:root {
  --bg: #07101f;
  --panel: #0d192d;
  --panel-2: #101f37;
  --text: #f5f8ff;
  --muted: #9baccc;
  --line: rgba(255,255,255,.1);
  --blue: #4d82ff;
  --blue-2: #79a2ff;
  --cyan: #3ad6e9;
  --max: 1160px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at 76% 12%, rgba(61,111,241,.17), transparent 27rem),
    linear-gradient(180deg, #07101f 0, #091426 48%, #07101f 100%);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
.shell { width: min(calc(100% - 40px), var(--max)); margin: 0 auto; }

.nav {
  height: 76px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
}
.brand { display: inline-flex; align-items: center; gap: 11px; font-size: 20px; font-weight: 750; letter-spacing: -.02em; }
.brand-mark {
  width: 38px; height: 38px; display: grid; place-items: center;
  border-radius: 11px; background: linear-gradient(145deg, #2d65ef, #6d95ff);
  box-shadow: 0 8px 28px rgba(54,105,240,.28);
}
.brand-mark svg { width: 28px; fill: none; stroke: white; stroke-width: 2.4; stroke-linecap: round; stroke-linejoin: round; }
.brand-mark .signal { stroke: #bcd0ff; stroke-width: 2; }
.brand-mark .dot { fill: #bcd0ff; stroke: none; }
.nav nav { display: flex; align-items: center; gap: 30px; font-size: 14px; color: var(--muted); }
.nav nav a:hover { color: white; }
.nav-download { color: white !important; padding: 10px 17px; background: rgba(77,130,255,.16); border: 1px solid rgba(110,153,255,.32); border-radius: 10px; }
.language-select {
  max-width: 120px;
  padding: 9px 28px 9px 11px;
  color: #c9d6ed;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: #0d192d;
  font: inherit;
  font-size: 12px;
  cursor: pointer;
}

.hero { min-height: 660px; display: grid; grid-template-columns: 1.02fr .98fr; align-items: center; gap: 50px; padding-top: 55px; padding-bottom: 70px; }
.eyebrow { display: flex; align-items: center; gap: 9px; color: #a9bce4; font-size: 13px; font-weight: 650; letter-spacing: .09em; text-transform: uppercase; }
.eyebrow span { width: 8px; height: 8px; border-radius: 50%; background: var(--cyan); box-shadow: 0 0 14px var(--cyan); }
h1 { margin: 20px 0 22px; font-size: clamp(48px, 6.3vw, 78px); line-height: 1.03; letter-spacing: -.055em; }
h1 em { font-style: normal; color: transparent; background: linear-gradient(90deg, #77a0ff, #54dae7); -webkit-background-clip: text; background-clip: text; }
.hero-lead { max-width: 610px; margin: 0; color: #b6c4df; font-size: 18px; line-height: 1.8; }
.hero-actions { display: flex; gap: 13px; margin-top: 32px; }
.button { min-height: 50px; padding: 0 22px; border-radius: 12px; display: inline-flex; align-items: center; justify-content: center; gap: 9px; font-weight: 700; font-size: 15px; transition: transform .2s, border-color .2s, background .2s; }
.button:hover { transform: translateY(-2px); }
.button.primary { background: linear-gradient(135deg, #346cf2, #5d8eff); box-shadow: 0 12px 30px rgba(44,101,240,.3); }
.button.primary svg { width: 20px; fill: none; stroke: white; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.button.ghost { border: 1px solid var(--line); background: rgba(255,255,255,.035); color: #cdd8ee; }
.button.large { min-height: 56px; padding-inline: 28px; }
.release-meta { display: flex; align-items: center; gap: 10px; margin-top: 21px; color: #7486a6; font-size: 12px; }
.release-meta i { width: 3px; height: 3px; background: #53637f; border-radius: 50%; }

