:root {
    --accent-color: #6366f1;
    --bg-primary: #0a0a0a;
    --bg-secondary: #1a1a1a;
    --bg-tertiary: #2a2a2a;
    --text-primary: #ffffff;
    --text-secondary: #a0a0a0;
    --text-size: 16px; 
    --grid-columns: 5; 
    --border-radius: 8px; 
    --card-padding: 12px;
    --thumbnail-aspect-ratio: 16 / 9; 
    --header-height: 60px; 
}

body {
    font-family: 'Inter', sans-serif;
    margin: 0;
    padding: 0;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-size: var(--text-size);
    overflow-x: hidden;
}

.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.main-content {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    padding: 20px;
    padding-top: calc(var(--header-height) + 20px); 
    width: 98%;
    box-sizing: border-box;
    margin: 0 auto; 
}

.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: rgba(10, 10, 10, 0.95); 
    backdrop-filter: blur(8px); 
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 20px;
    height: var(--header-height); 
    box-sizing: border-box;
    border-bottom: 1px solid var(--bg-tertiary);
}

.header-left,
.header-center,
.header-right {
    display: flex;
    align-items: center;
}

.logo {
    font-size: 24px;
    font-weight: 700;
    color: var(--accent-color);
    margin: 0;
    display: flex;
    align-items: center;
    cursor: pointer; 
}

.logo i {
    margin-right: 8px;
}

.search-container {
    display: flex;
    align-items: center;
    background-color: var(--bg-secondary);
    border-radius: var(--border-radius);
    overflow: visible; 
    width: 400px;
    max-width: 100%;
    position: relative; 
    z-index: 500; 
}

#search-form {
    display: flex;
    width: 100%;
    border-radius: var(--border-radius);
    overflow: hidden;
}

.search-input {
    flex-grow: 1;
    padding: 10px 15px;
    border: none;
    background: none;
    color: var(--text-primary);
    font-size: 1em;
    outline: none;
}

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

.search-btn {
    padding: 10px 15px;
    background-color: var(--bg-tertiary);
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    transition: background-color 0.2s ease;
    flex-shrink: 0; 
}

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

.search-suggestions {
    position: absolute;
    top: 100%; 
    left: 0;
    right: 0;
    background-color: var(--bg-tertiary);
    border-radius: var(--border-radius);
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
    overflow: hidden;
    max-height: 250px; 
    overflow-y: auto;
    display: none; 
    padding: 5px 0; 
}

.search-suggestions.visible {
    display: block;
}

.suggestion-item {
    padding: 10px 15px;
    cursor: pointer;
    color: var(--text-primary);
    font-size: 0.95em;
    transition: background-color 0.2s ease;
    display: block; 
    text-decoration: none; 
}

.suggestion-item:hover {
    background-color: var(--bg-secondary);
}

.suggestion-item strong {
    color: var(--accent-color); 
    font-weight: 600;
}

.settings-toggle {
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.5em;
    cursor: pointer;
    padding: 10px;
    transition: color 0.2s ease, transform 0.2s ease;
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
}

.settings-toggle:hover {
    color: var(--accent-color);
}

.settings-icon {
    transition: transform 0.3s ease;
}

.settings-toggle:hover .settings-icon {
    transform: rotate(90deg);
}

.trending-tags-container {
    margin-top: 10px; 
    margin-bottom: 20px; 
    display: flex;
    flex-wrap: wrap; 
    gap: 10px; 
    padding: 10px 0; 
}

.tag-button {
    background-color: var(--bg-secondary);
    color: var(--text-secondary);
    border: 1px solid var(--bg-secondary);
    border-radius: 20px; 
    padding: 6px 15px;
    font-size: 0.9em;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    text-decoration: none;
    display: inline-block;
}

.tag-button:hover {
    background-color: var(--accent-color);
    border-color: var(--accent-color);
    color: var(--text-primary);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

.tag-button:active {
    transform: translateY(0);
    box-shadow: 0 2px 6px rgba(99, 102, 241, 0.2);
}

.video-grid {
    display: grid;
    grid-template-columns: repeat(var(--grid-columns), 1fr);
    gap: 20px;
    margin-top: 0; 
    opacity: 0; 
    animation: fadeIn 0.5s ease forwards;
}

@keyframes fadeIn {
    to {
        opacity: 1;
    }
}

.video-card {
    background-color: var(--bg-secondary);
    border-radius: var(--border-radius);
    overflow: hidden;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    display: flex;
    flex-direction: column; 
    animation: fadeInUp 0.5s ease forwards; 
    opacity: 0; 
    transform: translateY(20px);
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.video-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 15px rgba(0, 0, 0, 0.3);
}

.video-card a {
    text-decoration: none;
    color: inherit;
}

.video-thumbnail {
    width: 100%;
    display: block; 
    object-fit: cover; 
    aspect-ratio: var(--thumbnail-aspect-ratio);
}

