/* ==========================================================================
   term_6 landing — "Signal" design system
   Dark technical-console aesthetic: near-black canvas, thin cyan grid lines,
   monospace micro-labels, electric cyan/blue accents.
   Single source of truth for colour, spacing, type and components.
   ========================================================================== */

/* ---------------------------------------------------------------- tokens */
:root {
  /* colour */
  --bg: #05070d;
  --bg-1: #080c16;
  --surface: rgba(255, 255, 255, .025);
  --line: rgba(148, 178, 255, .14);
  --line-strong: rgba(148, 178, 255, .26);
  --grid-line: rgba(18, 230, 200, .055);
  --ink: #e8eef9;
  --ink-2: #aab8d4;
  --ink-3: #8695b6;
  --cyan: #12e6c8;
  --blue: #3b82f6;
  --cyan-a12: rgba(18, 230, 200, .12);
  --cyan-a24: rgba(18, 230, 200, .24);
  --ok: #34d399;
  --err: #fca5a5;
  --err-line: rgba(248, 113, 113, .5);

  /* type */
  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --fs-xs: .72rem;
  --fs-sm: .85rem;
  --fs-base: .95rem;
  --fs-md: 1.05rem;
  --fs-lg: 1.25rem;
  --fs-2xl: clamp(1.7rem, 3.2vw, 2.15rem);
  --fs-3xl: clamp(2.1rem, 5.6vw, 3.5rem);
  --lh-tight: 1.14;
  --lh-body: 1.65;

  /* spacing scale */
  --sp-1: .25rem;
  --sp-2: .5rem;
  --sp-3: .75rem;
  --sp-4: 1rem;
  --sp-5: 1.5rem;
  --sp-6: 2rem;
  --sp-7: 3rem;
  --sp-8: 4.5rem;
  --sp-9: 6.5rem;
  --gutter: clamp(1.1rem, 4vw, 2rem);

  /* shape + depth */
  --radius-sm: .5rem;
  --radius: .9rem;
  --radius-lg: 1.25rem;
  --container: 1120px;
  --header-h: 4rem;
  --shadow: 0 22px 60px rgba(3, 8, 20, .55);
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--fs-md);
  line-height: var(--lh-body);
  color: var(--ink);
  overflow-wrap: break-word;
  background-color: var(--bg);
  background-image:
    linear-gradient(to right, var(--grid-line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid-line) 1px, transparent 1px),
    radial-gradient(1100px 520px at 50% -160px, rgba(59, 130, 246, .16), transparent 62%);
  background-size: 64px 64px, 64px 64px, 100% 100%;
  background-repeat: repeat, repeat, no-repeat;
}

h1, h2, h3 {
  margin: 0 0 var(--sp-3);
  line-height: var(--lh-tight);
  font-weight: 650;
  letter-spacing: -.015em;
  text-wrap: balance;
}

h1 { font-size: var(--fs-3xl); }
h2 { font-size: var(--fs-2xl); }
h3 { font-size: var(--fs-lg); }

p { margin: 0 0 var(--sp-4); }

strong { color: #fff; font-weight: 600; }

code {
  font-family: var(--font-mono);
  font-size: .85em;
  color: var(--cyan);
  background: var(--cyan-a12);
  padding: .12em .38em;
  border-radius: 5px;
  overflow-wrap: anywhere;
}

a { color: var(--cyan); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }

::selection { background: rgba(18, 230, 200, .28); color: #fff; }

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

[id] { scroll-margin-top: calc(var(--header-h) + 1rem); }

/* ------------------------------------------------------------- utilities */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.container--narrow { max-width: 780px; }

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  margin: -1px; padding: 0;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  left: var(--gutter);
  top: -4rem;
  z-index: 100;
  padding: .6rem 1rem;
  background: var(--cyan);
  color: #04121a;
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: top .15s ease;
}
.skip-link:focus { top: .8rem; text-decoration: none; }

.kicker {
  margin: 0 0 var(--sp-4);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--cyan);
}

.lede { color: var(--ink-2); max-width: 60ch; }

/* Layout safety: grid/flex children must be allowed to shrink, otherwise a long
   unbreakable string can force horizontal overflow on a 390px viewport. */
.grid > *,
.steps > *,
.arch-flow > *,
.hero__inner > *,
.access > *,
.footer__inner > *,
.header__inner > * { min-width: 0; }

