/* PDF2QUIZ 樣式表 */

/* 變數 */
:root {
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --success: #16a34a;
    --success-bg: #f0fdf4;
    --error: #dc2626;
    --error-bg: #fef2f2;
    --warning: #d97706;
    --bg: #f1f5f9;
    --bg-card: #ffffff;
    --text: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --border: #e2e8f0;
    --border-hover: #cbd5e1;
    --header-bg: #1e293b;
    --header-text: #f1f5f9;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
    --radius: 8px;
    --radius-lg: 12px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: "Noto Sans TC", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
}

/* Lucide Icons 基本樣式 */
[data-lucide] {
    width: 18px;
    height: 18px;
    stroke-width: 2;
    flex-shrink: 0;
}

/* 整體布局 */
.app {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* 頂部導航 */
.sidebar {
    background: var(--header-bg);
    color: var(--header-text);
    padding: 0 20px;
    height: 56px;
    display: flex;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow);
}

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

.sidebar-header .header-icon {
    width: 22px;
    height: 22px;
}

.sidebar-header h1 {
    font-size: 1.125rem;
    font-weight: 600;
    letter-spacing: -0.025em;
}

.sidebar-nav {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-left: 32px;
}

.nav-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    background: transparent;
    border: none;
    color: var(--header-text);
    padding: 8px 16px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 500;
    transition: background 0.15s;
    opacity: 0.8;
}

.nav-btn [data-lucide] {
    width: 16px;
    height: 16px;
}

.nav-btn:hover:not(:disabled) {
    background: rgba(255,255,255,0.1);
    opacity: 1;
}

.nav-btn.active {
    background: var(--primary);
    opacity: 1;
}

.nav-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.sidebar-footer {
    margin-left: auto;
    display: flex;
    align-items: center;
}

.quiz-bank-info {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.8rem;
}

.quiz-bank-info [data-lucide] {
    width: 14px;
    height: 14px;
    opacity: 0.7;
}

.quiz-bank-info .value {
    font-weight: 500;
    max-width: 200px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* 主內容區 */
.main-content {
    flex: 1;
    width: 100%;
    max-width: 800px;
    margin: 0 auto;
    padding: 24px 20px;
}

.screen {
    display: block;
}

.screen.hidden {
    display: none;
}

.screen-header {
    margin-bottom: 24px;
}

.screen-header h2 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text);
}

/* 題庫選擇 */
.bank-selector {
    margin-bottom: 24px;
}

.bank-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 20px;
}

.bank-item {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 16px 20px;
    background: var(--bg-card);
    border: 2px solid var(--border);
    border-radius: var(--radius);
    cursor: pointer;
    transition: border-color 0.15s, box-shadow 0.15s;
}

.bank-item [data-lucide] {
    width: 22px;
    height: 22px;
    color: var(--text-secondary);
    flex-shrink: 0;
}

.bank-item:hover {
    border-color: var(--primary);
}

.bank-item:hover [data-lucide] {
    color: var(--primary);
}

.bank-item.selected {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.bank-item.selected [data-lucide] {
    color: var(--primary);
}

.bank-item .bank-name {
    flex: 1;
    font-weight: 500;
    color: var(--text);
}

.bank-item .bank-count {
    color: var(--text-secondary);
    font-size: 0.875rem;
    background: var(--bg);
    padding: 4px 10px;
    border-radius: 20px;
}

.bank-item .bank-badge {
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--primary);
    background: rgba(37, 99, 235, 0.1);
    padding: 2px 8px;
    border-radius: 4px;
    text-transform: uppercase;
    letter-spacing: 0.025em;
}

.bank-item .bank-delete {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: transparent;
    border: 1px solid transparent;
    border-radius: 6px;
    cursor: pointer;
    color: var(--text-muted);
    transition: all 0.15s;
    margin-left: 8px;
}

.bank-item .bank-delete [data-lucide] {
    width: 16px;
    height: 16px;
}

.bank-item .bank-delete:hover {
    background: var(--error-bg);
    border-color: var(--error);
    color: var(--error);
}

/* ========== 工具列（上傳 + 搜尋 + 格式說明） ========== */
.toolbar-section {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-top: 16px;
}

