@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+TC:wght@400;500;700;900&display=swap');

:root {
  --brand-green: #4E5851;
  --brand-green-dark: #3B4A45;
  --brand-orange: #FF7800;
  --bg-page: #FAFBFC;
  --bg-card: #FFFFFF;
  --text-main: #1F2A28;
  --text-sub: #6B7A76;
  --border-line: #E5E8E7;
  --danger: #D9534F;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: 'Noto Sans TC', sans-serif;
  background: var(--bg-page);
  color: var(--text-main);
  -webkit-tap-highlight-color: transparent;
}

#app {
  max-width: 480px;
  margin: 0 auto;
  min-height: 100vh;
  padding: 0 20px 100px;
}

.view[hidden] { display: none; }

.topbar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 24px 0 16px;
}

.topbar h1 {
  font-size: 26px;
  font-weight: 900;
  margin: 0;
}

.btn-icon {
  border: none;
  background: transparent;
  font-size: 20px;
  color: var(--brand-green);
  padding: 6px 10px;
  cursor: pointer;
}

.btn-icon.btn-danger {
  margin-left: auto;
  color: var(--danger);
  font-size: 15px;
}

.bill-name-input {
  flex: 1;
  border: none;
  background: transparent;
  font-size: 19px;
  font-weight: 700;
  color: var(--text-main);
  padding: 6px 4px;
}
.bill-name-input:focus { outline: none; border-bottom: 1px solid var(--border-line); }

.bill-list { display: flex; flex-direction: column; gap: 12px; }

.bill-card {
  background: var(--bg-card);
  border: 1px solid var(--border-line);
  border-radius: 16px;
  padding: 16px 18px;
  cursor: pointer;
}

.bill-card .bill-card-name {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 6px;
}

.bill-card .bill-card-status {
  font-size: 14px;
  color: var(--text-sub);
}

.bill-card .bill-card-status.all-done { color: var(--brand-green); }

.empty-hint {
  text-align: center;
  color: var(--text-sub);
  font-size: 15px;
  padding: 60px 20px;
}

.section { margin-top: 28px; }

.section-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-sub);
  margin-bottom: 10px;
}

.participant-list { display: flex; flex-direction: column; gap: 10px; }

.participant-row {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--bg-card);
  border: 1px solid var(--border-line);
  border-radius: 12px;
  padding: 10px 12px;
}

.participant-row input[type="text"] {
  flex: 1;
  border: none;
  font-size: 16px;
  font-family: inherit;
  color: var(--text-main);
  min-width: 0;
}
.participant-row input[type="text"]:focus { outline: none; }

.participant-row .paid-input-wrap {
  display: flex;
  align-items: center;
  gap: 4px;
  color: var(--text-sub);
  font-size: 15px;
}

.participant-row input[type="number"] {
  width: 80px;
  border: none;
  font-size: 16px;
  font-family: inherit;
  text-align: right;
  color: var(--text-main);
}
.participant-row input[type="number"]:focus { outline: none; }

.participant-row .btn-remove {
  border: none;
  background: transparent;
  color: var(--text-sub);
  font-size: 18px;
  cursor: pointer;
  padding: 0 2px;
}

.section-summary {
  font-size: 14px;
  color: var(--text-sub);
  margin-bottom: 14px;
  line-height: 1.6;
}

.settlement-list { display: flex; flex-direction: column; gap: 10px; }

.settlement-row {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--bg-card);
  border: 1px solid var(--border-line);
  border-radius: 12px;
  padding: 12px 14px;
}

.settlement-row.received { opacity: 0.5; }

.settlement-row .settlement-text {
  flex: 1;
  font-size: 15px;
}

.settlement-row .settlement-text b { color: var(--brand-orange); }

.settlement-row label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--text-sub);
  white-space: nowrap;
}

.settlement-row input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--brand-green);
}

