/* ═══════════════════════════════════════════════════════════════
   学习中心 - 高级黑白灰艺术UI
   "墨韵学堂" - 水墨留白美学 × 瑞士国际主义排版
   色板: #000 #111 #222 #333 #666 #999 #BBB #CCC #DDD #E5E5E5 #EEEEEE #F5F5F5 #FAFAFA #FFF
   ═══════════════════════════════════════════════════════════════ */

/* ====== 基础覆盖 - 作用于 #layer-study ====== */
#layer-study {
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "PingFang SC", "Helvetica Neue", sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    background: #FAFAFA;
}

#layer-study * {
    box-sizing: border-box;
}

/* ====== 顶部导航栏 ====== */
#layer-study .nav-bar {
    background: #FFFFFF;
    border-bottom: 1px solid #EEEEEE;
    padding: 0 16px;
    height: 52px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
}

#layer-study .nav-bar .nav-title {
    font-size: 17px;
    font-weight: 700;
    color: #111111;
    letter-spacing: -0.3px;
    /* [FIX-网课标题重合v2] v1只加了flex却没覆盖基础.nav-title的position:absolute/left:50%/max-width:60%，
       导致标题仍是绝对居中的60%宽度，长标题照样压到右侧按钮组。v2显式恢复为普通flex项：
       取消绝对定位与居中位移，让 flex:1+min-width:0 真正生效，长标题在按钮之间省略而非重合。 */
    position: static;
    left: auto;
    right: auto;
    transform: none;
    max-width: none;
    flex: 1 1 auto;
    min-width: 0;
    margin: 0 8px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    text-align: center;
}

#layer-study .nav-bar .nav-icon {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    cursor: pointer;
    color: #333333;
    transition: all 0.2s ease;
}

#layer-study .nav-bar .nav-icon:hover {
    background: #F0F0F0;
}

#layer-study .nav-bar .nav-icon:active {
    background: #E5E5E5;
    transform: scale(0.92);
}

#layer-study .nav-bar .nav-icon i {
    font-size: 15px;
}

/* ====== Study Tab 系统 ====== */
#layer-study .study-tab {
    display: none;
    flex-direction: column;
    height: 100%;
    width: 100%;
    position: absolute;
    top: 0;
    left: 0;
    background: #FAFAFA;
    padding-bottom: 50px; /* 给底部 study-bottom-nav 留出空间 */
}

#layer-study .study-tab.active {
    display: flex;
}

/* ====== 滚动区域 ====== */
#layer-study .scroll-y {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    -webkit-overflow-scrolling: touch;
    padding: 16px !important;
    background: #FAFAFA !important;
}

#layer-study .scroll-y::-webkit-scrollbar {
    width: 3px;
}

#layer-study .scroll-y::-webkit-scrollbar-track {
    background: transparent;
}

#layer-study .scroll-y::-webkit-scrollbar-thumb {
    background: #DDDDDD;
    border-radius: 2px;
}

/* ====== 学习模式横幅 ====== */
#layer-study .study-master-banner {
    background: #111111;
    color: #FFFFFF;
    padding: 12px 16px;
    border-radius: 12px;
    font-size: 13px;
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 16px;
    font-weight: 400;
    letter-spacing: 0.2px;
    animation: studyBannerIn 0.4s ease;
}

#layer-study .study-master-banner i {
    font-size: 12px;
    opacity: 0.7;
}

#layer-study .study-master-banner span {
    margin-left: auto;
    font-size: 12px;
    opacity: 0.6;
    cursor: pointer;
    text-decoration: none;
    border-bottom: 1px solid rgba(255,255,255,0.3);
    padding-bottom: 1px;
}

#layer-study .study-master-banner span:hover {
    opacity: 1;
}

@keyframes studyBannerIn {
    from { opacity: 0; transform: translateY(-8px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ====== SC-Card 统一卡片系统 - 高级重写 ====== */
#layer-study .sc-card {
    background: #FFFFFF;
    border-radius: 16px;
    margin-bottom: 16px;
    border: 1px solid #EEEEEE;
    overflow: hidden;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

#layer-study .sc-card:hover {
    box-shadow: 0 2px 12px rgba(0,0,0,0.04);
}

#layer-study .sc-card-head {
    display: flex;
    align-items: center;
    padding: 16px 18px 0;
    gap: 8px;
}

#layer-study .sc-card-title {
    font-size: 15px;
    font-weight: 700;
    color: #111111;
    letter-spacing: -0.2px;
}

#layer-study .sc-card-sub {
    font-size: 12px;
    color: #999999;
    font-weight: 400;
}

#layer-study .sc-card-action {
    font-size: 12px;
    color: #999999;
    cursor: pointer;
    margin-left: auto;
    transition: color 0.2s;
    font-weight: 500;
}

#layer-study .sc-card-action:hover {
    color: #333333;
}

#layer-study .sc-card-action:active {
    color: #111111;
}

#layer-study .sc-card-body {
    padding: 14px 18px 18px;
}

/* ====== 统计行 ====== */
#layer-study .sc-stats-row {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
    margin-bottom: 14px;
}

#layer-study .sc-stats-row--3 {
    grid-template-columns: repeat(3, 1fr);
}

#layer-study .sc-stat {
    text-align: center;
    padding: 8px 4px;
}

#layer-study .sc-stat-val {
    font-size: 24px;
    font-weight: 200;
    color: #111111;
    line-height: 1.2;
    letter-spacing: -1px;
}

#layer-study .sc-stat-lbl {
    font-size: 11px;
    color: #999999;
    margin-top: 4px;
    font-weight: 400;
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

/* ====== 进度条 - 极简 ====== */
#layer-study .sc-progress-track {
    height: 3px;
    background: #EEEEEE;
    border-radius: 2px;
    overflow: hidden;
    margin-top: 4px;
}

#layer-study .sc-progress-fill {
    height: 100%;
    background: #111111;
    border-radius: 2px;
    transition: width 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

/* ====== 陪伴卡片 ====== */
#layer-study .sc-card--companion {
    cursor: pointer;
    transition: transform 0.15s ease;
}

#layer-study .sc-card--companion:active {
    transform: scale(0.98);
}

#layer-study .sc-companion-icon {
    width: 32px;
    height: 32px;
    border-radius: 10px;
    background: #F5F5F5;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #333333;
}

#layer-study .sc-companion-icon svg {
    display: block;
}

#layer-study .sc-companion-big {
    font-size: 32px;
    font-weight: 200;
    color: #111111;
    margin-bottom: 14px;
    letter-spacing: -1.5px;
    line-height: 1;
}

#layer-study .sc-stat-chip {
    background: #F5F5F5;
    border-radius: 10px;
    padding: 12px 8px;
    text-align: center;
}

#layer-study .sc-stat-chip-val {
    font-size: 15px;
    font-weight: 600;
    color: #111111;
    line-height: 1.2;
}

#layer-study .sc-stat-chip-lbl {
    font-size: 10px;
    color: #999999;
    margin-top: 4px;
    letter-spacing: 0.5px;
}

#layer-study .sc-companion-milestone {
    background: #111111;
    color: #FFFFFF;
    font-size: 12px;
    padding: 8px 14px;
    border-radius: 8px;
    margin-top: 12px;
    text-align: center;
    font-weight: 500;
}

/* ====== 学习工具网格 ====== */
#layer-study .sc-tools-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    padding-top: 4px;
}

#layer-study .sc-tool-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    padding: 14px 8px;
    border-radius: 14px;
    transition: all 0.2s ease;
}

#layer-study .sc-tool-item:hover {
    background: #F5F5F5;
}

#layer-study .sc-tool-item:active {
    background: #EEEEEE;
    transform: scale(0.95);
}

#layer-study .sc-tool-item span {
    font-size: 11px;
    color: #666666;
    font-weight: 500;
    letter-spacing: 0.3px;
}

