:root{--bg: #edf0f8;--surface: #ffffff;--surface-2: #f4f6fc;--surface-3: #e9ecf5;--border: #e2e6f0;--text: #171a2b;--text-soft: #4b5165;--muted: #8890a4;--primary: #3538cd;--primary-hover: #2c2fb2;--primary-soft: rgba(53, 56, 205, .08);--violet: #7c3aed;--violet-soft: rgba(124, 58, 237, .1);--cyan: #0891b2;--cyan-soft: rgba(8, 145, 178, .1);--green: #10b981;--green-soft: rgba(16, 185, 129, .12);--red: #dc2626;--amber: #b45309;--amber-soft: rgba(217, 119, 6, .1);--amber-border: rgba(217, 119, 6, .35);--shadow: 0 1px 2px rgba(23, 26, 43, .05)}*{box-sizing:border-box}body{margin:0;font-family:Inter,Segoe UI,system-ui,-apple-system,sans-serif;background:var(--bg);color:var(--text);font-size:15px;line-height:1.5;-webkit-font-smoothing:antialiased}button{font-family:inherit}.topbar{background:var(--surface);border-bottom:1px solid var(--border);padding:14px 0;position:sticky;top:0;z-index:20}.container{max-width:1320px;margin:0 auto;padding:0 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var(--border);display:flex;flex-direction:column;gap:5px}.back-extra p{margin:0;font-size:14.5px;line-height:1.55;color:var(--muted)}.pc-extra{margin:6px 0 0;padding-top:6px;border-top:1px dashed var(--border);font-size:12.5px;line-height:1.5;color:var(--muted);white-space:pre-line}