/**
 * VIETBLOG DESIGN TOKENS
 * Single Source of Truth for Light, Dark, and Sepia Themes
 */

:root, [data-theme="light"] {
  --bg: #FAFAF7;
  --surface: #FFFFFF;
  --surface-2: #F1F0EA;
  --text: #1F2328;
  --text-muted: #57606A;
  --border: #E1DFD7;
  --accent: #B4442C;
  --accent-hover: #963520;
  --accent-contrast: #FFFFFF;
  --success: #1A7F37;
  --warning: #9A6700;
  --danger: #CF222E;
  --info: #0969DA;
  --overlay: rgba(15, 23, 42, 0.4);
  --focus-ring: rgba(180, 68, 44, 0.35);
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
}

html.dark, [data-theme="dark"] {
  --bg: #0E1117;
  --surface: #161B22;
  --surface-2: #21262D;
  --text: #E6EDF3;
  --text-muted: #8B949E;
  --border: #30363D;
  --accent: #E27D60;
  --accent-hover: #EE967D;
  --accent-contrast: #161B22;
  --success: #3FB950;
  --warning: #D29922;
  --danger: #F85149;
  --info: #58A6FF;
  --overlay: rgba(0, 0, 0, 0.75);
  --focus-ring: rgba(226, 125, 96, 0.45);
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.6);
}

html.sepia, [data-theme="sepia"] {
  --bg: #F4ECD8;
  --surface: #FBF5E6;
  --surface-2: #EDE1C7;
  --text: #3B3226;
  --text-muted: #6B5F4B;
  --border: #DECFAF;
  --accent: #9A4A2B;
  --accent-hover: #813C22;
  --accent-contrast: #FFFFFF;
  --success: #2E6A38;
  --warning: #855700;
  --danger: #B52B27;
  --info: #1B589A;
  --overlay: rgba(59, 50, 38, 0.4);
  --focus-ring: rgba(154, 74, 43, 0.35);
  --shadow-sm: 0 1px 2px 0 rgba(59, 50, 38, 0.08);
  --shadow-md: 0 4px 6px -1px rgba(59, 50, 38, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(59, 50, 38, 0.12);
}

:root {
  --font-sans: "Plus Jakarta Sans", system-ui, -apple-system, sans-serif;
  --font-serif: "Merriweather", "Lora", Georgia, serif;
  --font-display: "Playfair Display", Georgia, serif;

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-12: 3rem;

  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;

  --dur-fast: 120ms;
  --dur-base: 200ms;
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
}

body {
  background-color: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  transition: background-color var(--dur-base) var(--ease), color var(--dur-base) var(--ease);
}

.theme-surface {
  background-color: var(--surface);
  border-color: var(--border);
}

.theme-surface-2 {
  background-color: var(--surface-2);
}

.theme-border {
  border-color: var(--border);
}

.theme-text {
  color: var(--text);
}

.theme-text-muted {
  color: var(--text-muted);
}

.theme-accent {
  color: var(--accent);
}

.theme-bg-accent {
  background-color: var(--accent);
  color: var(--accent-contrast);
}

.theme-bg-accent:hover {
  background-color: var(--accent-hover);
}

/* Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
  *, ::before, ::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}