/* 全体のリセットとベース設定 */
body {
    margin: 0;
    padding: 0;
    font-family: "Helvetica Neue", Arial, "Hiragino Kaku Gothic ProN", "Hiragino Sans", sans-serif;
    background-color: #fcfcfc;
    color: #333;
    line-height: 1.8;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ヘッダー */
header {
    background-color: #fff;
    padding: 60px 0 40px;
    text-align: center;
    border-bottom: 1px solid #eee;
}

header h1 {
    font-size: 2rem;
    margin: 0;
    letter-spacing: 2px;
}

.subtitle {
    font-size: 0.9rem;
    color: #888;
}

/* イントロ部分 */
.intro {
    padding: 40px 0;
    text-align: center;
    font-size: 0.95rem;
}

/* カードレイアウト */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    margin-bottom: 80px;
}

.card {
    background: #fff;
    border: 1px solid #eee;
    border-radius: 4px;
    transition: transform 0.2s;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 15px rgba(0,0,0,0.05);
}

.card-content {
    padding: 25px;
}

.category {
    font-size: 0.75rem;
    color: #007bff;
    font-weight: bold;
    display: block;
    margin-bottom: 10px;
}

.card h2 {
    font-size: 1.2rem;
    margin: 0 0 15px 0;
}

.card p {
    font-size: 0.9rem;
    color: #666;
    margin-bottom: 20px;
}

.btn {
    display: inline-block;
    padding: 8px 20px;
    border: 1px solid #333;
    text-decoration: none;
    color: #333;
    font-size: 0.8rem;
    transition: 0.3s;
}

.btn:hover {
    background: #333;
    color: #fff;
}

/* フッター */
footer {
    text-align: center;
    padding: 40px;
    font-size: 0.8rem;
    color: #aaa;
    border-top: 1px solid #eee;
}