/* steamtrain.app — landing styles */

:root {
  --cream: #f3f1ec;
  --cream-band: #ece9e2;
  --card: #fbfaf7;
  --rule: #ddd9d0;
  --rule-alt: #d9d5cc;

  --ink: #14181d;
  --body: #5b6069;
  --body-strong: #3d4249;
  --muted-light: #8a8f97;

  --night: #0c0e11;
  --night-2: #0e1114;
  --night-3: #101317;
  --night-4: #080a0c;
  --line-1: #1b1f25;
  --line-2: #232830;
  --line-3: #2f3742;

  --on-night: #e6eaef;
  --on-night-muted: #98a2af;
  --on-night-dim: #6c7784;
  --on-night-faint: #3a424d;

  --teal: #34d3c4;
  --teal-bright: #7eefe4;
  --teal-deep: #0f6f66;
  --teal-ink: #07110f;

  --mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --sans: "IBM Plex Sans", "Helvetica Neue", Helvetica, Arial, sans-serif;

  --shell: 1240px;
  --gutter: 40px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--cream);
  color: var(--ink);
  font-family: var(--sans);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a { color: var(--teal-deep); text-decoration: none; }
a:hover { color: var(--ink); }

::selection { background: #b8ece5; color: var(--ink); }

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

.shell {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.mono { font-family: var(--mono); }

.eyebrow {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--teal);
  color: var(--teal-ink);
  padding: 10px 16px;
  border-radius: 0 0 8px 0;
  font-weight: 600;
  z-index: 20;
}
.skip-link:focus { left: 0; color: var(--teal-ink); }

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

/* ---------------------------------------------------------------- masthead */

.masthead { background: var(--night); color: var(--on-night); }

.nav {
  height: 66px;
  display: flex;
  align-items: center;
  gap: 13px;
  border-bottom: 1px solid var(--line-1);
}

.nav__mark { display: block; flex: none; }

.nav__word {
  font-size: 16px;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.nav__spacer { flex: 1; }

.nav__links {
  display: flex;
  align-items: center;
  gap: 26px;
  font-size: 14px;
  color: var(--on-night-muted);
}
.nav__links a { color: var(--on-night-muted); }
.nav__links a:hover { color: var(--on-night); }

.nav__version {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--on-night-dim);
  border: 1px solid var(--line-2);
  border-radius: 4px;
  padding: 3px 7px;
}

/* -------------------------------------------------------------------- hero */

.hero {
  padding: 27px var(--gutter) 72px;
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.1fr);
  gap: 60px;
  align-items: center;
}

.hero__kicker {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--teal);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 24px;
}

.hero__title {
  margin: 0 0 24px;
  font-size: 56px;
  line-height: 1.02;
  letter-spacing: -0.04em;
  font-weight: 600;
  text-wrap: balance;
}

.hero__lede {
  margin: 0 0 34px;
  font-size: 19px;
  line-height: 1.58;
  color: var(--on-night-muted);
  max-width: 30em;
  text-wrap: pretty;
}

.hero__actions {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}

.hero__note { font-size: 14.5px; color: var(--on-night-dim); }

.btn-primary {
  background: var(--teal);
  color: var(--teal-ink);
  font-weight: 600;
  font-size: 15px;
  border-radius: 8px;
  padding: 14px 22px;
  display: inline-block;
  transition: background 0.18s ease;
}
.btn-primary:hover { background: var(--teal-bright); color: var(--teal-ink); }

/* ------------------------------------------------------------ surface swap */

.surface__head {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
}

.surface__label {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--on-night-dim);
  margin-right: 4px;
}

.surface__tabs {
  display: flex;
  gap: 4px;
  border: 1px solid var(--line-2);
  border-radius: 8px;
  padding: 3px;
  background: var(--night-2);
}

.surface__tab {
  border: 0;
  border-radius: 6px;
  padding: 6px 13px;
  font-family: var(--sans);
  font-size: 12.5px;
  font-weight: 600;
  cursor: pointer;
  background: transparent;
  color: var(--on-night-muted);
  transition: background 0.18s ease, color 0.18s ease;
}
.surface__tab:hover { color: var(--on-night); }
.surface__tab[aria-selected="true"] {
  background: var(--teal);
  color: var(--teal-ink);
}

