:root{
  --deep:#071A2B;
  --night:#0B2A33;
  --cyan:#3FE0D0;
  --orange:#FF7A2F;
  --grass:#4FD07A;
  --wine:#7A1F3D;
  --indigo:#2B2C6B;
  --paper:#F4F7F6;
  --mist:#93A6B0;
  --line:#1E3A4A;
  --header-h:88px;
  --header-h-compact:64px;
  --maxw:1280px;
  --gutter:24px;
  --font-sans:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono","Roboto Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --shadow-card:0 6px 18px rgba(3,12,20,.42);
  --edge:1px solid var(--line);
  --ease:cubic-bezier(.22,.61,.36,1);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
html.nav-open{overflow:hidden}
body{
  margin:0;
  background-color:var(--deep);
  color:var(--paper);
  font-family:var(--font-sans);
  font-size:17px;
  line-height:1.75;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
}
img,svg,picture{display:block;max-width:100%}
a{color:var(--cyan);text-decoration:none}
h1,h2,h3,h4,h5,p,ul,ol,figure,blockquote{margin:0}
ul,ol{list-style:none;padding:0}
button{font:inherit;color:inherit}
table{border-collapse:collapse}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:2px}
#main-content{scroll-margin-top:calc(var(--header-h) + 16px)}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.04em}

/* ---------- 版式 ---------- */
.display-1{
  font-family:var(--font-sans);
  font-weight:900;
  font-size:clamp(44px,7vw,96px);
  line-height:.98;
  letter-spacing:-.03em;
  font-stretch:90%;
}
.h-section{
  font-weight:700;
  font-size:clamp(24px,3vw,38px);
  line-height:1.16;
  letter-spacing:-.01em;
}
.h-card{font-weight:500;font-size:18px;line-height:1.4}
.lede{
  font-size:clamp(17px,1.7vw,21px);
  line-height:1.7;
  color:rgba(244,247,246,.86);
  max-width:34em;
}
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-size:12px;
  letter-spacing:.12em;
  color:var(--mist);
}
.eyebrow::before{content:"";width:16px;height:1px;background:var(--cyan);flex:none}
.rule{height:1px;border:0;background:var(--line);margin:0}

/* ---------- 容器与栅格 ---------- */
.container{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 var(--gutter)}
.shell-top{padding-top:calc(var(--header-h) + 40px)}
.grid-12{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:24px}
.col-4{grid-column:span 4}
.col-5{grid-column:span 5}
.col-6{grid-column:span 6}
.col-7{grid-column:span 7}
.col-8{grid-column:span 8}

/* ---------- 章节 ---------- */
.section{position:relative;padding:clamp(72px,10vw,128px) 0}
.section--tight{padding:clamp(48px,6vw,80px) 0}
.section--night{background-color:var(--night)}
.section--wine{background-image:linear-gradient(135deg,#5C1630,var(--wine) 42%,var(--indigo))}
.section--paper{background-color:var(--paper);color:var(--deep)}
.section--paper .lede{color:#22414F}
.section--paper .eyebrow{color:#4A6B78}
.section--slant{clip-path:polygon(0 2.4vw,100% 0,100% 100%,0 calc(100% - 2.4vw))}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  min-height:44px;
  padding:10px 20px;
  border:1px solid var(--line);
  border-radius:2px;
  background:transparent;
  color:var(--paper);
  font-size:15px;
  font-weight:500;
  letter-spacing:.02em;
  text-decoration:none;
  cursor:pointer;
  transition:transform .2s var(--ease),background-color .2s var(--ease),border-color .2s var(--ease),color .2s var(--ease);
}
.btn:hover{transform:translateY(-2px)}
.btn--primary{
  background-color:var(--orange);
  border-color:var(--orange);
  color:#071A2B;
  font-weight:700;
  box-shadow:0 6px 18px rgba(255,122,47,.24);
}
.btn--primary:hover{background-color:#FF8E4D;border-color:#FF8E4D}
.btn--ghost{color:var(--cyan);border-color:rgba(63,224,208,.5)}
.btn--ghost:hover{background-color:rgba(63,224,208,.1);border-color:var(--cyan)}

