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

:root{
  --deep:#001e3c;
  --deep2:#002b52;
  --mint:#99ffcc;
  --lime:#00ff41;
  --paper:#eafff5;
  --soft:rgba(153,255,204,.1);
  --line:rgba(153,255,204,.18);
  --r:10px;
}

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

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

body{
  margin:0;
  font-family:'Plus Jakarta Sans',system-ui,-apple-system,'Segoe UI','PingFang SC','Microsoft YaHei',sans-serif;
  font-size:17px;
  line-height:1.75;
  font-weight:400;
  color:var(--paper);
  background:transparent;
  overflow-x:hidden;
}

body::before{
  content:"";
  position:fixed;
  inset:-22vmax;
  z-index:-1;
  pointer-events:none;
  background:
    radial-gradient(38vmax 38vmax at 16% 20%, rgba(0,255,65,.20), transparent 62%),
    radial-gradient(46vmax 46vmax at 84% 10%, rgba(153,255,204,.16), transparent 64%),
    radial-gradient(52vmax 42vmax at 62% 92%, rgba(0,255,65,.12), transparent 66%);
  filter:blur(12px);
  animation:drift 24s ease-in-out infinite alternate;
}

@keyframes drift{
  from{transform:translate3d(-2%,-1%,0) scale(1)}
  to{transform:translate3d(3%,2%,0) scale(1.09)}
}

a{color:inherit}
img{max-width:100%;height:auto}

h1,h2,h3,h4{line-height:1.25;margin:0 0 .5em;font-weight:700}

/* ---------- 顶部 mast ---------- */
.mast{position:relative;z-index:25}

.mastbar{
  display:grid;
  grid-template-columns:minmax(0,1fr) auto minmax(0,1fr);
  align-items:center;
  gap:12px;
  padding:10px 16px;
  background:rgba(0,30,60,.72);
  border-bottom:1px solid var(--line);
  backdrop-filter:blur(10px);
}

.mastbar > .tuck:last-child{justify-self:end}

.brand{
  text-decoration:none;
  font-size:19px;
  font-weight:700;
  letter-spacing:.04em;
  white-space:nowrap;
  padding:6px 2px;
  background:linear-gradient(92deg,var(--mint),var(--lime));
  -webkit-background-clip:text;
  background-clip:text;
  -webkit-text-fill-color:transparent;
}

.tuck{position:relative;min-width:0}

.tuck > summary{
  list-style:none;
  display:inline-flex;
  align-items:center;
  gap:9px;
  min-height:44px;
  padding:8px 15px;
  border-radius:999px;
  background:var(--soft);
  color:var(--mint);
  font-size:16px;
  font-weight:600;
  cursor:pointer;
  user-select:none;
  transition:background .25s ease,color .25s ease;
}

.tuck > summary::-webkit-details-marker{display:none}
.tuck > summary:hover{background:rgba(0,255,65,.16);color:var(--lime)}
.tuck[open] > summary{background:rgba(0,255,65,.2);color:var(--lime)}

.sum-ic{
  flex:0 0 auto;
  width:13px;
  height:13px;
  border-radius:50%;
  background:var(--lime);
  box-shadow:0 0 0 4px rgba(0,255,65,.15);
  transition:transform .3s ease;
}

.tuck[open] > summary .sum-ic{transform:scale(1.45)}

.tuck > menu{
  position:absolute;
  top:calc(100% + 9px);
  left:0;
  z-index:40;
  min-width:236px;
  margin:0;
  padding:10px;
  list-style:none;
  display:flex;
  flex-direction:column;
  gap:2px;
  background:var(--deep2);
  border-radius:14px;
  box-shadow:0 20px 44px rgba(0,10,26,.6);
  animation:pop .24s ease both;
}

.mastbar > .tuck:last-child > menu{left:auto;right:0}

@keyframes pop{
  from{opacity:0;transform:translateY(-6px) scale(.98)}
  to{opacity:1;transform:none}
}

.tuck > menu li{list-style:none}

.tuck > menu a{
  display:flex;
  align-items:center;
  gap:10px;
  min-height:42px;
  padding:8px 12px;
  border-radius:9px;
  color:var(--paper);
  font-size:16px;
  text-decoration:none;
  transition:background .2s ease,color .2s ease,transform .2s ease;
}

