:root {
    --yt-white: #ffffff;
    --yt-black: #030303;
    --yt-gray-text: #606060;
    --yt-hover: #f2f2f2;
    --yt-border: #e5e5e5;
    --yt-red: #ff0000;
    --sidebar-width: 240px;
    --sidebar-collapsed-width: 72px;
    --header-height: 56px;
    --transition: all 0.2s cubic-bezier(0.05, 0, 0, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Roboto", "Arial", sans-serif;
}

body {
    background-color: var(--yt-white);
    color: var(--yt-black);
    overflow-x: hidden;
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: #717171;
    border-radius: 10px;
}

::-webkit-scrollbar-thumb:hover {
    background: #888;
}

/* Header */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    background-color: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 16px;
    z-index: 1000;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.header-left {
    display: flex;
    align-items: center;
    gap: 16px;
}

.menu-btn {
    background: none;
    border: none;
    color: var(--yt-black);
    font-size: 20px;
    cursor: pointer;
    padding: 8px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.menu-btn:hover {
    background-color: var(--yt-hover);
}

.logo {
    display: flex;
    align-items: center;
    gap: 4px;
    cursor: pointer;
    text-decoration: none;
    color: var(--yt-black);
}

.logo i {
    color: var(--yt-red);
    font-size: 28px;
}

.logo-text {
    font-family: 'Oswald', 'Roboto Condensed', 'Arial Narrow', sans-serif;
    font-weight: 700;
    font-size: 21px;
    letter-spacing: -1px;
    position: relative;
    display: inline-flex;
}

.logo-es {
    position: absolute;
    top: 0;
    left: 100%;
    margin-left: 2px;
    font-size: 10px;
    color: #606060;
    font-weight: 400;
    font-family: Roboto, sans-serif;
}

.header-center {
    flex: 0 1 720px;
    display: flex;
    align-items: center;
    gap: 16px;
}

.search-container {
    display: flex;
    flex: 1;
    align-items: center;
}

.search-box {
    flex: 1;
    background-color: white;
    border: 1px solid var(--yt-border);
    border-right: none;
    border-radius: 40px 0 0 40px;
    padding: 0 16px;
    height: 40px;
    display: flex;
    align-items: center;
    transition: border-color 0.2s;
}

.search-box:focus-within {
    border-color: #1c62b9;
    box-shadow: inset 0 1px 2px rgba(0,0,0,0.3);
}

.search-box input {
    background: none;
    border: none;
    color: var(--yt-black);
    width: 100%;
    font-size: 16px;
    outline: none;
}

.search-btn {
    background-color: #f8f8f8;
    border: 1px solid var(--yt-border);
    border-radius: 0 40px 40px 0;
    width: 64px;
    height: 40px;
    cursor: pointer;
    color: var(--yt-black);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
}

.mic-btn {
    background-color: #f2f2f2;
    border: none;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    color: var(--yt-black);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
}

.mic-btn:hover {
    background-color: var(--yt-hover);
}

.header-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

.create-btn {
    background-color: #f2f2f2;
    border: none;
    height: 36px;
    padding: 0 16px;
    border-radius: 18px;
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 500;
    font-size: 14px;
    cursor: pointer;
    font-family: Roboto, sans-serif;
    color: var(--yt-black);
}

.create-btn:hover {
    background-color: #e5e5e5;
}

.icon-btn {
    background: none;
    border: none;
    color: var(--yt-black);
    font-size: 20px;
    cursor: pointer;
    padding: 8px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.icon-btn:hover {
    background-color: var(--yt-hover);
}

.user-profile {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    overflow: hidden;
    margin-left: 8px;
    cursor: pointer;
}

.user-profile img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* Sidebar */
.main-container {
    display: flex;
    padding-top: var(--header-height);
    height: 100vh;
}

.sidebar {
    width: var(--sidebar-width);
    height: calc(100vh - var(--header-height));
    overflow-y: auto;
    background-color: var(--yt-white);
    padding: 12px;
    transition: var(--transition);
    flex-shrink: 0;
}

.sidebar.collapsed {
    width: var(--sidebar-collapsed-width);
    padding: 4px;
}

