/* python-pf.css — Python学習プラットフォーム専用スタイル */
/* top.css のCSS変数を前提とする */

/* ===== PFトップ: ヒーロー ===== */
.pf-hero {
    padding: 100px 24px 72px;
    background: linear-gradient(160deg, var(--blue-50) 0%, #fff 60%);
}

.pf-hero-inner {
    max-width: 760px;
    margin: 0 auto;
    text-align: center;
}

.pf-hero-label {
    display: inline-block;
    font-family: var(--font-display);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--blue-600);
    text-transform: uppercase;
    letter-spacing: 0.12em;
    padding: 4px 16px;
    background: rgba(37,99,235,0.08);
    border-radius: 20px;
    margin-bottom: 20px;
}

.pf-hero-title {
    font-size: 2.4rem;
    font-weight: 800;
    color: var(--gray-900);
    line-height: 1.25;
    margin-bottom: 16px;
}

.pf-hero-title span {
    color: var(--blue-600);
}

.pf-hero-desc {
    font-size: 1rem;
    color: var(--gray-600);
    line-height: 1.85;
    margin-bottom: 24px;
}

.pf-hero-tags {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px;
    margin-bottom: 28px;
}

.pf-hero-tag {
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--blue-700);
    background: rgba(37,99,235,0.08);
    padding: 5px 14px;
    border-radius: 999px;
}

.pf-curriculum-box {
    background: #fff;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: 24px;
}

.pf-curriculum-header {
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--gray-400);
    padding-bottom: 12px;
    border-bottom: 1px solid var(--gray-100);
    margin-bottom: 4px;
}

.pf-unit-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.pf-unit-list li {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 9px 0;
    font-size: 0.88rem;
    font-weight: 500;
    color: var(--gray-700);
    border-bottom: 1px solid var(--gray-50);
}

.pf-unit-list li:last-child {
    border-bottom: none;
}

.pf-unit-num {
    font-size: 0.68rem;
    font-weight: 700;
    color: var(--blue-600);
    background: rgba(37,99,235,0.08);
    padding: 2px 8px;
    border-radius: 4px;
    white-space: nowrap;
    font-family: 'JetBrains Mono', monospace;
}

.pf-unit-range {
    margin-left: auto;
    font-size: 0.72rem;
    color: var(--gray-400);
    font-family: 'JetBrains Mono', monospace;
}

/* ===== PFトップ: コースオーバービュー（ヒーロー右カラム） ===== */
.pf-overview-list {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.pf-overview-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 10px;
    border-radius: var(--radius-md);
    text-decoration: none;
    transition: background 0.15s;
    border-bottom: 1px solid var(--gray-50);
}

a.pf-overview-item:hover {
    background: var(--blue-50);
}

.pf-overview-item--coming {
    opacity: 0.6;
}

.pf-overview-icon {
    font-size: 1.4rem;
    flex-shrink: 0;
}

.pf-overview-info {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.pf-overview-title {
    font-size: 0.88rem;
    font-weight: 700;
    color: var(--gray-800);
}

.pf-overview-meta {
    font-size: 0.73rem;
    color: var(--gray-400);
}

.pf-overview-badge {
    font-size: 0.65rem;
    font-weight: 700;
    padding: 2px 8px;
    border-radius: 999px;
    white-space: nowrap;
}

.pf-overview-badge--free {
    background: rgba(16,185,129,0.12);
    color: #059669;
}

.pf-overview-badge--coming {
    background: var(--gray-100);
    color: var(--gray-500);
}

@media (max-width: 600px) {
    .pf-hero-title {
        font-size: 1.8rem;
    }
}

/* ===== コースグリッド ===== */
.pf-section {
    max-width: 1080px;
    margin: 0 auto;
    padding: 64px 24px;
}

.pf-section-title {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--gray-900);
    text-align: center;
    margin-bottom: 8px;
}

.pf-section-desc {
    font-size: 0.92rem;
    color: var(--gray-500);
    text-align: center;
    margin-bottom: 40px;
}

.course-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

@media (max-width: 900px) {
    .course-grid {
        grid-template-columns: 1fr;
        max-width: 480px;
        margin: 0 auto;
    }
}

.course-card {
    background: #fff;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    padding: 32px 28px;
    display: flex;
    flex-direction: column;
    transition: all 0.3s;
    position: relative;
}

.course-card:hover:not(.course-card--coming) {
    border-color: var(--blue-200);
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.course-card--coming {
    opacity: 0.7;
    background: var(--gray-50);
}

.course-badge {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 700;
    padding: 3px 12px;
    border-radius: 20px;
    margin-bottom: 20px;
    letter-spacing: 0.05em;
    width: fit-content;
}

