:root{--bg:#f6f7fb;--panel:#fff;--text:#151b2b;--muted:#6b7280;--line:#e5e7eb;--brand:#2563eb;--brand2:#6d5dfc;--success:#059669;--danger:#dc2626;--shadow:0 14px 45px rgba(15,23,42,.08);--radius:20px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;background:var(--bg);color:var(--text)}a{text-decoration:none;color:inherit}button,input,select,textarea{font:inherit}.container{width:min(1180px,calc(100% - 36px));margin:auto}.announcement{background:#111827;color:#fff;text-align:center;padding:9px 18px;font-size:13px}.hidden{display:none!important}.site-header{position:sticky;top:0;z-index:30;background:rgba(255,255,255,.92);backdrop-filter:blur(14px);border-bottom:1px solid rgba(229,231,235,.9)}.header-inner{height:72px;display:flex;align-items:center;gap:28px}.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:20px;white-space:nowrap}.brand-logo{width:38px;height:38px;border-radius:12px;display:grid;place-items:center;color:#fff;background:linear-gradient(135deg,var(--brand),var(--brand2));box-shadow:0 7px 18px rgba(37,99,235,.25)}.brand-logo img{width:100%;height:100%;object-fit:cover;border-radius:12px}.main-nav{display:flex;gap:22px;flex:1}.main-nav a{color:#4b5563;font-weight:600;font-size:14px}.main-nav a:hover{color:var(--brand)}.header-actions{display:flex;align-items:center;gap:10px}.header-search{display:flex;width:240px;border:1px solid var(--line);background:#fff;border-radius:12px;overflow:hidden}.header-search input{border:0;outline:0;width:100%;padding:10px 12px;background:transparent}.header-search button{border:0;background:transparent;padding:0 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