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

:root{
  --mint:#69ff69;
  --cyan:#00ffff;
  --ink:#172617;
  --bg:#08110b;
  --text:#dff8e6;
  --muted:#9ec9ae;
  --line:rgba(105,255,105,.24);
  --radius:18px;
  --chrome:linear-gradient(180deg,#f4fff8 0%,#b6ffd2 32%,#66e6d6 50%,#ffffff 58%,#8dffbe 74%,#e6fff0 100%);
}

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

html{
  scroll-behavior:smooth;
  -webkit-text-size-adjust:100%;
}

body{
  margin:0;
  color:var(--text);
  font-family:"Noto Sans SC",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  font-size:17.5px;
  line-height:1.78;
  font-weight:400;
  overflow-x:hidden;
  background-color:#08110b;
  background-image:
    radial-gradient(circle,rgba(105,255,105,.42) 0 1.2px,transparent 1.8px),
    radial-gradient(circle,rgba(0,255,255,.30) 0 1px,transparent 1.6px),
    radial-gradient(1100px 560px at 82% -8%,rgba(0,255,255,.16),transparent 62%),
    radial-gradient(880px 520px at 2% 18%,rgba(105,255,105,.13),transparent 62%),
    linear-gradient(180deg,#0a150e 0%,#0c1a11 55%,#08110b 100%);
  background-size:190px 176px,141px 149px,auto,auto,auto;
  background-position:0 0,40px 70px,0 0,0 0,0 0;
  background-repeat:repeat,repeat,no-repeat,no-repeat,no-repeat;
}

a{color:var(--mint)}
a:hover{color:var(--cyan)}
:focus-visible{outline:2px solid var(--cyan);outline-offset:2px;border-radius:8px}

.eyebrow{
  display:block;
  font-size:16px;
  line-height:1.5;
  letter-spacing:.26em;
  color:var(--cyan);
  margin:0 0 8px;
  text-shadow:0 0 12px rgba(0,255,255,.45);
}

/* 顶部导航 */
.topnav{
  position:sticky;
  top:0;
  z-index:60;
  display:grid;
  grid-template-columns:1fr auto 1fr auto;
  grid-template-areas:"l b r c";
  align-items:center;
  gap:10px;
  padding:10px clamp(14px,3vw,30px);
  background:rgba(8,17,11,.84);
  backdrop-filter:blur(14px) saturate(150%);
  -webkit-backdrop-filter:blur(14px) saturate(150%);
  border-bottom:1px solid var(--line);
}
.topnav::after{
  content:"";
  position:absolute;
  left:0;right:0;bottom:-1px;
  height:1px;
  background:linear-gradient(90deg,transparent,var(--cyan),var(--mint),transparent);
  opacity:.8;
}

.topnav ol{
  list-style:none;
  margin:0;
  padding:0;
  display:flex;
  align-items:center;
  gap:2px;
  flex-wrap:wrap;
}
.menu-left{grid-area:l;justify-self:end}
.menu-right{grid-area:r;justify-self:start}

.topnav .menu a{
  display:flex;
  align-items:center;
  min-height:44px;
  padding:8px 11px;
  font-size:16px;
  line-height:1.5;
  color:#cdeadb;
  text-decoration:none;
  border-radius:12px;
  transition:color .18s ease,background .18s ease;
}
.topnav .menu a:hover{
  color:#05130a;
  background:linear-gradient(180deg,#e6fff0,var(--mint));
}

.brand{
  grid-area:b;
  justify-self:center;
  display:inline-flex;
  align-items:center;
  gap:8px;
  min-height:44px;
  padding:6px 10px;
  font-size:17px;
  font-weight:700;
  letter-spacing:.05em;
  text-decoration:none;
  border-radius:12px;
}
.brand-mark{
  color:var(--cyan);
  text-shadow:0 0 14px rgba(0,255,255,.8);
  font-size:18px;
}
.brand-name{
  background:var(--chrome);
  -webkit-background-clip:text;
  background-clip:text;
  color:transparent;
  filter:drop-shadow(0 0 10px rgba(0,255,255,.35));
  white-space:nowrap;
}

.cta{
  grid-area:c;
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:8px 20px;
  font-size:16px;
  font-weight:700;
  color:#05130a;
  text-decoration:none;
  border-radius:999px;
  background:linear-gradient(180deg,#e9fff2 0%,#69ff69 52%,#17d6a8 100%);
  box-shadow:inset 0 1px 0 rgba(255,255,255,.9),inset 0 -2px 0 rgba(0,80,40,.35),0 8px 22px rgba(105,255,105,.3);
  transition:transform .16s ease,box-shadow .16s ease;
}
.cta:hover{color:#05130a;transform:translateY(-1px);box-shadow:inset 0 1px 0 rgba(255,255,255,.9),0 12px 26px rgba(105,255,105,.45)}

.nav-toggle{
  display:none;
  grid-area:t;
  align-items:center;
  min-height:44px;
  padding:8px 16px;
  font-family:inherit;
  font-size:16px;
  font-weight:500;
  color:#eafff2;
  background:rgba(105,255,105,.1);
  border:1px solid var(--line);
  border-radius:999px;
  cursor:pointer;
}

