/*
Theme Name: 源本商务主题
Theme URI: https://www.bj-1718.com
Author: Yuanben
Description: 精密仪器网站项目 - 同步自静态站最新设计
Version: 2.0.0
Text Domain: yuanben
*/

/* ========== CSS Reset & Variables ========== */
:root {
  --primary: #00a9ec;
  --primary-dark: #0088c6;
  --primary-light: rgba(0,169,236,0.08);
  --secondary: #1c1d22;
  --accent: #f39800;
  --text: #333333;
  --text-light: #666666;
  --text-lighter: #999999;
  --bg-light: #f5f7fa;
  --bg-white: #ffffff;
  --gray-100: #f5f5f5;
  --gray-500: #999;
  --gray-700: #555;
  --border: #e8e8e8;
  --shadow: 0 2px 20px rgba(0,0,0,0.08);
  --shadow-hover: 0 8px 30px rgba(0,0,0,0.15);
  --radius: 6px;
  --transition: all 0.3s ease;
  --max-width: 1200px;
  --header-height: 80px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
  color: var(--text); line-height: 1.6; background: var(--bg-white); overflow-x: hidden;
}
a { color: var(--primary); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--primary-dark); }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }
h1, h2, h3, h4, h5, h6 { font-weight: 600; line-height: 1.3; color: var(--text); }
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 20px; }

/* ========== Header ========== */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(255,255,255,0.98); box-shadow: 0 1px 10px rgba(0,0,0,0.06);
  transition: var(--transition); height: var(--header-height);
}
.site-header.scrolled { box-shadow: 0 2px 20px rgba(0,0,0,0.1); }
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: var(--header-height); max-width: var(--max-width); margin: 0 auto; padding: 0 20px;
}
.site-logo { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.logo-icon {
  width: 45px; height: 45px; background: var(--primary); color: #fff;
  border-radius: 8px; display: flex; align-items: center; justify-content: center;
  font-size: 18px; font-weight: 700;
}
.logo-text .cn { display: block; font-size: 16px; font-weight: 700; color: var(--text); }
.logo-text .en { display: block; font-size: 10px; color: var(--text-light); letter-spacing: 1px; }
.main-nav { display: flex; gap: 0; }
.main-nav a {
  display: block; padding: 8px 22px; color: var(--text); font-size: 15px;
  font-weight: 500; letter-spacing: 1px; border-bottom: 3px solid transparent;
}
.main-nav a:hover, .main-nav a.active { color: var(--primary); border-bottom-color: var(--primary); }
.nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: 10px; }
.nav-toggle span { display: block; width: 24px; height: 2px; background: var(--text); margin: 5px 0; transition: 0.3s; }

/* ========== Page Hero ========== */
.page-hero {
  margin-top: var(--header-height); padding: 60px 0;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff; text-align: center;
}
.page-hero h1 { font-size: 36px; color: #fff; margin-bottom: 10px; }
.breadcrumb { font-size: 14px; opacity: 0.8; }
.breadcrumb a { color: #fff; }

/* ========== Hero Banner (首页) ========== */
.hero-banner {
  position: relative; width: 100%; height: 700px; margin-top: var(--header-height);
  overflow: hidden;
}
.hero-slider { position: relative; width: 100%; height: 100%; }
.hero-slide {
  position: absolute; top: 0; left: 0; width: 100%; height: 100%;
  background-size: cover; background-position: center; opacity: 0;
  transition: opacity 1s ease;
}
.hero-slide.active { opacity: 1; }
.hero-overlay {
  position: absolute; top: 0; left: 0; width: 100%; height: 100%;
  background: rgba(0,0,0,0.45); display: flex; align-items: center; justify-content: center;
}
.hero-content { text-align: center; color: #fff; }
.hero-content h1 { font-size: 48px; color: #fff; margin-bottom: 16px; text-shadow: 0 2px 10px rgba(0,0,0,0.3); }
.hero-content p { font-size: 20px; opacity: 0.9; }
.hero-dots {
  position: absolute; bottom: 30px; left: 50%; transform: translateX(-50%);
  display: flex; gap: 12px; z-index: 10;
}
.hero-dot {
  width: 12px; height: 12px; border-radius: 50%; background: rgba(255,255,255,0.5);
  cursor: pointer; transition: 0.3s;
}
.hero-dot.active { background: #fff; transform: scale(1.2); }

