:root {
  --bg: #d5dee7;
  --panel: #f3f6f9;
  --inset: #e8eef3;
  --ink: #15202b;
  --muted: #5a6876;
  --faint: #7a8794;
  --line: #b7c3cf;
  --chrome: #1b2836;
  --chrome-2: #243344;
  --ok: #128a58;
  --ok-soft: #d7f0e4;
  --warn: #b56a0c;
  --warn-soft: #f6e6c8;
  --halt: #b42318;
  --halt-soft: #f6d6d2;
  --accent: #0b7480;
  --accent-deep: #085864;
  --led: #22c37a;
  --led-amber: #e3a008;
  --max: 1160px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background-color: var(--bg);
  background-image:
    linear-gradient(rgba(21, 32, 43, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(21, 32, 43, 0.045) 1px, transparent 1px);
  background-size: 28px 28px;
  font: 16px/1.65 system-ui, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

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

a {
  color: var(--accent-deep);
  text-underline-offset: 0.16em;
}

a:hover {
  color: var(--accent);
}

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

.skip {
  position: absolute;
  left: 12px;
  top: -52px;
  z-index: 90;
  padding: 0.45rem 0.75rem;
  background: var(--chrome);
  color: #fff;
}

.skip:focus {
  top: 12px;
}

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

.mono {
  font-family: ui-monospace, "Cascadia Mono", "Segoe UI Mono", "SFMono-Regular", Menlo, Consolas, monospace;
}

.mast {
  position: sticky;
  top: 0;
  z-index: 40;
  background: var(--chrome);
  border-bottom: 1px solid #314154;
}

.mast.is-stuck {
  box-shadow: 0 8px 24px rgba(21, 32, 43, 0.18);
}

.mast-inner {
  width: min(var(--max), calc(100% - 2rem));
  margin-inline: auto;
  min-height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  color: #e8eef4;
  text-decoration: none;
}

.brand img {
  width: 36px;
  height: 36px;
  object-fit: cover;
  border: 1px solid #3a4d62;
  background: #101820;
}

.brand strong {
  display: block;
  font-size: 0.95rem;
  letter-spacing: 0.02em;
}

.brand small {
  display: block;
  color: #9aabbc;
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-family: ui-monospace, "Cascadia Mono", Consolas, monospace;
}

.nav-toggle {
  display: none;
  border: 1px solid #4a5d72;
  background: var(--chrome-2);
  color: #e8eef4;
  padding: 0.45rem 0.7rem;
  font: inherit;
  cursor: pointer;
}

.nav ul {
  display: flex;
  align-items: center;
  gap: 0.15rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav a {
  display: inline-block;
  padding: 0.45rem 0.7rem;
  color: #c5d2de;
  text-decoration: none;
  font-size: 0.92rem;
}

.nav a:hover,
.nav a[aria-current="page"] {
  color: #fff;
  background: rgba(255, 255, 255, 0.06);
}

.nav a.cta {
  background: var(--accent);
  color: #fff;
  margin-left: 0.25rem;
}

.nav a.cta:hover {
  background: var(--accent-deep);
}

body.is-locked {
  overflow: hidden;
}

.hero {
  padding: 1.4rem 0 0.4rem;
}

.hero-panel,
.rack,
.faq-rack {
  background: var(--panel);
  border: 1px solid var(--line);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.65) inset, 0 10px 28px rgba(21, 32, 43, 0.07);
}

.bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem;
  padding: 0.5rem 0.85rem;
  background: var(--chrome);
  color: #d5deea;
  font-family: ui-monospace, "Cascadia Mono", Consolas, monospace;
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.bar-left,
.bar-right {
  display: flex;
  align-items: center;
  gap: 0.55rem;
}

.led {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--led);
  box-shadow: 0 0 7px rgba(34, 195, 122, 0.7);
}

.led.amber {
  background: var(--led-amber);
  box-shadow: 0 0 7px rgba(227, 160, 8, 0.65);
}

.led.halt {
  background: #ef4444;
  box-shadow: 0 0 7px rgba(239, 68, 68, 0.55);
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.18rem 0.5rem;
  border: 1px solid #3d5166;
  color: #b8c8d6;
}

