/**
 * Tax Credit Calculator — soft light palette (slate-lavender)
 * Compact list + sticky total panel on the right.
 */

:root {
  --tc-bg-start: #f7f5fb;
  --tc-bg-end: #e8eef8;
  --tc-surface: #ffffff;
  --tc-surface-soft: #f4f6fb;
  --tc-surface-muted: #eef1f8;
  --tc-primary: #5b6abf;
  --tc-primary-dark: #4a58a8;
  --tc-primary-soft: #eef0fa;
  --tc-primary-border: #c5cce8;
  --tc-accent: #7b8fd4;
  --tc-text: #2c3348;
  --tc-text-muted: #6b7389;
  --tc-border: #dde2ef;
  --tc-shadow: 0 2px 12px rgba(91, 106, 191, 0.08);
  --tc-radius: 12px;
  --tc-radius-sm: 8px;
  --tc-formula-width: 300px;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: linear-gradient(145deg, var(--tc-bg-start) 0%, var(--tc-bg-end) 100%);
  min-height: 100vh;
  color: var(--tc-text);
  line-height: 1.45;
}

.container {
  position: relative;
  max-width: 1180px;
  margin: 0 auto;
  padding: 16px 18px 24px;
}

/* Override shared nav accents for this page */
.site-top-nav a {
  color: var(--tc-primary-dark);
  border-color: var(--tc-primary-border);
  box-shadow: 0 1px 3px rgba(91, 106, 191, 0.08);
}

.site-top-nav a:hover,
.site-top-nav a.is-current {
  background: var(--tc-primary-soft);
  border-color: var(--tc-primary);
  color: var(--tc-primary-dark);
}

.header {
  text-align: center;
  margin-bottom: 18px;
}

.header h1 {
  color: var(--tc-primary-dark);
  margin-bottom: 6px;
  font-size: 1.85rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.header p {
  color: var(--tc-text-muted);
  font-size: 0.95rem;
  max-width: 640px;
  margin: 0 auto;
}

.header .year-badge {
  display: inline-block;
  margin-top: 8px;
  padding: 3px 11px;
  background: var(--tc-primary-soft);
  color: var(--tc-primary-dark);
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 600;
  border: 1px solid var(--tc-primary-border);
}

/* Outer: years | main */
.calculator-layout {
  display: flex;
  gap: 14px;
  margin-bottom: 20px;
  align-items: flex-start;
}

.year-sidebar {
  width: 120px;
  flex-shrink: 0;
}

.year-sidebar h3 {
  color: var(--tc-primary-dark);
  margin: 0 0 8px 0;
  font-size: 0.95rem;
  font-weight: 600;
}

.year-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.year-button {
  padding: 10px 12px;
  border: 2px solid var(--tc-border);
  border-radius: var(--tc-radius-sm);
  background: var(--tc-surface);
  cursor: pointer;
  transition: all 0.2s ease;
  text-align: left;
  display: flex;
  flex-direction: column;
  gap: 2px;
  color: var(--tc-text);
  font-family: inherit;
}

.year-button:hover:not(.disabled):not(.active) {
  border-color: var(--tc-primary);
  box-shadow: var(--tc-shadow);
}

.year-button.active {
  background: var(--tc-primary);
  border-color: var(--tc-primary);
  color: #fff;
  box-shadow: 0 3px 12px rgba(91, 106, 191, 0.28);
}

.year-button.disabled {
  opacity: 0.55;
  cursor: not-allowed;
  background: var(--tc-surface-muted);
}

.year-label {
  font-size: 15px;
  font-weight: 600;
}

.year-note {
  font-size: 10px;
  opacity: 0.85;
}

.main-content {
  flex: 1;
  min-width: 0;
}

/* Workspace: list | sticky formula — always side-by-side (flex, not stacked) */
.workspace {
  display: flex;
  flex-direction: row;
  flex-wrap: nowrap;
  gap: 14px;
  align-items: flex-start;
  width: 100%;
}

/* Panels */
.panel,
.formula-panel {
  background: var(--tc-surface);
  border-radius: var(--tc-radius);
  border: 1px solid var(--tc-border);
  box-shadow: var(--tc-shadow);
  overflow: hidden;
}

.list-panel {
  flex: 1 1 0;
  min-width: 0;
}

.formula-panel {
  flex: 0 0 var(--tc-formula-width);
  width: var(--tc-formula-width);
  max-width: var(--tc-formula-width);
  position: sticky;
  top: 12px;
  align-self: flex-start;
  display: flex;
  flex-direction: column;
  max-height: calc(100vh - 24px);
}

