:root{
  --ink-950:#0A1230;
  --ink-900:#101A3D;
  --ink-800:#18244F;
  --line:#2A3766;
  --muted:#94A0CC;
  --white:#EDF1FF;
  --cyan:#22D3EE;
  --orange:#FF7A1A;
  --violet:#8B7BFF;
  --green:#3DD68C;
  --amber:#FFC24B;
  --sans:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  --mono:ui-monospace,"JetBrains Mono","IBM Plex Mono",SFMono-Regular,Menlo,Consolas,monospace;
  --ease:cubic-bezier(.2,.7,.2,1);
  --container:1280px;
  --gutter:24px;
}

*,*::before,*::after{box-sizing:border-box;}
html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:180px;
}
body{
  margin:0;
  background:var(--ink-950);
  color:var(--white);
  font-family:var(--sans);
  font-size:16px;
  line-height:1.9;
  -webkit-font-smoothing:antialiased;
}
img,svg{max-width:100%;height:auto;}
button{font:inherit;color:inherit;}
[hidden]{display:none !important;}

a{color:#A9B6E8;text-decoration:none;transition:color .2s var(--ease);}
a:hover{color:var(--cyan);}

h1,h2,h3,h4{margin:0 0 .6em;font-weight:700;line-height:1.25;letter-spacing:-.01em;}
p{margin:0 0 1em;}
ul,ol{margin:0 0 1em;padding-left:1.2em;}

:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;}

/* ---------- 通用工具 ---------- */
.mono{font-family:var(--mono);font-variant-numeric:tabular-nums;letter-spacing:.06em;}

.wrap{
  width:100%;
  max-width:var(--container);
  margin:0 auto;
  padding:0 var(--gutter);
}

.grid-12{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:var(--gutter);}

.grid{display:grid;gap:var(--gutter);}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr));}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr));}

.panel{
  position:relative;
  background:var(--ink-900);
  border:1px solid var(--line);
  padding:26px;
  clip-path:polygon(0 0,calc(100% - 20px) 0,100% 20px,100% 100%,0 100%);
}

/* ---------- 排版组件 ---------- */
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-family:var(--mono);
  font-size:.72rem;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--muted);
  margin:0 0 14px;
}
.eyebrow::before{
  content:"";
  width:26px;height:1px;
  background:currentColor;
  opacity:.7;
}

.page-head{padding:44px 0 8px;}
.page-title{
  font-size:clamp(30px,4.4vw,60px);
  font-weight:700;
  letter-spacing:.01em;
  line-height:1.05;
  margin:0 0 18px;
}
.lede{
  max-width:38em;
  color:#C3CCEE;
  font-size:1.02rem;
  line-height:1.95;
  margin:0;
}

.section{padding:48px 0;}
.section + .section{border-top:1px solid rgba(42,55,102,.7);}

/* ---------- 按钮与胶囊 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.5em;
  min-height:44px;
  padding:10px 20px;
  border:1px solid var(--line);
  background:var(--ink-800);
  color:var(--white);
  font-size:.95rem;
  font-weight:600;
  letter-spacing:.02em;
  text-decoration:none;
  cursor:pointer;
  clip-path:polygon(10px 0,100% 0,100% calc(100% - 10px),calc(100% - 10px) 100%,0 100%,0 10px);
  transition:background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease);
}
.btn:hover{background:#22315F;color:var(--white);}
.btn--cyan{
  background:var(--cyan);
  border-color:var(--cyan);
  color:#041024;
}
.btn--cyan:hover{background:#5CE7F7;border-color:#5CE7F7;color:#041024;}
.btn--orange{
  background:var(--orange);
  border-color:var(--orange);
  color:#1B0A00;
}
.btn--orange:hover{background:#FF9445;border-color:#FF9445;color:#1B0A00;}
.btn--sm{
  min-height:38px;
  padding:7px 14px;
  font-size:.84rem;
  letter-spacing:.04em;
}

.pill{
  display:inline-flex;
  align-items:center;
  gap:.4em;
  padding:.1em .55em;
  border:1px solid var(--line);
  border-radius:2px;
  background:rgba(24,36,79,.65);
  font-family:var(--mono);
  font-size:.76rem;
  line-height:1.7;
  letter-spacing:.08em;
  color:var(--muted);
  white-space:nowrap;
}
.pill--cyan{color:var(--cyan);border-color:rgba(34,211,238,.45);background:rgba(34,211,238,.09);}
.pill--orange{color:var(--orange);border-color:rgba(255,122,26,.45);background:rgba(255,122,26,.09);}
.pill--violet{color:var(--violet);border-color:rgba(139,123,255,.45);background:rgba(139,123,255,.09);}
.pill--green{color:var(--green);border-color:rgba(61,214,140,.45);background:rgba(61,214,140,.1);}
.pill--amber{color:var(--amber);border-color:rgba(255,194,75,.45);background:rgba(255,194,75,.1);}

