/* ConcreteCalculator.org - airy off-white, cool grays, burnt-orange accent, peach 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:#f9fafb;--surface:#fff;--text:#111827;--muted:#4b5563;--faint:#6b7280;
--line:#e5e7eb;--line2:#d1d5db;--tint:#f3f4f6;--sink:#eceef1;
--primary:#374151;--link:#b45309;--accent:#b45309;--accent-hi:#d97706;--accent-press:#92400e;--accent-ink:#b45309;--on-accent:#fff;--ring:rgba(180,83,9,.18);
--peach:#fff4e8;--peach2:#ffe8d0;--peach-ln:#f8d5ae;
--ok:#15803d;--danger:#b91c1c;--danger-bg:#fef2f2;--danger-ln:#fecaca;
--ink:#111827;--ink2:#1f2937;--on-ink:#f9fafb;--on-ink-m:#9ca3af;--on-ink-ln:rgba(255,255,255,.1);
--panel-bg:#fff;--panel-ink:#111827;--panel-m:#6b7280;--panel-ln:#e5e7eb;--panel-card:#f9fafb;--panel-accent:#b45309;
--advice-bg:#fff4e8;--advice-ln:#f8d5ae;--advice-ink:#7c2d12;
--chip-on-bg:#b45309;--chip-on-fg:#fff;--grid-ln:rgba(17,24,39,.05);
--dg1:#e5e7eb;--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:#fbb13c;--accent:#fbb13c;--accent-hi:#ffc766;--accent-press:#ffc766;--accent-ink:#fbb13c;--on-accent:#10161d;--ring:rgba(251,177,60,.32);
--peach:rgba(251,177,60,.09);--peach2:rgba(251,177,60,.16);--peach-ln:rgba(251,177,60,.28);
--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:#fbb73a;
--advice-bg:rgba(251,177,60,.1);--advice-ln:rgba(251,177,60,.3);--advice-ink:#fdebc6;
--chip-on-bg:#fbb13c;--chip-on-fg:#10161d;--grid-ln:rgba(255,255,255,.04);
--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:#fbb13c;--accent:#fbb13c;--accent-hi:#ffc766;--accent-press:#ffc766;--accent-ink:#fbb13c;--on-accent:#10161d;--ring:rgba(251,177,60,.32);
--peach:rgba(251,177,60,.09);--peach2:rgba(251,177,60,.16);--peach-ln:rgba(251,177,60,.28);
--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:#fbb73a;
--advice-bg:rgba(251,177,60,.1);--advice-ln:rgba(251,177,60,.3);--advice-ink:#fdebc6;
--chip-on-bg:#fbb13c;--chip-on-fg:#10161d;--grid-ln:rgba(255,255,255,.04);
--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{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}
img,svg{max-width:100%}
img{height:auto}
a{color:var(--link);text-underline-offset:3px;text-decoration-thickness:1px;overflow-wrap:anywhere}
a:hover{text-decoration-thickness:2px}
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);outline-offset:2px;border-radius:8px}
.wrap{max-width:1160px;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:500;font-size:1.04rem;letter-spacing:-.015em;white-space:nowrap}
.logo b{font-weight:780}
.logo img{width:32px;height:32px;border-radius:9px}
.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:1px solid var(--line);border-radius:12px;background:var(--surface);color:var(--text);cursor:pointer;padding:0;font:600 .85rem/1 var(--font);transition:background .15s,border-color .15s,transform .1s}
.ib:active{transform:scale(.95)}
.ib .ico{width:20px;height:20px}
.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}
.badge{position:absolute;top:-5px;right:-5px;min-width:19px;height:19px;padding:0 5px;border-radius:10px;background:var(--accent);color:var(--on-accent);font-size:.7rem;font-weight:800;display:grid;place-items:center;border:2px solid var(--bg)}
@media (hover:hover){.ib:hover,.find:hover{background:var(--tint);border-color:var(--line2)}}

@media (max-width:420px){.logo{font-size:.95rem;gap:8px}.logo img{width:30px;height:30px}.head-act{gap:6px}.ib,.find{width:40px;height:40px}.head-in{gap:8px}}
@media (max-width:350px){.logo span{display:none}}
/* desktop nav + mega menu */
@media (min-width:960px){
.nav{display:flex;align-items:stretch;gap:2px;margin-left:12px;height:100%}
.nav-dd{display:flex;align-items:center}
.nav-l{display:inline-flex;align-items:center;height:40px;padding:0 12px;border-radius:10px;color:var(--text);text-decoration:none;font-weight:550;font-size:.95rem;align-self:center}
.nav>.nav-l{align-self:center}
.nav-l[aria-current=page]{background:var(--peach);color:var(--accent);font-weight:650}
@media (hover:hover){.nav-l:hover{background:var(--peach);color:var(--accent)}}
.nav-chev{display:inline-grid;place-items:center;width:26px;height:40px;margin-left:-8px;border:0;background:transparent;color:var(--muted);cursor:pointer;padding:0;align-self:center;border-radius:0 10px 10px 0}
.nav-chev .ico{width:16px;height:16px;transition:transform .2s}
.nav-dd:hover .nav-chev .ico,.nav-dd.open .nav-chev .ico{transform:rotate(180deg)}
.mega{position:absolute;left:50%;top:100%;width:min(980px,calc(100vw - 32px));background:var(--surface);border:1px solid var(--line);border-radius:0 0 var(--r) var(--r);box-shadow:var(--shadow-lg);opacity:0;visibility:hidden;transform:translate(-50%,-6px);transition:opacity .16s,transform .16s,visibility 0s .16s;pointer-events:none}
.nav-dd:hover .mega,.nav-dd:focus-within .mega,.nav-dd.open .mega{opacity:1;visibility:visible;transform:translate(-50%,0);transition-delay:0s;pointer-events:auto}
.mega-in{display:grid;grid-template-columns:1.9fr 1fr 1fr 1fr;gap:26px;padding:24px 26px 14px}
.mega-col h3{font-size:.7rem;letter-spacing:.1em;text-transform:uppercase;color:var(--faint);font-weight:650;margin:0 0 8px}
.mega-col ul{list-style:none;padding:0;margin:0}
.mega-shapes ul{columns:2;column-gap:10px}