.upload-btn-compact {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    background: var(--bg-card);
    border: 1px dashed var(--border);
    border-radius: var(--radius);
    cursor: pointer;
    font-size: 0.85rem;
    color: var(--text-secondary);
    transition: border-color 0.15s, color 0.15s;
    white-space: nowrap;
}

.upload-btn-compact [data-lucide] {
    width: 16px;
    height: 16px;
}

.upload-btn-compact:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.search-box-compact {
    display: flex;
    align-items: center;
    gap: 8px;
    flex: 1;
    padding: 8px 12px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    transition: border-color 0.15s;
}

.search-box-compact:focus-within {
    border-color: var(--primary);
}

.search-box-compact [data-lucide] {
    width: 16px;
    height: 16px;
    color: var(--text-muted);
    flex-shrink: 0;
}

.search-box-compact input {
    flex: 1;
    min-width: 60px;
    border: none;
    background: transparent;
    font-size: 0.85rem;
    color: var(--text);
    outline: none;
}

.search-box-compact input::placeholder {
    color: var(--text-muted);
}

.search-box-compact input[type="number"]::-webkit-inner-spin-button,
.search-box-compact input[type="number"]::-webkit-outer-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.search-box-compact input[type="number"] {
    -moz-appearance: textfield;
}

.btn-search-compact {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    background: var(--primary);
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: background 0.15s;
}

.btn-search-compact [data-lucide] {
    width: 14px;
    height: 14px;
    color: white;
}

.btn-search-compact:hover {
    background: var(--primary-hover);
}

.format-help-btn-compact {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    cursor: pointer;
    color: var(--text-secondary);
    transition: all 0.15s;
}

.format-help-btn-compact [data-lucide] {
    width: 18px;
    height: 18px;
}

.format-help-btn-compact:hover {
    border-color: var(--primary);
    color: var(--primary);
}

/* 測驗設定 */
.quiz-setup {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 20px;
    box-shadow: var(--shadow);
}

.quiz-setup.hidden {
    display: none;
}

/* 標題和統計合併行 */
.setup-header-row {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 16px;
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border);
}

.setup-header {
    flex: 1;
}

.setup-header h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 2px;
}

.setup-header p {
    color: var(--text-secondary);
    font-size: 0.8rem;
}

/* 緊湊練習統計 */
.practice-stats-compact {
    display: flex;
    gap: 8px;
}

.practice-stats-compact.hidden {
    display: none;
}

.stat-badge {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 4px 10px;
    background: var(--bg);
    border-radius: 4px;
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.stat-badge [data-lucide] {
    width: 14px;
    height: 14px;
}

.stat-badge:not(.wrong) [data-lucide] {
    color: var(--success);
}

.stat-badge.wrong [data-lucide] {
    color: var(--error);
}

.stat-badge strong {
    color: var(--text);
    font-weight: 600;
}

/* 錯題練習區 */
.wrong-practice-section {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 16px;
}

.wrong-practice-section.hidden {
    display: none;
}

/* ========== 章節選擇器 ========== */
.topic-selector-section {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
    flex-wrap: wrap;
}

.topic-selector-section.hidden {
    display: none;
}

.topic-label {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
    white-space: nowrap;
}

.topic-dropdown {
    position: relative;
    flex: 1;
    min-width: 180px;
    max-width: 320px;
}

.topic-dropdown-btn {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    width: 100%;
    padding: 10px 14px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 0.85rem;
    color: var(--text);
    cursor: pointer;
    transition: all 0.15s;
}

.topic-dropdown-btn:hover {
    border-color: var(--primary);
}

.topic-dropdown-btn [data-lucide] {
    width: 16px;
    height: 16px;
    color: var(--text-muted);
    transition: transform 0.2s;
}

.topic-dropdown.open .topic-dropdown-btn {
    border-color: var(--primary);
}

.topic-dropdown.open .topic-dropdown-btn [data-lucide] {
    transform: rotate(180deg);
}

.topic-dropdown-menu {
    position: absolute;
    top: calc(100% + 4px);
    left: 0;
    right: 0;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow-md);
    max-height: 280px;
    overflow-y: auto;
    z-index: 50;
}

.topic-dropdown-menu.hidden {
    display: none;
}

.topic-option {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    cursor: pointer;
    transition: background 0.1s;
    font-size: 0.85rem;
    border-bottom: 1px solid var(--border);
}

