:root{
  --bg:#0b1220; --bg2:#0f1726; --card:#131d30; --card2:#16233a;
  --line:#22314b; --fg:#dbe6f5; --mut:#8ea3c0; --mut2:#6f83a0;
  --acc:#4a9df0; --acc2:#7fd0ff; --ok:#39c07a; --warn:#e0a94a;
  --radius:16px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;background:linear-gradient(180deg,#0b1220,#0e1830 40%,#0b1220) fixed;color:var(--fg);
  font-family:-apple-system,BlinkMacSystemFont,"Noto Sans CJK SC","PingFang SC","Microsoft YaHei",sans-serif;
  line-height:1.7;-webkit-font-smoothing:antialiased;
}
.wrap{max-width:1080px;margin:0 auto;padding:0 20px}
a{color:var(--acc);text-decoration:none}
a:hover{color:var(--acc2)}
h1,h2,h3,h4{line-height:1.25;color:#fff}
img{max-width:100%}
code{background:#0a1322;border:1px solid var(--line);border-radius:6px;padding:2px 6px;font-size:13px;
  font-family:ui-monospace,Menlo,Consolas,monospace;color:#bfe0ff;word-break:break-all}

/* ---------- nav ---------- */
.nav{position:sticky;top:0;z-index:50;background:rgba(11,18,32,.82);backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line)}
.nav .wrap{display:flex;align-items:center;height:60px;gap:12px}
.brand{display:flex;align-items:center;gap:9px;font-weight:800;letter-spacing:.3px;color:#fff;font-size:17px;white-space:nowrap}
.brand .dot{width:22px;height:22px;border-radius:6px;background:linear-gradient(135deg,var(--acc),var(--acc2));
  display:inline-flex;align-items:center;justify-content:center;font-size:13px;color:#08111f;font-weight:900}
.brand b{color:var(--acc2)}
.nav nav{display:flex;align-items:center;gap:2px;flex-wrap:wrap;margin-left:auto;order:3}
.nav nav a{margin-left:14px;color:var(--mut);font-size:14px;padding:4px 2px;border-bottom:2px solid transparent}
.nav nav a:hover,.nav nav a.on{color:#fff;border-bottom-color:var(--acc)}
.brand{order:1}
.nav-slogan{order:2;font-size:13px;font-weight:800;letter-spacing:.22em;color:var(--acc2);white-space:nowrap;
  pointer-events:none;padding-left:14px;margin-left:4px;border-left:1px solid var(--line)}
@media(max-width:860px){.nav-slogan{display:none}}
.gh{margin-left:14px;color:var(--mut);font-size:13px;border:1px solid var(--line);border-radius:8px;padding:4px 10px}
.gh:hover{border-color:var(--acc);color:#fff}
.lang{margin-left:14px;color:var(--mut);font-size:13px;border:1px solid var(--line);border-radius:8px;padding:4px 10px;font-weight:600}
.lang:hover{border-color:var(--acc);color:#fff}
.lang b{color:var(--acc2)}

/* ---------- hero ---------- */
.hero{text-align:center;padding:72px 0 46px;position:relative;overflow:hidden}
.hero:before{content:"";position:absolute;inset:0;background:
  radial-gradient(600px 260px at 50% -40px,rgba(74,157,240,.20),transparent 70%);pointer-events:none}
.hero h1{font-size:clamp(28px,5vw,46px);margin:0 0 16px;letter-spacing:-.5px}
.hero .hl{background:linear-gradient(90deg,var(--acc),var(--acc2));-webkit-background-clip:text;background-clip:text;color:transparent}
.hero .sub{color:var(--mut);font-size:clamp(15px,2.2vw,18px);margin:0 auto 28px;max-width:660px}
.slogan{display:inline-block;margin:2px 0 20px;font-size:clamp(16px,2.7vw,23px);font-weight:800;letter-spacing:.3em;text-indent:.3em;
  color:var(--acc2);text-shadow:0 0 26px rgba(127,208,255,.35)}
.slogan:before{content:"「";color:var(--mut2);margin-right:.06em}
.slogan:after{content:"」";color:var(--mut2);margin-left:.06em}
.hero .meta{color:var(--mut2);font-size:13px;margin-top:20px}
.hero .cta{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}

