*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif; color: #1a2942; background: #fff; line-height: 1.7; font-size: 15px; -webkit-font-smoothing: antialiased; }
a { color: inherit; text-decoration: none; transition: color .2s; }
img { max-width: 100%; display: block; }
ul { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
:root { --primary: #0078c8; --primary-dark: #003a6b; --primary-light: #e6f2fa; --accent: #f5a623; --text: #1a2942; --text-muted: #6b7a8f; --border: #e6eef5; --bg-soft: #f8fbfe; --max-width: 1200px; }
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }
.site-header { position: fixed; top: 0; left: 0; right: 0; background: rgba(255,255,255,0.97); backdrop-filter: saturate(180%) blur(10px); border-bottom: 1px solid var(--border); z-index: 100; transition: box-shadow .3s; }
.site-header.scrolled { box-shadow: 0 2px 16px rgba(0,58,107,0.08); }
.header-inner { max-width: var(--max-width); margin: 0 auto; padding: 14px 24px; display: flex; align-items: center; justify-content: space-between; }
.brand { display: flex; align-items: center; gap: 12px; }
.brand img { height: 44px; width: auto; }
.brand-text { display: flex; flex-direction: column; line-height: 1.1; }
.brand-text .name-cn { font-size: 18px; font-weight: 700; color: var(--primary-dark); }
.brand-text .name-en { font-size: 11px; color: var(--text-muted); letter-spacing: 1px; }
.nav { display: flex; align-items: center; gap: 4px; }
.nav a { position: relative; padding: 10px 18px; font-size: 15px; color: var(--text); font-weight: 500; border-radius: 6px; transition: all .2s; }
.nav a:hover, .nav a.active { color: var(--primary); }
.nav a.active::after { content: ''; position: absolute; bottom: -2px; left: 18px; right: 18px; height: 2px; background: var(--primary); border-radius: 2px; }
.lang-toggle { margin-left: 8px; padding: 7px 16px; border: 1px solid var(--primary); border-radius: 999px; font-size: 12px; font-weight: 600; color: var(--primary); background: transparent; transition: all .2s; cursor: pointer; letter-spacing: 1px; white-space: nowrap; }
.lang-toggle:hover { background: var(--primary); color: #fff; }
.nav-toggle { display: none; width: 36px; height: 36px; align-items: center; justify-content: center; }
.nav-toggle span { display: block; width: 22px; height: 2px; background: var(--primary-dark); position: relative; }
.nav-toggle span::before, .nav-toggle span::after { content: ''; position: absolute; left: 0; width: 100%; height: 100%; background: var(--primary-dark); }
.nav-toggle span::before { top: -7px; }
.nav-toggle span::after { top: 7px; }
.hero { position: relative; min-height: 600px; margin-top: 76px; background: linear-gradient(135deg, rgba(0,58,107,0.92) 0%, rgba(0,120,200,0.82) 100%); display: flex; align-items: center; color: #fff; overflow: hidden; }
.hero::before { content: ''; position: absolute; inset: 0; background: radial-gradient(circle at 80% 20%, rgba(255,255,255,0.1), transparent 60%); pointer-events: none; }
.hero-inner { max-width: var(--max-width); margin: 0 auto; padding: 80px 24px; position: relative; z-index: 1; }
.hero h1 { font-size: 48px; font-weight: 800; line-height: 1.2; margin-bottom: 12px; letter-spacing: 2px; }
.hero h1 .accent { color: var(--accent); }
.hero .sub-en { font-size: 18px; font-weight: 400; letter-spacing: 4px; color: rgba(255,255,255,0.85); margin-bottom: 24px; text-transform: uppercase; }
.hero p { font-size: 16px; color: rgba(255,255,255,0.92); max-width: 600px; margin-bottom: 32px; }
.btn-primary { display: inline-flex; align-items: center; gap: 8px; padding: 14px 32px; background: var(--accent); color: #fff; font-weight: 600; font-size: 15px; border-radius: 999px; transition: all .25s; box-shadow: 0 6px 16px rgba(245,166,35,0.35); }
.btn-primary:hover { background: #ff9500; transform: translateY(-2px); box-shadow: 0 8px 20px rgba(245,166,35,0.45); }
.btn-primary svg { width: 16px; height: 16px; transition: transform .2s; }
.btn-primary:hover svg { transform: translateX(4px); }
.hero-dots { position: absolute; bottom: 36px; left: 50%; transform: translateX(-50%); display: flex; gap: 10px; z-index: 2; }
