:root{
  --ink:#080B0A;
  --ink-deep:#050807;
  --turf:#0A211B;
  --turf-2:#0D2A22;
  --pitch:#67FFC7;
  --pulse:#19C9A2;
  --amber:#FFB54A;
  --rose:#FF4F8B;
  --paper:#F1F6F2;
  --moss:#91A89F;
  --haze:#2E4940;
  --glass:rgba(10,33,27,.62);
  --font-display:"Inter Tight","Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --font-body:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --font-mono:"DIN Alternate","JetBrains Mono",ui-monospace,Menlo,Consolas,monospace;
  --shell:1200px;
  --gutter:clamp(16px,4vw,48px);
  --radius:14px;
  --ease:cubic-bezier(.22,.61,.36,1);
}

*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--ink);
  color:var(--paper);
  font-family:var(--font-body);
  font-size:16px;
  font-weight:400;
  line-height:1.72;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  overflow-x:hidden;
}
img,svg,video,picture{display:block;max-width:100%;}
h1,h2,h3,h4,h5,h6{
  margin:0;
  font-family:var(--font-display);
  font-weight:800;
  line-height:1.15;
  letter-spacing:-.015em;
  color:var(--paper);
}
p{margin:0 0 1em;}
ul,ol{margin:0;padding:0;}
a{color:inherit;}
button{font:inherit;color:inherit;}
hr{border:0;height:0;}
::selection{background:rgba(103,255,199,.3);color:#04140F;}
a:focus-visible,
button:focus-visible,
summary:focus-visible,
[tabindex]:focus-visible{
  outline:2px solid var(--pitch);
  outline-offset:3px;
}

/* ---------- 布局与工具 ---------- */
.shell{
  width:100%;
  max-width:var(--shell);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.page-main{
  display:block;
  padding-block:clamp(20px,3vw,36px) 0;
  min-height:60vh;
}
#main-content{
  display:block;
  scroll-margin-top:132px;
}
.section{padding-block:clamp(32px,5vw,64px);}
.section--wide{
  background:linear-gradient(180deg,rgba(10,33,27,.62),rgba(8,11,10,0));
  border-block:1px solid rgba(46,73,64,.55);
}
.section--narrow{max-width:74ch;margin-inline:auto;}
.mono{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  letter-spacing:.02em;
}
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:9px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--moss);
}
.eyebrow::before{
  content:"";
  width:20px;
  height:1px;
  background:var(--pulse);
  flex:none;
}
.rule{
  height:1px;
  border:0;
  margin-block:clamp(24px,4vw,40px);
  background:linear-gradient(90deg,var(--haze),rgba(46,73,64,0));
}

/* ---------- 面包屑 ---------- */
.crumbs{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  padding-block:14px 0;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--moss);
}
.crumbs a{color:var(--moss);text-decoration:none;transition:color .18s var(--ease);}
.crumbs a:hover{color:var(--pitch);}
.crumbs [aria-current="page"]{color:var(--paper);}
.crumbs__sep{color:var(--haze);}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  gap:10px;
  padding:12px 22px;
  border:1px solid transparent;
  border-radius:999px;
  font-family:var(--font-body);
  font-size:14px;
  font-weight:700;
  letter-spacing:.04em;
  text-decoration:none;
  cursor:pointer;
  transition:background .18s var(--ease),color .18s var(--ease),transform .18s var(--ease),box-shadow .18s var(--ease);
}
.btn--primary{
  background:var(--pitch);
  color:#04140F;
  box-shadow:0 0 0 1px rgba(103,255,199,.5),0 10px 28px rgba(25,201,162,.18);
}
.btn--primary:hover{background:#8EFFD7;transform:translateY(-1px);}
.btn--ghost{
  color:var(--pitch);
  border-color:rgba(103,255,199,.4);
  background:rgba(103,255,199,.06);
}
.btn--ghost:hover{background:rgba(103,255,199,.14);border-color:rgba(103,255,199,.7);}
.btn--amber{
  color:var(--amber);
  border-color:rgba(255,181,74,.42);
  background:rgba(255,181,74,.08);
}
.btn--amber:hover{background:rgba(255,181,74,.16);border-color:rgba(255,181,74,.7);}

