:root {
    --primary-color: #1db954;
    --primary-hover: #1ed760;
    --background: #000000;
    --surface: #121212;
    --surface-light: #181818;
    --text-primary: #ffffff;
    --text-secondary: #b3b3b3;
    --border: #282828;
    --slider-track: #535353;
    --slider-thumb: #ffffff;
    --danger: #e22134;
    --warning: #ffa116;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--background);
    color: var(--text-primary);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -webkit-tap-highlight-color: transparent;
}

#app {
    max-width: 100vw;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    background-color: var(--surface);
    border-bottom: 1px solid var(--border);
}

header h1 {
    font-size: 1.25rem;
    font-weight: 600;
}

.icon-btn {
    background: none;
    border: none;
    color: var(--text-primary);
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    border-radius: 50%;
    transition: background-color 0.2s;
}

.icon-btn:hover {
    background-color: var(--surface-light);
}

.icon-btn svg {
    width: 24px;
    height: 24px;
}

/* Player Section */
#player {
    padding: 1.5rem;
    background-color: var(--surface);
    margin-bottom: 1px;
}

.album-art {
    width: 200px;
    height: 200px;
    margin: 0 auto 1.5rem;
    background-color: var(--surface-light);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.album-art img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.album-art svg {
    width: 80px;
    height: 80px;
    color: var(--text-secondary);
}

.track-info {
    text-align: center;
    margin-bottom: 1.5rem;
}

.track-info h2 {
    font-size: 1.25rem;
    margin-bottom: 0.25rem;
}

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

.player-controls {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.play-btn {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background-color: var(--primary-color);
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}

.play-btn:hover:not(:disabled) {
    background-color: var(--primary-hover);
    transform: scale(1.05);
}

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

.play-btn svg {
    width: 24px;
    height: 24px;
    color: var(--background);
}

.secondary-btn, .primary-btn, .small-btn {
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

.secondary-btn {
    background-color: transparent;
    color: var(--text-primary);
    border: 1px solid var(--text-secondary);
}

.secondary-btn:hover {
    border-color: var(--text-primary);
    background-color: var(--surface-light);
}

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

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

.small-btn {
    padding: 0.375rem 0.75rem;
    font-size: 0.75rem;
    background-color: var(--surface-light);
    color: var(--text-primary);
}

.small-btn:hover {
    background-color: var(--border);
}

.progress-container {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.progress-container span {
    font-size: 0.75rem;
    color: var(--text-secondary);
    min-width: 35px;
}

#progressBar {
    flex: 1;
    height: 4px;
    background-color: var(--slider-track);
    border-radius: 2px;
    outline: none;
    -webkit-appearance: none;
}

#progressBar::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 12px;
    height: 12px;
    background-color: var(--slider-thumb);
    border-radius: 50%;
    cursor: pointer;
}

/* Spectrum Analyzer */
#analyzer {
    background-color: var(--surface);
    padding: 1rem;
    margin-bottom: 1px;
}

#spectrumCanvas {
    width: 100%;
    height: 150px;
    background-color: var(--background);
    border-radius: 4px;
    margin-bottom: 0.5rem;
}

.analyzer-controls {
    display: flex;
    gap: 0.5rem;
    justify-content: center;
}

/* EQ Section */
#equalizer {
    background-color: var(--surface);
    padding: 1rem;
    margin-bottom: 1px;
}

.eq-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.eq-header h3 {
    font-size: 1rem;
}

.eq-controls {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

#presetSelect {
    background-color: var(--surface-light);
    color: var(--text-primary);
    border: 1px solid var(--border);
    padding: 0.375rem 0.75rem;
    border-radius: 4px;
    font-size: 0.75rem;
}

.eq-bands {
    display: flex;
    gap: 4px;
    overflow-x: auto;
    padding-bottom: 0.5rem;
    -webkit-overflow-scrolling: touch;
}

.eq-band {
    display: flex;
    flex-direction: column;
    align-items: center;
    min-width: 40px;
}

.eq-slider {
    width: 30px;
    height: 120px;
    -webkit-appearance: slider-vertical;
    background: transparent;
    outline: none;
}

.eq-slider::-webkit-slider-track {
    width: 4px;
    background: var(--slider-track);
    border-radius: 2px;
}

.eq-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    background: var(--slider-thumb);
    border-radius: 50%;
    cursor: pointer;
}

.eq-label {
    font-size: 0.625rem;
    color: var(--text-secondary);
    margin-top: 0.25rem;
}

.eq-value {
    font-size: 0.625rem;
    color: var(--primary-color);
    margin-top: 0.25rem;
    min-height: 14px;
}

/* Calibration Section */
#calibration {
    background-color: var(--surface);
    padding: 1.5rem;
}

#calibration h3 {
    font-size: 1rem;
    margin-bottom: 1rem;
}

.calibration-controls {
    display: flex;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.status-message {
    padding: 0.75rem;
    border-radius: 8px;
    font-size: 0.875rem;
    text-align: center;
    display: none;
}

.status-message.info {
    background-color: rgba(29, 185, 84, 0.1);
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
    display: block;
}

.status-message.error {
    background-color: rgba(226, 33, 52, 0.1);
    color: var(--danger);
    border: 1px solid var(--danger);
    display: block;
}

.status-message.warning {
    background-color: rgba(255, 161, 22, 0.1);
    color: var(--warning);
    border: 1px solid var(--warning);
    display: block;
}

.advanced-options {
    margin-top: 1rem;
    padding: 1rem;
    background-color: var(--surface-light);
    border-radius: 8px;
}

.advanced-options label {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.75rem;
}

.advanced-options label:last-child {
    margin-bottom: 0;
}

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

.advanced-options select,
.advanced-options input[type="range"] {
    background-color: var(--surface);
    color: var(--text-primary);
    border: 1px solid var(--border);
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-size: 0.875rem;
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal-content {
    background-color: var(--surface);
    padding: 2rem;
    border-radius: 12px;
    max-width: 90%;
    width: 400px;
}

.modal-content h3 {
    margin-bottom: 1.5rem;
}

.settings-group label {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    font-size: 0.875rem;
}

.settings-group input[type="checkbox"] {
    width: 40px;
    height: 24px;
    -webkit-appearance: none;
    background-color: var(--slider-track);
    border-radius: 12px;
    position: relative;
    cursor: pointer;
    transition: background-color 0.2s;
}

.settings-group input[type="checkbox"]:checked {
    background-color: var(--primary-color);
}

.settings-group input[type="checkbox"]:before {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background-color: white;
    top: 2px;
    left: 2px;
    transition: transform 0.2s;
}

.settings-group input[type="checkbox"]:checked:before {
    transform: translateX(16px);
}

/* Responsive Design */
@media (max-width: 600px) {
    .album-art {
        width: 150px;
        height: 150px;
    }
    
    .eq-bands {
        gap: 2px;
    }
    
    .eq-band {
        min-width: 35px;
    }
}

/* PWA Install Prompt */
.install-prompt {
    position: fixed;
    bottom: 20px;
    left: 20px;
    right: 20px;
    background-color: var(--surface-light);
    padding: 1rem;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: space-between;
    z-index: 999;
}

.install-prompt p {
    font-size: 0.875rem;
    margin-right: 1rem;
}

.install-prompt button {
    margin-left: 0.5rem;
}