/* ========================================
   Global Stylesheet - WageToSalary
   Inspired by Stripe Design System (DESIGN.md)
   - System fonts only (no commercial fonts)
   - Borders instead of shadows
   - No gradients
   - Mobile-first, fully responsive
   ======================================== */

/* --- Design tokens --- */
:root {
  /* Brand colors */
  --color-primary: #533afd;
  --color-primary-hover: #4434d4;
  --color-primary-deep: #2e2b8c;
  --color-primary-soft: #b9b9f9;
  --color-primary-tint: #d6d9fc;

  /* Surface */
  --color-bg: #ffffff;
  --color-bg-subtle: #f6f9fc;
  --color-bg-muted: #f1f5f9;
  --color-brand-dark: #1c1e54;
  --color-dark-navy: #0d253d;

  /* Text — WCAG AA on white (≥4.5:1 body, ≥7:1 labels) */
  --color-heading: #061b31;
  --color-label: #1e293b;
  --color-body: #475569;
  --color-muted: #64748b;

  /* Status */
  --color-success: #15be53;
  --color-success-text: #108c3d;
  --color-success-soft: rgba(21,190,83,0.2);
  --color-success-border: rgba(21,190,83,0.4);
  --color-info-text: #2874ad;
  --color-info-border: rgba(43,145,223,0.2);
  --color-warning: #9b6829;

  /* Borders */
  --border-default: #e5edf5;
  --border-strong: #d4dee9;

  /* Spacing scale (8px base, 4-12 dense end) */
  --sp-1: 4px;
  --sp-2: 8px;
  --sp-3: 12px;
  --sp-sm: 16px;
  --sp-md: 24px;
  --sp-lg: 32px;
  --sp-xl: 48px;
  --sp-2xl: 64px;

  /* Radius scale (4-8px conservative) */
  --r-sm: 4px;
  --r-md: 5px;
  --r-lg: 6px;
  --r-xl: 8px;

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI Variable", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", "SF Mono", Menlo, Consolas, monospace;
  --feat-text: "ss01";
  --feat-tnum: "tnum";

  /* Layout */
  --max-width: 1080px;
  --header-height: 64px;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-feature-settings: var(--feat-text);
  font-weight: 300;
  font-size: 1rem;
  line-height: 1.5;
  color: var(--color-body);
  background: var(--color-bg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  max-width: 100vw;
}

img, svg, video, iframe {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .15s ease, border-color .15s ease;
}
a:hover {
  color: var(--color-primary-hover);
  border-bottom-color: currentColor;
}

ul, ol {
  list-style: none;
}

input, select, button, textarea {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
  font-feature-settings: var(--feat-text);
}

button {
  cursor: pointer;
  border: none;
  background: none;
}

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

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

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
  color: var(--color-heading);
  font-weight: 300;
  font-feature-settings: var(--feat-text);
  line-height: 1.15;
  letter-spacing: -0.02em;
}

h1 {
  font-size: clamp(1.875rem, 4.5vw, 3rem);
  letter-spacing: -0.025em;
  line-height: 1.1;
  margin-bottom: var(--sp-sm);
}

h2 {
  font-size: clamp(1.5rem, 3.5vw, 2rem);
  letter-spacing: -0.02em;
  margin-top: var(--sp-xl);
  margin-bottom: var(--sp-sm);
  padding-bottom: var(--sp-3);
  border-bottom: 1px solid var(--border-default);
}

h3 {
  font-size: clamp(1.25rem, 2.5vw, 1.375rem);
  letter-spacing: -0.015em;
  margin-top: var(--sp-md);
  margin-bottom: var(--sp-3);
  font-weight: 400;
}

h4 {
  font-size: 1.125rem;
  font-weight: 400;
  letter-spacing: -0.01em;
  margin-bottom: var(--sp-3);
}

p {
  margin-bottom: var(--sp-sm);
  color: var(--color-body);
  line-height: 1.65;
}

strong, b {
  font-weight: 500;
  color: var(--color-heading);
}

/* Lead paragraph (BLUF intro) */
.article-lead {
  font-size: 1.125rem;
  line-height: 1.55;
  color: var(--color-label);
  margin-bottom: var(--sp-md);
}

