:root {
  --cream: #faf7f2;
  --ink: #1a1a1a;
  --muted: #6b6660;
  --rule: #e3dcd2;
  --link: #3a4a6b;
  --serif: 'Fraunces', Georgia, 'Times New Roman', serif;
  --body: Georgia, 'Iowan Old Style', 'Times New Roman', serif;
  --sans: 'Inter', system-ui, -apple-system, sans-serif;
}

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  background: var(--cream);
  color: var(--ink);
  font-family: var(--body);
  line-height: 1.6;
  font-size: 18px;
}

main {
  max-width: 640px;
  margin: 0 auto;
  padding: 0 24px 64px;
}

.kicker {
  font-family: var(--sans);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 12px;
}

/* wordmark */
/* Sticky wordmark header — stays visible while scrolling. */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--ink);
  color: var(--cream);
  box-shadow: 0 1px 6px rgba(26, 22, 18, 0.18);
}
.site-header-inner {
  max-width: 640px;
  margin: 0 auto;
  padding: 14px 24px;
  font-family: var(--serif);
  font-weight: 600;
  font-size: 21px;
  letter-spacing: -0.01em;
  text-align: center;
}
.site-header a {
  color: inherit;
  text-decoration: none;
}

/* hero */
.hero h1 {
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(30px, 6vw, 44px);
  line-height: 1.12;
  letter-spacing: -0.02em;
  margin: 32px 0 16px;
}
.subhead {
  font-size: 19px;
  color: #38332e;
  margin: 0 0 28px;
}

/* signup */
.signup {
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-width: 420px;
}
.signup input[type='email'] {
  font-family: var(--body);
  font-size: 17px;
  padding: 14px 16px;
  border: 1px solid var(--rule);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
}
.signup input[type='email']:focus {
  outline: 2px solid var(--link);
  outline-offset: 1px;
}
.signup button {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 17px;
  padding: 14px 18px;
  border: none;
  border-radius: 8px;
  background: var(--ink);
  color: var(--cream);
  cursor: pointer;
  transition: opacity 0.15s ease;
}
.signup button:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}
.cf-turnstile {
  min-height: 0;
}
.status {
  margin: 0;
  font-size: 15px;
  min-height: 1.4em;
}
.status.ok {
  color: #3d5a40;
}
.status.err {
  color: #7a3b2e;
}
.privacy-note {
  font-family: var(--sans);
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--muted);
  max-width: 460px;
  margin: 18px 0 0;
}
.privacy-note a {
  color: var(--link);
}

/* masthead */
.masthead {
  font-family: var(--serif);
  font-size: 15px;
  color: var(--muted);
  text-align: center;
  margin: 52px 0;
  padding: 22px 0;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  line-height: 1.9;
}

/* sample lesson */
.letter {
  background: #fffdf9;
  border: 1px solid var(--rule);
  border-radius: 10px;
  padding: 28px;
}
.letter h2 {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 24px;
  margin: 0 0 14px;
}
.letter-body p {
  margin: 0 0 14px;
}
.letter-body em {
  color: #333;
}

/* shelf */
.shelf-section {
  margin: 56px 0;
  /* Break out wider than the 640px reading column so the whole shelf is visible. */
  width: min(96vw, 980px);
  margin-left: 50%;
  transform: translateX(-50%);
}
.shelf {
  /* Responsive grid that wraps — never scrolls horizontally. */
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
  gap: 16px;
}
.shelf .cover {
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 3;
  border-radius: 4px;
  box-shadow: 0 6px 18px rgba(26, 22, 18, 0.18);
  object-fit: cover;
  background: #fff;
}

/* library */
.library {
  margin: 64px 0;
}
.library-title {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 26px;
  letter-spacing: -0.01em;
  margin: 4px 0 24px;
}
.library-groups {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 28px 32px;
}
.library-group h3 {
  font-family: var(--sans);
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin: 0 0 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--rule);
}
.library-group ul {
  list-style: none;
  margin: 0;
  padding: 0;
}
.library-group li {
  margin-bottom: 12px;
}
.library-group li strong {
  display: block;
  font-family: var(--serif);
  font-weight: 600;
  font-size: 16px;
  line-height: 1.3;
}
.library-group li span {
  font-family: var(--sans);
  font-size: 13px;
  color: var(--muted);
}

/* faq */
.faq {
  margin: 56px 0;
}
.faq h2 {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 26px;
  margin: 0 0 18px;
}
.faq details {
  border-bottom: 1px solid var(--rule);
  padding: 14px 0;
}
.faq summary {
  font-family: var(--serif);
  font-size: 18px;
  cursor: pointer;
  list-style: none;
}
.faq summary::-webkit-details-marker {
  display: none;
}
.faq summary::before {
  content: '+ ';
  color: var(--muted);
}
.faq details[open] summary::before {
  content: '– ';
}
.faq details p {
  margin: 10px 0 2px;
  color: #38332e;
  font-size: 17px;
}

/* footer */
.footer {
  font-family: var(--sans);
  font-size: 14px;
  color: var(--muted);
  text-align: center;
  padding-top: 32px;
  border-top: 1px solid var(--rule);
}
.footer a {
  color: var(--link);
}
.footer .copy {
  margin-top: 8px;
  font-size: 13px;
}