/* adoptai.studio — site styles. No external requests: system fonts only. */
/* LOCKED 2026-07-24 — operator has signed off on this look (font stack,
   color tokens, background, shadows/spacing system below). Do not change
   any of these design decisions unless explicitly asked to. Structural/
   content edits (new pages, new components) are fine — match the existing
   tokens rather than introducing new ones. Full record:
   docs/website-design-system.md */

:root {
  --ink: #1a2332;
  --ink-soft: #4d5972;
  --paper: #fbfaf7;
  --card: #ffffff;
  --wash: #f2f0ea;
  --line: #e3e0d8;
  --accent: #0f6b5c;      /* deep teal-green */
  --accent-dark: #0b5347;
  --accent-soft: #e7f2ef;
  --amber: #b9741a;       /* citation / highlight */
  --amber-soft: #fdf3e3;
  --max: 62rem;
  --radius: 14px;
  --radius-sm: 8px;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  --shadow-sm: 0 1px 2px rgba(26, 35, 50, .06), 0 1px 1px rgba(26, 35, 50, .05);
  --shadow-md: 0 10px 24px -8px rgba(26, 35, 50, .18), 0 2px 8px rgba(26, 35, 50, .07);
  --shadow-lift: 0 20px 44px -14px rgba(26, 35, 50, .26);
  --chrome-strip: rgba(20, 30, 25, .025);
}
@media (prefers-color-scheme: dark) {
  :root {
    --ink: #e8eaf0;
    --ink-soft: #a8b0c2;
    --paper: #12161f;
    --card: #1a2029;
    --wash: #191f29;
    --line: #2a3140;
    --accent: #4fbfa4;
    --accent-dark: #3ea78e;
    --accent-soft: #16302b;
    --amber: #e0a24a;
    --amber-soft: #33270f;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, .35);
    --shadow-md: 0 10px 24px -8px rgba(0, 0, 0, .5), 0 2px 8px rgba(0, 0, 0, .35);
    --shadow-lift: 0 20px 44px -14px rgba(0, 0, 0, .6);
    --chrome-strip: rgba(255, 255, 255, .03);
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.65;
  font-size: 1.0625rem;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; }
a { color: var(--accent); }
h1, h2, h3 { font-weight: 700; }

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 1.25rem; }

/* Header */
header.site {
  border-bottom: 1px solid var(--line);
  background: var(--paper);
  position: sticky; top: 0; z-index: 10;
  box-shadow: 0 1px 0 rgba(26, 35, 50, .02);
}
header.site .wrap {
  display: flex; align-items: center; justify-content: space-between;
  padding-top: .85rem; padding-bottom: .85rem; gap: 1rem;
}
.wordmark {
  font-family: var(--font-body);
  font-weight: 700; letter-spacing: -0.02em; text-decoration: none;
  color: var(--ink); font-size: 1.18rem; white-space: nowrap;
}
.wordmark span { color: var(--accent); }
nav.main { display: flex; gap: 1.3rem; flex-wrap: wrap; }
nav.main a {
  position: relative;
  text-decoration: none; color: var(--ink-soft); font-size: .95rem;
  padding-bottom: .2rem;
}
nav.main a::after {
  content: ""; position: absolute; left: 0; right: 100%; bottom: -1px;
  height: 2px; background: var(--accent); border-radius: 2px;
  transition: right .18s ease;
}
nav.main a:hover { color: var(--accent); }
nav.main a:hover::after, nav.main a[aria-current="page"]::after { right: 0; }
nav.main a[aria-current="page"] { color: var(--accent); }

/* Hero */
.hero {
  padding: 4.5rem 0 3rem;
  background:
    radial-gradient(60rem 26rem at 12% -15%, var(--accent-soft), transparent 60%);
}
.hero h1 {
  font-size: clamp(2rem, 4.4vw, 3.1rem);
  line-height: 1.14; letter-spacing: -0.01em; margin: 0 0 1.1rem;
  max-width: 22ch;
}
.hero p.lead {
  font-size: 1.2rem; color: var(--ink-soft); max-width: 46ch; margin: 0 0 1.8rem;
}
.hero-grid {
  display: grid; grid-template-columns: 1fr 2fr; gap: 3rem; align-items: center;
}
@media (max-width: 60rem) {
  .hero-grid { grid-template-columns: 1fr; gap: 2rem; }
}
.hero-image {
  width: 100%; height: auto; display: block;
  border-radius: var(--radius); box-shadow: var(--shadow-lift);
}

/* Buttons */
.btn {
  display: inline-block; padding: .75rem 1.4rem; border-radius: 999px;
  text-decoration: none; font-weight: 600; font-size: 1rem;
  border: 1.5px solid var(--accent);
  transition: transform .15s ease, box-shadow .15s ease, filter .15s ease, background .15s ease;
}
.btn.primary {
  background: var(--accent); color: #fff;
  box-shadow: 0 1px 2px rgba(15, 107, 92, .3), 0 6px 16px -6px rgba(15, 107, 92, .4);
}
.btn.primary:hover { filter: brightness(1.06); transform: translateY(-1px); box-shadow: 0 2px 4px rgba(15, 107, 92, .32), 0 10px 22px -6px rgba(15, 107, 92, .48); }
.btn.primary:active { transform: translateY(0); }
.btn.ghost { color: var(--accent); background: transparent; margin-left: .6rem; border-color: var(--line); }
.btn.ghost:hover { background: var(--accent-soft); border-color: var(--accent); transform: translateY(-1px); }

