/**
 * StucAdmin Design System v1.0
 * Centraal stylesheet voor consistente UI componenten
 */

/* ============================================
   1. CSS VARIABELEN (Custom Properties)
   ============================================ */
:root {
    /* Primary Colors */
    --color-primary-50: #f5f3ff;
    --color-primary-100: #ede9fe;
    --color-primary-200: #ddd6fe;
    --color-primary-300: #c4b5fd;
    --color-primary-400: #a78bfa;
    --color-primary-500: #8b5cf6;
    --color-primary-600: #7c3aed;
    --color-primary-700: #6d28d9;
    --color-primary-800: #5b21b6;
    --color-primary-900: #4c1d95;

    /* Secondary (Indigo) */
    --color-secondary-50: #eef2ff;
    --color-secondary-100: #e0e7ff;
    --color-secondary-200: #c7d2fe;
    --color-secondary-500: #6366f1;
    --color-secondary-600: #4f46e5;
    --color-secondary-700: #4338ca;

    /* Success (Green) */
    --color-success-50: #ecfdf5;
    --color-success-100: #d1fae5;
    --color-success-200: #a7f3d0;
    --color-success-500: #10b981;
    --color-success-600: #059669;
    --color-success-700: #047857;

    /* Danger (Red) */
    --color-danger-50: #fef2f2;
    --color-danger-100: #fee2e2;
    --color-danger-200: #fecaca;
    --color-danger-500: #ef4444;
    --color-danger-600: #dc2626;
    --color-danger-700: #b91c1c;

    /* Warning (Amber) */
    --color-warning-50: #fffbeb;
    --color-warning-100: #fef3c7;
    --color-warning-200: #fde68a;
    --color-warning-500: #f59e0b;
    --color-warning-600: #d97706;
    --color-warning-700: #b45309;

    /* Info (Blue) */
    --color-info-50: #eff6ff;
    --color-info-100: #dbeafe;
    --color-info-200: #bfdbfe;
    --color-info-500: #3b82f6;
    --color-info-600: #2563eb;
    --color-info-700: #1d4ed8;

    /* Orange (Accent) */
    --color-orange-50: #fff7ed;
    --color-orange-100: #ffedd5;
    --color-orange-500: #f97316;
    --color-orange-600: #ea580c;

    /* Neutral (Gray) */
    --color-gray-50: #f8fafc;
    --color-gray-100: #f1f5f9;
    --color-gray-200: #e5e7eb;
    --color-gray-300: #d1d5db;
    --color-gray-400: #9ca3af;
    --color-gray-500: #64748b;
    --color-gray-600: #475569;
    --color-gray-700: #374151;
    --color-gray-800: #1e293b;
    --color-gray-900: #0f172a;

    /* Semantic Colors */
    --color-background: #f5f7fa;
    --color-surface: #ffffff;
    --color-border: #e5e7eb;
    --color-border-light: #f1f5f9;
    --color-text-primary: #1e293b;
    --color-text-secondary: #64748b;
    --color-text-muted: #94a3b8;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.75rem;    /* 12px */
    --font-size-sm: 0.875rem;   /* 14px */
    --font-size-base: 1rem;     /* 16px */
    --font-size-lg: 1.125rem;   /* 18px */
    --font-size-xl: 1.25rem;    /* 20px */
    --font-size-2xl: 1.5rem;    /* 24px */
    --font-size-3xl: 1.875rem;  /* 30px */
    --font-size-4xl: 2.25rem;   /* 36px */

    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    --font-weight-extrabold: 800;

    --line-height-tight: 1.25;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;

    /* Spacing Scale */
    --space-0: 0;
    --space-1: 0.25rem;   /* 4px */
    --space-2: 0.5rem;    /* 8px */
    --space-3: 0.75rem;   /* 12px */
    --space-4: 1rem;      /* 16px */
    --space-5: 1.25rem;   /* 20px */
    --space-6: 1.5rem;    /* 24px */
    --space-8: 2rem;      /* 32px */
    --space-10: 2.5rem;   /* 40px */
    --space-12: 3rem;     /* 48px */

