:root {
    --ytf-bg: #fff;
    --ytf-bg-alt: #f5f5f7;
    --ytf-text: #1a1a1a;
    --ytf-text-light: #666;
    --ytf-border: #e0e0e0;
    --ytf-radius: 12px;
    --ytf-shadow: 0 2px 12px rgba(0,0,0,0.08);
    --ytf-shadow-hover: 0 8px 24px rgba(0,0,0,0.12);
    --ytf-accent: #ff0000;
    --ytf-accent-hover: #cc0000;
    --ytf-overlay: linear-gradient(transparent 50%, rgba(0,0,0,0.8));
    --ytf-transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.ytf-wrapper {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, sans-serif;
    max-width: 100%;
    margin: 2rem 0;
    color: var(--ytf-text);
}

.ytf-wrapper * {
    box-sizing: border-box;
}

/* ============================================
   CHANNEL HEADER
   ============================================ */
.ytf-channel-header {
    background: var(--ytf-bg);
    border-radius: var(--ytf-radius);
    box-shadow: var(--ytf-shadow);
    padding: 1.5rem 2rem;
    margin-bottom: 1.25rem;
}

.ytf-channel-inner {
    display: flex;
    align-items: center;
    gap: 1.25rem;
}

.ytf-channel-avatar {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    object-fit: cover;
}

.ytf-channel-title {
    margin: 0 0 0.35rem;
    font-size: 1.4rem;
    font-weight: 700;
}

.ytf-channel-stats {
    display: flex;
    gap: 1rem;
    font-size: 0.875rem;
    color: var(--ytf-text-light);
}

.ytf-stat {
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

/* ============================================
   TOOLBAR (SEARCH + TABS)
   ============================================ */
.ytf-toolbar {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-bottom: 1.25rem;
}

/* Search */
.ytf-search-wrap {
    position: relative;
    max-width: 400px;
}

.ytf-search-input {
    width: 100%;
    padding: 0.6rem 1rem 0.6rem 2.5rem;
    border: 2px solid var(--ytf-border);
    border-radius: 8px;
    font-size: 0.9rem;
    background: var(--ytf-bg);
    transition: border-color var(--ytf-transition), box-shadow var(--ytf-transition);
    outline: none;
}

.ytf-search-input:focus {
    border-color: var(--ytf-accent);
    box-shadow: 0 0 0 3px rgba(255, 0, 0, 0.12);
}

.ytf-search-input::-webkit-input-placeholder { color: #aaa; }
.ytf-search-input::-moz-placeholder { color: #aaa; }

.ytf-search-icon {
    position: absolute;
    left: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    color: #aaa;
    pointer-events: none;
}

/* Playlist Tabs */
.ytf-playlist-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
}

.ytf-playlist-tabs::-webkit-scrollbar {
    display: none;
}

.ytf-tab {
    display: inline-flex;
    align-items: center;
    white-space: nowrap;
    padding: 0.5rem 1rem;
    border: 1.5px solid var(--ytf-border);
    background: var(--ytf-bg);
    color: var(--ytf-text-light);
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--ytf-transition);
}

.ytf-tab:hover {
    border-color: var(--ytf-accent);
    color: var(--ytf-text);
    background: #fff5f5;
}

.ytf-tab.active {
    background: var(--ytf-accent);
    border-color: var(--ytf-accent);
    color: #fff;
}

/* ============================================
   GRID LAYOUT
   ============================================ */
.ytf-grid {
    display: grid;
    grid-template-columns: repeat(var(--ytf-cols, 3), 1fr);
    gap: 1.25rem;
}

.ytf-video-card {
    background: var(--ytf-bg);
    border-radius: var(--ytf-radius);
    overflow: hidden;
    box-shadow: var(--ytf-shadow);
    transition: transform var(--ytf-transition), box-shadow var(--ytf-transition), opacity 0.5s ease, transform 0.5s ease;
    will-change: transform, opacity;
}

.ytf-video-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--ytf-shadow-hover);
}

.ytf-video-link {
    text-decoration: none;
    color: inherit;
    display: block;
}

.ytf-thumbnail-wrap {
    position: relative;
    aspect-ratio: 16 / 9;
    overflow: hidden;
    background: #000;
}

.ytf-thumbnail-wrap img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--ytf-transition), opacity var(--ytf-transition);
}

