/* ==========================================================================
   Laboratorio de Ciberseguridad — "terminal de laboratorio de análisis"
   Design system con custom properties. Sin recursos externos.
   Contraste: texto >= 4.5:1, bordes de controles/estados >= 3:1.
   ========================================================================== */

:root {
  color-scheme: dark;

  /* superficies */
  --bg: #0a0e14;
  --bg-1: #0f141c;
  --bg-2: #151c27;
  --bg-3: #1c2532;
  /* bordes: --line decorativo, --line-strong para controles (>= 3:1) */
  --line: #263041;
  --line-strong: #62748a;
  /* texto */
  --text: #d6e2e0;
  --muted: #98a8b8;
  --faint: #7f90a2;
  /* acentos */
  --accent: #3ddc84;        /* verde fósforo */
  --accent-ink: #04140a;    /* texto sobre fondo accent */
  --amber: #ffb454;         /* secundario */
  --danger: #ff7b7b;
  --link: #7fd4ff;
  --mark-bg: #ffb454;
  --mark-ink: #1a1000;

  /* tipografía */
  --font-mono: "Cascadia Code", "JetBrains Mono", ui-monospace, "SF Mono", Consolas, "Liberation Mono", monospace;
  --font-body: "Segoe UI", -apple-system, BlinkMacSystemFont, "Helvetica Neue", "Noto Sans", Ubuntu, Cantarell, Roboto, sans-serif;

  /* medidas */
  --header-h: 56px;
  --sidebar-w: 304px;
  --radius: 6px;
  --measure: 75ch;
  --mod: var(--accent); /* color del módulo en contexto */
}

*, *::before, *::after { box-sizing: border-box; }

html { scroll-padding-top: calc(var(--header-h) + 16px); -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 var(--font-body);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

/* textura: scanlines casi imperceptibles (CSS puro) */
body::after {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 100;
  background: repeating-linear-gradient(to bottom, rgba(255, 255, 255, 0.022) 0 1px, transparent 1px 3px);
}

a { color: var(--link); text-underline-offset: 3px; }
a:hover { color: #b4e5ff; }

:focus-visible { outline: 2px solid var(--amber); outline-offset: 2px; border-radius: 3px; }

.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;
}

.skip-link {
  position: fixed; left: 12px; top: -80px; z-index: 200;
  background: var(--accent); color: var(--accent-ink);
  font: 600 14px var(--font-mono); padding: 10px 14px; border-radius: var(--radius);
  text-decoration: none; transition: top .15s;
}
.skip-link:focus { top: 10px; }

kbd {
  font: 12px var(--font-mono);
  border: 1px solid var(--line-strong); border-radius: 4px;
  padding: 1px 6px; color: var(--muted); background: var(--bg-2);
}

/* ---------- Cabecera ---------- */
.topbar {
  position: sticky; top: 0; z-index: 40;
  height: var(--header-h);
  display: flex; align-items: center; gap: 12px;
  padding: 0 16px;
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--line);
}
.brand {
  display: inline-flex; align-items: center; gap: 10px;
  font: 700 15px var(--font-mono); color: var(--text); text-decoration: none; white-space: nowrap;
}
.brand-prompt { color: var(--accent); }
.brand-cursor {
  display: inline-block; width: 8px; height: 16px; background: var(--accent);
  animation: blink 1.1s steps(1) infinite;
}
.brand small { color: var(--muted); font-weight: 400; }

.search { margin-left: auto; position: relative; flex: 0 1 380px; width: 100%; }
.search input, .side-search input {
  width: 100%; height: 38px;
  background: var(--bg-1); color: var(--text);
  border: 1px solid var(--line-strong); border-radius: var(--radius);
  padding: 0 40px 0 34px;
  font: 14px var(--font-mono);
}
.search input::placeholder, .side-search input::placeholder { color: var(--faint); }
.search input:focus-visible, .side-search input:focus-visible { outline: 2px solid var(--amber); outline-offset: 1px; }
.search .ico, .side-search .ico {
  position: absolute; left: 11px; top: 50%; transform: translateY(-50%);
  color: var(--accent); font: 700 14px var(--font-mono); pointer-events: none;
}
.search kbd { position: absolute; right: 8px; top: 50%; transform: translateY(-50%); pointer-events: none; }

