@font-face{font-family:Inter Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(/_astro/inter-cyrillic-ext-wght-normal.BOeWTOD4.woff2)format("woff2-variations");unicode-range:U+460-52F,U+1C80-1C8A,U+20B4,U+2DE0-2DFF,U+A640-A69F,U+FE2E-FE2F}@font-face{font-family:Inter Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(/_astro/inter-cyrillic-wght-normal.DqGufNeO.woff2)format("woff2-variations");unicode-range:U+301,U+400-45F,U+490-491,U+4B0-4B1,U+2116}@font-face{font-family:Inter Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(/_astro/inter-greek-ext-wght-normal.DlzME5K_.woff2)format("woff2-variations");unicode-range:U+1F??}@font-face{font-family:Inter Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(/_astro/inter-greek-wght-normal.CkhJZR-_.woff2)format("woff2-variations");unicode-range:U+370-377,U+37A-37F,U+384-38A,U+38C,U+38E-3A1,U+3A3-3FF}@font-face{font-family:Inter Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(/_astro/inter-vietnamese-wght-normal.CBcvBZtf.woff2)format("woff2-variations");unicode-range:U+102-103,U+110-111,U+128-129,U+168-169,U+1A0-1A1,U+1AF-1B0,U+300-301,U+303-304,U+308-309,U+323,U+329,U+1EA0-1EF9,U+20AB}@font-face{font-family:Inter Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(/_astro/inter-latin-ext-wght-normal.DO1Apj_S.woff2)format("woff2-variations");unicode-range:U+100-2BA,U+2BD-2C5,U+2C7-2CC,U+2CE-2D7,U+2DD-2FF,U+304,U+308,U+329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}@font-face{font-family:Inter Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(/_astro/inter-latin-wght-normal.Dx4kXJAl.woff2)format("woff2-variations");unicode-range:U+??,U+131,U+152-153,U+2BB-2BC,U+2C6,U+2DA,U+2DC,U+304,U+308,U+329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}@font-face{font-family:Inter Fallback;src:local(Arial);ascent-override:90.2%;descent-override:22.48%;line-gap-override:0%;size-adjust:107.4%}:root{--bg:#f6f5f1;--surface:#fff;--surface-2:#efeee8;--border:#dddcd3;--border-input:#83838a;--text:#16181d;--text-muted:#565a64;--accent:#2438c9;--accent-hover:#1a2ba3;--accent-soft:#e7e9fb;--on-accent:#fff;--mark:#c8401a;--success:#17693f;--danger:#b3261e;--shadow:0 1px 2px #16181d0d, 0 2px 8px #16181d0d;--shadow-pop:0 12px 32px #16181d2e;--radius-sm:6px;--radius:10px;--radius-lg:14px;--font:"Inter Variable", "Inter Fallback", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;--fast:.12s;--ease:cubic-bezier(.2, .8, .2, 1);color-scheme:light}:root[data-theme=dark]{--bg:#101216;--surface:#181b21;--surface-2:#21252c;--border:#2f343d;--border-input:#7d8390;--text:#eceef2;--text-muted:#a8aeba;--accent:#9daaff;--accent-hover:#b9c2ff;--accent-soft:#252b4d;--on-accent:#101216;--mark:#ff8d66;--success:#6bd39a;--danger:#ff8a80;--shadow:0 1px 2px #0000004d, 0 2px 8px #00000040;--shadow-pop:0 12px 32px #00000080;color-scheme:dark}*,:before,:after{box-sizing:border-box}html{-webkit-text-size-adjust:100%;scroll-padding-top:16px}body{background:var(--bg);color:var(--text);font:400 16px/1.6 var(--font);overflow-wrap:break-word;margin:0}h1,h2,h3{letter-spacing:-.015em;margin:0;line-height:1.2}h1{text-wrap:balance;font-size:clamp(1.625rem,1.3rem + 1.4vw,2.25rem);font-weight:700}h2{margin-top:2.25rem;margin-bottom:.75rem;font-size:1.3rem;font-weight:650}h3{margin-top:1.5rem;margin-bottom:.5rem;font-size:1.05rem;font-weight:600}p{margin:0 0 1em}a{color:var(--accent);text-underline-offset:2px;text-decoration-thickness:1px}a:hover{color:var(--accent-hover);text-decoration-thickness:2px}:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:3px}.skip-link{z-index:50;background:var(--accent);color:var(--on-accent);border-radius:var(--radius-sm);padding:8px 14px;font-weight:600;position:absolute;top:-60px;left:12px}.skip-link:focus{color:var(--on-accent);top:8px}.sr-only{clip-path:inset(50%);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.site-header{background:var(--surface);position:relative}.site-header:after{content:"";border-top:1px solid var(--border);background-image:linear-gradient(to right, var(--mark) 1px, transparent 1px), linear-gradient(to right, var(--border-input) 