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

:root {
    /* Dark theme only */
    --bg-primary: linear-gradient(135deg, #1a0f2e 0%, #16213e 50%, #0f3460 100%);
    --bg-secondary: rgba(255, 255, 255, 0.05);
    --bg-tertiary: rgba(255, 255, 255, 0.1);
    --text-primary: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.8);
    --text-muted: rgba(255, 255, 255, 0.5);
    --accent-pink: #ff1493;
    --accent-cyan: #00ffff;
    --border-color: rgba(255, 255, 255, 0.1);
    --shadow-color: rgba(0, 0, 0, 0.3);
    --focus-ring: rgba(0, 255, 255, 0.9);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', sans-serif;
    background: var(--bg-primary);
    min-height: 100vh;
    color: var(--text-primary);
    overflow-x: hidden;
    transition: all 0.3s ease;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

button:focus-visible,
input:focus-visible,
.progress-bar:focus-visible,
a:focus-visible {
    outline: 3px solid var(--focus-ring);
    outline-offset: 3px;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.header {
    text-align: center;
    margin-bottom: 40px;
    padding: 20px 0;
    position: relative;
}

.title {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 10px;
    text-shadow: 0 0 30px rgba(255, 20, 147, 0.3);
}

.title-gradient {
    background: linear-gradient(45deg, var(--accent-pink), var(--accent-cyan), var(--accent-pink));
    background-size: 300% 300%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: gradientShift 3s ease-in-out infinite;
}

@keyframes gradientShift {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

.subtitle {
    font-size: 1.2rem;
    font-weight: 300;
    color: var(--text-secondary);
}

.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 30px;
    max-width: 100%;
    overflow: hidden;
}

/* Playlist Section */
.playlist-section {
    background: var(--bg-secondary);
    border-radius: 20px;
    padding: 25px;
    backdrop-filter: blur(15px);
    border: 1px solid var(--border-color);
    box-shadow: 0 8px 32px var(--shadow-color);
    width: 100%;
    max-width: 100%;
}

.playlist-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
    flex-wrap: wrap;
    gap: 15px;
}

.playlist-header h2 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--accent-pink);
    text-shadow: 0 0 10px rgba(255, 20, 147, 0.3);
}

.playlist-controls {
    display: flex;
    gap: 15px;
    flex: 1;
    max-width: 400px;
}

.playlist-input {
    flex: 1;
    padding: 12px 15px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    background: var(--bg-tertiary);
    color: var(--text-primary);
    font-size: 0.9rem;
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
    min-width: 0;
}

.playlist-input:focus {
    border-color: var(--accent-pink);
    box-shadow: 0 0 15px rgba(255, 20, 147, 0.3);
}

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

.add-btn {
    padding: 12px 20px;
    background: linear-gradient(45deg, var(--accent-pink), var(--accent-cyan));
    border: none;
    border-radius: 8px;
    color: var(--text-primary);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    white-space: nowrap;
    flex-shrink: 0;
}

.add-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(255, 20, 147, 0.4);
}

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

.playlist-container {
    max-height: 300px;
    overflow-y: auto;
}

.playlist-items {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.playlist-empty {
    text-align: center;
    padding: 40px 20px;
    color: var(--text-muted);
}

.playlist-item {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 15px;
    background: var(--bg-tertiary);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
    min-width: 0;
}

.playlist-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px var(--shadow-color);
}

.playlist-thumbnail {
    width: 60px;
    height: 45px;
    border-radius: 8px;
    object-fit: cover;
    background: var(--bg-secondary);
    flex-shrink: 0;
}

.playlist-info {
    flex: 1;
    min-width: 0;
}

.playlist-title {
    font-weight: 600;
    margin-bottom: 4px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.playlist-url {
    font-size: 0.8rem;
    color: var(--text-muted);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.playlist-actions {
    display: flex;
    gap: 8px;
    flex-shrink: 0;
}

.action-btn {
    padding: 6px 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 0.8rem;
    cursor: pointer;
    transition: all 0.3s ease;
    white-space: nowrap;
}

.action-btn:hover {
    background: var(--bg-tertiary);
    border-color: var(--accent-pink);
}

.action-btn.load-a {
    border-color: var(--accent-pink);
}

.action-btn.load-b {
    border-color: var(--accent-cyan);
}

.action-btn.remove {
    border-color: #ff4757;
    color: #ff4757;
}

/* Crossfade Section */
.crossfade-section {
    width: 100%;
    display: flex;
    justify-content: center;
    order: 2;
}