.icon-btn {
  display: none; align-items: center; justify-content: center;
  width: 40px; height: 40px; flex: none;
  background: var(--bg-1); color: var(--text);
  border: 1px solid var(--line-strong); border-radius: var(--radius); cursor: pointer;
}
.icon-btn svg { width: 20px; height: 20px; }

/* ---------- Estructura ---------- */
.shell { display: flex; align-items: flex-start; }

.sidebar {
  position: sticky; top: var(--header-h);
  flex: none; width: var(--sidebar-w);
  height: calc(100vh - var(--header-h));
  height: calc(100dvh - var(--header-h));
  overflow-y: auto; overscroll-behavior: contain;
  padding: 16px 14px 32px;
  background: var(--bg-1);
  border-right: 1px solid var(--line);
}
.side-search { position: relative; margin-bottom: 14px; }

.side-progress { margin: 0 0 16px; font: 12px var(--font-mono); color: var(--muted); }
.side-progress .row { display: flex; justify-content: space-between; margin-bottom: 6px; }

main {
  flex: 1 1 auto; min-width: 0;
  padding: 32px clamp(16px, 4vw, 56px) 80px;
}
main:focus { outline: none; }

/* ---------- Barras de progreso (forma + texto, no solo color) ---------- */
.bar {
  height: 10px; border: 1px solid var(--line-strong); border-radius: 99px;
  background: var(--bg); overflow: hidden;
}
.bar > span {
  display: block; height: 100%; background: var(--accent); border-radius: 99px;
  background-image: repeating-linear-gradient(135deg, rgba(0,0,0,.28) 0 4px, transparent 4px 8px);
  transition: width .35s ease;
}
.bar.amber > span { background-color: var(--amber); }

/* ---------- Navegación de módulos ---------- */
.mod { margin: 0 0 4px; border-radius: var(--radius); }
.mod > summary {
  list-style: none; cursor: pointer;
  display: flex; align-items: center; gap: 10px;
  padding: 8px 8px; border-radius: var(--radius);
  font: 600 13px var(--font-mono); color: var(--text);
}
.mod > summary::-webkit-details-marker { display: none; }
.mod > summary:hover { background: var(--bg-2); }
.mod > summary .chev { color: var(--muted); transition: transform .15s; width: 10px; flex: none; }
.mod[open] > summary .chev { transform: rotate(90deg); }
.mod > summary .count { margin-left: auto; color: var(--muted); font-weight: 400; }
.swatch {
  display: inline-flex; align-items: center; justify-content: center;
  min-width: 28px; height: 20px; padding: 0 4px;
  border: 1px solid var(--mod); border-radius: 3px;
  color: var(--mod); font: 700 11px var(--font-mono); flex: none;
}
.mod ul { list-style: none; margin: 2px 0 8px 14px; padding: 0 0 0 10px; border-left: 1px solid var(--line-strong); }
.mod li a {
  display: flex; align-items: flex-start; gap: 8px;
  padding: 6px 8px; border-radius: 4px;
  color: var(--muted); text-decoration: none; font-size: 13.5px; line-height: 1.35;
  border-left: 3px solid transparent; margin-left: -1px;
}
.mod li a:hover { background: var(--bg-2); color: var(--text); }
.mod li a[aria-current="page"] {
  background: var(--bg-3); color: var(--text); font-weight: 700; border-left-color: var(--mod);
}
.st { flex: none; width: 16px; font: 700 13px/1.35 var(--font-mono); text-align: center; color: var(--faint); }
.st.done { color: var(--accent); }
.mini-stars { margin-left: auto; flex: none; font: 11px/1.6 var(--font-mono); color: var(--amber); letter-spacing: -1px; white-space: nowrap; }

