:root {
  color-scheme: light;
  --surface: #ffffff;
  --forest: #17251e;
  --muted: #52625c;
  --accent: #c8f85b;
  --border: #e4e8e1;
  --gutter: clamp(24px, 4.4vw, 68px);
  --content-width: 1400px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, "PingFang SC", "Microsoft YaHei", sans-serif;
  font-synthesis: none;
  color: var(--forest);
  background: var(--surface);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 32px; }
body { margin: 0; }
a { color: inherit; }
img { display: block; max-width: 100%; height: auto; }
figure, blockquote { margin: 0; }
p { margin: 0; }
svg { flex: none; }
::selection { background: var(--accent); color: var(--forest); }
:focus-visible { outline: 3px solid #376b40; outline-offset: 6px; border-radius: 3px; }
.page-width { width: min(calc(100% - var(--gutter) * 2), var(--content-width)); margin-inline: auto; }
.skip-link { position: absolute; left: var(--gutter); top: 12px; z-index: 10; padding: 12px 20px; background: var(--forest); color: white; transform: translateY(-180%); }
.skip-link:focus { transform: translateY(0); }

.site-header { min-height: 100px; display: flex; align-items: center; justify-content: space-between; gap: 24px; border-bottom: 1px solid var(--border); }
.brand { display: inline-flex; align-items: center; gap: 12px; font-size: 29px; font-weight: 700; letter-spacing: -1.2px; text-decoration: none; white-space: nowrap; }
.brand img { width: 52px; height: 52px; border-radius: 12px; }
.site-nav { display: flex; align-items: center; gap: 32px; font-size: 15px; font-weight: 550; }
.site-nav > a:not(.nav-store) { text-decoration: none; text-underline-offset: 6px; }
.site-nav > a:not(.nav-store):hover { text-decoration: underline; }
.nav-store { display: inline-flex; align-items: center; justify-content: center; gap: 9px; min-height: 50px; padding: 0 22px; border-radius: 14px; background: var(--forest); color: white; font-size: 16px; font-weight: 650; text-decoration: none; transition: background 160ms ease, transform 160ms ease; }
.nav-store:hover { background: #2d4536; transform: translateY(-1px); }
.apple-mark { width: 21px; height: 25px; fill: currentColor; }

.hero { min-height: calc(100svh - 100px); display: grid; align-items: center; padding-block: clamp(48px, 6vh, 88px); }
.hero-inner { display: grid; grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.3fr); align-items: center; gap: clamp(32px, 3.4vw, 56px); }
.hero-copy h1 { margin: 0; font-size: clamp(46px, 4.85vw, 74px); font-weight: 700; line-height: 1.06; letter-spacing: -0.055em; }
.hero-copy h1 span { display: block; }
.hero-lede { max-width: 29em; margin-top: 22px; color: var(--muted); font-size: clamp(18px, 1.55vw, 23px); line-height: 1.45; letter-spacing: -0.025em; }
.hero-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 22px 28px; margin-top: 34px; }
.store-button { display: inline-flex; align-items: center; justify-content: center; gap: 12px; padding: 17px 24px; min-height: 62px; border-radius: 14px; background: var(--accent); color: var(--forest); font-size: 17px; line-height: 1.3; font-weight: 650; text-decoration: none; transition: background 160ms ease, transform 160ms ease; }
.store-button .apple-mark { width: 24px; height: 28px; }
.store-button:hover { background: #b9ed43; transform: translateY(-1px); }
.text-link { display: inline-flex; align-items: center; gap: 12px; font-size: 18px; line-height: 1.5; text-decoration-thickness: 1px; text-underline-offset: 6px; }
.text-link:hover { text-decoration-thickness: 2px; }
.availability { margin-top: 17px; color: var(--muted); font-size: 14px; line-height: 1.5; }
.device-landscape { border: 8px solid #17201b; border-radius: 30px; overflow: hidden; background: #17201b; box-shadow: 0 24px 36px -20px rgb(15 25 19 / 35%), 0 0 0 1px #70766e; }
.device-landscape img { width: 100%; border-radius: 20px; }

