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

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Hiragino Kaku Gothic ProN',
                 'Hiragino Sans', Meiryo, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f5f7fa;
    min-height: 100vh;
}

a {
    color: #2563eb;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

/* ===== レイアウト ===== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

.main-content {
    padding: 2rem 0;
}

/* ===== ヘッダー ===== */
.header {
    background-color: #1e3a5f;
    color: #fff;
    padding: 0.75rem 1rem;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.header-inner {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.header-title {
    font-size: 1.1rem;
    font-weight: 600;
}

.header-user {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.9rem;
}

/* ===== ログインボックス ===== */
.login-box {
    max-width: 480px;
    margin: 3rem auto;
    padding: 2rem;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    text-align: center;
}

.login-box h1 {
    font-size: 1.5rem;
    margin-bottom: 0.25rem;
    color: #1e3a5f;
}

.login-box .subtitle {
    color: #666;
    margin-bottom: 1.5rem;
}

.login-box form {
    text-align: left;
}

/* ===== ボタン ===== */
.btn {
    display: inline-block;
    padding: 0.6rem 1.2rem;
    border: none;
    border-radius: 6px;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    text-align: center;
    text-decoration: none;
    transition: background-color 0.2s, opacity 0.2s;
    line-height: 1.4;
}

.btn:hover {
    opacity: 0.85;
    text-decoration: none;
}

.btn-primary {
    background-color: #2563eb;
    color: #fff;
}

.btn-secondary {
    background-color: #6b7280;
    color: #fff;
}

.btn-success {
    background-color: #16a34a;
    color: #fff;
}

.btn-danger {
    background-color: #dc2626;
    color: #fff;
}

.btn-sm {
    padding: 0.3rem 0.7rem;
    font-size: 0.8rem;
}

.btn-lg {
    padding: 0.8rem 2rem;
    font-size: 1.1rem;
}

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

.form-group label {
    display: block;
    margin-bottom: 0.3rem;
    font-weight: 500;
    font-size: 0.9rem;
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group input[type="number"],
.form-group input[type="date"],
.form-group select {
    width: 100%;
    padding: 0.55rem 0.75rem;
    border: 1px solid #d1d5db;
    border-radius: 6px;
    font-size: 0.95rem;
    background-color: #fff;
    transition: border-color 0.2s;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: #2563eb;
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-textarea {
    width: 100%;
    padding: 0.55rem 0.75rem;
    border: 1px solid #d1d5db;
    border-radius: 6px;
    font-size: 0.95rem;
    font-family: inherit;
    resize: vertical;
}

.form-textarea:focus {
    outline: none;
    border-color: #2563eb;
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 0.5rem 1.5rem;
}

.form-section {
    padding: 1.5rem;
    margin-top: 0.5rem;
    background: #f9fafb;
    border-radius: 6px;
    border: 1px solid #e5e7eb;
}

.form-inline {
    display: flex;
    align-items: flex-end;
    gap: 1rem;
    flex-wrap: wrap;
    margin-bottom: 1.5rem;
    padding: 1rem;
    background: #f9fafb;
    border-radius: 6px;
    border: 1px solid #e5e7eb;
}

.form-inline .form-group {
    margin-bottom: 0;
}

.form-actions {
    margin-top: 1.5rem;
    text-align: center;
}

.required {
    color: #dc2626;
}

/* ===== ラジオ・チェックボックス ===== */
.radio-group {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.radio-group-vertical {
    flex-direction: column;
}

.radio-label {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.5rem 1rem;
    background: #fff;
    border: 1px solid #d1d5db;
    border-radius: 6px;
    cursor: pointer;
    transition: border-color 0.2s, background-color 0.2s;
    font-size: 0.9rem;
}

.radio-label:hover {
    border-color: #2563eb;
}

.radio-label input:checked + * {
    color: #2563eb;
}

.radio-label:has(input:checked) {
    border-color: #2563eb;
    background-color: #eff6ff;
}

.checkbox-item {
    margin-bottom: 0.4rem;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.4rem 0.5rem;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9rem;
}

.checkbox-label:hover {
    background-color: #f3f4f6;
}

/* ===== アラート ===== */
.alert {
    padding: 1rem 1.25rem;
    border-radius: 6px;
    margin-bottom: 1.5rem;
    font-size: 0.95rem;
}

.alert-error {
    background-color: #fef2f2;
    border: 1px solid #fecaca;
    color: #991b1b;
}

.alert-success {
    background-color: #f0fdf4;
    border: 1px solid #bbf7d0;
    color: #166534;
}

.alert .note {
    font-size: 0.85rem;
    color: #666;
    margin-top: 0.5rem;
}

/* ===== テーブル ===== */
.table-responsive {
    overflow-x: auto;
    margin-top: 1rem;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    background: #fff;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    font-size: 0.88rem;
}

.data-table thead {
    background-color: #1e3a5f;
    color: #fff;
}

.data-table th {
    padding: 0.65rem 0.75rem;
    text-align: left;
    font-weight: 500;
    white-space: nowrap;
}

.data-table td {
    padding: 0.55rem 0.75rem;
    border-bottom: 1px solid #e5e7eb;
    vertical-align: top;
}

.data-table tbody tr:hover {
    background-color: #f9fafb;
}

.row-inactive {
    opacity: 0.5;
}

.actions-cell {
    white-space: nowrap;
    display: flex;
    gap: 0.3rem;
    align-items: center;
}

/* ===== バッジ ===== */
.badge {
    display: inline-block;
    padding: 0.15rem 0.5rem;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 500;
}

