:root {
  --bg: #0b0e14;
  --bg2: #0f131c;
  --panel: #151a23;
  --panel2: #1b212c;
  --line: #232b38;
  --text: #e6ebf2;
  --muted: #93a0b4;
  --dim: #6b7688;
  --brand: #5b8cff;
  --brand2: #7c5cff;
  --busy: #f5a623;
  --idle: #38d39f;
  --warn: #f0674a;
  --radius: 14px;
  --maxw: 1060px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background:
    radial-gradient(1100px 520px at 78% -8%, rgba(91,140,255,.16), transparent 60%),
    radial-gradient(900px 500px at 8% 4%, rgba(124,92,255,.12), transparent 55%),
    var(--bg);
  color: var(--text);
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  -webkit-font-smoothing: antialiased;
}
.mono { font-family: "SF Mono", ui-monospace, Menlo, Consolas, monospace; }
a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }

/* language toggle */
body.lang-en .zh { display: none; }
body.lang-zh .en { display: none; }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 22px; }

/* nav */
nav {
  position: sticky; top: 0; z-index: 20;
  backdrop-filter: blur(10px);
  background: rgba(11,14,20,.72);
  border-bottom: 1px solid var(--line);
}
nav .wrap { display: flex; align-items: center; gap: 18px; height: 60px; }
.logo { font-weight: 800; font-size: 18px; letter-spacing: -.2px; }
.logo .dot { color: var(--brand); }
nav .links { display: flex; gap: 20px; margin-left: auto; }
nav .links a { color: var(--muted); font-size: 14px; }
nav .links a:hover { color: var(--text); text-decoration: none; }
.langbtn {
  border: 1px solid var(--line); background: var(--panel); color: var(--text);
  border-radius: 8px; padding: 6px 12px; font: inherit; font-size: 13px; cursor: pointer;
}
.langbtn:hover { border-color: var(--brand); }
@media (max-width: 720px) { nav .links { display: none; } }

/* hero */
.hero { padding: 84px 0 56px; text-align: center; }
.badge {
  display: inline-block; font-size: 12px; letter-spacing: .5px; text-transform: uppercase;
  color: var(--brand); border: 1px solid rgba(91,140,255,.35); border-radius: 30px;
  padding: 5px 14px; margin-bottom: 22px; background: rgba(91,140,255,.08);
}
.hero h1 { font-size: clamp(32px, 6vw, 54px); line-height: 1.08; margin: 0 0 18px; letter-spacing: -1px; }
.hero h1 .grad { background: linear-gradient(100deg, var(--brand), var(--brand2)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero p.lead { font-size: clamp(16px, 2.3vw, 20px); color: var(--muted); max-width: 720px; margin: 0 auto 30px; }
.cta { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.btn { display: inline-flex; align-items: center; gap: 8px; border-radius: 10px; padding: 12px 22px; font-weight: 600; font-size: 15px; cursor: pointer; border: 1px solid transparent; }
.btn--primary { background: linear-gradient(100deg, var(--brand), var(--brand2)); color: #fff; }
.btn--primary:hover { filter: brightness(1.08); text-decoration: none; }
.btn--ghost { background: var(--panel); border-color: var(--line); color: var(--text); }
.btn--ghost:hover { border-color: var(--brand); text-decoration: none; }
.install { margin-top: 26px; display: inline-flex; align-items: center; gap: 10px; background: var(--panel); border: 1px solid var(--line); border-radius: 10px; padding: 10px 16px; }
.install code { color: var(--idle); }
.copy { border: none; background: transparent; color: var(--dim); cursor: pointer; font-size: 13px; }
.copy:hover { color: var(--text); }

/* sections */
section { padding: 54px 0; border-top: 1px solid var(--line); }
.eyebrow { color: var(--brand); font-size: 13px; text-transform: uppercase; letter-spacing: 1px; font-weight: 600; }
h2 { font-size: clamp(24px, 4vw, 34px); margin: 8px 0 8px; letter-spacing: -.5px; }
.sub { color: var(--muted); max-width: 760px; margin: 0 0 30px; }

/* pillars */
.grid { display: grid; gap: 18px; grid-template-columns: repeat(3, 1fr); }
@media (max-width: 820px) { .grid { grid-template-columns: 1fr; } }
.card { background: linear-gradient(180deg, var(--panel), var(--bg2)); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; }
.card .ico { font-size: 24px; margin-bottom: 10px; }
.card h3 { margin: 0 0 8px; font-size: 18px; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }
.card .tag { display: inline-block; margin-top: 12px; font-size: 12px; color: var(--idle); border: 1px solid rgba(56,211,159,.3); border-radius: 20px; padding: 2px 10px; }

/* diagram */
.diagram { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; overflow-x: auto; }
.diagram pre { margin: 0; font-size: 13px; line-height: 1.5; color: var(--muted); }
.diagram pre b { color: var(--brand); font-weight: 600; }
.diagram pre .r { color: var(--idle); }
.diagram pre .w { color: var(--busy); }

/* flow */
.flow { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-top: 8px; }
@media (max-width: 820px) { .flow { grid-template-columns: 1fr 1fr; } }
.step { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 18px; position: relative; }
.step .n { position: absolute; top: -12px; left: 16px; width: 26px; height: 26px; border-radius: 50%; background: linear-gradient(100deg, var(--brand), var(--brand2)); color: #fff; display: grid; place-items: center; font-size: 13px; font-weight: 700; }
.step h4 { margin: 8px 0 6px; font-size: 15px; }
.step p { margin: 0; color: var(--muted); font-size: 13px; }
.step code { color: var(--idle); font-size: 12px; }

/* code block */
pre.code { background: #0a0d13; border: 1px solid var(--line); border-radius: 12px; padding: 18px 20px; overflow-x: auto; font-family: "SF Mono", ui-monospace, Menlo, monospace; font-size: 13.5px; line-height: 1.7; color: #cdd6e4; }
pre.code .c { color: var(--dim); }
pre.code .k { color: var(--brand); }

/* table */
.tbl { width: 100%; border-collapse: collapse; font-size: 14px; }
.tbl th, .tbl td { text-align: left; padding: 11px 14px; border-bottom: 1px solid var(--line); vertical-align: top; }
.tbl th { color: var(--muted); font-weight: 600; }
.tbl td code { color: var(--idle); }
.tbl tr:hover td { background: var(--panel); }

/* callout */
.note { background: rgba(91,140,255,.07); border: 1px solid rgba(91,140,255,.3); border-radius: 12px; padding: 14px 18px; color: var(--muted); font-size: 14px; margin-top: 22px; }

/* platform chips */
.chips { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 4px; }
.chip { background: var(--panel); border: 1px solid var(--line); border-radius: 24px; padding: 8px 16px; font-size: 14px; color: var(--text); }
.chip:hover { border-color: var(--brand); color: var(--brand); }

footer { border-top: 1px solid var(--line); padding: 34px 0; color: var(--dim); font-size: 14px; text-align: center; }
footer a { color: var(--muted); }