/* ============================================================
   PRÉSENS — DESIGN SYSTEM « Liquid Glass »
   Tokens, échelle typographique, composant .glass, utilitaires.
   Les filtres SVG (#chroma, #liquid, #threadGlow) sont définis
   dans un <svg> caché côté HTML (voir partial defs).
   ============================================================ */

/* ── 1. TOKENS ──────────────────────────────────────────── */
:root {
  /* Palette stricte (charte Présens validée) */
  --cream:       #F0F5F2;
  --onyx:        #0E1F18;
  --forest:      #1F3A2D;
  --cta:         #2D6B52;
  --mint:        #9BEAC8;
  --sage:        #B8DDC8;
  --mint-vivid:  #7DF0B5;
  --gold:        #C9A876;   /* accent fonctionnel discret — jamais en aplat */

  /* Dérivés de fond (respiration clair / mid / profond) */
  --bg-deep:     #0B1812;   /* onyx + sombre, zones profondes */
  --bg-mid:      #16291F;   /* forest atténué */
  --bg-card:     #16291F;

  /* Texte */
  --text-primary:   #F0F5F2;
  --text-secondary: #9CADA5;
  --text-tertiary:  #6B7A73;

  /* Typographie */
  --font-display: 'Lora', Georgia, serif;
  --font-ui:      'Space Grotesk', system-ui, sans-serif;
  --font-body:    'Inter', system-ui, sans-serif;

  /* Échelle fluide (clamp) */
  --fs-eyebrow: clamp(0.68rem, 0.62rem + 0.3vw, 0.78rem);
  --fs-body:    clamp(0.95rem, 0.9rem + 0.3vw, 1.05rem);
  --fs-lead:    clamp(1.05rem, 0.98rem + 0.5vw, 1.25rem);
  --fs-h3:      clamp(1.25rem, 1.1rem + 0.8vw, 1.6rem);
  --fs-h2:      clamp(1.8rem, 1.4rem + 2vw, 2.9rem);
  --fs-display: clamp(2.6rem, 1.8rem + 4.2vw, 5rem);

  /* Letter-spacing labels Space Grotesk uppercase */
  --ls-label: 0.18em;

  /* Rayons / profondeur */
  --radius-sm:   10px;
  --radius-md:   16px;
  --radius-lg:   24px;
  --radius-pill: 999px;

  /* Couches de verre */
  --glass-blur: 18px;
  --glass-bg:   linear-gradient(135deg, rgba(240,245,242,0.10), rgba(240,245,242,0.03));
  --glass-border: rgba(184,221,200,0.35);
  --glass-inner-light: inset 0 1px 0 rgba(240,245,242,0.25);
  --glass-shadow: 0 24px 60px rgba(10,20,16,0.35);

  /* Durées */
  --t-fast: 200ms;
  --t-med:  450ms;
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
}

/* ── 2. BASE ────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { -webkit-text-size-adjust: 100%; }

body {
  background: var(--onyx);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-weight: 300;
  font-size: var(--fs-body);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection { background: rgba(125,240,181,0.25); color: var(--cream); }

/* ── 3. TYPOGRAPHIE ─────────────────────────────────────── */
.eyebrow {
  font-family: var(--font-ui);
  font-size: var(--fs-eyebrow);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: var(--ls-label);
  color: var(--text-secondary);
}

.display {
  font-family: var(--font-display);
  font-size: var(--fs-display);
  font-weight: 500;
  line-height: 1.04;
  letter-spacing: -0.01em;
}
.display em { font-style: italic; color: var(--mint); }

h1, .h1 { font-family: var(--font-display); font-size: var(--fs-display); font-weight: 500; line-height: 1.05; }
h2, .h2 { font-family: var(--font-display); font-size: var(--fs-h2); font-weight: 500; line-height: 1.1; }
h3, .h3 { font-family: var(--font-display); font-size: var(--fs-h3); font-weight: 500; line-height: 1.2; }

.lead { font-size: var(--fs-lead); color: var(--text-secondary); font-weight: 300; }
.num  { font-family: var(--font-ui); font-feature-settings: "tnum"; }

/* ── 4. COMPOSANT .glass ───────────────────────────────────
   Empilement : fond translucide → blur+saturation → bordure
   verre + liseré interne → reflet spéculaire (::before) →
   ombre de profondeur. Réfraction liquide en option (.glass--liquid).
   ──────────────────────────────────────────────────────── */
.glass {
  position: relative;
  background: var(--glass-bg);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(160%);
  backdrop-filter: blur(var(--glass-blur)) saturate(160%);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--glass-shadow), var(--glass-inner-light);
  overflow: hidden;
  isolation: isolate;
}

/* Reflet spéculaire — suit la souris via --mx/--my (0–100%), drift par défaut */
.glass::before {
  content: '';
  position: absolute;
  inset: -1px;
  pointer-events: none;
  background:
    radial-gradient(220px 220px at var(--mx, 30%) var(--my, 0%),
      rgba(255,255,255,0.12), rgba(255,255,255,0) 60%),
    linear-gradient(125deg, rgba(255,255,255,0.10) 0%, rgba(255,255,255,0) 40%);
  opacity: 0.8;
  transition: background var(--t-fast) linear;
  z-index: 1;
}

