/* ===== 微变电子 - 科技物联网设计系统 v3 ===== */
/* Design: Bright IoT / Clean Tech — 明亮科技风 */

:root {
  /* Brand Colors */
  --primary: #1E52DD;
  --primary-light: #2768F7;
  --primary-lighter: #3E89F6;
  --primary-lightest: #DBEAFE;
  --primary-dark: #203D91;
  --accent: #0F7A97;
  --accent-light: #0898BB;

  /* Semantic */
  --success: #059669;
  --success-light: #10B981;
  --success-bg: #D1FAE5;
  --warning: #D97706;
  --warning-light: #F59E0B;
  --warning-bg: #FEF3C7;
  --danger: #DC2626;
  --info: #7C3AED;
  --info-light: #8B5CF6;
  --info-bg: #EDE9FE;

  /* Neutrals */
  --dark: #10182C;
  --dark-800: #202B3E;
  --dark-700: #36475D;
  --dark-600: #475569;
  --gray-500: #64748B;
  --gray-400: #94A3B8;
  --gray-300: #CBD5E1;
  --gray-200: #E2E8F0;
  --gray-100: #F1F5F9;
  --gray-50: #F8FAFC;
  --white: #FFFFFF;

  /* Gradients */
  --grad-primary: linear-gradient(135deg, #1E52DD 0%, #0F7A97 100%);
  --grad-hero: linear-gradient(160deg, #0B152A 0%, #152656 40%, #0B152A 100%);
  --grad-hero-accent: radial-gradient(ellipse 80% 60% at 50% 0%, rgba(37,99,235,0.15) 0%, transparent 70%);
  --grad-card: linear-gradient(135deg, rgba(37,99,235,0.04) 0%, rgba(8,145,178,0.02) 100%);

  /* Glass */
  --glass: rgba(255,255,255,0.85);
  --glass-border: rgba(226,232,240,0.9);
  --glass-strong: rgba(255,255,255,0.95);

  /* Shadows */
  --shadow-xs: 0 1px 2px rgba(15,23,42,0.04);
  --shadow-sm: 0 1px 3px rgba(15,23,42,0.06), 0 1px 2px rgba(15,23,42,0.04);
  --shadow: 0 2px 8px rgba(15,23,42,0.06), 0 1px 2px rgba(15,23,42,0.04);
  --shadow-md: 0 4px 16px rgba(15,23,42,0.08);
  --shadow-lg: 0 8px 32px rgba(15,23,42,0.08);
  --shadow-xl: 0 16px 48px rgba(15,23,42,0.1);
  --shadow-primary: 0 4px 20px rgba(37,99,235,0.2);
  --shadow-primary-lg: 0 8px 40px rgba(37,99,235,0.25);

  /* Radius */
  --r-sm: 8px;
  --r: 12px;
  --r-lg: 16px;
  --r-xl: 20px;
  --r-2xl: 24px;
  --r-full: 9999px;

  /* Motion */
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);
  --t: all 0.3s var(--ease);
  --t-fast: all 0.15s ease;

  /* Spacing */
  --container: 1240px;
  --nav-h: 72px;
}

/* ===== Reset ===== */
*, *::before, *::after { 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(--dark-700);
  background: var(--white);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
::selection { background: var(--primary-lightest); color: var(--primary-dark); }
img { max-width:100%; display:block; }
a { color: inherit; }

/* ===== Scrollbar ===== */
::-webkit-scrollbar { width:6px; }
::-webkit-scrollbar-track { background:var(--gray-100); }
::-webkit-scrollbar-thumb { background:var(--gray-300); border-radius:3px; }
::-webkit-scrollbar-thumb:hover { background:var(--gray-400); }

/* ===== Container ===== */
.container { max-width:var(--container); margin:0 auto; padding:0 24px; }

/* ===== Navigation ===== */
.navbar {
  position:fixed; top:0; left:0; right:0; height:var(--nav-h);
  background: var(--glass-strong);
  backdrop-filter: blur(24px); -webkit-backdrop-filter: blur(24px);
  border-bottom: 1px solid var(--gray-200);
  z-index:1000; transition: var(--t);
}
.navbar.scrolled {
  height:60px;
  box-shadow: var(--shadow-sm);
  background: rgba(255,255,255,0.98);
}
.navbar .container { display:flex; align-items:center; justify-content:space-between; height:100%; }

.navbar-brand { display:flex; align-items:center; gap:10px; text-decoration:none; }
.logo-img { height:36px; width:auto; display:block; }
.footer-logo-img { width:88px; height:82px; margin-bottom:14px; display:block; }

.navbar-menu { display:flex; align-items:center; gap:28px; }
.navbar-menu a {
  color:var(--dark-600); text-decoration:none; font-size:14.5px; font-weight:500;
  transition: var(--t-fast); position:relative;
}
.navbar-menu a:hover { color:var(--primary); }
.navbar-menu a.active { color:var(--primary); font-weight:600; }
.navbar-menu a.active::after {
  content:''; position:absolute; bottom:-6px; left:50%; transform:translateX(-50%);
  width:20px; height:2px; background:var(--primary); border-radius:1px;
}

.btn-login {
  background:var(--grad-primary)!important; color:#fff!important;
  padding:9px 22px!important; border-radius:var(--r-sm)!important;
  font-weight:600!important; font-size:14px!important;
  box-shadow: var(--shadow-primary); transition: var(--t)!important;
}
.btn-login:hover { transform:translateY(-1px); box-shadow: var(--shadow-primary-lg); }

