/* Tailwind CSS CDN */
@import url('https://cdn.jsdelivr.net/npm/tailwindcss@2.2.19/dist/tailwind.min.css');

/* ============================================================
   淄博气宇空调节能设备有限公司 - 烟气消白脱白系统
   全局 CSS 变量 & 自定义样式
   ============================================================ */

:root {
  /* 主色系 - 科技蓝 */
  --color-primary:       #0a5eb0;
  --color-primary-light: #1a7fd4;
  --color-primary-pale:  #3b9fef;
  --color-primary-dark:  #0d3a6e;

  /* 背景色 */
  --color-bg-dark:       #0a1628;
  --color-bg-darker:     #060f1e;
  --color-bg-card:       #0d1f35;
  --color-bg-card2:      #0f2744;
  --color-bg-light:      #f8fafc;

  /* 文字色 */
  --color-text-white:    #ffffff;
  --color-text-muted:    #94a3b8;
  --color-text-dark:     #1e293b;
  --color-text-darker:   #0f172a;

  /* 功能色 */
  --color-success:       #10b981;
  --color-warning:       #f59e0b;
  --color-danger:        #ef4444;
  --color-info:          #3b82f6;

  /* 描边/发光 */
  --color-border:        rgba(26, 127, 212, 0.25);
  --color-glow:          rgba(26, 127, 212, 0.6);

  /* 字体 */
  --font-primary: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;

  /* 过渡 */
  --transition-base: 0.3s ease;
  --transition-slow: 0.6s ease;
}

/* ============================================================
   全局重置 & 基础
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-primary);
  background-color: var(--color-bg-dark);
  color: var(--color-text-white);
  line-height: 1.7;
  overflow-x: hidden;
}

a { text-decoration: none; color: inherit; transition: color var(--transition-base); }
img { max-width: 100%; height: auto; }
ul { list-style: none; padding: 0; margin: 0; }

/* ============================================================
   滚动条美化
   ============================================================ */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--color-bg-dark); }
::-webkit-scrollbar-thumb { background: var(--color-primary); border-radius: 3px; }

/* ============================================================
   导航栏
   ============================================================ */
#navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  transition: background var(--transition-base), box-shadow var(--transition-base);
  background: transparent;
}
#navbar.scrolled {
  background: rgba(6, 15, 30, 0.97);
  box-shadow: 0 2px 20px rgba(10, 94, 176, 0.3);
  backdrop-filter: blur(12px);
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
}
.nav-logo-icon {
  width: 40px; height: 40px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-pale));
  border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
}
.nav-logo-text { font-size: 18px; font-weight: 700; letter-spacing: 0.02em; }
.nav-logo-sub { font-size: 11px; color: var(--color-text-muted); letter-spacing: 0.05em; }

.nav-menu { display: flex; align-items: center; gap: 4px; }
.nav-item {
  position: relative;
}
.nav-link {
  display: block;
  padding: 8px 14px;
  font-size: 14px;
  font-weight: 500;
  color: rgba(255,255,255,0.85);
  border-radius: 6px;
  transition: all var(--transition-base);
  white-space: nowrap;
}
.nav-link:hover, .nav-link.active {
  color: #fff;
  background: rgba(26, 127, 212, 0.2);
}
.nav-link.active {
  border-bottom: 2px solid var(--color-primary-light);
}

/* 下拉菜单 */
.nav-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  min-width: 180px;
  background: rgba(10, 22, 40, 0.98);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 8px 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: all var(--transition-base);
  box-shadow: 0 10px 40px rgba(0,0,0,0.5);
  backdrop-filter: blur(10px);
}
.nav-item:hover .nav-dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.nav-dropdown a {
  display: block;
  padding: 9px 18px;
  font-size: 13px;
  color: var(--color-text-muted);
  transition: all var(--transition-base);
}
.nav-dropdown a:hover {
  color: #fff;
  background: rgba(26, 127, 212, 0.15);
  padding-left: 24px;
}

/* 电话号码 */
.nav-phone {
  display: flex; align-items: center; gap: 6px;
  font-size: 14px; font-weight: 600;
  color: var(--color-primary-pale);
  padding: 6px 14px;
  border: 1px solid rgba(59, 159, 239, 0.35);
  border-radius: 20px;
  transition: all var(--transition-base);
}
.nav-phone:hover {
  background: rgba(59, 159, 239, 0.15);
  border-color: var(--color-primary-pale);
  box-shadow: 0 0 12px var(--color-glow);
}

