/* ==========================================
   极简智学 AETHER 样式设计系统 (Minimalism & Morandi)
   视觉特点：低饱和度、留白充足、排版克制、微动效
   ========================================== */

:root {
    /* 莫兰迪低饱和度护眼色系 */
    --bg-primary: #F3F5F7;          /* 极浅灰蓝底色 */
    --bg-card: #FFFFFF;             /* 纯白卡片背景 */
    --bg-sidebar: #E8ECEF;          /* 侧边栏莫兰迪浅灰 */
    
    --text-primary: #2C3539;        /* 莫兰迪深炭灰（避免纯黑，降低视觉疲劳） */
    --text-secondary: #6A757D;      /* 次要文字中灰 */
    --text-muted: #9AA4AC;          /* 辅助/静音文字浅灰 */
    
    --color-primary: #7A8E9A;       /* 主色：莫兰迪石板蓝 */
    --color-primary-hover: #657782;
    --color-primary-light: #EBF0F3;
    
    --color-secondary: #A0B2A6;     /* 辅助色：莫兰迪鼠尾草绿 */
    --color-secondary-light: #EFF4F0;
    
    --color-accent: #C8A29A;        /* 强调色：莫兰迪粉黛/暖沙 */
    --color-accent-light: #F9EFEF;
    
    --color-danger: #D4A3A3;        /* 警告色：莫兰迪腮红粉 */
    
    /* 细节边框与阴影 */
    --border-color: #E2E7EB;
    --border-radius-lg: 16px;
    --border-radius-md: 10px;
    --border-radius-sm: 6px;
    
    --shadow-soft: 0 10px 30px rgba(44, 53, 57, 0.02);
    --shadow-medium: 0 16px 40px rgba(44, 53, 57, 0.04);
    
    /* 动画过渡 */
    --transition-fast: all 0.2s cubic-bezier(0.25, 0.8, 0.25, 1);
    --transition-smooth: all 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
}

/* ==========================================
   1. 基础重置与全局布局
   ========================================== */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-size: 14px;
    line-height: 1.6;
    overflow: hidden;
    -webkit-font-smoothing: antialiased;
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: var(--transition-fast);
}
a:hover {
    color: var(--color-primary-hover);
}

button {
    font-family: inherit;
    font-size: inherit;
    color: inherit;
    background: none;
    border: none;
    cursor: pointer;
    outline: none;
}

/* 极简隐藏类 */
.hidden {
    display: none !important;
}

#app-container {
    width: 100vw;
    height: 100vh;
    position: relative;
    overflow: hidden;
}

/* 滚动条美化 */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* 极小按钮样式，主要用于紧凑控件 */
.btn-xs {
    height: 26px;
    padding: 0 10px;
    font-size: 11px;
    border-radius: var(--border-radius-sm);
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

/* ==========================================
   2. 登录视图样式 (/login)
   ========================================== */
#page-login {
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    background: linear-gradient(135deg, var(--bg-primary) 0%, #E2E6EA 100%);
}

.login-card {
    background-color: var(--bg-card);
    width: 420px;
    padding: 48px;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-medium);
    border: 1px solid rgba(255, 255, 255, 0.8);
    display: flex;
    flex-direction: column;
    animation: fadeInUp 0.6s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.login-header {
    text-align: center;
    margin-bottom: 36px;
}

.logo-circle {
    width: 54px;
    height: 54px;
    background-color: var(--color-primary-light);
    color: var(--color-primary);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 24px;
    margin: 0 auto 16px;
}

.login-header h1 {
    font-size: 24px;
    font-weight: 300;
    letter-spacing: 4px;
    color: var(--text-primary);
    margin-bottom: 6px;
}

.login-header .subtitle {
    font-size: 12px;
    color: var(--text-secondary);
    letter-spacing: 1px;
}

.input-group {
    margin-bottom: 20px;
}

.input-group label {
    display: block;
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: 8px;
    letter-spacing: 0.5px;
}

.input-group input {
    width: 100%;
    height: 44px;
    padding: 0 16px;
    background-color: var(--bg-primary);
    border: 1px solid transparent;
    border-radius: var(--border-radius-md);
    color: var(--text-primary);
    font-size: 14px;
    outline: none;
    transition: var(--transition-fast);
}

.input-group input:focus {
    border-color: var(--color-primary);
    background-color: var(--bg-card);
    box-shadow: 0 0 0 3px rgba(122, 142, 154, 0.1);
}

.login-options {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 12px;
    margin-bottom: 28px;
}

/* 复选框 */
.checkbox-container {
    display: flex;
    align-items: center;
    position: relative;
    padding-left: 22px;
    cursor: pointer;
    user-select: none;
    color: var(--text-secondary);
}
.checkbox-container input {
    position: absolute;
    opacity: 0;
    cursor: pointer;
    height: 0;
    width: 0;
}
.checkmark {
    position: absolute;
    top: 2px;
    left: 0;
    height: 14px;
    width: 14px;
    background-color: var(--bg-primary);
    border-radius: 3px;
    transition: var(--transition-fast);
}
.checkbox-container input:checked ~ .checkmark {
    background-color: var(--color-primary);
}
.checkmark:after {
    content: "";
    position: absolute;
    display: none;
}
.checkbox-container input:checked ~ .checkmark:after {
    display: block;
}
.checkbox-container .checkmark:after {
    left: 4.5px;
    top: 1.5px;
    width: 3.5px;
    height: 7px;
    border: solid white;
    border-width: 0 1.5px 1.5px 0;
    transform: rotate(45deg);
}

.forgot-link {
    color: var(--text-muted);
}
.forgot-link:hover {
    color: var(--text-primary);
}

.btn-primary {
    width: 100%;
    height: 46px;
    background-color: var(--color-primary);
    color: #FFFFFF;
    border-radius: var(--border-radius-md);
    font-weight: 500;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
    letter-spacing: 1px;
    transition: var(--transition-fast);
    box-shadow: 0 4px 12px rgba(122, 142, 154, 0.2);
}

.btn-primary:hover {
    background-color: var(--color-primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 6px 16px rgba(122, 142, 154, 0.3);
}

.btn-primary:active {
    transform: translateY(0);
}

.login-footer {
    margin-top: 32px;
    text-align: center;
    font-size: 11px;
    color: var(--text-muted);
    border-top: 1px solid var(--border-color);
    padding-top: 20px;
}

/* ==========================================
   3. 主程序导航布局
   ========================================= */
#page-main {
    width: 100%;
    height: 100%;
    display: grid;
    grid-template-columns: 240px 1fr;
}

/* 侧边栏样式 */
#global-sidebar {
    background-color: var(--bg-sidebar);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    padding: 24px 16px;
    z-index: 10;
}

.sidebar-header {
    margin-bottom: 32px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 16px;
    padding-left: 8px;
}

.brand-dot {
    width: 8px;
    height: 8px;
    background-color: var(--color-primary);
    border-radius: 50%;
}

