/* Tidy Math: one clean sans-serif (Inter, self-hosted), solid brand colours (navy #0F2747, blue #2563EB, grey #E5E7EB), crisp 1px borders. */
@font-face{font-family:Inter;font-style:normal;font-weight:400 800;font-display:swap;src:url(/fonts/inter-latin.woff2) format("woff2");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
:root{--navy:#0F2747;--accent:#2563EB;--gold:var(--accent);--bg:#F5F7FB;--surface:#fff;--surface2:#EEF2F8;--tile:#E6EEFB;--line:#E5E7EB;--ink:#14223B;--hi:#0F2747;--muted:#566176;--link:#1D4ED8;--ico:#0F2747;--head:#fff;--btn:#2563EB;--btn-h:#1D4ED8;--btn-ink:#fff;--ok:#17724a;--bad:#b3261e;--r:10px;--r2:14px;--sh:0 1px 2px rgba(15,39,71,.06);--sh2:0 12px 32px -12px rgba(15,39,71,.22);--sans:Inter,system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;--hh:68px;
--tm-t:#0F2747;--tm-m:#2563EB;--tm-key:#0F2747;--tm-keyfg:#fff;--tm-eq:#2563EB;--tm-eqfg:#fff;--tm-tidy:#0F2747;--tm-math:#2563EB}
:root[data-theme=dark]{--navy:#0B1F3F;--accent:#3B82F6;--bg:#07132A;--surface:#0F2747;--surface2:#143156;--tile:#1B3C6B;--line:#22416E;--ink:#EAF0FA;--hi:#fff;--muted:#A8B7D0;--link:#8DB8FF;--ico:#9CC2FF;--head:#0A1D3A;--btn:#2563EB;--btn-h:#3B82F6;--ok:#5fd39a;--bad:#ff8a80;--sh:none;--sh2:0 12px 32px -12px rgba(0,0,0,.65);
--tm-t:#fff;--tm-m:#3B82F6;--tm-key:#fff;--tm-keyfg:#0F2747;--tm-eq:#fff;--tm-eqfg:#2563EB;--tm-tidy:#fff;--tm-math:#3B82F6}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:88px}
body{margin:0;background:var(--bg);color:var(--ink);font:400 16px/1.6 var(--sans);font-optical-sizing:auto;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;overflow-x:hidden}
::selection{background:var(--accent);color:#fff}
img,svg{max-width:100%}img{height:auto}
a{color:var(--link);text-underline-offset:3px}
h1,h2,h3,h4{font-family:var(--sans);font-weight:700;line-height:1.2;letter-spacing:-.022em;margin:0 0 .5em;color:var(--hi)}
h1{font-size:clamp(1.8rem,4.6vw,2.6rem);font-weight:800;letter-spacing:-.032em}
h2{font-size:clamp(1.35rem,3vw,1.75rem);margin-top:1.8em}
h3{font-size:1.1rem}
p{margin:0 0 1em}
code{font:.9em ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;background:var(--surface2);padding:.1em .35em;border-radius:4px}
:focus-visible{outline:3px solid color-mix(in srgb,var(--accent) 60%,transparent);outline-offset:2px;border-radius:6px}
[hidden]{display:none!important}
.skip{position:absolute;left:-999px;top:0;background:var(--navy);color:#fff;padding:.6rem 1rem;z-index:200}.skip:focus{left:8px;top:8px}
.wrap{width:100%;max-width:1180px;margin:0 auto;padding:0 16px}.narrow{max-width:800px}
main>.wrap,.page-top{padding-top:clamp(20px,3vw,32px)}
.muted{color:var(--muted)}
.sr{position:absolute!important;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
/* icons (SVG sprite, Lucide) */
.i{width:1.25em;height:1.25em;flex:none;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;vertical-align:-.22em}
.i.sm{width:1em;height:1em}.i.lg{width:1.6em;height:1.6em}
.ico{display:grid;place-items:center;width:44px;height:44px;border-radius:12px;background:var(--tile);color:var(--ico);flex:none}
.ico .i{width:22px;height:22px}
.ico.solid{background:var(--navy);color:#fff}:root[data-theme=dark] .ico.solid{background:var(--accent)}
/* header and logo */
.site-header{position:sticky;top:0;z-index:100;background:var(--head);border-bottom:1px solid var(--line)}
.hbar{display:flex;align-items:center;gap:16px;height:var(--hh)}
.logo{display:flex;align-items:center;gap:10px;color:var(--hi);text-decoration:none;flex:none}
.logo .tm-logo{display:block;height:34px;width:auto;aspect-ratio:456.16/80.6}
.logo .tm-mark{display:block;height:34px;width:auto;aspect-ratio:100/80.6}
.logo .wm{font:800 1.35rem var(--sans);letter-spacing:-.03em}
.nav{display:none;flex:1;justify-content:center;gap:4px}
