/* ==========================================================================
   03 · LAYOUT
   Contenedores, rejillas, cabecera, pie y navegación.
   ========================================================================== */

.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: var(--sp-7); }
.section--tight { padding-block: var(--sp-5); }
.section--alt {
  background: linear-gradient(180deg, transparent, var(--bg-2) 18%, var(--bg-2) 82%, transparent);
}

/* Rejillas reutilizables */
.grid-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 260px), 1fr));
  gap: var(--sp-4);
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 360px;
  gap: var(--sp-5);
  align-items: start;
}

.sidebar-layout {
  display: grid;
  grid-template-columns: 250px minmax(0, 1fr);
  gap: var(--sp-5);
  align-items: start;
}

@media (max-width: 960px) {
  .split, .sidebar-layout { grid-template-columns: minmax(0, 1fr); }
}

.cluster { display: flex; flex-wrap: wrap; gap: var(--sp-3); align-items: center; }
.cluster--between { justify-content: space-between; }
.cluster--end { justify-content: flex-end; }
.stack > * + * { margin-top: var(--sp-4); }
.stack-lg > * + * { margin-top: var(--sp-5); }

.sticky-aside { position: sticky; top: calc(var(--header-h) + var(--sp-4)); }
.sticky-aside > * + * { margin-top: var(--sp-4); }
@media (max-width: 960px) { .sticky-aside { position: static; } }

/* --------------------------------------------------------------------------
   Cabecera
   -------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: var(--header-bg);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  border-bottom: 1px solid transparent;
}
.site-header__bar {
  display: flex;
  align-items: center;
  gap: var(--sp-5);
  height: var(--header-h);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: .65rem;
  color: var(--text);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.6rem;
  letter-spacing: .04em;
  flex: none;
}
.brand:hover { color: var(--text); }
.brand__mark { width: 38px; height: 38px; flex: none; }
.brand__name span { color: var(--accent-text); }

.main-nav {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  align-self: stretch;
  margin-inline: auto;
  padding: 0 var(--sp-6);
  background: var(--nav-tab);
  border: 1px solid var(--line);
  border-top: 0;
  border-radius: 0 0 44px 44px;
}
.main-nav__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  padding: .55rem .9rem;
  color: var(--text);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: .95rem;
  letter-spacing: .03em;
  text-transform: uppercase;
}
.main-nav__link:hover { color: var(--accent-text); }
.main-nav__link.is-active { color: var(--accent-text); }
.main-nav__link.is-active::after {
  content: "";
  position: absolute;
  left: .9rem; right: .9rem; bottom: 2px;
  height: 2px;
  background: var(--accent-text);
  box-shadow: 0 0 10px var(--accent-glow);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
}

.icon-btn {
  display: inline-grid;
  place-items: center;
  width: 40px; height: 40px;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--text-2);
  cursor: pointer;
  clip-path: polygon(var(--cut-sm) 0, 100% 0, 100% calc(100% - var(--cut-sm)), calc(100% - var(--cut-sm)) 100%, 0 100%, 0 var(--cut-sm));
  transition: color var(--t-fast), background var(--t-fast);
}
.icon-btn:hover { color: var(--text); background: var(--surface-2); }
.icon-btn .icon { width: 20px; height: 20px; }

/* Interruptor de tema: muestra el icono del tema al que se cambia */
.theme-toggle .icon-sun { display: none; }
:root[data-theme="dark"] .theme-toggle .icon-sun { display: block; }
:root[data-theme="dark"] .theme-toggle .icon-moon { display: none; }

.nav-toggle { display: none; }

/* Menú de usuario */
.user-menu { position: relative; }
.user-menu > summary {
  list-style: none;
  display: flex;
  align-items: center;
  gap: .55rem;
  cursor: pointer;
  padding: 4px 10px 4px 4px;
  border: 1px solid var(--line);
  background: var(--surface);
  clip-path: polygon(var(--cut-sm) 0, 100% 0, 100% calc(100% - var(--cut-sm)), calc(100% - var(--cut-sm)) 100%, 0 100%, 0 var(--cut-sm));
}
.user-menu > summary::-webkit-details-marker { display: none; }
.user-menu > summary:hover { background: var(--surface-2); }
.user-menu__name { font-weight: 600; font-size: var(--fs-sm); max-width: 140px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.user-menu__panel {
  position: absolute;
  right: 0;
  top: calc(100% + 10px);
  min-width: 240px;
  background: var(--surface);
  border: 1px solid var(--line-strong);
  box-shadow: var(--shadow);
  padding: var(--sp-2);
  z-index: 70;
}
.user-menu__head { padding: var(--sp-2) var(--sp-3) var(--sp-3); border-bottom: 1px solid var(--line); margin-bottom: var(--sp-2); }
.user-menu__head strong { display: block; }
.user-menu__head span { color: var(--text-3); font-size: var(--fs-sm); }
.user-menu__item {
  display: flex;
  align-items: center;
  gap: .6rem;
  width: 100%;
  padding: .55rem var(--sp-3);
  color: var(--text-2);
  background: none;
  border: 0;
  text-align: left;
  cursor: pointer;
}
.user-menu__item:hover { background: var(--surface-2); color: var(--text); }
.user-menu__item .icon { width: 18px; height: 18px; color: var(--text-3); }
.user-menu hr { margin: var(--sp-2) 0; }