/* ---------- 标签 / 卡片 / 栅格 ---------- */
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 10px;
  border-radius:999px;
  border:1px solid rgba(103,255,199,.28);
  background:rgba(103,255,199,.1);
  color:var(--pitch);
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.08em;
  white-space:nowrap;
}
.tag--amber{
  color:var(--amber);
  border-color:rgba(255,181,74,.3);
  background:rgba(255,181,74,.1);
}
.tag--rose{
  color:var(--rose);
  border-color:rgba(255,79,139,.32);
  background:rgba(255,79,139,.1);
}
.card{
  position:relative;
  padding:clamp(18px,2.4vw,28px);
  border:1px solid var(--haze);
  border-radius:var(--radius);
  background:var(--turf);
}
.card--glass{
  background:var(--glass);
  border-color:rgba(103,255,199,.16);
  -webkit-backdrop-filter:blur(16px) saturate(140%);
  backdrop-filter:blur(16px) saturate(140%);
}
.grid{
  display:grid;
  gap:clamp(16px,2.2vw,28px);
}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr));}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr));}

/* ---------- 图片容器基础规则 ---------- */
.media{
  position:relative;
  overflow:hidden;
  isolation:isolate;
  aspect-ratio:16/10;
  border:1px solid var(--haze);
  border-radius:var(--radius);
  background:linear-gradient(150deg,var(--turf-2),var(--ink-deep));
}
.media > img,
.media > picture,
.media > picture > img{
  width:100%;
  height:100%;
  object-fit:cover;
}
.media::after{
  content:"";
  position:absolute;
  right:0;
  bottom:0;
  width:42%;
  height:2px;
  background:linear-gradient(90deg,rgba(103,255,199,0),var(--pitch));
  opacity:.6;
  pointer-events:none;
}
.media--wide{aspect-ratio:21/9;}
.media--tall{aspect-ratio:3/4;}
.media--square{aspect-ratio:1/1;}
.media__caption{
  position:absolute;
  inset-inline:0;
  bottom:0;
  padding:16px;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.06em;
  line-height:1.5;
  color:var(--paper);
  background:linear-gradient(0deg,rgba(5,8,7,.94),rgba(5,8,7,0));
}

/* ---------- 长文 ---------- */
.prose{
  max-width:72ch;
  font-size:16.5px;
  line-height:1.85;
  color:rgba(241,246,242,.88);
}
.prose h2{
  margin:1.6em 0 .6em;
  font-size:clamp(24px,3vw,32px);
}
.prose h3{
  margin:1.4em 0 .5em;
  font-size:clamp(19px,2vw,22px);
}
.prose p{margin:0 0 1.1em;}
.prose ul,.prose ol{
  margin:0 0 1.2em;
  padding-left:1.3em;
  list-style:disc;
}
.prose ol{list-style:decimal;}
.prose li{margin-bottom:.45em;}
.prose a{
  color:var(--pitch);
  text-decoration:underline;
  text-underline-offset:3px;
  text-decoration-thickness:1px;
  text-decoration-color:rgba(103,255,199,.45);
}
.prose strong{color:var(--paper);font-weight:700;}
.prose blockquote{
  margin:1.4em 0;
  padding:14px 20px;
  border-left:2px solid var(--amber);
  background:rgba(255,181,74,.06);
  color:var(--paper);
}

/* ---------- 章节索引 ---------- */
.toc{
  display:grid;
  gap:2px;
  font-size:14px;
}
.toc a{
  display:flex;
  align-items:center;
  gap:10px;
  padding:9px 12px;
  border-left:2px solid transparent;
  border-radius:10px;
  color:var(--moss);
  text-decoration:none;
  transition:color .18s var(--ease),background .18s var(--ease),border-color .18s var(--ease);
}
.toc a:hover{color:var(--paper);background:rgba(103,255,199,.07);}
.toc a[aria-current="true"]{
  color:var(--pitch);
  border-left-color:var(--pitch);
  background:rgba(103,255,199,.08);
}

/* ---------- 页头 ---------- */
.skip-link{
  position:absolute;
  left:16px;
  top:-80px;
  z-index:200;
  padding:10px 18px;
  border-radius:0 0 10px 10px;
  background:var(--pitch);
  color:#04140F;
  font-size:14px;
  font-weight:700;
  text-decoration:none;
  transition:top .18s var(--ease);
}
.skip-link:focus,
.skip-link:focus-visible{top:0;}

