:root{--bg-primary: #f7f8fc;--bg-secondary: #eef2f6;--bg-tertiary: #e5eaf0;--text-primary: #2d3748;--text-secondary: #4a5568;--text-tertiary: #718096;--border-color: #d1d9e0;--border-light: #e0e6ed;--border-subtle: #ebf0f5;--link-color: #3182ce;--link-hover: #2c5282;--shadow-light: rgba(0, 0, 0, .08);--shadow-medium: rgba(0, 0, 0, .12);--tag-bg: #007bff;--tag-text: white;--tech-bg: #d1d9e0;--tech-text: #4a5568}body.dark-mode{--bg-primary: #0f172a;--bg-secondary: #1e293b;--bg-tertiary: #334155;--text-primary: #e2e8f0;--text-secondary: #94a3b8;--text-tertiary: #64748b;--border-color: #334155;--border-light: #1e293b;--border-subtle: #334155;--link-color: #60a5fa;--link-hover: #93bbfc;--shadow-light: rgba(0, 0, 0, .3);--shadow-medium: rgba(0, 0, 0, .5);--tag-bg: #3b82f6;--tag-text: white;--tech-bg: #334155;--tech-text: #cbd5e1}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;line-height:1.6;color:var(--text-primary);background-color:var(--bg-primary);transition:background-color .3s ease,color .3s ease;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}.App{min-height:100vh;display:flex;flex-direction:column}.App-header{background-color:var(--bg-secondary);color:var(--text-primary);padding:2rem;text-align:center;border-bottom:1px solid var(--border-light)}.header-content{display:flex;align-items:center;justify-content:space-between;gap:1rem;position:relative;max-width:1200px;margin:0 auto;width:100%}.home-button{position:absolute;left:0;top:50%;transform:translateY(-50%);font-size:1.5rem;text-decoration:none;color:var(--text-secondary);background:var(--bg-tertiary);padding:.5rem;border-radius:50%;transition:all .2s ease;display:flex;align-items:center;justify-content:center;width:3rem;height:3rem;border:1px solid var(--border-color)}.home-button:hover{background:var(--bg-primary);color:var(--text-primary);transform:translateY(-50%) scale(1.05)}.header-text{flex:1;text-align:center}.theme-toggle{display:flex;align-items:center;gap:8px;background:none;border:none;cursor:pointer;padding:4px}.toggle-track{position:relative;width:48px;height:24px;background-color:var(--bg-tertiary);border-radius:12px;border:1px solid var(--border-color);transition:background-color .3s ease}.toggle-thumb{position:absolute;top:2px;left:2px;width:18px;height:18px;background-color:#fff;border-radius:50%;transition:transform .3s ease;box-shadow:0 2px 4px var(--shadow-light)}.toggle-thumb.dark{transform:translate(24px)}.toggle-icon{font-size:16px}body.dark-mode .toggle-track{background-color:var(--tag-bg);border-color:var(--tag-bg)}.App-header h1{margin:0 0 .5rem;font-size:2.5rem;font-weight:700;color:var(--text-primary)}.App-header p{margin:0;font-size:1.1rem;color:var(--text-secondary)}.App-main{flex:1;padding:2rem;max-width:1200px;margin:0 auto;width:100%}.upload-section{max-width:600px;margin:2rem auto}.error-message{background:#fee;border:1px solid #fcc;border-radius:8px;padding:1rem;margin-top:1rem;color:#c33;text-align:center;box-shadow:0 2px 4px var(--shadow-light)}.error-message p{margin:0}.viewer-section{height:calc(100vh - 200px);display:flex;flex-direction:column}.controls{display:flex;justify-content:space-between;align-items:center;margin-bottom:1rem;padding:1.5rem;background:var(--bg-secondary);border-radius:8px;border:1px solid var(--border-color);transition:all .3s ease}.reset-button{text-decoration:none;color:var(--link-color);font-weight:500;padding:10px 20px;border:1px solid var(--link-color);border-radius:5px;transition:all .3s ease;cursor:pointer;font-size:1rem;background:none}.reset-button:hover{background-color:var(--link-color);color:#fff}.help-text{color:var(--text-tertiary);font-size:.9rem}.content-grid{display:grid;grid-template-columns:2fr 1fr;gap:1rem;height:100%;min-height:0}.viewer-container{background:var(--bg-secondary);border-radius:8px;overflow:hidden;border:1px solid var(--border-color);transition:all .3s ease;min-height:0}.three-viewer{width:100%;height:100%;min-height:500px;cursor:grab}.three-viewer canvas{display:block;outline:none;pointer-events:auto}.info-container{display:flex;flex-direction:column;min-height:0;overflow-y:auto}.App-footer{background:var(--bg-secondary);color:var(--text-secondary);text-align:center;padding:1.5rem;margin-top:auto;border-top:1px solid var(--border-light)}.App-footer p{margin:0;color:var(--text-tertiary)}@media (max-width: 1024px){.content-grid{grid-template-columns:1fr;grid-template-rows:1fr auto}.viewer-container{min-height:400px}.App-main{padding:1rem}}@media (max-width: 768px){.App{padding:0}.App-header{padding:1rem}.header-content{flex-wrap:wrap;gap:.5rem}.App-header h1{font-size:2rem}.App-header p{font-size:1rem}.home-button{position:static;transform:none;width:2.5rem;height:2.5rem;font-size:1.2rem}.theme-toggle{order:3}.header-text{order:2;flex:100%;margin:.5rem 0}.controls{flex-direction:column;gap:.5rem;text-align:center}.help-text{font-size:.8rem}.content-grid{gap:.5rem}.reset-button{width:100%}}