/* --- 右下角相机控制面板 --- */
        #camera-controls {
            position: absolute;
            bottom: 30px;
            right: 30px;
            z-index: 100;
            background: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(8px);
            -webkit-backdrop-filter: blur(8px);
            border-radius: 30px;
            padding: 6px 8px;
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 2px;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
            border: 1px solid rgba(255, 255, 255, 0.3);
            user-select: none;
        }
        #camera-controls .ctrl-btn {
            background: transparent;
            border: none;
            color: #444;
            width: 36px;
            height: 36px;
            border-radius: var(--control-radius);
            font-size: 16px;
            cursor: pointer;
            transition: all 0.2s ease;
            display: flex;
            align-items: center;
            justify-content: center;
            font-family: inherit;
            font-weight: 500;
        }

        #zoomInBtn,
        #zoomOutBtn,
        #resetTiltBtn,
        #compassContainer,
        #cesiumContainer {
            touch-action: manipulation;
        }

        #camera-controls .ctrl-btn:hover {
            background: rgba(0, 0, 0, 0.08);
            color: #000;
        }
        #camera-controls .ctrl-btn:active {
            transform: scale(0.92);
        }
        #camera-controls .divider {
            width: 24px;
            height: 1px;
            background: #e0e0e0;
            margin: 2px 0;
        }
        /* 响应式适配：手机端缩小一点 */
        @media (max-width: 700px) {
            #camera-controls {
                bottom: 20px;
                right: 16px;
                padding: 4px 6px;
            }
            #camera-controls .ctrl-btn {
                width: 30px;
                height: 30px;
                font-size: 14px;
            }
        }