:root{
  --blue:#1863DC; --blue-dark:#0F47A1; --gold:#F5BD2D; --ink:#141821; --ink-2:#3B4252;
  --muted:#6B7280; --line:#E3E7EE; --bg:#F7F9FC; --white:#fff;
  --ok:#128A5B; --warn:#B45309; --bad:#C0392B;
  --max:1180px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth; scroll-padding-top:80px}
body{margin:0;font-family:Inter,system-ui,-apple-system,"Segoe UI",Arial,sans-serif;color:var(--ink);background:var(--bg);line-height:1.62;font-size:16px;-webkit-font-smoothing:antialiased}
h1,h2,h3,h4{line-height:1.22;margin:0 0 .5em;font-weight:700;letter-spacing:-.015em}
h1{font-size:clamp(28px,4.4vw,46px);font-weight:800}
h2{font-size:clamp(22px,3vw,32px);margin-top:0}
h3{font-size:clamp(18px,2.2vw,22px);margin-top:1.8em}
h4{font-size:17px;margin-top:1.4em}
p{margin:0 0 1em}
a{color:var(--blue);text-decoration:none}
a:hover{text-decoration:underline}
small{font-size:13px}

/* ---------- layout ---------- */
.wrap{max-width:var(--max);margin:0 auto;padding:0 22px}
header.hero{background:linear-gradient(135deg,#0E2A5C 0%,#1863DC 62%,#2E7BE8 100%);color:#fff;padding:56px 0 46px}
header.hero .wrap{display:grid;gap:26px}
.kicker{display:inline-flex;align-items:center;gap:8px;background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.28);padding:5px 12px;border-radius:999px;font-size:13px;font-weight:600;letter-spacing:.04em;text-transform:uppercase}
header.hero h1{color:#fff;max-width:22ch}
header.hero p.lead{font-size:clamp(16px,2vw,19px);max-width:70ch;color:#DEE9FB;margin:0}
.hero-meta{display:flex;flex-wrap:wrap;gap:10px 26px;font-size:14px;color:#C9DBF8;border-top:1px solid rgba(255,255,255,.22);padding-top:18px}
.hero-meta b{color:#fff;font-weight:600}

nav.toc{position:sticky;top:0;z-index:40;background:rgba(255,255,255,.96);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
nav.toc .wrap{display:flex;gap:4px;overflow-x:auto;padding-top:8px;padding-bottom:8px;scrollbar-width:thin}
nav.toc a{white-space:nowrap;font-size:12.6px;font-weight:600;color:var(--ink-2);padding:7px 8px;border-radius:8px}
nav.toc a:hover{background:#EEF3FD;color:var(--blue);text-decoration:none}

main{padding:8px 0 40px}
section{background:var(--white);border:1px solid var(--line);border-radius:16px;padding:32px 30px;margin:26px 0;box-shadow:0 1px 2px rgba(16,24,40,.04)}
section>h2{display:flex;align-items:baseline;gap:12px;padding-bottom:14px;border-bottom:2px solid var(--gold);margin-bottom:22px}
section>h2 .num{font-size:14px;font-weight:800;color:var(--blue);background:#EEF3FD;padding:4px 10px;border-radius:8px;letter-spacing:.04em}

/* ---------- components ---------- */
.grid{display:grid;gap:16px}
.g2{grid-template-columns:repeat(auto-fit,minmax(280px,1fr))}
.g3{grid-template-columns:repeat(auto-fit,minmax(230px,1fr))}
.g4{grid-template-columns:repeat(auto-fit,minmax(190px,1fr))}

.card{border:1px solid var(--line);border-radius:12px;padding:18px;background:#fff}
.card h4{margin-top:0}
.stat{border:1px solid var(--line);border-radius:12px;padding:16px 18px;background:linear-gradient(180deg,#fff,#F8FAFF)}
.stat .v{font-size:26px;font-weight:800;color:var(--blue);letter-spacing:-.02em;line-height:1.1}
.stat .l{font-size:13px;color:var(--muted);margin-top:4px}

.callout{border-left:4px solid var(--blue);background:#F2F7FF;border-radius:0 12px 12px 0;padding:16px 18px;margin:18px 0}
.callout.warn{border-color:var(--warn);background:#FFF8EC}
.callout.bad{border-color:var(--bad);background:#FEF2F1}
.callout.ok{border-color:var(--ok);background:#F0FAF5}
.callout p:last-child{margin-bottom:0}
.callout .t{font-weight:700;display:block;margin-bottom:4px}

table{width:100%;border-collapse:collapse;font-size:14.5px;margin:14px 0}
th,td{text-align:left;padding:10px 12px;border-bottom:1px solid var(--line);vertical-align:top}
th{background:#F4F7FC;font-weight:700;font-size:13px;text-transform:uppercase;letter-spacing:.03em;color:var(--ink-2)}
tbody tr:hover{background:#FAFCFF}
td.num,th.num{text-align:right;white-space:nowrap;font-variant-numeric:tabular-nums}
.tbl-scroll{overflow-x:auto;-webkit-overflow-scrolling:touch}