.section { padding-block: 88px; }
.section h2 { margin: 0; font-size: clamp(36px, 4.3vw, 48px); line-height: 1.12; letter-spacing: -0.045em; font-weight: 700; text-wrap: balance; }
.section-lede { margin-top: 14px; color: var(--muted); font-size: 21px; line-height: 1.5; letter-spacing: -0.02em; }
.workflow { border-top: 1px solid var(--border); }
.workflow-carousel { min-width: 0; }
.workflow-track {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: calc((100% - 64px) / 3.15);
  column-gap: 32px;
  row-gap: 0;
  align-items: stretch;
  max-width: 100%;
  margin-top: 24px;
  padding-block: 6px 28px;
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scroll-snap-type: x mandatory;
  scroll-behavior: auto;
  scrollbar-width: none;
  touch-action: auto;
  cursor: grab;
}
.workflow-track::-webkit-scrollbar { display: none; }
.workflow-track[data-dragging="true"] { cursor: grabbing; user-select: none; }
.workflow-step { min-width: 0; display: flex; flex-direction: column; padding-right: 24px; border-right: 1px solid var(--border); scroll-snap-align: start; }
.workflow-step:last-child { border-right: 0; }
.step-copy { min-height: 234px; }
/* Shared content rows align native screens even when translated text wraps. */
@supports (grid-template-rows: subgrid) {
  .workflow-track { grid-template-rows: auto auto; }
  .workflow-step { display: grid; grid-template-rows: subgrid; grid-row: span 2; row-gap: 0; }
  .workflow-track .step-copy { min-height: 0; }
}
.workflow-controls { display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: center; gap: 14px 24px; margin-top: 26px; color: var(--muted); }
.workflow-drag-hint { font-size: 14px; line-height: 1.5; }
.workflow-navigation { display: flex; align-items: center; justify-content: flex-end; gap: 10px; }
.workflow-position { margin-right: 8px; font-size: 14px; line-height: 1.4; font-variant-numeric: tabular-nums; white-space: nowrap; }
.workflow-control { flex: none; width: 46px; min-height: 46px; display: inline-flex; align-items: center; justify-content: center; padding: 0; border: 1px solid #c4cec5; border-radius: 50%; background: white; color: var(--forest); font: inherit; font-size: 23px; cursor: pointer; transition: background 160ms ease, border-color 160ms ease; }
.workflow-control:hover:not(:disabled) { background: var(--accent); border-color: var(--accent); }
.workflow-control:disabled { opacity: 0.35; cursor: default; }
.step-number { display: block; margin-bottom: 6px; color: var(--accent); font-size: 44px; line-height: 1; letter-spacing: -0.05em; font-weight: 650; }
.workflow-step h3 { margin: 0; font-size: clamp(22px, 2vw, 29px); line-height: 1.2; letter-spacing: -0.045em; font-weight: 700; }
.workflow-step p { max-width: 23em; margin-top: 9px; color: var(--muted); font-size: 17px; line-height: 1.45; letter-spacing: -0.02em; }
.device-portrait { width: min(100%, 278px); margin: 20px auto 0; border: 6px solid #17201b; border-radius: 29px; overflow: hidden; background: #17201b; box-shadow: 0 15px 24px -14px rgb(15 25 19 / 38%), 0 0 0 1px #72776e; }
.device-portrait img { width: 100%; border-radius: 21px; }
.workflow-step .device-portrait { width: min(100%, 258px); margin: 22px auto 0; align-self: start; }
.device-portrait--tablet { width: min(100%, 330px); border-radius: 22px; }
.device-portrait--tablet img { border-radius: 15px; }
.media-caption { margin-top: 34px; color: var(--muted); text-align: center; font-size: 13px; line-height: 1.6; }

.reviews { border-top: 1px solid var(--border); }
.review-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 48px; margin-top: 42px; margin-bottom: 34px; }
.review { border-top: 1px solid #c4cec5; padding-top: 24px; }
.review blockquote { max-width: 20em; font-size: clamp(26px, 2.75vw, 34px); font-weight: 650; line-height: 1.28; letter-spacing: -0.035em; }
.review figcaption { margin-top: 20px; color: var(--muted); font-size: 14px; line-height: 1.6; }
.review cite { display: block; margin-bottom: 9px; font-size: 18px; font-style: normal; overflow-wrap: anywhere; }
.review-meta { display: flex; align-items: baseline; flex-wrap: wrap; gap: 4px 10px; }
.review-meta a { text-decoration-thickness: 1px; text-underline-offset: 3px; }
.review-excerpt { display: block; margin-top: 5px; font-size: 12px; }
.arrow { width: 23px; height: 23px; fill: none; stroke: currentColor; stroke-width: 1.5; stroke-linecap: round; stroke-linejoin: round; }