/* ---------- 面包屑 ---------- */
.breadcrumb{
  margin:22px 0 0;
  font-family:var(--mono);
  font-size:.74rem;
  letter-spacing:.08em;
}
.breadcrumb__list{
  list-style:none;
  display:flex;
  flex-wrap:wrap;
  gap:6px;
  margin:0;
  padding:0;
  color:var(--muted);
}
.breadcrumb__list li + li::before{
  content:"/";
  margin-right:6px;
  color:#3B4B85;
}
.breadcrumb__list a{color:var(--muted);}
.breadcrumb__list a:hover{color:var(--cyan);}
.breadcrumb__list [aria-current="page"]{color:var(--white);}

/* ---------- 图片容器基础 ---------- */
.media-frame{
  position:relative;
  display:block;
  margin:0;
  background:linear-gradient(160deg,#15214C 0%,#0B1434 55%,#0A1230 100%);
  border:1px solid var(--line);
  overflow:hidden;
  clip-path:polygon(0 0,calc(100% - 22px) 0,100% 22px,100% 100%,0 100%);
}
.media-frame::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background-image:
    linear-gradient(rgba(34,211,238,.07) 1px,transparent 1px),
    linear-gradient(90deg,rgba(34,211,238,.07) 1px,transparent 1px);
  background-size:32px 32px;
  opacity:.75;
}
.media-frame img{
  display:block;
  width:100%;
  height:auto;
  aspect-ratio:16 / 10;
  object-fit:cover;
}
.media-frame--wide img{aspect-ratio:21 / 9;}
.media-frame--square img{aspect-ratio:1 / 1;}
.media-frame--portrait img{aspect-ratio:3 / 4;}
.media-frame__caption{
  padding:12px 16px;
  border-top:1px solid rgba(42,55,102,.8);
  background:rgba(10,18,48,.6);
  color:var(--muted);
  font-family:var(--mono);
  font-size:.74rem;
  letter-spacing:.08em;
}

/* ---------- 章节索引（页面级使用） ---------- */
[data-section-link]{
  display:block;
  padding:8px 12px;
  border-left:2px solid var(--line);
  color:var(--muted);
  font-size:.9rem;
  line-height:1.6;
  transition:color .2s var(--ease),border-color .2s var(--ease),background .2s var(--ease);
}
[data-section-link]:hover{color:var(--white);border-left-color:#4A5A96;}
[data-section-link][aria-current]{
  color:var(--white);
  border-left-color:var(--cyan);
  background:linear-gradient(90deg,rgba(34,211,238,.16),transparent);
}

/* ================= 头部 ================= */
.site-header{
  position:sticky;
  top:0;
  z-index:80;
  background:var(--ink-950);
  border-bottom:1px solid var(--line);
  color:var(--white);
}

.skip-link{
  position:fixed;
  top:10px;
  left:10px;
  z-index:200;
  transform:translateY(-180%);
  padding:10px 18px;
  background:var(--cyan);
  color:#041024;
  font-weight:700;
  text-decoration:none;
  clip-path:polygon(8px 0,100% 0,100% calc(100% - 8px),calc(100% - 8px) 100%,0 100%,0 8px);
  transition:transform .2s var(--ease);
}
.skip-link:focus{transform:translateY(0);color:#041024;}

.status-strip{
  background:#070D24;
  border-bottom:1px solid rgba(42,55,102,.8);
}
.status-strip__inner{
  max-width:var(--container);
  margin:0 auto;
  padding:6px var(--gutter);
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:18px;
  flex-wrap:wrap;
  font-family:var(--mono);
  font-size:.7rem;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--muted);
}
.status-strip__item{display:inline-flex;align-items:center;gap:8px;}
.status-strip__key{color:#63709F;}
.status-strip__val{color:#C3CCEE;}

.masthead{
  max-width:var(--container);
  margin:0 auto;
  padding:0 var(--gutter);
}
.masthead__inner{
  display:grid;
  grid-template-columns:1fr auto 1fr;
  align-items:center;
  gap:16px;
  padding:14px 0 12px;
}
.masthead__side{
  margin:0;
  font-family:var(--mono);
  font-size:.72rem;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--muted);
}
.masthead__brand{
  justify-self:center;
  position:relative;
  font-size:clamp(24px,3.2vw,38px);
  font-weight:700;
  line-height:1;
  letter-spacing:.3em;
  text-indent:.3em;
  white-space:nowrap;
  color:var(--white);
  text-decoration:none;
}
.masthead__brand::after{
  content:"";
  position:absolute;
  left:0;right:.3em;
  bottom:-8px;
  height:2px;
  background:linear-gradient(90deg,var(--cyan),var(--violet) 55%,transparent);
  opacity:.85;
}
.masthead__brand:hover{color:var(--white);}
.masthead__tools{
  justify-self:end;
  display:flex;
  align-items:center;
  gap:10px;
}

