:root{--bg:#fafaf7;--surface:#fff;--surface-2:#f4f4f0;--surface-3:#edede7;--text:#18181b;--text-muted:#71717a;--text-faint:#a1a1aa;--border:#e7e5e0;--border-strong:#d4d4d0;--accent:#2563eb;--accent-soft:#eff6ff;--accent-ring:#2563eb2e;--easy:#16a34a;--easy-soft:#dcfce7;--med:#d97706;--med-soft:#fef3c7;--hard:#dc2626;--hard-soft:#fee2e2;--shadow-sm:0 1px 2px #140e210a;--shadow-md:0 4px 14px -3px #140e2114, 0 1px 3px #140e210a;--shadow-lg:0 18px 40px -12px #140e212e, 0 2px 6px #140e210f;--r-sm:6px;--r-md:10px;--r-lg:14px;--r-xl:20px;--font-sans:"Geist", -apple-system, ui-sans-serif, system-ui, sans-serif;--font-mono:"Geist Mono", ui-monospace, monospace;--font-display:"Instrument Serif", "Times New Roman", serif;--dur-fast:.12s;--dur:.18s;--ease:cubic-bezier(.32,.72,.16,1)}[data-theme=dark]{--bg:#0b0b0e;--surface:#131318;--surface-2:#1a1a20;--surface-3:#232329;--text:#fafaf7;--text-muted:#a1a1aa;--text-faint:#6f6f78;--border:#25252b;--border-strong:#34343c;--accent-soft:#2563eb29;--accent-ring:#2563eb52;--easy-soft:#16a34a29;--med-soft:#d977062e;--hard-soft:#dc262629;--shadow-sm:0 1px 2px #00000059;--shadow-md:0 4px 14px -3px #00000080, 0 1px 3px #0000004d;--shadow-lg:0 18px 40px -12px #0009, 0 2px 6px #0006}*,:before,:after{box-sizing:border-box}html,body{height:100vh;margin:0;padding:0;overflow:hidden}body{font-family:var(--font-sans);background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased;letter-spacing:-.005em;font-size:14px;line-height:1.45}button{cursor:pointer;font-family:inherit}input,select,textarea{font-family:inherit}::selection{background:var(--accent-ring);color:var(--text)}.app{grid-template-columns:232px 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var(--border);flex-direction:column;gap:10px;margin-top:auto;padding:12px;display:flex}.user-row{align-items:center;gap:10px;display:flex}.avatar{color:#fff;background:linear-gradient(135deg,#ffb87a,#e2538c);border-radius:50%;flex-shrink:0;place-items:center;width:30px;height:30px;font-size:11px;font-weight:600;display:grid;box-shadow:inset 0 1px #ffffff4d}.user-name{font-size:13px;font-weight:600;line-height:1.2}.user-rank{color:var(--text-muted);align-items:center;gap:4px;margin-top:2px;font-size:11px;display:flex}.level-pill{background:var(--accent);color:#fff;letter-spacing:.02em;border-radius:4px;padding:2px 6px;font-size:10px;font-weight:700}.xp-bar{background:var(--surface-3);border-radius:3px;height:6px;overflow:hidden}.xp-bar-fill{background:linear-gradient(90deg, var(--accent), #60a5fa);height:100%;transition:width .6s var(--ease);border-radius:3px}.xp-text{color:var(--text-muted);font-variant-numeric:tabular-nums;font-size:10.5px;font-family:var(--font-mono);justify-content:space-between;display:flex}.main{flex-direction:column;min-width:0;display:flex;overflow:hidden}.topbar{border-bottom:1px solid var(--border);background:var(--bg);flex-shrink:0;align-items:center;gap:10px;height:54px;padding:0 24px;display:flex}.breadcrumb{color:var(--text-muted);font-size:13px}.breadcrumb-current{color:var(--text);font-weight:600}.streak-chip{color:#c2410c;background:linear-gradient(#ffa55024,#ff50501a);border:1px solid #ff8c5047;border-radius:999px;align-items:center;gap:5px;padding:5px 10px;font-size:12.5px;font-weight:600;display:flex}[data-theme=dark] .streak-chip{color:#fdba74}.streak-chip .flame{width:14px;height:14px}.icon-btn{border-radius:var(--r-md);border:1px solid var(--border);background:var(--surface);width:32px;height:32px;color:var(--text-muted);transition:background var(--dur-fast), color 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