/* ============================================================
 * 公司官网 全局样式 —— 纯静态站点，无任何依赖
 * 主色：深海军蓝 + 科技蓝 + 青色点缀
 * ============================================================ */

:root {
  --c-navy: #0a1f3d;
  --c-navy-2: #0e2b52;
  --c-primary: #1554c0;
  --c-primary-dark: #0f3f95;
  --c-accent: #22d3ee;
  --c-accent-soft: #e0f7ff;
  --c-bg-light: #f5f8fc;
  --c-border: #e3eaf3;
  --c-text: #1f2937;
  --c-text-muted: #64748b;
  --c-white: #ffffff;
  --radius: 14px;
  --shadow-sm: 0 2px 10px rgba(10, 31, 61, 0.06);
  --shadow-md: 0 10px 30px rgba(10, 31, 61, 0.10);
  --shadow-lg: 0 18px 50px rgba(10, 31, 61, 0.16);
  --font: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", "Helvetica Neue", Arial, sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  color: var(--c-text);
  background: var(--c-white);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------------- 按钮 ---------------- */
.btn {
  display: inline-block;
  padding: 12px 30px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.5px;
  border: 1.5px solid transparent;
  cursor: pointer;
  transition: all 0.25s ease;
  white-space: nowrap;
}
.btn-primary {
  background: linear-gradient(135deg, var(--c-primary), #2f7bf0);
  color: #fff;
  box-shadow: 0 8px 20px rgba(21, 84, 192, 0.35);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 26px rgba(21, 84, 192, 0.45); }
.btn-light {
  background: var(--c-accent);
  color: var(--c-navy);
  font-weight: 700;
}
.btn-light:hover { transform: translateY(-2px); box-shadow: 0 12px 26px rgba(34, 211, 238, 0.4); }
.btn-outline {
  border-color: rgba(255, 255, 255, 0.55);
  color: #fff;
}
.btn-outline:hover { background: rgba(255, 255, 255, 0.12); border-color: #fff; }
.btn-ghost {
  border-color: var(--c-primary);
  color: var(--c-primary);
}
.btn-ghost:hover { background: var(--c-accent-soft); }

/* ---------------- 顶部导航 ---------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--c-border);
  transition: box-shadow 0.3s ease;
}
.site-header.scrolled { box-shadow: var(--shadow-md); }

.header-inner {
  display: flex;
  align-items: center;
  height: 72px;
}

.brand { display: flex; align-items: center; gap: 12px; }
.brand-mark { width: 40px; height: 40px; flex: none; }
.brand-text { display: flex; flex-direction: column; line-height: 1.25; }
.brand-text strong { font-size: 19px; color: var(--c-navy); letter-spacing: 1px; }
.brand-text small { font-size: 10.5px; color: var(--c-text-muted); letter-spacing: 0.4px; }

.site-nav { display: flex; align-items: center; gap: 34px; margin-left: auto; }
.site-nav > a:not(.nav-cta) {
  font-size: 15.5px;
  font-weight: 500;
  color: #3b4a63;
  padding: 6px 2px;
  position: relative;
  transition: color 0.2s;
}
.site-nav > a:not(.nav-cta)::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 0;
  height: 2.5px;
  border-radius: 2px;
  background: var(--c-primary);
  transition: width 0.25s ease;
}
.site-nav > a:not(.nav-cta):hover { color: var(--c-primary); }
.site-nav > a:not(.nav-cta):hover::after,
.site-nav > a.active:not(.nav-cta)::after { width: 100%; }
.site-nav > a.active:not(.nav-cta) { color: var(--c-primary); font-weight: 700; }

.nav-cta { padding: 9px 22px; font-size: 14px; }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 42px;
  height: 42px;
  border: 1px solid var(--c-border);
  border-radius: 10px;
  background: #fff;
  cursor: pointer;
  padding: 10px 9px;
}
.nav-toggle span {
  display: block;
  height: 2.2px;
  border-radius: 2px;
  background: var(--c-navy);
  transition: all 0.25s;
}
.nav-open .nav-toggle span:nth-child(1) { transform: translateY(7.2px) rotate(45deg); }
.nav-open .nav-toggle span:nth-child(2) { opacity: 0; }
.nav-open .nav-toggle span:nth-child(3) { transform: translateY(-7.2px) rotate(-45deg); }

