:root {
  --bg: #e8eaed;
  --card: #ffffff;
  --ink: #202124;
  --muted: #5f6368;
  --line: #dadce0;
  --btn: #3c4043;
  --btn-ink: #ffffff;
  --danger: #c5221f;
  --radius: 32px;
  --shadow: 0 1px 2px rgba(60, 64, 67, 0.08), 0 8px 24px rgba(60, 64, 67, 0.12);
  font-family: Inter, "Noto Sans SC", "Noto Sans TC", "Noto Sans JP", "Noto Sans KR", system-ui, sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; background: var(--bg); color: var(--ink); }
body { min-height: 100dvh; }
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); border: 0;
}

.page {
  max-width: 760px;
  margin: 0 auto;
  padding: 20px 20px 64px;
}

.top { display: flex; justify-content: flex-end; margin-bottom: 12px; }
.lang select {
  appearance: none;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 8px 16px;
  font: 500 14px/1.2 inherit;
  color: var(--ink);
  box-shadow: 0 1px 2px rgba(60,64,67,.06);
}

.card {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 36px 32px 32px;
}

.gate-card { max-width: 480px; margin: 10vh auto 0; text-align: center; }
.share-card { text-align: center; }

h1 {
  margin: 0 0 8px;
  font-size: 1.6rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.3;
}

.lead { margin: 0 0 28px; color: var(--muted); font-size: 1rem; }

.digits {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-bottom: 18px;
}

.digits input {
  width: 48px;
  height: 58px;
  border: 1px solid var(--line);
  border-radius: 16px;
  text-align: center;
  font-size: 1.4rem;
  font-weight: 600;
  background: #f8f9fa;
  color: var(--ink);
  caret-color: var(--ink);
}
.digits input:focus {
  outline: none;
  border-color: #80868b;
  background: #fff;
  box-shadow: 0 0 0 3px rgba(60,64,67,.12);
}

.error { min-height: 1.2em; color: var(--danger); font-size: .9rem; margin: 0 0 14px; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  max-width: 280px;
  height: 48px;
  border: 0;
  border-radius: 999px;
  background: var(--btn);
  color: var(--btn-ink);
  font: 600 15px/1 inherit;
  text-decoration: none;
  cursor: pointer;
}
.btn:disabled { opacity: .55; cursor: default; }
.btn-link { margin: 20px auto 0; }

.photo-wrap {
  margin: 24px 0 0;
  border-radius: 24px;
  overflow: hidden;
  background: #f1f3f4;
}
.photo-wrap img {
  display: block;
  width: 100%;
  height: auto;
  vertical-align: middle;
}

.credit {
  margin: 20px 0 0;
  color: var(--muted);
  font-size: .92rem;
  line-height: 1.55;
  text-align: left;
}
.credit a { color: inherit; text-underline-offset: 2px; }

@media (max-width: 520px) {
  .page { padding: 16px 14px 48px; }
  .card { padding: 28px 18px 22px; border-radius: 28px; }
  .digits { gap: 6px; }
  .digits input { width: 42px; height: 52px; border-radius: 14px; }
  h1 { font-size: 1.35rem; }
}