/* ===== 01 重置 ===== */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,figure,blockquote,dl,dd,h1,h2,h3,h4,p,ul,ol{margin:0}
ul,ol{padding:0;list-style:none}
img,picture,svg{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
main{display:block}
#main-content{outline:none}

/* ===== 02 变量 ===== */
:root{
  --ink:#061613;
  --green:#0B2B26;
  --cyan:#35F0C8;
  --orange:#FF8A3D;
  --red:#E5484D;
  --blue:#5B9DFF;
  --paper:#F3E9D7;
  --brown:#211713;
  --moss:#7FA79A;
  --mist:#B8FFF0;
  --white:#EAFBF6;

  --font-display:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",-apple-system,"Segoe UI",system-ui,sans-serif;
  --font-body:var(--font-display);
  --font-mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,"Liberation Mono",monospace;

  --max:1240px;
  --gutter:clamp(16px,3.2vw,40px);
  --radius:18px;
  --cut:clamp(10px,1.4vw,18px);
  --line:rgba(53,240,200,.20);
  --line-soft:rgba(184,255,240,.12);
  --ease:cubic-bezier(.22,.7,.3,1);
}

/* ===== 03 基础排版 ===== */
body{
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.8;
  letter-spacing:.01em;
  color:var(--mist);
  background-color:var(--green);
  background-image:radial-gradient(1100px 560px at 82% -12%,rgba(53,240,200,.10),transparent 62%);
  min-height:100vh;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{
  font-family:var(--font-display);
  font-weight:800;
  letter-spacing:-.02em;
  line-height:1.14;
  color:var(--white);
}
h1{font-size:clamp(2rem,4.4vw,3.5rem);line-height:1.08}
h2{font-size:clamp(1.55rem,3vw,2.25rem);line-height:1.16}
h3{font-size:clamp(1.15rem,1.8vw,1.5rem);line-height:1.3}
h4{font-size:1.05rem}
:where(a,button,[tabindex]):focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:4px}

.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.04em}

/* ===== 04 跳过链接 ===== */
.skip-link{
  position:fixed;
  top:12px;left:var(--gutter);
  z-index:200;
  padding:11px 20px;
  background:var(--cyan);
  color:#03110E;
  font-weight:800;
  font-size:14px;
  border-radius:999px;
  box-shadow:0 16px 34px -18px rgba(0,0,0,.9);
  transform:translateY(-160%);
  transition:transform .22s var(--ease);
}
.skip-link:focus-visible{transform:translateY(0)}

