/* 龙虎斗游戏官网 - Generative World Model Lab / AI Game Companion Command Center
   纯 CSS3，无框架，无远程字体 */
:root{
  --night:#0a1220;
  --night-2:#0e1a2e;
  --graphite:#141b27;
  --graphite-2:#1b2432;
  --line:#243145;
  --ice:#9fd3ff;
  --cyan:#22e0ff;
  --cyan-dim:rgba(34,224,255,.14);
  --white:#eef4fb;
  --muted:#9fb0c6;
  --orange:#ff8a3d;
  --orange-dim:rgba(255,138,61,.16);
  --radius:14px;
  --maxw:1180px;
  --font:"PingFang SC","Microsoft YaHei","Noto Sans CJK SC","Hiragino Sans GB","Source Han Sans SC",system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  --mono:"SF Mono",Consolas,"Cascadia Code",Menlo,monospace;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--night);color:var(--white);font-family:var(--font);font-size:16px;line-height:1.85;overflow-x:hidden}
img,svg{max-width:100%;height:auto;display:block}
a{color:var(--ice);text-decoration:none}
a:hover{color:var(--cyan)}
h1,h2,h3,h4{line-height:1.35;margin:0 0 .6em;font-weight:700;letter-spacing:.01em}
h1{font-size:clamp(1.55rem,3.4vw,2.5rem)}
h2{font-size:clamp(1.3rem,2.4vw,1.8rem)}
h3{font-size:clamp(1.08rem,1.6vw,1.25rem)}
p{margin:0 0 1em}
ul,ol{padding-left:1.4em}
strong{color:#fff}
code{font-family:var(--mono);background:var(--graphite-2);padding:.1em .4em;border-radius:6px;font-size:.92em;color:var(--ice)}
.container{width:min(var(--maxw),calc(100% - 2rem));margin:0 auto}
.skip-link{position:absolute;left:-999px;top:0;background:var(--cyan);color:var(--night);padding:.5rem 1rem;z-index:99}
.skip-link:focus{left:1rem;top:1rem}

/* 背景网格 */
.grid-bg{position:fixed;inset:0;z-index:-1;pointer-events:none;
  background-image:linear-gradient(rgba(159,211,255,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(159,211,255,.05) 1px,transparent 1px);
  background-size:48px 48px;
  mask-image:radial-gradient(ellipse at 50% 0%,#000 0%,transparent 70%);-webkit-mask-image:radial-gradient(ellipse at 50% 0%,#000 0%,transparent 70%)}

/* Header */
.site-header{position:sticky;top:0;z-index:50;background:rgba(10,18,32,.86);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.nav-wrap{display:flex;align-items:center;justify-content:space-between;gap:1rem;min-height:64px}
.brand{display:flex;align-items:center;gap:.6rem;color:var(--white);font-weight:700;font-size:1.05rem;white-space:nowrap}
.brand img{width:36px;height:36px}
.brand small{display:block;font-weight:400;font-size:.68rem;color:var(--muted);letter-spacing:.08em;line-height:1.1}
.site-nav{display:flex;gap:.2rem;flex-wrap:wrap}
.site-nav a{color:var(--muted);padding:.45rem .7rem;border-radius:8px;font-size:.9rem;white-space:nowrap}
.site-nav a:hover,.site-nav a[aria-current="page"]{color:var(--white);background:var(--cyan-dim)}
.nav-toggle{display:none;background:none;border:1px solid var(--line);border-radius:8px;width:44px;height:40px;padding:0;cursor:pointer;flex-direction:column;align-items:center;justify-content:center;gap:5px}
.nav-toggle span{display:block;width:20px;height:2px;background:var(--ice);transition:.2s}
.nav-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* Breadcrumb */
.breadcrumb{font-size:.85rem;color:var(--muted);padding:.7rem 0}
.breadcrumb ol{list-style:none;padding:0;margin:0;display:flex;flex-wrap:wrap;gap:.35rem}
.breadcrumb li+li::before{content:"/";margin-right:.35rem;color:var(--line)}
.breadcrumb [aria-current]{color:var(--ice)}