.tag{display:inline-block;font-size:11.5px;font-weight:700;padding:2px 8px;border-radius:999px;letter-spacing:.03em;text-transform:uppercase}
.tag.ok{background:#E4F6ED;color:var(--ok)}
.tag.warn{background:#FDF1DC;color:var(--warn)}
.tag.bad{background:#FDECEA;color:var(--bad)}
.tag.neu{background:#EEF1F6;color:var(--ink-2)}
.tag.blue{background:#E7EFFD;color:var(--blue-dark)}

ul.clean{margin:0 0 1em;padding-left:20px}
ul.clean li{margin-bottom:6px}
ol.steps{counter-reset:s;list-style:none;padding:0;margin:16px 0}
ol.steps li{counter-increment:s;position:relative;padding:0 0 14px 42px;margin:0}
ol.steps li::before{content:counter(s);position:absolute;left:0;top:0;width:28px;height:28px;background:var(--blue);color:#fff;border-radius:50%;display:grid;place-items:center;font-weight:700;font-size:14px}

.src{font-size:12.5px;color:var(--muted)}
.src a{color:var(--muted);text-decoration:underline}
mark.todo{background:#FFF1C2;color:#7A5B00;padding:1px 6px;border-radius:5px;font-size:13px;font-weight:600}

/* calculator */
.calc{border:2px solid var(--blue);border-radius:14px;padding:22px;background:linear-gradient(180deg,#FBFDFF,#F2F7FF)}
.calc .row{display:grid;grid-template-columns:1fr auto;gap:10px;align-items:center;margin-bottom:12px}
.calc label{font-size:14px;font-weight:600;color:var(--ink-2)}
.calc input[type=range]{width:100%}
.calc input[type=number]{width:110px;padding:7px 9px;border:1px solid var(--line);border-radius:8px;font-family:inherit;font-size:15px;text-align:right}
.calc select{padding:7px 9px;border:1px solid var(--line);border-radius:8px;font-family:inherit;font-size:15px}
.calc .out{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:12px;margin-top:18px;padding-top:16px;border-top:1px dashed var(--line)}
.calc .out .v{font-size:23px;font-weight:800;color:var(--blue-dark)}
.calc .out .l{font-size:12.5px;color:var(--muted)}

.offer{border:1px solid var(--line);border-left:5px solid var(--gold);border-radius:12px;padding:20px;background:#fff;margin:18px 0}
.offer h4{margin-top:0;font-size:19px}
.stack{list-style:none;padding:0;margin:12px 0}
.stack li{display:flex;justify-content:space-between;gap:14px;padding:7px 0;border-bottom:1px dotted var(--line);font-size:14.5px}
.stack li b{white-space:nowrap;font-variant-numeric:tabular-nums;text-align:right}
.stack li b:has(mark),.stack li b.wrap{white-space:normal}
.stack li.total{border-bottom:none;border-top:2px solid var(--ink);margin-top:6px;padding-top:10px;font-weight:700}

footer{padding:34px 0 60px;color:var(--muted);font-size:13.5px;text-align:center}
hr.sep{border:none;border-top:1px solid var(--line);margin:26px 0}

@media (max-width:640px){
  section{padding:24px 18px;border-radius:12px}
  .hero-meta{gap:8px 16px}
  table{font-size:13.5px}
  th,td{padding:8px 9px}
}

