/* ============================================================
   Tokens — shared with the pipeline diagram
   ============================================================ */
:root {
  --ground:       #eef0f2;
  --surface:      #fafbfc;
  --surface-sunk: #e2e5e9;
  --ink:          #14171c;
  --ink-2:        #474d56;
  --ink-3:        #767d87;
  --rule:         #ccd1d7;
  --rule-soft:    #dfe3e8;

  --gen:  #2f5fd0;
  --chk:  #0e7490;
  --hum:  #a3316b;
  --code: #147a5e;
  --stop: #c02626;

  --shadow: 0 1px 2px rgba(20,23,28,.06), 0 16px 40px -16px rgba(20,23,28,.28);

  --ff-display: "Space Grotesk","Inter",system-ui,-apple-system,"Segoe UI",Arial,sans-serif;
  --ff-body: "Inter",system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  --ff-mono: "IBM Plex Mono",ui-monospace,"Cascadia Mono","SF Mono",Menlo,Consolas,monospace;

  --fs-xs:   .6875rem;
  --fs-sm:   .8125rem;
  --fs-base: 1.0625rem;
  --fs-lg:   1.1875rem;
  --fs-xl:   1.5rem;

  --wrap: 72rem;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --ground:       #15171b;
    --surface:      #1d2026;
    --surface-sunk: #0e1013;
    --ink:          #e8eaed;
    --ink-2:        #a4abb4;
    --ink-3:        #737a84;
    --rule:         #2e333b;
    --rule-soft:    #23272e;

    --gen:  #7aa2f7;
    --chk:  #56b6c2;
    --hum:  #e77fb3;
    --code: #4ec9a0;
    --stop: #ff6b6b;

    --shadow: 0 1px 2px rgba(0,0,0,.5), 0 18px 44px -16px rgba(0,0,0,.8);
  }
}

:root[data-theme="dark"] {
  --ground:       #15171b;
  --surface:      #1d2026;
  --surface-sunk: #0e1013;
  --ink:          #e8eaed;
  --ink-2:        #a4abb4;
  --ink-3:        #737a84;
  --rule:         #2e333b;
  --rule-soft:    #23272e;

  --gen:  #7aa2f7;
  --chk:  #56b6c2;
  --hum:  #e77fb3;
  --code: #4ec9a0;
  --stop: #ff6b6b;

  --shadow: 0 1px 2px rgba(0,0,0,.5), 0 18px 44px -16px rgba(0,0,0,.8);
}

/* ============================================================
   Base
   ============================================================ */
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--ground);
  color: var(--ink);
  font-family: var(--ff-body);
  font-size: var(--fs-base);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 1.5rem; }
.prose { max-width: 42rem; }

p { margin: 0 0 1em; }
p:last-child { margin-bottom: 0; }
a { color: inherit; text-underline-offset: .18em; }
img { max-width: 100%; }

:focus-visible { outline: 2px solid var(--ink); outline-offset: 4px; border-radius: 2px; }

.eyebrow {
  font-family: var(--ff-mono);
  font-size: var(--fs-xs);
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin: 0;
}

.skip {
  position: absolute; left: -9999px;
  background: var(--surface); color: var(--ink);
  padding: .6rem 1rem; border: 1px solid var(--rule); z-index: 100;
}
.skip:focus { left: 1rem; top: 1rem; }

/* ============================================================
   Site header
   ============================================================ */
.site-head {
  border-bottom: 1px solid var(--rule);
  background: var(--ground);
  position: sticky; top: 0; z-index: 50;
}

.site-head .wrap {
  display: flex;
  align-items: center;
  gap: 1rem;
  min-height: 4.25rem;
  flex-wrap: wrap;
  padding-block: .75rem;
}

.brand { text-decoration: none; display: block; margin-right: auto; }
.brand b {
  display: block;
  font-family: var(--ff-display);
  font-size: 1.1875rem;
  font-weight: 700;
  letter-spacing: -.01em;
  line-height: 1.15;
}
.brand span {
  display: block;
  font-family: var(--ff-mono);
  font-size: var(--fs-xs);
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-top: .15rem;
}