/* Hero */
.page-hero{padding:2.5rem 0 2rem;position:relative;overflow:hidden}
.page-hero::before{content:"";position:absolute;inset:0;background:radial-gradient(60% 60% at 80% 20%,rgba(34,224,255,.16),transparent 70%),radial-gradient(40% 50% at 10% 90%,rgba(255,138,61,.12),transparent 70%);pointer-events:none}
.hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:2.5rem;align-items:center;position:relative}
.eyebrow{font-family:var(--mono);font-size:.74rem;letter-spacing:.16em;text-transform:uppercase;color:var(--cyan);margin-bottom:.6rem}
.lead{font-size:1.06rem;color:var(--muted)}
.hero-actions{display:flex;flex-wrap:wrap;gap:.7rem;margin-top:1.2rem}
.btn{display:inline-block;padding:.65rem 1.2rem;border-radius:10px;font-weight:600;border:1px solid var(--line);color:var(--white);background:var(--graphite);transition:.2s}
.btn:hover{border-color:var(--cyan);color:var(--cyan)}
.btn-primary{background:linear-gradient(135deg,var(--cyan),#3aa3ff);color:var(--night);border-color:transparent}
.btn-primary:hover{color:var(--night);filter:brightness(1.08)}
.hero-figure{margin:0;background:var(--graphite);border:1px solid var(--line);border-radius:var(--radius);padding:.8rem;box-shadow:0 20px 60px rgba(0,0,0,.35)}
.hero-figure figcaption{font-size:.8rem;color:var(--muted);padding:.5rem .2rem 0}
.hero-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:.8rem;margin-top:1.6rem}
.hero-stats div{background:rgba(20,27,39,.7);border:1px solid var(--line);border-radius:10px;padding:.7rem .8rem}
.hero-stats strong{display:block;font-family:var(--mono);color:var(--cyan);font-size:.95rem}
.hero-stats span{font-size:.78rem;color:var(--muted)}

/* Sections */
.section{padding:3rem 0;border-top:1px solid rgba(36,49,69,.6)}
.section-alt{background:linear-gradient(180deg,rgba(14,26,46,.7),transparent)}
.section-head{max-width:820px;margin-bottom:1.8rem}
.section-intro{color:var(--muted)}
.two-col{display:grid;grid-template-columns:1fr 1fr;gap:2rem;align-items:start}
.two-col>*,.hero-grid>*,.company>*,.card-grid>*,.feature-grid>*,.footer-grid>*,.layers>li,.diagram,.post,.container{min-width:0}
.text-muted{color:var(--muted)}

/* 技术链 */
.chain{list-style:none;padding:0;margin:1rem 0 1.5rem;display:flex;flex-wrap:wrap;gap:.5rem;counter-reset:chain}
.chain li{position:relative;background:var(--graphite);border:1px solid var(--line);border-radius:10px;padding:.5rem .8rem .5rem 2.1rem;font-size:.9rem;font-family:var(--mono);counter-increment:chain}
.chain li::before{content:counter(chain,decimal-leading-zero);position:absolute;left:.65rem;top:.55rem;font-size:.7rem;color:var(--cyan)}
.chain li::after{content:"\2193";position:absolute;right:-.85rem;top:50%;transform:translateY(-50%) rotate(-90deg);color:var(--orange);font-size:.9rem}
.chain li:last-child::after{content:none}
.chain-vertical{flex-direction:column}
.chain-vertical li::after{transform:translate(-50%,0);right:auto;left:50%;top:auto;bottom:-1.05rem}
.chain-vertical li:last-child::after{content:none}

/* 层级 */
.layers{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(4,1fr);gap:.8rem}
.layers li{background:var(--graphite);border:1px solid var(--line);border-radius:12px;padding:1rem;display:flex;gap:.7rem;align-items:flex-start}
.layer-no{font-family:var(--mono);color:var(--orange);font-size:.8rem;flex:0 0 auto;padding-top:.2rem}
.layers strong{display:block;color:var(--white);margin-bottom:.2rem}
.layers p{font-size:.85rem;color:var(--muted);margin:0}

