:root {
  --bg: #f5f7fb;
  --surface: #ffffff;
  --ink: #172033;
  --muted: #56647a;
  --primary: #2e5ce6;
  --primary-dark: #2449b8;
  --primary-soft: #e9efff;
  --green: #16875b;
  --green-soft: #e7f7f0;
  --border: #d6deea;
  --navy: #14213d;
  --shadow: 0 24px 65px rgba(31, 52, 93, .13);
  --radius: 22px;
  --font: "Microsoft YaHei UI", "Microsoft YaHei", "Segoe UI", system-ui, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--bg);
  font: 400 18px/1.65 var(--font);
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
.shell { width: min(1160px, calc(100% - 48px)); margin-inline: auto; }
.skip-link { position: fixed; z-index: 999; top: 10px; left: 10px; padding: 12px 18px; border-radius: 9px; color: #fff; background: var(--navy); transform: translateY(-150%); }
.skip-link:focus { transform: none; }

.site-header { position: relative; z-index: 20; border-bottom: 1px solid rgba(214, 222, 234, .8); background: rgba(245, 247, 251, .92); backdrop-filter: blur(14px); }
.header-inner { min-height: 80px; display: flex; align-items: center; justify-content: space-between; gap: 30px; }
.brand { display: inline-flex; align-items: center; gap: 12px; text-decoration: none; font-weight: 700; font-size: 20px; letter-spacing: -.02em; }
.brand-mark { position: relative; width: 38px; height: 30px; display: inline-block; }
.brand-mark span { position: absolute; top: 3px; width: 24px; height: 18px; border: 3px solid var(--primary); border-radius: 4px; background: var(--bg); }
.brand-mark span:first-child { left: 0; }
.brand-mark span:last-child { right: 0; top: 9px; background: #fff; }
.site-header nav { display: flex; align-items: center; gap: 30px; }
.site-header nav a { color: var(--muted); text-decoration: none; font-size: 16px; font-weight: 600; }
.site-header nav a:hover { color: var(--primary); }

.hero { position: relative; overflow: hidden; padding: 85px 0 94px; background: radial-gradient(circle at 80% 20%, #e4ecff 0, rgba(228,236,255,0) 33%), linear-gradient(180deg, #f8faff 0%, var(--bg) 100%); }
.hero::before { content: ""; position: absolute; right: -160px; top: -240px; width: 600px; height: 600px; border: 1px solid rgba(46,92,230,.08); border-radius: 50%; box-shadow: 0 0 0 90px rgba(46,92,230,.025), 0 0 0 180px rgba(46,92,230,.018); }
.hero-grid { display: grid; grid-template-columns: 1.02fr .98fr; gap: 80px; align-items: center; }
.eyebrow { margin: 0 0 18px; color: var(--primary); font-size: 16px; font-weight: 700; letter-spacing: .025em; text-transform: uppercase; }
.status-dot { display: inline-block; width: 9px; height: 9px; margin-right: 9px; border-radius: 50%; background: var(--green); box-shadow: 0 0 0 5px rgba(22,135,91,.12); }
h1, h2, h3 { margin-top: 0; line-height: 1.16; letter-spacing: -.035em; }
h1 { margin-bottom: 26px; font-size: clamp(44px, 5.25vw, 64px); font-weight: 750; }
h1 span { color: var(--primary); }
.hero-lede { max-width: 650px; margin: 0 0 30px; color: var(--muted); font-size: 20px; line-height: 1.68; }
.hero-lede strong { color: var(--ink); }
.hero-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 22px; }
.button { min-height: 56px; display: inline-flex; align-items: center; justify-content: center; gap: 10px; padding: 14px 23px; border: 2px solid transparent; border-radius: 12px; text-decoration: none; font-size: 18px; font-weight: 700; line-height: 1.2; transition: transform .18s ease, background .18s ease, border-color .18s ease, box-shadow .18s ease; }
.button:hover { transform: translateY(-2px); }
.button:focus-visible, .text-link:focus-visible, nav a:focus-visible, summary:focus-visible { outline: 3px solid #7da2ff; outline-offset: 3px; }
.button svg { width: 23px; height: 23px; fill: none; stroke: currentColor; stroke-linecap: round; stroke-linejoin: round; stroke-width: 2; }
.button-primary { color: #fff; background: var(--primary); box-shadow: 0 12px 24px rgba(46,92,230,.24); }
.button-primary:hover { background: var(--primary-dark); box-shadow: 0 16px 28px rgba(46,92,230,.29); }
.text-link { color: var(--primary); text-decoration: none; font-weight: 700; }
.text-link:hover { text-decoration: underline; text-underline-offset: 4px; }
.download-meta { margin: 17px 0 0; color: var(--muted); font-size: 16px; }
.download-meta strong { color: var(--ink); }
.download-meta #package-size:not(:empty)::before { content: " · "; }
.reassurance { max-width: 590px; margin: 16px 0 0; padding: 13px 16px; border-left: 4px solid var(--green); border-radius: 0 8px 8px 0; color: #356251; background: var(--green-soft); font-size: 16px; }

