/* --- 基本設定（シンプル・読みやすい） --- */
:root {
    --color-primary: #28a745;    /* メイン（緑） */
    --color-secondary: #f39c12; /* アクセント（オレンジ） */
    --color-text: #333;
    --color-bg-light: #f8f9fa;
    --color-white: #ffffff;
    --color-highlight: #fff3cd;
}

/* --- ★修正：ジャンプ位置調整（アンカーパディング） --- */
html {
    scroll-behavior: smooth;
    /* PC_ヘッダー(70px) + 余白(20px) = 90px */
    scroll-padding-top: 90px; 
}

body {
    margin: 0;
    padding: 0;
    font-family: 'Noto Sans JP', 'Hiragino Kaku Gothic ProN', 'Meiryo', sans-serif;
    line-height: 1.7;
    color: var(--color-text);
    -webkit-text-size-adjust: 100%;
    
    /* 修正1：背景ドットの視認性UP (色を濃く、間隔を狭く) */
    background-color: var(--color-white);
    background-image: radial-gradient(#e0e0e0 1px, transparent 1px);
    background-size: 12px 12px;

    /* --- ★追加：固定ヘッダー分の余白 --- */
    padding-top: 70px;
}

.container {
    max-width: 960px;
    margin: 0 auto;
    padding: 0 20px;
}

h1, h2, h3, h4 {
    font-weight: 700;
    margin-top: 0;
}
h2 { font-size: 2rem; }
h3 {
    font-size: 1.8rem;
    text-align: center;
    margin-bottom: 30px;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: var(--color-primary);
    text-decoration: none;
}

section {
    padding: 60px 0;
}
section:nth-of-type(even) {
    background-color: var(--color-bg-light);
}

/* 修正4：出典リンク用のスタイル */
.text-link {
    font-size: 0.85rem;
    font-weight: 700;
    text-decoration: underline;
    margin-left: 5px;
    white-space: nowrap;
}
.text-link:hover {
    color: var(--color-secondary);
}


/* --- ヘッダー --- */
.header {
    /* --- ★変更：固定ヘッダー化 --- */
    padding: 10px 0; /* 高さを調整 */
    background-color: var(--color-white);
    border-bottom: 1px solid #ddd;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
}
.header h1 {
    font-size: 1rem;
    margin: 0;
    color: var(--color-text);
    /* --- ★変更：レイアウト調整 --- */
    text-align: left; /* ロゴは左寄せに */
    flex-shrink: 0; /* スマホ表示で縮まないように */
}

/* --- ★追加：固定ヘッダー＆ナビゲーション --- */
.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* PC用ナビゲーション */
.global-nav {
    display: block; /* PCでは表示 */
}
.global-nav ul {
    display: flex;
    align-items: center;
    list-style: none;
    margin: 0;
    padding: 0;
    gap: 20px;
}
.global-nav li a {
    font-weight: 700;
    color: var(--color-text);
    transition: color 0.3s;
    text-decoration: none;
    white-space: nowrap;
}
.global-nav li a:hover {
    color: var(--color-primary);
}

/* スマホ用ハンバーガーボタン */
.menu-toggle-btn {
    display: none; /* PCでは非表示 */
    background: none;
    border: none;
    cursor: pointer;
    padding: 10px;
    z-index: 1010;
}
.menu-toggle-btn span {
    display: block;
    width: 25px;
    height: 3px;
    background-color: var(--color-text);
    margin: 5px 0;
    transition: all 0.3s ease-in-out;
}

/* スマホ用ドロワーメニュー（普段は非表示） */
.global-nav-sp {
    display: none;
    position: fixed;
    top: 70px; /* ヘッダーの高さ分 */
    left: 0;
    width: 100%;
    height: calc(100vh - 70px);
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(5px);
    padding-top: 20px;
    z-index: 999;
    overflow-y: auto;
}
.global-nav-sp ul {
    list-style: none;
    margin: 0;
    padding: 0;
}
.global-nav-sp li {
    border-bottom: 1px solid #eee;
}
.global-nav-sp li a {
    display: block;
    padding: 20px;
    text-align: center;
    font-weight: 700;
    color: var(--color-text);
    text-decoration: none;
}
.global-nav-sp li a:hover {
    background: var(--color-bg-light);
}

