:root{
  --ink:#1b1f2e; --ink-2:#424a60; --muted:#6b7389; --line:#e6e8f0; --bg:#f6f7fb; --card:#fff;
  --brand:#5b7cff; --brand-2:#7a63ff; --brand-ink:#3f4fd6; --brand-soft:#eef1ff;
  --ok:#11905a; --ok-soft:#e7f7ef; --warn:#a86a00; --warn-soft:#fff6e3; --warn-line:#f2d08b;
  --dark:#14161f; --radius:16px;
  --shadow:0 1px 2px rgba(20,24,46,.04),0 8px 24px rgba(20,24,46,.06);
  --font:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",sans-serif;
  --mono:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:80px}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.75 var(--font);-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{color:var(--brand-ink);text-decoration:none}
a:hover{text-decoration:underline}
code{font:.9em var(--mono);background:#eef0f6;border:1px solid var(--line);border-radius:6px;padding:1px 6px}
kbd{font:13px var(--mono);background:var(--dark);color:#fff;border-radius:6px;padding:2px 8px;box-shadow:0 2px 0 #000;white-space:nowrap}
.wrap{max-width:1120px;margin:0 auto;padding:0 24px}

/* ── 顶栏 ── */
.nav{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.82);backdrop-filter:saturate(1.6) blur(14px);
     -webkit-backdrop-filter:saturate(1.6) blur(14px);border-bottom:1px solid var(--line)}
.nav .wrap{display:flex;align-items:center;gap:28px;height:64px}
.logo{display:flex;align-items:center;gap:10px;font-weight:700;font-size:18px;color:var(--ink)}
.logo img{width:32px;height:32px;border-radius:8px}
.logo:hover{text-decoration:none}
.nav nav{display:flex;gap:24px;margin-left:auto}
.nav nav a{color:var(--ink-2);font-size:15px}
.nav nav a.on,.nav nav a:hover{color:var(--brand-ink);text-decoration:none}
.nav .cta{padding:7px 16px;border-radius:999px;background:var(--ink);color:#fff;font-size:14px;font-weight:600}
.nav .cta:hover{text-decoration:none;background:#000}

/* ── 按钮 ── */
.btn{display:inline-flex;align-items:center;gap:10px;padding:13px 22px;border-radius:12px;font-weight:600;font-size:16px;
     border:1px solid transparent;transition:transform .12s,box-shadow .12s,background .12s;cursor:pointer;line-height:1.2}
.btn:hover{text-decoration:none;transform:translateY(-1px)}
.btn svg{width:20px;height:20px;flex:none}
.btn-primary{background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;box-shadow:0 8px 20px rgba(91,124,255,.35)}
.btn-primary:hover{box-shadow:0 12px 26px rgba(91,124,255,.45)}
.btn-ghost{background:#fff;color:var(--ink);border-color:var(--line)}
.btn-ghost:hover{border-color:#cdd2e2}
.btn small{display:block;font-weight:400;font-size:12px;opacity:.8;margin-top:3px}

/* ── 首屏 ── */
.hero{position:relative;overflow:hidden;padding:72px 0 80px;
      background:radial-gradient(900px 500px at 85% -10%,rgba(122,99,255,.18),transparent 60%),
                 radial-gradient(700px 420px at 0% 0%,rgba(91,124,255,.16),transparent 60%),var(--bg)}
.hero .wrap{display:grid;grid-template-columns:1.1fr .9fr;gap:56px;align-items:center}
.badge{display:inline-flex;align-items:center;gap:8px;padding:4px 12px;border-radius:999px;background:#fff;border:1px solid var(--line);
       font-size:13px;color:var(--ink-2)}
.badge i{width:8px;height:8px;border-radius:50%;background:var(--ok);box-shadow:0 0 0 3px var(--ok-soft)}
.hero h1{font-size:50px;line-height:1.18;margin:20px 0 18px;letter-spacing:-.5px}
.hero h1 em{font-style:normal;background:linear-gradient(135deg,var(--brand),var(--brand-2));-webkit-background-clip:text;background-clip:text;color:transparent}
.hero .lead{font-size:18px;color:var(--ink-2);margin:0 0 30px;max-width:540px}
.hero .actions{display:flex;flex-wrap:wrap;gap:12px}
.hero .meta{margin-top:18px;font-size:14px;color:var(--muted)}
.hero .meta a{margin-left:4px}
.shot-stack{position:relative;height:520px}
.shot-stack .win{position:absolute;border-radius:14px;overflow:hidden;background:var(--dark);
                 box-shadow:0 30px 60px rgba(20,24,46,.28),0 0 0 1px rgba(255,255,255,.06)}
.shot-stack .win .bar{height:28px;display:flex;align-items:center;gap:6px;padding:0 12px;background:#1d2030}
.shot-stack .win .bar i{width:10px;height:10px;border-radius:50%;background:#ff5f57}
.shot-stack .win .bar i:nth-child(2){background:#febc2e}.shot-stack .win .bar i:nth-child(3){background:#28c840}
.shot-stack .w1{width:330px;left:6%;top:0;z-index:2}
.shot-stack .w2{width:300px;right:0;top:120px;z-index:1;opacity:.96}
.shot-stack .tag{position:absolute;z-index:3;padding:8px 14px;border-radius:12px;background:#fff;box-shadow:var(--shadow);font-size:14px;font-weight:600;display:flex;gap:8px;align-items:center}
.shot-stack .tag b{color:var(--ok)}
.shot-stack .t1{left:0;bottom:40px}
.shot-stack .t2{right:8px;top:70px}

