:root {
  --bg: #ffffff;
  --fg: #111111;
  --sub: #6b6b6b;
  --hair: #e4e4e4;
  --soft: #f6f6f6;
  --booked: #d9d9d9;
  --danger: #b3261e;
  --en: "Jost", "Helvetica Neue", Arial, sans-serif;
  --ja: "Noto Sans JP", "Hiragino Kaku Gothic ProN", sans-serif;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  background: var(--bg); color: var(--fg);
  font-family: var(--ja); font-weight: 300; line-height: 1.8; letter-spacing: .03em;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; }
button, input, select, textarea { font: inherit; color: inherit; letter-spacing: inherit; }
[hidden] { display: none !important; }
.wrap { width: min(960px, 100% - 32px); margin-inline: auto; }

/* header */
.app-header { border-bottom: 1px solid var(--hair); position: sticky; top: 0; background: #fff; z-index: 20; }
.app-header .wrap { display: flex; align-items: center; justify-content: space-between; height: 64px; gap: 16px; }
.app-header img { height: 30px; width: auto; mix-blend-mode: multiply; display: block; }
.app-header .who { font-size: 12px; color: var(--sub); display: flex; align-items: center; gap: 16px; }
.app-header .badge { font-family: var(--en); font-size: 11px; letter-spacing: .2em; border: 1px solid var(--fg); padding: 1px 8px; }

main { padding: 48px 0 96px; }
h1 { font-family: var(--en); font-weight: 400; font-size: 28px; letter-spacing: .14em; line-height: 1.2; }
h1 + .ja { font-size: 12px; color: var(--sub); letter-spacing: .2em; margin-top: 4px; }
h2 { font-size: 16px; font-weight: 500; letter-spacing: .1em; margin-bottom: 16px; }
.head { margin-bottom: 32px; }

/* tabs */
.tabs { display: flex; gap: 0; border-bottom: 1px solid var(--hair); margin-bottom: 36px; overflow-x: auto; }
.tabs button {
  background: none; border: 0; padding: 14px 20px; cursor: pointer; font-size: 14px; white-space: nowrap;
  border-bottom: 1.5px solid transparent; margin-bottom: -1px; color: var(--sub);
}
.tabs button[aria-selected="true"] { color: var(--fg); border-color: var(--fg); font-weight: 500; }

/* forms */
.auth-box { max-width: 420px; margin: 40px auto 0; }
.field { display: block; margin-bottom: 20px; }
.field > span { display: block; font-size: 12px; letter-spacing: .1em; margin-bottom: 6px; }
.field input, .field select, .field textarea {
  width: 100%; border: 1px solid #cfcfcf; background: #fff; padding: 12px 14px; font-size: 15px; border-radius: 0;
}
.field textarea { min-height: 88px; resize: vertical; }
.field input:focus, .field select:focus, .field textarea:focus { outline: 1.5px solid var(--fg); outline-offset: -1px; border-color: var(--fg); }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 12px;
  background: var(--fg); color: #fff; border: 1.5px solid var(--fg); padding: 14px 28px;
  font-size: 14px; letter-spacing: .12em; cursor: pointer; text-decoration: none; transition: opacity .2s;
}
.btn:hover { opacity: .85; }
.btn:disabled { opacity: .35; cursor: not-allowed; }
.btn.ghost { background: #fff; color: var(--fg); }
.btn.sm { padding: 8px 14px; font-size: 12px; letter-spacing: .06em; }
.btn.danger { background: #fff; color: var(--danger); border-color: var(--danger); }
.btn.block { width: 100%; }
.link { background: none; border: 0; text-decoration: underline; cursor: pointer; font-size: 13px; color: var(--sub); }
.msg { font-size: 13px; margin-top: 12px; min-height: 1.5em; }
.msg.err { color: var(--danger); }
.muted { color: var(--sub); font-size: 13px; }
.notice { border: 1px solid var(--fg); padding: 16px 20px; font-size: 14px; margin-bottom: 32px; white-space: pre-wrap; }
.panel { border: 1px solid var(--hair); padding: 24px; }

