:root {
  --ink: #07111f;
  --text: #172033;
  --muted: #697386;
  --line: #e6eaf0;
  --blue: #2563eb;
  --blue-light: #eaf1ff;
  --surface: #f5f7fb;
  --white: #fff;
  --radius: 24px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  overflow-x: hidden;
  color: var(--text);
  background: #fff;
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
svg { width: 1em; height: 1em; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.shell { width: min(1160px, calc(100% - 48px)); margin-inline: auto; }
.ambient { position: absolute; border-radius: 50%; filter: blur(90px); pointer-events: none; opacity: .34; }
.ambient-one { width: 500px; height: 500px; background: #c5d8ff; top: -270px; right: 4%; }
.ambient-two { width: 320px; height: 320px; background: #d9ccff; top: 470px; left: -220px; opacity: .22; }

.site-header {
  width: min(1220px, calc(100% - 40px)); height: 82px; margin: 0 auto; display: flex; align-items: center; gap: 48px;
  position: relative; z-index: 10;
}
.brand { display: inline-flex; align-items: center; gap: 11px; color: var(--ink); font-weight: 760; letter-spacing: -.02em; font-size: 19px; }
.brand-mark { width: 38px; height: 38px; border-radius: 12px; display: grid; place-items: center; color: white; background: linear-gradient(145deg, #3478ff, #1747cc); box-shadow: 0 9px 24px rgba(37, 99, 235, .25); }
.brand-mark svg { font-size: 22px; }
.site-header nav { display: flex; gap: 34px; margin-left: auto; }
.site-header nav a { color: #4f5b6d; font-size: 14px; font-weight: 600; transition: color .2s; }
.site-header nav a:hover { color: var(--blue); }
.header-download { color: #fff; background: var(--ink); padding: 11px 18px; border-radius: 12px; font-size: 14px; font-weight: 700; transition: transform .2s, box-shadow .2s; }
.header-download:hover { transform: translateY(-2px); box-shadow: 0 9px 22px rgba(7,17,31,.18); }

.hero { min-height: 690px; display: grid; grid-template-columns: 1.08fr .92fr; align-items: center; gap: 48px; padding-block: 70px 92px; position: relative; }
.eyebrow { display: flex; align-items: center; gap: 9px; color: #536078; font-size: 13px; font-weight: 700; letter-spacing: .03em; margin-bottom: 23px; }
.eyebrow span { width: 25px; height: 7px; border-radius: 8px; background: var(--blue); box-shadow: 0 0 0 6px var(--blue-light); margin-right: 4px; }
h1 { margin: 0; color: var(--ink); font-size: clamp(52px, 6.2vw, 82px); line-height: .98; letter-spacing: -.065em; font-weight: 800; }
h1 em { color: var(--blue); font-style: normal; }
.hero-lead { max-width: 580px; margin: 28px 0 32px; color: var(--muted); font-size: 18px; line-height: 1.8; }
.hero-actions { display: flex; align-items: center; gap: 28px; }
.primary-button { display: flex; align-items: center; gap: 13px; min-width: 225px; padding: 14px 20px; color: #fff; background: linear-gradient(135deg, #3478ff, #1d4ed8); border-radius: 16px; box-shadow: 0 14px 34px rgba(37,99,235,.25); transition: transform .2s, box-shadow .2s; }
.primary-button:hover { transform: translateY(-3px); box-shadow: 0 18px 40px rgba(37,99,235,.33); }
.primary-button svg { font-size: 27px; }
.primary-button span { font-weight: 750; line-height: 1.25; }
.primary-button small { display: block; font-size: 10px; opacity: .68; font-weight: 600; margin-bottom: 2px; }
.text-button { color: var(--text); font-weight: 700; font-size: 14px; }
.text-button span { color: var(--blue); font-size: 19px; margin-left: 6px; transition: margin .2s; }
.text-button:hover span { margin-left: 10px; }
.build-meta { display: flex; align-items: center; gap: 17px; margin-top: 31px; color: #8490a2; font-size: 11px; }
.build-meta span { display: flex; flex-direction: column; gap: 3px; }
.build-meta strong { color: #475367; font-size: 12px; }
.build-meta i { width: 1px; height: 26px; background: var(--line); }

