/* ===== 全局变量 ===== */
:root {
  --primary: #1677ff;
  --primary-light: #4096ff;
  --primary-dark: #0958d9;
  --secondary: #00c6ff;
  --accent: #36cfc9;
  --success: #52c41a;
  --warning: #faad14;
  --danger: #ff4d4f;
  --purple: #722ed1;
  --text-primary: #1a1a2e;
  --text-secondary: #4a5568;
  --text-light: #8c96a3;
  --bg-light: #f8faff;
  --bg-white: #ffffff;
  --border: #e8edf5;
  --shadow: 0 4px 20px rgba(22,119,255,0.10);
  --shadow-lg: 0 12px 40px rgba(22,119,255,0.18);
  --radius: 12px;
  --radius-lg: 20px;
  --transition: 0.3s ease;
  --header-h: 72px;
  --gradient: linear-gradient(135deg, #1677ff 0%, #00c6ff 100%);
  --gradient-soft: linear-gradient(135deg, #e8f4fd 0%, #f0f9ff 100%);
}

/* ===== Reset ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text-primary); background: var(--bg-white); line-height: 1.6; overflow-x: hidden;
}
a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }
ul { list-style: none; }
input, select, textarea, button { font-family: inherit; outline: none; border: none; background: none; }
button { cursor: pointer; }

/* ===== 容器 ===== */
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* ===== 通用按钮 ===== */
.btn-primary {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--gradient); color: #fff;
  padding: 10px 24px; border-radius: 8px;
  font-size: 15px; font-weight: 600;
  transition: all var(--transition);
  box-shadow: 0 4px 15px rgba(22,119,255,0.35);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 25px rgba(22,119,255,0.45); }

.btn-outline {
  display: inline-flex; align-items: center; gap: 8px;
  border: 2px solid var(--primary); color: var(--primary);
  padding: 8px 22px; border-radius: 8px;
  font-size: 15px; font-weight: 600;
  transition: all var(--transition);
}
.btn-outline:hover { background: var(--primary); color: #fff; transform: translateY(-2px); }

.btn-ghost {
  display: inline-flex; align-items: center; gap: 8px;
  border: 2px solid rgba(255,255,255,0.6); color: #fff;
  padding: 10px 24px; border-radius: 8px;
  font-size: 15px; font-weight: 600;
  transition: all var(--transition);
  backdrop-filter: blur(4px);
}
.btn-ghost:hover { background: rgba(255,255,255,0.15); transform: translateY(-2px); }
.btn-lg { padding: 14px 32px; font-size: 16px; border-radius: 10px; }
.btn-full { width: 100%; justify-content: center; }

/* ===== Section ===== */
.section { padding: 80px 0; }
.bg-light { background: var(--bg-light); }
.section-header { text-align: center; margin-bottom: 56px; }

.section-tag {
  display: inline-block; background: rgba(22,119,255,0.1); color: var(--primary);
  padding: 4px 16px; border-radius: 20px; font-size: 13px; font-weight: 600;
  margin-bottom: 12px; letter-spacing: 1px;
}
.section-title { font-size: 32px; font-weight: 700; color: var(--text-primary); margin-bottom: 14px; line-height: 1.3; }
.section-desc { font-size: 16px; color: var(--text-secondary); max-width: 600px; margin: 0 auto; }
.white-header .section-title,
.white-header .section-desc { color: #fff; }

/* ===== HEADER ===== */
.header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  height: var(--header-h);
  background: rgba(255,255,255,0.97);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  transition: box-shadow var(--transition);
}
.header.scrolled { box-shadow: 0 4px 20px rgba(22,119,255,0.12); }
.header-inner { display: flex; align-items: center; height: var(--header-h); gap: 32px; }

