/* ============================================================
   AIBEND 华云智能 · www.fbend.com
   高端浅色系企业官网样式
   ============================================================ */
:root {
  --primary: #1a56a8;
  --primary-dark: #12447f;
  --primary-light: #eaf2fc;
  --accent: #2f7de1;
  --dark: #0f2540;
  --text: #3d4a5c;
  --text-light: #6b7a8d;
  --bg-light: #f5f8fc;
  --bg-white: #ffffff;
  --border: #e3eaf3;
  --shadow: 0 10px 40px rgba(15, 37, 64, 0.08);
  --radius: 14px;
  --maxw: 1200px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  color: var(--text);
  background: var(--bg-white);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* ---------- 顶部导航 ---------- */
.navbar {
  position: sticky;
  top: 0;
  z-index: 999;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: box-shadow 0.3s;
}
.navbar.scrolled { box-shadow: 0 4px 24px rgba(15, 37, 64, 0.1); }
.nav-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
  height: 92px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-logo { display: flex; align-items: center; gap: 12px; }
.nav-logo img { height: 64px; width: auto; }
.nav-logo .logo-text { display: none; }
.nav-links { display: flex; align-items: center; gap: 6px; }
.nav-links a {
  padding: 8px 18px;
  font-size: 15.5px;
  color: var(--dark);
  border-radius: 8px;
  transition: all 0.25s;
  font-weight: 500;
}
.nav-links a:hover { color: var(--primary); background: var(--primary-light); }
.nav-links a.active { color: var(--primary); background: var(--primary-light); }
.nav-cta {
  margin-left: 14px;
  background: var(--primary);
  color: #fff !important;
  padding: 10px 24px !important;
  border-radius: 10px !important;
  box-shadow: 0 6px 18px rgba(26, 86, 168, 0.3);
}
.nav-cta:hover { background: var(--primary-dark); }
.nav-links a.nav-cta.active { background: var(--primary) !important; color: #fff !important; }
.nav-toggle { display: none; flex-direction: column; gap: 5px; cursor: pointer; background: none; border: none; padding: 8px; }
.nav-toggle span { width: 24px; height: 2.5px; background: var(--dark); border-radius: 2px; transition: 0.3s; }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, #f2f7fe 0%, #e8f0fb 45%, #dceafc 100%);
}
.hero-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 72px 24px 0;
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: 40px;
  align-items: center;
  min-height: 600px;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: #fff;
  border: 1px solid var(--border);
  color: var(--primary);
  font-size: 14px;
  padding: 7px 16px;
  border-radius: 100px;
  margin-bottom: 22px;
  box-shadow: 0 4px 14px rgba(26, 86, 168, 0.08);
}
.hero-badge::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: var(--accent); }
.hero h1 {
  font-size: 44px;
  line-height: 1.25;
  color: var(--dark);
  font-weight: 700;
  margin-bottom: 20px;
}
.hero h1 em { font-style: normal; color: var(--primary); }
.hero p.lead { font-size: 17px; color: var(--text-light); margin-bottom: 34px; max-width: 480px; }
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 12px;
  font-size: 16px;
  font-weight: 600;
  transition: all 0.3s;
  cursor: pointer;
  border: none;
}
.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  box-shadow: 0 10px 26px rgba(26, 86, 168, 0.35);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 14px 32px rgba(26, 86, 168, 0.45); }
.btn-ghost { border: 1.5px solid var(--primary); color: var(--primary); background: rgba(255,255,255,0.7); }
.btn-ghost:hover { background: var(--primary); color: #fff; }
.hero-media { position: relative; align-self: end; }
.hero-media img { width: 100%; border-radius: 18px 18px 0 0; filter: drop-shadow(0 24px 48px rgba(15, 37, 64, 0.18)); }
.hero-media::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 40%;
  background: linear-gradient(to top, rgba(255,255,255,0.9), transparent);
  pointer-events: none;
  border-radius: 0 0 0 0;
}