.ytf-video-card:hover .ytf-thumbnail-wrap img,
.ytf-list-item:hover .ytf-list-thumbnail img {
    transform: scale(1.05);
    opacity: 0.85;
}

.ytf-play-icon {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    opacity: 0.85;
    transition: opacity var(--ytf-transition), transform var(--ytf-transition);
    filter: drop-shadow(0 2px 8px rgba(0,0,0,0.3));
}

.ytf-video-link:hover .ytf-play-icon {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1.12);
}

.ytf-video-info {
    padding: 0.85rem 1rem;
}

.ytf-video-title {
    margin: 0 0 0.4rem;
    font-size: 0.95rem;
    font-weight: 600;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.ytf-video-meta {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    font-size: 0.8rem;
    color: var(--ytf-text-light);
}

.ytf-channel-name {
    font-size: 0.8rem;
    color: var(--ytf-text-light);
}

.ytf-video-desc {
    margin: 0.5rem 0 0;
    font-size: 0.8rem;
    color: var(--ytf-text-light);
    line-height: 1.5;
}

/* ============================================
   LIST LAYOUT
   ============================================ */
.ytf-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.ytf-list-item {
    background: var(--ytf-bg);
    border-radius: var(--ytf-radius);
    box-shadow: var(--ytf-shadow);
    overflow: hidden;
    transition: transform var(--ytf-transition), box-shadow var(--ytf-transition), opacity 0.5s ease, transform 0.5s ease;
    will-change: transform, opacity;
}

.ytf-list-item:hover {
    transform: translateX(4px);
    box-shadow: var(--ytf-shadow-hover);
}

.ytf-list-link {
    display: flex;
    gap: 1rem;
    text-decoration: none;
    color: inherit;
    padding: 0;
}

.ytf-list-thumbnail {
    position: relative;
    flex: 0 0 240px;
    aspect-ratio: 16 / 9;
    overflow: hidden;
    background: #000;
}

.ytf-list-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--ytf-transition);
}

.ytf-list-info {
    flex: 1;
    padding: 1rem 1rem 1rem 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
    min-width: 0;
}

.ytf-list-info .ytf-video-title {
    font-size: 1.05rem;
    -webkit-line-clamp: 1;
}

/* ============================================
   CAROUSEL LAYOUT
   ============================================ */
.ytf-carousel-wrapper {
    position: relative;
    overflow: hidden;
}

.ytf-carousel {
    overflow: hidden;
}

.ytf-carousel-track {
    display: flex;
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    gap: 1rem;
}

.ytf-carousel-slide {
    flex: 0 0 calc((100% - 2rem) / 3);
    min-width: 250px;
}

.ytf-carousel-slide .ytf-video-card {
    box-shadow: var(--ytf-shadow);
}

.ytf-carousel-nav {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    z-index: 10;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: none;
    background: rgba(255,255,255,0.95);
    box-shadow: 0 2px 8px rgba(0,0,0,0.15);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background var(--ytf-transition), box-shadow var(--ytf-transition);
    color: #333;
}

.ytf-carousel-nav:hover {
    background: #fff;
    box-shadow: 0 4px 12px rgba(0,0,0,0.25);
}

.ytf-prev { left: 8px; }
.ytf-next { right: 8px; }

.ytf-carousel-dots {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-top: 1rem;
}

.ytf-carousel-dots button {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    border: 2px solid var(--ytf-text-light);
    background: transparent;
    cursor: pointer;
    padding: 0;
    transition: background var(--ytf-transition), border-color var(--ytf-transition);
}

.ytf-carousel-dots button.active {
    background: var(--ytf-accent);
    border-color: var(--ytf-accent);
}

/* ============================================
   GALLERY LAYOUT
   ============================================ */
.ytf-gallery {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-auto-rows: 200px;
    gap: 10px;
}

.ytf-gallery-item {
    position: relative;
    overflow: hidden;
    border-radius: 8px;
    cursor: pointer;
    transition: opacity 0.5s ease, transform 0.5s ease;
    will-change: transform, opacity;
}

.ytf-gallery-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--ytf-transition);
}

.ytf-gallery-item:hover img {
    transform: scale(1.08);
}

.ytf-gallery-featured {
    grid-column: 1 / 3;
    grid-row: 1 / 3;
}

.ytf-gallery-overlay {
    position: absolute;
    inset: 0;
    background: var(--ytf-overlay);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    opacity: 0;
    transition: opacity var(--ytf-transition);
    padding: 1rem;
}

