/**
 * FreeRide Explorer - Design System v1.0
 * 
 * Centralized design tokens, utilities, and components
 * Supports Light & Dark modes
 * 8px grid system
 * 
 * @package FreeRide_Explorer
 * @since 2.4.0
 */

/* ===========================================
   1. CSS CUSTOM PROPERTIES (Design Tokens)
   =========================================== */

:root {
    /* === Brand Colors === */
    --fre-primary: #FF6B5E;
    --fre-primary-hover: #E85A4F;
    --fre-primary-light: #FFE5E3;
    --fre-primary-dark: #D94A3D;
    
    --fre-secondary: #47B0CE;
    --fre-secondary-hover: #3A9BB8;
    --fre-secondary-light: #E0F4FA;
    --fre-secondary-dark: #2D7A8F;
    
    /* === Semantic Colors === */
    --fre-success: #22C55E;
    --fre-success-light: #DCFCE7;
    --fre-success-dark: #16A34A;
    
    --fre-warning: #F59E0B;
    --fre-warning-light: #FEF3C7;
    --fre-warning-dark: #D97706;
    
    --fre-danger: #EF4444;
    --fre-danger-light: #FEE2E2;
    --fre-danger-dark: #DC2626;
    
    --fre-info: #3B82F6;
    --fre-info-light: #DBEAFE;
    --fre-info-dark: #2563EB;
    
    /* === Neutral Colors (Light Mode) === */
    --fre-white: #FFFFFF;
    --fre-black: #000000;
    --fre-gray-50: #F9FAFB;
    --fre-gray-100: #F3F4F6;
    --fre-gray-200: #E5E7EB;
    --fre-gray-300: #D1D5DB;
    --fre-gray-400: #9CA3AF;
    --fre-gray-500: #6B7280;
    --fre-gray-600: #4B5563;
    --fre-gray-700: #374151;
    --fre-gray-800: #1F2937;
    --fre-gray-900: #111827;
    
    /* === Semantic Mappings (Light Mode) === */
    --fre-bg: var(--fre-white);
    --fre-bg-secondary: var(--fre-gray-50);
    --fre-bg-tertiary: var(--fre-gray-100);
    --fre-bg-elevated: var(--fre-white);
    --fre-bg-overlay: rgba(0, 0, 0, 0.5);
    
    --fre-text: var(--fre-gray-900);
    --fre-text-secondary: var(--fre-gray-600);
    --fre-text-muted: var(--fre-gray-500);
    --fre-text-disabled: var(--fre-gray-400);
    --fre-text-inverse: var(--fre-white);
    
    --fre-border: var(--fre-gray-200);
    --fre-border-light: var(--fre-gray-100);
    --fre-border-focus: var(--fre-secondary);
    
    --fre-input-bg: var(--fre-white);
    --fre-input-border: var(--fre-gray-300);
    --fre-input-placeholder: var(--fre-gray-400);
    
    /* === Spacing (8px Grid) === */
    --space-0: 0;
    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-5: 20px;
    --space-6: 24px;
    --space-8: 32px;
    --space-10: 40px;
    --space-12: 48px;
    --space-16: 64px;
    --space-20: 80px;
    
    /* === Typography === */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'SF Mono', 'Fira Code', monospace;
    
    --text-xs: 11px;
    --text-sm: 13px;
    --text-base: 15px;
    --text-lg: 17px;
    --text-xl: 20px;
    --text-2xl: 24px;
    --text-3xl: 30px;
    --text-4xl: 36px;
    
    --leading-none: 1;
    --leading-tight: 1.25;
    --leading-normal: 1.5;
    --leading-relaxed: 1.625;
    
    --font-normal: 400;
    --font-medium: 500;
    --font-semibold: 600;
    --font-bold: 700;
    --font-extrabold: 800;
    
    /* === Border Radius === */
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-2xl: 20px;
    --radius-full: 9999px;
    
    /* === Shadows === */
    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    --shadow-inner: inset 0 2px 4px rgba(0, 0, 0, 0.06);
    --shadow-focus: 0 0 0 3px rgba(71, 176, 206, 0.3);
    --shadow-focus-danger: 0 0 0 3px rgba(239, 68, 68, 0.3);
    
    /* === Transitions === */
    --transition-fast: 0.15s ease;
    --transition-base: 0.2s ease;
    --transition-slow: 0.3s ease;
    --transition-slower: 0.5s ease;
    
