/* 隱藏 number input 原生箭頭 */
#exam-count-display::-webkit-inner-spin-button,
#exam-count-display::-webkit-outer-spin-button { -webkit-appearance: none; margin: 0; }
#exam-count-display { -moz-appearance: textfield; }

/* ── Quiz Module ── */

#view-quiz {
    display: none;
    flex-direction: column;
    height: 100%;
}
#view-quiz.active { display: flex; }

.quiz-layout {
    display: flex;
    gap: 16px;
    flex: 1;
    overflow: hidden;
}

/* 左欄：題庫列表 */
.quiz-sidebar {
    width: 260px;
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    gap: 10px;
    overflow-y: auto;
}

#quiz-bank-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-top: 4px;
}

.quiz-bank-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 14px;
    padding: 14px 16px;
    cursor: pointer;
    transition: 0.2s;
    position: relative;
}
.quiz-bank-card:hover { background: var(--bg-hover); }
.quiz-bank-card.selected { border-color: var(--accent); box-shadow: 0 0 0 2px var(--accent-dim); }
.quiz-bank-card .bank-name { font-weight: 600; font-size: 0.95rem; margin-bottom: 4px; }
.quiz-bank-card .bank-meta { font-size: 0.78rem; color: var(--text-sub); }
.quiz-bank-card .bank-card-actions {
    position: absolute; top: 10px; right: 10px;
    display: flex; gap: 6px;
    opacity: 0;
    transition: 0.2s;
}
.quiz-bank-card:hover .bank-card-actions { opacity: 1; }
.quiz-bank-card .bank-edit,
.quiz-bank-card .bank-del {
    width: 24px; height: 24px;
    display: inline-flex; align-items: center; justify-content: center;
    border-radius: 7px;
    background: none; border: none; color: var(--text-sub);
    cursor: pointer; font-size: 0.78rem;
    transition: 0.15s;
}
.quiz-bank-card .bank-edit:hover { background: rgba(77,171,247,0.15); color: #4dabf7; }
.quiz-bank-card .bank-del:hover { background: var(--accent-dim); color: var(--accent); }

/* 右欄：題目內容 */
.quiz-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 12px;
    overflow: hidden;
}

.quiz-toolbar {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 0 16px;
    height: 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-shrink: 0;
    min-width: 0;
    overflow: hidden;
    box-sizing: border-box;
}
.quiz-toolbar-title {
    font-weight: 600;
    font-size: 1rem;
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    min-width: 0;
}
.quiz-toolbar-btns {
    display: flex;
    gap: 8px;
    flex-shrink: 0;
    align-items: center;
}
.quiz-toolbar-btns .btn-tool {
    white-space: nowrap;
    padding: 0 14px;
    width: auto;
}

.quiz-questions-list {
    flex: 1;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 10px;
    padding-bottom: 20px;
}

