:root {
  --bg: #f4f5f7;
  --surface: #ffffff;
  --text: #1c2430;
  --muted: #5d6877;
  --line: #dde1e7;
  --primary: #1f5fae;
  --primary-dark: #174a88;
  --danger: #b42318;
  --ok: #1d7a46;
  --radius: 10px;
  --shadow: 0 1px 2px rgba(16, 24, 40, .06), 0 1px 3px rgba(16, 24, 40, .08);
  color-scheme: light;
}

* { box-sizing: border-box; }

[hidden] { display: none !important; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.55 system-ui, -apple-system, "Segoe UI", "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", sans-serif;
}

body.loading main, body.loading #topbar { visibility: hidden; }

a { color: var(--primary); }

h1 { font-size: 1.35rem; margin: 0; }
h2 { font-size: 1.1rem; margin: 0 0 .5rem; }

/* ---------- 頂部選單 ---------- */

#topbar {
  background: var(--surface);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 10;
}
.topbar-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 8px 16px;
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}
.brand { font-weight: 700; color: var(--text); text-decoration: none; font-size: 1.05rem; }
#topbar nav { display: flex; gap: 4px; flex: 1; }
#topbar nav a {
  text-decoration: none;
  color: var(--muted);
  padding: 6px 10px;
  border-radius: 8px;
}
#topbar nav a.active { background: #e8f0fb; color: var(--primary); font-weight: 600; }
.who { display: flex; align-items: center; gap: 8px; }
.who small { color: var(--muted); margin-left: 4px; font-size: .8rem; }

/* ---------- 版面 ---------- */

main { max-width: 1100px; margin: 0 auto; padding: 16px; }

.page-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}

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

.stack { display: flex; flex-direction: column; gap: 12px; }
.row-end { display: flex; justify-content: flex-end; gap: 8px; flex-wrap: wrap; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
@media (max-width: 640px) { .grid-2 { grid-template-columns: 1fr; } }

.muted { color: var(--muted); }
.empty { color: var(--muted); text-align: center; padding: 32px 8px; }

/* ---------- 表單 ---------- */

label { display: flex; flex-direction: column; gap: 4px; font-size: .9rem; color: var(--muted); }

input, select, textarea {
  font: inherit;
  color: var(--text);
  background: #fff;
  border: 1px solid #c5ccd6;
  border-radius: 8px;
  padding: 9px 11px;
  width: 100%;
  min-width: 0;
}
textarea { resize: vertical; min-height: 80px; }
input:focus, select:focus, textarea:focus {
  outline: 2px solid rgba(31, 95, 174, .35);
  outline-offset: 0;
  border-color: var(--primary);
}

.form-error {
  color: var(--danger);
  background: #fdecea;
  border-radius: 8px;
  padding: 8px 12px;
  margin: 0;
  font-size: .9rem;
}

.btn {
  font: inherit;
  font-weight: 600;
  border: 1px solid var(--primary);
  background: var(--primary);
  color: #fff;
  border-radius: 8px;
  padding: 9px 16px;
  cursor: pointer;
  white-space: nowrap;
}
.btn:hover { background: var(--primary-dark); }
.btn:disabled { opacity: .55; cursor: default; }
.btn-ghost { background: #fff; color: var(--text); border-color: #c5ccd6; }
.btn-ghost:hover { background: #f0f2f5; }
.btn-ok { background: var(--ok); border-color: var(--ok); }
.btn-ok:hover { background: #166239; }
.btn-danger { background: #fff; color: var(--danger); border-color: #e6b3ae; }
.btn-danger:hover { background: #fdecea; }
.btn-small { padding: 5px 10px; font-size: .88rem; }
.btn-block { width: 100%; }

.linklike {
  font: inherit;
  background: none;
  border: 0;
  padding: 4px;
  cursor: pointer;
  color: var(--text);
}

