.physics-params-panel{height:100%;display:flex;flex-direction:column;background:linear-gradient(135deg,#fff,#fffef8);padding:16px;overflow-y:auto}.params-empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;height:100%;color:#666}.empty-icon{font-size:48px;margin-bottom:12px;opacity:.5}.empty-text{font-size:16px;font-weight:500;margin-bottom:8px;color:#444}.empty-hint{font-size:12px;color:#999;text-align:center;line-height:1.5}.params-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:2px;padding-bottom:8px;border-bottom:1px solid #000000}.params-title{font-size:13px;font-weight:500;color:#666;line-height:1.5;flex:1}.params-status-badge{display:flex;align-items:center;gap:6px;padding:4px 10px;background:linear-gradient(135deg,#fef3c7,#fde68a);border:1px solid #f59e0b;border-radius:12px;font-size:11px;color:#92400e;font-weight:500}.status-dot{width:6px;height:6px;background:#f59e0b;border-radius:50%;animation:pulse 2s ease-in-out infinite}@keyframes pulse{0%,to{opacity:1}50%{opacity:.4}}.object-selector{margin-top:8px;margin-bottom:8px}.selector-label{display:block;font-size:12px;color:#666;margin-bottom:8px;font-weight:500}.object-tabs{display:flex;flex-wrap:wrap;gap:6px}.object-tab{padding:6px 12px;border:1px solid #000000;border-radius:10px;background:linear-gradient(135deg,#fff,#fffef8);color:#222;font-size:12px;font-weight:500;cursor:pointer;transition:all .2s;display:flex;align-items:center;gap:6px}.object-tab:hover{background:linear-gradient(135deg,#fff8e1,#ffeaa7);box-shadow:0 2px 6px #ff980026;transform:translateY(-1px)}.object-tab.active{background:linear-gradient(135deg,#ffeaa7,#ffcc80);border-color:#ff9800;box-shadow:0 3px 8px #ff980040}.type-badge{padding:2px 6px;background:#fff9;border-radius:6px;font-size:10px;color:#666;white-space:nowrap}.params-content{flex:1;overflow-y:auto}.param-section{margin-bottom:20px;padding:12px;background:#ffffff80;border:1px solid #ffd93d;border-radius:12px}.section-title{font-size:13px;font-weight:600;color:#444;margin-bottom:12px;padding-bottom:6px;border-bottom:1px solid #ffe680}.param-item{margin-bottom:16px}.param-item:last-child{margin-bottom:0}.param-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px}.param-label{font-size:12px;font-weight:500;color:#444}.param-value-input{width:70px;padding:4px 8px;border:1px solid #000000;border-radius:6px;background:#fff;color:#222;font-size:12px;font-weight:500;text-align:right;transition:all .2s}.param-value-input:focus{outline:none;border-color:#ff9800;box-shadow:0 0 0 2px #ff98001a}.param-slider{width:100%;height:6px;border-radius:3px;background:linear-gradient(90deg,#fff8e1,#ffeaa7);outline:none;-webkit-appearance:none;-moz-appearance:none;appearance:none;margin-bottom:6px}.param-slider::-webkit-slider-thumb{-webkit-appearance:none;-moz-appearance:none;appearance:none;width:16px;height:16px;border-radius:50%;background:linear-gradient(135deg,#fff,#ffeaa7);border:2px solid #000000;cursor:pointer;transition:all .2s;box-shadow:0 2px 4px #0000001a}.param-slider::-webkit-slider-thumb:hover{background:linear-gradient(135deg,#ffeaa7,#ffcc80);box-shadow:0 3px 8px #ff98004d;transform:scale(1.1)}.param-slider::-moz-range-thumb{width:16px;height:16px;border-radius:50%;background:linear-gradient(135deg,#fff,#ffeaa7);border:2px solid #000000;cursor:pointer;transition:all .2s;box-shadow:0 2px 4px #0000001a}.param-slider::-moz-range-thumb:hover{background:linear-gradient(135deg,#ffeaa7,#ffcc80);box-shadow:0 3px 8px #ff98004d;transform:scale(1.1)}.param-hint{font-size:11px;color:#999;line-height:1.4}.params-footer{margin-top:16px;padding-top:12px;border-top:1px