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

body {
    font-family: 'Noto Sans JP', sans-serif;
    background: #f8f9fa;
    color: #333;
    line-height: 1.6;
}

.app-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    margin-bottom: 30px;
}

header h1 {
    font-size: 2.5rem;
    font-weight: 900;
    margin-bottom: 10px;
    color: #2c3e50;
}

header p {
    font-size: 1.1rem;
    color: #7f8c8d;
}

.main-content {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: 30px;
    align-items: start;
}

.controls-panel {
    background: white;
    padding: 25px;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
    border: 1px solid #e9ecef;
}

.control-group {
    margin-bottom: 20px;
}

label {
    display: block;
    margin-bottom: 8px;
    font-weight: 700;
    color: #2c3e50;
    font-size: 0.9rem;
}

input[type="text"],
select {
    width: 100%;
    padding: 12px;
    border: 2px solid #e9ecef;
    border-radius: 8px;
    font-size: 16px;
    transition: border-color 0.3s ease;
    font-family: 'Noto Sans JP', sans-serif;
}

input[type="text"]:focus,
select:focus {
    outline: none;
    border-color: #3498db;
}

input[type="range"] {
    width: 100%;
    margin: 10px 0;
}

#download-btn {
    width: 100%;
    padding: 15px;
    background: linear-gradient(135deg, #e74c3c, #c0392b);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 700;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    font-family: 'Noto Sans JP', sans-serif;
}

#download-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(231, 76, 60, 0.4);
}

.canvas-container {
    display: flex;
    justify-content: center;
    align-items: center;
    background: white;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
    padding: 30px;
    border: 1px solid #e9ecef;
}

#sign-canvas {
    border: 2px solid #ecf0f1;
    border-radius: 8px;
    cursor: crosshair;
}

@media (max-width: 768px) {
    .main-content {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .controls-panel {
        order: 2;
    }
    
    .canvas-container {
        order: 1;
        padding: 20px;
    }
    
    #sign-canvas {
        width: 100%;
        height: auto;
    }
}