:root{--color-primary:#0f0f13;--color-primary-hover:#16213e;--color-accent:#0f7aff;--color-accent-hover:#0062d6;--color-accent-light:#e8f2ff;--color-bg:#ffffff;--color-bg-secondary:#f6f7f9;--color-bg-tertiary:#f0f2f5;--color-result-bg:#f0f7ff;--color-text-primary:#0d0d0d;--color-text-secondary:#3f4753;--color-text-muted:#667085;--color-text-inverse:#ffffff;--color-border:#d7dce3;--color-border-focus:#0f7aff;--color-border-error:#dc3545;--color-success:#1a7f4b;--color-success-bg:#e6f7ed;--color-error:#dc3545;--color-error-bg:#fff0f0;--color-warning:#b45309;--color-warning-bg:#fffbeb;--font-sans:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Helvetica,Arial,sans-serif;--font-mono:'JetBrains Mono','Fira Code',monospace;--text-xs:0.75rem;--text-sm:0.875rem;--text-base:1rem;--text-lg:1.125rem;--text-xl:1.25rem;--text-2xl:1.5rem;--text-3xl:1.875rem;--text-4xl:2.25rem;--font-normal:400;--font-medium:500;--font-semibold:600;--space-1:0.25rem;--space-2:0.5rem;--space-3:0.75rem;--space-4:1rem;--space-5:1.25rem;--space-6:1.5rem;--space-8:2rem;--space-10:2.5rem;--space-12:3rem;--space-16:4rem;--radius-sm:4px;--radius-md:8px;--radius-lg:12px;--radius-xl:16px;--radius-full:9999px;--shadow-sm:0 1px 2px rgba(0,0,0,0.05);--shadow-md:0 4px 12px rgba(0,0,0,0.08);--shadow-lg:0 8px 24px rgba(0,0,0,0.1);--shadow-focus:0 0 0 3px rgba(15,122,255,0.2);--transition-fast:150ms ease;--transition-normal:250ms ease;--max-width-tool:760px;--max-width-content:680px;--max-width-wide:1100px;--max-width-shell:1160px}*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;-webkit-text-size-adjust:100%;scroll-behavior:smooth}body{font-family:var(--font-sans);font-size:var(--text-base);font-weight:var(--font-normal);line-height:1.6;color:var(--color-text-primary);background:var(--color-bg);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}img,svg{display:block;max-width:100%}button,input,select,textarea{font:inherit}a{color:var(--color-accent);text-decoration:none}a:hover{text-decoration:underline}:root{--header-h:62px}body{padding-top:var(--header-h)}#header{position:fixed;inset:0 0 auto 0;height:var(--header-h);background:transparent;backdrop-filter:none;-webkit-backdrop-filter:none;border-bottom:1px solid #111827;z-index:200;transition:background-color var(--transition-fast)}#header .container{height:100%}@media (min-width:769px){#header .container{width:min(calc(100% - var(--space-12)),var(--max-width-shell));max-width:none;padding-inline:0}}#header.scrolled{background:rgba(255,255,255,0.88);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);box-shadow:none}.header-inner{display:flex;align-items:center;height:100%;gap:var(--space-6)}.logo{display:flex;align-items:center;gap:9px;flex-shrink:0;color:var(--color-text-primary);text-decoration:none}.logo:hover{text-decoration:none}.logo-mark{width:28px;height:28px;background:var(--color-primary);border-radius:var(--radius-sm);display:flex;align-items:center;justify-content:center;flex-shrink:0}.logo-mark svg{width:16px;height:16px}.logo-wordmark{font-family:var(--font-sans);font-size:var(--text-lg);font-weight:var(--font-semibold);color:var(--color-text-primary);letter-spacing:-0.025em}.logo-wordmark b{color:inherit;font-weight:700}.header-nav{display:flex;align-items:center;gap:2px;flex:1}.nav-link{font-size:var(--text-sm);font-weight:var(--font-medium);color:var(--color-text-secondary);padding:6px 11px;border-radius:var(--radius-sm);transition:color var(--transition-fast),background var(--transition-fast);white-space:nowrap;text-decoration:none}.nav-link:hover{color:var(--color-text-primary);background:var(--color-bg-secondary);text-decoration:none}#header .nav-link.is-active{color:var(--color-accent);background:var(--color-accent-light)}#header .nav-link.is-active:hover{color:var(--color-accent-hover);background:var(--color-accent-light)}.nav-count{display:inline-flex;align-items:center;font-size:0.65rem;font-weight:var(--font-semibold);color:var(--color-text-muted);background:var(--color-bg-tertiary);border-radius:var(--radius-full);padding:1px 6px;margin-left:4px;vertical-align:middle}.header-actions{display:flex;align-items:center;gap:var(--space-3);flex-shrink:0}.header-search-btn{display:flex;align-items:center;gap:8px;font-size:var(--text-sm);font-weight:var(--font-medium);color:var(--color-text-muted);background:var(--color-bg-secondary);border:1px solid var(--color-border);border-radius:var(--radius-md);padding:7px 12px;transition:color var(--transition-fast),background-color var(--transition-fast),border-color var(--transition-fast),box-shadow var(--transition-fast),transform var(--transition-fast);white-space:nowrap;cursor:pointer}.header-search-btn:hover{color:var(--color-text-primary);border-color:var(--color-text-secondary)}.header-search-btn kbd{font-family:var(--font-mono);font-size:var(--text-xs);color:var(--color-text-muted);background:var(--color-bg);border:1px solid var(--color-border);border-radius:4px;padding:1px 5px}.mobile-btn{display:none;flex-direction:column;gap:5px;padding:8px;color:var(--color-text-primary);border-radius:var(--radius-sm);transition:background var(--transition-fast);background:transparent;border:none;cursor:pointer}.mobile-btn:hover{background:var(--color-bg-secondary)}.mobile-btn span{display:block;width:20px;height:1.5px;background:currentColor;border-radius:2px;transform-origin:center;transition:transform var(--transition-normal),opacity var(--transition-normal)}body.nav-open .mobile-btn span:nth-child(1){transform:translateY(6.5px) rotate(45deg)}body.nav-open .mobile-btn span:nth-child(2){opacity:0;transform:scaleX(0)}body.nav-open .mobile-btn span:nth-child(3){transform:translateY(-6.5px) rotate(-45deg)}.mobile-nav{display:none;position:fixed;top:var(--header-h);left:0;right:0;max-height:calc(100dvh - var(--header-h));overflow-y:auto;overscroll-behavior:contain;background:var(--color-bg);border-bottom:1px solid var(--color-border);padding:var(--space-4) var(--space-6) var(--space-6);flex-direction:column;gap:2px;z-index:190;box-shadow:var(--shadow-lg)}body.nav-open .mobile-nav{display:flex}.mobile-nav-link{display:flex;align-items:center;justify-content:space-between;font-size:var(--text-base);font-weight:var(--font-medium);color:var(--color-text-secondary);padding:10px 12px;border-radius:var(--radius-md);transition:color var(--transition-fast),background-color var(--transition-fast),border-color var(--transition-fast),box-shadow var(--transition-fast),transform var(--transition-fast);text-decoration:none}.mobile-nav-link:hover{color:var(--color-text-primary);background:var(--color-bg-secondary);text-decoration:none}.mobile-nav-link.is-active{color:var(--color-accent);background:var(--color-accent-light)}.mobile-nav-divider{height:1px;background:var(--color-border);margin:8px 0}#footer{background:var(--color-primary);color:rgba(255,255,255,0.6);padding:var(--space-16) 0 0;margin-top:var(--space-10)}.footer-grid{display:grid;grid-template-columns:260px 1fr;gap:var(--space-16);padding-bottom:var(--space-12);border-bottom:1px solid rgba(255,255,255,0.1)}.footer-logo{display:flex;align-items:center;gap:9px;margin-bottom:var(--space-4)}.footer-logo-wordmark{font-family:var(--font-sans);font-size:var(--text-lg);font-weight:var(--font-semibold);color:#fff;letter-spacing:-0.025em}.footer-logo-wordmark