solid #ffd93d}.footer-hint{font-size:11px;color:#666;line-height:1.6;padding:10px 12px;background:linear-gradient(135deg,#fffef8,#fff8e1);border:1px solid #ffe680;border-radius:8px;word-wrap:break-word;word-break:keep-all;overflow-wrap:break-word}.physics-params-panel::-webkit-scrollbar,.params-content::-webkit-scrollbar{width:6px}.physics-params-panel::-webkit-scrollbar-track,.params-content::-webkit-scrollbar-track{background:#fff9db4d;border-radius:3px}.physics-params-panel::-webkit-scrollbar-thumb,.params-content::-webkit-scrollbar-thumb{background:#ff98004d;border-radius:3px}.physics-params-panel::-webkit-scrollbar-thumb:hover,.params-content::-webkit-scrollbar-thumb:hover{background:#ff980080}.auth-modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background-color:#00000080;z-index:1000;animation:fadeIn .2s ease-out}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}.auth-modal-content{position:fixed;top:50%;left:50%;transform:translate(-50%,-50%);background:linear-gradient(135deg,#fff,#fff8e1);border-radius:16px;padding:32px;width:90%;max-width:420px;box-shadow:0 8px 32px #ff980040;border:1px solid #ffd93d;z-index:1001;animation:slideIn .3s ease-out}.auth-modal-close{position:absolute;top:16px;right:16px;background:none;border:none;font-size:24px;cursor:pointer;color:#ff9800;padding:4px 8px;line-height:1;transition:color .2s}.auth-modal-close:hover{color:#ff6b35}.auth-error{background:#fef2f2;border:1px solid #fecaca;color:#dc2626;padding:12px;border-radius:8px;margin-bottom:16px;font-size:14px;animation:shake .3s}@keyframes shake{0%,to{transform:translate(0)}25%{transform:translate(-5px)}75%{transform:translate(5px)}}.auth-title{text-align:center;font-size:24px;margin-bottom:8px;margin-top:8px;color:#222;font-weight:600}.auth-description{text-align:center;font-size:14px;color:#6b7280;margin-bottom:24px}.auth-form{display:flex;flex-direction:column;gap:16px}.auth-form label{font-size:14px;font-weight:500;color:#374151;margin-bottom:-8px}.auth-form input{padding:12px 16px;border:1px solid #ffd93d;border-radius:8px;font-size:14px;transition:all .2s;outline:none;background:#fff}.auth-form input:focus{border-color:#ff9800;box-shadow:0 0 0 3px #ff980026}.auth-form input::placeholder{color:#9ca3af}.password-input{position:relative;display:flex;align-items:center}.password-input input{flex:1;padding-right:48px}.toggle-password{position:absolute;right:12px;top:50%;transform:translateY(-50%);background:none;border:none;cursor:pointer;padding:4px;line-height:1;color:#9ca3af;transition:color .2s;display:flex;align-items:center;justify-content:center}.toggle-password:hover{color:#6b7280}.verification-code-input{position:relative;display:flex;align-items:center;gap:8px}.verification-code-input input{flex:1;padding:12px 16px;border:1px solid #ffd93d;border-radius:8px;font-size:14px;transition:all .2s;outline:none;background:#fff}.verification-code-input input:focus{border-color:#ff9800;box-shadow:0 0 0 3px #ff980026}.verification-code-input input::placeholder{color:#9ca3af}.send-code-btn{background:linear-gradient(135deg,#fff,#fffef8);color:#222;border:1px solid #000000;padding:12px 16px;border-radius:8px;font-size:13px;font-weight:500;cursor:pointer;transition:all .2s;white-space:nowrap;min-width:100px;flex-shrink:0}.send-code-btn:hover:not(:disabled){background:linear-gradient(135deg,#fff8e1,#ffeaa7);border-color:#ff9800;box-shadow:0 2px 8px #ff980033;transform:translateY(-1px)}.send-code-btn:active:not(:disabled){transform:scale(.98)}.send-code-btn:disabled{background:#f3f4f6;color:#9ca3af;border-color:#e5e7eb;cursor:not-allowed;transform:none}.auth-submit-btn{background:linear-gradient(135deg,#fff,#fffef8);color:#222;border:1px