:root {
  --ink: #171c1d;
  --muted: #677174;
  --soft: #92999b;
  --teal: #14868c;
  --teal-dark: #0d4b4f;
  --paper: #f6f7f6;
  --white: #ffffff;
  --line: #dde1e0;
  --dark: #0d2f32;
  --page: min(1180px, calc(100vw - 48px));
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "SF Pro Display", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background: var(--paper);
  font-synthesis: none;
  text-rendering: optimizeLegibility;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; min-width: 320px; overflow-x: hidden; background: var(--paper); }
body.menu-open { overflow: hidden; }
a { color: inherit; text-decoration: none; }
button { font: inherit; }
img { display: block; max-width: 100%; }

.skip-link { position: fixed; z-index: 1000; top: -100px; left: 16px; padding: 11px 16px; border-radius: 8px; background: white; box-shadow: 0 8px 30px rgba(0,0,0,.12); }
.skip-link:focus { top: 16px; }

.site-header { position: fixed; z-index: 100; inset: 0 0 auto; border-bottom: 1px solid transparent; background: rgba(246,247,246,.92); backdrop-filter: blur(18px); transition: border-color .2s ease; }
.site-header.scrolled { border-color: rgba(23,28,29,.1); }
.nav-shell { display: flex; align-items: center; justify-content: space-between; width: var(--page); height: 76px; margin: auto; }
.brand { display: flex; align-items: center; gap: 10px; }
.brand img { border-radius: 10px; }
.brand span, .footer-brand span { display: grid; line-height: 1; }
.brand strong { font-size: 16px; letter-spacing: -.02em; }
.brand small { margin-top: 5px; color: var(--muted); font-size: 9px; letter-spacing: .14em; }
.desktop-nav { display: flex; gap: 32px; color: #4f595b; font-size: 13px; }
.desktop-nav a, .text-link { transition: color .2s ease; }
.desktop-nav a:hover, .text-link:hover { color: var(--teal); }
.nav-action { padding: 10px 14px; border: 1px solid #cbd1d0; border-radius: 8px; font-size: 12px; font-weight: 650; }
.menu-button, .mobile-nav { display: none; }

.hero { display: grid; grid-template-columns: minmax(0, 1.08fr) minmax(360px, .92fr); align-items: center; gap: 70px; width: var(--page); min-height: 880px; margin: auto; padding: 130px 0 70px; }
.hero-copy { max-width: 660px; }
.overline { margin: 0 0 24px; color: var(--teal); font-size: 11px; font-weight: 750; letter-spacing: .16em; text-transform: uppercase; }
.overline.light { color: #83c9c8; }
.hero h1 { margin: 0; font-size: clamp(52px, 5.4vw, 78px); font-weight: 700; line-height: 1.08; letter-spacing: -.055em; }
.hero-description { max-width: 590px; margin: 30px 0 0; color: var(--muted); font-size: 17px; line-height: 1.8; }
.hero-actions { display: flex; align-items: center; gap: 26px; margin-top: 36px; }
.button { display: inline-flex; min-height: 48px; align-items: center; justify-content: center; padding: 0 21px; border-radius: 9px; font-size: 13px; font-weight: 720; transition: transform .2s ease, background .2s ease; }
.button:hover { transform: translateY(-1px); }
.button-primary { color: white; background: var(--teal); }
.button-primary:hover { background: #0f7479; }
.text-link { color: #3e494b; font-size: 13px; font-weight: 650; }
.text-link span { margin-left: 6px; }
.disclaimer { margin: 25px 0 0; color: var(--soft); font-size: 10px; }
.hero-product { display: grid; justify-items: center; }
.hero-product > p { margin: 18px 0 0; color: var(--soft); font-size: 9px; letter-spacing: .08em; }
.device-frame { position: relative; overflow: hidden; width: 300px; border: 8px solid #15191a; border-radius: 49px; background: #15191a; box-shadow: 0 24px 65px rgba(20,42,43,.16); }
.device-frame img { width: 100%; height: auto; border-radius: 39px; }
.device-frame-hero { width: 348px; border-width: 9px; border-radius: 57px; box-shadow: 0 35px 90px rgba(20,42,43,.2); }
.device-frame-hero img { border-radius: 45px; }

