/* =========================================================
   Hoja de estilos compartida para todas las guías de clase
   (string.html, print.html, y las que se agreguen después)
   ========================================================= */

:root{
  --verde:#78b159;
  --verde2:#9acd7b;
  --azul:#133a63;
  --azul2:#1f4e80;
  --gris:#647182;
  --grisClaro:#eef3f6;
  --fondo:#f7faf8;
  --blanco:#ffffff;
  --texto:#133a63;
  --borde:#e2e8ee;
  --codigo:#0d1117;
  --amarillo:#ffd43b;
  --highlightBg:#eef9ea;
  --sombra:0 8px 25px rgba(0,0,0,.08);
}

:root[data-theme="dark"]{
  --fondo:#0e1521;
  --blanco:#161f2e;
  --texto:#e7ecf3;
  --gris:#94a2b6;
  --grisClaro:#1c2635;
  --borde:#2a3546;
  --highlightBg:rgba(120,177,89,.12);
  --sombra:0 8px 25px rgba(0,0,0,.45);
}

*{ margin:0; padding:0; box-sizing:border-box; }
html{ scroll-behavior:smooth; }
body{
  font-family:'DM Sans',sans-serif;
  background:var(--fondo);
  color:var(--texto);
  line-height:1.7;
  transition:background .25s,color .25s;
}
a{ text-decoration:none; color:inherit; }
code{ font-family:'JetBrains Mono',monospace; background:var(--grisClaro); padding:2px 6px; border-radius:4px; font-size:.92em; font-variant-ligatures:none; -webkit-font-feature-settings:"liga" 0,"calt" 0; font-feature-settings:"liga" 0,"calt" 0; }
pre code{ background:none; padding:0; border-radius:0; font-size:inherit; }
pre{ font-family:'JetBrains Mono',monospace; font-variant-ligatures:none; -webkit-font-feature-settings:"liga" 0,"calt" 0; font-feature-settings:"liga" 0,"calt" 0; }
img{ max-width:100%; }

/* SIDEBAR */
.sidebar{
  position:fixed; left:0; top:0; width:280px; height:100vh;
  background:var(--blanco); border-right:1px solid var(--borde);
  overflow:auto; padding:30px; z-index:600;
  transition:background .25s,border-color .25s;
}
.logo{ font-family:Fraunces,serif; font-size:26px; font-weight:bold; margin-bottom:10px; }
.logo span{ color:var(--verde); }
.sidebar > p{ color:var(--gris); font-size:14px; margin-bottom:20px; }

.buscador{ margin-bottom:20px; }
.buscador input{
  width:100%; padding:10px 12px; border:1px solid var(--borde); border-radius:8px;
  background:var(--fondo); color:var(--texto); font-family:'DM Sans',sans-serif; font-size:14px;
}
.buscador input:focus{ outline:2px solid var(--verde); }
.sin-resultados{ display:none; color:var(--gris); font-size:13px; padding:10px; }
.sin-resultados.show{ display:block; }

.menu{ display:flex; flex-direction:column; gap:6px; }
.menu a{ padding:10px; border-radius:8px; transition:.25s; font-weight:500; }
.menu a:hover{ background:var(--verde); color:white; }

.theme-btn{
  width:100%; margin-top:20px; padding:10px; border:1px solid var(--borde); border-radius:8px;
  background:var(--fondo); color:var(--texto); cursor:pointer; font-family:'DM Sans',sans-serif;
  font-size:14px; display:flex; align-items:center; justify-content:center; gap:8px;
}
.theme-btn:hover{ border-color:var(--verde); }

.menu-btn{
  display:none; position:fixed; top:15px; left:15px; z-index:900; width:44px; height:44px;
  border:none; border-radius:10px; background:var(--azul); color:white; font-size:20px;
  cursor:pointer; box-shadow:var(--sombra);
}
.sidebar-backdrop{ display:none; position:fixed; inset:0; background:rgba(0,0,0,.45); z-index:590; }
.sidebar-backdrop.show{ display:block; }

/* CONTENIDO */
.main{ margin-left:280px; }

/* HERO */
.hero{
  background:linear-gradient(135deg,var(--azul),var(--azul2));
  padding:70px; color:white; position:relative; overflow:hidden;
}
.hero::before{
  content:""; position:absolute; inset:0; opacity:.07;
  background-image:radial-gradient(circle at 25px 25px,#ffffff 2px,transparent 0);
  background-size:50px 50px;
}
.hero-content{ position:relative; z-index:2; max-width:900px; }
.badge{ display:inline-block; background:rgba(255,255,255,.12); padding:8px 18px; border-radius:40px; margin-bottom:20px; font-size:14px; }
.view-counter{ display:inline-flex; align-items:center; gap:6px; background:rgba(255,255,255,.12); padding:8px 18px; border-radius:40px; margin-bottom:20px; margin-left:10px; font-size:14px; }
.hero h1{ font-family:Fraunces,serif; font-size:58px; line-height:1.1; margin-bottom:20px; }
.hero h1 span{ color:var(--amarillo); }
.hero p{ font-size:20px; max-width:700px; opacity:.92; }
.author{ margin-top:30px; display:flex; align-items:center; gap:15px; }
.avatar{ width:50px; height:50px; background:var(--verde); border-radius:50%; display:flex; align-items:center; justify-content:center; font-weight:bold; }

