/* CSS Custom Properties for theming */
:root {
  /* Light theme */
  --primary-color: #374151;
  --primary-hover: #1f2937;
  --bg-color: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-hover: #f1f5f9;
  --text-color: #1e293b;
  --text-secondary: #64748b;
  --border-color: #e2e8f0;
  --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
}

[data-theme="dark"] {
  /* Dark theme - Grey palette */
  --primary-color: #9ca3af;
  --primary-hover: #6b7280;
  --bg-color: #111827;
  --bg-secondary: #1f2937;
  --bg-hover: #374151;
  --text-color: #f9fafb;
  --text-secondary: #d1d5db;
  --border-color: #374151;
  --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.3), 0 1px 2px 0 rgba(0, 0, 0, 0.2);
}

/* Reset and base styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  line-height: 1.6;
  color: var(--text-color);
  background-color: var(--bg-color);
  transition: background-color 0.3s ease, color 0.3s ease;
  overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.2;
  color: var(--text-color);
}

p {
  margin-bottom: 1rem;
}

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

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

/* Scrollbar styling */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-secondary);
}

/* Focus styles for accessibility */
button:focus-visible,
a:focus-visible {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

/* Loading animation */
@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

.loading {
  animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

/* Responsive breakpoints */
@media (max-width: 640px) {
  html {
    font-size: 14px;
  }
}

@media (min-width: 641px) and (max-width: 1024px) {
  html {
    font-size: 15px;
  }
}

@media (min-width: 1025px) {
  html {
    font-size: 16px;
  }
}

/* Print styles */
@media print {
  * {
    color: black !important;
    background: white !important;
  }

  .header,
  .footer {
    display: none;
  }
}