.topic-option:last-child {
    border-bottom: none;
}

.topic-option:hover {
    background: var(--bg);
}

.topic-option.selected {
    background: rgba(37, 99, 235, 0.08);
}

.topic-option-checkbox {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 18px;
    height: 18px;
    border: 2px solid var(--border);
    border-radius: 4px;
    background: var(--bg-card);
    transition: all 0.15s;
    flex-shrink: 0;
}

.topic-option.selected .topic-option-checkbox {
    background: var(--primary);
    border-color: var(--primary);
}

.topic-option.selected .topic-option-checkbox::after {
    content: '';
    width: 10px;
    height: 10px;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='20 6 9 17 4 12'%3E%3C/polyline%3E%3C/svg%3E");
    background-size: contain;
    background-repeat: no-repeat;
}

.topic-option-label {
    flex: 1;
    color: var(--text);
}

.topic-option-count {
    font-size: 0.75rem;
    color: var(--text-muted);
    background: var(--bg);
    padding: 2px 8px;
    border-radius: 10px;
}

.topic-option.selected .topic-option-count {
    background: rgba(37, 99, 235, 0.15);
    color: var(--primary);
}

/* 全選選項特殊樣式 */
.topic-option.select-all {
    border-bottom: 2px solid var(--border);
    font-weight: 500;
}

.topic-question-count {
    font-size: 0.8rem;
    color: var(--text-secondary);
    white-space: nowrap;
}

/* 題數選擇和選項設定合併行 */
.quiz-options-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 16px;
    flex-wrap: wrap;
}

/* 緊湊模式選擇器 */
.mode-selector-compact {
    display: flex;
    align-items: center;
    gap: 6px;
}

.mode-chip {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 8px 14px;
    background: var(--bg);
    border: 1px solid transparent;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 500;
    transition: all 0.15s;
    white-space: nowrap;
}

.mode-chip:hover {
    border-color: var(--border-hover);
}

.mode-chip:has(input:checked) {
    border-color: var(--primary);
    background: rgba(37, 99, 235, 0.08);
    color: var(--primary);
}

.mode-chip input[type="radio"] {
    display: none;
}

.mode-chip.has-input {
    padding: 4px 10px;
}

.custom-input-compact {
    width: 48px;
    padding: 4px 6px;
    border: 1px solid var(--border);
    border-radius: 4px;
    font-size: 0.85rem;
    text-align: center;
}

.custom-input-compact:focus {
    outline: none;
    border-color: var(--primary);
}

.custom-input-compact:disabled {
    opacity: 0.4;
    background: transparent;
}

/* 緊湊選項切換 */
.option-toggles-compact {
    display: flex;
    align-items: center;
    gap: 6px;
}

.toggle-chip {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 8px 12px;
    background: var(--bg);
    border: 1px solid transparent;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.8rem;
    transition: all 0.15s;
    user-select: none;
}

.toggle-chip:hover {
    border-color: var(--border-hover);
}

.toggle-chip:has(input:checked) {
    border-color: var(--success);
    background: rgba(22, 163, 74, 0.08);
    color: var(--success);
}

.toggle-chip input {
    display: none;
}

.btn-start {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    width: 100%;
    padding: 16px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: var(--radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.15s;
}

.btn-start [data-lucide] {
    width: 20px;
    height: 20px;
}

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

.btn-start:active {
    transform: translateY(1px);
}

/* 測驗畫面 */
.quiz-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    margin-bottom: 20px;
    padding: 16px 20px;
    background: var(--bg-card);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
}

.progress-info {
    flex: 1;
}

.progress-info span {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.progress-bar {
    height: 8px;
    background: var(--border);
    border-radius: 4px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: var(--primary);
    border-radius: 4px;
    transition: width 0.3s ease;
    width: 0%;
}

.btn-end {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 10px 16px;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.15s;
    white-space: nowrap;
}

.btn-end [data-lucide] {
    width: 16px;
    height: 16px;
}

.btn-end:hover {
    border-color: var(--error);
    color: var(--error);
}

/* 題目區 */
.question-container {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 24px;
    margin-bottom: 20px;
    box-shadow: var(--shadow);
}

.q-type {
    display: inline-block;
    padding: 4px 12px;
    background: var(--warning);
    color: white;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.025em;
}