/* Logo: 219×63 */
.logo a { display: block; }
.logo-box {
  display: flex; align-items: center; gap: 10px;
  width: 219px; height: 63px;
  flex-shrink: 0;
}
.logo-icon {
  width: 44px; height: 44px; border-radius: 12px;
  background: var(--gradient);
  display: flex; align-items: center; justify-content: center;
  color: #fff; font-size: 22px;
  box-shadow: 0 4px 12px rgba(22,119,255,0.35);
  flex-shrink: 0;
}
.logo-text { display: flex; flex-direction: column; line-height: 1; }
.logo-name { font-size: 22px; font-weight: 800; color: var(--text-primary); letter-spacing: 1px; }
.logo-sub { font-size: 10px; color: var(--primary); letter-spacing: 2px; font-weight: 600; margin-top: 3px; }
.footer-logo { width: auto; height: auto; margin-bottom: 14px; }

/* 导航 */
.nav { flex: 1; }
.nav-list { display: flex; align-items: center; gap: 4px; }
.nav-link {
  padding: 8px 14px; border-radius: 8px; font-size: 15px;
  color: var(--text-secondary); font-weight: 500;
  transition: all var(--transition);
}
.nav-link:hover, .nav-link.active { color: var(--primary); background: rgba(22,119,255,0.08); }

/* Header Actions */
.header-actions { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.menu-toggle {
  display: none; flex-direction: column; gap: 5px;
  width: 32px; height: 32px; padding: 6px;
  background: none; border: none; cursor: pointer;
}
.menu-toggle span {
  display: block; width: 20px; height: 2px;
  background: var(--text-primary); border-radius: 2px;
  transition: all var(--transition);
}
.menu-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.menu-toggle.open span:nth-child(2) { opacity: 0; }
.menu-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* 移动端导航 */
.mobile-nav {
  display: none; position: absolute; top: var(--header-h); left: 0; right: 0;
  background: #fff; border-bottom: 1px solid var(--border);
  box-shadow: 0 8px 24px rgba(22,119,255,0.12);
  max-height: 0; overflow: hidden; transition: max-height 0.4s ease;
}
.mobile-nav.open { max-height: 400px; }
.mobile-nav-list { padding: 12px 0; }
.mobile-nav-link {
  display: block; padding: 14px 24px; font-size: 16px;
  color: var(--text-primary); border-bottom: 1px solid var(--bg-light);
  transition: all var(--transition);
}
.mobile-nav-link:hover { color: var(--primary); background: var(--bg-light); }

/* ===== BANNER ===== */
.banner {
  min-height: 100vh; padding-top: var(--header-h);
  background: linear-gradient(135deg, #0a1628 0%, #0d2149 40%, #1677ff 100%);
  display: flex; align-items: center;
  position: relative; overflow: hidden;
}
.banner-bg { position: absolute; inset: 0; overflow: hidden; pointer-events: none; }
.bubble {
  position: absolute; border-radius: 50%;
  background: radial-gradient(circle, rgba(0,198,255,0.18) 0%, transparent 70%);
  animation: float 8s ease-in-out infinite;
}
.b1 { width: 500px; height: 500px; top: -100px; right: -100px; animation-delay: 0s; }
.b2 { width: 350px; height: 350px; bottom: 50px; left: -80px; animation-delay: 2s; }
.b3 { width: 200px; height: 200px; top: 40%; left: 30%; animation-delay: 4s; }
.b4 { width: 150px; height: 150px; top: 20%; right: 35%; animation-delay: 1s; }
@keyframes float {
  0%,100% { transform: translateY(0) scale(1); }
  50% { transform: translateY(-30px) scale(1.05); }
}

