/* aspectratiocalculator.app — Inter self-hosted, accent #2563eb, container 1120px *//* Aspect Ratio Calculator - airy off-white, cool grays, logo orange-yellow #2563eb (exactly the truck color): fills, icons, logo word; near-black text on it; warm tints. Inter (self-hosted variable font). */
@font-face{font-family:"Inter";font-style:normal;font-weight:100 900;font-display:swap;src:url(/fonts/inter-latin-wght.woff2) format("woff2")}
@font-face{font-family:"Inter Fallback";src:local("Arial");size-adjust:107.4%;ascent-override:90.2%;descent-override:22.5%;line-gap-override:0%}
:root{
--font:"Inter","Inter Fallback",system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
--bg:#f8fafc;--surface:#fff;--text:#0f172a;--muted:#64748b;--faint:#6b7280;
--line:#e2e8f0;--line2:#d1d5db;--tint:#f3f4f6;--sink:#eceef1;
--primary:#374151;--link:#0f172a;--crumb:#2563eb;--accent:#2563eb;--accent-hi:#3b82f6;--accent-press:#1d4ed8;--accent-ink:#0f172a;--accent-ic:#2563eb;--on-accent:#ffffff;--ring:rgba(249,142,42,.4);
--peach:#eff6ff;--peach2:#dbeafe;--peach-ln:#bfdbfe;
--ok:#15803d;--danger:#b91c1c;--danger-bg:#fef2f2;--danger-ln:#fecaca;
--ink:#0f172a;--ink2:#1f2937;--on-ink:#f8fafc;--on-ink-m:#9ca3af;--on-ink-ln:rgba(255,255,255,.1);
--panel-bg:#fff;--panel-ink:#0f172a;--panel-m:#6b7280;--panel-ln:#e2e8f0;--panel-card:#f8fafc;--panel-accent:#4b5563;
--advice-bg:#eff6ff;--advice-ln:#bfdbfe;--advice-ink:#1f1300;
--chip-on-bg:#2563eb;--chip-on-fg:#ffffff;
--dg1:#e2e8f0;--dg2:#f3f4f6;--dg3:#d1d5db;
--pad:16px;--r:20px;--r2:16px;--r3:12px;--head-h:60px;
--shadow:0 1px 2px rgba(17,24,39,.04),0 6px 20px rgba(17,24,39,.05);
--shadow-lg:0 2px 4px rgba(17,24,39,.04),0 16px 40px rgba(17,24,39,.09);
color-scheme:light}
@media (prefers-color-scheme:dark){:root:not([data-theme=light]){
--bg:#0c1117;--surface:#131a22;--text:#e9edf1;--muted:#a1acb8;--faint:#76828f;
--line:#222c37;--line2:#303c49;--tint:#101720;--sink:#0a0e12;
--primary:#c7d2de;--link:#2563eb;--crumb:#2563eb;--accent:#2563eb;--accent-hi:#3b82f6;--accent-press:#3b82f6;--accent-ink:#2563eb;--accent-ic:#2563eb;--on-accent:#ffffff;--ring:rgba(249,142,42,.4);
--peach:rgba(37,99,235,.18);--peach2:rgba(37,99,235,.28);--peach-ln:rgba(59,130,246,.45);
--ok:#4cc58a;--danger:#ff8f86;--danger-bg:#331a19;--danger-ln:#6a2d29;
--ink:#06090d;--ink2:#0d1319;
--panel-bg:linear-gradient(160deg,#1a2735 0%,#111b26 100%);--panel-ink:#f4f7fa;--panel-m:#9eabb8;--panel-ln:rgba(255,255,255,.12);--panel-card:rgba(255,255,255,.055);--panel-accent:#2563eb;
--advice-bg:rgba(249,142,42,.12);--advice-ln:rgba(249,142,42,.34);--advice-ink:#ffe2c4;
--chip-on-bg:#2563eb;--chip-on-fg:#ffffff;
--dg1:#2a3540;--dg2:#202a33;--dg3:#3a4755;
--shadow:none;--shadow-lg:0 18px 44px rgba(0,0,0,.45);color-scheme:dark}}
[data-theme=dark]{
--bg:#0c1117;--surface:#131a22;--text:#e9edf1;--muted:#a1acb8;--faint:#76828f;
--line:#222c37;--line2:#303c49;--tint:#101720;--sink:#0a0e12;
--primary:#c7d2de;--link:#2563eb;--crumb:#2563eb;--accent:#2563eb;--accent-hi:#3b82f6;--accent-press:#3b82f6;--accent-ink:#2563eb;--accent-ic:#2563eb;--on-accent:#ffffff;--ring:rgba(249,142,42,.4);
--peach:rgba(37,99,235,.18);--peach2:rgba(37,99,235,.28);--peach-ln:rgba(59,130,246,.45);
--ok:#4cc58a;--danger:#ff8f86;--danger-bg:#331a19;--danger-ln:#6a2d29;
--ink:#06090d;--ink2:#0d1319;
--panel-bg:linear-gradient(160deg,#1a2735 0%,#111b26 100%);--panel-ink:#f4f7fa;--panel-m:#9eabb8;--panel-ln:rgba(255,255,255,.12);--panel-card:rgba(255,255,255,.055);--panel-accent:#2563eb;
--advice-bg:rgba(249,142,42,.12);--advice-ln:rgba(249,142,42,.34);--advice-ink:#ffe2c4;
--chip-on-bg:#2563eb;--chip-on-fg:#ffffff;
--dg1:#2a3540;--dg2:#202a33;--dg3:#3a4755;
--shadow:none;--shadow-lg:0 18px 44px rgba(0,0,0,.45);color-scheme:dark}
*,*::before,*::after{box-sizing:border-box}
[hidden]{display:none!important}
html{scrollbar-gutter:stable;-webkit-text-size-adjust:100%;text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:84px}
html.lock{overflow:hidden}
body{position:relative;z-index:0;margin:0;background:var(--bg);color:var(--text);font:400 16px/1.65 var(--font);font-optical-sizing:auto;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;overflow-x:hidden;text-rendering:optimizeLegibility}
body::before{content:"";position:absolute;left:0;right:0;top:var(--head-h);height:500px;z-index:-1;pointer-events:none;background:radial-gradient(780px 300px at 0 0,color-mix(in srgb,var(--accent) 16%,transparent),transparent 68%)}
img,svg{max-width:100%}
img{height:auto}
a{color:var(--link);text-underline-offset:3px;text-decoration-line:underline;text-decoration-color:var(--accent);text-decoration-thickness:2px;overflow-wrap:anywhere}
a:hover{text-decoration-color:var(--accent-ic)}
h1,h2,h3,h4{font-family:var(--font);line-height:1.18;margin:0 0 .6em;color:var(--text);letter-spacing:-.022em;text-wrap:balance}
h1{font-size:clamp(1.85rem,5vw,2.8rem);font-weight:800;letter-spacing:-.03em;line-height:1.1}
h2{font-size:clamp(1.35rem,3.2vw,1.8rem);font-weight:700}
h3{font-size:1.1rem;font-weight:650;letter-spacing:-.012em}
p{margin:0 0 1em}
ul,ol{padding-left:1.25em;margin:0 0 1em}
li{margin:.3em 0}
b,strong{font-weight:650}
kbd{font:600 .72rem/1 var(--font);padding:3px 6px;border:1px solid var(--line2);border-bottom-width:2px;border-radius:6px;background:var(--surface);color:var(--muted)}
code{font:.9em ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;background:var(--tint);padding:1px 5px;border-radius:5px}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.skip{position:absolute;left:-999px;top:8px;background:var(--surface);padding:10px 14px;border-radius:10px;z-index:100;font-weight:600}
.skip:focus{left:8px}
:focus-visible{outline:3px solid var(--accent-ic);outline-offset:2px;border-radius:8px}
.wrap{max-width:1120px;margin:0 auto;padding:0 var(--pad)}
.ico{width:20px;height:20px;flex:none}

/* ---------- header ---------- */
.site-head{position:sticky;top:0;z-index:50;background:rgba(249,250,251,.86);-webkit-backdrop-filter:saturate(1.5) blur(14px);backdrop-filter:saturate(1.5) blur(14px);border-bottom:1px solid var(--line)}
@media (prefers-color-scheme:dark){:root:not([data-theme=light]) .site-head{background:rgba(11,15,20,.84)}}
[data-theme=dark] .site-head{background:rgba(11,15,20,.84)}
.head-in{display:flex;align-items:center;gap:12px;height:var(--head-h)}
.logo{display:flex;align-items:center;gap:10px;color:var(--text);text-decoration:none;font-weight:800;font-size:1.05rem;line-height:1;letter-spacing:-.03em;white-space:nowrap}
.site-head .logo{font-size:1.15rem;gap:8px;min-width:0}
.site-head .logo img{width:36px;height:36px}
.logo span{display:block;line-height:1}
.logo b,.logo .lg-c{font:inherit;font-weight:800;letter-spacing:inherit}
.logo .lg-c{color:var(--accent-ic);font-style:normal}
.logo img{width:38px;height:38px;border-radius:10px;flex:none;object-fit:contain}
.nav{display:none}
.head-act{display:flex;gap:8px;margin-left:auto;align-items:center}
.ib{position:relative;display:inline-grid;place-items:center;width:42px;height:42px;border:0;border-radius:12px;background:transparent;color:var(--text);cursor:pointer;padding:0;font:600 .85rem/1 var(--font);transition:background .15s,transform .1s}
.ib:active{transform:scale(.95)}
.ib .ico{width:22px;height:22px}

.ic-sun,.ic-x{display:none}
@media (prefers-color-scheme:dark){:root:not([data-theme=light]) .ic-moon{display:none}:root:not([data-theme=light]) .ic-sun{display:block}}
[data-theme=dark] .ic-moon{display:none}[data-theme=dark] .ic-sun{display:block}
[data-theme=light] .ic-moon{display:block}[data-theme=light] .ic-sun{display:none}
.nav-open .nav-tgl .ic-menu{display:none}.nav-open .nav-tgl .ic-x{display:block}
.theme{display:none}
.find{display:inline-grid;place-items:center;width:42px;height:42px;border:1px solid var(--line);border-radius:12px;background:var(--surface);color:var(--text);cursor:pointer;padding:0}
.find .find-t,.find kbd{display:none}
.find .ico{width:22px;height:22px}
@media (max-width:959px){.find{border:0;background:transparent}}
@media (hover:hover){.ib:hover{background:var(--tint)}.find:hover{background:var(--tint);border-color:var(--line2)}}

