/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: #ffffff;
    min-height: 100vh;
    color: #333;
}

.container {
    display: flex;
    min-height: 100vh;
}

/* 侧边栏样式 */
.sidebar {
    width: 250px;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(15px);
    padding: 20px 0;
    box-shadow: 2px 0 20px rgba(0, 0, 0, 0.15);
    position: fixed;
    height: 100vh;
    overflow-y: auto;
    left: 0;
    top: 0;
    z-index: 1000;
    display: block;
    border-right: 1px solid rgba(102, 126, 234, 0.1);
}

.logo {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    padding: 20px 20px 15px 20px;
    margin-bottom: 15px;
}

.logo-image {
    max-width: 200px;
    height: auto;
    max-height: 80px;
    object-fit: contain;
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 12px;
}

.logo-icon i {
    color: white;
    font-size: 20px;
}

.logo-text {
    font-size: 24px;
    font-weight: 700;
    background: linear-gradient(135deg, #667eea, #764ba2);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    list-style: none;
    padding: 0;
}

.nav-divider {
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(102, 126, 234, 0.3), transparent);
    margin: 15px 20px;
    position: relative;
}



.nav-item {
    margin-bottom: 5px;
}

.nav-item a {
    display: flex;
    align-items: center;
    padding: 12px 20px;
    text-decoration: none;
    color: #666;
    transition: all 0.3s ease;
    border-radius: 0 25px 25px 0;
    margin-right: 20px;
}

.nav-item a:hover {
    background: rgba(102, 126, 234, 0.1);
    color: #667eea;
    transform: translateX(5px);
    box-shadow: 0 3px 10px rgba(102, 126, 234, 0.2);
}

.nav-item a:hover i {
    transform: scale(1.1);
}

.nav-item.active a {
    background: #6366f1;
    color: white;
    transform: translateX(5px);
    box-shadow: 0 3px 10px rgba(99, 102, 241, 0.3);
}

.nav-item.active a i {
    color: white !important;
    transform: scale(1.1);
}

.nav-item i {
    width: 20px;
    margin-right: 12px;
    font-size: 16px;
    transition: all 0.3s ease;
}

/* 统一深灰色图标样式 */
.nav-item a[href="index.html"] i,
.nav-item a[href="pbl-partner.html"] i,
.nav-item a[href="pbl-cotutor.html"] i,
.nav-item a[href="student.html"] i,
.nav-item a[href="biology.html"] i,
.nav-item a[href="about.html"] i {
    color: #555555; /* 深灰色 */
}

/* 主内容区域 */
.main-content {
    flex: 1;
    margin-left: 270px;
    margin-top: 20px;
    margin-right: 20px;
    margin-bottom: 20px;
    padding: 40px;
}

.page-header {
    text-align: center;
    margin-bottom: 40px;
    padding: 40px 0;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1), rgba(118, 75, 162, 0.1));
    border-radius: 20px;
    position: relative;
    overflow: hidden;
}

.page-header::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(102, 126, 234, 0.1) 0%, transparent 70%);
    animation: float 6s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    50% { transform: translate(-20px, -20px) rotate(180deg); }
}

.page-header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, #667eea, #764ba2);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 15px;
    position: relative;
    z-index: 1;
}

.page-header .subtitle {
    font-size: 1.1rem;
    color: #666;
    max-width: 800px;
    margin: 0 auto;
    line-height: 1.6;
    position: relative;
    z-index: 1;
}

/* 卡片网格 */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin-top: 30px;
}

@media (max-width: 768px) {
    .cards-grid {
        grid-template-columns: 1fr;
    }
}

@media (min-width: 769px) and (max-width: 1200px) {
    .cards-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1201px) and (max-width: 1600px) {
    .cards-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (min-width: 1601px) and (max-width: 2000px) {
    .cards-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

@media (min-width: 2001px) {
    .cards-grid {
        grid-template-columns: repeat(5, 1fr);
    }
}