.video-info {
    padding: var(--card-padding);
    display: flex;
    flex-direction: column;
    justify-content: space-between; 
    flex-grow: 1; 
}

.video-title {
    font-size: 1em; 
    font-weight: 600;
    margin: 0 0 8px 0;
    color: var(--text-primary);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    text-overflow: ellipsis;
}

.video-channel {
    font-size: 0.9em; 
    color: var(--text-secondary);
    margin: 0 0 4px 0;
}

.video-stats {
    font-size: 0.8em; 
    color: var(--text-secondary);
    margin-top: auto; 
}

.video-stats span:not(:last-child) {
    margin-right: 4px;
}

.video-duration {
    background-color: rgba(0, 0, 0, 0.8);
    color: white;
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.8em;
    font-weight: bold;
}

.no-results {
    grid-column: 1 / -1; 
    text-align: center;
    color: var(--text-secondary);
    font-size: 1.2em;
    padding: 40px;
}

.settings-panel {
    position: fixed;
    top: 0;
    right: 0;
    height: 100%;
    width: 350px;
    background-color: var(--bg-tertiary);
    box-shadow: -5px 0 15px rgba(0, 0, 0, 0.5);
    z-index: 2000;
    transform: translateX(100%);
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    flex-direction: column;
}

.settings-panel.open {
    transform: translateX(0);
}

.settings-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
    border-bottom: 1px solid var(--bg-secondary);
    flex-shrink: 0; 
}

.settings-header h2 {
    margin: 0;
    font-size: 1.2em;
    color: var(--text-primary);
    display: flex;
    align-items: center;
}

.settings-header h2 i {
    margin-right: 10px;
    color: var(--accent-color);
}

.close-settings {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1.5em;
    cursor: pointer;
    transition: color 0.2s ease;
}

.close-settings:hover {
    color: var(--text-primary);
}

.settings-content {
    padding: 20px;
    overflow-y: auto; 
    flex-grow: 1; 
}

.setting-group {
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 1px dashed var(--bg-secondary);
}

.setting-group:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.setting-label {
    display: block;
    font-size: 1em; 
    color: var(--text-primary);
    margin-bottom: 10px;
    font-weight: 500;
    display: flex;
    align-items: center;
}

.setting-label i {
    margin-right: 8px;
    color: var(--accent-color);
}

.slider-container {
    display: flex;
    align-items: center;
    gap: 10px;
}

.power-slider {
    flex-grow: 1;
    -webkit-appearance: none;
    appearance: none;
    height: 8px;
    background: var(--bg-secondary);
    outline: none;
    opacity: 0.9;
    transition: opacity 0.2s;
    border-radius: 4px;
}

.power-slider:hover {
    opacity: 1;
}

.power-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    background: var(--accent-color);
    cursor: pointer;
    border-radius: 50%;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
}

.power-slider::-moz-range-thumb {
    width: 20px;
    height: 20px;
    background: var(--accent-color);
    cursor: pointer;
    border-radius: 50%;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
}

.slider-value {
    font-size: 0.9em; 
    color: var(--text-secondary);
    min-width: 45px; 
    text-align: right;
}

.button-group {
    display: flex;
    gap: 8px;
}

.grid-btn {
    padding: 8px 12px;
    background-color: var(--bg-secondary);
    border: 1px solid var(--bg-secondary);
    color: var(--text-secondary);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease;
    font-size: 0.9em;
}

.grid-btn.active,
.grid-btn:hover {
    background-color: var(--accent-color);
    border-color: var(--accent-color);
    color: var(--text-primary);
}

.reset-btn {
    display: block;
    width: 100%;
    padding: 12px;
    background-color: #dc2626; 
    border: none;
    color: var(--text-primary);
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 1em;
    font-weight: 500;
    transition: background-color 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.reset-btn i {
    margin-right: 8px;
}

.reset-btn:hover {
    background-color: #ef4444; 
}

.pagination-container {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-top: 30px;
    gap: 10px;
}

.pagination-btn {
    background-color: var(--bg-secondary);
    border: none;
    color: var(--text-secondary);
    padding: 10px 15px;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: background-color 0.2s ease, color 0.2s ease;
}

.pagination-btn:hover:not(:disabled) {
    background-color: var(--accent-color);
    color: var(--text-primary);
}

.pagination-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.pagination-dots {
    display: flex;
    align-items: center;
    gap: 5px;
}

.pagination-dot {
    background-color: var(--bg-secondary);
    color: var(--text-secondary);
    width: 30px;
    height: 30px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    transition: background-color 0.2s ease, color 0.2s ease;
    font-size: 0.9em;
}

.pagination-dot.active {
    background-color: var(--accent-color);
    color: var(--text-primary);
    font-weight: 600;
    cursor: default;
}

