:root{color-scheme:dark;--bg:#0d131d;--surface:#141d2a;--panel:#192434;--line:#2a3546;--muted:#a3b0c1;--text:#edf2f8;--amber:#ffbd59;--green:#6ed9b0;--blue:#7db5ff;--red:#fc8790;--radius:16px;font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;font-size:16px}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);line-height:1.65}a{color:var(--blue);text-underline-offset:4px}button,input,select{font:inherit}button{cursor:pointer}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid var(--amber);outline-offset:4px}button{color:inherit}button:disabled{cursor:not-allowed;opacity:.5}.topbar{max-width:1440px;margin:auto;height:84px;padding:0 46px;display:flex;align-items:center;gap:28px;border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:12px;text-decoration:none;letter-spacing:2px;color:var(--text);font-size:14px}.brand 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