/* Mobile-first compound interest calculator – Mercer Funding Group */

:root {
  --color-bg: #f5f5f5;
  --color-card: #fff;
  --color-border: #e0e0e0;
  --color-card-border: #b8c2cc;
  --color-input-border: #94a3b8;
  --color-input-bg: #fbfcff;
  --color-text: #1a1a1a;
  --color-text-muted: #555;
  --color-accent: #1a365d;
  --color-accent-hover: #2c5282;
  --color-summary-bg: #f0f4f8;
  --color-table-stripe: #f8f9fa;
  --font-sans: system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  --space: 1rem;
  --space-sm: 0.5rem;
  --space-lg: 1.5rem;
  --radius: 8px;
  --touch-min: 44px;
  --max-width: 720px;
}

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

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.5;
  color: var(--color-text);
  background: var(--color-bg);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

/* Header – white background, logo left, title + subtitle centre, Help + ? icon right; tall and spacious */
.site-header {
  background: #fff;
  border-bottom: 1px solid var(--color-border);
  padding: 1.75rem var(--space-lg);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1.5rem;
}

.logo-link {
  display: inline-block;
  flex-shrink: 0;
  min-height: var(--touch-min);
  min-width: var(--touch-min);
}

.logo {
  display: block;
  max-height: 72px;
  width: auto;
  object-fit: contain;
}

.header-titles {
  flex: 1;
  min-width: 0;
}

.page-title {
  margin: 0;
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.2;
}

.page-subtitle {
  margin: 0.5rem 0 0;
  font-size: 1rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

.header-help {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.25rem 0;
  font: inherit;
  font-size: 0.875rem;
  color: var(--color-text-muted);
  background: none;
  border: none;
  cursor: pointer;
  flex-shrink: 0;
}

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

.header-help-text {
  font-size: 0.875rem;
}

.header-help-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.25rem;
  height: 1.25rem;
  border-radius: 50%;
  background: var(--color-accent);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 700;
  line-height: 1;
}

/* Main content */
.main-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space);
  padding-bottom: var(--space-lg);
}

/* Two-column layout: narrow input card left, wider results card right (like reference) */
.calculator-layout {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.calculator-inputs {
  flex: 0 1 auto;
}

.calculator-results {
  flex: 1 1 auto;
  min-width: 0;
}

.results-panel {
  margin-bottom: 0;
  display: flex;
  flex-direction: column;
}

@media (min-width: 1024px) {
  .calculator-layout {
    flex-direction: row;
    align-items: flex-start;
    gap: var(--space-lg);
  }

  .calculator-inputs {
    flex: 0 0 460px;
    max-width: 460px;
    position: sticky;
    top: var(--space);
  }

  .calculator-results {
    flex: 1 1 0;
    min-width: 0;
    display: flex;
  }

  .results-panel {
    flex: 0 1 auto;
    width: 100%;
  }
}

/* Cards */
.card {
  background: var(--color-card);
  border: 2px solid var(--color-card-border);
  border-radius: var(--radius);
  padding: var(--space-lg);
  margin-bottom: var(--space-lg);
}

.calculator-results .card:last-child {
  margin-bottom: 0;
}

.results-panel .help-content {
  margin-bottom: var(--space-lg);
}

.section-heading {
  margin: 0 0 var(--space);
  font-size: 1.125rem;
  font-weight: 600;
}

/* Help */
.btn-help {
  position: absolute;
  top: var(--space-lg);
  right: var(--space-lg);
  min-height: var(--touch-min);
  min-width: var(--touch-min);
  padding: 0 var(--space);
  font-size: 0.875rem;
  color: var(--color-accent);
  background: transparent;
  border: 1px solid var(--color-accent);
  border-radius: var(--radius);
  cursor: pointer;
}

.btn-help:hover,
.btn-help:focus {
  background: var(--color-summary-bg);
}

.inputs-card {
  position: relative;
}

.progressive-options {
  margin-bottom: var(--space-lg);
  padding: var(--space);
  border-radius: var(--radius);
  background: var(--color-summary-bg);
}

.fully-drawn-options {
  margin-bottom: var(--space-lg);
}

.fully-drawn-options.hidden {
  display: none;
}

.progressive-options-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
}

.progressive-options-row .input-group {
  margin-bottom: 0;
  min-width: 0;
}

.progressive-options-row .input-wrap {
  max-width: none;
}

@media (max-width: 480px) {
  .progressive-options-row {
    grid-template-columns: 1fr;
  }
  .progressive-options-row .input-wrap {
    max-width: none;
  }
}