.grad {
  background: linear-gradient(100deg, var(--cyan), #63d7ff 48%, var(--blue));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.dot {
  display: inline-block;
  width: .5rem; height: .5rem;
  border-radius: 50%;
  background: var(--line-strong);
  flex: 0 0 auto;
}
.dot--cyan { background: var(--cyan); box-shadow: 0 0 10px var(--cyan-a24); }
.dot--ok { background: var(--ok); }
.dot--bad { background: var(--err); }

/* ---------------------------------------------------------------- buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  min-height: 46px;
  padding: .72rem 1.2rem;
  border: 1px solid transparent;
  border-radius: 10px;
  font: inherit;
  font-size: var(--fs-base);
  font-weight: 600;
  cursor: pointer;
  transition: transform .16s ease, box-shadow .2s ease, border-color .2s ease, background-color .2s ease, color .2s ease;
}
.btn:hover { transform: translateY(-1px); text-decoration: none; }
.btn--primary {
  background: linear-gradient(135deg, var(--cyan), #3ecbfa 55%, var(--blue));
  color: #03121a;
  box-shadow: 0 10px 30px rgba(18, 230, 200, .18);
}
.btn--primary:hover { box-shadow: 0 14px 38px rgba(18, 230, 200, .28); }
.btn--ghost {
  background: rgba(255, 255, 255, .02);
  border-color: var(--line-strong);
  color: var(--ink);
}
.btn--ghost:hover { border-color: var(--cyan); color: #fff; }
.btn--sm { min-height: 40px; padding: .45rem .9rem; font-size: .8rem; }
.btn--block { width: 100%; }

/* ----------------------------------------------------------------- header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(5, 7, 13, .88);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}

.header__inner {
  display: flex;
  align-items: center;
  gap: var(--sp-3) var(--sp-4);
  min-height: var(--header-h);
  flex-wrap: wrap;
}

.wordmark {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: .02em;
}
.wordmark:hover { color: #fff; text-decoration: none; }
.wordmark__tick {
  display: inline-block;
  width: .5ch;
  height: 1.05em;
  margin-left: .18rem;
  background: var(--cyan);
  box-shadow: 0 0 12px var(--cyan-a24);
  animation: blink 1.6s steps(2, end) infinite;
}
@keyframes blink { 50% { opacity: .15; } }

.primary-nav { margin-left: auto; }
.primary-nav__list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-3) var(--sp-5);
  margin: 0;
  padding: 0;
  list-style: none;
}
.primary-nav__link {
  position: relative;
  display: inline-block;
  padding: .35rem 0;
  font-size: var(--fs-sm);
  color: var(--ink-2);
}
.primary-nav__link:hover { color: #fff; text-decoration: none; }
.primary-nav__link::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 1px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .2s ease;
}
.primary-nav__link:hover::after { transform: scaleX(1); }

.header__actions { display: flex; align-items: center; gap: var(--sp-2); }

.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 42px; height: 42px;
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  background: rgba(255, 255, 255, .02);
  color: var(--ink);
  cursor: pointer;
}
.nav-toggle:hover { border-color: var(--cyan); }
.nav-toggle__icon { display: inline-flex; flex-direction: column; gap: 4px; width: 18px; }
.nav-toggle__icon span { display: block; height: 2px; border-radius: 2px; background: currentColor; }

/* ------------------------------------------------------------------- hero */
.hero { padding: clamp(2.5rem, 6vw, 5.5rem) 0 clamp(3rem, 7vw, 6rem); }
.hero__inner { display: grid; gap: clamp(2rem, 5vw, 3.5rem); }
.hero h1 { margin-bottom: var(--sp-4); }
.hero .lede { margin-bottom: 0; }

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-3);
  margin: var(--sp-5) 0;
}

.hero__chips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-3) var(--sp-5);
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.hero__chips li { display: inline-flex; align-items: center; gap: var(--sp-2); }

.hero__visual { position: relative; max-width: 620px; }
.signal { display: block; width: 100%; height: auto; }

