/* uplan.com.ua — design system "зошит у клітинку + фінтех" */
:root{
  --paper:#FBFBF8; --surface:#FFFFFF; --ink:#16181D; --muted:#5B6170; --faint:#8A90A0;
  --line:#E7E9F0; --grid:#E6EAF4;
  --brand:#1E2AD6; --brand-ink:#161FA8; --brand-tint:#EEF0FF;
  --mark:#DDF94A; --mark-deep:#C2E028;
  --radius:16px; --radius-sm:10px;
  --shadow:0 1px 2px rgba(20,24,40,.04), 0 12px 32px -16px rgba(20,24,40,.18);
  --shadow-sm:0 1px 2px rgba(20,24,40,.05), 0 6px 16px -10px rgba(20,24,40,.16);
  --sans:'Inter',system-ui,sans-serif;
  --display:'Unbounded',system-ui,sans-serif;
  --mono:'JetBrains Mono',ui-monospace,monospace;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--sans);color:var(--ink);background:var(--paper);line-height:1.6;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
button{font-family:inherit;cursor:pointer}
img{max-width:100%}
::selection{background:var(--mark);color:var(--ink)}

/* ---------- Header ---------- */
header.site{position:sticky;top:0;z-index:40;background:rgba(251,251,248,.82);backdrop-filter:saturate(150%) blur(10px);-webkit-backdrop-filter:saturate(150%) blur(10px);border-bottom:1px solid var(--line)}
.bar{max-width:1280px;margin:0 auto;display:flex;align-items:center;gap:24px;padding:14px 24px}
.brand{display:flex;align-items:center;gap:10px;font-family:var(--display);font-weight:700;font-size:19px;letter-spacing:-.02em}
.brand .glyph{width:30px;height:30px;border-radius:8px;background:var(--brand);display:grid;place-items:center;color:#fff;font-family:var(--mono);font-weight:700;font-size:16px;box-shadow:inset 0 0 0 1px rgba(255,255,255,.12)}
.brand small{font-family:var(--sans);font-weight:500;font-size:11px;color:var(--faint);letter-spacing:.04em;text-transform:uppercase;margin-left:2px}
nav.top{display:flex;gap:4px;margin-left:8px}
nav.top a{font-size:14px;font-weight:500;color:var(--muted);padding:8px 12px;border-radius:8px;transition:.16s}
nav.top a:hover{color:var(--ink);background:var(--brand-tint)}
nav.top a.is-active{color:var(--brand);background:var(--brand-tint)}
.bar .spacer{flex:1}
.ghost-btn{border:1px solid var(--line);background:var(--surface);color:var(--ink);font-size:14px;font-weight:500;padding:8px 14px;border-radius:9px;transition:.16s;display:inline-block}
.ghost-btn:hover{border-color:var(--brand);color:var(--brand)}
.burger{display:none;width:42px;height:42px;border-radius:10px;border:1px solid var(--line);background:var(--surface);align-items:center;justify-content:center}
.burger svg{width:20px;height:20px;stroke:var(--ink)}

/* ---------- Shell ---------- */
.shell{max-width:1280px;margin:0 auto;display:grid;grid-template-columns:268px 1fr;gap:36px;padding:28px 24px 64px}

