/* ============================================
   欧交易所 - 全局样式表
   专业金融/数字货币交易平台风格
   ============================================ */

/* CSS Reset & 基础变量 */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  /* 主色调 - 专业金融蓝 + 金色点缀 */
  --primary-color: #1a56db;
  --primary-dark: #1240aa;
  --primary-light: #3b82f6;
  --secondary-color: #f59e0b;
  --secondary-dark: #d97706;
  --accent-color: #10b981;
  --danger-color: #ef4444;
  
  /* 中性色 */
  --dark-bg: #0f172a;
  --dark-bg-2: #1e293b;
  --dark-bg-3: #334155;
  --light-bg: #f8fafc;
  --white: #ffffff;
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;
  
  /* 字体 */
  --font-primary: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  
  /* 间距 */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;
  --spacing-4xl: 6rem;
  
  /* 圆角 */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-full: 9999px;
  
  /* 阴影 */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
  --shadow-dark: 0 20px 25px -5px rgba(0, 0, 0, 0.3), 0 8px 10px -6px rgba(0, 0, 0, 0.3);
  
  /* 过渡 */
  --transition-fast: 150ms ease;
  --transition-normal: 300ms ease;
  --transition-slow: 500ms ease;
  
  /* 容器宽度 */
  --container-max: 1200px;
}

/* HTML & Body */
html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-primary);
  line-height: 1.6;
  color: var(--gray-800);
  background-color: var(--white);
  overflow-x: hidden;
}

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

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

a:hover {
  color: var(--primary-dark);
}

/* 容器 */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

/* ============================================
   导航栏
   ============================================ */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(15, 23, 42, 0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  transition: all var(--transition-normal);
}

.header.scrolled {
  box-shadow: var(--shadow-lg);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  color: var(--white);
  font-size: 1.25rem;
  font-weight: 700;
}

.nav-brand-logo {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-weight: 800;
  font-size: 1.1rem;
}

.nav-brand-text {
  background: linear-gradient(135deg, var(--white), var(--gray-300));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--spacing-xl);
  list-style: none;
}

.nav-link {
  color: var(--gray-300);
  font-weight: 500;
  font-size: 0.95rem;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  position: relative;
}

.nav-link:hover,
.nav-link.active {
  color: var(--white);
  background: rgba(255, 255, 255, 0.1);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -24px;
  left: 50%;
  transform: translateX(-50%);
  width: 30px;
  height: 3px;
  background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
  border-radius: var(--radius-full);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.nav-btn {
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: none;
  font-family: var(--font-primary);
}

.nav-btn-outline {
  background: transparent;
  color: var(--white);
  border: 1px solid var(--gray-500);
}

.nav-btn-outline:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--gray-300);
}

.nav-btn-primary {
  background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
  color: var(--white);
}

.nav-btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(26, 86, 219, 0.4);
}

/* 移动端菜单按钮 */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-sm);
}

.nav-toggle-bar {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--white);
  margin: 5px 0;
  transition: all var(--transition-fast);
}

/* ============================================
   Hero 区域
   ============================================ */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: linear-gradient(135deg, var(--dark-bg) 0%, var(--dark-bg-2) 50%, #1a1a3e 100%);
  position: relative;
  overflow: hidden;
  padding: 120px 0 80px;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(26, 86, 219, 0.3) 0%, transparent 70%);
  border-radius: 50%;
  animation: pulse 8s ease-in-out infinite;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(245, 158, 11, 0.2) 0%, transparent 70%);
  border-radius: 50%;
  animation: pulse 10s ease-in-out infinite reverse;
}

@keyframes pulse {
  0%, 100% { transform: scale(1); opacity: 0.5; }
  50% { transform: scale(1.1); opacity: 0.8; }
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-4xl);
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-text {
  animation: fadeInUp 1s ease;
}

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

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  background: rgba(26, 86, 219, 0.2);
  border: 1px solid rgba(26, 86, 219, 0.3);
  color: var(--primary-light);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: var(--spacing-lg);
}