#layer-study .sc-tool-icon {
    width: 46px;
    height: 46px;
    border-radius: 14px;
    background: #F5F5F5;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    color: #333333;
    transition: all 0.2s ease;
    border: 1px solid #EEEEEE;
}

#layer-study .sc-tool-item:active .sc-tool-icon {
    background: #E5E5E5;
    border-color: #DDDDDD;
}

/* ====== 底部导航栏 ====== */
#layer-study .study-bottom-nav {
    display: flex;
    background: #FFFFFF;
    border-top: 1px solid #EEEEEE;
    padding: 8px 0;
    padding-bottom: max(8px, env(safe-area-inset-bottom));
    /* 修复：所有 .study-tab 都是 position:absolute 脱离 flex 流，
       底部栏必须用 absolute 钉在底部，否则会被推到顶部并被 tab 盖住 */
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 51;
}

#layer-study .study-bottom-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 3px;
    padding: 6px 0;
    cursor: pointer;
    color: #BBBBBB;
    transition: color 0.2s ease;
    position: relative;
}

#layer-study .study-bottom-item i {
    font-size: 18px;
    transition: transform 0.2s ease;
}

#layer-study .study-bottom-item span {
    font-size: 10px;
    font-weight: 500;
    letter-spacing: 0.3px;
}

#layer-study .study-bottom-item.active {
    color: #111111;
}

#layer-study .study-bottom-item.active::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 2px;
    background: #111111;
    border-radius: 1px;
}

#layer-study .study-bottom-item:active i {
    transform: scale(0.9);
}

/* ====== 资料分类标签栏 ====== */
#layer-study .study-category-bar {
    display: flex;
    gap: 0;
    padding: 0 16px;
    background: #FFFFFF;
    border-bottom: 1px solid #EEEEEE;
    overflow-x: auto;
    scrollbar-width: none;
    -ms-overflow-style: none;
}

#layer-study .study-category-bar::-webkit-scrollbar {
    display: none;
}

#layer-study .study-cat-tab {
    display: inline-flex;
    align-items: center;
    padding: 14px 16px;
    font-size: 13px;
    color: #999999;
    white-space: nowrap;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    font-weight: 500;
    transition: all 0.2s ease;
    position: relative;
}

#layer-study .study-cat-tab:hover {
    color: #666666;
}

#layer-study .study-cat-tab.active {
    color: #111111;
    font-weight: 600;
    border-bottom-color: #111111;
    background: transparent;
}

/* ====== 资料卡片 ====== */
#layer-study .study-material-card {
    background: #FFFFFF;
    border-radius: 14px;
    padding: 18px;
    margin-bottom: 12px;
    border: 1px solid #EEEEEE;
    transition: all 0.2s ease;
}

#layer-study .study-material-card:hover {
    border-color: #DDDDDD;
    box-shadow: 0 2px 12px rgba(0,0,0,0.03);
}

#layer-study .study-material-card .mat-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 10px;
}

#layer-study .study-material-card .mat-name {
    font-size: 15px;
    font-weight: 600;
    color: #111111;
    letter-spacing: -0.2px;
}

#layer-study .study-material-card .mat-badge {
    font-size: 10px;
    padding: 3px 8px;
    border-radius: 4px;
    background: #F0F0F0;
    color: #666666;
    font-weight: 500;
    letter-spacing: 0.3px;
}

#layer-study .study-material-card .mat-badge.builtin {
    background: #111111;
    color: #FFFFFF;
}

#layer-study .study-material-card .mat-preview {
    font-size: 13px;
    color: #999999;
    line-height: 1.6;
    margin-bottom: 14px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

#layer-study .study-material-card .mat-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 12px;
    border-top: 1px solid #F5F5F5;
    font-size: 12px;
    color: #BBBBBB;
}

#layer-study .study-material-card .mat-actions {
    display: flex;
    gap: 4px;
}

#layer-study .study-material-card .mat-actions button {
    padding: 6px 12px;
    border: none;
    background: none;
    font-size: 12px;
    color: #666666;
    cursor: pointer;
    border-radius: 6px;
    transition: all 0.2s ease;
    font-weight: 500;
}

#layer-study .study-material-card .mat-actions button:hover {
    background: #F5F5F5;
    color: #111111;
}

#layer-study .study-material-card .mat-actions button:active {
    background: #EEEEEE;
}

/* ====== 复习计划卡片 ====== */
#layer-study .study-plan-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

#layer-study .study-plan-item {
    background: #FFFFFF;
    border-radius: 12px;
    padding: 14px 16px;
    display: flex;
    align-items: center;
    gap: 14px;
    border: 1px solid #EEEEEE;
    transition: all 0.2s ease;
}

#layer-study .study-plan-item:active {
    transform: scale(0.99);
}

#layer-study .study-plan-item .plan-check {
    width: 22px;
    height: 22px;
    border-radius: 50%;
    border: 2px solid #DDDDDD;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    flex-shrink: 0;
    transition: all 0.2s ease;
}

#layer-study .study-plan-item .plan-check:hover {
    border-color: #999999;
}

#layer-study .study-plan-item .plan-check.completed {
    background: #111111;
    border-color: #111111;
    color: #FFFFFF;
}

#layer-study .study-plan-item .plan-check.completed::after {
    content: '✓';
    font-size: 11px;
    font-weight: bold;
}

#layer-study .study-plan-item .plan-info {
    flex: 1;
    min-width: 0;
}

#layer-study .study-plan-item .plan-name {
    font-size: 14px;
    font-weight: 600;
    color: #111111;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

#layer-study .study-plan-item .plan-meta {
    font-size: 12px;
    color: #999999;
    margin-top: 3px;
}

#layer-study .study-plan-item .plan-actions {
    display: flex;
    gap: 4px;
}

#layer-study .study-plan-item .plan-actions button {
    padding: 6px 10px;
    border: none;
    background: #F5F5F5;
    color: #666666;
    font-size: 11px;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.15s ease;
}

#layer-study .study-plan-item .plan-actions button:hover {
    background: #EEEEEE;
    color: #333333;
}

#layer-study .study-plan-item .plan-actions button:active {
    background: #E5E5E5;
}

/* ====== 计划详情卡片 ====== */
#layer-study .study-plan-detail {
    background: #FFFFFF;
    border-radius: 14px;
    padding: 18px;
    margin-bottom: 12px;
    border: 1px solid #EEEEEE;
}

#layer-study .study-plan-detail .plan-detail-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 12px;
}

#layer-study .study-plan-detail .plan-detail-name {
    font-size: 16px;
    font-weight: 700;
    color: #111111;
    letter-spacing: -0.3px;
}

#layer-study .study-plan-detail .plan-detail-status {
    font-size: 11px;
    padding: 3px 10px;
    border-radius: 12px;
    font-weight: 500;
}

#layer-study .study-plan-detail .plan-detail-status.active {
    background: #111111;
    color: #FFFFFF;
}

#layer-study .study-plan-detail .plan-detail-status.paused {
    background: #F0F0F0;
    color: #999999;
}

#layer-study .study-plan-detail .plan-detail-progress {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 12px;
}

#layer-study .study-plan-detail .plan-progress-bar {
    flex: 1;
    height: 3px;
    background: #EEEEEE;
    border-radius: 2px;
    overflow: hidden;
}

#layer-study .study-plan-detail .plan-progress-fill {
    height: 100%;
    background: #111111;
    border-radius: 2px;
    transition: width 0.4s ease;
}

#layer-study .study-plan-detail .plan-detail-meta {
    font-size: 12px;
    color: #999999;
    margin-bottom: 14px;
    line-height: 1.8;
}

#layer-study .study-plan-detail .plan-detail-actions {
    display: flex;
    gap: 8px;
    padding-top: 14px;
    border-top: 1px solid #F5F5F5;
}

