:root {
    /* Colors */
    --bg-primary: #0f1923;
    --bg-secondary: #1a2a35;
    --bg-tertiary: #243442;
    --text-primary: #e2e8f0;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --accent: #0f766e;
    --accent-light: #5eead4;
    --accent-hover: #14b8a6;
    --border-color: #2a3a4a;
    --border-hover: #3a4a5a;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    --h1-size: 3rem;
    --h2-size: 1.75rem;
    --h3-size: 1.25rem;
    --body-size: 1rem;
    --small-size: 0.875rem;
    --xs-size: 0.75rem;

    /* Spacing */
    --section-padding: 96px;
    --container-max: 900px;
    --card-padding: 24px;
    --card-radius: 12px;

    /* 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 24px rgba(0, 0, 0, 0.5);
    --shadow-hover: 0 12px 32px rgba(0, 0, 0, 0.6);

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

    /* Glow / Gradient */
    --glow-color: rgba(94, 234, 212, 0.25);
    --glow-color-strong: rgba(94, 234, 212, 0.45);
    --gradient-purple: rgba(139, 92, 246, 0.08);
    --gradient-teal: rgba(94, 234, 212, 0.08);

    /* Nav */
    --nav-height: 64px;
    --nav-bg: rgba(15, 25, 35, 0.85);
    --mobile-menu-bg: rgba(15, 25, 35, 0.97);

    /* Accent rgba (for backgrounds that use accent with alpha) */
    --accent-bg-subtle: rgba(15, 118, 110, 0.1);
    --accent-bg-light: rgba(15, 118, 110, 0.15);
    --accent-bg-medium: rgba(15, 118, 110, 0.2);
}

/* Light Mode */
:root.light-mode {
    /* Colors */
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-tertiary: #e9eef4;
    --text-primary: #0f172a;
    --text-secondary: #334155;
    --text-muted: #475569;
    --accent: #0f766e;
    --accent-light: #0f766e;
    --accent-hover: #0d9488;
    --border-color: #cbd5e1;
    --border-hover: #94a3b8;

    /* Shadows */
    --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 24px rgba(0, 0, 0, 0.12);
    --shadow-hover: 0 12px 32px rgba(0, 0, 0, 0.15);

    /* Glow / Gradient */
    --glow-color: rgba(15, 118, 110, 0.12);
    --glow-color-strong: rgba(15, 118, 110, 0.25);
    --gradient-purple: rgba(139, 92, 246, 0.04);
    --gradient-teal: rgba(15, 118, 110, 0.04);

    /* Nav */
    --nav-bg: rgba(248, 250, 252, 0.85);
    --mobile-menu-bg: rgba(248, 250, 252, 0.97);

    /* Accent rgba */
    --accent-bg-subtle: rgba(15, 118, 110, 0.06);
    --accent-bg-light: rgba(15, 118, 110, 0.1);
    --accent-bg-medium: rgba(15, 118, 110, 0.15);
}