.app-shell {
  width: min(1180px, 100%);
  margin: 0 auto;
  padding: var(--space-4);
}

.app-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding-block: var(--space-4) var(--space-6);
}

.brand {
  display: flex;
  gap: var(--space-3);
  align-items: center;
  min-width: 0;
}

.brand-mark {
  display: grid;
  width: 48px;
  height: 48px;
  flex: 0 0 48px;
  place-items: center;
  border-radius: 14px;
  background: var(--color-primary);
  color: #fff;
  box-shadow: var(--shadow-sm);
}

.brand h1 {
  margin: 0;
  font-size: clamp(1.35rem, 3vw, 2rem);
  line-height: 1.2;
}

.brand p {
  margin: var(--space-1) 0 0;
  color: var(--color-muted);
}

.header-actions,
.inline-actions,
.nav-tabs,
.segmented,
.chips,
.family-row,
.expense-row,
.settlement-row,
.member-list {
  display: flex;
  gap: var(--space-2);
  align-items: center;
  flex-wrap: wrap;
}

.nav-tabs {
  position: sticky;
  top: 0;
  z-index: 10;
  margin-block-end: var(--space-5);
  padding: var(--space-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: color-mix(in srgb, var(--color-surface) 92%, transparent);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-sm);
}

.tab-button,
.button,
.icon-button {
  min-height: 44px;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--color-text);
  transition: background 160ms ease, border-color 160ms ease, transform 160ms ease;
}

.tab-button {
  padding: 0 var(--space-4);
  color: var(--color-muted);
}

.tab-button[aria-selected="true"] {
  background: var(--color-primary-soft);
  color: var(--color-primary-strong);
}

.button {
  display: inline-flex;
  gap: var(--space-2);
  align-items: center;
  justify-content: center;
  padding: 0 var(--space-4);
  background: var(--color-primary);
  color: #fff;
  font-weight: 700;
}

.button.secondary {
  border-color: var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
}

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

.icon-button {
  display: grid;
  width: 44px;
  padding: 0;
  place-items: center;
  border-color: var(--color-border);
  background: var(--color-surface);
}

.button:active,
.tab-button:active,
.icon-button:active {
  transform: scale(0.98);
}

.icon {
  width: 20px;
  height: 20px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 2;
}

.grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(320px, 0.85fr);
  gap: var(--space-5);
  align-items: start;
}

.panel,
.card,
.empty-state {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  box-shadow: var(--shadow-sm);
}

.panel {
  padding: var(--space-5);
}

.panel + .panel {
  margin-block-start: var(--space-4);
}

.panel h2,
.panel h3,
.card h3 {
  margin: 0 0 var(--space-3);
  line-height: 1.3;
}

.muted {
  color: var(--color-muted);
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-4);
}

.field {
  display: grid;
  gap: var(--space-2);
}

.field.full,
.form-grid .full {
  grid-column: 1 / -1;
}

label,
.label {
  color: var(--color-muted);
  font-size: 0.92rem;
  font-weight: 700;
}

input,
select,
textarea {
  width: 100%;
  min-height: 46px;
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  color: var(--color-text);
}

textarea {
  min-height: 82px;
  resize: vertical;
}

.error {
  margin: 0;
  color: var(--color-danger);
  font-size: 0.9rem;
}

.summary-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-3);
}

.stat {
  padding: var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
}

.stat span {
  display: block;
  color: var(--color-muted);
  font-size: 0.86rem;
}

.stat strong {
  display: block;
  margin-block-start: var(--space-1);
  font-size: 1.2rem;
}

.card {
  padding: var(--space-4);
}

.list {
  display: grid;
  gap: var(--space-3);
}

.color-dot,
.avatar {
  display: inline-grid;
  width: 28px;
  height: 28px;
  flex: 0 0 28px;
  place-items: center;
  border-radius: 999px;
  background: var(--chip-color, var(--color-secondary));
  color: white;
  font-size: 0.75rem;
  font-weight: 800;
}