@media (max-width:959px){
  .site-head .logo{font-size:1.24rem}
  .head-act{gap:0}
  .head-act .find{margin-right:-8px}
  .head-act .find .ico,.head-act .nav-tgl .ico{width:26px;height:26px}
  .head-act .nav-tgl{place-items:center end}
  .head-act .nav-tgl .ico{transform:translateX(4px)}
  .head-in{gap:8px}
}
@media (max-width:420px){.site-head .logo{font-size:1.2rem;gap:7px}.site-head .logo img{width:34px;height:34px;border-radius:9px}.head-in{gap:6px}}
@media (max-width:380px){.site-head .logo{font-size:1.05rem}}
@media (max-width:350px){.logo span{display:none}}
/* desktop nav */
@media (min-width:960px){
.head-in{display:grid;grid-template-columns:1fr auto 1fr;column-gap:20px}
.site-head .logo{font-size:clamp(1.28rem,.72rem + .9vw,1.48rem);font-weight:800;gap:10px}
.site-head .logo .lg-c{font-weight:800}
.site-head .logo img{width:38px;height:38px}
.nav{display:flex;align-items:stretch;gap:2px;margin-left:0;justify-self:center;height:100%;transform:translateX(36px)}
.head-act{margin-left:0;justify-self:end}
.nav-dd{display:flex;align-items:center}
.nav-l{display:inline-flex;align-items:center;flex:none;white-space:nowrap;height:36px;padding:0 14px;border-radius:999px;color:var(--text);text-decoration:none;font-weight:650;font-size:.92rem;align-self:center}
.nav>.nav-l{align-self:center}
@media (hover:hover){.nav-l:hover{background:var(--peach);color:var(--accent-ink)}}
.nav-l[aria-current=page]{background:var(--accent);color:var(--on-accent)}
@media (hover:hover){.nav-l[aria-current=page]:hover{background:var(--accent-press);color:var(--on-accent)}}
.nav-chev{display:inline-grid;place-items:center;width:26px;height:36px;margin-left:-8px;border:0;background:transparent;color:var(--muted);cursor:pointer;padding:0;align-self:center;border-radius:0 999px 999px 0}
/* the link and its chevron are one pill: the highlight is drawn on the wrapper so the arrow sits inside the border */
.nav-dd{position:relative;align-self:center;height:36px;border-radius:999px;transition:background .15s}
.nav-dd>.nav-l{padding-right:2px;background:transparent!important;box-shadow:none!important}
.nav-dd>.nav-chev{margin-left:0;width:30px;border-radius:999px}
.nav-dd:has(>.nav-l[aria-current=page]){background:var(--accent)}
.nav-dd:has(>.nav-l[aria-current=page])>.nav-l,.nav-dd:has(>.nav-l[aria-current=page]) .nav-chev{color:var(--on-accent)}
@media (hover:hover){.nav-dd:hover,.nav-dd.open{background:var(--peach)}.nav-dd:hover>.nav-l,.nav-dd:hover .nav-chev{color:var(--accent-ink)}.nav-dd:has(>.nav-l[aria-current=page]):hover,.nav-dd.open:has(>.nav-l[aria-current=page]){background:var(--accent)}.nav-dd:has(>.nav-l[aria-current=page]):hover>.nav-l,.nav-dd:has(>.nav-l[aria-current=page]):hover .nav-chev,.nav-dd.open:has(>.nav-l[aria-current=page])>.nav-l,.nav-dd.open:has(>.nav-l[aria-current=page]) .nav-chev{color:var(--on-accent)}}
/* hover bridge so the pointer can reach the tools menu without the menu closing */
.nav-dd::after{content:"";position:absolute;left:0;right:0;top:100%;height:14px}
.nav-chev .ico{width:16px;height:16px;transition:transform .2s}
.nav-dd:hover .nav-chev .ico,.nav-dd.open .nav-chev .ico,.nav-dd:focus-within .nav-chev .ico{transform:rotate(180deg)}
.nav-pop{position:absolute;top:calc(100% + 8px);left:0;z-index:60;min-width:232px;padding:8px;background:var(--surface);border:1px solid var(--line);border-radius:16px;box-shadow:var(--shadow-lg);opacity:0;visibility:hidden;transform:translateY(-4px);transition:opacity .16s,transform .16s,visibility 0s .16s;pointer-events:none}
.nav-dd:hover .nav-pop,.nav-dd:focus-within .nav-pop,.nav-dd.open .nav-pop{opacity:1;visibility:visible;transform:none;transition-delay:0s;pointer-events:auto}
.nav-pop ul{list-style:none;margin:0;padding:0}
.nav-pop li{margin:0}
.nav-pop a{display:flex;align-items:center;gap:10px;padding:8px 10px;border-radius:10px;color:var(--text);text-decoration:none;font-weight:600;font-size:.92rem;white-space:nowrap}
.nav-pop a .ico{width:18px;height:18px;color:var(--accent-ic)}
.nav-pop a:hover,.nav-pop a:focus-visible{background:var(--peach)}
.nav-pop a[aria-current=page]{background:var(--peach)}

.find{width:auto;min-width:148px;justify-content:flex-start;display:inline-flex;align-items:center;gap:8px;padding:0 10px 0 12px;color:var(--muted);background:var(--surface)}
.find .ico{width:18px;height:18px;color:var(--faint)}
.find .find-t{display:inline;font-size:.92rem;font-weight:500;flex:1;text-align:left}
.find kbd{display:inline-block}
.theme{display:inline-grid}
.nav-tgl{display:none}
.mnav{display:none!important}
}
@media (min-width:1180px){.find{min-width:160px}}

/* mobile menu sheet */
.mnav{position:fixed;left:0;right:0;top:var(--head-h);bottom:0;z-index:49;background:var(--bg);overflow-y:auto;overscroll-behavior:contain;-webkit-overflow-scrolling:touch}
.mnav-in{padding:12px var(--pad) calc(40px + env(safe-area-inset-bottom));max-width:640px;margin:0 auto}
.mn-top{display:grid;gap:6px;margin-bottom:18px}
.mn-top a,.mn-drop summary{display:flex;align-items:center;justify-content:space-between;min-height:52px;padding:0 16px;border-radius:14px;background:var(--surface);border:1px solid var(--line);color:var(--text);text-decoration:none;font-weight:650;font-size:1.02rem}
.mn-drop{border-radius:14px}
.mn-drop summary{cursor:pointer;list-style:none}
.mn-drop summary::-webkit-details-marker{display:none}
.mn-drop summary .ico{transition:transform .2s}
.mn-drop[open] summary{border-radius:14px 14px 0 0}
.mn-drop[open] summary .ico{transform:rotate(180deg)}
.mn-drop ul{list-style:none;margin:0;padding:6px;background:var(--surface);border:1px solid var(--line);border-top:0;border-radius:0 0 14px 14px}
.mn-drop li{margin:0}
.mn-drop a{display:flex;align-items:center;justify-content:flex-start;gap:10px;min-height:44px;padding:0 12px;border:0;background:transparent;border-radius:10px;font-size:.95rem;font-weight:600;text-align:left}
.mn-drop a .ico{color:var(--accent-ic);width:18px;height:18px}
.mn-drop a[aria-current=page]{background:#eff6ff;border:1px solid #2563eb;color:#2563eb}
.mn-top>a .ico,.mn-drop summary .ico{color:var(--faint);width:18px;height:18px}
.mn-top>a[aria-current=page],.mn-drop[aria-current=page] summary{background:#eff6ff;border-color:#2563eb;color:#2563eb}
.mn-top>a[aria-current=page] .ico,.mn-drop[aria-current=page] summary .ico,.mn-drop a[aria-current=page] .ico{color:#2563eb}
@media (prefers-color-scheme:dark){:root:not([data-theme=light]) .mn-top>a[aria-current=page],:root:not([data-theme=light]) .mn-drop[aria-current=page] summary,:root:not([data-theme=light]) .mn-drop a[aria-current=page]{background:rgba(37,99,235,.18);border-color:#3b82f6;color:#93c5fd}:root:not([data-theme=light]) .mn-top>a[aria-current=page] .ico,:root:not([data-theme=light]) .mn-drop[aria-current=page] summary .ico,:root:not([data-theme=light]) .mn-drop a[aria-current=page] .ico{color:#93c5fd}}
[data-theme=dark] .mn-top>a[aria-current=page],[data-theme=dark] .mn-drop[aria-current=page] summary,[data-theme=dark] .mn-drop a[aria-current=page]{background:rgba(37,99,235,.18);border-color:#3b82f6;color:#93c5fd}
[data-theme=dark] .mn-top>a[aria-current=page] .ico,[data-theme=dark] .mn-drop[aria-current=page] summary .ico,[data-theme=dark] .mn-drop a[aria-current=page] .ico{color:#93c5fd}

.mn-foot{display:flex;flex-wrap:wrap;gap:8px;padding-top:6px}
.mn-foot .btn{flex:1 1 auto}

/* ---------- page frame ---------- */
.page{padding-top:16px;padding-bottom:56px}
main>.wrap:first-child{padding-top:12px;padding-bottom:56px}
.crumbs ol{display:flex;flex-wrap:nowrap;overflow-x:auto;scrollbar-width:none;gap:2px;list-style:none;padding:0;margin:4px 0 12px;font-size:.84rem;color:var(--faint);white-space:nowrap}
.crumbs ol::-webkit-scrollbar{display:none}
.crumbs li{margin:0}
.crumbs li:not(:last-child)::after{content:"›";margin:0 7px;opacity:.8;color:var(--faint)}
.crumbs a{color:var(--crumb);text-decoration:none;font-weight:400}
.crumbs a:hover{color:var(--crumb);text-decoration:underline;text-decoration-color:var(--accent)}
.crumbs [aria-current]{color:var(--text);font-weight:400}
.page-head{padding:2px 0 18px}
.page-head:has(+ .layout .ar-pills){padding-bottom:6px}
.page-head h1{margin-bottom:.4em}
.lede{font-size:1.1rem;line-height:1.6;color:var(--muted);max-width:64ch}

.content>.meta{margin:-6px 0 16px}
@media (max-width:759px){.page-head{padding-bottom:12px}.page-head .lede{font-size:1rem;line-height:1.55}.page-head h1{font-size:1.75rem}}
.meta{font-size:.86rem;color:var(--muted);margin:0}
.meta a{color:var(--muted)}
.layout{display:block}
@media (min-width:1080px){.layout:has(>.sidebar){display:grid;grid-template-columns:minmax(0,1fr) 336px;gap:28px;align-items:start}.layout:has(>.sidebar)>.content{padding-top:8px}.layout:has(>.sidebar)>.sidebar{margin-top:0}}
.content{min-width:0}
.og-fig{margin:18px 0 22px;max-width:68ch}
.returns{display:grid;grid-template-columns:minmax(0,1fr);gap:8px 36px;align-items:center}
.returns .og-fig,.pg-home #what-it-returns .og-fig{max-width:none;margin:0}
.returns .returns-copy p{max-width:none}
@media (min-width:800px){.returns{grid-template-columns:minmax(0,1.05fr) minmax(280px,.9fr)}}
.og-fig img{display:block;width:100%;height:auto;border:1px solid var(--line);border-radius:16px;background:var(--surface)}
.sidebar{display:none}
@media (min-width:1080px){.sidebar{display:block;position:relative}}
.side-box{background:var(--surface);border:1px solid var(--line);border-radius:var(--r2);padding:16px 14px;margin-bottom:16px}
.side-box h2{font-size:.72rem;letter-spacing:.1em;text-transform:uppercase;color:var(--faint);font-weight:650;margin:0 0 8px 6px}
.side-box ul{list-style:none;padding:0;margin:0}
.side-box li{margin:0}
.side-box a{display:flex;gap:10px;align-items:center;padding:8px 8px;border-radius:10px;text-decoration:none;color:var(--text);font-weight:550;font-size:.93rem;line-height:1.3}
.side-box a .ico{color:var(--faint);width:19px;height:19px}
@media (hover:hover){.side-box a:hover{background:var(--tint)}.side-box a:hover .ico{color:var(--accent-ic)}}

.top-slot .ccu{margin:12px 0}

.sec{margin:0 0 42px}
.sec>h2{padding-top:4px}
.sec p,.sec li{max-width:68ch;line-height:1.72}
.sec ul li::marker{color:var(--accent-ic)}
.sec ol li::marker{color:var(--muted);font-weight:650}
.band{padding:56px 0}
.band.alt{background:var(--surface)}

