/* ============================================================
   淄博气宇空调 — 升级版样式表
   Premium Industrial Tech Design System
   ============================================================ */

/* ---------- CSS 变量 & 主题 ---------- */
:root {
  /* 主色系 */
  --primary: #00b4d8;
  --primary-dark: #0077b6;
  --primary-light: #90e0ef;
  --accent: #48cae4;
  --accent-glow: rgba(0, 180, 216, 0.3);

  /* 暗色主题（默认） */
  --bg-base: #050d1a;
  --bg-surface: #0a1628;
  --bg-card: #0f2040;
  --bg-card-hover: #142855;
  --bg-glass: rgba(15, 32, 64, 0.7);
  --bg-glass-border: rgba(0, 180, 216, 0.15);

  --text-primary: #e8f4fd;
  --text-secondary: #8badc8;
  --text-muted: #4a7090;
  --text-heading: #ffffff;

  --border-color: rgba(0, 180, 216, 0.12);
  --border-hover: rgba(0, 180, 216, 0.35);

  --shadow-sm: 0 2px 8px rgba(0,0,0,0.3);
  --shadow-md: 0 8px 32px rgba(0,0,0,0.4);
  --shadow-lg: 0 24px 64px rgba(0,0,0,0.5);
  --shadow-glow: 0 0 30px rgba(0, 180, 216, 0.2);

  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;

  --transition: 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-fast: 0.15s ease;

  --nav-height: 70px;
}

[data-theme="light"] {
  --bg-base: #f0f6ff;
  --bg-surface: #ffffff;
  --bg-card: #ffffff;
  --bg-card-hover: #f5faff;
  --bg-glass: rgba(255, 255, 255, 0.85);
  --bg-glass-border: rgba(0, 119, 182, 0.15);

  --text-primary: #1a2e44;
  --text-secondary: #4a6a8a;
  --text-muted: #8badc8;
  --text-heading: #0a1628;

  --border-color: rgba(0, 119, 182, 0.1);
  --border-hover: rgba(0, 119, 182, 0.3);

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 8px 32px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 24px 64px rgba(0, 0, 0, 0.12);
  --shadow-glow: 0 0 30px rgba(0, 119, 182, 0.15);
}

/* ---------- 全局重置 ---------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg-base);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  transition: background 0.4s ease, color 0.4s ease;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

img { max-width: 100%; height: auto; display: block; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }
input, select, textarea { font-family: inherit; font-size: 1rem; }

.container {
  max-width: 1260px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- 粒子画布 ---------- */
#particles-canvas {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  pointer-events: none;
  z-index: 0;
  opacity: 0.4;
}

/* ---------- 顶部工具条 ---------- */
.top-bar {
  position: relative;
  z-index: 100;
  background: rgba(5, 13, 26, 0.95);
  border-bottom: 1px solid var(--border-color);
  padding: 8px 0;
  font-size: 0.82rem;
  color: var(--text-secondary);
}

[data-theme="light"] .top-bar {
  background: rgba(240, 246, 255, 0.95);
}

.top-bar .container {
  display: flex;
  align-items: center;
  gap: 12px;
}

.top-bar .divider { opacity: 0.3; }

.top-bar-right {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 16px;
}

.top-link {
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}
.top-link:hover { color: var(--primary); }

/* 主题切换按钮 */
.theme-toggle {
  width: 32px; height: 32px;
  border-radius: 50%;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  display: flex; align-items: center; justify-content: center;
  font-size: 14px;
  transition: all var(--transition-fast);
  cursor: pointer;
}
.theme-toggle:hover {
  border-color: var(--primary);
  box-shadow: 0 0 12px var(--accent-glow);
  transform: scale(1.1);
}

/* ---------- 主导航 ---------- */
.main-header {
  position: sticky;
  top: 0;
  z-index: 99;
  background: var(--bg-glass);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--bg-glass-border);
  transition: all var(--transition);
}

.main-header.scrolled {
  box-shadow: var(--shadow-md);
}

.nav-container {
  display: flex;
  align-items: center;
  height: var(--nav-height);
  gap: 32px;
}