/* 汉堡菜单 */
.hamburger { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 4px; }
.hamburger span {
  width: 24px; height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: all var(--transition-base);
  display: block;
}
.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* 移动菜单 */
.mobile-menu {
  display: none;
  position: fixed;
  top: 70px; left: 0; right: 0;
  background: rgba(6, 15, 30, 0.98);
  border-bottom: 1px solid var(--color-border);
  padding: 16px 20px 24px;
  z-index: 999;
  backdrop-filter: blur(12px);
}
.mobile-menu.open { display: block; }
.mobile-menu a {
  display: block;
  padding: 12px 8px;
  font-size: 15px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
  color: rgba(255,255,255,0.8);
}
.mobile-menu a:hover { color: var(--color-primary-pale); }

/* ============================================================
   Hero 横幅
   ============================================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex; align-items: center; justify-content: center;
  overflow: hidden;
}
.hero-bg {
  position: absolute; inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 50% 0%, rgba(10, 94, 176, 0.35) 0%, transparent 70%),
    radial-gradient(ellipse 60% 40% at 80% 80%, rgba(26, 127, 212, 0.2) 0%, transparent 60%),
    linear-gradient(180deg, var(--color-bg-darker) 0%, var(--color-bg-dark) 100%);
}
.hero-grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(26, 127, 212, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(26, 127, 212, 0.07) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 80% 80% at center, black 40%, transparent 100%);
}
/* 粒子画布 */
#particles-canvas {
  position: absolute; inset: 0;
  pointer-events: none;
}
.hero-content { position: relative; z-index: 1; text-align: center; padding: 0 20px; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 16px;
  background: rgba(10, 94, 176, 0.25);
  border: 1px solid rgba(59, 159, 239, 0.4);
  border-radius: 20px;
  font-size: 13px; color: var(--color-primary-pale);
  margin-bottom: 24px;
  animation: fadeInDown 0.8s ease;
}
.hero-badge::before {
  content: '';
  width: 8px; height: 8px;
  background: var(--color-primary-pale);
  border-radius: 50%;
  animation: pulse 2s infinite;
}
.hero-title {
  font-size: clamp(32px, 5vw, 60px);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 16px;
  animation: fadeInUp 0.8s 0.2s ease both;
}
.hero-title .highlight {
  background: linear-gradient(90deg, var(--color-primary-light), var(--color-primary-pale));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-subtitle {
  font-size: clamp(15px, 2vw, 18px);
  color: var(--color-text-muted);
  max-width: 620px;
  margin: 0 auto 36px;
  animation: fadeInUp 0.8s 0.35s ease both;
}
.hero-buttons {
  display: flex; gap: 16px; justify-content: center; flex-wrap: wrap;
  animation: fadeInUp 0.8s 0.5s ease both;
}
.btn-primary {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 14px 32px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  color: #fff;
  font-size: 15px; font-weight: 600;
  border-radius: 8px;
  border: none; cursor: pointer;
  transition: all var(--transition-base);
  box-shadow: 0 4px 20px rgba(10, 94, 176, 0.4);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(10, 94, 176, 0.6);
}
.btn-outline {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 13px 32px;
  background: transparent;
  color: #fff;
  font-size: 15px; font-weight: 600;
  border-radius: 8px;
  border: 1px solid rgba(255,255,255,0.3);
  cursor: pointer;
  transition: all var(--transition-base);
}
.btn-outline:hover {
  background: rgba(255,255,255,0.08);
  border-color: rgba(255,255,255,0.6);
}

/* Hero 滚动指示器 */
.hero-scroll {
  position: absolute;
  bottom: 32px; left: 50%;
  transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center; gap: 8px;
  color: var(--color-text-muted); font-size: 12px;
  animation: fadeIn 1s 1.2s ease both;
}
.scroll-dot {
  width: 24px; height: 38px;
  border: 2px solid rgba(255,255,255,0.25);
  border-radius: 12px;
  position: relative;
}
.scroll-dot::after {
  content: '';
  position: absolute;
  top: 6px; left: 50%;
  transform: translateX(-50%);
  width: 4px; height: 8px;
  background: var(--color-primary-pale);
  border-radius: 2px;
  animation: scrollDown 1.8s infinite;
}

