:root{--color-primary: #1f2937;--color-primary-light: #111827;--color-secondary: #4b5563;--color-accent: #0066cc;--color-accent-dark: #004a99;--color-success: #059669;--color-error: #dc2626;--color-warning: #d97706;--color-bg: #ffffff;--color-bg-secondary: #f9fafb;--color-border: #d1d5db;--font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;--font-size-base: 16px;--font-size-large: 20px;--font-size-xl: 24px;--line-height: 1.5;--spacing-xs: 4px;--spacing-sm: 8px;--spacing-md: 16px;--spacing-lg: 24px;--spacing-xl: 32px;--max-width: 1200px;--border-radius: 8px;--transition: all .2s 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var(--color-border);margin-bottom:var(--spacing-xl)}header h1{margin-bottom:var(--spacing-sm)}header .subtitle{color:var(--color-secondary);font-size:var(--font-size-large);margin:0}footer{background-color:var(--color-bg-secondary);padding:var(--spacing-lg);border-top:2px solid var(--color-border);margin-top:var(--spacing-xl);text-align:center;color:var(--color-secondary);font-size:.875rem}.calculator-container{display:flex;flex-direction:column;gap:var(--spacing-lg)}.calculator-section{background-color:var(--color-bg-secondary);padding:var(--spacing-lg);border-radius:var(--border-radius);border:1px solid var(--color-border)}.results{background-color:var(--color-bg);padding:var(--spacing-md);border-radius:var(--border-radius);border:1px solid var(--color-border)}.result-value{font-size:var(--font-size-xl);font-weight:600;color:var(--color-primary-light);margin-bottom:var(--spacing-sm)}.result-unit{font-size:var(--font-size-large);color:var(--color-secondary)}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border-width:0}*:focus-visible{outline:2px solid var(--color-accent);outline-offset:2px}.skip-link{position:absolute;top:-40px;left:0;background-color:var(--color-accent);color:#fff;padding:var(--spacing-sm) var(--spacing-md);text-decoration:none;z-index:100}.skip-link:focus{top:0}@media (max-width: 768px){h1{font-size:2rem}h2{font-size:1.5rem}h3{font-size:1.25rem}main{padding:var(--spacing-md)}header{padding:var(--spacing-md)}footer{padding:var(--spacing-md)}}@media (prefers-reduced-motion: 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var(--color-accent);outline-offset:-2px;box-shadow:none}.tab-button.active{color:var(--color-primary-light);border-bottom-color:var(--color-accent);background-color:transparent}.tab-panels{margin-top:var(--spacing-lg)}.tab-content{display:none;animation:fadeIn .2s ease-in-out}.tab-content.active{display:block}@keyframes fadeIn{0%{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:translateY(0)}}.conversion-form,.function-input,.expression-input{background-color:var(--color-bg-secondary);padding:var(--spacing-lg);border-radius:var(--border-radius);border:1px solid 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1200px){.calculator-layout{grid-template-columns:repeat(3,1fr);gap:24px;max-width:1400px;margin-left:auto;margin-right:auto}}@media (max-width: 479px){.calculator-layout{gap:12px}.calculator-section{padding:12px}.calculator-section__title{font-size:16px}}@media (min-width: 1601px){.calculator-layout{max-width:1600px}}@media (min-width: 960px) and (orientation: landscape){.calculator-layout{grid-template-columns:repeat(3,1fr);gap:20px}}@media print{.calculator-layout{display:block}.calculator-section{page-break-inside:avoid;margin-bottom:20px}}@media (hover: none) and (pointer: coarse){button,input[type=button],input[type=submit],input[type=reset]{min-height:48px;min-width:48px}input,textarea,select{min-height:48px}}@media (min-device-pixel-ratio: 2),(min-resolution: 192dpi){button:focus,input[type=button]:focus,input[type=submit]:focus,input[type=reset]:focus{outline-width:1px}}@media (prefers-color-scheme: dark){:root{--color-bg: #1a1a1a;--color-bg-secondary: #2d2d2d;--color-border: #404040;--color-primary: #e0e0e0;--color-primary-light: #ffffff;--color-secondary: #b0b0b0}.calculator-section{background-color:var(--color-bg-secondary);border-color:var(--color-border)}}.calculator-section{background-color:var(--color-bg-secondary);border:1px solid var(--color-border);border-radius:var(--border-radius);padding:var(--spacing-md);display:flex;flex-direction:column;gap:var(--spacing-md);transition:var(--transition);box-shadow:0 1px 3px #0000000d}.calculator-section:hover{box-shadow:0 4px 12px #00000014;transform:translateY(-2px)}.calculator-section__title{font-size:18px;font-weight:600;color:var(--color-primary-light);margin:0 0 12px;line-height:1.2}.calculator-section__content{display:flex;flex-direction:column;gap:var(--spacing-md)}.calculator-section__result{min-height:60px;padding:var(--spacing-md);background-color:var(--color-bg);border-radius:calc(var(--border-radius) - 2px);border:1px solid var(--color-border);display:flex;flex-direction:column;justify-content:center}.calculator-section__result:empty{background-color:transparent;border:none;min-height:auto;padding:0}.calculator-section:nth-child(1){--section-bg-color: #f0f7ff;--section-accent-color: #0066cc;--section-accent-light: #e0f0ff}.calculator-section:nth-child(1) .calculator-section__title{color:var(--section-accent-color)}.calculator-section:nth-child(1){background-color:var(--section-bg-color);border-color:var(--section-accent-light)}.calculator-section:nth-child(2){--section-bg-color: #f0fdf4;--section-accent-color: #059669;--section-accent-light: #d0fce0}.calculator-section:nth-child(2) .calculator-section__title{color:var(--section-accent-color)}.calculator-section:nth-child(2){background-color:var(--section-bg-color);border-color:var(--section-accent-light)}.calculator-section:nth-child(3){--section-bg-color: #faf5ff;--section-accent-color: #7c3aed;--section-accent-light: #f3e8ff}.calculator-section:nth-child(3) .calculator-section__title{color:var(--section-accent-color)}.calculator-section:nth-child(3){background-color:var(--section-bg-color);border-color:var(--section-accent-light)}@media (min-width: 768px){.calculator-section{padding:20px}.calculator-section__title{font-size:19px;margin-bottom:14px}}@media (min-width: 1200px){.calculator-section{padding:24px}.calculator-section__title{font-size:20px;margin-bottom:16px}.calculator-section__result{min-height:70px}}@media (max-width: 479px){.calculator-section{padding:12px;gap:12px}.calculator-section__title{font-size:16px;margin-bottom:10px}.calculator-section__content{gap:12px}.calculator-section__result{padding:10px;min-height:50px}}.calculator-section:focus-within{outline:2px solid var(--color-accent);outline-offset:2px}@media (prefers-color-scheme: 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