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

:root {
  --primary: #1a3a6b;
  --primary-light: #2a5a9b;
  --accent: #e63946;
  --accent-light: #ff5a6e;
  --secondary: #2a9d8f;
  --secondary-light: #3db8a8;
  --warm: #f4a261;
  --warm-light: #f7b87a;
  --bg: #f5f7fa;
  --bg-card: #ffffff;
  --text: #1e293b;
  --text-secondary: #475569;
  --text-light: #94a3b8;
  --border: #e2e8f0;
  --shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
  --shadow-hover: 0 16px 48px rgba(0, 0, 0, 0.14);
  --radius: 16px;
  --radius-sm: 10px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --glass-bg: rgba(255, 255, 255, 0.6);
  --glass-border: rgba(255, 255, 255, 0.3);
  --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.06);
  --nav-height: 72px;
  --max-width: 1200px;
  --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
}

/* 暗色模式 */
[data-theme="dark"] {
  --bg: #0f172a;
  --bg-card: #1e293b;
  --text: #f1f5f9;
  --text-secondary: #cbd5e1;
  --text-light: #64748b;
  --border: #334155;
  --shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
  --shadow-hover: 0 16px 48px rgba(0, 0, 0, 0.5);
  --glass-bg: rgba(30, 41, 59, 0.6);
  --glass-border: rgba(255, 255, 255, 0.08);
  --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}

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

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  transition: background 0.4s ease, color 0.4s ease;
  overflow-x: hidden;
  min-height: 100vh;
}

img, svg {
  max-width: 100%;
  height: auto;
  display: block;
}

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

a:hover {
  color: var(--accent);
}

h1, h2, h3, h4, h5, h6 {
  line-height: 1.3;
  font-weight: 700;
  letter-spacing: -0.02em;
}

h2 {
  font-size: 2.2rem;
  margin-bottom: 2rem;
  position: relative;
  display: inline-block;
}

h2::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 0;
  width: 60px;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  border-radius: 4px;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== 滚动动画基类 ===== */
.fade-in-up {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

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

/* ===== 导航栏 ===== */
header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: var(--glass-bg);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
  transition: var(--transition);
  height: var(--nav-height);
}

.nav-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo svg {
  transition: var(--transition);
}

.logo:hover svg {
  transform: scale(1.05);
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 8px;
}

.nav-links li a {
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.95rem;
  transition: var(--transition);
  position: relative;
}

.nav-links li a::after {
  content: '';
  position: absolute;
  bottom: 4px;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: var(--transition);
  transform: translateX(-50%);
  border-radius: 2px;
}

.nav-links li a:hover {
  color: var(--primary);
  background: rgba(26, 58, 107, 0.06);
}

.nav-links li a:hover::after {
  width: 60%;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-actions button {
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  border-radius: 50%;
  color: var(--text-secondary);
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
}

.nav-actions button:hover {
  background: var(--border);
  color: var(--primary);
}

.menu-toggle {
  display: none !important;
}

/* 搜索栏 */
.search-bar {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: 0;
  overflow: hidden;
  transition: height 0.4s ease, opacity 0.4s ease, padding 0.4s ease;
  opacity: 0;
  display: flex;
  align-items: center;
  gap: 12px;
}

.search-bar.active {
  height: 64px;
  padding: 12px 24px;
  opacity: 1;
}

.search-bar input {
  flex: 1;
  padding: 12px 18px;
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 1rem;
  background: var(--bg-card);
  color: var(--text);
  outline: none;
  transition: var(--transition);
}

.search-bar input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(26, 58, 107, 0.1);
}

.search-submit {
  padding: 12px 28px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

.search-submit:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(26, 58, 107, 0.3);
}

/* ===== Hero Banner ===== */
.hero {
  padding-top: var(--nav-height);
  min-height: 80vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(26, 58, 107, 0.03) 0%, rgba(230, 57, 70, 0.03) 100%);
  z-index: 0;
}

.hero-banner {
  position: relative;
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  z-index: 1;
}

.slide {
  display: none;
  align-items: center;
  gap: 48px;
  padding: 60px 0;
  animation: slideFade 0.6s ease;
}

