/*
 * codsh — the site is typeset the way the tool renders.
 *
 * Two ideas carry the whole design. The palette is the surface's own: the ANSI
 * roles codsh assigns (magenta for the person, cyan for a tool, red for a
 * failure, a palette gray for everything secondary) are the site's roles too,
 * so a captured frame and the prose around it are coloured by one system. And
 * the rule — the mark codsh draws down a transcript block's left edge to say
 * where a block begins and ends — runs down the sections here for the same
 * reason. Nothing on this page is a screenshot of a mockup: every terminal is
 * a frame the e2e harness captured from the real binary.
 */

:root {
  /* Ground: cool near-black, never #000, with warm ink over it. */
  --bg: #0b0d0f;
  --bg-panel: #101317;
  --bg-raise: #151a1f;
  --ink: #e8e6e1;
  --ink-soft: #b6b8bb;

  /* The surface's own roles, one per ANSI colour it actually paints with. */
  --user: #d98ce8;
  --tool: #6fd6d0;
  --ok: #8fce92;
  --pending: #e6c67c;
  --error: #ea8a8a;
  --path: #8fb4ea;
  --dim: #868b93;

  --rule-heavy: var(--user);
  --rule-light: var(--tool);

  --edge: #21262d;
  --edge-soft: #191d23;

  --measure: 68ch;
  --gutter: clamp(1.25rem, 4vw, 3.5rem);

  /* CJK has no place in a monospace face, so name the fallback rather than
     leaving each platform to pick one. */
  --mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Consolas,
    'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', monospace;
  --display: 'Instrument Serif', 'Iowan Old Style', Georgia, serif;

  --step: 0.28s cubic-bezier(0.2, 0.7, 0.3, 1);
}

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

html {
  scroll-behavior: smooth;
  /* The anchor targets sit below the sticky rail. */
  scroll-padding-top: 5rem;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--mono);
  font-size: 15px;
  line-height: 1.72;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/*
 * Atmosphere: a scanline field and a corner glow, both far below the text.
 *
 * A terminal's ground is not flat, and a flat one reads as a slide. Kept at a
 * few percent so it is texture rather than decoration — legible at any zoom,
 * and invisible once you are reading.
 */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background:
    radial-gradient(1100px 520px at 78% -8%, rgba(111, 214, 208, 0.09), transparent 65%),
    radial-gradient(760px 420px at 8% 4%, rgba(217, 140, 232, 0.07), transparent 60%),
    repeating-linear-gradient(to bottom, rgba(255, 255, 255, 0.016) 0 1px, transparent 1px 3px);
}

main,
header,
footer {
  position: relative;
  z-index: 1;
}

/* ── Type scale ─────────────────────────────────────────────────────────── */

h1,
h2,
h3 {
  font-family: var(--display);
  font-weight: 400;
  letter-spacing: -0.01em;
  line-height: 1.06;
  margin: 0;
}

h1 {
  font-size: clamp(3rem, 9vw, 6.5rem);
}

h2 {
  font-size: clamp(1.9rem, 4.4vw, 3.1rem);
}

h3 {
  font-size: clamp(1.2rem, 2.2vw, 1.5rem);
  line-height: 1.25;
}

p {
  margin: 0 0 1.1em;
  max-width: var(--measure);
  color: var(--ink-soft);
}

strong {
  color: var(--ink);
  font-weight: 700;
}

em {
  font-style: italic;
  font-family: var(--display);
  font-size: 1.08em;
  color: var(--ink);
}

a {
  color: var(--tool);
  text-decoration: none;
  border-bottom: 1px solid color-mix(in oklab, var(--tool) 35%, transparent);
  transition: color var(--step), border-color var(--step);
}

a:hover {
  color: var(--ink);
  border-bottom-color: var(--ink);
}

code {
  font-family: var(--mono);
  font-size: 0.92em;
  color: var(--pending);
  background: color-mix(in oklab, var(--pending) 8%, transparent);
  padding: 0.1em 0.34em;
  border-radius: 3px;
}