.nav>a,.nav>button{position:relative;display:inline-flex;align-items:center;gap:5px;background:none;border:0;font:600 .94rem var(--sans);color:var(--ink);padding:.6rem .9rem;border-radius:var(--r);cursor:pointer;text-decoration:none;transition:background .15s,color .15s}
.nav>a:hover,.nav>button:hover,.nav>button[aria-expanded=true]{background:var(--surface2);color:var(--hi)}
.nav>a[aria-current=page],.nav>button[aria-current=page]{color:var(--accent)}
.nav>a[aria-current=page]::after,.nav>button[aria-current=page]::after{content:"";position:absolute;left:.9rem;right:.9rem;bottom:2px;height:2px;border-radius:2px;background:var(--accent)}
:root[data-theme=dark] .nav>a[aria-current=page],:root[data-theme=dark] .nav>button[aria-current=page]{color:#8DB8FF}
.nav .i{width:.9em;height:.9em;transition:transform .2s}.nav>button[aria-expanded=true] .i{transform:rotate(180deg)}
.hright{display:flex;align-items:center;gap:2px;margin-left:auto}
.ibtn{width:42px;height:42px;display:grid;place-items:center;background:none;border:0;border-radius:var(--r);color:var(--ink);cursor:pointer}
.ibtn:hover{background:var(--surface2)}.ibtn .i{width:21px;height:21px}
.ibtn .moon{display:block}.ibtn .sun{display:none}
:root[data-theme=dark] .ibtn .moon{display:none}:root[data-theme=dark] .ibtn .sun{display:block}
.burger{display:grid}
/* mega menu: a floating panel under the All Tools button */
.mega{position:absolute;left:0;right:0;top:100%;padding:10px 24px 0;pointer-events:none;visibility:hidden;opacity:0;transform:translateY(-8px) scale(.99);transform-origin:50% 0;transition:opacity .16s ease,transform .18s ease,visibility 0s linear .18s}
.mega.open{visibility:visible;opacity:1;transform:none;transition-delay:0s}
.mega-card{pointer-events:auto;display:grid;grid-template-columns:236px minmax(0,1fr);max-width:900px;margin:0 auto;background:var(--surface);border:1px solid var(--line);border-radius:18px;box-shadow:0 28px 64px -16px rgba(15,39,71,.32),0 4px 14px rgba(15,39,71,.08);overflow:hidden}
.mega-card.single{grid-template-columns:minmax(0,1fr);max-width:620px}
.mrail{display:flex;flex-direction:column;gap:4px;padding:14px;background:var(--surface2);border-right:1px solid var(--line)}
.mtab{display:flex;align-items:center;gap:12px;width:100%;padding:8px 10px;border:1px solid transparent;border-radius:12px;background:none;font:600 .93rem var(--sans);color:var(--ink);text-align:left;cursor:pointer;transition:background .15s,border-color .15s}
.mtab .ico{width:34px;height:34px;border-radius:10px;background:var(--surface);transition:background .15s,color .15s}.mtab .ico .i{width:18px;height:18px}
.mtab em{margin-left:auto;font:600 .75rem var(--sans);font-style:normal;color:var(--muted);background:var(--surface);border-radius:99px;padding:.1rem .5rem;min-width:24px;text-align:center}
.mtab:hover{background:color-mix(in srgb,var(--surface) 70%,transparent)}
.mtab.on{background:var(--surface);border-color:var(--line);box-shadow:var(--sh)}
.mtab.on .ico{background:var(--navy);color:#fff}:root[data-theme=dark] .mtab.on .ico{background:var(--accent)}
.mmain{padding:20px 22px 8px;min-width:0}
.mpane{display:none}.mpane.on{display:block;animation:mfade .2s ease}
@keyframes mfade{from{opacity:0;transform:translateY(5px)}to{opacity:1;transform:none}}
.mhead{display:flex;justify-content:space-between;align-items:flex-start;gap:16px;margin-bottom:10px}
.mhead h3{margin:0 0 2px;font-size:1.05rem}.mhead p{margin:0;color:var(--muted);font-size:.86rem}
.mhead a{display:inline-flex;align-items:center;gap:6px;font-size:.86rem;font-weight:600;white-space:nowrap;text-decoration:none}.mhead a:hover{text-decoration:underline}
.mtools{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:2px 10px;max-height:min(52vh,380px);overflow:auto;padding:2px 2px 10px}