.privacy { padding-block: 72px; background: var(--forest); color: white; }
.privacy .section-lede { max-width: 53em; color: #dce7de; }
.privacy .text-link { margin-top: 25px; }
.privacy :focus-visible { outline-color: var(--accent); }
.guides h2 { font-size: clamp(30px, 2.7vw, 40px); }
.guide-links { margin-top: 32px; border-top: 1px solid var(--border); }
.guide-links a { display: flex; align-items: center; justify-content: space-between; gap: 24px; min-height: 72px; padding-block: 18px; border-bottom: 1px solid var(--border); font-size: 21px; line-height: 1.4; text-decoration: none; letter-spacing: -0.025em; }
.guide-links a:hover .arrow { transform: translateX(3px); }
.guide-links .arrow { transition: transform 160ms ease; }
.guide-links a:hover span { text-decoration: underline; text-underline-offset: 5px; }
.closing { padding-top: 12px; }
.closing h2 { max-width: 28em; margin-bottom: 24px; }
.site-footer { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 24px; padding-block: 26px; border-top: 1px solid var(--border); }
.footer-brand { display: block; font-size: 23px; font-weight: 700; letter-spacing: -1px; text-decoration: none; }
.site-copyright { margin-top: 12px; color: var(--muted); font-size: 12px; line-height: 1.5; }
.footer-nav { display: flex; flex-wrap: wrap; align-items: flex-start; gap: 26px; padding-top: 6px; font-size: 14px; }
.footer-nav a { text-decoration: none; }
.footer-nav a:hover { text-decoration: underline; text-underline-offset: 5px; }

@keyframes settle-in { from { opacity: 0.3; transform: translateY(6px); } to { opacity: 1; transform: translateY(0); } }
@media (prefers-reduced-motion: no-preference) {
  .motion-ready .hero-copy, .motion-ready .hero-product { animation: settle-in 420ms ease-out both; }
  .motion-ready .hero-product { animation-delay: 50ms; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .store-button:hover, .nav-store:hover, .guide-links a:hover .arrow { transform: none; }
}

:lang(zh-Hans) .hero-copy h1 { font-size: clamp(42px, 4.3vw, 66px); letter-spacing: -0.045em; line-height: 1.2; }
:lang(zh-Hans) .hero-lede { max-width: 24em; line-height: 1.65; }
:lang(zh-Hans) .section h2 { line-height: 1.3; letter-spacing: -0.035em; }
:lang(zh-Hans) .workflow-step p { line-height: 1.65; }
:lang(zh-Hans) .review blockquote { font-size: clamp(23px, 2.15vw, 32px); line-height: 1.55; letter-spacing: -0.015em; }

