/* ============================================
   Fiberwill - 像素级网格化设计
   8px 间距系统 + 12列网格 + 严格断点
   ============================================ */

/* === CSS 变量 === */
:root {
  /* 间距系统 8px 基准 */
  --s-1: 4px; --s-2: 8px; --s-3: 12px; --s-4: 16px;
  --s-5: 24px; --s-6: 32px; --s-7: 48px; --s-8: 64px; --s-9: 80px;

  /* 颜色 */
  --c-primary: #1e40af;
  --c-primary-dark: #1e3a8a;
  --c-primary-light: #eff6ff;
  --c-text: #1f2937;
  --c-text-sub: #6b7280;
  --c-bg: #ffffff;
  --c-bg-soft: #f9fafb;
  --c-border: #e5e7eb;
  --c-accent: #10b981;

  /* 圆角 */
  --r-sm: 6px; --r-md: 8px; --r-lg: 12px; --r-xl: 16px;

  /* 阴影 */
  --shadow-1: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-2: 0 4px 12px rgba(0,0,0,0.10);
  --shadow-3: 0 8px 24px rgba(0,0,0,0.12);

  /* 容器 */
  --container: 1200px;
  --header-h: 64px;
}

/* === Reset === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  font-size: 16px; line-height: 1.6; color: var(--c-text); background: var(--c-bg);
  min-height: 100vh; display: flex; flex-direction: column;
}
img { max-width: 100%; height: auto; display: block; }
img:not([src$=".svg"]) { image-rendering: -webkit-optimize-contrast; }
a { color: var(--c-primary); text-decoration: none; transition: color .2s; }
a:hover { color: var(--c-primary-dark); }
button { font-family: inherit; cursor: pointer; border: none; background: none; }

/* === 容器 === */
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--s-5);
  width: 100%;
}

/* === 12列网格 === */
.grid { display: grid; gap: var(--s-5); grid-template-columns: repeat(12, 1fr); }
.col-2 { grid-column: span 2; }
.col-3 { grid-column: span 3; }
.col-4 { grid-column: span 4; }
.col-6 { grid-column: span 6; }
.col-8 { grid-column: span 8; }
.col-12 { grid-column: span 12; }

/* === Header === */
.site-header {
  position: sticky; top: 0; z-index: 100;
  height: var(--header-h);
  background: rgba(255,255,255,0.96);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--c-border);
}
.header-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--s-5);
  height: 100%;
  display: flex; align-items: center; justify-content: space-between;
  gap: var(--s-5);
}
.logo { display: flex; align-items: center; min-height: 36px; }
.logo img { height: 36px !important; width: auto !important; max-width: 220px !important; display: block !important; }
.logo-icon img { height: 32px; width: 32px; object-fit: contain; }
.nav {
  display: flex; gap: var(--s-6); align-items: center; height: 100%;
}
.nav a {
  color: var(--c-text); font-weight: 500; font-size: 15px;
  height: 100%; display: flex; align-items: center;
  border-bottom: 2px solid transparent;
  transition: all .2s;
}
.nav a:hover, .nav a.active {
  color: var(--c-primary); border-bottom-color: var(--c-primary);
}

/* 汉堡菜单按钮 */
.menu-toggle {
  display: none; width: 40px; height: 40px;
  align-items: center; justify-content: center;
  font-size: 24px; color: var(--c-text);
}
.menu-toggle span {
  display: block; width: 22px; height: 2px; background: var(--c-text);
  position: relative;
}
.menu-toggle span::before, .menu-toggle span::after {
  content: ''; position: absolute; left: 0; width: 22px; height: 2px;
  background: var(--c-text);
}
.menu-toggle span::before { top: -7px; }
.menu-toggle span::after { top: 7px; }

