/* ===== 全局重置与基础样式 ===== */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --primary: #1a5276;
  --primary-light: #2e86c1;
  --primary-dark: #0e2f44;
  --accent: #e74c3c;
  --accent-light: #f1948a;
  --bg: #ffffff;
  --bg-alt: #f8f9fa;
  --text: #333333;
  --text-light: #555555;
  --text-muted: #7f8c8d;
  --card-bg: #ffffff;
  --card-shadow: 0 4px 20px rgba(0,0,0,0.06);
  --card-shadow-hover: 0 8px 30px rgba(0,0,0,0.1);
  --border-color: #e0e0e0;
  --glass-bg: rgba(255,255,255,0.9);
  --glass-blur: 10px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-full: 30px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --transition: 0.3s ease;
  --transition-slow: 0.5s ease;
}

[data-theme="dark"] {
  --primary: #5dade2;
  --primary-light: #85c1e9;
  --primary-dark: #1a5276;
  --accent: #f1948a;
  --accent-light: #e74c3c;
  --bg: #121212;
  --bg-alt: #1e1e1e;
  --text: #e0e0e0;
  --text-light: #cccccc;
  --text-muted: #95a5a6;
  --card-bg: #2c2c2c;
  --card-shadow: 0 4px 20px rgba(0,0,0,0.3);
  --card-shadow-hover: 0 8px 30px rgba(0,0,0,0.4);
  --border-color: #444444;
  --glass-bg: rgba(18,18,18,0.9);
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
  transition: background var(--transition-slow), color var(--transition-slow);
}

/* ===== 容器 ===== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ===== 通用section ===== */
.section {
  padding: 80px 0;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.section.visible {
  opacity: 1;
  transform: translateY(0);
}

.section-title {
  text-align: center;
  font-size: 2rem;
  margin-bottom: 0.5rem;
  color: var(--primary);
  position: relative;
  font-weight: 700;
}

.section-title .subtitle {
  display: block;
  font-size: 0.9rem;
  font-weight: 300;
  color: var(--text-muted);
  margin-top: 0.2rem;
  text-transform: uppercase;
  letter-spacing: 2px;
}

/* ===== 导航栏 ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  box-shadow: 0 2px 20px rgba(0,0,0,0.1);
  transition: background var(--transition-slow);
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  height: 70px;
}

.nav-logo {
  display: flex;
  align-items: center;
  text-decoration: none;
}

.nav-logo svg {
  display: block;
  height: 50px;
  width: auto;
}

.nav-menu {
  list-style: none;
  display: flex;
  gap: 0.5rem;
  margin: 0;
  padding: 0;
}

.nav-menu li {
  margin: 0;
}

.nav-link {
  text-decoration: none;
  color: var(--text);
  padding: 0.5rem 1rem;
  border-radius: 20px;
  font-size: 0.9rem;
  transition: all var(--transition);
  font-weight: 500;
  white-space: nowrap;
}

.nav-link:hover,
.nav-link.active {
  background: var(--primary);
  color: #fff;
}

.nav-actions {
  display: flex;
  gap: 0.5rem;
  align-items: center;
}

.search-toggle,
.theme-toggle,
.mobile-menu-toggle {
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  border-radius: 50%;
  transition: background var(--transition);
  color: var(--text);
  display: flex;
  align-items: center;
  justify-content: center;
}

.search-toggle:hover,
.theme-toggle:hover,
.mobile-menu-toggle:hover {
  background: rgba(0,0,0,0.1);
}

[data-theme="dark"] .search-toggle:hover,
[data-theme="dark"] .theme-toggle:hover,
[data-theme="dark"] .mobile-menu-toggle:hover {
  background: rgba(255,255,255,0.1);
}

.mobile-menu-toggle {
  display: none;
}

/* 搜索覆盖层 */
.search-overlay {
  display: none;
  position: fixed;
  top: 70px;
  left: 0;
  right: 0;
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  padding: 20px;
  z-index: 999;
  box-shadow: 0 4px 20px rgba(0,0,0,0.1);
}

.search-overlay.active {
  display: block;
  animation: slideDown 0.3s ease;
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: translateY(0); }
}

.search-box {
  display: flex;
  gap: 10px;
  max-width: 600px;
  margin: 0 auto;
}

