/* ============================================
   惠灵顿智能科技 — 前台官网亮色主题
   Light Theme + Blue-Purple Accent
   响应式: Desktop + Tablet + Mobile
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&family=Outfit:wght@400;500;600;700&display=swap');

:root {
  --primary: #3573C5;
  --primary-light: #5A92D9;
  --accent: #A861BD;
  --secondary: #646ACD;
  --gradient: linear-gradient(135deg, #3573C5, #646ACD, #A861BD);
  --gradient-btn: linear-gradient(135deg, #3573C5, #646ACD);

  --bg-page: #F5F7FA;
  --bg-white: #FFFFFF;
  --bg-light: #F0F2F5;
  --bg-hover: #F8F9FB;

  --text-dark: #1A1A2E;
  --text-body: #4A4A68;
  --text-secondary: #6B7280;
  --text-muted: #9CA3AF;

  --border: #E5E7EB;
  --border-light: #F0F0F5;

  --font-display: 'Outfit', 'Montserrat', 'Noto Sans SC', sans-serif;
  --font-body: 'Inter', 'Roboto', 'Noto Sans SC', 'Microsoft YaHei', sans-serif;

  --radius: 12px;
  --radius-sm: 8px;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.1);
}

/* ── Base ── */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  background: #F5F7FA;
  color: #1A1A2E;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  margin: 0;
  padding: 0;
  overflow-x: hidden;
}
a { color: var(--c-primary, #3573C5); text-decoration: none; transition: color 0.2s; }
a:hover { color: #5A92D9; }
img { max-width: 100%; height: auto; }
::selection { background: rgba(53, 115, 197, 0.15); }

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: #F0F0F5; }
::-webkit-scrollbar-thumb { background: #D0D0D8; border-radius: 3px; }

/* ============================================
   NAVIGATION
   ============================================ */
.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 70px;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
  z-index: 1000;
  transition: all 0.3s;
}
.site-nav.scrolled {
  background: rgba(255, 255, 255, 0.95);
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
}
.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}
.nav-logo img { height: 36px; width: auto; }
.nav-logo-text {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  background: linear-gradient(135deg, #3573C5, #A861BD);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: 1px;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav-links a {
  color: #4B5563;
  font-size: 15px;
  font-weight: 500;
  position: relative;
  padding: 4px 0;
  transition: color 0.2s;
}
.nav-links a:hover,
.nav-links a.active {
  color: #3573C5;
}
.nav-links a.active::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(135deg, #3573C5, #A861BD);
  border-radius: 1px;
}

/* Dropdown menu */
.nav-item {
  position: relative;
}
.nav-item.has-dropdown > a {
  display: flex;
  align-items: center;
  gap: 4px;
}
.nav-item.has-dropdown > a::after {
  content: '';
  display: inline-block;
  width: 0;
  height: 0;
  margin-left: 2px;
  vertical-align: middle;
  border-top: 4px solid currentColor;
  border-right: 4px solid transparent;
  border-left: 4px solid transparent;
  transition: transform 0.2s;
}
.nav-item.has-dropdown:hover > a::after {
  transform: rotate(180deg);
}
/* 热桥：填充一级菜单和下拉菜单之间的间隙 */
.nav-item.has-dropdown::before {
  content: '';
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  height: 12px;
  background: transparent;
}
.nav-dropdown {
  display: none;
  position: absolute;
  top: calc(100% + 4px);
  left: 50%;
  transform: translateX(-50%);
  min-width: 180px;
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 10px 40px rgba(0,0,0,0.12);
  border: 1px solid rgba(0,0,0,0.06);
  padding: 8px 0;
  list-style: none;
  margin: 0;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: all 0.15s ease;
}
.nav-item.has-dropdown:hover .nav-dropdown {
  display: block;
  opacity: 1;
  visibility: visible;
}
.nav-dropdown li a {
  display: block;
  padding: 10px 20px;
  color: #374151;
  font-size: 14px;
  font-weight: 500;
  white-space: nowrap;
  transition: all 0.15s ease;
}
.nav-dropdown li a:hover {
  background: #F3F4F6;
  color: #3573C5;
  padding-left: 24px;
}

