/* =============================================================
   1. Tokens
   ============================================================= */
:root {
  --azul-oscuro: #0d1b3e;
  --azul-oscuro-2: #16265e;
  --blanco: #ffffff;
  --gris-claro: #f3f4f8;
  --gris-medio: #e2e5ee;
  --texto: #1a1f36;
  --texto-suave: #5b6178;
  --morado: #7c4dff;
  --morado-oscuro: #5e35d6;
  --morado-suave: #efe9ff;
  --exito: #16a34a;
  --alerta: #b45309;
  --borde: #e2e5ee;
  --bg: var(--blanco);
  --sombra: 0 8px 24px rgba(13, 27, 62, 0.08);
  --radio: 14px;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0a132c;
    --blanco: #101d42;
    --gris-claro: #0e1c3f;
    --gris-medio: #23305c;
    --texto: #eef1fb;
    --texto-suave: #a9b1d6;
    --borde: #23305c;
    --morado-suave: #201a44;
  }
}

/* =============================================================
   2. Reset & base
   ============================================================= */
*, *::before, *::after { box-sizing: border-box; margin: 0; }
html { -webkit-text-size-adjust: 100%; tab-size: 2; overflow-x: clip; scroll-behavior: smooth; }
body {
  font-family: "Inter", system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.65;
  color: var(--texto);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  overflow-x: clip;
  overscroll-behavior-y: none;
}
img, svg, video { display: block; max-width: 100%; }
button { font: inherit; color: inherit; cursor: pointer; border: 0; background: none; }
a { color: inherit; text-decoration: none; }
p { text-wrap: pretty; }
h1, h2, h3, h4 { font-family: "Manrope", "Inter", system-ui, sans-serif; text-wrap: balance; line-height: 1.15; letter-spacing: -0.01em; color: var(--azul-oscuro); }
@media (prefers-color-scheme: dark) { h1, h2, h3, h4 { color: var(--blanco); } }
::selection { background: var(--morado-suave); color: var(--azul-oscuro); }
:focus-visible { outline: 2px solid var(--morado); outline-offset: 3px; border-radius: 4px; }

.skip-link {
  position: fixed; top: -100px; left: 1rem;
  padding: .6rem 1rem; background: var(--azul-oscuro); color: var(--blanco);
  z-index: 9999; border-radius: 8px; font-weight: 600;
}
.skip-link:focus { top: 1rem; }

.container { max-width: 1080px; margin-inline: auto; padding-inline: 1.25rem; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

/* =============================================================
   3. Header
   ============================================================= */
.site-header { border-bottom: 1px solid var(--borde); background: var(--bg); position: sticky; top: 0; z-index: 40; }
.header-inner { display: flex; align-items: center; justify-content: space-between; padding-block: .85rem; gap: 1rem; }
.logo { display: flex; align-items: center; gap: .5rem; font-family: "Manrope", sans-serif; font-weight: 800; font-size: 1.05rem; color: var(--azul-oscuro); }
@media (prefers-color-scheme: dark) { .logo { color: var(--blanco); } }
.logo svg { color: var(--morado); flex-shrink: 0; }
.header-nav { display: flex; gap: 1.25rem; font-size: .92rem; font-weight: 600; }
.header-nav a { color: var(--texto-suave); transition: color .2s var(--ease-out); }
.header-nav a:hover { color: var(--morado); }

/* =============================================================
   4. Hero + tool card
   ============================================================= */
.hero { padding-block: 2rem 1.5rem; }
.hero h1 {
  font-size: clamp(1.7rem, 4.2vw, 2.6rem);
  max-width: 20ch;
  margin-inline: auto;
  text-align: center;
}
.hero-subtitle {
  max-width: 56ch; margin: .85rem auto 1.75rem; text-align: center;
  color: var(--texto-suave); font-size: 1.05rem;
}

.tool-card {
  background: var(--gris-claro);
  border: 1px solid var(--borde);
  border-radius: var(--radio);
  padding: 1.25rem;
  box-shadow: var(--sombra);
}

.panels { display: grid; grid-template-columns: 1fr; gap: 1rem; }
@media (min-width: 720px) { .panels { grid-template-columns: 1fr 1fr; } }

