/* ============================================
   CONAY Club 柯纳吖 - 企业官网样式
   商务蓝主色 + 乐园设计视觉点缀
   ============================================ */

:root {
  /* 主色系 - 商务蓝 */
  --primary: #1a56db;
  --primary-dark: #1e40af;
  --primary-light: #3b82f6;
  --primary-bg: #eff6ff;

  /* 点缀色 - 乐园活力 */
  --accent-orange: #f59e0b;
  --accent-green: #10b981;
  --accent-purple: #8b5cf6;
  --accent-pink: #ec4899;
  --accent-teal: #14b8a6;

  /* 中性色 */
  --text-primary: #1f2937;
  --text-secondary: #4b5563;
  --text-muted: #9ca3af;
  --bg-white: #ffffff;
  --bg-gray: #f9fafb;
  --bg-light: #f3f4f6;
  --border: #e5e7eb;
  --border-light: #f3f4f6;

  /* 阴影 */
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 15px rgba(0,0,0,0.1), 0 4px 6px rgba(0,0,0,0.05);
  --shadow-xl: 0 20px 25px rgba(0,0,0,0.1), 0 10px 10px rgba(0,0,0,0.04);

  /* 圆角 */
  --radius: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;

  /* 字体 */
  --font-sans: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;

  /* 布局 */
  --max-width: 1200px;
  --header-height: 72px;
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font-sans);
  color: var(--text-primary);
  background: var(--bg-white);
  line-height: 1.6;
  min-height: 100vh;
}

a {
  color: inherit;
  text-decoration: none;
}

ul, ol {
  list-style: none;
}

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

button {
  cursor: pointer;
  border: none;
  font-family: inherit;
}

input, textarea, select {
  font-family: inherit;
  font-size: inherit;
}

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

/* ========== 头部导航 ========== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  z-index: 1000;
  transition: box-shadow 0.3s;
}

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

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary);
}

.logo-icon {
  width: 42px;
  height: 42px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.2rem;
  font-weight: 900;
}

.logo-text .brand {
  display: block;
  font-size: 1.1rem;
  line-height: 1.2;
}

.logo-text .sub {
  display: block;
  font-size: 0.7rem;
  color: var(--text-muted);
  font-weight: 400;
}

/* 导航链接 */
.nav {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav a {
  padding: 8px 16px;
  border-radius: var(--radius);
  font-size: 0.925rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all 0.2s;
  position: relative;
}

.nav a:hover,
.nav a.active {
  color: var(--primary);
  background: var(--primary-bg);
}

.nav a.active::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 16px;
  right: 16px;
  height: 2px;
  background: var(--primary);
  border-radius: 1px;
}

/* 移动端菜单按钮 */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
  background: none;
}

.menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all 0.3s;
}

.menu-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.menu-toggle.active span:nth-child(2) {
  opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ========== 页脚 ========== */
.footer {
  background: #111827;
  color: #d1d5db;
  padding: 60px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid #374151;
}

.footer h3 {
  color: white;
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 16px;
}

.footer p {
  font-size: 0.875rem;
  line-height: 1.7;
}

.footer-links a {
  display: block;
  font-size: 0.875rem;
  color: #9ca3af;
  padding: 4px 0;
  transition: color 0.2s;
}

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

.footer-bottom {
  padding: 20px 0;
  text-align: center;
  font-size: 0.8rem;
  color: #6b7280;
}

/* ========== 按钮 ========== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 24px;
  border-radius: var(--radius);
  font-size: 0.925rem;
  font-weight: 600;
  transition: all 0.25s;
  white-space: nowrap;
}

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

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-outline {
  border: 2px solid var(--primary);
  color: var(--primary);
  background: transparent;
}

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

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

.btn-white:hover {
  background: var(--primary-bg);
}

.btn-lg {
  padding: 14px 32px;
  font-size: 1rem;
}

/* ========== 板块标题 ========== */
.section-header {
  text-align: center;
  margin-bottom: 48px;
}

