:root{
  --bg:#FAFAF9; --surface:#FFFFFF; --surface-2:#F3F2EF; --line:#E7E5E4;
  --ink:#1C1917; --body:#57534E; --muted:#78716C;
  --brand:#0F766E; --brand-ink:#FFFFFF; --brand-soft:#E6F2F0; --brand-deep:#0B524D;
  --amber:#F59E0B; --amber-soft:#FEF3C7; --amber-ink:#78350F;
  --c1:#0F766E; --c2:#F59E0B; --c3:#5EA8A0; --c4:#A8A29E; --c5:#B45309;
  --shadow:0 1px 2px rgba(28,25,23,.04),0 8px 24px -12px rgba(28,25,23,.12);
  --radius-lg:20px; --radius:12px; --radius-sm:8px;
  --head:"Plus Jakarta Sans",ui-sans-serif,system-ui,-apple-system,"Segoe UI",sans-serif;
  --sans:"Inter",ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  box-sizing:border-box;
  padding-top:env(safe-area-inset-top,0px); padding-bottom:env(safe-area-inset-bottom,0px);
  color-scheme:light;
}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]){
    --bg:#121614; --surface:#1A201E; --surface-2:#222A27; --line:#2E3834;
    --ink:#F5F5F4; --body:#C4C0BC; --muted:#9A948F;
    --brand:#2DB3A5; --brand-ink:#06201D; --brand-soft:#16312D; --brand-deep:#7DD9CE;
    --amber:#FBBF24; --amber-soft:#3A2E12; --amber-ink:#FDE68A;
    --c1:#2DB3A5; --c2:#FBBF24; --c3:#7DD9CE; --c4:#6B6560; --c5:#F97316;
    --shadow:0 1px 2px rgba(0,0,0,.3),0 8px 24px -12px rgba(0,0,0,.5);
    color-scheme:dark;
  }
}
:root[data-theme="dark"]{
  --bg:#121614; --surface:#1A201E; --surface-2:#222A27; --line:#2E3834;
  --ink:#F5F5F4; --body:#C4C0BC; --muted:#9A948F;
  --brand:#2DB3A5; --brand-ink:#06201D; --brand-soft:#16312D; --brand-deep:#7DD9CE;
  --amber:#FBBF24; --amber-soft:#3A2E12; --amber-ink:#FDE68A;
  --c1:#2DB3A5; --c2:#FBBF24; --c3:#7DD9CE; --c4:#6B6560; --c5:#F97316;
  --shadow:0 1px 2px rgba(0,0,0,.3),0 8px 24px -12px rgba(0,0,0,.5);
  color-scheme:dark;
}
html{scroll-padding-top:calc(env(safe-area-inset-top,0px) + 80px);scroll-behavior:smooth}
*,*::before,*::after{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--body);font-family:var(--sans);font-size:17px;line-height:1.7;-webkit-font-smoothing:antialiased}
h1,h2,h3,h4{font-family:var(--head);color:var(--ink);line-height:1.2;margin:0;letter-spacing:-.02em}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%}
:focus-visible{outline:3px solid var(--amber);outline-offset:2px;border-radius:4px}
.wrap{max-width:1180px;margin:0 auto;padding:0 20px}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}
button{font:inherit;cursor:pointer}
@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important;scroll-behavior:auto!important}}