/* ========== Sections ========== */
.section { padding: 80px 0; }
.section-alt { background: var(--bg-light); }
.section-header { text-align: center; margin-bottom: 50px; }
.section-header h2 { font-size: 32px; margin-bottom: 12px; }
.section-header p { color: var(--text-light); font-size: 16px; }
.section-padding { padding: 80px 0; }

/* ========== Advantages ========== */
.advantages-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 30px; }
.advantage-card {
  text-align: center; padding: 40px 24px; background: var(--bg-white);
  border-radius: var(--radius); box-shadow: var(--shadow); transition: var(--transition);
}
.advantage-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-hover); }
.advantage-icon { font-size: 40px; margin-bottom: 16px; color: var(--primary); }
.advantage-card h3 { font-size: 18px; margin-bottom: 10px; }
.advantage-card p { color: var(--text-light); font-size: 14px; line-height: 1.7; }

/* ========== Product Grid (首页) ========== */
.products-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.product-card {
  background: var(--bg-white); border-radius: var(--radius); overflow: hidden;
  box-shadow: var(--shadow); transition: var(--transition);
}
.product-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-hover); }
.product-card a { text-decoration: none; color: inherit; }
.product-img {
  width: 100%; height: 200px; overflow: hidden; background: var(--gray-100);
  display: flex; align-items: center; justify-content: center;
}
.product-img img {
  width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s ease;
}
.product-card:hover .product-img img { transform: scale(1.08); }
.product-info { padding: 16px; }
.product-info h3 { font-size: 15px; text-align: center; }

/* ========== Secondhand Grid (首页) ========== */
.secondhand-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
.secondhand-card {
  background: var(--bg-white); border-radius: var(--radius); overflow: hidden;
  box-shadow: var(--shadow); transition: var(--transition);
}
.secondhand-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-hover); }
.secondhand-card .card-img {
  width: 100%; height: 200px; overflow: hidden; background: var(--gray-100);
  display: flex; align-items: center; justify-content: center;
}
.secondhand-card .card-img img {
  width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s ease;
}
.secondhand-card:hover .card-img img { transform: scale(1.08); }
.secondhand-card .card-body { padding: 20px; }
.secondhand-card .card-body h3 { font-size: 17px; margin-bottom: 8px; }
.secondhand-card .card-body p { color: var(--text-light); font-size: 14px; line-height: 1.6; margin-bottom: 12px; }
.secondhand-card .card-meta { display: flex; justify-content: space-between; font-size: 13px; color: var(--text-lighter); }
.btn-primary {
  display: inline-block; padding: 10px 28px; background: var(--primary); color: #fff;
  border-radius: var(--radius); font-size: 14px; font-weight: 500; transition: var(--transition);
}
.btn-primary:hover { background: var(--primary-dark); color: #fff; }

/* ========== News Grid (首页) ========== */
.news-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
.news-card {
  background: var(--bg-white); border-radius: var(--radius); overflow: hidden;
  box-shadow: var(--shadow); transition: var(--transition);
}
.news-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-hover); }
.news-img {
  height: 180px; background: var(--primary-light); display: flex;
  align-items: center; justify-content: center; font-size: 48px;
}
.news-body { padding: 20px; }
.news-date { font-size: 13px; color: var(--text-lighter); margin-bottom: 8px; }
.news-body h3 { font-size: 16px; margin-bottom: 8px; }
.news-body h3 a { color: var(--text); }
.news-body h3 a:hover { color: var(--primary); }
.news-body p { font-size: 14px; color: var(--text-light); line-height: 1.7; }

