/* =========================================================================
   Alliance Boréale — souveraineté numérique
   Thème : aurore boréale · étoiles · constellation
   100 % statique, sans dépendance, sans pistage. Police système (souveraineté).
   ========================================================================= */

:root {
  --bg:        #05060f;
  --bg-2:      #0a0d24;
  --panel:     rgba(255, 255, 255, 0.045);
  --panel-2:   rgba(255, 255, 255, 0.07);
  --border:    rgba(255, 255, 255, 0.10);
  --ink:       #e9ecff;
  --ink-dim:   #99a1c9;
  --ink-faint: #6b739b;

  --aurora-teal:   #4fe3c1;
  --aurora-cyan:   #56c2ff;
  --aurora-violet: #a98bff;
  --aurora-green:  #2ec18f;
  --star:          #ffffff;
  --gold:          #ffd58a;

  --maxw: 1080px;
  --radius: 16px;
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.45);

  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
          Ubuntu, Cantarell, "Noto Sans", "Helvetica Neue", Arial, sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

/* ---------- Ciel : aurore + constellation (fixe, derrière tout) ---------- */
.sky {
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(1200px 700px at 80% -10%, #131a44 0%, transparent 60%),
    radial-gradient(900px 600px at 10% 0%, #0e1640 0%, transparent 55%),
    linear-gradient(180deg, var(--bg-2) 0%, var(--bg) 70%);
}

.sky canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
}

.aurora {
  position: absolute;
  inset: -20% -10% auto -10%;
  height: 70vh;
  filter: blur(60px) saturate(140%);
  opacity: 0.55;
  background:
    radial-gradient(40% 60% at 20% 30%, var(--aurora-teal) 0%, transparent 70%),
    radial-gradient(45% 70% at 55% 20%, var(--aurora-cyan) 0%, transparent 70%),
    radial-gradient(40% 65% at 80% 35%, var(--aurora-violet) 0%, transparent 70%);
  animation: aurora-drift 22s ease-in-out infinite alternate;
}

@keyframes aurora-drift {
  0%   { transform: translate3d(-4%, -2%, 0) scale(1.05); opacity: 0.45; }
  50%  { transform: translate3d(3%, 2%, 0)  scale(1.15); opacity: 0.60; }
  100% { transform: translate3d(6%, -1%, 0) scale(1.08); opacity: 0.50; }
}

/* ---------- Mise en page ---------- */
.wrap { width: min(100% - 2.5rem, var(--maxw)); margin-inline: auto; }

section { padding: clamp(3rem, 7vw, 6rem) 0; }

.eyebrow {
  display: inline-block;
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--aurora-teal);
  margin: 0 0 0.6rem;
}

h1, h2, h3 { line-height: 1.15; letter-spacing: -0.015em; font-weight: 700; }
h1 { font-size: clamp(2.3rem, 6vw, 4rem); margin: 0 0 1rem; }
h2 { font-size: clamp(1.7rem, 3.6vw, 2.5rem); margin: 0 0 1rem; }
h3 { font-size: 1.2rem; margin: 0 0 0.5rem; }

p { color: var(--ink-dim); margin: 0 0 1rem; }
.lead { font-size: clamp(1.05rem, 2vw, 1.3rem); color: var(--ink); max-width: 60ch; }

a { color: var(--aurora-cyan); text-decoration: none; }
a:hover { text-decoration: underline; }

.gradient-text {
  background: linear-gradient(100deg, var(--aurora-teal), var(--aurora-cyan) 45%, var(--aurora-violet));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* ---------- En-tête / navigation ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.9rem clamp(1rem, 4vw, 2.5rem);
  background: rgba(5, 6, 15, 0.55);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}

.brand { display: inline-flex; align-items: center; gap: 0.7rem; color: var(--ink); }
.brand:hover { text-decoration: none; }

.brand-mark {
  width: 30px; height: 30px;
  border-radius: 50%;
  background:
    radial-gradient(circle at 35% 30%, var(--star) 0 2px, transparent 3px),
    conic-gradient(from 200deg, var(--aurora-violet), var(--aurora-cyan), var(--aurora-teal), var(--aurora-violet));
  box-shadow: 0 0 18px rgba(86, 194, 255, 0.55);
  flex: none;
}

.brand-text { display: flex; flex-direction: column; line-height: 1.1; }
.brand-name { font-weight: 700; letter-spacing: 0.01em; }
.brand-sub { font-size: 0.72rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--ink-faint); }

.site-nav ul {
  list-style: none;
  display: flex;
  gap: 0.4rem;
  margin: 0; padding: 0;
}
.site-nav a {
  display: block;
  padding: 0.5rem 0.85rem;
  border-radius: 999px;
  color: var(--ink-dim);
  font-size: 0.95rem;
}
.site-nav a:hover { color: var(--ink); background: var(--panel); text-decoration: none; }
.site-nav a[aria-current="page"] { color: var(--ink); background: var(--panel-2); }

.nav-toggle {
  display: none;
  background: var(--panel);
  border: 1px solid var(--border);
  color: var(--ink);
  border-radius: 10px;
  padding: 0.5rem 0.7rem;
  font-size: 0.95rem;
  cursor: pointer;
}

/* ---------- Héro ---------- */
.hero { padding-top: clamp(3rem, 8vw, 6.5rem); text-align: center; }
.hero .lead { margin-inline: auto; }
.hero-cta { display: flex; gap: 0.8rem; justify-content: center; flex-wrap: wrap; margin-top: 1.8rem; }

