/* btcaux: terminal-docs field manual. One stylesheet for every page. */

:root {
  /* The whole palette: six colors, all built around hue 328. */
  --c-bg: #fbf4f8;
  --c-ink: #2e1422;
  --c-plum: #7c1d50;
  --c-rose: #d14791;
  --c-mist: #f2dee9;
  --c-night: #3d1a2d;

  --font-humanist: "Gill Sans", Optima, "Segoe UI", sans-serif;
  --gutter: 16px;
  --wrap: 72rem;
  --measure: 66ch;
  --radius: 3px;
  color-scheme: light;
}

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

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

@media (prefers-reduced-motion: no-preference) {
  html {
    scroll-behavior: smooth;
  }
}

body {
  margin: 0;
  min-width: 0;
  background-color: var(--c-bg);
  color: var(--c-ink);
  font-family: var(--font-humanist);
  font-size: clamp(1rem, 0.95rem + 0.25vw, 1.1875rem);
  line-height: 1.6;
  overflow-wrap: break-word;
}

h1,
h2,
p,
ul,
ol,
dl,
dd,
pre {
  margin: 0;
}

h1,
h2,
dt {
  font-weight: 700;
}

img,
svg,
canvas {
  max-width: 100%;
}

a {
  color: var(--c-plum);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

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

a:focus-visible,
button:focus-visible,
input:focus-visible {
  outline: 3px solid var(--c-rose);
  outline-offset: 3px;
}

main:focus {
  outline: none;
}

[id] {
  scroll-margin-top: 6rem;
}

output {
  font-weight: 700;
}

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

/* Skip link */
.skip-link {
  position: absolute;
  left: var(--gutter);
  top: -4rem;
  z-index: 100;
  padding: 0.5rem 0.9rem;
  background-color: var(--c-plum);
  color: var(--c-bg);
  font-weight: 700;
  text-decoration: none;
}

.skip-link:hover {
  color: var(--c-bg);
}

.skip-link:focus {
  top: 0.5rem;
  outline: 3px solid var(--c-rose);
  outline-offset: 2px;
}

/* Sticky command bar */
.cmdbar {
  position: sticky;
  top: 0;
  z-index: 50;
  background-color: var(--c-night);
  color: var(--c-bg);
  border-bottom: 3px solid var(--c-rose);
}

.cmdbar-inner {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0.75rem var(--gutter);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem 1.25rem;
}

.cmdbar-brand {
  font-size: 1.05rem;
  font-weight: 700;
  white-space: nowrap;
}

.cmdbar a,
.cmdbar a:hover {
  color: var(--c-bg);
  text-decoration: none;
}

.cmdbar .prompt {
  color: var(--c-bg);
}

.cmdbar-nav ul {
  list-style: none;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.2rem 1.1rem;
}

.cmdbar-nav a {
  display: inline-block;
  padding: 0.15rem 0;
  border-bottom: 2px solid var(--c-night);
}

.cmdbar-nav a:hover {
  border-bottom-color: var(--c-rose);
}

.cmdbar-nav a[aria-current="page"] {
  border-bottom-color: var(--c-rose);
  font-weight: 700;
}

/* Prompt-style typography */
.prompt {
  color: var(--c-plum);
  font-weight: 700;
}

.eyebrow {
  margin-bottom: 0.9rem;
  color: var(--c-plum);
  font-size: 0.95rem;
  letter-spacing: 0.02em;
}

.caret {
  display: inline-block;
  width: 0.55em;
  height: 1em;
  margin-left: 0.2em;
  vertical-align: -0.12em;
  background-color: var(--c-rose);
  animation: blink 1.1s steps(1, end) infinite;
}

@keyframes blink {
  50% {
    opacity: 0;
  }
}

h1 {
  margin-bottom: 1rem;
  color: var(--c-plum);
  font-size: clamp(2rem, 1.2rem + 3.4vw, 3.3rem);
  line-height: 1.12;
  letter-spacing: -0.01em;
}

.lede {
  max-width: var(--measure);
  font-size: clamp(1.1rem, 1rem + 0.5vw, 1.35rem);
  line-height: 1.5;
}

.prompt-heading {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  column-gap: 0.45em;
  color: var(--c-plum);
  font-size: clamp(1.3rem, 1.1rem + 0.9vw, 1.75rem);
  line-height: 1.25;
}

/* Page head */
.page-head {
  padding: clamp(2.25rem, 5vw, 4.5rem) 0 clamp(1.75rem, 3.5vw, 2.75rem);
  border-bottom: 2px solid var(--c-plum);
}

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

@media (min-width: 60rem) {
  .hero {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 3rem;
  }
}

.hero-actions {
  margin-top: 1.75rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

/* Man-page style blocks: index column on wide screens, body beside it */
.block {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.1rem;
  padding: clamp(2.25rem, 4.5vw, 3.5rem) 0;
  border-bottom: 1px solid var(--c-plum);
}

.block-index {
  color: var(--c-plum);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.14em;
}

.flow > * + * {
  margin-top: 1rem;
}

.flow p {
  max-width: var(--measure);
}

.flow ul,
.flow ol {
  max-width: var(--measure);
  padding-left: 1.25rem;
}

.flow li + li {
  margin-top: 0.45rem;
}

@media (min-width: 52rem) {
  .block {
    grid-template-columns: 8rem minmax(0, 1fr);
    gap: 2.5rem;
  }

