/* Vysvetlený: mobile-first, system fonts, no external requests */
:root {
  --ink: #1b2425;
  --ink-2: #4a5657;
  --muted: #6b7778;
  --paper: #fbfaf6;
  --card: #ffffff;
  --line: #e3e0d6;
  --brand: #0f3d3e;
  --brand-2: #16595a;
  --accent: #f2b705;
  --link: #0b5c5e;
  --tip: #e8f4ef;
  --tip-b: #2f8a63;
  --warn: #fff4e0;
  --warn-b: #c77700;
  --ex: #eef3fb;
  --ex-b: #3b6db3;
  --ins: #fbf3d9;
  --ins-b: #b38600;
  --radius: 12px;
  --serif: "Iowan Old Style", "Charter", "Palatino Linotype", "Book Antiqua", Georgia, serif;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: 1rem; }
body { margin: 0; font-family: var(--sans); font-size: 1.0625rem; line-height: 1.7; color: var(--ink); background: var(--paper); }
img, svg { max-width: 100%; height: auto; }
a { color: var(--link); text-decoration-thickness: 1px; text-underline-offset: .18em; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; border-radius: 4px; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }
.skip { position: absolute; left: -999px; top: .5rem; background: var(--brand); color: #fff; padding: .5rem 1rem; z-index: 10; border-radius: 6px; }
.skip:focus { left: .5rem; }
.wrap { max-width: 72rem; margin: 0 auto; padding: 0 1rem; }
.narrow-wrap { max-width: 46rem; }
.narrow { max-width: 42rem; }
.small { font-size: .875rem; }
h1, h2, h3 { font-family: var(--serif); line-height: 1.25; color: var(--brand); letter-spacing: -.005em; }
h1 { font-size: clamp(1.8rem, 5.5vw, 2.6rem); margin: .4rem 0 .6rem; }
h2 { font-size: clamp(1.35rem, 3.6vw, 1.7rem); margin: 2.2rem 0 .7rem; }
h3 { font-size: 1.2rem; margin: 1.6rem 0 .5rem; }

/* header */
.site-header { background: var(--brand); color: #fff; position: relative; }
.header-inner { display: flex; align-items: center; gap: .75rem; min-height: 3.6rem; }
.logo { display: inline-flex; align-items: center; gap: .5rem; color: #fff; text-decoration: none; font-family: var(--serif); font-size: 1.3rem; font-weight: 700; }
.logo-mark { display: inline-grid; place-items: center; width: 2rem; height: 2rem; border-radius: 8px; background: #fff; color: var(--brand); font-family: var(--sans); font-weight: 800; font-size: 1.05rem; box-shadow: inset 0 -3px 0 var(--accent); }
.header-search { flex: 1; display: none; }
.header-search input { width: 100%; max-width: 20rem; float: right; }
input[type=search], input[type=number], select { font: inherit; font-size: 1rem; padding: .55rem .75rem; border: 1px solid var(--line); border-radius: 8px; background: #fff; color: var(--ink); min-height: 2.75rem; }
.site-header input[type=search] { border-color: transparent; background: rgba(255,255,255,.12); color: #fff; }
.site-header input[type=search]::placeholder { color: rgba(255,255,255,.75); }
.menu { margin-left: auto; }
.menu summary { list-style: none; cursor: pointer; display: flex; align-items: center; gap: .5rem; padding: .5rem .25rem; min-height: 2.75rem; }
.menu summary::-webkit-details-marker { display: none; }
.burger, .burger::before, .burger::after { display: block; width: 1.3rem; height: 2px; background: #fff; position: relative; }
.burger::before, .burger::after { content: ""; position: absolute; left: 0; }
.burger::before { top: -6px; } .burger::after { top: 6px; }
.menu nav { position: absolute; left: 0; right: 0; top: 100%; background: var(--brand); z-index: 5; padding: .5rem 1rem 1rem; box-shadow: 0 10px 20px rgba(0,0,0,.2); }
.menu ul, .nav-desktop ul { list-style: none; margin: 0; padding: 0; }
.menu li a { display: block; color: #fff; text-decoration: none; padding: .7rem 0; border-bottom: 1px solid rgba(255,255,255,.12); }
.nav-desktop { display: none; }
.menu a.active { font-weight: 700; }

