:root{
  --ink:#0E1130;
  --tunnel:#171B3E;
  --cyan:#35F0D0;
  --orange:#FF8A3D;
  --violet:#7B5CFF;
  --paper:#F4F1E8;
  --rock:#8C93AE;
  --moss:#6FA98B;
  --clay:#C9714F;
  --proof:#4FE38A;
  --deep:#0A0C22;
  --teal-ink:#0C6E60;
  --edge:rgba(53,240,208,.28);
  --edge-soft:rgba(140,147,174,.26);
  --glow:0 0 18px rgba(53,240,208,.35);
  --glow-warm:0 0 18px rgba(255,138,61,.35);
  --maxw:1240px;
  --gut:clamp(18px,4vw,48px);
  --sans:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC","Noto Sans CJK SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  --mono:"JetBrains Mono","SFMono-Regular",Consolas,"Liberation Mono","Courier New",monospace;
  --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(--sans);
  font-size:17px;
  line-height:1.8;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img,svg,video{max-width:100%;display:block}
h1,h2,h3,h4,p,ul,ol,figure,blockquote{margin:0}
ul,ol{padding:0;list-style:none}
a{color:var(--cyan);text-decoration:none;transition:color .18s var(--ease),border-color .18s var(--ease)}
a:hover{color:var(--orange)}
button{font-family:inherit;font-size:inherit}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:2px}
::selection{background:var(--cyan);color:var(--ink)}

/* ---------- 基础排版 ---------- */
.display{
  font-size:clamp(34px,6vw,72px);
  font-weight:900;
  line-height:1.06;
  letter-spacing:-.02em;
  margin:0;
}
.title-m{
  font-size:clamp(22px,3vw,34px);
  font-weight:800;
  line-height:1.2;
  letter-spacing:-.015em;
  margin:0;
}
.lede{
  font-size:clamp(16px,1.6vw,19px);
  line-height:1.85;
  color:var(--paper);
  max-width:44em;
}
.muted{color:var(--rock)}
.mono,.note,.eyebrow,.rail-note{font-family:var(--mono)}
.note{font-size:12px;letter-spacing:.02em;color:var(--rock);line-height:1.7}
.eyebrow{
  display:inline-block;
  font-size:12px;
  letter-spacing:.3em;
  color:var(--cyan);
  text-transform:uppercase;
  margin-bottom:14px;
}
.rail-note{
  writing-mode:vertical-rl;
  font-size:12px;
  letter-spacing:.3em;
  color:var(--clay);
  text-transform:uppercase;
}
hr,.rule{border:0;border-top:1px solid var(--edge-soft);margin:0}

/* ---------- 布局容器 ---------- */
.container{width:min(100% - var(--gut)*2,var(--maxw));margin-inline:auto}
.section{padding-block:clamp(52px,8vw,116px);position:relative}
.section--deep{background:var(--ink);color:var(--paper)}
.section--tunnel{background:var(--tunnel);color:var(--paper)}
.section--paper{background:var(--paper);color:var(--ink)}
.section--paper .lede,
.section--paper .display,
.section--paper .title-m{color:var(--ink)}
.section--paper .muted,
.section--paper .note{color:#5C6178}
.section--paper .eyebrow{color:var(--teal-ink)}
.section--paper a{color:var(--teal-ink)}
.section--paper a:hover{color:var(--orange)}
.section--paper :focus-visible{outline-color:var(--teal-ink)}
.section--paper .rule,
.section--paper hr{border-top-color:rgba(14,17,48,.16)}

.canvas{
  display:grid;
  grid-template-columns:repeat(12,minmax(0,1fr));
  gap:clamp(16px,2vw,32px);
}
.col-rail{grid-column:1 / span 1}
.col-main{grid-column:2 / span 7}
.col-aside{grid-column:10 / span 3}
.col-wide{grid-column:2 / span 11}
.col-full{grid-column:1 / -1}

/* ---------- 章节头 ---------- */
.section-head{
  display:flex;
  align-items:baseline;
  flex-wrap:wrap;
  gap:14px 18px;
  border-bottom:1px solid var(--edge-soft);
  padding-bottom:14px;
  margin-bottom:clamp(24px,4vw,46px);
}
.section-head__no{
  font-family:var(--mono);
  font-size:14px;
  letter-spacing:.12em;
  color:var(--clay);
}
.section-head__title{
  font-size:clamp(20px,2.6vw,30px);
  font-weight:800;
  letter-spacing:-.015em;
  margin:0;
}
.section-head__meta{
  margin-left:auto;
  font-family:var(--mono);
  font-size:12px;
  letter-spacing:.1em;
  color:var(--rock);
}

