/* R3 refinement: shared type scale, aligned product story, locale-aware rhythm. */
:root {
  --font-ui: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei UI", "Microsoft YaHei", Arial, sans-serif;
  --space-section: 88px;
  --muted: #64646c;
}
body { font-family: var(--font-ui); font-size:1.0625rem; line-height: 1.65; -webkit-font-smoothing: antialiased; }
button, a { font-family: inherit; }
h1, h2, h3 { font-family: var(--font-ui); font-weight: 600; letter-spacing: -.035em; }
.wrap { width: min(1080px, calc(100% - 64px)); }
.brand { font-family: var(--font-ui); font-size:1.375rem; font-weight: 600; letter-spacing: -.7px; }
.nav { min-height: 68px; }
nav a { font-size:0.8125rem; }
.nav-download { font-weight: 500; }
.hero { padding-top: 48px; padding-bottom: 56px; }
.eyebrow { font-size:0.75rem; line-height: 1.5; font-weight: 600; letter-spacing: .09em; }
h1 { font-size:clamp(2.875rem, 5vw, 4rem); line-height: 1.12; max-width: 950px; margin: 14px auto 0; }
h1 span { color: var(--accent); }
.hero-copy { max-width: 590px; margin: 22px auto 24px; font-size:1.125rem; line-height: 1.6; text-wrap: balance; }
.primary { min-height: 48px; padding: 12px 23px; font-size:0.9375rem; font-weight: 500; letter-spacing: 0; }
.primary svg { width: 19px; height: 19px; }
.product-stage { max-width: 1000px; margin-top: 38px; padding: 26px 46px 24px; border-radius: 28px; gap: 18px; grid-template-columns: minmax(0, 1fr) 28px minmax(0, 1.12fr) 28px minmax(0, 1fr); }
.stage-photo, .stage-phone { width: 100%; max-width: none; display: grid; grid-template-rows: 32px 328px 38px; justify-items: center; align-items: center; }
.stage-photo figcaption, .stage-phone figcaption { margin: 0; line-height: 1.4; font-size:0.875rem; font-weight: 500; white-space: normal; text-align: center; }
.stage-photo img { width: auto; height: 294px; max-height: none; max-width: 100%; border-radius: 8px; object-fit: contain; }
.stage-photo p, .stage-phone>p { font-size:0.75rem; line-height: 1.5; color: var(--muted); margin: 0; text-align: center; }
.stage-phone .phone { width: 185px; margin: 0; padding: 6px; border-radius: 24px; }
.stage-phone .phone img { border-radius: 18px; }
.stage-arrow { font-size:1.5rem; align-self: center; color: #9999a2; }
.stage-note { font-size:0.75rem; max-width: 820px; line-height: 1.6; margin-top: 16px; }
.feature-section { padding-block: var(--space-section); }
.section-heading { max-width: 760px; }
h2 { font-size:clamp(2.125rem, 3.6vw, 2.875rem); line-height: 1.17; }
.section-heading h2 { margin-top: 13px; }
.section-heading>p:last-child { font-size:1.125rem; line-height: 1.6; margin-top: 18px; text-wrap: pretty; }
.feature-tabs { margin-top: 30px; margin-bottom: 26px; gap: 6px; }
.feature-tabs button { font-size:0.875rem; min-height: 46px; padding: 11px 22px; }
.feature-panel { padding: 44px 64px; gap: 64px; grid-template-columns: 1fr 1fr; min-height: 540px; }
.feature-copy { max-width: 370px; }
.feature-index { font-size:0.75rem; letter-spacing: .12em; margin-bottom: 16px; }
.feature-copy h3 { font-size:2.125rem; line-height: 1.22; font-weight: 600; letter-spacing: -.025em; text-wrap: balance; }
.feature-copy>p:not(.feature-index) { font-size:1.0625rem; line-height: 1.7; margin-top: 18px; text-wrap: pretty; }
.feature-copy li { font-size:0.875rem; line-height: 1.6; }
.text-action { font-size:0.875rem; font-weight: 500; }
.feature-visual { width: 230px; }
.feature-visual figcaption { font-size:0.75rem; }
