/* Identidad Ingenia: crema, naranja de marca y negro. Una columna de lectura, un ejercicio a la vez. */
:root{
  --bg:#FFF8F2; --surface:#ffffff; --ink:#161714; --muted:#5A544C; --line:#E4D6C6;
  --accent:#FF914D; --accent-ink:#161714; --accent-text:#B34700; --focus:#1F3A66;
  --good:#145A2B; --good-bg:#DDF2E3; --bad:#8A1410; --bad-bg:#FDE2E0; --warn-bg:#FFF1CC;
  --font-display:'Segoe UI',system-ui,-apple-system,Roboto,sans-serif;
  --font-body:'Segoe UI',system-ui,-apple-system,Roboto,sans-serif;
  color-scheme:light;
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --bg:#161714; --surface:#221f1b; --ink:#FFF8F2; --muted:#C9BDAE; --line:#3d362e;
    --accent:#FF914D; --accent-ink:#161714; --accent-text:#FF914D; --focus:#FFD7B8;
    --good:#5ad394; --good-bg:#12301f; --bad:#ff8a80; --bad-bg:#3a1a18; --warn-bg:#3a2f12;
    color-scheme:dark;
  }
}
:root[data-theme="dark"]{
  --bg:#161714; --surface:#221f1b; --ink:#FFF8F2; --muted:#C9BDAE; --line:#3d362e;
  --accent:#FF914D; --accent-ink:#161714; --accent-text:#FF914D; --focus:#FFD7B8;
  --good:#5ad394; --good-bg:#12301f; --bad:#ff8a80; --bad-bg:#3a1a18; --warn-bg:#3a2f12;
  color-scheme:dark;
}
*{box-sizing:border-box}
html,body{margin:0}
body{background:var(--bg);color:var(--ink);font-family:var(--font-body);font-size:18px;line-height:1.5}
.wrap{max-width:760px;margin:0 auto;padding:20px 16px 48px;display:flex;flex-direction:column;gap:16px}
header{display:flex;flex-wrap:wrap;gap:12px;justify-content:space-between;align-items:flex-start}
h1{font-family:var(--font-display);font-weight:600;font-size:1.5rem;margin:0;text-wrap:balance}
header p{margin:4px 0 0;color:var(--muted);font-size:.95rem;max-width:46ch}
.toggle{display:flex;align-items:center;gap:8px;font-size:.9rem;color:var(--muted);cursor:pointer}
.toggle input{width:18px;height:18px;accent-color:var(--accent)}
.steps{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(4,1fr);gap:8px}
.step{background:var(--surface);border:1px solid var(--line);border-radius:10px;padding:8px 10px;font-size:.82rem;line-height:1.3;border-top:4px solid var(--line)}
.step b{display:block;font-family:var(--font-display);font-weight:500;font-size:.85rem}
.step span{color:var(--muted)}
.step.now{border-top-color:var(--accent)}
.step.ok{border-top-color:var(--good)}
.step.ref{border-top-color:#c98a00}
.step.pend{border-top-color:var(--bad)}
.card{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:20px;display:flex;flex-direction:column;gap:16px}
.meta{display:flex;flex-wrap:wrap;gap:8px}
.chip{font-size:.8rem;padding:2px 10px;border-radius:999px;border:1px solid var(--line);color:var(--muted)}
.chip.skill{background:var(--accent);color:var(--accent-ink);border-color:var(--accent);font-weight:700}
.chip.alt{background:var(--warn-bg);color:var(--ink);border-color:transparent}
.stem{margin:0;font-size:1.1rem}
.opts{display:flex;flex-direction:column;gap:10px}
.opt{display:flex;gap:12px;align-items:flex-start;text-align:left;width:100%;font:inherit;color:inherit;background:var(--surface);border:2px solid var(--line);border-radius:10px;padding:10px 12px;cursor:pointer}
.opt:hover:not([disabled]){border-color:var(--accent)}
.opt:focus-visible,.btn:focus-visible,.toggle input:focus-visible,summary:focus-visible{outline:3px solid var(--focus);outline-offset:2px}
.opt .let{flex:none;width:30px;height:30px;border-radius:50%;border:2px solid var(--line);display:grid;place-items:center;font-weight:700;font-size:.9rem}
.opt.sel{border-color:var(--accent)}
.opt.sel .let{background:var(--accent);color:var(--accent-ink);border-color:var(--accent)}
