/* Une vie en scroll — feuille de style
   Direction : fond sombre et chaud, une seule couleur de vie (corail) qui gagne du
   terrain, typographie grande et rare, chiffres tabulaires. Mobile d'abord,
   mise en page laptop à partir de 1024 px. */

:root {
  --bg: #0e0b09;
  --bg-2: #171210;
  --ink: #f1e8dc;
  --ink-2: #a89b8f;
  --ink-3: #5e554e;
  --life: #ff6a45;
  --life-soft: rgba(255, 106, 69, 0.18);
  --grid-empty: rgba(241, 232, 220, 0.06);
  --grid-full: rgba(255, 106, 69, 0.85);
  --gutter: 16px;
  --measure: 36rem;
  --serif: "Fraunces", "Iowan Old Style", Georgia, serif;
  --sans: "Instrument Sans", "Helvetica Neue", Arial, sans-serif;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

@media (prefers-color-scheme: light) {
  :root { color-scheme: dark; }
}

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

html {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 106.25%;
  line-height: 1.5;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  overflow-x: hidden;
}

body {
  margin: 0;
  min-height: 100svh;
  background: var(--bg);
  overflow-x: hidden;
  overflow-wrap: anywhere;
}

/* La grille — fil rouge — tapisse l'arrière-plan de toute la page. */
#grid-bg {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

.skip {
  position: absolute;
  left: -200vw;
  top: 0.5rem;
  z-index: 50;
  padding: 0.5rem 0.75rem;
  background: var(--ink);
  color: var(--bg);
}
.skip:focus { left: 0.5rem; }

/* ---------- Barre haute ---------- */
.topbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 20;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: calc(0.75rem + env(safe-area-inset-top)) var(--gutter) 0.75rem;
  font-size: 0.85rem;
  color: var(--ink-2);
  mix-blend-mode: normal;
  pointer-events: none;
}
.topbar > * { pointer-events: auto; }
.topbar-title { font-family: var(--serif); font-style: italic; font-variation-settings: "SOFT" 50, "opsz" 14; }

.lang {
  appearance: none;
  background: transparent;
  border: 1px solid var(--ink-3);
  border-radius: 999px;
  color: var(--ink-2);
  font: inherit;
  font-size: 0.8rem;
  padding: 0.3rem 0.75rem;
  cursor: pointer;
}
.lang:hover, .lang:focus-visible { color: var(--ink); border-color: var(--ink-2); outline: none; }
:focus-visible { outline: 2px solid var(--life); outline-offset: 3px; }

/* ---------- Chapitres ---------- */
main { position: relative; z-index: 1; }

.ch {
  position: relative;
  min-height: 100svh;
  display: grid;
  grid-template-rows: 42svh minmax(0, 1fr);
  grid-template-areas: "scene" "text";
  overflow: hidden;
}
.ch-open, .ch-empty { grid-template-rows: minmax(0, 1fr); grid-template-areas: "text"; }
.ch-grid { grid-template-rows: 62svh minmax(0, 1fr); }
.ch-grid .scene { margin-top: 3.25rem; }

.scene {
  grid-area: scene;
  position: relative;
  min-height: 0;
}
.scene canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
}

.ch-inner {
  grid-area: text;
  align-self: end;
  width: 100%;
  max-width: var(--measure);
  padding: 1rem var(--gutter) calc(2.5rem + env(safe-area-inset-bottom));
}
.ch-open .ch-inner, .ch-empty .ch-inner {
  align-self: center;
  padding-top: 5rem;
}

/* Typographie */
.title {
  font-family: var(--serif);
  font-style: italic;
  font-weight: 400;
  font-variation-settings: "SOFT" 50, "opsz" 24;
  font-size: 1.05rem;
  color: var(--life);
  margin: 0 0 0.75rem;
}
.lead {
  font-family: var(--serif);
  font-weight: 400;
  font-variation-settings: "SOFT" 50, "opsz" 72;
  font-size: clamp(1.55rem, 5.6vw, 2.25rem);
  line-height: 1.2;
  letter-spacing: -0.005em;
  margin: 0 0 0.75rem;
  text-wrap: balance;
}
h1.lead { font-size: clamp(2rem, 8vw, 3.25rem); }
.sub {
  font-size: 1rem;
  color: var(--ink-2);
  margin: 0.5rem 0 0;
  max-width: 34rem;
}
.sub.quiet { color: var(--ink-3); }
.num {
  font-family: var(--serif);
  font-size: clamp(1.4rem, 5vw, 2rem);
  margin: 0.5rem 0;
  line-height: 1.25;
  font-variant-numeric: tabular-nums;
}
.num strong { font-weight: 500; color: var(--life); }

.counter {
  font-family: var(--serif);
  font-weight: 400;
  font-variation-settings: "SOFT" 50, "opsz" 144;
  font-variant-numeric: tabular-nums lining-nums;
  font-size: clamp(2.1rem, 9.5vw, 6rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--life);
  margin: 0;
  white-space: nowrap;
}
.counter-label {
  font-size: 0.95rem;
  color: var(--ink-2);
  margin: 0.4rem 0 0.9rem;
}