.mega-card.single .mtools{grid-template-columns:1fr}
.mtool{display:flex;align-items:flex-start;gap:12px;padding:10px;border-radius:12px;text-decoration:none;color:var(--ink);transition:background .15s}
.mtool:hover,.mtool:focus-visible{background:var(--surface2)}
.mtool .ico{width:38px;height:38px;border-radius:10px}.mtool .ico .i{width:19px;height:19px}
.mtool b{display:flex;align-items:center;gap:8px;font-size:.93rem;font-weight:600;line-height:1.3}
.mtool b em{font:700 .66rem var(--sans);font-style:normal;letter-spacing:.02em;color:var(--link);background:color-mix(in srgb,var(--accent) 14%,transparent);padding:.1rem .45rem;border-radius:99px}
.mtool small{display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;margin-top:2px;color:var(--muted);font-size:.8rem;line-height:1.45}
.mfoot{grid-column:1/-1;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:14px 22px;border-top:1px solid var(--line);background:var(--surface)}
.mfoot p{margin:0;font-size:.86rem;color:var(--muted)}.mfoot .btn{white-space:nowrap;flex:none}
/* drawer */
.drawer{position:fixed;inset:0;z-index:300;background:var(--bg);transform:translateX(100%);transition:transform .24s ease;overflow-y:auto;visibility:hidden}
.drawer.open{transform:none;visibility:visible}
.dhead{display:flex;justify-content:space-between;align-items:center;height:var(--hh);padding:0 16px;border-bottom:1px solid var(--line);background:var(--head)}
.dbody{padding:8px 16px 40px}
.dbody>a,.acc>button{display:flex;align-items:center;justify-content:space-between;width:100%;padding:16px 4px;border:0;border-bottom:1px solid var(--line);background:none;font:600 1.05rem var(--sans);color:var(--ink);text-decoration:none;cursor:pointer;text-align:left}
.acc>button .i{transition:transform .2s}.acc>button[aria-expanded=true] .i{transform:rotate(180deg)}
.acc>div{display:none;padding:4px 0 14px 8px}
.acc button[aria-expanded=true]+div{display:block}
.acc div a:not(.btn){display:flex;align-items:center;gap:10px;padding:10px 0;color:var(--ink);text-decoration:none;font-weight:500}
.acc div .btn{margin-top:10px;color:#fff!important}
.acc div strong{display:flex;align-items:center;gap:8px;margin:12px 0 2px;font-size:.78rem;letter-spacing:.06em;text-transform:uppercase;color:var(--muted)}
/* search overlay */
.sov{position:fixed;inset:0;background:rgba(7,19,42,.62);z-index:400;display:none;padding:70px 16px}
.sov.open{display:block}
.sbox{max-width:640px;margin:0 auto;background:var(--surface);border-radius:16px;padding:14px;box-shadow:0 24px 60px rgba(0,0,0,.35)}
.sres{max-height:55vh;overflow:auto;margin-top:8px}
.sres a{display:flex;gap:12px;align-items:center;padding:10px;border-radius:var(--r);text-decoration:none;color:var(--ink)}
.sres a:hover,.sres a:focus{background:var(--surface2)}
.sres small{color:var(--muted);display:block;font-weight:400}.sres b{font-weight:600}
/* buttons and forms */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:.7rem 1.25rem;border-radius:var(--r);border:1.5px solid var(--btn);background:var(--btn);color:var(--btn-ink)!important;font:600 .95rem var(--sans);cursor:pointer;text-decoration:none!important;min-height:44px;box-shadow:0 1px 2px rgba(15,39,71,.2);transition:background .15s,border-color .15s,box-shadow .15s,transform .1s}
.btn:hover{background:var(--btn-h);border-color:var(--btn-h);box-shadow:0 6px 16px -6px color-mix(in srgb,var(--accent) 70%,transparent)}
.btn:active{transform:translateY(1px)}
.btn.alt{background:var(--surface);color:var(--hi)!important;border-color:var(--line);box-shadow:none}
.btn.alt:hover{background:var(--surface);border-color:var(--accent);color:var(--link)!important;box-shadow:0 6px 16px -10px rgba(15,39,71,.4)}
