/* ChopIt — 帳簿風格
 * 冷白紙面、藏青墨色文字與按鈕；朱紅只用在格線、「清」印章與應付金額（赤字）。
 * 標題與金額用宋體（明體），介面文字用黑體。
 * 深色模式：data-theme="dark"，或 data-theme="system" 且系統為深色。
 */

/* ===== 色彩與字型 ===== */
:root {
  color-scheme: light;
  --paper: #f2f4f3;
  --sheet: #fbfcfb;
  --sheet-sunk: #eef1ef;
  --ink: #1d2b3a;
  --ink-soft: #5b6877;
  --ink-faint: #8a96a1;
  --rule: #d6ddda;
  --rule-strong: #b8c2be;
  --cinnabar: #b5402a;
  --cinnabar-line: rgba(181, 64, 42, 0.42);
  --cinnabar-wash: #f7e7e2;
  --amber: #9a5c00;
  --amber-wash: #fbf0dc;
  --on-ink: #f6f8f7;
  --focus: rgba(29, 43, 58, 0.35);
  --series-1: #2a78d6;
  --series-2: #eb6834;
  --shadow: 0 1px 0 rgba(29, 43, 58, 0.06), 0 10px 28px -18px rgba(29, 43, 58, 0.35);

  --font-sans: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", system-ui, sans-serif;
  --font-serif: "Noto Serif TC", "Songti TC", "PMingLiU", "Noto Serif CJK TC", serif;

  --step--1: 0.8125rem;
  --step-0: 1rem;
  --step-1: 1.125rem;
  --step-2: 1.25rem;
  --step-3: 1.625rem;
  --step-4: 2.125rem;
  --radius-control: 6px;
  --radius-sheet: 3px;
}

html:lang(ja) {
  --font-sans: "Noto Sans JP", "Hiragino Sans", "Yu Gothic", "Meiryo", system-ui, sans-serif;
  --font-serif: "Noto Serif JP", "Hiragino Mincho ProN", "Yu Mincho", serif;
}

html:lang(en) {
  --font-sans: "Noto Sans", "Noto Sans TC", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-serif: "Noto Serif", "Noto Serif TC", Georgia, serif;
}

/* 深色：夜間的帳簿，紙面是深藏青，不用純黑 */
:root[data-theme="dark"] {
  color-scheme: dark;
  --paper: #0f151c;
  --sheet: #161f29;
  --sheet-sunk: #121a23;
  --ink: #e4e9e6;
  --ink-soft: #99a6b2;
  --ink-faint: #6f7d8a;
  --rule: #2a3541;
  --rule-strong: #3a4756;
  --cinnabar: #e07560;
  --cinnabar-line: rgba(224, 117, 96, 0.45);
  --cinnabar-wash: #3a1f1a;
  --amber: #e2a845;
  --amber-wash: #33270f;
  --on-ink: #10161d;
  --focus: rgba(228, 233, 230, 0.4);
  --series-1: #3987e5;
  --series-2: #d95926;
  --shadow: 0 1px 0 rgba(0, 0, 0, 0.3), 0 12px 30px -20px rgba(0, 0, 0, 0.8);
}

@media (prefers-color-scheme: dark) {
  :root[data-theme="system"] {
    color-scheme: dark;
    --paper: #0f151c;
    --sheet: #161f29;
    --sheet-sunk: #121a23;
    --ink: #e4e9e6;
    --ink-soft: #99a6b2;
    --ink-faint: #6f7d8a;
    --rule: #2a3541;
    --rule-strong: #3a4756;
    --cinnabar: #e07560;
    --cinnabar-line: rgba(224, 117, 96, 0.45);
    --cinnabar-wash: #3a1f1a;
    --amber: #e2a845;
    --amber-wash: #33270f;
    --on-ink: #10161d;
    --focus: rgba(228, 233, 230, 0.4);
    --series-1: #3987e5;
    --series-2: #d95926;
    --shadow: 0 1px 0 rgba(0, 0, 0, 0.3), 0 12px 30px -20px rgba(0, 0, 0, 0.8);
  }
}

/* ===== 基礎 ===== */
*,
*::before,
*::after {
  box-sizing: border-box;
}

* {
  margin: 0;
  padding: 0;
}

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

body {
  min-height: 100vh;
  /* 中日文換行規則：句讀與小字假名不放在行首 */
  line-break: strict;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: var(--step-0);
  line-height: 1.65;
  font-feature-settings: "palt" 0;
}

h1,
h2,
h3 {
  font-family: var(--font-serif);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: 0.01em;
}

h1 {
  font-size: var(--step-4);
}

h2 {
  margin: 0 0 12px;
  font-size: var(--step-2);
}

h3 {
  margin: 20px 0 8px;
  font-size: var(--step-1);
}

a {
  color: var(--ink);
  text-decoration-color: var(--rule-strong);
  text-underline-offset: 3px;
}

a:hover {
  text-decoration-color: currentColor;
}

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

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

ul,
ol {
  list-style: none;
}

img {
  max-width: 100%;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.muted,
.field-hint,
.rate-hint {
  color: var(--ink-soft);
  font-size: var(--step--1);
}

