/* Derecho Claro — hoja de estilos única, sin frameworks */
:root {
  --tinta: #17202b;
  --tinta-suave: #4b5a6b;
  --papel: #fbf9f4;
  --papel-2: #ffffff;
  --linea: #e3ded2;
  --azul: #16324f;
  --azul-2: #21507c;
  --acento: #b4552d;
  --verde: #2f6b4f;
  --ambar: #8a6a1f;
  --sombra: 0 1px 2px rgba(20, 26, 38, .06), 0 8px 24px -12px rgba(20, 26, 38, .25);
  --radio: 14px;
  --max: 1180px;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
html[data-tema="oscuro"] {
  --tinta: #e8e6df;
  --tinta-suave: #a8b1bd;
  --papel: #10161d;
  --papel-2: #161e27;
  --linea: #2a3644;
  --azul: #9fc4e8;
  --azul-2: #7fb0dd;
  --acento: #e0895c;
  --verde: #7fc7a0;
  --sombra: 0 1px 2px rgba(0, 0, 0, .4), 0 10px 30px -12px rgba(0, 0, 0, .7);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--sans);
  color: var(--tinta);
  background:
    radial-gradient(1200px 600px at 85% -10%, color-mix(in srgb, var(--azul) 8%, transparent), transparent 70%),
    var(--papel);
  -webkit-font-smoothing: antialiased;
  line-height: 1.6;
}
h1, h2, h3, h4 { font-family: var(--serif); line-height: 1.2; margin: 0 0 .4em; letter-spacing: -.01em; }
p { margin: 0 0 1em; }
a { color: var(--azul-2); text-decoration-thickness: 1px; text-underline-offset: 2px; }
a:hover { color: var(--acento); }
button, input, select, textarea { font: inherit; color: inherit; }
.sr, .saltar:not(:focus) { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.saltar { position: fixed; top: 8px; left: 8px; z-index: 100; background: var(--azul); color: #fff; padding: .6rem 1rem; border-radius: 8px; }

/* ------------------------------- cabecera ------------------------------ */
.cabecera {
  position: sticky; top: 0; z-index: 30;
  background: color-mix(in srgb, var(--papel) 88%, transparent);
  backdrop-filter: blur(14px) saturate(1.3);
  border-bottom: 1px solid var(--linea);
}
.barra {
  max-width: var(--max); margin: 0 auto; padding: .7rem 1.1rem;
  display: flex; align-items: center; gap: 1rem;
}
.marca { display: flex; align-items: center; gap: .6rem; text-decoration: none; color: var(--azul); }
.logo { width: 34px; height: 34px; flex: none; }
.marca-txt { display: flex; flex-direction: column; line-height: 1.05; }
.marca-txt b { font-family: var(--serif); font-size: 1.16rem; color: var(--tinta); }
.marca-txt i { font-style: normal; font-size: .68rem; letter-spacing: .12em; text-transform: uppercase; color: var(--tinta-suave); }

.buscador-cab { flex: 1 1 320px; display: flex; max-width: 560px; position: relative; }
.buscador-cab input {
  width: 100%; padding: .62rem 2.6rem .62rem .95rem; border-radius: 999px;
  border: 1px solid var(--linea); background: var(--papel-2); box-shadow: inset 0 1px 2px rgba(0,0,0,.03);
}
.buscador-cab input:focus { outline: 2px solid var(--azul-2); outline-offset: 1px; }
.buscador-cab button {
  position: absolute; right: 5px; top: 50%; transform: translateY(-50%);
  border: 0; background: transparent; color: var(--tinta-suave); padding: .4rem; cursor: pointer; border-radius: 50%;
}
.buscador-cab button:hover { color: var(--acento); }
.buscador-cab svg { width: 20px; height: 20px; display: block; }

