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

        body {
            font-family: 'Microsoft YaHei', Arial, sans-serif;
            background: linear-gradient(135deg, #1e3c72 0%, #2a5298 50%, #7e8ba3 100%);
            overflow: hidden;
            height: 100vh;
        }

        .container {
            display: flex;
            height: 100vh;
            padding: 10px;
            gap: 10px;
        }

        /* 左侧面板 */
        .sidebar {
            width: 300px;
            background: rgba(255, 255, 255, 0.95);
            border-radius: 15px;
            padding: 15px;
            overflow-y: auto;
            box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
            backdrop-filter: blur(10px);
        }

        .sidebar h2 {
            color: #1e3c72;
            margin-bottom: 15px;
            font-size: 20px;
            border-bottom: 3px solid #1e3c72;
            padding-bottom: 8px;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.1);
        }

        .category {
            margin-bottom: 20px;
        }

        .category h3 {
            color: #555;
            font-size: 14px;
            margin-bottom: 10px;
            display: flex;
            align-items: center;
            gap: 5px;
            background: linear-gradient(90deg, #f0f0f0, transparent);
            padding: 5px 10px;
            border-radius: 5px;
        }

        .items-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 8px;
        }

        .item {
            background: linear-gradient(145deg, #ffffff, #f0f0f0);
            border: 2px solid #e0e0e0;
            border-radius: 10px;
            padding: 12px 8px;
            text-align: center;
            cursor: grab;
            transition: all 0.3s;
            user-select: none;
            box-shadow: 0 2px 5px rgba(0,0,0,0.1);
            position: relative;
        }

        .item:hover {
            transform: translateY(-3px) scale(1.05);
            box-shadow: 0 6px 20px rgba(30, 60, 114, 0.4);
            border-color: #1e3c72;
            background: linear-gradient(145deg, #ffffff, #e8f0ff);
        }

        .item:active {
            cursor: grabbing;
            transform: translateY(-1px) scale(1.02);
        }

        /* 广口瓶图标样式 */
        .wide-bottle-icon {
            width: 50px;
            height: 60px;
            margin: 0 auto 5px;
            position: relative;
        }

        .bottle-icon-body {
            width: 100%;
            height: 48px;
            background: linear-gradient(to right,
                rgba(255, 255, 255, 0.5),
                rgba(220, 220, 220, 0.7),
                rgba(255, 255, 255, 0.5)
            );
            border: 2px solid rgba(120, 120, 120, 0.6);
            border-radius: 6px;
            position: absolute;
            bottom: 0;
            box-shadow: 2px 2px 8px rgba(0, 0, 0, 0.2);
        }

        .bottle-icon-cap {
            width: 30px;
            height: 12px;
            background: linear-gradient(to bottom, #b89968, #8b6914);
            border-radius: 6px 6px 3px 3px;
            position: absolute;
            top: 0;
            left: 50%;
            transform: translateX(-50%);
            box-shadow: 1px 1px 4px rgba(0, 0, 0, 0.3);
        }

        .bottle-icon-solid {
            position: absolute;
            bottom: 3px;
            left: 3px;
            right: 3px;
            height: 45%;
            border-radius: 2px 2px 4px 4px;
            box-shadow: inset -2px -2px 6px rgba(0, 0, 0, 0.3);
        }

        .bottle-icon-label {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            font-size: 7px;
            color: #000;
            background: rgba(255, 255, 255, 0.95);
            padding: 2px 4px;
            border-radius: 2px;
            font-weight: 700;
            white-space: nowrap;
        }

        /* 试剂瓶图标样式 */
        .reagent-bottle-icon {
            width: 40px;
            height: 50px;
            margin: 0 auto 5px;
            position: relative;
        }

        .reagent-icon-body {
            width: 100%;
            height: 40px;
            background: linear-gradient(to right,
                rgba(255, 255, 255, 0.4),
                rgba(200, 200, 200, 0.6),
                rgba(255, 255, 255, 0.4)
            );
            border: 2px solid rgba(100, 100, 100, 0.5);
            border-radius: 4px;
            position: absolute;
            bottom: 0;
            box-shadow: 2px 2px 6px rgba(0, 0, 0, 0.2);
        }

        .reagent-icon-cap {
            width: 22px;
            height: 10px;
            background: linear-gradient(to bottom, #a0826d, #8b4513);
            border-radius: 4px;
            position: absolute;
            top: 0;
            left: 50%;
            transform: translateX(-50%);
            box-shadow: 1px 1px 3px rgba(0, 0, 0, 0.3);
        }

        .reagent-icon-liquid {
            position: absolute;
            bottom: 2px;
            left: 2px;
            right: 2px;
            height: 70%;
            border-radius: 2px;
            box-shadow: inset -2px 0 5px rgba(255, 255, 255, 0.5);
        }

        .item-name {
            font-size: 11px;
            color: #333;
            font-weight: 500;
        }

        /* 3D实验台 */
        .workbench {
            flex: 1;
            background: rgba(255, 255, 255, 0.1);
            border-radius: 15px;
            position: relative;
            overflow: hidden;
            box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
            perspective: 1200px;
        }

        .scene-3d {
            width: 100%;
            height: 100%;
            position: relative;
            transform-style: preserve-3d;
            background: 
                radial-gradient(ellipse at center top, 
                    rgba(135, 206, 250, 0.3) 0%, 
                    rgba(70, 130, 180, 0.2) 50%, 
                    transparent 100%),
                linear-gradient(to bottom, 
                    #87CEEB 0%, 
                    #B0D4E3 30%,
                    #D2B48C 70%, 
                    #8B7355 100%);
        }

        /* 3D地板 */
        .floor-3d {
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 60%;
            background: 
                repeating-linear-gradient(
                    90deg,
                    #8B4513 0px,
                    #8B4513 50px,
                    #A0522D 50px,
                    #A0522D 100px
                ),
                linear-gradient(to bottom,
                    rgba(139, 69, 19, 0.9) 0%,
                    rgba(101, 67, 33, 1) 100%
                );
            transform: rotateX(60deg) translateY(100px);
            transform-origin: bottom;
            box-shadow: 
                0 -5px 20px rgba(0,0,0,0.3),
                inset 0 10px 30px rgba(0,0,0,0.2);
        }

        .wall-shelf {
            position: absolute;
            top: 15%;
            left: 10%;
            width: 80%;
            height: 8px;
            background: linear-gradient(to bottom, #654321, #4a3218);
            border-radius: 4px;
            box-shadow: 0 4px 10px rgba(0,0,0,0.4);
        }

        /* 拖拽区域 */
        .drop-zone {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            z-index: 10;
        }

        /* 3D实验器材基础样式 */
        .lab-equipment-3d {
            position: absolute;
            cursor: move;
            z-index: 100;
            transition: filter 0.2s, transform 0.1s ease-out;
            transform-style: preserve-3d;
            will-change: transform;
        }

        .lab-equipment-3d.dragging {
            cursor: grabbing;
            z-index: 999;
            filter: drop-shadow(0 15px 30px rgba(0, 0, 0, 0.6));
            transform: scale(1.05);
        }

        .lab-equipment-3d:hover:not(.dragging) {
            filter: drop-shadow(0 10px 20px rgba(0, 0, 0, 0.5));
            transform: translateY(-3px);
        }

        .lab-equipment-3d.selected {
            filter: drop-shadow(0 0 15px #FFD700);
            z-index: 200;
        }

        .lab-equipment-3d.attached {
            cursor: default;
            filter: drop-shadow(0 0 10px #4CAF50);
        }

        /* 3D烧杯 */
        .beaker-3d {
            width: 120px;
            height: 140px;
            position: relative;
            transform-style: preserve-3d;
        }

        .beaker-body {
            width: 100%;
            height: 100%;
            background: 
                linear-gradient(to right,
                    rgba(255, 255, 255, 0.1) 0%,
                    rgba(200, 230, 255, 0.3) 20%,
                    rgba(200, 230, 255, 0.5) 50%,
                    rgba(200, 230, 255, 0.3) 80%,
                    rgba(255, 255, 255, 0.1) 100%
                );
            border: 3px solid rgba(150, 180, 220, 0.8);
            border-radius: 0 0 20px 20px;
            position: relative;
            box-shadow: 
                inset -5px 0 15px rgba(255, 255, 255, 0.6),
                inset 5px 0 15px rgba(0, 100, 200, 0.2),
                5px 5px 20px rgba(0, 0, 0, 0.3);
        }

        .beaker-rim {
            position: absolute;
            top: -5px;
            left: 0;
            width: 100%;
            height: 10px;
            background: linear-gradient(to bottom, 
                rgba(150, 180, 220, 0.9), 
                rgba(100, 150, 200, 0.7));
            border-radius: 50%;
            box-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
        }

        .beaker-liquid {
            position: absolute;
            bottom: 3px;
            left: 3px;
            right: 3px;
            height: 0%;
            background: blue;
            border-radius: 0 0 17px 17px;
            transition: height 0.5s ease, background 0.5s ease;
            box-shadow: 
                inset -3px 0 10px rgba(255, 255, 255, 0.5),
                inset 3px 0 10px rgba(0, 0, 0, 0.2);
        }

        /* 容器内的固体颗粒 */
        .solid-particles-container {
            position: absolute;
            bottom: 3px;
            left: 3px;
            right: 3px;
            height: 30px;
            pointer-events: none;
            z-index: 5;
        }

        .solid-particle {
            position: absolute;
            border-radius: 50%;
            box-shadow: 1px 1px 3px rgba(0, 0, 0, 0.4);
            animation: settle 1s ease-out forwards;
        }

        @keyframes settle {
            0% {
                transform: translateY(-100px) rotate(0deg);
                opacity: 0;
            }
            50% {
                opacity: 1;
            }
            100% {
                transform: translateY(0) rotate(360deg);
                opacity: 1;
            }
        }

        /* 3D试管 */
        .test-tube-3d {
            width: 50px;
            height: 130px;
            position: relative;
            transform-style: preserve-3d;
        }

        .test-tube-body {
            width: 100%;
            height: 100%;
            background: 
                linear-gradient(to right,
                    rgba(255, 255, 255, 0.2) 0%,
                    rgba(200, 230, 255, 0.4) 30%,
                    rgba(200, 230, 255, 0.6) 50%,
                    rgba(200, 230, 255, 0.4) 70%,
                    rgba(255, 255, 255, 0.2) 100%
                );
            border: 2.5px solid rgba(150, 180, 220, 0.8);
            border-radius: 0 0 25px 25px;
            position: relative;
            box-shadow: 
                inset -3px 0 10px rgba(255, 255, 255, 0.7),
                inset 3px 0 10px rgba(0, 100, 200, 0.2),
                3px 3px 15px rgba(0, 0, 0, 0.3);
        }

        .test-tube-liquid {
            position: absolute;
            bottom: 2px;
            left: 2px;
            right: 2px;
            height: 0%;
            border-radius: 0 0 23px 23px;
            transition: height 0.5s ease, background 0.5s ease;
            box-shadow: inset -2px 0 8px rgba(255, 255, 255, 0.5);
        }

        /* 3D锥形瓶 */
        .flask-3d {
            width: 110px;
            height: 130px;
            position: relative;
            transform-style: preserve-3d;
        }

