:root {
  --color-bg: #f5f6f8;
  --color-surface: #ffffff;
  --color-border: #e2e5ea;
  --color-text: #1c1f26;
  --color-text-muted: #6b7280;
  --color-accent: #2f6fed;
  --color-accent-contrast: #ffffff;
  --color-danger: #d64545;
  --color-warning: #e0a512;
  --color-over: #d64545;
  --color-success: #2f9e5c;
  --radius: 10px;
  --spacing: 16px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--font);
  background: var(--color-bg);
  color: var(--color-text);
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 700px;
  margin: 0 auto;
  padding: var(--spacing);
  display: flex;
  flex-direction: column;
  gap: var(--spacing);
}

.app-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--color-accent);
  color: var(--color-accent-contrast);
  padding: 14px var(--spacing);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}

.app-header h1 {
  font-size: 1.1rem;
  margin: 0;
  font-weight: 600;
}

.running-total {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  line-height: 1.2;
}

.running-total-label {
  font-size: 0.7rem;
  opacity: 0.85;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.running-total-value {
  font-size: 1.4rem;
  font-weight: 700;
}

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

.total-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.total-card-label {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.total-card-value {
  font-size: 1.25rem;
  font-weight: 700;
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--spacing);
}

.card h2 {
  margin: 0 0 12px;
  font-size: 1rem;
}

.budgets-section h2 {
  margin: 0 0 12px;
  font-size: 1rem;
}

.budgets-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.budget-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 12px;
}

.budget-card-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 8px;
  margin-bottom: 8px;
  font-size: 0.9rem;
}

.budget-card-name {
  font-weight: 600;
}

.budget-card-status {
  color: var(--color-text-muted);
  font-size: 0.82rem;
}

.budget-card-status.over-text {
  color: var(--color-over);
  font-weight: 600;
}

.budget-bar-track {
  height: 8px;
  border-radius: 999px;
  background: var(--color-bg);
  overflow: hidden;
}

.budget-bar-fill {
  height: 100%;
  background: var(--color-success);
  border-radius: 999px;
  transition: width 0.2s ease;
}

.budget-bar-fill.warning {
  background: var(--color-warning);
}

.budget-bar-fill.over {
  background: var(--color-over);
}

.form-row {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 12px;
}

.form-row label {
  font-size: 0.82rem;
  color: var(--color-text-muted);
}

input[type="text"],
input[type="number"],
input[type="date"],
select {
  font: inherit;
  padding: 10px 12px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background: var(--color-surface);
  color: var(--color-text);
  width: 100%;
}

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

.field-error {
  color: var(--color-danger);
  font-size: 0.78rem;
  min-height: 1em;
}

.form-actions {
  display: flex;
  gap: 8px;
}

button {
  font: inherit;
  cursor: pointer;
  border: none;
  border-radius: 8px;
  padding: 10px 16px;
  background: var(--color-accent);
  color: var(--color-accent-contrast);
  font-weight: 600;
}

button:hover {
  filter: brightness(1.05);
}

#cancelEditBtn {
  background: var(--color-bg);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.icon-btn {
  background: transparent;
  color: var(--color-accent);
  padding: 4px 8px;
  font-size: 0.8rem;
  font-weight: 500;
}

.icon-btn.danger {
  color: var(--color-danger);
}

.icon-btn:disabled {
  color: var(--color-text-muted);
  cursor: not-allowed;
}

.empty-state {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  padding: 8px 0;
}

.entries-table {
  width: 100%;
  border-collapse: collapse;
}

.entries-table th {
  text-align: left;
  font-size: 0.75rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.03em;
  padding: 6px 8px;
  border-bottom: 1px solid var(--color-border);
}

.entries-table td {
  padding: 10px 8px;
  border-bottom: 1px solid var(--color-border);
  font-size: 0.9rem;
}

.entries-table .col-amount {
  text-align: right;
  font-variant-numeric: tabular-nums;
}

.entries-table .col-actions {
  text-align: right;
  white-space: nowrap;
}

.section-toggle {
  background: transparent;
  color: var(--color-text);
  padding: 0;
  font-weight: 600;
  font-size: 1rem;
  display: flex;
  align-items: center;
  gap: 6px;
}

.toggle-caret {
  transition: transform 0.15s ease;
  display: inline-block;
}

.section-toggle.expanded .toggle-caret {
  transform: rotate(90deg);
}

#categoriesPanel {
  margin-top: 12px;
}

.categories-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 12px;
}

.category-row {
  display: grid;
  grid-template-columns: 1.4fr 1fr auto;
  gap: 8px;
  align-items: center;
}

.category-budget-input {
  text-align: right;
}

.add-category-form {
  display: flex;
  gap: 8px;
}

.add-category-form input {
  flex: 1;
}

@media (max-width: 600px) {
  .totals-grid {
    grid-template-columns: 1fr;
  }

  .entries-table thead {
    display: none;
  }

  .entries-table,
  .entries-table tbody,
  .entries-table tr,
  .entries-table td {
    display: block;
    width: 100%;
  }

  .entries-table tr {
    border-bottom: 1px solid var(--color-border);
    padding: 10px 0;
  }

  .entries-table td {
    border-bottom: none;
    padding: 2px 0;
    display: flex;
    justify-content: space-between;
  }

  .entries-table td::before {
    content: attr(data-label);
    font-size: 0.72rem;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.03em;
  }

  .entries-table .col-actions {
    justify-content: flex-end;
    gap: 8px;
  }

  .entries-table .col-actions::before {
    content: none;
  }

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