/* Hallmark · macrostructure: Workbench · N8 knobs: prompt=">", cursor=after-final-flag, width=content
 * Ft4 knobs: family=mono, layout=single block, includes=version+date+credits
 * genre: technical · theme: brand-locked (PocketTmux tokens · paper dark · display mono · accent warm 32°)
 * enrichment: none — real captures + typography · motion: load-stagger · caret · underline-thicken
 * Hallmark · pre-emit critique: P5 H4 E5 S5 R5 V4
 */

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

html { overflow-x: clip; scroll-behavior: smooth; }
body { overflow-x: clip; }

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

body {
  margin: 0;
  background: var(--color-paper);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: 400;
  line-height: 1.62;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  padding-inline: max(0px, env(safe-area-inset-left));
}

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.14;
  letter-spacing: -0.03em;
  overflow-wrap: anywhere;
  min-width: 0;
  margin: 0;
}

p { margin: 0; }
img { display: block; max-width: 100%; height: auto; }

code, kbd, pre { font-family: var(--font-display); }

code {
  font-size: 0.9em;
  color: var(--color-ink);
  background: var(--color-paper-2);
  border-radius: var(--radius-sm);
  padding: 0.1em 0.35em;
}

kbd {
  font-size: 0.82em;
  border: var(--rule-hair) solid var(--color-rule-2);
  border-radius: var(--radius-sm);
  padding: 0.05em 0.4em;
  color: var(--color-ink);
}

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

:focus-visible {
  outline: var(--rule-thick) solid var(--color-focus);
  outline-offset: 3px;
  /* focus rings never animate */
  transition: none;
}

.skip {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: var(--z-sticky);
  font-family: var(--font-display);
  font-size: var(--text-sm);
  background: var(--color-paper-3);
  padding: var(--space-sm) var(--space-md);
}
.skip:focus { left: var(--page-gutter); top: var(--space-xs); }

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

/* ---------------------------------------------------------------- nav (N8) */

.nav {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-md);
  flex-wrap: wrap;
  padding: var(--space-md) var(--page-gutter);
  border-bottom: var(--rule-hair) solid var(--color-rule);
}

.nav__line {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0 var(--space-ch);
  margin: 0;
}

.nav__prompt { color: var(--color-accent); }
.nav__cmd { color: var(--color-ink); }

.nav__flag,
.nav__repo {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  white-space: nowrap;
  color: var(--color-muted);
  text-decoration: underline;
  text-decoration-color: var(--color-rule-2);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: color var(--dur-micro) var(--ease-out),
              text-decoration-color var(--dur-micro) var(--ease-out);
}

.nav__flag:hover,
.nav__repo:hover,
.nav__flag:focus-visible,
.nav__repo:focus-visible {
  color: var(--color-ink);
  text-decoration-color: var(--color-accent);
  text-decoration-thickness: 2px;
}
.nav__flag:active, .nav__repo:active { color: var(--color-accent); }

.caret {
  display: inline-block;
  width: 1ch;
  color: var(--color-accent);
  animation: blink 1.05s steps(2) infinite;
}
@keyframes blink { 50% { opacity: 0; } }

/* ------------------------------------------------------------------ layout */

main {
  display: grid;
  /* minmax(0, 1fr): a <pre> with long lines must not push the track to its
     max-content width — that is what makes the page overflow at 320-414 px. */
  grid-template-columns: minmax(0, 1fr);
  /* rhythm is deliberately uneven: the tour breathes, the spec sheet is tight */
  gap: var(--space-3xl);
  padding-block: var(--space-2xl) var(--space-3xl);
}

section { padding-inline: var(--page-gutter); min-width: 0; }

.section__title {
  font-size: var(--text-xl);
  max-width: 30ch;
  margin-bottom: var(--space-xl);
  padding-top: var(--space-md);
  border-top: var(--rule-thick) solid var(--color-accent);
  display: inline-block;
}

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

.hero {
  display: grid;
  padding-block: var(--space-md) var(--space-2xl);
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-2xl);
  align-items: start;
}

.hero__text, .step__body, .how__prose, .how__trace { min-width: 0; }

.hero__title {
  font-size: var(--text-display);
  max-width: 22ch;
}

.hero__lede {
  margin-top: var(--space-lg);
  max-width: 58ch;
  color: var(--color-muted);
  font-size: var(--text-md);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm) var(--space-md);
  margin-top: var(--space-xl);
}

.hero__meta {
  margin-top: var(--space-md);
  font-family: var(--font-display);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  color: var(--color-muted);
}

