*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;line-height:1.6;color:#1a1a2e;background:#f5f6fa;min-height:100vh;display:flex;flex-direction:column}.nav{background:#fff;border-bottom:1px solid #e2e5ed;position:sticky;top:0;z-index:100}.nav-inner{max-width:1100px;margin:0 auto;padding:0 1.5rem;height:56px;display:flex;align-items:center;gap:2rem}.nav-logo{font-weight:700;font-size:1.15rem;color:#4361ee;text-decoration:none;white-space:nowrap}.nav-links{display:flex;gap:.25rem;overflow-x:auto;flex:1}.nav-link{padding:.4rem .75rem;border-radius:6px;font-size:.85rem;color:#555;text-decoration:none;white-space:nowrap;transition:background .15s,color .15s}.nav-link:hover{background:#f0f2ff;color:#4361ee}.nav-link.active{background:#eef0ff;color:#4361ee;font-weight:600}.nav-toggle{display:none;background:none;border:none;cursor:pointer;padding:4px;flex-direction:column;gap:4px}.nav-toggle span{display:block;width:20px;height:2px;background:#333;transition:transform .2s}main{flex:1;max-width:1100px;width:100%;margin:0 auto;padding:2rem 1.5rem}.tool-container{background:#fff;border-radius:12px;padding:2rem;box-shadow:0 1px 4px #0000000f;margin-bottom:2rem}.tool-header{margin-bottom:1.5rem}.tool-header h1{font-size:1.6rem;color:#1a1a2e}.tool-header p{color:#6c757d;margin-top:.25rem}.ad-slot{text-align:center;padding:.5rem;min-height:0}.faq-section{margin-top:3rem}.faq-section h2{font-size:1.3rem;margin-bottom:1rem}.faq-item{margin-bottom:1.25rem}.faq-item h3{font-size:.95rem;color:#333;margin-bottom:.2rem}.faq-item p{color:#6c757d;font-size:.9rem}footer{border-top:1px solid #e2e5ed;background:#fff;margin-top:auto}.footer-inner{max-width:1100px;margin:0 auto;padding:2rem 1.5rem}.footer-tools h3{font-size:.9rem;color:#999;margin-bottom:.5rem}.footer-tools ul{list-style:none;display:flex;flex-wrap:wrap;gap:.5rem 1.5rem}.footer-tools a{color:#555;text-decoration:none;font-size:.85rem}.footer-tools a:hover{color:#4361ee}.footer-copy{color:#adb5bd;font-size:.8rem;margin-top:1.5rem}.btn{background:#4361ee;color:#fff;border:none;padding:.65rem 1.25rem;border-radius:8px;font-size:.95rem;cursor:pointer;transition:background .15s}.btn:hover{background:#3a56d4}textarea,input[type=text],input[type=number],select{width:100%;padding:.65rem;border:2px solid #e2e5ed;border-radius:8px;font-size:.95rem;font-family:inherit;transition:border-color .15s}textarea:focus,input:focus,select:focus{outline:none;border-color:#4361ee}.related-tools{margin-top:3rem}.related-tools h2{font-size:1.2rem;margin-bottom:1rem}.related-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:1rem}.related-card{background:#fff;border:1px solid #e2e5ed;border-radius:10px;padding:1.25rem;text-decoration:none;color:inherit;transition:box-shadow .15s}.related-card:hover{box-shadow:0 4px 12px #00000014}.related-card h3{font-size:.95rem;color:#1a1a2e}.related-card p{font-size:.8rem;color:#6c757d;margin-top:.25rem}.input-group{margin-bottom:1rem}.input-group label{display:block;font-weight:600;font-size:.9rem;color:#333;margin-bottom:.35rem}.input-group .hint{font-weight:400;font-size:.8rem;color:#999}.input-row{display:flex;gap:1rem;align-items:flex-end}.input-row .input-group{flex:1}.toggle-group{display:inline-flex;border:2px solid #e2e5ed;border-radius:8px;overflow:hidden;margin-bottom:1rem}.toggle-group