:root{
  --bg:#EDF0F3; --surface:#FFFFFF; --surface-2:#F5F7F9; --ink:#18202B; --muted:#586475; --line:#D3D9E0; --line-strong:#9AA5B2;
  --tape:#F5C518; --tape-ink:#1E1B0E; --tape-tick:rgba(30,27,14,.55); --tape-soft:#FBEBA6; --bad:#B42318;
  --r-l:20px; --r-m:12px; --r-s:8px;
  color-scheme:light;
  box-sizing:border-box; padding-top:env(safe-area-inset-top,0px); padding-bottom:env(safe-area-inset-bottom,0px);
}
@media (prefers-color-scheme:dark){ :root:not([data-theme="light"]){
  --bg:#13171D; --surface:#1B212A; --surface-2:#212833; --ink:#E7EBF0; --muted:#9AA6B4; --line:#2C3542; --line-strong:#4A5666;
  --tape-soft:#3A3417; --bad:#FF8A7A; color-scheme:dark; } }
:root[data-theme="dark"]{
  --bg:#13171D; --surface:#1B212A; --surface-2:#212833; --ink:#E7EBF0; --muted:#9AA6B4; --line:#2C3542; --line-strong:#4A5666;
  --tape-soft:#3A3417; --bad:#FF8A7A; color-scheme:dark; }
html{scroll-padding-top:env(safe-area-inset-top,0px)}
*,*::before,*::after{box-sizing:inherit}
body{margin:0;background:var(--bg);color:var(--ink);font-family:"Instrument Sans",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;font-size:16px;line-height:1.5;-webkit-font-smoothing:antialiased;font-variant-numeric:tabular-nums}
body.lock{overflow:hidden}
button,input,select{font:inherit;color:inherit}
:focus-visible{outline:2px solid var(--ink);outline-offset:2px}
.wrap{max-width:1180px;margin:0 auto;padding:0 20px}

/* nagłówek */
.top{display:flex;align-items:center;justify-content:space-between;padding:18px 0 6px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:1.2rem;letter-spacing:-.01em;color:inherit;text-decoration:none}
.brand-mark{width:30px;height:30px;border-radius:8px;background:var(--tape);position:relative;overflow:hidden;box-shadow:inset 0 0 0 1.5px rgba(0,0,0,.12)}
.brand-mark::after{content:"";position:absolute;left:4px;right:4px;top:0;height:11px;background:repeating-linear-gradient(90deg,var(--tape-tick) 0 1.5px,transparent 1.5px 5px)}
.icon-btn{display:inline-grid;place-items:center;width:36px;height:36px;border-radius:var(--r-s);border:1px solid transparent;background:none;cursor:pointer;color:var(--muted)}
.icon-btn:hover{color:var(--ink);border-color:var(--line)}

/* hero z paskiem poleceń */
.hero{padding:26px 0 28px}
.hero h1{font-size:clamp(2rem,5vw,3.25rem);line-height:1.02;letter-spacing:-.03em;font-weight:700;margin:0 0 6px;max-width:16ch}
.hero .lede{color:var(--muted);margin:0 0 22px;max-width:60ch}
.cmd{position:relative;max-width:820px}
.cmd svg.lens{position:absolute;left:18px;top:50%;translate:0 -50%;color:var(--muted);pointer-events:none}
.cmd input{width:100%;font-size:clamp(1.1rem,2.3vw,1.35rem);padding:18px 64px 18px 52px;border:2px solid var(--ink);border-radius:var(--r-m);background:var(--surface);outline:none}
.cmd input:focus-visible{box-shadow:0 0 0 4px var(--tape)}
.cmd input::placeholder{color:var(--muted);opacity:.8}
.cmd .kbd-hint{position:absolute;right:16px;top:50%;translate:0 -50%}
kbd{font:inherit;font-size:.78rem;padding:1px 7px;border:1px solid var(--line-strong);border-bottom-width:2px;border-radius:6px;color:var(--muted);background:var(--surface)}
.cmd-out{max-width:820px;margin-top:10px;padding:14px 18px;background:var(--surface);border:1px solid var(--line);border-left:4px solid var(--tape);border-radius:var(--r-m)}
.cmd-answer{font-size:clamp(1.2rem,2.6vw,1.6rem);line-height:1.25}
.cmd-answer .q{color:var(--muted)}
.cmd-answer strong{font-weight:700}
.cmd-meta{color:var(--muted);font-size:.93rem;margin-top:4px}
.cmd-meta strong{color:var(--ink)}
.link{background:none;border:0;padding:0;color:var(--ink);text-decoration:underline;text-underline-offset:3px;cursor:pointer;font-weight:600}
.chips{display:flex;flex-wrap:wrap;gap:8px}
.hero .chips{margin-top:16px;max-width:820px}
.chip{display:inline-block;color:inherit;text-decoration:none;border:1px solid var(--line);background:var(--surface);border-radius:999px;padding:6px 13px;font-size:.9rem;cursor:pointer;white-space:nowrap}
.chip:hover{border-color:var(--ink)}

