:root {
  --bg: #f6fbf6;
  --text: #1f3b2d;
  --muted: #527261;
  --accent: #2f855a;
  --surface: #ffffff;
  --border: #d7e7db;
  --content-width: 740px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
}

body {
  font-family: "Inter", "DM Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 17px;
  line-height: 1.75;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.2s ease, opacity 0.2s ease;
}

a:hover,
a:focus-visible {
  color: #276749;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(246, 251, 246, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}

.nav-container {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0.85rem 1.2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.site-title {
  font-family: "Space Grotesk", "Syne", sans-serif;
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--text);
}

.site-title:hover {
  color: var(--accent);
}

.menu-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 6px;
  font-size: 1rem;
  padding: 0.35rem 0.55rem;
  cursor: pointer;
}

.nav-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.nav-links a {
  color: var(--text);
  font-size: 0.93rem;
}

.nav-links a:hover,
.nav-links a:focus-visible,
.nav-links a.active {
  color: var(--accent);
}

main {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 4.2rem 1.2rem 5rem;
}

section {
  margin-bottom: 2.8rem;
}

h1,
h2,
h3 {
  font-family: "Space Grotesk", "Syne", sans-serif;
  line-height: 1.2;
  margin-top: 0;
  margin-bottom: 1rem;
  color: var(--accent);
}

h1 {
  font-size: clamp(2.15rem, 4.8vw, 3.3rem);
}

h2 {
  font-size: clamp(1.7rem, 3.4vw, 2.3rem);
}

p {
  margin: 0 0 1.2rem;
}

.hero-subheading {
  font-size: 1.15rem;
  color: var(--muted);
  margin-bottom: 1.8rem;
}

figure {
  margin: 2rem 0 2.4rem;
}

figure img {
  width: 100%;
  max-width: var(--content-width);
  height: auto;
  display: block;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--surface);
}

figcaption {
  margin-top: 0.55rem;
  color: var(--muted);
  font-style: italic;
  font-size: 13px;
  line-height: 1.5;
}

.callout {
  width: 100%;
  margin: 1.8rem 0 2rem;
  padding: 1rem 1.1rem;
  border-left: 4px solid var(--accent);
  background: rgba(47, 133, 90, 0.09);
  border-radius: 6px;
  font-weight: 600;
  color: #24543c;
}

.list-intro {
  margin-bottom: 0.8rem;
}

.content-list {
  margin: 0 0 1.4rem 1.2rem;
  padding: 0;
}

.content-list li {
  margin-bottom: 0.7rem;
}

.references-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.references-list li {
  margin-bottom: 1rem;
  padding-left: 1.4rem;
  text-indent: -1.4rem;
}

.site-footer {
  border-top: 1px solid var(--border);
  margin-top: 1.5rem;
}

.site-footer .footer-inner {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 1.5rem 1.2rem 2rem;
  color: var(--muted);
  font-size: 0.95rem;
}

@media (max-width: 980px) {
  .menu-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .nav-links {
    position: absolute;
    right: 1.2rem;
    top: calc(100% + 0.5rem);
    flex-direction: column;
    align-items: flex-start;
    gap: 0.3rem;
    width: min(88vw, 360px);
    background: #ffffff;
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 0.8rem;
    box-shadow: 0 12px 26px rgba(31, 59, 45, 0.16);
    display: none;
  }

  .nav-links.open {
    display: flex;
  }

  .nav-links a {
    display: block;
    padding: 0.35rem 0;
    width: 100%;
  }
}