/* ---------- 通用 Section ---------- */
section.section { padding: 88px 0; }
section.section.alt { background: var(--bg-light); }
.sec-head { text-align: center; max-width: 760px; margin: 0 auto 56px; }
.sec-head .kicker {
  display: inline-block;
  color: var(--primary);
  font-weight: 700;
  letter-spacing: 3px;
  font-size: 14px;
  margin-bottom: 12px;
  text-transform: uppercase;
}
.sec-head h2 { font-size: 36px; color: var(--dark); line-height: 1.3; margin-bottom: 14px; }
.sec-head p { color: var(--text-light); font-size: 16.5px; }

/* ---------- 数据统计 ---------- */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.stat-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 34px 24px;
  text-align: center;
  transition: all 0.3s;
}
.stat-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); border-color: transparent; }
.stat-num {
  font-size: 44px;
  font-weight: 800;
  color: var(--primary);
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
}
.stat-num .unit { font-size: 18px; font-weight: 700; margin-left: 2px; }
.stat-label { margin-top: 10px; color: var(--text); font-size: 15.5px; font-weight: 500; }

/* ---------- 产品卡片 ---------- */
.products-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}
.product-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: all 0.35s;
  display: flex;
  flex-direction: column;
}
.product-card:hover { transform: translateY(-8px); box-shadow: var(--shadow); border-color: transparent; }
.product-media { position: relative; overflow: hidden; background: #ffffff; padding-top: 62%; }
.product-media img {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  object-fit: contain;
  padding: 14px;
  transition: transform 0.6s ease;
}
.product-media.cover-photo { background: #f5f7fa; padding-top: 0; aspect-ratio: 16 / 9; display: flex; align-items: center; justify-content: center; overflow: hidden; }
.product-media.cover-photo img { position: relative; max-width: 100%; max-height: 100%; width: auto; height: auto; object-fit: contain; padding: 6px; display: block; }
.product-card:hover .product-media img { transform: scale(1.06); }
.product-tag {
  position: absolute; top: 16px; left: 16px;
  background: var(--primary); color: #fff;
  font-size: 13px; font-weight: 700;
  padding: 5px 14px;
  border-radius: 100px;
}
.product-body { padding: 26px 28px 30px; flex: 1; display: flex; flex-direction: column; }
.product-body h3 { font-size: 22px; color: var(--dark); margin-bottom: 6px; }
.product-body .en { font-size: 13px; color: var(--text-light); margin-bottom: 14px; letter-spacing: 0.5px; }
.product-body p { font-size: 15px; color: var(--text-light); margin-bottom: 18px; flex: 1; }
.product-feats { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 20px; }
.product-feats span {
  font-size: 13px;
  color: var(--primary);
  background: var(--primary-light);
  padding: 4px 12px;
  border-radius: 6px;
}
.product-link { color: var(--primary); font-weight: 600; font-size: 15px; display: inline-flex; align-items: center; gap: 6px; }
.product-link:hover { gap: 10px; }

/* ---------- 特性/优势 ---------- */
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.feature-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 34px 28px;
  transition: all 0.3s;
}
.feature-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); }
.feature-icon {
  width: 58px; height: 58px;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--primary-light), #dceafc);
  display: flex; align-items: center; justify-content: center;
  font-size: 26px;
  margin-bottom: 20px;
}
.feature-card h3 { font-size: 19px; color: var(--dark); margin-bottom: 10px; }
.feature-card p { font-size: 14.5px; color: var(--text-light); }

/* ---------- 痛点方案 ---------- */
.pain-list { display: grid; grid-template-columns: 1fr 1fr; gap: 26px; }
.pain-item {
  background: #fff;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  padding: 30px 30px;
  position: relative;
  overflow: hidden;
}
.pain-item::before {
  content: "";
  position: absolute; left: 0; top: 0; bottom: 0; width: 4px;
  background: linear-gradient(to bottom, var(--primary), var(--accent));
}
.pain-item .no { font-size: 13px; font-weight: 800; color: var(--accent); letter-spacing: 2px; }
.pain-item h3 { font-size: 18.5px; color: var(--dark); margin: 8px 0 8px; }
.pain-item .pain-desc { font-size: 14px; color: var(--text-light); margin-bottom: 12px; }
.pain-item .solution { font-size: 14.5px; color: var(--text); background: var(--bg-light); border-radius: 10px; padding: 14px 16px; }
.pain-item .solution b { color: var(--primary); }