.opt.right{border-color:var(--good);background:var(--good-bg)}
.opt.right .let{background:var(--good);color:var(--surface);border-color:var(--good)}
.opt.wrong{border-color:var(--bad);background:var(--bad-bg)}
.opt.wrong .let{background:var(--bad);color:var(--surface);border-color:var(--bad)}
.opt[disabled]{cursor:default}
.opt .txt{flex:1;padding-top:2px}
.opt .mark{flex:none;font-weight:700;font-size:.85rem;padding-top:4px}
.right .mark{color:var(--good)} .wrong .mark{color:var(--bad)}
.tag{display:block;margin-top:4px;font-size:.78rem;color:var(--muted);font-style:italic}
.actions{display:flex;gap:10px;flex-wrap:wrap}
.btn{font:inherit;font-weight:700;border-radius:10px;padding:10px 18px;cursor:pointer;border:2px solid var(--accent);background:var(--accent);color:var(--accent-ink)}
.btn.ghost{background:transparent;color:var(--accent-text)}
.btn[disabled]{opacity:.45;cursor:not-allowed}
.fb{border-radius:10px;padding:14px 16px;display:flex;flex-direction:column;gap:10px}
.fb.good{background:var(--good-bg);border:1px solid var(--good)}
.fb.bad{background:var(--bad-bg);border:1px solid var(--bad)}
.fb h2{font-family:var(--font-display);font-weight:600;font-size:1.05rem;margin:0}
.fb p{margin:0}
.fb .sol{background:var(--surface);border-radius:8px;padding:10px 12px;display:flex;flex-direction:column;gap:6px}
.fb .sol p{margin:0}
.hint b{font-weight:700}
.frac{display:inline-flex;flex-direction:column;align-items:center;vertical-align:middle;margin:0 .15em;line-height:1.15;font-variant-numeric:tabular-nums}
.frac>span:first-child{border-bottom:1.5px solid currentColor;padding:0 .25em .05em}
.frac>span:last-child{padding:.05em .25em 0}
.sum{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
.tile{background:var(--bg);border-radius:10px;padding:10px 12px}
.tile b{display:block;font-family:var(--font-display);font-size:1.6rem;font-weight:600;font-variant-numeric:tabular-nums}
.tile span{font-size:.85rem;color:var(--muted)}
.tablewrap{overflow-x:auto}
table{border-collapse:collapse;width:100%;font-size:.92rem}
th,td{text-align:left;padding:8px 10px;border-bottom:1px solid var(--line);vertical-align:top}
th{font-size:.8rem;color:var(--muted);font-weight:700}
.teacher{background:var(--surface);border:1px dashed var(--accent);border-radius:14px;padding:16px;display:flex;flex-direction:column;gap:8px;font-size:.9rem}
.teacher h2{font-family:var(--font-display);font-weight:600;font-size:1rem;margin:0}
.teacher p{margin:0;color:var(--muted)}
pre{margin:0;background:var(--bg);border-radius:8px;padding:10px 12px;overflow-x:auto;font-size:.78rem;line-height:1.45;max-height:280px}
details>summary{cursor:pointer;font-weight:700}
.foot{font-size:.82rem;color:var(--muted)}
.lg{display:flex;align-items:center;gap:10px;margin-bottom:10px}
.logo{height:78px;width:auto;background:#FFF8F2;border-radius:12px;padding:6px;display:block}
.pal{font-family:Impact,"Arial Black",sans-serif;font-size:1.8rem;letter-spacing:.02em;line-height:1;display:block}
.pal .i{color:var(--ink)} .pal .g{color:#FF914D}
.sub{display:block;font-size:.8rem;color:var(--muted);font-weight:700;margin-top:2px}
.dt{width:auto;min-width:260px;margin:4px 0}
.dt th,.dt td{border:1px solid var(--ink);text-align:center;padding:6px 16px;font-variant-numeric:tabular-nums}
.dt th{color:var(--ink);font-size:.88rem}
.fig{margin:8px 0}
.bp{width:100%;height:auto;max-width:560px;display:block}
.bp text{fill:var(--ink);font-size:13px;font-family:var(--font-body)}
.bp .ax,.bp .bx{stroke:var(--ink);stroke-width:1.6}
.bp .gd{stroke:var(--line);stroke-width:1}
.bp .bxf{fill:var(--line);stroke:var(--ink);stroke-width:2}
.stem p{margin:0 0 8px}