/* SECCIONES */
.container{ max-width:1000px; margin:auto; padding:50px; }
.card{ background:var(--blanco); border-radius:18px; padding:35px; box-shadow:var(--sombra); margin-bottom:35px; transition:background .25s; }
.section-title{ font-family:Fraunces,serif; font-size:38px; margin-bottom:15px; }
.lead{ font-size:20px; color:var(--gris); margin-bottom:25px; }

.highlight{ background:var(--highlightBg); border-left:6px solid var(--verde); padding:20px; border-radius:8px; margin:30px 0; }

/* BLOQUES DE CÓDIGO — ejemplo (solo lectura) */
.code{ background:var(--codigo); border-radius:12px; overflow:hidden; margin:25px 0; }
.code:has(+ .editor-panel){ margin-bottom:0; border-radius:12px 12px 0 0; }
.code-header,.editor-header{
  padding:10px 20px; background:#010409; color:#9aa7b8; font-size:13px;
  display:flex; align-items:center; justify-content:space-between; gap:8px; flex-wrap:wrap;
}
.code pre{ padding:25px; color:#e6edf3; overflow:auto; font-size:15px; line-height:1.7; margin:0; user-select:none; -webkit-user-select:none; -ms-user-select:none; }
.code pre *{ user-select:none; -webkit-user-select:none; -ms-user-select:none; }
.code.salida pre{ color:#d7dee6; }

.code-btn{
  background:rgba(255,255,255,.08); border:1px solid rgba(255,255,255,.2); color:#eee;
  padding:5px 10px; border-radius:6px; font-size:12px; cursor:pointer; font-family:'DM Sans',sans-serif;
}
.code-btn:hover{ background:var(--verde); border-color:var(--verde); color:white; }
.code-btn.run{ background:var(--verde); border-color:var(--verde); color:white; }
.code-btn.run:hover{ background:var(--verde2); }
.code-btn:disabled{ opacity:.5; cursor:wait; }
.code-btn.stop{ background:rgba(255,255,255,.08); border-color:#e5484d; color:#ff8a8a; }
.code-btn.stop:hover{ background:#e5484d; border-color:#e5484d; color:white; }

/* BLOQUE DE CÓDIGO — editor en blanco del estudiante, separado del ejemplo */
.editor-panel{
  background:var(--codigo); border-radius:0 0 12px 12px; overflow:hidden; margin:0 0 25px;
  border-top:1px dashed rgba(255,255,255,.15);
}
.editor-panel.independiente{ border-radius:12px; border-top:none; margin:25px 0; }
.editor-panel.independiente .editor{ min-height:520px; }
.editor-header span{ color:var(--verde2); font-weight:500; }
.editor{
  width:100%; min-height:110px; background:var(--codigo); color:#e6edf3; border:none;
  padding:25px; font-family:'JetBrains Mono',monospace; font-size:15px; line-height:1.7;
  resize:vertical; display:block; font-variant-ligatures:none;
  -webkit-font-feature-settings:"liga" 0,"calt" 0; font-feature-settings:"liga" 0,"calt" 0;
}
.editor::placeholder{ color:#5b6472; font-style:italic; }
.editor:focus{ outline:2px solid var(--verde); outline-offset:-2px; }

.output{ border-top:1px solid rgba(255,255,255,.12); }
.output-head{ padding:10px 20px; background:#010409; color:#8fd48a; font-size:12px; letter-spacing:.5px; text-transform:uppercase; }
.output.error .output-head{ color:#ff8a8a; }
.output-body{ padding:20px 25px; margin:0; color:#e6edf3; font-family:'JetBrains Mono',monospace; font-size:14px; white-space:pre-wrap; word-break:break-word; font-variant-ligatures:none; -webkit-font-feature-settings:"liga" 0,"calt" 0; font-feature-settings:"liga" 0,"calt" 0; }
.output.error .output-body{ color:#ffb4b4; }

.string{ color:#a5d6ff; }
.keyword{ color:#ff7b72; }
.comment{ color:#8b949e; font-style:italic; }
.number{ color:#f2cc60; }
.func{ color:#d2a8ff; }

/* TABLAS */
.tabla{ width:100%; border-collapse:collapse; margin-top:10px; }
.tabla th,.tabla td{ padding:14px 15px; text-align:left; border:1px solid var(--borde); }
.tabla thead th{ background:var(--grisClaro); }

.tabla-indices{ width:100%; border-collapse:collapse; text-align:center; font-size:18px; }
.tabla-indices thead th{ background:var(--azul); color:white; padding:10px; }
.tabla-indices.neg thead th{ background:var(--verde); }
.tabla-indices td{ padding:18px; border:1px solid var(--borde); }