/* Mobile child link */
.nav-mobile-child {
  padding-left: 24px !important;
  font-size: 14px !important;
  color: #6B7280 !important;
}

/* Mobile hamburger */
.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border: none;
  background: transparent;
  cursor: pointer;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: #1A1A2E;
  border-radius: 1px;
  transition: all 0.3s;
}
.nav-toggle.open span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* Mobile drawer */
.nav-mobile {
  display: none;
  position: fixed;
  top: 70px;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(20px);
  z-index: 999;
  padding: 32px 24px;
}
.nav-mobile.open { display: block; }
.nav-mobile a {
  display: block;
  padding: 16px 0;
  color: #4B5563;
  font-size: 18px;
  font-weight: 500;
  border-bottom: 1px solid var(--border);
  transition: color 0.2s;
}
.nav-mobile a:hover { color: #3573C5; }

/* Navigation Search Button */
.nav-search-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: none;
  background: transparent;
  color: #4A4A68;
  font-size: 18px;
  cursor: pointer;
  border-radius: 8px;
  transition: all 0.2s ease;
  margin-left: 8px;
}
.nav-search-btn:hover {
  background: #F3F4F6;
  color: #3573C5;
}

/* Search Overlay */
.search-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(26, 26, 46, 0.9);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
}
.search-overlay.active {
  opacity: 1;
  visibility: visible;
}
.search-overlay-content {
  width: 90%;
  max-width: 600px;
  position: relative;
  transform: translateY(20px);
  transition: transform 0.3s ease;
}
.search-overlay.active .search-overlay-content {
  transform: translateY(0);
}
.search-form {
  display: flex;
  gap: 12px;
  align-items: center;
}
.search-input {
  flex: 1;
  padding: 16px 20px;
  font-size: 18px;
  font-family: var(--font-body);
  border: 2px solid rgba(255, 255, 255, 0.2);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
  outline: none;
  transition: all 0.2s ease;
}
.search-input::placeholder {
  color: rgba(255, 255, 255, 0.5);
}
.search-input:focus {
  border-color: #3573C5;
  background: rgba(255, 255, 255, 0.15);
}
.search-submit {
  width: 56px;
  height: 56px;
  border: none;
  background: var(--gradient-btn);
  color: #fff;
  font-size: 20px;
  border-radius: 12px;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
}
.search-submit:hover {
  transform: scale(1.05);
  box-shadow: 0 4px 15px rgba(53, 115, 197, 0.4);
}
.search-close {
  position: absolute;
  top: -60px;
  right: 0;
  width: 44px;
  height: 44px;
  border: none;
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
  font-size: 20px;
  border-radius: 50%;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
}
.search-close:hover {
  background: rgba(255, 255, 255, 0.2);
  transform: rotate(90deg);
}

/* Mobile Search */
@media (max-width: 768px) {
  .nav-search-btn {
    width: 36px;
    height: 36px;
    font-size: 16px;
  }
  .search-input {
    font-size: 16px;
    padding: 14px 16px;
  }
  .search-submit {
    width: 48px;
    height: 48px;
    font-size: 18px;
  }
}

