:root{--ink:#102a43;--muted:#5c6f82;--paper:#f4f8fb;--card:#fff;--line:#dbe6ee;--navy:#173f5f;--blue:#20639b;--teal:#2a9d8f;--orange:#f4a261;--red:#d1495b;--shadow:0 24px 70px rgba(23,63,95,.13);--radius:24px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--ink);font-family:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",sans-serif;line-height:1.65}button,input,textarea{font:inherit}button{cursor:pointer}.kc-shell{width:min(1160px,calc(100% - 34px));margin-inline:auto}.kc-skip{position:fixed;left:16px;top:-80px;z-index:9999;background:#fff;color:var(--ink);padding:10px 14px;border-radius:10px;box-shadow:var(--shadow)}.kc-skip:focus{top:16px}.kc-topbar{position:sticky;top:0;z-index:50;background:rgba(244,248,251,.92);backdrop-filter:blur(14px);border-bottom:1px solid rgba(219,230,238,.85)}.kc-topbar__inner{height:74px;display:flex;align-items:center;justify-content:space-between;gap:24px}.kc-logo{display:flex;align-items:center;gap:12px;color:var(--ink);text-decoration:none;font-weight:850;letter-spacing:-.02em}.kc-logo__symbol{width:44px;height:44px;border-radius:14px;background:var(--navy);color:#fff;display:grid;grid-template-columns:1fr 1fr;place-items:center;font-size:14px;box-shadow:0 8px 24px rgba(23,63,95,.22)}.kc-logo__text{font-size:1.05rem}.kc-navigation{display:flex;align-items:center;gap:8px}.kc-navigation a{color:#385269;text-decoration:none;padding:9px 12px;border-radius:10px;font-weight:700;font-size:.94rem}.kc-navigation a:hover{background:#e8f1f6;color:var(--navy)}.kc-nav-toggle{display:none;border:0;background:transparent;padding:8px}.kc-nav-toggle span{display:block;width:24px;height:2px;background:var(--ink);margin:5px}.kc-intro{position:relative;overflow:hidden;background:linear-gradient(135deg,#eef7f9 0%,#f8fbfd 52%,#fff3e8 100%);border-bottom:1px solid var(--line)}.kc-intro:after{content:"";position:absolute;width:430px;height:430px;border-radius:50%;right:-180px;top:-210px;background:radial-gradient(circle,rgba(42,157,143,.16),transparent 68%)}.kc-intro__grid{position:relative;z-index:1;display:grid;grid-template-columns:minmax(0,1.5fr) minmax(280px,.75fr);gap:58px;align-items:center;padding:78px 0 82px}.kc-overline,.kc-label{margin:0 0 12px;color:var(--teal);font-size:.76rem;font-weight:900;letter-spacing:.14em}.kc-intro h1{font-size:clamp(2.5rem,6vw,5.2rem);line-height:1.02;letter-spacing:-.055em;margin:0;max-width:800px}.kc-intro__lead{font-size:1.18rem;color:var(--muted);max-width:700px;margin:24px 0}.kc-intro__points{display:flex;flex-wrap:wrap;gap:9px;margin-bottom:26px}.kc-intro__points span{background:#fff;border:1px solid var(--line);border-radius:999px;padding:7px 11px;font-weight:750;font-size:.87rem}.kc-primary-link{display:inline-flex;gap:10px;align-items:center;background:var(--navy);color:#fff;padding:12px 17px;border-radius:12px;text-decoration:none;font-weight:800}.kc-intro__note{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px;box-shadow:var(--shadow);transform:rotate(1.2deg)}.kc-intro__note strong{font-size:1.05rem}.kc-intro__note p{color:var(--muted)}.kc-key-row{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin-top:18px}.kc-key-row kbd{display:grid;place-items:center;height:46px;border:1px solid #cad8e2;border-bottom-width:4px;border-radius:10px;background:#f8fbfd;font-weight:800}.kc-calculator-zone{padding:70px 0}.kc-tool-frame{background:var(--card);border:1px solid var(--line);border-radius:30px;box-shadow:var(--shadow);overflow:hidden}.kc-tool-frame__top{display:flex;justify-content:space-between;align-items:end;gap:30px;padding:30px 34px;border-bottom:1px solid var(--line);background:#fbfdfe}.kc-tool-frame__top h2{margin:0 0 8px;font-size:clamp(1.65rem,3vw,2.3rem);letter-spacing:-.035em}.kc-tool-frame__top p{margin:0;color:var(--muted);max-width:720px}.kc-mode-tabs{display:flex;padding:5px;background:#eaf1f5;border-radius:13px;flex-shrink:0}.kc-mode-tab{border:0;background:transparent;color:#486177;padding:10px 14px;border-radius:9px;font-weight:850}.kc-mode-tab.is-active{background:#fff;color:var(--navy);box-shadow:0 4px 14px rgba(23,63,95,.1)}.kc-tool-stage{padding:34px;background:linear-gradient(180deg,#f4f8fb,#edf4f7)}.calculator-view[hidden]{display:none!important}.kc-device{max-width:610px;margin:auto;background:#173f5f;border-radius:26px;padding:20px;box-shadow:0 24px 55px rgba(16,42,67,.25)}.kc-device--science{max-width:1040px}.kc-screen{position:relative;background:#eaf4df;border:7px solid #0f334d;border-radius:18px;padding:17px 18px 14px;min-height:106px;box-shadow:inset 0 3px 12px rgba(15,51,77,.13)}.kc-screen__expression{height:25px;text-align:right;color:#526452;overflow:hidden;white-space:nowrap}.kc-screen__result{width:100%;border:0;background:transparent;text-align:right;color:#172f24;font-size:2.5rem;font-weight:850;outline:0}.kc-memory-flag{position:absolute;left:17px;bottom:13px;font-size:.72rem;font-weight:900}.kc-memory-pad{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin:16px 0 10px}.kc-basic-pad,.kc-science-pad{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}.kc-key{min-height:58px;border:0;border-radius:14px;background:#fff;color:var(--ink);font-weight:850;font-size:1.05rem;box-shadow:0 5px 0 #c7d6df;transition:transform .08s,box-shadow .08s}.kc-key:hover{filter:brightness(.98)}.kc-key:active{transform:translateY(4px);box-shadow:0 1px 0 #c7d6df}.kc-key--memory{min-height:44px;background:#d7e9ef;color:var(--navy);box-shadow:0 