/* ===== リセット & 基本設定 ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* カラーパレット */
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary-color: #06b6d4;
    --accent-color: #f59e0b;
    --danger-color: #ef4444;
    --success-color: #10b981;

    /* 背景色 */
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --bg-hover: #e2e8f0;

    /* テキスト色 */
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-light: #94a3b8;

    /* ボーダー */
    --border-color: #e2e8f0;
    --border-radius: 12px;
    --border-radius-sm: 8px;

    /* シャドウ */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.15);

    /* レイアウト */
    --header-height: 64px;
    --footer-height: 56px;
    --sidebar-width: 240px;

    /* トランジション */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

/* ===== ヘッダー ===== */
.app-header {
    height: var(--header-height);
    background: var(--bg-primary);
    box-shadow: var(--shadow-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 2rem;
    position: sticky;
    top: 0;
    z-index: 100;
}

.app-title {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.save-indicator {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--bg-secondary);
    border-radius: var(--border-radius-sm);
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.save-indicator.saving {
    background: #fef3c7;
    color: #92400e;
}

.save-indicator.saved {
    background: #d1fae5;
    color: #065f46;
}

.icon-btn {
    width: 40px;
    height: 40px;
    border: none;
    background: var(--bg-secondary);
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.25rem;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.icon-btn:hover {
    background: var(--bg-hover);
    transform: scale(1.05);
}

/* ===== メインコンテナ ===== */
.main-container {
    display: flex;
    flex: 1;
    overflow: hidden;
}

/* ===== サイドバー ===== */
.sidebar {
    width: var(--sidebar-width);
    background: var(--bg-primary);
    box-shadow: var(--shadow-md);
    overflow-y: auto;
}

.nav-menu {
    padding: 1rem 0;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.875rem 1.5rem;
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
    border-left: 3px solid transparent;
}

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

.nav-item.active {
    background: linear-gradient(90deg, rgba(37, 99, 235, 0.1), transparent);
    color: var(--primary-color);
    border-left-color: var(--primary-color);
    font-weight: 600;
}

.nav-icon {
    font-size: 1.25rem;
}

.nav-label {
    font-size: 0.9375rem;
}

/* ===== メインコンテンツ ===== */
.main-content {
    flex: 1;
    background: var(--bg-secondary);
    overflow-y: auto;
    padding: 2rem;
}

.page {
    display: none;
    animation: fadeIn 0.3s ease-in-out;
}

.page.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.page-header {
    margin-bottom: 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.page-header h2 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
}

.page-description {
    color: var(--text-secondary);
    margin-top: 0.5rem;
}

.page-actions {
    display: flex;
    gap: 0.75rem;
}

/* ===== ダッシュボード ===== */
.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
}

.dashboard-card {
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: var(--shadow-md);
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.dashboard-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    transform: scaleX(0);
    transition: var(--transition);
}

.dashboard-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.dashboard-card:hover::before {
    transform: scaleX(1);
}

.card-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.dashboard-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.dashboard-card p {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-bottom: 1rem;
}

.card-badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: var(--bg-secondary);
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-secondary);
}

/* ===== ボタン ===== */
.btn {
    padding: 0.625rem 1.25rem;
    border: none;
    border-radius: var(--border-radius-sm);
    font-size: 0.9375rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

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

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

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

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

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

.btn-danger:hover {
    background: #dc2626;
}

/* ===== 検索バー ===== */
.search-bar {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.search-input {
    flex: 1;
    padding: 0.75rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    font-size: 0.9375rem;
    transition: var(--transition);
    background: var(--bg-primary);
}

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

.sort-select {
    padding: 0.75rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    font-size: 0.9375rem;
    background: var(--bg-primary);
    cursor: pointer;
}

/* ===== 生徒リスト ===== */
.student-list {
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    overflow: hidden;
}

.student-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition);
}

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

.student-item:hover {
    background: var(--bg-secondary);
}

.student-info {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.student-number {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-light);
    min-width: 50px;
}

.student-name {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.name-kanji {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
}

