:root{
  --ink:#0E1B2A;
  --ink-2:#162A3D;
  --line:#244258;
  --copper:#B6803F;
  --copper-bright:#D9A45B;
  --cinnabar:#B23A2E;
  --mist:#E7EAEA;
  --paper:#F6F3EA;
  --char:#111C24;
  --cyan:#2E8C87;

  --font-head:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Noto Serif SC","Source Han Serif SC","Songti SC","SimSun",Georgia,serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  --max:1180px;
  --gutter:clamp(1.1rem,4vw,2.6rem);
  --line-soft:rgba(36,66,88,.75);
  --ease:cubic-bezier(.22,.68,.26,1);
}

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

html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
}

body{
  margin:0;
  background-color:var(--ink);
  color:var(--paper);
  font-family:var(--font-body);
  font-size:16.5px;
  line-height:1.85;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

img,
svg,
picture{max-width:100%;display:block;}

h1,h2,h3,h4,h5,h6{
  margin:0;
  font-family:var(--font-head);
  font-weight:700;
  line-height:1.28;
  letter-spacing:-.01em;
}

p{margin:0 0 1em;}
p:last-child{margin-bottom:0;}

a{color:inherit;text-decoration:none;}
a:hover{color:var(--copper-bright);}

ul,ol{margin:0;padding:0;}

button{font:inherit;color:inherit;}

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

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

.section{padding-block:clamp(2.8rem,7vw,5.2rem);}

.section-head{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  justify-content:space-between;
  gap:.6rem 1.5rem;
  margin-bottom:clamp(1.3rem,3vw,2.1rem);
  padding-bottom:.85rem;
  border-bottom:1px solid var(--line-soft);
}

/* ---------- 跳转链接 ---------- */
.u-skip{
  position:absolute;
  left:1rem;
  top:-5rem;
  z-index:300;
  padding:.65rem 1.15rem;
  background:var(--copper-bright);
  color:var(--ink);
  font-family:var(--font-head);
  font-size:.88rem;
  font-weight:700;
  letter-spacing:.06em;
  transition:top .18s var(--ease);
}
.u-skip:focus{top:.75rem;color:var(--ink);}

/* ---------- 页头 ---------- */
.site-header{
  position:relative;
  background-color:var(--ink);
  background-image:
    repeating-linear-gradient(90deg,rgba(46,140,135,.055) 0 1px,transparent 1px 88px),
    linear-gradient(180deg,var(--ink-2) 0%,var(--ink) 70%);
  border-bottom:1px solid var(--line-soft);
  color:var(--paper);
}

.site-header__rail{
  border-bottom:1px solid var(--line-soft);
  background:rgba(14,27,42,.55);
}

.site-header__rail-inner{
  display:flex;
  flex-wrap:wrap;
  justify-content:space-between;
  align-items:center;
  gap:.35rem 1.25rem;
  padding-block:.55rem;
  font-family:var(--font-mono);
  font-size:.66rem;
  letter-spacing:.18em;
  text-transform:uppercase;
}

.rail-tag{color:var(--cyan);}
.rail-note{color:rgba(231,234,234,.5);letter-spacing:.1em;text-transform:none;}

.site-header__masthead{
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:.55rem;
  padding:clamp(1.35rem,4vw,2.5rem) 0 clamp(1rem,2.6vw,1.5rem);
  text-align:center;
}

.brand{
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:.5rem;
  color:var(--paper);
}
.brand:hover{color:var(--paper);}

.brand__mark{
  font-family:var(--font-head);
  font-weight:800;
  font-size:clamp(1.7rem,4.6vw,2.7rem);
  line-height:1;
  letter-spacing:.24em;
  padding-left:.24em;
  color:var(--paper);
}

.brand__sub{
  font-family:var(--font-mono);
  font-size:.7rem;
  letter-spacing:.28em;
  padding-left:.28em;
  color:var(--copper-bright);
}

