:root {
  /* Light mode colors (white with dark gold) */
  --color-bg-primary: #ffffff;
  --color-bg-secondary: #f8f9fa;
  --color-bg-tertiary: #e9ecef;
  --color-text-primary: #1a1a1a;
  --color-text-secondary: #6c757d;
  --color-border: #dee2e6;
  --color-accent: #b8860b; /* Dark gold */
  --color-accent-hover: #8b6914;
  --color-accent-light: #daa520;
  --color-success: #28a745;
  --color-error: #dc3545;
  --color-warning: #ffc107;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.15);
  
  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  
  /* Border radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 350ms ease;
}

/* Dark mode (black with light gold) */
[data-theme="dark"] {
  --color-bg-primary: #0a0a0a;
  --color-bg-secondary: #1a1a1a;
  --color-bg-tertiary: #2a2a2a;
  --color-text-primary: #e9ecef;
  --color-text-secondary: #adb5bd;
  --color-border: #3a3a3a;
  --color-accent: #daa520; /* Light gold */
  --color-accent-hover: #ffd700;
  --color-accent-light: #f0e68c;
  --color-success: #4caf50;
  --color-error: #f44336;
  --color-warning: #ff9800;
}

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

html {
  font-size: 16px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
    'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
    sans-serif;
  line-height: 1.6;
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color var(--transition-base), color var(--transition-base);
}

#app {
  min-height: 100vh;
}

/* Typography */
h1 {
  font-size: 2.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-text-primary);
  margin-bottom: var(--space-lg);
}

h2 {
  font-size: 1.75rem;
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--space-md);
}

h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--space-sm);
}

p {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-md);
}

/* Buttons */
button, .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-lg);
  font-size: 1rem;
  font-weight: 500;
  font-family: inherit;
  color: var(--color-bg-primary);
  background-color: var(--color-accent);
  border: 2px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  white-space: nowrap;
}

button:hover:not(:disabled), .btn:hover:not(:disabled) {
  background-color: var(--color-accent-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

button:active:not(:disabled), .btn:active:not(:disabled) {
  transform: translateY(0);
}

button:disabled, .btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

button.btn-secondary {
  background-color: var(--color-bg-tertiary);
  color: var(--color-text-primary);
  border-color: var(--color-border);
}

button.btn-secondary:hover:not(:disabled) {
  background-color: var(--color-bg-secondary);
  border-color: var(--color-accent);
}

button.btn-outline {
  background-color: transparent;
  color: var(--color-accent);
  border-color: var(--color-accent);
}

button.btn-outline:hover:not(:disabled) {
  background-color: var(--color-accent);
  color: var(--color-bg-primary);
}

/* Inputs */
input[type="text"],
input[type="number"],
input[type="file"],
select {
  width: 100%;
  padding: var(--space-sm) var(--space-md);
  font-size: 1rem;
  font-family: inherit;
  color: var(--color-text-primary);
  background-color: var(--color-bg-secondary);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

input[type="text"]:focus,
input[type="number"]:focus,
input[type="file"]:focus,
select:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(218, 165, 32, 0.1);
}

input[type="range"] {
  width: 100%;
  height: 6px;
  -webkit-appearance: none;
  appearance: none;
  background: var(--color-bg-tertiary);
  border-radius: var(--radius-full);
  outline: none;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  background: var(--color-accent);
  border-radius: 50%;
  cursor: pointer;
  transition: all var(--transition-fast);
}

input[type="range"]::-webkit-slider-thumb:hover {
  background: var(--color-accent-hover);
  transform: scale(1.1);
}

input[type="range"]::-moz-range-thumb {
  width: 20px;
  height: 20px;
  background: var(--color-accent);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  transition: all var(--transition-fast);
}

input[type="range"]::-moz-range-thumb:hover {
  background: var(--color-accent-hover);
  transform: scale(1.1);
}

/* Cards */
.card {
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
}

.card:hover {
  box-shadow: var(--shadow-md);
}

/* Utility classes */
.container {
  width: 100%;
  max-width: 1400px;
  margin: 0 auto;
  padding: var(--space-xl);
}

.flex {
  display: flex;
}

.flex-col {
  flex-direction: column;
}

.items-center {
  align-items: center;
}

.justify-between {
  justify-content: space-between;
}

.gap-sm {
  gap: var(--space-sm);
}

.gap-md {
  gap: var(--space-md);
}

.gap-lg {
  gap: var(--space-lg);
}

.grid {
  display: grid;
}

.grid-cols-2 {
  grid-template-columns: repeat(2, 1fr);
}

.text-center {
  text-align: center;
}

.text-sm {
  font-size: 0.875rem;
}

.text-xs {
  font-size: 0.75rem;
}

.font-medium {
  font-weight: 500;
}

.font-semibold {
  font-weight: 600;
}

.mb-0 {
  margin-bottom: 0;
}

.mt-auto {
  margin-top: auto;
}

/* Scrollbar styling */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

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

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

::-webkit-scrollbar-thumb:hover {
  background: var(--color-accent);
}

/* Animations */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in {
  animation: fadeIn var(--transition-base) ease-out;
}

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

.spinner {
  animation: spin 1s linear infinite;
}

/* Responsive */
@media (max-width: 768px) {
  html {
    font-size: 14px;
  }

  .container {
    padding: var(--space-md);
  }

  h1 {
    font-size: 2rem;
  }

  .grid-cols-2 {
    grid-template-columns: 1fr;
  }
}