.site-header{
  position:sticky;
  top:0;
  z-index:80;
  background:rgba(8,11,10,.95);
  border-bottom:1px solid var(--haze);
  box-shadow:0 1px 0 rgba(103,255,199,.06);
}

.scroll-progress{
  position:fixed;
  inset-inline:0;
  top:0;
  z-index:120;
  height:2px;
  pointer-events:none;
}
.scroll-progress__bar{
  display:block;
  width:0;
  height:100%;
  background:linear-gradient(90deg,var(--pulse),var(--pitch));
  box-shadow:0 0 12px rgba(103,255,199,.65);
  transition:width .12s linear;
}

.masthead{
  padding-block:clamp(14px,2vw,22px);
  border-bottom:1px solid rgba(46,73,64,.65);
  transition:padding .25s var(--ease);
}
.site-header[data-scrolled] .masthead{padding-block:10px;}
.masthead__inner{
  display:grid;
  grid-template-columns:1fr auto 1fr;
  align-items:center;
  gap:clamp(12px,2vw,28px);
}
.masthead__tagline{
  justify-self:start;
  margin:0;
  max-width:22ch;
  font-size:13px;
  line-height:1.55;
  letter-spacing:.02em;
  color:var(--moss);
}
.brand{
  justify-self:center;
  display:inline-grid;
  justify-items:center;
  gap:5px;
  text-decoration:none;
  color:var(--paper);
}
.brand__name{
  font-family:var(--font-display);
  font-size:clamp(22px,2.6vw,30px);
  font-weight:800;
  line-height:1;
  letter-spacing:.16em;
  text-indent:.16em;
  color:var(--paper);
  transition:color .2s var(--ease);
}
.brand:hover .brand__name{color:var(--pitch);}
.brand__edition{
  display:block;
  max-height:20px;
  overflow:hidden;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  color:var(--moss);
  transition:max-height .25s var(--ease),opacity .2s var(--ease);
}
.site-header[data-scrolled] .brand__edition{
  max-height:0;
  opacity:0;
}
.masthead__signal{
  justify-self:end;
  display:inline-flex;
  align-items:center;
  gap:10px;
  padding:6px 13px;
  border:1px solid rgba(103,255,199,.24);
  border-radius:999px;
  background:rgba(103,255,199,.06);
}
.signal-dot{
  width:7px;
  height:7px;
  border-radius:50%;
  background:var(--pitch);
  animation:pulseDot 2.6s var(--ease) infinite;
}
.signal-label{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  color:var(--pitch);
  white-space:nowrap;
}
@keyframes pulseDot{
  0%{box-shadow:0 0 0 0 rgba(103,255,199,.55);}
  70%{box-shadow:0 0 0 9px rgba(103,255,199,0);}
  100%{box-shadow:0 0 0 0 rgba(103,255,199,0);}
}

.nav-bar{
  position:relative;
  background:linear-gradient(180deg,rgba(10,33,27,.66),rgba(8,11,10,.28));
}
.nav-inner{
  display:grid;
  grid-template-columns:1fr auto 1fr;
  align-items:center;
  gap:12px;
  min-height:56px;
}
.nav-toggle{
  grid-column:1;
  justify-self:start;
  display:none;
  align-items:center;
  gap:9px;
  padding:8px 13px;
  border:1px solid var(--haze);
  border-radius:10px;
  background:rgba(10,33,27,.75);
  color:var(--paper);
  cursor:pointer;
  transition:border-color .18s var(--ease),background .18s var(--ease);
}
.nav-toggle:hover{border-color:rgba(103,255,199,.5);background:rgba(103,255,199,.08);}
.nav-toggle__bars{
  display:inline-grid;
  gap:4px;
  width:16px;
  flex:none;
}
.nav-toggle__bars i{
  display:block;
  height:2px;
  border-radius:2px;
  background:var(--pitch);
  transition:transform .2s var(--ease),opacity .2s var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(1){transform:translateY(6px) rotate(45deg);}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(2){opacity:0;}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(3){transform:translateY(-6px) rotate(-45deg);}
.nav-toggle__label{
  font-family:var(--font-mono);
  font-size:12.5px;
  letter-spacing:.12em;
  color:inherit;
}