/* ===== 05 头部 ===== */
.site-header{
  position:sticky;
  top:0;
  z-index:80;
  padding:12px var(--gutter) 13px;
  background:linear-gradient(180deg,rgba(5,20,17,.97) 0%,rgba(5,20,17,.90) 62%,rgba(5,20,17,.74) 100%);
  border-bottom:1px solid rgba(53,240,200,.16);
}
.header-rail{
  position:relative;
  display:flex;
  align-items:center;
  gap:clamp(8px,1.6vw,22px);
  width:100%;
  max-width:var(--max);
  margin-inline:auto;
  padding:7px 8px 7px 14px;
  background:linear-gradient(100deg,rgba(11,43,38,.98) 0%,rgba(7,27,24,.95) 60%,rgba(6,22,19,.99) 100%);
  border:1px solid rgba(53,240,200,.22);
  border-radius:999px;
  box-shadow:0 22px 44px -32px #000,inset 0 1px 0 rgba(184,255,240,.09);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
}
.header-rail::before{
  content:"";
  position:absolute;
  left:clamp(190px,27%,330px);
  top:9px;bottom:9px;
  width:1px;
  background:linear-gradient(180deg,transparent,rgba(53,240,200,.42),transparent);
  transform:skewX(-9deg);
  pointer-events:none;
}
.brand{
  display:flex;
  align-items:center;
  gap:11px;
  flex:0 0 auto;
  padding:3px 0;
  color:var(--white);
}
.brand-mark{
  display:grid;
  place-items:center;
  width:36px;height:36px;
  background:var(--cyan);
  color:#04120F;
  font-family:var(--font-mono);
  font-size:14px;
  font-weight:800;
  letter-spacing:-.12em;
  clip-path:polygon(0 0,100% 0,100% 64%,64% 100%,0 100%);
  transition:background-color .2s var(--ease);
}
.brand:hover .brand-mark{background:var(--orange)}
.brand-text{display:flex;flex-direction:column;line-height:1.16}
.brand-name{font-size:15.5px;font-weight:800;letter-spacing:.01em}
.brand-sub{font-family:var(--font-mono);font-size:10.5px;letter-spacing:.04em;color:rgba(127,167,154,.95);white-space:nowrap}
.nav-toggle{display:none}
.nav-toggle-text{font-family:var(--font-mono);font-size:12px;letter-spacing:.08em}
.site-nav{display:flex;align-items:center;gap:clamp(6px,1vw,14px);margin-left:auto}
.nav-list{display:flex;align-items:center;gap:2px}
.nav-item{display:block}
.nav-link{
  display:inline-flex;
  align-items:center;
  gap:7px;
  padding:9px 13px;
  border-radius:999px;
  font-size:14px;
  font-weight:600;
  color:rgba(184,255,240,.82);
  transition:color .18s var(--ease),background-color .18s var(--ease);
}
.nav-link::before{
  content:"";
  width:5px;height:5px;
  border-radius:50%;
  background:currentColor;
  opacity:0;
  transition:opacity .18s var(--ease);
}
.nav-link:hover{color:var(--white);background:rgba(53,240,200,.10)}
.nav-link:hover::before{opacity:.85;color:var(--cyan)}
.nav-link[aria-current="page"]{background:var(--cyan);color:#03110E;font-weight:800}
.nav-link[aria-current="page"]::before{opacity:1;color:#03110E}
.nav-cta{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:10px 18px;
  border-radius:999px;
  background:var(--orange);
  color:#1C0F05;
  font-size:14px;
  font-weight:800;
  white-space:nowrap;
  box-shadow:0 12px 26px -16px rgba(255,138,61,.95);
  transition:background-color .2s var(--ease),transform .2s var(--ease);
}
.nav-cta::after{content:"→";font-family:var(--font-mono);transition:transform .2s var(--ease)}
.nav-cta:hover{background:#FFA469;transform:translateY(-1px)}
.nav-cta:hover::after{transform:translateX(3px)}
.header-status{
  display:flex;
  align-items:center;
  gap:9px;
  max-width:var(--max);
  margin:9px auto 0;
  padding-inline:clamp(4px,1.2vw,16px);
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.03em;
  line-height:1.55;
  color:rgba(127,167,154,.95);
}
.status-dot{
  flex:0 0 auto;
  width:7px;height:7px;
  border-radius:50%;
  background:var(--cyan);
  box-shadow:0 0 0 3px rgba(53,240,200,.15);
  animation:statusPulse 2.6s ease-in-out infinite;
}
.status-text{color:rgba(184,255,240,.68)}
@keyframes statusPulse{0%,100%{opacity:1}50%{opacity:.35}}
.scroll-rail{
  position:absolute;
  left:0;right:0;bottom:0;
  height:2px;
  background:rgba(53,240,200,.10);
  overflow:hidden;
}
.scroll-rail-fill{
  display:block;
  height:100%;
  width:100%;
  transform:scaleX(0);
  transform-origin:0 50%;
  background:linear-gradient(90deg,var(--cyan),var(--orange));
  transition:transform .12s linear;
}
.to-top{
  position:fixed;
  right:clamp(14px,2.4vw,30px);
  bottom:clamp(14px,2.4vw,30px);
  z-index:70;
  display:grid;
  place-items:center;
  width:46px;height:46px;
  border-radius:14px 14px 14px 4px;
  background:rgba(11,43,38,.94);
  border:1px solid rgba(53,240,200,.42);
  color:var(--cyan);
  font-family:var(--font-mono);
  font-size:16px;
  box-shadow:0 18px 32px -22px #000;
  transition:opacity .2s var(--ease),transform .2s var(--ease),background-color .2s var(--ease),color .2s var(--ease);
}
.to-top:hover{background:var(--cyan);color:#03110E}
.to-top[data-visible="false"]{opacity:0;transform:translateY(14px);pointer-events:none}

