/* === CSS Custom Properties & Variables - Reddit Style === */
:root {
  /* --- Reddit-inspired Color Palette --- */
  /* Light Theme Colors */
  --color-background-light: #dae0e6;
  --color-canvas-light: #ffffff;
  --color-post-bg-light: #ffffff;
  --color-surface-light: #ffffff;
  --color-surface-alt-light: #f8f9fa;
  --color-text-primary-light: #1a1a1b;
  --color-text-secondary-light: #7c7c83;
  --color-text-meta-light: #878a8c;
  --color-border-light: #ccc;
  --color-border-post-light: #e5e5e5;

  /* Dark Theme Colors */
  --color-background-dark: #030303;
  --color-canvas-dark: #1a1a1b;
  --color-post-bg-dark: #1a1a1b;
  --color-surface-dark: #1a1a1b;
  --color-surface-alt-dark: #272729;
  --color-text-primary-dark: #d7dadc;
  --color-text-secondary-dark: #9a9a9b;
  --color-text-meta-dark: #818384;
  --color-border-dark: #343536;
  --color-border-post-dark: #343536;

  /* Reddit Brand Colors */
  --color-reddit-orange: #ff4500;
  --color-reddit-blue: #0079d3;
  --color-vote-up: #ff4500;
  --color-vote-down: #7193ff;
  --color-accent: #0079d3;
  --color-accent-rgb: 0, 121, 211;

  /* Hover and Interaction States */
  --color-hover-overlay: rgba(255, 255, 255, 0.1);
  --color-hover-bg-light: #f6f7f8;
  --color-hover-bg-dark: #272729;
  --color-focus-ring: #0079d3;

  /* Dynamic color assignments */
  --color-bg-primary: var(--color-canvas-light);
  --color-bg-secondary: var(--color-surface-alt-light);
  --color-bg-tertiary: rgba(0, 0, 0, 0.05);
  --color-bg-post: var(--color-post-bg-light);
  --color-text-primary: var(--color-text-primary-light);
  --color-text-secondary: var(--color-text-secondary-light);
  --color-text-meta: var(--color-text-meta-light);
  --color-text-muted: rgba(0, 0, 0, 0.3);
  --color-border: var(--color-border-light);
  --color-border-post: var(--color-border-post-light);
  --color-border-muted: rgba(204, 204, 204, 0.5);
  --color-border-hover: rgba(0, 0, 0, 0.2);
  --color-bg-hover: var(--color-hover-bg-light);

  /* Error and validation colors */
  --color-error: #dc2626;
  --color-error-bg: #fef2f2;
  --color-success: #059669;
  --color-success-bg: #f0fdf4;
  --color-warning: #d97706;
  --color-warning-bg: #fffbeb;

  /* --- Typography --- */
  --font-primary: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-heading: var(--font-primary);
  --font-body: var(--font-primary);
  --font-meta: var(--font-primary);
  --font-monospace: "SF Mono", Monaco, "Cascadia Code", "Roboto Mono", Consolas, "Courier New", monospace;

  /* Font Sizes - Reddit Scale */
  --font-size-xs: 0.75rem;
  /* 12px */
  --font-size-sm: 0.875rem;
  /* 14px */
  --font-size-base: 1rem;
  /* 16px */
  --font-size-lg: 1.125rem;
  /* 18px */
  --font-size-xl: 1.25rem;
  /* 20px */
  --font-size-2xl: 1.5rem;
  /* 24px */
  --font-size-3xl: 1.875rem;
  /* 30px */

  /* Font Weights */
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  /* --- Spacing - Reddit Scale --- */
  --spacing-xs: 0.25rem;
  /* 4px */
  --spacing-sm: 0.5rem;
  /* 8px */
  --spacing-md: 0.75rem;
  /* 12px */
  --spacing-lg: 1rem;
  /* 16px */
  --spacing-xl: 1.25rem;
  /* 20px */
  --spacing-2xl: 1.5rem;
  /* 24px */
  --spacing-3xl: 2rem;
  /* 32px */
  --spacing-4xl: 2.5rem;
  /* 40px */

  /* --- Border Radius --- */
  --radius-sm: 2px;
  --radius-md: 4px;
  --radius-lg: 8px;
  --radius-xl: 12px;

  /* --- Shadows --- */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.12), 0 1px 2px rgba(0, 0, 0, 0.24);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
  --shadow-post: 0 2px 4px rgba(0, 0, 0, 0.1);

  /* --- Transitions --- */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.2s ease;
  --transition-slow: 0.3s ease;

  /* --- Z-Index Scale --- */
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-header: 500;
  --z-modal: 1000;
  --z-tooltip: 1100;

  /* --- Layout Dimensions --- */
  --header-height: 48px;
  --sidebar-width: 280px;
  --container-max-width: 2800px;
  --post-width: 1600px;
  --vote-width: 40px;

