/* CellView Atlas — 3 vistas */

/* ── Header ──────────────────────────────────────────────────────────────────── */
.atlas-header {
  background: var(--navy-mid);
  border-bottom: 1px solid var(--gray-700);
  padding: 1.5rem 2rem 0;
  padding-top: calc(1.5rem + 64px);
}
.atlas-header-inner { max-width: 1400px; margin: 0 auto; }
.atlas-title         { font-size: 1.5rem; font-weight: 700; color: var(--gray-100); margin-bottom: .25rem; }
.atlas-subtitle      { font-size: .85rem; color: var(--gray-500); margin-bottom: 1rem; }

/* Search bar */
.atlas-search-row {
  display: flex;
  align-items: center;
  gap: .5rem;
  margin-bottom: 1rem;
  max-width: 520px;
}
.atlas-search {
  flex: 1;
  background: var(--navy);
  border: 1px solid var(--gray-700);
  color: var(--gray-100);
  padding: .5rem 1rem .5rem 2.4rem;
  border-radius: 999px;
  font-size: .875rem;
  outline: none;
  transition: border-color .15s;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 24 24' fill='none' stroke='%237A849E' stroke-width='2'%3E%3Ccircle cx='11' cy='11' r='8'/%3E%3Cpath d='m21 21-4.35-4.35'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: .85rem center;
}
.atlas-search:focus { border-color: var(--sky); }
.atlas-search::placeholder { color: var(--gray-500); }

.atlas-tabs { display: flex; gap: .25rem; }
.atlas-tab  {
  padding: .55rem 1.2rem;
  border-radius: var(--radius) var(--radius) 0 0;
  border: 1px solid transparent;
  border-bottom: none;
  background: transparent;
  color: var(--gray-500);
  font-size: .875rem;
  cursor: pointer;
  transition: all .15s;
}
.atlas-tab:hover  { color: var(--gray-100); background: rgba(255,255,255,.04); }
.atlas-tab.active { background: var(--navy); border-color: var(--gray-700); color: var(--sky); font-weight: 600; }

.atlas-body { max-width: 1400px; margin: 0 auto; }

/* ── Skeletons ───────────────────────────────────────────────────────────────── */
@keyframes shimmer { 0%{opacity:.4} 50%{opacity:.8} 100%{opacity:.4} }
.sk-line  { height: 12px; border-radius: 4px; background: var(--gray-700); animation: shimmer 1.5s infinite; margin-bottom: .5rem; }
.sk-w80   { width: 80%; }
.sk-w60   { width: 60%; }
.sk-img   { height: 160px; background: var(--gray-700); animation: shimmer 1.5s infinite; border-radius: var(--radius) var(--radius) 0 0; }
.skeleton-card { background: var(--navy-mid); border: 1px solid var(--gray-700); border-radius: var(--radius); overflow: hidden; }

/* ── Model Grid ──────────────────────────────────────────────────────────────── */
.model-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(210px, 1fr));
  gap: 1rem;
  padding: 1rem;
}
.model-card {
  background: var(--navy-mid);
  border: 1px solid var(--gray-700);
  border-radius: var(--radius);
  overflow: hidden;
  text-decoration: none;
  color: var(--gray-100);
  transition: transform .15s, border-color .15s, box-shadow .15s;
  display: flex;
  flex-direction: column;
}
.model-card:hover {
  transform: translateY(-2px);
  border-color: var(--sky);
  box-shadow: 0 4px 20px rgba(59,158,204,.12);
}
.model-done { border-color: rgba(26,140,91,.5); }

.card-img   { position: relative; height: 160px; overflow: hidden; background: var(--navy); }
.card-img img { width: 100%; height: 100%; object-fit: cover; transition: transform .3s; }
.model-card:hover .card-img img { transform: scale(1.04); }
.card-thumb-emoji { display: flex; align-items: center; justify-content: center; height: 100%; font-size: 3rem; opacity: .35; }

.card-done-badge {
  position: absolute; top: .5rem; left: .5rem;
  background: rgba(26,140,91,.9); color: #fff;
  font-size: .65rem; font-weight: 700; padding: 2px 8px; border-radius: 999px;
}

