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

body{
    min-height:100vh;
    display:flex;
    justify-content:center;
    align-items:center;
    background:linear-gradient(
        135deg,
        #667eea,
        #764ba2
    );
    font-family:"Yu Gothic UI",sans-serif;
    padding:20px;
}

.card{
    width:100%;
    max-width:650px;
    background:#ffffff;
    border-radius:24px;
    padding:40px;
    text-align:center;
    box-shadow:0 20px 50px rgba(0,0,0,.15);
}

.hero-icon{
    font-size:64px;
    margin-bottom:20px;
}

h1{
    font-size:40px;
    margin-bottom:20px;
}

.subtitle{
    font-size:18px;
    margin-bottom:35px;
    color:#555;
}

.button{
    display:block;
    width:100%;
    margin-top:15px;
    padding:18px;
    border-radius:14px;
    text-decoration:none;
    color:#fff;
    background:#4f46e5;
    transition:.2s;
    font-size:18px;
}

.button:hover{
    transform:translateY(-2px);
}

.form-area{
    margin-top:25px;
    text-align:left;
}

.form-label{
    display:block;
    margin:18px 0 8px;
    font-weight:bold;
    color:#333;
}

.input,
.textarea{
    width:100%;
    padding:14px;
    border:1px solid #ddd;
    border-radius:12px;
    font-size:16px;
    font-family:inherit;
}

.textarea{
    min-height:150px;
    resize:vertical;
}

.button-submit{
    border:none;
    cursor:pointer;
    font-family:inherit;
}

.button-secondary{
    background:#64748b;
}

.result-message{
    margin-top:20px;
    font-weight:bold;
    color:#4f46e5;
    text-align:center;
}

.wide-card{
    max-width:850px;
}

.admin-box{
    margin-top:25px;
    text-align:left;
}

.message-list{
    margin-top:25px;
    display:grid;
    gap:16px;
}

.message-card{
    padding:18px;
    border:1px solid #e5e7eb;
    border-radius:16px;
    background:#fafafa;
    text-align:left;
}

.message-name{
    font-weight:bold;
    color:#111827;
}

.message-date{
    margin-top:4px;
    font-size:13px;
    color:#6b7280;
}

.message-text{
    margin-top:12px;
    line-height:1.7;
    white-space:pre-wrap;
    color:#333;
}

.small-textarea{
    min-height:90px;
}

.button-submit:disabled{
    opacity:.65;
    cursor:not-allowed;
    transform:none;
}

.success-message{
    color:#16a34a;
}

.error-message{
    color:#dc2626;
}