/* Header */
.header{position:sticky;top:env(safe-area-inset-top,0px);z-index:50;background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.header .wrap{display:flex;align-items:center;gap:24px;height:64px}
.logo{display:flex;align-items:center;gap:11px;font-family:var(--head);font-weight:800;font-size:20px;color:var(--ink);letter-spacing:-.04em}
.logo:hover{text-decoration:none}
.logo-mark{width:32px;height:32px;border-radius:10px;background:linear-gradient(145deg,var(--brand) 10%,var(--brand-deep));display:grid;place-items:center;position:relative;overflow:hidden;box-shadow:0 5px 12px color-mix(in srgb,var(--brand) 24%,transparent),inset 0 1px 0 rgba(255,255,255,.22)}
.logo-mark::before{content:"";position:absolute;inset:-14px 8px auto;height:20px;transform:rotate(-25deg);background:rgba(255,255,255,.15);border-radius:999px}
.logo-mark::after{content:"";position:absolute;width:9px;height:9px;right:4px;top:4px;border-top:2px solid var(--amber);border-right:2px solid var(--amber);transform:skew(-12deg) rotate(-1deg);filter:drop-shadow(0 1px 0 rgba(0,0,0,.12))}
.logo-mark svg{position:relative;z-index:1;width:18px;height:18px;filter:drop-shadow(0 1px 1px rgba(0,0,0,.12))}
.nav{display:flex;gap:4px;margin-left:8px}
.nav a,.nav button{padding:8px 12px;border-radius:8px;color:var(--body);font-weight:500;font-size:15px;background:none;border:0}
.nav a:hover,.nav button:hover{background:var(--surface-2);color:var(--ink);text-decoration:none}
.dd{position:relative}
.dd-menu{position:absolute;top:calc(100% + 8px);left:0;width:520px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:16px;display:none;grid-template-columns:1fr 1fr;gap:4px 16px}
.dd.open .dd-menu{display:grid}
.dd-menu a{display:block;padding:8px 10px;border-radius:8px;font-size:15px;color:var(--ink)}
.dd-menu a small{display:block;color:var(--muted);font-size:13px;line-height:1.4}
.header-right{margin-left:auto;display:flex;align-items:center;gap:8px}
.icon-btn{width:40px;height:40px;border-radius:10px;border:1px solid var(--line);background:var(--surface);color:var(--ink);display:grid;place-items:center}
.icon-btn:hover{background:var(--surface-2)}
.btn{display:inline-flex;align-items:center;gap:8px;padding:10px 18px;border-radius:10px;font-weight:600;font-size:15px;border:1px solid transparent;transition:background .15s,transform .1s}
.btn:active{transform:translateY(1px)}
.btn-primary{background:var(--brand);color:var(--brand-ink)}
.btn-primary:hover{background:var(--brand-deep);text-decoration:none;color:var(--brand-ink)}
.btn-ghost{background:var(--surface);border-color:var(--line);color:var(--ink)}
.btn-ghost:hover{background:var(--surface-2);text-decoration:none}
.btn-amber{background:var(--amber);color:#1C1917}
.btn-amber:hover{filter:brightness(.95);text-decoration:none}
.menu-btn{display:none}
@media (max-width:860px){
  .nav{display:none;position:absolute;top:64px;left:0;right:0;flex-direction:column;background:var(--surface);border-bottom:1px solid var(--line);padding:12px 20px}
  .nav.open{display:flex}
  .dd-menu{position:static;width:auto;grid-template-columns:1fr;box-shadow:none;border:0;padding:0 0 0 8px}
  .menu-btn{display:grid}
}

/* Home hero */
.hero{padding:64px 0 48px}
.hero-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:56px;align-items:center}
.hero h1{font-size:clamp(38px,5.4vw,64px);font-weight:800;letter-spacing:-.04em;line-height:1.02;margin-bottom:20px}
.hero p.lead{font-size:19px;max-width:34ch;margin:0 0 28px}
.search{position:relative;max-width:520px}
.search input{width:100%;height:56px;border-radius:14px;border:1px solid var(--line);background:var(--surface);padding:0 18px 0 50px;font:inherit;color:var(--ink);box-shadow:var(--shadow)}
.search input:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 4px var(--brand-soft)}
.search svg{position:absolute;left:18px;top:18px;color:var(--muted)}
.search-results{position:absolute;top:62px;left:0;right:0;background:var(--surface);border:1px solid var(--line);border-radius:14px;box-shadow:var(--shadow);padding:6px;z-index:20;display:none}
.search-results.show{display:block}
.search-results a{display:flex;justify-content:space-between;padding:10px 12px;border-radius:8px;color:var(--ink);font-size:15px}
.search-results a:hover,.search-results a.active{background:var(--surface-2);text-decoration:none}
.search-results span{color:var(--muted);font-size:13px}
.search-results .empty{padding:12px;color:var(--muted);font-size:15px}
.quick{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px}
.chip{padding:7px 14px;border-radius:999px;background:var(--surface);border:1px solid var(--line);font-size:14px;font-weight:500;color:var(--ink)}
.chip:hover{border-color:var(--brand);color:var(--brand);text-decoration:none}