/* === Footer === */
.site-footer {
  margin-top: auto;
  background: var(--c-primary-dark);
  color: rgba(255,255,255,0.85);
  padding: var(--s-8) 0 var(--s-4);
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: var(--s-7);
  margin-bottom: var(--s-7);
}
.footer-col h4 {
  color: #fff; font-size: 16px; font-weight: 600; margin-bottom: var(--s-4);
}
.footer-col ul { list-style: none; }
.footer-col ul li { margin-bottom: var(--s-2); }
.footer-col a { color: rgba(255,255,255,0.75); font-size: 14px; }
.footer-col a:hover { color: #fff; }
.footer-col p { font-size: 14px; line-height: 1.7; }
.footer-bottom {
  padding-top: var(--s-5);
  border-top: 1px solid rgba(255,255,255,0.15);
  text-align: center; font-size: 13px; color: rgba(255,255,255,0.6);
}

/* === Hero 区 === */
.hero {
  background: linear-gradient(135deg, var(--c-primary-light) 0%, #fff 100%);
  padding: var(--s-9) 0;
}
.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: var(--s-8);
  align-items: center;
}
.hero-text h1 {
  font-size: 44px; font-weight: 700; line-height: 1.15;
  color: var(--c-primary-dark); margin-bottom: var(--s-4);
}
.hero-text .subtitle {
  font-size: 20px; color: var(--c-text-sub); margin-bottom: var(--s-6);
  line-height: 1.5;
}
.hero-cta { display: flex; gap: var(--s-3); flex-wrap: wrap; }
.hero-image {
  border-radius: var(--r-xl);
  overflow: hidden;
  box-shadow: var(--shadow-3);
  aspect-ratio: 4/3;
  background: #fff;
}
.hero-image img {
  width: 100%; height: 100%; object-fit: contain; padding: var(--s-4);
}

/* === 小 Hero (子页面用) === */
.hero-sm {
  background: var(--c-primary-light);
  padding: var(--s-8) 0;
  text-align: center;
}
.hero-sm h1 {
  font-size: 40px; color: var(--c-primary-dark); margin-bottom: var(--s-3);
}
.hero-sm p { font-size: 18px; color: var(--c-text-sub); max-width: 720px; margin: 0 auto; }

/* === Section 通用 === */
.section { padding: var(--s-9) 0; }
.section-title {
  font-size: 32px; font-weight: 700; color: var(--c-primary-dark);
  text-align: center; margin-bottom: var(--s-3);
}
.section-subtitle {
  text-align: center; color: var(--c-text-sub); font-size: 17px;
  margin-bottom: var(--s-7); max-width: 720px; margin-left: auto; margin-right: auto;
}

/* === 按钮 === */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  height: 44px; padding: 0 var(--s-5);
  border-radius: var(--r-md); font-size: 15px; font-weight: 600;
  transition: all .2s; white-space: nowrap;
}
.btn-primary { background: var(--c-primary); color: #fff; }
.btn-primary:hover { background: var(--c-primary-dark); color: #fff; transform: translateY(-1px); box-shadow: var(--shadow-2); }
.btn-outline { background: transparent; color: var(--c-primary); border: 1.5px solid var(--c-primary); }
.btn-outline:hover { background: var(--c-primary); color: #fff; }
.btn-lg { height: 52px; padding: 0 var(--s-6); font-size: 16px; }

/* === 卡片 === */
.card {
  background: #fff; border-radius: var(--r-lg);
  padding: var(--s-6); box-shadow: var(--shadow-1);
  transition: all .25s; border: 1px solid var(--c-border);
  display: flex; flex-direction: column;
}
.card:hover { box-shadow: var(--shadow-2); transform: translateY(-2px); border-color: var(--c-primary-light); }
.card-icon {
  width: 48px; height: 48px; border-radius: var(--r-md);
  background: var(--c-primary-light);
  display: flex; align-items: center; justify-content: center;
  font-size: 24px; color: var(--c-primary); margin-bottom: var(--s-4);
}
.card h3 { font-size: 20px; color: var(--c-text); margin-bottom: var(--s-2); font-weight: 600; }
.card p { color: var(--c-text-sub); font-size: 15px; line-height: 1.6; flex-grow: 1; margin-bottom: var(--s-4); word-wrap: break-word; overflow-wrap: break-word; }
.card .btn { align-self: flex-start; }

/* === 数据条 === */
.stats-bar {
  background: var(--c-primary);
  padding: var(--s-7) 0;
  color: #fff;
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--s-5);
  text-align: center;
}
.stat-item h3 {
  font-size: 40px; font-weight: 700; color: #fff;
  margin-bottom: var(--s-2);
}
.stat-item p { font-size: 14px; color: rgba(255,255,255,0.85); text-transform: uppercase; letter-spacing: 1px; }