/* Logo */
.logo {
  display: flex; align-items: center; gap: 12px;
  color: var(--text-heading);
  flex-shrink: 0;
}

.logo-icon {
  width: 40px; height: 40px;
  color: var(--primary);
  transition: transform var(--transition);
}
.logo:hover .logo-icon { transform: rotate(15deg); }

.logo-text {
  display: flex; flex-direction: column; line-height: 1.2;
}
.logo-cn {
  font-size: 1.15rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.logo-sub {
  font-size: 0.68rem;
  color: var(--text-secondary);
  font-weight: 300;
}

/* 导航链接 */
.main-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: auto;
}

.nav-link {
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
  position: relative;
  display: flex; align-items: center; gap: 4px;
}

.nav-link:hover, .nav-link.active {
  color: var(--primary);
  background: rgba(0, 180, 216, 0.08);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 2px; left: 50%;
  transform: translateX(-50%);
  width: 16px; height: 2px;
  background: var(--primary);
  border-radius: 99px;
}

.arrow-icon {
  width: 8px; height: 6px;
  transition: transform var(--transition-fast);
  fill: currentColor;
}

/* 下拉菜单 */
.nav-dropdown {
  position: relative;
}

.nav-dropdown:hover .dropdown-menu { opacity: 1; visibility: visible; transform: translateY(0); }
.nav-dropdown:hover .arrow-icon { transform: rotate(180deg); }

.dropdown-menu {
  position: absolute;
  top: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%) translateY(-8px);
  min-width: 180px;
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--radius-md);
  padding: 8px;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition);
  box-shadow: var(--shadow-md);
  z-index: 200;
}

.dropdown-item {
  display: block;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}
.dropdown-item:hover {
  color: var(--primary);
  background: rgba(0, 180, 216, 0.08);
  transform: translateX(4px);
}

/* 移动汉堡菜单 */
.mobile-menu-btn {
  display: none;
  flex-direction: column; gap: 5px;
  padding: 8px;
  margin-left: auto;
}
.mobile-menu-btn span {
  display: block;
  width: 24px; height: 2px;
  background: var(--text-secondary);
  border-radius: 2px;
  transition: all var(--transition);
}

/* ---------- 英雄区 ---------- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex; align-items: center;
  overflow: hidden;
  padding: calc(var(--nav-height) + 60px) 0 80px;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-gradient {
  position: absolute; inset: 0;
  background: radial-gradient(ellipse 80% 60% at 30% 40%,
    rgba(0, 77, 120, 0.5) 0%,
    rgba(0, 180, 216, 0.15) 40%,
    transparent 70%),
    radial-gradient(ellipse 50% 50% at 80% 80%,
    rgba(72, 202, 228, 0.1) 0%,
    transparent 60%);
}

.hero-grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(0, 180, 216, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 180, 216, 0.04) 1px, transparent 1px);
  background-size: 50px 50px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 50%, black 0%, transparent 70%);
}

.hero-content {
  position: relative; z-index: 1;
  max-width: 760px;
}

.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 16px;
  background: rgba(0, 180, 216, 0.08);
  border: 1px solid rgba(0, 180, 216, 0.2);
  border-radius: 99px;
  font-size: 0.82rem;
  color: var(--primary-light);
  margin-bottom: 24px;
}

.badge-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--primary);
  box-shadow: 0 0 8px var(--primary);
  animation: pulse-dot 2s infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.3); }
}

.hero-title {
  font-size: clamp(2.4rem, 6vw, 4.2rem);
  font-weight: 900;
  line-height: 1.15;
  color: var(--text-heading);
  margin-bottom: 24px;
  letter-spacing: -0.02em;
}

.gradient-text {
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 50%, #a8edea 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  background-size: 200% 200%;
  animation: gradient-shift 4s ease infinite;
}

@keyframes gradient-shift {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

.hero-desc {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: 40px;
  line-height: 1.8;
}

/* 按钮系统 */
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 60px; }

.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 14px 28px;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-weight: 600;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
  cursor: pointer;
  text-decoration: none;
}