.crossfade-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
    background: var(--bg-secondary);
    padding: 25px;
    border-radius: 20px;
    backdrop-filter: blur(15px);
    border: 1px solid var(--border-color);
    box-shadow: 0 8px 32px var(--shadow-color);
    width: 100%;
    max-width: 100%;
}

.crossfade-label {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--accent-pink);
    text-shadow: 0 0 10px rgba(255, 20, 147, 0.3);
}

.crossfade-wrapper {
    display: flex;
    align-items: center;
    gap: 15px;
    width: 100%;
}

.crossfade-marker {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--accent-cyan);
    text-shadow: 0 0 10px rgba(0, 255, 255, 0.3);
    flex-shrink: 0;
}

.crossfade-slider {
    flex: 1;
    height: 8px;
    background: var(--bg-tertiary);
    border-radius: 4px;
    cursor: pointer;
    -webkit-appearance: none;
    min-width: 0;
}

.crossfade-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 28px;
    height: 28px;
    background: linear-gradient(45deg, var(--accent-pink), var(--accent-cyan));
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 4px 15px rgba(255, 20, 147, 0.4);
    transition: transform 0.2s ease;
}

.crossfade-slider::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

.crossfade-slider::-moz-range-thumb {
    width: 28px;
    height: 28px;
    background: linear-gradient(45deg, var(--accent-pink), var(--accent-cyan));
    border-radius: 50%;
    cursor: pointer;
    border: none;
    box-shadow: 0 4px 15px rgba(255, 20, 147, 0.4);
}

.crossfade-value {
    font-size: 1rem;
    font-weight: 600;
    color: var(--accent-cyan);
}

/* Players Section */
.players-section {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    align-items: start;
    order: 3;
    width: 100%;
    max-width: 100%;
    overflow: hidden;
}

.player-container {
    background: var(--bg-secondary);
    border-radius: 20px;
    padding: 25px;
    backdrop-filter: blur(15px);
    border: 1px solid var(--border-color);
    box-shadow: 0 8px 32px var(--shadow-color);
    width: 100%;
    max-width: 100%;
    min-width: 0;
    overflow: hidden;
}

.player-header {
    margin-bottom: 15px;
}

.player-header h3 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 5px;
}

.track-info {
    font-size: 0.9rem;
    color: var(--text-muted);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.video-wrapper {
    position: relative;
    width: 100%;
    height: 250px;
    border-radius: 15px;
    overflow: hidden;
    margin-bottom: 20px;
    background: #000;
    max-width: 100%;
}

.youtube-player {
    width: 100%;
    height: 100%;
}

.player-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: opacity 0.3s ease;
}

.player-overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

.player-overlay .play-icon {
    font-size: 3rem;
    margin-bottom: 10px;
}

.player-controls {
    display: flex;
    flex-direction: column;
    gap: 15px;
    width: 100%;
    max-width: 100%;
}

.control-row {
    display: flex;
    align-items: center;
    gap: 15px;
    width: 100%;
    max-width: 100%;
}

.control-btn {
    width: 50px;
    height: 50px;
    border: none;
    border-radius: 50%;
    background: linear-gradient(45deg, var(--accent-pink), var(--accent-cyan));
    color: var(--text-primary);
    font-size: 1.2rem;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 15px rgba(255, 20, 147, 0.3);
    flex-shrink: 0;
}

.control-btn:hover:not(:disabled) {
    transform: scale(1.1);
    box-shadow: 0 6px 20px rgba(255, 20, 147, 0.4);
}

.control-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.volume-control {
    display: flex;
    align-items: center;
    gap: 10px;
    flex: 1;
    min-width: 0;
}

.volume-icon {
    font-size: 1.2rem;
    flex-shrink: 0;
}

.volume-slider {
    flex: 1;
    height: 6px;
    background: var(--bg-tertiary);
    border-radius: 3px;
    cursor: pointer;
    -webkit-appearance: none;
    min-width: 0;
}

.volume-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    background: linear-gradient(45deg, var(--accent-pink), var(--accent-cyan));
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(255, 20, 147, 0.3);
}

.volume-slider::-moz-range-thumb {
    width: 18px;
    height: 18px;
    background: linear-gradient(45deg, var(--accent-pink), var(--accent-cyan));
    border-radius: 50%;
    cursor: pointer;
    border: none;
    box-shadow: 0 2px 8px rgba(255, 20, 147, 0.3);
}

.volume-value {
    font-size: 0.9rem;
    font-weight: 500;
    min-width: 40px;
    text-align: right;
    color: var(--accent-cyan);
    flex-shrink: 0;
}

.progress-container {
    display: flex;
    flex-direction: column;
    gap: 10px;
    width: 100%;
    max-width: 100%;
}

