/* 龙虎斗游戏官网 - AI Game Development Studio / UGC Creator Lab
   纯 CSS3，无远程字体，无框架 */
:root{
  --bg:#0b0f14;
  --bg-2:#10161e;
  --bg-3:#151d27;
  --panel:#121a24;
  --panel-2:#182230;
  --line:#22303f;
  --line-2:#2e3f52;
  --text:#e6edf3;
  --text-2:#a9b7c6;
  --text-3:#7a8a9c;
  --blue:#2f6fed;
  --blue-2:#1d4fb8;
  --cyan:#22d3ee;
  --green:#34d399;
  --purple:#a78bfa;
  --amber:#fbbf24;
  --red:#f87171;
  --white:#f5f8fb;
  --mono:Consolas,"SFMono-Regular",Menlo,Monaco,"Courier New",monospace;
  --sans:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans CJK SC",sans-serif;
  --radius:12px;
  --max:1180px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;font-family:var(--sans);background:var(--bg);color:var(--text);line-height:1.8;font-size:16px;overflow-x:hidden}
body::before{content:"";position:fixed;inset:0;z-index:-1;background:
  linear-gradient(rgba(34,211,238,.035) 1px,transparent 1px) 0 0/40px 40px,
  linear-gradient(90deg,rgba(34,211,238,.035) 1px,transparent 1px) 0 0/40px 40px,
  radial-gradient(1200px 600px at 20% -10%,rgba(47,111,237,.18),transparent 60%),
  radial-gradient(900px 500px at 100% 10%,rgba(167,139,250,.12),transparent 60%),
  var(--bg)}
img,svg{max-width:100%;height:auto;display:block}
a{color:var(--cyan);text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3,h4{line-height:1.35;margin:0 0 .6em;font-weight:700;color:var(--white)}
h1{font-size:clamp(1.5rem,3.2vw,2.35rem)}
h2{font-size:clamp(1.3rem,2.4vw,1.75rem)}
h3{font-size:clamp(1.1rem,1.8vw,1.3rem)}
h4{font-size:1.05rem}
p{margin:0 0 1em}
ul,ol{padding-left:1.4em;margin:0 0 1em}
li{margin-bottom:.35em}
code{font-family:var(--mono);font-size:.9em;background:rgba(34,211,238,.1);color:var(--cyan);padding:.1em .4em;border-radius:4px}
pre{font-family:var(--mono);font-size:.82rem;line-height:1.6;background:#0a0e13;border:1px solid var(--line);border-radius:10px;padding:1rem;overflow-x:auto;color:#cfe3ef;margin:0 0 1.2em}
pre .k{color:var(--purple)}pre .s{color:var(--green)}pre .c{color:var(--text-3)}pre .n{color:var(--cyan)}pre .e{color:var(--red)}pre .w{color:var(--amber)}
.wrap{max-width:var(--max);margin:0 auto;padding:0 20px}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

/* Header */
.site-header{position:sticky;top:0;z-index:50;background:rgba(11,15,20,.88);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.site-header .wrap{display:flex;align-items:center;justify-content:space-between;min-height:64px;gap:12px}
.logo{display:flex;align-items:center;gap:10px;color:var(--white);font-weight:700;font-size:1.05rem;white-space:nowrap}
.logo:hover{text-decoration:none}
.logo img{width:36px;height:36px}
.logo small{display:block;font-size:.68rem;font-weight:400;color:var(--text-3);line-height:1.2}
.nav{display:flex;gap:2px;flex-wrap:wrap}
.nav a{padding:8px 11px;border-radius:8px;color:var(--text-2);font-size:.92rem;white-space:nowrap}
.nav a:hover,.nav a.active{background:rgba(47,111,237,.16);color:var(--white);text-decoration:none}
.nav a.active{box-shadow:inset 0 -2px 0 var(--cyan)}
.nav-toggle{display:none;background:var(--panel-2);border:1px solid var(--line-2);color:var(--white);border-radius:8px;padding:8px 10px;cursor:pointer;font-size:.9rem}