.btn.alt .i{transition:transform .15s}.btn.alt:hover .i{transform:translateX(3px)}
.btn.gold{background:var(--btn);border-color:var(--btn);color:#fff!important}
.btn.sm{padding:.4rem .9rem;min-height:38px;font-size:.88rem}
.btn.danger{background:var(--bad);border-color:var(--bad);color:#fff!important}
.btn:disabled{opacity:.55;cursor:not-allowed}
input,select,textarea{font:inherit;color:var(--ink);background:var(--surface);border:1.5px solid var(--line);border-radius:var(--r);padding:.65rem .8rem;min-height:44px;width:100%;max-width:100%}
textarea{min-height:110px;resize:vertical}
input:focus,select:focus,textarea:focus{border-color:var(--accent);outline:3px solid color-mix(in srgb,var(--accent) 28%,transparent);outline-offset:0}
input[type=checkbox],input[type=radio]{width:18px;height:18px;min-height:0;accent-color:var(--accent)}
input[type=range]{padding:0;accent-color:var(--accent);min-height:28px}
input[type=color]{padding:2px;min-height:44px}
label{display:block;font-weight:600;font-size:.9rem;margin-bottom:6px}
.fld{margin-bottom:16px}.fld .hint{font-size:.82rem;color:var(--muted);margin-top:4px}
.inp{display:flex;align-items:stretch}
.inp>span{display:grid;place-items:center;padding:0 .8rem;background:var(--surface2);border:1.5px solid var(--line);color:var(--muted);font-weight:600}
.inp>span:first-child{border-right:0;border-radius:var(--r) 0 0 var(--r)}.inp>span:last-child{border-left:0;border-radius:0 var(--r) var(--r) 0}
.inp input{border-radius:0}.inp>span+input{border-radius:0 var(--r) var(--r) 0}.inp input:has(+span){border-radius:var(--r) 0 0 var(--r)}
.row2{display:grid;gap:12px;grid-template-columns:1fr}
.chk{display:flex;flex-wrap:wrap;gap:8px;align-items:center}.chk label{margin:0;font-weight:500}
/* breadcrumb bar under the header */
.crumbbar{background:var(--surface);border-bottom:1px solid var(--line)}
.crumbs ol{list-style:none;margin:0;padding:8px 0;display:flex;align-items:center;gap:2px;overflow-x:auto;white-space:nowrap;scrollbar-width:none;font-size:.86rem}
.crumbs ol::-webkit-scrollbar{display:none}
.crumbs li{display:flex;align-items:center;gap:2px;flex:none}
.crumbs .sep{color:var(--muted);opacity:.55;width:.95em;height:.95em}
.crumbs a{display:inline-flex;align-items:center;gap:6px;padding:5px 10px;border-radius:8px;color:var(--muted);font-weight:500;text-decoration:none;transition:background .15s,color .15s}
.crumbs a:hover{background:var(--surface2);color:var(--hi)}
.crumbs a .i{color:var(--accent)}
.crumbs [aria-current]{display:block;padding:5px 10px;font-weight:600;color:var(--hi);max-width:min(60vw,440px);overflow:hidden;text-overflow:ellipsis}
/* ads (empty until AdSense is configured) */
.ad{margin:20px auto;text-align:center;overflow:hidden}.ad:empty{display:none}.ad ins{display:block}
/* page head (tool and article) */
.byline{display:flex;flex-wrap:wrap;align-items:center;gap:6px 14px;font-size:.88rem;color:var(--muted);margin:0 0 18px}
.byline a{color:inherit;text-decoration:none;display:inline-flex;align-items:center;gap:8px}.byline a:hover{color:var(--link)}
.byline img{width:28px;height:28px;border-radius:50%;object-fit:cover}
.byline .dot::before{content:"\00b7";margin-right:14px}
.chip{display:inline-flex;align-items:center;gap:6px;padding:.25rem .7rem;border-radius:99px;background:var(--tile);color:var(--ico);font-size:.8rem;font-weight:600;text-decoration:none;transition:background .15s}
.chip:hover{background:color-mix(in srgb,var(--accent) 22%,var(--tile))}
.lead{font-size:1.1rem;color:var(--muted);max-width:760px}
.disc{display:flex;gap:8px;align-items:flex-start;margin:14px 0 0;font-size:.84rem;color:var(--muted)}.disc .i{margin-top:3px;flex:none}
.jump{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin:28px 0 0;font-size:.88rem}
