:root{
  --deep:#041826;
  --trench:#0A3540;
  --indigo:#181C45;
  --wine:#4A1B2E;
  --mint:#2FF3D2;
  --amber:#FFB224;
  --orange:#FF6B3D;
  --ice:#F2FAF8;
  --mist:#A6CBC9;
  --line:#23424A;
  --foam:#DFF7F2;

  --font-display:"Barlow Condensed","Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-editorial:"Noto Serif SC","Songti SC",Georgia,serif;
  --font-body:"Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"Roboto Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Consolas,monospace;

  --shell-max:1240px;
  --prose-max:720px;
  --radius-cut:18px;
  --gap:clamp(16px,2.4vw,28px);
  --pad-x:clamp(18px,4vw,48px);
  --ease:cubic-bezier(.22,.7,.28,1);
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,p,figure,blockquote,dl,dd{margin:0}
ul,ol{padding:0}
ul[class],ol[class]{list-style:none}
img,svg,video{display:block;max-width:100%}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:0}

body{
  min-height:100vh;
  background:
    radial-gradient(1200px 620px at 78% -10%,rgba(47,243,210,.13),transparent 62%),
    radial-gradient(900px 540px at 4% 34%,rgba(255,107,61,.10),transparent 60%),
    radial-gradient(760px 460px at 92% 74%,rgba(24,28,69,.85),transparent 68%),
    linear-gradient(180deg,#041826 0%,#061f2f 44%,#041826 100%);
  background-attachment:fixed;
  color:var(--ice);
  font-family:var(--font-body);
  font-size:clamp(16px,1.05vw,17.5px);
  line-height:1.75;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}

a{color:var(--mint);text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:3px}
a:hover{color:var(--ice)}
:focus-visible{outline:2px solid var(--amber);outline-offset:3px;border-radius:6px}

::selection{background:var(--mint);color:#04222a}

main{padding-top:clamp(92px,11vw,124px)}

/* ---------- 排版 ---------- */
.eyebrow{
  display:inline-block;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.24em;
  text-transform:uppercase;
  color:var(--mint);
  margin-bottom:.6rem;
}
.display-title{
  font-family:var(--font-display);
  font-weight:800;
  font-size:clamp(34px,6.2vw,78px);
  line-height:.98;
  letter-spacing:-.02em;
  text-wrap:balance;
  color:var(--ice);
}
.lede{
  font-size:clamp(16.5px,1.55vw,20px);
  line-height:1.7;
  color:var(--mist);
  max-width:52ch;
}
.prose{max-width:var(--prose-max)}
.prose p{color:rgba(242,250,248,.88);margin-bottom:1.05em}
.prose p:last-child{margin-bottom:0}
.prose h2,.prose h3{
  font-family:var(--font-display);
  font-weight:700;
  line-height:1.15;
  letter-spacing:-.01em;
  margin:1.6em 0 .55em;
}
.prose h2{font-size:clamp(23px,2.6vw,31px)}
.prose h3{font-size:clamp(18px,2vw,22px)}
.prose ul,.prose ol{padding-left:1.25em;margin-bottom:1.05em;color:rgba(242,250,248,.88)}
.prose li{margin-bottom:.4em}
.note-col{
  font-family:var(--font-editorial);
  font-size:13.5px;
  line-height:1.7;
  color:var(--mist);
  max-width:200px;
  border-left:1px solid var(--line);
  padding-left:14px;
}
.rule{height:1px;border:0;background:var(--line);margin:0}
.divider-lane{height:1px;border:0;margin:0;background:linear-gradient(90deg,transparent,var(--mint),transparent);opacity:.55}
.numeral{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  font-weight:600;
  letter-spacing:-.01em;
  color:var(--amber);
}

/* ---------- 布局 ---------- */
.container{
  width:100%;
  max-width:var(--shell-max);
  margin-inline:auto;
  padding-inline:var(--pad-x);
}
.container--wide{max-width:1440px}
.section{padding-block:clamp(48px,7vw,104px)}
.section--trench{background:var(--trench);border-block:1px solid var(--line)}
.section--indigo{background:linear-gradient(180deg,var(--indigo),#10143a);border-block:1px solid var(--line)}
.section--wine{background:linear-gradient(180deg,var(--wine),#340f20);border-block:1px solid rgba(255,107,61,.28)}
.grid{display:grid;gap:var(--gap)}
.grid--2{grid-template-columns:repeat(auto-fit,minmax(min(100%,320px),1fr))}
.grid--3{grid-template-columns:repeat(auto-fit,minmax(min(100%,260px),1fr))}
.grid--rail{
  display:grid;
  grid-auto-flow:column;
  grid-auto-columns:minmax(240px,74%);
  gap:var(--gap);
  overflow-x:auto;
  scroll-snap-type:x mandatory;
  padding-bottom:14px;
  scrollbar-color:var(--line) transparent;
}
.grid--rail > *{scroll-snap-align:start}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.55em;
  padding:12px 24px;
  border-radius:999px;
  border:1px solid transparent;
  font-family:var(--font-display);
  font-weight:700;
  font-size:16px;
  letter-spacing:.05em;
  line-height:1.2;
  text-decoration:none;
  cursor:pointer;
  transition:background .22s var(--ease),color .22s var(--ease),border-color .22s var(--ease),transform .22s var(--ease);
}
.btn--primary{background:var(--orange);color:#2a0d02;box-shadow:0 14px 30px -18px rgba(255,107,61,.95)}
.btn--primary:hover{background:#ff8358;color:#2a0d02;transform:translateY(-1px)}
.btn--ghost{background:transparent;border-color:var(--line);color:var(--ice)}
.btn--ghost:hover{border-color:var(--mint);color:var(--mint);transform:translateY(-1px)}
.btn--mint{background:var(--mint);color:#04222a}
.btn--mint:hover{background:#7bfbe4;color:#04222a}

/* ---------- 标签与面板 ---------- */
.chip{
  display:inline-flex;
  align-items:center;
  gap:.4em;
  padding:5px 12px;
  border-radius:999px;
  border:1px solid var(--line);
  background:rgba(35,66,74,.35);
  color:var(--mist);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  white-space:nowrap;
}
.chip--mint{background:var(--mint);border-color:var(--mint);color:#04222a}
.chip--amber{background:var(--amber);border-color:var(--amber);color:#2a1a00}
.tagplate{
  display:inline-flex;
  align-items:center;
  gap:.55em;
  padding:6px 12px;
  border:1px solid var(--line);
  border-radius:4px;
  font-family:var(--font-editorial);
  font-size:12.5px;
  letter-spacing:.14em;
  color:var(--mist);
  background:rgba(4,24,38,.5);
}
.panel{
  padding:clamp(18px,2.4vw,30px);
  border:1px solid var(--line);
  border-radius:var(--radius-cut);
  background:linear-gradient(158deg,rgba(10,53,64,.92),rgba(24,28,69,.72));
}
.panel--cut{
  border-radius:0;
  border-color:rgba(47,243,210,.28);
  clip-path:polygon(0 0,calc(100% - 22px) 0,100% 22px,100% 100%,22px 100%,0 calc(100% - 22px));
}
.panel--indigo{
  background:linear-gradient(158deg,rgba(24,28,69,.95),rgba(10,53,64,.55));
  border-color:rgba(166,203,201,.22);
}

/* ---------- 图片容器 ---------- */
.media-frame{
  position:relative;
  margin:0;
  overflow:hidden;
  border:1px solid var(--line);
  border-radius:var(--radius-cut);
  background:
    radial-gradient(120% 92% at 14% 0%,rgba(47,243,210,.22),transparent 58%),
    linear-gradient(155deg,var(--trench),var(--indigo) 64%,var(--wine));
}
.media-frame img{
  width:100%;
  height:100%;
  aspect-ratio:16/10;
  object-fit:cover;
}
.media-frame::after{
  content:"";
  position:absolute;
  inset:auto -14% -38% auto;
  width:62%;
  height:78%;
  background:linear-gradient(105deg,transparent,rgba(47,243,210,.16));
  transform:rotate(9deg);
  pointer-events:none;
}
.media-frame--wide img{aspect-ratio:21/9}
.media-frame--tall img{aspect-ratio:3/4}
.media-frame figcaption{
  padding:12px 16px;
  font-family:var(--font-editorial);
  font-size:12.5px;
  letter-spacing:.06em;
  color:var(--mist);
  border-top:1px solid var(--line);
}