.q-type.hidden {
    display: none;
}

.question-text {
    margin-bottom: 24px;
}

/* 選項 */
.options-container {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.option {
    display: flex;
    align-items: flex-start;
    padding: 16px;
    border: 2px solid var(--border);
    border-radius: var(--radius);
    cursor: pointer;
    transition: all 0.15s;
    background: var(--bg-card);
}

.option:hover:not(.disabled) {
    border-color: var(--primary);
    background: rgba(37, 99, 235, 0.02);
}

.option.selected {
    border-color: var(--primary);
    background: rgba(37, 99, 235, 0.05);
}

.option.correct {
    border-color: var(--success);
    background: var(--success-bg);
}

.option.incorrect {
    border-color: var(--error);
    background: var(--error-bg);
}

.option.disabled {
    cursor: default;
}

.option-letter {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    min-width: 32px;
    background: var(--bg);
    border: 2px solid var(--border);
    border-radius: 50%;
    font-weight: 600;
    font-size: 0.875rem;
    margin-right: 14px;
    transition: all 0.15s;
}

.option.selected .option-letter {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
}

.option.correct .option-letter {
    background: var(--success);
    border-color: var(--success);
    color: white;
}

.option.incorrect .option-letter {
    background: var(--error);
    border-color: var(--error);
    color: white;
}

.option-text {
    flex: 1;
    line-height: 1.6;
    padding-top: 4px;
}

/* 回饋 */
.feedback {
    display: flex;
    align-items: flex-start;
    gap: 14px;
    padding: 18px;
    border-radius: var(--radius);
    margin-top: 24px;
}

.feedback.hidden {
    display: none;
}

.feedback.correct {
    background: var(--success-bg);
    border: 1px solid var(--success);
}

.feedback.incorrect {
    background: var(--error-bg);
    border: 1px solid var(--error);
}

.feedback-icon {
    width: 28px;
    height: 28px;
    min-width: 28px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 0.875rem;
    color: white;
}

.feedback.correct .feedback-icon {
    background: var(--success);
}

.feedback.correct .feedback-icon::before {
    content: "O";
}

.feedback.incorrect .feedback-icon {
    background: var(--error);
}

.feedback.incorrect .feedback-icon::before {
    content: "X";
}

.feedback-content {
    flex: 1;
}

.feedback-message {
    font-weight: 600;
    font-size: 1rem;
    margin-bottom: 4px;
}

.feedback.correct .feedback-message {
    color: var(--success);
}

.feedback.incorrect .feedback-message {
    color: var(--error);
}

.correct-answer {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.explanation {
    margin-top: 20px;
    padding: 18px;
    background: var(--bg);
    border-radius: var(--radius);
    font-size: 0.9rem;
    line-height: 1.7;
    color: var(--text-secondary);
    border-left: 3px solid var(--primary);
}

.explanation.hidden {
    display: none;
}

/* 測驗底部 */
.quiz-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    padding: 16px 20px;
    background: var(--bg-card);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
}

.btn-nav {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 12px 24px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.15s;
}

.btn-nav [data-lucide] {
    width: 18px;
    height: 18px;
}

.btn-nav:hover:not(:disabled) {
    border-color: var(--primary);
    color: var(--primary);
}

.btn-nav:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.btn-nav.hidden {
    visibility: hidden;
}

.btn-submit {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 40px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.15s;
}

.btn-submit [data-lucide] {
    width: 20px;
    height: 20px;
}

.btn-submit:hover:not(:disabled) {
    background: var(--primary-hover);
}

.btn-submit:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-submit.hidden {
    display: none;
}

/* 結果畫面 */
.result-container {
    max-width: 480px;
    margin: 0 auto;
    text-align: center;
    padding: 20px;
}

.result-container h2 {
    font-size: 1.5rem;
    margin-bottom: 32px;
    color: var(--text);
}

.score-display {
    margin-bottom: 40px;
}

.score-ring {
    position: relative;
    width: 180px;
    height: 180px;
    margin: 0 auto;
}

.score-ring svg {
    width: 100%;
    height: 100%;
    transform: rotate(-90deg);
}

.ring-bg {
    fill: none;
    stroke: var(--border);
    stroke-width: 10;
}

.ring-progress {
    fill: none;
    stroke: var(--primary);
    stroke-width: 10;
    stroke-linecap: round;
    stroke-dasharray: 283;
    stroke-dashoffset: 283;
    transition: stroke-dashoffset 1s ease;
}

