/* =====================================================================
   ESTILOS · Curso Baterías LiFePO4 y 18650
   Paleta: azul oscuro (base), verde (acción/éxito), blanco (lectura),
   amarillo (acentos y energía).
   ===================================================================== */
:root {
  --navy-950: #061224;
  --navy-900: #0B1F3A;
  --navy-800: #102A4C;
  --navy-700: #17365F;
  --navy-600: #214A7D;
  --verde: #22C55E;
  --verde-o: #15803D;
  --verde-s: #DCFCE7;
  --amarillo: #FACC15;
  --amarillo-s: #FEF9C3;
  --rojo: #DC2626;
  --rojo-s: #FEE2E2;
  --azul-s: #E0ECFF;
  --blanco: #FFFFFF;
  --papel: #F6F8FB;
  --linea: #E2E8F0;
  --texto: #0F1D33;
  --texto-2: #475569;
  --en-oscuro: #E6EEF8;
  --en-oscuro-2: #9FB3CC;
  --radio: 16px;
  --radio-s: 10px;
  --sombra: 0 1px 2px rgba(6,18,36,.08), 0 8px 24px rgba(6,18,36,.10);
  --fuente: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --ancho: 760px;
  --nav-h: 76px;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--fuente);
  font-size: 17px;
  line-height: 1.55;
  color: var(--en-oscuro);
  background: radial-gradient(1200px 600px at 85% -10%, #17365F 0%, transparent 60%), var(--navy-900);
  background-attachment: fixed;
  min-height: 100vh;
}
img, svg { max-width: 100%; }
a { color: inherit; }
h1, h2, h3 { line-height: 1.2; margin: 0 0 .5em; text-wrap: balance; }
p { margin: 0 0 .8em; }
button { font: inherit; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.saltar { position: absolute; left: -999px; top: 8px; background: var(--amarillo); color: var(--navy-900); padding: 8px 14px; border-radius: 8px; z-index: 100; font-weight: 700; }
.saltar:focus { left: 8px; }
:focus-visible { outline: 3px solid var(--amarillo); outline-offset: 2px; border-radius: 6px; }
h1[tabindex="-1"]:focus, h1[tabindex="-1"]:focus-visible { outline: none; }
main { outline: none; }

/* ---------------- Barra superior ---------------- */
.topbar {
  position: sticky; top: 0; z-index: 30;
  display: flex; align-items: center; gap: 12px;
  padding: 10px max(16px, env(safe-area-inset-left));
  padding-top: max(10px, env(safe-area-inset-top));
  background: rgba(11,31,58,.92);
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255,255,255,.08);
}
.marca { display: flex; align-items: center; gap: 10px; text-decoration: none; font-weight: 600; color: var(--blanco); white-space: nowrap; }
.marca img { width: 32px; height: 32px; }
.marca b { color: var(--verde); }
.topnav { display: flex; gap: 4px; margin-left: auto; }
.topnav a { text-decoration: none; padding: 8px 12px; border-radius: 999px; color: var(--en-oscuro-2); font-weight: 600; font-size: 15px; }
.topnav a:hover { color: var(--blanco); background: rgba(255,255,255,.06); }
.topnav a[aria-current="page"] { color: var(--navy-900); background: var(--verde); }
.pts { display: flex; align-items: center; gap: 6px; text-decoration: none; padding: 6px 12px; border-radius: 999px; background: rgba(250,204,21,.14); color: var(--amarillo); font-weight: 700; font-variant-numeric: tabular-nums; }
.pts svg { width: 18px; height: 18px; }

main { max-width: var(--ancho); margin: 0 auto; padding: 20px 16px 120px; }

/* ---------------- Botones ---------------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 48px; padding: 10px 20px; border-radius: 999px; border: 2px solid transparent;
  font-weight: 700; font-size: 16px; text-decoration: none; cursor: pointer;
  transition: transform .12s ease, background-color .15s ease, opacity .15s ease;
}
.btn svg { width: 20px; height: 20px; flex: none; }
.btn:active { transform: translateY(1px); }
.btn-primario { background: var(--verde); color: var(--navy-950); }
.btn-primario:hover { background: #2fd56a; }
.btn-primario:disabled, .btn.deshabilitado { background: #3B4F6B; color: #9FB3CC; cursor: not-allowed; }
.btn-secundario { background: transparent; color: var(--blanco); border-color: rgba(255,255,255,.28); }
.btn-secundario:hover { background: rgba(255,255,255,.07); }
.btn-texto { background: none; color: var(--navy-600); text-decoration: underline; text-underline-offset: 3px; padding-inline: 8px; }
.btn-peligro { background: var(--rojo); color: #fff; }
.btn-grande { min-height: 54px; font-size: 17px; padding-inline: 24px; }

