:root {
  --ink: #1c2430;
  --muted: #5c6b7a;
  --paper: #f7f5f1;
  --paper-deep: #efe9df;
  --line: rgba(28, 36, 48, 0.12);
  --serif: 'Source Serif 4', Georgia, serif;
  --sans: 'DM Sans', 'Helvetica Neue', Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  color: var(--ink);
  font-family: var(--sans);
  background: var(--paper);
  position: relative;
}

.atmosphere {
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(ellipse 80% 50% at 50% -10%, rgba(28, 36, 48, 0.06), transparent 60%),
    linear-gradient(180deg, var(--paper) 0%, var(--paper-deep) 100%),
    repeating-linear-gradient(
      -12deg,
      transparent,
      transparent 18px,
      rgba(28, 36, 48, 0.015) 18px,
      rgba(28, 36, 48, 0.015) 19px
    );
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 5vw;
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(8px);
  background: rgba(247, 245, 241, 0.8);
}

.brand {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 1.25rem;
  color: var(--ink);
  text-decoration: none;
}

nav {
  display: flex;
  gap: 1rem;
  align-items: center;
}

nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
}

.cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.55rem 1rem;
  border-radius: 6px;
  border: 1px solid var(--line);
  color: var(--ink);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
}

.cta.primary {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}

.cta.ghost {
  background: transparent;
}

.hero {
  min-height: calc(100vh - 73px);
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 4rem 5vw 5rem;
  max-width: 52rem;
}

.brand-hero {
  margin: 0 0 1rem;
  font-family: var(--serif);
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1.05;
}

.hero h1 {
  margin: 0;
  font-family: var(--sans);
  font-size: clamp(1.15rem, 2.2vw, 1.45rem);
  font-weight: 500;
  color: var(--muted);
  letter-spacing: -0.01em;
}

.lede {
  margin: 1.25rem 0 0;
  max-width: 36rem;
  font-size: 1.05rem;
  line-height: 1.6;
  color: var(--muted);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 2rem;
}

@media (max-width: 640px) {
  .site-header {
    padding: 1rem 1.25rem;
  }

  .hero {
    padding: 3rem 1.25rem 4rem;
  }
}