/*
 * One stylesheet for both languages. Tokens on :root, redefined once under
 * prefers-color-scheme, so nothing else in the file mentions a colour twice.
 * System fonts only: the page makes no external request at all, which is a
 * claim printed in the footer and therefore worth keeping true.
 *
 * The page is laid out as a case file: a hairline margin rule runs down the
 * left of every section the way it would in a lab notebook, each heading sits
 * on it as a small square, and the one piece of colour is the seal red used
 * for the report card, links and focus. Body text is set in the system serif
 * because the page is read, not scanned; headings are the system sans, tight.
 */

:root {
  color-scheme: light dark;

  --paper: #edf0ec;
  --surface: #ffffff;
  --ink: #0d2a24;
  --muted: #4c6660;
  --rule: #d3dcd6;
  --rule-soft: #e2e9e4;
  --accent: #a8102b;
  --accent-ink: #ffffff;
  --accent-wash: #f7e7ea;
  --slab: #0d2a24;
  --slab-ink: #d7e5df;
  --slab-rule: #21473f;
  --slab-key: #86c9b4;
  --slab-warn: #ff9f8d;

  --radius: 4px;
  --radius-lg: 8px;
  --sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, "Times New Roman", serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #071a16;
    --surface: #0c2620;
    --ink: #e3ece8;
    --muted: #9ab3ab;
    --rule: #1e3b34;
    --rule-soft: #14302a;
    --accent: #ff8898;
    --accent-ink: #14100f;
    --accent-wash: #23201f;
    --slab: #041310;
    --slab-ink: #cfe0da;
    --slab-rule: #1a3b34;
    --slab-key: #6fbfa8;
    --slab-warn: #ff9f8d;
  }
}

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 1.0625rem/1.7 var(--serif);
  font-synthesis-weight: none;
}

.wrap {
  width: min(72rem, 100%);
  margin: 0 auto;
  padding: 0 clamp(1.25rem, 5vw, 3rem);
}

a {
  color: var(--accent);
  text-underline-offset: 0.15em;
  text-decoration-thickness: 1px;
}

a:hover {
  text-decoration-thickness: 2px;
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 2px;
}

h1,
h2,
h3,
.sans {
  font-family: var(--sans);
  font-weight: 650;
  letter-spacing: -0.022em;
}

h1 {
  font-size: clamp(2.1rem, 1.2rem + 3.2vw, 3.4rem);
  line-height: 1.06;
  margin: 0 0 1.25rem;
  max-width: 17ch;
}

h2 {
  font-size: clamp(1.45rem, 1.2rem + 0.9vw, 1.9rem);
  line-height: 1.15;
  margin: 0 0 1.25rem;
  position: relative;
}

h3 {
  font-size: 1.0625rem;
  letter-spacing: -0.01em;
  margin: 0 0 0.35rem;
}

p {
  margin: 0 0 1.05rem;
  max-width: 34rem;
}

.lede {
  font-family: var(--sans);
  font-weight: 450;
  font-size: clamp(1.1rem, 1rem + 0.5vw, 1.3rem);
  line-height: 1.4;
  letter-spacing: -0.01em;
  color: var(--muted);
  max-width: 28rem;
}

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

.small {
  font-size: 0.9375rem;
}

/* ---------------------------------------------------------------- header */

.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--rule);
}

.site-header .wrap {
  display: flex;
  align-items: center;
  gap: 1rem;
  min-height: 4rem;
  flex-wrap: wrap;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--sans);
  font-weight: 650;
  letter-spacing: -0.03em;
  font-size: 1.0625rem;
  color: var(--ink);
  text-decoration: none;
}

.brand svg {
  width: 20px;
  height: 26px;
  flex: none;
  color: var(--accent);
}

.site-header nav {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 1.25rem;
  font-family: var(--sans);
  font-size: 0.9375rem;
}

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

.site-header nav a:hover {
  color: var(--ink);
  text-decoration: underline;
}

.lang {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding-left: 1.25rem;
  border-left: 1px solid var(--rule);
}

.site-header .lang a[aria-current="true"] {
  color: var(--ink);
  font-weight: 650;
}

.lang span {
  color: var(--rule);
}

/* -------------------------------------------------------------- sections */

main > section {
  padding: clamp(3rem, 7vw, 5.5rem) 0;
  border-top: 1px solid var(--rule);
}

main > section:first-child {
  border-top: 0;
}

/* The notebook margin: a hairline down the section with the heading sitting
   on it as a small square. Desktop only — on a phone the rule would crowd the
   text without adding anything. */
@media (min-width: 62rem) {
  .rail {
    border-left: 1px solid var(--rule);
    padding-left: 2.75rem;
  }