4px 0 #a8c3d0}.kc-key--soft{background:#e7eef2}.kc-key--operator{background:var(--orange);color:#3a250f;box-shadow:0 5px 0 #c87c34}.kc-key--equals{background:var(--teal);color:#fff;box-shadow:0 5px 0 #197266}.kc-key--danger{background:#f7d8dc;color:#8e2635;box-shadow:0 5px 0 #d9a9b0}.kc-key--zero{grid-column:span 2}.kc-tool-help{text-align:center;color:var(--muted);margin:18px 0 0;font-size:.93rem}.kc-science-bar{display:flex;justify-content:space-between;gap:14px;margin-bottom:12px}.angle-switch{display:flex;background:#0f334d;border-radius:10px;padding:4px}.angle-switch button,.science-history-button,.science-control{border:0;border-radius:8px;padding:8px 12px;font-weight:850}.angle-switch button{background:transparent;color:#a9c5d7}.angle-switch button.is-active{background:#fff;color:var(--navy)}.science-history-button,.science-control{background:#dceaf0;color:var(--navy)}.kc-screen--science{min-height:125px}.scientific-expression{width:100%;border:0;background:transparent;color:#314b3b;outline:0;font-size:1.05rem}.scientific-result{display:block;text-align:right;font-size:2.4rem;font-weight:850;color:#172f24;min-height:54px}.scientific-status{font-size:.78rem;color:#607660}.science-history{margin:12px 0;background:#fff;border-radius:14px;padding:14px}.science-history-head{display:flex;justify-content:space-between;gap:12px}.science-history-head button{border:0;background:transparent;color:var(--red);font-weight:750}.science-history-item{padding:9px 0;border-bottom:1px solid var(--line)}.science-history-item:last-child{border-bottom:0}.science-empty{color:var(--muted);margin:10px 0}.kc-science-layout{display:grid;grid-template-columns:1.25fr .9fr;gap:14px;margin-top:14px}.kc-function-bank{display:grid;gap:12px}.kc-function-group{background:#0f334d;border-radius:16px;padding:14px}.kc-function-group h3{color:#c8dce8;margin:0 0 10px;font-size:.8rem;text-transform:uppercase;letter-spacing:.08em}.kc-function-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}.kc-function-grid button{border:0;background:#fff;color:var(--navy);min-height:48px;border-radius:10px;font-weight:850}.kc-science-side{display:flex;flex-direction:column;gap:10px}.kc-science-actions{display:grid;grid-template-columns:1fr 1fr;gap:10px}.kc-short-guide{padding:10px 0 80px}.kc-section-heading{margin-bottom:24px}.kc-section-heading h2{font-size:clamp(1.8rem,4vw,2.7rem);letter-spacing:-.04em;margin:0}.kc-section-heading p:last-child{color:var(--muted)}.kc-section-heading--center{text-align:center;max-width:720px;margin:0 auto 30px}.kc-step-grid{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.kc-step-grid li{background:#fff;border:1px solid var(--line);border-radius:20px;padding:24px}.kc-step-grid span{display:inline-grid;place-items:center;width:42px;height:42px;border-radius:50%;background:#e3f3f0;color:#14766c;font-weight:900}.kc-step-grid strong{display:block;font-size:1.08rem;margin:15px 0 6px}.kc-step-grid p{color:var(--muted);margin:0}.kc-content-zone{padding:76px 0;background:#fff;border-block:1px solid var(--line)}.kc-content-layout{display:grid;gap:55px;align-items:start}.kc-prose{font-size:1.02rem;color:#28445a}.kc-prose h2{color:var(--ink);font-size:clamp(1.55rem,3vw,2.25rem);letter-spacing:-.035em;margin-top:2em}.kc-prose h3{color:var(--ink);font-size:1.3rem;margin-top:1.7em}.kc-prose a{color:var(--blue)}.kc-prose ul,.kc-prose ol{padding-left:1.25rem}.kc-content-aside,.kc-side-faq{position:sticky;top:96px;background:#f2f7fa;border:1px solid var(--line);border-radius:18px;padding:22px}.kc-content-aside ul{padding-left:18px;margin-bottom:0}.kc-faq-zone{padding:80px 0}.kc-faq-list{max-width:900px;margin:auto;display:grid;gap:12px}.kc-faq-list details,.kc-side-faq details{background:#fff;border:1px solid var(--line);border-radius:15px;padding:0 18px}.kc-faq-list summary,.kc-side-faq summary{cursor:pointer;list-style:none;font-weight:850;padding:18px 0;display:flex;justify-content:space-between;gap:16px}.kc-faq-list details p,.kc-side-faq details p{color:var(--muted);margin:0 0 18px}.kc-page-head{background:linear-gradient(135deg,#eaf5f6,#fff6ed);border-bottom:1px solid var(--line)}.kc-page-head__inner{padding:56px 0}.kc-breadcrumbs{display:flex;gap:8px;color:var(--muted);font-size:.9rem;margin-bottom:24px}.kc-breadcrumbs a{color:var(--blue)}.kc-page-head h1{font-size:clamp(2.2rem,5vw,4rem);letter-spacing:-.05em;line-height:1.05;margin:0}.kc-page-intro{max-width:760px;color:var(--muted);font-size:1.1rem;margin-top:18px}.kc-document-zone{padding:64px 0 90px}.kc-document-grid{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:48px;align-items:start}.kc-prose--document{background:#fff;border:1px solid var(--line);border-radius:22px;padding:clamp(24px,5vw,48px)}.kc-contact-form{margin-top:32px;padding-top:28px;border-top:1px solid var(--line);display:grid;gap:18px}.kc-form-row{display:grid;grid-template-columns:1fr 1fr;gap:16px}.kc-contact-form label{display:grid;gap:7px;font-weight:800}.kc-contact-form input,.kc-contact-form textarea{width:100%;border:1px solid #c9d8e2;border-radius:12px;padding:12px;background:#fbfdfe;color:var(--ink)}.kc-contact-form input:focus,.kc-contact-form textarea:focus{outline:3px solid rgba(32,99,155,.15);border-color:var(--blue)}.kc-submit{justify-self:start;border:0;background:var(--navy);color:#fff;padding:12px 18px;border-radius:11px;font-weight:850}.hp-field{position:absolute!important;left:-9999px!important}.kc-alert{padding:13px 