.panel { background: var(--bg); border: 1px solid var(--borde); border-radius: 10px; padding: .9rem; display: flex; flex-direction: column; }
.panel label { font-weight: 700; font-size: .92rem; margin-bottom: .5rem; color: var(--azul-oscuro); }
@media (prefers-color-scheme: dark) { .panel label { color: var(--blanco); } }

#texto-entrada {
  width: 100%; min-height: 220px; resize: vertical;
  border: 1px solid var(--borde); border-radius: 8px; padding: .7rem;
  font: inherit; font-size: .96rem; line-height: 1.55;
  background: var(--bg); color: var(--texto);
}
#texto-entrada:focus { border-color: var(--morado); }

.salida-texto {
  min-height: 220px; border: 1px dashed var(--borde); border-radius: 8px; padding: .7rem;
  font-size: .96rem; line-height: 1.55; white-space: pre-wrap; overflow-wrap: break-word;
  color: var(--texto);
}
.salida-texto:empty::before { content: "Aquí verás tu texto reformulado."; color: var(--texto-suave); }
.salida-texto[contenteditable="true"] { border-style: solid; border-color: var(--morado); background: var(--morado-suave); }

.panel-footer { display: flex; flex-wrap: wrap; gap: .6rem 1rem; font-size: .8rem; color: var(--texto-suave); margin-top: .55rem; }
.panel-footer strong { color: var(--texto); }

.aviso-limite { margin-top: .5rem; font-size: .85rem; color: var(--alerta); font-weight: 600; }

.opciones { margin-top: 1.1rem; display: grid; gap: .9rem; grid-template-columns: 1fr; }
@media (min-width: 960px) { .opciones { grid-template-columns: 1fr 1fr; } }
.opciones-grupo { border: 1px solid var(--borde); border-radius: 10px; padding: .8rem .9rem; background: var(--bg); }
.opciones-grupo legend { font-weight: 700; font-size: .88rem; padding: 0 .3rem; color: var(--azul-oscuro); }
@media (prefers-color-scheme: dark) { .opciones-grupo legend { color: var(--blanco); } }
.opciones-radios, .opciones-checks { display: flex; flex-direction: column; gap: .45rem; margin-top: .3rem; }
.opciones-radios label, .opciones-checks label { display: flex; align-items: flex-start; gap: .5rem; font-size: .88rem; cursor: pointer; }
.opciones-radios input, .opciones-checks input { margin-top: .2rem; accent-color: var(--morado); flex-shrink: 0; }

.acciones-principales { display: flex; gap: .75rem; margin-top: 1.1rem; flex-wrap: wrap; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .4rem;
  padding: .65rem 1.1rem; border-radius: 999px; font-weight: 700; font-size: .92rem;
  transition: transform .15s var(--ease-out), box-shadow .15s var(--ease-out), background .15s var(--ease-out);
  white-space: nowrap;
}
.btn-primario { background: var(--morado); color: #fff; }
.btn-primario:hover:not(:disabled) { background: var(--morado-oscuro); transform: translateY(-1px); }
.btn-primario:disabled { opacity: .5; cursor: not-allowed; }
.btn-grande { padding: .85rem 1.8rem; font-size: 1.02rem; box-shadow: 0 6px 18px rgba(124, 77, 255, 0.35); }
.btn-secundario { background: var(--bg); border: 1px solid var(--borde); color: var(--texto); }
.btn-secundario:hover { border-color: var(--morado); color: var(--morado-oscuro); }
.btn-terciario { background: transparent; color: var(--morado-oscuro); text-decoration: underline; padding-inline: .3rem; }

.zona-resultado { margin-top: 1.1rem; }
.diferencia-palabras { font-weight: 700; font-size: .9rem; color: var(--azul-oscuro); }
@media (prefers-color-scheme: dark) { .diferencia-palabras { color: var(--blanco); } }
.resumen-cambios { font-size: .88rem; color: var(--texto-suave); margin-top: .25rem; }
.acciones-resultado { display: flex; flex-wrap: wrap; gap: .6rem; margin-top: .8rem; }

