* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-size:100%
}
:root{
  --bgColor: linear-gradient(135deg, #6fc7cb 0%, #93ccd6 100%);
}
html{min-height:100%;}
body {
    font-family: 'Hiragino Kaku Gothic ProN', 'Hiragino Sans', 'Meiryo', sans-serif;
    line-height: 1.6;
    font-size: 87%;
    background:#fff;
}

header {
    background: var(--bgColor);
    color: white;
    padding: 30px;
    text-align: center;
}
header h1 {
    font-size: 2rem;
    font-weight: 700;
}
main {
    padding: 40px 40px 0;
}
.items-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 15px;
    margin-bottom: 35px;
}
.item-card {
    background: white;
    border: 2px solid #e0e0e0;
    border-radius: 12px;
    padding: 15px;
    transition: all 0.3s ease;
}
.item-code {
    display: inline-block;
    background: var(--bgColor);
    color: white;
    padding: 6px 14px;
    border-radius: 20px;
    font-weight: 700;
    margin-bottom: 12px;
}
.item-name {
    color: #333;
    font-weight: 500;
    line-height: 1.5;
}
footer {
    background: #f5f5f5;
    text-align: center;
    padding: 20px;
    color: #666;
    font-size: 0.9rem;
}
@media (max-width: 768px) {
    header {
        padding: 20px;
    }
    header h1 {
        font-size: 1.8rem;
    }
    main {
        padding: 20px 20px 0;
    }
    .items-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    header h1 {
        font-size: 1.5rem;
    }
}