.hero-body {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 1.4rem;
  padding: 1.25rem 1.1rem 1.15rem;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 0 0 0.7rem;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.18rem 0.5rem;
  border: 1px solid var(--line);
  background: var(--inset);
  color: var(--muted);
  font-size: 0.78rem;
  font-family: ui-monospace, "Cascadia Mono", Consolas, monospace;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.kicker {
  margin: 0 0 0.35rem;
  color: var(--accent-deep);
  font-family: ui-monospace, "Cascadia Mono", Consolas, monospace;
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  margin: 0 0 0.55rem;
  line-height: 1.25;
}

h1 {
  font-size: clamp(1.8rem, 3vw, 2.55rem);
}

h2 {
  font-size: 1.35rem;
}

h3 {
  font-size: 1.02rem;
}

.lead {
  margin: 0 0 1rem;
  color: var(--muted);
  max-width: 42rem;
}

.alert {
  margin: 0 0 1rem;
  padding: 0.75rem 0.85rem;
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  background: var(--inset);
}

.alert.warn {
  border-left-color: var(--warn);
  background: var(--warn-soft);
}

.alert.halt {
  border-left-color: var(--halt);
  background: var(--halt-soft);
}

.alert h3 {
  margin-bottom: 0.25rem;
  font-size: 0.95rem;
}

.alert p {
  margin: 0;
  color: var(--muted);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin: 0 0 1rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0.45rem 0.95rem;
  border: 1px solid transparent;
  text-decoration: none;
  font: inherit;
  font-size: 0.95rem;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}

.btn-primary:hover {
  background: var(--accent-deep);
  color: #fff;
}

.btn-ghost {
  background: transparent;
  border-color: var(--line);
  color: var(--ink);
}

.btn-ghost:hover {
  border-color: var(--accent);
  color: var(--accent-deep);
}

.metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.55rem;
}

.metric {
  padding: 0.7rem 0.75rem;
  border: 1px solid var(--line);
  background: #fff;
}

.metric b {
  display: block;
  font-size: 1.25rem;
  letter-spacing: 0.02em;
}

.metric span {
  display: block;
  margin-top: 0.15rem;
  color: var(--muted);
  font-size: 0.82rem;
}

.metric em {
  display: block;
  margin-top: 0.4rem;
  color: var(--faint);
  font-style: normal;
  font-family: ui-monospace, "Cascadia Mono", Consolas, monospace;
  font-size: 0.68rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.screen {
  margin: 0;
  border: 1px solid var(--line);
  background: #101820;
  padding: 0.45rem;
}

.screen img {
  width: 100%;
  height: auto;
  background: #0b1118;
}

.screen figcaption {
  padding: 0.45rem 0.2rem 0.15rem;
  color: #9aabbc;
  font-family: ui-monospace, "Cascadia Mono", Consolas, monospace;
  font-size: 0.68rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.strip {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.55rem;
  margin: 0.85rem 0 0;
}

.strip article {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  padding: 0.65rem 0.75rem;
  border: 1px solid var(--line);
  background: var(--inset);
}

.strip strong {
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-family: ui-monospace, "Cascadia Mono", Consolas, monospace;
}

.strip span {
  color: var(--muted);
  font-size: 0.86rem;
}

.section {
  padding: 1.15rem 0;
}

.rack-body {
  padding: 1rem 1.05rem 1.1rem;
}

.intro {
  margin: 0 0 0.95rem;
  color: var(--muted);
  max-width: 46rem;
}

.grid-4,
.grid-2 {
  display: grid;
  gap: 0.7rem;
}

.grid-4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.grid-2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.tile,
.os {
  display: block;
  padding: 0.85rem 0.9rem;
  border: 1px solid var(--line);
  background: #fff;
  color: inherit;
  text-decoration: none;
}

a.tile:hover,
a.os:hover {
  border-color: var(--accent);
}

.tile .code,
.os .code {
  display: inline-block;
  margin-bottom: 0.4rem;
  color: var(--accent-deep);
  font-family: ui-monospace, "Cascadia Mono", Consolas, monospace;
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.tile p,
.os p {
  margin: 0;
  color: var(--muted);
}

.tile p + p,
.os p + p {
  margin-top: 0.55rem;
}

.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.1rem;
  align-items: start;
}

.ticks {
  margin: 0 0 1rem;
  padding-left: 1.1rem;
  color: var(--muted);
}

.ticks li + li {
  margin-top: 0.35rem;
}

.faq-rack details {
  border-bottom: 1px solid var(--line);
}

.faq-rack details:last-child {
  border-bottom: 0;
}

.faq-rack summary {
  cursor: pointer;
  list-style: none;
  padding: 0.85rem 1.05rem;
  font-weight: 650;
}