.btn-contact {
  background:transparent !important; color:var(--primary) !important;
  border:1.5px solid var(--primary) !important;
  padding:8px 20px !important; border-radius:var(--r-sm) !important;
  font-weight:600 !important; font-size:14px !important;
  box-shadow:none !important; transition: var(--t) !important;
}
.btn-contact:hover {
  background:var(--primary) !important; color:#fff !important;
  transform:translateY(-1px); box-shadow: var(--shadow-primary-lg);
}

.mobile-toggle { display:none; flex-direction:column; gap:5px; background:none; border:none; cursor:pointer; padding:8px; }
.mobile-toggle span { width:22px; height:2px; background:var(--dark-600); border-radius:2px; transition:var(--t-fast); }

/* ===== Hero ===== */
.hero {
  min-height:70vh; display:flex; align-items:center;
  background: var(--grad-hero);
  position:relative; overflow:hidden; padding-top:var(--nav-h);
}
.hero::before {
  content:''; position:absolute; inset:0;
  background:
    radial-gradient(ellipse 45% 50% at 35% 30%, rgba(30,64,175,0.16) 0%, transparent 65%),
    radial-gradient(ellipse 45% 45% at 70% 50%, rgba(14,116,144,0.11) 0%, transparent 65%),
    radial-gradient(ellipse 60% 30% at 50% 80%, rgba(55,48,163,0.084) 0%, transparent 70%);
  pointer-events:none;
}
.hero::after {
  content:''; position:absolute; inset:0;
  background-image:
    linear-gradient(rgba(37,99,235,0.042) 1px, transparent 1px),
    linear-gradient(90deg, rgba(37,99,235,0.042) 1px, transparent 1px);
  background-size:60px 60px;
  pointer-events:none;
}
.hero .container {
  display:grid; grid-template-columns:1fr 1fr; gap:80px; align-items:center;
  position:relative; z-index:1;
}
.hero-badge {
  display:inline-flex; align-items:center; gap:8px;
  background:rgba(29,78,216,0.15); border:1px solid rgba(29,78,216,0.3);
  padding:7px 16px; border-radius:var(--r-full);
  font-size:13px; font-weight:600; color:#7CB8F0;
  margin-bottom:24px; letter-spacing:0.02em;
}
.hero h1 {
  font-size:54px; font-weight:800; line-height:1.1;
  margin-bottom:24px; letter-spacing:-0.03em; color:#fff;
}
.hero h1 .hl {
  background:var(--grad-primary); -webkit-background-clip:text;
  -webkit-text-fill-color:transparent; background-clip:text;
}
.hero .hero-desc {
  font-size:17px; color:rgba(255,255,255,0.72); line-height:1.8; margin-bottom:40px; max-width:520px;
}
.hero-actions { display:flex; gap:14px; flex-wrap:wrap; }
/* ===== Hero Carousel ===== */
.hero-carousel {
  position: relative;
  width: 100%;
  height: 420px;
  overflow: hidden;
  border-radius: 16px;
  box-shadow:
    0 4px 24px rgba(0,0,0,0.06),
    0 1px 4px rgba(0,0,0,0.04);
}
.hero-carousel-track {
  display: flex;
  height: 100%;
  transition: transform 0.7s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}
.hero-carousel-slide {
  min-width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.5s ease;
}
.hero-carousel-slide img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  padding: 20px;
  border-radius: 12px;
  transition: transform 0.5s ease;
}
.hero-carousel:hover .hero-carousel-slide img {
  transform: scale(1.02);
}

/* 指示器 */
.hero-carousel-nav {
  display: none;
  position: absolute;
  bottom: -20px;
  left: 50%;
  transform: translateX(-50%);
  gap: 10px;
  z-index: 3;
  padding: 6px 14px;
  background: rgba(0,0,0,0.15);
  backdrop-filter: blur(10px);
  border-radius: 20px;
}
.hero-carousel-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(255,255,255,0.45);
  border: none;
  cursor: pointer;
  transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  padding: 0;
  position: relative;
}
.hero-carousel-dot:hover {
  background: rgba(255,255,255,0.7);
  transform: scale(1.2);
}
.hero-carousel-dot.active {
  background: var(--primary);
  width: 28px;
  border-radius: 5px;
  box-shadow: 0 0 12px rgba(37, 99, 235, 0.4);
}

/* 左右箭头 */
.hero-carousel-arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 3;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid rgba(255,255,255,0.2);
  background: rgba(255,255,255,0.12);
  backdrop-filter: blur(8px);
  color: #fff;
  font-size: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  transition: all 0.3s ease;
  outline: none;
}
.hero-carousel-arrow:hover {
  background: rgba(255,255,255,0.22);
  border-color: rgba(255,255,255,0.35);
  box-shadow: 0 0 18px rgba(37, 99, 235, 0.25);
  transform: translateY(-50%) scale(1.08);
}
.hero-carousel-arrow:active {
  transform: translateY(-50%) scale(0.95);
}
.hero-carousel-arrow.prev { left: 16px; }
.hero-carousel-arrow.next { right: 16px; }
.hero-carousel:hover .hero-carousel-arrow {
  opacity: 1;
}

/* 移动端箭头始终可见 */
@media (max-width: 768px) {
  .hero-carousel-arrow {
    opacity: 1;
  }
}