.brand-text {
    font-size: 16px;
    font-weight: 500;
    letter-spacing: 2px;
    color: var(--text-primary);
}

/* 团队切换 */
.org-switcher {
    position: relative;
    background-color: rgba(255, 255, 255, 0.5);
    padding: 8px 12px;
    border-radius: var(--border-radius-sm);
    font-size: 12px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition-fast);
}

.org-switcher:hover {
    background-color: rgba(255, 255, 255, 0.9);
}

.org-switcher span {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    padding-right: 6px;
    color: var(--text-secondary);
}

.org-switcher i {
    font-size: 10px;
    color: var(--text-muted);
}

.org-dropdown {
    position: absolute;
    top: calc(100% + 6px);
    left: 0;
    right: 0;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    box-shadow: var(--shadow-soft);
    overflow: hidden;
    z-index: 20;
    animation: fadeIn 0.2s ease;
}

.org-item {
    padding: 8px 12px;
    transition: var(--transition-fast);
}

.org-item:hover {
    background-color: var(--bg-primary);
    color: var(--color-primary);
}

.org-item.active {
    background-color: var(--color-primary-light);
    color: var(--color-primary);
    font-weight: 500;
}

/* 侧边栏菜单 */
.sidebar-menu {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    border-radius: var(--border-radius-md);
    color: var(--text-secondary);
    font-weight: 400;
    transition: var(--transition-fast);
    text-align: left;
    position: relative;
}

.nav-item i {
    font-size: 16px;
    width: 20px;
}

.nav-item:hover {
    background-color: rgba(255, 255, 255, 0.4);
    color: var(--text-primary);
}

.nav-item.active {
    background-color: var(--bg-card);
    color: var(--color-primary);
    font-weight: 500;
    box-shadow: 0 4px 12px rgba(44, 53, 57, 0.01);
}

.nav-item .badge {
    position: absolute;
    right: 16px;
    background-color: var(--color-accent);
    color: #FFFFFF;
    font-size: 10px;
    padding: 2px 6px;
    border-radius: 10px;
    font-weight: 500;
}

/* 侧边栏底部 */
.sidebar-footer {
    display: flex;
    flex-direction: column;
    gap: 16px;
    border-top: 1px solid rgba(44, 53, 57, 0.05);
    padding-top: 20px;
}

.recent-course-shortcut {
    background-color: rgba(255, 255, 255, 0.4);
    border: 1px dashed var(--color-primary);
    border-radius: var(--border-radius-md);
    padding: 10px 12px;
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    transition: var(--transition-fast);
}

.recent-course-shortcut:hover {
    background-color: var(--bg-card);
    border-style: solid;
    transform: translateY(-1px);
}

.shortcut-icon {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background-color: var(--color-primary-light);
    color: var(--color-primary);
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 11px;
}

.shortcut-info {
    display: flex;
    flex-direction: column;
}

.shortcut-label {
    font-size: 10px;
    color: var(--text-muted);
}

.shortcut-name {
    font-size: 12px;
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 140px;
}

.user-profile {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 6px;
    border-radius: var(--border-radius-md);
    cursor: pointer;
    transition: var(--transition-fast);
}

.user-profile:hover {
    background-color: rgba(255, 255, 255, 0.4);
}

.avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    object-fit: cover;
    background-color: var(--border-color);
}

.user-info {
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.user-name {
    font-weight: 500;
    font-size: 13px;
}

.user-role {
    font-size: 10px;
    color: var(--text-muted);
}

.logout-icon {
    font-size: 14px;
    color: var(--text-muted);
    padding: 6px;
    transition: var(--transition-fast);
}

.logout-icon:hover {
    color: var(--color-danger);
}

/* ==========================================
   4. 主内容区与头部样式
   ========================================= */
#main-content {
    display: grid;
    grid-template-rows: 64px 1fr;
    height: 100vh;
    overflow: hidden;
}

#main-header {
    background-color: rgba(243, 245, 247, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(226, 231, 235, 0.8);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 32px;
    z-index: 5;
}

/* 全局搜索 */
.search-bar {
    position: relative;
    display: flex;
    align-items: center;
    width: 380px;
}

.search-bar i {
    position: absolute;
    left: 14px;
    color: var(--text-muted);
}

.search-bar input {
    width: 100%;
    height: 36px;
    padding: 0 16px 0 38px;
    border: 1px solid var(--border-color);
    background-color: rgba(255, 255, 255, 0.5);
    border-radius: 20px;
    outline: none;
    font-size: 13px;
    transition: var(--transition-smooth);
}

.search-bar input:focus {
    background-color: var(--bg-card);
    width: 440px;
    border-color: var(--color-primary);
    box-shadow: 0 4px 16px rgba(44, 53, 57, 0.03);
}

.search-results-dropdown {
    position: absolute;
    top: 42px;
    left: 0;
    right: 0;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-medium);
    z-index: 100;
    max-height: 280px;
    overflow-y: auto;
    padding: 8px 0;
    animation: fadeIn 0.2s ease;
}

.search-res-item {
    padding: 10px 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    transition: var(--transition-fast);
}

.search-res-item:hover {
    background-color: var(--bg-primary);
}

.search-res-title {
    font-weight: 500;
}

.search-res-category {
    font-size: 11px;
    background-color: var(--color-primary-light);
    color: var(--color-primary);
    padding: 2px 6px;
    border-radius: 4px;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 24px;
}

/* 通知 */
.notification-bell {
    position: relative;
    cursor: pointer;
    font-size: 18px;
    color: var(--text-secondary);
    transition: var(--transition-fast);
}

.notification-bell:hover {
    color: var(--text-primary);
    transform: scale(1.05);
}

.bell-badge {
    position: absolute;
    top: -4px;
    right: -4px;
    width: 7px;
    height: 7px;
    background-color: var(--color-accent);
    border-radius: 50%;
}

.notification-dropdown {
    position: absolute;
    top: 30px;
    right: -10px;
    width: 320px;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-medium);
    overflow: hidden;
    z-index: 100;
    animation: fadeIn 0.2s ease;
}

.notif-header {
    padding: 14px 16px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.notif-header h3 {
    font-size: 14px;
    font-weight: 500;
}

.btn-text {
    font-size: 12px;
    color: var(--color-primary);
}
.btn-text:hover {
    color: var(--color-primary-hover);
}

.notif-list {
    max-height: 240px;
    overflow-y: auto;
}

.notif-item {
    padding: 12px 16px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    gap: 4px;
    cursor: pointer;
    transition: var(--transition-fast);
}

.notif-item:hover {
    background-color: var(--bg-primary);
}

.notif-item.unread {
    background-color: var(--color-primary-light);
}

.notif-title {
    font-weight: 500;
    font-size: 12px;
}

.notif-time {
    font-size: 10px;
    color: var(--text-muted);
}

.date-display {
    font-size: 13px;
    color: var(--text-secondary);
}

/* ==========================================
   5. 主视图容器与子页
   ========================================= */
#view-container {
    width: 100%;
    height: 100%;
    overflow-y: auto;
    padding: 32px;
}

