/* CodeLab · Layout: barra superior fija; vistas de una columna centrada (inicio, docente)
   y espacio de trabajo en dos paneles (enunciado/asistente | editor + resultados), apilado en teléfono. */
:root {
  --bg: #F3F5F6; --panel: #FFFFFF; --sunk: #E9EDEF; --ink: #121A1F; --muted: #56636B; --line: #D5DCE0;
  --accent: #0B6E69; --accent-ink: #FFFFFF; --accent-soft: #DCEFEC;
  --hl: #E29A1C; --hl-soft: #FFF1D3; --hl-ink: #6B4400;
  --ok: #1B7A45; --ok-soft: #DEF2E5; --bad: #B3261E; --bad-soft: #FBE3E0; --warn: #8A5A00; --warn-soft: #FAEFD3;
  --k: #8A3D9E; --s: #1B7A45; --n: #B04A14; --c: #7A868E; --def: #1F5FA8; --cursor: #121A1F; --sel: #CFE7E3;
  --display: "Sora", "Atkinson Hyperlegible", system-ui, sans-serif;
  --body: "Atkinson Hyperlegible", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "JetBrains Mono", ui-monospace, Consolas, monospace;
  --top-h: 58px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --bg: #0F1417; --panel: #161D21; --sunk: #1D262B; --ink: #E5ECEF; --muted: #95A3AB; --line: #29343A;
    --accent: #3CC2B8; --accent-ink: #062321; --accent-soft: #123532;
    --hl: #F2B544; --hl-soft: #3A2C10; --hl-ink: #FFD98A;
    --ok: #5BCB8A; --ok-soft: #13291D; --bad: #F2867D; --bad-soft: #3A1916; --warn: #E7BE5C; --warn-soft: #33290F;
    --k: #D39BE3; --s: #7CD3A2; --n: #F2A57C; --c: #6F7C84; --def: #7DB3EE; --cursor: #E5ECEF; --sel: #1E4440;
  }
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0F1417; --panel: #161D21; --sunk: #1D262B; --ink: #E5ECEF; --muted: #95A3AB; --line: #29343A;
  --accent: #3CC2B8; --accent-ink: #062321; --accent-soft: #123532;
  --hl: #F2B544; --hl-soft: #3A2C10; --hl-ink: #FFD98A;
  --ok: #5BCB8A; --ok-soft: #13291D; --bad: #F2867D; --bad-soft: #3A1916; --warn: #E7BE5C; --warn-soft: #33290F;
  --k: #D39BE3; --s: #7CD3A2; --n: #F2A57C; --c: #6F7C84; --def: #7DB3EE; --cursor: #E5ECEF; --sel: #1E4440;
}
* { box-sizing: border-box }
html, body { margin: 0; min-height: 100% }
body { background: var(--bg); color: var(--ink); font: 16.5px/1.55 var(--body); padding-top: env(safe-area-inset-top, 0px) }
[hidden] { display: none !important }
h1, h2, h3 { font-family: var(--display); margin: 0; line-height: 1.15; text-wrap: balance; letter-spacing: -.01em }
p { margin: 0 }
a { color: var(--accent) }
code, pre, kbd, .mono { font-family: var(--mono); font-variant-ligatures: none }
button, input, select, textarea { font: inherit; color: inherit }
button, a, summary { -webkit-tap-highlight-color: transparent }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px }
.gut { padding-left: max(16px, env(safe-area-inset-left, 0px)); padding-right: max(16px, env(safe-area-inset-right, 0px)) }
.wrap { max-width: 1100px; margin: 0 auto }
.muted { color: var(--muted) }
.eyebrow { font: 700 12.5px/1 var(--body); letter-spacing: .1em; text-transform: uppercase; color: var(--accent) }

/* barra superior */
.top { position: sticky; top: env(safe-area-inset-top, 0px); z-index: 20; background: var(--panel); border-bottom: 1px solid var(--line) }
body::before { content: ""; position: fixed; inset: 0 0 auto; height: env(safe-area-inset-top, 0px); z-index: 21; background: var(--panel) }
.top-in { display: flex; align-items: center; gap: 10px 18px; min-height: var(--top-h) }
.brand { display: flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; font: 800 19px/1 var(--display); flex: 0 0 auto }
.logo { width: 30px; height: 30px; border-radius: 8px; background: var(--accent); color: var(--accent-ink); display: grid; place-items: center; font: 700 13px var(--mono) }
.nav { display: flex; gap: 4px; flex: 1 1 auto; min-width: 0; overflow-x: auto }
