/* Modern Layout CSS - 统一样式文件 */

:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --accent-color: #e74c3c;
    --success-color: #27ae60;
    --warning-color: #f39c12;
    --background-light: #f8f9fa;
    --text-dark: #2c3e50;
    --text-light: #6c757d;
    --card-shadow: 0 4px 20px rgba(0,0,0,0.08);
    --card-shadow-hover: 0 8px 32px rgba(0,0,0,0.16);
    --border-radius: 16px;
    --transition-base: all 0.4s ease;
}

/* Hero Section - 英雄区样式 */
.hero-section {
    color: white;
    padding: 80px 0 60px 0;
    margin-top: 76px; /* 导航栏高度 */
    position: relative;
    overflow: hidden;
}

.hero-section.airline {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.hero-section.energy {
    background: linear-gradient(135deg, #27ae60 0%, #2ecc71 50%, #f39c12 100%);
}

.hero-section.home {
    background: linear-gradient(rgba(0,0,0,0.4), rgba(0,0,0,0.4)), url('/static/images/background.svg');
    background-size: cover;
    background-position: center;
    padding: 120px 0 80px 0;
}

.hero-title {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 1rem;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
    font-family: '楷体', 'KaiTi', serif;
}

.hero-subtitle {
    font-size: 1.2rem;
    opacity: 0.9;
    margin-bottom: 2rem;
    letter-spacing: 2px;
}

.hero-description {
    font-size: 1.1rem;
    line-height: 1.8;
    max-width: 800px;
    margin: 0 auto;
    letter-spacing: 1px;
}

.hero-content {
    text-align: center;
}

/* Section Styles - 区块样式 */
.solutions-section,
.research-section,
.projects-section {
    padding: 80px 0;
    background: var(--background-light);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 600;
    color: var(--text-dark);
    text-align: center;
    margin-bottom: 3rem;
    position: relative;
}

.section-title::after {
    content: '';
    width: 80px;
    height: 4px;
    background: linear-gradient(90deg, var(--secondary-color), var(--accent-color));
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    border-radius: 2px;
}

/* Card Styles - 卡片样式 */
.solution-card,
.research-card,
.project-item {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--card-shadow);
    transition: var(--transition-base);
    overflow: hidden;
    margin-bottom: 2rem;
    height: 100%;
    position: relative;
}

.solution-card:hover,
.research-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--card-shadow-hover);
}

.card-image-wrapper {
    position: relative;
    overflow: hidden;
    height: 220px;
}

.card-image,
.research-card-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.solution-card:hover .card-image,
.research-card:hover .research-card-image {
    transform: scale(1.05);
}

.card-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg, rgba(52, 152, 219, 0.8), rgba(231, 76, 60, 0.8));
    opacity: 0;
    transition: opacity 0.4s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.energy .card-overlay {
    background: linear-gradient(45deg, rgba(39, 174, 96, 0.8), rgba(243, 156, 18, 0.8));
}

.solution-card:hover .card-overlay {
    opacity: 1;
}

.overlay-icon {
    color: white;
    font-size: 3rem;
}

.card-content,
.research-card-content {
    padding: 2rem;
}

.card-title,
.research-card-title {
    font-size: 1.4rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 1rem;
    text-decoration: none;
}

.card-title a,
.research-card-title a {
    color: inherit;
    text-decoration: none;
    transition: color 0.3s ease;
}

.card-title a:hover,
.research-card-title a:hover {
    color: var(--secondary-color);
}

.card-description,
.research-card-description {
    color: var(--text-light);
    font-size: 1rem;
    line-height: 1.6;
    margin-bottom: 1.5rem;
}

/* Button Styles - 按钮样式 */
.card-button {
    background: linear-gradient(45deg, var(--secondary-color), var(--accent-color));
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 25px;
    font-weight: 500;
    text-decoration: none;
    display: inline-block;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(52, 152, 219, 0.3);
}

.card-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(52, 152, 219, 0.4);
    color: white;
}

