/**
 * Event Manager Pro - Design System
 * Path: public_html/assets/css/design-system.css
 *
 * Complete design token system + reusable component library
 * Mobile-first, dark mode ready, performance optimized
 *
 * @version 2.0.0
 */

/* ============================================================
   DESIGN TOKENS
   ============================================================ */
:root {
    /* --- Neutrals (warm stone) --- */
    --gray-50: #fafaf9;
    --gray-100: #f5f5f4;
    --gray-200: #e7e5e4;
    --gray-300: #d6d3d1;
    --gray-400: #a8a29e;
    --gray-500: #78716c;
    --gray-600: #57534e;
    --gray-700: #44403c;
    --gray-800: #292524;
    --gray-900: #1c1917;
    --gray-950: #0c0a09;

    /* --- Accent (Cyan/Teal) --- */
    --accent-50: #ecfeff;
    --accent-100: #cffafe;
    --accent-200: #a5f3fc;
    --accent-300: #67e8f9;
    --accent-400: #22d3ee;
    --accent-500: #06b6d4;
    --accent-600: #0891b2;
    --accent-700: #0e7490;
    --accent-800: #155e75;
    --accent-900: #164e63;

    /* --- Semantic --- */
    --success-50: #f0fdf4;
    --success-100: #dcfce7;
    --success-500: #22c55e;
    --success-600: #16a34a;
    --success-700: #15803d;

    --warning-50: #fffbeb;
    --warning-100: #fef3c7;
    --warning-500: #f59e0b;
    --warning-600: #d97706;
    --warning-700: #b45309;

    --danger-50: #fef2f2;
    --danger-100: #fee2e2;
    --danger-500: #ef4444;
    --danger-600: #dc2626;
    --danger-700: #b91c1c;

    --info-50: #eff6ff;
    --info-100: #dbeafe;
    --info-500: #3b82f6;
    --info-600: #2563eb;

    /* --- Surfaces --- */
    --surface-primary: var(--gray-50);
    --surface-secondary: #ffffff;
    --surface-elevated: #ffffff;
    --surface-inset: var(--gray-100);
    --surface-overlay: rgba(0, 0, 0, 0.6);

    /* --- Text --- */
    --text-primary: var(--gray-900);
    --text-secondary: var(--gray-600);
    --text-tertiary: var(--gray-400);
    --text-inverse: #ffffff;
    --text-accent: var(--accent-600);
    --text-link: var(--accent-700);

    /* --- Borders --- */
    --border-default: var(--gray-200);
    --border-subtle: var(--gray-100);
    --border-strong: var(--gray-300);
    --border-accent: var(--accent-500);

    /* --- Spacing (8px base) --- */
    --space-0: 0;
    --space-px: 1px;
    --space-0-5: 0.125rem;
    --space-1: 0.25rem;
    --space-1-5: 0.375rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    --space-24: 6rem;

    /* --- Border Radius --- */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-2xl: 32px;
    --radius-full: 9999px;

    /* --- Shadows --- */
    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.15);
    --shadow-inner: inset 0 2px 4px rgba(0, 0, 0, 0.05);
    --shadow-accent: 0 4px 14px rgba(6, 182, 212, 0.25);
    --shadow-accent-lg: 0 8px 24px rgba(6, 182, 212, 0.3);

    /* --- Typography --- */
    --font-sans: 'Inter', 'SF Pro Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'SF Mono', 'Fira Code', ui-monospace, monospace;

    --text-xs: clamp(0.7rem, 0.65rem + 0.25vw, 0.75rem);
    --text-sm: clamp(0.8rem, 0.75rem + 0.25vw, 0.875rem);
    --text-base: clamp(0.9rem, 0.85rem + 0.25vw, 1rem);
    --text-lg: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
    --text-xl: clamp(1.15rem, 1.05rem + 0.5vw, 1.25rem);
    --text-2xl: clamp(1.35rem, 1.15rem + 1vw, 1.5rem);
    --text-3xl: clamp(1.6rem, 1.3rem + 1.5vw, 1.875rem);
    --text-4xl: clamp(2rem, 1.5rem + 2.5vw, 2.25rem);
    --text-5xl: clamp(2.5rem, 1.8rem + 3.5vw, 3rem);

    --leading-none: 1;
    --leading-tight: 1.25;
    --leading-snug: 1.375;
    --leading-normal: 1.5;
    --leading-relaxed: 1.625;

