/* Colores principales: --c y --c2 se definen en js/config.js según el nivel. */
:root {
  --c: #5b3fd1; --c2: #efeaff; --cosc: #3d2a96;
  --texto: #1f2330; --suave: #5d6475; --fondo: #f6f7fb; --blanco: #fff; --borde: #dde1ea;
  --ok: #1e8e4e; --okf: #e6f6ec; --no: #c0392b; --nof: #fdecea; --amarillo: #f2b705;
  color-scheme: light;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--fondo); color: var(--texto); font: 17px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif; }
a { color: var(--cosc); }
h1, h2, h3 { line-height: 1.2; margin: .2em 0 .5em; }
h2 { font-size: 1.45rem; } h3 { font-size: 1.15rem; margin-top: 1.4em; }

.cabecera { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 10px 16px; background: var(--c); color: #fff; position: sticky; top: 0; z-index: 5; }
.marca { display: flex; align-items: center; gap: 10px; color: #fff; text-decoration: none; }
.marca small { display: block; font-size: .8rem; opacity: .9; }
.logo { display: grid; place-items: center; width: 40px; height: 40px; border-radius: 12px; background: #fff; color: var(--c); font-weight: 800; font-size: 1.1rem; }
.chip { background: rgba(255, 255, 255, .18); padding: 4px 12px; border-radius: 999px; font-size: .9rem; white-space: nowrap; }

main { max-width: 860px; margin: 0 auto; padding: 16px; }
.pie { max-width: 860px; margin: 20px auto 30px; padding: 0 16px; color: var(--suave); font-size: .8rem; text-align: center; }
.cargando { text-align: center; color: var(--suave); }

.panel, .pregunta { background: var(--blanco); border: 1px solid var(--borde); border-radius: 18px; padding: 20px; box-shadow: 0 2px 8px rgba(20, 30, 60, .05); }
.centro { text-align: center; }
.grande { font-size: 1.6rem; font-weight: 800; color: var(--cosc); margin: .3em 0; }
.sub { color: var(--suave); font-size: .92rem; }
.fila { display: flex; gap: 10px; align-items: center; }
.wrap { flex-wrap: wrap; }
.acciones { justify-content: space-between; flex-wrap: wrap; margin-top: 18px; }
.oculto { visibility: hidden; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }

.btn { font: inherit; font-weight: 600; border: 2px solid var(--borde); background: #fff; color: var(--texto); padding: 10px 18px; border-radius: 12px; cursor: pointer; min-height: 46px; }
.btn:hover { border-color: var(--c); }
.btn:focus-visible, .alt:focus-visible, .tema:focus-visible, .opc:focus-visible, .tarjeta:focus-visible, input:focus-visible, select:focus-visible { outline: 3px solid var(--amarillo); outline-offset: 2px; }
.btn.primario { background: var(--c); border-color: var(--c); color: #fff; }
.btn.primario:hover { background: var(--cosc); }
.btn.primario:disabled { opacity: .45; cursor: not-allowed; }
.btn.suave { background: var(--c2); border-color: var(--c2); color: var(--cosc); }
.btn.link { border: none; background: none; color: var(--suave); text-decoration: underline; padding: 6px; min-height: auto; font-weight: 400; }
.btn.peligro { background: var(--no); border-color: var(--no); color: #fff; }

input, select { font: inherit; padding: 10px 14px; border: 2px solid var(--borde); border-radius: 12px; min-height: 46px; background: #fff; color: var(--texto); }
input { flex: 1; min-width: 0; }
input.bien { border-color: var(--ok); background: var(--okf); }
input.mal { border-color: var(--no); background: var(--nof); }
.campo { display: flex; flex-direction: column; gap: 4px; margin: 10px 0; font-weight: 600; max-width: 360px; }

