/* =========================================================================
   ALPS PEAKS CONSULTING : feuille de style principale
   Concept : la carte topographique. Courbes de niveau, releves d'altitude,
   filets fins comme des isohypses. Lecture de releve : traits sombres sur
   blanc, accent bleu glacier unique.
   ========================================================================= */

/* ---------- Polices (auto-hebergees, aucun appel tiers) ---------- */
@font-face {
  font-family: 'Inter';
  font-style: normal;
  font-weight: 300 800;
  font-display: swap;
  src: url('../fonts/inter-var.woff2') format('woff2');
}
@font-face {
  font-family: 'JetBrains Mono';
  font-style: normal;
  font-weight: 400 500;
  font-display: swap;
  src: url('../fonts/jetbrains-mono-var.woff2') format('woff2');
}

/* ---------- Jetons ---------- */
:root {
  --ink:        #FFFFFF;   /* fond */
  --ink-2:      #F6F8F9;   /* bandeaux */
  --ink-3:      #EFF3F5;   /* cartouches */
  --snow:       #0D1214;   /* texte principal */
  --mist:       #59646A;   /* texte secondaire */
  --mist-dim:   #8A959B;   /* legendes */
  --glow:       #0E6273;   /* bleu glacier, accent unique */
  --glow-soft:  #12798E;
  --glacier:    #0E6273;

  --hair:       color-mix(in srgb, #2A3438 20%, transparent);
  --hair-soft:  color-mix(in srgb, #2A3438 10%, transparent);

  /* plus de serif auto-hebergee : la piste retenue est entierement sans serif */
  --serif: 'Iowan Old Style', Georgia, serif;
  --sans:  'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --mono:  'JetBrains Mono', ui-monospace, 'SF Mono', Menlo, Consolas, monospace;

  --gutter: clamp(1.25rem, 5vw, 5rem);
  --measure: 62ch;
  --rail: 5.5rem;
  --ease: cubic-bezier(.22, 1, .36, 1);

  /* palette du canvas, lue par topo.js : chaque piste la redefinit */
  --topo-mode: map;
  --topo-line: 70,84,92;       /* isohypses gris anthracite sur blanc */
  --topo-glow: 14,98,115;
  --topo-cool: 14,98,115;
  --topo-crest: 45,58,65;
  --topo-fill-0: #F4F7F8;
  --topo-fill-1: #ECF1F3;
  --topo-fill-2: #E3EAED;
  --topo-fill-3: #D8E1E5;
}

.mark { display: block; flex: none; color: var(--glow); }

/* ---------- Reinitialisation ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--ink);
  color: var(--snow);
  font-family: var(--sans);
  font-size: clamp(1rem, .96rem + .2vw, 1.075rem);
  line-height: 1.65;
  font-weight: 350;
  letter-spacing: -0.006em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

img, canvas, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; }

::selection { background: var(--glow); color: var(--ink); }

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

.skip {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 100;
  padding: .75rem 1.25rem;
  background: var(--glow);
  color: var(--ink);
  font-weight: 600;
}
.skip:focus { left: 1rem; top: 1rem; }

/* ---------- Typographie ---------- */
/* Registre typographique : sans serif technique, composition serree.
   Deux fichiers de police au total, aucune serif auto-hebergee. */
h1, h2, h3 {
  font-family: var(--sans);
  font-weight: 600;
  letter-spacing: -0.035em;
  line-height: 1.04;
  margin: 0;
  text-wrap: balance;
}
h1 { font-size: clamp(2.4rem, 1.3rem + 4.6vw, 4.75rem); }
h2 { font-size: clamp(1.9rem, 1.2rem + 2.8vw, 3.1rem); }
h3 { font-size: clamp(1.15rem, 1.05rem + .5vw, 1.4rem); line-height: 1.12; }

h1 em, h2 em, h3 em { font-style: normal; color: var(--glow); }

p { margin: 0 0 1.1em; max-width: var(--measure); }
p:last-child { margin-bottom: 0; }

.lede {
  font-size: clamp(1.1rem, 1rem + .6vw, 1.45rem);
  line-height: 1.5;
  font-weight: 350;
  letter-spacing: -0.014em;
}
.dim { color: var(--mist); }

/* Etiquette monospace : le langage des legendes de carte */
.tag {
  font-family: var(--mono);
  font-size: .6875rem;
  font-weight: 500;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--mist-dim);
  display: inline-flex;
  align-items: center;
  gap: .6em;
}
.tag::before {
  content: '';
  width: 1.75rem;
  height: 1px;
  background: var(--glow);
  flex: none;
}
.tag--bare::before { display: none; }

/* ---------- Mise en page ---------- */
.shell {
  width: min(100% - (var(--gutter) * 2), 82rem);
  margin-inline: auto;
}

section { position: relative; }

.band {
  padding-block: clamp(5rem, 11vh + 3rem, 10.5rem);
  border-top: 1px solid var(--hair-soft);
}

.band__head {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.75rem;
  margin-bottom: clamp(2.5rem, 6vw, 5rem);
}
@media (min-width: 60rem) {
  .band__head {
    grid-template-columns: 13rem minmax(0, 1fr);
    gap: 3rem;
    align-items: start;
  }
}
.band__head .tag { padding-top: .9rem; }

/* ---------- En-tete ---------- */
.masthead {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 60;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 1.15rem var(--gutter);
  transition: background-color .5s var(--ease), border-color .5s var(--ease);
  border-bottom: 1px solid transparent;
}
.masthead[data-stuck='true'] {
  background: color-mix(in srgb, var(--ink) 90%, transparent);
  backdrop-filter: blur(18px) saturate(140%);
  border-bottom-color: var(--hair-soft);
}

