* {
        margin: 0;
        padding: 0;
        box-sizing: border-box;
    }

    body {
        font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
        line-height: 1.6;
        color: #333;
        background-color: #fff;
    }

    .xiqi-header {
        background: #fff;
        box-shadow: 0 2px 10px rgba(0,0,0,0.1);
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        z-index: 1000;
    }

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

    .xiqi-logo img {
        height: 40px;
        width: auto;
    }

    .xiqi-menu-toggle {
        display: none;
        flex-direction: column;
        background: none;
        border: none;
        cursor: pointer;
        padding: 5px;
    }

    .xiqi-menu-toggle span {
        width: 25px;
        height: 3px;
        background: #333;
        margin: 3px 0;
        transition: 0.3s;
    }

    .xiqi-nav-menu {
        display: flex;
        list-style: none;
        gap: 30px;
    }

    .xiqi-nav-menu a {
        text-decoration: none;
        color: #333;
        font-weight: 500;
        transition: color 0.3s;
    }

    .xiqi-nav-menu a:hover,
    .xiqi-nav-menu a.active {
        color: #4285f4;
    }

    .xiqi-nav-overlay {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(0,0,0,0.5);
        z-index: 999;
    }

    .xiqi-main {
        margin-top: 70px;
    }

    .xiqi-privacy-header {
        background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
        color: white;
        padding: 80px 0 60px;
        text-align: center;
    }

    .xiqi-privacy-header .xiqi-container {
        max-width: 1200px;
        margin: 0 auto;
        padding: 0 20px;
    }

    .xiqi-privacy-title {
        font-size: 3.5rem;
        font-weight: 700;
        margin-bottom: 20px;
        text-shadow: 0 2px 4px rgba(0,0,0,0.3);
    }

    .xiqi-privacy-subtitle {
        font-size: 1.3rem;
        opacity: 0.9;
        max-width: 600px;
        margin: 0 auto;
        line-height: 1.6;
    }

    .xiqi-privacy-nav {
        background: #f8f9fa;
        padding: 30px 0;
        border-bottom: 1px solid #e9ecef;
    }

    .xiqi-privacy-nav .xiqi-container {
        max-width: 1200px;
        margin: 0 auto;
        padding: 0 20px;
    }

    .xiqi-privacy-tabs {
        display: flex;
        gap: 20px;
        flex-wrap: wrap;
        justify-content: center;
    }

    .xiqi-privacy-tab {
        background: white;
        border: 2px solid #e9ecef;
        border-radius: 25px;
        padding: 12px 24px;
        text-decoration: none;
        color: #666;
        font-weight: 500;
        transition: all 0.3s;
        cursor: pointer;
    }

    .xiqi-privacy-tab:hover,
    .xiqi-privacy-tab.active {
        background: #4285f4;
        color: white;
        border-color: #4285f4;
        transform: translateY(-2px);
    }

    .xiqi-privacy-content {
        padding: 80px 0;
    }

    .xiqi-container {
        max-width: 1200px;
        margin: 0 auto;
        padding: 0 20px;
    }

    .xiqi-privacy-section {
        margin-bottom: 80px;
    }

    .xiqi-section-title {
        font-size: 2.5rem;
        font-weight: 700;
        color: #333;
        margin-bottom: 20px;
        text-align: center;
    }

    .xiqi-section-subtitle {
        font-size: 1.2rem;
        color: #666;
        text-align: center;
        margin-bottom: 50px;
        max-width: 800px;
        margin-left: auto;
        margin-right: auto;
    }

    .xiqi-features-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
        gap: 40px;
        margin-top: 50px;
    }

    .xiqi-feature-card {
        background: white;
        border-radius: 20px;
        padding: 40px;
        box-shadow: 0 10px 30px rgba(0,0,0,0.1);
        transition: transform 0.3s, box-shadow 0.3s;
        border: 1px solid #f0f0f0;
    }

    .xiqi-feature-card:hover {
        transform: translateY(-10px);
        box-shadow: 0 20px 40px rgba(0,0,0,0.15);
    }

    .xiqi-feature-icon {
        font-size: 3rem;
        margin-bottom: 20px;
        display: block;
    }

    .xiqi-feature-title {
        font-size: 1.5rem;
        font-weight: 700;
        color: #333;
        margin-bottom: 15px;
    }

    .xiqi-feature-desc {
        color: #666;
        line-height: 1.7;
    }

    .xiqi-security-showcase {
        background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
        border-radius: 30px;
        padding: 60px;
        color: white;
        text-align: center;
        margin: 60px 0;
    }

    .xiqi-showcase-title {
        font-size: 2.5rem;
        font-weight: 700;
        margin-bottom: 20px;
    }

    .xiqi-showcase-desc {
        font-size: 1.2rem;
        opacity: 0.9;
        margin-bottom: 40px;
        max-width: 600px;
        margin-left: auto;
        margin-right: auto;
    }

    .xiqi-showcase-image {
        max-width: 100%;
        border-radius: 15px;
        box-shadow: 0 20px 40px rgba(0,0,0,0.3);
    }

    .xiqi-privacy-tools {
        background: #f8f9fa;
        border-radius: 30px;
        padding: 60px;
        margin: 60px 0;
    }

    .xiqi-tools-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
        gap: 30px;
        margin-top: 40px;
    }

    .xiqi-tool-item {
        background: white;
        border-radius: 15px;
        padding: 30px;
        text-align: center;
        box-shadow: 0 5px 15px rgba(0,0,0,0.08);
        transition: transform 0.3s;
    }

