/* ============================================================
   沧州木仁科技有限公司 · 电离辐射实验室  官方网站样式表
   Design tokens、布局、组件、响应式
   ============================================================ */

/* ---------- 1. 设计变量 ---------- */
:root {
  --color-primary: #0b3d91;        /* 主色：科技蓝（取自 LOGO/横幅） */
  --color-primary-dark: #082c69;
  --color-accent: #2d7dd2;
  --color-text: #1f2937;
  --color-text-soft: #4b5563;
  --color-muted: #6b7280;
  --color-border: #e5e7eb;
  --color-bg: #ffffff;
  --color-bg-alt: #f6f9ff;
  --color-bg-card: #ffffff;
  --shadow-sm: 0 1px 2px rgba(11, 61, 145, .06);
  --shadow-md: 0 6px 18px rgba(11, 61, 145, .10);
  --shadow-lg: 0 14px 40px rgba(11, 61, 145, .14);
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --container: 1200px;
  --space-section: 88px;
  --font-base: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Segoe UI",
               -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
  --transition: .25s ease;
}

/* ---------- 2. 全局基础 ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-base);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
img, svg { display: block; max-width: 100%; height: auto; }
a { color: var(--color-primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--color-primary-dark); }
button { font: inherit; cursor: pointer; }
h1, h2, h3, h4 { margin: 0 0 .5em; color: #0c1a3b; line-height: 1.3; }
p { margin: 0 0 1em; }

/* ---------- 3. 容器与栅格 ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}
.section { padding: var(--space-section) 0; }
.section-alt { background: var(--color-bg-alt); }
.section-head { text-align: center; margin-bottom: 48px; }
.section-head .eyebrow {
  display: inline-block;
  font-size: 13px;
  letter-spacing: .25em;
  color: var(--color-accent);
  text-transform: uppercase;
  margin-bottom: 10px;
  font-weight: 600;
}
.section-head h2 {
  font-size: clamp(26px, 3vw, 36px);
  font-weight: 700;
  margin: 0 0 12px;
}
.section-head p {
  color: var(--color-text-soft);
  max-width: 720px;
  margin: 0 auto;
}
.grid {
  display: grid;
  gap: 24px;
}
.grid-2 { grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.grid-4 { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }

/* ---------- 4. 顶部 Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, .92);
  backdrop-filter: saturate(160%) blur(8px);
  border-bottom: 1px solid var(--color-border);
}
.site-header .container {
  display: flex;
  align-items: center;
}
.header-top {
  justify-content: space-between;
  height: 92px;
  border-bottom: 1px solid var(--color-border);
}
.header-nav {
  position: relative;
  justify-content: center;
  gap: 4px;
  height: 56px;
  background: var(--color-primary);
  border-radius: 10px;
  margin: 4px 0 6px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 16px;
  font-weight: 700;
  color: #0c1a3b;
}
.brand img { width: 84px; height: auto; }
.brand-text { line-height: 1.12; display: flex; flex-direction: column; }
.brand-text .name { font-size: 30px; letter-spacing: 1px; }
.brand-text .dept { font-size: 14px; color: var(--color-text-soft); font-weight: 500; margin-top: 5px; }

.nav {
  display: flex;
  gap: 4px;
}
.nav a {
  position: relative;
  padding: 12px 18px;
  color: #fff;
  font-size: 17px;
  font-weight: 600;
  border-radius: 8px;
  letter-spacing: 1px;
  transition: background-color .15s ease;
}
.nav a:hover { background: rgba(255,255,255,.16); color: #fff; }
.nav a.active { color: #fff; background: rgba(255,255,255,.10); }
.nav a.active::after {
  content: "";
  position: absolute;
  left: 18px; right: 18px; bottom: 6px;
  height: 3px;
  background: #fff;
  border-radius: 2px;
}
.header-phone {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-left: 16px;
  font-size: 27px;
  color: var(--color-primary);
  font-weight: 800;
  white-space: nowrap;
}
.header-phone::before {
  content: "📞";
  font-size: 25px;
}
.menu-toggle {
  display: none;
  background: none;
  border: 0;
  padding: 8px;
  margin-left: auto;
  color: #fff;
  font-size: 22px;
  line-height: 1;
}