.banner-content {
  display: flex; align-items: center; gap: 60px;
  padding: 60px 24px; position: relative; z-index: 1;
}
.banner-text { flex: 1; min-width: 0; }
.banner-tag {
  display: inline-block; background: rgba(255,255,255,0.12); color: #fff;
  padding: 6px 18px; border-radius: 20px; font-size: 14px;
  border: 1px solid rgba(255,255,255,0.2); margin-bottom: 20px;
  backdrop-filter: blur(4px);
}
.banner-title { font-size: 46px; font-weight: 800; color: #fff; line-height: 1.25; margin-bottom: 20px; }
.banner-title .highlight {
  background: linear-gradient(90deg, #00c6ff, #7cffcb);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.banner-desc { font-size: 17px; color: rgba(255,255,255,0.82); margin-bottom: 36px; max-width: 520px; line-height: 1.75; }
.banner-btns { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 40px; }
.banner-stats { display: flex; gap: 36px; flex-wrap: wrap; }
.b-stat { text-align: center; }
.b-stat strong { display: block; font-size: 28px; font-weight: 800; color: #fff; }
.b-stat span { font-size: 13px; color: rgba(255,255,255,0.65); }

/* 手机模型 */
.banner-visual { flex-shrink: 0; position: relative; }
.phone-mockup {
  width: 280px; background: #111827; border-radius: 36px;
  padding: 18px 12px; box-shadow: 0 30px 80px rgba(0,0,0,0.5), 0 0 0 2px rgba(255,255,255,0.08);
}
.phone-screen { background: #f0f4ff; border-radius: 26px; padding: 14px; min-height: 380px; }
.msg-list { display: flex; flex-direction: column; gap: 10px; }
.msg-item {
  background: #fff; border-radius: 12px; padding: 12px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
  border-left: 4px solid #1677ff;
}
.msg-item--blue { border-left-color: #00c6ff; }
.msg-item--orange { border-left-color: #fa8c16; }
.msg-from { font-size: 11px; color: #888; margin-bottom: 4px; }
.msg-content { font-size: 12px; color: #333; line-height: 1.5; }
.msg-time { font-size: 10px; color: #aaa; text-align: right; margin-top: 6px; }

.float-card {
  position: absolute; background: #fff; border-radius: 12px;
  padding: 8px 16px; display: flex; align-items: center; gap: 8px;
  font-size: 13px; font-weight: 600; color: var(--text-primary);
  box-shadow: 0 8px 24px rgba(22,119,255,0.2);
  animation: float 4s ease-in-out infinite;
}
.float-card i { color: var(--primary); font-size: 16px; }
.fc1 { top: 30px; left: -60px; animation-delay: 0s; }
.fc2 { bottom: 80px; left: -70px; animation-delay: 1s; }
.fc3 { bottom: 30px; right: -50px; animation-delay: 2s; }

/* ===== 产品服务 ===== */
.product-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.product-card {
  background: #fff; border-radius: var(--radius-lg); padding: 32px 24px;
  border: 1.5px solid var(--border); transition: all var(--transition);
  position: relative; overflow: hidden;
}
.product-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 4px;
  background: var(--gradient); opacity: 0; transition: opacity var(--transition);
}
.product-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: rgba(22,119,255,0.2); }
.product-card:hover::before { opacity: 1; }
.product-card--featured {
  background: var(--gradient); color: #fff;
  border-color: transparent; box-shadow: var(--shadow-lg);
}
.product-card--featured h3,
.product-card--featured p { color: #fff; }
.product-card--featured .product-list li { color: rgba(255,255,255,0.9); }
.product-card--featured .product-link { color: rgba(255,255,255,0.9); }
.product-card--featured:hover { transform: translateY(-8px) scale(1.02); }
.featured-tag {
  position: absolute; top: 16px; right: 16px;
  background: rgba(255,255,255,0.25); color: #fff;
  padding: 3px 12px; border-radius: 20px; font-size: 12px; font-weight: 600;
}
.product-icon {
  width: 56px; height: 56px; border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  font-size: 24px; margin-bottom: 18px;
}
.icon-blue { background: rgba(22,119,255,0.1); color: var(--primary); }
.icon-green { background: rgba(82,196,26,0.1); color: var(--success); }
.icon-purple { background: rgba(114,46,209,0.1); color: var(--purple); }
.icon-white { background: rgba(255,255,255,0.25); color: #fff; }
.product-card h3 { font-size: 18px; font-weight: 700; color: var(--text-primary); margin-bottom: 10px; }
.product-card p { font-size: 14px; color: var(--text-secondary); line-height: 1.65; margin-bottom: 18px; }
.product-list { margin-bottom: 20px; }
.product-list li { display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--text-secondary); padding: 4px 0; }
.product-list li i { color: var(--success); font-size: 12px; }
.product-link { font-size: 14px; font-weight: 600; color: var(--primary); display: flex; align-items: center; gap: 6px; transition: gap var(--transition); }
.product-link:hover { gap: 10px; }

