/* Variables de colores */
:root {
    --primary-color: #0c39cf;    /* Morado oscuro */
    --secondary-color: #009bc2;  /* Azul */
    --accent-color: #27AE60;     /* Verde para completado */
    --background-color: #FFFFFF; /* Blanco */
    --text-color: #2C3E50;       /* Gris oscuro */
    --light-gray: #F8F9FA;
    --border-color: #E9ECEF;
    --success-color: #28A745;
    --warning-color: #FFC107;
    --danger-color: #DC3545;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--background-color);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header y Navegación */
.header {
    background: var(--primary-color);
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar {
    padding: 0;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-logo .logo-link {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: white;
    font-size: 1.5rem;
    font-weight: bold;
}

.nav-logo .logo-link i {
    margin-right: 10px;
    font-size: 1.8rem;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 20px;
}

.nav-link {
    color: white;
    text-decoration: none;
    padding: 10px 15px;
    border-radius: 5px;
    transition: background-color 0.3s;
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-link:hover {
    background-color: rgba(255,255,255,0.1);
}

.nav-link.btn-primary {
    background-color: var(--secondary-color);
}

.nav-link.btn-primary:hover {
    background-color: #2980B9;
}

.nav-user {
    position: relative;
    cursor: pointer;
}

.user-name {
    color: white;
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 15px;
}

.user-dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    background: white;
    border-radius: 5px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    min-width: 200px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s;
}

.nav-user:hover .user-dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-link {
    display: block;
    padding: 12px 20px;
    color: var(--text-color);
    text-decoration: none;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 10px;
}

.dropdown-link:hover {
    background-color: var(--light-gray);
}

.dropdown-link:last-child {
    border-bottom: none;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background: white;
    margin: 3px 0;
    transition: 0.3s;
}

/* Breadcrumb */
.breadcrumb {
    background-color: var(--light-gray);
    padding: 15px 0;
    border-bottom: 1px solid var(--border-color);
}

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

.breadcrumb a:hover {
    text-decoration: underline;
}

.breadcrumb-separator {
    margin: 0 10px;
    color: #6C757D;
}

.breadcrumb-current {
    color: var(--text-color);
    font-weight: 500;
}

/* Page Header */
.page-header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 60px 0;
    text-align: center;
}

.page-header h1 {
    font-size: 2.5rem;
    margin-bottom: 15px;
}

.page-subtitle {
    font-size: 1.2rem;
    opacity: 0.9;
}

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

/* Cards */
.card {
    background: white;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.08);
    overflow: hidden;
    transition: transform 0.3s, box-shadow 0.3s;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.15);
}

.card-header {
    padding: 20px;
    background: var(--primary-color);
    color: white;
}

.card-body {
    padding: 20px;
}

.card-footer {
    padding: 15px 20px;
    background: var(--light-gray);
    border-top: 1px solid var(--border-color);
}

/* Botones */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border: none;
    border-radius: 5px;
    text-decoration: none;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s;
    font-weight: 500;
}

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

.btn-primary:hover {
    background-color: #2980B9;
    transform: translateY(-2px);
}

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

.btn-success:hover {
    background-color: #219A52;
}

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

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

/* Grid de cursos */
.courses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 30px;
    padding: 40px 0;
}

.course-card {
    background: white;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0,0,0,0.08);
    transition: transform 0.3s, box-shadow 0.3s;
}

.course-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.15);
}

.course-image {
    width: 100%;
    height: 200px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 3rem;
}

.course-content {
    padding: 20px;
}

.course-title {
    font-size: 1.3rem;
    margin-bottom: 10px;
    color: var(--text-color);
}

.course-description {
    color: #6C757D;
    margin-bottom: 15px;
    line-height: 1.5;
}

.course-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 15px;
    padding-top: 15px;
    border-top: 1px solid var(--border-color);
}

.course-instructor {
    color: var(--secondary-color);
    font-weight: 500;
}

/* Progress bars */
.progress {
    background-color: var(--light-gray);
    border-radius: 10px;
    height: 8px;
    overflow: hidden;
    margin: 10px 0;
}

.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--secondary-color), var(--accent-color));
    border-radius: 10px;
    transition: width 0.3s;
}

/* Forms */
.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text-color);
}

.form-control {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid var(--border-color);
    border-radius: 5px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

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

/* Alertas */
.alert {
    padding: 15px 20px;
    border-radius: 5px;
    margin-bottom: 20px;
    border-left: 4px solid;
}

.alert-success {
    background-color: #D4EDDA;
    border-color: var(--accent-color);
    color: #155724;
}

.alert-error {
    background-color: #F8D7DA;
    border-color: var(--danger-color);
    color: #721C24;
}

.alert-warning {
    background-color: #FFF3CD;
    border-color: var(--warning-color);
    color: #856404;
}

/* Responsive */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .courses-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .page-header h1 {
        font-size: 2rem;
    }
    
    .container {
        padding: 0 15px;
    }
}

/* Footer */
.footer {
    background-color: var(--primary-color);
    color: white;
    padding: 40px 0;
    margin-top: 60px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
}

.footer-section h3 {
    margin-bottom: 20px;
    font-size: 1.3rem;
}

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

.footer-links li {
    margin-bottom: 10px;
}

.footer-links a {
    color: #BDC3C7;
    text-decoration: none;
    transition: color 0.3s;
}

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

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    margin-top: 20px;
    border-top: 1px solid rgba(255,255,255,0.1);
    color: #BDC3C7;
}

/* Utility classes */
.text-center { text-align: center; }
.text-right { text-align: right; }
.mt-20 { margin-top: 20px; }
.mb-20 { margin-bottom: 20px; }
.p-20 { padding: 20px; }
.d-flex { display: flex; }
.justify-between { justify-content: space-between; }
.align-center { align-items: center; }
.w-100 { width: 100%; }

/* Video player styles */
.video-container {
    position: relative;
    width: 100%;
    padding-bottom: 56.25%; /* 16:9 aspect ratio */
    height: 0;
    background: #000;
}

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

/* Notes section */
.notes-section {
    background: var(--light-gray);
    border-radius: 10px;
    padding: 20px;
    margin-top: 20px;
}

.notes-list {
    max-height: 300px;
    overflow-y: auto;
}

.note-item {
    background: white;
    padding: 15px;
    margin-bottom: 10px;
    border-radius: 5px;
    border-left: 4px solid var(--secondary-color);
}

.note-timestamp {
    color: var(--secondary-color);
    font-size: 0.9rem;
    margin-bottom: 5px;
}