:root {
  --pozadi: #0b0b0d;
  --karta: #16161a;
  --text: #f2f2f5;
  --text-slaby: #9a9aa5;
  --modra: #0047ab;
  --modra-svetla: #4d8dff;
  --okraj: #26262d;
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --pozadi: #ffffff;
    --karta: #f5f5f7;
    --text: #16161a;
    --text-slaby: #5c5c66;
    --modra: #0047ab;
    --modra-svetla: #0047ab;
    --okraj: #e2e2e8;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  padding: 0 16px;
  background: var(--pozadi);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.obal { max-width: 720px; margin: 0 auto; padding: 56px 0 80px; }

header { margin-bottom: 40px; }

.znacka {
  font-size: 15px;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--modra-svetla);
  font-weight: 700;
  text-decoration: none;
  display: inline-block;
}

h1 { font-size: 34px; line-height: 1.2; margin: 24px 0 12px; }
h2 { font-size: 20px; margin: 36px 0 8px; }
h3 { font-size: 16px; margin: 24px 0 6px; color: var(--text); }

p, li { color: var(--text-slaby); }
p.hlavni { font-size: 19px; color: var(--text); }

a { color: var(--modra-svetla); }

.karta {
  background: var(--karta);
  border: 1px solid var(--okraj);
  border-radius: 16px;
  padding: 20px 22px;
  margin: 24px 0;
}

.karta h3 { margin-top: 0; }

ul { padding-left: 20px; }
li { margin-bottom: 6px; }

.kroky { list-style: none; padding: 0; counter-reset: krok; }
.kroky li {
  counter-increment: krok;
  position: relative;
  padding-left: 42px;
  margin-bottom: 16px;
  color: var(--text);
}
.kroky li::before {
  content: counter(krok);
  position: absolute;
  left: 0;
  top: 0;
  width: 28px;
  height: 28px;
  border-radius: 14px;
  background: var(--modra);
  color: #fff;
  font-weight: 700;
  font-size: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.tlacitko {
  display: inline-block;
  background: var(--modra);
  color: #fff;
  text-decoration: none;
  font-weight: 600;
  padding: 14px 24px;
  border-radius: 14px;
  margin-top: 8px;
}

footer {
  margin-top: 56px;
  padding-top: 20px;
  border-top: 1px solid var(--okraj);
  font-size: 14px;
  color: var(--text-slaby);
}

footer a { margin-right: 16px; }

.datum { font-size: 14px; color: var(--text-slaby); margin-top: 0; }