:root{--bg-color: #f4f4f9;--sidebar-bg: #ffffff;--text-color: #333333;--primary-color: #4a90e2;--accent-color: #ff6b6b;--border-color: #e0e0e0;--shadow: 0 4px 6px rgba(0, 0, 0, .1);--radius: 8px;--font-family: "Inter", system-ui, Avenir, Helvetica, Arial, sans-serif}*{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-family);background-color:var(--bg-color);color:var(--text-color);line-height:1.5;-webkit-font-smoothing:antialiased}button{cursor:pointer;border:none;font-family:inherit}input{font-family:inherit}.sheet-input-container{padding:15px;background-color:#f9f9f9;border-radius:var(--radius);margin-bottom:20px;border:1px solid var(--border-color)}.sheet-input-container h3{font-size:1rem;margin-bottom:10px;color:var(--text-color)}.input-group{display:flex;gap:10px}.input-group label{display:flex;flex-direction:column;font-size:.85rem;color:#666;flex:1}.input-group input{margin-top:5px;padding:8px;border:1px solid var(--border-color);border-radius:4px;font-size:1rem;width:100%}.input-group input:focus{outline:none;border-color:var(--primary-color);box-shadow:0 0 0 2px #4a90e233}.part-input-container{padding:15px;background-color:#f9f9f9;border-radius:var(--radius);margin-bottom:20px;border:1px solid var(--border-color)}.part-input-container h3{font-size:1rem;margin-bottom:10px;color:var(--text-color)}.input-row{display:flex;gap:10px;margin-bottom:10px;align-items:flex-end}.input-row label{display:flex;flex-direction:column;font-size:.85rem;color:#666;flex:1}.input-row input{margin-top:5px;padding:8px;border:1px solid var(--border-color);border-radius:4px;font-size:1rem;width:100%}.add-btn{background-color:var(--primary-color);color:#fff;padding:8px 16px;border-radius:4px;font-weight:600;height:38px;margin-top:auto;transition:background-color .2s}.add-btn:hover{background-color:#357abd}.part-list-container{flex:1;display:flex;flex-direction:column;overflow:hidden}.part-list-container h3{font-size:1rem;margin-bottom:10px;color:var(--text-color)}.empty-msg{color:#999;font-style:italic;font-size:.9rem}.part-list{list-style:none;overflow-y:auto;flex:1;padding-right:5px}.part-item{display:flex;justify-content:space-between;align-items:center;padding:10px;background-color:#fff;border:1px solid var(--border-color);border-radius:4px;margin-bottom:8px}.part-info{display:flex;flex-direction:column;gap:4px}.dims-edit{display:flex;align-items:center;gap:5px}.count-edit{display:flex;align-items:center;gap:5px;color:#666;font-size:.9rem}.inline-input{width:60px;padding:4px;border:1px solid transparent;border-radius:3px;font-size:.95rem;font-weight:600;background-color:transparent;transition:all .2s}.inline-input:hover{border-color:#ddd;background-color:#f9f9f9}.inline-input:focus{outline:none;border-color:var(--primary-color);background-color:#fff;box-shadow:0 0 0 2px #4a90e21a}.inline-input.count{width:40px;font-weight:400}.x-sep{color:#999;font-size:.8rem}.part-actions{display:flex;gap:5px}.icon-btn{background:none;border:1px solid var(--border-color);border-radius:4px;padding:4px 8px;font-size:.9rem;color:#666;transition:all .2s}.icon-btn:hover{background-color:#f0f0f0;color:#333}.icon-btn.delete:hover{background-color:#ffebee;color:#d32f2f;border-color:#ffcdd2}.language-switcher{display:flex;align-items:center;gap:8px}.language-select{padding:8px 12px;border:1px solid #e5e7eb;border-radius:6px;background-color:#fff;font-size:14px;cursor:pointer;transition:all .2s ease;outline:none}.language-select:hover{border-color:#4f46e5;box-shadow:0 0 0 3px #4f46e51a}.language-select:focus{border-color:#4f46e5;box-shadow:0 0 0 3px #4f46e533}.language-select option{padding:8px}@media(prefers-color-scheme:dark){.language-select{background-color:#1f2937;border-color:#374151;color:#f9fafb}.language-select:hover{border-color:#6366f1}}.sidebar{width:350px;background-color:var(--sidebar-bg);border-right:1px solid var(--border-color);display:flex;flex-direction:column;box-shadow:var(--shadow);z-index:10}.sidebar-header{display:flex;justify-content:space-between;align-items:center;padding:20px;border-bottom:1px