:root {
    --color-bg: #0f172a;
    --color-surface: #1e293b;
    --color-border: #334155;
    --color-text: #f1f5f9;
    --color-text-muted: #94a3b8;
    --color-primary: #3b82f6;
    --color-primary-hover: #2563eb;
    --color-accent: #2563eb;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --radius: 8px;
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
}

*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

@media (min-width: 768px) {
    .container {
        padding: 0 2rem;
    }
}

.site-header {
    border-bottom: 1px solid var(--color-border);
    background: var(--color-bg);
    position: sticky;
    top: 0;
    z-index: 100;
}

.site-header .container {
    display: flex;
    align-items: center;
    height: 60px;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary);
    text-decoration: none;
}

.nav-upload-wrapper {
    margin-left: auto;
    display: flex;
    align-items: center;
}

.nav-upload {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    color: var(--color-primary);
    text-decoration: none;
    margin-left: 1rem;
}

.nav-upload:hover {
    color: var(--color-primary-hover);
}

.nav-upload svg {
    flex-shrink: 0;
}

.hamburger {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 24px;
    height: 18px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
    margin-left: 1rem;
    flex-shrink: 0;
}

@media (max-width: 767px) {
    .hamburger {
        display: flex;
    }
}

.hamburger-line {
    display: block;
    width: 100%;
    height: 2px;
    background: var(--color-text);
    border-radius: 2px;
    transition: transform 0.2s, opacity 0.2s;
}

.hamburger.active .hamburger-line:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
}

.hamburger.active .hamburger-line:nth-child(2) {
    opacity: 0;
}

.hamburger.active .hamburger-line:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
}

.nav-menu {
    position: absolute;
    top: 100%;
    right: 1rem;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 0.5rem 0;
    min-width: 150px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: opacity 0.2s, transform 0.2s, visibility 0.2s;
    z-index: 101;
}

@media (min-width: 768px) {
    .nav-menu {
        display: none;
    }
}

.nav-menu.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    color: var(--color-text);
    text-decoration: none;
    transition: background-color 0.2s;
}

.nav-link:hover {
    background: var(--color-bg);
    color: var(--color-primary);
}

.nav-link svg {
    flex-shrink: 0;
}

.icon {
    display: inline-flex;
    vertical-align: middle;
    flex-shrink: 0;
}

.search-section {
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: 1rem 0;
}

.search-form {
    display: flex;
    gap: 0.5rem;
}

.search-input-wrapper {
    flex: 1;
    position: relative;
}

.search-icon {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-text-muted);
    pointer-events: none;
}

.search-input {
    width: 100%;
    padding: 0.75rem 1rem 0.75rem 2.75rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    font-family: var(--font-family);
    font-size: 1rem;
    background: var(--color-bg);
    color: var(--color-text);
    transition: border-color 0.2s, box-shadow 0.2s;
}

.search-input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

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

.search-btn {
    padding: 0.75rem 1.5rem;
    background: var(--color-primary);
    color: white;
    border: none;
    border-radius: var(--radius);
    font-family: var(--font-family);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.2s;
}

.search-btn:hover {
    background: var(--color-primary-hover);
}

.main-content {
    flex: 1;
    padding: 1.5rem 0;
}

.video-grid {
    display: grid;
    gap: 1.5rem;
    grid-template-columns: 1fr;
}

@media (min-width: 576px) {
    .video-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 992px) {
    .video-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.video-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    overflow: hidden;
    transition: transform 0.2s, box-shadow 0.2s;
    text-decoration: none;
    color: inherit;
    display: block;
}

.video-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.1);
}

.video-card:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

.video-thumb {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 9;
    overflow: hidden;
    background: var(--color-border);
}

.video-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.video-thumb .play-icon {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: rgba(59, 130, 246, 0.9);
    border-radius: 50%;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.2s, transform 0.2s;
}

.video-thumb .play-icon svg {
    color: white;
    width: 24px;
    height: 24px;
    margin-left: 2px;
}

.video-card:hover .play-icon {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1.1);
}

.video-duration {
    position: absolute;
    bottom: 0.5rem;
    right: 0.5rem;
    background: rgba(0, 0, 0, 0.8);
    color: white;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 500;
}

.video-info {
    padding: 1rem;
}

.video-title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.video-meta {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    display: flex;
    gap: 0.75rem;
    align-items: center;
}

.video-meta span {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
}

.video-meta svg {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
}

.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.375rem;
    margin-top: 2rem;
    flex-wrap: wrap;
}