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

    .xiqi-tool-icon {
        font-size: 2.5rem;
        margin-bottom: 15px;
        display: block;
    }

    .xiqi-tool-name {
        font-size: 1.3rem;
        font-weight: 600;
        color: #333;
        margin-bottom: 10px;
    }

    .xiqi-tool-desc {
        color: #666;
        font-size: 0.95rem;
    }

    .xiqi-comparison-table {
        background: white;
        border-radius: 20px;
        overflow: hidden;
        box-shadow: 0 10px 30px rgba(0,0,0,0.1);
        margin: 50px 0;
    }

    .xiqi-table-header {
        background: linear-gradient(135deg, #4285f4 0%, #34a853 100%);
        color: white;
        padding: 30px;
        text-align: center;
    }

    .xiqi-table-title {
        font-size: 2rem;
        font-weight: 700;
        margin-bottom: 10px;
    }

    .xiqi-table-subtitle {
        opacity: 0.9;
    }

    .xiqi-table-content {
        padding: 40px;
    }

    .xiqi-comparison-row {
        display: grid;
        grid-template-columns: 1fr 1fr 1fr;
        gap: 30px;
        padding: 20px 0;
        border-bottom: 1px solid #f0f0f0;
        align-items: center;
    }

    .xiqi-comparison-row:last-child {
        border-bottom: none;
    }

    .xiqi-comparison-feature {
        font-weight: 600;
        color: #333;
    }

    .xiqi-comparison-chrome {
        color: #34a853;
        font-weight: 600;
        text-align: center;
    }

    .xiqi-comparison-others {
        color: #ea4335;
        text-align: center;
    }

    .xiqi-cta-section {
        background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
        border-radius: 30px;
        padding: 80px 40px;
        text-align: center;
        color: white;
        margin: 80px 0;
    }

    .xiqi-cta-title {
        font-size: 2.5rem;
        font-weight: 700;
        margin-bottom: 20px;
    }

    .xiqi-cta-desc {
        font-size: 1.2rem;
        opacity: 0.9;
        margin-bottom: 40px;
        max-width: 600px;
        margin-left: auto;
        margin-right: auto;
    }

    .xiqi-cta-button {
        display: inline-block;
        background: white;
        color: #667eea;
        padding: 18px 40px;
        border-radius: 50px;
        text-decoration: none;
        font-weight: 700;
        font-size: 1.1rem;
        transition: all 0.3s;
        box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    }

    .xiqi-cta-button:hover {
        transform: translateY(-3px);
        box-shadow: 0 15px 40px rgba(0,0,0,0.3);
    }

    .xiqi-footer {
        background: #1a1a1a;
        color: #ccc;
        padding: 60px 0 30px;
    }

    .xiqi-footer-content {
        max-width: 1200px;
        margin: 0 auto;
        padding: 0 20px;
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        gap: 40px;
    }

    .xiqi-footer-section h3 {
        color: white;
        font-size: 1.3rem;
        margin-bottom: 20px;
        font-weight: 600;
    }

    .xiqi-footer-section ul {
        list-style: none;
    }

    .xiqi-footer-section ul li {
        margin-bottom: 10px;
    }

    .xiqi-footer-section ul li a {
        color: #ccc;
        text-decoration: none;
        transition: color 0.3s;
    }

    .xiqi-footer-section ul li a:hover {
        color: #4285f4;
    }

    .xiqi-footer-bottom {
        border-top: 1px solid #333;
        margin-top: 40px;
        padding-top: 30px;
        text-align: center;
        color: #999;
    }

    @media (max-width: 768px) {
        .xiqi-menu-toggle {
            display: flex;
        }

        .xiqi-nav-menu {
            display: none;
            position: fixed;
            top: 70px;
            left: 0;
            right: 0;
            background: white;
            flex-direction: column;
            padding: 20px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
            z-index: 1001;
        }

        .xiqi-nav-menu.active {
            display: flex;
        }

        .xiqi-nav-overlay.active {
            display: block;
        }

        .xiqi-privacy-title {
            font-size: 2.5rem;
        }

        .xiqi-privacy-subtitle {
            font-size: 1.1rem;
        }

        .xiqi-section-title {
            font-size: 2rem;
        }

        .xiqi-features-grid {
            grid-template-columns: 1fr;
            gap: 30px;
        }

        .xiqi-feature-card {
            padding: 30px;
        }

        .xiqi-security-showcase {
            padding: 40px 30px;
        }

        .xiqi-showcase-title {
            font-size: 2rem;
        }

        .xiqi-privacy-tools {
            padding: 40px 30px;
        }

        .xiqi-tools-grid {
            grid-template-columns: 1fr;
        }

        .xiqi-comparison-row {
            grid-template-columns: 1fr;
            gap: 15px;
            text-align: center;
        }

        .xiqi-cta-section {
            padding: 60px 30px;
        }

        .xiqi-cta-title {
            font-size: 2rem;
        }

        .xiqi-privacy-tabs {
            flex-direction: column;
            align-items: center;
        }

        .xiqi-privacy-tab {
            width: 100%;
            max-width: 300px;
            text-align: center;
        }
    }

    @media (max-width: 480px) {
        .xiqi-privacy-title {
            font-size: 2rem;
        }

        .xiqi-section-title {
            font-size: 1.8rem;
        }

        .xiqi-feature-card {
            padding: 25px;
        }

        .xiqi-security-showcase {
            padding: 30px 20px;
        }

        .xiqi-privacy-tools {
            padding: 30px 20px;
        }

        .xiqi-cta-section {
            padding: 50px 20px;
        }
    }