.time-display {
    display: flex;
    justify-content: space-between;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.progress-bar-wrapper {
    position: relative;
    height: 8px;
    background: var(--bg-tertiary);
    border-radius: 4px;
    cursor: pointer;
    width: 100%;
}

.progress-bar {
    width: 100%;
    height: 100%;
    position: relative;
    border-radius: 4px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent-pink), var(--accent-cyan));
    border-radius: 4px;
    width: 0%;
    transition: width 0.1s ease;
}

.progress-handle {
    position: absolute;
    top: 50%;
    transform: translate(-50%, -50%);
    width: 16px;
    height: 16px;
    background: var(--text-primary);
    border-radius: 50%;
    cursor: pointer;
    left: 0%;
    transition: left 0.1s ease;
    box-shadow: 0 2px 8px var(--shadow-color);
}

.skip-controls {
    display: flex;
    justify-content: center;
    gap: 15px;
}

.skip-btn {
    padding: 8px 15px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-primary);
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.3s ease;
    white-space: nowrap;
}

.skip-btn:hover:not(:disabled) {
    background: var(--bg-secondary);
    border-color: var(--accent-pink);
}

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

/* Footer */
.footer {
    margin-top: 40px;
    padding: 30px 0;
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
}

.footer-content {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 30px;
    flex-wrap: wrap;
}

.footer-content p {
    margin: 0;
}

.footer a {
    color: var(--accent-pink);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer a:hover {
    color: var(--accent-cyan);
    text-shadow: 0 0 10px rgba(0, 255, 255, 0.3);
}

/* Responsive Design */
@media (max-width: 1024px) {
    .playlist-controls {
        max-width: none;
    }
    
    .crossfade-wrapper {
        gap: 15px;
    }
    
    .player-container {
        padding: 20px;
    }
    
    .video-wrapper {
        height: 200px;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 15px;
    }
    
    .title {
        font-size: 2.5rem;
    }
    
    .playlist-header {
        flex-direction: column;
        align-items: stretch;
    }
    
    .playlist-controls {
        flex-direction: column;
        max-width: none;
    }
    
    .main-content {
        gap: 20px;
    }
    
    .playlist-section {
        order: 1;
    }
    
    .crossfade-section {
        order: 2;
    }
    
    .players-section {
        order: 3;
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .video-wrapper {
        height: 180px;
    }
    
    .control-row {
        flex-wrap: wrap;
        gap: 10px;
    }
    
    .volume-control {
        min-width: 200px;
    }
    
    .crossfade-wrapper {
        flex-direction: column;
        gap: 10px;
    }
    
    .crossfade-slider {
        width: 100%;
        min-width: 250px;
    }
    
    .footer-content {
        flex-direction: column;
        gap: 10px;
    }
}

@media (max-width: 480px) {
    .title {
        font-size: 2rem;
    }
    
    .subtitle {
        font-size: 1rem;
    }
    
    .player-container {
        padding: 15px;
    }
    
    .video-wrapper {
        height: 160px;
    }
    
    .control-btn {
        width: 40px;
        height: 40px;
        font-size: 1rem;
    }
    
    .crossfade-container {
        padding: 20px 15px;
    }
    
    .skip-controls {
        gap: 10px;
    }
    
    .skip-btn {
        padding: 6px 10px;
        font-size: 0.8rem;
    }
    
    .playlist-item {
        padding: 10px;
        gap: 10px;
    }
    
    .playlist-thumbnail {
        width: 50px;
        height: 38px;
    }
    
    .playlist-actions {
        flex-direction: column;
        gap: 5px;
    }
    
    .action-btn {
        padding: 4px 8px;
        font-size: 0.7rem;
    }
}

/* Loading Animation */
@keyframes pulse {
    0%, 100% { opacity: 0.6; }
    50% { opacity: 1; }
}

.loading {
    animation: pulse 1.5s ease-in-out infinite;
}

/* Smooth Transitions */
* {
    transition: all 0.3s ease;
}

input, button {
    transition: all 0.3s ease;
}

.player-overlay {
    transition: opacity 0.5s ease;
}

/* Custom Scrollbar */
.playlist-container::-webkit-scrollbar {
    width: 8px;
}

.playlist-container::-webkit-scrollbar-track {
    background: var(--bg-tertiary);
    border-radius: 4px;
}

.playlist-container::-webkit-scrollbar-thumb {
    background: linear-gradient(45deg, var(--accent-pink), var(--accent-cyan));
    border-radius: 4px;
}

.playlist-container::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(45deg, var(--accent-cyan), var(--accent-pink));
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        scroll-behavior: auto !important;
        transition-duration: 0.01ms !important;
    }
}