/* ============================================
 * 错题本页面样式 (mistakes.css)
 * 对齐 theme.css 变量体系，支持日/夜双模式
 * ============================================ */

/* ===== 页面容器 ===== */
.mistakes-container {
    max-width: 1100px;
    margin: 32px auto;
    padding: 0 24px;
}

/* ===== 头部区域 ===== */
.mistakes-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
    flex-wrap: wrap;
    gap: 16px;
}
.mistakes-header-left h1 {
    font-size: 26px;
    font-weight: 800;
    color: #e8eafd;
    margin: 0 0 6px 0;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}
.mistakes-header-left p {
    font-size: 14px;
    color: var(--text-muted);
    margin: 0;
}

/* Tab 切换 */
.mistake-tabs {
    display: flex;
    gap: 4px;
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    padding: 4px;
}
.mistake-tab {
    padding: 8px 18px;
    border-radius: var(--radius-sm);
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.25s;
    border: none;
    background: none;
    white-space: nowrap;
}
.mistake-tab:hover { color: #e8eafd; }
.mistake-tab.active {
    background: var(--primary-gradient);
    color: white;
    box-shadow: 0 2px 10px rgba(124,58,237,0.3);
}
[data-theme="day"] .mistake-header-left h1 { color: #1E293B; }
[data-theme="day"] .mistake-header-left p { color: #64748B; }
[data-theme="day"] .mistake-tabs { background: #FFFFFF; border-color: #E2E8F0; }
[data-theme="day"] .mistake-tab { color: #475569; }
[data-theme="day"] .mistake-header-left h1 { color: #1E293B; }
[data-theme="day"] .mistake-header-left p { color: #64748B; }
[data-theme="day"] .mistake-tabs { background: #FFFFFF; border-color: #E2E8F0; }
[data-theme="day"] .mistake-tab { color: #475569; }
[data-theme="day"] .mistake-tab:hover { color: #1E293B; }
[data-theme="day"] .mistake-tab.active {
    background: linear-gradient(135deg, #4F6EF6, #6366F1);
    box-shadow: 0 2px 10px rgba(79,110,246,0.25);
}
[data-theme="day"] .mistake-stat-card { background: #FFFFFF; border-color: #E2E8F0; }
[data-theme="day"] .mistake-stat-num { color: #1E293B; }
[data-theme="day"] .mistake-stat-label { color: #64748B; }

/* ===== 统计行 ===== */
.mistake-stats-row {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin-bottom: 24px;
}
.mistake-stat-card {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    padding: 20px;
    text-align: center;
    position: relative;
    overflow: hidden;
}
.mistake-stat-icon {
    width: 40px; height: 40px;
    border-radius: 12px;
    display: flex; align-items: center; justify-content: center;
    font-size: 17px;
    margin: 0 auto 10px;
}
.msi-total   { background: rgba(124,58,237,0.15); color: var(--primary-light); }
.msi-today   { background: rgba(239,68,68,0.12);   color: #fca5a5; }
.msi-mastered{ background: rgba(34,197,94,0.12);   color: #86efac; }
.msi-rate    { background: rgba(217,119,6,0.12);     color: var(--accent-light); }
.mistake-stat-num {
    font-size: 28px;
    font-weight: 800;
    color: #e8eafd;
    font-family: var(--font-mono);
    line-height: 1.2;
}
.mistake-stat-label {
    font-size: 12px;
    color: var(--text-muted);
    font-weight: 500;
    margin-top: 4px;
}

/* ===== 筛选栏 ===== */
.filter-bar {
    display: flex;
    gap: 12px;
    align-items: center;
    margin-bottom: 20px;
    flex-wrap: wrap;
}
.filter-search {
    flex: 1;
    min-width: 200px;
    padding: 10px 16px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--glass-border);
    background: var(--glass-bg);
    color: #e8eafd;
    font-size: 14px;
    outline: none;
    transition: border-color 0.25s;
    backdrop-filter: var(--glass-blur);
}
.filter-search:focus {
    border-color: var(--primary-light);
    box-shadow: 0 0 0 3px rgba(124,58,237,0.12);
}
.filter-select {
    padding: 10px 14px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--glass-border);
    background: var(--glass-bg);
    color: #e8eafd;
    font-size: 13px;
    cursor: pointer;
    outline: none;
    min-width: 140px;
}
.filter-select option { background: #1a1c30; color: #e8eafd; }
[data-theme="day"] .filter-search { background: #FFFFFF; border-color: #E2E8F0; color: #1E293B; }
[data-theme="day"] .filter-select { background: #FFFFFF; border-color: #E2E8F0; color: #475569; }
[data-theme="day"] .filter-select option { background: #FFFFFF; color: #1E293B; }

