:root {
    /* ── Backgrounds ── */
    --bg-body: #f8fafc;
    --bg-primary: #ffffff;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f1f5f9;
    --bg-hover: #e2e8f0;
    --bg-active: #dbeafe;

    /* ── Text ── */
    --text-primary: #111827;
    --text-secondary: #6b7280;
    --text-muted: #9ca3af;
    --text-inverse: #ffffff;

    /* ── Accent (Indigo) ── */
    --accent: #6366f1;
    --accent-hover: #4f46e5;
    --accent-glow: rgba(99, 102, 241, 0.15);
    --accent-subtle: rgba(99, 102, 241, 0.06);
    --accent-light: #eef2ff;

    /* ── Semantic ── */
    --success: #10b981;
    --success-bg: rgba(16, 185, 129, 0.1);
    --success-light: #ecfdf5;
    --warning: #f59e0b;
    --warning-bg: rgba(245, 158, 11, 0.1);
    --warning-light: #fffbeb;
    --danger: #ef4444;
    --danger-bg: rgba(239, 68, 68, 0.1);
    --danger-light: #fef2f2;
    --info: #3b82f6;
    --info-bg: rgba(59, 130, 246, 0.1);
    --info-light: #eff6ff;

    /* ── Borders ── */
    --border: #e5e7eb;
    --border-light: #f3f4f6;
    --border-focus: #6366f1;

    /* ── Radii ── */
    --radius-sm: 6px;
    --radius: 10px;
    --radius-lg: 14px;
    --radius-xl: 20px;
    --radius-full: 9999px;

    /* ── Shadows ── */
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.04);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -1px rgba(0,0,0,0.04);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -2px rgba(0,0,0,0.04);
    --shadow-glow: 0 0 20px var(--accent-glow);
    --shadow-hover: 0 16px 32px -8px rgba(0,0,0,0.12);

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

    /* ── Layout ── */
    --sidebar-width: 260px;
    --topbar-height: 64px;

    /* ── Sidebar (dark contrast) ── */
    --sidebar-bg: #0f172a;
    --sidebar-bg-hover: #1e293b;
    --sidebar-border: #1e293b;
    --sidebar-text: #94a3b8;
    --sidebar-text-hover: #e2e8f0;
    --sidebar-text-active: #ffffff;

    /* ── Transitions ── */
    --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}