:root {
  --bg: #f3f5f7;
  --paper: #ffffff;
  --ink: #1d2b2a;
  --muted: #6a7876;
  --line: #dde3e2;
  --teal: #0f766e;
  --teal-2: #14867c;
  --teal-soft: #d7efec;
  --amber: #b4690e;
  --amber-soft: #fdf1dd;
  --red: #b42318;
  --red-soft: #fdecea;
  --green: #197a4b;
  --shadow: 0 1px 3px rgba(20, 40, 38, .08), 0 6px 20px rgba(20, 40, 38, .05);
  --radius: 12px;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "PingFang TC", "Noto Sans TC", "Microsoft JhengHei", system-ui, sans-serif;
  color: var(--ink);
  background: var(--bg);
  font-size: 14px;
  line-height: 1.5;
}
h1, h2 { margin: 0; }

/* ---- topbar ---- */
.topbar {
  position: sticky; top: 0; z-index: 10;
  background: var(--teal);
  color: #fff;
  padding: 12px 20px;
  box-shadow: var(--shadow);
}
.brand { display: flex; align-items: baseline; gap: 12px; flex-wrap: wrap; }
.brand h1 { font-size: 19px; letter-spacing: .5px; }
.brand .sub { font-size: 12px; opacity: .85; }
.topctrl { display: flex; gap: 14px; align-items: center; flex-wrap: wrap; margin-top: 10px; }
.tabs { display: flex; gap: 6px; }
.tab {
  border: 1px solid rgba(255, 255, 255, .35); background: transparent; color: #fff;
  padding: 6px 16px; border-radius: 999px; cursor: pointer; font-size: 14px; font-weight: 600;
}
.tab.active { background: #fff; color: var(--teal); border-color: #fff; }
.month { display: flex; gap: 10px; font-size: 13px; }
.month label { display: flex; align-items: center; gap: 4px; }
.month input { width: 68px; }
.actions { display: flex; gap: 8px; margin-left: auto; flex-wrap: wrap; }

input, select {
  font: inherit; padding: 5px 8px; border: 1px solid var(--line); border-radius: 8px;
  background: var(--paper); color: var(--ink);
}
input:focus, select:focus { outline: 2px solid var(--teal-soft); border-color: var(--teal); }

.btn {
  border: 1px solid rgba(255, 255, 255, .5); background: rgba(255, 255, 255, .12); color: #fff;
  padding: 6px 14px; border-radius: 8px; cursor: pointer; font-weight: 600; font-size: 13px;
}
.btn:hover { background: rgba(255, 255, 255, .22); }
.btn.primary { background: #fff; color: var(--teal); border-color: #fff; }
.btn.ghost { background: transparent; }
.btn.small { padding: 3px 10px; font-size: 12px; color: var(--teal); background: var(--teal-soft); border-color: var(--teal-soft); }

/* ---- layout ---- */
main { display: grid; grid-template-columns: minmax(340px, 420px) 1fr; gap: 16px; padding: 16px 20px; align-items: start; }
@media (max-width: 900px) { main { grid-template-columns: 1fr; } }
.pane { background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); overflow: hidden; }
.pane-title { font-size: 14px; padding: 10px 16px; border-bottom: 1px solid var(--line); background: #fafcfb; color: var(--muted); letter-spacing: .5px; }
.config-pane { position: sticky; top: 128px; }
@media (max-width: 900px) { .config-pane { position: static; } }

/* ---- config ---- */
.sec { border-bottom: 1px solid var(--line); }
.sec > summary { cursor: pointer; padding: 10px 16px; font-weight: 700; color: var(--teal-2); list-style: none; }
.sec > summary::before { content: "▸ "; }
.sec[open] > summary::before { content: "▾ "; }
.sec-body { padding: 6px 16px 14px; display: flex; flex-direction: column; gap: 10px; }
.field { display: flex; flex-direction: column; gap: 4px; font-size: 13px; }
.field > span { color: var(--muted); font-size: 12px; }
.field input, .field select { width: 100%; }
.hint { margin: 0; font-size: 12px; color: var(--muted); }

.grid { border-collapse: collapse; width: 100%; }
.grid th, .grid td { border: 1px solid var(--line); padding: 3px; text-align: center; }
.grid th { background: #f4f8f7; font-weight: 600; font-size: 12px; color: var(--muted); white-space: nowrap; }
.grid td input { width: 44px; text-align: center; padding: 3px; }