    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 10px;
    --radius-xl: 12px;
    --radius-2xl: 16px;
    --radius-3xl: 20px;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-xl: 0 8px 25px rgba(0, 0, 0, 0.1);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    --shadow-inner: inset 0 2px 4px rgba(0, 0, 0, 0.05);

    /* Focus Ring */
    --ring-primary: 0 0 0 3px rgba(139, 92, 246, 0.15);
    --ring-secondary: 0 0 0 3px rgba(99, 102, 241, 0.15);
    --ring-danger: 0 0 0 3px rgba(239, 68, 68, 0.15);
    --ring-success: 0 0 0 3px rgba(16, 185, 129, 0.15);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;

    /* Z-Index Scale */
    --z-dropdown: 50;
    --z-sticky: 80;
    --z-overlay: 90;
    --z-modal: 100;
    --z-popover: 110;
    --z-tooltip: 120;
    --z-toast: 130;
}

/* ============================================
   2. BASE RESETS & TYPOGRAPHY
   ============================================ */
*, *::before, *::after {
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

body.ds-body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: var(--line-height-normal);
    color: var(--color-text-primary);
    background: var(--color-background);
    margin: 0;
    padding: 0;
}

/* Typography Classes */
.ds-text-xs { font-size: var(--font-size-xs); }
.ds-text-sm { font-size: var(--font-size-sm); }
.ds-text-base { font-size: var(--font-size-base); }
.ds-text-lg { font-size: var(--font-size-lg); }
.ds-text-xl { font-size: var(--font-size-xl); }
.ds-text-2xl { font-size: var(--font-size-2xl); }
.ds-text-3xl { font-size: var(--font-size-3xl); }
.ds-text-4xl { font-size: var(--font-size-4xl); }

.ds-font-normal { font-weight: var(--font-weight-normal); }
.ds-font-medium { font-weight: var(--font-weight-medium); }
.ds-font-semibold { font-weight: var(--font-weight-semibold); }
.ds-font-bold { font-weight: var(--font-weight-bold); }
.ds-font-extrabold { font-weight: var(--font-weight-extrabold); }

.ds-text-primary { color: var(--color-text-primary); }
.ds-text-secondary { color: var(--color-text-secondary); }
.ds-text-muted { color: var(--color-text-muted); }

/* ============================================
   3. BUTTONS
   ============================================ */
.ds-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-5);
    font-family: var(--font-family);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    line-height: 1;
    text-decoration: none;
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-base);
    min-height: 44px;
    white-space: nowrap;
}

.ds-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Primary Button */
.ds-btn-primary {
    background: linear-gradient(135deg, var(--color-primary-500), var(--color-primary-600));
    color: white;
}

.ds-btn-primary:hover:not(:disabled) {
    background: linear-gradient(135deg, var(--color-primary-600), var(--color-primary-700));
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg);
}

/* Secondary Button */
.ds-btn-secondary {
    background: var(--color-gray-100);
    color: var(--color-gray-600);
    border: 1px solid var(--color-border);
}

.ds-btn-secondary:hover:not(:disabled) {
    background: var(--color-gray-200);
}

/* Danger Button */
.ds-btn-danger {
    background: var(--color-danger-100);
    color: var(--color-danger-600);
}

.ds-btn-danger:hover:not(:disabled) {
    background: var(--color-danger-200);
}

/* Danger Solid Button */
.ds-btn-danger-solid {
    background: linear-gradient(135deg, var(--color-danger-500), var(--color-danger-600));
    color: white;
}

.ds-btn-danger-solid:hover:not(:disabled) {
    background: linear-gradient(135deg, var(--color-danger-600), var(--color-danger-700));
}

/* Success Button */
.ds-btn-success {
    background: linear-gradient(135deg, var(--color-success-500), var(--color-success-600));
    color: white;
}

.ds-btn-success:hover:not(:disabled) {
    background: linear-gradient(135deg, var(--color-success-600), var(--color-success-700));
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg);
}

/* Warning Button */
.ds-btn-warning {
    background: linear-gradient(135deg, var(--color-warning-500), var(--color-warning-600));
    color: white;
}

.ds-btn-warning:hover:not(:disabled) {
    background: linear-gradient(135deg, var(--color-warning-600), var(--color-warning-700));
}

/* Ghost Button */
.ds-btn-ghost {
    background: transparent;
    color: var(--color-gray-600);
}

