@import url('https://fonts.googleapis.com/css2?family=Fredoka:wght@400;500;600;700&family=Nunito:wght@300;400;500;600;700&display=swap');

:root{
  --g:#00ff80;
  --b:#0000ff;
  --k:#000000;
  --w:#ffffff;
  --line:#2b2b2b;
  --mute:#a5a5a5;
}

*,*::before,*::after{box-sizing:border-box}

html{
  background:var(--k);
  scroll-behavior:smooth;
  -webkit-text-size-adjust:100%;
}

body{
  margin:0;
  background:var(--k);
  color:var(--w);
  font-family:'Nunito',system-ui,-apple-system,'Segoe UI',sans-serif;
  font-size:17px;
  line-height:1.65;
  font-weight:400;
  overflow-x:hidden;
}

h1,h2,h3,h4,.brand,.rail-link,.top-link,.hero-cta{
  font-family:'Fredoka','Nunito',system-ui,sans-serif;
  font-weight:700;
  line-height:1.15;
  letter-spacing:.005em;
}

p{margin:0 0 15px}
ul,ol{pargin:0;padding-left:22px;margin:0 0 16px}
li{margin:0 0 7px}
img{max-width:100%;height:auto;display:block}
strong{background:var(--g);color:var(--k);padding:0 4px}
a{color:inherit}
hr{border:0;border-top:4px solid var(--k);width:62px;margin:10px 0 18px}
::selection{background:var(--g);color:var(--k)}
:focus-visible{outline:4px solid var(--b);outline-offset:3px}

/* ---------- 页头：品牌居中，菜单分列两侧 ---------- */
.masthead{
  position:sticky;
  top:0;
  z-index:40;
  background:var(--k);
  border-bottom:4px solid var(--g);
}

.bar{
  display:flex;
  align-items:stretch;
  justify-content:space-between;
  gap:6px;
  max-width:1320px;
  margin:0 auto;
}

.rail{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:2px;
  flex:1 1 auto;
}
.rail--l{justify-content:flex-start}
.rail--r{justify-content:flex-end}

.rail-link{
  display:inline-flex;
  align-items:center;
  gap:8px;
  min-height:52px;
  padding:12px 10px;
  font-size:16px;
  text-decoration:none;
  color:var(--g);
  border-bottom:4px solid transparent;
}
.rail-link::before{
  content:'';
  width:9px;
  height:9px;
  background:var(--b);
  flex:0 0 auto;
}
.rail-link:nth-child(2n)::before{background:var(--g)}
.rail-link:nth-child(3n)::before{background:var(--w);border-radius:50%}
.rail-link:hover,
.rail-link:focus-visible{
  background:var(--g);
  color:var(--k);
  border-bottom-color:var(--b);
}
.rail-link:hover::before,
.rail-link:focus-visible::before{background:var(--k)}

.brand{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  padding:8px 18px;
  min-height:52px;
  font-size:22px;
  color:var(--k);
  background:var(--g);
  border-left:4px solid var(--k);
  border-right:4px solid var(--k);
  text-decoration:none;
  white-space:nowrap;
}
.brand img{max-height:34px;width:auto}

/* ---------- 主区 ---------- */
main{
  display:grid;
  grid-template-columns:minmax(0,1fr) 320px;
  gap:26px;
  align-content:start;
  max-width:1320px;
  margin:0 auto;
  padding:26px 20px 64px;
}

