/* =========================================================================
   layout.css — arrière-plan, conteneurs, navigation, sections, pied de page
   ========================================================================= */

/* --- Arrière-plan atmosphérique ---------------------------------------- */
.aurora {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  background:
    radial-gradient(120% 90% at 50% -10%, #101833 0%, var(--ink-900) 55%, var(--ink-950) 100%);
  pointer-events: none;
}
.aurora__blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  opacity: .5;
  will-change: transform;
}
.aurora__blob--gold {
  width: 46vw; height: 46vw;
  top: -14vw; right: -10vw;
  background: radial-gradient(circle, rgba(201,162,77,.42), transparent 65%);
  animation: drift-a 26s ease-in-out infinite alternate;
}
.aurora__blob--blue {
  width: 52vw; height: 52vw;
  bottom: -20vw; left: -14vw;
  background: radial-gradient(circle, rgba(64,96,200,.32), transparent 66%);
  animation: drift-b 32s ease-in-out infinite alternate;
}
.aurora__grain {
  position: absolute;
  inset: -50%;
  opacity: .045;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* --- Conteneur & sections ---------------------------------------------- */
.container {
  width: 100%;
  max-width: calc(var(--container) + 2.5rem);
  margin-inline: auto;
  padding-inline: 1.25rem;
}

.section { padding: var(--sp-7) 0; position: relative; }
.section--tight { padding: var(--sp-6) 0; }
.section--tint {
  background:
    linear-gradient(180deg, transparent, rgba(13,19,34,.85) 12%, rgba(13,19,34,.85) 88%, transparent);
}

.section__head { max-width: 44rem; margin-bottom: var(--sp-5); }
.section__head--center { margin-inline: auto; text-align: center; }
.section__head--center .eyebrow::before { display: none; }
.section__title { margin-bottom: var(--sp-2); }
.section__title em { color: var(--gold-300); font-style: italic; }
.section__lead { font-size: var(--fs-lg); color: var(--muted); margin: 0; }

.grid { display: grid; gap: var(--sp-3); }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 17rem), 1fr)); }

/* --- Navigation --------------------------------------------------------- */
.nav {
  position: fixed;
  inset: 0 0 auto;
  z-index: 100;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  transition: background .45s var(--ease), border-color .45s var(--ease), backdrop-filter .45s;
  border-bottom: 1px solid transparent;
}
.nav.is-stuck {
  background: rgba(7, 10, 18, .72);
  backdrop-filter: saturate(160%) blur(14px);
  -webkit-backdrop-filter: saturate(160%) blur(14px);
  border-bottom-color: var(--line-2);
}
.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-3);
}

.brand { display: inline-flex; align-items: center; gap: .7rem; }
.brand__mark {
  display: grid;
  place-items: center;
  width: 36px; height: 36px;
  border-radius: 9px;
  background: var(--grad-gold);
  color: var(--ink-900);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: .9rem;
  letter-spacing: .02em;
  box-shadow: var(--glow-gold);
}
.brand__text {
  display: flex;
  flex-direction: column;
  font-family: var(--font-display);
  font-size: 1.02rem;
  line-height: 1.12;
  color: #fff;
}
.brand__text em {
  font-size: .68rem;
  font-family: var(--font-body);
  font-style: normal;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--gold-400);
}

.nav__links { display: flex; align-items: center; gap: var(--sp-3); }
.nav__links > a:not(.btn) {
  position: relative;
  font-size: var(--fs-sm);
  color: var(--text-soft);
  padding: .4rem 0;
  transition: color .3s var(--ease);
}
.nav__links > a:not(.btn)::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 100%; height: 1px;
  background: var(--grad-gold);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform .4s var(--ease-out);
}
.nav__links > a:not(.btn):hover,
.nav__links > a.is-active { color: #fff; }
.nav__links > a:not(.btn):hover::after,
.nav__links > a.is-active::after { transform: scaleX(1); transform-origin: left; }

.nav__burger {
  display: none;
  width: 44px; height: 44px;
  padding: 12px 10px;
  flex-direction: column;
  justify-content: space-between;
}
.nav__burger span {
  height: 1.5px;
  background: var(--text);
  border-radius: 2px;
  transition: transform .35s var(--ease), opacity .25s;
}
.nav__burger[aria-expanded="true"] span:nth-child(1) { transform: translateY(9px) rotate(45deg); }
.nav__burger[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav__burger[aria-expanded="true"] span:nth-child(3) { transform: translateY(-9px) rotate(-45deg); }

/* --- Héro --------------------------------------------------------------- */
.hero {
  padding-top: calc(var(--nav-h) + var(--sp-6));
  padding-bottom: var(--sp-6);
  min-height: min(100svh, 980px);
  display: flex;
  align-items: center;
}
.hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(0, 1fr);
  align-items: center;
  gap: clamp(2rem, 4vw, 4.5rem);
  width: 100%;
}
.hero__copy { position: relative; z-index: 2; min-width: 0; }
.hero__title { margin-bottom: var(--sp-3); padding-top: .06em; }
.hero__lead {
  font-size: var(--fs-lg);
  color: var(--text-soft);
  max-width: 34rem;
  margin-bottom: var(--sp-4);
}
.hero__cta { display: flex; flex-wrap: wrap; gap: var(--sp-2); margin-bottom: var(--sp-4); }