/* ---------------- 语言切换（右侧，含汉堡按钮） ---------------- */
.header-right {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-left: 22px;
  flex: none;
}
.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 13px;
  border-radius: 999px;
  border: 1px solid var(--c-border);
  background: #fff;
  color: #5b6b85;
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.5px;
  font-family: var(--font);
  cursor: pointer;
  white-space: nowrap;
  transition: color 0.2s, border-color 0.2s, box-shadow 0.2s;
}
.lang-switch:hover {
  color: var(--c-primary);
  border-color: var(--c-primary);
  box-shadow: 0 3px 10px rgba(21, 84, 192, 0.12);
}
.lang-switch svg { width: 14px; height: 14px; flex: none; }

/* ---------------- 首页 Hero ---------------- */
.hero {
  position: relative;
  overflow: hidden;
  background: linear-gradient(128deg, var(--c-navy) 0%, var(--c-navy-2) 45%, #123a7a 100%);
  color: #fff;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 620px 380px at 85% 20%, rgba(34, 211, 238, 0.16), transparent 65%),
    radial-gradient(ellipse 500px 500px at 10% 90%, rgba(21, 84, 192, 0.35), transparent 60%);
}
.hero-inner {
  position: relative;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  align-items: center;
  gap: 40px;
  min-height: 560px;
  padding: 70px 0 90px;
}
.hero-visual { display: flex; justify-content: center; }
.hero-visual svg { width: 100%; max-width: 520px; height: auto; filter: drop-shadow(0 24px 50px rgba(0, 0, 0, 0.35)); }

.hero-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 18px;
  border-radius: 999px;
  border: 1px solid rgba(34, 211, 238, 0.45);
  background: rgba(34, 211, 238, 0.10);
  color: var(--c-accent);
  font-size: 13.5px;
  letter-spacing: 2px;
  margin-bottom: 26px;
}
.hero-chip::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--c-accent);
  box-shadow: 0 0 12px var(--c-accent);
}
.hero h1 {
  font-size: 44px;
  line-height: 1.3;
  font-weight: 700;
  letter-spacing: 1px;
  margin-bottom: 20px;
}
.hero h1 em {
  font-style: normal;
  background: linear-gradient(90deg, #5eead4, var(--c-accent));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero p {
  font-size: 16.5px;
  color: rgba(255, 255, 255, 0.78);
  max-width: 520px;
  margin-bottom: 38px;
}
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }

/* ---------------- 数字亮点 ---------------- */
.stats { background: var(--c-bg-light); }
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  padding: 64px 0;
}
.stat-card {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  text-align: center;
  padding: 30px 16px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.25s, box-shadow 0.25s;
}
.stat-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.stat-value {
  font-size: 38px;
  font-weight: 800;
  background: linear-gradient(120deg, var(--c-primary), var(--c-accent));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.stat-label { margin-top: 6px; font-size: 14.5px; color: var(--c-text-muted); }

/* ---------------- 通用 Section ---------------- */
.section { padding: 88px 0; }
.section.alt { background: var(--c-bg-light); }

.section-head { text-align: center; max-width: 640px; margin: 0 auto 54px; }
.section-tag {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 4px;
  color: var(--c-primary);
  text-transform: uppercase;
  margin-bottom: 12px;
}
.section-title {
  font-size: 32px;
  font-weight: 700;
  color: var(--c-navy);
  letter-spacing: 1px;
  position: relative;
  padding-bottom: 16px;
}
.section-title::after {
  content: "";
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  bottom: 0;
  width: 52px;
  height: 4px;
  border-radius: 3px;
  background: linear-gradient(90deg, var(--c-primary), var(--c-accent));
}
.section-sub { margin-top: 16px; font-size: 15.5px; color: var(--c-text-muted); }

