/* リセット & 基本スタイル */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* ライトテーマ */
    --color-primary: #0052CC;
    --color-primary-hover: #0747A6;
    --color-secondary: #42526E;
    --color-success: #00875A;
    --color-warning: #FF991F;
    --color-danger: #DE350B;
    --color-info: #0065FF;
    
    --bg-primary: #FFFFFF;
    --bg-secondary: #F4F5F7;
    --bg-tertiary: #FAFBFC;
    
    --text-primary: #172B4D;
    --text-secondary: #5E6C84;
    --text-tertiary: #7A869A;
    
    --border-color: #DFE1E6;
    --border-radius: 8px;
    --shadow-sm: 0 1px 3px rgba(9, 30, 66, 0.13);
    --shadow-md: 0 4px 8px rgba(9, 30, 66, 0.13);
    --shadow-lg: 0 8px 16px rgba(9, 30, 66, 0.13);
    
    --transition: all 0.2s ease;
}

/* ダークテーマ */
body.theme-dark {
    --color-primary: #4C9AFF;
    --color-primary-hover: #2684FF;
    --color-secondary: #8993A4;
    --color-success: #57D9A3;
    --color-warning: #FFC400;
    --color-danger: #FF5630;
    
    --bg-primary: #1B2638;
    --bg-secondary: #253858;
    --bg-tertiary: #2C3E5D;
    
    --text-primary: #FFFFFF;
    --text-secondary: #B3BAC5;
    --text-tertiary: #8993A4;
    
    --border-color: #344563;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
    font-size: 14px;
    line-height: 1.5;
    color: var(--text-primary);
    background: var(--bg-secondary);
    transition: var(--transition);
}

.container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ヘッダー */
.header {
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow-sm);
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

.logo-icon {
    color: var(--color-primary);
}

.header-controls {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.language-selector {
    padding: 0.5rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 0.875rem;
    cursor: pointer;
    transition: var(--transition);
}

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

/* メインコンテンツ */
.main-content {
    flex: 1;
    padding: 2rem;
    max-width: 1200px;
    width: 100%;
    margin: 0 auto;
}

/* カード */
.card {
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
    margin-bottom: 1.5rem;
    transition: var(--transition);
}

.card:hover {
    box-shadow: var(--shadow-md);
}

/* フォーム */
.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.form-input,
.form-select {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 0.875rem;
    transition: var(--transition);
}

.form-input:focus,
.form-select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(0, 82, 204, 0.1);
}

.form-select-small {
    padding: 0.5rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 0.875rem;
    cursor: pointer;
}

/* ボタン */
.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--border-radius);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

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

.btn-primary:hover {
    background: var(--color-primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

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

.btn-icon {
    padding: 0.5rem;
    background: transparent;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
}

.btn-icon:hover {
    background: var(--bg-secondary);
    color: var(--color-primary);
}

/* 追跡リスト */
.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.filter-controls {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.tracking-items {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.tracking-item {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 1rem;
    transition: var(--transition);
}

.tracking-item:hover {
    box-shadow: var(--shadow-sm);
    transform: translateX(2px);
}

.tracking-item.status-pending {
    border-left: 4px solid var(--color-secondary);
}

.tracking-item.status-transit {
    border-left: 4px solid var(--color-info);
}

.tracking-item.status-delivered {
    border-left: 4px solid var(--color-success);
}

.tracking-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1rem;
}

.tracking-info h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.tracking-meta {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.carrier-badge {
    padding: 0.25rem 0.75rem;
    background: var(--color-primary);
    color: white;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 500;
}

.tracking-number {
    color: var(--text-secondary);
    font-family: 'Courier New', monospace;
    font-size: 0.875rem;
}

.tracking-actions {
    display: flex;
    gap: 0.5rem;
}

.tracking-status {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.status-badge {
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    font-weight: 500;
    font-size: 0.875rem;
}

.status-badge.status-pending {
    background: var(--bg-secondary);
    color: var(--text-secondary);
}

.status-badge.status-transit {
    background: rgba(0, 101, 255, 0.1);
    color: var(--color-info);
}

.status-badge.status-delivered {
    background: rgba(0, 135, 90, 0.1);
    color: var(--color-success);
}

.tracking-details {
    display: flex;
    gap: 2rem;
    flex-wrap: wrap;
}

.detail-item {
    display: flex;
    gap: 0.5rem;
    font-size: 0.875rem;
}

.detail-label {
    color: var(--text-tertiary);
}

.status-history {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.history-item {
    display: flex;
    justify-content: space-between;
    padding: 0.5rem 0;
    font-size: 0.8125rem;
    color: var(--text-secondary);
}

.empty-state {
    text-align: center;
    padding: 3rem;
    color: var(--text-tertiary);
}

/* 統計セクション */
.stats-section {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-top: 2rem;
}

.stat-card {
    text-align: center;
    padding: 1.5rem;
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 0.5rem;
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* モーダル */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    width: 90%;
    max-width: 500px;
    box-shadow: var(--shadow-lg);
}

.modal-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    font-size: 1.25rem;
    font-weight: 600;
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-secondary);
    padding: 0;
    width: 2rem;
    height: 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.modal-close:hover {
    background: var(--bg-secondary);
}

.modal-body {
    padding: 1.5rem;
}

.modal-footer {
    padding: 1.5rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    cursor: pointer;
    padding: 0.5rem 0;
}

.checkbox-label input[type="checkbox"] {
    width: 1.25rem;
    height: 1.25rem;
    cursor: pointer;
}

/* フッター */
.footer {
    background: var(--bg-primary);
    border-top: 1px solid var(--border-color);
    padding: 1.5rem 2rem;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* レスポンシブ */
@media (max-width: 768px) {
    .header {
        padding: 1rem;
    }
    
    .main-content {
        padding: 1rem;
    }
    
    .tracking-header {
        flex-direction: column;
        gap: 1rem;
    }
    
    .tracking-actions {
        width: 100%;
        justify-content: flex-end;
    }
    
    .section-header {
        flex-direction: column;
        gap: 1rem;
        align-items: stretch;
    }
    
    .filter-controls {
        flex-direction: column;
    }
    
    .tracking-details {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .stats-section {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .logo {
        font-size: 1.25rem;
    }
    
    .header-controls {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .stats-section {
        grid-template-columns: 1fr;
    }
}