/* 箭头SVG图标 */
.hero-carousel-arrow svg {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2.5;
  stroke-linecap: round;
  stroke-linejoin: round;
}

@media (max-width: 768px) {
  .hero .container { grid-template-columns: 1fr; gap: 32px; }
  .hero-carousel {
    height: 280px;
    border-radius: 12px;
  }
  .hero-carousel-slide img {
    padding: 12px;
  }
  .hero-carousel-nav {
    bottom: 12px;
    gap: 8px;
    padding: 5px 12px;
  }
  .hero-carousel-dot {
    width: 8px;
    height: 8px;
  }
  .hero-carousel-dot.active {
    width: 22px;
    border-radius: 4px;
  }
  .hero-carousel-arrow {
    width: 36px;
    height: 36px;
    font-size: 15px;
  }
  .hero-carousel-arrow.prev { left: 8px; }
  .hero-carousel-arrow.next { right: 8px; }
}


/* ===== Buttons ===== */
.btn {
  display:inline-flex; align-items:center; justify-content:center; gap:8px;
  padding:13px 30px; border-radius:var(--r-sm);
  font-size:15px; font-weight:600; text-decoration:none;
  cursor:pointer; border:none; transition:var(--t); white-space:nowrap;
}
.btn-accent { background:var(--grad-primary); color:#fff; box-shadow:var(--shadow-primary); }
.btn-accent:hover { transform:translateY(-2px); box-shadow:var(--shadow-primary-lg); }
.btn-white { background:rgba(255,255,255,0.1); color:#fff; border:1px solid rgba(255,255,255,0.2); }
.btn-white:hover { background:rgba(255,255,255,0.16); transform:translateY(-1px); box-shadow:0 4px 16px rgba(37,99,235,0.15); }
.btn-outline { background:transparent; border:1.5px solid var(--gray-300); color:var(--dark-700); }
.btn-outline:hover { border-color:var(--primary); color:var(--primary); }
.btn-primary { background:var(--grad-primary); color:#fff; box-shadow:var(--shadow-primary); }
.btn-primary:hover { transform:translateY(-2px); box-shadow:var(--shadow-primary-lg); }
.btn-sm { padding:10px 20px; font-size:14px; }

/* ===== Section Common ===== */
.section { padding:100px 0; position:relative; }
.section-title {
  font-size:38px; font-weight:800; text-align:center;
  margin-bottom:12px; color:var(--dark); letter-spacing:-0.02em;
}
.section-sub {
  font-size:17px; color:var(--dark-600); text-align:center;
  max-width:560px; margin:0 auto 56px; line-height:1.7;
}

/* ===== Products Section ===== */
.category-header {
  display:flex; gap:20px; margin-bottom:28px; padding:20px 24px;
  background:var(--white); border:1px solid var(--gray-200);
  border-radius:var(--r-lg); box-shadow:var(--shadow-xs);
}
.category-icon {
  width:56px; height:56px; background:var(--grad-primary);
  border-radius:var(--r); display:flex; align-items:center; justify-content:center;
  font-size:28px; flex-shrink:0; box-shadow:var(--shadow-primary);
}
.category-header h3 { font-size:18px; font-weight:700; color:var(--dark); margin-bottom:2px; }
.category-header p { font-size:13.5px; color:var(--dark-600); }

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

.product-card {
  background:var(--white); border:1px solid var(--gray-200);
  border-radius:var(--r-lg); overflow:hidden;
  transition:var(--t); box-shadow:var(--shadow-xs);
}
.product-card:hover {
  transform:translateY(-6px); border-color:var(--primary-lighter);
  box-shadow:var(--shadow-lg), var(--shadow-primary);
}
.product-card-image { height:210px; background:var(--gray-100); position:relative; overflow:hidden; }
.product-card-image img { width:100%; height:100%; object-fit:cover; }
.image-placeholder {
  width:100%; height:100%;
  background:linear-gradient(135deg, var(--primary-lightest) 0%, var(--gray-100) 100%);
  display:flex; flex-direction:column; align-items:center; justify-content:center;
  color:var(--primary-light); font-size:56px; gap:8px;
}
.image-placeholder span { font-size:13px; font-weight:600; color:var(--dark-600); }
.product-card-badge {
  position:absolute; top:12px; right:12px;
  background:var(--warning); color:#fff;
  padding:5px 12px; border-radius:var(--r-full);
  font-size:11.5px; font-weight:700; letter-spacing:0.02em;
}
.product-card-body { padding:22px; }
.product-card-body h3 { font-size:17px; font-weight:700; color:var(--dark); margin-bottom:10px; }
.product-card-body p { font-size:13.5px; color:var(--dark-600); line-height:1.7; margin-bottom:14px; }
.product-card-tags { display:flex; flex-wrap:wrap; gap:6px; margin-bottom:18px; }
.product-tag {
  background:var(--primary-lightest); color:var(--primary);
  padding:4px 10px; border-radius:var(--r-full);
  font-size:11.5px; font-weight:600;
}
.product-card-footer { padding-top:14px; border-top:1px solid var(--gray-100); }

