/* 基础样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #6155f5;
    --purple-dark: #6b46c1;
    --purple-medium: #8A5CF5;
    --purple-light: #A78BFA;
    --purple-bg: #F3F4F6;
    --secondary-color: #50C878;
    --danger-color: #E74C3C;
    --warning-color: #F39C12;
    --yellow-accent: #FCD34D;
    --pink-accent: #F9A8D4;
    --green-accent: #86EFAC;
    --text-color: #333;
    --text-light: #666;
    --bg-color: #F5F7FA;
    --white: #FFFFFF;
    --border-color: #E1E8ED;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.15);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    color: var(--text-color);
    background-color: var(--bg-color);
    line-height: 1.6;
}

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    width: 100%;
    height: 70px;
    background: var(--white);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-container {

    width: 100%;
    /*max-width: 1200px;*/
    height: 100%;
    margin: 0 auto;
    padding: 0.5rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand a {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
    text-decoration: none;
}

.nav-menu {
    display: flex;
    gap: 1.5rem;
}

.nav-menu a {
    color: var(--text-color);
    text-decoration: none;
    transition: color 0.3s;
}

.nav-menu a:hover {
    color: var(--primary-color);
}

/* 主内容区 */
.main-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

/* 登录页面 */
.login-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.login-container {
    width: 100%;
    max-width: 400px;
    padding: 2rem;
}

.login-box {
    background: var(--white);
    border-radius: 12px;
    padding: 2.5rem;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
}

.login-box h1 {
    text-align: center;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.subtitle {
    text-align: center;
    color: var(--text-light);
    margin-bottom: 2rem;
}

.login-form {
    margin-bottom: 1.5rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-color);
    font-weight: 500;
}

.form-group input {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

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

.login-info {
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
    font-size: 0.875rem;
    color: var(--text-light);
    text-align: center;
}

.login-info p {
    margin-bottom: 0.25rem;
}

/* 按钮 */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 6px;
    font-size: 1rem;
    font-weight: 500;
    text-align: center;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.3s;
}

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

.btn-primary:hover {
    background: #357ABD;
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.btn-secondary {
    background: var(--text-light);
    color: var(--white);
}

.btn-block {
    width: 100%;
}

/* 提示框 */
.alert {
    padding: 1rem;
    border-radius: 6px;
    margin-bottom: 1rem;
}

.alert-error {
    background: #FEE;
    color: var(--danger-color);
    border: 1px solid #FCC;
}

/* 仪表板 */
.dashboard h1 {
    margin-bottom: 2rem;
    color: var(--text-color);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: var(--white);
    border-radius: 12px;
    padding: 1.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    box-shadow: var(--shadow);
    transition: transform 0.3s;
}

.stat-card:hover {
    transform: translateY(-4px);
}

.stat-icon {
    font-size: 2.5rem;
}

.stat-value {
    font-size: 2rem;
    font-weight: bold;
    color: var(--primary-color);
}

.stat-label {
    color: var(--text-light);
    font-size: 0.875rem;
}

.dashboard-sections {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.section {
    background: var(--white);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: var(--shadow);
}

.section h2 {
    margin-bottom: 1rem;
    color: var(--text-color);
    font-size: 1.25rem;
}

.class-list,
.task-list {
    list-style: none;
}

.class-list li,
.task-list li {
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.class-list li:last-child,
.task-list li:last-child {
    border-bottom: none;
}

.due-date {
    color: var(--text-light);
    font-size: 0.875rem;
}

.empty-state {
    text-align: center;
    color: var(--text-light);
    padding: 2rem;
}

.action-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
}

/* 其他样式 */
.profile-section {
    background: var(--white);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: var(--shadow);
}

.profile-card {
    text-align: center;
    margin-bottom: 2rem;
}

.profile-avatar {
    width: 120px;
    height: 120px;
    margin: 0 auto 1rem;
    border-radius: 50%;
    overflow: hidden;
    background: var(--primary-color);
    display: flex;
    align-items: center;
    justify-content: center;
}

.profile-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.avatar-placeholder {
    font-size: 3rem;
    color: var(--white);
}

.user-email {
    color: var(--text-light);
    margin-top: 0.5rem;
}

.profile-info dl {
    display: grid;
    grid-template-columns: 150px 1fr;
    gap: 1rem;
    margin-top: 1rem;
}

.profile-info dt {
    font-weight: 600;
    color: var(--text-color);
}

.profile-info dd {
    color: var(--text-light);
}

.schedule-list,
.materials-list {
    list-style: none;
}

.schedule-item,
.material-item {
    background: var(--white);
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 1rem;
    box-shadow: var(--shadow);
    display: flex;
    gap: 1.5rem;
}

.schedule-time {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
    min-width: 80px;
}

.schedule-info h3 {
    margin-bottom: 0.5rem;
}

.task-item {
    background: var(--white);
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 1rem;
    box-shadow: var(--shadow);
}

.task-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.task-status {
    padding: 0.25rem 0.75rem;
    border-radius: 4px;
    font-size: 0.875rem;
}

.status-pending {
    background: #FFF3CD;
    color: #856404;
}

.status-completed {
    background: #D4EDDA;
    color: #155724;
}

.classes-grid,
.courses-grid,
.readings-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 1.5rem;
}

.class-card,
.course-card,
.reading-card {
    background: var(--white);
    border-radius: 8px;
    padding: 1.5rem;
    box-shadow: var(--shadow);
}

.reading-level {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: var(--primary-color);
    color: var(--white);
    border-radius: 4px;
    font-size: 0.875rem;
    margin: 0.5rem 0;
}

.reading-preview {
    color: var(--text-light);
    margin: 1rem 0;
}

.data-table {
    width: 100%;
    background: var(--white);
    border-radius: 15px;
    padding: 15px;
    overflow: hidden;
    box-shadow: var(--shadow);
}

.data-table thead {
    background: var(--primary-color);
    color: var(--white);
}

.data-table th,
.data-table td {
    padding: 1rem;
    text-align: left;
}

.data-table tbody tr {
    border-bottom: 1px solid var(--border-color);
}

.data-table tbody tr:last-child {
    border-bottom: none;
}

.notifications-list {
    list-style: none;
}

.notification-item {
    background: var(--white);
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 1rem;
    box-shadow: var(--shadow);
}

/* 学员中心新设计 */
.student-dashboard {
    position: absolute;
    top:0;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    min-height: calc(100vh - 60px);
    background: var(--purple-bg);
    margin-top: 0;
}

.main-content .student-dashboard {
    margin: 0;
    padding: 0;
    max-width: 100%;
}

/* 左侧边栏 */
.sidebar {
    position: fixed;
    left: 0;
    top: 70px;
    bottom: 0;
    z-index: 1;
    width: 280px;
    background: linear-gradient(180deg, #8B5CF6 0%, #6B46C1 100%);
    padding: 2rem 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 2rem;
    /*position: sticky;*/
    /*top: 60px;*/
    height: calc(100vh - 60px);
    overflow-y: auto;
    flex-shrink: 0;
}

.sidebar-header {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1rem;
}

.logo-icon {
    width: 60px;
    height: 60px;
    background: rgba(255, 255, 255, 0.2);
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
}

.sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    color: rgba(255, 255, 255, 0.9);
    text-decoration: none;
    border-radius: 12px;
    transition: all 0.3s;
    font-weight: 500;
}

.nav-item:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--white);
}

.nav-item.active {
    background: rgba(255, 255, 255, 0.2);
    color: var(--white);
}

.nav-icon {
    font-size: 1.5rem;
    width: 24px;
    text-align: center;
}

.nav-text {
    flex: 1;
}

/* 促销卡片 */
.promo-card {
    background: var(--purple-dark);
    border-radius: 16px;
    padding: 1.5rem;
    color: var(--white);
    margin-top: auto;
    position: relative;
    overflow: hidden;
}

.promo-content {
    position: relative;
    z-index: 2;
}

.promo-content h3 {
    font-size: 1.1rem;
    margin-bottom: 1rem;
    font-weight: 600;
}

.promo-btn {
    background: var(--yellow-accent);
    color: var(--purple-dark);
    border: none;
    border-radius: 50px;
    padding: 0.75rem 1.5rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.3s;
}

.promo-btn:hover {
    transform: scale(1.05);
}

.promo-illustration {
    position: absolute;
    bottom: 0;
    right: 0;
    opacity: 0.3;
    font-size: 3rem;
}

.promo-char {
    font-size: 4rem;
    line-height: 1;
}

.promo-items {
    font-size: 1.5rem;
    margin-top: -1rem;
}

/* 主内容区 */
.main-content-area {
    position: absolute;
    left:  280px;
    top: 70px;
    right: 0px;
    bottom: 0px;
    z-index: 1;
    flex: 1;
    padding: 2rem;
    overflow-y: auto;

}

.content-header h1 {
    font-size: 2rem;
    color: var(--purple-dark);
    margin-bottom: 1.5rem;
    font-weight: 700;
}

/* 课程筛选 */
.course-filters {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 50px;
    background: var(--white);
    color: var(--purple-dark);
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s;
    box-shadow: var(--shadow);
}

.filter-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.filter-btn.active {
    background: var(--purple-dark);
    color: var(--white);
}

.filter-btn {
    text-decoration: none;
    display: inline-block;
}

a.filter-btn {
    text-decoration: none;
}

/* =========================
   教材中心（管理员）- 首页UI
   ========================= */
.materials-page .content-header {
    margin-bottom: 1.25rem;
}

.materials-page-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1.5rem;
    margin-bottom: 0.75rem;
}

.materials-page-title {
    font-size: 2rem;
    color: var(--purple-dark);
    font-weight: 800;
    letter-spacing: 0.5px;
    line-height: 1.1;
}

.materials-tabs {
    display: flex;
    gap: 0.75rem;
    align-items: center;
    flex-wrap: wrap;
}

.materials-tabs .filter-btn {
    padding: 0.6rem 1.25rem;
    border-radius: 999px;
    box-shadow: 0 6px 18px rgba(17, 24, 39, 0.06);
}

.materials-divider {
    height: 1px;
    background: rgba(17, 24, 39, 0.10);
    border-radius: 1px;
    margin: 0.75rem 0 1.25rem;
}

.materials-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    flex-wrap: wrap;
    margin-bottom: 1.5rem;
}

.materials-toolbar-left,
.materials-toolbar-right {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.materials-toolbar-left .filter-btn,
.materials-toolbar-right .filter-btn {
    padding: 0.6rem 1.25rem;
    border-radius: 10px;
    box-shadow: none;
}

.materials-btn-primary {
    background: var(--purple-dark);
    color: var(--white);
    border: 1px solid transparent;
}

.materials-btn-ghost {
    background: var(--white);
    color: var(--purple-dark);
    border: 1px solid rgba(17, 24, 39, 0.10);
}

.materials-search {
    position: relative;
    width: 320px;
    max-width: 100%;
}

.materials-search input[type="text"] {
    width: 100%;
    height: 40px;
    padding: 0 42px 0 14px;
    border-radius: 10px;
    border: 1px solid rgba(17, 24, 39, 0.10);
    background: var(--white);
    outline: none;
    font-size: 0.95rem;
}

.materials-search input[type="text"]::placeholder {
    color: rgba(107, 114, 128, 0.9);
}

.materials-search button {
    position: absolute;
    right: 8px;
    top: 50%;
    transform: translateY(-50%);
    border: none;
    background: transparent;
    cursor: pointer;
    padding: 6px;
    color: rgba(107, 114, 128, 1);
}

.materials-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.75rem;
}

@media (max-width: 1100px) {
    .materials-grid {
        grid-template-columns: 1fr;
    }
}

.materials-group-card {
    background: var(--white);
    border-radius: 22px;
    box-shadow: 0 14px 30px rgba(17, 24, 39, 0.08);
    padding: 1.25rem 1.25rem 1.1rem;
    display: grid;
    grid-template-columns: 240px 1fr;
    gap: 1.25rem;
    align-items: center;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.materials-group-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 18px 38px rgba(17, 24, 39, 0.10);
}

.materials-group-cover {
    width: 240px;
    aspect-ratio: 1 / 1;
    height: auto;
    border-radius: 18px;
    overflow: hidden;
    background: rgba(139, 92, 246, 0.12);
    flex-shrink: 0;
}

.materials-group-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.materials-group-body {
    min-width: 0;
}

.materials-group-title {
    margin: 0 0 0.5rem 0;
    color: var(--purple-dark);
    font-size: 1.6rem;
    font-weight: 800;
    letter-spacing: 0.2px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.materials-group-desc {
    margin: 0;
    color: rgba(107, 114, 128, 1);
    font-size: 0.95rem;
    line-height: 1.4;
    min-height: 1.4em;
}

.materials-group-footer {
    margin-top: 1.25rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.materials-group-count {
    color: rgba(17, 24, 39, 0.85);
    font-size: 0.95rem;
}

.materials-group-actions {
    display: flex;
    gap: 1.25rem;
    align-items: center;
}

.materials-link {
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 600;
}

.materials-link-edit {
    color: var(--purple-dark);
}

.materials-link-delete {
    color: rgba(107, 114, 128, 1);
}

/* 教材中心 - 右侧抽屉（编辑课本） */
.materials-drawer-overlay {
    position: fixed;
    inset: 0;
    background: rgba(17, 24, 39, 0.25);
    backdrop-filter: blur(1px);
    z-index: 2000;
    opacity: 0;
    pointer-events: none;
    transition: opacity 220ms ease;
}

.materials-drawer {
    position: fixed;
    top: 70px; /* 顶部导航高度 */
    right: 0;
    bottom: 0;
    width: min(720px, 92vw);
    background: rgba(255, 255, 255, 0.92);
    border-top-left-radius: 22px;
    border-bottom-left-radius: 22px;
    box-shadow: -18px 0 40px rgba(17, 24, 39, 0.18);
    z-index: 2001;
    transform: translateX(110%);
    transition: transform 260ms cubic-bezier(0.22, 1, 0.36, 1);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.materials-drawer.is-open {
    transform: translateX(0);
}

.materials-drawer-overlay.is-open {
    opacity: 1;
    pointer-events: auto;
}

/* 教材组弹窗样式 */
.group-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2010;
    opacity: 0;
    pointer-events: none;
    transition: opacity 220ms ease;
}

