/* ==========================================
   システム全体のUI用CSS（学習用HTMLには干渉しません）
   ========================================== */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    user-select: none;
}

/* カスタムスクロールバー */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}
::-webkit-scrollbar-track {
    background: #f1f5f9;
    border-radius: 10px;
}
::-webkit-scrollbar-thumb {
    background: #cbd5e1;
    border-radius: 10px;
}
::-webkit-scrollbar-thumb:hover {
    background: #94a3b8;
}

body {
    font-family: 'Helvetica Neue', Arial, 'Hiragino Kaku Gothic ProN', Meiryo, sans-serif;
    height: 100vh;
    display: flex;
    flex-direction: column;
    background-color: #eef2f6;
    color: #1e293b;
    padding: 12px;
    gap: 10px;
    overflow: hidden;
    transition: background-color 0.2s, color 0.2s;
}

/* ==========================================
   1. スリムヘッダー
   ========================================== */
header {
    height: 52px;
    background-color: #ffffff;
    border: 3px solid #cbd5e1;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 16px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.02);
    flex-shrink: 0;
    transition: background-color 0.2s, border-color 0.2s;
}

.header-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: 2px 10px 2px 2px !important;
    box-sizing: border-box;
    gap: 12px;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 16px;
    min-width: 0;
    overflow-x: auto;
}
.logo {
    width: 32px;
    height: 32px;
    background-color: #3b82f6;
    color: #ffffff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 900;
    font-size: 1.1rem;
    box-shadow: 0 2px 4px rgba(59, 130, 246, 0.3);
}
.chapter-nav {
    display: flex;
    gap: 8px;
    flex-shrink: 0;
}
.chapter-btn {
    background-color: #f1f5f9;
    border: 2px solid #cbd5e1;
    color: #64748b;
    padding: 4px 12px;
    border-radius: 8px;
    font-size: 0.85rem;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.15s ease;
    white-space: nowrap;
    flex-shrink: 0;
}
.chapter-btn:hover {
    background-color: #e2e8f0;
    color: #475569;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 10px;
}

/* ==========================================
   2. 下部メインコンテンツエリア
   ========================================== */
.main-content {
    flex: 1;
    display: flex;
    align-items: center;
    gap: 0px; 
    min-height: 0;
}

.workspace {
    display: flex;
    flex-direction: column;
    height: 100%;
    background-color: #ffffff;
    border-radius: 16px;
    border: 3px solid #cbd5e1;
    overflow: hidden;
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.05);
    transition: background-color 0.2s, border-color 0.2s;
}

.workspace-left {
    flex: 1.25;
    height: 100%;
}
.workspace-right {
    flex: 0.75;
    height: 100%;
}

.main-divider {
    display: flex;
    justify-content: center;
    align-items: flex-start;
    width: 40px;
    height: 100%;
    flex-shrink: 0;
}

.right-arrow {
    width: 0;
    height: 0;
    border-top: 10px solid transparent;
    border-bottom: 10px solid transparent;
    border-left: 12px solid #94a3b8;
    filter: drop-shadow(1px 1px 0px #ffffff);
    margin-top: 200px;
}

.workspace-header {
    height: 48px;
    padding: 0 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 1rem;
    font-weight: bold;
    border-bottom: 3px solid #cbd5e1;
    flex-shrink: 0;
    transition: border-color 0.2s;
}
.left-header {
    background-color: #3b82f6;
    color: #ffffff;
}

.right-header {
    background-color: #10b981;
    color: #ffffff;
}

.left-main-content {
    flex: 1;
    display: flex;
    min-height: 0;
    background-color: #f8fafc;
    padding: 10px;
    gap: 10px;
    transition: background-color 0.2s;
}

/* 課題・説明エリア：380px */
.instruction-card {
    width: 380px;
    background-color: #ffffff;
    border-radius: 12px;
    border: 2px solid #e2e8f0;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    flex-shrink: 0;
    transition: background-color 0.2s, border-color 0.2s;
}
.instruction-title {
    background-color: #f1f5f9;
    padding: 10px;
    font-size: 0.9rem;
    font-weight: bold;
    color: #2563eb;
    border-bottom: 2px solid #e2e8f0;
    text-align: center;
    transition: background-color 0.2s, border-color 0.2s;
}

/* 説明文と採点ボタンのレイアウト調整 */
.instruction-body-wrapper {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 0;
}
.instruction-body {
    flex: 1;
    overflow-y: auto;
    padding: 12px;
    font-size: 0.8rem;
    line-height: 1.5;
    color: #475569;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