.hero__figure { margin: 0; max-width: 30rem; }

.hero__figure img,
.shot img {
  border: var(--rule-hair) solid var(--color-rule);
  border-radius: var(--radius-md);
}

.hero__figure figcaption,
.shot figcaption {
  margin-top: var(--space-sm);
  font-family: var(--font-display);
  font-size: var(--text-xs);
  color: var(--color-muted);
  max-width: 40ch;
}

/* ------------------------------------------------------------- code blocks */

.cmd, .trace {
  min-width: 0;
  font-size: var(--text-sm);
  line-height: 1.7;
  margin: var(--space-xl) 0 0;
  padding: var(--space-md) 0;
  border-top: var(--rule-hair) solid var(--color-rule);
  border-bottom: var(--rule-hair) solid var(--color-rule);
  overflow-x: auto;
  color: var(--color-ink);
  white-space: pre;
}

.cmd__sigil { color: var(--color-accent); padding-right: var(--space-ch); }
.cmd__out { color: var(--color-muted); }
.cmd--build { margin-top: var(--space-2xl); }

/* -------------------------------------------------------------------- tour */

.step {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-lg) var(--space-2xl);
  margin-bottom: var(--space-3xl);
  align-items: start;
}
.step:last-child { margin-bottom: 0; }

.step__body h3 {
  font-size: var(--text-lg);
  margin-bottom: var(--space-sm);
}

.step__body p {
  color: var(--color-muted);
  max-width: 54ch;
}

.shot { margin: 0; }
.shot--phone { max-width: 17rem; }
.shot--wide { max-width: 23rem; }

/* The Sessions screen only fills the top half of the device; showing the empty
   remainder would drag the whole row's height with it. Crop, don't letterbox. */
.shot--trim img { aspect-ratio: 620 / 760; object-fit: cover; object-position: top center; }

/* --------------------------------------------------------------------- how */

.how__grid { display: grid; grid-template-columns: minmax(0, 1fr); gap: var(--space-2xl); }

.how__prose p { color: var(--color-muted); max-width: 56ch; }
.how__prose p + p { margin-top: var(--space-md); }

.how__link {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  margin-top: var(--space-lg);
}

.how__link a,
.colophon a {
  color: var(--color-ink);
  text-decoration: underline;
  text-decoration-color: var(--color-accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: text-decoration-thickness var(--dur-micro) var(--ease-out),
              color var(--dur-micro) var(--ease-out);
}
.how__link a { font-family: var(--font-display); font-size: var(--text-sm); white-space: nowrap; }

.how__link a:hover, .colophon a:hover,
.how__link a:focus-visible, .colophon a:focus-visible {
  text-decoration-thickness: 2px;
}
.how__link a:active, .colophon a:active { color: var(--color-accent); }

.how__label {
  font-family: var(--font-display);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-muted);
}

.trace { margin-top: var(--space-sm); }
.trace__p { color: var(--color-muted); }
.trace__a { color: var(--color-accent); padding-inline: var(--space-ch-sm); }
.trace__d { color: var(--color-ink); }
/* the tmux-side lines are commentary, not frames — italic mono, still 5.6:1 */
.trace__c { color: var(--color-muted); font-style: italic; }

/* -------------------------------------------------------------------- spec */

.spec__table {
  width: 100%;
  border-collapse: collapse;
  font-variant-numeric: tabular-nums;
  text-align: left;
}

.spec__table th,
.spec__table td {
  border-top: var(--rule-hair) solid var(--color-rule);
  padding: var(--space-md) var(--space-md) var(--space-md) 0;
  vertical-align: baseline;
  font-weight: 400;
}

.spec__table th {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  color: var(--color-ink);
  white-space: nowrap;
  width: 12rem;
}

.spec__table td:first-of-type { font-size: var(--text-base); }
.spec__table td:last-child { color: var(--color-muted); font-size: var(--text-sm); }
.spec__table tr:last-child th,
.spec__table tr:last-child td { border-bottom: var(--rule-hair) solid var(--color-rule); }

/* Below 40rem the three columns cannot fit without clipping the last one, so
   each row becomes a small block: term on its own line, then the two values. */
@media (max-width: 39.999rem) {
  .spec__table, .spec__table tbody, .spec__table tr,
  .spec__table th, .spec__table td { display: block; width: auto; }
  .spec__table tr { border-top: var(--rule-hair) solid var(--color-rule); padding-block: var(--space-md); }
  .spec__table tr:last-child { border-bottom: var(--rule-hair) solid var(--color-rule); }
  .spec__table th, .spec__table td { border: 0; padding: 0; white-space: normal; }
  .spec__table th { color: var(--color-accent); margin-bottom: var(--space-2xs); }
  .spec__table td:last-child { margin-top: var(--space-2xs); }
}