.group-modal.is-open {
    opacity: 1;
    pointer-events: auto;
}

.group-modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(17, 24, 39, 0.5);
    backdrop-filter: blur(4px);
}

.group-modal-content {
    position: relative;
    background: var(--white);
    border-radius: 16px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow: hidden;
    z-index: 2011;
    transform: scale(0.95);
    transition: transform 260ms cubic-bezier(0.22, 1, 0.36, 1);
}

.group-modal.is-open .group-modal-content {
    transform: scale(1);
}

.group-modal-header {
    padding: 1.5rem 2rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.group-modal-header h3 {
    margin: 0;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--purple-dark);
}

.group-modal-close {
    background: none;
    border: none;
    font-size: 2rem;
    color: var(--text-light);
    cursor: pointer;
    padding: 0;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    transition: all 0.3s;
    line-height: 1;
}

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

.group-modal-body {
    padding: 2rem;
    overflow-y: auto;
    max-height: calc(90vh - 180px);
}

.group-form-row {
    margin-bottom: 1.5rem;
}

.group-form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--text-color);
    font-size: 0.95rem;
}

.group-form-input,
.group-form-textarea {
    width: 100%;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    padding: 0.75rem 1rem;
    font-size: 0.95rem;
    outline: none;
    background: var(--white);
    transition: border-color 0.3s;
    box-sizing: border-box;
}

.group-form-input:focus,
.group-form-textarea:focus {
    border-color: var(--primary-color);
}

.group-form-textarea {
    resize: vertical;
    min-height: 100px;
    font-family: inherit;
}

.group-modal-error {
    color: #c33;
    font-size: 0.875rem;
    margin-top: 0.5rem;
}

.group-modal-footer {
    padding: 1.5rem 2rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
}

.group-modal-btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s;
}

.group-modal-btn.cancel {
    background: var(--white);
    color: var(--text-color);
    border: 2px solid var(--border-color);
}

.group-modal-btn.cancel:hover {
    background: var(--purple-bg);
    border-color: var(--text-light);
}

.group-modal-btn.save {
    background: linear-gradient(135deg, var(--primary-color), var(--purple-dark));
    color: white;
}

.group-modal-btn.save:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(124, 58, 237, 0.3);
}

.materials-drawer-header {
    padding: 1.75rem 2rem 1.25rem;
    text-align: center;
    color: var(--purple-dark);
    font-size: 2rem;
    font-weight: 800;
    letter-spacing: 0.5px;
}

.materials-drawer-body {
    padding: 0 2rem 1.5rem;
    overflow: auto;
}

.materials-form-row {
    display: grid;
    grid-template-columns: 110px 1fr;
    gap: 1rem;
    align-items: start;
    margin-bottom: 1.1rem;
}

.materials-form-label {
    color: rgba(17, 24, 39, 0.9);
    font-weight: 700;
    padding-top: 0.55rem;
    text-align: left;
}

.materials-required {
    color: #c33;
    margin-right: 6px;
}

.materials-input,
.materials-textarea {
    width: 100%;
    border: 1px solid rgba(17, 24, 39, 0.10);
    border-radius: 10px;
    padding: 0.7rem 0.9rem;
    font-size: 0.95rem;
    outline: none;
    background: rgba(255, 255, 255, 0.95);
}

.materials-textarea {
    resize: none;
    height: 120px;
}

.materials-cover-row {
    display: flex;
    gap: 1rem;
    align-items: flex-start;
}

.materials-upload-btn {
    background: var(--purple-dark);
    color: var(--white);
    border: none;
    border-radius: 10px;
    padding: 0.6rem 1.1rem;
    font-weight: 700;
    cursor: pointer;
    height: 40px;
}

.materials-cover-hint {
    color: rgba(107, 114, 128, 1);
    font-size: 0.9rem;
    padding-top: 0.45rem;
    white-space: nowrap;
}

.materials-cover-gallery {
    display: flex;
    gap: 0.6rem;
    align-items: center;
    margin-top: 0.75rem;
}

.materials-cover-thumb {
    width: 70px;
    height: 70px;
    border-radius: 14px;
    overflow: hidden;
    background: rgba(139, 92, 246, 0.10);
    border: 2px solid transparent;
    flex-shrink: 0;
    cursor: pointer;
}

.materials-cover-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.materials-cover-thumb.is-active {
    border-color: var(--purple-dark);
}

.materials-drawer-footer {
    padding: 1.1rem 2rem 1.4rem;
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-top: auto;
}

.materials-footer-btn {
    min-width: 96px;
    height: 40px;
    border-radius: 8px;
    font-weight: 700;
    cursor: pointer;
    border: 1px solid rgba(17, 24, 39, 0.10);
    background: var(--white);
}

.materials-footer-btn.save {
    background: #3CC07A;
    color: var(--white);
    border-color: transparent;
}

.materials-footer-btn.publish {
    background: #7C3AED;
    color: var(--white);
    border-color: transparent;
}

/* =========================
   教材中心 - 课本详情（组内教材）
   ========================= */
.group-materials-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.25rem;
}

.group-materials-back {
    height: 36px;
    padding: 0 14px;
    border-radius: 10px;
    border: 1px solid rgba(17, 24, 39, 0.10);
    background: var(--white);
    color: var(--purple-dark);
    font-weight: 700;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 8px 18px rgba(17, 24, 39, 0.06);
}

.group-materials-title {
    font-size: 1.9rem;
    font-weight: 800;
    color: var(--purple-dark);
    letter-spacing: 0.3px;
}

.group-materials-toolbar {
    background: var(--white);
    border-radius: 14px;
    padding: 1rem 1.25rem;
    box-shadow: 0 10px 22px rgba(17, 24, 39, 0.06);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    flex-wrap: wrap;
    margin-bottom: 1.25rem;
}

.group-materials-toolbar-left {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.group-materials-search {
    position: relative;
    width: 240px;
    max-width: 100%;
}

.group-materials-search input {
    width: 100%;
    height: 38px;
    padding: 0 40px 0 12px;
    border-radius: 10px;
    border: 1px solid rgba(17, 24, 39, 0.10);
    outline: none;
    background: var(--white);
}

.group-materials-search .icon {
    position: absolute;
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
    color: rgba(107, 114, 128, 1);
}

.group-materials-hint {
    color: rgba(107, 114, 128, 1);
    font-size: 0.95rem;
    font-weight: 600;
}

.group-materials-toolbar-right {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.gm-btn {
    height: 38px;
    padding: 0 14px;
    border-radius: 10px;
    font-weight: 700;
    cursor: pointer;
    border: 1px solid rgba(17, 24, 39, 0.10);
    background: var(--white);
    color: rgba(17, 24, 39, 0.85);
    box-shadow: 0 8px 18px rgba(17, 24, 39, 0.05);
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    text-decoration: none;
}

.gm-btn.primary {
    background: #7C3AED;
    color: var(--white);
    border-color: transparent;
}

.gm-btn.dropdown::after {
    content: "▼";
    font-size: 0.75rem;
    margin-left: 6px;
    opacity: 0.7;
}

.group-materials-table-head {
    display: grid;
    grid-template-columns: 80px 90px 1fr 160px;
    gap: 1rem;
    padding: 0.9rem 1.25rem;
    color: rgba(17, 24, 39, 0.75);
    font-weight: 800;
    font-size: 0.95rem;
}