.card {
    background: white;
    border-radius: 15px;
    padding: 25px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    border: 1px solid rgba(102, 126, 234, 0.1);
    position: relative;
    overflow: hidden;
}

/* 长条状卡片样式 - 参考风格优化 */
.card-horizontal {
    display: flex;
    align-items: center;
    padding: 16px 20px;
    background: #ffffff;
    border-radius: 12px;
    border: 1px solid #e8e8e8;
    transition: all 0.2s ease;
    min-height: 80px;
    gap: 16px;
}

.card-logo {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.card-logo img {
    width: 40px;
    height: 40px;
    object-fit: contain;
}

.card-horizontal .card-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    text-align: left;
    min-width: 0;
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 4px;
}

.card-horizontal .card-content h3 {
    margin: 0;
    font-size: 16px;
    font-weight: 600;
    color: #333333;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.card-clicks {
    font-size: 14px;
    color: #999999;
    margin-left: 8px;
    flex-shrink: 0;
}

.card-horizontal .card-content p {
    margin: 0;
    color: #666666;
    line-height: 1.4;
    font-size: 14px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    text-overflow: ellipsis;
}



.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(102, 126, 234, 0.2);
}

.card a {
    text-decoration: none;
    color: inherit;
    display: block;
    width: 100%;
    height: 100%;
    position: relative;
    z-index: 1;
}

.card a:hover {
    text-decoration: none;
    color: inherit;
}

.card-icon {
    width: 50px;
    height: 50px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 15px;
}

.card-icon i {
    font-size: 24px;
    color: white;
}

.card-icon.green {
    background: linear-gradient(135deg, #4CAF50, #45a049);
}

.card-icon.blue {
    background: linear-gradient(135deg, #2196F3, #1976D2);
}

.card-icon.teal {
    background: linear-gradient(135deg, #009688, #00796B);
}

.card-icon.light-blue {
    background: linear-gradient(135deg, #03A9F4, #0288D1);
}

.card-icon.cyan {
    background: linear-gradient(135deg, #00BCD4, #0097A7);
}

.card-icon.blue-dark {
    background: linear-gradient(135deg, #3F51B5, #303F9F);
}

.card-icon.orange {
    background: linear-gradient(135deg, #FF9800, #F57C00);
}

.card-content h3 {
    font-size: 1.3rem;
    font-weight: 600;
    color: #333;
    margin-bottom: 10px;
}

.card-stats {
    display: flex;
    align-items: center;
    margin-bottom: 15px;
}

.card-horizontal .card-stats {
    margin-bottom: 0;
}

.card-stats .views {
    display: flex;
    align-items: center;
    color: #999;
    font-size: 0.9rem;
}

.card-stats .views i {
    margin-right: 5px;
    font-size: 14px;
}

.card-content p {
    color: #666;
    line-height: 1.6;
    margin-bottom: 20px;
    font-size: 0.95rem;
}

.card-link {
    display: inline-flex;
    align-items: center;
    padding: 8px 16px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    text-decoration: none;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.3s ease;
}

.card-link:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.3);
}

/* 详情页面内容区域样式 */
.back-button {
    margin-bottom: 1.5rem;
}

.back-button a {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: #667eea;
    text-decoration: none;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 25px;
    transition: all 0.3s ease;
    background: rgba(102, 126, 234, 0.1);
}

.back-button a:hover {
    background: rgba(102, 126, 234, 0.2);
    transform: translateX(-3px);
}

.detail-section {
    background: white;
    padding: 2rem;
    border-radius: 15px;
    margin-bottom: 2rem;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
}

.detail-section h2 {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    font-size: 1.5rem;
    color: #333;
    margin-bottom: 1.5rem;
    font-weight: 600;
}

.detail-section h2 i {
    color: #667eea;
}

.intro-content p {
    line-height: 1.8;
    color: #555;
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.feature-item {
    text-align: center;
    padding: 1.5rem;
    border-radius: 12px;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.05), rgba(118, 75, 162, 0.05));
    border: 1px solid rgba(102, 126, 234, 0.1);
    transition: all 0.3s ease;
}

