:root {
  --bg: #0d1117;
  --bg-soft: #161b22;
  --card: #1c2230;
  --border: #2a3040;
  --fg: #e6edf3;
  --muted: #9aa7b4;
  --accent: #4f9cf9;
  --accent-2: #38d39f;
  --code: #0a0e14;
  --radius: 12px;
  --maxw: 1040px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--fg);
  background: var(--bg);
}
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3 { line-height: 1.2; }
code, pre { font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace; }

/* header */
.site-header { border-bottom: 1px solid var(--border); background: rgba(13,17,23,.85); position: sticky; top: 0; backdrop-filter: blur(8px); z-index: 10; }
.nav { display: flex; align-items: center; justify-content: space-between; height: 60px; }
.brand { font-weight: 700; font-size: 1.15rem; color: var(--fg); }
.brand:hover { text-decoration: none; }
.logo { color: var(--accent); }
.nav nav { display: flex; gap: 22px; align-items: center; }
.nav nav a { color: var(--muted); font-size: .95rem; }
.nav nav a.active, .nav nav a:hover { color: var(--fg); text-decoration: none; }

/* buttons */
.btn { display: inline-block; background: var(--accent); color: #06101f; font-weight: 600; padding: 12px 20px; border-radius: var(--radius); border: 0; }
.btn:hover { text-decoration: none; filter: brightness(1.08); }
.btn-sm { padding: 7px 14px; font-size: .9rem; }
.btn-ghost { background: transparent; color: var(--fg); border: 1px solid var(--border); }

/* hero */
.hero { text-align: center; padding: 88px 0 64px; }
.hero h1 { font-size: clamp(2.1rem, 5vw, 3.4rem); margin: 0 0 12px; }
.hero .tag { color: var(--accent-2); font-weight: 600; letter-spacing: .3px; }
.hero p.lead { color: var(--muted); font-size: 1.2rem; max-width: 720px; margin: 16px auto 28px; }
.hero .cta { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

/* sections */
section { padding: 56px 0; border-top: 1px solid var(--border); }
section h2 { font-size: 1.8rem; text-align: center; margin: 0 0 8px; }
section .sub { text-align: center; color: var(--muted); margin: 0 auto 36px; max-width: 640px; }

/* feature grid */
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 18px; }
.card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; }
.card h3 { margin: 0 0 8px; font-size: 1.1rem; }
.card p { margin: 0; color: var(--muted); font-size: .96rem; }

/* code block */
pre.code { background: var(--code); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px 20px; overflow-x: auto; color: #c9d6e4; }
pre.code .c { color: #6b7787; }
code.inline { background: var(--bg-soft); border: 1px solid var(--border); border-radius: 6px; padding: 1px 6px; font-size: .9em; }

/* download table */
table.dl { width: 100%; border-collapse: collapse; background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }
table.dl th, table.dl td { text-align: left; padding: 12px 14px; border-bottom: 1px solid var(--border); font-size: .95rem; }
table.dl th { color: var(--muted); font-weight: 600; }
table.dl tr:last-child td { border-bottom: 0; }
table.dl td.sha { color: var(--muted); font-family: ui-monospace, monospace; font-size: .78rem; word-break: break-all; }

.note { background: var(--bg-soft); border-left: 3px solid var(--accent); border-radius: 8px; padding: 14px 16px; color: var(--muted); }
.note strong { color: var(--fg); }

/* footer */
.site-footer { border-top: 1px solid var(--border); margin-top: 40px; color: var(--muted); }
.foot { display: flex; align-items: center; justify-content: space-between; padding: 24px 20px; flex-wrap: wrap; gap: 12px; font-size: .9rem; }
.foot nav { display: flex; gap: 18px; flex-wrap: wrap; }

.center { text-align: center; }
.mt { margin-top: 28px; }