/* Dashboard layout, grids, course reader splits, and responsive breakpoints */

.app-container {
    display: flex;
    min-height: 100vh;
}

/* Sidebar navigation */
.sidebar {
    width: var(--sidebar-width);
    background-color: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    position: fixed;
    height: 100vh;
    left: 0;
    top: 0;
    z-index: 10;
    transition: background-color var(--transition-normal);
}

.sidebar-brand {
    height: var(--header-height);
    display: flex;
    align-items: center;
    padding: 0 1.5rem;
    font-size: 1.25rem;
    font-family: var(--font-heading);
    font-weight: 700;
    color: var(--accent-color);
    border-bottom: 1px solid var(--border-color);
}

.sidebar-menu {
    list-style: none;
    padding: 1.5rem 0.75rem;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    flex: 1;
}

.sidebar-item a {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.625rem 0.75rem;
    color: var(--text-secondary);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
}

.sidebar-item a:hover, .sidebar-item.active a {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}

.sidebar-item.active a {
    color: var(--accent-color);
}

.sidebar-footer {
    padding: 1rem;
    border-top: 1px solid var(--border-color);
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* Main Content Area */
.main-wrapper {
    flex: 1;
    margin-left: var(--sidebar-width);
    display: flex;
    flex-direction: column;
    min-width: 0; /* Prevents flex items from breaking layout overflow */
}

/* Header */
.header {
    height: var(--header-height);
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 2rem;
    position: sticky;
    top: 0;
    z-index: 5;
}

.header-title {
    font-size: 1.125rem;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.user-badge {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    font-weight: 500;
}

.user-avatar {
    width: 2rem;
    height: 2rem;
    border-radius: 50%;
    object-fit: cover;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
}

.main-content {
    padding: 2rem;
    flex: 1;
    max-width: 1200px;
    width: 100%;
    margin: 0 auto;
}

/* Grid Layouts */
.grid-cols-3 {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.5rem;
}

.grid-cols-2 {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(450px, 1fr));
    gap: 1.5rem;
}

/* Dashboard Statistics Headers */
.stats-bar {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.25rem;
    margin-bottom: 2.25rem;
}

.stat-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
    position: relative;
    overflow: hidden;
}

.stat-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.06);
    border-color: var(--accent-light);
}

.stat-info {
    display: flex;
    flex-direction: column;
}

.stat-val {
    font-size: 2rem;
    font-weight: 700;
    margin-top: 0.25rem;
    font-family: var(--font-heading);
    color: var(--text-primary);
    line-height: 1.2;
}

.stat-lbl {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 600;
    color: var(--text-muted);
}

.stat-icon-wrapper {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    flex-shrink: 0;
}

/* Split Course Reader Layout */
.course-reader {
    display: grid;
    grid-template-columns: 300px 1fr;
    height: calc(100vh - var(--header-height));
    overflow: hidden;
}

.reader-sidebar {
    background-color: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    overflow-y: auto;
    padding: 1.5rem 1rem;
}

.reader-content {
    overflow-y: auto;
    padding: 3rem 2rem;
}

.lesson-section-title {
    font-size: 0.75rem;
    text-transform: uppercase;
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: 0.75rem;
    margin-top: 1rem;
}

.lesson-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.lesson-item a {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 0.75rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
    border-radius: var(--radius-md);
}

.lesson-item a:hover, .lesson-item.active a {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}

.lesson-item.active a {
    font-weight: 500;
    border-left: 2px solid var(--accent-color);
    border-top-left-radius: 0;
    border-bottom-left-radius: 0;
}

.lesson-meta {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-left: auto;
}

/* Media Players */
.video-wrapper {
    position: relative;
    padding-bottom: 56.25%; /* 16:9 Aspect Ratio */
    height: 0;
    overflow: hidden;
    border-radius: var(--radius-lg);
    background-color: #000;
    margin-bottom: 1.5rem;
    border: 1px solid var(--border-color);
}

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

.youtube-cropped-iframe {
    position: absolute;
    top: -12%;
    left: -2%;
    width: 104%;
    height: 124%;
    border: 0;
    pointer-events: auto;
}

.pdf-viewer {
    width: 100%;
    height: 600px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    margin-bottom: 1.5rem;
}

/* Mobile Toggle Controls */
.mobile-only-toggle {
    display: none !important;
}

/* Responsive Breakpoints */
@media (max-width: 768px) {
    .mobile-only-toggle {
        display: inline-flex !important;
    }

