:root {
  --color-background: #ffffff;
  --color-surface: #f5f7f7;
  --color-text: #252b2e;
  --color-muted: #5b666b;
  --color-border: #d6dcde;
  --color-accent: #176b5b;
  --content-width: 64rem;
  --main-width: 64rem;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  color-scheme: light;
  scroll-behavior: auto;
}

body {
  min-width: 0;
  margin: 0;
  background: var(--color-background);
  color: var(--color-text);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 1rem;
  line-height: 1.75;
}

a {
  color: var(--color-accent);
  text-underline-offset: 0.2em;
}

a:hover {
  text-decoration-thickness: 0.12em;
}

:where(a, [tabindex]):focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 3px;
}

.skip-link {
  position: fixed;
  z-index: 10;
  top: 0.75rem;
  left: 0.75rem;
  padding: 0.65rem 0.9rem;
  background: var(--color-accent);
  color: #ffffff;
  font-weight: 700;
  transform: translateY(-180%);
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  border-bottom: 1px solid var(--color-border);
  background: var(--color-background);
}

.site-header__inner,
.site-footer__inner {
  width: min(100% - 2rem, var(--content-width));
  margin-inline: auto;
}

.site-header__inner {
  display: flex;
  align-items: center;
  gap: 2rem;
  padding-block: 0.65rem;
}

.site-name {
  margin: 0;
  font-size: 1.5rem;
  font-weight: 750;
  letter-spacing: 0.015em;
  line-height: 1.3;
}

.site-name a {
  color: var(--color-text);
  text-decoration: none;
}

.global-nav {
  margin-left: auto;
}

.global-nav ul,
.footer-nav ul {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.2rem 1.25rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.global-nav a,
.footer-nav a {
  display: inline-block;
  padding-block: 0.55rem;
  color: var(--color-text);
  font-weight: 650;
  text-decoration: underline;
  text-decoration-color: transparent;
}

.global-nav ul {
  flex-wrap: nowrap;
  justify-content: flex-end;
}

.global-nav a {
  white-space: nowrap;
}

.global-nav a:hover,
.footer-nav a:hover,
.global-nav a:focus-visible,
.footer-nav a:focus-visible {
  color: var(--color-accent);
  text-decoration-color: currentColor;
}

.global-nav a[aria-current="page"],
.footer-nav a[aria-current="page"] {
  color: var(--color-accent);
  text-decoration-color: currentColor;
}

.page-layout {
  width: min(100% - 2rem, var(--main-width));
  margin-inline: auto;
  padding-block: 2rem 3rem;
}

.main-content {
  width: 100%;
  max-width: var(--main-width);
  margin-inline: auto;
}

.main-content h1 {
  margin: 0 0 0.75rem;
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  line-height: 1.35;
  letter-spacing: 0.01em;
}

.page-introduction {
  margin: 0;
  color: var(--color-muted);
  font-size: 1.05rem;
}

.content-section {
  margin-top: 2rem;
  padding-top: 1.6rem;
  border-top: 1px solid var(--color-border);
}

.content-section h2 {
  margin: 0 0 0.7rem;
  color: var(--color-text);
  font-size: 1.4rem;
  line-height: 1.4;
}

.content-section p {
  margin: 0;
}

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

.content-list li + li {
  margin-top: 0.55rem;
}

.tool-list {
  margin: 0;
  padding: 0;
  border-bottom: 1px solid var(--color-border);
  list-style: none;
}

.tool-list li {
  padding-block: 1rem;
  border-top: 1px solid var(--color-border);
}

.tool-list h3 {
  margin: 0 0 0.35rem;
  font-size: 1.15rem;
  line-height: 1.45;
}

.tool-list p {
  margin: 0;
}

.site-footer {
  border-top: 1px solid var(--color-border);
  background: var(--color-surface);
}

.site-footer__inner {
  padding-block: 1.5rem;
}

.footer-nav a {
  font-size: 0.92rem;
  font-weight: 600;
}

.copyright {
  margin: 0.8rem 0 0;
  color: var(--color-muted);
}

@media (max-width: 48rem) {
  .site-header__inner {
    display: block;
  }

  .global-nav {
    margin: 0.4rem 0 0;
  }

  .global-nav ul {
    flex-wrap: wrap;
    justify-content: flex-start;
  }
}

@media (max-width: 27rem) {
  .site-header__inner,
  .site-footer__inner {
    width: min(100% - 1.5rem, var(--content-width));
  }

  .page-layout {
    width: min(100% - 1.5rem, var(--main-width));
  }

  .global-nav ul,
  .footer-nav ul {
    gap-inline: 1rem;
  }
}