.card-button.inactive {
    background: linear-gradient(45deg, #95a5a6, #7f8c8d);
    box-shadow: 0 4px 15px rgba(149, 165, 166, 0.3);
    cursor: not-allowed;
}

.card-button.inactive:hover {
    transform: none;
    box-shadow: 0 4px 15px rgba(149, 165, 166, 0.3);
}

/* Project Styles - 项目样式 */
.project-item {
    border: 1px solid #e9ecef;
    transition: all 0.3s ease;
}

.project-item:hover {
    border-color: var(--secondary-color);
    box-shadow: var(--card-shadow-hover);
}

.project-title {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 1rem;
    padding: 1.5rem 1.5rem 0;
}

.project-details {
    padding: 0 1.5rem 1.5rem;
    color: var(--text-light);
    line-height: 1.6;
}

.project-status {
    display: inline-block;
    padding: 0.3rem 0.8rem;
    border-radius: 15px;
    font-size: 0.8rem;
    font-weight: 500;
    margin-left: 1rem;
}

.status-ongoing {
    background: #e8f5e8;
    color: var(--success-color);
}

.status-completed {
    background: #e3f2fd;
    color: #2196f3;
}

.coming-soon {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: linear-gradient(45deg, #e74c3c, #c0392b);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
    z-index: 10;
}

/* Statistics Section - 统计区样式 */
.stats-section {
    background: var(--primary-color);
    color: white;
    padding: 60px 0;
}

.stat-item {
    text-align: center;
    margin-bottom: 2rem;
}

.stat-number {
    font-size: 3rem;
    font-weight: 700;
    color: var(--secondary-color);
}

.stat-label {
    font-size: 1.1rem;
    opacity: 0.9;
}

/* Footer Styles - 页脚样式 */
.footer {
    background: var(--text-dark);
    color: white;
    padding: 2rem 0;
    text-align: center;
}

/* Animation Styles - 动画样式 */
.fade-in-up {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease-out;
}

.fade-in-up.animated {
    opacity: 1;
    transform: translateY(0);
}

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

/* Responsive Design - 响应式设计 */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-section {
        padding: 60px 0 40px 0;
    }
    
    .hero-section.home {
        padding: 80px 0 60px 0;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .solutions-section,
    .research-section,
    .projects-section {
        padding: 60px 0;
    }
    
    .card-title,
    .research-card-title {
        font-size: 1.2rem;
    }
    
    .stat-number {
        font-size: 2.5rem;
    }
}

/* Utility Classes - 工具类 */
.text-center {
    text-align: center;
}

.mb-0 {
    margin-bottom: 0;
}

.me-2 {
    margin-right: 0.5rem;
}

.g-4 > * {
    padding: 1rem;
}

/* Team Page Styles - 团队页面样式 */
.hero-section.team {
    background: linear-gradient(135deg, #2c3e50 0%, #34495e 50%, #3498db 100%);
}

/* Faculty Section - 教师区块 */
.faculty-section {
    padding: 80px 0;
    background: white;
}

.faculty-profile {
    margin-bottom: 2rem;
}

.profile-image-wrapper {
    position: relative;
    width: 280px;
    height: 280px;
    margin: 0 auto 2rem;
    border-radius: 50%;
    overflow: hidden;
    box-shadow: 0 8px 32px rgba(0,0,0,0.15);
    transition: var(--transition-base);
}

.profile-image-wrapper:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 40px rgba(0,0,0,0.25);
}

.profile-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.profile-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg, rgba(44, 62, 80, 0.8), rgba(52, 152, 219, 0.8));
    opacity: 0;
    transition: opacity 0.4s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    text-align: center;
}

.profile-image-wrapper:hover .profile-overlay {
    opacity: 1;
}

.profile-info h3 {
    font-size: 1.4rem;
    margin-bottom: 0.5rem;
}

.profile-info p {
    font-size: 1rem;
    opacity: 0.9;
}

.faculty-title {
    text-align: center;
}

.faculty-title .name {
    font-size: 1.8rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 0.5rem;
}