  .block-index {
    padding-top: 0.45rem;
  }
}

.rules {
  list-style: none;
  padding: 0 !important;
}

.rules > li {
  padding: 0.85rem 0;
  border-top: 1px dashed var(--c-plum);
}

.rules > li:first-child {
  border-top: none;
  padding-top: 0.2rem;
}

.checklist {
  list-style: none;
  padding: 0 !important;
}

.checklist > li {
  position: relative;
  padding-left: 2rem;
}

.checklist > li + li {
  margin-top: 0.6rem;
}

.checklist > li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.4em;
  width: 0.95rem;
  height: 0.95rem;
  border: 2px solid var(--c-plum);
  border-radius: 1px;
  background-color: var(--c-bg);
}

.readout {
  max-width: var(--measure);
  padding: 1rem 1.15rem;
  background-color: var(--c-mist);
  border-left: 4px solid var(--c-plum);
  font-family: var(--font-humanist);
  font-size: 0.97rem;
  line-height: 1.7;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.note {
  max-width: var(--measure);
  padding: 0.9rem 1.1rem;
  border: 2px solid var(--c-plum);
  background-color: var(--c-mist);
}

.status {
  max-width: var(--measure);
  padding: 0.8rem 1rem;
  border-left: 4px solid var(--c-rose);
  background-color: var(--c-mist);
  color: var(--c-ink);
}

/* Buttons */
.btn {
  appearance: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0.6rem 1.15rem;
  border: 2px solid var(--c-plum);
  border-radius: var(--radius);
  background-color: var(--c-plum);
  color: var(--c-bg);
  font: inherit;
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.2;
  text-align: center;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 160ms ease, color 160ms ease, border-color 160ms ease;
}

.btn,
.btn:hover,
.btn:visited {
  color: var(--c-bg);
}

.btn:hover {
  background-color: var(--c-ink);
  border-color: var(--c-ink);
}

.btn--ghost,
.btn--ghost:hover,
.btn--ghost:visited {
  background-color: var(--c-bg);
  color: var(--c-plum);
}

.btn--ghost:hover {
  background-color: var(--c-mist);
  border-color: var(--c-ink);
  color: var(--c-ink);
}

/* Physics demo controls */
.settle-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: 1rem 1.5rem;
}

.control-gravity {
  display: grid;
  gap: 0.4rem;
  flex: 1 1 16rem;
}

.control-gravity label {
  font-weight: 700;
}

input[type="range"] {
  width: 100%;
  min-height: 44px;
  margin: 0;
  accent-color: var(--c-plum);
}

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.settle-canvas {
  display: block;
  width: 100%;
  height: clamp(260px, 42vw, 400px);
  border: 2px solid var(--c-ink);
  border-radius: var(--radius);
  background-color: var(--c-mist);
}

.count {
  font-weight: 700;
}

.nojs-note {
  display: none;
}

.no-js .nojs-note {
  display: block;
}

.no-js .js-only {
  display: none !important;
}

/* Diagrams (inline SVG) */
.diagram {
  display: block;
  width: 100%;
  height: auto;
}

.diagram .frame {
  fill: var(--c-mist);
  stroke: var(--c-ink);
  stroke-width: 2;
}

.diagram .route {
  fill: none;
  stroke: var(--c-plum);
  stroke-width: 3;
  stroke-dasharray: 9 7;
  animation: march 1.6s linear infinite;
}

.diagram .node {
  fill: var(--c-rose);
  stroke: var(--c-ink);
  stroke-width: 2;
}

.diagram text {
  fill: var(--c-ink);
  font-family: var(--font-humanist);
  font-size: 19px;
  font-weight: 700;
}

.diagram .small {
  font-size: 14px;
  font-weight: 400;
}

.diagram .label {
  font-size: 16px;
}

@keyframes march {
  to {
    stroke-dashoffset: -32;
  }
}

/* Glossary */
.term-index {
  list-style: none;
  padding: 0 !important;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 0.6rem;
}

.term-index a {
  display: inline-block;
  padding: 0.25rem 0.6rem;
  border: 1px solid var(--c-plum);
  border-radius: var(--radius);
  font-size: 0.95rem;
  text-decoration: none;
}

.term-index a:hover {
  background-color: var(--c-mist);
  color: var(--c-ink);
}

.glossary dt {
  margin-top: 1.4rem;
  color: var(--c-plum);
  font-size: 1.15rem;
}

.glossary dt:first-child {
  margin-top: 0;
}

.glossary dd {
  max-width: var(--measure);
  margin-top: 0.3rem;
  padding-left: 1rem;
  border-left: 2px solid var(--c-rose);
}

/* Footer */
.site-foot {
  margin-top: clamp(2.5rem, 6vw, 4.5rem);
  padding: 2rem 0 2.75rem;
  border-top: 3px solid var(--c-plum);
  background-color: var(--c-bg);
}

.foot-note {
  max-width: var(--measure);
  margin-bottom: 0.75rem;
  font-size: 0.95rem;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .diagram .route,
  .caret {
    animation: none !important;
  }
}