:root {
  --bg: #070b14;
  --bg2: #0c1322;
  --ink: #e8eefc;
  --muted: #8fa3c7;
  --accent: #22d3ee;
  --accent2: #7c5cff;
  --line: rgba(120, 160, 220, 0.16);
  --card: rgba(16, 24, 42, 0.72);
  --font: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}
* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  font-family: var(--font);
  color: var(--ink);
  background: linear-gradient(180deg, var(--bg), var(--bg2) 40%, #0a1020);
  line-height: 1.6;
}
.bg-grid {
  position: fixed; inset: 0; pointer-events: none; opacity: 0.25;
  background-image:
    linear-gradient(rgba(34,211,238,0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(34,211,238,0.06) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(circle at 50% 0%, #000 20%, transparent 75%);
}
code {
  font-family: ui-monospace, Consolas, monospace;
  background: rgba(255,255,255,0.06);
  padding: 2px 6px; border-radius: 6px; font-size: 0.92em;
}
.nav {
  position: sticky; top: 0; z-index: 20;
  display: flex; align-items: center; gap: 24px;
  padding: 14px 28px;
  backdrop-filter: blur(14px);
  background: rgba(7,11,20,0.7);
  border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 10px; min-width: 180px; }
.logo {
  width: 28px; height: 28px; border-radius: 50%;
  background: conic-gradient(from 180deg, var(--accent), var(--accent2), var(--accent));
  box-shadow: 0 0 18px rgba(34,211,238,0.45);
}
.brand strong { display: block; font-size: 15px; }
.ver { color: var(--muted); font-size: 12px; }
.nav nav { display: flex; gap: 18px; flex: 1; }
.nav a { color: var(--muted); text-decoration: none; font-size: 14px; }
.nav a:hover { color: var(--ink); }

.btn {
  display: inline-flex; align-items: center; justify-content: center;
  border-radius: 12px; padding: 12px 18px; font-weight: 700; text-decoration: none;
  border: 1px solid var(--line); color: var(--ink); cursor: pointer; font-size: 14px;
}
.btn.primary {
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  border: none; color: #041018;
  box-shadow: 0 10px 30px rgba(34,211,238,0.25);
}
.btn.ghost { background: rgba(255,255,255,0.04); }
.btn.sm { padding: 8px 14px; font-size: 13px; border-radius: 10px; }
.btn.lg { padding: 14px 22px; font-size: 15px; }

.hero {
  max-width: 1120px; margin: 0 auto; padding: 72px 28px 40px;
  display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 40px; align-items: center;
}
.eyebrow {
  display: inline-block; font-size: 12px; letter-spacing: 0.08em;
  color: var(--accent); border: 1px solid rgba(34,211,238,0.3);
  padding: 4px 10px; border-radius: 999px; margin-bottom: 14px;
  background: rgba(34,211,238,0.08);
}
.hero h1 {
  font-size: clamp(34px, 5vw, 56px);
  line-height: 1.12; margin: 0 0 16px; letter-spacing: -0.02em;
}
.grad {
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.lead { color: var(--muted); font-size: 16px; max-width: 34em; }
.cta-row { display: flex; gap: 12px; margin: 24px 0 14px; flex-wrap: wrap; }
.meta-row { display: flex; gap: 14px; flex-wrap: wrap; color: var(--muted); font-size: 13px; }
.meta-row span::before { content: "• "; color: var(--accent); }

.hero-visual { position: relative; min-height: 360px; display: grid; place-items: center; }
.orb-stage { position: relative; width: 260px; height: 260px; display: grid; place-items: center; }
.orb {
  width: 96px; height: 96px; border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, #a5f3fc, var(--accent) 45%, var(--accent2));
  box-shadow: 0 0 60px rgba(34,211,238,0.5);
  animation: breathe 2.4s ease-in-out infinite;
}
.ring {
  position: absolute; inset: 40px; border-radius: 50%;
  border: 1px solid rgba(34,211,238,0.35);
  animation: pulse 2.8s ease-out infinite;
}
.ring.r2 { animation-delay: 0.5s; inset: 20px; }
.ring.r3 { animation-delay: 1s; inset: 0; }
.wave {
  position: absolute; bottom: -10px; display: flex; gap: 5px; align-items: flex-end; height: 48px;
}
.wave i {
  width: 5px; border-radius: 99px; background: linear-gradient(180deg, var(--accent), var(--accent2));
  animation: bar 1s ease-in-out infinite;
}
.wave i:nth-child(odd) { animation-delay: 0.15s; height: 18px; }
.wave i:nth-child(even) { animation-delay: 0.3s; height: 28px; }
.wave i:nth-child(3n) { animation-delay: 0.45s; height: 36px; }

.float-card {
  position: absolute;
  padding: 10px 12px; border-radius: 12px;
  background: var(--card); border: 1px solid var(--line);
  font-size: 13px; box-shadow: 0 12px 30px rgba(0,0,0,0.35);
  backdrop-filter: blur(10px);
}
.f1 { top: 30px; left: 10px; animation: floaty 3s ease-in-out infinite; }
.f2 { top: 120px; right: 0; animation: floaty 3.5s ease-in-out infinite 0.4s; }
.f3 { bottom: 40px; left: 30px; animation: floaty 3.2s ease-in-out infinite 0.8s; }

