/* ============================================================
   Vertelligence — tokens from style guide v0.1
   ============================================================ */
:root {
  --vt-green-logo:   #56B40E;
  --vt-green-bright: #9FE870;
  --vt-green-soft:   #6FB238;
  --vt-green-text:   #3D7A0A;
  --vt-forest:       #163300;
  --vt-white:        #FFFFFF;
  --vt-mist:         #F6FAF2;
  --vt-border:       #D4E0CC;
  --vt-muted:        #5B6B52;

  --vt-code-bg:      #0F1A0A;
  --vt-code-fg:      #E3EBDD;
  --vt-code-comment: #8FA386;
  --vt-code-keyword: #9FE870;
  --vt-code-string:  #F2C66D;
  --vt-code-number:  #7CC4E0;

  --vt-font-sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --vt-font-mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;

  --radius: 10px;
  --wrap: 1120px;
}

/* ---------- Base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 72px; }
body {
  margin: 0;
  font: 400 16px/1.6 var(--vt-font-sans);
  color: var(--vt-forest);
  background: var(--vt-white);
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
h1, h2, h3 { line-height: 1.15; margin: 0 0 16px; letter-spacing: -0.02em; }
h1 { font-size: clamp(2.2rem, 5vw, 3.4rem); font-weight: 700; }
h2 { font-size: clamp(1.7rem, 3.5vw, 2.4rem); font-weight: 700; margin-bottom: 40px; }
h3 { font-size: 1.15rem; font-weight: 600; letter-spacing: -0.01em; }
p  { margin: 0 0 16px; }
a  { color: var(--vt-green-text); }

.wrap { max-width: var(--wrap); margin: 0 auto; padding-inline: 24px; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip-link { position: absolute; left: -9999px; top: 8px; z-index: 100; background: var(--vt-forest); color: var(--vt-white); padding: 8px 12px; border-radius: 6px; }
.skip-link:focus { left: 8px; }
:focus-visible { outline: 2px solid var(--vt-green-text); outline-offset: 2px; }

.eyebrow {
  font: 600 0.8rem/1 var(--vt-font-mono);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--vt-green-text);
  margin-bottom: 14px;
}

/* ---------- Buttons ---------- */
.vt-btn {
  display: inline-block;
  font: 600 15px/1 var(--vt-font-sans);
  padding: 14px 20px;
  border-radius: 8px;
  text-decoration: none;
  border: 1.5px solid transparent;
  transition: transform .15s ease, background-color .15s ease;
}
.vt-btn:hover { transform: translateY(-1px); }
.vt-btn--sm { padding: 9px 14px; font-size: 14px; }
.vt-btn--primary { background: var(--vt-green-bright); color: var(--vt-forest); border-color: var(--vt-forest); }
.vt-btn--dark { background: var(--vt-forest); color: var(--vt-white); }
.vt-btn--dark:hover { background: #224a04; }
.vt-btn--ghost { background: transparent; color: var(--vt-forest); border-color: var(--vt-forest); }
.vt-btn--outline-dark { background: transparent; color: var(--vt-forest); border-color: var(--vt-forest); }

/* ---------- Header (style guide §3) ---------- */
.vt-header {
  position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 12px 24px;
  background: rgba(246, 250, 242, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--vt-border);
}
.vt-header__brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--vt-forest); }
.vt-header__brand img { height: 32px; width: auto; }
.vt-header__name { font-weight: 700; font-size: 17px; letter-spacing: -0.01em; }
.vt-header__links { display: flex; align-items: center; gap: 22px; }
.vt-header__links a:not(.vt-btn) { color: var(--vt-forest); text-decoration: none; font-size: 14px; font-weight: 600; }
.vt-header__links a:not(.vt-btn):hover { color: var(--vt-green-text); text-decoration: underline; }

.vt-header__toggle { display: none; background: none; border: 0; padding: 8px; cursor: pointer; }
.vt-header__toggle .bar { display: block; width: 22px; height: 2px; margin: 4px 0; background: var(--vt-forest); transition: transform .2s, opacity .2s; }
.vt-header__toggle[aria-expanded="true"] .bar:nth-child(2) { transform: translateY(6px) rotate(45deg); }
.vt-header__toggle[aria-expanded="true"] .bar:nth-child(3) { opacity: 0; }
.vt-header__toggle[aria-expanded="true"] .bar:nth-child(4) { transform: translateY(-6px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero { background: var(--vt-green-bright); padding-block: 80px 88px; }
.hero__grid { display: grid; grid-template-columns: 1.1fr 1fr; gap: 56px; align-items: center; }
.hero .eyebrow { color: var(--vt-forest); }
.hero__byline { font-size: 1.15rem; font-weight: 600; margin-top: 20px; }
.hero__lede { font-size: 1.05rem; max-width: 52ch; }
.hero__cta { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }

/* Flow diagram */
.flow {
  display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: 14px;
  background: var(--vt-white);
  border: 1.5px solid var(--vt-forest);
  border-radius: 16px;
  padding: 24px 20px;
  box-shadow: 8px 8px 0 var(--vt-forest);
}
.flow__col { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.flow__col li {
  font-size: 12.5px; font-weight: 600; line-height: 1.3;
  background: var(--vt-mist); border: 1px solid var(--vt-border);
  padding: 8px 10px; border-radius: 6px; position: relative;
}
.flow__col:first-child li::after,
.flow__col:last-child li::before {
  content: ""; position: absolute; top: 50%; width: 14px; height: 1.5px; background: var(--vt-green-soft);
}
.flow__col:first-child li::after { right: -15px; }
.flow__col:last-child li::before { left: -15px; }
.flow__hub {
  display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center;
  width: 108px; min-height: 160px; padding: 12px;
  background: var(--vt-forest); color: var(--vt-white); border-radius: 12px;
}
.flow__hub-name { font: 600 16px var(--vt-font-mono); color: var(--vt-green-bright); }
.flow__hub-sub { font-size: 11px; line-height: 1.3; margin-top: 6px; opacity: .9; }

/* ---------- Sections ---------- */
.section { padding-block: 96px; }
.section--mist { background: var(--vt-mist); border-block: 1px solid var(--vt-border); }
.section--green { background: var(--vt-green-bright); }
.section--green .eyebrow { color: var(--vt-forest); }

.card {
  background: var(--vt-white);
  border: 1px solid var(--vt-border);
  border-radius: var(--radius);
  padding: 28px 24px;
}
.card p { color: var(--vt-muted); margin: 0; }

/* How it works */
.steps { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.step-num { display: block; font: 600 13px var(--vt-font-mono); color: var(--vt-green-text); margin-bottom: 18px; }
.steps .card {
  border-top: 4px solid var(--vt-green-soft);
  transition: transform .25s ease, box-shadow .25s ease, background-color .25s ease, border-color .25s ease;
}
.steps .card:hover {
  background: #F3FAEC;
  border-color: #C4DDB0;
  border-top-color: var(--vt-green-logo);
  transform: translateY(-6px) perspective(800px) rotateX(3deg);
  box-shadow:
    0 1px 0 #C4DDB0,
    0 10px 20px -8px rgba(22, 51, 0, 0.18),
    0 24px 40px -16px rgba(86, 180, 14, 0.25);
}

/* See it in action */
.demo { margin-top: 88px; }
.demo__title { font-size: clamp(1.3rem, 2.4vw, 1.6rem); font-weight: 700; max-width: 32ch; margin-bottom: 28px; }
.demo__grid { display: grid; grid-template-columns: 2fr 1fr; gap: 24px; align-items: stretch; }
.demo__video { margin: 0; min-width: 0; }
.demo__frame {
  position: relative; aspect-ratio: 16 / 9; max-width: 100%;
  border-radius: var(--radius); overflow: hidden;
  background: var(--vt-code-bg);
  border: 1.5px solid var(--vt-forest);
  box-shadow: 6px 6px 0 var(--vt-forest);
}
.demo__frame iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }
.demo__video figcaption { margin-top: 14px; font-size: 14px; font-weight: 600; }
.demo__soon { display: grid; }
.demo__soon-card {
  display: flex; flex-direction: column; justify-content: center; gap: 12px;
  padding: 28px 24px; border-radius: var(--radius);
  border: 1.5px dashed var(--vt-border); background: var(--vt-mist);
}
.demo__soon-card p { margin: 0; color: var(--vt-muted); }
.demo__soon-tag {
  align-self: flex-start;
  font: 600 12px var(--vt-font-mono); text-transform: uppercase; letter-spacing: .06em;
  color: var(--vt-forest); background: var(--vt-green-bright);
  padding: 4px 8px; border-radius: 4px;
}

.glimpse { display: grid; grid-template-columns: 1fr 1.2fr; gap: 48px; align-items: center; margin-top: 72px; }
.glimpse__text p { color: var(--vt-muted); max-width: 46ch; }
.glimpse__code { margin: 0; min-width: 0; }
.glimpse__code figcaption { font: 600 12px var(--vt-font-mono); color: var(--vt-muted); margin-bottom: 8px; text-transform: uppercase; letter-spacing: .06em; }