/* ============================================================
   Section 通用
   ============================================================ */
.section { padding: 88px 0; }
.section-light { background: #f8fafc; color: var(--color-text-dark); }
.section-dark { background: var(--color-bg-card); }
.section-darker { background: var(--color-bg-darker); }

.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 20px;
}

.section-header { text-align: center; margin-bottom: 56px; }
.section-tag {
  display: inline-block;
  padding: 4px 14px;
  background: rgba(10, 94, 176, 0.15);
  border: 1px solid rgba(26, 127, 212, 0.35);
  border-radius: 20px;
  font-size: 12px; letter-spacing: 0.08em;
  color: var(--color-primary-pale);
  margin-bottom: 14px;
}
.section-title {
  font-size: clamp(26px, 3.5vw, 40px);
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: 14px;
}
.section-title-dark { color: var(--color-text-darker); }
.section-desc {
  font-size: 16px;
  color: var(--color-text-muted);
  max-width: 560px;
  margin: 0 auto;
}
.section-desc-dark { color: #64748b; }

.divider {
  width: 60px; height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-primary-pale));
  margin: 0 auto 20px;
  border-radius: 2px;
}

/* ============================================================
   数据统计卡片
   ============================================================ */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.stat-card {
  background: var(--color-bg-card2);
  border: 1px solid var(--color-border);
  border-radius: 16px;
  padding: 32px 24px;
  text-align: center;
  position: relative;
  overflow: hidden;
  transition: all var(--transition-base);
}
.stat-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-primary-pale));
}
.stat-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(10, 94, 176, 0.25);
  border-color: rgba(59, 159, 239, 0.5);
}
.stat-number {
  font-size: clamp(36px, 4vw, 52px);
  font-weight: 800;
  background: linear-gradient(135deg, var(--color-primary-light), var(--color-primary-pale));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  margin-bottom: 8px;
}
.stat-label { font-size: 15px; color: var(--color-text-muted); font-weight: 500; }

/* ============================================================
   业务卡片 (通用)
   ============================================================ */
.card-grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.card-grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.card-grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }

.biz-card {
  background: var(--color-bg-card2);
  border: 1px solid var(--color-border);
  border-radius: 16px;
  padding: 32px 24px;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}
.biz-card::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(10,94,176,0.05), transparent);
  opacity: 0;
  transition: opacity var(--transition-base);
}
.biz-card:hover {
  transform: translateY(-6px);
  border-color: rgba(59, 159, 239, 0.5);
  box-shadow: 0 16px 48px rgba(10, 94, 176, 0.2);
}
.biz-card:hover::after { opacity: 1; }

.biz-icon {
  width: 56px; height: 56px;
  background: linear-gradient(135deg, rgba(10,94,176,0.3), rgba(59,159,239,0.15));
  border: 1px solid rgba(59,159,239,0.3);
  border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 20px;
  font-size: 24px;
}
.biz-title { font-size: 18px; font-weight: 600; margin-bottom: 10px; }
.biz-desc { font-size: 14px; color: var(--color-text-muted); line-height: 1.7; }

/* 浅色区域的卡片 */
.biz-card-light {
  background: #fff;
  border: 1px solid #e2e8f0;
  border-radius: 16px;
  padding: 32px 24px;
  transition: all var(--transition-base);
  position: relative;
}
.biz-card-light:hover {
  transform: translateY(-6px);
  border-color: var(--color-primary-light);
  box-shadow: 0 16px 48px rgba(10, 94, 176, 0.12);
}
.biz-title-dark { color: var(--color-text-darker); font-size: 18px; font-weight: 600; margin-bottom: 10px; }
.biz-desc-dark { color: #64748b; font-size: 14px; line-height: 1.7; }