.nav a { padding: 8px 12px; border-radius: 8px; color: var(--muted); text-decoration: none; font-weight: 700; white-space: nowrap }
.nav a[aria-current="page"] { color: var(--ink); background: var(--sunk) }
.who { display: flex; align-items: center; gap: 10px; flex: 0 0 auto; font-size: 14.5px }
.who b { max-width: 16ch; overflow: hidden; text-overflow: ellipsis; white-space: nowrap }
.timer { font: 700 15px var(--mono); padding: 6px 10px; border-radius: 8px; background: var(--sunk); font-variant-numeric: tabular-nums }
.timer.warn { background: var(--bad-soft); color: var(--bad) }

/* botones y formularios */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 9px 16px; border-radius: 9px; border: 1px solid var(--line); background: var(--panel); color: var(--ink); font-weight: 700; cursor: pointer; text-decoration: none; white-space: nowrap; touch-action: manipulation }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink) }
.btn.hl { background: var(--hl); border-color: var(--hl); color: #241600 }
.btn.ghost { background: transparent; border-color: transparent; color: var(--muted) }
.btn.danger { color: var(--bad); border-color: var(--bad-soft) }
.btn.sm { padding: 6px 11px; font-size: 14.5px }
.btn[disabled] { opacity: .55; cursor: default }
@media (hover: hover) { .btn:hover:not([disabled]) { border-color: var(--muted) } .btn.primary:hover:not([disabled]) { filter: brightness(1.07) } }
.field { display: grid; gap: 5px }
.field label { font-weight: 700; font-size: 14.5px }
.field small { color: var(--muted); font-size: 13.5px }
.input { width: 100%; padding: 10px 12px; border: 1px solid var(--line); border-radius: 9px; background: var(--panel); font-size: 16px }
.input:focus { border-color: var(--accent) }
textarea.input { font-family: var(--mono); font-size: 14.5px; min-height: 80px; resize: vertical }
.err-msg { color: var(--bad); font-weight: 700; font-size: 15px }
.ok-msg { color: var(--ok); font-weight: 700; font-size: 15px }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: 14px; padding: 20px }
.pill { display: inline-flex; align-items: center; gap: 5px; font: 700 12.5px/1 var(--body); padding: 5px 9px; border-radius: 99px; white-space: nowrap; letter-spacing: .02em }
.p-ok { background: var(--ok-soft); color: var(--ok) } .p-bad { background: var(--bad-soft); color: var(--bad) }
.p-warn { background: var(--warn-soft); color: var(--warn) } .p-acc { background: var(--accent-soft); color: var(--accent) }
.p-mute { background: var(--sunk); color: var(--muted) } .p-hl { background: var(--hl-soft); color: var(--hl-ink) }
.row { display: flex; gap: 10px 14px; align-items: center; flex-wrap: wrap }
.grow { flex: 1 1 auto }
.stack { display: grid; gap: 14px }
.toast { position: fixed; left: 50%; bottom: calc(18px + env(safe-area-inset-bottom, 0px)); transform: translateX(-50%); background: var(--ink); color: var(--panel); padding: 10px 16px; border-radius: 10px; font-weight: 700; z-index: 50; max-width: calc(100% - 32px) }

/* bienvenida */
.landing { padding-block: 40px 64px }
.hero { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr); gap: 40px; align-items: center }
.hero h1 { font-size: clamp(34px, 5.4vw, 56px); font-weight: 800; letter-spacing: -.03em }
.hero h1 em { font-style: normal; color: var(--accent) }
.hero .lead { font-size: 19px; color: var(--muted); margin-top: 16px; max-width: 46ch }
.hero .cta { margin-top: 24px }
.mock { background: var(--panel); border: 1px solid var(--line); border-radius: 16px; overflow: hidden; box-shadow: 0 18px 40px rgba(10, 30, 35, .08) }
.mock-bar { display: flex; gap: 8px; align-items: center; padding: 10px 14px; border-bottom: 1px solid var(--line); font: 600 13px var(--mono); color: var(--muted) }