/* ===== 错题卡片列表 ===== */
.mistakes-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}
.mistake-card {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    padding: 20px 24px;
    transition: all 0.25s;
    position: relative;
    overflow: hidden;
}
.mistake-card:hover {
    border-color: rgba(124,58,237,0.25);
    transform: translateY(-1px);
    box-shadow: 0 6px 24px rgba(0,0,0,0.12);
}
[data-theme="day"] .mistake-card {
    background: #FFFFFF;
    border-color: #E2E8F0;
    box-shadow: 0 1px 3px rgba(100,116,139,0.05);
}
[data-theme="day"] .mistake-card:hover {
    border-color: rgba(79,110,246,0.25);
    box-shadow: 0 6px 20px rgba(100,116,139,0.08);
}
[data-theme="day"] .mistake-card-header { border-bottom-color: #E2E8F0; }

.mistake-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 12px;
}
.mistake-card-badges {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}
.error-type-tag {
    padding: 3px 10px;
    border-radius: 6px;
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.03em;
}
.et-concept      { background: rgba(124,58,237,0.12); color: #a78bfa; border: 1px solid rgba(124,58,237,0.2); }
.et-calculation  { background: rgba(59,130,246,0.12); color: #93c5fd; border: 1px solid rgba(59,130,246,0.2); }
.et-careless     { background: rgba(245,158,11,0.12); color: #fcd34d; border: 1px solid rgba(245,158,11,0.2); }
.et-unknown      { background: rgba(156,163,175,0.12); color: #9ca3af; border: 1px solid rgba(156,163,175,0.2); }
.mistake-count-badge {
    padding: 3px 10px;
    border-radius: 6px;
    font-size: 11px;
    font-weight: 600;
    background: rgba(239,68,68,0.10);
    color: #fca5a5;
    border: 1px solid rgba(239,68,68,0.15);
}
.next-review-badge {
    padding: 3px 10px;
    border-radius: 6px;
    font-size: 11px;
    font-weight: 500;
    background: rgba(34,197,94,0.08);
    color: #86efac;
    border: 1px solid rgba(34,197,94,0.12);
}
.next-review-badge.overdue {
    background: rgba(239,68,68,0.08);
    color: #fca5a5;
    border-color: rgba(239,68,68,0.12);
}

.mistake-question {
    font-size: 15px;
    font-weight: 600;
    color: #e8eafd;
    line-height: 1.6;
    margin-bottom: 10px;
}
[data-theme="day"] .mistake-question { color: #1E293B; }
[data-theme="day"] .mistake-count-badge { background: rgba(220,38,38,0.06); color: #dc2626; border-color: rgba(220,38,38,0.12); }
[data-theme="day"] .next-review-badge { background: rgba(22,163,74,0.06); color: #16a34a; border-color: rgba(22,163,74,0.12); }
[data-theme="day"] .next-review-badge.overdue { background: rgba(220,38,38,0.06); color: #dc2626; border-color: rgba(220,38,38,0.12); }

.mistake-answer-row {
    display: flex;
    gap: 20px;
    margin-bottom: 10px;
    font-size: 13px;
}
.mistake-wrong {
    color: #fca5a5;
    background: rgba(239,68,68,0.06);
    padding: 6px 12px;
    border-radius: 6px;
    border: 1px solid rgba(239,68,68,0.1);
}
[data-theme="day"] .mistake-wrong { color: #dc2626; background: rgba(220,38,38,0.06); border-color: rgba(220,38,38,0.15); }
.mistake-correct {
    color: #86efac;
    background: rgba(34,197,94,0.06);
    padding: 6px 12px;
    border-radius: 6px;
    border: 1px solid rgba(34,197,94,0.1);
}
[data-theme="day"] .mistake-correct { color: #16a34a; background: rgba(22,163,74,0.06); border-color: rgba(22,163,74,0.15); }