.chip {
  display: inline-flex;
  gap: var(--space-1);
  align-items: center;
  min-height: 32px;
  padding: 0 var(--space-2);
  border-radius: 999px;
  background: var(--color-surface-muted);
  color: var(--color-text);
  font-size: 0.86rem;
}

.check-row {
  display: flex;
  gap: var(--space-2);
  align-items: center;
  min-height: 40px;
  padding: var(--space-2);
  border-radius: var(--radius-sm);
  background: var(--color-surface-muted);
}

.check-row input {
  width: 18px;
  min-height: 18px;
}

.participant-select-all {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2);
  margin-block-end: var(--space-3);
  border-radius: var(--radius-sm);
  background: var(--color-surface-muted);
  cursor: pointer;
  font-weight: 500;
  font-size: 0.9rem;
}
.participant-select-all input {
  width: 18px;
  min-height: 18px;
}

.family-group {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-block-end: var(--space-3);
}

.family-group-header {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  font-weight: 500;
}
.family-group-header .color-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}
.family-group-header .family-name {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.family-group-header label {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  font-size: 0.78rem;
  cursor: pointer;
  white-space: nowrap;
}
.family-group-header label input {
  width: 16px;
  min-height: 16px;
}

.family-group-body {
  padding: var(--space-1) var(--space-2);
}
.family-group-body .check-row {
  border-radius: 0;
  background: transparent;
  min-height: 36px;
  padding: var(--space-1) var(--space-2);
}

.empty-state {
  display: grid;
  min-height: 180px;
  place-items: center;
  padding: var(--space-6);
  text-align: center;
}

.skeleton {
  background: linear-gradient(90deg, var(--color-surface-muted) 25%, var(--color-border) 50%, var(--color-surface-muted) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius-sm);
}

@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

.skeleton-text {
  height: 16px;
  width: 60%;
  margin-block-end: var(--space-2);
}

.skeleton-block {
  height: 80px;
  width: 100%;
}

.toast {
  position: fixed;
  inset-inline: var(--space-4);
  inset-block-end: var(--space-4);
  z-index: 200;
  width: min(520px, calc(100% - 32px));
  margin-inline: auto;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  background: var(--color-text);
  color: var(--color-surface);
  box-shadow: var(--shadow-md);
  display: flex;
  gap: var(--space-3);
  align-items: center;
}

[hidden] {
  display: none !important;
}

.bar-chart {
  display: grid;
  gap: var(--space-2);
}

.bar-row {
  display: grid;
  grid-template-columns: auto auto 1fr auto;
  gap: var(--space-2);
  align-items: center;
  min-height: 36px;
}

.bar-label {
  font-size: 0.86rem;
  color: var(--color-text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.bar-track {
  height: 20px;
  border-radius: 999px;
  background: var(--color-surface-muted);
  overflow: hidden;
}

.bar-fill {
  display: block;
  height: 100%;
  border-radius: 999px;
  transition: width 400ms ease;
}

.bar-value {
  font-size: 0.86rem;
  font-weight: 700;
  color: var(--color-text);
  white-space: nowrap;
  text-align: end;
}

.currency-badge {
  display: inline-flex;
  align-items: center;
  padding: 0 var(--space-2);
  min-height: 22px;
  border-radius: 4px;
  background: var(--color-surface-muted);
  color: var(--color-muted);
  font-size: 0.75rem;
  font-weight: 700;
  white-space: nowrap;
}

.lock-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  min-height: 26px;
  padding: 0;
  border: none;
  border-radius: 4px;
  background: transparent;
  color: var(--color-muted);
  cursor: pointer;
  font-size: 0.86rem;
  transition: background 160ms ease;
}

.lock-btn:hover {
  background: var(--color-surface-muted);
}

.lock-btn.locked {
  color: var(--color-primary);
}

.share-input {
  min-height: 28px;
  height: 28px;
  padding: 0 var(--space-1);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  background: var(--color-surface);
  color: var(--color-text);
  font-size: 0.86rem;
  text-align: left;
  direction: ltr;
  box-sizing: border-box;
}

.share-input:focus {
  border-color: var(--color-primary);
  outline: none;
}

.share-preview {
  padding: var(--space-3);
  margin-block-start: var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface-muted);
  font-size: 0.86rem;
}

