/* ==========================================================================
   Reusable components
   ========================================================================== */

/* --- Buttons ------------------------------------------------------------ */
.btn {
  --btn-fg: var(--navy-950);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.55em;
  padding: 0.9em 1.5em;
  border-radius: var(--r-pill);
  font-weight: 700;
  font-size: 0.92rem;
  letter-spacing: 0.01em;
  white-space: nowrap;
  transition: transform var(--dur-fast) var(--ease-out), box-shadow var(--dur-fast) var(--ease-out), background var(--dur-fast) var(--ease-out);
}

.btn:active {
  transform: scale(0.97);
}

.btn-gold {
  background: linear-gradient(180deg, var(--gold-300), var(--gold-500));
  color: var(--btn-fg);
  box-shadow: var(--shadow-gold);
}

.btn-gold:hover {
  box-shadow: 0 14px 34px -8px rgba(205, 161, 83, 0.5);
  transform: translateY(-2px);
}

.btn-ghost {
  background: transparent;
  color: var(--text-1);
  border: 1px solid var(--navy-line);
}

.section-light .btn-ghost {
  color: var(--paper-ink-1);
  border-color: var(--paper-line);
}

.btn-ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.btn-whatsapp {
  background: var(--whatsapp);
  color: #f7fff9;
}

.btn-whatsapp:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 28px -10px rgba(47, 191, 109, 0.55);
}

.btn-block {
  width: 100%;
}

.btn-sm {
  padding: 0.7em 1.15em;
  font-size: 0.82rem;
}

/* --- Badges / chips ------------------------------------------------------ */
.chip {
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  padding: 0.45em 0.9em;
  border-radius: var(--r-pill);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  background: var(--navy-800);
  border: 1px solid var(--navy-line);
  color: var(--text-2);
}

.section-light .chip {
  background: var(--paper-raised);
  border-color: var(--paper-line);
  color: var(--paper-ink-2);
}

.chip-gold {
  background: rgba(230, 196, 121, 0.12);
  border-color: rgba(230, 196, 121, 0.35);
  color: var(--gold-300);
}

/* --- Site header / nav --------------------------------------------------- */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 90;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  transition: background var(--dur-med) var(--ease-out), box-shadow var(--dur-med) var(--ease-out), height var(--dur-med) var(--ease-out), border-color var(--dur-med) var(--ease-out);
  border-bottom: 1px solid transparent;
}

.site-header.is-scrolled {
  background: rgba(7, 11, 19, 0.82);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  border-bottom-color: var(--navy-line);
  box-shadow: 0 8px 30px -14px rgba(0, 0, 0, 0.6);
}

.nav-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-4);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.02rem;
  letter-spacing: 0.01em;
}

.brand img {
  width: 34px;
  height: 34px;
}

.brand small {
  display: block;
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 0.58rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-3);
}

.nav-links {
  display: none;
  align-items: center;
  gap: var(--sp-6);
  font-size: 0.86rem;
  font-weight: 500;
  color: var(--text-2);
}

@media (min-width: 1024px) {
  .nav-links {
    display: flex;
  }
}

.nav-links a {
  position: relative;
  padding-block: 0.3rem;
}

.nav-links a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 100%;
  bottom: 0;
  height: 1px;
  background: var(--accent);
  transition: right var(--dur-fast) var(--ease-out);
}

.nav-links a:hover {
  color: var(--text-1);
}

.nav-links a:hover::after {
  right: 0;
}

.nav-cta {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.nav-cta .btn {
  display: none;
}

@media (min-width: 640px) {
  .nav-cta .btn {
    display: inline-flex;
  }
}

.nav-toggle {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: var(--r-sm);
  border: 1px solid var(--navy-line);
}

@media (min-width: 1024px) {
  .nav-toggle {
    display: none;
  }
}

.nav-toggle span,
.nav-toggle span::before,
.nav-toggle span::after {
  content: "";
  display: block;
  width: 18px;
  height: 1.5px;
  background: var(--text-1);
  position: relative;
  transition: transform var(--dur-fast) var(--ease-out), opacity var(--dur-fast) var(--ease-out);
}

