:root {
  --primary: #0066cc;
  --primary-dark: #004d99;
  --primary-light: #e6f2ff;
  --accent: #f59e0b;
  --text: #1f2937;
  --text-light: #6b7280;
  --bg: #ffffff;
  --bg-alt: #f8fafc;
  --border: #e5e7eb;
  --shadow: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
  --radius: 8px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; height: auto; }

.container { width: 92%; max-width: 1200px; margin: 0 auto; }

/* Header */
.header {
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}
/* 横幅 + header 同时吸顶：横幅在上，header 的 sticky top 需等于横幅高度 */
.contact-bar {
  position: sticky;
  top: 0;
  z-index: 101;
}
.header.has-contact-bar { top: 35px; }
@media (max-width: 768px) { .header.has-contact-bar { top: 41px; } }
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 0;
}
.logo { display: flex; align-items: center; gap: 0.75rem; }
.logo img { height: 48px; width: auto; }
.logo-text { font-size: 1.25rem; font-weight: 700; color: var(--primary); }

.nav { display: flex; align-items: center; gap: 1.5rem; }
.nav a { color: var(--text); font-weight: 500; font-size: 0.95rem; }
.nav a:hover { color: var(--primary); text-decoration: none; }
.nav .btn { margin-left: 0.5rem; }

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text);
}

@media (max-width: 900px) {
  .nav { display: none; position: absolute; top: 100%; left: 0; right: 0; background: var(--bg); flex-direction: column; padding: 1rem; border-bottom: 1px solid var(--border); gap: 1rem; }
  .nav.open { display: flex; }
  .mobile-menu-btn { display: block; }
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.6rem 1.25rem;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  border: none;
  transition: all 0.2s;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); text-decoration: none; }
.btn-accent { background: var(--accent); color: #1f2937; }
.btn-accent:hover { filter: brightness(0.95); text-decoration: none; }
.btn-outline { background: transparent; border: 2px solid var(--primary); color: var(--primary); }
.btn-outline:hover { background: var(--primary-light); text-decoration: none; }
.btn-sm { padding: 0.4rem 0.9rem; font-size: 0.85rem; }
.btn-lg { padding: 0.85rem 1.75rem; font-size: 1.05rem; }

/* Hero */
.hero { background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%); color: #fff; padding: 5rem 0 4.5rem; }
.hero-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 3rem; align-items: center; }
.hero h1 { font-size: 2.75rem; line-height: 1.15; margin: 0 0 1rem; }
.hero p.lead { font-size: 1.15rem; opacity: 0.92; margin-bottom: 2rem; }
.hero-btns { display: flex; gap: 1rem; flex-wrap: wrap; }
.hero-image { border-radius: var(--radius); overflow: hidden; box-shadow: 0 20px 40px rgba(0,0,0,0.2); }
.hero-image img { width: 100%; display: block; }
@media (max-width: 768px) { .hero-inner { grid-template-columns: 1fr; } .hero h1 { font-size: 2rem; } }

/* Sections */
.section { padding: 4rem 0; }
.section-title { text-align: center; margin-bottom: 2.5rem; }
.section-title h2 { font-size: 2rem; margin: 0 0 0.5rem; color: var(--text); }
.section-title p { color: var(--text-light); margin: 0; }

.bg-alt { background: var(--bg-alt); }

/* Features */
.features-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 1.5rem; }
.feature-card { background: var(--bg); padding: 1.75rem; border-radius: var(--radius); box-shadow: var(--shadow); border-top: 4px solid var(--primary); }
.feature-card h3 { margin: 0 0 0.5rem; font-size: 1.15rem; }
.feature-card p { margin: 0; color: var(--text-light); font-size: 0.95rem; }

/* Trust bar */
.trust-bar { background: var(--bg); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); padding: 1.5rem 0; }
.trust-items { display: flex; justify-content: center; gap: 2.5rem; flex-wrap: wrap; }
.trust-item { display: flex; align-items: center; gap: 0.5rem; color: var(--text-light); font-size: 0.9rem; font-weight: 500; }

/* Product filter */
.filter-bar { display: flex; gap: 0.5rem; flex-wrap: wrap; justify-content: center; margin-bottom: 2rem; }
.filter-btn { background: #fff; border: 1px solid var(--border); padding: 0.45rem 1rem; border-radius: 999px; cursor: pointer; font-size: 0.9rem; }
.filter-btn.active, .filter-btn:hover { background: var(--primary); color: #fff; border-color: var(--primary); }

