:root {
  --bg: #0b1220;
  --panel: rgba(14, 22, 34, 0.82);
  --edge: rgba(160, 200, 255, 0.28);
  --text: #eaf2fb;
  --dim: #9fb4c8;
  --accent: #ffb347;
  --accent2: #5cc8ff;
}
* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; background: var(--bg); color: var(--text); font-family: "Segoe UI", "Helvetica Neue", Arial, sans-serif; }
body.scene { overflow: hidden; }
#app { position: fixed; inset: 0; }
#app canvas { display: block; width: 100%; height: 100%; }

.hud {
  position: fixed; left: 16px; top: 16px; max-width: min(440px, calc(100vw - 32px));
  background: var(--panel); border: 1px solid var(--edge); border-radius: 14px; padding: 14px 16px;
  backdrop-filter: blur(8px); z-index: 5; line-height: 1.4;
}
.hud h1 { font-size: 17px; margin: 0 0 4px; letter-spacing: .01em; }
.hud p { margin: 4px 0; font-size: 13.5px; color: var(--dim); }
.hud b { color: var(--text); font-weight: 600; }
.hud a { color: var(--accent2); text-decoration: none; }
.hud a:hover { text-decoration: underline; }
.hud .row { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 10px; }
.hud details { margin-top: 8px; }
.hud summary { cursor: pointer; color: var(--accent2); font-size: 13px; }

.controls {
  position: fixed; left: 50%; bottom: 16px; transform: translateX(-50%); z-index: 5;
  display: flex; gap: 10px; align-items: center; flex-wrap: wrap; justify-content: center;
  background: var(--panel); border: 1px solid var(--edge); border-radius: 14px; padding: 10px 14px; max-width: calc(100vw - 32px);
  backdrop-filter: blur(8px);
}
.controls label { font-size: 13px; color: var(--dim); display: flex; gap: 8px; align-items: center; }
.controls input[type=range] { width: 200px; accent-color: var(--accent2); }
.controls output { min-width: 72px; font-variant-numeric: tabular-nums; color: var(--text); font-weight: 600; }
button.btn {
  background: rgba(60, 86, 120, .9); color: #fff; border: 1px solid var(--edge); border-radius: 10px;
  padding: 8px 12px; font: inherit; font-size: 13.5px; font-weight: 600; cursor: pointer;
}
a.btn { display: inline-block; text-decoration: none; background: rgba(60, 86, 120, .9); color: #fff; border: 1px solid var(--edge); border-radius: 10px; padding: 9px 14px; font-size: 14px; font-weight: 600; }
a.btn:hover { background: rgba(92, 128, 176, .98); text-decoration: none; }
button.btn:hover { background: rgba(92, 128, 176, .98); }
button.btn.on { background: var(--accent); color: #1a1206; border-color: transparent; }
select.idioma {
  background: rgba(60, 86, 120, .9); color: #fff; border: 1px solid var(--edge); border-radius: 10px;
  padding: 7px 10px; font: inherit; font-size: 13.5px; font-weight: 600; cursor: pointer;
}
select.idioma option { background: #16212f; color: #fff; }
.home .idiomas { display: flex; justify-content: flex-end; margin: 0 0 6px; }

#vr-button { z-index: 6; left: auto !important; right: 16px !important; bottom: 16px !important; width: auto !important; padding: 12px 18px !important; font: 600 13px 'Segoe UI', Arial, sans-serif !important; letter-spacing: .04em; border-radius: 12px !important; }
.pantalla-carga {
  position: fixed; inset: 0; display: grid; place-items: center; z-index: 20;
  background: radial-gradient(ellipse at 50% 40%, rgba(24, 38, 60, .97), rgba(8, 13, 22, .98));
  color: var(--dim); transition: opacity .4s ease;
}
.pantalla-carga.fuera { opacity: 0; pointer-events: none; }
.carga { width: min(420px, 82vw); text-align: center; }
.carga-titulo { font-size: 26px; font-weight: 700; color: #eaf2fb; letter-spacing: .01em; margin-bottom: 6px; }
.carga-texto { font-size: 15px; min-height: 1.4em; margin-bottom: 16px; }
.carga-barra { height: 6px; border-radius: 3px; background: rgba(160, 200, 255, .14); overflow: hidden; position: relative; }
.carga-barra span { position: absolute; inset: 0 auto 0 0; width: 0; border-radius: 3px; background: linear-gradient(90deg, #ffb347, #ffd08a); transition: width .3s ease; }
.carga-barra.indet span { width: 34%; animation: carga-indet 1.2s ease-in-out infinite; }
@keyframes carga-indet { from { left: -34%; } to { left: 100%; } }
.carga-nota { font-size: 12.5px; margin-top: 14px; opacity: .7; }
@media (prefers-reduced-motion: reduce) { .carga-barra.indet span { animation: none; left: 33%; } }

