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

:root {
    --bg-primary: #0a0a0f;
    --bg-secondary: #13131a;
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --text-primary: #ffffff;
    --text-secondary: #a0a0b0;
    --accent-primary: #8b5cf6;
    --accent-secondary: #6366f1;
    --accent-gradient: linear-gradient(135deg, #8b5cf6 0%, #6366f1 100%);
    --success: #10b981;
    --shadow: rgba(0, 0, 0, 0.3);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    background-image:
        radial-gradient(at 20% 30%, rgba(139, 92, 246, 0.15) 0px, transparent 50%),
        radial-gradient(at 80% 70%, rgba(99, 102, 241, 0.15) 0px, transparent 50%);
    padding: 2rem;
}

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

header {
    text-align: center;
    margin-bottom: 3rem;
    animation: fadeInDown 0.6s ease-out;
}

h1 {
    font-size: 3rem;
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
    font-weight: 300;
}

.glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: 0 8px 32px var(--shadow);
    transition: all 0.3s ease;
    animation: fadeInUp 0.6s ease-out;
}

.glass-card:hover {
    border-color: rgba(255, 255, 255, 0.15);
    box-shadow: 0 12px 48px var(--shadow);
}

/* Songs Section */
.songs-section {
    animation-delay: 0.1s;
}

.songs-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.songs-header h2 {
    font-size: 1.25rem;
    font-weight: 600;
}

.add-song-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.625rem 1.25rem;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    color: var(--text-primary);
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.add-song-btn svg {
    width: 18px;
    height: 18px;
}

.add-song-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--accent-primary);
}

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

.song-card {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid transparent;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.song-card:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--glass-border);
}

.song-card.active {
    background: rgba(139, 92, 246, 0.1);
    border-color: var(--accent-primary);
}

.song-card-info {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex: 1;
}

.song-card-icon {
    width: 40px;
    height: 40px;
    border-radius: 8px;
    background: var(--accent-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.song-card-icon svg {
    width: 20px;
    height: 20px;
    color: white;
}

.song-card-details {
    flex: 1;
    min-width: 0;
}

.song-card-name {
    font-weight: 600;
    margin-bottom: 0.25rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.song-card-meta {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.song-card-actions {
    display: flex;
    gap: 0.5rem;
}

.song-card-btn {
    width: 32px;
    height: 32px;
    border-radius: 6px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--glass-border);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s ease;
}

.song-card-btn svg {
    width: 16px;
    height: 16px;
    color: var(--text-primary);
}

.song-card-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--accent-primary);
}

.song-card-btn.delete:hover {
    background: rgba(239, 68, 68, 0.1);
    border-color: #ef4444;
}

.song-card-btn.delete:hover svg {
    color: #ef4444;
}


/* Upload Section */
.upload-area {
    border: 2px dashed var(--glass-border);
    border-radius: 16px;
    padding: 3rem 2rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
}

.upload-area:hover {
    border-color: var(--accent-primary);
    background: rgba(139, 92, 246, 0.05);
}

.upload-area.drag-over {
    border-color: var(--accent-primary);
    background: rgba(139, 92, 246, 0.1);
    transform: scale(1.02);
}

.upload-icon {
    width: 64px;
    height: 64px;
    color: var(--accent-primary);
    margin-bottom: 1rem;
}

.upload-area h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.upload-area p {
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

.file-types {
    font-size: 0.875rem;
    color: var(--text-secondary);
    opacity: 0.7;
}

.file-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    background: rgba(255, 255, 255, 0.03);
    border-radius: 12px;
}

.file-details {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.music-icon {
    width: 40px;
    height: 40px;
    color: var(--accent-primary);
}

.file-name {
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.file-size {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.change-file-btn {
    padding: 0.5rem 1.5rem;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    color: var(--text-primary);
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.change-file-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--accent-primary);
}

/* Playback Controls */
.playback-controls {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 2rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--glass-border);
}

.play-btn {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: var(--accent-gradient);
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    box-shadow: 0 4px 16px rgba(139, 92, 246, 0.4);
}

.play-btn:hover {
    transform: scale(1.1);
    box-shadow: 0 6px 24px rgba(139, 92, 246, 0.6);
}

.play-btn:active {
    transform: scale(0.95);
}

.play-icon,
.pause-icon {
    width: 24px;
    height: 24px;
    color: white;
}

.time-display {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-variant-numeric: tabular-nums;
    font-weight: 500;
    min-width: 100px;
}

.time-separator {
    color: var(--text-secondary);
}

.progress-bar {
    flex: 1;
    height: 8px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

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

/* Effects Grid */
.effects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.effect-control {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.effect-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.effect-header label {
    font-weight: 600;
    font-size: 0.95rem;
}

.effect-value {
    font-weight: 600;
    color: var(--accent-primary);
    font-variant-numeric: tabular-nums;
}

/* Toggle Switch */
.toggle-switch {
    position: relative;
    width: 48px;
    height: 24px;
    cursor: pointer;
}

.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 24px;
    transition: all 0.3s ease;
}

.toggle-slider:before {
    content: "";
    position: absolute;
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 3px;
    background: white;
    border-radius: 50%;
    transition: all 0.3s ease;
}

.toggle-switch input:checked+.toggle-slider {
    background: var(--accent-gradient);
}

.toggle-switch input:checked+.toggle-slider:before {
    transform: translateX(24px);
}

/* Slider */
.slider {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 8px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
    outline: none;
    transition: all 0.2s ease;
}

.slider:hover {
    background: rgba(255, 255, 255, 0.15);
}

.slider:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    background: var(--accent-gradient);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(139, 92, 246, 0.4);
    transition: all 0.2s ease;
}

.slider::-webkit-slider-thumb:hover {
    transform: scale(1.2);
    box-shadow: 0 4px 12px rgba(139, 92, 246, 0.6);
}

.slider::-moz-range-thumb {
    width: 20px;
    height: 20px;
    background: var(--accent-gradient);
    border-radius: 50%;
    cursor: pointer;
    border: none;
    box-shadow: 0 2px 8px rgba(139, 92, 246, 0.4);
    transition: all 0.2s ease;
}

.slider::-moz-range-thumb:hover {
    transform: scale(1.2);
    box-shadow: 0 4px 12px rgba(139, 92, 246, 0.6);
}

.slider-labels {
    display: flex;
    justify-content: space-between;
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-top: 0.5rem;
}

/* Action Buttons */
.action-buttons {
    display: flex;
    gap: 1rem;
    justify-content: flex-end;
}

.primary-btn,
.secondary-btn {
    padding: 0.875rem 2rem;
    border-radius: 12px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    border: none;
}

.primary-btn {
    background: var(--accent-gradient);
    color: white;
    box-shadow: 0 4px 16px rgba(139, 92, 246, 0.4);
}

.primary-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(139, 92, 246, 0.6);
}

.primary-btn:active {
    transform: translateY(0);
}

.secondary-btn {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
    border: 1px solid var(--glass-border);
}

.secondary-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--accent-primary);
}

/* Animations */
@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive */
@media (max-width: 768px) {
    body {
        padding: 1rem;
    }

    h1 {
        font-size: 2rem;
    }

    .glass-card {
        padding: 1.5rem;
    }

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

    .action-buttons {
        flex-direction: column;
    }

    .primary-btn,
    .secondary-btn {
        width: 100%;
    }
}