/* PAYE Calculator Kenya - Static-First Design System */
:root {
  --bg: #FFFFFF;
  --surface: #F4F7F5;
  --text: #14201C;
  --text-muted: #46564F;
  --primary: #0B5C48;
  --primary-hover: #084737;
  --on-primary: #FFFFFF;
  --focus: #1D4ED8;
  --border: #D5DDD9;
  --input-border: #6B7B74;
  --warn-bg: #FFF4D6;
  --warn-text: #5C3D00;
  --error-bg: #FDECEC;
  --error-text: #8A1F1F;
  --card-bg: #FFFFFF;
  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0E1512;
    --surface: #17211D;
    --text: #E8F0EC;
    --text-muted: #A9B8B1;
    --primary: #5FD3AE;
    --primary-hover: #7be1c1;
    --on-primary: #06241B;
    --focus: #7DB2FF;
    --border: #2B3A34;
    --input-border: #7C8D86;
    --warn-bg: #3A2A00;
    --warn-text: #FFE2A0;
    --error-bg: #3B1414;
    --error-text: #FFB4B4;
    --card-bg: #131D18;
  }
}

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

html {
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.6;
  color: var(--text);
  background-color: var(--bg);
  -webkit-text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Accessibility Skip Link */
.skip-link {
  position: absolute;
  top: -999px;
  left: 1rem;
  background: var(--primary);
  color: var(--on-primary);
  padding: 0.5rem 1rem;
  font-weight: 700;
  border-radius: 4px;
  z-index: 9999;
  text-decoration: none;
}
.skip-link:focus {
  top: 1rem;
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

a {
  color: var(--primary);
  text-underline-offset: 3px;
}
a:hover {
  text-decoration: underline;
}

.container {
  width: 100%;
  max-width: 72rem;
  margin-inline: auto;
  padding-inline: 1rem;
}

.content-col {
  max-width: 72ch;
}

/* Header & Navigation */
header.site-header {
  background-color: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: 0.75rem;
}
.brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--text);
}
.brand svg {
  flex-shrink: 0;
}
.primary-nav {
  display: none;
}
.primary-nav ul {
  display: flex;
  list-style: none;
  gap: 1.25rem;
}
.primary-nav a {
  text-decoration: none;
  color: var(--text);
  font-weight: 500;
  padding: 0.35rem 0.5rem;
  border-radius: 4px;
}
.primary-nav a:hover,
.primary-nav a[aria-current="page"] {
  color: var(--primary);
  background-color: var(--card-bg);
}

/* Mobile Menu Disclosure */
.mobile-menu {
  display: block;
}
.mobile-menu summary {
  padding: 0.4rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  cursor: pointer;
  font-weight: 600;
  min-height: 44px;
  min-width: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.mobile-menu ul {
  list-style: none;
  position: absolute;
  top: 100%;
  right: 1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.5rem;
  min-width: 240px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.12);
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  z-index: 200;
}
.mobile-menu a {
  display: block;
  padding: 0.5rem 0.75rem;
  text-decoration: none;
  color: var(--text);
  border-radius: 4px;
}
.mobile-menu a:hover,
.mobile-menu a[aria-current="page"] {
  background: var(--card-bg);
  color: var(--primary);
}

@media (min-width: 768px) {
  .primary-nav {
    display: block;
  }
  .mobile-menu {
    display: none;
  }
}

/* Breadcrumbs */
.breadcrumb-nav {
  padding-block: 0.75rem;
  font-size: 0.875rem;
}
.breadcrumb-nav ol {
  display: flex;
  flex-wrap: wrap;
  list-style: none;
  gap: 0.5rem;
}
.breadcrumb-nav li + li::before {
  content: "›";
  margin-right: 0.5rem;
  color: var(--text-muted);
}
.breadcrumb-nav a {
  text-decoration: none;
  color: var(--text-muted);
}
.breadcrumb-nav a:hover {
  color: var(--primary);
  text-decoration: underline;
}
.breadcrumb-nav [aria-current="page"] {
  color: var(--text);
  font-weight: 600;
}

/* Headings & Typography */
h1 {
  font-size: clamp(1.75rem, 1.2rem + 2.4vw, 2.5rem);
  line-height: 1.2;
  margin-bottom: 0.5rem;
  color: var(--text);
  font-weight: 800;
}
h2 {
  font-size: clamp(1.35rem, 1.1rem + 1.2vw, 1.75rem);
  line-height: 1.25;
  margin-top: 2rem;
  margin-bottom: 0.75rem;
  color: var(--text);
  font-weight: 700;
}
h3 {
  font-size: 1.2rem;
  line-height: 1.3;
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
  font-weight: 600;
}
p {
  margin-bottom: 1rem;
}
ul, ol {
  margin-bottom: 1rem;
  padding-left: 1.5rem;
}
li {
  margin-bottom: 0.35rem;
}

