:root {
  --bg: #0f1115;
  --panel: #181b22;
  --panel-2: #20242e;
  --text: #e7e9ee;
  --muted: #9aa3b2;
  --accent: #6aa9ff;
  --good: #4ade80;
  --bad: #f87171;
  --border: #2a2f3a;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

header {
  padding: 1.5rem 2rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

header h1 { margin: 0; font-size: 1.5rem; }

.currency-setting {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--muted);
}

.currency-setting input {
  width: 5rem;
  text-transform: uppercase;
}

main {
  display: grid;
  gap: 1.25rem;
  grid-template-columns: repeat(auto-fit, minmax(360px, 1fr));
  padding: 1.5rem;
  max-width: 1400px;
  margin: 0 auto;
}

.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.25rem;
}

.card h2 { margin: 0 0 1rem; font-size: 1.1rem; }
.card h3 { margin: 1.25rem 0 0.5rem; font-size: 0.95rem; color: var(--muted); }

input, select, button {
  font: inherit;
  color: var(--text);
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.5rem 0.7rem;
}

input:focus, select:focus { outline: 2px solid var(--accent); outline-offset: -1px; }

button {
  background: var(--accent);
  color: #0b1220;
  border: none;
  font-weight: 600;
  cursor: pointer;
}

button.danger {
  background: transparent;
  color: var(--bad);
  border: 1px solid var(--border);
  padding: 0.25rem 0.5rem;
  font-weight: 500;
}

.row { display: flex; gap: 0.5rem; }
.row input { flex: 1; }

.grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

.grid label {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  font-size: 0.85rem;
  color: var(--muted);
}

.grid label input,
.grid label select { color: var(--text); }

.grid fieldset, .grid > button { grid-column: 1 / -1; }

fieldset.participants {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.75rem;
}

fieldset.participants legend { color: var(--muted); padding: 0 0.25rem; font-size: 0.85rem; }

.participant-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.25rem 0;
}

.participant-row input[type="number"] {
  width: 100px;
  margin-left: auto;
}

.hint { color: var(--muted); font-size: 0.8rem; margin: 0.5rem 0 0; }
.hint.error { color: var(--bad); }

ul { list-style: none; padding: 0; margin: 0; }

.people-list li {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.4rem 0;
  border-bottom: 1px solid var(--border);
}
.people-list li:last-child { border-bottom: none; }

table { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
th, td {
  text-align: left;
  padding: 0.5rem 0.4rem;
  border-bottom: 1px solid var(--border);
}
th { color: var(--muted); font-weight: 500; }

.balances li,
.settlements li {
  display: flex;
  justify-content: space-between;
  padding: 0.4rem 0;
  border-bottom: 1px solid var(--border);
}
.balances li:last-child, .settlements li:last-child { border-bottom: none; }

.amount.pos { color: var(--good); }
.amount.neg { color: var(--bad); }
.amount.zero { color: var(--muted); }

.empty { color: var(--muted); font-style: italic; padding: 0.5rem 0; }

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}
.card-header h2 { margin: 0; }

.expenses-card { grid-column: 1 / -1; }

.table-wrap { overflow-x: auto; }

#expenses-table { min-width: 100%; }

.share-cell { text-align: right; white-space: nowrap; }
.share-cell.payer { color: var(--good); font-weight: 600; }
.share-cell.absent { color: var(--muted); }

button.secondary {
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--border);
  font-weight: 500;
}

button.icon-btn {
  background: transparent;
  color: var(--muted);
  font-size: 1.5rem;
  line-height: 1;
  padding: 0 0.5rem;
  border: none;
  cursor: pointer;
}
button.icon-btn:hover { color: var(--text); }

dialog#expense-dialog {
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 0;
  max-width: 560px;
  width: calc(100% - 2rem);
}
dialog#expense-dialog::backdrop {
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(2px);
}
dialog#expense-dialog form { padding: 1.25rem; margin: 0; }

.dialog-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  grid-column: 1 / -1;
  margin: -0.25rem 0 0.25rem;
}
.dialog-header h2 { margin: 0; font-size: 1.1rem; }

.dialog-actions {
  grid-column: 1 / -1;
  display: flex;
  justify-content: flex-end;
  gap: 0.5rem;
  margin-top: 0.5rem;
}

td .row-actions { display: flex; gap: 0.25rem; justify-content: flex-end; }