/* JSで .menu-open クラスを body に付与した場合 */
.menu-open .global-nav-sp {
    display: block;
}
.menu-open .menu-toggle-btn span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}
.menu-open .menu-toggle-btn span:nth-child(2) {
    opacity: 0;
}
.menu-open .menu-toggle-btn span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
}
/* --- ★追加ここまで --- */


/* --- ヒーローセクション --- */
.hero {
    padding: 60px 0 80px 0;
    text-align: center;
    background: linear-gradient(to bottom, #f4fff8, var(--color-white));
    overflow: hidden; /* ★追加：アニメーションのはみ出し防止 */
}
.hero-slider-wrapper {
    max-width: 1200px;
    margin: 0 auto 30px auto;
    border-radius: 8px;
    box-shadow: 0 8px 20px rgba(0,0,0,0.1);
    position: relative;
    padding-top: 56.25%; /* 16:9 */
    overflow: hidden;
    background-color: #000;
}
.hero-image {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: contain;
    object-position: center;
    opacity: 0;
    transition: opacity 0.5s ease-in-out;
    animation: fadeSlider 6s infinite;  
}
.hero-image:nth-child(1) {
    animation-delay: 0s;
}
.hero-image:nth-child(2) {
    animation-delay: 3s;  
}
@keyframes fadeSlider {
    0% { opacity: 0; }
    8.3% { opacity: 1; }  /* 0.5s IN */
    50% { opacity: 1; }   /* 2.5s STAY */
    58.3% { opacity: 0; } /* 0.5s OUT */
    100% { opacity: 0; }
}

/* --- ★追加：フェードインアップアニメーション --- */
@keyframes fade-in-up {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero .main-catchphrase {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 10px;

    /* --- ★追加 1. ヒーローアニメーション --- */
    opacity: 0;
    animation: fade-in-up 0.8s ease-out 0.3s forwards;
}
.hero h2 {
    font-size: 2.2rem;
    line-height: 1.4;
    margin-bottom: 20px;
    color: var(--color-primary);

    /* --- ★追加 1. ヒーローアニメーション --- */
    opacity: 0;
    animation: fade-in-up 0.8s ease-out 0.5s forwards;
}
.hero .campaign-period {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--color-secondary);
    margin-bottom: 30px;
    background: var(--color-highlight);
    display: inline-block;
    padding: 5px 15px;
    border-radius: 50px;
    
    /* --- ★追加 1. ヒーローアニメーション --- */
    opacity: 0;
    animation: fade-in-up 0.8s ease-out 0.7s forwards;
}

/* --- ボタン（CTA） --- */
.btn {
    display: inline-block;
    padding: 12px 30px;
    border-radius: 50px;
    font-weight: 700;
    text-decoration: none;
    transition: all 0.3s ease;
    white-space: nowrap;
}
.btn-primary {
    background-color: var(--color-secondary);
    color: var(--color-white);
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
}
.btn-primary:hover {
    background-color: #e68a00;
    transform: translateY(-3px);
    box-shadow: 0 6px 15px rgba(0,0,0,0.15);
}
.btn-large {
    font-size: 1.2rem;
    padding: 15px 40px;
}

/* --- (Why) Aboutセクション --- */
.about-description {
    text-align: center;
    font-size: 1.1rem;
    max-width: 800px;
    margin: 0 auto 40px auto;
}
.about-flex {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 20px;
    flex-wrap: wrap;
}
.about-card {
    background: var(--color-white);
    border: 1px solid #eee;
    border-radius: 8px;
    padding: 30px;
    text-align: center;
    flex: 1;
    min-width: 280px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);

    /* --- ★追加 2. カードホバー --- */
    transition: transform 0.3s ease-out, box-shadow 0.3s ease-out;
}
/* --- ★追加 2. カードホバー --- */
.about-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 20px rgba(0,0,0,0.08);
}

