/*
 * varnir.site homepage.
 *
 * Deliberately dark-only. `apps/scanner-web` is a token-driven app with a
 * real light/dark/system toggle because people work in it all day; this is
 * a single marketing page with one committed visual identity, and a
 * half-hearted light variant of a design built on glowing gradients over a
 * near-black ground reads worse than not offering one. `color-scheme: dark`
 * is declared so browser UI (scrollbars, form controls) matches rather than
 * flashing white.
 *
 * The accent hues are the same family as scanner-web's design tokens
 * (indigo primary, cyan/emerald/amber signals) so the two sites read as one
 * product, just pitched brighter here.
 */

:root {
  --ink: #f2f4fb;
  --ink-soft: #b5bcd4;
  --ink-mute: #7d859f;
  --ink-faint: #565d76;

  --bg: #07080d;
  --bg-raise: #0d0f18;
  --bg-tint: #0a0c14;
  --edge: #1e2233;
  --edge-soft: #171a28;

  --indigo: #7b86ff;
  --cyan: #22d3ee;
  --violet: #a855f7;
  --emerald: #34d399;
  --amber: #fbbf24;

  --shell: 1140px;
  --radius: 16px;

  --font: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Inter, Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;

  color-scheme: dark;
}

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

html {
  scroll-behavior: smooth;
  /* The sticky topbar would otherwise cover an anchored heading. */
  scroll-padding-top: 96px;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.65;
  letter-spacing: -0.005em;
  -webkit-font-smoothing: antialiased;
  /* Every decorative layer is fixed and offset - without this a wide orb
     can extend the document sideways on narrow screens. */
  overflow-x: hidden;
}

img,
svg {
  max-width: 100%;
}

a {
  color: inherit;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 100;
  padding: 0.75rem 1.25rem;
  background: var(--indigo);
  color: #06070c;
  font-weight: 600;
  border-radius: 0 0 10px 0;
}

.skip-link:focus-visible {
  left: 0;
}

:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 4px;
}

.shell {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 clamp(1.25rem, 5vw, 2.5rem);
}

.shell--narrow {
  max-width: 760px;
}

/* ───────────────────────── scroll progress ───────────────────────── */

.progress {
  position: fixed;
  inset: 0 0 auto 0;
  height: 2px;
  z-index: 60;
  background: transparent;
  pointer-events: none;
}

.progress span {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--indigo), var(--cyan));
  box-shadow: 0 0 12px rgb(34 211 238 / 0.5);
}

/* ─────────────────────── parallax backdrop ───────────────────────── */

.backdrop {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}

/* A perspective-tilted grid that drifts as you scroll - the base "floor"
   of the whole page. */
.grid-plane {
  position: absolute;
  left: -25%;
  right: -25%;
  top: -10%;
  height: 150%;
  background-image:
    linear-gradient(to right, rgb(123 134 255 / 0.07) 1px, transparent 1px),
    linear-gradient(to bottom, rgb(123 134 255 / 0.07) 1px, transparent 1px);
  background-size: 68px 68px;
  transform: perspective(680px) rotateX(58deg) scale(1.9);
  transform-origin: 50% 0%;
  mask-image: radial-gradient(ellipse 80% 55% at 50% 30%, #000 20%, transparent 78%);
  -webkit-mask-image: radial-gradient(ellipse 80% 55% at 50% 30%, #000 20%, transparent 78%);
  will-change: transform;
}

.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.42;
  will-change: transform;
}

.orb--indigo {
  width: 46vw;
  height: 46vw;
  min-width: 340px;
  min-height: 340px;
  top: -8vh;
  left: -6vw;
  background: radial-gradient(circle at 35% 35%, #4d5bff, transparent 68%);
}

.orb--cyan {
  width: 38vw;
  height: 38vw;
  min-width: 280px;
  min-height: 280px;
  top: 22vh;
  right: -8vw;
  background: radial-gradient(circle at 60% 40%, #0fb9d6, transparent 68%);
  opacity: 0.34;
}

.orb--violet {
  width: 42vw;
  height: 42vw;
  min-width: 300px;
  min-height: 300px;
  top: 62vh;
  left: 18vw;
  background: radial-gradient(circle at 50% 50%, #8b3ff5, transparent 70%);
  opacity: 0.26;
}

.vignette {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 120% 80% at 50% 0%, transparent 30%, rgb(7 8 13 / 0.75) 78%),
    linear-gradient(180deg, transparent 55%, var(--bg) 96%);
}