.hero-badge-dot {
  width: 8px;
  height: 8px;
  background: var(--accent-color);
  border-radius: 50%;
  animation: blink 2s infinite;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.hero h1 {
  font-size: 3rem;
  font-weight: 800;
  color: var(--white);
  line-height: 1.2;
  margin-bottom: var(--spacing-lg);
}

.hero h1 .highlight {
  background: linear-gradient(135deg, var(--primary-light), var(--secondary-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.125rem;
  color: var(--gray-400);
  margin-bottom: var(--spacing-2xl);
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-2xl);
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-xl);
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: all var(--transition-normal);
  border: none;
  font-family: var(--font-primary);
  text-decoration: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
  color: var(--white);
  box-shadow: 0 4px 15px rgba(26, 86, 219, 0.4);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 25px rgba(26, 86, 219, 0.5);
  color: var(--white);
}

.btn-secondary {
  background: transparent;
  color: var(--white);
  border: 2px solid var(--gray-500);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--white);
  color: var(--white);
  transform: translateY(-3px);
}

.btn-lg {
  padding: var(--spacing-lg) var(--spacing-2xl);
  font-size: 1.05rem;
}

.hero-stats {
  display: flex;
  gap: var(--spacing-2xl);
}

.hero-stat-item {
  text-align: left;
}

.hero-stat-value {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--white);
}

.hero-stat-label {
  font-size: 0.85rem;
  color: var(--gray-500);
}

/* Hero 右侧 - 交易所预览卡片 */
.hero-visual {
  animation: fadeInRight 1.2s ease;
}

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

.exchange-card {
  background: rgba(30, 41, 59, 0.8);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-dark);
}

.exchange-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-md);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.exchange-card-title {
  color: var(--white);
  font-weight: 600;
}

.exchange-card-status {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  color: var(--accent-color);
  font-size: 0.85rem;
}

.trade-pairs {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.trade-pair {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md);
  background: rgba(15, 23, 42, 0.5);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.trade-pair:hover {
  background: rgba(255, 255, 255, 0.05);
  transform: translateX(4px);
}

.trade-pair-info {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.trade-pair-icon {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--white);
}

.trade-pair-icon.btc { background: linear-gradient(135deg, #f7931a, #e67e00); }
.trade-pair-icon.eth { background: linear-gradient(135deg, #627eea, #4a6bd4); }
.trade-pair-icon.sol { background: linear-gradient(135deg, #9945ff, #14f195); }
.trade-pair-icon.bnb { background: linear-gradient(135deg, #f3ba2f, #f0b90b); }

.trade-pair-name {
  color: var(--white);
  font-weight: 600;
}

.trade-pair-symbol {
  color: var(--gray-500);
  font-size: 0.85rem;
}

.trade-pair-price {
  text-align: right;
}

.trade-pair-price-value {
  color: var(--white);
  font-weight: 600;
}

.trade-pair-price-change {
  font-size: 0.85rem;
  font-weight: 500;
}

.trade-pair-price-change.up {
  color: var(--accent-color);
}

.trade-pair-price-change.down {
  color: var(--danger-color);
}

/* ============================================
   通用 Section 样式
   ============================================ */
.section {
  padding: var(--spacing-4xl) 0;
}

.section-alt {
  background: var(--light-bg);
}

.section-dark {
  background: var(--dark-bg);
  color: var(--white);
}

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto var(--spacing-3xl);
}

.section-tag {
  display: inline-block;
  color: var(--primary-color);
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: var(--spacing-sm);
  text-transform: uppercase;
  letter-spacing: 2px;
}

.section-title {
  font-size: 2.25rem;
  font-weight: 800;
  margin-bottom: var(--spacing-md);
  color: var(--gray-900);
}

.section-dark .section-title {
  color: var(--white);
}

.section-desc {
  color: var(--gray-500);
  font-size: 1.05rem;
  line-height: 1.8;
}

.section-dark .section-desc {
  color: var(--gray-400);
}

/* ============================================
   核心特性 Features
   ============================================ */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-xl);
}

.feature-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: var(--spacing-2xl);
  border: 1px solid var(--gray-200);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-normal);
}

.feature-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
  border-color: transparent;
}