/* ========== Products Page (产品中心) ========== */
.products-filter { display: flex; justify-content: center; gap: 10px; margin-bottom: 40px; flex-wrap: wrap; }
.filter-btn {
  padding: 8px 24px; border: 2px solid var(--border); background: #fff;
  border-radius: 30px; cursor: pointer; font-size: 14px; transition: 0.3s;
}
.filter-btn:hover, .filter-btn.active { border-color: var(--primary); color: var(--primary); background: var(--primary-light); }
.product-detail-card { background: #fff; border-radius: 12px; box-shadow: var(--shadow); margin-bottom: 20px; overflow: hidden; }
.card-header {
  padding: 20px 30px; display: flex; justify-content: space-between; align-items: center;
  cursor: pointer; background: var(--bg-light);
}
.card-header h3 { font-size: 18px; }
.card-content { padding: 30px; }
.card-inner { display: grid; grid-template-columns: 300px 1fr; gap: 30px; }
.card-inner img { width: 100%; height: 200px; object-fit: cover; border-radius: 8px; background: var(--bg-light); }
.card-inner .info { }
.card-inner .info p { color: var(--text-light); line-height: 1.8; margin-bottom: 10px; }
.card-inner .specs { margin-top: 15px; }
.card-inner .specs li { display: flex; justify-content: space-between; padding: 8px 0; border-bottom: 1px solid var(--border); font-size: 14px; }



/* ========== Logo Image ========== */
.site-logo .logo-img { height: 50px; width: auto; object-fit: contain; }

/* ========== Advantages Background ========== */
.advantages-section {
  background-size: cover; background-position: center; background-repeat: no-repeat;
  position: relative; color: #fff;
}
.advantages-section::before {
  content: ''; position: absolute; inset: 0;
  background: rgba(0,0,0,0.55); z-index: 0;
}
.advantages-section .container { position: relative; z-index: 1; }
.advantages-section .section-header h2 { color: #fff; }
.advantages-section .section-header p { color: rgba(255,255,255,0.85); }
.advantages-section .advantage-card { background: rgba(255,255,255,0.12); backdrop-filter: blur(6px); border: 1px solid rgba(255,255,255,0.15); }
.advantages-section .advantage-card h3 { color: #fff; }
.advantages-section .advantage-card p { color: rgba(255,255,255,0.85); }

/* ========== Products Page - 四级目录 ========== */
.products-page { padding: 40px 0 80px; background: var(--bg-light); }
.products-layout { display: grid; grid-template-columns: 260px 1fr; gap: 30px; align-items: start; }

/* 左侧栏 */
.products-sidebar {
  background: #fff; border-radius: 10px; box-shadow: var(--shadow);
  position: sticky; top: 90px; overflow: hidden;
}
.sidebar-title {
  padding: 18px 20px; font-size: 17px; font-weight: bold; color: #fff;
  background: var(--primary); letter-spacing: 1px;
}
.sidebar-title span { font-size: 13px; opacity: 0.8; margin-left: 8px; }

/* 树形菜单 */
.cat-tree { list-style: none; padding: 10px 0; margin: 0; max-height: 70vh; overflow-y: auto; }
.cat-tree ul { list-style: none; padding: 0; margin: 0; display: none; }
.cat-tree li.open > ul { display: block; }
.cat-tree li { position: relative; }
.cat-tree a {
  display: block; padding: 8px 16px 8px 20px; color: var(--text); font-size: 13px;
  text-decoration: none; border-left: 3px solid transparent; transition: 0.2s;
  line-height: 1.5;
}
.cat-tree a:hover { background: var(--primary-light); color: var(--primary); }
.cat-tree a.current { border-left-color: var(--primary); color: var(--primary); background: var(--primary-light); font-weight: 600; }

