:root {
  --bg: #f3f7f5;
  --bg-alt: #e6efeb;
  --ink: #12211f;
  --muted: #4d5f5b;
  --accent: #0f6b62;
  --accent-ink: #f4fffc;
  --card: #fbfffe;
  --line: #cfe0da;
  --hero: #0f3d3e;
  --hero-ink: #eef7f5;
  --ok: #1f6b4a;
  --warn: #8a5a12;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(16, 18, 24, 0.08);
  --sans: ui-sans-serif, "Segoe UI", system-ui, sans-serif;
  --serif: Georgia, "Palatino Linotype", Palatino, serif;
  --max: 1120px;
  --text: 42rem;
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--sans);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.65;
  font-size: 1.05rem;
  text-rendering: optimizeLegibility;
}
img { max-width: 100%; height: auto; }
a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 0.18em; }
a:hover { text-decoration-thickness: 2px; }
.skip {
  position: absolute; left: 1rem; top: -4rem; background: var(--accent); color: var(--accent-ink);
  padding: 0.5rem 0.8rem; border-radius: 8px; z-index: 20;
}
.skip:focus { top: 1rem; }
.wrap { width: min(var(--max), calc(100% - 2rem)); margin-inline: auto; }
.site-header {
  background: var(--card);
  border-bottom: 1px solid var(--line);
  position: sticky; top: 0; z-index: 10;
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  min-height: 4.25rem;
}
.logo {
  font-weight: 750; letter-spacing: -0.03em; color: var(--ink); text-decoration: none;
  font-size: 1.05rem; line-height: 1.2;
}
.logo span { display: block; font-weight: 500; font-size: 0.72rem; color: var(--muted); letter-spacing: 0.04em; }
nav ul { display: flex; gap: 0.2rem 1.1rem; list-style: none; margin: 0; padding: 0; flex-wrap: wrap; }
nav a { color: var(--ink); text-decoration: none; font-size: 0.95rem; }
nav a[aria-current="page"] { font-weight: 700; }
.nav-toggle {
  display: none; background: transparent; border: 1px solid var(--line); border-radius: 10px;
  padding: 0.4rem 0.7rem; color: var(--ink); font: inherit;
}
.hero {
  background: var(--hero);
  color: var(--hero-ink);
  padding: 4.2rem 0 3.6rem;
}
.hero h1 {
  font-family: var(--serif);
  font-size: clamp(2rem, 4.5vw, 3.35rem);
  line-height: 1.12;
  letter-spacing: -0.03em;
  margin: 0 0 1rem;
  max-width: 18ch;
  font-weight: 650;
}
.hero p.lede {
  max-width: 40rem; font-size: 1.15rem; opacity: 0.92; margin: 0 0 1.6rem;
}
.btn {
  display: inline-flex; align-items: center; gap: 0.4rem;
  background: var(--accent); color: var(--accent-ink); text-decoration: none;
  padding: 0.75rem 1.1rem; border-radius: 999px; font-weight: 650;
}
.btn.secondary { background: transparent; color: inherit; border: 1px solid currentColor; }
.grid {
  display: grid; gap: 1.1rem;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}
.card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 1.25rem 1.3rem; box-shadow: var(--shadow);
}
.card h2, .card h3 { margin-top: 0; font-family: var(--serif); letter-spacing: -0.02em; }
.section { padding: 3rem 0; }
.section.alt { background: var(--bg-alt); }
.kicker {
  text-transform: uppercase; letter-spacing: 0.12em; font-size: 0.75rem; color: var(--muted);
  font-weight: 700; margin-bottom: 0.4rem;
}
.prose {
  max-width: var(--text);
  margin: 0 auto;
}
.prose h1 {
  font-family: var(--serif);
  font-size: clamp(1.9rem, 3.5vw, 2.7rem);
