/* Nordhavn AI - ai-development-services.com
   stripe design system, adapted for applied AI engineering.
   Weight 300 at display sizes and negative tracking that tightens with size
   are the signature; they survive the font swap away from sohne-var. */

:root {
  --font: "Geist", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SFMono-Regular", ui-monospace, Menlo, Consolas, monospace;

  --c-heading: #061b31;
  --c-body: #64748d;
  --c-label: #273951;
  --c-primary: #533afd;
  --c-primary-hover: #4434d4;
  --c-primary-soft: #b9b9f9;
  --c-dark: #1c1e54;
  --c-darkest: #0d253d;
  --c-border: #e5edf5;
  --c-surface: #ffffff;
  --c-surface-alt: #f6f9fc;
  --c-success: #108c3d;
  --c-success-bg: rgba(21, 190, 83, .2);
  --c-decor-ruby: #ea2261;
  --c-decor-magenta: #f96bee;
  --c-on-dark: #ffffff;
  --c-on-dark-muted: rgba(255, 255, 255, .78);

  --r-sm: 4px;
  --r-md: 6px;
  --r-lg: 8px;

  --sh-1: rgba(23, 23, 23, .06) 0 3px 6px;
  --sh-2: rgba(23, 23, 23, .08) 0 15px 35px;
  --sh-3: rgba(50, 50, 93, .25) 0 30px 45px -30px, rgba(0, 0, 0, .1) 0 18px 36px -18px;

  --w-max: 1080px;
  --s-1: 4px; --s-2: 8px; --s-3: 12px; --s-4: 16px;
  --s-5: 24px; --s-6: 32px; --s-7: 48px; --s-8: 64px;
}

@font-face { font-family: "Geist"; src: url("fonts/geist-300-latin.woff2") format("woff2"); font-weight: 300; font-style: normal; font-display: swap; }
@font-face { font-family: "Geist"; src: url("fonts/geist-400-latin.woff2") format("woff2"); font-weight: 400; font-style: normal; font-display: swap; }

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

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

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}

body {
  margin: 0;
  font-family: var(--font);
  font-weight: 300;
  font-size: 16px;
  line-height: 1.4;
  color: var(--c-body);
  background: var(--c-surface);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 { margin: 0 0 var(--s-4); }
h1 { font-size: 56px; font-weight: 300; line-height: 1.03; letter-spacing: -1.4px; color: var(--c-heading); }
h2 { font-size: 32px; font-weight: 300; line-height: 1.10; letter-spacing: -.64px; color: var(--c-heading); }
h3 { font-size: 22px; font-weight: 300; line-height: 1.10; letter-spacing: -.22px; color: var(--c-heading); }

p { margin: 0 0 var(--s-4); }
.lead { font-size: 18px; font-weight: 300; line-height: 1.4; }
strong { font-weight: 400; color: var(--c-label); }
small { font-size: 14px; }

/* Inline links carry an underline, not colour alone: colour by itself fails
   WCAG 1.4.1 inside a text block. Chrome elements opt out below. */
a { color: var(--c-primary); text-decoration: underline; text-underline-offset: 2px; }
a:hover { color: var(--c-primary-hover); }
.btn, .brand, .topic-chips a, .footer-links a { text-decoration: none; }
.footer-links a:hover { text-decoration: underline; }
a:focus-visible, button:focus-visible, summary:focus-visible {
  outline: 2px solid var(--c-primary);
  outline-offset: 2px;
  border-radius: var(--r-sm);
}

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

ul, ol { margin: 0 0 var(--s-4); padding-left: 20px; }
li { margin-bottom: var(--s-2); }

table { border-collapse: collapse; width: 100%; font-variant-numeric: tabular-nums; }

.btn {
  display: inline-block;
  font-size: 16px;
  font-weight: 400;
  border-radius: var(--r-sm);
  padding: 8px 16px;
  background: var(--c-primary);
  color: var(--c-on-dark);
  border: 1px solid var(--c-primary);
  box-shadow: var(--sh-1);
  transition: background .15s ease, transform .15s ease;
}
.btn:hover { background: var(--c-primary-hover); border-color: var(--c-primary-hover); color: var(--c-on-dark); text-decoration: none; transform: translateY(-1px); }
.btn--ghost { background: var(--c-surface); color: var(--c-primary); border-color: var(--c-border); }
.btn--ghost:hover { background: var(--c-surface); color: var(--c-primary-hover); border-color: var(--c-primary-soft); }

/* ---------- layout ---------- */

.wrap { max-width: var(--w-max); margin: 0 auto; padding: 0 var(--s-5); }

.section { padding: var(--s-8) 0; border-top: 1px solid var(--c-border); }
.section:first-of-type { border-top: 0; }
.section-title { margin-bottom: var(--s-3); }
.section-title + p { max-width: 46em; }
.eyebrow {
  font-size: 13px;
  font-weight: 400;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--c-primary);
  margin: 0 0 var(--s-3);
}