/* ===== 06 页脚 ===== */
.site-footer{
  position:relative;
  overflow:hidden;
  background:radial-gradient(120% 150% at 86% -30%,rgba(53,240,200,.10),transparent 58%),var(--ink);
  color:var(--mist);
}
.footer-lanes{
  height:5px;
  background:linear-gradient(90deg,var(--cyan) 0 22%,var(--blue) 22% 46%,var(--orange) 46% 72%,var(--red) 72% 100%);
  opacity:.85;
}
.footer-inner{
  position:relative;
  max-width:var(--max);
  margin-inline:auto;
  padding:clamp(34px,5vw,64px) var(--gutter) 0;
}
.footer-top{
  display:grid;
  grid-template-columns:minmax(0,4fr) minmax(0,6fr);
  gap:clamp(22px,4vw,56px);
  padding-bottom:clamp(24px,4vw,44px);
  border-bottom:1px solid rgba(53,240,200,.16);
}
.footer-brand-name{
  font-size:clamp(1.5rem,2.4vw,2rem);
  font-weight:800;
  letter-spacing:-.02em;
  color:var(--white);
}
.footer-brand-name::before{
  content:"//";
  font-family:var(--font-mono);
  color:var(--cyan);
  margin-right:10px;
  letter-spacing:-.1em;
}
.footer-brand-line{margin-top:12px;max-width:34ch;font-size:14.5px;line-height:1.8;color:rgba(184,255,240,.72)}
.footer-brand-meta{margin-top:14px;font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:rgba(53,240,200,.78)}
.footer-cols{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(16px,2.4vw,32px)}
.footer-col-title{
  margin-bottom:14px;
  font-family:var(--font-mono);
  font-size:11.5px;
  font-weight:700;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--cyan);
}
.footer-links{display:grid;gap:9px}
.footer-link{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-size:14.5px;
  color:rgba(184,255,240,.78);
  transition:color .16s var(--ease),transform .16s var(--ease);
}
.footer-link::before{
  content:"";
  width:6px;height:1px;
  background:currentColor;
  opacity:.55;
  transition:width .16s var(--ease),opacity .16s var(--ease);
}
.footer-link:hover{color:var(--cyan);transform:translateX(2px)}
.footer-link:hover::before{width:15px;opacity:1}
.footer-contact{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(min(100%,240px),1fr));
  gap:clamp(14px,2vw,24px);
  padding-block:clamp(24px,3.4vw,38px);
  border-bottom:1px solid rgba(53,240,200,.14);
}
.contact-row{display:flex;flex-direction:column;gap:4px}
.contact-label{
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:rgba(127,167,154,.92);
}
.contact-value{font-size:14px;line-height:1.7;color:rgba(184,255,240,.92);word-break:break-word}
.contact-row .mono{font-size:13.5px;letter-spacing:.02em;color:var(--mist)}
.contact-note{
  grid-column:1/-1;
  max-width:74ch;
  padding-left:12px;
  border-left:2px solid rgba(255,138,61,.62);
  font-size:13px;
  line-height:1.85;
  color:rgba(127,167,154,.96);
}
.footer-base{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:12px 22px;
  padding-block:clamp(18px,2.6vw,26px) clamp(22px,3vw,32px);
  font-size:12px;
  color:rgba(127,167,154,.95);
}
.footer-copy{font-size:12px;letter-spacing:.04em}
.footer-icp{font-size:12px;letter-spacing:.04em;color:rgba(184,255,240,.72)}
.footer-legal{display:flex;flex-wrap:wrap;gap:16px;margin-left:auto}
.footer-legal a{
  font-size:12px;
  color:rgba(184,255,240,.72);
  border-bottom:1px solid rgba(53,240,200,.3);
  padding-bottom:1px;
  transition:color .16s var(--ease),border-color .16s var(--ease);
}
.footer-legal a:hover{color:var(--cyan);border-color:var(--cyan)}

