/* Shared English-article visual language: navy, cyan, one reading column. */
:root{--paper:#1e2d4a;--wash:#263456;--ink:#e2e8f0;--muted:#b6c4d8;--blue:#00d4ff;--teal:#00d4ff;--line:rgba(0,212,255,.18);--measure:"Cascadia Code",Consolas,monospace;color-scheme:dark;font-family:"Rajdhani",-apple-system,BlinkMacSystemFont,"Segoe UI",Arial,sans-serif;font-size:15px;line-height:1.7;color:var(--ink);background:var(--paper)}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0}body::before{content:"";position:fixed;inset:0;background-image:linear-gradient(rgba(0,212,255,.03) 1px,transparent 1px),linear-gradient(90deg,rgba(0,212,255,.03) 1px,transparent 1px);background-size:60px 60px;pointer-events:none;z-index:0}
a{color:var(--blue);text-decoration-thickness:1px;text-underline-offset:3px}a:hover{text-decoration-thickness:2px}a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,[tabindex]:focus-visible{outline:3px solid var(--blue);outline-offset:4px}button,input,select{font:inherit}button,a{-webkit-tap-highlight-color:rgba(0,212,255,.2)}img{display:block;max-width:100%;height:auto}header,main,footer{min-width:0;position:relative}main,.site-footer{z-index:1}
.skip-link{position:fixed;left:16px;top:-120px;padding:10px 18px;border-radius:6px;background:var(--blue);color:#0b1526;z-index:2000}.skip-link:focus{top:12px}
/* Without JS, navigation stays in the document and remains available on mobile. */
.site-top{background:rgba(20,28,43,.96);border-bottom:1px solid var(--line);z-index:1000}.site-top-inner{max-width:1300px;min-height:68px;padding:0 24px;margin:0 auto;display:flex;align-items:center;gap:18px}.brand{color:#fff;font-size:22px;line-height:1.2;font-weight:700;letter-spacing:1px;white-space:nowrap;text-decoration:none}.brand span{color:var(--blue)}.lang-switch{display:flex;align-items:center;flex:0 0 auto;gap:0}.lang-switch a{min-width:36px;min-height:44px;padding:10px 4px;display:inline-flex;align-items:center;justify-content:center;font-size:12px;color:var(--muted);text-decoration:none}.lang-switch a.active,.lang-switch a[aria-current]{color:var(--blue)}
.site-nav{display:flex;align-items:center;justify-content:flex-end;gap:16px;margin-left:auto}.site-nav a{display:inline-flex;align-items:center;min-height:44px;white-space:nowrap;color:var(--muted);font-size:14px;text-decoration:none}.site-nav a:hover,.site-nav a.active,.site-nav a[aria-current]{color:var(--blue)}.menu-toggle{display:none;flex:0 0 44px;min-width:44px;min-height:44px;background:none;border:1px solid transparent;border-radius:6px;padding:9px 10px;cursor:pointer}.menu-toggle span{display:block;width:22px;height:2px;margin:5px 0;background:var(--blue)}.js .site-top{position:fixed;top:0;left:0;right:0;height:68px}.js main{padding-top:68px}.draft-banner{margin:0;padding:10px 24px;text-align:center;background:#fff4d5;color:#644600;font-size:13px}
.masthead{max-width:860px;margin:0 auto;padding:40px 24px 0}.breadcrumb{color:var(--muted);font-size:13px;margin:0 0 20px}.breadcrumb a{text-decoration:none}.eyebrow{color:var(--blue);font-size:12px;letter-spacing:.08em;text-transform:uppercase;margin:0 0 12px}.masthead h1{font-size:30px;font-weight:700;line-height:1.4;letter-spacing:0;margin:0 0 18px}.masthead .standfirst{font-size:16px;line-height:1.7;color:var(--ink);margin:0}.byline{font-size:13px;color:var(--muted);margin:20px 0 0}.layout{max-width:860px;margin:0 auto;padding:24px 24px 60px;display:block}
.toc{position:static;padding:20px 24px;margin:0 0 28px;border:1px solid var(--line);border-radius:14px;background:var(--wash);font-size:14px;line-height:1.7}.toc h2{color:var(--blue);font-size:14px;font-weight:600;margin:0}.toc ol{padding-left:20px;margin:12px 0 0}.toc li{margin:0 0 8px}.toc li:last-child{margin-bottom:0}.toc li::marker{color:var(--blue)}.toc a{color:var(--muted);text-decoration:none}.toc a:hover{color:var(--blue);text-decoration:underline}
