:root {
  --ink: #0b1f2a;
  --ink-2: #41545f;
  --ink-3: #6b7d87;
  --line: #dfe9ec;
  --bg: #f4f9fa;
  --card: #ffffff;
  --teal: #007aa2;
  --teal-deep: #005f80;
  --aqua: #1fb3ad;
  --amber: #f08a1c;
  --radius: 28px;
  --shadow: 0 1px 2px rgba(11, 31, 42, .04), 0 12px 32px -12px rgba(11, 31, 42, .14);
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", Roboto, "Helvetica Neue", Arial, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 84px; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font);
  font-size: 18px;
  line-height: 1.6;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
h1, h2, h3, p { margin: 0; }
h1, h2, h3 { letter-spacing: -.022em; line-height: 1.1; text-wrap: balance; }
p { text-wrap: pretty; }
:focus-visible { outline: 3px solid var(--aqua); outline-offset: 3px; border-radius: 8px; }

.wrap { width: min(1160px, 100% - 48px); margin-inline: auto; }
.skip { position: absolute; left: 16px; top: -60px; z-index: 100; background: var(--ink); color: #fff; padding: 10px 16px; border-radius: 12px; }
.skip:focus { top: 16px; }

/* Navigation */
.nav { position: sticky; top: 0; z-index: 50; transition: background .25s, box-shadow .25s; }
.nav.scrolled { background: rgba(244, 249, 250, .82); backdrop-filter: saturate(180%) blur(18px); -webkit-backdrop-filter: saturate(180%) blur(18px); box-shadow: 0 1px 0 var(--line); }
.nav-inner { display: flex; align-items: center; gap: 28px; height: 68px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 700; font-size: 1.15rem; letter-spacing: -.02em; }
.brand img { border-radius: 23%; box-shadow: 0 2px 8px rgba(0, 95, 128, .25); }
.nav-links { display: flex; gap: 26px; margin-left: auto; font-size: .95rem; color: var(--ink-2); }
.nav-links a:hover { color: var(--teal); }
.nav-right { display: flex; align-items: center; gap: 14px; }
.lang { display: inline-flex; padding: 3px; border-radius: 999px; background: rgba(11, 31, 42, .06); }
.lang button { font: inherit; font-size: .82rem; font-weight: 600; color: var(--ink-2); border: 0; background: none; padding: 5px 12px; border-radius: 999px; cursor: pointer; }
.lang button[aria-pressed="true"] { background: #fff; color: var(--ink); box-shadow: 0 1px 3px rgba(11, 31, 42, .14); }
.btn { display: inline-flex; align-items: center; justify-content: center; font-weight: 600; color: #fff; background: var(--teal); border-radius: 999px; padding: 14px 26px; transition: background .2s, transform .2s; }
.btn:hover { background: var(--teal-deep); transform: translateY(-1px); }
.btn-small { padding: 9px 18px; font-size: .92rem; }

/* Hero */
.hero { position: relative; overflow: hidden; padding: 56px 0 96px; margin-top: -68px; padding-top: 124px; }
.glow { position: absolute; border-radius: 50%; filter: blur(90px); pointer-events: none; }
.glow-a { width: 620px; height: 620px; right: -140px; top: -180px; background: rgba(31, 179, 173, .30); }
.glow-b { width: 520px; height: 520px; left: -220px; top: 240px; background: rgba(0, 122, 162, .16); }
.hero-grid { position: relative; display: grid; grid-template-columns: 1.05fr .95fr; gap: 48px; align-items: center; }
.eyebrow { display: inline-flex; align-items: center; gap: 10px; font-size: .88rem; font-weight: 600; color: var(--teal-deep); background: rgba(0, 122, 162, .09); padding: 7px 14px; border-radius: 999px; }
.dot { width: 8px; height: 8px; border-radius: 50%; background: var(--aqua); box-shadow: 0 0 0 4px rgba(31, 179, 173, .22); }
h1 { font-size: clamp(2.6rem, 5.6vw, 4.5rem); font-weight: 800; margin-top: 22px; letter-spacing: -.025em; line-height: 1.04; word-spacing: .04em; }
.lede { margin-top: 24px; font-size: clamp(1.1rem, 1.5vw, 1.3rem); color: var(--ink-2); max-width: 34em; }
:lang(zh-Hans) h1 { font-size: clamp(2rem, 4.6vw, 3.6rem); line-height: 1.18; letter-spacing: -.01em; }
:lang(zh-Hans) h2, :lang(zh-Hans) h3 { line-height: 1.25; letter-spacing: 0; }
:lang(zh-Hans) .kicker { letter-spacing: .16em; }
.hero-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 22px; margin-top: 36px; }
.store { display: inline-flex; align-items: center; gap: 12px; padding: 11px 22px 11px 18px; border-radius: 16px; background: var(--ink); color: #fff; line-height: 1.15; }
.store small { display: block; font-size: .72rem; opacity: .78; }
.store b { font-size: 1.2rem; font-weight: 600; letter-spacing: -.01em; }
.store-light { background: #fff; color: var(--ink); }
.link-arrow { font-weight: 600; color: var(--teal); }
.link-arrow:hover { color: var(--teal-deep); }
.hero-points { list-style: none; padding: 0; margin: 40px 0 0; display: flex; flex-wrap: wrap; gap: 10px 26px; font-size: .95rem; color: var(--ink-2); }
.hero-points li { display: inline-flex; align-items: center; gap: 8px; }
.hero-points li::before { content: ""; width: 18px; height: 18px; flex: none; background: var(--aqua); -webkit-mask: var(--tick) center / contain no-repeat; mask: var(--tick) center / contain no-repeat; }
:root { --tick: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20'%3E%3Cpath fill-rule='evenodd' d='M10 18a8 8 0 100-16 8 8 0 000 16zm3.7-9.3a1 1 0 00-1.4-1.4L9 10.6 7.7 9.3a1 1 0 00-1.4 1.4l2 2a1 1 0 001.4 0l4-4z'/%3E%3C/svg%3E"); }

