:root {
  --bg: #07101f;
  --bg-soft: #0b1729;
  --panel: rgba(16, 30, 51, 0.78);
  --panel-solid: #101e33;
  --line: rgba(148, 163, 184, 0.2);
  --text: #f7fbff;
  --muted: #a9b7ca;
  --brand: #68a7ff;
  --brand-2: #78e6c2;
  --warning: #ffd166;
  --radius: 22px;
  --shadow: 0 18px 70px rgba(0, 0, 0, 0.26);
  --max: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  position: relative;
  color: var(--text);
  background:
    radial-gradient(circle at 8% 8%, rgba(104, 167, 255, 0.14), transparent 28%),
    radial-gradient(circle at 92% 18%, rgba(120, 230, 194, 0.1), transparent 25%),
    var(--bg);
  font-family: Inter, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.7;
}
#particle-field {
  position: fixed;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  opacity: .6;
}
main, .site-footer { position: relative; z-index: 1; }
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: .28;
  background-image:
    linear-gradient(rgba(255,255,255,.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.025) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: linear-gradient(to bottom, black, transparent 75%);
}
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
button { font: inherit; }
.container { width: min(calc(100% - 36px), var(--max)); margin-inline: auto; }
.skip-link {
  position: fixed; left: 14px; top: -60px; z-index: 100;
  background: var(--text); color: var(--bg); padding: 8px 14px; border-radius: 10px;
}
.skip-link:focus { top: 12px; }
.site-header {
  position: sticky; top: 0; z-index: 50;
  border-bottom: 1px solid var(--line);
  background: rgba(7, 16, 31, .82);
  backdrop-filter: blur(18px);
}
.nav { min-height: 74px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.logo { display: inline-flex; align-items: center; gap: 11px; font-size: 1.06rem; font-weight: 800; letter-spacing: -.02em; }
.logo-mark {
  width: 34px; height: 34px; display: grid; place-items: center;
  color: #07101f; background: var(--brand-2); border-radius: 11px; font-weight: 900;
}
.nav-links { display: flex; align-items: center; gap: 8px; }
.nav-links a { padding: 9px 12px; color: var(--muted); border-radius: 10px; font-size: .94rem; }
.nav-links a:hover, .nav-links a[aria-current="page"] { color: var(--text); background: rgba(255,255,255,.07); }
.nav-links .nav-cta { color: #07101f; background: var(--brand); font-weight: 800; }
.menu-toggle {
  display: none; color: var(--text); background: transparent; border: 1px solid var(--line);
  border-radius: 10px; padding: 8px 11px; cursor: pointer;
}
.hero { padding: 86px 0 54px; }
.hero-grid { display: grid; grid-template-columns: 1.08fr .92fr; gap: 54px; align-items: center; }
.eyebrow, .tag {
  display: inline-flex; align-items: center; gap: 8px; width: fit-content;
  padding: 7px 11px; border: 1px solid rgba(120,230,194,.28);
  border-radius: 999px; background: rgba(120,230,194,.08);
  color: var(--brand-2); font-weight: 750; font-size: .82rem;
}
.eyebrow::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: currentColor; }
h1, h2, h3 { margin: 0; line-height: 1.16; letter-spacing: -.035em; }
h1 { margin-top: 20px; font-size: clamp(2.65rem, 6vw, 5.4rem); max-width: 850px; }
h2 { font-size: clamp(2rem, 4vw, 3.25rem); }
h3 { font-size: 1.14rem; letter-spacing: -.015em; }
.lead { max-width: 700px; margin: 22px 0 0; color: var(--muted); font-size: 1.08rem; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
.button {
  display: inline-flex; min-height: 48px; align-items: center; justify-content: center;
  padding: 11px 18px; border: 1px solid var(--line); border-radius: 13px;
  background: rgba(255,255,255,.05); font-weight: 800; transition: .2s ease;
}
.button:hover { transform: translateY(-2px); border-color: rgba(104,167,255,.55); }
.button.primary { color: #07101f; border-color: transparent; background: var(--brand); }
.button.small { min-height: 40px; padding: 8px 14px; font-size: .9rem; }
.hero-visual, .media-frame {
  position: relative; overflow: hidden; padding: 12px;
  border: 1px solid var(--line); border-radius: 28px;
  background: rgba(255,255,255,.045); box-shadow: var(--shadow);
}
.hero-visual::after {
  content: "跨平台控制中心"; position: absolute; right: 24px; bottom: 22px;
  padding: 6px 10px; border-radius: 9px; background: rgba(7,16,31,.82);
  border: 1px solid var(--line); color: var(--muted); font-size: .78rem;
}
.hero-visual img, .media-frame img { width: 100%; border-radius: 18px; }
.metrics { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-top: 34px; }
.metric { padding: 16px; border-top: 1px solid var(--line); }
.metric strong { display: block; font-size: 1.15rem; }
.metric span { color: var(--muted); font-size: .84rem; }
.portal-strip { padding: 20px 0 54px; }
.portal-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.portal-link {
  min-height: 120px; padding: 20px; border: 1px solid var(--line);
  border-radius: 18px; background: var(--panel); backdrop-filter: blur(16px);
}
.portal-link span { display: block; color: var(--brand); font-size: .8rem; font-weight: 800; text-transform: uppercase; }
.portal-link strong { display: block; margin-top: 8px; font-size: 1.08rem; }
.portal-link p { margin: 6px 0 0; color: var(--muted); font-size: .86rem; }
section { padding: 78px 0; }
.section-head { display: flex; align-items: end; justify-content: space-between; gap: 22px; margin-bottom: 30px; }
.section-head p { max-width: 580px; margin: 0; color: var(--muted); }