.field-hint,
.rate-hint {
  margin-top: 4px;
  line-height: 1.55;
}

.empty-state {
  padding: 20px 0;
  color: var(--ink-soft);
}

/* 數字對齊 */
.num,
.transaction-amount,
.settlement-amount,
.payment-amount,
.hbar-value,
.budget-head span,
.sheet-amount {
  font-variant-numeric: tabular-nums;
}

/* ===== 頁首 ===== */
.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--rule);
}

.topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  max-width: 760px;
  min-height: 52px;
  margin: 0 auto;
  padding: 6px 16px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
}

.brand-seal {
  display: inline-grid;
  place-items: center;
  width: 26px;
  height: 26px;
  border: 1.5px solid var(--cinnabar);
  border-radius: 4px;
  color: var(--cinnabar);
  font-family: var(--font-serif);
  font-size: 15px;
  font-weight: 700;
  line-height: 1;
}

.brand-name {
  font-family: var(--font-serif);
  font-size: var(--step-1);
  font-weight: 700;
  letter-spacing: 0.02em;
}

.topbar-back {
  color: var(--ink-soft);
  font-size: var(--step--1);
  text-decoration: none;
}

.topbar-back:hover {
  color: var(--ink);
}

.prefs-menu {
  position: relative;
}

.prefs-menu summary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 36px;
  padding: 4px 10px;
  border: 1px solid var(--rule);
  border-radius: 999px;
  color: var(--ink-soft);
  cursor: pointer;
  font-size: var(--step--1);
  list-style: none;
}

.prefs-menu summary::-webkit-details-marker {
  display: none;
}

/* 半月形圖示：表示深淺色設定 */
.prefs-icon {
  width: 14px;
  height: 14px;
  border: 1.5px solid currentColor;
  border-radius: 50%;
  background: linear-gradient(90deg, currentColor 50%, transparent 50%);
}

.prefs-panel {
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  min-width: 190px;
  padding: 12px;
  border: 1px solid var(--rule);
  border-radius: var(--radius-control);
  background: var(--sheet);
  box-shadow: var(--shadow);
}

.prefs-heading {
  margin: 4px 0 2px;
  color: var(--ink-faint);
  font-size: 12px;
}

.prefs-options a {
  display: block;
  padding: 6px 8px;
  border-radius: 4px;
  text-decoration: none;
}

.prefs-options a:hover {
  background: var(--sheet-sunk);
}

.prefs-options a[aria-current="true"] {
  font-weight: 700;
}

.prefs-options a[aria-current="true"]::after {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  margin-left: 8px;
  border-radius: 50%;
  background: var(--cinnabar);
  vertical-align: middle;
}

.prefs-account {
  display: grid;
  gap: 2px;
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px solid var(--rule);
}

.prefs-account a,
.prefs-account .link-button {
  padding: 6px 8px;
  text-align: left;
}

/* ===== 版面 ===== */
.page {
  max-width: 760px;
  margin: 0 auto;
  padding: 20px 16px 96px;
}

.page-narrow {
  max-width: 520px;
}

.page-head {
  margin: 8px 0 18px;
}

.page-head h1 {
  overflow-wrap: anywhere;
}

.page-head p {
  margin-top: 4px;
  color: var(--ink-soft);
}

.status-line {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 10px;
  margin-top: 6px;
  color: var(--ink-soft);
  font-size: var(--step--1);
}

/* 紙張：帳本頁的主要容器 */
.sheet,
.container {
  margin-bottom: 18px;
  padding: 20px;
  border: 1px solid var(--rule);
  border-radius: var(--radius-sheet);
  background: var(--sheet);
  box-shadow: var(--shadow);
}

.section-heading {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 4px 12px;
  margin-bottom: 12px;
}

.section-heading h2 {
  margin: 0;
}

.section-heading p,
.section-heading .text-link {
  color: var(--ink-soft);
  font-size: var(--step--1);
}

.text-link {
  color: var(--ink);
  font-size: var(--step--1);
}

/* ===== 按鈕與表單 ===== */
button,
.button-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-height: 42px;
  padding: 9px 18px;
  border: 1px solid var(--ink);
  border-radius: var(--radius-control);
  background: var(--ink);
  color: var(--on-ink);
  cursor: pointer;
  font-weight: 500;
  line-height: 1.3;
  text-decoration: none;
  transition: background-color 0.15s ease, border-color 0.15s ease;
}

button:hover,
.button-link:hover {
  background: color-mix(in srgb, var(--ink) 86%, var(--paper));
}

button:disabled {
  border-color: var(--rule-strong);
  background: var(--rule);
  color: var(--ink-faint);
  cursor: not-allowed;
}

button.secondary,
.button-link {
  border-color: var(--rule-strong);
  background: transparent;
  color: var(--ink);
}

button.secondary:hover,
.button-link:hover {
  border-color: var(--ink-soft);
  background: var(--sheet-sunk);
}

button.small,
.button-link.small {
  min-height: 32px;
  padding: 4px 12px;
  font-size: var(--step--1);
}

button.danger {
  border-color: var(--cinnabar);
  background: transparent;
  color: var(--cinnabar);
}

button.danger:hover {
  background: var(--cinnabar-wash);
}

.link-button {
  min-height: 0;
  padding: 0;
  border: 0;
  background: none;
  color: var(--ink);
  font-weight: 400;
  text-decoration: underline;
  text-decoration-color: var(--rule-strong);
  text-underline-offset: 3px;
}

