:root {
    --primary-color: #4f46e5;
    --primary-hover: #4338ca;
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-main: #1e293b;
    --text-muted: #64748b;
    --border-color: #e2e8f0;
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --transition: all 0.3s ease;
    --success-bg: #ecfdf5;
    --success-text: #059669;
}

/* サーバー広告対策（必要に応じて） */
body > div:first-child[style*="text-align: center"] {
    display: none !important;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', 'Noto Sans JP', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

header {
    text-align: center;
    margin-bottom: 3rem;
}

header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

header p {
    color: var(--text-muted);
}

/* 検索フォーム */
.search-section {
    margin-bottom: 3rem;
}

.search-form {
    max-width: 700px;
    margin: 0 auto;
}

.input-group {
    display: flex;
    gap: 0.5rem;
    background: var(--card-bg);
    padding: 0.5rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
}

#searchInput {
    flex: 1;
    border: none;
    padding: 0.8rem 1.2rem;
    font-size: 1.1rem;
    border-radius: 8px;
    outline: none;
}

#searchButton {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 0.8rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

#searchButton:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
}

/* 検索結果 */
.results-count {
    margin-bottom: 1rem;
    font-weight: 600;
    color: var(--text-muted);
}

.results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

.product-card {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
}

.product-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 15px -3px rgb(0 0 0 / 0.1);
}

.product-genre {
    font-size: 0.8rem;
    color: var(--primary-color);
    text-transform: uppercase;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.product-title {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.product-author {
    font-size: 0.95rem;
    color: var(--text-main);
    margin-bottom: 1rem;
}

.product-info {
    margin-top: auto;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
    font-size: 0.9rem;
    color: var(--text-muted);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
}

.product-price {
    font-weight: 700;
    color: var(--text-main);
    grid-column: span 2;
    font-size: 1.1rem;
    margin-bottom: 0.2rem;
}

/* ページネーション */
.pagination-section {
    margin-top: 3rem;
    display: flex;
    justify-content: center;
    gap: 0.5rem;
}

.page-btn {
    padding: 0.6rem 1.2rem;
    border: 1px solid var(--border-color);
    background: var(--card-bg);
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
}

.page-btn:hover:not(:disabled) {
    background: var(--primary-color);
    color: white;
}

.page-btn.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.page-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* ローディング */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.8);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.hidden {
    display: none;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 5px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* 在庫状況 styles */
.product-stock {
    grid-column: span 2;
    margin-top: 1rem;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.6rem;
}

.stock-item {
    font-size: 0.75rem;
    padding: 0.5rem 0.6rem;
    border-radius: 8px;
    background: #f8fafc;
    border: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition);
}

/* 在庫がある店舗（.stock-inが含まれる親要素）の強調 */
.stock-item:has(.stock-in) {
    background-color: var(--success-bg);
    border-color: #a7f3d0;
}

.stock-name {
    color: var(--text-muted);
    font-size: 0.65rem;
    font-weight: 600;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 75%;
}

.stock-status {
    font-weight: 800;
    font-size: 0.75rem;
    white-space: nowrap;
}

.stock-in {
    color: var(--success-text);
}

.stock-out {
    color: #94a3b8;
}

@media (max-width: 640px) {
    .input-group {
        flex-direction: column;
    }
    
    #searchButton {
        width: 100%;
        justify-content: center;
    }

    .product-stock {
        grid-template-columns: 1fr;
    }
    
    .stock-item {
        padding: 0.7rem;
    }
}