/* ============================================================
   产品卡片
   ============================================================ */
.product-card {
  background: var(--color-bg-card2);
  border: 1px solid var(--color-border);
  border-radius: 16px;
  overflow: hidden;
  transition: all var(--transition-base);
}
.product-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 20px 50px rgba(10, 94, 176, 0.25);
  border-color: rgba(59, 159, 239, 0.5);
}
.product-img {
  width: 100%;
  height: 220px;
  object-fit: cover;
  background: linear-gradient(135deg, var(--color-bg-darker), var(--color-bg-card));
  display: flex; align-items: center; justify-content: center;
}
.product-body { padding: 24px; }
.product-tag {
  display: inline-block; padding: 3px 10px;
  background: rgba(10,94,176,0.2); border-radius: 4px;
  font-size: 12px; color: var(--color-primary-pale);
  margin-bottom: 10px;
}
.product-name { font-size: 17px; font-weight: 600; margin-bottom: 8px; }
.product-desc { font-size: 13px; color: var(--color-text-muted); margin-bottom: 16px; line-height: 1.6; }
.product-specs { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 16px; }
.spec-badge {
  padding: 3px 10px;
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 4px;
  font-size: 12px; color: var(--color-text-muted);
}
.product-link {
  display: inline-flex; align-items: center; gap: 6px;
  color: var(--color-primary-pale); font-size: 14px; font-weight: 500;
  transition: gap var(--transition-base);
}
.product-link:hover { gap: 10px; }

/* ============================================================
   案例卡片
   ============================================================ */
.case-card {
  border-radius: 12px;
  overflow: hidden;
  position: relative;
  cursor: pointer;
}
.case-img {
  width: 100%; height: 200px; object-fit: cover;
  transition: transform 0.5s ease;
  display: block;
  background: linear-gradient(135deg, #0d3a6e, #0a5eb0);
}
.case-card:hover .case-img { transform: scale(1.07); }
.case-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(0deg, rgba(6,15,30,0.9) 0%, rgba(6,15,30,0) 60%);
  display: flex; flex-direction: column; justify-content: flex-end;
  padding: 20px;
}
.case-industry {
  font-size: 11px; color: var(--color-primary-pale);
  text-transform: uppercase; letter-spacing: 0.08em;
  margin-bottom: 4px;
}
.case-name { font-size: 15px; font-weight: 600; }
.case-meta { font-size: 12px; color: var(--color-text-muted); margin-top: 4px; }

/* ============================================================
   资讯卡片
   ============================================================ */
.news-card {
  display: flex; gap: 20px;
  padding: 20px 0;
  border-bottom: 1px solid rgba(255,255,255,0.06);
  transition: all var(--transition-base);
}
.news-card:hover { padding-left: 8px; }
.news-date {
  min-width: 52px; text-align: center;
  background: rgba(10,94,176,0.2);
  border-radius: 8px;
  padding: 10px 6px;
  display: flex; flex-direction: column; align-items: center;
  border: 1px solid var(--color-border);
}
.news-day { font-size: 22px; font-weight: 700; color: var(--color-primary-pale); line-height: 1; }
.news-month { font-size: 11px; color: var(--color-text-muted); margin-top: 2px; }
.news-body { flex: 1; }
.news-cat {
  font-size: 11px; color: var(--color-primary-pale);
  text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 4px;
}
.news-title { font-size: 15px; font-weight: 600; margin-bottom: 6px; line-height: 1.45; }
.news-title a:hover { color: var(--color-primary-pale); }
.news-summary { font-size: 13px; color: var(--color-text-muted); line-height: 1.6; }

/* 大资讯卡片 */
.news-card-big {
  background: var(--color-bg-card2);
  border: 1px solid var(--color-border);
  border-radius: 16px;
  overflow: hidden;
  transition: all var(--transition-base);
}
.news-card-big:hover {
  transform: translateY(-4px);
  box-shadow: 0 14px 40px rgba(10,94,176,0.2);
  border-color: rgba(59,159,239,0.4);
}
.news-img { width: 100%; height: 200px; object-fit: cover; background: linear-gradient(135deg,#0d3a6e,#1a7fd4); display: flex; align-items: center; justify-content: center; }
.news-body-big { padding: 20px; }

/* ============================================================
   页面标题区 (内页 banner)
   ============================================================ */
.page-hero {
  padding: 140px 0 70px;
  background:
    radial-gradient(ellipse 60% 80% at 30% 50%, rgba(10,94,176,0.3) 0%, transparent 70%),
    linear-gradient(180deg, var(--color-bg-darker), var(--color-bg-dark));
  position: relative;
  overflow: hidden;
}
.page-hero-grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(26,127,212,0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(26,127,212,0.06) 1px, transparent 1px);
  background-size: 48px 48px;
}
.page-hero h1 { font-size: clamp(28px, 4vw, 46px); font-weight: 700; margin-bottom: 12px; }
.breadcrumb { display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--color-text-muted); }
.breadcrumb a:hover { color: var(--color-primary-pale); }
.breadcrumb span { color: rgba(255,255,255,0.3); }