/* 解説内の中見出し（はとまるの挑戦など） */
.instruction-body h3 {
    font-size: 0.85rem;
    font-weight: bold;
    color: #1e293b;
    border-left: 4px solid #3b82f6;
    padding-left: 8px;
    margin-top: 4px;
    margin-bottom: -4px;
}
.instruction-body hr {
    border: none;
    border-top: 1px solid #e2e8f0;
}

/* ==========================================
   💬 チャット風（吹き出し）スタイル
   ========================================== */
.chat-row {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    width: 100%;
}

/* 丸い「はとまる」アイコン */
.chat-avatar {
    width: 64px;
    height: 64px;
    background-color: #e2e8f0;
    background-image: url('images/hatomalu.webp'); 
    background-size: cover; 
    background-position: center; 
    border-radius: 50%;
    border: 0px solid #cbd5e1;
    flex-shrink: 0;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

/* 吹き出し風コンテナ */
.chat-bubble {
    position: relative;
    background-color: #ffffff;
    border: 2px solid #cbd5e1;
    border-radius: 14px;
    padding: 10px 12px;
    color: #334155;
    font-size: 0.8rem;
    line-height: 1.5;
    flex: 1;
    box-shadow: 0 2px 4px rgba(0,0,0,0.02);
}

.chat-bubble::before {
    content: "";
    position: absolute;
    left: -8px;
    top: 24px; 
    border-width: 5px 8px 5px 0;
    border-style: solid;
    border-color: transparent #cbd5e1 transparent transparent;
}
.chat-bubble::after {
    content: "";
    position: absolute;
    left: -6px;
    top: 24px; 
    border-width: 5px 8px 5px 0;
    border-style: solid;
    border-color: transparent #ffffff transparent transparent;
}

.chat-bubble strong {
    color: #1e293b;
}

/* 採点ボタンを配置するフッターエリア */
.instruction-footer {
    padding: 10px 12px 14px 12px;
    border-top: 2px solid #e2e8f0;
    background-color: #f8fafc;
    display: flex;
    justify-content: center;
    flex-shrink: 0;
    transition: background-color 0.2s, border-color 0.2s;
}

/* 大きめの「採点！」ボタン */
.grade-btn {
    width: 100%;
    max-width: 280px;
    border: none;
    padding: 10px 0;
    border-radius: 10px;
    font-weight: bold;
    font-size: 1.05rem;
    letter-spacing: 2px;
    cursor: pointer;
    transition: all 0.15s ease;
}
.grade-btn:hover {
    transform: translateY(-1.5px);
}
.grade-btn:active {
    transform: translateY(0.5px);
}

/* ==========================================
   おさらい用シンプルテーブルデザイン
   ========================================== */
.guide-table-box {
    background-color: #fffbeb;
    border: 2px dashed #fcd34d;
    border-radius: 12px;
    padding: 10px;
    width: 100%;
    overflow: visible; 
}
.guide-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.75rem;
    text-align: left;
    table-layout: auto; 
}
.guide-table th, .guide-table td {
    padding: 8px 6px;
    border-bottom: 1px solid #fef3c7;
    white-space: normal; 
}
.guide-table th {
    font-weight: bold;
    color: #b45309;
    background-color: #fef3c7;
    border-radius: 4px;
}
.guide-table td {
    color: #4b5563;
}
.tag-cell {
    font-family: monospace;
    font-weight: bold;
    color: #e11d48;
    white-space: nowrap; 
}

.guide-table th:last-child, 
.guide-table td:last-child {
    white-space: normal; 
}

/* エディタ枠 */
.editor-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 0;
}

.panel {
    flex: 1;
    background-color: #ffffff;
    border: 2px solid #e2e8f0;
    border-radius: 12px;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    min-height: 0;
    transition: background-color 0.2s, border-color 0.2s;
}
.panel-label {
    background-color: #f1f5f9;
    padding: 6px 12px;
    font-size: 0.85rem;
    font-weight: bold;
    color: #475569;
    border-bottom: 2px solid #cbd5e1;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 36px;
    flex-shrink: 0;
    transition: background-color 0.2s, border-color 0.2s;
}
.panel-title-text {
    display: flex;
    align-items: center;
    gap: 6px;
}

/* データの流れを示す▼矢印 */
.arrow-divider {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 24px;
    position: relative;
    flex-shrink: 0;
}
.css-arrow {
    width: 0;
    height: 0;
    border-left: 8px solid transparent;
    border-right: 8px solid transparent;
    border-top: 10px solid #cbd5e1;
}

.panel-body {
    flex: 1;
    position: relative;
    height: 100%;
    min-height: 0;
}

/* Aceエディタ配置調整 */
#editor, #sample-code {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    width: 100%;
    height: 100%;
}

#editor * {
    user-select: text !important;
}
#sample-code, #sample-code * {
    user-select: none !important;
    -webkit-user-select: none !important;
    -moz-user-select: none !important;
    -ms-user-select: none !important;
}