.product-index { display: grid; grid-template-columns: repeat(4,1fr); width: var(--page); margin: auto; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.product-index > div { display: grid; gap: 5px; min-height: 118px; align-content: center; padding: 20px 26px; border-right: 1px solid var(--line); }
.product-index > div:first-child { padding-left: 0; }
.product-index > div:last-child { border-right: 0; }
.product-index span { color: var(--teal); font-size: 9px; font-weight: 750; }
.product-index strong { font-size: 14px; }
.product-index small { color: var(--muted); font-size: 10px; }

.section { width: var(--page); margin: auto; padding: 130px 0; }
.section-intro { max-width: 730px; }
.section-intro h2, .alerts-heading h2, .boundaries-shell h2, .availability-content h2 { margin: 0; font-size: clamp(42px, 5vw, 66px); line-height: 1.1; letter-spacing: -.052em; }
.section-intro > p:last-child { max-width: 620px; margin: 24px 0 0; color: var(--muted); font-size: 15px; line-height: 1.8; }

.screen-grid { display: grid; gap: 22px; margin-top: 70px; }
.screen-card { display: grid; grid-template-columns: 1fr 390px; align-items: center; min-height: 680px; padding: 56px 68px; border: 1px solid var(--line); border-radius: 24px; background: #ecefee; }
.screen-card:nth-child(even) { grid-template-columns: 390px 1fr; background: #eef5f4; }
.screen-card:nth-child(even) .screen-copy { order: 2; }
.screen-card:nth-child(even) .device-frame { order: 1; }
.screen-copy { max-width: 520px; }
.screen-copy > span { color: var(--teal); font-size: 10px; font-weight: 750; letter-spacing: .12em; }
.screen-copy h3 { margin: 18px 0 17px; font-size: clamp(31px, 3.5vw, 46px); line-height: 1.15; letter-spacing: -.045em; }
.screen-copy p { margin: 0; color: var(--muted); font-size: 14px; line-height: 1.8; }
.screen-copy ul { display: grid; gap: 10px; margin: 28px 0 0; padding: 0; color: #3f4a4c; font-size: 12px; list-style: none; }
.screen-copy li::before { content: "—"; margin-right: 10px; color: var(--teal); }
.screen-card .device-frame { justify-self: center; width: 278px; border-radius: 46px; }
.screen-card .device-frame img { border-radius: 36px; }

.alerts-section { color: white; background: var(--dark); }
.alerts-shell { width: var(--page); margin: auto; padding: 130px 0; }
.alerts-heading { display: grid; grid-template-columns: 1.2fr .8fr; gap: 80px; align-items: end; }
.alerts-heading .overline { grid-column: 1 / -1; margin-bottom: -45px; }
.alerts-heading > p:last-child { margin: 0 0 8px; color: rgba(255,255,255,.58); font-size: 14px; line-height: 1.85; }
.alert-process { display: grid; grid-template-columns: repeat(3,1fr); margin-top: 86px; border-top: 1px solid rgba(255,255,255,.16); border-bottom: 1px solid rgba(255,255,255,.16); }
.alert-process > div { min-height: 265px; padding: 30px 34px 30px 0; border-right: 1px solid rgba(255,255,255,.16); }
.alert-process > div + div { padding-left: 34px; }
.alert-process > div:last-child { border-right: 0; }
.alert-process span { color: #83c9c8; font-size: 9px; font-weight: 750; }
.alert-process strong { display: block; margin-top: 90px; font-size: 19px; }
.alert-process p { margin: 12px 0 0; color: rgba(255,255,255,.52); font-size: 12px; line-height: 1.7; }
.terminology { display: grid; grid-template-columns: 140px 1fr; gap: 30px; margin-top: 35px; }
.terminology span { color: #83c9c8; font-size: 10px; font-weight: 750; }
.terminology p { margin: 0; color: rgba(255,255,255,.55); font-size: 11px; line-height: 1.8; }

