/* ============================================================
   Design tokens
   概念：行李吊牌（luggage tag）—— 深松石綠 + 吊牌金，紙質背景，
   圓角風格為規格書明確要求的視覺方向。
   ============================================================ */
:root {
  --color-ink: #1e2a2e;
  --color-ink-soft: #4a5551;
  --color-bg: #efece2;
  --color-surface: #ffffff;
  --color-surface-2: #f7f5ec;
  --color-border: #dcd6c4;
  --color-primary: #2f6e68;
  --color-primary-dark: #1f4d49;
  --color-primary-tint: #e3edec;
  --color-accent: #e3a23c;
  --color-accent-tint: #fbf0da;
  --color-danger: #c1554d;
  --color-danger-tint: #f8e6e4;
  --color-muted: #7c8480;

  --member-1: #2f6e68;
  --member-2: #e3a23c;
  --member-3: #c1554d;
  --member-4: #3b6ea8;
  --member-5: #7a6bae;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-pill: 999px;

  --font-display: "Space Grotesk", "Noto Sans TC", sans-serif;
  --font-body: "Inter", "Noto Sans TC", sans-serif;

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 48px;

  --shadow-tag: 0 1px 0 rgba(30, 42, 46, 0.04), 0 8px 20px -12px rgba(30, 42, 46, 0.35);
  --touch-min: 44px;

  color-scheme: light;
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
.font-display {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 0;
}

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

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

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

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }
}

/* ============================================================
   Layout shells
   ============================================================ */
#app {
  min-height: 100%;
}

.screen {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.screen-centered {
  align-items: center;
  justify-content: center;
  padding: var(--space-5);
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-primary-dark);
  margin-bottom: var(--space-6);
}

.brand-mark {
  width: 34px;
  height: 34px;
  border-radius: var(--radius-sm);
  background: var(--color-primary);
  position: relative;
  flex-shrink: 0;
}
.brand-mark::before {
  content: "";
  position: absolute;
  inset: 8px;
  border: 2px solid #fff;
  border-radius: 3px;
}

/* ============================================================
   Card / panel primitives
   ============================================================ */
.panel {
  width: 100%;
  max-width: 420px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-tag);
}

.panel h1 {
  font-size: 1.5rem;
  margin-bottom: var(--space-2);
}

.panel .lede {
  color: var(--color-ink-soft);
  margin-bottom: var(--space-5);
  font-size: 0.95rem;
}

.option-row {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.option-card {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  width: 100%;
  text-align: left;
  padding: var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface-2);
  cursor: pointer;
  min-height: var(--touch-min);
  transition: border-color 0.15s ease, transform 0.1s ease;
}
.option-card:hover {
  border-color: var(--color-primary);
}
.option-card:active {
  transform: scale(0.99);
}
.option-card .icon {
  font-size: 1.4rem;
  flex-shrink: 0;
}
.option-card .title {
  font-weight: 600;
  font-size: 0.98rem;
}
.option-card .desc {
  color: var(--color-ink-soft);
  font-size: 0.85rem;
}

/* Forms */
.field {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}
.field label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-ink-soft);
}
.field input,
.field textarea,
.field select {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  min-height: var(--touch-min);
  background: var(--color-surface);
}
.field input:focus,
.field textarea:focus,
.field select:focus {
  border-color: var(--color-primary);
}
.field .hint {
  font-size: 0.78rem;
  color: var(--color-muted);
}
.field-error {
  color: var(--color-danger);
  font-size: 0.82rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  border: none;
  border-radius: var(--radius-pill);
  padding: 12px 20px;
  min-height: var(--touch-min);
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.1s ease, background 0.15s ease;
}
.btn:active {
  transform: scale(0.97);
}
.btn-primary {
  background: var(--color-primary);
  color: #fff;
}
.btn-primary:hover {
  background: var(--color-primary-dark);
}
.btn-primary:disabled {
  background: var(--color-muted);
  cursor: not-allowed;
  transform: none;
}
.btn-ghost {
  background: transparent;
  color: var(--color-primary-dark);
  border: 1px solid var(--color-border);
}
.btn-block {
  width: 100%;
}
.btn-sm {
  padding: 8px 14px;
  min-height: 36px;
  font-size: 0.85rem;
}
.btn-icon {
  width: var(--touch-min);
  height: var(--touch-min);
  padding: 0;
  border-radius: var(--radius-pill);
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
}