.quiz-q-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 14px;
    padding: 16px;
}
.quiz-q-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 10px;
    margin-bottom: 10px;
}
.quiz-q-content { font-size: 0.95rem; line-height: 1.5; flex: 1; }
.quiz-q-type-badge {
    font-size: 0.7rem;
    padding: 2px 8px;
    border-radius: 20px;
    background: var(--accent-dim);
    color: var(--accent);
    flex-shrink: 0;
    white-space: nowrap;
}
.quiz-q-options { display: flex; flex-direction: column; gap: 6px; }
.quiz-opt-row {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.85rem;
    padding: 6px 10px;
    border-radius: 8px;
    background: var(--input-bg);
}
.quiz-opt-row.correct { background: rgba(76, 175, 80, 0.15); color: #4caf50; }
.quiz-opt-dot {
    width: 16px; height: 16px;
    border-radius: 50%;
    border: 2px solid var(--border-color);
    flex-shrink: 0;
    display: flex; align-items: center; justify-content: center;
}
.quiz-opt-row.correct .quiz-opt-dot { border-color: #4caf50; background: #4caf50; }
.quiz-opt-dot-inner { width: 6px; height: 6px; border-radius: 50%; background: white; }
.quiz-q-tag-badge {
    font-size: 0.7rem;
    font-weight: 600;
    padding: 3px 10px 3px 8px;
    border-radius: 20px;
    background: rgba(139, 92, 246, 0.14);
    color: #a78bfa;
    border: 1px solid rgba(139, 92, 246, 0.3);
    flex-shrink: 0;
    white-space: nowrap;
    display: inline-flex;
    align-items: center;
    gap: 4px;
}
.quiz-q-tag-badge i { font-size: 0.6rem; opacity: 0.85; }
.quiz-q-edit,
.quiz-q-del {
    width: 26px; height: 26px;
    display: inline-flex; align-items: center; justify-content: center;
    border-radius: 7px;
    background: none; border: none; color: var(--text-sub);
    cursor: pointer; font-size: 0.8rem;
    transition: 0.15s;
    flex-shrink: 0;
}
.quiz-q-edit:hover { background: rgba(77,171,247,0.15); color: #4dabf7; }
.quiz-q-del:hover { background: var(--accent-dim); color: var(--accent); }

/* 空狀態 */
.quiz-empty {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--text-sub);
    gap: 10px;
    font-size: 0.9rem;
}
.quiz-empty i { font-size: 2.5rem; opacity: 0.4; }

/* ── 練習模式 ── */

.quiz-practice-overlay {
    position: fixed; inset: 0;
    background: var(--bg-color);
    z-index: 200;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    padding: 40px 20px;
    box-sizing: border-box;
    overflow-y: auto;
}
.quiz-practice-box {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 36px 40px;
    width: min(680px, calc(100vw - 40px));
    box-shadow: 0 8px 40px rgba(0,0,0,0.3);
    box-sizing: border-box;
    margin: auto;
}
.quiz-practice-progress {
    font-size: 0.8rem;
    color: var(--text-sub);
    margin-bottom: 8px;
}
.quiz-practice-progress-bar {
    height: 4px;
    background: var(--border-color);
    border-radius: 2px;
    margin-bottom: 28px;
    overflow: hidden;
}
.quiz-practice-progress-fill {
    height: 100%;
    background: var(--accent);
    border-radius: 2px;
    transition: width 0.3s;
}
.quiz-practice-q { font-size: 1.1rem; font-weight: 600; line-height: 1.6; margin-bottom: 24px; }
.quiz-practice-hint { font-size: 0.78rem; color: var(--text-sub); margin-bottom: 14px; }
.quiz-practice-options { display: flex; flex-direction: column; gap: 10px; }
.quiz-practice-opt {
    padding: 12px 16px;
    border-radius: 12px;
    border: 1.5px solid var(--border-color);
    background: var(--input-bg);
    color: var(--text-main);
    cursor: pointer;
    text-align: left;
    font-size: 0.9rem;
    transition: 0.15s;
    display: flex; align-items: center; gap: 10px;
}
.quiz-practice-opt:hover:not(:disabled) { border-color: var(--accent); background: var(--accent-dim); }
.quiz-practice-opt.selected { border-color: var(--accent); background: var(--accent-dim); }
.quiz-practice-opt.correct { border-color: #4caf50; background: rgba(76,175,80,0.15); color: #4caf50; }
.quiz-practice-opt.wrong { border-color: var(--accent); background: var(--accent-dim); color: var(--accent); }
.quiz-practice-opt:disabled { cursor: default; }

/* 單選圈圈 / 複選勾選框 */
.quiz-opt-marker {
    width: 18px; height: 18px;
    flex-shrink: 0;
    border: 2px solid var(--border-color);
    display: flex; align-items: center; justify-content: center;
    transition: 0.15s;
    font-size: 0.7rem;
    color: transparent;
    box-sizing: border-box;
}
.quiz-opt-marker.radio { border-radius: 50%; }
.quiz-opt-marker.checkbox { border-radius: 4px; }
.quiz-opt-marker-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); opacity: 0; transform: scale(0); transition: 0.15s; }