/* 首屏 */
.hero{
  grid-column:1 / -1;
  position:relative;
  isolation:isolate;
  overflow:hidden;
  min-height:70vh;
  display:flex;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  text-align:center;
  padding:66px 22px 132px;
  background:var(--g);
  color:var(--k);
  clip-path:polygon(0 0,100% 0,100% 88%,0 100%);
}
.hero > *:not(.hero-fig){position:relative;z-index:1}
.hero-fig{
  position:absolute;
  inset:0;
  margin:0;
  z-index:0;
  background:repeating-linear-gradient(45deg,var(--k) 0 2px,transparent 2px 13px);
}
.hero-fig img{
  width:100%;
  height:100%;
  object-fit:cover;
  filter:grayscale(1) contrast(1.25);
  mix-blend-mode:multiply;
  opacity:.5;
}
.hero::after{
  content:'';
  position:absolute;
  left:0;
  right:0;
  bottom:34px;
  height:16px;
  background:var(--b);
  transform:skewY(-1.4deg);
  z-index:0;
}
.hero h1{
  margin:0 0 18px;
  font-size:clamp(2.1rem,7.4vw,4.8rem);
  max-width:16ch;
  text-shadow:3px 3px 0 var(--w);
}
.hero-desc{
  max-width:44ch;
  margin:0 0 26px;
  font-size:clamp(1rem,2.3vw,1.2rem);
  font-weight:600;
  line-height:1.6;
}
.hero-cta{
  display:inline-flex;
  align-items:center;
  min-height:50px;
  padding:12px 30px;
  font-size:17px;
  text-decoration:none;
  color:var(--g);
  background:var(--k);
  border:4px solid var(--k);
  border-radius:10px;
}
.hero-cta:hover,
.hero-cta:focus-visible{background:var(--w);color:var(--k);border-color:var(--b)}

/* 正文区块 */
main > section:not(.hero){
  grid-column:1;
  background:var(--w);
  color:var(--k);
  border:4px solid var(--g);
  border-radius:10px;
  padding:26px 22px 30px;
  scroll-margin-top:104px;
  overflow-wrap:break-word;
}
main > section:not(.hero) h2{
  display:inline-block;
  margin:0;
  padding:4px 10px;
  font-size:clamp(1.35rem,3.2vw,1.9rem);
  background:var(--g);
  border:3px solid var(--k);
  border-radius:10px;
  scroll-margin-top:104px;
}
main > section:not(.hero) h3{
  margin:22px 0 8px;
  font-size:1.16rem;
}
main > section:not(.hero) a{
  color:var(--b);
  text-decoration:underline;
  text-decoration-thickness:2px;
  text-underline-offset:3px;
}
main > section:not(.hero) a:hover{background:var(--g);color:var(--k)}
main > section:not(.hero) blockquote{
  margin:0 0 16px;
  padding:10px 0 10px 16px;
  border-left:8px solid var(--b);
  font-weight:600;
}
main > section:not(.hero) table{
  width:100%;
  border-collapse:collapse;
  margin:0 0 18px;
  font-size:16px;
}
main > section:not(.hero) th,
main > section:not(.hero) td{
  border:3px solid var(--k);
  padding:8px 10px;
  text-align:left;
}
main > section:not(.hero) th{background:var(--g)}
main > section:not(.hero) figure{margin:0 0 18px}
main > section:not(.hero) code{
  font-family:ui-monospace,monospace;
  background:var(--k);
  color:var(--g);
  padding:1px 5px;
}

/* 右侧栏 */
.side{
  grid-column:2;
  grid-row:2 / span 7;
  align-self:start;
  position:sticky;
  top:104px;
  background:var(--b);
  color:var(--w);
  border:4px solid var(--g);
  border-radius:10px;
  padding:20px 16px 22px;
}
.side h2{
  margin:0;
  font-size:1.25rem;
  color:var(--g);
}
.side hr{border-top-color:var(--w);width:44px}
.side ol{
  list-style:none;
  margin:0;
  padding:0;
  counter-reset:s;
}
.side li{
  counter-increment:s;
  margin:0;
  border-bottom:2px solid rgba(255,255,255,.35);
}
.side li:last-child{border-bottom:0}
.side li a{
  display:flex;
  align-items:center;
  gap:10px;
  min-height:46px;
  padding:6px 4px;
  color:var(--w);
  font-weight:700;
  text-decoration:none;
}
.side li a::before{
  content:counter(s,decimal-leading-zero);
  font-family:'Fredoka',monospace;
  font-size:.92rem;
  color:var(--g);
}
.side li a:hover,
.side li a:focus-visible{background:var(--w);color:var(--b)}
.side li a:hover::before,
.side li a:focus-visible::before{color:var(--b)}

