:root{
  --night:#06090F;
  --deep:#0D1322;
  --line:#1E2736;
  --moon:#F2F5FA;
  --silver:#C6D2E2;
  --grey:#7E8CA2;
  --signal:#FF7A29;
  --amber:#FFB35C;
  --ochre:#A85F3A;
  --ok:#4ED08A;
  --track:#3FBFB0;
  --ink:#0A0D14;
  --font-display:"PingFang SC","Helvetica Neue","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-mono:"SFMono-Regular","Roboto Mono",Consolas,"Liberation Mono",Menlo,monospace;
  --w-wide:1240px;
  --gutter:clamp(16px,4vw,40px);
  --ease:200ms cubic-bezier(.4,0,.2,1);
  --radius-organic:22px 6px 26px 10px;
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;background:var(--night)}
body,h1,h2,h3,h4,p,ul,ol,li,figure,blockquote,fieldset{margin:0;padding:0}
ul,ol{list-style:none}
img,svg,video{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
table{border-collapse:collapse;width:100%}

body{
  min-height:100vh;
  background:var(--night);
  color:var(--silver);
  font-family:var(--font-body);
  font-size:16.5px;
  line-height:1.75;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:-1;
  pointer-events:none;
  background-image:
    radial-gradient(1.6px 1.6px at 8% 14%, rgba(198,210,226,.42), transparent 62%),
    radial-gradient(1.4px 1.4px at 27% 42%, rgba(198,210,226,.3), transparent 62%),
    radial-gradient(1.8px 1.8px at 62% 9%, rgba(255,179,92,.42), transparent 62%),
    radial-gradient(1.4px 1.4px at 78% 32%, rgba(198,210,226,.28), transparent 62%),
    radial-gradient(1.6px 1.6px at 91% 62%, rgba(198,210,226,.34), transparent 62%),
    radial-gradient(1.3px 1.3px at 44% 78%, rgba(255,122,41,.28), transparent 62%),
    radial-gradient(1.4px 1.4px at 16% 88%, rgba(198,210,226,.24), transparent 62%);
}

h1,h2,h3,h4{
  font-family:var(--font-display);
  font-stretch:condensed;
  color:var(--moon);
  font-weight:700;
  line-height:1.2;
  letter-spacing:.05em;
}
h1{font-size:clamp(2rem,4vw,3.4rem)}
h2{font-size:clamp(1.4rem,2.6vw,2.1rem)}
h3{font-size:clamp(1.1rem,1.8vw,1.35rem)}
h4{font-size:1.02rem}
p{max-width:68ch}
strong{color:var(--moon);font-weight:600}

:focus-visible{outline:2px solid var(--amber);outline-offset:3px;border-radius:2px}
::selection{background:rgba(255,122,41,.34);color:var(--moon)}

/* ---------- 通用结构 ---------- */
.container{width:100%;max-width:var(--w-wide);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-block:clamp(44px,7vw,96px)}
.section--tight{padding-block:clamp(24px,4vw,52px)}
.prose{max-width:68ch;color:var(--silver)}
.prose p+p{margin-top:1.2em}
.prose h2{margin-top:1.6em;margin-bottom:.6em}
.prose h3{margin-top:1.4em;margin-bottom:.5em}
.prose ul{margin-top:.8em;padding-left:1.1em;list-style:none}
.prose ul li{position:relative;padding-left:14px}
.prose ul li::before{content:"";position:absolute;left:0;top:.72em;width:6px;height:6px;border-radius:50%;background:var(--signal)}

.grid{display:grid;gap:clamp(18px,2.4vw,32px)}
.grid--12{grid-template-columns:repeat(12,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--auto{grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}
.col-3{grid-column:span 3}
.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}
.col-12{grid-column:span 12}

.rule{height:1px;border:0;background:var(--line);margin:clamp(26px,4vw,54px) 0}
.rule--signal{background:linear-gradient(90deg,var(--signal),rgba(30,39,54,0))}