.search-box input {
  flex: 1;
  padding: 12px 20px;
  border: 2px solid var(--primary);
  border-radius: var(--radius-full);
  font-size: 1rem;
  outline: none;
  background: var(--bg);
  color: var(--text);
  transition: border-color var(--transition);
}

.search-box input:focus {
  border-color: var(--primary-light);
  box-shadow: 0 0 0 3px rgba(26,82,118,0.15);
}

.search-box button {
  padding: 12px 24px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff;
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  font-weight: 600;
  transition: transform var(--transition), box-shadow var(--transition);
}

.search-box button:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 15px rgba(26,82,118,0.3);
}

.search-box .search-close {
  background: transparent;
  color: var(--text);
  padding: 12px;
  font-size: 1.2rem;
  line-height: 1;
}

/* ===== Hero Banner ===== */
.hero-banner {
  margin-top: 70px;
  min-height: 500px;
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, #e8f4f8 0%, #d4e6f1 50%, #e8f4f8 100%);
}

[data-theme="dark"] .hero-banner {
  background: linear-gradient(135deg, #0a1628 0%, #1a2a3a 50%, #0a1628 100%);
}

.banner-slider {
  position: relative;
}

.banner-slide {
  display: none;
  align-items: center;
  justify-content: center;
  padding: 60px 20px;
  min-height: 500px;
  opacity: 0;
  transition: opacity 0.8s ease;
}

.banner-slide.active {
  display: flex;
  opacity: 1;
}

.banner-content {
  flex: 1;
  max-width: 600px;
  padding-right: 40px;
}

.banner-content h1,
.banner-content h2 {
  font-size: 2.5rem;
  color: var(--primary);
  margin-bottom: 1rem;
  font-weight: 800;
  line-height: 1.2;
}

.banner-content p {
  font-size: 1.1rem;
  color: var(--text-light);
  margin-bottom: 2rem;
  line-height: 1.7;
}

.banner-btn {
  display: inline-block;
  padding: 14px 36px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff;
  text-decoration: none;
  border-radius: var(--radius-full);
  font-weight: 600;
  transition: transform var(--transition), box-shadow var(--transition);
  box-shadow: 0 4px 15px rgba(26,82,118,0.2);
}

.banner-btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 25px rgba(26,82,118,0.35);
}

.banner-visual {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: center;
}

.banner-visual svg {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  box-shadow: 0 10px 40px rgba(0,0,0,0.1);
}

.banner-controls {
  position: absolute;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 15px;
  align-items: center;
}

.banner-prev,
.banner-next {
  background: var(--glass-bg);
  backdrop-filter: blur(5px);
  border: none;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  font-size: 1.5rem;
  cursor: pointer;
  transition: all var(--transition);
  color: var(--text);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.banner-prev:hover,
.banner-next:hover {
  background: var(--primary);
  color: #fff;
  transform: scale(1.05);
}

.banner-dots {
  display: flex;
  gap: 8px;
}

.dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--border-color);
  cursor: pointer;
  transition: all var(--transition);
}

.dot.active {
  background: var(--primary);
  transform: scale(1.2);
}

/* ===== Breadcrumb ===== */
.breadcrumb {
  background: var(--bg-alt);
  padding: 10px 0;
  transition: background var(--transition-slow);
}

.breadcrumb ol {
  list-style: none;
  display: flex;
  gap: 10px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  font-size: 0.9rem;
}

.breadcrumb a {
  color: var(--primary);
  text-decoration: none;
  transition: color var(--transition);
}

.breadcrumb a:hover {
  text-decoration: underline;
}

/* ===== About Section ===== */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 50px;
  align-items: center;
}

.about-text p {
  margin-bottom: 1rem;
  line-height: 1.8;
}

.about-text strong {
  color: var(--primary);
}

.about-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  margin-top: 20px;
  padding: 20px 25px;
  background: var(--bg-alt);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
}

.about-meta span {
  font-size: 0.95rem;
}

.about-visual svg {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  box-shadow: 0 10px 40px rgba(0,0,0,0.08);
}

/* ===== Brand Story ===== */
.brand-story-section {
  background: var(--bg-alt);
}

.story-content {
  max-width: 900px;
  margin: 0 auto;
}

.story-content p {
  margin-bottom: 1.2rem;
  line-height: 1.8;
  font-size: 1.05rem;
}

