*{margin:0;padding:0;box-sizing:border-box}:root{--bg-primary: #0f0f23;--bg-secondary: #1a1a2e;--bg-panel: #16213e;--border: #2a2a4a;--text-primary: #e0e0e0;--text-secondary: #8888aa;--accent: #6c63ff;--accent-hover: #7b73ff;--success: #4caf50;--error: #ff5252;--radius: 8px}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,sans-serif;background:var(--bg-primary);color:var(--text-primary)}.app{display:flex;flex-direction:column;height:100vh;overflow:hidden;position:relative}.welcome-bar{position:absolute;top:0;left:0;right:0;z-index:1;display:flex;align-items:center;justify-content:space-between;padding:12px 24px;background:linear-gradient(to bottom,rgba(15,15,35,.5) 0%,rgba(15,15,35,.12) 50%,transparent 100%);backdrop-filter:blur(4px);-webkit-backdrop-filter:blur(4px);gap:24px}model-viewer{--progress-bar-height: 0;--progress-mask: transparent}model-viewer::part(default-progress-bar),model-viewer::part(default-ar-button){display:none!important}.welcome-bar-left{display:flex;align-items:baseline;gap:14px;flex-shrink:0}.welcome-bar-title{font-size:22px;font-weight:700;white-space:nowrap}.welcome-bar-title .logo{font-size:26px}.welcome-bar-desc{font-size:13px;color:var(--text-secondary);white-space:nowrap}.welcome-bar-right{display:flex;align-items:center;gap:12px}.welcome-bar-upload .upload-zone{margin:0;padding:10px 18px;border-style:solid;border-color:#ffffff1f;background:#ffffff0a;border-radius:6px;font-size:13px}.welcome-bar-upload .upload-zone:hover{border-color:var(--accent);background:#6c63ff1a}.welcome-bar-upload .upload-content{gap:2px}.welcome-bar-upload .upload-icon{font-size:22px}.welcome-bar-upload .upload-hint{font-size:11px}.btn-welcome{padding:10px 20px;font-size:13px;border:1px solid var(--accent);background:#6c63ff26;color:var(--text-primary);border-radius:6px;cursor:pointer;transition:all .2s;white-space:nowrap;flex-shrink:0}.btn-welcome:hover{background:var(--accent)}.browser-hint{position:absolute;bottom:80px;left:16px;z-index:2;font-size:11px;color:var(--text-secondary);background:#0f0f2380;-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);padding:4px 10px;border-radius:4px;border:1px solid rgba(255,255,255,.06)}.click-hint{position:absolute;bottom:52px;left:16px;z-index:2;font-size:11px;color:var(--text-secondary);background:#6c63ff33;-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);padding:4px 10px;border-radius:4px;border:1px solid rgba(108,99,255,.25);animation:hintPulse 2s ease-in-out infinite}@keyframes hintPulse{0%,to{opacity:.6}50%{opacity:1}}.app-header{display:flex;justify-content:space-between;align-items:center;padding:12px 20px;background:var(--bg-secondary);border-bottom:1px solid var(--border);flex-shrink:0}.app-header h1{font-size:18px;font-weight:600;display:flex;align-items:center;gap:8px}.app-header 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var(--border);background:transparent;color:var(--text-secondary);font-size:12px;font-weight:700;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .2s;line-height:1;padding:0}.bone-help-toggle:hover,.bone-help-toggle.active{border-color:var(--accent);color:var(--accent);background:#6c63ff1a}.bone-help-panel{margin:0 12px 10px;padding:12px;background:var(--bg-panel);border:1px solid var(--border);border-radius:8px;display:flex;flex-direction:column;gap:14px;font-size:12px;line-height:1.6;color:var(--text-secondary);max-height:360px;overflow-y:auto}.bone-help-section{display:flex;flex-direction:column;gap:6px}.bone-help-section+.bone-help-section{padding-top:12px;border-top:1px solid var(--border)}.bone-help-title{font-size:13px;font-weight:600;color:var(--text-primary)}.bone-help-text{margin:0}.bone-help-text strong{color:var(--accent)}.bone-help-diagram{display:flex;align-items:center;gap:6px;padding:8px 10px;background:var(--bg-input, 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