/* ===== 核心优势 ===== */
.features-layout { display: flex; align-items: center; gap: 32px; }
.features-left, .features-right { flex: 1; display: flex; flex-direction: column; gap: 28px; }
.features-center { width: 220px; flex-shrink: 0; display: flex; justify-content: center; }
.feature-item { display: flex; gap: 16px; }
.feature-icon {
  width: 50px; height: 50px; border-radius: 14px; flex-shrink: 0;
  background: var(--gradient); color: #fff;
  display: flex; align-items: center; justify-content: center; font-size: 20px;
  box-shadow: 0 4px 14px rgba(22,119,255,0.3);
}
.feature-body h4 { font-size: 16px; font-weight: 700; color: var(--text-primary); margin-bottom: 6px; }
.feature-body p { font-size: 13px; color: var(--text-secondary); line-height: 1.6; }

.center-circle {
  width: 200px; height: 200px; border-radius: 50%;
  background: var(--gradient); display: flex; align-items: center; justify-content: center;
  box-shadow: 0 0 0 20px rgba(22,119,255,0.1), 0 0 0 40px rgba(22,119,255,0.05);
  animation: pulse-ring 3s ease-in-out infinite;
}
.circle-inner { text-align: center; color: #fff; }
.circle-inner i { font-size: 40px; display: block; margin-bottom: 8px; }
.circle-inner span { font-size: 20px; font-weight: 800; display: block; }
.circle-inner small { font-size: 12px; opacity: 0.8; }
@keyframes pulse-ring {
  0%,100% { box-shadow: 0 0 0 20px rgba(22,119,255,0.12), 0 0 0 40px rgba(22,119,255,0.06); }
  50% { box-shadow: 0 0 0 30px rgba(22,119,255,0.08), 0 0 0 60px rgba(22,119,255,0.03); }
}

/* ===== 数据统计 ===== */
.stats-section { background: linear-gradient(135deg, #0d2149 0%, #1677ff 60%, #00c6ff 100%); }
.stats-section .section-title { color: #fff; }
.stats-section .section-desc { color: rgba(255,255,255,0.8); }
.tag-light { background: rgba(255,255,255,0.2); color: #fff; }
.stats-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 20px; }
.stat-item {
  text-align: center; background: rgba(255,255,255,0.1);
  border-radius: var(--radius); padding: 28px 16px;
  border: 1px solid rgba(255,255,255,0.15); backdrop-filter: blur(8px);
  transition: all var(--transition);
}
.stat-item:hover { background: rgba(255,255,255,0.18); transform: translateY(-4px); }
.stat-icon { font-size: 28px; color: rgba(255,255,255,0.8); margin-bottom: 12px; }
.stat-num { font-size: 36px; font-weight: 800; color: #fff; display: inline; }
.stat-unit { font-size: 16px; font-weight: 600; color: rgba(255,255,255,0.9); }
.stat-label { font-size: 13px; color: rgba(255,255,255,0.7); margin-top: 6px; }

