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

body{
    font-family:"Malgun Gothic", sans-serif;
    background:#f5f7fa;

    display:flex;
    justify-content:center;
    align-items:center;

    min-height:100vh;
}

.container{
    width:90%;
    max-width:900px;

    background:white;

    padding:40px;

    border-radius:20px;

    box-shadow:0 10px 30px rgba(0,0,0,0.1);

    text-align:center;
}

h1{
    margin-bottom:20px;
}

.description{
    margin-bottom:40px;
    line-height:1.7;
}

.button-container{
    display:flex;
    justify-content:center;
    align-items:center;
    gap:30px;
    flex-wrap:wrap;

    margin-bottom:40px;
}

.survey-btn{
    border: 2px solid #d1d5db;

    background: #ffffff;
    color: #333333;

    border-radius: 12px;

    cursor: pointer;

    box-shadow: 0 4px 10px rgba(0,0,0,0.08);

    transition: all 0.2s ease;
}

.survey-btn:hover{
    transform: translateY(-2px);

    box-shadow: 0 8px 18px rgba(0,0,0,0.12);
}

.small{
    width:100px;
    height:40px;
    font-size:14px;
}

.medium{
    width:150px;
    height:60px;
    font-size:16px;
}

.large{
    width:225px;
    height:90px;
    font-size:20px;
}

.message{
    min-height:40px;

    font-size:18px;
    font-weight:bold;
}