15px;border-radius:12px;margin-top:20px}.kc-alert.is-success{background:#dff4ea;color:#176a4c}.kc-alert.is-error{background:#fde5e8;color:#942e3b}.kc-footer{background:#102a43;color:#d8e5ed}.kc-footer__main{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:36px;padding:46px 0}.kc-footer strong{color:#fff}.kc-footer p{margin:8px 0 0}.kc-footer__links{display:flex;flex-wrap:wrap;align-content:start;gap:8px 16px}.kc-footer a{color:#d8e5ed}.kc-footer__note{text-align:right;font-size:.88rem;color:#9fb7c7}@media(max-width:860px){.kc-nav-toggle{display:block}.kc-navigation{display:none;position:absolute;left:17px;right:17px;top:68px;background:#fff;border:1px solid var(--line);border-radius:16px;padding:10px;box-shadow:var(--shadow);flex-direction:column;align-items:stretch}.kc-navigation.is-open{display:flex}.kc-intro__grid,.kc-content-layout,.kc-document-grid{grid-template-columns:1fr}.kc-intro__grid{padding:56px 0}.kc-intro__note{transform:none}.kc-tool-frame__top{align-items:stretch;flex-direction:column}.kc-mode-tabs{align-self:flex-start}.kc-science-layout{grid-template-columns:1fr}.kc-content-aside,.kc-side-faq{position:static}.kc-footer__main{grid-template-columns:1fr 1fr}.kc-footer__note{text-align:left}}@media(max-width:620px){.kc-shell{width:min(100% - 22px,1160px)}.kc-logo__text{font-size:.92rem}.kc-intro h1{font-size:2.7rem}.kc-intro__points{display:grid}.kc-tool-stage,.kc-tool-frame__top{padding:18px}.kc-device{padding:12px;border-radius:19px}.kc-screen{border-width:5px}.kc-screen__result,.scientific-result{font-size:2rem}.kc-key{min-height:52px;border-radius:11px}.kc-memory-pad,.kc-basic-pad,.kc-science-pad{gap:7px}.kc-step-grid{grid-template-columns:1fr}.kc-function-grid{grid-template-columns:repeat(2,1fr)}.kc-form-row{grid-template-columns:1fr}.kc-footer__main{grid-template-columns:1fr}.kc-footer__links{flex-direction:column}.kc-page-head__inner{padding:42px 0}.kc-prose--document{padding:22px}}
/* KalkulackaOnline V3 calculator */
.kc-v3-zone{padding:56px 0}.kc-v3-wrap{max-width:100%;margin:auto}.kc-v3-heading{margin-bottom:24px}.kc-v3-calculator{width:min(100%,430px);margin:0 auto;background:#ececec;border-radius:16px;padding:12px;box-shadow:0 18px 50px rgba(15,23,42,.14);border:1px solid #d8d8d8}.kc-v3-calculator--science{width:min(100%,470px)}.kc-v3-brandrow{display:flex;justify-content:space-between;align-items:center;color:#68707a;font-size:.78rem;padding:0 2px 8px}.kc-v3-screen{position:relative;background:#c8c8c8;padding:9px 12px;margin-bottom:7px}.kc-v3-expression,.kc-v3-expression-input{display:block;width:100%;min-height:24px;border:0;background:transparent;text-align:right;color:#3f4650;font-size:.9rem;outline:0}.kc-v3-result{display:block;width:100%;min-height:62px;padding:10px 8px;border:2px solid #555;background:#c9bd8c;color:#050505;text-align:right;font-size:2rem;font-weight:800;overflow:hidden}.kc-v3-status{position:absolute;left:16px;bottom:13px;font-size:.7rem;font-weight:700}.kc-v3-subrow{display:flex;justify-content:space-between;align-items:center;padding:0 8px 10px;color:#0055a5;font-size:.88rem}.kc-v3-subrow button{border:0;background:none;color:#0055a5;padding:0;cursor:pointer}.kc-v3-rounding,.kc-v3-science-meta{display:flex;justify-content:space-between;align-items:end;padding:0 8px 8px;font-size:.68rem}.kc-v3-rounding label{display:block}.kc-v3-rounding select,.kc-v3-science-meta select{display:block;margin-top:2px}.kc-v3-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:7px}.kc-v3-key,.kc-v3-science-tools button{min-height:42px;border-radius:9px;border:1px solid #aaa;background:linear-gradient(#fff,#c4c4c4);box-shadow:inset 0 1px #fff,0 2px 1px rgba(0,0,0,.18);font-weight:800;font-size:1.02rem;cursor:pointer}.kc-v3-key:active,.kc-v3-science-tools button:active{transform:translateY(1px)}.kc-v3-key--operator{background:linear-gradient(#a9caff,#6f9ff3);border-color:#73a1ee}.kc-v3-key--clear{background:linear-gradient(#f31535,#c70020);color:#fff;border-color:#b4001b;font-size:1.35rem}.kc-v3-key--plus{grid-column:4/6}.kc-v3-science-tools{display:grid;grid-template-columns:repeat(6,1fr);gap:7px;margin:5px 0 12px}.kc-v3-science-tools button{min-height:34px;font-size:.82rem;background:linear-gradient(#fff1b5,#ffbd28);border-color:#e7aa20}.kc-v3-science-meta{align-items:center}.kc-angle-switch{display:flex;gap:4px}.kc-angle-switch button{border:1px solid #aaa;background:#fff;border-radius:5px;padding:4px 7px}.kc-angle-switch .is-active{background:#245ea8;color:#fff}.kc-rate-panel{margin:0 8px 10px;padding:8px;border:1px solid #d1d5db;background:#fff;border-radius:8px}.kc-rate-panel label{display:flex;justify-content:space-between;gap:10px}.kc-rate-panel input{width:110px}.science-history{margin-top:12px;background:#fff;border-radius:9px;padding:10px}.science-history-head{display:flex;justify-content:space-between}.science-history-list button,#science-history-list button{width:100%;display:flex;justify-content:space-between;border:0;border-bottom:1px solid #eee;background:none;padding:8px;text-align:left}.calculator-view[hidden]{display:none!important}@media(max-width:560px){.kc-v3-calculator,.kc-v3-calculator--science{width:100%;padding:10px}.kc-v3-grid{gap:5px}.kc-v3-key{min-height:39px;font-size:.92rem}.kc-v3-science-tools{gap:5px}.kc-v3-science-tools button{font-size:.72rem;min-height:32px}.kc-v3-result{font-size:1.7rem}}

