:root {
    /* ========================================
       PHONOS DESIGN SYSTEM v5 - UNIFIED DARK
       Deep Space Theme with Emerald Green
       ======================================== */

    /* Background Colors - Deep Space */
    --bg-body: #293742;
    --bg-surface: #30404D;
    --bg-card: #30404D;
    --bg-card-hover: #394B59;
    --bg-elevated: #394B59;
    --bg-hover: #3D4F5D;
    --bg-active: #465968;

    /* Border Colors */
    --border-color: rgba(255, 255, 255, 0.15);
    --border-color-light: rgba(255, 255, 255, 0.25);
    --border-color-focus: rgba(16, 185, 129, 0.7);

    /* Text Colors */
    --text-primary: #F5F8FA;
    --text-secondary: #C7D0DB;
    --text-tertiary: #AFBDCC;
    --text-muted: #A3B3C5;

    /* Primary Accent - Emerald Green */
    --accent-primary: #0F9960;
    --accent-primary-light: #34d399;
    --accent-primary-dark: #0A6B43;
    --accent-primary-glow: rgba(16, 185, 129, 0.5);
    --accent-primary-muted: rgba(16, 185, 129, 0.15);
    --accent-primary-10: rgba(16, 185, 129, 0.1);
    --accent-primary-20: rgba(16, 185, 129, 0.2);
    --accent-primary-30: rgba(16, 185, 129, 0.3);

    /* Secondary Accent - Purple */
    --accent-secondary: #8b5cf6;
    --accent-secondary-light: #a78bfa;
    --accent-secondary-dark: #7c3aed;
    --accent-secondary-glow: rgba(139, 92, 246, 0.4);
    --accent-secondary-muted: rgba(139, 92, 246, 0.15);

    /* Tertiary Accent - Cyan (IoT, Visualizer) */
    --accent-cyan: #06b6d4;
    --accent-cyan-light: #22d3ee;
    --accent-cyan-dark: #0891b2;
    --accent-cyan-glow: rgba(6, 182, 212, 0.4);
    --accent-cyan-muted: rgba(6, 182, 212, 0.15);
    --accent-cyan-10: rgba(6, 182, 212, 0.1);
    --accent-cyan-20: rgba(6, 182, 212, 0.2);

    /* Quaternary Accent - Orange (Notebook) */
    --accent-orange: #f97316;
    --accent-orange-light: #fb923c;
    --accent-orange-dark: #ea580c;
    --accent-orange-glow: rgba(249, 115, 22, 0.4);
    --accent-orange-muted: rgba(249, 115, 22, 0.15);

    /* Status Colors */
    --accent-success: #0F9960;
    --accent-success-light: #34d399;
    --accent-success-glow: rgba(16, 185, 129, 0.4);
    --accent-success-dark: #0A6B43;
    --accent-success-muted: rgba(16, 185, 129, 0.15);

    --accent-warning: #D9822B;
    --accent-warning-light: #fbbf24;
    --accent-warning-glow: rgba(245, 158, 11, 0.4);
    --accent-warning-muted: rgba(245, 158, 11, 0.15);

    --accent-danger: #DB3737;
    --accent-danger-light: #f87171;
    --accent-danger-glow: rgba(239, 68, 68, 0.4);
    --accent-danger-muted: rgba(239, 68, 68, 0.15);

    --accent-info: #06b6d4;
    --accent-info-light: #22d3ee;
    --accent-info-glow: rgba(6, 182, 212, 0.4);
    --accent-info-muted: rgba(6, 182, 212, 0.15);

    /* Nav Icon Colors - Muted palette for sidebar */
    --nav-dashboard: #6b73c7;
    --nav-projects: #8b7bc7;
    --nav-files: #3ba8b8;
    --nav-jobs: #c9a030;
    --nav-usage: #2d9d78;
    --nav-submit: #c75a5a;
    --nav-viewer: #c06898;
    --nav-teams: #36a89a;
    --nav-settings: #7c7f87;
    --nav-admin: #c97a3a;
    --nav-preview: #8c52c9;
    --nav-visualizer: #22b8cf;
    --nav-search: #9478d8;
    --nav-databases: #2da87a;
    --nav-iot: #22b8cf;
    --nav-logout: #b85858;

    /* Nav Active Backgrounds - Gradient start colors */
    --nav-active-dashboard: #5558c7;
    --nav-active-projects: #7352c7;
    --nav-active-files: #0897a8;
    --nav-active-jobs: #b8940e;
    --nav-active-usage: #0d8a60;
    --nav-active-submit: #c24848;
    --nav-active-viewer: #b8488a;
    --nav-active-teams: #0d8f80;
    --nav-active-settings: #5a5d65;
    --nav-active-admin: #c06a20;
    --nav-active-preview: #8040c0;
    --nav-active-visualizer: #088fa8;
    --nav-active-search: #7352c7;
    --nav-active-databases: #0d8a60;
    --nav-active-iot: #088fa8;

    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.5);
    --shadow-md: 0 6px 16px rgba(0, 0, 0, 0.6);
    --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.75);
    --shadow-xl: 0 24px 64px rgba(0, 0, 0, 0.85);
    --shadow-glow: 0 0 30px rgba(16, 185, 129, 0.3);
    --shadow-glow-success: 0 0 30px rgba(16, 185, 129, 0.3);
    --shadow-glow-warning: 0 0 30px rgba(245, 158, 11, 0.3);
    --shadow-glow-danger: 0 0 30px rgba(239, 68, 68, 0.3);
    --shadow-glow-info: 0 0 30px rgba(6, 182, 212, 0.3);

    /* Border Radius */
    --radius-xs: 2px;
    --radius-sm: 3px;
    --radius-md: 4px;
    --radius-lg: 6px;
    --radius-xl: 8px;
    --radius-2xl: 10px;
    --radius-full: 9999px;

    /* Spacing Scale */
    --space-0: 0;
    --space-1: 0.125rem;
    --space-2: 0.25rem;
    --space-3: 0.5rem;
    --space-4: 0.75rem;
    --space-5: 1rem;
    --space-6: 1.25rem;
    --space-8: 1.5rem;
    --space-10: 2rem;
    --space-12: 2.5rem;
    --space-16: 3rem;

    /* Z-Index Scale */
    --z-base: 1;
    --z-dropdown: 10;
    --z-sticky: 20;
    --z-header: 40;
    --z-sidebar: 50;
    --z-overlay: 100;
    --z-modal: 200;
    --z-toast: 300;
    --z-tooltip: 400;

    /* Layout */
    --header-height: 52px;
    --sidebar-width: 260px;

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

    /* Font Family */
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;

    /* Transitions */
    --ease-out: cubic-bezier(0.33, 1, 0.68, 1);
    --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
    --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;

    /* Typography Scale */
    --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;
}