:root {
  --accent: #0f766e;
  --accent-soft: #14b8a6;
  --ink: #1a1f24;
  --muted: #5b6770;
  --bg: #f3f6f5;
  --font-display: "Space Grotesk", sans-serif;
  --font-body: "IBM Plex Sans", sans-serif;
}
* { box-sizing: border-box; }
body {
  font-family: var(--font-body);
  color: var(--ink);
  background:
    radial-gradient(1200px 600px at 10% -10%, rgba(20,184,166,0.18), transparent 55%),
    radial-gradient(900px 500px at 100% 0%, rgba(15,118,110,0.12), transparent 50%),
    var(--bg);
  margin-top: 64px;
  line-height: 1.65;
}
.transparent-navbar {
  background: rgba(243,246,245,0.85) !important;
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(15,118,110,0.12);
}
.nav-logo { height: 32px; margin-right: 12px; }
.navbar-brand, .nav-link { color: var(--ink) !important; }
.dropdown-menu { max-height: 70vh; overflow: auto; }
.hero {
  min-height: calc(100vh - 64px);
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 3rem 1.25rem 4rem;
  max-width: 920px;
  margin: 0 auto;
}
.hero .brand {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 6vw, 4rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--accent);
  margin: 0 0 0.75rem;
}
.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3.5vw, 2.2rem);
  font-weight: 500;
  letter-spacing: -0.02em;
  margin: 0 0 0.75rem;
}
.hero p {
  color: var(--muted);
  font-size: 1.1rem;
  max-width: 38rem;
  margin-bottom: 1.75rem;
}
.cta {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--accent);
  color: #fff !important;
  text-decoration: none !important;
  padding: 0.85rem 1.25rem;
  font-weight: 500;
  border-radius: 2px;
  transition: transform .2s ease, background .2s ease;
}
.cta:hover { background: #0b5f59; transform: translateY(-2px); color: #fff !important; }
.toc {
  max-width: 920px;
  margin: 0 auto 4rem;
  padding: 0 1.25rem;
}
.toc h2 {
  font-family: var(--font-display);
  font-size: 1.25rem;
  margin-bottom: 1rem;
}
.toc a {
  display: block;
  padding: 0.85rem 0;
  border-bottom: 1px solid rgba(26,31,36,0.08);
  color: var(--ink);
  text-decoration: none;
  transition: color .15s ease, padding-left .15s ease;
}
.toc a:hover { color: var(--accent); padding-left: 0.35rem; }
.toc .num { color: var(--accent-soft); font-family: var(--font-display); margin-right: 0.6rem; }
.page {
  max-width: 820px;
  margin: 0 auto;
  padding: 2rem 1.25rem 4rem;
}
.page-header {
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid rgba(26,31,36,0.1);
}
.page-header .eyebrow {
  color: var(--accent);
  font-family: var(--font-display);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 0.35rem;
}
.page-header h1 {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  letter-spacing: -0.02em;
  margin: 0;
}
.content h2, .content h3, .content h4 {
  font-family: var(--font-display);
  letter-spacing: -0.02em;
  margin-top: 1.75rem;
}
.content a[href^="http"] {
  color: #fff;
  background: var(--accent-soft);
  padding: 0.1rem 0.45rem;
  text-decoration: none;
  font-weight: 500;
}
.content a[href^="http"]:hover { background: var(--accent); }
.content iframe { max-width: 100%; }
.content img { max-width: 100%; height: auto; }
.content hr { border: 0; border-top: 1px solid rgba(26,31,36,0.08); margin: 1.25rem 0; }
.author {
  color: var(--muted);
  font-size: 0.95rem;
  margin-top: 0.35rem;
}