:root {
  --bg: #f5f6f3;
  --surface: #ffffff;
  --surface-2: #eef1ec;
  --text: #1d2420;
  --muted: #65706a;
  --border: #dde2dc;
  --accent: #0e8a5f;
  --accent-ink: #ffffff;
  --accent-soft: #dcf2e8;
  --pos: #0e7a52;
  --neg: #c2410c;
  --warn-bg: #fff4dc;
  --warn-ink: #8a5a00;
  --danger: #c0262d;
  --room: #3b6fd8;
  --meal: #d9822b;
  --other: #7a5bc7;
  --radius: 12px;
  --shadow: 0 1px 2px rgb(0 0 0 / 0.05), 0 2px 10px rgb(0 0 0 / 0.04);
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111513;
    --surface: #1a201d;
    --surface-2: #232b27;
    --text: #e7ece9;
    --muted: #97a39c;
    --border: #2f3934;
    --accent: #2fbf87;
    --accent-ink: #062016;
    --accent-soft: #183a2c;
    --pos: #4fd39c;
    --neg: #ff9a62;
    --warn-bg: #3a2f14;
    --warn-ink: #ffd27a;
    --danger: #ff6b6b;
    --room: #7ea4ff;
    --meal: #f3a55b;
    --other: #b39cff;
    --shadow: none;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang TC", "Noto Sans TC", "Microsoft JhengHei", "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.5;
  padding-bottom: env(safe-area-inset-bottom);
}

button, input, select, textarea { font: inherit; color: inherit; }

.num { font-variant-numeric: tabular-nums; }

/* ---------- 頂部 ---------- */
.topbar {
  position: sticky; top: 0; z-index: 20;
  display: flex; align-items: center; gap: 8px;
  padding: 10px 16px; padding-top: max(10px, env(safe-area-inset-top));
  background: var(--surface); border-bottom: 1px solid var(--border);
}
.brand { display: flex; align-items: center; gap: 6px; font-weight: 700; font-size: 18px; white-space: nowrap; }
.brand img { border-radius: 7px; }
.brand small { color: var(--muted); font-weight: 500; font-size: 12px; }
#activity-select { flex: 1; min-width: 0; margin-left: 8px; }

.icon-btn {
  border: 1px solid var(--border); background: var(--surface); border-radius: 10px;
  width: 40px; height: 40px; font-size: 20px; cursor: pointer; flex: none;
}
.menu {
  position: absolute; right: 12px; top: calc(100% + 4px);
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  box-shadow: 0 8px 30px rgb(0 0 0 / 0.15); padding: 6px; min-width: 200px;
  display: flex; flex-direction: column;
}
.menu[hidden] { display: none; }
.menu button { text-align: left; background: none; border: 0; padding: 10px 12px; border-radius: 8px; cursor: pointer; }
.menu button:hover { background: var(--surface-2); }
.menu hr { border: 0; border-top: 1px solid var(--border); margin: 4px 0; width: 100%; }
.danger { color: var(--danger) !important; }

.tabs {
  position: sticky; top: 61px; z-index: 10;
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 4px;
  padding: 8px 16px; background: var(--bg);
}
.tabs button {
  border: 0; background: transparent; padding: 9px 4px; border-radius: 10px;
  color: var(--muted); font-weight: 600; cursor: pointer; font-size: 15px;
}
.tabs button[aria-selected="true"] { background: var(--surface); color: var(--accent); box-shadow: var(--shadow); }

main { max-width: 760px; margin: 0 auto; padding: 4px 16px 96px; }

/* ---------- 共用 ---------- */
.card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 16px; margin-bottom: 14px; box-shadow: var(--shadow);
}
.card h2 { font-size: 16px; margin: 0 0 12px; display: flex; align-items: center; gap: 8px; }
.card h2 .hint { margin-left: auto; }
.hint { color: var(--muted); font-size: 13px; font-weight: 400; }

.field { display: block; margin-bottom: 14px; }
.field > .hint { display: block; margin-bottom: 4px; }
label.field > span { display: block; font-size: 13px; color: var(--muted); margin-bottom: 4px; }

input[type="text"], input[type="number"], select, textarea {
  width: 100%; padding: 10px 12px; border: 1px solid var(--border); border-radius: 10px;
  background: var(--surface); min-height: 44px;
}
input:focus, select:focus, textarea:focus, button:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }
input.invalid { border-color: var(--danger); }
textarea { resize: vertical; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  border: 1px solid var(--border); background: var(--surface); border-radius: 10px;
  padding: 10px 14px; min-height: 44px; cursor: pointer; font-weight: 600;
}
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.btn.ghost { background: transparent; }
.btn.small { min-height: 34px; padding: 6px 10px; font-size: 14px; }
.btn.block { width: 100%; }
.btn.danger-outline { color: var(--danger); border-color: color-mix(in srgb, var(--danger) 40%, var(--border)); }
.btn:disabled { opacity: 0.5; cursor: default; }

