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

:root {
    --primary-color: #1a1a2e;
    --secondary-color: #16213e;
    --accent-color: #e94560;
    --text-color: #eee;
    --text-muted: #888;
    --bg-color: #0f0f1a;
    --card-bg: #1a1a2e;
    --border-color: #333;
    --success-color: #4caf50;
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

/* Header */
header {
    text-align: center;
    margin-bottom: 2rem;
}

h1 {
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    background: linear-gradient(135deg, #fff 0%, #ccc 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    color: var(--text-muted);
    font-size: 1rem;
}

/* Workspace */
.workspace {
    display: grid;
    grid-template-columns: 400px 1fr;
    gap: 2rem;
    margin-bottom: 2rem;
}

/* Upload Section */
.upload-section {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.upload-area {
    border: 2px dashed var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    background-color: var(--card-bg);
    min-height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.upload-area[hidden] {
    display: none;
}

.upload-area:hover,
.upload-area.dragover {
    border-color: var(--accent-color);
    background-color: rgba(233, 69, 96, 0.1);
}

.upload-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.upload-icon {
    width: 48px;
    height: 48px;
    color: var(--text-muted);
}

.upload-text {
    font-size: 1rem;
    color: var(--text-color);
}

.upload-hint {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.original-preview {
    position: relative;
    border-radius: 12px;
    overflow: hidden;
    background-color: var(--card-bg);
}

.original-preview[hidden] {
    display: none;
}

.original-preview img {
    width: 100%;
    height: auto;
    display: block;
    min-height: 100px;
}

.change-image-btn {
    position: absolute;
    bottom: 0.5rem;
    right: 0.5rem;
    padding: 0.5rem 1rem;
    background-color: rgba(0, 0, 0, 0.7);
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.85rem;
    transition: background-color 0.2s;
}

.change-image-btn:hover {
    background-color: rgba(0, 0, 0, 0.9);
}

/* Canvas Section */
.canvas-section {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    min-width: 0; /* Allow flex item to shrink below content size */
    overflow: hidden;
}

.canvas-container {
    position: relative;
    background-color: white;
    border-radius: 12px;
    overflow: auto;
    max-height: 700px;
    min-height: 300px;
}

.canvas-container.has-image {
    min-height: auto;
    display: inline-block;
}

#spiralCanvas {
    display: block;
    max-width: 100%;
    height: auto;
}

.canvas-placeholder {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #666;
    font-size: 1rem;
    background-color: white;
    z-index: 1;
}

.canvas-placeholder[hidden] {
    display: none !important;
}

.canvas-placeholder.hidden {
    display: none !important;
}

/* Sidebar Controls */
.sidebar-controls {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-top: 1rem;
}

.sidebar-controls[hidden] {
    display: none;
}

.sidebar-buttons {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.sidebar-buttons .btn {
    width: 100%;
    justify-content: center;
}

/* Controls */
.controls {
    background-color: var(--card-bg);
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

.controls[hidden] {
    display: none;
}

.controls-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.control-group label {
    font-size: 0.9rem;
    color: var(--text-muted);
    font-weight: 500;
}

.slider-container {
    display: flex;
    align-items: center;
    gap: 1rem;
}

input[type="range"] {
    flex: 1;
    height: 6px;
    border-radius: 3px;
    background: var(--border-color);
    outline: none;
    -webkit-appearance: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--accent-color);
    cursor: pointer;
    transition: transform 0.2s;
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.1);
}

input[type="range"]::-moz-range-thumb {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--accent-color);
    cursor: pointer;
    border: none;
}

.slider-value {
    min-width: 45px;
    text-align: right;
    font-size: 0.9rem;
    color: var(--text-color);
    font-family: monospace;
}

.speed-buttons {
    display: flex;
    gap: 0.5rem;
}

.speed-btn {
    flex: 1;
    padding: 0.5rem 1rem;
    border: 1px solid var(--border-color);
    background-color: transparent;
    color: var(--text-muted);
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.85rem;
    transition: all 0.2s;
}

.speed-btn:hover {
    border-color: var(--accent-color);
    color: var(--text-color);
}

.speed-btn.active {
    background-color: var(--accent-color);
    border-color: var(--accent-color);
    color: white;
}

/* Actions Row */
.actions-row {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.playback-controls {
    display: flex;
    gap: 0.75rem;
}

.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 500;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

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

.btn-primary:hover {
    background-color: #d63050;
}

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

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

.btn-export {
    background-color: var(--success-color);
    color: white;
}

.btn-export:hover {
    background-color: #45a049;
}

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

.play-icon,
.pause-icon {
    font-size: 0.8rem;
}

.pause-icon[hidden],
.play-icon[hidden] {
    display: none;
}

/* Progress */
.progress-container {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-top: 1.5rem;
}

.progress-bar {
    flex: 1;
    height: 8px;
    background-color: var(--border-color);
    border-radius: 4px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent-color), #f39c12);
    border-radius: 4px;
    width: 0%;
    transition: width 0.1s ease-out;
}

.progress-text {
    min-width: 45px;
    text-align: right;
    font-size: 0.9rem;
    color: var(--text-muted);
    font-family: monospace;
}

/* Status */
.status {
    text-align: center;
    padding: 1rem;
    background-color: var(--card-bg);
    border-radius: 8px;
    margin-top: 1rem;
}

.status[hidden] {
    display: none;
}

.status-text {
    color: var(--text-muted);
}

/* Footer */
footer {
    text-align: center;
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
    font-size: 0.9rem;
}

footer em {
    color: var(--text-color);
}

/* Responsive */
@media (max-width: 900px) {
    .workspace {
        grid-template-columns: 1fr;
    }

    .upload-section {
        order: -1;
    }

    .upload-area {
        min-height: 150px;
    }

    .canvas-container {
        max-height: 500px;
    }
}

@media (max-width: 600px) {
    .container {
        padding: 1rem;
    }

    h1 {
        font-size: 1.5rem;
    }

    .subtitle {
        font-size: 0.9rem;
    }

    .controls-row {
        grid-template-columns: 1fr;
    }

    .actions-row {
        flex-direction: column;
        align-items: stretch;
    }

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

    .btn {
        flex: 1;
        justify-content: center;
    }
}

/* Animation for loading states */
@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

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