/* Sections */
section { padding: 3.2rem 0; }
section.alt { background: var(--card); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
h2 { font-size: 1.75rem; letter-spacing: -0.01em; margin: 0 0 .5rem; }
.kicker {
  font-family: var(--font-body);
  text-transform: uppercase; letter-spacing: .1em; font-size: .78rem;
  font-weight: 700; color: var(--accent); margin: 0 0 .6rem;
}
p.sub { color: var(--ink-soft); max-width: 60ch; margin-top: 0; }

/* Cards */
.grid { display: grid; gap: 1.2rem; grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr)); margin-top: 1.6rem; }
.card {
  position: relative;
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 1.5rem 1.5rem 1.4rem;
  box-shadow: var(--shadow-sm);
  transition: transform .18s ease, box-shadow .18s ease;
  overflow: hidden;
}
.card::before {
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: var(--accent); opacity: .5;
}
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }
section.alt .card { background: var(--paper); }
.card h3 { margin: 0 0 .45rem; font-size: 1.1rem; }
.card p { margin: 0; color: var(--ink-soft); font-size: .98rem; }

/* Chat / answer device-style vignettes */
.chat, .answer {
  position: relative;
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 2.6rem 1.35rem 1.3rem;
  box-shadow: var(--shadow-md);
  max-width: 34rem;
  font-size: .97rem;
}
.answer { max-width: 36rem; }
.chat::before, .answer::before {
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 2.35rem;
  background: var(--chrome-strip);
  border-bottom: 1px solid var(--line);
  border-radius: var(--radius) var(--radius) 0 0;
}
.chat::after, .answer::after {
  content: ""; position: absolute; top: 1rem; left: 1.3rem;
  width: .5rem; height: .5rem; border-radius: 50%;
  background: #e0645c;
  box-shadow: 1rem 0 0 #e8b23d, 2rem 0 0 #3fae5a;
}

/* The message-exchange vignette always renders as a light-mode phone
   screenshot — real chat apps don't retint to the visitor's OS theme. */
.chat {
  background: #ffffff; border-color: #e3e0d8; color: #1a2332;
}
.chat::before { background: rgba(20, 30, 25, .025); border-bottom-color: #e3e0d8; }
.chat .msg { margin: .6rem 0; }
.chat .who { font-weight: 700; font-size: .8rem; color: #4d5972; display: block; }
.chat .time { color: #4d5972; font-size: .78rem; margin-left: .4rem; font-weight: 400; }
.chat .bubble {
  display: inline-block; padding: .5rem .85rem; border-radius: 10px;
  background: #e7f2ef; margin-top: .15rem; color: #1a2332;
}
.chat .bubble.owner { background: #fdf3e3; }
.answer .q { font-weight: 650; margin: 0 0 .7rem; font-size: 1.05rem; }
.answer .a { margin: 0 0 .8rem; }
.cite {
  display: inline-block; background: var(--amber-soft); color: var(--amber);
  border-radius: 999px; padding: .18rem .75rem; font-size: .8rem; font-weight: 650;
}
.note { font-size: .85rem; color: var(--ink-soft); }

/* Steps — connected timeline */
ol.steps { counter-reset: step; list-style: none; padding: 0; margin: 1.8rem 0 0; display: grid; gap: 1rem; position: relative; }
ol.steps li {
  counter-increment: step; background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 1.05rem 1.3rem 1.05rem 3.6rem; position: relative;
  box-shadow: var(--shadow-sm);
}
section.alt ol.steps li { background: var(--paper); }
ol.steps li::before {
  content: counter(step); position: absolute; left: 1.05rem; top: 1.05rem;
  width: 1.8rem; height: 1.8rem; border-radius: 50%;
  background: var(--accent); color: #fff; font-weight: 700; font-size: .95rem;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-body);
  z-index: 1;
}
ol.steps li:not(:last-child)::after {
  content: ""; position: absolute; left: 1.95rem; top: 2.85rem; bottom: -1rem;
  width: 2px; background: var(--line);
}
ol.steps b { display: block; margin-bottom: .2rem; }
ol.steps p { margin: 0; color: var(--ink-soft); font-size: .96rem; }

/* Never list */
ul.never { list-style: none; padding: 0; margin: 1.5rem 0 0; display: grid; gap: .55rem; grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr)); }
ul.never li {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius-sm);
  padding: .65rem .95rem; font-size: .95rem; color: var(--ink-soft);
  transition: background .15s ease, border-color .15s ease;
}
ul.never li:hover { background: var(--amber-soft); border-color: var(--amber); }
ul.never li::before { content: "✕ "; color: var(--amber); font-weight: 700; }

