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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    background: white;
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

h1 {
    text-align: center;
    color: #333;
    margin-bottom: 40px;
    font-size: 2.5rem;
}

h2 {
    color: #555;
    margin-bottom: 20px;
    font-size: 1.5rem;
}

.main-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
}

.controls {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

label {
    font-weight: 600;
    color: #555;
    font-size: 0.9rem;
}

input[type="text"],
input[type="number"],
select {
    padding: 12px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

input[type="text"]:focus,
input[type="number"]:focus,
select:focus {
    outline: none;
    border-color: #667eea;
}

input[type="color"] {
    width: 100%;
    height: 50px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    cursor: pointer;
}

input[type="file"] {
    padding: 10px;
    border: 2px dashed #e0e0e0;
    border-radius: 8px;
    cursor: pointer;
}

.btn-primary,
.btn-secondary {
    padding: 15px 30px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
    background: #f0f0f0;
    color: #333;
}

.btn-secondary:hover {
    background: #e0e0e0;
}

.preview {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: #f9f9f9;
    border-radius: 12px;
    padding: 30px;
    min-height: 400px;
}

#canvas {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-top: 20px;
}

@media (max-width: 768px) {
    .main-content {
        grid-template-columns: 1fr;
    }

    .container {
        padding: 20px;
    }

    h1 {
        font-size: 1.8rem;
    }
}