/* breadcrumbs */
.crumbs ol { list-style: none; padding: 0; margin: 1rem 0 0; display: flex; flex-wrap: wrap; gap: .25rem; font-size: .875rem; color: var(--muted); }
.crumbs li + li::before { content: "›"; margin-right: .3rem; color: var(--muted); }
.crumbs a { color: var(--ink-2); }
.crumbs li[aria-current] { font-weight: 400; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; max-width: 60vw; }

/* article */
.article { max-width: 44rem; }
.byline { display: flex; flex-wrap: wrap; gap: .25rem 1rem; color: var(--muted); font-size: .9rem; margin: 0 0 1.25rem; }
.byline span + span::before { content: "·"; margin-right: 1rem; }
.tldr { background: var(--card); border: 1px solid var(--line); border-left: 5px solid var(--accent); border-radius: var(--radius); padding: 1rem 1.2rem; margin: 0 0 1.5rem; }
.tldr p { margin: 0; }
.tldr .tldr-h { font-weight: 700; text-transform: uppercase; font-size: .78rem; letter-spacing: .08em; color: var(--brand); margin-bottom: .3rem; }
.toc { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: .75rem 1.1rem; margin: 0 0 1.5rem; font-size: .95rem; }
.toc summary { font-weight: 700; cursor: pointer; color: var(--brand); }
.toc ol { margin: .5rem 0 .25rem; padding-left: 1.3rem; }
.toc li { margin: .2rem 0; }
.prose p, .prose ul, .prose ol { margin: 0 0 1rem; }
.prose li { margin: .3rem 0; }
.prose strong { color: #111a1b; }
.prose blockquote { margin: 1rem 0; padding: .25rem 1rem; border-left: 4px solid var(--line); color: var(--ink-2); }
.table-wrap { overflow-x: auto; margin: 1rem 0 1.4rem; border: 1px solid var(--line); border-radius: var(--radius); background: var(--card); }
table { border-collapse: collapse; width: 100%; font-size: .93rem; line-height: 1.45; }
th, td { padding: .6rem .75rem; text-align: left; vertical-align: top; border-bottom: 1px solid var(--line); }
thead th { background: #f3f1ea; color: var(--brand); font-weight: 700; white-space: nowrap; }
tbody th { font-weight: 600; }
tbody tr:last-child > * { border-bottom: 0; }
td.num { text-align: right; font-variant-numeric: tabular-nums; white-space: nowrap; }
.callout { border-radius: var(--radius); padding: .9rem 1.1rem .2rem; margin: 1.4rem 0; border: 1px solid; }
.callout-title { font-weight: 700; margin: 0 0 .5rem !important; }
.callout-kind { display: inline-block; font-size: .72rem; letter-spacing: .08em; text-transform: uppercase; padding: .1rem .5rem; border-radius: 99px; margin-right: .4rem; color: #fff; vertical-align: .1em; }
.callout-tip { background: var(--tip); border-color: #cde6da; } .callout-tip .callout-kind { background: var(--tip-b); }
.callout-warning { background: var(--warn); border-color: #f2d9ad; } .callout-warning .callout-kind { background: var(--warn-b); }
.callout-example { background: var(--ex); border-color: #d3dff2; } .callout-example .callout-kind { background: var(--ex-b); }
.callout-insight { background: var(--ins); border-color: #efdea5; } .callout-insight .callout-kind { background: var(--ins-b); }
.callout-info { background: #f1f1ee; border-color: var(--line); } .callout-info .callout-kind { background: var(--brand-2); }
.faq-item { border: 1px solid var(--line); border-radius: var(--radius); background: var(--card); margin: .6rem 0; }
.faq-item summary { cursor: pointer; padding: .8rem 1rem; list-style: none; position: relative; padding-right: 2.5rem; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; position: absolute; right: 1rem; top: .7rem; font-size: 1.3rem; color: var(--brand); }
.faq-item[open] summary::after { content: "−"; }
.faq-item summary h3 { display: inline; font-size: 1.05rem; margin: 0; font-family: var(--sans); color: var(--ink); }
.faq-item > div { padding: 0 1rem .3rem; }
.sources { font-size: .92rem; color: var(--ink-2); }
.sources a.ext { word-break: break-word; }
.trust { margin: 2rem 0 0; padding: 1rem 1.2rem; background: #f3f1ea; border-radius: var(--radius); font-size: .92rem; color: var(--ink-2); }
.trust p { margin: 0; }
.tool-cta { margin: 2rem 0; padding: 1.1rem 1.2rem; background: var(--brand); color: #fff; border-radius: var(--radius); }
.tool-cta p { margin: 0 0 .8rem; }
.tool-cta .btn { background: var(--accent); color: var(--brand); }
.btn { display: inline-block; font: inherit; font-weight: 700; background: var(--brand); color: #fff; border: 0; border-radius: 8px; padding: .65rem 1.1rem; text-decoration: none; cursor: pointer; min-height: 2.75rem; }
.btn:hover { filter: brightness(1.1); }