.section-header .label {
  display: inline-block;
  padding: 4px 16px;
  background: var(--primary-bg);
  color: var(--primary);
  border-radius: 100px;
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.section-header h2 {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.section-header p {
  color: var(--text-muted);
  font-size: 1rem;
  max-width: 600px;
  margin: 0 auto;
}

/* ========== Banner ========== */
.banner {
  margin-top: var(--header-height);
  position: relative;
  min-height: 560px;
  background: linear-gradient(135deg, #1e3a5f 0%, #1a56db 40%, #3b82f6 70%, #60a5fa 100%);
  display: flex;
  align-items: center;
  overflow: hidden;
}

.banner::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -10%;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255,255,255,0.08) 0%, transparent 70%);
}

.banner::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -5%;
  width: 400px;
  height: 400px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(245,158,11,0.15) 0%, transparent 70%);
}

.banner-content {
  position: relative;
  z-index: 2;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 80px 20px;
  color: white;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.banner-text h1 {
  font-size: 2.8rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 16px;
}

.banner-text h1 .highlight {
  color: var(--accent-orange);
}

.banner-text .subtitle {
  font-size: 1.1rem;
  opacity: 0.9;
  margin-bottom: 32px;
  line-height: 1.7;
}

.banner-stats {
  display: flex;
  gap: 32px;
  margin-bottom: 32px;
}

.banner-stat {
  text-align: center;
}

.banner-stat .number {
  font-size: 2rem;
  font-weight: 800;
  color: var(--accent-orange);
  display: block;
}

.banner-stat .label {
  font-size: 0.8rem;
  opacity: 0.8;
}

.banner-buttons {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.banner-image {
  position: relative;
}

.banner-image .img-placeholder {
  width: 100%;
  aspect-ratio: 4/3;
  background: rgba(255,255,255,0.1);
  border-radius: var(--radius-xl);
  border: 2px solid rgba(255,255,255,0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.banner-image .img-placeholder .emoji-large {
  font-size: 6rem;
  opacity: 0.7;
}

.banner-float-card {
  position: absolute;
  background: rgba(255,255,255,0.15);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: var(--radius-lg);
  padding: 16px 20px;
  color: white;
  font-size: 0.85rem;
  box-shadow: var(--shadow-lg);
}

.banner-float-card.card-1 {
  bottom: 20px;
  left: -20px;
}

.banner-float-card.card-2 {
  top: 20px;
  right: -20px;
}

/* ========== 通用板块 ========== */
.section {
  padding: 80px 0;
}

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

/* ========== 卡片网格 ========== */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}

.card {
  background: white;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  overflow: hidden;
  transition: all 0.3s;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-light);
}

.card-image {
  width: 100%;
  aspect-ratio: 16/10;
  background: var(--bg-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  position: relative;
  overflow: hidden;
}

.card-image .card-tag {
  position: absolute;
  top: 12px;
  left: 12px;
  padding: 4px 12px;
  border-radius: 100px;
  font-size: 0.75rem;
  font-weight: 600;
  color: white;
}

.card-image .card-tag.orange { background: var(--accent-orange); }
.card-image .card-tag.green { background: var(--accent-green); }
.card-image .card-tag.purple { background: var(--accent-purple); }
.card-image .card-tag.pink { background: var(--accent-pink); }
.card-image .card-tag.teal { background: var(--accent-teal); }
.card-image .card-tag.blue { background: var(--primary); }

.card-body {
  padding: 20px;
}

.card-body h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.card-body p {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 16px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-body .card-link {
  color: var(--primary);
  font-weight: 600;
  font-size: 0.875rem;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: gap 0.2s;
}

.card-body .card-link:hover {
  gap: 8px;
}

/* ========== 亮点区域 ========== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.feature-item {
  text-align: center;
  padding: 32px 20px;
  border-radius: var(--radius-lg);
  background: white;
  border: 1px solid var(--border);
  transition: all 0.3s;
}

.feature-item:hover {
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-light);
}

.feature-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 16px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
}

.feature-icon.blue { background: #eff6ff; }
.feature-icon.orange { background: #fffbeb; }
.feature-icon.green { background: #ecfdf5; }
.feature-icon.purple { background: #f5f3ff; }