/* Portada */
body.home { overflow: auto; }
.wrap { max-width: 980px; margin: 0 auto; padding: 36px 20px 64px; }
.wrap h1 { font-size: clamp(26px, 4.4vw, 40px); margin: 0 0 8px; line-height: 1.12; }
.wrap .lead { color: var(--dim); font-size: 17px; margin: 0 0 28px; max-width: 760px; }
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 18px; }
.card {
  background: var(--panel); border: 1px solid var(--edge); border-radius: 18px; overflow: hidden; display: flex; flex-direction: column;
}
.card .thumb { aspect-ratio: 16/9; background: #12202f; display: block; width: 100%; object-fit: cover; }
.card .body { padding: 16px 18px 18px; display: flex; flex-direction: column; gap: 8px; flex: 1; }
.card h2 { margin: 0; font-size: 20px; }
.card p { margin: 0; color: var(--dim); font-size: 14.5px; line-height: 1.5; }
.wrap .eq { font-size: 18px; font-family: "Cambria Math", "Times New Roman", serif; color: var(--text); font-size: 16px; }
.card a.go { margin-top: auto; align-self: flex-start; text-decoration: none; }
.wrap h3 { margin: 34px 0 8px; font-size: 18px; }
.wrap ol, .wrap ul { color: var(--dim); line-height: 1.6; padding-left: 20px; }
.wrap code { background: rgba(255,255,255,.08); padding: 1px 6px; border-radius: 6px; color: var(--text); }
.foot { margin-top: 40px; color: var(--dim); font-size: 13px; border-top: 1px solid var(--edge); padding-top: 16px; }
.foot a { color: var(--accent2); }

/* Mundo de la Guía 4 */
#menu {
  position: fixed; right: 16px; top: 16px; width: 270px; max-height: calc(100vh - 120px); overflow: auto; z-index: 5;
  background: var(--panel); border: 1px solid var(--edge); border-radius: 14px; padding: 10px 10px 12px; backdrop-filter: blur(8px);
}
#menu h2 { font-size: 14px; margin: 2px 4px 8px; color: var(--dim); letter-spacing: .06em; text-transform: uppercase; display: flex; justify-content: space-between; align-items: center; }
#menu-toggle { background: none; border: 0; color: var(--accent2); cursor: pointer; font: inherit; font-size: 13px; }
#menu ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; }
#menu li.grupo { font-size: 12px; color: var(--dim); margin: 8px 4px 0; text-transform: uppercase; letter-spacing: .05em; }
#menu button.btn { width: 100%; text-align: left; display: flex; flex-direction: column; gap: 1px; padding: 7px 10px; }
#menu button.btn small { font-weight: 400; font-size: 11.5px; color: #c9d6e3; }
#menu button.btn.on small { color: #3a2a10; }
body.menu-cerrado #menu ul { display: none; }
.hud .etq { font-size: 12px; color: var(--accent); letter-spacing: .05em; text-transform: uppercase; margin: 0 0 2px; }
@media (max-width: 760px) { #menu { width: 210px; } }