.link-button:hover {
  background: none;
  text-decoration-color: currentColor;
}

input,
select,
textarea {
  width: 100%;
  min-height: 42px;
  padding: 8px 10px;
  border: 1px solid var(--rule-strong);
  border-radius: var(--radius-control);
  background: var(--sheet);
}

input:focus,
select:focus,
textarea:focus {
  border-color: var(--ink-soft);
  outline: 3px solid var(--focus);
  outline-offset: 0;
}

input[type="checkbox"],
input[type="radio"] {
  width: auto;
  min-height: 0;
  accent-color: var(--ink);
}

label,
legend {
  display: block;
  margin-bottom: 4px;
  color: var(--ink-soft);
  font-size: var(--step--1);
  font-weight: 500;
}

fieldset {
  border: 0;
}

.form-group {
  margin-bottom: 14px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0 12px;
}

.inline-form {
  display: flex;
  gap: 8px;
}

.inline-form input,
.inline-form select {
  flex: 1;
  min-width: 0;
}

.inline-form button {
  flex: none;
}

.radio-line {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 4px 0;
  color: var(--ink);
  font-size: var(--step-0);
  font-weight: 400;
}

.card-actions,
.member-actions,
.confirm-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.card-actions {
  margin-top: 10px;
}

.error-box {
  margin-bottom: 14px;
  padding: 10px 12px;
  border-left: 3px solid var(--cinnabar);
  background: var(--cinnabar-wash);
  color: var(--ink);
}

.error-box p + p {
  margin-top: 4px;
}

.disabled-msg {
  margin-bottom: 14px;
  padding: 10px 12px;
  border-left: 3px solid var(--amber);
  background: var(--amber-wash);
  color: var(--ink);
}

/* 分攤方式切換 */
.segmented {
  display: inline-flex;
  padding: 3px;
  border: 1px solid var(--rule-strong);
  border-radius: var(--radius-control);
  background: var(--sheet-sunk);
}

.segmented-option {
  position: relative;
  margin: 0;
  color: var(--ink);
}

.segmented-option input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
}

.segmented-option span {
  display: block;
  padding: 6px 14px;
  border-radius: 4px;
  cursor: pointer;
  font-size: var(--step--1);
}

.segmented-option input:checked + span {
  background: var(--sheet);
  box-shadow: 0 0 0 1px var(--rule-strong);
  font-weight: 700;
}

.segmented-option input:focus-visible + span {
  outline: 3px solid var(--focus);
}

.splitter-list {
  border-top: 1px solid var(--rule);
}

.splitter-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 6px 0;
  border-bottom: 1px solid var(--rule);
}

.splitter-name {
  display: flex;
  flex: 1;
  align-items: center;
  gap: 10px;
  margin: 0;
  color: var(--ink);
  font-size: var(--step-0);
  font-weight: 400;
  cursor: pointer;
}

.splitter-row .weight-input,
.splitter-row .share-input {
  display: none;
  width: 110px;
  min-height: 36px;
  text-align: right;
}

.split-mode-weight .splitter-row .weight-input,
.split-mode-amount .splitter-row .share-input {
  display: block;
}

.share-summary.mismatch {
  color: var(--cinnabar);
  font-weight: 700;
}

.transaction-form > button[type="submit"] {
  width: 100%;
  margin-top: 6px;
}

/* ===== 頁籤：帳簿的索引籤 ===== */
.tab-header {
  display: flex;
  margin: 0 0 16px;
  overflow-x: auto;
  border-bottom: 1px solid var(--rule);
  scrollbar-width: none;
}

.tab-header::-webkit-scrollbar {
  display: none;
}

.tab-header button {
  flex: none;
  min-height: 44px;
  padding: 10px 14px;
  border: 0;
  border-bottom: 2px solid transparent;
  border-radius: 0;
  background: transparent;
  color: var(--ink-soft);
  font-weight: 500;
  white-space: nowrap;
}

.tab-header button:hover {
  background: transparent;
  color: var(--ink);
}

.tab-header button.active {
  border-bottom-color: var(--cinnabar);
  color: var(--ink);
  font-weight: 700;
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

.tab-content > h2 {
  margin-bottom: 14px;
}

/* ===== 帳頁：帳本頁的主角 ===== */
.ledger-title {
  margin: 4px 0 2px;
  font-size: var(--step-4);
  overflow-wrap: anywhere;
}

.ledger-sheet {
  position: relative;
  padding: 0;
  overflow: hidden;
}

.ledger-sheet-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 4px 12px;
  padding: 16px 20px 10px;
}