/* ===== Culture Section ===== */
.culture-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.culture-card {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  padding: 35px 25px;
  text-align: center;
  box-shadow: var(--card-shadow);
  transition: transform var(--transition), box-shadow var(--transition);
  border: 1px solid transparent;
}

.culture-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--card-shadow-hover);
  border-color: var(--primary);
}

.culture-card svg {
  margin-bottom: 15px;
  display: inline-block;
}

.culture-card h3 {
  margin-bottom: 10px;
  color: var(--primary);
  font-size: 1.2rem;
}

/* ===== Products Section ===== */
.products-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 30px;
}

.product-card {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  padding: 30px 20px;
  text-align: center;
  box-shadow: var(--card-shadow);
  transition: transform var(--transition), box-shadow var(--transition);
  border: 1px solid transparent;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease, box-shadow 0.3s, border-color 0.3s;
}

.section.visible .product-card {
  opacity: 1;
  transform: translateY(0);
}

.product-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--card-shadow-hover);
  border-color: var(--primary-light);
}

.product-image svg {
  max-width: 100%;
  height: auto;
  margin-bottom: 15px;
}

.product-card h3 {
  margin-bottom: 10px;
  color: var(--primary);
  font-size: 1.15rem;
}

.product-card p {
  font-size: 0.95rem;
  color: var(--text-light);
  line-height: 1.6;
}

/* ===== Advantages Section ===== */
.advantages-section {
  background: var(--bg-alt);
}

.advantages-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.advantage-card {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  padding: 35px 25px;
  text-align: center;
  box-shadow: var(--card-shadow);
  transition: transform var(--transition), box-shadow var(--transition);
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease, box-shadow 0.3s;
}

.section.visible .advantage-card {
  opacity: 1;
  transform: translateY(0);
}

.advantage-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--card-shadow-hover);
}

.advantage-card svg {
  margin-bottom: 15px;
}

.advantage-card h3 {
  margin-bottom: 10px;
  color: var(--primary);
  font-size: 1.2rem;
}

.advantage-card p {
  font-size: 0.95rem;
  color: var(--text-light);
  line-height: 1.6;
}

/* ===== Services Section ===== */
.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.service-card {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  padding: 35px 25px;
  text-align: center;
  box-shadow: var(--card-shadow);
  transition: transform var(--transition), box-shadow var(--transition);
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease, box-shadow 0.3s;
}

.section.visible .service-card {
  opacity: 1;
  transform: translateY(0);
}

.service-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--card-shadow-hover);
}

.service-card svg {
  margin-bottom: 15px;
}

.service-card h3 {
  margin-bottom: 10px;
  color: var(--primary);
  font-size: 1.2rem;
}

.service-card p {
  font-size: 0.95rem;
  color: var(--text-light);
  line-height: 1.6;
}

/* ===== Solutions Section ===== */
.solutions-section {
  background: var(--bg-alt);
}

.solutions-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.solution-card {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  padding: 35px 25px;
  text-align: center;
  box-shadow: var(--card-shadow);
  transition: transform var(--transition), box-shadow var(--transition);
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease, box-shadow 0.3s;
}

.section.visible .solution-card {
  opacity: 1;
  transform: translateY(0);
}

.solution-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--card-shadow-hover);
}

.solution-card svg {
  margin-bottom: 15px;
}

.solution-card h3 {
  margin-bottom: 10px;
  color: var(--primary);
  font-size: 1.2rem;
}

.solution-card p {
  font-size: 0.95rem;
  color: var(--text-light);
  line-height: 1.6;
}

/* ===== Scenarios Section ===== */
.scenarios-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.scenario-card {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  padding: 30px 25px;
  text-align: center;
  box-shadow: var(--card-shadow);
  transition: transform var(--transition), box-shadow var(--transition);
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease, box-shadow 0.3s;
}

.section.visible .scenario-card {
  opacity: 1;
  transform: translateY(0);
}

.scenario-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--card-shadow-hover);
}

.scenario-card svg {
  margin-bottom: 15px;
}

.scenario-card h3 {
  margin-bottom: 10px;
  color: var(--primary);
  font-size: 1.15rem;
}

.scenario-card p {
  font-size: 0.95rem;
  color: var(--text-light);
  line-height: 1.6;
}