#layer-study .study-plan-detail .plan-detail-actions button {
    flex: 1;
    padding: 10px;
    border: none;
    border-radius: 10px;
    font-size: 13px;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.15s ease;
}

#layer-study .study-plan-detail .plan-detail-actions button.primary {
    background: #111111;
    color: #FFFFFF;
}

#layer-study .study-plan-detail .plan-detail-actions button.primary:active {
    background: #333333;
}

#layer-study .study-plan-detail .plan-detail-actions button.secondary {
    background: #F5F5F5;
    color: #666666;
}

#layer-study .study-plan-detail .plan-detail-actions button.secondary:active {
    background: #EEEEEE;
}

#layer-study .study-plan-detail .plan-detail-actions button.danger {
    background: #F5F5F5;
    color: #999999;
}

/* ====== 随堂测试 ====== */
#layer-study .study-quiz-area {
    background: #FFFFFF;
    border-radius: 16px;
    padding: 24px 20px;
    border: 1px solid #EEEEEE;
}

#layer-study .study-quiz-counter {
    font-size: 12px;
    color: #999999;
    margin-bottom: 16px;
    font-weight: 500;
    letter-spacing: 0.5px;
}

#layer-study .study-quiz-question-text {
    font-size: 16px;
    font-weight: 500;
    color: #111111;
    line-height: 1.7;
    margin-bottom: 20px;
    letter-spacing: -0.2px;
}

#layer-study .study-quiz-option {
    padding: 14px 16px;
    border: 1.5px solid #EEEEEE;
    border-radius: 12px;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 12px;
    cursor: pointer;
    transition: all 0.2s ease;
}

#layer-study .study-quiz-option:hover {
    border-color: #CCCCCC;
    background: #FAFAFA;
}

#layer-study .study-quiz-option:active {
    transform: scale(0.99);
}

#layer-study .study-quiz-option.correct {
    border-color: #111111;
    background: #F5F5F5;
}

#layer-study .study-quiz-option.wrong {
    border-color: #CCCCCC;
    background: #FAFAFA;
    opacity: 0.7;
}

#layer-study .study-quiz-option-label {
    width: 26px;
    height: 26px;
    border-radius: 50%;
    border: 2px solid #DDDDDD;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: 600;
    color: #999999;
    flex-shrink: 0;
    transition: all 0.2s ease;
}

#layer-study .study-quiz-option.correct .study-quiz-option-label {
    background: #111111;
    border-color: #111111;
    color: #FFFFFF;
}

#layer-study .study-quiz-option.wrong .study-quiz-option-label {
    background: #CCCCCC;
    border-color: #CCCCCC;
    color: #FFFFFF;
}

#layer-study .study-quiz-score {
    text-align: center;
    padding: 20px 0;
}

#layer-study .study-quiz-score .score-num {
    font-size: 56px;
    font-weight: 200;
    color: #111111;
    letter-spacing: -3px;
    line-height: 1;
}

#layer-study .study-quiz-score .score-label {
    font-size: 13px;
    color: #999999;
    margin-top: 8px;
    font-weight: 400;
    letter-spacing: 1px;
    text-transform: uppercase;
}

/* Quiz Actions Bar */
#layer-study .study-quiz-actions-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: 20px;
    padding-top: 16px;
    border-top: 1px solid #F0F0F0;
}

#layer-study .study-collect-btn {
    padding: 8px 16px;
    border: 1px solid #EEEEEE;
    background: #FFFFFF;
    border-radius: 8px;
    font-size: 13px;
    color: #666666;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.15s ease;
}

#layer-study .study-collect-btn:hover {
    border-color: #CCCCCC;
}

#layer-study .study-collect-btn:active {
    background: #F5F5F5;
}

#layer-study .study-collect-btn.collected {
    color: #999999;
    border-color: #F0F0F0;
}

#layer-study .study-next-btn {
    padding: 8px 20px;
    background: #111111;
    color: #FFFFFF;
    border: none;
    border-radius: 8px;
    font-size: 13px;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.15s ease;
}

#layer-study .study-next-btn:active {
    background: #333333;
}

/* ====== 收藏题库 ====== */
#layer-study .study-fav-filter-bar {
    display: flex;
    gap: 0;
    padding: 0 16px;
    background: #FFFFFF;
    border-bottom: 1px solid #EEEEEE;
}

#layer-study .study-fav-filter {
    padding: 12px 18px;
    font-size: 13px;
    color: #999999;
    cursor: pointer;
    font-weight: 500;
    border-bottom: 2px solid transparent;
    transition: all 0.2s ease;
}

#layer-study .study-fav-filter:hover {
    color: #666666;
}

#layer-study .study-fav-filter.active {
    color: #111111;
    font-weight: 600;
    border-bottom-color: #111111;
    background: transparent;
}

#layer-study .study-fav-filter:active {
    background: transparent;
}

#layer-study .study-fav-card {
    background: #FFFFFF;
    border-radius: 14px;
    padding: 16px 18px;
    margin-bottom: 10px;
    border: 1px solid #EEEEEE;
    transition: all 0.2s ease;
}

#layer-study .study-fav-card:hover {
    border-color: #DDDDDD;
}

#layer-study .study-fav-stem {
    font-size: 14px;
    font-weight: 500;
    color: #111111;
    line-height: 1.6;
    margin-bottom: 8px;
}

#layer-study .study-fav-meta {
    font-size: 11px;
    color: #BBBBBB;
    margin-bottom: 10px;
    letter-spacing: 0.2px;
}

#layer-study .study-fav-actions {
    display: flex;
    gap: 4px;
    padding-top: 10px;
    border-top: 1px solid #F5F5F5;
}

#layer-study .study-fav-actions button {
    background: none;
    border: none;
    padding: 6px 12px;
    font-size: 12px;
    color: #999999;
    cursor: pointer;
    border-radius: 6px;
    font-weight: 500;
    transition: all 0.15s ease;
}

#layer-study .study-fav-actions button:hover {
    background: #F5F5F5;
    color: #666666;
}

#layer-study .study-fav-actions button:active {
    color: #111111;
    background: #EEEEEE;
}

/* ====== 网课功能 ====== */
#layer-study .study-lecture-msgs {
    display: flex;
    flex-direction: column;
    gap: 12px;
    min-height: 200px;
    padding-bottom: 80px;
}

#layer-study .study-lecture-msg {
    max-width: 82%;
    padding: 12px 16px;
    border-radius: 14px;
    font-size: 14px;
    line-height: 1.7;
    animation: msgFadeIn 0.3s ease;
}

@keyframes msgFadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

#layer-study .study-lecture-msg.teacher {
    align-self: flex-start;
    background: #FFFFFF;
    border: 1px solid #EEEEEE;
    color: #222222;
    border-bottom-left-radius: 4px;
}

#layer-study .study-lecture-msg.student {
    align-self: flex-end;
    background: #111111;
    color: #FFFFFF;
    border-bottom-right-radius: 4px;
}

#layer-study .study-lecture-msg.system {
    align-self: center;
    background: transparent;
    color: #999999;
    font-size: 12px;
    padding: 8px 16px;
    text-align: center;
    max-width: 90%;
}

#layer-study .study-lecture-msg.quiz-inline {
    align-self: center;
    max-width: 92%;
    background: #FAFAFA;
    border: 1.5px solid #E5E5E5;
    color: #222222;
    border-radius: 14px;
}

/* ====== 网课输入栏 ====== */
#layer-study .study-lecture-input-bar {
    position: absolute;
    bottom: 52px;
    left: 0;
    right: 0;
    display: flex;
    gap: 8px;
    padding: 12px 16px;
    background: #FFFFFF;
    border-top: 1px solid #EEEEEE;
    align-items: center;
    z-index: 50;
}