.faculty-title .position {
    font-size: 1.1rem;
    color: var(--text-light);
    margin-bottom: 0;
}

.faculty-bio {
    padding-left: 2rem;
}

.bio-content {
    margin-bottom: 2rem;
}

.bio-text {
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--text-dark);
    margin-bottom: 1.5rem;
    text-align: justify;
}

.section-subtitle {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    border-bottom: 2px solid var(--secondary-color);
    padding-bottom: 0.5rem;
}

.education-section,
.experience-section {
    margin-bottom: 2rem;
}

.timeline-list {
    list-style: none;
    padding: 0;
}

.timeline-item {
    position: relative;
    padding: 1rem 0 1rem 2rem;
    border-left: 2px solid var(--secondary-color);
    margin-bottom: 1rem;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -6px;
    top: 1.5rem;
    width: 10px;
    height: 10px;
    background: var(--secondary-color);
    border-radius: 50%;
}

.timeline-item .period {
    font-size: 0.9rem;
    color: var(--text-light);
    font-weight: 500;
}

.timeline-item .details {
    margin-top: 0.5rem;
    font-size: 1rem;
    color: var(--text-dark);
}

.link-button {
    display: inline-block;
    background: linear-gradient(45deg, var(--secondary-color), var(--accent-color));
    color: white;
    padding: 12px 24px;
    border-radius: 25px;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(52, 152, 219, 0.3);
}

.link-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(52, 152, 219, 0.4);
    color: white;
    text-decoration: none;
}

/* Students Section - 学生区块 */
.students-section {
    padding: 80px 0;
    background: var(--background-light);
}

.student-category {
    margin-bottom: 3rem;
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--card-shadow);
    padding: 2rem;
}

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

.category-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 0;
    padding: 1rem;
    background: linear-gradient(135deg, #f8f9fa, #e9ecef);
    border-radius: 12px;
    text-align: center;
}

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

.student-card {
    background: white;
    border: 1px solid #e9ecef;
    border-radius: 12px;
    padding: 1.5rem;
    text-align: center;
    transition: all 0.3s ease;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

.student-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.1);
    border-color: var(--secondary-color);
}

.student-name {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 0.5rem;
}

.student-year,
.student-department {
    font-size: 0.9rem;
    color: var(--text-light);
    margin-bottom: 0;
}

.team-photo {
    margin-top: 2rem;
    text-align: center;
}

.team-image {
    max-width: 100%;
    height: auto;
    border-radius: var(--border-radius);
    box-shadow: var(--card-shadow);
}

.photo-caption {
    margin-top: 1rem;
    font-size: 1rem;
    color: var(--text-light);
    font-style: italic;
}

/* Publications Section - 出版物区块 */
.publications-section {
    padding: 80px 0;
    background: white;
}

.publications-list {
    max-width: 1000px;
    margin: 0 auto;
}

.publication-item {
    display: flex;
    margin-bottom: 2rem;
    padding: 2rem;
    background: var(--background-light);
    border-radius: var(--border-radius);
    transition: all 0.3s ease;
    border-left: 4px solid var(--secondary-color);
}

.publication-item:hover {
    transform: translateX(5px);
    box-shadow: var(--card-shadow);
}

.publication-number {
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    background: linear-gradient(45deg, var(--secondary-color), var(--accent-color));
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    margin-right: 1.5rem;
    font-size: 1.1rem;
}

.publication-content {
    flex: 1;
}

.publication-text {
    font-size: 1rem;
    line-height: 1.6;
    color: var(--text-dark);
    margin-bottom: 0;
    text-align: justify;
}

.publication-text strong {
    color: var(--primary-color);
}

/* Responsive Design for Team Page - 团队页面响应式设计 */
@media (max-width: 768px) {
    .faculty-bio {
        padding-left: 0;
        margin-top: 2rem;
    }
    
    .profile-image-wrapper {
        width: 200px;
        height: 200px;
    }
    
    .faculty-title .name {
        font-size: 1.5rem;
    }
    
    .bio-text {
        font-size: 1rem;
    }
    
    .students-grid {
        grid-template-columns: 1fr;
    }
    
    .publication-item {
        flex-direction: column;
        text-align: center;
    }
    
