/* --- 基本設定とカスタムプロパティ --- */
:root {
    --bg-color: #fff7fa; /* 淡いピンクの背景 */
    --card-bg-color: #ffffff;
    --primary-color: #ff7eb3; /* メインのピンク */
    --primary-hover-color: #ff5c9d;
    --accent-color: #a2d2ff; /* アクセントのライトブルー */
    --text-color: #4f4f4f;
    --text-color-light: #8b8b8b;
    --font-heading: 'M PLUS Rounded 1c', 'Noto Sans JP', sans-serif;
    --font-body: 'Noto Sans JP', sans-serif;
    --shadow: 0 4px 15px rgba(255, 126, 179, 0.1);
    --radius: 16px;
    --transition: 0.3s ease-in-out;
}

/* --- 基本スタイルとリセット --- */
body {
    margin: 0;
    font-family: var(--font-body);
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}

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

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

/* --- ヘッダー --- */
.site-header {
    background: linear-gradient(135deg, #ffffff, #fff0f5);
    padding: 25px 0;
    text-align: center;
    border-bottom: 1px solid #ffe5ee;
}

.site-logo {
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--primary-color);
    letter-spacing: 1px;
    margin: 0;
}

.site-tagline {
    font-size: 1rem;
    color: var(--text-color-light);
    margin-top: 5px;
}

/* --- Search Box --- */
#search-box {
    padding: 20px 0;
    text-align: center;
}

#search-input {
    width: 100%;
    max-width: 600px;
    padding: 12px 20px;
    border: 1px solid #ffe5ee;
    border-radius: 25px;
    font-size: 1rem;
    font-family: var(--font-body);
    transition: var(--transition);
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

#search-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 4px 12px rgba(255, 126, 179, 0.2);
}

/* --- タグフィルター --- */
#tag-filter {
    padding: 30px 0;
    text-align: center;
}

.tag-filter-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
}

.tag-filter-btn {
    background-color: #fff;
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
    padding: 8px 16px;
    border-radius: 20px;
    cursor: pointer;
    transition: var(--transition);
    font-weight: 700;
}

.tag-filter-btn:hover, .tag-filter-btn.active {
    background-color: var(--primary-color);
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(255, 126, 179, 0.3);
}

/* --- レビューカード --- */
.reviews-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 35px;
}

.review-card {
    background-color: var(--card-bg-color);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    overflow: hidden;
    transition: var(--transition);
    opacity: 1;
    transform: scale(1);
}

.review-card.hidden {
    opacity: 0;
    transform: scale(0.95);
    height: 0;
    margin: 0;
    padding: 0;
    border: 0;
    overflow: hidden;
}

.review-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(255, 126, 179, 0.15);
}

.review-card-content {
    padding: 30px;
}

.review-card-title a {
    font-size: 1.6rem;
    color: var(--text-color);
    text-decoration: none;
}
.review-card-title a:hover {
    color: var(--primary-color);
}

.review-card h4 {
    font-size: 1.1rem;
    color: var(--primary-color);
    margin: 20px 0 8px;
    border-left: 4px solid var(--accent-color);
    padding-left: 10px;
}

.review-card-tags {
    margin: 15px 0;
}

.tag {
    display: inline-block;
    background-color: #eff8ff;
    color: var(--accent-color);
    border: 1px solid var(--accent-color);
    padding: 4px 12px;
    border-radius: 15px;
    font-size: 0.8rem;
    font-weight: 700;
    margin-right: 8px;
    margin-bottom: 8px;
}

.review-card-footer {
    margin-top: 25px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.share-btn-x {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background-color: #000;
    color: #fff;
    padding: 8px 18px;
    border-radius: 20px;
    font-weight: 700;
    text-decoration: none;
    transition: var(--transition);
}

.share-btn-x:hover {
    background-color: #333;
    transform: scale(1.05);
}

.amazon-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background-color: #ff9900;
    color: #fff;
    padding: 8px 18px;
    border-radius: 20px;
    font-weight: 700;
    text-decoration: none;
    transition: var(--transition);
}

.amazon-link:hover {
    background-color: #e68a00;
    transform: scale(1.05);
}

/* --- その他 --- */
.intro-text {
    text-align: center;
    padding: 20px;
    margin-bottom: 40px;
    background-color: var(--card-bg-color);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.intro-text h2 {
    color: var(--primary-color);
}

/* --- フッター --- */
.site-footer {
    background-color: #4f4f4f;
    color: #f0f0f0;
    padding: 40px 0;
    text-align: center;
    margin-top: 50px;
}

.footer-social-links a {
    color: #fff;
    font-size: 24px;
    margin: 0 10px;
    transition: var(--transition);
}
.footer-social-links a:hover {
    color: var(--primary-color);
}

.copyright {
    margin-top: 15px;
    font-size: 0.9rem;
    color: #aaa;
}

/* --- トップに戻るボタン --- */
#back-to-top {
    position: fixed;
    bottom: 25px;
    right: 25px;
    width: 45px;
    height: 45px;
    background-color: var(--primary-color);
    color: #fff;
    border-radius: 50%;
    text-align: center;
    line-height: 45px;
    font-size: 20px;
    cursor: pointer;
    display: none;
    z-index: 100;
    box-shadow: 0 2px 10px rgba(0,0,0,0.2);
    transition: var(--transition);
}

#back-to-top:hover {
    background-color: var(--primary-hover-color);
    transform: scale(1.1);
}