/* ── 区块 ── */
section.block{padding:84px 0}
section.block.alt{background:#fff;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.head{text-align:center;max-width:680px;margin:0 auto 48px}
.head .eyebrow{font-size:13px;font-weight:700;letter-spacing:2px;color:var(--brand-ink)}
.head h2{font-size:34px;line-height:1.3;margin:8px 0 12px}
.head p{color:var(--muted);margin:0}

.grid{display:grid;gap:20px}
.g3{grid-template-columns:repeat(3,1fr)}
.g2{grid-template-columns:repeat(2,1fr)}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:26px;box-shadow:var(--shadow)}
.card h3{margin:14px 0 6px;font-size:18px}
.card p{margin:0;color:var(--ink-2);font-size:15px}
.ico{width:44px;height:44px;border-radius:12px;display:flex;align-items:center;justify-content:center;background:var(--brand-soft);color:var(--brand-ink)}
.ico svg{width:24px;height:24px}

/* ── 下载卡 ── */
.dl{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;max-width:920px;margin:0 auto}
.dl .card{padding:32px;display:flex;flex-direction:column}
.dl .card.hl{border-color:var(--brand);box-shadow:0 0 0 3px rgba(91,124,255,.15),var(--shadow)}
.dl .os{display:flex;align-items:center;gap:14px}
.dl .os svg{width:40px;height:40px}
.dl .os h3{margin:0;font-size:22px}
.dl .os span{font-size:13px;color:var(--muted)}
.dl ul{margin:18px 0 24px;padding-left:20px;color:var(--ink-2);font-size:15px}
.dl ul li{margin:4px 0}
.dl .btns{margin-top:auto;display:flex;flex-direction:column;gap:10px}
.dl .btns .btn{justify-content:center}
.dl .hash{margin-top:14px;font:11px/1.5 var(--mono);color:var(--muted);word-break:break-all}
.dl .rec{display:none;margin-left:auto;font-size:12px;font-weight:700;color:var(--brand-ink);background:var(--brand-soft);padding:3px 10px;border-radius:999px}
.dl .card.hl .rec{display:inline-block}

/* ── 三步上手 ── */
.steps3{counter-reset:s;display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.steps3 .card{position:relative;padding-top:56px}
.steps3 .card::before{counter-increment:s;content:counter(s);position:absolute;top:22px;left:26px;width:28px;height:28px;border-radius:50%;
  background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;font-weight:700;font-size:14px;display:flex;align-items:center;justify-content:center}

/* ── 提示框 ── */
.tip,.warn{border-radius:12px;padding:14px 18px;margin:16px 0;font-size:15px}
.tip{background:var(--brand-soft);border:1px solid #d5dcff}
.warn{background:var(--warn-soft);border:1px solid var(--warn-line)}

/* ── 底部 ── */
.foot-cta{text-align:center;padding:72px 0;background:linear-gradient(135deg,#4b5fe0,#7a63ff);color:#fff}
.foot-cta h2{font-size:30px;margin:0 0 10px}
.foot-cta p{opacity:.9;margin:0 0 26px}
.foot-cta .btn-ghost{border-color:transparent}
footer.site{padding:28px 0;color:var(--muted);font-size:13px}
footer.site .wrap{display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px}