.sec-head{display:flex;align-items:baseline;justify-content:space-between;gap:12px;margin-bottom:20px;flex-wrap:wrap}
.sec-head h2{margin:0}
.sec-more{font-size:.93rem;font-weight:650;text-decoration:none;display:inline-flex;align-items:center;gap:6px}
.sec-more .ico{width:16px;height:16px;transition:transform .15s}
.sec-more:hover .ico{transform:translateX(3px)}
.res-list{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:minmax(0,1fr);gap:10px}
.res-list li{margin:0;min-width:0}
.res-row{display:flex;flex-direction:column;align-items:stretch;gap:4px;min-width:0;height:100%;padding:14px 16px;border:1px solid var(--line);border-radius:var(--r2);background:var(--surface);color:var(--text);text-decoration:none;-webkit-tap-highlight-color:transparent}
.res-top{display:flex;align-items:center;justify-content:space-between;gap:8px 12px;min-width:0}
.res-size{font-weight:720;font-size:1.05rem;letter-spacing:-.02em;font-variant-numeric:tabular-nums;min-width:0}
.res-end{display:inline-flex;align-items:center;gap:8px;flex:none;color:var(--muted);font-size:.82rem;font-variant-numeric:tabular-nums;white-space:nowrap}
.res-end .ico{width:16px;height:16px;color:var(--faint);transition:transform .15s,color .15s}
.res-use{color:var(--muted);font-size:.9rem;line-height:1.4}
@media (max-width:380px){.res-top{flex-wrap:wrap}.res-end{margin-left:auto}}
@media (min-width:760px){.res-list{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}}
@media (hover:hover){.res-row:hover{border-color:var(--accent);box-shadow:var(--shadow)}.res-row:hover .res-end .ico{transform:translateX(3px);color:var(--text)}}

/* ---------- buttons, chips ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:0 18px;min-height:46px;border:1px solid var(--line2);border-radius:var(--r3);background:var(--surface);color:var(--text);font:650 .95rem/1.2 var(--font);cursor:pointer;text-decoration:none;white-space:nowrap;transition:transform .12s,background .15s,border-color .15s,box-shadow .15s;-webkit-tap-highlight-color:transparent}
.btn .ico{width:18px;height:18px}

.btn:active{transform:translateY(1px) scale(.99)}
.btn:disabled{opacity:.6;cursor:progress}
@media (hover:hover){.btn:hover{background:var(--tint);border-color:var(--line2)}}
.chip{display:inline-flex;align-items:center;justify-content:center;flex:none;box-sizing:border-box;height:40px;min-height:40px;padding:0 14px;border:1px solid var(--line2);border-radius:999px;background:var(--surface);color:var(--text);font:650 .92rem/1 var(--font);cursor:pointer;white-space:nowrap;transition:background .15s,border-color .15s,color .15s;-webkit-tap-highlight-color:transparent}
.chip.on{background:var(--accent);border-color:var(--accent);color:var(--on-accent)}
@media (hover:hover){.chip:not(.on):hover{background:var(--peach);border-color:var(--accent);color:var(--accent-ink)}.chip.on:hover{background:var(--accent-press);border-color:var(--accent-press);color:var(--on-accent)}}

/* ---------- forms ---------- */
input,select,textarea{font-size:16px;color:var(--text)}

label{display:block;font-weight:600;font-size:.85rem;margin-bottom:7px;color:var(--text)}

select:not(.inp select){width:100%;min-height:50px;padding:0 12px;border:1px solid var(--line2);border-radius:14px;background:var(--surface);font-size:16px;font-weight:600}
input[type=text]:not(.inp input){width:100%;min-height:50px;padding:0 12px;border:1px solid var(--line2);border-radius:14px;background:var(--surface);font-size:16px}
input:not(.inp input):not(.find-top input):focus,select:not(.inp select):focus{outline:0;border-color:var(--accent)}

/* ---------- calculator ---------- */
.calc{margin:0 0 40px}

/* result panel */

.res-label{font-size:.74rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--panel-accent)}

@keyframes pop{0%{opacity:.4;transform:translateY(5px)}100%{opacity:1;transform:none}}

/* next steps */

.math{background:var(--surface);border:1px solid var(--line);border-radius:var(--r2);padding:0 18px;margin:0 0 22px}
.math summary{cursor:pointer;font-weight:650;padding:15px 0;list-style:none;display:flex;justify-content:space-between;align-items:center}
.math summary::-webkit-details-marker{display:none}
.math summary::after{content:"";width:16px;height:16px;background:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%238b95a1' stroke-width='2.4' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E") center/16px no-repeat;transition:transform .2s}
.math[open] summary::after{transform:rotate(180deg)}
.math[open]{padding-bottom:6px}
.math ol{margin:0 0 .6em;padding-left:1.3em}
.math li{margin:.55em 0;word-break:break-word;max-width:none}

/* mobile result dock */

/* ---------- content widgets ---------- */

.tbl-wrap{overflow-x:auto;margin:1.2em 0 1.6em;border:1px solid var(--line);border-radius:var(--r2);background:var(--surface);-webkit-overflow-scrolling:touch}
.tbl{border-collapse:separate;border-spacing:0;width:100%;min-width:420px;font-size:.92rem;font-variant-numeric:tabular-nums}
.tbl caption{caption-side:top;text-align:left;font-weight:700;padding:14px 14px 10px;letter-spacing:-.01em}
.tbl th,.tbl td{padding:10px 14px;border-bottom:1px solid var(--line);text-align:right;white-space:nowrap}
.tbl thead th{background:var(--tint);text-align:right;font-size:.7rem;font-weight:700;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);border-top:1px solid var(--line)}
.tbl th[scope=row],.tbl thead th:first-child{text-align:left;position:sticky;left:0;background:var(--surface);z-index:1;font-weight:650}
.tbl thead th:first-child{background:var(--tint)}
.tbl tbody tr:nth-child(even) td,.tbl tbody tr:nth-child(even) th[scope=row]{background:color-mix(in srgb,var(--tint) 55%,var(--surface))}
.tbl tbody tr:last-child>*{border-bottom:0}
@media (hover:hover){.tbl tbody tr:hover>*{background:var(--tint)!important}}
.tbl-note{font-size:.8rem;color:var(--muted);margin:0;padding:10px 14px;border-top:1px solid var(--line)}
.faq details{background:var(--surface);border:1px solid var(--line);border-radius:var(--r2);margin:0 0 10px;padding:0 16px;transition:border-color .15s}
.faq details[open]{border-color:var(--line2);box-shadow:var(--shadow)}
.faq summary{cursor:pointer;font-weight:650;padding:15px 0;list-style:none;display:flex;justify-content:space-between;align-items:center;gap:14px;line-height:1.4}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"";flex:none;width:22px;height:22px;border-radius:50%;background:var(--tint) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23566170' stroke-width='2.6' stroke-linecap='round'%3E%3Cpath d='M12 6v12M6 12h12'/%3E%3C/svg%3E") center/12px no-repeat;transition:transform .2s}
.faq details[open] summary::after{transform:rotate(45deg)}
.faq p{margin:0 0 16px;color:var(--muted);max-width:66ch}
.sources ul{font-size:.92rem}

.note-box{border:1px solid var(--peach-ln);border-radius:var(--r2);background:var(--peach);padding:14px 18px;margin:1.2em 0}
.cards{list-style:none;padding:0;margin:0 0 1em;display:grid;grid-template-columns:minmax(0,1fr);gap:10px}
@media (min-width:600px){.cards{grid-template-columns:repeat(auto-fill,minmax(236px,1fr));gap:14px}}
.cards li{margin:0}
.card{position:relative;display:grid;grid-template-columns:auto 1fr auto;grid-template-areas:"i t g" "i d g";column-gap:14px;row-gap:1px;align-items:center;height:100%;padding:14px;border:1px solid var(--line);border-radius:var(--r2);background:var(--surface);color:var(--text);text-decoration:none;-webkit-tap-highlight-color:transparent;transition:transform .18s,border-color .18s,box-shadow .18s}
.card-i{grid-area:i;display:grid;place-items:center;width:44px;height:44px;border-radius:12px;background:var(--peach);color:var(--accent-ic);transition:background .18s,color .18s}
.card-i .ico{width:24px;height:24px}
.card-t{grid-area:t;font-weight:680;letter-spacing:-.012em;line-height:1.3}
.card-go{grid-area:g;width:18px;height:18px;color:var(--faint);transition:transform .18s,color .18s}
.card-d{grid-area:d;font-size:.86rem;color:var(--muted);line-height:1.4}

@media (min-width:600px){.card{display:flex;flex-direction:column;align-items:flex-start;gap:6px;padding:18px}.card-i{margin-bottom:6px}.card-go{position:absolute;right:16px;top:20px}}
@media (hover:hover){.card:hover{border-color:var(--accent);transform:translateY(-2px);box-shadow:var(--shadow-lg)}.card:hover .card-i{background:var(--accent);color:var(--on-accent)}.card:hover .card-go{transform:translateX(3px);color:var(--text)}}

.toc-inline{background:var(--surface);border:1px solid var(--line);border-radius:var(--r2);padding:16px 18px;margin:0 0 30px}
.toc-inline h2{font-size:.72rem;letter-spacing:.1em;text-transform:uppercase;color:var(--faint)}
.toc-inline ol{margin:0;columns:2;column-gap:32px;padding-left:1.3em}
.toc-inline li{break-inside:avoid;margin:.35em 0}
.toc-inline a{color:var(--text);text-decoration:none;font-weight:550;font-size:.93rem}
.toc-inline a:hover{color:var(--link);text-decoration:underline}
@media (max-width:620px){.toc-inline ol{columns:1}}