.btn-primary {
  display: block;
  width: 100%;
  background: var(--brand-orange);
  color: #fff;
  border: none;
  border-radius: 20px;
  font-size: 16px;
  font-weight: 700;
  font-family: inherit;
  padding: 14px 20px;
  cursor: pointer;
}

.btn-secondary {
  display: block;
  width: 100%;
  background: transparent;
  color: var(--brand-green);
  border: 1px solid var(--brand-green);
  border-radius: 20px;
  font-size: 15px;
  font-weight: 500;
  font-family: inherit;
  padding: 11px 20px;
  cursor: pointer;
}

.btn-fab {
  position: fixed;
  left: 50%;
  bottom: 24px;
  transform: translateX(-50%);
  width: calc(100% - 40px);
  max-width: 440px;
  box-shadow: 0 4px 16px rgba(31,42,40,0.16);
}

/* ---------- 逐項輸入：人數選擇 ---------- */
.count-picker {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}

.count-picker .count-label {
  font-size: 15px;
  color: var(--text-main);
}

.count-picker input[type="number"] {
  width: 70px;
  border: 1px solid var(--border-line);
  border-radius: 10px;
  font-size: 16px;
  font-family: inherit;
  text-align: center;
  color: var(--text-main);
  padding: 8px 6px;
}
.count-picker input[type="number"]:focus { outline: none; border-color: var(--brand-green); }

#participant-count-wrap[hidden] { display: none; }
#btn-add-participant[hidden] { display: none; }

/* ---------- 誰付了錢 ---------- */
.payer-list { display: flex; flex-direction: column; gap: 10px; }

.payer-row {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--bg-card);
  border: 1px solid var(--border-line);
  border-radius: 12px;
  padding: 10px 12px;
}

.payer-row label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 15px;
  color: var(--text-main);
}

.payer-row input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--brand-green);
}

.payer-row input[type="number"] {
  margin-left: auto;
  width: 80px;
  border: none;
  font-size: 16px;
  font-family: inherit;
  text-align: right;
  color: var(--text-main);
}
.payer-row input[type="number"]:focus { outline: none; }

.payer-hint {
  font-size: 14px;
  color: var(--text-sub);
}

/* ---------- 均分項目 ---------- */
.shared-item-list { display: flex; flex-direction: column; gap: 10px; }

.shared-item-card {
  background: var(--bg-card);
  border: 1px solid var(--border-line);
  border-radius: 12px;
  padding: 10px 12px;
}

.shared-item-card .shared-item-head {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}

.shared-item-card .shared-item-head input[type="text"] {
  flex: 1;
  border: none;
  font-size: 16px;
  font-family: inherit;
  color: var(--text-main);
  min-width: 0;
}
.shared-item-card .shared-item-head input[type="text"]:focus { outline: none; }

.shared-item-card .shared-item-head input[type="number"] {
  width: 80px;
  border: none;
  font-size: 16px;
  font-family: inherit;
  text-align: right;
  color: var(--text-main);
}
.shared-item-card .shared-item-head input[type="number"]:focus { outline: none; }

.shared-item-checks {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 14px;
}

.shared-item-checks label {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 13px;
  color: var(--text-sub);
}

.shared-item-checks input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: var(--brand-green);
}

/* ---------- 新增帳目：選擇模式 modal ---------- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(31,42,40,0.45);
  display: flex;
  align-items: flex-end;
  justify-content: center;
  z-index: 10;
}

.modal-overlay[hidden] { display: none; }

.modal-box {
  width: 100%;
  max-width: 440px;
  background: var(--bg-card);
  border-radius: 20px 20px 0 0;
  padding: 24px 20px calc(20px + env(safe-area-inset-bottom));
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.modal-title {
  font-size: 17px;
  font-weight: 700;
  text-align: center;
  margin-bottom: 4px;
}

.modal-choice {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 14px 20px;
}

.modal-choice-sub {
  font-size: 12px;
  font-weight: 400;
  opacity: 0.85;
}

.modal-cancel {
  text-align: center;
  color: var(--text-sub);
  margin-top: 4px;
}