/* ==========================================
   リセット＆ベーススタイル
   ========================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary-color: #64748b;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-light: #94a3b8;
    
    --border-color: #e2e8f0;
    --border-radius: 8px;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', 'Hiragino Sans', 'Hiragino Kaku Gothic ProN', Meiryo, sans-serif;
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

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

.header .container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.day-display {
    background-color: var(--bg-secondary);
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    font-weight: 600;
    color: var(--text-primary);
}

.nav {
    display: flex;
    gap: 1rem;
}

.nav-link {
    padding: 0.5rem 1rem;
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: var(--border-radius);
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-link:hover {
    background-color: var(--bg-secondary);
    color: var(--primary-color);
}

/* ==========================================
   メインコンテナ
   ========================================== */
.main-container {
    padding: 2rem;
}

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

.main-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    align-items: start;
}

/* ==========================================
   パネル
   ========================================== */
.panel {
    background-color: var(--bg-primary);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    overflow: hidden;
}

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

.panel-header h2 {
    font-size: 1.25rem;
    font-weight: 600;
}

.panel-left {
    position: sticky;
    top: 100px;
    max-height: calc(100vh - 120px);
    overflow-y: auto;
}

.panel-right {
    display: flex;
    flex-direction: column;
}

/* ==========================================
   イベントカード
   ========================================== */
.event-cards {
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.event-card {
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 1rem;
    transition: all 0.2s;
    background-color: var(--bg-primary);
}

.event-card.active {
    border-color: var(--primary-color);
    background-color: #eff6ff;
}

.event-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 0.75rem;
}

.event-card-title {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex: 1;
}

.event-card-title h3 {
    font-size: 1rem;
    font-weight: 600;
}

.priority-badge {
    background-color: var(--bg-tertiary);
    color: var(--text-secondary);
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 500;
}

.event-toggle {
    position: relative;
    width: 48px;
    height: 24px;
}

.event-toggle input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #ccc;
    transition: 0.3s;
    border-radius: 24px;
}

.toggle-slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: 0.3s;
    border-radius: 50%;
}

.event-toggle input:checked + .toggle-slider {
    background-color: var(--primary-color);
}

.event-toggle input:checked + .toggle-slider:before {
    transform: translateX(24px);
}

.event-options {
    display: none;
    padding-top: 0.75rem;
    border-top: 1px solid var(--border-color);
    gap: 0.75rem;
    flex-direction: column;
}

.event-card.active .event-options {
    display: flex;
}

.option-group {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.option-group label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.option-group select {
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background-color: var(--bg-primary);
    font-size: 0.875rem;
}

/* ==========================================
   プレビュー＆出力
   ========================================== */
.char-counter {
    font-size: 1rem;
    font-weight: 600;
}

.char-count {
    color: var(--primary-color);
    font-size: 1.25rem;
}

.char-counter.warning .char-count {
    color: var(--warning-color);
}

.char-counter.danger .char-count {
    color: var(--danger-color);
}

.preview-box {
    padding: 1.5rem;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    min-height: 200px;
    white-space: pre-wrap;
    font-family: 'Hiragino Sans', 'Hiragino Kaku Gothic ProN', Meiryo, sans-serif;
    line-height: 1.8;
    font-size: 0.95rem;
}

.preview-placeholder {
    color: var(--text-light);
    text-align: center;
    padding: 3rem 1rem;
}

.editor-section {
    padding: 1.5rem;
}

.editor-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.editor-textarea {
    width: 100%;
    min-height: 200px;
    padding: 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    font-family: inherit;
    font-size: 0.95rem;
    line-height: 1.8;
    resize: vertical;
}

.editor-textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.action-buttons {
    padding: 0 1.5rem 1.5rem;
    display: flex;
    gap: 1rem;
}

/* ==========================================
   ボタン
   ========================================== */
.btn {
    padding: 0.5rem 1rem;
    border: none;
    border-radius: var(--border-radius);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
    background-color: var(--primary-hover);
}

