/* ==========================================================================
   Variables CSS
   ========================================================================== */
:root {
    /* Colores principales */
    --primary-color: #3498db;
    --primary-dark: #2980b9;
    --primary-light: #5dade2;
    
    /* Colores secundarios */
    --secondary-color: #2c3e50;
    --secondary-dark: #1a252f;
    --secondary-light: #34495e;
    
    /* Colores de estado */
    --success-color: #27ae60;
    --success-dark: #219653;
    --warning-color: #f39c12;
    --warning-dark: #e67e22;
    --danger-color: #e74c3c;
    --danger-dark: #c0392b;
    --info-color: #00bcd4;
    --info-dark: #0097a7;
    
    /* Colores neutros */
    --light-color: #ecf0f1;
    --light-gray: #f8f9fa;
    --gray-color: #95a5a6;
    --dark-gray: #7f8c8d;
    --dark-color: #34495e;
    
    /* Colores de texto */
    --text-primary: #2c3e50;
    --text-secondary: #7f8c8d;
    --text-light: #ecf0f1;
    --text-muted: #95a5a6;
    
    /* Bordes y sombras */
    --border-color: #e9ecef;
    --border-radius: 8px;
    --box-shadow: 0 2px 15px rgba(0, 0, 0, 0.08);
    --box-shadow-hover: 0 5px 25px rgba(0, 0, 0, 0.15);
    
    /* Espaciado */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-xxl: 48px;
    
    /* Tipografía */
    --font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --font-size-xs: 12px;
    --font-size-sm: 14px;
    --font-size-md: 16px;
    --font-size-lg: 18px;
    --font-size-xl: 24px;
    --font-size-xxl: 32px;
    
    /* Transiciones */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* ==========================================================================
   Reset y estilos base
   ========================================================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-md);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: #f5f7fa;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

@media (min-width: 768px) {
    .container {
        padding: 0 var(--spacing-lg);
    }
}

/* ==========================================================================
   Tipografía
   ========================================================================== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: var(--spacing-md);
    color: var(--secondary-color);
}

h1 {
    font-size: var(--font-size-xxl);
    margin-bottom: var(--spacing-lg);
}

h2 {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-md);
}

h3 {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-sm);
}

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);
    text-decoration: underline;
}

.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-warning { color: var(--warning-color); }
.text-danger { color: var(--danger-color); }
.text-info { color: var(--info-color); }
.text-muted { color: var(--text-muted); }

/* ==========================================================================
   Layout
   ========================================================================== */
.main-header {
    background-color: var(--secondary-color);
    color: var(--text-light);
    padding: var(--spacing-md) 0;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.main-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-light);
    text-decoration: none;
}

.logo:hover {
    color: var(--text-light);
    text-decoration: none;
}

.logo i {
    font-size: var(--font-size-xl);
}

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

.main-nav a {
    color: var(--text-light);
    text-decoration: none;
    font-weight: 500;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius);
    transition: background-color var(--transition-normal);
}

.main-nav a:hover,
.main-nav a.active {
    background-color: rgba(255, 255, 255, 0.1);
    text-decoration: none;
}

.user-menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.user-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.user-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background-color: var(--primary-color);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
}

/* ==========================================================================
   Botones
   ========================================================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: 10px 20px;
    font-size: var(--font-size-md);
    font-weight: 500;
    line-height: 1.5;
    text-align: center;
    text-decoration: none;
    white-space: nowrap;
    vertical-align: middle;
    cursor: pointer;
    user-select: none;
    border: 2px solid transparent;
    border-radius: var(--border-radius);
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

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

.btn i {
    font-size: 1.1em;
}

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

.btn-primary:hover {
    background-color: var(--primary-dark);
    border-color: var(--primary-dark);
    color: white;
    text-decoration: none;
    transform: translateY(-2px);
    box-shadow: var(--box-shadow);
}