.ledger-sheet-head h2 {
  margin: 0;
}

.balance-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-serif);
}

.balance-table th {
  padding: 6px 12px;
  border-top: 2px solid var(--cinnabar-line);
  border-bottom: 1px solid var(--cinnabar-line);
  color: var(--cinnabar);
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 500;
  text-align: left;
}

.balance-table td {
  height: 52px;
  padding: 6px 12px;
  border-bottom: 1px solid var(--rule);
  vertical-align: middle;
}

.balance-table tr:last-child td {
  border-bottom: 2px solid var(--cinnabar-line);
}

/* 帳簿的朱紅直線：成員欄與金額欄之間是雙線 */
.balance-table th + th,
.balance-table td + td {
  border-left: 1px solid var(--cinnabar-line);
}

.balance-table th:nth-child(2),
.balance-table td:nth-child(2) {
  box-shadow: inset 3px 0 0 -2px var(--cinnabar-line);
}

.balance-table th:first-child,
.balance-table td:first-child {
  padding-left: 20px;
}

.balance-table th:last-child,
.balance-table td:last-child {
  padding-right: 20px;
}

.sheet-name {
  font-family: var(--font-sans);
  font-weight: 500;
  word-break: keep-all;
  overflow-wrap: break-word;
}

.sheet-unit {
  color: var(--ink-faint);
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 400;
}

.sheet-name small {
  margin-left: 4px;
}

.sheet-amount {
  width: 34%;
  font-size: var(--step-2);
  font-weight: 700;
  text-align: right;
  white-space: nowrap;
}

.balance-table th.sheet-amount {
  font-size: 12px;
  text-align: right;
}

.sheet-amount.owed {
  color: var(--cinnabar);
}

.sheet-currency {
  margin-left: 4px;
  color: var(--ink-faint);
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 400;
}

.balance-table tr.is-me .sheet-name {
  font-weight: 700;
}

.sheet-foot {
  padding: 10px 20px 14px;
  color: var(--ink-soft);
  font-size: var(--step--1);
}

.sheet-foot p + p {
  margin-top: 2px;
}

/* 「清」印章：已結清的成員。唯一一個醒目的裝飾 */
.seal {
  display: inline-grid;
  place-items: center;
  width: 46px;
  height: 46px;
  margin: -6px 0;
  border: 2.5px solid var(--cinnabar);
  border-radius: 50%;
  color: var(--cinnabar);
  font-family: var(--font-serif);
  font-size: 23px;
  font-weight: 700;
  line-height: 1;
  transform: rotate(-12deg);
  box-shadow: inset 0 0 0 2px var(--sheet), inset 0 0 0 3px var(--cinnabar-line);
}

/* 印章蓋在應收與應付兩欄的正中間 */
.seal-cell {
  text-align: center;
}

@media (prefers-reduced-motion: no-preference) {
  .seal {
    animation: seal-press 0.5s cubic-bezier(0.2, 0.9, 0.3, 1.2) both;
    animation-delay: calc(var(--seal-index, 0) * 90ms + 200ms);
  }

  @keyframes seal-press {
    0% {
      opacity: 0;
      transform: rotate(-12deg) scale(1.8);
    }
    60% {
      opacity: 1;
      transform: rotate(-12deg) scale(0.92);
    }
    100% {
      opacity: 1;
      transform: rotate(-12deg) scale(1);
    }
  }
}

.all-settled {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 18px 20px;
  border-top: 2px solid var(--cinnabar-line);
  border-bottom: 2px solid var(--cinnabar-line);
}

/* ===== 標籤 ===== */
.badge {
  display: inline-block;
  padding: 0 7px;
  border: 1px solid var(--rule-strong);
  border-radius: 999px;
  color: var(--ink-soft);
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 500;
  line-height: 1.6;
  vertical-align: middle;
  white-space: nowrap;
}

.badge-owner,
.badge-admin {
  border-color: var(--ink-soft);
  color: var(--ink);
}

.badge-repayment {
  border-color: var(--cinnabar-line);
  color: var(--cinnabar);
}

.badge-waiting {
  border-color: var(--amber);
  color: var(--amber);
}

/* ===== 交易紀錄：帳簿上的一行，不是卡片 ===== */
.filter-form {
  margin-bottom: 10px;
  padding: 12px 14px 4px;
  border: 1px solid var(--rule);
  border-radius: var(--radius-control);
  background: var(--sheet-sunk);
}

.filter-actions {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 10px;
}

.result-count {
  margin: 4px 0 6px;
  color: var(--ink-soft);
  font-size: var(--step--1);
}

.transaction-card {
  padding: 14px 0;
  border-bottom: 1px solid var(--rule);
}

.transaction-card:first-of-type {
  border-top: 1px solid var(--rule);
}

.transaction-card-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.transaction-card-header strong {
  font-size: var(--step-1);
  font-weight: 700;
  overflow-wrap: anywhere;
}

.transaction-amount {
  flex: none;
  font-family: var(--font-serif);
  font-size: var(--step-1);
  font-weight: 700;
  white-space: nowrap;
}