.info-grid{ display:grid; grid-template-columns:repeat(auto-fit,minmax(220px,1fr)); gap:20px; margin-top:35px; }
.info{ background:var(--blanco); padding:25px; border-radius:14px; box-shadow:var(--sombra); }
.info h3{ margin-bottom:10px; }
.info p{ color:var(--gris); }

footer{ padding:70px; text-align:center; color:var(--gris); }

.progress{ position:fixed; top:0; left:0; height:5px; background:var(--verde); width:0; z-index:1000; }

.top-btn{
  position:fixed; bottom:25px; right:25px; width:55px; height:55px; border:none; border-radius:50%;
  background:var(--verde); color:white; font-size:22px; cursor:pointer; box-shadow:0 5px 15px rgba(0,0,0,.25);
  opacity:0; pointer-events:none; transition:opacity .25s;
}
.top-btn.show{ opacity:1; pointer-events:auto; }

@media(max-width:900px){
  .menu-btn{ display:block; }
  .sidebar{ position:fixed; width:280px; height:100vh; transform:translateX(-100%); transition:transform .3s ease; }
  .sidebar.open{ transform:translateX(0); }
  .main{ margin-left:0; }
  .hero{ padding:70px 30px 40px; }
  .hero h1{ font-size:36px; }
  .container{ padding:25px; }
}

/* =========================================================
   ACTIVIDADES INTERACTIVAS (quiz): selección múltiple,
   verdadero/falso, emparejamiento, clasificación y completar.
   ========================================================= */
.quiz{ margin:28px 0; padding:22px 24px; border-radius:14px; background:var(--grisClaro); border:1px solid var(--borde); transition:background .25s,border-color .25s; }
.quiz-badge{ display:inline-block; font-size:12px; font-weight:700; letter-spacing:.5px; text-transform:uppercase; color:var(--verde); background:var(--highlightBg); padding:4px 10px; border-radius:20px; margin-bottom:12px; }
.quiz-q{ font-weight:600; margin-bottom:16px; font-size:16px; }

.quiz-opts{ display:flex; flex-direction:column; gap:10px; }
.quiz-opts.inline{ flex-direction:row; flex-wrap:wrap; }
.quiz-opt{
  text-align:left; padding:12px 16px; border-radius:10px; border:2px solid var(--borde);
  background:var(--blanco); color:var(--texto); cursor:pointer; font-family:'DM Sans',sans-serif;
  font-size:15px; transition:.2s; width:100%;
}
.quiz-opts.inline .quiz-opt{ width:auto; flex:1; text-align:center; min-width:120px; }
.quiz-opt:hover:not(:disabled){ border-color:var(--verde); }
.quiz-opt:disabled{ cursor:default; }
.quiz-opt.correct{ background:var(--highlightBg); border-color:var(--verde); color:var(--texto); font-weight:600; }
.quiz-opt.incorrect{ background:rgba(220,53,69,.1); border-color:#dc3545; }
.quiz-opt.correct::after{ content:" ✓"; color:var(--verde); font-weight:bold; }
.quiz-opt.incorrect::after{ content:" ✗"; color:#dc3545; font-weight:bold; }

.quiz-fb{ margin-top:16px; padding:14px 16px; border-radius:10px; font-size:14.5px; line-height:1.6; }
.quiz-fb.ok{ background:var(--highlightBg); border-left:4px solid var(--verde); }
.quiz-fb.ko{ background:rgba(220,53,69,.08); border-left:4px solid #dc3545; }

.quiz-match-grid{ display:grid; grid-template-columns:1fr 1fr; gap:12px 20px; }
.quiz-match-item{
  padding:12px 14px; border-radius:10px; border:2px solid var(--borde); background:var(--blanco);
  color:var(--texto); cursor:pointer; font-size:14.5px; text-align:left; width:100%; transition:.2s;
}
.quiz-match-item:hover:not(:disabled){ border-color:var(--verde); }
.quiz-match-item.selected{ border-color:var(--azul2); background:var(--highlightBg); }
.quiz-match-item.matched{ border-color:var(--verde); background:var(--highlightBg); cursor:default; opacity:.85; }
.quiz-match-item.wrong{ border-color:#dc3545; background:rgba(220,53,69,.08); }
.quiz-progress{ margin-top:14px; font-size:13px; color:var(--gris); }

.quiz-classify-row{
  display:flex; align-items:center; justify-content:space-between; gap:14px; flex-wrap:wrap;
  padding:12px 0; border-bottom:1px solid var(--borde);
}
.quiz-classify-row:last-child{ border-bottom:none; }
.quiz-classify-text{ font-size:15px; }
.quiz-classify-btns{ display:flex; gap:8px; flex-wrap:wrap; }
.quiz-classify-btns button{
  padding:8px 14px; border-radius:8px; border:2px solid var(--borde); background:var(--blanco);
  color:var(--texto); cursor:pointer; font-family:'DM Sans',sans-serif; font-size:13.5px;
}
.quiz-classify-btns button:hover:not(:disabled){ border-color:var(--verde); }
.quiz-classify-btns button.correct{ background:var(--highlightBg); border-color:var(--verde); font-weight:600; }
.quiz-classify-btns button.incorrect{ background:rgba(220,53,69,.1); border-color:#dc3545; }
.quiz-classify-btns button:disabled{ cursor:default; }
.quiz-classify-btns button:disabled.correct,.quiz-classify-btns button:disabled.incorrect{ opacity:1; }