.hero-visual { position: relative; min-height: 500px; }
.device { position: absolute; z-index: 2; text-align: center; color: var(--muted); font-size: 15px; font-weight: 650; }
.device p { margin: 9px 0 0; }
.device-screen { overflow: hidden; border: 5px solid #273957; border-radius: 12px; background: #f5f8ff; box-shadow: 0 22px 40px rgba(24,43,79,.16); }
.device-laptop { left: 0; top: 95px; }
.device-laptop .device-screen { width: 190px; height: 125px; }
.device-desktop { right: 0; top: 29px; }
.device-desktop .device-screen { width: 224px; height: 150px; }
.mini-top { height: 24px; display: flex; gap: 5px; padding: 8px; background: #dce5fa; }
.mini-top i { width: 6px; height: 6px; border-radius: 50%; background: #9caccc; }
.mini-lines { padding: 18px; }
.mini-lines b { display: block; height: 8px; margin-bottom: 11px; border-radius: 8px; background: #d2def5; }
.mini-lines b:nth-child(1) { width: 70%; background: #7d9ce9; }
.mini-lines b:nth-child(2) { width: 88%; }
.mini-lines b:nth-child(3) { width: 56%; }
.mini-window { width: 72%; height: 75px; margin: 18px auto 0; border-radius: 8px; background: linear-gradient(135deg, #90aaf0, #476ddd); box-shadow: inset 0 0 0 9px rgba(255,255,255,.32); }
.laptop-base { width: 218px; height: 13px; margin-left: -14px; border-radius: 3px 3px 10px 10px; background: #344764; }
.desktop-stand { position: relative; width: 65px; height: 32px; margin: 0 auto; border-bottom: 9px solid #344764; }
.desktop-stand::before { content: ""; position: absolute; width: 10px; height: 26px; left: 27px; background: #344764; }
.connection-line { position: absolute; z-index: 1; left: 168px; right: 170px; top: 192px; height: 2px; border-top: 3px dashed #8eaaf0; transform: rotate(-8deg); }
.connection-line span { position: absolute; left: 50%; top: -8px; width: 14px; height: 14px; border-radius: 50%; background: var(--primary); box-shadow: 0 0 0 8px rgba(46,92,230,.13); }
.app-card { position: absolute; z-index: 5; left: 50%; bottom: 5px; width: 370px; padding: 22px; transform: translateX(-50%); border: 1px solid #d9e1ef; border-radius: 20px; background: rgba(255,255,255,.97); box-shadow: var(--shadow); }
.app-card-head { display: flex; align-items: center; gap: 14px; }
.app-card-head > div { flex: 1; }
.app-card-head strong { display: block; font-size: 20px; line-height: 1.3; }
.app-card-head small { display: block; margin-top: 3px; color: var(--green); font-size: 15px; font-weight: 700; }
.app-card-head small span { display: inline-block; width: 8px; height: 8px; margin-right: 6px; border-radius: 50%; background: var(--green); }
.pc-icon { width: 47px; height: 39px; display: block; border: 3px solid #5478d9; border-radius: 6px; background: #edf2ff; box-shadow: inset 0 -6px 0 #d7e2ff; }
.app-card button { width: 100%; min-height: 51px; margin-top: 18px; border: 0; border-radius: 10px; color: #fff; background: var(--primary); font: 700 17px var(--font); pointer-events: none; }
.app-card button span { float: right; margin-right: 5px; }
.app-card p { margin: 13px 0 0; color: var(--muted); font-size: 14px; text-align: center; }
.app-card p span { color: var(--green); }
.private-pill { position: absolute; z-index: 6; top: 215px; right: 14px; display: flex; align-items: center; gap: 8px; padding: 9px 14px; border: 1px solid #c7dcff; border-radius: 999px; color: #365484; background: #f7faff; box-shadow: 0 8px 20px rgba(46,92,230,.1); font-size: 14px; font-weight: 700; }
.private-pill svg { width: 18px; fill: none; stroke: var(--primary); stroke-width: 2; }