.quiz-practice-opt.selected .quiz-opt-marker { border-color: var(--accent); }
.quiz-practice-opt.selected .quiz-opt-marker.radio .quiz-opt-marker-dot { opacity: 1; transform: scale(1); }
.quiz-practice-opt.selected .quiz-opt-marker.checkbox { background: var(--accent); color: white; }

.quiz-practice-opt.correct .quiz-opt-marker { border-color: #4caf50; }
.quiz-practice-opt.correct .quiz-opt-marker.radio .quiz-opt-marker-dot { opacity: 1; transform: scale(1); background: #4caf50; }
.quiz-practice-opt.correct .quiz-opt-marker.checkbox { border-color: #4caf50; background: #4caf50; color: white; }

.quiz-practice-opt.wrong .quiz-opt-marker { border-color: var(--accent); }
.quiz-practice-opt.wrong .quiz-opt-marker.radio .quiz-opt-marker-dot { opacity: 1; transform: scale(1); background: var(--accent); }
.quiz-practice-opt.wrong .quiz-opt-marker.checkbox { border-color: var(--accent); background: var(--accent); color: white; }
.quiz-practice-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 28px;
    gap: 12px;
    flex-wrap: wrap;
}
.quiz-practice-actions .btn-tool {
    white-space: nowrap;
    flex-shrink: 0;
}
.quiz-practice-feedback { font-size: 0.88rem; font-weight: 600; }
.quiz-practice-feedback.ok { color: #4caf50; }
.quiz-practice-feedback.fail { color: var(--accent); }

/* 結果頁 */
.quiz-result-box {
    text-align: center;
    padding: 20px 0;
}
.quiz-result-score { font-size: 3rem; font-weight: 700; color: var(--accent); }
.quiz-result-label { font-size: 1rem; color: var(--text-sub); margin-top: 6px; }
.quiz-result-detail { margin-top: 20px; font-size: 0.88rem; color: var(--text-sub); }

/* ── 新增題目 Modal ── */

.quiz-opt-input-row { display: flex; gap: 8px; align-items: center; }
.quiz-opt-input-row input[type=text] {
    flex: 1;
    background: var(--input-bg);
    border: 1px solid var(--border-color);
    padding: 8px 12px;
    border-radius: 8px;
    color: var(--text-main);
    outline: none;
    font-size: 0.88rem;
}
.quiz-opt-correct-toggle {
    width: 28px; height: 28px;
    border-radius: 50%;
    border: 2px solid var(--border-color);
    background: none;
    cursor: pointer;
    display: flex; align-items: center; justify-content: center;
    color: var(--text-sub);
    transition: 0.15s;
    flex-shrink: 0;
}
.quiz-opt-correct-toggle.active { border-color: #4caf50; background: rgba(76,175,80,0.2); color: #4caf50; }
.quiz-opt-del-btn {
    background: none; border: none;
    color: var(--text-sub); cursor: pointer;
    font-size: 0.85rem; flex-shrink: 0;
    transition: 0.15s;
}
.quiz-opt-del-btn:hover { color: var(--accent); }

/* ── 測驗模式 ── */

.quiz-exam-overlay {
    position: fixed; inset: 0;
    background: var(--bg-color);
    z-index: 200;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    padding: 40px 20px;
    box-sizing: border-box;
    overflow-y: auto;
}
.quiz-exam-box {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 36px 40px;
    width: min(680px, calc(100vw - 40px));
    box-shadow: 0 8px 40px rgba(0,0,0,0.3);
    box-sizing: border-box;
    margin: auto;
}

