/* Navigation */
.nav { position: fixed; top: 0; left: 0; right: 0; z-index: 1000; background: rgba(255,255,255,0.85); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); border-bottom: none; transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1); }
.nav.scrolled { background: rgba(255,255,255,0.95); box-shadow: 0 1px 3px rgba(0,0,0,0.06); }
.nav-inner { display: flex; align-items: center; justify-content: space-between; padding: 16px 24px; max-width: 1200px; margin: 0 auto; }
.logo { font-size: 1.25rem; font-weight: 800; color: var(--blue-primary); display: flex; align-items: center; gap: 10px; }
.logo span { font-weight: 500; font-size: 0.85rem; color: var(--gray-500); }



.nav-links { display: flex; gap: 32px; align-items: center; }
.nav-links a { font-size: 0.95rem; font-weight: 500; color: var(--gray-700); position: relative; outline: none !important; }
.nav-links a:hover, .nav-links a.active { color: var(--blue-primary); }
.nav-links a::after { content: ''; position: absolute; bottom: -4px; left: 0; width: 0; height: 2px; background: var(--blue-primary); transition: width 0.3s; }
.nav-links a:hover::after, .nav-links a.active::after { width: 100%; }
.nav-link { padding: 10px 24px; border-radius: 50px; color: var(--blue-primary); font-weight: 600; position: relative; outline: none !important; }
.nav-link:hover { color: var(--blue-primary); }
.nav-link::after { content: ''; position: absolute; bottom: -4px; left: 0; width: 0; height: 2px; background: var(--blue-primary); transition: width 0.3s; }
.nav-link:hover::after { width: 100%; }

.nav-toggle { display: none; background: none; border: none; cursor: pointer; }
.nav-links { display: flex; gap: 32px; align-items: center; }
.nav-links a { font-size: 0.95rem; font-weight: 500; color: var(--gray-700); position: relative; outline: none !important; }
.nav-links a:hover, .nav-links a.active { color: var(--blue-primary); }
.nav-links a::after { content: ''; position: absolute; bottom: -4px; left: 0; width: 0; height: 2px; background: var(--blue-primary); transition: width 0.3s; }
.nav-links a:hover::after, .nav-links a.active::after { width: 100%; }
.nav-link { padding: 10px 24px; border-radius: 50px; color: var(--blue-primary); font-weight: 600; position: relative; outline: none !important; }
.nav-link:hover { color: var(--blue-primary); }
.nav-link::after { content: ''; position: absolute; bottom: -4px; left: 0; width: 0; height: 2px; background: var(--blue-primary); transition: width 0.3s; }
.nav-link:hover::after { width: 100%; }

.nav-toggle svg { width: 24px; height: 24px; }

a:focus { outline: none !important; }
:root {
  --white: #FFFFFF;
  --gray-50: #F8FAFC;
  --gray-100: #F1F5F9;
  --gray-200: #E2E8F0;
  --gray-300: #CBD5E1;
  --gray-500: #64748B;
  --gray-700: #334155;
  --gray-900: #0F172A;
  --blue-primary: #0066FF;
  --blue-light: #3388FF;
  --cyan-accent: #00D4FF;
  --gold: #D4AF37;
  --gold-light: #E8C547;
  --purple: #8B5CF6;
  --green: #10B981;
  --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.1);
  --shadow-xl: 0 12px 32px rgba(0,0,0,0.12);
  --radius: 12px;
  --radius-lg: 16px;
  --radius-btn: 50px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; font-size: 16px; }
body { font-family: var(--font-sans); color: var(--gray-900); background: #F8FAFC; line-height: 1.7; -webkit-font-smoothing: antialiased; }
a { text-decoration: none; color: inherit; transition: var(--transition); }
ul { list-style: none; } img { max-width: 100%; display: block; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.section { padding: 100px 0; }
.section-title { font-size: 2.25rem; font-weight: 800; margin-bottom: 12px; letter-spacing: -0.02em; }
.section-subtitle { font-size: 1.05rem; color: var(--gray-500); margin-bottom: 56px; line-height: 1.6; }
.section-header { text-align: center; }

/* Buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; padding: 14px 36px; border-radius: var(--radius-btn); font-size: 0.95rem; font-weight: 600; cursor: pointer; transition: var(--transition); border: none; }
.btn-primary { background: var(--blue-primary); color: var(--white); }
.btn-primary:hover { background: var(--blue-light); transform: translateY(-2px); box-shadow: 0 8px 20px rgba(0,102,255,0.3); }
.btn-gold { background: linear-gradient(135deg, var(--gold), var(--gold-light)); color: var(--white); }
.btn-gold:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(212,175,55,0.35); }

.page-hero {
  background: 
    radial-gradient(circle at 85% 15%, rgba(0,102,255,0.05) 0%, transparent 35%),
    radial-gradient(circle at 15% 85%, rgba(0,212,255,0.04) 0%, transparent 35%),
    linear-gradient(180deg, #EDF5FF 0%, #F5FAFF 50%, #FFFFFF 100%);
  padding: 160px 0 120px;
  color: #0F172A;
  position: relative;
  overflow: hidden;
}

/* 全背景极淡网格点阵 */
.page-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle, rgba(30,60,120,0.25) 1.5px, transparent 1.5px);
  background-size: 32px 32px;
  opacity: 1.0;
  pointer-events: none;
}

/* 右下角大光晕 */
.page-hero::after {
  content: '';
  position: absolute;
  right: -150px;
  bottom: -100px;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(0,80,200,0.15) 0%, transparent 65%);
  pointer-events: none;
}

.page-hero-inner {
  position: relative;
  z-index: 1;
  max-width: 700px;
}

.page-hero-label {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  color: #0066FF;
  letter-spacing: 0.15em;
  margin-bottom: 16px;
  text-transform: uppercase;
}

.page-hero h1 {
  font-size: 3rem;
  font-weight: 800;
  margin-bottom: 20px;
  line-height: 1.2;
}

.page-hero-line {
  width: 48px;
  height: 4px;
  background: linear-gradient(90deg, #D4AF37, #F59E0B);
  border-radius: 2px;
  margin-bottom: 20px;
}

.page-hero p {
  font-size: 1.1rem;
  color: #64748B;
  line-height: 1.7;
  max-width: 560px;
}

.page-hero-wave {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 80px;
  z-index: 1;
}

@media (max-width: 768px) {
  .page-hero { padding: 120px 0 80px; }
  .page-hero h1 { font-size: 2.2rem; }
  .page-hero-wave { height: 50px; }
}

.page-hero-network {
  position: absolute;
  right: 8%;
  top: 50%;
  transform: translateY(-50%);
  width: 400px;
  height: 360px;
  z-index: 0;
  pointer-events: none;
  opacity: 0.12;
}

/* 变电站/配电室现场线框图 */
.page-hero-site {
  position: absolute;
  right: 8%;
  top: 50%;
  transform: translateY(-50%);
  width: 400px;
  height: 360px;
  z-index: 0;
  pointer-events: none;
  opacity: 0.12;
}

@media (max-width: 1024px) {
  .page-hero-site {
    width: 300px;
    height: 270px;
    right: 2%;
    opacity: 0.8;
  }
  .page-hero-network { display: none; }
}

@media (max-width: 768px) {
  .page-hero-site { display: none; }
}

/* Category Filter */
.filter-tabs { display: flex; justify-content: center; gap: 12px; margin-bottom: 48px; flex-wrap: wrap; }
.filter-tab { padding: 10px 28px; border-radius: var(--radius-btn); font-size: 0.9rem; font-weight: 500; cursor: pointer; transition: var(--transition); border: 1px solid var(--gray-200); background: var(--white); color: var(--gray-700); }
.filter-tab:hover, .filter-tab.active { background: var(--blue-primary); color: var(--white); border-color: var(--blue-primary); }

