/* Prokoni — společný styl pro všechny stránky */

:root {
  --bg: #101a24;
  --bg-alt: #16232f;
  --bg-contrast: #e9edf0;
  --text: #e3e9ee;
  --text-dim: #8b9aa6;
  --text-on-contrast: #101a24;
  --dim-on-contrast: #4c5a66;
  --accent: #3fb3ae;
  --accent-deep: #1b6a67;
  --accent-2: #d8a15a;
  --line: rgba(139, 154, 166, 0.28);
  --serif: Georgia, 'Times New Roman', serif;
  --sans: system-ui, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 18px;
  line-height: 1.9;
  overflow-x: hidden;
}

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

a { color: var(--accent); text-decoration: underline; text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }

a:focus-visible,
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

/* ---------- mřížka ---------- */

.wrap {
  width: 100%;
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 24px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  column-gap: 28px;
  row-gap: 32px;
}

.c-center-6 { grid-column: 4 / span 6; }
.c-center-8 { grid-column: 3 / span 8; }
.c-center-4 { grid-column: 5 / span 4; }
.c-left-4   { grid-column: 2 / span 4; }
.c-right-4  { grid-column: 8 / span 4; }
.c-left-5   { grid-column: 1 / span 5; }
.c-right-6  { grid-column: 7 / span 6; }
.c-left-6   { grid-column: 1 / span 6; }
.c-narr-7   { grid-column: 1 / span 7; }
.c-narr-7-r { grid-column: 6 / span 7; }
.c-side-l   { grid-column: 2 / span 3; }
.c-side-r   { grid-column: 9 / span 3; }

/* ---------- rytmus sekcí ---------- */

.s-64 { padding-block: 64px; }
.s-80 { padding-block: 80px; }
.s-96 { padding-block: 96px; }

.band-alt { background: var(--bg-alt); }

.band-contrast {
  background: var(--bg-contrast);
  color: var(--text-on-contrast);
}
.band-contrast a { color: var(--accent-deep); }
.band-contrast .lead,
.band-contrast .caption,
.band-contrast .note { color: var(--dim-on-contrast); }
.band-contrast .arc { border-top-color: rgba(16, 26, 36, 0.35); }
.band-contrast h2 { color: var(--text-on-contrast); }
.band-contrast li::marker { color: var(--accent-deep); }
.band-contrast a:focus-visible { outline-color: var(--accent-deep); }

/* ---------- typografie ---------- */

h1, h2, h3 {
  font-family: var(--serif);
  font-weight: 400;
  line-height: 1.3;
  margin: 0 0 20px;
}

h1 {
  font-size: clamp(1.9rem, 4.4vw, 2.9rem);
  letter-spacing: 0.005em;
}

h2 {
  font-size: clamp(1.35rem, 2.6vw, 1.85rem);
  margin-bottom: 18px;
}

h3 {
  font-size: 1.12rem;
  margin-bottom: 10px;
  color: var(--text);
}
.band-contrast h3 { color: var(--text-on-contrast); }

p { margin: 0 0 26px; }
p:last-child { margin-bottom: 0; }

.num {
  font-family: var(--sans);
  font-size: 14px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent-2);
  margin: 0 0 14px;
  line-height: 1.6;
}

.lead { color: var(--text-dim); }

.caption {
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-dim);
  margin: 14px 0 0;
}

.note {
  font-size: 15px;
  color: var(--text-dim);
}

ul, ol { margin: 0 0 26px; padding-left: 22px; }
li { margin-bottom: 10px; }
li::marker { color: var(--accent); }

.dl { margin: 0; }
.dl dt {
  font-family: var(--serif);
  font-size: 1.05rem;
  margin-bottom: 4px;
}
.dl dd {
  margin: 0 0 22px;
  color: var(--text-dim);
  font-size: 17px;
}
.dl dd:last-child { margin-bottom: 0; }

.center { text-align: center; }

/* ---------- oblouk jako oddělovač ---------- */

.arc {
  width: 33.333%;
  min-width: 180px;
  height: 34px;
  margin: 0 auto;
  border: 1px solid transparent;
  border-top-color: var(--line);
  border-bottom: 0;
  border-radius: 50% 50% 0 0 / 100% 100% 0 0;
}