/* Hero */
.hero{padding:56px 0 40px;position:relative}
.hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:36px;align-items:center}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-family:var(--mono);font-size:.78rem;color:var(--cyan);background:rgba(34,211,238,.08);border:1px solid rgba(34,211,238,.25);padding:4px 10px;border-radius:999px;margin-bottom:14px}
.eyebrow::before{content:"";width:7px;height:7px;border-radius:50%;background:var(--green);box-shadow:0 0 8px var(--green)}
.hero p.lead{font-size:1.05rem;color:var(--text-2)}
.hero-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}
.btn{display:inline-block;padding:10px 18px;border-radius:9px;font-weight:600;font-size:.93rem;border:1px solid transparent;transition:.2s}
.btn:hover{text-decoration:none;transform:translateY(-1px)}
.btn-primary{background:linear-gradient(135deg,var(--blue),#1fb6d1);color:#fff}
.btn-ghost{border-color:var(--line-2);color:var(--text)}
.btn-ghost:hover{border-color:var(--cyan)}
.hero-panel{background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:14px;box-shadow:0 20px 60px rgba(0,0,0,.35)}
.hero-panel .bar{display:flex;gap:6px;margin-bottom:10px}
.hero-panel .bar i{width:10px;height:10px;border-radius:50%;background:var(--line-2)}
.hero-panel .bar i:nth-child(1){background:#ff5f57}.hero-panel .bar i:nth-child(2){background:#febc2e}.hero-panel .bar i:nth-child(3){background:#28c840}
.kw-cloud{display:flex;flex-wrap:wrap;gap:8px;margin-top:20px}
.kw-cloud span{font-size:.78rem;color:var(--text-2);border:1px solid var(--line);padding:3px 9px;border-radius:6px;background:rgba(255,255,255,.02)}

/* Sections */
section{padding:44px 0}
.section-head{margin-bottom:22px}
.section-head .tag{font-family:var(--mono);font-size:.75rem;color:var(--purple);letter-spacing:.08em;text-transform:uppercase;margin-bottom:6px}
.section-head p{color:var(--text-2);max-width:820px}
.alt{background:linear-gradient(180deg,rgba(24,34,48,.5),rgba(24,34,48,0))}
.divider{border:0;border-top:1px solid var(--line);margin:0}

/* Loop strip */
.loop-strip{display:grid;grid-template-columns:repeat(8,1fr);gap:8px}
.loop-strip div{background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:12px 10px;text-align:center;position:relative}
.loop-strip div b{display:block;font-family:var(--mono);color:var(--cyan);font-size:.85rem}
.loop-strip div span{font-size:.78rem;color:var(--text-2)}
.loop-strip div em{position:absolute;top:6px;left:8px;font-style:normal;font-size:.65rem;color:var(--text-3);font-family:var(--mono)}
.loop-strip div:not(:last-child)::after{content:"→";position:absolute;right:-11px;top:50%;transform:translateY(-50%);color:var(--line-2);font-size:.9rem}

/* Cards */
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:20px;transition:border-color .2s}
.card:hover{border-color:var(--line-2)}
.card h3{font-size:1.05rem}
.card p{color:var(--text-2);font-size:.95rem}
.card .cat{font-family:var(--mono);font-size:.72rem;color:var(--green);margin-bottom:6px}
.card .more{font-size:.88rem}
.card.compact p{font-size:.9rem;margin-bottom:.6em}

/* Article (feature) */
.feature{display:grid;grid-template-columns:1fr;gap:20px}
.feature.with-figure{grid-template-columns:1.4fr 1fr}
.article{background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:28px}
.article .meta{display:flex;flex-wrap:wrap;gap:12px;font-size:.8rem;color:var(--text-3);font-family:var(--mono);margin-bottom:10px}
.article .meta .cat{color:var(--purple)}
.article h2,.article h3.title{font-size:clamp(1.15rem,2vw,1.45rem);line-height:1.5}
.article p{color:var(--text-2)}
.article h4{color:var(--cyan);margin-top:1.3em;font-size:1rem}
.article .full{display:none}
.article.expanded .full{display:block}
.readmore{background:none;border:1px solid var(--line-2);color:var(--cyan);padding:8px 16px;border-radius:8px;cursor:pointer;font-size:.9rem;margin-top:6px}
.readmore:hover{border-color:var(--cyan)}
.figure{background:var(--panel-2);border:1px solid var(--line);border-radius:16px;padding:16px;align-self:start;position:sticky;top:80px}
.figure figcaption{font-size:.8rem;color:var(--text-3);margin-top:8px;font-family:var(--mono)}

