/* ==========================================================================
   SearchEngines.Net — shared design system
   Modern editorial style. Palette drawn from the logo:
   red  #ad0911 (magnifying glass), gray #4a4a4a / #262626 (wordmark)
   ========================================================================== */

:root {
  --red: #ad0911;
  --red-dark: #8a070d;
  --red-tint: #fbe9ea;
  --ink: #232323;
  --gray-800: #333333;
  --gray-600: #555555;
  --gray-400: #838383;
  --gray-200: #e2e0dc;
  --gray-100: #f3f1ec;
  --paper: #fdfcfa;
  --serif: "Source Serif 4", Georgia, "Times New Roman", serif;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --max: 1120px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--sans);
  color: var(--gray-800);
  background: var(--paper);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }

a { color: var(--red); text-decoration: none; }
a:hover { text-decoration: underline; }

h1, h2, h3, h4 {
  font-family: var(--serif);
  color: var(--ink);
  line-height: 1.2;
  font-weight: 700;
  margin: 0 0 0.5em;
}

h1 { font-size: clamp(2rem, 4vw, 3rem); }
h2 { font-size: clamp(1.5rem, 2.6vw, 2.1rem); margin-top: 2.2em; }
h3 { font-size: 1.3rem; margin-top: 1.6em; }

p { margin: 0 0 1.1em; }

.container {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- Header / nav ---------- */

.site-header {
  border-bottom: 1px solid var(--gray-200);
  background: var(--paper);
  position: sticky;
  top: 0;
  z-index: 50;
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 14px;
  padding-bottom: 14px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand img { height: 52px; width: auto; }

.brand-text {
  font-family: var(--serif);
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--ink);
}

.brand-text span { color: var(--red); }

nav.main-nav ul {
  list-style: none;
  display: flex;
  gap: 28px;
  margin: 0;
  padding: 0;
}

nav.main-nav a {
  color: var(--gray-800);
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: 0.01em;
}

nav.main-nav a.active,
nav.main-nav a:hover {
  color: var(--red);
  text-decoration: none;
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}
.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--ink);
  margin: 5px 0;
}

@media (max-width: 760px) {
  .nav-toggle { display: block; }
  nav.main-nav {
    display: none;
    width: 100%;
    order: 3;
  }
  nav.main-nav.open { display: block; }
  nav.main-nav ul {
    flex-direction: column;
    gap: 0;
    padding: 12px 0;
  }
  nav.main-nav li { border-top: 1px solid var(--gray-200); }
  nav.main-nav a { display: block; padding: 12px 4px; }
  .site-header .container { flex-wrap: wrap; }
}

/* ---------- Hero ---------- */

.hero {
  padding: 64px 0 56px;
  border-bottom: 1px solid var(--gray-200);
  background:
    radial-gradient(1200px 400px at 85% -10%, var(--red-tint), transparent 60%);
}

.hero .eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--red);
  margin-bottom: 14px;
}

.hero h1 { max-width: 16ch; }

.hero p.lede {
  font-size: 1.15rem;
  color: var(--gray-600);
  max-width: 62ch;
  margin-top: 18px;
}

/* ---------- Page header (non-home pages) ---------- */

.page-header {
  padding: 48px 0 36px;
  border-bottom: 1px solid var(--gray-200);
}
.page-header .eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--red);
  margin-bottom: 10px;
}
.page-header p.lede {
  font-size: 1.08rem;
  color: var(--gray-600);
  max-width: 68ch;
}

/* ---------- Cards / entry points ---------- */

.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin: 48px 0;
}

@media (max-width: 860px) {
  .card-grid { grid-template-columns: 1fr; }
}

.card {
  background: #fff;
  border: 1px solid var(--gray-200);
  border-radius: 10px;
  padding: 28px;
  transition: box-shadow 0.15s ease, transform 0.15s ease;
}
.card:hover {
  box-shadow: 0 8px 24px rgba(0,0,0,0.06);
  transform: translateY(-2px);
}
.card .tag {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--red);
  background: var(--red-tint);
  padding: 3px 10px;
  border-radius: 999px;
  margin-bottom: 14px;
}
.card h3 { margin-top: 0; font-size: 1.2rem; }
.card p { color: var(--gray-600); font-size: 0.96rem; margin-bottom: 14px; }
.card .card-link { font-weight: 700; font-size: 0.92rem; }

/* ---------- Section / prose ---------- */

.section {
  padding: 44px 0;
}
.section + .section { border-top: 1px solid var(--gray-200); }

article.prose {
  max-width: 74ch;
}
article.prose ul, article.prose ol {
  padding-left: 1.3em;
}
article.prose li { margin-bottom: 0.5em; }

blockquote {
  border-left: 3px solid var(--red);
  margin: 1.6em 0;
  padding: 0.2em 0 0.2em 1.2em;
  color: var(--gray-600);
  font-style: italic;
}