/* ---------------- Bienvenida ---------------- */
.hero { display: grid; grid-template-columns: 1.35fr 1fr; gap: 24px; align-items: center; padding: 28px 0 12px; }
.sobretitulo { text-transform: uppercase; letter-spacing: .08em; font-size: 13px; font-weight: 700; color: var(--verde); margin-bottom: 8px; }
.hero h1 { font-size: clamp(32px, 6vw, 46px); color: var(--blanco); letter-spacing: -.01em; }
.resalte { color: var(--verde); }
.resalte-am { color: var(--amarillo); }
.hero-sub { color: var(--en-oscuro-2); font-size: 18px; max-width: 34em; }
.hero-acciones { display: flex; flex-wrap: wrap; gap: 12px; margin: 22px 0 8px; }
.hero-prog { margin-top: 16px; max-width: 380px; color: var(--en-oscuro-2); font-size: 14px; }
.hero-arte svg { width: 100%; height: auto; display: block; }

.cifras { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; margin: 28px 0; }
.cifra { background: var(--navy-800); border: 1px solid rgba(255,255,255,.07); border-radius: var(--radio); padding: 14px; display: flex; flex-direction: column; gap: 2px; }
.cifra-ic { color: var(--amarillo); }
.cifra-ic svg { width: 22px; height: 22px; }
.cifra strong { font-size: 22px; color: var(--blanco); font-variant-numeric: tabular-nums; }
.cifra span:last-child { color: var(--en-oscuro-2); font-size: 14px; }

.bloque-info h2 { color: var(--blanco); font-size: 22px; }
.pasos-info { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.paso-info { background: var(--navy-800); border-radius: var(--radio); padding: 18px; border: 1px solid rgba(255,255,255,.07); }
.paso-info h3 { font-size: 17px; color: var(--blanco); margin-top: 10px; }
.paso-info p { color: var(--en-oscuro-2); font-size: 15px; margin: 0; }
.paso-n { display: inline-grid; place-items: center; width: 32px; height: 32px; border-radius: 50%; background: var(--verde); color: var(--navy-950); font-weight: 800; }

.aviso-seguridad { display: flex; gap: 14px; margin: 28px 0; padding: 18px; border-radius: var(--radio); background: rgba(250,204,21,.08); border: 1px solid rgba(250,204,21,.35); }
.aviso-seguridad > svg { width: 30px; height: 30px; color: var(--amarillo); flex: none; }
.aviso-seguridad h2 { font-size: 18px; color: var(--amarillo); }
.aviso-seguridad p { margin: 0; color: var(--en-oscuro); font-size: 15px; }
.pie { text-align: center; color: var(--en-oscuro-2); font-size: 13px; padding: 16px 0; }

/* ---------------- Cabeceras de sección ---------------- */
.cabecera { padding: 16px 0 8px; }
.cabecera h1 { color: var(--blanco); font-size: clamp(26px, 5vw, 34px); }
.cabecera > p { color: var(--en-oscuro-2); }
.volver { display: inline-flex; align-items: center; gap: 4px; color: var(--en-oscuro-2); text-decoration: none; font-weight: 600; font-size: 15px; margin-bottom: 10px; min-height: 36px; }
.volver svg { width: 18px; height: 18px; }
.volver:hover { color: var(--blanco); }
.mod-prog { max-width: 420px; color: var(--en-oscuro-2); font-size: 14px; margin-top: 8px; }

/* ---------------- Barras de progreso ---------------- */
.barra { height: 8px; border-radius: 999px; background: var(--linea); overflow: hidden; margin-top: 6px; }
.barra i { display: block; height: 100%; background: var(--verde); border-radius: inherit; transition: width .4s ease; }
.barra-clara { background: rgba(255,255,255,.12); }
.barra-am i { background: linear-gradient(90deg, var(--verde), var(--amarillo)); }

/* ---------------- Módulos ---------------- */
.lista-modulos { display: grid; gap: 12px; }
.modulo { display: flex; gap: 16px; padding: 18px; border-radius: var(--radio); background: var(--blanco); color: var(--texto); text-decoration: none; box-shadow: var(--sombra); transition: transform .12s ease; }
a.modulo:hover { transform: translateY(-2px); }
.modulo h2 { font-size: 19px; margin: 6px 0 4px; }
.modulo p { color: var(--texto-2); font-size: 15px; margin-bottom: 8px; }
.mod-num { flex: none; width: 48px; height: 48px; border-radius: 14px; display: grid; place-items: center; font-size: 22px; font-weight: 800; background: var(--navy-900); color: var(--amarillo); }
.mod-cuerpo { flex: 1; min-width: 0; }
.mod-meta { display: flex; gap: 16px; color: var(--texto-2); font-size: 14px; }
.mod-meta span { display: inline-flex; align-items: center; gap: 4px; }
.mod-meta svg { width: 16px; height: 16px; }
.modulo-bloq { background: var(--navy-800); color: var(--en-oscuro); box-shadow: none; border: 1px dashed rgba(255,255,255,.15); }
.modulo-bloq p, .modulo-bloq .mod-meta { color: var(--en-oscuro-2); }
.modulo-bloq .mod-num { background: var(--navy-700); color: var(--en-oscuro-2); }

