/* Cerberus · estructura: barra lateral, contenido, encabezados y secciones. */

.shell {
  display: grid;
  grid-template-columns: var(--rail-width) minmax(0, 1fr);
  min-height: 100vh;
}

/* ── Barra lateral (228 px, como en el escritorio) ── */
.rail {
  position: sticky;
  top: 0;
  display: flex;
  flex-direction: column;
  height: 100vh;
  padding: 1.75rem var(--space-ml) var(--space-l);
  overflow-y: auto;
  background: var(--surface);
  border-right: 1px solid var(--line);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  color: var(--text);
  text-decoration: none;
}

.brand:hover {
  color: var(--text);
}

.brand__word {
  font-size: var(--size-brand);
  font-weight: var(--weight-medium);
  letter-spacing: var(--tracking-brand);
  line-height: 1;
}

.logo {
  flex: none;
  width: 1.75rem;
  height: 1.75rem;
}

.logo__tile {
  fill: var(--logo-tile);
  stroke: var(--logo-line);
}

.logo__c {
  stroke: #ee7f45;
}

.rail__nav {
  display: grid;
  gap: var(--space-xs);
  margin-top: 2rem;
}

.rail__label {
  margin: var(--space-l) var(--space-sm) var(--space-s);
  color: var(--text-3);
  font-size: var(--size-section);
  font-weight: var(--weight-strong);
  letter-spacing: var(--tracking-section);
  text-transform: uppercase;
}

.rail__projects {
  display: grid;
  gap: var(--space-xs);
}

.nav-item {
  display: flex;
  align-items: center;
  gap: var(--space-s);
  min-width: 0;
  padding: 0.5625rem var(--space-sm);
  border-radius: var(--radius-m);
  color: var(--text-2);
  font-size: var(--size-body);
  text-decoration: none;
  transition: background-color var(--duration) var(--ease), color var(--duration) var(--ease);
}

.nav-item > span:last-child {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.nav-item .icon {
  color: var(--accent);
}

.nav-item:hover,
.nav-item[aria-current="page"] {
  background: var(--surface-hover);
  color: var(--text);
}

.nav-item .dot {
  margin-inline: 0.25rem 0.1875rem;
}

.rail__foot {
  display: grid;
  gap: var(--space-sm);
  margin-top: auto;
  padding-top: var(--space-l);
}

.rail-status {
  display: grid;
  gap: var(--space-xs);
  padding: var(--space-s) 0.625rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
}

.rail-status__title {
  color: var(--text-2);
  font-size: var(--size-section);
  font-weight: var(--weight-strong);
  letter-spacing: var(--tracking-section);
  text-transform: uppercase;
}

.rail__version {
  color: var(--text-3);
  font-size: var(--size-caption);
}

/* Selector de apariencia: oscuro · claro · sistema */
.appearance {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-s);
}

.appearance__label {
  color: var(--text-3);
  font-size: var(--size-caption);
}

.theme-switch {
  display: grid;
  grid-template-columns: repeat(3, 2rem);
  gap: 2px;
  padding: 2px;
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
}

.theme-switch button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 1.75rem;
  padding: 0;
  border: 0;
  border-radius: 6px;
  background: transparent;
  color: var(--text-3);
  cursor: pointer;
  transition: background-color var(--duration) var(--ease), color var(--duration) var(--ease);
}

.theme-switch button:hover {
  color: var(--text);
}

.theme-switch button[aria-pressed="true"] {
  background: var(--surface-hover);
  color: var(--text);
}

.theme-switch button[aria-pressed="true"] .icon {
  color: var(--accent);
}

.theme-switch .icon {
  width: 14px;
  height: 14px;
}

/* ── Contenido ── */
.main {
  min-width: 0;
  padding: 2rem var(--space-xl) 4rem;
}

.page {
  max-width: var(--content-width);
}

.page-header {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--space-m) var(--space-l);
  margin-bottom: var(--space-xl);
}

.page-header__title {
  font-size: var(--size-title);
  font-weight: var(--weight-title);
  letter-spacing: -0.005em;
  line-height: 1.2;
}

.page-header__subtitle {
  margin-top: var(--space-xs);
  color: var(--text-3);
}

.page-header__aside {
  color: var(--text-3);
  font-size: var(--size-caption);
}

.breadcrumb {
  margin-bottom: var(--space-ml);
  font-size: var(--size-caption);
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-s);
  padding: 0;
  list-style: none;
}

.breadcrumb li {
  display: inline-flex;
  align-items: center;
  gap: var(--space-s);
}

.breadcrumb a {
  color: var(--text-2);
  text-decoration: none;
}

.breadcrumb a:hover {
  color: var(--text);
  text-decoration: underline;
}

.breadcrumb [aria-current="page"] {
  color: var(--text);
}

.breadcrumb .icon {
  width: 12px;
  height: 12px;
  color: var(--text-3);
}

/* ── Secciones: títulos pequeños en mayúsculas ── */
.section + .section {
  margin-top: var(--space-xl);
}

.section-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-m);
  margin-bottom: 0.625rem;
}

.section-header__title {
  color: var(--text-2);
  font-size: var(--size-section);
  font-weight: var(--weight-strong);
  letter-spacing: var(--tracking-section);
  text-transform: uppercase;
}

.section-header__count {
  color: var(--text-3);
  font-family: var(--font-mono);
  font-size: var(--size-caption);
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 21rem), 1fr));
  gap: var(--space-m);
}

/* ── Pantallas estrechas: la barra lateral pasa a barra superior ── */
@media (max-width: 1023px) {
  .shell {
    grid-template-columns: minmax(0, 1fr);
    grid-template-rows: auto minmax(0, 1fr);
  }

  .rail {
    z-index: 10;
    flex-direction: row;
    align-items: center;
    gap: var(--space-m);
    height: auto;
    padding: 0.625rem var(--space-m);
    overflow: visible;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .rail__nav {
    display: flex;
    margin-top: 0;
  }

  .rail__label,
  .rail__projects,
  .rail-status,
  .rail__version {
    display: none;
  }

  .rail__foot {
    margin: 0 0 0 auto;
    padding-top: 0;
  }

  .appearance__label {
    display: none;
  }

  .main {
    padding: var(--space-l) var(--space-m) 3rem;
  }
}

@media (max-width: 599px) {
  .rail__nav {
    display: none;
  }

  .page-header {
    margin-bottom: var(--space-l);
  }
}

/* ── Añadidos: enlace del encabezado, notas de sección, páginas estrechas y salida ── */
.page--narrow {
  max-width: 46rem;
}

.page-header__link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  color: var(--text-2);
  font-size: var(--size-caption);
  text-decoration: none;
}

.page-header__link:hover {
  color: var(--accent);
}

.section-header__side {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.section__note {
  max-width: 72ch;
  margin: -0.25rem 0 var(--space-sm);
  color: var(--text-3);
  font-size: var(--size-caption);
}

.rail__exit {
  margin: 0;
}

.nav-item--button {
  width: 100%;
  border: 0;
  background: transparent;
  font: inherit;
  text-align: left;
  cursor: pointer;
}

.nav-item--button .icon {
  color: var(--text-3);
}

@media (max-width: 1023px) {
  .rail__foot {
    grid-auto-flow: column;
    align-items: center;
  }

  .rail__exit .nav-item > span:last-child {
    display: none;
  }
}