/* Case Cards */
.cases-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
/* Case Cards - 项目铭牌风格 */
/* 统一白色背景 */
.case-card {
  background: #F8FAFC;
  color: var(--gray-900);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  overflow: hidden;
  cursor: pointer;
  transition: var(--transition);
  position: relative;
  display: flex;
  flex-direction: column;
  text-decoration: none;
}
.case-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(0, 102, 255, 0.3);
}

/* 行业顶部色条 - 4px 高 */
.case-card[data-industry="电力"]::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: #2563EB;
  z-index: 1;
}
.case-card[data-industry="通信"]::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: #0891B2;
  z-index: 1;
}
.case-card[data-industry="冶金"]::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: #D97706;
  z-index: 1;
}
.case-card[data-industry="能源"]::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: #059669;
  z-index: 1;
}
.case-card[data-industry="轨道交通"]::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: #7C3AED;
  z-index: 1;
}

/* 客户名称 - 品牌蓝色 pill 标签 */
.case-client {
  display: inline-block;
  margin: 16px 24px 0 24px;
  padding: 4px 12px;
  background: rgba(0, 102, 255, 0.08);
  border: 1px solid rgba(0, 102, 255, 0.2);
  border-radius: 50px;
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--blue-primary);
  letter-spacing: 0.05em;
  text-align: center;
}

/* 项目名称 - 中间放大居中 */
.case-project {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 24px;
}
.case-project h3 {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--gray-900);
  line-height: 1.3;
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}
.case-project .case-divider {
  width: 48px;
  height: 1px;
  background: var(--gray-300);
  margin: 16px 0;
}
.case-project .case-desc {
  font-size: 0.85rem;
  color: var(--gray-500);
  line-height: 1.6;
}

/* 产品标签 */
.case-products {
  padding: 16px 24px;
  border-top: 1px solid var(--gray-100);
  font-size: 0.8rem;
  color: var(--gray-700);
  text-align: center;
}

/* 查看详情 */
.case-action {
  display: block;
  text-align: center;
  padding: 16px 24px 20px 24px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--blue-primary);
  opacity: 0.7;
  transition: var(--transition);
  letter-spacing: 0.05em;
}
.case-card:hover .case-action {
  opacity: 1;
}

/* Stats */
.cases-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-top: 48px;
  padding: 56px 0;
  background: var(--gray-900);
  border-radius: var(--radius-lg);
  text-align: center;
  position: relative;
  overflow: hidden;
}
.cases-stats::before {
  content: '';
  position: absolute;
  inset: 0;
  background: 
    radial-gradient(circle at 20% 50%, rgba(212, 175, 55, 0.05) 0%, transparent 40%),
    radial-gradient(circle at 80% 50%, rgba(0, 102, 255, 0.05) 0%, transparent 40%);
  pointer-events: none;
}
.case-stat {
  text-align: center;
  position: relative;
  z-index: 1;
}
.case-stat:not(:last-child)::after {
  content: '';
  position: absolute;
  right: 0;
  top: 20%;
  height: 60%;
  width: 1px;
  background: rgba(255, 255, 255, 0.1);
}
.case-stat-number {
  font-size: 2.75rem;
  font-weight: 800;
  color: var(--gold);
  margin-bottom: 8px;
  line-height: 1.2;
  display: inline-block;
  background: linear-gradient(135deg, var(--gold), var(--gold-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.case-stat-label {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.6);
  font-weight: 500;
  letter-spacing: 0.05em;
}

/* Footer */
.footer { background: var(--gray-900); color: var(--gray-300); padding: 60px 0 30px; border-top: 1px solid #E2E8F0; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 48px; margin-bottom: 48px; }
.footer h4 { color: var(--white); font-size: 1rem; font-weight: 700; margin-bottom: 20px; }
.footer p, .footer li { font-size: 0.9rem; line-height: 1.8; margin-bottom: 8px; }
.footer a:hover { color: var(--white); }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.1); padding-top: 24px; text-align: center; font-size: 0.85rem; }