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

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

.btn-icon {
    width: 36px;
    height: 36px;
    border: none;
    background: var(--bg-secondary);
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
}

.btn-icon:hover {
    background: var(--bg-hover);
    transform: scale(1.05);
}

.btn-icon.delete:hover {
    background: #fee2e2;
    color: var(--danger-color);
}

/* ===== メモページ ===== */
.memo-container {
    display: flex;
    gap: 1.5rem;
    height: calc(100vh - var(--header-height) - var(--footer-height) - 6rem);
}

.memo-sidebar {
    width: 280px;
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.memo-search {
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.memo-student-list {
    flex: 1;
    overflow-y: auto;
    padding: 0.5rem;
}

.memo-student-item {
    padding: 0.875rem 1rem;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: var(--transition);
    margin-bottom: 0.25rem;
}

.memo-student-item:hover {
    background: var(--bg-secondary);
}

.memo-student-item.active {
    background: linear-gradient(90deg, rgba(37, 99, 235, 0.1), transparent);
    color: var(--primary-color);
    font-weight: 600;
}

.seating-main {
    flex: 1;
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    padding: 2rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    overflow-y: auto;
}

.memo-editor-container {
    height: 100%;
    display: flex;
    flex-direction: column;
}

.memo-editor-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.memo-editor-header h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.memo-tags {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.tag {
    padding: 0.25rem 0.75rem;
    background: var(--bg-secondary);
    border-radius: 999px;
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.memo-editor {
    flex: 1;
    padding: 1.5rem;
    overflow-y: auto;
}

.memo-textarea {
    width: 100%;
    height: 100%;
    border: none;
    resize: none;
    font-family: inherit;
    font-size: 0.9375rem;
    line-height: 1.6;
    outline: none;
}

/* ===== 空状態 ===== */
.empty-state {
    text-align: center;
    padding: 4rem 2rem;
    color: var(--text-secondary);
}

.empty-state-small {
    text-align: center;
    padding: 2rem 1rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.empty-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}

/* ===== フッター ===== */
.app-footer {
    height: var(--footer-height);
    background: var(--bg-primary);
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.05);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 2rem;
}

.footer-left {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
}

.footer-label {
    color: var(--text-secondary);
}

.save-mode {
    font-weight: 600;
    color: var(--primary-color);
}

.footer-right {
    display: flex;
    gap: 0.75rem;
}

.btn-footer {
    padding: 0.5rem 1rem;
    border: none;
    background: var(--bg-secondary);
    border-radius: var(--border-radius-sm);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.btn-footer:hover {
    background: var(--bg-hover);
    transform: translateY(-1px);
}

/* ===== モーダル ===== */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal.active {
    display: flex;
    animation: fadeIn 0.2s ease-in-out;
}

.modal-content {
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-xl);
    width: 90%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    animation: slideUp 0.3s ease-out;
}

.modal-large {
    max-width: 700px;
}

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

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

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

.modal-close {
    width: 32px;
    height: 32px;
    border: none;
    background: var(--bg-secondary);
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.25rem;
    transition: var(--transition);
}

.modal-close:hover {
    background: var(--bg-hover);
    transform: rotate(90deg);
}

.modal-body {
    padding: 1.5rem;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 0.75rem;
    padding: 1.5rem;
    border-top: 1px solid var(--border-color);
}

/* ===== フォーム ===== */
.form-group {
    margin-bottom: 1.25rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    font-size: 0.9375rem;
    transition: var(--transition);
}

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

/* ===== 設定画面 ===== */
.settings-section {
    margin-bottom: 2rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--border-color);
}

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

.settings-section h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.help-text {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-top: 0.5rem;
}

.state-save-list,
.auto-save-list,
.state-load-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.save-slot-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: var(--border-radius-sm);
}

.save-slot-info {
    flex: 1;
}

.save-slot-name {
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.save-slot-time {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

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

/* ===== 席替えツール ===== */
.seating-container {
    display: flex;
    gap: 1.5rem;
    height: calc(100vh - var(--header-height) - var(--footer-height) - 8rem);
}