/* ---------- Tarjetas "consola" ---------- */
.term {
  position: relative;
  background: var(--bg-1);
  border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden;
}
.term-bar {
  display: flex; align-items: center; gap: 6px;
  padding: 7px 12px;
  background: var(--bg-2); border-bottom: 1px solid var(--line);
  font: 12px var(--font-mono); color: var(--muted);
}
.term-bar i { width: 9px; height: 9px; border-radius: 50%; background: var(--line-strong); flex: none; }
.term-bar i:nth-child(1) { background: #ff7b7b; }
.term-bar i:nth-child(2) { background: var(--amber); }
.term-bar i:nth-child(3) { background: var(--accent); }
.term-bar span { margin-left: 8px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.term-body { padding: 16px; }
.term.accent-top { border-top: 3px solid var(--mod); }

/* ---------- Vista inicio ---------- */
.home { max-width: 1100px; margin: 0 auto; }
.hero .term-body { padding: 28px clamp(16px, 3vw, 36px) 32px; }
.prompt { font: 14px var(--font-mono); color: var(--muted); margin: 0 0 14px; }
.prompt b { color: var(--accent); font-weight: 700; }
.hero h1 {
  font: 800 clamp(28px, 4.4vw, 46px)/1.1 var(--font-mono);
  margin: 0 0 12px; letter-spacing: -0.02em;
}
.hero h1 em { font-style: normal; color: var(--accent); }
.hero .lead { max-width: 62ch; color: var(--muted); font-size: 17px; margin: 0 0 24px; }
.stats { display: flex; flex-wrap: wrap; gap: 12px; margin: 0 0 24px; padding: 0; list-style: none; }
.stats li {
  min-width: 120px; padding: 10px 16px;
  border: 1px solid var(--line-strong); border-radius: var(--radius);
  background: var(--bg);
}
.stats strong { display: block; font: 800 30px/1.1 var(--font-mono); color: var(--amber); }
.stats span { font: 12px var(--font-mono); color: var(--muted); text-transform: uppercase; letter-spacing: .06em; }

.global-progress .row { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px; font: 13px var(--font-mono); margin-bottom: 8px; }

.continue {
  display: flex; align-items: center; gap: 16px; flex-wrap: wrap;
  margin-top: 24px; padding: 14px 16px;
  border: 1px dashed var(--accent); border-radius: var(--radius); background: var(--bg);
}
.continue .lbl { font: 700 12px var(--font-mono); color: var(--accent); text-transform: uppercase; letter-spacing: .08em; }
.continue .ttl { font-weight: 600; flex: 1 1 240px; }
.continue .ttl small { display: block; color: var(--muted); font: 12px var(--font-mono); margin-top: 2px; }

.btn {
  display: inline-flex; align-items: center; gap: 8px;
  min-height: 40px; padding: 8px 16px; cursor: pointer;
  font: 700 13px var(--font-mono); text-decoration: none;
  border: 1px solid var(--line-strong); border-radius: var(--radius);
  background: var(--bg-2); color: var(--text);
}
.btn:hover { background: var(--bg-3); color: var(--text); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.btn.primary:hover { background: #66ea9e; color: var(--accent-ink); }
.btn.danger { border-color: var(--danger); color: var(--danger); }
.btn.danger.solid { background: var(--danger); color: #1c0606; }
.btn.is-done { border-color: var(--accent); color: var(--accent); background: color-mix(in srgb, var(--accent) 12%, var(--bg-2)); }

.section-title {
  display: flex; align-items: baseline; gap: 12px;
  font: 700 18px var(--font-mono); margin: 44px 0 16px;
}
.section-title::before { content: "//"; color: var(--accent); }
.section-title small { color: var(--muted); font-weight: 400; font-size: 13px; }