        .flask-neck-3d {
            width: 25px;
            height: 40px;
            background: 
                linear-gradient(to right,
                    rgba(255, 255, 255, 0.3),
                    rgba(200, 230, 255, 0.4),
                    rgba(255, 255, 255, 0.3)
                );
            border: 2px solid rgba(150, 180, 220, 0.8);
            position: absolute;
            top: 0;
            left: 50%;
            transform: translateX(-50%);
            box-shadow: 
                inset -2px 0 5px rgba(255, 255, 255, 0.6),
                2px 2px 10px rgba(0, 0, 0, 0.3);
        }

        .flask-body-3d {
            width: 110px;
            height: 95px;
            background: 
                linear-gradient(to right,
                    rgba(255, 255, 255, 0.2) 0%,
                    rgba(200, 230, 255, 0.4) 30%,
                    rgba(200, 230, 255, 0.6) 50%,
                    rgba(200, 230, 255, 0.4) 70%,
                    rgba(255, 255, 255, 0.2) 100%
                );
            border: 3px solid rgba(150, 180, 220, 0.8);
            clip-path: polygon(25% 0%, 75% 0%, 100% 100%, 0% 100%);
            position: absolute;
            bottom: 0;
            box-shadow: 
                inset -5px 0 15px rgba(255, 255, 255, 0.6),
                inset 5px 0 15px rgba(0, 100, 200, 0.2),
                5px 5px 20px rgba(0, 0, 0, 0.3);
        }

        .flask-liquid {
            position: absolute;
            bottom: 3px;
            left: 3px;
            right: 3px;
            height: 0%;
            clip-path: polygon(25% 0%, 75% 0%, 100% 100%, 0% 100%);
            transition: height 0.5s ease, background 0.5s ease;
            box-shadow: inset -3px 0 10px rgba(255, 255, 255, 0.5);
        }

        /* 容量瓶 */
        .volumetric-flask {
            width: 90px;
            height: 140px;
            position: relative;
        }

        .volumetric-bulb {
            width: 90px;
            height: 90px;
            background: 
                radial-gradient(ellipse at 30% 30%,
                    rgba(255, 255, 255, 0.6) 0%,
                    rgba(200, 230, 255, 0.4) 40%,
                    rgba(200, 230, 255, 0.6) 100%
                );
            border: 3px solid rgba(150, 180, 220, 0.8);
            border-radius: 50%;
            position: absolute;
            bottom: 0;
            box-shadow: 
                inset -8px -8px 20px rgba(255, 255, 255, 0.7),
                inset 8px 8px 20px rgba(0, 100, 200, 0.2),
                5px 5px 20px rgba(0, 0, 0, 0.3);
        }

        .volumetric-neck {
            width: 20px;
            height: 55px;
            background: 
                linear-gradient(to right,
                    rgba(255, 255, 255, 0.3),
                    rgba(200, 230, 255, 0.4),
                    rgba(255, 255, 255, 0.3)
                );
            border: 2px solid rgba(150, 180, 220, 0.8);
            position: absolute;
            top: 0;
            left: 50%;
            transform: translateX(-50%);
            box-shadow: 2px 2px 10px rgba(0, 0, 0, 0.3);
        }

        .volumetric-liquid {
            position: absolute;
            bottom: 3px;
            left: 3px;
            right: 3px;
            height: 0%;
            border-radius: 50%;
            transition: height 0.5s ease, background 0.5s ease;
            box-shadow: inset -5px -5px 15px rgba(255, 255, 255, 0.6);
        }

        /* 量筒 */
        .graduated-cylinder {
            width: 60px;
            height: 140px;
            position: relative;
        }

        .cylinder-body {
            width: 100%;
            height: 100%;
            background: 
                linear-gradient(to right,
                    rgba(255, 255, 255, 0.2),
                    rgba(200, 230, 255, 0.5),
                    rgba(255, 255, 255, 0.2)
                );
            border: 2.5px solid rgba(150, 180, 220, 0.8);
            border-radius: 0 0 5px 5px;
            box-shadow: 
                inset -3px 0 10px rgba(255, 255, 255, 0.7),
                3px 3px 15px rgba(0, 0, 0, 0.3);
        }

        .cylinder-liquid {
            position: absolute;
            bottom: 2px;
            left: 2px;
            right: 2px;
            height: 0%;
            border-radius: 0 0 3px 3px;
            transition: height 0.5s ease, background 0.5s ease;
        }

        /* 3D圆底烧瓶（新增） */
        .round-bottom-flask {
            width: 100px;
            height: 140px;
            position: relative;
            transform-style: preserve-3d;
        }

        .round-flask-neck {
            width: 22px;
            height: 50px;
            background: 
                linear-gradient(to right,
                    rgba(255, 255, 255, 0.3),
                    rgba(200, 230, 255, 0.4),
                    rgba(255, 255, 255, 0.3)
                );
            border: 2px solid rgba(150, 180, 220, 0.8);
            position: absolute;
            top: 0;
            left: 50%;
            transform: translateX(-50%);
            box-shadow: 
                inset -2px 0 5px rgba(255, 255, 255, 0.6),
                2px 2px 10px rgba(0, 0, 0, 0.3);
        }

        .round-flask-body {
            width: 100px;
            height: 100px;
            background: 
                radial-gradient(ellipse at 30% 30%,
                    rgba(255, 255, 255, 0.6) 0%,
                    rgba(200, 230, 255, 0.4) 40%,
                    rgba(200, 230, 255, 0.6) 100%
                );
            border: 3px solid rgba(150, 180, 220, 0.8);
            border-radius: 50%;
            position: absolute;
            bottom: 0;
            box-shadow: 
                inset -8px -8px 20px rgba(255, 255, 255, 0.7),
                inset 8px 8px 20px rgba(0, 100, 200, 0.2),
                5px 5px 20px rgba(0, 0, 0, 0.3);
        }

        .round-flask-liquid {
            position: absolute;
            bottom: 3px;
            left: 3px;
            right: 3px;
            height: 0%;
            border-radius: 50%;
            transition: height 0.5s ease, background 0.5s ease;
            box-shadow: inset -5px -5px 15px rgba(255, 255, 255, 0.6);
        }

        /* 3D酒精灯 */
        .alcohol-lamp-3d {
            width: 70px;
            height: 90px;
            position: relative;
            transform-style: preserve-3d;
        }

        .lamp-base-3d {
            width: 70px;
            height: 55px;
            background: 
                radial-gradient(ellipse at 30% 30%,
                    #ff8888 0%,
                    #ff6b6b 40%,
                    #ee5555 100%
                );
            border-radius: 0 0 35px 35px;
            position: absolute;
            bottom: 0;
            border: 2.5px solid #cc4444;
            box-shadow: 
                inset -5px -5px 15px rgba(255, 255, 255, 0.4),
                inset 5px 5px 15px rgba(0, 0, 0, 0.3),
                3px 5px 15px rgba(0, 0, 0, 0.4);
        }

        .lamp-wick-3d {
            width: 10px;
            height: 30px;
            background: linear-gradient(to bottom, #555, #333);
            position: absolute;
            top: 0;
            left: 50%;
            transform: translateX(-50%);
            border-radius: 2px;
            box-shadow: 2px 2px 5px rgba(0, 0, 0, 0.5);
        }

        .flame-3d {
            width: 40px;
            height: 50px;
            position: absolute;
            top: -45px;
            left: 50%;
            transform: translateX(-50%);
            background: 
                radial-gradient(ellipse at center,
                    #ffff00 0%,
                    #ffaa00 30%,
                    #ff6600 60%,
                    rgba(255, 102, 0, 0.3) 85%,
                    transparent 100%
                );
            border-radius: 50% 50% 50% 50% / 60% 60% 40% 40%;
            opacity: 0;
            transition: opacity 0.3s;
            filter: blur(3px);
            animation: flicker-3d 0.15s infinite;
            box-shadow: 
                0 0 20px rgba(255, 165, 0, 0.8),
                0 0 40px rgba(255, 140, 0, 0.5);
        }

        .alcohol-lamp-3d.lit .flame-3d {
            opacity: 1;
        }

        @keyframes flicker-3d {
            0%, 100% { transform: translateX(-50%) scale(1); }
            50% { transform: translateX(-50%) scale(1.05, 0.95); }
        }

        /* 试管架 */
        .test-tube-rack {
            width: 150px;
            height: 80px;
            position: relative;
        }

        .rack-base {
            width: 100%;
            height: 15px;
            background: linear-gradient(to bottom, #8B4513, #654321);
            border-radius: 3px;
            position: absolute;
            bottom: 0;
            box-shadow: 3px 3px 10px rgba(0, 0, 0, 0.5);
        }

        .rack-holes {
            display: flex;
            justify-content: space-around;
            position: absolute;
            bottom: 15px;
            width: 100%;
        }

        .rack-hole {
            width: 25px;
            height: 60px;
            background: 
                linear-gradient(to right,
                    #8B4513,
                    #A0522D,
                    #8B4513
                );
            border-radius: 50% 50% 0 0;
            box-shadow: 
                inset 2px 2px 5px rgba(0, 0, 0, 0.4),
                2px 2px 5px rgba(0, 0, 0, 0.3);
        }

        /* 铁架台 */
        .iron-stand {
            width: 120px;
            height: 180px;
            position: relative;
        }

        .stand-base {
            width: 120px;
            height: 20px;
            background: linear-gradient(to bottom, #666, #444);
            border-radius: 5px;
            position: absolute;
            bottom: 0;
            box-shadow: 3px 3px 15px rgba(0, 0, 0, 0.6);
        }

        .stand-rod {
            width: 12px;
            height: 160px;
            background: linear-gradient(to right, #888, #666, #888);
            position: absolute;
            bottom: 20px;
            left: 50%;
            transform: translateX(-50%);
            border-radius: 2px;
            box-shadow: 
                inset -2px 0 5px rgba(255, 255, 255, 0.3),
                2px 2px 10px rgba(0, 0, 0, 0.5);
        }

        .stand-clamp {
            width: 50px;
            height: 8px;
            background: linear-gradient(to bottom, #777, #555);
            position: absolute;
            right: 0;
            top: 60px;
            border-radius: 2px;
            box-shadow: 2px 2px 5px rgba(0, 0, 0, 0.5);
            cursor: pointer;
        }

        .stand-clamp.has-equipment {
            background: linear-gradient(to bottom, #4CAF50, #45a049);
        }

        .stand-attachments {
            position: absolute;
            width: 100%;
            height: 100%;
            pointer-events: none;
        }

        /* 三角架 - 修复错位和透视 */
        .tripod {
            width: 100px;
            height: 80px;
            position: relative;
        }
        
        .tripod-ring {
            width: 100px;
            height: 25px;
            border: 4px solid #666;
            border-radius: 50%;
            position: absolute;
            top: 0;
            left: 50%;
            transform: translateX(-50%);
            box-shadow: 
                inset 0 2px 4px rgba(0, 0, 0, 0.6),
                0 2px 4px rgba(0, 0, 0, 0.4);
            z-index: 2;
        }
        
        .tripod-legs {
            width: 100%;
            height: 100%;
            position: relative;
        }
        
        .tripod-leg {
            width: 6px;
            height: 70px;
            background: linear-gradient(to right, #999, #555);
            position: absolute;
            top: 12px;
            border-radius: 3px;
            box-shadow: 2px 2px 4px rgba(0,0,0,0.4);
        }
        
        .tripod-leg:nth-child(1) {
            left: 15px;
            transform: rotate(12deg);
            z-index: 3;
        }
        