.score-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary);
}

.score-stats {
    display: flex;
    justify-content: center;
    gap: 40px;
    margin-bottom: 40px;
    padding: 24px;
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
}

.stat {
    display: flex;
    flex-direction: column;
    align-items: center;
    min-width: 80px;
}

.stat [data-lucide] {
    width: 24px;
    height: 24px;
    margin-bottom: 8px;
    opacity: 0.6;
}

.stat.correct [data-lucide] {
    color: var(--success);
    opacity: 1;
}

.stat.incorrect [data-lucide] {
    color: var(--error);
    opacity: 1;
}

.stat.total [data-lucide] {
    color: var(--primary);
    opacity: 1;
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    line-height: 1.2;
}

.stat.correct .stat-value {
    color: var(--success);
}

.stat.incorrect .stat-value {
    color: var(--error);
}

.stat.total .stat-value {
    color: var(--primary);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-top: 4px;
}

.result-actions {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn-primary, .btn-secondary {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 28px;
    border-radius: 6px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.15s;
    min-width: 120px;
}

.btn-primary [data-lucide],
.btn-secondary [data-lucide] {
    width: 18px;
    height: 18px;
}

.btn-primary {
    background: var(--primary);
    color: white;
    border: none;
}

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

.btn-secondary {
    background: var(--bg-card);
    color: var(--text);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    border-color: var(--primary);
    color: var(--primary);
}

/* 錯題回顧 */
.review-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    flex-wrap: wrap;
    gap: 12px;
}

.review-header h2 {
    font-size: 1.5rem;
    font-weight: 600;
}

.review-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.review-item {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: var(--shadow);
}

.review-q-num {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 12px;
}

.review-q-text {
    margin-bottom: 20px;
    line-height: 1.7;
    font-size: 1rem;
}

.review-options {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 16px;
}

.review-opt {
    padding: 12px 16px;
    border-radius: 6px;
    font-size: 0.9rem;
    line-height: 1.5;
    background: var(--bg);
}

.review-opt.user-wrong {
    background: var(--error-bg);
    border: 1px solid var(--error);
}

.review-opt.correct {
    background: var(--success-bg);
    border: 1px solid var(--success);
}

.review-explanation {
    padding: 16px;
    background: var(--bg);
    border-radius: 6px;
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.7;
    border-left: 3px solid var(--primary);
}

/* 響應式 - 平板 */
@media (max-width: 768px) {
    .main-content {
        padding: 20px 16px;
    }

    .sidebar {
        padding: 0 16px;
    }

    .sidebar-nav {
        margin-left: 16px;
    }

    .sidebar-footer {
        display: none;
    }

    .quiz-setup {
        padding: 20px;
    }

    .question-container {
        padding: 20px;
    }

    .quiz-header {
        padding: 14px 16px;
    }

    .quiz-footer {
        padding: 14px 16px;
    }

    .score-stats {
        gap: 24px;
        padding: 20px;
    }

    .result-actions {
        flex-direction: column;
    }

    .btn-primary, .btn-secondary {
        width: 100%;
    }
}

/* 響應式 - 手機 */
@media (max-width: 480px) {
    html {
        font-size: 15px;
    }

    .sidebar {
        height: 52px;
        padding: 0 12px;
    }

    .sidebar-header h1 {
        font-size: 1rem;
    }

    .sidebar-nav {
        margin-left: 12px;
        gap: 4px;
    }

    .nav-btn {
        padding: 6px 12px;
        font-size: 0.8rem;
    }

    .main-content {
        padding: 16px 12px;
    }

    .screen-header h2 {
        font-size: 1.25rem;
    }

    .bank-item {
        padding: 14px 16px;
        flex-wrap: wrap;
        gap: 8px;
    }

    .bank-item .bank-count {
        font-size: 0.8rem;
    }

    .quiz-setup {
        padding: 16px;
    }

    .setup-header h3 {
        font-size: 1rem;
    }

    .mode-option {
        padding: 12px 14px;
    }

    .option-toggles {
        flex-direction: column;
        gap: 12px;
        padding: 14px;
    }