/* Navegación del móvil */
@media (max-width: 900px) {
  .nav-toggle { display: inline-grid; }
  .header-actions { margin-left: auto; }
  .main-nav {
    position: fixed;
    inset: var(--header-h) 0 auto 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    margin: 0;
    border-radius: 0;
    border: 0;
    padding: var(--sp-3) var(--gutter) var(--sp-5);
    background: var(--surface);
    border-bottom: 1px solid var(--line-strong);
    box-shadow: var(--shadow);
    transform: translateY(-8px);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--t) var(--ease), transform var(--t) var(--ease), visibility var(--t);
  }
  .site-header.is-open .main-nav { opacity: 1; transform: none; visibility: visible; }
  .main-nav__link { padding: .9rem .25rem; border-bottom: 1px solid var(--line); }
  .main-nav__link.is-active::after { left: 0; right: auto; top: 25%; bottom: 25%; width: 2px; height: auto; }
  .user-menu__name { display: none; }
  .header-actions .btn--ghost { display: none; }
}

@media (max-width: 420px) {
  .brand__name { display: none; }
}

/* --------------------------------------------------------------------------
   Pie
   -------------------------------------------------------------------------- */
.site-footer {
  position: relative;
  background: var(--bg-2);
  color: var(--text-3);
  font-size: var(--fs-sm);
}
/* Borde superior dentado */
.site-footer::before {
  content: "";
  position: absolute;
  left: 0; right: 0; top: -18px;
  height: 19px;
  background: var(--bg-2);
  clip-path: polygon(0 100%, 0 70%, 54% 70%, 56% 0, 58% 70%, 70% 70%, 72% 15%, 74% 70%, 88% 70%, 89% 30%, 90% 70%, 100% 70%, 100% 100%);
}

.site-footer__grid {
  display: grid;
  grid-template-columns: 1.4fr repeat(3, 1fr);
  gap: var(--sp-6);
  padding-block: var(--sp-7) var(--sp-6);
}
.site-footer h4 {
  font-size: var(--fs-sm);
  text-transform: uppercase;
  letter-spacing: .14em;
  color: var(--text-2);
  margin-bottom: var(--sp-3);
}
.site-footer ul { list-style: none; padding: 0; margin: 0; display: grid; gap: .45rem; }
.site-footer a { color: var(--text-3); }
.site-footer a:hover { color: var(--accent-text); }
.site-footer__bottom {
  display: flex;
  justify-content: space-between;
  gap: var(--sp-3);
  flex-wrap: wrap;
  padding-block: var(--sp-4);
  border-top: 1px solid var(--line);
}
@media (max-width: 760px) {
  /* Borde superior dentado */
.site-footer::before {
  content: "";
  position: absolute;
  left: 0; right: 0; top: -18px;
  height: 19px;
  background: var(--bg-2);
  clip-path: polygon(0 100%, 0 70%, 54% 70%, 56% 0, 58% 70%, 70% 70%, 72% 15%, 74% 70%, 88% 70%, 89% 30%, 90% 70%, 100% 70%, 100% 100%);
}

.site-footer__grid { grid-template-columns: 1fr 1fr; }
  .site-footer__about { grid-column: 1 / -1; }
}
.site-footer__about p { margin-top: var(--sp-3); max-width: 22rem; }

/* Botón para volver arriba */
.to-top {
  position: fixed;
  right: var(--gutter);
  bottom: var(--gutter);
  z-index: 55;
  display: grid;
  place-items: center;
  width: 46px; height: 46px;
  background: var(--accent);
  color: var(--accent-ink);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity var(--t), transform var(--t), visibility var(--t);
}
.to-top:hover { color: var(--accent-ink); background: var(--accent-2); }
.to-top.is-visible { opacity: 1; visibility: visible; transform: none; }
.to-top .icon { width: 22px; height: 22px; stroke-width: 2.4; }