/* ==========================================================================
   layout.css — Navegación global, contenedores, grillas, paneles y pestañas
   ========================================================================== */

/* ---------- Navbar global y mega menú curricular ---------- */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  isolation: isolate;
  overflow: visible;
  background: color-mix(in srgb, var(--bg) 94%, transparent);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid color-mix(in srgb, var(--line, var(--border)) 72%, transparent);
}

.site-nav__bar {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: max-content minmax(0, 1fr) max-content;
  align-items: center;
  gap: 18px;
  width: min(100% - 32px, 1600px);
  min-height: 64px;
  margin: 0 auto;
  box-sizing: border-box;
}

.site-nav__left,
.site-nav__center,
.site-nav__right {
  display: flex;
  align-items: center;
  min-width: 0;
}

.site-nav__left {
  gap: 14px;
}

.site-nav__center {
  gap: 12px;
}

.site-nav__right {
  justify-content: flex-end;
}

.site-nav__brand {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  color: var(--ink);
  font-family: var(--font-math);
  font-size: 0.96rem;
  font-weight: 700;
  font-style: italic;
  letter-spacing: 0.25px;
  text-decoration: none;
  white-space: nowrap;
}

.site-nav__brand:hover {
  color: var(--yellow);
}

.site-nav__explore {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 42px;
  padding: 0 12px;
  border: 1px solid color-mix(in srgb, var(--yellow) 64%, var(--line, var(--border)));
  border-radius: 10px;
  background: color-mix(in srgb, var(--yellow) 8%, var(--surface, var(--bg)));
  color: var(--ink);
  font: 700 0.9rem var(--font-hand);
  white-space: nowrap;
  cursor: pointer;
  transition: background 160ms ease, border-color 160ms ease;
}

.site-nav__explore:hover,
.site-nav.is-drawer-open .site-nav__explore {
  background: color-mix(in srgb, var(--yellow) 16%, var(--surface, var(--bg)));
  border-color: var(--yellow);
}

.site-nav__explore-icon {
  flex: 0 0 auto;
}

.site-nav__explore-caret {
  color: var(--yellow);
  transition: transform 160ms ease;
}

.site-nav.is-drawer-open .site-nav__explore-caret {
  transform: rotate(180deg);
}

.site-nav__context {
  flex: 0 0 auto;
  padding: 6px 9px;
  border: 1px solid color-mix(in srgb, var(--blue) 45%, var(--line, var(--border)));
  border-radius: 999px;
  color: var(--blue);
  font: 700 0.78rem var(--font-hand);
  white-space: nowrap;
}

.site-nav__sound-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-height: 38px;
  padding: 0 10px;
  border: 1px solid var(--line, var(--border));
  border-radius: 9px;
  color: var(--ink);
  background: var(--surface, var(--bg));
  cursor: pointer;
}

.site-nav__backdrop {
  position: fixed;
  z-index: 99;
  inset: 0;
  display: block;
  width: 100%;
  height: 100%;
  padding: 0;
  border: 0;
  border-image: none;
  appearance: none;
  background: rgba(5, 10, 7, 0.62);
  opacity: 0;
  visibility: hidden;
  cursor: default;
  transition: opacity 180ms ease, visibility 180ms ease;
}

.site-nav__backdrop.is-visible {
  opacity: 1;
  visibility: visible;
}

.site-nav__drawer {
  position: absolute;
  z-index: 3;
  top: calc(100% + 10px);
  left: 50%;
  width: min(1320px, calc(100vw - 28px));
  max-height: calc(100vh - 78px);
  overflow-y: auto;
  padding: clamp(16px, 2vw, 26px);
  border: 1px solid color-mix(in srgb, var(--yellow) 54%, var(--line, var(--border)));
  border-radius: 16px;
  background: var(--surface, var(--bg));
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.55);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translate(-50%, -8px);
  transition: opacity 180ms ease, transform 180ms ease, visibility 180ms ease;
  scrollbar-width: thin;
  box-sizing: border-box;
}