        .tripod-leg:nth-child(2) {
            right: 15px;
            transform: rotate(-12deg);
            z-index: 3;
        }
        
        .tripod-leg:nth-child(3) {
            left: 50%;
            transform: translateX(-50%);
            z-index: 1;
            height: 65px;
            background: linear-gradient(to right, #777, #333);
        }

        /* 石棉网 - 扁平侧视图 */
        .asbestos-net {
            width: 110px;
            height: 15px;
            position: relative;
        }
        
        .net-frame {
            width: 100%;
            height: 100%;
            background: #ccc;
            border: 2px solid #888;
            border-radius: 50%;
            position: relative;
            box-shadow: 0 3px 5px rgba(0, 0, 0, 0.4);
            overflow: hidden;
        }
        
        .net-mesh {
            width: 100%;
            height: 100%;
            background: 
                repeating-linear-gradient(45deg, transparent, transparent 2px, rgba(100,100,100,0.4) 2px, rgba(100,100,100,0.4) 3px),
                repeating-linear-gradient(-45deg, transparent, transparent 2px, rgba(100,100,100,0.4) 2px, rgba(100,100,100,0.4) 3px);
        }
        
        .net-center {
            width: 60px;
            height: 8px;
            background: radial-gradient(ellipse at center, rgba(255, 255, 255, 1) 0%, rgba(230, 230, 230, 0.9) 100%);
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            border-radius: 50%;
            box-shadow: inset 0 0 3px rgba(0, 0, 0, 0.2);
        }

        /* 药匙 */
        .medicine-spoon {
            width: 100px;
            height: 25px;
            position: relative;
        }

        .spoon-handle {
            width: 70px;
            height: 4px;
            background: linear-gradient(to right, #888, #666);
            position: absolute;
            left: 0;
            top: 50%;
            transform: translateY(-50%);
            border-radius: 2px;
        }

        .spoon-head {
            width: 30px;
            height: 20px;
            background: 
                radial-gradient(ellipse at 40% 40%,
                    #aaa,
                    #888
                );
            position: absolute;
            right: 0;
            top: 50%;
            transform: translateY(-50%);
            border-radius: 50%;
            border: 2px solid #666;
            box-shadow: 2px 2px 8px rgba(0, 0, 0, 0.4);
        }

        .spoon-head.has-solid {
            background: 
                radial-gradient(ellipse at 40% 40%,
                    var(--solid-color, #888),
                    var(--solid-color, #666)
                );
        }

        /* 滴管 */
        .dropper {
            width: 30px;
            height: 120px;
            position: relative;
        }

        .dropper-bulb {
            width: 30px;
            height: 35px;
            background: 
                radial-gradient(circle at 30% 30%,
                    #ff9999,
                    #ff6666
                );
            border-radius: 50% 50% 40% 40%;
            position: absolute;
            top: 0;
            box-shadow: 
                inset -3px -3px 8px rgba(255, 255, 255, 0.4),
                2px 2px 8px rgba(0, 0, 0, 0.3);
        }

        .dropper-tube {
            width: 8px;
            height: 85px;
            background: 
                linear-gradient(to right,
                    rgba(200, 230, 255, 0.4),
                    rgba(200, 230, 255, 0.7),
                    rgba(200, 230, 255, 0.4)
                );
            border: 2px solid rgba(150, 180, 220, 0.8);
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            border-radius: 0 0 3px 3px;
            box-shadow: 2px 2px 8px rgba(0, 0, 0, 0.3);
        }

        .dropper-liquid {
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            height: 0%;
            border-radius: 0 0 2px 2px;
            transition: height 0.3s ease;
            opacity: 0.8;
        }

        /* 温度计 */
        .thermometer {
            width: 30px;
            height: 120px;
            position: relative;
        }

        .thermo-tube {
            width: 12px;
            height: 100%;
            background: 
                linear-gradient(to right,
                    rgba(200, 230, 255, 0.4),
                    rgba(200, 230, 255, 0.7),
                    rgba(200, 230, 255, 0.4)
                );
            border: 2px solid rgba(150, 180, 220, 0.8);
            border-radius: 6px;
            position: absolute;
            left: 50%;
            transform: translateX(-50%);
            box-shadow: 2px 2px 8px rgba(0, 0, 0, 0.3);
        }

        .thermo-bulb {
            width: 25px;
            height: 25px;
            background: 
                radial-gradient(circle at 35% 35%,
                    #ff6666,
                    #cc0000
                );
            border-radius: 50%;
            position: absolute;
            bottom: -5px;
            left: 50%;
            transform: translateX(-50%);
            box-shadow: 
                inset -3px -3px 8px rgba(255, 255, 255, 0.4),
                2px 2px 8px rgba(0, 0, 0, 0.4);
        }

        /* 3D试剂瓶（液体） */
        .reagent-bottle-3d {
            width: 60px;
            height: 85px;
            position: relative;
            transform-style: preserve-3d;
        }

        .bottle-body-3d {
            width: 60px;
            height: 70px;
            background: 
                linear-gradient(to right,
                    rgba(255, 255, 255, 0.3) 0%,
                    rgba(200, 200, 200, 0.5) 50%,
                    rgba(255, 255, 255, 0.3) 100%
                );
            border: 2.5px solid rgba(100, 100, 100, 0.6);
            border-radius: 5px;
            position: absolute;
            bottom: 0;
            box-shadow: 
                inset -5px 0 15px rgba(255, 255, 255, 0.6),
                inset 5px 0 10px rgba(0, 0, 0, 0.2),
                3px 5px 15px rgba(0, 0, 0, 0.4);
        }

        .bottle-cap-3d {
            width: 35px;
            height: 18px;
            background: 
                radial-gradient(ellipse at 40% 30%,
                    #a0826d,
                    #8b4513
                );
            border-radius: 5px;
            position: absolute;
            top: 0;
            left: 50%;
            transform: translateX(-50%);
            box-shadow: 
                inset -2px -2px 5px rgba(255, 255, 255, 0.3),
                2px 3px 8px rgba(0, 0, 0, 0.5);
        }

        .bottle-liquid-3d {
            position: absolute;
            bottom: 2px;
            left: 2px;
            right: 2px;
            height: 70%;
            border-radius: 3px;
            box-shadow: inset -3px 0 10px rgba(255, 255, 255, 0.5);
        }

        .bottle-label-3d {
            position: absolute;
            bottom: 8px;
            left: 50%;
            transform: translateX(-50%);
            font-size: 9px;
            color: #000;
            background: rgba(255, 255, 255, 0.9);
            padding: 3px 6px;
            border-radius: 3px;
            white-space: nowrap;
            box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
            font-weight: 600;
        }

        /* 广口瓶（固体试剂） */
        .wide-mouth-bottle {
            width: 80px;
            height: 100px;
            position: relative;
            transform-style: preserve-3d;
        }

        .wide-bottle-body {
            width: 80px;
            height: 85px;
            background: 
                linear-gradient(to right,
                    rgba(255, 255, 255, 0.4) 0%,
                    rgba(220, 220, 220, 0.6) 50%,
                    rgba(255, 255, 255, 0.4) 100%
                );
            border: 3px solid rgba(120, 120, 120, 0.7);
            border-radius: 8px;
            position: absolute;
            bottom: 0;
            box-shadow: 
                inset -6px 0 18px rgba(255, 255, 255, 0.7),
                inset 6px 0 12px rgba(0, 0, 0, 0.2),
                4px 6px 18px rgba(0, 0, 0, 0.4);
        }

        .wide-bottle-cap {
            width: 50px;
            height: 20px;
            background: 
                radial-gradient(ellipse at 40% 30%,
                    #b89968,
                    #8b6914
                );
            border-radius: 8px 8px 5px 5px;
            position: absolute;
            top: 0;
            left: 50%;
            transform: translateX(-50%);
            box-shadow: 
                inset -3px -3px 6px rgba(255, 255, 255, 0.4),
                3px 4px 10px rgba(0, 0, 0, 0.5);
        }

        .wide-bottle-solid {
            position: absolute;
            bottom: 5px;
            left: 5px;
            right: 5px;
            height: 40%;
            border-radius: 3px 3px 5px 5px;
            box-shadow: 
                inset -4px -4px 12px rgba(0, 0, 0, 0.3),
                inset 4px 4px 12px rgba(255, 255, 255, 0.3);
        }

        .wide-bottle-label {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            font-size: 10px;
            color: #000;
            background: rgba(255, 255, 255, 0.95);
            padding: 4px 8px;
            border-radius: 4px;
            white-space: nowrap;
            box-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
            font-weight: 700;
            border: 1px solid rgba(0, 0, 0, 0.1);
        }

        /* 返回主页按钮 */
        .home-button {
            position: absolute;
            top: 15px;
            left: 15px;
            background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
            color: white;
            border: none;
            padding: 12px 20px;
            border-radius: 10px;
            cursor: pointer;
            font-size: 14px;
            font-weight: 700;
            transition: all 0.3s;
            box-shadow: 0 4px 15px rgba(245, 87, 108, 0.4);
            display: flex;
            align-items: center;
            gap: 8px;
            z-index: 1001;
            backdrop-filter: blur(10px);
            text-decoration: none;
        }

        .home-button:hover {
            transform: translateY(-3px) scale(1.05);
            box-shadow: 0 6px 25px rgba(245, 87, 108, 0.6);
        }

        .home-button:active {
            transform: translateY(-1px) scale(1.02);
        }

        .home-button .icon {
            font-size: 18px;
            animation: bounce 2s infinite;
        }

        @keyframes bounce {
            0%, 100% {
                transform: translateX(0);
            }
            50% {
                transform: translateX(-3px);
            }
        }

        /* 控制面板 */
        .controls {
            position: absolute;
            top: 15px;
            right: 15px;
            background: rgba(255, 255, 255, 0.95);
            padding: 15px;
            border-radius: 12px;
            box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
            z-index: 1000;
            backdrop-filter: blur(10px);
        }

        .btn {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            border: none;
            padding: 10px 16px;
            border-radius: 8px;
            cursor: pointer;
            margin: 4px;
            font-size: 13px;
            font-weight: 600;
            transition: all 0.3s;
            box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
            display: inline-flex;
            align-items: center;
            gap: 5px;
        }

        .btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(102, 126, 234, 0.6);
        }

        .btn:active {
            transform: translateY(0);
        }

        .btn.danger {
            background: linear-gradient(135deg, #ff6b6b 0%, #ee5555 100%);
            box-shadow: 0 4px 15px rgba(255, 107, 107, 0.4);
        }

        .btn.danger:hover {
            box-shadow: 0 6px 20px rgba(255, 107, 107, 0.6);
        }

        .btn.success {
            background: linear-gradient(135deg, #51cf66 0%, #37b24d 100%);
            box-shadow: 0 4px 15px rgba(81, 207, 102, 0.4);
        }

        /* 反应效果 */
        .bubble {
            position: absolute;
            border-radius: 50%;
            background: radial-gradient(circle at 30% 30%, 
                rgba(255, 255, 255, 0.9), 
                rgba(200, 230, 255, 0.6));
            box-shadow: 
                inset -2px -2px 5px rgba(255, 255, 255, 0.8),
                2px 2px 5px rgba(0, 0, 0, 0.2);
            animation: rise 2.5s infinite;
        }