.cards { display: grid; gap: 16px; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); }
.card h3 { font: 700 17px/1.3 var(--font-mono); margin: 0 0 6px; }
.card p { margin: 0 0 12px; color: var(--muted); font-size: 14.5px; }
.card .meta { font: 12px var(--font-mono); color: var(--muted); display: flex; justify-content: space-between; gap: 8px; margin-bottom: 6px; }
.card .btn { margin-top: 12px; }
.card.term { display: flex; flex-direction: column; height: 100%; }
.card .term-body { display: flex; flex-direction: column; flex: 1; }
.card .term-body > .push { margin-top: auto; }
.mod-card { text-decoration: none; color: inherit; display: block; height: 100%; }
.mod-card:hover .term { border-color: var(--mod); }
.mod-card .big { font: 800 34px/1 var(--font-mono); color: var(--mod); margin-bottom: 8px; }

/* animación de entrada: SOLO en la vista inicio */
.home.anim .rise { animation: rise .55s cubic-bezier(.2, .7, .2, 1) both; animation-delay: calc(var(--i, 0) * 70ms); }

@keyframes rise { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: none; } }
@keyframes blink { 50% { opacity: 0; } }

/* ---------- Vista lección ---------- */
.lesson-page { max-width: 1180px; margin: 0 auto; }
.crumbs { font: 13px var(--font-mono); color: var(--muted); margin-bottom: 16px; }
.crumbs ol { display: flex; flex-wrap: wrap; gap: 6px; margin: 0; padding: 0; list-style: none; }
.crumbs li + li::before { content: "›"; margin-right: 6px; color: var(--faint); }
.crumbs a { color: var(--muted); }
.crumbs [aria-current] { color: var(--text); }

.lesson-head { margin-bottom: 28px; }
.chip {
  display: inline-flex; align-items: center; gap: 8px;
  font: 700 12px var(--font-mono); letter-spacing: .04em;
  padding: 3px 10px; border: 1px solid var(--mod); border-radius: 99px; color: var(--text);
  background: color-mix(in srgb, var(--mod) 14%, var(--bg));
  text-decoration: none;
}
.chip b { color: var(--mod); }
.lesson-head h1 { font: 800 clamp(24px, 3.2vw, 36px)/1.2 var(--font-mono); margin: 14px 0 18px; letter-spacing: -0.01em; max-width: 40ch; }
.eyebrow { font: 12px var(--font-mono); color: var(--muted); margin-left: 6px; }
.facts { display: flex; flex-wrap: wrap; gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; margin: 0; }
.facts div { background: var(--bg-1); padding: 12px 14px; flex: 1 1 220px; }
.facts div.wide { flex-basis: 100%; }
.facts dt { font: 700 11px var(--font-mono); color: var(--amber); text-transform: uppercase; letter-spacing: .08em; margin-bottom: 4px; }
.facts dd { margin: 0; font-size: 15px; }
.stars { font-family: var(--font-mono); color: var(--amber); letter-spacing: 1px; }
.stars .off { color: var(--faint); }

.lesson-layout { display: grid; grid-template-columns: minmax(0, 1fr) 240px; gap: 40px; align-items: start; }

.toc {
  position: sticky; top: calc(var(--header-h) + 20px);
  max-height: calc(100vh - var(--header-h) - 40px); overflow-y: auto;
  scroll-target-group: auto;
  font-size: 13.5px;
}
.toc h2 { font: 700 11px var(--font-mono); color: var(--amber); text-transform: uppercase; letter-spacing: .1em; margin: 0 0 10px; }
.toc ol { list-style: none; margin: 0; padding: 0; border-left: 1px solid var(--line-strong); }
.toc a {
  display: block; padding: 5px 10px 5px 12px; margin-left: -1px;
  border-left: 3px solid transparent;
  color: var(--muted); text-decoration: none; line-height: 1.35;
}
.toc a:hover { color: var(--text); background: var(--bg-2); }
.toc a .n { font-family: var(--font-mono); color: var(--faint); margin-right: 6px; }
/* estado activo: color + peso + barra lateral + marcador (no solo color) */
.toc a:is(:target-current, .\:target-current) {
  color: var(--text); font-weight: 700; border-left-color: var(--accent); background: var(--bg-2);
}
.toc a:is(:target-current, .\:target-current)::after { content: " ◀"; color: var(--accent); font-size: 10px; }