/* Product grid */
.product-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 1.75rem; }
.product-card { background: #fff; border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); transition: transform 0.2s, box-shadow 0.2s; display: flex; flex-direction: column; }
.product-card:hover { transform: translateY(-4px); box-shadow: 0 12px 24px rgba(0,0,0,0.12); }
.product-image { position: relative; background: var(--bg-alt); aspect-ratio: 4/3; overflow: hidden; }
.product-image img { width: 100%; height: 100%; object-fit: cover; }
.product-badge { position: absolute; top: 0.75rem; left: 0.75rem; background: var(--accent); color: #1f2937; font-size: 0.75rem; font-weight: 700; padding: 0.25rem 0.6rem; border-radius: 999px; }
.product-info { padding: 1.25rem; flex: 1; display: flex; flex-direction: column; }
.product-info h3 { margin: 0 0 0.25rem; font-size: 1.05rem; }
.product-info .model { color: var(--text-light); font-size: 0.85rem; margin-bottom: 0.75rem; }
.product-info .specs-mini { color: var(--text-light); font-size: 0.85rem; margin-bottom: 1rem; flex: 1; }
.product-info .btn { width: 100%; }

/* Product detail */
.product-detail { padding: 2rem 0 4rem; }
.detail-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 2.5rem; align-items: start; }
.detail-images img { border-radius: var(--radius); box-shadow: var(--shadow); }
.detail-meta h1 { margin: 0 0 0.5rem; font-size: 1.85rem; }
.detail-meta .model { color: var(--text-light); font-size: 1rem; margin-bottom: 1.25rem; }
.detail-features { list-style: none; padding: 0; margin: 0 0 1.5rem; }
.detail-features li { padding: 0.4rem 0 0.4rem 1.5rem; position: relative; }
.detail-features li::before { content: "✓"; position: absolute; left: 0; color: var(--primary); font-weight: bold; }
.specs-table { width: 100%; border-collapse: collapse; margin-bottom: 1.5rem; }
.specs-table th, .specs-table td { text-align: left; padding: 0.65rem 0.75rem; border-bottom: 1px solid var(--border); }
.specs-table th { width: 45%; color: var(--text-light); font-weight: 500; background: var(--bg-alt); }
@media (max-width: 768px) { .detail-grid { grid-template-columns: 1fr; } }

/* Catalog detail image */
.catalog-detail { margin-top: 2rem; }
.catalog-detail h3 { margin-bottom: 1rem; }
.catalog-detail img { width: 100%; border-radius: var(--radius); box-shadow: var(--shadow); }

/* CTA section */
.cta { background: var(--primary); color: #fff; padding: 3.5rem 0; text-align: center; }
.cta h2 { margin: 0 0 1rem; font-size: 1.85rem; }
.cta p { margin: 0 0 1.5rem; opacity: 0.92; }

/* About */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 2.5rem; align-items: center; }
.about-grid img { border-radius: var(--radius); box-shadow: var(--shadow); }
.about-grid h2 { margin-top: 0; }
@media (max-width: 768px) { .about-grid { grid-template-columns: 1fr; } }

/* Certifications */
.cert-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 1.5rem; }
.cert-card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 1.5rem; }
.cert-card h3 { margin: 0 0 0.5rem; font-size: 1.05rem; }
.cert-card p { margin: 0 0 1rem; color: var(--text-light); font-size: 0.9rem; }