.badge-free {
    background: #dcfce7;
    color: #15803d;
}

.badge-coming {
    background: var(--gray-100);
    color: var(--gray-500);
}

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

.course-icon {
    font-size: 2.2rem;
    margin-bottom: 16px;
}

.course-card-title {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 10px;
}

.course-card-desc {
    font-size: 0.88rem;
    color: var(--gray-600);
    line-height: 1.7;
    flex-grow: 1;
    margin-bottom: 24px;
}

.course-meta {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin-bottom: 24px;
}

.course-meta-item {
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 0.78rem;
    color: var(--gray-500);
}

.course-meta-icon {
    color: var(--blue-400);
}

.course-card-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 20px;
    background: var(--blue-600);
    color: #fff;
    border-radius: var(--radius-md);
    font-size: 0.88rem;
    font-weight: 600;
    text-decoration: none;
    transition: background 0.2s;
    width: fit-content;
}

.course-card-link:hover {
    background: var(--blue-700);
}

.course-card-link--disabled {
    background: var(--gray-200);
    color: var(--gray-500);
    cursor: not-allowed;
    pointer-events: none;
}

/* ===== CTAセクション ===== */
.pf-cta-section {
    background: linear-gradient(135deg, var(--blue-600) 0%, var(--blue-800) 100%);
    padding: 64px 24px;
    text-align: center;
    color: #fff;
}

.pf-cta-title {
    font-size: 1.6rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.pf-cta-desc {
    font-size: 0.95rem;
    opacity: 0.85;
    margin-bottom: 32px;
    line-height: 1.7;
}

.pf-cta-buttons {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn-outline-white {
    padding: 10px 24px;
    border: 2px solid rgba(255,255,255,0.6);
    color: #fff;
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.2s;
}

.btn-outline-white:hover {
    background: rgba(255,255,255,0.15);
    border-color: #fff;
}

/* ===== レッスンページ ===== */

/* レッスンヒーロー */
.lesson-hero {
    padding: 100px 24px 40px;
    background: linear-gradient(170deg, var(--blue-50) 0%, #fff 70%);
}

.lesson-hero-inner {
    max-width: 1080px;
    margin: 0 auto;
}

.breadcrumb-nav {
    margin-bottom: 16px;
}

.breadcrumb-list {
    display: flex;
    align-items: center;
    gap: 6px;
    list-style: none;
    padding: 0;
    margin: 0;
    flex-wrap: wrap;
}

.breadcrumb-list a {
    font-size: 0.8rem;
    color: var(--gray-400);
    text-decoration: none;
}

.breadcrumb-list a:hover {
    color: var(--blue-600);
}

.breadcrumb-sep {
    font-size: 0.8rem;
    color: var(--gray-300);
}

.breadcrumb-list li:last-child {
    font-size: 0.8rem;
    color: var(--gray-600);
}

.lesson-number {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--blue-600);
    background: var(--blue-100);
    padding: 3px 12px;
    border-radius: 20px;
    margin-bottom: 12px;
    font-family: var(--font-display);
    letter-spacing: 0.05em;
}

.lesson-hero-title {
    font-size: 1.9rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 16px;
    line-height: 1.3;
}

.lesson-goals {
    background: #fff;
    border: 1px solid var(--blue-100);
    border-left: 4px solid var(--blue-500);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    padding: 16px 20px;
    margin-top: 20px;
    max-width: 640px;
}

.lesson-goals-title {
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--blue-600);
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.lesson-goals ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.lesson-goals li {
    font-size: 0.88rem;
    color: var(--gray-700);
    padding: 3px 0;
    padding-left: 20px;
    position: relative;
}

.lesson-goals li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--blue-500);
    font-weight: 700;
}

/* ===== 2ペインレイアウト ===== */
.lesson-main {
    max-width: 1280px;
    margin: 0 auto;
    padding: 32px 24px 64px;
}

.lesson-layout {
    display: flex;
    gap: 28px;
    align-items: flex-start;
}

.lesson-content {
    flex: 1;
    min-width: 0;
}

.editor-pane {
    width: 480px;
    flex-shrink: 0;
    position: sticky;
    top: 80px;
}

@media (max-width: 960px) {
    .lesson-layout {
        flex-direction: column;
    }
    .editor-pane {
        width: 100%;
        position: static;
    }
}

/* ===== レッスンコンテンツ ===== */
.lesson-section {
    margin-bottom: 40px;
}

.lesson-section h2 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--gray-900);
    border-bottom: 2px solid var(--blue-100);
    padding-bottom: 8px;
    margin-bottom: 16px;
}

.lesson-section h3 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--gray-800);
    margin: 20px 0 8px;
}

.lesson-section p {
    font-size: 0.93rem;
    color: var(--gray-700);
    line-height: 1.85;
    margin-bottom: 12px;
}

.lesson-section ul,
.lesson-section ol {
    font-size: 0.93rem;
    color: var(--gray-700);
    line-height: 1.85;
    padding-left: 24px;
    margin-bottom: 12px;
}

