/* ===== Reset & Base ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --color-bg: #f5f7fa;
  --color-surface: #ffffff;
  --color-border: #e1e5eb;
  --color-text: #1a1a2e;
  --color-text-muted: #6b7280;
  --color-primary: #2563eb;
  --color-primary-light: #dbeafe;
  --color-danger: #ef4444;
  --color-danger-light: #fee2e2;
  --color-warning: #f59e0b;
  --color-warning-light: #fef3c7;
  --color-success: #10b981;
  --color-success-light: #d1fae5;
  --radius: 8px;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.08), 0 1px 2px rgba(0, 0, 0, 0.06);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: "SF Mono", "Fira Code", monospace;
  --sidebar-width: 320px;
}

/* Dark theme */
[data-theme="dark"] {
  --color-bg: #111827;
  --color-surface: #1f2937;
  --color-border: #374151;
  --color-text: #f3f4f6;
  --color-text-muted: #9ca3af;
  --color-primary: #60a5fa;
  --color-primary-light: rgba(96, 165, 250, 0.15);
  --color-danger: #f87171;
  --color-danger-light: rgba(248, 113, 113, 0.15);
  --color-warning: #fbbf24;
  --color-warning-light: rgba(251, 191, 36, 0.15);
  --color-success: #34d399;
  --color-success-light: rgba(52, 211, 153, 0.15);
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.3), 0 1px 2px rgba(0, 0, 0, 0.2);
}

body {
  font-family: var(--font);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

[data-theme="dark"] input,
[data-theme="dark"] select {
  color-scheme: dark;
}

/* ===== Header ===== */
header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: 0.625rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-shrink: 0;
}

header h1 {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-text);
}

.header-controls {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.header-field {
  display: flex;
  align-items: center;
  gap: 0.375rem;
}

.header-field label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.03em;
  white-space: nowrap;
}

.header-field input {
  width: 72px;
  padding: 0.3125rem 0.5rem;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  font-size: 0.8125rem;
  font-family: var(--font-mono);
  color: var(--color-text);
  background: var(--color-bg);
}

.header-field input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 2px var(--color-primary-light);
}

.header-field.field-error input {
  border-color: var(--color-danger);
  box-shadow: 0 0 0 2px var(--color-danger-light);
}

.header-field .validation-msg {
  position: absolute;
  top: 100%;
  left: 0;
  white-space: nowrap;
}

.header-field {
  position: relative;
}

/* Theme toggle */
.btn-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  background: var(--color-bg);
  color: var(--color-text-muted);
  cursor: pointer;
  transition: all 0.15s;
  flex-shrink: 0;
}

.btn-icon:hover {
  color: var(--color-primary);
  border-color: var(--color-primary);
}

/* Show sun in dark mode, moon in light mode */
.icon-sun { display: none; }
.icon-moon { display: block; }
[data-theme="dark"] .icon-sun { display: block; }
[data-theme="dark"] .icon-moon { display: none; }

/* ===== App Layout ===== */
.app-layout {
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr;
  flex: 1;
  min-height: 0;
}

/* ===== Inputs Panel (sidebar) ===== */
.inputs-panel {
  background: var(--color-surface);
  border-right: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* Input tabs (BBD / Withdrawal / Windfalls) */
.input-tabs {
  display: flex;
  border-bottom: 2px solid var(--color-border);
  flex-shrink: 0;
}

.input-tab {
  flex: 1;
  padding: 0.625rem 0.25rem;
  border: none;
  background: none;
  font-size: 0.6875rem;
  font-weight: 600;
  font-family: var(--font);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.02em;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  transition: all 0.15s;
  white-space: nowrap;
}