.link-back {
  margin-top: var(--space-5);
  font-size: 0.85rem;
  color: var(--color-ink-soft);
  text-decoration: none;
}

/* ============================================================
   Trip main page
   ============================================================ */
.trip-shell {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.trip-header {
  position: sticky;
  top: 0;
  z-index: 5;
  background: var(--color-bg);
  padding: var(--space-4) var(--space-4) var(--space-3);
  border-bottom: 1px solid var(--color-border);
}

.trip-header-top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
}

.trip-name {
  font-size: 1.3rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  min-width: 0;
}
.trip-name-row {
  display: flex;
  align-items: center;
  gap: 2px;
  min-width: 0;
  flex: 1;
}

.trip-progress-text {
  font-family: var(--font-display);
  font-size: 0.95rem;
  color: var(--color-primary-dark);
  white-space: nowrap;
}

.progress-track {
  height: 8px;
  border-radius: var(--radius-pill);
  background: var(--color-border);
  overflow: hidden;
  margin-bottom: var(--space-3);
}
.progress-fill {
  height: 100%;
  background: var(--color-accent);
  border-radius: var(--radius-pill);
  transition: width 0.3s ease;
}

.member-progress-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: var(--space-3);
}
.member-progress-row {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
.member-progress-name {
  font-size: 0.78rem;
  color: var(--color-ink-soft);
  flex-shrink: 0;
  max-width: 90px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.member-progress-track {
  flex: 1;
  height: 5px;
  border-radius: var(--radius-pill);
  background: var(--color-border);
  overflow: hidden;
}
.member-progress-fill {
  height: 100%;
  background: var(--color-primary);
  border-radius: var(--radius-pill);
  transition: width 0.3s ease;
}
.member-progress-frac {
  font-size: 0.72rem;
  color: var(--color-muted);
  flex-shrink: 0;
  min-width: 34px;
  text-align: right;
}

.member-row {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  overflow-x: auto;
  padding-bottom: 2px;
}
.member-row::-webkit-scrollbar {
  height: 4px;
}

.avatar {
  --size: 38px;
  width: var(--size);
  height: var(--size);
  border-radius: var(--radius-pill);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.9rem;
  color: #fff;
  flex-shrink: 0;
  position: relative;
  border: 2px solid var(--color-bg);
}
.avatar img {
  width: 100%;
  height: 100%;
  border-radius: var(--radius-pill);
  object-fit: cover;
}
.avatar .dot {
  position: absolute;
  bottom: -1px;
  right: -1px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-muted);
  border: 2px solid var(--color-bg);
}
.avatar .dot.online {
  background: #4caf6e;
}
.avatar-chip {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  flex-shrink: 0;
}
.avatar-chip.clickable {
  cursor: pointer;
}
.avatar-chip .name {
  font-size: 0.68rem;
  color: var(--color-ink-soft);
  max-width: 48px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.avatar-chip-avatar {
  position: relative;
  display: inline-flex;
}
.kick-btn {
  position: absolute;
  top: -4px;
  right: -4px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--color-danger, #c1554d);
  color: #fff;
  border: 2px solid var(--color-bg);
  font-size: 10px;
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  padding: 0;
}

.invite-chip {
  flex-shrink: 0;
  border-radius: var(--radius-pill);
  border: 1px dashed var(--color-border);
  padding: 6px 14px;
  min-height: var(--touch-min);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
  background: var(--color-surface-2);
  cursor: pointer;
  white-space: nowrap;
}

.tab-bar {
  display: flex;
  gap: var(--space-2);
  margin-top: var(--space-3);
}
.tab-btn {
  flex: 1;
  border: 1px solid var(--color-border);
  background: var(--color-surface-2);
  border-radius: var(--radius-pill);
  padding: 8px 12px;
  min-height: 38px;
  font-weight: 600;
  font-size: 0.88rem;
  color: var(--color-ink-soft);
  cursor: pointer;
}
.tab-btn.active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
}

.balance-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}
.balance-row {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
.balance-name {
  flex: 1;
  font-size: 0.9rem;
}
.balance-amount {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.88rem;
  color: var(--color-ink-soft);
}
.balance-amount.positive {
  color: #2f7d4f;
}
.balance-amount.negative {
  color: var(--color-danger);
}

