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

:root {
    --primary-color: #3498db;
    --secondary-color: #2c3e50;
    --success-color: #27ae60;
    --danger-color: #e74c3c;
    --warning-color: #f39c12;
    --info-color: #16a085;
    --light-gray: #ecf0f1;
    --dark-gray: #7f8c8d;
    --white: #ffffff;
    --border-radius: 8px;
    --box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--secondary-color);
    background: #f5f7fa;
}

/* Navbar */
.navbar {
    background: var(--white);
    box-shadow: var(--box-shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand a {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
    text-decoration: none;
}

.nav-menu {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.nav-menu a {
    color: var(--secondary-color);
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    transition: all 0.3s;
}

.nav-menu a:hover {
    background: var(--light-gray);
}

.user-info {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

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

/* Main Content */
.main-content {
    min-height: calc(100vh - 120px);
    padding: 2rem 0;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* Page Header */
.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.page-header h1 {
    color: var(--secondary-color);
    font-size: 2rem;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.3s;
    text-align: center;
}

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

.btn-primary:hover {
    background: #2980b9;
    transform: translateY(-2px);
}

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

.btn-secondary:hover {
    background: #6c7a89;
}

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

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

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

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

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

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

/* Badges */
.badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    font-size: 0.875rem;
    font-weight: 500;
    background: var(--light-gray);
    color: var(--secondary-color);
}

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

.badge-secondary {
    background: var(--dark-gray);
    color: var(--white);
}

/* Cards */
.course-card, .module-card, .content-card, .stat-card, .section-card {
    background: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    overflow: hidden;
    transition: transform 0.3s;
}

.course-card:hover, .module-card:hover, .content-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 20px rgba(0,0,0,0.15);
}

/* Dashboard Grid */
.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.5rem;
}

.stat-icon {
    font-size: 3rem;
}

.stat-info h3 {
    font-size: 2rem;
    color: var(--primary-color);
}

.stat-info p {
    color: var(--dark-gray);
}

/* Section Grid */
.section-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
    gap: 1.5rem;
}

.section-card {
    padding: 0;
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem;
    border-bottom: 1px solid var(--light-gray);
}

.card-header h2 {
    font-size: 1.25rem;
    color: var(--secondary-color);
}

.card-body {
    padding: 1.5rem;
}

/* Courses Grid */
.courses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

.course-card {
    display: flex;
    flex-direction: column;
}

.course-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--light-gray);
}

.course-header h3 {
    margin-bottom: 0.5rem;
    color: var(--secondary-color);
}

.course-body {
    padding: 1.5rem;
    flex-grow: 1;
}

.course-footer {
    padding: 1.5rem;
    border-top: 1px solid var(--light-gray);
}

/* Modules List */
.modules-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.module-card {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    padding: 1.5rem;
}

.module-number {
    font-size: 2rem;
    font-weight: bold;
    color: var(--primary-color);
    min-width: 60px;
    text-align: center;
}

.module-content {
    flex-grow: 1;
}

.module-content h3 {
    margin-bottom: 0.5rem;
    color: var(--secondary-color);
}

/* Contents List */
.contents-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.content-card {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    padding: 1.5rem;
}

.content-icon {
    font-size: 2.5rem;
}

.content-info {
    flex-grow: 1;
}

.content-info h3 {
    margin-bottom: 0.5rem;
    color: var(--secondary-color);
}

.content-type {
    color: var(--dark-gray);
    font-size: 0.875rem;
}

/* Content Viewer */
.content-viewer {
    background: var(--white);
    padding: 2rem;
    border-radius: var(--border-radius);
    margin-bottom: 2rem;
    box-shadow: var(--box-shadow);
}

.video-container {
    position: relative;
    padding-bottom: 56.25%;
    height: 0;
    overflow: hidden;
}

.video-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.image-container {
    text-align: center;
}

.image-container img {
    max-width: 100%;
    height: auto;
    border-radius: var(--border-radius);
}

