:root {
  --bg: #FAFAF7;
  --text: #1A1A1A;
  --muted: #5A5A5A;
  --accent: #1F4E4A;
  --accent-dark: #163834;
  --accent-soft: rgba(31, 78, 74, 0.08);
  --border: #E5E3DC;
  --card-bg: #FFFFFF;
}

*, *::before, *::after { box-sizing: border-box; }

html {
  font-size: 17px;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.55;
  font-feature-settings: "kern" 1, "liga" 0, "clig" 0, "dlig" 0, "hlig" 0;
  font-variant-ligatures: none;
  -webkit-font-smoothing: antialiased;
}

main {
  max-width: 640px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Hero */
.hero {
  padding: 6rem 0 4rem;
}

.wordmark {
  display: block;
  width: 320px;
  height: auto;
  max-width: 100%;
  margin: 0 0 3.5rem;
}

h1 {
  font-family: "Newsreader", Georgia, serif;
  font-weight: 500;
  font-size: 2.4rem;
  line-height: 1.15;
  letter-spacing: -0.015em;
  margin: 0 0 1.5rem;
}

.hero-sub {
  font-size: 1.15rem;
  line-height: 1.55;
  color: var(--muted);
  margin: 0 0 2rem;
  max-width: 32em;
}

.cta {
  display: inline-block;
  background: var(--accent);
  color: var(--bg);
  text-decoration: none;
  padding: 0.85rem 1.5rem;
  font-weight: 500;
  font-size: 1rem;
  border-radius: 2px;
  transition: background 0.15s ease;
}

.cta:hover, .cta:focus-visible {
  background: var(--accent-dark);
  outline: none;
}

/* Thesis */
.thesis {
  padding: 3rem 0;
  border-top: 1px solid var(--border);
}

.lede {
  font-family: "Newsreader", Georgia, serif;
  font-size: 1.5rem;
  font-weight: 400;
  line-height: 1.3;
  letter-spacing: -0.01em;
  margin: 0 0 1.5rem;
}

.thesis p { margin: 0 0 1.25rem; }

.emphasis {
  font-family: "Newsreader", Georgia, serif;
  font-size: 1.2rem;
  font-style: italic;
  color: var(--accent);
  margin-top: 2rem !important;
}

/* Resource cards */
.resource { padding: 1rem 0; }

.resource-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  padding: 2rem;
  border-radius: 4px;
}

.status {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 0.25rem 0.6rem;
  border-radius: 2px;
  margin-bottom: 1rem;
}

.resource-card h2 {
  font-family: "Newsreader", Georgia, serif;
  font-weight: 500;
  font-size: 1.35rem;
  line-height: 1.25;
  margin: 0 0 0.75rem;
  letter-spacing: -0.005em;
}

.resource-card p {
  margin: 0;
  color: var(--muted);
}

/* Signup */
.signup {
  padding: 5rem 0 4rem;
  border-top: 1px solid var(--border);
  margin-top: 3rem;
}

.signup h2 {
  font-family: "Newsreader", Georgia, serif;
  font-weight: 500;
  font-size: 2rem;
  margin: 0 0 0.75rem;
  letter-spacing: -0.01em;
}

.signup-sub {
  color: var(--muted);
  margin: 0 0 2rem;
  font-size: 1.05rem;
}

.signup-form {
  display: flex;
  gap: 0.5rem;
  max-width: 480px;
  margin: 0 0 1rem;
}

.signup-form input[type="email"] {
  flex: 1;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border);
  background: var(--card-bg);
  border-radius: 2px;
  font: inherit;
  font-size: 1rem;
  color: var(--text);
}

.signup-form input[type="email"]:focus {
  outline: 2px solid var(--accent);
  outline-offset: -1px;
  border-color: var(--accent);
}

.signup-form button {
  background: var(--accent);
  color: var(--bg);
  border: none;
  padding: 0.75rem 1.25rem;
  font: inherit;
  font-weight: 500;
  font-size: 1rem;
  border-radius: 2px;
  cursor: pointer;
  transition: background 0.15s ease;
}

.signup-form button:hover, .signup-form button:focus-visible {
  background: var(--accent-dark);
  outline: none;
}

.signup-note {
  font-size: 0.9rem;
  color: var(--muted);
  margin: 1.5rem 0 0;
  font-style: italic;
}

/* About */
.about {
  padding: 4rem 0;
  border-top: 1px solid var(--border);
}

.about h2 {
  font-family: "Newsreader", Georgia, serif;
  font-weight: 500;
  font-size: 1.5rem;
  margin: 0 0 1.5rem;
  letter-spacing: -0.005em;
}

.about p {
  margin: 0 0 1.25rem;
}

/* Footer */
footer {
  padding: 3rem 0 4rem;
  border-top: 1px solid var(--border);
  font-size: 0.95rem;
}

footer p { margin: 0 0 0.5rem; }

footer a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
  padding-bottom: 1px;
}

footer a:hover, footer a:focus-visible {
  color: var(--accent-dark);
  outline: none;
}

.copyright {
  color: var(--muted);
  font-size: 0.85rem;
  margin-top: 1rem !important;
}

/* Utility */
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

/* Mobile */
@media (max-width: 600px) {
  html { font-size: 16px; }
  .hero { padding: 4rem 0 3rem; }
  .wordmark { margin-bottom: 2.5rem; }
  h1 { font-size: 1.85rem; }
  .hero-sub { font-size: 1.05rem; }
  .lede { font-size: 1.25rem; }
  .resource-card { padding: 1.5rem; }
  .signup { padding: 3.5rem 0 3rem; }
  .signup h2 { font-size: 1.65rem; }
  .signup-form {
    flex-direction: column;
  }
  .signup-form button { width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}