        @keyframes rise {
            0% {
                transform: translateY(0) scale(1);
                opacity: 0;
            }
            10% {
                opacity: 1;
            }
            90% {
                opacity: 1;
            }
            100% {
                transform: translateY(-120px) scale(1.8);
                opacity: 0;
            }
        }

        .precipitate {
            position: absolute;
            border-radius: 50%;
            animation: fall 3s infinite;
            box-shadow: 1px 1px 3px rgba(0, 0, 0, 0.3);
        }

        @keyframes fall {
            0% {
                transform: translateY(-60px) rotate(0deg);
                opacity: 0;
            }
            10% {
                opacity: 1;
            }
            90% {
                opacity: 0.8;
            }
            100% {
                transform: translateY(80px) rotate(360deg);
                opacity: 0;
            }
        }

        .steam {
            position: absolute;
            width: 30px;
            height: 30px;
            background: radial-gradient(circle, 
                rgba(255, 255, 255, 0.6) 0%, 
                rgba(200, 230, 255, 0.3) 50%,
                transparent 100%);
            border-radius: 50%;
            filter: blur(8px);
            animation: steam-rise 3s infinite;
        }

        @keyframes steam-rise {
            0% {
                transform: translateY(0) scale(0.5);
                opacity: 0;
            }
            20% {
                opacity: 0.8;
            }
            80% {
                opacity: 0.5;
            }
            100% {
                transform: translateY(-100px) scale(2);
                opacity: 0;
            }
        }

        /* 实验说明 */
        .experiment-info {
            position: absolute;
            bottom: 15px;
            left: 15px;
            background: rgba(255, 255, 255, 0.98);
            padding: 15px 20px;
            border-radius: 10px;
            max-width: 500px;
            box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
            z-index: 1000;
            display: none;
            backdrop-filter: blur(10px);
            border-left: 4px solid #667eea;
        }

        .experiment-info.show {
            display: block;
            animation: slideIn 0.3s ease-out;
        }

        @keyframes slideIn {
            from {
                transform: translateX(-20px);
                opacity: 0;
            }
            to {
                transform: translateX(0);
                opacity: 1;
            }
        }

        .experiment-info h3 {
            color: #1e3c72;
            margin-bottom: 8px;
            font-size: 15px;
            font-weight: 700;
        }

        .experiment-info p {
            color: #555;
            font-size: 13px;
            line-height: 1.6;
        }

        /* 删除区域 */
        .delete-zone {
            position: absolute;
            bottom: 20px;
            right: 20px;
            width: 70px;
            height: 70px;
            background: 
                radial-gradient(circle at 30% 30%,
                    rgba(255, 107, 107, 1),
                    rgba(238, 85, 85, 1)
                );
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 30px;
            color: white;
            z-index: 1000;
            transition: all 0.3s;
            opacity: 0.6;
            box-shadow: 0 5px 20px rgba(255, 107, 107, 0.5);
        }

        .delete-zone:hover, .delete-zone.active {
            opacity: 1;
            transform: scale(1.15);
            box-shadow: 0 8px 30px rgba(255, 107, 107, 0.8);
        }

        /* 滚动条 */
        .sidebar::-webkit-scrollbar {
            width: 8px;
        }

        .sidebar::-webkit-scrollbar-track {
            background: rgba(240, 240, 240, 0.5);
            border-radius: 4px;
        }

        .sidebar::-webkit-scrollbar-thumb {
            background: linear-gradient(135deg, #667eea, #764ba2);
            border-radius: 4px;
        }

        .sidebar::-webkit-scrollbar-thumb:hover {
            background: linear-gradient(135deg, #5568d3, #6a3f8f);
        }

        /* ========== 下拉面板样式 ========== */
        /* 按钮容器 - 相对定位 */
        .dropdown-container {
            position: relative;
            display: inline-block;
        }

        /* 下拉面板 */
        .dropdown-panel {
            position: absolute;
            top: calc(100% + 8px);
            right: 0;
            min-width: 280px;
            max-width: 320px;
            max-height: 60vh;
            background: rgba(0, 0, 0, 0.85);
            backdrop-filter: blur(8px);
            border-radius: 8px;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3),
                        0 8px 24px rgba(0, 0, 0, 0.2);
            padding: 16px;
            z-index: 1001;
            opacity: 0;
            transform: translateY(-10px);
            visibility: hidden;
            transition: opacity 0.3s ease-in-out,
                        transform 0.3s ease-in-out,
                        visibility 0.3s ease-in-out;
            /* 关键：面板背景区域事件穿透 */
            pointer-events: none;
        }

        .dropdown-panel.show {
            opacity: 1;
            transform: translateY(0);
            visibility: visible;
        }

        /* 面板内容区域 - 允许交互 */
        .dropdown-content {
            pointer-events: auto;
            overflow-y: auto;
            max-height: calc(60vh - 32px);
            color: #FFFFFF;
            font-size: 14px;
            line-height: 1.6;
        }

        /* 面板滚动条 */
        .dropdown-content::-webkit-scrollbar {
            width: 6px;
        }

        .dropdown-content::-webkit-scrollbar-track {
            background: rgba(255, 255, 255, 0.1);
            border-radius: 3px;
        }

        .dropdown-content::-webkit-scrollbar-thumb {
            background: rgba(255, 255, 255, 0.3);
            border-radius: 3px;
        }

        /* 指示箭头 */
        .dropdown-arrow {
            position: absolute;
            top: -8px;
            right: 20px;
            width: 0;
            height: 0;
            border-left: 8px solid transparent;
            border-right: 8px solid transparent;
            border-bottom: 8px solid rgba(0, 0, 0, 0.85);
        }

        /* 面板标题 */
        .dropdown-title {
            font-size: 16px;
            font-weight: 700;
            margin-bottom: 12px;
            color: #FFFFFF;
            border-bottom: 1px solid rgba(255, 255, 255, 0.2);
            padding-bottom: 8px;
        }

        /* 面板列表项 */
        .dropdown-content ul {
            margin: 0;
            padding-left: 20px;
        }

        .dropdown-content li {
            margin-bottom: 8px;
        }

        .dropdown-content strong {
            color: #667eea;
        }

        .dropdown-content .warning {
            color: #ffaa00;
        }

        .dropdown-content .success {
            color: #51cf66;
        }

        /* 响应式处理 */
        @media (max-width: 768px) {
            .dropdown-panel {
                max-width: calc(80vw - 20px);
                right: 50%;
                transform: translateX(50%) translateY(-10px);
            }

            .dropdown-panel.show {
                transform: translateX(50%) translateY(0);
            }

            .dropdown-arrow {
                right: 50%;
                transform: translateX(50%);
            }
        }

        /* ====== 横屏模式提示遮罩 ====== */
        .landscape-overlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: linear-gradient(135deg, rgba(30, 60, 114, 0.98) 0%, rgba(42, 82, 152, 0.98) 100%);
            z-index: 9999;
            display: none;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            padding: 2rem;
            backdrop-filter: blur(10px);
        }

        .landscape-overlay.show {
            display: flex;
        }

        .landscape-icon {
            font-size: 6rem;
            animation: rotateDevice 2s ease-in-out infinite;
            margin-bottom: 1.5rem;
        }

        @keyframes rotateDevice {
            0%, 100% { transform: rotate(0deg); }
            25% { transform: rotate(-90deg); }
            50% { transform: rotate(-90deg); }
            75% { transform: rotate(0deg); }
        }

        .landscape-title {
            font-size: 2rem;
            color: #ffffff;
            margin-bottom: 1rem;
            text-align: center;
            text-shadow: 0 0 10px rgba(100, 255, 218, 0.5);
        }

        .landscape-message {
            font-size: 1.1rem;
            color: #e0e6ed;
            text-align: center;
            max-width: 300px;
            line-height: 1.6;
            margin-bottom: 2rem;
        }

        .landscape-hint {
            font-size: 0.9rem;
            color: #64ffda;
            opacity: 0.8;
            animation: pulseHint 1.5s ease-in-out infinite;
        }

        @keyframes pulseHint {
            0%, 100% { opacity: 0.5; }
            50% { opacity: 1; }
        }

        /* 移动端按钮优化 */
        .home-button, .btn {
            min-height: 44px;
            min-width: 80px;
        }

        /* 安全区域适配 */
        @supports (padding: env(safe-area-inset-bottom)) {
            .home-button {
                left: max(15px, env(safe-area-inset-left));
            }
            .controls {
                right: max(15px, env(safe-area-inset-right));
            }
        }

        /* ====== 移动端拖拽相关样式 ====== */
        /* 拖拽预览元素 */
        .drag-preview {
            position: fixed;
            pointer-events: none;
            z-index: 10000;
            transition: transform 0.1s ease;
        }

        /* 操作区域拖拽覆盖状态 */
        #dropZone.drag-over {
            border: 3px dashed #64ffda !important;
            background: rgba(100, 255, 218, 0.1) !important;
        }

        /* 移动端仪器栏项目触摸反馈 */
        .item:active {
            transform: scale(0.95);
        }

        /* ====== 实验安全提示系统 ====== */
        /* 试剂卡片作为危险性徽章的定位容器 */
        .item {
            position: relative;
        }

        /* 试剂瓶右上角的危险性标识徽章 */
        .safety-badge {
            position: absolute;
            top: 3px;
            right: 4px;
            font-size: 13px;
            line-height: 1;
            pointer-events: none;
            filter: drop-shadow(0 1px 2px rgba(0, 0, 0, 0.25));
        }

        /* 顶部滑入式安全提示条 */
        #safetyAlert {
            position: fixed;
            top: 16px;
            left: 50%;
            transform: translate(-50%, -160%);
            min-width: 260px;
            max-width: min(90vw, 520px);
            padding: 12px 18px;
            border-radius: 12px;
            background: linear-gradient(135deg, #fff4e5, #ffe0b2);
            border: 2px solid #ff9f43;
            box-shadow: 0 10px 30px rgba(255, 120, 0, 0.35);
            color: #7a3e00;
            font-size: 13px;
            line-height: 1.6;
            z-index: 9000;
            opacity: 0;
            pointer-events: none;
            transition: transform 0.35s cubic-bezier(0.2, 0.9, 0.4, 1.1), opacity 0.35s;
        }

        #safetyAlert.show {
            transform: translate(-50%, 0);
            opacity: 1;
        }

        #safetyAlert .safety-alert-title {
            font-weight: 700;
            margin-bottom: 4px;
            color: #d9480f;
        }

        /* 异常操作提示条：红色警示，与常规安全提示区分 */
        #safetyAlert.danger {
            background: linear-gradient(135deg, #ffebee, #ffcdd2);
            border-color: #e53935;
            box-shadow: 0 10px 30px rgba(229, 57, 53, 0.4);
            color: #7f1d1d;
        }

        #safetyAlert.danger .safety-alert-title {
            color: #b91c1c;
        }

        /* 异常容器：红色警示脉冲。只改 filter，避免覆盖器皿定位用的 transform */
        .lab-hazard {
            animation: labHazardPulse 0.65s ease-in-out 4;
        }

        @keyframes labHazardPulse {
            0%, 100% { filter: drop-shadow(0 0 0 rgba(229, 57, 53, 0)); }
            50% { filter: drop-shadow(0 0 14px rgba(229, 57, 53, 0.9)) brightness(1.2); }
        }