/* ── 教程页 ── */
.doc-hero{padding:56px 0 36px;background:radial-gradient(700px 360px at 90% -20%,rgba(122,99,255,.16),transparent 60%),var(--bg);border-bottom:1px solid var(--line)}
.doc-hero h1{font-size:38px;margin:10px 0 8px}
.doc-hero p{color:var(--ink-2);margin:0}
.doc{display:grid;grid-template-columns:220px 1fr;gap:48px;padding:40px 24px 80px}
.toc{position:sticky;top:88px;align-self:start;font-size:14px}
.toc b{display:block;font-size:12px;letter-spacing:1.5px;color:var(--muted);margin-bottom:10px}
.toc a{display:block;padding:6px 12px;border-left:2px solid var(--line);color:var(--ink-2)}
.toc a:hover{text-decoration:none;color:var(--brand-ink);border-left-color:var(--brand)}
.toc a.on{color:var(--brand-ink);border-left-color:var(--brand);font-weight:600}
.article{min-width:0}
.article section{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:32px 36px;margin-bottom:24px;box-shadow:var(--shadow)}
.article h2{font-size:24px;margin:0 0 16px;display:flex;align-items:center;gap:12px}
.article h2 .no{flex:none;width:32px;height:32px;border-radius:9px;background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;font-size:15px;display:flex;align-items:center;justify-content:center}
.article h3{font-size:18px;margin:28px 0 8px;color:var(--brand-ink)}
.article p{margin:10px 0}
.article table{border-collapse:collapse;width:100%;margin:14px 0;font-size:15px}
.article th,.article td{border:1px solid var(--line);padding:10px 12px;text-align:left;vertical-align:top}
.article th{background:#f4f5fa;font-weight:600}
.tbl{overflow-x:auto}
ol.steps{counter-reset:st;list-style:none;padding:0;margin:14px 0}
ol.steps>li{counter-increment:st;position:relative;padding:0 0 14px 42px}
ol.steps>li::before{content:counter(st);position:absolute;left:0;top:2px;width:26px;height:26px;border-radius:50%;background:var(--brand);color:#fff;
  font-size:13px;font-weight:700;display:flex;align-items:center;justify-content:center}
figure{margin:22px 0;text-align:center}
figure img{margin:0 auto;border-radius:12px;border:1px solid #2c3042;box-shadow:0 14px 30px rgba(20,24,46,.2);background:var(--dark)}
figure.s img{max-width:340px}
figure.m img{max-width:440px}
figure.l img{max-width:600px}
figcaption{font-size:14px;color:var(--muted);margin-top:10px}
.pill{display:inline-block;padding:1px 10px;border-radius:999px;font-size:13px;font-weight:600;white-space:nowrap}
.pill.send{background:#e8efff;color:#2448d8;border:1px solid #c3d2ff}
.pill.recv{background:var(--ok-soft);color:var(--ok);border:1px solid #b5e3cb}
.st{font-weight:700;white-space:nowrap}.st.g{color:var(--ok)}.st.y{color:#b57700}.st.r{color:#c9362c}
.os-tabs{display:flex;gap:8px;margin:6px 0 4px}
.os-tabs button{font:inherit;font-size:14px;padding:6px 16px;border-radius:999px;border:1px solid var(--line);background:#fff;color:var(--ink-2);cursor:pointer}
.os-tabs button.on{background:var(--ink);color:#fff;border-color:var(--ink)}
.os-pane{display:none}.os-pane.on{display:block}

/* ── 响应式 ── */
@media (max-width:960px){
  .hero .wrap{grid-template-columns:1fr}
  .shot-stack{height:440px;max-width:520px;margin:0 auto;width:100%}
  .shot-stack .w1{width:280px}.shot-stack .w2{width:250px}
  .g3,.steps3{grid-template-columns:1fr 1fr}
  .doc{grid-template-columns:1fr}
  .toc{display:none}
}
@media (max-width:680px){
  .wrap{padding:0 16px}
  .nav nav a:not(.cta){display:none}
  .hero{padding:44px 0 56px}
  .hero h1{font-size:34px}
  .hero .lead{font-size:16px}
  .hero .actions .btn{width:100%;justify-content:center}
  .shot-stack{height:380px}
  .shot-stack .w1{width:230px;left:0}.shot-stack .w2{width:210px;top:100px}
  .shot-stack .t2{display:none}
  section.block{padding:60px 0}
  .head h2{font-size:26px}
  .g3,.g2,.steps3,.dl{grid-template-columns:1fr}
  .doc{padding:24px 16px 56px}
  .article section{padding:22px 18px}
  .doc-hero h1{font-size:28px}
}