html,
        body {
            margin: 0;
            padding: 0;
        }

        body {
            font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'PingFang SC', 'Microsoft YaHei', sans-serif;
            color: #0f172a;
        }
        
        .card-hover { transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1); }
        .card-hover:hover { transform: translateY(-4px); box-shadow: 0 10px 25px -5px rgba(0,0,0,0.1), 0 8px 10px -6px rgba(0,0,0,0.1); }
        .contact-rail {
            position: fixed;
            z-index: 60;
            top: 50%;
            right: 24px;
            width: 86px;
            overflow: visible;
            transform: translateY(-50%);
            border-radius: 15px;
            padding-top: 8px;
            background: #fff;
            box-shadow: 0 16px 32px rgba(43, 64, 88, .16);
        }
        .contact-rail__item {
            position: relative;
            display: flex;
            min-height: 64px;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 4px;
            color: #475569;
            font-size: 10px;
            font-weight: 600;
            text-decoration: none;
        }
        .contact-rail__item + .contact-rail__item { border-top: 1px solid #edf0f4; }
        .contact-rail__item svg { width: 23px; height: 23px; color: var(--brand); stroke-width: 1.8; }
        .contact-rail__item--phone:hover { background: #f4f9ff; color: #1263f3; }
        .contact-rail__qr {
            position: absolute;
            top: 50%;
            right: calc(100% + 12px);
            display: flex;
            width: 174px;
            transform: translateY(-50%) translateX(8px);
            visibility: hidden;
            opacity: 0;
            flex-direction: column;
            align-items: center;
            gap: 8px;
            border: 1px solid #e6ebf1;
            border-radius: 12px;
            padding: 12px;
            background: #fff;
            box-shadow: 0 12px 32px rgba(22, 37, 61, .18);
            color: #384152;
            font-size: 13px;
            transition: .18s ease;
            pointer-events: none;
        }
        .contact-rail__qr img { display: block; width: 150px; height: 150px; object-fit: contain; }
        .contact-rail__item:hover .contact-rail__qr { transform: translateY(-50%); visibility: visible; opacity: 1; }
        .contact-rail__phone { display: block; max-height: 0; overflow: hidden; padding: 0 2px; border-top: 0 solid #edf0f4; color: #2878d8; font-size: 12px; font-weight: 800; letter-spacing: -.35px; line-height: 1; text-align: center; text-decoration: none; white-space: nowrap; opacity: 0; transition: max-height .18s ease, padding .18s ease, opacity .15s ease; }
        .contact-rail:hover .contact-rail__phone { max-height: 28px; padding: 7px 2px 9px; border-top-width: 1px; opacity: 1; }
        @media (max-width: 768px) {
            .contact-rail { right: 10px; transform: translateY(-50%) scale(.82); transform-origin: right center; }
        }