/* 🌟 完成見本エディタ内だけの折りたたみ用プラス・マイナスアイコンと矢印を完全に非表示にする */
#sample-code .ace_fold-widget {
    display: none !important;
}

/* 3桁（100行〜）でも文字が詰まらず、右側に程よい余白を作る */
.ace_gutter-cell {
    padding-left: 7px !important;
    padding-right: 7px !important;
    text-align: right !important;
}




/* iframeプレビューエリア */
iframe {
    width: 100%;
    height: 100%;
    border: none;
    background-color: #ffffff !important;
}

/* 右側：タブ切替 */
.tab-buttons {
    display: flex;
    gap: 6px;
}
.tab-btn {
    background-color: rgba(255, 255, 255, 0.2);
    color: #ffffff;
    border: 2px solid #ffffff;
    padding: 3px 12px;
    border-radius: 6px;
    font-weight: bold;
    font-size: 0.8rem;
    cursor: pointer;
    transition: all 0.15s ease;
}
.tab-btn:hover {
    background-color: rgba(255, 255, 255, 0.3);
}
.tab-btn.active {
    background-color: #ffffff;
    color: #10b981;
}

.tab-content {
    display: none;
    flex: 1;
    flex-direction: column;
    padding: 8px;
    background-color: #f8fafc;
    min-height: 0;
    transition: background-color 0.2s;
}
.tab-content.active {
    display: flex !important;
}

/* 操作用リセットボタン */
.browser-btn {
    background: #ffffff;
    border: 2px solid #cbd5e1;
    border-radius: 6px;
    padding: 2px 8px;
    font-size: 0.75rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    color: #475569;
    transition: all 0.15s ease;
}
.browser-btn:hover {
    background: #3b82f6;
    color: #ffffff;
    border-color: #3b82f6;
}
.browser-btn-sample:hover {
    background: #10b981;
    color: #ffffff;
    border-color: #10b981;
}

/* モーダル */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: rgba(15, 23, 42, 0.6);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}
.modal {
    background-color: #ffffff;
    border-radius: 20px;
    border: 4px solid #10b981;
    padding: 30px;
    width: 380px;
    text-align: center;
    box-shadow: 0 20px 25px -5px rgba(0,0,0,0.2);
    transform: scale(0.9);
    transition: all 0.2s ease;
}
.modal.active {
    transform: scale(1);
}
.modal-icon {
    font-size: 3.5rem;
    margin-bottom: 12px;
}
.modal-title {
    font-size: 1.5rem;
    font-weight: 800;
    color: #047857;
    margin-bottom: 8px;
}
.modal-desc {
    font-size: 0.9rem;
    color: #475569;
    margin-bottom: 20px;
    line-height: 1.4;
}
.modal-btn {
    background-color: #10b981;
    color: #ffffff;
    border: none;
    padding: 10px 24px;
    border-radius: 10px;
    font-weight: bold;
    font-size: 1rem;
    cursor: pointer;
    box-shadow: 0 4px 6px rgba(16, 185, 129, 0.2);
}
.modal-btn:hover {
    background-color: #059669;
}

/* ==========================================
   ⌨️ キーボード記号ガイドのレイアウト
   ========================================== */
#keyboard-guide-container {
    border-top: 2px solid #e2e8f0;
    background-color: #f8fafc;
    overflow: hidden;
    transition: all 0.2s ease-out;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-shrink: 0;
}

.keyboard-guide-hidden {
    height: 0;
    padding: 0;
    opacity: 0;
    pointer-events: none;
}

.keyboard-guide-shown {
    height: 200px;
    padding-bottom: 2px;
    opacity: 1;
}

.keyboard-guide-img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    pointer-events: none;
}

/* ==========================================
   🖼️ ロゴ ＆ コース選択モーダルウィンドウ
   ========================================== */
.logo-area {
    width: 140px; 
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    border-radius: 8px;
    flex-shrink: 0;
    border: 3px solid #f97316; /* 初期状態の枠色 */
    box-shadow: 0 4px 10px rgba(249, 115, 22, 0.15);
    transition: all 0.3s ease;
    box-sizing: border-box;
}

.logo-img {
    width: 100%;
    height: 100%;
    object-fit: cover; 
}

.course-trigger-btn {
    padding: 8px 16px; 
    font-size: 0.95rem;
    font-weight: bold;
    color: #ffffff !important; 
    border: none;
    border-radius: 8px;
    cursor: pointer;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    white-space: nowrap;
}
.course-trigger-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 10px -1px rgba(0, 0, 0, 0.15);
}

#app-header {
    border-left: 3px solid #cbd5e1;
    padding-left: 15px;
    transition: border-color 0.3s ease;
}

