:root {
  color-scheme: light dark;
  --bg: #f4f6f8;
  --card: #ffffff;
  --text: #1f2937;
  --muted: #5f6368;
  --line: #d1d5db;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --warn-bg: #fef2f2;
  --warn-text: #b91c1c;
  --info-bg: #eff6ff;
  --info-text: #1e40af;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111827;
    --card: #1f2937;
    --text: #e5e7eb;
    --muted: #a4abb3;
    --line: #374151;
    --warn-bg: #3b1212;
    --warn-text: #fca5a5;
    --info-bg: #172554;
    --info-text: #bfdbfe;
  }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text);
  font-family: "Segoe UI", "Yu Gothic UI", "Hiragino Sans", "Noto Sans JP", sans-serif; }
.bar { display: flex; justify-content: space-between; align-items: center; gap: 12px;
  padding: 12px 16px; background: var(--card); border-bottom: 1px solid var(--line); flex-wrap: wrap; }
.brand { font-weight: 600; }
.who { display: flex; gap: 12px; align-items: center; color: var(--muted); font-size: 14px; flex-wrap: wrap; }
main { max-width: 1040px; margin: 24px auto; padding: 0 16px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 20px 24px; margin-bottom: 16px; }
.card.narrow { max-width: 440px; margin-left: auto; margin-right: auto; }
h1 { font-size: 20px; margin: 0 0 16px; }
h2 { font-size: 16px; margin: 20px 0 8px; }
label { display: block; font-size: 14px; margin: 10px 0; }
input[type=email], input[type=password], input[type=text], input[type=number], input[type=date], input[type=tel] {
  display: block; width: 100%; margin-top: 4px; padding: 9px 10px; font-size: 15px;
  border: 1px solid var(--line); border-radius: 6px; background: transparent; color: inherit; }
input[type=number] { max-width: 160px; }
button { font: inherit; cursor: pointer; border-radius: 6px; padding: 9px 16px; border: 1px solid var(--line);
  background: transparent; color: inherit; }
button.primary { background: var(--accent); border-color: var(--accent); color: #fff; margin-top: 8px; }
button.primary:hover { background: var(--accent-hover); }
button.secondary { margin-top: 8px; }
button.link { border: none; padding: 0; color: var(--accent); background: none; }
button:disabled { opacity: .5; cursor: default; }
.hint { color: var(--muted); font-size: 13px; }
.message { padding: 10px 14px; border-radius: 6px; margin-bottom: 16px; background: var(--info-bg); color: var(--info-text); }
.message.error, .banner { background: var(--warn-bg); color: var(--warn-text); }
.banner { padding: 12px 16px; border-radius: 8px; margin-bottom: 16px; font-weight: 600; }
.facts { display: grid; grid-template-columns: 9em 1fr; gap: 6px 12px; margin: 0; }
.facts dt { color: var(--muted); }
.facts dd { margin: 0; }
.actions { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 12px; }
fieldset { border: none; padding: 0; margin: 12px 0; }
legend { font-weight: 600; font-size: 14px; margin-bottom: 4px; }
.plan { display: grid; grid-template-columns: auto 8em 1fr auto; gap: 8px; align-items: center;
  padding: 10px 12px; border: 1px solid var(--line); border-radius: 8px; margin: 6px 0; }
.plan span { color: var(--muted); font-size: 13px; }
.plan .price { font-style: normal; white-space: nowrap; }
.inline { display: inline-flex; gap: 6px; align-items: center; margin-right: 16px; }
.choices { list-style: none; padding: 0; margin: 0; }
.choices button { width: 100%; text-align: left; margin: 6px 0; }
.total { margin-top: 12px; }
dialog { border: 1px solid var(--line); border-radius: 10px; padding: 20px 24px; max-width: 560px; width: calc(100% - 32px);
  background: var(--card); color: var(--text); }
dialog::backdrop { background: rgba(0, 0, 0, .45); }
dialog h3 { font-size: 14px; margin: 16px 0 6px; }
.lines { width: 100%; border-collapse: collapse; font-size: 14px; }
.lines td { padding: 4px 0; border-bottom: 1px solid var(--line); }
.lines td.amount { text-align: right; white-space: nowrap; padding-left: 12px; }
.total-line { margin: 8px 0 0; text-align: right; }