1px, transparent 1px);background-position:0 0;background-repeat:repeat-x;background-size:60px 9px,12px 5px;height:9px;display:block}.header-inner{flex-wrap:wrap;align-items:center;gap:14px;max-width:1200px;margin:0 auto;padding:10px 16px;display:flex}.logo{color:var(--text);letter-spacing:-.03em;align-items:center;gap:9px;font-size:1.25rem;font-weight:750;text-decoration:none;display:inline-flex}.logo:hover{color:var(--text)}.logo b{color:var(--accent);font-weight:750}.logo svg{flex:none}.header-search{flex:280px;order:3;min-width:0}.header-actions{order:2;gap:6px;margin-left:auto;display:flex}@media (width>=760px){.header-search{order:2;max-width:520px;margin:0 auto}.header-actions{order:3;margin-left:0}}.icon-btn{border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--surface);width:44px;height:44px;color:var(--text);cursor:pointer;transition:background var(--fast) var(--ease), border-color var(--fast) var(--ease);place-items:center;display:inline-grid}.icon-btn:hover{background:var(--surface-2);border-color:var(--border-input)}.icon-btn[aria-pressed=true]{color:var(--mark);border-color:var(--mark)}.icon-btn svg{width:20px;height:20px}[data-theme=dark] .icon-sun{display:block}[data-theme=dark] .icon-moon,.icon-sun{display:none}.quick-nav{max-width:1200px;margin:0 auto;padding:0 16px}.quick-nav ul{scrollbar-width:none;gap:4px;margin:0;padding:0 0 8px;list-style:none;display:flex;overflow-x:auto}.quick-nav ul::-webkit-scrollbar{display:none}.quick-nav a{white-space:nowrap;min-height:36px;color:var(--text);border-radius:var(--radius-sm);align-items:center;padding:0 10px;font-size:.875rem;font-weight:550;text-decoration:none;display:inline-flex}.quick-nav a:hover{background:var(--surface-2);color:var(--text)}.search-box{position:relative}.search-box input{background:var(--surface-2);width:100%;height:44px;color:var(--text);border:1px solid var(--border);border-radius:var(--radius);font:inherit;padding:0 44px 0 40px}.search-box input::placeholder{color:var(--text-muted);opacity:1}.search-box input:focus{background:var(--surface);border-color:var(--accent);outline:2px solid var(--accent);outline-offset:0}.search-box .icon-search{width:20px;height:20px;color:var(--text-muted);pointer-events:none;position:absolute;top:12px;left:12px}.search-box kbd{font:500 12px/20px var(--font);color:var(--text-muted);border:1px solid var(--border);background:var(--surface);border-radius:4px;padding:0 7px;position:absolute;top:11px;right:10px}.search-box input:focus~kbd{display:none}@media (hover:none){.search-box kbd{display:none}}.suggestions{z-index:30;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);max-height:60vh;box-shadow:var(--shadow-pop);margin:0;padding:6px;list-style:none;position:absolute;top:calc(100% + 6px);left:0;right:0;overflow-y:auto}.suggestions[hidden]{display:none}.suggestions li{border-radius:var(--radius-sm);cursor:pointer;justify-content:space-between;align-items:baseline;gap:12px;padding:9px 10px;display:flex}.suggestions li[aria-selected=true],.suggestions li:hover{background:var(--accent-soft)}.suggestions .s-main{min-width:0;font-weight:550}.suggestions .s-sub{color:var(--text-muted);text-align:right;flex:none;max-width:45%;font-size:.8125rem}.suggestions .s-answer{color:var(--accent);font-weight:650}.suggestions .s-empty{cursor:default;color:var(--text-muted)}.suggestions .s-empty:hover{background:0 0}.layout{grid-template-columns:minmax(0,1fr);gap:28px;max-width:1200px;margin:0 auto;padding:20px 16px 48px;display:grid}@media (width>=1024px){.layout{grid-template-columns:minmax(0,1fr) 320px;padding-top:26px}}.layout--single{max-width:780px;display:block}main{min-width:0}main>section:not(.card),main>.faq{content-visibility:auto;contain-intrinsic-size:auto 500px}.breadcrumb{color:var(--text-muted);margin-bottom:12px;font-size:.8125rem}.breadcrumb ol{flex-wrap:wrap;gap:4px;margin:0;padding:0;list-style:none;display:flex}.breadcrumb li+li:before{content:"/";color:var(--text-muted);margin-right:4px}.lead{color:var(--text-muted);max-width:62ch;margin:8px 0 