/* ---------- 头部 ---------- */
.site-header{
  position:fixed;
  top:0;
  left:0;
  right:0;
  z-index:120;
  height:var(--header-h);
  background-color:transparent;
  background-image:linear-gradient(180deg,rgba(7,26,43,.86),rgba(7,26,43,0));
  border-bottom:1px solid transparent;
  transition:height .24s var(--ease),background-color .24s var(--ease),border-color .24s var(--ease);
}
.site-header[data-scrolled]{
  height:var(--header-h-compact);
  background-image:none;
  background-color:rgba(7,26,43,.97);
  border-bottom-color:var(--line);
}
.site-header__inner{
  position:relative;
  z-index:3;
  height:100%;
  max-width:var(--maxw);
  margin:0 auto;
  padding:0 var(--gutter);
  display:flex;
  align-items:center;
  gap:24px;
}
.skip-link{
  position:absolute;
  left:16px;
  top:-64px;
  z-index:200;
  padding:10px 18px;
  background-color:var(--cyan);
  color:var(--deep);
  font-size:14px;
  font-weight:700;
  border-radius:2px;
  transition:top .2s var(--ease);
}
.skip-link:focus{top:10px}
.header-progress{
  position:absolute;
  left:0;
  right:0;
  bottom:0;
  height:2px;
  z-index:4;
  background-color:var(--cyan);
  transform:scaleX(0);
  transform-origin:0 50%;
  box-shadow:0 0 12px rgba(63,224,208,.6);
  pointer-events:none;
}
.brand{display:inline-flex;align-items:center;gap:12px;flex:none;color:var(--paper);text-decoration:none}
.brand__tick{
  width:2px;
  height:26px;
  flex:none;
  background-image:linear-gradient(180deg,var(--cyan),rgba(63,224,208,.12));
  box-shadow:0 0 14px rgba(63,224,208,.5);
}
.brand__text{display:flex;flex-direction:column;gap:2px;line-height:1.12}
.brand__title{font-size:17px;font-weight:900;letter-spacing:.02em}
.brand__sub{font-size:11px;letter-spacing:.14em;color:var(--mist)}
.site-nav{flex:1;display:flex;align-items:center;justify-content:center;min-width:0}
.site-nav__list{display:flex;align-items:center;gap:2px;flex-wrap:nowrap}
.site-nav__item{flex:none}
.site-nav__link{
  position:relative;
  display:inline-block;
  padding:10px 12px;
  color:rgba(244,247,246,.84);
  font-size:15px;
  letter-spacing:.02em;
  white-space:nowrap;
  text-decoration:none;
  transition:color .2s var(--ease);
}
.site-nav__link::after{
  content:"";
  position:absolute;
  left:12px;
  right:12px;
  bottom:4px;
  height:1px;
  background-color:var(--cyan);
  transform:scaleX(0);
  transform-origin:0 50%;
  transition:transform .24s var(--ease);
}
.site-nav__link:hover{color:var(--paper)}
.site-nav__link:hover::after{transform:scaleX(1)}
.site-nav__link[aria-current="page"]{color:var(--cyan)}
.site-nav__link[aria-current="page"]::after{transform:scaleX(1)}
.site-nav__foot{display:none}
.header-actions{display:flex;align-items:center;gap:14px;flex:none}
.header-note{font-size:11px;line-height:1.4;letter-spacing:.06em;color:var(--mist)}
.nav-toggle{
  display:none;
  align-items:center;
  gap:10px;
  margin-left:auto;
  padding:8px 12px;
  background-color:transparent;
  border:1px solid var(--line);
  border-radius:2px;
  color:var(--paper);
  cursor:pointer;
}
.nav-toggle__label{font-size:12px;letter-spacing:.14em}
.nav-toggle__bars{display:flex;flex-direction:column;gap:4px;width:18px}
.nav-toggle__bars span{display:block;height:1px;background-color:var(--cyan);transition:transform .24s var(--ease)}
.site-header[data-open] .nav-toggle__bars span:first-child{transform:translateY(2.5px) rotate(45deg)}
.site-header[data-open] .nav-toggle__bars span:last-child{transform:translateY(-2.5px) rotate(-45deg)}