.seating-sidebar {
    width: 280px;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.seating-controls {
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--shadow-md);
}

.seating-controls h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.unassigned-container {
    flex: 1;
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--shadow-md);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.unassigned-container h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.unassigned-students {
    flex: 1;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.unassigned-student {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.875rem;
    background: var(--bg-secondary);
    border-radius: var(--border-radius-sm);
    cursor: move;
    transition: var(--transition);
}

.unassigned-student:hover {
    background: var(--bg-hover);
    transform: translateX(4px);
}

.seating-main {
    flex: 1;
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: var(--shadow-md);
    overflow: auto;
    display: flex;
    align-items: center;
    justify-content: center;
}

.seating-grid {
    display: grid;
    gap: 0.75rem;
    width: fit-content;
}

.seat {
    background: var(--bg-primary);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    padding: 1rem;
    min-height: 100px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: relative;
    transition: var(--transition);
}

.seat.locked {
    border-color: var(--accent-color);
    background: rgba(245, 158, 11, 0.05);
}

.seat-lock-btn {
    position: absolute;
    top: 5px;
    right: 5px;
    border: none;
    background: none;
    cursor: pointer;
    font-size: 0.75rem;
    padding: 2px;
    opacity: 0.3;
    transition: var(--transition);
    z-index: 10;
}

.seat:hover .seat-lock-btn,
.seat-lock-btn.active {
    opacity: 1;
}

.teacher-desk {
    grid-column: 1 / -1;
    margin: 2rem auto 0;
    width: 200px;
    height: 60px;
    background: var(--bg-tertiary);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    color: var(--text-secondary);
    box-shadow: var(--shadow-sm);
}

.seat.drag-over {
    border-color: var(--primary-color);
    background: rgba(37, 99, 235, 0.1);
    transform: scale(1.05);
}

.seat.occupied {
    background: var(--bg-primary);
    border-color: var(--primary-color);
}

.seat-empty {
    color: var(--text-light);
    font-size: 0.75rem;
}

.seat-student {
    text-align: center;
    cursor: move;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 0.5rem;
}

.seat-student:hover {
    background: rgba(37, 99, 235, 0.05);
}

.seat-number {
    font-size: 0.75rem;
    color: var(--text-light);
    margin-bottom: 0.25rem;
}

.seat-name {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    word-break: break-all;
}

/* 履歴アイテム */
.history-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: var(--border-radius-sm);
    margin-bottom: 0.75rem;
}

.history-info {
    flex: 1;
}

.history-name {
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.history-time {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

.history-size {
    font-size: 0.75rem;
    color: var(--text-light);
}

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

/* ===== クラス係掲示ツール ===== */
.duties-container {
    display: flex;
    gap: 1.5rem;
    height: calc(100vh - var(--header-height) - var(--footer-height) - 8rem);
}

.duties-sidebar {
    width: 350px;
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--shadow-md);
    overflow-y: auto;
}

.duties-sidebar h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.duty-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.duty-card {
    background: var(--bg-secondary);
    border-radius: var(--border-radius-sm);
    padding: 1rem;
    border-left: 4px solid var(--primary-color);
}

.duty-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 0.75rem;
}

.duty-info {
    flex: 1;
}

.duty-name {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

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

.duty-stats {
    display: flex;
    gap: 1rem;
    margin-bottom: 0.75rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.duty-stat {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.duty-students {
    margin-top: 0.75rem;
}

.assigned-students {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
}

.assigned-student-tag {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.25rem 0.75rem;
    background: var(--bg-primary);
    border-radius: 999px;
    font-size: 0.875rem;
}

.remove-student-btn {
    border: none;
    background: none;
    cursor: pointer;
    color: var(--text-light);
    font-size: 0.75rem;
    padding: 0;
    transition: var(--transition);
}

.remove-student-btn:hover {
    color: var(--danger-color);
}

.btn-sm {
    padding: 0.375rem 0.75rem;
    font-size: 0.875rem;
}

.duties-main {
    flex: 1;
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--shadow-md);
    overflow-y: auto;
}

