@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500&family=Playfair+Display:ital,wght@0,400;0,700;0,900;1,400&family=Source+Serif+4:ital,wght@0,300;0,400;0,600;1,300&display=swap');

:root{
  --mint:#99ffcc;
  --neon:#00ff41;
  --ink:#001e3c;
  --ink-2:#00294e;
  --line:rgba(153,255,204,.34);
  --line-soft:rgba(153,255,204,.15);
  --dim:rgba(153,255,204,.78);
  --serif:'Playfair Display','Source Serif 4','Songti SC','Noto Serif SC',Georgia,serif;
  --bodyf:'Source Serif 4','Songti SC','Noto Serif SC',Georgia,serif;
  --mono:'JetBrains Mono',ui-monospace,SFMono-Regular,Menlo,monospace;
}

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

html{
  scroll-behavior:smooth;
  scroll-padding-top:104px;
  -webkit-text-size-adjust:100%;
}

body{
  margin:0;
  font:400 17px/1.75 var(--bodyf);
  color:var(--mint);
  background-color:var(--ink);
  background-image:
    radial-gradient(62vw 62vw at 6% -8%, rgba(0,255,65,.17), transparent 62%),
    radial-gradient(50vw 50vw at 98% 4%, rgba(153,255,204,.13), transparent 60%),
    radial-gradient(76vw 76vw at 46% 112%, rgba(0,255,65,.11), transparent 66%);
  background-attachment:fixed;
  background-repeat:no-repeat;
  overflow-x:hidden;
}

img{max-width:100%;height:auto}
a{color:var(--neon)}
:focus-visible{outline:2px solid var(--neon);outline-offset:3px}

/* ---------- 页头 ---------- */
.mast{
  position:sticky;
  top:0;
  z-index:60;
  display:grid;
  grid-template-columns:1fr auto 1fr;
  align-items:center;
  gap:10px;
  padding:9px clamp(12px,3vw,32px);
  background:rgba(0,30,60,.9);
  border-bottom:1px solid var(--line);
  backdrop-filter:blur(12px);
}

.mast__nav{display:flex;align-items:center;gap:4px;flex-wrap:wrap}
.mast__nav--l{justify-content:flex-end}
.mast__tail{display:flex;align-items:center;gap:10px;width:100%}

.nlink,.drop__sum{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:0 12px;
  font-family:var(--bodyf);
  font-size:16px;
  color:var(--mint);
  text-decoration:none;
  border:1px solid transparent;
  background:none;
  cursor:pointer;
}
.nlink:hover,.drop__sum:hover{border-color:var(--line);background:rgba(0,255,65,.1)}

.drop{position:relative}
.drop__sum{list-style:none;gap:7px}
.drop__sum::-webkit-details-marker{display:none}
.drop__sum::after{
  content:"";
  width:0;height:0;
  border:5px solid transparent;
  border-top-color:currentColor;
  transform:translateY(2px);
  transition:transform .2s ease;
}
.drop[open] .drop__sum::after{transform:rotate(180deg) translateY(-2px)}
.drop[open] .drop__sum{border-color:var(--neon);color:var(--neon)}

.drop__menu{
  position:absolute;
  top:calc(100% + 6px);
  left:0;
  z-index:80;
  min-width:184px;
  margin:0;
  padding:6px;
  list-style:none;
  display:grid;
  gap:2px;
  background:var(--ink-2);
  border:1px solid var(--line);
  animation:pop .22s ease both;
}
.drop__menu--r{left:auto;right:0}
.drop__menu a{
  display:flex;
  align-items:center;
  min-height:44px;
  padding:0 12px;
  font-size:16px;
  color:var(--mint);
  text-decoration:none;
  border:1px solid transparent;
}
.drop__menu a:hover{background:rgba(0,255,65,.13);border-color:var(--line)}

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

.brand{
  display:inline-flex;
  align-items:center;
  gap:9px;
  min-height:44px;
  padding:0 6px;
  color:var(--mint);
  text-decoration:none;
  font-family:var(--serif);
  font-weight:700;
  font-size:21px;
  letter-spacing:.05em;
  white-space:nowrap;
}
.brand__mark{
  width:19px;height:19px;
  background:radial-gradient(circle at 35% 30%, var(--neon), var(--mint) 70%);
  border-radius:60% 40% 55% 45% / 50% 60% 40% 50%;
  animation:breathe 7s ease-in-out infinite;
}
@keyframes breathe{
  0%,100%{transform:scale(1);border-radius:60% 40% 55% 45% / 50% 60% 40% 50%}
  50%{transform:scale(1.2);border-radius:44% 56% 40% 60% / 60% 42% 58% 40%}
}

