.viewport {
  --guide-paper: #faf6ec;
  --guide-ink: #2f2a22;
  --guide-ink-muted: #5c5346;
  --guide-line: rgba(120, 90, 50, .28);
  --guide-line-soft: rgba(120, 90, 50, .16);
  --guide-accent: #a8823f;

  display: grid;
  flex: 1 1 auto;
  min-height: 0;
  overflow: auto;
  box-sizing: border-box;
  place-items: center;
  padding: clamp(18px, 5vw, 52px);
  color: var(--guide-ink);
  border-radius: 0;
  background:
    linear-gradient(rgba(250, 246, 236, .82), rgba(250, 246, 236, .92)),
    repeating-linear-gradient(0deg, transparent 0 3px, rgba(120, 90, 50, .025) 3px 4px),
    #e7ddc9;
  font-family: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "STSong", "SimSun", serif;
}

.card {
  width: min(100%, 620px);
  box-sizing: border-box;
  padding: clamp(28px, 6vw, 58px);
  color: var(--guide-ink);
  border: 1px solid var(--guide-line);
  border-radius: 0;
  background: var(--guide-paper);
  box-shadow: 0 12px 36px rgba(50, 38, 18, .11);
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--guide-accent);
  font: 600 12px/1.4 "Noto Serif SC", "Source Han Serif SC", "Songti SC", "STSong", "SimSun", serif;
  letter-spacing: .16em;
}

.title {
  margin: 0;
  color: var(--guide-ink);
  font-size: clamp(24px, 5vw, 36px);
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: .03em;
}

.lead {
  margin: 14px 0 0;
  color: var(--guide-ink-muted);
  font-size: 14px;
  line-height: 1.9;
}

.reason {
  display: grid;
  gap: 5px;
  margin: 22px 0 0;
  padding: 12px 14px;
  color: var(--guide-ink-muted);
  border: 1px solid var(--guide-line);
  border-left: 3px solid var(--guide-accent);
  border-radius: 0;
  background: rgba(168, 130, 63, .08);
  font: 13px/1.7 "Noto Serif SC", "Source Han Serif SC", "Songti SC", "STSong", "SimSun", serif;
}

.reason span {
  color: var(--guide-ink);
  font-weight: 650;
}

.steps {
  display: grid;
  gap: 0;
  margin: 26px 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--guide-line-soft);
}

.steps li {
  display: flex;
  align-items: center;
  gap: 13px;
  min-height: 54px;
  color: var(--guide-ink-muted);
  border-bottom: 1px solid var(--guide-line-soft);
  font-size: 14px;
  line-height: 1.6;
}

.steps li span {
  flex: none;
  color: var(--guide-accent);
  font: 20px/1 "Noto Serif SC", "Source Han Serif SC", "Songti SC", "STSong", "SimSun", serif;
}

.steps li strong {
  color: var(--guide-ink);
  font-weight: 600;
}

.download {
  display: inline-flex;
  min-height: 42px;
  box-sizing: border-box;
  align-items: center;
  justify-content: center;
  padding: 0 20px;
  color: var(--guide-paper);
  border: 1px solid var(--guide-accent);
  border-radius: 0;
  background: var(--guide-accent);
  font: 600 14px/1.4 "Noto Serif SC", "Source Han Serif SC", "Songti SC", "STSong", "SimSun", serif;
  text-decoration: none;
}

.download:hover {
  color: var(--guide-paper);
  border-color: var(--guide-ink);
  background: var(--guide-ink);
}

.download:focus-visible {
  outline: 2px solid var(--guide-accent);
  outline-offset: 3px;
}

.launchFallback {
  margin: 8px 0 0;
  color: var(--guide-ink-muted);
  font: 12px/1.7 "Noto Serif SC", "Source Han Serif SC", "Songti SC", "STSong", "SimSun", serif;
}

.retry {
  margin: 18px 0 0;
  color: var(--guide-ink-muted);
  font: 12px/1.7 "Noto Serif SC", "Source Han Serif SC", "Songti SC", "STSong", "SimSun", serif;
}

@media (max-width: 520px) {
  .viewport { padding: 12px; }
  .card { padding: 26px 22px; }
  .download { width: 100%; }
}