/* Code viewing (style guide §5) */
.vt-code {
  margin: 0;
  background: var(--vt-code-bg);
  color: var(--vt-code-fg);
  font: 13px/1.7 var(--vt-font-mono);
  padding: 20px 22px;
  border-radius: var(--radius);
  overflow-x: auto;
  tab-size: 2;
}
.vt-code .c { color: var(--vt-code-comment); }
.vt-code .k { color: var(--vt-code-keyword); }
.vt-code .s { color: var(--vt-code-string); }
.vt-code .n { color: var(--vt-code-number); }

/* Library (dark section, uses code-viewing palette) */
.section--dark { background: var(--vt-code-bg); color: var(--vt-code-fg); }
.section--dark .eyebrow { color: var(--vt-green-bright); }
.library { display: grid; grid-template-columns: 1.2fr 1fr; gap: 56px; align-items: center; }
.library h2 { margin-bottom: 20px; }
.library__lede { font-size: 1.05rem; max-width: 52ch; }
.library__points { list-style: none; padding: 0; margin: 24px 0 0; display: grid; gap: 10px; }
.library__points li { padding-left: 22px; position: relative; }
.library__points li::before { content: ""; position: absolute; left: 0; top: .6em; width: 10px; height: 10px; border-radius: 2px; background: var(--vt-green-bright); }
.library__points strong { color: var(--vt-white); }
.library__templates { background: #16240F; border: 1px solid #2A3B21; border-radius: 16px; padding: 28px; }
.library__label { font: 600 12px var(--vt-font-mono); text-transform: uppercase; letter-spacing: .08em; color: var(--vt-code-comment); }
.chips { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.chips li { display: flex; align-items: center; gap: 14px; padding: 12px 14px; border-radius: 8px; background: var(--vt-code-bg); border: 1px solid #2A3B21; font-size: 14px; }
.chip__code { flex: none; min-width: 58px; text-align: center; font: 600 13px var(--vt-font-mono); color: var(--vt-forest); background: var(--vt-green-bright); padding: 4px 8px; border-radius: 4px; }
.library__note { margin: 16px 0 0; font-size: 13px; color: var(--vt-code-comment); }

/* Services */
.services { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.services .card h3::before {
  content: ""; display: block; width: 28px; height: 28px; margin-bottom: 18px;
  border-radius: 6px; background: var(--vt-green-bright); border: 1.5px solid var(--vt-forest);
}

/* About */
.about { display: grid; grid-template-columns: 1fr 2fr; gap: 56px; }
.about h2 { margin-bottom: 6px; }
.about__role { color: var(--vt-muted); font-weight: 600; }
.about__lead { font-size: 1.35rem; font-weight: 600; line-height: 1.35; }
.about__body > p:not(.about__lead) { color: var(--vt-muted); font-size: 1.05rem; }
.creds { list-style: none; padding: 0; margin: 24px 0 0; display: flex; flex-wrap: wrap; gap: 10px; }
.creds li {
  font-size: 14px; font-weight: 600;
  padding: 8px 14px; border-radius: 999px;
  background: var(--vt-mist); border: 1px solid var(--vt-border);
}

/* Engage */
.engage { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.engage__item { background: var(--vt-white); border: 1.5px solid var(--vt-forest); border-radius: var(--radius); padding: 24px; }
.engage__item p { margin: 0; }
.contact__cta { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 40px; }

/* Footer */
.footer { background: var(--vt-forest); color: var(--vt-mist); padding-block: 32px; font-size: 14px; }
.footer__inner { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px 24px; }
.footer p { margin: 0; }
.footer__byline { opacity: .8; }

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
  .hero__grid, .glimpse, .about, .library { grid-template-columns: 1fr; gap: 40px; }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .services, .engage, .demo__grid { grid-template-columns: 1fr; }
}

@media (max-width: 760px) {
  .vt-header { padding: 10px 16px; flex-wrap: wrap; }
  .vt-header__toggle { display: block; }
  .vt-header__links {
    display: none; width: 100%;
    flex-direction: column; align-items: flex-start; gap: 4px;
    padding: 8px 0 12px;
  }
  .vt-header__links.is-open { display: flex; }
  .vt-header__links a:not(.vt-btn) { padding: 8px 0; font-size: 16px; }
  .vt-header__links .vt-btn { margin-top: 8px; }

  .wrap { padding-inline: 16px; }
  .hero { padding-block: 56px 64px; }
  .section { padding-block: 64px; }
  .steps { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .flow { grid-template-columns: 1fr; box-shadow: 5px 5px 0 var(--vt-forest); }
  .flow__col li::after, .flow__col li::before { display: none; }
  .flow__hub { width: 100%; min-height: 0; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .vt-btn, .steps .card { transition: none; }
  .vt-btn:hover, .steps .card:hover { transform: none; }
}