/* Live demo in hero */
.demo{background:var(--surface);border:1px solid var(--line);border-radius:24px;box-shadow:var(--shadow);padding:28px;position:relative}
.demo-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:6px}
.demo-top h2{font-size:16px;font-weight:600}
.live{display:inline-flex;align-items:center;gap:6px;font-size:13px;color:var(--brand);font-weight:600}
.live i{width:7px;height:7px;border-radius:50%;background:var(--brand);animation:pulse 2s infinite}
@keyframes pulse{50%{opacity:.35}}
.demo-big{font-family:var(--head);font-size:clamp(44px,5vw,58px);font-weight:800;color:var(--ink);letter-spacing:-.04em;line-height:1.1;font-variant-numeric:tabular-nums}
.demo-big small{font-size:18px;font-weight:600;color:var(--muted);letter-spacing:0}
.demo-sub{font-size:14px;color:var(--muted);margin-bottom:22px}
.demo-row{margin-bottom:16px}
.demo-row label{display:flex;justify-content:space-between;font-size:14px;font-weight:500;color:var(--ink);margin-bottom:6px}
.demo-row label b{font-variant-numeric:tabular-nums}
.demo .btn{width:100%;justify-content:center;margin-top:8px}

input[type=range]{-webkit-appearance:none;appearance:none;width:100%;height:6px;border-radius:999px;background:linear-gradient(var(--brand),var(--brand)) 0/var(--p,50%) 100% no-repeat,var(--surface-2);outline-offset:6px}
input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;width:22px;height:22px;border-radius:50%;background:var(--surface);border:3px solid var(--brand);box-shadow:0 2px 6px rgba(0,0,0,.15)}
input[type=range]::-moz-range-thumb{width:18px;height:18px;border-radius:50%;background:var(--surface);border:3px solid var(--brand)}

.trust{border-block:1px solid var(--line);padding:18px 0;margin-top:40px}
.trust ul{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:12px 36px;justify-content:space-between}
.trust li{display:flex;align-items:center;gap:10px;font-size:15px;color:var(--ink);font-weight:500}
.trust svg{color:var(--brand);flex:none}

section.block{padding:72px 0}
.block-head{display:flex;justify-content:space-between;align-items:end;gap:20px;margin-bottom:32px}
.block-head h2{font-size:clamp(28px,3.4vw,38px);font-weight:700}
.block-head p{margin:8px 0 0;max-width:52ch}

/* Categories: an index layout, not a card grid */
.cats{display:grid;grid-template-columns:repeat(3,1fr);border-top:1px solid var(--line)}
.cat{padding:28px 24px 28px 0;border-bottom:1px solid var(--line);display:flex;gap:18px;color:inherit}
.cat:nth-child(3n+2),.cat:nth-child(3n+3){padding-left:24px;border-left:1px solid var(--line)}
.cat:hover{text-decoration:none}
.cat:hover h3{color:var(--brand)}
.cat-ico{width:46px;height:46px;border-radius:14px;background:linear-gradient(145deg,var(--brand-soft),color-mix(in srgb,var(--brand-soft) 72%,var(--surface)));color:var(--brand);display:grid;place-items:center;flex:none;border:1px solid color-mix(in srgb,var(--brand) 13%,transparent);box-shadow:0 3px 10px color-mix(in srgb,var(--brand) 10%,transparent)}
.cat-ico svg{transition:transform .18s ease}
.cat:hover .cat-ico svg,.pop:hover .cat-ico svg{transform:scale(1.08) translateY(-1px)}
.cat h3{font-size:18px;font-weight:700;margin-bottom:4px;transition:color .15s}
.cat p{margin:0;font-size:15px;line-height:1.55}
.cat .count{display:block;margin-top:8px;font-size:13px;color:var(--muted)}
@media (max-width:900px){.cats{grid-template-columns:1fr 1fr}.cat:nth-child(n){padding-left:0;border-left:0}.cat:nth-child(2n){padding-left:24px;border-left:1px solid var(--line)}}
@media (max-width:560px){.cats{grid-template-columns:1fr}.cat:nth-child(n){padding-left:0;border-left:0}}

