/* ==========================================================================
   GLASSMORPHISME — verre dépoli teinté sombre sur un fond vivant.
   Le verre est assez teinté pour garder le texte blanc au-dessus de 10:1.
   ========================================================================== */
[data-theme="glass"] {
  --h1-em: 6.85;
  --night: #0B1030;
  --violet: #7C3AED;
  --pink: #DB2777;
  --cyan: #67E8F9;
  --lilac: #C4B5FD;

  --bg: var(--night);
  --ink: #F8FAFC;
  --ink-soft: #DDE4EF;
  --line: rgb(255 255 255 / .14);
  --primary: var(--violet);
  --on-primary: #FFFFFF;
  --focus: var(--cyan);
  --font-display: "Sora", system-ui, sans-serif;
  --font-body: "Sora", system-ui, sans-serif;
  --radius: 24px;
  --radius-btn: 999px;
  --body-size: 1.0625rem;
  --lh: 1.65;

  --glass: linear-gradient(135deg, rgb(255 255 255 / .12), rgb(255 255 255 / .03)), rgb(12 16 44 / .52);
  --glass-edge: 1px solid rgb(255 255 255 / .16);
  --glass-shadow: 0 24px 60px rgb(0 0 0 / .35), inset 0 1px 0 rgb(255 255 255 / .22);
  --blur: blur(24px) saturate(160%);

  color-scheme: dark;

  & body { background: radial-gradient(ellipse at 50% -20%, #1B2360, var(--night) 60%) fixed; }
  & h1, & h2 { font-weight: 700; letter-spacing: -.03em; }
  & h3 { font-weight: 600; letter-spacing: -.01em; }

  /* Formes lumineuses sous le verre */
  & .backdrop { display: block; }
  & .shape { border-radius: 50%; filter: blur(70px); opacity: .5; will-change: transform; }
  & .shape--1 { width: 46vmax; height: 46vmax; left: -12vmax; top: -10vmax; background: var(--violet); animation: gl-drift 26s ease-in-out infinite alternate; }
  & .shape--2 { width: 38vmax; height: 38vmax; right: -12vmax; top: 18vh; background: #EC4899; opacity: .42; animation: gl-drift 32s ease-in-out -8s infinite alternate-reverse; }
  & .shape--3 { width: 34vmax; height: 34vmax; left: 18vw; bottom: -14vmax; background: #06B6D4; opacity: .38; animation: gl-drift 29s ease-in-out -4s infinite alternate; }
  & .shape--4 { width: 20vmax; height: 20vmax; right: 12vw; bottom: 8vh; background: #F59E0B; opacity: .3; animation: gl-drift 36s ease-in-out -12s infinite alternate-reverse; }
  & .shape--5 { display: none; }

  /* Mixin « verre » */
  & :is(.site-header, .bits, .fact, .event, .domain, .exam, .project, .futures__block, .outro > .inner) {
    background: var(--glass);
    -webkit-backdrop-filter: var(--blur);
    backdrop-filter: var(--blur);
    border: var(--glass-edge);
    box-shadow: var(--glass-shadow);
  }

  & .site-header { border-width: 0 0 1px; box-shadow: 0 10px 30px rgb(0 0 0 / .25); background: rgb(11 16 48 / .55); }
  & .brand__mark {
    font-weight: 700;
    background: linear-gradient(90deg, #FFFFFF, var(--cyan));
    -webkit-background-clip: text; background-clip: text;
    color: transparent;
  }
  & .nav__link { padding-inline: .9rem; border-radius: 999px; font-weight: 500; }
  & .nav__link:hover { background: rgb(255 255 255 / .1); }

  & .btn { min-height: 52px; padding-inline: 1.6rem; font-weight: 600; }
  & .btn--primary {
    background: linear-gradient(120deg, var(--violet), var(--pink));
    box-shadow: 0 10px 30px rgb(124 58 237 / .45), inset 0 1px 0 rgb(255 255 255 / .3);
  }
  & .btn--primary:hover { transform: translateY(-2px); box-shadow: 0 16px 40px rgb(219 39 119 / .45), inset 0 1px 0 rgb(255 255 255 / .3); }
  & .btn--ghost {
    border: 1px solid rgb(255 255 255 / .28);
    background: rgb(255 255 255 / .08);
    -webkit-backdrop-filter: blur(12px); backdrop-filter: blur(12px);
  }
  & .btn--ghost:hover { background: rgb(255 255 255 / .16); }

