:root {
  --bg: #0c0e12;
  --bg-elev: #14171d;
  --ink: #e8ecf1;
  --ink-dim: #9aa3af;
  --ink-faint: #6b7280;
  --accent: #7cc4ff;
  --accent-hot: #a0d7ff;
  --line: #1f242d;
  --rule: #262c36;
  --radius: 10px;
  --max: 68rem;
  --serif: "Iowan Old Style", "Source Serif Pro", Georgia, "Times New Roman", serif;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

main {
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(2rem, 6vw, 5rem) clamp(1.25rem, 4vw, 2.5rem) 3rem;
}

/* Masthead */
.mast {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1.5rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--line);
  flex-wrap: wrap;
}
.wordmark {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
}
.mark {
  color: var(--accent);
  font-size: 1.4rem;
  transform: translateY(-1px);
}
.name {
  font-family: var(--serif);
  font-size: 1.6rem;
  letter-spacing: 0.01em;
  font-weight: 600;
}
.tagline {
  margin: 0;
  color: var(--ink-dim);
  font-size: 0.95rem;
  letter-spacing: 0.02em;
}

/* Lede */
.lede {
  padding: clamp(2.5rem, 7vw, 4.5rem) 0 clamp(2rem, 5vw, 3rem);
  border-bottom: 1px solid var(--line);
}
.lede h1 {
  font-family: var(--serif);
  font-size: clamp(2.1rem, 5.2vw, 3.4rem);
  line-height: 1.1;
  letter-spacing: -0.01em;
  margin: 0 0 1.25rem;
  max-width: 24ch;
  font-weight: 600;
}
.lede p {
  font-size: clamp(1.05rem, 1.5vw, 1.2rem);
  color: var(--ink-dim);
  max-width: 58ch;
  margin: 0;
}

/* Grid of plainly-titled sections */
.grid {
  display: grid;
  gap: clamp(1.25rem, 3vw, 2rem);
  grid-template-columns: repeat(auto-fit, minmax(17rem, 1fr));
  padding: clamp(2rem, 5vw, 3rem) 0;
  border-bottom: 1px solid var(--line);
}
.grid article h2 {
  font-family: var(--sans);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--ink-faint);
  margin: 0 0 0.6rem;
  font-weight: 600;
}
.grid article p {
  margin: 0;
  color: var(--ink);
  font-size: 1rem;
  max-width: 42ch;
}

/* CTA */
.cta {
  padding: clamp(2.5rem, 6vw, 4rem) 0 clamp(2rem, 5vw, 3rem);
}
.cta h2 {
  font-family: var(--serif);
  font-size: clamp(1.6rem, 3vw, 2.1rem);
  margin: 0 0 0.6rem;
  font-weight: 600;
  letter-spacing: -0.005em;
}
.cta p {
  margin: 0 0 1.5rem;
  color: var(--ink-dim);
  max-width: 52ch;
}

.signup {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
  max-width: 34rem;
}
.signup input[type="email"] {
  flex: 1 1 16rem;
  min-width: 0;
  background: var(--bg-elev);
  border: 1px solid var(--rule);
  color: var(--ink);
  padding: 0.85rem 1rem;
  font-size: 1rem;
  border-radius: var(--radius);
  font-family: inherit;
  transition: border-color 120ms ease, background 120ms ease;
}
.signup input[type="email"]::placeholder {
  color: var(--ink-faint);
}
.signup input[type="email"]:focus {
  outline: none;
  border-color: var(--accent);
  background: #161b22;
}
.signup button {
  background: var(--accent);
  color: #0b1220;
  border: 1px solid var(--accent);
  padding: 0.85rem 1.25rem;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius);
  cursor: pointer;
  font-family: inherit;
  transition: background 120ms ease, transform 80ms ease;
}
.signup button:hover { background: var(--accent-hot); border-color: var(--accent-hot); }
.signup button:active { transform: translateY(1px); }

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  margin: -1px; padding: 0; overflow: hidden;
  clip: rect(0 0 0 0); border: 0;
}

/* Footer */
footer {
  padding-top: 2rem;
  margin-top: 1rem;
  border-top: 1px solid var(--line);
  color: var(--ink-faint);
  font-size: 0.875rem;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}
footer a { color: var(--ink-dim); text-decoration: none; border-bottom: 1px solid var(--rule); }
footer a:hover { color: var(--ink); border-color: var(--ink-faint); }
footer p { margin: 0; }

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