#layer-study .study-lecture-input-bar input {
    flex: 1;
    /* [FIX-网课按钮溢出v1] flex项默认min-width:auto会撑破容器，导致最右按钮溢出屏幕 */
    min-width: 0;
    padding: 10px 16px;
    border: 1.5px solid #EEEEEE;
    border-radius: 10px;
    font-size: 14px;
    background: #FAFAFA;
    outline: none;
    color: #111111;
    transition: border-color 0.2s ease;
}

#layer-study .study-lecture-input-bar input:focus {
    border-color: #111111;
    background: #FFFFFF;
}

#layer-study .study-lecture-input-bar input::placeholder {
    color: #CCCCCC;
}

#layer-study .study-lecture-input-bar button {
    padding: 10px 18px;
    background: #111111;
    color: #FFFFFF;
    border: none;
    border-radius: 10px;
    font-size: 13px;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.15s ease;
    white-space: nowrap;
    /* [FIX-网课按钮溢出v1] 按钮不参与收缩，保持完整可点 */
    flex-shrink: 0;
}

#layer-study .study-lecture-input-bar button:active {
    background: #333333;
    transform: scale(0.96);
}

/* ====== 老师选择 ====== */
#layer-study .study-teacher-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 14px;
    border: 1.5px solid #EEEEEE;
    border-radius: 12px;
    margin-bottom: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
    touch-action: manipulation;
}

#layer-study .study-teacher-item:hover {
    border-color: #DDDDDD;
    background: #FAFAFA;
}

#layer-study .study-teacher-item.selected {
    border-color: #111111;
    background: #F5F5F5;
}

#layer-study .study-teacher-item img {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    object-fit: cover;
}

#layer-study .study-teacher-item .teacher-name {
    font-size: 14px;
    font-weight: 600;
    color: #111111;
}

#layer-study .study-teacher-item .teacher-persona {
    font-size: 12px;
    color: #999999;
    margin-top: 2px;
}

/* ====== 资料选择（网课） ====== */
#layer-study .study-material-select {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 14px;
    border: 1.5px solid #EEEEEE;
    border-radius: 12px;
    margin-bottom: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
    touch-action: manipulation;
}

#layer-study .study-material-select:hover {
    border-color: #DDDDDD;
    background: #FAFAFA;
}

#layer-study .study-material-select.selected {
    border-color: #111111;
    background: #F5F5F5;
}

#layer-study .study-material-select i {
    color: #333333;
    font-size: 18px;
    flex-shrink: 0;
}

.sms-info {
    flex: 1;
    min-width: 0;
}

.sms-name {
    font-size: 14px;
    font-weight: 500;
    color: #111111;
}

.sms-type {
    font-size: 12px;
    color: #999999;
    margin-top: 2px;
}

/* ====== Section Title ====== */
#layer-study .study-section-title {
    font-size: 13px;
    font-weight: 600;
    color: #333333;
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
    letter-spacing: 0.2px;
}

#layer-study .study-section-title i {
    color: #666666;
    font-size: 13px;
}

/* ====== Primary Button ====== */
#layer-study .study-btn-primary {
    padding: 14px 24px;
    background: #111111;
    color: #FFFFFF;
    border: none;
    border-radius: 12px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    letter-spacing: 0.2px;
    touch-action: manipulation;
    -webkit-tap-highlight-color: rgba(0,0,0,0.05);
    position: relative;
    z-index: 1;
}

#layer-study .study-btn-primary:hover {
    background: #222222;
}

#layer-study .study-btn-primary:active {
    background: #333333;
    transform: scale(0.98);
}

#layer-study .study-btn-primary:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

/* ====== Modal Primary Button ====== */
#layer-study .study-modal-btn-primary,
.study-modal-btn-primary {
    background: #111111 !important;
    color: #FFFFFF !important;
    font-weight: 500;
}

/* ====== Empty Hint ====== */
#layer-study .study-empty-hint {
    text-align: center;
    padding: 48px 24px;
    color: #BBBBBB;
    font-size: 14px;
    line-height: 1.8;
}

/* ====== 学习弹窗提问（聊天界面） ====== */
.study-quiz-popup {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.4);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    z-index: 9000;
    display: flex;
    align-items: center;
    justify-content: center;
    animation: studyPopupFadeIn 0.3s ease;
}

@keyframes studyPopupFadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.study-quiz-popup-content {
    background: #FFFFFF;
    border-radius: 20px;
    width: 88%;
    max-width: 380px;
    max-height: 75vh;
    /* [FIX-结果框裁切v1] 内容过高时整体可滚动，避免底部结果框/操作栏被裁切 */
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    animation: studyPopupSlideUp 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
    box-shadow: 0 20px 60px rgba(0,0,0,0.15);
}

@keyframes studyPopupSlideUp {
    from { transform: translateY(30px) scale(0.95); opacity: 0; }
    to { transform: translateY(0) scale(1); opacity: 1; }
}

.study-quiz-popup-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 18px;
    border-bottom: 1px solid #F0F0F0;
    font-size: 15px;
    font-weight: 600;
    color: #111111;
}

.study-quiz-popup-header i {
    margin-right: 6px;
    color: #333333;
}

.study-quiz-popup-close {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    background: #F5F5F5;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: #999999;
    transition: all 0.15s ease;
}

.study-quiz-popup-close:hover {
    background: #EEEEEE;
    color: #333333;
}

.study-quiz-popup-question {
    padding: 18px 20px;
    font-size: 15px;
    line-height: 1.7;
    color: #222222;
    font-weight: 500;
}

.study-quiz-popup-options {
    padding: 0 18px 12px;
}

.study-quiz-popup-options .study-quiz-option {
    padding: 12px 14px;
    border: 1.5px solid #EEEEEE;
    border-radius: 10px;
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    transition: all 0.15s ease;
    font-size: 14px;
    color: #333333;
}

.study-quiz-popup-options .study-quiz-option:hover {
    border-color: #CCCCCC;
}

.study-quiz-popup-options .study-quiz-option.correct {
    border-color: #111111;
    background: #F5F5F5;
}

.study-quiz-popup-options .study-quiz-option.wrong {
    border-color: #CCCCCC;
    opacity: 0.6;
}

.study-quiz-popup-input {
    padding: 12px 18px;
    display: flex;
    gap: 8px;
}

.study-quiz-popup-input input {
    flex: 1;
    padding: 10px 14px;
    border: 1.5px solid #EEEEEE;
    border-radius: 10px;
    font-size: 14px;
    outline: none;
    color: #111111;
    transition: border-color 0.2s;
}

.study-quiz-popup-input input:focus {
    border-color: #111111;
}

.study-quiz-popup-input button {
    padding: 10px 18px;
    background: #111111;
    color: #FFFFFF;
    border: none;
    border-radius: 10px;
    font-size: 13px;
    cursor: pointer;
    font-weight: 500;
}

.study-quiz-popup-result {
    /* [FIX-结果框裁切v1] 加外边距与圆角，避免紧贴边缘显得"瘪"，内容完整展示 */
    margin: 4px 18px 0;
    padding: 12px 14px;
    font-size: 14px;
    line-height: 1.6;
    border-radius: 10px;
    word-break: break-word;
}

.study-quiz-popup-result.correct {
    background: #F5F5F5;
    color: #111111;
}

.study-quiz-popup-result.wrong {
    background: #FAFAFA;
    color: #666666;
}

.study-quiz-popup-actions {
    display: flex;
    gap: 8px;
    padding: 12px 18px 18px;
}

.study-close-btn {
    padding: 10px 18px;
    border: 1px solid #EEEEEE;
    background: #FFFFFF;
    border-radius: 10px;
    font-size: 13px;
    color: #666666;
    cursor: pointer;
    font-weight: 500;
    flex: 1;
    transition: all 0.15s ease;
}