.about-card .icon {
    width: 60px;
    height: 60px;
    margin: 0 auto 15px auto;
}
.icon-plus {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-primary);
    margin: 10px 0;
}

/* --- (How) How-toセクション --- */
.how-to-box {
    display: flex;
    align-items: center;
    background: var(--color-white);
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
    max-width: 800px;
    margin: 0 auto;
    overflow: hidden;
}
.how-to-image {
    flex: 0 0 150px;
    width: 150px;
    height: auto;
    object-fit: contain;
    padding: 20px;
}
.how-to-text {
    padding: 30px;
    flex: 1;
}
.how-to-text h4 {
    font-size: 1.4rem;
    color: var(--color-primary);
    margin-bottom: 15px;
    line-height: 1.4;
}
.how-to-text p {
    margin-bottom: 15px;
}
.how-to-text .small-note {
    font-size: 0.85rem;
    color: #777;
    margin-top: 10px;
}
.app-download-links {
    margin-top: 20px;
}
.app-download-links p {
    font-size: 0.9rem;
    margin-bottom: 10px;
}
.app-store-badge {
    display: inline-block;
    margin-right: 10px;
}
.app-store-badge img {
    height: 48px;
    width: auto;
}

/* --- Tips セクション --- */
.tip-card {
    background: var(--color-white);
    border: 1px solid #eee;
    border-radius: 8px;
    padding: 30px;
    margin-bottom: 20px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
}
.tip-card h4 {
    font-size: 1.3rem;
    color: var(--color-primary);
    margin-bottom: 10px;
}
.tip-card p {
    margin-bottom: 20px;
}
.tip-card p:last-child {
    margin-bottom: 0;
}

/* --- Prizes セクション --- */
.prizes h3 {
    line-height: 1.5;
}
.apply-summary {
    text-align: center;
    font-size: 1.1rem;
    margin-bottom: 40px;
}
.prize-structure {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    margin-bottom: 30px;
}
.prize-tier {
    background: var(--color-white);
    border: 2px solid #ddd;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
    display: flex;
    flex-direction: column;

    /* --- ★追加 2. カードホバー --- */
    transition: transform 0.3s ease-out, box-shadow 0.3s ease-out;
}
/* --- ★追加 2. カードホバー --- */
.prize-tier:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 20px rgba(0,0,0,0.08);
}

.prize-tier.tier-1 {
    flex: 1;
    border-color: var(--color-secondary);
    border-width: 3px;
}
.prize-tier.tier-2 {
    flex: 1.5;
    border-color: #ccc;
}
.prize-header {
    padding: 15px 20px;
    text-align: center;
    background: var(--color-bg-light);
    border-bottom: 1px solid #ddd;
}
.prize-tier.tier-1 .prize-header {
    background: var(--color-highlight);
}
.prize-tier.tier-2 .prize-header {
    background: #f0f0f0;
}
.prize-header .tier-label {
    display: inline-block;
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--color-white);
    background: var(--color-primary);
    padding: 3px 10px;
    border-radius: 50px;
    margin-bottom: 10px;
}
.prize-tier.tier-1 .tier-label {
    background: var(--color-secondary);
}
.prize-header h4 {
    font-size: 1.1rem;
    margin: 0;
    line-height: 1.5;
    height: 3.3em;
    display: flex;
    align-items: center;
    justify-content: center;
}
.prize-content {
    padding: 30px 20px;
    text-align: center;
    flex-grow: 1;
}
.prize-image {
    max-width: 250px;
    height: 180px;
    object-fit: contain;
    margin: 0 auto 15px auto;
}
.prize-value {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--color-primary);
    margin: 0 0 5px 0;
}
.prize-tier.tier-1 .prize-value {
    font-size: 2.2rem;
    color: var(--color-secondary);
}
.prize-winners {
    font-size: 1.2rem;
    font-weight: 700;
    margin: 0;
}