.window {
  border: 1px solid var(--line-3);
  border-radius: 12px;
  overflow: hidden;
  background: var(--night-2);
  box-shadow: 0 40px 80px -34px rgba(0, 0, 0, 0.95);
}

.window__bar {
  height: 32px;
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 0 14px;
  background: var(--night-3);
  border-bottom: 1px solid var(--line-1);
}

.window__dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--line-3);
  display: inline-block;
}

.window__spacer { flex: 1; }

.window__caption {
  font-family: var(--mono);
  font-size: 10.5px;
  color: var(--on-night-dim);
}

.window__shot { display: block; width: 100%; height: auto; }
.window__shot[hidden] { display: none; }

/* ------------------------------------------------------------ install band */

.board {
  background: var(--ink);
  border-bottom: 1px solid var(--line-2);
  scroll-margin-top: 0;
}

.board__grid {
  padding: 34px var(--gutter);
  display: grid;
  grid-template-columns: auto 1fr 1fr;
  gap: 30px;
  align-items: center;
}

.board__lede {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--on-night-dim);
  line-height: 1.7;
  max-width: 9em;
}

.board__col {
  border-left: 1px solid var(--line-3);
  padding-left: 30px;
}

.board__head {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}

.board__title { font-size: 15px; font-weight: 600; color: var(--on-night); }

.board__meta {
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--on-night-dim);
}

.btn-download {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--teal);
  color: var(--teal-ink);
  font-weight: 600;
  font-size: 14.5px;
  border-radius: 8px;
  padding: 12px 20px;
  transition: background 0.18s ease;
}
.btn-download:hover { background: var(--teal-bright); color: var(--teal-ink); }

.copy-line {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  width: 100%;
  background: var(--night-4);
  border: 1px solid var(--line-3);
  border-radius: 8px;
  padding: 12px 14px;
  cursor: pointer;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--on-night);
  text-align: left;
  transition: border-color 0.18s ease;
}
.copy-line:hover { border-color: var(--teal); }
.copy-line__cmd { overflow-x: auto; white-space: nowrap; }
.copy-line__state { color: var(--teal); font-size: 11px; flex: none; }

/* ------------------------------------------------------------ agents strip */

.agents {
  background: var(--night-2);
  border-bottom: 1px solid var(--rule-alt);
}

.agents__row {
  padding: 20px var(--gutter);
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--on-night-muted);
}

.agents__label {
  color: var(--on-night-dim);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  font-size: 11px;
  margin-right: 8px;
}

.agents__item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 8px;
}

.agents__dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: #3fb950;
  display: inline-block;
}

/* ------------------------------------------------------------------- stops */

.lines { padding: 88px var(--gutter) 20px; }

.lines__title {
  margin: 0 0 14px;
  font-size: 40px;
  letter-spacing: -0.035em;
  font-weight: 600;
  max-width: 16em;
}

.lines__lede {
  margin: 0 0 64px;
  font-size: 18px;
  line-height: 1.6;
  color: var(--body);
  max-width: 40em;
}

.stop {
  display: grid;
  grid-template-columns: 56px minmax(0, 0.85fr) minmax(0, 1.15fr);
  gap: 34px;
  align-items: start;
  padding: 34px 0;
  border-top: 1px solid var(--rule);
}

.stop__num {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--teal-deep);
  padding-top: 6px;
}

.stop__title {
  margin: 0 0 12px;
  font-size: 25px;
  letter-spacing: -0.02em;
  font-weight: 600;
  line-height: 1.2;
}

.stop__body {
  margin: 0;
  font-size: 16px;
  line-height: 1.65;
  color: var(--body);
}

.stop__term {
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.9;
  color: var(--body-strong);
  background: var(--card);
  border: 1px solid var(--rule);
  border-radius: 10px;
  padding: 18px 20px;
  overflow-x: auto;
}
.stop__term > div { white-space: pre; }

/* ---------------------------------------------------------------- pipeline */

.mainline {
  border-top: 1px solid var(--rule);
  background: var(--cream-band);
}

.mainline__grid {
  padding: 80px var(--gutter) 84px;
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
  gap: 56px;
  align-items: start;
}

