:root {
  color-scheme: light;
  --paper: #fafafa;
  --ink: #292d26;
  --muted: #62675b;
  --line: #d9dccf;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; line-height: 1.6; -webkit-font-smoothing: antialiased; }
a { color: inherit; text-underline-offset: 0.2em; }
a:hover { text-decoration-thickness: 2px; }
a:focus-visible { outline: 3px solid var(--ink); outline-offset: 5px; border-radius: 2px; }
img { display: block; max-width: 100%; }
h1, h2, p { margin: 0; }
h1, h2 { line-height: 1.2; }
h1 { font-size: clamp(2rem, 6vw, 2.75rem); letter-spacing: -0.04em; }
h2 { font-size: 1.1rem; margin-bottom: 12px; }
.shell { display: flex; flex-direction: column; min-height: 100vh; min-height: 100svh; max-width: 720px; margin: 0 auto; padding: 0 24px; }
.skip-link { position: absolute; top: -100px; left: 1rem; background: var(--ink); color: white; padding: 0.5rem 1rem; }
.skip-link:focus { top: 1rem; }
.site-header { padding: 28px 0; }
.brand { display: inline-flex; gap: 10px; align-items: center; font-weight: 600; text-decoration: none; }
.brand img { border-radius: 8px; }
.landing { flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center; padding: 64px 0; }
.landing img { border-radius: 20px; margin-bottom: 24px; }
.landing > p { font-size: 1.2rem; margin-top: 12px; }
.landing > .platforms { color: var(--muted); font-size: 0.9rem; margin-top: 8px; }
.landing > .privacy-link { color: var(--muted); font-size: 0.9rem; margin-top: 24px; padding: 4px 0; }
.document { flex: 1; padding: 32px 0 64px; }
.document > p { margin-top: 16px; }
.document .updated { color: var(--muted); font-size: 0.85rem; margin-top: 8px; }
.document .intro { font-size: 1.2rem; font-weight: 600; margin-top: 32px; }
.document section { margin-top: 32px; }
.document section p + p { margin-top: 16px; }
.document a { overflow-wrap: anywhere; }
.invitation { flex: 1; padding: 32px 0 64px; }
.invitation-intro { font-size: 1.2rem; margin-top: 16px; color: var(--muted); }
.join-step { margin-top: 32px; }
.join-step p + p { margin-top: 12px; }
.action-link, .invitation-fallback button { display: inline-flex; justify-content: center; align-items: center; min-height: 48px; padding: 12px 20px; border: 1px solid var(--ink); border-radius: 12px; font: inherit; font-weight: 600; text-decoration: none; text-align: center; cursor: pointer; }
.primary-action { background: var(--ink); color: var(--paper); margin-top: 20px; }
.action-link:hover { opacity: 0.9; }
.action-help, .availability { color: var(--muted); font-size: 0.9rem; margin-top: 12px; }
.invitation-fallback { margin-top: 32px; border-top: 1px solid var(--line); padding-top: 20px; }
.invitation-fallback summary { cursor: pointer; padding: 8px 0; }
.invitation-fallback p { margin-top: 12px; }
.invitation-fallback label { display: block; margin-top: 20px; font-size: 0.9rem; }
.invitation-fallback input { display: block; width: 100%; min-width: 0; min-height: 48px; padding: 12px; margin-top: 8px; border: 1px solid var(--line); border-radius: 8px; background: white; color: var(--ink); font: inherit; }
.invitation-fallback button { background: var(--paper); color: var(--ink); margin-top: 12px; }
.invitation-fallback :is(button, input, summary):focus-visible { outline: 3px solid var(--ink); outline-offset: 4px; }
.invitation-error { margin-top: 24px; padding: 16px; border: 1px solid var(--line); border-radius: 12px; }
.site-footer { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 16px; border-top: 1px solid var(--line); padding: 20px 0 28px; color: var(--muted); font-size: 0.8rem; }
.site-footer nav { display: flex; gap: 20px; }
.site-footer a[aria-current="page"] { text-decoration: none; }

@media (max-width: 400px) {
  .shell { padding: 0 20px; }
  .site-header { padding: 20px 0; }
  .document { padding-top: 24px; }
  .invitation { padding-top: 24px; }
  .invitation .action-link { width: 100%; }
}

@media print {
  body { background: white; color: black; }
  .shell { max-width: none; min-height: auto; padding: 0; }
  .site-header, .site-footer, .skip-link { display: none; }
  .document { padding: 0; }
  .document section { break-inside: avoid; }
}