/* === 特性区 === */
.features-grid {
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: var(--s-5);
}
.feature-item {
  text-align: center; padding: var(--s-5);
}
.feature-icon {
  width: 56px; height: 56px; border-radius: 50%;
  background: var(--c-primary-light); color: var(--c-primary);
  display: flex; align-items: center; justify-content: center;
  font-size: 24px; margin: 0 auto var(--s-3);
}
.feature-item h4 { font-size: 17px; margin-bottom: var(--s-2); color: var(--c-text); }
.feature-item p { font-size: 14px; color: var(--c-text-sub); }

/* === 表格 === */
.spec-table {
  width: 100%; border-collapse: collapse; margin: var(--s-5) 0;
  background: #fff; border-radius: var(--r-lg); overflow: hidden;
  box-shadow: var(--shadow-1);
}
.spec-table th {
  background: var(--c-primary); color: #fff;
  padding: var(--s-3) var(--s-4); text-align: left; font-weight: 600; font-size: 14px;
}
.spec-table td {
  padding: var(--s-3) var(--s-4); border-bottom: 1px solid var(--c-border);
  font-size: 14px;
}
.spec-table tr:last-child td { border-bottom: none; }
.spec-table tr:hover td { background: var(--c-bg-soft); }

/* === 产品图集 === */
.gallery-section { margin-bottom: var(--s-8); }
.gallery-title {
  font-size: 22px; color: var(--c-primary-dark);
  margin-bottom: var(--s-4); padding-bottom: var(--s-2);
  border-bottom: 2px solid var(--c-primary-light);
}
.gallery-grid {
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: var(--s-3);
}
.gallery-item {
  aspect-ratio: 1; background: #fff; border-radius: var(--r-md);
  overflow: hidden; border: 1px solid var(--c-border);
  display: flex; align-items: center; justify-content: center;
}
.gallery-item img {
  width: 100%; height: 100%; object-fit: contain;
  padding: var(--s-3); transition: transform .3s;
}
.gallery-item:hover img { transform: scale(1.05); }

/* 3列图集变体 */
.gallery-grid-3 { grid-template-columns: repeat(3, 1fr); }

/* === CTA === */
.cta-block {
  background: linear-gradient(135deg, var(--c-primary) 0%, var(--c-primary-dark) 100%);
  color: #fff; padding: var(--s-8) var(--s-6);
  border-radius: var(--r-xl); text-align: center;
  margin: var(--s-8) 0;
}
.cta-block h2 { font-size: 32px; margin-bottom: var(--s-3); }
.cta-block p { font-size: 17px; opacity: 0.9; margin-bottom: var(--s-5); }
.cta-block .btn { background: #fff; color: var(--c-primary); }
.cta-block .btn:hover { background: var(--c-primary-light); }

/* === 联系页 === */
.contact-grid {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: var(--s-7);
}
.contact-info-list { list-style: none; }
.contact-info-list li {
  display: flex; gap: var(--s-4); padding: var(--s-4) 0;
  border-bottom: 1px solid var(--c-border);
}
.contact-info-list li:last-child { border-bottom: none; }
.contact-info-icon {
  width: 40px; height: 40px; flex-shrink: 0;
  background: var(--c-primary-light); color: var(--c-primary);
  border-radius: var(--r-md);
  display: flex; align-items: center; justify-content: center; font-size: 18px;
}
.contact-info-list strong { display: block; margin-bottom: 2px; color: var(--c-text); }
.contact-info-list span { color: var(--c-text-sub); font-size: 15px; }

/* === 面包屑 === */
.breadcrumb {
  padding: var(--s-4) 0; font-size: 14px; color: var(--c-text-sub);
}
.breadcrumb a { color: var(--c-text-sub); }
.breadcrumb a:hover { color: var(--c-primary); }
.breadcrumb span { margin: 0 var(--s-2); }