.group-materials-list {
    display: flex;
    flex-direction: column;
    gap: 1.1rem;
}

.gm-row {
    background: var(--white);
    border-radius: 14px;
    box-shadow: 0 12px 26px rgba(17, 24, 39, 0.06);
    padding: 1.05rem 1.25rem;
    display: grid;
    grid-template-columns: 80px 90px 1fr 160px;
    gap: 1rem;
    align-items: center;
    transition: all 0.3s;
    cursor: default;
}

.gm-row[draggable="true"] {
    cursor: move;
}

.gm-row.dragging {
    opacity: 0.5;
    transform: scale(0.98);
    box-shadow: 0 16px 32px rgba(17, 24, 39, 0.12);
}

.gm-row.drag-over {
    border-top: 3px solid rgba(124, 58, 237, 0.8);
    padding-top: calc(1.05rem - 3px);
}

.gm-sort {
    display: flex;
    align-items: center;
    gap: 0.65rem;
    color: rgba(17, 24, 39, 0.9);
    font-weight: 700;
}

.gm-drag {
    color: rgba(124, 58, 237, 0.8);
    font-weight: 900;
    cursor: grab;
    user-select: none;
    width: 18px;
    text-align: center;
    transition: color 0.3s;
}

.gm-drag:active {
    cursor: grabbing;
    color: rgba(124, 58, 237, 1);
}

.gm-row:hover .gm-drag {
    color: rgba(124, 58, 237, 1);
}

.gm-sort-number {
    font-size: 0.875rem;
    font-weight: 500;
    color: rgba(17, 24, 39, 0.9);
}

.gm-cover {
    width: 56px;
    aspect-ratio: 1 / 1;
    border-radius: 14px;
    overflow: hidden;
    background: rgba(139, 92, 246, 0.12);
    border: 2px solid rgba(124, 58, 237, 0.35);
}

.gm-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.gm-name {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    min-width: 0;
}

.gm-name-text {
    font-weight: 800;
    color: rgba(17, 24, 39, 0.92);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.gm-tag {
    height: 24px;
    padding: 0 10px;
    border-radius: 999px;
    background: rgba(124, 58, 237, 0.12);
    color: rgba(124, 58, 237, 1);
    font-weight: 800;
    font-size: 0.85rem;
    display: inline-flex;
    align-items: center;
}

.gm-info {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    border: 2px solid rgba(124, 58, 237, 0.55);
    color: rgba(124, 58, 237, 0.9);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: 900;
}

.gm-actions {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 0.9rem;
    font-weight: 800;
}

.gm-action {
    color: rgba(124, 58, 237, 1);
    text-decoration: none;
    font-weight: 800;
    white-space: nowrap;
}

.gm-action.more::after {
    content: "▼";
    font-size: 0.75rem;
    margin-left: 6px;
    opacity: 0.7;
}

@media (max-width: 980px) {
    .group-materials-table-head { display: none; }
    .gm-row {
        grid-template-columns: 1fr;
        gap: 0.85rem;
        align-items: start;
    }
    .gm-actions { justify-content: flex-start; }
}

/* 课本详情 - 编辑课文信息抽屉（编辑封面） */
.lesson-drawer .materials-drawer-header {
    padding-top: 2rem;
    font-size: 2.1rem;
}

.lesson-cover-preview {
    margin-top: 0.9rem;
    width: 260px;
    max-width: 100%;
    aspect-ratio: 1 / 1;
    border-radius: 16px;
    overflow: hidden;
    background: rgba(139, 92, 246, 0.10);
    border: 1px solid rgba(17, 24, 39, 0.08);
}

.lesson-cover-preview img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.lesson-drawer-footer {
    justify-content: flex-end;
}

.materials-footer-btn.go {
    min-width: 170px;
}

/* 课程卡片网格 */
.course-cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.course-card {
    background: var(--purple-dark);
    border-radius: 20px;
    padding: 2rem;
    color: var(--white);
    position: relative;
    overflow: hidden;
    min-height: 230px;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-lg);
    transition: transform 0.3s;
}

.course-card:hover {
    transform: translateY(-5px);
}

.course-card-purple {
    background: linear-gradient(135deg, #c392ff 0%, #7b8dff 100%);
    /*background: linear-gradient(135deg, #6B46C1 0%, #8B5CF6 100%);*/
}

.course-card-yellow {
    background: linear-gradient(135deg, #FCD34D 0%, #FBBF24 100%);
    color: var(--purple-dark);
}

.course-lock {
    position: absolute;
    top: 1rem;
    right: 1rem;
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
}

.course-content {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.course-content h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    font-weight: 700;
}

.course-instructor {
    opacity: 0.9;
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
}

.course-illustration {
    font-size: 4rem;
    text-align: center;
    margin: 1rem 0;
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
}

.course-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: auto;
    padding-top: 1rem;
    border-top: 1px solid rgba(255, 255, 255, 0.2);
}

.course-duration,
.course-level {
    font-size: 0.875rem;
    opacity: 0.9;
}

/* 学习资源 */
.resources-section {
    margin-bottom: 3rem;
}

.resources-section h2 {
    font-size: 1.5rem;
    color: var(--purple-dark);
    margin-bottom: 1.5rem;
    font-weight: 700;
}

.resources-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
}

.resource-card {
    background: var(--white);
    border-radius: 16px;
    padding: 1.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    box-shadow: var(--shadow);
    transition: transform 0.3s;
}

.resource-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.resource-pink {
    background: linear-gradient(135deg, #F9A8D4 0%, #F472B6 100%);
    color: var(--white);
}

.resource-purple {
    background: linear-gradient(135deg, #A78BFA 0%, #8B5CF6 100%);
    color: var(--white);
}

.resource-green {
    background: linear-gradient(135deg, #86EFAC 0%, #4ADE80 100%);
    color: var(--purple-dark);
}

.resource-icon {
    font-size: 2.5rem;
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 12px;
}

.resource-content h4 {
    font-size: 1rem;
    margin-bottom: 0.25rem;
    font-weight: 600;
}

.resource-content p {
    font-size: 0.875rem;
    opacity: 0.9;
}

/* 统计卡片 */
.stats-section {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-bottom: 24px;
}

.stat-card-modern {
    background: var(--white);
    border-radius: 16px;
    padding: 1.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    box-shadow: var(--shadow);
    transition: transform 0.3s;
}

.stat-card-modern:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.stat-icon-modern {
    font-size: 2.5rem;
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #A78BFA 0%, #8B5CF6 100%);
    border-radius: 12px;
}

.stat-value-modern {
    font-size: 2rem;
    font-weight: 700;
    color: var(--purple-dark);
}

.stat-label-modern {
    color: var(--text-light);
    font-size: 0.875rem;
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .student-dashboard {
        flex-direction: column;
    }
    
    .sidebar {
        width: 100%;
        height: auto;
        position: relative;
        top: 0;
        flex-direction: row;
        padding: 1rem;
    }
    
    .sidebar-nav {
        flex-direction: row;
        flex-wrap: wrap;
        flex: 1;
    }
    