.masthead__line{
  margin:0;
  font-family:var(--font-head);
  font-size:.8rem;
  font-weight:500;
  letter-spacing:.16em;
  color:rgba(246,243,234,.55);
}

.nav-bar{
  border-top:1px solid var(--line-soft);
  background:linear-gradient(180deg,rgba(22,42,61,.55),rgba(14,27,42,.9));
}

.nav-bar__inner{
  display:grid;
  grid-template-columns:1fr auto 1fr;
  align-items:center;
  gap:.85rem;
  min-height:3.3rem;
}

.nav-bar__index{
  font-family:var(--font-mono);
  font-size:.66rem;
  letter-spacing:.2em;
  color:rgba(231,234,234,.42);
}

.site-nav{min-width:0;}

.site-nav__list{
  display:flex;
  flex-wrap:wrap;
  justify-content:center;
  gap:clamp(.1rem,1.6vw,1.4rem);
  list-style:none;
}

.site-nav__link{
  position:relative;
  display:inline-block;
  padding:.85rem .38rem;
  font-family:var(--font-head);
  font-size:.92rem;
  font-weight:500;
  letter-spacing:.06em;
  color:rgba(246,243,234,.76);
  transition:color .2s var(--ease);
}

.site-nav__link::after{
  content:"";
  position:absolute;
  left:.38rem;
  right:.38rem;
  bottom:.42rem;
  height:1px;
  background:var(--copper-bright);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .24s var(--ease);
}

.site-nav__link:hover,
.site-nav__link[aria-current="page"]{color:var(--copper-bright);}

.site-nav__link:hover::after,
.site-nav__link[aria-current="page"]::after{transform:scaleX(1);}

.nav-bar__cta{justify-self:end;}

.nav-toggle{
  display:none;
  align-items:center;
  gap:.55rem;
  padding:.48rem .7rem;
  background:transparent;
  border:1px solid var(--line);
  border-radius:0;
  color:var(--paper);
  font-family:var(--font-mono);
  font-size:.68rem;
  letter-spacing:.14em;
  cursor:pointer;
  transition:border-color .2s var(--ease),color .2s var(--ease);
}
.nav-toggle:hover{border-color:var(--copper-bright);color:var(--copper-bright);}

.nav-toggle__bars{
  position:relative;
  display:block;
  width:15px;
  height:1px;
  background:var(--copper-bright);
  transition:background-color .2s var(--ease);
}
.nav-toggle__bars::before,
.nav-toggle__bars::after{
  content:"";
  position:absolute;
  left:0;
  width:15px;
  height:1px;
  background:var(--copper-bright);
  transition:transform .22s var(--ease);
}
.nav-toggle__bars::before{top:-5px;}
.nav-toggle__bars::after{top:5px;}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars{background:transparent;}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before{transform:translateY(5px) rotate(45deg);}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{transform:translateY(-5px) rotate(-45deg);}

/* ---------- 页脚 ---------- */
.site-footer{
  position:relative;
  background-color:var(--ink);
  background-image:
    repeating-linear-gradient(90deg,rgba(46,140,135,.05) 0 1px,transparent 1px 88px),
    linear-gradient(180deg,var(--ink) 0%,var(--ink-2) 100%);
  border-top:1px solid var(--line-soft);
  color:rgba(246,243,234,.78);
  padding-top:clamp(2.4rem,6vw,4rem);
  font-size:.95rem;
}

.footer-grid{
  display:grid;
  grid-template-columns:1.55fr .8fr .8fr 1.25fr;
  gap:clamp(1.5rem,3.5vw,3rem);
  padding-bottom:clamp(1.9rem,4vw,3rem);
}

.footer-brand__mark{
  margin:0 0 .35rem;
  font-family:var(--font-head);
  font-size:1.3rem;
  font-weight:700;
  letter-spacing:.2em;
  color:var(--paper);
}

.footer-brand__note{
  margin:0 0 1.1rem;
  max-width:34ch;
  font-size:.9rem;
  line-height:1.85;
  color:rgba(246,243,234,.6);
}