/* ---------- 页脚 ---------- */
.site-footer{
  position:relative;
  overflow:hidden;
  background-image:linear-gradient(180deg,var(--deep),var(--night) 62%,#0A2230);
  border-top:1px solid var(--line);
  color:var(--paper);
}
.site-footer__scale{
  height:26px;
  opacity:.55;
  border-bottom:1px solid var(--line);
  background-image:
    repeating-linear-gradient(90deg,var(--cyan) 0 1px,transparent 1px 120px),
    repeating-linear-gradient(90deg,var(--line) 0 1px,transparent 1px 24px);
  background-repeat:repeat-x,repeat-x;
  background-size:100% 14px,100% 8px;
  background-position:0 0,0 0;
}
.site-footer__inner{
  max-width:var(--maxw);
  margin:0 auto;
  padding:56px var(--gutter) 32px;
}
.footer__grid{display:grid;grid-template-columns:4fr 2fr 2fr 2fr;gap:40px 32px}
.footer__brand{max-width:38ch}
.footer__lockup{display:flex;align-items:center;gap:12px}
.footer__lockup-text{display:flex;flex-direction:column;gap:2px;line-height:1.12}
.footer__brand-name{font-size:20px;font-weight:900;letter-spacing:.02em}
.footer__brand-sub{font-size:11px;letter-spacing:.14em;color:var(--mist)}
.footer__rhythm{
  margin-top:20px;
  padding-left:14px;
  border-left:2px solid rgba(63,224,208,.55);
  font-size:13px;
  line-height:1.7;
  color:var(--mist);
}
.footer__contact{margin-top:22px;display:grid;gap:8px}
.footer__contact-line{display:flex;flex-wrap:wrap;align-items:baseline;gap:10px;font-size:13px}
.footer__contact-key{
  min-width:5em;
  font-size:11px;
  letter-spacing:.12em;
  color:var(--mist);
}
.footer__contact-value{color:var(--paper);word-break:break-all}
.footer__contact-link{
  color:var(--cyan);
  font-size:13px;
  border-bottom:1px solid rgba(63,224,208,.35);
  padding-bottom:1px;
  transition:border-color .2s var(--ease),color .2s var(--ease);
}
.footer__contact-link:hover{border-color:var(--cyan);color:#7CF3E6}
.footer__col-title{
  display:flex;
  align-items:center;
  gap:10px;
  margin-bottom:16px;
  font-size:12px;
  font-weight:500;
  letter-spacing:.12em;
  color:var(--mist);
}
.footer__col-title::before{content:"";width:16px;height:1px;background-color:var(--cyan);flex:none}
.footer__links{display:grid;gap:10px}
.footer__link{
  display:inline-block;
  color:rgba(244,247,246,.86);
  font-size:15px;
  text-decoration:none;
  transition:color .2s var(--ease),transform .2s var(--ease);
}
.footer__link:hover{color:var(--cyan);transform:translateX(4px)}
.footer__address{
  margin-top:48px;
  padding-top:20px;
  border-top:1px solid var(--line);
  font-size:12px;
  letter-spacing:.04em;
  color:var(--mist);
}
.footer__meta{
  margin-top:16px;
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:10px 28px;
  font-size:12px;
  letter-spacing:.06em;
  color:var(--mist);
}
.footer__legal{color:var(--mist)}
.footer__copy{color:rgba(147,166,176,.85)}
.footer__annotation{
  position:absolute;
  right:10px;
  top:120px;
  margin:0;
  writing-mode:vertical-rl;
  font-size:12px;
  letter-spacing:.32em;
  color:rgba(147,166,176,.42);
  pointer-events:none;
}

/* ---------- 面包屑 ---------- */
.crumbs{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  margin:0 0 28px;
  font-size:12px;
  letter-spacing:.08em;
  color:var(--mist);
}
.crumbs a{color:var(--mist);text-decoration:none}
.crumbs a:hover{color:var(--cyan)}
.crumbs__sep{color:var(--line)}

/* ---------- 卡片 ---------- */
.panel{
  position:relative;
  padding:clamp(20px,2.4vw,28px);
  background-color:rgba(11,42,51,.74);
  border:var(--edge);
  border-radius:2px;
  box-shadow:var(--shadow-card);
  transition:border-color .24s var(--ease),transform .24s var(--ease);
}
.panel:hover{border-color:var(--cyan);transform:translateY(-4px)}
.panel--lift{margin-top:-32px}
.panel--shift-a{margin-left:-16px}
.panel--shift-b{margin-right:-16px}
.section--paper .panel{background-color:#FFFFFF;border-color:#D8E3E3;color:var(--deep);box-shadow:0 6px 18px rgba(20,50,60,.12)}

