/* ============================================
   PREPAPROFS - DESIGN SYSTEM
   Fun & Serious Design for Students
   ============================================ */

/* ============================================
   1. CSS VARIABLES (Couleurs & Tokens)
   ============================================ */
:root {
    /* Couleurs principales */
    --primary: #3F51B5;
    --primary-light: #5C6BC0;
    --primary-dark: #303F9F;
    --primary-gradient: linear-gradient(135deg, #3F51B5 0%, #5C6BC0 50%, #7986CB 100%);

    /* Couleurs secondaires */
    --secondary: #FF6B6B;
    --secondary-light: #FF8E8E;

    /* Couleurs de succès/erreur */
    --success: #4CAF50;
    --success-light: #81C784;
    --error: #F44336;
    --error-light: #E57373;
    --warning: #FF9800;
    --info: #2196F3;

    /* Neutres */
    --white: #FFFFFF;
    --gray-50: #FAFAFA;
    --gray-100: #F5F5F5;
    --gray-200: #EEEEEE;
    --gray-300: #E0E0E0;
    --gray-400: #BDBDBD;
    --gray-500: #9E9E9E;
    --gray-600: #757575;
    --gray-700: #616161;
    --gray-800: #424242;
    --gray-900: #212121;
    --black: #000000;

    /* Textes */
    --text-primary: #212121;
    --text-secondary: #757575;
    --text-light: #FFFFFF;
    --text-muted: #9E9E9E;

    /* Backgrounds */
    --bg-primary: #FFFFFF;
    --bg-secondary: #F5F7FA;
    --bg-dark: #1A1A2E;
    --bg-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --bg-dots: radial-gradient(circle, var(--primary) 1px, transparent 1px);

    /* Ombres */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.15);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.2);
    --shadow-primary: 0 4px 14px rgba(63, 81, 181, 0.4);
    --shadow-hover: 0 8px 25px rgba(63, 81, 181, 0.3);

    /* Glass effect */
    --glass-bg: rgba(255, 255, 255, 0.85);
    --glass-border: rgba(255, 255, 255, 0.18);

    /* Rayons */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 50%;

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    --transition-bounce: 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);

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

    /* Spacing */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-2xl: 48px;
    --space-3xl: 64px;
}

/* ============================================
   2. RESET & BASE
   ============================================ */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-secondary);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Import Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

/* ============================================
   3. BACKGROUND PATTERNS
   ============================================ */
.bg-dots {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: var(--bg-dots);
    background-size: 20px 20px;
    opacity: 0.3;
    pointer-events: none;
    z-index: -1;
}

.bg-gradient {
    background: linear-gradient(135deg, #3F51B5 0%, #5C6BC0 100%);
}

.bg-animated {
    background: linear-gradient(-45deg, #3F51B5, #5C6BC0, #7986CB, #3F51B5);
    background-size: 400% 400%;
    animation: gradientShift 15s ease infinite;
}

@keyframes gradientShift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

/* Floating shapes background */
.bg-shapes {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    z-index: -1;
}

.floating-shape {
    position: absolute;
    background: var(--primary);
    opacity: 0.1;
    border-radius: 50%;
    animation: float 20s infinite ease-in-out;
}

.floating-shape:nth-child(1) {
    width: 80px;
    height: 80px;
    left: 10%;
    top: 20%;
    animation-delay: 0s;
}

.floating-shape:nth-child(2) {
    width: 120px;
    height: 120px;
    right: 15%;
    top: 10%;
    animation-delay: -5s;
}

.floating-shape:nth-child(3) {
    width: 60px;
    height: 60px;
    left: 70%;
    bottom: 20%;
    animation-delay: -10s;
}

.floating-shape:nth-child(4) {
    width: 100px;
    height: 100px;
    left: 5%;
    bottom: 10%;
    animation-delay: -15s;
}

@keyframes float {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    33% { transform: translateY(-30px) rotate(120deg); }
    66% { transform: translateY(20px) rotate(240deg); }
}

/* ============================================
   4. TYPOGRAPHY
   ============================================ */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    color: var(--text-primary);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1rem; }
h6 { font-size: 0.875rem; }

.text-gradient {
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.text-primary { color: var(--primary) !important; }
.text-secondary { color: var(--text-secondary) !important; }
.text-success { color: var(--success) !important; }
.text-error { color: var(--error) !important; }
.text-white { color: var(--white) !important; }

/* ============================================
   5. BUTTONS
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: 12px 24px;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left var(--transition-slow);
}

.btn:hover::before {
    left: 100%;
}

/* Primary Button */
.btn-primary {
    background: var(--primary);
    color: var(--white);
    box-shadow: var(--shadow-primary);
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

.btn-primary:active {
    transform: translateY(0);
}

/* Secondary Button */
.btn-secondary {
    background: var(--white);
    color: var(--primary);
    border: 2px solid var(--primary);
}

.btn-secondary:hover {
    background: var(--primary);
    color: var(--white);
    transform: translateY(-2px);
}

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

.btn-ghost:hover {
    background: rgba(63, 81, 181, 0.1);
}

/* Danger Button */
.btn-danger {
    background: var(--error);
    color: var(--white);
}

.btn-danger:hover {
    background: #D32F2F;
    transform: translateY(-2px);
}

/* Button Sizes */
.btn-sm {
    padding: 8px 16px;
    font-size: 0.875rem;
}

.btn-lg {
    padding: 16px 32px;
    font-size: 1.125rem;
}

/* Button with Icon */
.btn-icon {
    width: 44px;
    height: 44px;
    padding: 0;
    border-radius: var(--radius-full);
}

/* Pulse animation for CTA */
.btn-pulse {
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { box-shadow: 0 0 0 0 rgba(63, 81, 181, 0.7); }
    70% { box-shadow: 0 0 0 15px rgba(63, 81, 181, 0); }
    100% { box-shadow: 0 0 0 0 rgba(63, 81, 181, 0); }
}

/* ============================================
   6. CARDS
   ============================================ */
.card {
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: var(--space-xl);
    transition: all var(--transition-normal);
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.card-glass {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
}

.card-interactive {
    cursor: pointer;
}

.card-interactive:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: var(--shadow-xl);
}

.card-header {
    padding-bottom: var(--space-md);
    border-bottom: 1px solid var(--gray-200);
    margin-bottom: var(--space-md);
}

.card-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

.card-subtitle {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-top: var(--space-xs);
}

.card-body {
    flex: 1;
}

.card-footer {
    padding-top: var(--space-md);
    border-top: 1px solid var(--gray-200);
    margin-top: var(--space-md);
}

/* Stat Card */
.stat-card {
    text-align: center;
    position: relative;
    overflow: hidden;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 100%;
    height: 100%;
    background: var(--primary);
    opacity: 0.05;
    border-radius: 50%;
    transition: transform var(--transition-slow);
}

.stat-card:hover::before {
    transform: scale(2);
}

.stat-value {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--primary);
    line-height: 1;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-top: var(--space-sm);
}

.stat-icon {
    font-size: 2rem;
    margin-bottom: var(--space-md);
    opacity: 0.8;
}

/* ============================================
   7. FORMS
   ============================================ */
.form-group {
    margin-bottom: var(--space-lg);
}

.form-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-sm);
}

.form-input {
    width: 100%;
    padding: 14px 16px;
    font-size: 1rem;
    font-family: inherit;
    color: var(--text-primary);
    background: var(--white);
    border: 2px solid var(--gray-300);
    border-radius: var(--radius-md);
    transition: all var(--transition-normal);
}

.form-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(63, 81, 181, 0.1);
}

.form-input::placeholder {
    color: var(--text-muted);
}

.form-input:hover:not(:focus) {
    border-color: var(--gray-400);
}

/* Input with icon */
.input-group {
    position: relative;
}

.input-group .form-input {
    padding-left: 48px;
}

.input-icon {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    transition: color var(--transition-fast);
}

.input-group:focus-within .input-icon {
    color: var(--primary);
}

/* Floating label */
.form-floating {
    position: relative;
}

.form-floating .form-input {
    padding-top: 24px;
    padding-bottom: 8px;
}

.form-floating .form-label {
    position: absolute;
    top: 50%;
    left: 16px;
    transform: translateY(-50%);
    transition: all var(--transition-fast);
    pointer-events: none;
    margin-bottom: 0;
    color: var(--text-muted);
    font-weight: 400;
}

.form-floating .form-input:focus ~ .form-label,
.form-floating .form-input:not(:placeholder-shown) ~ .form-label {
    top: 12px;
    font-size: 0.75rem;
    color: var(--primary);
    font-weight: 600;
}

/* ============================================
   8. NAVBAR
   ============================================ */
.navbar {
    background: var(--white);
    box-shadow: var(--shadow-sm);
    padding: var(--space-md) var(--space-xl);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: all var(--transition-normal);
}

.navbar.scrolled {
    box-shadow: var(--shadow-md);
}

.navbar-container {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary);
    text-decoration: none;
}