/* ============================================
   HERO
   ============================================ */
.hero {
  position: relative;
  height: 100vh;
  height: 100dvh;
  min-height: 600px;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: #E8EDF5;
}
.hero-bg {
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background-size: cover;
  background-position: center;
}
.hero-bg::after {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: linear-gradient(135deg, rgba(232,237,245,0.85) 0%, rgba(232,237,245,0.4) 50%, rgba(232,237,245,0.1) 100%);
}
.hero-content {
  position: relative;
  z-index: 1;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  width: 100%;
}
.hero-subtitle {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 500;
  color: #3573C5;
  letter-spacing: 4px;
  text-transform: uppercase;
  margin-bottom: 16px;
  opacity: 0;
  animation: fadeInUp 0.6s ease-out 0.2s forwards;
}
.hero-line {
  width: 60px; height: 3px;
  background: linear-gradient(135deg, #3573C5, #A861BD);
  border-radius: 2px;
  margin-bottom: 24px;
  opacity: 0;
  animation: expandLine 0.5s ease-out 0.4s forwards;
}
.hero-title {
  font-family: var(--font-display);
  font-size: 48px;
  font-weight: 700;
  color: #1A1A2E;
  line-height: 1.2;
  margin-bottom: 16px;
  max-width: 600px;
  opacity: 0;
  animation: fadeInUp 0.6s ease-out 0.5s forwards;
}
.hero-desc {
  font-size: 17px;
  color: #6B7280;
  max-width: 480px;
  margin-bottom: 40px;
  line-height: 1.7;
  opacity: 0;
  animation: fadeInUp 0.6s ease-out 0.6s forwards;
}
.hero-actions {
  display: flex;
  gap: 16px;
  opacity: 0;
  animation: fadeInUp 0.6s ease-out 0.7s forwards;
}
.hero-scroll {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 1;
  animation: bounce 2s infinite;
}
.hero-scroll i { font-size: 24px; color: #9CA3AF; }
.hero-glow {
  position: absolute;
  width: 600px; height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(53,115,197,0.06) 0%, transparent 70%);
  top: -200px; right: -100px;
  z-index: 0;
  pointer-events: none;
}

/* Buttons */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  background: linear-gradient(135deg, #3573C5, #646ACD);
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.3s;
  text-decoration: none;
}
.btn-primary:hover {
  filter: brightness(1.08);
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(53, 115, 197, 0.25);
  color: #fff;
}
.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  background: transparent;
  color: #1A1A2E;
  font-size: 15px;
  font-weight: 500;
  border: 1px solid #D0D5DD;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.3s;
  text-decoration: none;
}
.btn-outline:hover {
  border-color: #3573C5;
  color: #3573C5;
  background: rgba(53, 115, 197, 0.04);
}

/* ============================================
   SECTION COMMON
   ============================================ */
.section {
  padding: 100px 24px;
  max-width: 1200px;
  margin: 0 auto;
}
.section-alt {
  background: #FFFFFF;
  padding: 100px 0;
}
.section-alt .section-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}
.section-header {
  text-align: center;
  margin-bottom: 60px;
}
.section-title {
  font-family: var(--font-display);
  font-size: 32px;
  font-weight: 700;
  color: #1A1A2E;
  margin-bottom: 16px;
}
.section-line {
  width: 60px; height: 3px;
  background: linear-gradient(135deg, #3573C5, #A861BD);
  border-radius: 2px;
  margin: 0 auto;
}
.section-desc {
  font-size: 16px;
  color: #6B7280;
  margin-top: 16px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* ============================================
   PRODUCT CARDS
   ============================================ */
.product-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.product-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: all 0.3s;
  cursor: pointer;
  text-decoration: none;
  color: inherit;
  display: block;
}
.product-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(53, 115, 197, 0.3);
  color: inherit;
}
.product-card-img {
  width: 100%;
  aspect-ratio: 4/3;
  overflow: hidden;
  background: #F5F7FA;
  display: flex;
  align-items: center;
  justify-content: center;
}
.product-card-img img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  transition: transform 0.4s;
  padding: 12px;
}
.product-card:hover .product-card-img img { transform: scale(1.05); }
.product-card-body { padding: 20px; }
.product-card-title {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 600;
  color: #1A1A2E;
  margin-bottom: 8px;
}
.product-card-desc {
  font-size: 14px;
  color: #6B7280;
  margin-bottom: 16px;
  line-height: 1.5;
}
.product-card-link {
  font-size: 14px;
  color: #3573C5;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: gap 0.2s;
}
.product-card:hover .product-card-link { gap: 8px; }