.site-nav.is-drawer-open .site-nav__drawer {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translate(-50%, 0);
}

.site-nav__drawer-header {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 18px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line, var(--border));
}

.site-nav__drawer-kicker {
  margin: 0 0 3px;
  color: var(--yellow);
  font: 700 0.82rem var(--font-hand);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.site-nav__drawer-header h2 {
  margin: 0;
  color: var(--ink);
  font: 700 clamp(1.15rem, 2vw, 1.6rem) var(--font-hand);
}

.site-nav__drawer-count {
  margin: 0;
  color: var(--muted);
  font-size: 0.85rem;
  text-align: right;
}

.curriculum-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  align-items: stretch;
  gap: 14px;
}

.curriculum-card {
  min-width: 0;
  padding: 15px;
  border: 1px solid color-mix(in srgb, var(--green) 38%, var(--line, var(--border)));
  border-radius: 12px;
  background: color-mix(in srgb, var(--green) 5%, var(--bg));
}

.curriculum-card--soon {
  border-style: dashed;
  border-color: color-mix(in srgb, var(--yellow) 52%, var(--line, var(--border)));
  background: color-mix(in srgb, var(--yellow) 3%, var(--bg));
}

.curriculum-card__eyebrow,
.curriculum-card__link-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.curriculum-card__number {
  color: var(--muted);
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.curriculum-card__status {
  flex: 0 0 auto;
  padding: 3px 7px;
  border-radius: 999px;
  font-size: 0.68rem;
  font-weight: 700;
}

.curriculum-card__status.is-available {
  color: var(--green);
  background: color-mix(in srgb, var(--green) 13%, transparent);
}

.curriculum-card__status.is-soon {
  border: 1px dashed color-mix(in srgb, var(--yellow) 62%, transparent);
  color: var(--yellow);
}

.curriculum-card__title {
  margin: 9px 0 5px;
  color: var(--ink);
  font: 700 1.2rem/1.15 var(--font-hand);
}

.curriculum-card__subtitle {
  margin: 0;
  color: var(--muted);
  font-size: 0.78rem;
  line-height: 1.45;
}

.curriculum-card__links,
.curriculum-card__concepts {
  display: grid;
  gap: 5px;
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
}

.curriculum-card__link {
  display: grid;
  gap: 2px;
  padding: 7px 8px;
  border-radius: 8px;
  color: var(--ink);
  text-decoration: none;
  transition: background 150ms ease;
}

.curriculum-card__link:hover,
.curriculum-card__link.is-active {
  background: color-mix(in srgb, var(--blue) 13%, transparent);
}

.curriculum-card__link-heading strong {
  font-size: 0.8rem;
}

.curriculum-card__here {
  flex: 0 0 auto;
  color: var(--green);
  font: 700 0.7rem var(--font-hand);
}

.curriculum-card__detail {
  color: var(--muted);
  font-size: 0.72rem;
  line-height: 1.35;
}

.curriculum-card__concepts li {
  position: relative;
  padding-left: 13px;
  color: var(--muted);
  font-size: 0.76rem;
  line-height: 1.4;
}

.curriculum-card__concepts li::before {
  position: absolute;
  left: 0;
  color: var(--yellow);
  content: '·';
  font-weight: 900;
}

.site-nav__drawer a:focus-visible,
.site-nav__explore:focus-visible,
.site-nav__sound-btn:focus-visible {
  outline: 2px solid var(--yellow);
  outline-offset: 2px;
}

@media (max-width: 1080px) {
  .site-nav__bar {
    grid-template-columns: max-content minmax(0, 1fr) max-content;
    gap: 10px;
  }

  .site-nav__center {
    gap: 8px;
  }

  .curriculum-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 760px) {
  .site-nav__bar {
    grid-template-columns: minmax(0, 1fr) max-content;
    grid-template-areas:
      'left right'
      'center center';
    gap: 4px 10px;
    width: calc(100% - 20px);
    padding: 5px 0 7px;
  }