/* układ */
.layout{display:grid;grid-template-columns:250px minmax(0,1fr);gap:32px;align-items:start;padding-bottom:56px}
.cats{position:sticky;top:calc(14px + env(safe-area-inset-top,0px));max-height:calc(100dvh - 28px);overflow:auto;padding:4px 6px 20px 0;overscroll-behavior:contain}
.cats-head{display:flex;gap:8px;align-items:center}
.cats-head input{flex:1;min-width:0;padding:9px 12px;border:1px solid var(--line);border-radius:var(--r-s);background:var(--surface)}
#navClose{display:none}
.top-actions{display:flex;gap:4px;align-items:center}
#menuBtn{display:none;color:var(--ink)}
.cat-group h3{font-size:.8rem;font-weight:600;color:var(--muted);margin:18px 0 4px 10px;letter-spacing:.01em}
.cat-link{display:block;color:inherit;text-decoration:none;width:100%;text-align:left;padding:6px 10px;border:0;border-radius:var(--r-s);background:none;cursor:pointer;font-size:.94rem;line-height:1.3}
.cat-link:hover{background:var(--surface)}
.cat-link[aria-current="page"]{background:var(--surface);box-shadow:inset 3px 0 0 var(--tape);font-weight:600}
.empty{color:var(--muted);font-size:.9rem;margin:10px 0}

/* panel przelicznika */
.panel{min-width:0;background:var(--surface);border:1px solid var(--line);border-radius:var(--r-l);padding:26px}
.panel-head{display:flex;justify-content:space-between;align-items:flex-start;gap:16px}
.page-title{margin:0;font-size:clamp(1.4rem,3vw,1.9rem);letter-spacing:-.02em;line-height:1.1}
.panel-head p{margin:4px 0 0;color:var(--muted);font-size:.92rem}
#catToggle{display:none}
.btn{display:inline-flex;align-items:center;gap:7px;border:1px solid var(--line);background:var(--surface);padding:8px 13px;border-radius:var(--r-s);font-size:.9rem;cursor:pointer;white-space:nowrap}
.btn:hover{border-color:var(--ink)}
.btn[aria-pressed="true"]{background:var(--tape-soft);border-color:var(--tape)}
.btn[aria-pressed="true"] svg path{fill:var(--tape);stroke:var(--ink)}

.field label{display:block;font-size:.86rem;color:var(--muted);margin-bottom:6px;font-weight:500}
.value-row{margin-top:22px}
#value{width:100%;font-size:1.6rem;font-weight:600;padding:12px 16px;border:1px solid var(--line-strong);border-radius:var(--r-m);background:var(--surface-2)}
#value[aria-invalid="true"]{border-color:var(--bad)}
.hint{font-size:.83rem;color:var(--muted);margin:6px 0 0}
.units-row{display:grid;grid-template-columns:minmax(0,1fr) auto minmax(0,1fr);gap:10px;align-items:end;margin-top:16px}
select{width:100%;appearance:none;padding:12px 38px 12px 14px;border:1px solid var(--line-strong);border-radius:var(--r-m);background:var(--surface-2) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8'%3E%3Cpath d='M1 1l5 5 5-5' fill='none' stroke='%23888' stroke-width='1.8'/%3E%3C/svg%3E") no-repeat right 14px center;cursor:pointer;text-overflow:ellipsis}
#swap{width:46px;height:46px;border-radius:50%;border:1px solid var(--line-strong);background:var(--surface);display:grid;place-items:center;cursor:pointer}
#swap:hover{border-color:var(--ink);background:var(--surface-2)}
#swap.spin svg{animation:spin .35s ease}
@keyframes spin{from{rotate:0deg}to{rotate:180deg}}