/* === 认证徽章 === */
.cert-bar {
  display: flex; justify-content: center; align-items: center;
  gap: var(--s-7); flex-wrap: wrap; padding: var(--s-6) 0;
}
.cert-badge {
  background: #fff; border: 1px solid var(--c-border);
  border-radius: var(--r-md); padding: var(--s-3) var(--s-5);
  font-weight: 600; color: var(--c-primary-dark);
  font-size: 14px; letter-spacing: 1px;
  box-shadow: var(--shadow-1);
}

/* === 主推产品特写 === */
.featured-product {
  background: var(--c-bg-soft);
  padding: var(--s-9) 0;
}
.featured-grid {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: var(--s-8); align-items: center;
}
.featured-img {
  aspect-ratio: 4/3; background: #fff;
  border-radius: var(--r-xl); overflow: hidden;
  box-shadow: var(--shadow-2);
  display: flex; align-items: center; justify-content: center;
}
.featured-img img { width: 100%; height: 100%; object-fit: contain; padding: var(--s-5); }
.featured-text h2 {
  font-size: 32px; color: var(--c-primary-dark); margin-bottom: var(--s-4);
}
.featured-text ul {
  list-style: none; margin: var(--s-5) 0;
}
.featured-text ul li {
  padding: var(--s-2) 0; padding-left: var(--s-5);
  position: relative; color: var(--c-text);
}
.featured-text ul li::before {
  content: '✓'; position: absolute; left: 0;
  color: var(--c-accent); font-weight: 700;
}

/* =================== 自响应 =================== */
/* 平板 ≤1024px */
@media (max-width: 1024px) {
  .hero-text h1 { font-size: 38px; }
  .hero-sm h1 { font-size: 32px; }
  .section-title { font-size: 28px; }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: var(--s-6); }
  .stat-item h3 { font-size: 32px; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: var(--s-5); }
  .gallery-grid { grid-template-columns: repeat(3, 1fr); }
}

/* 手机 ≤768px */
@media (max-width: 768px) {
  :root { --header-h: 56px; }

  /* 导航变汉堡 */
  .menu-toggle { display: flex; }
  .nav {
    position: fixed; top: var(--header-h); left: 0; right: 0;
    background: #fff; flex-direction: column;
    height: auto; padding: var(--s-4);
    box-shadow: var(--shadow-2);
    transform: translateY(-120%); transition: transform .3s;
    gap: 0; border-top: 1px solid var(--c-border);
  }
  .nav.open { transform: translateY(0); }
  .nav a {
    width: 100%; height: 48px; padding: 0 var(--s-3);
    border-bottom: 1px solid var(--c-border);
  }
  .nav a:last-child { border-bottom: none; }

  /* 容器内边距减小 */
  .container { padding: 0 var(--s-4); }

  /* Hero */
  .hero { padding: var(--s-6) 0; }
  .hero-grid, .featured-grid, .contact-grid {
    grid-template-columns: 1fr; gap: var(--s-5);
  }
  .hero-text h1 { font-size: 30px; }
  .hero-text .subtitle { font-size: 16px; }
  .hero-sm { padding: var(--s-6) 0; }
  .hero-sm h1 { font-size: 26px; }
  .hero-sm p { font-size: 15px; }
  .hero-image { aspect-ratio: 16/10; }

  /* Section */
  .section { padding: var(--s-7) 0; }
  .section-title { font-size: 24px; }
  .section-subtitle { font-size: 15px; margin-bottom: var(--s-5); }

  /* 网格全部变1列 */
  .features-grid, .stats-grid { grid-template-columns: 1fr 1fr; }
  .stat-item h3 { font-size: 28px; }
  .card { padding: var(--s-5); }

  /* 产品分类卡 (4列→2列) */
  .grid .col-3, .grid .col-4 { grid-column: span 6; }

  /* Footer */
  .footer-grid { grid-template-columns: 1fr; gap: var(--s-5); text-align: center; }
  .footer-col ul li { margin-bottom: var(--s-2); }

  /* 表格变卡片式 (横向滚动) */
  .spec-table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; }
  .spec-table { min-width: 600px; }

  /* 图集变3列→2列 */
  .gallery-grid, .gallery-grid-3 { grid-template-columns: repeat(2, 1fr); gap: var(--s-2); }