.menu { display: flex; gap: .2rem; }
.menu a {
  padding: .45rem .7rem; border-radius: 9px; text-decoration: none; color: var(--tinta-suave);
  font-size: .93rem; font-weight: 500; white-space: nowrap;
}
.menu a:hover { background: color-mix(in srgb, var(--azul) 8%, transparent); color: var(--tinta); }
.menu a[aria-current="page"] { color: var(--azul); background: color-mix(in srgb, var(--azul) 12%, transparent); }
.tema { border: 1px solid var(--linea); background: var(--papel-2); border-radius: 10px; width: 38px; height: 38px; display: grid; place-items: center; cursor: pointer; color: var(--tinta-suave); }
.tema:hover { color: var(--acento); border-color: var(--acento); }
.tema svg { width: 20px; height: 20px; }
.progreso { height: 2px; background: linear-gradient(90deg, transparent, var(--azul-2), transparent); background-size: 40% 100%; animation: cargando 1s linear infinite; }
@keyframes cargando { from { background-position: -40% 0; } to { background-position: 140% 0; } }

main { max-width: var(--max); margin: 0 auto; padding: 1.6rem 1.1rem 4rem; min-height: 60vh; }
main:focus { outline: none; }

/* ------------------------------- portada ------------------------------- */
.hero { padding: 2.6rem 0 1.6rem; max-width: 780px; }
.hero .etiqueta { display: inline-block; font-size: .74rem; letter-spacing: .14em; text-transform: uppercase; color: var(--acento); font-weight: 700; margin-bottom: .7rem; }
.hero h1 { font-size: clamp(2rem, 4.6vw, 3.1rem); }
.hero p { font-size: 1.08rem; color: var(--tinta-suave); max-width: 62ch; }

.buscador-grande { display: flex; gap: .5rem; margin: 1.4rem 0 .8rem; flex-wrap: wrap; }
.buscador-grande input {
  flex: 1 1 320px; padding: .95rem 1.2rem; border-radius: 12px; border: 1px solid var(--linea);
  background: var(--papel-2); font-size: 1.02rem; box-shadow: var(--sombra);
}
.buscador-grande input:focus { outline: 2px solid var(--azul-2); outline-offset: 1px; }
.btn {
  display: inline-flex; align-items: center; gap: .45rem; padding: .8rem 1.25rem; border-radius: 12px;
  border: 1px solid transparent; background: var(--azul); color: #fff; font-weight: 600; cursor: pointer;
  text-decoration: none; transition: transform .06s ease, filter .15s ease;
}
.btn:hover { filter: brightness(1.08); color: #fff; }
.btn:active { transform: translateY(1px); }
.btn.secundario { background: transparent; color: var(--azul); border-color: var(--linea); }
.btn.secundario:hover { border-color: var(--azul-2); color: var(--azul-2); }
.btn.pequeno { padding: .45rem .8rem; font-size: .88rem; border-radius: 9px; }
.btn[disabled] { opacity: .55; cursor: not-allowed; }

.chips { display: flex; flex-wrap: wrap; gap: .4rem; margin: .4rem 0 1rem; }
.chip {
  border: 1px solid var(--linea); background: var(--papel-2); border-radius: 999px;
  padding: .32rem .8rem; font-size: .86rem; cursor: pointer; color: var(--tinta-suave); text-decoration: none;
}
.chip:hover { border-color: var(--azul-2); color: var(--azul-2); }
.chip[aria-pressed="true"], .chip.activo { background: var(--azul); border-color: var(--azul); color: #fff; }

.rejilla { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 1rem; margin: 1.6rem 0; }
.tarjeta {
  background: var(--papel-2); border: 1px solid var(--linea); border-radius: var(--radio);
  padding: 1.1rem 1.15rem; box-shadow: var(--sombra); text-decoration: none; color: inherit; display: block;
  transition: transform .15s ease, border-color .15s ease;
}
a.tarjeta:hover { transform: translateY(-2px); border-color: var(--azul-2); color: inherit; }
.tarjeta h3 { font-size: 1.1rem; margin-bottom: .3rem; }
.tarjeta p { color: var(--tinta-suave); font-size: .93rem; margin: 0; }
.tarjeta .num { font-family: var(--serif); font-size: 1.9rem; color: var(--azul); line-height: 1; display: block; margin-bottom: .3rem; }
.tarjeta .pie-t { margin-top: .8rem; font-size: .78rem; letter-spacing: .06em; text-transform: uppercase; color: var(--tinta-suave); }

