/* ---------------------------------------------------------------- tokens */
:root {
  --warn: #bf8700;
  --bg: #ffffff;
  --bg-soft: #f6f7f9;
  --bg-sunken: #eceef1;
  --border: #dfe2e7;
  --border-soft: #e9ecf0;
  --text: #1f2328;
  --text-soft: #59636e;
  --text-faint: #8b949e;
  --accent: #2f6fdd;
  --accent-soft: #e7effc;
  --danger: #c0392b;
  --ok: #1a7f37;
  --shadow: 0 1px 3px rgba(20, 24, 32, .08), 0 6px 18px rgba(20, 24, 32, .06);
  --sidebar-w: 300px;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
[data-theme="dark"] {
  --warn: #d29922;
  --bg: #0d1117;
  --bg-soft: #161b22;
  --bg-sunken: #010409;
  --border: #30363d;
  --border-soft: #21262d;
  --text: #e6edf3;
  --text-soft: #9198a1;
  --text-faint: #6e7681;
  --accent: #4f8cf5;
  --accent-soft: #16243d;
  --danger: #f85149;
  --ok: #3fb950;
  --shadow: 0 1px 3px rgba(0, 0, 0, .4), 0 8px 24px rgba(0, 0, 0, .3);
}

* { box-sizing: border-box; }
/* El atributo hidden debe ganar siempre: si no, un `display` de clase lo anula
   y el elemento sigue capturando clics aunque no se vea. */
[hidden] { display: none !important; }
html, body { height: 100%; }
body {
  margin: 0;
  font: 14px/1.55 var(--sans);
  color: var(--text);
  background: var(--bg);
  overflow: hidden;
}
button, input, textarea { font: inherit; color: inherit; }

/* ------------------------------------------------------------------ shell */
#app {
  display: grid;
  grid-template-columns: var(--sidebar-w) 5px 1fr;
  height: 100vh;
  /* Sin esto, un hijo más alto que la ventana desborda el grid y el scroll
     interno de los paneles nunca llega a activarse. */
  overflow: hidden;
}
#app.no-sidebar { grid-template-columns: 0 0 1fr; }
#app.no-sidebar #sidebar, #app.no-sidebar #splitter { display: none; }

/* ---------------------------------------------------------------- sidebar */
#sidebar {
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 0;   /* los ítems de grid y flex traen min-height:auto */
  background: var(--bg-soft);
  border-right: 1px solid var(--border);
}
.side-head {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 12px 10px;
  border-bottom: 1px solid var(--border-soft);
}
.brand { display: flex; align-items: center; gap: 8px; min-width: 0; }
.brand .logo { flex: none; object-fit: contain; }
.brand-name { font-weight: 650; letter-spacing: -.2px; }
.icon-btn {
  background: none;
  border: 1px solid transparent;
  border-radius: 6px;
  padding: 3px 7px;
  color: var(--text-soft);
  cursor: pointer;
  line-height: 1.4;
  font-size: 12px;
}
.icon-btn:hover { background: var(--bg-sunken); color: var(--text); }
.side-head .icon-btn { margin-left: auto; }

/* Zona para soltar archivos: es la puerta de entrada de la herramienta. */
.dropzone {
  margin: 12px;
  padding: 20px 14px;
  border: 2px dashed var(--border);
  border-radius: 12px;
  text-align: center;
  color: var(--text-soft);
  cursor: pointer;
  transition: border-color .15s, background .15s, color .15s;
}
.dropzone:hover, .dropzone:focus-visible {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-soft);
  outline: none;
}
.dropzone.compact { padding: 12px 14px; }
.dropzone.compact svg, .dropzone.compact .dz-sub { display: none; }
.dropzone.compact .dz-title { font-size: 12.5px; }
.dz-title { margin: 8px 0 2px; font-size: 14px; color: var(--text); }
.dropzone:hover .dz-title { color: var(--accent); }
.dz-sub { margin: 0; font-size: 11.5px; }