/* ===== 行业 ===== */
.industry-grid { display: grid; grid-template-columns: repeat(8, 1fr); gap: 16px; }
.industry-card {
  background: #fff; border-radius: var(--radius); padding: 22px 14px;
  text-align: center; border: 1.5px solid var(--border);
  transition: all var(--transition); cursor: pointer;
}
.industry-card:hover { transform: translateY(-5px); box-shadow: var(--shadow); border-color: rgba(22,119,255,0.2); }
.ind-icon {
  width: 52px; height: 52px; border-radius: 14px;
  display: flex; align-items: center; justify-content: center; font-size: 22px;
  margin: 0 auto 12px;
}
.ind-name { font-size: 14px; font-weight: 700; color: var(--text-primary); margin-bottom: 6px; }
.industry-card p { font-size: 11px; color: var(--text-light); line-height: 1.5; }

/* ===== 客户案例 ===== */
.cases-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-bottom: 48px; }
.case-card {
  background: #fff; border-radius: var(--radius-lg); padding: 28px;
  border: 1.5px solid var(--border); display: flex; gap: 18px;
  transition: all var(--transition);
}
.case-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: rgba(22,119,255,0.2); }
.logo-placeholder {
  width: 56px; height: 56px; border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  font-size: 14px; font-weight: 700; flex-shrink: 0;
}
.case-content h4 { font-size: 16px; font-weight: 700; color: var(--text-primary); margin-bottom: 8px; }
.case-content p { font-size: 13px; color: var(--text-secondary); line-height: 1.65; margin-bottom: 12px; }
.case-tags { display: flex; gap: 6px; flex-wrap: wrap; }
.case-tags span {
  background: var(--bg-light); color: var(--primary);
  padding: 2px 10px; border-radius: 20px; font-size: 12px; font-weight: 500;
}

/* 品牌滚动 */
.brand-bar { text-align: center; }
.brand-title { font-size: 14px; color: var(--text-light); margin-bottom: 20px; }
.brand-scroll { overflow: hidden; }
.brand-track { display: flex; gap: 20px; animation: scroll-x 20s linear infinite; width: max-content; }
.brand-item {
  background: #fff; border: 1.5px solid var(--border); border-radius: 10px;
  padding: 14px 32px; font-size: 14px; font-weight: 600; color: var(--text-secondary);
  white-space: nowrap; flex-shrink: 0;
}
@keyframes scroll-x { 0%{transform:translateX(0)} 100%{transform:translateX(-50%)} }

/* ===== 资费方案 ===== */
.pricing-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.pricing-card {
  background: #fff; border-radius: var(--radius-lg); overflow: hidden;
  border: 1.5px solid var(--border); transition: all var(--transition); position: relative;
}
.pricing-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.pricing-card--popular {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(22,119,255,0.15), var(--shadow-lg);
  transform: scale(1.04);
}
.pricing-card--popular:hover { transform: scale(1.04) translateY(-6px); }
.popular-tag {
  position: absolute; top: 16px; right: 16px;
  background: var(--gradient); color: #fff;
  padding: 4px 14px; border-radius: 20px; font-size: 12px; font-weight: 600;
}
.pricing-header { padding: 28px 28px 20px; border-bottom: 1px solid var(--bg-light); }
.pricing-header h3 { font-size: 20px; font-weight: 700; color: var(--text-primary); margin-bottom: 12px; }
.pricing-price { display: flex; align-items: flex-end; gap: 4px; margin-bottom: 8px; }
.price-currency { font-size: 20px; font-weight: 700; color: var(--primary); padding-bottom: 4px; }
.price-num { font-size: 40px; font-weight: 800; color: var(--primary); line-height: 1; }
.price-unit { font-size: 15px; color: var(--text-light); padding-bottom: 6px; }
.pricing-header p { font-size: 13px; color: var(--text-light); }
.pricing-list { padding: 20px 28px; margin-bottom: 4px; }
.pricing-list li { display: flex; align-items: center; gap: 10px; padding: 8px 0; font-size: 14px; color: var(--text-secondary); border-bottom: 1px solid var(--bg-light); }
.pricing-list li:last-child { border-bottom: none; }
.pricing-list li i.fa-check { color: var(--success); }
.pricing-list li i.fa-times { color: #d9d9d9; }
.pricing-list li.disabled { color: #c0c8d4; }
.pricing-card .btn-primary,
.pricing-card .btn-outline { margin: 0 28px 28px; width: calc(100% - 56px); }