/* Popular */
.popular{display:grid;grid-template-columns:1.3fr 1fr 1fr;gap:16px}
.pop{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-lg);padding:24px;display:flex;flex-direction:column;color:inherit;min-height:170px;transition:border-color .15s}
.pop:hover{border-color:var(--brand);text-decoration:none}
.pop.feature{grid-row:span 2;background:var(--brand);border-color:var(--brand);color:var(--brand-ink)}
.pop.feature h3,.pop.feature p{color:var(--brand-ink)}
.pop.feature p{opacity:.85}
.pop h3{font-size:19px;font-weight:700;margin-bottom:6px}
.pop p{margin:0;font-size:15px;line-height:1.55}
.pop .foot{margin-top:auto;padding-top:18px;font-size:14px;font-weight:600;display:flex;justify-content:space-between;align-items:center}
.pop .soon{font-size:12px;font-weight:600;color:var(--amber-ink);background:var(--amber-soft);padding:3px 10px;border-radius:999px}
.feature-figure{margin:28px 0 8px;font-family:var(--head);font-weight:800;font-size:44px;letter-spacing:-.04em;line-height:1}
.feature-figure small{display:block;font-family:var(--sans);font-size:14px;font-weight:500;letter-spacing:0;opacity:.8;margin-top:8px}
@media (max-width:900px){.popular{grid-template-columns:1fr 1fr}.pop.feature{grid-row:auto;grid-column:span 2}}
@media (max-width:560px){.popular{grid-template-columns:1fr}.pop.feature{grid-column:auto}}

/* Guides */
.guides{display:grid;grid-template-columns:repeat(3,1fr);gap:28px}
.guide{color:inherit}
.guide:hover{text-decoration:none}
.guide:hover h3{text-decoration:underline;text-decoration-color:var(--brand);text-underline-offset:4px}
.guide-art{aspect-ratio:16/10;border-radius:var(--radius-lg);margin-bottom:16px;display:grid;place-items:center;overflow:hidden}
.guide .meta{font-size:13px;color:var(--muted);margin-bottom:6px}
.guide h3{font-size:19px;font-weight:700;line-height:1.35}
@media (max-width:860px){.guides{grid-template-columns:1fr}}

/* FAQ */
.faq-grid{display:grid;grid-template-columns:.8fr 1.2fr;gap:56px}
details{border-bottom:1px solid var(--line);padding:4px 0}
summary{list-style:none;cursor:pointer;padding:18px 40px 18px 0;font-family:var(--head);font-weight:600;font-size:18px;color:var(--ink);position:relative}
summary::-webkit-details-marker{display:none}
summary::after{content:"";position:absolute;right:6px;top:26px;width:10px;height:10px;border-right:2px solid var(--muted);border-bottom:2px solid var(--muted);transform:rotate(45deg);transition:transform .2s}
details[open] summary::after{transform:rotate(225deg);top:30px}
details p{margin:0 0 18px;max-width:62ch}
@media (max-width:860px){.faq-grid{grid-template-columns:1fr;gap:16px}.hero-grid{grid-template-columns:1fr;gap:40px}.hero{padding-top:40px}}

/* Ads */
.ad{border:1px dashed var(--line);background:var(--surface-2);border-radius:var(--radius);display:none;place-items:center;color:var(--muted);font-size:12px;letter-spacing:.02em;margin:32px 0}
.ad-leader{min-height:110px}
.ad-rect{min-height:260px}