/* calendar */
.cal-nav { display: flex; align-items: center; justify-content: space-between; margin-bottom: 16px; }
.cal-nav .ym { font-family: var(--en); font-size: 20px; letter-spacing: .12em; }
.cal-nav button { background: none; border: 1px solid var(--fg); width: 36px; height: 36px; border-radius: 50%; cursor: pointer; }
.cal-nav button:disabled { opacity: .25; cursor: default; }
.cal { display: grid; grid-template-columns: repeat(7, 1fr); border-top: 1px solid var(--hair); border-left: 1px solid var(--hair); }
.cal .wd { text-align: center; font-size: 11px; padding: 6px 0; color: var(--sub); border-right: 1px solid var(--hair); border-bottom: 1px solid var(--hair); }
.cal .day {
  aspect-ratio: 1 / .85; border: 0; border-right: 1px solid var(--hair); border-bottom: 1px solid var(--hair);
  background: #fff; cursor: pointer; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 2px;
  font-family: var(--en); font-size: 15px;
}
.cal .day small { font-family: var(--ja); font-size: 10px; color: var(--sub); }
.cal .day:disabled { color: #c4c4c4; cursor: default; background: #fafafa; }
.cal .day.full small { color: #c4c4c4; }
.cal .day[aria-pressed="true"] { background: var(--fg); color: #fff; }
.cal .day[aria-pressed="true"] small { color: #ddd; }
.cal .empty { border-right: 1px solid var(--hair); border-bottom: 1px solid var(--hair); background: #fafafa; }

.book-grid { display: grid; grid-template-columns: 1.2fr 1fr; gap: 40px; align-items: start; }
.slots { display: grid; grid-template-columns: repeat(auto-fill, minmax(96px, 1fr)); gap: 8px; }
.slot {
  border: 1px solid var(--fg); background: #fff; padding: 10px 0; cursor: pointer; font-family: var(--en); font-size: 14px;
}
.slot:disabled { border-color: var(--hair); background: var(--soft); color: #b5b5b5; cursor: default; text-decoration: line-through; }
.slot.sel { background: var(--fg); color: #fff; }
.legend { display: flex; gap: 16px; font-size: 11px; color: var(--sub); margin: 12px 0 0; }
.legend i { display: inline-block; width: 10px; height: 10px; border: 1px solid var(--fg); margin-right: 4px; vertical-align: -1px; }
.legend i.b { background: var(--soft); border-color: var(--hair); }
.legend i.s { background: var(--fg); }

.summary dl { display: grid; grid-template-columns: 90px 1fr; font-size: 14px; margin-bottom: 20px; }
.summary dt, .summary dd { padding: 10px 0; border-bottom: 1px solid var(--hair); }
.summary dt { color: var(--sub); font-size: 12px; }
.summary .total { font-family: var(--en); font-size: 22px; }
.radios { display: grid; gap: 8px; margin-bottom: 20px; }
.radios label { display: flex; align-items: center; gap: 10px; border: 1px solid var(--hair); padding: 12px 14px; cursor: pointer; font-size: 14px; }
.radios label:has(input:checked) { border-color: var(--fg); }
.radios input { accent-color: var(--fg); }

/* list */
.list { display: grid; gap: 12px; }
.item { border: 1px solid var(--hair); padding: 20px 22px; display: grid; grid-template-columns: 1fr auto; gap: 8px 16px; align-items: center; }
.item.cancelled { opacity: .5; }
.item .when { font-weight: 500; font-size: 15px; }
.item .meta { font-size: 12px; color: var(--sub); }
.item .actions { display: flex; gap: 8px; flex-wrap: wrap; justify-content: flex-end; }
.item .extra { grid-column: 1 / -1; font-size: 13px; background: var(--soft); padding: 12px 14px; white-space: pre-wrap; }
.tag { display: inline-block; font-size: 11px; border: 1px solid var(--fg); padding: 0 8px; margin-right: 6px; letter-spacing: .05em; }
.tag.solid { background: var(--fg); color: #fff; }
.tag.warn { border-color: var(--danger); color: var(--danger); }

table.tbl { width: 100%; border-collapse: collapse; font-size: 13px; }
.tbl th, .tbl td { text-align: left; padding: 12px 8px; border-bottom: 1px solid var(--hair); vertical-align: middle; }
.tbl th { font-weight: 500; font-size: 12px; color: var(--sub); }
.tbl-wrap { overflow-x: auto; }
.row { display: flex; gap: 12px; flex-wrap: wrap; align-items: flex-end; }
.row .field { flex: 1 1 140px; }
.checks { display: flex; gap: 20px; flex-wrap: wrap; font-size: 14px; }
.checks input { accent-color: var(--fg); margin-right: 6px; }

#toast {
  position: fixed; left: 50%; bottom: 24px; transform: translate(-50%, 20px); opacity: 0; pointer-events: none;
  background: var(--fg); color: #fff; padding: 12px 22px; font-size: 13px; transition: .3s; z-index: 100; max-width: calc(100% - 32px);
}
#toast.show { opacity: 1; transform: translate(-50%, 0); }

@media (max-width: 760px) {
  main { padding: 32px 0 72px; }
  .book-grid { grid-template-columns: 1fr; gap: 32px; }
  .item { grid-template-columns: 1fr; }
  .item .actions { justify-content: flex-start; }
  .app-header .who .name { display: none; }
}