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

:root {
    --primary-color: #4CAF50;
    --secondary-color: #2196F3;
    --danger-color: #f44336;
    --warning-color: #ff9800;
    --success-color: #4CAF50;
    --bg-color: #f5f7fa;
    --card-bg: #ffffff;
    --text-primary: #2c3e50;
    --text-secondary: #718096;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.12);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 15px rgba(0,0,0,0.1);
    --border-radius: 12px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: var(--text-primary);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

header {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    padding: 20px 30px;
    margin-bottom: 30px;
    box-shadow: var(--shadow-md);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.app-title {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 28px;
    font-weight: 700;
    color: var(--primary-color);
}

.app-title .icon {
    font-size: 36px;
}

.language-selector {
    padding: 8px 16px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    background: var(--card-bg);
    font-size: 14px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.language-selector:hover {
    border-color: var(--primary-color);
}

/* 統計ダッシュボード */
.stats-dashboard {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    padding: 20px;
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: transform 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.stat-value {
    font-size: 36px;
    font-weight: 700;
    color: var(--primary-color);
}

.stat-card.warning .stat-value {
    color: var(--warning-color);
}

.stat-card.danger .stat-value {
    color: var(--danger-color);
}

.stat-label {
    font-size: 14px;
    color: var(--text-secondary);
    margin-top: 5px;
}

/* セクション */
section {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    padding: 25px;
    margin-bottom: 25px;
    box-shadow: var(--shadow-sm);
}

section h2 {
    font-size: 20px;
    margin-bottom: 20px;
    color: var(--text-primary);
}

/* ボタン */
.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), #45a049);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(76, 175, 80, 0.3);
}

.btn-secondary {
    background: var(--bg-color);
    color: var(--text-primary);
    border: 2px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--border-color);
}

.btn-danger {
    background: var(--danger-color);
    color: white;
}

.btn-icon {
    background: none;
    border: none;
    font-size: 20px;
    cursor: pointer;
    padding: 5px;
    transition: transform 0.2s;
}

.btn-icon:hover {
    transform: scale(1.2);
}

/* 追加メソッド */
.add-methods {
    display: flex;
    gap: 15px;
    margin-bottom: 20px;
}

/* スキャナー */
.scanner-container {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.9);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
}

.scanner-video {
    max-width: 100%;
    max-height: 80vh;
}

.scanner-overlay {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    pointer-events: none;
}

.scanner-frame {
    width: 250px;
    height: 250px;
    border: 3px solid var(--primary-color);
    border-radius: 10px;
    animation: scan 2s infinite;
}

@keyframes scan {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.scanner-close {
    position: absolute;
    top: 20px;
    right: 20px;
}

/* フォーム */
.add-item-form {
    background: var(--bg-color);
    padding: 20px;
    border-radius: 10px;
    margin-top: 20px;
}

.form-group {
    margin-bottom: 15px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: 600;
    color: var(--text-primary);
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 10px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
    transition: border-color 0.3s;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

.form-actions {
    display: flex;
    gap: 10px;
    justify-content: flex-end;
    margin-top: 20px;
}

/* フィルター */
.filter-section {
    background: transparent;
    padding: 0;
    margin-bottom: 20px;
    box-shadow: none;
}

.filter-controls {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
}

.search-input,
.category-filter,
.sort-select {
    padding: 10px 15px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    background: var(--card-bg);
    font-size: 14px;
    transition: border-color 0.3s;
}

.search-input {
    flex: 1;
    min-width: 200px;
}

.search-input:focus,
.category-filter:focus,
.sort-select:focus {
    outline: none;
    border-color: var(--primary-color);
}

/* アイテムグリッド */
.items-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}

.item-card {
    background: var(--bg-color);
    border-radius: 10px;
    padding: 15px;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.item-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.item-card.expiring-soon {
    border-color: var(--warning-color);
    background: linear-gradient(135deg, #fff8e1 0%, #ffecb3 100%);
}

.item-card.expired {
    border-color: var(--danger-color);
    background: linear-gradient(135deg, #ffebee 0%, #ffcdd2 100%);
}

.item-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 10px;
}

.item-icon {
    font-size: 24px;
}

.item-name {
    flex: 1;
    font-size: 16px;
    font-weight: 600;
}

.item-quantity {
    color: var(--text-secondary);
    font-size: 14px;
}

.item-info {
    margin-bottom: 10px;
}

.expiry-info {
    display: flex;
    justify-content: space-between;
    margin-bottom: 5px;
    font-size: 14px;
}

.expiry-type {
    color: var(--text-secondary);
}

.expiry-date {
    font-weight: 600;
}

.days-remaining {
    font-size: 12px;
    color: var(--primary-color);
    font-weight: 600;
}

.days-remaining.overdue {
    color: var(--danger-color);
}

.item-actions {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
    padding-top: 10px;
    border-top: 1px solid var(--border-color);
}

/* 買い物リスト */
.shopping-list {
    background: var(--bg-color);
    padding: 20px;
    border-radius: 10px;
    margin-top: 20px;
}

.shopping-list h3 {
    margin-bottom: 15px;
    color: var(--primary-color);
}

.shopping-list-items {
    list-style: none;
}

.category-group {
    margin-bottom: 15px;
}

.category-group strong {
    display: block;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.category-group ul {
    list-style: none;
    padding-left: 20px;
}

.category-group ul li {
    padding: 5px 0;
    color: var(--text-secondary);
}

.empty-message {
    text-align: center;
    color: var(--text-secondary);
    padding: 20px;
}

/* アラート */
.alert-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 2000;
}

.alert {
    background: var(--card-bg);
    padding: 15px 20px;
    border-radius: 8px;
    margin-bottom: 10px;
    box-shadow: var(--shadow-lg);
    animation: slideIn 0.3s ease;
    min-width: 250px;
}

.alert-success {
    border-left: 4px solid var(--success-color);
}

.alert-warning {
    border-left: 4px solid var(--warning-color);
}

.alert-error {
    border-left: 4px solid var(--danger-color);
}

.alert.fade-out {
    animation: fadeOut 0.3s ease;
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes fadeOut {
    to {
        opacity: 0;
        transform: translateX(100%);
    }
}

/* ユーティリティ */
.hidden {
    display: none !important;
}

/* レスポンシブ */
@media (max-width: 768px) {
    .container {
        padding: 10px;
    }
    
    .header-content {
        flex-direction: column;
        gap: 15px;
    }
    
    .app-title {
        font-size: 24px;
    }
    
    .stats-dashboard {
        grid-template-columns: 1fr;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .filter-controls {
        flex-direction: column;
    }
    
    .search-input {
        width: 100%;
    }
    
    .items-grid {
        grid-template-columns: 1fr;
    }
    
    .add-methods {
        flex-direction: column;
    }
    
    .add-methods .btn {
        width: 100%;
    }
}