:root {
  --ink: #071425;
  --muted: #5d6b7d;
  --line: rgba(7, 20, 37, .11);
  --blue: #006ee6;
  --cyan: #00b8d9;
  --white: #fff;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  font-family: Inter, "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  background: #f7fafc;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
button, a { -webkit-tap-highlight-color: transparent; }
.page-glow { position: fixed; border-radius: 50%; filter: blur(2px); pointer-events: none; z-index: -1; }
.glow-one { width: 520px; height: 520px; right: -220px; top: -190px; background: radial-gradient(circle, rgba(0,184,217,.17), transparent 68%); }
.glow-two { width: 520px; height: 520px; left: -280px; top: 480px; background: radial-gradient(circle, rgba(0,110,230,.1), transparent 68%); }

.site-header, main, footer { width: min(1180px, calc(100% - 48px)); margin: auto; }
.site-header { height: 92px; display: flex; align-items: center; justify-content: space-between; }
.brand { display: inline-flex; align-items: center; gap: 11px; font-weight: 800; letter-spacing: .08em; font-size: 21px; }
.brand img { border-radius: 11px; box-shadow: 0 8px 24px rgba(0, 81, 180, .18); }
.header-badge { padding: 9px 14px; border: 1px solid var(--line); border-radius: 99px; background: rgba(255,255,255,.7); font-size: 13px; color: var(--muted); backdrop-filter: blur(14px); }
.header-badge i { display: inline-block; width: 7px; height: 7px; margin-right: 7px; background: #17b978; border-radius: 50%; box-shadow: 0 0 0 4px rgba(23,185,120,.12); }

.hero { min-height: 650px; display: grid; grid-template-columns: 1.08fr .92fr; align-items: center; gap: 40px; padding: 45px 0 75px; }
.eyebrow { display: flex; align-items: center; gap: 11px; color: var(--blue); font-size: 13px; font-weight: 700; letter-spacing: .2em; }
.eyebrow span { width: 34px; height: 2px; background: linear-gradient(90deg, var(--blue), var(--cyan)); }
h1 { margin: 24px 0; font-size: clamp(52px, 6vw, 82px); line-height: 1.06; letter-spacing: -.055em; }
h1 em { color: transparent; font-style: normal; background: linear-gradient(110deg, var(--blue), var(--cyan)); background-clip: text; -webkit-background-clip: text; }
.lead { max-width: 590px; margin: 0; color: var(--muted); font-size: 17px; line-height: 1.9; }
.download-row { display: flex; align-items: center; gap: 22px; margin-top: 36px; }
.download-button { display: flex; align-items: center; gap: 15px; min-width: 245px; padding: 16px 22px; color: #fff; border-radius: 15px; background: linear-gradient(120deg, #0877eb, #005fc9); box-shadow: 0 16px 38px rgba(0, 104, 220, .28); transition: transform .2s, box-shadow .2s; }
.download-button:hover { transform: translateY(-3px); box-shadow: 0 20px 42px rgba(0, 104, 220, .34); }
.download-button svg { width: 27px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.download-button span { display: grid; gap: 2px; font-size: 17px; font-weight: 750; }
.download-button small { font-size: 11px; font-weight: 500; opacity: .78; }
.file-meta { display: grid; gap: 5px; }
.file-meta strong { font-size: 14px; }
.file-meta span { color: var(--muted); font-size: 12px; }
.trust-row { display: flex; flex-wrap: wrap; gap: 22px; margin-top: 31px; color: #536276; font-size: 12px; }
.trust-row span { display: flex; align-items: center; gap: 7px; }
.trust-row svg { width: 16px; fill: none; stroke: var(--blue); stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }

.hero-visual { position: relative; min-height: 530px; display: grid; place-items: center; }
.orbit { position: absolute; border: 1px solid rgba(0,110,230,.11); border-radius: 50%; }
.orbit-one { width: 420px; height: 420px; }
.orbit-two { width: 510px; height: 510px; border-style: dashed; animation: spin 35s linear infinite; }
.phone { position: relative; width: 247px; height: 500px; padding: 9px; border: 1px solid rgba(255,255,255,.8); border-radius: 38px; background: #071425; box-shadow: 0 45px 75px rgba(7,20,37,.28), inset 0 0 0 1px rgba(255,255,255,.16); transform: rotate(4deg); z-index: 2; }
.phone::before { content: ""; position: absolute; width: 75px; height: 19px; top: 13px; left: 50%; transform: translateX(-50%); background: #071425; border-radius: 0 0 12px 12px; z-index: 3; }
.phone-screen { height: 100%; padding: 18px 20px; color: #fff; border-radius: 30px; overflow: hidden; background: radial-gradient(circle at 80% 10%, rgba(0,210,235,.5), transparent 30%), linear-gradient(155deg, #0072e7 5%, #082b5d 58%, #071425); }
.phone-status { display: flex; justify-content: space-between; font-size: 9px; opacity: .8; }
.app-mark { width: 58px; height: 58px; margin-top: 65px; padding: 3px; border-radius: 17px; background: rgba(255,255,255,.93); box-shadow: 0 13px 30px rgba(0,0,0,.14); }
.app-mark img { width: 100%; border-radius: 14px; }
.phone-screen > p { margin: 17px 0 5px; font-size: 12px; letter-spacing: .22em; opacity: .66; }
.phone-screen > strong { font-size: 28px; line-height: 1.25; letter-spacing: -.03em; }
.screen-card { display: grid; gap: 7px; margin-top: 68px; padding: 18px; border: 1px solid rgba(255,255,255,.15); border-radius: 18px; background: rgba(255,255,255,.1); backdrop-filter: blur(12px); }
.screen-card span { font-size: 10px; opacity: .65; }
.screen-card b { font-size: 12px; }
.screen-card i { width: 48px; height: 3px; margin-top: 7px; border-radius: 3px; background: linear-gradient(90deg, #fff, transparent); }
.float-chip { position: absolute; display: flex; align-items: center; gap: 11px; padding: 13px 16px; border: 1px solid rgba(255,255,255,.8); border-radius: 14px; background: rgba(255,255,255,.8); box-shadow: 0 16px 38px rgba(20,45,75,.12); backdrop-filter: blur(14px); z-index: 3; }
.chip-top { right: -3px; top: 88px; }
.chip-top i { width: 11px; height: 32px; border-radius: 4px; background: linear-gradient(var(--cyan), var(--blue)); }
.chip-top span { color: var(--muted); font-size: 9px; line-height: 1.35; }
.chip-top b { color: var(--ink); font-size: 12px; }
.chip-bottom { left: -10px; bottom: 86px; color: #24405e; font-size: 11px; }
.chip-bottom svg { width: 24px; padding: 5px; border-radius: 50%; background: #e1f9f3; fill: none; stroke: #10a67b; stroke-width: 2.3; }
@keyframes spin { to { transform: rotate(360deg); } }

.features { display: grid; grid-template-columns: repeat(3, 1fr); border: 1px solid var(--line); border-radius: 22px; background: rgba(255,255,255,.72); box-shadow: 0 18px 50px rgba(27,55,85,.06); overflow: hidden; }
.features article { position: relative; padding: 38px; }
.features article + article { border-left: 1px solid var(--line); }
.feature-number { position: absolute; right: 24px; top: 21px; color: rgba(0,110,230,.17); font-size: 30px; font-weight: 800; }
.feature-icon { display: grid; place-items: center; width: 46px; height: 46px; border-radius: 13px; background: #eaf4ff; }
.feature-icon svg { width: 23px; fill: none; stroke: var(--blue); stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.features h2 { margin: 22px 0 10px; font-size: 18px; }
.features p { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.75; }

