:root {
  --ink: #101229;
  --ink-soft: #25284a;
  --paper: #f7f8ff;
  --line: #dfe3f5;
  --muted: #68708d;
  --cyan: #71e4ff;
  --violet: #7658ff;
  --coral: #ff8067;
  --mint: #baf6e7;
  --shadow: 0 18px 50px rgba(16, 18, 41, .13);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; font-family: "Segoe UI", "Microsoft YaHei", sans-serif; color: var(--ink); background: var(--paper); line-height: 1.7; overflow-x: hidden; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
.wrap { width: min(1160px, calc(100% - 40px)); margin: 0 auto; min-width: 0; }
.topbar { position: sticky; top: 0; z-index: 20; background: rgba(16, 18, 41, .94); color: #fff; backdrop-filter: blur(16px); border-bottom: 1px solid rgba(255,255,255,.12); }
.nav { height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 28px; }
.brand { display: inline-flex; align-items: center; gap: 12px; font-size: 20px; font-weight: 800; letter-spacing: .02em; }
.brand img { width: 38px; height: 38px; border-radius: 12px; }
.nav-links { display: flex; align-items: center; gap: 24px; font-size: 14px; color: #d7dbf3; }
.nav-links a { transition: color .2s ease; }
.nav-links a:hover, .nav-links a[aria-current="page"] { color: var(--cyan); }
.nav-download { padding: 9px 15px; border: 1px solid rgba(113,228,255,.55); border-radius: 999px; color: var(--cyan) !important; }
.menu-toggle { display: none; border: 0; background: transparent; color: white; font-size: 24px; cursor: pointer; }
.hero { background: radial-gradient(circle at 88% 8%, rgba(118,88,255,.52), transparent 35%), linear-gradient(135deg, #101229 0%, #171a3a 58%, #202952 100%); color: white; overflow: hidden; }
.hero-grid { display: grid; grid-template-columns: 1.06fr .94fr; gap: 64px; align-items: center; min-height: 650px; padding: 76px 0 82px; }
.eyebrow { margin: 0 0 18px; color: var(--cyan); font-size: 13px; text-transform: uppercase; letter-spacing: .16em; font-weight: 800; }
h1, h2, h3 { margin: 0; line-height: 1.17; letter-spacing: -.02em; }
h1 { font-size: clamp(40px, 6vw, 72px); max-width: 650px; }
.hero-copy { width: 100%; margin: 24px 0 30px; max-width: 620px; color: #d4d8ef; font-size: 18px; overflow-wrap: anywhere; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 9px; min-height: 48px; padding: 0 21px; border-radius: 13px; border: 1px solid transparent; font-weight: 750; cursor: pointer; transition: transform .2s ease, box-shadow .2s ease; }
.btn:hover { transform: translateY(-2px); box-shadow: 0 10px 24px rgba(0,0,0,.18); }
.btn-primary { background: var(--cyan); color: var(--ink); }
.btn-ghost { color: white; border-color: rgba(255,255,255,.28); }
.hero-note { margin-top: 15px; color: #aeb5d5; font-size: 13px; }
.device-stack { position: relative; min-height: 500px; display: grid; place-items: center; min-width: 0; overflow: hidden; }
.device { width: min(300px, 74%); border: 9px solid #292c4e; border-radius: 30px; box-shadow: 0 28px 60px rgba(0,0,0,.4); transform: rotate(5deg); }
.device-back { position: absolute; width: min(245px, 60%); right: 3%; top: 60px; opacity: .66; transform: rotate(-9deg); filter: saturate(.8); }
.device-front { position: relative; z-index: 2; }
.orbital { position: absolute; width: 410px; height: 410px; border: 1px solid rgba(113,228,255,.25); border-radius: 50%; }
.orbital::after { content: ""; position: absolute; inset: 42px; border: 1px dashed rgba(255,128,103,.4); border-radius: 50%; }
.signal { position: absolute; left: 2%; bottom: 8%; padding: 12px 16px; background: rgba(255,255,255,.1); border: 1px solid rgba(255,255,255,.2); border-radius: 14px; backdrop-filter: blur(12px); color: #eef0ff; font-size: 13px; }
.section { padding: 94px 0; }
.section.alt { background: white; }
.section-head { display: flex; justify-content: space-between; align-items: end; gap: 24px; margin-bottom: 35px; }
