:root {
  --ink: #111318;
  --muted: #676b73;
  --line: #e8e9ec;
  --soft: #f6f7f8;
  --blue: #2764f2;
  --blue-dark: #194ed1;
  --max: 1120px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--ink);
  background: #fff;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }

.site-header {
  width: min(calc(100% - 48px), var(--max));
  height: 84px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
}

.brand { display: inline-flex; align-items: center; gap: 10px; font-size: 19px; font-weight: 700; letter-spacing: .08em; }

.brand-mark { position: relative; display: inline-block; width: 28px; height: 28px; }
.brand-mark i { position: absolute; display: block; width: 16px; height: 16px; border-radius: 5px; border: 2px solid var(--ink); background: #fff; }
.brand-mark i:nth-child(1) { left: 0; top: 6px; }
.brand-mark i:nth-child(2) { right: 0; top: 0; border-color: var(--blue); }
.brand-mark i:nth-child(3) { right: 0; bottom: 0; }

nav { display: flex; gap: 32px; font-size: 14px; color: var(--muted); }
nav a { padding: 10px 0; transition: color .2s ease; }
nav a:hover, nav a.active { color: var(--ink); }

.hero {
  width: min(calc(100% - 48px), 920px);
  margin: 0 auto;
  padding: 148px 0 110px;
  text-align: center;
}

.eyebrow { margin: 0 0 22px; color: var(--blue); font-size: 12px; font-weight: 750; letter-spacing: .2em; }
h1 { margin: 0; font-size: clamp(42px, 6vw, 72px); line-height: 1.16; letter-spacing: -.04em; }
.hero-copy { max-width: 620px; margin: 28px auto 0; color: var(--muted); font-size: 18px; line-height: 1.8; }

.product-wrap { width: min(calc(100% - 48px), var(--max)); margin: 0 auto; }
.product-card {
  padding: 24px 8% 64px;
  display: flex;
  flex-direction: column;
  align-items: center;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 30px;
  background: linear-gradient(135deg, #fbfcff 0%, #f3f6ff 100%);
}

.product-art {
  display: block;
  width: 100%;
  max-width: 400px;
  margin: 0 auto -20px;
  border-radius: 34px;
  object-fit: cover;
}

.product-content { position: relative; z-index: 1; width: 100%; max-width: 680px; text-align: center; }
.product-label { margin: 0 0 12px; color: var(--blue); font-size: 13px; font-weight: 700; }
.product-content h2 { margin: 0 0 20px; font-size: clamp(34px, 5vw, 50px); letter-spacing: -.035em; }
.product-content > p:not(.product-label) { max-width: 560px; margin: 0 auto; color: var(--muted); font-size: 17px; line-height: 1.8; }
.store-row { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px; margin-top: 34px; }
.store-button { min-width: 174px; padding: 10px 17px; display: flex; align-items: center; gap: 11px; border-radius: 14px; color: #fff; background: var(--ink); }
.store-button b { width: 23px; text-align: center; font-size: 27px; line-height: 1; }
.store-button span { display: flex; flex-direction: column; font-size: 16px; font-weight: 650; line-height: 1.15; }
.store-button small { margin-bottom: 3px; color: #b7b9be; font-size: 9px; font-weight: 500; letter-spacing: .08em; }
.store-button.disabled { cursor: default; opacity: .58; }
.play-symbol { color: #fff; font-size: 20px !important; }

.promise { width: min(calc(100% - 48px), var(--max)); margin: 98px auto 130px; display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.promise div { padding: 38px 20px; display: flex; flex-direction: column; align-items: center; gap: 8px; text-align: center; }
.promise div + div { border-left: 1px solid var(--line); }
.promise strong { font-size: 17px; }
.promise span { color: var(--muted); font-size: 13px; }

.document-page { width: min(calc(100% - 48px), 760px); margin: 0 auto; padding: 110px 0 130px; }
.document-page h1 { font-size: clamp(40px, 7vw, 58px); }
.updated { margin: 18px 0 40px; color: var(--muted); font-size: 13px; }
.document-intro { margin-bottom: 64px; padding: 28px 30px; border-radius: 18px; color: #263452; background: #f3f6ff; font-size: 17px; line-height: 1.85; }
.document-page section { padding: 34px 0; border-top: 1px solid var(--line); }
.document-page section h2 { margin: 0 0 14px; font-size: 20px; }
.document-page section p { margin: 0; color: #4f545d; font-size: 15px; line-height: 1.9; }
.back-link { display: inline-block; margin-top: 42px; color: var(--blue); font-size: 14px; }
.back-link:hover { color: var(--blue-dark); }

footer { width: min(calc(100% - 48px), var(--max)); min-height: 116px; margin: 0 auto; display: flex; align-items: center; justify-content: space-between; border-top: 1px solid var(--line); color: var(--muted); font-size: 12px; }
footer div { display: flex; gap: 24px; }
footer a:hover { color: var(--ink); }

@media (max-width: 760px) {
  .site-header { width: min(calc(100% - 32px), var(--max)); height: 70px; }
  nav { gap: 17px; font-size: 13px; }
  .hero { width: min(calc(100% - 32px), 920px); padding: 92px 0 72px; text-align: left; }
  .hero-copy { margin-left: 0; font-size: 16px; }
  .product-wrap, .promise, footer { width: min(calc(100% - 32px), var(--max)); }
  .product-card { padding: 26px 24px 48px; border-radius: 24px; }
  .product-art { max-width: 340px; margin: 0 auto -16px; border-radius: 28px; }
  .promise { margin: 68px auto 90px; grid-template-columns: 1fr; }
  .promise div + div { border-left: 0; border-top: 1px solid var(--line); }
  .document-page { width: min(calc(100% - 32px), 760px); padding: 76px 0 96px; }
  .document-intro { padding: 23px; }
  footer { padding: 30px 0; flex-direction: column; align-items: flex-start; justify-content: center; gap: 18px; }
}