:root {
  --bg: #0b0e14;
  --bg-alt: #11151f;
  --card: #161b27;
  --text: #e6e9ef;
  --muted: #8b93a7;
  --accent: #4cc2ff;
  --accent-2: #38e0a8;
  --border: #232a3a;
  --radius: 12px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Segoe UI", system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
}

.container { max-width: 960px; margin: 0 auto; padding: 0 24px; }

/* ── Nav ── */
.nav {
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 20px 0;
}
.logo { font-weight: 700; font-size: 18px; letter-spacing: 0.3px; }
.logo .dot { color: var(--accent); }
.nav-link { color: var(--muted); text-decoration: none; font-size: 14px; transition: color 0.2s; }
.nav-link:hover { color: var(--text); }
.nav-link:first-of-type { margin-left: auto; }

/* ── Hero ── */
.hero {
  padding: 72px 0 80px;
  background:
    radial-gradient(600px 300px at 20% -10%, rgba(76,194,255,0.15), transparent),
    radial-gradient(500px 260px at 90% 10%, rgba(56,224,168,0.10), transparent),
    var(--bg);
}
.hero h1 { font-size: 40px; font-weight: 700; letter-spacing: 0.5px; margin-bottom: 16px; }
.sub { font-size: 17px; color: var(--muted); max-width: 560px; }

.cta-row { display: flex; gap: 14px; margin-top: 32px; flex-wrap: wrap; }
.btn {
  display: inline-block;
  padding: 12px 26px;
  border-radius: 10px;
  text-decoration: none;
  font-size: 15px;
  font-weight: 600;
  transition: transform 0.15s, box-shadow 0.15s;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary { background: var(--accent); color: #06222e; box-shadow: 0 6px 20px rgba(76,194,255,0.25); }
.btn-ghost { border: 1px solid var(--border); color: var(--text); }

/* ── Sections ── */
.section { padding: 64px 0; }
.section-alt { background: var(--bg-alt); }
.section h2 { font-size: 26px; margin-bottom: 24px; }
.muted { color: var(--muted); }
code { background: rgba(255,255,255,0.07); padding: 2px 7px; border-radius: 5px; font-size: 13px; }

/* ── Cards ── */
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; }
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
}
.card h3 { font-size: 16px; margin-bottom: 8px; color: var(--accent-2); }
.card p { font-size: 14px; color: var(--muted); }

/* ── Table ── */
table {
  width: 100%;
  border-collapse: collapse;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  font-size: 14px;
}
th, td { text-align: left; padding: 12px 16px; border-bottom: 1px solid var(--border); }
th { background: rgba(255,255,255,0.04); color: var(--muted); font-weight: 600; font-size: 13px; }
td { font-variant-numeric: tabular-nums; }
tr:last-child td { border-bottom: none; }

/* ── Footer ── */
.footer { padding: 32px 0; border-top: 1px solid var(--border); color: var(--muted); font-size: 13px; text-align: center; }

@media (max-width: 640px) {
  .hero h1 { font-size: 30px; }
  .nav-link { font-size: 13px; }
}