/* Fine grain over the gradients - stops the large soft blurs from banding
   on 8-bit displays. Inline SVG so there is no image request. */
.noise {
  position: absolute;
  inset: -50%;
  opacity: 0.035;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ───────────────────────────── topbar ────────────────────────────── */

.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding: 0.9rem clamp(1.25rem, 5vw, 2.5rem);
  /* Deliberately transparent and un-blurred at rest. A blurred bar over
     the hero's gradient orbs draws a hard horizontal seam across the top
     of the page where the filter region ends - very visible against a
     soft gradient. Both only switch on once the bar is actually stuck,
     where the border-bottom makes that edge read as intentional. */
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background 0.3s ease, border-color 0.3s ease;
}

.topbar.is-stuck {
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  background: rgb(7 8 13 / 0.82);
  border-bottom-color: var(--edge-soft);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  font-weight: 700;
  letter-spacing: -0.03em;
  font-size: 1.15rem;
  margin-right: auto;
}

.brand__mark {
  width: 26px;
  height: 26px;
  flex: none;
}

.topnav {
  display: flex;
  gap: 1.75rem;
  font-size: 0.94rem;
  color: var(--ink-soft);
}

.topnav a {
  text-decoration: none;
  position: relative;
  padding-bottom: 2px;
  transition: color 0.2s ease;
}

.topnav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  height: 1px;
  width: 0;
  background: linear-gradient(90deg, var(--indigo), var(--cyan));
  transition: width 0.25s ease;
}

.topnav a:hover {
  color: var(--ink);
}

.topnav a:hover::after {
  width: 100%;
}

.topbar__actions {
  display: flex;
  gap: 0.6rem;
}

/* ───────────────────────────── buttons ───────────────────────────── */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.6rem 1.05rem;
  border-radius: 10px;
  font-size: 0.92rem;
  font-weight: 600;
  text-decoration: none;
  white-space: nowrap;
  border: 1px solid transparent;
  transition: transform 0.18s ease, background 0.22s ease, border-color 0.22s ease, box-shadow 0.22s ease;
}

.btn--lg {
  padding: 0.85rem 1.5rem;
  font-size: 1rem;
  border-radius: 12px;
}

.btn--solid {
  background: linear-gradient(135deg, #5f6bff, #4c5cf5 55%, #2f9fd6);
  color: #fff;
  box-shadow: 0 6px 24px rgb(76 92 245 / 0.32);
}

.btn--solid:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 34px rgb(76 92 245 / 0.45);
}

.btn--ghost {
  border-color: var(--edge);
  color: var(--ink-soft);
  background: rgb(255 255 255 / 0.02);
}

.btn--ghost:hover {
  border-color: #39405c;
  color: var(--ink);
  background: rgb(255 255 255 / 0.05);
  transform: translateY(-2px);
}

.btn__arrow {
  width: 17px;
  height: 17px;
  flex: none;
  transition: transform 0.2s ease;
}

.btn:hover .btn__arrow {
  transform: translateX(3px);
}

/* ────────────────────────────── hero ─────────────────────────────── */

main {
  position: relative;
  z-index: 1;
}

.hero {
  position: relative;
  min-height: calc(100svh - 62px);
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: clamp(4rem, 12vh, 9rem) 0 clamp(5rem, 14vh, 10rem);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  margin: 0 0 1.75rem;
  padding: 0.4rem 0.9rem 0.4rem 0.7rem;
  border: 1px solid var(--edge);
  border-radius: 999px;
  background: rgb(255 255 255 / 0.025);
  font-size: 0.82rem;
  color: var(--ink-soft);
  letter-spacing: 0.01em;
}

.dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--emerald);
  box-shadow: 0 0 0 0 rgb(52 211 153 / 0.6);
  animation: pulse 2.4s ease-out infinite;
}

@keyframes pulse {
  0% {
    box-shadow: 0 0 0 0 rgb(52 211 153 / 0.55);
  }
  70% {
    box-shadow: 0 0 0 9px rgb(52 211 153 / 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgb(52 211 153 / 0);
  }
}

