/* 学習体験向上のための追加スタイル */

/* 問題ナビゲーションバー */
.question-navigation {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-lg);
    padding: 1rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow-md);
}

.nav-title {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
}

.nav-items {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.nav-item {
    width: 36px;
    height: 36px;
    border: 2px solid #e2e8f0;
    border-radius: var(--radius-md);
    background: white;
    color: var(--text-primary);
    font-size: 0.875rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
}

.nav-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--category-color, var(--primary-color));
    border-radius: var(--radius-md) var(--radius-md) 0 0;
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.nav-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--category-color, var(--primary-color));
}

.nav-item:hover::before {
    opacity: 1;
}

.nav-item.current {
    background: var(--category-color, var(--primary-color));
    color: white;
    border-color: var(--category-color, var(--primary-color));
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.2);
}

.nav-item.answered-correct {
    background: #d1fae5;
    border-color: var(--success-color);
    color: #065f46;
}

.nav-item.answered-correct::after {
    content: '✓';
    position: absolute;
    top: -6px;
    right: -6px;
    width: 16px;
    height: 16px;
    background: var(--success-color);
    color: white;
    border-radius: 50%;
    font-size: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.nav-item.answered-incorrect {
    background: #fee2e2;
    border-color: var(--error-color);
    color: #991b1b;
}

.nav-item.answered-incorrect::after {
    content: '✗';
    position: absolute;
    top: -6px;
    right: -6px;
    width: 16px;
    height: 16px;
    background: var(--error-color);
    color: white;
    border-radius: 50%;
    font-size: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.nav-item.skipped {
    background: #fef3c7;
    border-color: var(--warning-color);
    color: #92400e;
}

.nav-item.skipped::after {
    content: '⏩';
    position: absolute;
    top: -6px;
    right: -6px;
    font-size: 10px;
}

/* カテゴリ別正解率 */
.category-breakdown {
    margin-top: 2rem;
    padding: 1.5rem;
    background: linear-gradient(135deg, #f8fafc, #f1f5f9);
    border-radius: var(--radius-lg);
    border: 1px solid #e2e8f0;
}

.breakdown-title {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

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

.breakdown-item {
    background: white;
    padding: 1rem;
    border-radius: var(--radius-md);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    transition: all var(--transition-normal);
}

.breakdown-item:hover {
    transform: translateX(4px);
    box-shadow: var(--shadow-md);
}

.breakdown-category {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
}

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

.category-name-text {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
}

.breakdown-stats {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.breakdown-accuracy {
    font-size: 1.25rem;
    font-weight: 700;
}

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

.breakdown-bar {
    width: 100%;
    height: 8px;
    background: #e2e8f0;
    border-radius: 4px;
    overflow: hidden;
}

.breakdown-fill {
    height: 100%;
    border-radius: 4px;
    transition: width 1s ease-out;
}

/* 学習統計 */
.learning-stats {
    margin-top: 2rem;
    padding: 1.5rem;
    background: linear-gradient(135deg, #f0f9ff, #e0f2fe);
    border-radius: var(--radius-lg);
    border: 1px solid #bae6fd;
}

.stats-title {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 1rem;
}

.stat-box {
    background: white;
    padding: 1rem;
    border-radius: var(--radius-md);
    text-align: center;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    transition: all var(--transition-normal);
}

.stat-box:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.stat-label {
    display: block;
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.stat-value {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

/* カテゴリ色分け強調 */
.question-card {
    position: relative;
    overflow: hidden;
}

.question-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--category-color, var(--primary-color));
}

/* レスポンシブ対応 */
@media (max-width: 768px) {
    .nav-items {
        gap: 0.375rem;
    }
    
    .nav-item {
        width: 32px;
        height: 32px;
        font-size: 0.75rem;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .category-breakdown,
    .learning-stats {
        padding: 1rem;
    }
}

@media (max-width: 480px) {
    .question-navigation {
        padding: 0.75rem;
    }
    
    .nav-item {
        width: 28px;
        height: 28px;
        font-size: 0.7rem;
    }
    
    .breakdown-list {
        gap: 0.75rem;
    }
    
    .breakdown-item {
        padding: 0.75rem;
    }
}

/* フラッシュカードモードのスタイル */
.flashcard-mode {
    perspective: 1000px;
    min-height: 400px;
}

.flashcard {
    position: relative;
    width: 100%;
    height: 100%;
    min-height: 400px;
    transition: transform 0.6s;
    transform-style: preserve-3d;
}

.flashcard.flipped {
    transform: rotateY(180deg);
}

.flashcard-front,
.flashcard-back {
    position: absolute;
    width: 100%;
    min-height: 400px;
    backface-visibility: hidden;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    border-radius: var(--radius-lg);
    background: white;
}

[data-theme="dark"] .flashcard-front,
[data-theme="dark"] .flashcard-back {
    background: var(--card-bg);
}

.flashcard-back {
    transform: rotateY(180deg);
}

.flashcard-label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.flashcard-content {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    text-align: center;
    margin-bottom: 2rem;
    line-height: 1.6;
}

.flashcard-answer {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-color);
    text-align: center;
    margin-bottom: 1rem;
}

