:root {
  --bg: #0b1220;
  --bg-soft: #121a2b;
  --text: #e8eef8;
  --muted: #93a4bd;
  --accent: #2dd4bf;
  --accent-2: #38bdf8;
  --line: rgba(148, 163, 184, 0.25);
  --max: 1080px;
  --font-display: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }
html, body {
  margin: 0;
  padding: 0;
  color: var(--text);
  background:
    radial-gradient(1200px 600px at 10% -10%, rgba(45, 212, 191, 0.18), transparent 60%),
    radial-gradient(900px 500px at 90% 0%, rgba(56, 189, 248, 0.16), transparent 55%),
    linear-gradient(180deg, #0b1220 0%, #0f172a 100%);
  font-family: var(--font-display);
  min-height: 100%;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

.wrap { width: min(100% - 2rem, var(--max)); margin-inline: auto; }

.site-header {
  position: sticky; top: 0; z-index: 20;
  backdrop-filter: blur(10px);
  background: rgba(11, 18, 32, 0.75);
  border-bottom: 1px solid var(--line);
}
.nav {
  display: flex; align-items: center; justify-content: space-between;
  min-height: 64px; gap: 1rem;
}
.logo {
  font-weight: 800; letter-spacing: 0.04em; font-size: 1.1rem;
}
.logo span { color: var(--accent); }
.nav-links { display: flex; gap: 1.25rem; flex-wrap: wrap; }
.nav-links a { color: var(--muted); font-size: 0.95rem; }
.nav-links a:hover, .nav-links a.active { color: var(--text); }

.hero {
  padding: 5.5rem 0 4rem;
  min-height: calc(100vh - 64px);
  display: grid;
  align-content: center;
  gap: 1.25rem;
}
.hero .brand {
  font-size: clamp(2.6rem, 7vw, 4.4rem);
  line-height: 1.05;
  font-weight: 800;
  letter-spacing: -0.02em;
}
.hero .brand em {
  font-style: normal;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero p {
  max-width: 36rem;
  color: var(--muted);
  font-size: 1.05rem;
  line-height: 1.7;
  margin: 0;
}
.cta-row { display: flex; gap: 0.75rem; flex-wrap: wrap; margin-top: 0.5rem; }
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 0.7rem 1.15rem; border-radius: 999px;
  border: 1px solid transparent; font-weight: 600;
}
.btn-primary {
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  color: #062018;
}
.btn-ghost {
  border-color: var(--line);
  color: var(--text);
}

.section { padding: 3.5rem 0; border-top: 1px solid var(--line); }
.section h2 {
  margin: 0 0 0.5rem;
  font-size: clamp(1.6rem, 3vw, 2rem);
}
.section .lead { color: var(--muted); margin: 0 0 1.75rem; max-width: 40rem; line-height: 1.7; }

.product-list { display: grid; gap: 1rem; }
.product-item {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 1rem;
  align-items: center;
  padding: 1.25rem 1.35rem;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: rgba(18, 26, 43, 0.7);
  transition: border-color .2s, transform .2s;
}
.product-item:hover { border-color: rgba(45, 212, 191, 0.5); transform: translateY(-2px); }
.product-item h3 { margin: 0 0 0.35rem; font-size: 1.2rem; }
.product-item p { margin: 0; color: var(--muted); line-height: 1.6; }

.prose { max-width: 42rem; line-height: 1.8; color: var(--muted); }
.prose h1 { color: var(--text); margin-top: 0; }
.prose strong { color: var(--text); }

.site-footer {
  border-top: 1px solid var(--line);
  padding: 1.5rem 0 2.5rem;
  color: var(--muted);
  font-size: 0.9rem;
}

@media (max-width: 720px) {
  .product-item { grid-template-columns: 1fr; }
  .nav-links { gap: 0.8rem; font-size: 0.9rem; }
}