: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; }

/* 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: all 0.3s cubic-bezier(0.4, 0, 0.2, 1); }
.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 img { height: 40px; width: auto; margin-right: 8px; }
.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-toggle svg { width: 24px; height: 24px; }

/* Page Hero - 产品中心风格 */
.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;
}

/* 右下角产品/车间场景线框图 */
.page-hero-scene {
  position: absolute;
  right: 80px;
  top: 50%;
  transform: translateY(-50%);
  width: 420px;
  height: 360px;
  opacity: 0.25;
  pointer-events: none;
}
.page-hero-scene svg { width: 100%; height: 100%; }

.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; }

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

/* Solutions Grid */
.solutions-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 32px; margin-bottom: 80px; }

/* 电力行业宽版横幅 */
.solution-hero-banner {
  background: linear-gradient(135deg, rgba(0,102,255,0.04) 0%, rgba(0,102,255,0.08) 100%);
  border: 2px solid rgba(0,102,255,0.15);
  border-radius: var(--radius-lg);
  padding: 48px;
  margin-bottom: 32px;
  display: flex;
  align-items: center;
  gap: 48px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  min-height: 320px;
}
.solution-hero-banner::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--blue-primary), var(--blue-light));
}
.solution-hero-banner:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(0,102,255,0.12);
  border-color: var(--blue-primary);
}
.solution-hero-icon {
  width: 120px;
  height: 120px;
  flex-shrink: 0;
  background: rgba(0,102,255,0.08);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
}
.solution-hero-icon svg {
  width: 64px;
  height: 64px;
}
.solution-hero-content {
  flex: 1;
}
.solution-hero-content h3 {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--gray-900);
}
.solution-position {
  font-size: 1.1rem;
  color: var(--blue-primary);
  font-weight: 600;
  margin-bottom: 24px;
}
.product-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 24px;
}
.product-tag {
  padding: 8px 16px;
  background: var(--gray-100);
  color: var(--gray-700);
  border: 1px solid var(--gray-300);
  border-radius: 50px;
  font-size: 0.85rem;
  font-weight: 500;
}
.solution-cases {
  margin-bottom: 24px;
}
.solution-cases ul {
  list-style: none;
  padding: 0;
  margin: 0;
}
.solution-cases li {
  position: relative;
  padding-left: 20px;
  margin-bottom: 8px;
  font-size: 0.95rem;
  color: var(--gray-600);
  line-height: 1.6;
}
.solution-cases li::before {
  content: '•';
  position: absolute;
  left: 0;
  color: var(--blue-primary);
  font-weight: 700;
}
.solution-cta {
  padding-top: 24px;
  border-top: 1px solid var(--gray-200);
}
.solution-cta-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--blue-primary);
  text-decoration: none;
  transition: var(--transition);
}
.solution-cta-link::after {
  content: '→';
  font-size: 1.2rem;
  transition: var(--transition);
}
.solution-cta-link:hover {
  color: var(--blue-dark);
}
.solution-cta-link:hover::after {
  transform: translateX(4px);
}

/* 其他卡片 */
.solutions-grid .solution-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  height: 100%;
  min-height: 480px;
}
.solutions-grid .solution-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
  border-color: var(--blue-primary);
}
.solution-card-body {
  padding: 32px;
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.solution-icon {
  width: 64px;
  height: 64px;
  background: var(--gray-50);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}
.solution-icon svg {
  width: 36px;
  height: 36px;
}
.solution-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--gray-900);
}
.solution-card .solution-position {
  font-size: 0.95rem;
  margin-bottom: 20px;
}
.solutions-grid .solution-card .product-tag {
  padding: 6px 12px;
  background: var(--gray-100);
  color: var(--gray-700);
  border: 1px solid var(--gray-300);
  border-radius: 50px;
  font-size: 0.8rem;
}
.solutions-grid .solution-card .solution-cases li {
  font-size: 0.9rem;
}
.solution-card.power::before { background: linear-gradient(90deg, var(--blue-primary), var(--blue-light)); }
.solution-card.comm::before { background: linear-gradient(90deg, var(--cyan-accent), #00E5FF); }
.solution-card.metal::before { background: linear-gradient(90deg, var(--gold), var(--gold-light)); }
.solution-card.rail::before { background: linear-gradient(90deg, var(--purple), #A78BFA); }
.solution-card.energy::before { background: linear-gradient(90deg, var(--green), #34D399); }

.solution-card-body { padding: 32px; display: flex; flex-direction: column; flex: 1; }

/* 行业图标 */
.solution-icon { width: 64px; height: 64px; background: var(--gray-50); border-radius: var(--radius); display: flex; align-items: center; justify-content: center; margin-bottom: 20px; }
.solution-icon svg { width: 36px; height: 36px; }

