*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;line-height:1.6;color:#333;background-color:#f5f7fa}.container{max-width:1000px;margin:0 auto;padding:20px}header{background-color:#fff;box-shadow:0 2px 4px #0000001a;position:sticky;top:0;z-index:100}.nav-container{max-width:1200px;margin:0 auto;padding:15px 20px;display:flex;justify-content:space-between;align-items:center}.logo{font-size:1.5rem;font-weight:700;color:#2563eb;text-decoration:none}.nav-links{display:flex;gap:25px}.nav-links a{color:#555;text-decoration:none;font-weight:500;transition:color .3s}.nav-links a:hover{color:#2563eb}main{min-height:calc(100vh - 200px);padding:40px 0}.hero-section{text-align:center;padding:60px 20px 40px}.hero-subtitle{font-size:1.2rem;color:#64748b;max-width:700px;margin:20px auto 0}.tools-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:25px;margin:50px 0}.tool-card{background:#fff;border-radius:12px;padding:30px;text-decoration:none;color:inherit;box-shadow:0 2px 8px #00000014;transition:all .3s ease;position:relative;overflow:hidden}.tool-card:hover{transform:translateY(-5px);box-shadow:0 8px 20px #00000026}.tool-icon{width:50px;height:50px;color:#2563eb;margin-bottom:15px}.tool-card h2{font-size:1.4rem;color:#1e293b;margin:15px 0 10px}.tool-card p{color:#64748b;line-height:1.6;margin:0}.tool-tag{position:absolute;top:15px;right:15px;background:#2563eb;color:#fff;font-size:.75rem;padding:4px 10px;border-radius:12px;font-weight:600}.tool-card:nth-child(2) .tool-tag{background:#10b981}.features-section{background:#fff;border-radius:12px;padding:50px 40px;margin:60px 0 40px;box-shadow:0 4px 6px #00000012;text-align:center}.features-section h2{margin-top:0;margin-bottom:40px}.features-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:30px;margin-top:30px}.feature-item h3{font-size:1.1rem;margin-bottom:10px}.feature-item p{color:#64748b;font-size:.95rem;line-height:1.6}.text-tool-container{background:#fff;border-radius:12px;padding:30px;box-shadow:0 4px 6px #00000012}.text-area-group{margin-bottom:25px}.text-area-group label{display:block;font-weight:600;color:#1e293b;margin-bottom:10px;font-size:1.1rem}.text-area-group textarea{width:100%;min-height:200px;padding:15px;border:2px solid #e2e8f0;border-radius:8px;font-family:Courier New,monospace;font-size:.95rem;line-height:1.6;resize:vertical;transition:border-color .3s}.text-area-group textarea:focus{outline:none;border-color:#2563eb}.textarea-info{display:flex;justify-content:space-between;align-items:center;margin-top:10px;color:#64748b;font-size:.9rem}.cleaning-options{margin:30px 0;padding:25px;background:#f8fafc;border-radius:8px}.cleaning-options h3{margin-top:0;margin-bottom:15px;color:#1e293b}.options-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:10px}.btn-option{background:#fff;border:2px solid #e2e8f0;color:#334155;padding:10px 15px;border-radius:6px;font-size:.9rem;font-weight:500;cursor:pointer;transition:all .2s}.btn-option:hover{background:#2563eb;color:#fff;border-color:#2563eb}.btn-copy{background:#2563eb;color:#fff;border:none;padding:8px 16px;border-radius:6px;font-size:.9rem;font-weight:600;cursor:pointer;transition:background .3s}.btn-copy:hover{background:#1d4ed8}.upload-option{text-align:center;padding:20px;background:#f8fafc;border-radius:8px;margin-bottom:20px}.upload-option h3{margin-top:0;margin-bottom:15px}#uploadStatus{display:inline-block;margin-left:15px;font-weight:600}.divider{text-align:center;margin:25px 0;color:#94a3b8;font-weight:600;position:relative}.divider:before,.divider:after{content:"";position:absolute;top:50%;width:40%;height:1px;background:#e2e8f0}.divider:before{left:0}.divider:after{right:0}.calculator-section h3{margin-top:25px;margin-bottom:15px}.helper-text{color:#64748b;font-size:.9rem;font-style:italic;margin-bottom:15px}.dimension-inputs{display:flex;align-items:flex-end;gap:15px;margin-bottom:20px}.input-group{flex:1}.input-group label{display:block;font-weight:600;color:#334155;margin-bottom:8px;font-size:.95rem}.input-group input{width:100%;padding:12px;border:2px solid #e2e8f0;border-radius:6px;font-size:1rem;transition:border-color .3s}.input-group input:focus{outline:none;border-color:#2563eb}.multiply-sign{font-size:1.5rem;color:#94a3b8;font-weight:700;padding-bottom:12px}.aspect-ratio-display{background:#e0f2fe;border-left:4px solid #0284c7;padding:15px;margin:20px 0;border-radius:4px;color:#075985;display:none}.calc-results{background:#f0fdf4;border:2px solid #86efac;border-radius:8px;padding:25px;margin:25px 0}.calc-results h3{margin-top:0;color:#059669}.result-box{display:flex;align-items:center;justify-content:center;gap:20px;margin:20px 0;font-size:1.3rem}.result-item{display:flex;flex-direction:column;align-items:center}.result-label{font-size:.9rem;color:#64748b;margin-bottom:5px}.result-number{font-size:1.8rem;font-weight:700;color:#059669}.ratio-info{margin-top:20px;padding-top:20px;border-top:1px solid #86efac;color:#065f46;line-height:1.8}.common-ratios{margin-top:30px;padding:25px;background:#fef3c7;border-radius:8px}.common-ratios h3{margin-top:0;margin-bottom:15px}.ratio-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:10px}.ratio-btn{background:#fff;border:2px solid #fbbf24;color:#78350f;padding:10px 15px;border-radius:6px;font-size:.9rem;font-weight:600;cursor:pointer;transition:all .2s}.ratio-btn:hover{background:#fbbf24;color:#fff}.mode-selector{display:flex;gap:10px;margin-bottom:25px;justify-content:center}.mode-btn{padding:12px 30px;border:2px solid #e2e8f0;background:#fff;color:#64748b;border-radius:8px;font-size:1rem;font-weight:600;cursor:pointer;transition:all .3s}.mode-btn.active{background:#2563eb;color:#fff;border-color:#2563eb}.input-method{margin-bottom:30px}.method-option{padding:20px;background:#f8fafc;border-radius:8px;margin-bottom:15px}.method-option h3{margin-top:0;margin-bottom:15px}.extension-info{background:#fff;border:2px solid #2563eb;border-radius:12px;padding:30px;margin-top:30px}.extension-info h2{color:#2563eb;font-size:3rem;margin-top:0;margin-bottom:25px;text-align:center}.info-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:20px;margin-bottom:25px}.info-item{padding:15px;background:#f8fafc;border-radius:6px}.info-item strong{display:block;color:#64748b;font-size:.9rem;margin-bottom:5px}.info-item span{color:#1e293b;font-size:1.1rem;font-weight:600}.description-box{background:#e0f2fe;padding:20px;border-radius:8px;margin-bottom:25px}.description-box h3{margin-top:0;color:#0284c7}.description-box p{color:#075985;line-height:1.7;margin:0}.software-box{background:#f0fdf4;padding:20px;border-radius:8px}.software-box h3{margin-top:0;color:#059669}.software-box ul{margin:0;padding-left:20px;color:#065f46}.software-box li{padding:5px 0}h1{font-size:2.5rem;color:#1e293b;text-align:center;margin-bottom:20px}h2{font-size:1.8rem;color:#1e293b;margin:40px 0 20px}h3{font-size:1.3rem;color:#334155;margin:20px 0 10px}.intro-text{text-align:center;max-width:700px;margin:0 auto 40px;color:#64748b;font-size:1.1rem}.upload-section,.tool-section{margin:40px 0}.upload-box{background:#fff;border:3px dashed #cbd5e1;border-radius:12px;padding:60px 40px;text-align:center;cursor:pointer;transition:all .3s ease}.upload-box:hover{border-color:#2563eb;background-color:#f8fafc}.upload-icon{width:80px;height:80px;color:#94a3b8;margin-bottom:20px}.upload-box h3{color:#334155;margin-bottom:10px}.upload-box p{color:#64748b;margin-bottom:20px}.btn-primary{background-color:#2563eb;color:#fff;border:none;padding:12px 32px;font-size:1rem;font-weight:600;border-radius:8px;cursor:pointer;transition:background-color .3s}.btn-primary:hover{background-color:#1d4ed8}.btn-secondary{background-color:#64748b;color:#fff;border:none;padding:12px 32px;font-size:1rem;font-weight:600;border-radius:8px;cursor:pointer;transition:background-color .3s;margin-top:20px}.btn-secondary:hover{background-color:#475569}.result-section{background:#fff;border-radius:12px;padding:40px;margin:40px 0;box-shadow:0 4px 6px #00000012}.result-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:20px;margin:30px 0}.result-card{background:#f8fafc;border:1px solid #e2e8f0;border-radius:8px;padding:20px;text-align:center}.result-label{color:#64748b;font-size:.9rem;font-weight:500;margin-bottom:8px;text-transform:uppercase;letter-spacing:.5px}.result-value{color:#1e293b;font-size:1.8rem;font-weight:700}.dpi-note{background:#fef3c7;border-left:4px solid #f59e0b;padding:15px;margin:20px 0;border-radius:4px;color:#78350f}.recommendation{background:#e0f2fe;border-left:4px solid #0284c7;padding:15px;margin:20px 0;border-radius:4px;color:#075985;line-height:1.6}.status-excellent{color:#059669!important}.status-good{color:#0284c7!important}.status-warning{color:#d97706!important}.status-danger{color:#dc2626!important}.info-section{background:#fff;border-radius:12px;padding:40px;margin:40px 0;box-shadow:0 4px 6px #00000012}.info-section ul{list-style:none;padding-left:0}.info-section li{padding:10px 0;border-bottom:1px solid #e2e8f0}.info-section li:last-child{border-bottom:none}.faq-section{background:#fff;border-radius:12px;padding:40px;margin:40px 0;box-shadow:0 4px 6px #00000012}.faq-item{margin-bottom:30px;padding-bottom:30px;border-bottom:1px solid #e2e8f0}.faq-item:last-child{border-bottom:none;margin-bottom:0;padding-bottom:0}.faq-item h3{color:#1e293b;margin-bottom:10px}.faq-item p{color:#64748b;line-height:1.7}footer{background-color:#1e293b;color:#cbd5e1;padding:30px 0;margin-top:60px}footer .container{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap}.footer-links{display:flex;gap:20px}.footer-links a{color:#cbd5e1;text-decoration:none;transition:color .3s}.footer-links a:hover{color:#fff}@media (max-width: 768px){h1{font-size:2rem}.nav-container{flex-direction:column;gap:15px}.result-grid{grid-template-columns:1fr}.upload-box{padding:40px 20px}footer .container{flex-direction:column;gap:20px;text-align:center}}