:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-main: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.5;
}

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

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

header h1 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

header p {
    color: var(--text-secondary);
}

.workspace {
    display: flex;
    gap: 2rem;
    align-items: flex-start;
}

/* Controls */
.controls {
    flex: 0 0 350px;
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

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

.grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-main);
}

input[type="number"],
textarea {
    width: 100%;
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 0.875rem;
}

input[type="number"]:focus,
textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(37,99,235,0.1);
}

textarea {
    resize: vertical;
}

/* File Upload */
.btn-upload {
    display: inline-block;
    padding: 0.5rem 1rem;
    background-color: #f1f5f9;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    cursor: pointer;
    text-align: center;
    transition: all 0.2s;
}

.btn-upload:hover {
    background-color: #e2e8f0;
}

input[type="file"] {
    display: none;
}

.file-name {
    font-size: 0.75rem;
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Color Picker */
.color-picker-wrapper {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

input[type="color"] {
    -webkit-appearance: none;
    width: 30px;
    height: 30px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    background: none;
    padding: 0;
}

input[type="color"]::-webkit-color-swatch-wrapper {
    padding: 0;
}

input[type="color"]::-webkit-color-swatch {
    border: 1px solid var(--border-color);
    border-radius: 4px;
}

.color-value {
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-family: monospace;
}

/* Actions */
.btn-primary {
    width: 100%;
    padding: 0.75rem;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 4px;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s;
}

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

.btn-primary:disabled {
    background-color: #94a3b8;
    cursor: not-allowed;
}

/* Preview */
.preview {
    flex: 1;
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    min-height: 600px;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    overflow: auto;
}

.canvas-container {
    position: relative;
    max-width: 100%;
}

canvas {
    max-width: 100%;
    height: auto;
    display: block;
    box-shadow: 0 4px 6px -1px rgba(0,0,0,0.1);
}

.placeholder {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    color: var(--text-secondary);
}

.placeholder .icon {
    font-size: 3rem;
    margin-bottom: 0.5rem;
    opacity: 0.5;
}

@media (max-width: 768px) {
    .workspace {
        flex-direction: column;
    }
    .controls {
        flex: none;
        width: 100%;
    }
    .preview {
        width: 100%;
        min-height: 400px;
    }
}