article{min-width:0;max-width:100%;scroll-margin-top:96px}article>p:first-child{margin-top:0}article h2{color:var(--blue);font-size:22px;font-weight:600;line-height:1.45;margin:44px 0 16px;padding-left:14px;border-left:3px solid var(--blue);scroll-margin-top:96px}article h3{color:var(--ink);font-size:17px;font-weight:600;line-height:1.5;margin:28px 0 10px;scroll-margin-top:96px}p{color:var(--muted);margin:0 0 16px}article ul,article ol{color:var(--muted);padding-left:22px;margin:0 0 16px}article li{margin-bottom:8px}article li::marker{color:var(--blue)}
figure{background:var(--wash);border:1px solid var(--line);border-radius:14px;padding:12px;margin:24px 0 30px}figure>a{display:block;border-radius:8px}figure img{width:100%;background:#fff;border-radius:8px}figcaption{color:var(--muted);font-size:13px;line-height:1.6;padding:12px 8px 2px}
pre{background:var(--wash);border:1px solid var(--line);border-left:3px solid var(--blue);border-radius:10px;padding:18px 20px;font-family:var(--measure);font-size:13px;line-height:1.8;white-space:pre-wrap;overflow-wrap:anywhere;margin:20px 0 24px}code{font-family:var(--measure);font-size:.88em;color:var(--blue);background:rgba(0,212,255,.1);border-radius:5px;padding:2px 5px}pre code{color:var(--ink);background:none;border-radius:0;padding:0;font-size:inherit}
.table-scroll{max-width:100%;overflow-x:auto;-webkit-overflow-scrolling:touch;background:var(--wash);border:1px solid var(--line);border-radius:12px;margin:20px 0 24px}table{border-collapse:collapse;width:100%;min-width:570px;text-align:left;font-size:14px;line-height:1.6}caption{text-align:left;padding:14px;font-weight:600;color:var(--ink)}th,td{padding:12px 14px;vertical-align:top;border-top:1px solid var(--line);color:var(--muted)}thead th{background:rgba(0,212,255,.1);color:var(--blue);font-weight:600}tbody th{color:var(--ink);font-weight:600}.note{background:rgba(16,185,129,.08);border:1px solid rgba(16,185,129,.35);border-radius:12px;padding:16px 20px;margin:18px 0;color:#b8e5d2;font-size:14px}
.calculator{margin:38px 0;padding:24px;border:1px solid rgba(0,212,255,.4);border-radius:14px;background:var(--wash);box-shadow:0 0 24px rgba(0,212,255,.06);scroll-margin-top:96px}.calculator h2{margin:0 0 14px}.calc-hint{color:var(--muted);font-size:14px;line-height:1.65}.calc-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px;margin:24px 0}.calc-grid label,.preset-label{display:flex;flex-direction:column;gap:6px;min-width:0;color:var(--ink);font-size:13px;font-weight:600}.calc-grid input,.preset-label select{width:100%;min-width:0;min-height:46px;padding:8px 10px;border:1px solid #7186a7;border-radius:7px;color:var(--ink);background:#18243e;font-size:16px}.calc-grid input[aria-invalid="true"]{border-color:#ff959a}.preset-label{max-width:440px}.calc-grid small{font-weight:400;color:var(--muted)}
.primary{display:inline-flex;align-items:center;justify-content:center;min-height:46px;max-width:100%;background:var(--blue);color:#0b1526;border:0;border-radius:30px;padding:11px 26px;font-weight:700;text-align:center;text-decoration:none;cursor:pointer}.primary:hover{background:#33e0ff;text-decoration:none}.calc-error{color:#ffb8bb;background:rgba(239,68,68,.08);border-left:3px solid #ff959a;border-radius:0 6px 6px 0;padding:10px 12px;margin:16px 0 0;font-size:14px}.calc-results{margin-top:25px;border-top:1px solid var(--line);padding-top:16px}.result-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 24px;margin:0 0 15px}.result-grid>div{min-width:0;padding:12px 0;border-bottom:1px solid var(--line)}.result-grid dt{color:var(--muted);font-size:12px}.result-grid dd{color:var(--blue);margin:4px 0 0;font-family:var(--measure);font-size:18px;font-weight:600;line-height:1.5;overflow-wrap:anywhere}.fit-line{color:var(--ink);font-size:15px;font-weight:600;margin:20px 0 14px}.calc-scene{display:block;width:100%;height:auto;background:#fff;border-radius:10px;margin:18px 0}