    --tracking-tight: -0.025em;
    --tracking-normal: 0;
    --tracking-wide: 0.025em;
    --tracking-wider: 0.05em;
    --tracking-widest: 0.1em;

    /* --- Transitions --- */
    --ease-default: cubic-bezier(0.4, 0, 0.2, 1);
    --ease-in: cubic-bezier(0.4, 0, 1, 1);
    --ease-out: cubic-bezier(0, 0, 0.2, 1);
    --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);

    --duration-fast: 150ms;
    --duration-base: 250ms;
    --duration-slow: 350ms;
    --duration-slower: 500ms;

    --transition-fast: var(--duration-fast) var(--ease-default);
    --transition-base: var(--duration-base) var(--ease-default);
    --transition-slow: var(--duration-slow) var(--ease-default);
    --transition-spring: var(--duration-slower) var(--ease-spring);

    /* --- Z-index scale --- */
    --z-base: 0;
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-fixed: 300;
    --z-drawer: 400;
    --z-modal: 500;
    --z-toast: 600;
    --z-tooltip: 700;
    --z-max: 9999;

    /* --- Touch targets --- */
    --touch-min: 44px;
    --touch-comfortable: 48px;
    --touch-large: 56px;
}

/* ============================================================
   DARK THEME TOKENS
   ============================================================ */
.theme-dark {
    --surface-primary: var(--gray-950);
    --surface-secondary: var(--gray-900);
    --surface-elevated: var(--gray-800);
    --surface-inset: #0a0a0a;
    --surface-overlay: rgba(0, 0, 0, 0.75);

    --text-primary: var(--gray-100);
    --text-secondary: var(--gray-400);
    --text-tertiary: var(--gray-500);
    --text-accent: var(--accent-400);
    --text-link: var(--accent-300);

    --border-default: var(--gray-800);
    --border-subtle: var(--gray-900);
    --border-strong: var(--gray-700);

    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.2);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3), 0 1px 2px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.35);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.4);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.45);
    --shadow-2xl: 0 25px 50px rgba(0, 0, 0, 0.5);
    --shadow-accent: 0 4px 14px rgba(6, 182, 212, 0.2);
}

/* ============================================================
   ANIMATIONS
   ============================================================ */
@keyframes ds-fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes ds-fadeInUp {
    from { opacity: 0; transform: translateY(12px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes ds-fadeInDown {
    from { opacity: 0; transform: translateY(-12px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes ds-scaleIn {
    from { opacity: 0; transform: scale(0.95); }
    to { opacity: 1; transform: scale(1); }
}

@keyframes ds-slideInBottom {
    from { transform: translateY(100%); }
    to { transform: translateY(0); }
}

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

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

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

@keyframes ds-pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

@keyframes ds-bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-4px); }
}

/* ============================================================
   COMPONENT: SKELETON LOADING
   ============================================================ */
.ds-skeleton {
    background: linear-gradient(
        90deg,
        var(--border-default) 25%,
        var(--surface-secondary) 50%,
        var(--border-default) 75%
    );
    background-size: 200% 100%;
    animation: ds-shimmer 1.5s ease infinite;
    border-radius: var(--radius-md);
}

.ds-skeleton--text {
    height: 1em;
    width: 80%;
    margin-bottom: var(--space-2);
}

.ds-skeleton--title {
    height: 1.5em;
    width: 60%;
    margin-bottom: var(--space-3);
}

.ds-skeleton--avatar {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
}

.ds-skeleton--card {
    height: 200px;
    border-radius: var(--radius-lg);
}

.ds-skeleton--btn {
    height: var(--touch-comfortable);
    width: 120px;
    border-radius: var(--radius-md);
}

/* ============================================================
   COMPONENT: BUTTONS (Enhanced)
   ============================================================ */
.ds-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-5);
    min-height: var(--touch-min);
    border: none;
    border-radius: var(--radius-md);
    font-family: var(--font-sans);
    font-size: var(--text-sm);
    font-weight: 600;
    line-height: var(--leading-tight);
    white-space: nowrap;
    cursor: pointer;
    text-decoration: none;
    transition: all var(--transition-fast);
    position: relative;
    overflow: hidden;
    -webkit-tap-highlight-color: transparent;
    user-select: none;
}