    .publication-number {
        margin: 0 auto 1rem;
    }
}

/* Contact Page Styles - 联系页面样式 */
.hero-section.contact {
    background: linear-gradient(135deg, #27ae60 0%, #2ecc71 50%, #3498db 100%);
}

/* Contact Information Section - 联系信息区块 */
.contact-info-section {
    padding: 80px 0;
    background: var(--background-light);
}

.contact-card,
.contact-form-card {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--card-shadow);
    padding: 2.5rem;
    height: 100%;
    transition: var(--transition-base);
}

.contact-card:hover,
.contact-form-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--card-shadow-hover);
}

.contact-header {
    margin-bottom: 2rem;
    text-align: center;
    border-bottom: 2px solid var(--secondary-color);
    padding-bottom: 1rem;
}

.contact-title {
    font-size: 1.8rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.contact-subtitle {
    color: var(--text-light);
    font-size: 1rem;
    margin-bottom: 0;
}

.contact-details {
    margin-top: 2rem;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    margin-bottom: 2rem;
    padding: 1.5rem;
    background: var(--background-light);
    border-radius: 12px;
    transition: all 0.3s ease;
}

.contact-item:hover {
    background: #e8f5e8;
    transform: translateX(5px);
}

.contact-icon {
    flex-shrink: 0;
    width: 50px;
    height: 50px;
    background: linear-gradient(45deg, var(--secondary-color), var(--success-color));
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 1.5rem;
    font-size: 1.2rem;
}

.contact-content h4 {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.contact-content p {
    color: var(--text-dark);
    margin-bottom: 0.3rem;
    font-size: 1rem;
    line-height: 1.4;
}

.primary-email {
    font-weight: 600;
    color: var(--secondary-color) !important;
}

.secondary-email {
    font-size: 0.9rem;
    color: var(--text-light) !important;
}

/* Contact Form Styles - 联系表单样式 */
.contact-form {
    margin-top: 2rem;
}

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

.form-label {
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    display: block;
    font-size: 1rem;
}

.form-control {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid #e9ecef;
    border-radius: 8px;
    font-size: 1rem;
    transition: all 0.3s ease;
    background: white;
}

.form-control:focus {
    outline: none;
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

.form-control:hover {
    border-color: #bdc3c7;
}

.submit-button {
    background: linear-gradient(45deg, var(--success-color), var(--secondary-color));
    color: white;
    border: none;
    padding: 15px 30px;
    border-radius: 25px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    width: 100%;
    box-shadow: 0 4px 15px rgba(39, 174, 96, 0.3);
}

.submit-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(39, 174, 96, 0.4);
}

/* Location Section - 位置信息区块 */
.location-section {
    padding: 80px 0;
    background: white;
}

.map-container {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--card-shadow);
    overflow: hidden;
    height: 400px;
}

.map-placeholder {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #f8f9fa, #e9ecef);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.map-content {
    text-align: center;
    color: var(--primary-color);
}

.map-icon {
    font-size: 4rem;
    color: var(--secondary-color);
    margin-bottom: 1rem;
}

.map-content h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.map-content p {
    margin-bottom: 0.3rem;
    color: var(--text-light);
}

.location-info {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--card-shadow);
    padding: 2rem;
    height: 400px;
}

.location-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 2rem;
    text-align: center;
    border-bottom: 2px solid var(--secondary-color);
    padding-bottom: 1rem;
}

.transport-item {
    display: flex;
    align-items: center;
    margin-bottom: 1.5rem;
    padding: 1rem;
    background: var(--background-light);
    border-radius: 8px;
    transition: all 0.3s ease;
}

.transport-item:hover {
    background: #e8f5e8;
    transform: translateX(5px);
}

.transport-icon {
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    background: linear-gradient(45deg, var(--secondary-color), var(--success-color));
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 1rem;
    font-size: 1rem;
}