/* cards and hubs */
.related { max-width: 44rem; margin: 2.5rem 0 1rem; }
.cards { list-style: none; padding: 0; margin: 1rem 0; display: grid; gap: .8rem; }
.card a, .steps a { display: block; height: 100%; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 1rem 1.1rem; text-decoration: none; color: var(--ink); transition: border-color .15s, box-shadow .15s; }
.card a:hover, .steps a:hover { border-color: var(--brand-2); box-shadow: 0 4px 14px rgba(15,61,62,.08); }
.card-title { display: block; font-weight: 700; color: var(--brand); line-height: 1.35; margin-bottom: .3rem; }
.card-desc { display: block; font-size: .92rem; color: var(--ink-2); line-height: 1.5; }
.hub-head { margin: 1rem 0 1.5rem; max-width: 46rem; }
.eyebrow { text-transform: uppercase; letter-spacing: .1em; font-size: .78rem; font-weight: 700; color: var(--brand-2); margin: 0; }
.lead { font-size: 1.15rem; color: var(--ink-2); margin: 0 0 1rem; }
.steps { list-style: none; padding: 0; margin: 0; display: grid; gap: .7rem; }
.steps a { display: flex; gap: .9rem; align-items: flex-start; }
.step-n { flex: none; width: 2rem; height: 2rem; border-radius: 50%; background: var(--brand); color: #fff; display: grid; place-items: center; font-weight: 700; font-size: .9rem; }
.hub-grid { display: grid; gap: 1rem 2.5rem; }
.hub-grid h2 { margin-top: .5rem; font-size: 1.25rem; }
.chips { list-style: none; padding: 0; display: flex; flex-wrap: wrap; gap: .5rem; }
.chips a { display: inline-block; padding: .45rem .9rem; border-radius: 99px; background: var(--card); border: 1px solid var(--line); text-decoration: none; font-weight: 600; }
.hub-tools { margin-bottom: 2rem; }