/* 证书图片直接展示：卡片内可看，点图放大原 PDF */
.cert-card { padding: 0; overflow: hidden; display: flex; flex-direction: column; }
.cert-card-body { padding: 1.25rem 1.25rem 1rem; }
.cert-card-body h3 { margin: 0 0 0.4rem; font-size: 1.05rem; }
.cert-card-body p { margin: 0; color: var(--text-light); font-size: 0.88rem; }
.cert-thumb {
  display: block;
  width: 100%;
  padding: 0;
  border: 0;
  border-bottom: 1px solid var(--border);
  background: #f1f5f9;
  cursor: zoom-in;
  position: relative;
  overflow: hidden;
  aspect-ratio: 1191 / 1684;
}
.cert-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top center;
  display: block;
  transition: transform .3s ease;
}
.cert-thumb:hover img { transform: scale(1.04); }
.cert-thumb::after {
  content: 'View full document';
  position: absolute;
  left: 50%;
  bottom: 12px;
  transform: translateX(-50%) translateY(6px);
  background: rgba(0, 0, 0, .72);
  color: #fff;
  font-size: .8rem;
  padding: .4rem .85rem;
  border-radius: 20px;
  opacity: 0;
  transition: opacity .25s ease, transform .25s ease;
  pointer-events: none;
  white-space: nowrap;
}
.cert-thumb:hover::after { opacity: 1; transform: translateX(-50%) translateY(0); }
.cert-actions { display: flex; gap: .6rem; padding: 0 1.25rem 1.25rem; }
.cert-actions .btn { flex: 1; text-align: center; }
.cert-badge {
  display: inline-block;
  font-size: .72rem;
  padding: .18rem .5rem;
  border-radius: 4px;
  background: #ecfdf5;
  color: #047857;
  font-weight: 600;
  margin-left: .4rem;
  vertical-align: middle;
}
.cert-holder {
  margin: .6rem 0 0 !important;
  padding-top: .55rem;
  border-top: 1px dashed var(--border);
  font-size: .78rem !important;
  color: #94a3b8 !important;
  line-height: 1.5;
}
.cert-holder strong { color: #64748b; }

/* 证书归属声明框 */
.cert-notice {
  max-width: 860px;
  margin: 0 auto 2.2rem;
  padding: 1.5rem 1.7rem;
  background: #fffbeb;
  border: 1px solid #fde68a;
  border-left: 4px solid #f59e0b;
  border-radius: 8px;
  text-align: left;
}
.cert-notice h3 {
  margin: 0 0 .7rem;
  font-size: 1.02rem;
  color: #92400e;
  display: flex;
  align-items: center;
  gap: .45rem;
}
.cert-notice p {
  margin: 0 0 .7rem;
  font-size: .9rem;
  line-height: 1.65;
  color: #78350f;
}
.cert-notice p:last-child { margin-bottom: 0; }
.cert-notice-ask {
  padding-top: .7rem;
  border-top: 1px dashed #fcd34d;
  font-weight: 500;
}
.cert-notice-ask a { color: #b45309; font-weight: 600; text-decoration: underline; }
@media (max-width: 768px) {
  .cert-notice { padding: 1.15rem 1.2rem; }
}
@media (max-width: 768px) {
  .cert-actions { flex-direction: column; }
}

/* FAQ */
.faq-item { border-bottom: 1px solid var(--border); }
.faq-q { width: 100%; text-align: left; padding: 1.25rem 0; background: none; border: none; font-size: 1.05rem; font-weight: 600; cursor: pointer; display: flex; justify-content: space-between; align-items: center; }
.faq-a { max-height: 0; overflow: hidden; transition: max-height 0.3s ease; }
.faq-a-inner { padding: 0 0 1.25rem; color: var(--text-light); }
.faq-item.active .faq-a { max-height: 300px; }

/* Contact */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 2.5rem; }
.contact-form label { display: block; margin-bottom: 0.35rem; font-weight: 500; font-size: 0.9rem; }
.contact-form input, .contact-form textarea, .contact-form select {
  width: 100%; padding: 0.65rem; border: 1px solid var(--border); border-radius: var(--radius); margin-bottom: 1rem; font-size: 0.95rem;
}
.contact-form input:focus, .contact-form textarea:focus, .contact-form select:focus { outline: none; border-color: var(--primary); }
.contact-form select {
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%2364748b' stroke-width='2.5' stroke-linecap='round'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.7rem center;
  background-size: 1rem;
  padding-right: 2.2rem;
  cursor: pointer;
}
.contact-info p { margin: 0.5rem 0; }
.contact-info strong { display: inline-block; width: 80px; }
.privacy-check { display: flex; align-items: flex-start; gap: 0.5rem; margin-bottom: 1rem; font-size: 0.85rem; color: var(--text-light); }
.privacy-check input { margin-top: 0.2rem; }
@media (max-width: 768px) { .contact-grid { grid-template-columns: 1fr; } }

