/* ===== 错题本样式 - 大小层级分明 ===== */
#tab-wrongbook {
    background: #F8FAFC;
    padding: 0 0 100px;
    min-height: 100vh;
}

#tab-wrongbook.active {
    display: block;
}

/* ===== Hero区域 ===== */
.wrongbook-hero {
    padding: 24px 20px 20px;
}

.wrongbook-hero h2 {
    font-size: 26px;
    font-weight: 700;
    color: #1E293B;
    letter-spacing: -0.5px;
    margin: 0 0 6px;
}

.wrongbook-hero-sub {
    font-size: 14px;
    color: #94A3B8;
    margin-bottom: 16px;
}

.wrongbook-hero-divider {
    width: 36px;
    height: 3px;
    background: #6C5CE7;
    border-radius: 2px;
}

/* ===== 主卡 - 全宽大数字 ===== */
.wrongbook-hero-card {
    margin: 0 16px;
    background: white;
    border-radius: 20px;
    padding: 28px 24px;
    box-shadow: 0 2px 12px rgba(0,0,0,0.05);
    text-align: center;
}

.wrongbook-hero-number {
    font-size: 56px;
    font-weight: 800;
    color: #6C5CE7;
    line-height: 1;
    letter-spacing: -2px;
    margin-bottom: 8px;
}

.wrongbook-hero-label {
    font-size: 14px;
    color: #94A3B8;
    margin-bottom: 16px;
}

/* 次要指标行 - 紧凑 */
.wrongbook-sub-stats {
    display: flex;
    justify-content: center;
    gap: 24px;
    padding-top: 16px;
    border-top: 1px solid #F1F5F9;
}

.wrongbook-sub-item {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    color: #64748B;
}

.wrongbook-sub-item .sub-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: #6C5CE7;
}

.wrongbook-sub-item .sub-num {
    font-weight: 700;
    color: #1E293B;
}

/* ===== 区块 ===== */
.wrongbook-section {
    margin: 20px 16px 0;
}

.wrongbook-section-title {
    font-size: 15px;
    font-weight: 600;
    color: #1E293B;
    margin-bottom: 14px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.wrongbook-section-title svg {
    width: 18px;
    height: 18px;
    stroke: #6C5CE7;
    stroke-width: 2;
}


/* ===== 筛选栏 ===== */
.wrongbook-filter-bar {
    display: flex;
    gap: 8px;
    overflow-x: auto;
    padding-bottom: 4px;
    -webkit-overflow-scrolling: touch;
}

.wrongbook-filter-bar::-webkit-scrollbar {
    display: none;
}

.filter-tag {
    flex-shrink: 0;
    padding: 8px 16px;
    background: white;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 500;
    color: #64748B;
    cursor: pointer;
    transition: all 0.2s ease;
    border: 1px solid #E2E8F0;
}

.filter-tag.active {
    background: #6C5CE7;
    color: white;
    border-color: #6C5CE7;
}

.filter-tag:active {
    transform: scale(0.96);
}

/* ===== 空状态 ===== */
.wrongbook-empty {
    text-align: center;
    padding: 60px 24px 40px;
}

.wrongbook-empty .empty-icon {
    width: 88px;
    height: 88px;
    background: #F3F0FF;
    border-radius: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 24px;
}

.wrongbook-empty .empty-icon svg {
    width: 40px;
    height: 40px;
    color: #6C5CE7;
}

.wrongbook-empty .empty-title {
    font-size: 20px;
    font-weight: 600;
    color: #1E293B;
    margin-bottom: 8px;
}

.wrongbook-empty .empty-desc {
    font-size: 14px;
    color: #94A3B8;
    margin-bottom: 32px;
    line-height: 1.5;
}

.wrongbook-list {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

/* ===== 错题卡片 ===== */
.wrong-card {
    background: white;
    border-radius: 16px;
    padding: 18px;
    cursor: pointer;
    transition: all 0.2s ease;
    position: relative;
    box-shadow: 0 1px 4px rgba(0,0,0,0.04);
}

.wrong-card.vocab { border-left: 3px solid #6C5CE7; }
.wrong-card.grammar { border-left: 3px solid #F39C12; }
.wrong-card.reading { border-left: 3px solid #10B981; }
.wrong-card.listening { border-left: 3px solid #8B5CF6; }

