:root {
  --bg: #fafaf7;
  --ink: #1d2321;
  --muted: #66706c;
  --line: #e6e6df;
  --accent: #2f7d5b;
  --accent-soft: #e5f1eb;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.7;
  font-size: 17px;
}
a { color: var(--accent); }
.wrap { width: min(760px, 90%); margin: 0 auto; }

header { border-bottom: 1px solid var(--line); background: #fff; }
header .wrap { display: flex; justify-content: space-between; align-items: center; height: 64px; }
.brand { font-weight: 700; font-size: 19px; color: var(--ink); text-decoration: none; display: flex; align-items: center; gap: 10px; }
.brand svg { width: 28px; height: 28px; }
nav a { margin-left: 22px; color: var(--ink); text-decoration: none; font-size: 15px; }
nav a:hover { color: var(--accent); }

.intro { padding: 56px 0 24px; }
.intro h1 { font-size: 38px; line-height: 1.2; margin: 0 0 12px; }
.intro p { color: var(--muted); margin: 0; font-size: 18px; }

.post-list { list-style: none; padding: 0; margin: 24px 0 64px; }
.post-list li { padding: 26px 0; border-bottom: 1px solid var(--line); }
.post-list h2 { font-size: 23px; margin: 6px 0 8px; line-height: 1.3; }
.post-list h2 a { color: var(--ink); text-decoration: none; }
.post-list h2 a:hover { color: var(--accent); }
.post-list p { margin: 0; color: var(--muted); }
.meta { font-size: 14px; color: var(--muted); }
.tag { display: inline-block; background: var(--accent-soft); color: var(--accent); font-size: 13px; padding: 2px 10px; border-radius: 999px; margin-right: 8px; }

article { padding: 48px 0 64px; }
article h1 { font-size: 34px; line-height: 1.25; margin: 10px 0 8px; }
article h2 { font-size: 23px; margin: 36px 0 10px; }
article p, article li { margin: 0 0 14px; }
article ul, article ol { padding-left: 22px; }
.note { background: var(--accent-soft); border-left: 4px solid var(--accent); padding: 14px 18px; border-radius: 6px; margin: 24px 0; }
.back { display: inline-block; margin-top: 30px; font-size: 15px; }

footer { border-top: 1px solid var(--line); padding: 28px 0; color: var(--muted); font-size: 14px; }

.notfound { text-align: center; padding: 110px 0; }
.notfound h1 { font-size: 72px; margin: 0; color: var(--accent); }

@media (max-width: 560px) {
  .intro h1 { font-size: 30px; }
  article h1 { font-size: 27px; }
  nav a { margin-left: 14px; }
}