/* ---------- 面包屑 ---------- */
.breadcrumbs{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:.55em;
  padding-block:18px;
  font-family:var(--mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--rock);
}
.breadcrumbs a{color:var(--rock)}
.breadcrumbs a:hover{color:var(--cyan)}
.breadcrumbs__sep{color:var(--clay)}
.breadcrumbs [aria-current="page"]{color:var(--paper)}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  gap:.55em;
  padding:13px 22px;
  border:2px solid var(--cyan);
  border-radius:2px;
  background:transparent;
  color:var(--paper);
  font-size:15px;
  font-weight:700;
  letter-spacing:.02em;
  text-decoration:none;
  cursor:pointer;
  transition:background-color .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease),box-shadow .18s var(--ease);
}
.btn:hover{background:var(--cyan);color:var(--ink);border-color:var(--cyan);box-shadow:var(--glow)}
.btn--signal{border-color:var(--orange);background:var(--orange);color:var(--ink)}
.btn--signal:hover{background:transparent;color:var(--orange);box-shadow:var(--glow-warm)}
.btn--ghost{border-color:var(--edge-soft);color:var(--rock)}
.btn--ghost:hover{background:transparent;color:var(--paper);border-color:var(--rock);box-shadow:none}
.section--paper .btn{border-color:var(--ink);color:var(--ink)}
.section--paper .btn:hover{background:var(--ink);color:var(--paper);border-color:var(--ink);box-shadow:none}
.section--paper .btn--signal{border-color:var(--orange);background:var(--orange);color:var(--ink)}
.section--paper .btn--signal:hover{background:transparent;color:var(--orange)}

/* ---------- 面板 / 路径组件 ---------- */
.panel{
  position:relative;
  background:var(--tunnel);
  border:1px solid var(--edge-soft);
  border-radius:3px;
  padding:clamp(18px,2.6vw,32px);
}
.panel--path{border-left:2px solid var(--cyan)}
.panel--path:hover{border-left-color:var(--orange)}
.section--paper .panel{background:#FFFFFF;border-color:rgba(14,17,48,.14)}
.section--paper .panel--path{border-left-color:var(--teal-ink)}

.path-card{
  display:flex;
  gap:16px;
  align-items:flex-start;
  padding:16px 18px;
  border:1px solid var(--edge-soft);
  border-left:2px solid var(--cyan);
  border-radius:2px;
  background:rgba(23,27,62,.65);
  color:var(--paper);
  text-decoration:none;
  transition:border-color .18s var(--ease),background-color .18s var(--ease),transform .18s var(--ease);
}
.path-card:hover{border-left-color:var(--orange);background:rgba(255,138,61,.08);color:var(--paper)}
.path-card__no{font-family:var(--mono);font-size:12px;letter-spacing:.12em;color:var(--clay);min-width:2.4em}
.path-card__title{font-size:16px;font-weight:700;color:inherit}
.path-card__text{font-size:14px;line-height:1.7;color:var(--rock);margin-top:6px}
.path-card:hover .path-card__text{color:#C8CDE0}

.path-strip{
  display:flex;
  flex-wrap:wrap;
  border-top:1px solid var(--edge-soft);
  border-bottom:1px solid var(--edge-soft);
}
.path-strip__item{
  flex:1 1 190px;
  display:flex;
  flex-direction:column;
  gap:6px;
  padding:16px 18px;
  border-right:1px solid var(--edge-soft);
  border-left:2px solid transparent;
  color:var(--paper);
  text-decoration:none;
  transition:border-color .18s var(--ease),background-color .18s var(--ease);
}
.path-strip__item:last-child{border-right:0}
.path-strip__item:hover{border-left-color:var(--orange);background:rgba(255,138,61,.07);color:var(--paper)}
.path-strip__label{font-size:15px;font-weight:700}
.path-strip__meta{font-family:var(--mono);font-size:11px;letter-spacing:.1em;color:var(--rock)}
.path-strip__item[aria-current="page"]{border-left-color:var(--cyan);background:rgba(53,240,208,.08)}
.path-strip__item[aria-current="page"] .path-strip__label{color:var(--cyan)}

