/* リセット */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Yu Gothic", sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f5f5f5;
}

/* ヘッダー */
.site-header {
    background-color: #8b4513;
    color: #fff;
    position: sticky;
    top: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    padding: 0 1.5rem;
    gap: 1rem;
}

.header-top {
    display: flex;
    align-items: center;
    flex-shrink: 0;
}

.site-title {
    color: #fff;
    text-decoration: none;
    font-size: 1.1rem;
    font-weight: bold;
    letter-spacing: 0.05em;
    white-space: nowrap;
}

.site-title:hover {
    color: #f5d5b8;
}

.header-nav {
    display: flex;
    align-items: center;
    flex: 1;
    justify-content: flex-end;
}

/* ハンバーガーボタン（PC では非表示）*/
.hamburger-btn {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    width: 36px;
    height: 36px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
    flex-shrink: 0;
}

.hamburger-btn span {
    display: block;
    width: 22px;
    height: 2px;
    background-color: #fff;
    border-radius: 2px;
    transition: transform 0.25s, opacity 0.25s;
}

.hamburger-btn.open span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.hamburger-btn.open span:nth-child(2) {
    opacity: 0;
}

.hamburger-btn.open span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

.tab-nav {
    display: flex;
    gap: 0;
}

.tab {
    display: inline-block;
    padding: 0.8rem 1.2rem;
    color: #f5d5b8;
    text-decoration: none;
    font-weight: bold;
    transition: background-color 0.2s;
}

.tab:hover {
    background-color: #a0521a;
    color: #fff;
}

.tab.active {
    background-color: #fff;
    color: #8b4513;
}

.auth-nav {
    display: flex;
    align-items: center;
    gap: 0.8rem;
}

.auth-nav .btn-link {
    color: #f5d5b8;
    text-decoration: none;
    background: none;
    border: none;
    cursor: pointer;
    font-size: 0.9rem;
}

.auth-nav .btn-link:hover {
    color: #fff;
    text-decoration: underline;
}

.user-name {
    font-size: 0.9rem;
}

/* メインコンテンツ */
.main-content {
    min-height: calc(100vh - 120px);
    padding: 1.5rem;
}

.container {
    max-width: 800px;
    margin: 0 auto;
}

/* フッター */
.site-footer {
    background-color: #8b4513;
    color: #f5d5b8;
    text-align: center;
    padding: 1rem;
    font-size: 0.85rem;
}

/* ボタン */
.btn {
    display: inline-block;
    padding: 0.6rem 1.5rem;
    border: none;
    border-radius: 4px;
    text-decoration: none;
    font-size: 1rem;
    cursor: pointer;
    transition: opacity 0.2s;
}

.btn:hover {
    opacity: 0.85;
}

.btn-primary {
    background-color: #8b4513;
    color: #fff;
}

.btn-secondary {
    background-color: #6c757d;
    color: #fff;
}

.btn-danger {
    background-color: #dc3545;
    color: #fff;
}

/* テーブル */
.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);
}

.data-table th,
.data-table td {
    padding: 0.75rem 1rem;
    text-align: left;
    border-bottom: 1px solid #eee;
}

.data-table th {
    background-color: #8b4513;
    color: #fff;
    font-weight: bold;
}

.data-table tr:hover {
    background-color: #fdf0e6;
}

.data-table tr.selected {
    background-color: #f5d5b8;
}

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

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

.form-group input {
    width: 100%;
    padding: 0.5rem;
    border: 1px solid #ccc;
    border-radius: 4px;
    font-size: 1rem;
}

.form-group input:focus {
    border-color: #8b4513;
    outline: none;
    box-shadow: 0 0 0 2px rgba(139, 69, 19, 0.2);
}

.error-message {
    color: #dc3545;
    font-size: 0.9rem;
    margin-top: 0.3rem;
}

.success-message {
    color: #28a745;
    font-size: 0.9rem;
    margin-top: 0.3rem;
}

/* セクション */
.intro-section {
    background: #fff;
    padding: 1.5rem;
    margin-bottom: 1rem;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.intro-section h2 {
    color: #8b4513;
    margin-bottom: 0.5rem;
}

