/* Responsive Design */
@media (max-width: 480px) {
    body {
        padding: 12px;
    }
    
    .container {
        padding: 20px;
        border-radius: var(--radius);
        max-width: 100%;
    }
    
    h1 {
        font-size: 1.5rem;
    }
    
    .subtitle {
        font-size: 0.9rem;
    }
    
    .section {
        padding: 18px;
        margin-bottom: 16px;
    }
    
    .btn {
        padding: 14px;
        font-size: 1rem;
    }
    
    .result-title {
        font-size: 1.2rem;
    }
    
    .cert-info {
        margin-bottom: 14px;
        padding-bottom: 14px;
    }
    
    .progress-container {
        height: 28px;
    }
    
    .progress-bar {
        font-size: 0.9rem;
    }
    
    .loading-step-text {
        font-size: 0.8rem;
    }
}

@media (max-width: 350px) {
    .container {
        padding: 16px;
    }
    
    h1 {
        font-size: 1.4rem;
    }
    
    .section {
        padding: 16px;
    }
    
    .form-group {
        margin-bottom: 16px;
    }
    
    .file-input-label {
        padding: 24px 16px;
    }
}