.btn::before {
  content: '';
  position: absolute; inset: 0;
  background: rgba(255,255,255,0.1);
  opacity: 0;
  transition: opacity var(--transition-fast);
}
.btn:hover::before { opacity: 1; }

.btn-primary {
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
  color: #fff;
  box-shadow: 0 4px 24px rgba(0, 180, 216, 0.35);
}
.btn-primary:hover {
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 8px 32px rgba(0, 180, 216, 0.5);
}

.btn-ghost {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-hover);
}
.btn-ghost:hover {
  background: rgba(0, 180, 216, 0.08);
  border-color: var(--primary);
  color: var(--primary);
  transform: translateY(-2px);
}

.btn-outline {
  background: transparent;
  color: var(--primary);
  border: 1.5px solid var(--primary);
  padding: 12px 28px;
}
.btn-outline:hover {
  background: rgba(0, 180, 216, 0.08);
  transform: translateY(-2px);
  box-shadow: 0 4px 20px rgba(0, 180, 216, 0.2);
}

.full-width { width: 100%; justify-content: center; }

.btn-arrow {
  width: 18px; height: 18px;
  transition: transform var(--transition-fast);
}
.btn:hover .btn-arrow { transform: translateX(4px); }

/* 统计数字 */
.hero-stats {
  display: flex;
  align-items: center;
  gap: 32px;
}

.stat-item {
  display: flex; flex-direction: column;
  align-items: flex-start;
}

.stat-num {
  font-size: 2.2rem;
  font-weight: 900;
  color: var(--text-heading);
  line-height: 1;
  display: inline;
}
.stat-unit {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--primary);
}
.stat-label {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 4px;
}

.stat-divider {
  width: 1px; height: 40px;
  background: var(--border-color);
}

/* 滚动提示 */
.scroll-hint {
  position: absolute;
  bottom: 40px; left: 50%;
  transform: translateX(-50%);
  display: flex; flex-direction: column;
  align-items: center; gap: 8px;
  z-index: 1;
}

.scroll-text {
  font-size: 0.72rem;
  letter-spacing: 0.15em;
  color: var(--text-muted);
  text-transform: uppercase;
}

.scroll-line {
  width: 1px; height: 40px;
  background: linear-gradient(to bottom, var(--primary), transparent);
  animation: scroll-line 2s ease infinite;
}

@keyframes scroll-line {
  0% { transform: scaleY(0); transform-origin: top; }
  50% { transform: scaleY(1); transform-origin: top; }
  51% { transform: scaleY(1); transform-origin: bottom; }
  100% { transform: scaleY(0); transform-origin: bottom; }
}

/* ---------- 通用节区 ---------- */
.section {
  position: relative;
  padding: 100px 0;
  z-index: 1;
}

.section-header {
  text-align: center;
  margin-bottom: 60px;
}

.section-tag {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--primary);
  text-transform: uppercase;
  margin-bottom: 12px;
  opacity: 0.8;
}

.section-title {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 800;
  color: var(--text-heading);
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.section-desc {
  font-size: 1rem;
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto;
}

/* ---------- 产品部分 ---------- */
.products-section {
  background: linear-gradient(180deg, transparent 0%, rgba(0, 20, 40, 0.5) 50%, transparent 100%);
}

/* 产品 Tab */
.product-tabs {
  display: flex;
  justify-content: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}

.tab-btn {
  padding: 8px 20px;
  border-radius: 99px;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.tab-btn:hover {
  color: var(--primary);
  border-color: var(--border-hover);
}

.tab-btn.active {
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
  color: #fff;
  border-color: transparent;
  box-shadow: 0 4px 16px rgba(0, 180, 216, 0.3);
}

/* 产品网格 */
.products-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

/* 产品卡片 */
.product-card {
  transition: transform var(--transition), opacity var(--transition);
}

.product-card.hidden {
  display: none;
}

.product-card-inner {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition);
  height: 100%;
  display: flex; flex-direction: column;
}

.product-card-inner:hover {
  border-color: var(--border-hover);
  transform: translateY(-6px);
  box-shadow: var(--shadow-glow), var(--shadow-lg);
}

.product-image-wrapper {
  position: relative;
  padding-top: 66%;
  overflow: hidden;
  background: var(--bg-surface);
}