/* Footer */
footer{background:var(--surface);border-top:1px solid var(--line);padding:56px 0 32px;margin-top:40px}
.foot-grid{display:grid;grid-template-columns:1.5fr repeat(3,1fr);gap:32px}
.foot-grid h4{font-size:14px;font-weight:700;margin-bottom:12px}
.foot-grid ul{list-style:none;margin:0;padding:0}
.foot-grid li{margin-bottom:6px}
.foot-grid a{color:var(--body);font-size:15px}
.foot-grid a:hover{color:var(--brand)}
.foot-bottom{margin-top:40px;padding-top:24px;border-top:1px solid var(--line);font-size:13px;color:var(--muted);display:flex;flex-wrap:wrap;gap:12px;justify-content:space-between}
@media (max-width:760px){.foot-grid{grid-template-columns:1fr 1fr}.foot-grid>div:first-child{grid-column:span 2}}

/* Calculator page */
.crumbs{font-size:14px;color:var(--muted);padding:24px 0 0}
.crumbs a{color:var(--muted)}
.crumbs span{margin:0 8px}
.calc-head{padding:16px 0 28px;max-width:760px}
.calc-head h1{font-size:clamp(32px,4.2vw,48px);font-weight:800;letter-spacing:-.035em;margin-bottom:10px}
.calc-head p{margin:0 0 12px;font-size:18px}
.stamp{display:flex;flex-wrap:wrap;gap:8px 20px;font-size:14px;color:var(--muted)}
.stamp span{display:inline-flex;align-items:center;gap:6px}
.stamp svg{color:var(--brand)}

.calc{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.1fr);gap:24px;align-items:start}
.panel{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-lg);padding:28px}
.inputs h2,.results h2{font-size:18px;font-weight:700;margin-bottom:20px}
.field{margin-bottom:22px}
.field-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:8px}
.field label,.field .lbl{font-size:15px;font-weight:600;color:var(--ink);display:inline-flex;align-items:center;gap:6px}
.tip{position:relative;display:inline-grid;place-items:center;width:18px;height:18px;border-radius:50%;background:var(--surface-2);color:var(--muted);font-size:12px;font-weight:700;border:0;padding:0}
.tip:hover::after,.tip:focus::after{content:attr(data-tip);position:absolute;bottom:26px;left:50%;transform:translateX(-50%);width:240px;background:var(--ink);color:var(--bg);font-size:13px;font-weight:400;line-height:1.5;padding:10px 12px;border-radius:8px;z-index:10;text-align:left}
.inbox{display:flex;align-items:center;height:50px;border:1px solid var(--line);border-radius:10px;background:var(--bg);padding:0 14px;transition:border-color .15s,box-shadow .15s}
.inbox:focus-within{border-color:var(--brand);box-shadow:0 0 0 4px var(--brand-soft)}
.inbox.err{border-color:#DC2626}
.inbox .affix{color:var(--muted);font-weight:500}
.inbox input,.inbox select{flex:1;border:0;background:transparent;font:inherit;font-weight:500;color:var(--ink);height:100%;min-width:0;font-variant-numeric:tabular-nums;padding:0 6px}
.inbox input:focus,.inbox select:focus{outline:none}
.field .range{margin-top:12px}
.errmsg{font-size:13px;color:#DC2626;margin-top:6px;display:none}
.errmsg.show{display:block}
.two{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:12px;min-width:0}
.two>*{min-width:0}
.two .inbox{min-width:0}
.seg{display:grid;grid-template-columns:repeat(4,1fr);gap:4px;background:var(--surface-2);border-radius:10px;padding:4px}
.seg button{border:0;background:transparent;border-radius:7px;padding:9px 4px;font-weight:600;font-size:14px;line-height:1.25;color:var(--body)}
.seg button[aria-pressed=true]{background:var(--surface);color:var(--ink);box-shadow:0 1px 3px rgba(0,0,0,.1)}
.more{border-top:1px solid var(--line);margin-top:8px;padding-top:6px}
.more summary{font-family:var(--sans);font-size:15px;padding:14px 30px 14px 0}
.more summary::after{top:20px}
.more[open] summary::after{top:24px}
.more .field:last-child{margin-bottom:6px}
.more{border-bottom:0}
.calc-actions{display:flex;gap:10px;margin-top:22px}

