:root {
  color-scheme: dark;
  --bg: #07090c;
  --surface: #10141a;
  --surface-2: #161c24;
  --text: #f5f7fa;
  --muted: #9ba6b4;
  --line: rgba(255, 255, 255, 0.10);
  --brand: #0a84ff;
  --brand-light: #53b8ff;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at 83% 12%, rgba(10, 132, 255, 0.15), transparent 27rem),
    radial-gradient(circle at 12% 42%, rgba(83, 184, 255, 0.07), transparent 24rem),
    var(--bg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.6;
}

a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }

.site-header {
  position: sticky;
  z-index: 20;
  top: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
  background: rgba(7, 9, 12, 0.78);
  backdrop-filter: blur(22px);
}

.brand, .footer-brand { display: flex; align-items: center; gap: 9px; }
.brand img { border-radius: 12px; box-shadow: 0 10px 28px rgba(10, 132, 255, 0.22); }
.brand span { display: flex; align-items: baseline; gap: 2px; font-size: 20px; }
.brand b, .footer-brand b { letter-spacing: 0.02em; }
.brand strong, .footer-brand strong { font-family: "Arial Black", sans-serif; letter-spacing: -0.05em; }

nav { display: flex; align-items: center; gap: 28px; color: #c7cdd5; font-size: 14px; }
nav a:hover { color: white; }
.nav-cta { padding: 9px 16px; border: 1px solid rgba(83, 184, 255, 0.42); border-radius: 999px; color: white; background: rgba(10, 132, 255, 0.13); }

main, footer { width: min(1180px, calc(100% - 40px)); margin: 0 auto; }
.hero { min-height: 760px; display: grid; grid-template-columns: 1.05fr 0.95fr; align-items: center; gap: 72px; padding: 80px 0 70px; }
.eyebrow { margin: 0 0 18px; color: var(--brand-light); font-size: 12px; font-weight: 750; letter-spacing: 0.16em; text-transform: uppercase; }
h1 { margin: 0; font-size: clamp(54px, 7vw, 92px); line-height: 1.04; letter-spacing: -0.065em; }
h1 span { color: transparent; background: linear-gradient(105deg, #fff 16%, #77c5ff 62%, #0a84ff); background-clip: text; }
.intro { max-width: 630px; margin: 30px 0 0; color: #bdc6d1; font-size: 19px; line-height: 1.85; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 34px; }
.button { padding: 13px 22px; border-radius: 999px; font-size: 15px; font-weight: 680; transition: transform .2s ease, border-color .2s ease; }
.button:hover { transform: translateY(-2px); }
.primary { background: linear-gradient(120deg, var(--brand), #3aa7ff); box-shadow: 0 16px 42px rgba(10, 132, 255, 0.26); }
.secondary { border: 1px solid var(--line); background: rgba(255,255,255,.035); }
.boundary { margin-top: 24px; color: #778392; font-size: 13px; }

.hero-visual { position: relative; min-height: 640px; display: grid; place-items: center; overflow: hidden; }
.glow { position: absolute; width: 440px; height: 440px; border-radius: 50%; background: radial-gradient(circle, rgba(10,132,255,.34), rgba(10,132,255,0) 68%); filter: blur(18px); }
.phone { position: relative; width: 314px; max-height: 642px; object-fit: cover; object-position: top; border: 8px solid #1e232b; border-radius: 52px; box-shadow: 0 50px 100px rgba(0,0,0,.55), 0 0 0 1px rgba(255,255,255,.18); transform: rotate(3deg); }

.trust-strip { display: grid; grid-template-columns: repeat(4, 1fr); border: 1px solid var(--line); border-radius: 28px; background: rgba(255,255,255,.025); }
.trust-strip div { padding: 24px 26px; border-right: 1px solid var(--line); }
.trust-strip div:last-child { border: 0; }
.trust-strip strong, .trust-strip span { display: block; }
.trust-strip strong { margin-bottom: 5px; font-size: 15px; }
.trust-strip span { color: var(--muted); font-size: 13px; }