/* ---------------- 产品卡片与筛选 ---------------- */
.filters {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 44px;
}
.filter-btn {
  padding: 9px 24px;
  border-radius: 999px;
  border: 1px solid var(--c-border);
  background: #fff;
  color: #3b4a63;
  font-size: 14.5px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.22s;
  font-family: var(--font);
}
.filter-btn:hover { border-color: var(--c-primary); color: var(--c-primary); }
.filter-btn.active {
  background: linear-gradient(135deg, var(--c-primary), #2f7bf0);
  border-color: transparent;
  color: #fff;
  box-shadow: 0 6px 16px rgba(21, 84, 192, 0.3);
}

.products-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}
.product-card {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform 0.28s ease, box-shadow 0.28s ease;
}
.product-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.product-media {
  position: relative;
  aspect-ratio: 8 / 5;
  overflow: hidden;
  background: var(--c-navy);
}
.product-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}
.product-card:hover .product-media img { transform: scale(1.06); }
.product-body { padding: 22px 24px 26px; display: flex; flex-direction: column; flex: 1; }
.product-cat {
  align-self: flex-start;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 1px;
  color: var(--c-primary);
  background: var(--c-accent-soft);
  border-radius: 6px;
  padding: 3px 10px;
  margin-bottom: 12px;
}
.product-name { font-size: 19px; font-weight: 700; color: var(--c-navy); }
.product-en { font-size: 12.5px; color: var(--c-text-muted); letter-spacing: 0.6px; margin-bottom: 10px; }
.product-tagline {
  font-size: 14px;
  color: var(--c-text-muted);
  margin-bottom: 16px;
  flex: 1;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.product-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--c-primary);
  transition: gap 0.2s;
  display: inline-flex;
  gap: 6px;
  align-items: center;
}
.product-link:hover { color: var(--c-primary-dark); }

.section-foot { text-align: center; margin-top: 46px; }

/* ---------------- 关于我们（首页） ---------------- */
.about-teaser {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}
.about-figure {
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}
.about-figure svg { width: 100%; height: auto; display: block; }
.about-copy .section-head { text-align: left; margin: 0 0 26px; }
.about-copy .section-title::after { left: 0; transform: none; }
.about-copy p { color: var(--c-text-muted); margin-bottom: 14px; }
.checks { margin: 22px 0 30px; display: grid; gap: 12px; }
.checks li { display: flex; gap: 10px; align-items: flex-start; color: #33415c; font-size: 15px; }
.checks li::before {
  content: "✓";
  flex: none;
  width: 21px;
  height: 21px;
  border-radius: 50%;
  background: var(--c-accent-soft);
  color: var(--c-primary);
  font-size: 13px;
  font-weight: 800;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-top: 3px;
}

/* ---------------- 优势 ---------------- */
.adv-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 26px; }
.adv-card {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 34px 26px;
  text-align: center;
  transition: transform 0.25s, box-shadow 0.25s;
}
.adv-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-md); }
.adv-icon {
  width: 62px;
  height: 62px;
  margin: 0 auto 18px;
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, rgba(21, 84, 192, 0.10), rgba(34, 211, 238, 0.14));
}
.adv-icon svg { width: 30px; height: 30px; }
.adv-card h3 { font-size: 17.5px; color: var(--c-navy); margin-bottom: 10px; }
.adv-card p { font-size: 14px; color: var(--c-text-muted); }

/* ---------------- CTA 横幅 ---------------- */
.cta-band {
  background:
    radial-gradient(ellipse 500px 300px at 15% 30%, rgba(34, 211, 238, 0.18), transparent 60%),
    linear-gradient(120deg, var(--c-navy), #12366e);
  color: #fff;
  padding: 74px 0;
}
.cta-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
  flex-wrap: wrap;
}
.cta-inner h2 { font-size: 28px; letter-spacing: 1px; margin-bottom: 8px; }
.cta-inner p { color: rgba(255, 255, 255, 0.75); font-size: 15.5px; }