.download-links{display:flex;flex-wrap:wrap;gap:8px 24px;font-size:14px}.download-links a{display:inline-flex;align-items:center;min-height:44px}.sample-cta{padding:28px;border:1px solid rgba(0,212,255,.35);border-radius:16px;background:linear-gradient(135deg,rgba(0,212,255,.1),rgba(124,58,237,.1));margin-top:38px;text-align:center}.sample-cta h2{margin-top:0;padding-left:0;border-left:0}.sample-cta p:last-child{margin-bottom:0}.site-footer{padding:28px 24px;border-top:1px solid var(--line);text-align:center;color:var(--muted);font-size:13px}.site-footer a{color:var(--muted)}[hidden]{display:none!important}
@media(max-width:1200px){.site-top-inner{padding:0 16px;gap:12px}.site-nav{gap:12px}.site-nav a{font-size:13px}.brand{font-size:21px}}
@media(max-width:860px){.site-top-inner{flex-wrap:wrap;gap:0 10px}.lang-switch{margin-left:auto}.site-nav{width:100%;flex-wrap:wrap;justify-content:flex-start;margin-left:0;padding-bottom:12px;gap:0 20px}.js .site-top-inner{flex-wrap:nowrap}.js .menu-toggle{display:block}.js .site-nav{display:none;position:absolute;top:68px;left:0;right:0;width:auto;max-height:calc(100vh - 68px);max-height:calc(100dvh - 68px);overflow-y:auto;flex-direction:column;flex-wrap:nowrap;align-items:stretch;gap:0;padding:12px 24px;background:#141c2b;border-bottom:1px solid var(--line)}.js .site-top.nav-open .site-nav{display:flex}.js .site-nav a{width:100%;min-height:44px;font-size:14px}}
@media(max-width:640px){.site-top-inner{padding:0 16px;gap:0 8px}.brand{font-size:20px;letter-spacing:.5px}.lang-switch a{min-width:44px}.masthead{padding:30px 20px 0}.masthead h1{font-size:24px}.masthead .standfirst{font-size:15px}.byline{font-size:12px}.layout{padding:24px 20px 48px}.toc{padding:18px 20px}article h2{font-size:19px;margin-top:36px}article h3{font-size:17px}.calculator{padding:20px 16px}.calc-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:16px 12px}.calc-grid label{font-size:12px}.result-grid{grid-template-columns:1fr}.result-grid dd{font-size:18px}.table-scroll{margin:18px 0 22px}table{font-size:13px}th,td{padding:10px 12px}pre{padding:16px 14px;font-size:12px}figure{padding:8px}figcaption{font-size:12px;padding:10px 4px 2px}.sample-cta{padding:22px 18px}.draft-banner{text-align:left;font-size:12px}}
@media(max-width:380px){.site-top-inner{padding:0 12px;gap:0 6px}.brand{font-size:19px}.calc-grid{grid-template-columns:1fr}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{transition:none!important;animation:none!important}}
@media print{:root{color-scheme:light;color:#15253a;background:#fff}body{background:#fff}body::before,.site-top,.draft-banner,.toc,.calculator form,.skip-link{display:none!important}.js main{padding-top:0}.masthead,.layout{max-width:none;padding:16px}.masthead h1{font-size:26px}p,.byline,.masthead .standfirst,article h2,article h3,caption,th,td,figcaption,.calc-hint,.fit-line,.result-grid dt,.result-grid dd,a,.eyebrow{color:#15253a}figure,pre,.table-scroll,.calculator,.sample-cta,.note{background:#fff;box-shadow:none;border-color:#bac7d4}code,pre code{color:#15253a;background:#eef2f6}table{min-width:0}.table-scroll{overflow:visible}article h2{border-left-color:#15253a;break-after:avoid}figure,table{break-inside:avoid}}