.site-header[data-astro-cid-ctg3m53h]{position:sticky;top:0;z-index:50;background:#ffffffeb;backdrop-filter:saturate(160%) blur(8px);border-bottom:1px solid var(--c-line)}.header-inner[data-astro-cid-ctg3m53h]{display:flex;align-items:center;gap:18px;height:var(--header-h)}.brand[data-astro-cid-ctg3m53h]{display:inline-flex;align-items:center;gap:10px;text-decoration:none;color:var(--c-ink);font-weight:750}.brand-mark[data-astro-cid-ctg3m53h]{display:inline-grid;place-items:center;width:38px;height:38px;border-radius:10px;background:var(--c-brand);color:#fff;font-weight:800;font-size:.82rem;letter-spacing:.02em}.brand-name[data-astro-cid-ctg3m53h]{font-size:1.02rem;letter-spacing:-.01em;white-space:nowrap}.primary-nav[data-astro-cid-ctg3m53h]{margin-left:auto}.primary-nav[data-astro-cid-ctg3m53h]>ul[data-astro-cid-ctg3m53h]{display:flex;gap:4px;list-style:none;margin:0;padding:0}.primary-nav[data-astro-cid-ctg3m53h]>ul[data-astro-cid-ctg3m53h]>li[data-astro-cid-ctg3m53h]{position:relative}.primary-nav[data-astro-cid-ctg3m53h] a[data-astro-cid-ctg3m53h]{display:inline-block;padding:9px 12px;border-radius:var(--r-sm);text-decoration:none;color:var(--c-ink-soft);font-weight:600;font-size:.95rem;white-space:nowrap}.primary-nav[data-astro-cid-ctg3m53h] a[data-astro-cid-ctg3m53h]:hover,.primary-nav[data-astro-cid-ctg3m53h] a[data-astro-cid-ctg3m53h][aria-current=page]{background:var(--c-brand-l);color:var(--c-brand-d)}.dropdown[data-astro-cid-ctg3m53h]{position:absolute;top:calc(100% + 6px);left:0;min-width:270px;background:#fff;border:1px solid var(--c-line);border-radius:var(--r-md);box-shadow:var(--shadow-lg);padding:8px;opacity:0;visibility:hidden;transform:translateY(6px);transition:opacity .14s ease,transform .14s ease,visibility .14s}.has-children[data-astro-cid-ctg3m53h]:hover .dropdown[data-astro-cid-ctg3m53h],.has-children[data-astro-cid-ctg3m53h]:focus-within .dropdown[data-astro-cid-ctg3m53h]{opacity:1;visibility:visible;transform:translateY(0)}.dropdown[data-astro-cid-ctg3m53h] ul[data-astro-cid-ctg3m53h]{list-style:none;margin:0;padding:0}.dropdown[data-astro-cid-ctg3m53h] a[data-astro-cid-ctg3m53h]{display:block;padding:9px 12px;font-size:.92rem}.nav-toggle[data-astro-cid-ctg3m53h]{display:none;margin-left:auto;width:44px;height:44px;align-items:center;justify-content:center;background:transparent;border:1px solid var(--c-line);border-radius:var(--r-sm);cursor:pointer}.bars[data-astro-cid-ctg3m53h]{position:relative;width:22px;height:16px;display:block}.bars[data-astro-cid-ctg3m53h] span[data-astro-cid-ctg3m53h]{position:absolute;left:0;width:100%;height:2.5px;border-radius:2px;background:var(--c-ink);transition:transform .2s ease,opacity .2s ease,top .2s ease}.bars[data-astro-cid-ctg3m53h] span[data-astro-cid-ctg3m53h]:nth-child(1){top:0}.bars[data-astro-cid-ctg3m53h] span[data-astro-cid-ctg3m53h]:nth-child(2){top:7px}.bars[data-astro-cid-ctg3m53h] span[data-astro-cid-ctg3m53h]:nth-child(3){top:14px}.nav-toggle[data-astro-cid-ctg3m53h][aria-expanded=true] .bars[data-astro-cid-ctg3m53h] span[data-astro-cid-ctg3m53h]:nth-child(1){top:7px;transform:rotate(45deg)}.nav-toggle[data-astro-cid-ctg3m53h][aria-expanded=true] .bars[data-astro-cid-ctg3m53h] span[data-astro-cid-ctg3m53h]:nth-child(2){opacity:0}.nav-toggle[data-astro-cid-ctg3m53h][aria-expanded=true] .bars[data-astro-cid-ctg3m53h] span[data-astro-cid-ctg3m53h]:nth-child(3){top:7px;transform:rotate(-45deg)}.drawer-backdrop[data-astro-cid-ctg3m53h]{position:fixed;inset:var(--header-h) 0 0 