:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --secondary: #64748b;
    --success: #16a34a;
    --warning: #d97706;
    --danger: #dc2626;
    --review: #8b5cf6;
    --bg: #f8fafc;
    --surface: #ffffff;
    --text: #0f172a;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --sidebar-width: 260px;
    --radius: 6px;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);

    /* contextual backgrounds */
    --danger-bg: #fee2e2;
    --success-bg: #dcfce7;
    --warning-bg: #fff7ed;
    --info-bg: #dbeafe;
    --unread-bg: #eff6ff;
    --cancelled-bg: #cbd5e1;
}

body.dark-theme {
    --primary: #3b82f6;
    --primary-dark: #2563eb;
    --secondary: #94a3b8;
    --success: #22c55e;
    --warning: #f59e0b;
    --danger: #ef4444;
    --review: #a78bfa;
    --bg: #0f172a;
    --surface: #1e293b;
    --text: #f1f5f9;
    --text-muted: #94a3b8;
    --border: #334155;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.4);

    /* contextual backgrounds */
    --danger-bg: rgba(239, 68, 68, 0.15);
    --success-bg: rgba(34, 197, 94, 0.15);
    --warning-bg: rgba(245, 158, 11, 0.15);
    --info-bg: rgba(59, 130, 246, 0.15);
    --unread-bg: rgba(59, 130, 246, 0.12);
    --cancelled-bg: #475569;
}