/* ---------- 路径标签页 ---------- */
.path-tabs{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  margin-bottom:clamp(18px,2.4vw,28px);
}
.path-tab{
  font-family:var(--mono);
  font-size:13px;
  letter-spacing:.08em;
  padding:9px 15px;
  border:1px solid var(--edge-soft);
  border-radius:2px;
  background:transparent;
  color:var(--rock);
  cursor:pointer;
  transition:color .18s var(--ease),border-color .18s var(--ease),background-color .18s var(--ease);
}
.path-tab:hover{color:var(--cyan);border-color:var(--cyan)}
.path-tab[aria-selected="true"]{background:var(--cyan);border-color:var(--cyan);color:var(--ink)}
.path-panel[hidden]{display:none}

/* ---------- 标签 ---------- */
.tag{
  display:inline-block;
  font-family:var(--mono);
  font-size:11px;
  letter-spacing:.1em;
  padding:3px 8px;
  border:1px solid var(--edge-soft);
  border-radius:2px;
  color:var(--rock);
}
.tag--violet{border-color:rgba(123,92,255,.55);color:#B9A8FF}
.tag--moss{border-color:rgba(111,169,139,.6);color:var(--moss)}
.tag--proof{border-color:rgba(79,227,138,.55);color:var(--proof)}

/* ---------- 图片容器 ---------- */
.figure{
  position:relative;
  display:block;
  overflow:hidden;
  border:1px solid var(--edge-soft);
  border-radius:3px;
  background:var(--tunnel);
}
.figure__img{
  width:100%;
  height:100%;
  object-fit:cover;
  aspect-ratio:var(--figure-ratio,16 / 9);
  background:linear-gradient(135deg,var(--tunnel),var(--deep));
}
.figure--wide{--figure-ratio:21 / 9}
.figure--tall{--figure-ratio:3 / 4}
.figure--square{--figure-ratio:1 / 1}
.figure__caption{
  font-family:var(--mono);
  font-size:12px;
  letter-spacing:.02em;
  color:var(--rock);
  padding:10px 14px;
  border-top:1px solid var(--edge-soft);
}
.section--paper .figure{border-color:rgba(14,17,48,.14);background:#E7E3D6}
.section--paper .figure__caption{color:#5C6178;border-top-color:rgba(14,17,48,.14)}

/* ---------- 列表 ---------- */
.list-stack{display:flex;flex-direction:column;gap:12px}
.list-stack > li + li{border-top:1px dashed var(--edge-soft);padding-top:12px}
.section--paper .list-stack > li + li{border-top-color:rgba(14,17,48,.16)}

/* ---------- 显现动效 ---------- */
[data-reveal]{
  opacity:0;
  transform:translateY(16px);
  transition:opacity .5s var(--ease),transform .6s var(--ease);
  transition-delay:var(--reveal-delay,0ms);
  will-change:opacity,transform;
}
[data-reveal].is-visible{opacity:1;transform:none}

/* ---------- 跳转链接 ---------- */
.skip-link{
  position:absolute;
  left:12px;
  top:-120px;
  z-index:200;
  background:var(--cyan);
  color:var(--ink);
  font-weight:700;
  font-size:14px;
  letter-spacing:.04em;
  padding:10px 16px;
  border-radius:2px;
  text-decoration:none;
  transition:top .18s var(--ease);
}
.skip-link:focus{top:12px;color:var(--ink)}