.cta{
  margin-left:auto;
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:0 18px;
  font-family:var(--mono);
  font-size:16px;
  font-weight:500;
  letter-spacing:.05em;
  color:var(--ink);
  background:var(--neon);
  border:1px solid var(--neon);
  text-decoration:none;
  white-space:nowrap;
  transition:background .18s ease,color .18s ease;
}
.cta:hover{background:transparent;color:var(--neon)}

/* ---------- 骨架 ---------- */
.frame{
  display:grid;
  grid-template-columns:214px minmax(0,1fr);
  gap:clamp(20px,4vw,54px);
  max-width:1180px;
  margin:0 auto;
  padding:0 clamp(14px,3vw,32px);
}

.rail{
  position:sticky;
  top:104px;
  align-self:start;
  margin-top:clamp(26px,5vw,54px);
  padding:2px 0 2px 16px;
  border-left:2px solid var(--neon);
}
.rail__title{
  font-family:var(--serif);
  font-weight:700;
  font-size:22px;
  line-height:1.3;
  letter-spacing:.05em;
  margin:0 0 12px;
}
.rail__list{list-style:none;margin:0;padding:0;counter-reset:rail}
.rail__list li{counter-increment:rail}
.rail__list a{
  display:flex;
  align-items:center;
  gap:9px;
  min-height:42px;
  padding:6px 0;
  font-size:16px;
  line-height:1.4;
  color:var(--dim);
  text-decoration:none;
  border-bottom:1px solid var(--line-soft);
  transition:color .18s ease,padding .18s ease;
}
.rail__list a::before{
  content:counter(rail,decimal-leading-zero);
  font-family:var(--mono);
  font-size:13px;
  color:rgba(153,255,204,.5);
}
.rail__list a:hover,.rail__list a.is-on{color:var(--neon);padding-left:5px}
.rail__list a.is-on{border-bottom-color:var(--neon)}

.eyebrow{
  display:block;
  font-family:var(--mono);
  font-size:16px;
  letter-spacing:.16em;
  color:var(--neon);
  margin:0 0 8px;
}

/* ---------- 头部主角区 ---------- */
.hero{
  position:relative;
  overflow:hidden;
  min-height:70vh;
  display:flex;
  flex-direction:column;
  justify-content:center;
  padding:clamp(28px,5vw,58px) 0 clamp(32px,5vw,62px);
}
.hero__canvas{
  position:absolute;
  inset:0;
  width:100%;
  height:100%;
  opacity:.9;
  pointer-events:none;
}
.hero__num{
  position:absolute;
  top:-6px;
  right:-.05em;
  font-family:var(--serif);
  font-weight:900;
  font-size:clamp(120px,29vw,290px);
  line-height:.78;
  color:transparent;
  -webkit-text-stroke:1px rgba(153,255,204,.3);
  pointer-events:none;
  user-select:none;
  animation:drift 12s ease-in-out infinite;
}
@keyframes drift{0%,100%{transform:translateY(0)}50%{transform:translateY(-12px)}}

.hero__copy{position:relative;z-index:2}
.hero__h1{
  font-family:var(--serif);
  font-weight:900;
  font-size:clamp(32px,7vw,72px);
  line-height:1.06;
  letter-spacing:-.015em;
  margin:0 0 .45em;
  max-width:20ch;
  text-shadow:0 2px 26px rgba(0,30,60,.85);
}
.hero__desc{
  font-size:clamp(17px,2.1vw,20px);
  line-height:1.7;
  max-width:44ch;
  color:var(--dim);
  margin:0;
}

.hero__fig{
  position:relative;
  z-index:1;
  margin:clamp(24px,4vw,42px) 0 0;
  border:1px solid var(--line);
  min-height:196px;
  overflow:hidden;
  background:
    radial-gradient(38% 78% at 22% 32%, rgba(0,255,65,.24), transparent 68%),
    radial-gradient(46% 90% at 74% 62%, rgba(153,255,204,.18), transparent 70%),
    linear-gradient(150deg, var(--ink-2), var(--ink));
}
.hero__img{
  display:block;
  width:100%;
  height:100%;
  min-height:196px;
  max-height:46vh;
  object-fit:cover;
  filter:saturate(1.1) contrast(1.05);
}
.hero__fig figcaption{
  position:absolute;
  left:0;
  bottom:0;
  padding:5px 12px;
  font-family:var(--mono);
  font-size:16px;
  letter-spacing:.06em;
  color:var(--mint);
  background:rgba(0,30,60,.82);
  border-top:1px solid var(--line);
  border-right:1px solid var(--line);
}

