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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", Helvetica, Arial, sans-serif;
    background: #ffffff;
    color: #1d1d1f;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

.header {
    background: #000000;
    padding: 12px 0;
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.header-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    height: 32px;
    width: auto;
}

.header-nav {
    display: flex;
    gap: 24px;
    align-items: center;
    flex-wrap: wrap;
}

.header-nav a {
    color: #f5f5f7;
    text-decoration: none;
    font-size: 14px;
    font-weight: 400;
    letter-spacing: -0.01em;
    transition: opacity 0.2s;
    white-space: nowrap;
}

.header-nav a:hover {
    opacity: 0.7;
}

.lang-toggle {
    background: transparent;
    border: 1px solid rgba(245, 245, 247, 0.3);
    color: #f5f5f7;
    padding: 6px 16px;
    border-radius: 20px;
    cursor: pointer;
    font-size: 13px;
    transition: all 0.2s;
    white-space: nowrap;
    writing-mode: horizontal-tb !important;
}

.lang-toggle:hover {
    background: rgba(245, 245, 247, 0.1);
    border-color: rgba(245, 245, 247, 0.5);
}

.btn-logout {
    background: transparent;
    border: 1px solid rgba(245, 245, 247, 0.3);
    color: #f5f5f7;
    padding: 6px 16px;
    border-radius: 20px;
    cursor: pointer;
    font-size: 13px;
    font-weight: 400;
    transition: all 0.2s;
}

.btn-logout:hover {
    background: rgba(245, 245, 247, 0.1);
    border-color: rgba(245, 245, 247, 0.5);
}

h1 {
    font-size: 48px;
    font-weight: 600;
    letter-spacing: -0.02em;
    color: #1d1d1f;
}

h2 {
    font-size: 32px;
    font-weight: 600;
    letter-spacing: -0.01em;
    color: #1d1d1f;
}

h3 {
    font-size: 24px;
    font-weight: 600;
    letter-spacing: -0.01em;
    color: #1d1d1f;
}

.btn-primary {
    background: #000000;
    color: #ffffff;
    border: none;
    padding: 12px 28px;
    border-radius: 24px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    letter-spacing: -0.01em;
}

.btn-primary:hover {
    background: #1d1d1f;
    transform: translateY(-1px);
}

.btn-secondary {
    background: #ffffff;
    color: #000000;
    border: 1px solid #d2d2d7;
    padding: 10px 24px;
    border-radius: 24px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    letter-spacing: -0.01em;
}

.btn-secondary:hover {
    background: #f5f5f7;
    border-color: #86868b;
}

.card {
    background: #ffffff;
    border: 1px solid #d2d2d7;
    border-radius: 18px;
    padding: 32px;
    transition: all 0.3s;
}

.card:hover {
    border-color: #86868b;
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
}

table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    background: #ffffff;
    border: 1px solid #d2d2d7;
    border-radius: 12px;
    overflow: hidden;
}

thead {
    background: #f5f5f7;
}

th {
    padding: 16px 20px;
    text-align: left;
    font-size: 13px;
    font-weight: 600;
    color: #1d1d1f;
    letter-spacing: -0.01em;
    text-transform: uppercase;
    border-bottom: 1px solid #d2d2d7;
}

td {
    padding: 16px 20px;
    font-size: 14px;
    color: #1d1d1f;
    border-bottom: 1px solid #f5f5f7;
}

tr:last-child td {
    border-bottom: none;
}

tr:hover {
    background: #fafafa;
}

.form-group {
    margin-bottom: 24px;
}

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    color: #1d1d1f;
    margin-bottom: 8px;
    letter-spacing: -0.01em;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid #d2d2d7;
    border-radius: 8px;
    font-size: 14px;
    font-family: inherit;
    color: #1d1d1f;
    transition: all 0.2s;
    background: #ffffff;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #000000;
    box-shadow: 0 0 0 3px rgba(0, 0, 0, 0.05);
}

.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(10px);
    z-index: 1000;
    animation: fadeIn 0.2s;
}

.modal.active {
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background: #ffffff;
    padding: 48px;
    border-radius: 18px;
    max-width: 600px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    animation: slideUp 0.3s;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideUp {
    from { transform: translateY(20px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

.badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 500;
    letter-spacing: -0.01em;
}

.badge-success {
    background: #f0f0f0;
    color: #1d1d1f;
}

.badge-warning {
    background: #e8e8e8;
    color: #1d1d1f;
}

.badge-danger {
    background: #d8d8d8;
    color: #1d1d1f;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 80px 40px;
}