/* ===== 联系我们 ===== */
.contact { background: var(--gradient-soft); }
.contact-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: start; }
.contact-info .section-tag { margin-bottom: 14px; }
.contact-info h2 { font-size: 30px; font-weight: 800; color: var(--text-primary); margin-bottom: 14px; }
.contact-info > p { font-size: 15px; color: var(--text-secondary); margin-bottom: 28px; line-height: 1.7; }
.contact-details { display: flex; flex-direction: column; gap: 16px; margin-bottom: 28px; }
.contact-item { display: flex; gap: 14px; align-items: flex-start; }
.contact-item > i {
  width: 42px; height: 42px; border-radius: 12px; flex-shrink: 0;
  background: var(--gradient); color: #fff;
  display: flex; align-items: center; justify-content: center; font-size: 16px;
}
.contact-item strong { display: block; font-size: 13px; color: var(--text-light); margin-bottom: 2px; }
.contact-item span { font-size: 15px; font-weight: 600; color: var(--text-primary); }
.qr-codes { display: flex; gap: 20px; }
.qr-item { text-align: center; }
.qr-placeholder {
  width: 80px; height: 80px; background: #fff; border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  font-size: 32px; color: var(--primary); border: 2px solid var(--border); margin-bottom: 8px;
}
.qr-item span { font-size: 12px; color: var(--text-light); }

.form-card { background: #fff; border-radius: var(--radius-lg); padding: 36px; box-shadow: var(--shadow-lg); }
.form-card h3 { font-size: 22px; font-weight: 800; color: var(--text-primary); margin-bottom: 6px; }
.form-sub { font-size: 14px; color: var(--text-light); margin-bottom: 24px; }
.form-group { margin-bottom: 18px; }
.form-group label { display: block; font-size: 13px; font-weight: 600; color: var(--text-secondary); margin-bottom: 6px; }
.required { color: var(--danger); }
.form-group input,
.form-group select,
.form-group textarea {
  width: 100%; padding: 11px 14px; border: 1.5px solid var(--border); border-radius: 8px;
  font-size: 14px; color: var(--text-primary); transition: border-color var(--transition); background: #fff;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(22,119,255,0.1); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.btn-submit { padding: 14px; font-size: 16px; margin-top: 6px; }
.form-tip { text-align: center; font-size: 12px; color: var(--text-light); margin-top: 12px; display: flex; align-items: center; justify-content: center; gap: 6px; }

/* ===== 页脚 ===== */
.footer { background: #0d1b3e; color: rgba(255,255,255,0.75); }
.footer-top { display: flex; gap: 56px; padding: 56px 0 36px; border-bottom: 1px solid rgba(255,255,255,0.08); }
.footer-brand { width: 260px; flex-shrink: 0; }
.footer-brand .logo-name { color: #fff; }
.footer-brand .logo-sub { color: rgba(255,255,255,0.5); }
.footer-brand > p { font-size: 14px; line-height: 1.7; margin-bottom: 20px; }
.social-links { display: flex; gap: 10px; }
.social-links a {
  width: 36px; height: 36px; border-radius: 8px;
  background: rgba(255,255,255,0.08); color: rgba(255,255,255,0.7);
  display: flex; align-items: center; justify-content: center; font-size: 16px;
  transition: all var(--transition);
}
.social-links a:hover { background: var(--primary); color: #fff; }
.footer-links { flex: 1; display: flex; gap: 36px; }
.footer-col { flex: 1; }
.footer-col h5 { font-size: 15px; font-weight: 700; color: #fff; margin-bottom: 16px; }
.footer-col ul { display: flex; flex-direction: column; gap: 10px; }
.footer-col a { font-size: 14px; color: rgba(255,255,255,0.6); transition: color var(--transition); }
.footer-col a:hover { color: var(--secondary); }
.footer-bottom { padding: 20px 0; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px; }
.footer-bottom p { font-size: 13px; color: rgba(255,255,255,0.45); }

