:root {
  color-scheme: light dark;
  --canvas: #fff;
  --grouped: #f2f2f7;
  --ink: #1c1c1e;
  --muted: #5c5c64;
  --rule: rgba(60, 60, 67, .16);
  --blue: #365fd6;
}

* { box-sizing: border-box; }
body { margin: 0; background: var(--canvas); color: var(--ink); font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; -webkit-font-smoothing: antialiased; }
img { display: block; max-width: 100%; height: auto; }
h1, h2, p, figure { margin: 0; }
a { color: var(--blue); }
a:focus-visible { outline: 3px solid var(--blue); outline-offset: 5px; }
.wrap { width: min(960px, calc(100% - 48px)); margin-inline: auto; }
.skip { position: absolute; left: 20px; top: -100px; z-index: 5; display: inline-flex; align-items: center; min-height: 44px; padding: 12px; background: var(--canvas); }
.skip:focus { top: 12px; }
.masthead { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding-block: 18px; }
.brand { display: inline-flex; align-items: center; min-height: 44px; gap: 10px; color: var(--ink); text-decoration: none; font-size: 20px; font-weight: 700; }
.brand img { border-radius: 10px; }
.platform { color: var(--muted); font-size: 13px; line-height: 1.4; }

.guide { max-width: 520px; padding-block: 36px 52px; }
h1 { font-size: clamp(34px, 5vw, 52px); line-height: 1.08; letter-spacing: -.04em; font-weight: 700; text-wrap: balance; }
.intro { margin-top: 16px; color: var(--muted); font-size: 18px; line-height: 1.5; }
.steps { list-style: none; margin: 28px 0 0; padding: 20px; border-radius: 16px; background: var(--grouped); }
.steps li { display: grid; grid-template-columns: 20px minmax(0, 1fr); gap: 12px; align-items: start; }
.steps li + li { margin-top: 20px; }
.step-number { padding-top: 1px; color: var(--blue); font-size: 18px; line-height: 1.4; font-weight: 700; }
.step-title { font-size: 16px; line-height: 1.4; font-weight: 600; }
.step-title strong { font-weight: 600; }
.step-detail { margin-top: 4px; color: var(--muted); font-size: 14px; line-height: 1.45; }
.step-detail strong { font-weight: 400; }
.menu-symbol { display: inline-block; width: 24px; height: 12px; vertical-align: middle; fill: currentColor; }
.download-area { margin-top: 24px; }
.download-area > p { color: var(--muted); font-size: 14px; line-height: 1.5; }
.download { display: inline-flex; align-items: center; min-height: 60px; margin-top: 12px; border-radius: 12px; }
.download img { width: 180px; height: 60px; }
.download:hover { opacity: .8; }

.proof-band { background: var(--grouped); }
.proof { max-width: 600px; padding-block: 40px; text-align: center; }
.proof h2 { font-size: 27px; line-height: 1.16; letter-spacing: -.025em; font-weight: 700; text-wrap: balance; }
.proof-intro { margin-top: 12px; color: var(--muted); font-size: 16px; line-height: 1.5; }
.product-stage { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); align-items: start; gap: 20px; max-width: 432px; margin: 28px auto 0; }
.device { padding: 3px; background: #0b0e11; border: 1px solid #747477; border-radius: 27px; overflow: hidden; }
.device img { width: 100%; aspect-ratio: 603 / 1311; object-fit: contain; border-radius: 23px; }
figcaption { margin-top: 12px; color: var(--muted); font-size: 12px; line-height: 1.45; text-wrap: balance; }

.footer { padding-block: 20px 28px; color: var(--muted); font-size: 12px; line-height: 1.5; }
.footer-row { display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.footer nav { display: flex; flex-wrap: wrap; gap: 0 24px; }
.footer a { display: inline-flex; align-items: center; min-height: 44px; text-underline-offset: 4px; }
.footer > p { margin-top: 8px; font-size: 11px; }

@media (prefers-color-scheme: dark) {
  :root { --canvas: #0a0b0e; --grouped: #1c1c1e; --ink: #f2f2f7; --muted: #aeaeb2; --rule: #38383a; --blue: #a9b9ff; }
}

@media (max-width: 600px) {
  .wrap { width: calc(100% - 40px); }
  .masthead { padding-block: 10px; }
  .brand { font-size: 20px; }
  .platform { font-size: 12px; }
  .guide { padding-block: 16px 32px; }
  h1 { max-width: 350px; font-size: 38px; }
  .intro { margin-top: 12px; font-size: 16px; line-height: 1.4; }
  .steps { margin-top: 20px; padding: 16px; }
  .steps li { grid-template-columns: 16px minmax(0, 1fr); gap: 10px; }
  .steps li + li { margin-top: 16px; }
  .step-title { font-size: 15px; }
  .step-detail { font-size: 13px; }
  .download-area { margin-top: 20px; }
  .download-area > p { font-size: 13px; }
  .download { margin-top: 10px; }
  .proof { padding-block: 32px; }
  .proof h2 { font-size: 25px; }
  .proof-intro { font-size: 15px; }
  .product-stage { gap: 12px; margin-top: 24px; }
  .device { padding: 2px; border-radius: 22px; }
  .device img { border-radius: 19px; }
  figcaption { font-size: 11px; }
  .footer-row { flex-direction: column; align-items: flex-start; gap: 4px; }
  .footer nav { gap: 0 20px; }
}

@media (max-width: 360px) {
  .wrap { width: calc(100% - 32px); }
  .guide { padding-top: 12px; }
  h1 { font-size: 34px; }
  .steps { padding: 14px; margin-top: 16px; }
  .step-title { font-size: 14px; }
  .step-detail { font-size: 12px; }
  .menu-symbol { width: 20px; }
  .product-stage { gap: 10px; }
  .device { border-radius: 19px; }
  .device img { border-radius: 16px; }
}