/* ---------- 面包屑 ---------- */
.breadcrumbs{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.1em;
  color:var(--mist);
}
.breadcrumbs ol{display:flex;flex-wrap:wrap;gap:.45rem;margin:0;padding:0;list-style:none}
.breadcrumbs li{display:flex;align-items:center;gap:.45rem}
.breadcrumbs li + li::before{content:"/";color:var(--line)}
.breadcrumbs a{color:var(--mist);text-decoration:none}
.breadcrumbs a:hover{color:var(--mint)}
.breadcrumbs [aria-current="page"]{color:var(--ice)}

/* ---------- 标签页 ---------- */
.tabs{display:grid;gap:18px}
.tablist{
  display:flex;
  flex-wrap:wrap;
  gap:6px;
  padding:6px;
  width:fit-content;
  max-width:100%;
  border:1px solid var(--line);
  border-radius:999px;
  background:rgba(4,24,38,.6);
}
.tab{
  padding:8px 16px;
  border-radius:999px;
  font-family:var(--font-display);
  font-weight:700;
  font-size:14.5px;
  letter-spacing:.05em;
  color:var(--mist);
  cursor:pointer;
  transition:background .2s var(--ease),color .2s var(--ease);
}
.tab:hover{color:var(--ice)}
.tab[aria-selected="true"]{background:var(--mint);color:#04222a}
.tabpanel{padding-top:4px}
.tabpanel[hidden]{display:none}

/* ---------- 手风琴 ---------- */
.accordion{border-top:1px solid var(--line)}
.accordion-item{border-bottom:1px solid var(--line)}
.accordion-trigger{
  width:100%;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  padding:18px 4px;
  text-align:left;
  font-weight:600;
  color:var(--ice);
  cursor:pointer;
}
.accordion-trigger::after{
  content:"+";
  font-family:var(--font-mono);
  font-size:18px;
  color:var(--mint);
}
.accordion-trigger[aria-expanded="true"]::after{content:"–"}
.accordion-panel{padding:0 4px 20px;color:var(--mist)}
.accordion-panel[hidden]{display:none}

/* ---------- 显现 ---------- */
html.anim-ready .reveal{opacity:0;transform:translateY(18px)}
html.anim-ready .reveal.is-visible{
  opacity:1;
  transform:none;
  transition:opacity .42s var(--ease),transform .42s var(--ease);
}

/* ---------- Skip link ---------- */
.skip-link{
  position:fixed;
  top:-100px;
  left:16px;
  z-index:200;
  padding:12px 20px;
  border-radius:0 0 12px 12px;
  background:var(--mint);
  color:#04222a;
  font-weight:700;
  text-decoration:none;
  transition:top .2s var(--ease);
}
.skip-link:focus{top:0;color:#04222a}