    .sidebar {
        transform: translateX(-100%);
        transition: transform var(--transition-normal);
        box-shadow: none;
    }
    
    .sidebar.open {
        transform: translateX(0);
        box-shadow: var(--shadow-lg);
    }
    
    .main-wrapper {
        margin-left: 0;
    }
    
    .header {
        padding: 0 1rem;
    }
    
    .course-reader {
        grid-template-columns: 1fr;
        height: auto;
        overflow: visible;
    }
    
    .reader-sidebar {
        border-right: 0;
        border-bottom: 1px solid var(--border-color);
        max-height: 250px;
    }
    
    .grid-cols-2, .grid-cols-3 {
        grid-template-columns: 1fr;
    }
}

/* Premium Header Styling (Dynamic Glassmorphism) */
.public-header {
    height: 72px;
    background: var(--header-bg, rgba(255, 255, 255, 0.85)) !important;
    backdrop-filter: blur(12px) !important;
    -webkit-backdrop-filter: blur(12px) !important;
    border-bottom: 1px solid var(--border-color) !important;
    box-shadow: 0 4px 20px -2px rgba(13, 148, 136, 0.04) !important;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 4rem !important;
    position: sticky;
    top: 0;
    z-index: 100;
    transition: all 0.3s ease !important;
}

[data-theme="dark"] .public-header {
    box-shadow: 0 4px 20px -2px rgba(0, 0, 0, 0.3) !important;
}

.public-header .nav-logo a {
    font-family: var(--font-heading) !important;
    font-size: 1.45rem !important;
    font-weight: 800 !important;
    letter-spacing: -0.03em !important;
    background: linear-gradient(135deg, var(--accent-color) 0%, var(--accent-hover) 100%);
    -webkit-background-clip: text !important;
    -webkit-text-fill-color: transparent !important;
    transition: transform var(--transition-fast) !important;
    display: inline-block;
}

.public-header .nav-logo a:hover {
    transform: scale(1.02);
}

.public-header .public-nav-links {
    display: flex;
    align-items: center;
    gap: 3rem !important;
    list-style: none;
}

.public-header .nav-link-item {
    color: var(--text-muted) !important;
    font-weight: 600 !important;
    font-size: 0.95rem !important;
    position: relative;
    padding: 0.5rem 0;
    text-decoration: none;
    transition: color var(--transition-fast) !important;
}

.public-header .nav-link-item:hover {
    color: var(--accent-color) !important;
}

.public-header .nav-link-item::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-color);
    transition: width 0.3s ease;
    border-radius: 2px;
}

.public-header .nav-link-item:hover::after {
    width: 100%;
}

/* Premium theme toggle design */
.public-header #theme-toggle {
    width: 38px;
    height: 38px;
    border-radius: 50% !important;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-primary) !important;
    border: 1px solid var(--border-color) !important;
    transition: all var(--transition-normal) !important;
    cursor: pointer;
    font-size: 1.05rem !important;
}

.public-header #theme-toggle:hover {
    background: var(--bg-tertiary) !important;
    transform: rotate(15deg) scale(1.08) !important;
}

/* Premium action button */
.public-header .btn-primary {
    background: linear-gradient(135deg, var(--accent-color) 0%, var(--accent-hover) 100%) !important;
    color: #ffffff !important;
    font-weight: 600 !important;
    font-size: 0.9rem !important;
    padding: 0.65rem 1.6rem !important;
    border-radius: 30px !important;
    border: none !important;
    box-shadow: 0 4px 14px rgba(13, 148, 136, 0.25) !important;
    transition: all var(--transition-normal) !important;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

    padding-bottom: 56.25%; /* 16:9 Aspect Ratio */
    height: 0;
    overflow: hidden;
    border-radius: var(--radius-lg);
    background-color: #000;
    margin-bottom: 1.5rem;
    border: 1px solid var(--border-color);
}

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

.youtube-cropped-iframe {
    position: absolute;
    top: -12%;
    left: -2%;
    width: 104%;
    height: 124%;
    border: 0;
    pointer-events: auto;
}

.pdf-viewer {
    width: 100%;
    height: 600px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    margin-bottom: 1.5rem;
}

/* Mobile Toggle Controls */
.mobile-only-toggle {
    display: none !important;
}

/* Responsive Breakpoints */
@media (max-width: 768px) {
    .mobile-only-toggle {
        display: inline-flex !important;
    }

