/* style.css */
body {
    font-family: "Helvetica Neue", Arial, "Hiragino Kaku Gothic ProN", "Hiragino Sans", Meiryo, sans-serif;
    background-color: #f0f4f8; /* 少し青みのある優しいグレー */
    color: #333;
    line-height: 1.6;
    margin: 0;
    padding: 40px 20px;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    background: #fff;
    padding: 40px;
    border-radius: 16px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.05);
}

.header-area {
    text-align: center;
    margin-bottom: 30px;
}

/* 塾のサイト制作の経験を活かせるロゴ用エリア */
.logo {
    font-size: 24px;
    font-weight: bold;
    color: #4a90e2;
    margin-bottom: 10px;
}

textarea {
    width: 100%;
    height: 250px;
    border: 2px solid #e1e8ed;
    border-radius: 12px;
    padding: 20px;
    font-family: 'Courier New', Courier, monospace;
    font-size: 15px;
    box-sizing: border-box;
    outline: none;
    transition: border-color 0.3s;
}

textarea:focus {
    border-color: #4a90e2;
}

button {
    display: block;
    width: 100%;
    padding: 18px;
    margin-top: 25px;
    background-color: #4a90e2;
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 18px;
    font-weight: bold;
    cursor: pointer;
    box-shadow: 0 4px 6px rgba(74, 144, 226, 0.2);
    transition: transform 0.1s, background 0.3s;
}

button:hover {
    background-color: #357abd;
}

button:active {
    transform: translateY(2px);
}