.device-stage { position: relative; min-height: 535px; display: grid; place-items: center; }
.device-stage:before { content: ""; position: absolute; width: 410px; height: 410px; border-radius: 50%; background: radial-gradient(circle at 40% 35%, #dce8ff, #eef3ff 55%, transparent 72%); }
.orbit { position: absolute; border: 1px solid #d6dfef; border-radius: 50%; transform: rotate(-17deg); }
.orbit-one { width: 455px; height: 245px; }
.orbit-two { width: 520px; height: 330px; opacity: .6; }
.phone { position: relative; z-index: 2; width: 275px; height: 536px; border: 8px solid #0b1321; border-radius: 41px; background: #fff; overflow: hidden; box-shadow: 0 37px 90px rgba(20,39,73,.24), inset 0 0 0 1px rgba(255,255,255,.3); transform: rotate(2.8deg); }
.phone-speaker { position: absolute; z-index: 4; left: 50%; top: 7px; width: 80px; height: 22px; transform: translateX(-50%); background: #0b1321; border-radius: 0 0 13px 13px; }
.browser-bar { height: 69px; padding: 26px 10px 9px; display: flex; gap: 6px; align-items: center; background: #f5f7fa; border-bottom: 1px solid #e5e9f0; font-size: 15px; }
.mini-arrow, .refresh { color: #4b586c; font-weight: 700; }.faded { opacity: .3; }
.address { flex: 1; height: 27px; border-radius: 8px; background: white; border: 1px solid #e1e6ee; padding: 6px 8px; color: #8490a2; font-size: 8px; overflow: hidden; }
.screen-content { padding: 13px; }
.video-preview { position: relative; height: 190px; border-radius: 15px; overflow: hidden; background: linear-gradient(140deg, #111c2d, #2f4b72); }
.video-preview:before { content: ""; position: absolute; inset: 0; background: radial-gradient(circle at 68% 30%, rgba(109,149,211,.58), transparent 38%), linear-gradient(20deg, rgba(5,14,28,.6), transparent); }
.play { position: absolute; left: 50%; top: 50%; width: 45px; height: 45px; transform: translate(-50%,-50%); border-radius: 50%; background: rgba(255,255,255,.92); display: grid; place-items: center; box-shadow: 0 8px 25px rgba(0,0,0,.18); }
.play i { width: 0; height: 0; border-top: 7px solid transparent; border-bottom: 7px solid transparent; border-left: 11px solid var(--blue); margin-left: 3px; }
.video-time { position: absolute; right: 8px; bottom: 8px; color: white; background: rgba(0,0,0,.55); padding: 3px 6px; border-radius: 5px; font-size: 8px; }
.content-line { width: 63%; height: 8px; margin-top: 11px; border-radius: 8px; background: #e9edf3; }.content-line.wide { width: 92%; margin-top: 16px; }
.source-card { display: flex; align-items: center; gap: 9px; margin-top: 18px; padding: 10px; border-radius: 12px; background: #f0f5ff; border: 1px solid #dce8ff; }
.file-icon { display: grid; place-items: center; width: 34px; height: 34px; color: #fff; background: var(--blue); border-radius: 9px; font-size: 8px; font-weight: 800; }
.source-card > span:nth-child(2) { display: flex; flex-direction: column; flex: 1; }.source-card strong { color: #20304a; font-size: 9px; }.source-card small { color: #7b8799; font-size: 7px; margin-top: 3px; }.source-card b { color: var(--blue); }
.floating-download { position: absolute; right: 15px; bottom: 53px; width: 50px; height: 50px; display: grid; place-items: center; color: white; background: linear-gradient(145deg,#3e7dff,#1d4ed8); border-radius: 50%; font-size: 25px; box-shadow: 0 10px 22px rgba(37,99,235,.38); }
.gesture-line { position: absolute; bottom: 8px; left: 50%; width: 88px; height: 4px; transform: translateX(-50%); background: #0b1321; border-radius: 5px; }
.privacy-pill { position: absolute; z-index: 3; right: -8px; bottom: 68px; padding: 10px 14px; color: #344159; background: rgba(255,255,255,.92); border: 1px solid #e3e9f2; box-shadow: 0 14px 35px rgba(28,48,80,.14); backdrop-filter: blur(12px); border-radius: 12px; font-size: 11px; font-weight: 650; }
.privacy-pill span { display: inline-grid; place-items: center; width: 18px; height: 18px; margin-right: 5px; color: #fff; background: #19a974; border-radius: 50%; font-size: 10px; }