.estado { display: inline-flex; align-items: center; gap: 4px; font-size: 12px; font-weight: 700; text-transform: uppercase; letter-spacing: .05em; padding: 3px 10px; border-radius: 999px; }
.estado svg { width: 14px; height: 14px; }
.estado-ok { background: var(--verde-s); color: var(--verde-o); }
.estado-curso { background: var(--amarillo-s); color: #854D0E; }
.estado-nuevo { background: var(--azul-s); color: var(--navy-600); }
.estado-pronto { background: rgba(255,255,255,.08); color: var(--en-oscuro-2); }
.tarjeta .estado-pronto { background: var(--papel); color: var(--texto-2); }

.lista-lecciones { list-style: none; padding: 0; margin: 16px 0; display: grid; gap: 8px; }
.leccion-item { display: flex; align-items: center; gap: 14px; padding: 14px 16px; border-radius: 14px; background: var(--blanco); color: var(--texto); text-decoration: none; box-shadow: var(--sombra); min-height: 64px; }
.leccion-item:hover { background: #F8FBFF; }
.li-num { flex: none; width: 40px; height: 40px; border-radius: 50%; display: grid; place-items: center; font-weight: 800; font-size: 14px; background: var(--papel); color: var(--navy-600); border: 2px solid var(--linea); }
.li-num svg { width: 20px; height: 20px; }
.leccion-item.hecha .li-num { background: var(--verde); color: var(--navy-950); border-color: var(--verde); }
.leccion-item.siguiente { outline: 3px solid var(--amarillo); }
.li-txt { flex: 1; min-width: 0; display: flex; flex-direction: column; }
.li-txt small { color: var(--texto-2); font-size: 14px; }
.li-ir { display: inline-flex; align-items: center; gap: 2px; color: var(--navy-600); font-weight: 700; font-size: 14px; white-space: nowrap; }
.li-ir svg { width: 20px; height: 20px; }

.tarjeta { background: var(--blanco); color: var(--texto); border-radius: var(--radio); padding: 20px; box-shadow: var(--sombra); margin-bottom: 14px; }
.tarjeta h2 { font-size: 20px; }
.plan { padding-left: 1.3em; color: var(--texto-2); }
.alerta { background: var(--rojo-s); color: #7F1D1D; padding: 10px 14px; border-radius: var(--radio-s); }

.felicitacion { display: flex; gap: 14px; align-items: flex-start; padding: 18px; border-radius: var(--radio); background: linear-gradient(135deg, var(--verde-o), #0F766E); color: #fff; margin: 14px 0; }
.felicitacion > svg { width: 36px; height: 36px; color: var(--amarillo); flex: none; }
.felicitacion h2 { font-size: 19px; color: #fff; }
.felicitacion p { margin: 0; }

/* ---------------- Lección ---------------- */
.lec-top { display: flex; justify-content: space-between; align-items: center; gap: 8px; }
.lec-top .volver { margin: 0; }
.lec-cont { color: var(--en-oscuro-2); font-size: 14px; font-weight: 600; }
.lec-titulo { color: var(--blanco); font-size: clamp(22px, 4.6vw, 28px); margin: 6px 0 12px; }
.puntos { display: flex; gap: 6px; margin-bottom: 16px; }
.punto { flex: 1; height: 6px; border-radius: 999px; background: rgba(255,255,255,.14); position: relative; }
a.punto::after { content: ""; position: absolute; inset: -10px 0; }
.punto.visto { background: var(--verde); opacity: .6; }
.punto.actual { background: var(--amarillo); opacity: 1; }

.pantalla { background: var(--blanco); color: var(--texto); border-radius: 20px; padding: 22px; box-shadow: var(--sombra); animation: entrar .25s ease; }
@keyframes entrar { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }
@media (prefers-reduced-motion: reduce) { .pantalla { animation: none; } * { transition: none !important; } }
.pantalla h2 { font-size: clamp(21px, 4.4vw, 26px); color: var(--navy-900); }
.pantalla > p { font-size: 17.5px; }
.p-cab { display: flex; justify-content: space-between; align-items: center; gap: 10px; margin-bottom: 14px; flex-wrap: wrap; }
.etiqueta { display: inline-flex; align-items: center; gap: 6px; font-size: 13px; font-weight: 800; text-transform: uppercase; letter-spacing: .06em; padding: 5px 12px 5px 8px; border-radius: 999px; }
.etiqueta svg { width: 16px; height: 16px; }
.et-gancho { background: var(--amarillo-s); color: #854D0E; }
.et-explicacion { background: var(--azul-s); color: var(--navy-600); }
.et-visual { background: #EDE9FE; color: #5B21B6; }
.et-ejemplo { background: #CFFAFE; color: #155E75; }
.et-actividad { background: var(--verde-s); color: var(--verde-o); }
.et-seguridad { background: var(--rojo-s); color: #991B1B; }
.et-cierre { background: var(--verde); color: var(--navy-950); }