.slide.active {
  display: flex;
}

@keyframes slideFade {
  from { opacity: 0; transform: translateX(30px); }
  to { opacity: 1; transform: translateX(0); }
}

.slide-content {
  flex: 1;
}

.slide-content h1 {
  font-size: 3.2rem;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 1rem;
}

.slide-content p {
  font-size: 1.15rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
  max-width: 540px;
  line-height: 1.8;
}

.btn-primary {
  display: inline-block;
  padding: 14px 36px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff;
  border-radius: 50px;
  font-weight: 600;
  font-size: 1rem;
  transition: var(--transition);
  box-shadow: 0 8px 24px rgba(26, 58, 107, 0.25);
  border: none;
  cursor: pointer;
  text-align: center;
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 36px rgba(26, 58, 107, 0.35);
  color: #fff;
}

.hero-svg {
  flex: 1;
  max-width: 500px;
  animation: float 6s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-20px); }
}

.banner-controls {
  position: absolute;
  top: 50%;
  left: 0;
  right: 0;
  transform: translateY(-50%);
  display: flex;
  justify-content: space-between;
  pointer-events: none;
  padding: 0 16px;
}

.banner-controls button {
  pointer-events: all;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: none;
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  color: var(--text);
  font-size: 1.5rem;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: var(--shadow);
  display: flex;
  align-items: center;
  justify-content: center;
}

.banner-controls button:hover {
  background: var(--primary);
  color: #fff;
  transform: scale(1.1);
}

.banner-dots {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-top: 24px;
}

.banner-dots span {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--border);
  cursor: pointer;
  transition: var(--transition);
}

.banner-dots span.active {
  background: var(--primary);
  width: 32px;
  border-radius: 6px;
}

/* ===== 通用 Section 样式 ===== */
section {
  padding: 100px 0;
  position: relative;
}

section:nth-child(even) {
  background: var(--bg-card);
}

section h2 {
  text-align: center;
  display: block;
  margin-left: auto;
  margin-right: auto;
}

section h2::after {
  left: 50%;
  transform: translateX(-50%);
}

/* ===== About ===== */
.about-content {
  display: flex;
  align-items: center;
  gap: 60px;
  margin-top: 40px;
}

.about-text {
  flex: 1;
}

.about-text p {
  color: var(--text-secondary);
  margin-bottom: 1rem;
  font-size: 1.05rem;
}

.about-svg {
  flex: 1;
  max-width: 400px;
  transition: var(--transition);
}

.about-svg:hover {
  transform: scale(1.03);
}

/* ===== Brand History Timeline ===== */
.timeline {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 24px;
  margin-top: 40px;
}

.timeline-item {
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 28px 24px;
  text-align: center;
  transition: var(--transition);
  box-shadow: var(--glass-shadow);
}

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

.timeline-item h3 {
  font-size: 2rem;
  color: var(--primary);
  margin-bottom: 8px;
}

.timeline-item p {
  color: var(--text-secondary);
}

/* ===== Team ===== */
.team-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 32px;
  margin-top: 40px;
}

.team-card {
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 32px 24px;
  text-align: center;
  transition: var(--transition);
  box-shadow: var(--glass-shadow);
}

.team-card:hover {
  transform: translateY(-6px) scale(1.02);
  box-shadow: var(--shadow-hover);
}

.team-card svg {
  margin: 0 auto 16px;
  transition: var(--transition);
}

.team-card:hover svg {
  transform: scale(1.1) rotate(-5deg);
}

.team-card h3 {
  font-size: 1.2rem;
  margin-bottom: 4px;
}

.team-card p {
  color: var(--text-light);
  font-size: 0.9rem;
}

/* ===== Products ===== */
.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 32px;
  margin-top: 40px;
}

.product-card {
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 32px 24px;
  text-align: center;
  transition: var(--transition);
  box-shadow: var(--glass-shadow);
  position: relative;
  overflow: hidden;
}

.product-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  opacity: 0;
  transition: var(--transition);
}

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

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

.product-card svg {
  margin: 0 auto 20px;
  transition: var(--transition);
}

.product-card:hover svg {
  transform: scale(1.08);
}

.product-card h3 {
  font-size: 1.3rem;
  margin-bottom: 12px;
}

.product-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* ===== Advantages ===== */
.advantage-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 32px;
  margin-top: 40px;
}