.row { display: flex; gap: 8px; align-items: center; }
.grow { flex: 1; min-width: 0; }
.stack > * + * { margin-top: 8px; }

.seg { display: inline-flex; background: var(--surface-2); border-radius: 10px; padding: 3px; gap: 2px; width: 100%; }
.seg button { flex: 1; border: 0; background: transparent; padding: 8px 6px; border-radius: 8px; cursor: pointer; font-weight: 600; color: var(--muted); font-size: 14px; }
.seg button[aria-pressed="true"] { background: var(--surface); color: var(--text); box-shadow: var(--shadow); }

.chip { display: inline-block; font-size: 12px; font-weight: 700; padding: 2px 8px; border-radius: 999px; white-space: nowrap; }
.chip.room { color: var(--room); background: color-mix(in srgb, var(--room) 14%, transparent); }
.chip.meal { color: var(--meal); background: color-mix(in srgb, var(--meal) 14%, transparent); }
.chip.other { color: var(--other); background: color-mix(in srgb, var(--other) 14%, transparent); }

.pos { color: var(--pos); }
.neg { color: var(--neg); }

.alert { background: var(--warn-bg); color: var(--warn-ink); border-radius: 10px; padding: 10px 12px; font-size: 14px; margin-bottom: 12px; }
.ok-badge { display: inline-flex; align-items: center; gap: 6px; font-size: 13px; font-weight: 700; padding: 4px 10px; border-radius: 999px; background: var(--accent-soft); color: var(--pos); }
.bad-badge { display: inline-flex; gap: 6px; font-size: 13px; font-weight: 700; padding: 4px 10px; border-radius: 999px; background: var(--warn-bg); color: var(--danger); }

.empty { text-align: center; color: var(--muted); padding: 28px 12px; }
.empty .btn { margin-top: 12px; }

/* ---------- 家庭設定 ---------- */
.weights { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.family {
  display: grid; grid-template-columns: 1fr auto auto; gap: 8px 10px; align-items: center;
  padding: 12px 0; border-top: 1px solid var(--border);
}
.family:first-of-type { border-top: 0; padding-top: 0; }
.family .name { grid-column: 1 / 3; }
.family .del { grid-column: 3; grid-row: 1; }
.family .counts { grid-column: 1 / 4; display: flex; gap: 14px; align-items: center; flex-wrap: wrap; }
.stepper { display: inline-flex; align-items: center; gap: 6px; }
.stepper > span { font-size: 14px; color: var(--muted); }
.stepper button { width: 34px; height: 34px; border-radius: 50%; border: 1px solid var(--border); background: var(--surface); cursor: pointer; font-size: 18px; line-height: 1; }
.stepper output { min-width: 22px; text-align: center; font-weight: 700; }
.shares { margin-left: auto; font-size: 13px; color: var(--muted); }

/* ---------- 費用 ---------- */
.summary-bar { display: flex; justify-content: space-between; align-items: baseline; margin-bottom: 10px; }
.summary-bar strong { font-size: 22px; }
.expense {
  display: block; width: 100%; text-align: left; cursor: pointer;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 12px 14px; margin-bottom: 10px; box-shadow: var(--shadow);
}
.expense:hover { border-color: var(--accent); }
.expense .top { display: flex; align-items: center; gap: 8px; }
.expense .title { font-weight: 700; flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.expense .amt { font-weight: 700; font-size: 17px; }
.expense .meta { color: var(--muted); font-size: 13px; margin-top: 4px; }
.expense .err { color: var(--danger); font-size: 13px; margin-top: 4px; }
.expense.has-error { border-color: var(--danger); }

.fab {
  position: fixed; right: max(16px, calc(50% - 364px)); bottom: calc(20px + env(safe-area-inset-bottom));
  border-radius: 999px; padding: 14px 20px; box-shadow: 0 6px 20px rgb(0 0 0 / 0.2); z-index: 5;
}

/* ---------- 費用編輯視窗 ---------- */
dialog {
  width: min(640px, 100%); max-height: 100dvh; margin: auto auto 0; padding: 0; border: 0;
  border-radius: 18px 18px 0 0; background: var(--bg); color: var(--text);
}
@media (min-width: 700px) { dialog { margin: auto; border-radius: 18px; max-height: 92dvh; } }
dialog::backdrop { background: rgb(0 0 0 / 0.45); }
.dlg { display: flex; flex-direction: column; max-height: inherit; }
.dlg-head { display: flex; align-items: center; gap: 8px; padding: 14px 16px; border-bottom: 1px solid var(--border); background: var(--surface); }
.dlg-head h3 { margin: 0; font-size: 17px; flex: 1; }
.dlg-body { padding: 16px; overflow-y: auto; }
.dlg-foot { display: flex; gap: 8px; padding: 12px 16px calc(12px + env(safe-area-inset-bottom)); border-top: 1px solid var(--border); background: var(--surface); }
.dlg-foot .grow { flex: 1; }

