/* =========================================================
   Sillage — base.css
   Jetons de design, typographie, primitives de mise en page.
   Aucune couleur en dur ailleurs que dans ce fichier.
   ========================================================= */

:root {
  /* --- Surfaces --------------------------------------- */
  --sil-sand:        #F7F3EC;
  --sil-card:        #FFFDF9;
  --sil-band:        #EFE9DE;

  /* --- Indigo ----------------------------------------- */
  --sil-indigo:      #1B2440;
  --sil-indigo-mid:  #2E3C63;
  --sil-indigo-soft: #6B7899;
  --sil-indigo-wash: #E7E9F0;

  /* --- Terre cuite (accent unique) --------------------- */
  --sil-terra:       #B4552F;
  --sil-terra-dark:  #98431F;
  --sil-terra-wash:  #F6E7DF;

  /* --- Sauge (teinte secondaire) ----------------------- */
  --sil-sage:        #7C8A6F;
  --sil-sage-deep:   #55613F;
  --sil-sage-wash:   #EBEFE6;
  --sil-sage-mid:    #C3CDB8;

  /* --- Texte ------------------------------------------ */
  --sil-ink:         #191C22;
  --sil-ink-2:       #565C67;
  --sil-ink-3:       #8B9099;
  --sil-on-dark:     #F1EEE7;
  --sil-on-terra:    #FFFDF9;
  --sil-on-dark-2:   #B7BECF;

  /* --- Filets ----------------------------------------- */
  --sil-rule:        rgba(25, 28, 34, .14);
  --sil-rule-strong: rgba(25, 28, 34, .28);
  --sil-rule-dark:   rgba(241, 238, 231, .18);

  /* --- Voile photo ------------------------------------ */
  --sil-scrim: linear-gradient(180deg, rgba(27, 36, 64, .10), rgba(27, 36, 64, .72));

  /* --- Typographie ------------------------------------ */
  --sil-serif: "Fraunces", "Spectral", "Iowan Old Style", "Palatino Linotype", Georgia, serif;
  --sil-sans:  "Inter", "Manrope", "Helvetica Neue", Arial, system-ui, sans-serif;

  --sil-t-xl:   clamp(2.6rem, 1.5rem + 4.4vw, 4.6rem);
  --sil-t-lg:   clamp(2rem, 1.35rem + 2.6vw, 3.2rem);
  --sil-t-md:   clamp(1.55rem, 1.2rem + 1.4vw, 2.25rem);
  --sil-t-sm:   clamp(1.2rem, 1.05rem + .6vw, 1.5rem);
  --sil-t-body: 1.0625rem;
  --sil-t-small: .9375rem;
  --sil-t-micro: .68rem;

  /* --- Espacements ------------------------------------ */
  --sil-s1: 4px;
  --sil-s2: 8px;
  --sil-s3: 16px;
  --sil-s4: 24px;
  --sil-s5: 40px;
  --sil-s6: 64px;
  --sil-s7: 96px;
  --sil-s8: 140px;

  --sil-gutter: clamp(20px, 5vw, 56px);
  --sil-max: 1240px;
  --sil-measure: 70ch;

  --sil-radius: 3px;
  --sil-ease: 220ms cubic-bezier(.4, 0, .2, 1);
  --sil-header-h: 72px;
}

/* === sil-body — page ==================================== */
.sil-body {
  background-color: var(--sil-sand);
  color: var(--sil-ink);
  font-family: var(--sil-sans);
  font-size: var(--sil-t-body);
  font-weight: 400;
  line-height: 1.7;
  font-feature-settings: "kern" 1, "liga" 1;
  overflow-x: hidden;
}

/* === sil-shell — conteneur centré ======================= */
.sil-shell {
  width: 100%;
  max-width: var(--sil-max);
  margin-inline: auto;
  padding-inline: var(--sil-gutter);
}

.sil-shell--narrow { max-width: 900px; }

/* === sil-section — rythme vertical ====================== */
.sil-section {
  padding-block: clamp(64px, 8vw, 104px);
  border-top: 1px solid var(--sil-rule);
}

