:root{--bg:#f7f8fa;--card:#ffffff;--text:#111111;--muted:#666666;--border:#eeeeee}*{box-sizing:border-box}body,html{padding:0;margin:0;background:var(--bg);color:var(--text);font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif}a{color:inherit}.container{max-width:1100px;margin:0 auto;padding:22px 16px}.header{border-bottom:1px solid var(--border);background:#fff}.header-inner{max-width:1100px;margin:0 auto;padding:12px 16px;justify-content:space-between;gap:12px}.header-inner,.nav-desktop{display:flex;align-items:center}.nav-desktop{gap:16px}.nav-mobile{display:none}.btn{padding:10px 12px;border-radius:10px;border:1px solid #ddd;background:#fff;color:#111;font-weight:800;font-size:13px}.btn-primary{border-color:#111;background:#111;color:#fff}@media (max-width:720px){.container{padding:16px 12px}.nav-desktop{display:none}.nav-mobile{display:block}}