.study-close-btn:hover {
    background: #F5F5F5;
}

.study-close-btn:active {
    background: #EEEEEE;
}

/* ====== 陪伴详情面板 ====== */
.companion-detail-overlay {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.4);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    z-index: 8000;
    display: flex;
    align-items: center;
    justify-content: center;
}

.companion-detail-panel {
    background: #FFFFFF;
    border-radius: 20px;
    width: 92%;
    max-width: 400px;
    max-height: 80vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    animation: cdSlideUp 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
    box-shadow: 0 20px 60px rgba(0,0,0,0.12);
}

@keyframes cdSlideUp {
    from { transform: translateY(30px) scale(0.95); opacity: 0; }
    to { transform: translateY(0) scale(1); opacity: 1; }
}

.companion-detail-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 18px 20px;
    border-bottom: 1px solid #F0F0F0;
    font-size: 16px;
    font-weight: 700;
    color: #111111;
}

.companion-detail-header button {
    background: #F5F5F5;
    border: none;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.15s ease;
}

.companion-detail-header button:hover {
    background: #EEEEEE;
}

.companion-detail-header button:active {
    background: #E5E5E5;
}

.companion-detail-header button svg {
    display: block;
}

.companion-detail-body {
    overflow-y: auto;
    padding: 20px;
    -webkit-overflow-scrolling: touch;
}

/* Companion Detail Internal Styles */
.cd-summary {
    text-align: center;
    padding: 16px 0 20px;
}

.cd-summary-title {
    font-size: 12px;
    color: #999999;
    letter-spacing: 1px;
    text-transform: uppercase;
    margin-bottom: 8px;
}

.cd-summary-time {
    font-size: 36px;
    font-weight: 200;
    color: #111111;
    letter-spacing: -2px;
    margin-bottom: 16px;
}

.cd-summary-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
}

.cd-summary-item {
    background: #F5F5F5;
    border-radius: 10px;
    padding: 12px 8px;
    text-align: center;
}

.cd-summary-item .val {
    font-size: 15px;
    font-weight: 600;
    color: #111111;
}

.cd-summary-item .lbl {
    font-size: 10px;
    color: #999999;
    margin-top: 4px;
}

.cd-section-title {
    font-size: 13px;
    font-weight: 700;
    color: #111111;
    margin-top: 20px;
    margin-bottom: 12px;
    letter-spacing: 0.2px;
}

.cd-milestones {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.cd-milestone-tag {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 12px;
    background: #F5F5F5;
    border-radius: 8px;
    font-size: 13px;
    color: #111111;
}

.cd-milestone-tag.locked {
    opacity: 0.4;
    color: #999999;
}

.cd-chart {
    margin-top: 16px;
}

.cd-chart-bars {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    height: 90px;
    padding-top: 10px;
}

.cd-chart-bar-wrap {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    flex: 1;
}

.cd-chart-bar {
    width: 8px;
    background: #E5E5E5;
    border-radius: 4px 4px 0 0;
    transition: height 0.4s ease;
}

.cd-chart-bar-wrap:last-child .cd-chart-bar {
    background: #111111;
}

.cd-chart-label {
    font-size: 10px;
    color: #BBBBBB;
    font-weight: 500;
}

.cd-chart-bar-wrap:last-child .cd-chart-label {
    color: #111111;
    font-weight: 600;
}

/* Companion Contact List */
.cd-contact-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.cd-contact-card {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 12px;
    background: #F5F5F5;
    border-radius: 10px;
}

.cd-contact-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    object-fit: cover;
}

.cd-contact-avatar-placeholder {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: #E5E5E5;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: 600;
    color: #666666;
}

.cd-contact-info {
    flex: 1;
    min-width: 0;
}

.cd-contact-name {
    font-size: 13px;
    font-weight: 600;
    color: #111111;
}

.cd-contact-stats {
    display: flex;
    gap: 8px;
    margin-top: 2px;
}

.cd-contact-stats span {
    font-size: 11px;
    color: #999999;
}

.cd-contact-bar-outer {
    height: 3px;
    background: #E5E5E5;
    border-radius: 2px;
    margin-top: 6px;
    overflow: hidden;
}

.cd-contact-bar-inner {
    height: 100%;
    background: #111111;
    border-radius: 2px;
    transition: width 0.4s ease;
}

/* ====== Modal 弹窗覆盖样式 ====== */
#modal-study-plan,
#modal-study-upload,
#modal-study-settings {
    background: rgba(0,0,0,0.4) !important;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

#modal-study-plan > div,
#modal-study-upload > div,
#modal-study-settings > div {
    border-radius: 20px !important;
    box-shadow: 0 20px 60px rgba(0,0,0,0.12) !important;
    animation: studyModalIn 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes studyModalIn {
    from { transform: translateY(20px) scale(0.95); opacity: 0; }
    to { transform: translateY(0) scale(1); opacity: 1; }
}

/* Modal input styling */
#modal-study-plan input,
#modal-study-plan select,
#modal-study-upload input,
#modal-study-upload select,
#modal-study-upload textarea,
#modal-study-settings input[type="number"] {
    border: 1.5px solid #EEEEEE !important;
    border-radius: 10px !important;
    font-size: 14px !important;
    padding: 12px 14px !important;
    transition: border-color 0.2s ease !important;
    outline: none !important;
    color: #111111 !important;
    background: #FAFAFA !important;
}

#modal-study-plan input:focus,
#modal-study-plan select:focus,
#modal-study-upload input:focus,
#modal-study-upload select:focus,
#modal-study-upload textarea:focus,
#modal-study-settings input[type="number"]:focus {
    border-color: #111111 !important;
    background: #FFFFFF !important;
}

/* ====== Switch Toggle 开关样式 ====== */
#layer-study .switch,
#modal-study-settings .switch {
    position: relative;
    width: 44px;
    height: 24px;
}

#layer-study .switch input,
#modal-study-settings .switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

#layer-study .switch .slider,
#modal-study-settings .switch .slider {
    position: absolute;
    inset: 0;
    background: #E5E5E5;
    border-radius: 12px;
    transition: all 0.3s ease;
    cursor: pointer;
}

#layer-study .switch .slider::before,
#modal-study-settings .switch .slider::before {
    content: '';
    position: absolute;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: #FFFFFF;
    bottom: 3px;
    left: 3px;
    transition: all 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    box-shadow: 0 1px 3px rgba(0,0,0,0.15);
}

#layer-study .switch input:checked + .slider,
#modal-study-settings .switch input:checked + .slider {
    background: #111111;
}

#layer-study .switch input:checked + .slider::before,
#modal-study-settings .switch input:checked + .slider::before {
    transform: translateX(20px);
}

/* ====== 文件上传区域 ====== */
#modal-study-upload button[onclick*="study-file-input"] {
    border: 2px dashed #DDDDDD !important;
    background: #FAFAFA !important;
    border-radius: 12px !important;
    color: #999999 !important;
    transition: all 0.2s ease !important;
}

#modal-study-upload button[onclick*="study-file-input"]:hover {
    border-color: #BBBBBB !important;
    color: #666666 !important;
}

/* ====== Practice Bar (收藏题专项练习) ====== */
#study-fav-practice-bar {
    background: #FFFFFF;
    border-top: 1px solid #EEEEEE !important;
}

#study-fav-practice-bar button {
    background: #111111 !important;
    border-radius: 12px !important;
    font-weight: 500 !important;
    transition: all 0.15s ease !important;
}

#study-fav-practice-bar button:active {
    background: #333333 !important;
    transform: scale(0.98);
}

/* ====== 网课会话列表 ====== */
.sl-sessions-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
}

.sl-sessions-title {
    font-size: 15px;
    font-weight: 700;
    color: #111111;
    letter-spacing: -0.2px;
}