.nav-toggle span::before {
  position: absolute;
  top: -6px;
}

.nav-toggle span::after {
  position: absolute;
  top: 6px;
}

.nav-toggle[aria-expanded="true"] span {
  background: transparent;
}

.nav-toggle[aria-expanded="true"] span::before {
  top: 0;
  transform: rotate(45deg);
}

.nav-toggle[aria-expanded="true"] span::after {
  top: 0;
  transform: rotate(-45deg);
}

/* --- Mobile menu overlay -------------------------------------------------- */
.mobile-menu {
  position: fixed;
  inset: 0;
  z-index: 85;
  background: var(--navy-950);
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: var(--sp-6);
  padding: var(--sp-6);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: opacity var(--dur-med) var(--ease-out), visibility var(--dur-med) var(--ease-out), transform var(--dur-med) var(--ease-out);
}

.mobile-menu.is-open {
  opacity: 1;
  visibility: visible;
  transform: none;
}

.mobile-menu > a {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 6vw, 2.1rem);
  font-weight: 500;
  color: var(--text-1);
}

.mobile-menu-foot {
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
  padding-top: var(--sp-5);
  border-top: 1px solid var(--navy-line);
}

.mobile-menu-social {
  display: flex;
  gap: var(--sp-4);
  font-size: 0.8rem;
  color: var(--text-3);
}

/* --- Cards ---------------------------------------------------------------- */
.card {
  background: var(--navy-900);
  border: 1px solid var(--navy-line);
  border-radius: var(--r-lg);
  padding: var(--sp-5);
}

.section-light .card {
  background: var(--paper-raised);
  border-color: var(--paper-line);
}

/* --- Accordion (FAQ + módulos) --------------------------------------------- */
.accordion-item {
  border-bottom: 1px solid var(--navy-line);
}

.section-light .accordion-item {
  border-color: var(--paper-line);
}

.accordion-trigger {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-4);
  padding-block: var(--sp-4);
  text-align: left;
  font-family: var(--font-display);
  font-size: clamp(0.95rem, 0.88rem + 0.3vw, 1.15rem);
  font-weight: 500;
}

.accordion-icon {
  flex: none;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  border: 1px solid var(--navy-line);
  display: grid;
  place-items: center;
  transition: transform var(--dur-fast) var(--ease-out), background var(--dur-fast) var(--ease-out);
}

.section-light .accordion-icon {
  border-color: var(--paper-line);
}

.accordion-icon svg {
  width: 11px;
  height: 11px;
  transition: transform var(--dur-fast) var(--ease-out);
}

.accordion-icon svg .v {
  transition: opacity var(--dur-fast) var(--ease-out);
}

.accordion-item.is-open .accordion-icon {
  background: var(--gold-400);
  border-color: var(--gold-400);
}

.accordion-item.is-open .accordion-icon svg {
  stroke: var(--navy-950);
}

.accordion-item.is-open .accordion-icon .v {
  opacity: 0;
}

.accordion-panel {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows var(--dur-med) var(--ease-out);
}

.accordion-item.is-open .accordion-panel {
  grid-template-rows: 1fr;
}

.accordion-panel-inner {
  overflow: hidden;
}

.accordion-body {
  padding-bottom: var(--sp-4);
  color: var(--text-2);
  font-size: 0.92rem;
  max-width: 46rem;
}

.section-light .accordion-body {
  color: var(--paper-ink-2);
}

/* --- Tabs (módulos académicos) --------------------------------------------- */
.tabs-nav {
  display: flex;
  gap: 0.4rem;
  overflow-x: auto;
  scrollbar-width: none;
  padding-bottom: 0.3rem;
  -webkit-overflow-scrolling: touch;
}