/* taśma z wynikiem: jeden wyrazisty element strony */
.tape{margin-top:20px;background:var(--tape);color:var(--tape-ink);border-radius:var(--r-m);padding:38px 22px 18px;position:relative;overflow:hidden}
.tape::before{content:"";position:absolute;left:0;right:0;top:0;height:20px;
  background:repeating-linear-gradient(90deg,var(--tape-tick) 0 1.5px,transparent 1.5px 60px) 12px 0/100% 20px no-repeat,
             repeating-linear-gradient(90deg,var(--tape-tick) 0 1.5px,transparent 1.5px 30px) 12px 0/100% 13px no-repeat,
             repeating-linear-gradient(90deg,var(--tape-tick) 0 1px,transparent 1px 6px) 12px 0/100% 7px no-repeat}
.tape .from-to{font-size:.88rem;opacity:.75;margin-bottom:2px}
.result{font-size:clamp(2rem,6.2vw,3.6rem);font-weight:700;letter-spacing:-.025em;line-height:1.08;overflow-wrap:anywhere}
.result .unit{font-size:.45em;font-weight:600;letter-spacing:0}
.result .placeholder{font-size:.55em;font-weight:600;opacity:.6}
.formula{margin-top:10px;font-size:.93rem;opacity:.85}
.formula .sep{display:inline-block;width:1px;height:.9em;background:currentColor;opacity:.35;margin:0 12px;vertical-align:-1px}
.actions{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-top:14px}
.actions .grow{flex:1}
.prec{display:flex;align-items:center;gap:8px;font-size:.88rem;color:var(--muted)}
.prec select{width:auto;padding:7px 32px 7px 10px;font-size:.88rem;border-radius:var(--r-s)}

.saved{margin-top:26px;display:grid;gap:14px}
.saved h3,.all h3{font-size:1rem;margin:0 0 8px;letter-spacing:-.01em}

/* tabela wszystkich jednostek */
.all{margin-top:28px}
.all-head{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap;margin-bottom:8px}
.all-head h3{margin:0}
.all-head input{padding:8px 12px;border:1px solid var(--line);border-radius:var(--r-s);background:var(--surface-2);min-width:0;width:220px;max-width:100%}
.table-scroll{overflow-x:auto;border:1px solid var(--line);border-radius:var(--r-m)}
table{width:100%;border-collapse:collapse;font-size:.94rem}
tr+tr th,tr+tr td{border-top:1px solid var(--line)}
th,td{padding:0 12px;height:44px;text-align:left;vertical-align:middle}
th{font-weight:500}
.row-pick{background:none;border:0;padding:0;text-align:left;cursor:pointer;line-height:1.25}
.row-pick:hover{text-decoration:underline;text-underline-offset:3px}
td.sym{color:var(--muted);white-space:nowrap}
td.val{text-align:right;font-weight:600;white-space:nowrap}
td.cp{width:44px;padding:0 4px}
tr.is-target{background:var(--tape-soft)}
tr.is-source td.val{color:var(--muted);font-weight:500}

.foot{color:var(--muted);font-size:.86rem;padding:0 0 40px;max-width:70ch}
.toast{position:fixed;left:50%;bottom:calc(20px + env(safe-area-inset-bottom,0px));translate:-50% 20px;opacity:0;background:var(--ink);color:var(--bg);padding:10px 16px;border-radius:var(--r-s);font-size:.9rem;pointer-events:none;transition:opacity .2s,translate .2s;z-index:80;max-width:calc(100% - 40px);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.toast.show{opacity:1;translate:-50% 0}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

@media (max-width:880px){
  .layout{grid-template-columns:minmax(0,1fr)}
  .cats{display:none}
  .cats.open{display:block;position:fixed;inset:0;z-index:60;max-height:none;background:var(--bg);padding:calc(16px + env(safe-area-inset-top,0px)) 20px calc(24px + env(safe-area-inset-bottom,0px))}
  #navClose{display:inline-grid}
  #catToggle{display:inline-flex}
  #menuBtn{display:inline-grid;width:44px;height:44px}
  .panel{padding:20px 16px;border-radius:16px}
  .hero{padding:14px 0 22px}
}
@media (max-width:520px){
  .units-row{grid-template-columns:1fr;gap:8px}
  #swap{justify-self:center;rotate:90deg}
  .cmd .kbd-hint{display:none}
  .hero .chips{flex-wrap:nowrap;overflow-x:auto;margin-right:-20px;padding-right:20px;scrollbar-width:none}
  .cmd input{padding-right:16px}
  .all-head input{width:100%}
  .actions .grow{display:none}
  .actions .btn{flex:1 1 40%;justify-content:center}
  .prec{flex:1 1 100%;justify-content:flex-end}
  td.sym{display:none}
  th,td{padding:0 10px}
}
@media (prefers-reduced-motion:reduce){ *{animation:none!important;transition:none!important;scroll-behavior:auto!important} }