/* ---------- Contenido de lección ---------- */
.lesson-body { font-size: 16.5px; line-height: 1.7; }
.lesson-body section { scroll-margin-top: calc(var(--header-h) + 16px); margin-bottom: 40px; }
.lesson-body section > :where(p, ul, ol, blockquote, h3, h4, dl) { max-width: var(--measure); }
.lesson-body h2 {
  display: flex; align-items: baseline; gap: 12px;
  font: 700 clamp(20px, 2.4vw, 26px)/1.3 var(--font-mono);
  margin: 0 0 18px; padding-bottom: 10px; border-bottom: 1px solid var(--line-strong);
}
.sec-num { color: var(--mod); font-size: .72em; white-space: nowrap; }
.lesson-body h3 { font: 700 18px/1.4 var(--font-mono); margin: 30px 0 10px; scroll-margin-top: calc(var(--header-h) + 16px); color: var(--amber); }
.lesson-body h4 { font: 700 15px var(--font-mono); margin: 24px 0 8px; }
.lesson-body p { margin: 0 0 1em; }
.lesson-body li { margin: .3em 0; }
.lesson-body ul, .lesson-body ol { padding-left: 1.5em; }
.lesson-body strong { color: #ecf4f2; }
.lesson-body hr { border: 0; border-top: 1px dashed var(--line-strong); margin: 28px 0; }
.lesson-body :not(pre) > code {
  font: .86em var(--font-mono);
  background: var(--bg-3); border: 1px solid var(--line); border-radius: 4px; padding: .1em .4em;
  color: #f0d9a8; overflow-wrap: anywhere;
}
.lesson-body blockquote {
  margin: 1.2em 0; padding: 12px 18px;
  border-left: 4px solid var(--amber);
  background: color-mix(in srgb, var(--amber) 7%, var(--bg-1));
  border-radius: 0 var(--radius) var(--radius) 0;
}
.lesson-body blockquote > :last-child { margin-bottom: 0; }
.lesson-body blockquote::before { content: "NOTA"; display: block; font: 700 11px var(--font-mono); letter-spacing: .12em; color: var(--amber); margin-bottom: 4px; }

.table-wrap { overflow-x: auto; margin: 1.2em 0; border: 1px solid var(--line-strong); border-radius: var(--radius); }
.table-wrap:focus-visible { outline-offset: 0; }
.lesson-body table { border-collapse: collapse; width: 100%; font-size: 14.5px; line-height: 1.5; }
.lesson-body th, .lesson-body td { padding: 9px 12px; text-align: left; vertical-align: top; border-bottom: 1px solid var(--line); }
.lesson-body td + td, .lesson-body th + th { border-left: 1px solid var(--line); }
.lesson-body th {
  background: color-mix(in srgb, var(--mod) 20%, var(--bg-2));
  border-bottom: 2px solid var(--mod);
  font: 700 12.5px var(--font-mono); white-space: nowrap; color: #fff;
}
.lesson-body td code, .lesson-body th code { overflow-wrap: normal; }
.lesson-body tbody tr:nth-child(even) td { background: rgba(255, 255, 255, 0.025); }
.lesson-body tbody tr:last-child td { border-bottom: 0; }

/* bloques de código con cabecera "copia" */
.codeblock { margin: 1.2em 0; border: 1px solid var(--line-strong); border-radius: var(--radius); overflow: hidden; background: #070a10; }
.code-head {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 4px 6px 4px 12px; background: var(--bg-2); border-bottom: 1px solid var(--line);
  font: 12px var(--font-mono); color: var(--muted);
}
.code-head .lang::before { content: "● "; color: var(--accent); }
.copy-btn {
  min-height: 30px; padding: 2px 12px; cursor: pointer;
  font: 700 12px var(--font-mono); color: var(--text);
  background: var(--bg-3); border: 1px solid var(--line-strong); border-radius: 4px;
}
.copy-btn:hover { border-color: var(--accent); color: var(--accent); }
.copy-btn.ok { border-color: var(--accent); color: var(--accent-ink); background: var(--accent); }
.copy-btn.fail { border-color: var(--danger); color: var(--danger); }
.codeblock pre { margin: 0; padding: 14px 16px; overflow-x: auto; font: 13.5px/1.6 var(--font-mono); color: #cfe3dc; tab-size: 4; }
.codeblock pre:focus-visible { outline-offset: -2px; }

