:root {
  --bg: #faf9f6;
  --ink: #1a1a1a;
  --muted: #5c5c5c;
  --accent: #1f3a5f;
  --rule: #d8d5cd;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14161a;
    --ink: #e8e6e1;
    --muted: #a0a0a0;
    --accent: #8fb3dd;
    --rule: #2e3238;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: Georgia, "Times New Roman", serif;
  line-height: 1.6;
}

main {
  max-width: 38rem;
  margin: 0 auto;
  padding: 4rem 1.25rem 3rem;
}

header {
  border-bottom: 3px double var(--rule);
  padding-bottom: 1.5rem;
  margin-bottom: 2rem;
}

h1 {
  font-size: 2.4rem;
  margin: 0 0 0.5rem;
  letter-spacing: -0.01em;
}

.thesis {
  font-size: 1.15rem;
  color: var(--muted);
  margin: 0;
  font-style: italic;
}

h2 {
  font-size: 1.15rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin: 0 0 0.5rem;
}

.status {
  color: var(--muted);
  font-size: 0.95rem;
}

.signup {
  border-top: 1px solid var(--rule);
  margin-top: 2.5rem;
  padding-top: 2rem;
}

form {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-top: 1rem;
}

input[type="email"] {
  flex: 1 1 14rem;
  padding: 0.6rem 0.75rem;
  font-size: 1rem;
  font-family: inherit;
  border: 1px solid var(--rule);
  border-radius: 4px;
  background: var(--bg);
  color: var(--ink);
}

button {
  padding: 0.6rem 1.25rem;
  font-size: 1rem;
  font-family: inherit;
  border: none;
  border-radius: 4px;
  background: var(--accent);
  color: var(--bg);
  cursor: pointer;
}

button:hover { opacity: 0.9; }

footer {
  border-top: 1px solid var(--rule);
  margin-top: 3rem;
  padding-top: 1.5rem;
  font-size: 0.95rem;
}

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

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