/* ---------- 夜航标记 ---------- */
.eyebrow{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.2em;
  color:var(--grey);
  text-transform:uppercase;
  margin-bottom:12px;
}
.chapter-no{
  display:inline-block;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.14em;
  background:var(--ochre);
  color:#0B0E14;
  padding:3px 9px;
  border-radius:2px;
}
.mono{font-family:var(--font-mono);font-size:12.5px;letter-spacing:.06em}
.note-vertical{
  writing-mode:vertical-rl;
  text-orientation:mixed;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.22em;
  color:var(--grey);
}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  gap:10px;
  padding:12px 22px;
  border-radius:999px;
  border:1px solid transparent;
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.08em;
  cursor:pointer;
  transition:background var(--ease),color var(--ease),border-color var(--ease),transform var(--ease);
}
.btn--primary{background:var(--signal);color:var(--ink);font-weight:700}
.btn--primary:hover{background:var(--amber)}
.btn--ghost{border-color:var(--line);color:var(--silver)}
.btn--ghost:hover{border-color:var(--signal);color:var(--moon)}
.btn--quiet{color:var(--amber);padding-inline:4px}
.btn--quiet:hover{color:var(--moon)}

/* ---------- 面包屑 ---------- */
.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--grey);
}
.breadcrumb li{display:flex;align-items:center;gap:8px}
.breadcrumb li+li::before{content:"/";color:var(--ochre)}
.breadcrumb a{color:var(--silver);border-bottom:1px solid transparent;transition:color var(--ease),border-color var(--ease)}
.breadcrumb a:hover{color:var(--amber);border-bottom-color:var(--amber)}
.breadcrumb [aria-current="page"]{color:var(--moon)}

/* ---------- 面板与路标卡 ---------- */
.panel{
  position:relative;
  background:var(--deep);
  border:1px solid var(--line);
  border-radius:var(--radius-organic);
  padding:clamp(18px,2.4vw,28px);
}
.panel--marker{transition:border-color var(--ease),transform var(--ease)}
.panel--marker::before{
  content:"";
  position:absolute;
  left:-1px;
  top:24px;
  width:3px;
  height:26px;
  background:var(--ochre);
  border-radius:0 3px 3px 0;
}
.panel--marker:hover{border-color:var(--signal);transform:translateY(-3px)}

/* ---------- 图例与状态灯 ---------- */
.legend{
  display:flex;
  flex-wrap:wrap;
  gap:10px 22px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--grey);
}
.legend-item{display:inline-flex;align-items:center;gap:8px}
.legend-key{width:10px;height:10px;border-radius:50%;background:var(--signal);flex:0 0 auto}
.legend-key--ring{background:transparent;border:1px solid var(--grey)}
.legend-key--square{border-radius:2px;background:var(--ochre)}

.status-light{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--silver);
}
.status-light::before{
  content:"";
  width:8px;
  height:8px;
  border-radius:50%;
  background:var(--grey);
  box-shadow:0 0 0 3px rgba(126,140,162,.14);
  flex:0 0 auto;
}
.status-light--ok::before{background:var(--ok);box-shadow:0 0 0 3px rgba(78,208,138,.16)}
.status-light--track::before{background:var(--track);box-shadow:0 0 0 3px rgba(63,191,176,.16)}

/* ---------- 图片容器 ---------- */
.media-frame{
  position:relative;
  display:block;
  width:100%;
  aspect-ratio:16/9;
  overflow:hidden;
  border:1px solid var(--line);
  border-radius:var(--radius-organic);
  background:
    radial-gradient(120% 90% at 82% 0%, rgba(255,122,41,.18), transparent 62%),
    linear-gradient(160deg,var(--deep) 0%,var(--night) 72%);
}
.media-frame img{width:100%;height:100%;object-fit:cover}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--tall{aspect-ratio:4/5}
.media-frame--square{aspect-ratio:1/1}
.media-frame figcaption{
  position:absolute;
  left:0;
  right:0;
  bottom:0;
  margin:0;
  padding:14px 18px;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.08em;
  color:var(--silver);
  background:linear-gradient(180deg,rgba(6,9,15,0),rgba(6,9,15,.88));
}

/* ---------- 滚动进度 ---------- */
.progress-bar{
  position:absolute;
  left:0;
  bottom:-1px;
  width:100%;
  height:2px;
  background:linear-gradient(90deg,var(--signal),var(--amber));
  transform:scaleX(0);
  transform-origin:0 50%;
  pointer-events:none;
}

/* ---------- 显现 ---------- */
.js .reveal{opacity:0;transform:translateY(16px);transition:opacity 320ms ease,transform 320ms ease}
.js .reveal.is-visible{opacity:1;transform:none}