/* ============================================================
   优势列表
   ============================================================ */
.advantage-item {
  display: flex; align-items: flex-start; gap: 16px;
  padding: 24px;
  background: var(--color-bg-card2);
  border: 1px solid var(--color-border);
  border-radius: 14px;
  transition: all var(--transition-base);
  margin-bottom: 16px;
}
.advantage-item:hover {
  border-color: rgba(59,159,239,0.5);
  transform: translateX(4px);
}
.advantage-icon-wrap {
  width: 48px; height: 48px; min-width: 48px;
  background: linear-gradient(135deg, rgba(10,94,176,0.35), rgba(59,159,239,0.15));
  border: 1px solid rgba(59,159,239,0.3);
  border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  font-size: 20px;
}
.advantage-title { font-size: 16px; font-weight: 600; margin-bottom: 5px; }
.advantage-desc { font-size: 13px; color: var(--color-text-muted); line-height: 1.6; }

/* ============================================================
   合作伙伴 / 行业标签
   ============================================================ */
.industry-tag {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 8px 16px;
  background: rgba(13,31,53,0.8);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  font-size: 13px;
  transition: all var(--transition-base);
  cursor: pointer;
}
.industry-tag:hover, .industry-tag.active {
  background: rgba(10,94,176,0.25);
  border-color: var(--color-primary-pale);
  color: var(--color-primary-pale);
}

/* ============================================================
   联系 / 表单
   ============================================================ */
.form-group { margin-bottom: 20px; }
.form-label { display: block; font-size: 14px; color: var(--color-text-muted); margin-bottom: 8px; }
.form-input, .form-textarea, .form-select {
  width: 100%;
  background: rgba(15,39,68,0.6);
  border: 1px solid rgba(26,127,212,0.3);
  border-radius: 8px;
  padding: 12px 16px;
  font-size: 14px;
  color: #fff;
  font-family: var(--font-primary);
  transition: all var(--transition-base);
  outline: none;
}
.form-input:focus, .form-textarea:focus, .form-select:focus {
  border-color: var(--color-primary-light);
  box-shadow: 0 0 0 3px rgba(26,127,212,0.15);
}
.form-textarea { resize: vertical; min-height: 120px; }

/* ============================================================
   页脚
   ============================================================ */
footer {
  background: var(--color-bg-darker);
  border-top: 1px solid rgba(26,127,212,0.15);
}
.footer-top { padding: 64px 0 48px; }
.footer-logo-text { font-size: 20px; font-weight: 700; margin-bottom: 6px; }
.footer-logo-sub { font-size: 12px; color: var(--color-text-muted); margin-bottom: 20px; }
.footer-about { font-size: 13px; color: var(--color-text-muted); line-height: 1.8; max-width: 280px; }
.footer-heading { font-size: 14px; font-weight: 600; color: #fff; margin-bottom: 18px; padding-bottom: 10px; border-bottom: 1px solid rgba(255,255,255,0.08); }
.footer-links li { margin-bottom: 10px; }
.footer-links a { font-size: 13px; color: var(--color-text-muted); transition: all var(--transition-base); }
.footer-links a:hover { color: var(--color-primary-pale); padding-left: 4px; }
.footer-contact-item { display: flex; align-items: flex-start; gap: 10px; margin-bottom: 12px; }
.footer-contact-icon { color: var(--color-primary-pale); margin-top: 2px; font-size: 14px; min-width: 16px; }
.footer-contact-text { font-size: 13px; color: var(--color-text-muted); line-height: 1.6; }
.footer-bottom {
  padding: 20px 0;
  border-top: 1px solid rgba(255,255,255,0.05);
  display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 12px;
}
.footer-copy { font-size: 12px; color: rgba(255,255,255,0.3); }
.footer-icp { font-size: 12px; color: rgba(255,255,255,0.3); }
.footer-icp a:hover { color: var(--color-primary-pale); }