/* product visual (inline SVG) */
.signal .panel { fill: rgba(7, 11, 20, .88); stroke: rgba(18, 230, 200, .22); }
.signal .panel__grid { opacity: .75; }
.signal .panel__rule { stroke: var(--line); }
.signal .panel__dot--r { fill: #ff5f57; opacity: .55; }
.signal .panel__dot--y { fill: #febc2e; opacity: .55; }
.signal .panel__dot--g { fill: #28c840; opacity: .55; }
.signal text.mono {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .04em;
  fill: var(--ink-2);
}
.signal .mono--dim { fill: var(--ink-3); font-size: 10px; }
.signal .mono--accent { fill: var(--cyan); }
.signal .mono--bright { fill: var(--ink); }
.signal .pill { fill: rgba(59, 130, 246, .12); stroke: rgba(59, 130, 246, .55); }
.signal .gates { fill: rgba(18, 230, 200, .05); stroke: rgba(18, 230, 200, .22); }
.signal .chip { fill: rgba(255, 255, 255, .03); stroke: var(--line-strong); }
.signal .chip--accent { fill: var(--cyan-a12); stroke: rgba(18, 230, 200, .5); }
.signal .chip__label { fill: var(--ink-2); font-size: 10px; }
.signal .chip__label--accent { fill: var(--cyan); }
.signal .node__core { fill: #0b1220; stroke: var(--cyan); stroke-width: 1.5; }
.signal .node__core--sm { stroke-width: 1.2; }
.signal .node__pip { fill: var(--cyan); }
.signal .node__pip--sm { fill: var(--blue); }
.signal .node__halo {
  fill: url(#halo);
  transform-box: fill-box;
  transform-origin: center;
  animation: halo 4s ease-in-out infinite;
}
.signal .live-dot { fill: var(--cyan); animation: live 2.4s ease-in-out infinite; }
.signal .queue { fill: rgba(148, 178, 255, .16); }
.signal .queue__fill {
  fill: url(#beam);
  transform-box: fill-box;
  transform-origin: left center;
  animation: queue 5s ease-in-out infinite alternate;
}
.signal .queue__fill.q2 { animation-delay: .8s; }
.signal .queue__fill.q3 { animation-delay: 1.6s; }
.signal .flow {
  fill: none;
  stroke: rgba(18, 230, 200, .5);
  stroke-width: 1.4;
  stroke-dasharray: 5 7;
  animation: dash 2.6s linear infinite;
}
.signal .flow--alt { stroke: rgba(59, 130, 246, .55); }

@keyframes dash { to { stroke-dashoffset: -48; } }
@keyframes halo { 0%, 100% { opacity: .55; transform: scale(.92); } 50% { opacity: 1; transform: scale(1.06); } }
@keyframes queue { from { transform: scaleX(.35); } to { transform: scaleX(.94); } }
@keyframes live { 0%, 100% { opacity: 1; } 50% { opacity: .25; } }

/* --------------------------------------------------------------- sections */
.section {
  padding: clamp(3.25rem, 7vw, 6rem) 0;
  border-top: 1px solid var(--line);
}
.section--alt { background: linear-gradient(180deg, rgba(59, 130, 246, .06), transparent 60%); }
.section--flush { padding-top: clamp(2.5rem, 5vw, 4rem); border-top: 0; }

.section-head { max-width: 720px; margin-bottom: clamp(2rem, 4vw, 3rem); }
.section-head h2 { margin-bottom: var(--sp-3); }
.section-sub { margin: 0; color: var(--ink-2); font-size: var(--fs-md); }

.grid { display: grid; gap: var(--sp-4); margin: 0; padding: 0; list-style: none; }

/* ------------------------------------------------------------------ cards */
.card {
  position: relative;
  padding: var(--sp-5);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, var(--surface), rgba(255, 255, 255, 0) 55%), var(--bg-1);
  transition: border-color .2s ease, transform .2s ease, box-shadow .2s ease;
}
.card::before {
  content: "";
  position: absolute;
  top: -1px; left: 1.25rem; right: 1.25rem;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--cyan-a24), transparent);
}
.card:hover {
  border-color: rgba(18, 230, 200, .4);
  transform: translateY(-3px);
  box-shadow: 0 18px 40px rgba(2, 8, 20, .5);
}
.card__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--sp-4);
}
.card__index {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: .16em;
  color: var(--cyan);
}
.card h3 { margin-bottom: var(--sp-3); font-size: 1.06rem; }
.card p { margin: 0; color: var(--ink-2); font-size: var(--fs-sm); }