.btn-audio { display: inline-flex; align-items: center; gap: 6px; min-height: 44px; padding: 8px 16px; border-radius: 999px; border: 2px solid var(--navy-900); background: var(--blanco); color: var(--navy-900); font-weight: 700; font-size: 15px; cursor: pointer; }
.btn-audio svg { width: 20px; height: 20px; }
.btn-audio:hover { background: var(--papel); }
.btn-audio.sonando { background: var(--navy-900); color: var(--amarillo); }

.tarjetas { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 10px; margin: 6px 0 14px; }
.tarjeta-mini { background: var(--papel); border: 1px solid var(--linea); border-left: 4px solid var(--verde); border-radius: 12px; padding: 14px; }
.tarjeta-mini h3 { font-size: 16.5px; color: var(--navy-900); margin-bottom: 4px; }
.tarjeta-mini p { margin: 0; font-size: 15.5px; color: #24344D; }

.lista { padding-left: 1.2em; margin: 6px 0 14px; }
.lista li { margin-bottom: 6px; }
.lista-check { list-style: none; padding: 0; }
.lista-check li { position: relative; padding-left: 30px; }
.lista-check li::before { content: ""; position: absolute; left: 0; top: 3px; width: 20px; height: 20px; border-radius: 50%; background: var(--verde-s) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M6 12.5l4 4L18 8' fill='none' stroke='%2315803D' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center/14px no-repeat; }

.figura { margin: 8px 0 16px; padding: 14px; background: #F8FAFC; border: 1px solid var(--linea); border-radius: 14px; text-align: center; }
.figura .vis, .figura img { width: 100%; max-width: 480px; height: auto; display: block; margin: 0 auto; }
.figura figcaption { font-size: 14px; color: var(--texto-2); margin-top: 8px; }

.nota { display: flex; gap: 12px; padding: 14px; border-radius: 12px; margin: 6px 0 14px; }
.nota strong { display: block; font-size: 13px; text-transform: uppercase; letter-spacing: .05em; margin-bottom: 2px; }
.nota p { margin: 0; font-size: 15.5px; }
.nota-ic { flex: none; width: 24px; height: 24px; }
.nota-ic svg { width: 24px; height: 24px; display: block; }
.nota-dato { background: var(--azul-s); color: #1E3A5F; }
.nota-dato .nota-ic { color: var(--navy-600); }
.nota-analogia { background: #CFFAFE; color: #164E63; }
.nota-analogia .nota-ic { color: #0E7490; }
.nota-seguridad { background: var(--amarillo-s); color: #713F12; border: 1px solid #FDE047; }
.nota-seguridad .nota-ic { color: #A16207; }
.nota-seguridad .nota-ic svg path:last-child { stroke: var(--amarillo-s); }

.tabla-cont { overflow-x: auto; margin: 4px 0 14px; border: 1px solid var(--linea); border-radius: 12px; }
.tabla { border-collapse: collapse; width: 100%; font-size: 15px; min-width: 460px; }
.tabla th, .tabla td { padding: 10px 12px; text-align: left; border-bottom: 1px solid var(--linea); vertical-align: top; }
.tabla thead th { background: var(--navy-900); color: var(--blanco); font-size: 14px; }
.tabla thead th:nth-child(2) { color: #86EFAC; }
.tabla thead th:nth-child(3) { color: #93C5FD; }
.tabla tbody th { color: var(--navy-900); font-weight: 700; background: var(--papel); }
.tabla tr:last-child th, .tabla tr:last-child td { border-bottom: 0; }

/* ---------------- Navegación de la lección ---------------- */
.lec-nav {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 25;
  display: flex; align-items: center; justify-content: space-between; gap: 10px;
  padding: 12px max(16px, calc((100vw - var(--ancho)) / 2 + 16px));
  padding-bottom: max(12px, env(safe-area-inset-bottom));
  background: rgba(6,18,36,.94);
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  border-top: 1px solid rgba(255,255,255,.08);
}
.lec-paso { color: var(--en-oscuro-2); font-size: 14px; font-variant-numeric: tabular-nums; }
.nav-btn { min-width: 120px; }
.nav-ayuda { text-align: center; color: var(--en-oscuro-2); font-size: 14px; margin-top: 12px; }

