/* ============================================================
   04-NAV.css — BARRA DE NAVEGACIÓN + MONOGRAMA
   ============================================================
   Barra superior fija que aparece después de abrir la portada.
   Tiene el monograma del matrimonio (ej: K y C) a la izquierda
   y los links a las secciones a la derecha.
   ============================================================ */

.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(247, 243, 238, 0.35);
  backdrop-filter: blur(24px) saturate(160%);
  -webkit-backdrop-filter: blur(24px) saturate(160%);
  border-bottom: 1px solid rgba(217, 207, 193, 0.35);
  will-change: backdrop-filter;
  display: flex;
  align-items: center;
  padding: 0.6rem 1.8rem;
  gap: 1.5rem;
}

/* Franja difuminada que continúa el blur del nav y se desvanece hacia
   abajo, dando sensación de transición suave entre la barra y la página. */
.nav::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 100%;
  height: 28px;
  pointer-events: none;
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  background: linear-gradient(
    to bottom,
    rgba(247, 243, 238, 0.28) 0%,
    rgba(247, 243, 238, 0) 100%
  );
  mask-image: linear-gradient(to bottom, rgba(0,0,0,1) 0%, rgba(0,0,0,0) 100%);
  -webkit-mask-image: linear-gradient(to bottom, rgba(0,0,0,1) 0%, rgba(0,0,0,0) 100%);
}

.nav ul {
  display: flex;
  justify-content: center;
  gap: 1.4rem;
  list-style: none;
  flex-wrap: wrap;
  flex: 1;
}

.nav ul a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.8rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  transition: color 0.3s;
}
.nav ul a:hover { color: var(--accent); }

/* MONOGRAMA (ej: K y C) en la nav */
.nav__monogram {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  line-height: 0.95;
  color: var(--accent);
  text-decoration: none;
  flex-shrink: 0;
}
.nav__monogram-letter {
  font-family: var(--serif);
  font-weight: 400;
  font-size: 1.5rem;
  letter-spacing: 0.06em;
}
.nav__monogram-letter--bot {
  margin-left: 1.1rem;
}
.nav__monogram-amp {
  font-family: var(--script);
  font-size: 1.1rem;
  margin-left: 0.55rem;
  margin-top: 0.05rem;
  margin-bottom: 0.05rem;
}

/* ────────────────────────────────────────────────────────────
   BOTÓN HAMBURGUESA — visible solo en mobile
   ──────────────────────────────────────────────────────────── */
.nav__toggle {
  display: none;
  width: 38px;
  height: 38px;
  border: none;
  background: transparent;
  cursor: pointer;
  padding: 0;
  margin-left: auto;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  flex-shrink: 0;
  border-radius: 6px;
  transition: background 0.2s ease;
}
.nav__toggle:hover { background: rgba(176, 141, 87, 0.08); }
.nav__toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--accent);
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.2s ease;
}
.nav.is-open .nav__toggle span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav.is-open .nav__toggle span:nth-child(2) { opacity: 0; }
.nav.is-open .nav__toggle span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }


@media (max-width: 760px) {
  .nav { padding: 0.5rem 1rem; gap: 0.8rem; }
  .nav__monogram-letter { font-size: 1.25rem; }
  .nav__monogram-amp { font-size: 0.95rem; }

  /* El toggle aparece, los links se ocultan y bajan como dropdown. */
  .nav__toggle { display: flex; }

  .nav ul {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    background: rgba(247, 243, 238, 0.92);
    backdrop-filter: blur(20px) saturate(160%);
    -webkit-backdrop-filter: blur(20px) saturate(160%);
    padding: 0.4rem 1.5rem;
    gap: 0;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
    border-bottom: 1px solid rgba(217, 207, 193, 0.3);
    flex: none;
    flex-wrap: nowrap;
    transform: translateY(-12px);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.25s ease, opacity 0.25s ease;
  }
  .nav.is-open ul {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  .nav ul li {
    text-align: center;
    padding: 0.85rem 0;
    border-bottom: 1px solid rgba(217, 207, 193, 0.25);
  }
  .nav ul li:last-child { border-bottom: none; }
  .nav ul a { font-size: 0.85rem; }
}


/* BOTÓN FLOTANTE DE MÚSICA — aparece después de abrir la invitación */
.music-toggle {
  position: fixed;
  right: 1.2rem;
  bottom: 1.2rem;
  z-index: 50;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: none;
  background: var(--accent);
  color: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: 0 6px 18px rgba(0,0,0,0.18);
  transition: transform 0.2s ease, background 0.2s ease;
}
.music-toggle:hover { transform: scale(1.06); background: var(--ink); }
.music-toggle__icon--pause { display: none; }
.music-toggle.is-playing .music-toggle__icon--play { display: none; }
.music-toggle.is-playing .music-toggle__icon--pause { display: block; }