/* Le contenu passe au-dessus du reflet */
.glass > * { position: relative; z-index: 2; }

/* Variante claire (verre sur fond clair) */
.glass--light {
  background: linear-gradient(135deg, rgba(14,31,24,0.06), rgba(14,31,24,0.02));
  border-color: rgba(31,58,45,0.18);
  box-shadow: 0 24px 60px rgba(10,20,16,0.12), inset 0 1px 0 rgba(255,255,255,0.5);
}

/* Variante signature : réfraction liquide (réservée à 2-3 éléments) */
.glass--liquid::after {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
  /* le filtre déplace ce voile, donnant l'ondulation derrière le verre */
  background: linear-gradient(135deg, rgba(155,234,200,0.05), rgba(125,240,181,0.02));
  filter: url(#liquid);
  z-index: 0;
}

/* Fallback élégant si backdrop-filter indisponible */
@supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
  .glass        { background: rgba(22,41,31,0.92); }
  .glass--light { background: rgba(240,245,242,0.92); }
}

/* ── 5. ABERRATION CHROMATIQUE ─────────────────────────────
   - .chroma-svg : applique le filtre SVG (titres hero, fil).
   - .chroma-hover : alternative GPU-friendly (ombres décalées). */
.chroma-svg { filter: url(#chroma); }

.chroma-hover { transition: text-shadow var(--t-fast) var(--ease-out); }
.chroma-hover:hover {
  text-shadow:
    -1.5px 0 rgba(255,46,92,0.55),
     1.5px 0 rgba(40,150,255,0.55);
}

/* Flash d'aberration au chargement (ajouter/retirer la classe en JS) */
.chroma-flash { animation: chroma-flash 320ms var(--ease-out) both; }
@keyframes chroma-flash {
  0%   { text-shadow: -6px 0 rgba(255,46,92,0.8), 6px 0 rgba(40,150,255,0.8); }
  100% { text-shadow: 0 0 rgba(255,46,92,0), 0 0 rgba(40,150,255,0); }
}

/* ── 6. BOUTONS ────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 28px;
  border-radius: var(--radius-pill);
  font-family: var(--font-ui);
  font-size: 0.82rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: var(--ls-label);
  text-decoration: none;
  cursor: pointer;
  border: 1px solid transparent;
  transition: transform var(--t-fast) var(--ease-out),
              background var(--t-fast) var(--ease-out),
              box-shadow var(--t-fast) var(--ease-out);
  will-change: transform;
}
.btn--primary {
  background: var(--cta);
  color: var(--cream);
  box-shadow: 0 8px 24px rgba(45,107,82,0.35);
}
.btn--primary:hover {
  background: #347a5d;
  box-shadow: 0 10px 30px rgba(45,107,82,0.5),
             -1.5px 0 rgba(255,46,92,0.4), 1.5px 0 rgba(40,150,255,0.4);
}
.btn--ghost {
  background: transparent;
  color: var(--text-primary);
  border-color: var(--glass-border);
}
.btn--ghost:hover { border-color: var(--sage); color: var(--cream); }

/* ── 7. ACCENTS / BADGES ───────────────────────────────── */
.badge-gold {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-ui);
  font-size: 0.66rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--gold);
  border: 1px solid rgba(201,168,118,0.45);
  border-radius: var(--radius-pill);
  padding: 4px 12px;
  background: rgba(201,168,118,0.08);
}

/* ── 8. ORBES / LUEURS DE FOND ─────────────────────────── */
.orb {
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
  filter: blur(90px);
  z-index: 0;
}
.orb--mint  { background: radial-gradient(circle, rgba(155,234,200,0.45), transparent 70%); }
.orb--vivid { background: radial-gradient(circle, rgba(125,240,181,0.4), transparent 70%); }
.orb--forest{ background: radial-gradient(circle, rgba(31,58,45,0.6), transparent 70%); }

/* ── 9. UTILITAIRES ────────────────────────────────────── */
.wrap { width: 100%; max-width: 1100px; margin-inline: auto; padding-inline: clamp(20px, 5vw, 48px); }
.stack-sm > * + * { margin-top: 10px; }
.stack    > * + * { margin-top: 20px; }
.muted { color: var(--text-tertiary); }
.center { text-align: center; }

/* ── 10. ACCESSIBILITÉ / PERF ──────────────────────────── */
:focus-visible {
  outline: 2px solid var(--mint-vivid);
  outline-offset: 3px;
  border-radius: 4px;
}

/* Sous 768px : on allège le verre (coût GPU mobile) */
@media (max-width: 768px) {
  :root { --glass-blur: 12px; }
  .orb { filter: blur(70px); }
}

/* Mouvement réduit : on coupe liquide, reflet animé, aberration */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  .glass--liquid::after { filter: none; }
  .chroma-svg { filter: none; }
  .chroma-hover:hover { text-shadow: none; }
}