/* ---------- 5. 首页大图轮播 ---------- */
/* 首页顶部简介横幅：轮播图已去除，改为较矮的浅色底 + 深色文案 */
.hero {
  background: var(--color-bg-alt);
  border-bottom: 1px solid var(--color-border);
  padding: clamp(28px, 4vw, 52px) 0;
}
.hero-caption {
  max-width: 1200px;
  text-align: center;
  margin: 0 auto;
}
.hero-caption .hero-headline {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: clamp(10px, 1.6vw, 18px);
  color: #0c1a3b;
  font-size: clamp(26px, 3.6vw, 44px);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: .02em;
  margin: 0;
}
.hero-caption .hero-headline .dot {
  color: var(--color-primary);
  font-weight: 800;
  line-height: 1;
}

/* ---------- 6. 关于我们 ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1.1fr .9fr;
  gap: 56px;
  align-items: center;
}
.about-text .about-item { margin-bottom: 28px; }
.about-text .about-item:last-child { margin-bottom: 0; }
.about-text .about-item h3 {
  font-size: 22px;
  color: var(--color-primary);
  font-weight: 700;
  margin: 0 0 12px;
  padding-left: 14px;
  border-left: 4px solid var(--color-primary);
  line-height: 1.4;
}
.about-text .about-item p { margin: 0; color: var(--color-text-soft); line-height: 1.85; }
.about-images {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: 1fr;
  gap: 12px;
  height: 360px;
}
.about-images figure { margin: 0; overflow: hidden; border-radius: var(--radius-md); box-shadow: var(--shadow-sm); }
.about-images figure img { width: 100%; height: 100%; object-fit: cover; transition: transform .6s ease; }
.about-images figure:hover img { transform: scale(1.04); }

/* ---------- 7. 卡片通用 ---------- */
.card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: #c9d8f5;
}
.card h3 {
  font-size: 18px;
  color: var(--color-primary);
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.card .badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 28px;
  height: 28px;
  padding: 0 8px;
  background: var(--color-primary);
  color: #fff;
  font-size: 14px;
  font-weight: 700;
  border-radius: 6px;
}
.card p { color: var(--color-text-soft); font-size: 15px; margin: 0; }
.card .meta {
  margin-top: 10px;
  font-size: 13px;
  color: var(--color-muted);
}

/* ---------- 8. 技术能力 ---------- */
.capability {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 24px;
  background: var(--color-bg-card);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
}
.capability:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }
.capability .thumb {
  position: relative;
  background: var(--color-bg-alt);
  border-radius: var(--radius-sm);
  overflow: hidden;
  aspect-ratio: 4 / 3;
}
.capability .thumb svg { display: block; width: 100%; height: 100%; }
.capability .num-tag {
  position: absolute;
  top: 12px; left: 14px;
  display: inline-flex; align-items: center; justify-content: center;
  min-width: 30px; height: 24px; padding: 0 8px;
  background: var(--color-primary);
  color: #fff;
  font-size: 12px; font-weight: 700;
  border-radius: 6px;
  letter-spacing: .04em;
}
.capability h3 { color: #0c1a3b; font-size: 18px; margin: 0 0 8px; }
.capability .rule {
  display: inline-block;
  font-size: 12px;
  color: var(--color-primary);
  background: #eaf1ff;
  padding: 2px 10px;
  border-radius: 999px;
  margin-bottom: 10px;
}
.capability p { color: var(--color-text-soft); font-size: 14px; margin: 0 0 8px; }
.capability .models {
  font-size: 13px;
  color: var(--color-muted);
  border-top: 1px dashed var(--color-border);
  padding-top: 10px;
  margin-top: 10px;
}

.cap-group { margin: 44px 0; }
.cap-group:first-of-type { margin-top: 8px; }
.cap-group-title {
  font-size: 20px;
  color: #0c1a3b;
  margin: 0 0 20px;
  padding-left: 12px;
  border-left: 4px solid var(--color-primary);
}

