:root{--bg: #f4f6fb;--fg: #171a26;--card: #ffffff;--border: #e3e6ef;--muted: #667085;--accent: #4f6df5;--accent-fg: #ffffff}html[data-theme=dark]{--bg: #0e1016;--fg: #e7eaf3;--card: #161a25;--border: #262c3d;--muted: #8b93a9;--accent: #7c93ff;--accent-fg: #0e1016}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--fg);font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif}main{max-width:1100px;margin:0 auto;padding:16px}a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}.muted{color:var(--muted)}.empty{color:var(--muted);padding:32px;text-align:center}.top{display:flex;align-items:center;gap:16px;flex-wrap:wrap;padding:10px 16px;border-bottom:1px solid var(--border);background:var(--card);position:sticky;top:0;z-index:10}.brand{font-weight:600;font-size:16px;color:var(--fg)}nav{display:flex;gap:14px;flex:1}nav a{color:var(--muted);font-size:14px}nav a.active{color:var(--fg);font-weight:600;text-decoration:none}.controls{display:flex;gap:6px}button,select,input[type=search]{background:transparent;color:var(--fg);border:1px solid var(--border);border-radius:6px;padding:5px 10px;font-size:13px;font-family:inherit;transition:border-color .12s ease}select{appearance:none;-webkit-appearance:none;padding-right:22px;cursor:pointer;background-image:linear-gradient(45deg,transparent 50%,var(--muted) 50%),linear-gradient(135deg,var(--muted) 50%,transparent 50%);background-position:calc(100% - 14px) 55%,calc(100% - 9px) 55%;background-size:5px 5px;background-repeat:no-repeat}button{cursor:pointer}button:hover,select:hover,input[type=search]:hover{border-color:var(--muted)}button:focus-visible,select:focus,input[type=search]:focus{outline:none;border-color:var(--accent)}button:disabled{opacity:.35;cursor:default}button:disabled:hover{border-color:var(--border)}.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:12px;margin-top:14px}.card{background:var(--card);border:1px solid var(--border);border-radius:8px;padding:12px 14px;display:flex;flex-direction:column;gap:8px;transition:border-color .12s ease}.card:hover{border-color:var(--muted)}.card header{display:flex;gap:10px;justify-content:space-between;align-items:start}.card h3{margin:0;font-size:15px;font-weight:600}.desc{margin:0;color:var(--muted);font-size:13px;line-height:1.45;white-space:pre-line;display:-webkit-box;-webkit-line-clamp:4;-webkit-box-orient:vertical;overflow:hidden}.meta{display:flex;flex-wrap:wrap;gap:5px}.card footer{display:flex;justify-content:space-between;align-items:center;font-size:12px}time{color:var(--muted)}.badge{display:inline-block;padding:1px 7px;border-radius:4px;border:1px solid var(--border);color:var(--muted);font-size:11px;white-space:nowrap}.badge.diff-easy{color:#1f9d55;border-color:#1f9d5540}.badge.diff-medium{color:#b58500;border-color:#b5850040}.badge.diff-hard{color:#d33f2e;border-color:#d33f2e40}.badge.status-open{color:#1f9d55;border-color:#1f9d5540}.badge.status-in_progress{color:#b58500;border-color:#b5850040}.badge.status-closed{color:var(--muted)}.pagination{display:flex;gap:5px;justify-content:center;margin:18px 0;flex-wrap:wrap}.pagination button{min-width:30px}.pagination .active{background:var(--accent);color:var(--accent-fg);border-color:var(--accent)}.pagination .active:hover{border-color:var(--accent)}footer.foot{text-align:center;color:var(--muted);padding:20px;font-size:12px}@media(max-width:600px){nav{order:3;width:100%}main{padding:12px}}