.trust-strip { display: flex; align-items: center; justify-content: center; gap: 34px; min-height: 74px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); color: #687489; font-size: 12px; font-weight: 700; letter-spacing: .04em; }
.trust-strip i { width: 4px; height: 4px; background: #b9c2d0; border-radius: 50%; }
.features, .faq { padding-block: 118px; }
.section-heading { max-width: 650px; margin: 0 auto 48px; text-align: center; }
.section-heading > span { color: var(--blue); font-size: 12px; font-weight: 800; letter-spacing: .09em; text-transform: uppercase; }
.section-heading h2 { margin: 13px 0 14px; color: var(--ink); font-size: clamp(34px, 4vw, 50px); line-height: 1.12; letter-spacing: -.045em; }
.section-heading p { margin: 0; color: var(--muted); line-height: 1.8; }
.section-heading.left { margin: 0; text-align: left; }
.feature-grid { display: grid; grid-template-columns: 1.15fr .925fr .925fr; gap: 18px; }
.feature-card { min-height: 330px; padding: 34px; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); box-shadow: 0 12px 35px rgba(27,43,72,.045); transition: transform .25s, box-shadow .25s; }
.feature-card:hover { transform: translateY(-5px); box-shadow: 0 20px 45px rgba(27,43,72,.09); }
.feature-card.featured { background: linear-gradient(145deg,#f8fbff,#eef4ff); border-color: #dce7fa; }
.feature-icon { width: 49px; height: 49px; display: grid; place-items: center; border-radius: 15px; font-size: 25px; }.feature-icon.blue { color: #2563eb; background: #dfeaff; }.feature-icon.violet { color: #7c3aed; background: #eee6ff; }.feature-icon.green { color: #13885d; background: #dcf7ec; }
.feature-card h3 { margin: 26px 0 11px; color: var(--ink); font-size: 20px; letter-spacing: -.02em; }.feature-card p { margin: 0; color: var(--muted); font-size: 14px; line-height: 1.85; }
.source-tags { display: flex; flex-wrap: wrap; gap: 7px; margin-top: 25px; }.source-tags span { padding: 7px 10px; color: #536785; background: rgba(255,255,255,.75); border: 1px solid #d9e3f2; border-radius: 8px; font-size: 9px; font-weight: 800; }

.guide-wrap { padding-block: 105px; color: #fff; background: var(--ink); position: relative; overflow: hidden; }
.guide-wrap:before { content: ""; position: absolute; width: 500px; height: 500px; border-radius: 50%; right: -180px; top: -220px; background: radial-gradient(circle, rgba(52,120,255,.3), transparent 68%); }
.guide { display: grid; grid-template-columns: .8fr 1.2fr; gap: 90px; align-items: start; position: relative; }
.guide .section-heading h2 { color: #fff; }.guide .section-heading > span { color: #7da5ff; }
.steps { list-style: none; padding: 0; margin: 0; border-top: 1px solid rgba(255,255,255,.12); }
.steps li { display: grid; grid-template-columns: 58px 1fr; gap: 12px; padding: 27px 0; border-bottom: 1px solid rgba(255,255,255,.12); }
.steps b { color: #6f9bff; font-size: 11px; letter-spacing: .06em; }.steps h3 { margin: 0 0 7px; font-size: 17px; }.steps p { margin: 0; color: #96a3b7; line-height: 1.65; font-size: 13px; }
.secondary-download { grid-column: 2; justify-self: start; margin-top: -52px; padding: 13px 18px; border: 1px solid rgba(255,255,255,.25); border-radius: 12px; font-size: 13px; font-weight: 700; }.secondary-download span { margin-left: 8px; color: #7da5ff; }

