/* Tuvaraneso — feuille de style commune */

:root {
  --bg: #e8e6e1;
  --bg-alt: #d3d0c9;
  --bg-dark: #2a2a28;
  --ink: #17171a;
  --ink-soft: #6a6862;
  --ink-invert: #e8e6e1;
  --rust: #8c4a2f;
  --steel: #55707a;
  --col-gap: 26px;
  --maxw: 1160px;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: system-ui, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 17px;
  line-height: 1.7;
  overflow-x: hidden;
}

.wrap {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--col-gap);
}

/* ---------- liens ---------- */

a {
  color: var(--rust);
  text-decoration: none;
  border-bottom: 1px solid rgba(140, 74, 47, .45);
}

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

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

.band--dark a { color: #d99f83; border-bottom-color: rgba(217, 159, 131, .5); }
.band--dark a:focus-visible { outline-color: #d99f83; }

/* ---------- en-tête et navigation ---------- */

.site-head {
  border-bottom: 1px solid rgba(23, 23, 26, .14);
  padding: 22px 0 20px;
}

.brand {
  display: block;
  text-align: center;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--ink);
  border: 0;
}

.brand:hover { color: var(--rust); }

.brand-note {
  display: block;
  text-align: center;
  margin-top: 6px;
  font-size: 13px;
  color: var(--steel);
  letter-spacing: .04em;
}

.nav {
  margin-top: 18px;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 6px 0;
}

.nav a {
  display: inline-block;
  padding: 4px 16px;
  font-size: 14.5px;
  letter-spacing: .03em;
  color: var(--ink);
  border-bottom: 0;
  border-right: 1px solid rgba(85, 112, 122, .5);
}

.nav a:last-child { border-right: 0; }
.nav a:hover { color: var(--rust); }
.nav a[aria-current="page"] { color: var(--rust); font-weight: 600; }

/* ---------- rythme des sections ---------- */

.band { padding: 64px 0; }
.band--wide { padding: 80px 0; }
.band--tall { padding: 96px 0; }
.band--alt { background: var(--bg-alt); }

.band--dark {
  background: var(--bg-dark);
  color: var(--ink-invert);
  padding: 96px 0;
}

.band--dark h2 { color: var(--ink-invert); }
.band--dark .num { color: #8fa8b0; }
.band--dark .caption { color: #a9a69e; }

/* ---------- axe et héros ---------- */

.hero {
  position: relative;
  padding: 76px 0 64px;
  text-align: center;
}

.hero::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 1px;
  background: linear-gradient(to bottom, rgba(140, 74, 47, 0), var(--rust) 18%, var(--rust) 82%, rgba(140, 74, 47, 0));
}

.hero .wrap { position: relative; }

.eyebrow {
  font-size: 13px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--steel);
  margin: 0 0 22px;
}

h1 {
  font-size: clamp(34px, 6.2vw, 62px);
  line-height: 1.06;
  letter-spacing: -0.035em;
  font-weight: 700;
  margin: 0 auto 26px;
  max-width: 15ch;
  text-wrap: balance;
}

.lede {
  grid-column: 4 / 10;
  font-size: 18.5px;
  color: var(--ink);
  margin: 0;
}

.hero-sides { margin-top: 44px; }

.hero-sides .side {
  font-size: 15px;
  line-height: 1.65;
  color: var(--ink-soft);
  text-align: left;
}

.hero-sides .side:first-child { grid-column: 2 / 5; }
.hero-sides .side:last-child { grid-column: 9 / 12; }

.side strong {
  display: block;
  color: var(--ink);
  font-size: 13px;
  letter-spacing: .14em;
  text-transform: uppercase;
  margin-bottom: 8px;
}

/* ---------- titres ---------- */

h2 {
  font-size: clamp(23px, 2.7vw, 31px);
  line-height: 1.2;
  letter-spacing: -0.018em;
  font-weight: 600;
  margin: 0 0 20px;
}

h3 {
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -0.005em;
  margin: 30px 0 10px;
}