.mock-code { padding: 12px 0; font: 14px/1.7 var(--mono); overflow-x: auto }
.mock-code div { display: grid; grid-template-columns: 2.6em minmax(0, 1fr); white-space: pre; padding-right: 14px }
.mock-code div span:first-child { color: var(--c); text-align: right; padding-right: 12px }
.mock-code .here { background: var(--hl-soft); box-shadow: inset 3px 0 0 var(--hl) }
.mock-tip { margin: 0 14px 14px; padding: 12px 14px; border-radius: 12px; background: var(--hl-soft); color: var(--ink); font-size: 15px; border: 1px solid var(--hl) }
.mock-tip b { color: var(--hl-ink) }
.feats { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; margin-top: 48px }
.feat h3 { font-size: 18px; margin-bottom: 6px }
.feat p { color: var(--muted); font-size: 15.5px }
.auth { max-width: 440px; margin: 40px auto 64px }
.auth h1 { font-size: 30px; margin-bottom: 6px }
.auth form { display: grid; gap: 14px; margin-top: 18px }
.tok-k { color: var(--k) } .tok-s { color: var(--s) } .tok-n { color: var(--n) } .tok-c { color: var(--c); font-style: italic } .tok-d { color: var(--def) }

/* páginas */
.page { padding-block: 28px 64px; display: grid; gap: 28px }
.page-h { display: grid; gap: 6px }
.page-h h1 { font-size: clamp(26px, 4vw, 36px); font-weight: 800 }
.sec-h { display: flex; align-items: baseline; gap: 12px; flex-wrap: wrap }
.sec-h h2 { font-size: 21px }
.grid-cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 320px), 1fr)); gap: 14px }
.asig { display: grid; gap: 12px; align-content: start }
.asig h3 { font-size: 19px }
.meter { height: 8px; border-radius: 99px; background: var(--sunk); overflow: hidden }
.meter i { display: block; height: 100%; background: var(--accent) }
.ej-list { display: grid; gap: 6px; margin: 0; padding: 0; list-style: none }
.ej-list a { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 10px; align-items: center; padding: 9px 12px; border-radius: 10px; background: var(--bg); color: var(--ink); text-decoration: none; font-weight: 700 }
.ej-list a small { display: block; font-weight: 400; color: var(--muted); font-size: 13.5px }
.bloque { display: grid; gap: 10px }
.bloque h3 { font-size: 17px; color: var(--muted); font-family: var(--body); letter-spacing: .04em; text-transform: uppercase }
.tile { display: grid; gap: 6px; text-decoration: none; color: var(--ink); background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 14px 16px }
@media (hover: hover) { .tile:hover { border-color: var(--accent) } }
.tile b { font-family: var(--display); font-size: 16.5px }
.tile .row { gap: 6px }
.empty { color: var(--muted); padding: 18px; border: 1px dashed var(--line); border-radius: 12px }
.tbl-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: 12px; background: var(--panel) }
table.tbl { border-collapse: collapse; width: 100%; font-size: 15px }
.tbl th, .tbl td { text-align: left; padding: 9px 12px; border-bottom: 1px solid var(--line); vertical-align: middle; white-space: nowrap }
.tbl th { font-size: 12.5px; letter-spacing: .05em; text-transform: uppercase; color: var(--muted); background: var(--bg) }
.tbl td.num, .tbl th.num { text-align: right; font-variant-numeric: tabular-nums }
.tbl tr:last-child td { border-bottom: 0 }
.tbl .cell-ok { color: var(--ok); font-weight: 700 } .tbl .cell-bad { color: var(--bad); font-weight: 700 }
.codigo-grupo { font: 700 26px var(--mono); letter-spacing: .14em; background: var(--accent-soft); color: var(--accent); padding: 6px 14px; border-radius: 10px }
.picker { display: grid; gap: 14px; max-height: 420px; overflow: auto; padding: 4px }
.picker label { display: flex; gap: 10px; align-items: flex-start; padding: 8px 10px; border-radius: 9px; background: var(--bg); cursor: pointer }