/* Trust Strip & Badges */
.trust-strip {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 1rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  padding: 0.5rem 0.75rem;
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  margin-block: 0.75rem 1.5rem;
}

/* Callouts & Alert Boxes */
.callout {
  padding: 1rem;
  border-radius: 6px;
  margin-block: 1rem;
  border-left: 4px solid var(--primary);
  background-color: var(--surface);
}
.callout.warn {
  border-left-color: #D97706;
  background-color: var(--warn-bg);
  color: var(--warn-text);
}
.callout.warn a {
  color: var(--warn-text);
  font-weight: 700;
}
.summary-box {
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem 1.25rem;
  margin-block: 1rem 1.5rem;
}
.summary-box h3 {
  margin-top: 0;
  font-size: 1.05rem;
  color: var(--primary);
}

/* Calculator Grid */
.calc-wrapper {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin-block: 1.5rem 2.5rem;
}
@media (min-width: 840px) {
  .calc-wrapper {
    grid-template-columns: 5fr 7fr;
    align-items: start;
  }
}

.calc-card {
  background-color: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.25rem;
  box-shadow: 0 2px 8px rgba(0,0,0,0.04);
}
.calc-card h2 {
  margin-top: 0;
  font-size: 1.35rem;
}

/* Form Controls */
.form-group {
  margin-bottom: 1rem;
}
.form-group label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.35rem;
  font-size: 0.95rem;
}
.form-group .hint {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}
.input-control, select.input-control, textarea.input-control {
  width: 100%;
  min-height: 44px;
  padding: 0.5rem 0.75rem;
  font-size: 1rem;
  font-family: inherit;
  color: var(--text);
  background-color: var(--bg);
  border: 1px solid var(--input-border);
  border-radius: 4px;
  font-variant-numeric: tabular-nums;
}
.input-control:focus {
  border-color: var(--focus);
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}
.radio-group {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}
.radio-chip {
  position: relative;
}
.radio-chip input[type="radio"] {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}
.radio-chip label {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0.4rem 0.85rem;
  border: 1px solid var(--input-border);
  border-radius: 4px;
  cursor: pointer;
  font-weight: 500;
  background-color: var(--bg);
}
.radio-chip input[type="radio"]:checked + label {
  background-color: var(--primary);
  color: var(--on-primary);
  border-color: var(--primary);
}
.radio-chip input[type="radio"]:focus-visible + label {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

/* Collapsible Form Details */
details.calc-collapsible {
  margin-block: 0.75rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.5rem 0.75rem;
  background-color: var(--surface);
}
details.calc-collapsible summary {
  cursor: pointer;
  font-weight: 600;
  min-height: 40px;
  display: flex;
  align-items: center;
}
details.calc-collapsible .collapsible-body {
  padding-top: 0.75rem;
}

/* Results Card & Zero-CLS Wrapper */
.result-wrapper {
  min-height: 490px;
  background-color: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.25rem;
  box-shadow: 0 2px 8px rgba(0,0,0,0.04);
}
.net-hero {
  padding: 1rem;
  background-color: var(--surface);
  border-radius: 6px;
  text-align: center;
  margin-bottom: 1rem;
}
.net-hero .hero-label {
  font-size: 0.9rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}
.net-hero .hero-value {
  font-size: clamp(2rem, 1.5rem + 2vw, 2.75rem);
  font-weight: 800;
  color: var(--primary);
  font-variant-numeric: tabular-nums;
  margin-block: 0.25rem;
}
.net-hero .hero-sub {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Visual Stacked Bar */
.stacked-bar-container {
  margin-block: 1rem;
}
.stacked-bar {
  display: flex;
  height: 20px;
  border-radius: 4px;
  overflow: hidden;
  background-color: var(--border);
}
.stacked-segment {
  height: 100%;
  transition: width 0.2s ease-out;
}
.bar-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  margin-top: 0.5rem;
  font-size: 0.8rem;
}
.legend-item {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}
.legend-color {
  width: 12px;
  height: 12px;
  border-radius: 2px;
}