/* --- Layout --- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--sp-sm);
}

main {
  flex: 1;
  padding: var(--sp-md) 0 var(--sp-2xl);
}

.content-section {
  margin-bottom: var(--sp-xl);
}

/* --- Reading progress bar --- */
.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 3px;
  background: var(--color-primary);
  z-index: 1100;
  transition: width .1s linear;
  will-change: width;
}

/* --- Skip nav --- */
.skip-nav {
  position: absolute;
  left: -9999px;
  top: var(--sp-2);
  background: var(--color-primary);
  color: #fff;
  padding: var(--sp-2) var(--sp-3);
  border-radius: var(--r-sm);
  z-index: 9999;
}
.skip-nav:focus {
  left: var(--sp-2);
}

/* --- Breadcrumb --- */
.breadcrumb {
  padding: var(--sp-3) 0;
  font-size: 0.875rem;
  color: var(--color-body);
}
.breadcrumb a {
  color: var(--color-body);
}
.breadcrumb a:hover {
  color: var(--color-primary);
}
.breadcrumb span {
  margin: 0 var(--sp-2);
  color: var(--color-muted);
}
.breadcrumb-current {
  color: var(--color-label);
}

/* --- Header --- */
.site-header {
  background: var(--color-bg);
  border-bottom: 1px solid var(--border-default);
  position: sticky;
  top: 0;
  z-index: 1000;
  height: var(--header-height);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--sp-sm);
}

.site-logo,
.site-logo:hover {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  font-size: 1rem;
  font-weight: 400;
  color: var(--color-heading);
  text-decoration: none;
  border: none;
  white-space: nowrap;
}
.site-logo:hover {
  color: var(--color-primary);
}
.site-logo svg {
  width: 28px;
  height: 28px;
  flex-shrink: 0;
}

/* Navigation */
.nav-menu {
  display: none;
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--color-bg);
  padding: var(--sp-sm);
  overflow-y: auto;
  z-index: 999;
  border-top: 1px solid var(--border-default);
}
.nav-menu.active {
  display: block;
}
.nav-menu > ul {
  display: flex;
  flex-direction: column;
  gap: var(--sp-1);
}

.nav-menu a {
  display: block;
  padding: var(--sp-3) var(--sp-sm);
  color: var(--color-label);
  border-radius: var(--r-lg);
  font-size: 0.9375rem;
  font-weight: 400;
  text-decoration: none;
  border: none;
  transition: background-color .15s ease, color .15s ease;
  min-height: 48px;
  display: flex;
  align-items: center;
}

.nav-menu a:hover,
.nav-menu a.active {
  background: var(--color-bg-subtle);
  color: var(--color-primary);
}

/* Dropdown */
.nav-dropdown {
  position: relative;
}
.nav-dropdown-toggle {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  width: 100%;
  padding: var(--sp-3) var(--sp-sm);
  color: var(--color-label);
  border-radius: var(--r-lg);
  font-size: 0.9375rem;
  font-weight: 400;
  text-align: left;
  cursor: pointer;
  font-feature-settings: var(--feat-text);
  min-height: 48px;
  transition: background-color .15s ease, color .15s ease;
}
.nav-dropdown-toggle:hover,
.nav-dropdown.has-active > .nav-dropdown-toggle {
  background: var(--color-bg-subtle);
  color: var(--color-primary);
}
.nav-chevron {
  width: 10px;
  height: 10px;
  flex-shrink: 0;
  transition: transform .2s ease;
}
.nav-dropdown.open > .nav-dropdown-toggle .nav-chevron {
  transform: rotate(180deg);
}

.nav-dropdown-menu {
  display: none;
  padding-left: var(--sp-3);
  border-left: 1px solid var(--color-primary-soft);
  margin-left: var(--sp-sm);
  margin-top: var(--sp-1);
}
.nav-dropdown.open > .nav-dropdown-menu {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.nav-dropdown-menu a {
  font-size: 0.875rem;
  padding: var(--sp-2) var(--sp-3);
  min-height: 40px;
}

/* Hamburger */
.menu-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: var(--r-lg);
  border: 1px solid transparent;
  transition: background-color .15s ease, border-color .15s ease;
}
.menu-toggle:hover {
  background: var(--color-bg-subtle);
  border-color: var(--border-default);
}
.menu-toggle svg {
  width: 22px;
  height: 22px;
  color: var(--color-heading);
}