.transaction-card p {
  margin-top: 2px;
  color: var(--ink-soft);
  font-size: var(--step--1);
}

.transaction-card p strong {
  color: var(--ink);
  font-weight: 500;
}

.transaction-card.has-dispute {
  padding-left: 12px;
  border-left: 3px solid var(--amber);
}

.transaction-card.is-paused {
  opacity: 0.6;
}

.confirm-box {
  margin-top: 8px;
}

.confirm-status {
  color: var(--ink-soft);
}

.confirm-status.is-complete {
  color: var(--ink);
  font-weight: 500;
}

.dispute-note {
  color: var(--amber) !important;
  overflow-wrap: anywhere;
}

.confirm-actions {
  margin-top: 8px;
}

.dispute-form summary {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  padding: 4px 12px;
  border: 1px solid var(--amber);
  border-radius: var(--radius-control);
  color: var(--amber);
  cursor: pointer;
  font-size: var(--step--1);
  list-style: none;
}

.dispute-form summary::-webkit-details-marker {
  display: none;
}

.dispute-form[open] {
  flex-basis: 100%;
}

.dispute-form form {
  display: flex;
  gap: 8px;
  margin-top: 8px;
}

.dispute-form input {
  flex: 1;
  min-width: 0;
}

.records-footer,
.link-footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px 18px;
  margin-top: 14px;
  font-size: var(--step--1);
}

.muted-link {
  color: var(--ink-soft);
}

/* ===== 成員 ===== */
.member-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 10px 0;
  border-bottom: 1px solid var(--rule);
}

.member-row.is-left {
  color: var(--ink-soft);
}

.member-name {
  overflow-wrap: anywhere;
}

.invite-link-box {
  margin-bottom: 16px;
  padding: 14px;
  border: 1px dashed var(--rule-strong);
  border-radius: var(--radius-control);
  background: var(--sheet-sunk);
}

.invite-link-box input {
  margin: 8px 0 4px;
  font-size: var(--step--1);
}

.line-share {
  border-color: #06c755;
  color: #06a347;
}

:root[data-theme="dark"] .line-share {
  color: #3ddc84;
}

/* ===== 帳本管理：設定列 ===== */
.list-item {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 16px;
  padding: 14px 0;
  border-bottom: 1px solid var(--rule);
}

.list-item > p {
  flex: 1 1 260px;
  color: var(--ink-soft);
  font-size: var(--step--1);
}

.list-item form {
  display: flex;
  flex: 1 1 100%;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 16px;
}

.list-item form > p {
  flex: 1 1 260px;
  color: var(--ink-soft);
  font-size: var(--step--1);
}

.danger-zone {
  margin-top: 8px;
}

/* 首頁的帳本清單 */
.ledger-list li {
  border-bottom: 1px solid var(--rule);
}

.ledger-list li:first-child {
  border-top: 1px solid var(--rule);
}

.ledger-link {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 2px;
  text-decoration: none;
}

.ledger-link:hover .ledger-link-name {
  text-decoration: underline;
  text-decoration-color: var(--cinnabar-line);
  text-underline-offset: 4px;
}

.ledger-link-name {
  font-family: var(--font-serif);
  font-size: var(--step-1);
  font-weight: 700;
  overflow-wrap: anywhere;
}

.ledger-link-meta {
  flex: none;
  color: var(--ink-soft);
  font-size: var(--step--1);
}

.trash-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 12px 0;
  border-bottom: 1px solid var(--rule);
}

.trash-row small {
  display: block;
}

/* ===== 手機的「記一筆」 ===== */
.add-fab {
  display: none;
}

@media (max-width: 640px) {
  .add-fab {
    position: fixed;
    right: 16px;
    bottom: calc(16px + env(safe-area-inset-bottom));
    left: 16px;
    z-index: 15;
    display: flex;
    min-height: 50px;
    box-shadow: 0 12px 24px -12px rgba(15, 21, 28, 0.6);
    font-size: var(--step-1);
  }
}

/* ===== 結算 ===== */
.settlement-section {
  margin-bottom: 18px;
  padding: 20px;
  border: 1px solid var(--rule);
  border-radius: var(--radius-sheet);
  background: var(--sheet);
  box-shadow: var(--shadow);
}

.summary-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 0;
  border-top: 2px solid var(--cinnabar-line);
  border-bottom: 2px solid var(--cinnabar-line);
}

.summary-card {
  display: grid;
  gap: 2px;
  padding: 12px 14px;
}

.summary-card + .summary-card {
  border-left: 1px solid var(--cinnabar-line);
}

.summary-card span,
.summary-card small {
  color: var(--ink-soft);
  font-size: var(--step--1);
}

.summary-card strong {
  font-family: var(--font-serif);
  font-size: var(--step-3);
  font-variant-numeric: tabular-nums;
  line-height: 1.2;
  overflow-wrap: anywhere;
}

.settlement-currency-control {
  margin-bottom: 12px;
}

.exchange-rate-row {
  display: grid;
  grid-template-columns: 1fr 150px;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
}