.num {
  display: block;
  font-size: 13px;
  letter-spacing: .18em;
  color: var(--steel);
  margin-bottom: 10px;
}

p { margin: 0 0 18px; }
p:last-child { margin-bottom: 0; }

.caption {
  font-size: 13px;
  line-height: 1.6;
  color: var(--ink-soft);
}

/* ---------- compositions de colonnes ---------- */

.centered { text-align: center; }

.col-center { grid-column: 4 / 10; }
.col-left7 { grid-column: 1 / 8; }
.col-right7 { grid-column: 6 / 13; }

.pair > * { }
.pair .cell:first-child { grid-column: 2 / 6; }
.pair .cell:last-child { grid-column: 8 / 12; }

.dark-split .cell-a { grid-column: 2 / 6; }
.dark-split .cell-b { grid-column: 7 / 12; }

.head-block { margin-bottom: 34px; }

/* ---------- listes ---------- */

ul, ol { margin: 0 0 18px; padding-left: 20px; }
li { margin-bottom: 9px; }
li::marker { color: var(--rust); }

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

.checklist li {
  position: relative;
  padding-left: 26px;
  border-bottom: 1px solid rgba(23, 23, 26, .1);
  padding-bottom: 9px;
}

.checklist li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .72em;
  width: 12px;
  height: 1px;
  background: var(--rust);
}

.band--dark .checklist li { border-bottom-color: rgba(232, 230, 225, .18); }

/* ---------- séparateur en arc ---------- */

.arc {
  width: 33%;
  max-width: 340px;
  height: 46px;
  margin: 0 auto;
  border-top: 1px solid var(--steel);
  border-left: 1px solid rgba(85, 112, 122, .35);
  border-right: 1px solid rgba(85, 112, 122, .35);
  border-radius: 200px 200px 0 0;
}

.arc--rust { border-top-color: var(--rust); }
.arc--light { border-top-color: rgba(232, 230, 225, .8); border-left-color: rgba(232, 230, 225, .3); border-right-color: rgba(232, 230, 225, .3); }

/* ---------- encadré de définition ---------- */

.note {
  border-top: 2px solid var(--rust);
  padding-top: 16px;
  font-size: 15.5px;
  color: var(--ink-soft);
}

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

/* ---------- contact ---------- */

.contact-line {
  font-size: 19px;
  margin-top: 8px;
}

/* ---------- pied de page ---------- */

.site-foot {
  padding: 56px 0 60px;
  background: var(--bg-alt);
  text-align: center;
}

.site-foot .arc { margin-bottom: 34px; }

.foot-name {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .22em;
  text-transform: uppercase;
  margin: 0 0 16px;
}

.foot-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 4px 0;
  margin-bottom: 18px;
}

.foot-nav a {
  padding: 2px 14px;
  font-size: 14px;
  color: var(--ink);
  border-bottom: 0;
  border-right: 1px solid rgba(85, 112, 122, .5);
}

.foot-nav a:last-child { border-right: 0; }
.foot-nav a:hover { color: var(--rust); }

.foot-mail { margin: 0 0 14px; font-size: 16px; }

.foot-note {
  max-width: 56ch;
  margin: 0 auto;
  font-size: 13px;
  line-height: 1.65;
  color: var(--ink-soft);
}

/* ---------- responsive ---------- */

@media (max-width: 900px) {
  body { font-size: 16.5px; }

  .grid { grid-template-columns: 1fr; gap: 26px; }

  .lede,
  .col-center,
  .col-left7,
  .col-right7,
  .hero-sides .side:first-child,
  .hero-sides .side:last-child,
  .pair .cell:first-child,
  .pair .cell:last-child,
  .dark-split .cell-a,
  .dark-split .cell-b { grid-column: 1 / -1; }

  .hero { padding: 48px 0 44px; }
  .hero::before { display: none; }

  .band, .band--wide, .band--tall, .band--dark { padding: 44px 0; }
  .band--dark { padding: 52px 0; }

  .hero-sides { margin-top: 32px; }
  .hero-sides .side { text-align: left; }

  .arc { width: 62%; height: 36px; }

  .nav a { padding: 4px 12px; font-size: 14px; }

  .site-foot { padding: 44px 0 48px; }
}

@media (max-width: 520px) {
  .wrap { padding: 0 18px; }
  h1 { max-width: none; }
  .nav a { border-right: 0; padding: 3px 10px; }
  .foot-nav a { border-right: 0; padding: 3px 10px; }
}