/* ========================================
   Contact Bar — 顶部联系方式横幅
   ======================================== */
.contact-bar {
  background: var(--primary-dark);
  color: #fff;
  font-size: 0.9rem;
}
.contact-bar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  padding: 0.55rem 0;
}
.contact-bar-tag { font-weight: 600; letter-spacing: 0.02em; white-space: nowrap; }
.contact-bar-links { display: flex; align-items: center; gap: 0.5rem; flex-wrap: wrap; }
.contact-bar-item {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.3rem 0.7rem;
  border-radius: 999px;
  color: #fff;
  font-weight: 500;
  white-space: nowrap;
  transition: background 0.2s, transform 0.2s;
}
.contact-bar-item:hover { background: rgba(255,255,255,0.16); text-decoration: none; transform: translateY(-1px); }
.contact-bar-item svg, .contact-bar-item img { width: 16px; height: 16px; flex-shrink: 0; }
.contact-bar-item.is-whatsapp { background: #25D366; color: #fff; }
.contact-bar-item.is-whatsapp:hover { background: #1eb856; }

/* ========================================
   Contact Cards — 联系页 4 宫格
   ======================================== */
.contact-cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 1rem; margin-bottom: 2.5rem; }
.contact-card {
  display: flex;
  align-items: center;
  gap: 1rem;
  background: #fff;
  border: 1px solid var(--border);
  border-left: 4px solid var(--primary);
  border-radius: var(--radius);
  padding: 1.1rem 1.25rem;
  color: var(--text);
  transition: transform 0.2s, box-shadow 0.2s;
}
.contact-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); text-decoration: none; }
.contact-card-icon {
  width: 46px; height: 46px;
  flex-shrink: 0;
  border-radius: 50%;
  background: var(--primary-light);
  color: var(--primary);
  display: flex; align-items: center; justify-content: center;
}
.contact-card-icon svg { width: 24px; height: 24px; }
.contact-card-icon.is-whatsapp { background: #dcfce7; color: #128C7E; }
.contact-card-icon.is-wechat { background: #d1fae5; color: #07C160; }
.contact-card-text { min-width: 0; }
.contact-card-label { display: block; font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--text-light); margin-bottom: 0.15rem; }
.contact-card-value { display: block; font-weight: 600; font-size: 0.98rem; color: var(--text); word-break: break-word; }
.contact-card:hover .contact-card-value { color: var(--primary); }

/* ========================================
   Mobile Sticky Contact Bar — 手机底部悬浮
   ======================================== */
.mobile-contact-bar {
  display: none;
  position: fixed;
  left: 0; right: 0; bottom: 0;
  z-index: 200;
  background: #fff;
  border-top: 1px solid var(--border);
  box-shadow: 0 -4px 12px rgba(0,0,0,0.08);
  padding: 0.5rem;
  gap: 0.4rem;
}
.mobile-contact-bar a {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.1rem;
  padding: 0.4rem 0.2rem;
  border-radius: 6px;
  font-size: 0.68rem;
  font-weight: 600;
  color: var(--text-light);
  text-align: center;
}
.mobile-contact-bar a svg { width: 20px; height: 20px; }
.mobile-contact-bar a.is-whatsapp { background: #25D366; color: #fff; }
.mobile-contact-bar a.is-email { background: var(--primary-light); color: var(--primary-dark); }
.mobile-contact-bar a:active { transform: scale(0.96); }
@media (max-width: 768px) {
  .mobile-contact-bar { display: flex; }
  body { padding-bottom: 66px; } /* 避免被悬浮条遮住页脚 */
  .contact-bar-tag { display: none; }
  .contact-bar-links { width: 100%; justify-content: space-between; }
  .contact-bar-item span { display: none; }
  .contact-bar-item { padding: 0.35rem 0.55rem; }
}

/* 表单提交反馈 */
.form-status { display: none; margin-bottom: 1rem; padding: 0.8rem 1rem; border-radius: var(--radius); font-size: 0.9rem; }
.form-status.is-ok { display: block; background: #dcfce7; color: #15803d; border: 1px solid #86efac; }
.form-status.is-warn { display: block; background: #fef3c7; color: #92400e; border: 1px solid #fde68a; }
.form-submit-row { display: flex; gap: 0.75rem; flex-wrap: wrap; }
.form-submit-row .btn { flex: 1; min-width: 180px; }