@media (max-width: 1024px) {
    .header-nav {
        gap: 16px;
    }
    
    .header-nav a {
        font-size: 13px;
    }
    
    h1 {
        font-size: 36px;
    }
    
    .container {
        padding: 40px 20px;
    }
}

@media (max-width: 768px) {
    .header-container {
        padding: 0 20px;
        flex-direction: column;
        gap: 16px;
    }
    
    .header-nav {
        width: 100%;
        justify-content: center;
        flex-wrap: wrap;
        gap: 12px;
    }
    
    .header-nav a {
        font-size: 12px;
    }
    
    h1 {
        font-size: 28px;
    }
}

/* ============================================
   レスポンシブ対応(スマホ・iPad)
   ============================================ */

/* viewport 設定がない場合の備え - HTML側で <meta viewport> 必須 */

/* ===== iPad / タブレット (1024px以下) ===== */
@media (max-width: 1024px) {
    .header-container {
        padding: 0 20px;
    }
    
    .header-nav {
        gap: 16px;
    }
    
    .header-nav a {
        font-size: 13px;
    }
    
    h1 {
        font-size: 32px !important;
    }
    
    .container {
        padding: 20px !important;
    }
    
    /* テーブル横スクロール */
    table {
        display: block;
        overflow-x: auto;
        white-space: nowrap;
        -webkit-overflow-scrolling: touch;
    }
    
    /* グリッド系を2列に */
    .stats-grid,
    .info-grid,
    .summary,
    .actions-grid {
        grid-template-columns: repeat(2, 1fr) !important;
    }
    
    /* 商品グリッド: 3列 */
    .products-grid,
    .products-list {
        grid-template-columns: repeat(3, 1fr) !important;
    }
}

/* ===== スマホ (768px以下) ===== */
@media (max-width: 768px) {
    body {
        font-size: 14px;
    }
    
    /* ヘッダーを縦並び + 折り畳み */
    .header {
        padding: 8px 0;
    }
    
    .header-container {
        flex-direction: column;
        gap: 8px;
        padding: 0 12px;
    }
    
    .header-nav {
        gap: 8px;
        width: 100%;
        justify-content: center;
        overflow-x: auto;
        flex-wrap: nowrap;
        padding-bottom: 4px;
    }
    
    .header-nav a {
        font-size: 12px;
        flex-shrink: 0;
    }
    
    .logo {
        height: 24px;
    }
    
    h1 {
        font-size: 24px !important;
    }
    
    h2 {
        font-size: 20px !important;
    }
    
    h3 {
        font-size: 16px !important;
    }
    
    /* コンテナ */
    .container, .main {
        padding: 12px !important;
    }
    
    /* グリッドを1列に */
    .stats-grid,
    .info-grid,
    .summary,
    .actions-grid {
        grid-template-columns: 1fr !important;
        gap: 12px !important;
    }
    
    /* 商品グリッド: 2列 */
    .products-grid,
    .products-list {
        grid-template-columns: repeat(2, 1fr) !important;
        gap: 12px !important;
    }
    
    /* フォーム入力をタップしやすく */
    input, select, textarea, button {
        font-size: 16px !important;  /* iOS の zoom 防止 */
        min-height: 44px;
    }
    
    /* タッチターゲット最小44px */
    button, .btn, a.btn {
        min-height: 44px;
        padding: 10px 16px !important;
    }
    
    /* テーブルセル */
    th, td {
        padding: 8px !important;
        font-size: 13px !important;
    }
    
    /* カード */
    .card, .info-box, .stat-card {
        padding: 16px !important;
    }
    
    /* ボタングループは縦並び */
    .actions, .form-actions, .button-group, .buttons {
        flex-direction: column;
        gap: 8px;
    }
    
    .actions button, .form-actions button, .buttons button,
    .actions a, .form-actions a, .buttons a {
        width: 100%;
    }
    
    /* モーダル */
    .modal {
        width: 95% !important;
        max-width: 95% !important;
        padding: 16px !important;
    }
    
    /* フィルタ */
    .filters, .filter-bar {
        flex-direction: column;
        gap: 8px;
    }
    
    .filter-select, .filter-input {
        width: 100% !important;
        min-width: 0 !important;
    }
    
    /* 横並びフォーム → 縦並び */
    .form-inline {
        flex-direction: column;
    }
    
    /* スクロール可能なテーブル */
    table {
        font-size: 12px !important;
    }
}

/* ===== 印刷 ===== */
@media print {
    .header, .actions, button { display: none !important; }
    body { background: white; }
}