:root {
  --nav: #222222;
  --nav-hover: #000;
  --link: #06c;
  --link-hover: #039;
  --text: #222;
  --muted: #555;
  --line: #d0d0d0;
  --soft: #f6f6f6;
  --btn: #eef6ee;
  --btn-border: #6aa56a;
  --max: 920px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--text);
  background: #fff;
  font: 14px/1.55 Tahoma, "Segoe UI", Arial, sans-serif;
}

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

.top {
  background: var(--nav);
  color: #fff;
}

.top-inner,
.brand-inner,
.wrap,
.foot-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 16px;
}

.top-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 36px;
  gap: 12px;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 2px 0;
}

.nav a {
  color: #fff;
  padding: 8px 10px;
  display: inline-block;
  text-decoration: none;
}

.nav a:hover,
.nav a.active {
  background: #000;
  text-decoration: none;
}

.lang {
  display: flex;
  gap: 8px;
  font-size: 12px;
  white-space: nowrap;
}

.lang a { color: #ccc; }
.lang a.active { color: #fff; font-weight: 700; }

.brand {
  border-bottom: 1px solid var(--line);
  background: #fff;
}

.brand-inner {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-top: 14px;
  padding-bottom: 14px;
}

.brand img {
  width: 48px;
  height: 48px;
  display: block;
}

.brand h1 {
  margin: 0;
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.3px;
}

.brand h1 a {
  color: #111;
  text-decoration: none;
}

.brand p {
  margin: 2px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.wrap { padding-top: 22px; padding-bottom: 40px; }

h2 {
  margin: 1.6em 0 0.5em;
  font-size: 20px;
  font-weight: 700;
}

h3 {
  margin: 1.3em 0 0.4em;
  font-size: 16px;
}

p { margin: 0.6em 0; }

.lead {
  font-size: 16px;
  max-width: 46em;
}

.sub {
  color: var(--muted);
  max-width: 46em;
}

ul, ol { margin: 0.4em 0 1em; padding-left: 1.4em; }
li { margin: 0.25em 0; }

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 16px 0 8px;
}

.btn {
  display: inline-block;
  padding: 8px 14px;
  border: 1px solid var(--btn-border);
  background: var(--btn);
  color: #163;
  text-decoration: none;
  font-weight: 700;
}

.btn:hover {
  background: #e2f3e2;
  color: #042;
  text-decoration: none;
}

.btn.ghost {
  background: #fff;
  border-color: #bbb;
  color: #333;
  font-weight: 600;
}

.btn.ghost:hover { background: var(--soft); color: #000; }

.dl-box {
  background: var(--soft);
  border: 1px solid var(--line);
  padding: 14px 16px;
  margin: 16px 0;
}

.dl-box h2 { margin-top: 0; }

.meta { color: var(--muted); font-size: 12px; }

.shots {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin: 12px 0 8px;
}

.shots figure,
.videos figure {
  margin: 0;
  border: 1px solid var(--line);
  background: #fff;
}

.shots img,
.videos video {
  width: 100%;
  display: block;
  background: #111;
}

.shots.wide { grid-template-columns: 1fr; }

figcaption {
  padding: 6px 8px;
  font-size: 12px;
  color: var(--muted);
  border-top: 1px solid var(--line);
}

.videos {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin: 12px 0;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 8px 0 16px;
  font-size: 13px;
}

th, td {
  border: 1px solid var(--line);
  padding: 6px 8px;
  text-align: left;
  vertical-align: top;
}

th { background: var(--soft); font-weight: 700; }

kbd, .key {
  font-family: Consolas, "Courier New", monospace;
  font-size: 12px;
  background: #f0f0f0;
  border: 1px solid #ccc;
  border-bottom-width: 2px;
  padding: 0 5px;
  border-radius: 3px;
  white-space: nowrap;
}

.cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin: 12px 0;
}

.card {
  border: 1px solid var(--line);
  padding: 10px 12px;
  background: #fff;
}

.card h3 { margin: 0 0 6px; }

.note {
  color: var(--muted);
  font-size: 13px;
}

hr {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 28px 0;
}

.toc a { display: inline-block; margin-right: 12px; }

footer {
  border-top: 1px solid var(--line);
  background: var(--soft);
  color: var(--muted);
  font-size: 12px;
  padding: 16px 0 24px;
}

.foot-nav { margin-bottom: 6px; }
.foot-nav a { margin-right: 10px; }

@media (max-width: 720px) {
  .shots,
  .videos,
  .cards { grid-template-columns: 1fr; }
  .brand h1 { font-size: 22px; }
  .top-inner { flex-wrap: wrap; padding: 4px 12px; }
  body { font-size: 15px; }
}