:root {
  --navy: #013e62; --navy-2: #0b5a87; --amarillo: #f7af09; --amarillo-claro: #fff1c7;
  --coral: #ef5a3c; --coral-claro: #fde3dc; --crema: #fcf7e7; --blanco: #fff; --texto: #1d2b36;
  --gris: #6b7a86; --verde: #2a9d8f; --verde-claro: #d8f1ec; --rojo: #d64545; --rojo-claro: #fbe1e1;
  --radio: 18px; --sombra: 0 4px 0 rgba(1, 62, 98, .12), 0 10px 30px rgba(1, 62, 98, .08);
}
* { box-sizing: border-box; }
html, body { margin: 0; }
body { min-height: 100vh; font-family: 'Nunito', system-ui, sans-serif; background: var(--crema); color: var(--texto); font-size: 17px; line-height: 1.45; -webkit-tap-highlight-color: transparent; }
h1, h2, h3 { color: var(--navy); font-weight: 900; line-height: 1.15; margin: .2em 0 .4em; }
h1 { font-size: 1.8rem; } h2 { font-size: 1.5rem; } h3 { font-size: 1.15rem; }
a { color: var(--navy-2); }
small { color: var(--gris); font-weight: 600; }
code, .mono { font-family: ui-monospace, Menlo, monospace; }

/* Barra */
.barra { position: sticky; top: 0; z-index: 10; display: flex; align-items: center; justify-content: space-between; gap: 10px; padding: 10px 18px; background: var(--navy); color: #fff; flex-wrap: wrap; }
.marca { display: flex; align-items: center; gap: 10px; color: #fff; text-decoration: none; font-weight: 900; font-size: 1.3rem; }
.marca img { width: 38px; height: 38px; border-radius: 10px; }
.barra nav { display: flex; gap: 4px; flex-wrap: wrap; align-items: center; }
.barra nav a, .barra nav .link { color: #fff; text-decoration: none; font-weight: 700; padding: 6px 10px; border-radius: 10px; font-size: .95rem; }
.barra nav a:hover, .barra nav .link:hover { background: rgba(255, 255, 255, .14); }
.aviso-demo { background: var(--amarillo-claro); color: var(--navy); text-align: center; font-size: .85rem; padding: 6px; font-weight: 700; }
.contenido { max-width: 1040px; margin: 0 auto; padding: 22px 16px 60px; }

/* Botones */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; border: 0; cursor: pointer; font: inherit; font-weight: 800; background: var(--navy); color: #fff; padding: 12px 22px; border-radius: 14px; box-shadow: 0 4px 0 #00263d; text-decoration: none; transition: transform .08s; }
.btn:active { transform: translateY(3px); box-shadow: 0 1px 0 #00263d; }
.btn:disabled { opacity: .55; }
.btn.sec { background: #fff; color: var(--navy); box-shadow: 0 4px 0 #c9d6de; border: 2px solid #c9d6de; }
.btn.grande { width: 100%; padding: 15px; font-size: 1.08rem; margin-top: 10px; }
.btn.google { background: #fff; color: var(--texto); border: 2px solid #dadce0; box-shadow: 0 4px 0 #dadce0; }
.btn.chispa { background: var(--amarillo); color: var(--navy); box-shadow: 0 4px 0 #c78a00; }
.btn.chico { padding: 8px 14px; font-size: .9rem; margin-left: auto; }
.link { background: none; border: 0; padding: 0; font: inherit; font-weight: 700; color: var(--navy-2); cursor: pointer; text-decoration: underline; }
.link.peligro { color: var(--rojo); }
.volver { display: inline-block; margin-bottom: 10px; font-weight: 800; text-decoration: none; }

