/* 色值取自 瓴枢智云 VI v1.2：深蓝 #0C2034、青绿文字 #008258、深底青绿 #00B478；
   行动色 #CC4A26 只用于页面主操作（合成按钮），白字对比 4.6:1 */
:root{--paper:#fcfcfc;--ink:#0c2034;--muted:#5f6b76;--line:#e3e8ef;--accent:#008258;--accent-dark:#00b478;--action:#cc4a26;--action-hover:#b8401f;--panel:#f5f7fa;--term:#0c2034;--term-fg:#dce3ea;--term-dim:#8c99a6;--term-ok:#00b478;
--sans:"Inter","Noto Sans SC","PingFang SC","Microsoft YaHei","Source Han Sans SC",system-ui,sans-serif;--mono:"JetBrains Mono","SFMono-Regular",Menlo,Consolas,"Liberation Mono",monospace}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:72px}
body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.7 var(--sans);-webkit-font-smoothing:antialiased}
a{color:inherit}
a:focus-visible,button:focus-visible,textarea:focus-visible{outline:2px solid var(--accent);outline-offset:3px}
.wrap{max-width:1200px;margin:0 auto;padding:0 24px}
.mono{font-family:var(--mono)}
.muted{color:var(--muted)}
.small{font-size:13px}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}
pre{margin:0;font:12px/1.65 var(--mono);white-space:pre;overflow-x:auto}

.nav{position:sticky;top:0;z-index:5;background:rgba(252,252,252,.94);backdrop-filter:blur(6px);border-bottom:1px solid var(--line)}
.nav-in{display:flex;justify-content:space-between;align-items:center;height:64px}
.brand{display:flex;align-items:center;gap:12px;text-decoration:none}
.brand img{display:block;width:30px;height:auto}
.brand b{font:700 20px var(--mono);padding-left:12px;border-left:1px solid var(--line);line-height:28px}
nav{display:flex;gap:32px;font-size:14px}
nav a{text-decoration:none}
nav a:hover{color:var(--accent)}
.nav-gh{display:inline-flex;align-items:center;gap:6px}
.gh{display:block;flex:none}

.hero{display:grid;grid-template-columns:540px 1fr;gap:80px;align-items:center;padding-top:80px;padding-bottom:88px}
h1{font-size:52px;line-height:1.28;letter-spacing:-.01em;margin:0 0 28px}
.lead{font-size:18px;line-height:1.75;color:var(--muted);margin:0 0 28px}
.actions{display:flex;gap:16px;flex-wrap:wrap}
.btn{display:inline-block;background:var(--ink);color:var(--paper);border:1px solid var(--ink);padding:12px 22px;border-radius:2px;font:500 15px var(--sans);text-decoration:none;cursor:pointer}
.btn:hover{background:#1b3550}
.btn-line{background:none;color:var(--ink)}
.btn-line:hover{background:var(--ink);color:var(--paper)}
.btn-accent{background:var(--action);border-color:var(--action);padding:10px 26px}
.btn-accent:hover{background:var(--action-hover);border-color:var(--action-hover)}
.btn:disabled{opacity:.55;cursor:wait}
.meta{font-size:13px;color:var(--muted);margin:24px 0 28px}
.log{background:var(--term);color:var(--term-fg);padding:18px 22px 20px;font-size:11px}
.dim{color:var(--term-dim)}
.ok{color:var(--term-ok)}
.hero-text,.photo{min-width:0}
.photo{margin:0}
.photo img{display:block;width:100%;height:auto}
.photo figcaption{font-size:12px;color:var(--muted);margin-top:12px}

.doc{border-top:1px solid var(--line);padding:72px 0 80px}
.panel{background:var(--panel)}
.doc-in{display:grid;grid-template-columns:240px 1fr;gap:80px}
.doc-head h2{font-size:26px;line-height:1.4;margin:0 0 10px}
.doc-head p{font-size:14px;color:var(--muted);margin:0}
.doc-body{margin:0;padding:0;min-width:0}
.notes{display:grid;grid-template-columns:repeat(3,1fr);gap:40px;margin-top:16px}
.notes p{margin:0;font-size:13px;color:var(--muted)}

.demo{background:var(--paper);border:1px solid var(--line)}
.demo textarea{display:block;width:100%;border:0;background:none;resize:vertical;font:20px/1.7 var(--sans);color:var(--ink);padding:24px 28px 0;min-height:110px}
.demo textarea:focus{outline:none}
.count{font-size:12px;color:var(--muted);text-align:right;padding:4px 28px 16px}
.controls{display:flex;align-items:center;gap:10px;flex-wrap:wrap;border-top:1px solid var(--line);padding:14px 20px 14px 28px;font-size:13px}
.chip{font:13px var(--sans);background:none;border:1px solid var(--line);border-radius:14px;padding:4px 12px;cursor:pointer;color:var(--ink)}
.chip:hover{border-color:var(--ink)}
#go{margin-left:auto}
.player{display:flex;align-items:center;gap:18px;background:var(--term);color:var(--term-fg);padding:16px 28px}
.player[hidden]{display:none}
.play{width:34px;height:34px;border-radius:50%;border:0;background:var(--paper);cursor:pointer;position:relative;flex:none}
.play::after{content:"";position:absolute;left:13px;top:10px;border-style:solid;border-width:7px 0 7px 11px;border-color:transparent transparent transparent var(--term)}
.play.on::after{left:12px;top:11px;width:4px;height:12px;border-width:0 3px;border-style:solid;border-color:var(--term)}
#wave{flex:1;min-width:0;height:34px;cursor:pointer}
.time{font-size:13px}
.player a{font-size:13px;text-decoration:none}
.player a:hover{text-decoration:underline}
.status{margin:0;padding:0 28px;font-size:13px;color:var(--muted)}
.status:not(:empty){padding:12px 28px 14px;border-top:1px solid var(--line)}