/* コードサンプル（解説用） */
.code-block {
    background: #1e1e2e;
    border-radius: var(--radius-md);
    margin: 16px 0;
    overflow: hidden;
}

.code-block-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 16px;
    background: rgba(255,255,255,0.06);
    border-bottom: 1px solid rgba(255,255,255,0.08);
}

.code-label {
    font-size: 0.72rem;
    font-weight: 600;
    color: #cdd6f4;
    font-family: var(--font-display);
    letter-spacing: 0.08em;
}

.code-copy-btn {
    font-size: 0.72rem;
    color: #a6adc8;
    background: none;
    border: none;
    cursor: pointer;
    padding: 2px 8px;
    border-radius: 4px;
    transition: background 0.15s;
}

.code-copy-btn:hover {
    background: rgba(255,255,255,0.1);
}

.code-block pre {
    margin: 0;
    padding: 20px;
    overflow-x: auto;
}

.code-block code {
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
    font-size: 0.88rem;
    line-height: 1.7;
    color: #cdd6f4;
}

/* シンタックスカラー */
.kw  { color: #cba6f7; } /* キーワード: purple */
.st  { color: #a6e3a1; } /* 文字列: green */
.cm  { color: #6c7086; } /* コメント: gray */
.fn  { color: #89b4fa; } /* 関数: blue */
.nb  { color: #fab387; } /* 組み込み: orange */
.op  { color: #89dceb; } /* 演算子: cyan */

/* スキップ可ノート（AI知識がある方向け注記） */
.section-note {
    background: #fffbeb;
    border: 1px solid #fde68a;
    border-left: 4px solid #f59e0b;
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    padding: 12px 16px;
    margin: 0 0 16px;
    font-size: 0.88rem;
    color: #78350f;
    line-height: 1.7;
}
.section-note strong {
    color: #92400e;
}

/* インフォボックス */
.info-box {
    background: var(--blue-50);
    border: 1px solid var(--blue-200);
    border-left: 4px solid var(--blue-500);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    padding: 16px 20px;
    margin: 16px 0;
}

/* info-box / hint-content 内の pre ブロック横スクロール */
.info-box pre,
.hint-content pre,
.doc-section pre {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.info-box p {
    margin: 0;
    font-size: 0.88rem;
    color: var(--blue-900, #0c1e3a);
}

.info-box strong {
    color: var(--blue-700);
}

/* ===== 練習問題 ===== */
.exercise-box {
    background: #fff;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    padding: 24px;
    margin: 20px 0;
}

.exercise-number {
    display: inline-block;
    font-size: 0.72rem;
    font-weight: 700;
    color: #fff;
    background: var(--blue-500);
    padding: 2px 10px;
    border-radius: 12px;
    margin-bottom: 10px;
    font-family: var(--font-display);
    letter-spacing: 0.05em;
}

.exercise-title {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 8px;
}

.exercise-desc {
    font-size: 0.88rem;
    color: var(--gray-600);
    line-height: 1.7;
    margin-bottom: 16px;
}

.hint-toggle {
    margin-top: 12px;
}

.hint-toggle summary {
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--blue-600);
    cursor: pointer;
    user-select: none;
    list-style: none;
    display: flex;
    align-items: center;
    gap: 6px;
}

.hint-toggle summary::-webkit-details-marker { display: none; }

.hint-toggle summary::before {
    content: '▶';
    font-size: 0.65rem;
    transition: transform 0.2s;
}

.hint-toggle[open] summary::before {
    transform: rotate(90deg);
}

/* ===== ヒント内コードブロック + 穴埋め箇所ハイライト ===== */
.hint-content pre {
    margin: 10px 0 4px;
    padding: 12px 14px;
    background: rgba(0,0,0,0.06);
    border-radius: 6px;
    overflow-x: auto;
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
    font-size: 0.84rem;
    line-height: 1.8;
}

.hint-content pre code {
    background: none;
    padding: 0;
    border-radius: 0;
    font-family: inherit;
    font-size: inherit;
}

/* 穴埋め箇所（追記すべき行）: 左ボーダー＋緑ハイライト */
/* display: block を廃止 → <pre>内の\nが匿名ブロックになり空白行が出る問題を解消 */
.hint-content pre code mark {
    background: rgba(16, 185, 129, 0.22);
    color: inherit;
    border-left: 3px solid #10b981;
    padding: 1px 3px 1px 6px;
    margin-left: -3px;
    font-style: normal;
    border-radius: 0 2px 2px 0;
}

.hint-content {
    margin-top: 12px;
    padding: 12px 16px;
    background: #fef9c3;
    border-radius: var(--radius-md);
    font-size: 0.85rem;
    color: #713f12;
    line-height: 1.7;
}