solid var(--border-color);gap:10px}.logo{font-size:1.5rem;font-weight:700;color:var(--primary-color);margin:0}.sidebar-content{padding:20px;overflow-y:auto;flex:1}.sidebar-footer{padding:20px;border-top:1px solid var(--border-color);background-color:#00000005;font-size:.85rem;color:var(--text-secondary)}.app-description{margin-bottom:12px;line-height:1.5}.contact-info{margin:0;font-weight:500}.contact-info a{color:var(--primary-color);text-decoration:none}.contact-info a:hover{text-decoration:underline}.part{border:1px solid rgba(0,0,0,.2);box-sizing:border-box;display:flex;justify-content:center;align-items:center;cursor:grab;-webkit-user-select:none;user-select:none;transition:box-shadow .2s;overflow:hidden}.part:active{cursor:grabbing;box-shadow:0 0 10px #0000004d;z-index:100}.part-label{font-size:10px;color:#0009;pointer-events:none;white-space:nowrap}.rotate-btn{position:absolute;top:2px;right:2px;background:#ffffffb3;border:none;border-radius:50%;width:16px;height:16px;font-size:10px;display:flex;justify-content:center;align-items:center;cursor:pointer;opacity:0;transition:opacity .2s}.part:hover .rotate-btn{opacity:1}.rotate-btn:hover{background:#fff}.sheet{background-color:#fff;position:relative;box-shadow:0 0 20px #0000001a;background-image:linear-gradient(45deg,#f0f0f0 25%,transparent 25%),linear-gradient(-45deg,#f0f0f0 25%,transparent 25%),linear-gradient(45deg,transparent 75%,#f0f0f0 75%),linear-gradient(-45deg,transparent 75%,#f0f0f0 75%);background-size:20px 20px;background-position:0 0,0 10px,10px -10px,-10px 0px;border:1px solid #ccc}.sheet-dims{position:absolute;bottom:-25px;right:0;font-size:.9rem;color:#666;background:#fffc;padding:2px 5px;border-radius:4px}.canvas-container{flex:1;background-color:var(--bg-color);display:flex;justify-content:center;align-items:center}.canvas-workspace{position:relative;border-radius:var(--radius);display:flex;flex-direction:column;align-items:center;gap:40px;width:100%;min-height:100%;padding-bottom:40px}.sheet-wrapper{display:flex;flex-direction:column;align-items:center;gap:10px;width:100%;flex:1}.sheet-label{font-weight:600;color:#666}.placeholder-sheet{color:#999}.seo-content{max-width:1200px;margin:0 auto;padding:40px 20px;color:var(--text-primary)}.hero-section h1{font-size:2.5rem;color:var(--primary-color);margin-bottom:30px;text-align:center}.intro-section{margin-bottom:50px;text-align:center;max-width:800px;margin-left:auto;margin-right:auto}.intro-section h2{font-size:2rem;margin-bottom:20px}.intro-section p{font-size:1.1rem;line-height:1.6;color:var(--text-secondary)}.features-section{margin-bottom:50px;background-color:var(--bg-secondary);padding:40px;border-radius:12px}.features-section h3{font-size:1.8rem;margin-bottom:30px;text-align:center}.features-list{list-style:none;padding:0;display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:20px}.features-list li{background:var(--bg-primary);padding:20px;border-radius:8px;box-shadow:var(--shadow-sm)}.features-list strong{color:var(--primary-color);display:block;margin-bottom:8px;font-size:1.1rem}.how-it-works-section{margin-bottom:50px}.how-it-works-section h3{font-size:1.8rem;margin-bottom:40px;text-align:center}.steps-container{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:30px}.step-card{text-align:center;padding:30px;background:var(--bg-secondary);border-radius:12px;position:relative}.step-number{width:40px;height:40px;background:var(--primary-color);color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:1.2rem;margin:0 auto 20px}.step-card h4{font-size:1.3rem;margin-bottom:15px}.step-card p{color:var(--text-secondary);line-height:1.5}@media(max-width:768px){.hero-section h1{font-size:1.8rem}.intro-section h2{font-size:1.5rem}.features-list,.steps-container{grid-template-columns:1fr}}.app-layout{display:flex;height:100vh;width:100vw;overflow:hidden;padding-left:160px;padding-right:160px;box-sizing:border-box}.main-content{flex:1;display:flex;flex-direction:column;overflow-y:auto;height:100%}@media(max-width:1400px){.app-layout{padding-left:0;padding-right:0}}