.course-modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(15, 23, 42, 0.6); 
    backdrop-filter: blur(4px); 
    display: none; 
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    transition: opacity 0.25s ease;
}
.course-modal-overlay.active {
    display: flex;
    opacity: 1;
}

.course-modal-card {
    background-color: #ffffff;
    width: 90%;
    max-width: 840px;
    border-radius: 16px;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.2);
    padding: 24px;
    transform: scale(0.9);
    transition: transform 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
}
.course-modal-overlay.active .course-modal-card {
    transform: scale(1);
}

.course-modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 2px solid #f1f5f9; /* 消えていた下の線を復活 */
    padding-bottom: 12px;
    margin-bottom: 20px;
}
.course-modal-header h3 {
    margin: 0;
    font-size: 1.4rem;
    font-weight: 800; /* しっかりとした太字 */
    letter-spacing: 0.05em; /* 文字の間に少しゆとりを持たせて洗練された印象に */
    color: #1e293b;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}
.course-modal-close {
    background: none;
    border: none;
    font-size: 2rem;
    cursor: pointer;
    color: #94a3b8;
    line-height: 1;
    transition: color 0.2s;
}
.course-modal-close:hover {
    color: #475569;
}

.course-card-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

.course-select-card {
    border: 2px solid #e2e8f0;
    border-radius: 12px;
    padding: 20px;
    cursor: pointer;
    transition: all 0.25s ease;
    display: flex;
    flex-direction: column;
    position: relative;
    overflow: hidden;
}
.course-select-card h4 {
    margin: 12px 0 8px 0;
    font-size: 1.05rem;
    color: #1e293b;
}
.course-select-card p {
    margin: 0 0 16px 0;
    font-size: 0.85rem;
    color: #64748b;
    line-height: 1.5;
    flex-grow: 1;
}
.course-card-action {
    font-size: 0.85rem;
    font-weight: bold;
    transition: transform 0.2s ease;
}

.course-card-badge {
    align-self: flex-start;
    padding: 4px 12px;
    font-size: 0.75rem;
    font-weight: 900;
    border-radius: 20px;
    color: #ffffff;
}

.badge-html { background-color: #d96226; }
.badge-css  { background-color: #3182ce; }
.badge-js   { background-color: #d69e2e; color: #ffffff; }

.card-html:hover {
    border-color: #d96226;
    background-color: rgba(217, 98, 38, 0.02);
    transform: translateY(-4px);
    box-shadow: 0 10px 15px -3px rgba(217, 98, 38, 0.1);
}
.card-html:hover .course-card-action { color: #d96226; }

.card-css:hover {
    border-color: #3182ce;
    background-color: rgba(49, 130, 206, 0.02);
    transform: translateY(-4px);
    box-shadow: 0 10px 15px -3px rgba(49, 130, 206, 0.1);
}
.card-css:hover .course-card-action { color: #3182ce; }

.card-js:hover {
    border-color: #d69e2e;
    background-color: rgba(214, 158, 46, 0.02);
    transform: translateY(-4px);
    box-shadow: 0 10px 15px -3px rgba(214, 158, 46, 0.1);
}
.card-js:hover .course-card-action { color: #d69e2e; }

/* 🌟 現在選択されているコースの無効化・強調用追加クラス */
.course-select-card.current-active {
    pointer-events: none; /* クリック不可 */
    opacity: 0.55; /* 選択中であることを示す半透明化 */
    border: 3px dashed #cbd5e1; /* 主張しすぎないプレーンなグレーの破線枠 */
    background-color: #f8fafc !important;
    transform: none !important;
    box-shadow: none !important;
}
.course-select-card.current-active .course-card-action {
    display: none; /* 「このコースをはじめる」を非表示に */
}
.course-select-card.current-active::after {
    content: "現在のコース";
    position: absolute;
    right: 12px;
    top: 20px;
    background-color: #64748b; /* バッジもシンプルなグレーに統一 */
    color: #ffffff;
    font-size: 0.7rem;
    font-weight: bold;
    padding: 3px 8px;
    border-radius: 6px;
}

/* ==========================================
   ⚡ コース動的カラー連動（ライトモード）
   ========================================== */
.left-header, .grade-btn {
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease !important;
}

/* 🟠 HTMLコース */
.course-html .left-header {
    background-color: #d96226 !important; /* 強すぎず深みのあるテラコッタオレンジ */
    color: #ffffff !important;
}
.course-html .instruction-title {
    color: #d96226 !important; /* 「はじめに」等の文字色をテーマカラーのオレンジに変更 */
}
.course-html .chapter-btn.active {
    background-color: #d96226 !important;
    border-color: #b84e1a !important;
    color: #ffffff !important;
}
.course-html .grade-btn {
    background-color: #d96226 !important;
    border: 1px solid #b84e1a !important;
    color: #ffffff !important;
    box-shadow: 0 4px 6px rgba(217, 98, 38, 0.25) !important;
}
.course-html .grade-btn:hover {
    background-color: #b84e1a !important;
}