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

kbd {
  font-family: var(--mono);
  font-size: 0.82em;
  color: var(--ink);
  border: 1px solid var(--edge);
  border-bottom-width: 2px;
  border-radius: 4px;
  padding: 0.05em 0.4em;
  background: var(--bg-raise);
  white-space: nowrap;
}

/* ── The rail: a language switch and the section index ──────────────────── */

.rail {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding: 0.75rem var(--gutter);
  background: color-mix(in oklab, var(--bg) 82%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--edge-soft);
  font-size: 12.5px;
}

.rail__mark {
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: lowercase;
  color: var(--ink);
  border: 0;
}

.rail__mark::before {
  content: '▍';
  color: var(--user);
  margin-right: 0.45em;
}

.rail nav {
  display: flex;
  gap: 1.1rem;
  margin-left: auto;
  flex-wrap: wrap;
}

.rail nav a {
  color: var(--dim);
  border: 0;
  letter-spacing: 0.02em;
}

.rail nav a:hover {
  color: var(--ink);
}

.rail__lang {
  color: var(--ink);
  border: 1px solid var(--edge);
  border-radius: 999px;
  padding: 0.1em 0.7em;
}

/* ── Layout ─────────────────────────────────────────────────────────────── */

.wrap {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 var(--gutter);
}

section {
  padding: clamp(3.5rem, 9vw, 7rem) 0;
  border-top: 1px solid var(--edge-soft);
}

section:first-of-type {
  border-top: 0;
}

/*
 * A section wears a rule down its left edge, as a transcript block does.
 *
 * The number in the margin is the same device a spec sheet uses: it says where
 * you are without a heading having to.
 */
.block {
  position: relative;
  padding-left: clamp(1.25rem, 3.5vw, 2.75rem);
}

.block::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.3em;
  bottom: 0.2em;
  width: 2px;
  background: linear-gradient(to bottom, var(--rule-light), transparent 92%);
  opacity: 0.55;
}

.block--heavy::before {
  background: linear-gradient(to bottom, var(--rule-heavy), transparent 92%);
  width: 3px;
  opacity: 0.75;
}

.block__index {
  display: block;
  font-size: 11px;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--dim);
  margin-bottom: 1.1rem;
}

.lede {
  font-family: var(--display);
  font-size: clamp(1.3rem, 2.6vw, 1.85rem);
  line-height: 1.42;
  color: var(--ink);
  max-width: 40ch;
}

/* ── Hero ───────────────────────────────────────────────────────────────── */

.hero {
  padding-top: clamp(2.5rem, 7vw, 5rem);
}

/*
 * Claim on the left, the thing itself on the right.
 *
 * The frame is the argument, so it belongs above the fold rather than three
 * sections down. It gives way below the breakpoint, where a 120-column
 * terminal would be a strip of unreadable text.
 */
.hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2.5rem;
  align-items: center;
}

@media (min-width: 62rem) {
  .hero__grid {
    grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
    gap: clamp(2rem, 4vw, 4rem);
  }
}

.hero__frame .frame {
  /* Lifted, as the one object on the page that is not text. */
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.05) inset,
    0 40px 80px -40px rgba(0, 0, 0, 1);
}

.hero__frame .caption {
  margin-top: 0.8rem;
  font-size: 12px;
}

.hero h1 {
  display: flex;
  align-items: baseline;
  gap: 0.1em;
}

.hero h1 .caret {
  color: var(--user);
  font-family: var(--mono);
  font-size: 0.42em;
  transform: translateY(-0.35em);
  animation: blink 1.25s steps(1) infinite;
}

@keyframes blink {
  0%, 45% { opacity: 1; }
  50%, 95% { opacity: 0.18; }
}

.hero__sub {
  margin-top: 1.4rem;
  font-size: clamp(1.05rem, 2vw, 1.3rem);
  line-height: 1.6;
  color: var(--ink);
  max-width: 46ch;
}

.hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.4rem;
  margin: 1.6rem 0 2.2rem;
  font-size: 12.5px;
  color: var(--dim);
  letter-spacing: 0.04em;
}

.hero__meta span::before {
  content: '·';
  margin-right: 0.6em;
  color: var(--edge);
}

.hero__meta span:first-child::before {
  content: none;
}

/* ── Install strip ──────────────────────────────────────────────────────── */

.shell {
  background: var(--bg-panel);
  border: 1px solid var(--edge);
  border-radius: 10px;
  overflow: hidden;
  max-width: var(--measure);
}

.shell__bar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.85rem;
  border-bottom: 1px solid var(--edge-soft);
  font-size: 11px;
  color: var(--dim);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.shell__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--edge);
}

.shell__dot--live {
  background: var(--ok);
  box-shadow: 0 0 0 3px color-mix(in oklab, var(--ok) 18%, transparent);
}

.shell pre {
  margin: 0;
  padding: 1rem 1.1rem;
  overflow-x: auto;
  /* A `pre` keeps the UA's monospace unless told otherwise. */
  font-family: var(--mono);
  font-size: 13.5px;
  line-height: 1.85;
  color: var(--ink);
}

.shell pre .prompt {
  color: var(--ok);
  user-select: none;
}

.shell pre .comment {
  color: var(--dim);
}

.shell pre .cmd {
  color: var(--ink);
}

/* ── The terminal frames ────────────────────────────────────────────────── */

.scenes {
  margin-top: 2.5rem;
}

/*
 * A CSS-only scene switcher.
 *
 * The frames are inlined at build time from the captures, so the showcase has
 * to work with no script at all — the radio inputs are the state, and the
 * labels are the tabs.
 */
.scenes input[type='radio'] {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.scenes__tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 1rem;
}

.scenes__tab {
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--dim);
  padding: 0.3rem 0.7rem;
  border: 1px solid var(--edge-soft);
  border-radius: 999px;
  cursor: pointer;
  transition: color var(--step), border-color var(--step), background var(--step);
  white-space: nowrap;
}

.scenes__tab:hover {
  color: var(--ink);
  border-color: var(--edge);
}

/* Panels are the generator's `data-scene` blocks; only the checked one shows. */
.scenes__panels > div {
  display: none;
}

/* The tab whose radio is checked lights up, and its panel is the one shown. */
#s-1:checked ~ .scenes__tabs [for='s-1'],
#s-2:checked ~ .scenes__tabs [for='s-2'],
#s-3:checked ~ .scenes__tabs [for='s-3'],
#s-4:checked ~ .scenes__tabs [for='s-4'],
#s-5:checked ~ .scenes__tabs [for='s-5'],
#s-6:checked ~ .scenes__tabs [for='s-6'],
#s-7:checked ~ .scenes__tabs [for='s-7'] {
  color: var(--bg);
  background: var(--ink);
  border-color: var(--ink);
}

#s-1:checked ~ .scenes__panels [data-scene='1'],
#s-2:checked ~ .scenes__panels [data-scene='2'],
#s-3:checked ~ .scenes__panels [data-scene='3'],
#s-4:checked ~ .scenes__panels [data-scene='4'],
#s-5:checked ~ .scenes__panels [data-scene='5'],
#s-6:checked ~ .scenes__panels [data-scene='6'],
#s-7:checked ~ .scenes__panels [data-scene='7'] {
  display: block;
}

.frame {
  /* The screen inside sizes itself to this card, not to the viewport. */
  container-type: inline-size;
  background: #090b0d;
  border: 1px solid var(--edge);
  border-radius: 12px;
  overflow: hidden;
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.04) inset,
    0 30px 60px -30px rgba(0, 0, 0, 0.9);
}