/* ---------------- 内页横幅 ---------------- */
.page-banner {
  background:
    radial-gradient(ellipse 560px 300px at 88% 10%, rgba(34, 211, 238, 0.15), transparent 60%),
    linear-gradient(120deg, var(--c-navy), #12366e);
  color: #fff;
  padding: 66px 0 58px;
  text-align: center;
}
.page-banner h1 { font-size: 34px; letter-spacing: 2px; margin-bottom: 10px; }
.page-banner p { color: rgba(255, 255, 255, 0.72); font-size: 15px; }
.breadcrumb {
  margin-top: 18px;
  font-size: 13.5px;
  color: rgba(255, 255, 255, 0.6);
  display: flex;
  justify-content: center;
  gap: 8px;
}
.breadcrumb a:hover { color: var(--c-accent); }
.breadcrumb .sep { opacity: 0.5; }
.breadcrumb .current { color: var(--c-accent); }

/* ---------------- 产品详情 ---------------- */
.pd-layout { padding: 70px 0 90px; }
.pd-crumb { font-size: 13.5px; color: var(--c-text-muted); margin-bottom: 34px; }
.pd-crumb a { color: var(--c-text-muted); }
.pd-crumb a:hover { color: var(--c-primary); }
.pd-crumb .sep { margin: 0 8px; opacity: 0.6; }

.pd-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 54px;
  align-items: start;
}
.pd-figure {
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  background: var(--c-navy);
}
.pd-figure img { width: 100%; display: block; }
.pd-info .product-cat { margin-bottom: 14px; }
.pd-title { font-size: 32px; color: var(--c-navy); letter-spacing: 1px; }
.pd-en { font-size: 14px; color: var(--c-text-muted); letter-spacing: 1px; margin: 4px 0 16px; }
.pd-tagline {
  font-size: 16px;
  color: var(--c-primary);
  font-weight: 600;
  margin-bottom: 18px;
}
.pd-desc { color: var(--c-text-muted); margin-bottom: 30px; }
.pd-actions { display: flex; gap: 14px; flex-wrap: wrap; }

.pd-section { margin-top: 58px; }
.pd-section h2 {
  font-size: 21px;
  color: var(--c-navy);
  letter-spacing: 1px;
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 12px;
}
.pd-section h2::before {
  content: "";
  width: 5px;
  height: 20px;
  border-radius: 3px;
  background: linear-gradient(180deg, var(--c-primary), var(--c-accent));
}
.feature-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.feature-grid li {
  background: var(--c-bg-light);
  border: 1px solid var(--c-border);
  border-radius: 10px;
  padding: 14px 18px;
  font-size: 14.5px;
  color: #33415c;
  display: flex;
  gap: 10px;
  align-items: flex-start;
}
.feature-grid li::before { content: "✓"; color: var(--c-primary); font-weight: 800; }

.spec-table {
  width: 100%;
  border-collapse: collapse;
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.spec-table th, .spec-table td {
  padding: 14px 22px;
  font-size: 14.5px;
  text-align: left;
  border-bottom: 1px solid var(--c-border);
}
.spec-table tr:last-child th, .spec-table tr:last-child td { border-bottom: none; }
.spec-table th {
  width: 200px;
  background: var(--c-bg-light);
  color: var(--c-navy);
  font-weight: 600;
}
.spec-table td { color: var(--c-text-muted); }

.related-products .products-grid { grid-template-columns: repeat(3, 1fr); }

.empty-state {
  text-align: center;
  padding: 90px 20px;
  color: var(--c-text-muted);
}
.empty-state h2 { color: var(--c-navy); font-size: 24px; margin-bottom: 12px; }
.empty-state .btn { margin-top: 22px; }

/* ---------------- 公司简介页 ---------------- */
.about-page { padding: 80px 0; }
.about-cols { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 56px; align-items: center; }
.about-cols .about-figure { margin-bottom: 34px; }
.about-text p { color: var(--c-text-muted); margin-bottom: 16px; }
.about-text h2 { font-size: 24px; color: var(--c-navy); margin: 30px 0 16px; letter-spacing: 1px; }