.mega-col li{margin:0;break-inside:avoid}
.mega a{display:flex;align-items:center;gap:10px;padding:8px 10px;border-radius:10px;color:var(--text);text-decoration:none;font-weight:550;font-size:.93rem}
.mega a .ico{width:19px;height:19px;color:var(--faint);transition:color .15s}
.mega a:hover,.mega a:focus-visible{background:var(--peach)}
.mega a:hover .ico{color:var(--accent)}
.mega-foot{display:flex;gap:6px;align-items:center;padding:10px 20px 14px;border-top:1px solid var(--line);background:var(--tint);border-radius:0 0 var(--r) var(--r)}
.mega-foot a{padding:8px 12px;font-weight:600;font-size:.9rem;color:var(--link)}
.mega-foot a .ico{width:16px;height:16px}
.mega-find{margin-left:auto;display:inline-flex;align-items:center;gap:8px;border:1px solid var(--line2);background:var(--surface);color:var(--text);padding:8px 12px;border-radius:10px;font:600 .88rem/1 var(--font);cursor:pointer}
.mega-find .ico{width:16px;height:16px}
.find{width:auto;min-width:200px;justify-content:flex-start;display:inline-flex;align-items:center;gap:10px;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:250px}}

/* 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{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-top a .ico{color:var(--faint);width:18px;height:18px}
.mn-top a[aria-current=page]{border-color:var(--accent);box-shadow:inset 3px 0 0 var(--accent)}
.mn-group{margin-bottom:18px}
.mn-group h3{font-size:.7rem;letter-spacing:.1em;text-transform:uppercase;color:var(--faint);margin:0 0 8px 4px;font-weight:650}
.mn-group ul{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:8px}
.mn-group li{margin:0}
.mn-group a{display:flex;align-items:center;gap:10px;min-height:50px;padding:8px 12px;border-radius:12px;background:var(--surface);border:1px solid var(--line);color:var(--text);text-decoration:none;font-weight:600;font-size:.92rem;line-height:1.2}
.mn-group a .ico{color:var(--accent)}
.mn-foot{display:flex;flex-wrap:wrap;gap:8px;padding-top:6px}
.mn-foot .btn{flex:1 1 auto}

/* ---------- page frame ---------- */
.page{padding:16px 0 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(--accent);text-decoration:none;font-weight:550}
.crumbs a:hover{color:var(--accent-press);text-decoration:underline}
.crumbs [aria-current]{color:var(--text);font-weight:550}
.page-head{padding:2px 0 18px}
.page-head h1{margin-bottom:.4em}
.lede{font-size:1.1rem;line-height:1.6;color:var(--muted);max-width:64ch}
.badges{display:flex;flex-wrap:wrap;gap:4px 16px;list-style:none;padding:0;margin:14px 0 0;font-size:.82rem;font-weight:550;color:var(--muted)}
.badges li{margin:0;display:flex;align-items:center;gap:6px}
.badges li::before{content:"";width:14px;height:14px;border-radius:50%;background:var(--ok) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='3.4' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M6 12.5l4 4 8-9'/%3E%3C/svg%3E") center/10px no-repeat}
.meta-row{display:flex;align-items:center;justify-content:space-between;gap:10px 16px;flex-wrap:wrap;margin:0 0 14px}
.page-head .meta-row{margin:14px 0 0}
.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}.badges{display:none}.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{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:44px;align-items:start}}
.content{min-width:0}
.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)}}
.side-pl{background:var(--peach);border-color:var(--peach-ln);color:var(--text)}
.side-pl h2{color:var(--accent)}
.side-pl p{color:var(--muted);font-size:.9rem;margin:0 6px 12px}
.side-pl .btn{margin-left:6px}
.side-sticky{position:sticky;top:84px}
.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)}
.sec ol li::marker{color:var(--muted);font-weight:650}
.band{padding:56px 0}
.band.alt{background:var(--surface);border-block:1px solid var(--line)}
.band.tint{background:var(--tint)}
.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)}

/* ---------- 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;transition:transform .12s,background .15s,border-color .15s,box-shadow .15s;-webkit-tap-highlight-color:transparent}
.btn .ico{width:18px;height:18px}
.btn.pri{background:var(--accent);border-color:var(--accent);color:var(--on-accent);box-shadow:0 1px 2px rgba(0,0,0,.14),0 8px 16px -8px var(--accent)}
.btn.lg{min-height:50px;padding:0 24px;font-size:1rem;border-radius:12px}
.btn.sm{min-height:36px;padding:0 12px;font-size:.84rem;border-radius:9px}
.btn.ghost{background:transparent;border-color:transparent;color:var(--muted)}
.btn.sm.ghost{border-color:var(--line)}
.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)}.btn.pri:hover{background:var(--accent-press);border-color:var(--accent-press)}.btn.ghost:hover{color:var(--text)}}
.chip{display:inline-flex;align-items:center;justify-content:center;flex:none;min-width:48px;height:40px;padding:0 16px;border:1px solid var(--line2);border-radius:999px;background:var(--surface);color:var(--text);font:600 .9rem/1 var(--font);cursor:pointer;transition:background .15s,border-color .15s,color .15s;-webkit-tap-highlight-color:transparent}
.chip.on{background:var(--chip-on-bg);border-color:var(--chip-on-bg);color:var(--chip-on-fg)}
