* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: #111; color: #f6f5ef; font-family: "Avenir Next", "PingFang SC", "Microsoft YaHei", sans-serif; }
a { color: inherit; text-underline-offset: 5px; }
a:focus-visible, button:focus-visible { outline: 3px solid #ffdc00; outline-offset: 5px; }
header, main, footer { width: min(1100px, calc(100% - 48px)); margin: auto; }
header { height: 96px; display: flex; align-items: center; justify-content: space-between; border-bottom: 1px solid #333; }
.brand { display: inline-flex; align-items: center; gap: 12px; text-decoration: none; font-size: 36px; font-weight: 850; letter-spacing: -2px; }
.app-logo { display: block; width: 44px; height: auto; flex: none; border-radius: 10px; }
nav { display: flex; gap: 25px; font-size: 14px; color: #b7b7af; }
nav a { text-decoration: none; }
nav a:hover { color: #ffdc00; }
header nav a { display: inline-flex; align-items: center; min-height: 32px; }
.language-switch { display: inline-flex; gap: 10px; align-items: center; border-left: 1px solid #444; padding-left: 18px; white-space: nowrap; }
.language-switch button { padding: 4px 0; min-height: 32px; border: 0; background: none; color: inherit; font: inherit; cursor: pointer; }
.language-switch button:hover, .language-switch [aria-pressed="true"] { color: #ffdc00; }
.language-switch [aria-pressed="true"] { text-decoration: underline; text-underline-offset: 5px; }
.hero { display: grid; grid-template-columns: 1.2fr 1fr; align-items: center; gap: 60px; padding: 70px 0 85px; }
.hero > div, .detail > div, .steps > article { min-width: 0; }
.eyebrow { color: #ffdc00; font-size: 12px; letter-spacing: 3px; }
.hero h1 { font-size: clamp(48px, 6vw, 76px); line-height: 1.16; letter-spacing: -3px; margin: 25px 0; }
.hero h1 span { color: #ffdc00; }
.lead { font-size: 18px; color: #b1b1a8; line-height: 1.9; max-width: 420px; }
.button { display: inline-flex; padding: 17px 27px; border-radius: 40px; background: #ffdc00; color: #111; text-decoration: none; font-weight: 700; margin-top: 22px; gap: 40px; }
.caption { font-size: 12px; color: #99998e; margin-top: 20px; }
.visual { position: relative; text-align: center; }
.phone { width: 252px; max-width: 80%; height: auto; object-fit: contain; border: 7px solid #303030; border-radius: 40px; box-shadow: 0 24px 70px #0008; }
.tag { position: absolute; left: 0; bottom: 20%; background: #ffdc00; color: #111; padding: 13px 20px; transform: rotate(-7deg); font-size: 14px; font-weight: 700; border-radius: 5px; }
.section { border-top: 1px solid #333; padding: 56px 0; }
.section h2 { font-size: 34px; letter-spacing: -1px; margin: 14px 0 35px; }
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 42px; }
.number { font-size: 12px; letter-spacing: 2px; color: #ffdc00; }
.steps h3 { font-size: 22px; margin: 22px 0 12px; }
.steps p, .detail p { font-size: 15px; line-height: 1.9; color: #b1b1a8; }
.detail { display: grid; grid-template-columns: 1fr 1.2fr; gap: 60px; align-items: center; padding: 25px 0 65px; }
.detail img { display: block; margin: auto; width: 225px; }
.detail h2 { font-size: 40px; line-height: 1.35; }
.pill { display: inline-block; border: 1px solid #444; border-radius: 30px; padding: 8px 13px; font-size: 12px; color: #ccc; margin: 8px 5px 0 0; }
.links { display: flex; align-items: center; justify-content: space-between; gap: 30px; }
.links h2 { font-size: 26px; margin: 15px 0; }
.links p { color: #aaa; }
.links div:last-child { display: flex; gap: 26px; }
footer { padding: 28px 0 36px; border-top: 1px solid #333; display: flex; justify-content: space-between; gap: 20px; color: #96968b; font-size: 12px; }
.legal { max-width: 800px; padding: 60px 0 80px; overflow-wrap: anywhere; }
.legal h1 { font-size: 44px; letter-spacing: -2px; margin: 18px 0; }
.meta { font-size: 13px; color: #999; }
.legal h2 { font-size: 23px; margin-top: 36px; }
.legal p { font-size: 15px; line-height: 1.95; color: #c4c3b9; }
.legal a { color: #ffdc00; }
.legal strong { color: #f6f5ef; }
.toc { display: flex; gap: 20px; flex-wrap: wrap; font-size: 13px; }
table { border-collapse: collapse; width: 100%; font-size: 14px; line-height: 1.85; }
.legal table { table-layout: fixed; }
th, td { padding: 14px 10px; text-align: left; border-bottom: 1px solid #393939; vertical-align: top; }
th { color: #ffdc00; }
td { color: #c4c3b9; }
.legal h2[id], #how { scroll-margin-top: 24px; }
html[lang="en"] .hero h1 { font-size: clamp(40px, 5.2vw, 66px); letter-spacing: -2px; }
html[lang="en"] .detail h2 { font-size: 36px; }
html[lang="en"] .tag { font-size: 13px; }
@media (max-width: 760px) {
  header { height: auto; min-height: 88px; gap: 16px; padding: 20px 0; flex-wrap: wrap; }
  header nav { flex-wrap: wrap; gap: 12px 18px; align-items: center; }
  .language-switch { padding-left: 12px; }
  html[lang="en"] .hero h1 { font-size: 46px; letter-spacing: -1.5px; }
  html[lang="en"] .detail h2 { font-size: 30px; }
}
@media (max-width: 700px) {
  .brand { gap: 8px; font-size: 30px; }
  .app-logo { width: 34px; border-radius: 8px; }
  nav { gap: 12px; font-size: 12px; }
  .hero { grid-template-columns: 1fr; gap: 35px; padding: 45px 0 60px; }
  .hero h1 { font-size: 52px; letter-spacing: -2px; }
  .visual { max-width: 340px; margin: auto; width: 100%; }
  .steps { grid-template-columns: 1fr; gap: 26px; }
  .steps h3 { margin-top: 12px; }
  .detail { grid-template-columns: 1fr; gap: 25px; }
  .detail h2 { font-size: 32px; }
  .links { align-items: flex-start; flex-direction: column; }
  footer { flex-wrap: wrap; }
  .legal { padding-top: 35px; }
  .legal h1 { font-size: 36px; }
  th, td { padding: 10px 5px; font-size: 12px; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }