/**
 * PROMOTE Platform - Main Stylesheet
 * Main styles for public pages
 */

/* ============================================================================
   VARIABLES & RESET
   ========================================================================= */
:root {
    /* Colors */
    --primary-color: #3498db;
    --primary-dark: #2980b9;
    --primary-light: #5dade2;
    --secondary-color: #2c3e50;
    --secondary-dark: #1a252f;
    --success-color: #27ae60;
    --success-dark: #229954;
    --warning-color: #f39c12;
    --warning-dark: #e67e22;
    --danger-color: #e74c3c;
    --danger-dark: #c0392b;
    --info-color: #3498db;
    
    /* Grays */
    --gray-100: #f8f9fa;
    --gray-200: #e9ecef;
    --gray-300: #dee2e6;
    --gray-400: #ced4da;
    --gray-500: #adb5bd;
    --gray-600: #6c757d;
    --gray-700: #495057;
    --gray-800: #343a40;
    --gray-900: #212529;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-size-base: 16px;
    --line-height-base: 1.6;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-xxl: 3rem;
    --spacing-xxxl: 4rem;
    
    /* Border */
    --border-radius: 8px;
    --border-radius-sm: 4px;
    --border-radius-lg: 12px;
    --border-color: var(--gray-300);
    
    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --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);
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Z-index */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal-backdrop: 1040;
    --z-modal: 1050;
    --z-popover: 1060;
    --z-tooltip: 1070;
}

/* Reset */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

html {
    font-size: var(--font-size-base);
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family);
    line-height: var(--line-height-base);
    color: var(--gray-900);
    background-color: var(--gray-100);
    overflow-x: hidden;
}

body.menu-open {
    overflow: hidden;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* ============================================================================
   TYPOGRAPHY
   ========================================================================= */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    color: var(--secondary-color);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.75rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1rem; }

p {
    margin-bottom: var(--spacing-md);
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--primary-dark);
}

strong, b {
    font-weight: 600;
}

/* ============================================================================
   LAYOUT
   ========================================================================= */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    width: 100%;
}

.container-fluid {
    width: 100%;
    padding: 0 var(--spacing-lg);
}

.main-content {
    min-height: calc(100vh - 200px);
}

/* ============================================================================
   HEADER
   ========================================================================= */
.site-header {
    background-color: white;
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
    transition: box-shadow var(--transition-base);
}

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

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) 0;
}

/* Logo */
.logo a {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.logo img {
    height: 40px;
    width: auto;
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Navigation */
.main-nav {
    display: flex;
    align-items: center;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-sm);
    align-items: center;
}

.nav-menu > li {
    position: relative;
}

.nav-menu a {
    color: var(--gray-700);
    font-weight: 500;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius);
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--primary-color);
    background-color: var(--gray-100);
}

/* Dropdown */
.dropdown {
    position: relative;
}

.dropdown-toggle {
    cursor: pointer;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    right: 0;
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    min-width: 200px;
    padding: var(--spacing-sm) 0;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-base);
    z-index: var(--z-dropdown);
    list-style: none;
}

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

.dropdown-menu li {
    margin: 0;
}

.dropdown-menu a {
    padding: var(--spacing-sm) var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--gray-700);
    border-radius: 0;
}

.dropdown-menu a:hover {
    background-color: var(--gray-100);
    color: var(--primary-color);
}

.dropdown-menu .divider {
    height: 1px;
    background-color: var(--border-color);
    margin: var(--spacing-sm) 0;
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
    flex-direction: column;
    gap: 4px;
}

.mobile-menu-toggle span {
    display: block;
    width: 25px;
    height: 3px;
    background-color: var(--gray-800);
    transition: all var(--transition-base);
    border-radius: 2px;
}

.mobile-menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
}

.mobile-menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
}

/* ============================================================================
   FOOTER
   ========================================================================= */
.site-footer {
    background-color: var(--secondary-color);
    color: white;
    padding: var(--spacing-xxl) 0 var(--spacing-lg);
    margin-top: var(--spacing-xxl);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-section h3,
.footer-section h4 {
    color: white;
    margin-bottom: var(--spacing-md);
    font-size: 1.125rem;
}

.footer-section p {
    color: var(--gray-300);
    line-height: 1.6;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: var(--spacing-sm);
}

.footer-links a {
    color: var(--gray-300);
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: white;
}

.footer-contact {
    list-style: none;
}

.footer-contact li {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
    color: var(--gray-300);
}