.icon {
  width: 26px; height: 26px;
  fill: none;
  stroke: var(--cyan);
  stroke-width: 1.6;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* ------------------------------------------------------------------ steps */
.steps { display: grid; gap: var(--sp-4); margin: 0; padding: 0; list-style: none; }
.step {
  position: relative;
  padding: var(--sp-5);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg-1);
}
.step__num {
  display: inline-block;
  margin-bottom: var(--sp-4);
  padding: .22rem .55rem;
  border: 1px solid var(--cyan-a24);
  border-radius: 999px;
  background: var(--cyan-a12);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: .18em;
  color: var(--cyan);
}
.step h3 { margin-bottom: var(--sp-2); font-size: 1.02rem; }
.step p { margin: 0; color: var(--ink-2); font-size: var(--fs-sm); }

/* ------------------------------------------------------------ architecture */
.arch-flow {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--sp-2);
  margin: 0 0 var(--sp-6);
  padding: 0;
  list-style: none;
}
.arch-flow li {
  position: relative;
  padding: .45rem .8rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, .02);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--ink-2);
}

.proof {
  padding: var(--sp-5);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg-1);
}
.proof h3 { margin-bottom: var(--sp-2); font-size: 1.02rem; }
.proof p { margin: 0; color: var(--ink-2); font-size: var(--fs-sm); }

.stack-strip {
  margin-top: var(--sp-6);
  padding: var(--sp-5);
  border: 1px dashed var(--line-strong);
  border-radius: var(--radius);
  background: rgba(18, 230, 200, .03);
}
.stack-strip__list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-2) var(--sp-3);
  margin: 0 0 var(--sp-3);
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--ink-2);
}
.stack-strip__list li {
  padding: .35rem .6rem;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: rgba(255, 255, 255, .02);
}
.stack-strip__note { margin: 0; font-size: var(--fs-sm); color: var(--ink-3); }

/* ------------------------------------------------------------ access/form */
.access { display: grid; gap: clamp(2rem, 4vw, 3.5rem); }
.access__points {
  display: grid;
  gap: var(--sp-3);
  margin: var(--sp-5) 0 0;
  padding: 0;
  list-style: none;
  color: var(--ink-2);
  font-size: var(--fs-sm);
}
.access__points li { display: flex; gap: var(--sp-3); }
.access__points li::before {
  content: "\2713";
  font-family: var(--font-mono);
  color: var(--cyan);
  flex: 0 0 auto;
}

.access__form {
  padding: clamp(1.25rem, 3vw, 2rem);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: linear-gradient(180deg, var(--surface), rgba(255, 255, 255, 0) 50%), var(--bg-1);
  box-shadow: var(--shadow);
}

.form { display: grid; gap: var(--sp-4); }
.field label { display: block; margin-bottom: var(--sp-2); font-size: var(--fs-sm); font-weight: 600; }
.field__hint { color: var(--ink-3); font-weight: 400; }
.req { color: var(--cyan); }

.field input,
.field textarea {
  width: 100%;
  padding: .7rem .85rem;
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  background: rgba(4, 8, 16, .75);
  color: var(--ink);
  font: inherit;
  font-size: var(--fs-base);
}
.field textarea { resize: vertical; min-height: 6.5rem; }
.field input:hover, .field textarea:hover { border-color: rgba(18, 230, 200, .4); }
.field input:focus, .field textarea:focus {
  outline: none;
  border-color: var(--cyan);
  box-shadow: 0 0 0 3px rgba(18, 230, 200, .18);
}
.field input[aria-invalid="true"],
.field textarea[aria-invalid="true"] { border-color: var(--err-line); }
.field__error {
  margin: .4rem 0 0;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--err);
}
.field__error[hidden] { display: none; }
.form__note { margin: 0; text-align: center; font-size: var(--fs-xs); color: var(--ink-3); }

.hp-field { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.form-status:empty { display: none; }