.feature-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(102, 126, 234, 0.15);
}

.feature-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
    color: white;
    font-size: 1.5rem;
}

.feature-item h3 {
    font-size: 1.2rem;
    color: #333;
    margin-bottom: 0.8rem;
    font-weight: 600;
}

.feature-item p {
    color: #666;
    line-height: 1.6;
    font-size: 0.95rem;
}

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

.scenario-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    padding: 1.5rem;
    background: rgba(102, 126, 234, 0.05);
    border-radius: 12px;
    border-left: 4px solid #667eea;
}

.scenario-item i {
    color: #667eea;
    font-size: 1.5rem;
    margin-top: 0.2rem;
}

.scenario-item h4 {
    color: #333;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.scenario-item p {
    color: #666;
    line-height: 1.6;
    margin: 0;
}

.usage-steps {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.step-item {
    display: flex;
    align-items: flex-start;
    gap: 1.5rem;
}

.step-number {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 1.1rem;
    flex-shrink: 0;
}

.step-content h4 {
    color: #333;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.step-content p {
    color: #666;
    line-height: 1.6;
    margin: 0;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .sidebar {
        width: 200px;
    }
    
    .main-content {
        margin-left: 200px;
        padding: 20px;
    }
    
    .page-header h1 {
        font-size: 2rem;
    }
    
    .cards-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .detail-header {
        flex-direction: column;
        text-align: center;
        gap: 1.5rem;
    }
    
    .detail-info {
        flex-direction: column;
        align-items: center;
        text-align: center;
        gap: 1rem;
    }
    
    .detail-content h1 {
        font-size: 2rem;
    }
    
    .qr-section {
        order: -1;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .step-item {
        flex-direction: column;
        text-align: center;
        gap: 1rem;
    }
    
    .scenario-item {
        flex-direction: column;
        text-align: center;
        gap: 1rem;
    }
    
    .detail-section {
        padding: 1.5rem;
    }
}

/* 分类页面样式 */
.category-header {
    display: flex;
    align-items: center;
    padding: 30px;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1), rgba(118, 75, 162, 0.1));
    border-radius: 20px;
    margin-bottom: 30px;
}

.category-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 25px;
}

.category-icon i {
    font-size: 40px;
    color: white;
}

.category-info h1 {
    font-size: 2.2rem;
    font-weight: 700;
    color: #333;
    margin-bottom: 8px;
}

.category-description {
    font-size: 1.1rem;
    color: #666;
    margin: 0;
}

.category-cards {
    margin-bottom: 40px;
}

.empty-state {
    text-align: center;
    padding: 60px 20px;
    background: rgba(102, 126, 234, 0.05);
    border-radius: 20px;
    border: 2px dashed rgba(102, 126, 234, 0.2);
}

.empty-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1), rgba(118, 75, 162, 0.1));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
}

.empty-icon i {
    font-size: 36px;
    color: #667eea;
}

.empty-state h3 {
    font-size: 1.5rem;
    color: #333;
    margin-bottom: 10px;
}

.empty-state p {
    color: #666;
    font-size: 1rem;
}

/* 详情页面样式 */
.back-button {
    margin-bottom: 20px;
}

.back-button a {
    display: inline-flex;
    align-items: center;
    padding: 10px 20px;
    background: rgba(102, 126, 234, 0.1);
    color: #667eea;
    text-decoration: none;
    border-radius: 25px;
    font-weight: 500;
    transition: all 0.3s ease;
}

.back-button a:hover {
    background: rgba(102, 126, 234, 0.2);
    transform: translateX(-5px);
}

.back-button i {
    margin-right: 8px;
}

.detail-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 2rem;
    border-radius: 15px;
    margin-bottom: 2rem;
    box-shadow: 0 10px 30px rgba(102, 126, 234, 0.3);
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 2rem;
}