/* Fade-in */
.fade-in { opacity: 0; transform: translateY(24px); transition: opacity 0.7s ease, transform 0.7s cubic-bezier(0.4, 0, 0.2, 1); }
.fade-in.visible { opacity: 1; transform: translateY(0); }

@media (max-width: 1024px) {
  .cases-grid { grid-template-columns: repeat(2, 1fr); }
  .cases-stats { grid-template-columns: repeat(2, 1fr); padding: 40px 24px; }
  .case-stat-number { font-size: 2.25rem; }
  .case-stat:not(:last-child)::after { display: none; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  .nav { display: none !important; }
  .mobile-toggle { display: flex; }
  .cases-grid { grid-template-columns: 1fr; }
  .cases-stats { grid-template-columns: repeat(2, 1fr); padding: 32px 16px; gap: 32px; }
  .case-stat-number { font-size: 2rem; }
  .case-stat:not(:last-child)::after { display: none; }
  .footer-grid { grid-template-columns: 1fr; }
  .page-hero h1 { font-size: 2rem; }
  .section { padding: 64px 0; }
}
/* 移除所有元素的 focus outline */
*, *::before, *::after { outline: none !important; }
a:focus, a:focus:hover, a:active, a:focus-visible { outline: none !important; }
h4:focus, h4:focus:hover, h4:active { outline: none !important; }
span:focus, span:focus:hover, span:active { outline: none !important; }
div:focus, div:focus:hover, div:active { outline: none !important; }
button:focus, button:focus:hover, button:active { outline: none !important; }
[tabindex]:focus { outline: none !important; }
input:focus, textarea:focus, select:focus { outline: none !important; }



    :root {
      --white: #FFFFFF;
      --gray-50: #F8FAFC;
      --gray-100: #F1F5F9;
      --gray-200: #E2E8F0;
      --gray-300: #CBD5E1;
      --gray-500: #64748B;
      --gray-700: #334155;
      --gray-900: #0F172A;
      --blue-primary: #0066FF;
      --blue-light: #3388FF;
      --cyan-accent: #00D4FF;
      --gold: #D4AF37;
      --gold-light: #E8C547;
      --purple: #8B5CF6;
      --green: #10B981;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
      --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
      --shadow-lg: 0 8px 24px rgba(0,0,0,0.1);
      --shadow-xl: 0 12px 32px rgba(0,0,0,0.12);
      --radius: 12px;
      --radius-lg: 16px;
      --radius-btn: 50px;
      --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }

    * { margin: 0; padding: 0; box-sizing: border-box; }
    html { scroll-behavior: smooth; font-size: 16px; }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      color: var(--gray-900);
      line-height: 1.7;
      background: var(--white);
    }
    a { text-decoration: none; color: inherit; transition: var(--transition); }
    ul { list-style: none; }
    img { max-width: 100%; display: block; }
    .container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
    .section { padding: 100px 0; }

    /* Navigation */
    .nav { position: fixed; top: 0; left: 0; right: 0; z-index: 1000; background: rgba(255,255,255,0.85); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); border-bottom: 1px solid rgba(0,0,0,0.05); transition: var(--transition); }
    .nav.scrolled { background: rgba(255,255,255,0.95); backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px); box-shadow: 0 2px 12px rgba(0,0,0,0.08); }
    .nav-inner { display: flex; align-items: center; justify-content: space-between; padding: 16px 24px; max-width: 1200px; margin: 0 auto; }
    .logo { font-size: 1.25rem; font-weight: 800; color: var(--blue-primary); display: flex; align-items: center; gap: 10px; }
    .logo span { font-weight: 500; font-size: 0.85rem; color: var(--gray-500); }
    .nav-links { display: flex; gap: 32px; align-items: center; }
    .nav-links a { font-size: 0.95rem; font-weight: 500; color: var(--gray-700); position: relative; outline: none !important; }
    .nav-links a:hover, .nav-links a.active { color: var(--blue-primary); }
    .nav-links a::after { content: ''; position: absolute; bottom: -4px; left: 0; width: 0; height: 2px; background: var(--blue-primary); transition: width 0.3s; }
    .nav-links a:hover::after, .nav-links a.active::after { width: 100%; }
    .nav-toggle { display: none; background: none; border: none; cursor: pointer; }
    .nav-toggle svg { width: 24px; height: 24px; }