.ds-btn:focus-visible {
    outline: 2px solid var(--accent-500);
    outline-offset: 2px;
}

.ds-btn:disabled,
.ds-btn[aria-disabled="true"] {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}

/* Button variants */
.ds-btn--primary {
    background: linear-gradient(135deg, var(--accent-500) 0%, var(--accent-700) 100%);
    color: var(--text-inverse);
    box-shadow: var(--shadow-accent);
}

.ds-btn--primary:hover:not(:disabled) {
    background: linear-gradient(135deg, var(--accent-400) 0%, var(--accent-600) 100%);
    box-shadow: var(--shadow-accent-lg);
    transform: translateY(-1px);
}

.ds-btn--primary:active:not(:disabled) {
    transform: translateY(0);
    box-shadow: var(--shadow-sm);
}

.ds-btn--secondary {
    background: var(--surface-secondary);
    color: var(--text-primary);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-default);
}

.ds-btn--secondary:hover:not(:disabled) {
    background: var(--surface-inset);
    border-color: var(--border-strong);
}

.ds-btn--ghost {
    background: transparent;
    color: var(--text-secondary);
}

.ds-btn--ghost:hover:not(:disabled) {
    background: var(--surface-inset);
    color: var(--text-primary);
}

.ds-btn--danger {
    background: var(--danger-500);
    color: var(--text-inverse);
    box-shadow: 0 4px 14px rgba(239, 68, 68, 0.3);
}

.ds-btn--danger:hover:not(:disabled) {
    background: var(--danger-600);
    transform: translateY(-1px);
}

.ds-btn--success {
    background: var(--success-500);
    color: var(--text-inverse);
}

.ds-btn--success:hover:not(:disabled) {
    background: var(--success-600);
    transform: translateY(-1px);
}

.ds-btn--outline {
    background: transparent;
    color: var(--accent-600);
    border: 2px solid var(--accent-500);
}

.ds-btn--outline:hover:not(:disabled) {
    background: var(--accent-50);
}

.theme-dark .ds-btn--outline:hover:not(:disabled) {
    background: rgba(6, 182, 212, 0.1);
}

/* Button sizes */
.ds-btn--xs {
    padding: var(--space-1) var(--space-3);
    min-height: 32px;
    font-size: var(--text-xs);
    border-radius: var(--radius-sm);
}

.ds-btn--sm {
    padding: var(--space-2) var(--space-4);
    min-height: 36px;
    font-size: var(--text-sm);
}

.ds-btn--lg {
    padding: var(--space-4) var(--space-8);
    min-height: var(--touch-large);
    font-size: var(--text-base);
}

.ds-btn--xl {
    padding: var(--space-5) var(--space-10);
    min-height: 64px;
    font-size: var(--text-lg);
    border-radius: var(--radius-lg);
}

.ds-btn--block {
    width: 100%;
}

.ds-btn--icon {
    padding: 0;
    width: var(--touch-min);
    height: var(--touch-min);
    border-radius: var(--radius-md);
}

/* Button loading state */
.ds-btn--loading {
    color: transparent !important;
    pointer-events: none;
}

.ds-btn--loading::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: #fff;
    border-radius: 50%;
    animation: ds-spin 0.6s linear infinite;
}

.ds-btn--secondary.ds-btn--loading::after {
    border-color: var(--border-default);
    border-top-color: var(--text-primary);
}

/* ============================================================
   COMPONENT: CARDS (Enhanced)
   ============================================================ */
.ds-card {
    background: var(--surface-secondary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
}

.ds-card--padded {
    padding: var(--space-6);
}

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

.ds-card--interactive:active {
    transform: translateY(0);
    box-shadow: var(--shadow-md);
}

.ds-card--outlined {
    box-shadow: none;
    border: 1px solid var(--border-default);
}

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

.ds-card--accent {
    border: 2px solid var(--accent-500);
}

.ds-card--accent::before {
    content: '';
    display: block;
    height: 4px;
    background: linear-gradient(90deg, var(--accent-500), var(--accent-400));
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    margin: -1px -1px 0;
}

.ds-card__header {
    padding: var(--space-5) var(--space-6);
    border-bottom: 1px solid var(--border-subtle);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-4);
}