/* ---------- home ---------- */
.hero{position:relative;overflow:hidden;background:transparent;color:var(--text);padding:26px 0 8px}
.hero .wrap{position:relative}
.hero h1{color:var(--text);font-size:clamp(1.85rem,3.2vw,2.4rem);font-weight:800;letter-spacing:-.03em;margin-bottom:.38em}
.hero-p{color:var(--muted);max-width:62ch;font-size:clamp(1.02rem,2.2vw,1.18rem);line-height:1.6;margin:0}
.hero .ar-nav,.calc-stage .ar-nav{margin:28px 0 32px}
.hero .ar-pills,.calc-stage .ar-pills{margin:0;row-gap:10px}
.hero .ar-tool,.calc-stage .ar-tool{margin:0}
/* calculator pages: title, lead and the gap down to the ratio tabs match the home hero */
.page-head:has(+ .calc-stage .ar-pills){padding-bottom:0}
.page-head:has(+ .calc-stage .ar-pills) h1{font-size:clamp(1.85rem,3.2vw,2.4rem);font-weight:800;letter-spacing:-.03em;line-height:1.1;margin-bottom:.38em}
.page-head:has(+ .calc-stage .ar-pills) .lede{margin:0;max-width:62ch;font-size:clamp(1.02rem,2.2vw,1.18rem);line-height:1.6;display:-webkit-box;-webkit-box-orient:vertical;-webkit-line-clamp:3;line-clamp:3;overflow:hidden;min-height:calc(1.6em * 3)}
@media (min-width:600px){.page-head:has(+ .calc-stage .ar-pills) .lede{-webkit-line-clamp:2;line-clamp:2;min-height:calc(1.6em * 2)}}
.calc-stage + .has-side>.content{padding-top:8px}
.calc-stage + .has-side>.sidebar{margin-top:0}
.guide-board{margin:4px 0 22px}
.guide-board h2{font-size:1.2rem;margin:0 0 12px}
.guide-note{margin:12px 0 0;color:var(--muted);font-size:.92rem;line-height:1.5;max-width:68ch}
.eq-list,.shape-row,.pair-num,.vs-grid,.pad-pair{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:minmax(0,1fr);gap:10px}
.sec .eq-list{margin:4px 0 1.15em}
.eq,.pair-card,.vs-card,.pad-card,.shape{min-width:0;border:1px solid var(--line);border-radius:var(--r2);background:var(--surface);color:var(--text)}
.eq,.pair-card,.pad-card{padding:16px 18px}
.eq-k{margin:0;font-size:.72rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--faint)}
.eq-f{margin:.4em 0 0;font-size:clamp(1.02rem,2.5vw,1.28rem);font-weight:750;letter-spacing:-.02em;line-height:1.3;overflow-wrap:anywhere}
.eq-x{margin:.45em 0 0;color:var(--muted);font-size:.9rem;line-height:1.45}
.euclid{list-style:none;margin:0;padding:0;border:1px solid var(--line);border-radius:var(--r2);background:var(--surface);overflow:hidden}
.euclid li{display:flex;align-items:baseline;justify-content:space-between;gap:12px;padding:11px 16px;border-bottom:1px solid var(--line);font-variant-numeric:tabular-nums}
.euclid li:last-child{border-bottom:0}
.euclid-ans b{font-size:1.15rem;letter-spacing:-.02em}
.shape{display:flex;flex-direction:column;align-items:center;gap:6px;padding:16px 10px 14px;text-align:center;text-decoration:none}
.shape-box{width:72px;height:72px;display:grid;place-items:center;color:var(--accent)}
.shape-svg{width:64px;height:64px}
.shape b{font-size:1.05rem;letter-spacing:-.02em}
.shape span{color:var(--muted);font-size:.82rem;line-height:1.35}
.pair-big{margin:.25em 0 0;font-size:clamp(1.45rem,4vw,1.9rem);font-weight:780;letter-spacing:-.03em;font-variant-numeric:tabular-nums;line-height:1.1}
.vs-card{display:flex;flex-direction:column;gap:2px;padding:16px 18px;text-decoration:none;height:100%}
.vs-size{font-weight:760;font-size:1.15rem;letter-spacing:-.02em;font-variant-numeric:tabular-nums}
.vs-ratio{font-weight:700;color:var(--accent-ink)}
.vs-mp,.vs-note{color:var(--muted);font-size:.9rem}
.pad-canvas{--aw:16;--ah:9;display:grid;place-items:center;width:min(100%,calc(220px * var(--aw) / var(--ah)));max-height:240px;aspect-ratio:var(--aw)/var(--ah);margin:12px auto 4px;background:var(--tint);border-radius:12px;padding:8px}
.pad-src{width:100%;aspect-ratio:16/9;display:grid;place-items:center;background:var(--accent);color:var(--on-accent);border-radius:6px;font-size:.8rem;font-weight:700;font-variant-numeric:tabular-nums}
@media (min-width:640px){.shape-row{grid-template-columns:repeat(2,minmax(0,1fr))}.pair-num,.pad-pair{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (min-width:800px){.eq-list{grid-template-columns:repeat(2,minmax(0,1fr))}.shape-row{grid-template-columns:repeat(4,minmax(0,1fr))}.vs-grid{grid-template-columns:repeat(3,minmax(0,1fr))}}
@media (hover:hover){.shape:hover,.vs-card:hover{border-color:var(--accent);box-shadow:var(--shadow)}}

@media (min-width:760px){.hero{padding:44px 0 12px}}
.hero-calc{position:relative;z-index:2;margin-top:12px;padding-bottom:12px}
@media (min-width:760px){.hero-calc{margin-top:16px}}

/* shape tabs: flat line icons, one hairline under the row, one orange bar for the active tab */

/* panel: heading, form and the dimension diagram. The diagram sits beside the form on wider screens so each box can be matched to its label on the drawing; on phones it sits between the heading and the form. */

@container (min-width:720px){.hgrid .fgrid2{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}.hgrid .fgrid2>.field>.inp{margin-bottom:16px}.hgrid .fgrid2>.field>.ctl{padding-bottom:16px}}

/* shape switcher above the calculator: light fill plus a thin outline, no separators */

/* calculator form: filled fields instead of outlined boxes, borderless chips, text-style Clear */

/* ---------- footer ---------- */
.site-foot{background:var(--surface);border-top:1px solid var(--line);color:var(--muted);padding:48px 0 56px;margin-top:24px}
.fgrid{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,212px),1fr));gap:30px 20px}
.fbrand{grid-column:1/-1}
@media (min-width:900px){.fgrid{grid-template-columns:1.5fr repeat(3,1fr);gap:30px}.fbrand{grid-column:auto}.fgrid>.fcol:last-child{padding-left:48px}}
@media (min-width:1100px){.fcol-2{padding-left:52px}.fgrid>.fcol:last-child{padding-left:96px}}
.fbrand .logo{color:var(--text);font-size:1.35rem}
.fbrand p{font-size:.9rem;line-height:1.6;margin:12px 0 10px}
.g-pref{display:inline-flex;align-items:center;gap:10px;margin:0;padding:8px 16px 8px 12px;border:1px solid #dadce0;border-radius:8px;background:#fff;color:#202124;font-size:14px;font-weight:500;line-height:1.25;text-decoration:none;transition:background-color .15s ease,box-shadow .15s ease}
.g-pref svg{width:18px;height:18px;flex:none;display:block}
.g-pref:hover{background:#f8f9fa;color:#202124;text-decoration:none;box-shadow:0 1px 2px rgba(60,64,67,.3),0 1px 3px 1px rgba(60,64,67,.15)}
.g-pref:active{background:#f1f3f4;color:#202124;box-shadow:none}
.g-pref:focus-visible{background:#f8f9fa;color:#202124;text-decoration:none;outline:2px solid #1a73e8;outline-offset:2px}
button.g-pref{font-family:inherit;cursor:pointer}
.f-install{display:flex;width:fit-content;margin-top:10px}
[data-theme=dark] .g-pref{background:#1a2430;color:var(--text);border-color:var(--line2)}
[data-theme=dark] .g-pref:hover,[data-theme=dark] .g-pref:focus-visible{background:#243040;color:var(--text);box-shadow:none}
[data-theme=dark] .g-pref:active{background:#141c26;color:var(--text);box-shadow:none}
@media (prefers-color-scheme:dark){:root:not([data-theme=light]) .g-pref{background:#1a2430;color:var(--text);border-color:var(--line2)}:root:not([data-theme=light]) .g-pref:hover,:root:not([data-theme=light]) .g-pref:focus-visible{background:#243040;color:var(--text);box-shadow:none}:root:not([data-theme=light]) .g-pref:active{background:#141c26;color:var(--text);box-shadow:none}}
.fbrand .btn{background:var(--surface)}
.fcol h2{font-size:.7rem;text-transform:uppercase;letter-spacing:.12em;color:var(--faint);font-weight:700;margin-bottom:12px}
.fcol ul{list-style:none;padding:0;margin:0}
.fcol-2 ul{display:grid;grid-template-columns:1fr 1fr;column-gap:18px}
.fcol li{margin:0}
.fcol a{display:inline-block;padding:5px 0;color:var(--text);text-decoration:none;font-size:.92rem;white-space:normal}
@media (max-width:899px){
  .fcol-2 ul{column-gap:16px}
}
.fcol a:hover{color:var(--accent-ink);text-decoration:underline}
.fcopy{font-size:.8rem;color:var(--faint);margin:30px 0 0;max-width:80ch;line-height:1.6}
.fcopy{margin-top:10px}
.fcopy a{color:var(--muted)}
.fbar{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:8px 24px;margin-top:30px;padding-top:16px;border-top:1px solid var(--line)}
.fbar .fcopy{margin:0}
@media (max-width:640px){.fbar .fcopy{padding-right:52px}}
.flinks{display:flex;flex-wrap:wrap;gap:4px 18px}
.flinks a{font-size:.8rem;color:var(--muted);text-decoration:none;padding:4px 0}
.flinks a:hover{color:var(--accent-ink);text-decoration:underline}

/* ---------- floating buttons, dialogs, toast ---------- */
.fab{position:fixed;right:max(14px,env(safe-area-inset-right));bottom:max(16px,env(safe-area-inset-bottom));display:flex;flex-direction:column;gap:10px;z-index:30;transition:bottom .25s}

.fab-b{position:relative;width:46px;height:46px;border-radius:50%;border:1px solid var(--line2);background:var(--surface);color:var(--text);display:grid;place-items:center;cursor:pointer;box-shadow:0 6px 20px rgba(16,22,29,.18);padding:0;-webkit-tap-highlight-color:transparent}
.fab-b .ico{width:21px;height:21px}
.fab-b:active{transform:scale(.94)}
.dlg{border:1px solid var(--line);border-radius:var(--r);padding:0;background:var(--surface);color:var(--text);width:min(480px,calc(100vw - 24px));max-height:86dvh;overflow:auto;box-shadow:var(--shadow-lg)}
.dlg::backdrop{background:rgba(6,9,13,.58);-webkit-backdrop-filter:blur(3px);backdrop-filter:blur(3px)}
.dlg[open]{animation:dlgin .22s cubic-bezier(.2,.8,.2,1)}
@keyframes dlgin{from{opacity:0;transform:translateY(14px) scale(.98)}to{opacity:1;transform:none}}
.dlg-h{display:flex;justify-content:space-between;align-items:center;padding:14px 16px 14px 20px;border-bottom:1px solid var(--line);position:sticky;top:0;background:var(--surface);z-index:1}
.dlg-h h2{margin:0;font-size:1.05rem}

.toc-list{list-style:none;margin:0;padding:8px 8px 18px}
.toc-list li{margin:0}
.toc-list a{display:flex;align-items:center;gap:12px;padding:10px 12px;border-radius:12px;color:var(--text);text-decoration:none;font-weight:550;line-height:1.3}
.toc-n{flex:none;display:inline-grid;place-items:center;width:28px;height:28px;border-radius:50%;background:var(--peach);color:var(--accent-ink);font:700 .78rem/1 var(--font);font-variant-numeric:tabular-nums}
.toc-t{min-width:0}
.toc-list a[aria-current]{background:var(--peach);color:var(--accent-ink);font-weight:650}
.toc-list a[aria-current] .toc-n{background:var(--accent);color:var(--on-accent)}
@media (hover:hover){.toc-list a:hover{background:var(--peach)}.toc-list a:hover .toc-n{background:var(--accent);color:var(--on-accent)}}
.toast{position:fixed;inset:calc(var(--head-h) + 12px) max(16px,env(safe-area-inset-right)) auto auto;z-index:80;display:flex;align-items:center;gap:8px;margin:0;width:max-content;max-width:min(360px,calc(100vw - 32px));height:auto;padding:10px 14px;border:1px solid var(--line);border-radius:12px;background:var(--surface);color:var(--text);font:600 .92rem/1.35 var(--font);text-align:left;box-shadow:var(--shadow-lg);pointer-events:none;animation:toastin .18s cubic-bezier(.2,.8,.2,1)}
.toast .ico{width:18px;height:18px;flex:none}
.toast-ok,.toast-ok .ico{color:var(--ok);border-color:var(--ok)}
.toast-ok{background:#f0fdf4}
.toast-warn,.toast-warn .ico{color:#b45309;border-color:#b45309}
.toast-warn{background:#fffbeb}
.toast-err,.toast-err .ico{color:var(--danger);border-color:var(--danger)}
.toast-err{background:var(--danger-bg)}
[data-theme=dark] .toast-ok{background:#10261a}
[data-theme=dark] .toast-warn,[data-theme=dark] .toast-warn .ico{color:#fbbf24;border-color:#fbbf24}
[data-theme=dark] .toast-warn{background:#3a2a10}
@media (prefers-color-scheme:dark){:root:not([data-theme=light]) .toast-ok{background:#10261a}:root:not([data-theme=light]) .toast-warn,:root:not([data-theme=light]) .toast-warn .ico{color:#fbbf24;border-color:#fbbf24}:root:not([data-theme=light]) .toast-warn{background:#3a2a10}}
.toast.is-out{animation:toastout .2s ease forwards}
@keyframes toastin{from{opacity:0;transform:translateY(-6px)}to{opacity:1;transform:none}}
@keyframes toastout{to{opacity:0;transform:translateY(-6px)}}
/* mobile bottom sheets */
@media (max-width:640px){
.dlg:not(.find-dlg){margin:auto 0 0;width:100%;max-width:none;border-radius:var(--r) var(--r) 0 0;max-height:88dvh;border-bottom:0;padding-bottom:env(safe-area-inset-bottom)}
.dlg:not(.find-dlg)[open]{animation:sheetin .3s cubic-bezier(.2,.8,.2,1)}
}
@keyframes sheetin{from{transform:translateY(100%)}to{transform:none}}