.transfer-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.transfer-row {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 0.86rem;
  background: var(--color-surface-2);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
}
.transfer-amount {
  margin-left: auto;
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--color-primary-dark);
}

.custom-split-row {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: 4px 0;
}
.custom-split-row input {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 6px 8px;
  min-height: 36px;
}

.trip-body {
  flex: 1;
  padding: var(--space-4);
  display: grid;
  gap: var(--space-4);
  grid-template-columns: 1fr;
  align-content: start;
  padding-bottom: 96px; /* 讓 FAB 不擋到最後一張卡片 */
}

@media (min-width: 860px) {
  .trip-body {
    grid-template-columns: repeat(2, 1fr);
    padding: var(--space-6);
    padding-bottom: 96px;
  }
}
@media (min-width: 1280px) {
  .trip-body {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* 分類卡片：左側色條 + 右上角斜切一角，呼應「行李吊牌」意象 */
.category-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-tag);
  --tag-color: var(--color-primary);
}

.category-head {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4);
  cursor: pointer;
  border-left: 6px solid var(--tag-color);
  min-height: var(--touch-min);
}
.category-head .chev {
  transition: transform 0.15s ease;
  color: var(--color-muted);
  flex-shrink: 0;
}
.category-card.collapsed .chev {
  transform: rotate(-90deg);
}
.category-head .title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.02rem;
  flex: 1;
}
.category-head .count {
  font-size: 0.82rem;
  color: var(--color-ink-soft);
  background: var(--color-surface-2);
  padding: 2px 10px;
  border-radius: var(--radius-pill);
}
.category-head .menu-btn {
  color: var(--color-muted);
  background: none;
  border: none;
  cursor: pointer;
  width: 32px;
  height: 32px;
}

.category-items {
  border-top: 1px solid var(--color-border);
}
.category-card.collapsed .category-items {
  display: none;
}
.category-card.collapsed .category-footer {
  display: none;
}

.item-row {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--color-surface-2);
}
.item-row:last-child {
  border-bottom: none;
}
.item-main {
  flex: 1;
  min-width: 0;
}
.item-name {
  font-weight: 500;
  font-size: 0.95rem;
}
.item-name .qty {
  color: var(--color-muted);
  font-weight: 400;
}
.item-meta {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-top: 2px;
}
.mode-tag {
  font-size: 0.72rem;
  padding: 2px 8px;
  border-radius: var(--radius-pill);
  background: var(--color-surface-2);
  color: var(--color-ink-soft);
}
.mode-tag.assigned {
  background: var(--color-accent-tint);
  color: #7a5417;
}

.check-group {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
}
.check-box {
  width: var(--touch-min);
  height: var(--touch-min);
  border-radius: var(--radius-sm);
  border: 2px solid var(--color-border);
  background: var(--color-surface);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: transparent;
  font-size: 1.1rem;
  flex-shrink: 0;
}
.check-box.checked {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
}
.check-box-blank {
  width: var(--touch-min);
  height: var(--touch-min);
  flex-shrink: 0;
}
.check-box-disabled,
.check-box:disabled {
  cursor: not-allowed;
  opacity: 0.45;
}
.item-actions {
  display: flex;
  gap: 4px;
}
.icon-btn {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  border: none;
  background: transparent;
  color: var(--color-muted);
  cursor: pointer;
}
.icon-btn:hover {
  background: var(--color-surface-2);
}

.reorder-group {
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex-shrink: 0;
}
.reorder-btn {
  width: 26px;
  height: 20px;
  font-size: 0.6rem;
  line-height: 1;
  padding: 0;
}
.reorder-btn:disabled {
  opacity: 0.25;
  cursor: not-allowed;
}
.reorder-btn:disabled:hover {
  background: transparent;
}

.category-footer {
  padding: var(--space-2) var(--space-4) var(--space-3);
}

.add-category-card {
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-lg);
  min-height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-ink-soft);
  cursor: pointer;
  font-weight: 600;
  background: transparent;
}
.add-category-card:hover {
  border-color: var(--color-primary);
  color: var(--color-primary-dark);
}