.site-nav { display: flex; align-items: center; gap: .5rem; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: .45em;
  font-family: var(--ff-mono);
  font-size: var(--fs-xs);
  letter-spacing: .1em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--rule);
  padding: .6em .95em;
  cursor: pointer;
  transition: border-color .15s ease, transform .15s ease, box-shadow .15s ease;
}
.btn:hover { border-color: var(--ink); transform: translateY(-1px); }
.btn[aria-current="page"] { border-color: var(--ink); background: var(--surface-sunk); }

.btn-solid { background: var(--ink); color: var(--ground); border-color: var(--ink); }
.btn-solid:hover { box-shadow: var(--shadow); }

.btn-lg { font-size: var(--fs-sm); padding: .8em 1.35em; }

.theme-toggle {
  background: none;
  border: 1px solid var(--rule);
  color: var(--ink-3);
  font-family: var(--ff-mono);
  font-size: var(--fs-xs);
  padding: .55em .7em;
  cursor: pointer;
  line-height: 1;
}
.theme-toggle:hover { color: var(--ink); border-color: var(--ink); }

/* ============================================================
   Hero
   ============================================================ */
.hero { padding: clamp(3rem, 9vw, 7rem) 0 clamp(2.5rem, 5vw, 4rem); border-bottom: 1px solid var(--rule); }

.hero h1 {
  font-family: var(--ff-display);
  font-weight: 700;
  font-size: clamp(2rem, 5.6vw, 3.375rem);
  line-height: 1.05;
  letter-spacing: -.02em;
  text-wrap: balance;
  margin: 1.25rem 0 1rem;
  max-width: 20ch;
}

.hero .deck {
  font-size: clamp(1.0625rem, 2.2vw, 1.3125rem);
  font-weight: 400;
  line-height: 1.5;
  color: var(--ink-2);
  max-width: 46ch;
  margin: 0 0 2rem;
}

.hero-actions { display: flex; flex-wrap: wrap; gap: .75rem; }

/* ============================================================
   Sections
   ============================================================ */
.section { padding: clamp(2.5rem, 6vw, 4.5rem) 0; border-bottom: 1px solid var(--rule); }
.section:last-of-type { border-bottom: 0; }

.section h2 {
  font-family: var(--ff-display);
  font-weight: 700;
  font-size: var(--fs-xl);
  letter-spacing: -.01em;
  margin: .5rem 0 1.75rem;
}

.section h3 {
  font-family: var(--ff-display);
  font-weight: 700;
  font-size: var(--fs-lg);
  margin: 0 0 .6rem;
}

/* ---- card grid ---- */
.grid { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr)); }

.card {
  background: var(--surface);
  border: 1px solid var(--rule-soft);
  border-top: 3px solid var(--accent, var(--rule));
  padding: 1.125rem 1.25rem 1.25rem;
}

.card[data-accent="gen"]  { --accent: var(--gen); }
.card[data-accent="chk"]  { --accent: var(--chk); }
.card[data-accent="hum"]  { --accent: var(--hum); }
.card[data-accent="code"] { --accent: var(--code); }
.card[data-accent="stop"] { --accent: var(--stop); }

.card-name {
  font-family: var(--ff-mono);
  font-size: var(--fs-xs);
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--accent, var(--ink-3));
  margin-bottom: .55rem;
}

.card p, .card li { font-size: var(--fs-sm); line-height: 1.55; color: var(--ink-2); }
.card ul { margin: 0; padding-left: 1.1em; }
.card li { margin-bottom: .25em; }
.card li::marker { color: var(--ink-3); }

/* ---- fact rows (education, languages) ---- */
.facts { display: grid; gap: 1.25rem; grid-template-columns: repeat(auto-fit, minmax(17rem, 1fr)); }