/* Tarjetas y formularios */
.tarjeta { background: #fff; border-radius: var(--radio); box-shadow: var(--sombra); padding: 22px; margin-bottom: 18px; }
.centro { min-height: 100vh; display: grid; place-items: center; padding: 20px; }
.centro .tarjeta { width: 100%; max-width: 430px; text-align: center; }
.logo-grande { width: 240px; max-width: 70%; border-radius: 30px; }
.logo-chico { width: 84px; border-radius: 20px; }
.lema { font-size: 1.1rem; color: var(--navy); }
.nota { color: var(--gris); font-size: .88rem; margin-top: 10px; }
.centrado { text-align: center; }
label { display: block; text-align: left; font-weight: 800; color: var(--navy); margin: 12px 0; }
input, select { width: 100%; font: inherit; font-size: 1.05rem; padding: 12px 14px; border: 2.5px solid #c9d6de; border-radius: 12px; margin-top: 6px; background: #fff; color: var(--texto); }
input:focus, select:focus { outline: none; border-color: var(--navy-2); box-shadow: 0 0 0 4px rgba(11, 90, 135, .15); }
input.codigo { text-transform: uppercase; letter-spacing: .2em; text-align: center; font-weight: 900; }
.error { color: var(--rojo); font-weight: 700; min-height: 1em; }

/* Inicio */
.saludo { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; margin-bottom: 8px; }
.saludo p { margin: 0; color: var(--gris); font-weight: 700; }
.pestanas { display: flex; gap: 8px; margin: 14px 0 18px; flex-wrap: wrap; align-items: center; }
.pestana { border: 2.5px solid #c9d6de; background: #fff; color: var(--navy); font: inherit; font-weight: 900; padding: 10px 18px; border-radius: 999px; cursor: pointer; }
.pestana.activa.mate { background: var(--navy); border-color: var(--navy); color: #fff; }
.pestana.activa.esp { background: var(--coral); border-color: var(--coral); color: #fff; }
.rejilla { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 16px; }
.rejilla.dos { grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); }
.tema { position: relative; display: block; background: #fff; border-radius: var(--radio); padding: 18px; text-decoration: none; color: var(--texto); box-shadow: var(--sombra); border-top: 7px solid var(--navy); transition: transform .12s; }
.tema.esp { border-top-color: var(--coral); }
.tema.grupo { border-top-color: var(--amarillo); }
.tema:hover { transform: translateY(-3px); }
.tema h3 { margin: 6px 0; }
.tema p { margin: 0 0 6px; font-size: .92rem; color: var(--gris); }
.ico { font-size: 2rem; }
.ico.grande { font-size: 3rem; }
.estrellas { margin-top: 8px; }
.estrella { color: #e1dccb; font-size: 1.4rem; }
.estrella.si { color: var(--amarillo); text-shadow: 0 1px 0 #c78a00; }
.record { color: var(--navy) !important; font-weight: 800; }

/* Nivel */
.tema-det { text-align: center; max-width: 640px; margin: 0 auto; border-top: 8px solid var(--navy); }
.tema-det.esp { border-top-color: var(--coral); }
.niveles { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.nivel { font: inherit; border: 0; cursor: pointer; border-radius: 16px; padding: 16px 8px; display: flex; flex-direction: column; gap: 4px; align-items: center; color: var(--navy); }
.nivel b { font-size: 1.15rem; } .nivel span { font-size: .85rem; font-weight: 700; }
.nivel.n1 { background: var(--verde-claro); box-shadow: 0 4px 0 #9fd8cd; }
.nivel.n2 { background: var(--amarillo-claro); box-shadow: 0 4px 0 #f0d58a; }
.nivel.n3 { background: var(--coral-claro); box-shadow: 0 4px 0 #f3b3a3; }
.nivel:active { transform: translateY(3px); }