/* --- ▼▼▼ 修正箇所：BコースのレイアウトをGridに変更 ▼▼▼ --- */
.prize-content-grid {
    display: grid; /* flex から grid に変更 */
    grid-template-columns: repeat(3, 1fr); /* 3分割 */
    gap: 15px;
    padding: 30px;
    align-items: start; /* flex-start から start に変更 */
    flex-grow: 1;
}
.prize-item {
    /* flex: 1; を削除 */
    text-align: center;
}
.prize-image.small {
    max-width: 100%;
    height: auto; /* 100px から auto に変更 */
    object-fit: contain;
    margin: 0 auto 10px auto;
}
/* --- ▲▲▲ 修正箇所ここまで ▲▲▲ --- */

.prize-item .prize-value {
    font-size: 1.3rem;
}
.prize-item .prize-winners {
    font-size: 1rem;
}

/* --- ★変更：注意事項(legal-note)の調整 --- */
.legal-note {
    font-size: 0.9rem;
    color: #555;
    max-width: 700px;
    margin: 0 auto 30px auto;
    padding: 15px;
    background: var(--color-white);
    border: 1px solid #ddd;
    border-radius: 8px;
    text-align: left; /* 読みやすさのため左揃えに */
}
.legal-note p {
    margin: 0 0 10px 0;
}
.legal-note p:last-child {
    margin-bottom: 0;
}
.legal-note .details-link {
    text-align: center;
    margin-top: 15px;
    padding-top: 15px;
    border-top: 1px solid #eee;
}
.legal-note .details-link a {
    font-weight: 700;
    text-decoration: underline;
    color: var(--color-primary);
}
.legal-note .details-link a:hover {
    color: var(--color-secondary);
}
/* --- ★変更ここまで --- */


.review-campaign-box {
    background: var(--color-highlight);
    border: 2px dashed var(--color-secondary);
    border-radius: 8px;
    padding: 30px;
    max-width: 700px;
    margin: 0 auto;
    text-align: center;
}
.review-campaign-box h4 {
    font-size: 1.5rem;
    margin-bottom: 15px;
    color: #333;
}
.review-campaign-box .highlight {
    background: var(--color-secondary);
    color: var(--color-white);
    padding: 3px 10px;
    border-radius: 4px;
}
.review-campaign-box .strong {
    font-weight: 700;
    color: #c0392b;
}
.btn-review {
    display: inline-block;
    padding: 10px 25px;
    border-radius: 50px;
    font-weight: 700;
    text-decoration: none;
    transition: all 0.3s ease;
    white-space: nowrap;
    background-color: var(--color-white);
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
    margin-top: 20px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}
.btn-review:hover {
    background-color: var(--color-primary);
    color: var(--color-white);
    transform: translateY(-2px);
}

/* --- (What) Products セクション --- */
.products > .container > p {
    text-align: center;
    font-size: 1.1rem;
    margin-bottom: 10px;
}
.product-disclaimer {
    font-size: 0.9rem;
    color: #555;
    max-width: 700px;
    margin: 10px auto 40px auto;
    padding: 15px;
    background: var(--color-bg-light);
    border: 1px solid #ddd;
    border-radius: 8px;
    text-align: center;
}
.product-category {
    margin-bottom: 40px;
}
.product-category h4 {
    font-size: 1.4rem;
    text-align: left;
    color: var(--color-primary);
    border-bottom: 3px solid var(--color-primary);
    padding-bottom: 10px;
    margin-bottom: 25px;
}
.product-list {
    display: grid !important;
    grid-template-columns: repeat(4, 1fr) !important;
    gap: 20px;
    width: 100%;
    max-width: 100%;
}
.product-item {
    background: var(--color-white);
    border: 1px solid #eee;
    border-radius: 8px;
    padding: 20px;
    text-align: center;
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
    display: flex;
    flex-direction: column;
    width: 100%;
    box-sizing: border-box;

    /* --- ★追加 2. カードホバー --- */
    transition: transform 0.3s ease-out, box-shadow 0.3s ease-out;
}
/* --- ★追加 2. カードホバー --- */
.product-item:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 20px rgba(0,0,0,0.08);
}