.sl-new-btn {
    padding: 7px 16px !important;
    font-size: 13px !important;
    border-radius: 20px !important;
}

.sl-session-card {
    display: flex;
    align-items: center;
    padding: 14px 16px;
    margin-bottom: 10px;
    background: #FFFFFF;
    border-radius: 14px;
    cursor: pointer;
    border: 1px solid #EEEEEE;
    transition: all 0.2s ease;
}

.sl-session-card:hover {
    border-color: #DDDDDD;
    box-shadow: 0 2px 8px rgba(0,0,0,0.03);
}

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

.sl-session-card.active {
    border-left: 3px solid #111111;
}

.sl-session-avatar {
    width: 42px;
    height: 42px;
    border-radius: 50%;
    object-fit: cover;
    margin-right: 14px;
    flex-shrink: 0;
}

.sl-session-info {
    flex: 1;
    overflow: hidden;
    min-width: 0;
}

.sl-session-title-row {
    display: flex;
    align-items: center;
    gap: 8px;
}

.sl-session-name {
    font-weight: 600;
    font-size: 14px;
    color: #111111;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.sl-session-badge {
    font-size: 10px;
    background: #111111;
    color: #FFFFFF;
    padding: 2px 8px;
    border-radius: 10px;
    font-weight: 500;
    white-space: nowrap;
    flex-shrink: 0;
}

.sl-session-preview {
    font-size: 12px;
    color: #999999;
    margin-top: 3px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.sl-session-meta {
    font-size: 11px;
    color: #BBBBBB;
    margin-top: 3px;
}

.sl-session-actions {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    margin-left: 10px;
}

.sl-session-arrow {
    color: #CCCCCC;
    font-size: 12px;
}

.sl-session-delete {
    color: #CCCCCC;
    font-size: 11px;
    cursor: pointer;
    transition: color 0.15s ease;
}

.sl-session-delete:hover {
    color: #999999;
}

/* ====== 课程目录（大目录 → 小节） ====== */
.sl-toc-header {
    margin-bottom: 14px;
}
.sl-toc-course {
    display: flex;
    align-items: center;
    padding: 16px;
    background: #111111;
    border-radius: 16px;
    color: #FFFFFF;
}
.sl-toc-course-icon {
    font-size: 24px;
    margin-right: 14px;
    opacity: 0.9;
}
.sl-toc-course-info { flex: 1; min-width: 0; }
.sl-toc-course-name {
    font-size: 16px;
    font-weight: 700;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.sl-toc-course-meta {
    font-size: 12px;
    opacity: 0.7;
    margin-top: 4px;
}
.sl-toc-list { display: flex; flex-direction: column; gap: 8px; }
.sl-toc-item {
    display: flex;
    align-items: center;
    padding: 13px 14px;
    background: #FFFFFF;
    border: 1px solid #EEEEEE;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.15s ease;
}
.sl-toc-item:hover { border-color: #DDDDDD; box-shadow: 0 2px 8px rgba(0,0,0,0.03); }
.sl-toc-item:active { transform: scale(0.99); }
.sl-toc-item.done { background: #FAFAFA; }
.sl-toc-item.active { border-left: 3px solid #111111; }
.sl-toc-num {
    width: 26px;
    height: 26px;
    border-radius: 50%;
    background: #F0F0F0;
    color: #666666;
    font-size: 12px;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 12px;
    flex-shrink: 0;
}
.sl-toc-item.done .sl-toc-num { background: #111111; color: #FFFFFF; }
.sl-toc-item.active .sl-toc-num { background: #111111; color: #FFFFFF; }
.sl-toc-item-info { flex: 1; min-width: 0; }
.sl-toc-item-title {
    font-size: 14px;
    font-weight: 600;
    color: #111111;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.sl-toc-item-meta { font-size: 11px; color: #AAAAAA; margin-top: 3px; }
.sl-toc-arrow { color: #CCCCCC; font-size: 13px; margin-left: 8px; flex-shrink: 0; }
.sl-toc-done { color: #111111 !important; }

/* ====== 小节对话顶部返回目录条 ====== */
.sl-section-bar {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 12px;
    background: #FAFAFA;
    border-bottom: 1px solid #EEEEEE;
    position: sticky;
    top: 0;
    z-index: 5;
}
.sl-section-back {
    font-size: 13px;
    color: #666666;
    cursor: pointer;
    white-space: nowrap;
    flex-shrink: 0;
}
.sl-section-back:active { opacity: 0.6; }
.sl-section-bar-name {
    font-size: 13px;
    font-weight: 600;
    color: #111111;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* ====== 计划进度文字 ====== */
#layer-study .plan-progress-text {
    font-size: 13px;
    color: #666666;
    white-space: nowrap;
    font-weight: 500;
}

/* ====== 收藏题专项练习栏 ====== */
.study-fav-practice-bar {
    padding: 12px 16px;
    background: #FFFFFF;
    border-top: 1px solid #EEEEEE;
}

/* ====== 删除按钮 ====== */
#layer-study .mat-delete-btn {
    color: #CCCCCC !important;
}

#layer-study .mat-delete-btn:hover {
    color: #999999 !important;
}

/* ====== 测试结果详情 ====== */
.sq-result-detail {
    text-align: center;
    margin: 20px 0;
}

.sq-result-text {
    font-size: 14px;
    color: #666666;
    font-weight: 400;
}

/* ====== 计划状态标签 ====== */
#layer-study .study-plan-detail .plan-detail-status.active {
    background: #111111;
    color: #FFFFFF;
}

#layer-study .study-plan-detail .plan-detail-status.paused {
    background: #F0F0F0;
    color: #999999;
}

#layer-study .study-plan-detail .plan-detail-status.completed {
    background: #F5F5F5;
    color: #BBBBBB;
}

/* ====== 收藏题详情样式 ====== */
.sf-correct {
    color: #111111;
    font-size: 12px;
    font-weight: 600;
}

.sf-wrong {
    color: #BBBBBB;
    font-size: 12px;
    font-weight: 500;
}

.sf-answer-info {
    font-size: 12px;
    color: #999999;
    margin-top: 6px;
}

.sf-note {
    font-size: 12px;
    color: #666666;
    margin-top: 6px;
    padding: 6px 10px;
    background: #F5F5F5;
    border-radius: 6px;
    line-height: 1.5;
}

.sf-delete-btn {
    color: #CCCCCC !important;
}

.sf-delete-btn:hover {
    color: #999999 !important;
}

/* ====== 响应式微调 ====== */
@media (max-width: 360px) {
    #layer-study .sc-stat-val {
        font-size: 20px;
    }
    
    #layer-study .sc-tools-grid {
        gap: 8px;
    }
    
    #layer-study .sc-tool-icon {
        width: 40px;
        height: 40px;
        font-size: 16px;
    }
}

/* ====== 动画优化 - 减少动画偏好 ====== */
@media (prefers-reduced-motion: reduce) {
    #layer-study *,
    .study-quiz-popup *,
    .companion-detail-panel {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
}

/* ========================================================================== */
/* ==== 监督系统视觉统一 - 嵌入学习App时使用学习App极简黑白风 ====================== */
/* ==== 作用域：#supervise-content-embedded（不影响独立 #layer-supervise） ======== */
/* ========================================================================== */

/* ---- 整体容器 ---- */
#supervise-content-embedded { background: #FAFAFA; height: 100%; }
#supervise-content-embedded .sv-home {
    background: #FAFAFA !important;
    height: 100%;
}

