body {
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    min-height: 100vh;
}
.main-container {
    max-width: 800px;
    margin: 2rem auto;
    padding: 2rem;
    background: white;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}
.drop-zone {
    padding: 3rem;
    text-align: center;
    background: #f8f9fa;
    border: 2px dashed #dee2e6;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
}
.drop-zone:hover {
    background: #e9ecef;
    border-color: #adb5bd;
}
.drop-zone i {
    font-size: 3rem;
    color: #6c757d;
    margin-bottom: 1rem;
}
.preview-container {
    display: none;
    margin-top: 2rem;
}
.preview-container img {
    max-width: 100%;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}
.btn-custom {
    padding: 0.8rem 2rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: all 0.3s ease;
}
.loader {
    display: none;
    text-align: center;
    margin: 2rem 0;
}
.loader i {
    font-size: 2rem;
    color: #007bff;
}
.result-container {
    display: none;
    margin-top: 2rem;
}