/* ===== Features Grid ===== */
.features-grid { display:grid; grid-template-columns:repeat(3,1fr); gap:20px; }
.feature-card {
  background:var(--white); border:1px solid var(--gray-200);
  border-radius:var(--r-lg); padding:28px;
  transition:var(--t); box-shadow:var(--shadow-xs);
}
.feature-card:hover {
  border-color:var(--primary-lighter);
  box-shadow:var(--shadow-md), var(--shadow-primary);
  transform:translateY(-4px);
}
.feature-card-icon { font-size:32px; margin-bottom:14px; }
.feature-card h4 { font-size:15.5px; font-weight:700; color:var(--dark); margin-bottom:8px; }
.feature-card p { font-size:13.5px; color:var(--dark-600); line-height:1.7; }

/* ===== Solution Section ===== */
.solution-section { background: var(--gray-50); }

.solution-iot-intro {
  display:grid; grid-template-columns:1fr auto; gap:56px;
  align-items:center; margin-bottom:56px;
  background: var(--white);
  border:1px solid var(--gray-200);
  border-radius: var(--r-2xl);
  padding:44px;
  box-shadow: var(--shadow-sm);
  position:relative; overflow:hidden;
}
.solution-iot-intro::before {
  content:''; position:absolute; top:0; left:0; right:0; height:3px;
  background: linear-gradient(90deg, var(--primary), var(--accent), var(--info-light), var(--primary));
  background-size:300% 100%;
  animation: gradShift 6s ease infinite;
}
@keyframes gradShift { 0%,100%{background-position:0% 50%} 50%{background-position:100% 50%} }

.solution-iot-badge {
  display:inline-flex; align-items:center; gap:6px;
  background: var(--primary-lightest);
  padding:6px 14px; border-radius:var(--r-full);
  font-size:12.5px; font-weight:700; color:var(--primary);
  margin-bottom:16px; letter-spacing:0.02em;
}
.solution-iot-left h3 {
  font-size:26px; font-weight:800; color:var(--dark);
  margin-bottom:14px; letter-spacing:-0.02em;
}
.solution-iot-left p {
  font-size:15px; color:var(--dark-600); line-height:1.8;
  max-width:480px;
}

.solution-iot-stats {
  display:grid; grid-template-columns:1fr 1fr; gap:20px;
  background: var(--gray-50);
  border:1px solid var(--gray-200);
  border-radius: var(--r-xl);
  padding:28px 32px;
}
.solution-stat { text-align:center; padding:8px; }
.solution-stat-num {
  font-size:2.4rem; font-weight:800; line-height:1;
  background: var(--grad-primary);
  -webkit-background-clip:text; -webkit-text-fill-color:transparent; background-clip:text;
}
.solution-stat-suffix {
  font-size:1.2rem; font-weight:700;
  -webkit-text-fill-color: var(--primary-lighter);
}
.solution-stat-label {
  font-size:12.5px; color:var(--gray-500); margin-top:6px; font-weight:500;
}

/* IoT Capabilities */
.solution-capabilities {
  display:grid; grid-template-columns:repeat(3,1fr); gap:16px;
  margin-bottom:40px;
}
.solution-cap {
  display:flex; gap:14px; padding:20px;
  background: var(--white);
  border:1px solid var(--gray-200);
  border-radius: var(--r-lg);
  transition:var(--t);
  box-shadow: var(--shadow-xs);
}
.solution-cap:hover {
  border-color:var(--primary-lighter);
  box-shadow:var(--shadow-md), var(--shadow-primary);
  transform:translateY(-3px);
}
.solution-cap-icon {
  width:48px; height:48px; border-radius:var(--r);
  display:flex; align-items:center; justify-content:center;
  font-size:1.3rem; flex-shrink:0;
}
.solution-cap-text h4 {
  font-size:14.5px; font-weight:700; color:var(--dark); margin-bottom:4px;
}
.solution-cap-text p {
  font-size:12.5px; color:var(--dark-600); line-height:1.7;
}

/* Solution Flow */
.solution-flow {
  display:flex; align-items:center; justify-content:center;
  gap:8px; flex-wrap:wrap; margin-bottom:12px;
}
.solution-flow-step {
  display:flex; flex-direction:column; align-items:center; gap:6px;
  background: var(--white);
  border:1px solid var(--gray-200);
  border-radius: var(--r-lg);
  padding:16px 22px;
  transition:var(--t);
}
.solution-flow-step:hover {
  border-color:var(--primary-lighter);
  box-shadow: var(--shadow-md);
  transform:translateY(-2px);
}
.solution-flow-icon { font-size:24px; }
.solution-flow-label { font-size:12.5px; font-weight:600; color:var(--dark-700); white-space:nowrap; }
.solution-flow-arrow {
  color:var(--primary-light); display:flex; align-items:center;
  flex-shrink:0;
}

/* ===== Scenarios ===== */
.scenarios-grid { display:grid; grid-template-columns:repeat(4,1fr); gap:20px; }
.scenario-card {
  height:260px; background:var(--dark); border-radius:var(--r-lg);
  position:relative; overflow:hidden; cursor:pointer; transition:var(--t);
  border:1px solid rgba(255,255,255,0.05);
}
.scenario-card:hover {
  transform:translateY(-6px);
  box-shadow:var(--shadow-xl);
  border-color:var(--primary-lighter);
}
.scenario-card-overlay {
  position:absolute; inset:0;
  background:linear-gradient(to top, rgba(15,23,42,0.95) 0%, rgba(15,23,42,0.3) 100%);
  padding:24px; display:flex; flex-direction:column; justify-content:flex-end;
}
.scenario-card-icon { font-size:36px; margin-bottom:10px; }
.scenario-card h4 { font-size:17px; font-weight:700; color:#fff; margin-bottom:6px; }
.scenario-card p { font-size:12.5px; color:var(--gray-400); line-height:1.6; }