b{color:inherit}.footer-tagline{font-size:var(--text-sm);line-height:1.65;margin-bottom:var(--space-4);color:rgba(255,255,255,0.6)}.footer-meta{font-size:var(--text-xs);font-weight:var(--font-semibold);letter-spacing:0.03em;color:rgba(255,255,255,0.3)}.footer-cols{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--space-8)}.footer-col-title{font-size:0.7rem;font-weight:var(--font-semibold);text-transform:uppercase;letter-spacing:0.1em;color:rgba(255,255,255,0.4);margin-bottom:var(--space-4)}.footer-links{display:flex;flex-direction:column;gap:10px}.footer-links a{font-size:var(--text-sm);color:rgba(255,255,255,0.6);transition:color var(--transition-fast);text-decoration:none}.footer-links a:hover{color:#fff;text-decoration:none}.footer-all-link{font-weight:var(--font-semibold);color:rgba(255,255,255,0.4) !important;margin-top:var(--space-1)}.footer-all-link:hover{color:rgba(255,255,255,0.8) !important}.footer-bottom{display:flex;align-items:center;justify-content:space-between;padding:var(--space-5) 0;flex-wrap:wrap;gap:var(--space-4)}.footer-copy{font-size:var(--text-sm);color:rgba(255,255,255,0.4)}.footer-legal{display:flex;gap:var(--space-6)}.footer-legal a{font-size:var(--text-sm);color:rgba(255,255,255,0.4);transition:color var(--transition-fast);text-decoration:none}.footer-legal a:hover{color:rgba(255,255,255,0.8);text-decoration:none}@media (max-width:1024px){.footer-grid{grid-template-columns:1fr;gap:var(--space-10)}.footer-cols{grid-template-columns:repeat(2,1fr)}}@media (max-width:768px){.header-nav,.header-search-btn{display:none}.header-actions>a.btn{display:none}.mobile-btn{display:flex}body.nav-open{overflow:hidden}}@media (max-width:640px){.footer-bottom{flex-direction:column;align-items:flex-start}}.container{width:100%;max-width:var(--max-width-wide);margin:0 auto;padding:0 var(--space-6)}.tool-wrapper{max-width:var(--max-width-tool);margin:0 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a:hover{color:var(--color-accent);text-decoration:none}.breadcrumb-sep{color:var(--color-border);font-size:var(--text-xs);user-select:none}.breadcrumb-current{color:var(--color-text-secondary);font-weight:var(--font-medium)}.tool-title{font-size:var(--text-3xl);font-weight:var(--font-semibold);line-height:1.2;color:var(--color-text-primary);margin-bottom:var(--space-3);letter-spacing:-0.02em}.tool-description{font-size:var(--text-lg);color:var(--color-text-secondary);line-height:1.5;margin-bottom:var(--space-8);max-width:56ch}.section-title{font-size:var(--text-xl);font-weight:var(--font-semibold);color:var(--color-text-primary);margin-bottom:var(--space-4);letter-spacing:-0.01em}.section-subtitle{font-size:var(--text-base);color:var(--color-text-secondary);margin-bottom:var(--space-6)}.tool-card{background:var(--color-bg);border:1px solid var(--color-border);border-radius:var(--radius-xl);padding:var(--space-8);margin-bottom:var(--space-8);box-shadow:var(--shadow-md)}.field{margin-bottom:var(--space-5);min-width:0}.field-label{display:flex;align-items:center;justify-content:space-between;font-size:var(--text-sm);font-weight:var(--font-medium);color:var(--color-text-secondary);margin-bottom:var(--space-2);gap:var(--space-2)}.field-label-text{flex:1}.field-unit{font-size:var(--text-xs);color:var(--color-text-muted);background:var(--color-bg-tertiary);padding:2px 8px;border-radius:var(--radius-full);font-weight:var(--font-normal)}.field-hint{font-size:var(--text-xs);color:var(--color-text-muted);margin-top:var(--space-1)}.field-error{font-size:var(--text-xs);color:var(--color-error);margin-top:var(--space-1);display:none}.field.has-error .field-error{display:block}.field.has-error .input{border-color:var(--color-error)}.field.has-error .input:focus{box-shadow:0 0 0 3px rgba(220,53,69,0.15)}.input-wrapper{position:relative;display:flex;align-items:center}.input-prefix,.input-suffix{position:absolute;font-size:var(--text-sm);color:var(--color-text-muted);pointer-events:none;user-select:none}.input-prefix{left:var(--space-3)}.input-suffix{right:var(--space-3)}.input-wrapper.has-prefix .input{padding-left:var(--space-8)}.input-wrapper.has-suffix .input{padding-right:var(--space-8)}.input{width:100%;height:48px;padding:0 var(--space-4);font-size:var(--text-base);font-weight:var(--font-medium);color:var(--color-text-primary);background:var(--color-bg);border:1.5px solid var(--color-border);border-radius:var(--radius-md);outline:none;transition:border-color var(--transition-fast),box-shadow var(--transition-fast);-webkit-appearance:none;appearance:none}.input:hover{border-color:#c5cad3}.input:focus{border-color:var(--color-border-focus);box-shadow:var(--shadow-focus)}.input::placeholder{color:var(--color-text-muted);font-weight:var(--font-normal)}.input[type="number"]::-webkit-inner-spin-button,.input[type="number"]::-webkit-outer-spin-button{-webkit-appearance:none}.input[type="number"]{appearance:none;-moz-appearance:textfield}.select{width:100%;height:48px;padding:0 var(--space-10) 0 var(--space-4);font-size:var(--text-base);font-weight:var(--font-medium);color:var(--color-text-primary);background:var(--color-bg) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23767676' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E") no-repeat right 12px center;border:1.5px solid var(--color-border);border-radius:var(--radius-md);outline:none;cursor:pointer;transition:border-color var(--transition-fast),box-shadow var(--transition-fast);-webkit-appearance:none;appearance:none}.select:hover{border-color:#c5cad3}.select:focus{border-color:var(--color-border-focus);box-shadow:var(--shadow-focus)}.input-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:var(--space-4)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--space-2);height:48px;padding:0 var(--space-6);font-size:var(--text-base);font-weight:var(--font-medium);border-radius:var(--radius-md);border:1.5px solid transparent;cursor:pointer;transition:color var(--transition-fast),background-color var(--transition-fast),border-color var(--transition-fast),box-shadow var(--transition-fast),transform var(--transition-fast);white-space:nowrap;text-decoration:none;appearance:none;-webkit-appearance:none;outline:none}.btn:focus-visible{box-shadow:var(--shadow-focus)}.btn-primary{background:var(--color-accent);color:var(--color-text-inverse);border-color:var(--color-accent)}.btn-primary:hover{background:var(--color-accent-hover);border-color:var(--color-accent-hover);text-decoration:none}.btn-secondary{background:var(--color-bg);color:var(--color-text-secondary);border-color:var(--color-border)}.btn-secondary:hover{background:var(--color-bg-secondary);color:var(--color-text-primary);text-decoration:none}.btn-ghost{background:transparent;color:var(--color-accent);border-color:transparent;padding:0 var(--space-2);height:auto}.btn-ghost:hover{background:var(--color-accent-light);text-decoration:none}.btn-sm{height:36px;padding:0 var(--space-4);font-size:var(--text-sm)}.btn-full{width:100%}.btn-row{display:flex;gap:var(--space-3);margin-top:var(--space-6)}.result-section{background:var(--color-result-bg);border:1.5px solid rgba(15,122,255,0.15);border-radius:var(--radius-lg);padding:var(--space-6);margin-top:var(--space-6);display:none}.result-section.visible{display:block}.result-section.error-state{background:var(--color-error-bg);border-color:rgba(220,53,69,0.2)}.result-label{font-size:var(--text-sm);font-weight:var(--font-medium);color:var(--color-accent);text-transform:uppercase;letter-spacing:0.06em;margin-bottom:var(--space-2)}.result-section.error-state .result-label{color:var(--color-error)}.result-primary{font-size:var(--text-4xl);font-weight:var(--font-semibold);color:var(--color-text-primary);line-height:1;letter-spacing:-0.03em;margin-bottom:var(--space-1)}.result-unit{font-size:var(--text-lg);color:var(--color-text-muted);font-weight:var(--font-normal);margin-left:var(--space-2)}.result-secondary{font-size:var(--text-sm);color:var(--color-text-secondary);margin-top:var(--space-2)}.result-breakdown{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:var(--space-4);margin-top:var(--space-5);padding-top:var(--space-5);border-top:1px solid rgba(15,122,255,0.1)}.result-item-label{font-size:var(--text-xs);color:var(--color-text-muted);margin-bottom:var(--space-1);text-transform:uppercase;letter-spacing:0.05em}.result-item-value{font-size:var(--text-xl);font-weight:var(--font-semibold);color:var(--color-text-primary)}.result-item-unit{font-size:var(--text-sm);color:var(--color-text-muted);font-weight:var(--font-normal)}.result-actions{display:flex;gap:var(--space-2);margin-top:var(--space-4);flex-wrap:wrap}.divider{border:none;border-top:1px solid var(--color-border);margin:var(--space-10) 0}.how-to-steps{display:flex;flex-direction:column;gap:var(--space-4);margin-top:var(--space-4)}.how-to-step{display:flex;gap:var(--space-4);align-items:flex-start}.step-number{width:28px;height:28px;border-radius:var(--radius-full);background:var(--color-accent-light);color:var(--color-accent);font-size:var(--text-sm);font-weight:var(--font-semibold);display:flex;align-items:center;justify-content:center;flex-shrink:0;margin-top:2px}.step-title{font-size:var(--text-base);font-weight:var(--font-medium);color:var(--color-text-primary);margin-bottom:var(--space-1)}.step-desc{font-size:var(--text-sm);color:var(--color-text-secondary);line-height:1.5}.faq-list{display:flex;flex-direction:column;gap:var(--space-1);margin-top:var(--space-4)}.faq-item{border:1px solid var(--color-border);border-radius:var(--radius-md);overflow:hidden}.faq-question{width:100%;display:flex;align-items:center;justify-content:space-between;padding:var(--space-4) var(--space-5);font-size:var(--text-base);font-weight:var(--font-medium);color:var(--color-text-primary);background:var(--color-bg);border:none;cursor:pointer;text-align:left;gap:var(--space-4);transition:background var(--transition-fast)}.faq-question:hover{background:var(--color-bg-secondary)}.faq-question[aria-expanded="true"]{background:var(--color-bg-secondary)}.faq-icon{width:20px;height:20px;flex-shrink:0;transition:transform var(--transition-normal);color:var(--color-text-muted)}.faq-question[aria-expanded="true"] .faq-icon{transform:rotate(180deg)}.faq-answer{display:none;padding:0 var(--space-5) var(--space-4);font-size:var(--text-sm);color:var(--color-text-secondary);line-height:1.7;border-top:1px solid var(--color-border)}.faq-answer.open{display:block}.about-section{background:var(--color-bg-secondary);border-radius:var(--radius-lg);padding:var(--space-8);margin-top:var(--space-8)}.about-section p{font-size:var(--text-base);color:var(--color-text-secondary);line-height:1.7;margin-bottom:var(--space-4)}.about-section p:last-child{margin-bottom:0}.formula-block{background:var(--color-bg-tertiary);border:1px solid var(--color-border);border-left:3px solid var(--color-accent);border-radius:0 var(--radius-md) var(--radius-md) 0;padding:var(--space-4) var(--space-5);font-family:var(--font-mono);font-size:var(--text-sm);color:var(--color-text-primary);margin:var(--space-4) 0;overflow-x:auto}.related-section{margin-top:var(--space-10)}.related-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:var(--space-3);margin-top:var(--space-4)}.related-card{display:flex;flex-direction:column;padding:var(--space-4);background:var(--color-bg);border:1px solid var(--color-border);border-radius:var(--radius-lg);text-decoration:none;transition:color var(--transition-fast),background-color var(--transition-fast),border-color var(--transition-fast),box-shadow 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