0;z-index:40;background:#0f1b2d6b;opacity:0;transition:opacity .2s ease}.drawer-backdrop[data-astro-cid-ctg3m53h].open{opacity:1}.mobile-drawer[data-astro-cid-ctg3m53h]{position:fixed;top:var(--header-h);right:0;z-index:45;width:min(86vw,360px);height:calc(100dvh - var(--header-h));background:#fff;border-left:1px solid var(--c-line);box-shadow:var(--shadow-lg);overflow-y:auto;padding:14px 14px 40px;transform:translate(100%);transition:transform .24s ease}.mobile-drawer[data-astro-cid-ctg3m53h].open{transform:translate(0)}.mobile-drawer[data-astro-cid-ctg3m53h]>ul[data-astro-cid-ctg3m53h]{list-style:none;margin:0;padding:0}.mobile-drawer[data-astro-cid-ctg3m53h]>ul[data-astro-cid-ctg3m53h]>li[data-astro-cid-ctg3m53h]{border-bottom:1px solid var(--c-line)}.mobile-drawer[data-astro-cid-ctg3m53h] a[data-astro-cid-ctg3m53h]{display:block;padding:13px 10px;text-decoration:none;color:var(--c-ink);font-weight:650;min-height:46px}.mobile-drawer[data-astro-cid-ctg3m53h] a[data-astro-cid-ctg3m53h]:hover,.mobile-drawer[data-astro-cid-ctg3m53h] a[data-astro-cid-ctg3m53h][aria-current=page]{color:var(--c-brand-d)}.mobile-drawer[data-astro-cid-ctg3m53h] .sub[data-astro-cid-ctg3m53h]{list-style:none;margin:0 0 8px;padding:0 0 0 12px}.mobile-drawer[data-astro-cid-ctg3m53h] .sub[data-astro-cid-ctg3m53h] a[data-astro-cid-ctg3m53h]{padding:10px;font-weight:500;font-size:.94rem;color:var(--c-ink-soft);min-height:44px}@media (max-width: 920px){.primary-nav[data-astro-cid-ctg3m53h]{display:none}.nav-toggle[data-astro-cid-ctg3m53h]{display:inline-flex}}.site-footer[data-astro-cid-gcn2mc3v]{background:var(--c-ink);color:#c7d2de;margin-top:64px}.foot-grid[data-astro-cid-gcn2mc3v]{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:32px;padding-block:48px 28px}.foot-brand[data-astro-cid-gcn2mc3v] .brand[data-astro-cid-gcn2mc3v]{color:#fff;text-decoration:none;display:inline-flex;align-items:center;gap:10px;font-weight:750;margin-bottom:12px}.foot-brand[data-astro-cid-gcn2mc3v] .brand-mark[data-astro-cid-gcn2mc3v]{display:inline-grid;place-items:center;width:34px;height:34px;border-radius:9px;background:var(--c-brand);color:#fff;font-weight:800;font-size:.78rem}.foot-brand[data-astro-cid-gcn2mc3v] .muted[data-astro-cid-gcn2mc3v]{color:#97a6b8;max-width:38ch;font-size:.92rem}.foot-h[data-astro-cid-gcn2mc3v]{font-size:.82rem;text-transform:uppercase;letter-spacing:.07em;color:#fff;margin:0 0 12px}.site-footer[data-astro-cid-gcn2mc3v] ul[data-astro-cid-gcn2mc3v]{list-style:none;margin:0;padding:0}.site-footer[data-astro-cid-gcn2mc3v] li[data-astro-cid-gcn2mc3v]{margin:.45em 0}.site-footer[data-astro-cid-gcn2mc3v] a[data-astro-cid-gcn2mc3v]{color:#c7d2de;text-decoration:none;font-size:.93rem}.site-footer[data-astro-cid-gcn2mc3v] a[data-astro-cid-gcn2mc3v]:hover{color:#fff;text-decoration:underline}.foot-bottom[data-astro-cid-gcn2mc3v]{border-top:1px solid rgba(255,255,255,.12);padding-block:18px 26px}.foot-bottom[data-astro-cid-gcn2mc3v] .muted[data-astro-cid-gcn2mc3v]{color:#8295a8;font-size:.84rem;margin:0}@media (max-width: 880px){.foot-grid[data-astro-cid-gcn2mc3v]{grid-template-columns:1fr 1fr;gap:26px}}@media (max-width: 520px){.foot-grid[data-astro-cid-gcn2mc3v]{grid-template-columns:1fr}}:root{--c-ink: #0f1b2d;--c-ink-soft: #33445c;--c-muted: #5d6b7e;--c-line: #e3e8ef;--c-bg: #ffffff;--c-bg-soft: #f5f8fb;--c-bg-sink: #eef3f8;--c-brand: #0a6b6e;--c-brand-d: #075457;--c-brand-l: #e6f2f2;--c-accent: #f4811f;--c-accent-d: #d96d10;--c-good: #1f9d57;--c-bad: #c8412b;--c-white: #fff;--r-sm: 8px;--r-md: 12px;--r-lg: 