.ds-btn-ghost:hover:not(:disabled) {
    background: var(--color-gray-100);
}

/* Button Sizes */
.ds-btn-sm {
    padding: var(--space-2) var(--space-3);
    font-size: var(--font-size-xs);
    min-height: 36px;
}

.ds-btn-lg {
    padding: var(--space-4) var(--space-6);
    font-size: var(--font-size-base);
    min-height: 52px;
}

/* Icon Button */
.ds-btn-icon {
    width: 44px;
    padding: 0;
}

.ds-btn-icon.ds-btn-sm {
    width: 36px;
}

/* ============================================
   4. CARDS
   ============================================ */
.ds-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-2xl);
    overflow: hidden;
}

.ds-card-shadow {
    box-shadow: var(--shadow-md);
}

.ds-card-hover {
    transition: all var(--transition-base);
}

.ds-card-hover:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.ds-card-interactive {
    cursor: pointer;
    transition: all var(--transition-base);
}

.ds-card-interactive:hover {
    border-color: var(--color-primary-500);
    box-shadow: var(--shadow-lg);
}

.ds-card-header {
    padding: var(--space-4) var(--space-5);
    border-bottom: 1px solid var(--color-border-light);
    background: var(--color-gray-50);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.ds-card-body {
    padding: var(--space-5);
}

.ds-card-footer {
    padding: var(--space-4) var(--space-5);
    border-top: 1px solid var(--color-border-light);
    background: var(--color-gray-50);
}

/* Card with accent border */
.ds-card-accent-left {
    border-left: 4px solid var(--color-primary-500);
}

.ds-card-accent-success { border-left-color: var(--color-success-500); }
.ds-card-accent-danger { border-left-color: var(--color-danger-500); }
.ds-card-accent-warning { border-left-color: var(--color-warning-500); }
.ds-card-accent-info { border-left-color: var(--color-info-500); }

/* ============================================
   5. FORM INPUTS
   ============================================ */
.ds-form-label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-gray-700);
    margin-bottom: var(--space-2);
}

.ds-form-input {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    font-family: var(--font-family);
    font-size: var(--font-size-sm);
    color: var(--color-text-primary);
    background: var(--color-surface);
    border: 1px solid var(--color-gray-300);
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
    min-height: 44px;
}

.ds-form-input:focus {
    outline: none;
    border-color: var(--color-primary-500);
    box-shadow: var(--ring-primary);
}

.ds-form-input::placeholder {
    color: var(--color-gray-400);
}

.ds-form-input:disabled {
    background: var(--color-gray-100);
    cursor: not-allowed;
}

/* Input with error */
.ds-form-input-error {
    border-color: var(--color-danger-500);
}

.ds-form-input-error:focus {
    box-shadow: var(--ring-danger);
}

/* Select */
.ds-form-select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%2364748b' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10l-5 5z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right var(--space-4) center;
    padding-right: var(--space-10);
    cursor: pointer;
}

/* Textarea */
.ds-form-textarea {
    min-height: 100px;
    resize: vertical;
}

/* Checkbox & Radio wrapper */
.ds-form-check {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    cursor: pointer;
}

.ds-form-check input[type="checkbox"],
.ds-form-check input[type="radio"] {
    width: 18px;
    height: 18px;
    accent-color: var(--color-primary-500);
    cursor: pointer;
}

/* Form Group */
.ds-form-group {
    margin-bottom: var(--space-4);
}

/* Help text */
.ds-form-help {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    margin-top: var(--space-1);
}

.ds-form-error-text {
    font-size: var(--font-size-xs);
    color: var(--color-danger-600);
    margin-top: var(--space-1);
}

/* ============================================
   6. BADGES & PILLS
   ============================================ */
.ds-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    padding: var(--space-1) var(--space-3);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    border-radius: var(--radius-full);
    white-space: nowrap;
}

.ds-badge-primary {
    background: var(--color-primary-100);
    color: var(--color-primary-700);
}

.ds-badge-secondary {
    background: var(--color-gray-100);
    color: var(--color-gray-600);
}

.ds-badge-success {
    background: var(--color-success-100);
    color: var(--color-success-700);
}