/* ===== 返回顶部 ===== */
.back-to-top {
  position: fixed; bottom: 100px; right: 24px; z-index: 500;
  width: 44px; height: 44px; border-radius: 12px;
  background: var(--gradient); color: #fff; font-size: 16px;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 4px 16px rgba(22,119,255,0.4);
  opacity: 0; pointer-events: none; transition: all var(--transition);
}
.back-to-top.visible { opacity: 1; pointer-events: auto; }
.back-to-top:hover { transform: translateY(-3px); box-shadow: 0 8px 24px rgba(22,119,255,0.5); }

/* ===== 悬浮咨询 ===== */
.float-consult { position: fixed; bottom: 24px; right: 24px; z-index: 500; display: flex; flex-direction: column; gap: 10px; }
.float-btn {
  width: 50px; height: 50px; border-radius: 14px;
  display: flex; align-items: center; justify-content: center; font-size: 20px;
  transition: all var(--transition); box-shadow: 0 4px 16px rgba(0,0,0,0.2);
}
.phone-btn { background: var(--success); color: #fff; }
.chat-btn { background: var(--gradient); color: #fff; }
.float-btn:hover { transform: scale(1.1); }

/* ===== AOS 动画 ===== */
[data-aos] { opacity: 0; transform: translateY(24px); transition: opacity 0.6s ease, transform 0.6s ease; }
[data-aos="fade-right"] { transform: translateX(-24px); }
[data-aos="fade-left"] { transform: translateX(24px); }
[data-aos="zoom-in"] { transform: scale(0.9); }
[data-aos].aos-animate { opacity: 1 !important; transform: none !important; }

/* ===== 响应式 ===== */
@media (max-width: 1100px) {
  .product-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: repeat(3, 1fr); }
  .industry-grid { grid-template-columns: repeat(4, 1fr); }
  .features-center { display: none; }
  .features-layout { gap: 20px; }
}
@media (max-width: 900px) {
  .nav { display: none; }
  .header-actions .btn-primary,
  .header-actions .btn-outline { display: none; }
  .menu-toggle { display: flex; }
  .mobile-nav { display: block; }
  .header-actions { gap: 8px; }
  .banner-content { flex-direction: column; gap: 40px; padding: 40px 24px; }
  .banner-title { font-size: 34px; }
  .cases-grid { grid-template-columns: 1fr; }
  .contact-layout { grid-template-columns: 1fr; gap: 32px; }
  .footer-top { flex-direction: column; gap: 32px; }
  .footer-brand { width: 100%; }
  .pricing-grid { grid-template-columns: 1fr; }
  .pricing-card--popular { transform: none; }
  .pricing-card--popular:hover { transform: translateY(-6px); }
}
@media (max-width: 680px) {
  .section { padding: 56px 0; }
  .section-title { font-size: 24px; }
  .banner-title { font-size: 28px; }
  .banner-btns { flex-direction: column; align-items: flex-start; }
  .b-stat strong { font-size: 22px; }
  .product-grid { grid-template-columns: 1fr; }
  .features-layout { flex-direction: column; }
  .features-left, .features-right { width: 100%; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .industry-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-links { flex-direction: column; gap: 24px; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .banner-visual { width: 100%; display: flex; justify-content: center; }
  .phone-mockup { width: 240px; }
  .fc1, .fc2, .fc3 { display: none; }
  .form-row { grid-template-columns: 1fr; }
  .pricing-list { padding: 20px 18px; }
  .form-card { padding: 24px 18px; }
}
@media (max-width: 400px) {
  .container { padding: 0 16px; }
  .banner-title { font-size: 24px; }
  .logo-name { font-size: 18px; }
}