.sil-section--flush { border-top: 0; }
.sil-section--band { background-color: var(--sil-band); border-top: 0; }
.sil-section--sage { background-color: var(--sil-sage-wash); border-top: 0; }
.sil-section--indigo {
  background-color: var(--sil-indigo);
  color: var(--sil-on-dark);
  border-top: 0;
}
.sil-section--tight { padding-block: clamp(48px, 5vw, 72px); }

.sil-section__head {
  display: grid;
  gap: var(--sil-s3);
  margin-bottom: var(--sil-s6);
  max-width: 62ch;
}

.sil-section__foot {
  margin-top: var(--sil-s5);
  padding-top: var(--sil-s4);
  border-top: 1px solid var(--sil-rule);
}

/* === sil-eyebrow — micro-libellé ======================== */
.sil-eyebrow {
  font-size: var(--sil-t-micro);
  letter-spacing: .14em;
  text-transform: uppercase;
  font-weight: 600;
  color: var(--sil-terra);
  display: flex;
  align-items: center;
  gap: var(--sil-s2);
}

.sil-eyebrow--muted { color: var(--sil-ink-3); }
.sil-eyebrow--light { color: var(--sil-on-dark-2); }

/* === sil-title — titres sérif =========================== */
.sil-title {
  font-family: var(--sil-serif);
  font-weight: 500;
  line-height: 1.12;
  letter-spacing: -.02em;
  color: var(--sil-indigo);
  text-wrap: balance;
}

.sil-title--xl { font-size: var(--sil-t-xl); }
.sil-title--lg { font-size: var(--sil-t-lg); }
.sil-title--md { font-size: var(--sil-t-md); }
.sil-title--sm { font-size: var(--sil-t-sm); line-height: 1.24; }
.sil-title--light { color: var(--sil-on-dark); }
.sil-title--italic { font-style: italic; font-weight: 400; }

/* === sil-lede — chapô =================================== */
.sil-lede {
  font-size: clamp(1.0625rem, 1rem + .35vw, 1.2rem);
  line-height: 1.62;
  color: var(--sil-ink-2);
  max-width: var(--sil-measure);
}

.sil-lede--light { color: var(--sil-on-dark-2); }
.sil-lede--spaced { margin-top: var(--sil-s4); }

/* === sil-prose — blocs de texte courant ================= */
.sil-prose {
  display: grid;
  gap: var(--sil-s4);
  max-width: var(--sil-measure);
  color: var(--sil-ink-2);
}

.sil-prose--light { color: var(--sil-on-dark-2); }

/* === sil-link — lien de texte =========================== */
.sil-link {
  color: var(--sil-indigo-mid);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: .22em;
  text-decoration-color: var(--sil-rule-strong);
  transition: color var(--sil-ease), text-decoration-color var(--sil-ease);
}

.sil-link:hover { color: var(--sil-terra); text-decoration-color: var(--sil-terra); }
.sil-link--light { color: var(--sil-on-dark); }

/* === sil-icon — sprite SVG ============================== */
.sil-icon {
  width: 24px;
  height: 24px;
  flex: none;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.5;
  stroke-linecap: round;
  stroke-linejoin: round;
  transition: color var(--sil-ease);
}

.sil-icon--sm { width: 18px; height: 18px; }
.sil-icon--lg { width: 32px; height: 32px; }
.sil-icon--terra { color: var(--sil-terra); }

.sil-sprite { display: none; }

/* === sil-skip — lien d'évitement ======================== */
.sil-skip {
  position: absolute;
  left: var(--sil-s4);
  top: -200px;
  z-index: 200;
  background-color: var(--sil-indigo);
  color: var(--sil-on-dark);
  padding: var(--sil-s3) var(--sil-s4);
  border-radius: var(--sil-radius);
  transition: top var(--sil-ease);
}

.sil-skip:focus-visible { top: var(--sil-s3); }

/* === sil-reveal — apparition au défilement ============== */
.sil-reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 620ms cubic-bezier(.4, 0, .2, 1), transform 620ms cubic-bezier(.4, 0, .2, 1);
}

.sil-reveal--is-visible { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  .sil-reveal { opacity: 1; transform: none; }
}

/* === Accessibilité — focus & masquage =================== */
.sil-vh {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

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

::selection { background-color: var(--sil-terra-wash); color: var(--sil-ink); }