.results{position:sticky;top:calc(env(safe-area-inset-top,0px) + 84px)}
.result-main{background:var(--brand);color:var(--brand-ink);border-radius:16px;padding:24px 26px;margin:-4px -4px 24px}
.result-main .k{font-size:15px;font-weight:500;opacity:.85}
.result-main .v{font-family:var(--head);font-size:clamp(44px,5vw,60px);font-weight:800;letter-spacing:-.04em;line-height:1.05;font-variant-numeric:tabular-nums}
.result-main .s{font-size:14px;opacity:.85;margin-top:4px}
.breakdown{display:grid;grid-template-columns:180px 1fr;gap:24px;align-items:center}
.legend{list-style:none;margin:0;padding:0}
.legend li{display:flex;align-items:center;gap:10px;padding:7px 0;border-bottom:1px solid var(--line);font-size:15px}
.legend li:last-child{border:0}
.legend i{width:10px;height:10px;border-radius:3px;flex:none}
.legend b{margin-left:auto;color:var(--ink);font-variant-numeric:tabular-nums;font-weight:600}
.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);border:1px solid var(--line);border-radius:12px;overflow:hidden;margin-top:24px}
.stats div{background:var(--surface);padding:14px 16px}
.stats span{display:block;font-size:13px;color:var(--muted)}
.stats b{font-family:var(--head);font-size:18px;color:var(--ink);font-variant-numeric:tabular-nums}
@media (max-width:980px){.calc{grid-template-columns:1fr}.results{position:static}}
@media (max-width:600px){.two{grid-template-columns:1fr}}
@media (max-width:480px){.breakdown{grid-template-columns:1fr;justify-items:center}.legend{width:100%}.stats{grid-template-columns:1fr 1fr}.panel{padding:20px}.result-main{margin:0 0 20px}}

.chart-panel{margin-top:24px}
.chart-panel h2{font-size:18px;font-weight:700;margin-bottom:4px}
.chart-panel .sub{font-size:14px;color:var(--muted);margin:0 0 16px}
.chart-wrap{overflow-x:auto}
.chart-legend{display:flex;gap:18px;font-size:14px;margin-top:8px;flex-wrap:wrap}
.chart-legend span{display:inline-flex;align-items:center;gap:8px}
.chart-legend i{width:14px;height:3px;border-radius:2px}
#balanceChart text{fill:var(--muted);font-size:12px;font-family:var(--sans)}

.table-toggle{margin-top:20px}
.tbl-wrap{overflow-x:auto;margin-top:12px;max-height:420px;overflow-y:auto;border:1px solid var(--line);border-radius:12px}
table{width:100%;border-collapse:collapse;font-size:14px;font-variant-numeric:tabular-nums}
th,td{padding:10px 14px;text-align:right;white-space:nowrap}
th:first-child,td:first-child{text-align:left}
thead th{position:sticky;top:0;background:var(--surface-2);color:var(--ink);font-weight:600}
tbody tr:nth-child(even){background:color-mix(in srgb,var(--surface-2) 45%,transparent)}

.affiliate{display:flex;gap:20px;align-items:center;justify-content:space-between;flex-wrap:wrap;background:var(--amber-soft);border-radius:var(--radius-lg);padding:24px 28px;margin-top:24px}
.affiliate.sponsored{display:none}
.affiliate h3{font-size:19px;margin-bottom:4px;color:var(--ink)}
.affiliate p{margin:0;font-size:15px;color:var(--body)}
.affiliate small{display:block;font-size:12px;color:var(--muted);margin-top:6px}