/* home */
.hero { background: linear-gradient(180deg, var(--brand) 0%, #145052 100%); color: #fff; padding: 2.5rem 0 2.75rem; }
.hero h1 { color: #fff; max-width: 40rem; font-size: clamp(2rem, 6.5vw, 3.1rem); }
.hero .lead { color: rgba(255,255,255,.88); max-width: 38rem; }
.hero .eyebrow { color: var(--accent); }
.hero-search { display: flex; gap: .5rem; max-width: 38rem; margin-top: 1.4rem; }
.hero-search input { flex: 1; min-width: 0; }
.hero .btn { background: var(--accent); color: var(--brand); }
.home-sec { margin: 2.5rem 0; }
.home-sec > h2 { margin-top: 0; }
.sec-lead { color: var(--ink-2); margin-top: -.3rem; }
.topics { display: grid; gap: 1rem; }
.topic { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.1rem 1.2rem; }
.topic h3 { margin: 0 0 .3rem; font-size: 1.3rem; }
.topic h3 a { text-decoration: none; color: var(--brand); }
.topic p { color: var(--ink-2); margin: 0 0 .6rem; font-size: .95rem; }
.topic ul { margin: 0 0 .7rem; padding-left: 1.1rem; font-size: .95rem; }
.topic li { margin: .25rem 0; }
.more { font-weight: 700; text-decoration: none; }
.tools-band { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.3rem; }
.tool-list { list-style: none; padding: 0; margin: 0; display: grid; gap: .5rem; }
.tool-list a { display: block; padding: .7rem .9rem; border-radius: 8px; background: var(--paper); text-decoration: none; border: 1px solid var(--line); }
.tool-list .card-title { margin: 0; }

/* tools */
.tool { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.1rem; margin: 0 0 1.5rem; box-shadow: 0 2px 10px rgba(15,61,62,.05); }
.tool-form { display: grid; gap: .8rem; }
.field label { display: block; font-weight: 600; font-size: .92rem; margin-bottom: .25rem; }
.field small { display: block; color: var(--muted); font-size: .8rem; margin-top: .2rem; }
.field select { width: 100%; }
.input-suffix { display: flex; align-items: stretch; }
.input-suffix input { flex: 1; min-width: 0; border-radius: 8px 0 0 8px; }
.input-suffix span { display: grid; place-items: center; padding: 0 .7rem; border: 1px solid var(--line); border-left: 0; border-radius: 0 8px 8px 0; background: #f3f1ea; color: var(--ink-2); min-width: 2.6rem; font-size: .9rem; }
.tool-out { margin-top: 1.2rem; }
.kpis { display: grid; grid-template-columns: repeat(auto-fit, minmax(9.5rem, 1fr)); gap: .6rem; margin: 0 0 1rem; }
.kpi { background: var(--paper); border: 1px solid var(--line); border-radius: 10px; padding: .7rem .8rem; }
.kpi-l { display: block; font-size: .8rem; color: var(--ink-2); line-height: 1.3; }
.kpi-v { display: block; font-size: 1.3rem; font-weight: 800; color: var(--brand); font-variant-numeric: tabular-nums; line-height: 1.3; }
.kpi.hl { background: var(--brand); border-color: var(--brand); }
.kpi.hl .kpi-l { color: rgba(255,255,255,.85); } .kpi.hl .kpi-v { color: #fff; }
.explain { font-size: .95rem; color: var(--ink-2); }
.bar { display: flex; height: 14px; border-radius: 99px; overflow: hidden; margin: .4rem 0 .3rem; background: var(--line); }
.bar span { display: block; height: 100%; }
.legend { display: flex; flex-wrap: wrap; gap: .3rem 1rem; font-size: .82rem; color: var(--ink-2); margin: 0 0 1rem; }
.legend i { display: inline-block; width: .7rem; height: .7rem; border-radius: 3px; margin-right: .3rem; vertical-align: -.05em; }
.tool-out details { margin-top: .5rem; }
.tool-out details summary { cursor: pointer; font-weight: 700; color: var(--brand); padding: .4rem 0; }

