/* ==========================================================================
   TnFTech → IT NODE : page de transition
   Adaptez les couleurs ci-dessous à la charte IT NODE si besoin.
   ========================================================================== */
:root {
  --bg: #f5f7fb;
  --ink: #14213d;
  --ink-soft: #5b6478;
  --accent: #1d6fe0;
  --accent-2: #12b5c9;
  --logo-w: min(440px, 78vw);
  --logo-h: min(170px, 30vw);
  --font: "Segoe UI", system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;
}

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

html, body { height: 100%; margin: 0; }

body {
  font-family: var(--font);
  color: var(--ink);
  background-color: var(--bg);
  background-image: radial-gradient(rgba(20, 33, 61, .09) 1px, transparent 1px);
  background-size: 22px 22px;
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
}

/* ---------- Fond animé ---------- */
.backdrop { position: fixed; inset: 0; pointer-events: none; overflow: hidden; }
.blob {
  position: absolute;
  width: 55vmax; height: 55vmax;
  border-radius: 50%;
  filter: blur(80px);
  opacity: .22;
  animation: drift 14s ease-in-out infinite alternate;
}
.blob--a { background: var(--accent);   top: -25vmax; left: -15vmax; }
.blob--b { background: var(--accent-2); bottom: -28vmax; right: -18vmax; animation-delay: -7s; }

@keyframes drift {
  to { transform: translate(6vmax, 4vmax) scale(1.08); }
}

/* ---------- Scène ---------- */
.stage {
  position: relative;
  min-height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2rem 1.25rem;
  text-align: center;
  gap: 1.1rem;
}

.eyebrow {
  margin: 0;
  font-size: .85rem;
  font-weight: 600;
  letter-spacing: .32em;
  text-transform: uppercase;
  color: var(--accent);
  opacity: 0;
  transform: translateY(8px);
  transition: opacity .7s ease, transform .7s ease;
}

/* ---------- Logos ---------- */
.logo-box {
  position: relative;
  width: var(--logo-w);
  height: var(--logo-h);
  margin: .5rem 0 .75rem;
}

.logo {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  user-select: none;
  -webkit-user-drag: none;
}

.logo--old {
  opacity: 0;
  transform: scale(.94);
  transition: opacity .8s ease, transform .8s cubic-bezier(.2, .8, .2, 1);
}

.logo--new {
  opacity: 0;
  transform: scale(1.06);
  filter: blur(6px);
  transition: opacity .55s ease, transform .7s cubic-bezier(.2, .8, .2, 1), filter .6s ease;
}

.morph {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  pointer-events: none;
  transition: opacity .45s ease;
}

.ring {
  position: absolute;
  left: 50%; top: 50%;
  width: 40px; height: 40px;
  margin: -20px 0 0 -20px;
  border-radius: 50%;
  border: 2px solid var(--accent);
  opacity: 0;
  pointer-events: none;
}

/* ---------- Textes ---------- */
.headline {
  margin: 0;
  font-size: clamp(1.5rem, 4.2vw, 2.6rem);
  font-weight: 700;
  line-height: 1.2;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: .3em .45em;
}
.headline > span {
  display: inline-block;
  opacity: 0;
  transform: translateY(12px);
  transition: opacity .6s ease, transform .6s ease, color .6s ease;
}
.headline__old { color: var(--ink-soft); position: relative; }
.headline__old::after {
  content: "";
  position: absolute;
  left: -2%; top: 55%;
  width: 104%; height: .08em;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .6s ease;
}
.headline__mid { font-weight: 400; color: var(--ink-soft); }
.headline__new {
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.sub {
  margin: 0;
  max-width: 34rem;
  color: var(--ink-soft);
  font-size: clamp(.95rem, 1.8vw, 1.05rem);
  opacity: 0;
  transition: opacity .7s ease .3s;
}

.progress {
  width: min(260px, 60vw);
  height: 4px;
  margin-top: .8rem;
  border-radius: 4px;
  background: rgba(20, 33, 61, .1);
  overflow: hidden;
  opacity: 0;
  transition: opacity .5s ease;
}
.progress span {
  display: block;
  height: 100%;
  width: 0;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
}

.status {
  margin: 0;
  min-height: 1.4em;
  font-size: .9rem;
  color: var(--ink-soft);
  opacity: 0;
  transition: opacity .5s ease;
}

.skip {
  margin-top: .4rem;
  font-size: .85rem;
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  opacity: 0;
  transition: opacity .5s ease 1s, border-color .2s ease;
}
.skip:hover,
.skip:focus-visible { border-bottom-color: currentColor; }
.skip:focus-visible { outline: 2px solid var(--accent); outline-offset: 4px; border-radius: 2px; }

/* ==========================================================================
   États pilotés par transition.js (classes sur <body>)
   ========================================================================== */

/* 1. Entrée */
.is-intro .eyebrow,
.is-intro .sub,
.is-intro .progress,
.is-intro .status,
.is-intro .skip { opacity: 1; transform: none; }
.is-intro .logo--old { opacity: 1; transform: none; }
.is-intro .headline__old { opacity: 1; transform: none; transition-delay: .15s; }
.is-intro .headline__mid { opacity: 1; transform: none; transition-delay: .35s; }

/* 2. Transformation */
.is-morphing .logo--old { opacity: 0; transition-duration: .25s; }
.is-morphing .morph { opacity: 1; transition-duration: .1s; }
.is-morphing .headline__old::after { transform: scaleX(1); }

/* Variante sans particules (repli CSS) */
.is-morphing.css-morph .logo--old {
  opacity: 0;
  transform: scale(.8) rotate(-2deg);
  filter: blur(10px);
  transition: opacity .9s ease, transform .9s ease, filter .9s ease;
}
.is-morphing.css-morph .logo--new {
  opacity: 1;
  transform: none;
  filter: none;
  transition-delay: .45s;
  transition-duration: .9s;
}

/* 3. Logo final */
.is-done .logo--old { opacity: 0; }
.is-done .logo--new { opacity: 1; transform: none; filter: none; }
.is-done .morph { opacity: 0; }
.is-done .headline__new { opacity: 1; transform: none; }
.is-done .headline__old::after { transform: scaleX(1); }
.is-done .ring { animation: ring 1.1s cubic-bezier(.2, .8, .2, 1) forwards; }

@keyframes ring {
  0%   { opacity: .7; transform: scale(.6); }
  100% { opacity: 0;  transform: scale(9); }
}

/* 4. Sortie */
.is-leaving .stage {
  opacity: 0;
  transform: scale(.985);
  transition: opacity .45s ease, transform .45s ease;
}

/* ---------- Accessibilité : mouvements réduits ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
  }
  .blob { animation: none; }
  .logo--old, .logo--new, .headline > span { transform: none !important; filter: none !important; }
}