.advantage-item {
  text-align: center;
  padding: 32px 20px;
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  transition: var(--transition);
  box-shadow: var(--glass-shadow);
}

.advantage-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.advantage-item svg {
  margin: 0 auto 16px;
}

.advantage-item h3 {
  font-size: 1.1rem;
  margin-bottom: 8px;
}

.advantage-item p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* ===== Solutions ===== */
.solution-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 32px;
  margin-top: 40px;
}

.solution-card {
  background: linear-gradient(135deg, var(--glass-bg), var(--glass-bg));
  backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 36px 28px;
  transition: var(--transition);
  box-shadow: var(--glass-shadow);
}

.solution-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
  border-color: var(--primary-light);
}

.solution-card h3 {
  font-size: 1.25rem;
  margin-bottom: 12px;
  color: var(--primary);
}

.solution-card p {
  color: var(--text-secondary);
}

/* ===== Industry ===== */
.industry p {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 40px;
  color: var(--text-secondary);
  font-size: 1.05rem;
}

.industry-icons {
  display: flex;
  justify-content: center;
  gap: 40px;
  flex-wrap: wrap;
}

.industry-icons svg {
  transition: var(--transition);
  cursor: default;
}

.industry-icons svg:hover {
  transform: scale(1.15) rotate(-8deg);
}

/* ===== Cases ===== */
.case-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 32px;
  margin-top: 40px;
}

.case-card {
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: var(--transition);
  box-shadow: var(--glass-shadow);
}

.case-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
}

.case-card svg {
  width: 100%;
  transition: var(--transition);
}

.case-card:hover svg {
  transform: scale(1.03);
}

.case-card h3 {
  padding: 20px 24px 8px;
  font-size: 1.15rem;
}

.case-card p {
  padding: 0 24px 24px;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* ===== Partners ===== */
.partner-logos {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 32px;
  margin-top: 40px;
}

.partner-logos svg {
  transition: var(--transition);
  opacity: 0.7;
}

.partner-logos svg:hover {
  opacity: 1;
  transform: scale(1.08);
}

/* ===== Testimonials ===== */
.testimonial-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 32px;
  margin-top: 40px;
}

.testimonial-card {
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 32px 28px;
  transition: var(--transition);
  box-shadow: var(--glass-shadow);
  position: relative;
}

.testimonial-card::before {
  content: '"';
  position: absolute;
  top: 12px;
  left: 20px;
  font-size: 4rem;
  color: var(--primary);
  opacity: 0.15;
  line-height: 1;
}

.testimonial-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.testimonial-card p {
  font-style: italic;
  color: var(--text-secondary);
  margin-bottom: 16px;
  position: relative;
  z-index: 1;
}

.testimonial-card h4 {
  font-size: 0.95rem;
  color: var(--text-light);
  font-weight: 500;
}

/* ===== News ===== */
.news-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 32px;
  margin-top: 40px;
}

.news-card {
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: var(--transition);
  box-shadow: var(--glass-shadow);
}

.news-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
}

.news-card svg {
  width: 100%;
  transition: var(--transition);
}

.news-card:hover svg {
  transform: scale(1.03);
}

.news-card h3 {
  padding: 20px 24px 8px;
  font-size: 1.1rem;
}

.news-card p {
  padding: 0 24px;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.read-more {
  display: inline-block;
  margin: 16px 24px 24px;
  color: var(--primary);
  font-weight: 600;
  font-size: 0.9rem;
  transition: var(--transition);
}

.read-more:hover {
  color: var(--accent);
  transform: translateX(4px);
}

.news-navigation {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}

.news-navigation a {
  color: var(--text-secondary);
  font-size: 0.9rem;
  transition: var(--transition);
}

.news-navigation a:hover {
  color: var(--primary);
}

/* ===== Related Articles ===== */
.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  margin-top: 40px;
}

.related-grid article {
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  padding: 24px;
  transition: var(--transition);
}

.related-grid article:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.related-grid h3 {
  font-size: 1rem;
  margin-bottom: 8px;
}