/* Estados del tool-card: solo se ocultan controles de resultado si aún no hay resultado */
.tool-card[data-state="idle"] .zona-resultado,
.tool-card[data-state="working"] .zona-resultado { opacity: .35; pointer-events: none; }
.tool-card[data-state="idle"] .diferencia-palabras,
.tool-card[data-state="idle"] .resumen-cambios { display: none; }
.tool-card[data-state="working"] .btn-grande { position: relative; }
.tool-card[data-state="working"] .btn-grande::after {
  content: ""; width: 14px; height: 14px; border-radius: 50%;
  border: 2px solid rgba(255,255,255,.5); border-top-color: #fff;
  animation: girar .7s linear infinite; margin-left: .3rem;
}
@keyframes girar { to { transform: rotate(360deg); } }
.tool-card[data-state="error"] .zona-resultado::before {
  content: "Ocurrió un problema al procesar el texto. Intenta de nuevo."; color: #b91c1c; font-weight: 600; display: block; margin-bottom: .5rem;
}

.panel-comparacion { margin-top: 1.1rem; display: grid; gap: 1rem; grid-template-columns: 1fr; border-top: 1px solid var(--borde); padding-top: 1rem; }
@media (min-width: 720px) { .panel-comparacion { grid-template-columns: 1fr 1fr; } }
.comparacion-col h3 { font-size: .92rem; margin-bottom: .4rem; }
.comparacion-texto { font-size: .9rem; line-height: 1.6; background: var(--bg); border: 1px solid var(--borde); border-radius: 8px; padding: .7rem; white-space: pre-wrap; }
.comparacion-texto del { background: #fde2e2; color: #9b1c1c; text-decoration: line-through; border-radius: 3px; }
.comparacion-texto ins { background: var(--morado-suave); color: var(--morado-oscuro); text-decoration: none; border-radius: 3px; }

.badge-privacidad { text-align: center; margin-top: 1.1rem; font-size: .9rem; color: var(--texto-suave); }
.aviso-uso { max-width: 68ch; margin: .6rem auto 0; text-align: center; font-size: .82rem; color: var(--texto-suave); }

/* =============================================================
   5. Ad slots
   ============================================================= */
.ad-slot {
  margin-block: 2rem; min-height: 90px; border: 1px dashed var(--borde); border-radius: 10px;
  display: flex; align-items: center; justify-content: center; color: var(--texto-suave); font-size: .85rem;
}
.ad-label { text-transform: uppercase; letter-spacing: .06em; font-size: .72rem; font-weight: 700; color: var(--texto-suave); }

.ad-corner {
  position: fixed; right: 1rem; bottom: 1rem; z-index: 50;
  width: min(260px, 80vw); min-height: 100px; background: var(--bg); border: 1px solid var(--borde);
  border-radius: 10px; box-shadow: var(--sombra); padding: .6rem;
  opacity: 0; transform: translateY(12px); pointer-events: none;
  transition: opacity .3s var(--ease-out), transform .3s var(--ease-out);
}
.ad-corner.is-visible { opacity: 1; transform: translateY(0); pointer-events: auto; }
.ad-corner button { position: absolute; top: .3rem; right: .4rem; font-size: 1rem; color: var(--texto-suave); }

.dialog-pdf { border: none; border-radius: var(--radio); padding: 1.4rem; box-shadow: var(--sombra); max-width: 320px; }
.dialog-pdf::backdrop { background: rgba(13,27,62,.5); }
.dialog-pdf h3 { font-size: 1.05rem; margin-bottom: .6rem; }
.dialog-ad-slot { min-height: 80px; border: 1px dashed var(--borde); border-radius: 8px; margin: .6rem 0 1rem; }

/* =============================================================
   6. Secciones de contenido
   ============================================================= */
section.container { padding-block: 1.75rem; }
.section-como-funciona h2, .section-seo h2, .section-herramientas h2, .section-usos h2, .section-faq h2 { text-align: center; margin-bottom: 1.4rem; font-size: clamp(1.3rem, 3vw, 1.7rem); }

