/* Hallmark · macrostructure: Narrative Workflow · tone: technical · anchor hue: cobalt 262
 * genre: modern-minimal · theme: Cobalt · enrichment: real demo.gif capture · nav: N1b · footer: Ft5
 * audience: devs-first + team leads · use: star/explore repo
 * Hallmark · pre-emit critique: P4 H5 E4 S5 R5 V4
 */

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

html, body {
  margin: 0;
  overflow-x: clip;
}

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--color-ink);
  background: var(--color-paper);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 {
  font-family: var(--font-display);
  font-style: normal;
  font-weight: 700;
  letter-spacing: -0.025em;
  line-height: 1.08;
  margin: 0;
  overflow-wrap: anywhere;
  min-width: 0;
}

p { margin: 0; }
img { max-width: 100%; height: auto; display: block; }
code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: var(--color-paper-3);
  padding: 0.1em 0.35em;
  border-radius: var(--radius-sm);
}
pre code { background: none; padding: 0; }

.tnum { font-variant-numeric: tabular-nums; }
.muted { color: var(--color-ink-faint); font-size: var(--text-sm); }

/* skip link */
.skip {
  position: absolute;
  left: var(--space-md);
  top: -3rem;
  z-index: 600;
  background: var(--color-accent);
  color: var(--color-accent-ink);
  padding: var(--space-xs) var(--space-md);
  border-radius: var(--radius-sm);
}
.skip:focus-visible { top: var(--space-md); }

/* --- buttons + links: 8-state discipline --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2xs);
  font-family: var(--font-body);
  font-weight: 600;
  font-size: var(--text-sm);
  white-space: nowrap;
  line-height: 1;
  text-decoration: none;
  border: var(--rule-hair) solid transparent;
  border-radius: var(--radius-pill);
  padding: var(--space-xs) var(--space-lg);
  transition: transform var(--dur-micro) var(--ease-out), background var(--dur-micro) var(--ease-out);
}
.btn--accent {
  background: var(--color-accent);
  color: var(--color-accent-ink);
}
.btn--accent:hover { background: var(--color-accent-hover); transform: translateY(-1px); }
.btn--accent:active { transform: translateY(0); }
.btn--accent:focus-visible { outline: 2px solid var(--color-focus); outline-offset: 2px; }
.btn--lg { padding: var(--space-sm) var(--space-xl); font-size: var(--text-base); }
.btn[aria-disabled="true"] { opacity: 0.5; pointer-events: none; }

.link {
  color: var(--color-ink);
  font-weight: 500;
  white-space: nowrap;
  text-decoration: underline;
  text-decoration-color: var(--color-accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.25em;
  transition: color var(--dur-micro) var(--ease-out);
}
.link:hover { color: var(--color-accent); }
.link:active { color: var(--color-accent-hover); }
.link:focus-visible { outline: 2px solid var(--color-focus); outline-offset: 2px; border-radius: 2px; }

/* --- nav · N1b, frost on scroll --- */
.nav {
  position: fixed;
  inset: 0 0 auto;
  z-index: 500;
  background: transparent;
  border-bottom: var(--rule-hair) solid transparent;
  transition: background var(--dur-minor) var(--ease-out), border-color var(--dur-minor) var(--ease-out), box-shadow var(--dur-minor) var(--ease-out);
}
.nav.is-scrolled {
  background: color-mix(in oklch, var(--color-paper) 78%, transparent);
  backdrop-filter: blur(14px) saturate(150%);
  border-bottom-color: var(--color-rule);
  box-shadow: 0 8px 24px -18px var(--color-shadow);
}
.nav__inner {
  max-width: var(--page-max);
  margin: 0 auto;
  padding-inline: var(--page-gutter);
  height: 60px;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
}
.nav__brand {
  justify-self: start;
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: var(--text-sm);
  color: var(--color-ink);
  text-decoration: none;
  white-space: nowrap;
}
.nav__brand:focus-visible { outline: 2px solid var(--color-focus); outline-offset: 2px; border-radius: 2px; }
.nav__center { justify-self: center; display: flex; gap: var(--space-xs); }
.nav__link {
  color: var(--color-ink-muted);
  font-size: var(--text-sm);
  font-weight: 500;
  text-decoration: none;
  white-space: nowrap;
  padding: var(--space-2xs) var(--space-sm);
  border-radius: var(--radius-sm);
  transition: color var(--dur-micro) var(--ease-out), background var(--dur-micro) var(--ease-out);
}
.nav__link:hover { color: var(--color-ink); background: var(--color-paper-2); }
.nav__link:active { background: var(--color-paper-3); }
.nav__link:focus-visible { outline: 2px solid var(--color-focus); outline-offset: 1px; }
.nav__right { justify-self: end; }

