:root {
    /* --- Premium Dark Palette (Zinc/Slate) --- */
    --bg-primary: #09090b;      /* Zinc 950 */
    --bg-secondary: #0f172a;    /* Slate 900 - Sidebar/Header */
    --bg-tertiary: #1e293b;     /* Slate 800 - Cards/Backgrounds */
    --bg-glass: rgba(15, 23, 42, 0.7);
    
    --text-primary: #f8fafc;    /* Slate 50 */
    --text-secondary: #94a3b8;  /* Slate 400 */
    --text-muted: #64748b;      /* Slate 500 */
    
    /* --- Accents & Indicators --- */
    --accent: #6366f1;          /* Indigo 500 */
    --accent-hover: #4f46e5;    /* Indigo 600 */
    --accent-glow: rgba(99, 102, 241, 0.15);
    
    --success: #10b981;         /* Emerald 500 */
    --warning: #f59e0b;         /* Amber 500 */
    --danger: #ef4444;          /* Red 500 */
    
    /* --- Structure & Borders --- */
    --border: rgba(148, 163, 184, 0.1);
    --border-strong: rgba(148, 163, 184, 0.2);
    
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 16px;          /* "Bento" card radius */
    
    --shadow-soft: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.1);
    
    /* --- Layout Vars --- */
    --sidebar-width: 260px;
    --sidebar-width-collapsed: 0px;
    --header-height: 72px;
    --spacing-app: 2rem;
    --spacing-card: 1.5rem;
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* --- Base Resets --- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-font-smoothing: antialiased;
}

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    line-height: 1.5;
    overflow-x: hidden;
}

/* Glassmorphism Utility */
.glass {
    background: var(--bg-glass);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border);
}

/* Bento Box Shadow */
.bento-shadow {
    box-shadow: var(--shadow-soft), var(--shadow-glow);
}