.quiz-fill p{ margin-bottom:14px; font-size:15px; line-height:1.9; }
.quiz-blank{
  font-family:'DM Sans',sans-serif; font-size:14.5px; padding:4px 8px; border-radius:6px;
  border:2px solid var(--azul2); background:var(--blanco); color:var(--texto); margin:0 3px;
}
.quiz-blank.correct{ border-color:var(--verde); background:var(--highlightBg); }
.quiz-blank.incorrect{ border-color:#dc3545; background:rgba(220,53,69,.08); }

.quiz-open-input{
  width:100%; min-height:110px; margin:4px 0 14px; padding:14px 16px; border-radius:10px;
  border:1px solid var(--borde); background:var(--blanco); color:var(--texto);
  font-family:'DM Sans',sans-serif; font-size:14.5px; line-height:1.6; resize:vertical;
}
.quiz-open-input:focus{ outline:2px solid var(--verde); outline-offset:-2px; }
.quiz-open-model{ margin-top:14px; padding:14px 16px; border-radius:10px; background:var(--highlightBg); border-left:4px solid var(--verde); font-size:14.5px; line-height:1.6; }
.quiz-open-model strong{ display:block; margin-bottom:6px; }

.quiz-tracker{
  display:flex; align-items:center; gap:20px; flex-wrap:wrap;
  background:var(--highlightBg); border:1px solid var(--borde); border-radius:12px; padding:16px 20px; margin-bottom:30px;
}
.quiz-tracker-count{ font-size:24px; font-weight:700; color:var(--verde); white-space:nowrap; }
.quiz-tracker-label{ font-size:12.5px; color:var(--gris); }
.quiz-bar{ flex:1; min-width:150px; height:10px; background:var(--grisClaro); border-radius:6px; overflow:hidden; }
.quiz-bar-fill{ height:100%; background:var(--verde); width:0%; transition:width .4s; }

@media(max-width:640px){
  .quiz-match-grid{ grid-template-columns:1fr; }
}

/* =========================================================
   DIAGRAMA ETIQUETADO (SVG con marcas numeradas)
   ========================================================= */
.diagrama-er{ background:var(--blanco); border:1px solid var(--borde); border-radius:14px; padding:20px; margin:25px 0; overflow-x:auto; transition:background .25s,border-color .25s; }
.diagrama-er svg{ display:block; margin:0 auto; max-width:100%; height:auto; min-width:560px; }
.diagrama-er .er-entidad{ fill:var(--highlightBg); stroke:var(--azul2); stroke-width:2; }
.diagrama-er .er-debil{ fill:var(--highlightBg); stroke:var(--azul2); stroke-width:2; }
.diagrama-er .er-atributo{ fill:var(--blanco); stroke:var(--verde); stroke-width:2; }
.diagrama-er .er-relacion{ fill:var(--amarillo); fill-opacity:.25; stroke:#b8860b; stroke-width:2; }
.diagrama-er .er-linea{ stroke:var(--gris); stroke-width:1.5; }
.diagrama-er text{ fill:var(--texto); font-family:'DM Sans',sans-serif; }
.diagrama-er .er-marca circle{ fill:var(--verde); }
.diagrama-er .er-marca text{ fill:#ffffff; font-weight:700; font-size:13px; text-anchor:middle; dominant-baseline:central; }

/* =========================================================
   DIAGRAMA SVG GENÉRICO (línea de tiempo, ciclo en V, etc.)
   ========================================================= */
.diagrama-caja{ background:var(--blanco); border:1px solid var(--borde); border-radius:14px; padding:20px; margin:18px 0; overflow-x:auto; transition:background .25s,border-color .25s; }
.diagrama-caja svg{ display:block; margin:0 auto; max-width:100%; height:auto; }
.dg-linea{ stroke:var(--azul2); stroke-width:2.5; fill:none; }
.dg-conector{ stroke:var(--verde); stroke-width:2; stroke-dasharray:6 5; fill:none; }
.dg-nodo{ fill:var(--verde); }
.dg-nodo.vertice{ fill:var(--azul2); }
.dg-texto{ fill:var(--texto); font-family:'DM Sans',sans-serif; font-size:12px; font-weight:600; }
.dg-texto.small{ font-size:10.5px; font-weight:500; fill:var(--gris); }

/* =========================================================
   PRESENTACIÓN POR DIAPOSITIVAS (formato deck, alternativo
   al esqueleto lineal de sidebar + scroll). Ver guías con
   clase .deck en el <body> — piloto: ingenieria-de-sistemas.html
   ========================================================= */
html:has(body.deck-mode){ scroll-behavior:auto; overflow:hidden; }
body.deck-mode{ overflow:hidden; height:100vh; }

