/* Modern SaaS / High-End Dark Theme */
:root {
    /* Color Palette */
    --bg-body: #0f172a; /* Slate 900 */
    --bg-surface: #1e293b; /* Slate 800 */
    --bg-surface-hover: #334155; /* Slate 700 */
    --text-primary: #f8fafc; /* Slate 50 */
    --text-secondary: #94a3b8; /* Slate 400 */
    --accent-primary: #38bdf8; /* Sky 400 */
    --accent-secondary: #818cf8; /* Sky 400 */
    --border-color: #334155; /* Slate 700 */
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-glow: 0 0 15px rgba(56, 189, 248, 0.15);
}

body {
    background-color: var(--bg-body);
    color: var(--text-primary);
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* Navbar */
.navbar {
    background-color: rgba(15, 23, 42, 0.85) !important;
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    padding: var(--spacing-md) 0;
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.5rem;
    letter-spacing: -0.025em;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-link {
    color: var(--text-secondary) !important;
    font-weight: 500;
    transition: color 0.2s ease;
}

.nav-link:hover, .nav-link.active {
    color: var(--text-primary) !important;
}

/* Search Input */
.form-control.search-input {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    border-radius: 9999px; /* Pill shape */
    padding-left: 1.25rem;
    padding-right: 1.25rem;
    transition: all 0.2s ease;
}

.form-control.search-input:focus {
    background-color: var(--bg-surface);
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 2px rgba(56, 189, 248, 0.2);
    color: var(--text-primary);
}

/* Cards & Video Items */
.video-item {
    display: block;
    text-decoration: none;
    transition: transform 0.3s ease;
}

.video-item:hover {
    transform: translateY(-4px);
}

.thumb-container {
    position: relative;
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    background-color: var(--bg-surface);
}

.thumb-img {
    transition: transform 0.5s ease;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.video-item:hover .thumb-img {
    transform: scale(1.05);
}

.duration-badge {
    position: absolute;
    bottom: 8px;
    right: 8px;
    background-color: rgba(0, 0, 0, 0.75);
    color: white;
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
    backdrop-filter: blur(4px);
}

.video-info {
    padding-top: var(--spacing-sm);
}

.video-title {
    font-size: 0.95rem;
    font-weight: 600;
    line-height: 1.4;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    transition: color 0.2s ease;
}

.video-item:hover .video-title {
    color: var(--accent-primary);
}

.video-meta {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

/* Sidebar Categories */
.card.bg-dark {
    background-color: var(--bg-surface) !important;
    border: 1px solid var(--border-color) !important;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.card-header {
    background-color: transparent !important;
    border-bottom: 1px solid var(--border-color) !important;
    padding: var(--spacing-md);
    font-weight: 600;
    letter-spacing: 0.025em;
    text-transform: uppercase;
    font-size: 0.75rem;
    color: var(--text-secondary) !important;
}

.list-group-item {
    background-color: transparent !important;
    border-color: var(--border-color) !important;
    color: var(--text-secondary) !important;
    padding: 0.6rem 1rem;
    font-size: 0.9rem;
    transition: all 0.2s;
}

.list-group-item:hover {
    background-color: var(--bg-surface-hover) !important;
    color: var(--text-primary) !important;
    padding-left: 1.25rem; /* Slide effect */
}

/* Category Pills (Tags) */
.badge.bg-secondary {
    background-color: var(--bg-surface) !important;
    color: var(--text-secondary) !important;
    border: 1px solid var(--border-color);
    font-weight: 500;
    padding: 0.5em 1em;
    border-radius: 9999px;
    transition: all 0.2s ease;
}

.badge.bg-secondary:hover {
    background-color: var(--bg-surface-hover) !important;
    color: var(--text-primary) !important;
    border-color: var(--accent-primary);
    transform: translateY(-1px);
}

/* Headings */
h1, h2, h3, h4, h5, h6 {
    color: var(--text-primary);
    font-weight: 700;
    letter-spacing: -0.025em;
}

/* Buttons */
.btn-primary {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    border: none;
    font-weight: 600;
    padding: 0.6rem 1.5rem;
    border-radius: var(--radius-md);
    box-shadow: 0 4px 6px -1px rgba(56, 189, 248, 0.3);
    transition: all 0.2s ease;
}

.btn-primary:hover {
    opacity: 0.9;
    transform: translateY(-1px);
    box-shadow: 0 6px 8px -1px rgba(56, 189, 248, 0.4);
}

/* Pagination */
.page-link {
    background-color: var(--bg-surface) !important;
    border-color: var(--border-color) !important;
    color: var(--text-secondary) !important;
    border-radius: var(--radius-md);
    margin: 0 2px;
}

.page-link:hover {
    background-color: var(--bg-surface-hover) !important;
    color: var(--text-primary) !important;
}

/* Footer */
footer {
    background-color: var(--bg-body) !important;
    border-top: 1px solid var(--border-color);
    padding-top: var(--spacing-xl);
    margin-top: var(--spacing-xl);
}

/* Watch Page */
.video-wrapper {
    box-shadow: var(--shadow-lg) !important;
    border: 1px solid var(--border-color);
    background-color: #000 !important; /* Keep video bg black */
}

/* Category Grid on Categories Page */
.hover-card {
    background-color: var(--bg-surface) !important;
    border: 1px solid var(--border-color) !important;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.hover-card:hover {
    transform: translateY(-4px) !important;
    border-color: var(--accent-primary) !important;
    box-shadow: var(--shadow-glow) !important;
}

.hover-card .card-title {
    color: var(--text-primary) !important;
}

.hover-card .badge {
    background-color: var(--bg-surface-hover) !important;
}