solid #000000;padding:14px;border-radius:12px;font-size:16px;font-weight:600;cursor:pointer;transition:all .2s;margin-top:8px}.auth-submit-btn:hover:not(:disabled){background:linear-gradient(135deg,#fff8e1,#ffeaa7);border-color:#000;box-shadow:0 4px 12px #ff980033;transform:translateY(-1px)}.auth-submit-btn:active:not(:disabled){transform:scale(.98)}.auth-submit-btn:disabled{background:#f3f4f6;color:#9ca3af;border-color:#e5e7eb;cursor:not-allowed}.auth-hint{text-align:center;font-size:13px;color:#6b7280;margin-top:8px}.auth-link-btn{background:none;border:none;color:#ff9800;cursor:pointer;font-weight:500;padding:0;margin-left:4px;text-decoration:underline;transition:color .2s}.auth-link-btn:hover{color:#ff6b35}.user-menu{position:relative}.user-menu-trigger{background:linear-gradient(135deg,#fff,#fffef8);border:1px solid #000000;padding:8px 16px;border-radius:8px;font-size:14px;cursor:pointer;transition:all .2s;display:flex;align-items:center;gap:6px;color:#222;font-weight:500}.user-menu-trigger:hover{border-color:#ff9800;background:linear-gradient(135deg,#fff8e1,#ffeaa7)}.user-menu-trigger:active{transform:scale(.98)}.user-menu-dropdown{position:absolute;top:calc(100% + 8px);right:0;background:linear-gradient(135deg,#fff,#fff8e1);border:1px solid #ffd93d;border-radius:8px;box-shadow:0 4px 12px #ff980033;min-width:160px;z-index:100;animation:dropdownSlideIn .2s ease-out}@keyframes dropdownSlideIn{0%{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:translateY(0)}}.user-menu-item{padding:12px 16px;font-size:14px;cursor:pointer;transition:all .2s;display:flex;align-items:center;gap:8px;color:#222}.user-menu-item svg{color:#ff9800;transition:transform .2s}.user-menu-item:first-child{border-radius:8px 8px 0 0}.user-menu-item:last-child{border-radius:0 0 8px 8px}.user-menu-item:hover{background:#ff98001a}.user-menu-item:hover svg{transform:translate(2px)}.user-menu-divider{height:1px;background:#e5e7eb;margin:4px 0}.login-btn{background:linear-gradient(135deg,#fff,#fffef8);color:#222;border:1px solid #000000;padding:8px 20px;border-radius:12px;font-size:14px;font-weight:500;cursor:pointer;transition:all .2s}.login-btn:hover{background:linear-gradient(135deg,#fff8e1,#ffeaa7);border-color:#000;box-shadow:0 4px 12px #ff980033;transform:translateY(-1px)}.login-btn:active{transform:scale(.98)}@media (max-width: 640px){.auth-modal-content{width:95%;padding:24px}.auth-title{font-size:20px}}.join-us-modal-content{position:fixed;top:50%;left:50%;transform:translate(-50%,-50%);background:linear-gradient(135deg,#fff,#fff8e1);border-radius:16px;padding:48px 32px 32px;width:90%;max-width:600px;max-height:85vh;overflow-y:auto;box-shadow:0 8px 32px #ff980040;border:1px solid #ffd93d;z-index:1001;animation:slideIn .3s ease-out}@keyframes slideIn{0%{opacity:0;transform:translate(-50%,-48%)}to{opacity:1;transform:translate(-50%,-50%)}}.join-us-title{text-align:center;font-size:28px;margin-bottom:24px;margin-top:8px;color:#222;font-weight:600}.join-us-content{margin-bottom:32px;padding:24px;background:#ffffff80;border-radius:12px;line-height:1.8}.join-us-content p{color:#374151;font-size:15px;margin-bottom:16px}.join-us-content p:last-child{margin-bottom:0}.email-link{color:#ff9800;font-weight:600;text-decoration:none;margin-left:4px;transition:color .2s}.email-link:hover{color:#ff6b35;text-decoration:underline}.recruitment-section{margin-bottom:32px}.recruitment-intro{color:#374151;font-size:15px;margin-bottom:16px;font-weight:500}.section-title{font-size:20px;font-weight:600;color:#222;margin-bottom:16px;text-align:center}.contact-section{margin-bottom:24px;padding:20px;background:#ffffff80;border-radius:12px;text-align:center}.contact-section p{color:#374151;font-size:14px;line-height:1.6;margin-bottom:12px}.contact-section p:last-child{margin-bottom:0}.template-download{margin-top:20px;display:flex;justify-content:center}.download-button{display:inline-flex;align-items:center;gap:8px;padding:12px 24px;background:linear-gradient(135deg,#ff9800,#ff6b35);color:#fff;text-decoration:none;border-radius:8px;font-size:14px;font-weight:500;transition:all .3s ease;box-shadow:0 2px 8px #ff98004d}.download-button:hover{transform:translateY(-2px);box-shadow:0 4px 12px #ff980066;background:linear-gradient(135deg,#ff6b35,#ff9800)}.download-button:active{transform:translateY(0)}.position-card{background:#ffffff80;border-radius:12px;padding:20px;margin-bottom:16px}.position-card:last-child{margin-bottom:0}.position-header{display:flex;align-items:center;gap:12px;margin-bottom:12px}.position-icon{font-size:24px}.position-title{font-size:18px;font-weight:600;color:#222;margin:0}.requirements-list{list-style:none;padding:0;margin:0}.requirements-list li{padding:8px 0 8px 24px;color:#4b5563;font-size:14px;position:relative}.requirements-list li:before{content:"✓";position:absolute;left:0;color:#ff9800;font-weight:700}.qrcode-section{margin-top:0}.qrcode-container{display:flex;justify-content:center;gap:32px;flex-wrap:wrap;margin-top:20px}.qrcode-item{display:flex;flex-direction:column;align-items:center;gap:12px}.qrcode-placeholder{width:140px;height:140px;display:flex;align-items:center;justify-content:center}.qrcode-box{background:#fff;border:2px dashed #e5e7eb;border-radius:12px;padding:10px;transition:all .2s}.qrcode-box:hover{border-color:#ffd93d;box-shadow:0 2px 8px #ff98001a}.qrcode-label{font-size:14px;color:#6b7280;font-weight:500}.join-us-modal-content::-webkit-scrollbar{width:8px}.join-us-modal-content::-webkit-scrollbar-track{background:#ffffff4d;border-radius:4px}.join-us-modal-content::-webkit-scrollbar-thumb{background:#ff98004d;border-radius:4px}.join-us-modal-content::-webkit-scrollbar-thumb:hover{background:#ff980080}@media (max-width: 640px){.join-us-modal-content{width:95%;padding:24px 20px;max-height:90vh}.join-us-title{font-size:24px}.section-title{font-size:18px}.position-title{font-size:16px}.qrcode-container{gap:24px}.qrcode-placeholder{width:120px;height:120px}.qrcode-box svg{width:100px;height:100px}}.modal-close-fixed{position:fixed;top:16px;right:16px;background:#ffffffe6;border:1px solid #ffd93d;border-radius:50%;width:32px;height:32px;display:flex;align-items:center;justify-content:center;font-size:20px;cursor:pointer;color:#ff9800;transition:all .2s;z-index:1002;box-shadow:0 2px 8px #0000001a}.modal-close-fixed:hover{background:#fff;color:#ff6b35;transform:rotate(90deg);box-shadow:0 4px 12px #ff98004d}.modal-close-fixed:active{transform:rotate(90deg) scale(.95)}@media (max-width: 640px){.modal-close-fixed{width:28px;height:28px;font-size:18px;top:12px;right:12px}}.tutorial-modal-content{max-width:600px}.video-section{margin:24px 0}.video-container{width:100%;background:#000;border-radius:12px;overflow:hidden;box-shadow:0 4px 16px #0003}.tutorial-video{width:100%;height:auto;display:block;aspect-ratio:16 / 9;object-fit:contain}.feature-description{margin-bottom:16px;padding:16px;background:#fff8e180;border-radius:8px;border-left:4px solid #ff9800}.feature-description p{color:#374151;font-size:14px;line-height:1.6;margin:0}@media (max-width: 