/* 简化详情页样式 */
.simple-detail-page {
    max-width: 1000px;
    margin: 0 auto;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* 主要信息框 - 三栏布局 */
.main-info-box {
    background: white;
    border-radius: 16px;
    padding: 30px;
    box-shadow: 0 6px 30px rgba(0, 0, 0, 0.1);
    display: flex;
    gap: 30px;
    align-items: flex-start;
}

/* Logo栏 */
.logo-column {
    flex-shrink: 0;
    width: 120px;
    display: flex;
    justify-content: center;
}

.main-logo {
    width: 100px;
    height: 100px;
    border-radius: 16px;
    object-fit: cover;
    box-shadow: 0 4px 15px rgba(139, 92, 246, 0.2);
}

/* 中间内容栏 */
.middle-column {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 18px;
    padding: 0 20px;
}

.detail-title {
    font-size: 32px;
    font-weight: bold;
    color: #333;
    margin-bottom: 5px;
}

/* 访问次数 */
.visit-count {
    display: flex;
    align-items: center;
    gap: 10px;
    color: #666;
    font-size: 15px;
}

.visit-count i {
    color: #8B5CF6;
    font-size: 16px;
}

.recommend-tag {
    background: linear-gradient(135deg, #EF4444, #DC2626);
    color: white;
    padding: 4px 12px;
    border-radius: 15px;
    font-size: 12px;
    font-weight: 600;
    box-shadow: 0 2px 8px rgba(239, 68, 68, 0.3);
}

/* 访问次数和按钮容器 */
.visit-count-with-button {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

/* 短简介 */
.short-intro {
    color: #555;
    line-height: 1.7;
    font-size: 16px;
    background: #f8f9ff;
    padding: 15px;
    border-radius: 12px;
    border-left: 4px solid #4338CA;
}

/* 网页链接 */
.web-link {
    display: flex;
    justify-content: flex-start;
}

.web-link-button {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: linear-gradient(135deg, #4338CA, #3730A3);
    color: white;
    padding: 14px 28px;
    border: none;
    border-radius: 30px;
    font-size: 15px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s ease;
    cursor: pointer;
    box-shadow: 0 4px 15px rgba(67, 56, 202, 0.3);
}

.web-link-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(67, 56, 202, 0.4);
    color: white;
    text-decoration: none;
}

/* 二维码栏 */
.qr-column {
    flex-shrink: 0;
    width: 180px;
}

.qr-container {
    text-align: center;
}

.qr-decoration {
    background: linear-gradient(135deg, #f1f5f9, #e2e8f0);
    border-radius: 16px;
    padding: 20px 20px 15px 20px;
    box-shadow: 0 4px 15px rgba(67, 56, 202, 0.1);
}

.qr-image {
    width: 120px;
    height: 120px;
    border-radius: 12px;
}

.qr-info {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    color: #666;
    font-size: 13px;
}

.qr-info .mobile-row {
    display: flex;
    align-items: center;
    gap: 6px;
}

.qr-info i {
    color: #4338CA;
    font-size: 16px;
}

.qr-info span {
    font-weight: 500;
}

.qr-info small {
    color: #999;
    font-size: 11px;
}

/* 下方简介框 */
.bottom-intro-box {
    background: white;
    border-radius: 16px;
    padding: 35px;
    box-shadow: 0 6px 30px rgba(0, 0, 0, 0.1);
}

.bottom-intro-box h3 {
    color: #333;
    font-size: 22px;
    font-weight: bold;
    margin-bottom: 25px;
    border-bottom: 3px solid #4338CA;
    padding-bottom: 12px;
}

.bottom-intro-box p {
    color: #555;
    line-height: 1.8;
    margin-bottom: 18px;
    text-align: justify;
    font-size: 15px;
}

.bottom-intro-box p:last-child {
    margin-bottom: 0;
}

.bottom-intro-box h4 {
    color: #4338CA;
    font-size: 18px;
    font-weight: bold;
    margin-top: 25px;
    margin-bottom: 15px;
    padding-left: 10px;
    border-left: 4px solid #4338CA;
}