.callout {
  background: var(--gray-100);
  border-left: 3px solid var(--red);
  padding: 18px 22px;
  border-radius: 6px;
  margin: 1.6em 0;
  font-size: 0.96rem;
}
.callout strong { color: var(--ink); }

/* ---------- Table of contents ---------- */

.toc {
  background: #fff;
  border: 1px solid var(--gray-200);
  border-radius: 10px;
  padding: 22px 26px;
  margin: 8px 0 40px;
}
.toc h2 { margin-top: 0; font-size: 1.05rem; }
.toc ol {
  columns: 2;
  column-gap: 32px;
  padding-left: 1.1em;
  margin: 0;
}
@media (max-width: 640px) { .toc ol { columns: 1; } }
.toc li { margin-bottom: 6px; }
.toc a { color: var(--gray-800); font-weight: 600; }
.toc a:hover { color: var(--red); }

/* ---------- Timeline (history page) ---------- */

.timeline-era {
  display: flex;
  gap: 10px;
  align-items: baseline;
  margin-top: 2.4em;
}
.timeline-era .era-year {
  font-family: var(--serif);
  font-weight: 700;
  color: var(--red);
  white-space: nowrap;
  font-size: 1rem;
}
.timeline-era hr {
  flex: 1;
  border: none;
  border-top: 1px dashed var(--gray-200);
}

/* ---------- Glossary ---------- */

.az-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 8px 0 36px;
  position: sticky;
  top: 70px;
  background: var(--paper);
  padding: 10px 0;
  z-index: 10;
}
.az-nav a {
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--gray-200);
  border-radius: 6px;
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--gray-800);
}
.az-nav a:hover, .az-nav a.disabled {
  text-decoration: none;
}
.az-nav a:hover { border-color: var(--red); color: var(--red); }
.az-nav a.disabled {
  color: var(--gray-400);
  pointer-events: none;
  border-color: var(--gray-100);
}

.glossary-search {
  width: 100%;
  padding: 12px 16px;
  font-size: 1rem;
  border: 1px solid var(--gray-200);
  border-radius: 8px;
  margin-bottom: 28px;
  font-family: var(--sans);
}
.glossary-search:focus { outline: 2px solid var(--red); border-color: var(--red); }

.glossary-letter {
  font-family: var(--serif);
  font-size: 1.8rem;
  color: var(--red);
  border-bottom: 2px solid var(--gray-200);
  padding-bottom: 6px;
  margin-top: 2em;
}

.glossary-entry { margin-top: 1.3em; }
.glossary-entry .term-name {
  font-weight: 700;
  color: var(--ink);
  font-size: 1.05rem;
  margin: 0 0 0.3em;
  font-family: var(--sans);
}
.glossary-entry .term-def {
  margin: 0;
  color: var(--gray-600);
  max-width: 68ch;
}
.glossary-entry .why { color: var(--gray-800); }
.glossary-entry .why strong { color: var(--red); }

.no-results { display: none; color: var(--gray-400); font-style: italic; padding: 20px 0; }

/* ---------- Directory ---------- */

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 8px 0 32px;
}
.filter-btn {
  border: 1px solid var(--gray-200);
  background: #fff;
  color: var(--gray-800);
  padding: 8px 16px;
  border-radius: 999px;
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  font-family: var(--sans);
}
.filter-btn:hover { border-color: var(--red); color: var(--red); }
.filter-btn.active { background: var(--red); border-color: var(--red); color: #fff; }

.directory-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
}
@media (max-width: 700px) { .directory-grid { grid-template-columns: 1fr; } }

.engine-card {
  border: 1px solid var(--gray-200);
  border-radius: 10px;
  padding: 20px 22px;
  background: #fff;
}
.engine-card .engine-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}
.engine-card h3 { margin: 0; font-size: 1.08rem; }
.engine-card h3 a { color: var(--ink); }
.engine-card h3 a:hover { color: var(--red); }
.engine-card .cat-tag {
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--gray-600);
  background: var(--gray-100);
  padding: 3px 9px;
  border-radius: 999px;
  white-space: nowrap;
}
.engine-card p { margin: 10px 0 0; font-size: 0.94rem; color: var(--gray-600); }

.directory-group-title {
  margin-top: 2.4em;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}
.directory-group-title h2 { margin: 0; }
.directory-group-title .view-full {
  font-family: var(--sans);
  font-size: 0.88rem;
  font-weight: 700;
  white-space: nowrap;
}

/* ---------- Footer ---------- */

.site-footer {
  border-top: 1px solid var(--gray-200);
  background: var(--gray-100);
  margin-top: 64px;
  padding: 40px 0;
  color: var(--gray-600);
  font-size: 0.92rem;
}
.site-footer .container {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}
.site-footer nav ul {
  list-style: none;
  display: flex;
  gap: 20px;
  margin: 0;
  padding: 0;
}
.site-footer a { color: var(--gray-600); }
.site-footer a:hover { color: var(--red); }

.back-to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  background: var(--red);
  color: #fff;
  border: none;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  font-size: 1.1rem;
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
  box-shadow: 0 4px 14px rgba(0,0,0,0.18);
}
.back-to-top.visible { opacity: 1; pointer-events: auto; }

