/*
  Piezas reutilizables: botones, navegación, chips, campos de formulario,
  lightbox, botón "volver arriba" y la utilidad de scroll-reveal.
  Nada de esto pertenece a una sola sección — si se usa en 2+ lugares, vive acá.
*/

/* ============ Botones ============ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 16px 30px;
  border-radius: var(--radius-pill);
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 15px;
  letter-spacing: .01em;
  cursor: pointer;
  border: 1px solid transparent;
  transition: transform var(--duration-fast) ease, background var(--duration-fast) ease, border-color var(--duration-fast) ease;
  white-space: nowrap;
}

.btn--primary {
  background: var(--color-purple);
  color: #fff;
}
.btn--primary:hover {
  background: var(--color-purple-light);
  transform: translateY(-2px);
}

.btn--outline {
  background: transparent;
  border-color: var(--color-gray);
  color: var(--color-ivory);
}
.btn--outline:hover {
  background: rgba(245, 242, 236, .08);
  border-color: var(--color-ivory);
}

.btn--outline-purple {
  background: var(--color-purple-wash-strong);
  border-color: var(--color-purple);
  color: var(--color-ivory);
}
.btn--outline-purple:hover {
  background: var(--color-purple);
}

.btn--block {
  display: flex;
  width: 100%;
  padding: 16px;
  border: none;
}

/* ============ Header / navegación ============ */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 80;
  background: rgba(18, 18, 22, 0);
  border-bottom: 1px solid rgba(185, 182, 194, 0);
  transition: background var(--duration-hero) ease, backdrop-filter var(--duration-hero) ease, border-color var(--duration-hero) ease;
}
.site-header.is-scrolled {
  background: rgba(18, 18, 22, .82);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom-color: rgba(185, 182, 194, .14);
}

.nav-bar {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 18px var(--section-pad-x);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--color-ivory);
}
/* El trazo del logo sobresale levemente de su viewBox por el grosor del
   stroke redondeado — sin esto el navegador lo recorta. */
.brand-mark {
  overflow: visible;
}
.brand__name {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: .14em;
  font-size: 16px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 34px;
}
.nav-links a {
  color: var(--color-ivory);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: .02em;
  opacity: .82;
  transition: opacity var(--duration-fast) ease;
}
.nav-links a:hover {
  opacity: 1;
  color: var(--color-ivory);
}

.nav-cta {
  padding: 13px 22px;
  font-size: 13px;
  letter-spacing: .04em;
}
.site-header.is-scrolled .nav-cta {
  background: var(--color-purple);
  border-color: var(--color-purple-light);
}

.burger {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 11px;
  color: var(--color-ivory);
}

.mobile-menu {
  display: none;
  flex-direction: column;
  gap: 4px;
  padding: 8px var(--section-pad-x) 28px;
  background: var(--color-black);
  border-top: 1px solid var(--color-border-soft);
}
.mobile-menu.is-open {
  display: flex;
}
.mobile-menu a {
  color: var(--color-ivory);
  font-size: 17px;
  font-weight: 600;
  padding: 12px 0;
  border-bottom: 1px solid rgba(185, 182, 194, .1);
}
.mobile-menu a:last-of-type {
  border-bottom: none;
}
.mobile-menu__cta {
  margin-top: 14px;
  text-align: center;
  padding: 14px;
  border-radius: var(--radius-pill);
  background: var(--color-purple);
  color: #fff;
  font-weight: 600;
}

/* ============ Chips (selector "¿Qué te interesa?") ============ */
.chip {
  padding: 10px 16px;
  border-radius: var(--radius-pill);
  font-size: 13px;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  border: 1px solid var(--color-border-faint);
  background: transparent;
  color: var(--color-gray);
  transition: all .2s ease;
}
.chip.is-active {
  border-color: var(--color-purple-light);
  background: var(--color-purple);
  color: #fff;
}

/* ============ Benefit pill ("Acompañamiento", "Progreso a tu ritmo"...) ============ */
.benefit-pill {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 20px 14px 16px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-border-softer);
  background: rgba(245, 242, 236, .03);
  font-weight: 600;
  font-size: 15px;
}
.benefit-pill__icon {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--color-purple-light-wash);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

/* ============ Campos de formulario ============ */
.field {
  display: block;
}
.field__label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .02em;
  color: var(--color-gray);
  margin-bottom: 8px;
}
.field__input {
  width: 100%;
  padding: 14px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border-faint);
  background: var(--color-black);
  color: var(--color-ivory);
  font-size: 15px;
  font-family: inherit;
  outline: none;
  transition: border-color var(--duration-fast) ease;
}
.field__input:focus {
  border-color: var(--color-purple-light);
}
textarea.field__input {
  resize: vertical;
}
.field__error {
  margin: 0;
  color: var(--color-error);
  font-size: 13px;
}

/* ============ Badge de etiqueta (trayectoria) ============ */
.tag-badge {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 11px;
  letter-spacing: .16em;
  font-weight: 600;
  color: var(--color-purple-light);
  padding: 5px 11px;
  border: 1px solid rgba(141, 132, 204, .4);
  border-radius: var(--radius-pill);
}

/* ============ Lightbox ============ */
.lightbox {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 120;
  background: rgba(10, 10, 13, .92);
  align-items: center;
  justify-content: center;
  padding: 5vw;
}
.lightbox.is-open {
  display: flex;
  animation: floatUp .3s ease;
}
.lightbox__img {
  max-width: 100%;
  max-height: 100%;
  border-radius: 12px;
  object-fit: contain;
  box-shadow: 0 30px 80px -30px rgba(0, 0, 0, .8);
}
.lightbox__close {
  position: fixed;
  top: 24px;
  right: 28px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: rgba(245, 242, 236, .12);
  border: 1px solid rgba(245, 242, 236, .3);
  color: #fff;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ============ Botón "volver arriba" ============ */
.back-to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 90;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  border: none;
  cursor: pointer;
  background: var(--color-purple);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-cta);
  opacity: 0;
  pointer-events: none;
  transform: translateY(10px);
  transition: opacity var(--duration-base) ease, transform var(--duration-fast) ease;
}
.back-to-top.is-visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

/* ============ Utilidad: aparición al hacer scroll ============ */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity var(--duration-reveal) ease, transform var(--duration-reveal) ease;
}
.reveal.is-visible {
  opacity: 1;
  transform: none;
}