.btn{display:inline-block;background:linear-gradient(180deg,#3a90ea,#2f6fd0);color:#fff;font-weight:700;
  padding:11px 20px;border-radius:11px;box-shadow:0 6px 18px rgba(47,111,208,.35);border:0;cursor:pointer;font-size:15px}
.btn:hover{filter:brightness(1.08);color:#fff}
.btn.ghost{background:transparent;border:1px solid var(--line);box-shadow:none;color:var(--fg);font-weight:600}
.btn.ghost:hover{border-color:var(--acc);color:#fff}

/* ---------- section ---------- */
section{padding:38px 0}
.sec-head{display:flex;align-items:baseline;justify-content:space-between;gap:12px;margin:0 0 20px;flex-wrap:wrap}
h2{font-size:24px;margin:0;padding-left:12px;border-left:5px solid var(--acc)}
h2 .n{color:var(--mut2);font-size:15px;font-weight:500;margin-left:8px}
.sec-head .more{font-size:14px;color:var(--mut)}
.lead{color:var(--mut);font-size:15px;margin:0 0 22px}

/* ---------- cards ---------- */
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.cards.two{grid-template-columns:repeat(2,1fr)}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:20px;
  display:flex;flex-direction:column;transition:.15s;position:relative}
.card:hover{border-color:#345a8f;transform:translateY(-2px)}
.card .ic{font-size:34px;line-height:1}
.card h3{margin:8px 0 8px;font-size:19px}
.card p{color:#c4d3e8;font-size:14px;margin:0 0 12px}
.tags{list-style:none;display:flex;gap:8px;padding:0;margin:0 0 14px;flex-wrap:wrap}
.tags li{font-size:12px;color:#9fd0ff;background:#132844;border:1px solid #24456f;border-radius:999px;padding:2px 10px}
.tags li.ok{color:#8ff0b8;background:#122f22;border-color:#1f5d3e}
.tags li.warn{color:#f0d79a;background:#2f2812;border-color:#5d4d1f}
.dl{margin-top:auto}
.dl .btn{width:100%;text-align:center;padding:11px 10px;font-size:14px}
.dl .btn+.btn{margin-top:8px}
.badge{position:absolute;top:14px;right:14px;font-size:11px;color:#08111f;background:var(--acc2);
  border-radius:999px;padding:2px 9px;font-weight:800}
.badge.soon{background:var(--warn)}
details{margin-top:12px;font-size:12px;color:var(--mut)}
details summary{cursor:pointer}
details code{display:inline-block;margin-top:6px}

.note{color:var(--mut);font-size:13px;margin-top:16px}
.steps{color:#c4d3e8;font-size:15px;padding-left:20px}
.steps li{margin:8px 0}
.grid-list{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(2,1fr);gap:10px}
.grid-list li{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:14px 16px}

/* ---------- table ---------- */
table{width:100%;border-collapse:collapse;font-size:14px}
th,td{text-align:left;padding:10px 12px;border-bottom:1px solid var(--line)}
th{color:#fff;font-size:13px;background:var(--card2)}
td code{font-size:12px}

/* ---------- faq / prose ---------- */
.faq details{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:14px 18px;margin:9px 0;color:#c4d3e8;font-size:14px}
.faq summary{color:#fff;font-weight:600;font-size:15px}
.prose{color:#c4d3e8;font-size:15px}
.prose h3{margin:24px 0 8px}
.prose ul{padding-left:22px}
.callout{background:var(--card);border:1px solid var(--line);border-left:4px solid var(--acc);
  border-radius:12px;padding:14px 18px;margin:16px 0;color:#c4d3e8;font-size:14px}

/* ---------- footer ---------- */
footer{border-top:1px solid var(--line);margin-top:34px;padding:28px 0;color:var(--mut);font-size:13px}
footer .cols{display:flex;flex-wrap:wrap;gap:28px;justify-content:space-between}
footer a{color:var(--mut)}
footer a:hover{color:#fff}
footer .disc{color:#5d6f8a;font-size:12px;margin-top:16px}

@media(max-width:820px){
  .cards,.cards.two{grid-template-columns:1fr 1fr}
  .grid-list{grid-template-columns:1fr}
  .nav nav a{margin-left:10px;font-size:13px}
}
@media(max-width:600px){
  .cards,.cards.two{grid-template-columns:1fr}
  .hero{padding:48px 0 30px}
  .brand span.t{display:none}
}