/* Connected list — same shape as the never list, opposite sign.
   Reuses the locked accent tokens; no new colours introduced. */
ul.connected { list-style: none; padding: 0; margin: 1.5rem 0 0; display: grid; gap: .55rem; grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr)); }
ul.connected li {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius-sm);
  padding: .65rem .95rem; font-size: .95rem; color: var(--ink-soft);
  transition: background .15s ease, border-color .15s ease;
}
ul.connected li:hover { background: var(--accent-soft); border-color: var(--accent); }
ul.connected li::before { content: "→ "; color: var(--accent); font-weight: 700; }
section.alt ul.connected li, section.alt ul.never li { background: var(--paper); }

/* Diagrams — inline SVG inherits the locked tokens, so light/dark adapt
   automatically and no new colours are introduced. */
figure.diagram {
  margin: 1.8rem 0 0; padding: 1.4rem 1.2rem 1.1rem;
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); box-shadow: var(--shadow-sm);
}
section.alt figure.diagram { background: var(--paper); }
figure.diagram svg { display: block; width: 100%; height: auto; }
figure.diagram figcaption {
  margin-top: .9rem; font-size: .86rem; color: var(--ink-soft); text-align: center;
}
.dg-label { font-size: 11px; font-weight: 600; fill: var(--ink); }
.dg-muted { font-size: 10px; fill: var(--ink-soft); font-weight: 400; }
.dg-box { fill: var(--paper); stroke: var(--line); stroke-width: 1.5; }
section.alt .dg-box { fill: var(--card); }
.dg-hub { fill: var(--accent-soft); stroke: var(--accent); stroke-width: 2; }
.dg-line { stroke: var(--line); stroke-width: 1.5; fill: none; }
.dg-flow { stroke: var(--accent); stroke-width: 2; fill: none; }
.dg-warn { stroke: var(--amber); stroke-width: 1.5; fill: none; }
.dg-warn-fill { fill: var(--amber-soft); stroke: var(--amber); stroke-width: 1.5; }
.dg-accent { fill: var(--accent); }
.dg-on-accent { fill: var(--accent-dark); font-size: 11px; font-weight: 700; }

/* Calculator inputs — locked tokens only, no new colours */
.calc-grid { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fit, minmax(17rem, 1fr)); margin-top: 1.4rem; }
.calc-grid label {
  display: flex; flex-direction: column; gap: .35rem;
  font-weight: 650; font-size: .95rem; color: var(--ink);
}
.calc-grid label span { font-weight: 400; font-size: .84rem; color: var(--ink-soft); }
.calc-grid input {
  font: inherit; font-weight: 400; color: var(--ink); background: var(--card);
  border: 1px solid var(--line); border-radius: var(--radius-sm);
  padding: .55rem .7rem; width: 100%; margin-top: .15rem;
  transition: border-color .15s ease, box-shadow .15s ease;
}
.calc-grid input:focus {
  outline: none; border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
#result h3 { margin-top: 2rem; }

/* Tables */
table {
  border-collapse: separate; border-spacing: 0; width: 100%; margin-top: 1.5rem; font-size: .97rem;
  border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden;
}
.table-scroll { overflow-x: auto; border-radius: var(--radius); }
th, td { text-align: left; padding: .7rem .9rem; border-bottom: 1px solid var(--line); vertical-align: top; }
th {
  font-size: .8rem; text-transform: uppercase; letter-spacing: .06em; color: var(--ink-soft);
  background: var(--wash); font-weight: 700;
}
tr:last-child td { border-bottom: none; }
tr:hover td { background: var(--accent-soft); }

/* Prose pages */
.prose { max-width: 44rem; }
.prose h2 { margin-top: 2.6rem; }
.prose h3 { margin-top: 1.9rem; margin-bottom: .3rem; }
.prose blockquote {
  margin: 1.5rem 0; padding: 1rem 1.3rem; border-left: 4px solid var(--accent);
  background: var(--card); border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--ink-soft); font-style: italic; font-size: 1.06rem;
  box-shadow: var(--shadow-sm);
}

/* CTA band */
.cta-band {
  text-align: center; padding: 3.6rem 2rem; margin: 1rem 0 2.5rem;
  border-radius: var(--radius);
  background: linear-gradient(180deg, var(--accent-soft), transparent);
}
.cta-band h2 { font-size: 1.95rem; }

/* Footer */
footer.site {
  border-top: 1px solid var(--line); padding: 2.2rem 0 3rem;
  color: var(--ink-soft); font-size: .9rem;
}
footer.site .wrap { display: flex; flex-wrap: wrap; gap: 1rem; justify-content: space-between; }
footer.site a { color: var(--ink-soft); }

@media (max-width: 40rem) {
  nav.main { gap: .85rem; font-size: .9rem; }
  .hero { padding-top: 3rem; }
  .btn.ghost { margin-left: 0; margin-top: .6rem; }
}