.search-box { padding: 0 12px 8px; }
.search-box:has(#search:placeholder-shown):not(:hover) { opacity: .9; }
#search {
  width: 100%;
  padding: 7px 10px;
  border: 1px solid var(--border);
  border-radius: 7px;
  background: var(--bg);
  outline: none;
}
#search:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }

.list { flex: 1; overflow: auto; padding: 0 8px 12px; }
.item {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  padding: 7px 8px;
  border: 1px solid transparent;
  border-radius: 7px;
  background: none;
  text-align: left;
  cursor: pointer;
  color: var(--text);
}
.item:hover { background: var(--bg-sunken); }
.item.active { background: var(--accent-soft); border-color: var(--accent); color: var(--accent); }
.item .ic { flex: none; opacity: .6; }
.item.active .ic { opacity: 1; }
.item-main { min-width: 0; flex: 1; }
.item-name {
  display: block;
  font-weight: 550;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.item.active .item-name { font-weight: 650; }
.item-meta {
  display: block;
  font-size: 11px;
  color: var(--text-faint);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.item .dot {
  flex: none;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--warn);
}
.item .close {
  flex: none;
  border: 0;
  background: none;
  color: var(--text-faint);
  cursor: pointer;
  padding: 2px 4px;
  border-radius: 5px;
  line-height: 1;
  opacity: 0;
}
.item:hover .close, .item.active .close { opacity: 1; }
.item .close:hover { background: var(--danger); color: #fff; }
.list-empty { padding: 18px 10px; color: var(--text-faint); font-size: 12.5px; text-align: center; }

.side-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 7px 12px;
  border-top: 1px solid var(--border-soft);
  font-size: 11px;
  color: var(--text-faint);
}

.splitter { cursor: col-resize; background: transparent; }
.splitter:hover, .splitter.dragging { background: var(--accent); }

/* ------------------------------------------------------------------ main */
#main { display: flex; flex-direction: column; min-width: 0; min-height: 0; }
#toolbar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 14px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-soft);
  min-height: 46px;
}
.crumbs { min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-size: 13px; }
.crumbs .sep { color: var(--text-faint); margin: 0 4px; }
.crumbs .cur { font-weight: 600; }
.crumbs .dirty { color: var(--danger); margin-left: 6px; }
.muted { color: var(--text-faint); }
.tools { margin-left: auto; display: flex; align-items: center; gap: 10px; }

.segmented { display: flex; border: 1px solid var(--border); border-radius: 7px; overflow: hidden; }
.segmented button {
  border: 0;
  background: var(--bg);
  padding: 5px 11px;
  cursor: pointer;
  color: var(--text-soft);
  border-right: 1px solid var(--border);
}
.segmented button:last-child { border-right: 0; }
.segmented button.active { background: var(--accent); color: #fff; }

.btn {
  border: 1px solid var(--border);
  background: var(--bg);
  border-radius: 7px;
  padding: 5px 13px;
  cursor: pointer;
}
.btn:hover:not(:disabled) { border-color: var(--accent); color: var(--accent); }
.btn:disabled { opacity: .45; cursor: default; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.danger { background: var(--danger); border-color: var(--danger); color: #fff; }
.btn.danger:hover:not(:disabled) { filter: brightness(1.1); color: #fff; }
.status { font-size: 12px; color: var(--text-faint); min-width: 60px; }
.status.err { color: var(--danger); }
.status.ok { color: var(--ok); }

#panes { flex: 1; display: flex; min-height: 0; overflow: hidden; }
.pane { flex: 1; min-width: 0; min-height: 0; overflow: auto; }
#editorPane { border-right: 1px solid var(--border); background: var(--bg-sunken); }
#panes.single #editorPane { border-right: 0; }
#editor {
  width: 100%;
  height: 100%;
  border: 0;
  outline: none;
  resize: none;
  padding: 20px 22px;
  background: transparent;
  color: var(--text);
  font: 13.5px/1.7 var(--mono);
  tab-size: 2;
}
#preview { max-width: 900px; margin: 0 auto; padding: 28px 34px 120px; }

