:root{--bg: #f6f8fa;--panel: #ffffff;--border: #d0d7de;--text: #1f2328;--muted: #656d76;--accent: #0969da}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Apple SD Gothic Neo,sans-serif}.hero{text-align:center;padding:56px 20px 24px}.hero h1{margin:0 0 8px;font-size:32px}.hero p{margin:0;color:var(--muted)}main{max-width:1000px;margin:0 auto;padding:16px 20px 60px}.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:16px}.card{display:block;text-decoration:none;color:inherit;background:var(--panel);border:1px solid var(--border);border-radius:12px;overflow:hidden;transition:transform .12s ease,border-color .12s ease}.card:hover{transform:translateY(-3px);border-color:var(--accent)}.card-disabled{opacity:.55;cursor:not-allowed}.card-disabled:hover{transform:none;border-color:var(--border)}.thumb{display:block;width:100%;height:140px;object-fit:cover}.thumb-empty{display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:700;color:var(--muted);background:#eef1f4;border-bottom:1px solid var(--border)}.card-body{padding:16px 18px}.card-top{display:flex;flex-wrap:wrap;align-items:center;gap:6px;margin-bottom:12px}.badge,.cat,.stamp{font-size:11px;padding:3px 8px;border-radius:999px;font-weight:600}.badge-wasm{background:#0969da14;color:#0969da;border:1px solid #0969da40}.badge-html{background:#1a7f3714;color:#1a7f37;border:1px solid #1a7f3740}.badge-video{background:#8250df14;color:#8250df;border:1px solid #8250df40}.badge-embed{background:#bf398914;color:#bf3989;border:1px solid #bf398940}.cat-cpp{background:#0969da14;color:#0969da;border:1px solid #0969da40}.cat-py{background:#1a7f3714;color:#1a7f37;border:1px solid #1a7f3740}.cat-web{background:#8250df14;color:#8250df;border:1px solid #8250df40}.thumb-empty.cat-cpp{color:#0969da;border-bottom-color:#0969da40}.thumb-empty.cat-py{color:#1a7f37;border-bottom-color:#1a7f3740}.thumb-empty.cat-web{color:#8250df;border-bottom-color:#8250df40}.stamp{margin-left:auto;background:#fbe7a2;color:#7d4e00;border:1px solid #eac54f}.card-label{font-size:18px;font-weight:700;margin-bottom:6px;word-break:break-all}.card-desc{font-size:13px;color:var(--muted);line-height:1.5;display:-webkit-box;-webkit-line-clamp:2;line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.card-author{margin-top:12px;padding-top:10px;border-top:1px solid var(--border);font-size:12px;color:var(--muted);font-weight:600}footer{text-align:center;color:var(--muted);font-size:12px;padding:0 20px 40px}.play-body{display:flex;flex-direction:column;height:100vh;margin:0}.play-bar{display:flex;align-items:center;gap:16px;padding:10px 16px;background:var(--panel);border-bottom:1px solid var(--border)}.back{color:var(--accent);text-decoration:none;font-size:14px}.back:hover{text-decoration:underline}.play-title{font-weight:700;flex:1}.restart{background:var(--bg);color:var(--text);border:1px solid var(--border);border-radius:6px;padding:6px 14px;cursor:pointer;font-size:13px}.restart:hover{border-color:var(--accent)}#terminal{flex:1;padding:8px;background:#0d1117;overflow:hidden}.video-stage{flex:1;display:flex;align-items:center;justify-content:center;background:var(--bg);padding:24px;overflow:auto}.os-window{display:flex;flex-direction:column;max-width:100%;max-height:100%;border-radius:10px;overflow:hidden;background:#fff;box-shadow:0 22px 70px #0009,0 0 0 1px #00000040}.os-titlebar{position:relative;display:flex;align-items:center;height:30px;padding:0 12px;background:linear-gradient(#e6e6e6,#d9d9d9);border-bottom:1px solid #c2c2c2;flex:none}.os-lights{display:flex;gap:8px}.os-lights .l{width:12px;height:12px;border-radius:50%;box-shadow:inset 0 0 0 .5px #0003}.os-lights .red{background:#ff5f57}.os-lights .yellow{background:#febc2e}.os-lights .green{background:#28c840}.os-title{position:absolute;left:0;right:0;text-align:center;font-size:13px;font-weight:500;color:#4a4a4a;pointer-events:none}.os-body{position:relative;display:flex;min-height:0}.os-window video{display:block;max-width:100%;max-height:calc(100vh - 128px);background:#fff}.replay-btn{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);display:inline-flex;align-items:center;gap:10px;padding:15px 32px;font-size:17px;font-weight:600;letter-spacing:.01em;color:#fff;background:#12141a8c;border:1px solid rgba(255,255,255,.22);border-radius:999px;cursor:pointer;-webkit-backdrop-filter:blur(14px) saturate(140%);backdrop-filter:blur(14px) saturate(140%);box-shadow:0 12px 40px #00000073,inset 0 1px #ffffff2e;transition:transform .12s ease,background .18s ease,border-color .18s ease}.replay-btn .ic{font-size:20px;line-height:1}.replay-btn:hover{background:#222630b3;border-color:#ffffff59;transform:translate(-50%,-50%) scale(1.05)}.replay-btn:active{transform:translate(-50%,-50%) scale(.99)}.replay-btn[hidden]{display:none}