* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    background: white;
    border-radius: 15px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
    overflow: hidden;
}

h1 {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 20px;
    text-align: center;
    font-size: 24px;
}

form {
    padding: 30px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: #333;
    font-size: 14px;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 14px;
    transition: all 0.3s;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102,126,234,0.1);
}

.form-group small {
    display: block;
    margin-top: 5px;
    color: #888;
    font-size: 12px;
}

h3 {
    color: #667eea;
    margin: 20px 0 15px 0;
    padding-bottom: 8px;
    border-bottom: 2px solid #667eea;
}

.button-group {
    display: flex;
    gap: 15px;
    margin-top: 30px;
}

.btn {
    flex: 1;
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-preview {
    background: #4CAF50;
    color: white;
}

.btn-preview:hover {
    background: #45a049;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(76,175,80,0.3);
}

.btn-download {
    background: #2196F3;
    color: white;
}

.btn-download:hover {
    background: #0b7dda;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(33,150,243,0.3);
}

@media (max-width: 768px) {
    .button-group {
        flex-direction: column;
    }
    
    form {
        padding: 20px;
    }
}