/* ---------- 页头 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:60;
  background:rgba(6,9,15,.94);
  border-bottom:1px solid var(--line);
  color:var(--silver);
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
}
.skip-link{
  position:absolute;
  left:var(--gutter);
  top:-120px;
  z-index:80;
  background:var(--signal);
  color:var(--ink);
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.06em;
  padding:10px 16px;
  border-radius:2px;
  transition:top var(--ease);
}
.skip-link:focus{top:12px}
.header-inner{width:100%;max-width:var(--w-wide);margin-inline:auto;padding-inline:var(--gutter)}
.header-top{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:20px;
  padding:14px 0 12px;
}
.brand-mark{display:flex;align-items:center;gap:12px;min-width:0}
.brand-sigil{
  display:grid;
  place-items:center;
  width:34px;
  height:34px;
  flex:0 0 auto;
  background:var(--ochre);
  color:var(--moon);
  font-family:var(--font-mono);
  font-size:15px;
  border-radius:14px 4px 16px 6px;
  border:1px solid rgba(255,179,92,.42);
}
.brand-text{display:flex;flex-direction:column;min-width:0}
.brand-name{
  font-family:var(--font-display);
  font-stretch:condensed;
  font-size:1.06rem;
  font-weight:700;
  letter-spacing:.16em;
  color:var(--moon);
  line-height:1.3;
}
.brand-line{
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.08em;
  color:var(--grey);
  line-height:1.5;
  white-space:nowrap;
  overflow:hidden;
  text-overflow:ellipsis;
}
.header-utility{display:flex;align-items:center;gap:8px;flex:0 0 auto}
.util-link{
  display:inline-flex;
  align-items:center;
  padding:7px 14px;
  border:1px solid var(--line);
  border-radius:999px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--silver);
  white-space:nowrap;
  transition:border-color var(--ease),color var(--ease),background var(--ease);
}
.util-link:hover{border-color:var(--signal);color:var(--moon)}
.util-link--accent{background:var(--signal);border-color:var(--signal);color:var(--ink);font-weight:700}
.util-link--accent:hover{background:var(--amber);border-color:var(--amber);color:var(--ink)}
.nav-toggle{
  display:none;
  align-items:center;
  gap:9px;
  padding:7px 14px;
  border:1px solid var(--line);
  border-radius:999px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.1em;
  color:var(--silver);
  transition:border-color var(--ease),color var(--ease);
}
.nav-toggle:hover{border-color:var(--signal);color:var(--moon)}
.nav-toggle-bars{display:grid;gap:3px;width:16px}
.nav-toggle-bars span{
  display:block;
  height:1.5px;
  background:currentColor;
  transition:transform var(--ease),opacity var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(1){transform:translateY(4.5px) 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(-4.5px) rotate(-45deg)}
.nav-bar{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:24px;
  border-top:1px solid var(--line);
}
.site-nav{min-width:0}
.nav-list{display:flex;align-items:center;gap:clamp(18px,2.4vw,34px)}
.nav-item{display:flex}
.nav-link{
  position:relative;
  display:inline-flex;
  align-items:center;
  gap:9px;
  padding:15px 0;
  font-family:var(--font-mono);
  font-size:12.5px;
  letter-spacing:.1em;
  color:var(--silver);
  white-space:nowrap;
  transition:color var(--ease);
}
.nav-link::after{
  content:"";
  position:absolute;
  left:0;
  right:0;
  bottom:9px;
  height:2px;
  background:var(--signal);
  transform:scaleX(0);
  transform-origin:0 50%;
  transition:transform var(--ease);
}
.nav-link:hover{color:var(--moon)}
.nav-link:hover::after{transform:scaleX(1)}
.nav-dot{
  width:7px;
  height:7px;
  flex:0 0 auto;
  border-radius:50%;
  border:1px solid #3A4759;
  background:transparent;
  transition:background var(--ease),border-color var(--ease),box-shadow var(--ease);
}
.nav-link:hover .nav-dot{background:var(--amber);border-color:var(--amber)}
.nav-link[aria-current="page"]{color:var(--moon);font-weight:700}
.nav-link[aria-current="page"]::after{transform:scaleX(1)}
.nav-link[aria-current="page"] .nav-dot{
  background:var(--signal);
  border-color:var(--signal);
  box-shadow:0 0 0 4px rgba(255,122,41,.16);
}
.nav-coord{
  display:flex;
  align-items:center;
  gap:14px;
  color:var(--grey);
  font-size:11px;
  letter-spacing:.12em;
  white-space:nowrap;
}
.nav-coord span+span{padding-left:14px;border-left:1px solid var(--line)}