.ds-badge-danger {
    background: var(--color-danger-100);
    color: var(--color-danger-700);
}

.ds-badge-warning {
    background: var(--color-warning-100);
    color: var(--color-warning-700);
}

.ds-badge-info {
    background: var(--color-info-100);
    color: var(--color-info-700);
}

/* Status dot */
.ds-status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    display: inline-block;
}

.ds-status-dot-success { background: var(--color-success-500); }
.ds-status-dot-danger { background: var(--color-danger-500); }
.ds-status-dot-warning { background: var(--color-warning-500); }
.ds-status-dot-info { background: var(--color-info-500); }
.ds-status-dot-muted { background: var(--color-gray-400); }

/* ============================================
   7. ALERTS
   ============================================ */
.ds-alert {
    padding: var(--space-4);
    border-radius: var(--radius-xl);
    display: flex;
    align-items: flex-start;
    gap: var(--space-3);
}

.ds-alert-icon {
    font-size: var(--font-size-xl);
    flex-shrink: 0;
}

.ds-alert-content {
    flex: 1;
}

.ds-alert-title {
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--space-1);
}

.ds-alert-message {
    font-size: var(--font-size-sm);
    opacity: 0.9;
}

.ds-alert-success {
    background: var(--color-success-50);
    border: 1px solid var(--color-success-200);
    color: var(--color-success-700);
}

.ds-alert-danger {
    background: var(--color-danger-50);
    border: 1px solid var(--color-danger-200);
    color: var(--color-danger-700);
}

.ds-alert-warning {
    background: var(--color-warning-50);
    border: 1px solid var(--color-warning-200);
    color: var(--color-warning-700);
}

.ds-alert-info {
    background: var(--color-info-50);
    border: 1px solid var(--color-info-200);
    color: var(--color-info-700);
}

/* ============================================
   8. TABLES
   ============================================ */
.ds-table {
    width: 100%;
    border-collapse: collapse;
}

.ds-table th {
    text-align: left;
    padding: var(--space-3) var(--space-4);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-muted);
    background: var(--color-gray-50);
    border-bottom: 2px solid var(--color-border);
}

.ds-table td {
    padding: var(--space-3) var(--space-4);
    border-bottom: 1px solid var(--color-border-light);
    vertical-align: middle;
}

.ds-table tbody tr {
    transition: background var(--transition-fast);
}

.ds-table tbody tr:hover {
    background: var(--color-gray-50);
}

.ds-table-clickable tbody tr {
    cursor: pointer;
}

/* ============================================
   9. MODALS
   ============================================ */
.ds-modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: var(--z-modal);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-4);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
}

.ds-modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.ds-modal {
    background: var(--color-surface);
    border-radius: var(--radius-2xl);
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transform: scale(0.95) translateY(10px);
    transition: transform var(--transition-base);
}

.ds-modal-overlay.active .ds-modal {
    transform: scale(1) translateY(0);
}

.ds-modal-lg { max-width: 700px; }
.ds-modal-xl { max-width: 900px; }

.ds-modal-header {
    padding: var(--space-5);
    border-bottom: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.ds-modal-title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    margin: 0;
}

.ds-modal-close {
    background: none;
    border: none;
    font-size: var(--font-size-xl);
    color: var(--color-gray-400);
    cursor: pointer;
    padding: var(--space-2);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.ds-modal-close:hover {
    background: var(--color-gray-100);
    color: var(--color-gray-600);
}

.ds-modal-body {
    padding: var(--space-5);
    overflow-y: auto;
    flex: 1;
}

.ds-modal-footer {
    padding: var(--space-4) var(--space-5);
    border-top: 1px solid var(--color-border);
    display: flex;
    justify-content: flex-end;
    gap: var(--space-3);
}

/* ============================================
   10. TABS
   ============================================ */
.ds-tabs {
    display: flex;
    gap: var(--space-2);
    border-bottom: 1px solid var(--color-border);
    padding-bottom: 0;
    overflow-x: auto;
}

.ds-tab {
    padding: var(--space-3) var(--space-5);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-secondary);
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
    margin-bottom: -1px;
}

.ds-tab:hover {
    color: var(--color-text-primary);
}

.ds-tab.active {
    color: var(--color-primary-600);
    border-bottom-color: var(--color-primary-600);
}