    --ease-in: cubic-bezier(0.4, 0, 1, 1);
    --ease-out: cubic-bezier(0, 0, 0.2, 1);
    --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
    --ease-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);
    
    /* === Z-Index Scale === */
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-fixed: 300;
    --z-modal-backdrop: 400;
    --z-modal: 500;
    --z-popover: 600;
    --z-tooltip: 700;
    --z-toast: 800;
    --z-max: 9999;
    
    /* === Touch Targets === */
    --touch-target-min: 44px;
    --touch-target-comfortable: 48px;
    
    /* === Safe Areas === */
    --safe-top: env(safe-area-inset-top, 0px);
    --safe-bottom: env(safe-area-inset-bottom, 0px);
    --safe-left: env(safe-area-inset-left, 0px);
    --safe-right: env(safe-area-inset-right, 0px);
    
    /* === Map Colors === */
    --map-route: var(--fre-primary);
    --map-route-alt: var(--fre-secondary);
    --map-poi-default: var(--fre-gray-600);
    --map-start: var(--fre-success);
    --map-end: var(--fre-danger);
}

/* ===========================================
   2. DARK MODE
   =========================================== */

[data-theme="dark"],
.dark-mode {
    --fre-bg: #0F172A;
    --fre-bg-secondary: #1E293B;
    --fre-bg-tertiary: #334155;
    --fre-bg-elevated: #1E293B;
    --fre-bg-overlay: rgba(0, 0, 0, 0.7);
    
    --fre-text: #F1F5F9;
    --fre-text-secondary: #CBD5E1;
    --fre-text-muted: #94A3B8;
    --fre-text-disabled: #64748B;
    --fre-text-inverse: var(--fre-gray-900);
    
    --fre-border: #334155;
    --fre-border-light: #1E293B;
    --fre-border-focus: var(--fre-secondary);
    
    --fre-input-bg: #1E293B;
    --fre-input-border: #475569;
    --fre-input-placeholder: #64748B;
    
    --fre-gray-50: #1E293B;
    --fre-gray-100: #334155;
    --fre-gray-200: #475569;
    --fre-gray-800: #E2E8F0;
    --fre-gray-900: #F8FAFC;
    
    /* Adjusted shadows for dark mode */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.6);
}

/* Auto dark mode based on system preference */
@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --fre-bg: #0F172A;
        --fre-bg-secondary: #1E293B;
        --fre-bg-tertiary: #334155;
        --fre-bg-elevated: #1E293B;
        --fre-bg-overlay: rgba(0, 0, 0, 0.7);
        
        --fre-text: #F1F5F9;
        --fre-text-secondary: #CBD5E1;
        --fre-text-muted: #94A3B8;
        --fre-text-disabled: #64748B;
        
        --fre-border: #334155;
        --fre-border-light: #1E293B;
        
        --fre-input-bg: #1E293B;
        --fre-input-border: #475569;
        --fre-input-placeholder: #64748B;
    }
}

/* ===========================================
   3. BASE STYLES
   =========================================== */

*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

body {
    font-family: var(--font-family);
    font-size: var(--text-base);
    line-height: var(--leading-normal);
    color: var(--fre-text);
    background-color: var(--fre-bg);
    transition: background-color var(--transition-slow), color var(--transition-slow);
}

/* ===========================================
   4. TYPOGRAPHY UTILITIES
   =========================================== */

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

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

.leading-none { line-height: var(--leading-none); }
.leading-tight { line-height: var(--leading-tight); }
.leading-normal { line-height: var(--leading-normal); }
.leading-relaxed { line-height: var(--leading-relaxed); }

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.text-primary { color: var(--fre-primary); }
.text-secondary { color: var(--fre-text-secondary); }
.text-muted { color: var(--fre-text-muted); }
.text-success { color: var(--fre-success); }
.text-warning { color: var(--fre-warning); }
.text-danger { color: var(--fre-danger); }

.truncate {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.line-clamp-2 {
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.line-clamp-3 {
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* ===========================================
   5. SPACING UTILITIES (8px Grid)
   =========================================== */

/* Margin */
.m-0 { margin: var(--space-0); }
.m-1 { margin: var(--space-1); }
.m-2 { margin: var(--space-2); }
.m-3 { margin: var(--space-3); }
.m-4 { margin: var(--space-4); }
.m-5 { margin: var(--space-5); }
.m-6 { margin: var(--space-6); }
.m-8 { margin: var(--space-8); }

