*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}

:root{
  --color-brand:#8B0000;
  --color-brand-deep:#5C0000;
  --color-accent:#DAA520;
  --color-accent-light:#E8C56B;
  --color-steel:#4B6E8C;
  --color-steel-light:#7B9CB0;
  --color-bg:#F8F4F0;
  --color-bg-alt:#EFEAE4;
  --color-ink:#2B2B2B;
  --color-muted:#6B6B6B;
  --color-line:#D6CEC6;
  --color-dark:#241F1C;
  --color-on-dark:#F8F4F0;
  --font-display:"Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --font-body:"Noto Serif SC","Songti SC","STSong","SimSun",serif;
  --font-mono:"Roboto Mono","SFMono-Regular",Consolas,"Liberation Mono",monospace;
  --max-width:1320px;
  --gutter:clamp(20px,4vw,48px);
  --section-space:clamp(72px,10vw,128px);
  --shadow:0 18px 36px rgba(43,43,43,.08)
}

html{scroll-behavior:smooth}

body{
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.7;
  color:var(--color-ink);
  background-color:var(--color-bg);
  background-image:linear-gradient(to right,rgba(139,0,0,.04) 1px,transparent 1px),linear-gradient(to bottom,rgba(139,0,0,.04) 1px,transparent 1px);
  background-size:56px 56px;
  -webkit-font-smoothing:antialiased
}

h1,h2,h3,h4{
  font-family:var(--font-display);
  font-weight:700;
  line-height:1.25;
  color:var(--color-ink)
}

p{margin-bottom:1em}
ul,ol{list-style:none;margin:0;padding:0}
a{color:var(--color-steel)}
img{display:block;max-width:100%}

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

::selection{
  background:var(--color-brand);
  color:var(--color-on-dark)
}

.skip-link{
  position:fixed;
  top:12px;
  left:12px;
  z-index:1000;
  display:inline-block;
  padding:12px 20px;
  background:var(--color-brand);
  color:var(--color-on-dark);
  font-family:var(--font-display);
  font-weight:700;
  font-size:14px;
  text-decoration:none;
  transform:translateY(-250%);
  transition:transform .2s ease
}

.skip-link:focus-visible{
  transform:translateY(0);
  color:var(--color-on-dark)
}

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

.content-body{
  max-width:68ch
}

.content-body p+p{
  margin-top:1em
}

.section-block{
  padding-block:var(--section-space)
}

.section-head{
  display:grid;
  gap:8px;
  margin-bottom:48px;
  max-width:78ch
}

.section-label{
  font-family:var(--font-mono);
  font-size:14px;
  letter-spacing:.08em;
  text-transform:uppercase;
  color:var(--color-accent)
}

.section-label::before{
  content:"// "
}

.section-title{
  font-family:var(--font-display);
  font-size:clamp(36px,5vw,60px);
  letter-spacing:-.02em;
  line-height:1.15
}

.section-lead{
  font-size:clamp(16px,2vw,20px);
  color:var(--color-muted)
}

.section-block--invert{
  background:var(--color-brand);
  color:var(--color-on-dark)
}

.section-block--invert .section-label{
  color:var(--color-accent-light)
}

.section-block--invert .section-title,
.section-block--invert h1,
.section-block--invert h2,
.section-block--invert h3,
.section-block--invert h4{
  color:var(--color-on-dark)
}

.section-block--invert .section-lead{
  color:rgba(248,244,240,.78)
}

.coord-tag{
  display:inline-block;
  padding:2px 8px;
  background:var(--color-accent);
  color:var(--color-ink);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  white-space:nowrap
}

.legend{
  display:flex;
  flex-wrap:wrap;
  gap:16px 24px;
  padding:16px 18px;
  border:1px solid var(--color-line);
  background:rgba(255,255,255,.45);
  font-family:var(--font-mono);
  font-size:12px
}

.legend-item{
  display:inline-flex;
  align-items:center;
  gap:8px
}

.legend-swatch{
  display:inline-block;
  width:12px;
  height:12px;
  box-shadow:0 0 0 1px rgba(0,0,0,.15)
}

.legend-swatch--brand{background:var(--color-brand)}
.legend-swatch--accent{background:var(--color-accent)}
.legend-swatch--steel{background:var(--color-steel)}

.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:14px 28px;
  border:1px solid transparent;
  border-radius:0;
  background:transparent;
  color:var(--color-ink);
  font-family:var(--font-display);
  font-size:15px;
  font-weight:700;
  text-decoration:none;
  cursor:pointer
}

.btn-primary{
  background:var(--color-brand);
  color:var(--color-on-dark)
}

.btn-primary:hover{
  background:var(--color-brand-deep);
  color:var(--color-on-dark)
}