.section { padding: 120px 0 20px; }
.section-heading { max-width: 720px; margin-bottom: 50px; }
h2 { margin: 0; font-size: clamp(36px, 4.4vw, 58px); line-height: 1.14; letter-spacing: -0.045em; }
.section-heading > p:last-child { color: var(--muted); font-size: 17px; }
.feature-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.feature-grid article { min-height: 250px; padding: 28px; border: 1px solid var(--line); border-radius: 24px; background: linear-gradient(145deg, rgba(255,255,255,.05), rgba(255,255,255,.015)); }
.feature-grid article span { color: var(--brand-light); font-size: 12px; font-weight: 750; }
.feature-grid h3 { margin: 54px 0 10px; font-size: 22px; }
.feature-grid p { margin: 0; color: var(--muted); font-size: 14px; }

.screens-section { overflow: hidden; }
.screen-grid { display: grid; grid-template-columns: repeat(3, 1fr); align-items: start; gap: 32px; }
.screen-grid figure { margin: 0; }
.screen-grid img { width: 100%; max-height: 640px; object-fit: cover; object-position: top; border: 1px solid rgba(255,255,255,.14); border-radius: 34px; box-shadow: 0 32px 72px rgba(0,0,0,.32); }
.screen-grid figure:nth-child(2) { margin-top: 72px; }
.screen-grid figcaption { margin-top: 16px; color: #cbd2da; text-align: center; font-size: 14px; }

.about-section { display: grid; grid-template-columns: .8fr 1.2fr; gap: 80px; padding-bottom: 100px; }
.about-copy > p { margin: 0 0 34px; color: #b9c3cf; font-size: 18px; line-height: 1.85; }
dl { margin: 0; border-top: 1px solid var(--line); }
dl div { display: grid; grid-template-columns: 140px 1fr; padding: 16px 0; border-bottom: 1px solid var(--line); }
dt { color: #778392; }
dd { margin: 0; }
dd a { color: var(--brand-light); }

footer { display: grid; grid-template-columns: 1fr auto; gap: 24px; align-items: center; padding: 38px 0 46px; border-top: 1px solid var(--line); color: var(--muted); font-size: 13px; }
.footer-brand { color: white; font-size: 18px; }
.footer-brand span { margin-left: 8px; color: var(--muted); font-size: 12px; }
.footer-links { display: flex; gap: 22px; }
footer > p { grid-column: 1 / -1; margin: 0; }

@media (max-width: 900px) {
  nav a:not(.nav-cta) { display: none; }
  .hero { grid-template-columns: 1fr; padding-top: 64px; gap: 24px; }
  .hero-visual { min-height: 570px; }
  .trust-strip { grid-template-columns: repeat(2, 1fr); }
  .trust-strip div:nth-child(2) { border-right: 0; }
  .trust-strip div:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .about-section { grid-template-columns: 1fr; gap: 30px; }
}

@media (max-width: 620px) {
  .site-header, main, footer { width: min(100% - 28px, 1180px); }
  .site-header { padding: 13px 0; }
  .brand img { width: 38px; height: 38px; }
  .brand span { font-size: 17px; }
  .nav-cta { padding: 8px 13px; }
  .hero { min-height: auto; padding: 60px 0 40px; }
  h1 { font-size: 50px; }
  .intro { font-size: 16px; }
  .hero-actions { flex-direction: column; }
  .button { text-align: center; }
  .hero-visual { min-height: 500px; }
  .phone { width: 248px; max-height: 510px; border-radius: 42px; }
  .trust-strip, .feature-grid { grid-template-columns: 1fr; }
  .trust-strip div, .trust-strip div:nth-child(2) { border-right: 0; border-bottom: 1px solid var(--line); }
  .trust-strip div:last-child { border-bottom: 0; }
  .section { padding-top: 88px; }
  .screen-grid { grid-template-columns: 1fr; gap: 24px; }
  .screen-grid figure:nth-child(2) { margin-top: 0; }
  .screen-grid img { max-height: 640px; }
  dl div { grid-template-columns: 110px 1fr; }
  footer { grid-template-columns: 1fr; }
  .footer-links { flex-wrap: wrap; }
}