body {
  font-family: 'Segoe UI', Arial, sans-serif;
  transition: background 0.3s, color 0.3s;
}

[data-bs-theme="dark"] {
  background: #181a1b;
  color: #f1f1f1;
}

.navbar {
  border-bottom: 1px solid #e5e5e5;
}

.navbar[data-bs-theme="dark"] {
  background: #23272b !important;
  border-bottom: 1px solid #222;
}

.card, .accordion-item {
  border-radius: 1rem;
}

.btn-warning {
  color: #222;
}

footer {
  font-size: 0.95em;
}

#previewCard .preview-modern-card {
  max-width: 540px;
  margin: 0 auto;
  border-radius: 18px;
  box-shadow: 0 6px 24px rgba(0,0,0,0.08), 0 1.5px 4px rgba(0,0,0,0.08);
  background: #fff;
  overflow: hidden;
}

.preview-thumbnail {
  border-radius: 12px;
  border: 2px solid #f0f0f0;
  box-shadow: 0 2px 8px rgba(0,0,0,0.04);
  max-width: 120px;
  width: 100%;
  height: auto;
}

.preview-download-btn {
  font-size: 1.1rem;
  font-weight: 600;
  transition: background 0.18s, box-shadow 0.18s;
  box-shadow: 0 2px 8px rgba(40,167,69,0.08);
}
.preview-download-btn:hover, .preview-download-btn:focus {
  background: #218838;
  box-shadow: 0 4px 16px rgba(40,167,69,0.15);
}

#previewCard .card-title {
  font-size: 1.3rem;
  color: #007bff;
  margin-bottom: 0.5rem;
}

#previewCard .card-text small {
  color: #6c757d;
}

@media (max-width: 768px) {
  #previewCard .preview-modern-card {
    max-width: 98vw;
    border-radius: 12px;
  }
  .preview-thumbnail {
    max-width: 90px;
    border-radius: 8px;
  }
  #previewCard .card-title {
    font-size: 1.1rem;
  }
  .preview-download-btn {
    font-size: 1rem;
    padding: 0.65rem 1rem;
  }
}


/* Responsive tweaks */
@media (max-width: 768px) {
  .display-4 {
    font-size: 2.2rem;
  }
}