/* ---------------- Actividades ---------------- */
.act { margin-top: 4px; }
.act-enunciado { font-size: 18px; font-weight: 600; color: var(--navy-900); }
.opciones { display: grid; gap: 10px; }
.opciones-vf { grid-template-columns: 1fr 1fr; }
.opciones-visual { grid-template-columns: repeat(2, 1fr); }
.op {
  display: flex; align-items: center; gap: 12px; width: 100%; text-align: left;
  min-height: 56px; padding: 12px 14px; border-radius: 14px;
  border: 2px solid var(--linea); background: var(--blanco); color: var(--texto); cursor: pointer;
  font-size: 16.5px; transition: border-color .15s ease, background-color .15s ease;
}
.op:hover:not(:disabled) { border-color: var(--navy-600); background: #F8FBFF; }
.op:disabled { cursor: default; }
.op-txt { flex: 1; }
.op-marca { flex: none; width: 26px; height: 26px; }
.op-marca svg { width: 26px; height: 26px; }
.op.ok { border-color: var(--verde); background: var(--verde-s); color: #14532D; opacity: 1; }
.op.ok .op-marca { color: var(--verde-o); }
.op.mal { border-color: #FCA5A5; background: var(--rojo-s); color: #7F1D1D; opacity: 1; }
.op.mal .op-marca { color: var(--rojo); }
.opciones-vf .op { justify-content: center; font-weight: 700; font-size: 18px; }
.opciones-vf .op-txt { flex: none; }
.opciones-visual .op { flex-direction: column; text-align: center; padding: 10px; }
.opciones-visual .op-vis svg { width: 100%; max-width: 110px; height: auto; }
.opciones-visual .op-marca { position: absolute; }
.opciones-visual .op { position: relative; }
.opciones-visual .op-marca { top: 8px; right: 8px; }

.fb { margin-top: 14px; padding: 14px 16px; border-radius: 14px; animation: entrar .2s ease; }
.fb-titulo { display: flex; align-items: center; gap: 8px; font-weight: 800; font-size: 17px; }
.fb-titulo svg { width: 22px; height: 22px; flex: none; }
.fb-cuerpo { margin-top: 6px; }
.fb-cuerpo p { margin: 0 0 6px; font-size: 15.5px; }
.fb-cuerpo p:last-child { margin: 0; }
.fb-ok { background: var(--verde-s); color: #14532D; }
.fb-mal { background: var(--rojo-s); color: #7F1D1D; }
.fb-info { background: var(--azul-s); color: #1E3A5F; }
.act-acciones { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin-top: 12px; }
.act-acciones:empty { display: none; }

.cl-item { padding: 12px; border: 2px solid var(--linea); border-radius: 14px; margin-bottom: 8px; transition: border-color .15s ease; }
.cl-fila { display: flex; align-items: center; gap: 8px; font-weight: 600; margin-bottom: 8px; }
.cl-marca svg { width: 22px; height: 22px; display: block; }
.cl-marca:empty { display: none; }
.cl-cats { display: flex; flex-wrap: wrap; gap: 8px; }
.cl-item.ok { border-color: var(--verde); }
.cl-item.ok .cl-marca { color: var(--verde-o); }
.cl-item.mal { border-color: #FCA5A5; background: #FFF7F7; }
.cl-item.mal .cl-marca { color: var(--rojo); }
.cl-exp { margin-top: 8px; font-size: 15px; color: var(--texto-2); }

.chip {
  display: inline-flex; flex-direction: column; align-items: center; justify-content: center;
  min-height: 44px; padding: 8px 16px; border-radius: 999px; border: 2px solid var(--linea);
  background: var(--blanco); color: var(--navy-900); font-weight: 700; font-size: 15px; cursor: pointer;
}
.chip small { font-weight: 500; font-size: 12.5px; color: var(--texto-2); }
.chip:hover:not(:disabled) { border-color: var(--navy-600); }
.chip.activo { background: var(--navy-900); border-color: var(--navy-900); color: var(--blanco); }
.chip.activo small { color: var(--en-oscuro-2); }
.chip:disabled { cursor: default; }

.rel-grid { display: grid; grid-template-columns: 1fr 1.4fr; gap: 10px; }
.rel-col { display: grid; gap: 8px; align-content: start; }
.rel { display: flex; align-items: center; gap: 10px; text-align: left; min-height: 56px; padding: 10px 12px; border-radius: 12px; border: 2px solid var(--linea); background: var(--blanco); color: var(--texto); cursor: pointer; font-size: 15.5px; }
.rel:disabled { cursor: default; }
.rel-a { font-weight: 700; }
.rel-num { flex: none; width: 28px; height: 28px; border-radius: 50%; display: grid; place-items: center; font-size: 14px; font-weight: 800; background: var(--navy-900); color: var(--amarillo); }
.rel-num.rel-vacio { background: var(--papel); color: var(--texto-2); border: 2px dashed var(--linea); }
.rel-a.activo { border-color: var(--amarillo); background: var(--amarillo-s); box-shadow: 0 0 0 3px rgba(250,204,21,.35); }
.rel.asignado { border-color: var(--navy-600); }
.rel.ok { border-color: var(--verde); background: var(--verde-s); }
.rel.mal { border-color: #FCA5A5; background: var(--rojo-s); }