    .btn-start {
        padding: 14px;
    }

    .quiz-header {
        flex-direction: column;
        align-items: stretch;
        gap: 12px;
        padding: 12px 14px;
    }

    .btn-end {
        align-self: flex-end;
    }

    .question-container {
        padding: 16px;
    }

    .question-text {
        margin-bottom: 20px;
    }

    .text-original {
        font-size: 1rem;
    }

    .text-translated {
        font-size: 0.85rem;
        padding: 10px 12px;
    }

    .option {
        padding: 14px;
    }

    .option-letter {
        width: 28px;
        height: 28px;
        min-width: 28px;
        font-size: 0.8rem;
        margin-right: 12px;
    }

    .option-original {
        font-size: 0.9rem;
    }

    .option-translated {
        font-size: 0.8rem;
        padding: 6px 8px;
    }

    .translate-toggle {
        padding: 5px 10px;
        font-size: 0.7rem;
    }

    .translate-toggle span {
        display: none;
    }

    .feedback {
        padding: 14px;
        gap: 12px;
    }

    .feedback-icon {
        width: 24px;
        height: 24px;
        min-width: 24px;
    }

    .explanation {
        padding: 14px;
        font-size: 0.85rem;
    }

    .quiz-footer {
        padding: 12px 14px;
        gap: 8px;
    }

    .btn-nav {
        padding: 10px 16px;
        font-size: 0.85rem;
    }

    .btn-submit {
        padding: 12px 24px;
        font-size: 0.9rem;
    }

    .result-container {
        padding: 12px;
    }

    .result-container h2 {
        font-size: 1.25rem;
        margin-bottom: 24px;
    }

    .score-ring {
        width: 150px;
        height: 150px;
    }

    .score-text {
        font-size: 2rem;
    }

    .score-stats {
        gap: 16px;
        padding: 16px;
        flex-wrap: wrap;
    }

    .stat {
        min-width: 70px;
    }

    .stat-value {
        font-size: 1.5rem;
    }

    .stat-label {
        font-size: 0.8rem;
    }

    .review-item {
        padding: 16px;
    }

    .review-q-text {
        font-size: 0.95rem;
    }

    .review-opt {
        padding: 10px 14px;
        font-size: 0.85rem;
    }

    .review-explanation {
        padding: 12px;
        font-size: 0.8rem;
    }
}


/* Modal 樣式 */
.modal {
    position: fixed;
    inset: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.modal.hidden {
    display: none;
}

.modal-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
}

.modal-content {
    position: relative;
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    max-width: 600px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 24px;
    border-bottom: 1px solid var(--border);
}

.modal-header h3 {
    font-size: 1.125rem;
    font-weight: 600;
}

.modal-close {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: transparent;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    color: var(--text-secondary);
    transition: all 0.15s;
}

.modal-close:hover {
    background: var(--bg);
    color: var(--text);
}

.modal-body {
    padding: 24px;
}

.format-desc {
    margin-bottom: 16px;
    color: var(--text-secondary);
}

.format-example {
    background: var(--header-bg);
    color: #e2e8f0;
    padding: 16px;
    border-radius: var(--radius);
    font-size: 0.8rem;
    line-height: 1.6;
    overflow-x: auto;
    margin-bottom: 20px;
}

.format-fields h4 {
    font-size: 0.9rem;
    margin-bottom: 12px;
}

.format-fields ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.format-fields li {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.format-fields code {
    background: var(--bg);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.8rem;
    color: var(--primary);
}

.format-note {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    margin-top: 20px;
    padding: 14px;
    background: rgba(37, 99, 235, 0.08);
    border-radius: var(--radius);
    font-size: 0.85rem;
    color: var(--primary);
}

.format-note [data-lucide] {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
    margin-top: 1px;
}

/* 翻譯切換按鈕 */
.translate-toggle {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 0.75rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.15s;
    margin-left: auto;
}

.translate-toggle [data-lucide] {
    width: 14px;
    height: 14px;
}

.translate-toggle:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.translate-toggle.active {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
}

.question-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

/* 雙語顯示 */
.bilingual {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.bilingual.side-by-side {
    flex-direction: row;
    gap: 20px;
}

.bilingual.side-by-side > div {
    flex: 1;
}

.text-original {
    font-size: 1.0625rem;
    line-height: 1.75;
    white-space: pre-wrap;
    color: var(--text);
}