/* Guide article */
.article-grid{display:grid;grid-template-columns:minmax(0,720px) 280px;gap:56px;justify-content:space-between;margin-top:56px}
.toc{position:sticky;top:calc(env(safe-area-inset-top,0px) + 90px)}
.toc h4{font-size:14px;margin-bottom:10px}
.toc ol{margin:0;padding:0 0 0 18px;font-size:15px}
.toc li{margin-bottom:6px}
.toc a{color:var(--body)}
.toc a:hover{color:var(--brand)}
.prose h2{font-size:28px;font-weight:700;margin:48px 0 14px}
.prose h2:first-child{margin-top:0}
.prose h3{font-size:20px;margin:28px 0 8px}
.prose p,.prose li{max-width:68ch}
.formula{background:var(--surface);border:1px solid var(--line);border-left:4px solid var(--brand);border-radius:10px;padding:18px 22px;font-family:var(--head);font-size:20px;color:var(--ink);font-weight:600;margin:20px 0;overflow-x:auto;white-space:nowrap}
.example{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:20px 24px}
.example dl{display:grid;grid-template-columns:1fr auto;gap:6px 20px;margin:0}
.example dt{color:var(--body)}
.example dd{margin:0;text-align:right;color:var(--ink);font-weight:600;font-variant-numeric:tabular-nums}
.example .total{border-top:1px solid var(--line);padding-top:8px;margin-top:4px}
@media (max-width:980px){.article-grid{grid-template-columns:1fr}.toc{position:static;order:-1;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:18px 20px}}

.related{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
@media (max-width:860px){.related{grid-template-columns:1fr 1fr}}
@media (max-width:480px){.related{grid-template-columns:1fr}}

/* Toast & cookie */
.toast{position:fixed;left:50%;bottom:calc(24px + env(safe-area-inset-bottom,0px));transform:translate(-50%,120px);background:var(--ink);color:var(--bg);padding:12px 20px;border-radius:10px;font-size:15px;font-weight:500;z-index:100;transition:transform .25s}
.toast.show{transform:translate(-50%,0)}
.cookie{position:fixed;left:16px;right:16px;bottom:0;padding-bottom:calc(16px + env(safe-area-inset-bottom,0px));z-index:90;display:none;justify-content:center}
.cookie.show{display:flex}
.cookie-box{max-width:760px;width:100%;background:var(--surface);border:1px solid var(--line);border-radius:16px;box-shadow:0 20px 50px -15px rgba(0,0,0,.35);padding:20px 22px;display:flex;gap:20px;align-items:center;flex-wrap:wrap}
.cookie-box p{margin:0;font-size:14px;flex:1 1 300px;line-height:1.55}
.cookie-box .btns{display:flex;gap:8px;flex-wrap:wrap}
.cookie-box .btn{padding:8px 14px;font-size:14px}

.view[hidden]{display:none}
.ad[hidden]{display:none}
.ads-disabled .ad{display:none!important}
.page-prose{max-width:720px;padding-bottom:40px}
.author{display:flex;gap:16px;align-items:flex-start;border-top:1px solid var(--line);margin-top:48px;padding-top:24px}
.author p{margin:4px 0 0;font-size:15px}
.prose ol li,.prose ul li{margin-bottom:8px}
.prose .affiliate{margin:28px 0}
.page-prose h2{font-size:24px;margin:40px 0 10px}
.contact-form{display:grid;gap:16px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-lg);padding:28px;margin-top:24px}
.contact-form label{font-weight:600;color:var(--ink);font-size:15px;display:block;margin-bottom:6px}
.contact-form input,.contact-form select,.contact-form textarea{width:100%;border:1px solid var(--line);border-radius:10px;background:var(--bg);color:var(--ink);font:inherit;padding:12px 14px}
.contact-form textarea{min-height:140px;resize:vertical}
.contact-form :is(input,select,textarea):focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 4px var(--brand-soft)}
.values{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin:24px 0}
.values div{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:18px 20px}
.values h3{font-size:17px;margin-bottom:4px}
.values p{margin:0;font-size:15px}
@media (max-width:600px){.values{grid-template-columns:1fr}}