/* 层级缩进 */
.cat-l1 > a { padding-left: 16px; font-weight: 600; font-size: 14px; color: var(--secondary); border-bottom: 1px solid var(--border); }
.cat-l2 > li > a { padding-left: 32px; font-size: 13px; }
.cat-l3 > li > a { padding-left: 48px; font-size: 12px; color: var(--text-light); }

/* 展开/收起箭头 */
.tree-toggle {
  display: inline-block; width: 18px; height: 18px; position: absolute; right: 12px;
  top: 50%; transform: translateY(-50%); cursor: pointer; z-index: 2;
}
.tree-toggle::before {
  content: ''; display: block; width: 0; height: 0; margin: 6px auto;
  border-left: 5px solid var(--text-lighter); border-top: 4px solid transparent;
  border-bottom: 4px solid transparent; transition: 0.2s;
}
li.open > .tree-toggle::before {
  border-left: 5px solid var(--primary); transform: rotate(90deg);
}

/* 右侧内容区 */
.products-content { min-height: 600px; }
.cat-section {
  background: #fff; border-radius: 10px; box-shadow: var(--shadow);
  padding: 30px; margin-bottom: 24px; scroll-margin-top: 90px;
  transition: box-shadow 0.3s;
}
.cat-section.active { box-shadow: 0 0 0 2px var(--primary), var(--shadow); }
.cat-title {
  font-size: 22px; color: var(--secondary); margin-bottom: 8px;
  padding-bottom: 12px; border-bottom: 2px solid var(--primary); display: inline-block;
}
.cat-desc { color: var(--text-light); font-size: 14px; line-height: 1.8; margin-bottom: 24px; }

/* 产品分组 */
.cat-group { margin-bottom: 28px; }
.cat-group h3 {
  font-size: 16px; color: var(--primary-dark); margin-bottom: 16px;
  padding-left: 12px; border-left: 3px solid var(--primary);
}

/* 四列产品网格 */
.product-grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.product-tile {
  background: var(--bg-light); border-radius: 8px; overflow: hidden;
  transition: transform 0.3s, box-shadow 0.3s; border: 1px solid var(--border);
}
.product-tile:hover { transform: translateY(-3px); box-shadow: var(--shadow-hover); }
.tile-img { height: 140px; overflow: hidden; background: #fff; display: flex; align-items: center; justify-content: center; }
.tile-img img { max-width: 100%; max-height: 100%; object-fit: contain; padding: 10px; }
.product-tile h4 { font-size: 14px; padding: 10px 12px 4px; color: var(--secondary); }
.product-tile p { font-size: 12px; color: var(--text-light); padding: 0 12px 12px; line-height: 1.5; }

/* 暂无内容提示 */
.cat-empty {
  padding: 40px; text-align: center; color: var(--text-lighter); font-size: 14px;
  background: var(--bg-light); border-radius: 8px;
}
.cat-empty a { color: var(--primary); text-decoration: underline; }

/* 移动端侧边栏切换按钮 */
.sidebar-toggle-btn {
  display: none; padding: 10px 20px; background: var(--primary); color: #fff;
  border: none; border-radius: 6px; cursor: pointer; font-size: 14px;
  margin-bottom: 16px; width: 100%;
}

/* 移动端响应式 */
@media (max-width: 768px) {
  .sidebar-toggle-btn { display: block; }
  .products-layout { grid-template-columns: 1fr; }
  .products-sidebar {
    position: fixed; left: -280px; top: 0; bottom: 0; width: 270px;
    z-index: 1000; border-radius: 0; transition: left 0.3s;
    overflow-y: auto; max-height: none;
  }
  .products-sidebar.show { left: 0; }
  .product-grid-4 { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .cat-section { padding: 20px; }
}
@media (max-width: 480px) {
  .product-grid-4 { grid-template-columns: 1fr; }
}