.navbar-brand:hover {
    color: var(--primary-dark);
}

.navbar-logo {
    width: 40px;
    height: 40px;
}

.navbar-nav {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.navbar-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.navbar-link:hover {
    color: var(--primary);
    background: rgba(63, 81, 181, 0.1);
}

.navbar-link.active {
    color: var(--primary);
    background: rgba(63, 81, 181, 0.1);
}

/* ============================================
   9. USER MENU
   ============================================ */
.user-menu {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.user-avatar {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-full);
    background: var(--primary-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-weight: 700;
    font-size: 1rem;
    cursor: pointer;
    transition: transform var(--transition-bounce);
}

.user-avatar:hover {
    transform: scale(1.1);
}

.user-info {
    text-align: right;
}

.user-name {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.95rem;
}

.user-role {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

/* ============================================
   10. BADGES
   ============================================ */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 4px 12px;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: var(--radius-xl);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.badge-primary {
    background: rgba(63, 81, 181, 0.1);
    color: var(--primary);
}

.badge-success {
    background: rgba(76, 175, 80, 0.1);
    color: var(--success);
}

.badge-error {
    background: rgba(244, 67, 54, 0.1);
    color: var(--error);
}

.badge-warning {
    background: rgba(255, 152, 0, 0.1);
    color: var(--warning);
}

.badge-admin {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: var(--white);
}

.badge-teacher {
    background: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
    color: var(--white);
}

.badge-student {
    background: linear-gradient(135deg, #3F51B5 0%, #5C6BC0 100%);
    color: var(--white);
}

/* ============================================
   11. ALERTS
   ============================================ */
.alert {
    padding: var(--space-md) var(--space-lg);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-lg);
    display: flex;
    align-items: center;
    gap: var(--space-md);
    animation: slideIn var(--transition-normal);
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.alert-success {
    background: rgba(76, 175, 80, 0.1);
    border-left: 4px solid var(--success);
    color: #2E7D32;
}

.alert-error {
    background: rgba(244, 67, 54, 0.1);
    border-left: 4px solid var(--error);
    color: #C62828;
}

.alert-warning {
    background: rgba(255, 152, 0, 0.1);
    border-left: 4px solid var(--warning);
    color: #EF6C00;
}

.alert-info {
    background: rgba(33, 150, 243, 0.1);
    border-left: 4px solid var(--info);
    color: #1565C0;
}

/* ============================================
   12. CONTAINER & LAYOUT
   ============================================ */
.container {
    width: 100%;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

.container-sm { max-width: 640px; }
.container-md { max-width: 960px; }
.container-lg { max-width: 1200px; }

.page {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.main-content {
    flex: 1;
    padding: var(--space-2xl) 0;
}

/* Grid */
.grid {
    display: grid;
    gap: var(--space-lg);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 1024px) {
    .grid-4 { grid-template-columns: repeat(2, 1fr); }
    .grid-3 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    .grid-4, .grid-3, .grid-2 { grid-template-columns: 1fr; }
}

/* Flex utilities */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.items-end { align-items: flex-end; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-end { justify-content: flex-end; }
.gap-sm { gap: var(--space-sm); }
.gap-md { gap: var(--space-md); }
.gap-lg { gap: var(--space-lg); }

/* ============================================
   13. ANIMATIONS & EFFECTS
   ============================================ */

/* Fade In */
.fade-in {
    animation: fadeIn var(--transition-normal);
}

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

/* Slide Up */
.slide-up {
    animation: slideUp var(--transition-normal);
}

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

/* Scale In */
.scale-in {
    animation: scaleIn var(--transition-normal);
}

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

/* Bounce */
.bounce {
    animation: bounce 1s infinite;
}

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

/* Shake (for errors) */
.shake {
    animation: shake 0.5s ease-in-out;
}

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

/* Staggered children animation */
.stagger-children > * {
    opacity: 0;
    animation: slideUp var(--transition-normal) forwards;
}

.stagger-children > *:nth-child(1) { animation-delay: 0.1s; }
.stagger-children > *:nth-child(2) { animation-delay: 0.2s; }
.stagger-children > *:nth-child(3) { animation-delay: 0.3s; }
.stagger-children > *:nth-child(4) { animation-delay: 0.4s; }
.stagger-children > *:nth-child(5) { animation-delay: 0.5s; }

/* Hover lift */
.hover-lift {
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.hover-lift:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

/* Hover scale */
.hover-scale {
    transition: transform var(--transition-bounce);
}

