:root {
  --paper: #f1efe8;
  --ink: #1d1e1b;
  --muted: rgba(29, 30, 27, 0.62);
  --line: rgba(29, 30, 27, 0.42);
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, Baskerville, Georgia, serif;
  --sans: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
}

* { box-sizing: border-box; }
html { background: var(--paper); color: var(--ink); }
body {
  margin: 0;
  min-height: 100vh;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: inherit; text-decoration: none; }

.page-shell {
  min-height: 100vh;
  padding: 28px clamp(24px, 4vw, 64px) 24px;
  display: grid;
  grid-template-rows: auto 1fr auto;
  gap: 28px;
}

.site-header,
.footer-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.masthead {
  font-size: 13px;
  letter-spacing: 0.12em;
  font-weight: 600;
  white-space: nowrap;
}

.social-nav {
  display: flex;
  gap: 18px;
  font-size: 12px;
  letter-spacing: 0.08em;
}
.social-nav a,
.masthead { transition: opacity 160ms ease; }
.social-nav a:hover,
.masthead:hover { opacity: 0.58; }

.hero-grid {
  align-self: center;
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(360px, 0.78fr);
  gap: clamp(52px, 7vw, 120px);
  align-items: center;
  width: 100%;
}

.hero-copy {
  min-width: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: clamp(56px, 8vh, 96px);
  padding-left: clamp(0px, 3vw, 48px);
}

h1 {
  margin: 0;
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(56px, 6.2vw, 88px);
  line-height: 0.98;
  letter-spacing: -0.045em;
  max-width: 11.5ch;
}

.definition {
  margin: 28px 0 0;
  max-width: 33ch;
  font-size: 16px;
  line-height: 1.55;
  color: var(--muted);
}
.definition-term { color: var(--ink); }

.signup { max-width: 470px; }
.signup-label {
  display: block;
  margin-bottom: 14px;
  font-size: 11px;
  letter-spacing: 0.12em;
  font-weight: 600;
}
.signup-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
  border-bottom: 1px solid var(--line);
  transition: border-color 160ms ease;
}
.signup-row:focus-within { border-color: var(--ink); }
.signup input {
  width: 100%;
  padding: 12px 0 11px;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--ink);
  font: inherit;
  font-size: 15px;
}
.signup input::placeholder { color: rgba(29, 30, 27, 0.48); }
.signup button {
  border: 0;
  background: transparent;
  color: var(--ink);
  font-size: 24px;
  line-height: 1;
  padding: 6px 0 4px 12px;
  cursor: pointer;
  transform: translateX(0);
  transition: transform 160ms ease, opacity 160ms ease;
}
.signup button:hover { transform: translateX(3px); opacity: 0.7; }
.signup-status {
  min-height: 18px;
  margin: 10px 0 0;
  font-size: 12px;
  color: var(--muted);
}

.film-frame {
  margin: 0;
  width: min(43vw, 620px);
  aspect-ratio: 4 / 3;
  justify-self: end;
  overflow: hidden;
  background: #d7d4cc;
}
.film-frame video {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
  object-position: center center;
  filter: saturate(0.9) contrast(0.98);
}

.site-footer {
  display: grid;
  gap: 16px;
}
.principles {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.015em;
  color: rgba(29, 30, 27, 0.75);
}
.principles span { margin: 0 0.45em; color: rgba(29, 30, 27, 0.36); }
.disclosure,
.copyright {
  margin: 0;
  font-size: 11px;
  line-height: 1.4;
  color: rgba(29, 30, 27, 0.58);
}

@media (max-width: 900px) {
  .page-shell {
    min-height: auto;
    padding: 22px 20px 28px;
    gap: 36px;
  }

  .site-header { align-items: flex-start; }
  .social-nav { display: none; }

  .hero-grid {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 44px;
  }

  .hero-copy {
    padding-left: 0;
    gap: 44px;
  }

  h1 {
    font-size: clamp(50px, 15.3vw, 76px);
    line-height: 0.96;
    max-width: 11.5ch;
  }

  .definition {
    margin-top: 22px;
    font-size: 15px;
    max-width: 28ch;
  }

  .film-frame {
    width: 100%;
    align-self: flex-end;
    aspect-ratio: 4 / 3;
  }

  .signup {
    order: 2;
    max-width: none;
  }

  .site-footer { gap: 22px; }
  .principles {
    max-width: 29ch;
    line-height: 1.8;
  }

  .footer-row {
    align-items: flex-end;
  }
  .disclosure { max-width: 27ch; }
}

@media (max-width: 520px) {
  .page-shell { padding-top: 20px; }
  .masthead { font-size: 12px; }
  .film-frame { width: 100%; }
  .signup-row { gap: 8px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    scroll-behavior: auto !important;
    transition: none !important;
  }
  .film-frame video { animation: none; }
}