/* ===== 07 布局与通用构件 ===== */
.container{width:100%;max-width:var(--max);margin-inline:auto;padding-inline:var(--gutter)}
.container--narrow{max-width:840px}
.section{position:relative;padding-block:clamp(56px,7.5vw,112px)}
.section--paper{background:var(--paper);color:var(--brown)}
.section--paper :is(h1,h2,h3,h4){color:var(--brown)}
.section--ink{background:var(--ink);border-block:1px solid var(--line-soft)}
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-family:var(--font-mono);
  font-size:12.5px;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--cyan);
}
.eyebrow::before{content:"";width:26px;height:2px;background:currentColor;transform:skewX(-20deg)}
.lede{max-width:62ch;font-size:clamp(1.02rem,1.5vw,1.22rem);line-height:1.78;color:rgba(184,255,240,.82)}
.section--paper .lede{color:rgba(33,23,19,.8)}
.rule{height:1px;border:0;margin-block:clamp(22px,4vw,44px);background:linear-gradient(90deg,var(--cyan),rgba(53,240,200,0))}
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 10px;
  border:1px solid currentColor;
  border-radius:999px;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.06em;
  color:var(--cyan);
  background:rgba(53,240,200,.08);
}
.tag--red{color:var(--red);background:rgba(229,72,77,.10)}
.tag--blue{color:var(--blue);background:rgba(91,157,255,.10)}
.btn{
  display:inline-flex;
  align-items:center;
  gap:10px;
  padding:13px 24px;
  border:1px solid transparent;
  border-radius:999px;
  font-size:15px;
  font-weight:800;
  line-height:1.2;
  transition:transform .2s var(--ease),background-color .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease);
}
.btn--primary{background:var(--orange);color:#1C0F05;box-shadow:0 16px 32px -20px rgba(255,138,61,.95)}
.btn--primary:hover{background:#FFA469;transform:translateY(-2px)}
.btn--ghost{border-color:rgba(53,240,200,.45);color:var(--cyan);background:rgba(53,240,200,.06)}
.btn--ghost:hover{background:rgba(53,240,200,.16);transform:translateY(-2px)}
.btn--sm{padding:9px 16px;font-size:13.5px}
.panel{
  position:relative;
  padding:clamp(18px,2.4vw,30px);
  background:rgba(11,43,38,.72);
  border:1px solid var(--line);
  border-radius:var(--radius);
}
.panel--paper{background:var(--paper);color:var(--brown);border-color:rgba(33,23,19,.14)}
.panel--paper :is(h1,h2,h3,h4){color:var(--brown)}
.panel--cut{
  border-radius:0;
  clip-path:polygon(var(--cut) 0,100% 0,100% calc(100% - var(--cut)),calc(100% - var(--cut)) 100%,0 100%,0 var(--cut));
}
.prose{max-width:70ch;font-size:17px;line-height:1.9;color:rgba(184,255,240,.86)}
.prose h2{margin-block:1.6em .5em;font-size:clamp(1.35rem,2vw,1.6rem)}
.prose h3{margin-block:1.3em .4em}
.prose p{margin-block:.9em}
.prose ul{display:grid;gap:.5em;margin-block:1em}
.prose ul li{position:relative;padding-left:1.3em}
.prose ul li::before{
  content:"";
  position:absolute;
  left:0;top:.72em;
  width:7px;height:7px;
  border-radius:1px;
  background:var(--cyan);
  transform:rotate(45deg);
}
.prose a{color:var(--cyan);text-decoration:underline;text-underline-offset:3px}
.section--paper .prose{color:rgba(33,23,19,.88)}
.breadcrumbs{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  font-family:var(--font-mono);
  font-size:12.5px;
  letter-spacing:.06em;
  color:var(--moss);
}
.breadcrumbs li{display:flex;align-items:center;gap:8px}
.breadcrumbs li+li::before{content:"/";color:rgba(127,167,154,.55)}
.breadcrumbs a{color:var(--moss);border-bottom:1px solid transparent;transition:color .16s var(--ease)}
.breadcrumbs a:hover{color:var(--cyan);border-color:currentColor}
.breadcrumbs [aria-current="page"]{color:var(--mist)}
.grid{display:grid;gap:clamp(18px,2.6vw,34px)}
.grid--split{grid-template-columns:minmax(0,7fr) minmax(0,5fr);align-items:start}
.grid--cards{grid-template-columns:repeat(auto-fit,minmax(min(100%,260px),1fr))}
.card-flow{columns:3;column-gap:clamp(16px,2.2vw,28px)}
.card-flow>*{break-inside:avoid;margin-bottom:clamp(16px,2.2vw,28px)}
.media{
  position:relative;
  overflow:hidden;
  aspect-ratio:16/10;
  border-radius:var(--radius);
  background:radial-gradient(120% 120% at 18% 0%,rgba(53,240,200,.20),rgba(6,22,19,.92) 62%);
}
.media img{width:100%;height:100%;object-fit:cover}
.media::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background:linear-gradient(180deg,rgba(6,22,19,0) 46%,rgba(6,22,19,.58));
}
.media--wide{aspect-ratio:21/9}
.media--tall{aspect-ratio:4/5}
.media--cut{
  border-radius:0;
  clip-path:polygon(0 0,100% 0,100% calc(100% - var(--cut)),calc(100% - var(--cut)) 100%,0 100%);
}
.figure-num{
  font-family:var(--font-mono);
  font-weight:700;
  font-size:clamp(2rem,4vw,3rem);
  line-height:1;
  letter-spacing:-.03em;
  color:var(--cyan);
  font-variant-numeric:tabular-nums;
}