  /* CTA */
  .cta-block { padding: var(--s-6) var(--s-4); }
  .cta-block h2 { font-size: 24px; }
  .cta-block p { font-size: 15px; }

  /* 认证徽章 */
  .cert-bar { gap: var(--s-3); padding: var(--s-4) 0; }
  .cert-badge { padding: var(--s-2) var(--s-4); font-size: 13px; }

  /* 特写 */
  .featured-product { padding: var(--s-7) 0; }
  .featured-text h2 { font-size: 24px; }
}

/* 小手机 ≤480px */
@media (max-width: 480px) {
  .hero-text h1 { font-size: 26px; }
  .features-grid, .stats-grid { grid-template-columns: 1fr; }
  .gallery-grid, .gallery-grid-3 { grid-template-columns: 1fr 1fr; }
  .hero-cta { flex-direction: column; }
  .hero-cta .btn { width: 100%; }
}


/* === 产品详情 - 左右双栏版式 === */
.model-section {
  background: #fff;
  border-radius: var(--r-xl);
  margin-bottom: var(--s-8);
  overflow: hidden;
  box-shadow: var(--shadow-2);
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  min-height: 420px;
}
.model-images {
  background: var(--c-bg-soft);
  padding: var(--s-5);
  display: flex;
  flex-direction: column;
  gap: var(--s-3);
  justify-content: center;
}
.model-image-main {
  aspect-ratio: 4/3;
  background: #fff;
  border-radius: var(--r-md);
  overflow: hidden;
  display: flex; align-items: center; justify-content: center;
  border: 1px solid var(--c-border);
}
.model-image-main img {
  width: 100%; height: 100%; object-fit: contain; padding: var(--s-3);
}
.model-image-thumbs {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--s-2);
}
.model-image-thumbs .thumb {
  aspect-ratio: 1;
  background: #fff;
  border-radius: var(--r-sm);
  overflow: hidden;
  border: 1px solid var(--c-border);
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
  transition: border-color .2s;
}
.model-image-thumbs .thumb:hover { border-color: var(--c-primary); }
.model-image-thumbs .thumb img {
  width: 100%; height: 100%; object-fit: contain; padding: 4px;
}
.model-info {
  padding: var(--s-7);
  display: flex; flex-direction: column; justify-content: center;
  position: relative;
}
/* 深蓝色块变体 */
.model-info.dark {
  background: linear-gradient(135deg, var(--c-primary-dark) 0%, var(--c-primary) 100%);
  color: #fff;
}
.model-info.dark .model-tag {
  background: rgba(255,255,255,0.2); color: #fff;
}
.model-info.dark .model-feature { color: rgba(255,255,255,0.9); }
.model-info.dark .model-feature::before { color: var(--c-accent); }
/* 浅蓝色块变体 */
.model-info.light {
  background: var(--c-primary-light);
  color: var(--c-text);
}
.model-info.light .model-tag {
  background: var(--c-primary); color: #fff;
}

.model-tag {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: var(--s-3);
  align-self: flex-start;
}
.model-info h3 {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: var(--s-2);
  line-height: 1.2;
}
.model-info .model-subtitle {
  font-size: 15px;
  opacity: 0.85;
  margin-bottom: var(--s-5);
}
.model-features {
  list-style: none;
  margin: var(--s-4) 0 var(--s-5);
}
.model-feature {
  padding: 8px 0 8px 28px;
  position: relative;
  font-size: 15px;
  line-height: 1.5;
}
.model-feature::before {
  content: '✓';
  position: absolute;
  left: 0; top: 8px;
  font-weight: 700;
  color: var(--c-accent);
}
.model-info .btn {
  align-self: flex-start;
  margin-top: var(--s-3);
}
.model-info.light .btn-primary {
  background: var(--c-primary);
}
.model-info.dark .btn-primary {
  background: #fff;
  color: var(--c-primary-dark);
}
.model-info.dark .btn-primary:hover {
  background: var(--c-primary-light);
  color: var(--c-primary-dark);
}

