/* ═══════════════════════════════════════════════════
   QuaMetry — Video Library Page Styles
   ═══════════════════════════════════════════════════ */

/* ──── Page Root ──── */
.videos-page {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px 80px;
}

/* ═══════════════════════════════════════════════════
   HERO
   ═══════════════════════════════════════════════════ */

.videos-hero {
    position: relative;
    padding: 64px 0 52px;
    margin-bottom: 48px;
    border-bottom: 1px solid var(--border-color);
    overflow: hidden;
}

.videos-hero-inner {
    position: relative;
    z-index: 1;
    max-width: 640px;
}

.videos-hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: var(--color-secondary-light, #ede9fe);
    color: var(--color-secondary, #7c3aed);
    border: 1px solid rgba(124, 58, 237, 0.2);
    padding: 5px 14px;
    border-radius: 9999px;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    margin-bottom: 20px;
}

.videos-hero-title {
    font-size: clamp(2rem, 5vw, 3.2rem);
    font-weight: 800;
    line-height: 1.15;
    margin: 0 0 14px;
    color: var(--text-primary);
    letter-spacing: -1px;
}

.videos-hero-accent {
    background: linear-gradient(135deg, #7c3aed 0%, #2563eb 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.videos-hero-subtitle {
    font-size: 1.05rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin: 0 0 32px;
}

/* Hero Search */
.videos-search-form {
    max-width: 520px;
}

.videos-search-bar {
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--bg-card);
    border: 1.5px solid var(--border-color);
    border-radius: 9999px;
    padding: 8px 8px 8px 18px;
    box-shadow: var(--shadow-md);
    transition: border-color var(--transition), box-shadow var(--transition);
}

.videos-search-bar:focus-within {
    border-color: var(--color-secondary, #7c3aed);
    box-shadow: 0 0 0 4px rgba(124, 58, 237, 0.12), var(--shadow-md);
}

.videos-search-icon {
    color: var(--text-muted);
    flex-shrink: 0;
}

.videos-search-input {
    border: none;
    outline: none;
    background: transparent;
    font-family: var(--font);
    font-size: 14px;
    color: var(--text-primary);
    flex: 1;
    min-width: 0;
}

.videos-search-input::placeholder {
    color: var(--text-muted);
}

.videos-search-btn {
    background: var(--color-primary);
    color: white;
    border: none;
    border-radius: 9999px;
    padding: 9px 22px;
    font-size: 13px;
    font-weight: 700;
    font-family: var(--font);
    cursor: pointer;
    transition: background var(--transition), transform var(--transition);
    flex-shrink: 0;
}

.videos-search-btn:hover {
    background: var(--color-primary-hover);
    transform: scale(1.03);
}

[data-theme="dark"] .videos-search-bar {
    background: #1e293b;
    border-color: #334155;
}

/* Hero Blobs */
.videos-hero-blob {
    position: absolute;
    border-radius: 50%;
    filter: blur(90px);
    pointer-events: none;
    opacity: 0.18;
}

.videos-hero-blob-1 {
    width: 450px;
    height: 450px;
    background: radial-gradient(circle, #7c3aed, transparent);
    top: -140px;
    right: -100px;
}

.videos-hero-blob-2 {
    width: 280px;
    height: 280px;
    background: radial-gradient(circle, #2563eb, transparent);
    bottom: -80px;
    right: 200px;
}

[data-theme="dark"] .videos-hero-blob-1 {
    opacity: 0.10;
}

[data-theme="dark"] .videos-hero-blob-2 {
    opacity: 0.08;
}

/* ═══════════════════════════════════════════════════
   LAYOUT
   ═══════════════════════════════════════════════════ */

.videos-layout {
    display: grid;
    grid-template-columns: 240px 1fr;
    gap: 32px;
    align-items: start;
}

/* ═══════════════════════════════════════════════════
   SIDEBAR
   ═══════════════════════════════════════════════════ */

.videos-sidebar {
    position: sticky;
    top: 80px;
}

.videos-sidebar-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 22px;
    box-shadow: var(--shadow-sm);
}