.trust-strip { border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); background: #fff; }
.trust-grid { min-height: 122px; display: grid; grid-template-columns: repeat(3, 1fr); align-items: center; }
.trust-grid p { min-height: 63px; margin: 0; display: grid; grid-template-columns: 42px 1fr; grid-template-rows: auto auto; align-content: center; padding: 0 30px; border-right: 1px solid var(--border); }
.trust-grid p:first-child { padding-left: 0; }
.trust-grid p:last-child { padding-right: 0; border: 0; }
.trust-icon { grid-row: 1 / 3; align-self: center; width: 30px; height: 30px; display: inline-flex; align-items: center; justify-content: center; border-radius: 50%; color: var(--green); background: var(--green-soft); font-weight: 800; }
.trust-grid strong { line-height: 1.35; }
.trust-grid small { color: var(--muted); font-size: 14px; line-height: 1.5; }

.section { padding: 105px 0; background: #fff; }
.section-tint { background: var(--bg); }
.section-heading { max-width: 750px; margin: 0 auto 62px; text-align: center; }
.section-heading.compact { margin-bottom: 52px; }
.section-heading h2, .compatibility-grid h2, .private-grid h2, .final-cta h2 { margin-bottom: 20px; font-size: clamp(34px, 4vw, 48px); }
.section-heading > p:last-child { margin-bottom: 0; color: var(--muted); font-size: 19px; }
.steps { counter-reset: steps; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; list-style: none; }
.steps li { position: relative; min-width: 0; padding: 27px 27px 30px; border: 1px solid var(--border); border-radius: var(--radius); background: #fff; box-shadow: 0 10px 30px rgba(34,54,91,.055); }
.step-number { position: absolute; z-index: 2; top: 19px; left: 19px; width: 38px; height: 38px; display: flex; align-items: center; justify-content: center; border-radius: 50%; color: #fff; background: var(--primary); font-size: 18px; font-weight: 800; box-shadow: 0 6px 14px rgba(46,92,230,.25); }
.step-art { height: 155px; margin: -2px -2px 27px; display: flex; align-items: center; justify-content: center; border-radius: 16px; background: linear-gradient(145deg, #eff3ff, #f8faff); }
.steps h3 { margin-bottom: 13px; font-size: 23px; }
.steps p { margin: 0; color: var(--muted); font-size: 16px; }
.window-art { width: 154px; height: 96px; border: 3px solid #4f70c9; border-radius: 9px; background: #fff; box-shadow: 8px 10px 0 #d9e3ff; text-align: center; }
.window-art i { display: block; height: 20px; background: #dce6ff; border-radius: 5px 5px 0 0; }
.window-art b { display: inline-block; margin-top: 22px; padding: 7px 13px; border-radius: 6px; color: #fff; background: var(--primary); font-size: 12px; }
.two-devices { position: relative; width: 180px; height: 100px; }
.two-devices i { position: absolute; width: 102px; height: 70px; border: 4px solid #4966ac; border-radius: 8px; background: #fff; }
.two-devices i:first-child { left: 0; top: 21px; }
.two-devices i:nth-child(2) { right: 0; top: 0; background: #eaf0ff; }
.two-devices b { position: absolute; z-index: 2; left: 77px; top: 32px; width: 41px; height: 41px; display: flex; align-items: center; justify-content: center; border: 4px solid #fff; border-radius: 50%; color: #fff; background: var(--green); }
.connect-art { width: 185px; padding: 17px 20px; border-radius: 10px; color: #fff; background: var(--primary); box-shadow: 0 12px 22px rgba(46,92,230,.24); font-size: 18px; font-weight: 700; }
.connect-art b { float: right; }
.center-action { margin-top: 43px; text-align: center; }
.button-secondary { border-color: var(--border); color: var(--primary); background: #fff; }
.button-secondary:hover { border-color: #a9baeb; background: #f7f9ff; }