.bento { display: grid; grid-template-columns: repeat(12, 1fr); gap: 16px; }
.card {
  grid-column: span 3; padding: 24px; border: 1px solid var(--line);
  border-radius: var(--radius); background: var(--panel); backdrop-filter: blur(16px);
}
.card.wide { grid-column: span 6; }
.card.tall { grid-row: span 2; }
.card.accent { background: rgba(104,167,255,.1); }
.card p { margin: 10px 0 0; color: var(--muted); font-size: .94rem; }
.icon {
  width: 42px; height: 42px; display: grid; place-items: center; margin-bottom: 22px;
  border-radius: 13px; color: var(--brand); background: rgba(104,167,255,.12);
  font-weight: 900;
}
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; align-items: center; }
.brand-visual { display: grid; min-height: 390px; place-items: center; }
.brand-visual img { width: min(72%, 300px); height: auto; margin: auto; }
.check-list { display: grid; gap: 12px; padding: 0; margin: 24px 0 0; list-style: none; }
.check-list li { position: relative; padding-left: 28px; color: var(--muted); }
.check-list li::before { content: "✓"; position: absolute; left: 0; color: var(--brand-2); font-weight: 900; }
.platforms { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.platform {
  padding: 24px; border-radius: var(--radius); border: 1px solid var(--line); background: var(--panel);
}
.platform .os { color: var(--brand-2); font-size: .8rem; font-weight: 800; }
.platform p, .platform li { color: var(--muted); font-size: .9rem; }
.platform ul { padding-left: 18px; }
.keyword-cloud { display: flex; flex-wrap: wrap; gap: 10px; }
.keyword-cloud span { padding: 8px 12px; border: 1px solid var(--line); border-radius: 999px; color: var(--muted); font-size: .85rem; }
.faq { display: grid; gap: 12px; max-width: 900px; margin: 0 auto; }
details { border: 1px solid var(--line); border-radius: 16px; background: var(--panel); }
summary { padding: 18px 20px; cursor: pointer; font-weight: 800; }
details p { margin: 0; padding: 0 20px 20px; color: var(--muted); }
.page-hero { padding: 68px 0 28px; }
.page-hero h1 { font-size: clamp(2.45rem, 5vw, 4.5rem); }
.breadcrumbs { display: flex; gap: 8px; color: var(--muted); font-size: .85rem; }
.breadcrumbs a { color: var(--brand); }
.download-list { display: grid; gap: 14px; }
.download-row {
  display: grid; grid-template-columns: 1.3fr .7fr .8fr auto; gap: 16px; align-items: center;
  padding: 18px; border: 1px solid var(--line); border-radius: 16px; background: var(--panel);
}
.download-row span { color: var(--muted); font-size: .9rem; }
.code {
  overflow: auto; padding: 16px; border: 1px solid var(--line); border-radius: 14px;
  background: #050b15; color: #cce0ff; font: .88rem/1.65 Consolas, monospace;
}
.timeline { display: grid; gap: 0; }
.timeline-item { display: grid; grid-template-columns: 120px 1fr; gap: 22px; padding: 22px 0; border-bottom: 1px solid var(--line); }
.timeline-item time { color: var(--brand-2); font-weight: 800; }
.notice { padding: 18px 20px; border-left: 3px solid var(--warning); border-radius: 0 14px 14px 0; background: rgba(255,209,102,.08); color: var(--muted); }
.article { max-width: 860px; }
.article h2 { margin-top: 56px; font-size: 2rem; }
.article h3 { margin-top: 34px; }
.article p, .article li { color: var(--muted); }
.article img { margin: 28px 0; border: 1px solid var(--line); border-radius: 20px; }
.step { display: grid; grid-template-columns: 44px 1fr; gap: 16px; margin-top: 24px; }
.step-number { width: 38px; height: 38px; display: grid; place-items: center; border-radius: 12px; background: var(--brand); color: #07101f; font-weight: 900; }
.site-footer { margin-top: 56px; padding: 58px 0 24px; border-top: 1px solid var(--line); background: rgba(5,11,21,.48); }
.footer-grid { display: grid; grid-template-columns: 1.6fr repeat(3, 1fr); gap: 34px; }
.footer-title { margin: 0 0 12px; font-weight: 800; }
.footer-links { display: grid; gap: 8px; }
.footer-links a, .footer-note { color: var(--muted); font-size: .88rem; }
.footer-links a:hover { color: var(--text); }
.copyright { display: flex; justify-content: space-between; gap: 20px; margin-top: 38px; padding-top: 22px; border-top: 1px solid var(--line); color: var(--muted); font-size: .82rem; }

@media (max-width: 900px) {
  .hero-grid, .two-col { grid-template-columns: 1fr; }
  .hero-visual { order: -1; }
  .portal-grid, .platforms { grid-template-columns: repeat(2, 1fr); }
  .card { grid-column: span 6; }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
  .download-row { grid-template-columns: 1fr 1fr; }
  .nav-links {
    display: none; position: absolute; left: 18px; right: 18px; top: 68px; padding: 12px;
    flex-direction: column; align-items: stretch; border: 1px solid var(--line);
    border-radius: 16px; background: #0b1729;
  }
  .nav-links.open { display: flex; }
  .menu-toggle { display: block; }
}
@media (max-width: 620px) {
  .container { width: min(calc(100% - 24px), var(--max)); }
  .hero { padding-top: 52px; }
  h1 { font-size: 2.45rem; }
  section { padding: 56px 0; }
  .metrics, .portal-grid, .platforms, .footer-grid { grid-template-columns: 1fr; }
  .bento { display: block; }
  .card { margin-bottom: 14px; }
  .section-head { align-items: start; flex-direction: column; }
  .download-row, .timeline-item { grid-template-columns: 1fr; }
  .copyright { flex-direction: column; }
}

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