.intro-section ol,
.intro-section ul {
    padding-left: 1.5rem;
}

.intro-actions {
    display: flex;
    gap: 1rem;
    margin-top: 1.5rem;
    justify-content: center;
}

/* 学習の仕方ページ */
.guide-lead {
    margin-bottom: 1rem;
}

.guide-points {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    margin-bottom: 2rem;
}

.guide-point {
    position: relative;
    background: #fff;
    padding: 1.5rem 1.5rem 1.5rem 3.5rem;
    border-radius: 8px;
    border-left: 4px solid #8b4513;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.guide-point-number {
    position: absolute;
    left: 1rem;
    top: 1.4rem;
    width: 1.8rem;
    height: 1.8rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #8b4513;
    color: #fff;
    font-weight: 700;
    border-radius: 50%;
}

.guide-point h2 {
    color: #8b4513;
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}

.guide-point p {
    font-size: 0.95rem;
}

.guide-details-heading {
    color: #8b4513;
    margin-bottom: 1rem;
}

.guide-section {
    background: #fff;
    margin-bottom: 0.8rem;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.guide-section summary {
    padding: 1rem 1.5rem;
    font-weight: 700;
    color: #8b4513;
    cursor: pointer;
    list-style-position: inside;
}

.guide-section summary:hover {
    background: rgba(139, 69, 19, 0.05);
    border-radius: 8px;
}

.guide-section-body {
    padding: 0 1.5rem 1.5rem;
}

.guide-section-body ol,
.guide-section-body ul {
    padding-left: 1.5rem;
}

.guide-section-body li {
    margin-bottom: 0.5rem;
}

.guide-table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 1rem;
}

.guide-table th,
.guide-table td {
    border: 1px solid #ddd;
    padding: 0.6rem 0.8rem;
    text-align: left;
    vertical-align: top;
    font-size: 0.95rem;
}

.guide-table th {
    background: rgba(139, 69, 19, 0.08);
    color: #8b4513;
    white-space: nowrap;
}

.guide-schedule-notes dt {
    font-weight: 700;
    color: #8b4513;
    margin-top: 0.8rem;
}

.guide-schedule-notes dd {
    margin-left: 0;
    margin-bottom: 0.5rem;
}

/* カード */
.card {
    background: #fff;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    margin-bottom: 1rem;
}

h1 {
    color: #8b4513;
    margin-bottom: 1rem;
}

/* 認証画面 */
.auth-card {
    max-width: 440px;
    margin: 2rem auto;
    background: #fff;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.auth-card h1 {
    text-align: center;
    margin-bottom: 1.5rem;
}

.auth-description {
    color: #555;
    margin-bottom: 1.2rem;
    font-size: 0.95rem;
}

.auth-links {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-top: 1.2rem;
    text-align: center;
    font-size: 0.9rem;
}

.auth-links a {
    color: #8b4513;
    text-decoration: none;
}

.auth-links a:hover {
    text-decoration: underline;
}

.btn-block {
    width: 100%;
    margin-top: 0.5rem;
}

.field-hint {
    color: #777;
    font-size: 0.82rem;
    margin-top: 0.2rem;
}

.field-error {
    color: #dc3545;
    font-size: 0.85rem;
    margin-top: 0.2rem;
}

.required {
    color: #dc3545;
}

/* テーブル下のアクション */
.table-actions {
    margin-top: 1rem;
    display: flex;
    justify-content: flex-end;
}

/* ローディング */
.loading-text {
    color: #777;
    padding: 1rem 0;
}

/* パンくずリスト */
.page-breadcrumb {
    font-size: 0.85rem;
    color: #777;
    margin-bottom: 0.5rem;
}

.page-breadcrumb a {
    color: #8b4513;
    text-decoration: none;
}

.page-breadcrumb a:hover {
    text-decoration: underline;
}

/* テーブルアクション（ホームへ + 問題を解く） */
.table-actions {
    gap: 0.75rem;
}

/* 問題画面 */
.question-screen {
    max-width: 800px;
    margin: 0 auto;
}

.question-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.6rem 1.5rem;
    background: #fdf5ee;
    border-bottom: 1px solid #e8d5c0;
    flex-wrap: wrap;
    gap: 0.4rem;
}

.question-meta {
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

.back-link {
    color: #8b4513;
    text-decoration: none;
    font-size: 0.9rem;
}