/* ---------- Sidebar ---------- */
aside.catalog{position:sticky;top:84px;align-self:start;max-height:calc(100vh - 104px);overflow:auto;padding-right:4px}
.cat-head{font-size:12px;font-weight:600;letter-spacing:.08em;text-transform:uppercase;color:var(--faint);padding:4px 8px 12px}
.cat-all{display:flex;align-items:center;gap:10px;font-size:14px;font-weight:600;color:var(--brand);background:var(--brand-tint);padding:11px 12px;border-radius:10px;margin-bottom:14px}
.cat-all svg{width:16px;height:16px;stroke:var(--brand);fill:none;stroke-width:2}
.acc{border-bottom:1px solid var(--line)}
.acc:first-of-type{border-top:1px solid var(--line)}
.acc>button{width:100%;display:flex;align-items:center;gap:10px;background:none;border:0;padding:13px 8px;font-size:14px;font-weight:600;color:var(--ink);text-align:left}
.acc>button .chev{margin-left:auto;width:16px;height:16px;stroke:var(--faint);transition:transform .2s}
.acc[aria-expanded="true"]>button .chev{transform:rotate(90deg)}
.acc .dot{width:7px;height:7px;border-radius:2px;background:var(--brand);opacity:.55;flex:none}
.acc-body{display:grid;grid-template-rows:0fr;transition:grid-template-rows .24s ease}
.acc[aria-expanded="true"] .acc-body{grid-template-rows:1fr}
.acc-body>div{overflow:hidden}
.acc-body ul{list-style:none;padding:0 0 10px}
.acc-body a{display:block;font-size:13.5px;color:var(--muted);padding:7px 8px 7px 25px;border-radius:8px;position:relative;transition:.14s}
.acc-body a:hover{color:var(--ink);background:var(--brand-tint)}
.acc-body a.is-active{color:var(--brand);font-weight:600;background:var(--brand-tint)}
.acc-body a.is-active::before{content:"";position:absolute;left:10px;top:50%;transform:translateY(-50%);width:6px;height:6px;border-radius:50%;background:var(--brand)}

/* ---------- Main / hero ---------- */
main{min-width:0}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-family:var(--mono);font-size:12px;font-weight:500;color:var(--brand);background:var(--brand-tint);padding:5px 11px;border-radius:99px;letter-spacing:.02em}
h1{font-family:var(--display);font-weight:700;font-size:clamp(28px,4.4vw,44px);line-height:1.05;letter-spacing:-.03em;margin:16px 0 12px}
.lede{font-size:17px;color:var(--muted);max-width:60ch;margin-bottom:26px}

/* ---------- Graph-paper calculator ---------- */
.grid-stage{background:var(--surface);background-image:linear-gradient(var(--grid) 1px,transparent 1px),linear-gradient(90deg,var(--grid) 1px,transparent 1px);background-size:26px 26px;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:10px;margin-bottom:8px}
.calc{background:var(--surface);border-radius:12px;padding:24px}
@media(min-width:560px){.calc{padding:30px}}
.tabs{display:flex;gap:4px;background:#F4F5F9;padding:4px;border-radius:12px;margin-bottom:26px;flex-wrap:wrap}
.tabs button{flex:1;min-width:120px;border:0;background:transparent;color:var(--muted);font-size:13.5px;font-weight:600;padding:10px 10px;border-radius:9px;transition:.16s;white-space:nowrap}
.tabs button[aria-selected="true"]{background:var(--surface);color:var(--brand);box-shadow:var(--shadow-sm)}
.panel{display:none}
.panel.is-active{display:block;animation:rise .28s ease}
@keyframes rise{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
.formula-row{display:flex;align-items:flex-end;flex-wrap:wrap;gap:14px 18px;font-size:16px;color:var(--ink)}
.field{display:flex;flex-direction:column;gap:7px}
.field label{font-size:12.5px;font-weight:600;color:var(--muted)}
.field .wrap{position:relative;display:flex;align-items:center}
.field input{font-family:var(--mono);font-weight:500;font-size:18px;color:var(--ink);width:150px;padding:13px 14px;border:1.5px solid var(--line);border-radius:11px;background:var(--paper);transition:.16s;text-align:left;-moz-appearance:textfield}
.field input::-webkit-outer-spin-button,.field input::-webkit-inner-spin-button{-webkit-appearance:none;margin:0}
.field input:focus{outline:none;border-color:var(--brand);background:#fff;box-shadow:0 0 0 4px var(--brand-tint)}
.field.suffix .wrap::after{content:attr(data-suffix);position:absolute;right:14px;font-family:var(--mono);color:var(--faint);font-weight:600;pointer-events:none}
.field.suffix input{padding-right:38px}
.glue{font-size:15px;color:var(--muted);padding-bottom:14px;white-space:nowrap}
.actions{display:flex;align-items:center;gap:14px;margin-top:24px;flex-wrap:wrap}
.calc-btn{background:var(--brand);color:#fff;border:0;font-size:15px;font-weight:600;padding:14px 26px;border-radius:12px;transition:.16s;box-shadow:0 8px 18px -8px rgba(30,42,214,.6)}
.calc-btn:hover{background:var(--brand-ink);transform:translateY(-1px)}
.calc-btn:active{transform:translateY(0)}
.result{margin-top:26px;display:none}
.result.show{display:block}
.result .cap{font-size:12.5px;font-weight:600;color:var(--muted);margin-bottom:8px}
.answer-line{display:flex;align-items:baseline;gap:14px;flex-wrap:wrap}
.answer{position:relative;display:inline-block;font-family:var(--display);font-weight:700;font-size:clamp(32px,6.5vw,50px);line-height:1;letter-spacing:-.02em;color:var(--ink);padding:2px 6px;z-index:0}
.answer .unit{font-size:.5em;font-weight:500;color:var(--muted);margin-left:4px}
.answer::before{content:"";position:absolute;left:0;right:0;bottom:4px;top:38%;background:var(--mark);z-index:-1;border-radius:3px;transform-origin:left center;transform:scaleX(0);transition:transform .42s cubic-bezier(.2,.8,.2,1)}
.result.show .answer::before{transform:scaleX(1)}
.copy{display:inline-flex;align-items:center;gap:7px;border:1px solid var(--line);background:var(--surface);color:var(--muted);font-size:13px;font-weight:600;padding:8px 13px;border-radius:9px;transition:.16s}
.copy:hover{border-color:var(--brand);color:var(--brand)}
.copy svg{width:15px;height:15px}
.restate{font-size:14px;color:var(--muted);margin-top:14px}
.restate b{color:var(--ink);font-weight:600}