.section-intro.split { display: grid; grid-template-columns: 1.2fr .8fr; gap: 80px; max-width: none; align-items: end; }
.section-intro.split > p:last-child { margin: 0 0 7px; }
.fact-list { margin-top: 75px; border-top: 1px solid var(--line); }
.fact { display: grid; grid-template-columns: 100px 1fr; min-height: 150px; align-items: center; border-bottom: 1px solid var(--line); }
.fact > span { color: var(--teal); font-size: 10px; font-weight: 750; }
.fact > div { display: grid; grid-template-columns: .8fr 1.2fr; gap: 70px; align-items: baseline; }
.fact h3 { margin: 0; font-size: 20px; letter-spacing: -.02em; }
.fact p { margin: 0; color: var(--muted); font-size: 12px; line-height: 1.75; }
.section-link { display: inline-flex; align-items: center; gap: 8px; margin-top: 34px; color: var(--teal); font-size: 12px; font-weight: 700; }
.section-link span { transition: transform .2s ease; }
.section-link:hover span { transform: translateX(3px); }

.boundaries-section { width: calc(100% - 48px); max-width: 1380px; margin: 0 auto; color: white; background: #162124; }
.boundaries-shell { width: min(1080px, calc(100% - 80px)); margin: auto; padding: 110px 0; }
.boundary-grid { display: grid; grid-template-columns: repeat(3,1fr); margin-top: 75px; border-top: 1px solid rgba(255,255,255,.15); }
.boundary-grid > div { min-height: 170px; padding: 28px 28px 0 0; border-right: 1px solid rgba(255,255,255,.15); }
.boundary-grid > div + div { padding-left: 28px; }
.boundary-grid > div:last-child { border-right: 0; }
.boundary-grid strong { font-size: 15px; }
.boundary-grid p { margin: 50px 0 0; color: rgba(255,255,255,.52); font-size: 11px; }

.faq-section { display: grid; grid-template-columns: .75fr 1.25fr; gap: 100px; }
.faq-heading h2 { margin: 0; font-size: 48px; letter-spacing: -.045em; }
.faq-list { border-top: 1px solid var(--line); }
.faq-list details { border-bottom: 1px solid var(--line); }
.faq-list summary { display: flex; min-height: 79px; align-items: center; justify-content: space-between; cursor: pointer; font-size: 14px; font-weight: 650; list-style: none; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary span { color: var(--teal); font-size: 18px; font-weight: 400; transition: transform .2s ease; }
.faq-list details[open] summary span { transform: rotate(45deg); }
.faq-list details p { margin: -2px 55px 27px 0; color: var(--muted); font-size: 12px; line-height: 1.8; }

.availability-section { display: grid; min-height: 670px; place-items: center; padding: 90px 24px; text-align: center; color: white; background: var(--dark); }
.availability-content { display: grid; justify-items: center; }
.availability-content img { margin-bottom: 24px; border-radius: 18px; }
.availability-content .overline { margin-bottom: 21px; }
.availability-content > p:nth-last-of-type(1) { margin: 23px 0 28px; color: rgba(255,255,255,.55); font-size: 13px; }
.button-light { color: var(--dark); background: white; }

footer { display: grid; grid-template-columns: auto 1fr auto; gap: 40px; align-items: center; padding: 28px max(24px, calc((100vw - 1180px) / 2)); color: rgba(255,255,255,.43); background: #081d1f; font-size: 9px; }
.footer-brand { display: flex; align-items: center; gap: 9px; color: white; }
.footer-brand img { border-radius: 8px; }
.footer-brand strong { font-size: 12px; }
.footer-brand small { margin-top: 4px; color: rgba(255,255,255,.4); font-size: 7px; letter-spacing: .12em; }
footer p { text-align: center; }
.footer-meta { display: flex; align-items: center; justify-content: flex-end; gap: 18px; }
.footer-meta a { color: rgba(255,255,255,.72); transition: color .2s ease; }
.footer-meta a:hover { color: white; }