.picker input { margin-top: 4px; width: 18px; height: 18px; accent-color: var(--accent) }
.form-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 230px), 1fr)); gap: 14px }
.seg { display: inline-flex; border: 1px solid var(--line); border-radius: 10px; overflow: hidden }
.seg label { position: relative; padding: 8px 14px; cursor: pointer; font-weight: 700 }
.seg input { position: absolute; opacity: 0; pointer-events: none }
.seg input:checked + span { color: var(--accent) }
.seg label:has(input:checked) { background: var(--accent-soft) }
.drawer { position: fixed; inset: 0; z-index: 40; background: rgba(8, 15, 18, .45); display: flex; justify-content: flex-end }
.drawer-in { width: min(860px, 100%); height: 100%; overflow: auto; background: var(--bg); padding-block: 20px 60px; display: grid; gap: 16px; align-content: start; padding-bottom: calc(60px + env(safe-area-inset-bottom, 0px)) }
.code-view { margin: 0; background: var(--panel); border: 1px solid var(--line); border-radius: 10px; padding: 12px 14px; font: 13.5px/1.6 var(--mono); overflow-x: auto; white-space: pre }
.timeline { list-style: none; margin: 0; padding: 0; display: grid; gap: 4px; font-size: 14.5px }
.timeline li { display: grid; grid-template-columns: 6.5em minmax(0, 1fr); gap: 10px }

/* reproductor de ejercicios */
body.en-ej { overflow: hidden }
.ws { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); height: calc(100dvh - var(--top-h) - 1px - env(safe-area-inset-top, 0px)) }
.pane { min-width: 0; min-height: 0; overflow: auto }
.izq { background: var(--panel); border-right: 1px solid var(--line); display: flex; flex-direction: column }
.izq > * { flex-shrink: 0 }
.der { display: flex; flex-direction: column; overflow: hidden }
.der > * { flex-shrink: 0 }
.tabs { display: flex; gap: 2px; border-bottom: 1px solid var(--line); position: sticky; top: 0; background: var(--panel); z-index: 2; overflow-x: auto }
.tab { background: none; border: 0; border-bottom: 2px solid transparent; padding: 12px 12px 10px; font-weight: 700; color: var(--muted); cursor: pointer; white-space: nowrap; display: inline-flex; gap: 6px; align-items: center }
.tab[aria-selected="true"] { color: var(--ink); border-bottom-color: var(--accent) }
.tab .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--hl) }
.stmt { padding-block: 18px 40px; display: grid; gap: 14px }
.stmt h1 { font-size: 25px; font-weight: 800 }
.stmt code { background: var(--sunk); padding: 1px 5px; border-radius: 5px; font-size: 14px }
.stmt ul, .stmt ol { margin: 0; padding-left: 22px; display: grid; gap: 4px }
.term { margin: 0; background: #11181C; color: #DCE4E8; border-radius: 10px; padding: 12px 14px; font: 13.5px/1.55 var(--mono); white-space: pre-wrap; overflow-wrap: anywhere; max-height: 300px; overflow: auto }
.term .in { color: #F2B544; font-weight: 700 }
.term .er { color: #F2867D }
.box { border: 1px solid var(--line); border-radius: 12px; padding: 14px 16px; display: grid; gap: 8px; background: var(--bg) }
.box h3 { font: 700 12.5px var(--body); letter-spacing: .08em; text-transform: uppercase; color: var(--muted) }
/* asistente */
.asis { padding-block: 16px 40px; display: grid; gap: 14px }
.pasos { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px }
.paso { display: grid; grid-template-columns: 30px minmax(0, 1fr) auto; gap: 10px; align-items: center; padding: 8px 10px; border-radius: 10px; cursor: pointer; border: 1px solid transparent }
.paso .n { width: 26px; height: 26px; border-radius: 50%; display: grid; place-items: center; font: 700 13px var(--mono); background: var(--sunk); color: var(--muted) }
.paso.hecho .n { background: var(--ok); color: #fff }
.paso.actual { border-color: var(--hl); background: var(--hl-soft) }
.paso.actual .n { background: var(--hl); color: #241600 }
.paso b { font-weight: 700 }
.paso-card { border: 2px solid var(--hl); border-radius: 14px; padding: 16px; display: grid; gap: 12px; background: var(--panel) }
.paso-card h3 { font-size: 19px }
.paso-card .explica code { background: var(--sunk); padding: 1px 5px; border-radius: 5px; font-size: 14px }
.snippet { margin: 0; background: var(--hl-soft); border: 1px dashed var(--hl); border-radius: 10px; padding: 10px 12px; font: 14px/1.6 var(--mono); white-space: pre; overflow-x: auto }
.CodeMirror .cl-ancla { background: var(--hl-soft) }
.CodeMirror .cl-aqui { background: var(--hl-soft); box-shadow: inset 4px 0 0 var(--hl) }
.CodeMirror .cl-escrito { background: var(--accent-soft) }
.CodeMirror .cl-pulso { animation: pulso 1.2s ease-in-out 2 }
@keyframes pulso { 50% { background: var(--hl) } }
.editor { flex: 1 1 0; min-height: 140px; display: flex; flex-direction: column; background: var(--panel); position: relative }
.editor .CodeMirror { flex: 1 1 auto; height: 100%; font: 15px/1.6 var(--mono); background: var(--panel); color: var(--ink) }
.CodeMirror { font-variant-ligatures: none }
.CodeMirror pre.CodeMirror-line, .CodeMirror pre.CodeMirror-line-like { font-variant-ligatures: none }
.CodeMirror-gutters { background: var(--panel); border-right: 1px solid var(--line) }
.CodeMirror-linenumber { color: var(--c) }
.CodeMirror-cursor { border-left: 2px solid var(--cursor) }
.CodeMirror-selected, .CodeMirror-focused .CodeMirror-selected { background: var(--sel) }
.CodeMirror-activeline-background { background: color-mix(in srgb, var(--sunk) 60%, transparent) }
.CodeMirror-matchingbracket { color: var(--accent) !important; text-decoration: underline }
.cm-s-default .cm-keyword { color: var(--k) } .cm-s-default .cm-string { color: var(--s) } .cm-s-default .cm-number { color: var(--n) }
.cm-s-default .cm-comment { color: var(--c); font-style: italic } .cm-s-default .cm-def, .cm-s-default .cm-builtin { color: var(--def) }
.cm-s-default .cm-variable, .cm-s-default .cm-variable-2, .cm-s-default .cm-property { color: var(--ink) } .cm-s-default .cm-operator { color: var(--muted) }
.ed-bar { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; padding-block: 8px; border-bottom: 1px solid var(--line); background: var(--panel) }
.ed-bar .file { font: 600 13.5px var(--mono); color: var(--muted); margin-right: auto }
.status { display: flex; gap: 8px; align-items: center; font-size: 14px; color: var(--muted) }
.status i { width: 8px; height: 8px; border-radius: 50%; background: var(--muted) }
.status i.ok { background: var(--ok) } .status i.busy { background: var(--hl); animation: parp 1s infinite } .status i.bad { background: var(--bad) }
@keyframes parp { 50% { opacity: .35 } }
.runbar { order: 9; display: flex; gap: 8px; align-items: center; flex-wrap: wrap; padding-block: 10px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); background: var(--panel) }
.runbar .info { margin-right: auto; font-size: 14px; color: var(--muted) }
.res { flex: 0 1 auto; min-height: 0; max-height: 42%; overflow: auto; background: var(--bg); border-top: 1px solid var(--line) }
.res-in { padding-block: 14px 28px; display: grid; gap: 10px }
.sum { display: flex; align-items: center; gap: 10px 14px; flex-wrap: wrap }
.sum .big { font: 800 22px var(--display); font-variant-numeric: tabular-nums }
details.caso { background: var(--panel); border: 1px solid var(--line); border-radius: 10px }
details.caso > summary { list-style: none; cursor: pointer; display: grid; grid-template-columns: auto minmax(0, 1fr) auto; gap: 10px; align-items: center; padding: 10px 12px }