/* ===== About Section ===== */
.about-grid { display:grid; grid-template-columns:1fr 1fr; gap:72px; align-items:center; }
.about-text h3 { font-size:30px; font-weight:800; margin-bottom:20px; color:var(--dark); letter-spacing:-0.02em; }
.about-text p { font-size:15px; color:var(--dark-600); margin-bottom:14px; line-height:1.8; }
.about-features { display:grid; grid-template-columns:1fr 1fr; gap:20px; margin-top:28px; }
.about-feature { display:flex; gap:14px; }
.about-feature-icon {
  width:44px; height:44px; background:var(--primary-lightest);
  border-radius:var(--r-sm); display:flex; align-items:center; justify-content:center;
  font-size:22px; flex-shrink:0;
}
.about-feature-text h4 { font-size:14px; font-weight:700; color:var(--dark); margin-bottom:2px; }
.about-feature-text p { font-size:12.5px; color:var(--dark-600); margin:0; }
.about-image-placeholder {
  width:100%; aspect-ratio:4/3;
  background:var(--grad-card); border:1px solid var(--gray-200);
  border-radius:var(--r-2xl); display:flex; align-items:center; justify-content:center;
  font-size:100px; box-shadow:var(--shadow-lg);
}

/* ===== Contact Section ===== */
.contact-section { background:var(--gray-100); position:relative; padding:80px 0; }
.contact-section .section-title { color:var(--dark); }
.contact-section .section-sub { color:var(--dark-600); }

/* ===== Contact Dark Section (contact.html专用) ===== */
.contact-dark-section {
  min-height:70vh; display:flex; align-items:center;
  background: var(--grad-hero);
  position:relative; overflow:hidden; padding:120px 0 100px;
}
.contact-dark-section::before {
  content:''; position:absolute; inset:0;
  background:
    radial-gradient(ellipse 50% 40% at 20% 20%, rgba(37,99,235,0.12) 0%, transparent 70%),
    radial-gradient(ellipse 40% 50% at 80% 60%, rgba(8,145,178,0.08) 0%, transparent 70%);
  pointer-events:none;
}
.contact-dark-section::after {
  content:''; position:absolute; inset:0;
  background-image:
    linear-gradient(rgba(59,130,246,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(59,130,246,0.03) 1px, transparent 1px);
  background-size:60px 60px;
  pointer-events:none;
}
.contact-dark-section .container {
  position:relative; z-index:1; text-align:center;
}
.contact-dark-header { margin-bottom:56px; }
.contact-dark-header h1 {
  font-size:48px; font-weight:800; color:#fff;
  letter-spacing:-0.03em; margin-bottom:16px;
}
.contact-dark-header h1 .hl {
  background:var(--grad-primary); -webkit-background-clip:text;
  -webkit-text-fill-color:transparent; background-clip:text;
}
.contact-dark-desc {
  font-size:17px; color:var(--gray-400); line-height:1.8;
}

/* Contact Dark Cards */
.contact-cards-dark {
  display:grid; grid-template-columns:repeat(4,1fr); gap:24px;
  max-width:1100px; margin:0 auto;
}
.contact-card-dark {
  background:rgba(255,255,255,0.04); border-radius:16px; padding:36px 28px;
  text-align:center;
  border:1px solid rgba(255,255,255,0.08);
  transition:all .3s cubic-bezier(.4,0,.2,1);
  position:relative;
  overflow:hidden;
  backdrop-filter:blur(8px);
}
.contact-card-dark::after {
  content:'';
  position:absolute; bottom:0; left:28px; right:28px;
  height:3px;
  background:var(--wb-gradient, linear-gradient(135deg, #3B82F6, #8B5CF6));
  border-radius:3px 3px 0 0;
  transform:scaleX(0);
  transform-origin:center;
  transition:transform .35s cubic-bezier(.4,0,.2,1);
}
.contact-card-dark:hover::after { transform:scaleX(1); }
.contact-card-dark:hover {
  transform:translateY(-6px);
  background:rgba(255,255,255,0.08);
  border-color:rgba(59,130,246,0.3);
  box-shadow:0 16px 48px rgba(37,99,235,.15);
}
.contact-card-dark-icon {
  width:60px; height:60px; margin:0 auto 20px;
  background:linear-gradient(135deg, rgba(37,99,235,0.2), rgba(139,92,246,0.15));
  border-radius:16px;
  display:flex; align-items:center; justify-content:center;
  color:var(--primary-lighter);
  transition:all .3s ease;
}
.contact-card-dark:hover .contact-card-dark-icon {
  background:linear-gradient(135deg, #2563eb, #7c3aed);
  color:#fff;
  transform:scale(1.05);
  box-shadow:0 8px 24px rgba(37,99,235,.25);
}
.contact-card-dark h4 { font-size:16px; color:rgba(255,255,255,0.9); margin-bottom:12px; font-weight:700; }
.contact-card-dark-value { font-size:16px; color:rgba(255,255,255,0.8); font-weight:700; margin-bottom:6px; line-height:1.5; }
.contact-card-dark-value a { color:rgba(255,255,255,0.8); text-decoration:none; transition:color .2s; }
.contact-card-dark-value a:hover { color:var(--primary-lighter); text-decoration:underline; }

