:root {
  --navy: #060d1a;
  --panel: #0e1830;
  --ink: #eaf2ff;
  --muted: #8aa0bd;
  --cyan: #4dd2f2;
  --green: #5fcf7e;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: radial-gradient(1200px 600px at 70% -10%, #12305a 0%, transparent 60%), var(--navy);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
.wrap { max-width: 760px; margin: 0 auto; padding: 48px 22px 80px; }
.brand {
  display: inline-flex; align-items: center; gap: 10px;
  font-weight: 800; letter-spacing: 1px; text-decoration: none; color: var(--ink);
}
.brand .a { color: #fff; }
.brand .b { background: linear-gradient(90deg, var(--cyan), var(--green));
  -webkit-background-clip: text; background-clip: text; color: transparent; }
.kicker { color: var(--cyan); letter-spacing: 3px; font-size: 12px; font-weight: 800; text-transform: uppercase; }
h1 { font-size: 34px; font-weight: 800; margin: 10px 0 4px; }
h2 { font-size: 20px; font-weight: 800; margin: 34px 0 8px; color: #fff; }
h3 { font-size: 16px; font-weight: 700; margin: 22px 0 4px; color: var(--cyan); }
p, li { color: var(--ink); }
.muted { color: var(--muted); font-size: 14px; }
a { color: var(--cyan); text-decoration: none; }
a:hover { text-decoration: underline; }
hr { border: none; border-top: 1px solid rgba(255,255,255,0.08); margin: 28px 0; }
.card {
  background: var(--panel); border: 1px solid rgba(255,255,255,0.08);
  border-radius: 18px; padding: 22px 26px; margin-top: 18px;
}
.links { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 24px; }
.btn {
  display: inline-block; padding: 12px 20px; border-radius: 14px; font-weight: 700;
  background: linear-gradient(180deg, #fff, #dfe6ee); color: #11203a;
}
.btn.ghost { background: transparent; color: var(--ink); border: 1px solid rgba(255,255,255,0.2); }
.toc a { display: inline-block; margin-right: 14px; font-size: 14px; }
footer { margin-top: 50px; color: var(--muted); font-size: 13px; }