:root {
  --ironway-terracotta: #C66B4E;
  --ironway-teal: #14545C;
  --ironway-ivory: #F7F4ED;
  --ironway-charcoal: #253238;
  --ironway-mustard: #D6A64B;

  --bg: var(--ironway-ivory);
  --fg: var(--ironway-charcoal);
  --accent: var(--ironway-terracotta);
  --accent-press: #B05B40;
  --signal: var(--ironway-mustard);
  --link: var(--ironway-teal);
  --muted: color-mix(in srgb, var(--fg) 68%, var(--bg));
  --rule: color-mix(in srgb, var(--fg) 14%, var(--bg));
  --card: #FFFDF8;
  --card-edge: color-mix(in srgb, var(--fg) 10%, var(--bg));
  --code-bg: color-mix(in srgb, var(--fg) 7%, var(--bg));
  --header-bg: var(--ironway-ivory);

  --night: #1C2629;
  --night-deep: #162024;
  --night-card: color-mix(in srgb, var(--ironway-charcoal) 82%, var(--ironway-teal));
  --night-rule: color-mix(in srgb, var(--ironway-ivory) 12%, var(--night));
  --night-fg: var(--ironway-ivory);
  --night-muted: color-mix(in srgb, var(--ironway-ivory) 72%, var(--night));

  --shadow-card: 0 1px 2px rgba(37, 50, 56, 0.06), 0 6px 16px -10px rgba(37, 50, 56, 0.25);

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

  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: var(--night-deep);
    --fg: var(--ironway-ivory);
    --accent: var(--ironway-terracotta);
    --link: color-mix(in srgb, var(--ironway-teal) 40%, var(--ironway-ivory));
    --card: var(--night-card);
    --card-edge: var(--night-rule);
    --header-bg: var(--night);
    --shadow-card: none;
  }
}

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

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.6;
  overflow-wrap: anywhere;
}

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

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

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

h1,
h2,
h3 {
  line-height: 1.2;
  letter-spacing: -0.015em;
}

code,
pre {
  font-family: var(--mono);
  font-size: 0.875em;
}

code {
  background: var(--code-bg);
  padding: 0.1em 0.35em;
  border-radius: 4px;
}

pre {
  background: var(--night);
  color: var(--night-fg);
  padding: 0.9rem 1.1rem;
  border-radius: 8px;
  max-width: 100%;
  overflow-x: auto;
  overflow-wrap: normal;
  line-height: 1.55;
}

pre code {
  background: none;
  padding: 0;
  color: inherit;
}

/* ---- the shared frame: header, footer, and a page's reading column ---- */

.site-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem 1.5rem;
  padding: 1rem max(1rem, calc((100% - 72rem) / 2));
  background: var(--header-bg);
  border-bottom: 3px solid var(--accent);
}

.site-header > a {
  display: inline-block;
}

.site-header img {
  display: block;
  height: 2rem;
  width: auto;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.25rem 1.25rem;
  font-size: 0.925rem;
  font-weight: 600;
}

.site-nav a {
  color: var(--fg);
  text-decoration: none;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--accent);
}

.site-nav .nav-cta {
  background: var(--accent);
  color: var(--ironway-ivory);
  padding: 0.4rem 0.9rem;
  border-radius: 6px;
}

.site-nav .nav-cta:hover {
  background: var(--accent-press);
  color: var(--ironway-ivory);
}

main:not(.landing) {
  width: 100%;
  max-width: 48rem;
  margin: 0 auto;
  padding: 1.5rem 1rem 1rem;
}

main:not(.landing) h1 {
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  margin: 1rem 0 0.75rem;
}

main:not(.landing) h2 {
  margin-top: 2.25rem;
  padding-top: 1rem;
  border-top: 1px solid var(--rule);
}

main:not(.landing) h1,
main:not(.landing) h2 {
  color: var(--fg);
}

.site-footer {
  margin-top: 3rem;
  padding: 1.75rem max(1rem, calc((100% - 72rem) / 2)) 2.5rem;
  background: var(--night);
  color: var(--night-muted);
  font-size: 0.875rem;
}

.site-footer a {
  color: var(--night-fg);
}

.site-footer p {
  margin: 0.25rem 0;
}

.table-wrap {
  max-width: 100%;
  overflow-x: auto;
}

table {
  border-collapse: collapse;
  width: 100%;
}

th,
td {
  text-align: left;
  padding: 0.45rem 0.6rem;
  border-bottom: 1px solid var(--rule);
}

.button {
  display: inline-block;
  background: var(--accent);
  color: var(--ironway-ivory);
  padding: 0.6rem 1.2rem;
  border: 1px solid var(--accent);
  border-radius: 6px;
  text-decoration: none;
  font-weight: 600;
}

.button:hover {
  background: var(--accent-press);
  border-color: var(--accent-press);
  color: var(--ironway-ivory);
}

.button.ghost {
  background: transparent;
  color: var(--night-fg);
  border-color: color-mix(in srgb, var(--ironway-ivory) 45%, transparent);
}

.button.ghost:hover {
  background: color-mix(in srgb, var(--ironway-ivory) 10%, transparent);
  color: var(--night-fg);
}

.button.lg {
  padding: 0.75rem 1.4rem;
  font-size: 1.05rem;
}

/* ---- the home page: hero, numbered cards, the dark band, the checks ---- */

.container {
  width: 100%;
  max-width: 72rem;
  margin: 0 auto;
  padding: 0 1rem;
}