/* Actividad */
.act-cabeza { display: flex; align-items: center; gap: 12px; max-width: 760px; margin: 0 auto 14px; }
.act-cabeza .link { text-decoration: none; font-size: 1.4rem; color: var(--gris); }
.progreso { flex: 1; height: 16px; background: #e8e2cf; border-radius: 999px; overflow: hidden; }
.progreso div { height: 100%; background: var(--amarillo); border-radius: 999px; transition: width .3s; }
.cuenta { font-weight: 900; color: var(--navy); }
.pregunta, .resultado { max-width: 760px; margin: 0 auto; }
.etiqueta { font-weight: 800; color: var(--gris); font-size: .9rem; margin-top: 0; }
.enunciado { font-size: 1.3rem; font-weight: 700; margin: 10px 0 18px; line-height: 1.5; }
.enunciado .num, .num { font-size: 1.15em; color: var(--navy); letter-spacing: .02em; }
.letras { color: var(--navy); }
.oracion { display: inline-block; background: var(--crema); padding: 6px 12px; border-radius: 10px; margin-bottom: 6px; }
.hueco { display: inline-block; min-width: 2ch; border-bottom: 3px solid var(--coral); color: var(--coral); }
u.marca { text-decoration-color: var(--coral); text-decoration-thickness: 4px; text-underline-offset: 5px; color: var(--coral); }
.tonica { color: var(--coral); }
.frac { display: inline-flex; flex-direction: column; align-items: center; vertical-align: middle; font-weight: 800; line-height: 1.05; margin: 0 3px; }
.frac span:first-child { border-bottom: 2.5px solid currentColor; padding: 0 4px; }
.frac span:last-child { padding: 0 4px; }
.visual { display: block; max-width: 100%; max-height: 280px; margin: 6px auto 4px; }
.visual .et { font: 700 16px Nunito, sans-serif; fill: var(--navy); }
.visual .et.chica { font-size: 13px; }
.visual .et.coral { fill: var(--coral); }
.lectura { background: var(--crema); border-left: 6px solid var(--coral); padding: 14px 18px; border-radius: 12px; margin-bottom: 12px; max-height: 340px; overflow: auto; }
.lectura h4 { margin: 0 0 6px; color: var(--navy); }
.lectura p { margin: 0; font-size: 1.02rem; }
.opciones { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.opciones.tres { grid-template-columns: repeat(3, 1fr); }
.opcion { font: inherit; font-weight: 800; font-size: 1.08rem; background: #fff; color: var(--texto); border: 3px solid #c9d6de; border-radius: 14px; padding: 14px 12px; cursor: pointer; box-shadow: 0 4px 0 #c9d6de; min-height: 60px; }
.opcion:hover:not(:disabled) { border-color: var(--navy-2); }
.opcion:active:not(:disabled) { transform: translateY(3px); box-shadow: 0 1px 0 #c9d6de; }
.opcion.bien, input.bien { background: var(--verde-claro); border-color: var(--verde); }
.opcion.mal, input.mal { background: var(--rojo-claro); border-color: var(--rojo); }
.opcion:disabled { cursor: default; color: var(--texto); }
.resp { display: flex; gap: 10px; flex-wrap: wrap; }
.resp input { flex: 1 1 200px; margin: 0; font-size: 1.3rem; font-weight: 800; }
.retro { margin-top: 18px; padding: 14px 18px; border-radius: 14px; animation: sube .25s ease; }
.retro.bien { background: var(--verde-claro); border: 2px solid var(--verde); }
.retro.mal { background: var(--rojo-claro); border: 2px solid var(--rojo); }
.retro b { font-size: 1.1rem; color: var(--navy); }
.retro p { margin: 6px 0 10px; }
.sacude { animation: sacude .35s; }
@keyframes sacude { 25% { transform: translateX(-6px); } 75% { transform: translateX(6px); } }
@keyframes sube { from { opacity: 0; transform: translateY(8px); } }

/* Resultado */
.resultado { text-align: center; }
.cal { display: inline-grid; place-items: center; width: 120px; height: 120px; border-radius: 50%; font-size: 2.6rem; font-weight: 900; margin: 6px auto; color: #fff; }
.cal.alto { background: var(--verde); } .cal.medio { background: var(--navy-2); } .cal.bajo { background: var(--amarillo); color: var(--navy); } .cal.rojo { background: var(--coral); }
.comprobante { margin: 16px auto; padding: 14px; background: var(--amarillo-claro); border: 2px dashed var(--amarillo); border-radius: 14px; max-width: 360px; display: flex; flex-direction: column; gap: 6px; align-items: center; }
.comprobante span { font-weight: 800; color: var(--navy); font-size: .9rem; }
.comprobante b { font-size: 2rem; letter-spacing: .15em; font-family: ui-monospace, Menlo, monospace; color: var(--navy); user-select: all; }
.acciones { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; margin-top: 12px; }
.repaso { text-align: left; margin-top: 18px; }
.repaso summary { font-weight: 800; cursor: pointer; color: var(--navy); }
.err-item { border-top: 1px solid #eee; padding: 10px 0; }
.err-item p { margin: 4px 0; }
.confeti { position: fixed; inset: 0; pointer-events: none; overflow: hidden; z-index: 50; }
.confeti i { position: absolute; top: -12px; width: 10px; height: 14px; border-radius: 2px; animation: cae 2.2s ease-in forwards; }
@keyframes cae { to { transform: translateY(105vh) rotate(720deg); } }

