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

:root {
  --primary: #3b82f6;
  --primary-light: #60a5fa;
  --primary-dark: #2563eb;
  --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;
  --white: #ffffff;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --radius: 8px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;
  --transition: all 0.3s ease;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', Helvetica, Arial, sans-serif;
  color: var(--gray-800);
  line-height: 1.6;
  background: var(--white);
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.gradient-bg {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
}

/* 顶部导航栏 */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: var(--white);
  box-shadow: var(--shadow-sm);
  z-index: 1000;
}

.header-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 40px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--gray-800);
}

.logo-icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius);
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-size: 20px;
}

.logo-text {
  font-size: 20px;
  font-weight: 700;
  -webkit-background-clip: text;
  background-clip: text;
  color: #3b82f6;
}

.header-nav {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-item {
  text-decoration: none;
  color: var(--gray-700);
  font-size: 15px;
  font-weight: 500;
  transition: var(--transition);
}

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

.nav-dropdown {
  position: relative;
}

.dropdown-btn {
  display: flex;
  align-items: center;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  font-size: 15px;
  font-weight: 500;
  color: var(--gray-700);
  transition: var(--transition);
}

.dropdown-btn:hover {
  color: var(--primary);
}

.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  margin-top: 8px;
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  padding: 8px 0;
  min-width: 180px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: var(--transition);
}

.nav-dropdown:hover .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-item {
  display: block;
  padding: 10px 20px;
  text-decoration: none;
  color: var(--gray-700);
  font-size: 14px;
  transition: var(--transition);
}

.dropdown-item:hover {
  background: var(--gray-50);
  color: var(--primary);
}

.header-right {
  display: flex;
  align-items: center;
  gap: 16px;
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  font-size: 24px;
  color: var(--gray-700);
  cursor: pointer;
}

/* Mobile Menu */
.mobile-menu {
  display: none;
  position: fixed;
  top: 64px;
  left: 0;
  right: 0;
  background: var(--white);
  box-shadow: var(--shadow-md);
  padding: 16px 24px;
  z-index: 999;
}

.mobile-menu.active {
  display: block;
}

.mobile-nav-item {
  display: block;
  padding: 12px 0;
  text-decoration: none;
  color: var(--gray-700);
  font-size: 16px;
  border-bottom: 1px solid var(--gray-100);
}

/* 按钮样式 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 20px;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition);
  border: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  color: var(--white);
}

.btn-primary:hover {
  opacity: 0.9;
  transform: translateY(-1px);
}

.btn-outline {
  background: var(--white);
  color: var(--primary);
  border: 1px solid var(--primary);
}

.btn-outline:hover {
  background: var(--gray-50);
}

.btn-text {
  background: none;
  color: var(--gray-700);
}

.btn-text:hover {
  color: var(--primary);
}

.btn-lg {
  padding: 14px 32px;
  font-size: 16px;
}

.btn-block {
  display: block;
  width: 100%;
}

/* Hero 区域 */
.hero {
  position: relative;
  padding: 120px 0 80px;
  background: linear-gradient(10deg, #ECF2FD 0%, #ffffff 100%);
  overflow: hidden;
}


.download-section {
  text-align: center;
}

.download-title {
  font-size: 44px;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 16px;
  line-height: 1.2;
}

.download-subtitle {
  font-size: 18px;
  color: var(--gray-600);
  margin-bottom: 16px;
}

.download-meta {
  font-size: 13px;
  color: var(--gray-500);
  margin-bottom: 48px;
}

.meta-link {
  color: var(--primary);
  text-decoration: none;
  margin: 0 8px;
}

.meta-link:hover {
  text-decoration: underline;
}

/* 平台卡片区域 */
.platform-cards {
  display: flex;
  justify-content: center;
  gap: 24px;
  flex-wrap: wrap;
}

.platform-card {
  position: relative;
  width: 160px;
  height: 180px;
  background: var(--white);
  border-radius: var(--radius-xl);
  padding: 24px 16px;
  box-shadow: var(--shadow-sm);
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

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

/* 默认显示的内容 */
.card-default-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.platform-card:hover .card-default-content {
  opacity: 0;
  transform: scale(0.9);
  pointer-events: none;
}

.platform-icon {
  width: 72px;
  height: 72px;
  margin: 0 auto 12px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.platform-icon img {
  width: 80%;
  height: 80%;
}

.platform-name {
  font-size: 14px;
  color: var(--gray-700);
  font-weight: 500;
  text-align: center;
}

/* 下载按钮 - 绝对定位不占空间 */
.platform-card .download-btn {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0.8);
  width: 60px;
  height: 60px;
  background: var(--white);
  color: var(--primary);
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease, transform 0.3s ease, background 0.2s ease, color 0.2s ease;
}

.platform-card .download-btn i {
  font-size: 40px;
}
.platform-card .download-btn span {
  font-size: 14px;
  color: var(--gray-700);
  margin-top: 4px;
}

.platform-card:hover .download-btn {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1);
  pointer-events: auto;
}

.platform-card .download-btn:hover {
  background: none;
  /* color: var(--white); */
}