/* glossary */
.glossary-tools { margin: 1rem 0; }
.glossary-tools label { display: block; font-weight: 600; margin-bottom: .3rem; }
.glossary-tools input { width: 100%; }
.az ul { list-style: none; padding: 0; margin: 0 0 1rem; display: flex; flex-wrap: wrap; gap: .3rem; }
.az a { display: grid; place-items: center; min-width: 2.4rem; height: 2.4rem; border: 1px solid var(--line); border-radius: 8px; background: var(--card); text-decoration: none; font-weight: 700; }
.letter { border-bottom: 2px solid var(--accent); padding-bottom: .2rem; }
.term { padding: .8rem 0; border-bottom: 1px solid var(--line); }
.term h3 { margin: 0 0 .3rem; font-size: 1.12rem; }
.term p { margin: 0 0 .5rem; }
.term:target { background: var(--ins); margin: 0 -.75rem; padding: .8rem .75rem; border-radius: 8px; }
.term[hidden], .letter[hidden] { display: none; }

/* search */
.results { list-style: none; padding: 0; }
.results li { padding: .9rem 0; border-bottom: 1px solid var(--line); }
.results .r-c { font-size: .78rem; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); }
.results a { font-weight: 700; font-size: 1.08rem; }
.results p { margin: .2rem 0 0; color: var(--ink-2); font-size: .95rem; }

/* footer */
.site-footer { margin-top: 3rem; background: #0c2f30; color: rgba(255,255,255,.85); font-size: .93rem; padding: 2rem 0 1rem; }
.site-footer a { color: #fff; }
.footer-grid { display: grid; gap: 1.5rem; }
.footer-grid ul { list-style: none; padding: 0; margin: 0; }
.footer-grid li { margin: .35rem 0; }
.footer-brand { font-family: var(--serif); font-size: 1.25rem; font-weight: 700; color: #fff; display: flex; align-items: center; gap: .5rem; margin: 0 0 .5rem; }
.footer-h { font-weight: 700; color: #fff; margin: 0 0 .4rem; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.12); margin-top: 1.5rem; padding-top: 1rem; font-size: .85rem; }

@media (min-width: 40rem) {
  .cards-2, .cards-3 { grid-template-columns: repeat(2, 1fr); }
  .topics { grid-template-columns: repeat(2, 1fr); }
  .tool-form { grid-template-columns: repeat(2, 1fr); }
  .tool-list { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 2fr 1fr 1fr 1fr; }
  .tool { padding: 1.4rem; }
}
@media (min-width: 64rem) {
  body { font-size: 1.1rem; }
  .header-search { display: block; }
  .menu { display: none; }
  .nav-desktop { display: block; border-top: 1px solid rgba(255,255,255,.12); }
  .nav-desktop ul { display: flex; gap: 1.6rem; }
  .nav-desktop a { display: block; color: rgba(255,255,255,.9); text-decoration: none; padding: .6rem 0; font-size: .95rem; border-bottom: 3px solid transparent; }
  .nav-desktop a:hover, .nav-desktop a.active { color: #fff; border-bottom-color: var(--accent); }
  .cards-3 { grid-template-columns: repeat(3, 1fr); }
  .topics { grid-template-columns: repeat(3, 1fr); }
  .tool-list { grid-template-columns: repeat(3, 1fr); }
  .hub-grid { grid-template-columns: 1.3fr 1fr; align-items: start; }
  .article-layout { display: grid; grid-template-columns: minmax(0, 44rem) minmax(0, 1fr); column-gap: 3rem; }
  .article-layout .crumbs { grid-column: 1 / -1; }
  .article-layout .related { grid-column: 2; grid-row: 2; margin-top: 1rem; position: sticky; top: 1rem; align-self: start; }
  .article-layout .related .cards { grid-template-columns: 1fr; }
  .article-layout .related h2 { font-size: 1.1rem; margin-top: 1.5rem; }
  .hero { padding: 3.5rem 0 3.75rem; }
}
@media (prefers-reduced-motion: reduce) { * { transition: none !important; scroll-behavior: auto !important; } }
@media print { .site-header, .site-footer, .tool-cta, .related, .toc, .hero-search { display: none; } body { background: #fff; } }