.chk-row { display: flex; flex-wrap: wrap; gap: 10px; }
.chk { display: inline-flex; align-items: center; gap: 4px; font-size: 13px; cursor: pointer; }
.chk.block { padding: 4px 0; }
.chk input, .cell-chk input { width: auto; }
.chk-row.inline { gap: 8px; }
.chk-row.inline .chk { font-size: 12px; gap: 3px; }

.people-block { margin-bottom: 10px; }
.person-entry { padding: 8px 0; border-bottom: 1px dashed var(--line); }
.person-entry:first-child { padding-top: 2px; }
.person-label { font-size: 12px; color: var(--muted); margin-bottom: 4px; }
.person-namerow { display: flex; align-items: center; gap: 6px; }
.person-namerow .person-name { flex: 1 1 auto; min-width: 0; }
.person-namerow .x { flex: 0 0 auto; border: none; background: var(--red-soft); color: var(--red); border-radius: 6px; width: 28px; height: 28px; cursor: pointer; font-size: 16px; line-height: 1; }
.person-namerow .x:hover { background: #f9d9d4; }
.shift-title { font-size: 12px; color: var(--teal-2); font-weight: 600; margin: 8px 0 4px; }
.btn.small.add { margin-top: 8px; }

.forced-list { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 6px; }
.chip { background: var(--teal-soft); color: var(--teal); border-radius: 999px; padding: 2px 6px 2px 10px; font-size: 12px; display: inline-flex; align-items: center; gap: 4px; }
.chip .x { border: none; background: transparent; color: var(--teal); cursor: pointer; font-size: 14px; line-height: 1; padding: 0 2px; }
.forced-add { display: flex; gap: 6px; align-items: center; }
.forced-add select { width: auto; }

.notes { background: var(--amber-soft); border: 1px solid #f0dcb8; border-radius: 8px; padding: 8px 12px; }
.notes-title { font-size: 12px; font-weight: 700; color: var(--amber); margin-bottom: 4px; }
.notes ul { margin: 0; padding-left: 18px; }
.notes li { font-size: 12px; color: #7a5514; margin: 2px 0; }

/* ---- result ---- */
#result { padding: 14px 16px; }
.empty { color: var(--muted); text-align: center; padding: 40px 0; }
.stats { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 12px; }
.stat-card { flex: 1; min-width: 200px; border: 1px solid var(--line); border-radius: 10px; padding: 10px 14px; background: #fafcfb; }
.stat-name { font-weight: 700; color: var(--teal-2); margin-bottom: 4px; }
.stat-row { font-size: 14px; } .stat-row b { font-size: 18px; color: var(--ink); }
.stat-sub { font-size: 12px; color: var(--muted); margin-top: 4px; }

.warn { background: var(--amber-soft); border: 1px solid #f0dcb8; border-radius: 10px; padding: 4px 8px; margin-bottom: 12px; }
.warn summary { cursor: pointer; font-weight: 700; color: var(--amber); padding: 6px; }
.warn ul { margin: 4px 0 8px; padding-left: 20px; }
.warn li { font-size: 12.5px; color: #7a5514; margin: 3px 0; }
.ok { background: #e8f6ee; color: var(--green); border: 1px solid #b9e2c9; border-radius: 10px; padding: 8px 12px; margin-bottom: 12px; font-weight: 600; }
.info { background: var(--teal-soft); color: var(--teal); border: 1px solid #b7ddd8; border-radius: 10px; padding: 8px 12px; margin-bottom: 12px; font-size: 12.5px; }

.sched-wrap { overflow-x: auto; }
.sched { border-collapse: collapse; width: 100%; min-width: 520px; }
.sched th, .sched td { border: 1px solid var(--line); padding: 6px 8px; vertical-align: top; }
.sched > tr:first-child th, .sched tr:first-child th { background: var(--teal); color: #fff; text-align: center; position: sticky; top: 0; }
.sched th:first-child { width: 68px; text-align: left; background: #f4f8f7; color: var(--ink); }
.sched th small { display: block; font-weight: 400; color: var(--muted); font-size: 11px; }
.sched tr.holiday th:first-child { background: var(--amber-soft); }
.sched td.closed { background: repeating-linear-gradient(45deg, #f6f8f7, #f6f8f7 6px, #eef2f1 6px, #eef2f1 12px); text-align: center; }
.dash { color: var(--muted); }
.cell-chk { display: flex; align-items: center; gap: 4px; font-size: 13px; padding: 2px 4px; border-radius: 6px; cursor: pointer; }
.cell-chk.on { background: var(--teal-soft); color: var(--teal); font-weight: 600; }
.cell-need { font-size: 10.5px; color: var(--muted); margin-top: 4px; border-top: 1px dashed var(--line); padding-top: 3px; }