:root {
  --theme-color: #6cf;
  --bg-color: #ffffff;
  --text-color: #333333;
  --btn-text: #ffffff;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-color: #121212;
    --text-color: #eeeeee;
  }
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue",
    Arial, "Noto Sans", sans-serif;
  background: var(--bg-color) url("../img/bg3.png") no-repeat center top / cover;
  color: var(--text-color);
  line-height: 1.6;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.site-header {
  padding: 24px 16px 16px;
  text-align: center;
}

.logo {
  width: 160px;
  height: auto;
}

.title {
  margin-top: 8px;
  font-size: 1.8rem;
  color: var(--text-color);
}

.preview-section {
  max-width: 480px;
  margin: 0 auto;
  width: 90%;
}

.preview-section img {
  width: 100%;
  display: block;
  border-radius: 12px;
}

.download-section {
  margin: 32px auto;
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.download-section.top {
  margin-top: 24px;
}

.download-btn {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 32px;
  border-radius: 12px;
  background: var(--theme-color);
  color: var(--btn-text);
  font-weight: 600;
  font-size: 1.1rem;
  text-decoration: none;
  transition: all 0.3s ease;
  box-shadow: 0 4px 12px rgba(102, 204, 255, 0.3);
  min-width: 200px;
  justify-content: center;
}

.download-btn img {
  width: 28px;
  height: 28px;
}

.download-btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 20px rgba(102, 204, 255, 0.4);
}

.download-btn.active {
  background: linear-gradient(135deg, var(--theme-color), #4db8ff);
  box-shadow: 0 6px 20px rgba(102, 204, 255, 0.5);
  transform: scale(1.05);
}

.contact-section {
  padding: 32px 16px;
  text-align: center;
  background: rgba(102, 204, 255, 0.05);
  border-top: 1px solid rgba(102, 204, 255, 0.1);
}

@media (prefers-color-scheme: dark) {
  .contact-section {
    background: rgba(102, 204, 255, 0.08);
    border-top: 1px solid rgba(102, 204, 255, 0.15);
  }
}

.contact-container {
  max-width: 480px;
  margin: 0 auto;
}

.contact-title {
  font-size: 1.25rem;
  margin-bottom: 20px;
  color: var(--text-color);
  font-weight: 600;
}

.social-links {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

.social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: var(--theme-color);
  color: var(--btn-text);
  text-decoration: none;
  font-size: 1.5rem;
  transition: all 0.3s ease;
  box-shadow: 0 4px 12px rgba(102, 204, 255, 0.3);
}

.social-link:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 20px rgba(102, 204, 255, 0.4);
  background: linear-gradient(135deg, var(--theme-color), #4db8ff);
}

.site-footer {
  margin-top: auto;
  text-align: center;
  padding: 24px 16px;
  font-size: 0.875rem;
  opacity: 0.75;
}

.site-footer img {
  width: 96px;
  display: block;
  margin: 0 auto 8px;
}

@media (max-width: 600px) {
  .download-btn {
    flex: 1 1 100%;
    max-width: 280px;
    padding: 18px 24px;
    font-size: 1.2rem;
    gap: 16px;
  }
  
  .download-btn img {
    width: 32px;
    height: 32px;
  }
  
  .download-section {
    padding: 0 16px;
  }
  
  .logo {
    width: 120px;
  }
  
  .contact-section {
    padding: 24px 16px;
  }
  
  .contact-title {
    font-size: 1.1rem;
    margin-bottom: 16px;
  }
  
  .social-links {
    gap: 12px;
  }
  
  .social-link {
    width: 44px;
    height: 44px;
    font-size: 1.3rem;
  }
}