:root {
  --ink: #0b0b0b;
  --paper: #ffffff;
  --panel: #f6f5f1;
  --tile: #eceae3;
  --g1: #6a665d;
  --g2: #9b978d;
  --g3: #c9c5ba;
  --line: #e7e4da;
  --line2: #d4d0c4;
  --disp: 'Space Grotesk', system-ui, sans-serif;
  --mono: 'Space Mono', 'Space Grotesk', monospace;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html, body {
  font-family: var(--disp);
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  line-height: 1.5;
}
a { color: inherit; text-decoration: underline; text-decoration-color: var(--g3); text-underline-offset: 3px; }
a:hover { text-decoration-color: var(--ink); }
img { max-width: 100%; display: block; }
ul, ol { list-style: none; }

/* ---------- header ---------- */
.seo-header {
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 20px 28px;
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 10;
}
.seo-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  flex: none;
}
.seo-mark {
  display: inline-flex;
  width: 30px;
  height: 30px;
  flex: none;
}
.seo-mark svg { width: 100%; height: 100%; }
.seo-name {
  font-weight: 700;
  font-size: 18px;
  letter-spacing: -0.04em;
}
.seo-nav {
  display: flex;
  gap: 18px;
  margin-left: 12px;
  flex-wrap: wrap;
  flex: 1;
  min-width: 0;
}
.seo-nav a {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--g1);
}
.seo-nav a:hover,
.seo-nav a[aria-current='page'] { color: var(--ink); }
.seo-cta {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  text-decoration: none;
  background: var(--ink);
  color: var(--paper);
  padding: 10px 14px;
  border-radius: 999px;
  flex: none;
}

/* ---------- main + breadcrumbs ---------- */
main {
  max-width: 880px;
  margin: 0 auto;
  padding: 24px 28px 56px;
}
.seo-crumbs {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--g1);
  margin-bottom: 26px;
}
.seo-crumbs a { text-decoration: none; }
.seo-crumbs a:hover { text-decoration: underline; }
.seo-crumb-sep { margin: 0 6px; color: var(--g3); }

/* ---------- hero ---------- */
.seo-hero {
  border: 1px solid var(--ink);
  border-radius: 18px;
  padding: 32px 28px;
  margin-bottom: 32px;
}
.seo-eyebrow {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--g1);
  margin-bottom: 14px;
}
h1 {
  font-weight: 700;
  font-size: 40px;
  line-height: 1.04;
  letter-spacing: -0.04em;
  margin-bottom: 14px;
}
h2 {
  font-weight: 700;
  font-size: 22px;
  letter-spacing: -0.02em;
  margin-bottom: 14px;
  margin-top: 8px;
}
h3 {
  font-weight: 700;
  font-size: 16px;
  letter-spacing: -0.01em;
  margin-bottom: 10px;
  margin-top: 12px;
}
.seo-lede {
  font-size: 16px;
  color: var(--g1);
  max-width: 60ch;
  margin-bottom: 18px;
}
.seo-cta-big {
  display: inline-block;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  text-decoration: none;
  padding: 14px 20px;
  border-radius: 999px;
}

/* ---------- stats grid ---------- */
.seo-stats {
  margin: 32px 0;
}
.seo-stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 14px;
  margin-top: 12px;
}
.seo-stat {
  border: 1px solid var(--line2);
  border-radius: 14px;
  padding: 18px;
  background: var(--panel);
}
.seo-stat-num {
  font-family: var(--mono);
  font-weight: 700;
  font-size: 26px;
  letter-spacing: -0.02em;
  line-height: 1;
}
.seo-stat-label {
  font-size: 13px;
  color: var(--g1);
  margin-top: 8px;
  line-height: 1.4;
}
.seo-stat-source {
  display: block;
  margin-top: 12px;
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--g2);
  text-decoration: underline;
  text-decoration-color: var(--g3);
}
.seo-stat-source:hover {
  color: var(--ink);
  text-decoration-color: var(--ink);
}

/* ---------- section + cards ---------- */
.seo-section { margin: 32px 0; }
.seo-section p {
  font-size: 15px;
  color: var(--ink);
  max-width: 65ch;
}
.seo-card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 12px;
  margin-top: 12px;
}
.seo-card {
  display: block;
  border: 1px solid var(--ink);
  border-radius: 14px;
  padding: 16px;
  text-decoration: none;
  background: var(--paper);
  transition: 0.13s;
}
.seo-card:hover {
  background: var(--ink);
  color: var(--paper);
}
.seo-card:hover .seo-card-meta { color: var(--g3); }
.seo-card-name {
  font-weight: 700;
  font-size: 16px;
  letter-spacing: -0.01em;
}
.seo-card-meta {
  font-family: var(--mono);
  font-size: 10.5px;
  color: var(--g1);
  margin-top: 4px;
}
.seo-pill-row { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
.seo-pill {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  border: 1px solid var(--g3);
  border-radius: 999px;
  padding: 6px 12px;
  color: var(--g1);
}
.seo-pillars li { margin-bottom: 12px; }
.seo-pillars li a { text-decoration: none; }
.seo-pillars li a:hover { text-decoration: underline; }
.seo-other-cities { color: var(--g1); font-family: var(--mono); font-size: 13px; }