/* v3.0.1 — keypad alignment correction */
.kc-v3-grid--basic > .kc-v3-key--clear{
  grid-column:span 2;
}
.kc-v3-grid--basic > .kc-v3-key--plus{
  grid-column:span 2;
}
.kc-v3-grid--basic{
  grid-auto-flow:row;
}
.kc-v3-key{
  min-width:0;
}
@media (max-width:560px){
  .kc-v3-grid--basic{
    grid-template-columns:repeat(5,minmax(0,1fr));
  }
}

/* v4.0.0 — shared calculation history for basic and scientific modes */
.kc-history-workbench{display:grid;grid-template-columns:minmax(0,1fr) 390px;gap:42px;align-items:start}
.kc-workbench-main{min-width:0}
.kc-history-workbench .kc-tool-help{grid-column:1/-1;text-align:center;margin:2px 0 0}
.kc-history-pad{position:sticky;top:92px;min-width:0;padding-top:18px}
.kc-history-rings{position:absolute;z-index:3;top:0;left:20px;right:20px;height:34px;background:repeating-linear-gradient(90deg,transparent 0 18px,#253443 18px 23px,transparent 23px 35px);filter:drop-shadow(0 2px 1px rgba(0,0,0,.2));pointer-events:none}
.kc-history-rings:after{content:"";position:absolute;left:0;right:0;top:13px;height:8px;background:repeating-linear-gradient(90deg,transparent 0 16px,#eef3f5 16px 25px,transparent 25px 35px);border-radius:9px}
.kc-history-paper{min-height:430px;padding:32px 22px 22px;border:1px solid #e9e1a7;border-radius:3px;background-color:#fffde8;background-image:linear-gradient(to bottom,transparent 31px,#dfe7e3 32px);background-size:100% 32px;box-shadow:0 10px 24px rgba(27,43,58,.13);overflow:hidden}
.kc-history-head{display:flex;justify-content:space-between;gap:14px;align-items:flex-start;min-height:64px;padding-bottom:9px;border-bottom:1px solid rgba(50,100,130,.13)}
.kc-history-head strong{display:block;color:#152e41;font-size:1.02rem}
.kc-history-head span{display:block;margin-top:3px;color:#44708a;font-size:.76rem}
.kc-history-head time{color:#397fb3;font-size:.72rem;white-space:nowrap}
.kc-history-list{max-height:430px;overflow:auto;padding-right:4px}
.kc-history-empty{margin:20px 0;color:#7f8d83;font-size:.9rem}
.kc-history-item{position:relative;display:grid;grid-template-columns:52px minmax(0,1fr);grid-template-areas:"time expression" "time result";column-gap:10px;min-height:64px;padding:8px 30px 7px 0;border-bottom:1px solid rgba(50,100,130,.1);cursor:pointer;outline:none}
.kc-history-item:hover,.kc-history-item:focus{background:rgba(255,255,255,.55)}
.kc-history-item__time{grid-area:time;color:#6591aa;font-size:.69rem;padding-top:4px}
.kc-history-item__expression{grid-area:expression;overflow-wrap:anywhere;color:#344b58;font-size:.88rem}
.kc-history-item__result{grid-area:result;color:#102a43;font-weight:850;font-size:1rem;overflow-wrap:anywhere}
.kc-history-delete{display:none;position:absolute;right:2px;top:18px;width:25px;height:25px;border:0;border-radius:50%;background:#d62f45;color:#fff;font-weight:900;cursor:pointer}
.kc-history-list.is-editing .kc-history-delete{display:block}
.kc-history-list.is-editing .kc-history-item{cursor:default}
.kc-history-actions{display:grid;grid-template-columns:repeat(4,1fr);gap:7px;margin-top:18px}
.kc-history-actions button{display:grid;place-items:center;gap:2px;min-height:55px;padding:7px 3px;border:1px solid #cfd6db;border-radius:7px;background:linear-gradient(#fff,#edf0f2);color:#243746;font-size:.72rem;font-weight:750;cursor:pointer}
.kc-history-actions button span{font-size:1.14rem;color:#de9b11}
.kc-history-actions button:hover,.kc-history-actions button.is-active{border-color:#7ea6c3;background:#e7f2f8}
@media(max-width:980px){.kc-history-workbench{grid-template-columns:1fr}.kc-history-pad{position:relative;top:auto;width:min(100%,560px);margin:0 auto}.kc-history-paper{min-height:300px}.kc-history-list{max-height:310px}}
@media(max-width:560px){.kc-history-workbench{gap:26px}.kc-history-paper{padding:30px 15px 16px}.kc-history-actions{grid-template-columns:repeat(2,1fr)}.kc-history-head{display:block}.kc-history-head time{display:block;margin-top:5px}.kc-history-item{grid-template-columns:45px minmax(0,1fr)}}