.section-kicker { color: var(--violet); font-size: 13px; letter-spacing: .14em; font-weight: 800; text-transform: uppercase; }
h2 { font-size: clamp(30px, 4vw, 46px); }
.section-head .side-note { max-width: 350px; color: var(--muted); font-size: 14px; }
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.feature { padding: 26px; border: 1px solid var(--line); border-radius: 18px; background: #fff; box-shadow: 0 6px 22px rgba(28,35,81,.05); }
.feature strong { display: block; margin: 14px 0 8px; font-size: 20px; }
.feature p { margin: 0; color: var(--muted); font-size: 14px; }
.icon-box { width: 44px; height: 44px; display: grid; place-items: center; border-radius: 13px; background: #eafaff; color: var(--violet); font-weight: 900; font-size: 20px; }
.feature:nth-child(2) .icon-box { background: #fff0ec; color: var(--coral); }
.feature:nth-child(3) .icon-box { background: #e9fff8; color: #159e7d; }
.feature:nth-child(4) .icon-box { background: #f1edff; color: var(--violet); }
.feature:nth-child(5) .icon-box { background: #eef3ff; color: #2a73de; }
.feature:nth-child(6) .icon-box { background: #fff8dd; color: #c58b00; }
.gallery { display: grid; grid-template-columns: 1.1fr 1fr 1fr; gap: 18px; align-items: start; }
.shot { padding: 10px; border-radius: 22px; background: #edf0ff; border: 1px solid #dbe0fa; }
.shot img { width: 100%; max-width: 400px; margin: auto; border-radius: 15px; }
.shot figcaption { padding: 12px 5px 2px; font-weight: 700; font-size: 13px; color: var(--ink-soft); }
.shot.tall { grid-row: span 2; }
.statband { background: var(--ink); color: #fff; }
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; padding: 34px 0; }
.stat { border-left: 2px solid var(--cyan); padding-left: 18px; }
.stat b { display: block; color: var(--cyan); font-size: 30px; line-height: 1.1; }
.stat span { color: #b9bfdb; font-size: 13px; }
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; }
.list { display: grid; gap: 15px; margin: 28px 0 0; padding: 0; list-style: none; }
.list li { display: flex; gap: 12px; align-items: flex-start; color: var(--muted); }
.list i { flex: 0 0 auto; display: grid; place-items: center; width: 24px; height: 24px; border-radius: 50%; background: var(--mint); color: var(--ink); font-style: normal; font-weight: 900; font-size: 13px; }
.quote-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.quote { padding: 24px; border-radius: 18px; background: #171a3a; color: #edf0ff; }
.quote p { margin: 0 0 18px; font-size: 16px; }
.quote footer { color: var(--cyan); font-size: 13px; }
.cta { padding: 74px 0; background: linear-gradient(110deg, #dffbff, #ece8ff 55%, #fff0e9); }
.cta-box { display: flex; align-items: center; justify-content: space-between; gap: 28px; }
.cta-box p { margin: 10px 0 0; color: var(--muted); }
.footer { background: #0d0e20; color: #abb2d2; padding: 40px 0 28px; }
.footer-grid { display: grid; grid-template-columns: 1.2fr .8fr 1.1fr; gap: 35px; }
.footer .brand { color: white; }
.footer h3 { margin-bottom: 14px; font-size: 15px; color: #fff; }
.footer p, .footer a { font-size: 13px; color: #abb2d2; }
.footer a:hover { color: var(--cyan); }
.footer-links { display: grid; gap: 5px; }
.copyright { border-top: 1px solid rgba(255,255,255,.1); margin-top: 28px; padding-top: 18px; font-size: 12px; color: #7f87aa; }
.page-hero { background: linear-gradient(130deg, #101229, #27234e 62%, #3c2f67); color: white; padding: 74px 0 70px; }
.page-hero h1 { font-size: clamp(38px, 6vw, 62px); }
.page-hero p { width: 100%; max-width: 720px; color: #d4d8ef; margin: 20px 0 0; font-size: 17px; overflow-wrap: anywhere; }
.article { padding: 76px 0 94px; }
.article-grid { display: grid; grid-template-columns: 1fr 280px; gap: 60px; align-items: start; }
.article-main { min-width: 0; }
.article-main h2 { font-size: 30px; margin: 42px 0 18px; }