/* Phones */
.phone { width: 300px; padding: 9px; border-radius: 50px; background: linear-gradient(160deg, #1b2f3a, #050d12); box-shadow: 0 0 0 1px rgba(255, 255, 255, .08) inset, 0 40px 70px -28px rgba(0, 60, 82, .5), 0 18px 30px -18px rgba(11, 31, 42, .4); }
.phone img { border-radius: 41px; width: 100%; }
.hero-art { position: relative; height: 640px; }
.hero-art .phone { position: absolute; }
.phone-front { left: 4%; top: 0; z-index: 2; animation: float 9s ease-in-out infinite; }
.phone-back { right: 0; top: 70px; width: 270px; transform: rotate(6deg); opacity: .96; animation: float 9s ease-in-out -4.5s infinite; }
@keyframes float { 0%, 100% { translate: 0 0; } 50% { translate: 0 -12px; } }

/* Statement */
.why { padding: 40px 0 24px; }
.why-text { font-size: clamp(1.5rem, 3.1vw, 2.5rem); line-height: 1.28; letter-spacing: -.025em; font-weight: 600; color: var(--ink-3); max-width: 22em; }
.why-text strong { color: var(--ink); font-weight: 700; }
.why-text em { font-style: normal; color: var(--teal); }

/* Sections */
.section { padding: 96px 0; }
.alt { background: #fff; border-block: 1px solid var(--line); }
.alt > .wrap { width: min(1160px, 100% - 48px); }
.head { max-width: 760px; margin-bottom: 52px; }
.kicker { font-size: .85rem; font-weight: 700; letter-spacing: .09em; text-transform: uppercase; color: var(--teal); margin-bottom: 14px; }
h2 { font-size: clamp(2rem, 4vw, 3.1rem); font-weight: 800; letter-spacing: -.022em; word-spacing: .04em; }
.sub { margin-top: 18px; font-size: 1.15rem; color: var(--ink-2); }

.bento { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 32px; box-shadow: var(--shadow); transition: transform .3s, box-shadow .3s; }
.card:hover { transform: translateY(-4px); box-shadow: 0 1px 2px rgba(11, 31, 42, .04), 0 24px 48px -18px rgba(0, 95, 128, .24); }
.card-wide { grid-column: span 2; }
.card h3 { font-size: 1.32rem; font-weight: 700; margin: 22px 0 10px; }
.card p { color: var(--ink-2); font-size: 1rem; }
.icon { width: 52px; height: 52px; border-radius: 16px; display: grid; place-items: center; background: linear-gradient(140deg, var(--teal), var(--aqua)); box-shadow: 0 8px 18px -8px rgba(0, 122, 162, .6); }
.icon svg { width: 28px; height: 28px; fill: none; stroke: #fff; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }

/* How it works */
.row { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: center; padding: 40px 0; }
.row-flip .row-art { order: 2; }
.row-art { display: grid; place-items: center; position: relative; }
.row-art::before { content: ""; position: absolute; width: 78%; aspect-ratio: 1; border-radius: 50%; background: radial-gradient(closest-side, rgba(31, 179, 173, .2), transparent); }
.row-art .phone, .shot { position: relative; }
.shot { margin: 0; width: min(460px, 100%); border-radius: 32px; overflow: hidden; border: 1px solid var(--line); box-shadow: 0 40px 70px -30px rgba(0, 60, 82, .4); }
.step { display: inline-grid; place-items: center; width: 44px; height: 44px; border-radius: 50%; font-weight: 700; color: var(--teal); background: rgba(0, 122, 162, .1); }
.row-copy h3 { font-size: clamp(1.7rem, 2.8vw, 2.3rem); font-weight: 800; margin: 20px 0 14px; letter-spacing: -.02em; word-spacing: .04em; }
.row-copy p { color: var(--ink-2); font-size: 1.1rem; max-width: 30em; }
.ticks { list-style: none; padding: 0; margin: 26px 0 0; display: grid; gap: 12px; max-width: 32em; }
.ticks li { position: relative; padding-left: 32px; font-size: 1rem; }
.ticks li::before { content: ""; position: absolute; left: 0; top: .22em; width: 20px; height: 20px; background: var(--aqua); -webkit-mask: var(--tick) center / contain no-repeat; mask: var(--tick) center / contain no-repeat; }

