:root {
  --primary-color: #818cf8;
  --secondary-color: #9ca3af;
  --background-color: #111827;
  --surface-color: #1f2937;
  --text-color: #d1d5db;
  --border-color: #374151;
  --success-color: #34d399;
  --error-color: #f87171;
  --hover-bg-color: #374151;
}

body { 
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; 
  background-color: var(--background-color); 
  color: var(--text-color); 
  margin: 0; 
  display: flex; 
  flex-direction: column;
  justify-content: center; 
  align-items: center; 
  min-height: 100vh;
  padding: 2rem 0;
}

.app { 
  max-width: 700px; 
  width: 90%; 
  padding: 2rem; 
  background-color: var(--surface-color); 
  border-radius: 12px; 
  border: 1px solid var(--border-color);
  box-shadow: 0 10px 25px rgba(0,0,0,0.3);
}

.app-header { 
  display: flex; 
  align-items: center; 
  justify-content: center; 
  gap: 0.75rem; 
  margin-bottom: 2rem; 
}

.app-header .icon-large { 
  width: 2.5rem; 
  height: 2.5rem; 
  color: var(--primary-color); 
}

h1 { 
  text-align: center; 
  color: var(--primary-color); 
  margin: 0; 
  font-size: 1.75rem;
}

.file-dropzone { 
  border: 2px dashed var(--border-color); 
  border-radius: 8px; 
  padding: 2.5rem; 
  text-align: center; 
  cursor: pointer; 
  transition: background-color 0.2s, border-color 0.2s; 
}

.file-dropzone:hover, .file-dropzone.drag-over { 
  background-color: var(--hover-bg-color); 
  border-color: var(--primary-color); 
}

.dropzone-content .icon-large { 
  width: 4rem; 
  height: 4rem; 
  margin: 0 auto 1rem; 
  color: var(--primary-color); 
}

.dropzone-content p { 
  margin: 0.5rem 0; 
  font-size: 1.1rem; 
}

.dropzone-content .small-text { 
  font-size: 0.9rem; 
  color: var(--secondary-color); 
}

.settings-panel { 
  text-align: center; 
}

.file-preview { 
  background-color: var(--background-color); 
  padding: 1rem; 
  border-radius: 8px; 
  margin-bottom: 1.5rem; 
  border: 1px solid var(--border-color);
}

.file-preview p { 
  color: var(--secondary-color); 
  margin: 0.25rem 0; 
  font-size: 0.9rem; 
}
.file-preview p strong {
  color: var(--text-color);
}

.settings-form { 
  margin: 1.5rem 0; 
  text-align: left; 
  display: inline-block;
}

.settings-form > label { 
  font-weight: bold; 
  color: var(--text-color);
}

.quality-options { 
  display: flex; 
  flex-direction: column; 
  gap: 0.75rem; 
  margin-top: 0.5rem; 
}

.quality-options label { 
  font-weight: normal; 
  display: flex; 
  align-items: center; 
  gap: 0.75rem; 
  cursor: pointer; 
  padding: 0.75rem; 
  border: 1px solid var(--border-color); 
  border-radius: 6px; 
  transition: border-color 0.2s, box-shadow 0.2s, background-color 0.2s; 
}
.quality-options label:hover {
  background-color: var(--hover-bg-color);
}

.quality-options label:has(input:checked) { 
  border-color: var(--primary-color); 
  box-shadow: 0 0 0 2px #535a9b; 
  background-color: var(--hover-bg-color);
}

.action-buttons { 
  display: flex; 
  justify-content: center; 
  gap: 1rem; 
  margin-top: 1.5rem; 
}

.button-primary, .button-secondary { 
  border: none; 
  padding: 0.75rem 1.5rem; 
  border-radius: 6px; 
  font-size: 1rem; 
  cursor: pointer; 
  transition: background-color 0.2s, transform 0.1s; 
  font-weight: bold; 
}
.button-primary:active, .button-secondary:active {
  transform: scale(0.98);
}

.button-primary { 
  background-color: var(--primary-color); 
  color: #111827; 
}

.button-primary:hover { 
  background-color: #6a73e0; 
}

.button-secondary { 
  background-color: var(--border-color); 
  color: var(--text-color); 
}

.button-secondary:hover { 
  background-color: #4b5563; 
}

.processing-view { 
  text-align: center; 
  padding: 2rem; 
}

.processing-view h2 { 
  margin: 1.5rem 0; 
  color: var(--text-color);
}

.processing-view .spinner { 
  animation: spin 1s linear infinite; 
}

@keyframes spin { 
  from { transform: rotate(0deg); } 
  to { transform: rotate(360deg); } 
}

.progress-bar { 
  width: 100%; 
  background-color: var(--background-color); 
  border-radius: 8px; 
  overflow: hidden; 
  height: 1.5rem; 
  margin: 1rem 0; 
  border: 1px solid var(--border-color);
}

.progress-bar-inner { 
  height: 100%; 
  width: 0; 
  background-color: var(--primary-color); 
  border-radius: 8px; 
  transition: width 0.5s ease-out; 
}

.result-view { 
  text-align: center; 
}

.result-view .success-icon { 
  color: var(--success-color); 
}

.result-stats { 
  display: grid; 
  grid-template-columns: 1fr 1fr; 
  gap: 1.5rem; 
  text-align: center; 
  margin: 2rem 0; 
}

.stat-item { 
  background-color: var(--background-color); 
  padding: 1.5rem; 
  border-radius: 8px; 
  border: 1px solid var(--border-color);
}

.stat-item h3 { 
  margin: 0 0 0.5rem; 
  font-size: 1rem; 
  color: var(--secondary-color); 
}

.stat-item p { 
  margin: 0; 
  font-size: 1.5rem; 
  font-weight: bold; 
  color: var(--primary-color); 
}

.stat-item.savings p { 
  color: var(--success-color); 
}

.error-view { 
  text-align: center; 
}

.error-view .error-icon { 
  color: var(--error-color); 
}

.error-view h2 { 
  color: var(--error-color); 
}

.error-view p { 
  background-color: #452323; 
  padding: 1rem; 
  border-radius: 8px; 
  color: #fecaca; 
  border: 1px solid var(--error-color);
  margin-bottom: 1.5rem; 
}

.icon-large { 
  width: 3rem; 
  height: 3rem; 
  margin: 0 auto 1rem; 
}

.app-footer {
  text-align: center;
  margin-top: 1rem;
  color: var(--secondary-color);
  font-size: 0.9rem;
}