.videos-sidebar-title {
    display: flex;
    align-items: center;
    gap: 9px;
    font-size: 0.9rem;
    font-weight: 800;
    color: var(--text-primary);
    margin: 0 0 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-color);
}

.videos-sidebar-title svg {
    color: var(--color-primary);
}

.videos-category-nav {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.video-cat-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 9px 12px;
    border-radius: 10px;
    font-size: 0.88rem;
    font-weight: 500;
    color: var(--text-secondary);
    text-decoration: none;
    transition: background var(--transition), color var(--transition);
}

.video-cat-item:hover {
    background: var(--color-primary-light);
    color: var(--color-primary);
}

.video-cat-item--active {
    background: var(--color-primary);
    color: white !important;
    font-weight: 700;
    box-shadow: var(--shadow-sm);
}

.video-cat-item--active:hover {
    background: var(--color-primary-hover);
}

.video-cat-count {
    margin-left: auto;
    font-size: 11px;
    font-weight: 700;
    background: rgba(0, 0, 0, 0.08);
    padding: 2px 7px;
    border-radius: 9999px;
}

.video-cat-item--active .video-cat-count {
    background: rgba(255, 255, 255, 0.2);
}

.videos-sidebar-clear {
    margin-top: 16px;
    padding-top: 12px;
    border-top: 1px solid var(--border-color);
}

/* ═══════════════════════════════════════════════════
   FILTER BAR
   ═══════════════════════════════════════════════════ */

.videos-filter-bar {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.videos-filter-pill {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: var(--color-primary-light);
    color: var(--color-primary);
    border: 1px solid rgba(37, 99, 235, 0.15);
    padding: 5px 13px;
    border-radius: 9999px;
    font-size: 13px;
    font-weight: 600;
}

.videos-results-count {
    margin-left: auto;
    font-size: 13px;
    color: var(--text-muted);
    font-weight: 500;
}

/* ═══════════════════════════════════════════════════
   VIDEO GRID
   ═══════════════════════════════════════════════════ */

.videos-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

/* ═══════════════════════════════════════════════════
   VIDEO CARD
   ═══════════════════════════════════════════════════ */

.video-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    text-decoration: none;
    color: inherit;
    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
    box-shadow: var(--shadow-sm);
}

.video-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(124, 58, 237, 0.2);
}

/* Thumbnail */
.video-card-thumb {
    position: relative;
    aspect-ratio: 16 / 9;
    overflow: hidden;
    background: linear-gradient(135deg, #1e1b4b, #312e81);
    flex-shrink: 0;
}

.video-card-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.45s ease;
}

.video-card:hover .video-card-img {
    transform: scale(1.06);
}

/* Play Overlay */
.video-play-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.35);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity var(--transition);
}

.video-card:hover .video-play-overlay {
    opacity: 1;
}

.video-play-btn {
    width: 52px;
    height: 52px;
    background: rgba(255, 255, 255, 0.95);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-secondary, #7c3aed);
    transform: scale(0.85);
    transition: transform var(--transition);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.video-card:hover .video-play-btn {
    transform: scale(1);
}

/* Badges */
.video-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 3px 10px;
    border-radius: 9999px;
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.3px;
}

.video-badge--featured {
    position: absolute;
    top: 10px;
    left: 10px;
    background: rgba(217, 119, 6, 0.9);
    color: white;
    backdrop-filter: blur(4px);
}

.video-badge-row {
    position: absolute;
    bottom: 10px;
    right: 10px;
    display: flex;
    gap: 5px;
}

.video-badge--completed {
    background: rgba(16, 185, 129, 0.9);
    color: white;
    backdrop-filter: blur(4px);
}

.video-badge--youtube {
    background: rgba(220, 38, 38, 0.9);
    color: white;
    backdrop-filter: blur(4px);
}

.video-badge--udemy {
    background: rgba(124, 58, 237, 0.9);
    color: white;
    backdrop-filter: blur(4px);
}

/* Card Body */
.video-card-body {
    padding: 18px 20px 20px;
    display: flex;
    flex-direction: column;
    flex: 1;
    gap: 8px;
}

.video-card-category {
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.6px;
    text-transform: uppercase;
    color: var(--color-secondary, #7c3aed);
}