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

.btn-secondary:hover:not(:disabled) {
    background-color: #475569;
}

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

.btn-success:hover:not(:disabled) {
    background-color: #059669;
}

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

.btn-danger:hover:not(:disabled) {
    background-color: #dc2626;
}

.btn-large {
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    flex: 1;
}

/* ==========================================
   アラート
   ========================================== */
.alert {
    padding: 1rem 1.5rem;
    margin: 0 1.5rem 1.5rem;
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.alert-warning {
    background-color: #fef3c7;
    color: #92400e;
    border: 1px solid #fcd34d;
}

.alert.hidden {
    display: none;
}

/* ==========================================
   タブ
   ========================================== */
.tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 2rem;
    border-bottom: 2px solid var(--border-color);
}

.tab-btn {
    padding: 0.75rem 1.5rem;
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: -2px;
}

.tab-btn:hover {
    color: var(--primary-color);
}

.tab-btn.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* ==========================================
   フォーム
   ========================================== */
.form-section {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.form-section:last-child {
    border-bottom: none;
}

.form-section h3 {
    font-size: 1.125rem;
    margin-bottom: 0.5rem;
}

.form-section h4 {
    font-size: 1rem;
    margin-bottom: 1rem;
}

.section-description {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-bottom: 1rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.required {
    color: var(--danger-color);
}

.form-input,
.form-textarea {
    width: 100%;
    padding: 0.625rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    font-family: inherit;
    font-size: 0.875rem;
}

.form-input:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-textarea {
    min-height: 100px;
    resize: vertical;
}

.form-help {
    display: block;
    margin-top: 0.25rem;
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr auto;
    gap: 1rem;
    align-items: end;
}

.checkbox-group {
    margin-bottom: 1rem;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    font-weight: 500;
}

.checkbox-label input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
}

/* ==========================================
   テーブル
   ========================================== */
.table-container {
    overflow-x: auto;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
}

.data-table th {
    background-color: var(--bg-secondary);
    padding: 0.75rem 1rem;
    text-align: left;
    font-weight: 600;
    font-size: 0.875rem;
    border-bottom: 2px solid var(--border-color);
}

.data-table td {
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.875rem;
}

.data-table tbody tr:hover {
    background-color: var(--bg-secondary);
}

.empty-row td {
    text-align: center;
    color: var(--text-secondary);
    padding: 2rem;
}

.status-badge {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 500;
}

.status-active {
    background-color: #d1fae5;
    color: #065f46;
}

.status-inactive {
    background-color: #fee2e2;
    color: #991b1b;
}

.option-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.25rem;
}

.option-tag {
    background-color: var(--bg-tertiary);
    color: var(--text-secondary);
    padding: 0.125rem 0.5rem;
    border-radius: 4px;
    font-size: 0.75rem;
}

/* ==========================================
   モーダル
   ========================================== */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    overflow-y: auto;
}

.modal.active {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
}

.modal-content {
    background-color: var(--bg-primary);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 600px;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-large {
    max-width: 800px;
}

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

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

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
}

.modal-close:hover {
    background-color: 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;
}

/* ==========================================
   履歴リスト
   ========================================== */
.history-list {
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.history-item {
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    transition: all 0.2s;
}

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

.history-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border-color);
}

.history-date {
    font-weight: 600;
    font-size: 1.125rem;
    color: var(--primary-color);
}

.history-meta {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.history-content {
    background-color: var(--bg-secondary);
    padding: 1rem;
    border-radius: var(--border-radius);
    white-space: pre-wrap;
    font-family: 'Hiragino Sans', 'Hiragino Kaku Gothic ProN', Meiryo, sans-serif;
    line-height: 1.8;
    font-size: 0.95rem;
    margin-bottom: 1rem;
}

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

/* ==========================================
   ローディング
   ========================================== */
.loading {
    text-align: center;
    padding: 2rem;
    color: var(--text-secondary);
}

/* ==========================================
   レスポンシブ
   ========================================== */
@media (max-width: 1024px) {
    .main-grid {
        grid-template-columns: 1fr;
    }
    
    .panel-left {
        position: static;
        max-height: none;
    }
    
    .header .container {
        flex-wrap: wrap;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 640px) {
    .main-container {
        padding: 1rem;
    }
    
    .header .container {
        padding: 1rem;
    }
    
    .nav {
        width: 100%;
        justify-content: space-around;
    }
    
    .action-buttons {
        flex-direction: column;
    }
    
    .tabs {
        overflow-x: auto;
    }
}