brand:#fff;--coin:#f59e0b;--coin-soft:#fde68a;--xp:#8b5cf6;--xp-soft:#ddd6fe;--celebration:#ec4899;--difficulty-1:#c7d2fe;--difficulty-2:#a5b4fc;--difficulty-3:#818cf8;--difficulty-4:#6366f1;--difficulty-5:#4338ca;--importance-low:#64748b;--importance-medium:#fb7185;--importance-high:#e11d48;--success:#16a34a;--warning:#d97706;--danger:#dc2626;--info:#2563eb;--bg:#fff;--surface:#f8fafc;--surface-alt:#f1f5f9;--border:#e2e8f0;--text:#0f172a;--text-muted:#64748b;--radius:12px;--shadow:0 1px 3px #0f172a14, 0 1px 2px #0f172a0a}@media (prefers-color-scheme:dark){:root:not([data-theme=light]){--bg:#0b1220;--surface:#111c31;--surface-alt:#1e293b;--border:#334155;--text:#f8fafc;--text-muted:#94a3b8;--shadow:0 1px 3px #0006}}:root[data-theme=dark]{--bg:#0b1220;--surface:#111c31;--surface-alt:#1e293b;--border:#334155;--text:#f8fafc;--text-muted:#94a3b8;--shadow:0 1px 3px #0006}*{box-sizing:border-box}body{background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased;margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif}a{color:var(--brand);text-decoration:none}h1,h2,h3{margin:0 0 .5rem}button{font:inherit;cursor:pointer;border:1px solid var(--border);background:var(--surface);color:var(--text);border-radius:8px;padding:.5rem .9rem;transition:background .15s,border-color .15s}button:hover{background:var(--surface-alt)}button.primary{background:var(--brand);color:var(--on-brand);border-color:var(--brand)}button.primary:hover{background:var(--brand-hover)}button:disabled{opacity:.5;cursor:not-allowed}input,textarea,select{font:inherit;border:1px solid var(--border);background:var(--bg);width:100%;color:var(--text);border-radius:8px;padding:.55rem .7rem}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:1rem 1.1rem}.muted{color:var(--text-muted)}.row{align-items:center;gap:.75rem;display:flex}.stack{flex-direction:column;gap:.75rem;display:flex}.grid{gap:1rem;display:grid}.pill{border-radius:999px;align-items:center;gap:.3rem;padding:.15rem .55rem;font-size:.8rem;font-weight:600;display:inline-flex}.pill.coin{background:var(--coin-soft);color:#7c4a03}.pill.xp{background:var(--xp-soft);color:#4c1d95}.shell{grid-template-columns:240px 1fr;min-height:100vh;display:grid}.sidebar{background:var(--surface);border-right:1px solid var(--border);flex-direction:column;gap:.35rem;padding:1.1rem .9rem;display:flex}.sidebar .brand{padding:.3rem .6rem .8rem;font-size:1.2rem;font-weight:800}.sidebar a{color:var(--text);border-radius:8px;padding:.55rem .7rem}.sidebar a.active,.sidebar a:hover{background:var(--surface-alt)}.main{flex-direction:column;display:flex}.topbar{border-bottom:1px solid var(--border);justify-content:space-between;align-items:center;padding:.8rem 1.4rem;display:flex}.content{width:100%;max-width:1100px;padding:1.4rem}@media (width<=720px){.shell{grid-template-columns:1fr}.sidebar{border-right:none;border-bottom:1px solid var(--border);flex-direction:row;align-items:center;overflow-x:auto}.sidebar .brand{display:none}}.center-page{place-items:center;min-height:100vh;padding:1.5rem;display:grid}