/* ============================================================================
   intro-overlay.css — Introduction cinématographique « Laurène ESTOCQ »
   ----------------------------------------------------------------------------
   Overlay plein écran qui révèle le portfolio situé derrière lui.
   Toutes les couleurs sont pilotées par des variables CSS (voir :root ci-dessous)
   pour être modifiables sans toucher au JS.
   ========================================================================== */

.intro-overlay {
  /* ---- Palette (modifiable) ------------------------------------------------ */
  --intro-nuit: #0d1430;      /* Bleu nuit — encre des lettres */
  --intro-corail: #d98a76;    /* Corail doux — accent */
  --intro-ivoire: #f4efe4;    /* Ivoire chaud — voile */
  --intro-sable: #e7dcc7;     /* Beige sable */
  --intro-gris: #d9d6cf;      /* Gris clair — grille, séparateurs */
  --intro-bg: #f6f2ea;        /* Blanc cassé — fond papier */
  --intro-ink: var(--intro-nuit);

  /* ---- Typographie (remplacer par la police du portfolio) ------------------ */
  --intro-font: "Cormorant Garamond", Georgia, "Times New Roman", serif;
  --intro-mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;

  --intro-ease: cubic-bezier(.22, 1, .36, 1);

  position: fixed;
  inset: 0;
  z-index: 9000;
  overflow: hidden;
  background-color: var(--intro-bg);
  color: var(--intro-ink);
  /* Très légère texture papier (grain fractal en SVG, inliné) */
  background-image:
    radial-gradient(120% 90% at 50% 12%, rgba(255,255,255,.6), transparent 60%),
    url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='180' height='180'><filter id='p'><feTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/><feColorMatrix type='saturate' values='0'/></filter><rect width='100%25' height='100%25' filter='url(%23p)' opacity='0.4'/></svg>");
  background-blend-mode: normal, multiply;
  opacity: 1;
  transition: opacity 1.1s var(--intro-ease), visibility 1.1s var(--intro-ease);
  -webkit-font-smoothing: antialiased;
}

/* État « révélé » : le voile s'efface et laisse voir le portfolio net. */
.intro-overlay.is-revealed {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

/* Canvas Three.js — purement décoratif */
.intro-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
}

/* ---- Grille éditoriale (phase 3) ------------------------------------------ */
.intro-grid {
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0;
  mix-blend-mode: multiply;
}
.intro-grid .intro-columns {
  position: absolute;
  inset: 0 clamp(2rem, 8vw, 10rem);
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: clamp(.6rem, 1.6vw, 1.6rem);
}
.intro-grid .intro-columns span {
  border-left: 1px solid var(--intro-gris);
  border-right: 1px solid var(--intro-gris);
  opacity: .5;
}
.intro-grid .intro-baselines {
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(
    to bottom,
    transparent 0,
    transparent calc(clamp(2.2rem, 4vw, 3.4rem) - 1px),
    var(--intro-gris) calc(clamp(2.2rem, 4vw, 3.4rem) - 1px),
    var(--intro-gris) clamp(2.2rem, 4vw, 3.4rem)
  );
  opacity: .35;
}
.intro-grid .intro-margins {
  position: absolute;
  inset: clamp(1.6rem, 5vh, 3.2rem) clamp(2rem, 8vw, 10rem);
  border: 1px solid var(--intro-gris);
  opacity: .6;
}

/* ---- Signature / slogan (phase 5) ----------------------------------------- */
.intro-signature {
  position: absolute;
  left: 50%;
  bottom: clamp(12%, 22vh, 26%);
  transform: translate(-50%, 12px);
  width: min(92vw, 40rem);
  text-align: center;
  opacity: 0;
  pointer-events: none;
}
.intro-slogan {
  margin: 0;
  font-family: var(--intro-font);
  font-weight: 500;
  font-style: italic;
  font-size: clamp(1.4rem, 3.4vw, 2.4rem);
  line-height: 1.25;
  letter-spacing: .01em;
  color: var(--intro-ink);
}
.intro-slogan .intro-morph {
  font-style: italic;
  color: var(--intro-corail);
  display: inline-block;
  min-width: 4.5em;
}
/* petit curseur typographique clignotant */
.intro-caret {
  display: inline-block;
  width: 2px;
  height: 1em;
  margin-left: .12em;
  vertical-align: -0.12em;
  background: var(--intro-ink);
  opacity: 0;
}
.intro-caret.is-blinking { animation: introCaret 1s steps(1) infinite; opacity: 1; }
@keyframes introCaret { 0%, 50% { opacity: 1; } 50.01%, 100% { opacity: 0; } }

/* ---- Bouton « composé » par un typographe ---------------------------------- */
.intro-enter {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  margin-top: clamp(1.4rem, 3vh, 2.2rem);
  padding: .2rem 0;
  background: none;
  border: 0;
  border-bottom: 1px solid transparent;
  color: var(--intro-ink);
  font-family: var(--intro-mono);
  font-size: clamp(.72rem, 1.2vw, .82rem);
  letter-spacing: .22em;
  text-transform: uppercase;
  cursor: pointer;
  pointer-events: auto;
  opacity: 0;
  transition: border-color .4s var(--intro-ease), color .4s var(--intro-ease), gap .4s var(--intro-ease);
}
.intro-enter:hover { border-bottom-color: var(--intro-ink); gap: .9rem; }
.intro-enter .intro-enter-arrow { color: var(--intro-corail); }

/* ---- Skip (dès le début, coin discret) ------------------------------------ */
.intro-skip {
  position: absolute;
  top: clamp(1.1rem, 3vh, 1.8rem);
  right: clamp(1.1rem, 3vw, 2rem);
  z-index: 2;
  background: none;
  border: 0;
  color: var(--intro-ink);
  opacity: .5;
  font-family: var(--intro-mono);
  font-size: .68rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  cursor: pointer;
  pointer-events: auto;
  transition: opacity .3s var(--intro-ease);
}
.intro-skip:hover { opacity: 1; }

/* ---- Nom accessible (SEO + lecteurs d'écran), visuellement caché ---------- */
.intro-sr {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ---- Fallback prefers-reduced-motion -------------------------------------- */
.intro-reduced {
  position: absolute;
  inset: 0;
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1.2rem;
  text-align: center;
  padding: 2rem;
}
.intro-overlay.is-reduced .intro-canvas,
.intro-overlay.is-reduced .intro-grid,
.intro-overlay.is-reduced .intro-signature,
.intro-overlay.is-reduced .intro-skip { display: none; }
.intro-overlay.is-reduced .intro-reduced { display: flex; }
.intro-reduced .intro-name {
  font-family: var(--intro-font);
  font-weight: 600;
  font-size: clamp(2.4rem, 8vw, 5rem);
  letter-spacing: -.01em;
  line-height: 1;
  opacity: 0;
  transition: opacity 1s var(--intro-ease);
}
.intro-reduced .intro-name .intro-caps { letter-spacing: .04em; }
.intro-reduced .intro-red-slogan {
  font-family: var(--intro-font);
  font-style: italic;
  font-size: clamp(1.1rem, 3vw, 1.8rem);
  color: var(--intro-corail);
  opacity: 0;
  transition: opacity 1s var(--intro-ease) .4s;
}
.intro-reduced.is-in .intro-name,
.intro-reduced.is-in .intro-red-slogan { opacity: 1; }

/* ---- Responsive ------------------------------------------------------------ */
@media (max-width: 760px) {
  .intro-signature { bottom: 16vh; }
  .intro-grid .intro-columns { grid-template-columns: repeat(6, 1fr); }
}