  line-height: 1.15; letter-spacing: -0.03em; margin: 0 0 0.7rem;
}
.prose h2 {
  font-family: var(--serif);
  font-size: 1.55rem; letter-spacing: -0.02em; margin: 2.2rem 0 0.7rem;
}
.prose h3 { font-size: 1.15rem; margin: 1.6rem 0 0.5rem; }
.prose p, .prose li { color: var(--ink); }
.prose .meta { color: var(--muted); font-size: 0.92rem; margin-bottom: 1.4rem; }
.prose table {
  width: 100%; border-collapse: collapse; font-size: 0.95rem; margin: 1.2rem 0 1.6rem;
  background: var(--card);
}
.prose th, .prose td {
  border: 1px solid var(--line); padding: 0.6rem 0.7rem; text-align: left; vertical-align: top;
}
.prose th { background: var(--bg-alt); }
.prose blockquote {
  margin: 1.4rem 0; padding: 0.2rem 0 0.2rem 1rem; border-left: 3px solid var(--accent);
  color: var(--muted);
}
.note, .warn {
  border-radius: var(--radius); padding: 1rem 1.1rem; margin: 1.3rem 0;
  border: 1px solid var(--line); background: var(--bg-alt);
}
.warn { border-color: #e4c48a; background: #fff8ea; }
.checklist { list-style: none; padding: 0; }
.checklist li {
  padding: 0.45rem 0 0.45rem 1.7rem; position: relative; border-bottom: 1px solid var(--line);
}
.checklist li::before { content: "✓"; position: absolute; left: 0; color: var(--ok); font-weight: 700; }
.ad-slot {
  margin: 1.8rem 0;
  border: 1px dashed #b9b3a9;
  background: repeating-linear-gradient(-45deg, #f3f0ea, #f3f0ea 8px, #efece5 8px, #efece5 16px);
  border-radius: 12px; padding: 1.3rem 1rem; text-align: center; color: #6b655c;
}
.ad-slot__label { font-size: 0.78rem; letter-spacing: 0.14em; text-transform: uppercase; margin: 0 0 0.3rem; font-weight: 700; }
.ad-slot__note { margin: 0; font-size: 0.9rem; }
.page-hero { padding: 2.4rem 0 1.2rem; }
.crumbs { font-size: 0.88rem; color: var(--muted); margin-bottom: 0.8rem; }
.crumbs a { color: inherit; }
.site-footer {
  border-top: 1px solid var(--line); background: var(--card); padding: 2.4rem 0 2rem;
  color: var(--muted); font-size: 0.92rem; margin-top: 2rem;
}
.footer-grid { display: grid; gap: 1.4rem; grid-template-columns: 2fr 1fr 1fr; }
.site-footer a { color: var(--ink); text-decoration: none; }
.site-footer ul { list-style: none; margin: 0.4rem 0 0; padding: 0; }
.site-footer li { margin: 0.25rem 0; }
form label { display: block; font-weight: 650; margin: 0.9rem 0 0.3rem; }
form input, form textarea, form select {
  width: 100%; max-width: 32rem; padding: 0.7rem 0.8rem; border-radius: 10px;
  border: 1px solid var(--line); font: inherit; background: var(--card); color: var(--ink);
}
form button {
  margin-top: 1rem; background: var(--accent); color: var(--accent-ink); border: 0;
  padding: 0.75rem 1.15rem; border-radius: 999px; font: inherit; font-weight: 700; cursor: pointer;
}
@media (max-width: 800px) {
  .nav-toggle { display: inline-flex; }
  .nav-panel {
    display: none; position: absolute; left: 0; right: 0; top: 100%;
    background: var(--card); border-bottom: 1px solid var(--line); padding: 0.8rem 1rem 1.1rem;
  }
  .nav-panel.is-open { display: block; }
  .nav-panel ul { flex-direction: column; gap: 0.7rem; }
  .footer-grid { grid-template-columns: 1fr; }
  .hero { padding: 2.6rem 0 2.2rem; }
  .prose table { display: block; overflow-x: auto; }
}