/* ---------- 页头 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:80;
  background:linear-gradient(180deg,rgba(14,17,48,.97),rgba(14,17,48,.9));
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--edge-soft);
  color:var(--paper);
}
.header-inner{
  position:relative;
  width:min(100% - var(--gut)*2,var(--maxw));
  margin-inline:auto;
}
.masthead{
  display:grid;
  grid-template-columns:1fr auto 1fr;
  align-items:center;
  gap:clamp(12px,2vw,28px);
  padding-block:16px 14px;
}
.masthead__tagline{
  justify-self:start;
  font-family:var(--mono);
  font-size:12px;
  letter-spacing:.24em;
  color:var(--rock);
  white-space:nowrap;
}
.masthead__tagline::before{
  content:"";
  display:inline-block;
  width:22px;
  height:2px;
  margin-right:10px;
  vertical-align:middle;
  background:var(--cyan);
}
.masthead__brand{
  justify-self:center;
  display:inline-flex;
  align-items:center;
  gap:12px;
  color:var(--paper);
  text-decoration:none;
}
.masthead__brand:hover{color:var(--paper)}
.masthead__mark{
  width:10px;
  height:10px;
  background:var(--cyan);
  border-radius:1px;
  transform:rotate(45deg);
  box-shadow:var(--glow);
  flex:none;
}
.masthead__title{
  font-size:clamp(20px,2.4vw,28px);
  font-weight:900;
  letter-spacing:-.02em;
  line-height:1;
}
.masthead__sub{
  font-family:var(--mono);
  font-size:11px;
  letter-spacing:.3em;
  color:var(--cyan);
  padding-left:12px;
  border-left:1px solid var(--edge-soft);
  align-self:center;
}
.masthead__utility{
  justify-self:end;
  display:flex;
  align-items:center;
  gap:10px;
}
.utility-link{
  font-family:var(--mono);
  font-size:12px;
  letter-spacing:.1em;
  padding:8px 12px;
  border:1px solid var(--edge-soft);
  border-radius:2px;
  color:var(--rock);
  text-decoration:none;
  white-space:nowrap;
  transition:color .18s var(--ease),border-color .18s var(--ease),background-color .18s var(--ease);
}
.utility-link:hover{color:var(--cyan);border-color:var(--cyan)}
.utility-link--signal{border-color:rgba(255,138,61,.7);color:var(--orange);background:rgba(255,138,61,.1)}
.utility-link--signal:hover{background:var(--orange);color:var(--ink);border-color:var(--orange)}

.nav-toggle{
  display:none;
  align-items:center;
  gap:10px;
  background:transparent;
  border:1px solid var(--edge-soft);
  border-radius:2px;
  color:var(--paper);
  padding:9px 12px;
  cursor:pointer;
  font-family:var(--mono);
  font-size:12px;
  letter-spacing:.14em;
}
.nav-toggle:hover{border-color:var(--cyan);color:var(--cyan)}
.nav-toggle__bars{
  position:relative;
  display:block;
  width:18px;
  height:10px;
}
.nav-toggle__bars::before,
.nav-toggle__bars::after{
  content:"";
  position:absolute;
  left:0;
  width:18px;
  height:2px;
  background:currentColor;
  transition:transform .18s var(--ease);
}
.nav-toggle__bars::before{top:0}
.nav-toggle__bars::after{bottom:0}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before{transform:translateY(4px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{transform:translateY(-4px) rotate(-45deg)}

.nav-bar{
  border-top:1px solid var(--edge-soft);
}
.nav-list{
  display:flex;
  justify-content:center;
  align-items:center;
  flex-wrap:wrap;
  gap:clamp(4px,1.4vw,18px);
  width:min(100% - var(--gut)*2,var(--maxw));
  margin-inline:auto;
}
.nav-link{
  position:relative;
  display:inline-block;
  padding:14px 8px 15px;
  font-size:15px;
  font-weight:600;
  letter-spacing:.02em;
  color:#C4C9DE;
  text-decoration:none;
  transition:color .18s var(--ease);
}
.nav-link::after{
  content:"";
  position:absolute;
  left:8px;
  right:8px;
  bottom:0;
  height:2px;
  background:var(--cyan);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .24s var(--ease),background-color .18s var(--ease);
}
.nav-link:hover{color:var(--cyan)}
.nav-link:hover::after{transform:scaleX(1)}
.nav-link[aria-current="page"]{color:var(--paper)}
.nav-link[aria-current="page"]::after{transform:scaleX(1);background:var(--cyan);box-shadow:var(--glow)}

.scroll-progress{
  position:absolute;
  left:0;
  right:0;
  bottom:-1px;
  height:2px;
  background:linear-gradient(90deg,var(--cyan),var(--violet) 55%,var(--orange));
  transform:scaleX(0);
  transform-origin:left center;
  pointer-events:none;
}