/* ---------- search dialog ---------- */
.find-dlg{padding:0;width:min(660px,calc(100vw - 24px));margin:10vh auto auto;max-height:min(72dvh,640px);overflow:hidden;border-radius:18px}
.find-dlg[open]{display:flex;flex-direction:column}
.find-top{display:flex;align-items:center;gap:10px;padding:6px 10px 6px 16px;border-bottom:1px solid var(--line);flex:none}
.find-top>.ico{color:var(--accent-ic);width:22px;height:22px}
.find-top input{flex:1;min-width:0;height:54px;border:0;outline:0;background:transparent;font:500 1.1rem/1 var(--font);color:var(--text);-webkit-appearance:none;appearance:none}
.find-top input::-webkit-search-cancel-button{display:none}
.find-x{flex:none;cursor:pointer}
.find-body{overflow-y:auto;overscroll-behavior:contain;padding:8px 8px 12px;flex:1;-webkit-overflow-scrolling:touch}
.find-h{font-size:.68rem;font-weight:700;letter-spacing:.11em;text-transform:uppercase;color:var(--faint);margin:12px 10px 6px}
.find-it{display:flex;align-items:center;gap:12px;padding:9px 10px;border-radius:12px;color:var(--text);text-decoration:none;min-height:56px}
.find-it .fi{display:grid;place-items:center;width:38px;height:38px;border-radius:11px;background:var(--peach);color:var(--accent-ic);flex:none}
.find-it .fi .ico{width:20px;height:20px}
.find-it .ft{display:flex;flex-direction:column;min-width:0;flex:1;line-height:1.3}
.find-it .ft b{font-weight:650;font-size:.97rem}
.find-it .ft small{color:var(--muted);font-size:.8rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.find-it .fk{flex:none;font-size:.66rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--faint);padding:3px 8px;border:1px solid var(--line);border-radius:999px}
.find-it[aria-selected=true]{background:var(--peach)}
.find-it[aria-selected=true] .fi{background:var(--accent);color:var(--on-accent)}
.find-it mark{background:var(--ring);color:inherit;border-radius:3px;padding:0 1px}
.find-empty{padding:30px 16px;text-align:center;color:var(--muted)}
.find-help{display:none;flex:none;margin:0;padding:9px 16px;border-top:1px solid var(--line);font-size:.76rem;color:var(--faint);background:var(--tint);gap:6px;align-items:center}
@media (hover:hover) and (min-width:700px){.find-help{display:flex}}
@media (max-width:640px){
.find-dlg{width:100%;max-width:none;height:100dvh;max-height:none;margin:0;border:0;border-radius:0}
.find-dlg[open]{animation:fadein .18s}
.find-top{padding-top:max(6px,env(safe-area-inset-top))}
.find-body{padding-bottom:calc(20px + env(safe-area-inset-bottom))}
}
@keyframes fadein{from{opacity:0}to{opacity:1}}

/* ---------- history, glossary ---------- */

.how-use{margin:48px 0 28px}
.related.related-tools{margin:0 0 36px}
.related.related-tools>.cards{margin-bottom:0}
.calc-stage:has(.ar-tool) + .layout>.content>.related.related-tools{margin-top:36px}
.calc-stage:has(.guide-board) .guide-board{margin-bottom:28px}
.related.related-tools + .how-use{margin-top:36px}
.related.related-tools + .meta{margin-top:0}
.how-use:has(+ .tool-ai){margin-bottom:0}
.how-use + .tool-ai{margin:20px 0 28px}
@media (max-width:759px){
  .how-use{margin-top:28px}
  .related.related-tools{margin-bottom:28px}
  .calc-stage:has(.ar-tool) + .layout>.content>.related.related-tools{margin-top:28px}
  .calc-stage:has(.guide-board) .guide-board{margin-bottom:20px}
  .related.related-tools + .how-use{margin-top:28px}
}
.how-use>h2{margin-bottom:4px}
.use-steps{display:grid;gap:12px;margin:16px 0 0;padding:0;list-style:none}
.use-steps li,.feat-grid li{margin:0;min-width:0;display:grid;grid-template-columns:auto minmax(0,1fr);grid-template-areas:"i t" "d d";column-gap:14px;row-gap:12px;align-items:center;background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:18px 18px 16px}
.use-steps h3,.feat-grid h3{grid-area:t;margin:0;font-size:1.05rem;line-height:1.3}
.use-steps .feat-i,.feat-grid .feat-i{grid-area:i}
.use-steps .feat-i{font-weight:750;font-size:1.35rem;font-variant-numeric:tabular-nums}
.use-steps p{grid-area:d}
.feat-grid .feat-d{grid-area:d;display:grid;gap:.75em}
.use-steps p,.feat-grid p{margin:0;max-width:none;color:var(--muted);font-size:.95rem;line-height:1.55}
.feat-grid .feat-d p{grid-area:auto}
@media (min-width:800px){.use-steps{grid-template-columns:repeat(3,minmax(0,1fr));align-items:stretch}}
.feat-grid{list-style:none;margin:16px 0 0;padding:0;display:grid;gap:12px}
.feat-i{display:grid;place-items:center;width:40px;height:40px;border-radius:12px;background:var(--peach);color:var(--accent-ic)}
.feat-i .ico{width:20px;height:20px}
.feat-lg .feat-i{width:44px;height:44px;border-radius:14px}
.feat-lg .feat-i .ico{width:22px;height:22px}
@media (min-width:800px){.feat-grid,.why-grid{grid-template-columns:repeat(3,minmax(0,1fr));align-items:stretch}}
@media (min-width:800px){.feat-grid.cols-2{grid-template-columns:repeat(2,minmax(0,1fr))}}

.pg-home .sec p{max-width:72ch}
.pg-home .hero{padding-bottom:0}
.pg-home .hero .ar-tool{margin-bottom:0}
.pg-home #how-to-use{margin:0;padding:36px 0 0}
.pg-home .related.related-tools{margin:0;padding:36px 0 0}
.pg-home .home-ai{padding-top:48px}
.pg-home .home-ai .tool-ai{margin:0}
.pg-home .band{padding:48px 0 0}
.pg-home .band>.wrap>.sec:last-child{margin-bottom:0}

.pg-home #how-to-use>.wrap>:last-child,.pg-home .band>.wrap>:last-child,.pg-home .band>.wrap>.sec:last-child>:last-child{margin-bottom:0}
.pg-home .band:last-child{padding-bottom:56px}
@media (max-width:759px){
  .pg-home #how-to-use,.pg-home .related.related-tools{padding-top:28px}
  .pg-home .home-ai{padding-top:28px}
  .pg-home .band{padding-top:28px}
  .pg-home .band:last-child{padding-bottom:36px}
  .pg-home .band>.wrap>.sec:not(:last-child){margin-bottom:24px}
}

/* ---------- sponsored units (containers exist only when data/ads.json mode != off) ---------- */
.ccu{margin:20px calc(var(--pad)*-1);padding:0;text-align:center}
.ccu-in{display:flex;justify-content:center;align-items:flex-start;overflow:hidden}

.ccu-ph{border:2px dashed var(--line2);color:var(--muted);padding:40px 20px;font-size:12px}
@media (min-width:760px){.ccu{margin-inline:0}}

.page-shell{display:block}
@media (min-width:1500px){.page-shell{display:grid;grid-template-columns:160px minmax(0,1120px) 160px;gap:16px;justify-content:center}.rail-col{position:sticky;top:84px;align-self:start;min-height:620px}.rail-col .ccu{margin:32px 0}
.page-shell .hero{width:100vw;margin-left:calc(50% - 50vw)}}
@media (max-width:1499px){.rail-col{display:none}}

@media (min-width:1100px){.ccu[data-place="in-2"]:not(.ccu-keep){display:none}}
@media (min-width:760px){.ccu[data-place="home-3"]{display:none}}
@media (max-width:1099px){.ccu[data-place="home-2"]:not(.ccu-keep){margin-top:24px}}
.ccu:has(ins.adsbygoogle[data-ad-status="unfilled"]){display:none}

@media print{body::before{display:none!important}.site-head,.site-foot,.fab,.ccu,.rail-col,.sidebar,.crumbs,.dlg,.toast,.skip{display:none!important}body{background:#fff;color:#000}.res-label{color:#444!important}.layout{display:block}.hero{background:#fff;color:#000;padding:0}.hero h1,.hero-p{color:#000}}
@media (prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;transition:none!important;animation:none!important}}

/* ---------- refinements ---------- */
@media (min-width:960px){.find{border-radius:999px;padding:0 14px 0 16px}.find kbd{border-radius:999px}}
.page-head h1{letter-spacing:-.035em}
.side-box,.card,.faq details,.math,.tbl-wrap,.toc-inline,.note-box{border-color:var(--line)}

label{letter-spacing:.005em}
.side-box h2,.toc-inline h2,.find-h{color:var(--faint)}
.tbl thead th{background:var(--tint)}
.faq summary:hover{color:var(--accent-ink)}

/* ---------- aligned fields: labels share a row, inputs share a row ---------- */
label{display:flex;align-items:center;gap:8px;line-height:1.3}

/* quick examples: hidden for now. Set display back to flex to show the strip. */

/* ---------- share dialog ---------- */
.dlg-h h2{display:flex;align-items:center;gap:10px}
.dlg-h h2 .ico{color:var(--accent-ic)}
.share-dlg{width:min(460px,calc(100vw - 24px));border-radius:24px}
.share-body{display:grid;gap:16px;padding:16px 20px 24px}
.share-prev{padding:14px 16px;border-radius:16px;background:var(--tint);border:1px solid var(--line)}
.share-prev p{margin:0 0 6px;font-size:.93rem;line-height:1.5;color:var(--text)}
.share-prev a{display:block;font-size:.88rem;font-weight:600;color:var(--accent-ink);text-decoration:none;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.share-grid{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:20px 4px;padding:4px 0 0}
.sh{display:flex;flex-direction:column;align-items:center;gap:8px;padding:0;border:0;background:none;color:var(--muted);text-decoration:none;cursor:pointer;font:500 .76rem/1.2 var(--font);-webkit-tap-highlight-color:transparent;min-width:0}
.sh-t{max-width:100%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.sh-i{display:grid;place-items:center;width:52px;height:52px;border-radius:50%;background:var(--b);color:var(--on,#fff);transition:transform .15s,filter .15s}
.sh-i .ico{width:24px;height:24px}