/* 導覽點 */
.exam-nav-dots {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 24px;
}
.exam-nav-dot {
    width: 30px; height: 30px;
    border-radius: 8px;
    border: 1.5px solid var(--border-color);
    background: var(--input-bg);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-sub);
    cursor: pointer;
    transition: 0.15s;
    display: flex; align-items: center; justify-content: center;
}
.exam-nav-dot:hover { border-color: var(--accent); color: var(--accent); }
.exam-nav-dot.answered { background: var(--accent-dim); border-color: var(--accent); color: var(--accent); }
.exam-nav-dot.current { background: var(--accent); border-color: var(--accent); color: white; }

.exam-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 24px;
    gap: 12px;
    flex-wrap: wrap;
}
.exam-actions .btn-tool {
    white-space: nowrap;
    width: auto;
    height: 40px;
    padding: 0 20px;
    flex-shrink: 0;
}

/* 測驗結果 */
.exam-result-header {
    text-align: center;
    padding-bottom: 24px;
    margin-bottom: 24px;
    border-bottom: 1px solid var(--border-color);
}
.exam-result-score {
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1;
}
.exam-result-score.pass { color: #4caf50; }
.exam-result-score.fail { color: var(--accent); }
.exam-result-meta { font-size: 0.9rem; color: var(--text-sub); margin-top: 8px; }

/* 答題回顧 */
.exam-review-list { display: flex; flex-direction: column; gap: 14px; margin-top: 4px; }
.exam-review-item {
    border-radius: 12px;
    border: 1.5px solid var(--border-color);
    overflow: hidden;
}
.exam-review-item.correct { border-color: rgba(76,175,80,0.5); }
.exam-review-item.wrong { border-color: rgba(230,57,70,0.5); }
.exam-review-header {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 12px 16px;
    background: var(--input-bg);
}
.exam-review-badge {
    font-size: 0.72rem;
    padding: 2px 8px;
    border-radius: 20px;
    flex-shrink: 0;
    margin-top: 2px;
    font-weight: 600;
}
.exam-review-badge.correct { background: rgba(76,175,80,0.15); color: #4caf50; }
.exam-review-badge.wrong { background: var(--accent-dim); color: var(--accent); }
.exam-review-content { font-size: 0.9rem; line-height: 1.5; flex: 1; }
.exam-review-opts {
    padding: 10px 16px;
    display: flex;
    flex-direction: column;
    gap: 5px;
    background: var(--card-bg);
}
.exam-review-opt {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.82rem;
    padding: 5px 8px;
    border-radius: 6px;
    color: var(--text-sub);
}
.exam-review-opt.is-correct { color: #4caf50; background: rgba(76,175,80,0.1); }
.exam-review-opt.is-wrong-sel { color: var(--accent); background: var(--accent-dim); }
.exam-review-opt-icon { font-size: 0.7rem; width: 14px; flex-shrink: 0; }
.exam-review-answer-line {
    padding: 8px 16px 12px;
    font-size: 0.8rem;
    color: #4caf50;
    background: var(--card-bg);
    border-top: 1px dashed var(--border-color);
}
.exam-review-answer-line b { font-weight: 700; }

/* ── 歷史紀錄 Overlay ── */

.quiz-history-overlay {
    position: fixed; inset: 0;
    background: var(--bg-color);
    z-index: 200;
    display: flex;
    flex-direction: column;
    padding: 0;
    box-sizing: border-box;
}
.quiz-history-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 20px 28px;
    border-bottom: 1px solid var(--border-color);
    background: var(--card-bg);
    flex-shrink: 0;
}
.quiz-history-header h2 { margin: 0; font-size: 1.1rem; flex: 1; }

.quiz-history-body {
    flex: 1;
    overflow-y: auto;
    padding: 20px 28px;
    display: flex;
    gap: 20px;
}