18px;--shadow-sm: 0 1px 2px rgba(15, 27, 45, .06), 0 1px 3px rgba(15, 27, 45, .08);--shadow-md: 0 6px 18px rgba(15, 27, 45, .08);--shadow-lg: 0 18px 48px rgba(15, 27, 45, .12);--font: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;--font-num: ui-monospace, "SF Mono", "Cascadia Mono", Menlo, Consolas, monospace;--maxw: 1120px;--maxw-narrow: 760px;--header-h: 64px}*,*:before,*:after{box-sizing:border-box}*{margin:0}html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}@media (prefers-reduced-motion: reduce){html{scroll-behavior:auto}}body{font-family:var(--font);color:var(--c-ink);background:var(--c-bg);line-height:1.65;font-size:17px;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}img,picture,svg,canvas{display:block;max-width:100%;height:auto}a{color:var(--c-brand-d);text-decoration:underline;text-underline-offset:2px}a:hover{color:var(--c-accent-d)}h1,h2,h3,h4{line-height:1.18;font-weight:750;color:var(--c-ink);letter-spacing:-.01em}h1{font-size:clamp(1.85rem,1.2rem + 2.6vw,2.85rem)}h2{font-size:clamp(1.4rem,1.05rem + 1.5vw,1.95rem);margin-top:1.6em}h3{font-size:1.22rem;margin-top:1.4em}p{margin:0 0 1rem}ul,ol{margin:0 0 1rem;padding-left:1.3em}li{margin:.3em 0}strong{font-weight:680}.wrap{width:100%;max-width:var(--maxw);margin-inline:auto;padding-inline:clamp(16px,4vw,28px)}.narrow{max-width:var(--maxw-narrow)}.section{padding-block:clamp(40px,6vw,72px)}.bg-soft{background:var(--c-bg-soft)}.bg-sink{background:var(--c-bg-sink)}main{min-height:60vh}.skip-nav{position:absolute;left:-999px;top:0;z-index:100;background:var(--c-ink);color:#fff;padding:10px 16px;border-radius:0 0 var(--r-sm) 0}.skip-nav:focus{left:0}:focus-visible{outline:3px solid var(--c-brand);outline-offset:2px;border-radius:4px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5em;font:inherit;font-weight:650;line-height:1;cursor:pointer;padding:13px 22px;border-radius:var(--r-md);border:1.5px solid transparent;text-decoration:none;transition:transform .08s ease,background .15s ease,box-shadow .15s ease;min-height:46px}.btn:active{transform:translateY(1px)}.btn-primary{background:var(--c-accent);color:var(--c-ink);box-shadow:var(--shadow-sm)}.btn-primary:hover{background:var(--c-accent-d);color:var(--c-ink)}.btn-ghost{background:var(--c-white);color:var(--c-brand-d);border-color:var(--c-line)}.btn-ghost:hover{background:var(--c-brand-l);color:var(--c-brand-d)}.btn-lg{padding:16px 28px;font-size:1.06rem}.card{background:var(--c-white);border:1px solid var(--c-line);border-radius:var(--r-lg);box-shadow:var(--shadow-sm);transition:box-shadow .18s ease,transform .18s ease}.card:hover{box-shadow:var(--shadow-md);transform:translateY(-2px)}.grid{display:grid;gap:18px}.grid-2{grid-template-columns:repeat(2,1fr)}.grid-3{grid-template-columns:repeat(3,1fr)}.grid-4{grid-template-columns:repeat(4,1fr)}@media (max-width: 880px){.grid-3,.grid-4{grid-template-columns:repeat(2,1fr)}}@media (max-width: 560px){.grid-2,.grid-3,.grid-4{grid-template-columns:1fr}}.eyebrow{text-transform:uppercase;letter-spacing:.08em;font-size:.78rem;font-weight:700;color:var(--c-brand)}.lede{font-size:1.16rem;color:var(--c-ink-soft)}.muted{color:var(--c-muted)}.center{text-align:center}.breadcrumb{font-size:.86rem;color:var(--c-muted);padding-block:14px}.breadcrumb ol{list-style:none;display:flex;flex-wrap:wrap;gap:.4em;padding:0;margin:0}.breadcrumb li:after{content:"›";margin-left:.5em;color:var(--c-line)}.breadcrumb li:last-child:after{content:""}.breadcrumb a{color:var(--c-muted);text-decoration:none}.breadcrumb