.text-translated {
    font-size: 0.95rem;
    line-height: 1.7;
    white-space: pre-wrap;
    color: var(--text-secondary);
    padding: 12px 16px;
    background: rgba(37, 99, 235, 0.05);
    border-left: 3px solid var(--primary);
    border-radius: 0 var(--radius) var(--radius) 0;
}

.text-translated.hidden {
    display: none;
}

.text-translated.loading {
    color: var(--text-muted);
    font-style: italic;
}

/* 選項雙語 */
.option-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.option-original {
    line-height: 1.6;
    padding-top: 4px;
}

.option-translated {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.5;
    padding: 8px 10px;
    background: rgba(37, 99, 235, 0.04);
    border-radius: 4px;
    border-left: 2px solid var(--primary);
}

.option-translated.hidden {
    display: none;
}

.option-translated.loading {
    color: var(--text-muted);
    font-style: italic;
}

/* 觸控優化 */
@media (hover: none) and (pointer: coarse) {
    .option:active:not(.disabled) {
        transform: scale(0.98);
    }

    .btn-start:active,
    .btn-submit:active,
    .btn-primary:active,
    .btn-secondary:active {
        transform: scale(0.98);
    }
}

/* 無障礙 - 減少動態效果 */
@media (prefers-reduced-motion: reduce) {
    * {
        transition-duration: 0.01ms !important;
        animation-duration: 0.01ms !important;
    }
}

/* ========== 練習錯題按鈕 ========== */

.btn-practice-wrong {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 10px 16px;
    background: var(--warning);
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: opacity 0.15s;
}

.btn-practice-wrong [data-lucide] {
    width: 16px;
    height: 16px;
}

.btn-practice-wrong:hover:not(:disabled) {
    opacity: 0.9;
}

.btn-practice-wrong:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-clear-history {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.15s;
}

.btn-clear-history [data-lucide] {
    width: 16px;
    height: 16px;
}

.btn-clear-history:hover {
    border-color: var(--error);
    color: var(--error);
    background: var(--error-bg);
}

/* ========== 題目 ID 標籤 ========== */
.q-id {
    display: inline-block;
    padding: 4px 10px;
    background: var(--bg);
    color: var(--text-secondary);
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
    font-family: monospace;
}

.q-id.hidden {
    display: none;
}

/* 題目練習記錄 */
.q-history {
    display: flex;
    align-items: center;
    margin-left: auto;
    margin-right: 8px;
}

.q-history.hidden {
    display: none;
}

.history-stat {
    display: inline-flex;
    align-items: center;
    padding: 3px 8px;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
    font-family: monospace;
}

.history-stat.good {
    background: var(--success-bg);
    color: var(--success);
    border: 1px solid var(--success);
}

.history-stat.medium {
    background: rgba(217, 119, 6, 0.1);
    color: var(--warning);
    border: 1px solid var(--warning);
}

.history-stat.poor {
    background: var(--error-bg);
    color: var(--error);
    border: 1px solid var(--error);
}

/* ========== 單題查看畫面 ========== */
.view-screen-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    flex-wrap: wrap;
    gap: 12px;
}

.view-screen-header h2 {
    font-size: 1.5rem;
    font-weight: 600;
}

.view-question-container {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: var(--shadow);
}

.view-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 16px;
    flex-wrap: wrap;
}

.view-id {
    display: inline-block;
    padding: 4px 10px;
    background: var(--primary);
    color: white;
    border-radius: 4px;
    font-size: 0.8rem;
    font-weight: 600;
    font-family: monospace;
}

.view-topic {
    display: inline-block;
    padding: 4px 10px;
    background: var(--bg);
    color: var(--text-secondary);
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 500;
}

.view-type {
    display: inline-block;
    padding: 4px 10px;
    background: var(--warning);
    color: white;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
}

.view-practice-info {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 12px 16px;
    background: var(--bg);
    border-radius: var(--radius);
    margin-bottom: 20px;
    flex-wrap: wrap;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.view-practice-info [data-lucide] {
    width: 18px;
    height: 18px;
    color: var(--primary);
}

.view-practice-info .correct {
    color: var(--success);
}

.view-practice-info .incorrect {
    color: var(--error);
}

.view-practice-info .last-time {
    color: var(--text-muted);
    font-size: 0.8rem;
}