/* 🔵 CSSコース */
.course-css .left-header {
    background-color: #3182ce !important; /* さっきより明るく鮮やかなアクアブルー */
    color: #ffffff !important;
}
.course-css .instruction-title {
    color: #3182ce !important; /* 「はじめに」等の文字色をテーマカラーのアクアブルーに変更 */
}
.course-css .chapter-btn.active {
    background-color: #3182ce !important;
    border-color: #2b6cb0 !important;
    color: #ffffff !important;
}
.course-css .grade-btn {
    background-color: #3182ce !important;
    border: 1px solid #2b6cb0 !important;
    color: #ffffff !important;
    box-shadow: 0 4px 6px rgba(49, 130, 206, 0.25) !important;
}
.course-css .grade-btn:hover {
    background-color: #2b6cb0 !important;
}

/* 🟡 JS with AIコース */
.course-js .left-header {
    background-color: #d69e2e !important; /* 白文字が映える、強すぎないマスタードゴールド */
    color: #ffffff !important;
}
.course-js .instruction-title {
    color: #d69e2e !important; /* 「はじめに」等の文字色をテーマカラーのマスタードゴールドに変更 */
}
.course-js .chapter-btn.active {
    background-color: #d69e2e !important;
    border-color: #b78420 !important;
    color: #ffffff !important;
}
.course-js .grade-btn {
    background-color: #d69e2e !important;
    border: 1px solid #b78420 !important;
    color: #ffffff !important;
    box-shadow: 0 4px 6px rgba(214, 158, 46, 0.25) !important;
}
.course-js .grade-btn:hover {
    background-color: #b78420 !important;
    color: #ffffff !important;
}

/* ==========================================
   🌙 ダークモードスタイル（上書き構造）
   ========================================== */
body.dark-mode {
    background-color: #0f172a !important;
    color: #f1f5f9 !important; /* 全体のベース文字色を明るい白系に変更 */
}
body.dark-mode header {
    background-color: #1e293b !important;
    border-color: #334155 !important;
}
body.dark-mode .chapter-btn {
    background-color: #334155 !important;
    border-color: #475569 !important;
    color: #94a3b8 !important;
}
body.dark-mode .chapter-btn:hover {
    background-color: #475569 !important;
    color: #f1f5f9 !important;
}
body.dark-mode .workspace {
    background-color: #1e293b !important;
    border-color: #334155 !important;
}
body.dark-mode .workspace-header {
    border-color: #334155 !important;
}
body.dark-mode .left-main-content,
body.dark-mode .tab-content {
    background-color: #0f172a !important;
}
body.dark-mode .instruction-card,
body.dark-mode .panel {
    background-color: #1e293b !important;
    border-color: #334155 !important;
}
body.dark-mode .instruction-title,
body.dark-mode .panel-label {
    background-color: #1e293b !important;
    border-color: #334155 !important;
    color: #94a3b8 !important;
}
body.dark-mode .instruction-body {
    color: #f1f5f9 !important; /* 解説エリア内の文字色をしっかり白い文字にする */
}
body.dark-mode .instruction-body p {
    color: #f1f5f9 !important; /* pタグで書かれた中身も確実に白い文字にする */
}
/* インラインスタイルで背景グレーが指定されているルール表示ボックスのダークモード対応 */
body.dark-mode .instruction-body p[style*="background-color"] {
    background-color: #0f172a !important; /* 背景を暗い色に上書き */
    color: #38bdf8 !important; /* コードらしく見やすい鮮やかなライトブルーに変更 */
    border: 1px solid #334155 !important;
}
body.dark-mode .instruction-body p[style*="background-color"] strong {
    color: #f1f5f9 !important; /* ボックス内の強強調（タイトル）は白にする */
}
body.dark-mode .instruction-body h3 {
    color: #ffffff !important;
    border-left-color: #3182ce !important;
}
body.dark-mode .instruction-body hr {
    border-top-color: #334155 !important;
}
body.dark-mode .chat-bubble {
    background-color: #1e293b !important;
    border-color: #334155 !important;
    color: #cbd5e1 !important;
}
body.dark-mode .chat-bubble::before {
    border-color: transparent #334155 transparent transparent !important;
}
body.dark-mode .chat-bubble::after {
    border-color: transparent #1e293b transparent transparent !important;
}
body.dark-mode .chat-avatar {
    background-color: #334155 !important;
    border-color: #475569 !important;
}
body.dark-mode .instruction-footer {
    background-color: #1e293b !important;
    border-top-color: #334155 !important;
}
body.dark-mode .guide-table-box {
    background-color: #1e1b4b !important;
    border-color: #4338ca !important;
}
body.dark-mode .guide-table th {
    background-color: #312e81 !important;
    color: #c7d2fe !important;
}
body.dark-mode .guide-table td {
    color: #94a3b8 !important;
    border-bottom-color: #312e81 !important;
}
body.dark-mode .browser-btn {
    background-color: #334155 !important;
    border-color: #475569 !important;
    color: #cbd5e1 !important;
}
body.dark-mode .browser-btn:hover {
    background-color: #3b82f6 !important;
    color: #ffffff !important;
    border-color: #3b82f6 !important;
}
body.dark-mode .browser-btn-sample:hover {
    background-color: #10b981 !important;
    color: #ffffff !important;
    border-color: #10b981 !important;
}
body.dark-mode .tab-btn:not(.active) {
    border-color: #475569 !important;
}
body.dark-mode .css-arrow {
    border-top-color: #334155 !important;
}
body.dark-mode #keyboard-guide-container {
    border-top-color: #334155 !important;
    background-color: #1e293b !important;
}
body.dark-mode .chat-bubble strong {
    color: #ffffff !important; 
}
body.dark-mode #app-header {
    border-left-color: #475569;
}