.transport-content h4 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 0.3rem;
}

.transport-content p {
    color: var(--text-dark);
    margin-bottom: 0;
    font-size: 0.9rem;
}

/* Research Areas Section - 研究领域区块 */
.research-areas-section {
    padding: 80px 0;
    background: var(--background-light);
}

.research-area-card {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--card-shadow);
    padding: 2rem;
    text-align: center;
    transition: var(--transition-base);
    height: 100%;
}

.research-area-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--card-shadow-hover);
}

.area-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(45deg, var(--secondary-color), var(--success-color));
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    font-size: 2rem;
    transition: all 0.3s ease;
}

.research-area-card:hover .area-icon {
    transform: scale(1.1);
}

.area-title {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.area-description {
    color: var(--text-light);
    line-height: 1.6;
    font-size: 1rem;
}

/* Responsive Design for Contact Page - 联系页面响应式设计 */
@media (max-width: 768px) {
    .contact-card,
    .contact-form-card {
        padding: 1.5rem;
    }
    
    .contact-item {
        flex-direction: column;
        text-align: center;
    }
    
    .contact-icon {
        margin: 0 auto 1rem;
    }
    
    .location-info {
        height: auto;
        margin-top: 2rem;
    }
    
    .map-container {
        height: 300px;
    }
    
    .transport-item {
        flex-direction: column;
        text-align: center;
    }
    
    .transport-icon {
        margin: 0 auto 0.5rem;
    }
}

/* Demo Page Styles - 演示页面样式 */
.hero-section.demo {
    background: linear-gradient(135deg, #8e44ad 0%, #3498db 50%, #e74c3c 100%);
}

/* Introduction Section - 介绍区块 */
.intro-section {
    padding: 80px 0;
    background: white;
}

.intro-content {
    padding-right: 2rem;
}

.intro-title {
    font-size: 2.2rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    line-height: 1.3;
}

.intro-text {
    font-size: 1.1rem;
    line-height: 1.7;
    color: var(--text-dark);
    margin-bottom: 1.5rem;
    text-align: justify;
}

.intro-stats {
    display: flex;
    gap: 2rem;
    margin-top: 2rem;
}

.stat-item {
    text-align: center;
}

.stat-item .stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--secondary-color);
    line-height: 1;
}

.stat-item .stat-label {
    font-size: 1rem;
    color: var(--text-light);
    margin-top: 0.5rem;
}

.intro-visual {
    padding-left: 2rem;
}

.visual-container {
    background: linear-gradient(135deg, #f8f9fa, #e9ecef);
    border-radius: var(--border-radius);
    padding: 3rem 2rem;
    box-shadow: var(--card-shadow);
}

.data-flow {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
}

.flow-item {
    background: white;
    border-radius: 12px;
    padding: 1.5rem;
    text-align: center;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.6s ease forwards;
    min-width: 150px;
}

.flow-item i {
    font-size: 2rem;
    color: var(--secondary-color);
    margin-bottom: 0.5rem;
}

.flow-item span {
    display: block;
    font-weight: 600;
    color: var(--text-dark);
}

.flow-arrow {
    font-size: 1.5rem;
    color: var(--secondary-color);
    font-weight: bold;
}

/* Demo Categories Section - 演示分类区块 */
.demo-categories-section {
    padding: 80px 0;
    background: var(--background-light);
}

.section-subtitle {
    text-align: center;
    font-size: 1.1rem;
    color: var(--text-light);
    margin-bottom: 3rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.demo-card {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--card-shadow);
    overflow: hidden;
    transition: var(--transition-base);
    height: 100%;
    position: relative;
}

.demo-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--card-shadow-hover);
}

.demo-card.coming-soon {
    filter: grayscale(30%);
}

.demo-image-wrapper {
    position: relative;
    height: 250px;
    overflow: hidden;
}

.demo-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.demo-card:hover .demo-image {
    transform: scale(1.05);
}

.demo-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg, rgba(142, 68, 173, 0.9), rgba(52, 152, 219, 0.9));
    opacity: 0;
    transition: opacity 0.4s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: white;
}

