/* ─────────── Nav ─────────── */
.site-header {
  position: fixed;
  inset: 1rem 0 auto;
  z-index: 100;
  padding-inline: 1.25rem;
  pointer-events: none;
  transition: inset 0.35s var(--ease);
}

.site-header.is-scrolled { inset: 0.55rem 0 auto; }

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  max-width: calc(var(--container) + 2rem);
  padding: 0.5rem 0.5rem 0.5rem 1.35rem;
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: 999px;
  box-shadow: var(--shadow-md);
  backdrop-filter: blur(18px) saturate(1.5);
  -webkit-backdrop-filter: blur(18px) saturate(1.5);
  pointer-events: auto;
  transition: background 0.35s var(--ease), border-color 0.35s var(--ease);
}

/* Nav clara sobre o hero escuro (topo da página) */
.site-header:not(.is-scrolled) .container {
  background: rgba(8, 37, 47, 0.42);
  border-color: rgba(255, 255, 255, 0.16);
}
.site-header:not(.is-scrolled) .nav-logo { color: #fff; }
.site-header:not(.is-scrolled) .nav-logo span { color: var(--aqua-soft); }
.site-header:not(.is-scrolled) .nav-menu > li > a { color: rgba(255, 255, 255, 0.82); }
.site-header:not(.is-scrolled) .nav-menu > li > a:hover { color: #fff; background: rgba(255, 255, 255, 0.12); }
.site-header:not(.is-scrolled) .nav-menu > li > a.is-active {
  color: var(--teal-deep);
  background: rgba(255, 255, 255, 0.94);
}
.site-header:not(.is-scrolled) .nav-toggle span { background: #fff; }

.nav-logo {
  font-family: var(--font-heading);
  font-size: 0.95rem;
  font-weight: 800;
  color: var(--teal-dark);
  letter-spacing: -0.02em;
  white-space: nowrap;
  transition: color 0.35s var(--ease);
}

.nav-logo span { color: var(--teal); transition: color 0.35s var(--ease); }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 2.6rem; height: 2.6rem;
  padding: 0; border: none;
  background: transparent;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 100%; height: 2px;
  background: var(--teal-deep);
  border-radius: 2px;
  transition: transform 0.3s var(--ease), opacity 0.3s var(--ease), background 0.3s;
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.nav-menu {
  display: flex;
  align-items: center;
  gap: 0.15rem;
  list-style: none;
  margin: 0; padding: 0;
}

.nav-menu > li > a {
  display: block;
  padding: 0.5rem 0.9rem;
  font-family: var(--font-heading);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--ink-soft);
  border-radius: 999px;
  transition: color 0.2s, background 0.2s;
}

.nav-menu > li > a:hover,
.nav-menu > li > a.is-active {
  color: var(--teal-deep);
  background: rgba(236, 244, 246, 0.9);
}

.nav-cta {
  margin-left: 0.4rem;
  padding: 0.55rem 1.15rem !important;
  font-weight: 700 !important;
  color: var(--paper) !important;
  background: var(--grad-brand) !important;
  box-shadow: 0 6px 18px rgba(11, 58, 71, 0.28);
}
.nav-cta:hover { color: var(--paper) !important; filter: brightness(1.08); }
.site-header:not(.is-scrolled) .nav-cta { color: var(--paper) !important; }

main { padding-top: 0; }

/* ─────────── Section shells ─────────── */
.section { padding-block: var(--section-pad); position: relative; }
.section--tint { background: linear-gradient(180deg, var(--surface) 0%, var(--tint) 100%); }

.section--dark {
  background: var(--night);
  color: rgba(255, 255, 255, 0.78);
  position: relative;
  overflow: hidden;
}
.section--dark .container { position: relative; z-index: 2; }

.dark-bg { position: absolute; inset: 0; z-index: 0; pointer-events: none; overflow: hidden; }

/* ─────────── Responsivo ─────────── */
@media (max-width: 900px) {
  .site-header { inset: 0 0 auto; padding-inline: 0; }
  .site-header.is-scrolled { inset: 0 0 auto; }
  .site-header .container {
    border-radius: 0;
    border-inline: none; border-top: none;
    padding: 0.7rem 1.25rem;
    background: rgba(8, 37, 47, 0.62);
    border-color: rgba(255,255,255,0.12);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
  }
  .site-header .nav-logo { color: #fff; }
  .site-header .nav-logo span { color: var(--aqua-soft); }

  .nav-toggle { display: flex; }
  .nav-toggle span { background: #fff; }

  .nav-menu {
    position: fixed;
    inset: 56px 0 auto;
    flex-direction: column;
    align-items: stretch;
    padding: 1rem 1.25rem 1.5rem;
    background: rgba(5, 26, 34, 0.97);
    backdrop-filter: blur(14px);
    transform: translateY(-115%);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.35s var(--ease), opacity 0.35s var(--ease);
  }
  .nav-menu.is-open { transform: translateY(0); opacity: 1; pointer-events: auto; }
  .nav-menu > li > a { padding: 0.8rem 1rem; border-radius: var(--radius-sm); color: rgba(255,255,255,0.85); }
  .nav-menu > li > a:hover { background: rgba(255,255,255,0.08); color: #fff; }
  .nav-menu > li > a.is-active { color: #fff; background: rgba(255, 255, 255, 0.14); }
  .nav-cta { margin-left: 0; margin-top: 0.5rem; text-align: center; }
}

@media (max-width: 600px) {
  .container { width: min(var(--container), calc(100% - 2rem)); }
}