.stats {
  max-width: 1120px; margin: 0 auto; padding: 10px 28px 30px;
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px;
}
.stats div {
  background: var(--card); border: 1px solid var(--line); border-radius: 16px;
  padding: 18px; text-align: center;
}
.stats b { display: block; font-size: 28px; }
.stats span { color: var(--muted); font-size: 13px; }

.section { max-width: 1120px; margin: 0 auto; padding: 48px 28px; }
.section h2 { font-size: 28px; margin: 0 0 8px; }
.section-sub { color: var(--muted); margin: 0 0 22px; }
.cards {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px;
}
.cards article {
  background: var(--card); border: 1px solid var(--line); border-radius: 18px;
  padding: 18px 18px 16px;
}
.cards h3 { margin: 0 0 8px; font-size: 16px; }
.cards p { margin: 0; color: var(--muted); font-size: 14px; }

.split { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; align-items: center; }
.steps { padding-left: 18px; color: var(--muted); }
.steps b { color: var(--ink); }
.panel-demo {
  background: var(--card); border: 1px solid var(--line); border-radius: 18px;
  padding: 22px; min-height: 220px;
}
.demo-line {
  padding: 12px 14px; border-radius: 14px; margin-bottom: 12px; max-width: 90%;
  border: 1px solid var(--line); background: rgba(255,255,255,0.03); font-size: 14px;
}
.demo-line.user { margin-left: auto; border-color: rgba(34,211,238,0.3); background: rgba(34,211,238,0.1); }
.demo-line.bot { width: 70%; }
.demo-line.typing { display: flex; gap: 6px; align-items: center; height: 44px; }
.demo-line.typing span {
  width: 8px; height: 8px; border-radius: 50%; background: var(--accent);
  animation: blink 1s infinite;
}
.demo-line.typing span:nth-child(2) { animation-delay: 0.15s; }
.demo-line.typing span:nth-child(3) { animation-delay: 0.3s; }
.demo-stages { display: flex; gap: 8px; flex-wrap: wrap; }
.demo-stages em {
  font-style: normal; font-size: 12px; color: var(--muted);
  border: 1px solid var(--line); border-radius: 999px; padding: 4px 8px; opacity: 0.5;
}
.demo-stages em.on { opacity: 1; color: var(--ink); border-color: rgba(34,211,238,0.4); }
.demo-stages em.done { opacity: 1; color: #34d399; border-color: rgba(52,211,153,0.35); }

.model-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.model {
  background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 14px;
}
.model b { display: block; font-size: 14px; margin-bottom: 4px; }
.model span { color: var(--muted); font-size: 13px; }

.download-box { text-align: center; }
.dl-card {
  display: flex; justify-content: space-between; align-items: center; gap: 18px;
  background: var(--card); border: 1px solid var(--line); border-radius: 20px;
  padding: 22px; margin: 0 auto 18px; max-width: 720px; text-align: left;
}
.dl-main { display: flex; gap: 14px; align-items: center; }
.dl-icon {
  width: 56px; height: 56px; border-radius: 14px; display: grid; place-items: center;
  background: linear-gradient(135deg, rgba(34,211,238,0.2), rgba(124,92,255,0.2));
  border: 1px solid var(--line); font-size: 11px; font-weight: 800; letter-spacing: 0.04em;
}
.dl-card h3 { margin: 0; }
.dl-card p { margin: 4px 0 0; color: var(--muted); font-size: 13px; }
.req {
  color: var(--muted); font-size: 14px; text-align: left; max-width: 720px; margin: 0 auto;
}

.ota-flow {
  display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin-bottom: 12px;
}
.ota-flow div {
  background: var(--card); border: 1px solid var(--line); border-radius: 12px;
  padding: 10px 14px; font-size: 14px;
}
.ota-flow span { color: var(--accent); }

.footer {
  max-width: 1120px; margin: 0 auto; padding: 28px; color: var(--muted);
  display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap;
  border-top: 1px solid var(--line); font-size: 13px;
}

@keyframes breathe { 0%,100%{transform:scale(1)} 50%{transform:scale(1.08)} }
@keyframes pulse { 0%{transform:scale(0.85);opacity:.8} 100%{transform:scale(1.2);opacity:0} }
@keyframes blink { 50% { opacity: 0.25; } }
@keyframes bar { 0%,100%{transform:scaleY(0.6)} 50%{transform:scaleY(1.2)} }
@keyframes floaty { 0%,100%{transform:translateY(0)} 50%{transform:translateY(-8px)} }

@media (max-width: 960px) {
  .hero, .split, .cards, .model-grid, .stats { grid-template-columns: 1fr; }
  .nav nav { display: none; }
  .hero-visual { min-height: 280px; }
}