/* ===== Data Section ===== */
.data-section {
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff;
}

.data-section .section-title {
  color: #fff;
}

.data-section .section-title .subtitle {
  color: rgba(255,255,255,0.7);
}

.data-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 30px;
}

.data-card {
  background: rgba(255,255,255,0.15);
  backdrop-filter: blur(5px);
  border-radius: var(--radius-lg);
  padding: 40px 20px;
  text-align: center;
  color: #fff;
  transition: transform var(--transition), background var(--transition);
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease, background 0.3s;
}

.section.visible .data-card {
  opacity: 1;
  transform: translateY(0);
}

.data-card:hover {
  transform: translateY(-5px);
  background: rgba(255,255,255,0.25);
}

.data-number {
  font-size: 2.8rem;
  font-weight: bold;
  display: inline;
  line-height: 1;
}

.data-unit {
  font-size: 1.5rem;
  font-weight: bold;
  margin-left: 2px;
}

.data-card p {
  margin-top: 10px;
  font-size: 1rem;
  opacity: 0.9;
}

/* ===== Cases Section ===== */
.cases-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.case-card {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--card-shadow);
  transition: transform var(--transition), box-shadow var(--transition);
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease, box-shadow 0.3s;
}

.section.visible .case-card {
  opacity: 1;
  transform: translateY(0);
}

.case-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--card-shadow-hover);
}

.case-image svg {
  width: 100%;
  height: auto;
  display: block;
}

.case-card h3 {
  padding: 18px 20px 0;
  margin: 0;
  color: var(--primary);
  font-size: 1.1rem;
}

.case-card p {
  padding: 10px 20px 20px;
  font-size: 0.95rem;
  color: var(--text-light);
  line-height: 1.6;
}

/* ===== Clients Section ===== */
.clients-section {
  background: var(--bg-alt);
}

.clients-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 20px;
}

.client-logo svg {
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  transition: transform var(--transition), box-shadow var(--transition);
}

.client-logo svg:hover {
  transform: scale(1.05);
  box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

/* ===== Testimonials Section ===== */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.testimonial-card {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  padding: 30px 25px;
  box-shadow: var(--card-shadow);
  transition: transform var(--transition), box-shadow var(--transition);
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease, box-shadow 0.3s;
}

.section.visible .testimonial-card {
  opacity: 1;
  transform: translateY(0);
}

.testimonial-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--card-shadow-hover);
}

.testimonial-stars {
  color: #f1c40f;
  font-size: 1.2rem;
  margin-bottom: 12px;
  letter-spacing: 2px;
}

.testimonial-card p {
  font-style: italic;
  line-height: 1.7;
  color: var(--text-light);
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 18px;
}

.testimonial-author svg {
  flex-shrink: 0;
  border-radius: 50%;
}

.testimonial-author strong {
  display: block;
  color: var(--primary);
  font-size: 0.95rem;
}

.testimonial-author span {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ===== News Section ===== */
.news-section {
  background: var(--bg-alt);
}

.news-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.news-card {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--card-shadow);
  transition: transform var(--transition), box-shadow var(--transition);
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease, box-shadow 0.3s;
}

.section.visible .news-card {
  opacity: 1;
  transform: translateY(0);
}

.news-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--card-shadow-hover);
}

.news-image svg {
  width: 100%;
  height: auto;
  display: block;
}

.news-meta {
  padding: 18px 20px 0;
  font-size: 0.85rem;
  color: var(--text-muted);
  display: flex;
  gap: 15px;
}

.news-card h3 {
  padding: 10px 20px 0;
  margin: 0;
  font-size: 1.1rem;
  color: var(--primary);
  line-height: 1.4;
}

.news-card p {
  padding: 10px 20px;
  font-size: 0.95rem;
  color: var(--text-light);
  line-height: 1.6;
}

.news-readmore {
  display: inline-block;
  margin: 0 20px 20px;
  color: var(--primary);
  text-decoration: none;
  font-weight: 600;
  transition: color var(--transition), transform var(--transition);
}

.news-readmore:hover {
  color: var(--primary-light);
  transform: translateX(3px);
}

