/* ---------- 悬浮电话按钮：右侧垂直居中 ---------- */
        .call-float-btn {
            position: fixed;
            top: 50%;
            right: 24px;
            /* 通过负margin实现垂直居中（不依赖transform，避免与脉冲动画冲突） */
            margin-top: -36px;   /* 高度72px的一半 */
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: radial-gradient(circle at 30% 25%, #3b82f6, #1e3a8a);
            box-shadow: 0 15px 30px -5px rgba(37, 99, 235, 0.45), 0 0 0 0 rgba(59,130,246,0.3);
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            z-index: 9999;
            transition: all 0.2s cubic-bezier(0.2, 0.9, 0.4, 1.1);
            text-decoration: none;
            /* 脉冲缩放动画 (呼吸感) */
            animation: gentleFloat 2.2s infinite ease-in-out;
            /* 让波纹扩散可见，不裁剪 */
            overflow: visible !important;
        }

        /* 脉冲缩放关键帧 (只改变缩放和阴影，保留位置不变) */
        @keyframes gentleFloat {
            0% {
                transform: scale(1);
                box-shadow: 0 15px 30px -5px rgba(37, 99, 235, 0.5), 0 0 0 0 rgba(59,130,246,0.4);
            }
            50% {
                transform: scale(1.06);
                box-shadow: 0 22px 38px -8px rgba(37, 99, 235, 0.6), 0 0 0 6px rgba(59,130,246,0.2);
            }
            100% {
                transform: scale(1);
                box-shadow: 0 15px 30px -5px rgba(37, 99, 235, 0.5), 0 0 0 0 rgba(59,130,246,0);
            }
        }

        /* 电话SVG图标样式 */
        .call-float-btn svg {
            width: 16px;
            height: 16px;
            filter: drop-shadow(0 2px 4px rgba(0,0,0,0.1));
            transition: transform 0.2s ease;
            pointer-events: none;
        }

        /* 点击时的“压感”效果 */
        .call-float-btn:active {
            transform: scale(0.94) !important;
            transition: transform 0.08s linear;
            box-shadow: 0 8px 18px rgba(37, 99, 235, 0.5);
        }

        /* ---------- 双层波纹扩散动图 (精美光环) ---------- */
        .call-float-btn::before,
        .call-float-btn::after {
            content: '';
            position: absolute;
            top: 50%;
            left: 50%;
            width: 100%;
            height: 100%;
            border-radius: 50%;
            background: transparent;
            border: 2px solid rgba(59, 130, 246, 0.55);
            box-shadow: 0 0 8px rgba(59,130,246,0.3);
            transform: translate(-50%, -50%) scale(0.8);
            pointer-events: none;
            z-index: -1;
            opacity: 0.7;
            animation: rippleWave 2.4s cubic-bezier(0.2, 0.9, 0.4, 1.1) infinite;
        }

        /* 第二个波纹延迟，营造连续声波动效 */
        .call-float-btn::after {
            border-width: 2.2px;
            border-color: rgba(59, 130, 246, 0.4);
            animation: rippleWave 2.4s cubic-bezier(0.2, 1, 0.5, 1) infinite;
            animation-delay: 0.9s;
            opacity: 0.5;
        }

        /* 涟漪扩散关键帧 */
        @keyframes rippleWave {
            0% {
                transform: translate(-50%, -50%) scale(0.9);
                opacity: 0.8;
                border-width: 2.5px;
            }
            50% {
                opacity: 0.4;
            }
            100% {
                transform: translate(-50%, -50%) scale(1.8);
                opacity: 0;
                border-width: 1px;
            }
        }

        /* 悬停效果（桌面辅助交互，优雅微提升） */
        @media (hover: hover) {
            .call-float-btn:hover {
                transform: scale(1.04);
                box-shadow: 0 24px 40px -8px #1e4b8f;
                background: radial-gradient(circle at 30% 25%, #5694ff, #1e3a8a);
            }
            .call-float-btn:hover::before {
                animation-duration: 1.8s;
            }
            .call-float-btn:hover::after {
                animation-duration: 1.8s;
                animation-delay: 0.6s;
            }
        }

        /* 移动端触控优化，无怪异外框 */
        .call-float-btn:focus-visible {
            outline: 3px solid #ffffffcc;
            outline-offset: 3px;
        }

        /* 响应式：小屏幕稍微缩小按钮，同时调整垂直居中的负边距 */
        @media (max-width: 480px) {
            .call-float-btn {
                width: 40px;
                height: 40px;
                right: 20px;
                margin-top: -32px;   /* 高度64的一半 */
            }
            .call-float-btn svg {
                width: 16px;
                height: 16px;
            }
        }

        /* 确保任何情况下按钮波纹不被截断 */
        .call-float-btn {
            will-change: transform, box-shadow;
            backface-visibility: hidden;
        }