.footer-col__title{
  margin:0 0 .95rem;
  font-family:var(--font-mono);
  font-size:.68rem;
  font-weight:500;
  letter-spacing:.2em;
  color:var(--copper-bright);
}

.footer-links{
  list-style:none;
  display:grid;
  gap:.55rem;
}
.footer-links a{
  font-size:.92rem;
  color:rgba(246,243,234,.72);
  transition:color .18s var(--ease);
}
.footer-links a:hover{color:var(--copper-bright);}

.footer-contact__list{
  margin:0;
  display:grid;
  gap:.62rem;
}

.footer-contact__row{
  display:grid;
  grid-template-columns:3.4rem minmax(0,1fr);
  gap:.5rem;
  align-items:baseline;
}

.footer-contact__label{
  margin:0;
  font-family:var(--font-mono);
  font-size:.66rem;
  letter-spacing:.1em;
  color:rgba(231,234,234,.42);
}

.footer-contact__value{
  margin:0;
  font-size:.88rem;
  line-height:1.65;
  color:rgba(246,243,234,.8);
  overflow-wrap:anywhere;
}

.footer-bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:.55rem 1.6rem;
  padding-block:1.05rem 1.6rem;
  border-top:1px solid var(--line-soft);
  font-family:var(--font-mono);
  font-size:.68rem;
  letter-spacing:.1em;
  color:rgba(231,234,234,.45);
}

.footer-bottom__legal{margin:0;}

.footer-bottom__links{
  display:flex;
  flex-wrap:wrap;
  gap:.4rem 1.1rem;
  list-style:none;
}
.footer-bottom__links a{color:rgba(231,234,234,.55);}
.footer-bottom__links a:hover{color:var(--copper-bright);}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.5rem;
  padding:.72rem 1.25rem;
  border:1px solid transparent;
  border-radius:0;
  font-family:var(--font-head);
  font-size:.86rem;
  font-weight:600;
  letter-spacing:.08em;
  cursor:pointer;
  transition:background-color .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease);
}

.btn--solid{
  background:var(--copper-bright);
  border-color:var(--copper-bright);
  color:var(--ink);
}
.btn--solid:hover{
  background:var(--copper);
  border-color:var(--copper);
  color:var(--paper);
}

.btn--ghost{
  background:transparent;
  border-color:var(--line);
  color:var(--paper);
}
.btn--ghost:hover{
  border-color:var(--copper-bright);
  color:var(--copper-bright);
}

.btn--sm{
  padding:.5rem .9rem;
  font-size:.78rem;
}

/* ---------- 标签 ---------- */
.tag{
  display:inline-block;
  padding:.2rem .55rem;
  border:1px solid var(--line);
  font-family:var(--font-mono);
  font-size:.64rem;
  letter-spacing:.14em;
  color:var(--cyan);
}
.tag--copper{border-color:var(--copper);color:var(--copper-bright);}
.tag--red{border-color:var(--cinnabar);color:var(--cinnabar);}

/* ---------- 面包屑 ---------- */
.breadcrumb{
  font-family:var(--font-mono);
  font-size:.7rem;
  letter-spacing:.1em;
  opacity:.72;
}

.breadcrumb__list{
  display:flex;
  flex-wrap:wrap;
  gap:.45rem;
  list-style:none;
}

.breadcrumb__item{display:flex;align-items:center;gap:.45rem;}

.breadcrumb__item + .breadcrumb__item::before{
  content:"/";
  color:var(--line);
}

.breadcrumb__link{color:inherit;transition:color .18s var(--ease);}
.breadcrumb__link:hover{color:var(--copper-bright);}

/* ---------- 网格与卡片 ---------- */
.grid-12{
  display:grid;
  grid-template-columns:repeat(12,minmax(0,1fr));
  gap:clamp(.9rem,2.4vw,1.7rem);
}