.panel-header {
  padding: 10px 12px;
  background: linear-gradient(180deg, var(--tc-surface-soft) 0%, var(--tc-surface) 100%);
  border-bottom: 1px solid var(--tc-border);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.panel-header-text {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 10px;
  min-width: 0;
}

.panel-header h2 {
  font-size: 1rem;
  font-weight: 650;
  color: var(--tc-primary-dark);
}

.panel-header .currency-hint {
  font-size: 0.78rem;
  color: var(--tc-text-muted);
  font-weight: 500;
}

.list-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
}

.panel-body {
  padding: 2px 0 4px;
}

/* Compact credit list */
.credit-section-title {
  padding: 8px 12px 3px;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--tc-accent);
}

.credit-row {
  display: grid;
  grid-template-columns: auto 1fr auto auto;
  align-items: center;
  gap: 6px 8px;
  padding: 5px 12px;
  border-bottom: 1px solid #f0f2f8;
  transition: background 0.12s ease;
  /* Allow selecting label/amount text to copy; click still toggles when no selection */
  user-select: text;
  -webkit-user-select: text;
  cursor: pointer;
}

.credit-check {
  display: flex;
  align-items: center;
  cursor: pointer;
  margin: 0;
  user-select: none;
}

.credit-row:last-child {
  border-bottom: none;
}

.credit-row:hover {
  background: var(--tc-primary-soft);
}

.credit-row.is-checked {
  background: linear-gradient(90deg, rgba(91, 106, 191, 0.09) 0%, transparent 100%);
}

.credit-row.is-indent {
  padding-left: 28px;
}

.credit-row.is-indent-2 {
  padding-left: 40px;
}

.credit-row input[type="checkbox"] {
  width: 15px;
  height: 15px;
  margin: 0;
  accent-color: var(--tc-primary);
  cursor: pointer;
  flex-shrink: 0;
}

.credit-main {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.credit-label {
  font-size: 0.82rem;
  color: var(--tc-text);
  line-height: 1.3;
  cursor: default;
}

.credit-extras {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 10px;
  align-items: center;
}

.credit-extras[hidden] {
  display: none !important;
}

.extra-field {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.72rem;
  color: var(--tc-text-muted);
  font-weight: 500;
}

.extra-field input {
  width: 88px;
  padding: 3px 6px;
  border: 1px solid var(--tc-border);
  border-radius: 5px;
  font-size: 0.8rem;
  font-variant-numeric: tabular-nums;
  color: var(--tc-text);
  background: #fff;
}

.extra-field input:focus {
  outline: none;
  border-color: var(--tc-primary);
  box-shadow: 0 0 0 2px rgba(91, 106, 191, 0.15);
}

.credit-allowance-note {
  font-size: 0.68rem;
  color: var(--tc-text-muted);
  font-style: italic;
}

.other-rpn-block {
  padding: 4px 0 10px;
  border-top: 1px solid var(--tc-border);
  margin-top: 4px;
}

.other-rpn-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 12px;
  padding: 6px 12px;
}

.other-rpn-row label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--tc-text);
}

.other-rpn-row input {
  width: 120px;
  padding: 6px 8px;
  border: 2px solid var(--tc-border);
  border-radius: 6px;
  font-size: 0.9rem;
  font-variant-numeric: tabular-nums;
}

.other-rpn-row input:focus {
  outline: none;
  border-color: var(--tc-primary);
}

.other-rpn-hint {
  padding: 0 12px 6px;
  font-size: 0.72rem;
  color: var(--tc-text-muted);
  line-height: 1.4;
}

.formula-warnings {
  margin-top: 10px;
  padding: 8px 10px;
  background: #fff8e6;
  border: 1px solid #f0d78c;
  border-radius: 8px;
  font-size: 0.72rem;
  color: #6b5a20;
  line-height: 1.4;
}

.formula-warnings[hidden] {
  display: none !important;
}

.formula-warnings ul {
  margin: 0;
  padding-left: 1.1rem;
}

.formula-warnings li {
  margin-bottom: 4px;
}

.formula-warnings li:last-child {
  margin-bottom: 0;
}

.formula-term .term-name em {
  font-style: normal;
  font-size: 0.65rem;
  color: #b8860b;
  margin-left: 4px;
}

/* Little “i” info control */
.info-btn {
  width: 18px;
  height: 18px;
  padding: 0;
  border-radius: 50%;
  border: 1.5px solid var(--tc-primary-border);
  background: var(--tc-primary-soft);
  color: var(--tc-primary-dark);
  font-size: 0.68rem;
  font-weight: 700;
  font-family: Georgia, "Times New Roman", serif;
  font-style: italic;
  line-height: 1;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

.info-btn:hover,
.info-btn:focus-visible {
  background: var(--tc-primary);
  border-color: var(--tc-primary);
  color: #fff;
  outline: none;
}

