:root {
  --telegram-color: #0088cc;
  --signal-color: #3a76f0;
  --background: #f5f5f5;
  --card-background: #ffffff;
  --text-primary: #333333;
  --text-secondary: #666666;
  --border-radius: 12px;
  --transition: all 0.3s ease;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  background: var(--background);
  color: var(--text-primary);
  line-height: 1.6;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
}

header {
  text-align: center;
  margin-bottom: 3rem;
}

h1 {
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
}

.subtitle {
  color: var(--text-secondary);
  font-size: 1.1rem;
}

.contact-section {
  margin-bottom: 3rem;
}

.contact-section h2 {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
  font-size: 1.5rem;
}

.icon {
  width: 24px;
  height: 24px;
  fill: currentColor;
}

.telegram-icon {
  color: var(--telegram-color);
}

.signal-icon {
  color: var(--signal-color);
}

.contact-cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

@media (min-width: 769px) {
  .contact-cards {
    grid-template-columns: 1fr;
    max-width: 600px;
    margin: 0 auto;
  }
}

.contact-card {
  background: var(--card-background);
  border-radius: var(--border-radius);
  padding: 1.5rem;
  text-decoration: none;
  color: var(--text-primary);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  transition: var(--transition);
}

.contact-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.telegram:hover {
  border-left: 4px solid var(--telegram-color);
}

.signal:hover {
  border-left: 4px solid var(--signal-color);
}

.contact-info h3 {
  font-size: 1.2rem;
  margin-bottom: 0.5rem;
}

.contact-info p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

@media (max-width: 768px) {
  .container {
    padding: 1rem;
  }

  h1 {
    font-size: 2rem;
  }

  .contact-card {
    padding: 1.25rem;
  }
}

@media (max-width: 480px) {
  h1 {
    font-size: 1.75rem;
  }

  .subtitle {
    font-size: 1rem;
  }

  .contact-section h2 {
    font-size: 1.25rem;
  }
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
  :root {
    --background: #1a1a1a;
    --card-background: #2d2d2d;
    --text-primary: #ffffff;
    --text-secondary: #b0b0b0;
  }

  .contact-card {
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
  }

  .contact-card:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
  }
}