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

:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary-color: #64748b;
    --success-color: #22c55e;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --bg-color: #0f172a;
    --surface-color: #1e293b;
    --surface-hover: #334155;
    --text-color: #f1f5f9;
    --text-muted: #94a3b8;
    --border-color: #334155;
    --waveform-color: #3b82f6;
    --selection-color: rgba(239, 68, 68, 0.3);
    --playhead-color: #ef4444;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    padding: 30px 0;
    border-bottom: 2px solid var(--border-color);
    margin-bottom: 30px;
}

header h1 {
    font-size: 2rem;
    background: linear-gradient(135deg, var(--primary-color), #8b5cf6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

section {
    background-color: var(--surface-color);
    border-radius: 12px;
    padding: 24px;
    margin-bottom: 24px;
    border: 1px solid var(--border-color);
}

section h2 {
    font-size: 1.5rem;
    margin-bottom: 20px;
    color: var(--text-color);
    display: flex;
    align-items: center;
    gap: 10px;
}

section h3 {
    font-size: 1.1rem;
    margin-bottom: 12px;
    color: var(--text-muted);
}

/* Upload Section */
.upload-section {
    text-align: center;
}

.upload-area {
    border: 2px dashed var(--border-color);
    border-radius: 12px;
    padding: 60px 20px;
    background-color: var(--bg-color);
    cursor: pointer;
    transition: all 0.3s ease;
}

.upload-area:hover,
.upload-area.drag-over {
    border-color: var(--primary-color);
    background-color: var(--surface-hover);
}

.upload-area p {
    margin-bottom: 8px;
    font-size: 1.1rem;
}

.upload-area .file-formats {
    font-size: 0.9rem;
    color: var(--text-muted);
}

.file-list {
    margin-top: 20px;
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
}

.file-item {
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 12px 20px;
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 0.9rem;
}

.file-item.active {
    border-color: var(--primary-color);
    background-color: var(--primary-dark);
}

.file-item .remove-btn {
    background: none;
    border: none;
    color: var(--danger-color);
    cursor: pointer;
    font-size: 1.2rem;
    padding: 0;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
}

.file-item .remove-btn:hover {
    background-color: rgba(239, 68, 68, 0.1);
}

/* Waveform Section */
.waveform-section {
    background-color: var(--surface-color);
}

.waveform-container {
    position: relative;
    width: 100%;
    height: 200px;
    background-color: var(--bg-color);
    border-radius: 8px;
    overflow: hidden;
    margin-bottom: 16px;
}

#waveformCanvas,
#overlayCanvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

#overlayCanvas {
    pointer-events: none;
}

.zoom-controls {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
}

.zoom-controls button {
    padding: 8px 16px;
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-color);
    cursor: pointer;
    transition: all 0.2s;
}

.zoom-controls button:hover {
    background-color: var(--surface-hover);
}

.zoom-controls input[type="range"] {
    flex: 1;
    max-width: 300px;
}

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

/* Playback Controls */
.playback-controls {
    display: flex;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
}

.control-btn {
    padding: 12px 24px;
    background-color: var(--primary-color);
    border: none;
    border-radius: 8px;
    color: white;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 8px;
}

.control-btn:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
}

.control-btn.active {
    background-color: var(--success-color);
}

.volume-control {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-left: auto;
}

.volume-control input[type="range"] {
    width: 150px;
}

/* Edit Section */
.tool-group {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 16px;
    align-items: center;
}

.tool-btn {
    padding: 10px 20px;
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-color);
    cursor: pointer;
    transition: all 0.2s;
    font-size: 0.95rem;
}

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

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

.tool-group label {
    color: var(--text-muted);
    margin-right: 8px;
}

.tool-group input[type="number"] {
    padding: 8px 12px;
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-color);
    width: 80px;
}

/* Generator Section */
.generator-controls {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    align-items: flex-end;
    margin-bottom: 20px;
}

.generator-type {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.generator-type select {
    padding: 10px 16px;
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-color);
    font-size: 0.95rem;
    cursor: pointer;
    min-width: 150px;
}

.generator-params {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
}

.param-group {
    display: flex;
    align-items: center;
    gap: 8px;
}

.param-group input[type="number"] {
    padding: 8px 12px;
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-color);
    width: 80px;
}

.param-group input[type="range"] {
    width: 100px;
}

.generate-btn {
    padding: 12px 24px;
    background: linear-gradient(135deg, #8b5cf6, #ec4899);
    border: none;
    border-radius: 8px;
    color: white;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.2s;
}

.generate-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(139, 92, 246, 0.3);
}

/* ADSR Controls */
.adsr-controls {
    background-color: var(--bg-color);
    border-radius: 8px;
    padding: 16px;
}

.adsr-controls h3 {
    margin-bottom: 16px;
    color: var(--text-color);
}

.adsr-sliders {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
}

.adsr-param {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.adsr-param label {
    font-size: 0.9rem;
    color: var(--text-muted);
}

.adsr-param input[type="range"] {
    width: 100%;
}

/* Effects Section */
.effects-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

.effect-item {
    background-color: var(--bg-color);
    border-radius: 8px;
    padding: 16px;
}

.effect-item h3 {
    color: var(--text-color);
    margin-bottom: 12px;
    font-size: 1rem;
}

.effect-controls {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.effect-controls label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9rem;
}

.effect-controls input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--primary-color);
}

.eq-bands {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.eq-band {
    display: flex;
    align-items: center;
    gap: 12px;
}

.eq-band label {
    width: 60px;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.eq-slider {
    flex: 1;
}

.eq-value {
    width: 40px;
    text-align: right;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.reverb-params,
.delay-params,
.compressor-params {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-top: 8px;
}

.reverb-params label,
.delay-params label,
.compressor-params label {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.effect-controls input[type="range"] {
    width: 100%;
    accent-color: var(--primary-color);
}

/* Export Section */
.export-controls {
    display: flex;
    align-items: center;
    gap: 16px;
}

.export-btn {
    padding: 14px 28px;
    background: linear-gradient(135deg, #22c55e, #16a34a);
    border: none;
    border-radius: 8px;
    color: white;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.2s;
}

.export-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(34, 197, 94, 0.3);
}

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

#exportStatus {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Footer */
footer {
    text-align: center;
    padding: 30px 0;
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Common Styles */
input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    height: 6px;
    background: var(--bg-color);
    border-radius: 3px;
    outline: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    background: var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
}

input[type="range"]::-moz-range-thumb {
    width: 16px;
    height: 16px;
    background: var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
    border: none;
}

button:active {
    transform: translateY(0);
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 10px;
    }

    header h1 {
        font-size: 1.5rem;
    }

    section {
        padding: 16px;
    }

    .playback-controls {
        justify-content: center;
    }

    .volume-control {
        margin-left: 0;
    }

    .tool-group {
        justify-content: center;
    }

    .generator-controls {
        flex-direction: column;
        align-items: stretch;
    }

    .adsr-sliders {
        grid-template-columns: 1fr;
    }

    .effects-list {
        grid-template-columns: 1fr;
    }
}

/* Loading State */
.loading {
    position: relative;
    pointer-events: none;
    opacity: 0.6;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to {
        transform: translate(-50%, -50%) rotate(360deg);
    }
}

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

.file-item,
.effect-item {
    animation: fadeIn 0.3s ease;
}