/* ============================================
   SOLUTIONS
   ============================================ */
.solution-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.solution-card {
  position: relative;
  height: 320px;
  border-radius: var(--radius);
  overflow: hidden;
  cursor: pointer;
}
.solution-card-bg {
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background-size: cover;
  background-position: center;
  transition: transform 0.5s;
}
.solution-card:hover .solution-card-bg { transform: scale(1.08); }
.solution-card-overlay {
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: linear-gradient(180deg, rgba(0,0,0,0.1) 0%, rgba(0,0,0,0.6) 100%);
  transition: background 0.3s;
}
.solution-card:hover .solution-card-overlay {
  background: linear-gradient(180deg, rgba(0,0,0,0.05) 0%, rgba(0,0,0,0.5) 100%);
}
.solution-card-content {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  padding: 32px;
  z-index: 1;
}
.solution-card-icon {
  font-size: 32px;
  margin-bottom: 12px;
  color: rgba(255,255,255,0.9);
}
.solution-card-title {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 600;
  color: #fff;
  margin-bottom: 8px;
}
.solution-card-desc {
  font-size: 14px;
  color: rgba(255,255,255,0.75);
}

/* ============================================
   ABOUT
   ============================================ */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}
.about-image {
  border-radius: var(--radius);
  overflow: hidden;
  position: relative;
}
.about-image img {
  width: 100%;
  display: block;
  border-radius: var(--radius);
}
.about-text .section-title {
  text-align: left;
  margin-bottom: 20px;
}
.about-text p {
  font-size: 15px;
  color: #6B7280;
  line-height: 1.8;
  margin-bottom: 32px;
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-top: 40px;
}
.stat-item { text-align: center; }
.stat-number {
  font-family: var(--font-display);
  font-size: 36px;
  font-weight: 700;
  background: linear-gradient(135deg, #3573C5, #A861BD);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
}
.stat-label {
  font-size: 14px;
  color: #6B7280;
  margin-top: 4px;
}

/* ============================================
   NEWS
   ============================================ */
.news-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.news-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: all 0.3s;
  cursor: pointer;
  text-decoration: none;
  color: inherit;
  display: block;
}
.news-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  color: inherit;
}
.news-card-img {
  width: 100%;
  aspect-ratio: 16/10;
  overflow: hidden;
  background: #F5F7FA;
}
.news-card-img img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform 0.4s;
}
.news-card:hover .news-card-img img { transform: scale(1.05); }
.news-card-body { padding: 20px; }
.news-card-tag {
  display: inline-block;
  padding: 3px 12px;
  background: rgba(53, 115, 197, 0.08);
  color: #3573C5;
  font-size: 12px;
  font-weight: 500;
  border-radius: 20px;
  margin-bottom: 12px;
}
.news-card-title {
  font-size: 16px;
  font-weight: 600;
  color: #1A1A2E;
  margin-bottom: 8px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.news-card-date {
  font-size: 13px;
  color: #9CA3AF;
}

/* ============================================
   PARTNERS
   ============================================ */
.partners-section {
  background: #FFFFFF;
  padding: 80px 0;
  overflow: hidden;
}
.partners-track {
  display: flex;
  gap: 60px;
  animation: scroll 20s linear infinite;
  width: max-content;
}
.partner-logo {
  height: 40px;
  width: auto;
  opacity: 0.4;
  filter: grayscale(100%);
  transition: all 0.3s;
  flex-shrink: 0;
}
.partner-logo:hover {
  opacity: 0.8;
  filter: grayscale(0%);
}
@keyframes scroll {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

/* ============================================
   CTA
   ============================================ */
.cta-section {
  padding: 100px 24px;
  background: linear-gradient(135deg, #3573C5, #646ACD, #A861BD);
  text-align: center;
  position: relative;
  overflow: hidden;
}
.cta-section::before {
  content: '';
  position: absolute;
  top: -50%; left: -50%;
  width: 200%; height: 200%;
  background: radial-gradient(circle at 30% 50%, rgba(255,255,255,0.08) 0%, transparent 50%);
  pointer-events: none;
}
.cta-title {
  font-family: var(--font-display);
  font-size: 36px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 16px;
  position: relative;
  z-index: 1;
}
.cta-desc {
  font-size: 17px;
  color: rgba(255,255,255,0.85);
  margin-bottom: 32px;
  position: relative;
  z-index: 1;
}
.cta-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 16px 40px;
  background: #fff;
  color: #3573C5;
  font-size: 16px;
  font-weight: 600;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.3s;
  text-decoration: none;
  position: relative;
  z-index: 1;
}
.cta-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.2);
  color: #3573C5;
}