details.caso > summary::-webkit-details-marker { display: none }
.caso-n { font-weight: 700; overflow: hidden; text-overflow: ellipsis; white-space: nowrap }
.caso-b { padding: 0 12px 12px; display: grid; gap: 8px }
.why { margin: 0; padding-left: 20px; color: var(--bad); font-weight: 700; font-size: 15px }
.ayuda-err { background: var(--warn-soft); border-radius: 10px; padding: 10px 12px; font-size: 15px }
.ayuda-err b { color: var(--warn) }
.keys, .mtabs { display: none }
/* gamificación */
.xp-chip { display: inline-flex; align-items: center; gap: 6px; padding: 5px 10px; border-radius: 99px; background: var(--accent-soft); color: var(--ink); text-decoration: none; font-size: 14px; white-space: nowrap }
.xp-chip .lv { font: 700 12px var(--body); background: var(--accent); color: var(--accent-ink); padding: 2px 7px; border-radius: 99px }
.xp-chip b { font-variant-numeric: tabular-nums }
.racha { display: inline-flex; align-items: center; gap: 2px; color: var(--hl-ink); font-weight: 700 }
.ico { width: 26px; height: 26px; flex: 0 0 auto }
.ico.sm { width: 16px; height: 16px }
.progreso { display: grid; gap: 16px }
.nivel-box { display: flex; gap: 16px; align-items: center }
.nivel-n { width: 66px; height: 66px; border-radius: 18px; background: var(--accent); color: var(--accent-ink); display: grid; place-items: center; align-content: center; flex: 0 0 auto }
.nivel-n span { font: 700 11px var(--body); letter-spacing: .08em; text-transform: uppercase; opacity: .85 }
.nivel-n b { font: 800 28px/1 var(--display) }
.meter.xp { height: 12px } .meter.xp i { background: linear-gradient(90deg, var(--accent), var(--hl)) }
.prog-row { display: flex; gap: 12px 22px; align-items: center; flex-wrap: wrap }
.mini-stat { display: flex; gap: 10px; align-items: center; color: var(--hl-ink) }
.mini-stat div { display: grid; color: var(--ink) } .mini-stat .muted { font-size: 14px }
.reglas { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 230px), 1fr)); gap: 12px }
.reglas > div { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 14px; display: grid; gap: 4px }
.reglas span { color: var(--muted); font-size: 14.5px }
.insignias { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 250px), 1fr)); gap: 10px }
.ins { display: flex; gap: 12px; align-items: flex-start; background: var(--panel); border: 1px dashed var(--line); border-radius: 12px; padding: 12px 14px; color: var(--muted) }
.ins .ico { width: 34px; height: 34px; padding: 6px; border-radius: 10px; background: var(--sunk) }
.ins.on { border-style: solid; border-color: var(--hl); color: var(--ink) }
.ins.on .ico { background: var(--hl-soft); color: var(--hl-ink) }
.ins b { color: var(--ink) }
.stars { display: inline-flex; gap: 2px }
.stars svg { width: 17px; height: 17px; fill: var(--sunk); stroke: var(--line); stroke-width: 1.2 }
.stars svg.on { fill: var(--hl); stroke: var(--hl) }
.mapa { display: grid; gap: 14px }
.mundo { background: var(--panel); border: 1px solid var(--line); border-radius: 14px; padding: 14px 16px; display: grid; gap: 12px }
.mundo-h { display: flex; gap: 10px; align-items: center }
.mundo-n { width: 30px; height: 30px; border-radius: 50%; background: var(--accent); color: var(--accent-ink); display: grid; place-items: center; font: 800 15px var(--display) }
.camino { display: flex; gap: 8px; flex-wrap: wrap }
.nodo { display: grid; gap: 4px; padding: 10px 12px; border-radius: 12px; border: 2px solid var(--line); background: var(--bg); color: var(--ink); text-decoration: none; min-width: 150px; flex: 1 1 150px }
.nodo.e2, .nodo.e3 { border-color: var(--hl) }
.nodo.e1 { border-style: dashed; border-color: var(--hl) }