/* ---------- 页脚 ---------- */
.site-footer{
  margin-top:clamp(56px,9vw,132px);
  background:var(--deep);
  border-top:1px solid var(--line);
  color:var(--silver);
}
.footer-inner{
  position:relative;
  width:100%;
  max-width:var(--w-wide);
  margin-inline:auto;
  padding:clamp(34px,5.5vw,72px) var(--gutter) 26px;
}
.footer-inner::before{
  content:"";
  position:absolute;
  left:var(--gutter);
  top:clamp(18px,3vw,34px);
  width:46px;
  height:4px;
  background:var(--ochre);
  border-radius:2px;
}
.footer-main{
  display:grid;
  grid-template-columns:minmax(0,1.6fr) minmax(0,1fr) minmax(0,1fr) minmax(0,1.2fr);
  gap:clamp(22px,3.4vw,52px);
  padding-top:clamp(20px,3vw,34px);
}
.footer-brand{min-width:0}
.footer-sign{color:var(--ochre);letter-spacing:.2em;font-size:11px;margin-bottom:10px}
.footer-name{
  font-family:var(--font-display);
  font-stretch:condensed;
  font-size:1.5rem;
  font-weight:700;
  letter-spacing:.14em;
  color:var(--moon);
  margin-bottom:12px;
}
.footer-desc{font-size:14.5px;color:var(--silver);max-width:34ch}
.footer-coords{margin-top:14px;color:var(--grey);font-size:11.5px;letter-spacing:.12em}
.footer-block{min-width:0}
.footer-title{
  font-family:var(--font-mono);
  font-size:11.5px;
  font-weight:400;
  letter-spacing:.2em;
  color:var(--grey);
  text-transform:uppercase;
  margin-bottom:14px;
  padding-bottom:10px;
  border-bottom:1px solid var(--line);
}
.footer-links li+li{margin-top:10px}
.footer-links a{
  display:inline-block;
  font-size:14.5px;
  color:var(--silver);
  border-bottom:1px solid transparent;
  transition:color var(--ease),border-color var(--ease),transform var(--ease);
}
.footer-links a:hover{color:var(--amber);border-bottom-color:var(--amber);transform:translateX(3px)}
.footer-contact{font-size:14px;color:var(--silver);margin-bottom:8px;max-width:none}
.footer-contact .mono{color:var(--moon);letter-spacing:.04em}
.footer-bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  margin-top:clamp(28px,4vw,52px);
  padding-top:20px;
  border-top:1px solid var(--line);
}
.footer-legal{font-size:12.5px;color:var(--grey);letter-spacing:.04em;max-width:none}
.footer-copy{font-size:12px;color:var(--grey);letter-spacing:.08em}

/* ---------- 响应式 ---------- */
@media (max-width:1180px){
  .nav-coord{display:none}
}
@media (max-width:900px){
  body{font-size:16px}
  .nav-toggle{display:inline-flex}
  .header-inner{padding-inline:var(--gutter)}
  .nav-bar{flex-direction:column;align-items:stretch;gap:0}
  .site-nav{
    max-height:0;
    overflow:hidden;
    transition:max-height var(--ease);
  }
  .site-nav[data-open="true"]{max-height:64vh;overflow-y:auto}
  .nav-list{flex-direction:column;align-items:stretch;gap:0}
  .nav-link{
    width:100%;
    padding:14px 0;
    border-bottom:1px solid var(--line);
    font-size:13.5px;
  }
  .nav-link::after{display:none}
  .nav-link[aria-current="page"]{color:var(--signal)}
  .footer-main{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid--12{grid-template-columns:repeat(6,minmax(0,1fr))}
  .col-3,.col-4{grid-column:span 3}
  .col-5,.col-6,.col-7,.col-8{grid-column:span 6}
  .grid--3{grid-template-columns:1fr}
  .grid--2{grid-template-columns:1fr}
}
@media (max-width:640px){
  .brand-line{display:none}
  .util-link{padding:6px 11px;font-size:11px}
  .header-top{gap:12px;padding:12px 0 10px}
  .footer-main{grid-template-columns:1fr}
  .footer-inner::before{width:34px}
  .grid--12{grid-template-columns:1fr}
  .col-3,.col-4,.col-5,.col-6,.col-7,.col-8{grid-column:span 1}
  .grid--auto{grid-template-columns:1fr}
}

@media (prefers-reduced-motion: reduce){
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  .js .reveal{opacity:1;transform:none}
  .nav-link::after{transition:none}
  .panel--marker:hover{transform:none}
}