.info-btn.is-active {
  background: var(--tc-primary);
  border-color: var(--tc-primary);
  color: #fff;
  box-shadow: 0 0 0 3px rgba(91, 106, 191, 0.25);
}

/* Floating “when to apply” panel */
.credit-info-panel {
  position: absolute;
  z-index: 1000;
  max-width: 360px;
  background: #fff;
  border: 1px solid var(--tc-primary-border);
  border-radius: 12px;
  box-shadow: 0 12px 36px rgba(44, 51, 72, 0.18), 0 2px 8px rgba(91, 106, 191, 0.12);
  overflow: hidden;
}

.credit-info-panel[hidden] {
  display: none !important;
}

.credit-info-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 10px;
  padding: 12px 14px 10px;
  background: linear-gradient(180deg, var(--tc-primary-soft) 0%, #f8f9fd 100%);
  border-bottom: 1px solid var(--tc-border);
}

.credit-info-header h3 {
  margin: 0;
  font-size: 0.88rem;
  font-weight: 650;
  color: var(--tc-primary-dark);
  line-height: 1.35;
  padding-right: 4px;
}

.credit-info-close {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  border: none;
  border-radius: 6px;
  background: transparent;
  color: var(--tc-text-muted);
  font-size: 1.25rem;
  line-height: 1;
  cursor: pointer;
}

.credit-info-close:hover {
  background: rgba(0, 0, 0, 0.06);
  color: var(--tc-text);
}

.credit-info-body {
  padding: 12px 14px 14px;
  font-size: 0.8rem;
  color: var(--tc-text);
  line-height: 1.45;
}

.credit-info-label {
  margin: 0 0 4px;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--tc-accent);
}

.credit-info-body p {
  margin: 0 0 10px;
}

.credit-info-body p:last-child {
  margin-bottom: 0;
}

.credit-info-sources {
  font-size: 0.75rem;
  color: var(--tc-text-muted);
}

.credit-info-sources a {
  color: var(--tc-primary-dark);
  font-weight: 600;
  text-decoration: none;
}

.credit-info-sources a:hover {
  text-decoration: underline;
}

.credit-info-disclaimer {
  margin-top: 8px !important;
  padding-top: 8px;
  border-top: 1px dashed var(--tc-border);
  font-size: 0.7rem !important;
  color: var(--tc-text-muted);
  font-style: italic;
}

.credit-row.is-indent .credit-label,
.credit-row.is-indent-2 .credit-label {
  color: var(--tc-text-muted);
  font-size: 0.78rem;
}

.credit-amount {
  font-variant-numeric: tabular-nums;
  font-weight: 650;
  color: var(--tc-primary-dark);
  font-size: 0.82rem;
  white-space: nowrap;
  min-width: 3.6rem;
  text-align: right;
}

.credit-row .credit-badge {
  display: inline-block;
  margin-left: 5px;
  padding: 0 5px;
  font-size: 0.62rem;
  font-weight: 650;
  border-radius: 999px;
  background: #f0ebe4;
  color: #8a6d4a;
  vertical-align: middle;
  letter-spacing: 0.02em;
  line-height: 1.4;
}

.formula-panel-header {
  padding: 10px 12px;
  background: linear-gradient(180deg, var(--tc-primary-soft) 0%, #f8f9fd 100%);
  border-bottom: 1px solid var(--tc-border);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  flex-shrink: 0;
}

.formula-panel-header h2 {
  font-size: 0.95rem;
  font-weight: 650;
  color: var(--tc-primary-dark);
}

.btn-ghost {
  font-family: inherit;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 5px 10px;
  border-radius: 6px;
  border: 1px solid var(--tc-primary-border);
  background: #fff;
  color: var(--tc-primary-dark);
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease;
  white-space: nowrap;
}

.btn-ghost:hover {
  background: var(--tc-primary-soft);
  border-color: var(--tc-primary);
}

.btn-clear {
  border-color: #e0c8c8;
  color: #8b4a4a;
}

.btn-clear:hover {
  background: #fdf2f2;
  border-color: #c97a7a;
}

.formula-body {
  padding: 12px;
  overflow-y: auto;
  flex: 1;
  min-height: 0;
}

.formula-use-home {
  margin: 10px 0 0;
}

.formula-use-home .btn-ghost {
  display: inline-block;
  text-decoration: none;
}

.formula-empty {
  color: var(--tc-text-muted);
  font-size: 0.82rem;
  font-style: italic;
  line-height: 1.4;
  margin-bottom: 8px;
}

.formula-empty[hidden] {
  display: none !important;
}

/* Vertical addition stack — easy to watch as ticks appear */
.formula-expression {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 0.9rem;
  font-variant-numeric: tabular-nums;
}