.content-view {
    animation: fadeIn 0.4s ease;
}

/* R1 学习首页视图 */
.hero-banner {
    background: linear-gradient(100deg, #7A8E9A 0%, #99A8B0 100%);
    color: #FFFFFF;
    border-radius: var(--border-radius-lg);
    padding: 36px 48px;
    margin-bottom: 32px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow-medium);
}

.tag-accent {
    font-size: 11px;
    background-color: rgba(255, 255, 255, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.3);
    padding: 3px 8px;
    border-radius: 20px;
    text-transform: uppercase;
    letter-spacing: 1px;
    display: inline-block;
    margin-bottom: 12px;
}

.hero-text h2 {
    font-size: 24px;
    font-weight: 300;
    letter-spacing: 1px;
    margin-bottom: 6px;
}

.course-meta {
    font-size: 13px;
    opacity: 0.85;
    margin-bottom: 20px;
}

.progress-container-inline {
    display: flex;
    align-items: center;
    gap: 12px;
}

.progress-bar-wrapper {
    width: 180px;
    height: 4px;
    background-color: rgba(255, 255, 255, 0.25);
    border-radius: 2px;
    overflow: hidden;
}

.progress-text {
    font-size: 12px;
    opacity: 0.9;
}

.btn-white-accent {
    background-color: #FFFFFF;
    color: var(--color-primary);
    padding: 12px 24px;
    border-radius: var(--border-radius-md);
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 10px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
    transition: var(--transition-fast);
}

.btn-white-accent:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
}

/* 首页栅格 */
.home-grid {
    display: grid;
    grid-template-columns: 1fr 340px;
    gap: 32px;
}

.grid-col-left {
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.grid-col-right {
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.section-card {
    background-color: var(--bg-card);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-soft);
    padding: 28px;
    position: relative;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.section-header h3 {
    font-size: 16px;
    font-weight: 500;
    position: relative;
    padding-left: 12px;
}
.section-header h3::before {
    content: "";
    position: absolute;
    left: 0;
    top: 4px;
    width: 3px;
    height: 14px;
    background-color: var(--color-primary);
    border-radius: 2px;
}

.subtitle-hint {
    font-size: 12px;
    color: var(--text-muted);
}

/* 课程网格 */
.courses-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.course-card {
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    padding: 20px;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.course-card:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-medium);
    transform: translateY(-2px);
}

.course-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 12px;
}

.course-tag {
    font-size: 10px;
    padding: 2px 6px;
    border-radius: 4px;
    font-weight: 500;
}
.course-tag.ongoing {
    background-color: var(--color-primary-light);
    color: var(--color-primary);
}
.course-tag.completed {
    background-color: var(--color-secondary-light);
    color: var(--color-secondary);
}

.course-card h4 {
    font-size: 15px;
    font-weight: 500;
    margin-bottom: 4px;
}

.course-teacher {
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.course-card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 12px;
}

.course-progress-inline {
    width: 60%;
    height: 4px;
    background-color: var(--bg-primary);
    border-radius: 2px;
    position: relative;
}
.course-progress-fill {
    height: 100%;
    background-color: var(--color-primary);
    border-radius: 2px;
}

.course-pct {
    font-weight: 500;
    color: var(--text-secondary);
}

/* 个性化推荐 */
.recommendations-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.rec-item {
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    padding: 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition-fast);
    cursor: pointer;
}

.rec-item:hover {
    background-color: var(--color-secondary-light);
    border-color: var(--color-secondary);
}

.rec-left {
    display: flex;
    align-items: center;
    gap: 16px;
}

.rec-icon {
    width: 36px;
    height: 36px;
    border-radius: var(--border-radius-md);
    background-color: var(--bg-primary);
    color: var(--text-secondary);
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 16px;
}
.rec-item:hover .rec-icon {
    background-color: #FFFFFF;
    color: var(--color-secondary);
}

.rec-info h5 {
    font-size: 13px;
    font-weight: 500;
    margin-bottom: 2px;
}

.rec-meta {
    font-size: 11px;
    color: var(--text-muted);
}

.rec-reason {
    font-size: 11px;
    background-color: var(--color-accent-light);
    color: var(--color-accent);
    padding: 2px 8px;
    border-radius: 10px;
    font-weight: 500;
}

/* 本周统计 */
.stat-item {
    display: flex;
    align-items: baseline;
    gap: 12px;
    padding-bottom: 16px;
    border-bottom: 1px dashed var(--border-color);
}
.stat-item:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.stat-num {
    font-size: 28px;
    font-weight: 300;
    color: var(--color-primary);
    font-family: 'Inter', sans-serif;
}

.stat-label {
    font-size: 12px;
    color: var(--text-secondary);
}

/* 薄弱知识点 */
.weakness-analysis .hint-text {
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.weakness-list {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.weakness-tag {
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 6px 14px;
    font-size: 12px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: var(--transition-fast);
}

.weakness-tag:hover {
    border-color: var(--color-accent);
    background-color: var(--color-accent-light);
    color: var(--color-accent);
}

.weakness-level {
    width: 6px;
    height: 6px;
    border-radius: 50%;
}
.weakness-level.high {
    background-color: var(--color-danger);
}
.weakness-level.medium {
    background-color: var(--color-accent);
}

/* ==========================================
   6. R2 学习目标设定视图样式
   ========================================= */
.back-nav {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: var(--text-secondary);
    cursor: pointer;
    margin-bottom: 24px;
    transition: var(--transition-fast);
}
.back-nav:hover {
    color: var(--color-primary);
    transform: translateX(-2px);
}

.narrow-container {
    max-width: 760px;
    margin: 0 auto;
    padding: 20px 0;
}

.setup-header {
    text-align: center;
    margin-bottom: 40px;
}

.step-badge {
    font-size: 11px;
    background-color: var(--color-primary-light);
    color: var(--color-primary);
    padding: 3px 10px;
    border-radius: 12px;
    font-weight: 500;
}

.setup-header h2 {
    font-size: 22px;
    font-weight: 400;
    margin-top: 12px;
    margin-bottom: 8px;
}

.setup-header .desc {
    color: var(--text-secondary);
    font-size: 13px;
}

.paths-selection {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-bottom: 40px;
}

.path-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: 24px 32px;
    cursor: pointer;
    display: grid;
    grid-template-columns: 24px 1fr 120px;
    align-items: center;
    gap: 20px;
    transition: var(--transition-smooth);
}

.path-card:hover {
    transform: translateY(-2px);
    border-color: var(--color-primary);
    box-shadow: var(--shadow-medium);
}

.path-card.selected {
    border-color: var(--color-primary);
    background-color: var(--color-primary-light);
}

.path-radio {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    border: 2px solid var(--text-muted);
    display: flex;
    justify-content: center;
    align-items: center;
    transition: var(--transition-fast);
}
.path-card.selected .path-radio {
    border-color: var(--color-primary);
}
.path-radio-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: transparent;
    transition: var(--transition-fast);
}
.path-card.selected .path-radio-dot {
    background-color: var(--color-primary);
}