/* --- hero · H2 split diptych --- */
.hero {
  max-width: var(--page-max);
  margin: 0 auto;
  padding: calc(60px + var(--space-xl)) var(--page-gutter) var(--space-3xl);
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  gap: var(--space-2xl);
  align-items: center;
}
.hero__copy h1 { font-size: var(--text-display); max-width: 14ch; }
.hero__lede {
  margin-top: var(--space-lg);
  font-size: var(--text-md);
  color: var(--color-ink-muted);
  max-width: 52ch;
}
.hero__ctas {
  margin-top: var(--space-xl);
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  flex-wrap: wrap;
}
.hero__proof { margin: 0; min-width: 0; }
.hero__proof img {
  border: var(--rule-hair) solid var(--color-rule);
  border-radius: var(--radius-md);
}
.hero__proof figcaption {
  margin-top: var(--space-xs);
  font-size: var(--text-xs);
  color: var(--color-ink-faint);
}

/* --- stat strip · T4 --- */
.stats {
  max-width: var(--page-max);
  margin: 0 auto;
  padding: var(--space-xl) var(--page-gutter);
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border-block: var(--rule-hair) solid var(--color-rule);
}
.stats > div {
  padding-inline: var(--space-lg);
  border-left: var(--rule-hair) solid var(--color-rule);
  opacity: 0;
  transform: translateY(8px);
  transition: opacity var(--dur-major) var(--ease-out), transform var(--dur-major) var(--ease-out);
}
.stats > div.is-in { opacity: 1; transform: none; }
.stats > div:first-child { border-left: none; padding-inline-start: 0; }
.stats b {
  display: block;
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: var(--text-2xl);
  letter-spacing: -0.02em;
}
.stats span { color: var(--color-ink-muted); font-size: var(--text-sm); }

/* --- section heads · S2 hanging --- */
.head-hang {
  padding-block: var(--space-3xl) var(--space-xl);
  max-width: 40rem;
}
.head-hang h2 { font-size: var(--text-3xl); }
.head-hang p { margin-top: var(--space-sm); color: var(--color-ink-muted); font-size: var(--text-md); }

/* --- stages · F4 step sequence --- */
.stages, .limits, .start, .who {
  max-width: var(--page-max);
  margin: 0 auto;
  padding-inline: var(--page-gutter);
}
.steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-2xl);
}
.step {
  border-top: var(--rule-thick) solid var(--color-ink);
  padding-top: var(--space-lg);
  max-width: 44rem;
  opacity: 0;
  transform: translateY(12px);
  transition: opacity var(--dur-major) var(--ease-out), transform var(--dur-major) var(--ease-out);
}
.step.is-in { opacity: 1; transform: none; }
.step:nth-child(even) { margin-left: auto; }
.stage {
  display: block;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: var(--text-sm);
  color: var(--color-accent);
  margin-bottom: var(--space-xs);
}
.step h3 { font-size: var(--text-xl); }
.step p { margin-top: var(--space-sm); color: var(--color-ink-muted); max-width: 62ch; }
.gate-list {
  margin: var(--space-md) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: var(--space-sm);
}
.gate-list li {
  padding-left: var(--space-lg);
  position: relative;
  color: var(--color-ink-muted);
}
.gate-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 1px;
  background: var(--color-accent);
}
.gate-list b { color: var(--color-ink); font-weight: 600; }

/* --- honest limits --- */
.limits__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-md) var(--space-xl);
  max-width: 56rem;
}
.limits__list li {
  border-left: var(--rule-thick) solid var(--color-rule-strong);
  padding-left: var(--space-md);
  color: var(--color-ink-muted);
  font-size: var(--text-sm);
}