.toggle-label {
  display: block;
  font-weight: 500;
  margin-bottom: var(--space-sm);
}

.facility-type-toggle {
  display: flex;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  min-height: var(--touch-min);
}

.facility-type-toggle input[type="radio"] {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

.facility-type-toggle label {
  flex: 1;
  margin: 0;
  padding: var(--space-sm) var(--space);
  font-size: 0.9375rem;
  font-weight: 500;
  text-align: center;
  cursor: pointer;
  background: var(--color-card);
  color: var(--color-text-muted);
  border-right: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: var(--touch-min);
  transition: background 0.15s ease, color 0.15s ease;
}

.facility-type-toggle label:last-of-type {
  border-right: none;
}

.facility-type-toggle input[type="radio"]:checked + label,
.facility-type-toggle input[type="radio"]:focus-visible + label {
  background: var(--color-accent);
  color: #fff;
}

.facility-type-toggle input[type="radio"]:focus-visible + label {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.help-content {
  margin-top: var(--space);
}

.help-list {
  margin: 0;
}

.help-list dt {
  font-weight: 600;
  margin-top: var(--space);
  margin-bottom: var(--space-sm);
}

.help-list dt:first-child {
  margin-top: 0;
}

.help-list dd {
  margin: 0;
  color: var(--color-text-muted);
  font-size: 0.9375rem;
}

/* Form */
.inputs-form {
  display: flex;
  flex-direction: column;
  gap: var(--space);
}

.amount-term-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space);
}

.amount-term-row .input-group {
  margin-bottom: 0;
  min-width: 0;
}

.amount-term-row .input-wrap {
  max-width: none;
}

@media (max-width: 480px) {
  .amount-term-row {
    grid-template-columns: 1fr;
  }
}

.rate-fee-fields {
  display: flex;
  flex-direction: column;
  gap: var(--space);
}

.rate-fee-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
}

.rate-fee-row .input-group {
  margin-bottom: 0;
  min-width: 0;
}

.rate-fee-row .input-wrap {
  max-width: none;
}

@media (max-width: 480px) {
  .rate-fee-row {
    grid-template-columns: 1fr;
  }
  .rate-fee-row .input-wrap {
    max-width: none;
  }
}

.fee-actions-row {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: flex-end;
  column-gap: var(--space);
  row-gap: var(--space-sm);
}

.fee-actions-row .fee-input-group {
  max-width: 120px;
}

.fee-actions-row .actions {
  display: flex;
  justify-content: flex-end;
  margin-top: 0;
}

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

  .fee-actions-row .actions {
    justify-content: flex-start;
  }
}

.input-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.input-group label {
  font-weight: 500;
  font-size: 0.9375rem;
}

.label-with-tooltip {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.tooltip-wrap {
  position: relative;
  display: inline-flex;
}

.tooltip-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.1rem;
  height: 1.1rem;
  padding: 0;
  border: none;
  border-radius: 50%;
  background: var(--color-text-muted);
  color: #fff;
  font-size: 0.7rem;
  font-weight: 600;
  line-height: 1;
  cursor: help;
}

.tooltip-icon:hover {
  background: var(--color-accent);
}

.tooltip-icon:focus {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.tooltip-popover {
  position: absolute;
  left: 50%;
  bottom: calc(100% + 0.5rem);
  transform: translateX(-50%);
  width: 16em;
  max-width: 90vw;
  padding: var(--space-sm) var(--space);
  font-size: 0.8125rem;
  font-weight: 400;
  line-height: 1.4;
  color: var(--color-card);
  background: var(--color-text);
  border-radius: var(--radius);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  z-index: 10;
  white-space: normal;
}

.tooltip-popover::after {
  content: '';
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  border: 6px solid transparent;
  border-top-color: var(--color-text);
}

.tooltip-wrap.open .tooltip-popover {
  display: block;
}

.tooltip-popover[hidden] {
  display: none !important;
}

.input-wrap {
  display: flex;
  align-items: center;
  border: 1px solid var(--color-input-border);
  border-radius: var(--radius);
  background: var(--color-input-bg);
}

.input-wrap .prefix,
.input-wrap .suffix {
  padding: 0 var(--space);
  color: var(--color-text-muted);
  font-size: 0.9375rem;
}

