body {
    font-family: 'Hiragino Maru Gothic ProN', 'Rounded M+ 1c', 'Meiryo', sans-serif;
    background-color: #f4fcff;
    color: #444;
    text-align: center;
    padding: 40px 15px;
    margin: 0;
}

a {
  text-decoration: none;
}

.container {
    background-color: #ffffff;
    max-width: 600px;
    margin: 0 auto;
    padding: 40px 30px;
    border-radius: 20px;
    box-shadow: 0 8px 16px rgba(0,0,0,0.05);
    border: 4px solid #ffe4b5;
}
.emoji-header {
    font-size: 48px;
    margin-bottom: 15px;
}
h1 {
    color: #ff7f50;
    font-size: 24px;
    line-height: 1.4;
    margin-bottom: 25px;
}
h1 ruby {
    ruby-align: center;
}
rt {
    font-size: 11px;
    color: #ff7f50;
}
p {
    font-size: 16px;
    line-height: 1.8;
    margin-bottom: 20px;
}
.message-box {
    background-color: #fffacd;
    padding: 20px;
    border-radius: 12px;
    margin-bottom: 30px;
    text-align: left;
}
.btn {
    display: inline-block;
    background-color: #32cd32;
    color: #ffffff;
    padding: 15px 40px;
    text-decoration: none;
    font-size: 18px;
    font-weight: bold;
    border-radius: 50px;
    box-shadow: 0 4px 6px rgba(50, 205, 50, 0.3);
    transition: all 0.3s ease;
}
.btn:hover {
    background-color: #28a428;
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(50, 205, 50, 0.4);
}
.footer {
    margin-top: 30px;
    font-size: 12px;
    color: #888;
}