    /* 面包屑 */
    .breadcrumb {
      max-width: 1200px;
      margin: 88px auto 0;
      padding: 16px 24px 0;
      font-size: 0.9rem;
      color: var(--gray-600);
    }

    .breadcrumb a {
      color: var(--blue-primary);
      text-decoration: none;
    }

    .breadcrumb span {
      margin: 0 8px;
      color: var(--gray-200);
    }

    /* 案例详情 */
    .case-detail {
      max-width: 1200px;
      margin: 24px auto 0;
      padding: 0 24px 80px;
    }

    .case-header {
      margin-bottom: 48px;
    }

    .case-name-row {
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 16px;
      flex-wrap: wrap;
    }

    .case-badges {
      display: flex;
      gap: 8px;
      flex-wrap: wrap;
    }

    .case-badge {
      padding: 6px 16px;
      border-radius: 50px;
      font-size: 0.85rem;
      font-weight: 600;
    }

    .badge-power { background: rgba(0, 102, 255, 0.1); color: var(--primary); }
    .badge-telecom { background: rgba(0, 212, 255, 0.1); color: #0099CC; }
    .badge-metallurgy { background: rgba(212, 175, 55, 0.1); color: var(--gold); }
    .badge-rail { background: rgba(139, 92, 246, 0.1); color: #8B5CF6; }
    .badge-energy { background: rgba(34, 197, 94, 0.1); color: #22C55E; }

    .case-title {
      font-size: 2.5rem;
      font-weight: 800;
      line-height: 1.3;
      margin-bottom: 16px;
    }

    .case-subtitle {
      font-size: 1.1rem;
      color: var(--gray-600);
      line-height: 1.8;
    }

    .case-main {
      display: grid;
      grid-template-columns: 1fr 360px;
      gap: 48px;
      margin-bottom: 64px;
    }

    .case-left {
      display: flex;
      flex-direction: column;
      gap: 32px;
    }

    .case-info-card {
      background: var(--gray-50);
      border-radius: 12px;
      padding: 24px;
    }

    .case-info-card h3 {
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 16px;
      color: var(--gray-800);
    }

    .info-list {
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .info-item {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding-bottom: 12px;
      border-bottom: 1px solid var(--gray-200);
    }

    .info-item:last-child {
      border-bottom: none;
      padding-bottom: 0;
    }

    .info-label {
      color: var(--gray-600);
      font-weight: 500;
      font-size: 0.95rem;
    }

    .info-value {
      color: var(--gray-800);
      font-weight: 600;
      font-size: 0.95rem;
      text-align: right;
    }

    .case-products {
      background: var(--gray-50);
      border-radius: 12px;
      padding: 24px;
    }

    .case-products h3 {
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 16px;
      color: var(--gray-800);
    }

    .product-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
    }

    .product-tag {
      background: var(--white);
      border: 1px solid var(--gray-200);
      padding: 8px 16px;
      border-radius: 50px;
      font-size: 0.9rem;
      font-weight: 500;
      color: var(--gray-800);
    }

    .case-right {
      display: flex;
      flex-direction: column;
      gap: 24px;
    }

    .case-sidebar-card {
      background: var(--white);
      border: 1px solid var(--gray-200);
      border-radius: 12px;
      padding: 24px;
    }