.results-section { padding-block: var(--space-section); }
.result-layout { max-width: 900px; grid-template-columns: 1fr 1fr; gap: 72px; margin-top: 42px; }
.result-explanation h3 { font-size:2rem; line-height: 1.22; font-weight: 600; letter-spacing: -.025em; }
.result-explanation>p { font-size:1.0625rem; line-height: 1.7; }
.caption { font-size:0.75rem; letter-spacing: .06em; }
.result-view { padding: 24px; }
.result-view figcaption { font-size:0.8125rem; }
.fine-print, .results-section>.fine-print { font-size:0.75rem; line-height: 1.65; }
.guide-section { padding-block: 72px; }
.guide-layout { max-width: 1000px; gap: 80px; }
.guide-copy h2 { font-size:2.75rem; line-height: 1.2; }
.guide-copy>p:not(.eyebrow) { font-size:1.0625rem; line-height: 1.7; }
.faq-section { padding-block: 72px; grid-template-columns: .85fr 1.15fr; }
.faq-section h2 { font-size:2.125rem; line-height: 1.25; }
.faq summary { font-size:1rem; font-weight: 500; }
.faq p { font-size:0.9375rem; line-height: 1.75; }
.closing { padding-block: 64px; }
.closing h2 { font-size:2.75rem; line-height: 1.2; }
.closing p { font-size:1.0625rem; }
.closing .store-note { font-size:0.75rem; }
.footer-bottom, .footer-bottom>div p+p { font-size:0.75rem; line-height: 1.6; }
.footer-bottom>div { max-width: 740px; }
.dialog-header h2 { font-size:1.75rem; }
.dialog-content h3 { font-size:1.625rem; font-weight: 600; letter-spacing: -.02em; }
/* Chinese uses its own spacing and measure instead of Latin display tracking. */
html[lang=zh-CN] body { font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Noto Sans SC", "Microsoft YaHei UI", "Microsoft YaHei", "Segoe UI", sans-serif; }
html[lang=zh-CN] h1, html[lang=zh-CN] h2, html[lang=zh-CN] h3 { font-family: inherit; }
html[lang=zh-CN] h1 { font-size:clamp(2.625rem, 4.5vw, 3.5rem); line-height: 1.25; letter-spacing: -.015em; }
html[lang=zh-CN] h2 { font-size:2.625rem; line-height: 1.35; letter-spacing: 0; }
html[lang=zh-CN] h3 { letter-spacing: 0; line-height: 1.4; }
html[lang=zh-CN] .eyebrow { letter-spacing: .055em; }
html[lang=zh-CN] .hero-copy { max-width: 540px; font-size:1.0625rem; line-height: 1.85; word-break: keep-all; overflow-wrap: anywhere; }
html[lang=zh-CN] .section-heading>p:last-child { font-size:1.0625rem; }
html[lang=zh-CN] .feature-copy h3 { font-size:1.875rem; }
html[lang=zh-CN] .result-explanation h3 { font-size:1.8125rem; }
html[lang=zh-CN] .faq-section h2 { font-size:1.875rem; }
html[lang=zh-CN] .dialog-header h2 { font-size:1.5625rem; }
@media(min-width:768px) and (max-width:1000px) {
  .product-stage { padding-inline: 26px; gap: 12px; grid-template-columns: minmax(0,1fr) 20px minmax(0,1.12fr) 20px minmax(0,1fr); }
  .stage-photo, .stage-phone { grid-template-rows: 36px 290px 44px; }
  .stage-photo img { height: 250px; }
  .stage-phone .phone { width: 158px; }
  .stage-photo figcaption, .stage-phone figcaption { font-size:0.8125rem; }
  .feature-panel { padding: 40px; gap: 36px; }
  .feature-visual { width: 205px; }
  .feature-copy h3 { font-size:1.9375rem; }
  .result-layout, .guide-layout { gap: 40px; }
  .nav { gap: 18px; }
}
@media(max-width:767px) {
  :root { --space-section: 56px; }
  .wrap { width: calc(100% - 40px); }
  .nav { min-height: 62px; gap: 12px; }
  .brand { font-size:1.25rem; }
  .nav-download { font-size:0.75rem; padding-inline: 14px; }
  .hero { padding-top: 34px; padding-bottom: 40px; }