.badge-active {
    background-color: #dcfce7;
    color: #166534;
}

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

.badge-required {
    background-color: #dbeafe;
    color: #1e40af;
}

.badge-recommended {
    background-color: #fef3c7;
    color: #92400e;
}

.badge-note {
    background-color: #f3f4f6;
    color: #4b5563;
}

/* ===== ステップセクション ===== */
.step-section {
    margin-bottom: 1.5rem;
    padding: 1.25rem;
    background: #fff;
    border: 1px solid #e5e7eb;
    border-radius: 8px;
}

.step-section legend {
    font-size: 1rem;
    font-weight: 600;
    color: #1e3a5f;
    padding: 0 0.5rem;
}

/* ===== 五十音行ボタン・学生選択 ===== */
.kana-row-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    margin-bottom: 1rem;
}

.btn-kana {
    padding: 0.4rem 0.8rem;
    background: #e5e7eb;
    border: 1px solid #d1d5db;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: background-color 0.2s;
}

.btn-kana:hover {
    background: #d1d5db;
}

.btn-kana.active {
    background: #2563eb;
    color: #fff;
    border-color: #2563eb;
}

.student-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    margin-bottom: 1rem;
    min-height: 2rem;
}

.btn-student {
    padding: 0.4rem 0.8rem;
    background: #fff;
    border: 1px solid #d1d5db;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: background-color 0.2s, border-color 0.2s;
}

.btn-student:hover {
    border-color: #2563eb;
}

.btn-student.selected {
    background-color: #dbeafe;
    border-color: #2563eb;
}

.selected-students {
    padding: 0.75rem;
    background: #f9fafb;
    border-radius: 6px;
    border: 1px solid #e5e7eb;
}

.student-tag {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    padding: 0.25rem 0.6rem;
    background: #2563eb;
    color: #fff;
    border-radius: 20px;
    font-size: 0.85rem;
    margin: 0.2rem;
}

.student-tag .remove-student {
    background: none;
    border: none;
    color: #fff;
    font-size: 1.1rem;
    cursor: pointer;
    padding: 0;
    line-height: 1;
    opacity: 0.8;
}

.student-tag .remove-student:hover {
    opacity: 1;
}

/* ===== プレースホルダ ===== */
.placeholder-text {
    color: #9ca3af;
    font-style: italic;
    padding: 0.5rem 0;
}

/* ===== ダッシュボード ===== */
.dashboard-stats {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: #fff;
    padding: 1.25rem;
    border-radius: 8px;
    text-align: center;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.stat-number {
    font-size: 2rem;
    font-weight: 700;
    color: #1e3a5f;
}

.stat-label {
    font-size: 0.85rem;
    color: #6b7280;
    margin-top: 0.25rem;
}

.admin-nav {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1rem;
}

.admin-nav-item {
    display: block;
    padding: 1.25rem;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    transition: box-shadow 0.2s, transform 0.2s;
    color: #333;
}

.admin-nav-item:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    transform: translateY(-2px);
    text-decoration: none;
}

.admin-nav-item strong {
    display: block;
    font-size: 1.05rem;
    color: #1e3a5f;
    margin-bottom: 0.3rem;
}

.admin-nav-item span {
    font-size: 0.85rem;
    color: #6b7280;
}

/* ===== モーダル ===== */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.modal-content {
    background: #fff;
    padding: 2rem;
    border-radius: 8px;
    max-width: 600px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.modal-content h3 {
    margin-bottom: 1.25rem;
    color: #1e3a5f;
}

.modal-actions {
    margin-top: 1.5rem;
    display: flex;
    gap: 0.75rem;
    justify-content: flex-end;
}

/* ===== ツールバー ===== */
.toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin: 1rem 0;
    flex-wrap: wrap;
    gap: 0.5rem;
}

/* ===== フィルタフォーム ===== */
.filter-form {
    display: flex;
    align-items: flex-end;
    gap: 1rem;
    flex-wrap: wrap;
    margin-bottom: 1rem;
    padding: 1rem;
    background: #fff;
    border-radius: 8px;
    border: 1px solid #e5e7eb;
}

.filter-form-multi .form-group {
    margin-bottom: 0;
    min-width: 150px;
}

.filter-form label {
    font-size: 0.85rem;
    font-weight: 500;
}

.filter-form select,
.filter-form input {
    padding: 0.4rem 0.6rem;
    border: 1px solid #d1d5db;
    border-radius: 6px;
    font-size: 0.9rem;
}

/* ===== 折りたたみ ===== */
.collapsible-section {
    margin-bottom: 1.5rem;
}

.collapsible-section summary {
    cursor: pointer;
    list-style: none;
}

.collapsible-section summary::-webkit-details-marker {
    display: none;
}

/* ===== 完了ボックス ===== */
.complete-box {
    max-width: 500px;
    margin: 2rem auto;
    padding: 2rem;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    text-align: center;
}

.complete-box h2 {
    color: #16a34a;
    margin-bottom: 1rem;
}

.complete-box p {
    margin-bottom: 1.5rem;
    color: #4b5563;
}

/* ===== h2 ===== */
h2 {
    font-size: 1.3rem;
    color: #1e3a5f;
    margin-bottom: 1.25rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid #e5e7eb;
}

/* ===== レスポンシブ ===== */
@media (max-width: 768px) {
    .header-inner {
        flex-direction: column;
        align-items: flex-start;
    }

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

    .dashboard-stats {
        grid-template-columns: repeat(2, 1fr);
    }

    .admin-nav {
        grid-template-columns: 1fr;
    }

    .filter-form {
        flex-direction: column;
        align-items: stretch;
    }

    .radio-group {
        flex-direction: column;
    }

    .data-table {
        font-size: 0.8rem;
    }

    .data-table th,
    .data-table td {
        padding: 0.4rem 0.5rem;
    }
}