/**
 * Lazy Loading Styles
 * 遅延読み込み関連スタイル
 */

/* 遅延読み込み対象要素の基本スタイル */
.lazy-load {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease-out;
}

.lazy-load.loaded {
    opacity: 1;
    transform: translateY(0);
}

/* 画像の遅延読み込み */
.lazy-image {
    opacity: 0;
    transition: opacity 0.6s ease-in-out;
    background: #f0f0f0;
    min-height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.lazy-image.loaded {
    opacity: 1;
}

.lazy-image::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.4),
        transparent
    );
    transform: translateX(-100%);
    animation: shimmer 1.5s infinite;
    pointer-events: none;
}

.lazy-image.loaded::before {
    display: none;
}

@keyframes shimmer {
    0% {
        transform: translateX(-100%);
    }
    100% {
        transform: translateX(100%);
    }
}

/* プレースホルダー画像 */
.lazy-placeholder {
    position: relative;
    background: #f8f9fa;
    border: 2px dashed #dee2e6;
    color: #6c757d;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 200px;
}

.lazy-placeholder::after {
    content: '読み込み中...';
    font-style: italic;
}

/* ローディングスピナー */
.lazy-spinner {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 40px;
    height: 40px;
    border: 3px solid #f3f3f3;
    border-top: 3px solid #007bff;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.lazy-image.loaded .lazy-spinner {
    display: none;
}

@keyframes spin {
    0% { transform: translate(-50%, -50%) rotate(0deg); }
    100% { transform: translate(-50%, -50%) rotate(360deg); }
}

/* セクションの遅延読み込み */
.lazy-section {
    opacity: 0;
    transform: translateY(50px);
    transition: all 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.lazy-section.loaded {
    opacity: 1;
    transform: translateY(0);
}

/* カードの遅延読み込み */
.lazy-card {
    opacity: 0;
    transform: translateY(30px) scale(0.95);
    transition: all 0.6s ease-out;
}

.lazy-card.loaded {
    opacity: 1;
    transform: translateY(0) scale(1);
}

/* 段階的な遅延読み込み */
.lazy-stagger-1 { transition-delay: 0.1s; }
.lazy-stagger-2 { transition-delay: 0.2s; }
.lazy-stagger-3 { transition-delay: 0.3s; }
.lazy-stagger-4 { transition-delay: 0.4s; }
.lazy-stagger-5 { transition-delay: 0.5s; }

/* テキストの遅延読み込み */
.lazy-text {
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.5s ease-out;
}

.lazy-text.loaded {
    opacity: 1;
    transform: translateY(0);
}

/* フェードイン効果のバリエーション */
.lazy-fade-up {
    opacity: 0;
    transform: translateY(40px);
    transition: all 0.7s ease-out;
}

.lazy-fade-up.loaded {
    opacity: 1;
    transform: translateY(0);
}

.lazy-fade-down {
    opacity: 0;
    transform: translateY(-40px);
    transition: all 0.7s ease-out;
}

.lazy-fade-down.loaded {
    opacity: 1;
    transform: translateY(0);
}

.lazy-fade-left {
    opacity: 0;
    transform: translateX(-40px);
    transition: all 0.7s ease-out;
}

.lazy-fade-left.loaded {
    opacity: 1;
    transform: translateX(0);
}

.lazy-fade-right {
    opacity: 0;
    transform: translateX(40px);
    transition: all 0.7s ease-out;
}

.lazy-fade-right.loaded {
    opacity: 1;
    transform: translateX(0);
}

/* ズーム効果 */
.lazy-zoom {
    opacity: 0;
    transform: scale(0.8);
    transition: all 0.6s ease-out;
}

.lazy-zoom.loaded {
    opacity: 1;
    transform: scale(1);
}

/* 回転効果 */
.lazy-rotate {
    opacity: 0;
    transform: rotate(-10deg);
    transition: all 0.8s ease-out;
}

.lazy-rotate.loaded {
    opacity: 1;
    transform: rotate(0deg);
}

/* レスポンシブ対応 */
@media (max-width: 768px) {
    .lazy-load,
    .lazy-section,
    .lazy-card,
    .lazy-fade-up,
    .lazy-fade-down,
    .lazy-fade-left,
    .lazy-fade-right {
        transform: translateY(20px);
    }
    
    .lazy-image {
        min-height: 150px;
    }
    
    .lazy-placeholder {
        min-height: 150px;
        font-size: 0.8rem;
    }
}

@media (max-width: 480px) {
    .lazy-load,
    .lazy-section,
    .lazy-card,
    .lazy-fade-up,
    .lazy-fade-down {
        transform: translateY(15px);
    }
    
    .lazy-fade-left,
    .lazy-fade-right {
        transform: translateY(15px);
    }
    
    .lazy-image {
        min-height: 120px;
    }
}

/* アクセシビリティ対応 */
@media (prefers-reduced-motion: reduce) {
    .lazy-load,
    .lazy-image,
    .lazy-section,
    .lazy-card,
    .lazy-text,
    .lazy-fade-up,
    .lazy-fade-down,
    .lazy-fade-left,
    .lazy-fade-right,
    .lazy-zoom,
    .lazy-rotate {
        transition: none !important;
        transform: none !important;
        animation: none !important;
    }
    
    .lazy-spinner {
        animation: none !important;
    }
    
    .lazy-image::before {
        animation: none !important;
    }
}

/* 高コントラストモード対応 */
@media (prefers-contrast: high) {
    .lazy-placeholder {
        border-color: currentColor;
        background: transparent;
    }
    
    .lazy-spinner {
        border-color: currentColor;
        border-top-color: transparent;
    }
}

/* ダークモード対応 */
@media (prefers-color-scheme: dark) {
    .lazy-image {
        background: #2c2c2c;
    }
    
    .lazy-placeholder {
        background: #1a1a1a;
        border-color: #444;
        color: #ccc;
    }
    
    .lazy-spinner {
        border-color: #444;
        border-top-color: #007bff;
    }
}

/* パフォーマンス最適化 */
.lazy-load,
.lazy-image,
.lazy-section,
.lazy-card {
    will-change: opacity, transform;
}

.lazy-load.loaded,
.lazy-image.loaded,
.lazy-section.loaded,
.lazy-card.loaded {
    will-change: auto;
}