.product-image-wrapper img {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform 0.5s var(--transition);
}

/* SVG产品图：完整显示矢量图，加深背景 */
.product-image-wrapper img[src$=".svg"] {
  object-fit: contain;
  background: linear-gradient(135deg, #0a0e1a 0%, #0d1b2a 100%);
  padding: 8px;
}

.product-card-inner:hover .product-image-wrapper img {
  transform: scale(1.06);
}

.product-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 20, 40, 0.7);
  backdrop-filter: blur(4px);
  display: flex; align-items: center; justify-content: center;
  opacity: 0;
  transition: opacity var(--transition);
}

.product-card-inner:hover .product-overlay { opacity: 1; }

.product-detail-btn {
  padding: 10px 20px;
  background: var(--primary);
  color: #fff;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  font-weight: 600;
  transition: all var(--transition-fast);
  transform: translateY(8px);
}

.product-card-inner:hover .product-detail-btn { transform: translateY(0); }
.product-detail-btn:hover { background: var(--primary-dark); }

.product-badge {
  position: absolute;
  top: 12px; right: 12px;
  padding: 4px 10px;
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
  color: #fff;
  border-radius: 99px;
  font-size: 0.72rem;
  font-weight: 700;
}

.new-badge {
  background: linear-gradient(135deg, #f77f00, #d62828);
}

.product-info {
  padding: 20px;
  flex: 1;
  display: flex; flex-direction: column; gap: 8px;
}

.product-category-tag {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.product-name {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-heading);
  line-height: 1.4;
}

.product-desc {
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.6;
  flex: 1;
}

.product-footer { margin-top: 8px; }

.product-link {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--primary);
  display: inline-flex; align-items: center; gap: 4px;
  transition: gap var(--transition-fast);
}

.product-link:hover { gap: 8px; }

.link-arrow {
  display: inline-block;
  transition: transform var(--transition-fast);
}
.product-link:hover .link-arrow { transform: translateX(4px); }

.products-more {
  text-align: center;
  margin-top: 48px;
}

/* ---------- 核心优势 ---------- */
.advantages-section {
  overflow: hidden;
}

.advantages-bg {
  position: absolute; inset: 0;
  pointer-events: none;
}

.adv-blur-1, .adv-blur-2 {
  position: absolute;
  width: 600px; height: 600px;
  border-radius: 50%;
  filter: blur(120px);
  opacity: 0.06;
}

.adv-blur-1 {
  background: var(--primary);
  top: -200px; left: -200px;
}

.adv-blur-2 {
  background: var(--accent);
  bottom: -200px; right: -200px;
}

.advantages-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.adv-card {
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.adv-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--primary), transparent);
  opacity: 0;
  transition: opacity var(--transition);
}

.adv-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-6px);
  box-shadow: var(--shadow-glow);
}

.adv-card:hover::before { opacity: 1; }

.adv-icon-wrapper {
  position: relative;
  width: 56px; height: 56px;
  margin-bottom: 20px;
}

.adv-icon-bg {
  position: absolute; inset: 0;
  background: rgba(0, 180, 216, 0.1);
  border-radius: var(--radius-sm);
  border: 1px solid rgba(0, 180, 216, 0.15);
  transition: all var(--transition);
}

.adv-card:hover .adv-icon-bg {
  background: rgba(0, 180, 216, 0.18);
  border-color: rgba(0, 180, 216, 0.35);
}

.adv-icon {
  position: absolute; inset: 0;
  width: 56px; height: 56px;
  padding: 14px;
  color: var(--primary);
}

.adv-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-heading);
  margin-bottom: 12px;
}

.adv-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 16px;
}

.adv-tag-list {
  display: flex; gap: 8px; flex-wrap: wrap;
}

.adv-tag {
  padding: 3px 10px;
  background: rgba(0, 180, 216, 0.08);
  border: 1px solid rgba(0, 180, 216, 0.15);
  border-radius: 99px;
  font-size: 0.72rem;
  color: var(--primary-light);
}

/* ---------- 数据指标 ---------- */
.metrics-section {
  padding: 60px 0;
  background: var(--bg-glass);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.metrics-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 40px;
}

