:root {
  --bg: #f4f7fb;
  --panel: #ffffff;
  --ink: #172033;
  --muted: #657085;
  --line: #d9e0ea;
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --income: #047857;
  --expense: #be123c;
  --shadow: 0 18px 45px rgba(23, 32, 51, 0.12);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--ink);
  background:
    linear-gradient(180deg, #dbeafe 0, rgba(219, 234, 254, 0) 21rem),
    var(--bg);
}

button,
input,
select {
  font: inherit;
}

button {
  cursor: pointer;
}

.app-shell {
  width: min(100%, 1120px);
  margin: 0 auto;
  padding: 1rem;
  display: grid;
  gap: 1rem;
}

.overview,
.entry-panel,
.insights-panel,
.transactions-panel {
  background: rgba(255, 255, 255, 0.96);
  border: 1px solid rgba(217, 224, 234, 0.9);
  border-radius: 8px;
  box-shadow: var(--shadow);
  padding: 1rem;
}

.topbar,
.section-heading,
.field-row,
.summary-grid {
  display: grid;
  gap: 0.75rem;
}

.topbar,
.section-heading {
  grid-template-columns: 1fr auto;
  align-items: center;
}

.eyebrow {
  margin: 0 0 0.2rem;
  color: var(--primary);
  font-size: 0.78rem;
  font-weight: 800;
  text-transform: uppercase;
}

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

h1 {
  margin-bottom: 0;
  font-size: clamp(1.8rem, 8vw, 2.6rem);
  line-height: 1;
}

h2 {
  margin-bottom: 0.9rem;
  font-size: 1rem;
}

.icon-button,
.primary-button,
.delete-button {
  min-height: 2.75rem;
  border: 0;
  border-radius: 6px;
  font-weight: 800;
}

.icon-button {
  padding: 0 0.85rem;
  color: var(--primary);
  background: #eff6ff;
}

.balance-panel {
  margin-top: 1.25rem;
  padding: 1.2rem;
  color: white;
  background: linear-gradient(135deg, #172033, #2563eb);
  border-radius: 8px;
}

.balance-panel span,
.summary-grid span,
.transaction-meta,
label {
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 700;
}

.balance-panel span {
  color: rgba(255, 255, 255, 0.78);
}

.balance-panel strong {
  display: block;
  margin-top: 0.4rem;
  font-size: clamp(2.1rem, 11vw, 3.4rem);
  line-height: 1;
}

.summary-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 0.75rem;
}

.summary-grid article {
  padding: 1rem;
  background: #f8fafc;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.summary-grid strong {
  display: block;
  margin-top: 0.2rem;
  font-size: 1.25rem;
}

#incomeTotal {
  color: var(--income);
}

#expenseTotal {
  color: var(--expense);
}

form {
  display: grid;
  gap: 0.75rem;
}

label {
  display: block;
  margin-bottom: 0.35rem;
}

input,
select {
  width: 100%;
  min-height: 2.9rem;
  padding: 0 0.8rem;
  color: var(--ink);
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 6px;
}

input:focus,
select:focus,
button:focus-visible {
  outline: 3px solid rgba(37, 99, 235, 0.24);
  outline-offset: 2px;
}

.field-row {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.primary-button {
  margin-top: 0.25rem;
  color: #ffffff;
  background: var(--primary);
}

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

.category-summary {
  display: grid;
  gap: 0.7rem;
}

.category-row {
  display: grid;
  grid-template-columns: minmax(5.5rem, 0.8fr) 1fr auto;
  align-items: center;
  gap: 0.65rem;
}

.category-row span {
  font-size: 0.88rem;
  font-weight: 800;
}

.bar-track {
  height: 0.55rem;
  overflow: hidden;
  background: #e2e8f0;
  border-radius: 999px;
}

.bar-fill {
  height: 100%;
  width: var(--bar-width);
  background: var(--primary);
  border-radius: inherit;
}

.transaction-list {
  padding: 0;
  margin: 0;
  list-style: none;
  display: grid;
  gap: 0.65rem;
}

.transaction-card {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 0.8rem;
  padding: 0.8rem;
  background: #f8fafc;
  border: 1px solid var(--line);
  border-left: 5px solid var(--expense);
  border-radius: 8px;
}

.transaction-card.income {
  border-left-color: var(--income);
}

.transaction-name {
  margin: 0 0 0.15rem;
  font-weight: 850;
}

.transaction-meta {
  margin: 0;
}

.transaction-amount {
  display: block;
  margin-bottom: 0.4rem;
  color: var(--expense);
  font-weight: 900;
  text-align: right;
}

.transaction-card.income .transaction-amount {
  color: var(--income);
}

.delete-button {
  min-height: 2.1rem;
  padding: 0 0.65rem;
  color: #9f1239;
  background: #ffe4e6;
}

.empty-state {
  margin: 0;
  padding: 1rem;
  color: var(--muted);
  background: #f8fafc;
  border: 1px dashed var(--line);
  border-radius: 8px;
}

@media (min-width: 760px) {
  .app-shell {
    grid-template-columns: 0.95fr 1.05fr;
    padding: 2rem;
    align-items: start;
  }

  .overview {
    grid-row: span 2;
    position: sticky;
    top: 1rem;
  }
}

@media (max-width: 430px) {
  .field-row,
  .summary-grid,
  .category-row,
  .transaction-card {
    grid-template-columns: 1fr;
  }

  .transaction-amount {
    text-align: left;
  }
}