.tabs-nav::-webkit-scrollbar {
  display: none;
}

.tab-btn {
  flex: none;
  padding: 0.6em 1.05em;
  border-radius: var(--r-pill);
  font-size: 0.78rem;
  font-weight: 600;
  border: 1px solid var(--navy-line);
  color: var(--text-3);
  transition: all var(--dur-fast) var(--ease-out);
}

.tab-btn.is-active {
  background: var(--gold-400);
  border-color: var(--gold-400);
  color: var(--navy-950);
}

.section-light .tab-btn {
  border-color: var(--paper-line);
  color: var(--paper-ink-3);
}

.section-light .tab-btn.is-active {
  border-color: var(--gold-500);
  color: var(--navy-950);
}

.tab-panel {
  display: none;
}

.tab-panel.is-active {
  display: block;
}

/* --- Modal / Lightbox -------------------------------------------------- */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: grid;
  place-items: center;
  padding: var(--sp-5);
  background: rgba(5, 8, 14, 0.92);
  backdrop-filter: blur(6px);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--dur-med) var(--ease-out), visibility var(--dur-med) var(--ease-out);
}

.lightbox.is-open {
  opacity: 1;
  visibility: visible;
}

.lightbox img {
  max-height: 86dvh;
  width: auto;
  border-radius: var(--r-md);
  box-shadow: var(--shadow-2);
  transform: scale(0.94);
  transition: transform var(--dur-med) var(--ease-out);
}

.lightbox.is-open img {
  transform: scale(1);
}

.lightbox-close {
  position: absolute;
  top: var(--sp-5);
  right: var(--sp-5);
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.2);
  display: grid;
  place-items: center;
  color: var(--text-1);
}

/* --- Forms ---------------------------------------------------------------- */
.field {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.field label {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-3);
}

.field input,
.field select {
  background: var(--navy-950);
  border: 1px solid var(--navy-line);
  border-radius: var(--r-sm);
  padding: 0.85em 1em;
  color: var(--text-1);
  font-size: 0.95rem;
  transition: border-color var(--dur-fast) var(--ease-out);
}

.field input::placeholder {
  color: var(--text-3);
}

.field input:focus,
.field select:focus {
  border-color: var(--accent);
}

.field-error {
  font-size: 0.74rem;
  color: var(--danger);
  min-height: 1em;
}

.field.has-error input,
.field.has-error select {
  border-color: var(--danger);
}

.form-note {
  font-size: 0.76rem;
  color: var(--text-3);
}

.form-success {
  display: none;
  text-align: center;
  padding: var(--sp-6) var(--sp-4);
}

.form-success.is-active {
  display: block;
}

/* --- WhatsApp FAB ------------------------------------------------------- */
.fab-whatsapp {
  position: fixed;
  right: clamp(1rem, 3vw, 1.75rem);
  bottom: clamp(1rem, 3vw, 1.75rem);
  z-index: 80;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.85rem;
  border-radius: var(--r-pill);
  background: var(--whatsapp);
  color: #f7fff9;
  box-shadow: 0 12px 28px -8px rgba(47, 191, 109, 0.55);
  transition: transform var(--dur-fast) var(--ease-out), padding var(--dur-med) var(--ease-out);
}

.fab-whatsapp svg {
  width: 24px;
  height: 24px;
  flex: none;
}

.fab-whatsapp span {
  max-width: 0;
  overflow: hidden;
  white-space: nowrap;
  font-size: 0.82rem;
  font-weight: 700;
  transition: max-width var(--dur-med) var(--ease-out);
}

@media (min-width: 1024px) {
  .fab-whatsapp:hover span {
    max-width: 12rem;
  }
}

.fab-whatsapp:active {
  transform: scale(0.94);
}

/* --- Progress rail (scroll indicator) ------------------------------------ */
.scroll-rail {
  position: fixed;
  top: 0;
  left: 0;
  height: 2px;
  width: 100%;
  z-index: 95;
  background: transparent;
}

.scroll-rail-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--gold-500), var(--gold-300));
}