.calc { display: flex; flex-direction: column; gap: 6px; }
.calc-label { font-weight: 600; color: var(--texto-2); font-size: 15px; }
.calc-campo { display: flex; align-items: center; max-width: 260px; border: 2px solid var(--linea); border-radius: 14px; overflow: hidden; background: var(--blanco); }
.calc-campo:focus-within { border-color: var(--navy-600); }
.calc-campo input { flex: 1; min-width: 0; border: 0; padding: 12px 14px; font-size: 22px; font-weight: 700; color: var(--navy-900); background: transparent; outline: none; font-variant-numeric: tabular-nums; }
.calc-unidad { padding: 0 16px; font-weight: 800; color: var(--navy-600); align-self: stretch; display: grid; place-items: center; background: var(--papel); border-left: 2px solid var(--linea); }
.calc-campo.ok { border-color: var(--verde); background: var(--verde-s); }
.calc-campo.mal { border-color: #FCA5A5; }

/* ---------------- Widget de energía ---------------- */
.we { background: var(--navy-900); color: var(--en-oscuro); border-radius: 16px; padding: 16px; margin: 6px 0 14px; }
.we-ejemplos { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 14px; }
.we .chip { background: var(--navy-800); border-color: rgba(255,255,255,.14); color: var(--blanco); border-radius: 12px; }
.we .chip small { color: var(--en-oscuro-2); }
.we .chip:hover { border-color: var(--verde); }
.we-ctrl { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 4px 10px; margin-bottom: 12px; }
.we-ctrl label { font-weight: 600; }
.we-ctrl output { font-weight: 800; color: var(--amarillo); font-variant-numeric: tabular-nums; }
.we-ctrl input { grid-column: 1 / -1; width: 100%; accent-color: var(--verde); height: 32px; }
.we-res { background: var(--navy-800); border-radius: 12px; padding: 12px 14px; }
.we-res span { color: var(--en-oscuro-2); font-size: 14px; display: block; }
.we-res strong { font-size: 30px; color: var(--blanco); font-variant-numeric: tabular-nums; }
.we-res small { display: block; color: var(--en-oscuro-2); font-size: 14px; }
.we-res .barra { background: rgba(255,255,255,.12); height: 10px; }

/* ---------------- Cierre de lección ---------------- */
.cierre-cab { display: flex; gap: 14px; align-items: center; margin-bottom: 14px; }
.cierre-ic { flex: none; width: 60px; height: 60px; border-radius: 18px; display: grid; place-items: center; background: var(--navy-900); color: var(--amarillo); }
.cierre-ic svg { width: 34px; height: 34px; }
.cierre-cab p { margin: 0; color: var(--texto-2); }
.cierre-nota { color: var(--texto-2); font-size: 15px; }
.resumen-t { font-size: 17px; color: var(--navy-900); margin-top: 8px; }

/* ---------------- Progreso ---------------- */
.cifras-prog { margin-top: 8px; }
.prog-mod { margin-bottom: 12px; }
.prog-mod-t { display: flex; justify-content: space-between; gap: 10px; font-size: 15px; }
.prog-mod-t span:last-child { color: var(--texto-2); white-space: nowrap; }
.logros { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 10px; }
.logro { display: flex; gap: 10px; align-items: center; padding: 12px; border-radius: 12px; background: var(--papel); color: var(--texto-2); }
.logro-ic { flex: none; width: 40px; height: 40px; border-radius: 12px; display: grid; place-items: center; background: var(--linea); color: #94A3B8; }
.logro-ic svg { width: 22px; height: 22px; }
.logro strong { display: block; color: var(--texto); font-size: 15px; }
.logro small { font-size: 13.5px; }
.logro.ok { background: var(--amarillo-s); }
.logro.ok .logro-ic { background: var(--navy-900); color: var(--amarillo); }

/* ---------------- Barra de audio ---------------- */
.audiobar {
  position: fixed; left: 50%; transform: translateX(-50%); z-index: 40;
  bottom: calc(var(--nav-h) + 8px + env(safe-area-inset-bottom));
  width: min(var(--ancho) - 32px, calc(100% - 24px));
  display: flex; align-items: center; justify-content: space-between; gap: 10px;
  padding: 10px 12px; border-radius: 16px;
  background: var(--amarillo); color: var(--navy-950);
  box-shadow: 0 10px 30px rgba(0,0,0,.35);
}
body:not([data-vista="leccion"]) .audiobar { bottom: max(16px, env(safe-area-inset-bottom)); }
.audiobar[hidden] { display: none; }
.ab-info { display: flex; align-items: center; gap: 10px; min-width: 0; }
.ab-textos { display: flex; flex-direction: column; min-width: 0; }
.ab-titulo { font-size: 14px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.ab-prog { font-size: 12.5px; opacity: .8; }
.ab-onda { display: flex; gap: 3px; align-items: flex-end; height: 18px; }
.ab-onda i { width: 4px; background: var(--navy-900); border-radius: 2px; animation: onda 1s ease-in-out infinite; }
.ab-onda i:nth-child(2) { animation-delay: .15s; } .ab-onda i:nth-child(3) { animation-delay: .3s; }
@keyframes onda { 0%,100% { height: 5px; } 50% { height: 18px; } }
.ab-controles { display: flex; align-items: center; gap: 6px; flex: none; }
.ab-btn { width: 44px; height: 44px; border-radius: 50%; border: 0; background: var(--navy-900); color: var(--amarillo); display: grid; place-items: center; cursor: pointer; }
.ab-btn svg { width: 20px; height: 20px; }
.ab-vel select { height: 44px; border-radius: 12px; border: 2px solid var(--navy-900); background: transparent; font-weight: 800; padding: 0 6px; color: var(--navy-950); font-size: 15px; }

