:root {
  --bg: #f6f7fb;
  --card: #ffffff;
  --text: #1c1f2a;
  --muted: #6b7083;
  --line: #e3e5ee;
  --accent: #4f46e5;
  --accent-soft: #eceafd;
  --danger: #d6334a;
  --ok: #148a5b;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(20, 22, 40, .06), 0 4px 16px rgba(20, 22, 40, .05);
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12131a;
    --card: #1b1d27;
    --text: #e9eaf2;
    --muted: #9a9eb3;
    --line: #2c2f3d;
    --accent: #8b85ff;
    --accent-soft: #2a2850;
    --danger: #ff6b7f;
    --ok: #3ccf91;
    --shadow: none;
  }
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang TC", "Noto Sans TC", sans-serif;
}
a { color: var(--accent); text-decoration: none; }
h1 { font-size: 1.5rem; margin: 0 0 .25rem; }
h2 { font-size: 1.15rem; margin: 0 0 .75rem; }
.muted { color: var(--muted); }
.center { text-align: center; }
.small { font-size: .85rem; }

.topbar {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 12px 16px; background: var(--card); border-bottom: 1px solid var(--line);
  position: sticky; top: 0; z-index: 5;
}
.brand { font-weight: 700; font-size: 1.1rem; color: var(--text); }
#nav { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }

main { max-width: 860px; margin: 0 auto; padding: 20px 16px 60px; }
.narrow { max-width: 420px; margin: 0 auto; }

.card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 20px; margin-bottom: 16px;
}

label { display: block; font-weight: 600; font-size: .9rem; margin: 12px 0 4px; }
input, select, textarea {
  width: 100%; padding: 10px 12px; font: inherit; color: var(--text);
  background: var(--bg); border: 1px solid var(--line); border-radius: 10px;
}
input:focus, select:focus, textarea:focus { outline: 2px solid var(--accent); outline-offset: -1px; }
textarea { min-height: 80px; resize: vertical; }
.hint { font-size: .8rem; color: var(--muted); margin-top: 4px; }

button, .btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  padding: 9px 16px; font: inherit; font-weight: 600; cursor: pointer;
  border-radius: 10px; border: 1px solid var(--accent); background: var(--accent); color: #fff;
}
button:disabled { opacity: .55; cursor: default; }
.btn-ghost { background: transparent; color: var(--accent); }
.btn-danger { background: transparent; color: var(--danger); border-color: var(--danger); }
.btn-small { padding: 5px 10px; font-size: .85rem; }
.btn-block { width: 100%; margin-top: 16px; }
.row { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.spread { justify-content: space-between; }

.tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--line); margin-bottom: 16px; overflow-x: auto; }
.tabs a {
  padding: 10px 14px; color: var(--muted); font-weight: 600; white-space: nowrap;
  border-bottom: 2px solid transparent; margin-bottom: -1px;
}
.tabs a.active { color: var(--accent); border-color: var(--accent); }

.list-item {
  display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap;
  padding: 14px 0; border-bottom: 1px solid var(--line);
}
.list-item:last-child { border-bottom: 0; }
.pill {
  display: inline-block; padding: 2px 8px; border-radius: 99px; font-size: .78rem; font-weight: 600;
  background: var(--accent-soft); color: var(--accent);
}
.pill.off { background: var(--line); color: var(--muted); }

/* availability editor */
.day-row { display: grid; grid-template-columns: 110px 1fr; gap: 10px; padding: 10px 0; border-bottom: 1px solid var(--line); }
.day-row:last-child { border-bottom: 0; }
.day-name { display: flex; align-items: center; gap: 8px; font-weight: 600; }
.day-name input { width: auto; }
.range { display: flex; gap: 6px; align-items: center; margin-bottom: 6px; }
.range input { width: 120px; padding: 7px 8px; }

/* booking page */
.booker { display: grid; grid-template-columns: 1fr; gap: 16px; }
@media (min-width: 760px) { .booker { grid-template-columns: 240px 1fr; } }
.event-info h1 { font-size: 1.3rem; }
.event-info p { margin: 6px 0; }
.pick { display: grid; grid-template-columns: 1fr; gap: 16px; }
@media (min-width: 620px) { .pick { grid-template-columns: 1fr 180px; } }

.cal-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 8px; }
.cal-head button { padding: 4px 12px; }
.cal { display: grid; grid-template-columns: repeat(7, 1fr); gap: 4px; text-align: center; }
.cal .dow { font-size: .75rem; color: var(--muted); padding: 4px 0; }
.cal .day {
  aspect-ratio: 1; display: flex; align-items: center; justify-content: center;
  border-radius: 50%; border: 0; padding: 0; font-weight: 500;
  background: transparent; color: var(--muted); cursor: default;
}
.cal .day.has { background: var(--accent-soft); color: var(--accent); font-weight: 700; cursor: pointer; }
.cal .day.sel { background: var(--accent); color: #fff; }
.slots { display: flex; flex-direction: column; gap: 8px; max-height: 360px; overflow-y: auto; }
.slots button { background: transparent; color: var(--accent); }
.slots button:hover { background: var(--accent-soft); }

.tz-select { margin-top: 12px; }
.success { font-size: 2.5rem; }

.toast {
  position: fixed; left: 50%; bottom: 24px; transform: translateX(-50%);
  background: var(--text); color: var(--bg); padding: 10px 18px; border-radius: 10px;
  font-weight: 600; z-index: 20; max-width: calc(100% - 32px);
}
.toast.error { background: var(--danger); color: #fff; }

.empty { padding: 24px 0; text-align: center; color: var(--muted); }
code.link { word-break: break-all; font-size: .85rem; }