:root {
    --primary: #2563eb;
    --bg: #f8fafc;
    --text: #1e293b;
}

body { 
    font-family: 'Hiragino Kaku Gothic ProN', 'Meiryo', 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    margin: 0;
}

header, main {
    max-width: 1000px;
    margin: 0 auto;
    padding: 20px;
}

table { width:
    100%; border-collapse: collapse;
    background: #fff;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1);
}

th, td {
    border: 1px solid #e2e8f0;
    padding: 12px;
    text-align: center;
}

th {
    background: #f1f5f9;
    font-weight: 600;
}

select {
    padding: 8px; 
    border-radius: 4px;
    border: 1px solid #cbd5e1;
    background: #fff;
    cursor: pointer;
}

.btn {
    display: inline-block;
    padding: 10px 20px;
    background: var(--primary);
    color: #fff;
    text-decoration: none;
    border-radius: 6px;
    border: none;
    cursor: pointer;
}

.btn-save {
    background: #059669;
}

textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid #cbd5e1;
    border-radius: 8px;
    box-sizing: border-box;
}