.duties-main h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
}

.duty-schedule {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.week-schedule {
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 1.5rem;
}

.week-schedule h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.schedule-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 1rem;
}

.day-schedule {
    background: var(--bg-secondary);
    border-radius: var(--border-radius-sm);
    padding: 1rem;
}

.day-header {
    font-weight: 600;
    margin-bottom: 0.75rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--border-color);
    text-align: center;
}

.day-duties {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.duty-assignment {
    font-size: 0.875rem;
}

.duty-label {
    font-weight: 600;
    color: var(--text-secondary);
}

.duty-students-text {
    color: var(--text-primary);
}

/* ===== 保護者会時間決定ツール ===== */
.meeting-container {
    display: flex;
    gap: 1.5rem;
    height: calc(100vh - var(--header-height) - var(--footer-height) - 8rem);
}

.meeting-sidebar {
    width: 280px;
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--shadow-md);
    overflow-y: auto;
}

.meeting-sidebar h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.meeting-student-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.meeting-student-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem;
    background: var(--bg-secondary);
    border-radius: var(--border-radius-sm);
    cursor: move;
    transition: var(--transition);
}

.meeting-student-item:hover {
    background: var(--bg-hover);
    transform: translateX(4px);
}

.meeting-main {
    flex: 1;
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--shadow-md);
    overflow-y: auto;
}

.meeting-main h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
}

.time-slots {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1rem;
}

.time-slot {
    background: var(--bg-secondary);
    border-radius: var(--border-radius-sm);
    padding: 1rem;
    border: 2px solid var(--border-color);
    transition: var(--transition);
    min-height: 80px;
}

.time-slot.assigned {
    border-color: var(--primary-color);
    background: rgba(37, 99, 235, 0.05);
}

.time-slot:hover {
    border-color: var(--primary-color);
}

.slot-time {
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
}

.slot-student {
    min-height: 40px;
}

.assigned-student {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.5rem;
    background: var(--bg-primary);
    border-radius: var(--border-radius-sm);
    cursor: move;
}

.empty-slot {
    color: var(--text-light);
    font-size: 0.875rem;
}

.remove-btn {
    border: none;
    background: none;
    cursor: pointer;
    color: var(--text-light);
    font-size: 0.875rem;
    padding: 0 0.25rem;
    transition: var(--transition);
}

.remove-btn:hover {
    color: var(--danger-color);
}

/* ===== レスポンシブ ===== */
@media (max-width: 768px) {
    .sidebar {
        width: 200px;
    }

    .main-content {
        padding: 1rem;
    }

    .dashboard-grid {
        grid-template-columns: 1fr;
    }

    .memo-container {
        flex-direction: column;
        height: auto;
    }

    .memo-sidebar {
        width: 100%;
        height: 200px;
    }
}
/* �ȑւ��c�[���p���b�N�֘A */
.seat {
    position: relative;
}

.seat-lock-btn {
    position: absolute;
    top: 2px;
    right: 2px;
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1.2rem;
    padding: 0;
    opacity: 0.3;
    transition: opacity 0.2s;
    z-index: 10;
}

.seat:hover .seat-lock-btn,
.seat.locked .seat-lock-btn {
    opacity: 1;
}

.seat.locked {
    background-color: #f0f0f0;
    border-color: #999;
}

.seat-lock-btn.active {
    opacity: 1;
}

/* �N���X�W�f���c�[���i�V�d�l�j */
.duty-cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

.duty-card-large {
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
    border-top: 4px solid var(--primary-color);
}

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

.duty-title {
    display: flex;
    align-items: baseline;
}

.duty-title h4 {
    margin: 0;
    font-size: 1.25rem;
}

.duty-count {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-left: 0.5rem;
}

.duty-count.over {
    color: var(--danger-color);
    font-weight: bold;
}

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

.duty-slots {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: 0.75rem;
    margin-top: 1rem;
}

.duty-slot {
    background: var(--bg-primary);
    border: 2px dashed var(--border-color);
    border-radius: var(--border-radius-sm);
    min-height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.duty-slot.occupied {
    border-style: solid;
    border-color: var(--border-color);
}