.btn {
  display: inline-block;
  background: var(--red);
  color: #fff;
  padding: 12px 22px;
  border-radius: 8px;
  font-weight: 700;
  font-size: 0.95rem;
}
.btn:hover { background: var(--red-dark); color: #fff; text-decoration: none; }
.btn-outline {
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--gray-200);
}
.btn-outline:hover { border-color: var(--red); color: var(--red); }
.btn-row { display: flex; gap: 14px; flex-wrap: wrap; margin-top: 26px; }

/* ---------- Breadcrumbs & chapter nav (sub-pages) ---------- */

.breadcrumb {
  font-size: 0.85rem;
  color: var(--gray-400);
  margin-bottom: 16px;
}
.breadcrumb a { color: var(--gray-600); font-weight: 600; }
.breadcrumb a:hover { color: var(--red); }
.breadcrumb .sep { margin: 0 6px; }
.breadcrumb .current { color: var(--gray-600); }

.chapter-nav {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  margin-top: 3em;
  padding-top: 2em;
  border-top: 1px solid var(--gray-200);
}
.chapter-nav.single { justify-content: flex-end; }
.chapter-nav > a {
  flex: 1;
  border: 1px solid var(--gray-200);
  border-radius: 10px;
  padding: 16px 20px;
  font-family: var(--sans);
}
.chapter-nav > a:hover { border-color: var(--red); text-decoration: none; }
.chapter-nav .dir-label {
  display: block;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--red);
  margin-bottom: 4px;
}
.chapter-nav .chapter-title {
  display: block;
  color: var(--ink);
  font-weight: 700;
  font-size: 0.98rem;
}
.chapter-nav .next-link { text-align: right; }

.related-box {
  background: #fff;
  border: 1px solid var(--gray-200);
  border-radius: 10px;
  padding: 20px 24px;
  margin: 2em 0;
}
.related-box h3 { margin-top: 0; font-size: 0.98rem; }
.related-box ul { margin: 0; padding-left: 1.2em; }
.related-box li { margin-bottom: 6px; font-size: 0.94rem; }

.category-intro {
  max-width: 74ch;
  margin-bottom: 32px;
}

/* ---------- Bar chart (market share) ---------- */

.bar-chart {
  margin: 28px 0 8px;
  max-width: 74ch;
}
.bar-row {
  display: grid;
  grid-template-columns: 110px 1fr 64px;
  align-items: center;
  gap: 14px;
  margin-bottom: 14px;
}
.bar-label {
  font-weight: 600;
  font-size: 0.94rem;
  color: var(--ink);
  text-align: right;
}
.bar-track {
  background: var(--gray-100);
  border-radius: 6px;
  height: 22px;
  overflow: hidden;
}
.bar-fill {
  background: var(--red);
  height: 100%;
  border-radius: 6px;
  min-width: 3px;
  transition: background 0.15s ease;
}
.bar-row:hover .bar-fill { background: var(--red-dark); }
.bar-value {
  font-weight: 700;
  font-size: 0.92rem;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}
.chart-caption {
  font-size: 0.85rem;
  color: var(--gray-400);
  margin-top: 4px;
}
.graphic-image {
  max-width: 100%;
  height: auto;
  border: 1px solid var(--gray-200);
  border-radius: 10px;
  display: block;
  margin: 8px 0 20px;
}
.graphic-label {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--gray-400);
  margin: 0 0 10px;
}
.data-table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  font-size: 0.94rem;
}
.data-table th, .data-table td {
  text-align: left;
  padding: 10px 14px;
  border-bottom: 1px solid var(--gray-200);
}
.data-table th {
  font-family: var(--sans);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--gray-600);
}
.data-table td.num, .data-table th.num { text-align: right; font-variant-numeric: tabular-nums; }
@media (max-width: 560px) {
  .bar-row { grid-template-columns: 78px 1fr 52px; gap: 8px; }
  .bar-label { font-size: 0.82rem; }
}

.table-scroll {
  width: 100%;
  overflow-x: auto;
  margin: 24px 0;
  -webkit-overflow-scrolling: touch;
}
.table-scroll .data-table { margin: 0; min-width: 640px; }
.table-scroll .data-table.wide { min-width: 900px; }

.status-tag {
  display: inline-block;
  font-family: var(--sans);
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 2px 8px;
  border-radius: 100px;
  margin-left: 8px;
  vertical-align: middle;
}
.status-tag.active { background: #e6f4ea; color: #1e7b34; }
.status-tag.retired { background: var(--gray-100); color: var(--gray-600); }
.status-tag.limited { background: var(--red-tint); color: var(--red-dark); }

.country-block {
  border-top: 1px solid var(--gray-200);
  padding-top: 22px;
  margin-top: 28px;
}
.country-block h3 { margin-bottom: 4px; }
.country-block .country-note { color: var(--gray-600); font-size: 0.9rem; margin: 0 0 14px; }