.mainline__aside { position: sticky; top: 32px; }

.mainline__eyebrow { color: var(--teal-deep); margin-bottom: 16px; }

.mainline__title {
  margin: 0 0 16px;
  font-size: 34px;
  letter-spacing: -0.03em;
  font-weight: 600;
  line-height: 1.12;
}

.mainline__body {
  margin: 0 0 20px;
  font-size: 16.5px;
  line-height: 1.65;
  color: var(--body);
}
.mainline__body:last-of-type { margin-bottom: 24px; }

.mainline__cmd {
  font-family: var(--mono);
  font-size: 12.5px;
  line-height: 1.8;
  color: var(--body-strong);
  background: var(--card);
  border: 1px solid var(--rule);
  border-radius: 10px;
  padding: 16px 18px;
  white-space: pre-wrap;
  margin: 0;
}

.pipeline {
  display: flex;
  flex-direction: column;
  align-items: stretch;
}

.pipeline__row {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 100%;
}

.pipeline__connector {
  width: 1px;
  height: 26px;
  background: var(--rule);
  transition: background 0.35s ease;
}
.pipeline__row.is-reached .pipeline__connector { background: var(--teal-deep); }

.pipeline__nodes {
  display: flex;
  gap: 12px;
  width: 100%;
  flex-wrap: wrap;
}

.node {
  flex: 1 1 0;
  min-width: 0;
  background: var(--card);
  border: 1px solid var(--rule);
  border-radius: 10px;
  padding: 14px 16px;
  transition: background 0.35s ease, border-color 0.35s ease, box-shadow 0.35s ease;
}
.node--full { flex: 1 1 100%; }

.node__head {
  display: flex;
  align-items: center;
  gap: 9px;
  margin-bottom: 6px;
}

.node__dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--rule);
  flex: none;
  transition: background 0.35s ease;
}

.node__label {
  font-family: var(--mono);
  font-size: 13.5px;
  font-weight: 500;
  color: var(--muted-light);
  transition: color 0.35s ease;
}

.node__spacer { flex: 1; }

.node__badge {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: #b3b5ba;
  flex: none;
  transition: color 0.35s ease;
}

.node__sub {
  font-size: 13px;
  line-height: 1.5;
  color: #a8aab0;
  transition: color 0.35s ease;
}

.node__kind {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: #b3b5ba;
  margin-top: 8px;
  transition: color 0.35s ease;
}

.node.is-done {
  background: #f5f8f4;
  border-color: #c3d6c1;
}
.node.is-running {
  background: #ffffff;
  border-color: var(--accent);
  box-shadow: 0 6px 22px -10px var(--accent);
}

.node.is-done .node__label,
.node.is-running .node__label { color: var(--ink); }

.node.is-done .node__sub,
.node.is-running .node__sub { color: var(--body); }

.node.is-done .node__kind,
.node.is-running .node__kind { color: var(--accent); }

.node.is-done .node__dot { background: #3f9a4e; }
.node.is-running .node__dot { background: var(--accent); }

.node.is-done .node__badge { color: #3f9a4e; }
.node.is-running .node__badge { color: var(--accent); }

/* --------------------------------------------------------------- tui panel */

.tui { padding: 56px var(--gutter) 88px; }

.tui__card {
  background: var(--night);
  border-radius: 16px;
  overflow: hidden;
  color: var(--on-night);
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.25fr);
}

.tui__copy { padding: 52px 44px; }

.tui__eyebrow { color: var(--teal); margin-bottom: 18px; }

.tui__title {
  margin: 0 0 16px;
  font-size: 30px;
  letter-spacing: -0.028em;
  font-weight: 600;
  line-height: 1.15;
}

.tui__body {
  margin: 0 0 26px;
  font-size: 16.5px;
  line-height: 1.65;
  color: var(--on-night-muted);
}

.tui__body kbd {
  font-family: var(--mono);
  font-size: inherit;
  color: var(--on-night);
  background: none;
}

.tui__cmds {
  font-family: var(--mono);
  font-size: 13px;
  line-height: 2.1;
  color: var(--on-night-muted);
  border-top: 1px solid var(--line-2);
  padding-top: 20px;
  margin: 0;
  overflow-x: auto;
}
.tui__cmds .prompt { color: var(--on-night-faint); }
.tui__cmds .cmd { color: var(--on-night); }

