/* ========================================
   基本設定
   ======================================== */
:root {
    --primary-color: #2563eb;
    --text-color: #333;
    --bg-color: #f8fafc;
    --accent-color: #ef4444;
    --border-color: #e2e8f0;
}

body {
    font-family: "Helvetica Neue", Arial, "Hiragino Kaku Gothic ProN", "Hiragino Sans", Meiryo, sans-serif;
    line-height: 1.8;
    color: var(--text-color);
    background-color: var(--bg-color);
    margin: 0;
    padding: 0;
}

.container {
    max-width: 850px;
    margin: 0 auto;
    padding: 20px;
    background-color: #fff;
    box-sizing: border-box;
}

/* ========================================
   ヘッダー・フッター
   ======================================== */
header {
    background-color: #fff;
    border-bottom: 3px solid var(--primary-color);
    padding: 20px 0;
    text-align: center;
}

.blog-title {
    font-size: 24px;
    font-weight: bold;
    color: var(--primary-color);
    margin: 0;
}

footer {
    text-align: center;
    padding: 40px 0;
    color: #64748b;
    font-size: 14px;
    background: #fff;
    border-top: 1px solid var(--border-color);
}

/* ========================================
   記事本文の装飾
   ======================================== */
.entry-header {
    margin-bottom: 40px;
    text-align: left;
}

.category {
    display: inline-block;
    background: var(--primary-color);
    color: #fff;
    padding: 2px 12px;
    border-radius: 4px;
    font-size: 14px;
    margin-bottom: 10px;
}

.post-date {
    color: #64748b;
    font-size: 14px;
}

h1 {
    font-size: 28px;
    line-height: 1.4;
    margin: 10px 0;
    color: #1e293b;
}

h2 {
    position: relative;
    font-size: 24px;
    padding: 15px 20px;
    background: #f1f5f9;
    border-left: 6px solid var(--primary-color);
    margin-top: 50px;
    margin-bottom: 25px;
    color: #1e293b;
}

h3 {
    font-size: 20px;
    border-bottom: 2px solid var(--primary-color);
    padding-bottom: 8px;
    margin-top: 35px;
    color: var(--primary-color);
}

p {
    margin-bottom: 20px;
}

strong {
    color: #1e293b;
    background: linear-gradient(transparent 70%, #ffdf60 70%);
}

/* 用語解説ボックス */
.glossary {
    font-size: 0.9em;
    background: #f8fafc;
    padding: 15px 20px;
    border-radius: 8px;
    margin: 20px 0;
    border-left: 4px solid #94a3b8;
}

.glossary-term {
    font-weight: bold;
    color: var(--primary-color);
}

/* 強調・注意ボックス */
.highlight-box {
    background-color: #eff6ff;
    border: 1px solid #bfdbfe;
    padding: 20px;
    border-radius: 8px;
    margin: 30px 0;
}

.alert-box {
    background-color: #fff1f2;
    border: 1px solid #fecdd3;
    padding: 20px;
    border-radius: 8px;
    margin: 30px 0;
}

/* テーブル設定 */
.scroll-table {
    overflow-x: auto;
    margin: 30px 0;
}

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

th, td {
    border: 1px solid var(--border-color);
    padding: 15px;
    text-align: center;
}

th {
    background-color: #f1f5f9;
    font-weight: bold;
}

/* ========================================
   お問い合わせフォーム
   ======================================== */
.contact-section {
    margin-top: 80px;
    padding: 40px;
    background: #f1f5f9;
    border-radius: 12px;
}

.contact-section h2 {
    background: none;
    border: none;
    text-align: center;
    padding: 0;
    margin-top: 0;
    margin-bottom: 10px;
}

label {
    display: block;
    margin-bottom: 8px;
    font-weight: bold;
}

input[type="text"],
input[type="email"],
textarea {
    width: 100%;
    padding: 12px;
    margin-bottom: 20px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    box-sizing: border-box;
    font-size: 16px;
}

button[type="submit"] {
    display: block;
    width: 100%;
    padding: 16px;
    background: var(--primary-color);
    color: #fff;
    border: none;
    border-radius: 6px;
    font-size: 18px;
    font-weight: bold;
    cursor: pointer;
    transition: background 0.3s;
}

button[type="submit"]:hover {
    background: #1d4ed8;
}

/* ========================================
   レスポンシブ (スマホ対応)
   ======================================== */
@media (max-width: 600px) {
    .container {
        padding: 15px;
    }
    h1 {
        font-size: 22px;
    }
    h2 {
        font-size: 20px;
        padding: 10px 15px;
    }
    .contact-section {
        padding: 20px;
    }
}