/* 加入我们页面样式 */
.join-page {
    padding: 80px 0;
}

.intro-text {
    max-width: 100%;
    margin: 0 0 60px;
    padding: 40px;
    background: white;
    border-radius: 16px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.06);
}

.intro-paragraph {
    font-size: 1.1em;
    line-height: 1.8;
    color: #2c3e50;
    margin-bottom: 30px;
}

.research-directions {
    margin: 30px 0;
}

.research-directions h3 {
    font-size: 1.2em;
    color: #2c3e50;
    margin-bottom: 20px;
    font-weight: 600;
}

.research-directions ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.research-directions li {
    position: relative;
    padding-left: 24px;
    margin-bottom: 15px;
    font-size: 1.05em;
    color: #4a5568;
    line-height: 1.6;
}

.research-directions li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: #3b82f6;
    font-weight: bold;
}

.welcome-text {
    font-size: 1.1em;
    line-height: 1.8;
    color: #2c3e50;
    margin-top: 30px;
    padding-top: 30px;
    border-top: 1px solid #e2e8f0;
    font-weight: 500;
}

/* 机会卡片样式 */
.opportunities {
    margin-bottom: 4rem;
}

.opportunities h2 {
    font-size: 2em;
    font-weight: 500;
    margin-bottom: 2rem;
    color: #333;
}

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

.opportunity-card {
    background: #f8f9fa;
    padding: 2rem;
    border-radius: 8px;
    transition: transform 0.3s ease;
}

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

.card-content h3 {
    font-size: 1.5em;
    margin-bottom: 1.5rem;
    color: #333;
}

.card-content ul {
    list-style: none;
    padding: 0;
    margin-bottom: 1.5rem;
}

.card-content li {
    margin-bottom: 1rem;
    color: #666;
    position: relative;
    padding-left: 1.5rem;
}

.card-content li::before {
    content: "•";
    position: absolute;
    left: 0;
    color: #0066cc;
}

.quota {
    font-weight: 500;
    color: #0066cc;
    margin-top: 1rem;
}

/* 申请信息样式 */
.application-info {
    margin-top: 4rem;
}

.application-info h2 {
    font-size: 2em;
    font-weight: 500;
    margin-bottom: 2rem;
    color: #333;
}

.application-content {
    background: #f8f9fa;
    padding: 2rem;
    border-radius: 8px;
}

.application-content ul {
    list-style: none;
    padding: 0;
    margin-bottom: 2rem;
}

.application-content li {
    margin-bottom: 1rem;
    color: #666;
    position: relative;
    padding-left: 1.5rem;
}

.application-content li::before {
    content: "•";
    position: absolute;
    left: 0;
    color: #0066cc;
}

.contact-info {
    border-top: 1px solid #ddd;
    padding-top: 2rem;
    margin-top: 2rem;
}

.contact-info p {
    margin-bottom: 1rem;
    color: #666;
}

.contact-info strong {
    color: #0066cc;
}

.example {
    font-style: italic;
    color: #999;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .intro-text {
        padding: 25px;
        margin-bottom: 40px;
    }

    .intro-paragraph,
    .welcome-text {
        font-size: 1em;
    }

    .research-directions li {
        font-size: 1em;
        margin-bottom: 12px;
    }

    .opportunity-grid {
        grid-template-columns: 1fr;
    }

    .application-content {
        padding: 1.5rem;
    }
}