:root {
  --bg: #0b0b0d;
  --fg: #f5f5f7;
  --muted: #a1a1a6;
  --line: rgba(255,255,255,.08);
  --accent: #f5f5f7;
  --radius: 18px;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Helvetica Neue", Arial, sans-serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--bg); color: var(--fg); -webkit-font-smoothing: antialiased; }
a { color: inherit; }
img { max-width: 100%; display: block; }

.nav {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px clamp(20px, 5vw, 56px);
  background: rgba(11,11,13,.72); backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; font-weight: 600; font-size: 17px; }
.brand img { width: 28px; height: 28px; }
.nav nav { display: flex; align-items: center; gap: 22px; font-size: 14px; }
.nav nav a { text-decoration: none; color: var(--muted); }
.nav nav a:hover { color: var(--fg); }
.lang {
  font: inherit; font-size: 12px; font-weight: 600; color: var(--fg);
  background: transparent; border: 1px solid var(--line); border-radius: 999px;
  padding: 4px 10px; cursor: pointer;
}

.hero { text-align: center; padding: clamp(56px, 9vw, 110px) 20px 40px; }
.hero-logo { width: 112px; height: 112px; margin: 0 auto 28px; filter: drop-shadow(0 12px 30px rgba(0,0,0,.6)); }
h1 { font-size: clamp(40px, 6.4vw, 76px); line-height: 1.04; letter-spacing: -.035em; margin: 0 0 20px; font-weight: 700; }
.lead { font-size: clamp(17px, 2vw, 21px); line-height: 1.45; color: var(--muted); max-width: 640px; margin: 0 auto 34px; }
.cta { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 13px 24px; border-radius: 999px; font-size: 16px; font-weight: 600; text-decoration: none;
  transition: transform .15s ease, background .15s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn.primary { background: var(--accent); color: #000; }
.btn.ghost { border: 1px solid rgba(255,255,255,.18); }
.btn.ghost:hover { background: rgba(255,255,255,.06); }
.req { color: var(--muted); font-size: 13px; margin: 18px 0 56px; }
.hero-shot {
  width: min(1200px, 100%); margin: 0 auto; border-radius: var(--radius);
  box-shadow: 0 40px 120px rgba(0,0,0,.7), 0 0 0 1px var(--line);
}
.hero-video {
  position: relative; width: min(1200px, 100%); margin: 0 auto; aspect-ratio: 16 / 9;
  border-radius: var(--radius); overflow: hidden; background: #000;
  box-shadow: 0 40px 120px rgba(0,0,0,.7), 0 0 0 1px var(--line);
}
.hero-video video { width: 100%; height: 100%; display: block; object-fit: cover; }
.vtoggle {
  position: absolute; right: 16px; bottom: 16px; width: 38px; height: 38px;
  border-radius: 999px; border: 1px solid rgba(255,255,255,.2); cursor: pointer;
  background: rgba(0,0,0,.45); color: #fff; font-size: 13px; backdrop-filter: blur(10px);
  opacity: 0; transition: opacity .2s ease;
}
.hero-video:hover .vtoggle, .vtoggle:focus-visible { opacity: 1; }
@media (hover: none) { .vtoggle { opacity: .8; } }

.features { max-width: 1200px; margin: 0 auto; padding: 60px 20px; display: grid; gap: 110px; }
.feature { display: grid; grid-template-columns: 1fr 1.6fr; gap: 56px; align-items: center; }
.feature:nth-child(even) { grid-template-columns: 1.6fr 1fr; }
.feature:nth-child(even) .copy { order: 2; }
.feature h2 { font-size: clamp(28px, 3.4vw, 42px); letter-spacing: -.025em; line-height: 1.1; margin: 0 0 14px; }
.feature p { color: var(--muted); font-size: 18px; line-height: 1.5; margin: 0; }
.feature img { border-radius: 14px; box-shadow: 0 24px 70px rgba(0,0,0,.6), 0 0 0 1px var(--line); }

.install { max-width: 720px; margin: 40px auto 0; padding: 60px 20px; text-align: center; border-top: 1px solid var(--line); }
.install h2 { font-size: 34px; letter-spacing: -.02em; margin: 0 0 28px; }
.install ol { text-align: left; display: inline-block; margin: 0; padding-left: 22px; font-size: 18px; line-height: 2; }
.install .note { color: var(--muted); font-size: 14px; margin-top: 26px; }

footer { text-align: center; padding: 50px 20px 60px; color: var(--muted); font-size: 13px; border-top: 1px solid var(--line); }
footer a { color: var(--muted); }
footer .fine { font-size: 11px; opacity: .7; }

.doc { max-width: 760px; margin: 0 auto; padding: 60px 20px 40px; line-height: 1.6; }
.doc h1 { font-size: 44px; }
.doc h2 { font-size: 22px; margin-top: 36px; }
.doc p, .doc li { color: #d2d2d7; font-size: 16px; }
.doc .updated { color: var(--muted); font-size: 14px; }

@media (max-width: 820px) {
  .feature, .feature:nth-child(even) { grid-template-columns: 1fr; gap: 24px; }
  .feature:nth-child(even) .copy { order: 0; }
  .nav nav a:not(:last-of-type) { display: none; }
}