@media (hover:hover){.chip:not(.on):hover{background:var(--peach);border-color:var(--accent);color:var(--accent)}}
.chip-link{display:inline-flex;align-items:center;gap:7px;height:36px;padding:0 13px 0 11px;border:1px solid var(--line2);border-radius:999px;background:var(--surface);color:var(--text);font:600 .86rem/1 var(--font);text-decoration:none;cursor:pointer;white-space:nowrap;transition:background .15s,border-color .15s}
.chip-link .ico{width:16px;height:16px;color:var(--accent)}
@media (hover:hover){.chip-link:hover{border-color:var(--accent);background:var(--peach);color:var(--accent)}}
.try,.jump{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin-top:16px}
.try-l{font-size:.78rem;font-weight:650;color:var(--faint);text-transform:uppercase;letter-spacing:.08em;margin-right:4px}
.jump{margin:16px 0 0}
.hub-find{display:flex;align-items:center;gap:12px;width:100%;max-width:520px;height:54px;margin-top:18px;padding:0 20px;border:1.5px solid var(--line2);border-radius:999px;background:var(--surface);color:var(--muted);font:500 1rem/1 var(--font);cursor:pointer;text-align:left;box-shadow:var(--shadow)}
.hub-find span{flex:1}
.hub-find .ico{color:var(--accent)}
@media (hover:hover){.hub-find:hover{border-color:var(--accent)}}

/* ---------- forms ---------- */
input[type=text],input[type=search],select{font:inherit;color:var(--text)}
.field{min-width:0}
.field[hidden]{display:none}
label{display:block;font-weight:600;font-size:.85rem;margin-bottom:7px;color:var(--text)}
.opt{font-weight:450;color:var(--faint);font-size:.76rem;margin-left:4px}
.hint{font-size:.8rem;color:var(--muted);margin:7px 0 0;line-height:1.5}
.err{font-size:.82rem;color:var(--danger);margin:6px 0 0;font-weight:550}
.inp{position:relative;display:flex;align-items:stretch;border:1.5px solid var(--line2);border-radius:14px;background:var(--surface);transition:border-color .15s,box-shadow .15s}
.inp:focus-within{border-color:var(--accent);box-shadow:0 0 0 4px var(--ring)}
.inp input{flex:1;min-width:0;border:0;outline:0;background:transparent;min-height:48px;padding:0 12px;font-size:1.0625rem;font-weight:600;letter-spacing:-.01em;font-variant-numeric:tabular-nums;border-radius:14px 0 0 14px;color:var(--text)}
.inp input::placeholder{color:var(--faint);font-weight:500}
.inp select{order:3;flex:0 0 auto;width:auto;min-width:68px;max-width:98px;border:0;border-left:1px solid var(--line);outline:0;border-radius:0 12px 12px 0;background:var(--tint) 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") right 8px center/14px no-repeat;-webkit-appearance:none;appearance:none;padding:0 28px 0 12px;font-size:.95rem;font-weight:600;color:var(--muted);cursor:pointer}
.inp .clr{order:2;display:none;align-self:center;flex:none;width:26px;height:26px;margin-right:6px;border:0;border-radius:50%;background:var(--tint);color:var(--muted);font-size:17px;line-height:1;cursor:pointer;padding:0;place-items:center}
.inp.has .clr{display:grid}
.inp-s{display:inline-flex;align-items:center;width:104px;flex:none}
.inp-s input{min-height:40px;padding:0 4px 0 12px;font-size:.95rem}
.sfx{padding-right:12px;color:var(--muted);pointer-events:none;font-weight:600}
select:not(.inp select){width:100%;min-height:48px;padding:0 12px;border:1.5px solid var(--line2);border-radius:12px;background:var(--surface);font-size:1rem;font-weight:600}
input[type=text]:not(.inp input):not(.pl-label):not(.pl-waste){width:100%;min-height:48px;padding:0 12px;border:1.5px solid var(--line2);border-radius:12px;background:var(--surface);font-size:1rem}
input:not(.inp input):focus,select:not(.inp select):focus{outline:0;border-color:var(--accent);box-shadow:0 0 0 4px var(--ring)}
.field.bad .inp,.field[aria-invalid=true] .inp{border-color:var(--danger)}
.field.bad .inp:focus-within{box-shadow:0 0 0 4px rgba(179,38,30,.18)}

/* ---------- unit switcher strip ---------- */
.switcher{position:relative;margin:0 calc(var(--pad)*-1) 14px}
.sw-track{display:flex;align-items:center;gap:8px;overflow-x:auto;scroll-snap-type:x proximity;padding:4px var(--pad) 8px;scrollbar-width:none;-webkit-overflow-scrolling:touch;-webkit-mask-image:linear-gradient(90deg,transparent 0,#000 18px,#000 calc(100% - 34px),transparent 100%);mask-image:linear-gradient(90deg,transparent 0,#000 18px,#000 calc(100% - 34px),transparent 100%)}
.sw-track::-webkit-scrollbar{display:none}
.sw-label{flex:none;font-size:.66rem;font-weight:700;letter-spacing:.11em;text-transform:uppercase;color:var(--faint);padding:0 2px 0 10px;border-left:1px solid var(--line2);margin-left:4px;line-height:1}
.sw-label:first-child{border-left:0;margin-left:0;padding-left:0}
.sw-chip{flex:none;display:inline-flex;align-items:center;gap:7px;height:40px;padding:0 15px 0 12px;border:1px solid var(--line2);border-radius:999px;background:var(--surface);color:var(--text);font:600 .9rem/1 var(--font);text-decoration:none;white-space:nowrap;scroll-snap-align:center;cursor:pointer;transition:background .15s,border-color .15s,transform .1s;-webkit-tap-highlight-color:transparent}
.sw-chip .ico{width:17px;height:17px;color:var(--accent)}
.sw-chip:active{transform:scale(.97)}
.sw-chip[aria-current=page]{background:var(--chip-on-bg);border-color:var(--chip-on-bg);color:var(--chip-on-fg)}