18px;font-size:1.0625rem}.prose{max-width:70ch}.prose ul,.prose ol{margin:0 0 1em;padding-left:1.25rem}.prose li{margin-bottom:.35em}.prose table{margin-bottom:1.25em}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow)}.converter{padding:16px}@media (width>=640px){.converter{padding:20px}}.tabs{scrollbar-width:none;gap:4px;margin-bottom:14px;padding:2px;display:flex;overflow-x:auto}.tabs::-webkit-scrollbar{display:none}.tab{border-radius:var(--radius-sm);min-height:40px;color:var(--text-muted);font:550 .9375rem var(--font);cursor:pointer;transition:background var(--fast) var(--ease), color var(--fast) var(--ease);background:0 0;border:1px solid #0000;flex:none;padding:0 14px}.tab:hover{background:var(--surface-2);color:var(--text)}.tab[aria-selected=true]{background:var(--accent);color:var(--on-accent)}.cv-grid{grid-template-columns:minmax(0,1fr);align-items:start;gap:10px;display:grid}@media (width>=640px){.cv-grid{grid-template-columns:minmax(0,1fr) 44px minmax(0,1fr);gap:12px}}.cv-col{gap:8px;min-width:0;display:grid}.cv-label{justify-content:space-between;align-items:baseline;gap:8px;font-size:.875rem;font-weight:600;display:flex}.cv-unit-name{color:var(--text-muted);text-align:right;text-overflow:ellipsis;white-space:nowrap;min-width:0;font-weight:500;overflow:hidden}.cv-input{background:var(--surface);width:100%;height:56px;color:var(--text);border:1px solid var(--border-input);border-radius:var(--radius);font:600 1.375rem var(--font);font-variant-numeric:tabular-nums;padding:0 14px}.cv-input:focus{border-color:var(--accent);outline:2px solid var(--accent);outline-offset:0}.cv-input.is-invalid{border-color:var(--danger);outline-color:var(--danger)}.cv-input.is-result{background:var(--accent-soft)}.cv-input::placeholder{color:var(--text-muted);opacity:1;font-size:1rem;font-weight:400}.cv-filter{width:100%;height:38px;font:inherit;background:var(--surface-2);color:var(--text);border:1px solid var(--border);border-radius:var(--radius-sm);padding:0 10px;font-size:.875rem}.cv-filter::placeholder{color:var(--text-muted);opacity:1}.cv-select{width:100%;font:inherit;background:var(--surface);color:var(--text);border:1px solid var(--border-input);border-radius:var(--radius-sm);padding:6px;font-size:.9375rem}@media (width<=639px){.cv-select{height:44px}.cv-filter:not(.all-units-filter){display:none}}.cv-select option{border-radius:4px;padding:5px 7px}.cv-select option:checked{background:var(--accent-soft);color:var(--text)}.swap-btn{background:var(--surface);width:44px;height:44px;color:var(--accent);border:1px solid var(--border-input);cursor:pointer;transition:transform .18s var(--ease), background var(--fast) var(--ease);border-radius:50%;justify-self:center;place-items:center;text-decoration:none;display:grid}.swap-btn:hover{background:var(--accent-soft);color:var(--accent)}.swap-btn:active{transform:rotate(180deg)}.swap-btn svg{width:20px;height:20px}@media (width>=640px){.swap-col{padding-top:26px}.swap-btn svg{transform:rotate(90deg)}}.cv-error{color:var(--danger);min-height:1.3em;margin:0;font-size:.875rem}.cv-hint{color:var(--text-muted);margin:2px 0 0;font-size:.8125rem}.result{border-radius:var(--radius);background:var(--surface-2);flex-wrap:wrap;align-items:baseline;gap:4px 10px;min-height:52px;margin-top:14px;padding:12px 14px;font-size:1.0625rem;font-weight:600;display:flex}.result small{width:100%;color:var(--text-muted);font-size:.875rem;font-weight:400;display:block}.cv-tools{flex-wrap:wrap;align-items:center;gap:8px;margin-top:12px;display:flex}.btn{border-radius:var(--radius-sm);border:1px solid var(--border-input);background:var(--surface);min-height:44px;color:var(--text);font:550 .875rem var(--font);cursor:pointer;transition:background var(--fast) var(--ease), border-color var(--fast) var(--ease);justify-content:center;align-items:center;gap:7px;padding:0 14px;text-decoration:none;display:inline-flex}.btn:hover{background:var(--surface-2);color:var(--text)}.btn