/* ===== Contact Stats Section ===== */
.contact-stats-section {
  padding:72px 0;
  background:var(--white);
  border-top:1px solid var(--gray-200);
}
.contact-stats-grid {
  display:grid; grid-template-columns:repeat(4,1fr); gap:24px;
  max-width:900px; margin:0 auto;
}
.contact-stat-item {
  text-align:center; padding:32px 20px;
  border-radius:var(--r-lg);
  background:var(--gray-50);
  border:1px solid var(--gray-100);
  transition:all .3s ease;
}
.contact-stat-item:hover {
  background:var(--white);
  border-color:var(--primary-lightest);
  box-shadow:0 8px 32px rgba(37,99,235,.06);
  transform:translateY(-4px);
}
.contact-stat-num {
  margin-bottom:10px;
  line-height:1;
}
.contact-stat-digit {
  font-size:44px; font-weight:800;
  background:var(--grad-primary);
  -webkit-background-clip:text; -webkit-text-fill-color:transparent;
  background-clip:text;
}
.contact-stat-plus {
  font-size:28px; font-weight:700;
  color:var(--primary-lighter);
}
.contact-stat-label {
  font-size:14px; color:var(--dark-600); font-weight:500;
  letter-spacing:0.02em;
}
@media (max-width:1024px) {
  .contact-cards-dark { grid-template-columns:repeat(2,1fr); }
  .contact-stats-grid { grid-template-columns:repeat(2,1fr); }
}
@media (max-width:640px) {
  .contact-cards-dark { grid-template-columns:1fr; }
  .contact-dark-section { padding:100px 0 72px; }
  .contact-dark-header h1 { font-size:36px; }
  .contact-stats-grid { grid-template-columns:1fr; max-width:100%; }
}

/* Contact Cards */
.contact-cards {
  display:grid; grid-template-columns:repeat(4,1fr); gap:24px;
  max-width:1100px; margin:0 auto;
}
.contact-card {
  background:var(--white); border-radius:16px; padding:36px 28px;
  text-align:center; box-shadow:0 1px 3px rgba(0,0,0,.04);
  border:1px solid var(--gray-200);
  transition:all .3s cubic-bezier(.4,0,.2,1);
  position:relative;
  overflow:hidden;
}
.contact-card::after {
  content:'';
  position:absolute; bottom:0; left:28px; right:28px;
  height:3px;
  background:var(--wb-gradient, linear-gradient(135deg, #2563eb, #7c3aed));
  border-radius:3px 3px 0 0;
  transform:scaleX(0);
  transform-origin:center;
  transition:transform .35s cubic-bezier(.4,0,.2,1);
}
.contact-card:hover::after { transform:scaleX(1); }
.contact-card:hover {
  transform:translateY(-6px);
  box-shadow:0 16px 48px rgba(37,99,235,.1);
  border-color:var(--primary-lightest);
}
.contact-card-icon {
  width:60px; height:60px; margin:0 auto 20px;
  background:linear-gradient(135deg, #eff6ff, #f5f3ff);
  border-radius:16px;
  display:flex; align-items:center; justify-content:center;
  color:var(--primary, #2563eb);
  transition:all .3s ease;
}
.contact-card:hover .contact-card-icon {
  background:linear-gradient(135deg, #2563eb, #7c3aed);
  color:#fff;
  transform:scale(1.05);
  box-shadow:0 8px 24px rgba(37,99,235,.25);
}
.contact-card h4 { font-size:16px; color:var(--dark); margin-bottom:12px; font-weight:700; }
.contact-card-value { font-size:16px; color:var(--dark); font-weight:700; margin-bottom:6px; line-height:1.5; }
.contact-card-value a { color:var(--dark); text-decoration:none; transition:color .2s; }
.contact-card-value a:hover { color:var(--primary-dark); text-decoration:underline; }
.contact-card-note { font-size:13px; color:var(--gray-400); }

/* Quick Nav Cards */
.quick-nav-grid {
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:20px;
}
.quick-nav-card {
  display:flex;
  flex-direction:column;
  align-items:center;
  text-align:center;
  padding:40px 24px 32px;
  background:var(--white);
  border-radius:16px;
  border:1px solid var(--gray-200);
  text-decoration:none;
  transition:all .3s ease;
  position:relative;
  overflow:hidden;
}
.quick-nav-card:hover {
  transform:translateY(-4px);
  box-shadow:0 12px 40px rgba(37,99,235,0.12);
  border-color:var(--primary-lightest);
}
.quick-nav-icon { font-size:40px; margin-bottom:16px; }
.quick-nav-card h3 { font-size:18px; color:var(--dark); font-weight:700; margin-bottom:8px; }
.quick-nav-card p { font-size:13px; color:var(--gray-500); line-height:1.6; }
.quick-nav-arrow {
  position:absolute;
  right:20px;
  bottom:20px;
  font-size:20px;
  color:var(--primary-lighter);
  opacity:0;
  transform:translateX(-8px);
  transition:all .3s ease;
}
.quick-nav-card:hover .quick-nav-arrow {
  opacity:1;
  transform:translateX(0);
}

@media(max-width:1024px) {
  .quick-nav-grid { grid-template-columns:repeat(2,1fr); }
}
@media(max-width:768px) {
  .quick-nav-grid { grid-template-columns:1fr; }
  .quick-nav-card { padding:32px 20px 28px; }
}