.footer-contact i {
    margin-top: 2px;
    color: var(--primary-light);
}

.footer-contact a {
    color: var(--gray-300);
}

.footer-contact a:hover {
    color: white;
}

/* Social Links */
.social-links {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

.social-links a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    color: white;
    transition: all var(--transition-fast);
}

.social-links a:hover {
    background-color: var(--primary-color);
    transform: translateY(-2px);
}

/* Footer Bottom */
.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.footer-bottom-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.footer-bottom p {
    color: var(--gray-400);
    margin: 0;
}

.footer-legal {
    display: flex;
    gap: var(--spacing-md);
    list-style: none;
    flex-wrap: wrap;
}

.footer-legal a {
    color: var(--gray-400);
    font-size: 0.875rem;
}

.footer-legal a:hover {
    color: white;
}

.footer-credit {
    text-align: center;
    color: var(--gray-500);
    font-size: 0.875rem;
}

/* ============================================================================
   BACK TO TOP BUTTON
   ========================================================================= */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition-base);
    z-index: var(--z-fixed);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    background-color: var(--primary-dark);
    transform: translateY(-5px);
}

/* ============================================================================
   BUTTONS
   ========================================================================= */
.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: 1rem;
    font-weight: 500;
    text-align: center;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
    line-height: 1.5;
    position: relative;
    overflow: hidden;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn.loading {
    color: transparent;
    pointer-events: none;
}

.btn.loading::after {
    content: '';
    position: absolute;
    width: 16px;
    height: 16px;
    top: 50%;
    left: 50%;
    margin-left: -8px;
    margin-top: -8px;
    border: 2px solid transparent;
    border-top-color: currentColor;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

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

.btn-primary:hover:not(:disabled) {
    background-color: var(--primary-dark);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background-color: var(--gray-600);
    color: white;
}

.btn-secondary:hover:not(:disabled) {
    background-color: var(--gray-700);
    color: white;
}

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

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

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

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

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

.btn-warning:hover:not(:disabled) {
    background-color: var(--warning-dark);
    color: white;
}

.btn-outline {
    background-color: transparent;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
}

.btn-outline:hover:not(:disabled) {
    background-color: var(--primary-color);
    color: white;
}

.btn-sm {
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: 0.875rem;
}

.btn-lg {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1.125rem;
}

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

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

label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
    color: var(--gray-700);
}

.required {
    color: var(--danger-color);
    margin-left: 2px;
}

.form-control {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 1rem;
    font-family: inherit;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    transition: all var(--transition-fast);
    background-color: white;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

.form-control.error {
    border-color: var(--danger-color);
}

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

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

select.form-control {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23333' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 36px;
}

.form-text {
    display: block;
    margin-top: var(--spacing-xs);
    font-size: 0.875rem;
    color: var(--gray-600);
}

.error-message {
    display: block;
    margin-top: var(--spacing-xs);
    font-size: 0.875rem;
    color: var(--danger-color);
}

/* Checkbox and Radio */
.form-check {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.form-check input[type="checkbox"],
.form-check input[type="radio"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
}

.form-check label {
    margin: 0;
    cursor: pointer;
    font-weight: 400;
}

/* ============================================================================
   ALERTS & FLASH MESSAGES
   ========================================================================= */
.flash-messages {
    position: fixed;
    top: 80px;
    right: 20px;
    z-index: var(--z-tooltip);
    max-width: 400px;
}

.alert {
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    box-shadow: var(--shadow-lg);
    animation: slideIn 0.3s ease;
    position: relative;
    transition: opacity var(--transition-base);
}

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

.alert i {
    font-size: 1.25rem;
    flex-shrink: 0;
}

.alert-close {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    background: none;
    border: none;
    font-size: 1.5rem;
    line-height: 1;
    cursor: pointer;
    opacity: 0.5;
    transition: opacity var(--transition-fast);
    padding: 0;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.alert-close:hover {
    opacity: 1;
}

.alert-success {
    background-color: #d4edda;
    color: #155724;
    border-left: 4px solid var(--success-color);
}

.alert-error,
.alert-danger {
    background-color: #f8d7da;
    color: #721c24;
    border-left: 4px solid var(--danger-color);
}

.alert-warning {
    background-color: #fff3cd;
    color: #856404;
    border-left: 4px solid var(--warning-color);
}

.alert-info {
    background-color: #d1ecf1;
    color: #0c5460;
    border-left: 4px solid var(--info-color);
}

/* ============================================================================
   CARDS
   ========================================================================= */
.card {
    background-color: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    transition: box-shadow var(--transition-base);
}

