/* ═══════════════════════════════════════════
   NAVIGATION BUTTONS
═══════════════════════════════════════════ */
.nav-buttons {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-light);
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 0.75rem 1.8rem;
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: var(--radius);
  border: none;
  cursor: pointer;
  transition: all var(--transition);
  font-family: var(--font);
}
.btn-next {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  box-shadow: 0 4px 16px rgba(212,119,44,0.25);
}
.btn-next:hover { transform: translateY(-2px); box-shadow: 0 6px 24px rgba(212,119,44,0.35); }
.btn-prev {
  background: transparent;
  border: 1.5px solid var(--border);
  color: var(--text-secondary);
}
.btn-prev:hover { border-color: var(--text); color: var(--text); }
.btn-submit {
  background: linear-gradient(135deg, #2E7D32, #1B5E20);
  color: #fff;
  box-shadow: 0 4px 16px rgba(46,125,50,0.25);
}
.btn-submit:hover:not(:disabled) { transform: translateY(-2px); box-shadow: 0 6px 24px rgba(46,125,50,0.35); }
.btn-submit:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-download {
  background: linear-gradient(135deg, var(--dark), var(--dark-warm));
  color: #fff;
  box-shadow: 0 4px 16px rgba(26,16,24,0.25);
}
.btn-download:hover { transform: translateY(-2px); box-shadow: 0 6px 24px rgba(26,16,24,0.35); }
.btn-download-secondary {
  background: linear-gradient(135deg, #4a3f45, #2b2228);
  opacity: 0.95;
}
.btn-outline {
  background: transparent;
  border: 1.5px solid var(--border);
  color: var(--text-secondary);
}
.btn-outline:hover { border-color: var(--primary); color: var(--primary); }
.btn-spacer { visibility: hidden; }

/* ═══════════════════════════════════════════
   MOBILE RESPONSIVE
═══════════════════════════════════════════ */
@media (max-width: 768px) {
  .nav-buttons {
    gap: 0.8rem;
    margin-top: 1.5rem;
  }

  .btn {
    padding: 0.65rem 1.2rem;
    font-size: 0.85rem;
  }

  .btn-next,
  .btn-prev,
  .btn-submit,
  .btn-download {
    flex: 1;
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .nav-buttons {
    flex-direction: column;
    gap: 0.6rem;
  }

  .btn {
    width: 100%;
    padding: 0.6rem 1rem;
    font-size: 0.8rem;
  }

  .btn-next,
  .btn-prev,
  .btn-submit,
  .btn-download {
    flex: none;
  }
}