    .nav-item {
        flex: 1;
        min-width: 120px;
    }
    
    .promo-card {
        display: none;
    }
}

@media (max-width: 768px) {
    .main-content {
        padding: 1rem;
    }
    
    .main-content-area {
        padding: 1rem;
    }
    
    .content-header h1 {
        font-size: 1.5rem;
    }
    
    .course-cards-grid {
        grid-template-columns: 1fr;
    }
    
    .resources-grid {
        grid-template-columns: 1fr;
    }
    
    .stats-section {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .dashboard-sections {
        grid-template-columns: 1fr;
    }
    
    .nav-container {
        padding: 1rem;
    }
    
    .nav-menu {
        gap: 1rem;
    }
    
    .profile-info dl {
        grid-template-columns: 1fr;
    }
    
    .schedule-item {
        flex-direction: column;
    }
    
    .classes-grid,
    .courses-grid,
    .readings-grid {
        grid-template-columns: 1fr;
    }
    
    .sidebar {
        flex-direction: column;
    }
    
    .sidebar-nav {
        flex-direction: column;
    }
    
    .nav-item {
        width: 100%;
    }
}

/* ============================================
   老师中心优化样式
   ============================================ */

/* 老师中心仪表板 */
.teacher-dashboard {
    padding-top: 1rem;
}

.dashboard-header {
    margin-bottom: 2rem;
}

.welcome-section h1 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-color);
    margin-bottom: 0.5rem;
}

.welcome-subtitle {
    color: var(--text-light);
    font-size: 0.95rem;
}

/* 统计卡片优化 */
.teacher-stats {
    margin-bottom: 2.5rem;
}

.stat-card {
    position: relative;
    overflow: hidden;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--purple-light));
    opacity: 0;
    transition: opacity 0.3s;
}

.stat-card:hover::before {
    opacity: 1;
}

.stat-card-primary {
    border-left: 4px solid var(--primary-color);
}

.stat-card-success {
    border-left: 4px solid var(--secondary-color);
}

.stat-card-warning {
    border-left: 4px solid var(--warning-color);
}

.stat-card-info {
    border-left: 4px solid var(--purple-dark);
}

.stat-icon-wrapper {
    width: 56px;
    height: 56px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(74, 144, 226, 0.1), rgba(167, 139, 250, 0.1));
}

.stat-card-primary .stat-icon-wrapper {
    background: linear-gradient(135deg, rgba(74, 144, 226, 0.15), rgba(74, 144, 226, 0.05));
    color: var(--primary-color);
}

.stat-card-success .stat-icon-wrapper {
    background: linear-gradient(135deg, rgba(80, 200, 120, 0.15), rgba(80, 200, 120, 0.05));
    color: var(--secondary-color);
}

.stat-card-warning .stat-icon-wrapper {
    background: linear-gradient(135deg, rgba(243, 156, 18, 0.15), rgba(243, 156, 18, 0.05));
    color: var(--warning-color);
}

.stat-card-info .stat-icon-wrapper {
    background: linear-gradient(135deg, rgba(107, 70, 193, 0.15), rgba(107, 70, 193, 0.05));
    color: var(--purple-dark);
}

.stat-icon {
    width: 28px;
    height: 28px;
}

.stat-trend {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    font-size: 0.75rem;
    color: var(--text-light);
    margin-top: 0.25rem;
}

.trend-up {
    color: var(--secondary-color);
}

/* 页面头部 */
.page-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 2px solid var(--border-color);
}

.page-title-section {
    flex: 1;
}

.page-title-section h1 {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-color);
    margin-bottom: 0.5rem;
}

.page-icon {
    width: 28px;
    height: 28px;
    color: var(--primary-color);
}

.page-subtitle {
    color: var(--text-light);
    font-size: 0.95rem;
}

.page-actions {
    display: flex;
    gap: 1rem;
}

/* 按钮优化 */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-size: 0.95rem;
    font-weight: 500;
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: all 0.3s;
}

.btn svg {
    width: 18px;
    height: 18px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--purple-dark));
    color: white;
    box-shadow: 0 4px 12px rgba(74, 144, 226, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(74, 144, 226, 0.4);
}

.btn-outline {
    background: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

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

.btn-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 8px;
    color: var(--text-light);
    transition: all 0.3s;
    text-decoration: none;
}

.btn-icon:hover {
    background: var(--purple-bg);
    color: var(--primary-color);
}

.btn-icon svg {
    width: 18px;
    height: 18px;
}

/* 空状态优化 */
.empty-state-modern {
    text-align: center;
    padding: 4rem 2rem;
    background: var(--white);
    border-radius: 16px;
    box-shadow: var(--shadow);
}

.empty-icon {
    width: 80px;
    height: 80px;
    color: var(--text-light);
    margin: 0 auto 1.5rem;
    opacity: 0.5;
}

.empty-state-modern p {
    font-size: 1.125rem;
    color: var(--text-color);
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.empty-hint {
    font-size: 0.95rem;
    color: var(--text-light);
    font-weight: normal;
}

/* 章节头部 */
.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.section-header h2 {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-color);
    margin: 0;
}

.section-icon {
    width: 24px;
    height: 24px;
    color: var(--primary-color);
}

.section-link {
    color: var(--primary-color);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    transition: color 0.3s;
}

.section-link:hover {
    color: var(--purple-dark);
}

/* 今日课程列表 */
.class-list-modern {
    list-style: none;
    padding: 0;
    margin: 0;
}

.class-item-modern {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.25rem;
    background: var(--purple-bg);
    border-radius: 12px;
    margin-bottom: 1rem;
    transition: all 0.3s;
}

.class-item-modern:hover {
    background: #E5E7EB;
    transform: translateX(4px);
}

.class-time-badge {
    min-width: 80px;
    text-align: center;
    padding: 0.75rem;
    background: linear-gradient(135deg, var(--primary-color), var(--purple-dark));
    color: white;
    border-radius: 10px;
    font-weight: 600;
}

.time-hour {
    font-size: 1rem;
    display: block;
}

.class-details {
    flex: 1;
}

.class-details h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 0.5rem;
}

.class-meta {
    font-size: 0.875rem;
    color: var(--text-light);
}

/* 快速操作 */
.quick-actions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
}

.quick-action-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 2rem 1.5rem;
    background: var(--white);
    border-radius: 16px;
    box-shadow: var(--shadow);
    text-decoration: none;
    color: var(--text-color);
    transition: all 0.3s;
}

.quick-action-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    color: var(--primary-color);
}

.quick-action-icon {
    width: 64px;
    height: 64px;
    border-radius: 16px;
    background: linear-gradient(135deg, rgba(74, 144, 226, 0.1), rgba(167, 139, 250, 0.1));
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.quick-action-icon svg {
    width: 32px;
    height: 32px;
}

.quick-action-card h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.quick-action-card p {
    font-size: 0.875rem;
    color: var(--text-light);
}

/* 学员卡片 */
.students-grid-modern {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.5rem;
}

.student-card-modern {
    display: flex;
    align-items: center;
    gap: 1.25rem;
    padding: 1.5rem;
    background: var(--white);
    border-radius: 16px;
    box-shadow: var(--shadow);
    transition: all 0.3s;
}

.student-card-modern:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.student-avatar {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), var(--purple-dark));
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 600;
    flex-shrink: 0;
}

.student-info {
    flex: 1;
}

.student-info h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 0.5rem;
}

.student-email {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--text-light);
    margin-bottom: 0.75rem;
}

