/* Nulebo — společný styl pro všechny stránky */

:root {
  --bg: #101a24;
  --bg-alt: #16232f;
  --bg-contrast: #e9edf0;
  --fg: #e3e9ee;
  --fg-dim: #8b9aa6;
  --fg-inv: #101a24;
  --acc: #3fb3ae;
  --acc2: #d8a15a;
  --mono: ui-monospace, Consolas, "Liberation Mono", monospace;
  --sans: system-ui, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --rhythm: 76px;
  --gap: 24px;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.75;
  overflow-x: hidden;
}

img { max-width: 100%; height: auto; display: block; }

a { color: var(--acc); text-decoration: underline; text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
a:focus-visible,
:focus-visible { outline: 2px solid var(--acc); outline-offset: 3px; }

/* --- mřížka --- */

.grid {
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  column-gap: var(--gap);
}

.text { grid-column: 2 / 8; }
.lede { grid-column: 2 / 10; font-size: 20px; line-height: 1.7; color: var(--fg); }

/* --- hlavička a navigace --- */

.site-header {
  border-bottom: 1px solid rgba(139, 154, 166, .28);
  padding: 22px 0 18px;
}
.site-header .grid { align-items: baseline; row-gap: 12px; }

.brand {
  grid-column: 1 / 4;
  font-family: var(--mono);
  font-size: 15px;
  letter-spacing: .28em;
  text-transform: uppercase;
  color: var(--fg);
  text-decoration: none;
}
.brand:hover { color: var(--acc); }

.site-nav { grid-column: 5 / 13; }
.site-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px 22px;
}
.site-nav a {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--fg-dim);
  text-decoration: none;
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
}
.site-nav a:hover { color: var(--fg); border-bottom-color: var(--acc); }
.site-nav a[aria-current="page"] { color: var(--fg); border-bottom-color: var(--acc2); }

/* --- hrdlo stránky: hero --- */

.hero { padding: calc(var(--rhythm) * .9) 0 var(--rhythm); }
.hero .grid { row-gap: 0; }

.spine {
  grid-column: 1 / 2;
  grid-row: 1 / span 4;
  min-height: 260px;
  background-image: repeating-linear-gradient(
    to bottom,
    var(--acc) 0, var(--acc) 2px,
    transparent 2px, transparent 16px
  );
  background-size: 26px 100%;
  background-repeat: no-repeat;
  background-position: left top;
}

.hero h1 {
  grid-column: 2 / 11;
  grid-row: 1;
  margin: 0;
  font-family: var(--mono);
  font-weight: 600;
  font-size: clamp(26px, 3.4vw, 40px);
  line-height: 1.22;
  letter-spacing: .04em;
  text-transform: uppercase;
}
.hero h1 span { display: block; color: var(--fg-dim); }

.rule-double {
  grid-column: 2 / 11;
  grid-row: 2;
  margin: 26px 0 24px;
  border: 0;
  border-top: 1px solid var(--acc);
  border-bottom: 1px solid rgba(139, 154, 166, .4);
  height: 4px;
}

.hero .lede { grid-row: 3; margin: 0; }

.hero-meta {
  grid-column: 2 / 11;
  grid-row: 4;
  margin: 22px 0 0;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--acc2);
}

/* --- figury --- */

.fig-main { grid-column: 7 / 13; margin: 0; }
.fig-main img { width: 100%; }
figcaption {
  margin-top: 12px;
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: .06em;
  color: var(--fg-dim);
}
.fig-main-block { padding-bottom: var(--rhythm); }
.fig-main-block .fig-note { grid-column: 2 / 7; align-self: end; color: var(--fg-dim); margin: 0; }

/* --- sekce --- */

section { padding: var(--rhythm) 0; }
.band { background: var(--bg-alt); }

.sec-head {
  grid-column: 1 / 13;
  display: block;
  margin: 0 0 30px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(139, 154, 166, .28);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--fg-dim);
}
.sec-head b { color: var(--acc2); font-weight: 600; margin-right: 14px; }

h2 {
  grid-column: 2 / 10;
  margin: 0 0 18px;
  font-family: var(--mono);
  font-weight: 600;
  font-size: clamp(19px, 2.1vw, 24px);
  line-height: 1.35;
  letter-spacing: .05em;
  text-transform: uppercase;
}

h3 {
  grid-column: 2 / 8;
  margin: 34px 0 10px;
  font-family: var(--mono);
  font-weight: 600;
  font-size: 15px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--acc);
}