/* V4.1: přepínatelná historie a centrování kalkulačky */
.kc-history-workbench{transition:grid-template-columns .22s ease}
.kc-history-workbench.is-history-hidden{grid-template-columns:minmax(0,1fr)}
.kc-history-workbench.is-history-hidden .kc-workbench-main{width:100%;display:flex;justify-content:center}
.kc-history-workbench.is-history-hidden .calculator-view{width:100%}
.kc-history-workbench.is-history-hidden .kc-history-pad{display:none}
.kc-history-toggle{position:relative;font-weight:700}
.kc-history-toggle::before{content:"";display:inline-block;width:7px;height:7px;margin-right:6px;border-radius:50%;background:#98a4af;vertical-align:1px}
.kc-history-toggle.is-active::before{background:#2a9d8f;box-shadow:0 0 0 3px rgba(42,157,143,.14)}
.kc-history-toggle:focus-visible{outline:2px solid #20639b;outline-offset:3px;border-radius:4px}
@media(max-width:980px){.kc-history-workbench.is-history-hidden .kc-workbench-main{display:block}.kc-history-workbench.is-history-hidden .calculator-view{width:auto}}


/* V4.2.0 — editable calculation tape and functional calculator sizes */
.kc-size-switch{display:flex;align-items:center;gap:3px}
.kc-size-switch button{display:grid;place-items:center;width:22px;height:22px;padding:0;border:1px solid transparent;border-radius:4px;background:transparent;color:#66717b;font:800 13px/1 Arial,sans-serif;cursor:pointer}
.kc-size-switch button:hover{border-color:#b9c2c9;background:#f7f9fa}
.kc-size-switch button.is-active{border-color:#6c8598;background:#fff;color:#173f5f;box-shadow:0 1px 2px rgba(15,42,61,.12)}
.kc-size-switch button:focus-visible{outline:2px solid #20639b;outline-offset:2px}
.kc-v3-calculator{transition:width .2s ease,padding .2s ease}
.kc-v3-calculator.is-size-compact{width:min(100%,370px);padding:10px}
.kc-v3-calculator--science.is-size-compact{width:min(100%,405px)}
.kc-v3-calculator.is-size-normal{width:min(100%,430px)}
.kc-v3-calculator--science.is-size-normal{width:min(100%,470px)}
.kc-v3-calculator.is-size-large{width:min(100%,500px);padding:14px}
.kc-v3-calculator--science.is-size-large{width:min(100%,550px)}
.kc-v3-calculator.is-size-large .kc-v3-key{min-height:47px;font-size:1.1rem}
.kc-v3-calculator.is-size-large .kc-v3-result{min-height:72px;font-size:2.25rem}
.kc-v3-calculator.is-size-compact .kc-v3-key{min-height:37px;font-size:.92rem}
.kc-v3-calculator.is-size-compact .kc-v3-result{min-height:54px;font-size:1.72rem}
.kc-history-editor{display:block;width:100%;height:430px;min-height:250px;padding:10px 4px;border:0;outline:0;resize:none;background:transparent;color:#263b48;font:15px/32px ui-monospace,SFMono-Regular,Consolas,"Liberation Mono",monospace;white-space:pre-wrap;overflow:auto;caret-color:#0a5c9c}
.kc-history-editor[hidden]{display:none!important}
.kc-history-list[hidden]{display:none!important}
.kc-history-paper:has(.kc-history-editor:not([hidden])){box-shadow:0 10px 24px rgba(27,43,58,.13),inset 0 0 0 2px rgba(32,99,155,.12)}
.kc-history-actions [data-history-action="edit"].is-active{border-color:#3e8bbb;background:#e5f4fc;color:#173f5f}
.kc-history-item{grid-template-areas:"time expression" "time result";padding-right:6px}
.kc-history-item__result:empty{display:none}
@media(max-width:560px){
  .kc-v3-calculator.is-size-compact,.kc-v3-calculator.is-size-normal,.kc-v3-calculator.is-size-large,.kc-v3-calculator--science.is-size-compact,.kc-v3-calculator--science.is-size-normal,.kc-v3-calculator--science.is-size-large{width:100%}
  .kc-history-editor{height:310px;font-size:14px}
}