/* Mundo: la interfaz ocupa franjas propias alrededor de la escena y nada se superpone a ella.
   El lienzo cubre la ventana detrás de la grilla y se dibuja solo en los rectángulos #escena y #grafico. */
body.mundo { display: grid; height: 100vh; overflow: hidden;
  grid-template-columns: auto minmax(0, 1fr) clamp(300px, 30vw, 460px);
  grid-template-rows: auto auto minmax(0, 1fr) auto;
  grid-template-areas: "barra barra barra" "enun enun enun" "menu escena lamina" "menu controles lamina"; }
body.mundo #app { position: fixed; inset: 0; z-index: 0; }
body.mundo > header, body.mundo > section, body.mundo > nav, body.mundo > main, body.mundo > aside, body.mundo > .controls { position: relative; z-index: 1; }
body.mundo #barra { grid-area: barra; display: flex; align-items: center; gap: 10px; flex-wrap: wrap; padding: 8px 14px; background: #0e1724; border-bottom: 1px solid var(--edge); }
body.mundo #barra .titulo { margin-right: auto; min-width: 0; }
body.mundo #barra .etq { font-size: 11.5px; color: var(--accent); letter-spacing: .05em; text-transform: uppercase; margin: 0; }
body.mundo #barra h1 { font-size: 18px; margin: 0; line-height: 1.25; }
body.mundo #barra .btn { padding: 7px 12px; font-size: 13px; }
body.mundo #barra button[aria-expanded="true"] { background: rgba(92, 128, 176, .98); }
body.mundo #info { font: 12px monospace; color: var(--dim); }
body.mundo #info:empty { display: none; }
body.mundo #vr-slot { display: flex; }
body.mundo #vr-button { position: static !important; left: auto !important; right: auto !important; bottom: auto !important; padding: 8px 14px !important; font: 600 12.5px 'Segoe UI', Arial, sans-serif !important; border-radius: 10px !important; opacity: 1 !important; }
body.mundo #enunciado { grid-area: enun; background: #101b2a; border-bottom: 1px solid var(--edge); padding: 10px 16px; font-size: 14px; line-height: 1.5; color: var(--text); }
body.mundo #enunciado p { margin: 4px 0; max-width: 1100px; }
body.mundo #enunciado .uso { color: var(--dim); font-size: 13px; }
body.mundo #menu { grid-area: menu; position: relative; inset: auto; width: 250px; max-height: none; overflow: auto; border-radius: 0; border: 0; border-right: 1px solid var(--edge); background: #0e1724; padding: 10px; backdrop-filter: none; }
body.mundo.menu-cerrado #menu { display: none; }
body.mundo #escena { grid-area: escena; min-height: 0; min-width: 0; pointer-events: none; }
/* subtítulos de la narración: al pie de la escena, sin tapar el panel ni el gráfico */
body.mundo #escena { position: relative; }
body.mundo #subtitulo { position: absolute; left: 50%; bottom: 14px; transform: translateX(-50%); width: max-content; max-width: min(86%, 860px); margin: 0;
  padding: 7px 14px; border-radius: 8px; background: rgba(8, 14, 22, .8); color: #f2f6fb; font-size: 15px; line-height: 1.4; text-align: center; pointer-events: none; }
body.mundo #subtitulo[hidden] { display: none; }
body.mundo #barra button[aria-pressed="false"] { opacity: .75; }
body.mundo #lamina { grid-area: lamina; display: flex; flex-direction: column; min-height: 0; overflow: auto; border-left: 1px solid var(--edge); background: transparent; }
body.mundo #paneles { background: #0e1724; padding: 10px; display: flex; flex-direction: column; gap: 10px; }
body.mundo #paneles canvas { display: block; width: 100%; height: auto; border-radius: 10px; touch-action: none; }
body.mundo #paneles p { margin: 6px 4px; color: var(--dim); font-size: 14px; line-height: 1.5; }
body.mundo #lamina .grafico { flex: 0 0 auto; width: 100%; pointer-events: none; border-top: 1px solid var(--edge); }
body.mundo.sin-ui { grid-template-columns: minmax(0, 1fr); grid-template-rows: minmax(0, 1fr); grid-template-areas: "escena"; }
body.mundo.sin-ui > :not(#app):not(#escena):not(script) { display: none !important; }
body.mundo #lamina::after { content: ""; flex: 1; background: #0e1724; }
body.mundo .controls { grid-area: controles; position: relative; left: auto; bottom: auto; transform: none; max-width: none; border-radius: 0; border: 0; border-top: 1px solid var(--edge); background: #0e1724; backdrop-filter: none; padding: 8px 12px; }
@media (max-width: 820px) {
  body.mundo { height: auto; min-height: 100vh; overflow: auto; grid-template-columns: minmax(0, 1fr); grid-template-rows: auto auto auto 56vh auto auto;
    grid-template-areas: "barra" "enun" "menu" "escena" "controles" "lamina"; }
  body.mundo #menu { width: auto; max-height: 34vh; border-right: 0; border-bottom: 1px solid var(--edge); }
  body.mundo #lamina { border-left: 0; overflow: visible; }
  body.mundo #lamina::after { display: none; }
}

/* Portada: obra destacada y lista de estaciones */
.destacado { display: grid; grid-template-columns: 1.5fr 1fr; gap: 0; background: var(--panel); border: 1px solid var(--edge); border-radius: 18px; overflow: hidden; margin: 8px 0 10px; }
.destacado .thumb-grande { display: block; width: 100%; height: 100%; aspect-ratio: 16/9; object-fit: cover; }
.destacado .body { padding: 18px 20px; display: flex; flex-direction: column; gap: 8px; justify-content: center; }
.destacado h2 { margin: 0; font-size: 24px; }
.destacado p { margin: 0; color: var(--dim); line-height: 1.5; }
.destacado .etq { color: var(--accent); font-size: 12.5px; letter-spacing: .05em; text-transform: uppercase; }
.destacado .btn { align-self: flex-start; }
ul.estaciones { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 12px; }
ul.estaciones a { display: flex; flex-direction: column; text-decoration: none; color: var(--text); background: var(--panel); border: 1px solid var(--edge); border-radius: 12px; overflow: hidden; height: 100%; }
ul.estaciones a:hover { border-color: var(--accent2); }
ul.estaciones img { display: block; width: 100%; aspect-ratio: 16/9; object-fit: cover; }
ul.estaciones span { padding: 8px 10px 0; font-weight: 600; font-size: 14px; line-height: 1.3; }
ul.estaciones small { padding: 2px 10px 10px; color: var(--dim); font-size: 12px; }
@media (max-width: 720px) { .destacado { grid-template-columns: 1fr; } }