.pasos { list-style: none; display: grid; gap: 1.1rem; grid-template-columns: 1fr; }
@media (min-width: 720px) { .pasos { grid-template-columns: repeat(3, 1fr); } }
.pasos li { display: flex; flex-direction: column; gap: .6rem; background: var(--gris-claro); border: 1px solid var(--borde); border-radius: 12px; padding: 1.1rem; }
.pasos svg { color: var(--morado); }
.pasos h3 { font-size: 1rem; margin-bottom: .3rem; }
.pasos p { font-size: .9rem; color: var(--texto-suave); }

.section-seo { max-width: 760px; margin-inline: auto; }
.section-seo p { margin-bottom: 1rem; color: var(--texto-suave); }
.section-seo h2 { text-align: left; max-width: 100%; }

.section-lead { text-align: center; color: var(--texto-suave); margin-bottom: 1.2rem; }
.grid-herramientas { display: grid; grid-template-columns: repeat(2, 1fr); gap: .85rem; }
@media (min-width: 720px) { .grid-herramientas { grid-template-columns: repeat(4, 1fr); } }
.tool-secondary-card {
  display: flex; flex-direction: column; align-items: center; gap: .5rem; text-align: center;
  background: var(--bg); border: 1px solid var(--borde); border-radius: 12px; padding: 1rem .6rem;
  font-size: .85rem; font-weight: 600; transition: border-color .2s var(--ease-out), transform .15s var(--ease-out);
}
.tool-secondary-card:hover { border-color: var(--morado); transform: translateY(-2px); }
.tool-secondary-card svg { color: var(--morado); }

.lista-usos { list-style: none; display: grid; gap: .6rem; grid-template-columns: 1fr; max-width: 640px; margin-inline: auto; }
@media (min-width: 720px) { .lista-usos { grid-template-columns: 1fr 1fr; } }
.lista-usos li { background: var(--gris-claro); border-radius: 8px; padding: .7rem .9rem; font-size: .92rem; border: 1px solid var(--borde); }

.faq-lista { max-width: 720px; margin-inline: auto; display: grid; gap: .6rem; }
.faq-item { background: var(--gris-claro); border: 1px solid var(--borde); border-radius: 10px; padding: .8rem 1rem; }
.faq-item summary { font-weight: 700; cursor: pointer; }
.faq-item p { margin-top: .5rem; color: var(--texto-suave); font-size: .92rem; }

.tarjeta-premium {
  max-width: 640px; margin-inline: auto; text-align: center;
  border: 1px dashed var(--morado); border-radius: var(--radio); padding: 1.4rem; background: var(--morado-suave);
}
.tarjeta-premium h2 { font-size: 1.1rem; }
.tarjeta-premium p { color: var(--texto-suave); margin: .5rem 0 .8rem; font-size: .92rem; }
.tarjeta-premium ul { list-style: none; display: flex; flex-wrap: wrap; justify-content: center; gap: .5rem .8rem; margin-bottom: 1rem; font-size: .85rem; color: var(--texto-suave); }
.tarjeta-premium ul li::before { content: "✓ "; color: var(--morado-oscuro); font-weight: 700; }
.tarjeta-premium a[aria-disabled="true"] { opacity: .6; cursor: default; }

/* =============================================================
   7. Footer
   ============================================================= */
.site-footer { border-top: 1px solid var(--borde); margin-top: 2rem; padding-block: 1.5rem; }
.footer-inner { display: flex; flex-direction: column; gap: .6rem; align-items: center; text-align: center; font-size: .85rem; color: var(--texto-suave); }
.footer-nav { display: flex; gap: 1rem; flex-wrap: wrap; justify-content: center; }
.footer-nav a { text-decoration: underline; }

/* =============================================================
   8. Páginas legales simples
   ============================================================= */
.legal-page { max-width: 760px; margin: 2.5rem auto; padding-inline: 1.25rem; }
.legal-page h1 { margin-bottom: 1rem; }
.legal-page h2 { margin-top: 1.5rem; margin-bottom: .5rem; font-size: 1.1rem; }
.legal-page p, .legal-page li { color: var(--texto-suave); margin-bottom: .6rem; }
.legal-page a.volver { display: inline-block; margin-bottom: 1.5rem; color: var(--morado-oscuro); font-weight: 600; }