/* ---------- 页脚 ---------- */
.site-footer{
  background:var(--ink);
  border-top:1px solid var(--edge);
  color:var(--paper);
  padding-top:clamp(40px,6vw,76px);
}
.footer-grid{
  display:grid;
  grid-template-columns:1.5fr 1fr 1fr 1.7fr;
  gap:clamp(24px,3vw,52px);
  padding-bottom:clamp(30px,4vw,56px);
}
.footer-brand__name{
  font-size:18px;
  font-weight:800;
  letter-spacing:-.01em;
}
.footer-brand__line{
  font-family:var(--mono);
  font-size:12px;
  letter-spacing:.22em;
  color:var(--rock);
  margin-top:10px;
}
.footer-brand__cta{margin-top:20px}
.footer-title{
  font-family:var(--mono);
  font-size:12px;
  font-weight:500;
  letter-spacing:.26em;
  color:var(--clay);
  margin-bottom:14px;
  text-transform:uppercase;
}
.footer-list{
  display:flex;
  flex-direction:column;
  gap:9px;
}
.footer-list a{
  font-size:14px;
  color:var(--rock);
  text-decoration:none;
  border-left:2px solid transparent;
  padding-left:0;
  transition:color .18s var(--ease),border-color .18s var(--ease),padding-left .18s var(--ease);
}
.footer-list a:hover{color:var(--cyan);border-left-color:var(--cyan);padding-left:8px}
.footer-list--contact{gap:12px}
.contact-row{
  display:flex;
  align-items:center;
  flex-wrap:wrap;
  gap:8px;
}
.contact-row__key{
  font-family:var(--mono);
  font-size:11px;
  letter-spacing:.16em;
  color:var(--clay);
  min-width:44px;
}
.contact-row__val{
  font-size:14px;
  color:var(--paper);
  word-break:break-all;
}
.copy-btn{
  font-family:var(--mono);
  font-size:11px;
  letter-spacing:.1em;
  padding:3px 9px;
  background:transparent;
  color:var(--rock);
  border:1px solid var(--edge-soft);
  border-radius:2px;
  cursor:pointer;
  transition:color .18s var(--ease),border-color .18s var(--ease),background-color .18s var(--ease);
}
.copy-btn:hover{color:var(--cyan);border-color:var(--cyan)}
.copy-btn.is-copied{background:var(--proof);border-color:var(--proof);color:var(--ink)}
.footer-bottom{
  display:flex;
  flex-wrap:wrap;
  justify-content:space-between;
  align-items:center;
  gap:12px;
  border-top:1px dashed var(--edge-soft);
  padding-block:22px 30px;
}
.footer-legal,
.footer-service{
  font-family:var(--mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--rock);
}
.footer-service{max-width:56ch;text-align:right}

/* ---------- 响应式 ---------- */
@media (max-width:1080px){
  .col-main{grid-column:2 / span 8}
  .col-aside{grid-column:10 / span 3}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
}
@media (max-width:980px){
  .canvas{grid-template-columns:repeat(6,minmax(0,1fr))}
  .col-rail,.col-main,.col-aside,.col-wide,.col-full{grid-column:1 / -1}
  .rail-note{writing-mode:horizontal-tb;letter-spacing:.24em}
}
@media (max-width:860px){
  body{font-size:16px}
  .masthead{
    grid-template-columns:1fr auto;
    padding-block:12px 10px;
  }
  .masthead__tagline{display:none}
  .masthead__brand{justify-self:start}
  .masthead__sub{display:none}
  .masthead__utility{grid-column:2;}
  .utility-link:not(.utility-link--signal){display:none}
  .nav-toggle{
    display:inline-flex;
    position:absolute;
    right:0;
    top:50%;
    transform:translateY(-50%);
  }
  .masthead__utility{padding-right:96px}
  .nav-bar{
    display:none;
    position:absolute;
    left:calc(var(--gut) * -1);
    right:calc(var(--gut) * -1);
    top:100%;
    background:var(--tunnel);
    border-top:1px solid var(--edge-soft);
    border-bottom:1px solid var(--edge);
    box-shadow:0 22px 44px rgba(0,0,0,.45);
  }
  .nav-bar[data-open]{display:block}
  .nav-list{
    flex-direction:column;
    align-items:stretch;
    gap:0;
    width:auto;
    padding:6px var(--gut) 20px;
  }
  .nav-link{
    display:block;
    padding:15px 4px;
    font-size:16px;
    border-bottom:1px dashed var(--edge-soft);
  }
  .nav-link::after{left:0;right:auto;width:22px;bottom:-1px}
  .nav-item:last-child .nav-link{border-bottom:0}
  .footer-service{text-align:left}
}
@media (max-width:600px){
  .footer-grid{grid-template-columns:1fr;gap:28px}
  .footer-bottom{flex-direction:column;align-items:flex-start}
  .path-strip__item{flex:1 1 100%;border-right:0;border-bottom:1px solid var(--edge-soft)}
  .path-strip__item:last-child{border-bottom:0}
  .section-head__meta{margin-left:0;flex-basis:100%}
  .btn{width:100%;justify-content:center}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  [data-reveal]{opacity:1;transform:none;transition:opacity .2s linear}
  .scroll-progress{transition:none}
}