p { margin: 0 0 20px; }
.text > *:last-child { margin-bottom: 0; }

ul.checklist, ol.steps { grid-column: 2 / 8; margin: 0 0 20px; padding-left: 0; }
ul.checklist { list-style: none; }
ul.checklist li {
  position: relative;
  padding-left: 26px;
  margin-bottom: 10px;
}
ul.checklist li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .82em;
  width: 14px;
  height: 2px;
  background: var(--acc);
}
ol.steps { padding-left: 24px; }
ol.steps li { margin-bottom: 10px; padding-left: 6px; }
ol.steps li::marker { font-family: var(--mono); color: var(--acc2); font-size: 14px; }

.note {
  grid-column: 2 / 8;
  margin: 0;
  color: var(--fg-dim);
  font-size: 15.5px;
}

/* --- oddělovač --- */

.sep {
  grid-column: 1 / 13;
  display: flex;
  justify-content: center;
  gap: 10px;
  padding: 6px 0 0;
}
.sep span { width: 18px; height: 2px; background: var(--acc2); display: block; }

/* --- kontrastní sekce --- */

.contrast {
  background: var(--bg-contrast);
  color: var(--fg-inv);
}
.contrast .sec-head { color: #55636e; border-bottom-color: rgba(16, 26, 36, .22); }
.contrast .sec-head b { color: #a9772f; }
.contrast h3 { color: #17706c; }
.contrast a { color: #17706c; }
.contrast .note { color: #55636e; }
.contrast figcaption { color: #55636e; }
.contrast ul.checklist li::before { background: #17706c; }
.contrast .sep span { background: #a9772f; }

.fig-detail { grid-column: 2 / 6; margin: 0; }
.fig-detail img { width: 100%; }
.contrast .text-right { grid-column: 7 / 13; }

/* --- kontakt --- */

.contact-line {
  grid-column: 2 / 8;
  margin: 0 0 8px;
  font-family: var(--mono);
  font-size: 15px;
  letter-spacing: .06em;
}

/* --- About: buřička --- */

.dropcap::first-letter {
  float: left;
  font-family: var(--mono);
  font-size: 56px;
  line-height: .9;
  padding: 6px 12px 0 0;
  color: var(--acc);
}

/* --- patička --- */

.site-footer {
  border-top: 1px solid rgba(139, 154, 166, .28);
  padding: 46px 0 54px;
  text-align: center;
}
.site-footer .inner {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 24px;
}
.footer-name {
  font-family: var(--mono);
  font-size: 14px;
  letter-spacing: .3em;
  text-transform: uppercase;
  margin: 0 0 18px;
}
.footer-nav ul {
  list-style: none;
  margin: 0 0 18px;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
}
.footer-nav li { padding: 0 14px; border-left: 1px solid rgba(139, 154, 166, .4); line-height: 1.2; margin: 4px 0; }
.footer-nav li:first-child { border-left: 0; }
.footer-nav a {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--fg-dim);
  text-decoration: none;
}
.footer-nav a:hover { color: var(--acc); }
.footer-mail { margin: 0 0 10px; font-family: var(--mono); font-size: 14px; }
.footer-note { margin: 0; color: var(--fg-dim); font-size: 14px; line-height: 1.7; }

/* --- responzivita --- */

@media (max-width: 980px) {
  .text, .lede, h2, h3, ul.checklist, ol.steps, .note, .contact-line,
  .fig-main, .fig-detail, .contrast .text-right, .hero h1, .rule-double,
  .hero-meta, .fig-main-block .fig-note {
    grid-column: 1 / 13;
  }
  .spine { display: none; }
  .hero h1, .rule-double, .hero .lede, .hero-meta { grid-row: auto; }
  .fig-main { margin-bottom: 20px; }
  .fig-detail { max-width: 420px; margin-bottom: 26px; }
  .brand { grid-column: 1 / 8; }
  .site-nav { grid-column: 1 / 13; }
  .site-nav ul { justify-content: flex-start; }
}

@media (max-width: 640px) {
  :root { --rhythm: 46px; --gap: 16px; }
  body { font-size: 16.5px; }
  .grid { padding: 0 18px; }
  .lede { font-size: 18px; }
  .hero { padding: 34px 0 46px; }
  .site-footer .inner { padding: 0 18px; }
  .dropcap::first-letter { font-size: 44px; }
}