/* ==========================================
   🌙 ダークモード×コース選択モーダル（上書き）
   ========================================== */
body.dark-mode .course-modal-card {
    background-color: #1e293b;
}
body.dark-mode .course-modal-header {
    border-bottom: 2px solid #334155 !important; /* ダークモード用の区切り線 */
}
body.dark-mode .course-modal-header h3 {
    color: #f8fafc;
}
body.dark-mode .course-modal-close {
    color: #94a3b8;
}
body.dark-mode .course-modal-close:hover {
    color: #f1f5f9;
}
body.dark-mode .course-select-card {
    border-color: #334155;
}
body.dark-mode .course-select-card h4 {
    color: #f1f5f9;
}
body.dark-mode .course-select-card p {
    color: #94a3b8;
}
body.dark-mode .logo-area {
    background-color: #1e293b;
}

/* 🌟 現在選択されているコースのダークモード用上書き */
body.dark-mode .course-select-card.current-active {
    border: 3px dashed #475569 !important; /* ダークモードの背景に馴染むグレーの破線枠 */
    background-color: #1e293b !important;
}
body.dark-mode .course-select-card.current-active::after {
    background-color: #475569 !important; /* バッジも落ち着いたダークグレーに統一 */
    color: #f1f5f9 !important;
}



/* ==========================================
   🖼️ 結果と見本エリア（上下分割・明確なタブ切替デザイン）
   ========================================== */
.workspace-right {
    display: flex;
    flex-direction: column;
    gap: 8px;
    background-color: transparent !important;
    border: none !important;
    box-shadow: none !important;
}

/* 上段・下段のカード枠 */
.my-result-section, .sample-section {
    flex: 1;
    display: flex;
    flex-direction: column;
    background-color: #ffffff;
    border-radius: 16px;
    border: 3px solid #cbd5e1;
    overflow: hidden;
    min-height: 0;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.05);
}

.sample-header {
    background-color: #1e293b;
    color: #ffffff;
}

/* 🌟 切替ボタン群（カプセル状のスイッチ感） */
.sample-tab-switch-group {
    display: inline-flex;
    background-color: rgba(109, 109, 109, 0.651);
    padding: 3px;
    border-radius: 8px;
    gap: 2px;
}

.sample-tab-btn {
    background-color: transparent;
    color: rgba(255, 255, 255, 0.8);
    border: none;
    padding: 4px 12px;
    border-radius: 6px;
    font-weight: bold;
    font-size: 0.8rem;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 4px;
}

.sample-tab-btn:hover {
    color: #ffffff;
    background-color: rgba(255, 255, 255, 0.15);
}

/* アクティブ（選択中）ボタンをはっきり際立たせる */
.sample-tab-btn.active {
    background-color: #ffffff !important;
    color: #1e293b !important;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.15);
}

/* iframeと表示エリア */
.iframe-container {
    flex: 1;
    width: 100%;
    height: 100%;
    min-height: 0;
}

.sample-content-container {
    flex: 1;
    position: relative;
    width: 100%;
    height: 100%;
    min-height: 0;
}

.sample-tab-content {
    display: none;
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
}

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

/* ダークモード対応 */
body.dark-mode .my-result-section,
body.dark-mode .sample-section {
    background-color: #1e293b !important;
    border-color: #334155 !important;
}