.metric-item {
  text-align: center;
}

.metric-value {
  font-size: 2.8rem;
  font-weight: 900;
  color: var(--text-heading);
  line-height: 1;
  margin-bottom: 8px;
  background: linear-gradient(135deg, var(--text-heading), var(--primary-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.metric-label {
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

.metric-bar {
  height: 4px;
  background: var(--bg-card);
  border-radius: 99px;
  overflow: hidden;
}

.metric-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary-dark), var(--primary), var(--accent));
  border-radius: 99px;
  width: 0;
  transition: width 1.5s cubic-bezier(0.16, 1, 0.3, 1);
}

/* ---------- 应用场景 ---------- */
.scenarios-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-template-rows: repeat(2, 200px);
  gap: 16px;
}

.scenario-card.large {
  grid-column: span 2;
  grid-row: span 2;
}

.scenario-inner {
  height: 100%;
  border-radius: var(--radius-lg);
  overflow: hidden;
  position: relative;
  cursor: pointer;
  transition: transform var(--transition);
}

.scenario-inner:hover { transform: scale(0.98); }
.scenario-inner::after {
  content: '';
  position: absolute; inset: 0;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(255,255,255,0.1);
}

.scenario-content {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  padding: 24px;
  background: linear-gradient(transparent, rgba(0,0,0,0.6));
}

.scenario-icon {
  font-size: 2rem;
  margin-bottom: 8px;
  display: block;
}

.scenario-content h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 6px;
}

.scenario-content p {
  font-size: 0.82rem;
  color: rgba(255,255,255,0.75);
  line-height: 1.5;
}

/* ---------- 联系区 ---------- */
.contact-section {
  background: linear-gradient(180deg, transparent, rgba(0, 20, 40, 0.3) 50%, transparent);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 40px;
  align-items: start;
}

.contact-info {
  display: flex; flex-direction: column; gap: 20px;
}

.contact-item {
  display: flex; align-items: center; gap: 16px;
  padding: 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.contact-item:hover {
  border-color: var(--border-hover);
  transform: translateX(4px);
}

.contact-icon { font-size: 1.5rem; }

.contact-label {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.contact-value {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-heading);
}

.qq-chat-link {
  color: var(--primary);
  border-bottom: 1px dashed var(--primary);
  padding-bottom: 1px;
}

/* 询价表单 */
.contact-form-card {
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--radius-lg);
  padding: 36px;
}

.form-title {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-heading);
  margin-bottom: 24px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.form-group {
  display: flex; flex-direction: column; gap: 8px;
  margin-bottom: 16px;
}

.form-group label {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 12px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.9rem;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  outline: none;
  resize: none;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(0, 180, 216, 0.12);
}

.form-group select option { background: var(--bg-card); }

/* ---------- 友情链接 ---------- */
.links-section {
  padding: 28px 0;
  border-top: 1px solid var(--border-color);
  background: var(--bg-glass);
}

.links-header {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-muted);
  display: inline-block;
  margin-right: 20px;
}

.links-section .container {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.friend-link {
  font-size: 0.82rem;
  color: var(--text-secondary);
  padding: 4px 12px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 99px;
  transition: all var(--transition-fast);
}

.friend-link:hover {
  color: var(--primary);
  border-color: var(--border-hover);
}

/* ---------- 页脚 ---------- */
.main-footer {
  background: var(--bg-surface);
  border-top: 1px solid var(--border-color);
  padding-top: 60px;
}

.footer-container {
  display: grid;
  grid-template-columns: 1.5fr 2fr;
  gap: 60px;
  padding-bottom: 48px;
}

.footer-logo {
  display: flex; align-items: center; gap: 12px;
  margin-bottom: 16px;
  color: var(--text-heading);
  font-size: 1rem;
  font-weight: 600;
}

.footer-logo svg { width: 36px; height: 36px; color: var(--primary); }

.footer-slogan {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.footer-col {
  display: flex; flex-direction: column; gap: 10px;
}

.footer-col h4 {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.footer-col a,
.footer-col span {
  font-size: 0.82rem;
  color: var(--text-muted);
  transition: color var(--transition-fast);
}

