:root {
        --lp-navy: #050a30;    /* 午夜蓝 - 权威 */
        --lp-gold: #c5a021;    /* 香槟金 - 高端 */
        --lp-text: #1a1a1a;    /* 纯黑 - 专业阅读 */
        --lp-muted: #666666;   /* 灰色 - 辅助信息 */
        --lp-bg: #f9fafb;      /* 极浅灰 - 背景色 */
        --lp-border: #e5e7eb;  /* 细线条 */
    }

    .lp-buying-guide {
        font-family: 'Helvetica Neue', Arial, sans-serif;
        line-height: 1.8;
        color: var(--lp-text);
        max-width: 1920px;
        margin: 0 auto;
        padding: 60px 20px;
        background-color: #ffffff;
        text-align: left; /* 严格左对齐 */
    }

    /* --- Header Area --- */
    .lp-header-flex {
        display: flex;
        justify-content: space-between;
        align-items: flex-start;
        gap: 30px;
        margin-bottom: 50px;
        border-bottom: 2px solid var(--lp-navy);
        padding-bottom: 40px;
    }

    h1 {
        flex: 2;
        font-family: 'Georgia', serif;
        font-size: 2.6rem;
        color: var(--lp-navy);
        margin: 0;
        line-height: 1.1;
        font-weight: 400;
    }

    .lp-audience-box {
        flex: 1;
        background: var(--lp-bg);
        border: 1px solid var(--lp-gold);
        padding: 20px;
        border-radius: 2px;
        font-size: 0.85rem;
    }

    .lp-audience-box b {
        display: block;
        color: var(--lp-gold);
        text-transform: uppercase;
        letter-spacing: 1.5px;
        margin-bottom: 10px;
    }

    .lp-audience-box ul { margin: 0; padding: 0; list-style: none; }
    .lp-audience-box li { margin-bottom: 5px; padding-left: 15px; position: relative; }
    .lp-audience-box li::before { content: "•"; position: absolute; left: 0; color: var(--lp-gold); }

    /* --- Section Typography --- */
    h2 {
        font-family: 'Georgia', serif;
        font-size: 1.9rem;
        color: var(--lp-navy);
        margin-top: 80px;
        margin-bottom: 30px;
        border-bottom: 1px solid var(--lp-border);
        padding-bottom: 10px;
    }

    h3 {
        font-family: 'Georgia', serif;
        font-size: 1.5rem;
        color: var(--lp-gold);
        margin-top: 45px;
        margin-bottom: 20px;
    }

    p, li { font-size: 1.05rem; margin-bottom: 25px; }

    /* --- Medical Data Tables --- */
    .lp-table-wrap { overflow-x: auto; margin: 40px 0; }
    table { width: 100%; border-collapse: collapse; font-size: 0.95rem; }
    th { background: var(--lp-navy); color: #fff; padding: 15px; text-align: left; }
    td { padding: 15px; border-bottom: 1px solid var(--lp-border); vertical-align: top; }
    tr:nth-child(even) { background-color: var(--lp-bg); }

    /* --- Image Blocks --- */
    .lp-img-wrap { margin: 50px 0; text-align: left; }
    .lp-img-wrap img { max-width: 100%; height: auto; box-shadow: 0 5px 25px rgba(0,0,0,0.05); }
    .lp-caption { display: block; font-size: 0.85rem; color: var(--lp-muted); margin-top: 15px; font-style: italic; }

    /* --- Specialized Content Blocks --- */
    .lp-clinical-box {
        background: #fdfdfd;
        border: 1px solid var(--lp-border);
        padding: 35px;
        margin: 40px 0;
        border-left: 4px solid var(--lp-gold);
    }

    .lp-highlight-list li { margin-bottom: 15px; }

    /* --- FAQ Section --- */
    .lp-faq-container {
        margin-top: 100px;
        background: var(--lp-bg);
        padding: 60px 40px;
        border-radius: 4px;
    }

    .lp-faq-item { margin-bottom: 45px; }
    .lp-faq-q { font-family: 'Georgia', serif; font-size: 1.25rem; color: var(--lp-navy); display: block; margin-bottom: 12px; }
    .lp-faq-a { font-size: 1rem; color: var(--lp-text); }

    /* --- Author & CTA --- */
    .lp-author-footer {
        margin-top: 100px;
        padding-top: 60px;
        border-top: 2px solid var(--lp-navy);
        display: flex;
        gap: 30px;
        align-items: center;
    }

    .lp-avatar { width: 80px; height: 80px; border-radius: 50%; background: var(--lp-gold); color: white; display: flex; align-items: center; justify-content: center; font-weight: bold; font-size: 1.5rem; }
    .lp-author-info p { margin: 4px 0; font-size: 0.9rem; color: var(--lp-muted); }
    .lp-author-info b { color: var(--lp-navy); font-size: 1.1rem; display: block; margin-bottom: 5px; }

    .lp-cta-container { text-align: left; margin-top: 80px; }
    .lp-btn-primary {
        background-color: var(--lp-navy);
        color: #ffffff;
        padding: 20px 60px;
        text-decoration: none;
        font-size: 1.1rem;
        font-weight: bold;
        display: inline-block;
        transition: 0.3s;
        text-transform: uppercase;
        letter-spacing: 2px;
    }
    .lp-btn-primary:hover { background-color: var(--lp-gold); transform: translateY(-2px); }

    @media (max-width: 850px) {
        .lp-header-flex { flex-direction: column; }
        h1 { font-size: 2.1rem; }
        .lp-author-footer { flex-direction: column; }
    }