.eyebrow,
.flow-tag {
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
}

.eyebrow {
  text-transform: uppercase;
  font-weight: 700;
  color: var(--accent);
  margin: 0 0 0.75rem;
}

.flow-tag {
  color: var(--muted);
  margin: 1.25rem 0 0;
}

.hero {
  background:
    radial-gradient(60rem 30rem at 85% 0%, color-mix(in srgb, var(--ironway-teal) 35%, transparent), transparent 70%),
    linear-gradient(180deg, var(--ironway-charcoal), var(--night));
  color: var(--night-fg);
  padding: 3.5rem 0 4rem;
}

.hero .eyebrow {
  color: var(--signal);
}

.hero .flow-tag {
  color: var(--night-muted);
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
  gap: 2.5rem;
  align-items: center;
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3.25rem);
  margin: 0 0 1rem;
  letter-spacing: -0.03em;
}

.hero h1 em {
  font-style: normal;
  color: var(--accent);
}

.lede {
  font-size: 1.075rem;
  color: var(--night-muted);
  margin: 0 0 1.5rem;
}

.lede strong {
  color: var(--night-fg);
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.signal-box {
  margin: 0;
  background: var(--night-deep);
  border: 1px solid var(--night-rule);
  border-radius: 12px;
  padding: 1rem 1rem 0.85rem;
  box-shadow: 0 30px 60px -30px rgba(0, 0, 0, 0.6);
}

.signal-box svg {
  display: block;
  width: 100%;
  height: auto;
}

.signal-box figcaption {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--night-muted);
  margin-top: 0.5rem;
}

.lamp {
  animation: lamp 2.4s ease-in-out infinite;
}

@keyframes lamp {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.35; }
}

@media (prefers-reduced-motion: reduce) {
  .lamp {
    animation: none;
  }
}

.section {
  padding: 3.5rem 0;
}

.section h2 {
  font-size: clamp(1.5rem, 3.2vw, 2rem);
  margin: 0 0 0.5rem;
}

.section-sub {
  color: var(--muted);
  max-width: 40rem;
  margin: 0 0 2rem;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(13rem, 1fr));
  gap: 1rem;
  padding: 0;
  margin: 0;
  list-style: none;
}

.card {
  background: var(--card);
  border: 1px solid var(--card-edge);
  border-radius: 10px;
  padding: 1.25rem;
  box-shadow: var(--shadow-card);
}

.card h3 {
  font-size: 1.025rem;
  margin: 0 0 0.4rem;
}

.card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.card .num {
  display: inline-grid;
  place-items: center;
  width: 1.75rem;
  height: 1.75rem;
  border-radius: 50%;
  background: var(--accent);
  color: var(--ironway-ivory);
  font-family: var(--mono);
  font-size: 0.8rem;
  font-weight: 700;
  margin-bottom: 0.85rem;
}

.cards.checks .card {
  border-top: 3px solid var(--signal);
}

.band {
  background: var(--night);
  color: var(--night-fg);
}

.band .section-sub {
  color: var(--night-muted);
}

.band-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.25fr);
  gap: 2.5rem;
  align-items: start;
}

.band .eyebrow {
  color: var(--signal);
}

.rails {
  display: grid;
  gap: 0.85rem;
  padding: 0;
  margin: 0;
  list-style: none;
}

.rails li {
  background: var(--night-card);
  border: 1px solid var(--night-rule);
  border-left: 3px solid var(--accent);
  border-radius: 8px;
  padding: 1rem 1.15rem;
}

.rails h3 {
  font-size: 1rem;
  margin: 0 0 0.3rem;
}

.rails p {
  margin: 0;
  color: var(--night-muted);
  font-size: 0.95rem;
}

.rails code,
.band code {
  background: color-mix(in srgb, var(--ironway-ivory) 10%, transparent);
  color: var(--night-fg);
}

.standalone {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
  gap: 2rem;
  align-items: start;
}

.standalone p {
  margin: 0 0 1rem;
}

.family {
  display: grid;
  gap: 0.6rem;
  padding: 0;
  margin: 0;
  list-style: none;
}

.family li {
  display: flex;
  gap: 0.75rem;
  align-items: baseline;
  padding: 0.6rem 0.85rem;
  border: 1px solid var(--card-edge);
  border-radius: 8px;
  background: var(--card);
  font-size: 0.925rem;
}

.family li.is-here {
  border-color: var(--accent);
}

.family .name {
  font-weight: 700;
  min-width: 6.5rem;
}

.family .what {
  color: var(--muted);
}

.install-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr);
  gap: 2rem;
  align-items: center;
  background: var(--card);
  border: 1px solid var(--card-edge);
  border-radius: 12px;
  padding: 2rem;
  box-shadow: var(--shadow-card);
}

.install-card h2 {
  margin-top: 0;
}

.install-card pre {
  margin: 0;
}

.install-card .fine {
  color: var(--muted);
  font-size: 0.9rem;
  margin: 1rem 0 0;
}

.prompt {
  color: var(--signal);
  user-select: none;
}

.comment {
  color: var(--night-muted);
}

@media (max-width: 52rem) {
  .hero-grid,
  .band-grid,
  .standalone,
  .install-card {
    grid-template-columns: minmax(0, 1fr);
  }

  .hero {
    padding: 2.5rem 0 3rem;
  }

  .install-card {
    padding: 1.25rem;
  }
}

.plain {
  max-width: 46rem;
  margin: 0 0 1rem;
}