/* compare table */
.compare{width:100%;border-collapse:collapse;font-size:.9rem;margin:0 0 1.2em}
.compare th,.compare td{border:1px solid var(--line);padding:9px 12px;text-align:left;vertical-align:top}
.compare th{background:var(--panel-2);color:var(--white);font-weight:600}
.compare td{color:var(--text-2)}
.table-scroll{overflow-x:auto;-webkit-overflow-scrolling:touch}
.note{border-left:3px solid var(--amber);background:rgba(251,191,36,.06);padding:10px 14px;border-radius:0 8px 8px 0;color:var(--text-2);font-size:.92rem;margin:0 0 1.2em}
.note.ok{border-color:var(--green);background:rgba(52,211,153,.06)}
.note.bad{border-color:var(--red);background:rgba(248,113,113,.06)}

/* stack list */
.stack{list-style:none;padding:0;margin:0 0 1em;display:grid;gap:6px}
.stack li{background:var(--panel-2);border:1px solid var(--line);border-radius:8px;padding:8px 12px;font-size:.9rem;display:flex;gap:10px;align-items:flex-start}
.stack li b{font-family:var(--mono);color:var(--cyan);min-width:110px;font-weight:600;font-size:.82rem;padding-top:2px}
.stack li span{color:var(--text-2)}

/* observations */
.observe{border-left:3px solid var(--purple)}
.observe .meta .cat{color:var(--purple)}

/* Tabs / demo */
.tabs{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:14px}
.tabs button{background:var(--panel-2);border:1px solid var(--line);color:var(--text-2);padding:7px 13px;border-radius:8px;cursor:pointer;font-size:.86rem;font-family:var(--mono)}
.tabs button.active{background:rgba(34,211,238,.12);color:var(--cyan);border-color:rgba(34,211,238,.4)}
.tab-panel{display:none;background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:20px}
.tab-panel.active{display:block}
.tab-panel p{color:var(--text-2);font-size:.95rem}
.demo-editor{display:grid;grid-template-columns:1fr 1.2fr;gap:14px}
.demo-editor .chat{background:#0a0e13;border:1px solid var(--line);border-radius:10px;padding:12px;font-size:.88rem}
.demo-editor .chat .u{color:var(--amber);font-family:var(--mono)}
.demo-editor .chat .a{color:var(--text-2)}
.demo-editor .params{background:var(--panel-2);border:1px solid var(--line);border-radius:10px;padding:12px}
.param{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:6px 0;border-bottom:1px dashed var(--line);font-size:.86rem}
.param:last-child{border:0}
.param label{color:var(--text-2)}
.param output,.param b{font-family:var(--mono);color:var(--cyan)}
.param input[type=range]{width:120px;accent-color:var(--cyan)}
.chips{display:flex;flex-wrap:wrap;gap:6px;margin-top:10px}
.chips button{background:var(--panel);border:1px solid var(--line-2);color:var(--text);border-radius:999px;padding:4px 11px;cursor:pointer;font-size:.8rem}
.chips button:hover{border-color:var(--cyan);color:var(--cyan)}
.version-log{font-family:var(--mono);font-size:.78rem;color:var(--text-3);margin-top:10px;max-height:110px;overflow:auto}
.version-log div{padding:2px 0;border-bottom:1px dotted var(--line)}
.version-log .v{color:var(--green)}