/* ------------------------------ resultados ----------------------------- */
.cab-resultados { display: flex; align-items: baseline; justify-content: space-between; gap: 1rem; flex-wrap: wrap; margin-bottom: 1rem; }
.cab-resultados h1 { font-size: 1.6rem; margin: 0; }
.cab-resultados .resumen { color: var(--tinta-suave); font-size: .93rem; }

.filtros { display: flex; flex-wrap: wrap; gap: .8rem 1.2rem; align-items: center; margin: 0 0 1.2rem; padding: .8rem 1rem; background: var(--papel-2); border: 1px solid var(--linea); border-radius: 12px; }
.filtros label { display: flex; align-items: center; gap: .4rem; font-size: .88rem; color: var(--tinta-suave); }
.filtros select { border: 1px solid var(--linea); border-radius: 8px; padding: .35rem .5rem; background: var(--papel-2); }

.lista { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: .7rem; }
.resultado {
  background: var(--papel-2); border: 1px solid var(--linea); border-radius: 12px; padding: .95rem 1.1rem;
  text-decoration: none; color: inherit; display: block;
}
.resultado:hover { border-color: var(--azul-2); color: inherit; }
.resultado h3 { font-size: 1.05rem; margin: 0 0 .25rem; color: var(--azul-2); }
.resultado .ruta { font-size: .8rem; color: var(--acento); font-weight: 600; letter-spacing: .02em; margin-bottom: .35rem; }
.resultado .frag { font-size: .92rem; color: var(--tinta); margin: 0; }
.resultado .meta { margin-top: .5rem; display: flex; gap: .5rem; flex-wrap: wrap; font-size: .74rem; color: var(--tinta-suave); }
.resultado mark { background: color-mix(in srgb, var(--acento) 22%, transparent); color: inherit; padding: 0 .12em; border-radius: 3px; }
.insignia { border: 1px solid var(--linea); border-radius: 999px; padding: .08rem .5rem; text-transform: uppercase; letter-spacing: .06em; }
.insignia.laboral { border-color: color-mix(in srgb, var(--azul) 40%, var(--linea)); color: var(--azul-2); }
.insignia.civil { border-color: color-mix(in srgb, var(--verde) 40%, var(--linea)); color: var(--verde); }
.insignia.fiscal { border-color: color-mix(in srgb, var(--ambar) 45%, var(--linea)); color: var(--ambar); }
.insignia.vivienda { border-color: color-mix(in srgb, var(--acento) 45%, var(--linea)); color: var(--acento); }

.paginacion { display: flex; gap: .5rem; align-items: center; justify-content: center; margin: 1.6rem 0 0; }
.vacio { text-align: center; padding: 3rem 1rem; color: var(--tinta-suave); }
.vacio h2 { color: var(--tinta); }

/* -------------------------------- lector ------------------------------- */
.lector { display: grid; grid-template-columns: 270px minmax(0, 1fr); gap: 1.8rem; align-items: start; }
.indice { position: sticky; top: 82px; max-height: calc(100vh - 110px); overflow: auto; padding-right: .4rem; }
.indice h2 { font-size: .74rem; letter-spacing: .13em; text-transform: uppercase; color: var(--tinta-suave); font-family: var(--sans); }
.indice ol { list-style: none; margin: 0; padding: 0; font-size: .86rem; border-left: 1px solid var(--linea); }
.indice li a { display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; padding: .3rem .6rem; color: var(--tinta-suave); text-decoration: none; border-left: 2px solid transparent; margin-left: -1px; line-height: 1.35; }
.indice li a:hover { color: var(--azul-2); border-left-color: var(--azul-2); background: color-mix(in srgb, var(--azul) 5%, transparent); }
.indice li.nivel-2 a { padding-left: 1.1rem; }
.indice li.nivel-3 a { padding-left: 1.6rem; }