  .site-nav__left { grid-area: left; gap: 9px; }
  .site-nav__center { grid-area: center; width: 100%; }
  .site-nav__right { grid-area: right; }

  .site-nav__brand {
    min-height: 38px;
    font-size: 0.83rem;
  }

  .site-nav__explore {
    min-height: 36px;
    gap: 5px;
    padding: 0 8px;
    font-size: 0.78rem;
  }

  .site-nav__drawer {
    top: calc(100% + 6px);
    width: calc(100vw - 16px);
    max-height: calc(100vh - 92px);
    padding: 14px;
    border-radius: 12px;
  }

  .site-nav__drawer-header {
    align-items: start;
    flex-direction: column;
    gap: 6px;
    margin-bottom: 12px;
    padding-bottom: 12px;
  }

  .site-nav__drawer-count { text-align: left; }
}

@media (max-width: 560px) {
  .curriculum-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .curriculum-card {
    padding: 13px;
  }
}

@media (max-width: 360px) {
  .site-nav__bar {
    width: calc(100% - 12px);
  }

  .site-nav__left {
    gap: 5px;
  }

  .site-nav__brand {
    font-size: 0.7rem;
  }

  .site-nav__explore {
    gap: 4px;
    padding: 0 6px;
    font-size: 0.7rem;
  }
}

/* ---------- Contenedores ---------- */
.page {
  max-width: 67.5rem;
  width: calc(100% - 2rem);
  margin: 0 auto;
  padding: 1.75rem 1rem 3.5rem;
  box-sizing: border-box;
}

@media (max-width: 820px) {
  .page {
    width: 100%;
    max-width: 100%;
    padding: 1.25rem 1rem 2.5rem;
  }
}

.intro,
p.intro,
.page-header p {
  max-width: 36rem;
}

.page--narrow {
  max-width: 67.5rem;
}

.page--wide {
  max-width: 67.5rem;
}

.row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 12px;
  margin: 0 0 12px;
}

.stack {
  display: grid;
  gap: 12px;
}

.grid-auto {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(var(--min, 220px), 1fr));
  gap: 12px;
  margin: 0 0 12px;
}

.grid-auto--sm {
  --min: 140px;
}

.grid-auto--lg {
  --min: 280px;
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr);
  gap: 16px;
  align-items: start;
}

@media (max-width: 760px) {
  .split {
    grid-template-columns: 1fr;
  }
}

.panel {
  padding: 0;
  border-radius: 0;
  background: transparent;
  border: none;
  margin: 0 0 24px;
}

.panel--card {
  background: transparent;
  border: none;
}

.panel__label {
  font-size: 1rem;
  color: var(--muted);
  margin: 0 0 6px;
}

.section-divider {
  margin-top: 48px;
  padding-top: 0;
  border-top: none;
}

/* ---------- Pestañas (tabs) ---------- */
.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  border-bottom: none;
  margin: 0 0 16px;
  position: relative;
}

@media (max-width: 820px) {
  .tabs {
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    padding: 4px 16px;
    gap: 12px;
    margin: 0 0 20px;
    mask-image: linear-gradient(to right, transparent, black 24px, black calc(100% - 24px), transparent 100%);
    -webkit-mask-image: linear-gradient(to right, transparent, black 24px, black calc(100% - 24px), transparent 100%);
  }

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

  .tab {
    flex: 0 0 auto;
    white-space: nowrap;
  }
}

.tab {
  font: inherit;
  font-size: 1rem;
  color: var(--muted);
  background: transparent;
  border: 0;
  border-image: none;
  min-height: 44px;
  padding: 8px 12px;
  cursor: pointer;
  margin-bottom: -1px;
  border-radius: 0;
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-sizing: border-box;
  text-decoration: none;
  transition: color .15s;
}