.sh:active .sh-i{transform:scale(.93)}
@media (hover:hover){.sh:hover .sh-i{transform:translateY(-2px);filter:brightness(1.08)}.sh:hover{color:var(--text)}}
@media (max-width:380px){.share-grid{gap:18px 0}.sh-i{width:48px;height:48px}}

/* ---------- FAB: share + page contents (hover card on mouse devices) ---------- */
.fab-b{transition:border-color .15s,color .15s,transform .1s,box-shadow .15s}
@media (hover:hover){.fab-b:hover,.fab-toc.open .fab-b{border-color:var(--accent-ic);color:var(--accent-ic)}}
.fab-toc{position:relative}
.toc-pop{position:absolute;right:100%;bottom:0;padding-right:10px;width:min(320px,calc(100vw - 28px));opacity:0;visibility:hidden;transform:translateX(6px);transition:opacity .16s,transform .16s,visibility 0s .16s;pointer-events:none}
.toc-pop-in{background:var(--surface);border:1px solid var(--line);border-radius:20px;box-shadow:var(--shadow-lg);padding:14px 8px 8px;max-height:min(62dvh,520px);overflow:auto;overscroll-behavior:contain}
.toc-pop-h{margin:0 12px 6px;font-size:.68rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--faint)}
.toc-pop ul{list-style:none;margin:0;padding:0}
.toc-pop a{display:block;padding:9px 12px;border-radius:12px;color:var(--text);text-decoration:none;font-size:.92rem;font-weight:500;line-height:1.3;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.toc-pop a[aria-current]{color:var(--accent-ink);font-weight:650}
@media (hover:hover) and (pointer:fine){
  .fab-toc:not(.quiet):hover .toc-pop,.fab-toc:not(.quiet):focus-within .toc-pop,.fab-toc.open .toc-pop{opacity:1;visibility:visible;transform:none;transition-delay:0s;pointer-events:auto}
  .toc-pop a:hover,.toc-pop a:focus-visible{background:var(--peach);color:var(--accent-ink)}
}
@media not all and (hover:hover) and (pointer:fine){.toc-pop{display:none}}

/* search: 1px accent border, no ring */
.find-top{gap:12px;padding:8px 12px 8px 16px;padding-top:max(8px,env(safe-area-inset-top))}
.find-top input{height:44px;padding:0 4px;border:0;border-radius:0;background:transparent;box-shadow:none;font-size:1.05rem}
.find-top input:focus,.find-top input:focus-visible{outline:0;box-shadow:none;border:0}
.find-dlg:focus,.find-dlg:focus-visible{outline:0}
@media (min-width:960px){.find{border-color:var(--accent);height:38px}}
@media (hover:hover) and (min-width:960px){.find:hover{border-color:var(--accent)}}
@media (min-width:960px) and (max-width:1179px){.find{min-width:0;width:38px;padding:0;gap:0;justify-content:center}.find .find-t,.find kbd{display:none}}
.band>.wrap>p{max-width:68ch}

/* ---------- homepage sections: one page colour, no rules between modules ---------- */
.band,.band.alt{background:transparent;border:0}
.who-lead{max-width:68ch;color:var(--muted);margin:0 0 18px}
.who-list{display:flex;flex-direction:column;gap:16px;margin:0;padding:0;list-style:none}
.who-row{display:grid;grid-template-columns:minmax(0,1fr);gap:14px;align-items:center;margin:0;background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:12px}
.who-fig{margin:0;background:transparent}
.who-fig img{display:block;width:100%;height:auto;aspect-ratio:4/3;object-fit:contain;filter:drop-shadow(0 10px 18px rgba(15,23,42,.14))}
@media (prefers-color-scheme:dark){:root:not([data-theme=light]) .who-fig img{filter:drop-shadow(0 12px 22px rgba(0,0,0,.45))}}
[data-theme=dark] .who-fig img{filter:drop-shadow(0 12px 22px rgba(0,0,0,.45))}
.who-copy h3{margin:0 0 .4em;font-size:clamp(1.15rem,2vw,1.35rem)}
.who-copy p{margin:0;color:var(--muted);font-size:.98rem;line-height:1.6;text-wrap:pretty}
@media (min-width:800px){
  .who-list{gap:20px}
  .who-row{grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:32px;padding:16px 20px}
  .who-row.flip .who-fig{order:2}
  .who-copy{padding:6px 12px}
}
.site-foot{margin-top:0}
body:not(.pg-home) #main{padding-bottom:56px}

/* AI summarize block */
.ai-sum{display:flex;flex-direction:column;align-items:stretch;background:color-mix(in srgb,var(--accent) 4%,var(--surface));border:1px solid color-mix(in srgb,var(--accent) 18%,var(--line));border-radius:var(--r2);padding:16px 14px;margin:0 0 16px}
.ai-t{display:flex;align-items:center;gap:6px;margin:0 0 8px 6px;font-size:.72rem;font-weight:650;letter-spacing:.1em;text-transform:uppercase;color:var(--faint)}
.ai-t .ico{width:15px;height:15px;color:var(--faint)}
.ai-l{display:flex;flex-direction:column;gap:2px}
.tool-ai{margin:20px 0 28px}
.tool-ai .ai-sum{flex-direction:row;flex-wrap:nowrap;align-items:center;gap:2px 4px;padding:8px 8px 8px 16px;margin:0}
.tool-ai .ai-t{margin:0 8px 0 0;flex:none}
.tool-ai .ai-l{flex-direction:row;flex-wrap:nowrap;min-width:0}
.ai-b{display:flex;gap:8px;align-items:center;min-height:40px;padding:7px 10px;border:1px solid transparent;border-radius:999px;background:transparent;color:var(--text);font:550 .93rem/1.2 var(--font);text-decoration:none;transition:background .16s ease,border-color .16s ease,box-shadow .16s ease,color .16s ease}
.ai-b .ico{width:18px;height:18px;flex:none;color:var(--text);transition:color .16s ease}
.ai-b:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.ai-b:active{background:color-mix(in srgb,var(--accent) 14%,var(--surface));box-shadow:none}
@media (hover:hover){
  .ai-b:hover{background:var(--surface);border-color:color-mix(in srgb,var(--accent) 32%,var(--line2));box-shadow:0 1px 2px rgba(15,23,42,.05),0 8px 18px color-mix(in srgb,var(--accent) 18%,transparent);color:var(--text)}
  .ai-b:hover .ico{color:var(--accent)}
}
@media (hover:hover) and (prefers-color-scheme:dark){
  :root:not([data-theme=light]) .ai-b:hover{background:color-mix(in srgb,var(--accent) 20%,var(--surface));border-color:color-mix(in srgb,var(--accent) 48%,var(--line2));box-shadow:0 8px 18px rgba(0,0,0,.32)}
}
@media (hover:hover){[data-theme=dark] .ai-b:hover{background:color-mix(in srgb,var(--accent) 20%,var(--surface));border-color:color-mix(in srgb,var(--accent) 48%,var(--line2));box-shadow:0 8px 18px rgba(0,0,0,.32)}}
@media (max-width:699px){
  .tool-ai .ai-sum,.layout>.sidebar>.ai-sum{flex-direction:column;align-items:stretch;gap:4px;padding:12px 12px 8px}
  .tool-ai .ai-t,.layout>.sidebar>.ai-sum>.ai-t{margin:0 4px 2px}
  .tool-ai .ai-l,.layout>.sidebar>.ai-sum>.ai-l{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:4px;width:100%}
  .tool-ai .ai-b,.layout>.sidebar>.ai-sum .ai-b{justify-content:center;gap:6px;min-width:0;padding:8px 4px;font-size:.8rem}
  .tool-ai .ai-b span,.layout>.sidebar>.ai-sum .ai-b span{white-space:nowrap}
  .tool-ai .ai-b .ico,.layout>.sidebar>.ai-sum .ai-b .ico{width:16px;height:16px}
}
@media (max-width:389px){
  .tool-ai .ai-l,.layout>.sidebar>.ai-sum>.ai-l{grid-template-columns:1fr}
  .tool-ai .ai-b,.layout>.sidebar>.ai-sum .ai-b{justify-content:flex-start;padding:8px 10px;font-size:.93rem}
}
@media (min-width:700px) and (max-width:1079px){
  .layout>.sidebar>.ai-sum{flex-direction:row;flex-wrap:nowrap;align-items:center;gap:4px;padding:8px 8px 8px 16px}
  .layout>.sidebar>.ai-sum>.ai-t{margin:0 8px 0 0;flex:none}
  .layout>.sidebar>.ai-sum>.ai-l{flex-direction:row;flex-wrap:nowrap}
}
@media (max-width:1079px){
  .layout:has(.ai-sum){display:flex;flex-direction:column}
  .layout:has(.ai-sum)>.sidebar{display:block;margin:8px 0 16px}
  body.pg-guide .layout:has(.ai-sum)>.sidebar{order:-1}

.layout:has(.ai-sum)>.sidebar .side-box{display:none}
}
@media print{.ai-sum{display:none!important}}