.hover-scale:hover {
    transform: scale(1.05);
}

/* ============================================
   14. PROGRESS & LOADING
   ============================================ */
.progress {
    height: 8px;
    background: var(--gray-200);
    border-radius: var(--radius-xl);
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background: var(--primary-gradient);
    border-radius: var(--radius-xl);
    transition: width var(--transition-slow);
}

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

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

/* Spinner */
.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--gray-200);
    border-top-color: var(--primary);
    border-radius: var(--radius-full);
    animation: spin 0.8s linear infinite;
}

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

/* ============================================
   15. TOOLTIPS
   ============================================ */
.tooltip {
    position: relative;
}

.tooltip::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    padding: var(--space-sm) var(--space-md);
    background: var(--gray-900);
    color: var(--white);
    font-size: 0.75rem;
    border-radius: var(--radius-sm);
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-fast);
}

.tooltip:hover::after {
    opacity: 1;
    visibility: visible;
    bottom: calc(100% + 8px);
}

/* ============================================
   16. TABLES
   ============================================ */
.table-container {
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
}

.table {
    width: 100%;
    border-collapse: collapse;
}

.table th,
.table td {
    padding: var(--space-md) var(--space-lg);
    text-align: left;
}

.table th {
    background: var(--gray-50);
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.table tr {
    border-bottom: 1px solid var(--gray-200);
    transition: background var(--transition-fast);
}

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

.table tbody tr:last-child {
    border-bottom: none;
}

/* ============================================
   17. SIDEBAR
   ============================================ */
.sidebar {
    width: 280px;
    background: var(--white);
    border-right: 1px solid var(--gray-200);
    height: 100vh;
    position: fixed;
    top: 0;
    left: 0;
    padding: var(--space-lg);
    overflow-y: auto;
}

.sidebar-header {
    padding-bottom: var(--space-lg);
    border-bottom: 1px solid var(--gray-200);
    margin-bottom: var(--space-lg);
}

.sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.sidebar-link {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md);
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.sidebar-link:hover {
    background: rgba(63, 81, 181, 0.1);
    color: var(--primary);
}

.sidebar-link.active {
    background: var(--primary);
    color: var(--white);
}

.sidebar-link-icon {
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* ============================================
   18. UTILITIES
   ============================================ */

/* Spacing */
.m-0 { margin: 0; }
.m-sm { margin: var(--space-sm); }
.m-md { margin: var(--space-md); }
.m-lg { margin: var(--space-lg); }

.mt-0 { margin-top: 0; }
.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }
.mt-2xl { margin-top: var(--space-2xl); }

.mb-0 { margin-bottom: 0; }
.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.mb-xl { margin-bottom: var(--space-xl); }

.p-0 { padding: 0; }
.p-sm { padding: var(--space-sm); }
.p-md { padding: var(--space-md); }
.p-lg { padding: var(--space-lg); }
.p-xl { padding: var(--space-xl); }

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

.font-light { font-weight: 300; }
.font-normal { font-weight: 400; }
.font-medium { font-weight: 500; }
.font-semibold { font-weight: 600; }
.font-bold { font-weight: 700; }

.text-sm { font-size: 0.875rem; }
.text-base { font-size: 1rem; }
.text-lg { font-size: 1.125rem; }
.text-xl { font-size: 1.25rem; }
.text-2xl { font-size: 1.5rem; }
.text-3xl { font-size: 2rem; }

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

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

/* Rounded */
.rounded { border-radius: var(--radius-md); }
.rounded-lg { border-radius: var(--radius-lg); }
.rounded-xl { border-radius: var(--radius-xl); }
.rounded-full { border-radius: var(--radius-full); }

/* Shadow */
.shadow { box-shadow: var(--shadow-md); }
.shadow-lg { box-shadow: var(--shadow-lg); }
.shadow-none { box-shadow: none; }

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

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

/* ============================================
   19. RESPONSIVE
   ============================================ */
@media (max-width: 768px) {
    :root {
        --space-xl: 24px;
        --space-2xl: 32px;
    }

    h1 { font-size: 2rem; }
    h2 { font-size: 1.5rem; }

    .navbar {
        padding: var(--space-md);
    }

    .container {
        padding: 0 var(--space-md);
    }

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

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

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

/* ============================================
   20. DARK MODE (Optional - for future)
   ============================================ */
@media (prefers-color-scheme: dark) {
    /* Uncomment to enable dark mode
    :root {
        --bg-primary: #1A1A2E;
        --bg-secondary: #16213E;
        --text-primary: #FFFFFF;
        --text-secondary: #A0A0A0;
        --white: #1A1A2E;
        --gray-200: #2A2A4A;
    }
    */
}