.flashcard-explanation {
    font-size: 0.95rem;
    color: var(--text-secondary);
    text-align: center;
    margin-bottom: 2rem;
    line-height: 1.6;
}

.flip-btn {
    background: var(--gradient-primary);
    color: white;
    border: none;
    padding: 0.875rem 2rem;
    border-radius: var(--radius-lg);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.flip-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.flashcard-actions {
    display: flex;
    gap: 1rem;
    width: 100%;
    max-width: 500px;
}

.confidence-btn {
    flex: 1;
    padding: 1rem;
    border: 2px solid #e2e8f0;
    border-radius: var(--radius-lg);
    background: white;
    cursor: pointer;
    transition: all var(--transition-normal);
    font-size: 0.95rem;
    font-weight: 600;
}

[data-theme="dark"] .confidence-btn {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.1);
}

.confidence-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.confidence-btn[data-level="hard"] {
    border-color: #ef4444;
    color: #ef4444;
}

.confidence-btn[data-level="hard"]:hover {
    background: #fef2f2;
    border-color: #dc2626;
}

[data-theme="dark"] .confidence-btn[data-level="hard"]:hover {
    background: rgba(239, 68, 68, 0.1);
}

.confidence-btn[data-level="good"] {
    border-color: #f59e0b;
    color: #f59e0b;
}

.confidence-btn[data-level="good"]:hover {
    background: #fffbeb;
    border-color: #d97706;
}

[data-theme="dark"] .confidence-btn[data-level="good"]:hover {
    background: rgba(245, 158, 11, 0.1);
}

.confidence-btn[data-level="easy"] {
    border-color: #10b981;
    color: #10b981;
}

.confidence-btn[data-level="easy"]:hover {
    background: #ecfdf5;
    border-color: #059669;
}

[data-theme="dark"] .confidence-btn[data-level="easy"]:hover {
    background: rgba(16, 185, 129, 0.1);
}

/* ノートセクションのスタイル */
.note-section {
    margin-top: 1.5rem;
    padding: 1.5rem;
    background: #f8fafc;
    border-radius: var(--radius-lg);
    border: 2px solid #e2e8f0;
}

[data-theme="dark"] .note-section {
    background: rgba(255, 255, 255, 0.03);
    border-color: rgba(255, 255, 255, 0.1);
}

.note-section h3 {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0 0 0.75rem 0;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.note-section textarea {
    width: 100%;
    min-height: 100px;
    padding: 0.75rem;
    border: 1px solid #e2e8f0;
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 0.9rem;
    resize: vertical;
    transition: all var(--transition-normal);
}

[data-theme="dark"] .note-section textarea {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
}

.note-section textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.note-save-btn {
    margin-top: 0.75rem;
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 0.625rem 1.25rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 0.875rem;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.note-save-btn:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
}

/* 問題アクションボタン */
.question-actions {
    display: flex;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
    justify-content: center;
}

.action-btn {
    background: white;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 0.75rem 1rem;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    font-size: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 48px;
    min-height: 48px;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.06);
    position: relative;
    overflow: hidden;
}

.action-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--primary-color);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.action-btn:hover {
    border-color: var(--primary-color);
    transform: translateY(-2px) scale(1.05);
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.15);
}

.action-btn:hover::before {
    transform: scaleX(1);
}

.action-btn:active {
    transform: translateY(0) scale(1);
}

.action-btn.active {
    background: linear-gradient(135deg, rgba(79, 70, 229, 0.1), rgba(16, 185, 129, 0.08));
    border-color: var(--primary-color);
}

#bookmark-btn.active {
    background: linear-gradient(135deg, rgba(239, 68, 68, 0.1), rgba(220, 38, 38, 0.08));
    border-color: var(--error-color);
}

#bookmark-btn.active::before {
    background: var(--error-color);
}

@media (max-width: 768px) {
    .flashcard-content {
        font-size: 1.25rem;
    }
    
    .flashcard-answer {
        font-size: 1.1rem;
    }
    
    .flashcard-actions {
        flex-direction: column;
    }
    
    .confidence-btn {
        padding: 0.875rem;
    }
    
    .action-btn {
        padding: 0.625rem 0.875rem;
        min-width: 44px;
        min-height: 44px;
        font-size: 1.25rem;
    }
}

/* ==========================================
   2026 \u5171\u901a\u30c6\u30b9\u30c8\u5bfe\u7b56 \u30b9\u30bf\u30a4\u30eb
   ========================================== */

/* \u5171\u901a\u30c6\u30b9\u30c8\u30d0\u30ca\u30fc */
.kyotsu-banner {
    margin: 1.5rem 0 0.5rem;
    padding: 0;
    border-radius: var(--radius-lg, 12px);
    background: linear-gradient(135deg, #f0fdf4, #dcfce7);
    border: 2px solid #16a34a;
    overflow: hidden;
    animation: kyotsuSlideIn 0.5s ease;
}

[data-theme="dark"] .kyotsu-banner {
    background: linear-gradient(135deg, rgba(22, 163, 74, 0.12), rgba(20, 83, 45, 0.2));
    border-color: #16a34a;
}