/* ---- 顶部 Header ---- */
#supervise-content-embedded .sv-home-header {
    background: #FFFFFF !important;
    color: #111111 !important;
    padding: 14px 16px 20px !important;
    border-radius: 0 !important;
    border-bottom: 1px solid #EEEEEE;
}
#supervise-content-embedded .sv-home-header::before,
#supervise-content-embedded .sv-home-header::after {
    display: none !important;
}
#supervise-content-embedded .sv-header-top > div:nth-child(2) {
    color: #111111 !important;
    font-size: 17px !important;
    font-weight: 600 !important;
}
#supervise-content-embedded .sv-header-back {
    background: transparent !important;
    color: #111 !important;
    width: 36px; height: 36px;
}
#supervise-content-embedded .sv-header-back i { color: #111 !important; }
#supervise-content-embedded .sv-header-action-btn {
    background: #F5F5F5 !important;
    backdrop-filter: none !important;
    color: #111 !important;
}
#supervise-content-embedded .sv-header-action-btn i { color: #111 !important; }
#supervise-content-embedded .sv-header-action-btn:active { background: #EEEEEE !important; }

/* Header 里的"今日专注 XX 分钟" */
#supervise-content-embedded .sv-home-header > div:nth-child(2) {
    margin-top: 14px !important;
}
#supervise-content-embedded .sv-home-header > div:nth-child(2) > div:first-child {
    font-size: 13px !important;
    font-weight: 500 !important;
    color: #666 !important;
    letter-spacing: 0.3px;
}
#supervise-content-embedded .sv-home-header > div:nth-child(2) > div:last-child > span:first-child {
    font-size: 34px !important;
    font-weight: 300 !important;
    color: #111 !important;
}
#supervise-content-embedded .sv-home-header > div:nth-child(2) > div:last-child > span:nth-child(2) {
    color: #999 !important;
    opacity: 1 !important;
}
#supervise-content-embedded .sv-streak-badge {
    background: #111 !important;
    color: #fff !important;
    box-shadow: none !important;
    font-weight: 500 !important;
}

/* ---- 顶部统计卡行 ---- */
#supervise-content-embedded .sv-stats-row {
    margin-top: 0 !important;
    padding: 12px 16px 0 !important;
    gap: 8px !important;
}
#supervise-content-embedded .sv-stat-card {
    background: #FFFFFF !important;
    border-radius: 12px !important;
    border: 1px solid #EEEEEE !important;
    box-shadow: none !important;
    padding: 14px 10px !important;
}
#supervise-content-embedded .sv-stat-value {
    background: none !important;
    -webkit-background-clip: initial !important;
    -webkit-text-fill-color: #111 !important;
    color: #111 !important;
    font-size: 22px !important;
    font-weight: 600 !important;
}
#supervise-content-embedded .sv-stat-label {
    color: #999 !important;
    font-size: 11px !important;
}

/* ---- 今日进度 / 分区卡片（统一为 sc-card 风） ---- */
#supervise-content-embedded .sv-today-section {
    padding: 14px 16px !important;
}
#supervise-content-embedded .sv-section-title {
    color: #111 !important;
    font-size: 15px !important;
    font-weight: 600 !important;
}
#supervise-content-embedded .sv-section-more {
    color: #666 !important;
    font-size: 12px !important;
}
#supervise-content-embedded .sv-section-more:hover { color: #111 !important; }

#supervise-content-embedded .sv-today-progress {
    background: #FFFFFF !important;
    border: 1px solid #EEEEEE !important;
    border-radius: 14px !important;
    box-shadow: none !important;
    padding: 16px !important;
}
#supervise-content-embedded .sv-progress-title { color: #666 !important; }
#supervise-content-embedded .sv-progress-count {
    color: #111 !important;
    font-weight: 600 !important;
}
#supervise-content-embedded .sv-progress-bar-bg {
    background: #F0F0F0 !important;
    height: 3px !important;
    border-radius: 2px !important;
}
#supervise-content-embedded .sv-progress-bar-fill {
    background: #111 !important;
    border-radius: 2px !important;
}
#supervise-content-embedded .sv-progress-detail { color: #999 !important; }

/* ---- 本周柱状图 ---- */
#supervise-content-embedded .sv-weekly-chart { border: none !important; padding: 0 !important; background: transparent !important; }
#supervise-content-embedded .sv-chart-bar {
    background: #E5E5E5 !important;
    border-radius: 3px 3px 0 0 !important;
}
#supervise-content-embedded .sv-chart-bar.today {
    background: #111 !important;
}
#supervise-content-embedded .sv-chart-label { color: #999 !important; }

/* ---- 监督人卡片 ---- */
#supervise-content-embedded .sv-supervisor-avatar {
    border: 2px solid #EEEEEE !important;
    box-shadow: none !important;
}
#supervise-content-embedded .sv-supervisor-add {
    background: #F5F5F5 !important;
    border: 2px dashed #DDDDDD !important;
    color: #999 !important;
}
#supervise-content-embedded .sv-supervisor-add:active {
    border-color: #111 !important;
    color: #111 !important;
}
#supervise-content-embedded .sv-supervisor-name { color: #666 !important; }

/* ---- 任务卡片 ---- */
#supervise-content-embedded .sv-tasks-section { padding: 0 16px 16px !important; }
#supervise-content-embedded .sv-task-card {
    background: #FFFFFF !important;
    border: 1px solid #EEEEEE !important;
    border-radius: 12px !important;
    box-shadow: none !important;
    padding: 14px !important;
}
#supervise-content-embedded .sv-task-card:hover { border-color: #DDDDDD !important; }
#supervise-content-embedded .sv-task-icon {
    background: #F5F5F5 !important;
    border-radius: 10px !important;
    width: 44px !important;
    height: 44px !important;
    font-size: 20px !important;
}
/* 分类图标统一浅灰底（保留 emoji 色彩） */
#supervise-content-embedded .sv-task-icon.study,
#supervise-content-embedded .sv-task-icon.work,
#supervise-content-embedded .sv-task-icon.exercise,
#supervise-content-embedded .sv-task-icon.read,
#supervise-content-embedded .sv-task-icon.code,
#supervise-content-embedded .sv-task-icon.art,
#supervise-content-embedded .sv-task-icon.meditate,
#supervise-content-embedded .sv-task-icon.other {
    background: #F5F5F5 !important;
}
#supervise-content-embedded .sv-task-name {
    color: #111 !important;
    font-weight: 600 !important;
}
#supervise-content-embedded .sv-task-meta { color: #999 !important; }
#supervise-content-embedded .sv-task-progress-mini {
    background: #F0F0F0 !important;
}
#supervise-content-embedded .sv-task-progress-mini-fill {
    background: #111 !important;
}
#supervise-content-embedded .sv-task-play-btn {
    background: #111 !important;
    box-shadow: none !important;
    width: 38px !important;
    height: 38px !important;
}
#supervise-content-embedded .sv-task-play-btn:active { background: #333 !important; }
#supervise-content-embedded .sv-task-play-btn i { color: #fff !important; }

/* ---- 空状态 ---- */
#supervise-content-embedded .sv-empty-icon { opacity: 0.25 !important; }
#supervise-content-embedded .sv-empty-text { color: #999 !important; }
#supervise-content-embedded .sv-empty-btn {
    background: #111 !important;
    box-shadow: none !important;
    border-radius: 10px !important;
}
#supervise-content-embedded .sv-empty-btn:active { background: #333 !important; }

/* ---- 浮动添加按钮 — [FIX-弹性保护带] ---- */
#supervise-content-embedded .sv-fab {
    background: #111 !important;
    box-shadow: 0 4px 16px rgba(0,0,0,0.15) !important;
    bottom: calc(var(--guard-bottom, 12px) + 8px) !important;
    right: var(--guard-right, 20px) !important;
}
#supervise-content-embedded .sv-fab:active { background: #333 !important; }
#supervise-content-embedded .sv-fab i { color: #fff !important; }