/* ==========================================
   ✨ 次のミッション強調アニメーション（やんわり黄色）
   ========================================== */
@keyframes nextChapterGlow {
    0% {
        box-shadow: 0 0 0px rgba(234, 179, 8, 0.2);
        border-color: #cbd5e1;
    }
    50% {
        box-shadow: 0 0 12px rgba(234, 179, 8, 0.75);
        border-color: #eab308;
        background-color: #fefce8;
        color: #854d0e;
    }
    100% {
        box-shadow: 0 0 0px rgba(234, 179, 8, 0.2);
        border-color: #cbd5e1;
    }
}

.chapter-btn.next-highlight {
    animation: nextChapterGlow 2s infinite ease-in-out;
    z-index: 10;
}



/* ==========================================
   チャプターナビゲーションの区切り矢印
   ========================================== */
.chapter-nav {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
}

.chapter-nav-arrow {
    font-size: 0.65rem;
    color: #94a3b8;
    user-select: none;
    flex-shrink: 0;
    opacity: 0.7;
}

/* ダークモード時の区切り矢印 */
body.dark-mode .chapter-nav-arrow {
    color: #475569;
}


/* ==========================================
   課題・説明エリア：テキスト選択とコピーを常に許可
   ========================================== */
.instruction-card,
.instruction-card * {
    user-select: text !important;
    -webkit-user-select: text !important;
    -moz-user-select: text !important;
    -ms-user-select: text !important;
}

/* ボタン類やアバターなど選択不要なUIパーツのみ選択不可を維持 */
.instruction-footer,
.instruction-footer *,
.tut-btn,
.chat-avatar {
    user-select: none !important;
    -webkit-user-select: none !important;
    -moz-user-select: none !important;
    -ms-user-select: none !important;
}





/* ==========================================
   📷 提出ボタン
   ========================================== */
.submit-trigger-btn {
    background: linear-gradient(135deg, #10b981, #059669);
    border: none;
    border-radius: 6px;
    padding: 6px 14px;
    font-size: 0.85rem;
    font-weight: bold;
    color: #ffffff;
    cursor: pointer;
    box-shadow: 0 2px 4px rgba(16, 185, 129, 0.25);
    white-space: nowrap;
    transition: all 0.15s ease;
    display: flex;
    align-items: center;
    gap: 4px;
}
.submit-trigger-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(16, 185, 129, 0.35);
    background: linear-gradient(135deg, #059669, #047857);
}

/* ==========================================
   📷 成果確認モーダル（ヘッダー統合・省スペース版）
   ========================================== */
.submit-modal-card {
    max-width: 860px !important;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    padding: 18px 20px !important;
}

/* ヘッダー内にタイトルと名前入力/表示を横並び配置 */
.submit-modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 2px solid #f1f5f9;
    padding-bottom: 10px;
    margin-bottom: 12px;
}

.submit-header-left {
    display: flex;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
}

.submit-header-left h3 {
    margin: 0;
    font-size: 1.25rem;
    white-space: nowrap;
}

.student-info-section {
    display: flex;
    align-items: center;
}

/* 生徒情報：入力中 */
.student-input-card {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background-color: #f8fafc;
    border: 1.5px solid #cbd5e1;
    border-radius: 8px;
    padding: 4px 8px;
}
.student-input-group {
    display: flex;
    align-items: center;
    gap: 4px;
}
.student-class-group input {
    width: 45px;
    text-align: center;
}
.student-name-group input {
    width: 120px;
}
.student-input-group label {
    font-size: 0.78rem;
    font-weight: bold;
    color: #475569;
    white-space: nowrap;
}
.student-input-group input {
    padding: 4px 6px;
    font-size: 0.8rem;
    border: 1px solid #cbd5e1;
    border-radius: 4px;
    outline: none;
    transition: border-color 0.2s;
}
.student-input-group input:focus {
    border-color: #3b82f6;
}
.student-confirm-btn {
    background-color: #2563eb;
    color: white;
    border: none;
    border-radius: 4px;
    padding: 5px 10px;
    font-size: 0.75rem;
    font-weight: bold;
    cursor: pointer;
    white-space: nowrap;
    transition: background-color 0.15s;
}
.student-confirm-btn:hover {
    background-color: #1d4ed8;
}

/* 🌟 「※一度確定すると、～」注意書きスタイル */
.student-input-note {
    font-size: 0.7rem;
    color: #ef4444;
    margin-left: 8px;
    white-space: nowrap;
}