/* ---------- 狀態標籤 ---------- */

.badge {
  display: inline-block;
  font-size: .8rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 999px;
  white-space: nowrap;
}
.badge-pending { background: #fff4e0; color: #8a5300; }
.badge-assigned { background: #e8f0fb; color: var(--primary); }
.badge-done { background: #e5f5ec; color: var(--ok); }
.badge-cancelled { background: #eef0f3; color: var(--muted); }
.badge-paid { background: #e5f5ec; color: var(--ok); }
.badge-unpaid { background: #fdecea; color: var(--danger); }
.badge-off { background: #eef0f3; color: var(--muted); }

/* ---------- 分頁籤 ---------- */

.tabs { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 12px; }
.tabs button {
  font: inherit;
  font-size: .92rem;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--muted);
  border-radius: 999px;
  padding: 5px 14px;
  cursor: pointer;
}
.tabs button.active { background: var(--primary); border-color: var(--primary); color: #fff; }

.toolbar { display: flex; gap: 8px; margin-bottom: 12px; }
.toolbar input { max-width: 360px; }

/* ---------- 水電單列表 ---------- */

.order-list { display: flex; flex-direction: column; gap: 8px; }
.order-item {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 4px 12px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 12px 14px;
  text-decoration: none;
  color: inherit;
  box-shadow: var(--shadow);
}
.order-item:hover { border-color: #a9b7c9; }
.order-item .title { font-weight: 600; }
.order-item .title .no { color: var(--muted); font-weight: 400; margin-right: 6px; }
.order-item .meta { color: var(--muted); font-size: .88rem; grid-column: 1 / -1; }
.order-item .meta span + span::before { content: "・"; }
.order-item .right { text-align: right; display: flex; gap: 6px; align-items: start; justify-content: flex-end; flex-wrap: wrap; }
.order-item .desc {
  grid-column: 1 / -1;
  font-size: .92rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* ---------- 水電單內容 ---------- */

.detail-grid { display: grid; grid-template-columns: 7em 1fr; gap: 6px 12px; margin: 0; }
.detail-grid dt { color: var(--muted); }
.detail-grid dd { margin: 0; word-break: break-word; white-space: pre-wrap; }

.notes { list-style: none; margin: 0 0 12px; padding: 0; display: flex; flex-direction: column; gap: 10px; }
.notes li { border-left: 3px solid var(--line); padding: 2px 0 2px 10px; }
.notes .note-head { font-size: .85rem; color: var(--muted); }
.notes .note-body { white-space: pre-wrap; word-break: break-word; }

.amount-row { display: flex; gap: 8px; align-items: end; flex-wrap: wrap; }
.amount-row label { flex: 1; min-width: 140px; }

/* ---------- 帳號表格 ---------- */

.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 10px 8px; border-bottom: 1px solid var(--line); vertical-align: middle; }
th { font-size: .85rem; color: var(--muted); font-weight: 600; }
td .actions { display: flex; gap: 6px; flex-wrap: wrap; }
tr.inactive td { color: var(--muted); }

/* ---------- 登入頁 ---------- */

.auth-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
}
.auth-card { width: 100%; max-width: 380px; }
.auth-card h1 { margin-bottom: 4px; }

/* ---------- 對話框、提示 ---------- */

dialog {
  border: 0;
  border-radius: var(--radius);
  padding: 20px;
  width: min(420px, calc(100vw - 32px));
  box-shadow: 0 10px 30px rgba(16, 24, 40, .25);
}
dialog::backdrop { background: rgba(16, 24, 40, .45); }

#toast {
  position: fixed;
  left: 50%;
  bottom: 24px;
  transform: translate(-50%, 20px);
  background: #1c2430;
  color: #fff;
  padding: 10px 18px;
  border-radius: 8px;
  opacity: 0;
  pointer-events: none;
  transition: opacity .2s, transform .2s;
  max-width: calc(100vw - 32px);
  z-index: 100;
}
#toast.show { opacity: 1; transform: translate(-50%, 0); }
#toast.error { background: var(--danger); }

.fatal { max-width: 480px; margin: 80px auto; padding: 16px; text-align: center; }

@media (max-width: 560px) {
  .topbar-inner { gap: 8px; }
  #topbar nav { order: 3; flex-basis: 100%; }
  .brand { flex: 1; }
  .detail-grid { grid-template-columns: 5.5em 1fr; }
}