.btn-ghost{
  border-color:var(--color-brand);
  color:var(--color-brand)
}

.btn-ghost:hover{
  background:var(--color-brand);
  color:var(--color-on-dark)
}

.section-block--invert .btn-ghost{
  border-color:var(--color-on-dark);
  color:var(--color-on-dark)
}

.section-block--invert .btn-ghost:hover{
  background:var(--color-on-dark);
  color:var(--color-brand)
}

.card-grid{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(280px,1fr));
  gap:clamp(16px,3vw,24px)
}

.card{
  display:flex;
  flex-direction:column;
  gap:12px;
  padding:28px;
  border:1px solid var(--color-line);
  border-top:4px solid transparent;
  background:rgba(255,255,255,.45);
  transition:box-shadow .3s ease,border-color .3s ease
}

.card:hover{
  border-top-color:var(--color-accent);
  box-shadow:var(--shadow)
}

.card-index{
  font-family:var(--font-mono);
  font-size:14px;
  color:var(--color-accent)
}

.card-title{
  font-family:var(--font-display);
  font-size:24px;
  color:var(--color-ink)
}

.card-desc{
  font-size:15px;
  color:var(--color-muted)
}

.card-link{
  align-self:flex-start;
  margin-top:auto;
  font-family:var(--font-display);
  font-size:14px;
  font-weight:700;
  color:var(--color-brand);
  text-decoration:none
}

.card-link::after{
  content:"→";
  margin-left:6px
}

.details,.fold{
  border:1px solid var(--color-line);
  background:rgba(255,255,255,.35)
}

.fold + .fold{
  border-top:0
}

.fold-header{
  display:flex;
  align-items:center;
  gap:16px;
  padding:18px 24px;
  cursor:pointer;
  font-family:var(--font-display);
  font-weight:700;
  color:var(--color-ink);
  list-style:none
}

.fold-header::-webkit-details-marker{
  display:none
}

.fold-header::after{
  content:"+";
  margin-left:auto;
  font-family:var(--font-mono);
  font-size:24px;
  line-height:1;
  color:var(--color-accent)
}

.fold[open] .fold-header::after{
  content:"−"
}

.fold-index{
  min-width:2ch;
  font-family:var(--font-mono);
  font-size:14px;
  color:var(--color-accent)
}

.fold-panel{
  padding:0 24px 26px 64px;
  color:var(--color-muted)
}

.index-list{
  border-bottom:1px solid var(--color-line)
}

.index-row{
  display:grid;
  grid-template-columns:88px 1fr 2fr 40px;
  column-gap:24px;
  align-items:baseline;
  padding:30px 0;
  border-top:1px solid var(--color-line);
  color:var(--color-ink);
  text-decoration:none
}

.index-row__num{
  font-family:var(--font-mono);
  font-size:14px;
  color:var(--color-accent)
}

.index-row__title{
  font-family:var(--font-display);
  font-size:clamp(20px,3vw,28px);
  font-weight:700
}

.index-row__desc{
  font-size:15px;
  color:var(--color-muted)
}

.index-row__arrow{
  justify-self:end;
  font-family:var(--font-mono);
  color:var(--color-brand);
  transition:transform .3s ease
}

.index-row:hover{
  color:var(--color-brand)
}

.index-row:hover .index-row__arrow{
  transform:translateX(6px)
}

.visual-frame{
  position:relative;
  overflow:hidden;
  aspect-ratio:16/9;
  border:1px solid var(--color-line);
  background:var(--color-bg-alt)
}

.visual-frame--portrait{
  aspect-ratio:4/5
}

.visual-frame--square{
  aspect-ratio:1/1
}

.visual-frame--map{
  background:var(--color-steel-light)
}

.visual-frame img{
  position:absolute;
  inset:0;
  width:100%;
  height:100%;
  object-fit:cover;
  z-index:0
}

.visual-frame::after{
  content:"";
  position:absolute;
  inset:0;
  z-index:1;
  pointer-events:none;
  background:linear-gradient(to right,rgba(139,0,0,.05) 1px,transparent 1px),linear-gradient(to bottom,rgba(139,0,0,.05) 1px,transparent 1px);
  background-size:24px 24px
}

.visual-frame__tag{
  position:absolute;
  left:14px;
  bottom:14px;
  z-index:2;
  padding:4px 10px;
  background:var(--color-brand);
  color:var(--color-on-dark);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em
}

.visual-frame__tag--accent{
  background:var(--color-accent);
  color:var(--color-ink)
}

.breadcrumb{
  padding-block:14px 0;
  font-family:var(--font-mono);
  font-size:14px
}

.breadcrumb ol{
  display:flex;
  flex-wrap:wrap;
  gap:6px
}

.breadcrumb li + li::before{
  content:"/";
  margin-inline:6px;
  color:var(--color-line)
}