.mistake-analysis {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.6;
    padding: 10px 14px;
    background: rgba(255,255,255,0.04);
    border-radius: var(--radius-sm);
    margin-bottom: 12px;
    max-height: 120px;
    overflow-y: auto;
}
.mistake-analysis::-webkit-scrollbar { width: 4px; }
.mistake-analysis::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.1); border-radius: 2px; }
[data-theme="day"] .mistake-analysis { color: #475569; background: #F8FAFC; }
[data-theme="day"] .mistake-analysis::-webkit-scrollbar-thumb { background: #CBD5E1; }

.mistake-card-actions {
    display: flex;
    gap: 8px;
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px solid rgba(255,255,255,0.06);
}
[data-theme="day"] .mistake-card-actions { border-top-color: #E2E8F0; }
.btn-mistake {
    padding: 7px 16px;
    border-radius: var(--radius-sm);
    font-size: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.25s;
    border: 1px solid;
    background: none;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}
.btn-retry {
    border-color: rgba(99,102,241,0.3);
    color: var(--primary-light);
}
.btn-retry:hover {
    background: rgba(99,102,241,0.1);
    border-color: var(--primary-light);
}
.btn-master {
    border-color: rgba(34,197,94,0.3);
    color: #86efac;
}
.btn-master:hover {
    background: rgba(34,197,94,0.1);
    border-color: #86efac;
}
.btn-delete {
    border-color: rgba(239,68,68,0.2);
    color: #fca5a5;
    margin-left: auto;
}
.btn-delete:hover {
    background: rgba(239,68,68,0.08);
    border-color: #fca5a5;
}
[data-theme="day"] .btn-retry { border-color: rgba(79,110,246,0.3); color: #4F6EF6; }
[data-theme="day"] .btn-retry:hover { background: rgba(79,110,246,0.06); }
[data-theme="day"] .btn-master { border-color: rgba(22,163,74,0.3); color: #16a34a; }
[data-theme="day"] .btn-master:hover { background: rgba(22,163,74,0.06); }
[data-theme="day"] .btn-delete:hover { background: rgba(220,38,38,0.06); }

/* ===== SM-2 艾宾浩斯信息区 (Phase 2.3) ===== */
.sm2-info-row {
    display: flex;
    gap: 14px;
    margin-bottom: 12px;
    padding: 10px 14px;
    background: rgba(124,58,237,0.04);
    border: 1px solid rgba(124,58,237,0.08);
    border-radius: var(--radius-sm);
    flex-wrap: wrap;
}
[data-theme="day"] .sm2-info-row {
    background: rgba(99,102,241,0.04);
    border-color: rgba(99,102,241,0.08);
}

/* EF 容易因子指示器 */
.sm2-indicator {
    display: flex; align-items: center; gap: 8px;
    font-size: 11px; flex-shrink: 0;
}
.sm2-label { font-weight: 700; color: var(--primary-light); font-size: 11px;
    white-space: nowrap; }
[data-theme="day"] .sm2-label { color: #4F6EF6; }

.sm2-bar-track {
    width: 60px; height: 6px; border-radius: 3px;
    background: rgba(255,255,255,0.06); overflow: hidden;
}
[data-theme="day"] .sm2-bar-track { background: #E2E8F0; }
.sm2-bar-fill {
    height: 100%; border-radius: 3px;
    transition: width 0.5s ease;
}

.sm2-val { font-family: var(--font-mono); font-size: 12px; font-weight: 700; min-width: 34px; text-align: right; }
.sm2-tag {
    font-size: 9px; padding: 1px 7px; border-radius: 4px;
    font-weight: 700; white-space: nowrap;
}

/* 重复次数 + 间隔 */
.sm2-rep-indicator {
    display: flex; align-items: center; gap: 8px;
    font-size: 11px; margin-left: auto;
}
.sm2-rep-label { color: var(--accent-light); font-weight: 600; white-space: nowrap; }
.sm2-interval-label { color: var(--text-muted); font-size: 10px; white-space: nowrap; }
.sm2-rep-bar {
    width: 50px; height: 5px; border-radius: 3px;
    background: rgba(255,255,255,0.06); overflow: hidden;
}
[data-theme="day"] .sm2-rep-bar { background: #E2E8F0; }
.sm2-rep-fill {
    height: 100%; border-radius: 3px;
    background: linear-gradient(90deg, #667eea, #a78bfa);
    transition: width 0.5s ease;
}

