/* OpenLearn — stylesheet for the presentation site.
 * Deliberate restraint: no remote font, no script, AA contrast. */

:root {
  --bg: #fbfaf7;
  --surface: #ffffff;
  --ink: #171a1f;
  --ink-soft: #4a5058;
  --line: #e3e0d8;
  --accent: #1f5f4f;
  --accent-ink: #ffffff;
  --accent-soft: #e8f1ed;
  --radius: 14px;
  --measure: 68ch;
  --wrap: 1080px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12140f;
    --surface: #1a1d17;
    --ink: #ecece4;
    --ink-soft: #b3b7aa;
    --line: #2c3026;
    --accent: #7fd0b4;
    --accent-ink: #10231c;
    --accent-soft: #1f2a24;
  }
}

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

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 400 1.0625rem/1.65 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

a { color: var(--accent); text-underline-offset: 0.18em; }
a:hover { text-decoration-thickness: 2px; }

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

.wrap {
  width: min(100% - 2.5rem, var(--wrap));
  margin-inline: auto;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--accent);
  color: var(--accent-ink);
  padding: 0.6rem 1rem;
  z-index: 10;
}
.skip-link:focus { left: 0.5rem; top: 0.5rem; }

/* Header ----------------------------------------------------------------- */

.site-header {
  border-bottom: 1px solid var(--line);
  background: var(--surface);
  position: sticky;
  top: 0;
  z-index: 5;
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  min-height: 64px;
  flex-wrap: wrap;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  text-decoration: none;
  color: var(--ink);
}
.brand-mark { color: var(--accent); }

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1rem;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 0.95rem;
}
.nav a {
  text-decoration: none;
  color: var(--ink-soft);
  padding: 0.35rem 0;
  border-bottom: 2px solid transparent;
}
.nav a:hover { color: var(--ink); }
.nav a[aria-current="page"] {
  color: var(--ink);
  border-bottom-color: var(--accent);
}

.header-inner nav { margin-inline-start: auto; }

/* Boutons ---------------------------------------------------------------- */

.btn {
  display: inline-block;
  padding: 0.55rem 1.05rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 600;
}
.btn:hover { border-color: var(--accent); }
.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-ink);
}
.btn-primary:hover { filter: brightness(1.08); }

/* Contenu ---------------------------------------------------------------- */

main { padding: 3rem 0 4rem; }

.hero { padding: 1rem 0 2.5rem; }
.hero h1 {
  font-size: clamp(2rem, 4.5vw, 3.1rem);
  line-height: 1.12;
  letter-spacing: -0.025em;
  margin: 0 0 1rem;
  max-width: 24ch;
}
.hero .lead {
  font-size: clamp(1.05rem, 1.6vw, 1.3rem);
  color: var(--ink-soft);
  max-width: var(--measure);
  margin: 0 0 1.6rem;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 0.75rem; }

h2 {
  font-size: 1.55rem;
  letter-spacing: -0.015em;
  margin: 3rem 0 0.75rem;
}
h3 { font-size: 1.15rem; margin: 1.75rem 0 0.4rem; }

p, ul, ol, blockquote { max-width: var(--measure); }
p { margin: 0 0 1rem; }
li { margin-bottom: 0.4rem; }

.muted { color: var(--ink-soft); }
.small { font-size: 0.9rem; }

.grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  margin: 1.5rem 0;
}

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.25rem 1.35rem;
}
.card h3 { margin-top: 0; }
.card p:last-child { margin-bottom: 0; }

blockquote {
  margin: 1.5rem 0;
  padding: 1rem 1.35rem;
  border-left: 3px solid var(--accent);
  background: var(--accent-soft);
  border-radius: 0 var(--radius) var(--radius) 0;
  font-size: 1.05rem;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.97rem;
}
th, td {
  text-align: left;
  padding: 0.6rem 0.75rem;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}
th { font-weight: 600; }

code {
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.92em;
  background: var(--accent-soft);
  padding: 0.1em 0.35em;
  border-radius: 5px;
}
pre {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1rem 1.15rem;
  overflow-x: auto;
  max-width: 100%;
}
pre code { background: none; padding: 0; }

hr {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 3rem 0;
}

/* Pied de page ----------------------------------------------------------- */

.site-footer {
  border-top: 1px solid var(--line);
  background: var(--surface);
  padding: 2rem 0;
  font-size: 0.94rem;
}
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  justify-content: space-between;
  align-items: flex-start;
}
.footer-brand { font-weight: 600; margin: 0 0 0.35rem; }
.footer-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.35rem;
}

