:root {
  --paper: #f7faf9;
  --card: #ffffff;
  --grain: #d3deda;
  --grain-soft: #e6edea;
  --foam: #152420;
  --straw: #4e615b;
  --straw-dim: #7b8b86;
  --amber: #d97706;
  --primary: #0e6b63;
  --primary-hover: #0b564f;
  --serif: Georgia, 'Times New Roman', 'Iowan Old Style', serif;
  --mono: ui-monospace, 'SF Mono', 'Cascadia Code', Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  background: var(--paper);
  color: var(--foam);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
::selection { background: var(--primary); color: #fff; }
a { color: var(--primary); }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 2px solid var(--primary); outline-offset: 3px; border-radius: 2px; }

.wrap { max-width: 760px; margin: 0 auto; padding: 0 24px; }
.wrap-wide { max-width: 1000px; margin: 0 auto; padding: 0 24px; }

nav.top {
  position: sticky; top: 0; z-index: 50;
  background: rgba(247, 250, 249, 0.9);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--grain-soft);
}
.nav-inner { max-width: 1000px; margin: 0 auto; padding: 14px 24px; display: flex; align-items: center; gap: 24px; }
.logo { font-family: var(--serif); font-size: 21px; font-weight: 700; color: var(--foam); text-decoration: none; }
.logo .os { font-family: var(--mono); font-weight: 400; font-size: 15px; color: var(--primary); vertical-align: 2px; margin-left: 1px; }
.nav-links { margin-left: auto; display: flex; gap: 20px; align-items: center; }
.nav-links a { font-family: var(--mono); font-size: 12.5px; letter-spacing: 0.06em; text-transform: uppercase; color: var(--straw); text-decoration: none; }
.nav-links a:hover { color: var(--foam); }
.nav-cta {
  font-family: var(--mono); font-size: 12.5px; letter-spacing: 0.06em; text-transform: uppercase;
  color: #fff !important; background: var(--primary); padding: 9px 16px; border-radius: 4px; font-weight: 700; text-decoration: none;
}
.nav-cta:hover { background: var(--primary-hover); }

/* ---------- article ---------- */
article.post { padding: 64px 0 40px; }
.post-eyebrow { font-family: var(--mono); font-size: 12px; letter-spacing: 0.16em; text-transform: uppercase; color: var(--primary); margin-bottom: 16px; }
.post h1 { font-family: var(--serif); font-weight: 700; font-size: clamp(1.9rem, 4vw, 2.7rem); line-height: 1.14; letter-spacing: -0.01em; margin-bottom: 14px; text-wrap: balance; }
.post-meta { font-family: var(--mono); font-size: 12.5px; color: var(--straw-dim); margin-bottom: 34px; }
.post-meta a { color: var(--straw-dim); }

.tldr {
  border: 1px solid var(--grain); border-left: 3px solid var(--primary); border-radius: 8px;
  background: var(--card); padding: 16px 20px; margin-bottom: 34px; font-size: 15.5px; color: var(--straw);
}
.tldr b { font-family: var(--mono); font-size: 11.5px; letter-spacing: 0.14em; color: var(--primary); display: block; margin-bottom: 6px; }

.post-body h2 { font-family: var(--serif); font-size: 1.45rem; font-weight: 700; line-height: 1.25; margin: 38px 0 14px; text-wrap: balance; }
.post-body h3 { font-family: var(--serif); font-size: 1.15rem; font-weight: 700; margin: 28px 0 10px; }
.post-body p { margin: 0 0 16px; color: var(--straw); }
.post-body strong { color: var(--foam); }
.post-body ul, .post-body ol { margin: 0 0 16px 22px; color: var(--straw); }
.post-body li { margin-bottom: 8px; }
.post-body blockquote {
  border-left: 3px solid var(--grain); padding: 4px 0 4px 18px; margin: 0 0 16px;
  font-family: var(--serif); font-size: 1.06em; color: var(--foam);
}
.post-body .tablewrap { overflow-x: auto; margin: 0 0 16px; }
.post-body table { border-collapse: collapse; width: 100%; font-size: 14.5px; }
.post-body th, .post-body td { border: 1px solid var(--grain-soft); padding: 9px 12px; text-align: left; color: var(--straw); }
.post-body th { font-family: var(--mono); font-size: 12px; letter-spacing: 0.06em; text-transform: uppercase; color: var(--foam); background: var(--card); }
.post-body code { font-family: var(--mono); font-size: 0.88em; background: var(--card); border: 1px solid var(--grain-soft); border-radius: 4px; padding: 1px 5px; }