.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.feature-grid article { padding: 31px 29px; border: 1px solid var(--border); border-radius: 18px; background: #fff; }
.feature-icon { width: 46px; height: 46px; display: flex; align-items: center; justify-content: center; margin-bottom: 22px; border-radius: 12px; color: var(--primary); background: var(--primary-soft); font-size: 24px; font-weight: 800; }
.feature-grid h3 { margin-bottom: 9px; font-size: 21px; }
.feature-grid p { margin: 0; color: var(--muted); font-size: 16px; }

.compatibility-grid { display: grid; grid-template-columns: .88fr 1.12fr; gap: 78px; align-items: center; }
.compat-lede { color: var(--muted); font-size: 19px; }
.notice { margin-top: 29px; display: grid; grid-template-columns: 34px 1fr; gap: 14px; padding: 21px; border: 1px solid #f0c7a2; border-radius: 14px; background: #fff8ee; }
.notice svg { width: 29px; fill: none; stroke: #b45b18; stroke-linecap: round; stroke-linejoin: round; stroke-width: 2; }
.notice p { margin: 0; color: #624128; font-size: 16px; }
.notice strong { display: block; margin-bottom: 3px; color: #793e13; }
.check-card { padding: 34px 37px; border: 1px solid var(--border); border-radius: var(--radius); background: var(--bg); }
.check-card h3 { margin-bottom: 24px; font-size: 25px; }
.check-list { margin: 0; padding: 0; list-style: none; }
.check-list li { display: grid; grid-template-columns: 32px 1fr; gap: 12px; padding: 14px 0; border-bottom: 1px solid var(--border); }
.check-list li > span { width: 26px; height: 26px; display: flex; align-items: center; justify-content: center; border-radius: 50%; color: var(--green); background: var(--green-soft); font-weight: 800; }
.check-list strong, .check-list small { display: block; }
.check-list strong { line-height: 1.35; }
.check-list small { margin-top: 3px; color: var(--muted); font-size: 15px; line-height: 1.45; }
.sleep-note { margin: 19px 0 0; color: var(--muted); font-size: 15px; font-style: italic; }

.private-section { color: #fff; background: var(--navy); }
.private-grid { display: grid; grid-template-columns: 340px 1fr; gap: 70px; align-items: center; }
.private-grid h2 { max-width: 700px; }
.private-grid p { max-width: 720px; color: #c7d1e4; }
.eyebrow.light { color: #9eb6ff; }
.shield-art { display: flex; justify-content: center; }
.shield-art svg { width: 230px; max-width: 100%; fill: #29457f; stroke: #7fa1ff; stroke-width: 3; filter: drop-shadow(0 24px 35px rgba(0,0,0,.22)); }
.shield-art .shield-check { fill: none; stroke: #81e4ba; stroke-width: 9; stroke-linecap: round; stroke-linejoin: round; }
.private-list { margin: 26px 0 27px; padding: 0; display: grid; gap: 9px; list-style: none; color: #e9effb; }
.private-list span { margin-right: 11px; color: #81e4ba; font-weight: 800; }
.light-link { color: #a9bdff; }

.faq-shell { max-width: 900px; }
.faq-list { border-top: 1px solid var(--border); }
.faq-list details { border-bottom: 1px solid var(--border); }
.faq-list summary { position: relative; padding: 25px 55px 25px 3px; cursor: pointer; list-style: none; font-size: 20px; font-weight: 700; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary span { position: absolute; right: 5px; top: 50%; width: 29px; height: 29px; transform: translateY(-50%); border-radius: 50%; background: var(--primary-soft); }
.faq-list summary span::before, .faq-list summary span::after { content: ""; position: absolute; left: 8px; top: 14px; width: 13px; height: 2px; background: var(--primary); }
.faq-list summary span::after { transform: rotate(90deg); transition: transform .18s ease; }
.faq-list details[open] summary span::after { transform: rotate(0); }
.faq-list details p { margin: -6px 55px 25px 3px; color: var(--muted); }