.hero-visual { height: 500px; position: relative; }
.ambient { position: absolute; border-radius: 50%; filter: blur(2px); }
.ambient.one { width: 330px; height: 330px; right: 20px; top: 20px; background: rgba(48,103,238,.16); }
.ambient.two { width: 190px; height: 190px; left: 60px; bottom: 30px; background: rgba(45,212,225,.11); }
.projector-screen {
  position: absolute; width: 355px; height: 225px; right: 0; top: 65px;
  overflow: hidden; border: 1px solid rgba(160,185,255,.24); border-radius: 18px;
  background: linear-gradient(145deg, #172a48, #0b172b);
  box-shadow: 0 32px 70px rgba(0,0,0,.35), inset 0 1px rgba(255,255,255,.05);
}
.screen-bar { height: 29px; display: flex; align-items: center; gap: 5px; padding-left: 12px; border-bottom: 1px solid var(--line); }
.screen-bar span { width: 5px; height: 5px; border-radius: 50%; background: #445572; }
.screen-content { height: calc(100% - 29px); display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 8px; }
.screen-logo { width: 48px; height: 48px; border-radius: 14px; display: grid; place-items: center; background: linear-gradient(145deg, #3973f4, #61d9e5); font-weight: 900; font-size: 22px; }
.screen-content strong { font-size: 17px; }
.screen-content small { color: var(--muted); }
.phone { position: absolute; width: 190px; height: 390px; left: 15px; bottom: 5px; padding: 9px; border-radius: 34px; background: linear-gradient(145deg, #28334a, #070b12 42%); box-shadow: 0 35px 65px rgba(0,0,0,.5); border: 1px solid rgba(255,255,255,.14); transform: rotate(-3deg); }
.phone-speaker { width: 56px; height: 5px; border-radius: 5px; background: #39445b; margin: 4px auto 8px; }
.phone-screen { height: 353px; border-radius: 24px; padding: 22px 14px 16px; background: linear-gradient(180deg, #14233d, #0b1425); overflow: hidden; }
.phone-title { font-size: 17px; font-weight: 800; }
.receiver-card { margin-top: 38px; padding: 15px; border: 1px solid rgba(105,151,255,.25); border-radius: 14px; background: rgba(67,110,220,.12); display: flex; flex-direction: column; gap: 5px; }
.receiver-card small { color: #8496b8; }
.receiver-card strong { font-size: 16px; }
.receiver-card span { color: #62d9b3; font-size: 11px; }
.cast-button { margin-top: 18px; height: 42px; border-radius: 11px; display: grid; place-items: center; background: linear-gradient(135deg, #3972f4, #5b8dfd); font-size: 13px; font-weight: 750; }
.phone-controls { display: flex; justify-content: space-around; margin-top: 58px; }
.phone-controls span { width: 26px; height: 4px; border-radius: 5px; background: #33435f; }
.link-beam { position: absolute; left: 188px; top: 255px; width: 96px; display: flex; gap: 10px; transform: rotate(-8deg); z-index: 3; }
.link-beam span { width: 10px; height: 10px; border-radius: 50%; background: #67d8e6; opacity: .32; animation: pulse 1.6s infinite; }
.link-beam span:nth-child(2) { animation-delay: .25s; }.link-beam span:nth-child(3) { animation-delay: .5s; }
@keyframes pulse { 50% { opacity: 1; box-shadow: 0 0 18px #67d8e6; transform: scale(1.18); } }

.trust-strip { border-block: 1px solid var(--line); background: rgba(9,20,38,.72); }
.trust-grid { display: grid; grid-template-columns: repeat(4, 1fr); }
.trust-grid div { padding: 24px 25px; border-right: 1px solid var(--line); display: flex; flex-direction: column; gap: 5px; }
.trust-grid div:last-child { border-right: 0; }
.trust-grid strong { font-size: 15px; }.trust-grid span { color: #7f91b1; font-size: 12px; }

.section { padding-top: 110px; padding-bottom: 110px; }
.section-heading { max-width: 640px; margin-bottom: 48px; }
.section-heading > span, .pill { display: inline-flex; color: #78a0ff; font-size: 12px; font-weight: 750; letter-spacing: .12em; text-transform: uppercase; }
.section-heading h2, .download-copy h2, .requirements h2 { margin: 12px 0 12px; font-size: clamp(34px, 4vw, 48px); letter-spacing: -.04em; }
.section-heading p, .download-copy p { color: var(--muted); line-height: 1.75; }

.showcase { padding-bottom: 45px; }
.showcase-grid { display: grid; grid-template-columns: minmax(0, 1.55fr) minmax(290px, .65fr); gap: 22px; align-items: stretch; }
.scene-card, .app-preview { margin: 0; overflow: hidden; border: 1px solid var(--line); border-radius: 24px; background: #0d192d; }
.scene-card { position: relative; min-height: 570px; }
.scene-card::after { content: ""; position: absolute; inset: 45% 0 0; background: linear-gradient(transparent, rgba(4,10,20,.92)); pointer-events: none; }
.scene-card img { width: 100%; height: 100%; object-fit: cover; display: block; }
.scene-card figcaption { position: absolute; z-index: 2; left: 30px; right: 30px; bottom: 28px; display: flex; flex-direction: column; gap: 8px; }
.scene-card figcaption span, .app-preview-copy > span { color: #78a0ff; font-size: 11px; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; }
.scene-card figcaption strong { max-width: 520px; font-size: 25px; line-height: 1.3; }
.app-preview { min-height: 570px; padding: 27px 27px 0; display: flex; flex-direction: column; }
.app-preview-copy h3 { margin: 9px 0 8px; font-size: 23px; }
.app-preview-copy p { margin: 0; color: #91a3c3; font-size: 13px; line-height: 1.65; }
.screenshot-shell { width: min(84%, 300px); height: 410px; margin: 26px auto 0; padding: 8px 8px 0; overflow: hidden; border-radius: 26px 26px 0 0; background: #050a12; box-shadow: 0 22px 45px rgba(0,0,0,.42); }
.screenshot-shell img { width: 100%; height: auto; display: block; border-radius: 20px 20px 0 0; }