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

.btn-secondary:hover {
    background-color: var(--secondary-dark);
    border-color: var(--secondary-dark);
    color: white;
    text-decoration: none;
    transform: translateY(-2px);
}

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

.btn-success:hover {
    background-color: var(--success-dark);
    border-color: var(--success-dark);
    color: white;
    text-decoration: none;
    transform: translateY(-2px);
}

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

.btn-danger:hover {
    background-color: var(--danger-dark);
    border-color: var(--danger-dark);
    color: white;
    text-decoration: none;
    transform: translateY(-2px);
}

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

.btn-warning:hover {
    background-color: var(--warning-dark);
    border-color: var(--warning-dark);
    color: white;
    text-decoration: none;
    transform: translateY(-2px);
}

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

.btn-outline:hover {
    background-color: var(--primary-color);
    color: white;
    text-decoration: none;
}

.btn-sm {
    padding: 6px 12px;
    font-size: var(--font-size-sm);
}

.btn-lg {
    padding: 12px 30px;
    font-size: var(--font-size-lg);
}

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

.btn-group {
    display: flex;
    gap: var(--spacing-sm);
}

/* ==========================================================================
   Formularios
   ========================================================================== */
.form-container {
    background-color: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    padding: var(--spacing-xl);
    margin: var(--spacing-xl) 0;
}

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

.form-header h2 {
    color: var(--secondary-color);
}

.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-row {
    display: flex;
    flex-wrap: wrap;
    margin: 0 calc(var(--spacing-sm) * -1);
}

.form-col {
    flex: 1 0 0%;
    padding: 0 var(--spacing-sm);
    min-width: 250px;
}

label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
    color: var(--text-primary);
}

.form-control {
    display: block;
    width: 100%;
    padding: 10px 15px;
    font-size: var(--font-size-md);
    line-height: 1.5;
    color: var(--text-primary);
    background-color: white;
    background-clip: padding-box;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    transition: border-color var(--transition-normal),
                box-shadow var(--transition-normal);
}

.form-control:focus {
    outline: 0;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

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

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

select.form-control {
    appearance: none;
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3e%3cpath fill='none' stroke='%23343a40' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M2 5l6 6 6-6'/%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 15px center;
    background-size: 16px 12px;
    padding-right: 40px;
}

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

.form-check-input {
    width: 18px;
    height: 18px;
    margin: 0;
}

.form-check-label {
    margin-bottom: 0;
    cursor: pointer;
}

.form-text {
    display: block;
    margin-top: var(--spacing-xs);
    color: var(--text-muted);
    font-size: var(--font-size-sm);
}

/* ==========================================================================
   Tablas
   ========================================================================== */
.table-responsive {
    display: block;
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.table {
    width: 100%;
    margin-bottom: var(--spacing-lg);
    background-color: white;
    border-collapse: collapse;
    box-shadow: var(--box-shadow);
    border-radius: var(--border-radius);
    overflow: hidden;
}

.table th,
.table td {
    padding: 15px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.table th {
    background-color: var(--light-gray);
    font-weight: 600;
    color: var(--secondary-color);
    white-space: nowrap;
}

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

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

.table-striped tbody tr:nth-of-type(odd) {
    background-color: rgba(0, 0, 0, 0.02);
}

.table-bordered {
    border: 1px solid var(--border-color);
}

.table-bordered th,
.table-bordered td {
    border: 1px solid var(--border-color);
}

/* ==========================================================================
   Alertas
   ========================================================================== */
.alert {
    position: relative;
    padding: 15px 20px;
    margin-bottom: var(--spacing-lg);
    border: 1px solid transparent;
    border-radius: var(--border-radius);
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
}

.alert i {
    font-size: 1.2em;
    flex-shrink: 0;
}

.alert-content {
    flex: 1;
}

.alert-dismissible {
    padding-right: 50px;
}

.alert-dismissible .close {
    position: absolute;
    top: 0;
    right: 0;
    padding: 15px 20px;
    color: inherit;
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1.5em;
    line-height: 1;
}

