:root {
  --n-paper: #f7f3eb;
  --n-surface: #fffdf8;
  --n-surface-deep: #efe8da;
  --n-ink: #28261f;
  --n-muted: #716c60;
  --n-line: #d9d0c0;
  --n-accent: #c45b3c;
  --n-accent-soft: #f2d9cd;
  --n-teal: #2d7771;
  --n-teal-soft: #d6e7e2;
  --n-good: #2c7650;
  --n-bad: #ad443b;
  --n-shadow: #d8d0c2;
}

.theme-dark {
  --n-paper: #24231f;
  --n-surface: #2e2c27;
  --n-surface-deep: #3a3730;
  --n-ink: #f2eee5;
  --n-muted: #b9b1a3;
  --n-line: #514c42;
  --n-accent: #ef8966;
  --n-accent-soft: #563c33;
  --n-teal: #71b8ad;
  --n-teal-soft: #294b47;
  --n-good: #74c59b;
  --n-bad: #ef897f;
  --n-shadow: #1c1b18;
}

.trip-expense-tool {
  --n-radius: 1.25rem;

  box-sizing: border-box;
  width: 100%;
  padding: clamp(1rem, 3vw, 2rem);
  color: var(--n-ink);
  background: var(--n-paper);
  border: 1px solid var(--n-line);
  border-radius: var(--n-radius);
}

.tool-intro {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  max-width: 58rem;
  margin-bottom: 1.5rem;
}

.intro-kicker,
.section-number {
  color: var(--n-accent);
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.tool-intro p {
  margin: 0;
  color: var(--n-muted);
  line-height: 1.5;
}

.splitter-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(20rem, 0.85fr);
  gap: 1rem;
  align-items: start;
}

.ledger-column,
.result-column {
  display: grid;
  gap: 1rem;
}

.ledger-section,
.result-panel {
  padding: 1.2rem;
  background: var(--n-surface);
  border: 1px solid var(--n-line);
  border-radius: var(--n-radius);
}

.result-panel {
  position: sticky;
  top: 1rem;
  overflow: hidden;
  background: var(--n-surface-deep);
}

.section-heading,
.result-heading,
.block-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.section-heading > div,
.result-heading {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.trip-expense-tool h2 {
  margin: 0;
  color: var(--n-ink);
  font-size: 1rem;
}

.trip-name-input,
.expense-description,
.amount-field input,
.traveler-row input {
  box-sizing: border-box;
  width: 100%;
  padding: 0.8rem 0.9rem;
  font: inherit;
  color: var(--n-ink);
  background: var(--n-paper);
  border: 1px solid var(--n-line);
  border-radius: 0.75rem;
  transition:
    border-color 0.18s ease,
    box-shadow 0.18s ease,
    background 0.18s ease;
}

.traveler-row input {
  min-height: 2.75rem;
  font-weight: 650;
}

.trip-name-input:hover,
.expense-description:hover,
.amount-field input:hover,
.traveler-row input:hover {
  border-color: var(--n-teal);
}

.trip-name-input {
  margin-top: 1rem;
  font-size: 1.35rem;
  font-weight: 750;
}

.trip-expense-tool input:focus,
.trip-expense-tool button:focus-visible {
  outline: 0;
  border-color: var(--n-teal);
  box-shadow: 0 0 0 3px var(--n-teal-soft);
}

.currency-row {
  display: flex;
  gap: 0.3rem;
}

.currency-chip,
.participant-chip {
  padding: 0.35rem 0.55rem;
  font: inherit;
  font-size: 0.72rem;
  font-weight: 750;
  color: var(--n-muted);
  background: transparent;
  border: 1px solid var(--n-line);
  border-radius: 99px;
  cursor: pointer;
}

.currency-chip span {
  padding-left: 0.25rem;
}

.currency-chip.is-selected,
.participant-chip.is-selected {
  color: var(--n-surface);
  background: var(--n-teal);
  border-color: var(--n-teal);
}

.text-button,
.quiet-action {
  font: inherit;
  font-size: 0.78rem;
  font-weight: 750;
  color: var(--n-teal);
  background: transparent;
  border: 0;
  cursor: pointer;
}

.traveler-list {
  display: grid;
  gap: 0.5rem;
  margin-top: 1rem;
}

.traveler-row {
  display: grid;
  grid-template-columns: 2rem 1fr 2rem;
  gap: 0.5rem;
  align-items: center;
}

.traveler-index {
  color: var(--n-muted);
  font-size: 0.72rem;
  font-variant-numeric: tabular-nums;
}

.icon-button {
  padding: 0.35rem;
  font-size: 1.3rem;
  line-height: 1;
  color: var(--n-muted);
  background: transparent;
  border: 0;
  border-radius: 0.5rem;
  cursor: pointer;
}

.icon-button:hover {
  color: var(--n-accent);
  background: var(--n-accent-soft);
}

.icon-button:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.expense-form {
  display: grid;
  grid-template-columns: 1.3fr 0.7fr;
  gap: 0.6rem;
  margin-top: 1rem;
}

.expense-description {
  grid-column: 1 / -1;
}

.amount-field {
  display: grid;
  gap: 0.3rem;
}

.amount-field span,
.field-caption {
  font-size: 0.68rem;
  font-weight: 750;
  color: var(--n-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.payer-select {
  position: relative;
}

.payer-trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  height: 100%;
  padding: 0.8rem 0.9rem;
  font: inherit;
  color: var(--n-ink);
  background: var(--n-paper);
  border: 1px solid var(--n-line);
  border-radius: 0.75rem;
  cursor: pointer;
}