/* ---------- 9. 设备展示 ---------- */
.equipment {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition), box-shadow var(--transition);
}
.equipment:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }
.equipment .thumb {
  aspect-ratio: 4 / 3;
  background: var(--color-bg-alt);
  position: relative;
  overflow: hidden;
}
.equipment .thumb img { width: 100%; height: 100%; object-fit: cover; display: block; }
.equipment .thumb .eq-badge {
  position: absolute;
  top: 10px; left: 10px;
  min-width: 30px; height: 22px; padding: 0 8px;
  border-radius: 6px;
  background: var(--color-primary);
  color: #fff;
  font-size: 12px; font-weight: 700;
  display: inline-flex; align-items: center; justify-content: center;
  letter-spacing: .03em;
  box-shadow: 0 2px 6px rgba(11, 61, 145, .28);
}
.equipment .body { padding: 16px 18px 20px; }
.equipment h3 { font-size: 16px; color: #0c1a3b; margin: 0 0 8px; }
.equipment p { font-size: 13px; color: var(--color-text-soft); margin: 0; line-height: 1.6; }

/* ---------- 10. 客户服务 ---------- */
.service { text-align: center; padding: 32px 24px; }
.service .icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  color: #fff;
  font-size: 28px;
}
.service h3 { justify-content: center; }

/* ---------- 11. 公司荣誉 ---------- */
.honors {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
}
.honor {
  background: var(--color-bg-card);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
}
.honor:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }
.honor .frame {
  background: linear-gradient(135deg, #f4f7fc, #e6efff);
  aspect-ratio: 3 / 4;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}
.honor .frame img { max-height: 100%; border-radius: 6px; box-shadow: var(--shadow-md); }
.honor .body { padding: 20px 22px 24px; }
.honor h3 { font-size: 17px; margin: 0 0 10px; color: #0c1a3b; }
.honor p { font-size: 14px; color: var(--color-text-soft); margin: 0; }

/* ---------- 12. 联系我们 ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 32px;
  align-items: stretch;
}
.contact-info {
  background: linear-gradient(160deg, var(--color-primary), var(--color-primary-dark));
  color: #fff;
  border-radius: var(--radius-md);
  padding: 32px 28px;
  box-shadow: var(--shadow-md);
}
.contact-info h3 { color: #fff; font-size: 22px; margin-bottom: 6px; }
.contact-info .sub { opacity: .85; margin-bottom: 20px; font-size: 14px; }
/* 「电离辐射实验室」→ 资料下载页链接
   外观要求：与改链接前的纯文字完全一致（无下划线、无箭头、悬停不变色），
   仅保留可点击行为；键盘 Tab 聚焦时才给出可见焦点框（无障碍需要）。 */
.contact-info .sub a.dept-link {
  color: inherit;
  font-weight: inherit;
  text-decoration: none;
  border-bottom: 0;
  padding-bottom: 0;
}
.contact-info .sub a.dept-link:hover,
.contact-info .sub a.dept-link:focus,
.contact-info .sub a.dept-link:active,
.contact-info .sub a.dept-link:visited {
  color: inherit;
  text-decoration: none;
  border-bottom: 0;
}
.contact-info .sub a.dept-link:focus-visible {
  outline: 2px solid rgba(255, 255, 255, .85);
  outline-offset: 3px;
  border-radius: 2px;
}
.contact-info ul { list-style: none; padding: 0; margin: 0; }
.contact-info li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid rgba(255, 255, 255, .15);
  font-size: 14px;
}
.contact-info li:last-child { border-bottom: 0; }
.contact-info li .ic {
  width: 22px; height: 22px;
  flex: 0 0 22px;
  display: flex; align-items: center; justify-content: center;
  background: rgba(255, 255, 255, .15);
  border-radius: 50%;
  font-size: 12px;
}
.contact-info .qr { text-align: center; margin-top: 18px; }
.contact-info .qr img { width: 110px; margin: 0 auto; border-radius: 6px; }
.contact-info .qr p { font-size: 12px; margin-top: 6px; opacity: .9; }

/* 送检办理卡：小程序码 */
.flow-card { text-align: center; align-items: center; }
.flow-title {
  display: block;
  text-align: center;
  max-width: 250px;
  margin: 0 auto 20px;
  font-size: 18px;
  line-height: 1.55;
  font-weight: 700;
  color: var(--color-primary);
}
.flow-qr { display: flex; flex-direction: column; align-items: center; gap: 10px; margin-top: 6px; }
.flow-qr img {
  width: 190px;
  height: 190px;
  border-radius: 12px;
  padding: 8px;
  background: #fff;
  border: 1px solid var(--color-border);
  box-shadow: 0 10px 28px rgba(8, 16, 40, .10);
}
.flow-qr p { font-size: 13px; color: var(--color-text-soft); margin: 0; }