/* ===== 空状态 ===== */
.empty-mistakes {
    text-align: center;
    padding: 64px 20px;
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
}
.empty-mistakes i { font-size: 48px; color: #374151; margin-bottom: 16px; }
.empty-mistakes p { font-size: 15px; color: var(--text-secondary); margin-bottom: 8px; }
.empty-mistakes small { font-size: 13px; color: var(--text-muted); display: block; margin-bottom: 20px; }
[data-theme="day"] .empty-mistakes i { color: #94A3B8; }
[data-theme="day"] .empty-mistakes { background: #FFFFFF; border-color: #E2E8F0; }

/* ===== 重测弹窗（Quiz Overlay）====== */
.quiz-overlay {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.75);
    backdrop-filter: blur(12px);
    z-index: 9999;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.3s ease;
}
.quiz-overlay.show { display: flex; }

.quiz-panel {
    width: 520px;
    max-width: 90vw;
    max-height: 85vh;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    padding: 32px;
    overflow-y: auto;
    position: relative;
    animation: slideUp 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
}
[data-theme="day"] .quiz-panel {
    background: #FFFFFF;
    border-color: #E2E8F0;
    box-shadow: 0 20px 60px rgba(0,0,0,0.15);
}

@keyframes slideUp { from { opacity: 0; transform: translateY(30px) scale(0.96); } to { opacity: 1; transform: translateY(0) scale(1); } }

.quiz-close {
    position: absolute;
    top: 16px; right: 16px;
    width: 32px; height: 32px;
    border-radius: 50%;
    border: 1px solid var(--glass-border);
    background: none;
    color: var(--text-secondary);
    font-size: 16px;
    cursor: pointer;
    display: flex; align-items: center; justify-content: center;
    transition: all 0.2s;
}
.quiz-close:hover { background: rgba(239,68,68,0.1); color: #fca5a5; border-color: rgba(239,68,68,0.2); }

.quiz-title {
    font-size: 18px;
    font-weight: 700;
    color: #e8eafd;
    margin-bottom: 6px;
}
[data-theme="day"] .quiz-title { color: #1E293B; }
.quiz-hint { font-size: 13px; color: var(--text-muted); margin-bottom: 24px; }

.quiz-question-text {
    font-size: 16px;
    font-weight: 600;
    color: #e8eafd;
    line-height: 1.7;
    margin-bottom: 20px;
    padding: 16px;
    background: rgba(255,255,255,0.04);
    border-radius: var(--radius-md);
    border-left: 3px solid var(--primary);
}
[data-theme="day"] .quiz-question-text { color: #1E293B; background: #F1F5F9; }

.quiz-options { display: flex; flex-direction: column; gap: 10px; margin-bottom: 24px; }
.quiz-option {
    padding: 14px 18px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--glass-border);
    background: var(--glass-bg);
    color: #e8eafd;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 12px;
}
.quiz-option:hover {
    border-color: var(--primary-light);
    background: rgba(124,58,237,0.06);
}
[data-theme="day"] .quiz-option { border-color: #E2E8F0; background: #FFFFFF; color: #334155; }
[data-theme="day"] .quiz-option:hover { border-color: rgba(79,110,246,0.4); background: rgba(79,110,246,0.04); }
.quiz-option.selected { border-color: var(--primary); background: rgba(124,58,237,0.12); }
.quiz-option.correct { border-color: #22c55e; background: rgba(34,197,94,0.1); color: #86efac; }
.quiz-option.wrong { border-color: #ef4444; background: rgba(239,68,68,0.1); color: #fca5a5; }

.quiz-quality-btns {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
    margin-top: 16px;
}
.quality-btn {
    padding: 12px 8px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--glass-border);
    background: var(--glass-bg);
    color: var(--text-secondary);
    font-size: 12px;
    font-weight: 600;
    cursor: pointer;
    text-align: center;
    transition: all 0.2s;
}
.quality-btn:hover { border-color: var(--primary-light); color: #e8eafd; }
[data-theme="day"] .quality-btn { background: #FFFFFF; border-color: #E2E8F0; color: #475569; }
[data-theme="day"] .quality-btn:hover { border-color: rgba(79,110,246,0.4); color: #4F6EF6; }
.quality-btn.q0:hover { border-color: #ef4444; color: #fca5a5; }
.quality-btn.q3 { border-color: rgba(34,197,94,0.3); color: #86efac; }
.quiz-result-msg {
    margin-top: 16px;
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 600;
    text-align: center;
    display: none;
}
.quiz-result-success { background: rgba(34,197,94,0.08); color: #86efac; display: block; border: 1px solid rgba(34,197,94,0.15); }
.quiz-result-fail { background: rgba(239,68,68,0.08); color: #fca5a5; display: block; border: 1px solid rgba(239,68,68,0.15); }