.input-wrap input,
.input-group input[type="number"],
.input-group select {
  flex: 1;
  min-width: 0;
  min-height: var(--touch-min);
  padding: var(--space-sm) var(--space);
  font: inherit;
  font-size: 1rem;
  border: none;
  border-radius: var(--radius);
}

.input-wrap.input-currency input {
  border-radius: 0 var(--radius) var(--radius) 0;
}

.input-wrap:focus-within {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* Bare number input (e.g. facility term) – not inside .input-wrap */
.input-group > input[type="number"] {
  border: 1px solid var(--color-input-border);
  background: var(--color-input-bg);
}

.input-group select {
  border: 1px solid var(--color-input-border);
  background: var(--color-input-bg);
  cursor: pointer;
}

.hint {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space);
  margin-top: var(--space-sm);
}

.btn {
  min-height: var(--touch-min);
  min-width: var(--touch-min);
  padding: var(--space-sm) var(--space-lg);
  font: inherit;
  font-size: 1rem;
  font-weight: 500;
  border-radius: var(--radius);
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: none;
}

.btn-primary {
  background: #ea580c;
  color: #fff;
}

.btn-primary:hover,
.btn-primary:focus {
  background: #c2410c;
}

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

.btn-secondary:hover,
.btn-secondary:focus {
  background: var(--color-table-stripe);
}

/* Results panel: one card for right side */
.results-section {
  display: flex;
  flex-direction: column;
  flex: 0 1 auto;
  min-width: 0;
}

.calculation-title {
  margin: 0 0 var(--space);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-text);
}

.progressive-summary {
  margin: 0 0 var(--space);
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

/* Hero summary: large coloured figures like reference (green, orange, blue) */
.summary-hero {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
  margin-bottom: var(--space-lg);
}

@media (min-width: 640px) {
  .summary-hero {
    grid-template-columns: repeat(3, 1fr);
  }
}

.summary-hero-item {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.summary-hero-label {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.summary-hero-value {
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1.2;
}

.summary-hero-facility .summary-hero-value { color: #0d9488; }
.summary-hero-interest .summary-hero-value  { color: #ea580c; }
.summary-hero-balance .summary-hero-value   { color: #2563eb; }

.summary-extra {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
  margin-bottom: var(--space-lg);
}

@media (min-width: 640px) {
  .summary-extra {
    grid-template-columns: repeat(3, 1fr);
  }
}

.summary-item {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.summary-label {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.summary-value {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-accent);
}

/* Stacked bar chart: principal vs total interest */
.stacked-bar-chart {
  margin-bottom: var(--space-lg);
}

.stacked-bar-chart[aria-hidden="true"] {
  display: none;
}

.chart-title {
  margin: 0 0 var(--space-sm);
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-text);
}

.chart-bar-wrap {
  display: flex;
  width: 100%;
  height: 2rem;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--color-table-stripe);
}

.chart-segment {
  transition: width 0.3s ease;
  min-width: 0;
}

.chart-principal {
  background: #2563eb;
}

.chart-interest {
  background: #ea580c;
}

.chart-legend {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-lg);
  margin-top: var(--space-sm);
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.chart-legend-item {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.chart-legend-swatch {
  width: 0.75rem;
  height: 0.75rem;
  border-radius: 2px;
}

/* Breakdown tabs (Monthly / Yearly) – orange active like reference; height fits content when empty */
.breakdown-tabs {
  margin-top: var(--space);
  padding-top: var(--space);
  border-top: 1px solid var(--color-border);
  flex: 0 1 auto;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.tabs-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space);
  margin-bottom: var(--space);
}

.tabs-group {
  display: flex;
  gap: 0;
}

.export-buttons {
  display: flex;
  gap: var(--space-sm);
}

.btn-export {
  padding: var(--space-sm) var(--space);
  font-size: 0.875rem;
  background: var(--color-card);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn-export:hover,
.btn-export:focus {
  background: var(--color-table-stripe);
}

.tab-btn {
  margin: 0;
  padding: var(--space-sm) var(--space-lg);
  font: inherit;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text-muted);
  background: var(--color-table-stripe);
  border: 1px solid var(--color-border);
  border-right-width: 0;
  cursor: pointer;
  min-height: var(--touch-min);
}