.policy-page { width: min(920px, calc(100vw - 48px)); margin: auto; padding: 170px 0 120px; }
.policy-hero { max-width: 760px; }
.policy-hero h1 { margin: 0; font-size: clamp(52px, 7vw, 78px); line-height: 1.05; letter-spacing: -.055em; }
.policy-hero > p:nth-of-type(2) { max-width: 700px; margin: 28px 0 0; color: var(--muted); font-size: 16px; line-height: 1.8; }
.policy-hero time { display: block; margin-top: 22px; color: var(--soft); font-size: 10px; }
.policy-summary { display: grid; grid-template-columns: repeat(3,1fr); margin-top: 70px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.policy-summary > div { min-height: 165px; padding: 28px 28px 24px 0; border-right: 1px solid var(--line); }
.policy-summary > div + div { padding-left: 28px; }
.policy-summary > div:last-child { border-right: 0; }
.policy-summary span, .policy-content > section > span { color: var(--teal); font-size: 9px; font-weight: 750; }
.policy-summary strong { display: block; margin-top: 40px; font-size: 15px; }
.policy-summary p { margin: 8px 0 0; color: var(--muted); font-size: 10px; line-height: 1.6; }
.policy-content { margin-top: 75px; border-top: 1px solid var(--line); }
.policy-content > section { display: grid; grid-template-columns: 90px 1fr; gap: 30px; padding: 42px 0; border-bottom: 1px solid var(--line); }
.policy-content h2 { margin: 0; font-size: 22px; letter-spacing: -.025em; }
.policy-content p { margin: 14px 0 0; color: var(--muted); font-size: 13px; line-height: 1.9; }
.policy-back { margin-top: 54px; }
.policy-footer { grid-template-columns: auto 1fr auto; }

.reveal { opacity: 0; transform: translateY(14px); transition: opacity .55s ease, transform .55s ease; }
.reveal.is-visible { opacity: 1; transform: none; }

@media (max-width: 980px) {
  .desktop-nav { gap: 20px; }
  .hero { grid-template-columns: 1fr 340px; gap: 40px; }
  .device-frame-hero { width: 310px; }
  .screen-card, .screen-card:nth-child(even) { grid-template-columns: 1fr 330px; padding: 48px; }
  .screen-card:nth-child(even) .screen-copy { order: 1; }
  .screen-card:nth-child(even) .device-frame { order: 2; }
  .alerts-heading, .section-intro.split { gap: 45px; }
}