.formula-expression.is-empty {
  display: none;
}

.formula-eq-row {
  color: var(--tc-primary);
  font-weight: 700;
  font-size: 0.9rem;
  padding: 6px 2px 4px 6px;
  user-select: none;
}

.formula-eq-row.is-empty {
  display: none;
}

.formula-term {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 6px 8px;
  background: var(--tc-surface-soft);
  border: 1px solid var(--tc-border);
  border-radius: 7px;
  color: var(--tc-text);
  font-weight: 600;
  animation: term-in 0.2s ease;
}

.formula-term .term-name {
  font-size: 0.7rem;
  font-weight: 500;
  color: var(--tc-text-muted);
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  flex: 1;
}

.formula-term .term-value {
  flex-shrink: 0;
  font-size: 0.88rem;
  color: var(--tc-primary-dark);
}

.formula-op {
  color: var(--tc-accent);
  font-weight: 700;
  font-size: 0.85rem;
  padding: 0 2px 0 6px;
  line-height: 1;
  user-select: none;
}

.formula-total {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-top: 4px;
  padding: 10px 12px;
  background: linear-gradient(135deg, var(--tc-primary) 0%, var(--tc-primary-dark) 100%);
  color: #fff;
  border-radius: 9px;
  font-weight: 700;
  font-size: 1.05rem;
  box-shadow: 0 3px 12px rgba(91, 106, 191, 0.28);
}

.formula-total-label {
  font-size: 0.68rem;
  font-weight: 500;
  opacity: 0.92;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.formula-meta {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px dashed var(--tc-border);
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 0.78rem;
  color: var(--tc-text-muted);
}

.formula-meta strong {
  color: var(--tc-text);
  font-variant-numeric: tabular-nums;
}

.formula-note {
  margin-top: 10px;
  font-size: 0.72rem;
  color: var(--tc-text-muted);
  line-height: 1.4;
}

@keyframes term-in {
  from {
    opacity: 0;
    transform: translateX(6px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* Help / about */
.about-panel {
  margin-top: 14px;
  padding: 14px 16px;
  background: var(--tc-surface-soft);
  border: 1px solid var(--tc-border);
  border-radius: var(--tc-radius);
}

.about-panel h3 {
  color: var(--tc-primary-dark);
  font-size: 0.92rem;
  margin-bottom: 6px;
}

.about-panel p {
  font-size: 0.82rem;
  color: var(--tc-text-muted);
  margin-bottom: 6px;
}

.about-panel p:last-child {
  margin-bottom: 0;
}

.about-panel a {
  color: var(--tc-primary-dark);
  font-weight: 600;
}

.footer-note {
  margin: 16px 0 6px;
  font-size: 0.8rem;
  color: var(--tc-text-muted);
  text-align: center;
  line-height: 1.45;
}

.site-footer {
  text-align: center;
  padding: 12px 0 6px;
  font-size: 0.85rem;
  color: var(--tc-text-muted);
}

.site-footer a {
  color: var(--tc-primary-dark);
  text-decoration: none;
  font-weight: 600;
}

.site-footer a:hover {
  text-decoration: underline;
}

/* Narrower screens: keep list + total side-by-side; only shrink columns */
@media (max-width: 980px) {
  :root {
    --tc-formula-width: 240px;
  }

  .year-sidebar {
    width: 100px;
  }
}

@media (max-width: 720px) {
  :root {
    --tc-formula-width: 200px;
  }

  .calculator-layout {
    flex-direction: column;
  }

  .year-sidebar {
    width: 100%;
  }

  .year-list {
    flex-direction: row;
    flex-wrap: wrap;
  }

  .year-button {
    flex: 1 1 90px;
    min-width: 80px;
  }

  .header h1 {
    font-size: 1.55rem;
  }

  .workspace {
    /* Still side-by-side */
    flex-wrap: nowrap;
    gap: 10px;
  }

  .formula-panel {
    flex: 0 0 var(--tc-formula-width);
    width: var(--tc-formula-width);
  }

  .credit-row.is-indent {
    padding-left: 24px;
  }

  .credit-row.is-indent-2 {
    padding-left: 34px;
  }

  .list-actions {
    width: 100%;
  }

  .list-actions .btn-ghost {
    flex: 1;
    text-align: center;
  }

  .formula-term .term-name {
    max-width: 90px;
  }
}

@media (max-width: 520px) {
  :root {
    --tc-formula-width: 160px;
  }

  .credit-label {
    font-size: 0.75rem;
  }

  .formula-panel-header h2 {
    font-size: 0.85rem;
  }

  .formula-note {
    display: none;
  }
}