/* Bienvenida e inicio */
.bienvenida { text-align: center; max-width: 520px; margin: 20px auto; }
.bienvenida form { margin: 16px 0; }
.bienvenida .wrap { justify-content: center; }
.logo-grande { display: inline-grid; place-items: center; width: 84px; height: 84px; border-radius: 24px; background: var(--c); color: #fff; font-size: 2.2rem; font-weight: 800; margin-bottom: 8px; }
.hola h1 { font-size: 1.7rem; margin-bottom: 0; }
.hola p { margin-top: 4px; color: var(--suave); }
.tarjetas { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 14px; margin: 16px 0; }
.tarjeta { font: inherit; text-align: left; display: flex; flex-direction: column; gap: 4px; padding: 18px; border-radius: 18px; border: 2px solid var(--borde); background: #fff; cursor: pointer; color: var(--texto); }
.tarjeta:hover { border-color: var(--c); transform: translateY(-2px); }
.tarjeta b { font-size: 1.1rem; color: var(--cosc); }
.tarjeta span:last-child { color: var(--suave); font-size: .92rem; }
.ico-t { font-size: 1.8rem; }
.info { background: #fff; border: 1px solid var(--borde); border-radius: 14px; padding: 12px 16px; }
.info summary { cursor: pointer; font-weight: 600; }
.aviso { background: #fff7db; border: 1px solid #f1d27a; border-radius: 14px; padding: 12px 16px; margin: 12px 0; display: flex; gap: 12px; align-items: center; flex-wrap: wrap; justify-content: space-between; }
.pie-inicio { text-align: center; }

/* Selección de tema y dificultad */
.temas { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 10px; }
.tema { font: inherit; display: flex; flex-direction: column; align-items: flex-start; gap: 2px; text-align: left; padding: 12px; border: 2px solid var(--borde); border-radius: 14px; background: #fff; cursor: pointer; color: var(--texto); }
.tema small { color: var(--suave); }
.tema.on, .opc.on { border-color: var(--c); background: var(--c2); }
.seg { gap: 8px; }
.opc { font: inherit; padding: 10px 16px; border: 2px solid var(--borde); border-radius: 12px; background: #fff; cursor: pointer; min-height: 46px; color: var(--texto); }

/* Pregunta */
.barra-sup { display: flex; justify-content: space-between; align-items: center; gap: 10px; flex-wrap: wrap; margin-bottom: 12px; font-weight: 600; }
.reloj { font-variant-numeric: tabular-nums; font-size: 1.3rem; background: #fff; border: 2px solid var(--borde); border-radius: 12px; padding: 4px 12px; }
.reloj.amarillo { border-color: var(--amarillo); background: #fff7db; }
.reloj.rojo { border-color: var(--no); background: var(--nof); color: var(--no); }
.tiempo { height: 10px; background: #e5e7ef; border-radius: 99px; overflow: hidden; margin-bottom: 12px; }
.tiempo div { height: 100%; width: 100%; background: var(--c); transition: width .2s linear; }
.meta { display: flex; gap: 14px; flex-wrap: wrap; color: var(--suave); font-size: .85rem; margin-bottom: 10px; }
.enunciado { font-size: 1.15rem; }
.figura { margin: 14px 0; overflow-x: auto; text-align: center; }
.figura svg, .fig { max-width: 100%; height: auto; }
.alts { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 16px; }
.alt { font: inherit; display: flex; align-items: center; gap: 12px; text-align: left; padding: 12px 14px; border: 2px solid var(--borde); border-radius: 14px; background: #fff; cursor: pointer; min-height: 56px; color: var(--texto); font-size: 1.08rem; }
.alt:hover:not(:disabled) { border-color: var(--c); }
.alt .letra { display: grid; place-items: center; min-width: 32px; height: 32px; border-radius: 50%; background: var(--c2); color: var(--cosc); font-weight: 800; }
.alt.sel { border-color: var(--c); background: var(--c2); }
.alt.sel .letra { background: var(--c); color: #fff; }
.alt.correcta { border-color: var(--ok); background: var(--okf); }
.alt.incorrecta { border-color: var(--no); background: var(--nof); }
.alt:disabled { cursor: default; color: var(--texto); }
.abierta { margin-top: 16px; }
.unidad { font-weight: 700; }
.ayuda { color: var(--suave); font-size: .85rem; margin: 6px 0 0; }
.feedback { margin-top: 16px; border-radius: 14px; padding: 12px 16px; }
.feedback.ok { background: var(--okf); border: 1px solid #a7dcb9; }
.feedback.no { background: var(--nof); border: 1px solid #f1b4ad; }
.titulo-fb { font-weight: 800; margin: 0 0 6px; font-size: 1.1rem; }
.sol { margin-bottom: 0; }
.pista { margin-top: 14px; background: #fff7db; border: 1px solid #f1d27a; border-radius: 14px; padding: 10px 14px; }
.racha, .pts { font-weight: 800; color: var(--cosc); text-align: center; font-size: 1.1rem; }