.duty-slot.drag-over {
    border-color: var(--primary-color);
    background: rgba(37, 99, 235, 0.05);
}

.duty-slot.empty {
    background-color: rgba(0,0,0,0.02);
}

/* �X���b�g���̐��k */
.slot-student {
    width: 100%;
    height: 100%;
    padding: 0.5rem;
    text-align: center;
    cursor: move;
}

.slot-number {
    font-size: 0.75rem;
    color: var(--text-light);
}

.slot-name {
    font-weight: 600;
}

.slot-placeholder {
    color: var(--text-light);
    font-size: 0.875rem;
}

/* �ی�҉�c�[���i�V�d�l�j */
.meeting-matrix {
    display: flex;
    flex-direction: column;
    overflow-x: auto;
    border: 1px solid var(--border-color);
    max-height: 600px;
    overflow-y: auto;
}

.matrix-header-row,
.matrix-row {
    display: flex;
    min-width: max-content;
}

.matrix-header-row {
    background: var(--bg-tertiary);
    border-bottom: 2px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 5;
}

.matrix-row {
    border-bottom: 1px solid var(--border-color);
}

.matrix-row:last-child {
    border-bottom: none;
}

/* �Z������ */
.matrix-corner,
.matrix-header-time,
.matrix-date-header,
.matrix-slot {
    padding: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border-right: 1px solid var(--border-color);
}

.matrix-corner, .matrix-date-header {
    width: 140px;
    flex-shrink: 0;
    font-weight: 600;
    background: var(--bg-secondary);
    position: sticky;
    left: 0;
    z-index: 4;
    border-right: 2px solid var(--border-color);
}

.matrix-corner {
    z-index: 6;
}

.matrix-header-time, .matrix-slot {
    width: 120px;
    flex-shrink: 0;
}

.matrix-header-time {
    font-weight: 600;
}

.matrix-slot {
    height: 70px;
    transition: var(--transition);
    padding: 4px;
}

.matrix-slot.drag-over {
    background: rgba(37, 99, 235, 0.1);
}

.matrix-slot.occupied {
    background: white;
}

.matrix-slot.empty {
    background: #fafafa;
}

.slot-student-chip {
    background: var(--bg-primary);
    border: 1px solid var(--primary-color);
    border-radius: var(--border-radius-sm);
    padding: 0.25rem 0.5rem;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.875rem;
    cursor: move;
    box-shadow: var(--shadow-sm);
}

.chip-number {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-right: 4px;
}

.chip-name {
    font-weight: 600;
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.remove-assignment {
    background: none;
    border: none;
    color: var(--text-light);
    cursor: pointer;
    font-size: 1rem;
    padding: 0 4px;
}

.remove-assignment:hover {
    color: var(--danger-color);
}

.form-group-row {
    display: flex;
    gap: 1rem;
}
.form-group-row .form-group {
    flex: 1;
}

.checkbox-group {
    flex-direction: row;
    align-items: center;
    gap: 0.5rem;
}
.checkbox-group input {
    width: auto;
}

/* �}�g���N�XUI�p�lj��X�^�C���i�]�u�Ή��j */
.matrix-time-header {
    width: 100px;
    background: #f0f0f0;
    text-align: center;
    border-bottom: 1px solid #ddd;
    border-right: 1px solid #ddd;
    display: flex;
    align-items: center;
    justify-content: center;
    position: sticky;
    left: 0;
    z-index: 2;
}

.matrix-header-date {
    width: 140px;
    background: #e0f2fe;
    text-align: center;
    border-right: 1px solid #ddd;
    display: flex;
    align-items: center;
    justify-content: center;
}