.install-guide { display: grid; grid-template-columns: .8fr 1.2fr; gap: 80px; align-items: start; padding: 120px 0 95px; }
.section-label { color: var(--blue); font-size: 11px; font-weight: 800; letter-spacing: .2em; }
.install-guide h2 { margin: 14px 0; font-size: 36px; letter-spacing: -.04em; }
.install-guide > div p { color: var(--muted); font-size: 14px; line-height: 1.8; }
.install-guide ol { margin: 0; padding: 0; list-style: none; }
.install-guide li { display: flex; align-items: center; gap: 19px; padding: 22px 0; border-bottom: 1px solid var(--line); }
.install-guide li:first-child { padding-top: 0; }
.install-guide li > b { display: grid; place-items: center; width: 38px; height: 38px; flex: 0 0 auto; color: var(--blue); border-radius: 50%; background: #e8f3ff; font-size: 13px; }
.install-guide li span { display: grid; gap: 5px; }
.install-guide li strong { font-size: 14px; }
.install-guide li small { color: var(--muted); font-size: 12px; }
.checksum { display: flex; justify-content: space-between; align-items: center; gap: 20px; padding: 22px 25px; border: 1px solid var(--line); border-radius: 16px; background: #eef3f7; }
.checksum div { min-width: 0; display: grid; gap: 8px; }
.checksum span { color: var(--muted); font-size: 10px; font-weight: 700; letter-spacing: .13em; }
.checksum code { max-width: 760px; overflow: hidden; text-overflow: ellipsis; color: #33465a; font-size: 11px; }
.checksum button { flex: 0 0 auto; padding: 9px 14px; color: var(--blue); border: 0; border-radius: 9px; background: #fff; cursor: pointer; font: inherit; font-size: 12px; box-shadow: 0 5px 15px rgba(20,45,70,.06); }
footer { display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: 20px; padding: 60px 0 35px; color: #8090a0; font-size: 11px; }
footer > span { justify-self: end; }
.footer-brand { color: var(--ink); font-size: 16px; }
.footer-brand img { border-radius: 9px; }
.toast { position: fixed; left: 50%; bottom: 28px; padding: 11px 17px; color: #fff; border-radius: 10px; background: rgba(7,20,37,.92); font-size: 12px; transform: translate(-50%, 20px); opacity: 0; transition: .25s; pointer-events: none; }
.toast.show { opacity: 1; transform: translate(-50%, 0); }

@media (max-width: 880px) {
  .hero { grid-template-columns: 1fr; padding-top: 35px; text-align: center; }
  .hero-copy { display: grid; justify-items: center; }
  .eyebrow { justify-content: center; }
  .lead { max-width: 640px; }
  .hero-visual { margin-top: 15px; }
  .features { grid-template-columns: 1fr; }
  .features article + article { border-left: 0; border-top: 1px solid var(--line); }
  .install-guide { grid-template-columns: 1fr; gap: 40px; }
}
@media (max-width: 600px) {
  .site-header, main, footer { width: min(100% - 30px, 1180px); }
  .site-header { height: 76px; }
  .header-badge { font-size: 11px; }
  h1 { margin: 18px 0; font-size: clamp(40px, 12.2vw, 50px); letter-spacing: -.065em; }
  .lead { font-size: 15px; }
  .download-row { width: 100%; flex-direction: column; gap: 13px; }
  .download-button { width: 100%; justify-content: center; }
  .file-meta { grid-auto-flow: column; gap: 10px; align-items: center; }
  .trust-row { justify-content: center; gap: 13px; }
  .hero-visual { min-height: 485px; transform: scale(.9); margin: -10px 0 -30px; }
  .orbit-one { width: 380px; height: 380px; }
  .orbit-two { width: 450px; height: 450px; }
  .chip-top { right: -20px; }
  .chip-bottom { left: -24px; }
  .features article { padding: 30px; }
  .install-guide { padding: 80px 0 65px; }
  .install-guide h2 { font-size: 30px; }
  .checksum { align-items: flex-start; flex-direction: column; }
  .checksum button { width: 100%; }
  footer { grid-template-columns: 1fr 1fr; padding-top: 45px; }
  footer p { display: none; }
}
@media (max-width: 420px) {
  .header-badge { display: none; }
  .lead { max-width: 340px; font-size: 14px; }
  .trust-row { font-size: 11px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .orbit-two { animation: none; }
  * { transition: none !important; }
}