.feature-card:hover::before {
  transform: scaleX(1);
}

.feature-icon {
  width: 64px;
  height: 64px;
  background: linear-gradient(135deg, rgba(26, 86, 219, 0.1), rgba(245, 158, 11, 0.1));
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--spacing-lg);
  font-size: 1.75rem;
}

.feature-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: var(--spacing-md);
  color: var(--gray-900);
}

.feature-desc {
  color: var(--gray-500);
  line-height: 1.7;
}

/* ============================================
   服务介绍 Services
   ============================================ */
.services-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-xl);
}

.service-item {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-xl);
  align-items: center;
}

.service-item.reverse {
  direction: rtl;
}

.service-item.reverse > * {
  direction: ltr;
}

.service-content h3 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: var(--spacing-md);
}

.section-dark .service-content h3 {
  color: var(--white);
}

.service-content p {
  color: var(--gray-500);
  margin-bottom: var(--spacing-lg);
  line-height: 1.8;
}

.section-dark .service-content p {
  color: var(--gray-400);
}

.service-features {
  list-style: none;
  margin-bottom: var(--spacing-lg);
}

.service-features li {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) 0;
  color: var(--gray-600);
}

.section-dark .service-features li {
  color: var(--gray-300);
}

.service-features li::before {
  content: '✓';
  width: 24px;
  height: 24px;
  background: var(--accent-color);
  color: var(--white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
  flex-shrink: 0;
}

.service-image {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.service-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.service-image:hover img {
  transform: scale(1.05);
}

/* ============================================
   数据统计区
   ============================================ */
.stats-section {
  background: linear-gradient(135deg, var(--dark-bg) 0%, #1a1a3e 100%);
  padding: var(--spacing-3xl) 0;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-xl);
}

.stat-card {
  text-align: center;
  padding: var(--spacing-xl);
}

.stat-number {
  font-size: 3rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary-light), var(--secondary-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--spacing-sm);
}

.stat-label {
  color: var(--gray-400);
  font-size: 1rem;
}

/* ============================================
   行动号召 CTA
   ============================================ */
.cta {
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
  border-radius: 50%;
}

.cta-content {
  position: relative;
  z-index: 1;
}

.cta h2 {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--white);
  margin-bottom: var(--spacing-md);
}

.cta p {
  font-size: 1.125rem;
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: var(--spacing-2xl);
}

.cta .btn-primary {
  background: var(--white);
  color: var(--primary-color);
}

.cta .btn-primary:hover {
  background: var(--gray-100);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.2);
}

/* ============================================
   页脚 Footer
   ============================================ */
.footer {
  background: var(--dark-bg);
  color: var(--gray-400);
  padding-top: var(--spacing-3xl);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--spacing-2xl);
  padding-bottom: var(--spacing-2xl);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-brand p {
  margin-top: var(--spacing-md);
  line-height: 1.8;
  max-width: 300px;
}

.footer-social {
  display: flex;
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

.footer-social a {
  width: 40px;
  height: 40px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--gray-300);
  transition: all var(--transition-fast);
}

.footer-social a:hover {
  background: var(--primary-color);
  color: var(--white);
  transform: translateY(-3px);
}

.footer-col h4 {
  color: var(--white);
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: var(--spacing-lg);
}

.footer-col ul {
  list-style: none;
}

.footer-col ul li {
  margin-bottom: var(--spacing-sm);
}

.footer-col ul li a {
  color: var(--gray-500);
  font-size: 0.95rem;
  transition: color var(--transition-fast);
}

.footer-col ul li a:hover {
  color: var(--white);
}

.footer-bottom {
  padding: var(--spacing-xl) 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-md);
}

.footer-copyright {
  font-size: 0.9rem;
}

.footer-links {
  display: flex;
  gap: var(--spacing-xl);
}

.footer-links a {
  color: var(--gray-500);
  font-size: 0.9rem;
}

.footer-links a:hover {
  color: var(--white);
}

/* ============================================
   页面 Banner (内页通用)
   ============================================ */
.page-banner {
  background: linear-gradient(135deg, var(--dark-bg) 0%, #1a1a3e 100%);
  padding: 160px 0 100px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.page-banner::before {
  content: '';
  position: absolute;
  top: -50%;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(26, 86, 219, 0.2) 0%, transparent 70%);
  border-radius: 50%;
}

