:root {
  --bg: #f6f8fb;
  --surface: #ffffff;
  --text: #1a2333;
  --muted: #5b6b82;
  --accent: #2563eb;
  --accent-soft: #e6efff;
  --border: #dbe3ee;
  --code-bg: #0f172a;
  --code-text: #d7e3f4;
  --green: #16a34a;
  --header: #ffffff;
  --header-border: #e5eaf2;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1220;
    --surface: #111a2c;
    --text: #e6edf7;
    --muted: #93a5bd;
    --accent: #60a5fa;
    --accent-soft: #1c2b4a;
    --border: #243247;
    --code-bg: #0b1220;
    --code-text: #d7e3f4;
    --green: #4ade80;
    --header: #0e1728;
    --header-border: #1d2a42;
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 32px;
  background: var(--header);
  border-bottom: 1px solid var(--header-border);
}

.brand { font-weight: 800; font-size: 18px; color: var(--text); }
.brand span { color: var(--accent); }

.links { display: flex; gap: 20px; font-size: 14px; }
.links a { color: var(--muted); }
.links a:hover { color: var(--accent); text-decoration: none; }

.hero {
  padding: 72px 32px 56px;
  text-align: center;
}

.hero h1 {
  margin: 0 0 12px;
  font-size: 46px;
  letter-spacing: -1px;
}

.hero p {
  margin: 0 auto 22px;
  max-width: 680px;
  color: var(--muted);
  font-size: 17px;
}

.badges {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  margin-bottom: 28px;
}

.badges img { height: 22px; }

.cta { display: flex; justify-content: center; gap: 12px; flex-wrap: wrap; }

.btn {
  display: inline-block;
  padding: 10px 22px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
}

.btn.primary { background: var(--accent); color: #fff; }
.btn.primary:hover { text-decoration: none; filter: brightness(1.08); }
.btn.ghost { border: 1px solid var(--border); color: var(--text); }

.container { max-width: 1080px; margin: 0 auto; padding: 0 32px 56px; }

.section-title { font-size: 26px; margin: 48px 0 18px; }

.features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.feat {
  padding: 20px;
  border-radius: 12px;
  background: var(--surface);
  border: 1px solid var(--border);
}

.feat b { display: block; margin-bottom: 6px; font-size: 15px; }
.feat span { color: var(--muted); font-size: 13px; }

.arch {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 26px;
  border-radius: 14px;
  background: var(--surface);
  border: 1px solid var(--border);
}

.arch-row { display: flex; justify-content: center; gap: 12px; flex-wrap: wrap; }

.node {
  padding: 8px 16px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg);
  font-size: 13px;
}

.node.hot { border-color: var(--accent); color: var(--accent); font-weight: 600; }
.arrow { text-align: center; color: var(--muted); font-size: 15px; }

.code {
  margin: 0;
  padding: 16px 20px;
  border-radius: 10px;
  background: var(--code-bg);
  color: var(--code-text);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 13px;
  overflow-x: auto;
}

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }

.panel {
  padding: 18px 20px;
  border-radius: 12px;
  background: var(--surface);
  border: 1px solid var(--border);
}

.panel h3 { margin: 0 0 8px; font-size: 16px; }
.panel p { margin: 0; color: var(--muted); font-size: 13px; }

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  background: var(--surface);
  border-radius: 10px;
  overflow: hidden;
  border: 1px solid var(--border);
}

th, td { padding: 10px 14px; text-align: left; border-bottom: 1px solid var(--border); }
th { background: var(--accent-soft); }

.footer {
  padding: 24px 32px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 13px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}

@media (max-width: 760px) {
  .nav { padding: 12px 16px; }
  .links { gap: 12px; font-size: 13px; }
  .hero { padding: 48px 16px 40px; }
  .hero h1 { font-size: 34px; }
  .container { padding: 0 16px 40px; }
  .features, .grid-2 { grid-template-columns: 1fr; }
}