.empty-state {
  grid-column: 1/-1;
  text-align: center;
  padding: var(--space-7) var(--space-4);
  color: var(--color-ink-soft);
}
.empty-state .title {
  font-family: var(--font-display);
  font-size: 1.1rem;
  color: var(--color-ink);
  margin-bottom: var(--space-2);
}

/* FAB */
.fab {
  position: fixed;
  right: var(--space-5);
  bottom: var(--space-5);
  z-index: 6;
  border-radius: var(--radius-pill);
  background: var(--color-primary);
  color: #fff;
  border: none;
  padding: 14px 22px;
  font-weight: 600;
  box-shadow: 0 10px 24px -8px rgba(31, 77, 73, 0.55);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: var(--touch-min);
}

/* ============================================================
   Modals / bottom sheet
   在手機（<768px）用底部彈出（bottom sheet），桌面用置中彈窗（modal）
   ============================================================ */
.overlay {
  position: fixed;
  inset: 0;
  background: rgba(30, 42, 46, 0.45);
  z-index: 20;
  display: flex;
  align-items: flex-end;
  justify-content: center;
}
.sheet {
  width: 100%;
  max-width: 480px;
  background: var(--color-surface);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  padding: var(--space-5);
  max-height: 88vh;
  overflow-y: auto;
  animation: sheet-up 0.18s ease-out;
}
@keyframes sheet-up {
  from {
    transform: translateY(16px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}
@media (min-width: 768px) {
  .overlay {
    align-items: center;
  }
  .sheet {
    border-radius: var(--radius-lg);
    max-height: 80vh;
  }
}

.sheet-handle {
  width: 36px;
  height: 4px;
  border-radius: var(--radius-pill);
  background: var(--color-border);
  margin: 0 auto var(--space-4);
}
@media (min-width: 768px) {
  .sheet-handle {
    display: none;
  }
}

.sheet-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-4);
}
.sheet-head h2 {
  font-size: 1.2rem;
}
.sheet-close {
  background: none;
  border: none;
  color: var(--color-muted);
  font-size: 1.3rem;
  cursor: pointer;
  width: var(--touch-min);
  height: var(--touch-min);
}

.mode-options {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}
.mode-option {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-2);
  text-align: center;
  cursor: pointer;
  font-size: 0.8rem;
  min-height: var(--touch-min);
  display: flex;
  align-items: center;
  justify-content: center;
}
.mode-option.active {
  border-color: var(--color-primary);
  background: var(--color-primary-tint);
  color: var(--color-primary-dark);
  font-weight: 600;
}

.avatar-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: var(--space-2);
  margin-bottom: var(--space-2);
}
@media (min-width: 480px) {
  .avatar-grid {
    grid-template-columns: repeat(6, 1fr);
  }
}
.avatar-pick {
  aspect-ratio: 1;
  border-radius: var(--radius-pill);
  border: 2px solid transparent;
  background: var(--color-surface-2);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding: 0;
}
.avatar-pick img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.avatar-pick.selected {
  border-color: var(--color-primary);
}
.avatar-pick.none {
  font-size: 0.7rem;
  color: var(--color-ink-soft);
  text-align: center;
}

.member-select-grid {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}
.member-select-chip {
  display: flex;
  align-items: center;
  gap: 6px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  padding: 6px 12px 6px 6px;
  cursor: pointer;
  min-height: 36px;
}
.member-select-chip.active {
  border-color: var(--color-primary);
  background: var(--color-primary-tint);
}

.invite-link-box {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-3);
  background: var(--color-surface-2);
  font-size: 0.82rem;
  word-break: break-all;
  margin-bottom: var(--space-4);
}

/* Toasts */
#toast-root {
  position: fixed;
  bottom: var(--space-5);
  left: 50%;
  transform: translateX(-50%);
  z-index: 50;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  align-items: center;
  pointer-events: none;
}
.toast {
  background: var(--color-ink);
  color: #fff;
  padding: 10px 18px;
  border-radius: var(--radius-pill);
  font-size: 0.85rem;
  box-shadow: var(--shadow-tag);
}
.toast.error {
  background: var(--color-danger);
}

/* Utility */
.stack {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}
.row-between {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.muted {
  color: var(--color-ink-soft);
}
.center-note {
  text-align: center;
  color: var(--color-ink-soft);
  padding: var(--space-6);
}