/* ---------- 应用行业 ---------- */
.apps-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.app-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 20px;
  text-align: center;
  transition: all 0.3s;
}
.app-card:hover { transform: translateY(-5px); box-shadow: var(--shadow); }
.app-card .icon { font-size: 34px; margin-bottom: 12px; }
.app-card h4 { font-size: 16.5px; color: var(--dark); margin-bottom: 6px; }
.app-card p { font-size: 13.5px; color: var(--text-light); }

/* ---------- 专利证书 ---------- */
.patents-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.patent-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: all 0.35s;
  cursor: pointer;
  display: flex;
  flex-direction: column;
}
.patent-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); }
.patent-thumb { background: #f2f5f9; padding: 14px; }
.patent-thumb img { width: 100%; height: 300px; object-fit: contain; transition: transform 0.4s; }
.patent-card:hover .patent-thumb img { transform: scale(1.04); }
.patent-info { padding: 16px 18px 20px; border-top: 1px solid var(--border); }
.patent-info h4 { font-size: 15.5px; color: var(--dark); line-height: 1.5; margin-bottom: 8px; min-height: 46px; }
.patent-info .meta { font-size: 12.5px; color: var(--text-light); line-height: 1.8; }
.patent-info .meta b { color: var(--primary); font-weight: 600; }
.patent-zoom-hint {
  margin-top: 10px;
  font-size: 12.5px;
  color: var(--accent);
  display: inline-flex; align-items: center; gap: 5px;
}

/* ---------- FAQ ---------- */
.faq-list { max-width: 860px; margin: 0 auto; }
.faq-item {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 12px;
  margin-bottom: 14px;
  overflow: hidden;
  transition: box-shadow 0.3s;
}
.faq-item.open { box-shadow: var(--shadow); border-color: transparent; }
.faq-q {
  width: 100%;
  background: none; border: none;
  text-align: left;
  padding: 20px 24px;
  font-size: 16.5px;
  font-weight: 600;
  color: var(--dark);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  font-family: inherit;
}
.faq-q .arrow { transition: transform 0.3s; color: var(--primary); flex-shrink: 0; font-size: 14px; }
.faq-item.open .arrow { transform: rotate(180deg); }
.faq-a { max-height: 0; overflow: hidden; transition: max-height 0.4s ease; }
.faq-a-inner { padding: 0 24px 22px; font-size: 15px; color: var(--text-light); }

/* ---------- 关于/工厂 ---------- */
.about-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}
.about-split .media { border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); background: #f0f2f5; display: flex; align-items: center; justify-content: center; }
.about-split .media img { display: block; width: 100%; height: auto; }
.about-split .content h2 { font-size: 32px; color: var(--dark); margin-bottom: 18px; }
.about-split .content p { margin-bottom: 14px; color: var(--text-light); font-size: 15.5px; }
.check-list { margin: 18px 0 26px; }
.check-list li {
  padding-left: 30px;
  position: relative;
  margin-bottom: 10px;
  color: var(--text);
  font-size: 15px;
}
.check-list li::before {
  content: "✓";
  position: absolute; left: 0; top: 0;
  width: 20px; height: 20px;
  background: var(--primary-light);
  color: var(--primary);
  border-radius: 6px;
  font-size: 12px;
  display: flex; align-items: center; justify-content: center;
  font-weight: 800;
}

/* ---------- 新闻列表 ---------- */
.news-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 26px; }
.news-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 30px;
  transition: all 0.3s;
  display: flex; flex-direction: column;
}
.news-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); }
.news-card .date { font-size: 13px; color: var(--accent); font-weight: 600; margin-bottom: 10px; }
.news-card h3 { font-size: 19.5px; color: var(--dark); line-height: 1.5; margin-bottom: 12px; }
.news-card p { font-size: 14.5px; color: var(--text-light); flex: 1; margin-bottom: 16px; }

