body {
    font-family: "Helvetica Neue", Arial, "Hiragino Kaku Gothic ProN", "Hiragino Sans", sans-serif;
    background-color: #fffff0;
    color: #333;
    line-height: 1.5;
    margin: 0;
    padding: 20px;
}
.container {
    max-width: 800px;
    margin: 0 auto;
}

h1 {
    text-align: center;
    margin-bottom: 40px;
    color: #2c3e50;
}

/* タイムラインの全体枠 */
.timeline {
    position: relative;
    padding-left: 15px; /* 左側に線のスペースを確保 */
}

/* 垂直な線 */
.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    width: 2px;
    height: 100%;
    background-color: #d1d;
}

/* 各イベントの間隔 */
.timeline-item {
    position: relative;
    margin-bottom: 40px;
}

/* タイムライン上の丸いドット */
.timeline-item::before {
    content: '';
    position: absolute;
    left: -22px; /* 線の上に配置 */
    top: 5px;
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background-color: #3498db;
    border: 3px solid #fff;
    box-shadow: 0 0 0 2px #3498db;
    z-index: 1;
}

/* 日付のスタイル */
.timeline-date {
    font-size: 0.9rem;
    font-weight: bold;
    color: #7f8c8c;
    margin-bottom: 8px;
}
.timeline-content {
    background: #fff;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}
.timeline-content h2 {
    margin: 0 0 10px 0;
    font-size: 1.25rem;
    color: #2c3e50;
}
.timeline-content p {
    margin: 0 0 15px 0;
    font-size: 0.95rem;
}