/* style.css — Generador de Firmas de Email
 * Interfaz oscura estilo portafolio, con dos columnas: formulario y vista
 * previa. Botones grandes, textos legibles y buen contraste. Sin CDNs.
 */

:root {
  --color-fondo: #0f172a;
  --color-fondo2: #0b1222;
  --color-tarjeta: #1e293b;
  --color-panel: #223049;
  --color-texto: #e2e8f0;
  --color-acento: #38bdf8;
  --color-acento-fuerte: #0ea5e9;
  --color-tenue: #94a3b8;
  --color-borde: #334155;
  --color-ok: #4ade80;
  --color-error: #f87171;
  --radio: 14px;
}

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

body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: linear-gradient(160deg, var(--color-fondo), var(--color-fondo2));
  color: var(--color-texto);
  min-height: 100vh;
  padding: 28px 20px;
  line-height: 1.5;
}

#app {
  background: var(--color-tarjeta);
  border-radius: var(--radio);
  padding: 32px;
  max-width: 1040px;
  margin: 0 auto;
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.45);
}

.cabecera {
  text-align: center;
  margin-bottom: 26px;
}

h1 {
  color: var(--color-acento);
  font-size: 1.9rem;
  margin-bottom: 10px;
}

.subtitulo {
  color: var(--color-tenue);
  font-size: 1rem;
  max-width: 640px;
  margin: 0 auto;
}

.contenido {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 22px;
}

@media (max-width: 780px) {
  .contenido {
    grid-template-columns: 1fr;
  }
}

.panel {
  background: var(--color-panel);
  border: 1px solid var(--color-borde);
  border-radius: var(--radio);
  padding: 22px;
}

.panel h2 {
  font-size: 1.2rem;
  margin-bottom: 14px;
  color: var(--color-texto);
}

/* --- Formulario --- */
label {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  margin: 14px 0 6px;
  color: var(--color-texto);
}

label:first-of-type {
  margin-top: 0;
}

.obligatorio {
  color: var(--color-acento);
}

.opcional {
  color: var(--color-tenue);
  font-weight: 400;
  font-size: 0.82rem;
}

input[type="text"],
input[type="email"] {
  width: 100%;
  padding: 11px 13px;
  font-size: 0.95rem;
  background: #0f1a2e;
  border: 1px solid var(--color-borde);
  border-radius: 9px;
  color: var(--color-texto);
}

input[type="text"]:focus,
input[type="email"]:focus {
  outline: none;
  border-color: var(--color-acento);
  box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.2);
}

input::placeholder {
  color: #64748b;
}

input[type="color"] {
  width: 64px;
  height: 40px;
  padding: 2px;
  background: #0f1a2e;
  border: 1px solid var(--color-borde);
  border-radius: 9px;
  cursor: pointer;
}

/* --- Botones --- */
.acciones {
  margin-top: 20px;
}

.acciones-preview {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.btn {
  font-size: 1rem;
  font-weight: 700;
  padding: 13px 20px;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  transition: transform 0.05s ease, filter 0.15s ease;
}

.btn:active {
  transform: translateY(1px);
}

.btn-principal {
  width: 100%;
  background: linear-gradient(135deg, var(--color-acento), var(--color-acento-fuerte));
  color: #06263a;
}

.btn-principal:hover {
  filter: brightness(1.08);
}

.btn-secundario {
  flex: 1;
  min-width: 140px;
  background: #334155;
  color: var(--color-texto);
  border: 1px solid var(--color-borde);
}

.btn-secundario:hover:not(:disabled) {
  filter: brightness(1.15);
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

/* --- Vista previa (simula un correo) --- */
.ayuda {
  color: var(--color-tenue);
  font-size: 0.88rem;
  margin-bottom: 10px;
}

.vista-previa {
  background: #ffffff;
  color: #1a1a1a;
  border-radius: 10px;
  padding: 22px;
  min-height: 150px;
  max-width: 100%;
  overflow-x: auto;
  border: 1px solid #cbd5e1;
}

.vista-previa .vacio {
  color: #64748b;
  font-size: 0.92rem;
}

/* --- Mensajes --- */
.mensaje-error {
  color: var(--color-error);
  font-size: 0.9rem;
  margin-top: 10px;
  min-height: 1.2em;
}

.mensaje-ok {
  color: var(--color-ok);
  font-size: 0.9rem;
  margin-top: 12px;
  min-height: 1.2em;
}

/* --- Pie --- */
.pie {
  text-align: center;
  color: var(--color-tenue);
  font-size: 0.82rem;
  margin-top: 26px;
}