/* --- Footer --- */
.site-footer {
  background: var(--color-brand-dark);
  color: rgba(255,255,255,0.7);
  padding: var(--sp-2xl) 0 var(--sp-md);
  margin-top: auto;
  font-feature-settings: var(--feat-text);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-lg);
  margin-bottom: var(--sp-lg);
}

.footer-col h4 {
  color: #ffffff;
  font-size: 0.9375rem;
  font-weight: 400;
  margin-bottom: var(--sp-sm);
  letter-spacing: -0.01em;
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
}

.footer-col a {
  color: rgba(255,255,255,0.65);
  font-size: 0.875rem;
  font-weight: 300;
  text-decoration: none;
  border: none;
  transition: color .15s ease;
}
.footer-col a:hover {
  color: #ffffff;
  border: none;
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.12);
  padding-top: var(--sp-md);
  text-align: center;
  font-size: 0.8125rem;
  color: rgba(255,255,255,0.55);
}
.footer-bottom p {
  color: inherit;
  margin: 0;
}
.footer-bottom a {
  color: rgba(255,255,255,0.85);
  border-bottom: 1px solid rgba(255,255,255,0.25);
}
.footer-bottom a:hover {
  color: #ffffff;
  border-bottom-color: #ffffff;
}

/* --- Ad slots --- */
.ad-container {
  margin: var(--sp-md) 0;
  text-align: center;
  min-height: 0;
  overflow: hidden;
}
.ad-container:empty {
  display: none;
}
.ad-container .adsbygoogle[data-ad-status="unfilled"] {
  display: none !important;
}

/* --- Related calculators --- */
.related-calculators {
  margin-top: var(--sp-xl);
  padding-top: var(--sp-md);
  border-top: 1px solid var(--border-default);
}
.related-calculators h2 {
  border-bottom: none;
  margin-top: 0;
  padding-bottom: 0;
}

.related-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-3);
  margin-top: var(--sp-sm);
}

.related-card {
  display: flex;
  align-items: flex-start;
  gap: var(--sp-3);
  padding: var(--sp-sm);
  background: var(--color-bg);
  border: 1px solid var(--border-default);
  border-radius: var(--r-lg);
  text-decoration: none;
  transition: border-color .15s ease;
}
.related-card,
.related-card:hover {
  text-decoration: none;
  border-bottom: 1px solid var(--border-default);
}
.related-card:hover {
  border-color: var(--color-primary-soft);
}

.related-card .card-icon {
  width: 36px;
  height: 36px;
  flex-shrink: 0;
  background: var(--color-bg-subtle);
  border: 1px solid var(--border-default);
  border-radius: var(--r-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.125rem;
}

.related-card .card-content h3 {
  font-size: 0.9375rem;
  font-weight: 400;
  margin: 0 0 var(--sp-1);
  color: var(--color-heading);
}
.related-card .card-content p {
  font-size: 0.8125rem;
  color: var(--color-body);
  margin: 0;
  line-height: 1.45;
}

/* --- Friend links --- */
.friend-links {
  margin-top: var(--sp-xl);
  padding-top: var(--sp-md);
  border-top: 1px solid var(--border-default);
}
.friend-links h2 {
  border-bottom: none;
  margin-top: 0;
  padding-bottom: 0;
}
.friend-links-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-3);
  margin-top: var(--sp-sm);
}
.friend-link-card {
  display: block;
  padding: var(--sp-sm);
  background: var(--color-bg);
  border: 1px solid var(--border-default);
  border-radius: var(--r-lg);
  text-decoration: none;
  transition: border-color .15s ease;
}
.friend-link-card:hover {
  border-color: var(--color-primary-soft);
  border-bottom: 1px solid var(--color-primary-soft);
}
.friend-link-keyword {
  display: block;
  font-size: 0.9375rem;
  font-weight: 400;
  color: var(--color-heading);
  margin-bottom: var(--sp-1);
}
.friend-link-url {
  display: block;
  font-size: 0.8125rem;
  color: var(--color-body);
  word-break: break-word;
}