.footer-col a:hover { color: var(--primary); }

.footer-bottom {
  border-top: 1px solid var(--border-color);
  padding: 20px 0;
}

.footer-bottom .container {
  display: flex; align-items: center;
  font-size: 0.78rem;
  color: var(--text-muted);
  gap: 12px;
}

.footer-bottom a:hover { color: var(--primary); }
.footer-divider { opacity: 0.3; }

/* ---------- 悬浮操作 ---------- */
.float-actions {
  position: fixed;
  right: 24px; bottom: 40px;
  display: flex; flex-direction: column;
  gap: 12px;
  z-index: 1000;
}

.float-btn {
  width: 48px; height: 48px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
  transition: all var(--transition);
  box-shadow: var(--shadow-md);
  text-decoration: none;
}

.float-btn svg { width: 20px; height: 20px; }

.float-qq {
  background: linear-gradient(135deg, #1aad19, #2fc82f);
  color: #fff;
}

.float-phone {
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
  color: #fff;
}

.float-top {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  opacity: 0;
  pointer-events: none;
  transform: translateY(10px);
}

.float-btn:hover { transform: scale(1.1) translateY(-2px); }
.float-top.visible { opacity: 1; pointer-events: all; transform: translateY(0); }

/* ---------- 动画类 ---------- */
.animate-fade-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s var(--transition), transform 0.7s var(--transition);
}

.animate-fade-up.in-view {
  opacity: 1;
  transform: translateY(0);
}

.delay-1 { transition-delay: 0.1s !important; }
.delay-2 { transition-delay: 0.2s !important; }
.delay-3 { transition-delay: 0.3s !important; }
.delay-4 { transition-delay: 0.4s !important; }
.delay-5 { transition-delay: 0.5s !important; }

/* 滚动动画 */
[data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

[data-reveal].revealed {
  opacity: 1;
  transform: none;
}

/* ---------- 响应式 ---------- */
@media (max-width: 1100px) {
  .products-grid { grid-template-columns: repeat(3, 1fr); }
  .advantages-grid { grid-template-columns: repeat(2, 1fr); }
  .metrics-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 900px) {
  .products-grid { grid-template-columns: repeat(2, 1fr); }
  .scenarios-grid { grid-template-columns: 1fr 1fr; }
  .scenario-card.large { grid-column: span 2; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-container { grid-template-columns: 1fr; gap: 32px; }
  .footer-links { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 768px) {
  .section { padding: 64px 0; }
  .hero { min-height: auto; padding: 120px 0 80px; }
  .hero-stats { gap: 20px; }

  .main-nav { display: none; position: fixed; inset: 0; flex-direction: column;
    background: var(--bg-glass); backdrop-filter: blur(30px);
    justify-content: center; align-items: center; gap: 16px; z-index: 200; }
  .main-nav.open { display: flex; }
  .nav-link { font-size: 1.2rem; padding: 12px 24px; }
  .mobile-menu-btn { display: flex; }

  .products-grid { grid-template-columns: 1fr 1fr; }
  .advantages-grid { grid-template-columns: 1fr; }
  .metrics-grid { grid-template-columns: 1fr 1fr; gap: 24px; }
  .scenarios-grid { grid-template-columns: 1fr; grid-template-rows: auto; }
  .scenario-card.large { grid-column: span 1; }
  .form-row { grid-template-columns: 1fr; }
  .footer-links { grid-template-columns: 1fr 1fr; }
  .hero-actions { gap: 12px; }
}

@media (max-width: 480px) {
  .products-grid { grid-template-columns: 1fr; }
  .footer-links { grid-template-columns: 1fr; }
  .hero-stats { flex-direction: column; gap: 16px; align-items: flex-start; }
  .stat-divider { display: none; }
}

/* ---------- 磁性效果类 ---------- */
.magnetic { will-change: transform; }

/* ---------- 光标效果 ---------- */
.cursor-glow {
  position: fixed;
  width: 300px; height: 300px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(0, 180, 216, 0.04) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
  transform: translate(-50%, -50%);
  transition: transform 0.15s ease;
}