.sw-chip[aria-current=page] .ico{color:currentColor}
[data-theme=dark] .sw-chip[aria-current=page] .ico{color:#10161d}
@media (prefers-color-scheme:dark){:root:not([data-theme=light]) .sw-chip[aria-current=page] .ico{color:#10161d}}
.sw-more{border-style:dashed;color:var(--muted)}
@media (hover:hover){.sw-chip:not([aria-current]):hover{background:var(--peach);border-color:var(--accent);color:var(--accent)}}
.sw-arrow{position:absolute;top:2px;width:40px;height:40px;display:none;place-items:center;border:1px solid var(--line2);border-radius:50%;background:var(--surface);color:var(--text);cursor:pointer;box-shadow:var(--shadow);z-index:2;padding:0}
.sw-arrow.l{left:6px}.sw-arrow.r{right:6px}
.sw-arrow .ico{width:18px;height:18px}
.sw-arrow.l .ico{transform:rotate(180deg)}
@media (hover:hover) and (min-width:960px){.switcher{margin-inline:0}.sw-track{padding-inline:2px}.sw-arrow.on{display:grid}}

/* ---------- calculator ---------- */
.calc{margin:0 0 26px}
.calc-grid{display:grid;grid-template-columns:minmax(0,1fr);gap:16px}
.calc-in{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:20px 18px 22px;box-shadow:var(--shadow)}
.calc-out{min-width:0}
@media (min-width:980px){
.calc-grid{grid-template-columns:minmax(0,1fr) minmax(0,.92fr);gap:22px;align-items:start}
.calc-in{padding:26px}
.calc-out{position:sticky;top:84px}
}
.calc-bar{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:16px}
.calc-bar h2{margin:0;font-size:1.05rem;letter-spacing:-.012em}
.seg{display:inline-flex;padding:3px;background:var(--tint);border:1px solid var(--line);border-radius:999px;gap:2px}
.seg button{border:0;background:transparent;min-height:34px;padding:0 16px;border-radius:999px;font:650 .84rem/1 var(--font);color:var(--muted);cursor:pointer;transition:background .15s,color .15s}
.seg button[aria-pressed=true]{background:var(--accent);color:var(--on-accent);box-shadow:0 2px 6px -2px var(--accent)}
.presets{margin:0 0 18px}
.presets-l{display:block;font-size:.72rem;font-weight:650;letter-spacing:.09em;text-transform:uppercase;color:var(--faint);margin-bottom:8px}
.presets-row{display:flex;gap:8px;overflow-x:auto;scrollbar-width:none;margin:0 -18px;padding:2px 18px 4px;scroll-snap-type:x proximity}
.presets-row::-webkit-scrollbar{display:none}
.presets .chip{scroll-snap-align:start}
@media (min-width:980px){.presets-row{flex-wrap:wrap;margin:0;padding:0;overflow:visible}}
.fgrid2{display:grid;grid-template-columns:minmax(0,1fr);gap:16px}
@media (min-width:520px){.fgrid2{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}}
.waste{margin-top:18px}
.chips{display:flex;flex-wrap:wrap;gap:8px;align-items:center}
.adv{margin-top:18px;border:1px solid var(--line);border-radius:12px;background:var(--bg);padding:0 14px}
.adv summary{cursor:pointer;font-weight:600;font-size:.9rem;padding:13px 0;list-style:none;display:flex;justify-content:space-between;align-items:center;color:var(--muted)}
.adv summary::-webkit-details-marker{display:none}
.adv 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}
.adv[open] summary::after{transform:rotate(180deg)}
.adv[open]{padding-bottom:14px}
.adv-g{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:12px;margin-top:2px}
.acts{display:flex;gap:10px;margin-top:22px;flex-wrap:wrap}
.acts .btn.pri{flex:1 1 180px}
.errs{background:var(--danger-bg);color:var(--danger);border:1px solid var(--danger-ln);border-radius:var(--r2);padding:12px 16px;margin:16px 0 0;font-size:.92rem}
.errs p{margin:0 0 4px}.errs ul{margin:0}
/* result panel */
.result,.pl-total{position:relative;overflow:hidden;background:var(--panel-bg);color:var(--panel-ink);border:1px solid var(--panel-ln);border-radius:var(--r);padding:24px 20px 20px;box-shadow:var(--shadow-lg)}
.result::before,.pl-total::before{content:"";position:absolute;left:0;right:0;top:0;height:3px;background:linear-gradient(90deg,var(--accent),var(--accent-hi) 55%,transparent)}
.res-main{display:flex;flex-direction:column;gap:2px;margin-bottom:14px}
.res-label{font-size:.74rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--panel-accent)}
.res-num{display:block;font-size:clamp(2.3rem,9vw,3.3rem);line-height:1.04;letter-spacing:-.035em;font-weight:780;color:var(--panel-ink);font-variant-numeric:tabular-nums;margin:4px 0}
.res-sub{color:var(--panel-m);font-size:.93rem;line-height:1.45}
.res-advice{background:var(--advice-bg);border:1px solid var(--advice-ln);color:var(--advice-ink);border-radius:12px;padding:11px 14px;margin:0 0 14px;font-size:.92rem;line-height:1.5}
.details{margin-top:18px}
.res-grid{display:grid;grid-template-columns:minmax(0,1fr);gap:12px}
@media (min-width:600px){.res-grid{grid-template-columns:repeat(auto-fit,minmax(250px,1fr))}}
.res-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--r2);padding:16px 18px;box-shadow:var(--shadow)}
.res-card h3{font-size:.72rem;text-transform:uppercase;letter-spacing:.1em;color:var(--faint);margin:0 0 8px;font-weight:700}
.res-card dl{margin:0}
.res-card dl>div{display:flex;justify-content:space-between;gap:14px;padding:8px 0;border-bottom:1px solid var(--line);font-size:.93rem}
.res-card dl>div:last-child{border-bottom:0;padding-bottom:0}
.res-card dt{color:var(--muted)}