.hint-content code {
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
    background: rgba(0,0,0,0.08);
    padding: 1px 5px;
    border-radius: 4px;
}

/* ===== コードエディタペイン ===== */
.editor-card {
    background: #1e1e2e;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-xl, 0 20px 48px rgba(0,0,0,0.18));
}

.editor-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 16px;
    background: rgba(255,255,255,0.05);
    border-bottom: 1px solid rgba(255,255,255,0.08);
}

.editor-toolbar-left {
    display: flex;
    align-items: center;
    gap: 12px;
}

.editor-dots {
    display: flex;
    gap: 6px;
}

.editor-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.dot-red   { background: #ff5f57; }
.dot-yellow{ background: #febc2e; }
.dot-green { background: #28c840; }

.editor-filename {
    font-size: 0.75rem;
    color: #6c7086;
    font-family: 'JetBrains Mono', monospace;
}

.editor-shortcut {
    font-size: 0.68rem;
    color: #6c7086;
}

.code-editor {
    display: block;
    width: 100%;
    min-height: 200px;
    padding: 20px;
    background: #1e1e2e;
    color: #cdd6f4;
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
    font-size: 0.88rem;
    line-height: 1.7;
    border: none;
    resize: vertical;
    outline: none;
    tab-size: 4;
    box-sizing: border-box;
    caret-color: #89b4fa;
}

.code-editor::selection {
    background: rgba(137, 180, 250, 0.2);
}

.editor-actions {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    background: rgba(255,255,255,0.03);
    border-top: 1px solid rgba(255,255,255,0.06);
}

.btn-run {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 20px;
    background: #10b981;
    color: #fff;
    border: none;
    border-radius: var(--radius-md);
    font-size: 0.88rem;
    font-weight: 700;
    cursor: pointer;
    transition: background 0.2s, transform 0.1s;
    font-family: var(--font-display);
}

.btn-run:hover:not(:disabled) {
    background: #059669;
    transform: translateY(-1px);
}

.btn-run:disabled {
    background: #374151;
    color: #6b7280;
    cursor: not-allowed;
    transform: none;
}

.btn-clear {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 8px 14px;
    background: transparent;
    color: #6c7086;
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: var(--radius-md);
    font-size: 0.82rem;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-clear:hover {
    background: rgba(255,255,255,0.06);
    color: #cdd6f4;
}

/* 出力エリア */
.output-section {
    border-top: 1px solid rgba(255,255,255,0.06);
}

.output-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 16px;
    background: rgba(255,255,255,0.03);
}

.output-label {
    font-size: 0.72rem;
    font-weight: 600;
    color: #6c7086;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.editor-output {
    min-height: 80px;
    max-height: 240px;
    overflow-y: auto;
    padding: 16px 20px;
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
    font-size: 0.85rem;
    line-height: 1.7;
    white-space: pre-wrap;
    word-break: break-all;
    color: #a6e3a1;
}

.editor-output:empty::before {
    content: '出力がここに表示されます';
    color: #45475a;
    font-style: italic;
    font-size: 0.8rem;
}

.output-text {
    display: block;
    color: #a6e3a1;
}

.output-error {
    display: block;
    color: #f38ba8;
}

/* ===== ローディングオーバーレイ ===== */
.loading-overlay {
    position: absolute;
    inset: 0;
    background: rgba(30, 30, 46, 0.92);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-lg);
    z-index: 10;
}

.loading-content {
    text-align: center;
}

.loading-spinner {
    width: 36px;
    height: 36px;
    border: 3px solid rgba(255,255,255,0.1);
    border-top-color: #10b981;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin: 0 auto 12px;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.loading-text {
    font-size: 0.85rem;
    color: #cdd6f4;
    margin-bottom: 4px;
}

.loading-sub {
    font-size: 0.75rem;
    color: #6c7086;
}

.loading-error {
    font-size: 0.85rem;
    color: #f38ba8;
    margin-bottom: 4px;
}

.loading-error-detail {
    font-size: 0.75rem;
    color: #6c7086;
    margin-bottom: 16px;
}

.btn-reload {
    padding: 8px 20px;
    background: #10b981;
    color: #fff;
    border: none;
    border-radius: var(--radius-md);
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
}

/* ===== レッスンナビ ===== */
.lesson-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px 0;
    border-top: 1px solid var(--gray-200);
    margin-top: 40px;
    gap: 16px;
}

.lesson-nav-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 20px;
    background: #fff;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-md);
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--gray-700);
    text-decoration: none;
    transition: all 0.2s;
}

.lesson-nav-link:hover {
    border-color: var(--blue-300);
    color: var(--blue-600);
    background: var(--blue-50);
}

.lesson-nav-link--disabled {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}

.lesson-nav-link--next {
    background: var(--blue-600);
    border-color: var(--blue-600);
    color: #fff;
}