.deck-topbar{
  position:fixed; top:0; left:0; right:0; height:52px; z-index:800;
  display:flex; align-items:center; gap:14px; padding:0 18px;
  background:var(--blanco); border-bottom:1px solid var(--borde);
  transition:background .25s,border-color .25s;
}
.deck-progress-track{ flex:1; height:6px; background:var(--grisClaro); border-radius:6px; overflow:hidden; }
.deck-progress-fill{ height:100%; background:var(--verde); width:0%; transition:width .3s ease; }
.deck-counter{ font-family:'JetBrains Mono',monospace; font-size:13px; color:var(--gris); white-space:nowrap; min-width:52px; text-align:right; }
.deck-icon-btn{
  width:34px; height:34px; flex:none; border:1px solid var(--borde); border-radius:9px;
  background:var(--fondo); color:var(--texto); cursor:pointer; font-size:15px;
  display:flex; align-items:center; justify-content:center; transition:.2s;
}
.deck-icon-btn:hover{ border-color:var(--verde); }

.deck-viewport{ position:fixed; top:52px; bottom:0; left:0; right:0; overflow:hidden; }

.slide{
  position:absolute; inset:0; display:flex; flex-direction:column; align-items:center;
  justify-content:center; overflow-y:auto; padding:40px 8vw 90px; opacity:0; pointer-events:none;
  transition:opacity .25s ease; text-align:left;
}
.slide.active{ opacity:1; pointer-events:auto; }
@media(prefers-reduced-motion:reduce){ .slide{ transition:none; } }

.slide-inner{ max-width:900px; width:100%; margin:auto; }
.slide-kicker{
  font-family:'DM Sans',sans-serif; font-size:13px; font-weight:700; letter-spacing:.08em;
  text-transform:uppercase; color:var(--verde); margin-bottom:14px;
}
.slide-title{ font-family:Fraunces,serif; font-size:clamp(28px,4.2vw,46px); line-height:1.15; margin-bottom:18px; }
.slide-title span{ color:var(--verde); }
.slide-lead{ font-size:clamp(16px,2vw,20px); color:var(--gris); line-height:1.6; margin-bottom:14px; }
.slide-body p{ font-size:17px; line-height:1.75; margin-bottom:14px; }
.slide-body ul,.slide-body ol{ margin:0 0 14px 22px; font-size:17px; line-height:1.8; }
.slide-body strong{ color:var(--texto); }

.slide.slide-title-slide{ text-align:center; }
.slide.slide-title-slide .slide-inner{ display:flex; flex-direction:column; align-items:center; }
.slide-eyebrow{
  display:inline-block; background:var(--highlightBg); color:var(--verde); font-weight:700;
  font-size:13px; letter-spacing:.06em; text-transform:uppercase; padding:8px 18px; border-radius:40px; margin-bottom:22px;
}
.slide-hint{ margin-top:34px; font-size:14px; color:var(--gris); }

.slide.slide-divider{ text-align:center; }
.slide-divider .slide-num{
  font-family:'JetBrains Mono',monospace; font-size:15px; color:var(--verde); margin-bottom:10px; letter-spacing:.05em;
}
.slide-divider .slide-title{ font-size:clamp(30px,5vw,52px); }

.slide-visual{ margin:18px 0; width:100%; display:flex; justify-content:center; }
.slide-visual svg{ max-width:100%; height:auto; }

.slide .card{ box-shadow:none; }
.slide .highlight{ margin:18px 0; }
.slide .tabla{ font-size:15px; }
.slide .quiz{ margin:18px 0; width:100%; }
.slide .info-grid{ margin-top:20px; }

.deck-nav-btn{
  position:fixed; bottom:22px; z-index:800; width:52px; height:52px; border:none; border-radius:50%;
  background:var(--verde); color:white; font-size:22px; cursor:pointer; box-shadow:var(--sombra);
  display:flex; align-items:center; justify-content:center; transition:opacity .2s,transform .2s;
}
.deck-nav-btn:hover{ transform:scale(1.06); }
.deck-nav-btn:disabled{ opacity:.35; cursor:default; transform:none; }
.deck-nav-prev{ left:22px; }
.deck-nav-next{ right:22px; }

.deck-menu-overlay{ display:none; position:fixed; inset:0; background:rgba(0,0,0,.45); z-index:890; }
.deck-menu-overlay.show{ display:block; }
.deck-menu-panel{
  position:fixed; top:0; left:0; bottom:0; width:300px; max-width:82vw; background:var(--blanco);
  z-index:891; padding:26px 22px; overflow:auto; transform:translateX(-100%); transition:transform .25s ease;
  border-right:1px solid var(--borde);
}
.deck-menu-panel.show{ transform:translateX(0); }
.deck-menu-panel h3{ font-family:Fraunces,serif; font-size:20px; margin-bottom:16px; }
.deck-menu-list{ display:flex; flex-direction:column; gap:6px; }
.deck-menu-list button{
  text-align:left; padding:10px 12px; border-radius:8px; border:none; background:none; color:var(--texto);
  cursor:pointer; font-family:'DM Sans',sans-serif; font-size:14.5px; transition:.2s;
}
.deck-menu-list button:hover,.deck-menu-list button.current{ background:var(--highlightBg); color:var(--verde); font-weight:600; }

