:root {
  --bg: #f8fafc;
  --panel: #ffffff;
  --ink: #1f2937;
  --muted: #4b5563;
  --accent: #2f7cf6;
  --radius: 14px;
  --shadow: 0 6px 18px rgba(0, 0, 0, 0.05);
  --font: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

/* RESET Y BASE */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
html, body {
  height: 100%;
}
body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: 1rem;
  line-height: 1.6;
}

.screen {
  max-width: 800px;
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* HEADER */
header {
  text-align: center;
  margin-top: 1rem;
}

.btn-back {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  text-decoration: none;
  padding: 0.6rem 1.2rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  font-weight: 600;
  transition: background 0.2s ease;
}
.btn-back:hover {
  background: #1e5ec4;
}

/* SECCIÓN FAQ */
.faq {
  background: var(--panel);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.5rem 1.75rem;
}

.faq h1 {
  color: var(--accent);
  font-size: 1.6rem;
  margin-bottom: 1rem;
  text-align: center;
}

.faq ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.faq li {
  background: #f9fafb;
  border-left: 4px solid var(--accent);
  border-radius: 8px;
  padding: 1rem;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.03);
}

.faq li strong {
  display: block;
  color: var(--ink);
  font-size: 1rem;
  margin-bottom: 0.25rem;
}

.faq li br + * {
  color: var(--muted);
  font-size: 0.95rem;
}

/* FOOTER */
footer {
  text-align: center;
  color: var(--muted);
  font-size: 0.9rem;
  padding: 0.5rem 0 1rem;
}

/* ===============================
   RESPONSIVE DESIGN
   =============================== */
@media (min-width: 640px) {
  .faq h1 {
    font-size: 1.8rem;
  }

  .faq li {
    padding: 1.25rem 1.5rem;
  }

  .btn-back {
    padding: 0.7rem 1.4rem;
  }
}

@media (min-width: 1024px) {
  body {
    padding: 2rem;
  }

  .faq {
    padding: 2rem 2.5rem;
  }

  .faq h1 {
    font-size: 2rem;
  }
}