/* Layout and type for the Project 5 site. The font itself comes from css/fonts.css. */
:root {
  --ink: #1b1b1b;
  --muted: #5c5a55;
  --paper: #fbfaf7;
  --white: #ffffff;
  --line: #d9d6cf;
  --accent: #1d4f7c;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: 'Ubuntu Mono', ui-monospace, monospace;
  font-size: 16px;
  line-height: 1.6;
}

.site-header,
main,
.site-footer {
  max-width: 52rem;
  margin: 0 auto;
  padding: 0 1.25rem;
}

.site-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.25rem 1.5rem;
  padding-top: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--line);
}

.brand {
  color: var(--ink);
  font-weight: 700;
  text-decoration: none;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
}

.site-nav a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 0.6rem;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 2px solid transparent;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  border-bottom-color: var(--accent);
}

.site-nav a[aria-current="page"] {
  font-weight: 700;
}

main {
  padding-top: 2rem;
  padding-bottom: 3rem;
}

h1 {
  margin: 0 0 1rem;
  font-size: 1.7rem;
  line-height: 1.25;
}

h2 {
  margin: 2.4rem 0 0.6rem;
  font-size: 1.2rem;
}

h3 {
  margin: 0 0 0.4rem;
  font-size: 1.05rem;
}

p {
  margin: 0 0 1rem;
}

a {
  color: var(--accent);
}

code {
  overflow-wrap: anywhere;
}

.eyebrow {
  margin-bottom: 0.4rem;
  color: var(--muted);
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.button {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  margin: 0 0.5rem 0.5rem 0;
  padding: 0.5rem 1rem;
  border: 1px solid var(--accent);
  background: var(--accent);
  color: var(--white);
  text-decoration: none;
}

.button-quiet {
  background: transparent;
  color: var(--accent);
}

.link-list,
.plain {
  padding-left: 1.2rem;
}

.link-list li,
.plain li {
  margin-bottom: 0.6rem;
  overflow-wrap: anywhere;
}

.diagram {
  margin: 2rem 0;
  overflow-x: auto;
}

.diagram img {
  display: block;
  width: 100%;
  min-width: 720px;
  height: auto;
  border: 1px solid var(--line);
  background: var(--white);
}

.diagram figcaption {
  margin-top: 0.5rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.terms dt {
  margin-top: 0.9rem;
  font-weight: 700;
}

.terms dd {
  margin: 0.2rem 0 0;
}

.agent-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.agent-buttons button {
  min-height: 44px;
  padding: 0.4rem 0.9rem;
  border: 1px solid var(--ink);
  background: var(--white);
  color: var(--ink);
  font: inherit;
  cursor: pointer;
}

.agent-buttons button[aria-pressed="true"] {
  background: var(--ink);
  color: var(--white);
}

.agent-panel {
  padding-top: 1rem;
  border-top: 1px solid var(--line);
}

.agent-panel dt {
  margin-top: 0.7rem;
  font-weight: 700;
}

.agent-panel dd {
  margin: 0.1rem 0 0;
}

.skip-link {
  position: absolute;
  left: -999px;
}

.skip-link:focus {
  left: 1rem;
  top: 1rem;
  padding: 0.4rem 0.6rem;
  border: 1px solid var(--ink);
  background: var(--white);
}

a:focus-visible,
button:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
}

.site-footer {
  padding-top: 1rem;
  padding-bottom: 2rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.9rem;
}