:root {
  --fondo: #fafaf9;
  --superficie: #ffffff;
  --borde: #e7e5e4;
  --texto: #1c1917;
  --texto-suave: #78716c;
  --acento: #0d9488;
  --acento-fuerte: #0f766e;
  --aviso: #d97706;
  --alerta: #dc2626;
  --tinta-oscura: #111827;
  --sombra-1: 0 1px 2px rgba(28, 25, 23, .05);
  --sombra-2: 0 4px 12px rgba(28, 25, 23, .07), 0 12px 32px rgba(28, 25, 23, .06);
  --radio: 12px;
  --transicion: 200ms cubic-bezier(.4, 0, .2, 1);
}

@media (prefers-color-scheme: dark) {
  :root {
    --fondo: #141210;
    --superficie: #1e1b19;
    --borde: #322e2b;
    --texto: #f5f5f4;
    --texto-suave: #a8a29e;
    --acento: #5eead4;
    --acento-fuerte: #2dd4bf;
    --tinta-oscura: #f5f5f4;
    --sombra-1: 0 1px 2px rgba(0, 0, 0, .3);
    --sombra-2: 0 4px 12px rgba(0, 0, 0, .35), 0 12px 32px rgba(0, 0, 0, .3);
  }
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, "Segoe UI", Roboto, Inter, sans-serif;
  background: var(--fondo);
  color: var(--texto);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

.contenedor {
  max-width: 1080px;
  margin-inline: auto;
  padding-inline: 20px;
}

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

/* ---------- Cabecera ---------- */
.cabecera {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(10px);
  background: color-mix(in srgb, var(--fondo) 82%, transparent);
  border-bottom: 1px solid var(--borde);
}

.cabecera__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 58px;
}

.marca {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-weight: 700;
  letter-spacing: -.02em;
  text-decoration: none;
  color: var(--texto);
}

.cabecera nav { display: flex; gap: 22px; }

.cabecera nav a {
  color: var(--texto-suave);
  text-decoration: none;
  font-size: .9rem;
  font-weight: 500;
  transition: color var(--transicion);
}

.cabecera nav a:hover { color: var(--texto); }

@media (max-width: 480px) {
  .cabecera nav a:not(:last-child) { display: none; }
}

/* ---------- Hero ---------- */
.hero {
  text-align: center;
  padding-top: clamp(28px, 5vw, 52px);
  animation: aparecer .5s ease both;
}

.hero__kicker {
  font-size: .75rem;
  font-weight: 600;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--acento);
  margin-bottom: 12px;
}

.hero h1 {
  font-size: clamp(2rem, 6vw, 3.4rem);
  line-height: 1.08;
  letter-spacing: -.035em;
  font-weight: 800;
}

.hero__sub {
  max-width: 560px;
  margin: 14px auto 0;
  color: var(--texto-suave);
  font-size: 1.05rem;
}

/* ---------- Tool ---------- */
.tool-zone {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 18px;
  align-items: stretch;
  margin-top: clamp(24px, 4vw, 40px);
  animation: aparecer-sube .55s ease .1s both;
}

@media (max-width: 900px) {
  .tool-zone { grid-template-columns: 1fr; }
}

.editor {
  background: var(--superficie);
  border: 1px solid var(--borde);
  border-radius: var(--radio);
  box-shadow: var(--sombra-2);
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  min-width: 0;
}

.editor__label {
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--texto-suave);
}

.editor__area {
  width: 100%;
  min-height: clamp(140px, 26vh, 220px);
  resize: vertical;
  border: 1px solid var(--borde);
  border-radius: 10px;
  background: transparent;
  color: inherit;
  font: 1rem/1.6 ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  padding: 14px;
  outline: none;
  transition: border-color var(--transicion), box-shadow var(--transicion);
}

.editor__area::placeholder { color: var(--texto-suave); opacity: .7; }

.editor__area:focus {
  border-color: var(--acento);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--acento) 18%, transparent);
}

/* ---------- Límite + progreso ---------- */
.limite__head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  justify-content: space-between;
}

.limite__titulo {
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--texto-suave);
}

.chips { display: flex; flex-wrap: wrap; gap: 8px; }

.chip {
  font: inherit;
  font-size: .78rem;
  font-weight: 600;
  padding: 7px 12px;
  min-height: 32px;
  border-radius: 999px;
  border: 1px solid var(--borde);
  background: transparent;
  color: var(--texto-suave);
  cursor: pointer;
  transition: all var(--transicion);
}

.chip:hover { border-color: var(--acento); color: var(--texto); }

.chip--activo {
  background: var(--tinta-oscura);
  border-color: var(--tinta-oscura);
  color: var(--acento);
}

.progreso {
  height: 8px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--texto-suave) 18%, transparent);
  overflow: hidden;
}

.progreso--activa .progreso__relleno { transition: width 250ms ease; }

.progreso__relleno {
  height: 100%;
  width: 0;
  border-radius: inherit;
  background: var(--acento);
}

.progreso[data-nivel="aviso"] .progreso__relleno { background: var(--aviso); }
.progreso[data-nivel="alerta"] .progreso__relleno { background: #f59e0b; }
.progreso[data-nivel="excedido"] .progreso__relleno { background: var(--alerta); }

.limite__info {
  font-size: .85rem;
  color: var(--texto-suave);
  min-height: 1.3em;
}

/* ---------- Acciones ---------- */
.acciones {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font: inherit;
  font-size: .88rem;
  font-weight: 600;
  padding: 11px 16px;
  min-height: 44px;
  border-radius: 10px;
  border: 1px solid var(--borde);
  background: var(--superficie);
  color: var(--texto);
  cursor: pointer;
  transition: all var(--transicion);
}