/* --- Content boxes --- */
.info-box {
  background: var(--color-bg-subtle);
  border: 1px solid var(--color-primary-soft);
  border-left: 3px solid var(--color-primary);
  padding: var(--sp-sm) var(--sp-sm);
  border-radius: var(--r-sm);
  margin: var(--sp-md) 0;
}
.info-box p {
  color: var(--color-label);
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.6;
}

.warning-box {
  background: var(--color-bg-subtle);
  border: 1px solid var(--border-default);
  border-left: 3px solid var(--color-warning);
  padding: var(--sp-sm);
  border-radius: var(--r-sm);
  margin: var(--sp-md) 0;
}
.warning-box p {
  color: var(--color-label);
  margin: 0;
  font-size: 0.9375rem;
}

.success-badge {
  display: inline-block;
  background: var(--color-success-soft);
  color: var(--color-success-text);
  border: 1px solid var(--color-success-border);
  padding: 1px 6px;
  font-size: 10px;
  font-weight: 400;
  border-radius: var(--r-sm);
}

/* Formula block */
.formula-block {
  background: var(--color-bg-subtle);
  border: 1px solid var(--border-default);
  border-radius: var(--r-lg);
  padding: var(--sp-sm) var(--sp-md);
  margin: var(--sp-md) 0;
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  text-align: center;
  color: var(--color-heading);
  font-weight: 500;
  line-height: 2;
  font-feature-settings: var(--feat-tnum);
}

/* Data tables */
.data-table-wrapper {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin: var(--sp-md) 0;
  border: 1px solid var(--border-default);
  border-radius: var(--r-lg);
}

.data-table {
  width: 100%;
  font-size: 0.875rem;
  font-feature-settings: var(--feat-tnum);
}

.data-table thead {
  background: var(--color-bg-subtle);
}

.data-table th {
  padding: var(--sp-3) var(--sp-sm);
  text-align: left;
  font-weight: 400;
  color: var(--color-heading);
  border-bottom: 1px solid var(--border-default);
  white-space: nowrap;
  font-feature-settings: var(--feat-text);
}

.data-table td {
  padding: var(--sp-3) var(--sp-sm);
  border-bottom: 1px solid var(--border-default);
  color: var(--color-label);
  white-space: nowrap;
}

.data-table tbody tr:hover {
  background: var(--color-bg-subtle);
}

.data-table tbody tr:last-child td {
  border-bottom: none;
}

.data-table .highlight-row {
  background: var(--color-bg-subtle);
}
.data-table .highlight-row td {
  color: var(--color-heading);
  font-weight: 400;
}

/* FAQ */
.faq-section {
  margin-top: var(--sp-md);
}

.faq-item {
  border: 1px solid var(--border-default);
  border-radius: var(--r-lg);
  margin-bottom: var(--sp-3);
  overflow: hidden;
  background: var(--color-bg);
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: var(--sp-sm);
  background: var(--color-bg);
  font-weight: 400;
  font-size: 0.9375rem;
  text-align: left;
  color: var(--color-heading);
  cursor: pointer;
  font-feature-settings: var(--feat-text);
  gap: var(--sp-sm);
  min-height: 48px;
  border-radius: var(--r-lg);
  transition: background-color .15s ease;
}

.faq-question:hover {
  background: var(--color-bg-subtle);
}

.faq-question .faq-icon {
  flex-shrink: 0;
  width: 18px;
  height: 18px;
  color: var(--color-body);
  transition: transform .2s ease;
}

.faq-item.open .faq-question .faq-icon {
  transform: rotate(180deg);
}

.faq-answer {
  display: none;
  padding: 0 var(--sp-sm) var(--sp-sm);
  font-size: 0.9375rem;
  color: var(--color-body);
  line-height: 1.65;
  border-top: 1px solid var(--border-default);
}
.faq-answer p {
  padding-top: var(--sp-3);
}
.faq-item.open .faq-answer {
  display: block;
}
.faq-answer p:last-child {
  margin-bottom: 0;
}