/* ===== 分页 ===== */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
    margin-top: 24px;
}
.page-btn {
    padding: 8px 14px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--glass-border);
    background: var(--glass-bg);
    color: var(--text-secondary);
    font-size: 13px;
    cursor: pointer;
    transition: all 0.2s;
}
.page-btn:hover:not(:disabled) {
    border-color: var(--primary-light);
    color: #e8eafd;
}
.page-btn.active { background: var(--primary-gradient); color: white; border-color: transparent; }
.page-btn:disabled { opacity: 0.35; cursor: not-allowed; }
.page-info { font-size: 13px; color: var(--text-muted); }
[data-theme="day"] .page-btn { background: #FFFFFF; border-color: #E2E8F0; color: #475569; }
[data-theme="day"] .page-btn:hover:not(:disabled) { border-color: rgba(79,110,246,0.4); color: #4F6EF6; }
[data-theme="day"] .page-info { color: #94A3B8; }

/* ===== 响应式 ===== */
@media (max-width: 768px) {
    .mistake-stats-row { grid-template-columns: repeat(2, 1fr); }
    .mistakes-header { flex-direction: column; align-items: flex-start; }
    .filter-bar { flex-direction: column; }
    .filter-search, .filter-select { width: 100%; }
    .quiz-panel { width: 95vw; padding: 20px; }
    .quiz-quality-btns { grid-template-columns: repeat(2, 1fr); }
    .mistake-card-actions { flex-wrap: wrap; }
}
@media (min-width: 769px) and (max-width: 1024px) {
    .mistake-stats-row { grid-template-columns: repeat(4, 1fr); }
}

/* ========== ★ 个人笔记区域（需求6） ========== */
.mistake-note-area {
    margin-top: 10px;
    border: 1px solid rgba(167,139,250,0.15);
    border-radius: 8px;
    overflow: hidden;
    background: rgba(167,139,250,0.03);
}
.mistake-note-header {
    display: flex; align-items: center;
    padding: 8px 12px; cursor: pointer;
    font-size: 12px; font-weight: 600;
    color: #c4b5fd; transition: background 0.2s;
}
.mistake-note-header:hover { background: rgba(167,139,250,0.06); }
.mistake-note-body { padding: 0 10px 10px; }
.mistake-note-input {
    width: 100%; min-height: 60px; max-height: 150px;
    background: rgba(15,17,30,0.6);
    border: 1px solid rgba(167,139,250,0.2); border-radius: 6px;
    color: rgba(240,243,255,0.85);
    font-size: 12px; padding: 8px 10px;
    font-family: 'Inter', sans-serif; line-height: 1.5;
    resize: vertical; outline: none; transition: border-color 0.2s;
}
.mistake-note-input:focus {
    border-color: #a78bfa;
    box-shadow: 0 0 0 2px rgba(167,139,250,0.15);
}
.mistake-note-actions {
    display: flex; justify-content: flex-end; align-items: center;
    margin-top: 6px; gap: 8px;
}
.note-save-hint { font-size: 11px; margin-right: auto; font-style: italic; }
.btn-note-export {
    font-size: 11px !important; padding: 4px 10px !important;
    border-color: rgba(34,197,94,0.3) !important; color: #86efac !important;
}
.btn-note-export:hover { background: rgba(34,197,94,0.1) !important; }

/* AI错题分析按钮 */
.btn-ai-analysis {
    padding: 8px 16px; border-radius: var(--radius-sm);
    font-size: 12px; font-weight: 600; cursor: pointer;
    border: 1px solid rgba(139,92,246,0.3);
    background: linear-gradient(135deg, rgba(139,92,246,0.1), rgba(168,85,247,0.05));
    color: #c4b5fd;
    display: inline-flex; align-items: center; gap: 6px;
    transition: all 0.25s; white-space: nowrap; margin-left: auto;
}
.btn-ai-analysis:hover {
    background: linear-gradient(135deg, rgba(139,92,246,0.2), rgba(168,85,247,0.1));
    border-color: #a78bfa; transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(139,92,246,0.15);
}

[data-theme="day"] .mistake-note-area { background: rgba(139,92,246,0.03); border-color: rgba(139,92,246,0.15); }
[data-theme="day"] .mistake-note-input { background: white; border-color: rgba(139,92,246,0.25); color: #334155; }