/* ===== 返回顶部按钮 ===== */
    .scroll-top {
        position: fixed;
        right: 24px;
        bottom: 96px;
        width: 48px;
        height: 48px;
        border: none;
        border-radius: 50%;
        background: linear-gradient(135deg, #2563eb, #1d4ed8);
        color: #fff;
        box-shadow: 0 4px 16px rgba(37, 99, 235, 0.35);
        cursor: pointer;
        z-index: 9997;
        display: flex;
        align-items: center;
        justify-content: center;
        transition: all 0.3s ease;
        opacity: 0;
        visibility: hidden;
        transform: translateY(20px);
    }
    .scroll-top.visible {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
    }
    .scroll-top:hover {
        transform: translateY(-3px);
        box-shadow: 0 8px 24px rgba(37, 99, 235, 0.45);
    }
    .scroll-top svg {
        width: 20px;
        height: 20px;
    }

    /* ===== 页脚主样式 ===== */
    .site-footer {
        background: #0b1220;
        color: rgba(255, 255, 255, 0.7);
        font-size: 14px;
        position: relative;
    }
    .footer-main {
        padding: 72px 0 48px;
    }
    .footer-grid {
        display: grid;
        grid-template-columns: 1.6fr 1fr 1fr 1fr 1fr;
        gap: 40px;
    }
    .footer-brand .footer-logo {
        display: inline-block;
        margin-bottom: 20px;
    }
    .footer-brand .footer-logo img {
        height: 40px;
        width: auto;
        filter: brightness(0) invert(1);
    }
    .footer-brand p {
        line-height: 1.8;
        margin-bottom: 20px;
        max-width: 300px;
    }
    .footer-contact-list {
        list-style: none;
        padding: 0;
        margin: 0 0 24px;
    }
    .footer-contact-list li {
        display: flex;
        align-items: flex-start;
        gap: 10px;
        margin-bottom: 10px;
        line-height: 1.6;
    }
    .footer-contact-list svg {
        width: 18px;
        height: 18px;
        color: #22d3ee;
        flex-shrink: 0;
        margin-top: 2px;
    }
    .footer-contact-list a {
        color: rgba(255, 255, 255, 0.7);
        text-decoration: none;
        transition: color 0.3s;
    }
    .footer-contact-list a:hover {
        color: #22d3ee;
        text-decoration: none;
    }
    .footer-social {
        display: flex;
        gap: 10px;
    }
    .footer-social a {
        width: 36px;
        height: 36px;
        border-radius: 8px;
        background: rgba(255, 255, 255, 0.08);
        display: flex;
        align-items: center;
        justify-content: center;
        color: rgba(255, 255, 255, 0.8);
        transition: all 0.3s;
    }
    .footer-social a:hover {
        background: #2563eb;
        color: #fff;
        transform: translateY(-2px);
    }
    .footer-social svg {
        width: 18px;
        height: 18px;
    }
    .footer-column h4 {
        color: #fff;
        font-size: 15px;
        font-weight: 700;
        margin-bottom: 20px;
        position: relative;
        padding-bottom: 10px;
    }
    .footer-column h4::after {
        content: '';
        position: absolute;
        left: 0;
        bottom: 0;
        width: 24px;
        height: 3px;
        background: linear-gradient(90deg, #2563eb, #22d3ee);
        border-radius: 2px;
    }
    .footer-column ul {
        list-style: none;
        padding: 0;
        margin: 0;
    }
    .footer-column ul li {
        margin-bottom: 10px;
    }
    .footer-column ul li a {
        color: rgba(255, 255, 255, 0.7);
        text-decoration: none;
        transition: all 0.3s;
        display: inline-flex;
        align-items: center;
        gap: 6px;
    }
    .footer-column ul li a:hover {
        color: #22d3ee;
        transform: translateX(4px);
    }
    .footer-column ul li a svg {
        width: 14px;
        height: 14px;
        opacity: 0;
        transition: opacity 0.3s;
    }
    .footer-column ul li a:hover svg {
        opacity: 1;
    }

    /* ===== 信任背书条 ===== */
    .footer-trust {
        border-top: 1px solid rgba(255, 255, 255, 0.08);
        border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        padding: 32px 0;
    }
    .trust-inner {
        display: flex;
        align-items: center;
        justify-content: center;
        flex-wrap: wrap;
        gap: 32px;
    }
    .trust-badge {
        display: flex;
        align-items: center;
        gap: 12px;
        padding: 10px 18px;
        background: rgba(255, 255, 255, 0.04);
        border: 1px solid rgba(255, 255, 255, 0.08);
        border-radius: 10px;
    }
    .trust-badge img {
        width: 40px;
        height: 40px;
        object-fit: contain;
    }
    .trust-badge span {
        font-size: 13px;
        color: rgba(255, 255, 255, 0.85);
    }

    /* ===== 版权栏 ===== */
    .footer-bottom {
        background: rgba(0, 0, 0, 0.25);
        padding: 22px 0;
    }
    .footer-bottom-inner {
        display: flex;
        align-items: center;
        justify-content: space-between;
        flex-wrap: wrap;
        gap: 16px;
    }
    .footer-bottom p {
        margin: 0;
        color: rgba(255, 255, 255, 0.55);
        font-size: 13px;
    }
    .footer-bottom a {
        color: rgba(255, 255, 255, 0.7);
        text-decoration: none;
        transition: color 0.3s;
    }
    .footer-bottom a:hover {
        color: #22d3ee;
    }
    .footer-bottom-links {
        display: flex;
        gap: 20px;
        flex-wrap: wrap;
    }

    @media (max-width: 1199px) {
        .footer-grid {
            grid-template-columns: repeat(3, 1fr);
        }
        .footer-brand {
            grid-column: 1 / -1;
        }
    }
    @media (max-width: 767px) {
        .footer-main {
            padding: 48px 0 32px;
        }
        .footer-grid {
            grid-template-columns: repeat(2, 1fr);
            gap: 28px;
        }
        .footer-brand {
            grid-column: 1 / -1;
        }
        .footer-bottom-inner {
            flex-direction: column;
            text-align: center;
        }
        .scroll-top {
            right: 16px;
            bottom: 88px;
        }
    }
    @media (max-width: 480px) {
        .footer-grid {
            grid-template-columns: 1fr;
        }
    }