.text-content {
    line-height: 1.8;
}

.text-content h1, .text-content h2, .text-content h3 {
    margin-top: 1.5rem;
    margin-bottom: 1rem;
}

.text-content p {
    margin-bottom: 1rem;
}

.text-content code {
    background: var(--light-gray);
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    font-family: 'Courier New', monospace;
}

.text-content pre {
    background: var(--secondary-color);
    color: var(--white);
    padding: 1rem;
    border-radius: var(--border-radius);
    overflow-x: auto;
}

/* Content Navigation */
.content-navigation {
    background: var(--white);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

.nav-buttons {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    flex-wrap: wrap;
}

.content-breadcrumb {
    margin-bottom: 1.5rem;
    font-size: 0.875rem;
    color: var(--dark-gray);
}

.content-breadcrumb a {
    color: var(--primary-color);
    text-decoration: none;
}

.content-breadcrumb span {
    margin: 0 0.5rem;
}

/* Tables */
.table-responsive {
    overflow-x: auto;
}

.table {
    width: 100%;
    background: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    border-collapse: collapse;
}

.table thead {
    background: var(--light-gray);
}

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

.table th {
    font-weight: 600;
    color: var(--secondary-color);
}

.action-buttons {
    display: flex;
    gap: 0.5rem;
}

/* Forms */
.form-card {
    background: var(--white);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--secondary-color);
}

.form-control {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--light-gray);
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: border-color 0.3s;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
}

.checkbox-group {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
}

.checkbox-label input[type="checkbox"] {
    width: 20px;
    height: 20px;
    cursor: pointer;
}

.form-actions {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
}

/* Alerts */
.alert {
    padding: 1rem;
    border-radius: var(--border-radius);
    margin-bottom: 1.5rem;
}

.alert-error {
    background: #fadbd8;
    color: var(--danger-color);
    border: 1px solid var(--danger-color);
}

.alert-error ul {
    margin-left: 1.5rem;
}

/* Login Page */
.login-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: linear-gradient(135deg, var(--primary-color), var(--info-color));
}

.login-container {
    width: 100%;
    max-width: 450px;
    padding: 1rem;
}

.login-box {
    background: var(--white);
    border-radius: var(--border-radius);
    box-shadow: 0 10px 40px rgba(0,0,0,0.2);
    overflow: hidden;
}

.login-header {
    text-align: center;
    padding: 2rem;
    background: var(--primary-color);
    color: var(--white);
}

.login-header h1 {
    margin-bottom: 0.5rem;
}

.login-form {
    padding: 2rem;
}

.login-footer {
    padding: 1.5rem;
    background: var(--light-gray);
    font-size: 0.875rem;
}

.login-footer ul {
    margin-top: 0.5rem;
    margin-left: 1.5rem;
}

/* Error Pages */
.error-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: var(--light-gray);
}

.error-container {
    text-align: center;
    padding: 2rem;
}

.error-container h1 {
    font-size: 6rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.error-container h2 {
    font-size: 2rem;
    color: var(--secondary-color);
    margin-bottom: 1rem;
}

.error-container p {
    color: var(--dark-gray);
    margin-bottom: 2rem;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 3rem;
    background: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

.empty-state p {
    color: var(--dark-gray);
    margin-bottom: 1.5rem;
}

/* Footer */
.footer {
    background: var(--secondary-color);
    color: var(--white);
    padding: 2rem 0;
    text-align: center;
    margin-top: 3rem;
}

/* Responsive */
@media (max-width: 768px) {
    .nav-menu {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .page-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .section-grid {
        grid-template-columns: 1fr;
    }
    
    .courses-grid {
        grid-template-columns: 1fr;
    }
    
    .module-card {
        flex-direction: column;
        text-align: center;
    }
    
    .content-card {
        flex-direction: column;
        text-align: center;
    }
    
    .nav-buttons {
        flex-direction: column;
    }
    
    .form-actions {
        flex-direction: column;
    }
}

/* Utilities */
.text-muted {
    color: var(--dark-gray);
}

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

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }