/* PHP Quest · juanl_oficial_
   Página blanca, tinta negra como el logo y un solo acento: el violeta de PHP.
   Títulos en Archivo estrecha y mayúsculas (a juego con el logo); JetBrains Mono solo para código. */
@font-face{font-family:"Archivo";font-style:normal;font-weight:100 900;font-stretch:62% 125%;font-display:swap;
  src:url(fonts/archivo-latin-wdth-normal.woff2) format("woff2-variations"),url(fonts/archivo-latin-wdth-normal.woff2) format("woff2");
  unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:"Archivo";font-style:normal;font-weight:100 900;font-stretch:62% 125%;font-display:swap;
  src:url(fonts/archivo-latin-ext-wdth-normal.woff2) format("woff2-variations");
  unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}
@font-face{font-family:"JetBrains Mono";font-style:normal;font-weight:100 800;font-display:swap;src:url(fonts/jetbrains-mono-latin-wght-normal.woff2) format("woff2-variations")}

:root{
  --bg:#FFFFFF; --surface:#FFFFFF; --surface-2:#F6F6F7; --ink:#000000; --ink-2:#2B2B2E; --muted:#66666E; --line:#DEDEE2; --line-2:#EDEDF0;
  --road:#000000; --road-ink:#FFFFFF; --paint:#5B5FC7; --paint-2:#4A4EB5; --paint-ink:#FFFFFF; --paint-soft:#EFEFFB;
  --accent:#5B5FC7; --accent-soft:#EFEFFB;
  --brand:#000; --brand-2:#000; --brand-ink:#fff; --brand-soft:#F1F1F3;
  --sign:#5B5FC7; --sign-ink:#fff;
  --ok:#12833B; --ok-soft:#E3F4E8; --bad:#D1242F; --bad-soft:#FDE7E8; --sel:#5B5FC7; --sel-soft:#EFEFFB; --warn:#7A5300; --warn-soft:#FFF3D6;
  --code-bg:#151518; --code-fg:#ECECEF; --code-line:#2C2C33; --code-gutter:#101012;
  --tk-var:#A9B3FF; --tk-str:#F5D78A; --tk-kw:#FF9FC9; --tk-num:#8DE2B2; --tk-com:#8B8B97;
  --f-display:"Archivo", "Arial Narrow", "Segoe UI", system-ui, sans-serif;
  --f-body:"Archivo", "Segoe UI", system-ui, -apple-system, sans-serif;
  --f-code:"JetBrains Mono", "Cascadia Mono", Consolas, ui-monospace, monospace;
  --logo-filter:none;
  color-scheme:light;
}
@media (prefers-color-scheme: dark){ :root:not([data-theme="light"]){
  --bg:#0E0E10; --surface:#16161A; --surface-2:#1B1B20; --ink:#F4F4F5; --ink-2:#D9D9DE; --muted:#9C9CA6; --line:#2E2E35; --line-2:#24242A;
  --road:#F4F4F5; --road-ink:#0E0E10; --paint:#8B8FF0; --paint-2:#9EA2F5; --paint-ink:#0E0E10; --paint-soft:#22233D; --accent:#8B8FF0; --accent-soft:#22233D;
  --brand:#F4F4F5; --brand-ink:#0E0E10; --brand-soft:#24242A; --sel:#8B8FF0; --sel-soft:#22233D;
  --ok:#45C979; --ok-soft:#14301F; --bad:#FF6B73; --bad-soft:#3A1A1D; --warn:#F2C661; --warn-soft:#352A12;
  --code-bg:#0A0A0C; --code-gutter:#060607; --code-line:#26262C; --apto-ink:#0E0E10; --logo-filter:invert(1); color-scheme:dark;
}}
:root[data-theme="dark"]{
  --bg:#0E0E10; --surface:#16161A; --surface-2:#1B1B20; --ink:#F4F4F5; --ink-2:#D9D9DE; --muted:#9C9CA6; --line:#2E2E35; --line-2:#24242A;
  --road:#F4F4F5; --road-ink:#0E0E10; --paint:#8B8FF0; --paint-2:#9EA2F5; --paint-ink:#0E0E10; --paint-soft:#22233D; --accent:#8B8FF0; --accent-soft:#22233D;
  --brand:#F4F4F5; --brand-ink:#0E0E10; --brand-soft:#24242A; --sel:#8B8FF0; --sel-soft:#22233D;
  --ok:#45C979; --ok-soft:#14301F; --bad:#FF6B73; --bad-soft:#3A1A1D; --warn:#F2C661; --warn-soft:#352A12;
  --code-bg:#0A0A0C; --code-gutter:#060607; --code-line:#26262C; --apto-ink:#0E0E10; --logo-filter:invert(1); color-scheme:dark;
}
*{box-sizing:border-box}
html,body{margin:0}
body{background:var(--bg);color:var(--ink);font-family:var(--f-body);font-size:16px;line-height:1.55;min-height:100vh;-webkit-font-smoothing:antialiased}
h1,h2,h3{font-family:var(--f-display);font-stretch:78%;font-weight:800;text-wrap:balance;margin:0;line-height:1.02;letter-spacing:-.005em}
button{font:inherit;cursor:pointer;color:inherit}
a{color:inherit;text-decoration-color:var(--accent);text-decoration-thickness:2px;text-underline-offset:3px}
:focus-visible{outline:3px solid var(--paint);outline-offset:2px}
code{font-family:var(--f-code);font-size:.88em;background:var(--brand-soft);padding:1px 5px;border-radius:4px;word-break:break-word}
.wrap{max-width:1120px;margin:0 auto;padding-inline:24px;padding-block:32px 80px}

/* Marca de agua (muy discreta) */
.watermark{position:fixed;inset:0;pointer-events:none;z-index:50;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='380' height='260'%3E%3Ctext x='24' y='140' transform='rotate(-18 190 130)' font-family='Arial Narrow,Arial,sans-serif' font-size='20' font-weight='900' letter-spacing='2' fill='%23888'%3EJUANL_OFICIAL_%3C/text%3E%3C/svg%3E");opacity:.03}
.credit{display:none}

/* Cabecera blanca */
.topbar{position:sticky;top:0;z-index:40;background:color-mix(in srgb,var(--bg) 92%,transparent);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);color:var(--ink);padding-top:env(safe-area-inset-top,0px);border-bottom:1px solid var(--line)}
.topbar .in{max-width:1120px;margin:0 auto;padding:0 24px;display:flex;align-items:center;gap:26px;min-height:64px}
.brand{display:flex;align-items:center;gap:12px;text-decoration:none;color:inherit;flex:none}
.brand img{height:22px;width:auto;display:block;filter:var(--logo-filter)}
.bname{font-family:var(--f-display);font-stretch:75%;font-weight:800;font-size:15px;letter-spacing:.04em;text-transform:uppercase;color:var(--muted);padding-left:12px;border-left:1px solid var(--line);line-height:1}
.nav{display:flex;gap:2px;flex:1;min-width:0;overflow-x:auto;scrollbar-width:none}
.nav::-webkit-scrollbar{display:none}
.nav a{text-decoration:none;color:var(--muted);font-weight:600;font-size:15px;padding:8px 11px;border-radius:7px;white-space:nowrap}
.nav a:hover{color:var(--ink);background:var(--surface-2)}
.nav a.on{color:var(--ink);background:var(--brand-soft)}
.xp{font-size:14px;font-weight:700;color:var(--accent);flex:none;white-space:nowrap;font-variant-numeric:tabular-nums}
.themeBtn{background:transparent;border:1px solid var(--line);border-radius:8px;width:36px;height:34px;display:grid;place-items:center;color:var(--ink);flex:none;padding:0}
.themeBtn:hover{border-color:var(--ink)}
.themeBtn svg{width:18px;height:18px}

/* Cuenta en la cabecera */
.who{display:inline-flex;align-items:center;gap:7px;background:transparent;border:1px solid var(--line);border-radius:999px;padding:5px 11px 5px 9px;font-size:14px;font-weight:700;color:var(--ink);flex:none;max-width:160px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.who:hover{border-color:var(--ink)}
.who[hidden]{display:none}
.who i{width:8px;height:8px;border-radius:50%;background:var(--ok);flex:none;transition:background .2s}
.who.pending i,.who.saving i{background:#E0A800}
.who.off i,.who.err i{background:var(--bad)}
body.locked .nav,body.locked .xp,body.locked .who{visibility:hidden}

/* Iniciar sesión */
.auth{display:grid;grid-template-columns:minmax(0,1.2fr) minmax(320px,420px);gap:56px;align-items:center;min-height:calc(100vh - 180px);padding-top:12px}
.auth-side{position:relative}
.auth-side .mark{font-size:clamp(76px,12vw,170px);font-stretch:68%;font-weight:900;text-transform:uppercase;line-height:.82;margin:0}
.auth-side .stamp-logo{display:block;width:min(88%,460px);margin:22px 0 0 4px;transform:rotate(-4deg);filter:var(--logo-filter)}
.auth-side .intro{margin:28px 0 0;font-size:19px;max-width:42ch;color:var(--ink-2)}
.auth-form{display:grid;gap:14px;border:1.5px solid var(--ink);border-radius:18px;padding:26px}
.seg{display:grid;grid-template-columns:1fr 1fr;background:var(--surface-2);border-radius:10px;padding:4px;margin-bottom:6px}
.seg button{border:none;background:transparent;border-radius:7px;padding:9px 8px;font-weight:700;color:var(--muted);font-size:15px}
.seg button.on{background:var(--bg);color:var(--ink);box-shadow:0 1px 3px rgba(0,0,0,.12)}
.field{display:grid;gap:6px;font-size:14px;font-weight:700}
.field input{font:inherit;font-size:16px;font-weight:500;color:var(--ink);background:var(--bg);border:1.5px solid var(--line);border-radius:10px;padding:11px 13px;width:100%}
.field input:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}
.formerr{margin:0;color:var(--bad);font-size:14.5px;font-weight:600;min-height:0}
.formerr:empty{display:none}
.auth-form .btn{width:100%}
.auth-form .tip{margin:0}
.account{display:flex;gap:16px 24px;align-items:center;justify-content:space-between;flex-wrap:wrap}
.account > div{flex:1;min-width:240px}

/* Básicos */
.card{background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:20px;min-width:0}
.btn{background:var(--ink);color:var(--bg);border:none;border-radius:8px;padding:11px 18px;font-weight:700;font-size:15px;text-decoration:none;display:inline-flex;align-items:center;justify-content:center;gap:8px;line-height:1.2}
.btn:hover{background:var(--ink-2)}
.btn.ghost{background:transparent;color:var(--ink);box-shadow:inset 0 0 0 1.5px var(--line)}
.btn.ghost:hover{box-shadow:inset 0 0 0 1.5px var(--ink);background:transparent}
.btn.sign{background:var(--accent);color:var(--paint-ink)}
.btn.ok{background:var(--ok);color:#fff}
.btn.small{padding:7px 12px;font-size:14px}
.btn.big{padding:14px 22px;font-size:17px}
.btn:disabled{opacity:.45;cursor:default}
.row{display:flex;gap:10px;flex-wrap:wrap;align-items:center}
.muted{color:var(--muted)}
.label{font-size:14px;color:var(--muted);margin:0 0 6px;font-weight:600;display:block}
.tag{display:inline-block;font-size:13px;font-weight:700;padding:2px 9px;border-radius:5px;background:var(--warn-soft);color:var(--warn);white-space:nowrap}
.tag.done{background:var(--ok-soft);color:var(--ok)}
.track{height:6px;background:var(--line-2);border-radius:3px;overflow:hidden}
.track i{display:block;height:100%;background:var(--accent);border-radius:3px;transition:width .4s}
.back{border-radius:8px;padding:7px 12px;font-size:14px;font-weight:600;text-decoration:none;color:var(--ink);display:inline-flex;gap:6px;align-items:center;box-shadow:inset 0 0 0 1.5px var(--line)}
.back:hover{box-shadow:inset 0 0 0 1.5px var(--ink)}
.tip{font-size:14px;color:var(--muted)}
.section{margin-top:52px}
.shead{display:flex;align-items:end;justify-content:space-between;gap:12px 24px;flex-wrap:wrap;margin-bottom:18px}
.shead h2,.section > h2{font-size:40px;font-weight:900;text-transform:uppercase;font-stretch:70%}
.shead p,.section > p{margin:4px 0 0;color:var(--muted);max-width:60ch}
.section > p{margin:4px 0 16px}

/* Inicio */
.hero{position:relative;padding:28px 0 8px}
.hero h1.mark{font-size:clamp(76px,15.5vw,190px);font-stretch:68%;font-weight:900;text-transform:uppercase;letter-spacing:-.01em;line-height:.82;margin:0}
.hero .stamp-logo{position:absolute;left:clamp(380px,52%,640px);top:calc(28px + clamp(76px,15.5vw,190px)*.95);width:min(44%,470px);transform:rotate(-4deg);filter:var(--logo-filter);opacity:.95;pointer-events:none}
.hero .intro{margin:22px 0 0;font-size:19px;max-width:52ch;color:var(--ink-2)}
.hello{margin:42px 0 10px;font-size:16px;color:var(--muted);display:flex;align-items:baseline;gap:6px;flex-wrap:wrap}
.hello input{font:inherit;font-weight:700;color:var(--ink);background:transparent;border:none;border-bottom:1.5px dashed var(--line);padding:0 2px;width:13ch;max-width:100%}
.hello input:focus{outline:none;border-bottom-color:var(--accent)}
.continue{display:grid;grid-template-columns:auto minmax(0,1fr) auto;gap:8px 24px;align-items:center;border:1.5px solid var(--ink);border-radius:16px;padding:22px 24px}
.continue .unum{font-family:var(--f-display);font-stretch:68%;font-weight:900;font-size:76px;line-height:.8;color:var(--accent);font-variant-numeric:tabular-nums;grid-row:span 2}
.continue .what{font-size:15px;color:var(--muted);margin:0}
.continue h2{font-size:clamp(28px,3.6vw,40px);text-transform:uppercase;font-stretch:72%;font-weight:900}
.continue .sub{grid-column:2;margin:0;color:var(--muted);font-size:15px}
.continue .row{grid-column:3;grid-row:1/span 2;justify-content:flex-end}
.figures{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:0;margin-top:20px;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.fig{padding:18px 18px 18px 0;display:grid;gap:8px;align-content:start}
.fig + .fig{padding-left:18px;border-left:1px solid var(--line-2)}
.fig b{font-family:var(--f-display);font-stretch:72%;font-weight:900;font-size:40px;line-height:.9;font-variant-numeric:tabular-nums}
.fig b small{font-family:var(--f-body);font-stretch:100%;font-size:15px;font-weight:500;color:var(--muted);margin-left:4px}
.fig span{font-size:14.5px;color:var(--muted)}
.fig .rk{font-size:14.5px;color:var(--ink);font-weight:700}

/* Atajos */
.quick{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;margin-top:40px}
.quick a{display:grid;gap:4px;align-content:start;padding:20px 22px;text-decoration:none;color:var(--ink);border-radius:14px;background:var(--surface-2);transition:background .15s}
.quick a:hover{background:var(--brand-soft)}
.quick a:nth-child(1){background:var(--ink);color:var(--bg)}
.quick a:nth-child(1) p{color:color-mix(in srgb,var(--bg) 70%,var(--ink))}
.quick a:nth-child(1):hover{background:var(--ink-2)}
.quick .big{font-family:var(--f-display);font-stretch:70%;font-weight:900;font-size:48px;line-height:.9;margin-bottom:12px;font-variant-numeric:tabular-nums}
.quick .big.code{font-family:var(--f-code);font-stretch:100%;font-size:30px;font-weight:800;letter-spacing:-.02em;padding-top:10px;color:var(--accent)}
.quick .big.alert{color:var(--bad)}
.quick h3{font-size:22px;text-transform:uppercase;font-weight:900;font-stretch:72%}
.quick p{margin:0;font-size:14.5px;color:var(--muted)}

/* Temario: línea de tiempo */
.route{list-style:none;margin:0;padding:0;position:relative;display:grid}
.route::before{content:"";position:absolute;left:23px;top:24px;bottom:24px;width:2px;background:var(--line)}
.stop{position:relative;display:grid;grid-template-columns:48px minmax(0,1fr) 104px 104px 84px;gap:10px 12px;align-items:center;padding:12px 14px 12px 0;border-radius:12px}
.stop .pin{position:relative;z-index:1;justify-self:center;width:30px;height:30px;border-radius:50%;background:var(--bg);color:var(--muted);border:1.5px solid var(--line);display:grid;place-items:center;font-weight:700;font-size:13px;font-variant-numeric:tabular-nums}
.stop.done .pin{background:var(--ink);border-color:var(--ink);color:var(--bg)}
.stop.now .pin{background:var(--accent);border-color:var(--accent);color:var(--paint-ink);box-shadow:0 0 0 5px var(--accent-soft)}
.stop.now{background:var(--accent-soft)}
.stop .rname{min-width:0;text-decoration:none;color:var(--ink)}
.stop .rname b{display:block;font-size:17px;font-weight:700}
.stop .rname span{display:block;color:var(--muted);font-size:14px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.stop .rname:hover b{text-decoration:underline;text-decoration-color:var(--accent);text-decoration-thickness:2px;text-underline-offset:3px}
.tbtn{display:grid;gap:0;justify-items:center;text-decoration:none;border-radius:9px;padding:6px 4px;color:var(--ink);font-size:14px;font-weight:700;line-height:1.25;background:var(--bg);box-shadow:inset 0 0 0 1.5px var(--line);font-variant-numeric:tabular-nums}
.tbtn small{font-size:12px;font-weight:500;color:var(--muted)}
.tbtn:hover{box-shadow:inset 0 0 0 1.5px var(--ink)}
.tbtn.apto{background:var(--ok-soft);color:var(--ok);box-shadow:inset 0 0 0 1.5px var(--ok)}
.tbtn.noapto{background:var(--bad-soft);color:var(--bad);box-shadow:inset 0 0 0 1.5px var(--bad)}
.tbtn.apto small,.tbtn.noapto small{color:inherit;opacity:.9}
.exmini{font-size:14px;font-weight:700;text-decoration:none;color:var(--ink);text-align:right;font-variant-numeric:tabular-nums;line-height:1.25}
.exmini small{display:block;font-weight:500;font-size:12px;color:var(--muted)}
.exmini.done{color:var(--ok)}
.rlegend{display:flex;gap:16px;flex-wrap:wrap;font-size:14px;color:var(--muted)}
.rlegend span{display:inline-flex;align-items:center;gap:6px}
.rlegend i{width:12px;height:12px;border-radius:50%;display:inline-block;border:1.5px solid var(--line);background:var(--bg)}
.rlegend i.d{background:var(--ink);border-color:var(--ink)}
.rlegend i.n{background:var(--accent);border-color:var(--accent)}

.cuaderno{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:0 28px}
.cuaderno a{display:flex;gap:12px;align-items:baseline;text-decoration:none;color:var(--ink);padding:10px 2px;border-bottom:1px solid var(--line-2);font-size:15px}
.cuaderno a:hover span:nth-child(2){text-decoration:underline;text-decoration-color:var(--accent);text-decoration-thickness:2px;text-underline-offset:3px}
.cuaderno .num{font-weight:800;color:var(--muted);flex:none;font-variant-numeric:tabular-nums;width:1.6em}
.cuaderno .ok{color:var(--ok);margin-left:auto;font-weight:800}

/* Cabecera de página */
.uhead{display:flex;gap:16px;align-items:flex-end;flex-wrap:wrap;margin-bottom:22px}
.uhead .t{flex:1;min-width:240px}
.uhead h1{font-size:clamp(40px,6vw,64px);font-weight:900;text-transform:uppercase;font-stretch:68%;line-height:.9}
.uhead p{margin:6px 0 0;color:var(--muted);max-width:64ch}
.uhead .back{align-self:flex-start}
.tabs{display:flex;gap:6px;margin-bottom:22px;overflow-x:auto;border-bottom:1px solid var(--line)}
.tabs a{text-decoration:none;color:var(--muted);font-weight:700;padding:10px 12px;white-space:nowrap;position:relative}
.tabs a:hover{color:var(--ink)}
.tabs a.on{color:var(--ink)}
.tabs a.on::after{content:"";position:absolute;left:8px;right:8px;bottom:-1px;height:3px;border-radius:2px;background:var(--paint)}
.tabs a small{margin-left:6px;font-size:13px;font-weight:600;color:var(--muted);font-variant-numeric:tabular-nums}
.theory{max-width:74ch}
.theory p,.theory li{font-size:16.5px}
.theory ul{padding-left:20px;display:grid;gap:6px}
.theory pre{margin:14px 0;background:var(--code-bg);color:var(--code-fg);border-radius:10px;padding:14px 16px;font-family:var(--f-code);font-size:14px;line-height:1.65;overflow-x:auto;white-space:pre}
.testcards{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:16px}
.testcard{display:grid;gap:12px}
.testcard h3{font-size:32px;font-weight:900;text-transform:uppercase;font-stretch:70%}
.exlist{display:grid;border-top:1px solid var(--line)}
.exitem{display:grid;grid-template-columns:36px 1fr auto;gap:14px;align-items:center;text-decoration:none;color:var(--ink);padding:14px 4px;border-bottom:1px solid var(--line)}
.exitem:hover h3{text-decoration:underline;text-decoration-color:var(--paint);text-decoration-thickness:2px;text-underline-offset:3px}
.exitem .k{font-family:var(--f-display);font-weight:900;font-size:22px;color:var(--muted);font-variant-numeric:tabular-nums}
.exitem h3{font-size:18px;font-weight:700;font-stretch:100%;letter-spacing:0}
.exitem p{margin:2px 0 0;font-size:14px;color:var(--muted)}
.exitem .meta{min-width:0}

/* Lista de ejercicios por tema */
.exrows{display:grid;border-top:1px solid var(--line)}
.exrow{display:grid;grid-template-columns:40px minmax(0,1fr) 110px;gap:16px;align-items:center;padding:14px 4px;border-bottom:1px solid var(--line);text-decoration:none;color:var(--ink)}
.exrow .n{font-weight:800;color:var(--muted);font-variant-numeric:tabular-nums}
.exrow b{display:block;font-size:17px}
.exrow small{display:block;color:var(--muted);font-size:14px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.exrow:hover b{text-decoration:underline;text-decoration-color:var(--paint);text-decoration-thickness:2px;text-underline-offset:3px}
.exrow .bar{display:grid;gap:5px;font-size:13px;font-weight:700;text-align:right;font-variant-numeric:tabular-nums}
.exrow.done .track i{background:var(--ok)}

/* Motor de test */
.tstrip{display:flex;align-items:center;gap:14px;flex-wrap:wrap;margin-bottom:16px;padding-bottom:14px;border-bottom:1px solid var(--line)}
.tstrip .ttl{font-family:var(--f-display);font-stretch:72%;font-weight:900;font-size:30px;flex:1;min-width:160px;text-transform:uppercase;line-height:1}
.tstrip .ttl small{display:block;text-transform:none;line-height:1.4;font-family:var(--f-body);font-stretch:100%;font-size:14px;font-weight:500;letter-spacing:0;color:var(--muted)}
.clock{font-family:var(--f-code);font-weight:700;font-size:16px;background:var(--ink);color:var(--bg);border-radius:6px;padding:5px 10px;font-variant-numeric:tabular-nums}
.clock.low{background:var(--bad);color:#fff}
.counter{font-weight:600;color:var(--muted);font-size:15px;font-variant-numeric:tabular-nums}
.tlayout{display:grid;grid-template-columns:minmax(0,1fr) 250px;gap:20px;align-items:start}
.qbox{display:grid;gap:18px;padding:24px}
.qhead{display:grid;grid-template-columns:auto 1fr;gap:16px;align-items:start}
.qnum{min-width:42px;height:42px;padding:0 8px;border-radius:50%;background:var(--ink);color:var(--bg);display:grid;place-items:center;font-family:var(--f-display);font-weight:900;font-size:19px;font-variant-numeric:tabular-nums}
.qkind{font-size:14px;font-weight:600;color:var(--muted)}
.qtext{font-size:20px;font-weight:700;margin:2px 0 0;line-height:1.4}
pre.code{margin:0;background:var(--code-bg);color:var(--code-fg);border-radius:10px;padding:14px 0;font-family:var(--f-code);font-size:14px;line-height:1.7;overflow-x:auto}
.code .ln{display:block;padding:0 16px;white-space:pre}
.code .ln::before{content:attr(data-n);display:inline-block;width:2.4em;color:var(--tk-com);opacity:.6}
.tk-var{color:var(--tk-var)}.tk-str{color:var(--tk-str)}.tk-kw{color:var(--tk-kw);font-weight:600}.tk-num{color:var(--tk-num)}.tk-com{color:var(--tk-com);font-style:italic}
.answers{display:grid;gap:10px}
.ans{display:grid;grid-template-columns:38px 1fr auto;gap:14px;align-items:center;text-align:left;background:var(--surface);border:none;box-shadow:inset 0 0 0 1.5px var(--line);border-radius:10px;padding:10px 14px 10px 10px;font-size:16px;min-height:58px;transition:box-shadow .12s, background .12s}
.ans .lt{width:38px;height:38px;border-radius:7px;background:var(--surface-2);box-shadow:inset 0 0 0 1.5px var(--line);display:grid;place-items:center;font-family:var(--f-display);font-weight:900;font-size:17px;color:var(--muted)}
.ans .tx{font-family:var(--f-code);font-size:15px;white-space:pre-wrap;word-break:break-word}
.ans .tx.plain{font-family:var(--f-body);font-size:16.5px}
.ans .st{font-weight:700;font-size:14px}
.ans:hover:not(:disabled){box-shadow:inset 0 0 0 2px var(--ink)}
.ans.sel{box-shadow:inset 0 0 0 2px var(--ink);background:var(--paint-soft)}
.ans.sel .lt{background:var(--paint);box-shadow:none;color:var(--paint-ink)}
.ans.right{box-shadow:inset 0 0 0 2px var(--ok);background:var(--ok-soft)}
.ans.right .lt{background:var(--ok);box-shadow:none;color:#fff}
.ans.right .st{color:var(--ok)}
.ans.wrong{box-shadow:inset 0 0 0 2px var(--bad);background:var(--bad-soft)}
.ans.wrong .lt{background:var(--bad);box-shadow:none;color:#fff}
.ans.wrong .st{color:var(--bad)}
.ans:disabled{cursor:default}
.explain{border-radius:10px;padding:14px 16px;background:var(--ok-soft);display:grid;gap:4px}
.explain.bad{background:var(--bad-soft)}
.explain strong{font-family:var(--f-display);font-stretch:80%;font-size:20px}
.explain.bad strong{color:var(--bad)}
.explain:not(.bad) strong{color:var(--ok)}
.explain p{margin:0;max-width:72ch}
.hint{background:var(--paint-soft);border-radius:10px;padding:12px 14px;font-size:15px}
.tnav{display:flex;gap:10px;flex-wrap:wrap;align-items:center;border-top:1px solid var(--line-2);padding-top:16px}
.tnav .sp{flex:1}
.sheet{position:sticky;top:80px;display:grid;gap:14px}
.sheet h3{font-size:16px;font-weight:800}
.cells{display:grid;grid-template-columns:repeat(5,1fr);gap:6px}
.cell{aspect-ratio:1;max-width:100%;border:none;box-shadow:inset 0 0 0 1.5px var(--line);border-radius:50%;background:var(--surface-2);font-weight:700;font-size:13px;display:grid;place-items:center;color:var(--muted);padding:0;font-variant-numeric:tabular-nums}
.cell.answered{background:var(--paint);box-shadow:none;color:var(--paint-ink)}
.cell.right{background:var(--ok);box-shadow:none;color:#fff}
.cell.wrong{background:var(--bad);box-shadow:none;color:#fff}
.cell.cur{outline:2px solid var(--ink);outline-offset:2px}
.legend{display:grid;gap:5px;font-size:13px;color:var(--muted)}
.legend span{display:flex;gap:7px;align-items:center}
.legend i{width:12px;height:12px;border-radius:50%;border:1.5px solid var(--line);display:inline-block;background:var(--surface-2)}
.kbd{font-size:13px;color:var(--muted);line-height:1.9}
.kbd kbd{font-family:var(--f-code);font-size:11px;border:1px solid var(--line);border-bottom-width:2px;border-radius:4px;padding:0 5px;background:var(--surface)}

/* Resultado */
.result{display:grid;gap:18px;justify-items:center;text-align:center;padding:36px 20px}
.stamp{font-family:var(--f-display);font-stretch:70%;text-transform:uppercase;font-weight:900;font-size:clamp(44px,9vw,80px);letter-spacing:-.02em;padding:4px 26px 8px;border:6px solid currentColor;border-radius:12px;transform:rotate(-3deg);line-height:1}
.stamp.apto{color:var(--ok)}
.stamp.noapto{color:var(--bad)}
.stamp.neutral{color:var(--ink)}
.foot img{height:18px;width:auto;filter:var(--logo-filter);opacity:.85}
.rstats{display:flex;gap:0;flex-wrap:wrap;justify-content:center;border:1px solid var(--line);border-radius:12px;overflow:hidden}
.rstat{padding:12px 22px;min-width:110px;border-left:1px solid var(--line-2)}
.rstat:first-child{border-left:none}
.rstat b{display:block;font-family:var(--f-display);font-stretch:72%;font-size:36px;font-weight:900;font-variant-numeric:tabular-nums}
.rstat span{font-size:14px;color:var(--muted)}
.rstat.ok b{color:var(--ok)}.rstat.bad b{color:var(--bad)}
.review{display:grid;gap:14px;width:100%;max-width:860px;text-align:left}
.rq{display:grid;gap:12px}
.rq .ans{min-height:48px}

/* Editor y ejercicios */
.hud{display:flex;align-items:center;gap:14px;flex-wrap:wrap;margin-bottom:16px}
.hud .lvl{font-weight:600;color:var(--muted);font-size:15px;flex:1;min-width:160px}
.exwrap{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.3fr);gap:20px;align-items:start}
.exwrap > *{min-width:0}
.statement{display:grid;gap:14px;position:sticky;top:80px}
.statement h1{font-size:34px;font-weight:900;text-transform:uppercase;font-stretch:72%}
.statement .st{font-size:16.5px}
.given{background:var(--surface-2);border:1px dashed var(--line);border-radius:10px;padding:10px 12px;font-size:14px}
.given pre{margin:6px 0 0;font-family:var(--f-code);font-size:13px;white-space:pre-wrap;word-break:break-word}
.rules{font-size:14px;color:var(--muted);display:grid;gap:4px;padding-left:18px;margin:0}
.editor{border-radius:12px;overflow:hidden;background:var(--code-bg);box-shadow:0 0 0 1px var(--code-line)}
.editor .bar{display:flex;align-items:center;gap:8px;flex-wrap:wrap;background:var(--code-gutter);padding:8px 10px;border-bottom:1px solid var(--code-line)}
.editor .bar .file{font-family:var(--f-code);font-size:12px;color:#8A93A3;flex:1}
.editor .bar .btn{padding:7px 13px;font-size:14px}
.editor .bar .btn.ghost{background:transparent;color:#DADDE3;box-shadow:inset 0 0 0 1.5px #3D434D}
.editor .bar .btn.ghost:hover{box-shadow:inset 0 0 0 1.5px #8A93A3}
.status{font-family:var(--f-code);font-size:11px;color:#8A93A3;display:inline-flex;gap:6px;align-items:center}
.status i{width:8px;height:8px;border-radius:50%;background:#F2C661;display:inline-block}
.status.ready i{background:#43C676}
.status.err i{background:#FF6B70}
.CodeMirror{height:auto;min-height:280px;font-family:var(--f-code);font-size:14px;line-height:1.6}
.CodeMirror-scroll{min-height:280px;max-height:65vh}
.cm-s-pq.CodeMirror{background:var(--code-bg);color:var(--code-fg)}
.cm-s-pq .CodeMirror-gutters{background:var(--code-gutter);border-right:1px solid var(--code-line)}
.cm-s-pq .CodeMirror-linenumber{color:#5C6573}
.cm-s-pq .CodeMirror-cursor{border-left:2px solid #A9B3FF}
.cm-s-pq .CodeMirror-selected,.cm-s-pq.CodeMirror-focused .CodeMirror-selected{background:#3A404B}
.cm-s-pq .CodeMirror-activeline-background{background:rgba(255,255,255,.035)}
.cm-s-pq .cm-keyword{color:#FF9FC9;font-weight:600}
.cm-s-pq .cm-variable-2{color:#8EC5FF}
.cm-s-pq .cm-variable,.cm-s-pq .cm-def{color:#E8EAEE}
.cm-s-pq .cm-string{color:#FFD36B}
.cm-s-pq .cm-number,.cm-s-pq .cm-atom{color:#8DE2B2}
.cm-s-pq .cm-comment{color:#8A93A3;font-style:italic}
.cm-s-pq .cm-meta{color:#FF9FC9}
.cm-s-pq .cm-builtin{color:#7FD3EA}
.cm-s-pq .cm-operator{color:#CDD2DA}
.cm-s-pq .cm-tag{color:#FF9FC9}.cm-s-pq .cm-attribute{color:#8EC5FF}
.cm-s-pq .CodeMirror-matchingbracket{color:#fff!important;background:#3A404B}
.console{background:var(--code-bg);border-top:1px solid var(--code-line);color:var(--code-fg);font-family:var(--f-code);font-size:13px;padding:12px 14px;min-height:70px;white-space:pre-wrap;word-break:break-word;max-height:300px;overflow:auto}
.console .err{color:#FF959B}
.console .dim{color:#8A93A3}
.tests{display:grid;gap:8px;margin-top:14px}
.test{border:1px solid var(--line);border-radius:10px;background:var(--surface);overflow:hidden}
.test summary{display:flex;align-items:center;gap:10px;padding:10px 12px;cursor:pointer;font-weight:700;list-style:none}
.test summary::-webkit-details-marker{display:none}
.test .mark{width:22px;height:22px;border-radius:50%;display:grid;place-items:center;font-size:13px;color:#fff;flex:none}
.test.pass .mark{background:var(--ok)}
.test.fail .mark{background:var(--bad)}
.test .body{display:grid;gap:8px;padding:0 12px 12px;font-size:14px}
.test .body pre{margin:0;background:var(--surface-2);border-radius:8px;padding:8px 10px;font-family:var(--f-code);font-size:13px;white-space:pre-wrap;word-break:break-word}
.verdict{border-radius:10px;padding:13px 16px;font-weight:800;margin-top:12px}
.verdict.ok{background:var(--ok-soft);color:var(--ok)}
.verdict.bad{background:var(--bad-soft);color:var(--bad)}
.verdict p{margin:4px 0 0;font-weight:400;color:var(--ink)}
.lab{display:grid;grid-template-columns:minmax(0,1.3fr) minmax(0,1fr);gap:20px;align-items:start}
.lab > *{min-width:0}
.side{display:grid;gap:12px}
.side textarea,.side select,.side input{width:100%;font-family:var(--f-code);font-size:13px;border:1px solid var(--line);background:var(--surface-2);color:var(--ink);border-radius:8px;padding:8px 10px}
.out-tabs{display:flex;gap:4px;padding:6px 8px;background:var(--code-gutter);border-top:1px solid var(--code-line)}
.out-tabs button{background:none;border:none;color:#8A93A3;font-family:var(--f-code);font-size:12px;padding:4px 8px;border-radius:6px}
.out-tabs button.on{background:var(--code-line);color:#E8EAEE}
.webview{width:100%;min-height:180px;border:0;background:#fff;display:block}

/* Exámenes y progreso */
.checks{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:6px;margin:12px 0 18px}
.checks label{display:flex;gap:9px;align-items:center;font-size:14.5px;border-radius:8px;padding:7px 10px;box-shadow:inset 0 0 0 1px var(--line);cursor:pointer}
.checks label:has(input:checked){background:var(--accent-soft);box-shadow:none}
.checks input{accent-color:var(--ink);width:16px;height:16px}
.dgt{display:flex;flex-wrap:wrap;gap:0;margin:0 0 20px;border:1px solid var(--line);border-radius:12px;overflow:hidden}
.dgt div{flex:1;min-width:150px;padding:14px 18px;border-left:1px solid var(--line-2)}
.dgt div:first-child{border-left:none}
.dgt b{display:block;font-family:var(--f-display);font-stretch:70%;font-size:44px;font-weight:900;letter-spacing:-.02em;font-variant-numeric:tabular-nums}
.dgt span{font-size:14px;color:var(--muted)}
table.prog{width:100%;border-collapse:collapse;font-size:14.5px}
table.prog th,table.prog td{text-align:left;padding:10px 10px;border-bottom:1px solid var(--line-2)}
table.prog th{font-size:13px;color:var(--muted);font-weight:600}
table.prog td.n{font-variant-numeric:tabular-nums}
table.prog a{text-decoration:none;font-weight:600}
table.prog a:hover{text-decoration:underline;text-decoration-color:var(--paint)}
.pill{font-size:13px;font-weight:700;padding:2px 8px;border-radius:5px;white-space:nowrap;font-variant-numeric:tabular-nums}
.pill.apto{background:var(--ok-soft);color:var(--ok)}.pill.noapto{background:var(--bad-soft);color:var(--bad)}
.scroll{overflow-x:auto}
textarea.code-io{width:100%;min-height:90px;font-family:var(--f-code);font-size:12px;border:1px solid var(--line);background:var(--surface-2);color:var(--ink);border-radius:8px;padding:10px}
.toast{position:fixed;left:50%;bottom:calc(24px + env(safe-area-inset-bottom,0px));transform:translateX(-50%);background:var(--ink);color:var(--bg);padding:10px 16px;border-radius:8px;font-weight:600;z-index:60;box-shadow:0 8px 24px rgba(0,0,0,.2);border-left:4px solid var(--accent)}
.confirm{display:grid;gap:10px;background:var(--paint-soft);border-radius:10px;padding:14px 16px}
.foot{margin-top:72px;padding-top:24px;border-top:1px solid var(--line);align-items:center;font-size:14px;color:var(--muted);display:flex;gap:10px;justify-content:space-between;flex-wrap:wrap}
.foot strong{color:var(--ink)}