.wordmark {
  display: inline-flex;
  align-items: center;
  gap: .6rem;
  font-family: var(--sans);
  font-weight: 600;
  font-size: 1.1rem;
  letter-spacing: -.03em;
  white-space: nowrap;
}
.wordmark__text {
  display: inline-flex;
  align-items: baseline;
  gap: .55rem;
}
.wordmark__text span {
  font-family: var(--mono);
  font-size: .625rem;
  font-weight: 500;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--mist-dim);
}
@media (max-width: 36rem) { .wordmark__text span { display: none; } }

.nav { display: none; gap: 2rem; align-items: center; }
@media (min-width: 64rem) { .nav { display: flex; } }
.nav a {
  font-size: .82rem;
  font-weight: 450;
  color: var(--mist);
  position: relative;
  padding-block: .35rem;
  transition: color .3s var(--ease);
}
.nav a::after {
  content: '';
  position: absolute;
  left: 0; bottom: 0;
  width: 100%; height: 1px;
  background: var(--glow);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform .45s var(--ease);
}
.nav a:hover { color: var(--snow); }
.nav a:hover::after { transform: scaleX(1); transform-origin: left; }

/* ---------- Boutons ---------- */
.btn {
  --btn-bg: transparent;
  --btn-fg: var(--snow);
  --btn-bd: var(--hair);
  display: inline-flex;
  align-items: center;
  gap: .7rem;
  padding: .85rem 1.5rem;
  border: 1px solid var(--btn-bd);
  background: var(--btn-bg);
  color: var(--btn-fg);
  border-radius: 3px;
  font-size: .8125rem;
  font-weight: 500;
  letter-spacing: .015em;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  isolation: isolate;
  transition: color .4s var(--ease), border-color .4s var(--ease), transform .4s var(--ease);
}
.btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--glow);
  transform: translateY(101%);
  transition: transform .5s var(--ease);
  z-index: -1;
}
.btn:hover { color: var(--ink); border-color: var(--glow); }
.btn:hover::before { transform: translateY(0); }
.btn:active { transform: translateY(1px); }
.btn svg { flex: none; transition: transform .4s var(--ease); }
.btn:hover svg { transform: translateX(3px); }

.btn--solid {
  --btn-bg: var(--glow);
  --btn-fg: var(--ink);
  --btn-bd: var(--glow);
  font-weight: 550;
}
.btn--solid::before { background: var(--snow); }
.btn--solid:hover { color: var(--ink); border-color: var(--snow); }

/* ---------- Heros ---------- */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: flex-end;
  padding-block: 9rem clamp(3rem, 8vh, 5.5rem);
  overflow: hidden;
}
#topo {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  opacity: 0;
  transition: opacity 1.8s ease;
}
#topo[data-ready='true'] { opacity: 1; }
.hero::after {
  content: '';
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background:
    linear-gradient(to top, var(--ink) 2%, color-mix(in srgb, var(--ink) 50%, transparent) 40%, transparent 70%);
}
.hero .shell { position: relative; z-index: 2; }

.hero h1 { margin-block: 1.75rem 2rem; max-width: 15ch; }
.hero .lede { max-width: 44ch; color: var(--mist); }
.hero .lede strong { color: var(--snow); font-weight: 450; }

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .9rem;
  margin-top: 2.5rem;
}

.hero__foot {
  display: grid;
  gap: .6rem;
  margin-top: clamp(3rem, 7vh, 5rem);
  padding-top: 1.5rem;
  border-top: 1px solid var(--hair-soft);
}

/* ---------- Altimetre lateral ---------- */
.altimeter {
  position: fixed;
  left: 0;
  top: 0;
  bottom: 0;
  width: var(--rail);
  z-index: 40;
  display: none;
  pointer-events: none;
  align-items: center;
  justify-content: center;
}
@media (min-width: 80rem) {
  .altimeter {
    display: flex;
    border-right: 1px solid var(--hair-soft);
  }
  /* on reserve la colonne : l'altimetre ne doit jamais chevaucher le texte */
  body { padding-left: var(--rail); }
  .masthead { left: var(--rail); }
}

.altimeter__track {
  position: relative;
  width: 1px;
  height: min(50vh, 26rem);
  background: var(--hair-soft);
}
.altimeter__fill {
  position: absolute;
  inset: 0 0 auto 0;
  height: 0%;
  background: linear-gradient(to bottom, var(--glow-soft), var(--glow));
}
.altimeter__cursor {
  position: absolute;
  left: 50%;
  top: 0;
  translate: -50% -50%;
  display: flex;
  align-items: center;
  gap: .55rem;
}
.altimeter__cursor::before {
  content: '';
  width: .4rem;
  height: .4rem;
  rotate: 45deg;
  background: var(--glow);
  flex: none;
}
.altimeter__value {
  font-family: var(--mono);
  font-size: .625rem;
  font-weight: 500;
  letter-spacing: .06em;
  color: var(--glow);
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}
.altimeter__label {
  position: absolute;
  bottom: -2.5rem;
  left: 50%;
  translate: -50%;
  font-family: var(--mono);
  font-size: .5625rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--mist-dim);
  white-space: nowrap;
}

/* ---------- Revelations au defilement ---------- */
.rise {
  opacity: 0;
  transform: translateY(1.75rem);
  transition: opacity .9s var(--ease), transform .9s var(--ease);
  transition-delay: var(--delay, 0ms);
}
.rise.is-in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .rise { opacity: 1; transform: none; transition: none; }
  #topo { opacity: 1; }
}