.back-link:hover {
    text-decoration: underline;
}

.subcategory-label {
    font-weight: bold;
    color: #333;
}

.question-progress {
    color: #777;
    font-size: 0.9rem;
}

/* 柱文 */
.pillar-block {
    background: #fdf5ee;
    border-left: 4px solid #8b4513;
    padding: 0.75rem 1rem;
    margin: 1rem 0 0;
    border-radius: 0 4px 4px 0;
    font-size: 0.9rem;
    color: #555;
}

/* 問題文 */
.question-card {
    background: #fff;
    border-radius: 8px;
    padding: 1.25rem 1.5rem;
    margin: 0.75rem 0;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.question-text {
    font-size: 1.05rem;
    line-height: 1.7;
}

/* アコーディオン */
.accordion-block {
    margin: 0.5rem 0;
}

.accordion-toggle {
    width: 100%;
    text-align: left;
    background: #f5ede4;
    border: 1px solid #e8d5c0;
    border-radius: 4px;
    padding: 0.6rem 1rem;
    cursor: pointer;
    font-size: 0.9rem;
    color: #8b4513;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background-color 0.15s;
}

.accordion-toggle:hover {
    background: #eddfc9;
}

.accordion-content {
    background: #fff;
    border: 1px solid #e8d5c0;
    border-top: none;
    border-radius: 0 0 4px 4px;
    padding: 0.75rem 1rem;
    font-size: 0.95rem;
    line-height: 1.6;
}

/* 選択肢 */
.choices-block {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin: 1rem 0;
}

.choice-item {
    border: 2px solid #e0e0e0;
    border-radius: 6px;
    transition: border-color 0.15s, background-color 0.15s;
}

.choice-item:has(input:checked) {
    border-color: #8b4513;
    background: #fdf5ee;
}

.choice-item.choice-correct {
    border-color: #28a745;
    background: #f0fff4;
}

.choice-item.choice-wrong {
    border-color: #dc3545;
    background: #fff5f5;
}

.choice-label {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    cursor: pointer;
    width: 100%;
}

.choice-label input[type="radio"] {
    margin-top: 0.2rem;
    flex-shrink: 0;
    accent-color: #8b4513;
}

.choice-text {
    line-height: 1.5;
}

/* 回答ボタン */
.answer-btn-row {
    text-align: center;
    margin: 1rem 0;
}

.btn-answer {
    min-width: 160px;
    padding: 0.7rem 2rem;
    font-size: 1rem;
}

/* 正誤バッジ */
.result-badge {
    text-align: center;
    font-size: 1.5rem;
    font-weight: bold;
    padding: 0.5rem;
    margin: 0.75rem 0;
}

.result-badge.correct {
    color: #28a745;
}

.result-badge.wrong {
    color: #dc3545;
}

/* 解説 */
.explanation-block {
    background: #fafafa;
    border: 1px solid #eee;
    border-radius: 6px;
    padding: 1rem 1.25rem;
    margin: 0.75rem 0;
    line-height: 1.7;
    font-size: 0.95rem;
}

/* 解説の直下に表示する図解・比較表（解説と一体に見せる） */
.explanation-diagram {
    margin-top: 0.9rem;
}

.explanation-diagram svg {
    max-width: 100%;
}

/* 比較表（T13） */
.exp-diagram-table {
    width: 100%;
    border-collapse: collapse;
    margin: 0 auto;
    font-size: 0.9rem;
    line-height: 1.5;
}

.exp-diagram-table th,
.exp-diagram-table td {
    border: 1px solid #d6c6b2;
    padding: 0.5rem 0.7rem;
    text-align: left;
    vertical-align: top;
}

.exp-diagram-table thead th {
    background: #f0e6d8;
    color: #5a3d1e;
    text-align: center;
    font-weight: 700;
}

.exp-diagram-table tbody th[scope="row"] {
    background: #f7f1e8;
    color: #5a3d1e;
    white-space: nowrap;
    font-weight: 700;
}

.exp-diagram-caption {
    margin-top: 0.4rem;
    text-align: center;
    font-size: 0.82rem;
    color: #777;
}

/* アクションボタン群 */
.action-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
    margin-top: 1rem;
    justify-content: center;
}