.timeline { position: relative; max-width: 760px; margin: 0 auto; padding-left: 34px; }
.timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 6px;
  bottom: 6px;
  width: 2.5px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--c-primary), var(--c-accent));
}
.timeline li { position: relative; padding: 0 0 34px 22px; }
.timeline li::before {
  content: "";
  position: absolute;
  left: -34px;
  top: 7px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: #fff;
  border: 3.5px solid var(--c-primary);
  box-shadow: 0 0 0 5px rgba(21, 84, 192, 0.12);
}
.timeline time { font-size: 15px; font-weight: 800; color: var(--c-primary); letter-spacing: 1px; }
.timeline h3 { font-size: 17px; color: var(--c-navy); margin: 4px 0 6px; }
.timeline p { font-size: 14.5px; color: var(--c-text-muted); }

.values-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.value-card {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 34px 28px;
  text-align: center;
  transition: transform 0.25s, box-shadow 0.25s;
}
.value-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-md); }
.value-card .num {
  font-size: 30px;
  font-weight: 800;
  color: transparent;
  background: linear-gradient(120deg, var(--c-primary), var(--c-accent));
  -webkit-background-clip: text;
  background-clip: text;
  margin-bottom: 12px;
}
.value-card h3 { font-size: 18px; color: var(--c-navy); margin-bottom: 10px; }
.value-card p { font-size: 14px; color: var(--c-text-muted); }

/* ---------------- 联系页 ---------------- */
.contact-section { padding: 80px 0 90px; }
.contact-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; margin-bottom: 60px; }
.contact-card {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 30px 26px;
  text-align: center;
  box-shadow: var(--shadow-sm);
  transition: transform 0.25s, box-shadow 0.25s;
}
.contact-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.contact-icon {
  width: 54px;
  height: 54px;
  margin: 0 auto 16px;
  border-radius: 14px;
  background: linear-gradient(135deg, rgba(21, 84, 192, 0.10), rgba(34, 211, 238, 0.14));
  display: flex;
  align-items: center;
  justify-content: center;
}
.contact-icon svg { width: 26px; height: 26px; }
.contact-card h3 { font-size: 16.5px; color: var(--c-navy); margin-bottom: 8px; }
.contact-card p, .contact-card a { font-size: 14.5px; color: var(--c-text-muted); }
.contact-card a:hover { color: var(--c-primary); }

.contact-panel {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 50px;
  align-items: start;
}
.contact-side h2 { font-size: 26px; color: var(--c-navy); margin-bottom: 14px; letter-spacing: 1px; }
.contact-side p { color: var(--c-text-muted); margin-bottom: 26px; }
.contact-side li {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  padding: 14px 0;
  border-bottom: 1px dashed var(--c-border);
  font-size: 15px;
  color: #33415c;
}
.contact-side li strong { color: var(--c-navy); flex: none; width: 84px; }

.contact-form {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 38px;
  box-shadow: var(--shadow-md);
}
.contact-form h3 { font-size: 20px; color: var(--c-navy); margin-bottom: 6px; }
.contact-form > p { font-size: 13.5px; color: var(--c-text-muted); margin-bottom: 24px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.form-group { margin-bottom: 18px; }
.form-group label { display: block; font-size: 13.5px; font-weight: 600; color: #33415c; margin-bottom: 7px; }
.form-group label em { color: #e11d48; font-style: normal; margin-left: 3px; }
.form-control {
  width: 100%;
  padding: 12px 15px;
  border: 1.5px solid var(--c-border);
  border-radius: 10px;
  font-size: 14.5px;
  font-family: var(--font);
  color: var(--c-text);
  background: var(--c-bg-light);
  transition: border-color 0.2s, box-shadow 0.2s;
}
.form-control:focus {
  outline: none;
  border-color: var(--c-primary);
  background: #fff;
  box-shadow: 0 0 0 4px rgba(21, 84, 192, 0.10);
}
textarea.form-control { resize: vertical; min-height: 120px; }
.form-tip { font-size: 12.5px; color: var(--c-text-muted); margin-top: 14px; }