/* 首屏 */
.hero{
  position:relative;
  isolation:isolate;
  overflow:hidden;
  display:grid;
  place-items:center;
  min-height:100vh;
  min-height:100svh;
  padding:72px 20px 118px;
  text-align:center;
  clip-path:polygon(0 0,100% 0,100% calc(100% - 62px),0 100%);
  background:radial-gradient(circle at 76% 26%,rgba(0,255,255,.28),transparent 58%),radial-gradient(circle at 20% 74%,rgba(105,255,105,.24),transparent 58%),#0a1a10;
}
.hero-media{
  position:absolute;
  inset:0;
  margin:0;
  z-index:-2;
}
.hero-media img{
  width:100%;
  height:100%;
  object-fit:cover;
  display:block;
}
.hero::before{
  content:"";
  position:absolute;
  inset:0;
  z-index:-1;
  background:linear-gradient(180deg,rgba(8,17,11,.74),rgba(8,17,11,.9) 70%,rgba(8,17,11,.96));
}

.hero-copy{max-width:860px}
.hero-copy > *{animation:rise .78s cubic-bezier(.2,.72,.3,1) both}
.hero-copy > *:nth-child(2){animation-delay:.09s}
.hero-copy > *:nth-child(3){animation-delay:.17s}
.hero-copy > *:nth-child(4){animation-delay:.25s}

@keyframes rise{from{opacity:0;transform:translateY(26px)}to{opacity:1;transform:none}}

.hero-copy h1{
  margin:.2em 0 .45em;
  font-size:clamp(2rem,6.2vw,4.1rem);
  line-height:1.22;
  font-weight:700;
  letter-spacing:.01em;
  background:var(--chrome);
  -webkit-background-clip:text;
  background-clip:text;
  color:transparent;
  filter:drop-shadow(0 0 22px rgba(0,255,255,.42));
}

.hero-desc{
  margin:0 auto 30px;
  max-width:34em;
  color:var(--muted);
  font-size:17.5px;
}

.hero-cta{
  display:inline-flex;
  align-items:center;
  min-height:48px;
  padding:10px 32px;
  font-size:17px;
  font-weight:700;
  color:#05130a;
  text-decoration:none;
  border-radius:999px;
  background:linear-gradient(180deg,#f4fff8 0%,#69ff69 48%,#00ffff 100%);
  box-shadow:inset 0 1px 0 rgba(255,255,255,.95),0 0 0 1px rgba(255,255,255,.35),0 10px 30px rgba(0,255,255,.34);
  transition:transform .16s ease,box-shadow .16s ease;
}
.hero-cta:hover{color:#05130a;transform:translateY(-2px);box-shadow:inset 0 1px 0 #fff,0 14px 34px rgba(0,255,255,.5)}

/* 正文骨架 */
.shell{
  display:grid;
  grid-template-columns:252px minmax(0,1fr);
  gap:clamp(20px,3vw,46px);
  max-width:1200px;
  margin:0 auto;
  padding:clamp(44px,6vw,76px) clamp(16px,3vw,32px) 84px;
  align-items:start;
}

.rail{
  position:sticky;
  top:86px;
  padding:20px 18px 22px;
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:linear-gradient(180deg,rgba(105,255,105,.11),rgba(0,255,255,.06));
  box-shadow:0 18px 40px rgba(0,0,0,.34),inset 0 1px 0 rgba(255,255,255,.12);
}
.rail-title{
  margin:0 0 14px;
  font-size:19px;
  line-height:1.4;
  font-weight:700;
  color:#f2fff6;
}

.toc{
  list-style:none;
  margin:0;
  padding:0;
  display:grid;
  gap:2px;
}
.toc a{
  display:flex;
  align-items:center;
  min-height:42px;
  padding:8px 10px;
  font-size:16px;
  line-height:1.5;
  color:#cdeadb;
  text-decoration:none;
  border-left:2px solid transparent;
  border-radius:10px;
  transition:background .18s ease,border-color .18s ease,color .18s ease;
}
.toc a:hover{
  color:#eafff2;
  background:rgba(0,255,255,.1);
  border-left-color:var(--cyan);
}

.prose{max-width:768px;min-width:0}
.prose > section{
  position:relative;
  margin:0 0 26px;
  padding:28px 24px 34px;
  border:1px solid rgba(105,255,105,.2);
  border-radius:var(--radius);
  background:linear-gradient(180deg,rgba(105,255,105,.075),rgba(0,255,255,.035));
  box-shadow:0 20px 44px rgba(0,0,0,.28),inset 0 1px 0 rgba(255,255,255,.08);
  scroll-margin-top:96px;
}
.prose > section::after{
  content:"";
  position:absolute;
  left:24px;
  right:24px;
  bottom:0;
  height:3px;
  border-radius:3px;
  background:linear-gradient(90deg,var(--mint),var(--cyan));
  opacity:.9;
}
.prose > section:last-child{margin-bottom:0}

