:root {
    --primary-color: #ff0000;
    --secondary-color: #282828;
    --background-color: #0f0f0f;
    --surface-color: #272727;
    --text-primary: #ffffff;
    --text-secondary: #aaaaaa;
    --hover-color: #383838;
    --card-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    --transition: all 0.3s ease;
}

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

body {
    background-color: var(--background-color);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 100%;
    margin: 0 auto;
}

header {
    background-color: var(--background-color);
    padding: 0 16px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid var(--surface-color);
}

.logo {
    display: flex;
    align-items: center;
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
}

.logo i {
    color: var(--primary-color);
    margin-right: 5px;
}

.mobile-menu {
    display: flex;
    align-items: center;
}

.mobile-menu i {
    font-size: 20px;
    margin-left: 16px;
    cursor: pointer;
}

.main-content {
    padding: 16px;
    overflow-y: auto;
}

.section-title {
    font-size: 20px;
    margin-bottom: 16px;
    font-weight: 500;
    text-align: center;
}

.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 16px;
    margin-bottom: 20px;
}

.video-card {
    cursor: pointer;
    transition: var(--transition);
}

.video-card:hover {
    transform: translateY(-5px);
}

.thumbnail-container {
    position: relative;
    width: 100%;
    height: 0;
    padding-bottom: 56.25%;
    border-radius: 12px;
    overflow: hidden;
    background-color: var(--surface-color);
    margin-bottom: 12px;
}

.thumbnail {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.video-card:hover .thumbnail {
    transform: scale(1.05);
}

.video-duration {
    position: absolute;
    bottom: 8px;
    right: 8px;
    background-color: rgba(0, 0, 0, 0.8);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 12px;
}

.video-info {
    display: flex;
}

.channel-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background-color: var(--primary-color);
    margin-right: 12px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 14px;
}

.video-details {
    flex: 1;
}

.video-title {
    font-size: 16px;
    font-weight: 500;
    margin-bottom: 4px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.video-meta {
    font-size: 14px;
    color: var(--text-secondary);
}

.video-meta span {
    display: inline-block;
    margin-right: 4px;
}

.video-player-container {
    display: none;
    padding: 0;
}

.video-player-layout {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.player-main {
    flex: 1;
}

.player-video {
    width: 100%;
    height: 0;
    padding-bottom: 56.25%;
    background-color: #000;
    overflow: hidden;
    position: relative;
}

.player-video video {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.player-content {
    padding: 16px;
}

.player-title {
    font-size: 18px;
    font-weight: 500;
    margin: 12px 0;
}

.player-actions {
    display: flex;
    justify-content: space-between;
    border-bottom: 1px solid var(--surface-color);
    padding-bottom: 16px;
    margin-bottom: 16px;
}

.player-stats {
    display: flex;
    align-items: center;
    color: var(--text-secondary);
    font-size: 14px;
}

.player-stats span {
    margin-right: 16px;
}

.player-buttons {
    display: flex;
    align-items: center;
}

.player-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    margin-left: 16px;
    cursor: pointer;
    font-size: 14px;
    transition: var(--transition);
}

.player-btn i {
    margin-right: 6px;
    font-size: 16px;
}

.player-btn:hover {
    color: var(--text-primary);
}

.download-btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 12px 20px;
    border-radius: 4px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    margin: 16px 0;
    font-size: 16px;
}

.download-btn i {
    margin-right: 8px;
    font-size: 18px;
}

.download-btn:hover {
    background-color: #cc0000;
}

.channel-info {
    display: flex;
    align-items: center;
    margin-bottom: 16px;
}

.channel-details {
    flex: 1;
    margin-left: 12px;
}

.channel-name {
    font-weight: 500;
    margin-bottom: 4px;
}

.channel-subs {
    font-size: 14px;
    color: var(--text-secondary);
}

.subscribe-btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 10px 16px;
    border-radius: 2px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.subscribe-btn:hover {
    background-color: #cc0000;
}