/* �J�[�h���b�N�p�X�^�C�� */
.seat.card-locked {
    background: #fef3c7;
    border-color: #f59e0b;
}
.seat.card-locked .seat-card {
    opacity: 0.9;
}
.card-lock-btn {
    position: absolute;
    bottom: 2px;
    right: 2px;
    width: 20px;
    height: 20px;
    padding: 0;
    font-size: 12px;
    background: transparent;
    border: none;
    cursor: pointer;
    opacity: 0.5;
    z-index: 5;
}
.card-lock-btn:hover {
    opacity: 1;
}
.card-lock-btn.active {
    opacity: 1;
}
.seat.dragging {
    opacity: 0.5;
    border-style: dashed;
}

/* �ی�҉�b�N�X�^�C�� */
.matrix-slot.slot-locked {
    background: #fef3c7;
    border-color: #f59e0b;
}
.slot-student-chip.locked {
    background: #e2e8f0;
    cursor: not-allowed;
}
.slot-lock-btn, .student-lock-btn {
    position: absolute;
    width: 18px;
    height: 18px;
    padding: 0;
    font-size: 10px;
    background: transparent;
    border: none;
    cursor: pointer;
    opacity: 0.5;
    z-index: 5;
}
.slot-lock-btn {
    top: 2px;
    left: 2px;
}
.student-lock-btn {
    top: 2px;
    right: 2px;
}
.slot-lock-btn:hover, .student-lock-btn:hover {
    opacity: 1;
}
.slot-lock-btn.active, .student-lock-btn.active {
    opacity: 1;
}

/* ���b�N��Ԃ̐ԐF�����i����j */
.seat.locked,
.seat.card-locked,
.matrix-slot.slot-locked,
.slot-student-chip.locked {
    background: #fee2e2 !important;
    border-color: #ef4444 !important;
}
.seat-lock-btn.active,
.card-lock-btn.active,
.slot-lock-btn.active,
.student-lock-btn.active {
    color: #dc2626;
    opacity: 1;
}
.seat-empty-card {
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    height: 100%;
}

/* �ی�҉�}�g���N�X���C�A�E�g�C�� */
.meeting-matrix {
    display: table;
    width: 100%;
    border-collapse: collapse;
}
.matrix-header-row {
    display: table-row;
    background: #f5f5f5;
}
.matrix-row {
    display: table-row;
}
.matrix-corner {
    display: table-cell;
    padding: 8px;
    border: 1px solid #ddd;
    font-weight: bold;
    vertical-align: middle;
    text-align: center;
    min-width: 80px;
    background: #e5e5e5;
}
.matrix-header-date {
    display: table-cell;
    padding: 8px;
    border: 1px solid #ddd;
    font-weight: bold;
    vertical-align: middle;
    text-align: center;
    min-width: 100px;
    background: #f5f5f5;
}
.matrix-time-header {
    display: table-cell;
    padding: 8px;
    border: 1px solid #ddd;
    font-weight: bold;
    vertical-align: middle;
    text-align: center;
    min-width: 80px;
    background: #f9f9f9;
}
.matrix-slot {
    display: table-cell;
    padding: 8px;
    border: 1px solid #ddd;
    vertical-align: middle;
    text-align: center;
    min-width: 100px;
    min-height: 40px;
    position: relative;
}
.matrix-slot.empty {
    background: #fff;
}
.matrix-slot.occupied {
    background: #e0f2fe;
}
.matrix-slot.disabled {
    background: #f0f0f0;
}

/* �ی�҉��g���b�N�{�^���X�^�C�� */
.slot-empty-lock-btn {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    padding: 4px 8px;
    font-size: 11px;
    background: #f0f0f0;
    border: 1px solid #ccc;
    border-radius: 3px;
    cursor: pointer;
    z-index: 5;
}
.slot-empty-lock-btn:hover {
    background: #e0e0e0;
}
.slot-empty-lock-btn.active {
    background: #fee2e2;
    border-color: #ef4444;
    color: #dc2626;
    font-weight: bold;
}
/* ��g���b�N���̎ΐ� */
.matrix-slot.empty.slot-locked::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        to bottom right,
        transparent calc(50% - 1px),
        #999 calc(50% - 1px),
        #999 calc(50% + 1px),
        transparent calc(50% + 1px)
    );
    pointer-events: none;
    z-index: 1;
}