.hero__title {
  margin: 0 0 1.6rem;
  /* The 2.2rem floor is measured, not guessed. The title's line breaks are
     hard <br>s, so its longest line ("AI agents can be") cannot reflow -
     at a 320px viewport that line renders 293px wide at a 2.6rem floor,
     against the 280px the shell's padding leaves. 2.2rem brings it to
     ~248px, with headroom for font fallback. Above ~360px the 7.2vw term
     takes over and this floor stops applying at all. */
  font-size: clamp(2.2rem, 7.2vw, 5.1rem);
  line-height: 1.03;
  letter-spacing: -0.045em;
  font-weight: 700;
  will-change: transform;
}

.grad {
  background: linear-gradient(100deg, #8b95ff 0%, #22d3ee 55%, #6ee7b7 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.grad-warn {
  background: linear-gradient(100deg, #fbbf24, #f97362);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.grad-good {
  background: linear-gradient(100deg, #34d399, #22d3ee);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero__lede {
  max-width: 58ch;
  margin: 0 0 2.4rem;
  font-size: clamp(1.05rem, 1.9vw, 1.28rem);
  color: var(--ink-soft);
}

.hero__lede em {
  font-style: normal;
  color: var(--ink);
  border-bottom: 1px solid rgb(123 134 255 / 0.45);
}

.hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  margin-bottom: 3rem;
}

.hero__honesty {
  max-width: 62ch;
  margin: 0;
  padding: 1rem 1.25rem;
  border-left: 2px solid rgb(251 191 36 / 0.55);
  border-radius: 0 10px 10px 0;
  background: rgb(251 191 36 / 0.05);
  font-size: 0.94rem;
  color: var(--ink-mute);
}

.hero__honesty strong {
  color: var(--amber);
}

.scroll-hint {
  position: absolute;
  left: 50%;
  bottom: 2.2rem;
  transform: translateX(-50%);
  width: 22px;
  height: 34px;
  border: 1px solid var(--edge);
  border-radius: 12px;
  display: flex;
  justify-content: center;
  padding-top: 6px;
}

.scroll-hint span {
  width: 3px;
  height: 7px;
  border-radius: 2px;
  background: var(--ink-faint);
  animation: drop 1.9s ease-in-out infinite;
}

@keyframes drop {
  0%,
  100% {
    transform: translateY(0);
    opacity: 0;
  }
  30% {
    opacity: 1;
  }
  70% {
    transform: translateY(11px);
    opacity: 0;
  }
}

/* ──────────────────────────── sections ───────────────────────────── */

.section {
  position: relative;
  padding: clamp(5rem, 13vh, 9rem) 0;
}

.section--tinted {
  background: linear-gradient(180deg, transparent, rgb(13 15 24 / 0.75) 12%, rgb(13 15 24 / 0.75) 88%, transparent);
  border-top: 1px solid var(--edge-soft);
  border-bottom: 1px solid var(--edge-soft);
}

.section__num {
  margin: 0 0 1.1rem;
  font-family: var(--mono);
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.section__title {
  margin: 0 0 1.4rem;
  max-width: 20ch;
  font-size: clamp(2rem, 4.6vw, 3.15rem);
  line-height: 1.1;
  letter-spacing: -0.035em;
  font-weight: 700;
}

.section__lede {
  max-width: 66ch;
  margin: 0 0 3.5rem;
  font-size: clamp(1rem, 1.6vw, 1.15rem);
  color: var(--ink-soft);
}

.section__lede em {
  font-style: normal;
  color: var(--ink);
}

/* ──────────────────────────── problem ────────────────────────────── */

.problems {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1.15rem;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.problem {
  position: relative;
  padding: 1.9rem 1.6rem 1.6rem;
  border: 1px solid var(--edge-soft);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgb(255 255 255 / 0.028), rgb(255 255 255 / 0.008));
  transition: border-color 0.3s ease, transform 0.3s ease;
}

.problem:hover {
  border-color: rgb(251 191 36 / 0.28);
  transform: translateY(-3px);
}

.problem__idx {
  display: inline-block;
  margin-bottom: 0.9rem;
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  color: var(--amber);
  opacity: 0.75;
}

.problem h3 {
  margin: 0 0 0.7rem;
  font-size: 1.13rem;
  letter-spacing: -0.02em;
  line-height: 1.3;
}

.problem p {
  margin: 0;
  font-size: 0.96rem;
  color: var(--ink-mute);
}

/* ──────────────────────────── diagram ────────────────────────────── */

.diagram {
  margin: 0 0 4rem;
  padding: 2rem 1.5rem 1.5rem;
  border: 1px solid var(--edge-soft);
  border-radius: var(--radius);
  background: rgb(7 8 13 / 0.5);
  position: relative;
  overflow-x: auto;
}