.related-grid p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 12px;
}

.related-grid a {
  color: var(--primary);
  font-weight: 600;
  font-size: 0.85rem;
}

/* ===== FAQ ===== */
.faq-item {
  margin-bottom: 12px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  transition: var(--transition);
}

.faq-item:hover {
  box-shadow: var(--shadow);
}

.faq-question {
  width: 100%;
  padding: 20px 24px;
  background: none;
  border: none;
  text-align: left;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.faq-question::after {
  content: '+';
  font-size: 1.5rem;
  color: var(--primary);
  transition: var(--transition);
}

.faq-item.active .faq-question::after {
  content: '−';
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.4s ease;
  padding: 0 24px;
}

.faq-item.active .faq-answer {
  max-height: 300px;
  padding: 0 24px 20px;
}

.faq-answer p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* ===== HowTo ===== */
.howto-steps {
  max-width: 700px;
  margin: 40px auto 0;
  counter-reset: step;
  list-style: none;
}

.howto-steps li {
  counter-increment: step;
  padding: 18px 24px 18px 60px;
  position: relative;
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  margin-bottom: 16px;
  color: var(--text-secondary);
  transition: var(--transition);
  font-size: 1rem;
}

.howto-steps li:hover {
  transform: translateX(8px);
  box-shadow: var(--shadow);
}

.howto-steps li::before {
  content: counter(step);
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.9rem;
}

/* ===== Contact ===== */
.contact p {
  text-align: center;
  color: var(--text-secondary);
  margin-bottom: 8px;
  font-size: 1.05rem;
}

.contact p:first-of-type {
  margin-top: 32px;
}

/* ===== Friendship Links & Sitemap ===== */
.friendship-links ul,
.sitemap ul {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px 24px;
  list-style: none;
  margin-top: 24px;
}

.friendship-links a,
.sitemap a {
  color: var(--text-secondary);
  font-size: 0.9rem;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.friendship-links a:hover,
.sitemap a:hover {
  background: var(--border);
  color: var(--primary);
}

/* ===== Footer ===== */
footer {
  background: var(--bg-card);
  border-top: 1px solid var(--border);
  padding: 48px 0;
  text-align: center;
}

footer p {
  color: var(--text-light);
  font-size: 0.85rem;
  margin-bottom: 6px;
  line-height: 1.6;
}

footer p:last-child {
  margin-top: 12px;
  font-size: 0.8rem;
  color: var(--text-light);
}

/* ===== Back to Top ===== */
#back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  box-shadow: 0 8px 24px rgba(26, 58, 107, 0.3);
  transition: var(--transition);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  z-index: 999;
  display: flex;
  align-items: center;
  justify-content: center;
}

#back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

#back-to-top:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 36px rgba(26, 58, 107, 0.4);
}

/* ===== 响应式设计 ===== */
@media (max-width: 1024px) {
  .slide-content h1 {
    font-size: 2.5rem;
  }

  .hero-svg {
    max-width: 350px;
  }
}

@media (max-width: 768px) {
  :root {
    --nav-height: 64px;
  }

  h2 {
    font-size: 1.8rem;
  }

  .nav-links {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 16px 24px;
    gap: 4px;
    transform: translateY(-120%);
    transition: transform 0.4s ease;
    box-shadow: var(--shadow);
    border-bottom: 1px solid var(--glass-border);
  }

  .nav-links.active {
    transform: translateY(0);
  }

  .menu-toggle {
    display: flex !important;
  }

  .slide {
    flex-direction: column;
    text-align: center;
    padding: 40px 0;
    gap: 32px;
  }

  .slide-content h1 {
    font-size: 2rem;
  }

  .slide-content p {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-svg {
    max-width: 280px;
  }

  .about-content {
    flex-direction: column;
    text-align: center;
    gap: 32px;
  }

  .about-svg {
    max-width: 280px;
  }

  .banner-controls button {
    width: 40px;
    height: 40px;
    font-size: 1.2rem;
  }

  .team-grid,
  .product-grid,
  .solution-grid,
  .case-grid,
  .news-grid,
  .testimonial-grid {
    grid-template-columns: 1fr;
  }