    .case-sidebar-card h3 {
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 16px;
      color: var(--gray-800);
    }

    .sidebar-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .sidebar-list li {
      padding: 12px 0;
      border-bottom: 1px solid var(--gray-200);
      font-size: 0.95rem;
      color: var(--gray-600);
    }

    .sidebar-list li:last-child {
      border-bottom: none;
    }

    .sidebar-list strong {
      color: var(--gray-800);
      font-weight: 600;
      display: block;
      margin-bottom: 4px;
    }

    .case-cta {
      margin-top: 24px;
    }

    .btn-primary {
      display: block;
      background: var(--primary);
      color: var(--white);
      padding: 14px 32px;
      border-radius: 50px;
      text-align: center;
      text-decoration: none;
      font-weight: 700;
      font-size: 1rem;
      transition: all 0.3s;
    }

    .btn-primary:hover {
      background: #0052CC;
      transform: translateY(-2px);
      box-shadow: 0 4px 12px rgba(0, 102, 255, 0.3);
    }

    .btn-primary-inline {
      display: inline-block;
      background: var(--blue-primary);
      color: var(--white);
      padding: 8px 20px;
      border-radius: 50px;
      text-decoration: none;
      font-weight: 600;
      font-size: 0.9rem;
      transition: all 0.3s;
      white-space: nowrap;
    }

    .btn-primary-inline:hover {
      background: #0052CC;
      transform: translateY(-1px);
      box-shadow: 0 2px 8px rgba(0, 102, 255, 0.25);
    }

    /* 相关案例 */
    .related-section {
      border-top: 1px solid var(--gray-200);
      padding-top: 48px;
    }

    .related-section h2 {
      font-size: 1.5rem;
      font-weight: 800;
      margin-bottom: 32px;
    }

    .related-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .related-card {
      background: var(--white);
      border: 1px solid var(--gray-200);
      border-radius: 12px;
      padding: 24px;
      text-decoration: none;
      color: inherit;
      transition: all 0.3s;
      display: flex;
      flex-direction: column;
    }

    .related-card:hover {
      transform: translateY(-4px);
      box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
      border-color: var(--primary);
    }

    .related-card-tag {
      display: inline-block;
      padding: 4px 12px;
      border-radius: 50px;
      font-size: 0.8rem;
      font-weight: 600;
      margin-bottom: 12px;
    }

    .related-card h3 {
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 8px;
      line-height: 1.4;
    }

    .related-card p {
      font-size: 0.9rem;
      color: var(--gray-600);
      line-height: 1.6;
    }

    /* 页脚 */
    .footer { background: var(--gray-900); color: var(--gray-300); padding: 60px 0 30px; border-top: 1px solid #E2E8F0; }
.footer-grid { display: grid; grid-template-columns: 1.2fr 1fr 1fr 1fr 1fr; gap: 48px; margin-bottom: 48px; }
.footer h4 { color: var(--white); font-size: 1rem; font-weight: 700; margin-bottom: 20px; }
.footer p, .footer li { font-size: 0.9rem; line-height: 1.8; margin-bottom: 8px; }
.footer a:hover { color: var(--white); }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.1); padding-top: 24px; text-align: center; font-size: 0.85rem; }

    
    /* 响应式 */
    @media (max-width: 1024px) {
      .case-main {
        grid-template-columns: 1fr;
      }

      .related-grid {
        grid-template-columns: repeat(2, 1fr);
      }

      
    @media (max-width: 768px) {
      .nav-links { display: flex; gap: 32px; align-items: center; }

      .related-grid {
        grid-template-columns: 1fr;
      }

      
    /* 动画 */
    .fade-in {
      opacity: 0;
      transform: translateY(20px);
      transition: opacity 0.6s ease, transform 0.6s ease;
    }

    .fade-in.visible {
      opacity: 1;
      transform: translateY(0);
    }