/* FAQ */
.faq{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
.faq details{background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:0 16px}
.faq summary{cursor:pointer;padding:13px 0;font-weight:600;color:var(--white);list-style:none;position:relative;padding-right:26px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";position:absolute;right:0;top:11px;color:var(--cyan);font-family:var(--mono);font-size:1.1rem}
.faq details[open] summary::after{content:"−"}
.faq details p{color:var(--text-2);font-size:.92rem;padding-bottom:12px}

/* Breadcrumb */
.breadcrumb{font-size:.82rem;color:var(--text-3);padding:14px 0 0}
.breadcrumb ol{list-style:none;padding:0;margin:0;display:flex;flex-wrap:wrap;gap:6px}
.breadcrumb li+li::before{content:"/";margin-right:6px;color:var(--line-2)}

/* Page hero for subpages */
.page-hero{padding:34px 0 26px}
.page-hero .grid-2{align-items:center}
.page-hero p{color:var(--text-2)}
.page-intro{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:22px 24px;margin-bottom:24px}
.page-intro p{color:var(--text-2);margin-bottom:.7em}

/* App features */
.features{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.features div{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:16px}
.features div b{display:block;color:var(--white);margin-bottom:4px}
.features div i{display:inline-block;font-style:normal;font-family:var(--mono);color:var(--cyan);font-size:.75rem;margin-bottom:6px}
.features div span{font-size:.86rem;color:var(--text-2)}
.download-box{background:linear-gradient(135deg,rgba(47,111,237,.16),rgba(167,139,250,.12));border:1px solid var(--line-2);border-radius:16px;padding:24px}
.download-box .stores{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:14px}
.download-box .stores div{background:rgba(11,15,20,.6);border:1px dashed var(--line-2);border-radius:10px;padding:14px;text-align:center;font-size:.9rem;color:var(--text-2)}
.download-box .stores div b{display:block;color:var(--white);margin-bottom:4px}

/* Footer */
.site-footer{border-top:1px solid var(--line);padding:36px 0 28px;background:rgba(10,14,19,.8);font-size:.88rem;color:var(--text-3)}
.footer-grid{display:grid;grid-template-columns:1.3fr 1fr 1.4fr;gap:26px;margin-bottom:22px}
.site-footer h4{color:var(--white);font-size:.95rem}
.site-footer ul{list-style:none;padding:0;margin:0}
.site-footer li{margin-bottom:4px}
.site-footer a{color:var(--text-2)}
.site-footer .legal{border-top:1px solid var(--line);padding-top:16px;font-size:.8rem;line-height:1.7}
.site-footer .legal p{margin-bottom:.5em}
.site-footer .icp{color:var(--text-2)}

#toTop{position:fixed;right:18px;bottom:18px;width:42px;height:42px;border-radius:50%;background:var(--panel-2);border:1px solid var(--line-2);color:var(--cyan);cursor:pointer;display:none;font-size:1.1rem;z-index:40}
#toTop.show{display:block}

/* Responsive */
@media (max-width:1024px){
  .hero-grid{grid-template-columns:1fr}
  .feature.with-figure{grid-template-columns:1fr}
  .figure{position:static}
  .grid-4,.features{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr}
  .loop-strip{grid-template-columns:repeat(4,1fr)}
  .loop-strip div:nth-child(4)::after{display:none}
}
@media (max-width:768px){
  .nav{display:none;position:absolute;left:0;right:0;top:64px;background:var(--bg-2);border-bottom:1px solid var(--line);padding:10px 20px 14px;flex-direction:column}
  .nav.open{display:flex}
  .nav-toggle{display:block}
  .grid-2,.grid-3,.faq,.demo-editor{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .article{padding:20px}
  section{padding:32px 0}
  .download-box .stores{grid-template-columns:1fr}
  .loop-strip{grid-template-columns:repeat(2,1fr)}
  .loop-strip div::after{display:none!important}
  .hero{padding:36px 0 28px}
}
@media (max-width:430px){
  .grid-4,.features{grid-template-columns:1fr}
  .stack li{flex-direction:column;gap:2px}
  .stack li b{min-width:0}
  .logo small{display:none}
  .nav a{font-size:.95rem}
}