/* 文章 */
.post{background:var(--graphite);border:1px solid var(--line);border-radius:var(--radius);padding:2rem;margin-bottom:2rem}
.post-head{margin-bottom:1.2rem}
.post-head h2,.post-head h3{margin-top:.5rem}
.tag{display:inline-block;font-size:.74rem;font-family:var(--mono);letter-spacing:.06em;color:var(--cyan);background:var(--cyan-dim);border:1px solid rgba(34,224,255,.3);padding:.15rem .55rem;border-radius:999px}
.tag-orange{color:var(--orange);background:var(--orange-dim);border-color:rgba(255,138,61,.4)}
.meta{font-size:.82rem;color:var(--muted);font-family:var(--mono)}
.post-body{max-width:860px}
.post-body h3{margin-top:1.6rem;color:var(--ice)}
.post-body h4{margin-top:1.2rem;font-size:1rem;color:var(--ice)}
.post-extra{margin-top:.6rem}
.post-extra>summary{cursor:pointer;list-style:none;display:inline-block;padding:.5rem 1rem;border:1px solid var(--line);border-radius:10px;color:var(--cyan);font-weight:600;font-size:.9rem;user-select:none}
.post-extra>summary::-webkit-details-marker{display:none}
.post-extra>summary::after{content:" 展开全文"}
.post-extra[open]>summary::after{content:" 收起全文"}
.post-extra>summary:hover{border-color:var(--cyan)}
.post-extra .inner{padding-top:1rem}
.diagram{margin:1.6rem 0;background:var(--night-2);border:1px solid var(--line);border-radius:12px;padding:.8rem}
.diagram-scroll{overflow-x:auto;-webkit-overflow-scrolling:touch}
.diagram-scroll img{min-width:560px;width:100%}
.diagram figcaption{font-size:.82rem;color:var(--muted);padding:.5rem .3rem 0;font-family:var(--mono)}
.callout{border-left:3px solid var(--orange);background:var(--orange-dim);padding:.9rem 1.1rem;border-radius:0 10px 10px 0;margin:1.2rem 0;font-size:.95rem}
.callout-cyan{border-left-color:var(--cyan);background:var(--cyan-dim)}
.checklist{list-style:none;padding:0;margin:1rem 0}
.checklist li{padding-left:1.6rem;position:relative;margin-bottom:.4rem}
.checklist li::before{content:"";position:absolute;left:0;top:.65em;width:.75rem;height:.75rem;border:2px solid var(--cyan);border-radius:3px}
.checklist li.bad::before{border-color:var(--orange)}

/* 表格 */
.table-scroll{overflow-x:auto;margin:1.2rem 0;-webkit-overflow-scrolling:touch}
table.compare{border-collapse:collapse;width:100%;min-width:560px;font-size:.92rem}
table.compare th,table.compare td{border:1px solid var(--line);padding:.6rem .8rem;text-align:left;vertical-align:top}
table.compare th{background:var(--graphite-2);color:var(--ice);font-family:var(--mono);font-size:.82rem}
table.compare tr:nth-child(even) td{background:rgba(27,36,50,.5)}

/* 卡片 */
.card-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1rem}
.card{background:var(--graphite);border:1px solid var(--line);border-radius:12px;padding:1.3rem;display:flex;flex-direction:column;gap:.5rem;transition:.2s}
.card:hover{border-color:rgba(34,224,255,.5);transform:translateY(-2px)}
.card h3{font-size:1.02rem;margin:.3rem 0 .2rem}
.card h3 a{color:var(--white)}
.card h3 a:hover{color:var(--cyan)}
.card p{font-size:.92rem;color:var(--muted);margin:0;flex:1}
.card .meta{margin-top:.3rem}
.more-link{font-size:.88rem;font-weight:600}
.card-wide{grid-column:span 3}
.feature-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:.9rem}
.feature{background:var(--graphite);border:1px solid var(--line);border-radius:12px;padding:1rem}
.feature .no{font-family:var(--mono);color:var(--orange);font-size:.78rem}
.feature h3{font-size:1rem;margin:.3rem 0}
.feature p{font-size:.86rem;color:var(--muted);margin:0}

/* 观察栏目 */
.observe{background:linear-gradient(160deg,var(--graphite),var(--night-2));border:1px solid var(--line);border-radius:var(--radius);padding:1.6rem;margin-bottom:1.2rem}
.observe h3{color:var(--white)}