button{padding:.5rem 1rem;border:none;background:#fff;font-size:.85rem;cursor:pointer;color:#555;transition:all .15s}.toggle-group button.active{background:#4361ee;color:#fff}.toggle-group button:not(:last-child){border-right:1px solid #e2e5ed}.option-row{display:flex;align-items:center;gap:.5rem;padding:.5rem 0}.option-row input[type=checkbox]{width:18px;height:18px;accent-color:#4361ee}.option-row label{font-size:.9rem;color:#333;cursor:pointer}.result-box{background:#f8f9fc;border:2px solid #e2e5ed;border-radius:10px;padding:1.25rem;margin:1rem 0}.result-box.success{border-color:#22c55e;background:#f0fdf4}.result-box.error{border-color:#ef4444;background:#fef2f2}.result-box .result-label{font-size:.8rem;color:#999;text-transform:uppercase;letter-spacing:.5px;margin-bottom:.25rem}.result-box .result-value{font-size:1.5rem;font-weight:700;color:#1a1a2e;word-break:break-all}.result-box .result-detail{font-size:.9rem;color:#6c757d;margin-top:.25rem}.output-display{display:flex;align-items:center;gap:.5rem;background:#f8f9fc;border:2px solid #e2e5ed;border-radius:8px;padding:.5rem .75rem;margin-bottom:1rem}.output-display input,.output-display textarea{flex:1;border:none;background:transparent;font-family:SF Mono,Fira Code,monospace;font-size:.95rem}.output-display input:focus,.output-display textarea:focus{outline:none;border:none}.btn-copy{background:none;border:1px solid #e2e5ed;border-radius:6px;padding:.4rem .6rem;font-size:.8rem;cursor:pointer;color:#555;white-space:nowrap;transition:all .15s}.btn-copy:hover{border-color:#4361ee;color:#4361ee}.btn-copy.copied{border-color:#22c55e;color:#22c55e}.btn-row{display:flex;gap:.75rem;margin:1.25rem 0;flex-wrap:wrap}.btn-secondary{background:#f0f2ff;color:#4361ee;border:none;padding:.65rem 1.25rem;border-radius:8px;font-size:.95rem;cursor:pointer;transition:background .15s}.btn-secondary:hover{background:#dde1ff}.meter{height:6px;background:#e2e5ed;border-radius:3px;overflow:hidden;margin:.5rem 0}.meter-fill{height:100%;border-radius:3px;transition:width .3s,background .3s}.meter-label{font-size:.8rem;color:#6c757d}.range-group{margin-bottom:1rem}.range-group .range-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:.35rem}.range-group .range-header label{font-weight:600;font-size:.9rem;color:#333}.range-group .range-value{font-weight:700;color:#4361ee;font-size:.95rem}.range-group input[type=range]{width:100%;accent-color:#4361ee}textarea.code{font-family:SF Mono,Fira Code,monospace;font-size:.85rem;line-height:1.5;resize:vertical;min-height:120px}.tool-columns{display:grid;grid-template-columns:1fr 1fr;gap:1.5rem}.tool-column{display:flex;flex-direction:column}.tool-column-header{font-size:.85rem;font-weight:600;color:#999;text-transform:uppercase;letter-spacing:.5px;margin-bottom:.75rem}.tool-section{margin-top:1.5rem;padding-top:1.5rem;border-top:1px solid #e2e5ed}.tool-section-title{font-size:1rem;font-weight:600;color:#1a1a2e;margin-bottom:1rem}@media(max-width:768px){.nav-links{display:none;position:absolute;top:56px;left:0;right:0;background:#fff;flex-direction:column;padding:1rem;border-bottom:1px solid #e2e5ed}.nav-links.open,.nav-toggle{display:flex}.tool-container{padding:1.25rem}main{padding:1rem}.tool-columns{grid-template-columns:1fr}.input-row{flex-direction:column}}