:root {
    --bg: #f7f8fb;
    --card: #ffffff;
    --line: #e5e7eb;
    --text: #111827;
    --sub: #6b7280;
    --primary: #2563eb;
    --danger: #dc2626;
}
* { box-sizing: border-box; }
body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans JP", sans-serif;
    background: var(--bg);
    color: var(--text);
}
.container { width: min(1080px, 94vw); margin: 0 auto; }
.site-header { background: #fff; border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 10; }
.nav-wrap { display: flex; gap: 12px; align-items: center; justify-content: space-between; padding: 12px 0; }
.brand { font-weight: 700; text-decoration: none; color: var(--text); }
.nav-links { display: flex; gap: 8px; flex-wrap: wrap; }
.nav-links a { text-decoration: none; color: var(--sub); padding: 8px 10px; border-radius: 8px; }
.nav-links a:hover { background: #f3f4f6; color: var(--text); }
.main-content { padding: 20px 0 40px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 16px; margin-bottom: 16px; }
.cards { display: grid; grid-template-columns: repeat(auto-fit,minmax(180px,1fr)); gap: 12px; }
.metric-label { color: var(--sub); font-size: 0.9rem; }
.metric-value { font-weight: 700; font-size: 1.3rem; margin-top: 6px; }
form { display: grid; gap: 12px; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
label { display: grid; gap: 6px; font-size: 0.95rem; }
input, select, textarea, button { font: inherit; }
input, select, textarea {
    width: 100%; padding: 10px 12px; border: 1px solid var(--line); border-radius: 10px; background: #fff;
}
textarea { min-height: 120px; }
.actions { display: flex; gap: 8px; flex-wrap: wrap; }
.btn, button {
    border: 0; border-radius: 10px; padding: 10px 14px; cursor: pointer; text-decoration: none;
    background: var(--primary); color: #fff; display: inline-flex; align-items: center;
}
.btn.secondary { background: #374151; }
.btn.danger, .danger { background: var(--danger); }
table { width: 100%; border-collapse: collapse; background: #fff; }
th, td { border-bottom: 1px solid var(--line); padding: 10px; text-align: left; vertical-align: top; }
th { color: var(--sub); font-weight: 600; }
.alert { background: #fef2f2; border: 1px solid #fecaca; color: #991b1b; border-radius: 10px; padding: 12px; margin-bottom: 12px; }
.inline { display: inline; }
.small { color: var(--sub); font-size: 0.85rem; }
@media (max-width: 768px) {
    .grid-2 { grid-template-columns: 1fr; }
    .nav-wrap { align-items: flex-start; flex-direction: column; }
    th:nth-child(5), td:nth-child(5) { display: none; }
}