/* Pill tabs variant */
.ds-tabs-pills {
    border-bottom: none;
    background: var(--color-gray-100);
    padding: var(--space-1);
    border-radius: var(--radius-lg);
    width: fit-content;
}

.ds-tabs-pills .ds-tab {
    border-bottom: none;
    border-radius: var(--radius-md);
    margin-bottom: 0;
}

.ds-tabs-pills .ds-tab.active {
    background: var(--color-surface);
    box-shadow: var(--shadow-sm);
    color: var(--color-text-primary);
}

/* ============================================
   11. AVATARS
   ============================================ */
.ds-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: var(--font-weight-semibold);
    font-size: var(--font-size-sm);
    color: white;
    background: linear-gradient(135deg, var(--color-primary-500), var(--color-primary-600));
    flex-shrink: 0;
}

.ds-avatar-sm { width: 32px; height: 32px; font-size: var(--font-size-xs); }
.ds-avatar-lg { width: 56px; height: 56px; font-size: var(--font-size-lg); }
.ds-avatar-xl { width: 80px; height: 80px; font-size: var(--font-size-2xl); }

.ds-avatar-secondary { background: linear-gradient(135deg, var(--color-secondary-500), var(--color-secondary-600)); }
.ds-avatar-success { background: linear-gradient(135deg, var(--color-success-500), var(--color-success-600)); }
.ds-avatar-warning { background: linear-gradient(135deg, var(--color-warning-500), var(--color-warning-600)); }
.ds-avatar-danger { background: linear-gradient(135deg, var(--color-danger-500), var(--color-danger-600)); }

/* ============================================
   12. TOAST NOTIFICATIONS
   ============================================ */
.ds-toast-container {
    position: fixed;
    bottom: var(--space-6);
    right: var(--space-6);
    z-index: var(--z-toast);
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.ds-toast {
    padding: var(--space-4) var(--space-5);
    border-radius: var(--radius-xl);
    font-weight: var(--font-weight-medium);
    color: white;
    box-shadow: var(--shadow-xl);
    animation: ds-slideIn 0.3s ease;
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

@keyframes ds-slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

.ds-toast-success { background: var(--color-success-500); }
.ds-toast-danger { background: var(--color-danger-500); }
.ds-toast-warning { background: var(--color-warning-500); }
.ds-toast-info { background: var(--color-info-500); }

/* ============================================
   13. LOADING STATES
   ============================================ */
.ds-spinner {
    width: 24px;
    height: 24px;
    border: 3px solid var(--color-gray-200);
    border-top-color: var(--color-primary-500);
    border-radius: 50%;
    animation: ds-spin 0.8s linear infinite;
}

@keyframes ds-spin {
    to { transform: rotate(360deg); }
}

.ds-spinner-sm { width: 16px; height: 16px; border-width: 2px; }
.ds-spinner-lg { width: 32px; height: 32px; border-width: 4px; }

.ds-skeleton {
    background: linear-gradient(90deg, var(--color-gray-200) 25%, var(--color-gray-100) 50%, var(--color-gray-200) 75%);
    background-size: 200% 100%;
    animation: ds-shimmer 1.5s infinite;
    border-radius: var(--radius-md);
}

@keyframes ds-shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* ============================================
   14. UTILITY CLASSES
   ============================================ */
/* Spacing */
.ds-m-0 { margin: var(--space-0); }
.ds-m-1 { margin: var(--space-1); }
.ds-m-2 { margin: var(--space-2); }
.ds-m-3 { margin: var(--space-3); }
.ds-m-4 { margin: var(--space-4); }
.ds-m-5 { margin: var(--space-5); }
.ds-m-6 { margin: var(--space-6); }

.ds-mb-0 { margin-bottom: var(--space-0); }
.ds-mb-1 { margin-bottom: var(--space-1); }
.ds-mb-2 { margin-bottom: var(--space-2); }
.ds-mb-3 { margin-bottom: var(--space-3); }
.ds-mb-4 { margin-bottom: var(--space-4); }
.ds-mb-5 { margin-bottom: var(--space-5); }
.ds-mb-6 { margin-bottom: var(--space-6); }