/* ===== 08 显现动效 ===== */
html.js-reveal [data-reveal]{opacity:0;transform:translateY(16px)}
html.js-reveal [data-reveal].is-visible{
  opacity:1;
  transform:none;
  transition:opacity .5s var(--ease),transform .5s var(--ease);
}

/* ===== 09 响应式 ===== */
@media (max-width:1100px){
  .brand-sub{display:none}
  .nav-link{padding:9px 10px;font-size:13.5px}
}
@media (max-width:980px){
  .header-rail{padding:7px 8px 7px 12px;border-radius:26px}
  .header-rail::before{display:none}
  .nav-toggle{
    display:inline-flex;
    align-items:center;
    gap:8px;
    margin-left:auto;
    padding:8px 13px;
    border:1px solid rgba(53,240,200,.34);
    border-radius:999px;
    background:rgba(53,240,200,.07);
    color:var(--mist);
    font-size:13px;
    font-weight:700;
    transition:color .2s var(--ease),border-color .2s var(--ease),background-color .2s var(--ease);
  }
  .nav-toggle-bars{display:inline-flex;flex-direction:column;gap:3px;width:16px}
  .nav-toggle-bars span{display:block;height:2px;border-radius:2px;background:currentColor;transition:transform .2s var(--ease),opacity .2s var(--ease)}
  .nav-toggle[aria-expanded="true"]{color:var(--cyan);border-color:var(--cyan);background:rgba(53,240,200,.16)}
  .nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(1){transform:translateY(5px) rotate(45deg)}
  .nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(2){opacity:0}
  .nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(3){transform:translateY(-5px) rotate(-45deg)}
  .site-nav{
    position:absolute;
    top:calc(100% + 10px);
    left:0;right:0;
    display:none;
    flex-direction:column;
    align-items:stretch;
    gap:8px;
    max-height:calc(100vh - 150px);
    overflow:auto;
    padding:14px;
    margin-left:0;
    background:linear-gradient(165deg,rgba(11,43,38,.99),rgba(6,22,19,.99));
    border:1px solid rgba(53,240,200,.26);
    border-radius:22px;
    box-shadow:0 32px 64px -34px #000;
  }
  .site-nav[data-open="true"]{display:flex;animation:navDrop .22s var(--ease) both}
  .nav-list{flex-direction:column;align-items:stretch;gap:4px}
  .nav-item{width:100%}
  .nav-link{
    width:100%;
    justify-content:flex-start;
    padding:12px 14px;
    border-radius:14px;
    font-size:15px;
    background:rgba(184,255,240,.04);
  }
  .nav-cta{width:100%;justify-content:center;margin-top:4px;padding:13px 18px}
  .footer-top{grid-template-columns:1fr}
  .footer-cols{grid-template-columns:repeat(auto-fit,minmax(140px,1fr))}
  .grid--split{grid-template-columns:1fr}
}
@keyframes navDrop{from{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:none}}
@media (max-width:1000px){
  .card-flow{columns:2}
}
@media (max-width:720px){
  .header-status{font-size:10.5px;gap:8px}
  .footer-legal{margin-left:0}
}
@media (max-width:640px){
  .card-flow{columns:1}
  .brand-mark{width:32px;height:32px;font-size:12.5px}
  .brand-name{font-size:14.5px}
  .footer-base{flex-direction:column;align-items:flex-start;gap:10px}
}

/* ===== 10 降级 ===== */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms!important;
    animation-iteration-count:1!important;
    transition-duration:.001ms!important;
  }
  html.js-reveal [data-reveal]{opacity:1;transform:none}
  .to-top[data-visible="false"]{transform:none}
}