:root {
  --bg: #f7f8fa;
  --bg-card: #ffffff;
  --ink: #1a2230;
  --ink-soft: #4b586c;
  --line: #dde3ec;
  --accent: #1d5fd6;
  --accent-ink: #ffffff;
  --accent-soft: #e8effc;
  --warn-bg: #fdf6e3;
  --warn-line: #e6d9a8;
  --warn-ink: #6b5d1f;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #10151d;
    --bg-card: #182030;
    --ink: #e6ebf4;
    --ink-soft: #9daabf;
    --line: #2a3549;
    --accent: #4d8bff;
    --accent-ink: #0b1220;
    --accent-soft: #1d2c47;
    --warn-bg: #2b2611;
    --warn-line: #57491c;
    --warn-ink: #e3cf7a;
  }
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.wrap { max-width: 1000px; margin: 0 auto; padding: 0 24px; }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---------- Hlavička + záložky ---------- */
header.site {
  background: var(--bg-card);
  border-bottom: 1px solid var(--line);
}
.site-top {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 14px;
  padding: 26px 0 14px;
}
.site-top .brand {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-size:3rem;
  font-weight: 750;
  letter-spacing: -0.02em;
  color: var(--ink);
}
.site-top .brand:hover { text-decoration: none; }
.site-top .brand img { width: 60px; height: 60px; display: block; }
.site-top .brand-sub {
  font-size: .95rem;
  color: var(--ink-soft);
}
.github-link, .email-link {
  align-self: center;
  display: inline-flex;
  color: var(--ink-soft);
}
.github-link { margin-left: auto; }
.github-link:hover, .email-link:hover { color: var(--ink); text-decoration: none; }
.github-link svg, .email-link svg { width: 26px; height: 26px; display: block; }
.email-link svg { width: 24px; height: 24px; }

nav.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-bottom: -1px;
}
nav.tabs a {
  display: inline-block;
  padding: 8px 18px;
  font-size: .97rem;
  color: var(--ink-soft);
  background: var(--bg);
  border: 1px solid var(--line);
  border-bottom: none;
  border-radius: 8px 8px 0 0;
}
nav.tabs a:hover {
  text-decoration: none;
  color: var(--ink);
}
nav.tabs a.active {
  background: var(--bg);
  color: var(--ink);
  font-weight: 650;
  position: relative;
}
nav.tabs a.active::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -1px;
  height: 2px;
  background: var(--bg);
}
nav.tabs a:not(.active) {
  background: var(--bg-card);
}

main { padding: 44px 0 56px; }
main section + section { margin-top: 44px; }

h1 { font-size: 1.9rem; letter-spacing: -0.02em; margin-bottom: 16px; }
h2 { font-size: 1.35rem; letter-spacing: -0.01em; margin-bottom: 14px; }
h3 { font-size: 1.05rem; margin-bottom: 8px; }
p + p { margin-top: 12px; }

.lede { max-width: 46em; color: var(--ink-soft); }
.lede strong { color: var(--ink); }

/* ---------- Hero (text + ilustrace) ---------- */
.hero-row {
  display: flex;
  flex-wrap: wrap-reverse;
  gap: 36px;
  align-items: center;
}
.hero-row .hero-text { flex: 1 1 360px; }
.hero-row .hero-illustration { flex: 1 1 300px; max-width: 380px; }
.hero-row .hero-illustration .shot-caption { font-size: .85rem; }

/* ---------- Tlačítka ---------- */
.btn-primary {
  display: inline-block;
  background: var(--accent);
  color: var(--accent-ink);
  font-weight: 650;
  font-size: 1.02rem;
  padding: 13px 26px;
  border-radius: 10px;
  box-shadow: 0 2px 10px rgba(29, 95, 214, .25);
}
.btn-primary:hover { text-decoration: none; filter: brightness(1.08); }
.btn-note { font-size: .85rem; color: var(--ink-soft); margin-top: 8px; }

/* ---------- Screenshot ---------- */
.shot {
  border: 1px solid var(--line);
  border-radius: 14px;
  overflow: hidden;
  background: var(--bg-card);
  box-shadow: 0 8px 30px rgba(10, 20, 40, .08);
}
.shot img { display: block; width: 100%; max-width: 100%; height: auto; cursor: zoom-in; }
.shot-caption {
  margin-top: 12px;
  font-size: .9rem;
  color: var(--ink-soft);
  text-align: center;
}

/* ---------- Lightbox ---------- */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 5vh 5vw;
  background: rgba(8, 11, 18, .9);
  cursor: zoom-out;
}
.lightbox[hidden] { display: none; }
.lightbox img {
  display: block;
  max-width: 100%;
  max-height: 100%;
  border-radius: 10px;
  box-shadow: 0 12px 60px rgba(0, 0, 0, .5);
  cursor: default;
}
.lightbox-close {
  position: fixed;
  top: 18px;
  right: 22px;
  width: 42px;
  height: 42px;
  border: none;
  border-radius: 50%;
  background: rgba(255, 255, 255, .12);
  color: #fff;
  font-size: 1.5rem;
  line-height: 1;
  cursor: pointer;
}
.lightbox-close:hover { background: rgba(255, 255, 255, .22); }

/* ---------- Karty ---------- */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 18px;
}
.card {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 22px 22px 20px;
}
.card h3 {
  display: flex;
  align-items: center;
  gap: 10px;
}
.card p { font-size: .95rem; color: var(--ink-soft); }
.card svg { flex: none; width: 22px; height: 22px; color: var(--accent); }

/* ---------- Stažení ---------- */
.dl-item {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 26px 26px 24px;
}
.dl-item + .dl-item { margin-top: 18px; }
.dl-item h2 { display: flex; align-items: center; gap: 10px; margin-bottom: 6px; }
.dl-item h2 svg, .dl-item h2 img { flex: none; width: 24px; height: 24px; color: var(--accent); }
.dl-item .dl-meta { font-size: .92rem; color: var(--ink-soft); margin-bottom: 16px; }
.dl-item ul { margin: 10px 0 0 20px; font-size: .93rem; color: var(--ink-soft); }
.dl-item li { margin-top: 4px; }
.dl-item code {
  font-size: .88em;
  background: var(--accent-soft);
  border-radius: 5px;
  padding: 1px 6px;
}

.warn {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  background: var(--warn-bg);
  border: 1px solid var(--warn-line);
  border-radius: 10px;
  padding: 14px 16px;
  margin-top: 16px;
  font-size: .92rem;
  color: var(--warn-ink);
}
.warn svg { flex: none; width: 20px; height: 20px; margin-top: 2px; }
.warn strong { font-weight: 650; }

.req { margin-top: 34px; }
.req ul { list-style: none; }
.req li {
  font-size: .92rem;
  color: var(--ink-soft);
  padding: 5px 0 5px 24px;
  position: relative;
}
.req li::before {
  content: "";
  position: absolute;
  left: 4px; top: .78em;
  width: 9px; height: 9px;
  border: 1.5px solid var(--accent);
  border-radius: 50%;
}

/* ---------- Patička ---------- */
footer {
  border-top: 1px solid var(--line);
  padding: 24px 0 36px;
  font-size: .9rem;
  color: var(--ink-soft);
}
footer .wrap { display: flex; flex-wrap: wrap; gap: 16px; justify-content: space-between; }

@media (max-width: 560px) {
  main { padding: 32px 0 44px; }
  nav.tabs a { padding: 7px 12px; font-size: .9rem; }
  .dl-item { padding: 20px 18px; }
}