:root {
  /* Light theme variables */
  --bg-primary: #ffffff;
  --bg-secondary: #f8f9fa;
  --bg-tertiary: #e9ecef;
  --bg-navbar: rgba(255, 255, 255, 0.95);
  --bg-card: rgba(255, 255, 255, 0.9);
  --bg-overlay: rgba(0, 0, 0, 0.05);
  --bg-section: rgba(0, 0, 0, 0.02);
  --bg-footer: rgba(0, 0, 0, 0.8);

  --text-primary: #1a1a1a;
  --text-secondary: #6c757d;
  --text-muted: #8e9297;

  --border-color: rgba(0, 0, 0, 0.1);
  --border-hover: rgba(255, 70, 85, 0.3);

  --shadow: rgba(0, 0, 0, 0.1);
  --shadow-hover: rgba(0, 0, 0, 0.15);

  --accent-color: #ff4655;
  --accent-hover: #ff6b6b;
  --accent-shadow: rgba(255, 70, 85, 0.4);

  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.5;
  font-weight: 400;

  font-synthesis: none;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;

  /* Smooth theme transitions */
  transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

/* Dark theme variables */
.dark {
  --bg-primary: #0a0a0a;
  --bg-secondary: #1a1a2e;
  --bg-tertiary: #16213e;
  --bg-navbar: rgba(0, 0, 0, 0.9);
  --bg-card: rgba(0, 0, 0, 0.5);
  --bg-overlay: rgba(255, 255, 255, 0.02);
  --bg-section: rgba(255, 255, 255, 0.02);
  --bg-footer: rgba(0, 0, 0, 0.8);

  --text-primary: #ffffff;
  --text-secondary: #b8c5d1;
  --text-muted: #888;

  --border-color: rgba(255, 70, 85, 0.3);
  --border-hover: rgba(255, 70, 85, 0.5);

  --shadow: rgba(0, 0, 0, 0.3);
  --shadow-hover: rgba(255, 70, 85, 0.2);

  --accent-color: #ff4655;
  --accent-hover: #ff6b6b;
  --accent-shadow: rgba(255, 70, 85, 0.4);
}

/* Light theme variables (explicit) */
.light {
  --bg-primary: #ffffff;
  --bg-secondary: #f8f9fa;
  --bg-tertiary: #e9ecef;
  --bg-navbar: rgba(255, 255, 255, 0.95);
  --bg-card: rgba(255, 255, 255, 0.9);
  --bg-overlay: rgba(0, 0, 0, 0.05);

  --text-primary: #1a1a1a;
  --text-secondary: #6c757d;
  --text-muted: #8e9297;

  --border-color: rgba(0, 0, 0, 0.1);
  --border-hover: rgba(255, 70, 85, 0.3);

  --shadow: rgba(0, 0, 0, 0.1);
  --shadow-hover: rgba(0, 0, 0, 0.15);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
  min-width: 320px;
  min-height: 100vh;
  background: inherit;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0;
  font-weight: 600;
}

a {
  font-weight: 500;
  color: var(--primary-red);
  text-decoration: none;
  transition: color 0.3s ease;
}

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

button {
  font-family: inherit;
  cursor: pointer;
  transition: all 0.3s ease;
}

p {
  margin: 0 0 1rem 0;
}

/* Utility classes */
.text-center {
  text-align: center;
}

.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }

/* Animation utilities */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.fade-in {
  animation: fadeIn 0.6s ease-out;
}

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

::-webkit-scrollbar-track {
  background: rgba(255, 255, 255, 0.1);
}

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

::-webkit-scrollbar-thumb:hover {
  background: var(--primary-red-hover);
}
button:focus,
button:focus-visible {
  outline: 4px auto -webkit-focus-ring-color;
}

@media (prefers-color-scheme: light) {
  :root {
    color: #213547;
    background-color: #ffffff;
  }
  a:hover {
    color: #747bff;
  }
  button {
    background-color: #f9f9f9;
  }
}