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

:root {
  --color-primary: #29b6f6;
  --color-primary-dark: #0288d1;
  --color-secondary: #26c6da;
  --color-accent: #ffa726;
  --color-success: #66bb6a;
  --color-bg: #fafbfc;
  --color-bg-light: #ffffff;
  --color-text: #2c3e50;
  --color-text-light: #546e7a;
  --color-text-muted: #90a4ae;
  --color-border: #e0e6ed;
  --radius: 12px;
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.12);
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Microsoft YaHei', 'PingFang SC', sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  font-size: 16px;
}

.container {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 20px;
}

a {
  text-decoration: none;
  color: var(--color-primary);
  transition: color 0.2s;
}

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

.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

.navbar-container {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text);
}

.navbar-brand svg {
  flex-shrink: 0;
}

.navbar-menu {
  display: flex;
  align-items: center;
  gap: 8px;
  list-style: none;
}

.navbar-menu a {
  padding: 10px 20px;
  border-radius: 8px;
  font-weight: 500;
  color: var(--color-text-light);
  transition: all 0.2s;
}

.navbar-menu a:hover {
  background: rgba(41, 182, 246, 0.08);
  color: var(--color-primary);
}

.navbar-menu a.active {
  background: rgba(41, 182, 246, 0.12);
  color: var(--color-primary);
  font-weight: 600;
}

.hero {
  padding: 80px 20px;
  text-align: center;
  background: linear-gradient(135deg, #e3f2fd 0%, #fff9c4 100%);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -40%;
  right: -10%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(41,182,246,0.1) 0%, transparent 70%);
  border-radius: 50%;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -40%;
  left: -10%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(255,167,38,0.08) 0%, transparent 70%);
  border-radius: 50%;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 900px;
  margin: 0 auto;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: white;
  padding: 8px 18px;
  border-radius: 50px;
  font-size: 0.9rem;
  color: var(--color-text-light);
  box-shadow: var(--shadow-sm);
  margin-bottom: 24px;
}

.hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 20px;
  color: var(--color-text);
}

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

.hero-subtitle {
  font-size: 1.2rem;
  color: var(--color-text-light);
  margin-bottom: 36px;
  line-height: 1.6;
}

.hero-buttons {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 48px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 10px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all 0.25s;
  text-decoration: none;
}

.btn-primary {
  background: var(--color-primary);
  color: white;
  box-shadow: 0 4px 14px rgba(41, 182, 246, 0.3);
}

.btn-primary:hover {
  background: var(--color-primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(41, 182, 246, 0.4);
  color: white;
}

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

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

.hero-features {
  display: flex;
  justify-content: center;
  gap: 32px;
  flex-wrap: wrap;
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

.hero-features span {
  display: flex;
  align-items: center;
  gap: 6px;
}

.section {
  padding: 80px 20px;
}

.section-header {
  text-align: center;
  margin-bottom: 56px;
}

.section-label {
  display: inline-block;
  background: rgba(41, 182, 246, 0.1);
  color: var(--color-primary);
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 16px;
}

.section-title {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 800;
  margin-bottom: 16px;
  color: var(--color-text);
}

.section-desc {
  font-size: 1.1rem;
  color: var(--color-text-light);
  max-width: 720px;
  margin: 0 auto;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
  margin-top: 48px;
}

.feature-card {
  background: var(--color-bg-light);
  border-radius: var(--radius);
  padding: 32px;
  border: 1px solid var(--color-border);
  transition: all 0.3s;
}

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

.feature-icon {
  width: 56px;
  height: 56px;
  background: linear-gradient(135deg, rgba(41,182,246,0.1), rgba(38,198,218,0.1));
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.feature-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--color-text);
}

.feature-card p {
  color: var(--color-text-light);
  line-height: 1.7;
}

.feature-list {
  list-style: none;
  margin-top: 16px;
}

.feature-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 8px 0;
  color: var(--color-text-light);
  font-size: 0.95rem;
}

.feature-list li svg {
  flex-shrink: 0;
  margin-top: 2px;
}

.platforms-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
  margin-top: 48px;
}

.platform-card {
  background: var(--color-bg-light);
  border-radius: var(--radius);
  padding: 36px 28px;
  text-align: center;
  border: 1px solid var(--color-border);
  transition: all 0.3s;
}

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

.platform-card.featured {
  border: 2px solid var(--color-primary);
  background: linear-gradient(135deg, rgba(41,182,246,0.05), rgba(38,198,218,0.05));
}

.platform-icon {
  width: 72px;
  height: 72px;
  margin: 0 auto 20px;
  background: linear-gradient(135deg, rgba(41,182,246,0.1), rgba(38,198,218,0.1));
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.platform-card h3 {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.platform-version {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  margin-bottom: 20px;
}

.platform-badge {
  display: inline-block;
  background: var(--color-accent);
  color: white;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 4px;
  margin-left: 8px;
}

.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
  margin-top: 48px;
}

.review-card {
  background: var(--color-bg-light);
  border-radius: var(--radius);
  padding: 28px;
  border: 1px solid var(--color-border);
}

.review-rating {
  display: flex;
  gap: 4px;
  margin-bottom: 16px;
}

.review-text {
  font-size: 1rem;
  color: var(--color-text);
  line-height: 1.7;
  margin-bottom: 20px;
  font-style: italic;
}

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

.review-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.1rem;
}

.review-author-info h4 {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 2px;
}

.review-author-info p {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.faq-container {
  max-width: 860px;
  margin: 0 auto;
}

.faq-item {
  background: var(--color-bg-light);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
}

.faq-question {
  width: 100%;
  padding: 20px 24px;
  background: none;
  border: none;
  text-align: left;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
  transition: all 0.2s;
}

.faq-question:hover {
  background: rgba(41, 182, 246, 0.04);
}

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

.faq-icon {
  flex-shrink: 0;
  transition: transform 0.3s;
}

.faq-question.open .faq-icon {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease;
}

.faq-answer-content {
  padding: 0 24px 20px;
  color: var(--color-text-light);
  line-height: 1.8;
}

.cta-section {
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  color: white;
  text-align: center;
  padding: 70px 20px;
}

.cta-section h2 {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 800;
  margin-bottom: 16px;
}

.cta-section p {
  font-size: 1.15rem;
  opacity: 0.95;
  margin-bottom: 32px;
}

.cta-buttons {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
}

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

.cta-section .btn-primary:hover {
  background: #f5f5f5;
  color: var(--color-primary-dark);
}

.cta-section .btn-outline {
  border-color: white;
  color: white;
}

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

.footer {
  background: var(--color-bg-light);
  border-top: 1px solid var(--color-border);
  padding: 40px 20px;
  text-align: center;
}

.footer-nav {
  display: flex;
  justify-content: center;
  gap: 24px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.footer-nav a {
  color: var(--color-text-light);
  font-size: 0.9rem;
}

.footer-verify {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(102, 187, 106, 0.1);
  color: var(--color-success);
  padding: 10px 20px;
  border-radius: 8px;
  font-size: 0.9rem;
  margin-bottom: 16px;
}

.footer-copyright {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

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

@media (max-width: 768px) {
  .navbar-container {
    height: 60px;
  }

  .navbar-brand {
    font-size: 1.1rem;
  }

  .navbar-menu a {
    padding: 8px 14px;
    font-size: 0.9rem;
  }

  .hero {
    padding: 60px 20px;
  }

  .hero-buttons {
    flex-direction: column;
    align-items: stretch;
  }

  .btn {
    justify-content: center;
  }

  .section {
    padding: 60px 20px;
  }

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

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

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