/* ---- 内部 Tabs（首页/历史/统计切换） ---- */
#supervise-content-embedded .sv-tabs {
    background: #FFFFFF !important;
    border-top: 1px solid #EEEEEE !important;
}
#supervise-content-embedded .sv-tab { color: #BBB !important; }
#supervise-content-embedded .sv-tab.active { color: #111 !important; font-weight: 600 !important; }
#supervise-content-embedded .sv-tab.active::after {
    background: #111 !important;
    width: 20px !important;
    height: 2px !important;
}

/* ---- 历史列表 ---- */
#supervise-content-embedded .sv-history-item {
    border-bottom: 1px solid #F0F0F0 !important;
    padding: 14px 16px !important;
}
#supervise-content-embedded .sv-history-icon {
    background: #F5F5F5 !important;
    border-radius: 10px !important;
}
#supervise-content-embedded .sv-history-title { color: #111 !important; }
#supervise-content-embedded .sv-history-time { color: #999 !important; }
#supervise-content-embedded .sv-history-duration {
    color: #111 !important;
    font-weight: 600 !important;
}

/* ---- 数据统计页 ---- */
#supervise-content-embedded .sv-stats-page {
    background: #FAFAFA !important;
    padding: 16px !important;
}
#supervise-content-embedded .sv-stats-card {
    background: #FFFFFF !important;
    border: 1px solid #EEEEEE !important;
    border-radius: 14px !important;
    box-shadow: none !important;
    padding: 16px !important;
}
#supervise-content-embedded .sv-stats-card-title { color: #111 !important; }
#supervise-content-embedded .sv-stats-card-title i { color: #666 !important; }
#supervise-content-embedded .sv-stats-period-tab {
    background: #F5F5F5 !important;
    color: #999 !important;
    border-radius: 14px !important;
}
#supervise-content-embedded .sv-stats-period-tab.active {
    background: #111 !important;
    color: #fff !important;
    box-shadow: none !important;
}
#supervise-content-embedded .sv-stats-big-number {
    background: none !important;
    -webkit-background-clip: initial !important;
    -webkit-text-fill-color: #111 !important;
    color: #111 !important;
    font-weight: 600 !important;
}
#supervise-content-embedded .sv-stats-big-label { color: #999 !important; }
#supervise-content-embedded .sv-stats-mini-card {
    background: #F8F8F8 !important;
    border-radius: 10px !important;
}
#supervise-content-embedded .sv-stats-mini-val {
    color: #111 !important;
    font-weight: 600 !important;
}
#supervise-content-embedded .sv-stats-mini-label { color: #999 !important; }
#supervise-content-embedded .sv-stats-bar {
    background: #E5E5E5 !important;
    border-radius: 3px 3px 0 0 !important;
}
#supervise-content-embedded .sv-stats-bar.highlight {
    background: #111 !important;
}
#supervise-content-embedded .sv-stats-bar-label { color: #999 !important; }
#supervise-content-embedded .sv-stats-bar-val { color: #111 !important; }
#supervise-content-embedded .sv-stats-completion-text { color: #111 !important; }

/* ---- 专注计时页（嵌入版） ---- */
#supervise-content-embedded .sv-focus-screen {
    background: #FAFAFA !important;
}
#supervise-content-embedded .sv-focus-task-name { color: #111 !important; }
#supervise-content-embedded .sv-focus-time { color: #111 !important; font-weight: 300 !important; }
#supervise-content-embedded .sv-focus-btn {
    background: #111 !important;
    color: #fff !important;
    box-shadow: none !important;
    border: none !important;
}
#supervise-content-embedded .sv-focus-btn:active { background: #333 !important; }
#supervise-content-embedded .sv-focus-btn-stop {
    background: #F5F5F5 !important;
    color: #111 !important;
    box-shadow: none !important;
}
#supervise-content-embedded .sv-focus-btn-stop:active { background: #EEEEEE !important; }

/* ---- 心情日记（嵌入版） ---- */
#supervise-content-embedded .sv-mood-card {
    background: #FFFFFF !important;
    border: 1px solid #EEEEEE !important;
    border-radius: 12px !important;
    box-shadow: none !important;
}
#supervise-content-embedded .sv-mood-time { color: #999 !important; }
#supervise-content-embedded .sv-mood-task { color: #111 !important; }
#supervise-content-embedded .sv-mood-text {
    background: #F8F8F8 !important;
    color: #333 !important;
    border-radius: 10px !important;
}
#supervise-content-embedded .sv-mood-picker-item:hover,
#supervise-content-embedded .sv-mood-picker-item.active {
    background: #F5F5F5 !important;
    border-color: #111 !important;
}
#supervise-content-embedded .sv-mood-input-area textarea {
    background: #FAFAFA !important;
    border: 1px solid #EEEEEE !important;
    color: #111 !important;
    border-radius: 10px !important;
}
#supervise-content-embedded .sv-mood-input-area textarea:focus {
    border-color: #111 !important;
}
#supervise-content-embedded .sv-mood-input-area textarea::placeholder { color: #BBB !important; }
#supervise-content-embedded .sv-supervisor-reply {
    background: #F8F8F8 !important;
    border-left: 2px solid #111 !important;
    border-radius: 10px !important;
}
#supervise-content-embedded .sv-supervisor-reply-name { color: #111 !important; }
#supervise-content-embedded .sv-supervisor-reply-text { color: #666 !important; }

/* ---- 任务详情内容 ---- */
#supervise-content-embedded .sv-detail-name { color: #111 !important; }
#supervise-content-embedded .sv-detail-category { color: #999 !important; }
#supervise-content-embedded .sv-detail-progress-pct { color: #111 !important; }
#supervise-content-embedded .sv-detail-bar-bg { background: #F0F0F0 !important; }
#supervise-content-embedded .sv-detail-bar-fill {
    background: #111 !important;
}
#supervise-content-embedded .sv-detail-stat {
    background: #F8F8F8 !important;
    border-radius: 10px !important;
}
#supervise-content-embedded .sv-detail-stat-val { color: #111 !important; }
#supervise-content-embedded .sv-detail-stat-label { color: #999 !important; }
#supervise-content-embedded .sv-detail-btn-primary {
    background: #111 !important;
    box-shadow: none !important;
    border-radius: 10px !important;
}
#supervise-content-embedded .sv-detail-btn-secondary {
    background: #F5F5F5 !important;
    color: #111 !important;
    border-radius: 10px !important;
}
#supervise-content-embedded .sv-detail-btn-danger {
    background: #F5F5F5 !important;
    color: #333 !important;
    border: 1px solid #EEEEEE !important;
    border-radius: 10px !important;
}

/* ---- 开关 ---- */
#supervise-content-embedded .sv-toggle input:checked + .sv-toggle-slider {
    background: #111 !important;
}

/* ---- 鼓励气泡 ---- */
#supervise-content-embedded .sv-encourage-bubble,
#supervise-content-embedded #sv-encourage-bubble {
    background: #F8F8F8 !important;
    border-radius: 12px !important;
}

/* ---- 完成弹层（嵌入时） ---- */
#supervise-content-embedded .sv-completion-card,
#supervise-content-embedded .sv-complete-card {
    background: #FFFFFF !important;
    border-radius: 16px !important;
}
#supervise-content-embedded .sv-completion-card .completion-title,
#supervise-content-embedded .sv-complete-title { color: #111 !important; }
#supervise-content-embedded .sv-completion-card .completion-msg,
#supervise-content-embedded .sv-complete-msg { color: #666 !important; }
#supervise-content-embedded .sv-completion-card .completion-stat .cs-val,
#supervise-content-embedded .sv-complete-stat-val { color: #111 !important; }
#supervise-content-embedded .sv-completion-card .completion-btn,
#supervise-content-embedded .sv-complete-btn {
    background: #111 !important;
    box-shadow: none !important;
    border-radius: 10px !important;
}

/* ====== 深色模式预留（如果系统偏好暗色） ====== */
/* 保持纯黑白灰不变，这是设计意图 */