.contact-map {
  margin-top: 28px;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: #fff;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}
/* iframe 由高德「嵌入地图」生成，必须 block 化以消除行内元素的基线间隙 */
.contact-map iframe {
  display: block;
  width: 100%;
  height: 450px;
  border: 0;
}
.map-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  padding: 14px 20px;
  border-top: 1px solid var(--color-border);
  background: var(--color-bg);
}
.map-bar .addr {
  font-size: 14px;
  color: var(--color-text-soft);
}
.map-bar .map-cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-primary);
  padding: 8px 14px;
  border-radius: 999px;
  border: 1px solid #c9d8f5;
  background: var(--color-bg-alt);
  transition: background var(--transition), border-color var(--transition);
}
.map-bar .map-cta:hover {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
}
.map-bar .map-cta::after {
  content: "→";
  font-size: 15px;
}

/* ---------- 13. Footer ---------- */
.site-footer {
  background: #0a1430;
  color: #c9d2e8;
  padding: 36px 0 24px;
  font-size: 14px;
}
.site-footer .row {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  align-items: center;
  justify-content: space-between;
}
.site-footer a { color: #c9d2e8; }
.site-footer a:hover { color: #fff; }
.site-footer .copy { opacity: .7; }
.site-footer .links { display: flex; gap: 18px; flex-wrap: wrap; }

/* ---------- 14. 回到顶部 ---------- */
.back-top {
  position: fixed;
  right: 24px; bottom: 24px;
  width: 44px; height: 44px;
  border: 0;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  font-size: 20px;
  box-shadow: var(--shadow-md);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition), transform var(--transition);
  z-index: 40;
}
.back-top.show { opacity: 1; pointer-events: auto; }
.back-top:hover { transform: translateY(-2px); background: var(--color-primary-dark); }

/* ---------- 15. 常见问题（FAQ 手风琴） ---------- */
.faq-list {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.faq-item {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.faq-item[open] {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-md);
}
.faq-item summary {
  list-style: none;
  cursor: pointer;
  position: relative;
  padding: 18px 56px 18px 22px;
  font-size: 16px;
  font-weight: 600;
  color: #0c1a3b;
  user-select: none;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  width: 26px; height: 26px;
  display: flex; align-items: center; justify-content: center;
  font-size: 20px; font-weight: 400;
  color: var(--color-primary);
  background: var(--color-bg-alt);
  border-radius: 50%;
  transition: transform var(--transition), background var(--transition);
}
.faq-item[open] summary::after {
  content: "\2212";
  background: var(--color-primary);
  color: #fff;
}
.faq-item summary:hover { color: var(--color-primary); }
.faq-item > p {
  margin: 0;
  padding: 0 22px 20px;
  color: var(--color-text-soft);
  font-size: 15px;
  line-height: 1.85;
}
.faq-item > p a { font-weight: 600; }

/* FAQ 区块底部 → 完整版 FAQ 专页入口（解决 gm-faq.html 孤儿页面问题） */
.faq-more {
  margin: 18px 0 0;
  padding: 16px 22px;
  border-top: 1px dashed var(--color-border);
  font-size: 15px;
  text-align: center;
}
.faq-more a {
  color: var(--color-primary);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 3px;
}
.faq-more a:hover { color: var(--color-primary-dark, var(--color-primary)); }