/* ---------- Boutons ---------- */
.btn {
  display: inline-block;
  padding: 0.8rem 1.4rem;
  border-radius: 999px;
  font-weight: 600;
  border: 1px solid var(--border);
  color: var(--ink);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-2px); }
.btn-primary {
  background: linear-gradient(100deg, var(--aurora-teal), var(--aurora-cyan));
  color: #04121a;
  border-color: transparent;
  box-shadow: 0 10px 30px rgba(79, 227, 193, 0.25);
}
.btn-primary:hover { box-shadow: 0 14px 38px rgba(86, 194, 255, 0.35); }
.btn-ghost { background: var(--panel); }

/* ---------- Cartes / grilles ---------- */
.grid { display: grid; gap: 1.2rem; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }

.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.6rem;
  backdrop-filter: blur(6px);
}
.card h3 { color: var(--ink); }
.card p:last-child { margin-bottom: 0; }

.star-bullet { color: var(--aurora-teal); margin-right: 0.4rem; }

/* ---------- Le Label : paliers ---------- */
.tiers { display: grid; gap: 1.2rem; grid-template-columns: repeat(3, 1fr); align-items: stretch; }
.tier {
  position: relative;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.8rem 1.6rem;
  overflow: hidden;
}
.tier::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 4px;
}
.tier-1::before { background: var(--aurora-teal); }
.tier-2::before { background: var(--aurora-cyan); }
.tier-3::before { background: var(--aurora-violet); }
.tier .tier-rank { font-size: 0.8rem; letter-spacing: 0.16em; text-transform: uppercase; color: var(--ink-faint); }
.tier h3 { font-size: 1.5rem; margin-top: 0.2rem; }
.tier ul { padding-left: 0; list-style: none; margin: 1rem 0 0; }
.tier li { color: var(--ink-dim); padding: 0.35rem 0; border-top: 1px solid var(--border); }
.tier li:first-child { border-top: none; }
.tier .privilege { color: var(--ink); font-weight: 600; }

/* ---------- Citation ---------- */
.quote {
  border-left: 3px solid var(--aurora-cyan);
  padding: 0.4rem 0 0.4rem 1.4rem;
  font-size: clamp(1.15rem, 2.4vw, 1.6rem);
  color: var(--ink);
  font-style: italic;
  max-width: 60ch;
}
.quote cite { display: block; font-style: normal; font-size: 0.95rem; color: var(--ink-faint); margin-top: 0.8rem; }

/* ---------- Bandeau ---------- */
.panel-feature {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: clamp(1.8rem, 4vw, 3rem);
}

/* ---------- Pied de page ---------- */
.site-footer {
  border-top: 1px solid var(--border);
  background: rgba(5, 6, 15, 0.6);
  padding: clamp(2.5rem, 5vw, 4rem) 0 2rem;
  margin-top: 2rem;
}
.footer-grid { display: grid; grid-template-columns: 2fr 1fr; gap: 2rem; }
.site-footer nav ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 0.4rem; }
.site-footer nav a { color: var(--ink-dim); }
.site-footer .legal {
  margin-top: 2rem;
  padding-top: 1.4rem;
  border-top: 1px solid var(--border);
  font-size: 0.85rem;
  color: var(--ink-faint);
}

/* ---------- Accessibilité ---------- */
:focus-visible { outline: 2px solid var(--aurora-cyan); outline-offset: 3px; border-radius: 6px; }
.skip-link {
  position: absolute; left: -9999px; top: 0;
  background: var(--aurora-cyan); color: #04121a; padding: 0.6rem 1rem; border-radius: 0 0 10px 0; z-index: 100;
}
.skip-link:focus { left: 0; }

/* ---------- FAQ (accordéons natifs) ---------- */
.faq-group { margin-top: 1rem; }
details.qa {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 14px;
  margin: 0.7rem 0;
  padding: 0 1.3rem;
}
details.qa[open] { background: var(--panel-2); }
details.qa summary {
  list-style: none;
  cursor: pointer;
  position: relative;
  padding: 1.1rem 2.2rem 1.1rem 0;
  font-weight: 600;
  color: var(--ink);
  font-size: 1.05rem;
}
details.qa summary::-webkit-details-marker { display: none; }
details.qa summary::after {
  content: "+";
  position: absolute; right: 0; top: 50%;
  transform: translateY(-50%);
  color: var(--aurora-teal);
  font-size: 1.5rem; line-height: 1; font-weight: 400;
  transition: transform 0.2s ease;
}
details.qa[open] summary::after { content: "\2212"; }
details.qa .answer {
  color: var(--ink-dim);
  padding: 0 0 1.3rem;
  max-width: 68ch;
}
details.qa .answer strong { color: var(--ink); }
details.qa .answer em { color: var(--aurora-teal); font-style: italic; }

/* ---------- Responsive ---------- */
@media (max-width: 820px) {
  .grid-3, .grid-2, .tiers, .footer-grid { grid-template-columns: 1fr; }

  .nav-toggle { display: inline-block; }
  .site-nav ul {
    position: absolute;
    top: 100%; left: 0; right: 0;
    flex-direction: column;
    gap: 0;
    background: rgba(5, 6, 15, 0.96);
    border-bottom: 1px solid var(--border);
    padding: 0.5rem;
    display: none;
  }
  .site-nav.open ul { display: flex; }
  .site-nav a { border-radius: 10px; }
}

@media (prefers-reduced-motion: reduce) {
  .aurora { animation: none; }
  html { scroll-behavior: auto; }
}