/* ---------- aspect-ratio tool ---------- */
.wrap{max-width:1120px}
.ib,.fab-b{min-width:44px;min-height:44px}
@media (max-width:959px){.head-act .ib,.head-act .find{width:40px;min-width:40px;height:44px;min-height:44px}}
.ar-tool{position:relative;background:var(--surface);border:1px solid var(--line);border-radius:var(--r);box-shadow:var(--shadow);overflow:hidden;margin:0 0 32px}
.ar-modes{display:grid;grid-template-columns:1fr 1fr;gap:4px;margin:14px 26px 0;padding:4px;border:0;border-radius:14px;background:var(--sink)}
.ar-mode{box-sizing:border-box;display:flex;align-items:center;justify-content:center;min-height:42px;margin:0;padding:8px 12px;border:0;border-radius:10px;background:transparent;color:var(--text);font:550 .9rem/1.25 var(--font);text-align:center;cursor:pointer;-webkit-tap-highlight-color:transparent;transition:background .15s,box-shadow .15s}
.ar-mode.on{background:var(--surface);color:var(--text);font-weight:650;box-shadow:0 1px 2px rgba(15,23,42,.08),0 0 0 1px var(--line)}
@media (prefers-color-scheme:dark){:root:not([data-theme=light]) .ar-mode.on{background:#243040;box-shadow:0 1px 2px rgba(0,0,0,.4),0 0 0 1px #3d4d5e}}
[data-theme=dark] .ar-mode.on{background:#243040;box-shadow:0 1px 2px rgba(0,0,0,.4),0 0 0 1px #3d4d5e}
@media (hover:hover){
  .ar-mode:not(.on):hover{background:transparent}
  .ar-mode.on:hover{background:var(--surface)}
}
.ar-mode:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
@media (min-width:900px){.ar-modes{margin-inline:30px}}
@media (max-width:699px){.ar-modes{margin:12px 26px 0;padding:3px}.ar-mode{padding:8px 4px;font-size:.75rem}}
.ar-nav{position:relative}
.ar-pills{display:flex;flex-wrap:nowrap;gap:8px;overflow-x:auto;scrollbar-width:none;margin:0 0 12px;padding:2px 0 6px;background:none;border:0;scroll-padding-inline:72px;-webkit-overflow-scrolling:touch;overscroll-behavior-x:contain}
.ar-pills::-webkit-scrollbar{display:none}
.ar-nav-btn{display:flex;position:absolute;z-index:2;align-items:center;top:0;bottom:6px;width:112px;height:auto;margin:0;place-items:center;border:0;border-radius:0;background:transparent;box-shadow:none;color:var(--text);cursor:pointer;padding:0;-webkit-tap-highlight-color:transparent;touch-action:manipulation}
.ar-nav-btn::before{content:"";position:absolute;inset:-12px 0 -6px;z-index:0;pointer-events:none;-webkit-backdrop-filter:blur(16px) saturate(1.35);backdrop-filter:blur(16px) saturate(1.35)}
.ar-nav-btn.prev{left:0;justify-content:flex-start}
.ar-nav-btn.next{right:0;justify-content:flex-end}
.ar-nav-btn.prev::before{background:linear-gradient(90deg,var(--bg) 0,var(--bg) 34%,color-mix(in srgb,var(--bg) 72%,transparent) 58%,transparent 100%);-webkit-mask-image:linear-gradient(90deg,#000 0,#000 38%,transparent 100%);mask-image:linear-gradient(90deg,#000 0,#000 38%,transparent 100%)}
.ar-nav-btn.next::before{background:linear-gradient(270deg,var(--bg) 0,var(--bg) 34%,color-mix(in srgb,var(--bg) 72%,transparent) 58%,transparent 100%);-webkit-mask-image:linear-gradient(270deg,#000 0,#000 38%,transparent 100%);mask-image:linear-gradient(270deg,#000 0,#000 38%,transparent 100%)}
.ar-nav-btn .ico{position:relative;z-index:1;width:28px;height:28px}
.ar-nav-btn:active .ico{transform:scale(.92)}
@media (hover:hover){.ar-nav-btn:hover{color:var(--text)}.ar-nav-btn:hover .ico{color:var(--accent-ink)}}
/* phones: the row runs to the screen edges, with a wider fade */
@media (max-width:899px){
  .hero .ar-nav,.calc-stage .ar-nav{margin-inline:calc(var(--pad) * -1)}
  .ar-pills{padding-inline:max(var(--pad),env(safe-area-inset-left)) max(var(--pad),env(safe-area-inset-right));scroll-padding-inline:88px}
  .ar-nav-btn{width:128px}
  .ar-nav-btn .ico{width:36px;height:36px}
  .ar-nav-btn.prev{padding-left:4px}
  .ar-nav-btn.next{padding-right:4px}
}
@media (hover:hover) and (pointer:fine){
  .ar-pills.can-left,.ar-pills.can-right{cursor:grab}
  .ar-pills.is-drag{cursor:grabbing;user-select:none}
  .ar-pills.is-drag .ar-pill{pointer-events:none}
}
.fab.fab-hold{opacity:0;pointer-events:none}
.ar-pill{display:inline-flex;align-items:center;justify-content:center;gap:6px;flex:none;box-sizing:border-box;height:40px;min-height:40px;padding:0 14px;border:1px solid var(--line2);border-radius:999px;background:var(--surface);color:var(--text);text-decoration:none;font-weight:650;font-size:.92rem;line-height:1;white-space:nowrap;-webkit-tap-highlight-color:transparent}
.ar-pill .ico{width:16px;height:16px}
.ar-pill .ratio-mark{flex:none;width:22px;height:22px;max-width:none;display:block}
.ar-pill.on,.ar-pill[aria-current=page]{background:var(--accent);border-color:var(--accent);color:var(--on-accent)}
.ar-pill.on .ico,.ar-pill[aria-current=page] .ico{color:var(--on-accent)}
@media (hover:hover){.ar-pill:not(.on):not([aria-current=page]):hover{text-decoration:none;background:var(--peach);border-color:var(--accent);color:var(--accent-ink)}.ar-pill.on:hover,.ar-pill[aria-current=page]:hover{background:var(--accent-press);border-color:var(--accent-press);color:var(--on-accent)}}

.ar-units{display:flex;flex-wrap:wrap;gap:8px;margin:10px 0 0}
.ex-modes{display:flex;flex-direction:column;align-items:flex-start;gap:8px;margin:0 0 14px}
.ex-modes .ar-units{margin:0}
.ar-note{margin:.45em 0 0;color:var(--muted);font-size:.92rem;font-weight:650;line-height:1.4}
.ex-same{grid-column:1/-1}
.ex-same .res-label{margin:0 0 8px}
.ex-picks{display:grid;grid-template-columns:repeat(auto-fill,minmax(148px,1fr));gap:8px;margin:0;padding:0}
.ex-picks .chip{width:100%}
.extra-tool .ex-lines{display:grid;gap:2px;margin-top:8px}
.extra-tool .ex-lines.ex-pair{display:flex;flex-wrap:wrap;align-items:baseline;gap:4px 16px}
.extra-tool .ex-lines p{margin:0;color:var(--muted);font-weight:650;line-height:1.35;font-variant-numeric:tabular-nums}
.extra-tool .ex-lines p:empty{display:none}
.extra-tool .ar-fields[data-n="5"]{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}
.extra-tool .ar-fields[data-n="5"]>.ar-field:first-child{grid-column:1/-1}
.extra-tool .ar-fields[data-n="5"]>.ar-field:last-child{grid-column:auto}
.res-label{margin:0;font-size:.78rem;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--faint)}
.ar-res-h{display:flex;align-items:center;justify-content:space-between;gap:12px;min-height:44px;margin:0 0 8px}
.ar-res-h .ar-ico-row{flex:none}
.ar-field{align-items:stretch}

.ar-grid{display:grid;grid-template-columns:minmax(0,1fr);gap:20px;padding:24px 26px 26px}
@media (min-width:900px){.ar-grid{grid-template-columns:minmax(0,1.05fr) minmax(280px,.95fr);padding:26px 30px 30px;align-items:start;gap:28px}}
.ar-tool[data-layout="linked"] .ar-grid{grid-template-columns:minmax(0,1fr);padding-top:24px;padding-bottom:40px}
@media (min-width:900px){
  .ar-tool[data-layout="linked"] .ar-grid{grid-template-columns:minmax(0,1.08fr) minmax(300px,.92fr);max-width:none;align-items:stretch;gap:24px;padding:36px 30px 40px}
  .ar-tool[data-layout="linked"] .ar-in-col{display:flex;flex-direction:column;justify-content:center;min-height:0}
  .ar-tool[data-layout="linked"] .ar-fields{row-gap:26px}
  .ar-tool[data-layout="linked"] .ar-out-col{position:relative;min-height:0}
  .ar-tool[data-layout="linked"] .shape-vis{position:absolute;inset:0;display:flex;height:auto}
  .ar-tool[data-layout="linked"] .shape-stage{flex:1;width:100%;height:100%;min-height:0;max-width:none;max-height:none;aspect-ratio:auto;margin:0;padding:10px}
}
.ar-fields{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:18px 20px;align-items:end}
.ar-field{display:flex;flex-direction:column;gap:8px;min-width:0;margin:0}
.ar-field span{font-size:1rem;font-weight:750;color:var(--text);line-height:1.2}
.ar-ctl{position:relative;display:flex;align-items:stretch;gap:6px}
.ar-inwrap{position:relative;flex:1;min-width:0}
.ar-field input{width:100%;min-width:0;box-sizing:border-box;border:1px solid var(--accent);border-radius:12px;background:var(--surface);color:var(--text);font-size:16px;font-weight:650;font-variant-numeric:tabular-nums;padding:0 40px 0 12px;min-height:48px;-moz-appearance:textfield;appearance:textfield}
.ar-field input::-webkit-outer-spin-button,.ar-field input::-webkit-inner-spin-button{-webkit-appearance:none;margin:0}
.ar-spin{display:flex;flex-direction:column;flex:none;width:32px;border:1px solid var(--line2);border-radius:10px;overflow:hidden;background:var(--surface)}
.ar-step{flex:1;margin:0;padding:0;border:0;background:transparent;color:var(--text);font:650 1rem/1 var(--font);cursor:pointer;-webkit-tap-highlight-color:transparent}
.ar-step+.ar-step{border-top:1px solid var(--line)}
@media (hover:hover){.ar-step:hover{background:var(--peach);color:var(--accent-ink)}}
.ar-step:active{background:var(--peach2)}
.ar-field input:focus,.ar-field input:focus-visible{outline:none;border-width:2px;padding:0 39px 0 11px}
.ar-field.bad input,.ar-field.bad input:focus,.ar-field.bad input:focus-visible{border-color:var(--danger)}
.ar-x{position:absolute;top:50%;right:8px;transform:translateY(-50%);width:28px;height:28px;min-width:28px;min-height:28px;border:0;border-radius:999px;background:transparent;color:var(--muted);display:grid;place-items:center;cursor:pointer;padding:0}
.ar-x .ico{width:16px;height:16px}
@media (hover:hover){.ar-x:hover{background:var(--tint);color:var(--text)}}