.bottom-intro-box ul {
    margin: 15px 0;
    padding-left: 0;
    list-style: none;
}

.bottom-intro-box li {
    color: #555;
    line-height: 1.6;
    margin-bottom: 10px;
    padding-left: 25px;
    position: relative;
    font-size: 15px;
}

.bottom-intro-box li:before {
    content: "•";
    color: #4338CA;
    font-weight: bold;
    position: absolute;
    left: 8px;
    font-size: 16px;
}

.bottom-intro-box li:last-child {
    margin-bottom: 0;
}

.detail-info {
    display: flex;
    gap: 1.5rem;
    align-items: flex-start;
    flex: 1;
}

.agent-logo {
    position: relative;
    width: 80px;
    height: 80px;
    flex-shrink: 0;
}

.agent-logo img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 12px;
    border: 3px solid rgba(255, 255, 255, 0.3);
}

.detail-icon {
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    border: 3px solid rgba(255, 255, 255, 0.3);
}

.detail-content {
    flex: 1;
}

.detail-content h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    font-weight: 700;
}

.detail-stats {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
    align-items: center;
}

.detail-stats .views {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1rem;
    opacity: 0.9;
}

.detail-stats .tag {
    background: rgba(255, 255, 255, 0.2);
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 500;
}

.agent-slug {
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    opacity: 0.8;
    margin-bottom: 1rem;
    background: rgba(255, 255, 255, 0.1);
    padding: 0.5rem 0.8rem;
    border-radius: 8px;
    display: inline-block;
}

.agent-links {
    margin-top: 1rem;
}

.link-button {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(255, 255, 255, 0.2);
    color: white;
    text-decoration: none;
    padding: 0.8rem 1.5rem;
    border-radius: 25px;
    font-weight: 500;
    transition: all 0.3s ease;
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.link-button:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

.qr-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.qr-code {
    width: 120px;
    height: 120px;
    position: relative;
}

.qr-code img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 12px;
    border: 3px solid rgba(255, 255, 255, 0.3);
}

.qr-placeholder {
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 12px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    border: 3px solid rgba(255, 255, 255, 0.3);
}

.qr-placeholder i {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.qr-placeholder p {
    font-size: 0.8rem;
    margin: 0;
    opacity: 0.8;
}

.qr-text {
    font-size: 0.9rem;
    opacity: 0.9;
    margin: 0;
    text-align: center;
}

.detail-description {
    font-size: 1.1rem;
    line-height: 1.6;
    opacity: 0.95;
}

.detail-actions {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

.action-buttons {
    display: flex;
    flex-direction: column;
    gap: 15px;
    align-items: center;
}

.btn-primary {
    display: flex;
    align-items: center;
    padding: 12px 24px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    border: none;
    border-radius: 25px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.3);
}

.btn-primary i {
    margin-right: 8px;
}

.mobile-app {
    display: flex;
    flex-direction: column;
    align-items: center;
    color: #667eea;
    font-size: 0.9rem;
}

.mobile-app i {
    font-size: 24px;
    margin-bottom: 5px;
}

.mobile-app small {
    color: #999;
    font-size: 0.8rem;
}

.detail-section {
    background: white;
    padding: 30px;
    border-radius: 20px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
    margin-bottom: 25px;
}

.detail-section h2 {
    font-size: 1.5rem;
    font-weight: 600;
    color: #333;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid rgba(102, 126, 234, 0.1);
}

.intro-content p {
    color: #666;
    line-height: 1.8;
    font-size: 1rem;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.feature-item {
    padding: 20px;
    background: rgba(102, 126, 234, 0.05);
    border-radius: 15px;
    text-align: center;
}

.feature-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 15px;
}

.feature-icon i {
    font-size: 24px;
    color: white;
}

.feature-item h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: #333;
    margin-bottom: 10px;
}