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

  .news-navigation {
    flex-direction: column;
    align-items: center;
  }

  #back-to-top {
    bottom: 20px;
    right: 20px;
    width: 42px;
    height: 42px;
    font-size: 1.2rem;
  }

  section {
    padding: 60px 0;
  }
}

@media (max-width: 480px) {
  .slide-content h1 {
    font-size: 1.6rem;
  }

  .hero-svg {
    max-width: 220px;
  }

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

  .partner-logos svg {
    width: 80px;
    height: auto;
  }

  .container {
    padding: 0 16px;
  }
}

/* ===== 暗色模式额外适配 ===== */
[data-theme="dark"] .nav-links li a:hover {
  background: rgba(255, 255, 255, 0.06);
}

[data-theme="dark"] .btn-primary {
  box-shadow: 0 8px 24px rgba(26, 58, 107, 0.5);
}

[data-theme="dark"] .btn-primary:hover {
  box-shadow: 0 12px 36px rgba(26, 58, 107, 0.6);
}

[data-theme="dark"] .search-bar input {
  background: var(--bg-card);
  border-color: var(--border);
}

[data-theme="dark"] .search-bar input:focus {
  border-color: var(--primary-light);
  box-shadow: 0 0 0 4px rgba(42, 90, 155, 0.2);
}

/* ===== 渐变banner背景装饰（随机风格） ===== */
.hero-banner {
  background: radial-gradient(circle at 10% 30%, rgba(26, 58, 107, 0.04) 0%, transparent 50%),
              radial-gradient(circle at 90% 70%, rgba(230, 57, 70, 0.04) 0%, transparent 50%);
}

/* ===== 毛玻璃效果增强 ===== */
.glass-card {
  background: var(--glass-bg);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  box-shadow: var(--glass-shadow);
}

/* ===== 滚动动画 - 使用Intersection Observer (JS会添加visible类) ===== */
section > .container > * {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

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

/* 延迟动画 */
section.visible .timeline-item:nth-child(1) { transition-delay: 0.05s; }
section.visible .timeline-item:nth-child(2) { transition-delay: 0.1s; }
section.visible .timeline-item:nth-child(3) { transition-delay: 0.15s; }
section.visible .timeline-item:nth-child(4) { transition-delay: 0.2s; }

section.visible .team-card:nth-child(1) { transition-delay: 0.05s; }
section.visible .team-card:nth-child(2) { transition-delay: 0.1s; }
section.visible .team-card:nth-child(3) { transition-delay: 0.15s; }
section.visible .team-card:nth-child(4) { transition-delay: 0.2s; }

section.visible .product-card:nth-child(1) { transition-delay: 0.05s; }
section.visible .product-card:nth-child(2) { transition-delay: 0.1s; }
section.visible .product-card:nth-child(3) { transition-delay: 0.15s; }

section.visible .advantage-item:nth-child(1) { transition-delay: 0.05s; }
section.visible .advantage-item:nth-child(2) { transition-delay: 0.1s; }
section.visible .advantage-item:nth-child(3) { transition-delay: 0.15s; }

section.visible .solution-card:nth-child(1) { transition-delay: 0.05s; }
section.visible .solution-card:nth-child(2) { transition-delay: 0.1s; }
section.visible .solution-card:nth-child(3) { transition-delay: 0.15s; }

section.visible .case-card:nth-child(1) { transition-delay: 0.05s; }
section.visible .case-card:nth-child(2) { transition-delay: 0.1s; }

section.visible .news-card:nth-child(1) { transition-delay: 0.05s; }
section.visible .news-card:nth-child(2) { transition-delay: 0.1s; }

section.visible .testimonial-card:nth-child(1) { transition-delay: 0.05s; }
section.visible .testimonial-card:nth-child(2) { transition-delay: 0.1s; }

section.visible .faq-item:nth-child(1) { transition-delay: 0.05s; }
section.visible .faq-item:nth-child(2) { transition-delay: 0.1s; }
section.visible .faq-item:nth-child(3) { transition-delay: 0.15s; }

/* ===== 选中状态 ===== */
::selection {
  background: var(--primary);
  color: #fff;
}

/* ===== 滚动条美化 ===== */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg);
}

::-webkit-scrollbar-thumb {
  background: var(--text-light);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--primary-light);
}