:root {
  --bg: #0b0d12;
  --card: rgba(255, 255, 255, 0.04);
  --border: rgba(255, 255, 255, 0.09);
  --text: #e9ebf2;
  --muted: #98a0b4;
  --accent: #7c5cff;
  --accent-2: #4f8cff;
}

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI Variable Display", "Segoe UI", Inter, system-ui, -apple-system, sans-serif;
  line-height: 1.65;
  font-size: 16px;
  background-image:
    radial-gradient(60rem 30rem at 10% -10%, rgba(124, 92, 255, 0.22), transparent 60%),
    radial-gradient(50rem 28rem at 95% 0%, rgba(79, 140, 255, 0.18), transparent 60%);
  background-repeat: no-repeat;
  min-height: 100vh;
}

a { color: #a99bff; text-decoration: none; }
a:hover { text-decoration: underline; }
code { font-family: Consolas, "Cascadia Code", monospace; font-size: 0.9em; background: rgba(255,255,255,0.07); padding: 1px 6px; border-radius: 6px; }

.nav {
  display: flex; align-items: center; justify-content: space-between; gap: 20px;
  max-width: 960px; margin: 0 auto; padding: 22px 24px;
}
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); font-size: 18px; }
.brand:hover { text-decoration: none; }
.mark {
  width: 28px; height: 28px; border-radius: 9px; display: inline-block;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  position: relative;
}
.mark::after {
  content: ""; position: absolute; left: 10px; top: 7px;
  border-left: 9px solid #fff; border-top: 7px solid transparent; border-bottom: 7px solid transparent;
}
.nav nav { display: flex; gap: 18px; font-size: 14.5px; }
.nav nav a { color: var(--muted); }

main { max-width: 960px; margin: 0 auto; padding: 20px 24px 60px; }

.hero { padding: 40px 0 26px; max-width: 720px; }
.hero h1 { font-size: clamp(30px, 5vw, 46px); line-height: 1.12; letter-spacing: -0.025em; margin-bottom: 18px; }
.lead { font-size: 18px; color: #c9cee0; }
.note { margin-top: 14px; color: var(--muted); font-size: 14.5px; }

.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 16px; margin-top: 34px; }
.grid article { background: var(--card); border: 1px solid var(--border); border-radius: 16px; padding: 20px 22px; }
.grid h2 { font-size: 16px; margin-bottom: 8px; letter-spacing: -0.01em; }
.grid p { color: var(--muted); font-size: 14.5px; }

.how { margin-top: 40px; background: var(--card); border: 1px solid var(--border); border-radius: 16px; padding: 24px 26px; }
.how h2 { font-size: 18px; margin-bottom: 12px; }
.how ol { padding-left: 20px; color: var(--muted); display: grid; gap: 8px; font-size: 15px; }

.doc { max-width: 760px; }
.doc h1 { font-size: 32px; letter-spacing: -0.02em; margin: 26px 0 6px; }
.doc .updated { color: var(--muted); font-size: 14px; margin-bottom: 26px; }
.doc h2 { font-size: 17px; margin: 26px 0 8px; letter-spacing: -0.01em; }
.doc p, .doc li { color: #c3c9db; font-size: 15.5px; }
.doc ul { padding-left: 22px; display: grid; gap: 7px; margin: 10px 0; }

footer {
  border-top: 1px solid var(--border); margin-top: 30px;
  padding: 24px; text-align: center; color: var(--muted); font-size: 13.5px;
}
footer p + p { margin-top: 6px; }

@media (prefers-color-scheme: light) {
  :root { --bg: #f6f7fb; --card: #fff; --border: rgba(16,20,32,0.1); --text: #161a24; --muted: #5d6478; }
  body { background-image: radial-gradient(60rem 30rem at 10% -10%, rgba(124,92,255,0.12), transparent 60%), radial-gradient(50rem 28rem at 95% 0%, rgba(79,140,255,0.1), transparent 60%); }
  a { color: #5b46d6; }
  .lead, .doc p, .doc li { color: #3b4357; }
}