.breadcrumb a{
  color:var(--color-steel);
  text-decoration:none
}

.breadcrumb a:hover{
  color:var(--color-brand)
}

.breadcrumb [aria-current="page"]{
  color:var(--color-muted)
}

.site-header{
  position:relative;
  z-index:50;
  background:var(--color-bg);
  border-bottom:1px solid var(--color-line)
}

.header-ribbon{
  background:var(--color-brand);
  color:var(--color-accent-light)
}

.header-ribbon-inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  min-height:32px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em
}

.ribbon-caption{
  color:rgba(248,244,240,.85)
}

.header-ribbon .coord-tag{
  background:transparent;
  border:1px solid rgba(218,165,32,.5);
  color:var(--color-accent-light)
}

.header-inner{
  position:relative;
  max-width:var(--max-width);
  margin-inline:auto;
  padding-inline:var(--gutter)
}

.header-maingrid{
  position:relative;
  display:block;
  text-align:center;
  padding-block:clamp(24px,4vw,40px) 20px
}

.brand-link{
  display:inline-flex;
  align-items:center;
  gap:16px;
  color:var(--color-ink);
  text-decoration:none
}

.brand-mark{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  width:64px;
  height:64px;
  background:var(--color-brand);
  border-bottom:4px solid var(--color-accent);
  color:var(--color-on-dark);
  font-family:var(--font-display);
  font-size:32px;
  font-weight:900
}

.brand-titles{
  display:flex;
  flex-direction:column;
  align-items:flex-start;
  gap:6px;
  text-align:left
}

.brand-text{
  display:block;
  font-family:var(--font-display);
  font-size:clamp(24px,4vw,44px);
  font-weight:900;
  line-height:1
}

.brand-text small{
  display:block;
  margin-top:6px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.28em;
  color:var(--color-brand)
}

.brand-region{
  display:inline-block;
  padding:2px 8px;
  border:1px solid var(--color-line);
  font-family:var(--font-mono);
  font-size:12px;
  color:var(--color-muted)
}

.nav-toggle{
  display:none;
  align-items:center;
  gap:10px;
  padding:10px 16px;
  border:1px solid var(--color-brand);
  border-radius:0;
  background:none;
  color:var(--color-brand);
  font-family:var(--font-display);
  font-size:14px;
  font-weight:700;
  cursor:pointer
}

.nav-toggle:hover{
  background:var(--color-brand);
  color:var(--color-on-dark)
}

.nav-toggle-icon{
  display:inline-flex;
  flex-direction:column;
  justify-content:space-between;
  width:18px;
  height:14px
}

.nav-toggle-icon span{
  display:block;
  width:100%;
  height:2px;
  background:currentColor;
  transition:transform .3s ease,opacity .3s ease
}

.nav-toggle[aria-expanded="true"] .nav-toggle-icon span:nth-child(1){
  transform:translateY(6px) rotate(45deg)
}

.nav-toggle[aria-expanded="true"] .nav-toggle-icon span:nth-child(2){
  opacity:0
}

.nav-toggle[aria-expanded="true"] .nav-toggle-icon span:nth-child(3){
  transform:translateY(-6px) rotate(-45deg)
}

.site-nav{
  border-block:1px solid var(--color-line)
}

.nav-list{
  display:flex;
  justify-content:center;
  flex-wrap:wrap;
  gap:clamp(4px,1vw,16px)
}

.nav-list a{
  position:relative;
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:16px 12px 18px;
  font-family:var(--font-display);
  font-size:15px;
  font-weight:700;
  color:var(--color-ink);
  text-decoration:none
}

.nav-list a:hover{
  color:var(--color-brand);
  background:var(--color-bg-alt)
}

.nav-list a[aria-current="page"]{
  color:var(--color-brand)
}

.nav-list a[aria-current="page"]::after{
  content:"";
  position:absolute;
  left:12px;
  right:12px;
  bottom:-1px;
  height:3px;
  background:var(--color-accent)
}

.nav-index{
  font-family:var(--font-mono);
  font-size:.9em;
  font-weight:500;
  color:var(--color-accent)
}

.nav-meta{
  display:flex;
  justify-content:center;
  flex-wrap:wrap;
  gap:12px 32px;
  padding-block:12px 10px;
  font-family:var(--font-mono);
  font-size:12px;
  color:var(--color-muted)
}

body.nav-open{
  overflow:hidden
}

.site-footer{
  background:var(--color-dark);
  border-top:4px solid var(--color-accent);
  color:rgba(248,244,240,.75)
}

.footer-inner{
  max-width:var(--max-width);
  margin-inline:auto;
  padding:clamp(48px,8vw,72px) var(--gutter) 28px
}