.platform-card .download-btn:disabled {
  opacity: 0.7;
  cursor: not-allowed;
}

/* 二维码容器 - 绝对定位不占空间 */
.qr-code-container {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0.8);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.platform-card:hover .qr-code-container {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1);
  pointer-events: auto;
}

.qr-code {
  background: var(--white);
  padding: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.qr-code canvas,
.qr-code img {
  display: block;
}

.beta-badge {
  position: absolute;
  top: 12px;
  right: 12px;
  background: #8B5CF6;
  color: var(--white);
  font-size: 11px;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  font-weight: 600;
}

/* 产品能力展示 */
.product-showcase {
  padding: 60px 0;
  background: var(--white);
}

.showcase-title {
  font-size: 28px;
  font-weight: 600;
  color: var(--gray-900);
  text-align: center;
  margin-bottom: 40px;
}

.showcase-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.showcase-card {
  background: #f8fafc;
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: var(--transition);
}

.showcase-card:hover {
  background: var(--white);
  box-shadow: var(--shadow-md);
}

.showcase-badge {
  display: inline-block;
  background: rgba(139, 92, 246, 0.1);
  color: #8B5CF6;
  font-size: 12px;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  margin-bottom: 16px;
  font-weight: 500;
}

.showcase-card h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--gray-900);
  margin-bottom: 8px;
}

.showcase-card p {
  font-size: 14px;
  color: var(--gray-600);
  margin-bottom: 16px;
}

.showcase-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  color: var(--primary);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: var(--transition);
}

.showcase-link:hover {
  gap: 8px;
}

/* 核心功能展示 */
.features {
  padding: 80px 0;
  background: var(--white);
}

.section-header {
  text-align: center;
  margin-bottom: 60px;
}

.section-title {
  font-size: 36px;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 16px;
}

.section-subtitle {
  font-size: 18px;
  color: var(--gray-500);
  max-width: 600px;
  margin: 0 auto;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.feature-card {
  background: var(--white);
  padding: 32px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--gray-200);
  transition: var(--transition);
}

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

.feature-icon {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  color: var(--white);
  font-size: 24px;
}

.feature-card h3 {
  font-size: 20px;
  font-weight: 600;
  color: var(--gray-900);
  margin-bottom: 12px;
}

.feature-card > p {
  color: var(--gray-600);
  margin-bottom: 20px;
  line-height: 1.6;
}

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

.feature-list li {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 0;
  color: var(--gray-700);
  font-size: 14px;
}

.feature-list li i {
  color: var(--primary);
}

/* WebSDK 区域 */
.websdk {
  padding: 80px 0;
  background: var(--gray-50);
}

.websdk-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  margin-bottom: 80px;
  align-items: start;
}

.code-block {
  background: var(--gray-800);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.code-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  background: rgba(0, 0, 0, 0.2);
}

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

.dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}

.dot.red { background: #ff5f57; }
.dot.yellow { background: #ffbd2e; }
.dot.green { background: #28ca41; }

.code-copy-btn {
  background: none;
  border: none;
  color: var(--gray-400);
  cursor: pointer;
  font-size: 18px;
  transition: var(--transition);
}

.code-copy-btn:hover {
  color: var(--white);
}

.code-block pre {
  margin: 0;
  padding: 20px;
  overflow-x: auto;
  font-family: 'Fira Code', 'Consolas', monospace;
  font-size: 14px;
  line-height: 1.7;
  color: var(--gray-300);
}

.code-comment { color: var(--gray-500); }
.code-keyword { color: #93c5fd; }
.code-string { color: #86efac; }
.code-function { color: #c4b5fd; }
.code-variable { color: #f9a8d4; }

.websdk-info h3 {
  font-size: 24px;
  font-weight: 600;
  color: var(--gray-900);
  margin-bottom: 16px;
}

.websdk-info > p {
  color: var(--gray-600);
  margin-bottom: 24px;
  line-height: 1.7;
}

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

.websdk-list li {
  display: flex;
  gap: 12px;
  margin-bottom: 20px;
}

.websdk-list-icon {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: rgba(59, 130, 246, 0.1);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 12px;
  margin-top: 2px;
}

.websdk-list li h4 {
  font-size: 16px;
  font-weight: 500;
  color: var(--gray-900);
  margin-bottom: 4px;
}

.websdk-list li p {
  font-size: 14px;
  color: var(--gray-600);
}

.websdk-advantages h3 {
  font-size: 24px;
  font-weight: 600;
  color: var(--gray-900);
  text-align: center;
  margin-bottom: 40px;
}

.advantages-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.advantage-card {
  background: var(--white);
  padding: 32px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--gray-200);
  text-align: center;
  transition: var(--transition);
}

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

.advantage-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  color: var(--white);
  font-size: 20px;
}

.advantage-card h4 {
  font-size: 18px;
  font-weight: 600;
  color: var(--gray-900);
  margin-bottom: 12px;
}

.advantage-card p {
  font-size: 14px;
  color: var(--gray-600);
  line-height: 1.6;
}

/* 价格区域 */
.pricing {
  padding: 80px 0;
  background: var(--white);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  align-items: start;
}