.exchange-rate-row label {
  margin: 0;
  color: var(--ink);
  font-size: var(--step-0);
}

.exchange-rate-container form > button {
  margin-top: 6px;
}

.rate-status {
  margin-bottom: 6px;
  color: var(--ink-soft);
  font-size: var(--step--1);
}

.rate-status.stale {
  color: var(--amber);
}

.lock-form {
  margin-top: 12px;
}

.settlement-list li {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto;
  align-items: center;
  gap: 8px 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--rule);
}

.settlement-list li:first-child {
  border-top: 1px solid var(--rule);
}

.settlement-person small {
  display: block;
  color: var(--ink-faint);
  font-size: 12px;
}

.settlement-person strong {
  overflow-wrap: anywhere;
}

.settlement-arrow {
  color: var(--cinnabar);
  font-family: var(--font-serif);
}

.settlement-amount {
  font-family: var(--font-serif);
  font-size: var(--step-2);
  font-weight: 700;
  text-align: right;
  white-space: nowrap;
}

.repay-form {
  display: flex;
  grid-column: 1 / -1;
  gap: 8px;
}

.repay-form input {
  flex: 1;
  min-width: 0;
}

.settlement-text {
  min-height: 140px;
  padding: 12px;
  font-size: var(--step--1);
  line-height: 1.6;
  resize: vertical;
}

.payment-list li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid var(--rule);
}

.payment-list small {
  display: block;
  color: var(--ink-soft);
  font-size: var(--step--1);
}

.payment-summary {
  flex: none;
  text-align: right;
}

.payment-amount {
  font-family: var(--font-serif);
  font-weight: 700;
  white-space: nowrap;
}

.net-positive {
  color: var(--ink);
}

.net-negative {
  color: var(--cinnabar);
}

.rounding-note {
  color: var(--ink-faint);
}

.member-detail {
  border-bottom: 1px solid var(--rule);
}

.member-detail summary {
  display: flex;
  justify-content: space-between;
  padding: 10px 0;
  cursor: pointer;
}

.member-detail-body {
  padding: 0 0 10px;
}

.detail-list li,
.share-list li {
  padding: 2px 0;
  color: var(--ink-soft);
  font-size: var(--step--1);
}

.transaction-breakdown {
  padding: 12px 0;
  border-bottom: 1px solid var(--rule);
}

.transaction-breakdown-header {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  font-family: var(--font-serif);
}

.transaction-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 2px 14px;
  margin: 2px 0 4px;
  color: var(--ink-soft);
  font-size: var(--step--1);
}

.share-list {
  display: flex;
  flex-wrap: wrap;
  gap: 2px 14px;
}

.snapshot-link {
  font-weight: 700;
  overflow-wrap: anywhere;
}

.snapshot-list small {
  display: block;
}

/* ===== 統計圖表與預算 ===== */
.series-1 {
  background: var(--series-1);
}

.series-2 {
  background: var(--series-2);
}

.hbar-row,
.hbar-line {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 8px;
}

.hbar-row {
  grid-template-columns: 5.5em 1fr auto;
  padding: 5px 0;
}

.hbar-label {
  overflow: hidden;
  font-size: var(--step--1);
  text-overflow: ellipsis;
  white-space: nowrap;
}

.hbar-track {
  display: block;
  min-width: 0;
  height: 16px;
}

/* 資料端 4px 圓角，基準線那端維持直角 */
.hbar-bar {
  display: block;
  height: 100%;
  border-radius: 0 4px 4px 0;
}

.hbar-value {
  font-size: var(--step--1);
  white-space: nowrap;
}

.hbar-value small {
  color: var(--ink-soft);
}

.hbar-group {
  padding: 8px 0;
  border-bottom: 1px solid var(--rule);
}

.hbar-group > .hbar-label {
  display: block;
  margin-bottom: 4px;
  font-weight: 700;
}

.hbar-pair {
  display: grid;
  gap: 2px;
}

.hbar-line .hbar-value {
  min-width: 9.5em;
  text-align: right;
}

.chart-legend {
  display: flex;
  gap: 12px;
}

.legend-swatch {
  display: inline-block;
  width: 10px;
  height: 10px;
  margin-right: 4px;
  border-radius: 2px;
  vertical-align: middle;
}

.column-chart {
  display: flex;
  align-items: flex-end;
  gap: 2px;
  height: 160px;
  border-bottom: 1px solid var(--rule-strong);
}

.column-slot {
  display: flex;
  flex: 1 1 0;
  align-items: flex-end;
  justify-content: center;
  height: 100%;
  min-width: 0;
}

.column-bar {
  display: block;
  width: 100%;
  max-width: 24px;
  min-height: 1px;
  border-radius: 4px 4px 0 0;
}

.column-axis {
  display: flex;
  gap: 2px;
  margin-top: 4px;
  color: var(--ink-soft);
  font-size: 12px;
}

.column-axis span {
  flex: 1 1 0;
  min-width: 0;
  white-space: nowrap;
}

.chart-table summary,
.budget-form summary {
  cursor: pointer;
  font-weight: 700;
}

