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

:root{
  --bg:#000000;
  --card:#121212;
  --line:#1b1b1b;
  --line2:#2b2b2b;
  --ink:#e8e8e8;
  --dim:#9a9a9a;
  --neon:#6ef3c0;
  --violet:#9a8cff;
  --gold:#f3cf7a;
  --ff:"Nunito Sans","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --fh:"Varela Round","Nunito Sans","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
}

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

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

body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font-family:var(--ff);
  font-size:17px;
  line-height:1.7;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}

img{max-width:100%}
a{color:inherit;text-decoration:none}
h1,h2,h3,h4{font-family:var(--fh);font-weight:400;letter-spacing:.02em}
p{margin:0}

:focus-visible{outline:2px solid var(--neon);outline-offset:3px}

/* ---------- 顶部细条 ---------- */
.topline{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  align-items:center;
  padding:7px 18px;
  background:#050505;
  border-bottom:1px solid #141414;
  color:#8d8d8d;
  font-size:13px;
  letter-spacing:.16em;
}
.topline span+span::before{content:"·";margin-right:8px;color:#3b3b3b}

/* ---------- 粘性头部 ---------- */
.stick{position:sticky;top:0;z-index:60}

.masthead{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:14px;
  padding:9px 16px;
  background:rgba(0,0,0,.92);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}

.brand{
  display:inline-flex;
  align-items:center;
  gap:10px;
  min-height:44px;
  padding:6px 2px;
  font-family:var(--fh);
  font-size:20px;
  letter-spacing:.06em;
  color:#fff;
  text-shadow:0 0 14px rgba(110,243,192,.35);
}
.brand img{width:28px;height:28px;display:block}

.navd{position:relative}
.navd>summary{
  list-style:none;
  cursor:pointer;
  display:inline-flex;
  align-items:center;
  gap:9px;
  min-height:44px;
  padding:0 15px;
  border:1px solid var(--line2);
  font-family:var(--fh);
  font-size:15px;
  letter-spacing:.14em;
  color:#e2e2e2;
  transition:border-color .25s,color .25s;
}
.navd>summary::-webkit-details-marker{display:none}
.navd>summary::after{
  content:"";
  width:6px;height:6px;
  border-right:1px solid var(--neon);
  border-bottom:1px solid var(--neon);
  transform:rotate(45deg);
  transition:transform .25s;
}
.navd[open]>summary{border-color:var(--neon);color:#fff}
.navd[open]>summary::after{transform:rotate(-135deg)}

.navmenu{
  list-style:none;
  margin:8px 0 0;
  padding:8px;
  position:absolute;
  right:0;
  top:100%;
  min-width:230px;
  max-width:calc(100vw - 24px);
  background:#0b0b0b;
  border:1px solid var(--line2);
  box-shadow:0 18px 44px rgba(0,0,0,.9);
  display:grid;
  gap:2px;
}
.navmenu li a{
  display:flex;
  align-items:center;
  min-height:44px;
  padding:10px 14px;
  font-size:15px;
  color:#cfcfcf;
  border-left:2px solid transparent;
  transition:color .22s,background .22s,padding-left .22s,border-color .22s;
}
.navmenu li a:hover,
.navmenu li a:focus-visible{
  color:#fff;
  background:#151515;
  border-left-color:var(--neon);
  padding-left:19px;
}

/* ---------- 二级锚点条 ---------- */
.anchorrail{
  display:flex;
  overflow-x:auto;
  background:#080808;
  border-bottom:1px solid #171717;
  scrollbar-width:none;
}
.anchorrail::-webkit-scrollbar{display:none}
.anchorrail a{
  flex:0 0 auto;
  display:flex;
  align-items:center;
  min-height:44px;
  padding:0 14px;
  font-size:14px;
  letter-spacing:.06em;
  color:#8f8f8f;
  white-space:nowrap;
  border-right:1px solid #131313;
  transition:color .2s,background .2s;
}
.anchorrail a:hover,
.anchorrail a:focus-visible{color:#000;background:var(--neon)}