.path-details h4 {
    font-size: 15px;
    font-weight: 500;
    margin-bottom: 4px;
}

.path-details p {
    font-size: 12px;
    color: var(--text-secondary);
}

.path-meta {
    text-align: right;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.path-points {
    font-size: 14px;
    font-weight: 500;
    color: var(--color-primary);
}

.path-time {
    font-size: 11px;
    color: var(--text-muted);
}

.action-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-top: 1px solid var(--border-color);
    padding-top: 24px;
}

.btn-secondary {
    padding: 12px 24px;
    border-radius: var(--border-radius-md);
    color: var(--text-secondary);
    transition: var(--transition-fast);
}
.btn-secondary:hover {
    color: var(--text-primary);
    background-color: rgba(44, 53, 57, 0.05);
}

/* ==========================================
   7. R3 数字教师 / 学习风格测试
   ========================================= */
.assess-container {
    display: grid;
    grid-template-columns: 260px 1fr;
    gap: 32px;
    max-width: 1000px;
    margin: 0 auto;
}

.assess-sidebar {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: 24px;
    height: fit-content;
}

.assess-sidebar h3 {
    font-size: 15px;
    font-weight: 500;
    margin-bottom: 12px;
}

.assess-sidebar .desc {
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: 24px;
    line-height: 1.5;
}

.reference-box {
    border-top: 1px solid var(--border-color);
    padding-top: 16px;
    margin-bottom: 24px;
}

.reference-box h4 {
    font-size: 12px;
    font-weight: 500;
    margin-bottom: 8px;
    color: var(--text-secondary);
}

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

.reference-box a {
    font-size: 12px;
}

.btn-outline {
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    padding: 10px 16px;
    font-size: 12px;
    text-align: center;
    transition: var(--transition-fast);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}
.btn-outline:hover {
    border-color: var(--text-secondary);
    background-color: var(--bg-primary);
}
.btn-full {
    width: 100%;
}

.assess-chat-box {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    height: 520px;
    display: grid;
    grid-template-rows: 64px 1fr 64px;
    overflow: hidden;
}

.chat-header {
    border-bottom: 1px solid var(--border-color);
    padding: 0 24px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.tutor-avatar-circle {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background-color: var(--color-primary-light);
    color: var(--color-primary);
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 14px;
}

.tutor-meta {
    display: flex;
    flex-direction: column;
}

.tutor-name {
    font-weight: 500;
    font-size: 13px;
}

.tutor-status {
    font-size: 10px;
    color: var(--color-secondary);
}

.chat-messages {
    padding: 24px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.chat-msg {
    display: flex;
    gap: 12px;
    max-width: 80%;
}

.chat-msg.tutor {
    align-self: flex-start;
}

.chat-msg.student {
    align-self: flex-end;
    flex-direction: row-reverse;
}

.msg-bubble {
    padding: 12px 16px;
    border-radius: var(--border-radius-md);
    font-size: 13px;
}

.tutor .msg-bubble {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    border-top-left-radius: 0;
}

.student .msg-bubble {
    background-color: var(--color-primary-light);
    color: var(--color-primary);
    border-top-right-radius: 0;
}

.msg-assess-card {
    background-color: #FFFFFF;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    padding: 16px;
    margin-top: 10px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    width: 320px;
}

.assess-q-title {
    font-weight: 500;
    font-size: 12px;
    color: var(--text-primary);
}

.assess-opt-btn {
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    padding: 8px 12px;
    text-align: left;
    font-size: 11px;
    transition: var(--transition-fast);
}
.assess-opt-btn:hover {
    border-color: var(--color-primary);
    background-color: var(--color-primary-light);
    color: var(--color-primary);
}

.chat-input-area {
    border-top: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    padding: 0 16px;
}

.chat-input-area input {
    flex-grow: 1;
    height: 100%;
    border: none;
    outline: none;
    font-size: 13px;
}

.btn-send {
    color: var(--color-primary);
    font-size: 16px;
    padding: 10px;
    transition: var(--transition-fast);
}
.btn-send:hover {
    color: var(--color-primary-hover);
    transform: scale(1.05);
}

/* ==========================================
   8. R4 课程学习中心页框架
   ========================================= */
.learning-center-header {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: 24px 32px;
    margin-bottom: 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.lc-title-row {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 8px;
}

.back-to-home {
    cursor: pointer;
    font-size: 18px;
    color: var(--text-muted);
    transition: var(--transition-fast);
}
.back-to-home:hover {
    color: var(--text-primary);
}

.lc-title-row h2 {
    font-size: 20px;
    font-weight: 400;
}

.lc-badges {
    display: flex;
    gap: 12px;
}

.lc-badge {
    font-size: 11px;
    color: var(--text-secondary);
    background-color: var(--bg-primary);
    padding: 2px 8px;
    border-radius: 4px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.lc-badge i {
    color: var(--color-primary);
}

.lc-actions {
    display: flex;
    gap: 12px;
}

.btn-sm {
    height: 34px;
    padding: 0 16px;
    font-size: 12px;
}

/* 子导航卡片 */
.lc-sub-nav {
    display: flex;
    gap: 12px;
    margin-bottom: 24px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 1px;
}

.sub-nav-item {
    padding: 12px 24px;
    font-size: 13px;
    color: var(--text-secondary);
    border-bottom: 2px solid transparent;
    transition: var(--transition-fast);
}

.sub-nav-item i {
    margin-right: 6px;
}

.sub-nav-item:hover {
    color: var(--text-primary);
}

.sub-nav-item.active {
    color: var(--color-primary);
    border-bottom-color: var(--color-primary);
    font-weight: 500;
}

/* 学习中心主内容区 (严格依照PRD：左侧为助教+检索，右侧为主工作区) */
.lc-main-layout {
    display: grid;
    grid-template-columns: 320px 1fr;
    gap: 24px;
    height: calc(100vh - 280px);
}

.lc-left-pane {
    height: 100%;
}

.lc-right-pane {
    height: 100%;
    overflow-y: auto;
    padding-right: 6px;
    position: relative;
}

.lc-workplace-relative {
    position: relative;
    width: 100%;
    height: 100%;
}

.lc-sub-view {
    animation: fadeIn 0.3s ease;
    height: 100%;
}

/* ==========================================
   9. R5 学习地图子页面样式
   ========================================= */
.map-grid {
    display: grid;
    grid-template-columns: 1.25fr 0.75fr;
    gap: 24px;
    height: 100%;
}

.map-tree-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: 24px;
    overflow-y: auto;
    height: 100%;
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 14px;
    margin-bottom: 20px;
}

.panel-header h4 {
    font-size: 14px;
    font-weight: 500;
}

.map-view-switcher {
    display: flex;
    gap: 4px;
}

.btn-xs.active {
    background-color: var(--color-primary-light);
    color: var(--color-primary);
    border-color: var(--color-primary);
    font-weight: 500;
}

