.hub-guide {
        max-width: 800px;
        margin: 40px auto;
        font-family: 'Segoe UI', sans-serif;
        line-height: 1.6;
        color: #333;
    }
    .hub-section {
        margin-bottom: 2.5rem;
        padding: 1.5rem;
        background: #f8f9fa;
        border-radius: 8px;
        box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    }
    .hub-title {
        color: #2c3e50;
        margin-bottom: 1.2rem;
        font-size: 1.8em;
        border-bottom: 2px solid #3498db;
        padding-bottom: 0.5rem;
    }
    .hub-subtitle {
        color: #3498db;
        margin: 1.2rem 0 0.8rem;
        font-size: 1.2em;
    }
    .hub-list {
        padding-left: 1.8rem;
        margin: 0.8rem 0;
    }
    .hub-list li {
        margin-bottom: 0.6rem;
    }
    .pro-tip {
        background: #e3f2fd;
        padding: 1rem;
        border-left: 4px solid #3498db;
        margin: 1.2rem 0;
        border-radius: 4px;
    }
    .checklist {
        columns: 2;
        list-style-type: none;
        padding-left: 0;
    }
    .key-term {
        color: #e74c3c;
        font-weight: 600;
    }