.ds-card__body {
    padding: var(--space-6);
}

.ds-card__footer {
    padding: var(--space-4) var(--space-6);
    border-top: 1px solid var(--border-subtle);
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: var(--space-3);
}

/* ============================================================
   COMPONENT: BADGES
   ============================================================ */
.ds-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    padding: var(--space-1) var(--space-3);
    border-radius: var(--radius-full);
    font-size: var(--text-xs);
    font-weight: 700;
    letter-spacing: var(--tracking-wide);
    line-height: var(--leading-none);
    white-space: nowrap;
}

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

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

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

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

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

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

.theme-dark .ds-badge--neutral {
    background: var(--gray-800);
    color: var(--gray-300);
}

.theme-dark .ds-badge--accent {
    background: rgba(6, 182, 212, 0.15);
    color: var(--accent-300);
}

.theme-dark .ds-badge--success {
    background: rgba(34, 197, 94, 0.15);
    color: var(--success-500);
}

.theme-dark .ds-badge--warning {
    background: rgba(245, 158, 11, 0.15);
    color: var(--warning-500);
}

.theme-dark .ds-badge--danger {
    background: rgba(239, 68, 68, 0.15);
    color: var(--danger-500);
}

.theme-dark .ds-badge--info {
    background: rgba(59, 130, 246, 0.15);
    color: var(--info-500);
}

/* Badge with dot indicator */
.ds-badge--dot::before {
    content: '';
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: currentColor;
    flex-shrink: 0;
}

/* ============================================================
   COMPONENT: INPUTS
   ============================================================ */
.ds-input-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.ds-label {
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--text-primary);
}

.ds-label--required::after {
    content: ' *';
    color: var(--danger-500);
}

.ds-input,
.ds-select,
.ds-textarea {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    min-height: var(--touch-min);
    background: var(--surface-secondary);
    border: 2px solid var(--border-default);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: var(--text-base);
    transition: all var(--transition-fast);
    -webkit-appearance: none;
}

.ds-input:focus,
.ds-select:focus,
.ds-textarea:focus {
    outline: none;
    border-color: var(--accent-500);
    box-shadow: 0 0 0 3px rgba(6, 182, 212, 0.15);
}

.ds-input::placeholder {
    color: var(--text-tertiary);
}

.ds-input--error,
.ds-select--error,
.ds-textarea--error {
    border-color: var(--danger-500);
}

.ds-input--error:focus,
.ds-select--error:focus {
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.15);
}

.ds-input-hint {
    font-size: var(--text-xs);
    color: var(--text-tertiary);
}

.ds-input-error {
    font-size: var(--text-xs);
    color: var(--danger-500);
}

.ds-textarea {
    min-height: 120px;
    resize: vertical;
}

/* ============================================================
   COMPONENT: 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-reverse;
    gap: var(--space-3);
    pointer-events: none;
}

@media (max-width: 640px) {
    .ds-toast-container {
        left: var(--space-4);
        right: var(--space-4);
        bottom: var(--space-4);
    }
}

.ds-toast {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-4) var(--space-5);
    border-radius: var(--radius-lg);
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--text-inverse);
    box-shadow: var(--shadow-xl);
    pointer-events: auto;
    animation: ds-fadeInUp var(--duration-base) var(--ease-out);
}

.ds-toast--success { background: var(--success-600); }
.ds-toast--error { background: var(--danger-600); }
.ds-toast--warning { background: var(--warning-600); color: #000; }
.ds-toast--info { background: var(--accent-600); }

.ds-toast__dismiss {
    background: none;
    border: none;
    color: inherit;
    opacity: 0.7;
    cursor: pointer;
    padding: var(--space-1);
    margin-left: auto;
}

.ds-toast__dismiss:hover {
    opacity: 1;
}

/* ============================================================
   COMPONENT: MODAL & BOTTOM SHEET
   ============================================================ */
.ds-modal-overlay {
    position: fixed;
    inset: 0;
    background: var(--surface-overlay);
    backdrop-filter: blur(4px);
    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(--surface-secondary);
    border-radius: var(--radius-xl);
    max-width: 480px;
    width: 100%;
    max-height: 85vh;
    overflow-y: auto;
    box-shadow: var(--shadow-2xl);
    transform: scale(0.95) translateY(10px);
    transition: transform var(--transition-base);
}

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

.ds-modal__header {
    padding: var(--space-6) var(--space-6) var(--space-4);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.ds-modal__title {
    font-size: var(--text-xl);
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
}