.faq { margin-top: 44px; border-top: 1px solid var(--grain-soft); padding-top: 10px; }
.faq h2 { font-family: var(--serif); font-size: 1.45rem; margin: 24px 0 6px; }
.faq details { border-bottom: 1px solid var(--grain-soft); padding: 14px 0; }
.faq summary { font-weight: 600; color: var(--foam); cursor: pointer; }
.faq details p { margin-top: 10px; color: var(--straw); }

.post-cta {
  margin: 48px 0 0; border: 1px solid rgba(14, 107, 99, 0.4); border-radius: 12px;
  background: var(--card); padding: 28px; text-align: center;
}
.post-cta .t { font-family: var(--serif); font-size: 1.35rem; font-weight: 700; margin-bottom: 10px; }
.post-cta p { color: var(--straw); max-width: 54ch; margin: 0 auto 18px; font-size: 15px; }
.btn-primary {
  display: inline-block; font-family: var(--mono); font-size: 14px; font-weight: 700;
  padding: 13px 22px; border-radius: 5px; background: var(--primary); color: #fff !important; text-decoration: none;
}
.btn-primary:hover { background: var(--primary-hover); }

.related { margin-top: 48px; border-top: 1px solid var(--grain-soft); padding-top: 24px; }
.related .rt { font-family: var(--mono); font-size: 12px; letter-spacing: 0.16em; text-transform: uppercase; color: var(--straw-dim); margin-bottom: 14px; }
.related ul { list-style: none; }
.related li { margin-bottom: 10px; }
.related a { font-size: 15.5px; }
.related .rd { font-family: var(--mono); font-size: 12px; color: var(--straw-dim); margin-left: 8px; white-space: nowrap; }

/* ---------- listing ---------- */
.blog-head { padding: 72px 0 20px; }
.blog-head h1 { font-family: var(--serif); font-size: clamp(2rem, 4.5vw, 3rem); font-weight: 700; margin-bottom: 14px; }
.blog-head p { color: var(--straw); max-width: 62ch; }
.cat-row { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 22px; }
.cat-chip {
  font-family: var(--mono); font-size: 11.5px; letter-spacing: 0.06em;
  border: 1px solid var(--grain); border-radius: 999px; padding: 5px 12px; color: var(--straw); text-decoration: none;
}
.cat-chip:hover { border-color: var(--primary); color: var(--primary); }

.post-list { padding: 28px 0 80px; }
.pl-item { border-top: 1px solid var(--grain-soft); padding: 22px 0; display: grid; grid-template-columns: 128px 1fr; gap: 20px; }
@media (max-width: 640px) { .pl-item { grid-template-columns: 1fr; gap: 6px; } }
.pl-date { font-family: var(--mono); font-size: 12.5px; color: var(--straw-dim); padding-top: 4px; }
.pl-title { font-family: var(--serif); font-size: 1.2rem; font-weight: 700; line-height: 1.3; }
.pl-title a { color: var(--foam); text-decoration: none; }
.pl-title a:hover { color: var(--primary); }
.pl-desc { color: var(--straw); font-size: 14.5px; margin-top: 6px; }
.pl-cat { font-family: var(--mono); font-size: 11px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--primary); margin-top: 6px; }

footer { border-top: 1px solid var(--grain-soft); padding: 36px 0 56px; }
.foot-note { font-size: 12.5px; color: var(--straw-dim); max-width: 76ch; line-height: 1.7; margin-top: 10px; }