.tuck > menu a:hover{
  background:rgba(0,255,65,.16);
  color:var(--lime);
  transform:translateX(3px);
}

.ic{
  flex:0 0 auto;
  width:9px;
  height:9px;
  border-radius:50%;
  background:var(--mint);
  opacity:.55;
}

.tuck > menu a:hover .ic{background:var(--lime);opacity:1}

/* ---------- 粘性锚点条 ---------- */
.stripes{
  position:sticky;
  top:0;
  z-index:22;
  display:flex;
  gap:8px;
  overflow-x:auto;
  padding:10px 16px;
  background:rgba(0,20,42,.9);
  border-bottom:1px solid var(--line);
  backdrop-filter:blur(12px);
  scrollbar-width:none;
}

.stripes::-webkit-scrollbar{display:none}

.stripes a{
  flex:0 0 auto;
  display:flex;
  align-items:center;
  min-height:40px;
  padding:0 15px;
  border-radius:999px;
  background:var(--soft);
  color:var(--mint);
  font-size:16px;
  font-weight:500;
  text-decoration:none;
  transition:background .2s ease,color .2s ease,transform .2s ease;
}

.stripes a:hover{
  background:rgba(0,255,65,.22);
  color:var(--lime);
  transform:translateY(-1px);
}

/* ---------- hero ---------- */
.hero{
  position:relative;
  overflow:hidden;
  min-height:45vh;
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:flex-end;
  gap:24px;
  padding:32px 20px 54px;
}

.hero-art{
  order:1;
  flex:0 0 auto;
  width:100px;
  height:100px;
}

.hero-art svg{display:block;width:100%;height:100%}

.cell-body{transform-origin:52px 52px;animation:breathe 6.5s ease-in-out infinite}
.cell-halo{transform-origin:52px 52px;animation:breathe 8.5s ease-in-out infinite reverse}

@keyframes breathe{
  0%,100%{transform:scale(1)}
  50%{transform:scale(1.1)}
}

.hero-copy{
  order:2;
  flex:1 1 260px;
  max-width:660px;
  text-align:right;
}

.hero-copy h1{
  margin:0 0 10px;
  font-size:clamp(1.85rem,6vw,3.3rem);
  line-height:1.15;
  letter-spacing:-.01em;
  color:var(--mint);
}

.hero-copy p{
  margin:0;
  font-size:16px;
  line-height:1.7;
  color:rgba(234,255,245,.78);
}

.hero::after{
  content:"";
  position:absolute;
  left:0;
  right:0;
  bottom:0;
  height:18px;
  background:linear-gradient(90deg,var(--lime),var(--mint) 58%,transparent);
  clip-path:polygon(0 100%,100% 0,100% 100%);
}

/* ---------- 主体 ---------- */
.scene{
  display:grid;
  grid-template-columns:250px minmax(0,1fr);
  gap:26px;
  align-items:start;
  max-width:1180px;
  margin:0 auto;
  padding:8px 20px 66px;
}

.rail{
  position:sticky;
  top:70px;
  padding:18px 16px;
  border-radius:var(--r);
  background:rgba(153,255,204,.08);
  font-size:16px;
}

.rail small{
  display:block;
  margin-bottom:5px;
  font-size:15px;
  letter-spacing:.22em;
  color:var(--lime);
}

.rail h3{
  margin:0 0 12px;
  font-size:17px;
  color:var(--mint);
}

.rail ul{
  margin:0;
  padding:0;
  list-style:none;
  display:flex;
  flex-direction:column;
  gap:2px;
}

.rail a{
  display:flex;
  align-items:center;
  min-height:40px;
  padding:6px 10px;
  border-radius:8px;
  color:rgba(234,255,245,.86);
  text-decoration:none;
  font-size:16px;
  transition:background .2s ease,color .2s ease;
}

.rail a:hover{background:rgba(0,255,65,.18);color:var(--lime)}

.sheet{min-width:0}

.sheet > section{
  padding:26px 0 30px;
  border-bottom:1px solid rgba(153,255,204,.13);
  scroll-margin-top:74px;
}