.video-card-title {
    font-size: 0.95rem;
    font-weight: 700;
    line-height: 1.4;
    color: var(--text-primary);
    margin: 0;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.video-card-desc {
    font-size: 0.83rem;
    color: var(--text-secondary);
    line-height: 1.55;
    margin: 0;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    flex: 1;
}

.video-card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    padding-top: 12px;
    border-top: 1px solid var(--border-color);
    margin-top: auto;
}

.video-card-instructor {
    display: flex;
    align-items: center;
    gap: 5px;
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 500;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.video-card-watch {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    font-size: 12px;
    font-weight: 700;
    color: var(--color-primary);
    white-space: nowrap;
    flex-shrink: 0;
    transition: gap var(--transition);
}

.video-card:hover .video-card-watch {
    gap: 8px;
}

/* ═══════════════════════════════════════════════════
   EMPTY STATE
   ═══════════════════════════════════════════════════ */

.videos-empty {
    text-align: center;
    padding: 80px 24px;
    background: var(--bg-card);
    border: 1px dashed var(--border-color);
    border-radius: 20px;
    color: var(--text-muted);
}

.videos-empty-icon {
    width: 96px;
    height: 96px;
    margin: 0 auto 20px;
    background: var(--bg-body);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.videos-empty h3 {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.videos-empty p {
    font-size: 0.9rem;
    margin-bottom: 24px;
}

/* ═══════════════════════════════════════════════════
   RESPONSIVE
   ═══════════════════════════════════════════════════ */

@media (max-width: 1100px) {
    .videos-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 900px) {
    .videos-layout {
        grid-template-columns: 1fr;
    }

    .videos-sidebar {
        position: static;
    }

    .videos-category-nav {
        flex-direction: row;
        flex-wrap: wrap;
        gap: 6px;
    }

    .video-cat-item {
        padding: 6px 14px;
        border-radius: 9999px;
        font-size: 0.83rem;
        border: 1px solid var(--border-color);
    }

    .video-cat-count {
        display: none;
    }
}

@media (max-width: 768px) {
    .videos-page {
        padding: 0 16px 60px;
    }

    .videos-hero {
        padding: 48px 0 40px;
    }

    .videos-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .videos-search-form {
        max-width: 100%;
    }
}

@media (max-width: 480px) {
    .videos-hero-title {
        font-size: 1.9rem;
    }

    .videos-grid {
        grid-template-columns: 1fr;
    }
}

/* ═══════════════════════════════════════════════════
   VIDEO DETAIL PAGE  (vd-*)
   ═══════════════════════════════════════════════════ */

.vd-page {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px 80px;
}

/* ── Breadcrumb ── */
.vd-breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 24px 0 20px;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.vd-breadcrumb a {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 600;
    transition: opacity var(--transition);
}

.vd-breadcrumb a:hover {
    opacity: 0.75;
}

.vd-breadcrumb-sep {
    opacity: 0.4;
}

/* ── 2-col layout ── */
.vd-layout {
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: 28px;
    align-items: start;
}

.vd-main {
    display: flex;
    flex-direction: column;
    gap: 20px;
    min-width: 0;
}

/* ── Player Card ── */
.vd-player-card {
    border-radius: 20px;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    background: #0f0f0f;
}

.vd-player-frame {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 9;
}

.vd-player-frame iframe {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    border: none;
}

/* Udemy Banner */
.vd-udemy-banner {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 16px;
    padding: 64px 40px;
    background: linear-gradient(135deg, #1e1b4b 0%, #312e81 50%, #3730a3 100%);
    text-align: center;
    color: white;
    min-height: 320px;
}

.vd-udemy-icon {
    width: 96px;
    height: 96px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.08);
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid rgba(255, 255, 255, 0.15);
}

.vd-udemy-banner h3 {
    font-size: 1.4rem;
    font-weight: 800;
    margin: 0;
    color: white;
}