.res-card dd{margin:0;font-weight:650;text-align:right;color:var(--text);font-variant-numeric:tabular-nums}
.res-cnote,.res-note{font-size:.8rem;color:var(--muted);margin:10px 0 0;line-height:1.5}
.res-note{margin-top:14px}
.res-eg{font-size:.8rem;color:var(--panel-m);margin:14px 0 0;padding-top:12px;border-top:1px dashed var(--panel-ln)}
.result[data-example="0"] .res-eg{display:none}
.result .res-main{margin-bottom:12px}
.result .res-advice{margin-bottom:0}
.result.flash .res-num{animation:pop .4s cubic-bezier(.2,.8,.2,1)}
@keyframes pop{0%{opacity:.4;transform:translateY(5px)}100%{opacity:1;transform:none}}
.res-acts{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}
.calc-out .res-acts{display:grid;grid-template-columns:repeat(3,1fr)}
.calc-out .res-acts .btn{padding:0 8px;min-height:44px;font-size:.88rem}
.calc-out .res-acts .btn.pri{grid-column:1/-1;min-height:50px;font-size:.98rem}
.history{background:var(--surface);border:1px solid var(--line);border-radius:var(--r2);padding:12px 16px;margin:14px 0 0}
.history h3{font-size:.72rem;letter-spacing:.1em;text-transform:uppercase;color:var(--faint);margin:0 0 4px}
.history ul{list-style:none;padding:0;margin:0}
.history li{display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap;border-top:1px solid var(--line);padding:8px 0;margin:0;font-size:.9rem}
.history li:first-child{border-top:0}
.history li span{color:var(--muted)}
/* next steps */
.kit{margin:0 0 30px}
.kit-head{display:flex;align-items:baseline;justify-content:space-between;gap:4px 16px;flex-wrap:wrap;margin-bottom:12px}
.kit-h{margin:0;font-size:1.12rem}
.kit-head p{margin:0;color:var(--muted);font-size:.88rem}
.kit ul{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:10px}
.kit li{margin:0}
.kit a{display:flex;gap:12px;align-items:center;padding:12px 14px;border:1px solid var(--line);border-radius:var(--r2);background:var(--surface);text-decoration:none;color:var(--text);height:100%;transition:border-color .15s,transform .15s,box-shadow .15s}
.kit a>.ico:first-child{width:42px;height:42px;padding:10px;border-radius:12px;background:var(--peach);color:var(--accent);transition:background .15s,color .15s}
.kit-t{display:flex;flex-direction:column;min-width:0;line-height:1.3}
.kit-t b{font-weight:650}
.kit small{color:var(--muted);font-size:.82rem}
.kit-go{margin-left:auto;color:var(--faint);width:18px!important;height:18px!important;transition:transform .15s,color .15s}
@media (hover:hover){.kit a:hover{border-color:var(--accent);box-shadow:var(--shadow);transform:translateY(-1px)}.kit a:hover>.ico:first-child{background:var(--accent);color:var(--on-accent)}.kit a:hover .kit-go{transform:translateX(3px);color:var(--text)}}
.math,.recent{background:var(--surface);border:1px solid var(--line);border-radius:var(--r2);padding:0 18px;margin:0 0 22px}
.math summary,.recent 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}
.recent ul{list-style:none;padding:0;margin:10px 0 0}
.recent li{display:flex;justify-content:space-between;gap:10px;border-top:1px dashed var(--line);padding:6px 0}
/* mobile result dock */
.dock{position:fixed;left:0;right:0;bottom:0;z-index:45;display:flex;align-items:center;justify-content:space-between;gap:12px;padding:10px max(14px,env(safe-area-inset-right)) calc(10px + env(safe-area-inset-bottom)) max(14px,env(safe-area-inset-left));background:var(--surface);color:var(--text);border-top:1px solid var(--line);box-shadow:0 -8px 28px rgba(17,24,39,.12);transform:translateY(110%);visibility:hidden;transition:transform .26s cubic-bezier(.2,.8,.2,1),visibility 0s .26s}
.dock.show{transform:none;visibility:visible;transition:transform .26s cubic-bezier(.2,.8,.2,1)}
.dock-main{display:flex;flex-direction:column;min-width:0;line-height:1.15}
.dock-l{font-size:.68rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--accent);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.dock-v{font-size:1.35rem;font-weight:780;letter-spacing:-.025em;color:var(--text);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;font-variant-numeric:tabular-nums}
.dock .btn{min-height:44px;flex:none}
@media (min-width:980px){.dock{display:none!important}}

/* ---------- content widgets ---------- */
.fig{margin:1.2em 0 1.6em;text-align:center}
.fig figcaption{font-size:.85rem;color:var(--muted);margin-top:8px}
.dg{max-width:540px;width:100%;height:auto;background:var(--surface);border:1px solid var(--line);border-radius:var(--r2);padding:8px}
.dg .s{stroke:var(--primary);stroke-width:1.5;stroke-linejoin:round}
.dg .f1{fill:var(--dg1)}.dg .f2{fill:var(--dg2)}.dg .f3{fill:var(--dg3)}
.dg .d{stroke:var(--accent);stroke-width:1.6;fill:none}
.dg .bar{stroke:var(--primary);stroke-width:2}
.dg .jt{stroke:var(--accent);stroke-width:2;stroke-dasharray:5 3}
.dg text{font:600 12px var(--font);fill:var(--text)}
.dg .tl{font-weight:500;fill:var(--muted)}
.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}
.disc{font-size:.82rem;color:var(--muted);border-top:1px solid var(--line);padding-top:16px;max-width:none!important}
.note-box{border:1px solid var(--line);border-left:4px solid var(--accent);border-radius:var(--r2);background:var(--surface);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);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-d{grid-area:d;font-size:.86rem;color:var(--muted);line-height:1.4}