.jump span{color:var(--muted);font-weight:600;margin-right:2px}
.jump a{padding:.3rem .85rem;border-radius:99px;background:var(--surface);border:1px solid var(--line);color:var(--ink);font-weight:600;text-decoration:none;transition:border-color .15s,color .15s}
.jump a:hover{border-color:var(--accent);color:var(--link)}
/* tool layout */
.tool-grid{display:grid;gap:20px;grid-template-columns:minmax(0,1fr);margin:18px 0 8px}
.panel{background:var(--surface);border:1px solid var(--line);border-radius:var(--r2);padding:20px;box-shadow:var(--sh)}
.panel h2{font-size:1.1rem;margin:0 0 16px}
.actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:14px}
.res{animation:pop .3s ease}
@keyframes pop{from{opacity:.4;transform:translateY(5px)}to{opacity:1;transform:none}}
.big{background:var(--navy);color:#fff;border-radius:12px;padding:16px 18px;margin-bottom:12px}
:root[data-theme=dark] .big{background:var(--accent)}
.big small{display:block;opacity:.85;font-size:.8rem;text-transform:uppercase;letter-spacing:.06em;font-weight:600}
.big b{display:block;font-weight:800;letter-spacing:-.03em;font-size:clamp(1.55rem,5.5vw,2.2rem);word-break:break-word;font-variant-numeric:tabular-nums}
.stats{display:grid;gap:8px;grid-template-columns:repeat(2,minmax(0,1fr))}
.stat{background:var(--surface2);border-radius:var(--r);padding:10px 12px}
.stat small{display:block;color:var(--muted);font-size:.78rem;font-weight:500}.stat b{font-size:1.02rem;font-weight:700;word-break:break-word;font-variant-numeric:tabular-nums}
.stat.wide{grid-column:1/-1}
.tbl{width:100%;border-collapse:collapse;font-size:.88rem;font-variant-numeric:tabular-nums}
.tbl th,.tbl td{padding:8px 10px;text-align:right;border-bottom:1px solid var(--line)}
.tbl th:first-child,.tbl td:first-child{text-align:left}
.tbl th{background:var(--surface2);position:sticky;top:0;font-size:.76rem;text-transform:uppercase;letter-spacing:.05em;font-weight:700}
.scroll{overflow:auto;max-height:380px;border:1px solid var(--line);border-radius:var(--r);margin-top:12px;-webkit-overflow-scrolling:touch}.scroll.nomax{max-height:none}
.note{display:flex;gap:10px;font-size:.88rem;color:var(--muted);background:var(--surface2);border-left:4px solid var(--accent);padding:10px 12px;border-radius:6px;margin-top:12px}
.note>.i{margin-top:2px;color:var(--accent)}
.tabs{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:14px}
.tab{display:inline-flex;align-items:center;gap:6px;padding:.45rem .95rem;border:1.5px solid var(--line);background:var(--surface);color:var(--ink);border-radius:99px;font:600 .88rem var(--sans);cursor:pointer;transition:border-color .15s,background .15s}
.tab:hover{border-color:var(--accent)}
.tab[aria-pressed=true],.tab.on{background:var(--navy);border-color:var(--navy);color:#fff}
:root[data-theme=dark] .tab[aria-pressed=true],:root[data-theme=dark] .tab.on{background:var(--accent);border-color:var(--accent)}
.chart{width:100%;height:auto;display:block}.bar{font-size:.85rem}
.pw{font:600 1.15rem ui-monospace,Menlo,Consolas,monospace;word-break:break-all;background:var(--surface2);padding:14px;border-radius:var(--r);min-height:56px}
.meter{height:8px;background:var(--surface2);border-radius:9px;overflow:hidden;margin-top:8px}.meter i{display:block;height:100%;transition:width .3s,background .3s}
.dyn{display:grid;gap:8px;grid-template-columns:repeat(2,minmax(0,1fr));padding:10px;border:1px dashed var(--line);border-radius:var(--r);margin-bottom:10px}
.dyn .full{grid-column:1/-1}
/* content */
.prose{max-width:760px;font-size:1.04rem;line-height:1.75}
.prose ul,.prose ol{padding-left:1.3em}.prose li{margin-bottom:.45em}
.prose h2{margin-top:2em}
.prose table{margin:1.2em 0}
.faq details{background:var(--surface);border:1px solid var(--line);border-radius:12px;margin-bottom:10px;padding:0 18px;transition:border-color .15s}