.lesson-nav-link--next:hover {
    background: var(--blue-700);
    border-color: var(--blue-700);
    color: #fff;
}

/* ===== 広告コンテナ ===== */
.ad-container {
    margin: 32px 0;
    text-align: center;
}

/* ===== ユーティリティ ===== */
.container {
    max-width: 1080px;
    margin: 0 auto;
    padding: 0 24px;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 24px;
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.2s;
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--blue-600);
    color: #fff;
}

.btn-primary:hover {
    background: var(--blue-700);
}

.btn-outline {
    background: transparent;
    color: var(--blue-600);
    border: 2px solid var(--blue-300);
}

.btn-outline:hover {
    background: var(--blue-50);
    border-color: var(--blue-500);
}

/* =====================================================
   Jupyter型マルチセルレイアウト
   ===================================================== */

/* ===== Pyodide 読み込みバナー（固定・ヘッダー直下） ===== */
.pyodide-loading-banner {
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    z-index: 200;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 8px 24px;
    background: var(--blue-700);
    color: #fff;
    font-size: 0.82rem;
    font-weight: 500;
    box-shadow: 0 2px 8px rgba(0,0,0,0.2);
}

.loading-spinner.small {
    width: 16px;
    height: 16px;
    border-width: 2px;
}

/* ===== ドキュメント型レイアウト（Jupyter風シングルカラム） ===== */
.lesson-doc {
    max-width: 860px;
    margin: 0 auto;
    padding: 40px 24px 80px;
}

.doc-section {
    margin-bottom: 48px;
}

/* ===== レッスン内テーブル ===== */
.table-scroll {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    margin: 10px 0;
}
.table-scroll .lesson-table {
    margin: 0;
    min-width: 480px;
}

.lesson-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.88rem;
    margin: 20px 0;
}

.lesson-table th {
    background: var(--blue-600);
    color: #fff;
    text-align: left;
    padding: 10px 14px;
    font-weight: 600;
}

.lesson-table td {
    padding: 10px 14px;
    border-bottom: 1px solid var(--gray-100);
    color: var(--gray-700);
    vertical-align: top;
}

.lesson-table tr:nth-child(even) td {
    background: var(--gray-50);
}

.lesson-table td code {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.82rem;
    background: rgba(37,99,235,0.06);
    padding: 1px 5px;
    border-radius: 3px;
}

.doc-section h2 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--gray-900);
    border-bottom: 2px solid var(--blue-100);
    padding-bottom: 8px;
    margin-bottom: 16px;
}

.doc-section h3 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--gray-800);
    margin: 20px 0 8px;
}

.doc-section p {
    font-size: 0.93rem;
    color: var(--gray-700);
    line-height: 1.85;
    margin-bottom: 12px;
}

.doc-section ul,
.doc-section ol {
    font-size: 0.93rem;
    color: var(--gray-700);
    line-height: 1.85;
    padding-left: 24px;
    margin-bottom: 12px;
}

/* ===== コードセル（Jupyter風） ===== */
.code-cell {
    margin: 20px 0;
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 1px solid #313244;
    background: #1e1e2e;
}

.cell-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 14px;
    background: #181825;
    border-bottom: 1px solid #313244;
}

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

.cell-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

.cell-editor {
    display: block;
    width: 100%;
    min-height: 60px;
    padding: 16px 20px;
    background: #1e1e2e;
    color: #cdd6f4;
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
    font-size: 0.875rem;
    line-height: 1.7;
    border: none;
    outline: none;
    resize: none;
    box-sizing: border-box;
    tab-size: 4;
    caret-color: #89b4fa;
    overflow: hidden;
}

.cell-editor::selection {
    background: rgba(137, 180, 250, 0.2);
}

/* 出力エリア */
.cell-output-area {
    border-top: 1px solid rgba(255,255,255,0.05);
}

.cell-output-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 5px 14px;
    background: rgba(255,255,255,0.03);
}

.cell-output {
    padding: 10px 20px;
    min-height: 36px;
    background: #1e1e2e;
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
    font-size: 0.84rem;
    line-height: 1.7;
    white-space: pre-wrap;
    word-break: break-all;
}

.cell-output:empty::before {
    content: '実行すると出力がここに表示されます';
    color: #45475a;
    font-style: italic;
    font-size: 0.78rem;
}

/* 練習問題セル: ヘッダー色を変えて区別 */
.code-cell--exercise {
    border-color: #45475a;
}

.code-cell--exercise .cell-header {
    background: #12121e;
    border-bottom-color: #45475a;
}

/* ===== 練習問題コンテナ（Jupyter版） ===== */
.exercise-block {
    background: #fff;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    padding: 20px 24px;
    margin: 16px 0;
}