.arc-accent { border-top-color: rgba(63, 179, 174, 0.5); }

/* ---------- hlavička a navigace ---------- */

.site-head {
  border-bottom: 1px solid var(--line);
  padding-block: 22px;
}

.head-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 28px;
  align-items: baseline;
  justify-content: center;
  text-align: center;
}

.brand {
  font-family: var(--serif);
  font-size: 1.25rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text);
  text-decoration: none;
}
.brand:hover { color: var(--accent); }

.site-nav ul {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 6px 22px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.site-nav li { margin: 0; }
.site-nav a {
  font-size: 15px;
  color: var(--text-dim);
  text-decoration: none;
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
}
.site-nav a:hover { color: var(--text); border-bottom-color: var(--accent); }
.site-nav a[aria-current="page"] { color: var(--text); border-bottom-color: var(--accent-2); }

/* ---------- hero s osou ---------- */

.hero {
  position: relative;
  padding-block: 84px 72px;
}

.hero::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 1px;
  background: linear-gradient(
    to bottom,
    rgba(63, 179, 174, 0) 0%,
    rgba(63, 179, 174, 0.55) 18%,
    rgba(63, 179, 174, 0.55) 82%,
    rgba(63, 179, 174, 0) 100%
  );
}

.hero .wrap { position: relative; }

.hero-top { text-align: center; }
.hero-top h1 { max-width: 18ch; margin-inline: auto; }
.hero-top .lead { max-width: 62ch; margin-inline: auto; }

.hero-sides { margin-top: 52px; }
.hero-sides h2 {
  font-size: 1.02rem;
  font-family: var(--sans);
  letter-spacing: 0.02em;
  margin-bottom: 8px;
}
.hero-sides p { font-size: 16px; line-height: 1.8; color: var(--text-dim); }

/* ---------- obrázky ---------- */

.fig-main {
  max-width: 600px;
  margin: 0 auto;
  text-align: center;
}
.fig-main img { width: 100%; }

.fig-detail { margin: 0; }
.fig-detail img { width: 100%; }
.fig-detail .caption { text-align: left; }

/* ---------- obsah / rozcestník ---------- */

.toc {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 6px 32px;
}
.toc li {
  border-top: 1px solid var(--line);
  padding-top: 10px;
  margin-bottom: 12px;
  font-size: 16px;
}

/* ---------- patička ---------- */

.site-foot {
  padding-block: 56px 64px;
  border-top: 0;
  text-align: center;
}

.foot-brand {
  font-family: var(--serif);
  font-size: 1.2rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin: 30px 0 22px;
}

.foot-nav ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px 0;
  margin: 0 0 24px;
  padding: 0;
}
.foot-nav li { margin: 0; }
.foot-nav li + li::before {
  content: "·";
  color: var(--accent-2);
  padding: 0 14px;
}
.foot-nav a { font-size: 15px; color: var(--text-dim); text-decoration: none; }
.foot-nav a:hover { color: var(--accent); }

.foot-mail { margin: 0 0 14px; }
.foot-note {
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-dim);
  max-width: 56ch;
  margin: 0 auto;
}

/* ---------- responzivita ---------- */

@media (max-width: 900px) {
  .c-center-6, .c-center-8, .c-center-4,
  .c-left-4, .c-right-4, .c-left-5, .c-right-6, .c-left-6,
  .c-narr-7, .c-narr-7-r, .c-side-l, .c-side-r {
    grid-column: 1 / -1;
  }
  .grid { row-gap: 28px; }
}

@media (max-width: 640px) {
  body { font-size: 17px; line-height: 1.85; }
  .wrap { padding: 0 18px; }
  .s-64, .s-80, .s-96 { padding-block: 44px; }
  .s-96 { padding-block: 56px; }
  .hero { padding-block: 48px 44px; }
  .hero::before { display: none; }
  .hero-sides { margin-top: 34px; }
  .fig-main { max-width: 100%; }
  .foot-nav li + li::before { padding: 0 10px; }
  .arc { width: 60%; height: 26px; }
}