/* Footer */
.footer { background: #0f172a; color: #cbd5e1; padding: 3rem 0 1.5rem; }
.footer-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 2rem; margin-bottom: 2rem; }
.footer h4 { color: #fff; margin: 0 0 1rem; }
.footer a { color: #94a3b8; display: block; margin: 0.35rem 0; font-size: 0.9rem; }
.footer a:hover { color: #fff; }
.footer-bottom { border-top: 1px solid #1e293b; padding-top: 1.5rem; text-align: center; font-size: 0.85rem; color: #64748b; }

/* Utilities */
.text-center { text-align: center; }
.mt-1 { margin-top: 1rem; }
.mt-2 { margin-top: 2rem; }
.mb-1 { margin-bottom: 1rem; }
.breadcrumb { color: var(--text-light); font-size: 0.9rem; margin-bottom: 1rem; }
.breadcrumb a { color: var(--text-light); }

/* ---------- 视频展示区 ---------- */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.5rem;
}
/* 视频页 4 列（桌面），比 about 页的 3 列更紧凑好看 */
.video-grid-4 { grid-template-columns: repeat(4, 1fr); gap: 1.1rem; }
@media (max-width: 1200px) { .video-grid-4 { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 900px)  { .video-grid-4 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px)  { .video-grid-4 { grid-template-columns: 1fr; } }
.video-grid-4 .video-meta h3 { font-size: .95rem; }
.video-grid-4 .video-meta p { font-size: .84rem; }
.video-grid-4 .video-meta { padding: .9rem 1rem 1.1rem; }
.video-card {
  background: var(--bg-white, #fff);
  border: 1px solid var(--border-color, #e2e8f0);
  border-radius: 12px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: box-shadow .25s ease, transform .25s ease;
}
.video-card:hover {
  box-shadow: 0 12px 28px rgba(0, 0, 0, .12);
  transform: translateY(-3px);
}
.video-card .video-meta { flex: 1; }
.video-thumb {
  position: relative;
  background: #000;
  aspect-ratio: 9 / 16;
  display: block;
  width: 100%;
}
.video-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  opacity: .72;
  transition: opacity .25s ease;
}
.video-card:hover .video-thumb img { opacity: .9; }
.video-play {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 62px;
  height: 62px;
  border-radius: 50%;
  background: rgba(255, 255, 255, .92);
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: none;
  transition: background .25s ease, transform .25s ease;
}
.video-card:hover .video-play {
  background: var(--primary, #1e6bb8);
  transform: translate(-50%, -50%) scale(1.08);
}
.video-play svg { width: 24px; height: 24px; margin-left: 4px; fill: var(--primary-dark, #124a80); }
.video-card:hover .video-play svg { fill: #fff; }
.video-meta { padding: 1rem 1.15rem 1.25rem; }
.video-meta h3 { font-size: 1.05rem; margin-bottom: .35rem; }
.video-meta p { font-size: .9rem; color: var(--text-light, #64748b); margin: 0; }
.video-inline {
  width: 100%;
  border-radius: 12px;
  display: block;
  background: #000;
  aspect-ratio: 16 / 9;
}
.video-lightbox {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, .92);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  padding: 2rem 1rem;
}
.video-lightbox.is-open { display: flex; }
.video-lightbox video {
  max-width: 1000px;
  width: 100%;
  max-height: 82vh;
  border-radius: 8px;
  background: #000;
}
.video-lightbox-close {
  position: absolute;
  top: 18px;
  right: 22px;
  width: 42px;
  height: 42px;
  border: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, .16);
  color: #fff;
  font-size: 26px;
  line-height: 1;
  cursor: pointer;
  transition: background .2s ease;
}
.video-lightbox-close:hover { background: rgba(255, 255, 255, .32); }

/* 证书查看器 */
.cert-viewer {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  max-height: 92vh;
}
.cert-viewer img {
  max-width: min(92vw, 820px);
  max-height: 74vh;
  width: auto;
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 20px 60px rgba(0, 0, 0, .5);
}
.cert-viewer-bar { display: flex; gap: .7rem; flex-wrap: wrap; justify-content: center; }
.cert-viewer-bar .btn-outline {
  color: #fff;
  border-color: rgba(255, 255, 255, .45);
}
.cert-viewer-bar .btn-outline:hover { background: rgba(255, 255, 255, .14); color: #fff; }
@media (max-width: 768px) {
  .cert-viewer img { max-height: 66vh; }
}
@media (max-width: 768px) {
  .video-grid { grid-template-columns: 1fr; gap: 1.1rem; }
  .video-play { width: 52px; height: 52px; }
}