.path-indicator {
    font-size: 11px;
    background-color: var(--color-secondary-light);
    color: var(--color-secondary);
    padding: 2px 8px;
    border-radius: 4px;
}

/* 网络图谱连接线条 */
.map-nodes-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
    position: relative;
    padding-left: 20px;
}

.map-nodes-list::before {
    content: "";
    position: absolute;
    left: 8px;
    top: 10px;
    bottom: 10px;
    width: 2px;
    background-color: var(--border-color);
    z-index: 1;
}

.map-node-item {
    position: relative;
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    padding: 14px 18px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    z-index: 2;
    transition: var(--transition-fast);
}

.map-node-item:hover {
    background-color: var(--color-primary-light);
    border-color: var(--color-primary);
    transform: translateX(4px);
}

.map-node-left {
    display: flex;
    align-items: center;
    gap: 12px;
}

.map-node-status {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background-color: #FFFFFF;
    border: 2px solid var(--text-muted);
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 9px;
    color: transparent;
    transition: var(--transition-fast);
}
.map-node-item.completed .map-node-status {
    background-color: var(--color-secondary);
    border-color: var(--color-secondary);
    color: #FFFFFF;
}
.map-node-item.ongoing .map-node-status {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.map-node-title {
    font-weight: 500;
    font-size: 13px;
}

.map-node-item.ongoing .map-node-title {
    color: var(--color-primary);
}

.map-node-right {
    font-size: 11px;
    color: var(--text-muted);
}

/* 树形目录列表 */
.map-directory-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.dir-chapter-item {
    border-bottom: 1px solid var(--border-color);
    padding: 12px 0;
}

.dir-chapter-item h5 {
    font-size: 13px;
    font-weight: 500;
    margin-bottom: 6px;
}

.dir-resources-links {
    display: flex;
    gap: 12px;
    padding-left: 12px;
}

.dir-link {
    font-size: 11px;
    color: var(--color-primary);
    display: flex;
    align-items: center;
    gap: 4px;
}

/* 右侧能力模型与学习建议 */
.map-analysis-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    height: 100%;
    overflow-y: auto;
}

.report-shortcut-link {
    font-size: 11px;
    color: var(--color-primary);
}

.radar-visual-wrapper {
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    height: 150px;
    margin: 10px 0;
}

/* 雷达图仿真 */
.css-radar {
    position: relative;
    width: 110px;
    height: 110px;
}

.radar-ring {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    border: 1px solid var(--border-color);
    border-radius: 50%;
}
.radar-ring.r1 { width: 100%; height: 100%; }
.radar-ring.r2 { width: 66%; height: 66%; }
.radar-ring.r3 { width: 33%; height: 33%; }

.radar-polygon {
    position: absolute;
    width: 80px;
    height: 80px;
    top: 15px;
    left: 15px;
    background-color: rgba(122, 142, 154, 0.2);
    clip-path: polygon(50% 10%, 90% 40%, 75% 85%, 25% 85%, 10% 40%);
    border: 1px solid var(--color-primary);
}

.radar-label {
    position: absolute;
    font-size: 9px;
    color: var(--text-secondary);
    white-space: nowrap;
}
.radar-label.l1 { top: -14px; left: 50%; transform: translateX(-50%); }
.radar-label.l2 { top: 24px; right: -32px; }
.radar-label.l3 { bottom: -4px; right: -6px; }
.radar-label.l4 { bottom: -4px; left: -6px; }
.radar-label.l5 { top: 24px; left: -32px; }

.ai-suggestion-box {
    background-color: var(--color-primary-light);
    border-radius: var(--border-radius-md);
    padding: 14px;
}

.ai-suggestion-box .ai-title {
    font-size: 12px;
    font-weight: 500;
    color: var(--color-primary);
    margin-bottom: 6px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.ai-suggestion-box p {
    font-size: 11px;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* 核心学习资源 (R5) */
.map-resources-box {
    border-top: 1px solid var(--border-color);
    padding-top: 14px;
}

.resources-title {
    font-size: 12px;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.resources-list {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.res-link-item {
    font-size: 11px;
    color: var(--text-secondary);
    background-color: var(--bg-primary);
    padding: 6px 12px;
    border-radius: 4px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition-fast);
}
.res-link-item:hover {
    background-color: var(--color-secondary-light);
    color: var(--color-secondary);
}

.res-link-item i {
    font-size: 10px;
    color: var(--text-muted);
}

/* ==========================================
   10. R6 数字讲义子页面样式
   ========================================= */
.handout-layout {
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: 20px;
    height: 100%;
}

.handout-sidebar {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: 16px;
    overflow-y: auto;
}

.handout-catalog {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.catalog-item {
    font-size: 12px;
    padding: 10px 12px;
    border-radius: var(--border-radius-sm);
    color: var(--text-secondary);
    text-align: left;
    transition: var(--transition-fast);
}

.catalog-item:hover {
    background-color: var(--bg-primary);
    color: var(--text-primary);
}

.catalog-item.active {
    background-color: var(--color-primary-light);
    color: var(--color-primary);
    font-weight: 500;
}

.handout-body-wrapper {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: 40px;
    overflow-y: auto;
    height: 100%;
}

.handout-article h2 {
    font-size: 20px;
    font-weight: 400;
    margin-bottom: 24px;
}

.handout-article p {
    font-size: 14px;
    color: var(--text-primary);
    line-height: 1.7;
    margin-bottom: 20px;
}

/* 讲义内嵌跳转链接样式 */
.inline-link {
    color: var(--color-accent);
    border-bottom: 1px dashed var(--color-accent);
    padding: 0 4px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-fast);
}
.inline-link:hover {
    background-color: var(--color-accent-light);
    color: #a67269;
}

.handout-illustration {
    background-color: var(--color-secondary-light);
    border-left: 3px solid var(--color-secondary);
    border-radius: 4px;
    padding: 20px;
    margin: 24px 0;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.illustration-caption {
    font-size: 11px;
    color: var(--text-muted);
}

.illustration-visual {
    height: 8px;
    background-color: rgba(255, 255, 255, 0.6);
    border-radius: 4px;
    position: relative;
    overflow: hidden;
}
.illustration-visual-fill {
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    width: 60%;
    background-color: var(--color-secondary);
}

.handout-ai-interaction {
    background-color: var(--color-accent-light);
    border: 1px dashed var(--color-accent);
    border-radius: var(--border-radius-md);
    padding: 20px;
    margin-top: 32px;
}

.ai-interactive-header {
    font-weight: 500;
    font-size: 13px;
    color: var(--color-accent);
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.ai-interactive-body {
    font-size: 12px;
    color: var(--text-secondary);
    line-height: 1.5;
}

.btn-interactive-suggest {
    background-color: #FFFFFF;
    border: 1px solid var(--color-accent);
    color: var(--color-accent);
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 11px;
    margin-top: 12px;
    display: inline-block;
    transition: var(--transition-fast);
}

