:root {
  --paper: #f8f6ef;
  --ink: #1d2a21;
  --green: #007109;        /* August's artwork green */
  --green-deep: #004f06;
  --rule: #cfd6c8;
  --muted: #4a5a4e;
  --measure: 38rem;
}

* { box-sizing: border-box; }

html { background: var(--paper); color: var(--ink); }

body {
  margin: 0;
  font-family: "Source Serif 4", Georgia, "Times New Roman", serif;
  font-size: 1.125rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--green); }
a:focus-visible, .button:focus-visible { outline: 3px solid var(--green); outline-offset: 3px; }

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  margin: -1px; padding: 0;
  overflow: hidden; clip: rect(0 0 0 0);
  white-space: nowrap; border: 0;
}

/* Full-width green band; the artwork's own green dissolves into it */
.masthead {
  background: var(--green);
  padding: clamp(1.5rem, 5vw, 3rem) 0;
  text-align: center;
}
.masthead-art {
  display: block;
  width: min(20rem, 100% - 2.5rem);
  height: auto;
  margin: 0 auto;
}

main, footer {
  width: min(var(--measure), 100% - 2.5rem);
  margin-inline: auto;
}

main { padding-block: 3rem; }

h2 {
  margin: 0 0 1rem;
  font-size: 1.5rem;
  font-weight: 600;
  line-height: 1.25;
  color: var(--green-deep);
}
p { margin: 0 0 1rem; }
p:last-child { margin-bottom: 0; }

.notice { padding-bottom: 2.5rem; }

.sign {
  padding-top: 2.5rem;
  border-top: 1px solid var(--rule);
}
.button {
  display: inline-block;
  padding: .85em 1.6em;
  background: var(--green);
  color: #fff;
  text-decoration: none;
  font-weight: 600;
  font-size: 1.125rem;
  border-radius: 4px;
}
.button:hover { background: var(--green-deep); }
.sign-note {
  margin-top: 1rem;
  font-size: 1rem;
  color: var(--muted);
}

footer {
  padding-block: 2rem 3rem;
  border-top: 1px solid var(--rule);
  font-size: .95rem;
  color: var(--muted);
}

@media (max-width: 480px) {
  .button { display: block; text-align: center; }
}