/* Считайка: бумага, чернила, терракотовый акцент. Результат оформлен как кассовая лента. */
@font-face{font-family:"Golos Text";src:url(/assets/fonts/golos-cyr.woff2) format("woff2");font-weight:400 700;font-display:swap;unicode-range:U+0301,U+0400-045F,U+0490-0491,U+04B0-04B1,U+2116}
@font-face{font-family:"Golos Text";src:url(/assets/fonts/golos-lat.woff2) format("woff2");font-weight:400 700;font-display:swap;unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:"Literata";src:url(/assets/fonts/lit-cyr.woff2) format("woff2");font-weight:500 700;font-display:swap;unicode-range:U+0301,U+0400-045F,U+0490-0491,U+04B0-04B1,U+2116}
@font-face{font-family:"Literata";src:url(/assets/fonts/lit-lat.woff2) format("woff2");font-weight:500 700;font-display:swap;unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}

:root{
  --paper:oklch(.962 .014 85);--card:oklch(.985 .008 85);--ink:oklch(.24 .02 55);--mut:oklch(.46 .02 65);
  --line:oklch(.86 .018 80);--line-strong:oklch(.74 .025 75);
  --ac:oklch(.5 .13 38);--ac-ink:oklch(.985 .008 85);--ac-soft:oklch(.92 .05 55);--ring:oklch(.5 .13 38/.28);
  --sh-1:0 1px 2px oklch(.3 .03 60/.07),0 1px 1px oklch(.3 .03 60/.04);
  --sh-2:0 1px 2px oklch(.3 .03 60/.06),0 8px 24px -10px oklch(.35 .06 50/.25);
  --r-s:6px;--r-m:12px;--r-l:18px;
  --ease:cubic-bezier(.16,1,.3,1);
  --serif:"Literata",Georgia,"Times New Roman",serif;--sans:"Golos Text",system-ui,"Segoe UI",Roboto,sans-serif;
}
@media(prefers-color-scheme:dark){:root{
  --paper:oklch(.2 .012 60);--card:oklch(.245 .014 60);--ink:oklch(.93 .012 80);--mut:oklch(.72 .02 75);
  --line:oklch(.33 .015 60);--line-strong:oklch(.44 .02 60);
  --ac:oklch(.76 .12 50);--ac-ink:oklch(.2 .02 55);--ac-soft:oklch(.32 .05 45);--ring:oklch(.76 .12 50/.35);
  --sh-1:0 1px 2px oklch(0 0 0/.3);--sh-2:0 1px 2px oklch(0 0 0/.3),0 10px 28px -12px oklch(0 0 0/.6);
}}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--paper);color:var(--ink);font:400 1rem/1.65 var(--sans);font-optical-sizing:auto}
.wrap{max-width:1040px;margin:0 auto;padding:0 20px}
a{color:var(--ac);text-underline-offset:.2em;text-decoration-thickness:1px}
a:hover{text-decoration-thickness:2px}
:focus-visible{outline:none;box-shadow:0 0 0 3px var(--ring);border-radius:var(--r-s)}

.top{border-bottom:1px solid var(--line)}
.top .wrap{display:flex;justify-content:space-between;align-items:center;height:64px}
.logo{display:inline-flex;align-items:center;gap:10px;font:600 1.35rem/1 var(--serif);letter-spacing:-.02em;color:var(--ink);text-decoration:none}
.logo::before{content:"=";display:grid;place-items:center;width:28px;height:28px;border-radius:var(--r-s);background:var(--ac);color:var(--ac-ink);font:600 1.1rem/1 var(--sans)}
.tag{color:var(--mut);font-size:.875rem}
@media(max-width:560px){.tag{display:none}}

h1,h2{font-family:var(--serif);font-weight:600;letter-spacing:-.02em;text-wrap:balance}
h1{font-size:clamp(1.9rem,4.6vw,2.9rem);line-height:1.12;margin:12px 0 12px;max-width:20ch}
h2{font-size:1.45rem;line-height:1.25;margin:48px 0 12px}
.crumbs{color:var(--mut);font-size:.875rem;margin-top:28px}.crumbs a{color:var(--mut)}
.lead{color:var(--mut);font-size:1.125rem;max-width:58ch;margin:0 0 32px}

/* калькулятор: форма слева, лента справа */
.calc{display:grid;gap:24px;margin:0 0 16px;align-items:start}
@media(min-width:860px){.calc{grid-template-columns:minmax(0,1.05fr) minmax(0,.95fr);gap:40px}.result{position:sticky;top:20px}}
form{display:grid;gap:16px;background:var(--card);border:1px solid var(--line);border-radius:var(--r-l);padding:24px;box-shadow:var(--sh-1)}
label{display:grid;gap:6px;font-size:.8125rem;font-weight:500}
label span{color:var(--mut)}
input,select{font:inherit;font-size:1rem;padding:12px 14px;border:1px solid var(--line-strong);border-radius:var(--r-s);background:var(--paper);color:var(--ink);width:100%;min-height:46px;transition:border-color .12s,box-shadow .12s}
input:hover,select:hover{border-color:var(--mut)}
input:focus,select:focus{outline:none;border-color:var(--ac);box-shadow:0 0 0 3px var(--ring)}
input[type=number]{font-variant-numeric:tabular-nums}
button{font:inherit;font-weight:600;min-height:48px;padding:12px 20px;border:0;border-radius:var(--r-s);background:var(--ac);color:var(--ac-ink);cursor:pointer;transition:transform .12s var(--ease),filter .12s}
button:hover{filter:brightness(1.08)}button:active{transform:translateY(1px)}