    .sidebar {
        transform: translateX(-100%);
        transition: transform var(--transition-normal);
        box-shadow: none;
    }
    
    .sidebar.open {
        transform: translateX(0);
        box-shadow: var(--shadow-lg);
    }
    
    .main-wrapper {
        margin-left: 0;
    }
    
    .header {
        padding: 0 1rem;
    }
    
    .course-reader {
        grid-template-columns: 1fr;
        height: auto;
        overflow: visible;
    }
    
    .reader-sidebar {
        border-right: 0;
        border-bottom: 1px solid var(--border-color);
        max-height: 250px;
    }
    
    .grid-cols-2, .grid-cols-3 {
        grid-template-columns: 1fr;
    }
}

/* Premium Header Styling (Dynamic Glassmorphism) */
.public-header {
    height: 72px;
    background: var(--header-bg, rgba(255, 255, 255, 0.85)) !important;
    backdrop-filter: blur(12px) !important;
    -webkit-backdrop-filter: blur(12px) !important;
    border-bottom: 1px solid var(--border-color) !important;
    box-shadow: 0 4px 20px -2px rgba(13, 148, 136, 0.04) !important;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 4rem !important;
    position: sticky;
    top: 0;
    z-index: 100;
    transition: all 0.3s ease !important;
}

[data-theme="dark"] .public-header {
    box-shadow: 0 4px 20px -2px rgba(0, 0, 0, 0.3) !important;
}

.public-header .nav-logo a {
    font-family: var(--font-heading) !important;
    font-size: 1.45rem !important;
    font-weight: 800 !important;
    letter-spacing: -0.03em !important;
    background: linear-gradient(135deg, var(--accent-color) 0%, var(--accent-hover) 100%);
    -webkit-background-clip: text !important;
    -webkit-text-fill-color: transparent !important;
    transition: transform var(--transition-fast) !important;
    display: inline-block;
}

.public-header .nav-logo a:hover {
    transform: scale(1.02);
}

.public-header .public-nav-links {
    display: flex;
    align-items: center;
    gap: 3rem !important;
    list-style: none;
}

.public-header .nav-link-item {
    color: var(--text-muted) !important;
    font-weight: 600 !important;
    font-size: 0.95rem !important;
    position: relative;
    padding: 0.5rem 0;
    text-decoration: none;
    transition: color var(--transition-fast) !important;
}

.public-header .nav-link-item:hover {
    color: var(--accent-color) !important;
}

.public-header .nav-link-item::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-color);
    transition: width 0.3s ease;
    border-radius: 2px;
}

.public-header .nav-link-item:hover::after {
    width: 100%;
}

/* Premium theme toggle design */
.public-header #theme-toggle {
    width: 38px;
    height: 38px;
    border-radius: 50% !important;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-primary) !important;
    border: 1px solid var(--border-color) !important;
    transition: all var(--transition-normal) !important;
    cursor: pointer;
    font-size: 1.05rem !important;
}

.public-header #theme-toggle:hover {
    background: var(--bg-tertiary) !important;
    transform: rotate(15deg) scale(1.08) !important;
}

/* Premium action button */
.public-header .btn-primary {
    background: linear-gradient(135deg, var(--accent-color) 0%, var(--accent-hover) 100%) !important;
    color: #ffffff !important;
    font-weight: 600 !important;
    font-size: 0.9rem !important;
    padding: 0.65rem 1.6rem !important;
    border-radius: 30px !important;
    border: none !important;
    box-shadow: 0 4px 14px rgba(13, 148, 136, 0.25) !important;
    transition: all var(--transition-normal) !important;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.public-header .btn-primary:hover {
    transform: translateY(-2px) scale(1.02) !important;
    box-shadow: 0 6px 20px rgba(13, 148, 136, 0.35) !important;
}

.public-header .btn-primary:active {
    transform: translateY(0) scale(0.97) !important;
}

@media (max-width: 768px) {
    .course-detail-container { padding: 1rem 0.5rem !important; }
    .course-header-card { padding: 1.5rem !important; text-align: center; }
    .course-header-content { flex-direction: column !important; text-align: center; align-items: center; }
    .course-header-content h1 { font-size: 1.75rem !important; }
    .public-header { padding: 0 1rem !important; }
    .public-nav-links { gap: 1rem !important; }
    .nav-link-item { font-size: 0.85rem !important; }
}