/* ---------- FAQ ---------- */
.seo-faq { margin: 32px 0; }
.seo-faq-item {
  border-top: 1px solid var(--line);
  padding: 16px 0;
}
.seo-faq-item:last-of-type { border-bottom: 1px solid var(--line); }
.seo-faq-item summary {
  font-weight: 600;
  font-size: 15px;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.seo-faq-item summary::after {
  content: '+';
  font-family: var(--mono);
  font-size: 18px;
  color: var(--g1);
  transition: transform 0.2s;
}
.seo-faq-item[open] summary::after { transform: rotate(45deg); }
.seo-faq-a {
  margin-top: 10px;
  font-size: 14px;
  color: var(--g1);
  line-height: 1.55;
  max-width: 65ch;
}
.seo-source-list li {
  border-top: 1px solid var(--line);
  padding: 10px 0;
  font-size: 14px;
  color: var(--ink);
}
.seo-source-list li:last-child { border-bottom: 1px solid var(--line); }
.seo-source-list strong {
  font-family: var(--mono);
  margin-right: 6px;
}

/* ---------- footer ---------- */
.seo-footer {
  border-top: 1px solid var(--line);
  background: var(--panel);
  margin-top: 60px;
  padding: 40px 28px 24px;
}
.seo-foot-cols {
  max-width: 880px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 30px;
}
.seo-foot-cols > div { font-size: 13px; color: var(--g1); }
.seo-foot-cols strong {
  display: block;
  color: var(--ink);
  margin-bottom: 10px;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}
.seo-foot-cols a {
  display: block;
  color: var(--g1);
  margin-bottom: 6px;
  text-decoration: none;
  font-size: 13px;
}
.seo-foot-cols a:hover { color: var(--ink); }
.seo-foot-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
}
.seo-foot-brand .seo-mark { width: 24px; height: 24px; }
.seo-foot-brand .seo-name { font-size: 16px; }
.seo-foot-bottom {
  max-width: 880px;
  margin: 36px auto 0;
  padding-top: 18px;
  border-top: 1px solid var(--line2);
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.04em;
  color: var(--g2);
  text-align: center;
}

/* ---------- mobile ---------- */
@media (max-width: 640px) {
  .seo-header { padding: 14px 18px; gap: 12px; }
  .seo-nav { display: none; }
  main { padding: 16px 18px 40px; }
  .seo-hero { padding: 24px 20px; }
  h1 { font-size: 30px; }
  h2 { font-size: 19px; }
  .seo-stat-grid { grid-template-columns: 1fr 1fr; }
}

/* ---------- per-page references ---------- */
.seo-references {
  margin: 40px 0 0;
  border-top: 1px solid var(--line);
  padding-top: 24px;
}
.seo-references h2 {
  font-size: 16px;
  letter-spacing: -0.01em;
  margin-bottom: 6px;
}
.seo-ref-intro {
  font-size: 12.5px;
  color: var(--g1);
  max-width: 60ch;
  margin-bottom: 14px;
  font-family: var(--mono);
  line-height: 1.5;
}
.seo-ref-list {
  list-style: decimal;
  padding-left: 22px;
}
.seo-ref-list li {
  font-size: 13px;
  line-height: 1.55;
  margin-bottom: 8px;
  color: var(--ink);
}
.seo-ref-list a {
  font-weight: 600;
  text-decoration-color: var(--g3);
}
.seo-ref-list a:hover {
  text-decoration-color: var(--ink);
}
.seo-ref-meta {
  color: var(--g1);
  font-family: var(--mono);
  font-size: 11.5px;
  margin-left: 6px;
}

/* ---------- language switcher ---------- */
.seo-lang {
  position: relative;
  flex: none;
}
.seo-lang summary {
  list-style: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.06em;
  padding: 8px 10px;
  border: 1px solid var(--ink);
  border-radius: 999px;
  user-select: none;
}
.seo-lang summary::-webkit-details-marker { display: none; }
.seo-lang summary:hover { background: var(--panel); }
.seo-lang-chev { color: var(--g1); font-size: 10px; }
.seo-lang-menu {
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  background: var(--paper);
  border: 1px solid var(--ink);
  border-radius: 12px;
  padding: 6px;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  min-width: 160px;
  z-index: 20;
}
.seo-lang-menu button,
.seo-lang-menu a {
  text-align: left;
  font-family: var(--disp);
  font-size: 13px;
  font-weight: 500;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px 10px;
  border-radius: 8px;
  color: var(--ink);
  text-decoration: none;
  display: block;
}
.seo-lang-menu button:hover,
.seo-lang-menu a:hover { background: var(--panel); }
.seo-lang-menu button.on,
.seo-lang-menu a.on {
  background: var(--ink);
  color: var(--paper);
}
@media (max-width: 640px) {
  .seo-lang summary { padding: 7px 9px; font-size: 10.5px; }
  .seo-lang-menu { min-width: 140px; }
}