/* Badge de tipo — contenedor redondeado con fondo sólido */
.card-tipo-badge {
  position: absolute; top: .5rem; right: .5rem;
  background: color-mix(in srgb, var(--badge-color) 20%, #0B1736);
  color: var(--badge-color);
  border: 1px solid color-mix(in srgb, var(--badge-color) 40%, transparent);
  font-size: .65rem;
  font-weight: 600;
  padding: 3px 9px;
  border-radius: 999px;
  display: flex;
  align-items: center;
  gap: 3px;
  backdrop-filter: blur(4px);
  white-space: nowrap;
  max-width: calc(100% - 1rem);
  overflow: hidden;
  text-overflow: ellipsis;
}

.card-body   { padding: .75rem; flex: 1; display: flex; flex-direction: column; gap: .2rem; }
.card-topic  { font-size: .68rem; color: var(--sky); opacity: .8; }
.card-titulo { font-size: .88rem; font-weight: 600; margin: 0; line-height: 1.3; }
.card-desc   { font-size: .73rem; color: var(--gray-500); flex: 1; line-height: 1.45; margin-top: .15rem; }

.empty-state {
  display: flex; flex-direction: column; align-items: center;
  justify-content: center; gap: .5rem; padding: 4rem;
  color: var(--gray-500); font-size: .9rem;
}
.empty-state span { font-size: 2.5rem; }

/* ── EXPLORAR view ───────────────────────────────────────────────────────────── */
.explorar-layout {
  display: grid;
  grid-template-columns: 256px 1fr;
  min-height: calc(100vh - 160px);
}
.topic-tree-panel {
  background: var(--navy-mid);
  border-right: 1px solid var(--gray-700);
  overflow-y: auto;
  max-height: calc(100vh - 160px);
  position: sticky;
  top: 0;
  /* Scrollbar moderna */
  scrollbar-width: thin;
  scrollbar-color: var(--gray-700) transparent;
}
.topic-tree-panel::-webkit-scrollbar        { width: 4px; }
.topic-tree-panel::-webkit-scrollbar-track  { background: transparent; }
.topic-tree-panel::-webkit-scrollbar-thumb  { background: var(--gray-700); border-radius: 999px; }
.topic-tree-panel::-webkit-scrollbar-thumb:hover { background: var(--gray-500); }
.tree-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: .75rem 1rem;
  font-size: .72rem; text-transform: uppercase; letter-spacing: .08em;
  color: var(--gray-500);
  border-bottom: 1px solid var(--gray-700);
  position: sticky; top: 0; background: var(--navy-mid); z-index: 1;
}
.tree-reset-btn {
  background: none; border: none; color: var(--gray-500);
  cursor: pointer; font-size: .85rem; padding: 2px 6px; border-radius: 4px;
}
.tree-reset-btn:hover { background: var(--gray-700); color: var(--gray-100); }

.topic-tree  { padding: .5rem; }
.tree-item   { margin-bottom: 1px; }
.tree-item-row {
  display: flex; align-items: center; gap: .4rem;
  padding: .38rem .5rem; border-radius: 6px;
  cursor: pointer; font-size: .82rem;
  transition: background .1s;
}
.tree-item-row:hover    { background: rgba(255,255,255,.05); }
.tree-item-row.selected { background: rgba(59,158,204,.15); color: var(--sky); }
.tree-toggle  { font-size: .6rem; color: var(--gray-500); width: 12px; flex-shrink: 0; }
.tree-spacer  { width: 12px; flex-shrink: 0; }
.tree-icono   { font-size: .88rem; flex-shrink: 0; }
.tree-nombre  { flex: 1; }
.tree-count   { font-size: .64rem; color: var(--gray-500); background: rgba(255,255,255,.06); padding: 1px 6px; border-radius: 10px; flex-shrink: 0; }
.tree-children.collapsed { display: none; }

.explorar-content  { overflow-y: auto; }
.explorar-toolbar  {
  display: flex; align-items: center; justify-content: space-between;
  padding: .6rem 1rem; border-bottom: 1px solid var(--gray-700);
}
.explorar-breadcrumb { color: var(--gray-100); font-weight: 600; font-size: .85rem; }
.explorar-count      { color: var(--gray-500); font-size: .78rem; }

/* ── RUTA view ───────────────────────────────────────────────────────────────── */
.ruta-container { max-width: 860px; margin: 0 auto; padding: 1.5rem 1rem 3rem; }
.ruta-intro     { margin-bottom: 1.5rem; }
.ruta-intro h2  { font-size: 1.1rem; font-weight: 700; margin-bottom: .25rem; }
.ruta-intro p   { font-size: .85rem; color: var(--gray-500); margin-bottom: .75rem; }
.ruta-leyenda   { display: flex; gap: .5rem; flex-wrap: wrap; }
.ruta-loading   { color: var(--gray-500); padding: 2rem; text-align: center; }
.ruta-unidad-chip { font-size: .75rem; padding: .25rem .75rem; border-radius: 20px; font-weight: 600; }
.u-I   { background: rgba(59,158,204,.15);  color: var(--sky); }
.u-II  { background: rgba(26,140,91,.15);   color: #4ade80; }
.u-III { background: rgba(201,168,76,.15);  color: var(--gold); }