.feature-item h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.feature-item p {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ========== 产品区域标签 ========== */
.zone-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 12px;
}

.zone-tag {
  padding: 12px 16px;
  background: white;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  text-align: center;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all 0.2s;
  cursor: default;
}

.zone-tag:hover {
  border-color: var(--primary-light);
  color: var(--primary);
  background: var(--primary-bg);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.zone-tag .icon {
  display: block;
  font-size: 1.5rem;
  margin-bottom: 6px;
}

/* ========== 关于页面 ========== */
.about-hero {
  margin-top: var(--header-height);
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
  color: white;
  padding: 80px 0;
  text-align: center;
}

.about-hero h1 {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 16px;
}

.about-hero p {
  font-size: 1.1rem;
  opacity: 0.9;
  max-width: 700px;
  margin: 0 auto;
}

.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  padding: 60px 0;
}

.about-content.reverse {
  direction: rtl;
}

.about-content.reverse > * {
  direction: ltr;
}

.about-text h2 {
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.about-text p {
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 16px;
}

.about-visual {
  background: var(--bg-light);
  border-radius: var(--radius-xl);
  aspect-ratio: 4/3;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 5rem;
  overflow: hidden;
}

/* ========== 面包屑 ========== */
.breadcrumb {
  padding: 16px 0;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.breadcrumb a {
  color: var(--text-muted);
}

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

.breadcrumb .sep {
  margin: 0 8px;
}

/* ========== 详情页 ========== */
.page-hero {
  margin-top: var(--header-height);
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
  color: white;
  padding: 60px 0;
  text-align: center;
}

.page-hero h1 {
  font-size: 2.2rem;
  font-weight: 800;
}

.detail-content {
  padding: 60px 0;
}

.detail-content .container {
  max-width: 800px;
}

.detail-content h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin: 32px 0 12px;
  color: var(--text-primary);
}

.detail-content h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin: 24px 0 10px;
  color: var(--text-primary);
}

.detail-content p {
  color: var(--text-secondary);
  line-height: 1.9;
  margin-bottom: 16px;
  font-size: 1rem;
}

.detail-content ul {
  list-style: disc;
  padding-left: 24px;
  margin-bottom: 16px;
  color: var(--text-secondary);
  line-height: 1.9;
}

.detail-content ul li {
  margin-bottom: 6px;
}

.detail-image {
  width: 100%;
  aspect-ratio: 16/9;
  background: var(--bg-light);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 4rem;
  margin: 24px 0;
  overflow: hidden;
}

/* ========== 联系表单 ========== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
}

.contact-info h2 {
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.contact-info p {
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 24px;
}

.contact-detail {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 20px;
}

.contact-detail .icon {
  width: 44px;
  height: 44px;
  background: var(--primary-bg);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  flex-shrink: 0;
}

.contact-detail .info h4 {
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 2px;
}

.contact-detail .info span {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.form-card {
  background: white;
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 32px;
  box-shadow: var(--shadow);
}

.form-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 24px;
}

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

.form-group label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--text-primary);
}

.form-group label .required {
  color: #ef4444;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.925rem;
  color: var(--text-primary);
  background: white;
  transition: border-color 0.2s, box-shadow 0.2s;
}

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

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

.form-submit {
  width: 100%;
  padding: 14px;
  background: var(--primary);
  color: white;
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 600;
  transition: all 0.25s;
}

.form-submit:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.form-result {
  margin-top: 16px;
  padding: 12px 16px;
  border-radius: var(--radius);
  font-size: 0.875rem;
  display: none;
}

.form-result.success {
  display: block;
  background: #ecfdf5;
  color: #059669;
  border: 1px solid #a7f3d0;
}

.form-result.error {
  display: block;
  background: #fef2f2;
  color: #dc2626;
  border: 1px solid #fecaca;
}

/* ========== CTA区域 ========== */
.cta-section {
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
  color: white;
  text-align: center;
  padding: 80px 0;
}

.cta-section h2 {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 16px;
}

.cta-section p {
  font-size: 1.1rem;
  opacity: 0.9;
  max-width: 600px;
  margin: 0 auto 32px;
}