/* ---------- 15b. GM 计数管产品选型表 ---------- */
.gm-table-wrap {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  overflow-x: auto;
  background: var(--color-bg-card);
  -webkit-overflow-scrolling: touch;
}
.gm-table {
  width: 100%;
  min-width: 1140px;
  border-collapse: collapse;
  font-size: 14px;
  line-height: 1.6;
}
.gm-table.gm-table-mica {
  margin-top: 22px;
  min-width: 720px;
}
.gm-table.gm-table-mica thead th { background: #155d9b; }
/* 高压模块产品选型（并入 #products 的第二产品线） */
.hv-block {
  margin-top: 52px;
  padding-top: 44px;
  border-top: 1px solid var(--color-border);
}
.hv-title {
  font-size: 22px;
  color: var(--color-primary);
  font-weight: 700;
  text-align: center;
  margin: 0 0 26px;
  letter-spacing: .02em;
}
.gm-table-hv { min-width: 1040px; }
.gm-table.gm-table-hv thead th { background: #16739a; }
.gm-table thead th {
  position: sticky;
  top: 0;
  z-index: 1;
  background: var(--color-primary);
  color: #fff;
  text-align: left;
  font-weight: 600;
  padding: 13px 16px;
  white-space: nowrap;
  letter-spacing: .02em;
}
.gm-table tbody td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text);
  vertical-align: top;
}
.gm-table tbody tr:nth-child(even) { background: var(--color-bg-alt); }
.gm-table tbody tr:hover { background: rgba(11, 61, 145, .06); }
.gm-table td.model {
  font-weight: 700;
  color: var(--color-primary);
  white-space: nowrap;
  font-feature-settings: "tnum";
}
.gm-table td:first-child { white-space: nowrap; }
/* noscript 兜底表格（无外部 class 依赖，内联可读） */
.noscript-table {
  width: 100%;
  border-collapse: collapse;
  margin: 8px 0 18px;
  font-size: 14px;
}
.noscript-table th, .noscript-table td {
  border: 1px solid #ccc;
  padding: 8px 10px;
  text-align: left;
  vertical-align: top;
}
.noscript-table th { background: #0b3d91; color: #fff; }

/* 说明书下载链接（产品选型表） */
.gm-table td a.dl-link {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  background: var(--color-primary);
  color: #fff;
  font-size: 13px;
  font-weight: 600;
  padding: 6px 13px;
  border-radius: 6px;
  text-decoration: none;
  white-space: nowrap;
  transition: background .15s ease, transform .15s ease;
}
.gm-table td a.dl-link::before {
  content: "\2193";
  font-size: 13px;
  line-height: 1;
}
.gm-table td a.dl-link:hover { background: var(--color-primary-dark); transform: translateY(-1px); }
.gm-table td a.dl-link.dl-muted {
  background: transparent;
  color: var(--color-accent);
  border: 1px solid var(--color-accent);
}
.gm-table td a.dl-link.dl-muted:hover { background: rgba(45, 125, 210, .08); }
/* noscript 兜底表里的下载链接（无按钮底色，保持可读） */
.noscript-table a.dl-link { color: var(--color-primary); font-weight: 600; text-decoration: underline; }
.noscript-table a.dl-link.dl-muted { color: var(--color-text-soft); }

/* ---------- 16. 响应式 ---------- */
@media (max-width: 960px) {
  .nav { display: none; }
  .menu-toggle { display: inline-flex; }
  .header-top { height: 84px; }
  .brand img { width: 72px; }
  .brand-text .name { font-size: 25px; }
  .brand-text .dept { font-size: 12px; }
  .header-phone { font-size: 24px; }
  .header-phone::before { font-size: 22px; }
  .nav.open {
    display: flex;
    position: absolute;
    top: 100%; left: 0; right: 0;
    background: var(--color-primary);
    flex-direction: column;
    padding: 8px 16px 12px;
    border-bottom: 1px solid rgba(255,255,255,.25);
    box-shadow: var(--shadow-md);
  }
  .nav.open a { padding: 12px 14px; color: #fff; font-size: 16px; }
  .nav.open a.active::after { left: 14px; right: 14px; bottom: 4px; }

  .about-grid { grid-template-columns: 1fr; gap: 32px; }
  .capability { grid-template-columns: 1fr; }
  .capability .thumb { aspect-ratio: 16 / 9; }
  .contact-grid { grid-template-columns: 1fr; }
  .contact-map iframe { height: 360px; }
}
@media (max-width: 640px) {
  :root { --space-section: 64px; }
  .section-head { margin-bottom: 32px; }
  .container { padding: 0 16px; }
  .about-images { height: 280px; }
  .brand-text .name { font-size: 19px; letter-spacing: 0.5px; }
  .brand-text .dept { display: none; }
  .brand img { width: 62px; }
  .header-top { height: 76px; }
  .header-phone { font-size: 21px; }
  .contact-map { margin-top: 20px; }
  .contact-map iframe { height: 280px; }
  .map-bar { flex-direction: column; align-items: stretch; }
  .map-bar .map-cta { justify-content: center; }
  .hero-caption .hero-headline { font-size: clamp(22px, 5.6vw, 28px); gap: 8px; }
  .hero-caption .hero-headline .dot { display: none; }
}