/* ---------- 头部 ---------- */
.site-header{
  position:fixed;
  inset:0;
  z-index:80;
  display:flex;
  align-items:flex-start;
  justify-content:flex-end;
  padding:clamp(10px,1.8vw,22px) clamp(12px,2.6vw,32px);
  pointer-events:none;
}
.header-island{
  position:relative;
  pointer-events:auto;
  display:flex;
  align-items:center;
  gap:clamp(10px,1.8vw,26px);
  max-width:min(100%,1120px);
  padding:8px 10px 8px 18px;
  margin-right:clamp(0px,4vw,72px);
  border:1px solid var(--line);
  border-radius:999px;
  background:rgba(4,24,38,.82);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  box-shadow:0 22px 48px -30px rgba(0,0,0,.95),inset 0 1px 0 rgba(47,243,210,.10);
  transition:padding .34s var(--ease),margin .34s var(--ease),background .34s var(--ease),transform .34s var(--ease);
}
.brand{
  display:inline-flex;
  align-items:center;
  gap:10px;
  padding:4px 6px 4px 2px;
  border-radius:999px;
  text-decoration:none;
  color:var(--ice);
  white-space:nowrap;
}
.brand-mark{display:grid;gap:3px;width:22px}
.brand-mark i{display:block;height:3px;border-radius:2px;background:linear-gradient(90deg,var(--mint),rgba(47,243,210,.22))}
.brand-mark i:nth-child(1){width:100%}
.brand-mark i:nth-child(2){width:70%}
.brand-mark i:nth-child(3){width:88%;background:linear-gradient(90deg,var(--amber),rgba(255,178,36,.22))}
.brand-text{display:flex;flex-direction:column;line-height:1.15}
.brand-name{
  font-family:var(--font-display);
  font-weight:800;
  font-size:18px;
  letter-spacing:.04em;
  transition:color .2s var(--ease);
}
.brand:hover .brand-name{color:var(--mint)}
.brand-tagline{font-size:10.5px;letter-spacing:.14em;color:var(--mist)}
.brand-version{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.06em;
  color:var(--amber);
  border:1px solid rgba(255,178,36,.45);
  border-radius:999px;
  padding:2px 8px;
}
.nav-toggle{
  display:none;
  align-items:center;
  gap:8px;
  margin-left:auto;
  padding:9px 14px;
  border:1px solid var(--line);
  border-radius:999px;
  color:var(--ice);
  font-family:var(--font-display);
  font-weight:700;
  font-size:14px;
  letter-spacing:.1em;
  cursor:pointer;
}
.nav-toggle-bars{display:grid;gap:4px;width:16px}
.nav-toggle-bars i{display:block;height:2px;border-radius:2px;background:var(--mint);transition:transform .25s var(--ease),width .25s var(--ease)}
.nav-toggle-bars i:last-child{width:70%}
.site-header[data-open] .nav-toggle-bars i:first-child{transform:translateY(3px) rotate(45deg)}
.site-header[data-open] .nav-toggle-bars i:last-child{width:100%;transform:translateY(-3px) rotate(-45deg)}
.nav-toggle-label{font-size:13px}
.site-nav{display:flex;align-items:center;gap:clamp(8px,1.4vw,18px)}
.nav-list{display:flex;align-items:center;gap:2px;margin:0}
.nav-item{display:flex}
.nav-link{
  display:inline-flex;
  align-items:center;
  padding:9px 14px;
  border-radius:999px;
  color:var(--mist);
  font-size:14.5px;
  font-weight:500;
  letter-spacing:.02em;
  text-decoration:none;
  white-space:nowrap;
  transition:color .2s var(--ease),background .2s var(--ease);
}
.nav-link:hover{color:var(--ice);background:rgba(47,243,210,.10)}
.nav-link[aria-current="page"]{color:#04222a;background:var(--mint);font-weight:700}
.nav-cta{
  display:inline-flex;
  align-items:center;
  gap:.4em;
  padding:9px 18px;
  border-radius:999px;
  background:var(--orange);
  color:#2a0d02;
  font-family:var(--font-display);
  font-weight:700;
  font-size:14.5px;
  letter-spacing:.05em;
  text-decoration:none;
  white-space:nowrap;
  transition:background .2s var(--ease),transform .2s var(--ease);
}
.nav-cta:hover{background:#ff8358;color:#2a0d02;transform:translateY(-1px)}
.header-progress{
  position:fixed;
  top:0;
  left:0;
  right:0;
  height:2px;
  z-index:90;
  pointer-events:none;
  background:rgba(35,66,74,.55);
}
.header-progress-bar{
  display:block;
  height:100%;
  width:100%;
  transform:scaleX(0);
  transform-origin:0 50%;
  background:linear-gradient(90deg,var(--mint),var(--amber));
}