.alert-success {
    background-color: #d4edda;
    border-color: #c3e6cb;
    color: #155724;
}

.alert-success i {
    color: var(--success-color);
}

.alert-danger {
    background-color: #f8d7da;
    border-color: #f5c6cb;
    color: #721c24;
}

.alert-danger i {
    color: var(--danger-color);
}

.alert-warning {
    background-color: #fff3cd;
    border-color: #ffeaa7;
    color: #856404;
}

.alert-warning i {
    color: var(--warning-color);
}

.alert-info {
    background-color: #e3f2fd;
    border-color: #bbdefb;
    color: #1565c0;
}

.alert-info i {
    color: var(--info-color);
}

/* ==========================================================================
   Tarjetas (Cards)
   ========================================================================== */
.card {
    background-color: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    overflow: hidden;
    transition: transform var(--transition-normal),
                box-shadow var(--transition-normal);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: var(--box-shadow-hover);
}

.card-header {
    padding: var(--spacing-lg);
    background-color: var(--light-gray);
    border-bottom: 1px solid var(--border-color);
}

.card-header h3 {
    margin-bottom: 0;
    color: var(--secondary-color);
}

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

.card-footer {
    padding: var(--spacing-lg);
    background-color: var(--light-gray);
    border-top: 1px solid var(--border-color);
    text-align: center;
}

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

.col {
    flex: 1 0 0%;
    padding: 0 var(--spacing-md);
    min-width: 250px;
}

.col-1 { flex: 0 0 8.33333%; max-width: 8.33333%; }
.col-2 { flex: 0 0 16.66667%; max-width: 16.66667%; }
.col-3 { flex: 0 0 25%; max-width: 25%; }
.col-4 { flex: 0 0 33.33333%; max-width: 33.33333%; }
.col-5 { flex: 0 0 41.66667%; max-width: 41.66667%; }
.col-6 { flex: 0 0 50%; max-width: 50%; }
.col-7 { flex: 0 0 58.33333%; max-width: 58.33333%; }
.col-8 { flex: 0 0 66.66667%; max-width: 66.66667%; }
.col-9 { flex: 0 0 75%; max-width: 75%; }
.col-10 { flex: 0 0 83.33333%; max-width: 83.33333%; }
.col-11 { flex: 0 0 91.66667%; max-width: 91.66667%; }
.col-12 { flex: 0 0 100%; max-width: 100%; }

/* ==========================================================================
   Dashboard
   ========================================================================== */
.dashboard-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-lg);
    border-bottom: 2px solid var(--border-color);
}

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

.stat-card {
    background: white;
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    box-shadow: var(--box-shadow);
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    transition: all var(--transition-normal);
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--box-shadow-hover);
}

.stat-card-icon {
    width: 60px;
    height: 60px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    color: white;
}

.stat-card-icon.primary { background: linear-gradient(135deg, var(--primary-color), var(--primary-dark)); }
.stat-card-icon.success { background: linear-gradient(135deg, var(--success-color), var(--success-dark)); }
.stat-card-icon.warning { background: linear-gradient(135deg, var(--warning-color), var(--warning-dark)); }
.stat-card-icon.info { background: linear-gradient(135deg, var(--info-color), var(--info-dark)); }

.stat-card-content {
    flex: 1;
}

.stat-card-title {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
    margin-bottom: var(--spacing-xs);
}

.stat-card-number {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.stat-card-change {
    font-size: var(--font-size-sm);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.stat-card-change.positive { color: var(--success-color); }
.stat-card-change.negative { color: var(--danger-color); }

/* ==========================================================================
   Paginación
   ========================================================================== */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-sm);
    margin: var(--spacing-xl) 0;
    padding: var(--spacing-lg);
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

.page-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--border-radius);
    background-color: var(--light-gray);
    color: var(--text-primary);
    text-decoration: none;
    transition: all var(--transition-normal);
}

.page-link:hover {
    background-color: var(--primary-color);
    color: white;
    text-decoration: none;
}