.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.feature-grid article { min-height: 220px; padding: 26px; border: 1px solid var(--line); border-radius: 18px; background: linear-gradient(145deg, rgba(19,37,64,.86), rgba(10,22,40,.75)); }
.feature-icon { width: 43px; height: 43px; display: grid; place-items: center; border-radius: 12px; font-weight: 900; font-size: 20px; }
.feature-icon.blue { color:#8eaeff; background:#18377a }.feature-icon.violet { color:#c4a2ff; background:#3a266b }
.feature-icon.cyan { color:#6fe6ef; background:#153f58 }.feature-icon.orange { color:#ffd28a; background:#58361b }
.feature-icon.pink { color:#f5a4db; background:#57284b }.feature-icon.green { color:#75e2b9; background:#16483e }
.feature-grid h3 { margin: 20px 0 9px; font-size: 18px; }
.feature-grid p { margin: 0; color: #93a5c5; line-height: 1.7; font-size: 14px; }

.steps-section { background: rgba(10,21,39,.72); border-block: 1px solid var(--line); }
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.steps article { position: relative; padding: 30px; border-left: 1px solid #36568e; background: linear-gradient(90deg, rgba(48,88,162,.1), transparent); }
.steps b { color: #5f8eff; font-size: 13px; letter-spacing: .1em; }
.steps h3 { margin: 28px 0 10px; font-size: 20px; }
.steps p { margin: 0; color: #91a3c3; line-height: 1.75; font-size: 14px; }

.download-section { min-height: 530px; padding-top: 105px; padding-bottom: 105px; display: grid; grid-template-columns: 1fr 360px; align-items: center; gap: 80px; }
.download-copy p { max-width: 570px; }
.download-copy small { display: block; margin-top: 16px; max-width: 540px; color: #7082a2; line-height: 1.6; }
.pill { padding: 8px 12px; border: 1px solid rgba(99,145,255,.25); border-radius: 999px; background: rgba(66,112,232,.1); }
.qr-card { padding: 25px; border: 1px solid var(--line); border-radius: 22px; text-align: center; background: linear-gradient(145deg, #12223b, #0b172a); box-shadow: 0 25px 55px rgba(0,0,0,.25); }
.qr-frame { background: white; padding: 14px; border-radius: 15px; margin-bottom: 18px; }
.qr-frame img { width: 100%; height: auto; display: block; }
.qr-card strong { display: block; font-size: 17px; }.qr-card span { display: block; margin-top: 6px; color: #788cab; font-size: 11px; word-break: break-all; }

.requirements { padding: 45px 38px; margin-bottom: 100px; border: 1px solid var(--line); border-radius: 20px; background: rgba(16,31,55,.72); display: grid; grid-template-columns: 280px 1fr; align-items: center; }
.requirements h2 { font-size: 31px; margin: 0; }
.requirements > div { display: grid; grid-template-columns: 1fr 1fr; gap: 18px 30px; }
.requirements p { margin: 0; color: #8da0c1; font-size: 13px; }.requirements strong { color: #dbe5f7; margin-right: 10px; }

footer { border-top: 1px solid var(--line); background: #050c17; }
.footer-inner { min-height: 120px; display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 15px; }
.footer-inner > div:nth-child(2) { display: flex; gap: 24px; color: #8999b6; font-size: 13px; }
.footer-inner p { grid-column: 1 / -1; margin: -22px 0 25px; color: #52627e; font-size: 11px; }
.brand-mark.mini { font-size: 15px; width: 31px; height: 31px; border-radius: 9px; }

.policy { max-width: 820px; padding-top: 65px; padding-bottom: 100px; }
.policy h1 { font-size: 46px; }
.policy .effective { color: #7889a7; margin-bottom: 48px; }
.policy section { margin-top: 36px; }
.policy h2 { font-size: 21px; }
.policy p, .policy li { color: #a9b7d0; line-height: 1.8; }
.policy a { color: #7fa5ff; }
.back { display: inline-block; margin-bottom: 35px; color: #8fa8d8; }
.policy-toolbar { display: flex; align-items: center; justify-content: space-between; gap: 20px; margin-bottom: 35px; }
.policy-toolbar .back { margin-bottom: 0; }