/* 标题和定位 */
.solution-card h3 { font-size: 1.35rem; font-weight: 700; margin-bottom: 8px; color: var(--gray-900); }
.solution-position { font-size: 0.95rem; color: var(--blue-primary); font-weight: 600; margin-bottom: 24px; line-height: 1.6; }

/* 适用产品 Pill 标签 */
.product-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 24px; }
.product-tag { padding: 6px 14px; background: var(--gray-100); color: var(--gray-700); border-radius: 50px; font-size: 0.8rem; font-weight: 500; border: 1px solid var(--gray-200); }

/* 代表案例 - 精简展示 */
.solution-cases { margin-bottom: 24px; flex: 1; }
.solution-cases ul { margin: 0; padding: 0; list-style: none; }
.solution-cases li { font-size: 0.9rem; color: var(--gray-600); padding: 4px 0 4px 16px; position: relative; line-height: 1.6; }
.solution-cases li::before { content: '·'; position: absolute; left: 0; color: var(--blue-primary); font-weight: 700; }

/* CTA Section */
.cta-section { background: #F8FAFC; color: var(--gray-900); padding: 80px 0; text-align: center; border-radius: var(--radius-lg); margin-top: 40px; }
.cta-section h2 { font-size: 2rem; font-weight: 800; margin-bottom: 12px; }
.cta-section p { font-size: 1.1rem; color: var(--gray-500); margin-bottom: 32px; }
.cta-section .btn-primary { background: var(--blue-primary); color: var(--white); }
.cta-section .btn-primary:hover { background: var(--blue-light); transform: translateY(-2px); box-shadow: 0 8px 20px rgba(0,102,255,0.3); }
.cta-section .btn-outline { border: 2px solid var(--blue-primary); color: var(--blue-primary); background: transparent; }
.cta-section .btn-outline:hover { background: var(--blue-primary); color: var(--white); }
.cta-btns { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

/* CTA 按钮反白风格 - 蓝色背景上的白色按钮 */
.cta-btn-white { background: var(--blue-primary); color: var(--white); border: 2px solid var(--blue-primary); border-radius: var(--radius-btn); padding: 14px 36px; font-size: 0.95rem; font-weight: 600; cursor: pointer; transition: var(--transition); display: inline-flex; align-items: center; justify-content: center; text-decoration: none; }
.cta-btn-white:hover { background: var(--blue-light); transform: translateY(-2px); box-shadow: 0 8px 20px rgba(0,102,255,0.3); }
.cta-btn-white-outline { background: transparent; color: var(--blue-primary); border: 2px solid var(--blue-primary); border-radius: var(--radius-btn); padding: 14px 36px; font-size: 0.95rem; font-weight: 600; cursor: pointer; transition: var(--transition); display: inline-flex; align-items: center; justify-content: center; text-decoration: none; }
.cta-btn-white-outline:hover { background: var(--blue-primary); color: var(--white); transform: translateY(-2px); }

/* Scroll Animation */
.fade-in { opacity: 0; transform: translateY(30px); transition: opacity 0.6s ease-out, transform 0.6s ease-out; }
.fade-in.visible { opacity: 1; transform: translateY(0); }

/* Responsive */
@media (max-width: 1024px) {
  .solutions-grid { grid-template-columns: repeat(2, 1fr); }
  .solution-hero-banner {
    flex-direction: column;
    text-align: center;
    padding: 32px;
  }
  .solution-hero-icon {
    width: 80px;
    height: 80px;
  }
  .solution-hero-icon svg {
    width: 48px;
    height: 48px;
  }
  .page-hero { padding: 140px 0 80px; }
  .page-hero h1 { font-size: 2rem; }
  .page-hero-wave { height: 50px; }
  .page-hero-content { max-width: 100%; }
  .page-hero-scene { display: none; }
  .page-hero .container { justify-content: center; text-align: center; }
}
@media (max-width: 768px) {
  .nav-links { display: none !important; }
  .nav-toggle { display: block; }
  .nav-links.show { display: flex; flex-direction: column; position: absolute; top: 72px; left: 0; right: 0; background: white; padding: 24px; box-shadow: var(--shadow-md); gap: 16px; }
  .solutions-grid { grid-template-columns: 1fr; }
  .solution-hero-banner {
    flex-direction: column;
    text-align: center;
    padding: 32px 24px;
  }
  .solution-hero-icon {
    width: 80px;
    height: 80px;
  }
  .solution-hero-icon svg {
    width: 48px;
    height: 48px;
  }
  .page-hero { padding: 140px 0 80px; }
  .page-hero h1 { font-size: 2rem; }
  .section { padding: 60px 16px; }
  .cta-section { padding: 60px 16px; }
  .cta-section h2 { font-size: 1.5rem; }
  .cta-section p { font-size: 1rem; }
}
/* 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; }