.mt-0 { margin-top: var(--space-0); }
.mt-1 { margin-top: var(--space-1); }
.mt-2 { margin-top: var(--space-2); }
.mt-3 { margin-top: var(--space-3); }
.mt-4 { margin-top: var(--space-4); }
.mt-5 { margin-top: var(--space-5); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }

.mb-0 { margin-bottom: var(--space-0); }
.mb-1 { margin-bottom: var(--space-1); }
.mb-2 { margin-bottom: var(--space-2); }
.mb-3 { margin-bottom: var(--space-3); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-5 { margin-bottom: var(--space-5); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }

.ml-0 { margin-left: var(--space-0); }
.ml-1 { margin-left: var(--space-1); }
.ml-2 { margin-left: var(--space-2); }
.ml-3 { margin-left: var(--space-3); }
.ml-4 { margin-left: var(--space-4); }

.mr-0 { margin-right: var(--space-0); }
.mr-1 { margin-right: var(--space-1); }
.mr-2 { margin-right: var(--space-2); }
.mr-3 { margin-right: var(--space-3); }
.mr-4 { margin-right: var(--space-4); }

.mx-auto { margin-left: auto; margin-right: auto; }
.my-0 { margin-top: var(--space-0); margin-bottom: var(--space-0); }
.my-2 { margin-top: var(--space-2); margin-bottom: var(--space-2); }
.my-4 { margin-top: var(--space-4); margin-bottom: var(--space-4); }

/* Padding */
.p-0 { padding: var(--space-0); }
.p-1 { padding: var(--space-1); }
.p-2 { padding: var(--space-2); }
.p-3 { padding: var(--space-3); }
.p-4 { padding: var(--space-4); }
.p-5 { padding: var(--space-5); }
.p-6 { padding: var(--space-6); }
.p-8 { padding: var(--space-8); }

.pt-0 { padding-top: var(--space-0); }
.pt-2 { padding-top: var(--space-2); }
.pt-4 { padding-top: var(--space-4); }
.pt-6 { padding-top: var(--space-6); }

.pb-0 { padding-bottom: var(--space-0); }
.pb-2 { padding-bottom: var(--space-2); }
.pb-4 { padding-bottom: var(--space-4); }
.pb-6 { padding-bottom: var(--space-6); }

.px-2 { padding-left: var(--space-2); padding-right: var(--space-2); }
.px-3 { padding-left: var(--space-3); padding-right: var(--space-3); }
.px-4 { padding-left: var(--space-4); padding-right: var(--space-4); }
.px-6 { padding-left: var(--space-6); padding-right: var(--space-6); }

.py-2 { padding-top: var(--space-2); padding-bottom: var(--space-2); }
.py-3 { padding-top: var(--space-3); padding-bottom: var(--space-3); }
.py-4 { padding-top: var(--space-4); padding-bottom: var(--space-4); }
.py-6 { padding-top: var(--space-6); padding-bottom: var(--space-6); }

/* Gap */
.gap-1 { gap: var(--space-1); }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }
.gap-8 { gap: var(--space-8); }

/* ===========================================
   6. LAYOUT UTILITIES
   =========================================== */

.flex { display: flex; }
.inline-flex { display: inline-flex; }
.grid { display: grid; }
.block { display: block; }
.inline-block { display: inline-block; }
.hidden { display: none !important; }

.flex-col { flex-direction: column; }
.flex-row { flex-direction: row; }
.flex-wrap { flex-wrap: wrap; }

.items-start { align-items: flex-start; }
.items-center { align-items: center; }
.items-end { align-items: flex-end; }
.items-stretch { align-items: stretch; }

.justify-start { justify-content: flex-start; }
.justify-center { justify-content: center; }
.justify-end { justify-content: flex-end; }
.justify-between { justify-content: space-between; }
.justify-around { justify-content: space-around; }

.flex-1 { flex: 1 1 0%; }
.flex-auto { flex: 1 1 auto; }
.flex-none { flex: none; }
.flex-shrink-0 { flex-shrink: 0; }

.w-full { width: 100%; }
.h-full { height: 100%; }
.min-h-screen { min-height: 100vh; }

.relative { position: relative; }
.absolute { position: absolute; }
.fixed { position: fixed; }
.sticky { position: sticky; }