.frame__bar {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.5rem 0.8rem;
  border-bottom: 1px solid var(--edge-soft);
  background: linear-gradient(to bottom, #12161a, #0e1215);
}

.frame__bar b {
  margin-left: 0.5rem;
  font-weight: 400;
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--dim);
}

.frame__bar .frame__real {
  margin-left: auto;
  font-size: 10.5px;
  letter-spacing: 0.08em;
  color: var(--ok);
  text-transform: uppercase;
}

.frame__bar .frame__real::before {
  content: '●';
  margin-right: 0.4em;
  font-size: 0.8em;
  vertical-align: 0.1em;
}

/*
 * The screen itself.
 *
 * Rows are pre-wrapped text in a fixed grid, scaled to the card rather than
 * reflowed: a transcript that rewrapped would no longer be the frame that was
 * captured. The row block scrolls sideways on a narrow viewport instead.
 */
.screen {
  overflow-x: auto;
  padding: 0.9rem 0 1rem;
  /*
   * A captured screen is a fixed grid of 84 columns, and reflowing it would
   * make it a different screen. So the type scales to the card instead: at
   * 0.6em per column, 84 of them need just under 51em, and dividing the card
   * by 53 leaves room for the padding. It stops growing at a comfortable
   * reading size and never shrinks past legibility — below that the row block
   * scrolls sideways rather than the page.
   */
  font-size: clamp(7.5px, calc(100cqw / 53), 13px);
  line-height: 1.5;
  scrollbar-width: thin;
}

/*
 * The rows are a `code` element, whose inline styling has no business here:
 * a captured frame carries its own colours, and the tint that marks inline
 * code in prose would wash every one of them.
 */
.screen__rows {
  display: block;
  min-width: max-content;
  padding: 0 0.75em;
  font-family: var(--mono);
  font-size: inherit;
  color: var(--ink);
  background: none;
  border-radius: 0;
}

.screen .row {
  display: block;
  white-space: pre;
  min-height: 1.5em;
}

/* The empty middle of a 40-row screen, shortened but never hidden. */
.screen .gap {
  display: block;
  height: 1.1em;
  margin: 0.15em 0;
  border-left: 0;
  background: repeating-linear-gradient(to bottom, var(--edge-soft) 0 1px, transparent 1px 4px);
  opacity: 0.5;
}

/* Pens, mapped from the SGR the surface actually emitted. */
.screen .c-user { color: var(--user); }
.screen .c-tool { color: var(--tool); }
.screen .c-ok { color: var(--ok); }
.screen .c-pending { color: var(--pending); }
.screen .c-error { color: var(--error); }
.screen .c-path { color: var(--path); }
.screen .c-dim { color: var(--dim); }
.screen .a-bold { font-weight: 700; color: var(--ink); }
.screen .a-dim { color: var(--dim); }
.screen .a-underline { text-decoration: underline; text-underline-offset: 0.18em; }
.screen .a-inverse { background: var(--ink); color: var(--bg); }

.caption {
  margin: 0.9rem 0 0;
  font-size: 13px;
  color: var(--dim);
  max-width: 62ch;
}

.caption b {
  color: var(--ink);
  font-weight: 500;
}

/* ── Feature grid ───────────────────────────────────────────────────────── */

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 20rem), 1fr));
  gap: 1px;
  margin-top: 2.5rem;
  background: var(--edge-soft);
  border: 1px solid var(--edge-soft);
  border-radius: 12px;
  overflow: hidden;
}

.card {
  background: var(--bg);
  padding: 1.6rem 1.5rem;
  position: relative;
  transition: background var(--step);
}

.card:hover {
  background: var(--bg-panel);
}

.card h3 {
  font-family: var(--mono);
  font-size: 13.5px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--ink);
  margin-bottom: 0.6rem;
  padding-left: 0.85rem;
  border-left: 2px solid var(--rule-light);
}

