/*
  Copper & Slate — the same palette the book's PDF template uses, so the page
  and the thing it hands you look like they came from the same place.

  System font stack rather than a webfont: the page loads one external script
  (Turnstile) and nothing else. No font CDN means no third-party request on a
  page whose whole job is to be trusted with an email address.
*/

:root {
  --copper: #B87333;
  --copper-dark: #A2632C;
  --darkslate: #1E293B;
  --slate: #334155;
  --muted: #94A3B8;
  --coolgray: #F1F5F9;
  --border: #CBD5E1;
  --amber: #D97706;
  --lightamber: #FFFBEB;
  --page: #FFFFFF;
  --card: #FFFFFF;

  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --measure: 34rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --darkslate: #F1F5F9;
    --slate: #CBD5E1;
    --muted: #94A3B8;
    --coolgray: #0F172A;
    --border: #334155;
    --page: #0F172A;
    --card: #1E293B;
    --lightamber: rgba(217, 119, 6, 0.10);
  }
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--page);
  color: var(--slate);
  font: 400 17px/1.65 var(--sans);
  -webkit-font-smoothing: antialiased;
}

.rule {
  height: 4px;
  background: var(--copper);
}

main {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 0 20px 72px;
}

h1, h2 {
  color: var(--darkslate);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.15;
}

/* ---------- hero ---------- */

.hero { padding: 64px 0 8px; }

.eyebrow {
  margin: 0 0 20px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--copper);
}

h1 {
  margin: 0 0 24px;
  font-size: clamp(2.25rem, 7vw, 3.25rem);
}

.lede {
  margin: 0 0 16px;
  font-size: 1.15rem;
  line-height: 1.6;
  color: var(--slate);
}

.lede-sub {
  margin: 0 0 8px;
  color: var(--muted);
}

/* ---------- signup ---------- */

.signup {
  margin: 44px 0 0;
  padding: 28px 26px 24px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  box-shadow: 0 1px 3px rgba(30, 41, 59, 0.06);
}

.signup h2 {
  margin: 0 0 6px;
  font-size: 1.4rem;
}

.signup-note {
  margin: 0 0 20px;
  color: var(--muted);
  font-size: 0.95rem;
}

label {
  display: block;
  margin-bottom: 7px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--darkslate);
}

.field {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

input[type="email"] {
  flex: 1 1 15rem;
  min-width: 0;
  padding: 12px 14px;
  font: 400 16px/1.4 var(--sans);
  color: var(--darkslate);
  background: var(--page);
  border: 1px solid var(--border);
  border-radius: 6px;
}

input[type="email"]::placeholder { color: var(--muted); }

input[type="email"]:focus-visible,
button:focus-visible,
a:focus-visible {
  outline: 2px solid var(--copper);
  outline-offset: 2px;
}

button {
  flex: 0 0 auto;
  padding: 12px 22px;
  font: 600 16px/1.4 var(--sans);
  color: #fff;
  background: var(--copper);
  border: 1px solid var(--copper);
  border-radius: 6px;
  cursor: pointer;
}

button:hover:not(:disabled) { background: var(--copper-dark); border-color: var(--copper-dark); }
button:disabled { opacity: 0.6; cursor: default; }

.turnstile { margin: 16px 0 0; min-height: 65px; }

.status {
  margin: 12px 0 0;
  font-size: 0.9rem;
  min-height: 1.3em;
}

.status.error { color: var(--amber); }

.done { padding: 4px 0; }
.done-h {
  margin: 0 0 10px;
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--darkslate);
}
.done p { margin: 0 0 10px; }
.done-note { color: var(--muted); font-size: 0.9rem; margin: 0; }

.privacy {
  margin: 20px 0 0;
  padding-top: 18px;
  border-top: 1px solid var(--border);
  font-size: 0.88rem;
  color: var(--muted);
}

/* ---------- contents ---------- */

.contents { margin: 56px 0 0; }

.contents h2 {
  margin: 0 0 22px;
  font-size: 1.4rem;
}

.parts {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 22px;
}

.parts li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 4px 14px;
  align-items: baseline;
}

.pn {
  grid-row: 1;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--copper);
  white-space: nowrap;
  padding-top: 2px;
}

.pt {
  grid-row: 1;
  font-size: 1.02rem;
  font-weight: 600;
  color: var(--darkslate);
}

.pd {
  grid-row: 2;
  grid-column: 2;
  color: var(--muted);
  font-size: 0.95rem;
}

.appendices {
  margin: 26px 0 0;
  padding-top: 18px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.95rem;
}

/* ---------- honest note ---------- */

.honest {
  margin: 52px 0 0;
  padding: 24px 24px 20px;
  background: var(--lightamber);
  border-left: 3px solid var(--amber);
  border-radius: 0 8px 8px 0;
}

.honest h2 {
  margin: 0 0 12px;
  font-size: 1.15rem;
}

.honest p {
  margin: 0 0 12px;
  font-size: 0.95rem;
}

.honest-sub {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

/* ---------- footer ---------- */

footer {
  margin: 52px 0 0;
  padding-top: 22px;
  border-top: 1px solid var(--border);
}

footer p {
  margin: 0;
  color: var(--muted);
  font-size: 0.85rem;
}

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

@media (max-width: 30rem) {
  main { padding-bottom: 56px; }
  .hero { padding-top: 44px; }
  .signup { padding: 22px 18px 20px; }
  button { flex: 1 1 100%; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}