/* --- Article TOC (chapter nav) --- */
.article-toc {
  background: var(--color-bg-subtle);
  border: 1px solid var(--border-default);
  border-radius: var(--r-lg);
  padding: var(--sp-sm) var(--sp-md);
  margin: var(--sp-md) 0;
}
.article-toc p {
  margin-bottom: var(--sp-2);
  font-weight: 400;
  color: var(--color-heading);
  font-size: 0.875rem;
}
.article-toc ol {
  list-style: decimal inside;
  margin: 0;
  padding: 0;
}
.article-toc li {
  padding: var(--sp-1) 0;
  font-size: 0.9375rem;
}
.article-toc a {
  color: var(--color-label);
  border: none;
}
.article-toc a:hover {
  color: var(--color-primary);
  border-bottom: 1px solid currentColor;
}

/* --- Content preview block --- */
.content-preview {
  background: var(--color-bg-subtle);
  border: 1px solid var(--border-default);
  border-radius: var(--r-lg);
  padding: var(--sp-sm) var(--sp-md);
  margin: var(--sp-md) 0;
}
.content-preview > p:first-child {
  font-weight: 400;
  color: var(--color-heading);
  margin-bottom: var(--sp-2);
}
.content-preview ul {
  list-style: none;
  margin: 0 0 var(--sp-2);
  padding: 0;
}
.content-preview li {
  padding: var(--sp-1) 0;
  color: var(--color-label);
  font-size: 0.9375rem;
}
.content-preview li::before {
  content: "✓ ";
  color: var(--color-success-text);
  font-weight: 500;
  margin-right: var(--sp-2);
}
.content-preview > p:last-child {
  font-size: 0.8125rem;
  color: var(--color-body);
  margin: 0;
}

/* Inline content hook */
.content-hook {
  background: var(--color-bg-subtle);
  border-left: 3px solid var(--color-primary);
  padding: var(--sp-3) var(--sp-sm);
  margin: var(--sp-md) 0;
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  font-size: 0.9375rem;
  color: var(--color-label);
}
.content-hook p {
  margin: 0;
  line-height: 1.6;
}

/* Section transition */
.section-transition {
  font-style: italic;
  color: var(--color-body);
  font-size: 0.9375rem;
  border-top: 1px dashed var(--border-default);
  padding-top: var(--sp-3);
  margin-top: var(--sp-md);
}

/* --- Author byline (E-E-A-T) --- */
.author-byline {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  padding: var(--sp-3) 0;
  border-top: 1px solid var(--border-default);
  border-bottom: 1px solid var(--border-default);
  margin: var(--sp-md) 0;
  font-size: 0.875rem;
  flex-wrap: wrap;
}
.author-byline .author-name {
  font-weight: 400;
  color: var(--color-heading);
  border: none;
}
.author-byline .author-expertise {
  color: var(--color-body);
}
.author-byline time {
  color: var(--color-muted);
  font-feature-settings: var(--feat-tnum);
}

/* --- Lists --- */
.content-section ul:not(.related-grid):not(.friend-links-grid):not(.faq-section ul) {
  list-style: disc;
  padding-left: var(--sp-md);
  margin-bottom: var(--sp-sm);
  color: var(--color-body);
}
.content-section ul li {
  padding: var(--sp-1) 0;
  line-height: 1.6;
}
.content-section ol {
  list-style: decimal;
  padding-left: var(--sp-md);
  margin-bottom: var(--sp-sm);
}

/* --- Utilities --- */
.text-center { text-align: center; }
.text-right { text-align: right; }
.font-mono { font-family: var(--font-mono); }
.text-sm { font-size: 0.875rem; }
.text-xs { font-size: 0.8125rem; }
.text-muted { color: var(--color-muted); }

/* ========================================
   Calculator pages — first-screen priority
   Reorder flex children: H1 → calculator → SEO meta
   ======================================== */
main.container:has(> .calculator-wrapper) {
  display: flex;
  flex-direction: column;
  padding-top: var(--sp-sm);
}

main.container:has(> .calculator-wrapper) > .breadcrumb {
  order: 0;
  padding: var(--sp-2) 0;
  font-size: 0.8125rem;
}

main.container:has(> .calculator-wrapper) > h1 {
  order: 1;
  font-size: clamp(1.25rem, 3.5vw, 1.75rem);
  line-height: 1.2;
  margin-bottom: var(--sp-2);
  letter-spacing: -0.02em;
}

