/* リセットとベース設定 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* カラーパレット - Atlassian Design System inspired */
    --primary-color: #0052CC;
    --primary-hover: #0747A6;
    --secondary-color: #6B778C;
    --success-color: #00875A;
    --danger-color: #DE350B;
    --warning-color: #FF991F;
    
    --background-color: #FAFBFC;
    --surface-color: #FFFFFF;
    --border-color: #DFE1E6;
    --text-primary: #172B4D;
    --text-secondary: #6B778C;
    
    --shadow-sm: 0 1px 2px rgba(9, 30, 66, 0.25);
    --shadow-md: 0 2px 8px rgba(9, 30, 66, 0.15);
    --shadow-lg: 0 8px 16px rgba(9, 30, 66, 0.15);
    
    --radius-sm: 3px;
    --radius-md: 6px;
    --radius-lg: 12px;
    
    --transition: all 0.2s ease;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
    background-color: var(--background-color);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

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

/* ヘッダー */
.header {
    background-color: var(--surface-color);
    border-bottom: 1px solid var(--border-color);
    padding: 20px 0;
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.app-title {
    font-size: 24px;
    font-weight: 600;
    color: var(--text-primary);
}

.language-selector select {
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background-color: var(--surface-color);
    color: var(--text-primary);
    font-size: 14px;
    cursor: pointer;
    transition: var(--transition);
}

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

/* メインコンテンツ */
.main-content {
    padding: 40px 0;
}

/* セクション共通スタイル */
section {
    background-color: var(--surface-color);
    border-radius: var(--radius-md);
    padding: 24px;
    margin-bottom: 24px;
    box-shadow: var(--shadow-sm);
}

section h2 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--text-primary);
}

/* フォーム */
.expense-form {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group label {
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 6px;
    color: var(--text-secondary);
}

.form-group input,
.form-group select {
    padding: 10px 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 14px;
    transition: var(--transition);
}

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

/* ボタン */
.btn {
    padding: 10px 20px;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

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

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

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

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

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

.btn-danger:hover {
    background-color: #B7280E;
}

/* 統計カード */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
}

.stat-card {
    background-color: var(--background-color);
    padding: 20px;
    border-radius: var(--radius-md);
    text-align: center;
    transition: var(--transition);
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.stat-card h3 {
    font-size: 14px;
    color: var(--text-secondary);
    font-weight: 500;
    margin-bottom: 8px;
}

.stat-value {
    font-size: 28px;
    font-weight: 600;
    color: var(--primary-color);
}

/* チャート */
.chart-container {
    position: relative;
    height: 300px;
    margin-bottom: 24px;
}

/* カテゴリ別内訳 */
.category-breakdown {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.category-item {
    display: grid;
    grid-template-columns: 1fr auto;
    align-items: center;
    gap: 12px;
}

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

.category-name {
    font-weight: 500;
    color: var(--text-primary);
}

.category-amount {
    font-weight: 600;
    color: var(--primary-color);
}

.category-bar {
    grid-column: 1 / -1;
    height: 8px;
    background-color: var(--background-color);
    border-radius: 4px;
    overflow: hidden;
}

.category-bar-fill {
    height: 100%;
    background-color: var(--primary-color);
    transition: width 0.3s ease;
}

.category-percent {
    font-size: 12px;
    color: var(--text-secondary);
}

/* 月次レポート */
.report-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.month-selector {
    display: flex;
    align-items: center;
    gap: 12px;
}

#currentMonth {
    font-weight: 600;
    min-width: 150px;
    text-align: center;
}

.report-summary {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.report-item {
    text-align: center;
    padding: 16px;
    background-color: var(--background-color);
    border-radius: var(--radius-md);
}

.report-label {
    display: block;
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.report-value {
    font-size: 24px;
    font-weight: 600;
    color: var(--primary-color);
}

.weekly-summary h4 {
    font-size: 16px;
    margin-bottom: 12px;
}

.week-item {
    display: flex;
    justify-content: space-between;
    padding: 8px 0;
    border-bottom: 1px solid var(--border-color);
}

.week-item:last-child {
    border-bottom: none;
}

.report-actions {
    display: flex;
    gap: 12px;
    margin-top: 20px;
}

/* 経費リスト */
.expense-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.expense-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px;
    background-color: var(--background-color);
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.expense-item:hover {
    transform: translateX(4px);
    box-shadow: var(--shadow-sm);
}

.expense-info {
    display: flex;
    align-items: center;
    gap: 16px;
    flex: 1;
}

.expense-date {
    font-size: 14px;
    color: var(--text-secondary);
    min-width: 80px;
}

.expense-category {
    font-size: 14px;
    padding: 4px 12px;
    background-color: var(--primary-color);
    color: white;
    border-radius: 12px;
    font-weight: 500;
}

.expense-description {
    font-size: 14px;
    color: var(--text-primary);
}

.expense-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.expense-amount {
    font-size: 18px;
    font-weight: 600;
    color: var(--primary-color);
}

.btn-delete {
    width: 32px;
    height: 32px;
    border: none;
    background-color: transparent;
    color: var(--text-secondary);
    font-size: 20px;
    cursor: pointer;
    border-radius: 50%;
    transition: var(--transition);
}

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

/* 通知 */
.notification {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 16px 24px;
    background-color: var(--success-color);
    color: white;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    transform: translateX(400px);
    transition: transform 0.3s ease;
    z-index: 1000;
}

.notification.show {
    transform: translateX(0);
}

/* データなし */
.no-data {
    text-align: center;
    color: var(--text-secondary);
    padding: 40px 0;
    font-size: 14px;
}

/* フッター */
.footer {
    background-color: var(--surface-color);
    border-top: 1px solid var(--border-color);
    padding: 20px 0;
    text-align: center;
    margin-top: 40px;
}

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

/* レスポンシブ */
@media (max-width: 768px) {
    .header .container {
        flex-direction: column;
        gap: 16px;
    }
    
    .expense-form {
        grid-template-columns: 1fr;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .expense-info {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }
    
    .expense-item {
        flex-direction: column;
        align-items: stretch;
        gap: 12px;
    }
    
    .expense-actions {
        justify-content: space-between;
    }
    
    .report-header {
        flex-direction: column;
        gap: 16px;
    }
}

@media (max-width: 480px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    section {
        padding: 16px;
    }
    
    .app-title {
        font-size: 20px;
    }
}