.nodo-t { font-weight: 700; font-size: 15px }
.tbl tr.yo td { background: var(--accent-soft) }
.celebra { justify-content: center; align-items: center }
.cele { position: relative; width: min(440px, calc(100% - 32px)); display: grid; gap: 12px; text-align: left; overflow: hidden }
.cele h2 { font-size: 26px }
.tour { gap: 14px }
.tour-txt { display: grid; gap: 10px; font-size: 16.5px }
.tour-txt ul { margin: 0; padding-left: 20px; display: grid; gap: 6px }
.tour-dots { display: flex; gap: 6px; justify-content: center }
.tour-dots i { width: 8px; height: 8px; border-radius: 50%; background: var(--line) }
.tour-dots i.on { background: var(--accent); width: 22px; border-radius: 99px }
.confeti { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none }
/* «¿por qué?» */
.porque-code { border: 1px solid var(--line); border-radius: 10px; background: var(--panel); overflow: hidden }
.pl { display: grid; grid-template-columns: 2.4em minmax(0, 1fr) 1.6em; width: 100%; text-align: left; border: 0; border-bottom: 1px solid var(--sunk); background: none; padding: 5px 8px 5px 0; cursor: pointer; font: 14px/1.5 var(--mono); color: var(--ink) }
.pl[disabled] { cursor: default }
.pl-n { color: var(--c); text-align: right; padding-right: 10px }
.pl-c { white-space: pre; overflow-x: auto }
.pl-q { color: var(--accent); font: 700 13px var(--body); text-align: center; border-radius: 50%; }
@media (hover: hover) { .pl:not([disabled]):hover { background: var(--sunk) } }
.pl.on { background: var(--hl-soft) }
.pl-exp { padding: 10px 14px; background: var(--hl-soft); border-bottom: 1px solid var(--hl) }
.exp-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; font-size: 15px }
.exp-list li { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 10px; align-items: baseline }
.exp-p { font: 700 13px var(--mono); background: var(--panel); border: 1px solid var(--line); padding: 2px 7px; border-radius: 6px; white-space: pre; max-width: 14ch; overflow: hidden; text-overflow: ellipsis }
.exp-list code { background: var(--sunk); padding: 1px 5px; border-radius: 5px; font-size: 13.5px }
.porque-panel { border-color: var(--accent) }
.porque-panel .exp-list { max-height: none }
.links { margin: 0; padding-left: 20px; display: grid; gap: 8px }
.errores { margin: 0; padding-left: 20px; display: grid; gap: 6px }
.guia-txt .tbl { margin: 4px 0 } .guia-txt code { background: var(--sunk); padding: 1px 5px; border-radius: 5px; font-size: 14px }
.guia-txt ul, .guia-txt ol { margin: 0; padding-left: 22px; display: grid; gap: 6px }
.pregunta > summary { cursor: pointer; font-weight: 700; font-size: 16px }
.pregunta[open] > summary { margin-bottom: 6px }
.tema-n { font: 800 14px var(--mono); color: var(--accent); background: var(--accent-soft); padding: 3px 8px; border-radius: 8px }
/* demostración */
.demo-cta { display: flex; gap: 12px 16px; align-items: center; flex-wrap: wrap; justify-content: space-between; border: 1px solid var(--accent); background: var(--accent-soft); border-radius: 14px; padding: 14px 16px }
.demo-cursor { position: fixed; left: 0; top: 0; z-index: 60; width: 30px; height: 30px; pointer-events: none; transition-property: transform; transition-timing-function: cubic-bezier(.3, .7, .2, 1); filter: drop-shadow(0 3px 4px rgba(0, 0, 0, .35)) }
.demo-cursor svg { width: 100%; height: 100%; fill: #fff; stroke: #121A1F; stroke-width: 1.6; stroke-linejoin: round }
.demo-cursor::after { content: ""; position: absolute; left: -12px; top: -12px; width: 26px; height: 26px; border-radius: 50%; border: 3px solid var(--hl); opacity: 0 }
.demo-cursor.clic::after { animation: clic .45s ease-out }
