:root {
  --ink: #1c1e21;
  --muted: #606770;
  --canvas: #f0f2f5;
  --surface: #fff;
  --line: #d8dde5;
  --blue: #1769d2;
  --blue-dark: #0e54ae;
  --blue-soft: #eaf2ff;
  --focus: #123d75;
}

*, *::before, *::after { box-sizing: border-box; }

html, body {
  width: 100%;
  min-height: 100%;
  margin: 0;
  overflow-x: hidden;
}

body {
  color: var(--ink);
  background: var(--canvas);
  font-family: "Segoe UI", Helvetica, Arial, system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a, button { -webkit-tap-highlight-color: transparent; touch-action: manipulation; }
button { font: inherit; }
[hidden] { display: none !important; }

.skip-link {
  position: fixed;
  z-index: 10;
  top: max(8px, env(safe-area-inset-top));
  left: max(8px, env(safe-area-inset-left));
  padding: 10px 13px;
  transform: translateY(-180%);
  border-radius: 9px;
  background: var(--ink);
  color: #fff;
  font-weight: 700;
  text-decoration: none;
}

.skip-link:focus { transform: translateY(0); }

.page {
  width: 100%;
  min-height: calc(100vh - 50px);
  min-height: calc(100dvh - 50px);
  display: grid;
  place-items: center;
  padding: max(16px, env(safe-area-inset-top)) max(16px, env(safe-area-inset-right)) 16px max(16px, env(safe-area-inset-left));
  outline: none;
}

.card {
  width: min(100%, 440px);
  padding: clamp(24px, 6vw, 34px);
  border: 1px solid var(--line);
  border-radius: 20px;
  background: var(--surface);
  box-shadow: 0 2px 4px rgba(28, 30, 33, .08), 0 18px 42px rgba(28, 30, 33, .1);
  text-align: center;
}

.logo-shell {
  width: clamp(78px, 22vw, 104px);
  height: clamp(78px, 22vw, 104px);
  margin: 0 auto 20px;
  padding: 8px;
  display: grid;
  place-items: center;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 23%;
  background: #fff;
}

.logo-shell img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
}

h1 {
  margin: 0;
  font-size: clamp(27px, 7.5vw, 34px);
  font-weight: 780;
  line-height: 1.1;
  letter-spacing: -.035em;
  overflow-wrap: anywhere;
  text-wrap: balance;
}

.description {
  max-width: 355px;
  margin: 13px auto 0;
  color: var(--muted);
  font-size: clamp(15px, 4.1vw, 17px);
  line-height: 1.48;
  overflow-wrap: anywhere;
  text-wrap: balance;
}

.primary-button {
  position: relative;
  width: 100%;
  min-height: 58px;
  margin-top: clamp(22px, 5vh, 30px);
  padding: 13px 52px 13px 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid transparent;
  border-radius: 13px;
  background: var(--blue);
  box-shadow: 0 9px 20px rgba(23, 105, 210, .24);
  color: #fff;
  cursor: pointer;
  font-size: clamp(16px, 4.5vw, 18px);
  font-weight: 780;
  line-height: 1.2;
  text-decoration: none;
  transition: background-color .15s ease, transform .15s ease, box-shadow .15s ease;
}

.primary-button:hover { background: var(--blue-dark); box-shadow: 0 11px 24px rgba(14, 84, 174, .28); }
.primary-button:active { transform: translateY(1px); }
.primary-button:focus-visible, footer:focus-visible { outline: 3px solid var(--focus); outline-offset: 3px; }

.primary-button svg {
  position: absolute;
  top: 50%;
  right: 18px;
  width: 22px;
  transform: translateY(-50%);
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.primary-button.busy { background: var(--blue-dark); }
.primary-button.busy svg { animation: nudge .7s ease-in-out infinite alternate; }
.primary-button.disabled, .primary-button:disabled { padding-right: 20px; background: #a6acb5; box-shadow: none; cursor: not-allowed; }

.note {
  max-width: 350px;
  margin: 12px auto 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.45;
  text-wrap: balance;
}

.destination {
  margin: 8px auto 0;
  color: #344052;
  font-size: 12px;
  font-weight: 720;
  line-height: 1.4;
  overflow-wrap: anywhere;
}

.destination span { color: var(--blue-dark); }

.facebook-help {
  width: 100%;
  margin-top: 14px;
  padding: 10px;
  border: 1px solid #bad1f3;
  border-radius: 11px;
  background: var(--blue-soft);
  color: #174a91;
  font-size: 12px;
  line-height: 1.4;
  text-align: left;
}

.facebook-help-title {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 9px;
  align-items: start;
}

.facebook-help-title > span {
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: #fff;
  font-weight: 850;
  letter-spacing: .08em;
}

.facebook-help p { margin: 0; }

.browser-options {
  margin-top: 10px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 7px;
}

.browser-options a {
  min-height: 39px;
  padding: 8px 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid #9ebfea;
  border-radius: 9px;
  background: #fff;
  color: #164f9d;
  font-weight: 760;
  line-height: 1.25;
  text-align: center;
  text-decoration: none;
}

.browser-options a:active { background: #f4f8ff; }
.browser-options a:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }
.browser-options .https-fallback { grid-column: 1 / -1; }

.facebook-help .manual-help {
  margin-top: 9px;
  color: #315981;
}

footer {
  min-height: 50px;
  padding: 13px max(16px, env(safe-area-inset-right)) max(13px, env(safe-area-inset-bottom)) max(16px, env(safe-area-inset-left));
  color: #6d7580;
  font-size: 12px;
  font-weight: 650;
  text-align: center;
}

@keyframes nudge { from { transform: translate(-2px, -50%); } to { transform: translate(2px, -50%); } }

@media (max-height: 590px) and (orientation: landscape) {
  .page { place-items: start center; }
  .card { padding: 20px 24px; }
  .logo-shell { width: 68px; height: 68px; margin-bottom: 12px; }
  .primary-button { margin-top: 17px; }
}

@media (max-width: 340px) {
  .page { padding-inline: 10px; }
  .card { padding: 22px 18px; border-radius: 16px; }
  .browser-options { grid-template-columns: 1fr; }
  .browser-options .https-fallback { grid-column: auto; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}