.articulo { max-width: 76ch; }
.articulo > header { border-bottom: 2px solid var(--linea); padding-bottom: 1rem; margin-bottom: 1.4rem; }
.articulo h1 { font-size: clamp(1.6rem, 3.2vw, 2.2rem); }
.migas { font-size: .82rem; color: var(--tinta-suave); margin-bottom: .5rem; display: flex; gap: .35rem; flex-wrap: wrap; }
.migas a { color: var(--tinta-suave); }
.seccion { margin-bottom: 2rem; scroll-margin-top: 90px; }
.seccion h2 { font-size: 1.18rem; margin-bottom: .6rem; color: var(--azul); }
.seccion .ruta { font-size: .76rem; text-transform: uppercase; letter-spacing: .07em; color: var(--acento); font-weight: 700; margin-bottom: .3rem; }
.seccion .texto { font-family: var(--serif); font-size: 1.02rem; text-align: justify; hyphens: auto; white-space: pre-wrap; }
.seccion .texto p { margin: 0 0 .8em; }
.fuente-doc { margin-top: 1rem; font-size: .85rem; color: var(--tinta-suave); word-break: break-word; }

/* ----------------------------- calculadoras ---------------------------- */
.calc { display: grid; grid-template-columns: minmax(0, 420px) minmax(0, 1fr); gap: 1.6rem; align-items: start; }
.calc .panel { background: var(--papel-2); border: 1px solid var(--linea); border-radius: var(--radio); padding: 1.2rem; box-shadow: var(--sombra); }
.campo { margin-bottom: .9rem; }
.campo label { display: block; font-size: .84rem; font-weight: 600; color: var(--tinta-suave); margin-bottom: .28rem; }
.campo input, .campo select {
  width: 100%; padding: .55rem .7rem; border: 1px solid var(--linea); border-radius: 9px; background: var(--papel);
}
.campo input:focus, .campo select:focus { outline: 2px solid var(--azul-2); outline-offset: 1px; }
.campo .ayuda { font-size: .76rem; color: var(--tinta-suave); margin-top: .25rem; }
.fila { display: grid; grid-template-columns: 1fr 1fr; gap: .7rem; }
.check { display: flex; align-items: center; gap: .5rem; font-size: .9rem; margin-bottom: .7rem; }
.check input { width: 18px; height: 18px; }

.resultado-calc h2 { font-size: 1.25rem; margin-top: 0; }
.cifra-grande { font-family: var(--serif); font-size: clamp(2rem, 5vw, 2.8rem); color: var(--azul); line-height: 1; }
.cifra-grande small { font-size: .45em; color: var(--tinta-suave); font-family: var(--sans); }
table.tabla { width: 100%; border-collapse: collapse; font-size: .9rem; margin: .8rem 0 1rem; }
table.tabla th, table.tabla td { text-align: left; padding: .42rem .5rem; border-bottom: 1px solid var(--linea); }
table.tabla th { font-size: .74rem; text-transform: uppercase; letter-spacing: .06em; color: var(--tinta-suave); font-weight: 700; }
table.tabla td.num, table.tabla th.num { text-align: right; font-variant-numeric: tabular-nums; }
table.tabla tr.total td { font-weight: 700; border-bottom: 2px solid var(--azul-2); }
.aviso-caja { font-size: .82rem; color: var(--tinta-suave); border-left: 3px solid var(--acento); padding: .1rem 0 .1rem .8rem; margin: .8rem 0; }
.aviso-caja.fuerte { border-color: var(--ambar); background: color-mix(in srgb, var(--ambar) 7%, transparent); padding: .7rem .9rem; border-radius: 0 10px 10px 0; }
.barra-tramo { display: flex; height: 10px; border-radius: 6px; overflow: hidden; margin: .6rem 0 1rem; }
.barra-tramo span { height: 100%; }