/* 手机端: 左右变上下 */
@media (max-width: 768px) {
  .model-section {
    grid-template-columns: 1fr;
    min-height: auto;
  }
  .model-info { padding: var(--s-5); }
  .model-info h3 { font-size: 24px; }
}


/* === 认证证书区 (新版: 真实图片) === */
.cert-grid {
  display: grid !important;
  grid-template-columns: repeat(4, 1fr) !important;
  gap: var(--s-5) !important;
  max-width: 900px !important;
  margin: 0 auto !important;
}
.cert-item {
  display: flex; flex-direction: column; align-items: center;
  text-decoration: none; padding: var(--s-3);
  border-radius: var(--r-md);
  background: #fff;
  border: 1px solid var(--c-border);
  transition: all .25s;
  box-shadow: var(--shadow-1);
}
.cert-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-3);
  border-color: var(--c-primary);
}
.cert-item img {
  width: 100% !important;
  max-width: 180px !important;
  height: 240px !important;
  object-fit: contain !important;
  background: var(--c-bg-soft) !important;
  border-radius: var(--r-sm) !important;
  margin-bottom: var(--s-3) !important;
}
.cert-item p {
  font-weight: 700;
  color: var(--c-primary-dark);
  font-size: 16px;
  letter-spacing: 1px;
  margin: 0;
}

@media (max-width: 768px) {
  .cert-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--s-3);
  }
  .cert-item img {
    height: 180px;
    max-width: 140px;
  }
  .cert-item p { font-size: 14px; }
}

/* === About 页面：公司介绍文字折叠（默认跟图同高） === */
.about-intro {
  align-items: flex-start;
}
.about-text {
  position: relative;
  max-height: 360px; /* 初始值，JS 加载后会覆盖成跟图一致 */
  overflow: hidden;
  transition: max-height 0.35s ease;
  padding-right: var(--s-3);
}
.about-text.expanded {
  max-height: 2000px;
}
/* 折叠时底部渐变提示"还有内容" */
.about-text:not(.expanded)::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 56px;
  background: linear-gradient(to bottom, rgba(255,255,255,0) 0%, rgba(255,255,255,0.95) 80%, #ffffff 100%);
  pointer-events: none;
}
.about-h2 {
  color: var(--c-primary-dark);
  font-size: 24px;
  line-height: 1.35;
  margin-bottom: var(--s-4);
}
.about-text p {
  color: var(--c-text-sub);
  font-size: 15px;
  line-height: 1.8;
  margin-bottom: var(--s-3);
}
.about-text p:last-child { margin-bottom: 0; }
.about-toggle {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: var(--s-3);
  padding: 6px 14px;
  background: var(--c-primary-light);
  color: var(--c-primary-dark);
  font-size: 14px;
  font-weight: 600;
  border-radius: var(--r-md);
  transition: background 0.2s;
}
.about-toggle:hover { background: #dbeafe; }
.about-toggle .toggle-icon {
  font-size: 12px;
  transition: transform 0.25s;
}
.about-toggle[aria-expanded="true"] .toggle-icon { transform: rotate(0deg); }
.about-hero-image {
  position: sticky;
  top: calc(var(--header-h) + 16px);
}

/* 移动端：单列时图变高，文字折叠更明显 */
@media (max-width: 768px) {
  .about-text { max-height: 320px; padding-right: 0; }
  .about-h2 { font-size: 20px; }
  .about-text p { font-size: 14px; }
  .about-hero-image { position: static; aspect-ratio: 1 / 1; max-height: 360px; }
  .about-hero-image img { max-height: 360px; }
}

@media (min-width: 769px) and (max-width: 1024px) {
  .about-text { max-height: 420px; }
}


/* === Product Range 4卡严格等宽（像素级网格） === */
.product-range-grid {
  display: grid !important;
  grid-template-columns: repeat(4, minmax(0, 1fr)) !important;
  gap: var(--s-5) !important;
}
.product-range-grid > .col-3 {
  grid-column: auto !important;  /* 覆盖默认 12 列系统的 span 3 */
  width: 100%;
  min-width: 0;  /* 防 flex/grid item 被内容撑大 */
}
.product-range-grid .card {
  width: 100%;
  height: 100%;
  box-sizing: border-box;
}