.brand{font-size:.8rem;letter-spacing:.08em;text-transform:uppercase;color:var(--accent);font-weight:700;margin:0 0 4px}
.hd-right{display:flex;flex-direction:column;align-items:flex-end;gap:8px}
.how{margin:0;padding-left:1.2em;display:flex;flex-direction:column;gap:8px}
.btn.sm{padding:6px 12px;font-size:.85rem}
@media (max-width:520px){.steps{grid-template-columns:repeat(2,1fr)}.sum{grid-template-columns:1fr}}
@media (prefers-reduced-motion:no-preference){.fb{animation:in .2s ease-out}@keyframes in{from{opacity:.4;transform:translateY(4px)}to{opacity:1;transform:none}}}

/* Plataforma de práctica */
.logo{height:64px}
.field{display:flex;flex-direction:column;gap:6px}
.field label{font-weight:700}
.inp{font:inherit;padding:10px 12px;border:2px solid var(--line);border-radius:10px;background:var(--surface);color:var(--ink);width:100%}
.inp:focus-visible{outline:3px solid var(--focus);outline-offset:2px;border-color:var(--accent)}
.code{font-family:ui-monospace,Consolas,monospace;letter-spacing:.12em;text-transform:uppercase}
.err{color:var(--bad);font-weight:700;margin:0}
.okmsg{color:var(--good);font-weight:700;margin:0}
.choose{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.choose .btn{padding:18px;text-align:left;font-size:1.05rem;display:flex;flex-direction:column;gap:4px}
.choose .btn span{font-weight:400;font-size:.88rem}
.banner{background:var(--warn-bg);border-radius:10px;padding:10px 14px;font-size:.9rem}
.tabs{display:flex;gap:8px;flex-wrap:wrap}
.tabs .btn{padding:8px 16px}
.tabs .btn[aria-selected="false"]{background:transparent;color:var(--accent-text)}
.row{display:flex;gap:10px;flex-wrap:wrap;align-items:end}
.row .field{flex:1;min-width:150px}
.big{font-family:ui-monospace,Consolas,monospace;font-size:1.5rem;letter-spacing:.12em;background:var(--bg);border-radius:10px;padding:12px;word-break:break-all}
.pill{font-size:.78rem;padding:2px 8px;border-radius:999px;font-weight:700}
.pill.on{background:var(--good-bg);color:var(--good)} .pill.off{background:var(--bad-bg);color:var(--bad)}
.verdict{border-left:5px solid var(--accent);background:var(--surface);border-radius:10px;padding:12px 16px}
.verdict h3{margin:0 0 6px;font-family:var(--font-display);font-size:1.05rem}
.legend{display:flex;gap:16px;flex-wrap:wrap;font-size:.85rem;color:var(--muted)}
.legend i{display:inline-block;width:12px;height:12px;border-radius:3px;margin-right:6px;vertical-align:-1px}
.chart svg{width:100%;height:auto;display:block}
.chart text{fill:var(--muted);font-size:11px}
.tip{position:fixed;pointer-events:none;background:var(--ink);color:var(--bg);padding:6px 10px;border-radius:8px;font-size:.82rem;z-index:9;max-width:260px}
.sk{display:grid;grid-template-columns:110px 1fr 52px;gap:10px;align-items:center;font-size:.9rem}
.sk .bar{height:14px;background:var(--line);border-radius:7px;overflow:hidden}
.sk .bar i{display:block;height:100%;background:#2D5F9A}
.stat-ok{color:var(--good)} .stat-warn{color:#8a5a00} .stat-bad{color:var(--bad)}
@media (max-width:520px){.choose{grid-template-columns:1fr}.sk{grid-template-columns:90px 1fr 46px}}