/* ---------- Hero ---------- */
.hero{
  position:relative;
  overflow:hidden;
  display:flex;
  align-items:flex-end;
  min-height:45vh;
  background:
    radial-gradient(130% 130% at 88% -10%,#0c1a16 0%,#000 62%),
    #000;
  clip-path:polygon(0 0,100% 0,100% 90%,0 100%);
}
.heroFig{position:absolute;inset:0;margin:0}
.heroFig img{
  width:100%;
  height:100%;
  object-fit:cover;
  filter:brightness(.48) contrast(1.06);
}
.hero::after{
  content:"";
  position:absolute;
  inset:0;
  background:linear-gradient(180deg,rgba(0,0,0,.62) 0%,rgba(0,0,0,.22) 46%,rgba(0,0,0,.94) 100%);
}
.heroGiant{
  position:absolute;
  right:clamp(8px,3vw,38px);
  bottom:-.14em;
  z-index:1;
  font-family:var(--fh);
  font-size:clamp(64px,15vw,170px);
  line-height:.8;
  letter-spacing:.02em;
  color:transparent;
  -webkit-text-stroke:1px rgba(255,255,255,.15);
  pointer-events:none;
  white-space:nowrap;
}
.heroIn{
  position:relative;
  z-index:2;
  width:100%;
  max-width:860px;
  padding:clamp(38px,8vw,78px) clamp(18px,4vw,44px) clamp(54px,9vw,88px);
}
.heroIn h1{
  margin:0;
  font-size:clamp(27px,4.4vw,50px);
  line-height:1.2;
  color:#fff;
  text-shadow:0 0 22px rgba(110,243,192,.32);
}
.heroSub{
  margin-top:14px;
  max-width:58ch;
  color:#bdbdbd;
  font-size:16px;
}

/* ---------- 主体栅格 ---------- */
main{display:block}
main [id]{scroll-margin-top:126px}

.wrap{
  max-width:1200px;
  margin:0 auto;
  padding:clamp(28px,4vw,54px) clamp(16px,3vw,32px) clamp(46px,7vw,80px);
  display:grid;
  grid-template-columns:1fr;
  gap:34px;
}
.wrap>section{order:1;min-width:0}
.wrap>aside{order:2}

/* ---------- 左侧目录 ---------- */
aside{
  background:#0a0a0a;
  border:1px solid #1a1a1a;
  box-shadow:0 16px 36px rgba(0,0,0,.72);
  padding:18px 16px;
}
aside h2{
  margin:0 0 12px;
  font-size:16px;
  letter-spacing:.2em;
  color:var(--neon);
  text-shadow:0 0 12px rgba(110,243,192,.45);
}
aside h2 span{
  display:inline-block;
  position:relative;
  padding-bottom:8px;
}
aside h2 span::after{
  content:"";
  position:absolute;
  left:0;bottom:0;
  width:26px;height:1px;
  background:var(--neon);
  box-shadow:0 0 8px rgba(110,243,192,.8);
}
aside ol{
  list-style:none;
  margin:0;
  padding:0;
  counter-reset:navc;
}
aside li{
  counter-increment:navc;
  border-bottom:1px solid #151515;
}
aside li:last-child{border-bottom:0}
aside li a{
  display:flex;
  align-items:center;
  gap:12px;
  min-height:44px;
  padding:6px 2px;
  font-size:16px;
  color:#bcbcbc;
  transition:color .2s,padding-left .2s;
}
aside li a::before{
  content:counter(navc,decimal-leading-zero);
  font-family:var(--fh);
  font-size:12px;
  letter-spacing:.1em;
  color:#5c5c5c;
  transition:color .2s;
}
aside li a:hover,
aside li a:focus-visible{color:#fff;padding-left:7px}
aside li a:hover::before,
aside li a:focus-visible::before{color:var(--neon)}

/* ---------- 正文 ---------- */
div{font-size:17px;color:#d3d3d3}
div section{
  border-top:1px solid #161616;
  margin-top:clamp(30px,4vw,46px);
  padding-top:clamp(22px,3vw,34px);
}
div section:first-child{border-top:0;margin-top:0;padding-top:0}

div h2{
  margin:0 0 16px;
  font-size:clamp(22px,2.8vw,30px);
  line-height:1.3;
  color:#fff;
}
div h2 span{
  display:inline-block;
  position:relative;
  padding-bottom:10px;
}
div h2 span::after{
  content:"";
  position:absolute;
  left:0;bottom:0;
  width:38px;height:2px;
  background:var(--neon);
  box-shadow:0 0 10px rgba(110,243,192,.7);
}
div h3{
  margin:26px 0 12px;
  font-size:20px;
  line-height:1.4;
  color:#f0f0f0;
}
div h3 span{display:inline-block;padding-bottom:6px;border-bottom:1px solid #2b2b2b}
div h4{margin:22px 0 10px;font-size:18px;color:#eaeaea}