/* ---------------- Avisos y modal ---------------- */
.aviso {
  position: fixed; left: 50%; top: 72px; transform: translate(-50%, -20px); z-index: 60;
  display: flex; align-items: center; gap: 8px; max-width: calc(100% - 32px);
  padding: 12px 18px; border-radius: 14px; background: var(--blanco); color: var(--texto);
  box-shadow: 0 10px 30px rgba(0,0,0,.3); font-weight: 600; font-size: 15px;
  opacity: 0; pointer-events: none; transition: opacity .2s ease, transform .2s ease;
}
.aviso.visible { opacity: 1; transform: translate(-50%, 0); }
.aviso svg { width: 22px; height: 22px; flex: none; color: var(--amarillo); }
.aviso-logro { background: var(--navy-900); color: var(--blanco); border: 2px solid var(--amarillo); }

.modal { position: fixed; inset: 0; z-index: 70; display: grid; place-items: center; padding: 16px; }
.modal[hidden] { display: none; }
.modal-fondo { position: absolute; inset: 0; background: rgba(3,10,22,.7); }
.modal-caja { position: relative; background: var(--blanco); color: var(--texto); border-radius: 20px; padding: 22px; max-width: 420px; width: 100%; box-shadow: 0 20px 50px rgba(0,0,0,.4); }
.modal-caja h2 { font-size: 20px; }
.modal-acciones { display: flex; justify-content: flex-end; gap: 10px; flex-wrap: wrap; margin-top: 16px; }
.modal-acciones .btn-secundario { color: var(--texto); border-color: var(--linea); }
.noscript { background: var(--amarillo); color: var(--navy-900); padding: 14px; border-radius: 12px; }


