:root {
  --panel: #ffffff;
  --panel-strong: #f6f6f6;
  --text: #111111;
  --muted: #555555;
  --line: #d8d8d8;
  --accent: #222222;
  --accent-dark: #000000;
  --good: #176b3a;
  --bad: #a22c2c;
  --warn: #666666;
  --shadow: none;
  --radius: 6px;
  --radius-sm: 4px;
  --font-display: "Segoe UI", Tahoma, sans-serif;
  --font-body: "Segoe UI", Tahoma, sans-serif;
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-body);
  color: var(--text);
  background: #f2f2f2;
}

.page {
  width: min(1200px, calc(100% - 16px));
  margin: 0 auto;
  padding: 8px 0 12px;
  position: relative;
}

.page.is-loading > section {
  display: none !important;
}

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

.meta-line,
.expense-subtitle,
.empty-state,
.status-text {
  color: var(--muted);
  font-size: 0.85rem;
  line-height: 1.45;
}

.landing-view,
.trip-view,
.stack {
  display: grid;
  gap: 10px;
}

.trip-view {
  gap: 12px;
}

.layout {
  display: grid;
  grid-template-columns: minmax(320px, 410px) minmax(0, 1fr);
  gap: 10px;
  align-items: start;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  border-radius: var(--radius);
  overflow: hidden;
}

.panel-inner {
  padding: 10px;
}

.trip-form,
.modal-form {
  background: transparent;
  border: 0;
  border-radius: 0;
  padding: 0;
}

.trip-list {
  display: grid;
  gap: 6px;
}

.trip-card {
  display: grid;
  gap: 8px;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: #fafafa;
}

.trip-card-main,
.trip-card-footer,
.panel-title,
.member-item,
.expense-item,
.result-item,
.transfer-item {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
}

.trip-total {
  font-family: var(--font-display);
  font-size: 1rem;
  line-height: 1.2;
  white-space: nowrap;
}

.trip-empty {
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
}

form {
  display: grid;
  gap: 8px;
}

label {
  display: grid;
  gap: 4px;
  font-size: 0.9rem;
  color: var(--muted);
}

input,
select,
button {
  font: inherit;
}

input[type="text"],
input[type="number"],
select {
  width: 100%;
  padding: 8px 10px;
  border-radius: 4px;
  border: 1px solid var(--line);
  background: #ffffff;
  color: var(--text);
  transition: border-color 120ms ease;
}

input:focus,
select:focus {
  outline: none;
  border-color: #888888;
}

.row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 6px;
}

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

.trip-header,
.trip-heading {
  display: grid;
  gap: 8px;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.trip-heading {
  grid-auto-flow: column;
  justify-content: start;
  align-items: center;
}

.trip-heading h1 {
  font-size: clamp(1.7rem, 2.2vw, 2.2rem);
  line-height: 1.1;
}

.form-actions,
.expense-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.form-actions {
  justify-content: flex-start;
}

button {
  border: 0;
  border-radius: 4px;
  padding: 8px 12px;
  cursor: pointer;
  transition: background 120ms ease, opacity 120ms ease;
}

.primary-btn {
  background: var(--accent);
  color: #ffffff;
  font-family: var(--font-display);
  font-weight: 600;
}

.primary-btn:hover {
  background: var(--accent-dark);
}

.ghost-btn {
  background: #efefef;
  color: var(--text);
  border: 1px solid var(--line);
}

.compact-btn {
  padding: 6px 10px;
  font-size: 0.85rem;
}

.members-list,
.expense-list,
.result-list,
.transfer-list {
  display: grid;
  gap: 6px;
}

.member-item,
.expense-item,
.result-item,
.transfer-item,
.check-option,
.stat-card {
  border: 1px solid var(--line);
  border-radius: 4px;
  background: #fafafa;
  padding: 8px 10px;
}

.member-meta,
.expense-meta {
  min-width: 0;
}

.member-name,
.expense-title,
.result-name,
.transfer-names {
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--text);
}

.danger-btn {
  background: #f3f3f3;
  color: var(--bad);
  border: 0;
  padding: 6px 10px;
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 600;
}

.danger-btn:hover {
  background: #ececec;
}

.checkbox-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 6px;
}

.check-option {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 8px;
  color: var(--text);
}

.check-option input {
  width: 18px;
  height: 18px;
  accent-color: var(--accent);
  margin: 0;
}

.message {
  min-height: 1.1em;
  font-size: 0.85rem;
}

.message.error {
  color: var(--bad);
}

.message.success {
  color: var(--good);
}

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

.amount {
  font-family: var(--font-display);
  font-weight: 600;
  white-space: nowrap;
}

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

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

.amount.neutral {
  color: var(--warn);
}

.stat-strip {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
  margin-top: 10px;
}

.stat-card span {
  display: block;
  color: var(--muted);
  font-size: 0.8rem;
  margin-bottom: 4px;
}

.stat-card strong {
  font-family: var(--font-display);
  font-size: 1.05rem;
}

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(17, 17, 17, 0.35);
  display: grid;
  place-items: center;
  padding: 16px;
  z-index: 20;
}

.modal-shell {
  width: min(540px, 100%);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 12px;
  display: grid;
  gap: 10px;
}

@media (max-width: 900px) {
  .layout,
  .results-grid,
  .stat-strip,
  .row.compact {
    grid-template-columns: 1fr;
  }

  .page {
    width: min(100% - 12px, 1200px);
    padding-top: 6px;
  }

  .panel-inner {
    padding: 8px;
  }

  .trip-heading {
    grid-auto-flow: row;
    justify-content: start;
    align-items: start;
  }
}