/* ---------- 图片容器 ---------- */
.media-frame{
  position:relative;
  overflow:hidden;
  border:1px solid var(--line);
  border-radius:1px;
  background-image:linear-gradient(140deg,var(--night),var(--deep) 55%,var(--indigo));
  clip-path:polygon(0 0,calc(100% - 26px) 0,100% 26px,100% 100%,26px 100%,0 calc(100% - 26px));
}
.media-frame img,.media-frame picture{width:100%;height:100%;object-fit:cover}
.media-frame img{aspect-ratio:16/10}
.media-frame--wide img{aspect-ratio:21/9}
.media-frame--tall img{aspect-ratio:3/4}
.media-frame::before,.media-frame::after{
  content:"";
  position:absolute;
  width:26px;
  height:26px;
  pointer-events:none;
}
.media-frame::before{top:12px;left:12px;border-top:2px solid var(--cyan);border-left:2px solid var(--cyan)}
.media-frame::after{bottom:12px;right:12px;border-bottom:2px solid var(--cyan);border-right:2px solid var(--cyan)}
.media-frame__label{
  position:absolute;
  left:14px;
  bottom:14px;
  padding:4px 10px;
  background-color:rgba(7,26,43,.82);
  border:1px solid rgba(63,224,208,.4);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  color:var(--cyan);
}

/* ---------- 表格 ---------- */
.data-table-wrap{
  overflow-x:auto;
  border:1px solid var(--line);
  border-radius:2px;
  box-shadow:var(--shadow-card);
}
.data-table{width:100%;min-width:560px;font-size:15px}
.data-table th{
  padding:14px 16px;
  background-color:var(--paper);
  color:var(--deep);
  font-size:12px;
  font-weight:700;
  letter-spacing:.08em;
  text-align:left;
  white-space:nowrap;
}
.data-table td{padding:14px 16px;border-top:1px solid var(--line);vertical-align:top}
.data-table tbody tr:nth-child(even){background-color:var(--night)}

/* ---------- 标签 ---------- */
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 10px;
  border:1px solid var(--line);
  border-radius:999px;
  font-size:12px;
  letter-spacing:.08em;
  color:var(--mist);
  white-space:nowrap;
}
.tag--cyan{color:var(--cyan);border-color:rgba(63,224,208,.45)}
.tag--orange{color:var(--orange);border-color:rgba(255,122,47,.45)}
.tag--grass{color:var(--grass);border-color:rgba(79,208,122,.45)}

/* ---------- 正文 ---------- */
.prose{max-width:34em;color:rgba(244,247,246,.9)}
.prose p{margin:0 0 1.1em}
.prose ul,.prose ol{list-style:disc;padding-left:1.4em;margin:0 0 1.2em}
.prose ol{list-style:decimal}
.prose li{margin:.35em 0}
.prose strong{font-weight:700;color:var(--paper)}
.prose a{border-bottom:1px solid rgba(63,224,208,.4)}
.section--paper .prose{color:#20323C}
.section--paper .prose strong{color:var(--deep)}

/* ---------- 筛选 ---------- */
.filter-bar{display:flex;flex-wrap:wrap;gap:10px;align-items:center}
.filter-btn{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:8px 14px;
  background-color:transparent;
  border:1px solid var(--line);
  border-radius:2px;
  color:var(--mist);
  font-size:14px;
  letter-spacing:.04em;
  cursor:pointer;
  transition:color .2s var(--ease),border-color .2s var(--ease),background-color .2s var(--ease);
}
.filter-btn::before{
  content:"";
  width:6px;
  height:6px;
  border-radius:50%;
  background-color:transparent;
  box-shadow:inset 0 0 0 1px currentColor;
  transition:background-color .2s var(--ease);
}
.filter-btn:hover{color:var(--paper);border-color:rgba(63,224,208,.45)}
.filter-btn[aria-pressed="true"]{
  color:var(--cyan);
  border-color:var(--cyan);
  background-color:rgba(63,224,208,.08);
}
.filter-btn[aria-pressed="true"]::before{background-color:var(--cyan);box-shadow:0 0 0 3px rgba(63,224,208,.18)}
[data-filter-item][hidden]{display:none !important}