.grid { display: grid; gap: var(--s-5); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

.figure-note { font-size: 14px; color: var(--c-body); margin-top: var(--s-3); text-align: left; }
.mono { font-family: var(--font-mono); font-size: .95em; }


.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 60;
  background: var(--c-surface);
  color: var(--c-primary);
  border: 1px solid var(--c-border);
  border-radius: var(--r-sm);
  padding: var(--s-3) var(--s-4);
}
.skip-link:focus { left: var(--s-4); top: var(--s-4); }

/* ---------- header and hero ---------- */

.site-header { padding: var(--s-5) 0; }
.site-header__inner { display: flex; align-items: center; justify-content: space-between; gap: var(--s-4); }
.brand { display: flex; align-items: center; gap: var(--s-3); color: var(--c-heading); font-size: 17px; font-weight: 400; }
.brand:hover { color: var(--c-heading); text-decoration: none; }
.brand__mark { width: 28px; height: 28px; display: block; }

.hero { padding: var(--s-7) 0 var(--s-8); }
.hero__inner { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr); gap: var(--s-8); align-items: center; }
.hero__subhead { font-size: 20px; line-height: 1.45; max-width: 32em; margin-bottom: var(--s-5); }
.hero-price {
  font-size: 16px;
  color: var(--c-label);
  background: var(--c-surface-alt);
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  padding: var(--s-4);
  margin-bottom: var(--s-5);
}
.hero-price span { color: var(--c-heading); font-weight: 400; }
.hero__actions { display: flex; flex-wrap: wrap; gap: var(--s-3); }
.hero__figure { margin: 0; }

/* ---------- at a glance and jump nav ---------- */

.glance {
  background: var(--c-surface-alt);
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  padding: var(--s-6);
  color: var(--c-label);
  box-shadow: var(--sh-1);
}
.glance h2 { margin-bottom: var(--s-4); }
.glance__list { list-style: none; padding: 0; margin: 0 0 var(--s-5); }
.glance__list li { padding-left: var(--s-5); position: relative; margin-bottom: var(--s-3); color: var(--c-label); }
.glance__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 12px;
  height: 3px;
  border-radius: 2px;
  background: var(--c-primary);
}

.topic-chips { display: flex; flex-wrap: wrap; gap: var(--s-2); }
.topic-chips a {
  display: inline-block;
  font-size: 14px;
  padding: 6px 12px;
  border: 1px solid var(--c-border);
  border-radius: 999px;
  background: var(--c-surface);
  color: var(--c-primary);
}
.topic-chips a:hover { border-color: var(--c-primary-soft); color: var(--c-primary-hover); text-decoration: none; }

/* ---------- cards ---------- */

.card {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  padding: var(--s-5);
  box-shadow: var(--sh-1);
}
.card h3 { margin-bottom: var(--s-2); }
.card p:last-child { margin-bottom: 0; }
.card-price { font-size: 16px; color: var(--c-heading); font-weight: 400; margin-bottom: var(--s-3); }
.card-price span { color: var(--c-body); font-weight: 300; }

.stat-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: var(--s-5); }
.stat { border-top: 3px solid var(--c-primary); padding-top: var(--s-4); }
.stat__value { display: block; font-size: 44px; line-height: 1; font-weight: 300; letter-spacing: -1px; color: var(--c-heading); }
.stat__label { display: block; margin-top: var(--s-3); font-size: 15px; color: var(--c-body); }

/* ---------- case cards ---------- */

.case-card { display: grid; gap: var(--s-5); }
.case-card img { border-radius: var(--r-md); border: 1px solid var(--c-border); }
.case-card__rows { margin: 0; }
.case-card__rows dt { font-size: 13px; letter-spacing: .06em; text-transform: uppercase; color: var(--c-primary); margin-bottom: var(--s-1); }
.case-card__rows dd { margin: 0 0 var(--s-4); color: var(--c-body); }
.case-card__rows dd:last-child { margin-bottom: 0; }

/* ---------- process steps ---------- */

.process-step {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  gap: var(--s-5);
  padding: var(--s-5) 0;
  border-top: 1px solid var(--c-border);
}
.process-step:first-of-type { border-top: 0; }
.process-step__n {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--c-primary);
  color: var(--c-on-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: 400;
}
.step-meta { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--s-4); margin: var(--s-4) 0 0; }
.step-meta dt { font-size: 13px; letter-spacing: .06em; text-transform: uppercase; color: var(--c-primary); margin-bottom: var(--s-1); }
.step-meta dd { margin: 0; font-size: 15px; color: var(--c-label); }