/* ============================================================
   动画
   ============================================================ */
@keyframes fadeIn    { from { opacity: 0; } to { opacity: 1; } }
@keyframes fadeInUp  { from { opacity: 0; transform: translateY(24px); } to { opacity: 1; transform: translateY(0); } }
@keyframes fadeInDown{ from { opacity: 0; transform: translateY(-16px); } to { opacity: 1; transform: translateY(0); } }
@keyframes fadeInLeft{ from { opacity: 0; transform: translateX(-24px); } to { opacity: 1; transform: translateX(0); } }
@keyframes fadeInRight{from { opacity: 0; transform: translateX(24px); } to { opacity: 1; transform: translateX(0); } }
@keyframes pulse     { 0%,100% { opacity: 1; } 50% { opacity: 0.4; } }
@keyframes scrollDown{ 0% { opacity: 1; top: 6px; } 80% { opacity: 0; top: 22px; } 100% { opacity: 0; top: 6px; } }
@keyframes float     { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-12px); } }
@keyframes shimmer   { 0% { background-position: -200% center; } 100% { background-position: 200% center; } }
@keyframes rotateSlow{ from { transform: rotate(0deg); } to { transform: rotate(360deg); } }
@keyframes borderGlow {
  0%, 100% { box-shadow: 0 0 0 0 rgba(26,127,212,0); }
  50% { box-shadow: 0 0 20px 4px rgba(26,127,212,0.25); }
}

/* 滚动进入动画 */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}
.reveal-left {
  opacity: 0;
  transform: translateX(-30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal-left.visible { opacity: 1; transform: translateX(0); }
.reveal-right {
  opacity: 0;
  transform: translateX(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal-right.visible { opacity: 1; transform: translateX(0); }

.delay-100 { transition-delay: 0.1s; }
.delay-200 { transition-delay: 0.2s; }
.delay-300 { transition-delay: 0.3s; }
.delay-400 { transition-delay: 0.4s; }
.delay-500 { transition-delay: 0.5s; }

/* 流光按钮 */
.btn-glow {
  position: relative; overflow: hidden;
}
.btn-glow::before {
  content: '';
  position: absolute;
  top: 0; left: -100%;
  width: 60%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
  transition: left 0.5s ease;
}
.btn-glow:hover::before { left: 150%; }

/* ============================================================
   响应式断点
   ============================================================ */
@media (max-width: 1024px) {
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .card-grid-4 { grid-template-columns: repeat(2, 1fr); }
  .card-grid-3 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .section { padding: 64px 0; }
  .nav-menu, .nav-phone { display: none; }
  .hamburger { display: flex; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
  .card-grid-3, .card-grid-4, .card-grid-2 { grid-template-columns: 1fr; }
  .hero-buttons { flex-direction: column; align-items: center; }
  .footer-bottom { flex-direction: column; text-align: center; }
}

@media (max-width: 480px) {
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .stat-card { padding: 22px 14px; }
}

/* ============================================================
   工具类补充
   ============================================================ */
.text-gradient {
  background: linear-gradient(90deg, var(--color-primary-light), var(--color-primary-pale));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.border-glow { border: 1px solid var(--color-border); animation: borderGlow 3s ease infinite; }
.glass {
  background: rgba(13, 31, 53, 0.7);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(26,127,212,0.2);
}
.line-clamp-2 { display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.line-clamp-3 { display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }

/* 角标装饰 */
.corner-deco {
  position: absolute;
  width: 20px; height: 20px;
  border-color: var(--color-primary-pale);
  border-style: solid;
}
.corner-tl { top: 10px; left: 10px; border-width: 2px 0 0 2px; }
.corner-tr { top: 10px; right: 10px; border-width: 2px 2px 0 0; }
.corner-bl { bottom: 10px; left: 10px; border-width: 0 0 2px 2px; }
.corner-br { bottom: 10px; right: 10px; border-width: 0 2px 2px 0; }

/* ============================================================
   nav-toggle 汉堡按钮 & nav-menu 响应式
   ============================================================ */
.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  height: 72px;
}
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 6px;
}
.nav-toggle span {
  width: 24px;
  height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: all .3s;
  display: block;
}
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* 下拉子菜单 */
.nav-has-sub { position: relative; }
.nav-submenu {
  display: none;
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  min-width: 200px;
  background: rgba(6,15,30,0.98);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 8px 0;
  z-index: 1100;
  box-shadow: 0 12px 36px rgba(0,0,0,0.5);
  backdrop-filter: blur(12px);
}
.nav-submenu li a {
  display: block;
  padding: 10px 18px;
  font-size: .875rem;
  color: var(--color-text-muted);
  transition: all .25s;
}
.nav-submenu li a:hover {
  color: #fff;
  background: rgba(26,127,212,0.15);
  padding-left: 24px;
}