/* ===== Latest Section ===== */
.latest-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.latest-card {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  padding: 25px;
  box-shadow: var(--card-shadow);
  transition: transform var(--transition), box-shadow var(--transition);
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease, box-shadow 0.3s;
}

.section.visible .latest-card {
  opacity: 1;
  transform: translateY(0);
}

.latest-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--card-shadow-hover);
}

.latest-card h3 {
  margin-top: 0;
  font-size: 1.1rem;
  color: var(--primary);
  margin-bottom: 10px;
}

.latest-card p {
  font-size: 0.95rem;
  color: var(--text-light);
  line-height: 1.6;
  margin-bottom: 12px;
}

.latest-card time {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ===== FAQ Section ===== */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  border-bottom: 1px solid var(--border-color);
  transition: border-color var(--transition-slow);
}

.faq-question {
  width: 100%;
  background: none;
  border: none;
  padding: 20px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 1rem;
  cursor: pointer;
  text-align: left;
  color: var(--text);
  font-weight: 600;
  transition: color var(--transition);
}

.faq-question:hover {
  color: var(--primary);
}

.faq-question span:first-child {
  flex: 1;
  padding-right: 10px;
}

.faq-icon {
  font-size: 1.5rem;
  transition: transform 0.3s ease;
  flex-shrink: 0;
  color: var(--primary);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
}

.faq-answer p {
  margin: 0 0 20px 0;
  line-height: 1.7;
  color: var(--text-light);
}

/* ===== HowTo Section ===== */
.howto-section {
  background: var(--bg-alt);
}

.howto-desc {
  text-align: center;
  margin-bottom: 30px;
  color: var(--text-light);
  font-size: 1.05rem;
}

.howto-steps {
  max-width: 800px;
  margin: 0 auto;
}

.howto-step {
  display: flex;
  gap: 20px;
  align-items: flex-start;
  margin-bottom: 20px;
  padding: 22px 25px;
  background: var(--card-bg);
  border-radius: var(--radius-md);
  box-shadow: 0 2px 10px rgba(0,0,0,0.05);
  transition: transform var(--transition), box-shadow var(--transition);
}

.howto-step:hover {
  transform: translateX(5px);
  box-shadow: 0 4px 15px rgba(0,0,0,0.08);
}

.step-number {
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  flex-shrink: 0;
  font-size: 1.1rem;
}

.howto-step h3 {
  margin-bottom: 5px;
  color: var(--primary);
  font-size: 1.05rem;
}

.howto-step p {
  color: var(--text-light);
  line-height: 1.6;
}

/* ===== Contact Section ===== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 15px;
}

.contact-item {
  display: flex;
  gap: 15px;
  align-items: center;
  padding: 18px 20px;
  background: var(--card-bg);
  border-radius: var(--radius-md);
  box-shadow: 0 2px 10px rgba(0,0,0,0.05);
  transition: transform var(--transition), box-shadow var(--transition);
}

.contact-item:hover {
  transform: translateX(5px);
  box-shadow: 0 4px 15px rgba(0,0,0,0.08);
}

.contact-item svg {
  flex-shrink: 0;
}

.contact-item strong {
  display: block;
  color: var(--primary);
  font-size: 0.95rem;
  margin-bottom: 2px;
}

.contact-item span {
  font-size: 0.95rem;
  color: var(--text-light);
}

.contact-form {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  padding: 35px;
  box-shadow: var(--card-shadow);
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  margin-bottom: 6px;
  font-weight: 600;
  color: var(--text);
  font-size: 0.95rem;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 12px 16px;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 1rem;
  transition: border-color var(--transition), box-shadow var(--transition);
  box-sizing: border-box;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--primary);
  outline: none;
  box-shadow: 0 0 0 3px rgba(26,82,118,0.12);
}

.form-group textarea {
  resize: vertical;
  min-height: 100px;
}

.submit-btn {
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff;
  border: none;
  padding: 14px 40px;
  border-radius: var(--radius-full);
  font-size: 1rem;
  cursor: pointer;
  font-weight: 600;
  transition: transform var(--transition), box-shadow var(--transition);
  display: inline-block;
}

.submit-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(26,82,118,0.3);
}

/* ===== Sitemap Section ===== */
.sitemap-section {
  background: var(--bg-alt);
}