.gfx{width:100%;height:auto;max-width:240px;display:block;margin:0 auto}
.fig{overflow-x:auto;max-width:100%}
.tbl{border-collapse:collapse;margin:0 auto;width:100%;max-width:420px;font-variant-numeric:tabular-nums;font-size:.85rem}
.tbl th,.tbl td{border:1px solid var(--line);padding:4px 3px;text-align:center}
.tbl thead th{background:var(--surface);font-weight:600}
.tbl16 td:first-child{text-align:left}
.rad{border-top:1.5px solid currentColor;padding:0 .12em;margin-left:1px}
sup.sf{display:inline-block;vertical-align:baseline;transform:translateY(-.75em);font-size:.8em;line-height:1}
sup.sf .frac{font-size:1em;margin:0 .05em}

.h2{font-family:var(--font-display);font-weight:600;margin:0;font-size:1.1rem}
.h3{font-family:var(--font-display);font-weight:600;margin:6px 0 0;font-size:1rem}
.rows{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:14px}
.rows li{display:flex;flex-direction:column;gap:4px}
.rl{display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap}
.rl b{font-variant-numeric:tabular-nums}
.bar{height:10px;background:var(--bg);border:1px solid var(--line);border-radius:6px;overflow:hidden}
.bar>i{display:block;height:100%;background:var(--accent)}
.sug{margin:0;padding-left:1.2em;display:flex;flex-direction:column;gap:8px}

.filtro{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:12px}.filtro .field{margin:0}.filtro select.inp{width:100%}
@media (max-width:520px){.filtro{grid-template-columns:1fr}}
.sr{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}

.key{display:inline-block;min-width:1.6em;padding:1px 7px;margin:0 1px;border:1.5px solid #333;border-bottom-width:3px;border-radius:6px;background:#f2f2f2;color:#111;font-weight:700;text-align:center}
.gfx{max-width:100%;height:auto;vertical-align:middle}
.opt .gfx{display:block}

/* Temas desplegables en el panel de bloques */
details.eje{margin:12px 0;border:1px solid var(--line);border-radius:14px;background:var(--surface)}
details.eje>summary{list-style:none;cursor:pointer;display:flex;align-items:center;gap:10px;min-height:48px;padding:10px 14px;font-family:var(--font-display);font-weight:600;font-size:1.05rem}
details.eje>summary::-webkit-details-marker{display:none}
details.eje>summary::before{content:'';width:9px;height:9px;border-right:2.5px solid currentColor;border-bottom:2.5px solid currentColor;transform:rotate(45deg) translate(-2px,-2px);transition:transform .15s;flex:none;margin-right:2px}
details.eje[open]>summary::before{transform:rotate(-135deg) translate(-2px,-2px)}
details.eje>summary small{margin-left:auto;font-weight:400;font-size:.85rem;opacity:.7}
details.eje>summary:focus-visible{outline:3px solid var(--focus);outline-offset:2px;border-radius:14px}
details.eje>.choose{padding:0 12px 12px}
details.eje>.foot{padding:0 14px 14px;margin:0}
@media (prefers-reduced-motion:reduce){details.eje>summary::before{transition:none}}
.sk.tm{grid-template-columns:minmax(120px,42%) 1fr 52px}
/* Las figuras se dibujan en negro sobre blanco (estilo DEMRE): fondo blanco fijo para que se vean igual en modo oscuro */
.gfx{background:#fff;border:1px solid #cfcfcf;border-radius:8px;padding:2px}
.fig .gfx{max-width:min(100%,480px)}
.opt .gfx{max-width:min(100%,300px)}

.paes{display:flex;align-items:baseline;gap:10px;flex-wrap:wrap;margin:10px 0 4px;padding:10px 12px;border-radius:10px;background:var(--bg);border:1px solid var(--line)}
.paes b{font-family:var(--font-display);font-size:1.7rem;font-weight:600;font-variant-numeric:tabular-nums}
.paes span{color:var(--muted);font-size:.9rem}
.banner .msg{margin:8px 0}
.banner .rl{display:flex;justify-content:space-between;gap:8px;margin:6px 0 4px;font-size:.9rem}

.grid4{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:8px 0}
.tbl2 b{display:block;text-align:center;font-size:.85rem;margin-bottom:2px}
.tbl2 .tbl{max-width:none}

.tbl+p{margin-top:12px}