.faq details[open],.faq details:hover{border-color:color-mix(in srgb,var(--accent) 45%,var(--line))}
.faq summary{cursor:pointer;font-weight:600;padding:15px 0;list-style:none;display:flex;justify-content:space-between;gap:12px;align-items:center;color:var(--hi)}
.faq summary::after{content:"";width:9px;height:9px;border-right:2px solid currentColor;border-bottom:2px solid currentColor;transform:rotate(45deg);transition:transform .2s;flex:none;margin-right:4px}
.faq details[open] summary::after{transform:rotate(-135deg)}
.faq summary::-webkit-details-marker{display:none}
.faq details p{color:var(--muted);margin:0 0 16px}
.faq.wide{max-width:860px}
.formula{background:var(--surface2);border-left:4px solid var(--accent);padding:12px 16px;border-radius:6px;font:.92rem/1.7 ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;overflow-x:auto}
.toc{background:var(--surface);border:1px solid var(--line);border-radius:var(--r2);padding:16px 20px;margin:0 0 28px}
.toc strong{display:flex;align-items:center;gap:8px;font-size:.95rem;margin-bottom:8px;color:var(--hi)}
.toc ol{margin:0;padding-left:1.2em}.toc li{margin:.25em 0}.toc a{text-decoration:none}.toc a:hover{text-decoration:underline}
/* cards */
.cards{display:grid;gap:16px;grid-template-columns:minmax(0,1fr)}
.card{display:flex;flex-direction:column;gap:6px;background:var(--surface);border:1px solid var(--line);border-radius:var(--r2);padding:20px;text-decoration:none;color:var(--ink);box-shadow:var(--sh);transition:border-color .18s,transform .18s,box-shadow .18s}
a.card:hover{border-color:var(--accent);transform:translateY(-3px);box-shadow:var(--sh2)}
.card .ico{margin-bottom:8px}
.card h3{font-size:1.05rem;margin:0}
.card p{margin:0;color:var(--muted);font-size:.92rem}
.card .go{display:inline-flex;align-items:center;gap:6px;margin-top:auto;padding-top:12px;color:var(--link);font-weight:600;font-size:.9rem}
.card .go .i{transition:transform .15s}a.card:hover .go .i{transform:translateX(3px)}
.card.flat{box-shadow:none}
.badge{display:inline-block;font-size:.68rem;font-weight:700;background:var(--accent);color:#fff;padding:2px 8px;border-radius:99px;margin-left:6px;vertical-align:middle;letter-spacing:.02em}
.pcard{padding:0;overflow:hidden;gap:0}
.pthumb{height:116px;display:grid;place-items:center;color:#fff}.pthumb .i{width:44px;height:44px;stroke-width:1.6}
.t1{background:#0F2747}.t2{background:#2563EB}.t3{background:#1E3A8A}.t4{background:#0E7490}.t5{background:#3B5BA9}.t6{background:#334A73}
.pbody{padding:16px 18px 18px;display:flex;flex-direction:column;gap:6px;flex:1}
.meta{font-size:.82rem;color:var(--muted);margin:0}
/* home */
.hero{background:var(--navy);color:#fff;padding:48px 0 44px}
.hero-grid{display:grid;gap:32px}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:.85rem;font-weight:600;color:#C9DBFF;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.16);border-radius:99px;padding:.3rem .85rem;margin:0 0 16px}
.hero h1{color:#fff;margin-bottom:.45em;max-width:16em}
.hero .lead{color:#D0DBF0;font-size:1.12rem}
.hero .sform{display:flex;gap:8px;max-width:580px;margin:24px 0 16px}
.hero .sform input{border:0;min-height:50px}.hero .sform .btn{min-height:50px}
.pop{display:flex;flex-wrap:wrap;gap:8px;align-items:center;font-size:.88rem;color:#B9C7E0}
.pop a{color:#fff;background:rgba(255,255,255,.1);padding:.25rem .75rem;border-radius:99px;text-decoration:none;font-weight:500;transition:background .15s}.pop a:hover{background:rgba(255,255,255,.2)}
.hero-panel{background:var(--surface);color:var(--ink);border-radius:var(--r2);padding:18px;box-shadow:0 24px 50px -20px rgba(0,0,0,.5)}
.hero-panel h2{margin:0 0 10px;font-size:1rem}
