:root{color-scheme:light;--bg:#f6f8fb;--card:#fff;--text:#0f1b2d;--muted:#5c6b82;--line:#d9e2ef;--brand:#0f3f87}*{box-sizing:border-box}body,html{margin:0;padding:0;background:var(--bg);color:var(--text);font-family:PingFang SC,Noto Sans SC,Helvetica Neue,Arial,sans-serif}a{color:inherit;text-decoration:none}.container{width:min(960px,92vw);margin:0 auto;padding:48px 0}.card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:20px}.muted{color:var(--muted)}.stack{display:grid;grid-gap:14px;gap:14px}.btn{display:inline-flex;align-items:center;justify-content:center;height:40px;border-radius:10px;border:1px solid transparent;padding:0 16px;cursor:pointer;font-weight:600}.btn-primary{background:var(--brand);color:#fff}.btn-secondary{background:#fff;border-color:var(--line);color:var(--text)}.input{width:100%;height:40px;border:1px solid var(--line);border-radius:10px;padding:0 12px;background:#fff}