body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    background-color: #f4f4f4;
}

/* 科技感背景区域 */
.tech-background {
    background-image: url('https://jpk.sgcode.cn/beijingtu01.png');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    padding-bottom: 40px;
    position: relative;
}

/* 导航栏样式 */
.main-nav {
    background-color: rgba(16, 31, 54, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(43, 103, 255, 0.3);
}

.nav-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
    position: relative;
}

.logo {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    gap: 10px;
    color: white;
}

.logo img {
    height: 60px;
    width: auto;
    max-height: calc(100% - 10px);
}

.logo span {
    font-size: 18px;
    font-weight: 500;
}

.nav-links {
    display: flex;
    gap: 30px;
}

.nav-links a {
    color: white;
    text-decoration: none;
    font-size: 14px;
    transition: all 0.3s ease;
    padding: 5px 0;
    position: relative;
}

.nav-links a:hover {
    color: #4a90e2;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: #4a90e2;
    transition: width 0.3s ease;
}

.nav-links a:hover::after {
    width: 100%;
}

.login-status {
    display: flex;
    align-items: center;
    gap: 10px;
    color: white;
}

.login-status .role {
    background-color: #3498db;
    padding: 5px 10px;
    border-radius: 4px;
    font-size: 14px;
}

.login-status .logout-btn {
    background-color: #e74c3c;
    color: white;
    padding: 5px 10px;
    border-radius: 4px;
    font-size: 14px;
    text-decoration: none;
    margin-left: 10px;
    transition: background-color 0.3s ease;
}

.login-status .logout-btn:hover {
    background-color: #c0392b;
}

/* 数据统计模块样式 */
.stats-section {
    max-width: 1200px;
    margin: 0 auto;
    padding: 40px 20px 0;
}

.stats-container {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    justify-items: center;
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    width: 100%;
    max-width: 200px;
    transition: transform 0.3s ease;
}

.stat-item:hover {
    transform: translateY(-5px);
}

/* 球形设计 */
.stat-sphere {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    background: linear-gradient(135deg, rgba(74, 144, 226, 0.9), rgba(44, 62, 80, 0.9));
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
    position: relative;
    overflow: hidden;
    border: 3px solid rgba(43, 103, 255, 0.3);
}

.stat-sphere::after {
    content: '';
    position: absolute;
    top: -10px;
    right: -10px;
    bottom: -10px;
    left: -10px;
    border-radius: 50%;
    border: 2px solid rgba(255, 255, 255, 0.1);
    pointer-events: none;
}

/* 数字样式 */
.stat-number {
    font-size: 24px;
    font-weight: bold;
    color: white;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
    z-index: 1;
}

/* 分割线 */
.stat-divider {
    width: 40px;
    height: 2px;
    background: linear-gradient(to right, transparent, rgba(255, 255, 255, 0.5), transparent);
    margin: 15px 0;
}

/* 标签样式 */
.stat-label {
    font-size: 14px;
    color: white;
    opacity: 0.9;
    padding: 0 10px;
}

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

.logo i {
    font-size: 24px;
    color: #3498db;
}

.logo h1 {
    font-weight: 400;
    font-size: 20px;
    margin: 0;
}

.container {
    flex: 1;
    background-color: white;
    padding: 40px 20px;
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    text-align: center;
    margin: -20px auto 40px;
    max-width: 1000px;
    position: relative;
    z-index: 10;
    border: 1px solid rgba(0, 0, 0, 0.05);
}

.role-description {
    color: #666;
    margin: 10px 0 20px;
    line-height: 1.5;
}

.role-options {
    display: flex;
    justify-content: space-between;
    gap: 20px;
}

.role-box {
    flex: 1;
    padding: 20px;
    border-radius: 8px;
    background-color: white;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    text-align: center;
    transition: all 0.3s ease;
}

.role-box:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
}

.icon {
    font-size: 40px;
    color: #007bff;
    margin-bottom: 10px;
}

.role科技成果方, .role技术经理人, .role商业需求方 {
    padding: 10px 20px;
    border-radius: 5px;
    text-decoration: none;
    color: white;
    font-weight: bold;
    display: inline-block;
    margin-top: 10px;
    transition: all 0.3s ease;
}

.role科技成果方:hover, .role技术经理人:hover, .role商业需求方:hover {
    transform: scale(1.05);
}

.role科技成果方 {
    background-color: #add8e6;
}

.role技术经理人 {
    background-color: #90ee90;
}

.role商业需求方 {
    background-color: #ffb6c1;
}

/* 高校技术成果展示模块样式 */
.university-projects {
    background-color: #f8f9fa;
    padding: 60px 0;
}

.section-title {
    text-align: center;
    font-size: 28px;
    color: #1a202c;
    margin-bottom: 40px;
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: linear-gradient(to right, #4a90e2, #2c3e50);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    margin-top: 30px;
}

.project-item {
    background-color: white;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.project-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.project-image {
    width: 100%;
    height: 200px;
    overflow: hidden;
}

.project-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.project-video {
    width: 100%;
    height: 200px;
    overflow: hidden;
    border-radius: 10px 10px 0 0;
    background-color: #1a202c;
}

.project-video video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 10px 10px 0 0;
    transition: transform 0.3s ease;
}

.project-item:hover .project-video video {
    transform: scale(1.05);
}

/* 锁定状态样式 */
.project-item.locked {
    position: relative;
    cursor: not-allowed;
}

.project-item.locked .project-video,
.project-item.locked .project-info {
    filter: blur(3px);
    opacity: 0.7;
}

.project-item.locked::after {
    content: '🔒';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 48px;
    color: white;
    background-color: rgba(0, 0, 0, 0.6);
    width: 80px;
    height: 80px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
}

.project-item.locked video {
    pointer-events: none;
}

.project-info {
    padding: 20px;
}

.project-info h3 {
    margin: 0 0 10px 0;
    font-size: 18px;
    color: #1a202c;
}

.project-info p {
    margin: 0 0 15px 0;
    color: #718096;
    font-size: 14px;
    line-height: 1.5;
}

.project-meta {
    display: flex;
    justify-content: space-between;
    font-size: 12px;
    color: #a0aec0;
}

/* 响应式设计 */
@media (max-width: 992px) {
    .projects-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .project-video {
        height: 180px;
    }
}

footer {
    background-color: #f8f9fa;
    text-align: center;
    padding: 20px;
    margin-top: auto;
}

.role科技成果方 {
    background-color: #add8e6; /* 浅蓝色 */
}

.role技术经理人 {
    background-color: white;
    color: black;
    border: 1px solid #ccc;
}

.role商业需求方 {
    background-color: #ffb6c1; /* 浅红色 */
}

body.科技成果方 {
    background-color: #add8e6;
}

body.技术经理人 {
    background-color: white;
}

body.商业需求方 {
    background-color: #ffb6c1;
}

form {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

input, button {
    padding: 8px;
    border: 1px solid #ccc;
    border-radius: 4px;
}

button {
    background-color: #007bff;
    color: white;
    border: none;
    cursor: pointer;
}

button:hover {
    background-color: #0056b3;
}