.faq-rack summary::-webkit-details-marker {
  display: none;
}

.faq-rack summary::before {
  content: "+";
  display: inline-block;
  width: 1.1rem;
  margin-right: 0.4rem;
  color: var(--accent-deep);
  font-family: ui-monospace, "Cascadia Mono", Consolas, monospace;
}

.faq-rack details[open] summary::before {
  content: "-";
}

.faq-rack details p {
  margin: 0;
  padding: 0 1.05rem 0.95rem 2.55rem;
  color: var(--muted);
}

.crumb {
  margin: 0 0 0.7rem;
  color: var(--faint);
  font-family: ui-monospace, "Cascadia Mono", Consolas, monospace;
  font-size: 0.75rem;
  letter-spacing: 0.04em;
}

.page-hero {
  padding: 1.25rem 1.05rem 1.15rem;
}

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  background: #fff;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}

th,
td {
  padding: 0.65rem 0.75rem;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

th {
  background: var(--inset);
  font-family: ui-monospace, "Cascadia Mono", Consolas, monospace;
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
}

tr:last-child td {
  border-bottom: 0;
}

code {
  font-family: ui-monospace, "Cascadia Mono", Consolas, monospace;
  font-size: 0.86em;
  background: var(--inset);
  padding: 0.05em 0.3em;
}

.steps {
  display: grid;
  gap: 0.65rem;
}

.step {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.75rem;
  padding: 0.8rem 0.85rem;
  border: 1px solid var(--line);
  background: #fff;
}

.step b {
  width: 1.7rem;
  height: 1.7rem;
  display: grid;
  place-items: center;
  background: var(--chrome);
  color: #fff;
  font-family: ui-monospace, "Cascadia Mono", Consolas, monospace;
  font-size: 0.8rem;
}

.step p {
  margin: 0;
  color: var(--muted);
}

.foot {
  margin-top: 0.4rem;
  background: var(--chrome);
  color: #c5d2de;
}

.foot a {
  color: #d7e4ef;
}

.foot a:hover {
  color: #fff;
}

.foot-grid {
  width: min(var(--max), calc(100% - 2rem));
  margin-inline: auto;
  padding: 1.4rem 0 1.1rem;
  display: grid;
  grid-template-columns: 1.4fr 0.8fr 0.8fr 1.1fr;
  gap: 1.1rem;
}

.foot h3 {
  margin-bottom: 0.45rem;
  color: #fff;
  font-size: 0.86rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-family: ui-monospace, "Cascadia Mono", Consolas, monospace;
}

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

.foot li + li {
  margin-top: 0.3rem;
}

.foot p {
  margin: 0.55rem 0 0;
  color: #9aabbc;
}

.legal {
  width: min(var(--max), calc(100% - 2rem));
  margin-inline: auto;
  padding: 0.75rem 0 1.15rem;
  border-top: 1px solid #314154;
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem 1.2rem;
  color: #8ea0b2;
  font-size: 0.86rem;
}

[data-reveal] {
  opacity: 1;
  transform: none;
}

.motion-ok [data-reveal] {
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 0.45s ease, transform 0.45s ease;
}

.motion-ok [data-reveal].is-in {
  opacity: 1;
  transform: none;
}

@media (max-width: 980px) {
  .hero-body,
  .split,
  .grid-4,
  .foot-grid {
    grid-template-columns: 1fr 1fr;
  }

  .metrics,
  .strip {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 760px) {
  .nav-toggle {
    display: inline-flex;
  }

  .nav {
    display: none;
    position: absolute;
    left: 0;
    right: 0;
    top: 64px;
    background: var(--chrome-2);
    border-bottom: 1px solid #314154;
    padding: 0.6rem 1rem 0.9rem;
  }

  .nav.is-open {
    display: block;
  }

  .nav ul {
    flex-direction: column;
    align-items: stretch;
  }

  .nav a.cta {
    margin-left: 0;
    text-align: center;
  }

  .hero-body,
  .split,
  .grid-4,
  .grid-2,
  .metrics,
  .strip,
  .foot-grid {
    grid-template-columns: 1fr;
  }

  .legal {
    flex-direction: column;
  }
}

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

  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }

  .motion-ok [data-reveal] {
    opacity: 1;
    transform: none;
  }
}