.card{
  position:relative;
  background:rgba(22,42,61,.62);
  border:1px solid var(--line);
  padding:clamp(1rem,2.4vw,1.6rem);
  transition:border-color .2s var(--ease),background-color .2s var(--ease);
}
.card:hover{
  border-color:var(--copper);
  background:rgba(22,42,61,.85);
}

.card__index{
  display:block;
  margin-bottom:.6rem;
  font-family:var(--font-mono);
  font-size:.7rem;
  letter-spacing:.18em;
  color:var(--cinnabar);
}

/* ---------- 图片容器 ---------- */
.media-frame{
  position:relative;
  overflow:hidden;
  background:var(--ink-2);
  border:1px solid var(--line);
  aspect-ratio:4 / 3;
}
.media-frame--wide{aspect-ratio:16 / 9;}
.media-frame--tall{aspect-ratio:3 / 4;}
.media-frame--square{aspect-ratio:1 / 1;}

.media-frame > img,
.media-frame > picture > img{
  width:100%;
  height:100%;
  object-fit:cover;
  display:block;
}

.media-frame::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background:linear-gradient(180deg,rgba(14,27,42,0) 45%,rgba(14,27,42,.38) 100%);
}

/* ---------- 正文 ---------- */
.prose{
  max-width:68ch;
  font-size:1.02rem;
  line-height:1.9;
}

.prose h2{
  margin:2.3rem 0 .85rem;
  font-size:clamp(1.28rem,2vw,1.55rem);
}
.prose h3{
  margin:1.8rem 0 .65rem;
  font-size:clamp(1.06rem,1.5vw,1.18rem);
}
.prose p{margin:0 0 1.05rem;}
.prose ul,
.prose ol{margin:0 0 1.15rem;padding-left:1.25rem;}
.prose li{margin-bottom:.42rem;}
.prose a{
  color:var(--copper);
  text-decoration:underline;
  text-underline-offset:.22em;
}
.prose a:hover{color:var(--cinnabar);}
.prose strong{font-weight:700;}

/* ---------- 显现动效 ---------- */
.has-js [data-reveal]{
  opacity:0;
  transform:translateY(12px);
  transition:opacity .48s var(--ease),transform .48s var(--ease);
}
.has-js [data-reveal].is-visible{
  opacity:1;
  transform:none;
}

/* ---------- 响应式 ---------- */
@media (max-width:960px){
  .footer-grid{grid-template-columns:1fr 1fr;}
}

@media (max-width:860px){
  .nav-bar__inner{
    display:flex;
    flex-wrap:wrap;
    align-items:center;
    justify-content:space-between;
    gap:.55rem;
    padding-block:.6rem;
    min-height:0;
  }

  .nav-bar__index{display:none;}

  .nav-toggle{display:inline-flex;order:1;}

  .nav-bar__cta{order:2;}

  .site-nav{
    order:3;
    flex:1 0 100%;
  }

  .site-nav__list{
    flex-direction:column;
    gap:0;
    padding:.3rem 0 0;
  }

  .site-nav__item{border-top:1px solid var(--line-soft);}

  .site-nav__link{
    display:block;
    padding:.88rem 0;
    font-size:1rem;
  }

  .site-nav__link::after{display:none;}

  .has-js .site-nav{
    max-height:0;
    overflow:hidden;
    opacity:0;
    transition:max-height .32s var(--ease),opacity .24s var(--ease);
  }
  .has-js .site-nav[data-open="true"]{
    max-height:36rem;
    opacity:1;
  }

  .grid-12{grid-template-columns:repeat(6,minmax(0,1fr));}
}

@media (max-width:620px){
  body{font-size:16px;}

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

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

  .grid-12{grid-template-columns:repeat(2,minmax(0,1fr));}

  .site-header__rail-inner{justify-content:center;text-align:center;}
}

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

  html{scroll-behavior:auto;}

  .has-js [data-reveal]{
    opacity:1;
    transform:none;
  }

  .has-js .site-nav{
    transition:none;
  }
}