/* V4.3.0 — distinct modern calculator skin, equal history controls, exact top alignment */
.kc-v3-zone .kc-tool-stage{
  padding:42px clamp(18px,4vw,48px);
  background:
    radial-gradient(circle at 15% 12%,rgba(42,157,143,.10),transparent 28%),
    radial-gradient(circle at 88% 8%,rgba(244,162,97,.10),transparent 26%),
    linear-gradient(180deg,#f8fbfd 0%,#edf5f7 100%);
}
.kc-history-workbench{
  --history-width:390px;
  display:grid;
  grid-template-columns:max-content var(--history-width);
  justify-content:center;
  align-items:start;
  gap:clamp(28px,4vw,56px);
}
.kc-workbench-main,.calculator-view{min-width:0}
.kc-workbench-main{display:block}
.calculator-view.is-active{display:flex;justify-content:center;align-items:flex-start}
.kc-history-pad{
  position:relative;
  top:auto;
  width:var(--history-width);
  min-width:0;
  padding-top:0;
  align-self:start;
}

/* Calculator deliberately differs from kalkula.cz: flat dark shell, clean keys, no metallic gradients. */
.kc-v3-calculator{
  --calc-accent:#2a9d8f;
  --calc-shell:#173f5f;
  --calc-shell-2:#102f48;
  --calc-key:#ffffff;
  --calc-key-border:#c9d8e1;
  margin:0;
  border:0;
  border-radius:24px;
  padding:16px;
  background:linear-gradient(145deg,var(--calc-shell),var(--calc-shell-2));
  box-shadow:0 24px 54px rgba(16,42,67,.24),inset 0 1px rgba(255,255,255,.13);
}
.kc-v3-calculator--science{--calc-accent:#f4a261}
.kc-v3-brandrow{padding:0 2px 12px;color:#dcebf3}
.kc-v3-brandrow strong{font-size:.75rem;letter-spacing:.12em}
.kc-size-switch{gap:6px}
.kc-size-switch button{
  width:24px;height:24px;border:1px solid rgba(255,255,255,.18);border-radius:7px;
  background:rgba(255,255,255,.07);color:#bfd2df;font-size:12px;
}
.kc-size-switch button:hover{background:rgba(255,255,255,.15);border-color:rgba(255,255,255,.35)}
.kc-size-switch button.is-active{background:#fff;color:#173f5f;border-color:#fff;box-shadow:none}
.kc-v3-screen{
  margin:0 0 11px;padding:11px;border:1px solid rgba(255,255,255,.22);border-radius:16px;
  background:#dbe8cc;box-shadow:inset 0 3px 10px rgba(28,53,32,.18);
}
.kc-v3-result{
  min-height:68px;border:0;border-radius:10px;background:#eff6df;color:#172f24;
  box-shadow:inset 0 0 0 1px rgba(37,74,44,.18);font-variant-numeric:tabular-nums;
}
.kc-v3-expression,.kc-v3-expression-input{color:#536b57}
.kc-v3-status{color:#416247}
.kc-v3-subrow{padding:0 2px 10px;font-size:.82rem}
.kc-v3-subrow button{color:#d7e9f2;font-weight:750}
.kc-history-toggle::before{background:#8096a6}
.kc-history-toggle.is-active::before{background:#55d6c2;box-shadow:0 0 0 3px rgba(85,214,194,.16)}
.kc-v3-rounding,.kc-v3-science-meta{padding:0 2px 9px;color:#d7e4ec}
.kc-v3-rounding select,.kc-v3-science-meta select{border:1px solid rgba(255,255,255,.25);border-radius:7px;background:#fff;color:#173f5f;padding:2px 5px}
.kc-v3-grid{gap:8px}
.kc-v3-key,.kc-v3-science-tools button{
  min-height:43px;border:1px solid var(--calc-key-border);border-radius:12px;
  background:var(--calc-key);color:#173047;box-shadow:0 3px 0 #aebfca;
  font-weight:850;font-size:1rem;transition:transform .08s ease,box-shadow .08s ease,filter .12s ease;
}
.kc-v3-key:hover,.kc-v3-science-tools button:hover{filter:brightness(.97)}
.kc-v3-key:active,.kc-v3-science-tools button:active{transform:translateY(2px);box-shadow:0 1px 0 #aebfca}
.kc-v3-key--operator{background:#caece7;border-color:#83c9bf;color:#0c5a50;box-shadow:0 3px 0 #72b5ac}
.kc-v3-key--clear{background:#e75667;border-color:#c83f50;color:#fff;box-shadow:0 3px 0 #a72f3e;font-size:1.1rem}
.kc-v3-key--plus{background:#2a9d8f;border-color:#248a7e;color:#fff;box-shadow:0 3px 0 #1d7168}
.kc-v3-science-tools{gap:7px;margin:4px 0 12px}
.kc-v3-science-tools button{min-height:35px;background:#fff0df;border-color:#efbd85;color:#75420e;box-shadow:0 3px 0 #d99c59;font-size:.79rem}
.kc-angle-switch button{border:1px solid rgba(255,255,255,.28);background:rgba(255,255,255,.08);color:#dcebf3}
.kc-angle-switch .is-active{background:#fff;color:#173f5f}
.kc-rate-panel{border:1px solid rgba(255,255,255,.18);background:rgba(255,255,255,.94)}