.btn-interactive-suggest:hover {
    background-color: var(--color-accent);
    color: #FFFFFF;
}

/* ==========================================
   11. R7 课堂子页面样式
   ========================================= */
.classroom-layout {
    display: flex;
    flex-direction: column;
    gap: 24px;
    height: 100%;
}

.classroom-stats-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.cr-stat {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    padding: 20px;
    text-align: center;
    box-shadow: var(--shadow-soft);
}

.cr-num {
    display: block;
    font-size: 24px;
    font-weight: 300;
    color: var(--color-primary);
}

.cr-label {
    font-size: 11px;
    color: var(--text-secondary);
}

.classroom-list-section {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: 24px;
    flex-grow: 1;
    overflow-y: auto;
}

.classroom-list-section h4 {
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 16px;
}

.classroom-sessions-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.cr-session-card {
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    padding: 16px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition-fast);
}

.cr-session-card:hover {
    background-color: var(--bg-primary);
}

.cr-session-left {
    display: flex;
    align-items: center;
    gap: 16px;
}

.cr-session-index {
    font-size: 12px;
    color: var(--text-muted);
}

.cr-session-name {
    font-weight: 500;
    font-size: 13px;
}

.cr-session-time {
    font-size: 11px;
    color: var(--text-muted);
}

.cr-session-status {
    font-size: 11px;
    padding: 3px 8px;
    border-radius: 4px;
    font-weight: 500;
}
.cr-session-status.live {
    background-color: var(--color-accent-light);
    color: var(--color-accent);
    animation: pulse 2s infinite;
}
.cr-session-status.ended {
    background-color: var(--bg-primary);
    color: var(--text-secondary);
}

/* ==========================================
   12. R8 学习轨迹子页面样式
   ========================================= */
.trajectory-layout {
    display: flex;
    flex-direction: column;
    gap: 24px;
    height: 100%;
}

.trajectory-header {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    padding: 16px 24px;
    display: flex;
    align-items: center;
    gap: 20px;
}

.play-controls {
    display: flex;
    align-items: center;
    gap: 10px;
}

.btn-icon {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background-color: var(--bg-primary);
    color: var(--text-secondary);
    display: flex;
    justify-content: center;
    align-items: center;
    transition: var(--transition-fast);
}
.btn-icon:hover {
    background-color: var(--color-primary-light);
    color: var(--color-primary);
}

.playback-speed {
    font-size: 11px;
    color: var(--text-muted);
}

.progress-bar-container-traj {
    flex-grow: 1;
}

.traj-slider {
    width: 100%;
    -webkit-appearance: none;
    height: 4px;
    background: var(--border-color);
    outline: none;
    border-radius: 2px;
}
.traj-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--color-primary);
    cursor: pointer;
    transition: var(--transition-fast);
}

.trajectory-grid {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 24px;
    flex-grow: 1;
    height: calc(100% - 100px);
}

.traj-timeline-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: 24px;
    overflow-y: auto;
    height: 100%;
}

.traj-timeline-card h4, .traj-story-card h4 {
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 20px;
}

.timeline-wrapper {
    display: flex;
    flex-direction: column;
    gap: 16px;
    position: relative;
    padding-left: 20px;
}

.timeline-wrapper::before {
    content: "";
    position: absolute;
    left: 8px;
    top: 8px;
    bottom: 8px;
    width: 2px;
    background-color: var(--border-color);
}

.timeline-node {
    position: relative;
    z-index: 2;
    opacity: 0.5;
    transition: var(--transition-smooth);
}

.timeline-node.active {
    opacity: 1;
}

.timeline-node-dot {
    position: absolute;
    left: -16px;
    top: 6px;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background-color: #FFFFFF;
    border: 2px solid var(--text-muted);
}
.timeline-node.active .timeline-node-dot {
    background-color: var(--color-primary);
    border-color: var(--color-primary);
}

.timeline-node-content {
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    padding: 12px 16px;
}

.timeline-node.active .timeline-node-content {
    background-color: var(--color-primary-light);
    border-color: var(--color-primary);
}

.node-time {
    font-size: 10px;
    color: var(--text-muted);
}

.node-title {
    font-weight: 500;
    font-size: 12px;
    margin-bottom: 2px;
}

.node-desc {
    font-size: 11px;
    color: var(--text-secondary);
}

.traj-story-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: 24px;
    height: 100%;
}

.story-content {
    background-color: var(--bg-primary);
    border-radius: var(--border-radius-md);
    padding: 24px;
    position: relative;
    min-height: 200px;
}

.story-quote-icon {
    font-size: 24px;
    color: var(--text-muted);
    opacity: 0.3;
    position: absolute;
    top: 20px;
    left: 20px;
}

.story-content p {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.7;
    text-indent: 14px;
    margin-top: 14px;
}

/* ==========================================
   13. R9 学习报告子页面样式
   ========================================= */
.report-layout {
    display: flex;
    flex-direction: column;
    gap: 20px;
    height: 100%;
}

.report-header-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.report-tabs {
    display: flex;
    gap: 8px;
}

.rep-tab-btn {
    padding: 6px 14px;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    font-size: 12px;
    color: var(--text-secondary);
    transition: var(--transition-fast);
}

.rep-tab-btn:hover {
    border-color: var(--text-secondary);
}

.rep-tab-btn.active {
    background-color: var(--color-primary);
    border-color: var(--color-primary);
    color: #FFFFFF;
}

.report-content-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: 32px;
    flex-grow: 1;
    overflow-y: auto;
    min-height: 300px;
    position: relative;
}

.report-summary-view h4 {
    font-size: 16px;
    font-weight: 500;
    margin-bottom: 12px;
}

.report-summary-view p {
    font-size: 13px;
    line-height: 1.6;
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.report-stats-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.report-sub-card {
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    padding: 20px;
}

.report-sub-card h5 {
    font-size: 13px;
    font-weight: 500;
    margin-bottom: 12px;
}

.mock-chart-container {
    height: 100px;
    display: flex;
    align-items: flex-end;
    gap: 12px;
    padding-top: 20px;
}

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

.chart-bar-fill {
    width: 24px;
    background-color: var(--color-primary-light);
    border-radius: 4px 4px 0 0;
    transition: height 1s ease;
}

.chart-bar-wrapper:hover .chart-bar-fill {
    background-color: var(--color-primary);
}

.chart-bar-label {
    font-size: 9px;
    color: var(--text-muted);
}

/* ==========================================
   14. 左侧专属助教+搜索样式
   ========================================= */
.course-assistant-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    height: 100%;
    display: grid;
    grid-template-rows: 48px 54px 1fr 64px;
    overflow: hidden;
    box-shadow: var(--shadow-soft);
}

/* 课程本地搜索 */
.assistant-search-box {
    position: relative;
    padding: 10px 14px 0;
    display: flex;
    align-items: center;
}

.assistant-search-box i {
    position: absolute;
    left: 24px;
    color: var(--text-muted);
    font-size: 12px;
}