  .rail > h2::before {
    content: "";
    position: absolute;
    left: calc(-2.75rem - 4px);
    top: 0.5em;
    width: 8px;
    height: 8px;
    background: var(--accent);
  }
}

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

.hero {
  background: var(--surface);
  padding-bottom: clamp(3rem, 7vw, 5rem);
}

.hero-grid {
  display: grid;
  gap: clamp(2.5rem, 5vw, 4rem);
  align-items: start;
}

@media (min-width: 62rem) {
  .hero-grid {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
    gap: 4.5rem;
  }
}

.hero p {
  max-width: 33rem;
}

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

.button {
  display: inline-block;
  font-family: var(--sans);
  font-weight: 550;
  font-size: 0.9375rem;
  letter-spacing: -0.005em;
  padding: 0.65rem 1.15rem;
  border-radius: var(--radius);
  border: 1px solid var(--rule);
  text-decoration: none;
  color: var(--ink);
  background: transparent;
  transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

.button:hover {
  border-color: var(--ink);
  background: var(--paper);
}

.button.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-ink);
}

.button.primary:hover {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--surface);
}

button.button {
  font: inherit;
  font-family: var(--sans);
  font-weight: 550;
  font-size: 0.9375rem;
  cursor: pointer;
}

/* ----------------------------------------------------------- report card */

/* The stylised report the library would have posted. It assembles itself once
   on load: the rows arrive in the order the library collects them, and the
   status seals it. Nothing here is interactive, so it is aria-hidden and the
   same facts are in the prose beside it. */

.card {
  margin: 0;
  background: var(--slab);
  color: var(--slab-ink);
  border: 1px solid var(--slab-rule);
  border-radius: var(--radius-lg);
  font-family: var(--mono);
  font-size: 0.875rem;
  line-height: 1.55;
  overflow: hidden;
  box-shadow: 0 18px 40px -28px rgb(13 42 36 / 55%);
}

.card-head {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.7rem 1rem;
  border-bottom: 1px solid var(--slab-rule);
  color: var(--slab-key);
}

.card-head b {
  font-weight: 400;
  color: var(--slab-ink);
}

.card-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  flex: none;
}

.card-head .grow {
  margin-left: auto;
  opacity: 0.65;
}

.card-body {
  padding: 0.35rem 1rem 0.9rem;
}

.card-row {
  display: grid;
  grid-template-columns: 4.75rem minmax(0, 1fr);
  gap: 0.75rem;
  padding: 0.6rem 0;
  border-bottom: 1px solid var(--slab-rule);
}

.card-row:last-child {
  border-bottom: 0;
}

.card-row .k {
  color: var(--slab-key);
}

.card-row .v {
  overflow-wrap: anywhere;
}

.card-quote {
  font-family: var(--serif);
  font-size: 1.0625rem;
  line-height: 1.45;
  color: #ffffff;
}

.card-warn {
  color: var(--slab-warn);
}

.chip {
  display: inline-block;
  border: 1px solid var(--slab-rule);
  border-radius: 3px;
  padding: 0 0.35rem;
  margin: 0 0.3rem 0.25rem 0;
}

.card-foot {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.7rem 1rem;
  border-top: 1px solid var(--slab-rule);
  background: rgb(255 255 255 / 3%);
}

.card-foot .seal {
  margin-left: auto;
  background: var(--accent);
  color: var(--accent-ink);
  border-radius: 3px;
  padding: 0.05rem 0.45rem;
  font-weight: 700;
}

/* The single orchestrated moment on the page. */
.card-row,
.card-foot {
  animation: bb-rise 0.5s cubic-bezier(0.2, 0.7, 0.3, 1) both;
  animation-delay: calc(160ms + var(--i, 0) * 110ms);
}

.card-foot .seal {
  animation: bb-seal 0.35s cubic-bezier(0.2, 1.4, 0.4, 1) both;
  animation-delay: calc(160ms + var(--i, 0) * 110ms + 180ms);
}

@keyframes bb-rise {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
}

@keyframes bb-seal {
  from {
    opacity: 0;
    transform: scale(1.35);
  }
}

.card-note {
  margin: 0.75rem 0 0;
  font-size: 0.875rem;
  color: var(--muted);
  max-width: none;
}

/* ------------------------------------------------------------------ list */

.terms {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}

@media (min-width: 48rem) {
  .terms {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 3rem;
  }
}