.hero-dots span { width: 30px; height: 4px; background: rgba(255,255,255,0.4); border-radius: 2px; cursor: pointer; transition: all .3s; }
.hero-dots span.active { background: #fff; width: 50px; }
section { padding: 90px 0; }
.section-head { text-align: center; margin-bottom: 56px; }
.section-head h2 { font-size: 36px; font-weight: 700; color: var(--primary-dark); margin-bottom: 8px; letter-spacing: 1px; }
.section-head .en { font-size: 13px; letter-spacing: 4px; color: var(--text-muted); text-transform: uppercase; font-weight: 500; }
.section-head .divider { width: 60px; height: 3px; background: var(--accent); margin: 18px auto 0; border-radius: 2px; }
footer.site-footer { background: var(--primary-dark); color: #cfd8e3; padding: 60px 0 0; }
.foot-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 36px; }
.foot-col h5 { color: #fff; font-size: 15px; margin-bottom: 18px; font-weight: 600; }
.foot-col ul li { margin-bottom: 10px; font-size: 13px; }
.foot-col ul li a:hover { color: var(--accent); }
.foot-contact .item { display: flex; align-items: flex-start; gap: 10px; margin-bottom: 14px; font-size: 13px; line-height: 1.7; }
.foot-contact .item svg { width: 16px; height: 16px; color: var(--accent); flex-shrink: 0; margin-top: 3px; }
.foot-bottom { margin-top: 40px; padding: 20px 0; border-top: 1px solid rgba(255,255,255,0.08); text-align: center; font-size: 12px; color: rgba(255,255,255,0.5); }
.page-banner { margin-top: 76px; padding: 80px 0 60px; background: linear-gradient(135deg, var(--primary-dark), var(--primary)); color: #fff; text-align: center; }
.page-banner h1 { font-size: 36px; margin-bottom: 10px; letter-spacing: 2px; }
.page-banner p { color: rgba(255,255,255,0.8); font-size: 14px; }
.products-page { padding: 70px 0; }
.prod-detail-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 30px; }
.prod-detail-card { background: #fff; border-radius: 12px; overflow: hidden; box-shadow: 0 4px 16px rgba(0,58,107,0.06); display: flex; flex-direction: column; border-top: 4px solid var(--primary); }
.prod-detail-card.wide { grid-column: span 2; }
.prod-detail-img { height: 240px; overflow: hidden; display: flex; align-items: center; justify-content: center; background: var(--primary-light); }
.prod-detail-card.wide .prod-detail-img { height: 320px; }
.prod-detail-img img { width: 100%; height: 100%; object-fit: cover; }
.prod-detail-body { padding: 30px; flex: 1; }
.prod-detail-body .tag { display: inline-block; padding: 4px 12px; background: var(--primary-light); color: var(--primary); border-radius: 999px; font-size: 12px; font-weight: 500; margin-bottom: 14px; }
.prod-detail-body h3 { font-size: 22px; color: var(--primary-dark); margin-bottom: 6px; font-weight: 700; }
.prod-detail-body .en { font-size: 12px; color: var(--text-muted); letter-spacing: 2px; margin-bottom: 16px; text-transform: uppercase; }
.prod-detail-body p { color: var(--text); line-height: 1.8; margin-bottom: 14px; }
.prod-detail-body .features { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-top: 14px; }
.prod-detail-body .features li { padding-left: 18px; position: relative; font-size: 13px; color: var(--text); line-height: 1.7; }
.prod-detail-body .features li::before { content: ''; position: absolute; left: 0; top: 10px; width: 6px; height: 6px; border-radius: 50%; background: var(--accent); }
.prod-detail-body .prod-link { display: inline-flex; align-items: center; gap: 6px; margin-top: 18px; padding: 8px 0; color: var(--primary); font-size: 14px; font-weight: 600; border-top: 1px solid var(--border); width: 100%; transition: all .2s; }
.prod-detail-body .prod-link::after { content: '\2192'; transition: transform .2s; }
.prod-detail-body .prod-link:hover { color: var(--primary-dark); }
.prod-detail-body .prod-link:hover::after { transform: translateX(4px); }
.prod-detail-body .prod-link.open::after { transform: rotate(90deg); }
.prod-expand { display: none; grid-column: 1 / -1; background: #fff; border-radius: 12px; box-shadow: 0 4px 16px rgba(0,58,107,0.06); overflow: hidden; }
