:root {
    --bg-dark: #0f172a;
    --bg-panel: #1e293b;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --border: #334155;
    --success: #10b981;
}

body {
    background-color: var(--bg-dark);
    color: var(--text-main);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    margin: 0;
    line-height: 1.6;
}

.container {
    max-width: 1100px;
    margin: 2rem auto;
    padding: 0 1rem;
}

.panel {
    background: var(--bg-panel);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

h2 {
    margin-top: 0;
    color: #fff;
    font-size: 1.25rem;
    margin-bottom: 1rem;
}

.upload-zone {
    border: 2px dashed var(--border);
    border-radius: 8px;
    padding: 3rem 2rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s;
    background: var(--bg-dark);
}

.upload-zone:hover {
    border-color: var(--accent);
}

.upload-zone i {
    font-size: 3rem;
    color: var(--accent);
    display: block;
    margin-bottom: 1rem;
}

.preview-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
    gap: 15px;
    margin-top: 1rem;
}

.preview-item {
    text-align: center;
}

.preview-item canvas {
    display: block;
    margin: 0 auto 8px auto;
    border: 1px solid var(--border);
    border-radius: 4px;
    background: white;
    max-width: 100%;
    height: auto;
}

.preview-item label {
    font-size: 0.75rem;
    color: var(--text-muted);
    display: block;
}

.btn {
    background: var(--accent);
    border: none;
    color: #fff;
    padding: 10px 16px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
    width: 100%;
    margin-top: 1rem;
}

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

.btn i {
    margin-right: 8px;
}