/* Refined E-Learning Styles - Cleaner & More Consistent */

:root {
    --el-primary: #0277bd;
    --el-primary-dark: #01579b;
    --el-accent: #ff9800;
    --el-bg: #f5f7fa;
    --el-card-bg: #ffffff;
    --el-text-main: #37474f;
    --el-text-light: #78909c;
    --el-border: #eceff1;

    --el-shadow-subtle: 0 1px 3px rgba(0, 0, 0, 0.08);
    --el-shadow-hover: 0 4px 12px rgba(0, 0, 0, 0.12);
    --el-radius: 8px;
    /* Slightly reduced for cleaner look */
}

body {
    background-color: var(--el-bg);
    color: var(--el-text-main);
    font-family: 'Montserrat', sans-serif;
    /* Enforce font */
}

/* Header */
.elearning-header {
    background: var(--el-card-bg);
    padding: 24px 32px;
    border-radius: var(--el-radius);
    box-shadow: var(--el-shadow-subtle);
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 40px;
    border: 1px solid var(--el-border);
}

.elearning-header h1 {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--el-primary);
    margin: 0;
    letter-spacing: -0.5px;
}

/* Course Grid */
.course-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 24px;
    padding-bottom: 60px;
}

.course-card {
    background: var(--el-card-bg);
    border-radius: var(--el-radius);
    border: 1px solid var(--el-border);
    overflow: hidden;
    transition: all 0.2s ease-out;
    display: flex;
    flex-direction: column;
    box-shadow: var(--el-shadow-subtle);
}

.course-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--el-shadow-hover);
    border-color: #cfd8dc;
}

.course-thumbnail {
    width: 100%;
    height: 180px;
    object-fit: cover;
    border-bottom: 1px solid var(--el-border);
}

.course-info {
    padding: 20px;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.course-info h3 {
    font-size: 1.15rem;
    margin: 0 0 8px 0;
    color: var(--el-text-main);
    font-weight: 600;
}

.course-info p {
    font-size: 0.9rem;
    color: var(--el-text-light);
    line-height: 1.5;
    margin-bottom: 20px;
    flex-grow: 1;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    text-overflow: ellipsis;
}

.course-actions {
    display: flex;
    gap: 10px;
    margin-top: auto;
}

/* Standardized Buttons */
button,
.nav-btn,
.primary-btn,
.secondary-btn,
.remove-btn,
.add-content-btn {
    border-radius: 6px;
    /* Uniform radius */
    font-weight: 600;
    font-size: 0.9rem;
    padding: 10px 16px;
    cursor: pointer;
    transition: all 0.2s;
    border: none;
    font-family: inherit;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    line-height: 1;
    text-decoration: none;
}

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

.primary-btn:hover {
    background-color: var(--el-primary-dark);
    box-shadow: 0 2px 4px rgba(2, 119, 189, 0.3);
}

.secondary-btn {
    background-color: white;
    color: var(--el-text-light);
    border: 1px solid #cfd8dc;
}

.secondary-btn:hover {
    border-color: var(--el-primary);
    color: var(--el-primary);
    background-color: #f0f7fb;
}

.nav-btn {
    background: transparent;
    color: var(--el-primary);
}

.nav-btn:hover {
    background: #e1f5fe;
}


/* Admin specific buttons */
.admin-actions-group {
    display: flex;
    gap: 8px;
    flex-grow: 1;
}

.admin-actions-group button {
    flex: 1;
}

/* Player Views */
.player-layout {
    display: flex;
    gap: 24px;
    margin-top: 24px;
    align-items: flex-start;
}

.course-sidebar {
    width: 320px;
    background: white;
    border-radius: var(--el-radius);
    border: 1px solid var(--el-border);
    position: sticky;
    top: 20px;
    max-height: calc(100vh - 40px);
    overflow-y: auto;
    flex-shrink: 0;
}

.course-sidebar h3 {
    padding: 16px 20px;
    margin: 0;
    background: #fafafa;
    border-bottom: 1px solid var(--el-border);
    font-size: 1rem;
    text-transform: uppercase;
    font-weight: 700;
    letter-spacing: 0.5px;
    color: var(--el-text-light);
}

.module-header {
    background: #fcfcfc;
    padding: 12px 20px;
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--el-text-main);
    border-top: 1px solid var(--el-border);
    border-bottom: 1px solid var(--el-border);
}

.module-header:first-of-type {
    border-top: none;
}

.lesson-item {
    padding: 10px 20px 10px 24px;
    font-size: 0.9rem;
    color: var(--el-text-light);
    border-left: 3px solid transparent;
}

.lesson-item:hover {
    color: var(--el-primary);
    background: #f0f7fb;
}

.lesson-item.active {
    background: #e1f5fe;
    color: var(--el-primary-dark);
    border-left-color: var(--el-primary);
    font-weight: 600;
}

.player-content {
    flex-grow: 1;
    background: white;
    padding: 40px;
    border-radius: var(--el-radius);
    border: 1px solid var(--el-border);
    min-height: 500px;
}

.player-content h2 {
    margin-top: 0;
    font-size: 1.8rem;
    color: var(--el-text-main);
}


/* Admin Dashboard Tabs */
.admin-tabs {
    display: flex;
    gap: 12px;
    margin-bottom: 24px;
    border: none;
}

.admin-tab-btn {
    border-radius: 20px;
    background: white;
    border: 1px solid var(--el-border);
    color: var(--el-text-light);
    padding: 10px 20px;
}

.admin-tab-btn.active {
    background: var(--el-bg);
    /* darker bg for active */
    color: var(--el-primary);
    border-color: var(--el-primary);
    font-weight: 700;
}

.admin-tab-btn .badge {
    background: #ef5350;
    color: white;
    padding: 2px 6px;
    border-radius: 10px;
    font-size: 0.75rem;
    margin-left: 6px;
    display: none;
}

.admin-tab-btn .badge.visible {
    display: inline-block;
}

.admin-tab-content {
    display: none !important;
}

.admin-tab-content.active {
    display: block !important;
    animation: fadeIn 0.3s;
}


/* Builder */
.builder-module {
    margin-bottom: 16px;
    border: 1px solid var(--el-border);
    border-radius: 6px;
    background: #fff;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.03);
}

.lessons-container {
    padding: 0 12px 12px 12px;
}

.builder-lesson {
    background: #fafafa;
    border: 1px solid #eee;
    margin-top: 8px;
    border-radius: 4px;
    padding: 8px 12px;
}

/* Modals */
.modal-content {
    padding: 32px;
    border-radius: 12px;
    border: none;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

form label {
    font-size: 0.9rem;
    color: var(--el-text-light);
    margin-top: 20px;
    margin-bottom: 6px;
    display: block;
}

form input[type="text"],
form input[type="url"],
form textarea,
form select {
    background: #f5f7fa;
    border: 1px solid #cfd8dc;
    border-radius: 6px;
    padding: 12px;
    width: 100%;
    font-family: inherit;
    transition: all 0.2s;
}

form input:focus {
    background: white;
    border-color: var(--el-primary);
    outline: none;
    box-shadow: 0 0 0 3px rgba(2, 119, 189, 0.1);
}

/* Utilities */
.spacer-20 {
    height: 20px;
}

/* Responsive */
@media (max-width: 800px) {
    .elearning-header {
        flex-direction: column;
        text-align: center;
        gap: 16px;
    }

    .player-layout {
        flex-direction: column;
    }

    .course-sidebar {
        width: 100%;
        max-height: 300px;
        position: static;
    }
}