a:hover{color:var(--c-brand);text-decoration:underline}.prose{max-width:var(--maxw-narrow)}.prose>*+*{margin-top:1.05rem}.prose h2{border-top:1px solid var(--c-line);padding-top:1.4rem}.prose ul li::marker{color:var(--c-brand)}.prose a{font-weight:600}.prose blockquote{border-left:4px solid var(--c-brand);background:var(--c-brand-l);padding:14px 18px;border-radius:0 var(--r-md) var(--r-md) 0;color:var(--c-ink-soft)}.prose table{width:100%;border-collapse:collapse;font-size:.95rem}.prose th,.prose td{border:1px solid var(--c-line);padding:10px 12px;text-align:left}.prose th{background:var(--c-bg-soft)}.note{background:var(--c-bg-soft);border:1px solid var(--c-line);border-radius:var(--r-md);padding:14px 16px;font-size:.92rem;color:var(--c-ink-soft)}.note strong{color:var(--c-ink)}.calc{background:#fff;border:1px solid var(--c-line);border-radius:var(--r-lg);box-shadow:var(--shadow-md);overflow:clip}.calc-head{display:flex;flex-wrap:wrap;gap:12px;align-items:center;justify-content:space-between;padding:16px 20px;background:var(--c-brand);color:#fff}.calc-head h2,.calc-head .calc-title{margin:0;color:#fff;font-size:1.15rem}.calc-body{padding:20px}.calc-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px 18px}@media (max-width: 560px){.calc-grid{grid-template-columns:1fr}}.field{display:flex;flex-direction:column;gap:6px}.field.full{grid-column:1 / -1}.field label{font-weight:650;font-size:.9rem;color:var(--c-ink)}.field .hint{font-size:.8rem;color:var(--c-muted)}.field input,.field select{font:inherit;padding:11px 12px;border:1.5px solid var(--c-line);border-radius:var(--r-sm);background:#fff;color:var(--c-ink);width:100%;min-height:46px}.field input:focus,.field select:focus{border-color:var(--c-brand);outline:none;box-shadow:0 0 0 3px var(--c-brand-l)}.input-prefix{position:relative}.input-prefix>span{position:absolute;left:12px;top:50%;transform:translateY(-50%);color:var(--c-muted);font-weight:600;pointer-events:none}.input-prefix input{padding-left:28px}.seg{display:inline-flex;border:1.5px solid var(--c-line);border-radius:var(--r-sm);overflow:hidden}.seg button{font:inherit;font-weight:600;font-size:.86rem;padding:8px 12px;background:#fff;border:0;cursor:pointer;color:var(--c-ink-soft);min-height:40px}.seg button[aria-pressed=true]{background:var(--c-brand);color:#fff}.cur-select{display:inline-flex;align-items:center;gap:6px}.cur-select select{font:inherit;font-weight:650;padding:7px 10px;border-radius:var(--r-sm);border:1.5px solid rgba(255,255,255,.5);background:#ffffff24;color:#fff;min-height:40px}.cur-select select option{color:var(--c-ink)}.calc-result{margin-top:18px;padding:20px;border-radius:var(--r-md);background:var(--c-brand-l);border:1px solid var(--c-brand)}.calc-result .big{font-family:var(--font-num);font-size:clamp(1.8rem,1.2rem + 2vw,2.4rem);font-weight:800;color:var(--c-brand-d);line-height:1.1}.calc-result .sub{color:var(--c-ink-soft);font-size:.95rem;margin-top:4px}.result-rows{display:grid;gap:0;margin-top:14px}.result-rows .rr{display:flex;justify-content:space-between;gap:12px;padding:9px 0;border-top:1px dashed rgba(10,107,110,.25);font-size:.94rem}.result-rows .rr b{font-family:var(--font-num)}.result-bars{margin-top:16px;display:grid;gap:8px}.bar{display:grid;grid-template-columns:56px 1fr auto;align-items:center;gap:10px;font-size:.86rem}.bar .track{height:14px;background:#fff;border:1px solid var(--c-brand);border-radius:7px;overflow:hidden}.bar .fill{height:100%;background:var(--c-brand)}.bar .val{font-family:var(--font-num);font-weight:650}