:root {
  --bg: #0f1220;
  --bg2: #171b2e;
  --card: #1c2138;
  --text: #eef0fa;
  --muted: #9aa1c0;
  --accent: #6c5ce7;
  --accent2: #a29bfe;
  --radius: 16px;
  --maxw: 860px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Hiragino Kaku Gothic ProN", "Yu Gothic UI", "Noto Sans JP", system-ui, sans-serif;
  background: linear-gradient(160deg, var(--bg), var(--bg2));
  color: var(--text);
  line-height: 1.75;
  min-height: 100vh;
}

a { color: var(--accent2); }

header.site {
  text-align: center;
  padding: 56px 20px 30px;
}
.logo {
  width: 84px; height: 84px; margin: 0 auto 16px;
  border-radius: 22px;
  background: radial-gradient(circle at 50% 42%, var(--accent) 0 34%, transparent 35%),
              linear-gradient(160deg, #0f1220, #362c74);
  border: 4px solid var(--accent2);
  display: grid; place-items: center;
}
h1 { font-size: 30px; margin: 0; letter-spacing: .5px; }
.tagline { color: var(--muted); margin-top: 6px; font-size: 14px; }

main {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 10px 22px 70px;
}

nav.top {
  display: flex; gap: 10px; justify-content: center; flex-wrap: wrap;
  margin-bottom: 26px;
}
nav.top a {
  text-decoration: none; color: var(--muted);
  border: 1px solid rgba(255,255,255,.14);
  padding: 8px 16px; border-radius: 20px; font-size: 13.5px;
}
nav.top a:hover { color: var(--text); border-color: var(--accent2); }

.card {
  background: var(--card);
  border: 1px solid rgba(255,255,255,.06);
  border-radius: var(--radius);
  padding: 26px 28px;
  margin-bottom: 20px;
}

.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 14px; }
.feature { background: rgba(108,92,231,.1); border-radius: 12px; padding: 16px; }
.feature b { display: block; margin-bottom: 4px; }
.feature span { color: var(--muted); font-size: 13.5px; }

h2 { font-size: 20px; margin: 8px 0 14px; border-left: 4px solid var(--accent); padding-left: 12px; }
h3 { font-size: 15px; margin: 22px 0 6px; color: var(--accent2); }
p, li { color: #d7daea; font-size: 14.5px; }
ul { padding-left: 20px; }
.lang-label { font-size: 12px; color: var(--muted); letter-spacing: 1px; text-transform: uppercase; }
.updated { color: var(--muted); font-size: 13px; }
hr { border: none; border-top: 1px solid rgba(255,255,255,.08); margin: 34px 0; }

footer {
  text-align: center; color: var(--muted); font-size: 12.5px;
  padding: 26px 20px 44px;
}
footer a { color: var(--muted); }