@keyframes clic { from { opacity: 1; transform: scale(.3) } to { opacity: 0; transform: scale(1.6) } }
.demo-panel { position: fixed; z-index: 55; right: max(16px, env(safe-area-inset-right, 0px)); bottom: calc(86px + env(safe-area-inset-bottom, 0px)); width: min(440px, calc(100% - 32px)); background: var(--panel); border: 2px solid var(--hl); border-radius: 16px; padding: 16px 18px; display: grid; gap: 8px; box-shadow: 0 16px 40px rgba(8, 20, 24, .22); max-height: calc(100dvh - 110px - env(safe-area-inset-bottom, 0px)); overflow: auto }
.demo-panel h3 { font-size: 19px }
.demo-panel .dn-txt { font-size: 15.5px; max-height: 30vh; overflow: auto }
.demo-panel .dn-txt code { background: var(--sunk); padding: 1px 5px; border-radius: 5px; font-size: 14px }
.demo-panel .dn-ctl { margin-top: 4px }
.en-demo .editor { box-shadow: inset 0 0 0 3px var(--hl) }
.ex-nav { display: flex; gap: 6px; flex-wrap: wrap }
.examen-start { max-width: 640px; margin: 40px auto; display: grid; gap: 18px }
.examen-start ul { margin: 0; padding-left: 22px; display: grid; gap: 6px }

@media (max-width: 900px) {
  .hero { grid-template-columns: minmax(0, 1fr) }
  .feats { grid-template-columns: minmax(0, 1fr) }
  body.en-ej { overflow: auto; padding-bottom: calc(70px + env(safe-area-inset-bottom, 0px)) }
  .ws { display: block; height: auto }
  .pane { overflow: visible }
  .izq { border-right: 0 }
  .tabs { position: static }
  .mtabs { display: flex; position: sticky; top: calc(env(safe-area-inset-top, 0px) + var(--top-h)); z-index: 15; background: var(--panel); border-bottom: 1px solid var(--line) }
  .mtab { flex: 1 1 0; background: none; border: 0; border-bottom: 2px solid transparent; padding: 12px 4px 10px; font-weight: 700; color: var(--muted); cursor: pointer }
  .mtab[aria-selected="true"] { color: var(--ink); border-bottom-color: var(--accent) }
  .ws[data-m="enun"] .der > :not(.runbar) { display: none }
  .ws[data-m="code"] .izq, .ws[data-m="res"] .izq { display: none }
  .ws[data-m="code"] .res { display: none }
  .ws[data-m="res"] .editor, .ws[data-m="res"] .ed-bar, .ws[data-m="res"] .keys { display: none }
  .res { max-height: none; min-height: 60dvh }
  .runbar { position: fixed; left: 0; right: 0; bottom: 0; z-index: 15; border-bottom: 0; padding-bottom: calc(10px + env(safe-area-inset-bottom, 0px)); box-shadow: 0 -4px 16px rgba(0, 0, 0, .08) }
  .runbar .info { display: none }
  .runbar .btn { flex: 1 1 0; padding: 12px 8px }
  .editor { flex: 0 0 auto }
  .editor .CodeMirror { height: max(300px, calc(100dvh - var(--top-h) - 300px)); font-size: 15px }
  .CodeMirror textarea { font-size: 16px !important }
  .keys { display: flex; gap: 6px; overflow-x: auto; padding-block: 8px; border-top: 1px solid var(--line); background: var(--bg) }
  .key { flex: 0 0 auto; min-width: 42px; height: 42px; padding: 0 10px; border: 1px solid var(--line); border-radius: 8px; background: var(--panel); font: 700 16px var(--mono); cursor: pointer; touch-action: manipulation }
  .who .nombre { display: none }
  .top-in { flex-wrap: wrap; row-gap: 0 }
  .who { margin-left: auto }
  .nav { order: 3; flex-basis: 100%; padding-bottom: 6px }
  body.en-ej .nav { display: none }
  .demo-panel { left: max(16px, env(safe-area-inset-left, 0px)); right: max(16px, env(safe-area-inset-right, 0px)); width: auto; bottom: calc(78px + env(safe-area-inset-bottom, 0px)); padding: 12px 14px }
  .demo-panel .dn-txt { max-height: 18vh; font-size: 15px }
  .porque-panel { max-height: 52dvh }
  .xp-chip .muted, .xp-chip .lv { display: none }
  .nivel-n { width: 54px; height: 54px }
  .nav a { padding: 8px 9px }
}
@media (prefers-reduced-motion: reduce) { * { animation: none !important; transition: none !important } }