.alert {
  margin: 0 0 var(--sp-4);
  padding: .85rem 1rem;
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  font-size: var(--fs-sm);
}
.alert p { margin: 0; }
.alert--ok { border-color: rgba(52, 211, 153, .45); background: rgba(52, 211, 153, .08); color: #d9f7ea; }
.alert--error { border-color: var(--err-line); background: rgba(248, 113, 113, .08); color: #ffe4e4; }
.alert__reset {
  margin: var(--sp-3) 0 0;
  padding: 0;
  border: 0;
  background: none;
  color: var(--cyan);
  font: inherit;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  text-decoration: underline;
  cursor: pointer;
}

/* ----------------------------------------------------------------- footer */
.site-footer {
  padding: clamp(2.5rem, 5vw, 4rem) 0 var(--sp-5);
  border-top: 1px solid var(--line);
  background: rgba(4, 6, 12, .6);
}
.footer__inner { display: grid; gap: var(--sp-6); }
.wordmark--footer { margin: 0 0 var(--sp-2); font-size: 1.2rem; }
.footer__tagline { margin: 0; max-width: 38ch; color: var(--ink-3); font-size: var(--fs-sm); }
.footer__nav { display: grid; gap: var(--sp-5); }
.footer__h {
  margin: 0 0 var(--sp-3);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  font-weight: 500;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.footer__col ul { display: grid; gap: var(--sp-2); margin: 0; padding: 0; list-style: none; }
.footer__col a { color: var(--ink-2); font-size: var(--fs-sm); }
.footer__col a:hover { color: var(--cyan); }
.footer__bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--sp-2) var(--sp-5);
  margin-top: var(--sp-6);
  padding-top: var(--sp-4);
  border-top: 1px solid var(--line);
  font-size: var(--fs-xs);
  color: var(--ink-3);
}
.footer__bottom p { margin: 0; }
.footer__meta { font-family: var(--font-mono); }

/* --------------------------------------------------------- status / error */
.status-list {
  margin: var(--sp-5) 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg-1);
  overflow: hidden;
}
.status-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--sp-2) var(--sp-4);
  padding: .85rem 1.1rem;
  border-bottom: 1px solid var(--line);
  font-size: var(--fs-sm);
}
.status-row:last-child { border-bottom: 0; }
.status-row dt { color: var(--ink-3); }
.status-row dd {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--ink);
}
.status-actions { display: flex; flex-wrap: wrap; gap: var(--sp-3); margin: 0; }
.error-page h1 { margin-bottom: var(--sp-3); }

/* -------------------------------------------------------------- responsive */
@media (min-width: 640px) {
  .footer__nav { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (min-width: 720px) {
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .steps { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .arch-flow { gap: var(--sp-4); }
  .arch-flow li:not(:last-child)::after {
    content: "\2192";
    position: absolute;
    left: 100%;
    top: 50%;
    transform: translateY(-50%);
    margin-left: .35rem;
    color: var(--cyan);
    font-family: var(--font-mono);
  }
}

@media (min-width: 860px) {
  .footer__inner { grid-template-columns: 1.1fr 2fr; align-items: start; }
}

@media (min-width: 960px) {
  .hero__inner { grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr); align-items: center; }
  .hero__visual { max-width: none; }
  .access { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); align-items: start; }
}

@media (min-width: 1000px) {
  .grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .steps { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .step:not(:last-child)::after {
    content: "\2192";
    position: absolute;
    right: -1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--cyan);
    opacity: .75;
    font-family: var(--font-mono);
  }
}

@media (max-width: 859px) {
  .nav-toggle { display: inline-flex; }
  html.js .primary-nav { display: none; }
  html.js .primary-nav.is-open {
    display: flex;
    position: absolute;
    left: 0; right: 0; top: 100%;
    max-height: calc(100vh - var(--header-h));
    overflow-y: auto;
    padding: var(--sp-4) var(--gutter) var(--sp-5);
    background: rgba(6, 9, 17, .98);
    border-bottom: 1px solid var(--line-strong);
    box-shadow: var(--shadow);
  }
  html.js .primary-nav.is-open .primary-nav__list { flex-direction: column; gap: var(--sp-1); }
  html.js .primary-nav.is-open .primary-nav__link { display: block; padding: .6rem 0; font-size: var(--fs-md); }
}

/* ---------------------------------------------------------- accessibility */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
}