@media(max-width:640px){
  .slide{ padding:28px 6vw 100px; }
  .slide-body p,.slide-body ul,.slide-body ol{ font-size:15.5px; }
  .deck-nav-btn{ width:46px; height:46px; font-size:19px; bottom:16px; }
  .deck-nav-prev{ left:14px; }
  .deck-nav-next{ right:14px; }
}

/* =========================================================
   FLUJO CON PANEL FIJO (formato deck, alternativo #2 al
   esqueleto lineal — piloto: guias_bd/joins-subconsultas.html).
   Nivel 1 completo: sin sidebar en toda la guía, reemplazado
   por una topbar fija (marca + progreso + menú + tema), igual
   de comprometido con su propia identidad que .deck-* arriba.
   Body scrollea normal (a diferencia de .deck-mode, que fija
   el viewport): la narrativa entera es un scroll continuo de
   dos columnas — prosa a la izquierda (.flow-beat) y un panel
   fijo a la derecha (.flow-panel) que se redibuja según qué
   .flow-beat cruza el centro del viewport. Después del tramo
   explicativo, la guía puede pasar a .flow-flat (una columna,
   sin panel) para quizzes, tablas de referencia y cierre.
   ========================================================= */
body.flow-mode{ background:var(--fondo); }
.flow-topbar{
  position:fixed; top:0; left:0; right:0; height:56px; z-index:800;
  display:flex; align-items:center; gap:14px; padding:0 18px;
  background:var(--blanco); border-bottom:1px solid var(--borde);
  transition:background .25s,border-color .25s;
}
.flow-brand{ font-family:Fraunces,serif; font-weight:700; font-size:16px; white-space:nowrap; }
.flow-brand span{ color:var(--verde); }
.flow-progress-track{ flex:1; height:6px; background:var(--grisClaro); border-radius:6px; overflow:hidden; }
.flow-progress-fill{ height:100%; background:var(--verde); width:0%; }
.flow-icon-btn{
  width:34px; height:34px; flex:none; border:1px solid var(--borde); border-radius:9px;
  background:var(--fondo); color:var(--texto); cursor:pointer; font-size:15px;
  display:flex; align-items:center; justify-content:center; transition:.2s;
}
.flow-icon-btn:hover{ border-color:var(--verde); }

.flow-menu-overlay{ display:none; position:fixed; inset:0; background:rgba(0,0,0,.45); z-index:890; }
.flow-menu-overlay.show{ display:block; }
.flow-menu-panel{
  position:fixed; top:0; left:0; bottom:0; width:300px; max-width:82vw; background:var(--blanco);
  z-index:891; padding:26px 22px; overflow:auto; transform:translateX(-100%); transition:transform .25s ease;
  border-right:1px solid var(--borde);
}
.flow-menu-panel.show{ transform:translateX(0); }
.flow-menu-panel h3{ font-family:Fraunces,serif; font-size:20px; margin-bottom:16px; }
.flow-menu-list{ display:flex; flex-direction:column; gap:6px; }
.flow-menu-list button{
  text-align:left; padding:10px 12px; border-radius:8px; border:none; background:none; color:var(--texto);
  cursor:pointer; font-family:'DM Sans',sans-serif; font-size:14.5px; transition:.2s;
}
.flow-menu-list button:hover,.flow-menu-list button.current{ background:var(--highlightBg); color:var(--verde); font-weight:600; }

.flow-body{ padding-top:56px; }
.flow-intro{ max-width:900px; margin:0 auto; padding:60px 40px 36px; }
.flow-badge{ display:inline-block; background:var(--highlightBg); color:var(--verde); font-weight:700; font-size:12px; letter-spacing:.04em; padding:6px 14px; border-radius:20px; margin-bottom:22px; }
.flow-h1{ font-family:Fraunces,serif; font-weight:700; font-size:clamp(30px,4.4vw,46px); line-height:1.14; margin-bottom:20px; }
.flow-h1 span{ color:var(--verde); }
.flow-lead{ font-size:18px; opacity:.88; line-height:1.65; margin-bottom:14px; max-width:64ch; }
.flow-sub{ font-size:14.5px; color:var(--gris); max-width:64ch; }
.flow-author{ margin-top:26px; display:flex; align-items:center; gap:14px; }