@media (max-width: 720px) {
  .header-inner { gap: 0.75rem; padding-block: 0.75rem; }
  .header-inner nav { order: 3; width: 100%; margin-inline-start: 0; }
  .header-inner .btn { margin-inline-start: auto; }
}

/* Documentation ---------------------------------------------------------- */

.brand-sub {
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-soft);
  border-left: 1px solid var(--line);
  padding-left: 0.6rem;
  margin-left: 0.15rem;
}

.doc-shell {
  display: grid;
  grid-template-columns: minmax(200px, 250px) minmax(0, 1fr);
  gap: 3rem;
  padding: 2.5rem 0 4rem;
  align-items: start;
}

.doc-side {
  position: sticky;
  top: 84px;
  font-size: 0.94rem;
}
.doc-side-title {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
  margin: 0 0 0.5rem;
}
.doc-side-title:not(:first-child) { margin-top: 1.5rem; }
.doc-nav {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.15rem;
  counter-reset: doc;
}
.doc-nav li { margin: 0; }
.doc-nav a {
  display: block;
  padding: 0.35rem 0.6rem;
  border-radius: 8px;
  text-decoration: none;
  color: var(--ink-soft);
  border-left: 2px solid transparent;
}
.doc-nav a:hover { background: var(--accent-soft); color: var(--ink); }
.doc-nav a[aria-current="page"] {
  color: var(--ink);
  background: var(--accent-soft);
  border-left-color: var(--accent);
  font-weight: 600;
}

.doc-main { min-width: 0; }
.doc-main h1 { font-size: clamp(1.7rem, 3vw, 2.3rem); line-height: 1.15; margin: 0 0 0.75rem; }
.doc-main h2 { margin-top: 2.4rem; }
.doc-eyebrow {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--ink-soft);
  margin: 0 0 0.4rem;
}

.doc-pager {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 3.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--line);
  flex-wrap: wrap;
}
.doc-pager a {
  text-decoration: none;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0.7rem 1rem;
  background: var(--surface);
  color: var(--ink);
  max-width: 46%;
}
.doc-pager a:hover { border-color: var(--accent); }
.pager-label {
  display: block;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--ink-soft);
  margin-bottom: 0.15rem;
}
.pager-next { margin-left: auto; text-align: right; }

.steps { counter-reset: step; list-style: none; padding: 0; }
.steps > li {
  position: relative;
  padding-left: 2.4rem;
  margin-bottom: 0.9rem;
}
.steps > li::before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  left: 0;
  top: 0.05rem;
  width: 1.7rem;
  height: 1.7rem;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 700;
  font-size: 0.85rem;
}

.note {
  border-left: 3px solid var(--accent);
  background: var(--accent-soft);
  padding: 0.85rem 1.1rem;
  border-radius: 0 var(--radius) var(--radius) 0;
  margin: 1.25rem 0;
  max-width: var(--measure);
}
.note p:last-child { margin-bottom: 0; }

kbd {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.85em;
  border: 1px solid var(--line);
  border-bottom-width: 2px;
  border-radius: 5px;
  padding: 0.1em 0.35em;
  background: var(--surface);
}

@media (max-width: 900px) {
  .doc-shell { grid-template-columns: minmax(0, 1fr); gap: 1.5rem; }
  .doc-side { position: static; border: 1px solid var(--line); border-radius: var(--radius); padding: 1rem 1.1rem; }
  .doc-pager a { max-width: 100%; }
}