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

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

/* ==========================================================================
   Badges
   ========================================================================== */
.badge {
    display: inline-block;
    padding: 4px 10px;
    font-size: var(--font-size-xs);
    font-weight: 600;
    line-height: 1;
    text-align: center;
    white-space: nowrap;
    vertical-align: baseline;
    border-radius: 20px;
}

.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;
}

/* ==========================================================================
   Progress bars
   ========================================================================== */
.progress {
    height: 10px;
    background-color: var(--light-gray);
    border-radius: 5px;
    overflow: hidden;
    margin-bottom: var(--spacing-md);
}

.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-light));
    border-radius: 5px;
    transition: width 0.6s ease;
}

.progress-bar.success { background: linear-gradient(90deg, var(--success-color), var(--success-dark)); }
.progress-bar.warning { background: linear-gradient(90deg, var(--warning-color), var(--warning-dark)); }
.progress-bar.danger { background: linear-gradient(90deg, var(--danger-color), var(--danger-dark)); }

/* ==========================================================================
   Modales
   ========================================================================== */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 1050;
    overflow-y: auto;
}

.modal.show {
    display: block;
}

.modal-dialog {
    max-width: 500px;
    margin: 30px auto;
    position: relative;
}

.modal-content {
    background-color: white;
    border-radius: var(--border-radius);
    box-shadow: 0 5px 25px rgba(0, 0, 0, 0.2);
    overflow: hidden;
}

.modal-header {
    padding: var(--spacing-lg);
    background-color: var(--light-gray);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    margin-bottom: 0;
    color: var(--secondary-color);
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5em;
    cursor: pointer;
    color: var(--text-muted);
    transition: color var(--transition-fast);
}

.modal-close:hover {
    color: var(--danger-color);
}

.modal-body {
    padding: var(--spacing-lg);
}

.modal-footer {
    padding: var(--spacing-lg);
    background-color: var(--light-gray);
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-sm);
}

/* ==========================================================================
   Sidebar
   ========================================================================== */
.sidebar {
    width: 250px;
    background-color: var(--secondary-color);
    color: var(--text-light);
    height: 100vh;
    position: fixed;
    top: 0;
    left: 0;
    z-index: 100;
    transition: transform var(--transition-normal);
}

.sidebar-header {
    padding: var(--spacing-lg);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.sidebar-menu {
    padding: var(--spacing-md) 0;
}

.sidebar-menu ul {
    list-style: none;
}

.sidebar-menu li {
    margin-bottom: var(--spacing-xs);
}

.sidebar-menu a {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: 12px 20px;
    color: var(--text-light);
    text-decoration: none;
    transition: background-color var(--transition-normal);
}

.sidebar-menu a:hover,
.sidebar-menu a.active {
    background-color: rgba(255, 255, 255, 0.1);
    text-decoration: none;
}

.sidebar-menu i {
    width: 20px;
    text-align: center;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.main-footer {
    background-color: var(--secondary-color);
    color: var(--text-light);
    padding: var(--spacing-xl) 0;
    margin-top: auto;
}

.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 {
    color: var(--text-light);
    margin-bottom: var(--spacing-lg);
}

.footer-section ul {
    list-style: none;
}

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

.footer-section a {
    color: var(--text-light);
    opacity: 0.8;
    transition: opacity var(--transition-fast);
}

.footer-section a:hover {
    opacity: 1;
    text-decoration: none;
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--text-light);
    opacity: 0.8;
}

/* ==========================================================================
   Páginas de autenticación
   ========================================================================== */
.auth-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    padding: var(--spacing-md);
}

.auth-container {
    width: 100%;
    max-width: 400px;
}

.auth-card {
    background-color: white;
    border-radius: var(--border-radius);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    overflow: hidden;
}

.auth-header {
    text-align: center;
    padding: var(--spacing-xl);
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
}