@media (hover: hover) {
  .tab:hover {
    color: var(--ink);
    background: transparent;
  }
}

.tab[aria-selected="true"],
.tab.tab-active {
  color: var(--ink);
  font-weight: 600;
  background: transparent;
  border: 0;
  border-image: none;
}

.tab[aria-selected="true"]::after,
.tab.tab-active::after {
  content: "";
  position: absolute;
  left: 10px;
  right: 10px;
  bottom: 2px;
  height: 5px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 6' width='16' height='6'%3E%3Cpath d='M0 3 Q 4 0.5, 8 3 T 16 3' fill='none' stroke='%237ba7c2' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: repeat-x;
  background-size: 16px 6px;
  pointer-events: none;
}

.tab:focus-visible {
  outline: 2px solid var(--yellow);
  outline-offset: 3px;
}

.tab__num {
  display: inline;
  margin-right: 6px;
  background: transparent;
  color: var(--muted);
  font-size: 1rem;
  font-weight: 600;
}

.tab[aria-selected="true"] .tab__num,
.tab.tab-active .tab__num {
  background: transparent;
  color: var(--blue);
}

.tabpanel:focus-visible {
  outline: none;
}

/* ---------- Hub (Índice Manuscrito de Pizarra) ---------- */
.hub-index {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  margin-top: 36px;
}

@media (min-width: 900px) {
  .hub-index {
    grid-template-columns: repeat(2, 1fr);
    gap: 40px 48px;
  }
}

.hub-entry {
  display: grid;
  grid-template-columns: 68px 1fr;
  gap: 16px 20px;
  align-items: start;
  text-decoration: none;
  color: var(--ink);
  background: transparent;
  border: none;
  padding: 8px 10px;
  border-radius: 4px;
  transition: transform 0.15s, opacity 0.15s;
}

@media (hover: hover) {
  .hub-entry:hover {
    transform: translateY(-2px);
  }
  .hub-entry:hover .hub-entry__title {
    color: var(--yellow);
  }
}

.hub-entry:focus-visible {
  outline: 2px solid var(--yellow);
  outline-offset: 4px;
}

.hub-entry__doodle {
  width: 64px;
  height: 64px;
  flex: none;
  color: var(--ink);
  overflow: visible;
  transition: transform 0.2s;
}

.hub-entry:hover .hub-entry__doodle {
  transform: rotate(-3deg) scale(1.05);
}

.hub-entry__body {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.hub-entry__title-wrap {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.hub-entry__title {
  font-family: var(--font-hand);
  font-size: 1.85rem;
  font-weight: 700;
  line-height: 1.2;
  color: var(--ink);
  margin: 0;
  transition: color 0.15s;
}

.hub-entry__desc {
  font-family: var(--font-note);
  font-size: 1.125rem;
  line-height: 1.5;
  color: var(--muted);
  margin: 0;
}

.hub-badge-new {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  color: var(--yellow);
  transform: rotate(-3deg);
}

.hub-badge-text {
  font-family: var(--font-hand);
  font-size: 1.35rem;
  font-weight: 700;
  line-height: 1;
}

.hub-badge-arrow {
  width: 28px;
  height: 16px;
  overflow: visible;
}

/* ---------- Repisa de Pizarra (Sill / Tray) ---------- */
.chalk-sill {
  display: none;
}

@media (min-width: 820px) {
  .chalk-sill {
    display: block;
    width: 100%;
    max-width: 67.5rem;
    margin: auto auto 0;
    padding: 0 1rem;
    box-sizing: border-box;
    pointer-events: none;
  }

  .chalk-sill__rail {
    height: 6px;
    background: #6b6050;
    border-radius: 2px;
    display: flex;
    justify-content: flex-end;
    align-items: flex-end;
    padding-right: 4rem;
  }

  .chalk-sill__chalk {
    width: 2rem;
    height: 0.55rem;
    pointer-events: none;
    margin-bottom: 2px;
  }
}