.page-banner-content {
  position: relative;
  z-index: 1;
}

.page-banner h1 {
  font-size: 2.75rem;
  font-weight: 800;
  color: var(--white);
  margin-bottom: var(--spacing-md);
}

.page-banner p {
  color: var(--gray-400);
  font-size: 1.125rem;
  max-width: 600px;
  margin: 0 auto;
}

.breadcrumb {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
  font-size: 0.9rem;
  color: var(--gray-500);
}

.breadcrumb a {
  color: var(--gray-400);
}

.breadcrumb a:hover {
  color: var(--white);
}

.breadcrumb-separator {
  color: var(--gray-600);
}

/* ============================================
   关于页面
   ============================================ */
.about-intro {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-3xl);
  align-items: center;
}

.about-image {
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-xl);
}

.about-image img {
  width: 100%;
  height: 450px;
  object-fit: cover;
}

.about-content h2 {
  font-size: 2rem;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: var(--spacing-lg);
}

.about-content p {
  color: var(--gray-500);
  line-height: 1.9;
  margin-bottom: var(--spacing-md);
}

.about-values {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-xl);
  margin-top: var(--spacing-2xl);
}

.value-card {
  text-align: center;
  padding: var(--spacing-xl);
  background: var(--white);
  border-radius: var(--radius-lg);
  border: 1px solid var(--gray-200);
  transition: all var(--transition-normal);
}

.value-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-color);
}

.value-icon {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-md);
}

.value-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: var(--spacing-sm);
}

.value-card p {
  font-size: 0.9rem;
  color: var(--gray-500);
}

.team-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-xl);
}

.team-card {
  text-align: center;
  background: var(--white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--gray-200);
  transition: all var(--transition-normal);
}

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

.team-image {
  width: 100%;
  height: 280px;
  overflow: hidden;
}

.team-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.team-card:hover .team-image img {
  transform: scale(1.05);
}

.team-info {
  padding: var(--spacing-lg);
}

.team-name {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: var(--spacing-xs);
}

.team-role {
  color: var(--primary-color);
  font-size: 0.9rem;
  font-weight: 500;
}

/* ============================================
   产品页面
   ============================================ */
.products-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-xl);
}

.product-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--gray-200);
  transition: all var(--transition-normal);
}

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

.product-image {
  width: 100%;
  height: 220px;
  overflow: hidden;
}

.product-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

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

.product-info {
  padding: var(--spacing-xl);
}

.product-tag {
  display: inline-block;
  background: rgba(26, 86, 219, 0.1);
  color: var(--primary-color);
  font-size: 0.8rem;
  padding: 2px 10px;
  border-radius: var(--radius-full);
  font-weight: 500;
  margin-bottom: var(--spacing-sm);
}

.product-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: var(--spacing-sm);
}

.product-desc {
  color: var(--gray-500);
  font-size: 0.95rem;
  line-height: 1.7;
  margin-bottom: var(--spacing-md);
}

.product-features {
  list-style: none;
  margin-bottom: var(--spacing-md);
}

.product-features li {
  font-size: 0.85rem;
  color: var(--gray-600);
  padding: 2px 0;
  padding-left: 16px;
  position: relative;
}

.product-features li::before {
  content: '•';
  position: absolute;
  left: 0;
  color: var(--primary-color);
}

/* ============================================
   新闻页面
   ============================================ */
.news-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-xl);
}

.news-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--gray-200);
  transition: all var(--transition-normal);
  cursor: pointer;
}

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

.news-image {
  width: 100%;
  height: 200px;
  overflow: hidden;
}

.news-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.news-card:hover .news-image img {
  transform: scale(1.08);
}

.news-content {
  padding: var(--spacing-lg);
}

.news-meta {
  display: flex;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-sm);
  font-size: 0.85rem;
  color: var(--gray-500);
}