        /* 异常烟雾：浑浊灰白烟团向上飘散 */
        .hazard-smoke {
            position: absolute;
            width: 34px;
            height: 34px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(190, 190, 190, 0.8), rgba(130, 130, 130, 0));
            pointer-events: none;
            animation: hazardSmokeUp 2.2s ease-out forwards;
        }

        @keyframes hazardSmokeUp {
            0% { opacity: 0; transform: translateY(0) scale(0.6); }
            25% { opacity: 0.85; }
            100% { opacity: 0; transform: translateY(-70px) scale(1.9); }
        }

        /* 首次进入实验室的安全须知弹窗 */
        .safety-modal {
            position: fixed;
            inset: 0;
            z-index: 10000;
            display: none;
            align-items: center;
            justify-content: center;
            padding: 20px;
            background: rgba(10, 25, 45, 0.72);
            backdrop-filter: blur(6px);
        }

        .safety-modal.show {
            display: flex;
        }

        .safety-modal-card {
            width: min(560px, 94vw);
            max-height: 88vh;
            overflow-y: auto;
            padding: 24px 28px 20px;
            border-radius: 20px;
            background: #fff;
            box-shadow: 0 24px 60px rgba(0, 0, 0, 0.4);
            animation: safetyPop 0.3s ease-out;
        }

        @keyframes safetyPop {
            from { transform: scale(0.94); opacity: 0; }
            to { transform: scale(1); opacity: 1; }
        }

        .safety-modal-card h2 {
            font-size: 19px;
            color: #2b3a67;
            margin-bottom: 6px;
        }

        .safety-modal-sub {
            font-size: 13px;
            color: #7a869a;
            margin-bottom: 16px;
        }

        .safety-rule-list {
            list-style: none;
            display: grid;
            gap: 10px;
            margin-bottom: 18px;
        }

        .safety-rule-list li {
            display: flex;
            gap: 10px;
            padding: 9px 12px;
            font-size: 13px;
            line-height: 1.6;
            color: #34495e;
            background: #f6f8fc;
            border-left: 4px solid #667eea;
            border-radius: 8px;
        }

        .safety-ack {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 16px;
            font-size: 13px;
            color: #34495e;
            cursor: pointer;
            user-select: none;
        }

        .safety-ack input {
            width: 18px;
            height: 18px;
            accent-color: #51cf66;
            cursor: pointer;
        }

        .safety-modal-actions {
            display: flex;
            justify-content: flex-end;
            gap: 10px;
        }

        .safety-modal-actions .btn:disabled {
            opacity: 0.45;
            cursor: not-allowed;
            box-shadow: none;
        }

        /* 安全须知按钮 */
        .btn.warning {
            background: linear-gradient(135deg, #ffa94d 0%, #f76707 100%);
            box-shadow: 0 4px 15px rgba(247, 103, 7, 0.4);
        }

        .btn.warning:hover {
            box-shadow: 0 6px 20px rgba(247, 103, 7, 0.6);
        }

        /* 安全面板内的危险性标识图例 */
        .ghs-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 8px;
            margin: 6px 0;
        }

        .ghs-item {
            display: flex;
            align-items: center;
            gap: 6px;
            padding: 6px 8px;
            font-size: 12px;
            color: #444;
            background: #f7f7fa;
            border-radius: 6px;
        }

        /* ============================================================
           科幻实验室主题层
           设计语言：深空底色 + 青色 HUD 描边 + 等宽字标注
           说明：本层统一覆盖上方基础配色，不改变任何布局与交互逻辑
           ============================================================ */
        :root {
            --sci-bg-deep: #050b13;
            --sci-panel: rgba(10, 24, 40, 0.9);
            --sci-line: rgba(46, 230, 255, 0.22);
            --sci-line-strong: rgba(46, 230, 255, 0.55);
            --sci-cyan: #2ee6ff;
            --sci-text: #d6ecf7;
            --sci-text-dim: #8aa9bd;
            --sci-mono: 'JetBrains Mono', 'Consolas', 'Courier New', monospace;
        }

        body {
            background:
                radial-gradient(ellipse at 50% -10%, rgba(46, 230, 255, 0.14), transparent 55%),
                radial-gradient(ellipse at 85% 110%, rgba(120, 90, 255, 0.10), transparent 60%),
                linear-gradient(160deg, #050b13 0%, #0a1524 55%, #060d18 100%);
            color: var(--sci-text);
        }

        /* 全局细网格，营造 HUD 背景质感 */
        body::before {
            content: "";
            position: fixed;
            inset: 0;
            z-index: 0;
            pointer-events: none;
            background-image:
                linear-gradient(rgba(46, 230, 255, 0.04) 1px, transparent 1px),
                linear-gradient(90deg, rgba(46, 230, 255, 0.04) 1px, transparent 1px);
            background-size: 44px 44px;
        }

        .container {
            position: relative;
            z-index: 1;
        }

        /* ---------- 左侧器材侧栏 ---------- */
        .sidebar {
            background: linear-gradient(180deg, rgba(12, 28, 46, 0.92), rgba(7, 17, 30, 0.92));
            border: 1px solid var(--sci-line);
            border-radius: 14px;
            box-shadow:
                0 18px 50px rgba(0, 0, 0, 0.55),
                inset 0 1px 0 rgba(255, 255, 255, 0.05);
            backdrop-filter: blur(14px);
            position: relative;
        }

        /* 侧栏顶部发光条 */
        .sidebar::before {
            content: "";
            position: absolute;
            top: 0;
            left: 14px;
            right: 14px;
            height: 2px;
            background: linear-gradient(90deg, transparent, var(--sci-cyan), transparent);
            opacity: 0.75;
        }

        .sidebar h2 {
            color: var(--sci-cyan);
            font-family: var(--sci-mono);
            font-size: 17px;
            font-weight: 700;
            letter-spacing: 0.14em;
            border-bottom: 1px solid var(--sci-line);
            padding-bottom: 10px;
            text-shadow: 0 0 18px rgba(46, 230, 255, 0.55);
        }

        .category h3 {
            color: var(--sci-text-dim);
            font-family: var(--sci-mono);
            font-size: 11px;
            letter-spacing: 0.16em;
            background: none;
            border-left: 2px solid var(--sci-line-strong);
            border-radius: 0;
            padding: 3px 0 3px 9px;
        }

        .item {
            background: linear-gradient(160deg, rgba(20, 40, 62, 0.9), rgba(11, 24, 40, 0.9));
            border: 1px solid rgba(46, 230, 255, 0.14);
            border-radius: 9px;
            box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.05);
        }

        .item:hover {
            background: linear-gradient(160deg, rgba(28, 56, 84, 0.95), rgba(14, 31, 50, 0.95));
            border-color: var(--sci-line-strong);
            box-shadow:
                0 0 0 1px rgba(46, 230, 255, 0.18),
                0 8px 24px rgba(0, 0, 0, 0.5),
                0 0 22px rgba(46, 230, 255, 0.28);
        }

        .item-name {
            color: #bcd8e8;
            letter-spacing: 0.04em;
        }

        /* 器材图标在深色底上的冷光描边 */
        .item .item-icon {
            filter: drop-shadow(0 0 6px rgba(46, 230, 255, 0.35));
        }

        .item .reagent-icon-body,
        .item .bottle-icon-body {
            box-shadow:
                inset 0 0 10px rgba(46, 230, 255, 0.25),
                2px 2px 8px rgba(0, 0, 0, 0.4);
        }

        /* ---------- 右侧 3D 实验台 ---------- */
        .workbench {
            background:
                radial-gradient(ellipse at 50% 20%, rgba(46, 230, 255, 0.06), transparent 60%),
                rgba(5, 12, 22, 0.6);
            border: 1px solid rgba(46, 230, 255, 0.14);
            border-radius: 14px;
            box-shadow:
                0 18px 60px rgba(0, 0, 0, 0.6),
                inset 0 0 80px rgba(46, 230, 255, 0.05);
        }

        .scene-3d {
            background:
                radial-gradient(ellipse at 50% 0%, rgba(46, 230, 255, 0.16) 0%, transparent 55%),
                radial-gradient(ellipse at 50% 45%, rgba(20, 60, 90, 0.45) 0%, transparent 70%),
                linear-gradient(to bottom, #071120 0%, #0a1a2c 45%, #071322 100%);
        }

        /* 地板：青色透视网格，替代原木质地板 */
        .floor-3d {
            background:
                repeating-linear-gradient(90deg, rgba(46, 230, 255, 0.16) 0 1px, transparent 1px 60px),
                repeating-linear-gradient(0deg, rgba(46, 230, 255, 0.12) 0 1px, transparent 1px 60px),
                linear-gradient(to bottom, rgba(6, 18, 32, 0.9) 0%, rgba(4, 10, 20, 1) 100%);
            box-shadow:
                0 -1px 0 rgba(46, 230, 255, 0.35),
                0 -20px 60px rgba(46, 230, 255, 0.12);
        }

        .wall-shelf {
            height: 6px;
            background: linear-gradient(to bottom, rgba(46, 230, 255, 0.55), rgba(46, 230, 255, 0.1));
            border-radius: 3px;
            box-shadow:
                0 0 18px rgba(46, 230, 255, 0.45),
                0 4px 16px rgba(0, 0, 0, 0.6);
        }

        /* 实验台四角 HUD 标记 */
        .workbench::before,
        .workbench::after {
            content: "";
            position: absolute;
            width: 26px;
            height: 26px;
            z-index: 5;
            pointer-events: none;
            border-style: solid;
            border-color: rgba(46, 230, 255, 0.5);
        }

        .workbench::before {
            top: 10px;
            left: 10px;
            border-width: 1px 0 0 1px;
        }

        .workbench::after {
            bottom: 10px;
            right: 10px;
            border-width: 0 1px 1px 0;
        }

        /* 缓慢下移的扫描线 */
        .scene-3d::after {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 2px;
            z-index: 6;
            opacity: 0;
            pointer-events: none;
            background: linear-gradient(90deg, transparent, rgba(46, 230, 255, 0.55), transparent);
            animation: hudScan 9s linear infinite;
        }

        @keyframes hudScan {
            0%   { top: 0;    opacity: 0; }
            8%   { opacity: 0.55; }
            92%  { opacity: 0.55; }
            100% { top: 100%; opacity: 0; }
        }

        /* ---------- 顶部按钮与 HUD ---------- */
        .home-button {
            background: rgba(46, 230, 255, 0.08);
            border: 1px solid rgba(46, 230, 255, 0.4);
            border-radius: 8px;
            color: #bfeaf8;
            font-family: var(--sci-mono);
            letter-spacing: 0.05em;
            box-shadow: 0 0 20px rgba(46, 230, 255, 0.18);
        }

        .home-button:hover {
            background: rgba(46, 230, 255, 0.18);
            border-color: rgba(46, 230, 255, 0.85);
            box-shadow: 0 0 26px rgba(46, 230, 255, 0.45);
        }

        .controls {
            background: linear-gradient(180deg, rgba(12, 28, 46, 0.92), rgba(7, 17, 30, 0.92));
            border: 1px solid rgba(46, 230, 255, 0.2);
            border-radius: 12px;
            box-shadow:
                0 12px 36px rgba(0, 0, 0, 0.55),
                inset 0 1px 0 rgba(255, 255, 255, 0.05);
            backdrop-filter: blur(12px);
        }