/* 平板 769-1024px：仍 4 列，但间距收紧 */
@media (min-width: 769px) and (max-width: 1024px) {
  .product-range-grid { gap: var(--s-4) !important; }
  .product-range-grid .card { padding: var(--s-5); }
  .product-range-grid .card h3 { font-size: 18px; }
  .product-range-grid .card p { font-size: 14px; }
}

/* 手机 ≤768px：变 2 列（之前 col-3 span 6 也是 2 列，保持） */
@media (max-width: 768px) {
  .product-range-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr)) !important;
    gap: var(--s-4) !important;
  }
}

/* 小手机 ≤480px：变 1 列 */
@media (max-width: 480px) {
  .product-range-grid {
    grid-template-columns: 1fr !important;
  }
}


/* === About 页面：手机端强制单列（防 col-6 同行撑破） === */
@media (max-width: 768px) {
  .about-intro {
    grid-template-columns: 1fr !important;
    gap: var(--s-5) !important;
  }
  .about-intro .col-6 {
    grid-column: span 1 !important;
    width: 100% !important;
    min-width: 0 !important;
  }
  /* 顺序：文字先（图后） */
  .about-intro .col-6:first-child { order: 1; }
  .about-intro .col-6:last-child  { order: 2; }
  /* 图片 1:1 自适应 */
  .about-hero-image {
    position: static !important;
    aspect-ratio: 1 / 1;
    max-width: 100%;
    width: 100%;
  }
  .about-hero-image img {
    width: 100%;
    height: 100%;
    max-height: 360px;
    object-fit: contain;
  }
  /* 文字折叠：图在下时，文字 max-height 不要被图影响，用固定 320px */
  .about-text { max-height: 320px !important; padding-right: 0 !important; }
}


/* === About Hero 副标题手机端溢出修复 === */
@media (max-width: 768px) {
  .hero-sm p {
    max-width: 100% !important;
    padding: 0 var(--s-3);
    word-wrap: break-word;
    overflow-wrap: break-word;
  }
  .hero-sm h1 {
    word-wrap: break-word;
    overflow-wrap: break-word;
  }
}


/* === Hero 副标题 + H1 强防溢出（覆盖 max-width: 720px） === */
@media (max-width: 768px) {
  .hero-sm {
    padding: var(--s-6) var(--s-3) !important;  /* 减小上下 padding, 加左右 padding */
  }
  .hero-sm h1, .hero-sm p {
    max-width: 100% !important;
    width: 100% !important;
    padding: 0 var(--s-2) !important;
    word-break: break-word !important;
    overflow-wrap: break-word !important;
    white-space: normal !important;
    box-sizing: border-box !important;
  }
  .hero-sm h1 { font-size: 24px !important; }
  .hero-sm p { font-size: 14px !important; }
}


/* === 数据条 mobile 极致压缩（防数字溢出） === */
@media (max-width: 768px) {
  .stats-bar { padding: var(--s-5) 0 !important; }
  .stats-grid {
    grid-template-columns: 1fr 1fr !important;
    gap: var(--s-4) !important;
    padding: 0 var(--s-3) !important;
  }
  .stat-item {
    padding: 0 !important;
    min-width: 0 !important;
    overflow: hidden !important;
  }
  .stat-item h3 {
    font-size: 24px !important;
    line-height: 1.1 !important;
    margin-bottom: 2px !important;
    word-break: break-word !important;
  }
  .stat-item p {
    font-size: 12px !important;
    line-height: 1.2 !important;
    word-break: break-word !important;
  }
}


/* === 全局防横向溢出（兜底） === */
html, body {
  overflow-x: hidden !important;
  max-width: 100vw !important;
}
img {
  max-width: 100% !important;
  height: auto !important;
}
/* 数据条：再次缩小字体 + 强制 wrap */
@media (max-width: 768px) {
  .stats-bar { padding: var(--s-4) 0 !important; }
  .stats-grid {
    grid-template-columns: 1fr 1fr !important;
    gap: var(--s-3) !important;
    padding: 0 var(--s-2) !important;
    max-width: 100% !important;
  }
  .stat-item h3 {
    font-size: 22px !important;
    line-height: 1.1 !important;
  }
  .stat-item p {
    font-size: 11px !important;
    line-height: 1.2 !important;
    letter-spacing: 0.5px !important;
  }
  /* 优势 4 列 → 2 列已经对了，再小点 */
  .features-grid {
    grid-template-columns: 1fr 1fr !important;
    gap: var(--s-3) !important;
    padding: 0 var(--s-2) !important;
  }
  .feature-item {
    padding: var(--s-4) !important;
  }
  .feature-item h4 { font-size: 14px !important; }
  .feature-item p { font-size: 12px !important; }
}