.flow-section{ max-width:1240px; margin:0 auto; padding:6px 40px 20px; }
.flow-grid{ display:grid; grid-template-columns:1.15fr .95fr; gap:56px; align-items:start; }
.flow-beats{ border-left:2px solid var(--borde); padding-left:30px; display:flex; flex-direction:column; }
.flow-beat{ position:relative; min-height:68vh; display:flex; flex-direction:column; justify-content:center; padding:32px 0; opacity:.4; transition:opacity .3s ease; }
.flow-beat.is-active{ opacity:1; }
.flow-beat::before{ content:""; position:absolute; left:-37px; top:38px; width:10px; height:10px; border-radius:50%; background:var(--borde); transition:background .3s ease,box-shadow .3s ease; }
.flow-beat.is-active::before{ background:var(--verde); box-shadow:0 0 0 4px var(--highlightBg); }
.flow-beat:last-child{ min-height:38vh; }
.flow-beat-eyebrow{ display:block; font-size:12px; font-weight:700; letter-spacing:.05em; text-transform:uppercase; color:var(--verde); margin-bottom:10px; }
.flow-beat h3{ font-family:Fraunces,serif; font-size:26px; margin-bottom:12px; }
.flow-beat p{ font-size:16px; opacity:.92; max-width:56ch; margin-bottom:10px; }
.flow-beat p:last-child{ margin-bottom:0; }

.flow-panel-wrap{ position:sticky; top:76px; }
.flow-panel{ background:var(--blanco); border:1px solid var(--borde); border-radius:16px; box-shadow:var(--sombra); padding:20px; max-height:calc(100vh - 116px); overflow-y:auto; transition:background .25s,border-color .25s; }
.flow-panel-head{ display:flex; align-items:center; justify-content:space-between; margin-bottom:12px; }
.flow-panel-head span:first-child{ font-weight:700; font-size:13px; }
.flow-panel-step{ font-family:'JetBrains Mono',monospace; font-size:11px; color:var(--verde); background:var(--highlightBg); padding:3px 9px; border-radius:20px; }

.flow-divider{ max-width:820px; margin:14px auto; padding:0 40px; text-align:center; }
.flow-flat{ max-width:820px; margin:0 auto; padding:6px 40px 40px; }
.flow-flat h2{ font-family:Fraunces,serif; font-size:32px; margin-bottom:14px; }
.flow-flat .lead{ font-size:17px; color:var(--gris); margin-bottom:22px; }
.flow-flat .tabla{ margin-bottom:10px; }

@media(max-width:900px){
  .flow-grid{ grid-template-columns:1fr; gap:0; }
  .flow-panel-wrap{ position:sticky; top:64px; z-index:5; margin:0 0 18px; }
  .flow-panel{ max-height:none; }
  .flow-beat{ min-height:48vh; }
  .flow-intro,.flow-section,.flow-flat,.flow-divider{ padding-left:22px; padding-right:22px; }
}
@media(max-width:520px){
  .flow-h1{ font-size:27px; }
}

/* =========================================================
   SCROLLYTELLING ACOTADO A UNA SECCIÓN (Nivel 2 — aún sin
   pilotar; candidato: ISW, una sección donde la arquitectura
   evoluciona con cada decisión de diseño. Ver .flow-* arriba
   para el Nivel 1 completo, que sí tiene piloto en BD2).
   Prosa a la izquierda + panel fijo a la derecha que se
   actualiza vía IntersectionObserver mientras se scrollea.
   No cambia la navegación general de la guía (sigue siendo
   sidebar + scroll) — solo el tramo envuelto en .scrolly-section.
   ========================================================= */
.scrolly-section{ margin:34px 0 10px; }
.scrolly-grid{ display:grid; grid-template-columns:1.15fr .95fr; gap:40px; align-items:start; }
.scrolly-steps{ border-left:2px solid var(--borde); padding-left:26px; display:flex; flex-direction:column; }
.scrolly-step{ position:relative; min-height:62vh; display:flex; flex-direction:column; justify-content:center; padding:26px 0; opacity:.4; transition:opacity .3s ease; }
.scrolly-step.is-active{ opacity:1; }
.scrolly-step::before{ content:""; position:absolute; left:-33px; top:6px; width:10px; height:10px; border-radius:50%; background:var(--borde); transition:background .3s ease,box-shadow .3s ease; }
.scrolly-step.is-active::before{ background:var(--verde); box-shadow:0 0 0 4px var(--highlightBg); }
.scrolly-step:last-child{ min-height:30vh; }
.scrolly-step-eyebrow{ display:block; font-size:11.5px; font-weight:700; letter-spacing:.05em; text-transform:uppercase; color:var(--verde); margin-bottom:8px; }
.scrolly-step h3{ font-family:Fraunces,serif; font-size:22px; margin-bottom:10px; }
.scrolly-step p{ font-size:15.5px; margin-bottom:8px; }
.scrolly-step p:last-child{ margin-bottom:0; }

.scrolly-panel-wrap{ position:sticky; top:20px; }
.scrolly-panel{ background:var(--fondo); border:1px solid var(--borde); border-radius:16px; padding:18px; max-height:calc(100vh - 40px); overflow-y:auto; transition:background .25s,border-color .25s; }
.scrolly-panel-head{ display:flex; align-items:center; justify-content:space-between; margin-bottom:12px; }
.scrolly-panel-head span:first-child{ font-weight:700; font-size:13px; }
.scrolly-panel-step{ font-family:'JetBrains Mono',monospace; font-size:11px; color:var(--verde); background:var(--highlightBg); padding:3px 9px; border-radius:20px; }