.product-image-slider {
    position: relative;
    overflow: hidden;
    background-color: #eee;
    border-radius: 8px;
    margin: 0 auto 15px auto;
}
.product-image-slider.small {
    width: 150px;
    height: 150px;
}
.product-image-slider img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: contain;
    opacity: 0;
    transition: opacity 0.5s ease-in-out;
    animation: fadeSlider 6s infinite; 
}
.product-image-slider img:nth-child(2) {
    animation-delay: 3s;
}

.product-text {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}
.product-text p {
    font-weight: 700;
    margin: 0;
}
.product-description {
    font-size: 0.9rem;
    font-weight: 400 !important;
    color: #333;
    text-align: left;
    margin-top: 10px !important;
    line-height: 1.6;
    flex-grow: 1;
}
.product-item.large {
    display: flex;
    flex-direction: row;
    align-items: center;
    text-align: left;
    padding: 30px;
}
.product-item.large .product-image-slider {
    width: 250px;
    height: 250px;
    margin: 0 30px 0 0;
    flex-shrink: 0;
}
.product-item.large .product-text p {
    font-size: 1.3rem;
}


/* --- (Where) Stores セクション --- */
.stores > .container > p {
    text-align: center;
    margin-bottom: 30px;
}
.store-logos {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 30px;
    margin-bottom: 30px;
    flex-wrap: wrap;
}
.store-logos img {
    max-height: 50px;
    width: auto;
    object-fit: contain;
}

.store-list {
    background: var(--color-white);
    border: 1px solid #ddd;
    border-radius: 8px;
    margin-bottom: 15px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
}
.store-list summary {
    font-size: 1.2rem;
    font-weight: 700;
    padding: 15px 20px;
    cursor: pointer;
    list-style: none;
    position: relative;
}
.store-list summary::-webkit-details-marker {
    display: none;
}
.store-list summary::after {
    content: '+';
    font-size: 1.5rem;
    color: var(--color-primary);
    position: absolute;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
    transition: transform 0.2s;
}
.store-list[open] summary::after {
    content: '−';
}

/* --- ▼▼▼ 修正箇所：店舗リストのズレを修正 ▼▼▼ --- */
.store-list ul {
    list-style-type: none;
    padding: 20px; /* 0 20px 20px 20px から変更 */
    margin: 0;
    border-top: 1px solid #eee;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px 20px; /* 行間10px, 列間20px */
}
.store-list li {
    padding: 0; /* 5px 0 から変更 */
    font-size: 0.9rem;
}
/* --- ▲▲▲ 修正箇所ここまで ▲▲▲ --- */

.store-list li a {
    text-decoration: underline;
    transition: color 0.2s;
}
.store-list li a:hover {
    color: var(--color-secondary);
    text-decoration-color: var(--color-secondary);
}

/* --- CTAセクション --- */
.cta {
    text-align: center;
    background-color: var(--color-primary) !important;
    color: var(--color-white);
}
.cta h2 {
    color: var(--color-white);
}
.cta p {
    font-size: 1.1rem;
    margin-bottom: 30px;
}
.btn-cta-override {
    background-color: var(--color-white) !important;
    color: var(--color-primary) !important;
}
.btn-cta-override:hover {
    background-color: var(--color-highlight) !important;
    color: var(--color-text) !important;
}

/* --- Terms セクション --- */
.terms-details {
    background: var(--color-white);
    border: 1px solid #ddd;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
}
.terms-details summary {
    font-size: 1.2rem;
    font-weight: 700;
    padding: 15px 20px;
    cursor: pointer;
    list-style: none;
    position: relative;
}
.terms-details summary::-webkit-details-marker {
    display: none;
}
.terms-details summary::after {
    content: '+';
    font-size: 1.5rem;
    color: var(--color-primary);
    position: absolute;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
}
.terms-details[open] summary::after {
    content: '−';
}
.terms-content {
    padding: 20px;
    border-top: 1px solid #eee;
    line-height: 1.8;
}
.terms-content h4 {
    font-size: 1.2rem;
    color: var(--color-primary);
    margin-top: 20px;
    margin-bottom: 10px;
}
.terms-content h4:first-child {
    margin-top: 0;
}
.terms-content p {
    margin-bottom: 10px;
}
.terms-content dl {
    margin-left: 20px;
}
.terms-content dt {
    font-weight: 700;
    margin-top: 10px;
}
.terms-content dd {
    margin-left: 20px;
    margin-bottom: 10px;
}

