:root{--bg:#fff;--fg:#16181d;--muted:#656b76;--line:#e3e6eb;--card:#fff;--accent:#1c58f2;--accent-fg:#fff;--chip:#f2f4f8;--radius:14px;--max:960px}@media (prefers-color-scheme:dark){:root{--bg:#0e1014;--fg:#eceef2;--muted:#9aa1ae;--line:#262a33;--card:#171a20;--accent:#6f95ff;--accent-fg:#0e1014;--chip:#1e222a}}*{box-sizing:border-box}body,html{margin:0;padding:0}body{background:var(--bg);color:var(--fg);font-family:system-ui,-apple-system,Hiragino Kaku Gothic ProN,Noto Sans JP,Meiryo,sans-serif;line-height:1.7;-webkit-font-smoothing:antialiased}a{color:inherit}.wrap{max-width:var(--max);margin:0 auto;padding:0 20px}.site-header{border-bottom:1px solid var(--line);position:-webkit-sticky;position:sticky;top:0;background:color-mix(in srgb,var(--bg) 88%,transparent);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);z-index:10}.site-header .wrap{display:flex;align-items:center;gap:16px;height:58px}.brand{font-weight:700;text-decoration:none;letter-spacing:-.01em}.site-header nav{margin-left:auto;display:flex;gap:16px;font-size:14px}.site-header nav a{color:var(--muted);text-decoration:none}.site-header nav a:hover{color:var(--fg)}.site-footer{border-top:1px solid var(--line);margin-top:64px;padding:28px 0 48px;color:var(--muted);font-size:13px}.site-footer nav{display:flex;flex-wrap:wrap;gap:16px;margin-bottom:10px}.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));grid-gap:14px;gap:14px;padding:0;margin:24px 0 0;list-style:none}.card{display:flex;gap:12px;padding:14px;border:1px solid var(--line);border-radius:var(--radius);background:var(--card);text-decoration:none;align-items:flex-start}.card:hover{border-color:var(--accent)}.card .icon{width:44px;height:44px;border-radius:10px;background:var(--chip);flex:0 0 auto;object-fit:cover;display:grid;place-items:center;font-size:12px;color:var(--muted)}.card h3{margin:0 0 2px;font-size:15px;line-height:1.4}.card p{margin:0;font-size:13px}.card p,.day{color:var(--muted)}.day{font-feature-settings:"tnum";font-variant-numeric:tabular-nums;font-size:12px}.chips{display:flex;flex-wrap:wrap;gap:6px;margin:10px 0 0;padding:0;list-style:none}.chip{font-size:12px;padding:2px 9px;border-radius:999px;background:var(--chip);color:var(--muted)}.chips.tags{margin-top:8px}a.chip.tag{display:inline-block;text-decoration:none;border:1px solid var(--line);color:var(--fg)}a.chip.tag:focus-visible,a.chip.tag:hover{border-color:var(--accent);color:var(--accent)}.problem{margin:20px 0 0;padding:14px 16px;border:1px solid var(--line);border-radius:var(--radius);background:var(--card)}.problem h2{margin:0 0 4px;font-size:12px;font-weight:600;letter-spacing:.04em;color:var(--muted)}.problem p{margin:0;font-size:17px;line-height:1.5}.search{display:flex;gap:8px;margin-top:20px}.search input{flex:1 1;padding:10px 14px;font:inherit;font-size:15px;border:1px solid var(--line);border-radius:999px;background:var(--card);color:var(--fg)}.btn,.search button{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:10px 18px;font:inherit;font-size:15px;font-weight:600;border:1px solid transparent;border-radius:999px;background:var(--accent);color:var(--accent-fg);text-decoration:none;cursor:pointer}.btn.secondary{background:transparent;color:var(--fg);border-color:var(--line)}.actions{display:flex;flex-wrap:wrap;gap:10px;margin:20px 0}.detail-head{display:flex;gap:16px;align-items:flex-start;margin-top:28px}.detail-head .icon{width:72px;height:72px;border-radius:16px;background:var(--chip);flex:0 0 auto;object-fit:cover}.detail-head h1{margin:4px 0 6px;font-size:24px;line-height:1.3}dl.meta{display:grid;grid-template-columns:max-content 1fr;grid-gap:6px 18px;gap:6px 18px;margin:24px 0;font-size:14px;border-top:1px solid var(--line);padding-top:16px}dl.meta dt{color:var(--muted)}dl.meta dd{margin:0;overflow-wrap:anywhere}.player{margin:20px 0;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:var(--card)}.player-bar{display:flex;align-items:center;gap:12px;padding:8px 12px;border-bottom:1px solid var(--line);font-size:14px}.player-bar .title{font-weight:600;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.player-bar .spacer{margin-left:auto}.player iframe{display:block;width:100%;height:min(78vh,780px);border:0;background:var(--bg)}.notice{border:1px solid var(--line);border-left:4px solid var(--accent);border-radius:8px;padding:12px 16px;margin:20px 0;font-size:14px;background:var(--card)}.prose{max-width:720px}.prose h1{font-size:26px;margin-top:32px}.prose h2{font-size:19px;margin-top:36px;padding-bottom:6px;border-bottom:1px solid var(--line)}.prose h3{font-size:16px;margin-top:26px}.prose table{border-collapse:collapse;width:100%;font-size:14px;display:block;overflow-x:auto}.prose td,.prose th{border:1px solid var(--line);padding:7px 10px;text-align:left;vertical-align:top}.prose th{white-space:nowrap}.prose code,.prose th{background:var(--chip)}.prose code{padding:1px 5px;border-radius:4px;font-size:.9em}.empty{color:var(--muted);padding:40px 0;text-align:center}