.input-tab:hover {
  color: var(--color-text);
}

.input-tab.active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

.input-tab-content {
  flex: 1;
  overflow-y: auto;
}

.input-tab-pane {
  display: none;
  padding: 1rem 1.25rem;
}

.input-tab-pane.active {
  display: block;
}

/* ===== Fields ===== */
.field {
  margin-bottom: 0.625rem;
}

.field:last-child {
  margin-bottom: 0;
}

.field-row {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 0.625rem;
}

.field-half {
  flex: 1;
  margin-bottom: 0;
}

.computed-value {
  padding: 0.4375rem 0.5rem;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  font-size: 0.8125rem;
  font-family: var(--font-mono);
  color: var(--color-primary);
  background: var(--color-bg);
  min-height: 2rem;
  display: flex;
  align-items: center;
  font-weight: 600;
}

.field label {
  display: block;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: 0.1875rem;
}

.field input[type="number"] {
  width: 100%;
  padding: 0.4375rem 0.5rem;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  font-size: 0.8125rem;
  font-family: var(--font-mono);
  color: var(--color-text);
  background: var(--color-bg);
  transition: border-color 0.15s;
}

.field input[type="number"]:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 2px var(--color-primary-light);
}

.field-checkbox label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.75rem;
  cursor: pointer;
}

.field-checkbox input[type="checkbox"] {
  width: 0.875rem;
  height: 0.875rem;
  accent-color: var(--color-primary);
}

.help-text {
  font-size: 0.6875rem;
  color: var(--color-text-muted);
  margin-bottom: 0.75rem;
}

/* Inline validation errors */
.field-error input,
input.input-error {
  border-color: var(--color-danger) !important;
  box-shadow: 0 0 0 2px var(--color-danger-light) !important;
}

.validation-msg {
  display: none;
  font-size: 0.625rem;
  color: var(--color-danger);
  margin-top: 0.125rem;
  font-weight: 500;
}

.field-error .validation-msg {
  display: block;
}

/* ===== Toggle Switch ===== */
.toggle-bar {
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--color-border);
}

.toggle-label {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  font-size: 0.8125rem;
  font-weight: 600;
  cursor: pointer;
  user-select: none;
}

.toggle-label input[type="checkbox"] {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.toggle-switch {
  position: relative;
  width: 36px;
  height: 20px;
  background: var(--color-border);
  border-radius: 10px;
  transition: background 0.2s;
  flex-shrink: 0;
}

.toggle-switch::after {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 16px;
  height: 16px;
  background: white;
  border-radius: 50%;
  transition: transform 0.2s;
  box-shadow: 0 1px 2px rgba(0,0,0,0.2);
}

.toggle-label input:checked + .toggle-switch {
  background: var(--color-primary);
}

.toggle-label input:checked + .toggle-switch::after {
  transform: translateX(16px);
}

#wdFields.disabled {
  opacity: 0.35;
  pointer-events: none;
}

/* ===== Windfall Rows ===== */
.windfall-headers {
  display: grid;
  grid-template-columns: 72px 1fr 1fr auto;
  gap: 0.375rem;
  margin-bottom: 0.25rem;
}

.windfall-headers span {
  font-size: 0.625rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--color-text-muted);
}

.windfall-row {
  display: grid;
  grid-template-columns: 72px 1fr 1fr auto;
  gap: 0.375rem;
  margin-bottom: 0.5rem;
  align-items: center;
}

.windfall-row input {
  padding: 0.375rem 0.5rem;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  font-size: 0.75rem;
  font-family: var(--font-mono);
  background: var(--color-bg);
  color: var(--color-text);
}

.windfall-row input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 2px var(--color-primary-light);
}

.windfall-row input[type="text"] {
  font-family: var(--font);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.4375rem 0.875rem;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  background: var(--color-surface);
  color: var(--color-text);
  font-size: 0.75rem;
  font-family: var(--font);
  cursor: pointer;
  transition: all 0.15s;
}

.btn:hover {
  background: var(--color-bg);
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.btn-small {
  padding: 0.3125rem 0.625rem;
  font-size: 0.6875rem;
}

.btn-remove {
  padding: 0.25rem 0.5rem;
  border: none;
  background: none;
  color: var(--color-text-muted);
  cursor: pointer;
  font-size: 1rem;
  line-height: 1;
  border-radius: 4px;
}

.btn-remove:hover {
  background: var(--color-danger-light);
  color: var(--color-danger);
}

