/* ═══════════════════════════════════════════════════════════
   NexxoIA — Crystal Liquid UI (nav, botones, flechas)
   ═══════════════════════════════════════════════════════════ */

:root {
  --crystal-teal: #14b8a6;
  --crystal-border-outer: rgba(255, 255, 255, 0.38);
  --crystal-border-inner: rgba(20, 184, 166, 0.55);
  --crystal-glass-dark: linear-gradient(
    145deg,
    rgba(255, 255, 255, 0.14) 0%,
    rgba(12, 28, 38, 0.82) 42%,
    rgba(6, 14, 22, 0.9) 100%
  );
  --crystal-glass-light: linear-gradient(
    145deg,
    rgba(255, 255, 255, 0.22) 0%,
    rgba(25, 45, 68, 0.78) 48%,
    rgba(15, 30, 50, 0.88) 100%
  );
  --crystal-shadow:
    0 0 0 1px var(--crystal-border-outer),
    0 0 0 2px var(--crystal-border-inner),
    0 10px 36px rgba(0, 0, 0, 0.38),
    inset 0 1px 0 rgba(255, 255, 255, 0.14);
  --crystal-shadow-hover:
    0 0 0 1px rgba(255, 255, 255, 0.48),
    0 0 0 2px rgba(20, 184, 166, 0.75),
    0 14px 42px rgba(0, 0, 0, 0.42),
    0 0 32px rgba(20, 184, 166, 0.22),
    inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

.nav-pill.crystal-nav {
  backdrop-filter: blur(22px) saturate(1.45);
  -webkit-backdrop-filter: blur(22px) saturate(1.45);
  background: var(--crystal-glass-dark) !important;
  border: none !important;
  box-shadow: var(--crystal-shadow) !important;
}

body.theme-dark .nav-pill.crystal-nav {
  background: var(--crystal-glass-light) !important;
  box-shadow:
    0 0 0 1px rgba(255, 255, 255, 0.42),
    0 0 0 2px rgba(79, 208, 197, 0.5),
    0 12px 40px rgba(0, 0, 0, 0.32),
    inset 0 1px 0 rgba(255, 255, 255, 0.16) !important;
}

.crystal-nav .nav-link.active {
  background: linear-gradient(155deg, rgba(20, 184, 166, 0.28) 0%, rgba(12, 28, 38, 0.65) 100%);
  box-shadow: 0 0 0 1px rgba(20, 184, 166, 0.35), inset 0 1px 0 rgba(255, 255, 255, 0.15);
}

.btn-dark,
a.btn-dark,
button.btn-dark,
.cf-btn,
.nav-overlay-cta {
  border: none !important;
  backdrop-filter: blur(12px) saturate(1.3);
  -webkit-backdrop-filter: blur(12px) saturate(1.3);
  background: linear-gradient(155deg, rgba(94, 234, 212, 0.95) 0%, rgba(20, 184, 166, 0.92) 38%, rgba(13, 148, 136, 0.96) 100%) !important;
  color: #042a24 !important;
  box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.45), 0 0 0 2px rgba(20, 184, 166, 0.55), 0 8px 28px rgba(20, 184, 166, 0.35), inset 0 1px 0 rgba(255, 255, 255, 0.45) !important;
}

.btn-dark:hover,
a.btn-dark:hover,
.cf-btn:hover:not(:disabled),
.nav-overlay-cta:hover {
  transform: translateY(-2px) scale(1.02) !important;
  box-shadow: var(--crystal-shadow-hover) !important;
}

.btn-outline,
a.btn-outline {
  border: none !important;
  backdrop-filter: blur(14px) saturate(1.25);
  background: linear-gradient(155deg, rgba(255, 255, 255, 0.12) 0%, rgba(10, 24, 32, 0.55) 100%) !important;
  color: #e2e8f0 !important;
  box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.28), 0 0 0 2px rgba(20, 184, 166, 0.32), 0 6px 22px rgba(0, 0, 0, 0.28) !important;
}

/* ── Flecha hero (siguiente sección) ── */
.section-nav-float--hero {
  position: absolute;
  left: 50%;
  bottom: 28px;
  transform: translateX(-50%);
  z-index: 200;
  pointer-events: none;
  filter: drop-shadow(0 8px 24px rgba(0, 0, 0, 0.55));
}

