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

:root {
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --bg-tertiary: #3d3d3d;
    --text-primary: #ffffff;
    --text-secondary: #b3b3b3;
    --accent-primary: #3498db;
    --accent-hover: #2980b9;
    --danger: #e74c3c;
    --danger-hover: #c0392b;
    --border-color: #404040;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    max-width: 100%;
    margin: 0 auto;
    padding: 1rem;
    flex: 1;
    display: flex;
    flex-direction: column;
}

h1 {
    text-align: center;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.main-content {
    display: flex;
    gap: 1rem;
    flex: 1;
    min-height: 0;
}

.controls-panel {
    width: 300px;
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.upload-container {
    margin-bottom: 0;
}

.upload-area {
    border: 2px dashed var(--accent-primary);
    border-radius: 8px;
    padding: 1rem;
    text-align: center;
    background-color: var(--bg-secondary);
    cursor: pointer;
    transition: all 0.3s ease;
}

.upload-area:hover {
    border-color: var(--accent-hover);
    background-color: var(--bg-tertiary);
}

.upload-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.upload-content svg {
    color: var(--accent-primary);
    width: 32px;
    height: 32px;
}

.upload-content p {
    font-size: 0.9rem;
    margin: 0;
    color: var(--text-secondary);
}

.controls {
    background-color: var(--bg-secondary);
    padding: 1rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.control-group {
    margin-bottom: 0;
}

label {
    display: block;
    margin-bottom: 0.25rem;
    font-weight: 500;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

select, input[type="range"] {
    width: 100%;
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    margin-bottom: 0;
    font-size: 0.9rem;
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}

select:focus, input[type="range"]:focus {
    outline: none;
    border-color: var(--accent-primary);
}

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

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

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

button {
    background-color: var(--accent-primary);
    color: var(--text-primary);
    border: none;
    padding: 0.6rem 1rem;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: background-color 0.3s ease;
}

button:disabled {
    background-color: var(--bg-tertiary);
    color: var(--text-secondary);
    cursor: not-allowed;
}

button:hover:not(:disabled) {
    background-color: var(--accent-hover);
}

#resetBtn {
    background-color: var(--danger);
}

#resetBtn:hover:not(:disabled) {
    background-color: var(--danger-hover);
}

.canvas-container {
    flex: 1;
    background-color: var(--bg-secondary);
    padding: 1rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 0;
    overflow: hidden;
}

canvas {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

#downloadBtn {
    display: block;
    margin: 0 auto;
}