:root {
  --bg: #ffffff;
  --bg-soft: #f7f6f3;
  --ink: #1f1f1f;
  --ink-soft: #5c5c57;
  --ink-faint: #8b8b84;
  --line: #e6e4de;
  --accent: #2b7cd3;
  --accent-ink: #1e63b0;
  --danger: #e5484d;
  --radius: 14px;
  --maxw: 1080px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Microsoft YaHei', sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

.nav {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; justify-content: space-between;
  max-width: var(--maxw); margin: 0 auto; padding: 18px 24px;
  background: rgba(255,255,255,.86); backdrop-filter: blur(10px);
  border-bottom: 1px solid transparent;
}
.brand { display: inline-flex; align-items: center; gap: 9px; font-weight: 700; }
.mark {
  display: grid; place-items: center; width: 26px; height: 26px;
  border-radius: 8px; background: var(--ink); color: #fff; font-size: 15px;
}
.nav nav { display: flex; gap: 22px; font-size: 14px; color: var(--ink-soft); }
.nav nav a:hover { color: var(--ink); }

main { max-width: var(--maxw); margin: 0 auto; padding: 0 24px 40px; }
section { padding: 64px 0; border-top: 1px solid var(--line); }
.hero { border-top: 0; padding: 84px 0 72px; }
.eyebrow { margin: 0 0 14px; font-size: 13px; letter-spacing: .08em; color: var(--ink-faint); text-transform: uppercase; }
h1 { margin: 0; font-size: clamp(32px, 5vw, 52px); line-height: 1.18; letter-spacing: -.02em; }
.lede { max-width: 34em; margin: 20px 0 0; font-size: 18px; color: var(--ink-soft); }
.cta { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
.btn {
  display: inline-flex; align-items: center; height: 44px; padding: 0 20px;
  border: 1px solid var(--line); border-radius: 10px; font-size: 15px; font-weight: 500;
  background: #fff; transition: .15s;
}
.btn:hover { border-color: #cfccc4; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.primary:hover { background: var(--accent-ink); border-color: var(--accent-ink); }

.three { display: grid; gap: 28px; grid-template-columns: repeat(3, 1fr); }
.three h3 { margin: 0 0 8px; font-size: 18px; }
.three p { margin: 0 0 8px; color: var(--ink-soft); font-size: 15px; }
.hint { color: var(--ink-faint); font-size: 13px; }

.shot { display: grid; gap: 36px; grid-template-columns: 1.4fr 1fr; align-items: center; }
.shot img { border: 1px solid var(--line); border-radius: var(--radius); box-shadow: 0 18px 40px rgba(20,20,20,.08); }
.shot h2, .split h2, .local h2, .download h2 { margin: 0 0 14px; font-size: 26px; letter-spacing: -.01em; }
.shot ul { margin: 0; padding-left: 18px; color: var(--ink-soft); }
.shot li { margin-bottom: 8px; }

.split { display: grid; gap: 40px; grid-template-columns: 1.1fr 1fr; align-items: center; }
.split.reverse { grid-template-columns: 1fr 1.1fr; }
.split img { border: 1px solid var(--line); border-radius: var(--radius); }
.split p { color: var(--ink-soft); }
.perm { list-style: none; margin: 18px 0 10px; padding: 0; border: 1px solid var(--line); border-radius: 12px; overflow: hidden; }
.perm li { display: flex; justify-content: space-between; padding: 10px 14px; border-top: 1px solid var(--line); font-size: 14px; }
.perm li:first-child { border-top: 0; }
.perm em { font-style: normal; color: var(--ink-faint); }
.perm li.danger em { color: var(--danger); }

.local p { max-width: 40em; color: var(--ink-soft); }
.cards { display: grid; gap: 16px; grid-template-columns: repeat(3, 1fr); margin-top: 26px; }
.cards div { padding: 18px; border: 1px solid var(--line); border-radius: 12px; background: var(--bg-soft); }
.cards h4 { margin: 0 0 6px; font-size: 15px; }
.cards p { margin: 0; color: var(--ink-soft); font-size: 14px; }

.download { text-align: center; }
.download .cta { justify-content: center; }

footer {
  display: flex; justify-content: space-between; gap: 16px;
  max-width: var(--maxw); margin: 0 auto; padding: 28px 24px 56px;
  border-top: 1px solid var(--line); color: var(--ink-faint); font-size: 13px;
}

@media (max-width: 860px) {
  .three, .cards, .split, .split.reverse, .shot { grid-template-columns: 1fr; }
  section { padding: 44px 0; }
  .hero { padding: 56px 0 44px; }
}
.hero-note { display: flex; align-items: center; gap: 10px; margin-top: 22px; color: var(--ink-faint); font-size: 13px; }
.badge { display: inline-flex; align-items: center; height: 22px; padding: 0 8px; border: 1px solid var(--line); border-radius: 999px; font-size: 12px; color: var(--ink-soft); background: var(--bg-soft); }
.install .steps { margin: 22px 0 0; padding: 0; list-style: none; counter-reset: step; }
.install .steps li { position: relative; padding: 0 0 20px 44px; counter-increment: step; }
.install .steps li::before { content: counter(step); position: absolute; left: 0; top: 0; width: 28px; height: 28px; display: grid; place-items: center; border-radius: 50%; background: var(--ink); color: #fff; font-size: 13px; font-weight: 600; }
.install .steps b { display: block; font-size: 15px; }
.install .steps span { display: block; color: var(--ink-soft); font-size: 14px; margin-top: 2px; }
.install code { padding: 1px 5px; border-radius: 5px; background: var(--bg-soft); border: 1px solid var(--line); font-size: 13px; }
.faq details { border-top: 1px solid var(--line); padding: 14px 0; }
.faq details:first-of-type { border-top: 0; }
.faq summary { cursor: pointer; font-weight: 600; }
.faq p { margin: 8px 0 0; color: var(--ink-soft); }
.footer-links { display: inline-flex; gap: 16px; }
.footer-links a:hover { color: var(--ink); }
@media (max-width: 860px) { .footer { flex-direction: column; } }