.ds-modal__close {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    background: var(--surface-inset);
    border-radius: var(--radius-full);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.ds-modal__close:hover {
    background: var(--border-default);
    color: var(--text-primary);
}

.ds-modal__body {
    padding: var(--space-4) var(--space-6);
}

.ds-modal__footer {
    padding: var(--space-4) var(--space-6) var(--space-6);
    display: flex;
    gap: var(--space-3);
    justify-content: flex-end;
}

/* Bottom Sheet (mobile modal) */
@media (max-width: 640px) {
    .ds-modal-overlay--sheet {
        align-items: flex-end;
        padding: 0;
    }

    .ds-modal-overlay--sheet .ds-modal {
        max-width: 100%;
        max-height: 90vh;
        border-radius: var(--radius-xl) var(--radius-xl) 0 0;
        transform: translateY(100%);
    }

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

    .ds-modal-overlay--sheet .ds-modal::before {
        content: '';
        display: block;
        width: 36px;
        height: 4px;
        background: var(--border-strong);
        border-radius: var(--radius-full);
        margin: var(--space-3) auto;
    }
}

/* ============================================================
   COMPONENT: TABS (Scrollable on mobile)
   ============================================================ */
.ds-tabs {
    display: flex;
    gap: var(--space-1);
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    border-bottom: 2px solid var(--border-subtle);
    padding-bottom: 0;
}

.ds-tabs::-webkit-scrollbar {
    display: none;
}

.ds-tab {
    flex-shrink: 0;
    padding: var(--space-3) var(--space-5);
    background: none;
    border: none;
    border-bottom: 3px solid transparent;
    margin-bottom: -2px;
    font-family: var(--font-sans);
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--text-tertiary);
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
    min-height: var(--touch-min);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

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

.ds-tab.active,
.ds-tab[aria-selected="true"] {
    color: var(--text-accent);
    border-bottom-color: var(--accent-500);
}

.ds-tab__count {
    font-size: var(--text-xs);
    background: var(--surface-inset);
    padding: var(--space-0-5) var(--space-2);
    border-radius: var(--radius-full);
    min-width: 20px;
    text-align: center;
}

.ds-tab.active .ds-tab__count {
    background: var(--accent-100);
    color: var(--accent-700);
}

.theme-dark .ds-tab.active .ds-tab__count {
    background: rgba(6, 182, 212, 0.15);
    color: var(--accent-300);
}

/* ============================================================
   COMPONENT: AVATAR
   ============================================================ */
.ds-avatar {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    font-weight: 700;
    font-size: var(--text-sm);
    color: var(--text-inverse);
    text-transform: uppercase;
    flex-shrink: 0;
    overflow: hidden;
}

.ds-avatar--sm { width: 32px; height: 32px; font-size: var(--text-xs); }
.ds-avatar--lg { width: 48px; height: 48px; font-size: var(--text-base); }
.ds-avatar--xl { width: 64px; height: 64px; font-size: var(--text-lg); }

.ds-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* ============================================================
   COMPONENT: EMPTY STATE
   ============================================================ */
.ds-empty {
    text-align: center;
    padding: var(--space-16) var(--space-8);
}

.ds-empty__icon {
    font-size: 3rem;
    color: var(--text-tertiary);
    margin-bottom: var(--space-4);
    opacity: 0.5;
}

.ds-empty__title {
    font-size: var(--text-xl);
    font-weight: 700;
    color: var(--text-primary);
    margin: 0 0 var(--space-2);
}

.ds-empty__text {
    font-size: var(--text-sm);
    color: var(--text-secondary);
    max-width: 320px;
    margin: 0 auto var(--space-6);
    line-height: var(--leading-relaxed);
}

/* ============================================================
   COMPONENT: PULL TO REFRESH
   ============================================================ */
.ds-ptr {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-4);
    color: var(--text-tertiary);
    font-size: var(--text-sm);
    overflow: hidden;
    max-height: 0;
    transition: max-height var(--transition-base);
}

.ds-ptr.active {
    max-height: 60px;
}

.ds-ptr__spinner {
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-default);
    border-top-color: var(--accent-500);
    border-radius: 50%;
    animation: ds-spin 0.8s linear infinite;
    margin-right: var(--space-2);
}