.assistant-search-box input {
    width: 100%;
    height: 32px;
    padding: 0 12px 0 28px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    font-size: 11px;
    outline: none;
    background-color: var(--bg-primary);
    transition: var(--transition-fast);
}

.assistant-search-box input:focus {
    background-color: #FFFFFF;
    border-color: var(--color-primary);
}

.local-search-results {
    position: absolute;
    top: 44px;
    left: 14px;
    right: 14px;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    box-shadow: var(--shadow-medium);
    z-index: 120;
    max-height: 200px;
    overflow-y: auto;
    padding: 6px 0;
}

.local-res-item {
    padding: 8px 12px;
    font-size: 11px;
    cursor: pointer;
    transition: var(--transition-fast);
    border-bottom: 1px solid var(--bg-primary);
}
.local-res-item:last-child {
    border-bottom: none;
}
.local-res-item:hover {
    background-color: var(--color-primary-light);
    color: var(--color-primary);
}

.assistant-header {
    border-bottom: 1px solid var(--border-color);
    padding: 0 20px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.assist-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background-color: var(--color-secondary-light);
    color: var(--color-secondary);
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 13px;
}

.assist-title-meta h4 {
    font-size: 13px;
    font-weight: 500;
}

.assist-context {
    font-size: 10px;
    color: var(--text-muted);
}

.assistant-messages {
    padding: 20px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.assist-msg {
    display: flex;
    gap: 10px;
    max-width: 90%;
}

.assist-msg.bot {
    align-self: flex-start;
}

.assist-msg.student {
    align-self: flex-end;
    flex-direction: row-reverse;
}

.assist-bubble {
    padding: 10px 14px;
    border-radius: var(--border-radius-md);
    font-size: 12px;
}

.bot .assist-bubble {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    border-top-left-radius: 0;
}

.student .assist-bubble {
    background-color: var(--color-secondary-light);
    color: var(--color-secondary);
    border-top-right-radius: 0;
}

.assistant-input-area {
    border-top: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    padding: 0 16px;
}

.assistant-input-area input {
    flex-grow: 1;
    height: 100%;
    border: none;
    outline: none;
    font-size: 12px;
}

/* ==========================================
   15. R10 作业中心视图样式
   ========================================= */
.task-center-header {
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 20px;
}

.task-center-header h2 {
    font-size: 18px;
    font-weight: 400;
}

.task-filters {
    display: flex;
    gap: 8px;
}

.filter-btn {
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 12px;
    color: var(--text-secondary);
    background-color: var(--bg-primary);
    border: 1px solid transparent;
    transition: var(--transition-fast);
}

.filter-btn:hover {
    color: var(--text-primary);
}

.filter-btn.active {
    background-color: var(--color-primary-light);
    color: var(--color-primary);
    border-color: var(--color-primary);
    font-weight: 500;
}

.tasks-list-container {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-top: 24px;
}

.task-item-card {
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    padding: 20px 24px;
    display: grid;
    grid-template-columns: 1fr 120px 100px 100px;
    align-items: center;
    gap: 16px;
    transition: var(--transition-fast);
}

.task-item-card:hover {
    border-color: var(--color-primary);
    background-color: rgba(122, 142, 154, 0.02);
}

.task-card-info h4 {
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 4px;
}

.task-card-info p {
    font-size: 11px;
    color: var(--text-muted);
}

.task-card-due {
    font-size: 12px;
    color: var(--text-secondary);
}

.task-card-status {
    font-size: 11px;
    font-weight: 500;
    padding: 4px 10px;
    border-radius: 20px;
    text-align: center;
    width: fit-content;
}
.task-card-status.pending {
    background-color: var(--color-accent-light);
    color: var(--color-accent);
}
.task-card-status.grading {
    background-color: var(--color-primary-light);
    color: var(--color-primary);
}
.task-card-status.completed {
    background-color: var(--color-secondary-light);
    color: var(--color-secondary);
}
.task-card-status.overdue {
    background-color: var(--color-danger);
    color: #FFFFFF;
}

.btn-task-action {
    background-color: var(--color-primary);
    color: #FFFFFF;
    height: 32px;
    border-radius: var(--border-radius-sm);
    font-size: 12px;
    font-weight: 500;
    transition: var(--transition-fast);
}
.btn-task-action:hover {
    background-color: var(--color-primary-hover);
}

/* 作业作答侧边抽屉 */
.task-drawer {
    position: fixed;
    top: 0;
    right: 0;
    width: 480px;
    height: 100%;
    background-color: var(--bg-card);
    border-left: 1px solid var(--border-color);
    box-shadow: -10px 0 30px rgba(0, 0, 0, 0.05);
    z-index: 200;
    display: grid;
    grid-template-rows: 64px 1fr 80px;
    animation: slideInRight 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.drawer-header {
    border-bottom: 1px solid var(--border-color);
    padding: 0 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.drawer-header h3 {
    font-size: 15px;
    font-weight: 500;
}

.drawer-body {
    padding: 24px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.task-question-box {
    background-color: var(--bg-primary);
    border-radius: var(--border-radius-md);
    padding: 16px;
}

.task-question-box h4 {
    font-size: 13px;
    font-weight: 500;
    margin-bottom: 6px;
}

.task-question-box p {
    font-size: 12px;
    color: var(--text-secondary);
    line-height: 1.6;
}

.task-answer-area {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.task-answer-area label {
    font-size: 12px;
    color: var(--text-secondary);
}

.task-answer-area textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    outline: none;
    font-family: inherit;
    font-size: 13px;
    resize: none;
    transition: var(--transition-fast);
}

.task-answer-area textarea:focus {
    border-color: var(--color-primary);
}

.image-upload-wrapper {
    background-color: var(--bg-primary);
    border-radius: var(--border-radius-md);
    padding: 14px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-top: 10px;
}

.upload-label {
    font-size: 11px;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 6px;
}

.upload-status {
    font-size: 10px;
    color: var(--text-muted);
}

/* AI 预批改 */
.ai-grading-preview {
    background-color: var(--color-secondary-light);
    border: 1px dashed var(--color-secondary);
    border-radius: var(--border-radius-md);
    padding: 16px;
    animation: fadeIn 0.3s ease;
}

.ai-grade-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
}

.ai-badge {
    font-size: 12px;
    font-weight: 500;
    color: var(--color-secondary);
}

.ai-score {
    font-size: 12px;
    font-weight: 500;
    color: var(--color-primary);
}

.ai-feedback-text {
    font-size: 11px;
    color: var(--text-secondary);
    line-height: 1.6;
}

.drawer-footer {
    border-top: 1px solid var(--border-color);
    padding: 0 24px;
    display: flex;
    justify-content: flex-end;
    align-items: center;
    gap: 12px;
}

.drawer-footer button {
    height: 40px;
    padding: 0 24px;
    border-radius: var(--border-radius-md);
    font-size: 13px;
}