/* ---------- tables ---------- */

.table-wrap { overflow-x: auto; padding: 6px; margin: 0 -6px var(--s-3); }
.data-table { min-width: 660px; background: var(--c-surface); border: 1px solid var(--c-border); border-radius: var(--r-lg); box-shadow: var(--sh-1); }
.data-table caption { caption-side: top; text-align: left; padding: 0 0 var(--s-3); }
.data-table th, .data-table td { padding: var(--s-3) var(--s-4); text-align: left; vertical-align: top; border-bottom: 1px solid var(--c-border); font-size: 15px; }
.data-table thead th { font-weight: 400; color: var(--c-heading); background: var(--c-surface-alt); font-size: 14px; letter-spacing: .02em; }
.data-table tbody th { font-weight: 400; color: var(--c-heading); }
.data-table td { color: var(--c-body); }
.data-table tbody tr:last-child th, .data-table tbody tr:last-child td { border-bottom: 0; }
.sourcing-table { min-width: 860px; }

/* ---------- certificates ---------- */

.cert-card { display: grid; gap: var(--s-4); }
.cert-card img { border-radius: var(--r-md); }
.cert-card__fields { margin: 0; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--s-3) var(--s-4); }
.cert-card__fields dt { font-size: 12px; letter-spacing: .06em; text-transform: uppercase; color: var(--c-primary); }
.cert-card__fields dd { margin: 0 0 var(--s-2); font-size: 15px; color: var(--c-label); }

/* ---------- reviews and ratings ---------- */

.review-card { background: var(--c-surface); border: 1px solid var(--c-border); border-radius: var(--r-lg); padding: var(--s-5); box-shadow: var(--sh-1); }
.review-card__quote { font-size: 17px; line-height: 1.45; color: var(--c-label); }
.review-card__header { font-size: 15px; color: var(--c-heading); font-weight: 400; margin-bottom: var(--s-3); }
.review-card__header span { display: block; color: var(--c-body); font-weight: 300; }
.review-meta { font-size: 14px; color: var(--c-body); margin: 0; }

.rating-cards { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--s-5); }
.rating-card { background: var(--c-surface-alt); border: 1px solid var(--c-border); border-radius: var(--r-lg); padding: var(--s-5); color: var(--c-label); }
.rating-score { display: block; font-size: 40px; line-height: 1; font-weight: 300; color: var(--c-heading); letter-spacing: -1px; }
.rating-platform { display: block; margin-bottom: var(--s-2); font-size: 15px; font-weight: 400; color: var(--c-label); }
.rating-count { display: block; margin-top: var(--s-2); font-size: 15px; color: var(--c-label); }

/* ---------- pullquotes ---------- */

.pullquote { margin: 0; padding: var(--s-5); border-left: 3px solid var(--c-primary); background: var(--c-surface-alt); border-radius: 0 var(--r-lg) var(--r-lg) 0; color: var(--c-label); }
.pullquote blockquote { margin: 0 0 var(--s-3); font-size: 18px; line-height: 1.45; color: var(--c-heading); }
.pullquote figcaption { font-size: 14px; color: var(--c-label); }
.pullquote cite { font-style: normal; color: var(--c-label); }

/* ---------- dark panels ---------- */

.panel-dark {
  background: var(--c-dark);
  color: var(--c-on-dark-muted);
  border-radius: var(--r-lg);
  padding: var(--s-7) var(--s-6);
}
.panel-dark .stat__value { color: var(--c-on-dark); }
.panel-dark .stat__label { color: var(--c-on-dark-muted); }
.panel-dark .stat { border-top-color: var(--c-primary-soft); }

/* ---------- accordions ---------- */

.accordion { border-top: 1px solid var(--c-border); }
.accordion details { border-bottom: 1px solid var(--c-border); }
.accordion summary {
  cursor: pointer;
  padding: var(--s-4) 0;
  font-size: 18px;
  font-weight: 400;
  color: var(--c-heading);
  list-style: none;
  display: flex;
  justify-content: space-between;
  gap: var(--s-4);
}
.accordion summary::-webkit-details-marker { display: none; }
.accordion summary::after { content: "+"; color: var(--c-primary); font-size: 20px; line-height: 1; }
.accordion details[open] summary::after { content: "\2013"; }
.accordion details > p, .accordion details > ul { margin-bottom: var(--s-4); }
.accordion details > p:first-of-type { margin-top: 0; }

.glossary { list-style: none; padding: 0; margin: 0; }
.glossary dt { font-size: 17px; font-weight: 400; color: var(--c-heading); margin-top: var(--s-4); }
.glossary dd { margin: var(--s-1) 0 0; }