/* ===== Chart Panel ===== */
.chart-panel {
  padding: 1rem;
  display: flex;
  align-items: stretch;
  min-height: 0;
}

.chart-container {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1rem;
  box-shadow: var(--shadow);
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 320px;
  position: relative;
}

.chart-title {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.03em;
  margin-bottom: 0.5rem;
  flex-shrink: 0;
}

.chart-canvas-wrap {
  position: relative;
  flex: 1;
  min-height: 0;
}

.chart-canvas-wrap canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100% !important;
  height: 100% !important;
}

.chart-detail {
  min-height: 300px;
  max-height: 400px;
}

/* ===== Detail Section ===== */
.detail-section {
  flex-shrink: 0;
  border-top: 1px solid var(--color-border);
}

/* ===== Tabs (detail) ===== */
.tabs {
  display: flex;
  gap: 0;
  background: var(--color-surface);
  border-bottom: 2px solid var(--color-border);
  padding-left: 1.25rem;
}

.tab {
  padding: 0.625rem 1.25rem;
  border: none;
  background: none;
  font-size: 0.8125rem;
  font-weight: 500;
  font-family: var(--font);
  color: var(--color-text-muted);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  transition: all 0.15s;
}

.tab:hover {
  color: var(--color-text);
}

.tab.active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

.tab-content {
  background: var(--color-surface);
}

.tab-pane {
  display: none;
  padding: 1rem 1.25rem;
}

.tab-pane.active {
  display: block;
}

/* ===== Tables ===== */
.table-header {
  display: flex;
  justify-content: flex-end;
  margin-top: 0.5rem;
  margin-bottom: 0.25rem;
}

.btn-export {
  font-size: 0.625rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.table-wrap {
  overflow-x: auto;
  overflow-y: auto;
  max-height: 60vh;
  position: relative;
}

.table-header + .table-wrap {
  margin-top: 0;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.75rem;
  white-space: nowrap;
}

thead th {
  position: sticky;
  top: 0;
  z-index: 2;
  background: var(--color-bg);
  padding: 0.5rem 0.625rem;
  text-align: right;
  font-weight: 600;
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--color-text-muted);
  border-bottom: 2px solid var(--color-border);
}

thead th:first-child {
  text-align: left;
}

tbody td {
  padding: 0.375rem 0.625rem;
  text-align: right;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  border-bottom: 1px solid var(--color-border);
}

tbody td:first-child {
  text-align: left;
  font-weight: 600;
  font-family: var(--font);
}

tbody tr:hover {
  background: var(--color-primary-light);
}

/* Row states */
tr.row-danger {
  background: var(--color-danger-light) !important;
}

tr.row-warning {
  background: var(--color-warning-light) !important;
}

tr.row-success {
  background: var(--color-success-light) !important;
}

tr.row-muted td {
  color: var(--color-text-muted);
  opacity: 0.5;
}

td.val-negative {
  color: var(--color-danger) !important;
}

/* Windfall badge in table */
.windfall-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  background: #ede9fe;
  color: #6d28d9;
  padding: 0.125rem 0.5rem;
  border-radius: 999px;
  font-size: 0.625rem;
  font-family: var(--font);
  font-weight: 500;
  cursor: default;
}

[data-theme="dark"] .windfall-badge {
  background: rgba(139, 92, 246, 0.2);
  color: #c4b5fd;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  :root {
    --sidebar-width: 100%;
  }

  .app-layout {
    grid-template-columns: 1fr;
  }

  .inputs-panel {
    border-right: none;
    border-bottom: 1px solid var(--color-border);
  }

  .chart-panel {
    min-height: 300px;
  }

  header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
  }

  .tabs {
    overflow-x: auto;
    padding-left: 0.75rem;
  }

  .tab {
    padding: 0.5rem 0.875rem;
    font-size: 0.75rem;
  }

  .windfall-headers {
    display: none;
  }

  .windfall-row {
    grid-template-columns: 64px 1fr auto;
  }

  .windfall-row input[type="text"] {
    grid-column: 1 / -2;
    order: 3;
  }
}