/* --- quick start --- */
.start__block { margin-bottom: var(--space-lg); max-width: 56rem; }
.start__label {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-ink-faint);
  margin-bottom: var(--space-xs);
}
.start__then { margin: var(--space-xl) 0 var(--space-xs); color: var(--color-ink-muted); }
.codewrap {
  position: relative;
  max-width: 56rem;
  background: var(--color-code-bg);
  border-radius: var(--radius-md);
}
.codewrap pre {
  margin: 0;
  padding: var(--space-md) var(--space-lg);
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  line-height: 1.7;
  color: var(--color-code-ink);
}
.copybtn {
  position: absolute;
  top: var(--space-xs);
  right: var(--space-xs);
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 600;
  white-space: nowrap;
  color: var(--color-code-ink);
  background: var(--color-code-bg-2);
  border: var(--rule-hair) solid var(--color-code-rule);
  border-radius: var(--radius-sm);
  padding: var(--space-2xs) var(--space-sm);
  line-height: 1.4;
  cursor: pointer;
  transition: background var(--dur-micro) var(--ease-out), transform var(--dur-micro) var(--ease-out);
}
.copybtn:hover { background: var(--color-code-bg-3); }
.copybtn:active { transform: translateY(1px); }
.copybtn:focus-visible { outline: 2px solid var(--color-focus); outline-offset: 2px; }
.copybtn:disabled { opacity: 0.5; cursor: default; }
.copybtn[data-state="success"] { color: var(--color-success-ink); border-color: var(--color-success-rule); }
.copybtn[data-state="error"] { color: var(--color-error-ink); border-color: var(--color-error-rule); }

/* --- who --- */
.who__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-xl);
  max-width: 56rem;
}
.who__grid article {
  border: var(--rule-hair) solid var(--color-rule);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  background: var(--color-paper-2);
}
.who__grid h3 { font-size: var(--text-lg); }
.who__grid p { margin-top: var(--space-sm); color: var(--color-ink-muted); font-size: var(--text-sm); }

/* --- closing CTA --- */
.closing {
  max-width: var(--page-max);
  margin: 0 auto;
  padding: var(--space-3xl) var(--page-gutter);
  display: grid;
  gap: var(--space-lg);
  justify-items: start;
}
.closing__line {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  letter-spacing: -0.02em;
  line-height: 1.15;
  max-width: 24ch;
}

/* --- footer · Ft5 statement --- */
.foot-stmt {
  max-width: var(--page-max);
  margin: 0 auto;
  padding: var(--space-2xl) var(--page-gutter) var(--space-xl);
  display: grid;
  gap: var(--space-lg);
}
.foot-stmt__line {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 5vw, 3.25rem);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.02em;
  max-width: 22ch;
  overflow-wrap: anywhere;
  min-width: 0;
}
.foot-stmt__meta {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: var(--space-md);
  flex-wrap: wrap;
  padding-block-start: var(--space-sm);
  border-top: var(--rule-hair) solid var(--color-rule);
}
.foot-stmt__mark { font-family: var(--font-mono); font-size: var(--text-sm); }
.foot-stmt__links { display: flex; gap: var(--space-lg); }
.foot-stmt__links .link { font-size: var(--text-sm); }

/* --- responsive --- */
@media (max-width: 56rem) {
  .hero { grid-template-columns: 1fr; padding-top: calc(60px + var(--space-xl)); }
  .hero__copy h1 { max-width: none; }
  .nav__center { display: none; }
  .stats { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--space-lg) 0; }
  .stats > div:nth-child(odd) { border-left: none; padding-inline-start: 0; }
  .stats > div:nth-child(even) { padding-inline-end: 0; }
  .step:nth-child(even) { margin-left: 0; }
  .limits__list, .who__grid { grid-template-columns: 1fr; }
  .head-hang { padding-block: var(--space-2xl) var(--space-lg); }
}

/* --- reduced motion: spatial motion collapses to quick fades --- */
@media (prefers-reduced-motion: reduce) {
  .stats > div, .step {
    transform: none;
    transition: opacity 150ms var(--ease-out);
  }
  .btn--accent:hover, .copybtn:active { transform: none; }
  .nav { transition: none; }
}