:root {
    /* Dark theme (default) */
    --color-bg: #0a0a0a;
    --color-bg-elevated: #141414;
    --color-bg-card: #1a1a1a;
    --color-bg-card-hover: #222;
    --color-bg-input: #1a1a1a;
    --color-border: #2a2a2a;
    --color-border-hover: #3a3a3a;
    --color-text: #e8e8e8;
    --color-text-secondary: #888;
    --color-text-muted: #555;
    --color-accent: #ff6b35;
    --color-accent-hover: #ff8555;
    --color-accent-subtle: rgba(255, 107, 53, 0.12);
    --color-success: #34d399;
    --color-warning: #fbbf24;
    --color-error: #f87171;
    --color-overlay: rgba(0, 0, 0, 0.7);

    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 2rem;
    --text-4xl: 2.5rem;
    --text-5xl: 3.5rem;

    --leading-tight: 1.2;
    --leading-normal: 1.5;
    --leading-relaxed: 1.7;

    --weight-normal: 400;
    --weight-medium: 500;
    --weight-semibold: 600;
    --weight-bold: 700;

    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    --space-4xl: 6rem;

    /* Layout */
    --container-max: 1400px;
    --container-narrow: 900px;
    --sidebar-width: 280px;
    --header-height: 64px;
    --card-radius: 12px;
    --radius-sm: 6px;
    --radius-full: 9999px;

    /* Grid */
    --grid-gap: 16px;
    --grid-cols-mobile: 2;
    --grid-cols-tablet: 3;
    --grid-cols-desktop: 4;

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 20px rgba(255, 107, 53, 0.15);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms ease;

    /* Z-index */
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-header: 300;
    --z-overlay: 400;
    --z-modal: 500;
}

[data-theme="light"] {
    --color-bg: #f5f5f5;
    --color-bg-elevated: #fff;
    --color-bg-card: #fff;
    --color-bg-card-hover: #fafafa;
    --color-bg-input: #fff;
    --color-border: #e0e0e0;
    --color-border-hover: #ccc;
    --color-text: #1a1a1a;
    --color-text-secondary: #666;
    --color-text-muted: #999;
    --color-accent: #e55a2b;
    --color-accent-hover: #d14a1b;
    --color-accent-subtle: rgba(229, 90, 43, 0.08);
    --color-overlay: rgba(0, 0, 0, 0.5);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.12);
    --shadow-glow: 0 0 20px rgba(229, 90, 43, 0.1);
}