.prose h2{
  margin:.15em 0 .6em;
  font-size:clamp(1.35rem,3.4vw,1.92rem);
  line-height:1.34;
  font-weight:700;
  color:#f4fff8;
  text-shadow:0 0 20px rgba(105,255,105,.36);
}
.prose h3{
  margin:1.3em 0 .5em;
  font-size:1.14rem;
  line-height:1.4;
  color:#e9fff1;
}
.prose small{
  display:block;
  font-size:16px;
  line-height:1.5;
  letter-spacing:.22em;
  color:var(--cyan);
  margin-bottom:4px;
}
.prose p{margin:0 0 1em}
.prose ul,.prose ol{margin:0 0 1.1em;padding-left:1.35em}
.prose li{margin:0 0 .45em}
.prose strong{color:#eaffef;font-weight:700}
.prose blockquote{
  margin:1.2em 0;
  padding:14px 18px;
  border-left:3px solid var(--cyan);
  border-radius:0 12px 12px 0;
  background:rgba(0,255,255,.07);
  color:#dff8e6;
}
.prose img{max-width:100%;height:auto;border-radius:14px}
.prose a{color:var(--cyan);text-underline-offset:3px}

/* 滚动显现 */
.js .rev{opacity:0;transform:translateY(22px)}
.js .rev-in{
  opacity:1;
  transform:none;
  transition:opacity .62s ease,transform .62s cubic-bezier(.2,.72,.3,1);
  transition-delay:calc(var(--i,0) * 70ms);
}

/* 页脚 */
.site-foot{
  margin-top:20px;
  border-top:1px solid var(--line);
  background:linear-gradient(180deg,rgba(0,255,255,.08),rgba(8,17,11,.94));
  padding:52px 0 24px;
}
.foot-in{
  max-width:1200px;
  margin:0 auto;
  padding:0 clamp(16px,3vw,32px);
}
.foot-top{
  display:grid;
  grid-template-columns:minmax(0,1fr) minmax(0,1.15fr);
  gap:24px;
  align-items:end;
  padding-bottom:26px;
  border-bottom:1px dashed rgba(105,255,105,.22);
}
.foot-lead{
  margin:0;
  max-width:34ch;
  color:var(--muted);
  font-size:16px;
  line-height:1.7;
}
.foot-giant{
  margin:0;
  font-size:clamp(2.3rem,7.6vw,5.2rem);
  line-height:1.04;
  font-weight:700;
  letter-spacing:-.01em;
  word-break:break-word;
  background:var(--chrome);
  -webkit-background-clip:text;
  background-clip:text;
  color:transparent;
  filter:drop-shadow(0 0 20px rgba(0,255,255,.3));
}
.foot-cols{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:22px;
  padding:30px 0;
}
.foot-cols dl{margin:0}
.foot-cols dt{
  margin-bottom:8px;
  font-size:16px;
  letter-spacing:.2em;
  color:var(--cyan);
}
.foot-cols dd{
  margin:0;
  font-size:16px;
  line-height:1.6;
  color:var(--muted);
}
.foot-cols a{
  display:inline-flex;
  align-items:center;
  min-height:40px;
  color:#cdeadb;
  text-decoration:none;
  font-size:16px;
}
.foot-cols a:hover{color:var(--mint);text-decoration:underline}
.foot-base{
  margin:0;
  padding-top:18px;
  border-top:1px solid rgba(105,255,105,.16);
  text-align:center;
  font-size:16px;
  color:var(--muted);
}

/* 平板 */
@media (max-width:1080px){
  .topnav .menu a{padding:8px 9px;font-size:16px}
  .brand{font-size:16px}
}

/* 移动端 */
@media (max-width:900px){
  .topnav{
    grid-template-columns:1fr auto;
    grid-template-areas:"b t";
    padding:8px 14px;
  }
  .brand{justify-self:start}
  .nav-toggle{display:inline-flex}
  .topnav .menu,
  .topnav .cta{display:none}

  .topnav.open{grid-template-areas:"b t" "l l" "r r" "c c"}
  .topnav.open .menu{
    display:grid;
    grid-auto-rows:minmax(44px,auto);
    justify-self:stretch;
    gap:2px;
  }
  .topnav.open .menu-left{grid-area:l}
  .topnav.open .menu-right{grid-area:r}
  .topnav.open .cta{display:inline-flex;grid-area:c;justify-self:start;margin:6px 0 10px}

  .shell{grid-template-columns:minmax(0,1fr);padding-top:34px}
  .rail{position:static}
  .prose{max-width:none}
  .hero{padding:56px 18px 100px}
}

@media (max-width:760px){
  .foot-top{grid-template-columns:minmax(0,1fr)}
  .foot-cols{grid-template-columns:minmax(0,1fr);gap:16px}
}

@media (max-width:420px){
  .prose > section{padding:24px 18px 30px}
  .prose > section::after{left:18px;right:18px}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .hero-copy > *{animation:none}
  .js .rev{opacity:1;transform:none}
  .js .rev-in{transition:none}
  .cta,.hero-cta{transition:none}
}

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