/* ---------------- 页脚 ---------------- */
.site-footer { background: var(--c-navy); color: rgba(255, 255, 255, 0.72); }
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 0.8fr 1fr 1.1fr;
  gap: 44px;
  padding: 70px 0 50px;
}
.footer-brand { display: flex; align-items: center; gap: 12px; margin-bottom: 18px; }
.footer-brand strong { font-size: 18px; color: #fff; letter-spacing: 1px; }
.footer-about p { font-size: 13.8px; margin-bottom: 8px; }
.footer-about .en { font-size: 12px; opacity: 0.55; letter-spacing: 0.5px; }
.footer-grid h4 {
  color: #fff;
  font-size: 15.5px;
  letter-spacing: 2px;
  margin-bottom: 20px;
  position: relative;
  padding-bottom: 10px;
}
.footer-grid h4::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 26px;
  height: 3px;
  border-radius: 2px;
  background: var(--c-accent);
}
.footer-grid li { margin-bottom: 11px; }
.footer-grid li a, .footer-grid li span { font-size: 13.8px; color: rgba(255, 255, 255, 0.66); transition: color 0.2s; }
.footer-grid li a:hover { color: var(--c-accent); }
.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.10);
  padding: 20px 0;
  font-size: 13px;
  text-align: center;
  color: rgba(255, 255, 255, 0.45);
}
.footer-bottom a:hover { color: var(--c-accent); }

/* ---------------- 入场动画 ---------------- */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity 0.7s ease, transform 0.7s ease; }
.reveal.visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
}

/* ---------------- 响应式 ---------------- */
@media (max-width: 1024px) {
  .hero h1 { font-size: 36px; }
  .adv-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 900px) {
  .nav-toggle { display: flex; }
  .site-nav {
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: #fff;
    border-bottom: 1px solid var(--c-border);
    box-shadow: var(--shadow-md);
    padding: 10px 24px 20px;
    display: none;
  }
  .site-nav.nav-expanded { display: flex; }
  .site-nav > a:not(.nav-cta) { padding: 13px 4px; border-bottom: 1px dashed var(--c-border); }
  .site-nav > a:not(.nav-cta)::after { display: none; }
  .site-nav .nav-cta { margin-top: 16px; text-align: center; }

  .hero-inner { grid-template-columns: 1fr; padding: 56px 0 66px; text-align: center; }
  .hero p { margin-left: auto; margin-right: auto; }
  .hero-actions { justify-content: center; }
  .hero-visual { display: none; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .products-grid, .related-products .products-grid { grid-template-columns: repeat(2, 1fr); }
  .about-teaser, .about-cols, .pd-grid, .contact-panel { grid-template-columns: 1fr; }
  .about-copy .section-head { text-align: center; }
  .about-copy .section-title::after { left: 50%; transform: translateX(-50%); }
  .values-grid { grid-template-columns: 1fr; }
}

@media (max-width: 600px) {
  .header-right { margin-left: 12px; gap: 10px; }
  .lang-switch { padding: 6px 10px; }
  .hero h1 { font-size: 29px; overflow-wrap: break-word; }
  .section { padding: 64px 0; }
  .section-title { font-size: 26px; }
  .stats-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
  .stat-card { padding: 22px 8px; }
  .stat-value { font-size: 30px; }
  .stat-label { font-size: 12.5px; }
  .products-grid, .related-products .products-grid,
  .adv-grid, .contact-grid, .feature-grid, .form-row { grid-template-columns: 1fr; }
  .pd-title { font-size: 26px; }
  .spec-table th, .spec-table td { padding: 12px 14px; }
  .spec-table th { width: 120px; }
  .footer-grid { grid-template-columns: 1fr; gap: 34px; }
  .cta-inner { text-align: center; justify-content: center; }
  .contact-form { padding: 26px 20px; }
}