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

.card-header {
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
}

.card-header h2,
.card-header h3 {
    margin-bottom: 0;
}

.card-body {
    padding: var(--spacing-md) 0;
}

.card-footer {
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-color);
}

/* ============================================================================
   TABLES
   ========================================================================= */
.table-container {
    background-color: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    margin-bottom: var(--spacing-lg);
}

.table-responsive {
    overflow-x: auto;
}

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

th, td {
    padding: var(--spacing-md);
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

th {
    background-color: var(--gray-100);
    font-weight: 600;
    color: var(--gray-700);
    white-space: nowrap;
}

tbody tr {
    transition: background-color var(--transition-fast);
}

tbody tr:hover {
    background-color: var(--gray-100);
}

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

/* ============================================================================
   BADGES
   ========================================================================= */
.badge {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.badge-primary { background-color: var(--primary-color); color: white; }
.badge-success { background-color: var(--success-color); color: white; }
.badge-warning { background-color: var(--warning-color); color: white; }
.badge-danger { background-color: var(--danger-color); color: white; }
.badge-info { background-color: var(--info-color); color: white; }
.badge-secondary { background-color: var(--gray-600); color: white; }

/* ============================================================================
   STATUS BADGES
   ========================================================================= */
.status-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    font-size: 0.875rem;
    font-weight: 500;
}

.status-badge::before {
    content: '';
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: currentColor;
}

.status-pending_payment { background-color: #fff3cd; color: #856404; }
.status-awaiting_approval { background-color: #fff3cd; color: #856404; }
.status-approved { background-color: #d1ecf1; color: #0c5460; }
.status-processing { background-color: #d1ecf1; color: #0c5460; }
.status-in_progress { background-color: #d1ecf1; color: #0c5460; }
.status-completed { background-color: #d4edda; color: #155724; }
.status-cancelled { background-color: #f8d7da; color: #721c24; }
.status-refunded { background-color: #f8d7da; color: #721c24; }
.status-active { background-color: #d4edda; color: #155724; }
.status-inactive { background-color: #e2e3e5; color: #383d41; }
.status-suspended { background-color: #f8d7da; color: #721c24; }

/* ============================================================================
   PAGINATION
   ========================================================================= */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-lg);
    padding: var(--spacing-lg) 0;
    flex-wrap: wrap;
}

.page-link {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    color: var(--gray-700);
    transition: all var(--transition-fast);
    min-width: 40px;
    text-align: center;
}

.page-link:hover:not(.disabled) {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

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

.page-link.disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* ============================================================================
   HERO SECTION
   ========================================================================= */
.hero {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    padding: var(--spacing-xxxl) 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    opacity: 0.1;
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero-content h1 {
    font-size: 3rem;
    margin-bottom: var(--spacing-lg);
    color: white;
    font-weight: 700;
}

.hero-content p {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-xl);
    color: rgba(255, 255, 255, 0.9);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-actions {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

/* ============================================================================
   SECTIONS
   ========================================================================= */
.section {
    padding: var(--spacing-xxl) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.section-header h2 {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
}

.section-header p {
    font-size: 1.125rem;
    color: var(--gray-600);
    max-width: 700px;
    margin: 0 auto;
}

/* ============================================================================
   GRID SYSTEM
   ========================================================================= */
.row {
    display: flex;
    flex-wrap: wrap;
    margin: 0 calc(var(--spacing-md) * -1);
}

.col,
.col-md-3,
.col-md-4,
.col-md-6,
.col-md-8,
.col-md-9,
.col-md-12 {
    padding: 0 var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.col-md-3 { flex: 0 0 25%; max-width: 25%; }
.col-md-4 { flex: 0 0 33.333333%; max-width: 33.333333%; }
.col-md-6 { flex: 0 0 50%; max-width: 50%; }
.col-md-8 { flex: 0 0 66.666667%; max-width: 66.666667%; }
.col-md-9 { flex: 0 0 75%; max-width: 75%; }
.col-md-12 { flex: 0 0 100%; max-width: 100%; }

/* ============================================================================
   EMPTY STATE
   ========================================================================= */
.empty-state {
    text-align: center;
    padding: var(--spacing-xxxl) var(--spacing-lg);
    color: var(--gray-600);
}

.empty-state i {
    font-size: 4rem;
    color: var(--gray-400);
    margin-bottom: var(--spacing-md);
}

.empty-state h3 {
    color: var(--gray-700);
    margin-bottom: var(--spacing-sm);
}