  .eyebrow { font-size:0.6875rem; letter-spacing: .06em; }
  h1 { font-size:clamp(2.375rem, 9.7vw, 3.375rem); line-height: 1.13; margin-top: 15px; }
  h1 span { display: block; }
  .hero-copy { font-size:1rem; line-height: 1.65; max-width: 35ch; margin: 18px auto 22px; }
  .primary { font-size:0.875rem; padding: 12px 21px; }
  .product-stage { grid-template-columns: minmax(0,1fr) 18px minmax(0,1fr); padding: 18px 16px; gap: 10px; border-radius: 20px; margin-top: 30px; max-width: 460px; }
  .stage-phone, .stage-arrow:first-of-type { display: none; }
  .stage-photo { display: grid; grid-template-rows: 32px auto; align-content: start; max-width: none; }
  .stage-photo figcaption { font-size:0.75rem; font-weight: 500; line-height: 1.4; }
  .stage-photo img { width: 100%; height: auto; max-height: none; border-radius: 5px; }
  .stage-photo p { display: none; }
  .stage-arrow { display: block; font-size:1.25rem; }
  .stage-note { font-size:0.6875rem; max-width: 44ch; margin-top: 13px; line-height: 1.65; }
  .section-heading h2, .closing h2 { font-size:2.125rem; line-height: 1.2; }
  .section-heading>p:last-child { font-size:1rem; margin-top: 16px; }
  .feature-tabs { gap: 5px; margin: 24px 0; flex-wrap: wrap; }
  .feature-tabs button { font-size:0.75rem; min-height: 44px; padding: 10px 13px; }
  .feature-panel { grid-template-columns: 1fr; gap: 28px; padding: 30px 26px; min-height: 0; border-radius: 22px; }
  .feature-copy { max-width: none; }
  .feature-copy h3 { font-size:1.8125rem; }
  .feature-copy>p:not(.feature-index) { font-size:1rem; }
  .feature-visual { width: 216px; max-width: 100%; }
  .result-layout { grid-template-columns: 1fr; gap: 30px; margin-top: 32px; }
  .result-explanation { max-width: none; }
  .result-explanation h3 { font-size:1.75rem; }
  .result-explanation>p { font-size:1rem; }
  .result-view { padding: 18px; }
  .caption { font-size:0.6875rem; margin-bottom: 20px; }
  .guide-section { padding-block: 52px; }
  .guide-layout { grid-template-columns: 1fr; gap: 30px; }
  .guide-copy h2 { font-size:2.125rem; }
  .guide-copy>p:not(.eyebrow) { font-size:1rem; }
  .faq-section { grid-template-columns: 1fr; gap: 24px; padding-block: 52px; }
  .faq-section h2 { font-size:1.875rem; }
  .faq summary { font-size:1rem; }
  .closing { padding-block: 52px; }
  .closing p { font-size:1rem; }
  .footer-bottom, .footer-bottom>div p+p { font-size:0.6875rem; }
  .dialog-content { grid-template-columns: 1fr; }
  html[lang=zh-CN] h1 { font-size:clamp(2.125rem, 8.8vw, 2.75rem); line-height: 1.3; letter-spacing: 0; }
  html[lang=zh-CN] h2, html[lang=zh-CN] .section-heading h2 { font-size:1.875rem; line-height: 1.4; letter-spacing: 0; }
  html[lang=zh-CN] .hero-copy { font-size:1rem; line-height: 1.85; max-width: 20em; }
  html[lang=zh-CN] .section-heading>p:last-child { font-size:1rem; }
  html[lang=zh-CN] .feature-copy h3, html[lang=zh-CN] .result-explanation h3 { font-size:1.625rem; }
  html[lang=zh-CN] .faq-section h2 { font-size:1.75rem; }
  html[lang=zh-CN] .dialog-header h2 { font-size:1.4375rem; }
}
@media(max-width:360px) {
  .wrap { width: calc(100% - 32px); }
  .brand { font-size:1.1875rem; }
  .nav-download { padding-inline: 12px; }
  .feature-tabs { flex-direction: column; align-items: stretch; }
  .feature-tabs button { font-size:0.8125rem; }
  .product-stage { padding-inline: 12px; gap: 8px; }
  .stage-photo figcaption { font-size:0.6875rem; }
  .feature-panel { padding-inline: 22px; }
}