svg{flex:none;width:16px;height:16px}.btn--primary{background:var(--accent);border-color:var(--accent);color:var(--on-accent)}.btn--primary:hover{background:var(--accent-hover);border-color:var(--accent-hover);color:var(--on-accent)}.btn[aria-pressed=true]{color:var(--mark);border-color:var(--mark)}.cv-precision{color:var(--text-muted);align-items:center;gap:7px;margin-left:auto;font-size:.875rem;display:inline-flex}.cv-precision select{height:44px;font:inherit;background:var(--surface);color:var(--text);border:1px solid var(--border-input);border-radius:var(--radius-sm);padding:0 8px}.all-units{border-top:1px solid var(--border);margin-top:16px;padding-top:4px}.all-units summary{cursor:pointer;min-height:44px;padding:10px 0;font-weight:600;list-style-position:inside}.all-units-filter{margin-bottom:8px}.table-scroll{-webkit-overflow-scrolling:touch;overflow-x:auto}.all-units .table-scroll{border:1px solid var(--border);border-radius:var(--radius-sm);max-height:380px;overflow-y:auto}table{border-collapse:collapse;width:100%;font-size:.9375rem}th,td{text-align:left;border-bottom:1px solid var(--border);vertical-align:top;padding:8px 12px}th{background:var(--surface-2);font-weight:600}tbody tr:last-child td{border-bottom:0}td a{min-height:24px;line-height:24px;display:inline-block}td.num,th.num{text-align:right;font-variant-numeric:tabular-nums;white-space:nowrap}.table-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden}.link-grid{grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:2px 18px;margin:0;padding:0;list-style:none;display:grid}.link-grid a{padding:6px 0;line-height:1.35;display:block}.home-popular{columns:2;column-gap:18px;margin:0;padding:0;list-style:none}.home-popular li{break-inside:avoid}.home-popular a{padding:6px 0;line-height:1.35;display:block}@media (width<=420px){.home-popular{columns:1}}.group-card{margin-bottom:14px;padding:16px 18px}.group-card h3{margin-top:0;margin-bottom:8px}.group-card h3 a{color:var(--text);text-decoration:none}.group-card h3 a:hover{color:var(--accent);text-decoration:underline}.sidebar{flex-direction:column;gap:22px;min-width:0;display:flex}.nav-card{overflow:hidden}.nav-card h2{border-bottom:1px solid var(--border);margin:0;padding:12px 16px;font-size:1rem}.nav-card details{border-bottom:1px solid var(--border)}.nav-card details:last-of-type{border-bottom:0}.nav-card summary{cursor:pointer;justify-content:space-between;align-items:center;gap:8px;min-height:44px;padding:11px 16px;font-size:.9375rem;font-weight:600;list-style:none;display:flex}.nav-card summary::-webkit-details-marker{display:none}.nav-card summary:after{content:"";border-right:2px solid var(--text-muted);border-bottom:2px solid var(--text-muted);width:8px;height:8px;transition:transform var(--fast) var(--ease);flex:none;margin-right:4px;transform:rotate(45deg)}.nav-card details[open] summary:after{transform:rotate(-135deg)}.nav-card summary:hover{background:var(--surface-2)}.nav-card ul{grid-template-columns:1fr 1fr;gap:0 4px;margin:0;padding:2px 8px 10px;list-style:none;display:grid}.nav-card ul a{border-radius:4px;padding:6px 8px;font-size:.875rem;line-height:1.3;text-decoration:none;display:block}.nav-card ul a:hover{background:var(--accent-soft)}.nav-card ul a[aria-current=page]{background:var(--accent);color:var(--on-accent)}.nav-card .nav-extra{border-top:1px solid var(--border);padding:11px 16px;font-size:.9375rem;font-weight:600;text-decoration:none;display:block}.nav-card .nav-extra:hover{background:var(--surface-2)}.ad{text-align:center;min-width:0;display:block}.ad__label{letter-spacing:.04em;color:var(--text-muted);margin-bottom:4px;font-size:.6875rem;display:block}.ad ins{display:block}.ad--sidebar{min-height:274px}.ad--content{min-height:124px;margin:32px 0}.ad--bottom{min-height:124px;margin:32px 0 0}.ad--sidebar{display:none}@media (width>=1024px){.ad--sidebar{display:block}}.ad:has(ins[data-ad-status=unfilled]){display:none}.ad__placeholder{border:1px dashed var(--border-input);border-radius:var(--radius-sm);background:var(--surface-2);min-height:250px;color:var(--text-muted);place-items:center;padding:12px;font-size:.8125rem;display:grid}.ad--content .ad__placeholder,.ad--bottom .ad__placeholder{min-height:100px}.recent{margin-top:16px}.recent[hidden]{display:none}.chips{flex-wrap:wrap;gap:6px;margin:8px 0 0;padding:0;list-style:none;display:flex}.chips a{background:var(--surface-2);min-height:36px;color:var(--text);border-radius:999px;align-items:center;padding:0 12px;font-size:.875rem;text-decoration:none;display:inline-flex}.chips a:hover{background:var(--accent-soft);color:var(--text)}.find-form{margin-top:18px;padding:18px}.find-form h2{margin-top:0}.find-grid{grid-template-columns:minmax(0,1fr);gap:12px;display:grid}@media (width>=560px){.find-grid{grid-template-columns:1fr 1fr}}.find-grid label{margin-bottom:4px;font-size:.875rem;font-weight:600;display:block}.find-grid .search-box input{padding-left:12px;padding-right:12px}.formula{background:var(--surface-2);border-radius:var(--radius-sm);margin:0 0 1em;padding:12px 14px;font-weight:600;overflow-x:auto}.faq details{border-bottom:1px solid var(--border)}.faq summary{cursor:pointer;min-height:44px;padding:12px 0;font-weight:600}.faq details p{color:var(--text-muted)}.case-area{resize:vertical;width:100%;min-height:220px;font:inherit;background:var(--surface);color:var(--text);border:1px solid var(--border-input);border-radius:var(--radius);padding:12px 14px}.case-area:focus{border-color:var(--accent);outline:2px solid var(--accent);outline-offset:0}.btn-row{flex-wrap:wrap;gap:8px;margin:12px 0;display:flex}.stats{color:var(--text-muted);flex-wrap:wrap;gap:6px 18px;margin:0;font-size:.875rem;display:flex}.stats b{color:var(--text);font-weight:650}.rate-note{color:var(--text-muted);margin:12px 0 0;font-size:.8125rem}.toast{z-index:60;background:var(--text);color:var(--bg);border-radius:var(--radius-sm);box-shadow:var(--shadow-pop);padding:10px 16px;font-size:.875rem;font-weight:550;position:fixed;bottom:20px;left:50%;transform:translate(-50%)}.toast[hidden]{display:none}.calc{border:1px solid var(--border);border-radius:var(--radius-lg);color:var(--text);background:var(--surface);box-shadow:var(--shadow-pop);width:min(380px,100vw - 24px);padding:0}.calc::backdrop{background:#0a0c1073}.calc-head{border-bottom:1px solid var(--border);justify-content:space-between;align-items:center;padding:10px 10px 10px 16px;display:flex}.calc-head h2{margin:0;font-size:1rem}.calc-body{padding:12px}.calc-expr{width:100%;height:48px;font:500 1.0625rem var(--font);text-align:right;background:var(--surface-2);color:var(--text);border:1px solid var(--border);border-radius:var(--radius-sm);padding:0 10px}.calc-out{text-align:right;min-height:34px;margin:6px 2px 8px;font-size:1.25rem;font-weight:700;overflow-x:auto}.calc-keys{grid-template-columns:repeat(5,1fr);gap:5px;display:grid}.calc-keys button{min-height:44px;font:550 .9375rem var(--font);border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--surface);color:var(--text);cursor:pointer;padding:0}.calc-keys button:hover{background:var(--surface-2)}.calc-keys button.fn{background:var(--surface-2);font-size:.8125rem}.calc-keys button.fn:hover{background:var(--border)}.calc-keys button.eq{background:var(--accent);color:var(--on-accent);border-color:var(--accent)}.calc-keys button.eq:hover{background:var(--accent-hover)}.calc-foot{gap:8px;margin-top:8px;display:flex}.calc-foot .btn{flex:1}.site-footer{background:var(--surface);border-top:1px solid var(--border);font-size:.875rem}.footer-inner{gap:16px;max-width:1200px;margin:0 auto;padding:24px 16px;display:grid}.footer-links{flex-wrap:wrap;gap:4px 16px;margin:0;padding:0;list-style:none;display:flex}.footer-links a,.footer-links button{color:var(--text-muted);min-height:32px;font:inherit;cursor:pointer;text-underline-offset:2px;background:0 0;border:0;align-items:center;padding:0;text-decoration:underline;display:inline-flex}.footer-links a:hover,.footer-links button:hover{color:var(--text)}.footer-note{color:var(--text-muted);margin:0}@media (prefers-reduced-motion:reduce){*,:before,:after{transition-duration:.01ms!important;animation-duration:.01ms!important}}@media print{.site-header,.sidebar,.ad,.site-footer,.cv-tools,.calc{display:none!important}body{background:#fff}}