.auth-header h1 {
    color: white;
    margin-bottom: var(--spacing-sm);
}

.auth-body {
    padding: var(--spacing-xl);
}

.auth-footer {
    text-align: center;
    padding: var(--spacing-lg);
    background-color: var(--light-gray);
    border-top: 1px solid var(--border-color);
}

/* ==========================================================================
   Página de inicio
   ========================================================================== */
.hero-section {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--text-light);
    padding: var(--spacing-xxl) 0;
    text-align: center;
}

.hero-content h1 {
    color: var(--text-light);
    font-size: 2.5em;
    margin-bottom: var(--spacing-lg);
}

.hero-content p {
    font-size: 1.2em;
    opacity: 0.9;
    margin-bottom: var(--spacing-xl);
}

.features-section {
    padding: var(--spacing-xxl) 0;
    background-color: white;
}

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

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
}

.feature-card {
    text-align: center;
    padding: var(--spacing-xl);
    border-radius: var(--border-radius);
    background-color: var(--light-gray);
    transition: transform var(--transition-normal);
}

.feature-card:hover {
    transform: translateY(-10px);
}

.feature-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-lg);
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
    color: white;
}

/* ==========================================================================
   Responsive Design
   ========================================================================== */
@media (max-width: 768px) {
    /* Header responsive */
    .main-header .container {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .main-nav ul {
        flex-direction: column;
        gap: var(--spacing-sm);
        width: 100%;
    }
    
    .main-nav a {
        display: block;
        width: 100%;
        text-align: center;
    }
    
    /* Dashboard responsive */
    .dashboard-header {
        flex-direction: column;
        gap: var(--spacing-md);
        align-items: flex-start;
    }
    
    .dashboard-cards {
        grid-template-columns: 1fr;
    }
    
    /* Sidebar responsive */
    .sidebar {
        transform: translateX(-100%);
    }
    
    .sidebar.show {
        transform: translateX(0);
    }
    
    /* Tables responsive */
    .table-responsive {
        font-size: var(--font-size-sm);
    }
    
    .table th,
    .table td {
        padding: 10px;
    }
    
    /* Forms responsive */
    .form-row {
        flex-direction: column;
    }
    
    .form-col {
        width: 100%;
        margin-bottom: var(--spacing-md);
    }
    
    /* Grid responsive */
    .row {
        flex-direction: column;
    }
    
    .col {
        width: 100%;
        margin-bottom: var(--spacing-md);
    }
    
    /* Modal responsive */
    .modal-dialog {
        margin: 10px;
    }
}

@media (max-width: 480px) {
    /* Ajustes para móviles pequeños */
    h1 { font-size: 1.8em; }
    h2 { font-size: 1.5em; }
    h3 { font-size: 1.2em; }
    
    .btn {
        padding: 8px 16px;
        font-size: var(--font-size-sm);
    }
    
    .form-container {
        padding: var(--spacing-lg);
    }
    
    .stat-card {
        flex-direction: column;
        text-align: center;
        gap: var(--spacing-md);
    }
    
    .pagination {
        flex-wrap: wrap;
    }
}

/* ==========================================================================
   Utilidades
   ========================================================================== */
.mt-0 { margin-top: 0 !important; }
.mt-1 { margin-top: var(--spacing-xs) !important; }
.mt-2 { margin-top: var(--spacing-sm) !important; }
.mt-3 { margin-top: var(--spacing-md) !important; }
.mt-4 { margin-top: var(--spacing-lg) !important; }
.mt-5 { margin-top: var(--spacing-xl) !important; }

.mb-0 { margin-bottom: 0 !important; }
.mb-1 { margin-bottom: var(--spacing-xs) !important; }
.mb-2 { margin-bottom: var(--spacing-sm) !important; }
.mb-3 { margin-bottom: var(--spacing-md) !important; }
.mb-4 { margin-bottom: var(--spacing-lg) !important; }
.mb-5 { margin-bottom: var(--spacing-xl) !important; }