/* 当前页激活态 */
#navMenu a.active {
  color: var(--color-primary-pale);
  background: rgba(26,127,212,0.15);
  border-radius: 6px;
}

/* 页脚栅格 */
#footer .container { padding: 0 24px; }
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  padding: 64px 0 48px;
}
.footer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
  font-size: 1rem;
  font-weight: 700;
}
.footer-logo-icon {
  width: 36px; height: 36px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-pale));
  border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  font-size: .75rem;
  font-weight: 800;
  flex-shrink: 0;
}
.footer-desc {
  font-size: .88rem;
  color: var(--color-text-muted);
  line-height: 1.8;
  margin-bottom: 20px;
}
.footer-contact { display: flex; flex-direction: column; gap: 10px; }
.footer-contact-item {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  font-size: .85rem;
  color: var(--color-text-muted);
}
.footer-contact-item a:hover { color: var(--color-primary-pale); }
.footer-contact-item svg { flex-shrink: 0; margin-top: 2px; color: var(--color-primary-pale); }
.footer-title {
  font-size: .95rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 18px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.footer-links { display: flex; flex-direction: column; gap: 10px; }
.footer-links a {
  font-size: .85rem;
  color: var(--color-text-muted);
  transition: all .3s;
}
.footer-links a:hover { color: var(--color-primary-pale); padding-left: 4px; }
.footer-bottom {
  padding: 20px 0;
  border-top: 1px solid rgba(255,255,255,0.06);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  font-size: .82rem;
  color: rgba(255,255,255,0.3);
}

/* hero-particles 装饰 */
.hero-particles {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    radial-gradient(circle at 20% 20%, rgba(26,127,212,0.08) 0, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(59,159,239,0.06) 0, transparent 50%);
}

/* btn 通用 */
.btn-primary {
  display: inline-flex;
  align-items: center;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  color: #fff;
  font-weight: 600;
  border-radius: 6px;
  padding: 12px 28px;
  transition: all .3s;
  border: none;
  cursor: pointer;
  text-decoration: none;
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(10,94,176,0.4);
  filter: brightness(1.1);
}
.btn-outline {
  display: inline-flex;
  align-items: center;
  background: transparent;
  color: var(--color-primary-pale);
  font-weight: 600;
  border-radius: 6px;
  padding: 12px 28px;
  border: 1px solid rgba(59,159,239,0.5);
  transition: all .3s;
  text-decoration: none;
}
.btn-outline:hover {
  background: rgba(59,159,239,0.1);
  border-color: var(--color-primary-pale);
  transform: translateY(-2px);
}

/* section 通用 */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}
.section-title {
  text-align: center;
  margin-bottom: 20px;
}
.section-title h2 {
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  font-weight: 800;
  margin-bottom: 14px;
}
.section-title p {
  color: var(--color-text-muted);
  max-width: 600px;
  margin: 0 auto;
  font-size: .95rem;
}
.section-tag {
  display: inline-block;
  padding: 4px 14px;
  background: rgba(10,94,176,0.15);
  border: 1px solid rgba(26,127,212,0.35);
  border-radius: 20px;
  font-size: .8rem;
  color: var(--color-primary-pale);
  margin-bottom: 12px;
  letter-spacing: 1px;
}

/* 响应式补充 */
@media (max-width: 768px) {
  .nav-menu { display: none; flex-direction: column; position: fixed; top: 72px; left: 0; right: 0; background: rgba(6,15,30,0.98); padding: 16px 20px 24px; z-index: 999; border-bottom: 1px solid var(--color-border); backdrop-filter: blur(12px); }
  .nav-menu.open { display: flex; }
  .nav-menu li a { display: block; padding: 12px 8px; font-size: .95rem; border-bottom: 1px solid rgba(255,255,255,0.05); }
  .nav-submenu { position: static; display: none !important; box-shadow: none; border: none; padding-left: 16px; }
  .nav-phone { display: none; }
  .nav-toggle { display: flex; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 28px; padding: 40px 0 32px; }
}
@media (max-width: 480px) {
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; text-align: center; }
}