.exercise-block .exercise-number {
    display: inline-block;
    font-size: 0.72rem;
    font-weight: 700;
    color: #fff;
    background: var(--blue-500);
    padding: 2px 10px;
    border-radius: 12px;
    margin-bottom: 8px;
    font-family: var(--font-display);
    letter-spacing: 0.05em;
}

.exercise-block .exercise-title {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 6px;
}

.exercise-block .exercise-desc {
    font-size: 0.88rem;
    color: var(--gray-600);
    line-height: 1.7;
    margin-bottom: 14px;
}

/* まとめボックス */
.summary-box {
    background: var(--blue-50);
    border: 1px solid var(--blue-200);
    border-radius: var(--radius-lg);
    padding: 20px 24px;
    margin: 24px 0;
}

.summary-box h3 {
    font-size: 0.88rem;
    font-weight: 700;
    color: var(--blue-700);
    margin-bottom: 10px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.summary-box ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.summary-box li {
    font-size: 0.9rem;
    color: var(--gray-800);
    padding: 4px 0;
    padding-left: 22px;
    position: relative;
}

.summary-box li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--blue-500);
    font-weight: 700;
}

/* ===== レッスン完了ボタン ===== */
.lesson-complete-area {
    text-align: center;
    padding: 32px 0 8px;
    margin-top: 16px;
    border-top: 1px solid var(--gray-100);
}

.btn-lesson-complete {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 13px 36px;
    background: #10b981;
    color: #fff;
    border: none;
    border-radius: var(--radius-md);
    font-size: 0.97rem;
    font-weight: 700;
    cursor: pointer;
    transition: background 0.2s, transform 0.15s;
    font-family: var(--font-body);
    letter-spacing: 0.02em;
}

.btn-lesson-complete:hover:not(:disabled) {
    background: #059669;
    transform: translateY(-2px);
}

.btn-lesson-complete.completed {
    background: var(--blue-600);
    cursor: default;
    transform: none;
}

.btn-lesson-complete:disabled {
    cursor: default;
    transform: none;
}

.lesson-complete-hint {
    margin-top: 10px;
    font-size: 0.78rem;
    color: var(--gray-400);
}

/* ===== コースカード: ミニ進捗 ===== */
.course-card-progress {
    font-size: 0.82rem;
    font-weight: 600;
    color: #059669;
    margin: 8px 0 0;
}

/* ===== コース詳細ページ: ヒーロー ===== */
.course-detail-hero {
    background: linear-gradient(170deg, var(--blue-50) 0%, #fff 65%);
    padding: 100px 24px 56px;
    border-bottom: 1px solid var(--gray-200);
}

.cdh-body {
    display: flex;
    gap: 40px;
    align-items: flex-start;
    margin-top: 24px;
}

.cdh-info {
    flex: 1;
    min-width: 0;
}

.cdh-label {
    display: inline-block;
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--blue-600);
    background: rgba(37,99,235,0.08);
    padding: 4px 12px;
    border-radius: 999px;
    margin-bottom: 14px;
}

.cdh-title {
    font-size: 2rem;
    font-weight: 800;
    color: var(--gray-900);
    line-height: 1.3;
    margin-bottom: 16px;
}

.cdh-desc {
    font-size: 0.95rem;
    color: var(--gray-600);
    line-height: 1.8;
    margin-bottom: 20px;
}

.cdh-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--gray-700);
}

/* ===== コース詳細: 進捗カード ===== */
.course-progress-card {
    width: 300px;
    flex-shrink: 0;
    background: #fff;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: 28px 24px;
}

.cpg-label-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.cpg-label {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--gray-700);
}

.cpg-count {
    font-size: 1rem;
    font-weight: 800;
    color: var(--blue-600);
}

.cpg-bar-bg {
    width: 100%;
    height: 10px;
    background: var(--gray-200);
    border-radius: 999px;
    overflow: hidden;
    margin-bottom: 12px;
}

.cpg-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--blue-600), #10b981);
    border-radius: 999px;
    transition: width 0.6s ease;
}

.cpg-hint {
    font-size: 0.78rem;
    color: var(--gray-400);
    margin-bottom: 20px;
}

.cpg-cta {
    display: block;
    text-align: center;
    width: 100%;
    box-sizing: border-box;
}

@media (max-width: 768px) {
    .cdh-body {
        flex-direction: column;
    }
    .course-progress-card {
        width: 100%;
    }
    .cdh-title {
        font-size: 1.6rem;
    }
}

/* ===== コース詳細: レッスン一覧 ===== */
.cdi-main {
    padding-top: 48px;
    padding-bottom: 72px;
}

.lesson-unit {
    margin-bottom: 40px;
}

.unit-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 0 12px;
    border-bottom: 2px solid var(--blue-600);
    margin-bottom: 4px;
}

.unit-badge {
    font-size: 0.72rem;
    font-weight: 800;
    letter-spacing: 0.06em;
    color: #fff;
    background: var(--blue-600);
    padding: 3px 10px;
    border-radius: 999px;
    white-space: nowrap;
}