.wrong-card:active {
    transform: scale(0.99);
}

.wrong-card-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 12px;
}

.wrong-type-tag {
    padding: 4px 10px;
    border-radius: 8px;
    font-size: 11px;
    font-weight: 600;
    color: white;
}

.wrong-type-tag.vocab { background: #6C5CE7; }
.wrong-type-tag.grammar { background: #F39C12; }
.wrong-type-tag.reading { background: #10B981; }
.wrong-type-tag.listening { background: #8B5CF6; }

.wrong-reviewed-badge {
    padding: 4px 10px;
    border-radius: 8px;
    font-size: 11px;
    font-weight: 500;
    background: #D1FAE5;
    color: #059669;
}

.wrong-date {
    margin-left: auto;
    font-size: 11px;
    color: #94A3B8;
}

.wrong-question {
    font-size: 14px;
    color: #1E293B;
    line-height: 1.6;
    margin-bottom: 12px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.wrong-answer-compare {
    display: flex;
    gap: 16px;
    font-size: 12px;
    padding: 10px 12px;
    background: #F8FAFC;
    border-radius: 10px;
}

.your-answer.wrong { color: #EF4444; }
.correct-answer.right { color: #10B981; }

/* ===== 展开详情 ===== */
.wrong-detail {
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid #F1F5F9;
    display: none;
}

.wrong-options {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 16px;
}

.wrong-option {
    padding: 12px 14px;
    background: #F8FAFC;
    border-radius: 10px;
    font-size: 13px;
    color: #1E293B;
    line-height: 1.5;
    display: flex;
    align-items: flex-start;
    gap: 8px;
}

.wrong-option.option-correct {
    background: #D1FAE5;
    color: #065F46;
}

.wrong-option.option-wrong {
    background: #FEE2E2;
    color: #991B1B;
}

.opt-key {
    font-weight: 600;
    flex-shrink: 0;
    width: 20px;
}

.wrong-explanation {
    background: #F8FAFC;
    border-radius: 10px;
    padding: 14px;
    margin-bottom: 16px;
    border-left: 3px solid #6C5CE7;
}

.exp-label {
    font-size: 12px;
    font-weight: 600;
    color: #6C5CE7;
    margin-bottom: 8px;
}

.exp-content {
    font-size: 13px;
    color: #475569;
    line-height: 1.6;
}

.wrong-actions {
    display: flex;
    gap: 10px;
}

.action-btn {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 16px;
    border-radius: 12px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    border: none;
}

.action-btn svg {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}

.action-btn.ai-btn {
    background: #6C5CE7;
    color: white;
}

.action-btn.ai-btn:active {
    transform: scale(0.97);
}

.action-btn.master-btn {
    background: #10B981;
    color: white;
}

.action-btn.master-btn:active {
    transform: scale(0.97);
    background: #059669;
}

/* ===== 角标 ===== */
.wrong-book-badge {
    display: none;
    min-width: 18px;
    height: 18px;
    background: #EF4444;
    color: white;
    font-size: 11px;
    font-weight: 600;
    border-radius: 9px;
    padding: 0 5px;
    line-height: 18px;
    text-align: center;
    margin-left: auto;
}

/* ===== 变式训练入口 ===== */
.variant-entrance-card {
    margin-top: 20px;
    background: white;
    border-radius: 16px;
    padding: 18px;
    display: flex;
    align-items: center;
    gap: 14px;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: 0 1px 4px rgba(0,0,0,0.04);
}

.variant-entrance-card:active {
    transform: scale(0.99);
}

.variant-entrance-icon {
    width: 44px;
    height: 44px;
    background: #F3F0FF;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.variant-entrance-icon svg {
    width: 22px;
    height: 22px;
    color: #6C5CE7;
}

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

.variant-entrance-title {
    font-size: 15px;
    font-weight: 600;
    color: #1E293B;
    margin-bottom: 2px;
}

.variant-entrance-desc {
    font-size: 12px;
    color: #94A3B8;
}

.variant-entrance-count {
    flex-shrink: 0;
}

.variant-count-badge {
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 11px;
    font-weight: 600;
    background: #F3F0FF;
    color: #6C5CE7;
}

/* ===== 底部间距 ===== */
.wrongbook-bottom-spacer {
    height: 24px;
}

/* ===== 错题复习时间显示 ===== */
.wrong-review-time {
    font-size: 11px;
    color: #94A3B8;
    background: #F1F5F9;
    padding: 2px 8px;
    border-radius: 10px;
    margin-left: 8px;
    flex-shrink: 0;
}