/* リセット・基本設定 */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Helvetica Neue', Arial, 'Hiragino Kaku Gothic ProN', Meiryo, sans-serif;
    color: #333;
    background-color: #faf9f7;
    line-height: 1.8;
}

a {
    color: inherit;
    text-decoration: none;
}

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

/* ヘッダー */
.site-header {
    background-color: #fff;
    border-bottom: 1px solid #e8e0d8;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-inner {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 24px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    font-size: 1.4rem;
    letter-spacing: 0.2em;
    color: #8b6f5e;
    font-weight: 300;
}

.header-nav {
    display: flex;
    gap: 32px;
    font-size: 0.85rem;
    letter-spacing: 0.05em;
}

.header-nav a:hover {
    color: #8b6f5e;
}

/* メインコンテンツ */
.main-content {
    min-height: calc(100vh - 64px - 120px);
    max-width: 1100px;
    margin: 0 auto;
    padding: 48px 24px;
}

/* フッター */
.site-footer {
    background-color: #2c2420;
    color: #c8b8b0;
    padding: 40px 24px;
    text-align: center;
}

.footer-inner {
    max-width: 1100px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
}

.site-footer .logo {
    color: #e8d8d0;
    font-size: 1.2rem;
}

.footer-nav {
    display: flex;
    gap: 24px;
    font-size: 0.8rem;
}

.footer-nav a:hover {
    color: #fff;
}

.copyright {
    font-size: 0.75rem;
    color: #8a7a74;
}

/* ボタン */
.btn {
    display: inline-block;
    padding: 12px 32px;
    border: none;
    cursor: pointer;
    font-size: 0.9rem;
    letter-spacing: 0.1em;
    transition: opacity 0.2s;
}

.btn:hover {
    opacity: 0.8;
}

.btn-primary {
    background-color: #8b6f5e;
    color: #fff;
}

.btn-secondary {
    background-color: transparent;
    color: #8b6f5e;
    border: 1px solid #8b6f5e;
}

.btn-danger {
    background-color: #c0392b;
    color: #fff;
}

/* フォーム */
.form-group {
    margin-bottom: 24px;
}

.form-group label {
    display: block;
    font-size: 0.85rem;
    margin-bottom: 8px;
    color: #666;
    letter-spacing: 0.05em;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid #ddd;
    background-color: #fff;
    font-size: 1rem;
    outline: none;
    transition: border-color 0.2s;
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: #8b6f5e;
}

/* アラート */
.alert {
    padding: 12px 16px;
    margin-bottom: 24px;
    font-size: 0.9rem;
}

.alert-error {
    background-color: #fdf0ee;
    color: #c0392b;
    border-left: 3px solid #c0392b;
}

.alert-success {
    background-color: #f0fdf4;
    color: #27ae60;
    border-left: 3px solid #27ae60;
}

/* 商品一覧 */
.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 32px;
}

.product-card {
    background-color: #fff;
    border: 1px solid #e8e0d8;
    transition: box-shadow 0.2s;
}

.product-card:hover {
    box-shadow: 0 4px 16px rgba(0,0,0,0.08);
}

.product-card img {
    width: 100%;
    aspect-ratio: 1;
    object-fit: cover;
}

.product-card-body {
    padding: 20px;
}

.product-card-name {
    font-size: 1rem;
    margin-bottom: 8px;
    letter-spacing: 0.05em;
}

.product-card-price {
    color: #8b6f5e;
    font-size: 1.1rem;
    margin-bottom: 16px;
}

/* ページタイトル */
.page-title {
    font-size: 1.5rem;
    font-weight: 300;
    letter-spacing: 0.15em;
    margin-bottom: 40px;
    padding-bottom: 16px;
    border-bottom: 1px solid #e8e0d8;
    color: #4a3828;
}

/* テーブル */
.table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

.table th,
.table td {
    padding: 12px 16px;
    border-bottom: 1px solid #e8e0d8;
    text-align: left;
}

.table th {
    background-color: #f5f0eb;
    color: #666;
    font-weight: normal;
    letter-spacing: 0.05em;
}

/* レスポンシブ */
@media (max-width: 768px) {
    .header-nav {
        gap: 12px;
        font-size: 0.75rem;
    }

    .product-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }

    .main-content {
        padding: 32px 16px;
    }

    /* checkout の2カラムを1カラムに */
    .main-content > div[style*="grid-template-columns:1fr 380px"] {
        display: block !important;
    }

    .main-content > div[style*="grid-template-columns:1fr 380px"] > div:last-child {
        margin-top: 32px;
    }

    /* 商品詳細の2カラムを1カラムに */
    .main-content > div[style*="grid-template-columns:1fr 1fr"] {
        display: block !important;
    }

    .main-content > div[style*="grid-template-columns:1fr 1fr"] > div:last-child {
        margin-top: 24px;
    }

    /* カートテーブルをカード型に */
    .table thead {
        display: none;
    }

    .table tr {
        display: block;
        border-bottom: 1px solid #e8e0d8;
        padding: 16px 0;
    }

    .table td {
        display: block;
        border-bottom: none;
        padding: 4px 0;
    }
}

@media (max-width: 480px) {
    .header-inner {
        padding: 0 16px;
    }

    .logo {
        font-size: 1.1rem;
    }

    .header-nav {
        gap: 8px;
        font-size: 0.7rem;
    }

    .product-grid {
        grid-template-columns: 1fr;
    }
}