/* Clean history card, not a copy of the spiral-notebook UI. */
.kc-history-rings{display:none}
.kc-history-paper{
  min-height:430px;padding:22px;border:1px solid #d4e2e9;border-radius:22px;
  background:
    linear-gradient(to bottom,transparent 39px,rgba(72,120,145,.09) 40px),
    #fff;
  background-size:100% 40px;
  box-shadow:0 24px 54px rgba(16,42,67,.13);
  overflow:hidden;
}
.kc-history-head{
  min-height:72px;padding:0 0 13px;border-bottom:1px solid #dbe6ec;align-items:flex-start;
}
.kc-history-head strong{font-size:1.02rem;letter-spacing:-.01em}
.kc-history-head span{color:#5c7282}
.kc-history-head time{color:#2a7ca7;font-variant-numeric:tabular-nums}
.kc-history-list{max-height:430px}
.kc-history-item{min-height:68px;border-bottom:1px solid rgba(75,119,141,.12)}
.kc-history-item:hover,.kc-history-item:focus{background:rgba(231,243,248,.68);border-radius:9px}
.kc-history-editor{height:430px;color:#263b48;line-height:40px}

/* All four action buttons use exactly the same typography and colour. */
.kc-history-actions{grid-template-columns:repeat(4,minmax(0,1fr));gap:9px;margin-top:14px}
.kc-history-actions button{
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:4px;
  min-height:64px;padding:8px 5px;border:1px solid #cbd9e1;border-radius:12px;
  background:#fff;color:#233d50;font-size:.76rem;font-weight:800;line-height:1.15;
  box-shadow:0 5px 14px rgba(16,42,67,.05);
}
.kc-history-actions button span,
.kc-history-actions button [data-history-edit-label]{
  color:inherit;font:inherit;font-size:inherit;font-weight:inherit;line-height:inherit;
}
.kc-history-actions button > span[aria-hidden="true"]{font-size:1.05rem;line-height:1;color:#2a7ca7}
.kc-history-actions button:hover,.kc-history-actions button.is-active{
  border-color:#79abc2;background:#eef7fa;color:#173f5f;
}
.kc-history-actions [data-history-action="edit"].is-active{border-color:#79abc2;background:#eef7fa;color:#173f5f}

.kc-history-workbench.is-history-hidden{grid-template-columns:max-content}
.kc-history-workbench.is-history-hidden .kc-workbench-main{display:block;width:auto}
.kc-history-workbench.is-history-hidden .calculator-view{width:auto}

@media (min-width:981px){
  .kc-history-paper{height:var(--paired-height,auto);min-height:0}
  .kc-history-list{max-height:calc(var(--paired-height,430px) - 116px)}
  .kc-history-editor{height:calc(var(--paired-height,430px) - 98px)}
}
@media (max-width:980px){
  .kc-history-workbench{grid-template-columns:1fr;justify-content:stretch;gap:28px}
  .kc-history-pad{width:min(100%,560px);margin-inline:auto}
  .kc-history-paper{min-height:310px;height:auto!important}
  .kc-history-list{max-height:310px}
  .kc-history-editor{height:310px}
  .kc-history-workbench.is-history-hidden{grid-template-columns:1fr}
}
@media (max-width:560px){
  .kc-v3-zone .kc-tool-stage{padding:26px 12px}
  .kc-v3-calculator{border-radius:18px;padding:11px}
  .kc-v3-grid{gap:6px}
  .kc-v3-key{border-radius:9px}
  .kc-history-actions{grid-template-columns:repeat(2,minmax(0,1fr))}
  .kc-history-paper{border-radius:17px;padding:18px 15px}
}