.vd-udemy-banner p {
    font-size: 0.95rem;
    opacity: 0.75;
    margin: 0;
}

.vd-udemy-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: white;
    color: #6d28d9 !important;
    padding: 12px 28px;
    border-radius: 9999px;
    font-weight: 700;
    font-size: 15px;
    text-decoration: none;
    transition: transform var(--transition), box-shadow var(--transition);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.25);
    margin-top: 8px;
}

.vd-udemy-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}

/* ── Video Info Card ── */
.vd-info-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 32px;
    display: flex;
    flex-direction: column;
    gap: 14px;
    box-shadow: var(--shadow-sm);
}

.vd-category-badge {
    display: inline-block;
    background: var(--color-primary-light);
    color: var(--color-primary);
    border: 1px solid rgba(37, 99, 235, 0.15);
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.6px;
    text-transform: uppercase;
    padding: 4px 14px;
    border-radius: 9999px;
    align-self: flex-start;
}

.vd-featured-badge {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    background: rgba(217, 119, 6, 0.1);
    color: #d97706;
    border: 1px solid rgba(217, 119, 6, 0.2);
    font-size: 11px;
    font-weight: 700;
    padding: 3px 12px;
    border-radius: 9999px;
    align-self: flex-start;
}

.vd-title {
    font-size: clamp(1.4rem, 3vw, 1.9rem);
    font-weight: 800;
    line-height: 1.3;
    color: var(--text-primary);
    margin: 0;
    letter-spacing: -0.3px;
}

.vd-meta {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
    padding-top: 4px;
    border-top: 1px solid var(--border-color);
    font-size: 0.88rem;
    color: var(--text-secondary);
}

.vd-meta-item {
    display: flex;
    align-items: center;
    gap: 6px;
}

.vd-meta-sep {
    opacity: 0.35;
}

.vd-instructor-link {
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 600;
    transition: opacity var(--transition);
}

.vd-instructor-link:hover {
    opacity: 0.75;
}

.vd-source-badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 9999px;
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.3px;
}

.vd-source-badge--youtube {
    background: rgba(220, 38, 38, 0.1);
    color: #dc2626;
    border: 1px solid rgba(220, 38, 38, 0.2);
}

.vd-source-badge--udemy {
    background: rgba(124, 58, 237, 0.1);
    color: #7c3aed;
    border: 1px solid rgba(124, 58, 237, 0.2);
}

.vd-description {
    font-size: 1rem;
    line-height: 1.8;
    color: var(--text-secondary);
    padding-top: 4px;
}

/* ── Comments Card ── */
.vd-comments-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 32px;
    box-shadow: var(--shadow-sm);
}

.vd-comments-title {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.1rem;
    font-weight: 800;
    color: var(--text-primary);
    margin: 0 0 24px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border-color);
}

.vd-comments-title svg {
    color: var(--color-primary);
}

.vd-comment-count {
    margin-left: auto;
    font-size: 13px;
    font-weight: 700;
    background: var(--color-primary-light);
    color: var(--color-primary);
    padding: 2px 10px;
    border-radius: 9999px;
}

/* Comment Composer */
.vd-comment-form {
    margin-bottom: 28px;
}

.vd-comment-composer {
    display: flex;
    gap: 14px;
    align-items: flex-start;
}

.vd-comment-avatar {
    width: 38px;
    height: 38px;
    border-radius: 50%;
    background: var(--color-primary);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 15px;
    flex-shrink: 0;
}

.vd-comment-input-wrap {
    flex: 1;
}

.vd-comment-textarea {
    width: 100%;
    padding: 14px 16px;
    border: 1.5px solid var(--border-color);
    border-radius: 14px;
    background: var(--bg-body);
    color: var(--text-primary);
    font-family: var(--font);
    font-size: 0.9rem;
    line-height: 1.6;
    resize: none;
    transition: border-color var(--transition), box-shadow var(--transition);
    box-sizing: border-box;
}

.vd-comment-textarea:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.1);
    outline: none;
}

.vd-comment-textarea::placeholder {
    color: var(--text-muted);
}

[data-theme="dark"] .vd-comment-textarea {
    background: #1e293b;
    border-color: #334155;
}

.vd-comment-actions {
    display: flex;
    justify-content: flex-end;
    margin-top: 10px;
}