/* Manual */
.manual{display:grid;grid-template-columns:250px minmax(0,1fr);gap:32px;align-items:start}
.mside{position:sticky;top:80px;max-height:calc(100vh - 100px);overflow:auto;padding:4px 4px 12px 0}
.mside summary{font-weight:800;cursor:pointer;padding:2px 4px}
.mside nav{display:grid;gap:16px;margin-top:10px}
.mgroup{display:grid;gap:1px}
.mgroup .label{margin:0 0 4px 10px;font-size:13px}
.mgroup > a{text-decoration:none;color:var(--ink);font-size:14.5px;padding:5px 10px;border-radius:6px}
.mgroup > a:hover{background:var(--surface-2)}
.mgroup > a.on{background:var(--surface-2);font-weight:700;box-shadow:inset 3px 0 0 var(--accent)}
.msub{display:grid;margin:2px 0 6px 14px;border-left:1px dashed var(--line)}
.msub a{text-decoration:none;color:var(--muted);font-size:13.5px;padding:3px 10px}
.msub a:hover{color:var(--ink)}
.mcontent{min-width:0}
.mcontent h1{font-size:clamp(38px,5vw,56px);font-weight:900;text-transform:uppercase;font-stretch:70%;line-height:.92;margin:2px 0 14px}
.mtoc{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:16px}
.mtoc a{text-decoration:none;font-size:14px;font-weight:600;color:var(--ink);padding:4px 10px;border-radius:6px;box-shadow:inset 0 0 0 1px var(--line)}
.mtoc a:hover{box-shadow:inset 0 0 0 1.5px var(--ink)}
.mtext{max-width:78ch}
.mtext h2{font-size:25px;font-weight:800;margin:36px 0 8px;scroll-margin-top:84px;padding-top:16px;border-top:1px dashed var(--line)}
.mtext p{margin:10px 0}
.note{background:var(--paint-soft);border-radius:8px;padding:11px 14px;margin:14px 0;font-size:15px}
.tablewrap{overflow-x:auto;margin:12px 0}
table.mt{border-collapse:collapse;width:100%;font-size:14px;background:var(--surface);border:1px solid var(--line)}
table.mt th{background:var(--ink);color:var(--bg);text-align:left;padding:8px 10px;font-weight:700}
table.mt td{padding:7px 10px;border-top:1px solid var(--line-2);vertical-align:top}
table.mt td:first-child{font-family:var(--f-code);font-size:13px;white-space:nowrap}
.ex{margin:14px 0;border:1px solid var(--line);border-radius:10px;overflow:hidden;background:var(--surface)}
.ex pre.code{margin:0;border-radius:0}
.ex pre.plain{padding:14px 16px;white-space:pre;position:relative}
.ex pre.plain .lang{position:absolute;top:6px;right:10px;font-size:11px;color:#8A93A3}
.exout{padding:10px 14px;border-top:1px solid var(--line);background:var(--surface-2)}
.exout .label{margin:0 0 4px;font-size:13px}
.exout .render{font-family:var(--f-code);font-size:13px;line-height:1.55;white-space:pre-wrap;word-break:break-word}
.exout .render h2{font-family:var(--f-display);font-size:20px;margin:4px 0;white-space:normal;border:none;padding:0}
.exout .render table{border-collapse:collapse}
.exbar{padding:8px 12px;border-top:1px solid var(--line);display:flex;justify-content:flex-end}
.practice{display:flex;gap:14px;align-items:center;justify-content:space-between;flex-wrap:wrap;background:var(--surface-2);color:var(--ink);border-radius:12px;padding:16px 18px;margin-top:32px;max-width:78ch}
.practice p{margin:2px 0 0;font-size:14px;color:var(--muted)}

@keyframes shake{0%,100%{transform:translateX(0)}25%{transform:translateX(-5px)}75%{transform:translateX(5px)}}
@keyframes pop{0%{transform:scale(.99);opacity:.6}100%{transform:scale(1);opacity:1}}
@keyframes stampIn{0%{transform:rotate(-3deg) scale(1.5);opacity:0}100%{transform:rotate(-3deg) scale(1);opacity:1}}
.shake{animation:shake .3s}.pop{animation:pop .18s ease-out}.stamp{animation:stampIn .35s ease-out}
@media (prefers-reduced-motion: reduce){*{animation:none!important;transition:none!important}}

@media (max-width:980px){
  .auth{grid-template-columns:1fr;gap:28px;min-height:0}
  .auth-side .mark{font-size:clamp(64px,20vw,120px)}
  .tlayout{grid-template-columns:1fr}
  .sheet{position:static}
  .cells{grid-template-columns:repeat(10,1fr)}
  .exwrap,.lab,.hero,.manual{grid-template-columns:1fr}
  .hero{gap:28px}
  .statement,.mside{position:static;max-height:none}
  .mside{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:12px}
}
@media (max-width:760px){
  .wrap{padding-inline:16px}
  .hero h1.mark{font-size:22vw}
  .topbar .in{flex-wrap:wrap;padding:10px 16px 8px}
  .nav{order:3;flex-basis:100%;margin-inline:-8px}
  .nav a{padding:6px 9px;font-size:14.5px}
  .xp{margin-left:auto}
  .topbar .in{gap:4px 14px}
  .bname{display:none}
  .who{max-width:110px;padding:4px 9px 4px 8px;font-size:13px}
  .hero .stamp-logo{position:static;display:block;width:78%;margin:18px 0 0 6px}
  .hero .intro{font-size:17px}
  .continue{grid-template-columns:auto minmax(0,1fr);padding:18px}
  .continue .unum{grid-row:1;font-size:52px}
  .continue .what{grid-column:2;grid-row:1;align-self:center}
  .continue h2{grid-column:1/-1;grid-row:2;margin-top:6px}
  .continue .sub{grid-column:1/-1;grid-row:3}
  .continue .row{grid-column:1/-1;grid-row:4;justify-content:flex-start;margin-top:8px}
  .figures{grid-template-columns:1fr 1fr}
  .fig:nth-child(3){padding-left:0;border-left:none}
  .fig:nth-child(n+3){border-top:1px solid var(--line-2)}
  .fig b{font-size:34px}
  .quick{grid-template-columns:1fr;gap:10px}
  .quick a{grid-template-columns:96px 1fr;column-gap:14px;padding:16px 18px}
  .quick .big{grid-row:span 2;margin:0;font-size:36px;align-self:center}
  .quick .big.code{font-size:19px;padding:0}
  .shead h2,.section > h2{font-size:34px}
  .stop{grid-template-columns:48px minmax(0,1fr) minmax(0,1fr) 64px;padding-right:8px}
  .stop .rname{grid-column:2/-1}
  .stop .pin{grid-row:span 2;align-self:start;margin-top:2px}
  .stop .exmini{text-align:center}
  .exrow{grid-template-columns:30px minmax(0,1fr) 70px;gap:10px}
  .qtext{font-size:18px}
  .qbox{padding:18px}
  .cells{grid-template-columns:repeat(5,1fr)}
  .exitem{grid-template-columns:30px 1fr}
  .exitem .tag{grid-column:2;justify-self:start}
  .rstat{min-width:0;flex:1 1 40%;padding:10px 14px}
}
/* sin ligaduras en el código: que == y != se vean tal cual */
pre,code,.ans .tx,.CodeMirror,.console,.given pre,textarea,input,.quick .big.code{font-variant-ligatures:none;font-feature-settings:"liga" 0,"calt" 0}