/* ---------- Pie de lección ---------- */
.lesson-foot { margin-top: 48px; padding-top: 24px; border-top: 1px solid var(--line-strong); }
.complete-row { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; margin-bottom: 24px; }
.pager { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.pager a {
  display: block; padding: 14px 16px; text-decoration: none; color: var(--text);
  border: 1px solid var(--line-strong); border-radius: var(--radius); background: var(--bg-1);
}
.pager a:hover { border-color: var(--accent); }
.pager small { display: block; font: 700 11px var(--font-mono); color: var(--accent); text-transform: uppercase; letter-spacing: .08em; margin-bottom: 4px; }
.pager a.next { text-align: right; grid-column: 2; }
.pager a.prev { grid-column: 1; }

/* ---------- Búsqueda ---------- */
.search-page, .plan-page, .simple-page { max-width: 860px; margin: 0 auto; }
.search-page h1, .plan-page h1, .simple-page h1 { font: 800 28px var(--font-mono); margin: 0 0 8px; }
.count-line { font: 13px var(--font-mono); color: var(--muted); margin: 0 0 20px; }
.results { list-style: none; margin: 0; padding: 0; display: grid; gap: 14px; }
.result a { display: block; padding: 14px 16px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--bg-1); color: var(--text); text-decoration: none; border-left: 4px solid var(--mod); }
.result a:hover { border-color: var(--mod); background: var(--bg-2); }
.result h2 { font: 700 16px/1.35 var(--font-mono); margin: 6px 0 6px; }
.result p { margin: 0; color: var(--muted); font-size: 14.5px; }
mark { background: var(--mark-bg); color: var(--mark-ink); padding: 0 2px; border-radius: 2px; font-weight: 700; }
.empty { padding: 28px; border: 1px dashed var(--line-strong); border-radius: var(--radius); color: var(--muted); }
.empty strong { color: var(--text); font-family: var(--font-mono); }

/* ---------- Plan ---------- */
.route-block { margin: 0 0 36px; }
.route-block h2 { font: 700 18px var(--font-mono); margin: 0 0 4px; }
.route-block .desc { color: var(--muted); margin: 0 0 12px; max-width: 70ch; }
.route-block .rp { display: flex; align-items: center; gap: 12px; margin-bottom: 12px; font: 13px var(--font-mono); }
.route-block .rp .bar { flex: 1; }
.steps { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; counter-reset: paso; }
.steps li a {
  counter-increment: paso;
  display: flex; align-items: center; gap: 12px; padding: 9px 12px;
  border: 1px solid var(--line); border-radius: var(--radius); background: var(--bg-1);
  color: var(--text); text-decoration: none; font-size: 15px;
}
.steps li a::before { content: counter(paso); font: 700 12px var(--font-mono); color: var(--muted); width: 18px; text-align: right; }
.steps li a:hover { border-color: var(--line-strong); background: var(--bg-2); }

.checklist { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; }
.checklist li { display: flex; align-items: center; gap: 12px; padding: 8px 12px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--bg-1); }
.checklist input[type="checkbox"] { width: 20px; height: 20px; accent-color: var(--accent); flex: none; cursor: pointer; }
.checklist label { flex: 1; cursor: pointer; }
.checklist li.done a { color: var(--muted); }
.checklist .tag { font: 11px var(--font-mono); color: var(--muted); }

.reset-zone { margin-top: 40px; padding: 18px; border: 1px solid var(--line-strong); border-radius: var(--radius); }
.reset-zone p { margin: 0 0 12px; }
.reset-zone .actions { display: flex; gap: 10px; flex-wrap: wrap; }

/* ---------- Drawer (<900px) y scrim ---------- */
.scrim { position: fixed; inset: var(--header-h) 0 0 0; background: rgba(2, 4, 8, .7); z-index: 29; }
.scrim[hidden] { display: none; }