.view-question-text {
    font-size: 1.0625rem;
    line-height: 1.75;
    margin-bottom: 24px;
    white-space: pre-wrap;
}

.view-options {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 20px;
}

.view-option {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 14px 16px;
    background: var(--bg);
    border: 2px solid transparent;
    border-radius: var(--radius);
}

.view-option.correct {
    background: var(--success-bg);
    border-color: var(--success);
}

.view-option .option-letter {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    min-width: 28px;
    background: var(--bg-card);
    border: 2px solid var(--border);
    border-radius: 50%;
    font-weight: 600;
    font-size: 0.8rem;
}

.view-option.correct .option-letter {
    background: var(--success);
    border-color: var(--success);
    color: white;
}

.view-option .option-text {
    flex: 1;
    line-height: 1.6;
    padding-top: 2px;
}

.view-option .answer-badge {
    padding: 2px 8px;
    background: var(--success);
    color: white;
    border-radius: 4px;
    font-size: 0.7rem;
    font-weight: 600;
    white-space: nowrap;
}

.view-explanation {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 16px;
    background: var(--bg);
    border-radius: var(--radius);
    border-left: 3px solid var(--primary);
    font-size: 0.9rem;
    line-height: 1.7;
    color: var(--text-secondary);
}

.view-explanation [data-lucide] {
    width: 20px;
    height: 20px;
    color: var(--warning);
    flex-shrink: 0;
    margin-top: 2px;
}

/* ========== 題目選擇列表（多個相同 ID 時） ========== */
.selection-notice {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 14px 16px;
    background: rgba(217, 119, 6, 0.1);
    border: 1px solid var(--warning);
    border-radius: var(--radius);
    margin-bottom: 16px;
    font-size: 0.9rem;
    color: var(--warning);
}

.selection-notice [data-lucide] {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

.selection-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.selection-item {
    padding: 14px 16px;
    background: var(--bg);
    border: 2px solid var(--border);
    border-radius: var(--radius);
    cursor: pointer;
    transition: all 0.15s;
}

.selection-item:hover {
    border-color: var(--primary);
    background: rgba(37, 99, 235, 0.02);
}

.selection-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 8px;
}

.selection-topic {
    padding: 3px 8px;
    background: var(--primary);
    color: white;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
}

.selection-id {
    padding: 3px 8px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
    font-family: monospace;
    color: var(--text-secondary);
}

.selection-preview {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* ========== 響應式調整 ========== */
@media (max-width: 768px) {
    .toolbar-section {
        flex-wrap: wrap;
    }
    
    .search-box-compact {
        flex: 1 1 200px;
    }
    
    .quiz-options-row {
        flex-direction: column;
        align-items: stretch;
        gap: 12px;
    }
    
    .mode-selector-compact {
        justify-content: center;
    }
    
    .option-toggles-compact {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .toolbar-section {
        gap: 8px;
    }
    
    .upload-btn-compact {
        padding: 8px 12px;
        font-size: 0.8rem;
    }
    
    .upload-btn-compact span {
        display: none;
    }
    
    .upload-btn-compact [data-lucide] {
        width: 18px;
        height: 18px;
    }
    
    .search-box-compact {
        padding: 6px 10px;
    }
    
    .setup-header-row {
        flex-direction: column;
        gap: 12px;
    }
    
    .practice-stats-compact {
        width: 100%;
        justify-content: flex-start;
    }
    
    .mode-selector-compact {
        flex-wrap: wrap;
        gap: 6px;
    }
    
    .mode-chip {
        padding: 6px 12px;
        font-size: 0.8rem;
    }
    
    .option-toggles-compact {
        flex-wrap: wrap;
        gap: 6px;
    }
    
    .toggle-chip {
        padding: 6px 10px;
        font-size: 0.75rem;
    }
    
    .wrong-practice-section {
        flex-wrap: wrap;
    }
    
    .btn-practice-wrong {
        flex: 1;
    }

    .view-practice-info {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }

    .view-question-container {
        padding: 16px;
    }

    /* 章節選擇器響應式 */
    .topic-selector-section {
        flex-direction: column;
        align-items: stretch;
        gap: 8px;
    }

    .topic-dropdown {
        max-width: none;
    }

    .topic-question-count {
        text-align: center;
    }
}