.hero__trust {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  flex-wrap: wrap;
  padding-top: var(--sp-3);
  border-top: 1px solid var(--line-2);
}
.hero__trust li { display: flex; flex-direction: column; }
.hero__trust strong {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 600;
  color: #fff;
  line-height: 1.1;
}
.hero__trust span { font-size: var(--fs-xs); color: var(--muted); letter-spacing: .05em; }
.hero__trust-sep { width: 1px; height: 30px; background: var(--line); }

.hero__scroll {
  position: absolute;
  left: 50%; bottom: 1.6rem;
  transform: translateX(-50%);
  width: 24px; height: 40px;
  border: 1px solid var(--line);
  border-radius: 14px;
  display: grid;
  place-items: start center;
  padding-top: 7px;
}
.hero__scroll span {
  width: 3px; height: 7px;
  border-radius: 2px;
  background: var(--gold-400);
  animation: scroll-cue 2s var(--ease) infinite;
}

/* --- Salle de lecture --------------------------------------------------- */
.reading-room { scroll-margin-top: var(--nav-h); }
.reading-room__frame {
  position: relative;
  padding: clamp(1.5rem, 4vw, 3.5rem) clamp(1rem, 3vw, 3rem);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background:
    radial-gradient(80% 120% at 50% 0%, rgba(226,193,118,.07), transparent 60%),
    linear-gradient(180deg, rgba(19,27,48,.75), rgba(10,14,27,.85));
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}
.reading-room__frame::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--grad-halo);
  pointer-events: none;
}
.reading-room__cta {
  margin: var(--sp-4) 0 0;
  text-align: center;
  font-size: var(--fs-lg);
  color: var(--muted);
}

/* --- Auteur -------------------------------------------------------------- */
.author {
  display: grid;
  grid-template-columns: minmax(0, .82fr) minmax(0, 1fr);
  align-items: center;
  gap: clamp(2rem, 5vw, 5rem);
}
.author__media {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--line);
  box-shadow: var(--shadow-lg);
  isolation: isolate;
}
.author__media img { width: 100%; }
.author__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 45%, rgba(5,7,14,.92));
}
.author__badge {
  position: absolute;
  left: 1.25rem; bottom: 1.25rem;
  z-index: 2;
  display: flex;
  flex-direction: column;
}
.author__badge strong { font-family: var(--font-display); font-size: 1.35rem; color: #fff; }
.author__badge span { font-size: var(--fs-xs); letter-spacing: .14em; text-transform: uppercase; color: var(--gold-400); }

.author__copy p { max-width: 36rem; }
.author__facts {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-4);
  margin-top: var(--sp-4);
  padding-top: var(--sp-3);
  border-top: 1px solid var(--line-2);
}
.author__facts li { display: flex; flex-direction: column; }
.author__facts strong {
  font-family: var(--font-display);
  font-size: 2rem;
  color: var(--gold-300);
  line-height: 1;
}
.author__facts span { font-size: var(--fs-xs); color: var(--muted); }

/* --- Pied de page -------------------------------------------------------- */
.footer {
  border-top: 1px solid var(--line-2);
  padding: var(--sp-5) 0 calc(var(--sp-4) + env(safe-area-inset-bottom));
  background: rgba(5,7,14,.6);
}
.footer__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-3);
}
.footer__links { display: flex; flex-wrap: wrap; gap: var(--sp-3); }
.footer__links a { font-size: var(--fs-sm); color: var(--muted); transition: color .3s var(--ease); }
.footer__links a:hover { color: var(--gold-300); }
.footer__legal { width: 100%; margin: 0; font-size: var(--fs-xs); color: #5C6478; }

/* =========================== RESPONSIVE ================================= */
@media (max-width: 1024px) {
  .hero__grid { grid-template-columns: 1fr; gap: var(--sp-5); }
  .hero { min-height: auto; padding-top: calc(var(--nav-h) + var(--sp-5)); }
  .hero__copy { max-width: 42rem; }
  .hero__scroll { display: none; }
  .author { grid-template-columns: 1fr; }
  .author__media { max-width: 26rem; }
}

@media (max-width: 760px) {
  :root { --sp-7: 4.5rem; --sp-6: 3.25rem; }

  .nav__burger { display: flex; }

  /* Le nom de la collection tient sur une ligne sur petit écran */
  .brand__text { font-size: .95rem; }
  .brand__text em { font-size: .56rem; letter-spacing: .1em; }
  .nav__links {
    position: fixed;
    inset: var(--nav-h) 0 auto;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: var(--sp-3) 1.25rem calc(var(--sp-4) + env(safe-area-inset-bottom));
    background: rgba(7,10,18,.97);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    border-bottom: 1px solid var(--line-2);
    transform: translateY(-12px);
    opacity: 0;
    visibility: hidden;
    transition: opacity .3s var(--ease), transform .35s var(--ease-out), visibility .35s;
  }
  .nav__links.is-open { opacity: 1; visibility: visible; transform: none; }
  .nav__links > a:not(.btn) { padding: .85rem 0; border-bottom: 1px solid var(--line-2); font-size: 1.05rem; }
  .nav__links .btn { margin-top: var(--sp-3); justify-content: center; }

  .hero__cta .btn { flex: 1 1 100%; justify-content: center; }
  .hero__trust { gap: var(--sp-2) var(--sp-3); }
  .hero__trust-sep { display: none; }

  .footer__inner { flex-direction: column; align-items: flex-start; }
}