:root{color-scheme:dark;--bg:#0b1020;--bg-soft:#111a30;--panel:rgba(20,30,52,0.72);--line:rgba(148,163,184,0.18);--text:#e8eefc;--muted:#93a4c3;--accent:#f6c453;--accent-strong:#ffb703;--danger:#ff8a8a;--radius:16px}*{box-sizing:border-box}body,html{margin:0;min-height:100%}body{background:radial-gradient(1200px 600px at 15% -10%,rgba(246,196,83,.16),transparent 60%),radial-gradient(900px 500px at 90% 0,rgba(76,201,240,.12),transparent 55%),var(--bg);color:var(--text);font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Microsoft YaHei,sans-serif;line-height:1.6}a{color:inherit;text-decoration:none}.shell{width:min(1180px,calc(100% - 40px));margin:0 auto;min-height:100vh;display:flex;flex-direction:column}.site-header{display:flex;align-items:center;justify-content:space-between;gap:24px;padding:26px 0 18px}.brand{display:inline-flex;align-items:center;gap:12px;font-weight:700;letter-spacing:.02em}.brand 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