.sidebar-item {
    display: flex;
    align-items: center;
    padding: 10px 12px;
    border-radius: 10px;
    cursor: pointer;
    text-decoration: none;
    color: var(--yt-black);
    gap: 24px;
    margin-bottom: 2px;
}

.sidebar-item:hover {
    background-color: var(--yt-hover);
}

.sidebar-item.active {
    background-color: var(--yt-hover);
    font-weight: 500;
}

.sidebar-item i {
    font-size: 20px;
    width: 24px;
    text-align: center;
}

.sidebar-item span {
    font-size: 14px;
    white-space: nowrap;
    overflow: hidden;
}

.sidebar.collapsed .sidebar-item {
    flex-direction: column;
    gap: 4px;
    padding: 16px 0;
    align-items: center;
}

.sidebar.collapsed .sidebar-item i {
    font-size: 22px;
}

.sidebar.collapsed .sidebar-item span {
    font-size: 10px;
}

.sidebar-section {
    border-top: 1px solid var(--yt-border);
    margin: 12px 0;
    padding-top: 12px;
}

.sidebar-title {
    padding: 0 12px 8px;
    font-size: 16px;
    font-weight: 500;
}

/* Main Content */
.content {
    flex: 1;
    overflow-y: auto;
    padding: 24px;
}

.chips-container {
    background-color: var(--yt-white);
    padding-bottom: 24px;
    display: flex;
    gap: 12px;
    overflow-x: auto;
    white-space: nowrap;
}

.chips-container::-webkit-scrollbar {
    display: none;
}

.chip {
    background-color: rgba(0, 0, 0, 0.05);
    color: var(--yt-black);
    padding: 6px 12px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    flex-shrink: 0;
    transition: background-color 0.2s;
}

.chip:hover {
    background-color: #3f3f3f;
}

.chip.active {
    background-color: var(--yt-black);
    color: white;
}

/* Video Grid */
.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 16px;
    padding-top: 8px;
}

.video-card {
    cursor: pointer;
    transition: transform 0.2s;
}

.thumbnail-container {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 9;
    border-radius: 12px;
    overflow: hidden;
    background-color: #333;
}

.thumbnail-container img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.duration {
    position: absolute;
    bottom: 8px;
    right: 8px;
    background-color: rgba(0, 0, 0, 0.8);
    color: white;
    padding: 2px 4px;
    border-radius: 4px;
    font-size: 12px;
    font-weight: 500;
}

.video-info {
    display: flex;
    margin-top: 12px;
    gap: 12px;
}

.channel-icon {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    overflow: hidden;
    flex-shrink: 0;
}

.channel-icon img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.video-details {
    display: flex;
    flex-direction: column;
}

.video-title {
    font-size: 16px;
    font-weight: 500;
    line-height: 1.4;
    color: var(--yt-black);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin-bottom: 4px;
}

.channel-name, .video-meta {
    font-size: 14px;
    color: var(--yt-gray-text);
}

.channel-name:hover {
    color: var(--yt-black);
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.video-card {
    animation: fadeIn 0.4s ease forwards;
}

.video-card:hover .thumbnail-container {
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.5);
    transform: scale(1.02);
}

.thumbnail-container {
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes pulse {
    0% { box-shadow: 0 0 0 0 rgba(28, 98, 185, 0.4); }
    70% { box-shadow: 0 0 0 10px rgba(28, 98, 185, 0); }
    100% { box-shadow: 0 0 0 0 rgba(28, 98, 185, 0); }
}

.mic-btn:hover {
    background-color: var(--yt-hover);
    animation: pulse 1.5s infinite;
}

/* Watch Page Styles */
.watch-page {
    flex: 1;
    height: calc(100vh - var(--header-height));
    overflow-y: auto;
    background-color: var(--yt-white);
    padding: 24px 72px 0 24px;
}

.watch-container {
    display: flex;
    gap: 24px;
    max-width: 1700px;
    margin: 0 auto;
}

.watch-left {
    flex: 1;
    min-width: 0;
}

.player-container {
    width: 100%;
    aspect-ratio: 16 / 9;
    background-color: black;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.player-container iframe {
    width: 100%;
    height: 100%;
}

.watch-info h1 {
    font-size: 20px;
    margin: 12px 0;
    line-height: 1.4;
}