/* Privacy */
.privacy { padding: 104px 0; color: #eaf4f6; background: radial-gradient(900px 500px at 85% -10%, rgba(31, 179, 173, .32), transparent 60%), radial-gradient(700px 500px at -5% 110%, rgba(0, 122, 162, .45), transparent 60%), #071922; }
.privacy .kicker { color: #6fe0d6; }
.privacy .sub { color: #a9c3cb; }
.pgrid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.pcard { padding: 32px; border-radius: var(--radius); background: rgba(255, 255, 255, .055); border: 1px solid rgba(255, 255, 255, .11); backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px); }
.pcard h3 { font-size: 1.25rem; font-weight: 700; margin-bottom: 14px; color: #fff; }
.pcard p { color: #b9d0d6; font-size: 1rem; }

/* FAQ */
.faq { max-width: 820px; border-top: 1px solid var(--line); }
.faq details { border-bottom: 1px solid var(--line); }
.faq summary { list-style: none; cursor: pointer; display: flex; justify-content: space-between; align-items: center; gap: 24px; padding: 24px 0; font-size: 1.2rem; font-weight: 600; letter-spacing: -.01em; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: ""; flex: none; width: 14px; height: 14px; border-right: 2px solid var(--teal); border-bottom: 2px solid var(--teal); transform: rotate(45deg) translate(-3px, -3px); transition: transform .25s; }
.faq details[open] summary::after { transform: rotate(-135deg) translate(-3px, -3px); }
.faq details p { padding: 0 40px 26px 0; color: var(--ink-2); }

/* Call to action */
.cta { padding: 0 0 96px; }
.cta-inner { text-align: center; color: #fff; border-radius: 40px; padding: 72px 28px; background: linear-gradient(135deg, #006b9e 0%, #0d8fa6 55%, #1fb3ad 100%); box-shadow: 0 40px 80px -40px rgba(0, 95, 128, .7); display: grid; justify-items: center; }
.cta-inner > img { border-radius: 23%; box-shadow: 0 16px 36px -12px rgba(0, 40, 56, .55); }
.cta-inner h2 { margin-top: 28px; max-width: 17em; }
.cta-inner p { margin: 16px 0 32px; font-size: 1.15rem; opacity: .9; }

/* Footer */
.footer { border-top: 1px solid var(--line); padding: 36px 0 48px; }
.footer-inner { display: grid; grid-template-columns: auto 1fr auto; gap: 32px; align-items: center; }
.fine { font-size: .85rem; color: var(--ink-3); }

/* Motion */
.reveal { transition: opacity .7s cubic-bezier(.2, .7, .2, 1), transform .7s cubic-bezier(.2, .7, .2, 1); }
.js .reveal:not(.in) { opacity: 0; transform: translateY(22px); }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .js .reveal:not(.in) { opacity: 1; transform: none; }
  .reveal { transition: none; }
  .phone-front, .phone-back { animation: none; }
  .card, .btn { transition: none; }
}

/* Responsive */
@media (max-width: 980px) {
  .nav-links { display: none; }
  .nav-right { margin-left: auto; }
  .hero-grid { grid-template-columns: 1fr; }
  .hero-art { height: 560px; max-width: 520px; width: 100%; margin: 12px auto 0; }
  .hero-art .phone-front { width: 260px; left: 2%; }
  .hero-art .phone-back { width: 232px; }
  .bento, .pgrid { grid-template-columns: 1fr 1fr; }
  .card-wide { grid-column: auto; }
  .pgrid .pcard:last-child { grid-column: span 2; }
  .row { grid-template-columns: 1fr; gap: 36px; }
  .row-flip .row-art { order: 0; }
  .footer-inner { grid-template-columns: 1fr; gap: 14px; }
}
@media (max-width: 640px) {
  body { font-size: 17px; }
  .wrap, .alt > .wrap { width: calc(100% - 40px); }
  .btn-small { display: none; }
  .hero { padding-bottom: 64px; }
  .hero-art { height: 470px; }
  .hero-art .phone-front { width: 216px; left: 0; }
  .hero-art .phone-back { width: 190px; top: 56px; }
  .phone { border-radius: 40px; padding: 7px; }
  .phone img { border-radius: 33px; }
  .row-art .phone { width: 260px; }
  .section { padding: 68px 0; }
  .privacy { padding: 76px 0; }
  .bento, .pgrid { grid-template-columns: 1fr; }
  .pgrid .pcard:last-child { grid-column: auto; }
  .card, .pcard { padding: 26px; }
  .cta-inner { padding: 56px 22px; border-radius: 32px; }
}