* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: linear-gradient(135deg, #0f1a3c 0%, #1a2a5c 50%, #0d1f3f 100%);
  color: #1a1a1a;
  line-height: 1.6;
  min-height: 100vh;
}

/* ===== 导航栏 ===== */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(15, 26, 60, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(100, 150, 255, 0.2);
  padding: 0 20px;
}

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

.logo {
  font-size: 24px;
  font-weight: 700;
  color: #fff;
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 8px;
}

.logo-icon {
  width: 32px;
  height: 32px;
  display: inline-block;
}

.nav-links {
  display: flex;
  gap: 40px;
  list-style: none;
}

.nav-links a {
  color: rgba(255, 255, 255, 0.7);
  text-decoration: none;
  font-size: 15px;
  font-weight: 500;
  transition: color 0.3s ease;
  position: relative;
}

.nav-links a:hover {
  color: #fff;
}

.nav-links a.active {
  color: #6495ff;
  font-weight: 600;
}

.nav-links a.active::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 0;
  right: 0;
  height: 2px;
  background: #6495ff;
  border-radius: 1px;
}

/* ===== Hero 区域 ===== */
.hero {
  max-width: 1200px;
  margin: 0 auto;
  padding: 80px 20px;
  text-align: center;
  color: #fff;
}

.hero-title {
  font-size: 48px;
  font-weight: 700;
  margin-bottom: 20px;
  background: linear-gradient(135deg, #fff 0%, #b3d9ff 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 20px;
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: 40px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.hero-actions {
  display: flex;
  gap: 20px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 60px;
}

/* ===== 按钮样式 ===== */
.btn {
  padding: 14px 32px;
  border: none;
  border-radius: 8px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
}

.btn-primary {
  background: linear-gradient(135deg, #6495ff 0%, #4a7cff 100%);
  color: #fff;
  box-shadow: 0 8px 24px rgba(100, 149, 255, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(100, 149, 255, 0.4);
}

.btn-primary:disabled {
  opacity: 0.8;
  cursor: not-allowed;
}

.btn-outline {
  background: transparent;
  color: #6495ff;
  border: 2px solid #6495ff;
}

.btn-outline:hover {
  background: rgba(100, 149, 255, 0.1);
  transform: translateY(-2px);
}

.btn-lg {
  padding: 16px 40px;
  font-size: 18px;
}

.btn-sm {
  padding: 10px 20px;
  font-size: 14px;
}

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

.section {
  padding: 80px 20px;
  background: #fff;
  margin-bottom: 0;
}

.section:nth-child(odd) {
  background: #f8f9fc;
}

.section-title {
  font-size: 36px;
  font-weight: 700;
  color: #0f1a3c;
  margin-bottom: 50px;
  text-align: center;
}

.section-label {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  color: #6495ff;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 12px;
}

/* ===== 特性卡片网格 ===== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 30px;
  margin-bottom: 40px;
}

.feature-card {
  background: #fff;
  border-radius: 12px;
  padding: 32px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
  transition: all 0.3s ease;
  border: 1px solid rgba(100, 149, 255, 0.1);
}

.feature-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 12px 32px rgba(100, 149, 255, 0.15);
  border-color: rgba(100, 149, 255, 0.3);
}

.feature-icon {
  width: 48px;
  height: 48px;
  margin-bottom: 20px;
  color: #6495ff;
}

.feature-card h3 {
  font-size: 20px;
  color: #0f1a3c;
  margin-bottom: 12px;
}

.feature-card p {
  font-size: 15px;
  color: #666;
  line-height: 1.8;
}

/* ===== 平台下载区 ===== */
.platforms-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  margin-bottom: 40px;
}

.platform-card {
  background: #fff;
  border-radius: 12px;
  padding: 28px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
  text-align: center;
  transition: all 0.3s ease;
  border: 1px solid rgba(100, 149, 255, 0.1);
}

.platform-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 10px 28px rgba(100, 149, 255, 0.12);
}

.platform-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 16px;
  color: #6495ff;
}

.platform-card h3 {
  font-size: 18px;
  color: #0f1a3c;
  margin-bottom: 8px;
}

.platform-card p {
  font-size: 13px;
  color: #999;
  margin-bottom: 20px;
}

/* ===== 深度功能介绍 ===== */
.feature-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  margin-bottom: 80px;
}

.feature-row:nth-child(even) {
  grid-template-columns: 1fr 1fr;
}

.feature-row:nth-child(even) .feature-content {
  order: 2;
}

.feature-row:nth-child(even) .feature-visual {
  order: 1;
}

.feature-content h2 {
  font-size: 28px;
  color: #0f1a3c;
  margin-bottom: 16px;
}

.feature-content p {
  font-size: 15px;
  color: #666;
  margin-bottom: 16px;
  line-height: 1.8;
}

.feature-visual {
  background: linear-gradient(135deg, rgba(100, 149, 255, 0.1) 0%, rgba(74, 124, 255, 0.05) 100%);
  border-radius: 12px;
  padding: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 300px;
}