/* ---------- 折叠面板 ---------- */
.accordion{border-top:1px solid var(--line)}
.accordion__item{border-bottom:1px solid var(--line)}
.accordion__trigger{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:20px;
  width:100%;
  padding:20px 0;
  background-color:transparent;
  border:0;
  color:var(--paper);
  font-size:18px;
  font-weight:500;
  text-align:left;
  cursor:pointer;
}
.accordion__icon{
  font-family:var(--font-mono);
  font-size:20px;
  line-height:1;
  color:var(--mist);
  transition:transform .24s var(--ease),color .24s var(--ease);
}
.accordion__trigger[aria-expanded="true"] .accordion__icon{color:var(--cyan);transform:rotate(45deg)}
.accordion__panel{padding:0 0 22px;max-width:34em;color:var(--mist)}
.accordion__panel[hidden]{display:none}

/* ---------- 入场 ---------- */
[data-reveal]{transition:opacity .5s var(--ease),transform .5s var(--ease)}
.js [data-reveal]{opacity:0;transform:translateY(12px);transition-delay:calc(var(--i,0) * 60ms)}
.js [data-reveal].is-in{opacity:1;transform:none}

/* ---------- 响应式 ---------- */
@media(max-width:1180px){
  .header-note{display:none}
}
@media(max-width:1024px){
  .site-header{--header-h:64px}
  .header-actions{display:none}
  .nav-toggle{display:inline-flex}
  .site-nav{
    position:fixed;
    inset:0;
    z-index:2;
    flex-direction:column;
    justify-content:flex-start;
    padding:calc(var(--header-h) + 28px) var(--gutter) 32px;
    background-color:var(--deep);
    background-image:linear-gradient(160deg,var(--deep),var(--night) 55%,var(--indigo));
    overflow-y:auto;
    opacity:0;
    visibility:hidden;
    transform:translateY(-10px);
    transition:opacity .24s var(--ease),transform .24s var(--ease),visibility .24s linear;
  }
  .site-nav__list{flex-direction:column;align-items:stretch;gap:0;counter-reset:navidx}
  .site-nav__item{border-bottom:1px solid var(--line)}
  .site-nav__item:first-child{border-top:1px solid var(--line)}
  .site-nav__link{
    display:flex;
    align-items:baseline;
    gap:14px;
    padding:18px 2px;
    font-size:22px;
    font-weight:700;
    letter-spacing:-.01em;
    color:var(--paper);
    white-space:normal;
  }
  .site-nav__link::before{
    counter-increment:navidx;
    content:counter(navidx,decimal-leading-zero);
    font-family:var(--font-mono);
    font-size:12px;
    letter-spacing:.08em;
    font-weight:400;
    color:var(--mist);
  }
  .site-nav__link::after{display:none}
  .site-nav__link[aria-current="page"],
  .site-nav__link[aria-current="page"]::before{color:var(--cyan)}
  .site-nav__foot{display:block;margin-top:auto;padding-top:32px}
  .site-nav__cta{
    display:flex;
    align-items:center;
    justify-content:space-between;
    gap:12px;
    padding:16px 18px;
    background-color:var(--orange);
    color:#071A2B;
    font-weight:700;
    border-radius:2px;
  }
  .site-nav__cta::after{content:"→";font-family:var(--font-mono)}
  .site-nav__meta{margin-top:14px;font-size:12px;letter-spacing:.06em;color:var(--mist)}
  .site-header[data-open] .site-nav{opacity:1;visibility:visible;transform:none}
  .footer__grid{grid-template-columns:1fr 1fr;gap:36px 24px}
  .footer__brand{grid-column:1 / -1}
  .footer__annotation{display:none}
}
@media(max-width:960px){
  .col-4,.col-5,.col-6,.col-7,.col-8{grid-column:span 12}
  .panel--lift{margin-top:0}
  .section--slant{clip-path:none}
}
@media(max-width:768px){
  body{font-size:16px}
  .panel--shift-a{margin-left:0}
  .panel--shift-b{margin-right:0}
  .footer__grid{grid-template-columns:1fr}
  .footer__address{margin-top:32px}
}
@media(max-width:600px){
  .brand__sub{display:none}
  .site-footer__inner{padding:40px var(--gutter) 28px}
  .data-table{min-width:480px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition-duration:.001ms !important;animation-duration:.001ms !important;animation-iteration-count:1 !important}
  .js [data-reveal]{opacity:1;transform:none}
}