  /* --- Breakpoints --- */
  /* Note: Use these values in @media queries (variables not supported there):
     xs: 480px
     sm: 640px
     md: 768px
     lg: 1024px
     xl: 1280px
     2xl: 1440px
  */
  --breakpoint-xs: 480px;
  --breakpoint-sm: 640px;
  --breakpoint-md: 768px;
  --breakpoint-lg: 1024px;
  --breakpoint-xl: 1280px;
  --breakpoint-2xl: 1440px;

  /* === Universal.css Compatibility Aliases (Light Theme) === */
  --color-primary: #0079d3;
  --color-primary-hover: #1484d6;
  --color-primary-active: #005fa3;
  --color-secondary: #818384;
  /* --color-success defined above as #059669, universal uses #46d160. Keeping universal for compat or unifying? Unifying to universal's brighter green for reddit feel? using universal's value here */
  /* --color-warning defined above */
  /* --color-error defined above */
  --color-info: #0079d3;

  --bg-primary: #ffffff;
  --bg-secondary: #f7f9fa;
  --bg-tertiary: #edeff1;
  --bg-elevated: #ffffff;
  --bg-overlay: rgba(0, 0, 0, 0.8);

  --text-primary: #1c1c1c;
  --text-secondary: #7c7c7c;
  --text-muted: #818384;
  --text-inverse: #ffffff;

  --border-color: #edeff1;
  --border-hover: #d1d5db;
  --border-focus: #0079d3;

  /* Spacing Scale Aliases */
  --space-xs: var(--spacing-xs);
  --space-sm: var(--spacing-sm);
  --space-md: var(--spacing-lg);
  /* 1rem - universal md is 1rem, spacing-lg is 1rem */
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;

  /* Typography Aliases */
  /* universal sizes match somewhat but not exactly. mapping to closest or keeping distinct */
  --font-size-4xl: 2.25rem;

  /* Radius Aliases */
  --radius-2xl: 16px;

  /* Z-Index Aliases */
  --z-fixed: 1030;
  --z-modal-backdrop: 1040;
  --z-popover: 1060;

  /* === Main.css Compatibility Aliases === */
  --reddit-orange: #ff4500;
  --reddit-orange-light: #ff6b35;
  --reddit-orange-dark: #e03d00;
  --reddit-blue: #7193ff;
  --reddit-blue-light: #9bb1ff;
  --reddit-green: #46d160;
  --reddit-green-light: #6bdd7a;
  --reddit-gray: #1a1a1b;
  --reddit-gray-light: #272729;
  --reddit-gray-lighter: #343536;
  --reddit-gray-dark: #0f0f0f;
}

/* --- Dark mode overrides --- */
[data-theme="dark"] {
  /* Dark mode error colors */
  --color-error: #f87171;
  --color-error-bg: #1f1f1f;
  --color-success: #10b981;
  --color-success-bg: #1f1f1f;
  --color-warning: #f59e0b;
  --color-warning-bg: #1f1f1f;

  /* Dark mode UI colors */
  --color-bg-primary: var(--color-canvas-dark);
  --color-bg-secondary: var(--color-surface-alt-dark);
  --color-bg-tertiary: rgba(255, 255, 255, 0.05);
  --color-bg-post: var(--color-post-bg-dark);
  --color-text-primary: var(--color-text-primary-dark);
  --color-text-secondary: var(--color-text-secondary-dark);
  --color-text-meta: var(--color-text-meta-dark);
  --color-text-muted: rgba(215, 218, 220, 0.3);
  --color-border: var(--color-border-dark);
  --color-border-post: var(--color-border-post-dark);
  --color-border-muted: rgba(52, 53, 54, 0.5);
  --color-border-hover: rgba(255, 255, 255, 0.2);
  --color-bg-hover: var(--color-hover-bg-dark);

  /* Universal.css Compatibility - Dark Mode */
  --bg-primary: #030303;
  --bg-secondary: #1a1a1b;
  --bg-tertiary: #272729;
  --bg-elevated: #1a1a1b;
  --bg-overlay: rgba(0, 0, 0, 0.9);
  --text-primary: #d7dadc;
  --text-secondary: #818384;
  --text-muted: #818384;
  --border-color: #343536;
  --border-hover: #4a4a4b;
  /* Reddit Gray overrides from main.css */
  --reddit-gray: #1a1a1b;
  --reddit-gray-light: #272729;
  --reddit-gray-lighter: #343536;
  --reddit-gray-dark: #0f0f0f;
}

/* --- Accessibility & Motion Preferences --- */
@media (prefers-reduced-motion: reduce) {
  :root {
    --transition-fast: 0s;
    --transition-normal: 0s;
    --transition-slow: 0s;
  }
}

@media (prefers-contrast: high) {
  :root {
    --color-border-light: #000;
    --color-border-dark: #fff;
  }
}