/* ---------- 文章页 ---------- */
.article-wrap { max-width: 860px; margin: 0 auto; padding: 64px 24px 90px; }
.article-wrap .crumb { font-size: 13.5px; color: var(--text-light); margin-bottom: 26px; }
.article-wrap .crumb a { color: var(--primary); }
.article-wrap h1 { font-size: 32px; color: var(--dark); line-height: 1.4; margin-bottom: 14px; }
.article-meta { font-size: 13.5px; color: var(--text-light); margin-bottom: 36px; padding-bottom: 22px; border-bottom: 1px solid var(--border); }
.article-body h2 { font-size: 23px; color: var(--dark); margin: 38px 0 16px; padding-left: 14px; border-left: 4px solid var(--primary); }
.article-body h3 { font-size: 18.5px; color: var(--dark); margin: 26px 0 12px; }
.article-body p { margin-bottom: 15px; font-size: 15.5px; }
.article-body ul { margin: 0 0 16px 4px; }
.article-body ul li { padding-left: 22px; position: relative; margin-bottom: 8px; font-size: 15.5px; }
.article-body ul li::before { content: "•"; position: absolute; left: 4px; color: var(--primary); font-weight: 800; }
.article-body table { width: 100%; border-collapse: collapse; margin: 20px 0 26px; font-size: 14.5px; }
.article-body th { background: var(--primary); color: #fff; padding: 12px 14px; text-align: left; font-weight: 600; }
.article-body td { padding: 11px 14px; border-bottom: 1px solid var(--border); }
.article-body tr:nth-child(even) td { background: var(--bg-light); }
.article-cta {
  margin-top: 44px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: var(--radius);
  padding: 30px 34px;
  color: #fff;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}
.article-cta h3 { font-size: 20px; margin-bottom: 4px; }
.article-cta p { font-size: 14px; opacity: 0.9; }
.article-cta .btn { background: #fff; color: var(--primary); }

/* ---------- 联系我们 ---------- */
.contact-layout { display: grid; grid-template-columns: 1fr 1.15fr; gap: 44px; align-items: start; }
.contact-info-card {
  background: linear-gradient(160deg, var(--primary) 0%, var(--primary-dark) 100%);
  border-radius: var(--radius);
  color: #fff;
  padding: 40px 36px;
  box-shadow: 0 16px 44px rgba(26, 86, 168, 0.35);
}
.contact-info-card h3 { font-size: 22px; margin-bottom: 8px; }
.contact-info-card .sub { opacity: 0.85; font-size: 14px; margin-bottom: 28px; }
.contact-line { display: flex; gap: 14px; margin-bottom: 22px; align-items: flex-start; }
.contact-line .ico {
  width: 42px; height: 42px; flex-shrink: 0;
  background: rgba(255,255,255,0.14);
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-size: 18px;
}
.contact-line b { display: block; font-size: 15px; margin-bottom: 2px; }
.contact-line span { font-size: 14px; opacity: 0.9; }
.contact-form {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 38px 36px;
  box-shadow: var(--shadow);
}
.contact-form h3 { font-size: 21px; color: var(--dark); margin-bottom: 6px; }
.contact-form .sub { font-size: 14px; color: var(--text-light); margin-bottom: 26px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-group { margin-bottom: 18px; }
.form-group label { display: block; font-size: 14px; font-weight: 600; color: var(--dark); margin-bottom: 7px; }
.form-group label i { color: #e5484d; font-style: normal; }
.form-group input, .form-group textarea, .form-group select {
  width: 100%;
  padding: 12px 16px;
  border: 1.5px solid var(--border);
  border-radius: 10px;
  font-size: 15px;
  font-family: inherit;
  color: var(--dark);
  outline: none;
  transition: border 0.25s, box-shadow 0.25s;
  background: #fbfdff;
}
.form-group input:focus, .form-group textarea:focus, .form-group select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(26, 86, 168, 0.1);
}
.form-group textarea { min-height: 110px; resize: vertical; }
.form-success {
  display: none;
  background: #ecfdf3;
  border: 1px solid #abefc6;
  color: #067647;
  padding: 14px 18px;
  border-radius: 10px;
  font-size: 14.5px;
  margin-top: 16px;
}