.demo-card:hover .demo-overlay {
    opacity: 1;
}

.overlay-content {
    padding: 2rem;
}

.overlay-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.overlay-text {
    font-size: 1.1rem;
    margin: 0;
    font-weight: 500;
}

.coming-soon-badge {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: linear-gradient(45deg, #e74c3c, #c0392b);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
    z-index: 10;
}

.demo-content {
    padding: 2rem;
}

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

.demo-title {
    font-size: 1.4rem;
    font-weight: 600;
    color: var(--text-dark);
    margin: 0;
}

.demo-status {
    padding: 0.3rem 0.8rem;
    border-radius: 15px;
    font-size: 0.8rem;
    font-weight: 500;
}

.demo-status.available {
    background: #e8f5e8;
    color: var(--success-color);
}

.demo-status.coming-soon {
    background: #fff3cd;
    color: #856404;
}

.demo-description {
    color: var(--text-light);
    line-height: 1.6;
    margin-bottom: 1.5rem;
    font-size: 1rem;
}

.demo-features {
    margin-bottom: 1.5rem;
}

.feature-tag {
    display: inline-block;
    background: var(--background-light);
    color: var(--text-dark);
    padding: 0.3rem 0.8rem;
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: 500;
    margin-right: 0.5rem;
    margin-bottom: 0.5rem;
    border: 1px solid #e9ecef;
}

.demo-button {
    background: linear-gradient(45deg, var(--secondary-color), #8e44ad);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 25px;
    font-weight: 500;
    text-decoration: none;
    display: inline-block;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(52, 152, 219, 0.3);
    width: 100%;
    text-align: center;
}

.demo-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(52, 152, 219, 0.4);
    color: white;
    text-decoration: none;
}

.demo-button.inactive {
    background: linear-gradient(45deg, #95a5a6, #7f8c8d);
    box-shadow: 0 4px 15px rgba(149, 165, 166, 0.3);
    cursor: not-allowed;
}

.demo-button.inactive:hover {
    transform: none;
    box-shadow: 0 4px 15px rgba(149, 165, 166, 0.3);
}

/* Technologies Section - 技术栈区块 */
.technologies-section {
    padding: 80px 0;
    background: white;
}

.tech-category {
    background: var(--background-light);
    border-radius: var(--border-radius);
    padding: 2rem;
    text-align: center;
    height: 100%;
    transition: var(--transition-base);
    border: 2px solid transparent;
}

.tech-category:hover {
    transform: translateY(-5px);
    border-color: var(--secondary-color);
    background: white;
    box-shadow: var(--card-shadow);
}

.tech-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(45deg, var(--secondary-color), #8e44ad);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    font-size: 2rem;
    transition: all 0.3s ease;
}

.tech-category:hover .tech-icon {
    transform: scale(1.1);
}

.tech-title {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
}

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

.tech-list li {
    padding: 0.5rem 0;
    color: var(--text-dark);
    font-size: 1rem;
    border-bottom: 1px solid #e9ecef;
    transition: color 0.3s ease;
}

.tech-list li:last-child {
    border-bottom: none;
}

.tech-category:hover .tech-list li {
    color: var(--secondary-color);
}

/* Responsive Design for Demo Page - 演示页面响应式设计 */
@media (max-width: 768px) {
    .intro-content {
        padding-right: 0;
        margin-bottom: 2rem;
    }
    
    .intro-visual {
        padding-left: 0;
    }
    
    .intro-stats {
        justify-content: center;
        gap: 1rem;
    }
    
    .stat-item .stat-number {
        font-size: 2rem;
    }
    
    .data-flow {
        flex-direction: column;
    }
    
    .flow-arrow {
        transform: rotate(90deg);
    }
    
    .demo-header {
        flex-direction: column;
        text-align: center;
        gap: 0.5rem;
    }
    
    .demo-title {
        font-size: 1.2rem;
    }
    
    .visual-container {
        padding: 2rem 1rem;
    }
}