.watch-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
    flex-wrap: wrap;
    gap: 16px;
}

.channel-wrapper {
    display: flex;
    align-items: center;
    gap: 12px;
}

.channel-details {
    display: flex;
    flex-direction: column;
}

.channel-details .channel-name {
    font-weight: 500;
    font-size: 16px;
}

.channel-details .subs-count {
    color: var(--yt-gray-text);
    font-size: 12px;
}

.subscribe-btn {
    background-color: var(--yt-black);
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 20px;
    font-weight: 500;
    cursor: pointer;
    margin-left: 12px;
    transition: transform 0.2s;
}

.subscribe-btn:hover {
    transform: scale(1.05);
    background-color: #333;
}

.subscribe-btn.subscribed {
    background-color: #f2f2f2;
    color: var(--yt-black);
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 14px;
}

.subscribe-btn.subscribed:hover {
    transform: scale(1.02);
    background-color: #e5e5e5;
}

.action-buttons {
    display: flex;
    gap: 8px;
}

.like-dislike {
    display: flex;
    background-color: #f2f2f2;
    border-radius: 20px;
    overflow: hidden;
}

.action-btn {
    background-color: #f2f2f2;
    border: none;
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
}

.action-btn:hover {
    background-color: #e5e5e5;
}

.like-dislike .action-btn {
    border-radius: 0;
    position: relative;
}

.like-dislike .action-btn:first-child::after {
    content: "";
    position: absolute;
    right: 0;
    top: 20%;
    height: 60%;
    width: 1px;
    background-color: #ccc;
}

.video-description {
    background-color: #f2f2f2;
    border-radius: 12px;
    padding: 12px;
    margin-top: 12px;
    font-size: 14px;
}

#watchDesc {
    overflow: hidden;
    display: -webkit-box;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 3;
    line-clamp: 3;
}

#watchDesc.expanded {
    -webkit-line-clamp: unset;
    line-clamp: unset;
}

.desc-meta {
    font-weight: 500;
    margin-bottom: 8px;
    display: block;
}

.desc-meta span {
    margin-right: 8px;
}

.show-more {
    font-weight: 500;
    cursor: pointer;
    display: block;
    margin-top: 8px;
}

.watch-right {
    width: 400px;
    flex-shrink: 0;
}

/* Related Videos on Watch Page */
.related-video-card {
    display: flex;
    gap: 12px;
    margin-bottom: 12px;
    cursor: pointer;
}

.related-video-card .thumbnail-container {
    width: 168px;
    flex-shrink: 0;
}

.related-video-card .video-title {
    font-size: 14px;
    margin-bottom: 4px;
}

.related-video-card .channel-name, 
.related-video-card .video-meta {
    font-size: 12px;
}

.comments-section {
    margin-top: 24px;
}

.add-comment {
    display: flex;
    gap: 16px;
    margin-top: 16px;
    align-items: center;
}

.add-comment img {
    width: 40px;
    height: 40px;
    border-radius: 50%;
}

.add-comment input {
    flex: 1;
    border: none;
    border-bottom: 1px solid #ccc;
    padding: 8px 0;
    outline: none;
    background: transparent;
}

.add-comment input:focus {
    border-bottom: 2px solid black;
}

/* Responsive */
@media (max-width: 1700px) {
    .watch-page {
        padding: 24px;
    }
}

@media (max-width: 1200px) {
    .sidebar {
        width: var(--sidebar-collapsed-width);
        padding: 4px;
    }
    .sidebar .sidebar-item {
        flex-direction: column;
        gap: 4px;
        padding: 16px 0;
        align-items: center;
    }
    .sidebar .sidebar-item i {
        font-size: 22px;
    }
    .sidebar .sidebar-item span {
        font-size: 10px;
    }
    .sidebar-title, .sidebar-section {
        display: none;
    }
}

@media (max-width: 1000px) {
    .watch-container {
        flex-direction: column;
    }
    .watch-right {
        width: 100%;
    }
    .watch-page {
        padding: 12px;
    }
}

@media (max-width: 792px) {
    header .header-center {
        display: none;
    }
    .video-grid {
        grid-template-columns: 1fr;
    }
}