@media (max-width: 780px) {
  :root { --page: min(100% - 36px, 680px); }
  .desktop-nav, .nav-action { display: none; }
  .menu-button { display: grid; width: 40px; height: 40px; place-content: center; gap: 6px; border: 1px solid var(--line); border-radius: 8px; background: transparent; }
  .menu-button span { display: block; width: 17px; height: 1px; background: var(--ink); transition: .2s ease; }
  .menu-button[aria-expanded="true"] span:first-child { transform: translateY(3.5px) rotate(45deg); }
  .menu-button[aria-expanded="true"] span:last-child { transform: translateY(-3.5px) rotate(-45deg); }
  .mobile-nav { position: fixed; inset: 68px 18px auto; display: grid; visibility: hidden; gap: 2px; padding: 10px; opacity: 0; transform: translateY(-7px); border: 1px solid var(--line); border-radius: 12px; background: rgba(255,255,255,.98); box-shadow: 0 16px 45px rgba(23,28,29,.12); transition: .2s ease; }
  .mobile-nav.open { visibility: visible; opacity: 1; transform: none; }
  .mobile-nav a { padding: 13px; border-radius: 7px; font-size: 13px; }
  .mobile-nav a:hover { background: var(--paper); }
  .hero { grid-template-columns: 1fr; gap: 65px; min-height: auto; padding: 150px 0 90px; text-align: center; }
  .hero-copy { margin: auto; }
  .hero-description { margin-right: auto; margin-left: auto; }
  .hero-actions { justify-content: center; }
  .device-frame-hero { width: 330px; }
  .product-index { grid-template-columns: repeat(2,1fr); }
  .product-index > div { border-bottom: 1px solid var(--line); }
  .product-index > div:nth-child(2) { border-right: 0; }
  .product-index > div:nth-child(n+3) { border-bottom: 0; }
  .product-index > div:first-child { padding-left: 26px; }
  .section { padding: 100px 0; }
  .screen-card, .screen-card:nth-child(even) { grid-template-columns: 1fr; gap: 50px; padding: 50px 30px; text-align: center; }
  .screen-card .screen-copy, .screen-card:nth-child(even) .screen-copy { order: 1; margin: auto; }
  .screen-card .device-frame, .screen-card:nth-child(even) .device-frame { order: 2; }
  .screen-copy ul { justify-items: center; }
  .alerts-heading, .section-intro.split { grid-template-columns: 1fr; gap: 28px; }
  .alerts-heading .overline { grid-column: auto; margin-bottom: -5px; }
  .alert-process { grid-template-columns: 1fr; }
  .alert-process > div, .alert-process > div + div { min-height: auto; padding: 28px 0; border-right: 0; border-bottom: 1px solid rgba(255,255,255,.14); }
  .alert-process > div:last-child { border-bottom: 0; }
  .alert-process strong { margin-top: 34px; }
  .fact > div { grid-template-columns: 1fr; gap: 10px; }
  .faq-section { grid-template-columns: 1fr; gap: 45px; }
  footer { grid-template-columns: 1fr; gap: 11px; text-align: center; }
  .footer-brand { justify-content: center; }
  .footer-meta { justify-content: center; }
  .policy-summary { grid-template-columns: 1fr; }
  .policy-summary > div, .policy-summary > div + div { min-height: auto; padding: 24px 0; border-right: 0; border-bottom: 1px solid var(--line); }
  .policy-summary > div:last-child { border-bottom: 0; }
  .policy-summary strong { margin-top: 24px; }
  .policy-footer { grid-template-columns: 1fr; }
}

@media (max-width: 520px) {
  :root { --page: calc(100% - 28px); }
  .nav-shell { height: 68px; }
  .hero { padding-top: 122px; }
  .hero h1 { font-size: 45px; }
  .hero-description { font-size: 15px; }
  .hero-actions { flex-direction: column; gap: 18px; }
  .device-frame-hero { width: min(310px, 90vw); }
  .product-index { grid-template-columns: 1fr; }
  .product-index > div, .product-index > div:first-child { min-height: 105px; padding-left: 8px; border-right: 0; border-bottom: 1px solid var(--line); }
  .product-index > div:nth-child(n+3) { border-bottom: 1px solid var(--line); }
  .product-index > div:last-child { border-bottom: 0; }
  .section-intro h2, .alerts-heading h2, .boundaries-shell h2, .availability-content h2 { font-size: 39px; }
  .screen-grid { margin-top: 48px; }
  .screen-card, .screen-card:nth-child(even) { padding: 38px 18px; border-radius: 18px; }
  .screen-card .device-frame { width: min(270px, 82vw); }
  .alerts-shell { padding: 95px 0; }
  .terminology { grid-template-columns: 1fr; gap: 12px; }
  .fact { grid-template-columns: 45px 1fr; min-height: 165px; }
  .boundaries-section { width: calc(100% - 28px); }
  .boundaries-shell { width: calc(100% - 40px); padding: 80px 0; }
  .boundary-grid { grid-template-columns: 1fr; }
  .boundary-grid > div, .boundary-grid > div + div { min-height: auto; padding: 25px 0; border-right: 0; border-bottom: 1px solid rgba(255,255,255,.15); }
  .boundary-grid > div:last-child { border-bottom: 0; }
  .boundary-grid p { margin-top: 20px; }
  .availability-section { min-height: 610px; }
  .policy-page { width: calc(100% - 28px); padding: 130px 0 90px; }
  .policy-hero h1 { font-size: 48px; }
  .policy-hero > p:nth-of-type(2) { font-size: 14px; }
  .policy-content > section { grid-template-columns: 35px 1fr; gap: 15px; padding: 34px 0; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
  .reveal { opacity: 1; transform: none; }
}