.flow {
  width: 100%;
  min-width: 620px;
  height: auto;
  display: block;
}

.flow .node rect {
  fill: rgb(18 21 34 / 0.95);
  stroke: #2a3049;
  stroke-width: 1.5;
}

.flow .node--verify rect {
  stroke: rgb(123 134 255 / 0.5);
}

.flow .node--settle rect {
  stroke: rgb(52 211 153 / 0.55);
}

.flow .node__title {
  fill: #eef1fa;
  font-family: var(--font);
  font-size: 15px;
  font-weight: 600;
  text-anchor: middle;
}

.flow .node__sub {
  fill: #7d859f;
  font-family: var(--mono);
  font-size: 11.5px;
  text-anchor: middle;
}

/* Dashes crawl along the wires, so the diagram reads as flow rather than
   as a static box-and-line drawing. */
.flow .wire {
  stroke-dasharray: 5 9;
  animation: crawl 1.6s linear infinite;
}

@keyframes crawl {
  to {
    stroke-dashoffset: -28;
  }
}

.diagram figcaption {
  margin-top: 1.4rem;
  font-size: 0.92rem;
  color: var(--ink-mute);
  max-width: 72ch;
}

.badge {
  display: inline-block;
  margin-bottom: 1.25rem;
  padding: 0.28rem 0.7rem;
  border-radius: 999px;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.badge--planned {
  color: var(--amber);
  background: rgb(251 191 36 / 0.1);
  border: 1px solid rgb(251 191 36 / 0.3);
}

.badge--live {
  color: var(--emerald);
  background: rgb(52 211 153 / 0.1);
  border: 1px solid rgb(52 211 153 / 0.3);
}

/* ──────────────────────────── pillars ────────────────────────────── */

/* Two columns, not auto-fit: there are four pillars, and at desktop widths
   auto-fit resolves to three, leaving the fourth alone on a row with two
   empty cells beside it. 2x2 is the only balanced arrangement for four. */
.pillars {
  display: grid;
  gap: 1.15rem;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 420px), 1fr));
}

.pillar {
  padding: 1.75rem 1.6rem;
  border: 1px solid var(--edge-soft);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgb(255 255 255 / 0.03), rgb(255 255 255 / 0.006));
  transition: border-color 0.3s ease, transform 0.3s ease;
}

.pillar:hover {
  border-color: rgb(123 134 255 / 0.3);
  transform: translateY(-3px);
}

.pillar h3 {
  margin: 0 0 0.75rem;
  font-size: 1.18rem;
  letter-spacing: -0.02em;
  line-height: 1.3;
}

.pillar p {
  margin: 0 0 0.85rem;
  font-size: 0.96rem;
  color: var(--ink-mute);
}

.pillar p:last-child {
  margin-bottom: 0;
}

.pillar em {
  font-style: normal;
  color: var(--ink-soft);
}

.pillar__detail {
  padding-top: 0.85rem;
  border-top: 1px solid var(--edge-soft);
  font-size: 0.9rem !important;
  color: var(--ink-faint) !important;
}

/* ───────────────────────────── cards ─────────────────────────────── */

.stack {
  display: grid;
  gap: 1.15rem;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.card {
  display: block;
  padding: 1.7rem 1.55rem;
  border: 1px solid var(--edge-soft);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgb(255 255 255 / 0.03), rgb(255 255 255 / 0.006));
  text-decoration: none;
  transition: border-color 0.3s ease, transform 0.3s ease, box-shadow 0.3s ease;
}

.card h3 {
  margin: 0 0 0.65rem;
  font-size: 1.1rem;
  letter-spacing: -0.02em;
  display: flex;
  align-items: baseline;
  gap: 0.45rem;
}

.card p {
  margin: 0 0 1.1rem;
  font-size: 0.94rem;
  color: var(--ink-mute);
}

.card code {
  font-family: var(--mono);
  font-size: 0.86em;
  padding: 0.1em 0.35em;
  border-radius: 5px;
  background: rgb(123 134 255 / 0.12);
  color: #b9c0ff;
}

.card__meta {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--ink-faint);
  letter-spacing: 0.01em;
}

.card__go {
  color: var(--cyan);
  font-size: 0.9rem;
  transition: transform 0.2s ease;
  display: inline-block;
}