.related-videos {
    width: 100%;
    padding: 16px;
}

.related-title {
    font-size: 20px;
    margin-bottom: 16px;
    font-weight: 500;
    text-align: center;
}

.mobile-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    background-color: var(--background-color);
    display: flex;
    justify-content: space-around;
    padding: 12px 0;
    border-top: 1px solid var(--surface-color);
    z-index: 100;
}

.nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    color: var(--text-secondary);
    font-size: 12px;
    cursor: pointer;
    transition: var(--transition);
}

.nav-item.active {
    color: var(--primary-color);
}

.nav-item i {
    font-size: 20px;
    margin-bottom: 4px;
}

/* Download Section */
.download-section {
    padding: 40px 20px;
    background: linear-gradient(135deg, var(--surface-color) 0%, #1a1a1a 100%);
    border-radius: 20px;
    margin: 20px auto;
    max-width: 500px;
    text-align: center;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    border: 1px solid #333;
}

.download-icon {
    font-size: 64px;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.download-title {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 10px;
    background: linear-gradient(45deg, #ff0000, #ff6b6b);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.download-subtitle {
    font-size: 16px;
    color: var(--text-secondary);
    margin-bottom: 30px;
}

.download-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin-bottom: 30px;
}

.download-input {
    background-color: var(--background-color);
    border: 2px solid #333;
    padding: 16px;
    border-radius: 12px;
    color: var(--text-primary);
    font-size: 18px;
    text-align: center;
    transition: var(--transition);
}

.download-input:focus {
    border-color: var(--primary-color);
    outline: none;
}

.download-submit {
    background: linear-gradient(45deg, #ff0000, #cc0000);
    color: white;
    border: none;
    padding: 18px;
    border-radius: 12px;
    font-weight: 600;
    font-size: 18px;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 4px 15px rgba(255, 0, 0, 0.3);
}

.download-submit:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(255, 0, 0, 0.4);
}

.download-submit.done {
    background: linear-gradient(45deg, #00c853, #00e676);
    box-shadow: 0 4px 15px rgba(0, 200, 83, 0.3);
}

.download-link-container {
    margin-top: 30px;
    padding: 20px;
    background: var(--background-color);
    border-radius: 12px;
    border: 2px dashed #333;
    animation: fadeIn 0.5s ease;
}

.download-link-btn {
    background: linear-gradient(45deg, #00c853, #00e676);
    color: white;
    border: none;
    padding: 18px 30px;
    border-radius: 12px;
    font-weight: 600;
    font-size: 18px;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 4px 15px rgba(0, 200, 83, 0.3);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    width: 100%;
}

.download-link-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 200, 83, 0.4);
}

/* Account Section - Groups */
.account-section {
    padding: 40px 20px;
    background: linear-gradient(135deg, var(--surface-color) 0%, #1a1a1a 100%);
    border-radius: 20px;
    margin: 20px auto;
    max-width: 900px;
    text-align: center;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    border: 1px solid #333;
}

.account-icon {
    font-size: 64px;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.account-title {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 10px;
    background: linear-gradient(45deg, #ff0000, #ff6b6b);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.account-subtitle {
    font-size: 16px;
    color: var(--text-secondary);
    margin-bottom: 30px;
}

.groups-horizontal {
    display: flex;
    flex-direction: column;
    gap: 40px;
}

.group-section {
    text-align: left;
}

.group-section-title {
    font-size: 22px;
    margin-bottom: 20px;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 10px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--primary-color);
}

.group-section-title i {
    font-size: 24px;
}

.groups-row {
    display: flex;
    gap: 20px;
    overflow-x: auto;
    padding: 10px 0;
}

.group-item {
    display: flex;
    align-items: center;
    background: var(--background-color);
    padding: 20px;
    border-radius: 12px;
    border: 1px solid #333;
    transition: var(--transition);
    min-width: 300px;
    gap: 15px;
}

.group-item:hover {
    transform: translateY(-2px);
    border-color: var(--primary-color);
}