.nav{
  grid-column:2;
  justify-self:center;
}
.nav-list{
  display:flex;
  align-items:center;
  gap:2px;
  list-style:none;
}
.nav-link{
  position:relative;
  display:inline-flex;
  align-items:center;
  padding:8px 14px;
  border-radius:999px;
  font-size:14px;
  letter-spacing:.05em;
  color:var(--moss);
  text-decoration:none;
  transition:color .18s var(--ease),background .18s var(--ease);
}
.nav-link::after{
  content:"";
  position:absolute;
  left:14px;
  right:14px;
  bottom:4px;
  height:1px;
  background:var(--pitch);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .22s var(--ease);
}
.nav-link:hover{color:var(--paper);background:rgba(103,255,199,.07);}
.nav-link:hover::after{transform:scaleX(1);}
.nav-link[aria-current="page"]{
  color:var(--pitch);
  background:rgba(103,255,199,.1);
  box-shadow:inset 0 0 0 1px rgba(103,255,199,.24);
}
.nav-link[aria-current="page"]::after{transform:scaleX(1);}

.nav-cta{
  grid-column:3;
  justify-self:end;
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:9px 18px;
  border-radius:999px;
  background:var(--pitch);
  color:#04140F;
  font-size:13.5px;
  font-weight:700;
  letter-spacing:.04em;
  text-decoration:none;
  white-space:nowrap;
  box-shadow:0 0 0 1px rgba(103,255,199,.5),0 8px 24px rgba(25,201,162,.2);
  transition:background .18s var(--ease),transform .18s var(--ease),box-shadow .18s var(--ease);
}
.nav-cta::after{
  content:"›";
  font-size:16px;
  line-height:1;
}
.nav-cta:hover{
  background:#8EFFD7;
  transform:translateY(-1px);
  box-shadow:0 0 0 1px rgba(103,255,199,.85),0 12px 30px rgba(25,201,162,.34);
}

@keyframes navDrop{
  from{opacity:0;transform:translateY(-8px);}
  to{opacity:1;transform:none;}
}

/* ---------- 页脚 ---------- */
.site-footer{
  position:relative;
  isolation:isolate;
  margin-top:clamp(56px,9vw,120px);
  border-top:1px solid var(--haze);
  background:linear-gradient(180deg,var(--turf) 0%,#060A09 74%);
}
.site-footer::before{
  content:"";
  position:absolute;
  inset-inline:0;
  top:0;
  height:8px;
  background:repeating-linear-gradient(90deg,rgba(46,73,64,.95) 0 1px,rgba(0,0,0,0) 1px 28px);
  opacity:.55;
  pointer-events:none;
}
.footer-shell{
  padding-block:clamp(40px,6vw,76px) clamp(20px,3vw,30px);
}
.footer-top{
  display:grid;
  grid-template-columns:1.7fr 1fr 1fr 1.45fr;
  gap:clamp(26px,4vw,56px);
  align-items:start;
}
.footer-brand{max-width:30ch;}
.footer-brand__mark{
  display:block;
  width:10px;
  height:10px;
  margin-bottom:16px;
  border-radius:3px;
  background:var(--pitch);
  box-shadow:0 0 16px rgba(103,255,199,.85);
}
.footer-brand__line{
  margin:0 0 12px;
  font-family:var(--font-display);
  font-size:clamp(16px,1.6vw,19px);
  font-weight:700;
  line-height:1.5;
  color:var(--paper);
}
.footer-brand__meta{
  margin:0;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.14em;
  color:var(--moss);
}
.footer-col{min-width:0;}
.footer-col--contact{min-width:0;}
.footer-col__title{
  display:flex;
  align-items:center;
  gap:9px;
  margin:0 0 18px;
  font-family:var(--font-display);
  font-size:13px;
  font-weight:700;
  letter-spacing:.16em;
  color:var(--paper);
}
.footer-col__title::before{
  content:"";
  width:6px;
  height:6px;
  flex:none;
  border-radius:2px;
  background:var(--pitch);
  box-shadow:0 0 10px rgba(103,255,199,.85);
}
.footer-links{
  list-style:none;
  display:grid;
  gap:11px;
}
.footer-links a{
  display:inline-block;
  color:var(--moss);
  font-size:14.5px;
  text-decoration:none;
  transition:color .18s var(--ease),transform .18s var(--ease);
}
.footer-links a:hover{color:var(--pitch);transform:translateX(3px);}
.footer-contact{
  display:grid;
  grid-template-columns:auto minmax(0,1fr);
  gap:9px 14px;
  margin:0;
  font-size:14px;
  line-height:1.6;
}
.footer-contact dt{
  margin:0;
  padding-top:3px;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.14em;
  color:var(--moss);
  white-space:nowrap;
}
.footer-contact dd{
  margin:0;
  color:var(--paper);
  overflow-wrap:anywhere;
}
.footer-contact dd .mono{color:var(--pitch);font-size:13.5px;}
.footer-legal{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:10px 24px;
  margin-top:clamp(30px,4vw,52px);
  padding-top:18px;
  border-top:1px solid var(--haze);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.04em;
  color:var(--moss);
}
.footer-legal p{margin:0;}
.footer-legal a{color:var(--moss);text-decoration:none;}
.footer-legal a:hover{color:var(--pitch);}