.tab-btn:last-child {
  border-right-width: 1px;
}

.tab-btn:hover {
  color: var(--color-text);
  background: #e5e7eb;
}

.tab-btn.active {
  color: #fff;
  background: #ea580c;
  border-color: #ea580c;
}

.tab-btn:focus-visible {
  outline: 2px solid #ea580c;
  outline-offset: 2px;
}

.tab-panel {
  display: block;
  flex: 0 0 auto;
}

.tab-panel.hidden {
  display: none;
}

.table-heading {
  margin: 0 0 var(--space);
  font-size: 1rem;
  font-weight: 600;
}

.scroll-hint {
  margin: 0 0 var(--space-sm);
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

.table-scroll {
  overflow: visible;
  width: 100%;
}

.breakdown-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
  table-layout: fixed;
}

.breakdown-table th,
.breakdown-table td {
  padding: var(--space-sm) var(--space);
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

.breakdown-table th {
  font-weight: 600;
  background: var(--color-table-stripe);
}

.breakdown-table th:first-child,
.breakdown-table td:first-child {
  position: sticky;
  left: 0;
  background: var(--color-card);
  z-index: 1;
}

.breakdown-table th:first-child {
  background: var(--color-table-stripe);
}

.breakdown-table tbody tr:nth-child(even) td {
  background: var(--color-table-stripe);
}

.breakdown-table tbody tr:nth-child(even) td:first-child {
  background: var(--color-table-stripe);
}

.breakdown-table td {
  word-break: break-word;
}

@media (max-width: 640px) {
  .table-scroll {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  .breakdown-table {
    min-width: 480px;
    table-layout: auto;
  }

  .breakdown-table th,
  .breakdown-table td {
    white-space: nowrap;
    word-break: normal;
  }
}

/* Footer */
.site-footer {
  background: var(--color-card);
  border-top: 1px solid var(--color-border);
  padding: var(--space-lg) var(--space);
  margin-top: var(--space-lg);
}

.disclaimer {
  margin: 2.5rem auto var(--space-lg);
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  max-width: var(--max-width);
}

.footer-ctas {
  display: flex;
  justify-content: center;
}

.footer-ctas .btn {
  width: auto;
}

.btn-footer-primary,
.btn-footer-secondary {
  border-radius: 999px;
  padding-inline: 2.5rem;
}

.btn-footer-primary {
  background: #000;
  color: #fff;
}

.btn-footer-primary:hover,
.btn-footer-primary:focus {
  background: #111827;
}

.btn-footer-secondary {
  background: transparent;
  color: #111827;
  border: 1px solid #d1d5db;
}

.btn-footer-secondary:hover,
.btn-footer-secondary:focus {
  background: #f3f4f6;
}

.footer-cta-card {
  max-width: 720px;
  width: 100%;
  margin: 0 auto;
  padding: var(--space-lg);
  background: #f3f4f6;
  border-radius: var(--radius);
  text-align: center;
}

.footer-cta-heading {
  margin: 0 0 var(--space-sm);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0.03em;
}

.footer-cta-subtitle {
  margin: 0 0 var(--space);
  font-size: 0.9375rem;
  color: var(--color-text-muted);
}

.footer-cta-main-btn {
  margin-bottom: var(--space-sm);
}

.footer-cta-or {
  margin: 0 0 var(--space-sm);
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.footer-cta-form {
  max-width: 480px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.footer-cta-input-row {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.footer-cta-input-row input,
.footer-cta-input-full {
  width: 100%;
  padding: var(--space-sm) var(--space);
  border-radius: 999px;
  border: 1px solid var(--color-input-border);
  font: inherit;
  font-size: 0.9375rem;
}

.footer-cta-submit {
  margin-top: var(--space-sm);
}

@media (min-width: 640px) {
  .footer-cta-input-row {
    flex-direction: row;
  }
}

/* Desktop: summary in a row, larger touch not needed for mouse */
@media (min-width: 640px) {
  .main-content {
    padding: var(--space-lg);
  }

  .summary-grid {
    flex-direction: row;
    flex-wrap: wrap;
    gap: var(--space-lg);
  }

  .summary-item {
    min-width: 180px;
  }

  .footer-ctas {
    flex-direction: row;
    flex-wrap: wrap;
  }

  .footer-ctas .btn {
    width: auto;
  }

  .table-scroll {
    margin: 0;
    padding: 0;
  }
}

@media (min-width: 480px) {
  .actions {
    flex-wrap: nowrap;
  }
}