:root {
  --azul: #2563eb;
  --azul-oscuro: #1d4ed8;
  --slate-950: #0f172a;
  --slate-900: #0f172a;
  --slate-600: #475569;
  --slate-400: #94a3b8;
  --slate-200: #e2e8f0;
  --slate-100: #f1f5f9;
  --slate-50: #f8fafc;
  --borde: hsl(220 13% 91%);
  --superficie: hsl(0 0% 100% / 0.85);
  --sombra: 0 1px 2px hsl(220 13% 20% / 0.04), 0 8px 24px hsl(220 13% 20% / 0.06);
  --radio: 1rem;
}

:root[data-theme="dark"], html.dark {
  --slate-950: #f8fafc;
  --slate-600: #cbd5e1;
  --slate-400: #64748b;
  --borde: hsl(217 33% 18%);
  --superficie: hsl(222 47% 11% / 0.85);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --slate-950: #f8fafc;
    --slate-600: #cbd5e1;
    --slate-400: #64748b;
    --borde: hsl(217 33% 18%);
    --superficie: hsl(222 47% 11% / 0.85);
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  min-height: 100%;
}

body {
  font-family: Manrope, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color: var(--slate-950);
  background: var(--slate-50);
  background-image: radial-gradient(circle at 20% -10%, hsl(217 91% 60% / 0.12), transparent 45%),
    radial-gradient(circle at 90% 0%, hsl(217 91% 60% / 0.08), transparent 40%);
}

@media (prefers-color-scheme: dark) {
  body:not([data-force-light]) { background: #0b1220; }
}
:root[data-theme="dark"] body, html.dark body { background: #0b1220; }

header.lcp-shell {
  position: sticky;
  top: 0;
  left: 0;
  right: 0;
  height: 64px;
  display: flex;
  align-items: center;
  padding: 0 1.5rem;
  background: var(--superficie);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--borde);
  z-index: 50;
}

.wordmark {
  font-family: Sora, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--slate-950);
}

.wordmark span { color: var(--azul); }

main {
  max-width: 480px;
  margin: 0 auto;
  padding: 4.5rem 1.25rem 3rem;
}

h1 {
  font-family: Sora, system-ui, sans-serif;
  font-size: 1.75rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin: 0 0 0.5rem;
}

p.subtitulo {
  color: var(--slate-600);
  margin: 0 0 2rem;
  line-height: 1.5;
}

.card {
  background: var(--superficie);
  border: 1px solid var(--borde);
  border-radius: var(--radio);
  padding: 1.75rem;
  box-shadow: var(--sombra);
}

label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

input[type="text"] {
  width: 100%;
  font-family: inherit;
  font-size: 1rem;
  padding: 0.75rem 1rem;
  border-radius: 0.65rem;
  border: 1px solid var(--slate-200);
  background: var(--slate-50);
  color: var(--slate-950);
  outline: none;
  transition: border-color 0.15s, box-shadow 0.15s;
}

input[type="text"]:focus {
  border-color: var(--azul);
  box-shadow: 0 0 0 3px hsl(217 91% 60% / 0.15);
}

button {
  width: 100%;
  margin-top: 1rem;
  font-family: Sora, inherit;
  font-size: 0.95rem;
  font-weight: 700;
  color: white;
  background: var(--azul);
  border: none;
  border-radius: 0.65rem;
  padding: 0.8rem 1rem;
  cursor: pointer;
  transition: background 0.15s, transform 0.1s;
}

button:hover { background: var(--azul-oscuro); }
button:active { transform: translateY(1px); }
button:disabled { opacity: 0.6; cursor: not-allowed; }

.resultado {
  margin-top: 1.5rem;
  border-radius: 0.75rem;
  padding: 1rem 1.1rem;
  font-size: 0.9rem;
  line-height: 1.5;
  display: none;
}

.resultado.visible { display: block; }

.resultado.ok {
  background: hsl(142 71% 45% / 0.1);
  border: 1px solid hsl(142 71% 45% / 0.3);
  color: hsl(142 60% 24%);
}

.resultado.error {
  background: hsl(0 84% 60% / 0.08);
  border: 1px solid hsl(0 84% 60% / 0.3);
  color: hsl(0 70% 40%);
}

.resultado dl {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.25rem 0.75rem;
  margin: 0;
}

.resultado dt { font-weight: 600; opacity: 0.75; }
.resultado dd { margin: 0; }

footer {
  text-align: center;
  font-size: 0.75rem;
  color: var(--slate-400);
  margin-top: 2rem;
}