div p{margin:0 0 1.05em;max-width:70ch}
div ul,div ol{margin:0 0 1.1em;padding-left:1.25em}
div li{margin-bottom:.5em}
div strong{color:#fff}
div a{
  color:var(--neon);
  text-decoration:underline;
  text-underline-offset:3px;
  text-decoration-thickness:1px;
}
div a:hover{color:#fff;text-shadow:0 0 10px rgba(110,243,192,.6)}
div blockquote{
  margin:1.5em 0;
  padding:14px 18px;
  background:#0b0b0b;
  border-left:2px solid var(--violet);
  color:#bdbdbd;
}
div blockquote p:last-child{margin-bottom:0}
div code{
  font-family:ui-monospace,SFMono-Regular,Menlo,monospace;
  font-size:.92em;
  background:#141414;
  padding:2px 6px;
  color:#8ff0c9;
}
div pre{
  background:#111;
  border:1px solid #202020;
  padding:14px;
  overflow-x:auto;
}
div pre code{background:none;padding:0}
div img{display:block;height:auto;margin:1.4em 0;border:1px solid #1e1e1e}
div figure{margin:1.4em 0}
div figcaption{margin-top:8px;font-size:14px;color:#8a8a8a}
div table{width:100%;border-collapse:collapse;margin:1.2em 0;font-size:16px}
div th,div td{border:1px solid #202020;padding:10px 12px;text-align:left}
div th{background:#111;color:#fff}
div time{font-size:14px;letter-spacing:.06em;color:#8a8a8a}
div hr{border:0;border-top:1px solid var(--line);margin:2em 0}

/* ---------- 页脚 ---------- */
.foot{
  display:grid;
  grid-template-columns:1fr;
  gap:30px;
  padding:clamp(38px,6vw,70px) clamp(18px,4vw,34px) 26px;
  background:#050505;
  border-top:1px solid #171717;
}
.foot section{min-width:0}
.fGiant{
  margin:0 0 12px;
  font-family:var(--fh);
  font-size:clamp(30px,6vw,54px);
  line-height:1;
  letter-spacing:.03em;
  color:#fff;
  text-shadow:0 0 20px rgba(110,243,192,.28);
}
.fDesc{color:#8f8f8f;font-size:15px;max-width:36ch}
.foot h3{
  margin:0 0 12px;
  font-size:14px;
  letter-spacing:.22em;
  color:var(--neon);
}
.foot h3 span{display:inline-block;padding-bottom:6px;border-bottom:1px solid #1f3a30}
.foot ul{list-style:none;margin:0;padding:0}
.foot li a{
  display:flex;
  align-items:center;
  min-height:44px;
  padding:7px 0;
  font-size:15px;
  color:#a8a8a8;
  transition:color .2s,padding-left .2s;
}
.foot li a:hover,
.foot li a:focus-visible{color:#fff;padding-left:6px}
.toTop{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:0 16px;
  border:1px solid var(--line2);
  font-size:15px;
  color:#dcdcdc;
  transition:border-color .25s,color .25s,background .25s;
}
.toTop:hover,.toTop:focus-visible{border-color:var(--neon);color:#000;background:var(--neon)}
.colophon{
  grid-column:1/-1;
  margin-top:8px;
  padding-top:18px;
  border-top:1px solid #141414;
  text-align:center;
  font-size:14px;
  letter-spacing:.08em;
  color:#6f6f6f;
}

/* ---------- 动效 ---------- */
.js .rv{
  opacity:0;
  transform:translateY(20px);
  transition:opacity .7s ease,transform .7s ease;
}
.js .rv.in{opacity:1;transform:none}

/* ---------- 断点 ---------- */
@media (min-width:760px){
  .foot{
    grid-template-columns:1.5fr 1fr 1fr 1fr;
    gap:36px;
    padding-left:max(20px,calc((100% - 1180px)/2));
    padding-right:max(20px,calc((100% - 1180px)/2));
  }
}

@media (min-width:920px){
  .navd>summary{display:none}
  .navd>.navmenu,
  .navd:not([open]) .navmenu{
    position:static;
    display:flex;
    gap:2px;
    margin:0;
    padding:0;
    min-width:0;
    max-width:none;
    background:none;
    border:0;
    box-shadow:none;
  }
  .navmenu li a{
    min-height:40px;
    padding:8px 11px;
    font-size:15px;
    letter-spacing:.04em;
    border-left:0;
    border-bottom:2px solid transparent;
  }
  .navmenu li a:hover,
  .navmenu li a:focus-visible{
    padding-left:11px;
    background:none;
    border-left-color:transparent;
    border-bottom-color:var(--neon);
  }
}

@media (min-width:960px){
  .wrap{
    grid-template-columns:262px minmax(0,1fr);
    gap:clamp(30px,4vw,60px);
    align-items:start;
  }
  .wrap>aside{order:0}
  .wrap>section{order:0}
  aside{position:sticky;top:120px}
}

@media (max-width:640px){
  div table{display:block;overflow-x:auto;white-space:nowrap}
  .heroIn h1{font-size:27px}
  .heroGiant{opacity:.75}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .js .rv{opacity:1;transform:none;transition:none}
  *{transition-duration:.01ms !important;animation-duration:.01ms !important}
}

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