header {
  background: var(--azul);
  color: white;
  padding: 18px 32px;
  display: flex;
  align-items: center;
  gap: 16px;
  box-shadow: 0 2px 12px rgba(0,0,0,0.18);
}

header .logo-box {
  background: white;
  border-radius: 6px;
  padding: 6px 12px;
  font-size: 13px;
  font-weight: 700;
  color: var(--azul);
  letter-spacing: 0.5px;
}

header h1 { font-size: 20px; font-weight: 600; letter-spacing: 0.3px; }
header p { font-size: 13px; opacity: 0.75; margin-top: 2px; }

.header-title {
  min-width: 0;
}

.container {
  max-width: 1100px;
  margin: 32px auto;
  padding: 0 20px;
  display: grid;
  gap: 24px;
}

.container.wide { max-width: 1200px; }
.container.xwide { max-width: 1400px; }

.footer, footer {
  text-align: center;
  margin-top: 40px;
  padding: 24px 12px 30px;
  font-size: 12px;
  color: #888;
}

.footer-autor {
  margin-top: 6px;
  font-size: 11px;
  color: #a0a0a0;
  letter-spacing: 0.3px;
}

.btn-volver {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(255,255,255,0.15);
  color: white;
  border: 1px solid rgba(255,255,255,0.3);
  border-radius: 6px;
  padding: 7px 14px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  margin-left: auto;
  transition: background 0.2s;
}
.btn-volver:hover { background: rgba(255,255,255,0.28); }

.nav-button,
.btn-volver,
.btn-volver-header,
.btn-h {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-height: 36px;
  white-space: nowrap;
}

.btn-volver-header {
  margin-left: auto;
}

@media (max-width: 700px) {
  header { flex-direction: column; align-items: flex-start; gap: 12px; }
  .container { padding: 0 14px; margin: 24px auto; }
  .nav-button,
  .btn-volver,
  .btn-volver-header,
  .btn-h {
    width: 100%;
    margin-left: 0;
  }
}