:root {
    --bg: #f4f6f9;
    --surface: #ffffff;
    --text: #1a2332;
    --muted: #64748b;
    --line: #e2e8f0;
    --brand: #e85d04;
    --brand-dark: #c44900;
    --ok: #059669;
    --warn: #d97706;
    --bad: #dc2626;
    --sidebar: #111827;
    --sidebar-text: #cbd5e1;
    --shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
    --radius: 12px;
    --font: "Segoe UI", "Hiragino Sans", "Noto Sans JP", sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.5;
}

a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }

.app-shell {
    display: grid;
    grid-template-columns: 240px 1fr;
    min-height: 100vh;
}

.sidebar {
    background: linear-gradient(180deg, #0f172a 0%, #111827 100%);
    color: var(--sidebar-text);
    padding: 24px 16px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 0 8px 24px;
    border-bottom: 1px solid rgba(255,255,255,.08);
    margin-bottom: 20px;
}

.brand-mark {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    background: linear-gradient(135deg, var(--brand), #f48c06);
    display: grid;
    place-items: center;
    color: #fff;
    font-weight: 700;
}

.brand h1 {
    margin: 0;
    font-size: 18px;
    color: #fff;
}

.brand small {
    display: block;
    font-size: 11px;
    color: #94a3b8;
}

.nav a {
    display: block;
    padding: 10px 12px;
    border-radius: 8px;
    color: var(--sidebar-text);
    margin-bottom: 4px;
    text-decoration: none;
}

.nav a.active,
.nav a:hover {
    background: rgba(255,255,255,.08);
    color: #fff;
}

.main {
    padding: 28px 32px 48px;
}

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    margin-bottom: 24px;
}

.page-header h2 {
    margin: 0;
    font-size: 28px;
}

.page-header p {
    margin: 4px 0 0;
    color: var(--muted);
}

.card {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 20px;
    margin-bottom: 20px;
}

.grid-4 {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 16px;
}

.grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.stat {
    padding: 18px;
}

.stat-label {
    color: var(--muted);
    font-size: 13px;
}

.stat-value {
    font-size: 30px;
    font-weight: 700;
    margin-top: 6px;
}

.badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 600;
}

.badge-ok { background: #d1fae5; color: var(--ok); }
.badge-warn { background: #fef3c7; color: var(--warn); }
.badge-bad { background: #fee2e2; color: var(--bad); }
.badge-muted { background: #f1f5f9; color: var(--muted); }

table {
    width: 100%;
    border-collapse: collapse;
}

th, td {
    padding: 12px 10px;
    border-bottom: 1px solid var(--line);
    text-align: left;
    vertical-align: middle;
    font-size: 14px;
}

th {
    color: var(--muted);
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: .04em;
}

tr:last-child td { border-bottom: 0; }

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    border: 0;
    border-radius: 8px;
    padding: 10px 16px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
}

.btn-primary {
    background: var(--brand);
    color: #fff;
}
.btn-primary:hover { background: var(--brand-dark); text-decoration: none; }

.btn-secondary {
    background: #eef2f7;
    color: var(--text);
}

.btn-danger {
    background: #fee2e2;
    color: var(--bad);
}

.btn-sm { padding: 6px 10px; font-size: 12px; }

.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.form-group { margin-bottom: 14px; }
.form-group.full { grid-column: 1 / -1; }

label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 6px;
}

input[type=text],
input[type=password],
input[type=number],
textarea,
select {
    width: 100%;
    border: 1px solid var(--line);
    border-radius: 8px;
    padding: 10px 12px;
    font: inherit;
    background: #fff;
}

textarea { min-height: 100px; resize: vertical; }

.alert {
    padding: 12px 14px;
    border-radius: 8px;
    margin-bottom: 16px;
}

.alert-success { background: #ecfdf5; color: var(--ok); border: 1px solid #a7f3d0; }
.alert-error { background: #fef2f2; color: var(--bad); border: 1px solid #fecaca; }

.login-page {
    min-height: 100vh;
    display: grid;
    place-items: center;
    background:
        radial-gradient(circle at top right, rgba(232,93,4,.15), transparent 40%),
        linear-gradient(180deg, #fff 0%, var(--bg) 100%);
}

.login-card {
    width: min(420px, 92vw);
}

.actions { display: flex; gap: 8px; flex-wrap: wrap; }

.empty {
    text-align: center;
    color: var(--muted);
    padding: 32px 12px;
}

.mono {
    font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
    font-size: 12px;
}

@media (max-width: 960px) {
    .app-shell { grid-template-columns: 1fr; }
    .sidebar { padding-bottom: 8px; }
    .nav { display: flex; flex-wrap: wrap; gap: 6px; }
    .grid-4, .grid-2, .form-grid { grid-template-columns: 1fr; }
    .main { padding: 20px 16px 40px; }
}