body {
    font-family: 'Microsoft YaHei', Arial, sans-serif;
    line-height: 1.8;
    color: #333;
    background-color: #f8fafc;
}
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    width: 100%;
    flex: 1;
}
.tab-container {
    background-color: white;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
    overflow: hidden;
    margin: 0 auto 50px;
}
.tab-buttons {
    display: flex;
    justify-content: center;
    background-color: #f7fafc;
    border-bottom: 1px solid #e2e8f0;
}
.tab-btn {
    padding: 18px 40px;
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1.1rem;
    font-weight: 600;
    color: #4a5568;
    transition: all 0.3s ease;
    position: relative;
}
.tab-btn:hover {
    color: #2b6cb0;
}
.tab-btn.active {
    color: #2b6cb0;
}
.tab-btn.active::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 100%;
    height: 3px;
    background-color: #2b6cb0;
}
.tab-content {
    padding: 40px;
    display: none;
    animation: fadeIn 0.5s ease;
}
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}
.tab-content.active {
    display: block;
}
h2 {
    color: #2b6cb0;
    font-size: 1.8rem;
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 1px solid #e2e8f0;
    text-align: center;
}
h3 {
    color: #3182ce;
    font-size: 1.3rem;
    margin: 30px 0 15px;
}
.tab-content p {
    margin: 15px 0;
    color: #4a5568;
    font-size: 1.05rem;
}
ul {
    padding-left: 25px;
    margin: 15px 0;
}
li {
    margin-bottom: 10px;
    color: #4a5568;
}
.highlight {
    background-color: #ebf8ff;
    padding: 25px;
    border-radius: 8px;
    margin: 30px 0;
    border-left: 4px solid #3182ce;
}
@media (max-width: 768px) {
    .header {
        padding: 30px 0 20px;
    }
    .header h1 {
        font-size: 2rem;
    }
    .tab-btn {
        padding: 15px 20px;
        font-size: 1rem;
    }
    .tab-content {
        padding: 25px;
    }
    h2 {
        font-size: 1.5rem;
    }
}