@media (max-width: 900px) {
  .nav nav { gap: 10px; }
  .nav nav a:not(.nav-download) { display: none; }
  .hero { grid-template-columns: 1fr; padding-top: 70px; }
  .hero-copy { text-align: center; }.eyebrow,.hero-actions,.release-meta { justify-content: center; }.hero-lead { margin-inline: auto; }
  .hero-visual { max-width: 560px; width: 100%; margin: 0 auto; }
  .trust-grid { grid-template-columns: 1fr 1fr; }.trust-grid div:nth-child(2) { border-right: 0; }
  .showcase-grid { grid-template-columns: 1fr; }
  .scene-card { min-height: 480px; }
  .app-preview { min-height: 520px; }
  .feature-grid { grid-template-columns: 1fr 1fr; }
  .download-section { grid-template-columns: 1fr; }.qr-card { max-width: 360px; }
  .requirements { grid-template-columns: 1fr; gap: 25px; }
}

@media (max-width: 580px) {
  .shell { width: min(calc(100% - 28px), var(--max)); }
  .nav { height: 66px; }.nav-download { padding: 8px 10px; font-size: 12px; }
  .language-select { max-width: 95px; padding: 8px 22px 8px 8px; }
  h1 { font-size: 43px; }.hero-lead { font-size: 16px; }
  .hero-actions { flex-direction: column; }.button { width: 100%; }
  .hero-visual { height: 405px; transform: scale(.88); transform-origin: center top; margin-bottom: -30px; }
  .projector-screen { width: 310px; height: 195px; }
  .phone { width: 165px; height: 340px; }.phone-screen { height: 304px; }.phone-controls { margin-top: 35px; }
  .trust-grid, .feature-grid, .steps { grid-template-columns: 1fr; }
  .trust-grid div { border-right: 0; border-bottom: 1px solid var(--line); }
  .scene-card { min-height: 390px; }
  .scene-card figcaption { left: 22px; right: 22px; bottom: 22px; }
  .scene-card figcaption strong { font-size: 21px; }
  .section { padding-block: 80px; }
  .requirements > div { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; padding-block: 30px; }.footer-inner p { margin: 0; }
  .policy-toolbar { align-items: flex-start; }
}

/* 多语言 App mockup(替代写死的中文截图 app-screen.webp) */
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0; }
.app-mock { height: 100%; overflow: hidden; padding: 14px 14px 0; text-align: left; background: #f4f6fa; color: #1a2230; border-radius: 20px 20px 0 0; font-size: 12px; }
.am-status { display: flex; justify-content: space-between; font-size: 11px; font-weight: 700; color: #8a93a3; }
.am-brand { margin: 8px 0 4px; font-size: 20px; font-weight: 800; color: #141b28; }
.am-sub { margin: 0 0 14px; font-size: 11px; line-height: 1.5; color: #5b6577; }
.am-label { margin: 0 0 6px; font-size: 11px; font-weight: 700; color: #8a93a3; }
.am-card { margin: 0 0 12px; padding: 12px 13px; background: #fff; border: 1px solid #e6eaf1; border-radius: 14px; box-shadow: 0 4px 12px rgba(20,30,60,.04); }
.am-row { display: flex; align-items: center; justify-content: space-between; }
.am-card b { font-size: 14px; font-weight: 700; color: #141b28; }
.am-card small { display: block; margin-top: 3px; font-size: 11px; color: #8a93a3; }
.am-card em { font-style: normal; font-size: 10px; font-weight: 700; color: #4a72e8; background: #eaf0ff; border-radius: 8px; padding: 3px 8px; }
.am-div { height: 1px; margin: 10px 0; background: #eef1f6; }
.am-btns { display: flex; gap: 10px; margin: 0 0 14px; }
.am-btn { flex: 1; padding: 11px 0; text-align: center; font-size: 12px; font-weight: 600; color: #2a3346; background: #fff; border: 1px solid #e2e6ee; border-radius: 12px; }
.am-dot b { position: relative; padding-left: 14px; }
.am-dot b::before { content: ""; position: absolute; left: 0; top: 50%; transform: translateY(-50%); width: 7px; height: 7px; border-radius: 50%; background: #e5484d; }
.am-primary { margin: 0 0 14px; padding: 13px 0; text-align: center; font-size: 13px; font-weight: 700; color: #fff; background: #3a63e6; border-radius: 12px; }
.am-rot span { color: #5b6577; font-weight: 600; }
.am-sound .am-switch { flex: none; position: relative; width: 34px; height: 20px; border-radius: 20px; background: #37c186; }
.am-sound .am-switch::after { content: ""; position: absolute; right: 2px; top: 2px; width: 16px; height: 16px; border-radius: 50%; background: #fff; }