/* ---------- 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(56px,8vw,116px);
  border-top:1px solid var(--line);
  background:
    linear-gradient(180deg,rgba(74,27,46,.55) 0%,rgba(4,24,38,0) 42%),
    var(--deep);
  overflow:hidden;
}
.site-footer::before{
  content:"";
  position:absolute;
  inset:0 0 auto 0;
  height:110px;
  background:repeating-linear-gradient(102deg,transparent 0 36px,rgba(47,243,210,.10) 36px 37px);
  -webkit-mask-image:linear-gradient(180deg,#000,transparent);
  mask-image:linear-gradient(180deg,#000,transparent);
  pointer-events:none;
}
.footer-inner{
  position:relative;
  display:grid;
  gap:clamp(30px,4vw,54px);
  grid-template-columns:minmax(0,1fr);
  padding-block:clamp(46px,6vw,76px) clamp(30px,4vw,48px);
}
.footer-brand{max-width:420px}
.footer-eyebrow{
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--mint);
  margin-bottom:14px;
}
.footer-title{
  font-family:var(--font-display);
  font-weight:800;
  font-size:clamp(26px,3.6vw,40px);
  line-height:1.06;
  letter-spacing:-.015em;
  margin-bottom:12px;
}
.footer-summary{color:var(--mist);font-size:15px;margin-bottom:20px}
.footer-cols{display:grid;gap:clamp(20px,3vw,34px);grid-template-columns:repeat(auto-fit,minmax(120px,1fr))}
.footer-col-title{
  font-family:var(--font-editorial);
  font-size:13px;
  letter-spacing:.16em;
  color:var(--mist);
  margin-bottom:12px;
  font-weight:400;
}
.footer-links{display:grid;gap:8px;margin:0}
.footer-links a{
  color:var(--ice);
  text-decoration:none;
  font-size:14.5px;
  border-bottom:1px solid transparent;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.footer-links a:hover{color:var(--mint);border-bottom-color:rgba(47,243,210,.5)}
.footer-contact{min-width:0}
.contact-row{
  display:grid;
  grid-template-columns:minmax(0,1fr) auto;
  align-items:center;
  gap:2px 10px;
  padding:11px 0;
  border-bottom:1px solid rgba(35,66,74,.75);
}
.contact-label{
  grid-column:1 / -1;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  color:var(--mist);
}
.contact-value{
  grid-column:1;
  color:var(--ice);
  font-size:14.5px;
  overflow-wrap:anywhere;
}
.copy-btn{
  grid-column:2;
  align-self:center;
  padding:4px 10px;
  border:1px solid var(--line);
  border-radius:999px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  color:var(--mist);
  cursor:pointer;
  transition:border-color .2s var(--ease),color .2s var(--ease);
}
.copy-btn:hover{border-color:var(--mint);color:var(--mint)}
.contact-note{
  margin-top:14px;
  font-family:var(--font-editorial);
  font-size:12.5px;
  line-height:1.7;
  color:var(--mist);
  border-left:1px solid rgba(255,178,36,.5);
  padding-left:12px;
}
.copy-status{min-height:1.2em;margin-top:8px;font-size:12px;color:var(--mint)}
.footer-base{border-top:1px solid var(--line);background:rgba(4,24,38,.7)}
.footer-base-inner{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:8px 26px;
  padding-block:18px 22px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--mist);
}

/* ---------- 平板 ---------- */
@media (min-width:760px){
  .footer-inner{grid-template-columns:minmax(0,1.05fr) minmax(0,1.25fr)}
  .footer-contact{grid-column:1 / -1}
  .grid--rail{grid-auto-columns:minmax(260px,46%)}
}
@media (min-width:1020px){
  .footer-inner{grid-template-columns:minmax(0,1.15fr) minmax(0,1.15fr) minmax(0,.95fr)}
  .footer-contact{grid-column:auto}
  .grid--rail{grid-auto-columns:minmax(280px,32%)}
}

/* ---------- 移动导航 ---------- */
@media (max-width:899px){
  .site-header{padding:10px 14px}
  .header-island{
    flex-wrap:wrap;
    width:100%;
    max-width:100%;
    margin-right:0;
    padding:10px 14px;
    border-radius:22px;
  }
  .brand-tagline{display:none}
  .nav-toggle{display:inline-flex}
  .site-nav{
    order:3;
    flex-basis:100%;
    display:none;
    flex-direction:column;
    align-items:stretch;
    gap:6px;
    margin-top:12px;
    padding-top:12px;
    border-top:1px solid var(--line);
  }
  .site-header[data-open] .site-nav{display:flex}
  .nav-list{flex-direction:column;align-items:stretch;gap:2px;width:100%}
  .nav-item{width:100%}
  .nav-link{display:block;width:100%;padding:11px 12px;border-radius:12px;font-size:15px}
  .nav-cta{justify-content:center;width:100%;margin-top:6px;padding:11px 18px}
  .note-col{max-width:none}
  .grid--rail{grid-auto-columns:minmax(220px,82%)}
}

/* ---------- 桌面紧凑浮岛 ---------- */
@media (min-width:900px){
  .site-header.is-compact{
    align-items:flex-end;
    justify-content:flex-start;
    padding:0 0 clamp(14px,2vw,24px) clamp(14px,2vw,24px);
  }
  .site-header.is-compact .header-island{
    margin:0;
    padding:6px 8px 6px 14px;
    background:rgba(4,24,38,.94);
    transform:scale(.97);
    transform-origin:left bottom;
    box-shadow:0 18px 42px -24px rgba(0,0,0,.95);
  }
  .site-header.is-compact .brand-tagline{display:none}
  .site-header.is-compact .nav-link{padding:6px 10px;font-size:13.5px}
  .site-header.is-compact .nav-cta{padding:7px 14px;font-size:13.5px}
}

/* ---------- 减少动态 ---------- */
@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.anim-ready .reveal{opacity:1;transform:none}
}