/* 生徒情報：確定ロック後 */
.student-fixed-card {
    display: inline-flex;
    align-items: center;
    gap: 14px;
    background-color: #ecfdf5;
    border: 1.5px solid #6ee7b7;
    border-radius: 8px;
    padding: 4px 10px;
}
.student-fixed-item {
    display: flex;
    align-items: baseline;
    gap: 4px;
}
.student-fixed-item .label {
    font-size: 0.72rem;
    font-weight: bold;
    color: #065f46;
}
.student-fixed-item .value {
    font-size: 0.88rem;
    font-weight: 800;
    color: #047857;
}
.student-lock-badge {
    font-size: 0.68rem;
    font-weight: bold;
    color: #059669;
    background: #ffffff;
    padding: 2px 6px;
    border-radius: 12px;
    border: 1px solid #a7f3d0;
}

/* 提出進捗コンテナ */
.submit-progress-container {
    flex: 1;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 12px;
    padding-right: 4px;
}
.submit-course-block {
    background-color: #ffffff;
    border: 2px solid #e2e8f0;
    border-radius: 12px;
    padding: 12px 14px;
}
.submit-course-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 2px solid #f1f5f9;
    padding-bottom: 6px;
    margin-bottom: 10px;
}
.submit-course-rate {
    font-size: 0.85rem;
    font-weight: bold;
    color: #64748b;
}
.submit-course-rate.complete {
    color: #059669;
}

/* 程よい余白の2段課題カードグリッド */
.submit-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
    gap: 8px;
}
.submit-item-card {
    border-radius: 8px;
    padding: 8px 10px;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    justify-content: space-between;
    gap: 6px;
    border: 2px solid #e2e8f0;
    min-height: 56px;
}
.submit-item-title {
    font-size: 0.82rem;
    font-weight: bold;
    color: #1e293b;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    width: 100%;
}
.submit-item-badge {
    font-size: 0.7rem;
    font-weight: bold;
    padding: 2px 8px;
    border-radius: 4px;
    white-space: nowrap;
}

/* クリア済み */
.submit-item-card.status-done {
    background-color: #f0fdf4;
    border-color: #86efac;
}
.submit-item-card.status-done .submit-item-badge {
    background-color: #22c55e;
    color: #ffffff;
}

/* 未クリア */
.submit-item-card.status-yet {
    background-color: #f8fafc;
    border-color: #cbd5e1;
    opacity: 0.7;
}
.submit-item-card.status-yet .submit-item-badge {
    background-color: #94a3b8;
    color: #ffffff;
}

/* ==========================================
   🌙 ダークモード完全対応（成果確認モーダル）
   ========================================== */
body.dark-mode .submit-modal-header {
    border-bottom-color: #334155;
}
body.dark-mode .student-input-card {
    background-color: #0f172a;
    border-color: #334155;
}
body.dark-mode .student-input-group label {
    color: #94a3b8;
}
body.dark-mode .student-input-group input {
    background-color: #1e293b;
    border-color: #475569;
    color: #f8fafc;
}
body.dark-mode .student-input-note {
    color: #f87171;
}
body.dark-mode .student-fixed-card {
    background-color: #064e3b;
    border-color: #059669;
}
body.dark-mode .student-fixed-item .label {
    color: #a7f3d0;
}
body.dark-mode .student-fixed-item .value {
    color: #ffffff;
}
body.dark-mode .student-lock-badge {
    background-color: #065f46;
    color: #a7f3d0;
    border-color: #047857;
}
body.dark-mode .submit-course-block {
    background-color: #0f172a;
    border-color: #334155;
}
body.dark-mode .submit-course-header {
    border-bottom-color: #334155;
}
body.dark-mode .submit-course-header strong {
    color: #f8fafc;
}
body.dark-mode .submit-course-rate {
    color: #94a3b8;
}
body.dark-mode .submit-course-rate.complete {
    color: #34d399;
}
body.dark-mode .submit-item-card.status-done {
    background-color: #064e3b;
    border-color: #059669;
}
body.dark-mode .submit-item-card.status-done .submit-item-title {
    color: #ffffff;
}
body.dark-mode .submit-item-card.status-yet {
    background-color: #1e293b;
    border-color: #334155;
}
body.dark-mode .submit-item-card.status-yet .submit-item-title {
    color: #94a3b8;
}





/* ==========================================
   💡 失敗モーダルスタイル
   ========================================== */
.modal-fail {
    border-color: #f59e0b !important;
}

.fail-icon {
    font-size: 3.5rem;
    margin-bottom: 12px;
}

.fail-title {
    color: #d97706 !important;
}

.fail-btn {
    background-color: #f59e0b !important;
    box-shadow: 0 4px 6px rgba(245, 158, 11, 0.25) !important;
}

.fail-btn:hover {
    background-color: #d97706 !important;
}

/* ダークモード時の失敗モーダル */
body.dark-mode .modal-fail {
    background-color: #1e293b !important;
    border-color: #d97706 !important;
}

body.dark-mode .fail-title {
    color: #fbbf24 !important;
}