.tui__shot {
  padding: 52px 44px 52px 0;
  display: flex;
  align-items: center;
}

.tui__frame {
  border: 1px solid var(--line-3);
  border-radius: 11px;
  overflow: hidden;
  width: 100%;
  background: var(--night-2);
}
.tui__frame img { display: block; width: 100%; height: auto; }

/* --------------------------------------------------------------- final cta */

.aboard {
  border-top: 1px solid var(--rule);
  background: var(--cream-band);
}

.aboard__inner {
  padding: 76px var(--gutter) 84px;
  text-align: center;
}

.aboard__title {
  margin: 0 0 12px;
  font-size: 38px;
  letter-spacing: -0.035em;
  font-weight: 600;
}

.aboard__lede {
  margin: 0 auto 38px;
  font-size: 17.5px;
  line-height: 1.6;
  color: var(--body);
  max-width: 34em;
}

.aboard__cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  max-width: 860px;
  margin: 0 auto;
  text-align: left;
}

.aboard__card {
  background: var(--card);
  border: 1px solid var(--rule);
  border-radius: 12px;
  padding: 28px;
}

.aboard__eyebrow { color: var(--teal-deep); margin-bottom: 14px; }

.btn-dark {
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--ink);
  color: var(--cream);
  font-weight: 600;
  font-size: 15px;
  border-radius: 8px;
  padding: 13px 16px;
  margin-bottom: 16px;
  transition: background 0.18s ease;
}
.btn-dark:hover { background: var(--teal-deep); color: var(--cream); }

.copy-line--dark {
  background: var(--ink);
  border-color: var(--ink);
  padding: 13px 14px;
  margin-bottom: 16px;
}
.copy-line--dark:hover { border-color: var(--teal-deep); }

.aboard__note {
  font-size: 14.5px;
  color: var(--body);
  line-height: 1.75;
}

.aboard__fine {
  margin-top: 14px;
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--muted-light);
  line-height: 1.6;
}

.aboard__cmds {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--body);
  line-height: 1.95;
  margin: 0;
  overflow-x: auto;
}
.aboard__cmds .prompt { color: #a3a7ad; }

/* ------------------------------------------------------------------ footer */

.foot { background: var(--night); color: var(--on-night-dim); }

.foot__row {
  padding: 32px var(--gutter) 42px;
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.foot__mark { display: block; flex: none; opacity: 0.6; }

.foot__word { font-size: 14px; }

.foot__spacer { flex: 1; }

.foot__links {
  display: flex;
  gap: 24px;
  font-size: 14px;
  color: var(--on-night-muted);
}
.foot__links a { color: var(--on-night-muted); }
.foot__links a:hover { color: var(--on-night); }

/* ------------------------------------------------------------- responsive */

@media (max-width: 1080px) {
  .hero {
    grid-template-columns: minmax(0, 1fr);
    gap: 48px;
    padding-top: 21px;
    padding-bottom: 56px;
  }
  .hero__title { font-size: 46px; }

  .mainline__grid { grid-template-columns: minmax(0, 1fr); gap: 40px; }
  .mainline__aside { position: static; }

  .tui__card { grid-template-columns: minmax(0, 1fr); }
  .tui__copy { padding: 40px 32px 8px; }
  .tui__shot { padding: 24px 32px 40px; }
}

@media (max-width: 900px) {
  .board__grid { grid-template-columns: minmax(0, 1fr); gap: 24px; }
  .board__lede { max-width: none; }
  .board__col { border-left: 0; border-top: 1px solid var(--line-3); padding-left: 0; padding-top: 22px; }

  .stop { grid-template-columns: 40px minmax(0, 1fr); gap: 20px; }
  .stop__term { grid-column: 2; }

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

@media (max-width: 720px) {
  :root { --gutter: 22px; }

  .nav { height: auto; padding-top: 14px; padding-bottom: 14px; flex-wrap: wrap; }
  .nav__spacer { display: none; }
  .nav__links { gap: 16px; width: 100%; flex-wrap: wrap; font-size: 13.5px; }