.rule-scale{
  height:10px;
  border-bottom:1px solid var(--line);
  background-image:repeating-linear-gradient(90deg,rgba(148,160,204,.4) 0 1px,transparent 1px 20px);
  background-position:left top;
  background-repeat:repeat-x;
  background-size:20px 10px;
}

.nav-toggle{
  display:none;
  align-items:center;
  gap:8px;
  min-height:44px;
  min-width:44px;
  padding:8px 14px;
  background:var(--ink-800);
  border:1px solid var(--line);
  color:var(--white);
  font-family:var(--mono);
  font-size:.74rem;
  letter-spacing:.14em;
  cursor:pointer;
  clip-path:polygon(8px 0,100% 0,100% calc(100% - 8px),calc(100% - 8px) 100%,0 100%,0 8px);
}
.nav-toggle__bars{
  display:block;
  position:relative;
  width:16px;
  height:2px;
  background:var(--cyan);
  transition:background .2s var(--ease);
}
.nav-toggle__bars::before,
.nav-toggle__bars::after{
  content:"";
  position:absolute;
  left:0;
  width:16px;
  height:2px;
  background:var(--cyan);
  transition:background .2s var(--ease);
}
.nav-toggle__bars::before{top:-5px;}
.nav-toggle__bars::after{top:5px;}
.nav-toggle[aria-expanded="true"]{border-color:rgba(34,211,238,.6);}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars,
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before,
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{
  background:var(--orange);
}

.site-nav{
  border-top:1px solid rgba(42,55,102,.6);
  background:rgba(16,26,61,.85);
}
.site-nav__list{
  max-width:var(--container);
  margin:0 auto;
  padding:0 var(--gutter);
  list-style:none;
  display:grid;
  grid-template-columns:repeat(6,minmax(0,1fr));
  gap:1px;
}
.site-nav__item{--accent:#3E4E8C;}
.site-nav__item[data-tone="cyan"]{--accent:var(--cyan);}
.site-nav__item[data-tone="violet"]{--accent:var(--violet);}
.site-nav__item[data-tone="orange"]{--accent:var(--orange);}
.site-nav__item[data-tone="ink"]{--accent:#3E4E8C;}

.site-nav__item a{
  position:relative;
  display:flex;
  align-items:center;
  gap:9px;
  min-height:54px;
  padding:12px 8px;
  color:var(--muted);
  font-size:.9rem;
  border-bottom:2px solid transparent;
  transition:color .2s var(--ease),border-color .2s var(--ease),background .2s var(--ease);
}
.site-nav__item a::before{
  content:"";
  position:absolute;
  top:0;left:0;right:0;
  height:3px;
  background:var(--accent);
  opacity:.4;
  transition:opacity .2s var(--ease);
}
.site-nav__item a:hover{
  color:var(--white);
  background:rgba(24,36,79,.6);
}
.site-nav__item a:hover::before{opacity:1;}
.site-nav__item a[aria-current="page"]{
  color:var(--white);
  border-bottom-color:var(--accent);
  background:rgba(24,36,79,.55);
}
.site-nav__item a[aria-current="page"]::before{opacity:1;}
.site-nav__num{
  font-size:.72rem;
  color:var(--accent);
  letter-spacing:.1em;
}
.site-nav__label{white-space:nowrap;}

.scroll-meter{
  position:absolute;
  left:0;right:0;bottom:-1px;
  height:2px;
  background:rgba(42,55,102,.55);
  overflow:hidden;
  pointer-events:none;
}
.scroll-meter i{
  display:block;
  height:100%;
  width:0;
  background:linear-gradient(90deg,var(--cyan),var(--violet));
}