.here {
  margin: 1.25rem 0 0;
  font-family: var(--serif);
  font-size: 1.35rem;
  font-variation-settings: "SOFT" 50, "opsz" 48;
}
.here-sub { display: block; font-family: var(--sans); font-size: 0.95rem; color: var(--ink-2); }

.pair { display: grid; gap: 0.25rem; margin: 1.5rem 0 0; font-family: var(--serif); font-size: clamp(1.3rem, 4.5vw, 1.8rem); font-variant-numeric: tabular-nums; }
.pair span:last-child { color: var(--ink-2); }

.ch-calm .scene { opacity: 0.85; }
.ch-end .ch-inner { min-height: 100svh; display: flex; align-items: center; }
.ch-end .lead { color: var(--ink-2); font-size: clamp(1.3rem, 4.5vw, 1.9rem); }
.ch-end .lead strong { color: var(--ink); font-weight: 400; }

/* Révélations pilotées par le scroll (classes posées par main.js). */
.step { opacity: 0.18; transition: opacity 0.6s var(--ease); }
.step.on { opacity: 1; }

/* ---------- Formulaire d'ouverture ---------- */
.birth { display: grid; gap: 1.1rem; margin-top: 1.75rem; }
.field { display: grid; gap: 0.4rem; font-size: 0.9rem; color: var(--ink-2); margin: 0; padding: 0; border: 0; min-width: 0; }
.field legend { padding: 0; margin-bottom: 0.4rem; }
input[type="date"] {
  appearance: none;
  -webkit-appearance: none;
  width: 100%;
  min-width: 0;
  background: var(--bg-2);
  color: var(--ink);
  border: 1px solid var(--ink-3);
  border-radius: 0.4rem;
  padding: 0.7rem 0.85rem;
  font: inherit;
  font-family: var(--serif);
  font-size: 1.25rem;
  font-variant-numeric: tabular-nums;
  color-scheme: dark;
}
input[type="date"]:focus { border-color: var(--life); outline: none; }
.sex { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.sex label {
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--ink-3);
  border-radius: 999px;
  padding: 0.4rem 0.9rem;
  cursor: pointer;
  color: var(--ink-2);
}
.sex input { position: absolute; opacity: 0; width: 1px; height: 1px; }
.sex label:has(input:checked) { border-color: var(--life); color: var(--ink); }
.sex label:has(input:focus-visible) { outline: 2px solid var(--life); outline-offset: 2px; }
.go, .share {
  appearance: none;
  justify-self: start;
  background: var(--life);
  color: var(--bg);
  border: 0;
  border-radius: 999px;
  padding: 0.75rem 1.5rem;
  font: inherit;
  font-weight: 500;
  cursor: pointer;
}
.share { background: transparent; color: var(--life); border: 1px solid var(--life); margin-top: 1.25rem; }
.go:hover, .share:hover { filter: brightness(1.08); }
.hint { font-size: 0.85rem; color: var(--ink-3); margin: 0; min-height: 1.3em; }
.hint.error { color: var(--life); }

/* ---------- Pied de page ---------- */
.foot {
  position: relative;
  z-index: 1;
  background: var(--bg);
  border-top: 1px solid rgba(241, 232, 220, 0.08);
  padding: 3rem var(--gutter) 4rem;
  color: var(--ink-2);
  font-size: 0.85rem;
  max-width: 100%;
}
.foot-note { max-width: 36rem; margin: 0 0 2rem; }
.foot-title { font-family: var(--serif); font-weight: 400; font-style: italic; font-size: 1.1rem; margin: 0 0 1rem; color: var(--ink); }
.sources { max-width: 42rem; margin: 0 0 2rem; padding-left: 1.25rem; display: grid; gap: 0.6rem; }
.sources li { color: var(--ink-3); }
.sources b { font-weight: 500; color: var(--ink-2); }
.sources a { color: var(--ink-2); text-decoration: underline; text-underline-offset: 0.15em; }
.sources a:hover { color: var(--ink); }

/* ---------- Laptop ---------- */
@media (min-width: 1024px) {
  :root { --gutter: 6vw; --measure: 40rem; }
  .ch {
    grid-template-columns: minmax(0, 44%) minmax(0, 1fr);
    grid-template-rows: minmax(0, 1fr);
    grid-template-areas: "text scene";
  }
  .ch-open, .ch-empty { grid-template-columns: minmax(0, 1fr); grid-template-areas: "text"; }
  .ch-open .ch-inner, .ch-empty .ch-inner { max-width: 48rem; margin: 0 auto; }
  .ch-inner { align-self: center; padding: 6rem var(--gutter) 6rem; }
  .ch-grid { grid-template-columns: minmax(0, 36%) minmax(0, 1fr); grid-template-rows: minmax(0, 1fr); }
  .ch-grid .scene { margin: 3rem 0 1rem; }
  .lead { font-size: clamp(2rem, 2.6vw, 2.9rem); }
  h1.lead { font-size: clamp(3rem, 4.5vw, 4.5rem); }
  .counter { font-size: clamp(4rem, 6.4vw, 7.5rem); }
  .sub { font-size: 1.05rem; }
  .pair { grid-template-columns: 1fr 1fr; gap: 2rem; }
  .ch-calm .scene { opacity: 0.7; }
}

/* ---------- Mouvement réduit ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .step { opacity: 1; transition: none; }
  .ch-end .ch-inner { min-height: 60svh; }
}