/* --------------------------------------------------------------------- get */

.get__grid {
  display: grid;
  gap: var(--space-lg);
  grid-template-columns: minmax(0, 1fr);
}

.get__card {
  border-top: var(--rule-thick) solid var(--color-rule-2);
  padding-top: var(--space-md);
}

.get__card h3 { font-size: var(--text-md); }

.get__file {
  font-family: var(--font-display);
  font-size: var(--text-xs);
  color: var(--color-muted);
  margin-block: var(--space-xs) var(--space-sm);
  overflow-wrap: anywhere;
}
.get__size { color: var(--color-muted); font-variant-numeric: tabular-nums; }

.get__card p { color: var(--color-muted); font-size: var(--text-sm); }
.get__card p:last-child { margin-top: var(--space-md); }

/* ----------------------------------------------------------------- buttons */

.btn {
  display: inline-block;
  font-family: var(--font-display);
  font-size: var(--text-sm);
  white-space: nowrap;
  text-decoration: none;
  color: var(--color-ink);
  border: var(--rule-hair) solid var(--color-muted);
  border-radius: var(--radius-sm);
  padding: var(--space-sm) var(--space-md);
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  transition: border-color var(--dur-micro) var(--ease-out),
              color var(--dur-micro) var(--ease-out),
              transform var(--dur-micro) var(--ease-out);
}

.btn--primary { border-color: var(--color-accent); color: var(--color-accent); }

/* one hover signal: the affordance goes accent. The press is the only transform. */
@media (hover: hover) and (pointer: fine) {
  .btn:hover { border-color: var(--color-accent); color: var(--color-accent); }
  .btn--primary:hover { color: var(--color-accent-2); border-color: var(--color-accent-2); }
}
.btn:active { transform: translateY(1px); color: var(--color-accent-2); }

/* --------------------------------------------------------------- colophon */

.colophon {
  border-top: var(--rule-hair) solid var(--color-rule);
  padding: var(--space-xl) var(--page-gutter) max(var(--space-xl), env(safe-area-inset-bottom));
}

.colophon p {
  font-family: var(--font-display);
  font-size: var(--text-xs);
  line-height: 1.85;
  color: var(--color-muted);
  max-width: 74ch;
}

/* ------------------------------------------------------------ page reveal */

.reveal {
  opacity: 0;
  transform: translateY(8px);
  animation: reveal var(--dur-long) var(--ease-out) forwards;
  animation-delay: calc(var(--i, 0) * 60ms);
}
@keyframes reveal { to { opacity: 1; transform: none; } }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 150ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 150ms !important;
  }
  .caret { animation: none; opacity: 1; }
  .btn:hover { transform: none; }
}

/* ------------------------------------------------------------ breakpoints */

@media (min-width: 40rem) {
  .get__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--space-xl); }
  .step--terminal { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
  .step--terminal .step__body--span { grid-column: 1 / -1; }
  .section__title { font-size: var(--text-2xl); }
}

@media (min-width: 60rem) {
  .hero { grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr); gap: var(--space-3xl); }
  .hero__figure { justify-self: end; padding-top: var(--space-2xl); }

  /* Primary axis is left: every row starts at the gutter and stops where the
     measure stops, instead of stretching to the far edge on wide displays. */
  .step { justify-content: start; }
  .step--pair { grid-template-columns: minmax(0, 23rem) minmax(0, 32rem); }
  .step--sessions { grid-template-columns: minmax(0, 32rem) minmax(0, 16rem); }
  .step--terminal { grid-template-columns: minmax(0, 15rem) minmax(0, 15rem) minmax(0, 26rem); }
  .step--terminal .step__body--span { grid-column: auto; }

  .how__grid { grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr); gap: var(--space-3xl); }
  .how__link { flex-direction: row; flex-wrap: wrap; gap: var(--space-lg); }

  .get__grid { grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr) minmax(0, 0.95fr); }

  main { padding-block: var(--space-3xl) var(--space-4xl); gap: var(--space-4xl); }
  .spec { padding-top: var(--space-lg); }
  .get { padding-top: var(--space-xl); }
}

@media (min-width: 90rem) {
  section { max-width: 84rem; margin-inline: auto; width: 100%; }
  /* the colophon keeps a 74ch measure — only its container centres */
  .colophon { max-width: 84rem; margin-inline: auto; }
}