/* ========== 时间线 (发展历程) ========== */
.timeline {
  position: relative;
  padding: 20px 0;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--border);
  transform: translateX(-50%);
}

.timeline-item {
  display: flex;
  align-items: flex-start;
  margin-bottom: 40px;
  position: relative;
}

.timeline-item:nth-child(odd) {
  flex-direction: row-reverse;
}

.timeline-item .year {
  flex: 1;
  text-align: right;
  padding-right: 32px;
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--primary);
}

.timeline-item:nth-child(odd) .year {
  text-align: left;
  padding-left: 32px;
  padding-right: 0;
}

.timeline-item .dot {
  position: absolute;
  left: 50%;
  top: 8px;
  width: 16px;
  height: 16px;
  background: var(--primary);
  border: 3px solid white;
  border-radius: 50%;
  transform: translateX(-50%);
  box-shadow: var(--shadow);
}

.timeline-item .content {
  flex: 1;
  padding-left: 32px;
}

.timeline-item:nth-child(odd) .content {
  padding-right: 32px;
  padding-left: 0;
}

.timeline-item .content h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 6px;
}

.timeline-item .content p {
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.6;
}

/* ========== 团队网格 ========== */
.team-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 24px;
}

.team-card {
  text-align: center;
  background: white;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  padding: 32px 20px;
  transition: all 0.3s;
}

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

.team-avatar {
  width: 96px;
  height: 96px;
  border-radius: 50%;
  background: var(--bg-light);
  margin: 0 auto 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.5rem;
}

.team-card h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.team-card .role {
  color: var(--primary);
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 8px;
}

.team-card p {
  color: var(--text-muted);
  font-size: 0.8rem;
  line-height: 1.5;
}

/* ========== 新闻列表 ========== */
.news-meta {
  display: flex;
  gap: 16px;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.news-meta span {
  display: flex;
  align-items: center;
  gap: 4px;
}

/* ========== 分页 ========== */
.pagination {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 48px;
}

.pagination a,
.pagination span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius);
  font-size: 0.875rem;
  font-weight: 500;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  transition: all 0.2s;
}

.pagination a:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.pagination .active {
  background: var(--primary);
  border-color: var(--primary);
  color: white;
}

/* ========== 响应式 ========== */
@media (max-width: 1024px) {
  .banner-content {
    grid-template-columns: 1fr;
    gap: 40px;
    text-align: center;
  }

  .banner-stats {
    justify-content: center;
  }

  .banner-buttons {
    justify-content: center;
  }

  .banner-image {
    max-width: 400px;
    margin: 0 auto;
  }

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

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

  .about-content {
    grid-template-columns: 1fr;
    gap: 40px;
  }

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

  .timeline::before {
    left: 24px;
  }

  .timeline-item,
  .timeline-item:nth-child(odd) {
    flex-direction: column;
    padding-left: 56px;
  }

  .timeline-item .year,
  .timeline-item:nth-child(odd) .year {
    text-align: left;
    padding: 0;
    margin-bottom: 8px;
    font-size: 1.2rem;
  }

  .timeline-item .dot {
    left: 24px;
  }

  .timeline-item .content,
  .timeline-item:nth-child(odd) .content {
    padding: 0;
  }
}

@media (max-width: 768px) {
  .menu-toggle {
    display: flex;
  }

  .nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    background: white;
    flex-direction: column;
    padding: 24px;
    gap: 8px;
    transform: translateX(100%);
    transition: transform 0.3s;
    z-index: 999;
  }

  .nav.active {
    transform: translateX(0);
  }

  .nav a {
    font-size: 1rem;
    padding: 12px 16px;
  }

  .banner-text h1 {
    font-size: 2rem;
  }

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

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

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

  .section-header h2 {
    font-size: 1.5rem;
  }

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

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

@media (max-width: 480px) {
  .zone-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

/* ========== 页面过渡动画 ========== */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s, transform 0.6s;
}

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

/* ========== 返回顶部 ========== */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 44px;
  height: 44px;
  background: var(--primary);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s;
  z-index: 999;
  cursor: pointer;
  border: none;
}

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

.back-to-top:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
}