640px){.tutorial-modal-content{max-width:95%}.tutorial-video{aspect-ratio:16 / 9}}.feedback-reward{color:#ff9800;font-weight:600;font-size:15px;margin-top:12px}.feedback-reward strong{color:#ff6b35;font-size:16px}.feedback-form{margin-top:24px}.form-group{margin-bottom:24px}.form-label{display:block;font-size:14px;font-weight:600;color:#374151;margin-bottom:8px}.form-hint{font-size:12px;color:#6b7280;margin-bottom:12px}.feedback-input{width:100%;padding:12px 16px;border:1px solid #ffd93d;border-radius:8px;font-size:14px;font-family:inherit;transition:all .2s;outline:none;background:#fff;box-sizing:border-box}.feedback-input:focus{border-color:#ff9800;box-shadow:0 0 0 3px #ff980026}.feedback-input::placeholder{color:#9ca3af}.feedback-textarea{width:100%;padding:12px 16px;border:1px solid #ffd93d;border-radius:8px;font-size:14px;font-family:inherit;resize:vertical;min-height:120px;transition:all .2s;outline:none;background:#fff;line-height:1.6;box-sizing:border-box}.feedback-textarea:focus{border-color:#ff9800;box-shadow:0 0 0 3px #ff980026}.feedback-textarea::placeholder{color:#9ca3af;line-height:1.6}.image-upload-area{display:flex;flex-wrap:wrap;gap:12px}.image-preview-item{position:relative;width:100px;height:100px;border-radius:8px;overflow:hidden;border:2px solid #ffd93d;background:#f3f4f6}.image-preview-item img{width:100%;height:100%;object-fit:cover}.remove-image-btn{position:absolute;top:4px;right:4px;width:24px;height:24px;border-radius:50%;background:#0009;color:#fff;border:none;cursor:pointer;display:flex;align-items:center;justify-content:center;font-size:14px;transition:all .2s}.remove-image-btn:hover{background:#ff6b35e6;transform:scale(1.1)}.upload-box{width:100px;height:100px;border:2px dashed #ffd93d;border-radius:8px;display:flex;flex-direction:column;align-items:center;justify-content:center;cursor:pointer;transition:all .2s;background:#ffffff80}.upload-box:hover{border-color:#ff9800;background:#fff8e1cc;transform:scale(1.02)}.upload-icon{font-size:32px;margin-bottom:4px}.upload-text{font-size:12px;color:#6b7280;font-weight:500}@media (max-width: 640px){.image-preview-item,.upload-box{width:80px;height:80px}.upload-icon{font-size:28px}.upload-text{font-size:11px}.feedback-textarea{min-height:100px}}:root{--bg: linear-gradient(135deg, #fffbf0 0%, #fff8e1 50%, #ffeaa7 100%);--bg-solid: #fffbf0;--border: #ffcc80;--border-light: #ffd93d;--primary: #222;--primary-light: #ff9800;--primary-dark: #e67e22;--card-bg: linear-gradient(135deg, #ffffff 0%, #fffef8 100%);--card-bg-solid: #ffffff;--text-primary: #222;--text-secondary: #444;--text-muted: #666}body{margin:0;background:var(--bg);background-attachment:fixed;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,Noto Sans,"Apple Color Emoji","Segoe UI Emoji";position:relative;overflow:hidden;height:100vh}body:before{content:"";position:fixed;top:0;left:0;width:100%;height:100%;pointer-events:none;z-index:0;opacity:.32;background-image:url('data:image/svg+xml,%3Csvg xmlns="http://www.w3.org/2000/svg" width="800" height="600" viewBox="0 0 800 600"%3E%3Cg stroke="%23ff9800" stroke-width="2" fill="none" stroke-linecap="round" stroke-linejoin="round"%3E%3C!-- 单摆 --%3E%3Ccircle cx="50" cy="30" r="3" stroke-width="2"/%3E%3Cline x1="50" y1="30" x2="50" y2="80" stroke-width="1.5"/%3E%3Ccircle cx="50" cy="85" r="8" stroke-width="2"/%3E%3Ccircle cx="720" cy="50" r="3" stroke-width="2"/%3E%3Cline x1="720" y1="50" x2="720" y2="110" stroke-width="1.5"/%3E%3Ccircle cx="720" cy="115" r="8" stroke-width="2"/%3E%3Ccircle cx="150" cy="520" r="3" stroke-width="2"/%3E%3Cline x1="150" y1="520" x2="150" y2="570" stroke-width="1.5"/%3E%3Ccircle cx="150" cy="575" r="8" stroke-width="2"/%3E%3C!