/* ===== Footer ===== */
.footer {
  background:var(--gray-50); padding:48px 0 24px;
  border-top:1px solid var(--gray-200);
}
.footer-grid { 
  max-width:1000px; margin:0 auto 36px;
}
.footer-grid::after {
  content:''; display:block;
  width:100vw; margin-left:calc(-50vw + 50%);
  height:1px; background:var(--gray-200);
  margin-top:36px; margin-bottom:20px;
}
.footer-brand p { color:var(--dark-600); font-size:14px; line-height:1.8; max-width:33%; }
.footer-bottom {
  display:flex; justify-content:space-between;
  color:var(--dark-600); font-size:12.5px;
  max-width:1000px; margin:0 auto;
}
.footer-bottom a {
  color:var(--dark-600); text-decoration:none;
}
.footer-bottom a:hover { color:var(--primary); }
@media (max-width:768px) {
  .footer-bottom { flex-direction:column; gap:8px; align-items:center; }
}

/* ===== Product Hero (products.html) ===== */
.product-hero {
  padding:120px 0 72px; background:var(--grad-hero);
  position:relative; overflow:hidden;
}
.product-hero::before {
  content:''; position:absolute; inset:0;
  background:
    radial-gradient(ellipse 60% 40% at 30% 30%, rgba(37,99,235,0.1) 0%, transparent 70%),
    radial-gradient(ellipse 50% 40% at 70% 70%, rgba(8,145,178,0.06) 0%, transparent 70%);
  pointer-events:none;
}
.product-hero-content {
  display:grid; grid-template-columns:1fr 1fr; gap:56px; align-items:center;
  position:relative; z-index:1;
}
.breadcrumb { font-size:13px; color:var(--gray-400); margin-bottom:18px; }
.breadcrumb a { color:var(--primary-lighter); text-decoration:none; }
.breadcrumb a:hover { text-decoration:underline; }
.product-hero-text h1 { font-size:40px; font-weight:800; color:#fff; margin-bottom:18px; line-height:1.15; letter-spacing:-0.02em; }
.product-hero-text p { font-size:15px; color:var(--gray-400); line-height:1.8; margin-bottom:24px; }
.product-hero-image {
  display:flex; align-items:center; justify-content:center; min-height:280px;
}
.product-hero-image img { max-width:100%; max-height:380px; border-radius:var(--r-lg); }
.product-hero-image .placeholder {
  width:180px; height:180px; background:rgba(255,255,255,0.05);
  border:1px solid rgba(255,255,255,0.08); border-radius:var(--r-xl);
  display:flex; align-items:center; justify-content:center; font-size:72px;
}

/* ===== Gallery ===== */
.gallery-grid { display:flex; flex-wrap:wrap; justify-content:center; gap:16px; max-width:1120px; margin:0 auto; }
.gallery-item {
  border-radius:var(--r-lg); overflow:hidden; background:var(--white);
  border:1px solid var(--gray-200); 
  display:flex; flex-direction:column; align-items:center; justify-content:center;
  transition:var(--t); box-shadow:var(--shadow-xs); position:relative;
}
.gallery-item:hover { border-color:var(--primary-lighter); transform:scale(1.01); box-shadow:var(--shadow-md); }
.gallery-item img { width:100%; height:100%; object-fit:cover; display:block; }
.gallery-item .placeholder {
  display:flex; flex-direction:column; align-items:center; justify-content:center;
  gap:6px; font-size:40px; color:var(--gray-500);
}
.gallery-item .placeholder span { font-size:12px; color:var(--gray-500); }

/* Gallery item sizing */
.gallery-item { width:360px; height:650px; }

/* Gallery hero & label */
.gallery-hero { width:calc(360px * 2 + 16px); height:650px; }
.gallery-label {
  position:absolute; bottom:0; left:0; right:0;
  background:linear-gradient(transparent,rgba(0,0,0,0.7));
  color:white; font-size:13px; padding:24px 12px 8px; text-align:center;
  opacity:0; transition:opacity 0.3s;
}
.gallery-item:hover .gallery-label { opacity:1; }

/* Gallery responsive */
@media (max-width:768px) {
  .gallery-grid { gap:10px; }
  .gallery-item { width:calc(50% - 5px); height:auto; }
  .gallery-hero { width:100%; height:auto; }
}
@media (max-width:480px) {
  .gallery-item { width:100%; max-width:360px; height:auto; }
  .gallery-hero { width:100%; height:auto; }
}


/* ===== Product Show Grid (Homepage) ===== */
.product-show-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  max-width: 1100px;
  margin: 0 auto;
}
.product-show-card {
  background: var(--white);
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--gray-200);
  transition: var(--t);
  cursor: pointer;
}
.product-show-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary-lighter);
}
.product-show-img {
  width: 100%;
  aspect-ratio: 1 / 1;
  background: var(--gray-100);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
.product-show-img img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  padding: 12px;
  transition: transform 0.4s;
}
.product-show-card:hover .product-show-img img {
  transform: scale(1.05);
}
.product-show-name {
  text-align: center;
  padding: 12px 8px;
  font-size: 14px;
  font-weight: 600;
  color: var(--dark-700);
}

@media (max-width: 900px) {
  .product-show-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
}
@media (max-width: 480px) {
  .product-show-grid { grid-template-columns: repeat(2, 1fr); gap: 8px; }
  .product-show-name { font-size: 12px; padding: 8px 4px; }
}