.news-category {
  color: var(--primary-color);
  font-weight: 500;
}

.news-title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: var(--spacing-sm);
  line-height: 1.5;
  transition: color var(--transition-fast);
}

.news-card:hover .news-title {
  color: var(--primary-color);
}

.news-excerpt {
  color: var(--gray-500);
  font-size: 0.9rem;
  line-height: 1.7;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* 新闻详情 */
.news-detail {
  max-width: 800px;
  margin: 0 auto;
}

.news-detail-header {
  margin-bottom: var(--spacing-2xl);
}

.news-detail-title {
  font-size: 2rem;
  font-weight: 800;
  color: var(--gray-900);
  margin-bottom: var(--spacing-md);
  line-height: 1.4;
}

.news-detail-meta {
  display: flex;
  gap: var(--spacing-xl);
  color: var(--gray-500);
  font-size: 0.9rem;
  padding-bottom: var(--spacing-md);
  border-bottom: 1px solid var(--gray-200);
}

.news-detail-image {
  width: 100%;
  height: 400px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-bottom: var(--spacing-2xl);
}

.news-detail-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.news-detail-content {
  color: var(--gray-700);
  line-height: 2;
  font-size: 1.05rem;
}

.news-detail-content p {
  margin-bottom: var(--spacing-lg);
}

.news-detail-content h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--gray-900);
  margin: var(--spacing-2xl) 0 var(--spacing-md);
}

.news-detail-content h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--gray-900);
  margin: var(--spacing-xl) 0 var(--spacing-md);
}

.news-detail-content ul,
.news-detail-content ol {
  padding-left: var(--spacing-xl);
  margin-bottom: var(--spacing-lg);
}

.news-detail-content li {
  margin-bottom: var(--spacing-sm);
}

/* ============================================
   联系页面
   ============================================ */
.contact-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-3xl);
}

.contact-info h2 {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: var(--spacing-lg);
}

.contact-info p {
  color: var(--gray-500);
  line-height: 1.8;
  margin-bottom: var(--spacing-xl);
}

.contact-list {
  list-style: none;
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-md);
  padding: var(--spacing-lg) 0;
  border-bottom: 1px solid var(--gray-200);
}

.contact-item:last-child {
  border-bottom: none;
}

.contact-item-icon {
  width: 48px;
  height: 48px;
  background: rgba(26, 86, 219, 0.1);
  color: var(--primary-color);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  flex-shrink: 0;
}

.contact-item-label {
  font-size: 0.85rem;
  color: var(--gray-500);
  margin-bottom: 2px;
}

.contact-item-value {
  font-weight: 600;
  color: var(--gray-900);
}

/* 联系表单 */
.contact-form-wrapper {
  background: var(--white);
  border-radius: var(--radius-xl);
  padding: var(--spacing-2xl);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--gray-200);
}

.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-label {
  display: block;
  font-weight: 500;
  color: var(--gray-700);
  margin-bottom: var(--spacing-sm);
  font-size: 0.95rem;
}

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  padding: var(--spacing-md);
  border: 1px solid var(--gray-300);
  border-radius: var(--radius-md);
  font-family: var(--font-primary);
  font-size: 1rem;
  color: var(--gray-800);
  transition: all var(--transition-fast);
  background: var(--white);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(26, 86, 219, 0.1);
}

.form-textarea {
  resize: vertical;
  min-height: 140px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-md);
}

/* FAQ 常见问题 */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  margin-bottom: var(--spacing-md);
  overflow: hidden;
  transition: all var(--transition-normal);
}

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

.faq-question {
  width: 100%;
  padding: var(--spacing-lg) var(--spacing-xl);
  background: none;
  border: none;
  text-align: left;
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--gray-900);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-primary);
  transition: color var(--transition-fast);
}

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

.faq-toggle {
  width: 24px;
  height: 24px;
  background: var(--gray-100);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  color: var(--gray-600);
  transition: transform var(--transition-fast);
  flex-shrink: 0;
}

.faq-item.active .faq-toggle {
  background: var(--primary-color);
  color: var(--white);
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-normal);
}