.final-cta { padding-top: 20px; }
.final-cta-card { min-height: 250px; display: grid; grid-template-columns: 1fr auto; gap: 50px; align-items: center; padding: 50px 58px; border-radius: 25px; color: #fff; background: linear-gradient(120deg, #294fca, #2e66ea); box-shadow: 0 28px 65px rgba(46,92,230,.24); }
.final-cta h2 { max-width: 680px; margin-bottom: 12px; }
.final-cta p { margin: 0; color: #dbe5ff; }
.button-white { color: var(--primary); background: #fff; box-shadow: 0 10px 25px rgba(18,38,89,.18); }
.button-white:hover { background: #f4f7ff; }

footer { padding: 60px 0 50px; border-top: 1px solid var(--border); background: var(--bg); }
.footer-grid { display: grid; grid-template-columns: 1fr auto; gap: 28px 60px; }
.footer-brand { margin-bottom: 13px; }
.footer-grid > div:first-child > p { max-width: 560px; margin: 0; color: var(--muted); font-size: 15px; }
.footer-links { display: flex; flex-wrap: wrap; align-content: flex-start; justify-content: flex-end; gap: 12px 24px; }
.footer-links a { color: var(--muted); font-size: 15px; font-weight: 650; text-decoration: none; }
.footer-links a:hover { color: var(--primary); }
.legal { grid-column: 1 / -1; margin: 10px 0 0; padding-top: 25px; border-top: 1px solid var(--border); color: var(--muted); font-size: 16px; }

@media (max-width: 980px) {
  .hero-grid { grid-template-columns: 1fr; gap: 55px; }
  .hero-copy { text-align: center; }
  .hero-lede, .reassurance { margin-left: auto; margin-right: auto; }
  .hero-actions { justify-content: center; }
  .hero-visual { width: min(590px, 100%); margin: auto; }
  .trust-grid p { padding-inline: 18px; }
  .steps, .feature-grid { grid-template-columns: 1fr 1fr; }
  .steps li:last-child { grid-column: 1 / -1; max-width: calc(50% - 13px); margin: auto; }
  .compatibility-grid { grid-template-columns: 1fr; gap: 45px; }
  .private-grid { grid-template-columns: 220px 1fr; gap: 45px; }
  .final-cta-card { grid-template-columns: 1fr; }
}

@media (max-width: 720px) {
  body { font-size: 17px; }
  .shell { width: min(100% - 32px, 1160px); }
  .site-header nav { display: none; }
  .header-inner { min-height: 68px; }
  .hero { padding: 62px 0 72px; }
  .hero-grid { gap: 38px; }
  h1 { font-size: 42px; }
  .hero-lede { font-size: 18px; }
  .hero-actions { flex-direction: column; align-items: stretch; }
  .hero-actions .text-link { text-align: center; }
  .button { width: 100%; }
  .download-meta { text-align: center; }
  .hero-visual { min-height: 435px; transform: scale(.92); transform-origin: top center; margin-bottom: -35px; }
  .device-laptop .device-screen { width: 150px; height: 105px; }
  .device-desktop .device-screen { width: 175px; height: 125px; }
  .laptop-base { width: 174px; }
  .connection-line { left: 130px; right: 130px; top: 175px; }
  .app-card { width: min(350px, 94vw); }
  .private-pill { top: 190px; right: 0; }
  .trust-grid { grid-template-columns: 1fr; padding-block: 10px; }
  .trust-grid p, .trust-grid p:first-child, .trust-grid p:last-child { min-height: 90px; padding: 14px 4px; border-right: 0; border-bottom: 1px solid var(--border); }
  .trust-grid p:last-child { border-bottom: 0; }
  .section { padding: 78px 0; }
  .section-heading { margin-bottom: 42px; }
  .section-heading h2, .compatibility-grid h2, .private-grid h2, .final-cta h2 { font-size: 35px; }
  .steps, .feature-grid { grid-template-columns: 1fr; }
  .steps li:last-child { grid-column: auto; max-width: none; }
  .private-grid { grid-template-columns: 1fr; text-align: center; }
  .shield-art svg { width: 155px; }
  .private-list { text-align: left; display: inline-grid; }
  .final-cta-card { width: calc(100% - 32px); padding: 38px 25px; text-align: center; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-links { justify-content: flex-start; }
}

@media (max-width: 430px) {
  h1 { font-size: 37px; }
  .hero-grid, .hero-copy { min-width: 0; }
  .hero-visual { left: auto; width: 100%; max-width: 100%; transform: none; margin-bottom: 0; }
  .private-pill { right: 15px; }
  .section-heading h2, .compatibility-grid h2, .private-grid h2, .final-cta h2 { font-size: 31px; }
  .check-card { padding: 28px 22px; }
  .faq-list summary { font-size: 18px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; animation: none !important; }
}