/* ---------- 正文 ---------- */
.body{min-width:0}

main > article{
  position:relative;
  padding:clamp(34px,5.5vw,68px) 0;
  border-top:1px solid var(--line-soft);
  scroll-margin-top:108px;
}

main > article > small,
main .eyebrow{
  display:inline-block;
  font-family:var(--mono);
  font-size:16px;
  letter-spacing:.14em;
  color:var(--neon);
  border-left:2px solid var(--neon);
  padding-left:9px;
  margin:0 0 10px;
}

main h2{
  font-family:var(--serif);
  font-weight:800;
  font-size:clamp(25px,4.4vw,42px);
  line-height:1.16;
  letter-spacing:-.01em;
  margin:.1em 0 .65em;
  max-width:26ch;
}
main h3{
  font-family:var(--serif);
  font-weight:700;
  font-size:clamp(20px,2.8vw,26px);
  line-height:1.3;
  margin:1.5em 0 .5em;
  max-width:30ch;
}
main p{max-width:66ch;margin:0 0 1.05em}
main ul,main ol{max-width:66ch;padding-left:1.25em;margin:0 0 1.2em}
main li{margin:.4em 0}
main li::marker{color:var(--neon)}
main a{color:var(--neon);text-underline-offset:3px}
main strong{color:#fff;font-weight:600}
main img{display:block;border:1px solid var(--line);margin:1.2em 0}
main figure,main aside{
  margin:1.4em 0;
  padding:14px;
  border:1px solid var(--line);
  max-width:72ch;
  background:rgba(0,255,65,.05);
}
main figure img{margin:0 0 10px}
main figure figcaption{
  font-family:var(--mono);
  font-size:16px;
  line-height:1.6;
  color:var(--dim);
}
main blockquote{
  margin:1.5em 0;
  padding:14px 18px;
  max-width:66ch;
  border-left:3px solid var(--neon);
  background:rgba(0,255,65,.07);
}
main blockquote p:last-child{margin-bottom:0}
main table{
  width:100%;
  max-width:72ch;
  border-collapse:collapse;
  margin:1.4em 0;
  font-size:16px;
}
main th,main td{
  border:1px solid var(--line-soft);
  padding:10px 12px;
  text-align:left;
  vertical-align:top;
}
main th{color:var(--neon);font-family:var(--mono);font-weight:500}
main hr{border:none;border-top:1px solid var(--line-soft);margin:2em 0}

/* ---------- 页脚 ---------- */
.foot{
  margin-top:clamp(40px,7vw,76px);
  padding:26px 18px 42px;
  text-align:center;
  border-top:1px solid var(--line);
}
.foot p{
  margin:0 0 6px;
  font-family:var(--mono);
  font-size:16px;
  letter-spacing:.08em;
}
.foot small{
  display:block;
  font-size:16px;
  color:rgba(153,255,204,.6);
}

/* ---------- 出场 ---------- */
.rv-on .rv{
  opacity:0;
  transform:translateY(16px);
  transition:opacity .7s ease, transform .7s cubic-bezier(.2,.7,.2,1);
}
.rv-on .rv.in{opacity:1;transform:none}

/* ---------- 断点 ---------- */
@media (max-width:880px){
  .frame{grid-template-columns:1fr}
  .rail{
    position:static;
    margin:18px 0 0;
    padding:14px 0 0;
    border-left:none;
    border-top:1px solid var(--line-soft);
  }
  .rail__title{font-size:20px;margin-bottom:10px}
  .rail__list{display:flex;flex-wrap:wrap;gap:6px}
  .rail__list li{flex:0 1 auto}
  .rail__list a{
    min-height:44px;
    padding:0 10px;
    border:1px solid var(--line-soft);
    color:var(--mint);
  }
  .rail__list a:hover,.rail__list a.is-on{padding-left:10px;border-color:var(--neon)}
  .hero{min-height:auto;padding-top:clamp(18px,4vw,32px)}
  .hero__fig,.hero__img{min-height:170px;max-height:none}
}

@media (max-width:760px){
  .mast{display:flex;flex-wrap:wrap;gap:6px;padding:8px 12px}
  .brand{order:1;flex:1 0 100%;justify-content:center;font-size:20px}
  .mast__nav--l{order:2;justify-content:flex-start}
  .mast__tail{order:3;width:auto;flex:1 1 auto;justify-content:flex-end}
  .mast__nav--r{justify-content:flex-end}
  .nlink,.drop__sum{padding:0 10px}
  .cta{padding:0 14px}
  .drop__menu{min-width:168px}
  .hero__num{font-size:clamp(96px,32vw,180px);opacity:.85}
  main > article{padding:clamp(28px,7vw,44px) 0;scroll-margin-top:132px}
}

@media (max-width:400px){
  .nlink,.drop__sum{font-size:16px;padding:0 8px}
  .mast__nav{gap:2px}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *{animation-duration:.001ms !important;animation-iteration-count:1 !important;transition-duration:.001ms !important}
  .rv-on .rv{opacity:1;transform:none}
}

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