  & .eyebrow { color: var(--cyan); font-weight: 600; }
  & .hero__line--3 {
    width: fit-content;
    background: linear-gradient(90deg, #A5B4FC, #F0ABFC 50%, var(--cyan));
    -webkit-background-clip: text; background-clip: text;
    color: transparent;
    padding-bottom: .06em;
  }

  & .bits { padding: 1.75rem; border-radius: 28px; }
  & .bit {
    border-radius: 12px;
    background: rgb(255 255 255 / .07);
    border: 1px solid rgb(255 255 255 / .14);
    color: var(--ink-soft);
    font-weight: 500;
  }
  & .bit:hover { background: rgb(255 255 255 / .14); }
  & .bit[aria-pressed="true"] {
    background: linear-gradient(160deg, var(--cyan), var(--lilac));
    border-color: transparent;
    color: var(--night);
    font-weight: 700;
    box-shadow: 0 0 18px rgb(103 232 249 / .55);
  }
  & .byte__char { color: #FFFFFF; font-weight: 600; }
  & .bits__reset { border-color: rgb(255 255 255 / .3); background: rgb(255 255 255 / .06); }
  & .bits__reset:hover { background: rgb(255 255 255 / .14); }
  & .bits__output { color: var(--cyan); }

  & .facts { gap: 1rem; }
  & .fact { padding: 1.2rem 1.4rem; border-radius: 20px; }
  & .fact__value { font-weight: 600; }

  & .timeline {
    max-width: none;
    grid-template-columns: repeat(auto-fill, minmax(min(100%, 19rem), 1fr));
    gap: 1rem;
  }
  & .event { grid-template-columns: minmax(0, 1fr); gap: .4rem; padding: 1.5rem; border-radius: var(--radius); }
  & .event__year {
    width: fit-content;
    font-size: 2.2rem; font-weight: 700; letter-spacing: -.03em;
    background: linear-gradient(90deg, #FFFFFF, var(--lilac));
    -webkit-background-clip: text; background-clip: text;
    color: transparent;
  }
  & .event[data-kind="science"] .event__year { background-image: linear-gradient(90deg, #FFFFFF, var(--cyan)); }
  & .event--key { border-color: rgb(103 232 249 / .6); box-shadow: 0 0 0 1px rgb(103 232 249 / .3), 0 24px 60px rgb(6 182 212 / .25); }
  & .event__tag { color: var(--cyan); }

  & .domain, & .project { border-radius: var(--radius); transition: transform .3s, border-color .3s; }
  & .domain:hover, & .project:hover { transform: translateY(-4px); border-color: rgb(255 255 255 / .3); }
  & .domain__years { gap: .6rem; }
  & .domain__year { padding: .7rem .9rem; border-radius: 14px; background: rgb(255 255 255 / .05); }
  & .domain__year dt { color: var(--cyan); }
  & .exam { border-radius: var(--radius); }
  & .exam__v { color: var(--cyan); }

  & .project__icon {
    width: 56px; height: 56px; padding: 13px;
    border-radius: 16px;
    background: linear-gradient(140deg, rgb(124 58 237 / .9), rgb(219 39 119 / .9));
    color: #FFFFFF;
    box-shadow: 0 8px 20px rgb(124 58 237 / .4);
  }
  & .tag { border-radius: 999px; background: rgb(255 255 255 / .08); border: 1px solid rgb(255 255 255 / .14); font-weight: 500; }

  & .futures__block { padding: 1.75rem; border-radius: var(--radius); }
  & .path__len { padding: .15rem .7rem; border-radius: 999px; background: rgb(103 232 249 / .14); color: var(--cyan); }
  & .job { border-radius: 999px; background: rgb(255 255 255 / .08); border: 1px solid rgb(255 255 255 / .16); font-weight: 500; }

  & .outro > .inner {
    width: calc(100% - var(--gutter) * 2);
    max-width: 880px;
    margin-block: var(--section-pad);
    padding: clamp(3rem, 7vw, 5rem) clamp(1.5rem, 5vw, 4rem);
    border-radius: 36px;
  }

  & .site-footer { border-top: 1px solid var(--line); background: rgb(11 16 48 / .6); }
}

/* Navigateurs sans backdrop-filter : verre plus opaque */
@supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
  [data-theme="glass"] { --glass: rgb(20 26 66 / .92); }
}

@keyframes gl-drift {
  0% { transform: translate3d(0, 0, 0) scale(1); }
  100% { transform: translate3d(6vw, 8vh, 0) scale(1.15); }
}