.card-go{grid-area:g;width:18px;height:18px;color:var(--faint);transition:transform .18s,color .18s}
@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)}}
.related h2{font-size:1.2rem}
.pill{display:inline-block;padding:3px 10px;border-radius:999px;background:var(--accent);color:var(--on-accent);font-size:.72rem;font-weight:700;letter-spacing:.04em;text-transform:uppercase}
.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:radial-gradient(820px 340px at 88% -12%,var(--peach2),transparent 66%),radial-gradient(520px 260px at 4% 0%,var(--peach),transparent 70%),var(--bg);color:var(--text);padding:26px 0 28px;border-bottom:1px solid var(--line)}
.hero::before{content:"";position:absolute;inset:0;background-image:linear-gradient(var(--grid-ln) 1px,transparent 1px),linear-gradient(90deg,var(--grid-ln) 1px,transparent 1px);background-size:36px 36px;-webkit-mask-image:linear-gradient(180deg,#000 0%,transparent 80%);mask-image:linear-gradient(180deg,#000 0%,transparent 80%)}
.hero .wrap{position:relative}
.hero h1{color:var(--text);font-size:clamp(2.2rem,6.4vw,3.6rem);font-weight:800;letter-spacing:-.04em;margin-bottom:.3em}
.hero-p{color:var(--muted);max-width:54ch;font-size:clamp(1rem,2.4vw,1.15rem);line-height:1.6;margin-bottom:0}
.eyebrow{display:inline-flex;align-items:center;gap:8px;margin:0 0 16px;padding:6px 13px;border:1px solid var(--peach-ln);border-radius:999px;background:var(--peach);color:var(--advice-ink);font-size:.78rem;font-weight:650;letter-spacing:.01em}
.eyebrow::before{content:"";width:7px;height:7px;border-radius:50%;background:var(--accent);box-shadow:0 0 0 4px var(--ring)}
.hero-links{display:flex;flex-wrap:nowrap;overflow-x:auto;scrollbar-width:none;gap:8px;align-items:center;margin:24px calc(var(--pad)*-1) 0;padding:2px var(--pad);color:var(--faint);font-size:.84rem}
.hero-links::-webkit-scrollbar{display:none}
.hero-links>span{flex:none;margin-right:4px}
.chip-link.on-dark{flex:none;background:var(--surface);border-color:var(--line2);color:var(--text)}
.chip-link.on-dark .ico{color:var(--accent)}
@media (hover:hover){.chip-link.on-dark:hover{background:var(--peach);border-color:var(--accent);color:var(--accent)}}
@media (min-width:760px){.hero{padding:50px 0 44px}.hero-links{flex-wrap:wrap;overflow:visible;margin-inline:0;padding-inline:0}}
.hero-calc{position:relative;z-index:2;margin-top:28px;padding-bottom:12px}
@media (min-width:760px){.hero-calc{margin-top:36px}}
.hcalc{display:grid;grid-template-columns:minmax(0,1fr);gap:16px}
@media (min-width:1000px){.hcalc{grid-template-columns:minmax(0,1.2fr) minmax(0,1fr);align-items:start;gap:22px}.hres{position:sticky;top:84px}}
.hc-main{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);overflow:hidden;box-shadow:var(--shadow-lg)}
.tabs{display:grid;grid-template-columns:repeat(5,1fr);gap:6px;padding:8px;background:var(--tint);border-bottom:1px solid var(--line)}
.tab{display:flex;flex-direction:column;align-items:center;justify-content:flex-start;gap:6px;padding:10px 2px 9px;border:1px solid transparent;border-radius:12px;background:transparent;color:var(--muted);font:600 .74rem/1.2 var(--font);cursor:pointer;transition:background .15s,color .15s,box-shadow .15s;-webkit-tap-highlight-color:transparent;text-align:center}
.tab img{width:40px;height:40px;object-fit:contain;filter:saturate(.9)}
.tab[aria-selected=true]{background:var(--surface);color:var(--text);box-shadow:0 1px 3px rgba(16,22,29,.14);border-color:var(--line)}
.tab[aria-selected=true] span{box-shadow:0 2px 0 var(--accent)}
@media (min-width:520px){.tab{font-size:.84rem;padding:12px 4px 11px}.tab img{width:48px;height:48px}}
.hpanel{padding:22px 18px 24px}
@media (min-width:520px){.hpanel{padding:26px}}
.hpanel h2{font-size:1.28rem;margin-bottom:.3em}
.hpanel .sub{color:var(--muted);margin:0 0 20px;font-size:.95rem}
.hgrid{display:grid;grid-template-columns:minmax(0,1fr);gap:0}
.hmedia{display:flex;gap:16px;align-items:center;margin:20px 0 0;padding-top:18px;border-top:1px dashed var(--line2)}
.hmedia img{width:88px;max-width:88px;height:auto;border-radius:12px;background:#fff;border:1px solid var(--line);flex:none}
.formula{flex:1;min-width:0}
.formula h4{margin:0 0 3px;font-size:.72rem;letter-spacing:.1em;text-transform:uppercase;color:var(--faint)}
.formula p{margin:0;color:var(--muted);font-size:.86rem;line-height:1.5}
.hform{margin:0}
.hres{background:var(--panel-bg);color:var(--panel-ink);border:1px solid var(--panel-ln);border-radius:var(--r);padding:22px 18px 20px;box-shadow:var(--shadow-lg);position:relative;overflow:hidden;min-width:0}
.hres::before{content:"";position:absolute;left:0;right:0;top:0;height:3px;background:linear-gradient(90deg,var(--accent),var(--accent-hi) 55%,transparent)}
@media (min-width:520px){.hres{padding:26px}}
.hres h2{font-size:1rem;margin:0;color:var(--panel-ink)}
.hres-head{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-bottom:14px}
.eg-pill{padding:3px 10px;border-radius:999px;background:var(--peach);color:var(--accent);font-size:.72rem;font-weight:650;letter-spacing:.04em;text-transform:uppercase}
