:root {
    --bg-primary: #0f0f0f;
    --bg-secondary: #212121;
    --bg-tertiary: #3d3d3d;
    --text-primary: #ffffff;
    --text-secondary: #aaaaaa;
    --accent-blue: #3ea6ff;
    --border-color: #303030;
}

body {
    margin: 0;
    font-family: 'Roboto', sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
}

.material-icons {
    color: var(--text-primary);
}

/* Header */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 24px;
    height: 56px;
    background-color: var(--bg-secondary);
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid var(--border-color);
}

.header__left, .header__right, .header__center {
    display: flex;
    align-items: center;
    gap: 20px;
}

.header__left i {
    cursor: pointer;
}

.header__logo {
    height: 25px;
    cursor: pointer;
}

.header__center {
    flex: 0.5;
    justify-content: center;
}

.header__center input {
    width: 100%;
    padding: 10px 12px;
    background-color: #121212;
    border: 1px solid var(--border-color);
    border-radius: 40px 0 0 40px;
    color: var(--text-primary);
    font-size: 16px;
}

.header__center input:focus {
    outline: 1px solid var(--accent-blue);
}

.header__center .search-button {
    padding: 7px 20px;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-left: none;
    border-radius: 0 40px 40px 0;
    cursor: pointer;
}

.header__right i {
    cursor: pointer;
}

/* Main Layout */
.main-layout {
    display: flex;
}

/* Sidebar */
.sidebar {
    width: 240px;
    padding-top: 20px;
    background-color: var(--bg-secondary);
    height: calc(100vh - 56px);
    position: sticky;
    top: 56px;
}

.sidebar__item {
    display: flex;
    align-items: center;
    padding: 0 24px;
    height: 40px;
    cursor: pointer;
    gap: 24px;
}

.sidebar__item:hover {
    background-color: var(--bg-tertiary);
}

.sidebar__item--active {
    background-color: var(--bg-tertiary);
}

.sidebar hr {
    border: 1px solid var(--border-color);
    margin: 10px 0;
}

/* Video Grid */
.content {
    flex-grow: 1;
    padding: 24px;
}

.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
}

.video-card {
    cursor: pointer;
}

.video-card__thumbnail {
    width: 100%;
    aspect-ratio: 16 / 9;
    background-color: var(--bg-tertiary);
    object-fit: cover;
    border-radius: 12px;
    margin-bottom: 12px;
}

.video-card__info {
    display: flex;
    gap: 12px;
}

.video-card__avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background-color: var(--bg-tertiary);
}

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

.video-card__title {
    font-size: 16px;
    font-weight: 500;
    margin: 0;
    color: var(--text-primary);
    line-height: 1.4;
}

.video-card__channel,
.video-card__stats {
    font-size: 14px;
    color: var(--text-secondary);
    margin: 4px 0 0 0;
}

/* Watch Page */
.watch-page-container {
    display: flex;
    gap: 24px;
}

.watch-page__main {
    flex: 1;
}

.watch-page__player {
    width: 100%;
    aspect-ratio: 16 / 9;
    background-color: black;
    border-radius: 12px;
}

.watch-page__title {
    font-size: 20px;
    margin: 16px 0;
}

.watch-page__actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text-secondary);
}

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

.channel-info img {
    width: 48px;
    height: 48px;
    border-radius: 50%;
}

.channel-info__meta span {
    display: block;
}

.channel-info__name {
    color: var(--text-primary);
    font-size: 16px;
}

.subscribe-button {
    background-color: var(--text-primary);
    color: var(--bg-primary);
    border: none;
    border-radius: 18px;
    padding: 10px 16px;
    font-weight: 500;
    cursor: pointer;
}

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

.action-button {
    display: flex;
    align-items: center;
    background-color: var(--bg-tertiary);
    border-radius: 18px;
    padding: 8px 16px;
    cursor: pointer;
    font-size: 14px;
}

.action-button i {
    margin-right: 6px;
}
.action-button.liked {
    color: var(--accent-blue);
}
.action-button.liked i {
    color: var(--accent-blue);
}

.watch-page__description {
    background-color: var(--bg-tertiary);
    padding: 12px;
    border-radius: 12px;
    margin-top: 16px;
    font-size: 14px;
    line-height: 1.5;
}

.watch-page__comments {
    margin-top: 24px;
}

.comment {
    display: flex;
    gap: 12px;
    margin-top: 16px;
}

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

.comment__body .author {
    font-weight: 500;
    font-size: 13px;
}
.comment__body .text {
    font-size: 14px;
}

.watch-page__sidebar {
    width: 400px;
}

.related-video-card {
    display: flex;
    gap: 8px;
    margin-bottom: 8px;
    cursor: pointer;
}
.related-video-card__thumbnail {
    width: 168px;
    height: 94px;
    object-fit: cover;
    border-radius: 8px;
    background-color: var(--bg-tertiary);
}
.related-video-card__meta {
    flex: 1;
}

.related-video-card__title {
    font-size: 14px;
    margin: 0 0 4px 0;
    line-height: 1.3;
}
.related-video-card__channel,
.related-video-card__stats {
    font-size: 12px;
    color: var(--text-secondary);
    margin: 0;
}