.feature-item p {
    color: #666;
    font-size: 0.9rem;
    line-height: 1.5;
}

.scenarios {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.scenario-item {
    display: flex;
    align-items: flex-start;
    padding: 20px;
    background: rgba(102, 126, 234, 0.05);
    border-radius: 15px;
}

.scenario-item i {
    font-size: 24px;
    color: #667eea;
    margin-right: 15px;
    margin-top: 5px;
}

.scenario-item h4 {
    font-size: 1.1rem;
    font-weight: 600;
    color: #333;
    margin-bottom: 5px;
}

.scenario-item p {
    color: #666;
    font-size: 0.9rem;
    line-height: 1.5;
}

/* 关于页面样式 */
.about-header {
    text-align: center;
    margin-bottom: 40px;
}

.about-header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, #667eea, #764ba2);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.about-intro {
    text-align: center;
    margin-bottom: 50px;
    padding: 30px;
    background: #F8F9FC;
    border-radius: 20px;
}

.intro-text {
    font-size: 1.2rem;
    color: #333;
    line-height: 1.8;
    max-width: 800px;
    margin: 0 auto;
}

.about-sections {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 25px;
    margin-bottom: 50px;
}

.about-section {
    padding: 30px;
    border-radius: 20px;
    color: white;
    position: relative;
    overflow: hidden;
}

.about-section::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
    animation: float 8s ease-in-out infinite;
}

.purple-bg {
    background: #6A5ACD;
}

.pink-bg {
    background: #00A9A5;
}

.blue-bg {
    background: #4A90E2;
}

.section-content {
    position: relative;
    z-index: 1;
}

.section-content h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 15px;
}

.section-content p {
    font-size: 1rem;
    line-height: 1.6;
    opacity: 0.95;
}

.platform-features {
    margin-bottom: 50px;
}

.platform-features h2 {
    text-align: center;
    font-size: 2rem;
    font-weight: 600;
    color: #333;
    margin-bottom: 40px;
}

.features-showcase {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.feature-card {
    background: white;
    padding: 40px 30px;
    border-radius: 20px;
    text-align: center;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px rgba(102, 126, 234, 0.2);
}

.feature-icon-large {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
}

.feature-icon-large i {
    font-size: 36px;
    color: white;
}

.feature-card h3 {
    font-size: 1.3rem;
    font-weight: 600;
    color: #333;
    margin-bottom: 15px;
}

.feature-card p {
    color: #666;
    line-height: 1.6;
    font-size: 1rem;
}

.contact-section {
    background: white;
    padding: 40px;
    border-radius: 20px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
    margin-bottom: 30px;
}

.contact-section h2 {
    text-align: center;
    font-size: 1.8rem;
    font-weight: 600;
    color: #333;
    margin-bottom: 30px;
}

.contact-info {
    display: flex;
    justify-content: center;
    gap: 40px;
    flex-wrap: wrap;
}

.contact-item {
    display: flex;
    align-items: center;
    color: #666;
    font-size: 1rem;
}

.contact-item i {
    font-size: 20px;
    color: #667eea;
    margin-right: 10px;
}

.about-footer {
    text-align: center;
    padding: 20px;
    color: #999;
    font-size: 0.9rem;
}

@media (max-width: 768px) {
    .sidebar {
        width: 100%;
        height: auto;
        position: relative;
    }
    
    .main-content {
        margin-left: 0;
        margin: 10px;
        border-radius: 20px;
    }
    
    .container {
        flex-direction: column;
    }
    
    .page-header {
        padding: 20px;
    }
    
    .page-header h1 {
        font-size: 1.8rem;
    }
    
    .detail-header {
        flex-direction: column;
        text-align: center;
    }
    
    .detail-info {
        margin-right: 0;
        margin-bottom: 30px;
    }
    
    .about-sections {
        grid-template-columns: 1fr;
    }
    
    .contact-info {
        flex-direction: column;
        gap: 20px;
    }
}