-- 滑轮系统 --%3E%3Ccircle cx="650" cy="450" r="15" stroke-width="2"/%3E%3Ccircle cx="650" cy="450" r="10" stroke-width="1.5"/%3E%3Cline x1="635" y1="450" x2="635" y2="500" stroke-width="1.5"/%3E%3Crect x="628" y="500" width="14" height="12" stroke-width="2"/%3E%3Ccircle cx="400" cy="30" r="15" stroke-width="2"/%3E%3Ccircle cx="400" cy="30" r="10" stroke-width="1.5"/%3E%3Cline x1="385" y1="30" x2="385" y2="70" stroke-width="1.5"/%3E%3Crect x="378" y="70" width="14" height="12" stroke-width="2"/%3E%3C!-- 地面上的滑块 --%3E%3Cline x1="180" y1="100" x2="280" y2="100" stroke-width="2.5"/%3E%3Crect x="195" y="80" width="22" height="20" stroke-width="2"/%3E%3Crect x="235" y="80" width="22" height="20" stroke-width="2"/%3E%3Cline x1="177" y1="102" x2="183" y2="102" stroke-width="1.5"/%3E%3Cline x1="177" y1="104" x2="183" y2="104" stroke-width="1.5"/%3E%3Cline x1="500" y1="120" x2="600" y2="120" stroke-width="2.5"/%3E%3Crect x="515" y="100" width="22" height="20" stroke-width="2"/%3E%3Crect x="555" y="100" width="22" height="20" stroke-width="2"/%3E%3Cline x1="497" y1="122" x2="503" y2="122" stroke-width="1.5"/%3E%3Cline x1="180" y1="420" x2="280" y2="420" stroke-width="2.5"/%3E%3Crect x="195" y="400" width="22" height="20" stroke-width="2"/%3E%3Crect x="235" y="400" width="22" height="20" stroke-width="2"/%3E%3Cline x1="177" y1="422" x2="183" y2="422" stroke-width="1.5"/%3E%3C!-- 斜面+滑块 --%3E%3Cpath d="M300 180L400 180L300 120Z" stroke-width="2"/%3E%3Crect x="330" y="135" width="18" height="18" stroke-width="2" transform="rotate(-25 339 144)"/%3E%3Cline x1="297" y1="182" x2="303" y2="182" stroke-width="1.5"/%3E%3Cpath d="M450 520L550 520L450 460Z" stroke-width="2"/%3E%3Crect x="480" y="475" width="18" height="18" stroke-width="2" transform="rotate(-25 489 484)"/%3E%3Cline x1="447" y1="522" x2="453" y2="522" stroke-width="1.5"/%3E%3Cpath d="M600 300L700 300L600 240Z" stroke-width="2"/%3E%3Crect x="630" y="255" width="18" height="18" stroke-width="2" transform="rotate(-25 639 264)"/%3E%3Cline x1="597" y1="302" x2="603" y2="302" stroke-width="1.5"/%3E%3C!-- 木板上的滑块 --%3E%3Cline x1="50" y1="250" x2="150" y2="250" stroke-width="2.5"/%3E%3Crect x="60" y="242" width="80" height="8" stroke-width="2"/%3E%3Crect x="80" y="224" width="20" height="18" stroke-width="2"/%3E%3Cline x1="47" y1="252" x2="53" y2="252" stroke-width="1.5"/%3E%3Cline x1="550" y1="450" x2="650" y2="450" stroke-width="2.5"/%3E%3Crect x="560" y="442" width="80" height="8" stroke-width="2"/%3E%3Crect x="580" y="424" width="20" height="18" stroke-width="2"/%3E%3Cline x1="547" y1="452" x2="553" y2="452" stroke-width="1.5"/%3E%3C!-- 抛物线轨迹 --%3E%3Cpath d="M100 380Q180 340 260 380" stroke-width="2" stroke-dasharray="4,4"/%3E%3Ccircle cx="120" cy="373" r="4" stroke-width="2"/%3E%3Ccircle cx="180" cy="353" r="4" stroke-width="2"/%3E%3Ccircle cx="240" cy="373" r="4" stroke-width="2"/%3E%3Cpath d="M450 220Q530 180 610 220" stroke-width="2" stroke-dasharray="4,4"/%3E%3Ccircle cx="470" cy="213" r="4" stroke-width="2"/%3E%3Ccircle cx="530" cy="193" r="4" stroke-width="2"/%3E%3Ccircle cx="590" cy="213" r="4" stroke-width="2"/%3E%3C!-- 电压表 --%3E%3Ccircle cx="70" cy="480" r="20" stroke-width="2"/%3E%3Ctext x="62" y="487" font-size="14" fill="none" stroke="%23ff9800" stroke-width="0.5"%3EV%3C/text%3E%3Cline x1="70" y1="458" x2="70" y2="445" stroke-width="2"/%3E%3Cline x1="70" y1="502" x2="70" y2="515" stroke-width="2"/%3E%3Ccircle cx="330" cy="530" r="20" stroke-width="2"/%3E%3Ctext x="322" y="537" font-size="14" fill="none" stroke="%23ff9800" stroke-width="0.5"%3EV%3C/text%3E%3Cline x1="330" y1="508" x2="330" y2="495" stroke-width="2"/%3E%3C!