/* ---------- CTA 条 ---------- */
.cta-band {
  background: linear-gradient(120deg, #10305c 0%, #1a56a8 55%, #2f7de1 100%);
  color: #fff;
  padding: 68px 0;
}
.cta-band .inner { display: flex; justify-content: space-between; align-items: center; gap: 30px; flex-wrap: wrap; }
.cta-band h2 { font-size: 30px; margin-bottom: 8px; }
.cta-band p { opacity: 0.88; font-size: 15.5px; }
.cta-band .btn { background: #fff; color: var(--primary); font-size: 16px; }

/* ---------- 页脚 ---------- */
footer.footer { background: #0d1f38; color: #9fb2c9; padding: 64px 0 0; }
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: 40px;
  padding-bottom: 46px;
}
.footer h4 { color: #fff; font-size: 16.5px; margin-bottom: 18px; font-weight: 600; }
.footer .brand b { color: #fff; font-size: 22px; letter-spacing: 1px; display: block; margin-bottom: 4px; }
.footer .brand .cn { color: #cfdcef; font-size: 14px; margin-bottom: 16px; }
.footer p { font-size: 13.8px; line-height: 1.9; }
.footer ul li { margin-bottom: 11px; font-size: 14px; }
.footer ul a:hover { color: #fff; }
.footer .contact-list li { display: flex; gap: 10px; font-size: 13.8px; line-height: 1.8; }
.footer .contact-list .fi { flex-shrink: 0; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding: 20px 0;
  font-size: 13px;
}
.footer-bottom .container { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; }
.footer-bottom a:hover { color: #fff; }

/* ---------- 灯箱 ---------- */
.lightbox {
  display: none;
  position: fixed; inset: 0; z-index: 2000;
  background: rgba(10, 22, 40, 0.88);
  backdrop-filter: blur(6px);
  align-items: center; justify-content: center;
  padding: 40px;
  flex-direction: column;
  gap: 16px;
}
.lightbox.show { display: flex; }
.lightbox img {
  max-width: min(880px, 92vw);
  max-height: 82vh;
  object-fit: contain;
  border-radius: 8px;
  box-shadow: 0 30px 80px rgba(0,0,0,0.5);
  background: #fff;
}
.lightbox .lb-title { color: #dce7f5; font-size: 15px; text-align: center; }
.lightbox .lb-close {
  position: absolute; top: 22px; right: 30px;
  background: rgba(255,255,255,0.12);
  color: #fff; border: none;
  width: 44px; height: 44px; border-radius: 50%;
  font-size: 20px; cursor: pointer;
  transition: background 0.25s;
}
.lightbox .lb-close:hover { background: rgba(255,255,255,0.25); }

/* ---------- 面包屑/页头 ---------- */
.page-hero {
  background: linear-gradient(120deg, #f0f6fe 0%, #e3eefb 100%);
  padding: 64px 0 56px;
  position: relative;
  overflow: hidden;
}
.page-hero .crumb { font-size: 13.5px; color: var(--text-light); margin-bottom: 14px; }
.page-hero .crumb a { color: var(--primary); }
.page-hero h1 { font-size: 38px; color: var(--dark); }
.page-hero p { color: var(--text-light); margin-top: 10px; max-width: 640px; font-size: 16px; }
.page-hero::after {
  content: "AIBEND";
  position: absolute;
  right: -30px; bottom: -32px;
  font-size: 150px;
  font-weight: 800;
  color: rgba(26, 86, 168, 0.05);
  letter-spacing: 8px;
  pointer-events: none;
  white-space: nowrap;
}

/* ---------- 规格表 ---------- */
.spec-table { width: 100%; border-collapse: collapse; font-size: 14.5px; background: #fff; }
.spec-table th, .spec-table td { padding: 12px 16px; border-bottom: 1px solid var(--border); text-align: left; }
.spec-table th { background: var(--primary-light); color: var(--primary-dark); font-weight: 600; white-space: nowrap; }
.spec-table tr:hover td { background: #f7fafe; }

