:root {
  --blue: #1f6feb;
  --blue-dark: #1558c0;
  --bg: #f5f7fb;
  --card: #ffffff;
  --border: #d8dee9;
  --text: #1f2937;
  --muted: #6b7280;
  --success: #15803d;
  --danger: #b91c1c;
  --shadow: 0 1px 3px rgba(15, 23, 42, 0.08);
}

* {
  box-sizing: border-box;
}

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

h1, h2, h3 {
  margin: 0 0 0.5rem;
}

.subtitle {
  color: var(--muted);
  margin: 0;
}

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 1rem;
}

.page-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
  max-width: 960px;
  margin: 0 auto;
  padding: 1.5rem 1rem 0;
}

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

.section-block {
  margin-bottom: 1.5rem;
}

hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 1.5rem 0;
}

button,
.btn,
.btn-icon {
  pointer-events: auto;
  cursor: pointer;
}

.btn {
  border: none;
  border-radius: 8px;
  padding: 0.55rem 1rem;
  font-size: 0.95rem;
  transition: background 0.15s ease;
}

.btn-primary {
  background: var(--blue);
  color: #fff;
}

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

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

.btn-dashed {
  width: 100%;
  margin-top: 0.75rem;
  background: transparent;
  border: 2px dashed var(--border);
  color: var(--muted);
}

.btn-icon {
  background: transparent;
  border: none;
  color: var(--muted);
  cursor: pointer;
  padding: 0.25rem 0.4rem;
  font-size: 1rem;
}

.color-picker {
  width: 32px;
  height: 32px;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: #fff;
  cursor: pointer;
}

.color-picker::-webkit-color-swatch-wrapper {
  padding: 3px;
}

.color-picker::-webkit-color-swatch {
  border: none;
  border-radius: 4px;
}

.income-tree,
.expense-tree {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form-hint {
  color: var(--muted);
  font-size: 0.9rem;
  margin: 0 0 1.25rem;
}

.row,
.category-row {
  display: grid;
  grid-template-columns: auto 1fr minmax(220px, 1.1fr) auto;
  gap: 0.5rem;
  align-items: center;
  padding: 0.5rem;
  padding-left: 0.6rem;
  border: 1px solid var(--border);
  border-left-width: 4px;
  border-radius: 8px;
  background: #fafbfc;
}

.child-list {
  margin: 0.5rem 0 0 2rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.child-row {
  display: grid;
  grid-template-columns: auto 1fr minmax(220px, 1.1fr) auto;
  gap: 0.5rem;
  align-items: center;
  padding: 0.45rem;
  padding-left: 0.55rem;
  border: 1px dashed var(--border);
  border-left-width: 4px;
  border-radius: 8px;
  background: #fff;
}

.amount-field {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.35rem 0.4rem;
  align-items: center;
}

.amount-field input[data-field="amount"] {
  width: 100%;
  min-width: 0;
}

.unit-toggle {
  display: flex;
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow: hidden;
  flex-shrink: 0;
}

.unit-btn {
  border: none;
  background: #fff;
  padding: 0.35rem 0.55rem;
  font-size: 0.85rem;
  color: var(--muted);
}

.unit-btn.active {
  background: var(--blue);
  color: #fff;
}

.unit-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.amount-field input[data-field="amount"]:disabled {
  opacity: 0.7;
  background: #f3f4f6;
}

.amount-hint {
  grid-column: 1 / -1;
  font-size: 0.75rem;
  color: var(--muted);
  line-height: 1.2;
}

.category-sum {
  font-size: 0.75rem;
  color: var(--muted);
  margin: 0.25rem 0 0 1.75rem;
}

.drag-handle {
  cursor: grab;
  color: var(--muted);
  user-select: none;
  font-size: 1.1rem;
  line-height: 1;
}

.row input[type="text"],
.row input[type="number"],
.child-row input[type="text"],
.child-row input[type="number"],
.category-row input[type="text"],
.category-row input[type="number"] {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.45rem 0.6rem;
  font-size: 0.95rem;
}

.amount-field input[data-field="amount"] {
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.45rem 0.6rem;
  font-size: 0.95rem;
}

.row-actions {
  display: flex;
  gap: 0.15rem;
}

.controls-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
  margin-top: 1.25rem;
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--muted);
}

.height-input {
  width: 90px;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.45rem 0.6rem;
}

.height-input:disabled {
  opacity: 0.5;
}

.save-status {
  color: var(--muted);
  font-size: 0.9rem;
}

.save-status.saved {
  color: var(--success);
}

.save-status.error {
  color: var(--danger);
}

.results-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1rem;
}

.toggle-group {
  display: flex;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}

.toggle-btn {
  border: none;
  background: #fff;
  padding: 0.45rem 0.9rem;
  cursor: pointer;
}

.toggle-btn.active {
  background: var(--blue);
  color: #fff;
}

#sankey-container {
  width: 100%;
  overflow-x: auto;
  margin-bottom: 1.5rem;
}

#sankey-chart {
  width: 100%;
  display: block;
}

.sankey-link {
  fill: none;
  stroke-opacity: 0.45;
}

.sankey-node rect {
  stroke: none;
}

.sankey-label {
  font-size: 12px;
  fill: var(--text);
  pointer-events: none;
}

.tables {
  display: grid;
  gap: 1rem;
}

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

.data-table caption {
  text-align: left;
  font-weight: 600;
  margin-bottom: 0.35rem;
}

.data-table th,
.data-table td {
  border-bottom: 1px solid var(--border);
  padding: 0.45rem 0.25rem;
}

.data-table th.num,
.data-table td.num {
  text-align: right;
}

.data-table tr.sum td {
  font-weight: 600;
}

.difference {
  font-weight: 600;
  margin: 0.5rem 0 0;
}

.difference.positive {
  color: var(--success);
}

.difference.negative {
  color: var(--danger);
}

.login-page {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 1rem;
}

.login-card {
  width: min(100%, 380px);
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: var(--shadow);
}

.login-card form {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.login-card label {
  font-weight: 500;
}

.login-card input[type="password"] {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.6rem 0.75rem;
  font-size: 1rem;
}

.alert {
  padding: 0.65rem 0.75rem;
  border-radius: 8px;
  margin-bottom: 0.75rem;
}

.alert-error {
  background: #fef2f2;
  color: var(--danger);
  border: 1px solid #fecaca;
}

.dragging {
  opacity: 0.5;
}

.drop-target {
  outline: 2px dashed var(--blue);
}

@media (max-width: 640px) {
  .row,
  .category-row,
  .child-row {
    grid-template-columns: 1fr;
  }

  .drag-handle {
    display: none;
  }

  .child-list {
    margin-left: 0.5rem;
  }
}