.feature-visual svg {
  width: 100%;
  max-width: 280px;
  height: auto;
}

@media (max-width: 768px) {
  .feature-row {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  
  .feature-row:nth-child(even) .feature-content {
    order: 1;
  }
  
  .feature-row:nth-child(even) .feature-visual {
    order: 2;
  }
}

/* ===== 统计区 ===== */
.stats-bar {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 30px;
  margin-bottom: 40px;
}

.stat-item {
  text-align: center;
  padding: 24px;
  background: rgba(100, 149, 255, 0.05);
  border-radius: 12px;
  border: 1px solid rgba(100, 149, 255, 0.1);
}

.stat-number {
  font-size: 32px;
  font-weight: 700;
  color: #6495ff;
  margin-bottom: 8px;
}

.stat-label {
  font-size: 14px;
  color: #666;
}

/* ===== 用户评价 ===== */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
  margin-bottom: 40px;
}

.review-card {
  background: #fff;
  border-radius: 12px;
  padding: 24px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
  border: 1px solid rgba(100, 149, 255, 0.1);
}

.review-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.review-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, #6495ff 0%, #4a7cff 100%);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 16px;
}

.review-name {
  font-weight: 600;
  color: #0f1a3c;
  font-size: 14px;
}

.review-stars {
  color: #ffc107;
  font-size: 12px;
  margin-top: 4px;
}

.review-text {
  font-size: 14px;
  color: #666;
  line-height: 1.8;
}

/* ===== 对比表 ===== */
.comparison-table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 40px;
  background: #fff;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.comparison-table th {
  background: linear-gradient(135deg, #0f1a3c 0%, #1a2a5c 100%);
  color: #fff;
  padding: 16px;
  text-align: left;
  font-weight: 600;
  font-size: 14px;
}

.comparison-table td {
  padding: 16px;
  border-bottom: 1px solid #f0f0f0;
  font-size: 14px;
  color: #666;
}

.comparison-table tr:last-child td {
  border-bottom: none;
}

.comparison-table tr:nth-child(even) {
  background: #f8f9fc;
}

.comparison-table .highlight {
  color: #6495ff;
  font-weight: 600;
}

/* ===== FAQ ===== */
.faq-list {
  list-style: none;
  margin-bottom: 40px;
}

.faq-item {
  background: #fff;
  border-radius: 12px;
  margin-bottom: 16px;
  border: 1px solid rgba(100, 149, 255, 0.1);
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
  transition: all 0.3s ease;
}

.faq-item:hover {
  border-color: rgba(100, 149, 255, 0.3);
  box-shadow: 0 4px 12px rgba(100, 149, 255, 0.1);
}

.faq-q {
  padding: 20px;
  cursor: pointer;
  font-weight: 600;
  color: #0f1a3c;
  display: flex;
  justify-content: space-between;
  align-items: center;
  user-select: none;
  transition: color 0.3s ease;
}

.faq-q:hover {
  color: #6495ff;
}

.faq-chevron {
  width: 20px;
  height: 20px;
  color: #6495ff;
  transition: transform 0.3s ease;
  flex-shrink: 0;
}

.faq-item.open .faq-chevron {
  transform: rotate(180deg);
}

.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
  padding: 0 20px;
}

.faq-item.open .faq-a {
  max-height: 500px;
  padding: 0 20px 20px 20px;
}

.faq-a p {
  font-size: 14px;
  color: #666;
  line-height: 1.8;
}

/* ===== CTA 横幅 ===== */
.cta-banner {
  background: linear-gradient(135deg, #6495ff 0%, #4a7cff 100%);
  color: #fff;
  padding: 60px 20px;
  text-align: center;
  border-radius: 12px;
  margin: 60px 0;
  box-shadow: 0 8px 24px rgba(100, 149, 255, 0.3);
}

.cta-banner h2 {
  font-size: 32px;
  margin-bottom: 16px;
}

.cta-banner p {
  font-size: 16px;
  margin-bottom: 32px;
  opacity: 0.95;
}

/* ===== 页脚 ===== */
.footer {
  background: #0f1a3c;
  color: rgba(255, 255, 255, 0.7);
  padding: 40px 20px;
  text-align: center;
  font-size: 13px;
  line-height: 1.8;
  border-top: 1px solid rgba(100, 149, 255, 0.2);
}

.footer p {
  margin-bottom: 8px;
}

.footer .security {
  color: #6495ff;
  font-weight: 600;
  margin-bottom: 12px;
}

/* ===== 动画 ===== */
@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.feature-card, .platform-card, .review-card {
  animation: fadeIn 0.6s ease forwards;
}

/* ===== 响应式设计 ===== */
@media (max-width: 768px) {
  .hero-title {
    font-size: 32px;
  }
  
  .hero-subtitle {
    font-size: 16px;
  }
  
  .section-title {
    font-size: 28px;
  }
  
  .nav-links {
    gap: 20px;
  }
  
  .features-grid, .platforms-grid, .reviews-grid {
    grid-template-columns: 1fr;
  }
  
  .cta-banner h2 {
    font-size: 24px;
  }
  
  .comparison-table {
    font-size: 12px;
  }
  
  .comparison-table th, .comparison-table td {
    padding: 12px;
  }
}