:root {
  --bg: #f5f6f8; --panel: #fff; --ink: #1c2230; --muted: #667085; --line: #e2e5ea;
  --brand: #5b1d8f; --brand-ink: #fff;
  --c: #1f6feb; --c-bg: #dbe8ff; --f: #b7791f; --f-bg: #fdeccb; --none: #eef0f3;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12151c; --panel: #1b202b; --ink: #e8ebf2; --muted: #97a0b2; --line: #2b3242;
    --brand: #a374d6; --brand-ink: #12151c;
    --c: #6ea8ff; --c-bg: #1b3358; --f: #f0b858; --f-bg: #4a3612; --none: #232a38;
  }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 14px/1.5 "Segoe UI", "Noto Sans Thai", system-ui, sans-serif; }
.muted { color: var(--muted); }
.top { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; justify-content: space-between; padding: 16px; background: var(--panel); border-bottom: 1px solid var(--line); }
.top h1 { margin: 0; font-size: 20px; }
.top p { margin: 0; }
.actions { display: flex; gap: 8px; flex-wrap: wrap; }
.btn { border: 1px solid var(--line); background: var(--panel); color: var(--ink); padding: 7px 14px; border-radius: 8px; cursor: pointer; font: inherit; }
.btn:hover { border-color: var(--brand); }
.btn.primary { background: var(--brand); color: var(--brand-ink); border-color: var(--brand); }
.btn.ghost { color: var(--muted); }
.btn:disabled { opacity: .45; cursor: not-allowed; }
main { max-width: 1200px; margin: 0 auto; padding: 16px; }

.tabs { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 12px; }
.tab { border: 1px solid var(--line); background: var(--panel); color: var(--ink); padding: 7px 14px; border-radius: 999px; cursor: pointer; font: inherit; }
.tab[aria-selected="true"] { background: var(--brand); color: var(--brand-ink); border-color: var(--brand); }

.controls { display: flex; flex-wrap: wrap; gap: 12px 16px; align-items: end; background: var(--panel); border: 1px solid var(--line); padding: 12px 14px; border-radius: 12px; margin-bottom: 12px; }
.controls label { display: flex; flex-direction: column; gap: 3px; font-size: 12px; color: var(--muted); }
.controls label.check { flex-direction: row; align-items: center; gap: 6px; color: var(--ink); font-size: 14px; }
select, input[type=file] { font: inherit; padding: 6px 8px; border: 1px solid var(--line); border-radius: 8px; background: var(--bg); color: var(--ink); }

.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); gap: 10px; margin-bottom: 14px; }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 12px 14px; }
.card .k { font-size: 12px; color: var(--muted); }
.card .v { font-size: 26px; font-weight: 700; line-height: 1.2; }
.card .s { font-size: 12px; color: var(--muted); }
.card.c .v { color: var(--c); } .card.f .v { color: var(--f); }

.month { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 12px; margin-bottom: 12px; }
.month h3 { margin: 0 0 8px; font-size: 15px; }
.grid { display: grid; grid-template-columns: repeat(7, 1fr); gap: 4px; }
.dow { text-align: center; font-size: 11px; color: var(--muted); }
.day { min-height: 58px; border-radius: 8px; padding: 4px 6px; background: var(--none); border: 1px solid transparent; font-size: 11px; display: flex; flex-direction: column; gap: 1px; cursor: default; text-align: left; color: var(--ink); font-family: inherit; }
.day .n { color: var(--muted); font-size: 11px; }
.day.blank { background: transparent; }
.day.has { cursor: pointer; background: var(--panel); border-color: var(--line); }
.day.has:hover, .day.sel { border-color: var(--brand); box-shadow: 0 0 0 1px var(--brand); }
.pill { border-radius: 4px; padding: 0 5px; font-weight: 600; width: fit-content; }
.pill.c { background: var(--c-bg); color: var(--c); }
.pill.f { background: var(--f-bg); color: var(--f); }

.listwrap { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 12px; }
.listhead { display: flex; justify-content: space-between; align-items: center; gap: 8px; }
.listhead h2 { margin: 0 0 8px; font-size: 16px; }
.tablewrap { overflow: auto; max-height: 440px; }
.listwrap { margin-bottom: 14px; }
#calendars { margin-bottom: 14px; }
.calnav { display: flex; align-items: center; justify-content: space-between; gap: 8px; margin-bottom: 10px; }
.calnav .ttl { font-weight: 600; text-align: center; flex: 1; }
.calnav .btn { min-width: 44px; font-size: 16px; }
.calgrid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.calgrid .month { margin-bottom: 0; }
@media (max-width: 800px) { .calgrid { grid-template-columns: 1fr; } }
table { border-collapse: collapse; width: 100%; min-width: 760px; }
th, td { padding: 6px 8px; border-bottom: 1px solid var(--line); text-align: left; white-space: nowrap; }
th { font-size: 12px; color: var(--muted); cursor: pointer; user-select: none; position: sticky; top: 0; background: var(--panel); }
td.num, th.num { text-align: right; }
td.seat b { padding: 1px 8px; border-radius: 4px; }
td.seat.c b { background: var(--c-bg); color: var(--c); }
td.seat.f b { background: var(--f-bg); color: var(--f); }
td.zero { color: var(--muted); }
.note { font-size: 12px; margin: 8px 0 0; }

.overview td, .overview th { cursor: default; }

dialog { border: 1px solid var(--line); border-radius: 14px; background: var(--panel); color: var(--ink); padding: 0; width: min(620px, 94vw); }
dialog::backdrop { background: rgba(0,0,0,.45); }
.dlg-body { padding: 18px; display: flex; flex-direction: column; gap: 10px; }
.dlg-body h2 { margin: 0; }
.dlg-actions { display: flex; justify-content: flex-end; gap: 8px; }
.pv { border: 1px solid var(--line); border-radius: 8px; padding: 8px 10px; font-size: 13px; }
.pv.err { border-color: #d92d20; color: #d92d20; }
.pv label { display: inline-flex; gap: 6px; align-items: center; color: var(--muted); }
.pv input[type=date] { font: inherit; background: var(--bg); color: var(--ink); border: 1px solid var(--line); border-radius: 6px; padding: 2px 6px; }
.toast { position: fixed; bottom: 18px; left: 50%; transform: translateX(-50%); background: var(--ink); color: var(--bg); padding: 10px 18px; border-radius: 10px; z-index: 10; }

@media (max-width: 600px) {
  .day { min-height: 48px; padding: 3px; }
  .pill { padding: 0 3px; }
}