.notice { margin-top: 16px; padding: 10px 14px; border-radius: 6px; background: var(--warn-bg); color: var(--warn-text); font-size: 14px; }
dialog .actions { justify-content: flex-end; }
/* タブ */
#view-app { max-width: 1040px; margin: 0 auto; }
#tab-billing { max-width: 760px; }
.tabs { display: flex; gap: 4px; flex-wrap: wrap; border-bottom: 1px solid var(--line); margin-bottom: 16px; }
.tabs button { border: none; border-bottom: 3px solid transparent; border-radius: 0; padding: 10px 14px; color: var(--muted); }
.tabs button[aria-selected=true] { color: var(--accent); border-bottom-color: var(--accent); font-weight: 600; }
.tabs button:hover { color: var(--text); }
.head-row { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; }
.head-row h1 { margin: 0; }
.filters, .inline-form { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; margin: 8px 0; }
.filters input, .inline-form input[type=text], .inline-form input[type=email] { width: auto; flex: 1 1 200px; margin-top: 0; }
.inline-form button { margin-top: 0; }
.inline-form .grow { flex: 1 1 260px; margin: 0; }
select { font: inherit; padding: 8px 10px; border: 1px solid var(--line); border-radius: 6px; background: var(--card); color: inherit; max-width: 100%; }
.table-wrap { overflow-x: auto; margin-top: 12px; }
table.list { width: 100%; border-collapse: collapse; font-size: 14px; }
table.list th, table.list td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
table.list th { color: var(--muted); font-weight: 600; white-space: nowrap; }
table.clickable tbody tr { cursor: pointer; }
table.clickable tbody tr:hover, table.clickable tbody tr:focus { background: var(--info-bg); outline: none; }
table.list tr.warning td { color: var(--warn-text); background: var(--warn-bg); }
.nowrap { white-space: nowrap; }
.row-actions { white-space: nowrap; text-align: right; }
.row-actions button + button { margin-left: 14px; }
.badge { display: inline-block; padding: 2px 8px; border-radius: 999px; font-size: 12px; white-space: nowrap; border: 1px solid var(--line); }
.badge.online { color: #15803d; border-color: #86efac; }
.badge.offline { color: var(--muted); }
.rows { list-style: none; padding: 0; margin: 8px 0; }
.rows li { display: flex; gap: 14px; align-items: center; padding: 8px 0; border-bottom: 1px solid var(--line); flex-wrap: wrap; }
.rows li .grow { flex: 1 1 auto; }
.rows .indent { padding-left: 1.5em; }
.rows.small li { font-size: 13px; padding: 4px 0; }
.narrow-form { max-width: 360px; }
.audit-filters { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 0 12px; align-items: end; }
.audit-filters label select, .audit-filters label input { display: block; width: 100%; margin-top: 4px; }
.audit-filters .actions { grid-column: 1 / -1; }
button.danger { background: var(--warn-text); border-color: var(--warn-text); color: #fff; margin-top: 8px; }
button.link.danger-link { color: var(--warn-text); }
.error-text { color: var(--warn-text); font-size: 14px; }
.actions.spread { justify-content: space-between; }
#device-dialog { max-width: 640px; }
@media (prefers-color-scheme: dark) {
  .badge.online { color: #86efac; border-color: #166534; }
}
@media (max-width: 560px) {
  .plan { grid-template-columns: auto 1fr; }
  .plan span, .plan .price { grid-column: 2; }
  .facts { grid-template-columns: 7em 1fr; }
}
.info { padding: 10px 14px; border-radius: 6px; margin: 16px 0 0; background: var(--info-bg); color: var(--info-text); font-size: 14px; }
.over-warning { margin-top: 12px; padding: 10px 14px; border-radius: 6px; border: 2px solid var(--warn-text); background: var(--warn-bg); color: var(--warn-text); font-size: 14px; }
.over-warning p { margin: 0 0 6px; font-weight: 600; }
.badge.blocked { color: var(--warn-text); border-color: var(--warn-text); }
.transfer-box { padding: 12px 16px; border-radius: 8px; margin-bottom: 16px; background: var(--info-bg); color: var(--info-text); border: 1px solid var(--accent); }
.transfer-box p { margin: 0; font-weight: 600; }