.pay-row { display: grid; grid-template-columns: 1fr 1fr 40px; gap: 6px; margin-bottom: 8px; }
.pay-row .note { grid-column: 1 / 3; }
.pay-row .x { grid-row: 1; grid-column: 3; }
.pay-row + .pay-row { padding-top: 8px; border-top: 1px dashed var(--border); }
.x { border: 0; background: var(--surface-2); border-radius: 10px; cursor: pointer; font-size: 18px; color: var(--muted); }

.split-list .split-row { display: flex; align-items: center; gap: 10px; padding: 8px 0; border-top: 1px solid var(--border); }
.split-list .split-row:first-child { border-top: 0; }
.split-row label { display: flex; align-items: center; gap: 10px; flex: 1; min-width: 0; cursor: pointer; }
.split-row input[type="checkbox"] { width: 22px; height: 22px; accent-color: var(--accent); flex: none; }
.split-row .who { flex: 1; min-width: 0; }
.split-row .who small { color: var(--muted); display: block; font-size: 12px; }
.split-row .val { font-weight: 700; min-width: 72px; text-align: right; }
.split-row .money { width: 130px; flex: none; }
.sign-btn { width: 40px; min-height: 44px; border: 1px solid var(--border); background: var(--surface); border-radius: 10px; cursor: pointer; flex: none; }
.sum-line { display: flex; justify-content: space-between; margin-top: 10px; padding-top: 10px; border-top: 2px solid var(--border); font-weight: 700; }

/* ---------- 結算 ---------- */
.check-line { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin-bottom: 12px; }
.fam-card { border: 1px solid var(--border); border-radius: var(--radius); padding: 12px 14px; margin-bottom: 10px; background: var(--surface); }
.fam-card .head { display: flex; align-items: baseline; gap: 8px; margin-bottom: 6px; }
.fam-card .head strong { font-size: 16px; }
.fam-card .head .net { margin-left: auto; font-weight: 800; font-size: 18px; }
.fam-card dl { display: grid; grid-template-columns: repeat(auto-fit, minmax(96px, 1fr)); gap: 4px 12px; margin: 0; }
.fam-card dt { font-size: 12px; color: var(--muted); }
.fam-card dd { margin: 0; font-weight: 600; }

.table-wrap { overflow-x: auto; margin: 0 -16px; padding: 0 16px; }
table.detail { width: 100%; border-collapse: collapse; font-size: 14px; min-width: 560px; }
table.detail th, table.detail td { padding: 8px 6px; text-align: right; border-bottom: 1px solid var(--border); white-space: nowrap; }
table.detail th:first-child, table.detail td:first-child { text-align: left; }
table.detail thead th { color: var(--muted); font-weight: 600; font-size: 12px; }
table.detail tfoot td { font-weight: 800; border-bottom: 0; }

.transfer { display: flex; align-items: center; gap: 10px; padding: 10px 0; border-top: 1px solid var(--border); }
.transfer:first-child { border-top: 0; }
.transfer .idx { width: 26px; height: 26px; border-radius: 50%; background: var(--accent-soft); color: var(--pos); font-weight: 800; display: grid; place-items: center; font-size: 13px; flex: none; }
.transfer .who { flex: 1; min-width: 0; }
.transfer .arrow { color: var(--muted); margin: 0 4px; }
.transfer .amt { font-weight: 800; font-size: 17px; }

.view-toggle { margin-bottom: 12px; }
#report-text { min-height: 220px; font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Noto Sans TC", monospace; font-size: 13px; line-height: 1.55; }
.check { display: flex; align-items: center; gap: 8px; font-size: 14px; margin: 8px 0; cursor: pointer; }
.check input { width: 18px; height: 18px; accent-color: var(--accent); }

.toast {
  position: fixed; left: 50%; bottom: calc(90px + env(safe-area-inset-bottom)); transform: translateX(-50%) translateY(20px);
  background: var(--text); color: var(--bg); padding: 10px 16px; border-radius: 999px; font-size: 14px;
  opacity: 0; pointer-events: none; transition: opacity .2s, transform .2s; z-index: 100; max-width: calc(100% - 32px);
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

@media (max-width: 420px) {
  .brand small { display: none; }
  .split-row .money { width: 110px; }
}

/* 金額欄的運算鍵列（手機數字鍵盤沒有運算符號） */
.calc-bar {
  display: grid; grid-template-columns: repeat(7, 1fr); gap: 6px;
  margin: 0 0 10px; padding: 6px; background: var(--surface-2); border-radius: 10px;
}
.calc-bar button {
  min-height: 40px; border: 1px solid var(--border); background: var(--surface); border-radius: 8px;
  font-size: 18px; font-weight: 700; cursor: pointer; touch-action: manipulation; user-select: none; -webkit-user-select: none;
}
.calc-bar button:active { background: var(--accent-soft); }
.calc-bar button[data-calc="="] { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.split-list .calc-bar { margin-top: 2px; }