.prod-expand.open { display: block; }
.doc-content { padding: 36px 40px; max-width: 800px; margin: 0 auto; }
.doc-content h4 { font-size: 18px; color: var(--primary-dark); margin: 24px 0 12px; font-weight: 700; }
.doc-content h4:first-child { margin-top: 0; }
.doc-content p { color: var(--text); font-size: 14px; line-height: 1.9; margin-bottom: 12px; text-align: justify; }
.doc-content blockquote { border-left: 3px solid var(--primary); padding: 8px 16px; margin: 12px 0; color: var(--text-muted); font-size: 14px; font-style: italic; background: var(--bg-soft); border-radius: 0 6px 6px 0; }
.doc-content blockquote cite { display: block; margin-top: 6px; font-size: 12px; color: var(--text-muted); font-style: normal; }
.doc-content .doc-img { margin: 16px 0; text-align: center; }
.doc-content .doc-img img { max-width: 100%; border-radius: 8px; box-shadow: 0 2px 8px rgba(0,0,0,0.08); }
.doc-content .doc-img .caption { font-size: 12px; color: var(--text-muted); margin-top: 6px; }
.doc-content ul.doc-list { padding-left: 20px; margin: 8px 0 12px; }
.doc-content ul.doc-list li { list-style: disc; font-size: 14px; color: var(--text); line-height: 1.8; margin-bottom: 4px; }
.doc-content .references { margin-top: 20px; padding-top: 16px; border-top: 1px solid var(--border); }
.doc-content .references p { font-size: 12px; color: var(--text-muted); line-height: 1.6; margin-bottom: 8px; }
/* Expert testimonials */
.expert-section { margin: 0 0 28px; padding: 0; }
.expert-section-header { display: flex; align-items: center; gap: 10px; margin: 0 0 16px; padding: 0 0 10px; border-bottom: 1px dashed var(--border); }
.expert-section-header .bar { width: 4px; height: 18px; background: var(--accent); border-radius: 2px; }
.expert-section-header h4 { margin: 0; padding: 0; border: 0; font-size: 16px; color: var(--primary-dark); }
.expert-section-header .sub { font-size: 12px; color: var(--text-muted); margin-left: auto; font-weight: 400; }
.expert-quotes { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.expert-card { display: flex; gap: 14px; padding: 16px; background: linear-gradient(135deg, #f8fbff 0%, #fff 100%); border-left: 4px solid var(--primary); border-radius: 10px; box-shadow: 0 2px 12px rgba(0,58,107,0.06); }
.expert-card .info { flex: 1; min-width: 0; }
.expert-card .name { font-size: 14px; font-weight: 700; color: var(--primary-dark); margin-bottom: 2px; }
.expert-card .name .name-en { font-size: 12px; font-weight: 600; color: var(--primary); margin-left: 4px; }
.expert-card .affil { font-size: 11.5px; color: var(--text-muted); margin-bottom: 8px; line-height: 1.5; }
.expert-card .affil .role-en { color: var(--text); font-weight: 500; }
.expert-card .text { font-size: 12.5px; color: var(--text); line-height: 1.8; text-align: justify; font-style: italic; position: relative; padding: 0 4px 0 16px; }
.expert-card .text::before { content: '\201C'; position: absolute; left: 0; top: -6px; color: var(--accent); font-size: 26px; font-family: Georgia, serif; font-weight: 700; line-height: 1; }
.expert-card .text::after { content: '\201D'; color: var(--accent); font-size: 16px; font-family: Georgia, serif; font-weight: 700; margin-left: 2px; }
@media (max-width: 720px) { .expert-quotes { grid-template-columns: 1fr; } }
/* Antibody category selector */
.ab-tabs { display: flex; gap: 0; margin: 20px 0 24px; border-bottom: 2px solid var(--border); }
.ab-tab { padding: 10px 24px; font-size: 14px; font-weight: 600; color: var(--text-muted); cursor: pointer; border: none; background: none; border-bottom: 2px solid transparent; margin-bottom: -2px; transition: all .2s; }
.ab-tab:hover { color: var(--primary); }
.ab-tab.active { color: var(--primary); border-bottom-color: var(--primary); }
.ab-panel { display: none; }
.ab-panel.active { display: block; animation: fadeIn .3s ease; }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
.ab-cat-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.ab-cat-card { background: var(--bg-soft); border-radius: 10px; padding: 18px 20px; border: 1px solid var(--border); transition: all .2s; }