/* FAQ */
.faq-list{display:grid;grid-template-columns:1fr 1fr;gap:.7rem}
.faq-item{background:var(--graphite);border:1px solid var(--line);border-radius:10px;padding:0}
.faq-item summary{cursor:pointer;padding:.9rem 2.4rem .9rem 1rem;font-weight:600;list-style:none;position:relative;color:var(--white)}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:"+";position:absolute;right:1rem;top:.75rem;color:var(--cyan);font-size:1.2rem;font-family:var(--mono)}
.faq-item[open] summary::after{content:"\2212"}
.faq-answer{padding:0 1rem 1rem;color:var(--muted);font-size:.93rem}
.faq-answer p{margin:0 0 .6em}

/* 公司 */
.company{display:grid;grid-template-columns:1fr 1fr;gap:2rem;align-items:center}
.notice{font-size:.85rem;color:var(--muted);background:var(--graphite);border:1px dashed var(--line);border-radius:10px;padding:.9rem 1rem;margin-top:1rem}

/* Footer */
.site-footer{border-top:1px solid var(--line);background:#070d18;padding:2.5rem 0 1.5rem;margin-top:2rem;font-size:.9rem;color:var(--muted)}
.footer-grid{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:2rem}
.footer-grid h4{color:var(--white);font-size:.95rem;margin-bottom:.6rem}
.footer-grid ul{list-style:none;padding:0;margin:0}
.footer-grid li{margin-bottom:.35rem}
.footer-bottom{border-top:1px solid var(--line);margin-top:1.6rem;padding-top:1rem;font-size:.82rem;text-align:center}
.footer-bottom p{margin:.2rem 0}
.to-top{position:fixed;right:1rem;bottom:1rem;width:42px;height:42px;border-radius:50%;background:var(--graphite);border:1px solid var(--line);color:var(--cyan);font-size:1.1rem;cursor:pointer;opacity:0;pointer-events:none;transition:.25s;z-index:40}
.to-top.show{opacity:1;pointer-events:auto}

/* TOC */
.toc{background:var(--night-2);border:1px solid var(--line);border-radius:12px;padding:1rem 1.2rem;margin-bottom:2rem;font-size:.9rem}
.toc ol{margin:0;padding-left:1.2em;columns:2;column-gap:2rem}
.toc li{margin-bottom:.3rem;break-inside:avoid}

/* Reveal */
html.js .reveal{opacity:0;transform:translateY(14px);transition:opacity .5s ease,transform .5s ease}
html.js .reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none;transition:none}html{scroll-behavior:auto}}

/* 响应式 */
@media (max-width:1024px){
  .layers{grid-template-columns:repeat(2,1fr)}
  .feature-grid{grid-template-columns:repeat(2,1fr)}
  .card-grid{grid-template-columns:repeat(2,1fr)}
  .card-wide{grid-column:span 2}
  .hero-grid{grid-template-columns:1fr;gap:1.6rem}
  .site-nav a{font-size:.84rem;padding:.4rem .5rem}
}
@media (max-width:768px){
  body{font-size:15.5px}
  .nav-toggle{display:flex}
  .site-nav{display:none;position:absolute;left:0;right:0;top:64px;background:var(--night-2);border-bottom:1px solid var(--line);flex-direction:column;padding:.6rem 1rem 1rem}
  .site-nav.open{display:flex}
  .site-nav a{padding:.7rem .6rem;font-size:.95rem;border-bottom:1px solid rgba(36,49,69,.5)}
  .hero-stats{grid-template-columns:repeat(2,1fr)}
  .two-col,.company,.footer-grid{grid-template-columns:1fr}
  .faq-list{grid-template-columns:1fr}
  .card-grid{grid-template-columns:1fr}
  .card-wide{grid-column:auto}
  .post{padding:1.3rem}
  .section{padding:2.2rem 0}
  .chain{flex-direction:column}
  .chain li::after{transform:translate(-50%,0);right:auto;left:50%;top:auto;bottom:-1.05rem}
  .toc ol{columns:1}
  .layers{grid-template-columns:1fr}
}
@media (max-width:430px){
  .feature-grid{grid-template-columns:1fr}
  .hero-stats{grid-template-columns:1fr 1fr}
  .brand span{font-size:.95rem}
  .diagram-scroll img{min-width:520px}
}