:root{--bg: #0d1117;--panel: #161b22;--panel-2: #1c2330;--border: #2d3648;--text: #e6edf3;--muted: #8b98a9;--accent: #58a6ff;--good: #3fb950;--bad: #f85149;--warn: #d29922;--flag: #b58900;--mono: "SF Mono", "Cascadia Code", Consolas, Menlo, monospace;--sans: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:var(--sans);line-height:1.5}.shell{max-width:880px;margin:0 auto;padding:24px 16px 48px}.masthead h1{margin:8px 0 4px;font-size:2rem;letter-spacing:-.02em}.tagline{color:var(--muted);margin:0 0 24px;max-width:60ch}.modes{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-bottom:24px}@media(max-width:700px){.modes{grid-template-columns:1fr}}.mode-card{background:var(--panel);border:1px solid var(--border);border-radius:12px;padding:18px 20px}.mode-card h2{margin:0 0 8px;font-size:1.15rem}.mode-card p{color:var(--muted);margin:0 0 12px;font-size:.925rem}.mode-card.daily{border-color:#3b4b6b;background:linear-gradient(160deg,#16213a 0%,var(--panel) 70%)}.streak{color:var(--warn);font-weight:600}button{font:inherit;cursor:pointer;border-radius:8px;border:1px solid var(--border);padding:8px 16px;background:var(--panel-2);color:var(--text)}button:hover{border-color:var(--accent)}button.primary{background:#1f6feb;border-color:#1f6feb;font-weight:600}button.primary:hover{background:#388bfd}button.primary.done{background:var(--panel-2);border-color:var(--border);font-weight:400;color:var(--muted)}button.ghost{background:transparent;color:var(--muted)}.tier-row{display:flex;gap:8px;flex-wrap:wrap}.tier-novice:hover{border-color:var(--good)}.tier-intermediate:hover{border-color:var(--warn)}.tier-expert:hover{border-color:var(--bad)}.fine{color:var(--muted);font-size:.85rem;margin-top:12px}.profile{background:var(--panel);border:1px solid var(--border);border-radius:12px;padding:18px 20px}.profile h2{margin:0 0 12px;font-size:1.15rem}.profile-grid{display:grid;grid-template-columns:1fr 260px;gap:16px;align-items:center}@media(max-width:700px){.profile-grid{grid-template-columns:1fr}}.stats{display:grid;grid-template-columns:1fr 1fr;gap:12px}.stat{background:var(--panel-2);border-radius:10px;padding:12px;text-align:center}.stat-value{font-size:1.5rem;font-weight:700}.stat-label{color:var(--muted);font-size:.8rem}.radar svg{width:100%;height:auto}.radar-ring{fill:none;stroke:var(--border);stroke-width:1}.radar-data{fill:#58a6ff40;stroke:var(--accent);stroke-width:2}.radar-label{fill:var(--muted);font-size:11px;font-family:var(--sans)}.round-bar{display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap;margin-bottom:8px}.round-meta{display:flex;gap:8px;flex-wrap:wrap}.chip{display:inline-block;background:var(--panel-2);border:1px solid var(--border);color:var(--muted);border-radius:999px;padding:2px 10px;font-size:.8rem}.chip.lang{color:var(--accent)}.tier-chip.tier-novice{color:var(--good)}.tier-chip.tier-intermediate{color:var(--warn)}.tier-chip.tier-expert{color:var(--bad)}.timer{position:relative;flex:1;min-width:160px;max-width:320px;height:22px;background:var(--panel-2);border:1px solid var(--border);border-radius:999px;overflow:hidden}.timer-fill{height:100%;background:var(--accent);transition:width 1s linear}.timer-fill.low{background:var(--bad)}.timer-text{position:absolute;inset:0;display:grid;place-items:center;font-size:.8rem;font-weight:600;color:var(--text);text-shadow:0 1px 2px rgba(0,0,0,.6)}.round-title{margin:8px 0 4px;font-size:1.3rem}.round-brief{color:var(--muted);margin:0 0 12px}.code-panel{background:var(--panel);border:1px solid var(--border);border-radius:12px;overflow-x:auto;margin-bottom:16px}.code{margin:0;padding:12px 0;font-family:var(--mono);font-size:.875rem;line-height:1.55;min-width:max-content}.code-line{display:flex;padding:0 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20px;margin-bottom:16px}.grade{font-size:3rem;font-weight:800;width:72px;height:72px;display:grid;place-items:center;border-radius:12px;background:var(--panel-2)}.grade-S .grade{color:gold;box-shadow:0 0 24px #ffd70040}.grade-A .grade{color:var(--good)}.grade-B .grade{color:var(--accent)}.grade-C .grade{color:var(--warn)}.grade-D .grade{color:var(--bad)}.result-details h2{margin:0}.result-details p{margin:4px 0 0;color:var(--muted)}.explainer{margin-bottom:16px}.explainer h2{font-size:1.15rem}.defect{background:var(--panel);border:1px solid var(--border);border-radius:12px;padding:14px 18px;margin-bottom:12px}.defect.found{border-left:4px solid var(--good)}.defect.missed{border-left:4px solid var(--bad)}.defect-head{display:flex;gap:8px;align-items:center;flex-wrap:wrap;margin-bottom:6px}.defect-status{font-weight:700;font-size:.85rem}.defect.found .defect-status{color:var(--good)}.defect.missed .defect-status{color:var(--bad)}.defect h3{margin:4px 0;font-size:1rem}.defect p{margin:4px 0;color:var(--muted);font-size:.925rem}.defect .fix{color:var(--text)}.cat-logic{color:#a5b4fc}.cat-null-safety{color:#7dd3fc}.cat-security{color:#fda4af}.cat-performance{color:#fcd34d}.cat-style{color:#a7f3d0}.footer{margin-top:32px;color:var(--muted);font-size:.85rem}.footer a{color:var(--accent)}