/* ==========================================
   CSS VARIABLES - Color Schemes & Themes
   ========================================== */

:root {
    /* Light Mode Colors */
    --bg-primary: #FAFAFA;
    --bg-secondary: #FFFFFF;
    --bg-tertiary: #F5F5F5;

    --text-primary: #1A1A1A;
    --text-secondary: #666666;
    --text-tertiary: #999999;

    --accent-primary: #2563EB;
    --accent-hover: #1D4ED8;
    --accent-light: #DBEAFE;

    --border-color: #E5E5E5;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 20px rgba(0, 0, 0, 0.12);
    --shadow-hover: 0 8px 16px rgba(0, 0, 0, 0.15);

    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    --font-mono: 'Courier New', monospace;

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

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

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;

    /* Layout */
    --container-width: 1200px;
    --content-width: 720px;
    --header-height: 70px;
}

/* Dark Mode */
[data-theme="dark"] {
    --bg-primary: #0A0A0A;
    --bg-secondary: #1A1A1A;
    --bg-tertiary: #2A2A2A;

    --text-primary: #E8E8E8;
    --text-secondary: #A0A0A0;
    --text-tertiary: #707070;

    --accent-primary: #60A5FA;
    --accent-hover: #93C5FD;
    --accent-light: #1E3A5F;

    --border-color: #2A2A2A;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 20px rgba(0, 0, 0, 0.5);
    --shadow-hover: 0 8px 16px rgba(0, 0, 0, 0.6);
}

/* Smooth theme transition */
* {
    transition: background-color var(--transition-base),
                color var(--transition-base),
                border-color var(--transition-base);
}

/* Gradient for accent text */
.gradient-text {
    background: linear-gradient(135deg, var(--accent-primary), #8B5CF6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}