.extra-tool .ar-grid{grid-template-columns:minmax(0,1fr)}
@media (min-width:900px){
  .extra-tool:not(.is-stack) .ar-grid{grid-template-columns:minmax(0,1.35fr) minmax(240px,.72fr);align-items:stretch}
  .extra-tool:not(.is-stack) .ar-out-col{height:100%}
  .extra-tool:not(.is-stack) .ar-res{flex:1}
}
.extra-tool .ar-res{display:flex;flex-direction:column;align-items:stretch;box-sizing:border-box}
.extra-tool .ar-res-h{min-height:36px;margin-bottom:4px}
.extra-tool .ar-ico-row button{width:36px;height:36px;min-width:36px}
.extra-tool .ar-res .big{margin:4px 0 0;font-size:clamp(1.75rem,2.6vw,2.2rem)}
.extra-tool .ar-res>.ar-units{margin:12px 0 0}
@media (min-width:700px){
  .extra-tool.is-stack .ar-res{display:grid;grid-template-columns:auto minmax(0,1fr) auto;grid-template-areas:"head head head" "big lines units";align-items:center;column-gap:28px;row-gap:2px}
  .extra-tool.is-stack .ar-res-h{grid-area:head;margin:0 0 2px}
  .extra-tool.is-stack .ar-res .big{grid-area:big;margin:0}
  .extra-tool.is-stack .ex-lines{grid-area:lines;margin:0;align-self:center}
  .extra-tool.is-stack .ar-res>.ar-units{grid-area:units;margin:0;justify-self:end}
}
.extra-tool .math{grid-column:1/-1;margin:0}
.extra-tool .math[open]{padding-bottom:14px}
.extra-tool .math li{color:var(--text);font-variant-numeric:tabular-nums}
.ar-ico-row button.is-done{color:var(--ok)}
.extra-tool .ar-fields[data-n="2"]{grid-template-columns:minmax(0,1fr)}
@media (min-width:640px){
  .extra-tool .ar-fields[data-n="3"]{grid-template-columns:repeat(3,minmax(0,1fr))}
}
@media (max-width:639px){
  .extra-tool .ar-fields[data-n]{grid-template-columns:1fr}
  .extra-tool .ar-fields[data-n]>.ar-field{grid-column:auto}
}
.extra-tool[data-extra-tool="ppi"] .ar-fields{grid-template-columns:minmax(0,1fr)}
.img-drop{position:relative;display:grid;place-items:center;min-height:168px;margin:0;padding:18px 16px;border:1.5px dashed var(--accent);border-radius:16px;background:var(--peach);text-align:center;cursor:pointer}
.img-drop.is-over{background:var(--peach2);border-style:solid}
.img-file{position:absolute;inset:0;z-index:1;width:100%;height:100%;margin:0;opacity:0;cursor:pointer;font-size:0}
.img-drop-empty,.img-drop-got{display:grid;justify-items:center;gap:6px;max-width:100%}
.img-drop-got{gap:10px}
.img-drop-t{font-weight:750;line-height:1.3}
.img-drop-s{color:var(--muted);font-size:.92rem;line-height:1.4}
.img-drop .btn{margin-top:6px;pointer-events:none;background:var(--accent);border-color:var(--accent);color:var(--on-accent)}
@media (hover:hover){.img-drop:hover .btn{background:var(--accent-press);border-color:var(--accent-press);color:var(--on-accent)}}
.img-prev{display:block;max-width:100%;max-height:140px;width:auto;height:auto;border-radius:10px;object-fit:contain;background:var(--surface)}
.img-or{display:flex;align-items:center;gap:12px;margin:14px 0;color:var(--faint);font-size:.78rem;font-weight:700;letter-spacing:.06em;text-transform:uppercase}
.img-or::before,.img-or::after{content:"";flex:1;height:1px;background:var(--line)}
.img-url .ar-ctl{gap:0}
.img-join{border:1px solid var(--line2);border-radius:12px;background:var(--surface);overflow:hidden}
.img-url-in{position:relative;flex:1;min-width:0;display:flex;align-items:stretch}
.ar-field.img-url input[type=text],.ar-field.img-url input[type=text]:focus,.ar-field.img-url input[type=text]:focus-visible{width:100%;border:0;border-radius:0;outline:none;box-shadow:none;background:transparent;min-height:48px;padding:0 44px 0 12px}
.img-url .ar-x{right:40px}
.img-url:has(.ar-x:not([hidden])) input[type=text],.img-url:has(.ar-x:not([hidden])) input[type=text]:focus,.img-url:has(.ar-x:not([hidden])) input[type=text]:focus-visible{padding-right:76px}
.img-paste{position:absolute;top:50%;right:8px;transform:translateY(-50%);width:28px;height:28px;min-width:28px;min-height:28px;border:0;border-radius:999px;background:transparent;color:var(--muted);display:grid;place-items:center;cursor:pointer;padding:0}
.img-paste .ico{width:16px;height:16px}
@media (hover:hover){.img-paste:hover{background:var(--tint);color:var(--text)}}
.img-url .img-go{margin:0;border:0;border-radius:0;border-left:1px solid var(--line2);min-height:48px;padding:0 16px;flex:none;background:var(--surface);color:var(--text)}
@media (hover:hover){.img-url .img-go:hover{background:var(--tint);color:var(--text)}}
.img-facts{display:grid;grid-template-columns:auto minmax(0,1fr);gap:8px 16px;margin:14px 0 0}
.img-facts:empty{display:none}
.img-facts dt{margin:0;color:var(--faint);font-size:.78rem;font-weight:700;letter-spacing:.04em;text-transform:uppercase}
.img-facts dd{margin:0;font-weight:650;font-variant-numeric:tabular-nums;overflow-wrap:anywhere}
.ar-out-col{display:flex;flex-direction:column;gap:12px;min-width:0}
.ar-ico-row{display:flex;gap:8px;justify-content:flex-end;margin:0}
.ar-ico-row button{width:44px;height:44px;min-width:44px;border:1px solid var(--line);border-radius:12px;background:var(--surface);color:var(--text);display:grid;place-items:center;cursor:pointer;padding:0}
.ar-res{background:var(--peach);border:1px solid var(--peach-ln);border-radius:var(--r2);padding:18px;position:relative}
.ar-res .big,.ar-card .big{font-size:clamp(1.35rem,2.2vw,1.85rem);font-weight:800;letter-spacing:-.04em;font-variant-numeric:tabular-nums;line-height:1.05;margin:.2em 0 0;white-space:nowrap}
.shape-vis{min-width:0;height:100%}
.shape-stage{--ink:#475569;--chip:#f4f7fb;position:relative;container-type:size;box-sizing:border-box;width:100%;height:100%;aspect-ratio:1;max-height:none;margin-inline:0;display:grid;place-items:center;overflow:hidden;padding:12px;border:1px solid var(--line);border-radius:16px;background-color:var(--chip);background-image:repeating-linear-gradient(-45deg,transparent,transparent 7px,rgba(148,163,184,.35) 7px,rgba(148,163,184,.35) 8px)}
.shape-tag{position:absolute;top:8px;right:8px;z-index:2;display:inline-flex;align-items:center;gap:6px;margin:0;padding:4px 10px 4px 8px;border:1px solid #e2e8f0;border-radius:999px;background:#fff;color:#64748b;font-size:.72rem;font-weight:650;letter-spacing:.01em;line-height:1.2;pointer-events:none}
.shape-tag .ico{width:14px;height:14px}
.shape-plot{--gx:34px;--gy:30px;--gap:7px;display:grid;grid-template-columns:minmax(0,1fr) var(--gx);grid-template-rows:minmax(0,1fr) var(--gy);column-gap:var(--gap);row-gap:var(--gap);box-sizing:border-box;width:calc(min(100cqw - var(--gx) - var(--gap),(100cqh - var(--gy) - var(--gap)) * var(--rw,16) / var(--rh,9)) + var(--gx) + var(--gap));height:calc(min(100cqh - var(--gy) - var(--gap),(100cqw - var(--gx) - var(--gap)) * var(--rh,9) / var(--rw,16)) + var(--gy) + var(--gap));max-width:100%;max-height:100%;transition:width .2s ease,height .2s ease}
.shape-plot .shape-box{grid-area:1 / 1;display:grid;place-items:center;box-sizing:border-box;width:100%;height:100%;max-width:none;max-height:none;aspect-ratio:auto;background:rgba(37,99,235,.2);color:var(--accent);border:2px solid var(--accent);border-radius:6px;box-shadow:none;container:shapebox / size}
.shape-plot .shape-box span{display:block;max-width:92%;padding:0 8px;font-weight:750;font-size:clamp(.7rem,16cqmin,1.05rem);letter-spacing:-.02em;line-height:1.15;text-align:center;font-variant-numeric:tabular-nums}
@container shapebox (max-height:40px){.shape-plot .shape-box span{visibility:hidden}}
@container shapebox (max-width:56px){.shape-plot .shape-box span{visibility:hidden}}
.dim{position:relative;color:var(--ink);min-width:0;min-height:0}
.dim-w{grid-area:2 / 1}
.dim-h{grid-area:1 / 2}
.dim-line{position:absolute;background:currentColor}
.dim-w .dim-line{left:0;right:0;top:7px;height:1px}
.dim-w .dim-line::before,.dim-w .dim-line::after{content:"";position:absolute;top:-5px;width:1px;height:11px;background:currentColor}
.dim-w .dim-line::before{left:0}
.dim-w .dim-line::after{right:0}
.dim-w::before,.dim-w::after{content:"";position:absolute;top:-7px;width:1px;height:14px;background:currentColor}
.dim-w::before{left:0}
.dim-w::after{right:0}
.dim-h .dim-line{top:0;bottom:0;left:7px;width:1px}
.dim-h .dim-line::before,.dim-h .dim-line::after{content:"";position:absolute;left:-5px;height:1px;width:11px;background:currentColor}
.dim-h .dim-line::before{top:0}
.dim-h .dim-line::after{bottom:0}
.dim-h::before,.dim-h::after{content:"";position:absolute;left:-7px;height:1px;width:14px;background:currentColor}
.dim-h::before{top:0}
.dim-h::after{bottom:0}
.dim-n{position:absolute;background:var(--chip);font-size:12px;font-weight:650;font-variant-numeric:tabular-nums;line-height:1;letter-spacing:-.02em;white-space:nowrap;padding:1px 3px}
.dim-w .dim-n{left:50%;top:12px;transform:translateX(-50%)}
.dim-h .dim-n{left:14px;top:50%;writing-mode:vertical-rl;transform:translateY(-50%)}
.dim-n.is-clip,.dim-line.is-clip{visibility:hidden}
.dim-line.is-clip{visibility:hidden}
.dim-w:has(.dim-line.is-clip)::before,.dim-w:has(.dim-line.is-clip)::after,.dim-h:has(.dim-line.is-clip)::before,.dim-h:has(.dim-line.is-clip)::after{visibility:hidden}
@media (prefers-reduced-motion:reduce){.shape-plot{transition:none}}
@media (max-width:899px){
  .ar-tool[data-layout="linked"] .shape-vis{height:auto}
  .shape-stage{max-width:none;width:100%;height:auto;aspect-ratio:1;margin:0}
}
[data-theme=dark] .shape-stage{--ink:#cbd5e1;--chip:#0f172a;border-color:rgba(148,163,184,.28);background-image:repeating-linear-gradient(-45deg,transparent,transparent 7px,rgba(148,163,184,.28) 7px,rgba(148,163,184,.28) 8px)}
[data-theme=dark] .shape-tag{background:#1e293b;color:#cbd5e1;border-color:rgba(148,163,184,.32)}
[data-theme=dark] .shape-plot .shape-box{background:rgba(37,99,235,.2);color:#93c5fd;border-color:#3b82f6}
@media (prefers-color-scheme:dark){:root:not([data-theme=light]) .shape-stage{--ink:#cbd5e1;--chip:#0f172a;border-color:rgba(148,163,184,.28);background-image:repeating-linear-gradient(-45deg,transparent,transparent 7px,rgba(148,163,184,.28) 7px,rgba(148,163,184,.28) 8px)}:root:not([data-theme=light]) .shape-tag{background:#1e293b;color:#cbd5e1;border-color:rgba(148,163,184,.32)}:root:not([data-theme=light]) .shape-plot .shape-box{background:rgba(37,99,235,.2);color:#93c5fd;border-color:#3b82f6}}

.ar-pair{display:grid;gap:12px}
@media (min-width:700px){.ar-pair{grid-template-columns:1fr 1fr}}
@media (min-width:900px){
  .ar-tool[data-layout="convert"] .ar-grid{align-items:stretch}
  .ar-tool[data-layout="convert"] .ar-out-col{height:100%}
  .ar-tool[data-layout="convert"] .ar-pair{flex:1;gap:20px;grid-template-rows:1fr}
  .ar-tool[data-layout="convert"] .ar-card{display:flex;flex-direction:column}
  .ar-tool[data-layout="convert"] .ar-card .big{margin-block:auto}
  .ar-tool[data-layout="convert"] .ar-card .ar-note{margin-top:0}
}
.ar-card{border:1px solid var(--line);border-radius:var(--r2);padding:14px;background:var(--surface);min-width:0;height:100%;box-sizing:border-box}
.ar-card h3{margin:0 0 8px;font-size:.9rem}
.ar-card .res-label{display:flex;align-items:center;gap:8px}
.ar-mark{display:grid;place-items:center;width:22px;height:22px;border-radius:7px;flex:none}
.ar-mark .ico{width:14px;height:14px}
.ar-card.is-drop{background:var(--danger-bg);border-color:var(--danger-ln)}
.ar-card.is-drop .res-label,.ar-card.is-drop .ar-note{color:var(--danger)}
.ar-card.is-drop .ar-mark{background:color-mix(in srgb,var(--danger) 14%,var(--surface));color:var(--danger)}
.ar-card.is-add{background:color-mix(in srgb,var(--ok) 9%,var(--surface));border-color:color-mix(in srgb,var(--ok) 34%,var(--line))}
.ar-card.is-add .res-label,.ar-card.is-add .ar-note{color:var(--ok)}
.ar-card.is-add .ar-mark{background:color-mix(in srgb,var(--ok) 16%,var(--surface));color:var(--ok)}
.ar-card .big{color:var(--text)}

.open-calc{display:inline-grid;place-items:center;width:44px;height:44px;color:var(--accent)}
[data-theme=dark] .ar-res{background:rgba(37,99,235,.12)}