/* rtunl blog — static release notes, phone-first, no external assets. */
:root {
  --bg: #f6f8fa;
  --card: #ffffff;
  --ink: #1c2733;
  --muted: #5c6b7a;
  --line: #e2e8f0;
  --accent: #2563eb;
  --accent-ink: #1e4fd6;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--ink);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-ink); text-decoration: underline; }

.wrap { max-width: 720px; margin: 0 auto; padding: 24px 16px 48px; }

.masthead {
  display: flex; align-items: baseline; justify-content: space-between; gap: 12px;
  padding: 8px 0 20px; border-bottom: 1px solid var(--line); margin-bottom: 28px;
}
.masthead .brand { font-weight: 800; font-size: 1.05rem; letter-spacing: -.01em; color: var(--ink); }
.masthead .tag { color: var(--muted); font-size: .85rem; }
.masthead a { text-decoration: none; }

.post { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 22px; }
.post + .post { margin-top: 16px; }
.post h2 { margin: 0 0 6px; font-size: 1.25rem; line-height: 1.3; }
.post h2 a { color: var(--ink); text-decoration: none; }
.post h2 a:hover { color: var(--accent); text-decoration: none; }
.post .date { color: var(--muted); font-size: .82rem; margin: 0 0 12px; }
.post p { margin: 0 0 12px; }
.post p:last-child { margin-bottom: 0; }
.post .more { font-weight: 600; }

.article h1 { font-size: 1.5rem; line-height: 1.25; margin: 0 0 6px; }
.article .date { color: var(--muted); font-size: .85rem; margin: 0 0 20px; }
.article h2 { font-size: 1.08rem; margin: 26px 0 8px; }
.article ul { margin: 0 0 14px; padding-left: 22px; }
.article li { margin: 0 0 6px; }
.article .back { display: inline-block; margin-top: 24px; font-weight: 600; }

.foot { text-align: center; color: var(--muted); font-size: .8rem; margin-top: 32px; }
.foot a { color: var(--muted); text-decoration: underline; }