.hero.compact{padding:10px 0 22px}
.crumbs{font-size:.88rem;color:var(--muted);margin:0 0 10px}
.crumbs a{color:inherit;text-underline-offset:3px}
.crumbs span[aria-hidden]{margin:0 6px;opacity:.6}
.sec{margin-top:34px}
.sec h2{font-size:1.25rem;letter-spacing:-.015em;line-height:1.25;margin:0 0 12px}
.sec p{margin:10px 0;max-width:72ch}
.formula-box{display:flex;gap:4px 14px;align-items:baseline;flex-wrap:wrap;padding:14px 18px;border:1px solid var(--line);border-left:4px solid var(--tape);border-radius:var(--r-m);background:var(--surface-2)}
.formula-box code{font:inherit;font-weight:700;font-size:clamp(1.05rem,2.2vw,1.3rem);overflow-wrap:anywhere}
.lbl{display:inline-block;font-size:.8rem;font-weight:600;color:var(--muted);margin-right:10px;min-width:max-content}
.example strong{font-weight:700}
.derive,.rev{color:var(--muted)}
table.values{max-width:560px}
table.values th,table.values td{height:36px;text-align:right}
table.values th:first-child,table.values td:first-child{text-align:left}
table.values thead th{font-weight:600;font-size:.88rem;color:var(--muted);background:var(--surface-2)}
table.values tbody tr:nth-child(even){background:var(--surface-2)}
table.defs th,table.defs td{height:auto;padding:9px 12px;line-height:1.35}
table.defs thead th{font-weight:600;font-size:.88rem;color:var(--muted);background:var(--surface-2)}
.values .table-scroll,.sec .table-scroll{display:inline-block;max-width:100%}
@media (max-width:520px){ table.defs td.sym{display:table-cell} .sec .table-scroll{display:block} }

.note{background:var(--surface-2);border:1px solid var(--line);border-radius:var(--r-s);padding:10px 14px;font-size:.92rem;color:var(--muted)}
details.faq{border:1px solid var(--line);border-radius:var(--r-s);padding:0 14px;margin:8px 0;background:var(--surface)}
details.faq summary{cursor:pointer;padding:12px 0;font-weight:600;list-style-position:outside}
details.faq p{margin:0 0 12px}
.foot a{color:inherit}
.about{max-width:820px;margin:0 auto 60px}.about h2{font-size:1.2rem;margin:28px 0 8px}.about p{max-width:72ch}

.panel.tool .lead{font-size:1.05rem;margin:8px 0 18px;max-width:70ch}
.tool-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin-bottom:14px}
.tool-grid.three{grid-template-columns:repeat(3,minmax(0,1fr))}
.tool-grid input,.tool-grid select,.panel.tool textarea,.price-row input,.price-row select{width:100%;font:inherit;padding:11px 13px;border:1px solid var(--line-strong);border-radius:var(--r-m);background:var(--surface-2);color:var(--ink)}
.panel.tool textarea{resize:vertical;line-height:1.5}
.tool-grid fieldset{border:1px solid var(--line);border-radius:var(--r-m);padding:12px 14px;margin:0;display:grid;gap:10px}
.tool-grid legend{font-size:.86rem;color:var(--muted);font-weight:500;padding:0 4px}
.dims{display:flex;align-items:center;gap:8px}.dims input{max-width:110px}.dims span{color:var(--muted)}
.panel.tool .tape{margin:16px 0}
.h3{font-size:1.05rem;margin:22px 0 8px}
ul.scaled{margin:0;padding-left:1.2em;display:grid;gap:4px}ul.scaled li.unscaled{color:var(--muted)}
.price-head,.price-row{display:grid;grid-template-columns:minmax(0,2fr) minmax(0,1fr) auto minmax(0,1fr) 80px;gap:8px;align-items:center;margin-bottom:8px}
.price-head{font-size:.82rem;color:var(--muted)}
table.price tr.best{background:var(--tape-soft)}
.badge{display:inline-block;font-size:.72rem;font-weight:700;background:var(--tape);color:var(--tape-ink);border-radius:999px;padding:1px 8px;margin-left:6px;vertical-align:1px}
table.values.price td,table.values.price th{text-align:right}table.values.price td:first-child,table.values.price th:first-child{text-align:left}
table.matrix td,table.matrix th{text-align:center!important;padding:0 8px}table.matrix td.same{background:var(--tape-soft);font-weight:700}
table.pace{max-width:none}
@media (max-width:520px){
  .tool-grid,.tool-grid.three{grid-template-columns:1fr}
  .price-head{display:none}
  .price-row{grid-template-columns:minmax(0,1fr) auto minmax(0,1fr) 72px;padding:10px;border:1px solid var(--line);border-radius:var(--r-m)}
  .price-row .pn{grid-column:1/-1}
}