/* --- Footer --- */
.footer {
    background-color: var(--color-text);
    color: var(--color-white);
    padding: 40px 0 20px 0;
}
.disclaimer {
    font-size: 0.85rem;
    text-align: center;
    margin-bottom: 20px;
    opacity: 0.8;
}
.citation-block {
    margin-bottom: 30px;
}
.citation-header {
    font-weight: 700;
    margin-bottom: 10px;
}
.citation-block ul {
    list-style: none;
    padding: 0;
    margin: 0;
}
.citation-block li {
    margin-bottom: 8px;
    font-size: 0.9rem;
}
.citation-block a {
    color: #4db8ff;
    text-decoration: underline;
}
.citation-block a:hover {
    color: var(--color-secondary);
}
.copyright {
    text-align: center;
    font-size: 0.85rem;
    margin: 0;
    padding-top: 20px;
    border-top: 1px solid rgba(255,255,255,0.2);
    opacity: 0.7;
}

/* =================================================
   📱 レスポンシブデザイン（タブレット・スマホ対応）
================================================= */

/* --- ★修正：900px以下をタブレット扱いに変更 --- */
@media (max-width: 900px) {
    body {
        padding-top: 60px;
    }
    
    .header {
        padding: 8px 0;
    }
    
    .header h1 {
        font-size: 0.9rem;
    }
    
    /* PC用ナビを非表示 */
    .global-nav {
        display: none;
    }
    
    /* スマホ用ハンバーガーボタンを表示 */
    .menu-toggle-btn {
        display: block;
    }
    
    .global-nav-sp {
        top: 60px;
        height: calc(100vh - 60px);
    }
    
    h2 { font-size: 1.6rem; }
    h3 { font-size: 1.4rem; }
    
    .hero h2 {
        font-size: 1.6rem;
    }
    
    .hero .main-catchphrase {
        font-size: 1.2rem;
    }
    
    .hero .campaign-period {
        font-size: 1.1rem;
    }
    
    .about-flex {
        flex-direction: column;
    }
    
    .about-card {
        min-width: 100%;
    }
    
    .icon-plus {
        transform: rotate(90deg);
    }
    
    .how-to-box {
        flex-direction: column;
        text-align: center;
    }
    
    .how-to-image {
        flex: none;
        margin: 0 auto 20px auto;
    }
    
    .prize-structure {
        flex-direction: column;
    }
    
    .prize-tier {
        width: 100%;
    }
    
    .prize-content-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .product-item.large {
        flex-direction: column;
        text-align: center;
    }
    
    .product-item.large .product-image-slider {
        margin: 0 auto 20px auto;
    }
    
    .store-list ul {
        grid-template-columns: 1fr;
        gap: 8px;
    }
    
    .btn-large {
        font-size: 1rem;
        padding: 12px 30px;
    }
}

/* --- スマホ (480px以下) --- */
@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    section {
        padding: 40px 0;
    }
    
    .hero {
        padding: 40px 0 60px 0;
    }
    
    h2 { font-size: 1.4rem; }
    h3 { font-size: 1.2rem; }
    
    .hero h2 {
        font-size: 1.4rem;
    }
    
    .hero .main-catchphrase {
        font-size: 1rem;
    }
    
    .hero .campaign-period {
        font-size: 1rem;
        padding: 4px 12px;
    }
    
    .btn {
        padding: 10px 20px;
        font-size: 0.9rem;
    }
    
    .btn-large {
        font-size: 0.95rem;
        padding: 12px 25px;
    }
    
    .product-list {
        grid-template-columns: 1fr;
        max-width: 100%;
    }
    
    .prize-header h4 {
        font-size: 1rem;
        height: auto;
        min-height: 3.3em;
    }
    
    .prize-value {
        font-size: 1.5rem;
    }
    
    .prize-tier.tier-1 .prize-value {
        font-size: 1.8rem;
    }
    
    .store-logos {
        flex-direction: column;
        gap: 20px;
    }
}