.sitemap-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 30px;
}

.sitemap-col h3 {
  margin-bottom: 15px;
  color: var(--primary);
  font-size: 1.1rem;
  position: relative;
  padding-bottom: 8px;
}

.sitemap-col h3::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 30px;
  height: 2px;
  background: var(--primary);
}

.sitemap-col ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.sitemap-col li {
  margin-bottom: 8px;
}

.sitemap-col a {
  color: var(--text-light);
  text-decoration: none;
  transition: color var(--transition), padding-left var(--transition);
  font-size: 0.95rem;
}

.sitemap-col a:hover {
  color: var(--primary);
  padding-left: 3px;
}

/* ===== Friends Links ===== */
.friends-section {
  background: var(--bg);
}

.friends-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
}

.friends-links a {
  padding: 8px 22px;
  background: var(--bg-alt);
  border-radius: 20px;
  text-decoration: none;
  color: var(--text-light);
  font-size: 0.9rem;
  transition: all var(--transition);
  border: 1px solid transparent;
}

.friends-links a:hover {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
  transform: translateY(-2px);
}

/* ===== Footer ===== */
.footer {
  background: var(--primary-dark);
  color: #fff;
  padding: 60px 0 30px;
}

[data-theme="dark"] .footer {
  background: #0a0a0a;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
}

.footer-brand p {
  opacity: 0.8;
  line-height: 1.7;
  margin-top: 10px;
}

.footer-social {
  display: flex;
  gap: 12px;
  margin-top: 18px;
}

.footer-social a {
  color: #fff;
  opacity: 0.7;
  transition: opacity var(--transition), transform var(--transition);
  display: inline-block;
}

.footer-social a:hover {
  opacity: 1;
  transform: translateY(-2px);
}

.footer-links h3 {
  margin-bottom: 15px;
  font-size: 1rem;
  position: relative;
  padding-bottom: 8px;
}

.footer-links h3::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 25px;
  height: 2px;
  background: var(--accent);
}

.footer-links ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-links li {
  margin-bottom: 8px;
}

.footer-links a {
  color: rgba(255,255,255,0.7);
  text-decoration: none;
  transition: color var(--transition), padding-left var(--transition);
  font-size: 0.9rem;
}

.footer-links a:hover {
  color: #fff;
  padding-left: 3px;
}

.footer-app h3 {
  margin-bottom: 15px;
  font-size: 1rem;
}

.app-qr {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}

.app-qr svg {
  border-radius: var(--radius-sm);
  box-shadow: 0 4px 15px rgba(0,0,0,0.2);
}

.app-qr span {
  font-size: 0.85rem;
  opacity: 0.8;
}

.footer-bottom {
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px solid rgba(255,255,255,0.15);
  text-align: center;
  font-size: 0.85rem;
}

.footer-bottom p {
  margin: 5px 0;
  opacity: 0.7;
  line-height: 1.6;
}

/* ===== Back to Top ===== */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 50px;
  height: 50px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  display: none;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 15px rgba(0,0,0,0.2);
  transition: transform var(--transition), opacity var(--transition);
  z-index: 999;
}

.back-to-top.visible {
  display: flex;
  animation: fadeInUp 0.3s ease;
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.back-to-top:hover {
  transform: scale(1.1);
  box-shadow: 0 6px 20px rgba(0,0,0,0.3);
}

/* ===== 滚动动画延迟 ===== */
.section.visible .data-card:nth-child(1),
.section.visible .product-card:nth-child(1),
.section.visible .advantage-card:nth-child(1),
.section.visible .service-card:nth-child(1),
.section.visible .solution-card:nth-child(1),
.section.visible .case-card:nth-child(1),
.section.visible .testimonial-card:nth-child(1),
.section.visible .news-card:nth-child(1),
.section.visible .culture-card:nth-child(1),
.section.visible .scenario-card:nth-child(1),
.section.visible .latest-card:nth-child(1) {
  transition-delay: 0.1s;
}

.section.visible .data-card:nth-child(2),
.section.visible .product-card:nth-child(2),
.section.visible .advantage-card:nth-child(2),
.section.visible .service-card:nth-child(2),
.section.visible .solution-card:nth-child(2),
.section.visible .case-card:nth-child(2),
.section.visible .testimonial-card:nth-child(2),
.section.visible .news-card:nth-child(2),
.section.visible .culture-card:nth-child(2),
.section.visible .scenario-card:nth-child(2),
.section.visible .latest-card:nth-child(2) {
  transition-delay: 0.2s;
}