.pricing-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 32px;
  border: 1px solid var(--gray-200);
  text-align: center;
  transition: var(--transition);
  position: relative;
}

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

.pricing-card.featured {
  border-color: var(--primary);
  box-shadow: var(--shadow-lg);
}

.pricing-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--primary);
  color: var(--white);
  padding: 4px 16px;
  border-radius: var(--radius-full);
  font-size: 12px;
  font-weight: 600;
}

.pricing-header h3 {
  font-size: 20px;
  font-weight: 600;
  color: var(--gray-900);
  margin-bottom: 8px;
}

.pricing-price {
  font-size: 36px;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 24px;
}

.pricing-price span {
  font-size: 16px;
  font-weight: 400;
  color: var(--gray-500);
}

.pricing-features {
  list-style: none;
  margin-bottom: 32px;
  text-align: left;
}

.pricing-features li {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 0;
  color: var(--gray-700);
  font-size: 14px;
  border-bottom: 1px solid var(--gray-100);
}

.pricing-features li:last-child {
  border-bottom: none;
}

.pricing-features li i {
  color: var(--primary);
  font-size: 16px;
}

/* 客户评价 */
.testimonials {
  padding: 80px 0;
  background: var(--gray-50);
}

.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.testimonial-card {
  background: var(--white);
  padding: 32px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

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

.testimonial-rating {
  display: flex;
  gap: 4px;
  margin-bottom: 16px;
  color: #fbbf24;
}

.testimonial-text {
  color: var(--gray-600);
  font-size: 15px;
  line-height: 1.7;
  margin-bottom: 24px;
}

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

.author-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-weight: 600;
  font-size: 16px;
}

.author-name {
  font-weight: 600;
  color: var(--gray-900);
  font-size: 14px;
}

.author-role {
  color: var(--gray-500);
  font-size: 13px;
}

/* Footer */
.footer {
  background: var(--gray-900);
  padding: 32px 0 32px;
  color: var(--gray-400);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 40px;
  margin-bottom: 40px;
}

.footer-column h4 {
  color: var(--white);
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 20px;
}

.footer-link {
  display: block;
  color: var(--gray-400);
  text-decoration: none;
  font-size: 14px;
  padding: 6px 0;
  transition: var(--transition);
}

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

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;


}

.footer-bottom p {
  font-size: 14px;
}

.footer-social {
  display: flex;
  gap: 16px;
}

.social-link {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--gray-800);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--gray-400);
  font-size: 18px;
  transition: var(--transition);
  text-decoration: none;
}

.social-link:hover {
  background: var(--primary);
  color: var(--white);
}

/* 响应式设计 */
@media (max-width: 1024px) {
  .platform-cards {
    gap: 16px;
  }
  
  .platform-card {
    width: 130px;
  }
  
  .features-grid,
  .advantages-grid,
  .pricing-grid,
  .testimonials-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .websdk-content {
    grid-template-columns: 1fr;
  }

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

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

@media (max-width: 768px) {
  .header-nav {
    display: none;
  }

  .mobile-menu-btn {
    display: block;
  }

  .hero {
    padding: 100px 0 60px;
  }

  .download-title {
    font-size: 32px;
  }

  .download-subtitle {
    font-size: 16px;
  }

  .platform-card {
    width: 120px;
    height: 150px;
    padding: 20px 12px;
  }

  .platform-icon {
    width: 56px;
    height: 56px;
  }

  .platform-card .download-btn {
    width: 50px;
    height: 50px;
  }

  .platform-card .download-btn i {
    font-size: 24px;
  }

  .section-title {
    font-size: 28px;
  }

  .features-grid,
  .advantages-grid,
  .pricing-grid,
  .testimonials-grid {
    grid-template-columns: 1fr;
  }

  .showcase-cards {
    grid-template-columns: 1fr;
  }

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

  .footer-bottom {
    flex-direction: column;
    gap: 16px;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

  .platform-cards {
    gap: 12px;
  }

  .platform-card {
    width: calc(50% - 6px);
    height: 150px;
  }

  .platform-name {
    font-size: 12px;
  }

  .feature-card,
  .pricing-card,
  .testimonial-card {
    padding: 24px;
  }

  /* 移动端优化：始终显示下载按钮/二维码 */
  .platform-card .card-default-content {
    opacity: 1;
    transform: scale(1);
    pointer-events: auto;
  }

  .platform-card .download-btn,
  .platform-card .qr-code-container {
    opacity: 0;
    transform: translate(-50%, -50%) scale(0.8);
    pointer-events: none;
  }
}

/* 可访问性：键盘导航支持 */
.platform-card:focus-within .card-default-content {
  opacity: 0;
  transform: scale(0.9);
  pointer-events: none;
}

.platform-card:focus-within .download-btn,
.platform-card:focus-within .qr-code-container {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1);
  pointer-events: auto;
}

.platform-card .download-btn:focus {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

/* 减少动画偏好设置 */
@media (prefers-reduced-motion: reduce) {
  .platform-card .download-btn,
  .qr-code-container {
    transition: none;
  }
}