/* Fracciones apiladas */
.fr { display: inline-flex; flex-direction: column; align-items: center; vertical-align: middle; line-height: 1.05; margin: 0 2px; font-size: .95em; }
.fr-n { border-bottom: 2px solid currentColor; padding: 0 3px; }
.fr-d { padding: 0 3px; }
.mix { margin-right: 2px; }

/* Tablas */
.tbl { border-collapse: collapse; margin: 12px auto; background: #fff; }
.tbl th, .tbl td { border: 1px solid var(--borde); padding: 6px 12px; text-align: center; }
.tbl th { background: var(--c2); color: var(--cosc); }
.tbl caption { font-weight: 700; margin-bottom: 6px; }
.tbl.ancho { width: 100%; }
.tbl.ancho td:first-child { text-align: left; }
.picto td { text-align: left; font-size: 1.4rem; letter-spacing: 2px; }
.ico.medio { display: inline-block; width: .55em; overflow: hidden; vertical-align: bottom; }
.tallo td:last-child { text-align: left; letter-spacing: 6px; }
.nota { text-align: center; color: var(--suave); font-size: .85rem; margin: 0; }
.barra-celda { width: 30%; }
.bar { height: 12px; background: #e5e7ef; border-radius: 99px; overflow: hidden; }
.bar div { height: 100%; background: var(--c); }
.consejo { background: var(--c2); border-radius: 12px; padding: 10px 14px; }

/* Simulacro */
.navq { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 12px; }
.nq { font: inherit; width: 40px; height: 40px; border-radius: 10px; border: 2px solid var(--borde); background: #fff; cursor: pointer; font-size: .9rem; color: var(--texto); }
.nq.resp { background: var(--c2); border-color: var(--c2); color: var(--cosc); font-weight: 700; }
.nq.marca { border-color: var(--amarillo); box-shadow: inset 0 -4px 0 var(--amarillo); }
.nq.actual { border-color: var(--c); outline: 2px solid var(--c); }
.revision { display: flex; flex-direction: column; gap: 8px; margin-top: 10px; text-align: left; }
.rev { border: 1px solid var(--borde); border-radius: 12px; padding: 8px 12px; background: #fff; }
.rev summary { cursor: pointer; display: flex; justify-content: space-between; gap: 10px; font-weight: 600; }
.rev.ok { border-left: 5px solid var(--ok); }
.rev.no { border-left: 5px solid var(--no); }
.modal { position: fixed; inset: 0; background: rgba(10, 15, 30, .45); display: grid; place-items: center; padding: 16px; z-index: 20; }
.modal .caja { background: #fff; border-radius: 18px; padding: 22px; max-width: 440px; width: 100%; }

/* Hoja para imprimir */
.hoja { background: #fff; padding: 20px; border-radius: 12px; border: 1px solid var(--borde); margin-top: 12px; }
.hoja h2 { font-size: 1.15rem; }
.datos-hoja { color: var(--suave); }
.item { padding: 10px 0; border-bottom: 1px dashed var(--borde); break-inside: avoid; }
.item .enunciado { font-size: 1rem; }
.alts-print { display: flex; flex-wrap: wrap; gap: 6px 26px; margin: 6px 0 0 20px; }
.linea-resp { margin: 8px 0 0 20px; color: var(--suave); }
.sol-item { margin: 6px 0; font-size: .92rem; }

@media (max-width: 560px) {
  body { font-size: 16px; }
  .alts { grid-template-columns: 1fr; }
  .panel, .pregunta { padding: 16px; border-radius: 14px; }
  .marca small { display: none; }
  .barra-celda { width: 25%; }
  .tbl th, .tbl td { padding: 5px 6px; }
}
@media print {
  .cabecera, .pie, .no-imprimir { display: none !important; }
  body { background: #fff; font-size: 12pt; }
  main { max-width: none; padding: 0; }
  .hoja { border: none; padding: 0; }
  .salto { break-before: page; }
}