/* Reto */
.reto { max-width: 520px; margin: 0 auto; text-align: center; }
.reto-cabeza { display: flex; justify-content: space-between; font-size: 1.3rem; font-weight: 800; color: var(--navy); }
.reto-q { font-size: 3rem; font-weight: 900; color: var(--navy); margin: 26px 0; }
.reto-q.bien { animation: pulsoV .4s; } .reto-q.mal { animation: pulsoR .4s; }
@keyframes pulsoV { 50% { color: var(--verde); transform: scale(1.1); } }
@keyframes pulsoR { 50% { color: var(--rojo); transform: translateX(6px); } }
.reto-inp { font-size: 2rem; text-align: center; font-weight: 900; max-width: 220px; }

/* Docente */
.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-bottom: 18px; }
.stats div { background: #fff; border-radius: var(--radio); box-shadow: var(--sombra); padding: 16px; text-align: center; }
.stats b { display: block; font-size: 1.8rem; color: var(--navy); font-weight: 900; }
.stats span { color: var(--gris); font-weight: 700; font-size: .9rem; }
.dos-col { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 20px; }
.codigo-grupo b, .codigo-grande b { font-family: ui-monospace, Menlo, monospace; letter-spacing: .12em; color: var(--navy); }
.grupo-cabeza { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; }
.grupo-cabeza p { margin: 0; color: var(--gris); font-weight: 700; }
.codigo-grande { background: var(--amarillo-claro); border: 2px dashed var(--amarillo); border-radius: 14px; padding: 10px 18px; text-align: center; font-weight: 800; color: var(--navy); font-size: .85rem; }
.codigo-grande b { display: block; font-size: 1.8rem; }
.scroll { overflow-x: auto; }
.tabla { width: 100%; border-collapse: collapse; font-size: .92rem; }
.tabla th { text-align: left; color: var(--navy); font-weight: 900; padding: 8px 6px; border-bottom: 2.5px solid #e8e2cf; vertical-align: bottom; }
.tabla td { padding: 7px 6px; border-bottom: 1px solid #f0ebdc; }
.matriz th, .matriz td { text-align: center; }
.matriz th:first-child, .matriz td.nombre { text-align: left; white-space: nowrap; }
.matriz th small { display: block; font-size: .7rem; max-width: 80px; margin: 0 auto; }
.matriz td.nombre .link { text-decoration: none; color: var(--texto); }
.vacia { color: #ccc; }
.pill { display: inline-block; min-width: 42px; padding: 3px 8px; border-radius: 999px; font-weight: 900; text-align: center; }
.pill small { margin-left: 3px; font-size: .7rem; color: inherit; opacity: .8; }
.pill.alto { background: var(--verde-claro); color: #13685e; } .pill.medio { background: #dceaf3; color: var(--navy); }
.pill.bajo { background: var(--amarillo-claro); color: #8a5d00; } .pill.rojo { background: var(--rojo-claro); color: var(--rojo); }
.buscar { margin-bottom: 14px; }
.toast { position: fixed; left: 50%; bottom: 24px; transform: translate(-50%, 30px); opacity: 0; background: var(--navy); color: #fff; padding: 12px 20px; border-radius: 14px; font-weight: 800; transition: .25s; z-index: 60; max-width: 90vw; text-align: center; }
.toast.ver { opacity: 1; transform: translate(-50%, 0); }
.toast.ok { background: var(--verde); } .toast.mal { background: var(--rojo); }
.cargando { min-height: 100vh; display: grid; place-items: center; font-weight: 800; color: var(--navy); }

@media (max-width: 640px) {
  body { font-size: 16px; }
  h1 { font-size: 1.5rem; }
  .opciones { grid-template-columns: 1fr; }
  .opciones.dos, .opciones.tres { grid-template-columns: 1fr 1fr; }
  .opciones.tres .opcion:last-child { grid-column: span 2; }
  .niveles, .dos-col { grid-template-columns: 1fr; }
  .enunciado { font-size: 1.15rem; }
  .tarjeta { padding: 16px; }
  .barra { padding: 8px 12px; }
  .barra nav a, .barra nav .link { padding: 5px 7px; font-size: .88rem; }
}