/* ============================================
   FOOTER
   ============================================ */
.site-footer {
  background: #1A1A2E;
  padding: 60px 0 0;
  border-top: none;
}
.footer-grid {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
  gap: 40px;
}
.footer-brand-desc {
  font-size: 14px;
  color: #9CA3AF;
  line-height: 1.7;
  margin-top: 16px;
}
.footer-title {
  font-size: 16px;
  font-weight: 600;
  color: #F3F4F6;
  margin-bottom: 20px;
}
.footer-links {
  list-style: none;
  padding: 0;
  margin: 0;
}
.footer-links li { margin-bottom: 10px; }
.footer-links a {
  font-size: 14px;
  color: #9CA3AF;
  transition: color 0.2s;
}
.footer-links a:hover { color: #D0D5FF; }
.footer-contact-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-bottom: 14px;
  font-size: 14px;
  color: #9CA3AF;
}
.footer-contact-item i {
  color: #3573C5;
  margin-top: 3px;
  width: 16px;
  text-align: center;
}
.footer-bottom {
  max-width: 1200px;
  margin: 40px auto 0;
  padding: 20px 24px;
  border-top: 1px solid rgba(255,255,255,0.08);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 13px;
  color: #6B7280;
}
.footer-bottom a { color: #6B7280; }
.footer-bottom a:hover { color: #9CA3AF; }

/* Mobile bottom tab bar */
.footer-tabbar {
  display: none;
  position: fixed;
  bottom: 0; left: 0; right: 0;
  height: 60px;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-top: 1px solid var(--border);
  z-index: 999;
  padding-bottom: env(safe-area-inset-bottom);
}
.footer-tabbar-grid {
  display: flex;
  height: 100%;
}
.footer-tab-item {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3px;
  color: #9CA3AF;
  text-decoration: none;
  font-size: 11px;
  transition: color 0.2s;
  min-height: 48px;
  -webkit-tap-highlight-color: transparent;
}
.footer-tab-item i { font-size: 20px; }
.footer-tab-item.active,
.footer-tab-item:hover { color: #3573C5; }

/* ============================================
   INNER PAGE LAYOUT (产品/新闻/关于等)
   ============================================ */
.page-banner {
  position: relative;
  height: 300px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-size: cover;
  background-position: center;
  margin-top: 70px;
}
.page-banner::after {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: linear-gradient(135deg, rgba(53,115,197,0.85), rgba(168,97,189,0.75));
}
.page-banner-title {
  position: relative;
  z-index: 1;
  font-family: var(--font-display);
  font-size: 36px;
  font-weight: 700;
  color: #fff;
}
.page-breadcrumb-wrap {
  max-width: 1200px;
  margin: 0 auto;
  padding: 16px 24px;
}
.page-layout {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px 60px;
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 32px;
}
.page-sidebar {
  position: sticky;
  top: 90px;
  align-self: start;
}
.sidebar-widget {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 20px;
}
.sidebar-widget-title {
  font-size: 16px;
  font-weight: 600;
  color: #1A1A2E;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-light);
}
.sidebar-link {
  display: block;
  padding: 8px 12px;
  color: #4B5563;
  font-size: 14px;
  border-radius: var(--radius-sm);
  transition: all 0.2s;
  margin-bottom: 2px;
}
.sidebar-link:hover {
  background: rgba(53, 115, 197, 0.06);
  color: #3573C5;
}
.sidebar-link.active {
  background: rgba(53, 115, 197, 0.08);
  color: #3573C5;
  font-weight: 500;
}
.page-main {
  min-width: 0;
}
.page-main-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
}

/* Breadcrumb */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: #9CA3AF;
}
.breadcrumb a { color: #6B7280; }
.breadcrumb a:hover { color: #3573C5; }
.breadcrumb-sep { color: #D0D5DD; }

