/* === Cohérence typographique entre machines === */
html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

:root {
  /*  Palette lagon + sable + texte blanc chaud */
  --bg-light: #b8e3e1;
  --sand: #f6e7c1;
  --ink: #fefcf8;
  --ink-soft: #f2ebe0;
  --glass: rgba(0, 28, 43, 0.35);
  --glass-border: rgba(255, 255, 255, 0.25);
  --shadow: rgba(0, 0, 0, 0.4);
  --safe-gap: clamp(12px, 2.5vmin, 28px);

  --max-prose: 68ch;
  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2rem;
}

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

html,
body {
  height: auto;
  margin: 0;
}

body {
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  justify-content: flex-start;
  padding: var(--safe-gap);
  overflow: auto;
  font-family: ui-serif, Georgia, "Times New Roman", serif;
  color: var(--ink);

  background-image: linear-gradient(
      180deg,
      rgba(255, 255, 255, 0.15),
      rgba(255, 255, 255, 0.05)
    ),
    url("./images/Centre_MDC.jpg");
  background-size: cover;
  background-repeat: no-repeat;
  background-position: 50% 65%;
  background-attachment: fixed;

  perspective: 1600px;
  background-color: var(--bg-light);
  filter: saturate(1.15) contrast(1.05);
}

/* ======= HEADER ======= */
.site-header {
  position: static;
  z-index: 10;
  text-align: center;
  margin-bottom: 0.8rem;
}

.logo {
  height: clamp(72px, 10vw, 110px);
  width: auto;
  opacity: 0.9;
  filter: hue-rotate(10deg) saturate(0.9) brightness(1.1);
  transition: opacity 0.2s ease-in-out;
  margin-inline: auto;
}

.container {
  width: min(100% - 2 * var(--safe-gap), 1200px);
  margin-inline: auto;
}

/* ======= “LETTER” ======= */
.letter {
  position: relative; /* contexte pour bouton langue */
  width: 100%;
  max-width: var(--max-prose);
  margin-inline: auto;
  min-height: auto;
  height: auto;
  max-height: none;

  padding-block-start: clamp(1.2rem, 2.2vmin + 0.5rem, 2.2rem);
  padding-block-end: clamp(1.2rem, 2.2vmin + 0.5rem, 2.2rem);
  padding-inline: clamp(1rem, 2.4vmin + 0.6rem, 2rem);

  border-radius: 16px;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  gap: 0.5rem;

  transform: none;

  background: var(--glass);
  border: 1px solid var(--glass-border);
  box-shadow: 0 6px 16px var(--shadow), 0 1px 0 rgba(255, 255, 255, 0.55) inset;
  -webkit-backdrop-filter: blur(12px) saturate(1.05);
  backdrop-filter: blur(12px) saturate(1.05);
}

.letter::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 16px;
  background: radial-gradient(
    60% 40% at 18% 10%,
    rgba(255, 255, 255, 0.18),
    transparent 60%
  );
  mix-blend-mode: soft-light;
  pointer-events: none;
}

p {
  font-size: clamp(1rem, 1.2vw + 0.6rem, 1.2rem);
  line-height: 1.66;
  color: var(--ink-soft);
  margin: 0 0 0.75rem 0;
  text-wrap: pretty;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.35);
}

.signature {
  margin-top: 0.3rem;
  text-align: right;
  font-style: italic;
  color: var(--ink-soft);
}

a.button {
  align-self: stretch;
  text-align: center;
  text-decoration: none;
  font-weight: 700;
  letter-spacing: 0.2px;
  padding: 0.9rem 1.2rem;
  border-radius: 999px;
  margin-top: 0.6rem;
  background: linear-gradient(180deg, #ffd97f, #f5c45e);
  color: #3b2500;
  border: 1px solid rgba(0, 0, 0, 0.15);
  box-shadow: 0 6px 14px rgba(0, 0, 0, 0.25);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
  white-space: nowrap;
}
a.button:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 18px rgba(0, 0, 0, 0.3);
}

.highlight {
  color: #ffe6ad;
  font-weight: 600;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.45), 0 0 6px rgba(255, 210, 120, 0.55);
}

.intro {
  font-size: 1.1em;
  color: var(--ink);
}

/* ====== Bouton de langue ====== */
.lang-toggle {
  position: absolute;
  top: 0.8rem;
  right: 0.8rem;
  z-index: 10;
  width: 42px;
  height: 42px;
  border-radius: 999px;
  border: 1px solid var(--glass-border);
  background: var(--glass);
  box-shadow: 0 6px 14px var(--shadow), 0 1px 0 rgba(255, 255, 255, 0.45) inset;
  -webkit-backdrop-filter: blur(10px) saturate(1.05);
  backdrop-filter: blur(10px) saturate(1.05);
  display: grid;
  place-items: center;
  font-size: 0;
  line-height: 0;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease, opacity 0.2s ease;
  opacity: 0.95;
}
.lang-toggle:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 18px rgba(0, 0, 0, 0.35);
}
.lang-toggle svg {
  display: block;
  width: 22px;
  height: 22px;
  border-radius: 3px;
}

/* ===== PATCH iOS ===== */
.lang-toggle {
  -webkit-tap-highlight-color: transparent;
  overflow: hidden;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  transform: translateZ(0);
  will-change: transform, opacity;
  contain: paint;
}
.lang-toggle:focus {
  outline: none;
}
@supports (-webkit-touch-callout: none) {
  .lang-toggle {
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    user-select: none;
  }
}