.hero-panel a{display:flex;align-items:center;gap:12px;padding:10px;border-radius:12px;text-decoration:none;color:var(--ink);font-weight:600;transition:background .15s}
.hero-panel a:hover{background:var(--surface2)}
.hero-panel a small{display:block;color:var(--muted);font-weight:400;font-size:.82rem}
.hero-panel .ico{width:40px;height:40px}
.trust{background:var(--surface);border-bottom:1px solid var(--line)}
.trust ul{list-style:none;margin:0;padding:16px 0;display:grid;gap:12px 18px;grid-template-columns:repeat(2,minmax(0,1fr));font-size:.9rem;font-weight:600}
.trust li{display:flex;align-items:center;gap:10px}.trust .i{color:var(--accent)}
.sect{padding:clamp(44px,6vw,72px) 0}.sect.alt{background:var(--surface2)}
.sect-head{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:flex-end;gap:14px 24px;margin-bottom:clamp(22px,3vw,32px)}
.sect-head h2{margin:0 0 6px}.sect-head p{margin:0;color:var(--muted)}
.cat-head{margin:44px 0 20px}.cat-head h2{display:flex;align-items:center;gap:12px;margin:0}.cat-head p{margin:0}
.filters{display:flex;gap:8px;flex-wrap:wrap;margin:0 0 22px}
.steps{list-style:none;margin:0;padding:0;display:grid;gap:20px;grid-template-columns:minmax(0,1fr)}
.step{background:var(--surface);border:1px solid var(--line);border-radius:var(--r2);padding:24px}
.step .num{display:grid;place-items:center;width:40px;height:40px;border-radius:12px;background:var(--navy);color:#fff;font-weight:800;font-size:1.05rem;margin-bottom:16px}
.step .num.eq{background:var(--accent)}
:root[data-theme=dark] .step .num{background:var(--tile);color:#fff}:root[data-theme=dark] .step .num.eq{background:var(--accent)}
.step h3{margin:0 0 6px}.step p{margin:0;color:var(--muted);font-size:.95rem}
.author-strip{display:flex;gap:18px;align-items:center;background:var(--surface);border:1px solid var(--line);border-radius:var(--r2);padding:20px}
.author-strip img{width:72px;height:72px;border-radius:50%;object-fit:cover;flex:none}
.author-strip p{margin:0 0 10px}
.news{background:var(--navy);color:#fff;border-radius:var(--r2);padding:clamp(24px,4vw,40px)}
:root[data-theme=dark] .news{background:var(--surface2)}
.news h2{color:#fff;margin-top:0}.news p{color:#D0DBF0}
.news form{display:flex;gap:8px;flex-wrap:wrap;max-width:560px}.news input[type=email]{flex:1 1 220px;border:0}
/* about */
.about-hero{display:flex;gap:clamp(18px,3vw,36px);align-items:center;background:var(--surface);border:1px solid var(--line);border-radius:var(--r2);padding:clamp(18px,3vw,32px);margin:0 0 8px}
.about-hero img{width:150px;height:150px;border-radius:50%;object-fit:cover;flex:none;border:4px solid var(--surface2)}
.about-hero h1{font-size:clamp(1.5rem,3.4vw,2.1rem);margin:0 0 .35em}
.about-hero p{margin:0 0 .8em;color:var(--muted)}
.tags{display:flex;flex-wrap:wrap;gap:8px;list-style:none;margin:12px 0 0;padding:0}
.tags li{background:var(--surface2);border-radius:99px;padding:.3rem .85rem;font-size:.85rem;font-weight:600}
/* article */
.article-wrap{display:block}
.article h1{margin:6px 0 10px}
.article .prose{max-width:720px}
.ahero{display:flex;align-items:center;gap:14px;margin:0 0 18px}
.cta{display:flex;gap:14px;align-items:center;background:var(--surface);border:1px solid var(--line);border-left:5px solid var(--accent);border-radius:var(--r);padding:16px;margin:28px 0}
.cta p{margin:0}.cta .btn{margin-left:auto;flex:none}
.bio{display:flex;gap:16px;align-items:center;background:var(--surface);border:1px solid var(--line);border-radius:var(--r2);padding:18px;margin:32px 0}
.bio img{width:64px;height:64px;border-radius:50%;object-fit:cover;flex:none}
.bio p{margin:.2em 0 0;color:var(--muted);font-size:.93rem}
.bio a{font-weight:600}
/* footer (always navy, so the logo uses its on-navy colours) */
