:root {
  --primary-color: #1a73e8;
  --secondary-color: #f8f9fa;
  --text-color: #202124;
  --border-color: #dadce0;
  --success-color: #0f9d58;
  --error-color: #d93025;
  --hover-color: #f1f3f4;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  color: var(--text-color);
  line-height: 1.6;
  background-color: var(--secondary-color);
}

.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 2rem;
}

header {
  text-align: center;
  margin-bottom: 2rem;
}

header h1 {
  color: var(--primary-color);
  margin-bottom: 0.5rem;
}

main {
  background-color: white;
  border-radius: 8px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  padding: 2rem;
  margin-bottom: 2rem;
}

.upload-container {
  margin-bottom: 2rem;
}

.drop-area {
  border: 2px dashed var(--border-color);
  border-radius: 8px;
  padding: 2rem;
  text-align: center;
  transition: all 0.3s ease;
  cursor: pointer;
}

.drop-area.highlight {
  border-color: var(--primary-color);
  background-color: rgba(26, 115, 232, 0.05);
}

.drop-area p {
  margin-bottom: 1rem;
  color: #5f6368;
}

.file-info {
  margin-top: 1rem;
  padding: 1rem;
  border-radius: 8px;
  background-color: var(--secondary-color);
}

button {
  background-color: var(--primary-color);
  color: white;
  border: none;
  border-radius: 4px;
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
  cursor: pointer;
  transition: background-color 0.3s ease;
}

button:hover {
  background-color: #1669d9;
}

button:disabled {
  background-color: var(--border-color);
  cursor: not-allowed;
}

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

.spinner {
  border: 4px solid rgba(0, 0, 0, 0.1);
  border-left-color: var(--primary-color);
  border-radius: 50%;
  width: 40px;
  height: 40px;
  animation: spin 1s linear infinite;
  margin: 0 auto 1rem;
}

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

.results {
  text-align: center;
  padding: 1rem;
  background-color: #e6f4ea;
  border-radius: 8px;
  border-left: 4px solid var(--success-color);
}

.results h2 {
  color: var(--success-color);
  margin-bottom: 1rem;
}

.results button {
  margin-top: 1rem;
  background-color: var(--success-color);
}

.results button:hover {
  background-color: #0b8b4b;
}

.error {
  text-align: center;
  padding: 1rem;
  background-color: #fce8e6;
  border-radius: 8px;
  border-left: 4px solid var(--error-color);
}

.error h2 {
  color: var(--error-color);
  margin-bottom: 1rem;
}

.error button {
  margin-top: 1rem;
  background-color: var(--error-color);
}

.error button:hover {
  background-color: #c62b1e;
}

footer {
  text-align: center;
  color: #5f6368;
  font-size: 0.9rem;
}

.hidden {
  display: none;
}