  .hero__title { font-size: 36px; }
  .hero__lede { font-size: 17px; }

  .lines { padding-top: 56px; }
  .lines__title { font-size: 30px; }
  .mainline__grid { padding-top: 56px; padding-bottom: 56px; }
  .mainline__title { font-size: 27px; }
  .tui { padding-top: 40px; padding-bottom: 56px; }
  .tui__title { font-size: 25px; }
  .aboard__inner { padding-top: 56px; padding-bottom: 60px; }
  .aboard__title { font-size: 30px; }

  .stop { grid-template-columns: minmax(0, 1fr); gap: 16px; }
  .stop__num { padding-top: 0; }
  .stop__term { grid-column: 1; }

  .pipeline__nodes { flex-direction: column; }
  .node { flex: 1 1 auto; }

  .copy-line { font-size: 12px; }
  .foot__spacer { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; }
}

/* ================================================================== docs page */

.crumb__sep { font-size: 16px; color: var(--on-night-faint); }
.crumb__here { font-size: 16px; color: var(--on-night-muted); }

.nav__brand {
  display: flex;
  align-items: center;
  gap: 13px;
  color: var(--on-night);
}
.nav__brand:hover { color: var(--on-night); }

.docs-intro { border-bottom: 1px solid var(--rule); }

.docs-intro__grid {
  padding: 66px var(--gutter) 54px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 0.85fr);
  gap: 56px;
  align-items: end;
}

.docs-intro__title {
  margin: 0 0 16px;
  font-size: 46px;
  line-height: 1.05;
  letter-spacing: -0.038em;
  font-weight: 600;
}

.docs-intro__lede {
  margin: 0;
  font-size: 18px;
  line-height: 1.6;
  color: var(--body);
  max-width: 34em;
}

.docs-intro__card {
  background: var(--card);
  border: 1px solid var(--rule);
  border-radius: 12px;
  padding: 22px 24px;
}

.docs-intro__eyebrow { color: var(--teal-deep); margin: 0 0 12px; }

.docs-intro__cmds {
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.95;
  color: var(--body-strong);
  overflow-x: auto;
}
.docs-intro__cmds .prompt { color: #a3a7ad; }

.docs-intro__note {
  margin: 12px 0 0;
  font-size: 13.5px;
  color: var(--body);
  line-height: 1.6;
}

.docs-index { padding: 16px var(--gutter) 80px; }

.docs-group {
  display: grid;
  grid-template-columns: 230px minmax(0, 1fr);
  gap: 44px;
  padding: 38px 0;
  border-bottom: 1px solid var(--rule);
  align-items: start;
}

.docs-group__head { position: sticky; top: 24px; }

.docs-group__num { color: var(--teal-deep); margin: 0 0 8px; }

.docs-group__title {
  margin: 0 0 8px;
  font-size: 22px;
  letter-spacing: -0.02em;
  font-weight: 600;
  line-height: 1.2;
}

.docs-group__note {
  margin: 0;
  font-size: 14px;
  line-height: 1.55;
  color: var(--muted-light);
}

.docs-group__cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.doc-card {
  display: block;
  background: var(--card);
  border: 1px solid var(--rule);
  border-radius: 10px;
  padding: 16px 18px;
  color: var(--ink);
  transition: border-color 0.18s ease, background 0.18s ease;
}
.doc-card:hover {
  border-color: var(--teal-deep);
  background: #ffffff;
  color: var(--ink);
}

.doc-card__name {
  font-family: var(--mono);
  font-size: 13.5px;
  font-weight: 500;
  color: var(--teal-deep);
  margin-bottom: 6px;
}

.doc-card__desc {
  font-size: 13.5px;
  line-height: 1.55;
  color: var(--body);
}

@media (max-width: 1080px) {
  .docs-intro__grid { grid-template-columns: minmax(0, 1fr); gap: 36px; align-items: start; }
  .docs-group { grid-template-columns: 190px minmax(0, 1fr); gap: 28px; }
}

@media (max-width: 780px) {
  .docs-group { grid-template-columns: minmax(0, 1fr); gap: 20px; }
  .docs-group__head { position: static; }
  .docs-group__cards { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 720px) {
  .docs-intro__grid { padding-top: 48px; padding-bottom: 40px; }
  .docs-intro__title { font-size: 34px; }
  .docs-intro__lede { font-size: 16.5px; }
  .docs-index { padding-bottom: 56px; }
}