.fact { border-top: 1px solid var(--rule); padding-top: 1rem; }
.fact b { display: block; font-family: var(--ff-display); font-size: var(--fs-lg); font-weight: 700; margin-bottom: .3rem; }
.fact span { display: block; font-size: var(--fs-sm); color: var(--ink-2); }
.fact .meta {
  font-family: var(--ff-mono);
  font-size: var(--fs-xs);
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: .5rem;
}

/* ============================================================
   Case pages
   ============================================================ */
.case { border-bottom: 1px solid var(--rule); padding: clamp(2.5rem, 5vw, 4rem) 0; }
.case:last-of-type { border-bottom: 0; }

/* clear the sticky header when jumping to an anchor */
.case[id], .section[id] { scroll-margin-top: 6rem; }

.case-num {
  font-family: var(--ff-mono);
  font-size: var(--fs-xs);
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--ink-3);
}

.case h2 {
  font-family: var(--ff-display);
  font-weight: 700;
  font-size: clamp(1.5rem, 3.4vw, 2.125rem);
  line-height: 1.15;
  letter-spacing: -.015em;
  text-wrap: balance;
  margin: .35rem 0 1.25rem;
  max-width: 24ch;
}

.case .lede { font-size: var(--fs-lg); color: var(--ink-2); max-width: 40rem; }

.case h3 {
  font-family: var(--ff-display);
  font-size: var(--fs-lg);
  font-weight: 700;
  margin: 2rem 0 .6rem;
}

.case p, .case li { max-width: 42rem; }
.case ul { padding-left: 1.15em; }
.case li { margin-bottom: .4em; }
.case li::marker { color: var(--ink-3); }

.case-actions { display: flex; flex-wrap: wrap; gap: .75rem; margin-top: 1.75rem; }

/* ---- contents list on the cases page ---- */
.toc { list-style: none; margin: 2.25rem 0 0; padding: 0; max-width: 36rem; }
.toc li:last-child a { border-bottom: 1px solid var(--rule); }

.toc a {
  display: flex;
  align-items: baseline;
  gap: .9rem;
  text-decoration: none;
  border-top: 1px solid var(--rule);
  padding: .7rem .25rem;
  transition: padding-left .15s ease;
}
.toc a:hover { padding-left: .6rem; }

.toc .n {
  font-family: var(--ff-mono);
  font-size: var(--fs-xs);
  letter-spacing: .12em;
  color: var(--ink-3);
  flex: none;
}
.toc .t { font-family: var(--ff-display); font-size: var(--fs-base); color: var(--ink); }
.toc .k { margin-left: auto; font-family: var(--ff-mono); font-size: var(--fs-xs); color: var(--ink-3); text-align: right; }

@media (max-width: 30rem) {
  .toc .k { display: none; }
}

.pull {
  border-left: 3px solid var(--gen);
  background: var(--surface);
  padding: 1rem 1.25rem;
  margin: 1.75rem 0;
  color: var(--ink);
  font-family: var(--ff-display);
  font-weight: 500;
  font-size: var(--fs-lg);
  line-height: 1.45;
  max-width: 38rem;
}

.scenarios { list-style: none; margin: 1rem 0; padding: 0; max-width: 42rem; }
.scenarios li {
  border-left: 2px solid var(--chk);
  padding: .1rem 0 .1rem .9rem;
  margin-bottom: .75rem;
  font-size: var(--fs-sm);
  color: var(--ink-2);
}

/* ============================================================
   Embed (live agent)
   ============================================================ */
.embed-shell {
  border: 1px solid var(--rule);
  background: var(--surface-sunk);
  box-shadow: var(--shadow);
  margin-top: 1.5rem;
}

.embed-bar {
  display: flex;
  align-items: center;
  gap: .6rem;
  border-bottom: 1px solid var(--rule);
  padding: .55rem .85rem;
  font-family: var(--ff-mono);
  font-size: var(--fs-xs);
  letter-spacing: .06em;
  color: var(--ink-3);
  background: var(--surface);
}
.embed-bar .dot { width: .55rem; height: .55rem; border-radius: 50%; background: var(--code); flex: none; }
.embed-bar .url { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.embed-bar a { margin-left: auto; color: var(--ink-2); white-space: nowrap; }