.ruta-unidad       { margin-bottom: 2rem; }
.ruta-unidad-label {
  font-size: .72rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: .1em; padding: .4rem .75rem;
  border-left: 3px solid; border-radius: 0 6px 6px 0;
  margin-bottom: .6rem;
}
.ruta-clases { display: flex; flex-direction: column; gap: .5rem; }

.ruta-clase {
  display: grid; grid-template-columns: 2.4rem 1fr;
  gap: .75rem; align-items: start;
  background: var(--navy-mid); border: 1px solid var(--gray-700);
  border-radius: var(--radius); padding: .7rem;
  transition: border-color .15s;
}
.ruta-clase-num {
  width: 2.1rem; height: 2.1rem; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: .78rem; font-weight: 700; flex-shrink: 0;
}
.ruta-clase-body    { min-width: 0; }
.ruta-clase-titulo  { font-size: .875rem; font-weight: 600; margin-bottom: .1rem; }
.ruta-clase-fecha   { font-size: .7rem; color: var(--gray-500); margin-bottom: .5rem; }

/* Multi-model row */
.ruta-models-row {
  display: flex; flex-wrap: wrap; gap: .5rem;
}
.ruta-mini-card {
  display: flex; align-items: center; gap: .45rem;
  text-decoration: none; color: var(--gray-100);
  background: rgba(255,255,255,.03); border: 1px solid var(--gray-700);
  border-radius: 8px; padding: .35rem .55rem;
  transition: border-color .15s, background .15s;
  max-width: 220px; min-width: 0;
  position: relative;
}
.ruta-mini-card:hover { border-color: var(--sky); background: rgba(59,158,204,.07); }
.ruta-mini-card.done  { border-color: rgba(26,140,91,.4); }
.ruta-mini-thumb {
  width: 34px; height: 34px; border-radius: 5px;
  background: var(--gray-700); flex-shrink: 0;
  display: flex; align-items: center; justify-content: center; overflow: hidden;
}
.ruta-mini-thumb img { width: 100%; height: 100%; object-fit: cover; }
.ruta-mini-titulo {
  font-size: .75rem; font-weight: 500;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis; flex: 1;
}
.ruta-mini-done {
  position: absolute; top: -5px; right: -5px;
  background: #1A8C5B; color: #fff; border-radius: 50%;
  width: 16px; height: 16px; font-size: .6rem;
  display: flex; align-items: center; justify-content: center; font-weight: 700;
}
.ruta-sin-modelo { font-size: .78rem; color: var(--gray-500); font-style: italic; }

/* ── TIPO view ───────────────────────────────────────────────────────────────── */
.tipo-container { padding-top: 1rem; }
.tipo-filters   {
  display: flex; gap: .4rem; flex-wrap: wrap;
  padding: .75rem 1rem; border-bottom: 1px solid var(--gray-700);
}
.tipo-chip {
  display: flex; align-items: center; gap: .3rem;
  padding: .38rem .9rem; border-radius: 999px;
  border: 1px solid var(--gray-700); background: transparent;
  color: var(--gray-500); font-size: .8rem; cursor: pointer;
  transition: all .15s;
}
.tipo-chip:hover  { border-color: var(--sky); color: var(--gray-100); }
.tipo-chip.active {
  background: var(--sky); border-color: var(--sky); color: #fff; font-weight: 600;
}

/* ── Responsive ──────────────────────────────────────────────────────────────── */
@media (max-width: 768px) {
  .explorar-layout    { grid-template-columns: 1fr; }
  .topic-tree-panel   { max-height: 220px; position: static; border-right: none; border-bottom: 1px solid var(--gray-700); }
  .atlas-header       { padding: 1rem 1rem 0; padding-top: calc(1rem + 56px); }
  .atlas-tab          { padding: .42rem .7rem; font-size: .78rem; }
  .ruta-container     { padding: 1rem .5rem 2rem; }
  .ruta-models-row    { flex-direction: column; }
  .ruta-mini-card     { max-width: 100%; }
}