        .btn {
            background: rgba(46, 230, 255, 0.08);
            color: #b9e9f7;
            border: 1px solid rgba(46, 230, 255, 0.38);
            border-radius: 7px;
            font-family: var(--sci-mono);
            font-size: 12px;
            letter-spacing: 0.06em;
            box-shadow: 0 0 0 rgba(46, 230, 255, 0);
        }

        .btn:hover {
            background: rgba(46, 230, 255, 0.18);
            color: #eafcff;
            border-color: rgba(46, 230, 255, 0.8);
            box-shadow: 0 0 18px rgba(46, 230, 255, 0.4);
        }

        .btn.danger {
            background: rgba(255, 92, 108, 0.1);
            color: #ffb3ba;
            border-color: rgba(255, 92, 108, 0.45);
            box-shadow: 0 0 16px rgba(255, 92, 108, 0.16);
        }

        .btn.danger:hover {
            background: rgba(255, 92, 108, 0.22);
            color: #ffe3e6;
            border-color: rgba(255, 92, 108, 0.85);
            box-shadow: 0 0 18px rgba(255, 92, 108, 0.45);
        }

        .btn.success {
            background: rgba(52, 211, 153, 0.1);
            color: #9cf0cd;
            border-color: rgba(52, 211, 153, 0.45);
            box-shadow: 0 0 16px rgba(52, 211, 153, 0.16);
        }

        .btn.success:hover {
            background: rgba(52, 211, 153, 0.22);
            color: #d9fff0;
            border-color: rgba(52, 211, 153, 0.85);
            box-shadow: 0 0 18px rgba(52, 211, 153, 0.45);
        }

        .btn.warning {
            background: rgba(251, 191, 36, 0.1);
            color: #ffe1a3;
            border-color: rgba(251, 191, 36, 0.45);
            box-shadow: 0 0 16px rgba(251, 191, 36, 0.16);
        }

        .btn.warning:hover {
            background: rgba(251, 191, 36, 0.22);
            color: #fff3d1;
            border-color: rgba(251, 191, 36, 0.85);
            box-shadow: 0 0 18px rgba(251, 191, 36, 0.45);
        }

        /* ---------- 实验提示 HUD ---------- */
        .experiment-info {
            background: linear-gradient(180deg, rgba(10, 26, 44, 0.95), rgba(6, 15, 26, 0.95));
            border: 1px solid rgba(46, 230, 255, 0.25);
            border-left: 3px solid var(--sci-cyan);
            border-radius: 10px;
            box-shadow:
                0 14px 40px rgba(0, 0, 0, 0.6),
                0 0 26px rgba(46, 230, 255, 0.12);
            backdrop-filter: blur(12px);
        }

        .experiment-info h3 {
            color: var(--sci-cyan);
            font-family: var(--sci-mono);
            font-size: 12px;
            letter-spacing: 0.16em;
            text-transform: uppercase;
        }

        .experiment-info p {
            color: var(--sci-text);
        }

        /* ---------- 删除区 ---------- */
        .delete-zone {
            background: radial-gradient(circle at 30% 30%, rgba(255, 92, 108, 0.9), rgba(150, 24, 38, 0.95));
            border: 1px solid rgba(255, 92, 108, 0.6);
            box-shadow:
                0 0 26px rgba(255, 92, 108, 0.42),
                inset 0 0 18px rgba(255, 255, 255, 0.12);
        }

        .delete-zone:hover,
        .delete-zone.active {
            border-color: rgba(255, 150, 160, 0.95);
            box-shadow: 0 0 40px rgba(255, 92, 108, 0.75);
        }

        /* ---------- 下拉面板 ---------- */
        .dropdown-panel {
            background: linear-gradient(180deg, rgba(9, 22, 38, 0.97), rgba(5, 13, 24, 0.97));
            border: 1px solid rgba(46, 230, 255, 0.28);
            border-radius: 10px;
            box-shadow:
                0 18px 46px rgba(0, 0, 0, 0.65),
                0 0 30px rgba(46, 230, 255, 0.14);
        }

        .dropdown-arrow {
            border-bottom-color: rgba(9, 22, 38, 0.97);
        }

        .dropdown-title {
            color: var(--sci-cyan);
            font-family: var(--sci-mono);
            font-size: 13px;
            letter-spacing: 0.12em;
            border-bottom: 1px solid rgba(46, 230, 255, 0.22);
        }

        .dropdown-content {
            color: #c6dfec;
            font-size: 13px;
        }

        .dropdown-content strong {
            color: #7fe9ff;
        }

        .dropdown-content .warning {
            color: #ffc978;
        }

        .dropdown-content .success {
            color: #7ce8b8;
        }

        .ghs-item {
            background: rgba(46, 230, 255, 0.07);
            border: 1px solid rgba(46, 230, 255, 0.15);
            color: #c6dfec;
        }

        /* ---------- 滚动条 ---------- */
        .sidebar::-webkit-scrollbar-track {
            background: rgba(46, 230, 255, 0.06);
        }

        .sidebar::-webkit-scrollbar-thumb {
            background: linear-gradient(180deg, rgba(46, 230, 255, 0.55), rgba(46, 230, 255, 0.25));
        }

        /* ---------- 安全须知弹窗同步深色化 ---------- */
        .safety-modal {
            background: rgba(3, 9, 16, 0.82);
        }

        .safety-modal-card {
            background: linear-gradient(180deg, rgba(10, 24, 40, 0.97), rgba(5, 12, 22, 0.98));
            border: 1px solid rgba(46, 230, 255, 0.3);
            box-shadow:
                0 30px 80px rgba(0, 0, 0, 0.7),
                0 0 60px rgba(46, 230, 255, 0.12);
            color: var(--sci-text);
        }

        .safety-modal-card h2 {
            color: var(--sci-cyan);
            font-family: var(--sci-mono);
            letter-spacing: 0.1em;
            text-shadow: 0 0 20px rgba(46, 230, 255, 0.5);
        }

        .safety-modal-sub {
            color: var(--sci-text-dim);
        }

        .safety-rule-list li {
            background: rgba(46, 230, 255, 0.05);
            border-left: 2px solid rgba(46, 230, 255, 0.55);
            color: #c6dfec;
        }

        .safety-ack {
            color: #c6dfec;
        }

        /* 侧栏标题英文副标，强化专业感 */
        .sidebar h2 .sci-sub {
            display: block;
            margin-top: 4px;
            font-size: 9px;
            font-weight: 400;
            letter-spacing: 0.28em;
            color: rgba(138, 169, 189, 0.85);
            text-shadow: none;
        }

        /* 横屏提示遮罩同步深空配色 */
        .landscape-overlay {
            background:
                radial-gradient(ellipse at 50% 30%, rgba(46, 230, 255, 0.12), transparent 60%),
                linear-gradient(160deg, #050b13 0%, #0a1524 60%, #060d18 100%);
        }

        .landscape-title {
            color: var(--sci-cyan);
            font-family: var(--sci-mono);
            letter-spacing: 0.1em;
            text-shadow: 0 0 24px rgba(46, 230, 255, 0.5);
        }

        .landscape-message,
        .landscape-hint {
            color: var(--sci-text-dim);
        }

        /* ---------- 功能分区 ---------- */
        .zone-block {
            margin-bottom: 16px;
            padding: 10px 10px 4px;
            border: 1px solid rgba(46, 230, 255, 0.12);
            border-radius: 10px;
            background: rgba(46, 230, 255, 0.025);
        }

        .zone-head {
            display: flex;
            align-items: center;
            gap: 7px;
            padding-bottom: 7px;
            border-bottom: 1px dashed rgba(46, 230, 255, 0.16);
        }

        .zone-icon {
            font-size: 15px;
        }

        .zone-name {
            color: #9fe8fa;
            font-size: 12px;
            font-weight: 700;
            letter-spacing: 0.08em;
        }

        .zone-tag {
            margin-left: auto;
            padding: 1px 6px;
            font-family: var(--sci-mono);
            font-size: 8px;
            letter-spacing: 0.18em;
            color: rgba(46, 230, 255, 0.7);
            border: 1px solid rgba(46, 230, 255, 0.25);
            border-radius: 4px;
        }

        .zone-desc {
            margin: 7px 0 10px;
            font-size: 10px;
            line-height: 1.55;
            color: #6f8fa5;
        }

        .zone-block .category {
            margin-bottom: 12px;
        }

        .zone-block .category h3 {
            font-size: 10px;
            margin-bottom: 7px;
        }

        /* 卡片规格徽标 */
        .item-spec {
            display: block;
            margin-top: 3px;
            font-family: var(--sci-mono);
            font-size: 8px;
            color: #7fb4cc;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }

        /* 通用器材渲染（未单独建模的器材统一用图标 + 名称卡片表示） */
        .eq-generic {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 2px;
            width: 72px;
            height: 72px;
            border-radius: 12px;
            border: 1px solid rgba(46, 230, 255, 0.3);
            background: rgba(10, 24, 40, 0.72);
            box-shadow:
                0 6px 18px rgba(0, 0, 0, 0.45),
                inset 0 0 16px rgba(46, 230, 255, 0.12);
            backdrop-filter: blur(6px);
        }

        .eq-glyph {
            font-size: 26px;
            line-height: 1;
        }

        .eq-tag {
            font-size: 9px;
            color: #9fe8fa;
            letter-spacing: 0.04em;
            white-space: nowrap;
        }

        /* ============================================================
           扩展器材实物绘制
           与基础器材（烧杯/试管/锥形瓶）保持同一套玻璃与金属材质语言
           ============================================================ */

        /* 蒸发皿 */
        .evap-dish {
            position: relative;
            width: 116px;
            height: 58px;
            border-radius: 0 0 58px 58px / 0 0 48px 48px;
            background: linear-gradient(to right,
                rgba(255, 255, 255, 0.55) 0%,
                rgba(232, 240, 250, 0.95) 22%,
                rgba(250, 252, 255, 1) 50%,
                rgba(232, 240, 250, 0.95) 78%,
                rgba(255, 255, 255, 0.55) 100%);
            border: 2px solid rgba(190, 175, 150, 0.9);
            box-shadow:
                inset -4px -6px 14px rgba(0, 0, 0, 0.16),
                4px 6px 16px rgba(0, 0, 0, 0.35);
        }

        .evap-dish-rim {
            position: absolute;
            top: -6px;
            left: -4px;
            right: -4px;
            height: 14px;
            border-radius: 50%;
            background: linear-gradient(to bottom, #f7f4ee, #cfc4b2);
            box-shadow: 0 2px 6px rgba(0, 0, 0, 0.25);
        }

        .evap-dish-liquid {
            position: absolute;
            bottom: 4px;
            left: 8px;
            right: 8px;
            height: 18px;
            border-radius: 0 0 50px 50px / 0 0 40px 40px;
            background: rgba(120, 190, 240, 0.55);
        }

        /* 坩埚 */
        .crucible {
            position: relative;
            width: 82px;
            height: 76px;
            background: linear-gradient(to right, #e9e6df, #ffffff 42%, #d5d0c6);
            clip-path: polygon(4% 0, 96% 0, 78% 100%, 22% 100%);
            filter: drop-shadow(3px 5px 10px rgba(0, 0, 0, 0.4));
        }

        .crucible::after {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 11px;
            background: linear-gradient(to bottom, rgba(115, 110, 100, 0.5), transparent);
        }