.embed-shell iframe { display: block; width: 100%; height: 46rem; border: 0; background: var(--ground); }

.embed-fallback { display: none; }

@media (max-width: 46rem) {
  .embed-shell { display: none; }
  .embed-fallback { display: block; }
}

/* ============================================================
   Transcript
   ============================================================ */
.trail { list-style: none; margin: 1rem 0 0; padding: 0; }
.trail li {
  display: flex; gap: .6rem; align-items: baseline;
  font-family: var(--ff-mono); font-size: var(--fs-sm);
  color: var(--ink-2); margin-bottom: .4rem;
}
.trail li::before { content: "✓"; color: var(--code); }

.answer {
  background: var(--surface);
  border: 1px solid var(--rule-soft);
  border-left: 3px solid var(--code);
  padding: 1.25rem 1.375rem;
  margin-top: 1.25rem;
}
.answer .badge {
  display: inline-block;
  font-family: var(--ff-mono); font-size: var(--fs-xs);
  letter-spacing: .12em; text-transform: uppercase;
  color: var(--code); border: 1px solid var(--code);
  padding: .25em .6em; margin-bottom: .9rem;
}
.answer p, .answer li { font-size: var(--fs-sm); color: var(--ink-2); max-width: none; }

.gaps {
  background: var(--surface);
  border: 1px solid var(--rule-soft);
  border-left: 3px solid var(--stop);
  padding: 1.25rem 1.375rem;
  margin-top: 1rem;
}
.gaps .badge {
  display: inline-block;
  font-family: var(--ff-mono); font-size: var(--fs-xs);
  letter-spacing: .12em; text-transform: uppercase;
  color: var(--stop); border: 1px solid var(--stop);
  padding: .25em .6em; margin-bottom: .9rem;
}
.gaps p, .gaps li { font-size: var(--fs-sm); color: var(--ink-2); max-width: none; }

/* ============================================================
   Contact
   ============================================================ */
.contact-list { list-style: none; margin: 2rem 0 0; padding: 0; max-width: 40rem; }

.contact-list li { border-top: 1px solid var(--rule); }
.contact-list li:last-child { border-bottom: 1px solid var(--rule); }

.contact-list a {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  padding: 1.125rem .25rem;
  text-decoration: none;
  transition: padding-left .15s ease;
}
.contact-list a:hover { padding-left: .75rem; }

.contact-list .label {
  font-family: var(--ff-mono);
  font-size: var(--fs-xs);
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--ink-3);
  flex: none;
  min-width: 6rem;
}
.contact-list .value { font-family: var(--ff-display); font-size: var(--fs-lg); }
.contact-list .go { margin-left: auto; color: var(--ink-3); font-family: var(--ff-mono); font-size: var(--fs-xs); }

/* ============================================================
   Footer
   ============================================================ */
.site-foot {
  border-top: 1px solid var(--rule);
  padding: 2.5rem 0 3.5rem;
  margin-top: 1rem;
}
.site-foot .wrap { display: flex; flex-wrap: wrap; gap: 1.5rem 2.5rem; align-items: flex-start; }
.site-foot nav { display: flex; flex-wrap: wrap; gap: 1rem 1.5rem; }
.site-foot a { color: var(--ink-2); font-size: var(--fs-sm); }
.site-foot .note { color: var(--ink-3); font-size: var(--fs-xs); font-family: var(--ff-mono); margin-left: auto; }

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 34rem) {
  .site-head .wrap { min-height: 0; }
  .site-nav { width: 100%; }
  .site-nav .btn { flex: 1; justify-content: center; }
  .hero h1 { max-width: none; }
  .contact-list a { padding-left: 0; }
  .contact-list .value { font-size: var(--fs-base); }
  .site-foot .note { margin-left: 0; width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; animation: none !important; }
}