@media (max-width: 1199.98px) {
  .lesson-layout { grid-template-columns: minmax(0, 1fr); gap: 20px; }
  .toc { position: static; max-height: none; order: -1; padding: 12px 14px; border: 1px solid var(--line-strong); border-radius: var(--radius); background: var(--bg-1); }
  .toc ol { border-left: 0; columns: 2 220px; }
  .toc a { border-left: 0; border-bottom: 2px solid transparent; }
  .toc a:is(:target-current, .\:target-current) { border-left: 0; border-bottom-color: var(--accent); }
}

@media (max-width: 899.98px) {
  :root { --header-h: 60px; }
  .icon-btn { display: inline-flex; }
  .brand small { display: none; }
  .search { flex: 1 1 auto; margin-left: 0; }
  .search kbd { display: none; }
  .sidebar {
    position: fixed; left: 0; top: var(--header-h); bottom: 0; z-index: 30;
    width: min(88vw, 340px); height: auto;
    transform: translateX(-102%); visibility: hidden;
    transition: transform .25s ease, visibility 0s linear .25s;
  }
  body.nav-open .sidebar { transform: none; visibility: visible; transition-delay: 0s; }
  .side-search { display: none; }
  .pager { grid-template-columns: 1fr; }
  .pager a.next, .pager a.prev { grid-column: 1; text-align: left; }
}
@media (max-width: 520px) {
  .brand-text { display: none; }
}

/* ---------- Movimiento reducido ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
}

/* ---------- Contraste alto / colores forzados ---------- */
@media (prefers-contrast: more) {
  :root { --line: #62748a; --muted: #b8c6d4; --faint: #aab8c6; }
}
@media (forced-colors: active) {
  body::after { display: none; }
  .bar > span { background: Highlight; }
  .chip, .swatch, .btn, .copy-btn { border-color: ButtonText; }
  .toc a:is(:target-current, .\:target-current), .mod li a[aria-current="page"] { outline: 2px solid Highlight; }
  mark { background: Mark; color: MarkText; }
}

/* ---------- Spoiler Box & Validador Interactivo V2 ---------- */
.spoiler-card {
  margin: 20px 0; background: var(--bg-1); border: 1px solid var(--line-strong);
  border-radius: var(--radius); overflow: hidden;
}
.spoiler-card[open] { border-color: var(--amber); }
.spoiler-card summary {
  padding: 10px 14px; background: var(--bg-2); font: 600 13px var(--font-mono);
  color: var(--amber); cursor: pointer; user-select: none; list-style: none;
  display: flex; align-items: center; gap: 8px;
}
.spoiler-card summary::-webkit-details-marker { display: none; }
.spoiler-card summary:hover { background: var(--bg-3); }
.spoiler-body {
  padding: 14px 16px; border-top: 1px solid var(--line); font-size: 14px;
}
.spoiler-body p { margin: 6px 0; }

.flag-validator {
  background: var(--bg-1); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 18px 20px; margin: 28px 0 16px;
}
.flag-validator h4 {
  font: 700 14px var(--font-mono); color: #fff; margin: 0 0 6px;
  display: flex; align-items: center; gap: 8px;
}
.flag-validator p {
  font-size: 13px; color: var(--muted); margin: 0 0 12px;
}
.validator-row {
  display: flex; gap: 10px; max-width: 540px;
}
.validator-row .btn { min-height: 36px; padding: 0 16px; white-space: nowrap; }
.flag-input {
  flex: 1; height: 36px; padding: 0 12px; background: var(--bg-2);
  border: 1px solid var(--line-strong); border-radius: 4px;
  color: var(--text); font: 13px var(--font-mono);
}
.flag-input:focus {
  outline: none; border-color: var(--accent); box-shadow: 0 0 10px rgba(61, 220, 132, 0.2);
}
.validator-feedback {
  margin-top: 10px; font: 600 13px var(--font-mono); min-height: 20px;
}
.validator-feedback.ok { color: var(--accent); }
.validator-feedback.err { color: var(--danger); }