.pagination-dot:hover:not(.active):not(.ellipsis) {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
}

.pagination-dot.ellipsis {
    background: none;
    color: var(--text-secondary);
    cursor: default;
}

.footer {
    background-color: var(--bg-secondary);
    padding: 40px 20px 20px 20px;
    margin-top: 40px;
    color: var(--text-secondary);
    font-size: 0.9em;
}

.footer-content {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    width: 98%;
    margin: 0 auto;
    gap: 30px;
}

.footer-section {
    flex: 1;
    min-width: 200px;
}

.footer-section h3,
.footer-section h4 {
    color: var(--text-primary);
    margin-top: 0;
    margin-bottom: 15px;
}

.footer-section ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-section ul li {
    margin-bottom: 8px;
}

.footer-section a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.2s ease;
}

.footer-section a:hover {
    color: var(--accent-color);
}

.footer-bottom {
    text-align: center;
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid var(--bg-tertiary);
}

/* Responsive Design */
@media (max-width: 1200px) {
    :root {
        --grid-columns: 4;
    }
}

@media (max-width: 992px) {
    :root {
        --grid-columns: 3;
    }
}

@media (max-width: 768px) {
    :root {
        --grid-columns: 2;
    }
}

@media (max-width: 480px) {
    :root {
        --grid-columns: 1;
    }
    
    .header {
        flex-direction: column;
        height: auto;
        padding: 10px;
        gap: 10px;
    }
    
    .header-left {
        width: 100%;
        justify-content: center;
        order: 1;
        margin-bottom: 5px;
    }
    
    .header-center {
        display: flex;
        align-items: center;
        width: 100%;
        order: 2;
        flex: 1;
    }
    
    .header-right {
        display: flex;
        align-items: center;
        order: 2;
        margin-left: 15px;
        flex-shrink: 0;
    }
    
    .search-container {
        flex: 1;
        max-width: none;
        width: auto;
    }
    
    .main-content {
        padding-top: 110px;
        padding-left: 10px;
        padding-right: 10px;
    }
    
    .trending-tags-container {
        justify-content: center;
    }
    
    .settings-panel {
        width: 100%;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
    
    .video-grid {
        gap: 15px;
    }
    
    .tag-button {
        font-size: 0.8em;
        padding: 4px 12px;
    }
}

/* Video tags styling */
.video-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 15px;
    padding: 15px 0;
    border-top: 1px solid var(--bg-tertiary);
}

.video-tag {
    background: linear-gradient(135deg, var(--bg-secondary), var(--bg-tertiary));
    color: var(--text-secondary);
    border: 1px solid transparent;
    border-radius: 16px;
    padding: 4px 12px;
    font-size: 0.8em;
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.video-tag::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transition: left 0.5s ease;
}

.video-tag:hover {
    background: linear-gradient(135deg, var(--accent-color), #7c3aed);
    border-color: var(--accent-color);
    color: var(--text-primary);
    transform: translateY(-1px) scale(1.05);
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.4);
}

.video-tag:hover::before {
    left: 100%;
}

.video-tag:active {
    transform: translateY(0) scale(1.02);
    box-shadow: 0 2px 8px rgba(99, 102, 241, 0.3);
}

.video-tag i {
    font-size: 0.7em;
    opacity: 0.8;
}

/* Tag container styling */
.tags-container {
    margin: 20px 0;
}

.tags-label {
    color: var(--text-primary);
    font-weight: 600;
    font-size: 0.9em;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.tags-label i {
    color: var(--accent-color);
    font-size: 0.9em;
}

/* Animation delays for staggered effect */
.video-card:nth-child(1) { animation-delay: 0.1s; }
.video-card:nth-child(2) { animation-delay: 0.2s; }
.video-card:nth-child(3) { animation-delay: 0.3s; }
.video-card:nth-child(4) { animation-delay: 0.4s; }
.video-card:nth-child(5) { animation-delay: 0.5s; }
.video-card:nth-child(6) { animation-delay: 0.6s; }

/* Scroll to Top Button */
.scroll-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--accent-color), #7c3aed);
    border: none;
    border-radius: 50%;
    color: var(--text-primary);
    font-size: 1.2em;
    cursor: pointer;
    z-index: 1500;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px) scale(0.8);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.3);
    display: flex;
    align-items: center;
    justify-content: center;
}

.scroll-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
}

.scroll-to-top:hover {
    background: linear-gradient(135deg, #7c3aed, var(--accent-color));
    transform: translateY(-2px) scale(1.05);
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.4);
}

.scroll-to-top:active {
    transform: translateY(0) scale(0.95);
    box-shadow: 0 2px 10px rgba(99, 102, 241, 0.3);
}

.scroll-to-top i {
    transition: transform 0.2s ease;
}

.scroll-to-top:hover i {
    transform: translateY(-2px);
}