.unit-title {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--gray-900);
    flex: 1;
    margin: 0;
}

.unit-meta {
    font-size: 0.8rem;
    color: var(--gray-400);
    white-space: nowrap;
}

.lesson-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.lesson-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 14px 16px;
    border-bottom: 1px solid var(--gray-100);
    transition: background 0.15s;
}

.lesson-item:hover:not(.lesson-item--locked) {
    background: var(--blue-50);
}

.lesson-item--locked {
    opacity: 0.55;
}

.lesson-item--done {
    background: rgba(16,185,129,0.04);
}

.lesson-num {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--gray-400);
    width: 24px;
    flex-shrink: 0;
    font-family: 'JetBrains Mono', monospace;
}

.lesson-info {
    flex: 1;
    min-width: 0;
}

.lesson-title {
    display: block;
    font-size: 0.92rem;
    font-weight: 600;
    color: var(--gray-900);
    text-decoration: none;
    margin-bottom: 3px;
}

a.lesson-title:hover {
    color: var(--blue-600);
    text-decoration: underline;
}

.lesson-tags {
    font-size: 0.76rem;
    color: var(--gray-400);
    font-family: 'JetBrains Mono', monospace;
}

.lesson-diff {
    font-size: 0.78rem;
    color: var(--gray-400);
    white-space: nowrap;
    width: 72px;
    flex-shrink: 0;
}

.lesson-time {
    font-size: 0.78rem;
    color: var(--gray-400);
    white-space: nowrap;
    width: 52px;
    flex-shrink: 0;
}

.lesson-status {
    font-size: 1rem;
    width: 28px;
    text-align: center;
    flex-shrink: 0;
}

.lesson-status[data-status="available"] {
    color: var(--blue-600);
}

.lesson-status[data-status="done"] {
    color: #10b981;
}

@media (max-width: 600px) {
    .lesson-diff,
    .lesson-time {
        display: none;
    }
    .unit-meta {
        display: none;
    }
}

/* ===== PFトップ: 進捗バー ===== */
.pf-progress-section {
    background: var(--blue-50);
    border-bottom: 1px solid var(--gray-200);
    padding: 20px 24px;
}

.pf-progress-inner {
    max-width: 640px;
    margin: 0 auto;
}

.pf-progress-label {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: 8px;
}

.pf-progress-bar-bg {
    width: 100%;
    height: 10px;
    background: var(--gray-200);
    border-radius: 999px;
    overflow: hidden;
}

.pf-progress-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--blue-600), #10b981);
    border-radius: 999px;
    transition: width 0.6s ease;
}


/* =====================================================
   CodeMirror — Catppuccin Mocha テーマ & レイアウト統合
   ===================================================== */

/* --- セル内のCMコンテナ基本スタイル --- */
.code-cell .CodeMirror {
    height: auto;
    min-height: 72px;
    font-family: 'JetBrains Mono', 'Fira Code', 'Courier New', monospace;
    font-size: 0.875rem;
    line-height: 1.7;
    border-radius: 0 0 0 0;   /* .code-cell の border-radius に委ねる */
}

/* オートハイト：コンテンツ分だけ縦に伸びる */
.code-cell .CodeMirror-scroll {
    overflow-y: hidden !important;
    overflow-x: auto !important;
}

/* 行番号ガター */
.code-cell .CodeMirror-gutters {
    border-right: 1px solid #313244;
}

/* =====================================================
   Catppuccin Mocha テーマ定義
   bg: #1e1e2e  text: #cdd6f4
   ===================================================== */
.cm-s-catppuccin-mocha.CodeMirror {
    background: #1e1e2e;
    color: #cdd6f4;
}

/* ガター（行番号エリア） */
.cm-s-catppuccin-mocha .CodeMirror-gutters {
    background: #181825;
    color: #585b70;
    border-right: 1px solid #313244;
}
.cm-s-catppuccin-mocha .CodeMirror-linenumber {
    color: #585b70;
    padding: 0 8px 0 4px;
    min-width: 28px;
    text-align: right;
}

/* カーソル */
.cm-s-catppuccin-mocha .CodeMirror-cursor {
    border-left: 2px solid #f5e0dc;
}

/* 選択範囲 - CodeMirror オーバーレイ */
.cm-s-catppuccin-mocha .CodeMirror-selected {
    background: rgba(88, 91, 112, 0.45);
}
/* focused 時はセレクタを同一要素に（空白なし） */
.cm-s-catppuccin-mocha.CodeMirror-focused .CodeMirror-selected {
    background: rgba(88, 91, 112, 0.55);
}
/* ブラウザネイティブ ::selection も同色で上書き（白く塗りつぶされる問題を防ぐ） */
.cm-s-catppuccin-mocha .CodeMirror-line::selection,
.cm-s-catppuccin-mocha .CodeMirror-line > span::selection,
.cm-s-catppuccin-mocha .CodeMirror-line > span > span::selection {
    background: rgba(88, 91, 112, 0.45);
    color: inherit;
}