.empty { color: var(--text-soft); }
.empty h1 { border: 0; }
.keys { list-style: none; padding: 0; font-size: 13px; }
.keys li { margin: 6px 0; }
kbd {
  font: 11px var(--mono);
  border: 1px solid var(--border);
  border-bottom-width: 2px;
  border-radius: 4px;
  padding: 1px 5px;
  background: var(--bg-soft);
}

.toast {
  position: fixed;
  bottom: 18px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--text);
  color: var(--bg);
  padding: 9px 16px;
  border-radius: 8px;
  box-shadow: var(--shadow);
  z-index: 50;
  font-size: 13px;
}
.toast.err { background: var(--danger); color: #fff; }

/* -------------------------------------------------------- markdown render */
.markdown-body { word-wrap: break-word; }
.markdown-body > *:first-child { margin-top: 0; }
.markdown-body h1, .markdown-body h2, .markdown-body h3,
.markdown-body h4, .markdown-body h5, .markdown-body h6 {
  margin: 26px 0 14px;
  font-weight: 600;
  line-height: 1.25;
  scroll-margin-top: 20px;
}
.markdown-body h1 { font-size: 2em; padding-bottom: .3em; border-bottom: 1px solid var(--border); }
.markdown-body h2 { font-size: 1.5em; padding-bottom: .3em; border-bottom: 1px solid var(--border); }
.markdown-body h3 { font-size: 1.25em; }
.markdown-body h4 { font-size: 1em; }
.markdown-body h5 { font-size: .9em; }
.markdown-body h6 { font-size: .85em; color: var(--text-soft); }
.markdown-body p, .markdown-body ul, .markdown-body ol,
.markdown-body blockquote, .markdown-body table, .markdown-body pre { margin: 0 0 16px; }
.markdown-body ul, .markdown-body ol { padding-left: 2em; }
.markdown-body li + li { margin-top: .25em; }
.markdown-body li.task-list-item { list-style: none; margin-left: -1.5em; }
.markdown-body li.task-list-item input { margin-right: .5em; }
.markdown-body a { color: var(--accent); text-decoration: none; }
.markdown-body a:hover { text-decoration: underline; }
.markdown-body a.missing { color: var(--text-faint); text-decoration: underline dotted; cursor: help; }
.markdown-body .missing-img {
  display: inline-block;
  padding: 3px 9px;
  border: 1px dashed var(--border);
  border-radius: 6px;
  color: var(--text-faint);
  font: 12px var(--mono);
}
.markdown-body blockquote {
  padding: 0 1em;
  color: var(--text-soft);
  border-left: .25em solid var(--border);
}
.markdown-body hr { height: 1px; border: 0; background: var(--border); margin: 24px 0; }
.markdown-body img { max-width: 100%; border-radius: 6px; }
.markdown-body code {
  font: .87em var(--mono);
  background: var(--bg-sunken);
  padding: .2em .4em;
  border-radius: 5px;
}
.markdown-body pre {
  background: var(--bg-sunken);
  border: 1px solid var(--border-soft);
  border-radius: 8px;
  padding: 14px 16px;
  overflow-x: auto;
}
.markdown-body pre code { background: none; padding: 0; font-size: .85em; }
.markdown-body table { border-collapse: collapse; display: block; overflow-x: auto; width: max-content; max-width: 100%; }
.markdown-body th, .markdown-body td { border: 1px solid var(--border); padding: 6px 13px; }
.markdown-body thead th { background: var(--bg-soft); }
.markdown-body tbody tr:nth-child(2n) { background: var(--bg-soft); }
.markdown-body .mermaid { text-align: center; margin: 0 0 18px; }
.markdown-body .mermaid-error {
  border: 1px solid var(--danger);
  color: var(--danger);
  border-radius: 8px;
  padding: 10px 14px;
  font: 12px var(--mono);
  white-space: pre-wrap;
}
.markdown-body .footnotes { font-size: .9em; color: var(--text-soft); border-top: 1px solid var(--border); padding-top: 10px; }
.markdown-body .anchor {
  float: left;
  margin-left: -.85em;
  padding-right: .25em;
  opacity: 0;
  text-decoration: none;
}
.markdown-body h1:hover .anchor, .markdown-body h2:hover .anchor,
.markdown-body h3:hover .anchor, .markdown-body h4:hover .anchor { opacity: .5; }