.footer-grid{
  display:grid;
  grid-template-columns:minmax(0,2fr) minmax(0,1fr) minmax(0,1.2fr);
  gap:clamp(32px,6vw,72px);
  padding-bottom:48px;
  border-bottom:1px solid rgba(255,255,255,.14)
}

.footer-brand-title{
  margin-bottom:18px;
  font-family:var(--font-display);
  font-size:clamp(30px,4vw,42px);
  font-weight:900;
  color:var(--color-on-dark)
}

.footer-brand-title small{
  display:block;
  margin-top:8px;
  font-family:var(--font-mono);
  font-size:clamp(12px,1.5vw,16px);
  letter-spacing:.3em;
  color:var(--color-accent)
}

.footer-brand-desc{
  max-width:44ch;
  color:rgba(248,244,240,.65)
}

.footer-trust{
  margin-top:24px;
  padding-left:16px;
  border-left:3px solid var(--color-accent);
  font-size:14px;
  color:rgba(248,244,240,.8)
}

.footer-group{
  display:flex;
  flex-direction:column;
  gap:18px
}

.footer-heading{
  align-self:flex-start;
  padding-top:6px;
  border-top:3px solid var(--color-accent);
  font-family:var(--font-mono);
  font-size:14px;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--color-accent)
}

.footer-list{
  display:flex;
  flex-direction:column;
  gap:10px
}

.footer-list a{
  display:inline-block;
  font-size:15px;
  color:rgba(248,244,240,.68);
  text-decoration:none;
  transition:color .2s ease,transform .2s ease
}

.footer-list a:hover{
  color:var(--color-accent);
  transform:translateX(4px)
}

.footer-item{
  display:flex;
  gap:10px;
  margin-bottom:8px;
  font-size:15px;
  color:rgba(248,244,240,.72)
}

.footer-item::before{
  content:"▹";
  color:var(--color-accent)
}

.footer-bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:14px 24px;
  padding-top:22px;
  font-size:13px;
  color:rgba(248,244,240,.45)
}

.footer-bottom-links{
  display:flex;
  flex-wrap:wrap;
  gap:18px
}

.footer-bottom-links a{
  color:rgba(248,244,240,.68);
  text-decoration:none
}

.footer-bottom-links a:hover{
  color:var(--color-accent)
}

.footer-icp{
  font-family:var(--font-mono)
}

html.js [data-reveal]{
  opacity:0;
  transform:translateY(24px);
  transition:opacity .7s cubic-bezier(.2,.6,.2,1),transform .7s cubic-bezier(.2,.6,.2,1)
}

html.js [data-reveal].is-revealed{
  opacity:1;
  transform:none
}

@media (max-width:920px){
  .header-maingrid{
    display:flex;
    align-items:center;
    justify-content:space-between;
    text-align:left;
    padding-block:18px 14px
  }

  .brand-mark{
    width:48px;
    height:48px;
    font-size:26px
  }

  .brand-text{
    font-size:24px
  }

  .brand-text small{
    font-size:9px;
    letter-spacing:.2em
  }

  .brand-region{
    display:none
  }

  .nav-toggle{
    display:inline-flex
  }

  .site-nav{
    position:absolute;
    top:100%;
    left:0;
    right:0;
    display:none;
    padding:8px var(--gutter) 16px;
    background:var(--color-bg);
    border-bottom:1px solid var(--color-line);
    box-shadow:var(--shadow)
  }

  .site-nav[data-open]{
    display:block
  }

  .nav-list{
    flex-direction:column;
    align-items:stretch;
    gap:0
  }

  .nav-list a{
    width:100%;
    padding:14px 12px;
    border-bottom:1px solid var(--color-line)
  }

  .nav-list a[aria-current="page"]::after{
    display:none
  }

  .nav-list a[aria-current="page"]{
    background:rgba(139,0,0,.08)
  }

  .nav-meta{
    justify-content:flex-start;
    padding:14px 0 4px
  }

  .footer-grid{
    grid-template-columns:1fr 1fr
  }

  .footer-brand{
    grid-column:1/-1
  }
}

@media (max-width:600px){
  .index-row{
    grid-template-columns:48px 1fr;
    gap:4px 14px;
    padding:22px 0
  }

  .index-row__desc{
    grid-column:2
  }

  .index-row__arrow{
    display:none
  }

  .footer-grid{
    grid-template-columns:1fr
  }

  .footer-bottom{
    flex-direction:column;
    align-items:flex-start
  }

  .fold-panel{
    padding-left:20px
  }
}

@media (prefers-reduced-motion:reduce){
  html{
    scroll-behavior:auto
  }

  *,
  *::before,
  *::after{
    animation-duration:.01ms !important;
    transition-duration:.01ms !important
  }

  html.js [data-reveal]{
    opacity:1 !important;
    transform:none !important;
    transition:none !important
  }
}