.section {
    background: var(--section-bg-color);
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
    margin-bottom: 2rem;
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.section-header {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    color: white;
    padding: 1rem;
    margin: 0;
    font-size: 1.5rem;
    font-weight: 600;
}

.section-content {
    padding: 1.5rem;
}

.screenshot-item img {
    width: 100%;
    height: 150px;
    object-fit: cover;
}

/* スクリーンショットギャラリー */
.screenshot-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

.screenshot-item {
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
    cursor: pointer;
}

.introduction {
    display: -webkit-box;
    -webkit-line-clamp: 3; /* 最初は3行まで表示 */
    -webkit-box-orient: vertical;
    overflow: hidden;
    transition: all 0.3s;
}

.introduction.expanded {
    -webkit-line-clamp: unset;
    overflow: visible;
}

.introduction img {
   max-width: 100%;
}

/* アクセシビリティのためのスタイル */
.visually-hidden {
    position: absolute !important;
    width: 1px !important;
    height: 1px !important;
    padding: 0 !important;
    margin: -1px !important;
    overflow: hidden !important;
    clip: rect(0, 0, 0, 0) !important;
    white-space: nowrap !important;
    border: 0 !important;
}

/* フォーカス時のスタイル改善 */
.btn:focus,
.btn-link:focus {
    outline: 2px solid #007bff;
    outline-offset: 2px;
}

/* 画像の遅延読み込み */
img[loading="lazy"] {
    opacity: 0;
    transition: opacity 0.3s;
}

img[loading="lazy"].loaded {
    opacity: 1;
}