:root {
  color-scheme: light;
  --ink: #18201f;
  --muted: #66706c;
  --line: #d9dfdc;
  --paper: #fbfbf8;
  --panel: #ffffff;
  --accent: #166b5c;
  --accent-dark: #0f4d42;
  --accent-soft: #dff1eb;
  --warn-soft: #fff0d6;
  --shadow: 0 18px 50px rgba(24, 32, 31, 0.09);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    linear-gradient(135deg, rgba(22, 107, 92, 0.08), transparent 35%),
    linear-gradient(315deg, rgba(210, 79, 58, 0.08), transparent 32%),
    var(--paper);
  color: var(--ink);
}

button,
input,
select {
  font: inherit;
}

.app-shell {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  padding: 28px 0 42px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 10px 0 22px;
}

.eyebrow {
  margin: 0 0 6px;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 0;
  font-size: clamp(2rem, 6vw, 4.4rem);
  line-height: 0.95;
}

h2 {
  margin-bottom: 0;
  font-size: 1.15rem;
}

.icon-button,
.text-button,
.primary-button {
  border: 0;
  cursor: pointer;
}

.icon-button {
  display: grid;
  width: 44px;
  height: 44px;
  place-items: center;
  border-radius: 8px;
}

.subtle {
  background: var(--panel);
  color: var(--muted);
  box-shadow: inset 0 0 0 1px var(--line);
}

.summary-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.summary-card,
.panel,
.balance-panel {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.86);
  box-shadow: var(--shadow);
}

.summary-card {
  padding: 18px;
}

.summary-label,
label span,
legend {
  color: var(--muted);
  font-size: 0.86rem;
  font-weight: 700;
}

.summary-card strong {
  display: block;
  margin-top: 8px;
  font-size: 1.65rem;
}

.balance-panel {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 22px;
  margin: 14px 0;
  padding: 22px;
  background: linear-gradient(135deg, var(--accent-soft), #fff);
}

.balance-panel h2 {
  font-size: clamp(1.45rem, 3vw, 2.2rem);
}

.balance-panel p:last-child {
  max-width: 420px;
  margin-bottom: 0;
  color: var(--muted);
  line-height: 1.45;
}

.content-grid {
  display: grid;
  grid-template-columns: minmax(280px, 0.85fr) minmax(420px, 1.15fr);
  gap: 14px;
  align-items: start;
}

.panel {
  padding: 18px;
}

.setup-panel {
  grid-column: 1;
}

.form-panel {
  grid-column: 1;
}

.expenses-panel {
  grid-column: 2;
  grid-row: 1 / span 2;
}

.section-heading {
  margin-bottom: 16px;
}

.row-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.name-grid,
.expense-form {
  display: grid;
  gap: 14px;
}

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

.full-row {
  grid-column: 1 / -1;
}

label {
  display: grid;
  gap: 7px;
}

input,
select {
  width: 100%;
  min-height: 44px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
  padding: 10px 12px;
  outline: none;
}

input:focus,
select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(22, 107, 92, 0.14);
}

fieldset {
  margin: 0;
  padding: 0;
  border: 0;
}

legend {
  margin-bottom: 8px;
}

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

.split-options label {
  display: flex;
  min-height: 44px;
  align-items: center;
  gap: 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px 12px;
  background: #fff;
}

.split-options input {
  width: 18px;
  min-height: 18px;
  accent-color: var(--accent);
}

.primary-button {
  min-height: 48px;
  border-radius: 8px;
  background: var(--accent);
  color: #fff;
  font-weight: 800;
}

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

.text-button {
  min-height: 36px;
  border-radius: 8px;
  background: var(--accent-soft);
  color: var(--accent-dark);
  padding: 0 12px;
  font-weight: 800;
}

.empty-state {
  border: 1px dashed var(--line);
  border-radius: 8px;
  color: var(--muted);
  padding: 20px;
  text-align: center;
}

.expense-list {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.expense-item {
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: 14px;
  align-items: center;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 13px;
  background: #fff;
}

.expense-title {
  margin-bottom: 4px;
  font-weight: 850;
  overflow-wrap: anywhere;
}

.expense-meta {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 0.88rem;
}

.expense-amount {
  font-weight: 900;
  white-space: nowrap;
}

.delete-button {
  display: grid;
  width: 36px;
  height: 36px;
  place-items: center;
  border: 0;
  border-radius: 8px;
  background: #f7ded8;
  color: #8b2f20;
  cursor: pointer;
}

.warn {
  background: var(--warn-soft);
}

@media (max-width: 820px) {
  .summary-grid,
  .content-grid,
  .expense-form,
  .split-options {
    grid-template-columns: 1fr;
  }

  .expenses-panel,
  .setup-panel,
  .form-panel {
    grid-column: auto;
    grid-row: auto;
  }

  .balance-panel {
    display: block;
  }

  .balance-panel p:last-child {
    margin-top: 12px;
  }
}

@media (max-width: 520px) {
  .app-shell {
    width: min(100% - 20px, 1120px);
    padding-top: 14px;
  }

  .topbar {
    align-items: flex-start;
  }

  .summary-card,
  .panel,
  .balance-panel {
    padding: 14px;
  }

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

  .expense-amount {
    grid-column: 1;
  }
}