.terms li {
  padding: 1.15rem 0;
  border-top: 1px solid var(--rule-soft);
  max-width: 34rem;
}

.terms p {
  margin: 0;
  color: var(--muted);
  font-size: 0.9875rem;
}

/* --------------------------------------------------------- code and slab */

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

.slab {
  background: var(--slab);
  border: 1px solid var(--slab-rule);
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin: 0 0 1rem;
}

.slab-tab {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--slab-key);
  padding: 0.5rem 1rem;
  border-bottom: 1px solid var(--slab-rule);
}

.slab pre {
  margin: 0;
  padding: 0.9rem 1rem 1rem;
  overflow-x: auto;
  color: var(--slab-ink);
  font-size: 0.8125rem;
  line-height: 1.6;
}

p code,
li code {
  background: var(--rule-soft);
  border-radius: 3px;
  padding: 0.08em 0.32em;
  font-size: 0.875em;
}

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

/* Three ways in, as three rows rather than three columns: a snippet needs the
   width of a line of code, and cutting one in half to fit a card helps nobody. */

.options {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.25rem;
  margin: 1.75rem 0 1.5rem;
}

.option {
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: var(--radius-lg);
  padding: 1.35rem 1.5rem;
  display: grid;
  /* minmax(0, …) so a long line of code scrolls inside its own slab instead of
     widening the page. */
  grid-template-columns: minmax(0, 1fr);
  gap: 1.25rem;
}

.option-code,
.option-text,
.slab {
  min-width: 0;
}

@media (min-width: 56rem) {
  .option {
    grid-template-columns: minmax(0, 17rem) minmax(0, 1fr);
    gap: 2.5rem;
    align-items: start;
  }
}

.option > div > p,
.option-text p {
  color: var(--muted);
  font-size: 0.9375rem;
  max-width: 30rem;
}

.option-text p:last-child {
  margin-bottom: 0;
}

.option-code .slab:last-child {
  margin-bottom: 0;
}

.option-soon {
  background: transparent;
  border-style: dashed;
}

.option-soon h3 {
  color: var(--muted);
}

.later {
  font-family: var(--mono);
  font-size: 0.75rem;
  font-weight: 400;
  letter-spacing: 0;
  color: var(--accent);
  border: 1px solid currentColor;
  border-radius: 3px;
  padding: 0 0.35rem;
  margin-left: 0.4rem;
  vertical-align: 0.15em;
}

/* ------------------------------------------------------------------ demo */

.demo-grid {
  display: grid;
  gap: 2rem;
}

@media (min-width: 62rem) {
  .demo-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 3rem;
    align-items: start;
  }
}

#payload {
  min-height: 9rem;
  white-space: pre-wrap;
  word-break: break-word;
}

#payload:empty::before {
  content: attr(data-empty);
  color: var(--slab-key);
  font-family: var(--sans);
  font-size: 0.875rem;
}

/* When the panel is open the demo says so, quietly. */
#demo {
  transition: background-color 0.3s ease;
}

.panel-open #demo {
  background: var(--surface);
}

.panel-open #demo .rail {
  border-left-color: var(--accent);
}

/* --------------------------------------------------------------- privacy */

#privacy .rail {
  border-left-color: var(--accent);
}

#privacy ol {
  padding-left: 1.3rem;
  max-width: 34rem;
}

#privacy li {
  margin-bottom: 0.7rem;
}

#privacy li::marker {
  font-family: var(--mono);
  font-size: 0.8125rem;
  color: var(--accent);
}

/* ---------------------------------------------------------------- mahope */

#mahope {
  background: var(--surface);
}

.signature {
  font-family: var(--sans);
  font-size: 0.9375rem;
  margin-top: 1.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
  align-items: baseline;
}

.signature strong {
  font-weight: 650;
}

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

footer {
  padding: 2.5rem 0 3.5rem;
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.9375rem;
  border-top: 1px solid var(--rule);
}

footer p {
  max-width: 40rem;
  margin: 0 0 0.6rem;
}

footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.5rem;
  margin-bottom: 1rem;
}

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

/* ---------------------------------------------------------- scroll reveal */

/* The class is set by demo.js, so a page without JavaScript never hides
   anything. Reduced motion opts out entirely. */
.reveal-ready .reveal {
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 0.5s ease, transform 0.5s cubic-bezier(0.2, 0.7, 0.3, 1);
}

.reveal-ready .reveal.seen {
  opacity: 1;
  transform: none;
}

@media print {
  .reveal-ready .reveal {
    opacity: 1;
    transform: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }

  .reveal-ready .reveal {
    opacity: 1;
    transform: none;
  }
}