.section-nav-float--hero .nav-arrows {
  pointer-events: none;
}

.section-nav-float--hero .nav-arrows > * {
  pointer-events: auto;
}

.hero:has(.section-nav-float--hero) {
  overflow: visible !important;
}

/* ── Volver arriba (fija, esquina inferior derecha) ── */
a.back-to-top.crystal-arrow {
  position: fixed !important;
  left: auto !important;
  right: max(20px, env(safe-area-inset-right, 0px)) !important;
  bottom: max(28px, env(safe-area-inset-bottom, 0px)) !important;
  top: auto !important;
  z-index: 100002;
  display: inline-flex !important;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  margin: 0;
  text-decoration: none;
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  filter: drop-shadow(0 8px 28px rgba(0, 0, 0, 0.55));
  transition:
    opacity 0.28s ease,
    visibility 0.28s ease,
    transform 0.28s cubic-bezier(0.34, 1.2, 0.64, 1);
}

a.back-to-top.crystal-arrow:focus-visible {
  outline: 2px solid rgba(20, 184, 166, 0.85);
  outline-offset: 3px;
}

@media (max-width: 640px) {
  a.back-to-top.crystal-arrow {
    right: max(14px, env(safe-area-inset-right, 0px)) !important;
    bottom: max(20px, env(safe-area-inset-bottom, 0px)) !important;
    width: 48px;
    height: 48px;
  }
}

.nav-arrow.crystal-arrow,
a.back-to-top.crystal-arrow {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  border: none;
  backdrop-filter: blur(18px) saturate(1.5);
  -webkit-backdrop-filter: blur(18px) saturate(1.5);
  background:
    radial-gradient(140% 130% at 28% 16%, rgba(255, 255, 255, 0.75) 0%, transparent 50%),
    radial-gradient(90% 90% at 72% 88%, rgba(0, 0, 0, 0.2) 0%, transparent 55%),
    linear-gradient(155deg, rgba(240, 245, 250, 0.55) 0%, rgba(160, 175, 195, 0.4) 45%, rgba(90, 100, 120, 0.5) 100%) !important;
  color: #1e293b !important;
  box-shadow:
    0 0 0 1px rgba(255, 255, 255, 0.75),
    0 0 0 2px rgba(20, 184, 166, 0.65),
    0 0 24px rgba(20, 184, 166, 0.35),
    0 12px 36px rgba(0, 0, 0, 0.45),
    inset 0 2px 6px rgba(255, 255, 255, 0.65),
    inset 0 -6px 14px rgba(0, 0, 0, 0.15) !important;
  flex-shrink: 0;
}

.nav-arrow.crystal-arrow svg,
a.back-to-top.crystal-arrow svg {
  width: 22px;
  height: 22px;
  stroke-width: 2.25;
}

.nav-arrow.crystal-arrow:hover,
a.back-to-top.crystal-arrow:hover {
  transform: translateY(-3px) scale(1.06) !important;
  box-shadow:
    0 0 0 1px rgba(255, 255, 255, 0.65),
    0 0 0 2px rgba(20, 184, 166, 0.75),
    0 14px 38px rgba(0, 0, 0, 0.4),
    0 0 28px rgba(20, 184, 166, 0.28),
    inset 0 2px 5px rgba(255, 255, 255, 0.55) !important;
}

body.theme-dark .nav-arrow.crystal-arrow,
body.theme-dark a.back-to-top.crystal-arrow {
  background:
    radial-gradient(140% 130% at 28% 16%, rgba(255, 255, 255, 0.5) 0%, transparent 48%),
    linear-gradient(155deg, rgba(255, 255, 255, 0.28) 0%, rgba(160, 175, 195, 0.22) 50%, rgba(100, 115, 135, 0.32) 100%) !important;
  box-shadow:
    0 0 0 1px rgba(255, 255, 255, 0.5),
    0 0 0 2px rgba(79, 208, 197, 0.55),
    0 10px 30px rgba(0, 0, 0, 0.3),
    inset 0 2px 4px rgba(255, 255, 255, 0.45) !important;
}

/* Overlay móvil */
.nav-overlay-cta {
  letter-spacing: -0.01em;
}

.nav-overlay-link {
  border-radius: 100px;
  transition: background 0.22s ease, box-shadow 0.22s ease;
}

.nav-overlay-link:hover {
  box-shadow: inset 0 0 0 1px rgba(20, 184, 166, 0.25);
}