.article-main h3 { font-size: 21px; margin: 27px 0 8px; }
.article-main p { margin: 0 0 15px; color: #434b6b; }
.article-main ul { color: #434b6b; padding-left: 22px; }
.aside { position: sticky; top: 102px; padding: 22px; background: #fff; border: 1px solid var(--line); border-radius: 16px; }
.aside strong { display: block; margin-bottom: 12px; }
.aside a { display: block; padding: 8px 0; color: var(--muted); font-size: 14px; border-bottom: 1px solid #edf0fa; }
.aside a:last-child { border-bottom: 0; }
.step-list { display: grid; gap: 18px; margin-top: 26px; }
.step { display: grid; grid-template-columns: 52px 1fr; gap: 18px; padding: 22px; border: 1px solid var(--line); background: #fff; border-radius: 16px; }
.step-no { width: 46px; height: 46px; display: grid; place-items: center; border-radius: 14px; background: var(--ink); color: var(--cyan); font-weight: 900; }
.step h3 { margin: 0 0 5px; font-size: 20px; }
.step p { margin: 0; color: var(--muted); font-size: 14px; }
.note { padding: 20px; border-left: 4px solid var(--coral); background: #fff4f0; border-radius: 0 12px 12px 0; color: #5c3b39; }
.faq-list { display: grid; gap: 12px; margin-top: 25px; }
.faq-item { border: 1px solid var(--line); border-radius: 14px; background: #fff; overflow: hidden; }
.faq-q { width: 100%; display: flex; justify-content: space-between; align-items: center; gap: 15px; border: 0; background: transparent; padding: 18px 20px; color: var(--ink); font: inherit; font-weight: 750; text-align: left; cursor: pointer; }
.faq-q span { font-size: 22px; color: var(--violet); transition: transform .2s ease; }
.faq-a { max-height: 0; overflow: hidden; padding: 0 20px; color: var(--muted); transition: max-height .25s ease, padding .25s ease; }
.faq-item.open .faq-a { max-height: 190px; padding: 0 20px 18px; }
.faq-item.open .faq-q span { transform: rotate(45deg); }
.tag-row { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 20px; }
.tag { padding: 6px 11px; border-radius: 999px; background: #eef0ff; color: #4d4f91; font-size: 12px; }
@media (max-width: 900px) {
  .hero-grid, .split, .article-grid { grid-template-columns: 1fr; }
  .hero-grid > *, .split > *, .article-grid > * { min-width: 0; }
  .hero-grid { gap: 25px; }
  .device-stack { min-height: 420px; }
  .article-grid { gap: 28px; }
  .aside { position: static; order: -1; }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .gallery { grid-template-columns: repeat(2, 1fr); }
  .shot.tall { grid-row: auto; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  .wrap { width: calc(100% - 28px); max-width: 560px; }
  .hero-grid, .hero-grid > div:first-child { width: auto; max-width: none; }
  .hero-copy, .page-hero p { width: auto; max-width: 100%; }
  .nav { height: 66px; }
  .menu-toggle { display: block; margin-left: auto; }
  .nav-links { display: none; position: absolute; left: 0; right: 0; top: 66px; padding: 16px 20px 20px; background: #101229; border-top: 1px solid rgba(255,255,255,.12); flex-direction: column; align-items: flex-start; }
  .nav-links.open { display: flex; }
  .hero-grid { min-height: auto; padding: 58px 0 55px; }
  h1 { font-size: 44px; }
  .hero-copy { font-size: 16px; }
  .section { padding: 65px 0; }
  .section-head { display: block; }
  .section-head .side-note { margin-top: 12px; }
  .feature-grid, .gallery, .quote-grid, .stats { grid-template-columns: 1fr; }
  .gallery .shot img { max-height: 520px; width: auto; }
  .device-stack { min-height: 380px; }
  .device { width: 245px; }
  .device-back { width: 190px; right: 0; }
  .orbital { width: 300px; height: 300px; }
  .cta-box { display: block; }
  .cta-box .btn { margin-top: 20px; }
  .footer-grid { grid-template-columns: 1fr; gap: 22px; }
  .page-hero { padding: 58px 0 52px; }
  .step { grid-template-columns: 42px 1fr; padding: 18px; gap: 13px; }
  .step-no { width: 40px; height: 40px; }
}