/* Article */
.article-header {
  margin-bottom: 32px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-light);
}
.article-title {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 700;
  color: #1A1A2E;
  margin-bottom: 12px;
}
.article-meta {
  display: flex;
  gap: 20px;
  font-size: 14px;
  color: #9CA3AF;
}
.article-content {
  font-size: 16px;
  line-height: 1.8;
  color: #374151;
}
.article-content img {
  max-width: 100%;
  border-radius: var(--radius-sm);
  margin: 16px 0;
}

/* Product Detail */
.product-detail-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
}
.product-detail-img {
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}
.product-detail-img img {
  width: 100%;
  display: block;
  transition: transform 0.4s ease;
}
.product-detail-img:hover img {
  transform: scale(1.02);
}

/* Product Params - Elegant Card Design */
.product-detail-params {
  margin-top: 28px;
  background: linear-gradient(135deg, #f8f9fc 0%, #f0f2f8 100%);
  border-radius: var(--radius);
  padding: 24px;
  border: 1px solid rgba(53, 115, 197, 0.08);
  position: relative;
  overflow: hidden;
}
.product-detail-params::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--gradient);
  border-radius: 2px 0 0 2px;
}
.product-detail-params h3 {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 600;
  color: var(--text-dark);
  margin: 0 0 20px 0;
  padding-left: 12px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.product-detail-params h3::before {
  content: '';
  display: inline-block;
  width: 8px;
  height: 8px;
  background: var(--primary);
  border-radius: 50%;
  box-shadow: 0 0 0 3px rgba(53, 115, 197, 0.2);
}

.param-list {
  display: grid;
  gap: 0;
}
.param-row {
  display: grid;
  grid-template-columns: 140px 1fr;
  align-items: center;
  padding: 14px 16px;
  background: rgba(255, 255, 255, 0.7);
  border-radius: var(--radius-sm);
  margin-bottom: 2px;
  transition: all 0.25s ease;
  border: 1px solid transparent;
}
.param-row:hover {
  background: rgba(255, 255, 255, 0.95);
  border-color: rgba(53, 115, 197, 0.12);
  box-shadow: 0 2px 8px rgba(53, 115, 197, 0.06);
  transform: translateX(4px);
}
.param-row:last-child {
  margin-bottom: 0;
}
.param-label {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  letter-spacing: 0.02em;
  position: relative;
  padding-left: 14px;
}
.param-label::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 4px;
  background: var(--accent);
  border-radius: 50%;
}
.param-value {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-dark);
  letter-spacing: 0.01em;
}

/* Mobile Responsive */
@media (max-width: 768px) {
  .param-row {
    grid-template-columns: 120px 1fr;
    padding: 12px 14px;
  }
  .param-label {
    font-size: 12px;
  }
  .param-value {
    font-size: 13px;
  }
}

/* Related products */
.related-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 40px;
}

/* News list item */
.news-list-item {
  display: flex;
  gap: 20px;
  padding: 20px 0;
  border-bottom: 1px solid var(--border-light);
  transition: background 0.2s;
  text-decoration: none;
  color: inherit;
}
.news-list-item:hover { color: inherit; }
.news-list-img {
  width: 180px;
  height: 120px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  flex-shrink: 0;
  background: #F5F7FA;
}
.news-list-img img {
  width: 100%; height: 100%;
  object-fit: cover;
}
.news-list-info { flex: 1; min-width: 0; }
.news-list-title {
  font-size: 18px;
  font-weight: 600;
  color: #1A1A2E;
  margin-bottom: 8px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.news-list-desc {
  font-size: 14px;
  color: #6B7280;
  margin-bottom: 12px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.news-list-meta {
  font-size: 13px;
  color: #9CA3AF;
  display: flex;
  gap: 16px;
}

