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

.download-btn.searching i,
.download-btn.loading i {
    animation: spin 1s linear infinite;
}

.download-btn.disabled,
.download-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    pointer-events: none;
}

.download-sidebar {
    background-color: #fff;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    padding: 20px;
    position: sticky;
    top: 20px;
    align-self: start;
}

.sidebar-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 1px solid #e2e8f0;
}

.sidebar-header i {
    color: #4a6fa5;
    font-size: 1.2rem;
}

.sidebar-header h3 {
    margin: 0;
    font-size: 1rem;
    color: #333;
}

.download-info {
    background-color: #f8f9fa;
    padding: 20px;
    border-radius: 8px;
}

.download-btn {
    display: block;
    width: 100%;
    background-color: #4a6fa5;
    color: white;
    border: none;
    padding: 10px;
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: center;
    text-decoration: none;
}

.download-btn:hover {
    background-color: #6b9ac4;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.download-btn i {
    margin-right: 8px;
}

.download-btn.searching {
    cursor: wait;
    background-color: #6b9ac4;
    transform: none;
}