.kyotsu-banner-inner {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.75rem 1.25rem;
    flex-wrap: wrap;
}

.kyotsu-badge {
    background: #16a34a;
    color: white;
    font-size: 0.68rem;
    font-weight: 800;
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    letter-spacing: 0.08em;
    white-space: nowrap;
    flex-shrink: 0;
}

.kyotsu-banner-text {
    flex: 1;
    font-size: 0.88rem;
    color: #15803d;
    line-height: 1.4;
}

[data-theme="dark"] .kyotsu-banner-text {
    color: #4ade80;
}

.kyotsu-banner-text strong {
    font-size: 0.93rem;
}

.kyotsu-banner-text small {
    opacity: 0.85;
}

.kyotsu-start-btn {
    background: #16a34a;
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    font-size: 0.85rem;
    font-weight: 700;
    cursor: pointer;
    transition: background 0.2s, transform 0.1s;
    white-space: nowrap;
    flex-shrink: 0;
}

.kyotsu-start-btn:hover {
    background: #15803d;
    transform: translateY(-1px);
}

/* \u5171\u901a\u30c6\u30b9\u30c8\u5bfe\u7b56 \u30af\u30a4\u30c3\u30af\u30a2\u30af\u30b7\u30e7\u30f3\u30dc\u30bf\u30f3 */
.quick-btn-kyotsu {
    border-color: rgba(22, 163, 74, 0.35);
    background: rgba(22, 163, 74, 0.08);
}

.quick-btn-kyotsu:hover {
    background: rgba(22, 163, 74, 0.22);
    border-color: rgba(22, 163, 74, 0.65);
}

/* \u5171\u901a\u30c6\u30b9\u30c8\u5bfe\u7b56 \u30e2\u30fc\u30c9\u30ab\u30fc\u30c9 */
.mode-card-kyotsu {
    position: relative;
}

.mode-card-kyotsu::after {
    content: "2026";
    position: absolute;
    top: -8px;
    right: 6px;
    background: #16a34a;
    color: white;
    font-size: 0.6rem;
    font-weight: 800;
    padding: 0.15rem 0.4rem;
    border-radius: 4px;
    letter-spacing: 0.05em;
}

/* \u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3 */
@keyframes kyotsuSlideIn {
    from { opacity: 0; transform: translateY(-10px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* \u30ec\u30b9\u30dd\u30f3\u30b7\u30d6\u5bfe\u5fdc */
@media (max-width: 600px) {
    .kyotsu-banner-inner {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }
    .kyotsu-start-btn {
        width: 100%;
        text-align: center;
    }
}

/* ===== 問題文・コードブロック表示 ===== */
.q-text {
    display: block;
    margin-bottom: 0.25rem;
}

/* 複数行コードブロック（疑似言語・アルゴリズム） */
.question-title pre.q-code {
    margin: 1rem 0 0;
    padding: 1rem 1.25rem;
    background: #f8f9ff;
    border: 1.5px solid #c7d2fe;
    border-left: 4px solid var(--primary-color, #4f46e5);
    border-radius: 8px;
    overflow-x: auto;
    font-size: 0.88rem;
    line-height: 1.75;
    text-align: left;
    white-space: pre;
}

.question-title pre.q-code code {
    font-family: 'SFMono-Regular', 'Consolas', 'Liberation Mono', 'Menlo', monospace;
    color: #1e293b;
    background: none;
    padding: 0;
    font-size: inherit;
}

/* ダークモード対応 */
[data-theme="dark"] .question-title pre.q-code,
.dark-mode .question-title pre.q-code {
    background: #0f0f1a;
    border-color: #374151;
    border-left-color: #818cf8;
}

[data-theme="dark"] .question-title pre.q-code code,
.dark-mode .question-title pre.q-code code {
    color: #e2e8f0;
}

/* スクロールバー（Webkit） */
.question-title pre.q-code::-webkit-scrollbar {
    height: 5px;
}
.question-title pre.q-code::-webkit-scrollbar-thumb {
    background: var(--primary-color, #4f46e5);
    border-radius: 4px;
}

/* モバイル対応 */
@media (max-width: 600px) {
    .question-title pre.q-code {
        font-size: 0.78rem;
        padding: 0.75rem 0.9rem;
    }
}

/* ===== コード選択肢スタイル ===== */
.option.option-code {
    align-items: flex-start;
}

.option-code-text {
    font-family: 'SFMono-Regular', 'Consolas', 'Liberation Mono', 'Menlo', monospace;
    font-size: 0.87rem;
    line-height: 1.65;
    color: #1e293b;
    background: #f8f9ff;
    border: 1px solid #c7d2fe;
    border-radius: 5px;
    padding: 0.35em 0.6em;
    display: inline-block;
    white-space: pre-wrap;
    word-break: break-all;
}

[data-theme="dark"] .option-code-text,
.dark-mode .option-code-text {
    color: #e2e8f0;
    background: #0f0f1a;
    border-color: #374151;
}

@media (max-width: 600px) {
    .option-code-text {
        font-size: 0.78rem;
    }
}