/* ====== Orientation hints ====== */
@media (orientation: portrait) {
  body {
    background-position: 50% 60%;
  }
}
@media (orientation: landscape) {
  body {
    background-position: 50% 70%;
  }
}

/* ========= PALIER 1 — ≥ 48rem ========= */
@media (min-width: 48rem) {
  .container {
    display: grid;
    grid-template-columns: 1fr minmax(0, var(--max-prose)) 1fr;
    gap: var(--space-3);
  }
  .letter {
    grid-column: 2;
  }
  a.button {
    align-self: flex-start;
    width: auto;
  }
}

/* ========= PALIER 2 — ≥ 72rem ========= */
@media (min-width: 72rem) {
  body {
    overflow: hidden;
    background-attachment: fixed;
    justify-content: flex-end;
  }

  .site-header {
    position: absolute;
    top: calc(var(--safe-gap) * 2.5);
    left: calc(var(--safe-gap) * 2.5);
    text-align: left;
    margin: 0;
  }

  .logo {
    height: 150px;
    opacity: 0.85;
    margin: 0;
  }

  .container {
    display: block;
    width: 100%;
  }

  .letter {
    max-width: min(720px, calc(100vw - 2 * var(--safe-gap)));
    width: clamp(320px, 42vw, 720px);
    min-height: clamp(640px, 90dvh, 960px);
    max-height: calc(100dvh - 2 * var(--safe-gap));
    margin-left: auto;
    margin-right: 2%;

    transform: rotateY(-10deg) rotateX(2deg) translateZ(32px);
    transform-origin: center right;
    transform-style: preserve-3d;

    box-shadow: -14px 18px 36px var(--shadow),
      0 1px 0 rgba(255, 255, 255, 0.55) inset;
  }

  .lang-toggle {
    top: 0.8rem;
    right: 0.8rem;
  }
}

/* Interactions tactiles */
@media (hover: none) and (pointer: coarse) {
  a.button:hover {
    transform: none;
    box-shadow: 0 6px 14px rgba(0, 0, 0, 0.25);
  }
  .lang-toggle:hover {
    transform: none;
    box-shadow: 0 6px 14px rgba(0, 0, 0, 0.35);
  }
}

/* === PATCHs d’inclinaison desktop === */
@media (min-width: 72rem) {
  body {
    perspective: 1600px !important;
    perspective-origin: right center;
    transform-style: preserve-3d;
  }
  .letter {
    transform: perspective(1600px) rotateY(-10deg) rotateX(2deg)
      translateZ(32px) !important;
    transform-origin: center right;
    backface-visibility: hidden;
    will-change: transform;
  }
}
@media (min-width: 1024px) and (max-width: 71.999rem) {
  .letter {
    transform: rotateY(-10deg) rotateX(2deg) translateZ(32px) !important;
    transform-origin: center right !important;
  }
}

/* === Ajustement auto si le texte est plus long === */
.letter {
  --prose-scale: 1;
}
@media (min-width: 72rem) {
  .letter p {
    font-size: calc(clamp(1rem, 1.2vw + 0.6rem, 1.2rem) * var(--prose-scale));
    line-height: calc(1.66 * var(--prose-scale));
  }
  .letter .intro {
    font-size: calc(1.1em * var(--prose-scale));
  }
  .letter a.button {
    padding: calc(0.9rem * var(--prose-scale)) calc(1.2rem * var(--prose-scale));
  }
}

/* === FIX FINAL — desktop : aucun débordement de .letter === */
@media (min-width: 72rem) {
  html,
  body {
    height: 100dvh;
  }
  body {
    overflow: hidden;
  }

  .letter {
    max-height: calc(100dvh - 2 * var(--safe-gap));
    overflow-y: auto; /* scroll interne si besoin */
    -webkit-overflow-scrolling: touch;
    scrollbar-gutter: stable;
    padding-bottom: clamp(1rem, 2.5vmin, 2rem);
  }

  /* Effet 3D assuré même avec overflow interne */
  .container .letter {
    transform: perspective(1600px) rotateY(-10deg) rotateX(2deg)
      translateZ(32px) !important;
    transform-origin: center right !important;
  }
}

/* ===== Ajustement desktop moyen : 1201px–1400px ===== */
@media (min-width: 1201px) and (max-width: 1400px) {
  /* On centre la lettre dans le viewport au lieu de la coller en bas */
  body {
    justify-content: center;
  }

  .letter {
    /* largeur et hauteur contrôlées pour tenir dans le 100vh */
    max-width: 40rem;
    width: 100%;
    max-height: calc(100vh - 2 * var(--safe-gap));

    /* pas de scroll interne dans cette plage */
    overflow-y: hidden;

    /* on gère explicitement haut / bas pour le “coussin” du bouton */
    padding-top: 1.2rem;
    padding-bottom: 2rem;
  }

  /* Texte un poil plus compact pour être sûr que tout rentre */
  .letter p {
    font-size: clamp(0.95rem, 1vw + 0.45rem, 1.05rem);
    line-height: 1.5;
  }

  /* Bouton Moana Ora : écart au-dessus, et décollé du bord bas */
  .letter a.button {
    margin-top: 0.75rem;
    align-self: flex-start;
  }
}