.ab-cat-card:hover { border-color: var(--primary); box-shadow: 0 2px 12px rgba(0,120,200,0.1); }
.ab-cat-card .cat-icon { width: 36px; height: 36px; border-radius: 8px; background: var(--primary); color: #fff; display: flex; align-items: center; justify-content: center; font-size: 16px; font-weight: 700; margin-bottom: 10px; }
.ab-cat-card h5 { font-size: 15px; color: var(--primary-dark); margin-bottom: 6px; font-weight: 700; }
.ab-cat-card .cat-count { font-size: 12px; color: var(--accent); font-weight: 600; margin-bottom: 8px; }
.ab-cat-card .cat-targets { font-size: 12px; color: var(--text-muted); line-height: 1.7; }
.ab-cat-card .cat-targets span { display: inline-block; padding: 2px 8px; background: #fff; border: 1px solid var(--border); border-radius: 4px; margin: 2px 2px 2px 0; font-size: 11px; color: var(--text); }
@media (max-width: 600px) { .ab-cat-grid { grid-template-columns: 1fr; } .ab-tab { padding: 8px 14px; font-size: 13px; } }
@media (max-width: 1024px) {
  .foot-grid { grid-template-columns: 1fr 1fr 1fr; }
  .prod-detail-grid { grid-template-columns: 1fr; }
  .prod-detail-card.wide { grid-column: span 1; }
}
@media (max-width: 720px) {
  .nav { display: none; }
  .nav.open { display: flex; flex-direction: column; position: absolute; top: 100%; left: 0; right: 0; background: #fff; padding: 16px; box-shadow: 0 4px 16px rgba(0,0,0,0.1); }
  .nav-toggle { display: flex; }
  .lang-toggle { padding: 5px 12px; font-size: 11px; }
  section { padding: 60px 0; }
  .foot-grid { grid-template-columns: 1fr; }
  .page-banner h1 { font-size: 26px; }
}
.cookie-banner { position: fixed; bottom: 0; left: 0; right: 0; background: rgba(0,58,107,0.97); color: #fff; padding: 16px 24px; z-index: 999; box-shadow: 0 -4px 20px rgba(0,0,0,0.15); transform: translateY(100%); transition: transform .3s ease; }
.cookie-banner.show { transform: translateY(0); }
.cookie-inner { max-width: var(--max-width); margin: 0 auto; display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.cookie-text { flex: 1; min-width: 260px; font-size: 13px; line-height: 1.5; }
.cookie-text strong { display: block; margin-bottom: 4px; font-size: 14px; }
.cookie-text a { color: var(--accent); text-decoration: underline; }
.cookie-actions { display: flex; gap: 10px; flex-shrink: 0; }
.cookie-btn { padding: 8px 18px; border-radius: 6px; font-size: 13px; font-weight: 600; cursor: pointer; transition: all .2s; border: 1px solid transparent; }
.cookie-accept { background: var(--accent); color: #fff; }
.cookie-accept:hover { background: #e69515; }
.cookie-reject { background: transparent; color: #fff; border-color: rgba(255,255,255,0.4); }
.cookie-reject:hover { background: rgba(255,255,255,0.1); border-color: #fff; }
.qr-thumb { display: inline-block; width: 60px; height: 60px; border-radius: 6px; cursor: pointer; transition: transform .2s; object-fit: contain; background: #fff; padding: 4px; }
.qr-thumb:hover { transform: scale(1.05); }
.qr-modal { position: fixed; inset: 0; background: rgba(0,0,0,0.85); display: none; align-items: center; justify-content: center; z-index: 1000; padding: 20px; }
.qr-modal.show { display: flex; animation: fadeIn .2s; }
.qr-modal img { max-width: 320px; width: 100%; background: #fff; padding: 16px; border-radius: 12px; }
.qr-modal-close { position: absolute; top: 20px; right: 24px; color: #fff; font-size: 32px; cursor: pointer; line-height: 1; background: none; border: 0; }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
.foot-social-row { display: flex; gap: 8px; margin-top: 8px; align-items: center; }
.foot-social-row .qr-thumb { width: 56px; height: 56px; }
.foot-col .qr-label { font-size: 12px; color: rgba(255,255,255,0.7); margin-top: 8px; line-height: 1.4; }
h4.mt28 { margin-top: 28px; }
.foot-bottom a.icp-link { color: inherit; text-decoration: none; }
.foot-bottom a.ga-link { color: inherit; text-decoration: none; display: inline-flex; align-items: center; gap: 5px; vertical-align: middle; }
.foot-bottom .ga-icon { display: inline-block; width: auto; height: 14px; max-width: none; margin: 0; vertical-align: middle; }