/* Reading and navigation refinements; original course design and content retained. */
body{font-size:16px}.ux-location{color:var(--muted);font-size:14px;margin:0 0 8px}.ux-lead{font-size:16px;line-height:1.7;color:var(--text);margin-top:14px;max-width:80ch}.route button{min-height:44px}.route button[aria-current=true]{border-color:var(--navy);background:var(--accent)}.pagenav{border-top:1px solid var(--line);padding-top:20px;margin-top:28px;gap:12px}.pagenav .btn{min-height:44px}.hint{line-height:1.6}.tbl{max-width:100%;overscroll-behavior-x:contain}.tbl table{font-size:14px}.tbl th{font-size:13px}.file .nm small{overflow-wrap:anywhere}.inp{font-size:16px}.pbox{overflow:visible}.pbox-h{position:sticky;top:calc(env(safe-area-inset-top,0px) + var(--ux-header-height,80px));z-index:10;background:var(--bg);border-radius:14px 14px 0 0}.pbox pre{font-size:15px;line-height:1.75}.pbox textarea{font-size:16px;max-width:100%}.tabs button{font-size:15px}:focus-visible{outline:3px solid var(--navy);outline-offset:3px}main:focus{outline:none}
@media(max-width:960px){.side{max-height:none}.pbox-h{position:static}}
@media(max-width:600px){.top-in{padding:12px 16px;gap:10px}.brand b{font-size:16px}.shell{padding:16px 14px 50px;gap:20px}.side h2{font-size:17px;margin-bottom:10px}.route{flex-direction:row;overflow-x:auto;padding:4px 2px 10px;overscroll-behavior-x:contain}.route li{flex:none;max-width:225px}.route button{grid-template-columns:26px minmax(0,1fr);padding:9px 10px;min-height:44px}.route .tt{font-size:14px}.side-actions{margin-top:8px;padding-top:10px}.side-actions .btn{justify-content:center}.grid.g2,.grid.g3{grid-template-columns:minmax(0,1fr)}.card{padding:18px}.pbox-h .acts{flex-wrap:wrap}.pagenav .btn{white-space:normal;font-size:13px}.pagenav{align-items:stretch}.pbox pre{padding:14px;font-size:14px}.tbl th,.tbl td{padding:9px}.tabs button{padding:12px;min-width:110px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}

/* Caso 1: espacio suficiente para leer y editar las reglas. */
textarea[id="b1:0reglas"]{min-height:120px}
@media(max-width:900px){textarea[id="b1:0reglas"]{min-height:240px}}
@supports(field-sizing:content){textarea[id="b1:0reglas"]{field-sizing:content;height:auto;min-height:100px}}

/* Ajusta los campos al texto, sin reservar espacio vacío. */
@supports(field-sizing:content){.builder textarea{field-sizing:content;height:auto;min-height:72px}}

/* Texto que guía el aprendizaje: lectura consistente en ambos días. */
.tl,.hint,.crow span,.ck span,.fcard p,.fcard ul,.fcard .ex,
.flow .ins .fcard p,.note,.chatnote,.microbox,.key,.takes,
.case .enc .rule,.aviso dt,.aviso dd{font-size:16px;line-height:1.6}
.tbl table,.tbl th,.tbl td{font-size:16px;line-height:1.5}

/* Pestañas y textos de trabajo con una jerarquía legible. */
.tabs button{font-size:19px}
.casetabs button,.builder label,.builder label span,.pbox-h b,
.pbox pre,.trytask,.tryex,.micro label{font-size:16px}
.builder label,.builder label span,.micro label{line-height:1.5}

/* Selector de vistas: navegación diferenciada de los títulos del contenido. */
.tabs{display:inline-flex;width:fit-content;max-width:100%;gap:4px;padding:4px;margin:22px 0 24px;border:0;border-radius:14px;background:var(--accent);vertical-align:top}
.tabs button{padding:10px 18px;min-height:44px;border:0;border-radius:10px;background:transparent;font-family:var(--f-body);font-size:19px;font-weight:500;line-height:1.3;color:var(--navy)}
.tabs button[aria-selected="true"]{background:var(--white);color:var(--navy);border:0}

/* Ruta de ambos días: nombres legibles también en celular. */
.route .tt{font-size:16px}
.side h2{font-size:19px}

/* Identidad del curso con presencia suficiente en la cabecera. */
.brand b{font-size:22px}
@media(max-width:600px){.brand b{font-size:18px}}

/* Tarjetas de inicio: misma medida de lectura y cortes naturales. */
.hero.navy.intro-hero .page-h,.hero.navy.intro-hero .lead{max-width:560px}
.intro-hero .page-h{text-wrap:balance}
.intro-hero .lead{text-wrap:balance}
.intro-hero .keep-phrase{white-space:nowrap}

/* Jerarquía visual: textos y actividades conservados. */
.stepcard{border-color:var(--line)}
.stepcard-h{background:var(--white);color:var(--navy);border-bottom:1px solid var(--line)}
.stepcard-h h3,.stepcard-h .stepnum{color:var(--navy)}
.stepcard-h small{color:var(--muted)}
.casetabs button[aria-current="true"]{background:var(--accent);border-color:var(--navy);color:var(--navy)}
.stepcard-ck,.stepcard-h.ckh,.stepcard-ck.numbered .ckb{background:var(--n07)}
.key,.key[class*="tone-"]{border:0;border-left:3px solid var(--navy);background:var(--clave);color:var(--navy);padding-left:14px}
.fundamentos-read>.p{max-width:70ch;text-wrap:pretty}
.blk-kick,.case .lab,.tl-lab,.eyebrow,.aplica-lab{text-transform:none;letter-spacing:normal}