.pagination-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 40px;
    height: 40px;
    padding: 0 0.75rem;
    border-radius: var(--radius);
    font-family: var(--font-family);
    font-size: 0.875rem;
    font-weight: 500;
    text-decoration: none;
    border: 1px solid var(--color-border);
    background: var(--color-bg);
    color: var(--color-text);
    transition: all 0.2s ease;
}

.pagination-link svg {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
    stroke-width: 2.5;
}

.pagination-link:hover {
    background: var(--color-surface);
    border-color: var(--color-primary);
    color: var(--color-primary);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.15);
}

.pagination-link:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

.pagination-nav {
    padding: 0 1rem;
    gap: 0.5rem;
}

.pagination-nav svg {
    width: 20px;
    height: 20px;
}

.pagination-current {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 40px;
    height: 40px;
    padding: 0 0.75rem;
    border-radius: var(--radius);
    font-family: var(--font-family);
    font-size: 0.875rem;
    font-weight: 600;
    background: var(--color-primary);
    color: white;
    box-shadow: 0 2px 8px rgba(59, 130, 246, 0.3);
}

.pagination-disabled {
    opacity: 0.5;
    pointer-events: none;
}

.video-player-container {
    max-width: 900px;
    margin: 0 auto;
}

.video-player-wrapper {
    position: relative;
    width: 100%;
    background: #000;
    border-radius: var(--radius);
    overflow: hidden;
}

.video-player-wrapper .video-js {
    width: 100% !important;
    height: 0 !important;
    padding-top: 56.25% !important;
    position: relative;
}

.video-js .vjs-tech {
    position: absolute !important;
    top: 0 !important;
    left: 0 !important;
    width: 100% !important;
    height: 100% !important;
    object-fit: contain !important;
    background: #000;
}

.video-js .vjs-poster {
    position: absolute !important;
    top: 0 !important;
    left: 0 !important;
    width: 100% !important;
    height: 100% !important;
    background-size: contain !important;
    background-position: center !important;
    background-color: #000 !important;
}

.video-details {
    margin-top: 1.5rem;
    padding-left: 0.5rem;
}

.video-details-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

@media (min-width: 768px) {
    .video-details-title {
        font-size: 1.5rem;
    }
}

.video-details-meta {
    color: var(--color-text-muted);
    font-size: 0.875rem;
    margin-bottom: 1rem;
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
}

.video-details-meta span {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
}

.video-details-meta svg {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}

.video-details-description {
    color: var(--color-text-muted);
    line-height: 1.7;
}

.video-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 0.75rem;
    margin-bottom: 0.75rem;
    max-height: 4.5rem;
    overflow: hidden;
}

.video-tag {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.25rem 0.625rem;
    background: transparent;
    border: 1px solid var(--color-border);
    border-radius: 9999px;
    font-size: 0.75rem;
    color: var(--color-text-muted);
    text-decoration: none;
    transition: all 0.15s ease;
    white-space: nowrap;
}

.video-tag:hover {
    background: rgba(59, 130, 246, 0.1);
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.video-tag .tag-name {
    font-weight: 500;
}

.video-tag .tag-count {
    background: rgba(255, 255, 255, 0.05);
    padding: 0.0625rem 0.3125rem;
    border-radius: 9999px;
    font-size: 0.625rem;
    opacity: 0.7;
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--color-primary);
    text-decoration: none;
    margin-bottom: 1rem;
    font-weight: 500;
}

.back-link svg {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

.back-link:hover {
    text-decoration: underline;
}

.no-results {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--color-text-muted);
}

.no-results h2 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
    color: var(--color-text);
}

.site-footer {
    border-top: 1px solid var(--color-border);
    margin-top: 2rem;
    padding: 1.5rem 0;
    text-align: center;
    color: var(--color-text-muted);
    font-size: 0.875rem;
}

.loading {
    text-align: center;
    padding: 2rem;
    color: var(--color-text-muted);
}

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

.video-card {
    animation: fadeIn 0.3s ease-out;
}

.video-card:nth-child(2) { animation-delay: 0.05s; }
.video-card:nth-child(3) { animation-delay: 0.1s; }
.video-card:nth-child(4) { animation-delay: 0.15s; }
.video-card:nth-child(5) { animation-delay: 0.2s; }
.video-card:nth-child(6) { animation-delay: 0.25s; }

.error-page {
    text-align: center;
    padding: 4rem 1rem;
}

.error-code {
    font-size: 8rem;
    font-weight: 900;
    color: var(--color-primary);
    line-height: 1;
    margin-bottom: 1rem;
}