.faq-list { max-width: 820px; margin: auto; border-top: 1px solid var(--line); }
details { border-bottom: 1px solid var(--line); } summary { list-style: none; cursor: pointer; display: flex; justify-content: space-between; align-items: center; padding: 24px 2px; color: var(--ink); font-weight: 720; } summary::-webkit-details-marker { display: none; } summary span { color: var(--blue); font-size: 24px; font-weight: 400; transition: transform .2s; } details[open] summary span { transform: rotate(45deg); } details p { margin: -8px 0 25px; max-width: 700px; color: var(--muted); font-size: 14px; line-height: 1.8; }
.final-cta { min-height: 330px; padding: 62px 70px; display: flex; align-items: center; justify-content: space-between; color: white; background: linear-gradient(125deg,#1646c6,#2f75ff); border-radius: 31px; overflow: hidden; position: relative; box-shadow: 0 25px 60px rgba(37,99,235,.2); }
.final-cta:after { content: ""; position: absolute; width: 370px; height: 370px; right: -90px; top: -160px; border: 1px solid rgba(255,255,255,.2); border-radius: 50%; box-shadow: 0 0 0 45px rgba(255,255,255,.035), 0 0 0 90px rgba(255,255,255,.025); }
.brand-mark.large { width: 47px; height: 47px; background: rgba(255,255,255,.17); box-shadow: none; }
.final-cta h2 { margin: 20px 0 10px; font-size: 43px; line-height: 1.08; letter-spacing: -.045em; }.final-cta p { margin: 0; color: rgba(255,255,255,.72); }
.light-button { position: relative; z-index: 2; padding: 16px 21px; color: #1746c6; background: #fff; border-radius: 14px; font-weight: 800; font-size: 14px; box-shadow: 0 14px 30px rgba(7,17,31,.15); }.light-button span { margin-left: 12px; }
footer { min-height: 150px; display: flex; align-items: center; gap: 30px; color: #8791a2; font-size: 11px; } footer p { margin: auto; } footer .muted { color: #5b6678; font-size: 15px; }.brand-mark.small { width: 29px; height: 29px; border-radius: 9px; font-size: 15px; }
.download-toast { position: fixed; z-index: 30; left: 50%; bottom: 24px; transform: translate(-50%, 100px); opacity: 0; padding: 12px 18px; color: white; background: rgba(7,17,31,.92); backdrop-filter: blur(10px); border-radius: 12px; font-size: 13px; box-shadow: 0 14px 35px rgba(7,17,31,.25); transition: transform .35s, opacity .35s; }.download-toast.show { transform: translate(-50%,0); opacity: 1; }

@media (max-width: 900px) {
  .site-header nav { display: none; }
  .site-header { gap: 18px; }.header-download { margin-left: auto; }
  .hero { grid-template-columns: 1fr; text-align: center; padding-top: 55px; }
  .hero-lead { margin-inline: auto; }.hero-actions, .build-meta { justify-content: center; }.device-stage { margin-top: 20px; }
  .feature-grid { grid-template-columns: 1fr; }.feature-card { min-height: auto; }
  .guide { grid-template-columns: 1fr; gap: 45px; }.secondary-download { grid-column: 1; margin-top: 0; }
}

@media (max-width: 600px) {
  .shell { width: min(100% - 30px, 1160px); }
  .site-header { width: calc(100% - 28px); height: 70px; }.brand { font-size: 16px; }.brand-mark { width: 34px; height: 34px; }.header-download { padding: 10px 13px; font-size: 12px; }
  .hero { padding: 48px 0 70px; gap: 25px; } h1 { font-size: 50px; }.hero-lead { font-size: 16px; line-height: 1.7; }.hero-actions { flex-direction: column; gap: 18px; }.primary-button { min-width: 235px; }.build-meta { gap: 10px; flex-wrap: wrap; }.build-meta i { display: none; }.build-meta span { padding: 0 6px; }
  .device-stage { min-height: 500px; transform: scale(.9); margin: -10px 0 -35px; }.orbit-two { width: 430px; }
  .privacy-pill { right: 6px; }.trust-strip { gap: 13px; flex-wrap: wrap; padding: 18px; }.trust-strip i { display: none; }.trust-strip span { width: 46%; text-align: center; }
  .features, .faq { padding-block: 85px; }.section-heading { margin-bottom: 35px; }.section-heading h2 { font-size: 35px; }.feature-card { padding: 28px; }
  .guide-wrap { padding-block: 80px; }.steps li { grid-template-columns: 45px 1fr; }
  .final-cta { min-height: 420px; padding: 45px 28px; flex-direction: column; align-items: flex-start; justify-content: center; gap: 35px; }.final-cta h2 { font-size: 38px; }.light-button { width: 100%; text-align: center; }
  footer { padding-block: 38px; min-height: 0; flex-direction: column; gap: 14px; text-align: center; } footer p { margin: 0; }
}

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