/* 多型号对照表：可横向滚动 */
.spec-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; border: 1px solid var(--border); border-radius: 10px; }
.spec-scroll .spec-table { min-width: 760px; font-size: 13.5px; }
.spec-scroll .spec-table th, .spec-scroll .spec-table td { padding: 10px 12px; text-align: center; white-space: nowrap; }
.spec-scroll .spec-table th:first-child, .spec-scroll .spec-table td:first-child { text-align: left; position: sticky; left: 0; background: #fff; box-shadow: 2px 0 4px rgba(0,0,0,0.04); }
.spec-scroll .spec-table th:first-child { background: var(--primary-light); }
.spec-scroll .spec-table td:nth-child(2) { text-align: left; white-space: normal; min-width: 120px; }
.spec-note { font-size: 13px; color: #888; margin-top: 8px; }

/* ---------- 产品详情块 ---------- */
.product-detail {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 44px;
}
.pd-head {
  display: grid; grid-template-columns: 1.3fr 1fr; gap: 0;
  align-items: stretch;
  background: linear-gradient(120deg, #101821 0%, #1c2a3a 100%);
}
.pd-head .media { position: relative; min-height: 380px; background: #ffffff; display: flex; align-items: center; justify-content: center; }
.pd-head .media img { position: relative; max-width: 100%; max-height: 100%; width: auto; height: auto; object-fit: contain; padding: 16px; }
.pd-head .info { padding: 46px 44px; color: #fff; display: flex; flex-direction: column; justify-content: center; }
.pd-head .info .series { color: #7db4f5; font-weight: 700; letter-spacing: 2px; font-size: 13.5px; margin-bottom: 10px; }
.pd-head .info h2 { font-size: 28px; color: #fff; margin-bottom: 6px; }
.pd-head .info .en { color: #8fa5bd; font-size: 13.5px; margin-bottom: 18px; }
.pd-head .info p { color: #b9c8da; font-size: 15px; margin-bottom: 22px; }
.pd-feats { display: grid; grid-template-columns: 1fr 1fr; gap: 10px 18px; }
.pd-feats li {
  font-size: 14px; color: #d7e3f0;
  padding-left: 22px; position: relative;
}
.pd-feats li::before { content: "▸"; position: absolute; left: 0; color: #5b9ce8; }
.pd-body { padding: 34px 40px 40px; }
.pd-body h3 { font-size: 19px; color: var(--dark); margin: 26px 0 14px; }
.pd-body h3:first-child { margin-top: 0; }

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .hero h1 { font-size: 36px; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .apps-grid { grid-template-columns: repeat(2, 1fr); }
  .patents-grid { grid-template-columns: repeat(2, 1fr); }
  .pd-head { grid-template-columns: 1fr; }
  .pd-head .media { min-height: 280px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute; top: 92px; left: 0; right: 0;
    background: #fff;
    flex-direction: column;
    align-items: stretch;
    padding: 14px 24px 20px;
    border-bottom: 1px solid var(--border);
    box-shadow: 0 20px 40px rgba(15,37,64,0.12);
  }
  .nav-links.open { display: flex; }
  .nav-cta { margin: 8px 0 0; text-align: center; justify-content: center; }
  .nav-toggle { display: flex; }
  .hero-inner { grid-template-columns: 1fr; padding-top: 48px; min-height: unset; }
  .hero h1 { font-size: 30px; }
  .products-grid, .pain-list, .news-grid, .contact-layout, .about-split { grid-template-columns: 1fr; }
  .feature-grid, .apps-grid, .patents-grid { grid-template-columns: 1fr 1fr; }
  .form-row { grid-template-columns: 1fr; }
  section.section { padding: 60px 0; }
  .sec-head h2 { font-size: 27px; }
  .page-hero h1 { font-size: 28px; }
  .stat-num { font-size: 34px; }
}
@media (max-width: 520px) {
  .feature-grid, .apps-grid, .patents-grid, .stats-grid { grid-template-columns: 1fr; }
  .patent-thumb img { height: auto; }
}