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

:root {
  --accent: #1a4a8a;
  --bg: #080e1a;
  --surface: rgba(255, 255, 255, 0.04);
  --border: rgba(255, 255, 255, 0.1);
  --text: rgba(255, 255, 255, 0.9);
  --muted: rgba(255, 255, 255, 0.4);
}

body {
  font-family: 'Roboto', sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: grid;
  grid-template-rows: auto 1fr auto;
}

/* ── Header ── */

.header {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  padding: 16px 32px;
  border-bottom: 1px solid var(--border);
}

.header-logo { height: 60px; width: auto; }

.header-title {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
}

/* ── Content ── */

.versions-rule {
  max-width: 720px;
  width: 100%;
  margin: 20px auto 0;
  padding: 0 32px;
  font-size: 12px;
  color: var(--muted);
  line-height: 1.5;
}

.versions-main { max-width: 720px; width: 100%; margin: 0 auto; padding: 32px; display: flex; flex-direction: column; gap: 16px; }

/* ── Группа версий (одна major.minor-ветка), сворачиваемая ── */

.version-group {
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface);
  overflow: hidden;
}

.version-group-summary {
  list-style: none;
  cursor: pointer;
  padding: 14px 18px;
  font-size: 13px;
  font-weight: 700;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 8px;
}

.version-group-summary::-webkit-details-marker { display: none; }

.version-group-summary::before {
  content: '▸';
  color: var(--muted);
  font-size: 11px;
  transition: transform 0.15s;
}

.version-group[open] .version-group-summary::before {
  transform: rotate(90deg);
}

.version-group-summary:hover { background: rgba(255,255,255,0.03); }

.version-group-list {
  padding: 4px 18px 18px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

/* ── Карточка одной версии (3-я цифра) ── */

.version-card {
  border-left: 2px solid var(--accent);
  padding: 2px 0 2px 14px;
}

.version-title {
  font-size: 13px;
  font-weight: 700;
  color: var(--muted);
  margin-bottom: 8px;
}

.version-items { list-style: none; display: flex; flex-direction: column; gap: 6px; }

.version-items li {
  font-size: 13px;
  line-height: 1.5;
  padding-left: 16px;
  position: relative;
  color: var(--text);
}

.version-items li::before {
  content: '—';
  position: absolute;
  left: 0;
  color: var(--muted);
}

/* ── Footer ── */

.footer {
  padding: 16px 32px;
  text-align: center;
  font-size: 11px;
  color: var(--muted);
  border-top: 1px solid var(--border);
}