/* ============================================================
   COMPONENT: TOGGLE SWITCH
   ============================================================ */
.ds-toggle {
    display: inline-flex;
    align-items: center;
    gap: var(--space-3);
    cursor: pointer;
}

.ds-toggle__input {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.ds-toggle__track {
    position: relative;
    width: 48px;
    height: 28px;
    background: var(--gray-300);
    border-radius: var(--radius-full);
    transition: background var(--transition-fast);
}

.ds-toggle__track::after {
    content: '';
    position: absolute;
    top: 3px;
    left: 3px;
    width: 22px;
    height: 22px;
    background: white;
    border-radius: 50%;
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-fast);
}

.ds-toggle__input:checked + .ds-toggle__track {
    background: var(--accent-500);
}

.ds-toggle__input:checked + .ds-toggle__track::after {
    transform: translateX(20px);
}

.ds-toggle__input:focus-visible + .ds-toggle__track {
    outline: 2px solid var(--accent-500);
    outline-offset: 2px;
}

.ds-toggle__label {
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--text-primary);
}

.theme-dark .ds-toggle__track {
    background: var(--gray-700);
}

/* ============================================================
   COMPONENT: DROPDOWN
   ============================================================ */
.ds-dropdown {
    position: relative;
    display: inline-block;
}

.ds-dropdown__menu {
    position: absolute;
    top: calc(100% + var(--space-2));
    right: 0;
    min-width: 200px;
    background: var(--surface-secondary);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    z-index: var(--z-dropdown);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: all var(--transition-fast);
    overflow: hidden;
    padding: var(--space-1);
}

.ds-dropdown__menu.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.ds-dropdown__item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    width: 100%;
    padding: var(--space-3) var(--space-4);
    background: none;
    border: none;
    border-radius: var(--radius-sm);
    font-family: var(--font-sans);
    font-size: var(--text-sm);
    color: var(--text-primary);
    cursor: pointer;
    transition: background var(--transition-fast);
    text-align: left;
}

.ds-dropdown__item:hover {
    background: var(--surface-inset);
}

.ds-dropdown__item--danger {
    color: var(--danger-500);
}

.ds-dropdown__divider {
    height: 1px;
    background: var(--border-subtle);
    margin: var(--space-1) 0;
}

/* ============================================================
   COMPONENT: TOOLTIP
   ============================================================ */
[data-tooltip] {
    position: relative;
}

[data-tooltip]::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: calc(100% + 8px);
    left: 50%;
    transform: translateX(-50%);
    padding: var(--space-2) var(--space-3);
    background: var(--gray-900);
    color: var(--text-inverse);
    font-size: var(--text-xs);
    font-weight: 500;
    border-radius: var(--radius-sm);
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-fast);
    pointer-events: none;
    z-index: var(--z-tooltip);
}

[data-tooltip]:hover::after {
    opacity: 1;
    visibility: visible;
}

/* Hide tooltips on touch devices */
@media (hover: none) {
    [data-tooltip]::after {
        display: none;
    }
}

/* ============================================================
   UTILITY: RESPONSIVE VISIBILITY
   ============================================================ */
@media (max-width: 640px) {
    .ds-hide-mobile { display: none !important; }
}

@media (min-width: 641px) and (max-width: 1024px) {
    .ds-hide-tablet { display: none !important; }
}

@media (min-width: 1025px) {
    .ds-hide-desktop { display: none !important; }
}

@media (max-width: 1024px) {
    .ds-show-desktop-only { display: none !important; }
}

@media (min-width: 641px) {
    .ds-show-mobile-only { display: none !important; }
}

/* ============================================================
   UTILITY: ANIMATION CLASSES
   ============================================================ */
.ds-animate-in {
    animation: ds-fadeInUp var(--duration-base) var(--ease-out) both;
}

.ds-animate-in-delay-1 { animation-delay: 50ms; }
.ds-animate-in-delay-2 { animation-delay: 100ms; }
.ds-animate-in-delay-3 { animation-delay: 150ms; }
.ds-animate-in-delay-4 { animation-delay: 200ms; }

/* ============================================================
   UTILITY: FOCUS RING
   ============================================================ */
.ds-focus-ring:focus-visible {
    outline: 2px solid var(--accent-500);
    outline-offset: 2px;
}

/* ============================================================
   REDUCED MOTION
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}