.site-footer{--tm-t:#fff;--tm-m:#3B82F6;--tm-key:#fff;--tm-keyfg:#0F2747;--tm-eq:#fff;--tm-eqfg:#2563EB;--tm-tidy:#fff;--tm-math:#3B82F6;--hi:#fff;background:var(--navy);color:#C5D1E8;margin-top:56px;padding:48px 0 22px;font-size:.92rem}
:root[data-theme=dark] .site-footer{background:#050E1F}
.site-footer a{color:#E8EEF9;text-decoration:none}.site-footer a:hover{text-decoration:underline;color:#9CC2FF}
.site-footer .logo .tm-logo{height:40px}
.site-footer h3{color:#fff;font:700 .8rem var(--sans);letter-spacing:.07em;text-transform:uppercase;margin-bottom:12px}
.fgrid{display:grid;gap:30px;grid-template-columns:repeat(2,minmax(0,1fr))}
.fgrid .brand{grid-column:1/-1}.fgrid .brand p{margin:14px 0 0;max-width:34em}
.fgrid ul{list-style:none;margin:0;padding:0}.fgrid li{padding:4px 0}
.fcopy{border-top:1px solid #243C66;margin-top:32px;padding-top:18px;display:flex;flex-wrap:wrap;gap:10px 24px;justify-content:space-between;font-size:.82rem;color:#9FB0CC}
.social{display:flex;gap:10px;margin-top:16px}.social a{width:38px;height:38px;display:grid;place-items:center;border:1px solid #34507F;border-radius:50%;transition:background .15s,border-color .15s}.social a:hover{background:rgba(255,255,255,.1);border-color:#6B8FCB;text-decoration:none}.social .i{width:17px;height:17px}
/* cookie and toast */
.cookie{position:fixed;left:12px;right:12px;bottom:12px;z-index:500;background:var(--surface);border:1px solid var(--line);box-shadow:0 12px 36px rgba(7,19,42,.3);border-radius:var(--r2);padding:14px 16px;display:none;gap:12px;flex-wrap:wrap;align-items:center;max-width:780px;margin:0 auto}
.cookie.show{display:flex}.cookie p{margin:0;flex:1 1 260px;font-size:.88rem}
.toast{position:fixed;left:50%;bottom:22px;transform:translate(-50%,30px);background:var(--navy);color:#fff;padding:10px 18px;border-radius:99px;opacity:0;pointer-events:none;transition:.25s;z-index:600;font-size:.9rem;font-weight:500}
.toast.show{opacity:1;transform:translate(-50%,0)}
.soon{text-align:center;padding:60px 16px}
.err404{padding:50px 0 20px}
/* tablet and up */
@media(min-width:640px){.cards{grid-template-columns:repeat(2,minmax(0,1fr))}.row2{grid-template-columns:1fr 1fr}.fgrid{grid-template-columns:1.5fr 1fr 1fr 1fr}.fgrid .brand{grid-column:auto}.dyn{grid-template-columns:repeat(4,minmax(0,1fr))}.stats{grid-template-columns:repeat(3,minmax(0,1fr))}.wrap{padding:0 24px}.trust ul{grid-template-columns:repeat(4,auto);justify-content:space-between}.steps{grid-template-columns:repeat(3,minmax(0,1fr))}}
@media(min-width:768px){.cards.three{grid-template-columns:repeat(3,minmax(0,1fr))}}
@media(min-width:1024px){.nav{display:flex}.burger{display:none}.cards{grid-template-columns:repeat(3,minmax(0,1fr))}.tool-grid{grid-template-columns:minmax(0,5fr) minmax(0,6fr);align-items:start}.tool-grid .sticky{position:sticky;top:calc(var(--hh) + 14px)}.hero{padding:72px 0 64px}.hero-grid{grid-template-columns:minmax(0,1.25fr) minmax(0,.75fr);align-items:center;gap:56px}.cards.four{grid-template-columns:repeat(4,minmax(0,1fr))}}
@media(max-width:1023px){.mega{display:none!important}}
@media(max-width:640px){.about-hero{flex-direction:column;text-align:center}.tags{justify-content:center}.cta{flex-direction:column;align-items:flex-start}.cta .btn{margin-left:0}.author-strip{flex-direction:column;text-align:center}.logo .tm-logo,.logo .tm-mark{height:30px}.sect-head{align-items:flex-start}}
@media(max-width:380px){.logo .tm-logo,.logo .tm-mark{height:26px}.stats{grid-template-columns:1fr}.hero .sform{flex-direction:column}.bio{flex-direction:column;text-align:center}}
@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important;scroll-behavior:auto!important}}
@media print{.site-header,.site-footer,.ad,.cookie,.crumbbar,.no-print,.sov,.drawer{display:none!important}body{background:#fff;color:#000}}