main.container:has(> .calculator-wrapper) > .calculator-wrapper {
  order: 2;
  margin-top: 0;
}

main.container:has(> .calculator-wrapper) > .calculator-wrapper ~ .calculator-wrapper {
  order: 3;
  margin-top: var(--sp-sm);
}

main.container:has(> .calculator-wrapper) > .article-lead,
main.container:has(> .calculator-wrapper) > .text-sm,
main.container:has(> .calculator-wrapper) > .author-byline,
main.container:has(> .calculator-wrapper) > .fact-check-badge,
main.container:has(> .calculator-wrapper) > .content-preview,
main.container:has(> .calculator-wrapper) > .article-toc,
main.container:has(> .calculator-wrapper) > .content-hook,
main.container:has(> .calculator-wrapper) > .ad-container {
  order: 10;
}

main.container:has(> .calculator-wrapper) > .content-section,
main.container:has(> .calculator-wrapper) > section.content-section,
main.container:has(> .calculator-wrapper) > .related-calculators,
main.container:has(> .calculator-wrapper) > .related-tools,
main.container:has(> .calculator-wrapper) > .related-guides,
main.container:has(> .calculator-wrapper) > .faq-section {
  order: 20;
}
.text-body { color: var(--color-body); }
.tnum { font-feature-settings: var(--feat-tnum); }
.mt-1 { margin-top: var(--sp-2); }
.mt-2 { margin-top: var(--sp-3); }
.mt-3 { margin-top: var(--sp-sm); }
.mb-1 { margin-bottom: var(--sp-2); }
.mb-2 { margin-bottom: var(--sp-3); }
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

/* --- Tablet breakpoint --- */
@media (min-width: 768px) {
  .container {
    padding: 0 var(--sp-md);
  }
  main {
    padding: var(--sp-lg) 0 var(--sp-2xl);
  }
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .related-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .friend-links-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* --- Desktop breakpoint --- */
@media (min-width: 1024px) {
  .container {
    padding: 0 var(--sp-lg);
  }
  /* Horizontal nav */
  .menu-toggle {
    display: none;
  }
  .nav-menu {
    display: flex;
    position: static;
    background: transparent;
    padding: 0;
    overflow: visible;
    border: none;
  }
  .nav-menu > ul {
    flex-direction: row;
    align-items: center;
    gap: var(--sp-1);
  }
  .nav-menu a {
    padding: var(--sp-2) var(--sp-3);
    font-size: 0.875rem;
    white-space: nowrap;
    min-height: auto;
    border-radius: var(--r-md);
  }

  .nav-dropdown-toggle {
    padding: var(--sp-2) var(--sp-3);
    font-size: 0.875rem;
    white-space: nowrap;
    width: auto;
    min-height: auto;
    border-radius: var(--r-md);
  }

  .nav-dropdown-menu {
    display: none;
    position: absolute;
    top: calc(100% + 4px);
    left: 0;
    padding: var(--sp-2);
    margin: 0;
    border: 1px solid var(--border-default);
    border-radius: var(--r-lg);
    background: var(--color-bg);
    min-width: 220px;
    z-index: 1001;
    flex-direction: column;
  }

  .nav-dropdown-menu a {
    padding: var(--sp-2) var(--sp-3);
    font-size: 0.875rem;
    border-radius: var(--r-sm);
    min-height: auto;
  }

  .nav-dropdown:hover > .nav-dropdown-menu,
  .nav-dropdown.open > .nav-dropdown-menu {
    display: flex;
  }

  .nav-dropdown:hover > .nav-dropdown-toggle .nav-chevron,
  .nav-dropdown.open > .nav-dropdown-toggle .nav-chevron {
    transform: rotate(180deg);
  }

  .nav-dropdown:hover > .nav-dropdown-toggle {
    background: var(--color-bg-subtle);
    color: var(--color-primary);
  }

  .footer-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .related-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .friend-links-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* --- Reduced motion --- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    transition-duration: 0s !important;
    animation-duration: 0s !important;
  }
  html {
    scroll-behavior: auto;
  }
}

/* --- Print --- */
@media print {
  .site-header, .site-footer, .ad-container, .reading-progress, .related-calculators, .friend-links {
    display: none !important;
  }
  body {
    color: #000;
    background: #fff;
  }
}