.hres-hero{display:flex;flex-direction:column;margin-bottom:14px}
.hres-hero .l{font-size:.74rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--panel-accent)}
.hres-hero .big{font-size:clamp(2.3rem,9vw,3.3rem);line-height:1.05;letter-spacing:-.035em;font-weight:780;color:var(--panel-ink);font-variant-numeric:tabular-nums;margin-top:4px}
.mgrid{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-bottom:8px}
.mgrid.two{grid-template-columns:repeat(2,1fr)}
.metric{background:var(--panel-card);border:1px solid var(--panel-ln);border-radius:12px;padding:10px 12px;display:flex;flex-direction:column;min-width:0}
.metric .l{font-size:.68rem;color:var(--panel-m);text-transform:uppercase;letter-spacing:.07em;font-weight:650}
.metric .v{font-weight:720;font-size:1rem;word-break:break-word;color:var(--panel-ink);font-variant-numeric:tabular-nums;margin-top:2px}
@media (max-width:420px){.mgrid{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}.mgrid .metric:nth-child(3){grid-column:1/-1}}
.hres .res-acts{margin-top:14px}
.hres .res-acts .btn{flex:1 1 0}
.hres .res-acts .btn:not(.pri){background:var(--surface);border-color:var(--line2);color:var(--text)}
.hres-note{font-size:.8rem;color:var(--panel-m);margin:12px 0 0;line-height:1.55}
.hres-note a{color:var(--accent)}
.hres .math{background:var(--panel-card);border-color:var(--panel-ln);margin:14px 0 0}
.hres .math summary{color:var(--panel-ink);font-size:.92rem}
.hres .math li{color:var(--muted)}

.gt{font-weight:700;margin:8px 0 6px}
.proc{background:var(--surface);border:1px solid var(--line);border-radius:var(--r2);padding:10px 14px;margin:12px 0;font-size:.88rem;color:var(--muted)}
.hist-list{display:grid;gap:10px}
.twocol{display:grid;gap:32px;grid-template-columns:1fr}
@media (min-width:900px){.twocol{grid-template-columns:minmax(0,1fr) 340px;align-items:start;gap:44px}}
.stat{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:12px;margin:1em 0}
.stat div{background:var(--surface);border:1px solid var(--line);border-radius:var(--r2);padding:14px 16px}
.stat b{display:block;font-size:1.35rem;letter-spacing:-.02em}
.stat span{font-size:.85rem;color:var(--muted)}
.cta{background:var(--peach);border:1px solid var(--peach-ln);color:var(--text);border-radius:var(--r);padding:34px 22px;text-align:center;position:relative;overflow:hidden}
.cta::before{content:"";position:absolute;inset:0;background:radial-gradient(600px 220px at 50% -20%,var(--peach2),transparent 70%)}
.cta>*{position:relative}
.cta h2{color:var(--text)}
.cta p{color:var(--muted);max-width:60ch;margin-left:auto;margin-right:auto}
.cta a:not(.btn){color:var(--accent)}
.cta .btn:not(.pri){background:var(--surface);border-color:var(--line2);color:var(--text)}
.cta .disc{color:var(--muted);border-top-color:var(--peach-ln);margin-top:22px}
@media (min-width:760px){.cta{padding:52px 40px}}

/* ---------- 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(2,1fr);gap:30px 20px}
.fbrand{grid-column:1/-1}
@media (min-width:900px){.fgrid{grid-template-columns:1.5fr repeat(4,1fr);gap:30px}.fbrand{grid-column:auto}}
.fbrand .logo{color:var(--text)}
.fbrand p{font-size:.9rem;line-height:1.6;margin:12px 0}
.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 li{margin:0}
.fcol a{display:inline-block;padding:5px 0;color:var(--text);text-decoration:none;font-size:.92rem}
.fcol a:hover{color:var(--accent);text-decoration:underline}
.fdisc,.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)}

/* ---------- 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}
html.dock-on .fab{bottom:calc(84px + env(safe-area-inset-bottom))}
.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}
.share-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(130px,1fr));gap:10px;padding:18px}
.share-grid a,.share-grid button{display:flex;align-items:center;justify-content:center;gap:8px;padding:0 10px;border:1px solid var(--line2);border-radius:var(--r3);background:var(--surface);color:var(--text);font:600 .9rem/1 var(--font);text-decoration:none;cursor:pointer;min-height:46px}
@media (hover:hover){.share-grid a:hover,.share-grid button:hover{background:var(--tint)}}
.toc-list{list-style:none;margin:0;padding:8px 8px 18px}
.toc-list li{margin:0}
.toc-list a{display:block;padding:12px 14px;border-radius:10px;color:var(--text);text-decoration:none;font-weight:550}
@media (hover:hover){.toc-list a:hover{background:var(--tint)}}
#pl-mini{padding:16px 20px 20px}
.pl-row{display:flex;gap:10px;align-items:center;justify-content:space-between;padding:10px 0;border-bottom:1px solid var(--line)}
.pl-row span{min-width:0;overflow:hidden;text-overflow:ellipsis}
.pl-tot{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:10px;margin:12px 0}
.toast{position:fixed;left:50%;bottom:calc(88px + env(safe-area-inset-bottom));transform:translateX(-50%);background:var(--ink);color:#fff;padding:12px 20px;border-radius:999px;font-weight:600;font-size:.92rem;z-index:80;box-shadow:0 10px 30px rgba(0,0,0,.3);max-width:calc(100vw - 32px);text-align:center;animation:toastin .25s cubic-bezier(.2,.8,.2,1)}
@keyframes toastin{from{opacity:0;transform:translate(-50%,10px)}to{opacity:1;transform:translate(-50%,0)}}