.empty-state p {
    color: var(--gray-600);
    margin-bottom: var(--spacing-lg);
}

/* ============================================================================
   LOADING SPINNER
   ========================================================================= */
.spinner {
    border: 3px solid var(--gray-300);
    border-top: 3px solid var(--primary-color);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: var(--spacing-lg) auto;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: var(--z-modal);
}

/* ============================================================================
   TOOLTIP
   ========================================================================= */
.tooltip {
    position: absolute;
    background-color: var(--gray-900);
    color: white;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius-sm);
    font-size: 0.875rem;
    white-space: nowrap;
    z-index: var(--z-tooltip);
    pointer-events: none;
}

.tooltip::after {
    content: '';
    position: absolute;
    top: 100%;
    left: 50%;
    margin-left: -5px;
    border: 5px solid transparent;
    border-top-color: var(--gray-900);
}

/* ============================================================================
   UTILITY CLASSES
   ========================================================================= */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-left { text-align: left; }

.text-primary { color: var(--primary-color); }
.text-success { color: var(--success-color); }
.text-danger { color: var(--danger-color); }
.text-warning { color: var(--warning-color); }
.text-muted { color: var(--gray-600); }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mt-3 { margin-top: var(--spacing-lg); }
.mt-4 { margin-top: var(--spacing-xl); }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }
.mb-3 { margin-bottom: var(--spacing-lg); }
.mb-4 { margin-bottom: var(--spacing-xl); }

.p-0 { padding: 0; }
.p-1 { padding: var(--spacing-sm); }
.p-2 { padding: var(--spacing-md); }
.p-3 { padding: var(--spacing-lg); }
.p-4 { padding: var(--spacing-xl); }

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

.flex-column { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.justify-content-center { justify-content: center; }
.justify-content-between { justify-content: space-between; }
.align-items-center { align-items: center; }
.gap-1 { gap: var(--spacing-sm); }
.gap-2 { gap: var(--spacing-md); }
.gap-3 { gap: var(--spacing-lg); }

/* ============================================================================
   RESPONSIVE
   ========================================================================= */
@media (max-width: 992px) {
    .col-md-3,
    .col-md-4,
    .col-md-6,
    .col-md-8,
    .col-md-9 {
        flex: 0 0 50%;
        max-width: 50%;
    }
}

@media (max-width: 768px) {
    /* Typography */
    h1 { font-size: 2rem; }
    h2 { font-size: 1.75rem; }
    h3 { font-size: 1.5rem; }
    
    /* Header */
    .mobile-menu-toggle {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: var(--spacing-lg);
        box-shadow: var(--shadow-lg);
        max-height: calc(100vh - 70px);
        overflow-y: auto;
        transform: translateX(-100%);
        transition: transform var(--transition-base);
    }
    
    .nav-menu.active {
        transform: translateX(0);
    }
    
    .dropdown-menu {
        position: static;
        box-shadow: none;
        background: var(--gray-100);
        margin-top: var(--spacing-sm);
    }
    
    /* Grid */
    .col-md-3,
    .col-md-4,
    .col-md-6,
    .col-md-8,
    .col-md-9,
    .col-md-12 {
        flex: 0 0 100%;
        max-width: 100%;
    }
    
    /* Hero */
    .hero-content h1 {
        font-size: 2rem;
    }
    
    .hero-actions {
        flex-direction: column;
    }
    
    /* Footer */
    .footer-bottom-content {
        flex-direction: column;
        text-align: center;
    }
    
    .footer-legal {
        justify-content: center;
    }
    
    /* Flash messages */
    .flash-messages {
        left: 20px;
        right: 20px;
        max-width: none;
    }
    
    /* Back to top */
    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 45px;
        height: 45px;
    }
    
    /* Tables */
    .table-responsive {
        overflow-x: scroll;
    }
    
    th, td {
        padding: var(--spacing-sm);
        font-size: 0.875rem;
    }
}

@media (max-width: 480px) {
    :root {
        --font-size-base: 14px;
    }
    
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .btn {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: 0.875rem;
    }
}

/* ============================================================================
   PRINT STYLES
   ========================================================================= */
@media print {
    .site-header,
    .site-footer,
    .back-to-top,
    .mobile-menu-toggle,
    .btn,
    .flash-messages {
        display: none !important;
    }
    
    body {
        background: white;
        color: black;
    }
    
    .card {
        box-shadow: none;
        border: 1px solid #ddd;
    }
}