.student-email svg {
    width: 16px;
    height: 16px;
}

.student-meta {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.meta-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.375rem 0.75rem;
    background: var(--purple-bg);
    border-radius: 6px;
    font-size: 0.8125rem;
    color: var(--text-color);
}

.meta-badge svg {
    width: 14px;
    height: 14px;
}

.student-actions {
    display: flex;
    gap: 0.5rem;
}

/* 班级卡片 */
.classes-grid-modern {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

.class-card-modern {
    padding: 1.5rem;
    background: var(--white);
    border-radius: 16px;
    box-shadow: var(--shadow);
    transition: all 0.3s;
}

.class-card-modern:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.class-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--border-color);
}

.class-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: linear-gradient(135deg, rgba(74, 144, 226, 0.1), rgba(167, 139, 250, 0.1));
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-color);
    flex-shrink: 0;
}

.class-icon svg {
    width: 24px;
    height: 24px;
}

.class-header h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-color);
    margin: 0;
}

.class-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.class-stat-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem;
    background: var(--purple-bg);
    border-radius: 10px;
}

.class-stat-item svg {
    width: 24px;
    height: 24px;
    color: var(--primary-color);
}

.stat-number {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-color);
    line-height: 1;
}

.stat-text {
    font-size: 0.8125rem;
    color: var(--text-light);
    margin-top: 0.25rem;
}

.class-actions {
    display: flex;
    gap: 0.75rem;
}

/* 课表 */
.schedule-container {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.schedule-day {
    background: var(--white);
    border-radius: 16px;
    padding: 1.5rem;
    box-shadow: var(--shadow);
}

.schedule-day-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--border-color);
}

.day-date {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.day-name {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: linear-gradient(135deg, var(--primary-color), var(--purple-dark));
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.125rem;
    font-weight: 600;
}

.day-number {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-color);
}

.day-count {
    font-size: 0.875rem;
    color: var(--text-light);
}

.schedule-list-modern {
    list-style: none;
    padding: 0;
    margin: 0;
}

.schedule-item-modern {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.25rem;
    background: var(--purple-bg);
    border-radius: 12px;
    margin-bottom: 1rem;
    transition: all 0.3s;
}

.schedule-item-modern:hover {
    background: #E5E7EB;
}

.schedule-time-modern {
    min-width: 80px;
    text-align: center;
}

.time-hour {
    font-size: 1rem;
    font-weight: 600;
    color: var(--primary-color);
}

.schedule-info-modern {
    flex: 1;
}

.schedule-info-modern h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 0.5rem;
}

.schedule-meta {
    font-size: 0.875rem;
    color: var(--text-light);
}

/* 任务列表 */
.tasks-container {
    background: var(--white);
    border-radius: 16px;
    padding: 1.5rem;
    box-shadow: var(--shadow);
}

.task-list-modern {
    list-style: none;
    padding: 0;
    margin: 0;
}

.task-item-modern {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    transition: all 0.3s;
}

.task-item-modern:last-child {
    border-bottom: none;
}

.task-item-modern:hover {
    background: var(--purple-bg);
    border-radius: 12px;
}

.task-checkbox {
    margin-top: 0.25rem;
}

.task-checkbox input[type="checkbox"] {
    width: 20px;
    height: 20px;
    cursor: pointer;
}

.task-content {
    flex: 1;
}

.task-content h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 0.75rem;
}

.task-meta {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
    margin-bottom: 0.5rem;
}

.task-student,
.task-due {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--text-light);
}

.task-student svg,
.task-due svg {
    width: 16px;
    height: 16px;
}

.task-description {
    font-size: 0.95rem;
    color: var(--text-light);
    line-height: 1.6;
}

.task-actions {
    display: flex;
    gap: 0.5rem;
}

/* 教材卡片 */
.materials-grid-modern {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

.material-card-modern {
    display: flex;
    align-items: center;
    gap: 1.25rem;
    padding: 1.5rem;
    background: var(--white);
    border-radius: 16px;
    box-shadow: var(--shadow);
    transition: all 0.3s;
}

.material-card-modern:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.material-icon {
    width: 56px;
    height: 56px;
    border-radius: 12px;
    background: linear-gradient(135deg, rgba(74, 144, 226, 0.1), rgba(167, 139, 250, 0.1));
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-color);
    flex-shrink: 0;
}

.material-icon svg {
    width: 28px;
    height: 28px;
}

.material-info {
    flex: 1;
}

.material-info h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 0.75rem;
}

.material-meta {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.material-type,
.material-date {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--text-light);
}

.material-type svg,
.material-date svg {
    width: 16px;
    height: 16px;
}

.material-actions {
    display: flex;
    gap: 0.5rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .page-header {
        flex-direction: column;
        gap: 1rem;
    }
    
    .page-actions {
        width: 100%;
    }
    
    .btn {
        flex: 1;
        justify-content: center;
    }
    
    .students-grid-modern,
    .classes-grid-modern,
    .materials-grid-modern {
        grid-template-columns: 1fr;
    }
    
    .quick-actions-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .class-stats {
        grid-template-columns: 1fr;
    }
    
    .task-item-modern {
        flex-wrap: wrap;
    }
}

/* 身份切换弹窗样式 */
.role-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.role-modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
}

.role-modal-content {
    position: relative;
    background: var(--white);
    border-radius: 12px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    max-width: 400px;
    width: 90%;
    max-height: 90vh;
    overflow: hidden;
    z-index: 1001;
}

.role-modal-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.role-modal-header h3 {
    margin: 0;
    font-size: 1.25rem;
    color: var(--text-color);
}

.role-modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-light);
    cursor: pointer;
    padding: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
    transition: all 0.3s;
}

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

.role-modal-body {
    padding: 1.5rem;
}

.role-buttons {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.role-btn {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem 1.5rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    background: var(--white);
    color: var(--text-color);
    cursor: pointer;
    font-size: 1rem;
    transition: all 0.3s;
    text-align: left;
    width: 100%;
}

.role-btn:hover {
    border-color: var(--primary-color);
    background: var(--purple-bg);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.role-btn-icon {
    font-size: 1.5rem;
}

.role-btn-text {
    font-weight: 500;
}

.role-btn-student:hover {
    border-color: #4A90E2;
    background: #E8F4FD;
}

.role-btn-teacher:hover {
    border-color: #50C878;
    background: #E8F9F0;
}

.role-btn-admin:hover {
    border-color: #6B46C1;
    background: #F3F4F6;
}

.role-modal-footer {
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
}

.role-btn-cancel {
    padding: 0.75rem 1.5rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: var(--white);
    color: var(--text-color);
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.3s;
}

.role-btn-cancel:hover {
    background: var(--purple-bg);
    border-color: var(--text-light);
}

/* 制作课文页面样式 */
body:has(.lesson-editor-page) {
    margin: 0;
    padding: 0;
    overflow: hidden;
}

body:has(.lesson-editor-page) .navbar {
    display: none !important;
}

body:has(.lesson-editor-page) .main-content {
    margin: 0;
    padding: 0;
    max-width: 100%;
    width: 100vw;
    height: 100vh;
    overflow: hidden;
}