.chart-table table {
  width: 100%;
  margin-top: 12px;
  border-collapse: collapse;
  font-size: var(--step--1);
}

.chart-table caption {
  padding: 4px 0;
  font-weight: 700;
  text-align: left;
}

.chart-table th,
.chart-table td {
  padding: 4px 6px;
  border-bottom: 1px solid var(--rule);
  text-align: left;
}

.chart-table td:not(:first-child),
.chart-table th:not(:first-child) {
  text-align: right;
}

.budget-form {
  margin-top: 14px;
}

.budget-form form {
  margin-top: 10px;
}

.budget-category-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 10px;
}

.budget-row {
  padding: 8px 0;
}

.budget-head {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 4px 12px;
}

.budget-head span {
  font-size: var(--step--1);
}

.budget-track {
  height: 8px;
  margin: 6px 0 4px;
  overflow: hidden;
  border-radius: 4px;
  background: var(--sheet-sunk);
  box-shadow: inset 0 0 0 1px var(--rule);
}

.budget-fill {
  height: 100%;
  border-radius: 4px;
  background: var(--ink-soft);
}

.budget-warn .budget-fill {
  background: var(--amber);
}

.budget-over .budget-fill {
  background: var(--cinnabar);
}

.budget-status {
  color: var(--ink-soft);
  font-size: var(--step--1);
}

.budget-warn .budget-status {
  color: var(--amber);
}

.budget-over .budget-status {
  color: var(--cinnabar);
  font-weight: 700;
}

/* ===== 收據 ===== */
.receipt-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 12px;
  margin-bottom: 16px;
}

.receipt-item img {
  display: block;
  width: 100%;
  height: 200px;
  border: 1px solid var(--rule);
  border-radius: var(--radius-sheet);
  background: var(--sheet-sunk);
  object-fit: cover;
  object-position: top;
}

.receipt-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 6px;
  margin-top: 6px;
}

.receipt-upload input[type="file"] {
  padding: 8px;
}

.receipt-upload button {
  margin-top: 10px;
}

/* ===== 操作紀錄 ===== */
.activity-item {
  padding: 12px 0;
  border-bottom: 1px solid var(--rule);
}

.activity-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 10px;
}

.activity-meta time {
  color: var(--ink-faint);
  font-size: var(--step--1);
  font-variant-numeric: tabular-nums;
}

.activity-text {
  overflow-wrap: anywhere;
}

.activity-changes {
  margin: 4px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--cinnabar-line);
  color: var(--ink-soft);
  font-size: var(--step--1);
  overflow-wrap: anywhere;
}

.pagination {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 16px;
}

/* ===== 登入頁 ===== */
.login-page main {
  display: grid;
  min-height: calc(100vh - 140px);
  place-items: center;
  padding: 24px 16px;
}

.login-sheet {
  width: 100%;
  max-width: 420px;
  padding: 0;
  overflow: hidden;
}

/* 登入頁的示意帳頁：說明這個網站在做什麼 */
.login-demo {
  padding: 22px 22px 6px;
  border-bottom: 2px solid var(--cinnabar-line);
  background: var(--sheet-sunk);
}

.login-demo .balance-table td {
  height: 44px;
}

.login-body {
  padding: 22px;
}

.login-body h1 {
  font-size: var(--step-3);
}

.login-body p {
  margin-top: 6px;
  color: var(--ink-soft);
}

.login-button {
  width: 100%;
  min-height: 48px;
  margin-top: 18px;
  border-color: #06c755;
  background: #06c755;
  color: #fff;
  font-size: var(--step-1);
  font-weight: 700;
}

.login-button:hover {
  border-color: #05b14c;
  background: #05b14c;
}

.login-legal {
  font-size: var(--step--1);
}

/* ===== 訊息頁與法律頁 ===== */
.message-sheet {
  margin-top: 24px;
  text-align: left;
}

.message-text {
  margin-bottom: 18px;
  font-size: var(--step-1);
  line-height: 1.7;
}

.legal-page h2 {
  margin-top: 28px;
  font-size: var(--step-1);
}

.legal-page p,
.legal-page li {
  max-width: 68ch;
  line-height: 1.8;
}

.legal-page ul {
  margin: 8px 0;
  padding-left: 1.2em;
  list-style: disc;
}

.legal-page ul ul {
  list-style: circle;
}

.legal-page .updated,
.legal-notice {
  color: var(--ink-soft);
  font-size: var(--step--1);
}

.legal-notice {
  margin-bottom: 12px;
  padding: 10px 12px;
  border-left: 3px solid var(--rule-strong);
  background: var(--sheet-sunk);
}

/* ===== 頁尾與廣告 ===== */
.site-footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 6px 20px;
  padding: 24px 16px 40px;
  font-size: var(--step--1);
}

.site-footer a {
  color: var(--ink-soft);
}

.ad-container {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 16px;
}

/* ===== 手機 ===== */
@media (max-width: 560px) {
  h1,
  .ledger-title {
    font-size: var(--step-3);
  }