.scrolly-dg-wrap{ border:1px solid var(--borde); border-radius:10px; padding:10px 8px 8px; margin-bottom:14px; background:var(--blanco); }
.scrolly-dg-wrap svg{ width:100%; height:auto; display:block; }
.scrolly-dg-caption{ font-size:10.5px; color:var(--gris); text-align:center; margin-top:4px; }
.scrolly-edge{ stroke:var(--borde); stroke-width:1.6; transition:stroke .3s ease,opacity .3s ease; }
.scrolly-edge.active{ stroke:var(--verde); stroke-width:2.2; }
.scrolly-edge.dim{ opacity:.22; }
line.scrolly-ghost{ stroke:var(--gris); stroke-width:1.3; stroke-dasharray:3 3; }
circle.scrolly-ghost{ fill:none; stroke:var(--gris); stroke-width:1.3; stroke-dasharray:2 2; }
text.scrolly-ghost{ font-family:'JetBrains Mono',monospace; font-size:8px; fill:var(--gris); text-anchor:middle; }
.scrolly-ghost{ opacity:0; transition:opacity .3s ease; }
.scrolly-ghost.show{ opacity:1; }
.scrolly-node-c circle{ fill:var(--blanco); stroke:var(--azul2); stroke-width:1.8; transition:fill .3s ease,stroke .3s ease,opacity .3s ease; }
.scrolly-node-c text{ font-family:'JetBrains Mono',monospace; font-size:9px; font-weight:700; fill:var(--texto); text-anchor:end; }
.scrolly-node-c.active circle{ fill:var(--verde); stroke:var(--verde); }
.scrolly-node-c.dim{ opacity:.3; }
.scrolly-node-p circle{ fill:var(--blanco); stroke:var(--gris); stroke-width:1.4; transition:fill .3s ease,stroke .3s ease,opacity .3s ease; }
.scrolly-node-p text{ font-family:'JetBrains Mono',monospace; font-size:8px; fill:var(--gris); text-anchor:start; }
.scrolly-node-p.active circle{ fill:var(--verde2); stroke:var(--verde); }
.scrolly-node-p.dim{ opacity:.25; }

.scrolly-query{ background:var(--codigo); border-radius:10px; overflow:hidden; margin-bottom:14px; }
.scrolly-query-head{ padding:7px 14px; background:#010409; color:#8b95a5; font-size:11px; font-family:'JetBrains Mono',monospace; }
.scrolly-query-pre{ padding:14px 16px; font-family:'JetBrains Mono',monospace; font-size:13px; line-height:1.85; color:#e6edf3; overflow-x:auto; margin:0; }
.scrolly-query-placeholder{ color:#5b6472; font-style:italic; }
.scrolly-qline{ white-space:pre; padding:1px 8px; margin:0 -8px; border-radius:5px; border-left:3px solid transparent; }
.scrolly-qline.is-new{ background:rgba(255,212,59,.18); border-left-color:#c99400; }

.scrolly-result-empty{ font-size:13px; color:var(--gris); padding:10px 4px; }
.scrolly-result-table{ width:100%; border-collapse:collapse; font-size:12.5px; }
.scrolly-result-table th{ text-align:left; padding:6px 8px; background:var(--grisClaro); font-size:10.5px; letter-spacing:.03em; text-transform:uppercase; color:var(--gris); font-weight:600; }
.scrolly-result-table td{ padding:7px 8px; border-bottom:1px solid var(--borde); }
.scrolly-result-table tbody tr:last-child td{ border-bottom:none; }
.scrolly-null{ color:var(--gris); font-style:italic; font-family:'JetBrains Mono',monospace; font-size:11px; }
.scrolly-result-count{ font-size:11px; color:var(--gris); margin-top:8px; text-align:right; }

@media(max-width:900px){
  .scrolly-grid{ grid-template-columns:1fr; gap:0; }
  .scrolly-panel-wrap{ position:sticky; top:10px; z-index:5; margin-bottom:16px; }
  .scrolly-panel{ max-height:none; }
  .scrolly-dg-caption{ display:none; }
  .scrolly-step{ min-height:42vh; }
}

/* Diagrama de Venn reutilizable (comparar tipos de JOIN u otras
   relaciones de conjuntos en un Cheat Sheet o sección de orientación) */
.venn-grid{ display:grid; grid-template-columns:repeat(auto-fit,minmax(130px,1fr)); gap:20px; margin-top:18px; }
.venn-item{ text-align:center; }
.venn-item svg{ width:100%; max-width:150px; height:auto; }
.venn-item span{ display:block; margin-top:8px; font-family:'JetBrains Mono',monospace; font-size:11.5px; font-weight:600; color:var(--texto); }
.venn-outline{ fill:none; stroke:var(--azul2); stroke-width:2; }
.venn-fill{ fill:var(--verde); fill-opacity:.55; stroke:none; }