/* ==========================================
   16. R11 全局 AI 助手 (悬浮挂件与抽屉)
   ========================================= */
#global-ai-assistant {
    position: fixed;
    bottom: 32px;
    right: 32px;
    z-index: 500;
}

.ai-bubble-btn {
    width: 52px;
    height: 52px;
    border-radius: 50%;
    background-color: var(--color-primary);
    color: #FFFFFF;
    font-size: 20px;
    display: flex;
    justify-content: center;
    align-items: center;
    box-shadow: 0 8px 30px rgba(122, 142, 154, 0.4);
    position: relative;
    transition: var(--transition-smooth);
}

.ai-bubble-btn:hover {
    background-color: var(--color-primary-hover);
    transform: scale(1.08) rotate(10deg);
}

.bubble-tooltip {
    position: absolute;
    right: 64px;
    background-color: var(--text-primary);
    color: #FFFFFF;
    font-size: 11px;
    padding: 4px 10px;
    border-radius: 4px;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transform: translateX(10px);
    transition: var(--transition-fast);
}
.ai-bubble-btn:hover .bubble-tooltip {
    opacity: 0.9;
    transform: translateX(0);
}

.ai-panel {
    position: absolute;
    bottom: 64px;
    right: 0;
    width: 360px;
    height: 480px;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-medium);
    display: grid;
    grid-template-rows: 54px 1fr 54px;
    overflow: hidden;
    animation: fadeInUp 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.ai-panel-header {
    background-color: var(--color-primary-light);
    border-bottom: 1px solid var(--border-color);
    padding: 0 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header-info {
    font-weight: 500;
    color: var(--color-primary);
    font-size: 13px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.ai-panel-body {
    padding: 16px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.ai-msg {
    display: flex;
    gap: 8px;
    max-width: 85%;
}

.ai-msg.bot {
    align-self: flex-start;
}

.ai-msg.user {
    align-self: flex-end;
    flex-direction: row-reverse;
}

.ai-msg-avatar {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background-color: var(--color-primary-light);
    color: var(--color-primary);
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 10px;
}

.ai-msg-text {
    padding: 8px 12px;
    border-radius: var(--border-radius-md);
    font-size: 12px;
    line-height: 1.5;
}

.bot .ai-msg-text {
    background-color: var(--bg-primary);
}

.user .ai-msg-text {
    background-color: var(--color-primary-light);
    color: var(--color-primary);
}

.ai-panel-footer {
    border-top: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    padding: 0 12px;
}

.ai-panel-footer input {
    flex-grow: 1;
    height: 100%;
    border: none;
    outline: none;
    font-size: 12px;
}

/* ==========================================
   17. FE-11 统一状态组件样式 & 调试面板
   ========================================= */
#state-sandbox-widget {
    position: fixed;
    bottom: 32px;
    left: 32px;
    z-index: 500;
}

.sandbox-toggle-btn {
    background-color: var(--text-secondary);
    color: #FFFFFF;
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 12px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    display: flex;
    align-items: center;
    gap: 8px;
    transition: var(--transition-fast);
}
.sandbox-toggle-btn:hover {
    background-color: var(--text-primary);
    transform: translateY(-1px);
}

.sandbox-modal {
    position: absolute;
    bottom: 44px;
    left: 0;
    width: 280px;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-medium);
    overflow: hidden;
    animation: fadeInUp 0.3s ease;
}

.sandbox-header {
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    padding: 10px 14px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.sandbox-header h4 {
    font-size: 12px;
    font-weight: 500;
}

.sandbox-body {
    padding: 14px;
}
.sandbox-body .desc {
    font-size: 10px;
    color: var(--text-secondary);
    margin-bottom: 10px;
}

.sandbox-btns {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.sandbox-btns button {
    text-align: left;
    justify-content: flex-start;
    padding: 6px 12px;
}

/* 统一状态组件页面样式 */

/* 加载中状态 (FE-11 Skeleton) */
.loading-state-view {
    display: flex;
    flex-direction: column;
    gap: 16px;
    padding: 24px;
}

.skeleton {
    background: linear-gradient(90deg, #E2E7EB 25%, #ECEFF2 50%, #E2E7EB 75%);
    background-size: 200% 100%;
    animation: skeleton-loading 1.4s ease infinite;
    border-radius: 4px;
}
.skeleton-title {
    width: 40%;
    height: 18px;
    margin-bottom: 12px;
}
.skeleton-text {
    width: 100%;
    height: 12px;
}
.skeleton-box {
    width: 100%;
    height: 140px;
    border-radius: 8px;
}

@keyframes skeleton-loading {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* 错误状态 (FE-11 Error) */
.error-state-view {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 48px 24px;
    text-align: center;
}

.error-state-view i {
    font-size: 44px;
    color: var(--color-danger);
    margin-bottom: 16px;
}

.error-state-view h4 {
    font-size: 15px;
    font-weight: 500;
    margin-bottom: 6px;
}

.error-state-view p {
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: 16px;
}

/* 无权限状态 (FE-11 No Auth) */
.no-auth-state-view {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 56px 24px;
    text-align: center;
}

.no-auth-state-view i {
    font-size: 44px;
    color: var(--color-accent);
    margin-bottom: 16px;
}

.no-auth-state-view h4 {
    font-size: 15px;
    font-weight: 500;
    margin-bottom: 6px;
}

.no-auth-state-view p {
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: 16px;
}

/* 空状态 (FE-11 Empty) */
.empty-state {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 48px;
    text-align: center;
    color: var(--text-muted);
}
.empty-state i {
    font-size: 36px;
    margin-bottom: 12px;
    color: var(--border-color);
}
.empty-state p {
    font-size: 13px;
}

/* ==========================================
   18. 提示消息与全局提示
   ========================================= */
#toast-container {
    position: fixed;
    top: 24px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.toast {
    background-color: var(--text-primary);
    color: #FFFFFF;
    padding: 10px 20px;
    border-radius: 20px;
    font-size: 12px;
    display: flex;
    align-items: center;
    gap: 10px;
    box-shadow: var(--shadow-medium);
    animation: fadeInDown 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.toast.success i {
    color: var(--color-secondary);
}

/* 加载旋钮 */
.spinner {
    width: 24px;
    height: 24px;
    border: 2px solid var(--border-color);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin: 20px auto;
}

/* ==========================================
   19. 动画关键帧 (Keyframes)
   ========================================= */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

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

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px) translateX(-50%);
    }
    to {
        opacity: 1;
        transform: translateY(0) translateX(-50%);
    }
}

@keyframes slideInRight {
    from {
        transform: translateX(100%);
    }
    to {
        transform: translateX(0);
    }
}

@keyframes pulse {
    0% {
        box-shadow: 0 0 0 0 rgba(196, 156, 148, 0.4);
    }
    70% {
        box-shadow: 0 0 0 8px rgba(196, 156, 148, 0);
    }
    100% {
        box-shadow: 0 0 0 0 rgba(196, 156, 148, 0);
    }
}

@keyframes spin {
    to { transform: rotate(360deg); }
}