.sheet > section:last-child{border-bottom:0}

.sheet small{
  display:block;
  margin-bottom:6px;
  font-size:15px;
  letter-spacing:.18em;
  color:var(--lime);
}

.sheet h2{
  margin:0 0 14px;
  font-size:clamp(1.35rem,3.4vw,1.85rem);
  color:var(--mint);
}

.sheet h3{font-size:1.12rem;color:var(--mint);margin-top:1.4em}
.sheet p{margin:0 0 1em}
.sheet ul,.sheet ol{margin:0 0 1em;padding-left:1.35em}
.sheet li{margin:.35em 0}

.sheet a{
  color:var(--lime);
  text-underline-offset:3px;
  text-decoration-color:rgba(0,255,65,.45);
}

.sheet img{display:block;margin:16px 0;border-radius:var(--r)}
.sheet figure{margin:16px 0}

.sheet blockquote{
  margin:18px 0;
  padding:14px 18px;
  border-left:3px solid var(--lime);
  border-radius:0 var(--r) var(--r) 0;
  background:rgba(0,255,65,.08);
}

.sheet table{width:100%;border-collapse:collapse;font-size:16px}
.sheet th,.sheet td{padding:9px 10px;text-align:left;border-bottom:1px solid var(--line)}

/* reveal */
.js .sheet > section{
  opacity:0;
  transform:translateY(16px);
  transition:opacity .6s ease,transform .6s ease;
}

.js .sheet > section.in{opacity:1;transform:none}

/* ---------- 页脚 ---------- */
.foot{
  display:grid;
  grid-template-columns:1.5fr 1fr 1fr;
  gap:26px;
  padding:44px clamp(18px,7vw,88px) 0;
  background:rgba(0,15,32,.62);
  border-top:1px solid var(--line);
}

.giant{
  margin:0;
  font-size:clamp(1.9rem,6.4vw,4.4rem);
  line-height:.96;
  letter-spacing:-.02em;
  overflow-wrap:anywhere;
  background:linear-gradient(120deg,var(--mint),var(--lime));
  -webkit-background-clip:text;
  background-clip:text;
  -webkit-text-fill-color:transparent;
}

.foot .cap{
  margin:0 0 8px;
  font-size:15px;
  letter-spacing:.22em;
  color:var(--lime);
}

.foot ul{margin:0;padding:0;list-style:none;display:flex;flex-direction:column;gap:2px}

.foot li a{
  display:flex;
  align-items:center;
  min-height:40px;
  padding:4px 0;
  font-size:16px;
  color:rgba(234,255,245,.85);
  text-decoration:none;
  transition:color .2s ease,transform .2s ease;
}

.foot li a:hover{color:var(--lime);transform:translateX(3px)}

.base{
  grid-column:1/-1;
  display:flex;
  flex-wrap:wrap;
  justify-content:space-between;
  align-items:center;
  gap:12px;
  margin-top:26px;
  padding:14px 0 24px;
  border-top:1px solid var(--line);
  font-size:16px;
  color:rgba(234,255,245,.68);
}

.base a{
  display:inline-flex;
  align-items:center;
  min-height:40px;
  padding:0 4px;
  color:var(--mint);
  text-decoration:none;
}

.base a:hover{color:var(--lime)}

/* ---------- 断点 ---------- */
@media (max-width:880px){
  .scene{
    grid-template-columns:minmax(0,1fr);
    padding:8px 16px 56px;
    gap:18px;
  }
  .rail{position:static}
  .rail ul{flex-direction:row;flex-wrap:wrap;gap:6px}
  .rail li{flex:0 0 auto}
  .rail a{background:var(--soft);border-radius:999px;padding:6px 13px}
  .foot{grid-template-columns:1fr 1fr}
  .foot > section:first-child{grid-column:1/-1}
  .hero{justify-content:flex-start;min-height:0;padding:26px 16px 46px}
  .hero-copy{text-align:right}
}

@media (max-width:540px){
  body{font-size:16px}
  .brand{font-size:17px}
  .tuck > summary{padding:8px 12px}
  .hero-art{width:80px;height:80px}
  .giant{font-size:2.1rem}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms!important;
    animation-iteration-count:1!important;
    transition-duration:.001ms!important;
  }
  .js .sheet > section{opacity:1;transform:none}
}

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