*, body, h1, p, a {
    font-family: 'Noto Serif JP', 'Yu Mincho', '游明朝', 'Hiragino Mincho ProN', 'ヒラギノ明朝 ProN W3', 'BIZ UDPMincho', 'MS PMincho', 'ＭＳ Ｐ明朝', serif;
}
body {
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
    color: #333;
    line-height: 1.8;
}
.container {
    max-width: 100%;
    margin: 0 auto;
    padding: 0;
    background-color: #fff;
    box-shadow: 0 0 15px rgba(0,0,0,0.1);
}
.header {
    text-align: center;
    padding: 30px 20px 20px;
}
.logo {
    max-width: 220px;
    width: 100%;
    height: auto;
}
.campaign-banner {
    display: block;
    width: 800px;
    max-width: 100%;
    height: auto;
    margin: 15px auto 0;
}
.catchphrase {
    text-align: center;
    padding: 0 20px;
}
.catchphrase .wait {
    color: #e60012;
    font-size: 1.1rem;
    font-weight: bold;
    margin: 0 0 5px 0;
}
.catchphrase .title {
    font-size: 1.5rem;
    font-weight: bold;
    margin: 0 0 20px 0;
    letter-spacing: 1px;
}
.cover-area {
    text-align: center;
    padding: 0 20px;
    margin-bottom: 30px;
}
.cover-image {
    max-width: 100%;
    height: auto;
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
}
.description {
    padding: 0 20px;
    margin-bottom: 40px;
    font-size: 1.05rem;
    text-align: justify;
}
.buttons-container {
    background-color: #f9f9f9;
    padding: 30px 20px;
    border-top: 1px solid #eaeaea;
    border-bottom: 1px solid #eaeaea;
    margin-bottom: 40px;
}
.buttons {
    display: flex;
    flex-direction: column;
    gap: 15px;
    align-items: center;
}
.btn {
    display: block;
    width: 100%;
    max-width: 280px;
    transition: transform 0.2s ease, opacity 0.2s ease;
}
.btn:hover {
    transform: translateY(-2px);
    opacity: 0.9;
}
.btn img {
    width: 100%;
    height: auto;
    display: block;
}
.notice {
    padding: 0 20px 40px;
    font-size: 0.95rem;
    color: #555;
}
.notice p {
    margin-bottom: 15px;
}
.notice p:last-child {
    margin-bottom: 0;
}
.footer {
    text-align: center;
    padding: 30px 20px;
    border-top: 1px solid #eaeaea;
    font-size: 0.9rem;
    background-color: #fff;
}
.footer a {
    color: #555;
    text-decoration: none;
    transition: color 0.2s ease;
}
.footer a:hover {
    color: #e60012;
    text-decoration: underline;
}

/* バックナンバー枠の基本スタイル */
.backnumber-container {
    padding: 0 20px 40px;
    border-top: 1px solid #eaeaea;
    margin-top: 20px;
    padding-top: 40px;
    text-align: center;
}
.section-title {
    font-size: 1.2rem;
    margin-top: 0;
    margin-bottom: 20px;
    color: #333;
}
.backnumber-list {
    display: flex;
    flex-direction: row;
    align-items: flex-start;
    gap: 24px;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    scroll-behavior: smooth;
    -webkit-overflow-scrolling: touch;
    padding-bottom: 8px;
    scrollbar-width: none;
    -ms-overflow-style: none;
    width: 100%;
    max-width: 244px;
    margin: 0 auto;
}
.backnumber-list::-webkit-scrollbar {
    display: none;
}
.backnumber-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
    flex: 0 0 200px;
    scroll-snap-align: start;
}
.backnumber-info {
    text-align: center;
    width: 100%;
}
.cover-image-small {
    max-width: 200px;
    width: 100%;
    height: auto;
    box-shadow: 0 3px 10px rgba(0,0,0,0.2);
}
.backnumber-title {
    font-size: 0.95rem;
    font-weight: bold;
    margin: 12px 0 0 0;
    line-height: 1.5;
    color: #333;
}
.backnumber-btn {
    max-width: 280px;
    width: 100%;
    display: flex;
    align-items: center;
    margin: 30px auto 0;
}

/* タブレット向けスタイル (幅768px以上) */
@media (min-width: 768px) {
    .container {
        max-width: 750px;
    }
    .catchphrase .wait {
        font-size: 1.3rem;
    }
    .catchphrase .title {
        font-size: 1.8rem;
    }
    .cover-image {
        max-width: 70%;
    }
    .buttons {
        flex-direction: row;
        flex-wrap: wrap;
        justify-content: center;
        gap: 20px;
    }
    .btn {
        width: calc(50% - 10px);
        max-width: 280px;
    }
}

/* PC向けスタイル (幅1200px以上) */
@media (min-width: 1200px) {
    .container {
        max-width: 1200px;
    }
    .header {
        padding: 40px 20px 30px;
    }
    .logo {
        max-width: 280px;
    }
    .catchphrase .wait {
        font-size: 1.4rem;
    }
    .catchphrase .title {
        font-size: 2.2rem;
        margin-bottom: 30px;
    }
    .cover-area {
        margin-bottom: 40px;
    }
    .cover-image {
        max-width: 1000px; /* 大画面でも間伸びしない最適なサイズ */
    }
    .description {
        max-width: 800px;
        margin: 0 auto 50px;
        padding: 0;
        font-size: 1.15rem;
        text-align: center; /* PCでは中央寄せで見やすく */
    }
    .buttons-container {
        padding: 40px 50px;
        margin-bottom: 50px;
    }
    .buttons {
        flex-direction: row;
        flex-wrap: nowrap; /* 4つのボタンを横一列に並べる */
        justify-content: center;
        gap: 20px;
        max-width: 1100px;
        margin: 0 auto;
    }
    .btn {
        width: 240px;
        max-width: none;
    }
    .notice {
        max-width: 800px;
        margin: 0 auto;
        padding: 0 0 60px 0;
        font-size: 1rem;
    }
    .backnumber-list {
        flex-direction: row;
        justify-content: center;
        gap: 60px;
        overflow-x: visible;
        scroll-snap-type: none;
        scroll-behavior: auto;
        padding-bottom: 0;
        width: auto;
        max-width: none;
    }
    .backnumber-item {
        flex: 0 0 auto;
        scroll-snap-align: none;
    }
}