/* ---------- Article ---------- */
article{margin-top:46px;max-width:72ch}
article.lead-only{margin-top:8px}
article h2{font-family:var(--display);font-weight:500;font-size:25px;letter-spacing:-.02em;margin:36px 0 14px}
article h3{font-size:17px;font-weight:600;margin:24px 0 8px}
article p{color:#2B2F3A;margin-bottom:14px}
article ul,article ol{margin:0 0 16px;padding-left:22px;color:#2B2F3A}
article li{margin-bottom:7px}
article li::marker{color:var(--brand)}
article strong{font-weight:600;color:var(--ink)}
article a{color:var(--brand);font-weight:500;border-bottom:1px solid var(--brand-tint);transition:.14s}
article a:hover{border-bottom-color:var(--brand)}
article table{width:100%;border-collapse:collapse;margin:18px 0;font-size:14.5px}
article table a{display:block;padding:12px 14px;border:1px solid var(--line);border-radius:10px;background:var(--surface);font-weight:600;border-bottom:1px solid var(--line)}
article table a:hover{border-color:var(--brand);color:var(--brand)}
article td{padding:5px;vertical-align:top}
article td:empty{display:none}
/* form-style calculators (vacation, fuel) */
.calc-fields{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:16px 18px}
.calc-fields .field input{width:100%}

/* number-base converter result */
.conv-rows{display:flex;flex-direction:column;gap:8px;margin-top:6px}
.conv-row{display:flex;align-items:center;gap:12px;padding:12px 14px;border:1px solid var(--line);border-radius:11px;background:var(--paper);transition:.16s}
.conv-row.is-source{border-color:var(--mark-deep);background:#FCFEEC}
.conv-label{font-size:13px;font-weight:600;color:var(--muted);width:170px;flex:none}
.conv-row.is-source .conv-label{color:var(--brand-ink)}
.conv-val{font-family:var(--mono);font-weight:700;font-size:17px;color:var(--ink);flex:1;word-break:break-all;line-height:1.3}
.conv-copy{flex:none;width:34px;height:34px;border:1px solid var(--line);background:var(--surface);border-radius:9px;color:var(--muted);display:grid;place-items:center;transition:.16s}
.conv-copy:hover{border-color:var(--brand);color:var(--brand)}
.conv-copy svg{width:15px;height:15px}
@media(max-width:560px){.conv-label{width:auto}.conv-row{flex-wrap:wrap}}