/* Tables */
.table-wrap {
  width: 100%;
  overflow-x: auto;
  margin-block: 1rem 1.5rem;
  border: 1px solid var(--border);
  border-radius: 6px;
}
.table-wrap:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
  font-variant-numeric: tabular-nums;
  text-align: left;
}
caption {
  font-weight: 700;
  font-size: 0.9rem;
  padding: 0.75rem 1rem;
  text-align: left;
  background-color: var(--surface);
  border-bottom: 1px solid var(--border);
}
th, td {
  padding: 0.65rem 0.85rem;
  border-bottom: 1px solid var(--border);
}
th {
  background-color: var(--surface);
  font-weight: 600;
  white-space: nowrap;
}
tr:last-child td {
  border-bottom: none;
}
tr.total-row td {
  font-weight: 700;
  background-color: var(--surface);
}
.num {
  text-align: right;
}

/* Buttons */
.btn-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-block: 1rem;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0.5rem 1rem;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: 4px;
  cursor: pointer;
  text-decoration: none;
  background-color: var(--primary);
  color: var(--on-primary);
  border: 1px solid transparent;
}
.btn:hover {
  background-color: var(--primary-hover);
  text-decoration: none;
}
.btn-secondary {
  background-color: transparent;
  color: var(--text);
  border-color: var(--input-border);
}
.btn-secondary:hover {
  background-color: var(--surface);
  border-color: var(--text);
}

/* FAQ Accordion */
.faq-section {
  margin-block: 2.5rem;
}
details.faq-item {
  border: 1px solid var(--border);
  border-radius: 6px;
  margin-bottom: 0.5rem;
  background-color: var(--card-bg);
}
details.faq-item summary {
  padding: 0.85rem 1rem;
  font-weight: 600;
  cursor: pointer;
  min-height: 44px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
details.faq-item[open] summary {
  border-bottom: 1px solid var(--border);
}
.faq-answer {
  padding: 1rem;
  font-size: 0.95rem;
}

/* Related Content & Cards Grid */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1rem;
  margin-block: 1rem 2rem;
}
.card {
  background-color: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.25rem;
  text-decoration: none;
  color: var(--text);
  display: flex;
  flex-direction: column;
}
.card:hover {
  border-color: var(--primary);
  text-decoration: none;
  box-shadow: 0 4px 12px rgba(0,0,0,0.06);
}
.card h3 {
  margin-top: 0;
  color: var(--primary);
}
.card p {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 0;
}

/* Partner Block */
.partner-block {
  border: 1px dashed var(--input-border);
  border-radius: 8px;
  padding: 1.25rem;
  margin-block: 1.5rem;
  background-color: var(--surface);
}
.partner-tag {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

/* Disclaimer & Footer */
.disclaimer-box {
  font-size: 0.825rem;
  color: var(--text-muted);
  padding: 0.75rem;
  background-color: var(--surface);
  border-radius: 6px;
  margin-block: 1rem;
}
footer.site-footer {
  margin-top: auto;
  background-color: var(--surface);
  border-top: 1px solid var(--border);
  padding-block: 3rem 1.5rem;
  font-size: 0.9rem;
}
.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 2rem;
  margin-bottom: 2rem;
}
.footer-col h4,
.footer-col .footer-heading {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  color: var(--text);
}
.footer-col ul {
  list-style: none;
  padding: 0;
}
.footer-col li {
  margin-bottom: 0.5rem;
}
.footer-col a {
  text-decoration: none;
  color: var(--text-muted);
}
.footer-col a:hover {
  color: var(--primary);
  text-decoration: underline;
}
.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 1.5rem;
  font-size: 0.8rem;
  color: var(--text-muted);
  text-align: center;
}

/* Print Stylesheet */
@media print {
  header, footer, .calc-card, .btn-group, .breadcrumb-nav, .mobile-menu, .faq-section, .cards-grid, .skip-link {
    display: none !important;
  }
  body, .container {
    background: #FFFFFF !important;
    color: #000000 !important;
    max-width: 100% !important;
    padding: 0 !important;
    margin: 0 !important;
  }
  .result-wrapper {
    box-shadow: none !important;
    border: none !important;
    padding: 0 !important;
    min-height: auto !important;
  }
  table {
    border: 1px solid #000000 !important;
  }
  th, td {
    border-bottom: 1px solid #000000 !important;
    color: #000000 !important;
  }
  .net-hero {
    background: none !important;
    border: 2px solid #000000 !important;
  }
  .net-hero .hero-value {
    color: #000000 !important;
  }
}