/* 左：紀錄列表 */
.history-list-col {
    width: 300px;
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    gap: 10px;
    overflow-y: auto;
}
.history-session-card {
    background: var(--card-bg);
    border: 1.5px solid var(--border-color);
    border-radius: 14px;
    padding: 14px 16px;
    cursor: pointer;
    transition: 0.2s;
}
.history-session-card:hover { background: var(--bg-hover); }
.history-session-card.selected { border-color: var(--accent); box-shadow: 0 0 0 2px var(--accent-dim); }
.history-session-bank { font-weight: 600; font-size: 0.9rem; margin-bottom: 6px; }
.history-session-meta { display: flex; gap: 10px; align-items: center; font-size: 0.78rem; color: var(--text-sub); }
.history-score-badge {
    font-size: 0.85rem;
    font-weight: 700;
    padding: 2px 10px;
    border-radius: 20px;
}
.history-score-badge.pass { background: rgba(76,175,80,0.15); color: #4caf50; }
.history-score-badge.fail { background: var(--accent-dim); color: var(--accent); }

/* 右：詳細回顧 */
.history-detail-col {
    flex: 1;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 14px;
}
.history-detail-empty {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--text-sub);
    gap: 10px;
    font-size: 0.9rem;
}
.history-detail-summary {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 14px;
    padding: 20px 24px;
    display: flex;
    gap: 24px;
    align-items: center;
    flex-shrink: 0;
}
.history-summary-score {
    font-size: 2.5rem;
    font-weight: 700;
    line-height: 1;
}
.history-summary-score.pass { color: #4caf50; }
.history-summary-score.fail { color: var(--accent); }
.history-summary-info { font-size: 0.85rem; color: var(--text-sub); line-height: 1.8; }
.history-filter-tabs {
    display: flex;
    gap: 8px;
    flex-shrink: 0;
}
.history-tab-btn {
    padding: 6px 16px;
    border-radius: 20px;
    border: 1.5px solid var(--border-color);
    background: var(--input-bg);
    color: var(--text-sub);
    font-size: 0.82rem;
    cursor: pointer;
    transition: 0.15s;
    white-space: nowrap;
}
.history-tab-btn.active { border-color: var(--accent); background: var(--accent-dim); color: var(--accent); }

/* ── 標籤輸入框（新增/編輯題目）── */
.tag-input-wrap { position: relative; }
.tag-input-wrap i {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-sub);
    font-size: 0.78rem;
    pointer-events: none;
}
.tag-input-wrap input {
    width: 100%;
    background: var(--input-bg);
    border: 1px solid var(--border-color);
    padding: 10px 12px 10px 34px;
    border-radius: 8px;
    color: var(--text-main);
    outline: none;
    font-size: 0.85rem;
    box-sizing: border-box;
    transition: 0.15s;
}
.tag-input-wrap input:focus { border-color: var(--accent); }

/* ── 標籤篩選 Chip（練習/測驗設定共用）── */
.tag-filter-btn {
    padding: 6px 14px 6px 12px;
    border-radius: 999px;
    font-size: 0.78rem;
    font-weight: 600;
    cursor: pointer;
    border: 1.5px solid var(--border-color);
    background: var(--input-bg);
    color: var(--text-sub);
    transition: 0.15s;
    display: inline-flex;
    align-items: center;
    gap: 5px;
}
.tag-filter-btn:hover { border-color: var(--accent); color: var(--accent); }
.tag-filter-btn.active {
    border-color: var(--accent);
    background: var(--accent-dim);
    color: var(--accent);
}
.tag-filter-btn .tag-check {
    font-size: 0.65rem;
    width: 0;
    opacity: 0;
    transform: scale(0.4);
    transition: 0.15s;
    overflow: hidden;
}
.tag-filter-btn.active .tag-check { width: auto; opacity: 1; transform: scale(1); }

/* ── 錯題複習 CTA ── */
.btn-warn {
    background: #f5a524 !important;
    color: #241a00 !important;
    font-weight: 700;
    box-shadow: 0 4px 14px rgba(245, 165, 36, 0.35);
}
.btn-warn:hover { background: #ffb238 !important; }