/* --- 全体設定 --- */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: "Helvetica Neue", Arial, "Hiragino Kaku Gothic ProN", "Hiragino Sans", Meiryo, sans-serif;
    line-height: 1.8;
    color: #333;
    background-color: #f5f7f9;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 20px;
}

/* --- ヘッダー --- */
.site-header {
    background-color: #ffffff;
    padding: 40px 0;
    text-align: center;
    border-bottom: 1px solid #e1e8ed;
}

.site-header h1 {
    font-size: 1.5rem;
    color: #2c3e50;
    letter-spacing: 2px;
}

.site-header p {
    font-size: 0.9rem;
    color: #7f8c8d;
}

/* --- 記事本文エリア --- */
.post {
    background-color: #ffffff;
    padding: 40px;
    margin-top: 30px;
    margin-bottom: 60px;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.05);
}

.post-header {
    margin-bottom: 40px;
    border-bottom: 2px solid #f0f0f0;
    padding-bottom: 20px;
}

.category {
    display: inline-block;
    background-color: #3498db;
    color: #fff;
    padding: 2px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    margin-bottom: 10px;
}

.post-header h1 {
    font-size: 1.8rem;
    line-height: 1.4;
    color: #2c3e50;
}

.post-meta {
    font-size: 0.85rem;
    color: #95a5a6;
    margin-top: 10px;
}

/* --- 見出し --- */
h2 {
    font-size: 1.5rem;
    color: #2c3e50;
    margin: 40px 0 20px;
    padding-bottom: 10px;
    border-bottom: 3px solid #3498db;
}

h3 {
    font-size: 1.2rem;
    margin: 25px 0 15px;
    color: #34495e;
}

/* --- テキスト装飾 --- */
p {
    margin-bottom: 20px;
}

strong {
    color: #e67e22;
}

/* --- 用語解説ボックス --- */
.term-box {
    background-color: #fdfaf0;
    border: 1px solid #f1c40f;
    padding: 20px;
    border-radius: 8px;
    margin: 30px 0;
}

.term-box h3 {
    margin-top: 0;
    font-size: 1.1rem;
    color: #d4ac0d;
}

.term-box ul {
    list-style: none;
}

.term-box li {
    margin-bottom: 10px;
    font-size: 0.95rem;
}

/* --- テーブル --- */
.table-wrapper {
    overflow-x: auto;
    margin: 20px 0;
}

table {
    width: 100%;
    border-collapse: collapse;
    min-width: 500px;
}

th, td {
    padding: 15px;
    border: 1px solid #e1e8ed;
    text-align: center;
}

th {
    background-color: #f9fafb;
    color: #7f8c8d;
}

.accent-text {
    font-weight: bold;
    color: #e74c3c;
    font-size: 1.1rem;
}

.table-note {
    font-size: 0.8rem;
    color: #95a5a6;
    text-align: right;
}

/* --- メリット・デメリットボックス --- */
.point-box {
    padding: 20px;
    border-radius: 8px;
    margin: 20px 0;
}

.pros {
    background-color: #ebf9f2;
    border-left: 5px solid #2ecc71;
}

.cons {
    background-color: #fef2f2;
    border-left: 5px solid #e74c3c;
}

.point-box h3 {
    margin-top: 0;
}

.point-box ul {
    padding-left: 20px;
}

/* --- まとめエリア --- */
.summary {
    background-color: #f0f7ff;
    padding: 30px;
    border-radius: 8px;
    margin-top: 40px;
}

.summary h2 {
    border-bottom: none;
    margin-top: 0;
}

/* --- お問い合わせフォーム --- */
.contact-section {
    margin-top: 50px;
}

.contact-form {
    margin-top: 20px;
}

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

.contact-form label {
    display: block;
    font-weight: bold;
    margin-bottom: 6px;
    color: #2c3e50;
    font-size: 0.95rem;
}

.contact-form input[type="text"],
.contact-form input[type="email"],
.contact-form textarea {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid #ccd1d9;
    border-radius: 6px;
    font-size: 1rem;
    font-family: inherit;
    background-color: #fff;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.contact-form input[type="text"]:focus,
.contact-form input[type="email"]:focus,
.contact-form textarea:focus {
    border-color: #3498db;
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.15);
    outline: none;
}

.contact-form textarea {
    resize: vertical;
}

.submit-btn {
    display: block;
    width: 100%;
    max-width: 240px;
    margin: 30px auto 0;
    padding: 14px 20px;
    background-color: #3498db;
    color: #ffffff;
    font-size: 1rem;
    font-weight: bold;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: background-color 0.2s, transform 0.1s;
}

.submit-btn:hover {
    background-color: #2980b9;
}

.submit-btn:active {
    transform: scale(0.99);
}

/* --- フッター --- */
.site-footer {
    padding: 40px 0;
    text-align: center;
    color: #95a5a6;
    font-size: 0.85rem;
}

/* --- レスポンシブ (スマホ対応) --- */
@media (max-width: 600px) {
    .post {
        padding: 20px;
    }
    .post-header h1 {
        font-size: 1.4rem;
    }
    h2 {
        font-size: 1.25rem;
    }
    .submit-btn {
        max-width: 100%;
    }
}