/* ---------- founder ---------- */

.founder { display: grid; grid-template-columns: 200px minmax(0, 1fr); gap: var(--s-6); align-items: start; }
.founder img { border-radius: var(--r-lg); border: 1px solid var(--c-border); }
.byline { font-size: 15px; color: var(--c-body); margin-top: var(--s-5); }

/* ---------- sticky CTA ---------- */

.sticky-cta {
  position: fixed;
  right: var(--s-5);
  bottom: var(--s-5);
  z-index: 40;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  box-shadow: var(--sh-2);
  padding: var(--s-3) var(--s-4);
  display: flex;
  align-items: center;
  gap: var(--s-4);
  font-size: 15px;
  color: var(--c-label);
}
.sticky-cta__text { display: none; }

/* ---------- footer ---------- */

.site-footer { background: var(--c-darkest); color: var(--c-on-dark-muted); padding: var(--s-8) 0 var(--s-7); margin-top: var(--s-8); }
.site-footer h3 { color: var(--c-on-dark); }
.site-footer a { color: var(--c-on-dark); text-decoration: underline; }
.site-footer__grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--s-6); }
.legal-details { font-size: 15px; color: var(--c-on-dark-muted); }
.legal-details address { font-style: normal; margin-bottom: var(--s-3); color: var(--c-on-dark-muted); }
/* 24px minimum touch target, WCAG 2.5.8 */
.legal-details a, .site-footer li a { display: inline-block; min-height: 24px; line-height: 24px; }
.footer-note { border-top: 1px solid rgba(255, 255, 255, .18); margin-top: var(--s-6); padding-top: var(--s-5); font-size: 14px; color: var(--c-on-dark-muted); }
.footer-links { list-style: none; padding: 0; margin: 0; }

/* ---------- reveal, applied by JS to below-fold blocks only ---------- */

.reveal-init { opacity: 0; transform: translateY(14px); }
.reveal { transition: opacity .5s ease, transform .5s ease; }

/* ---------- responsive ---------- */

@media (max-width: 900px) {
  .hero__inner { grid-template-columns: minmax(0, 1fr); gap: var(--s-6); }
  .grid--3, .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .stat-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .founder { grid-template-columns: minmax(0, 1fr); }
  .founder img { max-width: 200px; }
  .site-footer__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 640px) {
  h1 { font-size: 32px; letter-spacing: -.8px; }
  h2 { font-size: 26px; letter-spacing: -.5px; }
  h3 { font-size: 20px; }
  body { padding-bottom: 76px; }
  .wrap { padding: 0 var(--s-4); }
  .section { padding: var(--s-7) 0; }
  .grid--2, .grid--3, .grid--4 { grid-template-columns: minmax(0, 1fr); }
  .stat-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .step-meta { grid-template-columns: minmax(0, 1fr); gap: var(--s-3); }
  .cert-card__fields { grid-template-columns: minmax(0, 1fr); }
  .rating-cards { grid-template-columns: minmax(0, 1fr); }
  .site-footer__grid { grid-template-columns: minmax(0, 1fr); }
  .process-step { grid-template-columns: 44px minmax(0, 1fr); gap: var(--s-4); }
  .hero__subhead { font-size: 18px; }

  .sticky-cta {
    left: 0;
    right: 0;
    bottom: 0;
    border-radius: 0;
    border-left: 0;
    border-right: 0;
    border-bottom: 0;
    justify-content: space-between;
    padding: var(--s-3) var(--s-4);
  }
  .sticky-cta__text { display: block; }
}

/* ---------- top-10 ranking ---------- */

.rank-board { list-style: none; padding: 0; margin: 0 0 var(--s-6); display: grid; gap: var(--s-2); }
.rank-row {
  display: flex; align-items: baseline; gap: var(--s-4);
  background: var(--c-surface-alt); border: 1px solid var(--c-border);
  border-radius: var(--r-md); padding: var(--s-3) var(--s-5);
}
.rank-row a { color: var(--c-primary); font-size: 18px; }
.rank-row a:hover { color: var(--c-primary-hover); }
.rank-no { font-family: var(--font-mono); font-size: 13px; color: var(--c-label); min-width: 26px; flex: none; }
.rank-row--own { border-color: var(--c-primary-soft); background: var(--c-surface); }
.rank-flag {
  font-family: var(--font-mono); font-size: 11px; letter-spacing: .08em;
  text-transform: uppercase; color: var(--c-primary); margin-left: auto;
}
.rank-note { border-top: 1px solid var(--c-border); padding: var(--s-5) 0; scroll-margin-top: 88px; }
.rank-note h3 { margin-bottom: var(--s-3); }
.rank-note p { color: var(--c-body); margin-bottom: var(--s-3); }
.rank-note--own { border-left: 3px solid var(--c-primary); padding-left: var(--s-5); }