.group-icon {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: linear-gradient(45deg, var(--primary-color), #cc0000);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    color: white;
    flex-shrink: 0;
}

.group-details {
    flex: 1;
}

.group-details h4 {
    font-size: 16px;
    margin-bottom: 5px;
    color: var(--text-primary);
}

.group-members {
    font-size: 14px;
    color: var(--primary-color);
    font-weight: 500;
}

.group-join-btn {
    background: linear-gradient(45deg, var(--primary-color), #cc0000);
    color: white;
    text-decoration: none;
    padding: 8px 16px;
    border-radius: 6px;
    font-weight: 500;
    transition: var(--transition);
    display: inline-block;
    border: none;
    cursor: pointer;
    font-size: 14px;
    white-space: nowrap;
}

.group-join-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(255, 0, 0, 0.3);
}

/* Load More Button */
.load-more-container {
    text-align: center;
    margin: 30px 0;
}

.load-more-btn {
    background: linear-gradient(45deg, var(--primary-color), #cc0000);
    color: white;
    border: none;
    padding: 15px 30px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 16px;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 4px 15px rgba(255, 0, 0, 0.3);
    display: inline-flex;
    align-items: center;
    gap: 10px;
}

.load-more-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(255, 0, 0, 0.4);
}

.load-more-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

/* Ads Overlay */
.ads-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.ads-container {
    background: linear-gradient(135deg, #1a1a1a, #2d2d2d);
    padding: 30px;
    border-radius: 15px;
    text-align: center;
    max-width: 400px;
    width: 90%;
    border: 2px solid var(--primary-color);
    position: relative;
}

.ads-content h3 {
    font-size: 24px;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.ads-content p {
    font-size: 16px;
    color: var(--text-secondary);
    margin-bottom: 20px;
    line-height: 1.5;
}

.ads-btn {
    background: linear-gradient(45deg, #ff0000, #cc0000);
    color: white;
    border: none;
    padding: 15px 30px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 16px;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 4px 15px rgba(255, 0, 0, 0.3);
    width: 100%;
}

.ads-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(255, 0, 0, 0.4);
}

.ads-close {
    position: absolute;
    top: 15px;
    right: 15px;
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 20px;
    cursor: pointer;
    transition: var(--transition);
}

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

.video-number-input {
    margin: 20px 0;
    padding: 16px;
    background-color: var(--surface-color);
    border-radius: 12px;
}

.input-group {
    display: flex;
    gap: 10px;
}

.video-number {
    flex: 1;
    background-color: var(--background-color);
    border: 1px solid var(--secondary-color);
    padding: 12px;
    border-radius: 4px;
    color: var(--text-primary);
    font-size: 16px;
}

.go-btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 12px 20px;
    border-radius: 4px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.go-btn:hover {
    background-color: #cc0000;
}

.success-message {
    color: #00c853;
    font-weight: 500;
    margin-top: 10px;
    animation: fadeIn 0.5s ease;
}

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

@media (max-width: 768px) {
    .video-grid {
        grid-template-columns: 1fr;
    }
    
    .player-actions {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }
    
    .player-buttons {
        margin-top: 12px;
        width: 100%;
        justify-content: space-between;
    }
    
    .player-btn {
        margin-left: 0;
        flex: 1;
        justify-content: center;
    }
    
    .input-group {
        flex-direction: column;
    }
    
    .download-section, .account-section {
        margin: 20px 10px;
        padding: 30px 15px;
    }
    
    .download-title, .account-title {
        font-size: 24px;
    }
    
    .groups-row {
        flex-direction: column;
    }
    
    .group-item {
        min-width: auto;
    }
}

@media (max-width: 480px) {
    .main-content {
        padding: 12px;
    }
    
    .player-content {
        padding: 12px;
    }
    
    .player-title {
        font-size: 16px;
    }
    
    .download-btn {
        padding: 14px 20px;
        font-size: 18px;
    }
    
    .video-grid {
        grid-template-columns: 1fr;
    }
    
    .mobile-nav span {
        font-size: 10px;
    }
}