/* アクティブ行ハイライト */
.cm-s-catppuccin-mocha .CodeMirror-activeline-background {
    background: #26263d;
}

/* --- シンタックストークン --- */

/* キーワード: def, class, if, for, while, return, import... */
.cm-s-catppuccin-mocha .cm-keyword {
    color: #cba6f7;     /* mauve */
}

/* 組み込み関数: print, len, range, type... */
.cm-s-catppuccin-mocha .cm-builtin {
    color: #89b4fa;     /* blue */
}

/* 文字列・文字列テンプレート */
.cm-s-catppuccin-mocha .cm-string,
.cm-s-catppuccin-mocha .cm-string-2 {
    color: #a6e3a1;     /* green */
}

/* 数値 */
.cm-s-catppuccin-mocha .cm-number {
    color: #fab387;     /* peach */
}

/* コメント */
.cm-s-catppuccin-mocha .cm-comment {
    color: #6c7086;     /* overlay0 */
    font-style: italic;
}

/* 演算子 */
.cm-s-catppuccin-mocha .cm-operator {
    color: #89dceb;     /* sky */
}

/* def/class の直後の名前（関数名・クラス名） */
.cm-s-catppuccin-mocha .cm-def {
    color: #89b4fa;     /* blue */
}

/* 変数・識別子（デフォルト） */
.cm-s-catppuccin-mocha .cm-variable,
.cm-s-catppuccin-mocha .cm-variable-2,
.cm-s-catppuccin-mocha .cm-variable-3 {
    color: #cdd6f4;     /* text */
}

/* デコレータ（@property等） */
.cm-s-catppuccin-mocha .cm-meta {
    color: #fab387;     /* peach */
}

/* 括弧・区切り記号 */
.cm-s-catppuccin-mocha .cm-punctuation {
    color: #a6adc8;     /* subtext0 */
}

/* エラートークン */
.cm-s-catppuccin-mocha .cm-error {
    color: #f38ba8;     /* red */
    background: rgba(243, 139, 168, 0.1);
}

/* ブラケットマッチ */
.cm-s-catppuccin-mocha .CodeMirror-matchingbracket {
    color: #a6e3a1 !important;
    outline: 1px solid #a6e3a1;
}

/* スクロールバー */
.code-cell .CodeMirror-vscrollbar,
.code-cell .CodeMirror-hscrollbar {
    cursor: default;
}
.code-cell .CodeMirror-hscrollbar::-webkit-scrollbar {
    height: 6px;
}
.code-cell .CodeMirror-hscrollbar::-webkit-scrollbar-track {
    background: #181825;
}
.code-cell .CodeMirror-hscrollbar::-webkit-scrollbar-thumb {
    background: #45475a;
    border-radius: 3px;
}

/* モバイル: 横スクロール許可 */
@media (max-width: 768px) {
    .code-cell .CodeMirror {
        font-size: 0.82rem;
    }
}

/* ===== ヘッダーの実行ボタン・ショートカットを非表示（下部バーに統合） ===== */
.cell-header .cell-run-btn,
.cell-header .editor-shortcut {
    display: none;
}

/* ===== 練習セルのリセットボタン（右上）===== */
.cell-header .cell-reset-btn {
    color: #a6adc8;
    border-color: rgba(255, 255, 255, 0.22);
    padding: 5px 12px;
    font-size: 0.78rem;
}

.cell-header .cell-reset-btn:hover {
    color: #cdd6f4;
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.38);
}

/* ===== 下部実行ボタンバー ===== */
.cell-bottom-bar {
    display: flex;
    justify-content: flex-end;
    align-items: center;
    gap: 10px;
    padding: 8px 12px 10px;
    border-top: 1px solid rgba(255, 255, 255, 0.06);
    background: #1e1e2e;
    border-radius: 0 0 8px 8px;
}

.cell-run-btn-bottom {
    font-size: 0.8rem;
    padding: 5px 16px;
    height: auto;
    line-height: 1.5;
}

/* ===== 特徴セクション 3カラムグリッド（レスポンシブ） ===== */
.pf-features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-top: 40px;
}

@media (max-width: 768px) {
    .pf-features-grid {
        grid-template-columns: 1fr;
    }
}

@media (min-width: 769px) and (max-width: 1023px) {
    .pf-features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* 出力エリアの角丸を下部バーがある場合は除去 */
.cell-output-area:has(.cell-bottom-bar) {
    border-radius: 0;
}
.cell-output-area:has(.cell-bottom-bar) .cell-output {
    border-radius: 0;
}