/* лента с результатом */
.tape{margin:0;padding:22px 22px 30px;background:var(--card);border:1px solid var(--line);border-bottom:0;border-radius:var(--r-m) var(--r-m) 0 0;box-shadow:var(--sh-2);
  -webkit-mask:conic-gradient(from -45deg at bottom,#0000,#000 1deg 89deg,#0000 90deg) 50%/14px 100%;mask:conic-gradient(from -45deg at bottom,#0000,#000 1deg 89deg,#0000 90deg) 50%/14px 100%}
.tape .r{display:flex;align-items:baseline;gap:8px;padding:5px 0}
.tape dt{color:var(--mut);font-size:.9375rem;flex:0 1 auto}
.tape .r::after{content:"";order:1;flex:1 1 12px;border-bottom:2px dotted var(--line-strong);min-width:12px;transform:translateY(-3px)}
.tape dd{order:2;margin:0;font-variant-numeric:tabular-nums;font-weight:500;white-space:nowrap}
.tape .main{display:block;padding:0 0 16px;margin-bottom:10px;border-bottom:2px solid var(--ink)}
.tape .main::after{display:none}
.tape .main dt{color:var(--ac);font-size:.8125rem;font-weight:600;letter-spacing:.04em;text-transform:uppercase}
.tape .main dd{font:600 clamp(2rem,5vw,2.75rem)/1.1 var(--serif);letter-spacing:-.02em;margin-top:4px;white-space:normal;overflow-wrap:anywhere}
.notes{color:var(--mut);font-size:.875rem;margin:14px 0 0;padding-left:18px}
.notes li{margin:4px 0}

.text{max-width:68ch}
.text p{margin:0 0 1em}
.example{max-width:440px;margin:16px 0}
.example .tape{box-shadow:var(--sh-1)}
details{border-bottom:1px solid var(--line);padding:14px 0}
details:first-of-type{border-top:1px solid var(--line)}
summary{cursor:pointer;font-weight:600;list-style:none;display:flex;justify-content:space-between;gap:16px}
summary::-webkit-details-marker{display:none}
summary::after{content:"+";color:var(--ac);font:500 1.4rem/1 var(--sans);transition:transform .24s var(--ease)}
details[open] summary::after{transform:rotate(45deg)}
details p{margin:10px 0 0;color:var(--mut);max-width:60ch}

.related ul{list-style:none;margin:0;padding:0;display:grid;gap:8px;grid-template-columns:repeat(auto-fill,minmax(250px,1fr))}
.related li a{display:block;padding:12px 14px;border:1px solid var(--line);border-radius:var(--r-s);background:var(--card);color:var(--ink);text-decoration:none;transition:border-color .12s,transform .24s var(--ease)}
.related li a:hover{border-color:var(--ac);transform:translateY(-1px)}

/* главная */
.hero{padding:48px 0 8px}
.search{max-width:440px;margin:24px 0 0;font-size:.875rem}
.search input{background:var(--card)}
.popular{margin:32px 0 0}
.popular h2{font-size:1.2rem;margin:0 0 12px}
.none{margin:24px 0;color:var(--mut)}
[hidden]{display:none!important}
.cats{display:grid;gap:16px;margin:24px 0 0;counter-reset:cat}
@media(min-width:720px){.cats{grid-template-columns:1fr 1fr}}
.cat{counter-increment:cat;background:var(--card);border:1px solid var(--line);border-radius:var(--r-l);padding:8px 22px 18px;box-shadow:var(--sh-1)}
.cat h2{font-size:1.2rem;margin:14px 0 8px;display:flex;align-items:baseline;gap:10px}
.cat h2::before{content:counter(cat,decimal-leading-zero);color:var(--ac);font:500 .8125rem var(--sans);font-variant-numeric:tabular-nums}
.cat ul{list-style:none;margin:0;padding:0}
.cat li{border-top:1px solid var(--line)}
.cat li a{display:block;padding:9px 0;color:var(--ink);text-decoration:none}
.cat li a:hover{color:var(--ac)}

.foot{margin-top:72px;padding:28px 0 40px;border-top:1px solid var(--line);color:var(--mut);font-size:.8125rem}
.foot p{max-width:70ch;margin:0 0 8px}
.foot-nav{display:flex;flex-wrap:wrap;gap:6px 20px;margin:14px 0}
.foot-nav a{color:var(--ink);text-decoration:none;border-bottom:1px solid var(--line-strong)}
.foot-nav a:hover{color:var(--ac);border-color:var(--ac)}

@media(prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}