/* ---------- 页脚 ---------- */
.foot{
  background:var(--k);
  border-top:10px solid var(--g);
  padding:0 0 32px;
}
.foot > section{
  width:100%;
  max-width:1320px;
  margin:0 auto;
  padding-left:20px;
  padding-right:20px;
}
.foot-cta{padding-top:48px}
.foot-cta h2{
  margin:0 0 10px;
  font-size:clamp(2.2rem,9vw,5.6rem);
  line-height:.98;
  color:var(--g);
  word-break:break-word;
}
.foot-cta hr{
  border-top:8px solid var(--b);
  width:100%;
  margin:14px 0 24px;
}
.top-link{
  display:inline-flex;
  align-items:center;
  min-height:50px;
  padding:12px 26px;
  font-size:17px;
  text-decoration:none;
  color:var(--k);
  background:var(--g);
  border:4px solid var(--g);
  border-radius:10px;
}
.top-link:hover,
.top-link:focus-visible{background:var(--k);color:var(--g)}

.foot-nav{
  margin-top:38px;
  padding-top:22px;
  border-top:2px solid var(--line);
}
.foot-nav nav dl{
  display:grid;
  grid-auto-flow:column;
  grid-template-rows:auto auto;
  grid-template-columns:repeat(7,minmax(0,1fr));
  gap:0 16px;
  margin:0;
}
.foot-nav dt{
  font-weight:700;
  font-size:16px;
}
.foot-nav dt a{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  color:var(--w);
  text-decoration:none;
  border-bottom:3px solid transparent;
}
.foot-nav dt a:hover,
.foot-nav dt a:focus-visible{color:var(--g);border-bottom-color:var(--g)}
.foot-nav dd{
  margin:0 0 10px;
}
.foot-nav dd span{
  display:block;
  width:26px;
  height:5px;
  background:var(--g);
}

.foot-end{
  margin-top:26px;
  padding-top:18px;
  border-top:2px solid var(--line);
  text-align:center;
  color:var(--mute);
}
.foot-end p{margin:0;font-size:16px}

/* ---------- 滚动揭示 ---------- */
.rv{
  opacity:0;
  transform:translate3d(0,16px,0);
  transition:opacity .18s linear,transform .18s linear;
}
.rv.in{opacity:1;transform:none}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .rv{transition:none;opacity:1;transform:none}
}

/* ---------- 断点 ---------- */
@media (max-width:1080px){
  main{grid-template-columns:minmax(0,1fr) 270px}
}

@media (max-width:900px){
  main{
    grid-template-columns:minmax(0,1fr);
    padding:18px 14px 44px;
    gap:18px;
  }
  .side{
    grid-column:1;
    grid-row:auto;
    position:static;
  }
  .foot > section{padding-left:14px;padding-right:14px}
  .foot-nav nav dl{
    grid-auto-flow:row;
    grid-template-columns:repeat(2,minmax(0,1fr));
    grid-template-rows:auto;
  }
  .foot-nav dd{display:none}
  main > section:not(.hero){padding:22px 16px 26px}
}

@media (max-width:760px){
  .masthead{position:static}
  .bar{
    flex-direction:column;
    flex-wrap:wrap;
    align-items:stretch;
    gap:0;
  }
  .brand{
    order:-1;
    border-left:0;
    border-right:0;
    border-bottom:4px solid var(--k);
    justify-content:center;
    min-height:58px;
    font-size:21px;
  }
  .rail{justify-content:flex-start;gap:0}
  .rail-link{
    flex:1 1 auto;
    justify-content:center;
    min-height:46px;
    padding:10px 8px;
    border-bottom:2px solid #1d1d1d;
  }
  .hero{min-height:62vh;padding:52px 16px 108px}
  .hero-desc{max-width:32ch}
  main > section:not(.hero){scroll-margin-top:16px}
  main > section:not(.hero) h2{scroll-margin-top:16px}
}
</｜DSML｜ parameter>
</｜DSML｜ invoke>
</｜DSML｜ calls>

button[aria-expanded]{min-width:44px;min-height:44px}