.callout{background:var(--surface);background-image:linear-gradient(var(--grid) 1px,transparent 1px),linear-gradient(90deg,var(--grid) 1px,transparent 1px);background-size:26px 26px;border:1px solid var(--line);border-radius:12px;padding:22px 24px;margin:18px 0;font-family:var(--mono);font-size:17px;font-weight:500;color:var(--ink);box-shadow:var(--shadow-sm)}
.callout span{background:var(--mark);padding:1px 5px;border-radius:3px}

/* ---------- Link grid (hub pages) ---------- */
.linkgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:14px;margin:8px 0 10px}
.linkcard{display:flex;align-items:flex-start;gap:14px;background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:18px;transition:.18s}
.linkcard:hover{border-color:var(--brand);transform:translateY(-2px);box-shadow:var(--shadow-sm)}
.linkcard .ic{flex:none;width:42px;height:42px;border-radius:11px;background:var(--brand-tint);display:grid;place-items:center}
.linkcard .ic svg{width:21px;height:21px;stroke:var(--brand);fill:none;stroke-width:1.7}
.linkcard>span:last-child{display:flex;flex-direction:column;min-width:0}
.linkcard .t{display:block;font-size:14.5px;font-weight:600;margin-bottom:3px;color:var(--ink);line-height:1.25}
.linkcard .d{display:block;font-size:12.5px;color:var(--muted);line-height:1.45}

/* ---------- Related ---------- */
.related{margin-top:54px}
.related h2{font-family:var(--display);font-weight:500;font-size:24px;letter-spacing:-.02em;margin-bottom:6px}
.related p.sub{color:var(--muted);margin-bottom:22px;font-size:15px}

/* ---------- Footer ---------- */
footer.site{border-top:1px solid var(--line);background:var(--surface);margin-top:20px}
.foot{max-width:1280px;margin:0 auto;padding:48px 24px 40px;display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:32px}
.foot .brand{margin-bottom:14px}
.foot p.about{font-size:13.5px;color:var(--muted);max-width:34ch}
.foot h4{font-size:12px;font-weight:600;letter-spacing:.07em;text-transform:uppercase;color:var(--faint);margin-bottom:14px}
.foot ul{list-style:none}
.foot li{margin-bottom:9px}
.foot a{font-size:13.5px;color:var(--muted);transition:.14s}
.foot a:hover{color:var(--brand)}
.copyright{border-top:1px solid var(--line);padding:18px 24px;font-size:13px;color:var(--faint);max-width:1280px;margin:0 auto;display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px}

/* ---------- Drawer / mobile ---------- */
.scrim{position:fixed;inset:0;background:rgba(20,24,40,.4);opacity:0;pointer-events:none;transition:.2s;z-index:45}
.scrim.show{opacity:1;pointer-events:auto}
@media(max-width:1024px){
  nav.top{display:none}
  .burger{display:flex}
  .ghost-btn.cta{display:none}
  .shell{grid-template-columns:1fr;gap:0;padding-top:20px}
  aside.catalog{position:fixed;top:0;left:0;bottom:0;width:300px;max-height:none;z-index:46;background:var(--surface);border-right:1px solid var(--line);padding:18px 16px;transform:translateX(-105%);transition:transform .26s ease;box-shadow:0 0 60px -10px rgba(20,24,40,.3)}
  aside.catalog.open{transform:none}
  .drawer-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:8px}
  .drawer-close{width:38px;height:38px;border:1px solid var(--line);border-radius:9px;background:var(--surface);display:grid;place-items:center}
  .drawer-close svg{width:18px;height:18px;stroke:var(--ink)}
}
@media(min-width:1025px){.drawer-head{display:none}}
@media(max-width:560px){
  .bar{padding:12px 16px;gap:12px}
  .shell{padding:18px 16px 48px}
  .foot{grid-template-columns:1fr 1fr;gap:26px}
  .field input{width:100%}
  .field{flex:1;min-width:140px}
  .formula-row{gap:12px}
  .tabs{flex-direction:column}
  .tabs button{min-width:0;width:100%;text-align:left;padding:11px 14px}
}
@media(prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important;scroll-behavior:auto!important}
  .result.show .answer::before{transform:scaleX(1)}
}
:focus-visible{outline:2.5px solid var(--brand);outline-offset:2px;border-radius:6px}