/* style.css */

/* リセットCSS */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: "Helvetica Neue", Arial, "Hiragino Kaku Gothic ProN", "Hiragino Sans", Meiryo, sans-serif;
    background-color: #fefefe;
    color: #333;
    line-height: 1.6;
    text-align: center;
}

/* ヘッダー */
header {
    background-color: #fff0f5; /* ラベンダーピンク系 */
    padding: 20px 0;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    position: relative;
}

.site-title {
    font-size: 24px;
    font-weight: 700;
    letter-spacing: 1px;
    margin-bottom: 5px;
}

.site-description {
    font-size: 14px;
    color: #777;
}

/* ナビゲーション */
nav {
    margin: 20px auto;
    max-width: 600px;
}

nav ul {
    display: flex;
    justify-content: center;
    list-style: none;
    flex-wrap: wrap;
}

nav li {
    margin: 0 15px;
}

nav a {
    color: #555;
    text-decoration: none;
    padding: 5px 0;
    position: relative;
    font-weight: 500;
    transition: color 0.3s;
}

nav a:hover {
    color: #ff69b4; /* pastel pink */
}

nav a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: #ffb6c1;
    transition: width 0.3s;
}

nav a:hover::after {
    width: 100%;
}

/* メイン */
.main-content {
    max-width: 1000px;
    margin: 30px auto;
    padding: 0 20px;
}

/* カードグリッド */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 30px;
    margin-top: 30px;
}

.card {
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.08);
    transition: transform 0.3s, box-shadow 0.3s;
}

.card:nth-child(4n+1) { background-color: #f8c8dc; } /* ピンク */
.card:nth-child(4n+2) { background-color: #fff4b2; } /* 黄色 */
.card:nth-child(4n+3) { background-color: #d4f8be; } /* 黄緑 */
.card:nth-child(4n+4) { background-color: #c2f0f7; } /* 水色 */

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.12);
}

.card-image {
    width: 100%;
    height: 180px;
    object-fit: cover;
}

.card-content {
    padding: 20px;
}

.card-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 8px;
}

.card-description {
    font-size: 14px;
    color: #444;
    margin-bottom: 15px;
}

.card-link {
    display: inline-block;
    padding: 8px 16px;
    background-color: #a0d8ef; /* 水色系 */
    color: #333;
    text-decoration: none;
    border-radius: 4px;
    font-size: 14px;
    transition: background-color 0.3s;
}

.card-link:hover {
    background-color: #82cde3;
}

/* フッター */
footer {
    background-color: #333;
    color: #fff;
    padding: 20px 0;
    margin-top: 50px;
    font-size: 14px;
}

/* レスポンシブ */
@media (max-width: 767px) {
    .cards-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    nav ul {
        flex-direction: column;
        gap: 10px;
    }

    nav li {
        margin: 5px 0;
    }
}