.ml-0 { margin-left: 0 !important; }
.ml-1 { margin-left: var(--spacing-xs) !important; }
.ml-2 { margin-left: var(--spacing-sm) !important; }
.ml-3 { margin-left: var(--spacing-md) !important; }
.ml-4 { margin-left: var(--spacing-lg) !important; }
.ml-5 { margin-left: var(--spacing-xl) !important; }

.mr-0 { margin-right: 0 !important; }
.mr-1 { margin-right: var(--spacing-xs) !important; }
.mr-2 { margin-right: var(--spacing-sm) !important; }
.mr-3 { margin-right: var(--spacing-md) !important; }
.mr-4 { margin-right: var(--spacing-lg) !important; }
.mr-5 { margin-right: var(--spacing-xl) !important; }

.p-0 { padding: 0 !important; }
.p-1 { padding: var(--spacing-xs) !important; }
.p-2 { padding: var(--spacing-sm) !important; }
.p-3 { padding: var(--spacing-md) !important; }
.p-4 { padding: var(--spacing-lg) !important; }
.p-5 { padding: var(--spacing-xl) !important; }

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

.flex-column { flex-direction: column !important; }
.flex-row { flex-direction: row !important; }
.justify-start { justify-content: flex-start !important; }
.justify-center { justify-content: center !important; }
.justify-end { justify-content: flex-end !important; }
.justify-between { justify-content: space-between !important; }
.align-start { align-items: flex-start !important; }
.align-center { align-items: center !important; }
.align-end { align-items: flex-end !important; }

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

.rounded { border-radius: var(--border-radius) !important; }
.rounded-circle { border-radius: 50% !important; }

.shadow-sm { box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1) !important; }
.shadow { box-shadow: var(--box-shadow) !important; }
.shadow-lg { box-shadow: var(--box-shadow-hover) !important; }

/* ==========================================================================
   Animaciones
   ========================================================================== */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

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

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

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.animate-fade-in {
    animation: fadeIn 0.5s ease;
}

.animate-slide-up {
    animation: slideInUp 0.5s ease;
}

.animate-slide-down {
    animation: slideInDown 0.5s ease;
}

.animate-pulse {
    animation: pulse 2s infinite;
}

.animate-spin {
    animation: spin 1s linear infinite;
}

/* ==========================================================================
   Estados de carga
   ========================================================================== */
.loading {
    position: relative;
    pointer-events: none;
    opacity: 0.7;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

/* ==========================================================================
   Custom Scrollbar
   ========================================================================== */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--light-gray);
}

::-webkit-scrollbar-thumb {
    background: var(--gray-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--dark-gray);
}

/* ==========================================================================
   Print Styles
   ========================================================================== */
@media print {
    .no-print {
        display: none !important;
    }
    
    .main-header,
    .main-footer,
    .sidebar {
        display: none !important;
    }
    
    body {
        background: white !important;
        color: black !important;
    }
    
    .container {
        width: 100% !important;
        max-width: none !important;
        padding: 0 !important;
    }
    
    .table {
        box-shadow: none !important;
        border: 1px solid #ddd !important;
    }
    
    .btn {
        display: none !important;
    }
}

/* ==========================================================================
   Dark Mode (Opcional)
   ========================================================================== */
.dark-mode {
    --text-primary: #ecf0f1;
    --text-secondary: #bdc3c7;
    --light-color: #2c3e50;
    --light-gray: #34495e;
    --border-color: #4a6572;
    --secondary-color: #1a252f;
    
    background-color: #2c3e50;
    color: var(--text-primary);
}

.dark-mode .card,
.dark-mode .table,
.dark-mode .form-container {
    background-color: var(--light-gray);
    border-color: var(--border-color);
}

.dark-mode .table th {
    background-color: var(--secondary-color);
}

.dark-mode .modal-content {
    background-color: var(--light-gray);
}

.dark-mode .form-control {
    background-color: var(--secondary-color);
    border-color: var(--border-color);
    color: var(--text-primary);
}