:root {
  --ink: #1c1917;
  --muted: #57534e;
  --line: #e7e5e4;
  --paper: #f6f4f1;
  --white: #fff;
  --orange: #f15a12;
  --orange-deep: #d9480f;
  --green: #0f9f78;
  --shadow: 0 24px 60px rgba(28, 25, 23, 0.12);
  --radius: 22px;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(900px 420px at 90% -10%, #ffe1cf 0%, transparent 60%),
    radial-gradient(700px 380px at -10% 20%, #d9f6ec 0%, transparent 55%),
    var(--paper);
}
img { max-width: 100%; display: block; }
a { color: inherit; }

.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  gap: 28px;
  padding: 16px 7vw;
  background: rgba(246, 244, 241, 0.86);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid transparent;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  text-decoration: none;
  letter-spacing: 0.04em;
}
.mark {
  width: 28px;
  height: 28px;
  border-radius: 9px;
  background: linear-gradient(145deg, #ff8a3d, #ef4e12 55%, #12a37a);
}
.nav nav { display: flex; gap: 22px; margin-right: auto; }
.nav nav a { text-decoration: none; color: var(--muted); font-size: 15px; }
.nav nav a:hover { color: var(--ink); }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 18px;
  border-radius: 999px;
  background: var(--orange);
  color: white;
  text-decoration: none;
  font-weight: 650;
  box-shadow: 0 10px 24px rgba(241, 90, 18, 0.28);
}
.btn:hover { background: var(--orange-deep); }
.btn-sm { min-height: 38px; padding: 0 14px; font-size: 14px; box-shadow: none; }
.btn-ghost {
  background: transparent;
  color: var(--ink);
  box-shadow: inset 0 0 0 1px var(--line);
}

.hero, .block, .stats, .download, footer {
  width: min(1120px, calc(100% - 10vw));
  margin-inline: auto;
}
.hero {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 48px;
  align-items: center;
  padding: 56px 0 28px;
}
.eyebrow {
  margin: 0 0 12px;
  color: var(--orange-deep);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.12em;
}
h1, h2, h3 { font-weight: 720; letter-spacing: -0.03em; }
h1 { margin: 0; font-size: clamp(40px, 5vw, 68px); line-height: 1.08; }
h2 { margin: 0; font-size: clamp(28px, 3vw, 40px); line-height: 1.2; }
.lead, .section-head p, article p, .device-list span, .fine, footer p {
  color: var(--muted);
  line-height: 1.7;
}
.lead { font-size: 18px; max-width: 38rem; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin: 28px 0 18px; }
.pills { display: flex; flex-wrap: wrap; gap: 8px; padding: 0; margin: 0; list-style: none; }
.pills li {
  padding: 6px 12px;
  border-radius: 999px;
  background: white;
  color: var(--muted);
  font-size: 13px;
  box-shadow: inset 0 0 0 1px var(--line);
}

.phone {
  margin: 0;
  justify-self: center;
  width: min(280px, 100%);
  padding: 10px;
  border-radius: 36px;
  background: #1c1917;
  box-shadow: var(--shadow);
}
.phone img { border-radius: 28px; }
.phone-lg { width: min(300px, 100%); }

.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin: 18px auto 10px;
}
.stats div {
  background: white;
  border-radius: 18px;
  padding: 18px 16px;
  box-shadow: inset 0 0 0 1px var(--line);
}
.stats strong { display: block; font-size: 22px; }
.stats span { color: var(--muted); font-size: 14px; }

.block { padding: 72px 0 10px; }
.section-head { max-width: 640px; margin-bottom: 28px; }
.grid { display: grid; gap: 14px; }
.three { grid-template-columns: repeat(3, 1fr); }
.two { grid-template-columns: 1fr 1fr; }
article, .scene {
  background: white;
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: inset 0 0 0 1px var(--line);
}
article h3, .scene h3 { margin: 0 0 8px; font-size: 18px; }
article p, .scene p { margin: 0; }

.split, .scene-layout {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 40px;
  align-items: center;
}
.scene-layout { grid-template-columns: 1.2fr 0.8fr; }
.device-list { list-style: none; padding: 0; margin: 22px 0 0; display: grid; gap: 10px; }
.device-list li {
  display: grid;
  grid-template-columns: 9.5rem 1fr;
  gap: 12px;
  padding: 12px 0;
  border-top: 1px solid var(--line);
}
.device-list b { font-weight: 680; }

.steps ol {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  counter-reset: step;
}
.steps li {
  background: white;
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: inset 0 0 0 1px var(--line);
}
.steps li::before {
  counter-increment: step;
  content: counter(step);
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  margin-bottom: 14px;
  border-radius: 50%;
  background: #fff1e8;
  color: var(--orange-deep);
  font-weight: 700;
}
.steps strong, .steps span { display: block; }
.steps span { margin-top: 6px; color: var(--muted); line-height: 1.6; }

.download {
  margin: 72px auto;
  padding: 42px;
  border-radius: 32px;
  color: white;
  background: linear-gradient(120deg, #f07a22 0%, #e25b16 42%, #128a72 100%);
}
.download .eyebrow, .download p, .download .fine { color: rgba(255,255,255,0.88); }
.download .btn { background: white; color: var(--orange-deep); box-shadow: none; }
.download .fine { font-size: 13px; }

footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 10px 0 40px;
  border-top: 1px solid var(--line);
}
footer strong { letter-spacing: 0.06em; }
footer p { margin: 6px 0 0; }

@media (max-width: 860px) {
  .nav nav { display: none; }
  .hero, .split, .scene-layout, .three, .two, .stats, .steps ol, footer {
    grid-template-columns: 1fr;
    display: grid;
  }
  .hero { padding-top: 28px; }
  .phone { order: -1; }
  .scene-layout .phone { order: -1; }
  .device-list li { grid-template-columns: 1fr; gap: 2px; }
  .download { padding: 28px 20px; }
  footer { display: block; }
}