:root {
  --negro: #070e13;
  --azul-petroleo: #0d222b;
  --azul-petroleo-claro: #16323d;
  --papel: #e9e2d3;
  --papel-tenue: #cabf9f;
  --rojo: #a6332b;
  --rojo-vivo: #c94a3f;
  --borde: rgba(233, 226, 211, 0.14);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  min-height: 100%;
  background: var(--negro);
  color: var(--papel);
  font-family: 'Vollkorn', Georgia, 'Times New Roman', serif;
  line-height: 1.55;
}

.fondo-agua {
  position: fixed;
  inset: 0;
  z-index: 0;
  background:
    radial-gradient(1200px 600px at 20% -10%, rgba(22, 50, 61, 0.55), transparent 60%),
    radial-gradient(900px 500px at 90% 110%, rgba(22, 50, 61, 0.45), transparent 60%),
    repeating-linear-gradient(115deg, rgba(233, 226, 211, 0.015) 0px, rgba(233, 226, 211, 0.015) 1px, transparent 1px, transparent 5px),
    linear-gradient(180deg, var(--negro), var(--azul-petroleo) 55%, var(--negro));
  pointer-events: none;
}

.expediente {
  position: relative;
  z-index: 1;
  max-width: 620px;
  margin: 0 auto;
  padding: 56px 24px 40px;
  transition: max-width 0.4s ease;
}
/* Al revelar la solución se ensancha para que la tabla y las listas respiren */
.expediente--resuelto { max-width: 760px; }

.cabecera { text-align: center; margin-bottom: 28px; }

.kicker {
  font-family: 'Special Elite', 'Courier New', monospace;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--papel-tenue);
  margin: 0 0 10px;
  text-transform: uppercase;
}

h1 {
  font-family: 'Playfair Display', Georgia, serif;
  font-weight: 900;
  font-size: clamp(30px, 6vw, 44px);
  letter-spacing: 0.03em;
  margin: 0 0 6px;
  color: var(--papel);
  text-shadow: 0 2px 18px rgba(0,0,0,0.5);
}

.subtitulo {
  font-family: 'Playfair Display', Georgia, serif;
  font-style: italic;
  font-size: 18px;
  color: var(--rojo-vivo);
  margin: 0 0 18px;
}

.intro {
  font-size: 15px;
  color: var(--papel-tenue);
  max-width: 480px;
  margin: 0 auto;
}
.intro em { color: var(--papel); font-style: italic; }

.sello {
  font-family: 'Special Elite', monospace;
  color: var(--rojo);
  border: 3px solid var(--rojo);
  border-radius: 6px;
  display: inline-block;
  padding: 6px 16px;
  font-size: 13px;
  letter-spacing: 0.22em;
  transform: rotate(-7deg);
  opacity: 0.85;
  margin: 0 auto 22px;
  display: table;
  mix-blend-mode: screen;
}

.carpeta {
  background: linear-gradient(180deg, rgba(22,50,61,0.55), rgba(7,14,19,0.75));
  border: 1px solid var(--borde);
  border-left: 4px solid var(--rojo);
  border-radius: 4px;
  padding: 32px 28px;
  box-shadow: 0 30px 60px rgba(0,0,0,0.45), inset 0 1px 0 rgba(255,255,255,0.03);
}

/* Cada paso "entra" como si fuera una pantalla nueva: solo se anima al pasar
   de display:none a visible (no se repite mientras el paso ya está a la vista). */
.paso, .carpeta-solucion {
  animation: entrada-paso 0.45s ease;
}
@keyframes entrada-paso {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.paso-indicador {
  font-family: 'Special Elite', 'Courier New', monospace;
  font-size: 10.5px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--rojo-vivo);
  margin: 0 0 12px;
}

.paso label {
  display: block;
  font-family: 'Special Elite', 'Courier New', monospace;
  font-size: 13px;
  letter-spacing: 0.03em;
  color: var(--papel-tenue);
  margin-bottom: 10px;
}

.paso form {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

input[type="email"], input[type="text"] {
  flex: 1 1 220px;
  background: rgba(7,14,19,0.6);
  border: 1px solid var(--borde);
  border-radius: 3px;
  padding: 13px 14px;
  color: var(--papel);
  font-family: 'Vollkorn', Georgia, serif;
  font-size: 16px;
}
input::placeholder { color: rgba(233,226,211,0.35); }
input:focus { outline: none; border-color: var(--rojo-vivo); background: rgba(7,14,19,0.85); }

.trampa {
  position: absolute !important;
  left: -9999px !important;
  width: 1px; height: 1px; opacity: 0;
}

button[type="submit"] {
  background: var(--rojo);
  color: var(--papel);
  border: none;
  border-radius: 3px;
  padding: 13px 22px;
  font-family: 'Special Elite', monospace;
  font-size: 13px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  cursor: pointer;
  transition: background 0.15s ease, transform 0.1s ease;
}
button[type="submit"]:hover { background: var(--rojo-vivo); }
button[type="submit"]:active { transform: scale(0.98); }
button[type="submit"]:disabled { opacity: 0.4; cursor: not-allowed; }

