body {
    font-family: 'Inter', sans-serif;
}
.file-drop-area {
    transition: all 0.3s ease;
}
.file-drop-area.dragover {
    background-color: #374151; /* gray-700 */
    border-color: #4f46e5; /* indigo-600 */
}
.style-option {
    transition: all 0.2s ease-in-out;
    cursor: pointer;
}
.style-option.selected {
    background-color: #4f46e5; /* indigo-600 */
    color: white;
    transform: scale(1.05);
}
.loader {
    border-top-color: #4f46e5; /* indigo-600 */
    animation: spin 1s linear infinite;
}
@keyframes spin {
    to { transform: rotate(360deg); }
}
@keyframes pulse-glow {
    0%, 100% {
        box-shadow: 0 0 8px rgba(99, 102, 241, 0.6), 0 0 16px rgba(99, 102, 241, 0.4);
    }
    50% {
        box-shadow: 0 0 16px rgba(129, 140, 248, 0.8), 0 0 32px rgba(129, 140, 248, 0.6);
    }
}
.ready-to-analyze:not(:disabled) {
    animation: pulse-glow 2.5s infinite;
}