.page-shell {
  min-height: 100vh;
  background: var(--bg-app);
}

.page-header,
.page-main,
.page-footer {
  max-width: 820px;
  margin: 0 auto;
  padding-left: clamp(20px, 5vw, 56px);
  padding-right: clamp(20px, 5vw, 56px);
}

.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding-top: 20px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-soft);
}

.page-brand {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 22px;
  letter-spacing: -0.03em;
  color: var(--text-display);
  text-decoration: none;
}

.page-brand span {
  color: var(--terra-3);
}

.page-nav {
  display: flex;
  gap: 18px;
  font-size: 14px;
}

.page-nav a {
  color: var(--text-muted);
  text-decoration: none;
}

.page-nav a:hover {
  color: var(--text-display);
}

.page-main {
  padding-top: 48px;
  padding-bottom: 64px;
}

.page-main h1 {
  font-size: clamp(32px, 4vw, 48px);
  margin-bottom: 16px;
}

.page-main p,
.page-main li {
  font-size: 17px;
  line-height: 1.65;
  color: var(--text-body);
}

.page-main ul {
  padding-left: 20px;
}

.page-footer {
  padding-bottom: 32px;
  color: var(--text-faint);
  font-size: 13px;
}

.thanks-card {
  max-width: 520px;
  padding: 28px;
  border-radius: var(--radius-md);
  background: var(--surface-card);
  border: 1px solid var(--border-soft);
  box-shadow: var(--shadow-clay-inset), var(--shadow-sm);
}

.error-shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
  background: var(--surface-ink);
  color: var(--clay-2);
  text-align: center;
}

.error-shell h1 {
  color: #fffdf8;
  font-size: clamp(40px, 6vw, 72px);
  margin-bottom: 12px;
}

.error-shell .glitch {
  color: var(--glitch-green);
}

.error-shell p {
  max-width: 520px;
  margin: 0 auto 24px;
  line-height: 1.6;
  color: var(--clay-3);
}