.card--user h3 {
  border-left-color: var(--rule-heavy);
}

.card--flush h3 {
  border-left-color: transparent;
}

.card p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.68;
  max-width: none;
}

.card__keys {
  margin-top: 0.9rem;
  display: flex;
  gap: 0.35rem;
  flex-wrap: wrap;
}

/* ── Steps (the /ship gates) ────────────────────────────────────────────── */

.steps {
  counter-reset: step;
  list-style: none;
  padding: 0;
  margin: 2.5rem 0 0;
  display: grid;
  gap: 1px;
  background: var(--edge-soft);
  border-block: 1px solid var(--edge-soft);
}

.steps li {
  counter-increment: step;
  background: var(--bg);
  padding: 1.3rem 1.5rem 1.3rem 4.2rem;
  position: relative;
}

.steps li::before {
  content: counter(step, decimal-leading-zero);
  position: absolute;
  left: 1.5rem;
  top: 1.35rem;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--dim);
}

.steps li b {
  color: var(--ink);
  font-weight: 700;
}

.steps li .gate {
  color: var(--pending);
  font-weight: 700;
}

.steps li p {
  margin: 0.35rem 0 0;
  font-size: 13.5px;
  max-width: 70ch;
}

/* ── Docs list ──────────────────────────────────────────────────────────── */

.defs {
  margin: 2rem 0 0;
  display: grid;
  gap: 0;
}

.defs > div {
  display: grid;
  grid-template-columns: minmax(9rem, 14rem) 1fr;
  gap: 0 1.5rem;
  padding: 0.85rem 0;
  border-top: 1px solid var(--edge-soft);
  align-items: baseline;
}

.defs > div:last-child {
  border-bottom: 1px solid var(--edge-soft);
}

.defs dt,
.defs > div > :first-child {
  color: var(--tool);
  font-size: 13px;
}

.defs > div > :last-child {
  color: var(--ink-soft);
  font-size: 13.5px;
  margin: 0;
  max-width: 70ch;
}

@media (max-width: 40rem) {
  .defs > div {
    grid-template-columns: 1fr;
    gap: 0.2rem;
  }
}

/* ── Callout ────────────────────────────────────────────────────────────── */

.note {
  margin-top: 2rem;
  padding: 1rem 1.2rem;
  border-left: 3px solid var(--pending);
  background: color-mix(in oklab, var(--pending) 5%, transparent);
  font-size: 13.5px;
  color: var(--ink-soft);
  max-width: var(--measure);
}

.note b {
  color: var(--ink);
}

/* ── Footer ─────────────────────────────────────────────────────────────── */

footer {
  border-top: 1px solid var(--edge-soft);
  padding: 3rem 0 4rem;
  font-size: 12.5px;
  color: var(--dim);
}

footer .wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 2rem;
  align-items: baseline;
}

footer nav {
  display: flex;
  gap: 1.2rem;
  flex-wrap: wrap;
  margin-left: auto;
}

footer a {
  color: var(--ink-soft);
  border: 0;
}

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

/* ── Motion, and the choice to sit still ────────────────────────────────── */

@media (prefers-reduced-motion: no-preference) {
  .reveal {
    animation: rise 0.7s cubic-bezier(0.2, 0.7, 0.3, 1) both;
  }

  .reveal-1 { animation-delay: 0.05s; }
  .reveal-2 { animation-delay: 0.14s; }
  .reveal-3 { animation-delay: 0.23s; }
  .reveal-4 { animation-delay: 0.32s; }

  @keyframes rise {
    from {
      opacity: 0;
      transform: translateY(0.6rem);
    }
    to {
      opacity: 1;
      transform: none;
    }
  }
}

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

  .hero h1 .caret {
    animation: none;
  }
}

/* Light terminals exist; this page is a dark one on purpose, and says so by
   painting its own ground rather than borrowing the browser's. */
@media (prefers-color-scheme: light) {
  :root {
    --bg: #0b0d0f;
  }
}