.faq-item.active .faq-answer {
  max-height: 300px;
}

.faq-answer-inner {
  padding: 0 var(--spacing-xl) var(--spacing-lg);
  color: var(--gray-500);
  line-height: 1.8;
}

/* ============================================
   返回顶部按钮
   ============================================ */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 50px;
  height: 50px;
  background: var(--primary-color);
  color: var(--white);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  font-size: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-lg);
  z-index: 999;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  background: var(--primary-dark);
  transform: translateY(-3px);
}

/* ============================================
   动画类
   ============================================ */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.8s ease;
}

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

.slide-in-left {
  opacity: 0;
  transform: translateX(-50px);
  transition: all 0.8s ease;
}

.slide-in-left.visible {
  opacity: 1;
  transform: translateX(0);
}

.slide-in-right {
  opacity: 0;
  transform: translateX(50px);
  transition: all 0.8s ease;
}

.slide-in-right.visible {
  opacity: 1;
  transform: translateX(0);
}

.scale-in {
  opacity: 0;
  transform: scale(0.9);
  transition: all 0.6s ease;
}

.scale-in.visible {
  opacity: 1;
  transform: scale(1);
}

/* ============================================
   响应式设计
   ============================================ */
@media (max-width: 1024px) {
  .hero-content {
    grid-template-columns: 1fr;
    gap: var(--spacing-2xl);
  }
  
  .hero h1 {
    font-size: 2.25rem;
  }
  
  .services-grid {
    grid-template-columns: 1fr;
  }
  
  .service-item,
  .service-item.reverse {
    grid-template-columns: 1fr;
    direction: ltr;
  }
  
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .team-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
  
  .about-intro {
    grid-template-columns: 1fr;
  }
  
  .contact-layout {
    grid-template-columns: 1fr;
  }
  
  .products-grid,
  .news-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .nav-menu,
  .nav-actions {
    display: none;
  }
  
  .nav-toggle {
    display: block;
  }
  
  .nav-menu.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--dark-bg);
    padding: var(--spacing-xl);
    gap: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
  }
  
  .nav-link.active::after {
    display: none;
  }
  
  .hero {
    padding: 100px 0 60px;
    min-height: auto;
  }
  
  .hero h1 {
    font-size: 2rem;
  }
  
  .hero-stats {
    flex-wrap: wrap;
    gap: var(--spacing-lg);
  }
  
  .section {
    padding: var(--spacing-2xl) 0;
  }
  
  .section-title {
    font-size: 1.75rem;
  }
  
  .services-grid,
  .features-grid,
  .products-grid,
  .news-grid {
    grid-template-columns: 1fr;
  }
  
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
  }
  
  .stat-number {
    font-size: 2rem;
  }
  
  .team-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
  }
  
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
  
  .about-values {
    grid-template-columns: 1fr;
  }
  
  .form-row {
    grid-template-columns: 1fr;
  }
  
  .page-banner {
    padding: 120px 0 60px;
  }
  
  .page-banner h1 {
    font-size: 2rem;
  }
  
  .cta h2 {
    font-size: 1.75rem;
  }
  
  .btn-lg {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1rem;
  }
  
  .hero-actions {
    flex-direction: column;
  }
  
  .hero-actions .btn {
    width: 100%;
    justify-content: center;
  }
  
  .news-detail-title {
    font-size: 1.5rem;
  }
  
  .news-detail-image {
    height: 250px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--spacing-md);
  }
  
  .hero h1 {
    font-size: 1.75rem;
  }
  
  .hero-badge {
    font-size: 0.75rem;
  }
  
  .stat-number {
    font-size: 1.75rem;
  }
  
  .features-grid {
    gap: var(--spacing-md);
  }
  
  .feature-card {
    padding: var(--spacing-xl);
  }
}

/* ============================================
   打印样式
   ============================================ */
@media print {
  .header,
  .footer,
  .hero-actions,
  .back-to-top,
  .cta {
    display: none !important;
  }
  
  body {
    color: #000;
    background: #fff;
  }
  
  .section {
    padding: 1rem 0;
    page-break-inside: avoid;
  }
}