/* ---------------- Modelos 3D ---------------- */
.v3d { display: grid; gap: 12px; margin: 6px 0 16px; padding: 12px; border-radius: 18px; background: var(--navy-900); color: var(--en-oscuro); }
.v3d-lienzo { position: relative; height: clamp(300px, 52vw, 400px); border-radius: 12px; overflow: hidden;
  background: radial-gradient(120% 90% at 50% 0%, #1F4677 0%, #0F2747 55%, #091A33 100%); }
.v3d-lienzo canvas { position: absolute; inset: 0; width: 100%; height: 100%; display: block; touch-action: pan-y; cursor: grab; }
.v3d-lienzo canvas:active { cursor: grabbing; }
.v3d-etiquetas { position: absolute; inset: 0; pointer-events: none; }
.v3d-et { position: absolute; left: 0; top: 0; margin: -14px 0 0; white-space: nowrap; font-size: 12.5px; font-weight: 700;
  padding: 3px 9px; border-radius: 999px; background: rgba(6,18,36,.82); color: var(--blanco); border: 1px solid rgba(255,255,255,.18);
  translate: -50% 0; }
.v3d-et.izq { translate: 0 -40%; }
.v3d-et.activa { background: var(--amarillo); color: var(--navy-950); border-color: var(--amarillo); }
.v3d-ayuda { position: absolute; left: 50%; bottom: 10px; transform: translateX(-50%); display: flex; align-items: center; gap: 6px;
  font-size: 13px; font-weight: 600; color: var(--en-oscuro); background: rgba(6,18,36,.7); padding: 5px 12px; border-radius: 999px;
  pointer-events: none; transition: opacity .4s ease; white-space: nowrap; }
.v3d-ayuda svg { width: 18px; height: 18px; }
.v3d-lienzo.tocado .v3d-ayuda { opacity: 0; }
.v3d-lienzo-sin { height: auto; display: grid; place-items: center; padding: 28px 18px; }
.v3d-sin { text-align: center; color: var(--en-oscuro); max-width: 30em; font-size: 15px; }
.v3d-barra { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 8px; }
.v3d-btn { display: inline-flex; align-items: center; gap: 8px; min-height: 44px; padding: 8px 16px; border-radius: 999px; cursor: pointer;
  border: 2px solid rgba(255,255,255,.25); background: transparent; color: var(--blanco); font-weight: 700; font-size: 15px; }
.v3d-btn svg { width: 20px; height: 20px; }
.v3d-btn:hover { background: rgba(255,255,255,.07); }
.v3d-btn-prim { background: var(--verde); border-color: var(--verde); color: var(--navy-950); }
.v3d-btn-prim:hover { background: #2fd56a; }
.v3d-btn-prim[aria-pressed="true"] { background: var(--amarillo); border-color: var(--amarillo); }
.v3d-giro[aria-pressed="true"] { border-color: var(--verde); color: #86EFAC; }
.v3d-vistas, .v3d-piezas, .v3d-seg { display: flex; flex-wrap: wrap; gap: 6px; }
.v3d-chip { min-height: 40px; padding: 6px 14px; border-radius: 999px; cursor: pointer; font-weight: 600; font-size: 14.5px;
  border: 1.5px solid rgba(255,255,255,.18); background: var(--navy-800); color: var(--en-oscuro); }
.v3d-chip:hover { border-color: var(--verde); }
.v3d-chip[aria-pressed="true"] { background: var(--blanco); color: var(--navy-900); border-color: var(--blanco); }
.v3d-piezas .v3d-chip[aria-pressed="true"] { background: var(--amarillo); border-color: var(--amarillo); color: var(--navy-950); }
.v3d-info { background: var(--navy-800); border-radius: 12px; padding: 12px 14px; min-height: 64px; }
.v3d-info h4 { margin: 0 0 4px; font-size: 16px; color: var(--amarillo); }
.v3d-info p { margin: 0; font-size: 15px; }
.v3d-info-vacia { color: var(--en-oscuro-2); }
.v3d-control { display: grid; gap: 6px; }
.v3d-lab { font-size: 12.5px; font-weight: 800; text-transform: uppercase; letter-spacing: .07em; color: var(--en-oscuro-2); }
.v3d-check { display: inline-flex; align-items: center; gap: 8px; font-size: 14.5px; cursor: pointer; min-height: 44px; }
.v3d-check input { width: 20px; height: 20px; accent-color: var(--verde); }
.v3d-ficha { background: var(--blanco); color: var(--texto); border-radius: 12px; padding: 12px 14px; }
.v3d-dl { display: grid; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); gap: 8px 16px; margin: 0 0 10px; }
.v3d-dl div { border-bottom: 1px solid var(--linea); padding-bottom: 6px; }
.v3d-dl dt { font-size: 12.5px; color: var(--texto-2); font-weight: 600; }
.v3d-dl dd { margin: 0; font-weight: 700; color: var(--navy-900); font-variant-numeric: tabular-nums; }
.v3d-notas { margin: 0 0 8px; padding-left: 1.1em; font-size: 14.5px; color: #24344D; }
.v3d-notas li { margin-bottom: 4px; }
.v3d-aclara { margin: 0; font-size: 13.5px; color: var(--texto-2); }
@media (max-width: 560px) {
  .v3d { padding: 10px; margin-inline: -6px; }
  .v3d-lienzo { height: 330px; }
  .v3d-chip { font-size: 14px; padding-inline: 12px; }
}

/* ---------------- Pantallas pequeñas ---------------- */
@media (max-width: 720px) {
  .hero { grid-template-columns: 1fr; padding-top: 12px; }
  .hero-arte { order: -1; max-width: 220px; }
  .cifras { grid-template-columns: repeat(2, 1fr); }
  .pasos-info { grid-template-columns: 1fr; }
}
@media (max-width: 560px) {
  body { font-size: 16.5px; }
  main { padding: 14px 12px 120px; }
  .marca span { display: none; }
  .topnav a { padding: 8px 10px; font-size: 14.5px; }
  .pantalla { padding: 18px 16px; border-radius: 18px; }
  .hero-acciones .btn { width: 100%; }
  .rel-grid { grid-template-columns: 1fr; }
  .rel-col + .rel-col { padding-top: 6px; border-top: 2px dashed var(--linea); }
  .nav-btn { min-width: 0; flex: 1; padding-inline: 14px; }
  .lec-paso { flex: none; }
  .modulo { padding: 14px; gap: 12px; }
  .mod-num { width: 40px; height: 40px; font-size: 19px; }
  .ab-vel select { padding: 0 2px; }
  .tabla { min-width: 0; }
  .tabla thead { display: none; }
  .tabla tr { display: block; border-bottom: 1px solid var(--linea); padding: 4px 0 8px; }
  .tabla tr:last-child { border-bottom: 0; }
  .tabla tbody th[scope="row"] { display: block; background: none; border: 0; padding: 8px 12px 4px; }
  .tabla td { display: flex; justify-content: space-between; gap: 12px; border: 0; padding: 3px 12px; text-align: right; }
  .tabla td::before { content: attr(data-l); font-weight: 600; color: var(--texto-2); text-align: left; }
}
@media (max-width: 380px) {
  .nav-btn { padding-inline: 10px; font-size: 15px; gap: 4px; }
  .lec-nav { gap: 6px; padding-inline: 10px; }
}