/* 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);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;border:0;background:var(--tint);color:var(--muted);height:34px;padding:0 12px;border-radius:9px;font:600 .82rem/1 var(--font);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);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}}

/* ---------- pour list page, history, glossary ---------- */
.narrow{max-width:860px}
.no-calc{color:var(--muted);margin:0}
.hi{background:var(--surface);border:1px solid var(--line);border-radius:var(--r2);padding:14px 16px;margin:0 0 10px}
.hi header{display:flex;align-items:center;gap:12px;margin-bottom:10px}
.hi header>div:nth-child(2){flex:1;min-width:0}
.hi small{display:block;color:var(--muted)}
.hi-act{display:flex;gap:6px}
.hi-act .ib{width:auto;min-width:42px;padding:0 12px}
.hi-m{display:grid;grid-template-columns:repeat(auto-fit,minmax(130px,1fr));gap:10px;font-size:.9rem}
.hi-m span{display:block;font-size:.68rem;text-transform:uppercase;letter-spacing:.08em;color:var(--faint);font-weight:650}
.hi-m b{display:block}
.empty{background:var(--surface);border:1.5px dashed var(--line2);border-radius:var(--r);padding:28px 22px;text-align:center}
.empty .btn{margin:4px}
.pl-tbl input.pl-label{width:100%;min-width:170px;min-height:42px;padding:6px 10px;border:1.5px solid var(--line2);border-radius:10px;background:var(--surface);color:var(--text);font:inherit}
.pl-tbl input.pl-waste{width:58px;min-height:42px;padding:6px 8px;border:1.5px solid var(--line2);border-radius:10px;background:var(--surface);color:var(--text);font:inherit;text-align:right}
.pl-tbl td,.pl-tbl th{white-space:normal}
.pl-src{display:block;font-size:.8rem;margin-top:4px;text-align:left}
.pl-total{margin:18px 0}
.pl-total h3{color:var(--panel-m);font-size:.72rem;letter-spacing:.1em;text-transform:uppercase}
.pl-total.res-card{background:var(--panel-bg);border-color:var(--panel-ln);padding:24px 20px 20px;box-shadow:var(--shadow-lg)}
.steps{margin:0 0 1em;padding-left:1.4em}
.steps li{margin:.5em 0;word-break:break-word}
.gloss{margin:0 0 1em}
.gloss dt{font-weight:700;margin-top:16px;scroll-margin-top:90px}
.gloss dd{margin:2px 0 0;max-width:70ch}
.pg-home .sec p{max-width:72ch}
.res-card dl.cols{display:block}
.two{display:grid;gap:12px;min-width:0}
@media (min-width:620px){.two{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}}
.twocol>.two{display:block}

/* ---------- ads (containers exist only when data/ads.json mode != off) ---------- */
.ad{margin:32px calc(var(--pad)*-1);padding:0;text-align:center}
.ad-label{display:block;font-size:11px;letter-spacing:.06em;text-transform:uppercase;color:var(--faint);margin:0 0 8px}
.ad-box{display:flex;justify-content:center;align-items:center;overflow:hidden}
.ad-square,.ad-banner{background:var(--surface);border-block:1px solid var(--line);padding:8px 0}
.ad-prev{border:2px dashed var(--line2);color:var(--muted);padding:40px 20px;font-size:12px}
@media (min-width:760px){.ad{margin-inline:0}.ad-square,.ad-banner{border:1px solid var(--line);border-radius:14px}}
.ad-square{min-height:318px}
.ad-banner{min-height:330px}
@media (min-width:760px){.ad-banner{min-height:128px}}
@media (max-width:359px){.ad-square,.ad-banner{display:none}}
html.ad-sq300 .ad-square,html.ad-sq300 .ad-banner{display:block;min-height:288px}
.page-shell{display:block}
@media (min-width:1500px){.page-shell{display:grid;grid-template-columns:160px minmax(0,1160px) 160px;gap:16px;justify-content:center}.rail-col{position:sticky;top:84px;align-self:start;min-height:620px}.rail-col .ad{margin:32px 0}}
@media (max-width:1499px){.rail-col{display:none}}
.sidebar .ad-square{position:sticky;top:84px}
@media (min-width:1100px){.ad[data-pos="in-2"]:not(.ad-always){display:none}}
@media (min-width:760px){.ad[data-pos="home-3"]{display:none}}
@media (max-width:1099px){.ad[data-pos="home-2"]:not(.ad-always){margin-top:24px}}
.ad:has(ins.adsbygoogle[data-ad-status="unfilled"]){display:none}

/* ---------- print ---------- */
@media print{.site-head,.site-foot,.fab,.res-acts,.acts,.kit,.ad,.rail-col,.sidebar,.crumbs,.presets,.adv,.dlg,.toast,.skip,.switcher,.dock,.seg,.badges,.meta-row .btn,.hero-links{display:none!important}body{background:#fff;color:#000}.calc-in,.result{box-shadow:none;border-color:#999}.result,.pl-total,.hres{background:#fff!important;color:#000!important}.res-num,.res-card dd,.metric .v,.hres-hero .big{color:#000!important}.res-sub,.res-card dt,.res-label{color:#444!important}.layout{display:block}.calc-grid{display:block}.calc-out{position:static;max-height:none;overflow:visible}.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}
.calc-in,.res-card,.side-box,.kit a,.card,.faq details,.math,.recent,.history,.hi,.tbl-wrap,.toc-inline,.note-box,.stat div{border-color:var(--line)}
.calc-in{padding-top:22px}
.calc-bar h2::before{content:"";display:inline-block;width:6px;height:18px;margin-right:10px;border-radius:3px;background:var(--accent);vertical-align:-3px}
label{letter-spacing:.005em}
.res-card h3,.side-box h2,.toc-inline h2,.history h3,.presets-l,.sw-label,.mega-col h3,.mn-group h3,.find-h,.formula h4{color:var(--faint)}
.tbl thead th{background:var(--tint)}
.faq summary:hover{color:var(--accent)}