.spec div{display:grid;grid-template-columns:160px 300px 1fr;gap:32px;padding:18px 0;border-top:1px solid var(--line)}
.spec dt{font-weight:500;font-size:15px}
.spec dd{margin:0;font-size:14px;color:var(--muted)}
.spec dd.mono{font-weight:500;font-size:15px;color:var(--ink)}

.steps{list-style:none;display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.steps li{background:var(--paper);border:1px solid var(--line);padding:22px 24px 24px}
.steps h3{font-size:17px;margin:0 0 12px}
.steps h3 span{font:700 15px var(--mono);color:var(--accent);margin-right:10px}
.steps p{margin:0 0 10px;font-size:14px}
.pins{width:100%;border-collapse:collapse;font-size:14px}
.pins th,.pins td{padding:7px 0;border-bottom:1px solid var(--line);text-align:left;font-weight:500}
.pins td{text-align:right;font-weight:400}
.cmd{background:var(--term);color:var(--term-fg);padding:12px 14px;margin-bottom:12px}

.code{background:var(--term);color:var(--term-fg);padding:22px 28px 26px;font-size:13.5px}

#limits{padding:56px 0 60px}
.limits{list-style:none}
.limits li{padding:10px 0 10px 28px;border-top:1px solid var(--line);position:relative;font-size:15px}
.limits li:last-child{border-bottom:1px solid var(--line)}
.limits li::before{content:"—";position:absolute;left:0;color:var(--muted);font-family:var(--mono)}

.tiers{display:grid;grid-template-columns:repeat(3,1fr);gap:48px}
.tiers div{border-top:2px solid var(--ink);padding-top:16px}
.tiers h3{display:flex;justify-content:space-between;align-items:baseline;font-size:18px;margin:0 0 10px}
.tiers h3 span{font-size:12px;font-weight:400;color:var(--muted)}
.tiers p{margin:0;font-size:14px;line-height:1.75;color:var(--muted)}
.fine{font-size:13px;color:var(--muted);margin:28px 0 0}

.cta{background:var(--ink);color:var(--paper)}
.cta-in{display:flex;justify-content:space-between;align-items:center;gap:40px;padding-top:32px;padding-bottom:32px}
.cta-logo{display:block;width:132px;height:auto;margin-bottom:12px}
.cta-gh{text-align:right}
.cta h2{font-size:16px;font-weight:500;margin:0 0 6px}
.cta p{margin:0;color:var(--term-dim);font-size:14px}
.cta p a{color:var(--term-fg)}
.repo{font-size:16px;font-weight:500;color:var(--accent-dark);text-decoration:none;white-space:nowrap}
.repo:hover{color:var(--paper)}
footer{background:var(--ink);color:var(--term-dim);font-size:12px}
.foot-in a{text-decoration:none;margin-left:14px;white-space:nowrap}
.foot-in a:hover{color:var(--term-fg)}
.foot-in img{vertical-align:-2px;margin-right:4px}
.foot-in{display:flex;justify-content:space-between;gap:20px;padding-top:22px;padding-bottom:26px;border-top:1px solid rgba(255,255,255,.1)}

@media (max-width:1100px){
  .hero{grid-template-columns:1fr 1fr;gap:48px}
  .doc-in{grid-template-columns:1fr;gap:28px}
  .spec div{grid-template-columns:130px 1fr}
  .spec dd:last-child{grid-column:2}
}
@media (max-width:760px){
  nav a:not(:first-child):not(:last-child){display:none}
  nav{gap:20px}
  .hero{grid-template-columns:1fr;padding-top:44px;padding-bottom:56px;gap:36px}
  h1{font-size:36px}
  .lead{font-size:16px}
  .doc{padding:52px 0 56px}
  .notes,.steps,.tiers{grid-template-columns:1fr;gap:16px}
  #limits{padding:52px 0 56px}
  .spec div{grid-template-columns:1fr;gap:4px}
  .spec dd:last-child{grid-column:auto}
  .demo textarea{font-size:17px;padding:18px 18px 0}
  .count{padding:4px 18px 12px}
  .controls{padding:12px 18px}
  #go{margin-left:0;width:100%}
  .player{padding:14px 18px;gap:12px;flex-wrap:wrap}
  .code{font-size:12px;padding:18px}
  .cta-in{flex-direction:column;align-items:flex-start;gap:24px}
  .cta-gh{text-align:left}
  .repo{font-size:15px;white-space:normal;word-break:break-all}
  .foot-in{flex-direction:column;gap:6px}
}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}