        /* 表面皿 */
        .watch-glass {
            width: 96px;
            height: 28px;
            border-radius: 50%;
            background: radial-gradient(ellipse at 50% 35%,
                rgba(255, 255, 255, 0.88),
                rgba(190, 220, 245, 0.45) 60%,
                rgba(140, 180, 220, 0.35));
            border: 2px solid rgba(160, 195, 230, 0.9);
            box-shadow:
                inset -4px -4px 10px rgba(255, 255, 255, 0.6),
                3px 5px 12px rgba(0, 0, 0, 0.3);
        }

        /* 玻璃棒 */
        .glass-rod {
            width: 14px;
            height: 130px;
            border-radius: 7px;
            background: linear-gradient(to right,
                rgba(255, 255, 255, 0.15),
                rgba(210, 235, 255, 0.75) 45%,
                rgba(160, 200, 235, 0.5) 70%,
                rgba(255, 255, 255, 0.2));
            border: 1.5px solid rgba(150, 185, 220, 0.85);
            box-shadow: 2px 3px 10px rgba(0, 0, 0, 0.3);
            transform: rotate(12deg);
        }

        /* 漏斗 */
        .funnel {
            width: 92px;
        }

        .funnel-cone {
            width: 92px;
            height: 64px;
            background: linear-gradient(to right,
                rgba(255, 255, 255, 0.25),
                rgba(200, 230, 255, 0.6) 50%,
                rgba(255, 255, 255, 0.25));
            border: 2px solid rgba(150, 180, 220, 0.85);
            clip-path: polygon(0 0, 100% 0, 56% 100%, 44% 100%);
            filter: drop-shadow(2px 4px 8px rgba(0, 0, 0, 0.35));
        }

        .funnel-stem {
            width: 12px;
            height: 46px;
            margin: -2px auto 0;
            background: linear-gradient(to right,
                rgba(255, 255, 255, 0.25),
                rgba(200, 230, 255, 0.55),
                rgba(255, 255, 255, 0.25));
            border: 2px solid rgba(150, 180, 220, 0.85);
            border-top: none;
        }

        /* 分液漏斗 */
        .sep-funnel {
            position: relative;
            width: 92px;
            padding-top: 14px;
        }

        .sep-funnel-body {
            width: 92px;
            height: 92px;
            border-radius: 50% 50% 46% 46% / 42% 42% 58% 58%;
            background: linear-gradient(to right,
                rgba(255, 255, 255, 0.2),
                rgba(200, 230, 255, 0.6) 50%,
                rgba(255, 255, 255, 0.2));
            border: 2px solid rgba(150, 180, 220, 0.85);
            box-shadow:
                inset -5px 0 14px rgba(255, 255, 255, 0.5),
                3px 4px 14px rgba(0, 0, 0, 0.3);
        }

        .sep-funnel-stopcock {
            width: 26px;
            height: 12px;
            margin: 0 auto;
            border-radius: 3px;
            background: linear-gradient(to bottom, #d8e6f2, #a9c4da);
            border: 1.5px solid rgba(120, 160, 200, 0.9);
        }

        .sep-funnel-stem {
            width: 10px;
            height: 26px;
            margin: 0 auto;
            background: rgba(200, 230, 255, 0.55);
            border: 1.5px solid rgba(150, 180, 220, 0.85);
            border-top: none;
        }

        .sep-funnel-stopper {
            position: absolute;
            top: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 26px;
            height: 14px;
            border-radius: 5px 5px 2px 2px;
            background: linear-gradient(to bottom, #f0f6fc, #c3d7e8);
            border: 1.5px solid rgba(120, 160, 200, 0.9);
        }

        /* 集气瓶 */
        .gas-jar {
            position: relative;
            width: 86px;
            height: 104px;
        }

        .gas-jar-body {
            width: 100%;
            height: 100%;
            border-radius: 6px 6px 12px 12px;
            background: linear-gradient(to right,
                rgba(255, 255, 255, 0.14),
                rgba(200, 230, 255, 0.42) 50%,
                rgba(255, 255, 255, 0.14));
            border: 2.5px solid rgba(150, 180, 220, 0.8);
            box-shadow:
                inset -5px 0 14px rgba(255, 255, 255, 0.55),
                3px 4px 14px rgba(0, 0, 0, 0.3);
        }

        .gas-jar-plate {
            position: absolute;
            top: -8px;
            left: -5px;
            right: -5px;
            height: 10px;
            border-radius: 3px;
            background: linear-gradient(to bottom, rgba(235, 245, 255, 0.9), rgba(175, 205, 230, 0.8));
            border: 1.5px solid rgba(140, 175, 210, 0.9);
        }

        /* 燃烧匙 */
        .comb-spoon {
            position: relative;
            width: 130px;
            height: 26px;
        }

        .comb-spoon-handle {
            position: absolute;
            left: 0;
            top: 10px;
            width: 96px;
            height: 6px;
            border-radius: 3px;
            background: linear-gradient(to bottom, #b9c6d4, #7d8fa3);
            box-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
        }

        .comb-spoon-head {
            position: absolute;
            right: 0;
            top: 2px;
            width: 34px;
            height: 22px;
            border-radius: 0 0 50% 50% / 0 0 70% 70%;
            background: linear-gradient(to bottom, #d9b96a, #a8863c);
            border: 1.5px solid rgba(120, 95, 40, 0.9);
        }

        /* 试管夹 */
        .tube-clamp {
            position: relative;
            width: 84px;
            height: 116px;
        }

        .tube-clamp-handle {
            position: absolute;
            left: 34px;
            top: 0;
            width: 16px;
            height: 70px;
            border-radius: 7px;
            background: linear-gradient(to right, #c9a06a, #8d6535);
            box-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
        }

        .tube-clamp-jaw {
            position: absolute;
            bottom: 26px;
            width: 16px;
            height: 48px;
            border-radius: 8px;
            background: linear-gradient(to right, #d8b47c, #96703c);
        }

        .tube-clamp-jaw.left {
            left: 17px;
            transform: rotate(14deg);
        }

        .tube-clamp-jaw.right {
            right: 17px;
            transform: rotate(-14deg);
        }

        /* 坩埚钳 */
        .crucible-tongs {
            position: relative;
            width: 132px;
            height: 40px;
        }

        .tong-arm {
            position: absolute;
            left: 0;
            top: 16px;
            width: 120px;
            height: 6px;
            border-radius: 3px;
            background: linear-gradient(to bottom, #cfd8e2, #7f8e9e);
            box-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
        }

        .tong-arm.top {
            transform: rotate(-8deg);
        }

        .tong-arm.bottom {
            transform: rotate(8deg);
        }

        .tong-joint {
            position: absolute;
            left: 6px;
            top: 12px;
            width: 14px;
            height: 14px;
            border-radius: 50%;
            background: #6f7d8c;
            border: 2px solid #4d5a68;
        }

        /* 镊子 */
        .tweezers {
            position: relative;
            width: 116px;
            height: 34px;
        }

        .tweezer-arm {
            position: absolute;
            left: 0;
            width: 110px;
            height: 5px;
            border-radius: 3px;
            background: linear-gradient(to bottom, #dfe8f0, #93a3b3);
        }

        .tweezer-arm.top {
            top: 8px;
            transform: rotate(5deg);
        }

        .tweezer-arm.bottom {
            top: 20px;
            transform: rotate(-5deg);
        }

        /* 研钵 */
        .mortar {
            position: relative;
            width: 100px;
            height: 78px;
        }

        .mortar-bowl {
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100px;
            height: 54px;
            border-radius: 50% 50% 14px 14px / 70% 70% 30% 30%;
            background: linear-gradient(to right, #e7e3da, #ffffff 45%, #cdc8bd);
            border: 2px solid rgba(150, 145, 135, 0.9);
            box-shadow:
                inset -6px 0 14px rgba(0, 0, 0, 0.15),
                3px 5px 12px rgba(0, 0, 0, 0.3);
        }

        .mortar-pestle {
            position: absolute;
            right: 2px;
            top: 0;
            width: 16px;
            height: 56px;
            border-radius: 8px;
            background: linear-gradient(to right, #d6ccbd, #a08b6d);
            box-shadow: 2px 3px 8px rgba(0, 0, 0, 0.35);
            transform: rotate(22deg);
        }

        /* 托盘天平 */
        .balance {
            position: relative;
            width: 142px;
            height: 112px;
        }

        .balance-base {
            position: absolute;
            bottom: 0;
            left: 8px;
            width: 126px;
            height: 16px;
            border-radius: 6px;
            background: linear-gradient(to bottom, #8e9aa8, #4f5a66);
            box-shadow: 0 4px 10px rgba(0, 0, 0, 0.4);
        }

        .balance-pillar {
            position: absolute;
            bottom: 16px;
            left: 50%;
            transform: translateX(-50%);
            width: 10px;
            height: 52px;
            background: linear-gradient(to right, #b9c4d0, #6c7a88);
        }

        .balance-beam {
            position: absolute;
            top: 26px;
            left: 6px;
            width: 130px;
            height: 6px;
            border-radius: 3px;
            background: linear-gradient(to bottom, #d5dee8, #8b98a6);
        }

        .balance-pan {
            position: absolute;
            top: 32px;
            width: 46px;
            height: 11px;
            border-radius: 50%;
            background: linear-gradient(to bottom, #e6edf4, #a6b4c2);
            border: 1px solid rgba(110, 125, 140, 0.8);
        }

        .balance-pan.left {
            left: 0;
        }

        .balance-pan.right {
            right: 0;
        }

        /* 洗瓶 */
        .wash-bottle {
            position: relative;
            width: 78px;
            height: 128px;
        }

        .wash-bottle-body {
            position: absolute;
            bottom: 0;
            left: 4px;
            width: 70px;
            height: 96px;
            border-radius: 10px 10px 16px 16px;
            background: linear-gradient(to right,
                rgba(255, 255, 255, 0.35),
                rgba(210, 240, 255, 0.6) 50%,
                rgba(255, 255, 255, 0.35));
            border: 2px solid rgba(150, 185, 220, 0.85);
            box-shadow:
                inset -4px 0 12px rgba(255, 255, 255, 0.6),
                3px 4px 12px rgba(0, 0, 0, 0.3);
        }

        .wash-bottle-liquid {
            position: absolute;
            bottom: 3px;
            left: 6px;
            right: 6px;
            height: 44px;
            border-radius: 0 0 14px 14px;
            background: rgba(120, 200, 240, 0.45);
        }

        .wash-bottle-cap {
            position: absolute;
            top: 16px;
            left: 50%;
            transform: translateX(-50%);
            width: 28px;
            height: 16px;
            border-radius: 5px;
            background: linear-gradient(to bottom, #6fd6ff, #2f9fd0);
        }

        .wash-bottle-tube {
            position: absolute;
            top: 0;
            left: 40px;
            width: 8px;
            height: 44px;
            border-radius: 4px;
            background: linear-gradient(to right, rgba(220, 245, 255, 0.9), rgba(150, 205, 235, 0.8));
            border: 1px solid rgba(140, 185, 220, 0.8);
            transform: rotate(-14deg);
            transform-origin: bottom center;
        }

        /* 试管刷 */
        .tube-brush {
            position: relative;
            width: 44px;
            height: 136px;
        }

        .tube-brush-handle {
            position: absolute;
            top: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 10px;
            height: 74px;
            border-radius: 5px;
            background: linear-gradient(to right, #d6c19a, #9a8055);
        }