.share-preview-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-3);
}

.share-preview-row + .share-preview-row {
  margin-block-start: var(--space-1);
}

.share-preview-label {
  color: var(--color-muted);
}

.share-preview-value {
  font-weight: 700;
  direction: ltr;
  text-align: right;
}

body[dir="ltr"] .share-preview-value {
  text-align: left;
}

@media (max-width: 860px) {
  .app-shell {
    padding: var(--space-3);
    padding-block-end: 84px;
  }

  .app-header,
  .grid,
  .summary-grid,
  .form-grid {
    grid-template-columns: 1fr;
  }

  .header-actions {
    justify-content: stretch;
  }

  .header-actions > * {
    flex: 1 1 140px;
  }

  .nav-tabs {
    position: fixed;
    inset-inline: var(--space-3);
    inset-block: auto var(--space-3);
    justify-content: space-between;
  }

  .tab-button {
    flex: 1 1 0;
    padding: 0 var(--space-2);
  }
}

@keyframes skeleton-pulse {
  0% { opacity: 0.4; }
  50% { opacity: 0.8; }
  100% { opacity: 0.4; }
}

.skeleton {
  background: var(--color-border);
  border-radius: var(--radius);
  animation: skeleton-pulse 1.5s ease-in-out infinite;
  color: transparent !important;
  user-select: none;
  pointer-events: none;
}

.skeleton-text {
  display: inline-block;
  height: 1em;
  width: 60%;
  vertical-align: middle;
}

.skeleton-block {
  display: block;
  height: 80px;
  margin-block-end: var(--space-3);
}

.trip-card-grid {
  display: grid;
  gap: var(--space-3);
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  margin-block-start: var(--space-4);
}

.trip-card {
  display: flex;
  flex-direction: column;
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.15s;
}

.trip-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0,0,0,0.12);
}

.trip-card h3 {
  margin: 0;
}

.trip-card.archived {
  opacity: 0.7;
  filter: grayscale(0.5);
}

.settlement-row {
  transition: opacity 0.2s;
}

.settlement-row:has(.settle-checkbox:checked) {
  opacity: 0.5;
  text-decoration: line-through;
}

#settlement-panel .list {
  page-break-inside: avoid;
}

@media print {
  .app-header, .nav-tabs, #toast, [data-action="close-trip"], .tab-button, .button:not(#print-settlement) { display: none !important; }
  main { padding: 0 !important; }
  .card { box-shadow: none !important; border: 1px solid #ddd !important; }
  #print-settlement { display: none !important; }
}

@media (max-width: 600px) {
  .trip-card-grid {
    grid-template-columns: 1fr;
  }
}

.bottom-nav {
  position: fixed;
  inset-block-end: 0;
  inset-inline: 0;
  display: flex;
  background: var(--color-surface);
  border-block-start: 1px solid var(--color-border);
  padding: var(--space-1) 0;
  z-index: 100;
  box-shadow: 0 -2px 12px rgba(0,0,0,0.08);
}

.bottom-nav .tab-button {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: var(--space-1) var(--space-2);
  font-size: 0.7rem;
  background: none;
  border: none;
  color: var(--color-muted);
  cursor: pointer;
  min-height: 48px;
  border-radius: 0;
}

.bottom-nav .tab-button[aria-selected="true"] {
  color: var(--color-primary);
  font-weight: 600;
}

.bottom-nav .icon {
  width: 22px;
  height: 22px;
}

@media (min-width: 601px) {
  .bottom-nav {
    position: static;
    box-shadow: none;
    border-block-start: none;
    border-block-end: 1px solid var(--color-border);
    padding: 0;
    margin-block-end: var(--space-4);
  }
  .bottom-nav .tab-button {
    flex-direction: row;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-4);
    font-size: 0.85rem;
    min-height: auto;
  }
  .bottom-nav .icon {
    width: 18px;
    height: 18px;
  }
}

main {
  transition: opacity 0.2s ease;
}

.card {
  transition: transform 0.15s, box-shadow 0.15s, opacity 0.2s;
}

.card.fade-in {
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}