.btn-mastered {
    background-color: #fff;
    color: #8b4513;
    border: 2px solid #8b4513;
}

.btn-mastered:hover {
    background-color: #fdf5ee;
}

.btn-mastered-active {
    background-color: #8b4513;
    color: #fff;
    border: 2px solid #8b4513;
}

.btn-mastered-active:hover {
    opacity: 0.85;
}

.btn-outline {
    background-color: #fff;
    color: #6c757d;
    border: 1px solid #6c757d;
}

.btn-outline:hover {
    background-color: #f8f9fa;
}

/* action-row (問題なしページなど) */
.action-row {
    display: flex;
    gap: 0.6rem;
    margin-top: 1rem;
}

/* 管理画面 */
.admin-bar {
    background-color: #333;
    color: #fff;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 1rem;
    height: 48px;
    position: sticky;
    top: 0;
    z-index: 100;
}

.admin-bar-brand {
    color: #fff;
    text-decoration: none;
    font-weight: bold;
    font-size: 1rem;
}

.admin-bar-nav {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.admin-bar-link {
    color: #ccc;
    text-decoration: none;
    font-size: 0.9rem;
}

.admin-bar-link:hover {
    color: #fff;
}

.admin-bar-btn {
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
}

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

.admin-page-header h1 {
    margin-bottom: 0;
}

.admin-actions {
    display: flex;
    gap: 0.4rem;
    white-space: nowrap;
}

.btn-small {
    padding: 0.3rem 0.8rem;
    font-size: 0.85rem;
}

.admin-form {
    max-width: 700px;
}

.admin-form textarea {
    width: 100%;
    padding: 0.5rem;
    border: 1px solid #ccc;
    border-radius: 4px;
    font-size: 1rem;
    font-family: inherit;
    resize: vertical;
}

.admin-form textarea:focus {
    border-color: #8b4513;
    outline: none;
    box-shadow: 0 0 0 2px rgba(139, 69, 19, 0.2);
}

.admin-form select {
    padding: 0.5rem;
    border: 1px solid #ccc;
    border-radius: 4px;
    font-size: 1rem;
    background: #fff;
}

.admin-form select:focus {
    border-color: #8b4513;
    outline: none;
}

.admin-input-disabled {
    background-color: #f5f5f5;
    color: #777;
    width: 100%;
    padding: 0.5rem;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 1rem;
}

.admin-subcategory-hint {
    color: #8b4513;
    font-weight: bold;
}

.admin-divider {
    border: none;
    border-top: 1px solid #eee;
    margin: 1.5rem 0;
}

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

.admin-form-error {
    background: #fff5f5;
    border: 1px solid #dc3545;
    border-radius: 4px;
    padding: 0.75rem 1rem;
    color: #dc3545;
    margin-bottom: 1rem;
}

/* レスポンシブ */
@media (max-width: 768px) {
    /* ヘッダー */
    .site-header {
        flex-wrap: wrap;
        padding: 0 1rem;
        gap: 0;
    }

    .header-top {
        flex: 1;
        justify-content: space-between;
        padding: 0.6rem 0;
        width: 100%;
    }

    .site-title {
        font-size: 0.95rem;
    }

    .hamburger-btn {
        display: flex;
    }

    .header-nav {
        display: none;
        flex-direction: column;
        align-items: stretch;
        flex-basis: 100%;
        border-top: 1px solid rgba(255, 255, 255, 0.2);
        padding-bottom: 0.5rem;
    }

    .header-nav.open {
        display: flex;
    }

    .tab-nav {
        flex-direction: column;
    }

    .tab {
        padding: 0.7rem 0.5rem;
        font-size: 0.95rem;
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }

    .auth-nav {
        padding: 0.7rem 0.5rem 0;
        border-top: 1px solid rgba(255, 255, 255, 0.1);
        margin-top: 0.25rem;
    }

    /* コンテンツ */
    .intro-actions {
        flex-direction: column;
        align-items: center;
    }

    .data-table {
        font-size: 0.85rem;
    }

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

    .guide-points {
        grid-template-columns: 1fr;
    }

    .guide-table th,
    .guide-table td {
        font-size: 0.85rem;
        padding: 0.4rem 0.5rem;
    }

    .guide-table th {
        white-space: normal;
    }
}