/* ================= 页脚 ================= */
.site-footer{
  margin-top:80px;
  background:linear-gradient(180deg,#070D24 0%,var(--ink-950) 100%);
  border-top:1px solid var(--line);
  color:var(--muted);
}
.footer-scale{
  height:8px;
  background-image:repeating-linear-gradient(90deg,rgba(148,160,204,.32) 0 1px,transparent 1px 16px);
  background-repeat:repeat-x;
  background-size:16px 8px;
  border-bottom:1px solid rgba(42,55,102,.7);
}
.footer__inner{
  max-width:var(--container);
  margin:0 auto;
  padding:52px var(--gutter) 20px;
  display:grid;
  grid-template-columns:1.5fr 1fr 1fr 1.5fr;
  gap:40px 32px;
}
.footer__col{min-width:0;}
.footer__brand{
  display:inline-block;
  font-size:22px;
  font-weight:700;
  letter-spacing:.24em;
  text-indent:.24em;
  color:var(--white);
  text-decoration:none;
  margin-bottom:14px;
}
.footer__brand:hover{color:var(--cyan);}
.footer__note{
  margin:0 0 12px;
  font-size:.88rem;
  line-height:1.85;
  color:var(--muted);
  max-width:34em;
}
.footer__ver{color:#6F7CAB;font-size:.76rem;letter-spacing:.12em;}
.footer__title{
  margin:0 0 14px;
  font-family:var(--mono);
  font-size:.72rem;
  font-weight:400;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:#6F7CAB;
}
.footer__list{
  list-style:none;
  margin:0;
  padding:0;
  display:grid;
  gap:9px;
  font-size:.9rem;
}
.footer__list a{
  color:#C3CCEE;
  border-bottom:1px solid transparent;
  padding-bottom:1px;
}
.footer__list a:hover{
  color:var(--cyan);
  border-bottom-color:rgba(34,211,238,.6);
}
.footer__list--plain{gap:12px;}
.footer__list--plain li{
  display:grid;
  grid-template-columns:3.2em 1fr;
  gap:10px;
  align-items:start;
  line-height:1.75;
  overflow-wrap:anywhere;
}
.footer__key{
  font-family:var(--mono);
  font-size:.7rem;
  letter-spacing:.1em;
  color:#6F7CAB;
  padding-top:.25em;
}
.footer__val{color:#C3CCEE;}
.footer__tip{
  margin:16px 0 0;
  padding-top:12px;
  border-top:1px solid rgba(42,55,102,.7);
  font-size:.8rem;
  line-height:1.75;
  color:#6F7CAB;
}
.footer__bottom{
  max-width:var(--container);
  margin:0 auto;
  padding:16px var(--gutter) 30px;
  border-top:1px solid rgba(42,55,102,.7);
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:14px;
  flex-wrap:wrap;
  font-size:.78rem;
  color:#6F7CAB;
}
.footer__copy,
.footer__icp{margin:0;letter-spacing:.06em;}
.footer__icp{font-size:.74rem;}

/* ================= 响应式 ================= */
@media (max-width:1080px){
  .footer__inner{grid-template-columns:1fr 1fr;gap:36px 28px;}
  .site-nav__item a{font-size:.84rem;padding:12px 6px;}
  .site-nav__item a::before{opacity:.3;}
}

@media (max-width:900px){
  html{scroll-padding-top:150px;}
  .nav-toggle{display:inline-flex;}
  .site-nav{
    display:none;
    border-top:1px solid var(--line);
    background:#0C1536;
  }
  .site-header[data-open="true"] .site-nav{display:block;}
  .site-nav__list{
    grid-template-columns:1fr;
    gap:0;
    padding:0 16px 10px;
  }
  .site-nav__item a{
    min-height:50px;
    padding:14px 10px;
    font-size:.98rem;
    border-bottom:1px solid rgba(42,55,102,.55);
  }
  .site-nav__item a::before{
    top:8px;bottom:8px;right:auto;
    width:3px;
    height:auto;
  }
  .site-nav__label{white-space:normal;}
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr));}
  .grid-12{grid-template-columns:repeat(6,minmax(0,1fr));}
}

@media (max-width:760px){
  :root{--gutter:18px;}
  .status-strip__inner{
    justify-content:flex-start;
    gap:14px;
    font-size:.64rem;
    letter-spacing:.1em;
  }
  .status-strip__item:nth-child(3){display:none;}
  .masthead__inner{
    grid-template-columns:1fr auto;
    gap:10px;
    padding:12px 0 10px;
  }
  .masthead__side{display:none;}
  .masthead__brand{
    justify-self:start;
    letter-spacing:.18em;
    text-indent:.18em;
    font-size:25px;
  }
  .masthead__tools .pill{display:none;}
  .masthead__tools{gap:8px;}
  .btn--sm{min-height:38px;padding:7px 11px;font-size:.78rem;}
  .page-head{padding:32px 0 4px;}
  .section{padding:36px 0;}
  .grid--2,.grid--3{grid-template-columns:1fr;}
  .grid-12{grid-template-columns:repeat(2,minmax(0,1fr));}
  .panel{padding:18px;}
  .footer__inner{grid-template-columns:1fr;gap:30px;padding-top:38px;}
  .footer__bottom{flex-direction:column;align-items:flex-start;gap:6px;}
}

@media (max-width:420px){
  .masthead__brand{font-size:22px;}
  .nav-toggle{padding:8px 10px;font-size:.68rem;}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
}