/* ── NAV — fichier partagé, inclus sur toutes les pages ──
   Dépend des variables CSS déjà définies dans le :root de chaque page :
   --bg, --text, --text2, --accent, --surface, --border, --nav-bg, --card-shadow, --transition
*/

nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 999;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 40px;
  background: var(--nav-bg);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition);
}
.nav-logo {
  font-family: 'Fraunces', serif;
  font-size: 1.15rem;
  font-weight: 400;
  color: var(--text);
  letter-spacing: -0.02em;
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
}
.nav-logo-img { height: 32px; width: auto; display: block; }
.nav-logo span { color: var(--accent); font-style: italic; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}
.nav-links a {
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text2);
  text-decoration: none;
  transition: color 0.2s;
}
.nav-links a:hover { color: var(--accent); }

/* ── DROPDOWN NAV ── */
.nav-dropdown { position: relative; }
.nav-dropdown::after {
  content: '';
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  height: 14px; /* comble l'espace vide pour garder le survol actif */
}
.nav-dropdown > .nav-dropdown-trigger {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  cursor: pointer;
}
.nav-dropdown > .nav-dropdown-trigger::after {
  content: '';
  width: 6px; height: 6px;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: rotate(45deg);
  margin-top: -3px;
  transition: transform 0.2s;
}
.nav-dropdown:hover > .nav-dropdown-trigger::after { transform: rotate(225deg); margin-top: 3px; }

.nav-dropdown-menu {
  position: absolute;
  top: calc(100% + 14px);
  left: 50%;
  transform: translateX(-50%) translateY(-6px);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  box-shadow: var(--card-shadow);
  padding: 8px 0;
  min-width: 170px;
  list-style: none;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s, transform 0.2s;
}
.nav-dropdown:hover .nav-dropdown-menu {
  opacity: 1;
  pointer-events: all;
  transform: translateX(-50%) translateY(0);
}
.nav-dropdown-menu a {
  display: block;
  padding: 10px 20px;
  white-space: nowrap;
  text-transform: none;
  letter-spacing: 0.02em;
  font-size: 0.85rem;
}

/* ── THEME TOGGLE ── */
.toggle-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: 'DM Mono', monospace;
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  color: var(--text2);
  text-transform: uppercase;
}
.toggle-btn {
  position: relative;
  width: 44px; height: 24px;
  background: var(--bg2, var(--border));
  border: 1px solid var(--border);
  border-radius: 12px;
  cursor: pointer;
  transition: background var(--transition);
}
[data-theme="dark"] .toggle-btn { background: var(--accent); }
.toggle-btn::after {
  content: '';
  position: absolute;
  top: 2px; left: 2px;
  width: 18px; height: 18px;
  border-radius: 50%;
  background: #fff;
  transition: transform var(--transition);
}
[data-theme="dark"] .toggle-btn::after { transform: translateX(20px); }

/* ── BURGER (caché sur desktop) ── */
.nav-burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 32px;
  height: 32px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}
.nav-burger span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--text);
  transition: transform 0.3s ease, opacity 0.3s ease;
}
.nav-burger[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-burger[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-burger[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ── RESPONSIVE ── */
@media (max-width: 900px) {
  nav { padding: 14px 20px; }
  .nav-burger { display: flex; }

  /* Sous-menu "Démonstrations" en accordéon */
  .nav-dropdown-menu {
    position: static;
    transform: none;
    opacity: 1;
    pointer-events: all;
    box-shadow: none;
    border: none;
    background: rgba(0,0,0,0.03);
    padding: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
  }
  [data-theme="dark"] .nav-dropdown-menu { background: rgba(255,255,255,0.03); }
  .nav-dropdown.is-open .nav-dropdown-menu {
    max-height: 200px;
    padding: 4px 0 8px;
  }
  .nav-dropdown:hover .nav-dropdown-menu {
    transform: none;
  }
  .nav-dropdown-menu a {
    padding: 8px 24px;
    font-size: 0.75rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    font-family: 'DM Mono', monospace;
    color: var(--text2);
  }
  .nav-dropdown > .nav-dropdown-trigger::after { transition: transform 0.25s ease; }
  .nav-dropdown.is-open > .nav-dropdown-trigger::after {
    transform: rotate(225deg);
    margin-top: 3px;
  }

  .nav-links {
    position: fixed;
    top: 60px;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease;
  }
  @supports (backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px)) {
    .nav-links {
      background: color-mix(in srgb, var(--bg) 96%, transparent);
      -webkit-backdrop-filter: blur(16px);
      backdrop-filter: blur(16px);
    }
  }
  .nav-links.open {
    max-height: 400px;
  }
  .nav-links li {
    width: 100%;
    text-align: center;
  }
  .nav-links a {
    display: block;
    padding: 16px 24px;
  }
}