/* ========== Secondhand Page (二手设备) ========== */
.equipment-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
.equipment-card {
  background: #fff; border-radius: 12px; overflow: hidden;
  box-shadow: var(--shadow); transition: var(--transition); position: relative;
}
.equipment-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-hover); }
.equipment-badge {
  position: absolute; top: 15px; left: 15px; z-index: 2;
  padding: 4px 12px; border-radius: 20px; font-size: 12px; font-weight: 600;
}
.badge-available { background: #e6f9ee; color: #2ecc71; }
.badge-reserved { background: #fff3e0; color: #f39800; }
.badge-sold { background: #f5f5f5; color: #999; }
.equipment-card-img {
  width: 100%; height: 200px; object-fit: cover;
}
.equipment-card-body { padding: 20px; }
.equipment-card-body h3 { font-size: 16px; margin-bottom: 10px; }
.equipment-card-body .meta { display: flex; gap: 15px; font-size: 13px; color: var(--text-lighter); margin-bottom: 10px; }
.equipment-card-body p { font-size: 14px; color: var(--text-light); line-height: 1.6; margin-bottom: 12px; }
.price { font-size: 20px; font-weight: 700; color: var(--primary); margin-bottom: 12px; }
.contact-btn {
  display: block; text-align: center; padding: 10px; background: var(--primary);
  color: #fff; border-radius: var(--radius); font-size: 14px; transition: 0.3s;
}
.contact-btn:hover { background: var(--primary-dark); color: #fff; }

/* ========== Strength (About) ========== */
.strength-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 30px; margin-top: 40px; }
.strength-card { padding: 30px; background: var(--bg-light); border-radius: 16px; }
.strength-card h4 { font-size: 18px; margin-bottom: 12px; }
.strength-card p { color: var(--text-light); line-height: 1.8; }

/* ========== About ========== */
.about-intro-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 50px; align-items: center; }
.about-intro-text h3 { font-size: 24px; margin-bottom: 16px; }
.about-intro-text p { color: var(--text-light); margin-bottom: 14px; line-height: 1.8; }
.about-stats { display: flex; justify-content: center; gap: 80px; margin-top: 60px; padding: 40px 0; background: var(--bg-light); border-radius: 16px; }
.about-stat { text-align: center; }
.about-stat .number { font-size: 42px; font-weight: 700; color: var(--primary); }
.about-stat .label { font-size: 14px; color: var(--text-light); margin-top: 4px; }

/* ========== Service Areas ========== */
.service-areas { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; margin-top: 30px; }
.service-area { text-align: center; padding: 30px 15px; background: #fff; border-radius: 12px; box-shadow: var(--shadow); transition: 0.3s; }
.service-area:hover { transform: translateY(-5px); box-shadow: var(--shadow-hover); }
.service-area .icon { font-size: 36px; margin-bottom: 10px; }
.service-area h4 { font-size: 15px; }

/* ========== Contact ========== */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 50px; }
.contact-info-list li { display: flex; gap: 15px; padding: 15px 0; border-bottom: 1px solid var(--border); }
.contact-info-list .icon { font-size: 24px; }
.contact-info-list .info-label { font-size: 13px; color: var(--text-light); margin-bottom: 2px; }
.contact-info-list .info-value { font-size: 15px; }
.contact-form input, .contact-form textarea {
  width: 100%; padding: 14px; border: 1px solid var(--border); border-radius: var(--radius);
  font-size: 15px; margin-bottom: 16px; font-family: inherit;
}
.contact-form input:focus, .contact-form textarea:focus { outline: none; border-color: var(--primary); }

/* ========== CTA ========== */
.cta-section { padding: 80px 0; background: linear-gradient(135deg, var(--primary), var(--primary-dark)); text-align: center; color: #fff; }
.cta-section h2 { color: #fff; margin-bottom: 12px; }
.cta-section p { opacity: 0.9; margin-bottom: 30px; }