/* ===== Specs Table ===== */
.specs-table {
  width:100%; border-collapse:collapse;
  border-radius:var(--r-lg); overflow:hidden;
  border:1px solid var(--gray-200);
}
.specs-table th {
  background:var(--gray-100); color:var(--dark-600);
  font-weight:600; padding:13px 20px; text-align:left;
  width:35%; font-size:14px; border-bottom:1px solid var(--gray-200);
}
.specs-table td {
  padding:13px 20px; color:var(--dark-700); font-size:14px;
  border-bottom:1px solid var(--gray-100); background:var(--white);
}
.specs-table tbody tr:last-child th,
.specs-table tbody tr:last-child td { border-bottom:none; }
.specs-table tbody tr:hover td { background:var(--gray-50); }

/* ===== Animations ===== */
.fade-in { opacity:0; transform:translateY(20px); }
.fade-in.visible { opacity:1; transform:translateY(0); }

/* ===== Particles ===== */
.particles-bg { position:absolute; inset:0; overflow:hidden; pointer-events:none; }
.particle {
  position:absolute; width:2px; height:2px;
  background:rgba(147,197,253,0.4); border-radius:50%;
  animation:particleFloat linear infinite both;
}
@keyframes particleFloat {
  0% { transform:translateY(100vh) scale(0); opacity:0; }
  10% { opacity:1; }
  90% { opacity:1; }
  100% { transform:translateY(-10vh) scale(1); opacity:0; }
}



/* ===== Dropdown Navigation ===== */
.nav-dropdown {
  position: relative;
}
.nav-dropdown-toggle {
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 2px;
}
.nav-dropdown-menu {
  position: absolute;
  top: calc(100% + 12px);
  left: 50%;
  transform: translateX(-50%);
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 12px 40px rgba(0,0,0,0.12), 0 2px 8px rgba(0,0,0,0.06);
  padding: 8px;
  min-width: 180px;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.2s, visibility 0.2s, transform 0.2s;
  transform: translateX(-50%) translateY(-4px);
  z-index: 1001;
}
.nav-dropdown:hover .nav-dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}
.nav-dropdown-menu a {
  display: block;
  padding: 10px 16px;
  border-radius: 6px;
  color: var(--dark-600) !important;
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  transition: background 0.15s, color 0.15s;
  white-space: nowrap;
}
.nav-dropdown-menu a:hover {
  background: rgba(37,99,235,0.06);
  color: var(--primary) !important;
}
.nav-dropdown-menu a::after { display: none !important; }
.nav-dropdown-toggle::after { display: none !important; }

/* Wide multi-column dropdown for products */
.nav-dropdown-wide {
  min-width: 480px;
  padding: 12px 8px;
  display: flex;
  gap: 0;
}
.dropdown-category {
  flex: 1;
  padding: 0 8px;
}
.dropdown-category + .dropdown-category {
  border-left: 1px solid var(--gray-200);
}
.dropdown-cat-title {
  font-size: 11px;
  font-weight: 700;
  color: var(--gray-400);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: 6px 16px 10px;
  white-space: nowrap;
}
.nav-dropdown-wide .dropdown-category a {
  font-size: 13px;
  padding: 7px 16px;
}
.nav-dropdown-wide .dropdown-disabled {
  color: var(--gray-400) !important;
  cursor: default;
  pointer-events: none;
}

@media (max-width: 768px) {
  .nav-dropdown-wide {
    min-width: auto;
    flex-direction: column;
  }
  .dropdown-category + .dropdown-category {
    border-left: none;
    border-top: 1px solid var(--gray-200);
    padding-top: 4px;
    margin-top: 4px;
  }
}

/* ===== Product Overview Cards ===== */
.product-cards-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
  max-width: 1200px;
  margin: 0 auto;
}
.product-overview-card {
  background: #fff;
  border-radius: 14px;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  text-decoration: none;
  display: flex;
  flex-direction: column;
  cursor: pointer;
  height: 100%;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  will-change: transform;
}
.product-overview-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 40px rgba(0,0,0,0.12);
}
.product-card-img {
  width: 100%;
  flex: 1;
  min-height: 160px;
  background: var(--gray-50);
  display: flex;
  align-items: flex-end;
  justify-content: center;
  overflow: hidden;
}
.product-card-img img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: bottom;
  padding: 12px;
}
.card-placeholder {
  font-size: 48px;
}
.product-card-body {
  padding: 12px 16px;
  display: flex;
  flex-direction: column;
  min-height: 62px;
  justify-content: center;
}
.product-card-tag {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 20px;
  font-size: 11px;
  font-weight: 600;
  margin-bottom: 8px;
  width: fit-content;
}
.product-card-body h3 {
  font-size: 16px;
  font-weight: 700;
  color: var(--dark-800);
  margin: 0 0 4px 0;
}
.product-card-model {
  font-size: 13px;
  color: var(--dark-400);
  margin: 0 0 12px 0;
  font-family: monospace;
}
.product-card-desc {
  font-size: 14px;
  color: var(--dark-500);
  line-height: 1.6;
  margin: 0 0 16px 0;
  flex: 1;
}
.product-card-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--primary);
  margin-top: auto;
}

@media (max-width: 768px) {
  .product-cards-grid {
    grid-template-columns: 1fr;
    max-width: 100%;
  }
}

/* ===== Responsive - 保持桌面端布局 ===== */
/* 已禁用响应式布局，手机端也显示完整的多列布局 */