@media (min-width: 768px) {
    .error-code {
        font-size: 12rem;
    }
}

.error-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
}

@media (min-width: 768px) {
    .error-title {
        font-size: 2rem;
    }
}

.error-message {
    color: var(--color-text-muted);
    margin-bottom: 2rem;
    font-size: 1rem;
}

.error-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 2rem;
    background: var(--color-primary);
    color: white;
    text-decoration: none;
    border-radius: var(--radius);
    font-weight: 500;
    transition: background-color 0.2s;
}

.error-btn svg {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

.error-btn:hover {
    background: var(--color-primary-hover);
}

.faq-page {
    max-width: 800px;
    margin: 0 auto;
}

.faq-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    margin-top: 1rem;
}

@media (min-width: 768px) {
    .faq-title {
        font-size: 2.5rem;
    }
}

.faq-subtitle {
    color: var(--color-text-muted);
    margin-bottom: 2rem;
    font-size: 1rem;
}

.faq-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.faq-item {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    overflow: hidden;
}

.faq-question {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 1.25rem;
    background: transparent;
    border: none;
    font-family: var(--font-family);
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text);
    text-align: left;
    cursor: pointer;
    transition: background-color 0.2s;
}

.faq-question:hover {
    background: var(--color-bg);
}

.faq-question span {
    padding-right: 1rem;
}

.faq-icon {
    flex-shrink: 0;
    transition: transform 0.2s ease;
}

.faq-question[aria-expanded="true"] .faq-icon {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, padding 0.3s ease;
}

.faq-answer.active {
    max-height: 500px;
    padding: 0 1.25rem 1.25rem;
}

.faq-answer p {
    color: var(--color-text);
    line-height: 1.7;
    margin-bottom: 0.75rem;
}

.faq-answer p:last-child {
    margin-bottom: 0;
}

.faq-answer ul {
    color: var(--color-text);
    line-height: 1.7;
    margin: 0.5rem 0;
    padding-left: 1.5rem;
}

.faq-answer li {
    margin-bottom: 0.25rem;
}

.faq-answer strong {
    color: var(--color-primary);
}

.tag-filter-info {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin: 1rem 0;
}

.tag-filter-label {
    color: var(--color-text-muted);
    font-size: 0.875rem;
}

.tag-filter-clear {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.375rem 0.75rem;
    background: var(--color-primary);
    color: white;
    border-radius: 9999px;
    font-size: 0.875rem;
    font-weight: 500;
    text-decoration: none;
    transition: all 0.2s;
}

.tag-filter-clear:hover {
    background: var(--color-primary-hover);
}

.tag-filter-clear svg {
    width: 14px;
    height: 14px;
}

.skip-indicator {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.25rem;
    background: rgba(0, 0, 0, 0.7);
    border-radius: 50%;
    width: 60px;
    height: 60px;
    color: #fff;
    font-family: var(--font-family);
    font-size: 0.875rem;
    font-weight: 600;
    pointer-events: none;
    opacity: 0;
    animation: skipFadeIn 0.15s ease forwards;
    z-index: 100;
}

.skip-indicator svg {
    width: 24px;
    height: 24px;
}

.skip-indicator.skip-left {
    left: 15%;
}

.skip-indicator.skip-right {
    right: 15%;
}

@keyframes skipFadeIn {
    from {
        opacity: 0;
        transform: translateY(-50%) scale(1.2);
    }
    to {
        opacity: 1;
        transform: translateY(-50%) scale(1);
    }
}

.video-js.vjs-fullscreen {
    z-index: 9999;
}

.video-js.vjs-fullscreen .vjs-control-bar {
    z-index: 10000;
}

@media (max-width: 767px) {
    .video-js.vjs-fullscreen {
        position: fixed !important;
        top: 0 !important;
        left: 0 !important;
        width: 100% !important;
        height: 100% !important;
        padding-top: 0 !important;
    }
    
    .video-js.vjs-fullscreen .vjs-tech {
        position: absolute !important;
        top: 0 !important;
        left: 0 !important;
        width: 100% !important;
        height: 100% !important;
    }
    
    .video-js.vjs-fullscreen .vjs-control-bar {
        position: fixed !important;
        bottom: 0 !important;
        left: 0 !important;
        right: 0 !important;
        opacity: 1 !important;
        visibility: visible !important;
    }
    
    .video-js.vjs-fullscreen .vjs-big-play-button {
        z-index: 10001 !important;
    }
}