.to-top{
  position:fixed;
  right:clamp(14px,3vw,32px);
  bottom:clamp(14px,3vw,32px);
  z-index:90;
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:10px 16px;
  border:1px solid rgba(103,255,199,.4);
  border-radius:999px;
  background:rgba(10,33,27,.92);
  color:var(--pitch);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.12em;
  cursor:pointer;
  box-shadow:0 12px 32px rgba(0,0,0,.5);
  transition:transform .18s var(--ease),background .18s var(--ease),box-shadow .18s var(--ease);
}
.to-top:hover{
  background:rgba(25,201,162,.2);
  transform:translateY(-2px);
  box-shadow:0 16px 38px rgba(0,0,0,.6);
}
.to-top[hidden]{display:none;}
.to-top__glyph{font-size:14px;line-height:1;}

/* ---------- 平板 ---------- */
@media (max-width:1024px){
  .footer-top{grid-template-columns:1fr 1fr;gap:36px;}
  .footer-brand{max-width:none;}
}

/* ---------- 移动导航断点 ---------- */
@media (max-width:900px){
  #main-content{scroll-margin-top:112px;}
  .masthead__inner{
    grid-template-columns:1fr auto;
    gap:12px;
  }
  .masthead__tagline{display:none;}
  .brand{justify-self:start;}
  .masthead__signal{justify-self:end;padding:5px 10px;}
  .signal-label{font-size:10px;letter-spacing:.12em;}

  .nav-toggle{display:inline-flex;}

  .nav{
    grid-column:1 / -1;
    position:absolute;
    inset-inline:0;
    top:calc(100% + 1px);
    display:none;
    max-height:calc(100vh - 140px);
    overflow-y:auto;
    padding:12px var(--gutter) 20px;
    background:rgba(8,11,10,.985);
    border-bottom:1px solid var(--haze);
    box-shadow:0 28px 56px rgba(0,0,0,.6);
  }
  .nav[data-open]{display:block;animation:navDrop .22s var(--ease) both;}
  .nav-list{
    flex-direction:column;
    align-items:stretch;
    gap:2px;
  }
  .nav-link{
    width:100%;
    justify-content:flex-start;
    padding:12px 14px;
    border-radius:10px;
    font-size:15px;
  }
  .nav-link::after{display:none;}
  .nav-link[aria-current="page"]{box-shadow:inset 0 0 0 1px rgba(103,255,199,.28);}

  .nav-cta{padding:8px 14px;font-size:13px;}
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr));}
}

/* ---------- 手机 ---------- */
@media (max-width:640px){
  .footer-top{grid-template-columns:1fr;gap:30px;}
  .footer-legal{flex-direction:column;align-items:flex-start;}
  .grid--2,.grid--3{grid-template-columns:1fr;}
  .media--wide{aspect-ratio:16/10;}
  .btn{width:100%;justify-content:center;}
}

@media (max-width:480px){
  .nav-toggle__label{display:none;}
  .nav-cta{font-size:12px;padding:8px 12px;}
  .brand__name{font-size:21px;letter-spacing:.12em;text-indent:.12em;}
}

/* ---------- 减少动效 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .signal-dot{animation:none;box-shadow:0 0 0 3px rgba(103,255,199,.18);}
  .nav[data-open]{animation:none;}
  .scroll-progress__bar{transition:none;}
}