/* V4.3.2 — desktop toolbar uses compact icon + text actions; mobile keeps large touch controls. */
.kc-visually-hidden{position:absolute!important;width:1px!important;height:1px!important;padding:0!important;margin:-1px!important;overflow:hidden!important;clip:rect(0,0,0,0)!important;white-space:nowrap!important;border:0!important}
.kc-history-head__copy{min-width:0}
.kc-history-head__tools{display:flex;flex-direction:column;align-items:flex-end;gap:8px;min-width:0}
.kc-history-toolbar{display:flex;align-items:center;justify-content:flex-end;flex-wrap:wrap;gap:4px}
.kc-history-toolbar button{display:inline-flex;align-items:center;justify-content:center;gap:5px;min-height:30px;padding:6px 8px;border:1px solid transparent;border-radius:8px;background:transparent;color:#315267;font:750 .72rem/1 system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;cursor:pointer;white-space:nowrap;transition:border-color .16s ease,background .16s ease,color .16s ease,transform .16s ease}
.kc-history-toolbar button:hover,.kc-history-toolbar button.is-active{border-color:#c8dce7;background:#edf7fa;color:#123f58;transform:translateY(-1px)}
.kc-history-toolbar button:focus-visible{outline:3px solid rgba(42,124,167,.22);outline-offset:2px}
.kc-history-toolbar__icon{display:inline-grid;place-items:center;min-width:14px;color:#2a7ca7;font-size:.92rem;line-height:1}
.kc-history-toolbar__label{font:inherit;color:inherit}
.kc-history-toolbar [data-history-edit-icon]{color:#2a7ca7}
.kc-history-actions--mobile{display:none}
@media (max-width:1180px) and (min-width:981px){
  .kc-history-head{align-items:flex-start}
  .kc-history-head__tools{max-width:220px}
  .kc-history-toolbar{gap:2px}
  .kc-history-toolbar button{padding:5px 6px;font-size:.68rem}
}
@media (max-width:980px){
  .kc-history-toolbar{display:none}
  .kc-history-actions--mobile{display:grid}
}

/* V4.3.3 — wider desktop workspace so the history title and all actions stay on one line. */
@media (min-width:981px){
  .kc-v3-zone .kc-tool-stage{
    padding-inline:clamp(18px,2.7vw,34px);
  }
  .kc-history-workbench{
    --history-width:500px;
    grid-template-columns:max-content var(--history-width);
    gap:clamp(22px,2.5vw,30px);
  }
  .kc-v3-calculator.is-size-compact{width:min(100%,400px)}
  .kc-v3-calculator--science.is-size-compact{width:min(100%,430px)}
  .kc-v3-calculator.is-size-normal{width:min(100%,460px)}
  .kc-v3-calculator--science.is-size-normal{width:min(100%,490px)}
  .kc-v3-calculator.is-size-large{width:min(100%,520px)}
  .kc-v3-calculator--science.is-size-large{width:min(100%,535px)}

  .kc-history-head{
    display:flex;
    align-items:flex-start;
    justify-content:space-between;
    gap:16px;
  }
  .kc-history-head__copy{flex:0 0 auto}
  .kc-history-head__copy strong{white-space:nowrap}
  .kc-history-head__tools{
    flex:1 1 auto;
    max-width:none;
    align-items:flex-end;
    gap:6px;
  }
  .kc-history-toolbar{
    flex-wrap:nowrap;
    gap:3px;
    width:auto;
  }
  .kc-history-toolbar button{
    flex:0 0 auto;
    padding:6px 7px;
    font-size:.70rem;
  }
  .kc-history-toolbar__icon{min-width:13px;font-size:.88rem}
}

@media (min-width:981px) and (max-width:1120px){
  .kc-history-workbench{--history-width:470px;gap:20px}
  .kc-v3-calculator.is-size-normal{width:min(100%,440px)}
  .kc-v3-calculator--science.is-size-normal{width:min(100%,465px)}
  .kc-v3-calculator.is-size-large{width:min(100%,485px)}
  .kc-v3-calculator--science.is-size-large{width:min(100%,500px)}
  .kc-history-toolbar button{padding:5px 6px;font-size:.67rem}
}

/* V4.3.4 — center the complete homepage hero copy */
.kc-intro__grid{
  display:flex;
  justify-content:center;
  align-items:center;
  grid-template-columns:none;
  gap:0;
}
.kc-intro__copy{
  width:min(100%,900px);
  margin-inline:auto;
  display:flex;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  text-align:center;
}
.kc-intro h1{
  max-width:900px;
  margin-inline:auto;
}
.kc-intro__lead{
  max-width:760px;
  margin:24px auto;
}
.kc-intro__points{
  justify-content:center;
  width:100%;
}
.kc-primary-link{
  align-self:center;
}
@media(max-width:860px){
  .kc-intro__grid{
    display:flex;
    justify-content:center;
    align-items:center;
    padding:56px 0;
  }
  .kc-intro__copy{
    width:100%;
    text-align:center;
    align-items:center;
  }
}
@media(max-width:620px){
  .kc-intro__points{
    justify-items:center;
    width:100%;
  }
  .kc-intro__points span{
    width:max-content;
    max-width:100%;
  }
}