/* Form */
.form-group {
  margin-bottom: 20px;
}
.form-label {
  display: block;
  font-size: 14px;
  font-weight: 500;
  color: #374151;
  margin-bottom: 8px;
}
.form-input,
.form-textarea {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 15px;
  color: #1A1A2E;
  background: #fff;
  transition: border-color 0.2s, box-shadow 0.2s;
  font-family: var(--font-body);
}
.form-input:focus,
.form-textarea:focus {
  outline: none;
  border-color: #3573C5;
  box-shadow: 0 0 0 3px rgba(53, 115, 197, 0.1);
}
.form-textarea {
  min-height: 120px;
  resize: vertical;
}

/* Pagination */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-top: 40px;
}
.page-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  height: 40px;
  padding: 0 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: #fff;
  color: #4B5563;
  font-size: 14px;
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
}
.page-btn:hover {
  border-color: #3573C5;
  color: #3573C5;
}
.page-btn.active {
  background: #3573C5;
  border-color: #3573C5;
  color: #fff;
}

/* Sidebar - hot words */
.hot-words {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.hot-word {
  display: inline-block;
  padding: 4px 12px;
  background: rgba(53, 115, 197, 0.06);
  color: #3573C5;
  font-size: 13px;
  border-radius: 20px;
  text-decoration: none;
  transition: all 0.2s;
}
.hot-word:hover {
  background: #3573C5;
  color: #fff;
}

/* ============================================
   ANIMATIONS
   ============================================ */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes expandLine {
  from { opacity: 0; width: 0; }
  to { opacity: 1; width: 60px; }
}
@keyframes bounce {
  0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
  40% { transform: translateX(-50%) translateY(-8px); }
  60% { transform: translateX(-50%) translateY(-4px); }
}

/* Scroll reveal */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}
.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ============================================
   RESPONSIVE — Tablet
   ============================================ */
@media (max-width: 1024px) {
  .product-grid { grid-template-columns: repeat(2, 1fr); }
  .solution-grid { grid-template-columns: repeat(2, 1fr); }
  .solution-card { height: 260px; }
  .about-grid { grid-template-columns: 1fr; gap: 40px; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 32px; }
  .news-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
  .page-layout { grid-template-columns: 1fr; }
  .page-sidebar { position: static; }
  .product-detail-grid { grid-template-columns: 1fr; }
  .related-grid { grid-template-columns: repeat(2, 1fr); }
}

/* ============================================
   RESPONSIVE — Mobile
   ============================================ */
@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-toggle { display: flex; }

  .hero { height: 85vh; min-height: 500px; }
  .hero-title { font-size: 28px; }
  .hero-desc { font-size: 15px; }
  .hero-actions { flex-direction: column; gap: 12px; }
  .btn-primary, .btn-outline { width: 100%; justify-content: center; padding: 14px 24px; }
  .hero-scroll { display: none; }

  .section { padding: 60px 16px; }
  .section-alt { padding: 60px 0; }
  .section-alt .section-inner { padding: 0 16px; }
  .section-title { font-size: 24px; }
  .section-header { margin-bottom: 40px; }

  .product-grid { grid-template-columns: 1fr; gap: 16px; }
  .product-card-body { padding: 16px; }

  .solution-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
  .solution-card { height: 200px; }
  .solution-card-content { padding: 20px; }
  .solution-card-title { font-size: 16px; }

  .about-grid { gap: 24px; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 24px; }
  .stat-number { font-size: 28px; }

  .news-grid { grid-template-columns: 1fr; gap: 16px; }

  .cta-section { padding: 60px 16px; }
  .cta-title { font-size: 24px; }
  .cta-desc { font-size: 15px; }

  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }
  .footer-tabbar { display: block; }
  body { padding-bottom: 60px; }

  .page-banner { height: 200px; }
  .page-banner-title { font-size: 24px; }
  .page-layout { padding: 0 16px 60px; gap: 20px; }
  .page-main-card { padding: 20px; }
  .news-list-item { flex-direction: column; }
  .news-list-img { width: 100%; height: 180px; }
  .related-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 480px) {
  .hero-title { font-size: 24px; }
  .section-title { font-size: 22px; }
  .solution-grid { grid-template-columns: 1fr; }
  .solution-card { height: 180px; }
}