/* ------------------------------- asistente ----------------------------- */
.asistente { display: grid; grid-template-columns: minmax(0, 1fr) 330px; gap: 1.6rem; align-items: start; }
.hilo { display: flex; flex-direction: column; gap: .9rem; min-height: 320px; }
.mensaje { max-width: 62ch; padding: .8rem 1rem; border-radius: 14px; font-size: .95rem; }
.mensaje.usuario { align-self: flex-end; background: var(--azul); color: #fff; border-bottom-right-radius: 4px; }
.mensaje.bot { align-self: flex-start; background: var(--papel-2); border: 1px solid var(--linea); border-bottom-left-radius: 4px; box-shadow: var(--sombra); }
.mensaje.bot p:last-child { margin-bottom: 0; }
.mensaje.bot h4 { font-family: var(--sans); font-size: .82rem; text-transform: uppercase; letter-spacing: .08em; color: var(--tinta-suave); margin: 1rem 0 .35rem; }
.mensaje.bot ul, .mensaje.bot ol { margin: .3rem 0 .7rem 1.1rem; padding: 0; }
.mensaje.bot li { margin-bottom: .3rem; }
.mensaje.bot hr { border: 0; border-top: 1px solid var(--linea); margin: 1rem 0; }
.mensaje.bot a.cita { display: inline-block; font-size: .74rem; padding: 0 .28em; border-radius: 4px; background: color-mix(in srgb, var(--acento) 14%, transparent); color: var(--acento); text-decoration: none; vertical-align: baseline; }
.mensaje .fuentes-msg { margin-top: .6rem; display: flex; flex-wrap: wrap; gap: .3rem; }
.cita { font-size: .74rem; border: 1px solid var(--linea); border-radius: 6px; padding: .05rem .35rem; text-decoration: none; color: var(--azul-2); }
.cita:hover { border-color: var(--azul-2); }
.pensando { display: inline-flex; gap: .3rem; align-items: center; }
.pensando i { width: 6px; height: 6px; border-radius: 50%; background: var(--tinta-suave); animation: latido 1s infinite; }
.pensando i:nth-child(2) { animation-delay: .15s; }
.pensando i:nth-child(3) { animation-delay: .3s; }
@keyframes latido { 0%, 60%, 100% { opacity: .25; transform: translateY(0); } 30% { opacity: 1; transform: translateY(-3px); } }
.escribir { display: flex; gap: .5rem; margin-top: 1rem; position: sticky; bottom: 1rem; }
.escribir textarea {
  flex: 1; resize: none; padding: .75rem .9rem; border-radius: 12px; border: 1px solid var(--linea);
  background: var(--papel-2); min-height: 52px; max-height: 180px; box-shadow: var(--sombra);
}
.escribir textarea:focus { outline: 2px solid var(--azul-2); outline-offset: 1px; }
.lateral h2 { font-size: .78rem; letter-spacing: .12em; text-transform: uppercase; color: var(--tinta-suave); font-family: var(--sans); }
.lateral .sugerencia { display: block; width: 100%; text-align: left; background: var(--papel-2); border: 1px solid var(--linea); border-radius: 10px; padding: .6rem .75rem; margin-bottom: .45rem; font-size: .88rem; cursor: pointer; }
.lateral .sugerencia:hover { border-color: var(--azul-2); color: var(--azul-2); }

/* -------------------------------- pie ---------------------------------- */
.pie { border-top: 1px solid var(--linea); background: color-mix(in srgb, var(--papel-2) 60%, transparent); }
.barra-pie { max-width: var(--max); margin: 0 auto; padding: 1.6rem 1.1rem; font-size: .84rem; color: var(--tinta-suave); }
.barra-pie .aviso { max-width: 88ch; margin-bottom: 0; }

.toast {
  position: fixed; left: 50%; bottom: 1.4rem; transform: translate(-50%, 2rem);
  background: var(--tinta); color: var(--papel); padding: .7rem 1.1rem; border-radius: 10px;
  opacity: 0; pointer-events: none; transition: .25s ease; z-index: 90; font-size: .9rem; max-width: 90vw;
}
.toast.visible { opacity: 1; transform: translate(-50%, 0); }

@media (max-width: 980px) {
  .lector, .calc, .asistente { grid-template-columns: 1fr; }
  .indice { position: static; max-height: 240px; order: 2; }
  .menu { display: none; }
}
@media (max-width: 620px) {
  .buscador-cab { display: none; }
  .barra { gap: .6rem; }
  main { padding-top: 1rem; }
  .hero { padding-top: 1.2rem; }
  .fila { grid-template-columns: 1fr; }
}
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
}