.card--link:hover {
  border-color: rgb(34 211 238 / 0.38);
  transform: translateY(-3px);
  box-shadow: 0 14px 40px rgb(0 0 0 / 0.35);
}

.card--link:hover .card__go {
  transform: translate(3px, -3px);
}

.card--muted {
  opacity: 0.62;
}

/* ──────────────────────────── codeblock ──────────────────────────── */

.codeblock {
  margin: 0 0 2.5rem;
  border: 1px solid var(--edge);
  border-radius: var(--radius);
  overflow: hidden;
  background: #06070c;
  box-shadow: 0 24px 70px rgb(0 0 0 / 0.5);
  will-change: transform;
}

.codeblock__bar {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding: 0.7rem 1rem;
  border-bottom: 1px solid var(--edge-soft);
  background: rgb(255 255 255 / 0.02);
}

.codeblock__dots {
  display: inline-flex;
  gap: 0.4rem;
}

.codeblock__dots i {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #262b3d;
}

.codeblock__name {
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--ink-faint);
}

.codeblock pre {
  margin: 0;
  padding: 1.5rem 1.4rem;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 0.85rem;
  line-height: 1.75;
  color: #d3d9ee;
  tab-size: 2;
}

.codeblock .c {
  color: #5d6480;
  font-style: italic;
}

.codeblock .k {
  color: #a78bfa;
}

.codeblock .f {
  color: #67e8f9;
}

.codeblock .s {
  color: #6ee7b7;
}

.build__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
}

/* ───────────────────────────── close ─────────────────────────────── */

.close {
  text-align: center;
  padding-bottom: clamp(6rem, 16vh, 11rem);
}

.close__title {
  margin: 0 0 1.5rem;
  font-size: clamp(2rem, 4.6vw, 3.15rem);
  line-height: 1.12;
  letter-spacing: -0.035em;
  font-weight: 700;
}

.close__body {
  margin: 0 auto 2.5rem;
  max-width: 60ch;
  font-size: clamp(1rem, 1.6vw, 1.15rem);
  color: var(--ink-soft);
}

.close__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  justify-content: center;
}

/* ───────────────────────────── footer ────────────────────────────── */

.footer {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--edge-soft);
  background: rgb(5 6 10 / 0.85);
  padding: 2.75rem 0;
}

.footer__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1.25rem 2rem;
}

.footer__brand {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--ink-soft);
}

.footer__links {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  margin-left: auto;
  font-size: 0.92rem;
  color: var(--ink-mute);
}

.footer__links a {
  text-decoration: none;
  transition: color 0.2s ease;
}

.footer__links a:hover {
  color: var(--ink);
}

.footer__note {
  flex-basis: 100%;
  margin: 0;
  padding-top: 1.25rem;
  border-top: 1px solid var(--edge-soft);
  font-size: 0.85rem;
  color: var(--ink-faint);
}

/* ────────────────────────── reveal on scroll ─────────────────────── */

/* Only applied once main.js confirms IntersectionObserver support and
   tags <html> - without JS, nothing is ever hidden.
 *
 * Kept deliberately short. A longer, more luxurious transition looked
 * better when stepping through the page slowly and much worse in the case
 * that actually matters - a fast scroll, where a section still fading in
 * a second after it entered the viewport reads as content failing to
 * load rather than as an effect. */
.js .reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.42s cubic-bezier(0.16, 1, 0.3, 1), transform 0.42s cubic-bezier(0.16, 1, 0.3, 1);
}

.js .reveal.is-in {
  opacity: 1;
  transform: none;
}

/* ───────────────────────────── responsive ────────────────────────── */

@media (max-width: 860px) {
  .topnav {
    display: none;
  }
}

@media (max-width: 560px) {
  body {
    font-size: 16px;
  }

  .topbar__actions .btn--ghost {
    display: none;
  }

  .hero {
    min-height: auto;
    padding-top: 3.5rem;
  }

  .scroll-hint {
    display: none;
  }

  .diagram {
    padding: 1.5rem 1rem 1.25rem;
  }

  .footer__links {
    margin-left: 0;
    gap: 1rem;
  }
}

/* ───────────────────── reduced motion / print ────────────────────── */

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

  /* Reveals must not stay invisible when their transition is neutered -
     main.js also skips the observer entirely in this mode, this is the
     belt-and-braces half. */
  .js .reveal {
    opacity: 1;
    transform: none;
  }
}