.section.visible .data-card:nth-child(3),
.section.visible .product-card:nth-child(3),
.section.visible .advantage-card:nth-child(3),
.section.visible .service-card:nth-child(3),
.section.visible .solution-card:nth-child(3),
.section.visible .case-card:nth-child(3),
.section.visible .testimonial-card:nth-child(3),
.section.visible .news-card:nth-child(3),
.section.visible .culture-card:nth-child(3),
.section.visible .scenario-card:nth-child(3),
.section.visible .latest-card:nth-child(3) {
  transition-delay: 0.3s;
}

.section.visible .data-card:nth-child(4),
.section.visible .product-card:nth-child(4) {
  transition-delay: 0.4s;
}

/* ===== 响应式布局 ===== */
@media (max-width: 992px) {
  .about-grid,
  .contact-grid {
    grid-template-columns: 1fr;
  }

  .products-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .culture-grid,
  .advantages-grid,
  .services-grid,
  .solutions-grid,
  .scenarios-grid,
  .cases-grid,
  .testimonials-grid,
  .news-grid,
  .latest-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .clients-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .sitemap-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }

  .data-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .banner-content {
    padding-right: 0;
  }

  .banner-content h1,
  .banner-content h2 {
    font-size: 2rem;
  }
}

@media (max-width: 768px) {
  .nav-menu {
    display: none;
    flex-direction: column;
    position: absolute;
    top: 70px;
    left: 0;
    right: 0;
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    padding: 20px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
    gap: 5px;
  }

  .nav-menu.open {
    display: flex;
    animation: slideDown 0.3s ease;
  }

  .mobile-menu-toggle {
    display: flex;
  }

  .banner-slide {
    flex-direction: column;
    text-align: center;
    padding: 40px 20px;
    min-height: auto;
  }

  .banner-content {
    max-width: 100%;
    margin-bottom: 30px;
  }

  .banner-content h1,
  .banner-content h2 {
    font-size: 1.8rem;
  }

  .banner-visual svg {
    max-width: 300px;
  }

  .products-grid {
    grid-template-columns: 1fr;
  }

  .culture-grid,
  .advantages-grid,
  .services-grid,
  .solutions-grid,
  .scenarios-grid,
  .cases-grid,
  .testimonials-grid,
  .news-grid,
  .latest-grid {
    grid-template-columns: 1fr;
  }

  .clients-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .sitemap-grid {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
  }

  .data-grid {
    grid-template-columns: 1fr;
  }

  .section {
    padding: 50px 0;
  }

  .section-title {
    font-size: 1.6rem;
  }

  .about-meta {
    flex-direction: column;
    gap: 10px;
  }

  .contact-form {
    padding: 25px;
  }

  .banner-controls {
    bottom: 15px;
  }

  .banner-prev,
  .banner-next {
    width: 36px;
    height: 36px;
    font-size: 1.2rem;
  }
}

@media (max-width: 480px) {
  .banner-content h1,
  .banner-content h2 {
    font-size: 1.4rem;
  }

  .nav-container {
    padding: 0 10px;
  }

  .container {
    padding: 0 15px;
  }

  .section {
    padding: 40px 0;
  }

  .section-title {
    font-size: 1.4rem;
  }

  .data-number {
    font-size: 2.2rem;
  }

  .data-unit {
    font-size: 1.2rem;
  }

  .back-to-top {
    width: 44px;
    height: 44px;
    bottom: 20px;
    right: 20px;
  }

  .footer {
    padding: 40px 0 20px;
  }

  .footer-bottom p {
    font-size: 0.8rem;
  }
}

/* ===== 暗色模式过渡 ===== */
body,
.navbar,
.search-overlay,
.breadcrumb,
.footer,
.data-card,
.culture-card,
.product-card,
.advantage-card,
.service-card,
.solution-card,
.scenario-card,
.case-card,
.testimonial-card,
.news-card,
.latest-card,
.contact-item,
.contact-form,
.howto-step,
.sitemap-col a,
.friends-links a {
  transition: background var(--transition-slow), color var(--transition-slow), border-color var(--transition-slow), box-shadow var(--transition-slow);
}