.intentos {
  margin: 14px 0 0;
  font-family: 'Special Elite', monospace;
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--papel-tenue);
}

.oculto { display: none !important; }

.mensaje {
  margin-top: 20px;
  padding: 16px 18px;
  border-radius: 3px;
  font-size: 15px;
  border-left: 3px solid transparent;
}
.mensaje.ok {
  background: rgba(58, 110, 60, 0.18);
  border-color: #4c9a4f;
  color: #cfe9cf;
}
.mensaje.error {
  background: rgba(166, 51, 43, 0.18);
  border-color: var(--rojo);
  color: #f3d3cf;
}
.mensaje.info {
  background: rgba(22, 50, 61, 0.55);
  border-color: var(--papel-tenue);
  color: var(--papel);
}

.pie {
  text-align: center;
  margin-top: 34px;
  font-size: 12.5px;
  color: rgba(233,226,211,0.4);
}

/* ---------- Paso 3: revelación de la solución ---------- */

.carpeta-solucion { margin-top: 24px; }

.solucion { font-size: 15.5px; }

.solucion-kicker {
  font-family: 'Special Elite', 'Courier New', monospace;
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--papel-tenue);
  margin: 0 0 8px;
}

.solucion-titulo {
  font-family: 'Playfair Display', Georgia, serif;
  font-weight: 900;
  font-size: clamp(22px, 4vw, 30px);
  color: var(--papel);
  margin: 0 0 12px;
  text-shadow: 0 2px 14px rgba(0,0,0,0.5);
}

.solucion-ficha {
  background: rgba(166, 51, 43, 0.14);
  border-left: 3px solid var(--rojo);
  padding: 12px 16px;
  margin: 0 0 20px;
  color: var(--papel-tenue);
  font-size: 14.5px;
}

.solucion h3 {
  font-family: 'Playfair Display', Georgia, serif;
  font-size: 18px;
  color: var(--papel);
  border-bottom: 1px solid var(--borde);
  padding-bottom: 8px;
  margin: 30px 0 14px;
}

.solucion p { margin: 0 0 14px; color: var(--papel); }

.solucion-pistas {
  list-style: none;
  counter-reset: pista;
  padding: 0;
  margin: 0 0 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.solucion-pistas li {
  counter-increment: pista;
  padding: 8px 12px 8px 40px;
  position: relative;
  background: rgba(22,50,61,0.4);
  border-radius: 3px;
  font-size: 14px;
}
.solucion-pistas li::before {
  content: counter(pista);
  position: absolute;
  left: 10px;
  top: 8px;
  font-family: 'Special Elite', monospace;
  color: var(--rojo-vivo);
  font-size: 12px;
}
.solucion-pistas li::after {
  content: '✓';
  position: absolute;
  right: 12px;
  top: 8px;
  color: #6fae72;
  font-weight: bold;
}

.solucion-embudo {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
  margin: 0 0 20px;
}
.solucion-embudo th, .solucion-embudo td {
  text-align: left;
  padding: 7px 10px;
  border-bottom: 1px solid var(--borde);
}
.solucion-embudo th {
  font-family: 'Special Elite', monospace;
  font-size: 10.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--papel-tenue);
}
.solucion-embudo td:nth-child(2), .solucion-embudo td:nth-child(3),
.solucion-embudo th:nth-child(2), .solucion-embudo th:nth-child(3) { text-align: right; }

.solucion-senuelos {
  padding-left: 18px;
  margin: 0 0 16px;
  font-size: 14px;
  color: var(--papel-tenue);
}
.solucion-senuelos li { margin-bottom: 8px; }
.solucion-senuelos strong { color: var(--papel); }

.solucion-enfasis {
  font-family: 'Playfair Display', Georgia, serif;
  font-style: italic;
  font-size: 18px;
  color: var(--rojo-vivo);
  text-align: center;
  margin: 8px 0 24px;
}

.solucion-aviso-email {
  margin-top: 26px;
  background: rgba(58, 110, 60, 0.14);
  border-left: 3px solid #4c9a4f;
  padding: 14px 16px;
  border-radius: 3px;
  font-size: 14.5px;
  color: #cfe9cf;
}
.solucion-aviso-email strong { color: var(--papel); }

@media (max-width: 480px) {
  .expediente { padding: 40px 16px 30px; }
  .carpeta { padding: 24px 18px; }
  .paso form { flex-direction: column; }
  button[type="submit"] { width: 100%; }
  .solucion-pistas li { font-size: 13px; }
  .solucion-embudo { font-size: 11.5px; }
}