.payer-menu {
  position: absolute;
  right: 0;
  left: 0;
  z-index: 3;
  display: none;
  gap: 0.25rem;
  padding: 0.35rem;
  background: var(--n-surface);
  border: 1px solid var(--n-line);
  border-radius: 0.75rem;
  box-shadow: 0 0.6rem 1rem var(--n-shadow);
}

.payer-menu:not([hidden]) {
  display: grid;
}

.payer-option {
  padding: 0.55rem;
  font: inherit;
  text-align: left;
  color: var(--n-ink);
  background: transparent;
  border: 0;
  border-radius: 0.5rem;
  cursor: pointer;
}

.payer-option:hover,
.payer-option.is-active {
  background: var(--n-teal-soft);
}

.participant-select {
  display: grid;
  grid-column: 1 / -1;
  gap: 0.45rem;
}

.participant-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.add-expense-button {
  grid-column: 1 / -1;
  padding: 0.8rem 1rem;
  font: inherit;
  font-weight: 800;
  color: var(--n-surface);
  background: var(--n-accent);
  border: 0;
  border-radius: 0.75rem;
  cursor: pointer;
}

.add-expense-button:hover,
.primary-action:hover {
  background: var(--n-teal);
}

.expense-list {
  display: grid;
  gap: 0.5rem;
  margin-top: 1rem;
}

.expense-card {
  display: grid;
  grid-template-columns: 2rem 1fr auto auto;
  gap: 0.65rem;
  align-items: center;
  padding-top: 0.7rem;
  border-top: 1px solid var(--n-line);
}

.expense-mark {
  display: grid;
  place-items: center;
  width: 2rem;
  height: 2rem;
  font-weight: 800;
  color: var(--n-accent);
  background: var(--n-accent-soft);
  border-radius: 0.6rem;
}

.expense-copy {
  display: grid;
  gap: 0.18rem;
  min-width: 0;
}

.expense-copy strong {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.expense-copy span {
  font-size: 0.72rem;
  color: var(--n-muted);
}

.expense-amount {
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.empty-copy {
  margin: 1rem 0 0;
  font-size: 0.85rem;
  color: var(--n-muted);
}

.result-status {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.72rem;
  font-weight: 800;
  color: var(--n-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.status-dot {
  width: 0.5rem;
  height: 0.5rem;
  background: var(--n-accent);
  border-radius: 99px;
}

.status-balanced .status-dot {
  background: var(--n-good);
}

.route-map {
  margin: 1rem -1.2rem 0;
  padding: 0 1rem 0.7rem;
  border-bottom: 1px solid var(--n-line);
}

.route-map svg {
  display: block;
  width: 100%;
  height: auto;
  overflow: visible;
}

.route-line {
  fill: none;
  stroke: var(--n-accent);
  stroke-dasharray: 6 7;
  stroke-width: 3;
}

.route-node {
  fill: var(--n-teal);
  stroke: var(--n-surface-deep);
  stroke-width: 5;
}

.route-map text {
  font-size: 12px;
  fill: var(--n-muted);
  text-anchor: middle;
}

.result-total {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding: 1rem 0;
}

.result-total span {
  font-size: 0.78rem;
  color: var(--n-muted);
}

.result-total strong {
  font-size: 1.7rem;
  font-variant-numeric: tabular-nums;
}

.balance-list {
  display: grid;
  gap: 0.35rem;
  padding: 0.8rem 0;
  border-top: 1px solid var(--n-line);
}

.balance-row,
.transfer-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.5rem;
  align-items: center;
  font-size: 0.8rem;
}

.positive {
  color: var(--n-good);
}

.negative {
  color: var(--n-bad);
}

.settlement-block {
  padding-top: 0.8rem;
  border-top: 1px solid var(--n-line);
}

.block-heading {
  font-size: 0.72rem;
  font-weight: 800;
  color: var(--n-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.transfer-list {
  display: grid;
  gap: 0.45rem;
  margin-top: 0.7rem;
}

.transfer-row {
  grid-template-columns: 1fr auto 1fr auto;
  color: var(--n-ink);
}

.transfer-arrow {
  font-size: 1.2rem;
  color: var(--n-accent);
}

.transfer-row strong {
  white-space: nowrap;
}

.clear-state {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--n-good);
}

.clear-state p {
  font-size: 0.8rem;
  color: var(--n-muted);
}

.clear-icon {
  font-size: 1.2rem;
}

.action-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
}

.primary-action,
.secondary-action {
  padding: 0.7rem 0.85rem;
  font: inherit;
  font-size: 0.78rem;
  font-weight: 800;
  border-radius: 0.7rem;
  cursor: pointer;
}

.primary-action {
  color: var(--n-surface);
  background: var(--n-accent);
  border: 0;
}

.secondary-action {
  color: var(--n-ink);
  background: var(--n-surface);
  border: 1px solid var(--n-line);
}

.quiet-action {
  margin-left: auto;
}

@media (max-width: 760px) {
  .splitter-layout {
    grid-template-columns: 1fr;
  }

  .result-panel {
    position: static;
  }

  .tool-intro {
    display: grid;
    gap: 0.4rem;
  }

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

  .expense-description,
  .participant-select,
  .add-expense-button {
    grid-column: auto;
  }

  .expense-card {
    grid-template-columns: 2rem 1fr auto;
  }

  .expense-card .icon-button {
    grid-row: 1;
    grid-column: 3;
  }

  .expense-amount {
    grid-column: 2 / 3;
  }

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

  .transfer-row strong {
    grid-column: 1 / -1;
    text-align: right;
  }

  .quiet-action {
    margin-left: 0;
  }
}