        .tube-brush-bristles {
            position: absolute;
            top: 70px;
            left: 50%;
            transform: translateX(-50%);
            width: 38px;
            height: 58px;
            border-radius: 8px 8px 18px 18px;
            background: repeating-linear-gradient(90deg,
                rgba(230, 235, 240, 0.95) 0 3px,
                rgba(160, 175, 190, 0.85) 3px 6px);
            border: 1px solid rgba(140, 155, 170, 0.8);
        }

        /* 晾干架 */
        .drying-rack {
            position: relative;
            width: 140px;
            height: 112px;
        }

        .drying-rack-base {
            position: absolute;
            bottom: 0;
            left: 6px;
            width: 128px;
            height: 10px;
            border-radius: 4px;
            background: linear-gradient(to bottom, #cfd9e3, #7d8b99);
        }

        .drying-rack-pillar {
            position: absolute;
            bottom: 10px;
            left: 50%;
            transform: translateX(-50%);
            width: 8px;
            height: 92px;
            background: linear-gradient(to right, #d8e2ec, #8b98a6);
        }

        .drying-rack-bar {
            position: absolute;
            left: 18px;
            width: 104px;
            height: 5px;
            border-radius: 3px;
            background: linear-gradient(to bottom, #dbe5ef, #93a1af);
        }

        .drying-rack-bar.b1 { top: 24px; }
        .drying-rack-bar.b2 { top: 52px; }
        .drying-rack-bar.b3 { top: 80px; }

        /* 抹布 */
        .cloth-wrap {
            position: relative;
            width: 96px;
            height: 66px;
        }

        .cloth-fold {
            position: absolute;
            inset: 0;
            border-radius: 6px;
            background:
                repeating-linear-gradient(45deg,
                    rgba(255, 255, 255, 0.12) 0 6px,
                    rgba(255, 255, 255, 0) 6px 12px),
                linear-gradient(to bottom right, #6fa8c9, #3f7592);
            border: 1px solid rgba(40, 80, 105, 0.7);
            box-shadow: 3px 4px 10px rgba(0, 0, 0, 0.35);
            transform: rotate(-6deg);
        }

        .cloth-fold::after {
            content: "";
            position: absolute;
            left: 8%;
            right: 8%;
            top: 46%;
            height: 2px;
            background: rgba(255, 255, 255, 0.28);
            box-shadow: 0 8px 0 rgba(255, 255, 255, 0.18);
        }

        /* 废液缸 / 废固桶（共用桶体，靠配色区分） */
        .waste-bin {
            position: relative;
            width: 92px;
            height: 112px;
        }

        .waste-bin-body {
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 98px;
            overflow: hidden;
            border-radius: 8px 8px 14px 14px;
            background: linear-gradient(to right,
                rgba(255, 255, 255, 0.18),
                rgba(200, 230, 255, 0.5) 50%,
                rgba(255, 255, 255, 0.18));
            border: 2.5px solid rgba(120, 170, 210, 0.85);
            box-shadow:
                inset -5px 0 14px rgba(255, 255, 255, 0.5),
                3px 5px 14px rgba(0, 0, 0, 0.35);
        }

        .waste-bin-liquid {
            position: absolute;
            bottom: 2px;
            left: 2px;
            right: 2px;
            height: 46px;
            background: rgba(150, 205, 120, 0.55);
        }

        .waste-bin-label {
            position: absolute;
            bottom: 36px;
            left: 50%;
            transform: translateX(-50%);
            padding: 2px 6px;
            border-radius: 3px;
            font-size: 9px;
            font-weight: 600;
            white-space: nowrap;
            color: #2f6b3f;
            background: rgba(255, 255, 255, 0.9);
        }

        .waste-bin.solid .waste-bin-body {
            background: linear-gradient(to right,
                rgba(255, 255, 255, 0.16),
                rgba(190, 200, 210, 0.5) 50%,
                rgba(255, 255, 255, 0.16));
            border-color: rgba(120, 135, 150, 0.85);
        }

        .waste-bin.solid .waste-bin-label {
            color: #4a5560;
        }

        .waste-bin-lid {
            position: absolute;
            top: 0;
            left: -4px;
            right: -4px;
            height: 14px;
            border-radius: 5px;
            background: linear-gradient(to bottom, #cfe0ee, #8fa8bd);
            border: 2px solid rgba(110, 145, 175, 0.9);
        }

        .waste-bin.solid .waste-bin-lid {
            background: linear-gradient(to bottom, #d3d9df, #919ba5);
            border-color: rgba(105, 118, 132, 0.9);
        }

        /* 锐器盒 */
        .sharps-box {
            position: relative;
            width: 92px;
            height: 86px;
            border-radius: 8px;
            background: linear-gradient(to bottom, #ffd166, #e6a828);
            border: 2px solid rgba(150, 105, 10, 0.85);
            box-shadow: 3px 5px 14px rgba(0, 0, 0, 0.35);
        }

        .sharps-box::before {
            content: "⚠";
            position: absolute;
            inset: 0;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 34px;
            color: rgba(90, 60, 0, 0.72);
        }

        .sharps-box-lid {
            position: absolute;
            top: -11px;
            left: -4px;
            right: -4px;
            height: 16px;
            border-radius: 5px;
            background: linear-gradient(to bottom, #ffe08a, #d9a115);
            border: 2px solid rgba(150, 105, 10, 0.85);
        }

        /* 仪器分析区：固定安装设备 */
        .item.static {
            cursor: not-allowed;
            border-style: dashed;
            border-color: rgba(167, 139, 250, 0.3);
            background: linear-gradient(160deg, rgba(38, 30, 66, 0.9), rgba(16, 14, 32, 0.9));
            draggable: false;
        }

        .item.static:hover {
            border-color: rgba(167, 139, 250, 0.7);
            box-shadow: 0 0 18px rgba(167, 139, 250, 0.3);
        }

        .item.static .item-name {
            color: #c4b5fd;
        }

        .item.static::after {
            content: "固定";
            position: absolute;
            top: 3px;
            right: 4px;
            padding: 0 3px;
            font-size: 8px;
            color: rgba(167, 139, 250, 0.8);
            border: 1px solid rgba(167, 139, 250, 0.35);
            border-radius: 3px;
            background: rgba(30, 24, 52, 0.8);
        }

        /* ---------- 实验室大面板（规范体系 / 配置清单） ---------- */
        .lab-modal {
            position: fixed;
            inset: 0;
            z-index: 10050;
            display: none;
            align-items: center;
            justify-content: center;
            padding: 24px;
            background: rgba(3, 9, 16, 0.85);
            backdrop-filter: blur(8px);
        }

        .lab-modal.show {
            display: flex;
        }

        .lab-modal-card {
            width: min(1000px, 96vw);
            max-height: 88vh;
            display: flex;
            flex-direction: column;
            overflow: hidden;
            border-radius: 14px;
            border: 1px solid rgba(46, 230, 255, 0.3);
            background: linear-gradient(180deg, rgba(10, 24, 40, 0.98), rgba(5, 12, 22, 0.99));
            box-shadow:
                0 30px 80px rgba(0, 0, 0, 0.75),
                0 0 60px rgba(46, 230, 255, 0.1);
        }

        .lab-modal-head {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 15px 20px;
            border-bottom: 1px solid rgba(46, 230, 255, 0.16);
        }

        .lab-modal-head h2 {
            font-family: var(--sci-mono);
            font-size: 14px;
            letter-spacing: 0.12em;
            color: var(--sci-cyan);
            text-shadow: 0 0 18px rgba(46, 230, 255, 0.45);
        }

        .lab-modal-close {
            margin-left: auto;
            width: 28px;
            height: 28px;
            border-radius: 6px;
            border: 1px solid rgba(46, 230, 255, 0.3);
            background: rgba(46, 230, 255, 0.08);
            color: #9fe8fa;
            cursor: pointer;
            font-size: 13px;
            line-height: 1;
        }

        .lab-modal-close:hover {
            background: rgba(255, 92, 108, 0.2);
            border-color: rgba(255, 92, 108, 0.7);
            color: #ffd7db;
        }

        .lab-modal-body {
            padding: 16px 20px 20px;
            overflow-y: auto;
        }

        /* 规范体系标签页 */
        .rule-tabs {
            display: flex;
            flex-wrap: wrap;
            gap: 6px;
            margin-bottom: 16px;
        }

        .rule-tab {
            padding: 6px 12px;
            font-family: var(--sci-mono);
            font-size: 11px;
            letter-spacing: 0.05em;
            color: #8fb8cc;
            background: rgba(46, 230, 255, 0.05);
            border: 1px solid rgba(46, 230, 255, 0.2);
            border-radius: 6px;
            cursor: pointer;
            transition: all 0.2s;
        }

        .rule-tab:hover {
            color: #d6f6ff;
            border-color: rgba(46, 230, 255, 0.55);
        }

        .rule-tab.active {
            font-weight: 700;
            color: #04121d;
            background: linear-gradient(135deg, #2ee6ff, #4fd1c5);
            border-color: transparent;
        }

        .rule-pane {
            display: none;
        }

        .rule-pane.active {
            display: block;
        }

        .rule-section {
            margin-bottom: 14px;
            padding: 12px 14px;
            border-left: 2px solid rgba(46, 230, 255, 0.45);
            background: rgba(46, 230, 255, 0.035);
            border-radius: 0 8px 8px 0;
        }

        .rule-section h4 {
            margin-bottom: 8px;
            font-size: 12px;
            color: #9fe8fa;
            letter-spacing: 0.06em;
        }

        .rule-list {
            list-style: none;
            display: grid;
            gap: 6px;
        }

        .rule-list li {
            display: flex;
            gap: 8px;
            font-size: 12px;
            line-height: 1.65;
            color: #bdd7e6;
        }

        .rule-list li::before {
            content: "▸";
            flex: none;
            color: rgba(46, 230, 255, 0.6);
        }

        .rule-list li b {
            font-weight: 600;
            color: #ffe1a3;
        }

        /* 配置清单 */
        .cfg-toolbar {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 8px;
            margin-bottom: 12px;
        }

        .cfg-stat {
            padding: 4px 9px;
            font-family: var(--sci-mono);
            font-size: 10px;
            color: #7fb4cc;
            border: 1px solid rgba(46, 230, 255, 0.2);
            border-radius: 5px;
        }

        .cfg-table {
            width: 100%;
            border-collapse: collapse;
            font-size: 11px;
        }

        .cfg-table th {
            position: sticky;
            top: 0;
            padding: 8px 10px;
            text-align: left;
            white-space: nowrap;
            font-family: var(--sci-mono);
            font-size: 10px;
            letter-spacing: 0.08em;
            color: #9fe8fa;
            background: rgba(9, 22, 38, 0.98);
            border-bottom: 1px solid rgba(46, 230, 255, 0.28);
        }

        .cfg-table td {
            padding: 7px 10px;
            vertical-align: top;
            color: #bdd7e6;
            border-bottom: 1px solid rgba(46, 230, 255, 0.08);
        }

        .cfg-table tr:hover td {
            background: rgba(46, 230, 255, 0.05);
        }

        .cfg-zone {
            white-space: nowrap;
            font-weight: 600;
            color: #c4b5fd;
        }

        .cfg-usage {
            color: #8fb8cc;
        }

        /* 移动端：收敛圆角与光晕强度，避免小屏过载 */
        @media (max-width: 768px) {
            .sidebar,
            .workbench {
                border-radius: 12px;
            }

            .btn {
                font-size: 11px;
            }
        }