/* ========== Buttons ========== */
.btn {
  display: inline-block; padding: 12px 36px; background: var(--primary); color: #fff;
  border: none; border-radius: var(--radius); font-size: 15px; cursor: pointer; transition: 0.3s;
}
.btn:hover { background: var(--primary-dark); color: #fff; }

/* ========== Footer ========== */
.site-footer { background: var(--secondary); color: #ccc; padding: 60px 0 0; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.footer-brand p { margin-top: 15px; font-size: 14px; line-height: 1.8; }
.footer-col h4 { color: #fff; margin-bottom: 16px; font-size: 16px; }
.footer-col ul li { margin-bottom: 8px; }
.footer-col a { color: #aaa; font-size: 14px; }
.footer-col a:hover { color: var(--primary); }
.footer-contact li { display: flex; gap: 10px; align-items: flex-start; }
.footer-contact .icon { font-size: 18px; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.1); padding: 20px 0; text-align: center; font-size: 13px; color: #888; }

/* ========== Floating Bar ========== */
.floating-bar {
  position: fixed; right: 20px; bottom: 50%; transform: translateY(50%);
  display: flex; flex-direction: column; gap: 10px; z-index: 999;
}
.floating-btn {
  width: 50px; height: 50px; border-radius: 50%; background: var(--primary);
  color: #fff; display: flex; align-items: center; justify-content: center;
  font-size: 20px; cursor: pointer; box-shadow: 0 2px 10px rgba(0,0,0,0.2); transition: 0.3s;
  position: relative; text-decoration: none;
}
.floating-btn:hover { transform: scale(1.1); color: #fff; }
.floating-btn .tooltip {
  position: absolute; right: 60px; white-space: nowrap; padding: 6px 12px;
  background: rgba(0,0,0,0.7); color: #fff; border-radius: 4px; font-size: 12px;
  opacity: 0; pointer-events: none; transition: 0.3s;
}
.floating-btn:hover .tooltip { opacity: 1; }
.back-to-top {
  position: fixed; right: 25px; bottom: 30px; width: 44px; height: 44px;
  background: var(--primary); color: #fff; border: none; border-radius: 50%;
  font-size: 20px; cursor: pointer; display: none; box-shadow: 0 2px 10px rgba(0,0,0,0.2);
}

/* ========== Animations ========== */
.fade-in { opacity: 0; transform: translateY(30px); transition: all 0.6s ease; }
.fade-in.visible { opacity: 1; transform: translateY(0); }
.fade-in-right { opacity: 0; transform: translateX(30px); transition: all 0.6s ease; }
.fade-in-right.visible { opacity: 1; transform: translateX(0); }
.reveal { opacity: 0; transform: translateY(30px); transition: all 0.6s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }

/* ========== Responsive ========== */
@media (max-width: 1024px) {
  .advantages-grid { grid-template-columns: repeat(2, 1fr); }
  .products-grid { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 768px) {
  .main-nav { display: none; }
  .main-nav.open { display: flex; flex-direction: column; position: absolute; top: var(--header-height); left: 0; right: 0; background: #fff; box-shadow: var(--shadow); padding: 20px; }
  .nav-toggle { display: block; }
  .hero-banner { height: 400px; }
  .hero-content h1 { font-size: 28px; }
  .hero-content p { font-size: 16px; }
  .advantages-grid { grid-template-columns: 1fr; }
  .products-grid { grid-template-columns: repeat(2, 1fr); }
  .secondhand-grid { grid-template-columns: 1fr; }
  .news-grid { grid-template-columns: 1fr; }
  .equipment-grid { grid-template-columns: 1fr; }
  .about-intro-grid { grid-template-columns: 1fr; }
  .about-stats { flex-direction: column; gap: 30px; }
  .strength-grid { grid-template-columns: 1fr; }
  .service-areas { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .card-inner { grid-template-columns: 1fr; }
}