-- 电流表 --%3E%3Ccircle cx="730" cy="530" r="20" stroke-width="2"/%3E%3Ctext x="722" y="537" font-size="14" fill="none" stroke="%23ff9800" stroke-width="0.5"%3EA%3C/text%3E%3Cline x1="708" y1="530" x2="695" y2="530" stroke-width="2"/%3E%3Cline x1="752" y1="530" x2="765" y2="530" stroke-width="2"/%3E%3C!-- 电路图 --%3E%3Cpath d="M600 550L600 510L680 510L680 550L600 550" stroke-width="2"/%3E%3Ccircle cx="640" cy="510" r="12" stroke-width="2"/%3E%3Cline x1="633" y1="510" x2="647" y2="510" stroke-width="2"/%3E%3Cline x1="640" y1="503" x2="640" y2="517" stroke-width="2"/%3E%3Cpath d="M650 525L660 518L670 532L680 518L690 530" stroke-width="2"/%3E%3Cpath d="M50 150L50 110L120 110L120 150L50 150" stroke-width="2"/%3E%3Crect x="60" y="120" width="10" height="20" stroke-width="2"/%3E%3Crect x="75" y="123" width="10" height="14" stroke-width="2"/%3E%3Cline x1="50" y1="110" x2="120" y2="110" stroke-width="2"/%3E%3Cline x1="50" y1="150" x2="120" y2="150" stroke-width="2"/%3E%3Cpath d="M95 130L103 124L111 136L119 124L127 134" stroke-width="2"/%3E%3C!-- 磁场 --%3E%3Crect x="350" y="350" width="22" height="55" stroke-width="2"/%3E%3Ctext x="355" y="380" font-size="14" fill="none" stroke="%23ff9800" stroke-width="0.5"%3EN%3C/text%3E%3Ctext x="356" y="398" font-size="14" fill="none" stroke="%23ff9800" stroke-width="0.5"%3ES%3C/text%3E%3Cpath d="M320 365Q335 362 350 365" stroke-width="1.5"/%3E%3Cpath d="M320 378Q335 375 350 378" stroke-width="1.5"/%3E%3Cpath d="M320 391Q335 388 350 391" stroke-width="1.5"/%3E%3Cpath d="M375 365Q390 368 405 365" stroke-width="1.5"/%3E%3Cpath d="M375 378Q390 381 405 378" stroke-width="1.5"/%3E%3Cpath d="M375 391Q390 394 405 391" stroke-width="1.5"/%3E%3C!-- 杠杆 --%3E%3Cline x1="480" y1="370" x2="600" y2="350" stroke-width="2.5"/%3E%3Cpath d="M535 358L535 372L545 372L545 358Z" stroke-width="2"/%3E%3Crect x="477" y="362" width="14" height="12" stroke-width="2"/%3E%3Crect x="595" y="342" width="14" height="12" stroke-width="2"/%3E%3C!-- 力矢量 --%3E%3Cline x1="250" y1="280" x2="320" y2="250" stroke-width="2"/%3E%3Cpolygon points="316,252 323,249 318,258" stroke="%23ff9800" stroke-width="2"/%3E%3Cline x1="250" y1="280" x2="320" y2="310" stroke-width="2"/%3E%3Cpolygon points="316,308 323,311 318,302" stroke="%23ff9800" stroke-width="2"/%3E%3Cline x1="250" y1="280" x2="350" y2="280" stroke-width="2.5" stroke-dasharray="3,3"/%3E%3Cpolygon points="345,278 352,280 345,282" stroke="%23ff9800" stroke-width="2"/%3E%3C/g%3E%3C/svg%3E');background-repeat:repeat;background-size:400px 300px;animation:physics-bg-subtle 60s ease-in-out infinite}@keyframes physics-bg-subtle{0%,to{transform:translate(0) scale(1)}25%{transform:translate(5px,-5px) scale(1.01)}50%{transform:translate(-3px,3px) scale(.99)}75%{transform:translate(3px,-3px) scale(1.01)}}body>*{position:relative;z-index:1}.page-wrapper{padding:8px 24px 24px;height:100vh;overflow:hidden}.topbar{display:flex;align-items:center;justify-content:space-between;margin-bottom:20px}.topbar-right{display:flex;align-items:center;gap:12px}.auth-hint{color:var(--text-muted)}.upload-area{position:relative;height:55vh;max-width:73vw;border-radius:28px;border:1px solid #000000;background:var(--card-bg);display:flex;align-items:stretch;justify-content:stretch;overflow:hidden;box-shadow:0 4px 16px #ff980026}.upload-split-left{flex:2 1 0%;min-width:0;position:relative;display:flex;align-items:center;justify-content:center}.upload-split-right{flex:1 1 0%;min-width:0;position:relative;border-left:1px