:root {
  --canvas: #e7edf6;
  --ink: #141a2e;
  --muted: #46506a;
  --line: #c9d3e4;
  --panel: #f8fafd;
  --cobalt: #1e3a9a;
  --cobalt-deep: #152a72;
  --lime: #dff25a;
  --lime-ink: #1a2208;
  --rail: #141a2e;
  --header: 4.5rem;
  --max: 76rem;
  --sans: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  --mono: "Cascadia Mono", "Segoe UI Mono", Consolas, monospace;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header) + 0.75rem);
}

body {
  margin: 0;
  overflow-wrap: anywhere;
  color: var(--ink);
  background:
    linear-gradient(90deg, rgba(20, 26, 46, 0.04) 1px, transparent 1px) 0 0 / 28px 28px,
    var(--canvas);
  font-family: var(--sans);
  font-size: 1.0625rem;
  line-height: 1.7;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--cobalt);
}

a:hover {
  color: var(--cobalt-deep);
}

.skip {
  position: absolute;
  left: 0.75rem;
  top: -4rem;
  z-index: 20;
  background: var(--lime);
  color: var(--lime-ink);
  padding: 0.5rem 0.8rem;
  text-decoration: none;
}

.skip:focus {
  top: 0.75rem;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  height: var(--header);
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto auto;
  align-items: center;
  gap: 0.6rem;
  padding: 0 1rem;
  background: rgba(248, 250, 253, 0.96);
  border-bottom: 3px solid var(--cobalt);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  color: var(--ink);
  text-decoration: none;
  min-width: 0;
  flex: 1;
}

.brand img {
  width: 36px;
  height: 36px;
  flex: 0 0 auto;
}

.brand-name {
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  font-weight: 700;
}

.brand-sub {
  display: block;
  color: var(--muted);
  font-size: 0.75rem;
}

.nav-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
  min-height: 2.75rem;
  min-width: 2.75rem;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--ink);
  font: inherit;
  font-size: 0.85rem;
}

.nav-panel {
  display: none;
}

.nav-panel.is-open {
  display: block;
  position: absolute;
  left: 0;
  right: 0;
  top: var(--header);
  padding: 0.75rem 1.25rem 1rem;
  background: var(--panel);
  border-bottom: 1px solid var(--line);
}

.nav-panel ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-panel a {
  display: flex;
  align-items: center;
  min-height: 2.75rem;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
}

.nav-cta,
.action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
  min-height: 2.75rem;
  padding: 0.55rem 1rem;
  background: var(--cobalt);
  color: #fff;
  text-decoration: none;
  font-weight: 600;
  letter-spacing: 0.01em;
}

.nav-cta:hover,
.action:hover {
  background: var(--cobalt-deep);
  color: #fff;
}

.action-lime {
  background: var(--lime);
  color: var(--lime-ink);
}

.action-lime:hover {
  background: #d0e34a;
  color: var(--lime-ink);
}

.wrap {
  width: min(var(--max), calc(100% - 2rem));
  margin: 0 auto;
}

.hero {
  padding: 1.5rem 0 2.5rem;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.5rem;
}

.hero-grid > *,
.board,
.spec {
  min-width: 0;
  max-width: 100%;
}

.kicker {
  margin: 0 0 0.8rem;
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cobalt);
}

h1,
h2,
h3 {
  line-height: 1.2;
  font-weight: 700;
}

h1 {
  margin: 0 0 1rem;
  font-size: clamp(1.85rem, 4vw, 3.1rem);
  letter-spacing: -0.03em;
  max-width: 16ch;
}

.lede,
.block p {
  margin: 0 0 0.9rem;
  max-width: 62ch;
}

.snap {
  margin: 0 0 0.9rem;
  font-weight: 700;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
  min-height: 3rem;
  margin: 1.2rem 0 0.4rem;
}

.quiet {
  color: var(--muted);
  font-size: 0.92rem;
  text-decoration: none;
  min-height: 2.75rem;
  display: inline-flex;
  align-items: center;
}

.board {
  background: var(--rail);
  color: #e7edf6;
  padding: 0.85rem;
}

.board img {
  width: 100%;
  height: auto;
  aspect-ratio: 640 / 400;
  background: #1c243d;
}

.board figcaption {
  margin-top: 0.7rem;
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: #c9d3e4;
}

.band {
  padding: 2.4rem 0;
  border-top: 1px solid var(--line);
}

.band-head {
  display: grid;
  gap: 0.4rem;
  margin-bottom: 1.2rem;
}

.index {
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  color: var(--cobalt);
}

h2 {
  margin: 0;
  font-size: clamp(1.45rem, 2.4vw, 2rem);
  letter-spacing: -0.02em;
}

h3 {
  margin: 0 0 0.45rem;
  font-size: 1.15rem;
}

.steps {
  list-style: none;
  margin: 1.2rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.75rem;
}

.steps li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.9rem;
  padding: 0.95rem 1rem;
  background: var(--panel);
  border-left: 4px solid var(--cobalt);
}

.num {
  font-family: var(--mono);
  color: var(--cobalt);
  font-weight: 700;
}

.devices {
  display: grid;
  gap: 1rem;
}

.device {
  padding: 1rem 1rem 0.3rem;
  background: var(--panel);
  border-top: 4px solid var(--ink);
}

.spec {
  width: 100%;
  table-layout: fixed;
  border-collapse: collapse;
  background: var(--panel);
}

.spec th,
.spec td {
  text-align: left;
  padding: 0.85rem 0.9rem;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

.spec th {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  font-weight: 600;
  width: 34%;
  color: var(--cobalt-deep);
}

.notice {
  background: var(--rail);
  color: #e7edf6;
}

.notice h2,
.notice a {
  color: var(--lime);
}

.notice p {
  max-width: 68ch;
}

.legal {
  background: #f4f7fb;
}

.foot {
  background: var(--rail);
  color: #d5deee;
  padding: 2rem 0 2.4rem;
}

.foot a {
  color: var(--lime);
}

.foot-grid {
  display: grid;
  gap: 1.25rem;
}

.foot h2 {
  font-size: 0.95rem;
  margin: 0 0 0.45rem;
  color: #fff;
}

.foot ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.foot li {
  margin: 0.25rem 0;
}

.stamp {
  margin: 1.2rem 0 0;
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  color: #b7c3d8;
}

:focus-visible {
  outline: 3px solid var(--lime);
  outline-offset: 2px;
}

@media (max-width: 799px) {
  .brand-sub {
    display: none;
  }

  .nav-cta {
    padding: 0.45rem 0.7rem;
  }
}

@media (min-width: 800px) {
  .topbar {
    grid-template-columns: auto minmax(0, 1fr) auto;
    padding: 0 1.25rem;
  }

  .nav-panel {
    justify-self: end;
  }

  .nav-toggle {
    display: none;
  }

  .nav-panel,
  .nav-panel.is-open {
    display: flex;
    position: static;
    padding: 0;
    border: 0;
    background: transparent;
    align-items: center;
    gap: 0.35rem;
  }

  .nav-panel ul {
    display: flex;
    gap: 0.2rem;
  }

  .nav-panel a {
    min-height: 2.4rem;
    padding: 0 0.55rem;
    border: 0;
    font-size: 0.95rem;
  }

  .hero-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: center;
  }

  .devices {
    grid-template-columns: 1fr 1fr 1fr;
  }

  .foot-grid {
    grid-template-columns: 1.4fr 0.8fr 0.8fr;
  }
}

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