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

body {
    font-family: 'Segoe UI', Arial, sans-serif;
    background: #f0f2f5;
    min-height: 100vh;
}

#app {
    max-width: 1100px;
    margin: 40px auto;
    padding: 40px;
    background: #fff;
    border-radius: 16px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.08);
}

h1 {
    text-align: center;
    margin-bottom: 30px;
    font-size: 28px;
    color: #333;
}

.designer-container {
    display: flex;
    gap: 30px;
    justify-content: center;
    align-items: flex-start;
}

canvas {
    border: 2px solid #e0e0e0;
    border-radius: 8px;
}

.controls {
    display: flex;
    flex-direction: column;
    gap: 15px;
    min-width: 180px;
}

.controls button {
    padding: 14px 24px;
    font-size: 16px;
    background: #4f46e5;
    color: #fff;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.2s;
}

.controls button:hover {
    background: #4338ca;
}

.controls input[type="file"] {
    font-size: 14px;
}