.ytf-gallery-item:hover .ytf-gallery-overlay {
    opacity: 1;
}

.ytf-gallery-overlay .ytf-video-title {
    color: #fff;
    text-align: center;
    font-size: 1rem;
}

.ytf-gallery-info {
    text-align: center;
}

.ytf-gallery-info .ytf-views {
    color: #ccc;
    font-size: 0.8rem;
}

/* ============================================
   LIGHTBOX
   ============================================ */
.ytf-lightbox {
    position: fixed;
    inset: 0;
    z-index: 999999;
    background: rgba(0,0,0,0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

.ytf-lightbox.active {
    opacity: 1;
    visibility: visible;
}

.ytf-lightbox-content {
    position: relative;
    width: 90%;
    max-width: 900px;
    aspect-ratio: 16 / 9;
}

.ytf-lightbox-player {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #000;
    border-radius: 8px;
}

.ytf-lightbox-player iframe {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    border: none;
    border-radius: 8px;
}

.ytf-lightbox-close {
    position: absolute;
    top: -40px;
    right: 0;
    background: none;
    border: none;
    color: #fff;
    font-size: 2rem;
    cursor: pointer;
    padding: 4px 12px;
    line-height: 1;
    opacity: 0.8;
    transition: opacity var(--ytf-transition);
}

.ytf-lightbox-close:hover {
    opacity: 1;
}

/* ============================================
   LOAD MORE
   ============================================ */
.ytf-loadmore-wrap {
    text-align: center;
    margin-top: 1.5rem;
}

.ytf-loadmore-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 2rem;
    background: var(--ytf-bg);
    color: var(--ytf-text);
    border: 2px solid var(--ytf-border);
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--ytf-transition);
}

.ytf-loadmore-btn:hover {
    border-color: var(--ytf-accent);
    background: #fff5f5;
    color: var(--ytf-accent);
}

.ytf-loadmore-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.ytf-loadmore-status {
    display: inline-block;
    margin-left: 0.75rem;
    font-size: 0.85rem;
    color: var(--ytf-text-light);
}

.ytf-count-wrap {
    text-align: center;
    margin-top: 0.75rem;
    font-size: 0.8rem;
    color: var(--ytf-text-light);
}

.ytf-count-shown {
    font-weight: 700;
    color: var(--ytf-text);
}

/* ============================================
   LOADING SPINNER
   ============================================ */
.ytf-loading {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 3rem 0;
}

.ytf-spinner {
    width: 36px;
    height: 36px;
    border: 3px solid var(--ytf-border);
    border-top-color: var(--ytf-accent);
    border-radius: 50%;
    animation: ytf-spin 0.7s linear infinite;
}

@keyframes ytf-spin {
    to { transform: rotate(360deg); }
}

/* ============================================
   EMPTY / ERROR
   ============================================ */
.ytf-empty {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--ytf-text-light);
    font-size: 1.1rem;
    background: var(--ytf-bg);
    border-radius: var(--ytf-radius);
    box-shadow: var(--ytf-shadow);
}

.ytf-error {
    color: #d63638;
    padding: 1rem;
    background: #fcf0f1;
    border-radius: var(--ytf-radius);
    border-left: 4px solid #d63638;
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 1024px) {
    .ytf-grid { --ytf-cols: 2 !important; }
    .ytf-carousel-slide { flex: 0 0 calc((100% - 1rem) / 2); }
    .ytf-gallery { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    .ytf-grid { --ytf-cols: 2 !important; }
    .ytf-list-link { flex-direction: column; }
    .ytf-list-thumbnail { flex: unset; width: 100%; }
    .ytf-list-info { padding: 0 1rem 1rem; }
    .ytf-carousel-slide { flex: 0 0 100%; }
    .ytf-gallery { grid-template-columns: 1fr; grid-auto-rows: 180px; }
    .ytf-gallery-featured { grid-column: 1; grid-row: auto; }
    .ytf-channel-inner { flex-direction: column; text-align: center; }
    .ytf-channel-stats { justify-content: center; }
    .ytf-toolbar { gap: 0.5rem; }
    .ytf-search-wrap { max-width: 100%; }
}

@media (max-width: 480px) {
    .ytf-grid { --ytf-cols: 1 !important; }
    .ytf-playlist-tabs { gap: 4px; }
    .ytf-tab { padding: 0.4rem 0.75rem; font-size: 0.8rem; }
}