.lesson-editor-page {
    width: 100vw;
    height: 100vh;
    display: flex;
    flex-direction: column;
    background: #F3F4F6;
    overflow: hidden;
    font-family: 'PingFang SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
}

.lesson-editor-header {
    height: 89px;
    background: transparent;
    display: flex;
    align-items: center;
    padding: 0 30px;
    flex-shrink: 0;
}

.lesson-back-btn {
    width: 62px;
    height: 40px;
    border: none;
    background: #FFFFFF;
    box-shadow: 0px 2px 4px rgba(0, 0, 0, 0.05);
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: #6B46C1;
    transition: all 0.3s;
    margin-right: 0;
    font-family: 'PingFang SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-weight: 500;
    font-size: 16px;
    line-height: 22px;
}

.lesson-back-btn:hover {
    background: #F5F5F5;
}

.lesson-back-btn svg {
    display: none;
}

.lesson-back-btn::before {
    content: '返回';
}

.lesson-editor-header-title {
    font-size: 32px;
    font-weight: 600;
    line-height: 45px;
    color: #6B46C1;
    margin: 0 0 0 18px;
    flex: 1;
}

.lesson-editor-header-title::after {
    content: attr(data-subtitle);
    color: #3a76ff;
    margin-left: 8px;
}

.lesson-editor-header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.lesson-editor-main {
    flex: 1;
    overflow: hidden;
    display: flex;
    background: #F3F4F6;
    padding: 0 30px 30px;
}

.lesson-editor-container {
    display: flex;
    flex: 1;
    height: 100%;
    background: #F3F4F6;
    overflow: hidden;
    gap: 0;
}

/* 左侧：课程顺序 */
.lesson-steps-sidebar {
    width: 252px;
    background: transparent;
    padding: 39px 0;
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    position: relative;
    min-height: 940px;
}

.lesson-steps-title {
    font-family: 'PingFang SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-weight: 600;
    font-size: 32px;
    line-height: 45px;
    letter-spacing: 0em;
    text-align: left;
    color: #6B46C1;
    padding-left: 83px;
    margin-bottom: 0;
    height: 45px;
}

.lesson-steps-list {
    display: flex;
    flex-direction: column;
    gap: 0;
    position: relative;
    padding-top: 0;
}

.lesson-step-item {
    background: transparent;
    border-radius: 0;
    padding: 0;
    box-shadow: none;
    cursor: pointer;
    transition: all 0.3s;
    height: 180px;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    align-items: flex-start;
    flex-shrink: 0;
    position: absolute;
    width: 252px;
}

.lesson-step-item[data-step="1"] {
    top: 30px;
}

.lesson-step-item[data-step="2"] {
    top: 210px;
}

.lesson-step-item[data-step="3"] {
    top: 390px;
    left: auto;
}

.lesson-step-item[data-step="4"] {
    top: 570px;
    left: auto;
}

.lesson-step-item[data-step="5"] {
    top: 750px;
}

.lesson-step-item:hover {
    box-shadow: none;
}

.lesson-step-header {
    position: absolute;
    left: 123px;
    top: 0;
    width: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0;
}

.lesson-step-checkbox {
    position: absolute;
    left: 30px;
    top: calc(50% - 14px/2);
    width: 14px;
    height: 14px;
    cursor: pointer;
    background: #FFFFFF;
    border: 1px solid #B7B5FF;
    border-radius: 4px;
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
}

.lesson-step-checkbox:checked {
    background: #B7B5FF;
    border-color: #B7B5FF;
}

.lesson-step-checkbox:checked::after {
    content: '✓';
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    color: #FFFFFF;
    font-size: 10px;
    font-weight: bold;
}

.lesson-step-label {
    font-size: 16px;
    font-weight: 500;
    line-height: 22px;
    color: #000000;
    cursor: pointer;
    text-align: center;
}

.lesson-step-chevron {
    position: absolute;
    left: 135px;
    top: 87px;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #B7B5FF;
    transition: transform 0.3s;
}

.lesson-step-item:hover .lesson-step-chevron {
    color: #8A5CF5;
}

/* 内容模块卡片 */
.lesson-module-card {
    box-sizing: border-box;
    position: relative;
    width: 100%;
    height: 160px;
    background: #FFFFFF;
    border: 1px solid #E7E0EC;
    box-shadow: 0px 8px 9px rgba(107, 70, 193, 0.05);
    border-radius: 30px;
    padding: 0;
    padding-right: 0px;
    margin-right: 0px;
    transition: all 0.3s;
    cursor: move;
    flex-shrink: 0;
}

.lesson-module-card.dragging {
    opacity: 0.5;
    transform: scale(0.98);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.15);
}

.lesson-module-card.drag-over {
    border-top: 3px solid #7C3AED;
    padding-top: calc(20px - 3px);
}

.lesson-module-card:hover {
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.lesson-module-drag-handle {
    position: absolute;
    left: 6px;
    top: 152px;
    width: 24px;
    height: 24px;
    cursor: move;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0.6;
}

.lesson-module-drag-handle:hover {
    opacity: 1;
}

.lesson-module-drag-handle img {
    width: 24px;
    height: 24px;
}

.lesson-module-checkbox {
    position: absolute;
    left: 30px;
    top: calc(50% - 14px/2);
    width: 14px;
    height: 14px;
}

.lesson-module-checkbox input[type="checkbox"] {
    width: 14px;
    height: 14px;
    cursor: pointer;
    background: #FFFFFF;
    border: 1px solid #B7B5FF;
    border-radius: 4px;
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
}

.lesson-module-checkbox input[type="checkbox"]:checked {
    background: #B7B5FF;
    border-color: #B7B5FF;
}

.lesson-module-checkbox input[type="checkbox"]:checked::after {
    content: '✓';
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    color: #FFFFFF;
    font-size: 10px;
    font-weight: bold;
}

.lesson-module-icon {
    position: absolute;
    left: 78px;
    top: calc(50% - 50px/2);
    width: 64px;
    height: 64px;
    border-radius: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    overflow: visible;
    background: unset;
    background-color: unset;
    background-image: none;
}

.lesson-module-icon img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

/* 第三步和第五步的图标位置略有不同 */
.lesson-module-card[data-step="3"] .lesson-module-icon,
.lesson-module-card[data-step="5"] .lesson-module-icon {
    left: 83px;
}

.video-icon {
    background: unset;
    background-color: unset;
    background-image: none;
}

.interaction-icon {
    background: unset;
    background-color: unset;
    background-image: none;
}

.pdf-icon {
    background: unset;
    background-color: unset;
    background-image: none;
}

.game-icon {
    background: unset;
    background-color: unset;
    background-image: none;
}

.lesson-module-preview {
    flex-shrink: 0;
}

/* 视频预览 */
.video-preview {
    position: absolute;
    left: 192px;
    top: calc(50% - 124px/2);
    width: 220px;
    height: 124px;
}

.video-thumbnail {
    position: absolute;
    width: 220px;
    height: 123px;
    left: 0px;
    top: calc(50% - 123px/2 - 0.5px);
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    border-radius: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.video-thumbnail::after {
    content: '';
    position: absolute;
    width: 220px;
    height: 124px;
    left: 0px;
    top: 0px;
    background: rgba(0, 0, 0, 0.5);
    border-radius: 20px;
}