/* === 终极防溢出 === */
* { max-width: 100% !important; }
body, html { overflow-x: hidden !important; width: 100% !important; }
img { max-width: 100% !important; }
section, .container, .grid, .col-6, .col-3, .col-4 { 
  max-width: 100% !important; 
  overflow: hidden !important;
}
/* 但有些需要可见的不能 hidden - 比如 .cert-grid 图片需要完整 */
.cert-grid { overflow: visible !important; }
.feature-item { overflow: visible !important; }
.stat-item { overflow: visible !important; }


/* 优势同样修复 */
.features-grid {
  display: grid !important;
  grid-template-columns: repeat(2, minmax(0, 1fr)) !important;
  gap: var(--s-3) !important;
  padding: 0 var(--s-2) !important;
  width: 100% !important;
  max-width: 100% !important;
  box-sizing: border-box !important;
}
.feature-item {
  min-width: 0 !important;
  max-width: 100% !important;
  overflow: hidden !important;
  word-break: break-all !important;
  box-sizing: border-box !important;
}

/* === 终极修复：每个 grid 容器都 min-width: 0 === */
.container, .stats-bar, .stats-grid, .features-grid, .cert-grid,
.hero-grid, .about-intro, .featured-grid, .contact-grid, .gallery-grid {
  min-width: 0 !important;
  max-width: 100% !important;
  width: 100% !important;
  box-sizing: border-box !important;
}
.stats-bar .container, .features-section .container, .cert-section .container {
  max-width: 100% !important;
  padding: 0 var(--s-3) !important;
}
/* 防止 body 撑出 viewport */
body, html {
  max-width: 100vw !important;
  overflow-x: hidden !important;
}
/* 兜底：所有 section */
section {
  max-width: 100vw !important;
  overflow-x: hidden !important;
}


/* === V11 移动端 stats 强制 2x2 === */
@media (max-width: 768px) {
  .stats-grid {
    display: grid !important;
    grid-template-columns: 1fr 1fr !important;
    grid-template-rows: auto auto !important;
    gap: 8px !important;
    width: 100% !important;
    max-width: 100% !important;
  }
  .stat-item {
    width: 100% !important;
    max-width: 100% !important;
    min-width: 0 !important;
    box-sizing: border-box !important;
    padding: 16px 8px !important;
    text-align: center !important;
  }
  .stat-number { font-size: 28px !important; line-height: 1.1 !important; }
  .stat-label { font-size: 12px !important; }
  /* 关键：强制 body 不被任何子元素撑开 */
  body, html {
    max-width: 100% !important;
    overflow-x: clip !important;
    width: 100% !important;
  }
}


/* === V13 桌面端证书 4 列横排 === */
@media (min-width: 769px) {
  .cert-grid {
    display: grid !important;
    grid-template-columns: repeat(4, minmax(0, 1fr)) !important;
    gap: var(--s-5) !important;
    max-width: 1000px !important;
    margin: 0 auto !important;
  }
  .cert-item img {
    width: 100% !important;
    max-width: 160px !important;
    height: 220px !important;
    object-fit: contain !important;
  }
}


/* === V16 移动端证书 2x2（强制修复） === */
@media (max-width: 768px) {
  .cert-grid {
    grid-template-columns: repeat(2, 1fr) !important;
    gap: var(--s-3) !important;
    max-width: 100% !important;
    padding: 0 var(--s-3) !important;
  }
  .cert-item {
    width: 100% !important;
    max-width: 100% !important;
  }
  .cert-item img {
    width: 100% !important;
    max-width: 100% !important;
    height: 200px !important;
    object-fit: contain !important;
  }
}