solid #000000}.upload-text{color:var(--text-primary);font-size:18px}.start-btn-wrapper{display:flex;gap:12px;align-items:center}.start-btn{padding:10px 18px;border-radius:12px;border:1px solid #000000;background:linear-gradient(135deg,#fff,#fffef8);color:var(--primary);cursor:pointer;transition:all .2s;font-weight:500}.start-btn:hover{background:linear-gradient(135deg,#fff8e1,#ffeaa7);border-color:#000;box-shadow:0 4px 12px #ff980033;transform:translateY(-1px)}.topbar-left{display:flex;align-items:center;gap:16px}.selector{display:flex;gap:12px}.selector a{padding:8px 14px;border:1px solid #000000;border-radius:12px;color:var(--primary);text-decoration:none;background:var(--card-bg);transition:all .2s;font-weight:500}.selector a:hover{background:linear-gradient(135deg,#fff8e1,#ffeaa7);border-color:var(--primary-light);box-shadow:0 2px 8px #ff980026;transform:translateY(-1px)}.scene-selector{display:flex;gap:10px;padding:6px;background:#ffffffe6;border-radius:16px;box-shadow:0 2px 8px #00000014;margin-top:4px}.scene-btn{padding:8px 16px;border-radius:12px;border:none;background:transparent;color:var(--text-muted);cursor:pointer;transition:all .2s;font-weight:600;font-size:15px;min-width:120px}.scene-btn:hover{background:#ff980026;color:var(--text-primary);transform:translateY(-1px)}.scene-btn.active{background:linear-gradient(135deg,#fff8e1,#ffeaa7);color:var(--text-primary);box-shadow:0 3px 8px #ff980040;transform:translateY(-1px)}.canvas-holder{position:absolute;top:0;right:0;bottom:0;left:0;border-radius:24px;pointer-events:auto;cursor:crosshair}.status-line{margin-top:8px;color:var(--text-primary)}.site-footer{position:fixed;bottom:4px;left:50%;transform:translate(-50%);text-align:center;z-index:50;pointer-events:none}.footer-decorator{position:relative;display:flex;align-items:center;justify-content:center;margin-bottom:6px;max-width:500px;margin-left:auto;margin-right:auto}.footer-decorator:before,.footer-decorator:after{content:"";flex:1;height:1px;background:linear-gradient(to right,transparent,rgba(102,102,102,.2),transparent)}.footer-decorator:before{margin-right:12px}.footer-decorator:after{margin-left:12px}.footer-dot{width:5px;height:5px;border-radius:50%;background:#ff990059}.beian-info{display:inline-flex;align-items:center;gap:6px;font-size:12px;color:var(--text-muted);opacity:.7}.beian-info *{pointer-events:auto}.beian-icon{width:16px;height:18px;vertical-align:middle}.beian-link{color:var(--text-muted);text-decoration:none;transition:all .2s ease;display:inline-flex;align-items:center;gap:3px}.beian-link:hover{color:var(--primary-light);opacity:1}.beian-info .divider{color:#6666;margin:0 4px}.toast-container{position:fixed;top:20px;left:50%;transform:translate(-50%) translateY(-20px);z-index:9999;display:flex;align-items:center;gap:6px;padding:0;min-width:auto;max-width:500px;border-radius:0;border:none;background:transparent;box-shadow:none;opacity:0;transition:all .3s ease;pointer-events:none}.toast-container.toast-show{transform:translate(-50%) translateY(0);opacity:1}.toast-container.toast-hide{transform:translate(-50%) translateY(-20px);opacity:0}.toast-icon{display:none}.toast-message{flex:1;color:#333;font-size:16px;font-weight:400;line-height:1.4;white-space:pre-line;text-shadow:0 1px 2px rgba(255,255,255,.8)}.toast-success .toast-message{color:#16a34a}.toast-error .toast-message{color:#dc2626}.toast-warning .toast-message{color:#ea580c}.toast-info .toast-message{color:#2563eb}@media (max-width: 600px){.toast-container{min-width:0;max-width:calc(100vw - 40px);padding:0}.toast-message{font-size:14px}}