.video-play-btn svg {
    width: 24px;
    height: 24px;
    margin-left: 3px;
}

.video-text {
    position: absolute;
    top: 12px;
    left: 12px;
    font-size: 24px;
    font-weight: bold;
    color: #FFFFFF;
    z-index: 3;
}

/* 互动预览 - 图片集横向滚动 */
.interaction-preview {
    position: absolute;
    height: 139px;
    left: 192px;
    right: 92px;
    top: calc(50% - 139px/2 + 0.5px);
    overflow-x: scroll;
    overflow-y: hidden;
}

.interaction-thumbnails {
    display: flex;
    gap: 20px;
    height: 124px;
    align-items: center;
    width: max-content;
    padding-top: calc(139px/2 - 124px/2 + 0.5px);
}

.interaction-thumb {
    width: 220px;
    height: 124px;
    border-radius: 20px;
    overflow: hidden;
    background: #F5F5F5;
    flex-shrink: 0;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
}

.interaction-thumb-content {
    display: none;
}

.interaction-char {
    display: none;
}

.interaction-text {
    display: none;
}

/* PDF预览 */
.pdf-preview {
    position: absolute;
    left: 192px;
    top: calc(50% - 124px/2);
    width: 218px;
    height: 124px;
}

.pdf-thumbnail {
    position: absolute;
    width: 218px;
    height: 124px;
    left: 0px;
    top: 0px;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    border-radius: 20px;
    overflow: hidden;
    border: none;
}

.pdf-preview-content {
    width: 100%;
    height: 100%;
    padding: 8px;
    background: linear-gradient(135deg, #E8F5E9 0%, #C8E6C9 100%);
    display: flex;
    align-items: center;
    justify-content: center;
}

.pdf-preview-scene {
    text-align: center;
    color: #333333;
}

.pdf-preview-text {
    font-size: 14px;
    font-weight: bold;
    margin-bottom: 4px;
}

.pdf-preview-word {
    font-size: 12px;
    margin-bottom: 2px;
}

.pdf-preview-translation {
    font-size: 10px;
    color: #666666;
    margin-top: 4px;
}

/* 游戏预览 */
.game-preview {
    position: absolute;
    left: 192px;
    top: 45px;
    width: 868px;
    height: 70px;
}

.game-buttons {
    display: flex;
    gap: 12px;
    height: 100%;
}

.game-btn {
    width: 154px;
    height: 70px;
    padding: 0;
    border: none;
    border-radius: 20px;
    font-size: 24px;
    font-weight: 600;
    line-height: 34px;
    color: #FFFFFF;
    cursor: pointer;
    transition: all 0.3s;
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'PingFang SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
}

.game-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.game-btn.red {
    background: #FF5257;
}

.game-btn.green {
    background: #00C8B3;
}

.game-btn.purple {
    background: #6155F5;
    color: #FFFFFF;
}

.game-btn.blue {
    background: #0088FF;
}

/*右侧模块信息和操作 */
.lesson-module-info {
    position: absolute;
    left: 442px;
    top: 0;
    width: auto;
    height: 160px;
}



.module-duration {
    position: absolute;
    width: 42px;
    height: 34px;
    left: 35px;
    top: calc(50% - 34px/2 + 30px);
    font-size: 24px;
    font-weight: 600;
    line-height: 34px;
    color: #000000;
    display: flex;
    align-items: center;
    font-family: 'PingFang SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
}

/* 视频时长图标 */
.module-duration-icon {
    position: absolute;
    width: 24px;
    height: 24px;
    left: 0px;
    top: calc(50% - 24px/2 + 30px);
    color: #8A5CF5;
}

.module-actions-inline {
    position: absolute;
    left: 442px;
    top: calc(50% - 22px/2 + 36px);
    display: flex;
    gap: 42px;
    margin-top: 0;
    align-items: center;
    height: 22px;
}

.module-actions-inline .module-link-btn:first-child {
    position: relative;
}

.module-actions-inline .module-link-btn.download-btn {
    position: relative;
    margin-left: 0;
}

.module-link-btn {
    padding: 0;
    background: transparent;
    border: none;
    border-radius: 0;
    font-size: 16px;
    line-height: 22px;
    color: #8A5CF5;
    cursor: pointer;
    transition: all 0.3s;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0;
    font-weight: 400;
    width: 100%;
    vertical-align: middle;
}

.module-link-btn:hover {
    color: #7C3AED;
}

.module-link-btn.download-btn {
    padding: 0;
    width: 24px;
    height: 24px;
    position: absolute;
    left: 82px;
    top: 0;
    margin-left: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.module-link-btn.download-btn svg {
    width: 24px;
    height: 24px;
}

.lesson-module-actions {
    position: static;
    right: 30px;
    width: 24px;
    height: 100%;
    display: flex;
    flex-direction: column;
    gap: 0;
    flex-shrink: 0;
    align-items: center;
    justify-content: center;
}



.module-action-btn {
    width: 24px;
    height: 24px;
    border: none;
    background: transparent;
    border-radius: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s;
    color: #666666;
    position: relative;
}

.module-action-btn:hover {
    opacity: 0.8;
}

.module-action-btn img {
    width: 24px;
    height: 24px;
    object-fit: contain;
    display: block;
}

.module-action-btn.add-btn {
    background: transparent;
    border: none;
    position: absolute;
    top: 44px;
}

.module-action-btn.add-btn:hover {
    opacity: 0.8;
    transform: none;
}

.module-action-btn[title="编辑"] {
    top: calc(50% - 24px/2 - 44px);
}

.module-action-btn[title="删除"] {
    top: calc(50% - 24px/2);
}

.module-action-btn.add-btn {
    top: calc(50% - 24px/2 + 44px);
}

/* 底部操作栏 */
.lesson-editor-footer {
    position: absolute;
    left: 751px;
    top: 1037px;
    padding: 0;
    border: none;
    display: flex;
    justify-content: flex-start;
    gap: 0;
    background: transparent;
    z-index: 100;
    height: 40px;
}

.lesson-footer-btn {
    width: 62px;
    height: 40px;
    border: none;
    border-radius: 6px;
    font-size: 16px;
    font-weight: 500;
    line-height: 22px;
    cursor: pointer;
    transition: all 0.3s;
    font-family: 'PingFang SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
}

.lesson-footer-btn.cancel {
    width: 62px;
    height: 40px;
    background: #FFFFFF;
    color: #000000;
    border: 1px solid #E2E8ED;
    border-radius: 6px;
}

.lesson-footer-btn.cancel:hover {
    background: #F5F5F5;
}

.lesson-footer-btn.draft {
    width: 62px;
    height: 40px;
    margin-left: 20px;
    background: #8A5CF5;
    color: #FFFFFF;
    box-shadow: 0px 2px 4px rgba(0, 0, 0, 0.05);
    border-radius: 6px;
}

.lesson-footer-btn.draft:hover {
    background: #7C3AED;
}

.lesson-footer-btn.publish {
    width: 62px;
    height: 40px;
    margin-left: 20px;
    background: #8A5CF5;
    color: #FFFFFF;
    box-shadow: 0px 2px 4px rgba(0, 0, 0, 0.05);
    border-radius: 6px;
}

.lesson-footer-btn.publish:hover {
    background: #7C3AED;
}