.ds-mt-0 { margin-top: var(--space-0); }
.ds-mt-1 { margin-top: var(--space-1); }
.ds-mt-2 { margin-top: var(--space-2); }
.ds-mt-3 { margin-top: var(--space-3); }
.ds-mt-4 { margin-top: var(--space-4); }

.ds-p-0 { padding: var(--space-0); }
.ds-p-1 { padding: var(--space-1); }
.ds-p-2 { padding: var(--space-2); }
.ds-p-3 { padding: var(--space-3); }
.ds-p-4 { padding: var(--space-4); }
.ds-p-5 { padding: var(--space-5); }
.ds-p-6 { padding: var(--space-6); }

/* Flex */
.ds-flex { display: flex; }
.ds-flex-col { flex-direction: column; }
.ds-flex-wrap { flex-wrap: wrap; }
.ds-items-center { align-items: center; }
.ds-items-start { align-items: flex-start; }
.ds-justify-center { justify-content: center; }
.ds-justify-between { justify-content: space-between; }
.ds-justify-end { justify-content: flex-end; }
.ds-gap-1 { gap: var(--space-1); }
.ds-gap-2 { gap: var(--space-2); }
.ds-gap-3 { gap: var(--space-3); }
.ds-gap-4 { gap: var(--space-4); }
.ds-gap-5 { gap: var(--space-5); }

/* Grid */
.ds-grid { display: grid; }
.ds-grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
.ds-grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
.ds-grid-cols-4 { grid-template-columns: repeat(4, 1fr); }

/* Text align */
.ds-text-left { text-align: left; }
.ds-text-center { text-align: center; }
.ds-text-right { text-align: right; }

/* Display */
.ds-hidden { display: none; }
.ds-block { display: block; }
.ds-inline { display: inline; }
.ds-inline-block { display: inline-block; }

/* Width */
.ds-w-full { width: 100%; }
.ds-w-auto { width: auto; }

/* Overflow */
.ds-overflow-hidden { overflow: hidden; }
.ds-overflow-auto { overflow: auto; }

/* Cursor */
.ds-cursor-pointer { cursor: pointer; }

/* Truncate */
.ds-truncate {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* ============================================
   15. RESPONSIVE HELPERS
   ============================================ */
@media (max-width: 768px) {
    :root {
        --space-4: 0.875rem;
        --space-5: 1rem;
        --space-6: 1.25rem;
    }

    .ds-hide-mobile { display: none !important; }
    .ds-show-mobile { display: block !important; }

    .ds-grid-cols-2,
    .ds-grid-cols-3,
    .ds-grid-cols-4 {
        grid-template-columns: 1fr;
    }

    .ds-modal {
        max-width: 100%;
        max-height: 100%;
        border-radius: var(--radius-xl) var(--radius-xl) 0 0;
    }

    .ds-table {
        font-size: var(--font-size-xs);
    }
}

@media (min-width: 769px) {
    .ds-hide-desktop { display: none !important; }
    .ds-show-desktop { display: block !important; }
}

/* ============================================
   17. UNIVERSAL STAT CARDS (KPI Cards)
   ============================================ */

.kpi-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin-bottom: 24px;
}

.kpi-card {
    position: relative;
    overflow: hidden;
    background: white;
    border-radius: 12px;
    padding: 16px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.08);
    border: 1px solid var(--color-border, #e5e7eb);
}

.kpi-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--accent, #6366f1);
}

.kpi-label {
    font-size: 12px;
    color: var(--color-gray-500, #64748b);
    margin-bottom: 6px;
}

.kpi-value {
    font-size: 28px;
    font-weight: 700;
    color: var(--accent, var(--color-gray-800, #1e293b));
}

.kpi-value.green { color: #10b981; }
.kpi-value.blue { color: #3b82f6; }
.kpi-value.orange { color: #f59e0b; }
.kpi-value.red { color: #ef4444; }
.kpi-value.purple { color: #8b5cf6; }

/* Responsive: 2 columns on tablet, 1 on mobile */
@media (max-width: 1024px) {
    .kpi-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 640px) {
    .kpi-grid {
        grid-template-columns: 1fr;
    }
    .kpi-card {
        padding: 12px;
    }
    .kpi-value {
        font-size: 22px;
    }
}