body.install { background: linear-gradient(180deg, var(--night) 0, var(--night-2) 340px, var(--bg) 340px); }
.wrap { max-width: 640px; margin: 0 auto; padding: 84px 16px 64px; }
.app-card {
  background: var(--card); border: 1px solid var(--line); border-radius: 28px; padding: 32px 22px 28px;
  text-align: center; box-shadow: var(--shadow);
}
.app-icon { margin: -84px auto 16px; border-radius: 26px; box-shadow: 0 18px 34px -14px rgba(11, 20, 64, .7); }
.app-card h1 { font-size: 30px; font-weight: 900; }
.sub { margin: 6px 0 20px; color: var(--ink-2); font-weight: 600; }
.facts { display: grid; grid-template-columns: repeat(3, 1fr); margin: 0 0 24px; border: 1px solid var(--line); border-radius: 16px; overflow: hidden; }
.facts div { padding: 10px 6px; }
.facts div + div { border-left: 1px solid var(--line); }
.facts dt { font-size: 12px; color: var(--ink-2); font-weight: 700; }
.facts dd { margin: 2px 0 0; font-weight: 800; font-size: 15px; font-variant-numeric: tabular-nums; }
.install-btn { width: 100%; min-height: 58px; font-size: 19px; }
.hint { margin: 14px 0 0; color: var(--ink-2); font-size: 14px; }
.notice { text-align: center; }
.notice b { display: block; font-size: 19px; margin-bottom: 6px; }
.notice p { color: var(--ink-2); margin: 0 0 16px; }
.btn-line { border: 0; cursor: pointer; font-family: inherit; background: var(--brand); color: #fff; box-shadow: 0 6px 0 var(--brand-ink); }
.btn-line:active { box-shadow: 0 3px 0 var(--brand-ink); }
.qr { width: 196px; height: 196px; margin: 0 auto; padding: 12px; background: #fff; border-radius: 18px; border: 1px solid var(--line); }
.qr svg { width: 100%; height: 100%; display: block; }

.guide, .faq { margin-top: 44px; }
.guide h2, .faq h2 { font-size: 22px; font-weight: 900; margin-bottom: 18px; }
.install .steps { gap: 14px; }
.install .steps li { padding: 18px 18px 18px 72px; }
.install .steps li::before { left: 18px; top: 18px; width: 38px; height: 38px; font-size: 18px; }
.install .steps b { font-size: 17px; }
.steps details { margin-top: 10px; }
.steps summary, .faq summary { cursor: pointer; font-weight: 800; color: var(--brand); }
.steps details p { margin: 8px 0 0; color: var(--ink-2); font-size: 14.5px; }
.faq details { background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 16px 18px; margin-bottom: 10px; }
.faq summary { color: var(--ink); }
.faq details p { margin: 10px 0 0; color: var(--ink-2); font-size: 15px; }
.foot a { color: var(--brand); text-decoration: none; font-weight: 700; }