/* Comment List */
.vd-comments-empty {
    text-align: center;
    padding: 40px 24px;
    color: var(--text-muted);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

.vd-comment-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.vd-comment-item {
    display: flex;
    gap: 14px;
    align-items: flex-start;
}

.vd-comment-item-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--bg-body);
    border: 1.5px solid var(--border-color);
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 13px;
    flex-shrink: 0;
}

.vd-comment-item-body {
    flex: 1;
    background: var(--bg-body);
    border: 1px solid var(--border-color);
    border-radius: 14px;
    padding: 16px 18px;
}

[data-theme="dark"] .vd-comment-item-body {
    background: rgba(255, 255, 255, 0.03);
}

.vd-comment-item-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 8px;
}

.vd-comment-author {
    font-size: 0.88rem;
    font-weight: 700;
    color: var(--text-primary);
}

.vd-comment-time {
    font-size: 0.78rem;
    color: var(--text-muted);
}

.vd-comment-text {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.65;
    margin: 0;
}

/* ════════ DETAIL SIDEBAR ════════ */
.vd-sidebar {
    display: flex;
    flex-direction: column;
    gap: 16px;
    position: sticky;
    top: 80px;
}

/* Progress Card */
.vd-progress-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 28px 24px;
    text-align: center;
    box-shadow: var(--shadow-sm);
}

.vd-progress-card--done {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.06) 0%, rgba(16, 185, 129, 0.02) 100%);
    border-color: rgba(16, 185, 129, 0.2);
}

.vd-progress-icon {
    width: 72px;
    height: 72px;
    background: var(--color-primary-light);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-primary);
    margin: 0 auto 16px;
}

.vd-completed-icon {
    width: 72px;
    height: 72px;
    background: rgba(16, 185, 129, 0.12);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-success);
    margin: 0 auto 16px;
}

.vd-progress-card h3 {
    font-size: 1.05rem;
    font-weight: 800;
    color: var(--text-primary);
    margin: 0 0 8px;
}

.vd-progress-card p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin: 0 0 20px;
}

.vd-complete-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    background: var(--color-success);
    color: white;
    border: none;
    border-radius: 9999px;
    padding: 13px 20px;
    font-weight: 700;
    font-size: 14px;
    font-family: var(--font);
    cursor: pointer;
    transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
    box-shadow: 0 4px 16px rgba(16, 185, 129, 0.3);
}

.vd-complete-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(16, 185, 129, 0.4);
    background: #059669;
}

/* Back Button */
.vd-back-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 9999px;
    padding: 12px 20px;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-secondary);
    text-decoration: none;
    transition: color var(--transition), border-color var(--transition), transform var(--transition);
    text-align: center;
}

.vd-back-btn:hover {
    color: var(--color-primary);
    border-color: var(--color-primary);
    transform: translateX(-3px);
}

/* Quick Info */
.vd-quick-info {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 24px;
    box-shadow: var(--shadow-sm);
}

.vd-quick-info-title {
    font-size: 0.9rem;
    font-weight: 800;
    color: var(--text-primary);
    margin: 0 0 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-color);
}

.vd-quick-info-list {
    display: flex;
    flex-direction: column;
    gap: 13px;
}

.vd-quick-info-item {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 12px;
}

.vd-quick-info-label {
    font-size: 0.82rem;
    color: var(--text-muted);
    font-weight: 500;
    flex-shrink: 0;
}

.vd-quick-info-value {
    font-size: 0.85rem;
    color: var(--text-primary);
    font-weight: 600;
    text-align: right;
}

/* ── Responsive ── */
@media (max-width: 1024px) {
    .vd-layout {
        grid-template-columns: 1fr 280px;
    }
}

@media (max-width: 768px) {
    .vd-page {
        padding: 0 16px 60px;
    }

    .vd-layout {
        grid-template-columns: 1fr;
    }

    .vd-sidebar {
        position: static;
    }

    .vd-info-card,
    .vd-comments-card {
        padding: 22px 18px;
    }

    .vd-title {
        font-size: 1.35rem;
    }

    .vd-udemy-banner {
        padding: 48px 24px;
    }
}