@media (min-width: 1600px) {
  .hero { min-height: min(calc(100svh - 100px), 920px); }
}
@media (max-width: 1100px) {
  .site-nav { gap: 23px; }
  .hero-actions { gap: 20px; }
  .hero .store-button { font-size: 16px; padding-inline: 20px; }
  .hero .text-link { font-size: 16px; }
}
@media (max-width: 800px) {
  .site-header { min-height: 80px; gap: 16px; }
  .brand { gap: 9px; font-size: 24px; }
  .brand img { width: 42px; height: 42px; border-radius: 10px; }
  .site-nav { gap: 19px; font-size: 14px; }
  .site-nav .section-nav { display: none; }
  .nav-store { min-height: 43px; font-size: 14px; padding-inline: 15px; border-radius: 11px; }
  .nav-store .apple-mark { width: 16px; height: 20px; }
  .hero { min-height: auto; padding-block: 44px 62px; }
  .hero-inner { grid-template-columns: 1fr; gap: 38px; }
  .hero-copy { max-width: 640px; }
  .hero-copy h1 { font-size: clamp(44px, 8.2vw, 65px); }
  .hero-lede { max-width: 31em; font-size: 20px; }
  .hero-actions { margin-top: 25px; }
  .hero-product { width: min(100%, 650px); margin-inline: auto; }
  .section { padding-block: 64px; }
  .section h2 { font-size: 36px; }
  .section-lede { font-size: 19px; }
  .workflow-track { grid-auto-columns: calc((100% - 24px) / 2.15); column-gap: 24px; }
  .workflow-step { padding-right: 20px; }
  .workflow-step h3 { font-size: 23px; }
  .workflow-step p { font-size: 16px; }
  .step-number { font-size: 38px; }
  .device-portrait { border-width: 4px; border-radius: 20px; }
  .device-portrait img { border-radius: 14px; }
  .review-grid { gap: 30px; }
  .review blockquote { font-size: 26px; }
  .review-meta { display: block; }
  .review-meta > * { margin-right: 7px; }
  .closing { padding-top: 0; }
}
@media (max-width: 620px) {
  :root { --gutter: 22px; }
  .site-header { min-height: 74px; gap: 12px; }
  .brand { font-size: 21px; letter-spacing: -0.8px; gap: 8px; }
  .brand img { width: 35px; height: 35px; border-radius: 8px; }
  .site-nav { gap: 14px; font-size: 13px; }
  .nav-store { min-height: 39px; padding-inline: 11px; gap: 6px; font-size: 13px; border-radius: 10px; }
  .nav-store .apple-mark { width: 14px; height: 17px; }
  .hero { padding-block: 34px 50px; }
  .hero-inner { gap: 32px; }
  .hero-copy h1 { font-size: clamp(38px, 10.3vw, 58px); line-height: 1.06; }
  .hero-lede { margin-top: 17px; font-size: 18px; line-height: 1.5; }
  .hero-actions { gap: 18px; margin-top: 22px; }
  .hero .store-button { min-height: 55px; font-size: 15px; padding: 14px 18px; }
  .hero .store-button .apple-mark { width: 20px; height: 24px; }
  .hero .text-link { font-size: 15px; }
  .availability { margin-top: 14px; font-size: 13px; }
  .device-landscape { border-width: 5px; border-radius: 18px; box-shadow: 0 16px 25px -17px rgb(15 25 19 / 40%), 0 0 0 1px #72776e; }
  .device-landscape img { border-radius: 12px; }
  .section { padding-block: 48px; }
  .section h2 { font-size: 32px; }
  .section-lede { font-size: 18px; }
  .workflow-track { grid-auto-columns: calc((100% - 18px) / 1.1); column-gap: 18px; margin-top: 28px; }
  .workflow-step { padding-right: 16px; }
  .step-copy { min-height: 210px; }
  .workflow-controls { grid-template-columns: minmax(0, 1fr) auto; gap: 10px; }
  .workflow-drag-hint { font-size: 12px; overflow-wrap: anywhere; }
  .step-number { font-size: 36px; }
  .workflow-step h3 { font-size: 26px; }
  .workflow-step p { max-width: 28em; font-size: 17px; }
  .workflow-step .device-portrait { width: min(100%, 258px); margin-top: 20px; }
  .device-portrait { width: min(100%, 270px); margin-top: 25px; border-width: 5px; border-radius: 26px; }
  .device-portrait img { border-radius: 18px; }
  .device-portrait--tablet { width: min(100%, 340px); border-radius: 18px; }
  .device-portrait--tablet img { border-radius: 11px; }
  .media-caption { text-align: left; margin-top: 28px; font-size: 12px; }
  .review-grid { grid-template-columns: 1fr; gap: 32px; margin-top: 28px; }
  .review blockquote { font-size: 27px; }
  .review-meta { display: flex; }
  .review-meta > * { margin: 0; }
  .review figcaption { margin-top: 15px; font-size: 13px; }
  .review cite { font-size: 17px; }
  .text-link { font-size: 16px; }
  .privacy .section-lede { font-size: 18px; }
  .guide-links { margin-top: 24px; }
  .guide-links a { min-height: 70px; font-size: 18px; }
  .closing { padding-top: 0; }
  .closing .store-button { min-height: 57px; font-size: 16px; padding-inline: 19px; }
  .site-footer { gap: 20px; padding-block: 24px; }
  .footer-nav { order: -1; width: 100%; gap: 24px; padding-top: 0; font-size: 14px; }
  :lang(zh-Hans) .hero-copy h1 { font-size: clamp(35px, 10.2vw, 54px); }
  :lang(zh-Hans) .hero-lede { font-size: 17px; }
}
@media (max-width: 359px) {
  :root { --gutter: 18px; }
  .brand { font-size: 18px; gap: 6px; }
  .brand img { width: 30px; height: 30px; }
  .site-nav { gap: 10px; font-size: 12px; }
  .nav-store { min-height: 36px; padding-inline: 9px; font-size: 12px; }
  .nav-store .apple-mark { display: none; }
  .hero-copy h1 { font-size: 36px; }
  .hero-actions { gap: 17px; }
  .hero .store-button { width: 100%; }
  .section h2 { font-size: 30px; }
}