.inset-0 { top: 0; right: 0; bottom: 0; left: 0; }
.top-0 { top: 0; }
.right-0 { right: 0; }
.bottom-0 { bottom: 0; }
.left-0 { left: 0; }

.overflow-hidden { overflow: hidden; }
.overflow-auto { overflow: auto; }
.overflow-y-auto { overflow-y: auto; }

/* ===========================================
   7. COMPONENT STYLES
   =========================================== */

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-4);
    font-family: var(--font-family);
    font-size: var(--text-sm);
    font-weight: var(--font-semibold);
    line-height: var(--leading-tight);
    text-decoration: none;
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-fast);
    min-height: var(--touch-target-min);
    -webkit-tap-highlight-color: transparent;
    user-select: none;
}

.btn:focus-visible {
    outline: none;
    box-shadow: var(--shadow-focus);
}

.btn:active {
    transform: scale(0.97);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.btn svg {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}

.btn-primary {
    background: var(--fre-primary);
    color: var(--fre-white);
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover:not(:disabled) {
    background: var(--fre-primary-hover);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: var(--fre-bg-tertiary);
    color: var(--fre-text);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--fre-border);
}

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

.btn-ghost:hover:not(:disabled) {
    background: var(--fre-bg-tertiary);
    color: var(--fre-text);
}

.btn-danger {
    background: var(--fre-danger);
    color: var(--fre-white);
}

.btn-danger:hover:not(:disabled) {
    background: var(--fre-danger-dark);
}

.btn-success {
    background: var(--fre-success);
    color: var(--fre-white);
}

.btn-success:hover:not(:disabled) {
    background: var(--fre-success-dark);
}

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

.btn-icon svg {
    width: 22px;
    height: 22px;
}

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

.btn-sm {
    padding: var(--space-2) var(--space-3);
    font-size: var(--text-xs);
    min-height: 36px;
}

/* Ripple Effect */
.btn-ripple {
    position: relative;
    overflow: hidden;
}

.btn-ripple::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    background: radial-gradient(circle, rgba(255,255,255,0.3) 10%, transparent 10%);
    background-repeat: no-repeat;
    background-position: 50%;
    transform: scale(10, 10);
    opacity: 0;
    transition: transform 0.5s, opacity 0.5s;
}

.btn-ripple:active::after {
    transform: scale(0, 0);
    opacity: 1;
    transition: 0s;
}

/* Inputs */
.input,
.textarea,
.select {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    font-family: var(--font-family);
    font-size: var(--text-base);
    line-height: var(--leading-normal);
    color: var(--fre-text);
    background: var(--fre-input-bg);
    border: 1px solid var(--fre-input-border);
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
    min-height: var(--touch-target-min);
}

.input:focus,
.textarea:focus,
.select:focus {
    outline: none;
    border-color: var(--fre-border-focus);
    box-shadow: var(--shadow-focus);
}

.input::placeholder,
.textarea::placeholder {
    color: var(--fre-input-placeholder);
}

.input:disabled,
.textarea:disabled,
.select:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    background: var(--fre-bg-tertiary);
}

.textarea {
    min-height: 100px;
    resize: vertical;
}

.select {
    appearance: none;
    padding-right: var(--space-10);
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='20' height='20' viewBox='0 0 24 24' fill='none' stroke='%236B7280' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right var(--space-3) center;
    cursor: pointer;
}

.label {
    display: block;
    font-size: var(--text-sm);
    font-weight: var(--font-semibold);
    color: var(--fre-text);
    margin-bottom: var(--space-2);
}

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

.field {
    margin-bottom: var(--space-4);
}

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

.field-error .input:focus,
.field-error .textarea:focus {
    box-shadow: var(--shadow-focus-danger);
}

.error-message {
    font-size: var(--text-sm);
    color: var(--fre-danger);
    margin-top: var(--space-1);
}

/* Cards */
.card {
    background: var(--fre-bg-elevated);
    border: 1px solid var(--fre-border-light);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    transition: all var(--transition-base);
}

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

.card-header {
    padding: var(--space-4) var(--space-5);
    border-bottom: 1px solid var(--fre-border-light);
}

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

.card-footer {
    padding: var(--space-4) var(--space-5);
    border-top: 1px solid var(--fre-border-light);
    background: var(--fre-bg-secondary);
}

/* Badges */
.badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    padding: var(--space-1) var(--space-2);
    font-size: var(--text-xs);
    font-weight: var(--font-semibold);
    border-radius: var(--radius-full);
}

.badge-primary {
    background: var(--fre-primary-light);
    color: var(--fre-primary-dark);
}

.badge-success {
    background: var(--fre-success-light);
    color: var(--fre-success-dark);
}

.badge-warning {
    background: var(--fre-warning-light);
    color: var(--fre-warning-dark);
}

.badge-danger {
    background: var(--fre-danger-light);
    color: var(--fre-danger-dark);
}

.badge-info {
    background: var(--fre-info-light);
    color: var(--fre-info-dark);
}

/* Chips */
.chip {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    background: var(--fre-bg-tertiary);
    color: var(--fre-text-secondary);
    border: 2px solid transparent;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-fast);
    user-select: none;
}

.chip:hover {
    background: var(--fre-border);
}

.chip.selected {
    background: var(--fre-primary);
    color: var(--fre-white);
    border-color: var(--fre-primary);
}

/* Avatar */
.avatar {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    background: var(--fre-bg-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: var(--font-semibold);
    color: var(--fre-text-muted);
    overflow: hidden;
}

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

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

/* ===========================================
   8. ANIMATION UTILITIES
   =========================================== */

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes fadeOut {
    from { opacity: 1; }
    to { opacity: 0; }
}

@keyframes slideUp {
    from { transform: translateY(20px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

@keyframes slideDown {
    from { transform: translateY(-20px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

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

@keyframes slideOutRight {
    from { transform: translateX(0); }
    to { transform: translateX(100%); }
}

@keyframes slideInUp {
    from { transform: translateY(100%); }
    to { transform: translateY(0); }
}

@keyframes scaleIn {
    from { transform: scale(0.9); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}

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

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

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

.animate-fadeIn { animation: fadeIn var(--transition-base) var(--ease-out); }
.animate-slideUp { animation: slideUp var(--transition-slow) var(--ease-out); }
.animate-slideDown { animation: slideDown var(--transition-slow) var(--ease-out); }
.animate-scaleIn { animation: scaleIn var(--transition-base) var(--ease-out); }
.animate-spin { animation: spin 1s linear infinite; }
.animate-pulse { animation: pulse 2s var(--ease-in-out) infinite; }
.animate-bounce { animation: bounce 1s var(--ease-in-out) infinite; }

/* ===========================================
   9. DARK MODE TOGGLE COMPONENT
   =========================================== */

.theme-toggle {
    position: relative;
    width: 56px;
    height: 28px;
    background: var(--fre-bg-tertiary);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: background var(--transition-base);
    border: none;
    padding: 2px;
}

.theme-toggle::before {
    content: '';
    position: absolute;
    top: 2px;
    left: 2px;
    width: 24px;
    height: 24px;
    background: var(--fre-white);
    border-radius: var(--radius-full);
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-base);
}

.theme-toggle[aria-pressed="true"]::before {
    transform: translateX(28px);
}

.theme-toggle[aria-pressed="true"] {
    background: var(--fre-secondary);
}

.theme-toggle .icon-sun,
.theme-toggle .icon-moon {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 16px;
    height: 16px;
    transition: opacity var(--transition-fast);
}

.theme-toggle .icon-sun {
    left: 6px;
    opacity: 1;
}

.theme-toggle .icon-moon {
    right: 6px;
    opacity: 0.4;
}

.theme-toggle[aria-pressed="true"] .icon-sun {
    opacity: 0.4;
}

.theme-toggle[aria-pressed="true"] .icon-moon {
    opacity: 1;
}

/* ===========================================
   10. RESPONSIVE UTILITIES
   =========================================== */

/* Mobile first breakpoints */
@media (min-width: 640px) {
    .sm\:hidden { display: none; }
    .sm\:block { display: block; }
    .sm\:flex { display: flex; }
    .sm\:grid { display: grid; }
}

@media (min-width: 768px) {
    .md\:hidden { display: none; }
    .md\:block { display: block; }
    .md\:flex { display: flex; }
    .md\:grid { display: grid; }
}

@media (min-width: 1024px) {
    .lg\:hidden { display: none; }
    .lg\:block { display: block; }
    .lg\:flex { display: flex; }
    .lg\:grid { display: grid; }
}

@media (min-width: 1280px) {
    .xl\:hidden { display: none; }
    .xl\:block { display: block; }
    .xl\:flex { display: flex; }
}

/* Touch device detection */
@media (hover: none) and (pointer: coarse) {
    .hover-only { display: none; }
}

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