.btn:hover { border-color: var(--acento); transform: translateY(-1px); box-shadow: var(--sombra-1); }
.btn:active { transform: translateY(0); }

.btn--primario {
  background: var(--tinta-oscura);
  border-color: var(--tinta-oscura);
  color: var(--acento);
}

.btn--primario:hover { opacity: .92; }

.btn--peligro:hover { border-color: var(--alerta); color: var(--alerta); }

.btn:focus-visible,
.chip:focus-visible,
.editor__area:focus-visible {
  outline: 2px solid var(--acento);
  outline-offset: 2px;
}

.toast {
  font-size: .85rem;
  font-weight: 600;
  color: var(--acento-fuerte);
  min-height: 1.4em;
  opacity: 0;
  transition: opacity var(--transicion);
}

.toast--visible { opacity: 1; }

/* ---------- Métricas ---------- */
.metricas {
  display: flex;
  flex-direction: column;
  gap: 12px;
  animation: aparecer-sube .55s ease .18s both;
}

.metrica {
  background: var(--superficie);
  border: 1px solid var(--borde);
  border-radius: var(--radio);
  box-shadow: var(--sombra-1);
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.metrica--destacada {
  background: var(--tinta-oscura);
  border-color: var(--tinta-oscura);
  align-items: center;
  text-align: center;
  padding: 20px 16px;
}

.metrica__valor {
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -.02em;
  font-variant-numeric: tabular-nums;
}

.metrica--destacada .metrica__valor {
  font-size: clamp(2.2rem, 5vw, 2.8rem);
  line-height: 1.05;
  color: var(--acento);
}

.metrica__nombre {
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--texto-suave);
}

.metrica--destacada .metrica__nombre { color: color-mix(in srgb, var(--acento) 70%, white); }

.metrica-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  flex: 1;
}

@media (max-width: 900px) {
  .metrica-grid { grid-template-columns: repeat(4, 1fr); }
}
@media (max-width: 560px) {
  .metrica-grid { grid-template-columns: repeat(2, 1fr); }
}

/* ---------- Contenido ---------- */
.seccion { padding-block: clamp(30px, 5vw, 54px); }

.seccion h2 {
  font-size: clamp(1.5rem, 3.4vw, 2rem);
  letter-spacing: -.025em;
  font-weight: 800;
  margin-bottom: 16px;
}

.seccion h3 { letter-spacing: -.01em; font-weight: 700; margin-bottom: 6px; }

.seccion p { color: var(--texto-suave); max-width: 68ch; }
.seccion strong { color: var(--texto); }

.pasos {
  list-style: none;
  counter-reset: paso;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
}

.pasos li {
  counter-increment: paso;
  background: var(--superficie);
  border: 1px solid var(--borde);
  border-radius: var(--radio);
  box-shadow: var(--sombra-1);
  padding: 18px;
  transition: transform var(--transicion), box-shadow var(--transicion);
}

.pasos li:hover { transform: translateY(-2px); box-shadow: var(--sombra-2); }

.pasos li::before {
  content: counter(paso, decimal-leading-zero);
  display: block;
  font-size: .78rem;
  font-weight: 800;
  color: var(--acento);
  letter-spacing: .1em;
  margin-bottom: 8px;
}

.pasos p { font-size: .92rem; }

.tarjetas {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 14px;
}

.tarjeta {
  background: var(--superficie);
  border: 1px solid var(--borde);
  border-radius: var(--radio);
  box-shadow: var(--sombra-1);
  padding: 18px;
  border-top: 3px solid var(--acento);
}

.tarjeta p { font-size: .92rem; margin-top: 4px; }

.consejo-titulo { margin-top: 26px; font-size: 1.15rem; }

.consejos {
  margin-top: 10px;
  padding-left: 20px;
  color: var(--texto-suave);
  max-width: 68ch;
}

.consejos li + li { margin-top: 6px; }

/* FAQ */
#faq details {
  background: var(--superficie);
  border: 1px solid var(--borde);
  border-radius: 10px;
  box-shadow: var(--sombra-1);
  padding: 0 18px;
}

#faq details + details { margin-top: 10px; }

#faq summary {
  cursor: pointer;
  font-weight: 700;
  padding: 15px 0;
  list-style: none;
  position: relative;
  padding-right: 28px;
}

#faq summary::-webkit-details-marker { display: none; }

#faq summary::after {
  content: "+";
  position: absolute;
  right: 4px;
  top: 50%;
  translate: 0 -50%;
  font-size: 1.25rem;
  font-weight: 400;
  color: var(--acento);
  transition: rotate var(--transicion);
}

#faq details[open] summary::after { rotate: 45deg; }

#faq details p { padding-bottom: 15px; font-size: .95rem; }

/* CTA */
.cta {
  text-align: center;
  background: var(--tinta-oscura);
  border-radius: calc(var(--radio) * 1.4);
  padding: clamp(28px, 5vw, 48px) 24px;
  margin-bottom: clamp(30px, 5vw, 54px);
}

.cta p { color: color-mix(in srgb, var(--acento) 60%, white); max-width: 46ch; margin: 0 auto 18px; }

/* Ad slots */
.ad-slot {
  min-height: 90px;
  border: 1px dashed var(--borde);
  border-radius: var(--radio);
  margin-block: 8px;
}

/* Footer */
.pie {
  border-top: 1px solid var(--borde);
  padding-block: 26px;
}

.pie__inner {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  justify-content: space-between;
  color: var(--texto-suave);
  font-size: .9rem;
}

.pie nav { display: flex; flex-wrap: wrap; gap: 16px; }

.pie a { color: inherit; text-decoration: none; transition: color var(--transicion); }
.pie a:hover { color: var(--acento); }

/* Animaciones */
@keyframes aparecer {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes aparecer-sube {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}