:root {
  --ink: #16181d;
  --muted: #5d6270;
  --paper: #fbfaf7;
  --line: #d9d5cc;
  --accent: #7a1f1f;
  --go: #1e7a4a;
  --go-dark: #155c37;
  --error: #b42318;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 18px;
  line-height: 1.55;
}

/* Header with logo, top left */
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  border-bottom: 1px solid rgba(22, 24, 29, .14);
}

.admin-link {
  display: none;
  font-family: var(--sans);
  font-size: .8rem;
  font-weight: 600;
  letter-spacing: .02em;
  color: var(--ink);
  text-decoration: none;
  padding: .4rem 0;
  border-bottom: 1px solid transparent;
}

html.is-admin .admin-link { display: inline-block; }

.admin-link:hover,
.admin-link:focus-visible { border-bottom-color: var(--ink); outline: none; }

.logo-link { display: inline-block; line-height: 0; }

.logo {
  height: 40px;
  width: auto;
}

@media (min-width: 720px) {
  .site-header { padding: 1.25rem 2.5rem; }
  .logo { height: 52px; }
}

.wrap {
  flex: 1;
  width: 100%;
  max-width: 34rem;
  margin: 0 auto;
  padding: 2.5rem 1.5rem 2.5rem;
}

h1 {
  margin: 0;
  font-weight: 400;
  font-size: clamp(2.1rem, 8vw, 2.9rem);
  line-height: 1.1;
  letter-spacing: -.01em;
}

h2 {
  margin: 0 0 .5rem;
  font-weight: 400;
  font-size: 1.6rem;
}

.rule {
  width: 3rem;
  height: 2px;
  margin: 1.5rem 0 1.75rem;
  background: rgba(22, 24, 29, .14);
}

.intro p { margin: 0 0 1rem; }

/* Form */
.signup {
  margin-top: 1.25rem;
  display: flex;
  flex-direction: column;
}

.field { display: flex; flex-direction: column; }

label {
  margin: 1rem 0 .35rem;
  font-family: var(--sans);
  font-size: .85rem;
  font-weight: 600;
  color: var(--ink);
}

.req { color: var(--error); font-weight: 700; }

.opt { font-weight: 400; color: var(--muted); }

input {
  width: 100%;
  padding: .85rem .9rem;
  font: 16px/1.3 var(--sans); /* 16px stops iOS from zooming on focus */
  color: var(--ink);
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 6px;
  appearance: none;
}

input:focus {
  outline: none;
  border-color: var(--ink);
  box-shadow: 0 0 0 3px rgba(22, 24, 29, .12);
}

input.invalid {
  border-color: var(--error);
  background: #fffafa;
}

input.invalid:focus { box-shadow: 0 0 0 3px rgba(180, 35, 24, .15); }

.error {
  margin: .35rem 0 0;
  font-family: var(--sans);
  font-size: .8rem;
  color: var(--error);
}

.error:empty { display: none; }

.form-alert {
  display: none;
  margin: 1.5rem 0 0;
  padding: .75rem .9rem;
  font-family: var(--sans);
  font-size: .85rem;
  font-weight: 600;
  color: var(--error);
  background: #fef3f2;
  border: 1px solid #fecdca;
  border-radius: 6px;
}

.form-alert.show { display: block; }

button {
  margin-top: 1.5rem;
  padding: 1rem;
  font: 600 1rem var(--sans);
  letter-spacing: .02em;
  color: #fff;
  background: var(--ink);
  border: 0;
  border-radius: 6px;
  cursor: pointer;
  transition: background-color .15s ease, transform .05s ease;
}

button:hover,
button:focus-visible { background: var(--go); }

button:active,
button.sent {
  background: var(--go-dark);
  transform: translateY(1px);
}

.fine {
  margin: 1rem 0 0;
  font-family: var(--sans);
  font-size: .78rem;
  line-height: 1.5;
  color: var(--muted);
}

.hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }

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

footer {
  padding: 1.5rem;
  text-align: center;
  font-family: var(--sans);
  font-size: .75rem;
  color: var(--muted);
  border-top: 1px solid var(--line);
}

footer p { margin: 0; }