/* study-tech vrstva */
.gl{border-bottom:1px dotted var(--blue);cursor:help;text-decoration:none;color:inherit}
.gl:hover{background:#EEF3FD;text-decoration:none}
.howto{border:2px solid var(--blue);border-radius:14px;padding:22px;background:linear-gradient(180deg,#FBFDFF,#F2F7FF);margin:0 0 24px}
.howto h3{margin-top:0}
.levels{display:grid;gap:12px;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));margin:14px 0}
.level{border:1px solid var(--line);border-radius:10px;padding:14px;background:#fff}
.level b{display:block;color:var(--blue);font-size:15px;margin-bottom:4px}
.level span{font-size:13.5px;color:var(--ink-2)}
.praxe{border-left:4px solid var(--gold);background:#FFFCF2;border-radius:0 12px 12px 0;padding:16px 18px;margin:20px 0}
.praxe .t{font-weight:700;display:block;margin-bottom:6px}
.check{border:1px dashed var(--line);border-radius:12px;padding:14px 18px;margin:16px 0;background:#FAFBFD}
.check .t{font-weight:700;font-size:14px;display:block;margin-bottom:6px;color:var(--ink-2)}
.check ol{margin:0;padding-left:20px;font-size:14px;color:var(--ink-2)}
.check li{margin-bottom:3px}
figure{margin:20px 0;border:1px solid var(--line);border-radius:12px;overflow:hidden;background:#fff}
figure img{width:100%;display:block}
figure figcaption{font-size:13.5px;color:var(--ink-2);padding:12px 16px;background:#F7F9FC;border-top:1px solid var(--line)}
figure figcaption b{color:var(--ink)}
.diagram{margin:20px 0;border:1px solid var(--line);border-radius:12px;padding:18px;background:#fff}
.diagram svg{width:100%;height:auto;display:block}
.diagram .cap{font-size:13.5px;color:var(--ink-2);margin-top:10px}
.glosar{display:grid;gap:0}
.glosar dt{font-weight:700;color:var(--ink);padding-top:12px;font-size:15px}
.glosar dd{margin:2px 0 0;padding-bottom:12px;border-bottom:1px solid var(--line);font-size:14.5px;color:var(--ink-2)}
.glosar dd em{color:var(--blue-dark);font-style:normal;font-weight:600}
.glosar-cols{columns:2;column-gap:32px}
@media (max-width:760px){.glosar-cols{columns:1}}
@media print{
  .howto,.praxe,.check,.diagram,figure{break-inside:avoid}
  .gl{border-bottom:none}
  figure img{max-height:none}
  .glosar-cols{columns:2}
  .glosar dt{font-size:9pt;padding-top:6px}
  .glosar dd{font-size:8.6pt;padding-bottom:6px}
}

@page{size:A4;margin:13mm 11mm}
@media print{
  html{font-size:15px}
  body{background:#fff;font-size:9.4pt;line-height:1.45;-webkit-print-color-adjust:exact;print-color-adjust:exact}
  .wrap{max-width:none;padding:0}
  nav.toc{display:none}
  header.hero{background:#0E2A5C!important;padding:22px 0 18px;border-radius:0}
  header.hero h1{font-size:24pt}
  header.hero p.lead{font-size:10pt}
  main{padding:0}
  section{break-inside:auto;box-shadow:none;border:none;border-radius:0;padding:0;margin:14px 0}
  section>h2{break-after:avoid;font-size:16pt;padding-bottom:7px;margin-bottom:12px}
  h3{font-size:11.6pt;margin-top:14px;break-after:avoid}
  h4{font-size:10.2pt}
  p{margin-bottom:.6em}
  table{font-size:8.2pt;margin:8px 0}
  th,td{padding:4px 6px}
  .tbl-scroll{overflow:visible}
  .stat .v{font-size:16pt}
  .card,.offer,.callout,.calc{break-inside:avoid;padding:12px 14px}
  .calc input,.calc select{border-color:#c9d3e4}
  .grid{gap:10px}
  table,.card,.offer,.callout{break-inside:avoid}
  a{color:var(--ink)!important;text-decoration:none}
  footer{padding:14px 0 0}
}

.offer .tag{vertical-align:2px;margin-left:6px}
.offer ul.clean li.src{color:var(--muted);font-size:13px;list-style:none;margin-left:-20px;padding-top:4px}
@media print{ .offer,.card,.diagram,.check{break-inside:avoid} }

/* ---------- print ---------- */
@media print{
  *{ -webkit-print-color-adjust:exact; print-color-adjust:exact }
  body{ background:#fff; font-size:11.5px; line-height:1.5 }
  nav.toc{ display:none }
  header.hero{ padding:28px 0 22px }
  main{ padding:0 }
  section{ break-inside:auto; page-break-inside:auto; margin:12px 0; padding:18px 16px; box-shadow:none }
  section>h2{ break-after:avoid; page-break-after:avoid }
  h3,h4{ break-after:avoid; page-break-after:avoid }
  tr,li,.card,.stat,.callout,.offer,.praxe{ break-inside:avoid; page-break-inside:avoid }
  table{ font-size:10.5px }
  th,td{ padding:6px 8px }
  a{ color:inherit; text-decoration:none }
  footer{ padding:18px 0 0 }
  @page{ margin:12mm 10mm }
}