body {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.main-container {
    background: white;
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
    position: relative;
    overflow: hidden;
}



.stamp-logo {
    width: 80px;
    height: 80px;
    flex-shrink: 0;
}

.logo-circle {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #dc143c, #b71c1c);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 32px;
    font-weight: bold;
    margin: 0 auto 30px;
}

.upload-area {
    border: 3px dashed #ddd;
    border-radius: 15px;
    background: #fafafa;
    transition: all 0.3s ease;
    cursor: pointer;
    min-height: 200px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.upload-area:hover {
    border-color: #667eea;
    background: #f0f4ff;
    transform: translateY(-2px);
}

.upload-area.dragover {
    border-color: #667eea;
    background: #e3f2fd;
    transform: scale(1.02);
}

.upload-area.file-selected {
    border-color: #28a745;
    background: #f1f8e9;
}

.upload-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 24px;
    margin-bottom: 20px;
}

.email-section {
    background: #f8f9fa;
    border-radius: 15px;
}

.email-icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 20px;
    margin: 0 auto 20px;
}

.btn-upload {
    background: linear-gradient(135deg, #dc3545, #b71c1c) !important;
    border: none;
    box-shadow: 0 4px 15px rgba(220, 53, 69, 0.3);
    transition: all 0.3s ease;
}

.btn-upload:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(220, 53, 69, 0.4);
    background: linear-gradient(135deg, #c82333, #a61e1e) !important;
}

.step-number {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    margin: 0 auto 10px;
}

.feature-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    margin: 0 auto 15px;
}

.spinner-border-custom {
    width: 50px;
    height: 50px;
    border: 4px solid #f3f3f3;
    border-top: 4px solid #667eea;
}

.form-control:focus {
    border-color: #667eea;
    box-shadow: 0 0 0 0.2rem rgba(102, 126, 234, 0.25);
}

html, body {
    height: 100%;
    margin: 0;
}

body {
    display: grid;
    place-items: center;
}