  .sheet,
  .container,
  .settlement-section {
    padding: 16px;
  }

  .ledger-sheet {
    padding: 0;
  }

  .ledger-sheet-head,
  .sheet-foot {
    padding-right: 16px;
    padding-left: 16px;
  }

  .balance-table th:first-child,
  .balance-table td:first-child {
    padding-left: 16px;
  }

  .balance-table th:last-child,
  .balance-table td:last-child {
    padding-right: 16px;
  }

  .sheet-amount {
    width: 30%;
    font-size: var(--step-1);
  }

  /* 手機上帳頁只顯示數字，幣別在標題旁 */
  .balance-table .sheet-currency {
    display: none;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .settlement-list li {
    grid-template-columns: 1fr auto 1fr;
  }

  .settlement-amount {
    grid-column: 1 / -1;
    text-align: left;
  }

  .summary-card + .summary-card {
    border-top: 1px solid var(--cinnabar-line);
    border-left: 0;
  }

  .splitter-row .weight-input,
  .splitter-row .share-input {
    width: 92px;
  }

  .exchange-rate-row {
    grid-template-columns: 1fr 120px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition: none !important;
  }
}

/* 交易紀錄的搜尋與篩選（預設收合） */
.filter-details {
  margin-bottom: 6px;
}

.filter-details > summary {
  display: inline-block;
  margin-bottom: 8px;
  cursor: pointer;
}

/* 帳頁標題下方被頁首擋住時，讓捲動定位留出空間 */
.tab-content,
.transaction-card {
  scroll-margin-top: 64px;
}

/* ===== 代購 ===== */
/* 建立帳本時選擇類型 */
.type-option {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin: 0 0 8px;
  padding: 10px 12px;
  border: 1px solid var(--rule);
  border-radius: var(--radius-control);
  color: var(--ink);
  font-size: var(--step-0);
  font-weight: 400;
  cursor: pointer;
}

.type-option:has(input:checked) {
  border-color: var(--ink-soft);
  background: var(--sheet-sunk);
}

.type-option input {
  margin-top: 4px;
}

.type-option span {
  display: grid;
  gap: 2px;
  min-width: 0;
}

.type-option small {
  color: var(--ink-soft);
  font-size: var(--step--1);
}

.purchase-summary {
  margin-bottom: 14px;
}

/* 代購清單的篩選 */
.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 8px;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border: 1px solid var(--rule-strong);
  border-radius: 999px;
  color: var(--ink-soft);
  font-size: var(--step--1);
  text-decoration: none;
}

.chip:hover {
  color: var(--ink);
}

.chip[aria-current="true"] {
  border-color: var(--ink);
  background: var(--ink);
  color: var(--sheet);
}

.chip-count {
  font-variant-numeric: tabular-nums;
}

.purchase-qty {
  color: var(--ink-soft);
  font-weight: 400;
}

.purchase-note {
  color: var(--ink-soft);
  overflow-wrap: anywhere;
}

.purchase-facts {
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--rule);
}

.purchase-facts p {
  margin: 2px 0;
}

/* 狀態標籤：只有「買不到」用朱紅，其他保持藏青墨色的深淺 */
.badge-status-claimed {
  border-color: var(--ink-soft);
  color: var(--ink);
}

.badge-status-unavailable {
  border-color: var(--cinnabar-line);
  color: var(--cinnabar);
}

.badge-status-purchased {
  border-color: var(--ink-soft);
  background: var(--sheet-sunk);
  color: var(--ink);
}

.badge-status-delivered {
  border-color: var(--ink);
  background: var(--ink);
  color: var(--sheet);
}

.purchase-card.status-cancelled .transaction-card-header strong {
  color: var(--ink-faint);
  text-decoration: line-through;
}

/* 代購：參考照片縮圖、清單上方的工具列、分攤運費 */
.purchase-photo-link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 6px 0;
  text-decoration: none;
}

.purchase-thumb {
  width: 56px;
  height: 56px;
  border: 1px solid var(--rule);
  border-radius: var(--radius-control);
  object-fit: cover;
}

.purchase-tools {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  gap: 8px 16px;
  margin-bottom: 12px;
}

.purchase-tools .share-details {
  flex: 1 1 100%;
}

.share-details > summary {
  display: inline-block;
  margin-bottom: 8px;
  cursor: pointer;
}

.buyer-switch {
  margin-bottom: 16px;
}

.fee-item-amount {
  flex: none;
  font-variant-numeric: tabular-nums;
}

/* 代購：+1 我也要 */
.joiner-line {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 12px;
  margin: 2px 0;
  font-size: var(--step--1);
}

.joiner-line > strong {
  color: var(--ink);
}

.joiner {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
}

.joiner form {
  display: inline;
}

.joiner .link-button {
  color: var(--ink-soft);
  font-size: var(--step--1);
}

.join-form select {
  flex: 1 1 140px;
}

.join-form input[type="number"],
.buy-quantity {
  width: 90px;
  flex: none;
  text-align: right;
}