@media (max-width: 720px) {
  #app { grid-template-columns: 1fr; }
  #sidebar { position: absolute; z-index: 20; width: 85vw; height: 100%; box-shadow: var(--shadow); }
  #splitter { display: none; }
  #panes.split #editorPane { display: none; }
}

/* ---------------------------------------------------------------- diálogos */
.dlg {
  width: min(760px, 92vw);
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--bg);
  color: var(--text);
  box-shadow: var(--shadow);
}
.dlg.small { width: min(440px, 92vw); }
.dlg::backdrop { background: rgba(10, 14, 20, .45); }
.dlg-head {
  display: flex;
  align-items: center;
  padding: 14px 16px;
  border-bottom: 1px solid var(--border-soft);
}
.dlg-head h2 { margin: 0; font-size: 15px; }
.dlg-head .icon-btn { margin-left: auto; }
.dlg-body { padding: 14px 16px; }
.dlg-text { margin: 0 0 10px; color: var(--text-soft); font-size: 13px; word-break: break-all; }
.dlg-foot {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  padding: 12px 16px;
  border-top: 1px solid var(--border-soft);
  background: var(--bg-soft);
  border-radius: 0 0 12px 12px;
}
/* ------------------------------------------------- superposición de arrastre */
.overlay {
  position: fixed;
  inset: 0;
  z-index: 80;
  display: grid;
  place-items: center;
  background: color-mix(in srgb, var(--accent) 14%, transparent);
  backdrop-filter: blur(2px);
}
.overlay-card {
  display: grid;
  justify-items: center;
  gap: 10px;
  padding: 34px 48px;
  border: 2px dashed var(--accent);
  border-radius: 16px;
  background: var(--bg);
  color: var(--accent);
  font-size: 16px;
  font-weight: 600;
  box-shadow: var(--shadow);
}
.overlay-card p { margin: 0; }

/* Estado vacío del panel principal. */
.welcome { max-width: 620px; margin: 8vh auto 0; text-align: center; color: var(--text-soft); }
.welcome .logo-big { object-fit: contain; }
.welcome h2 { border: 0; margin: 14px 0 6px; font-size: 26px; color: var(--text); }
.welcome .lead { font-size: 15px; margin: 0 0 26px; }
.welcome .cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; text-align: left; }
.welcome .card {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 14px;
  background: var(--bg-soft);
  font-size: 12.5px;
}
.welcome .card b { display: block; color: var(--text); margin-bottom: 3px; font-size: 13px; }
.welcome .card kbd { font-size: 10.5px; }
.welcome .note {
  margin: 22px 0 0;
  font-size: 12px;
  color: var(--text-faint);
  border-top: 1px solid var(--border-soft);
  padding-top: 14px;
}
@media (max-width: 720px) {
  .welcome .cards { grid-template-columns: 1fr; }
}

/* Título de página para lectores de pantalla y rastreadores: la interfaz ya
   muestra la marca en la barra lateral, así que visualmente sobra. */
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.noscript-note {
  max-width: 620px;
  margin: 10vh auto;
  padding: 0 20px;
  color: var(--text-soft);
  font-size: 15px;
  line-height: 1.6;
  text-align: center;
}

/* Página 404 */
.notfound {
  display: grid;
  place-content: center;
  justify-items: center;
  min-height: 100vh;
  text-align: center;
  color: var(--text-soft);
}
.notfound h1 { margin: 14px 0 6px; font-size: 44px; color: var(--text); border: 0; }
.notfound p { margin: 4px 0; }
.notfound a { color: var(--accent); }