:root{
  --ky-night:#1A110C;
  --ky-brown:#2B1A12;
  --ky-jade:#143B38;
  --ky-indigo:#1E1B33;
  --ky-wine:#4A1720;
  --ky-cinnabar:#C4472E;
  --ky-gold:#C9A24B;
  --ky-paper:#F3E7D3;
  --ky-gray:#96A8A2;
  --ky-coord:#7FC8B8;
  --ky-line:rgba(201,162,75,.28);
  --ky-line-cool:rgba(127,200,184,.2);
  --ky-serif:"Noto Serif SC","Source Han Serif SC","Songti SC","SimSun",serif;
  --ky-sans:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --ky-mono:"IBM Plex Mono","JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --ky-wrap:1180px;
  --ky-pad:clamp(1rem,4vw,2.75rem);
  --ky-r:3px;
  --ky-r-lg:20px;
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background:
    radial-gradient(circle at 82% -8%,rgba(30,27,51,.92),transparent 58%),
    radial-gradient(circle at 4% 6%,rgba(20,59,56,.5),transparent 46%),
    var(--ky-night);
  color:var(--ky-paper);
  font-family:var(--ky-sans);
  font-size:1rem;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4{
  font-family:var(--ky-serif);
  font-weight:700;
  letter-spacing:.02em;
  line-height:1.24;
  color:var(--ky-paper);
  margin:0 0 .6em;
}
h1{font-size:clamp(2.25rem,5.4vw,4.25rem)}
h2{font-size:clamp(1.6rem,3.2vw,2.4rem)}
h3{font-size:clamp(1.15rem,2vw,1.5rem)}
p{margin:0 0 1.05em;max-width:68ch}
p:last-child{margin-bottom:0}
a{color:var(--ky-coord);text-decoration:none}
a:hover{color:var(--ky-gold)}
strong{color:var(--ky-gold);font-weight:700}
img,svg{max-width:100%}
img{height:auto}
ul,ol{list-style:none;margin:0;padding:0}
button{font:inherit;color:inherit}
code,kbd,samp{font-family:var(--ky-mono);font-size:.9em}
hr{border:0;border-top:1px solid var(--ky-line);margin:2rem 0}
::selection{background:var(--ky-gold);color:var(--ky-night)}
:focus-visible{outline:2px solid var(--ky-coord);outline-offset:3px;border-radius:2px}
#main-content{display:block;scroll-margin-top:clamp(104px,15vw,140px)}

/* ---------- 容器与通用排版 ---------- */
.ky-wrap{width:100%;max-width:var(--ky-wrap);margin-inline:auto;padding-inline:var(--ky-pad)}
.ky-prose{max-width:68ch}
.ky-prose p{max-width:none}
.ky-eyebrow{
  display:inline-flex;align-items:center;gap:.6rem;
  font-family:var(--ky-mono);font-size:.72rem;letter-spacing:.24em;
  text-transform:uppercase;color:var(--ky-coord);
  margin:0 0 .9rem;
}
.ky-eyebrow::before{content:"";width:26px;height:1px;background:var(--ky-gold)}

/* ---------- Skip link ---------- */
.ky-skip{
  position:absolute;left:var(--ky-pad);top:-120px;z-index:400;
  display:inline-block;padding:.6rem 1.1rem;
  background:var(--ky-gold);color:var(--ky-night);
  font-family:var(--ky-mono);font-size:.78rem;letter-spacing:.14em;
  border-radius:var(--ky-r);
  transition:top .18s ease;
}
.ky-skip:focus{top:.55rem;color:var(--ky-night)}

/* ---------- Header ---------- */
.ky-header{
  position:sticky;top:0;z-index:120;
  background:
    repeating-linear-gradient(90deg,rgba(127,200,184,.06) 0 1px,transparent 1px 96px),
    repeating-linear-gradient(0deg,rgba(127,200,184,.045) 0 1px,transparent 1px 96px),
    linear-gradient(180deg,rgba(26,17,12,.98),rgba(36,22,14,.98));
  border-bottom:1px solid var(--ky-line);
  box-shadow:0 22px 44px -34px rgba(0,0,0,.95);
}
.ky-progress{height:2px;background:rgba(127,200,184,.12);overflow:hidden}
.ky-progress__fill{
  display:block;height:100%;width:0;
  background:linear-gradient(90deg,var(--ky-coord),var(--ky-gold) 72%,var(--ky-cinnabar));
  transition:width .12s linear;
}

.ky-header__upper{
  background:linear-gradient(180deg,rgba(20,59,56,.62),rgba(20,59,56,.28));
  border-bottom:1px solid rgba(127,200,184,.18);
}
.ky-header__upper-inner{
  display:flex;align-items:center;flex-wrap:wrap;
  gap:.35rem 1.25rem;
  min-height:38px;padding-block:.45rem;
  font-family:var(--ky-mono);font-size:.7rem;letter-spacing:.14em;
  color:var(--ky-gray);
}
.ky-brand-line{
  flex:1 1 auto;min-width:0;margin:0;max-width:none;
  font-family:var(--ky-mono);font-size:.72rem;letter-spacing:.16em;
  color:var(--ky-gold);
}
.ky-utility{display:flex;flex-wrap:wrap;gap:.35rem 1.15rem;list-style:none;margin:0;padding:0}
.ky-utility__item{position:relative;padding-left:.85rem;white-space:nowrap}
.ky-utility__item::before{
  content:"";position:absolute;left:0;top:.55em;
  width:4px;height:4px;background:var(--ky-coord);opacity:.75;
  transform:rotate(45deg);
}
.ky-badge{
  display:inline-flex;align-items:center;gap:.35rem;
  font-family:var(--ky-mono);font-size:.66rem;letter-spacing:.1em;
  padding:.2rem .55rem;border:1px solid var(--ky-line);
  border-radius:var(--ky-r);white-space:nowrap;
}
.ky-badge--gold{
  color:var(--ky-gold);
  border-color:rgba(201,162,75,.55);
  background:rgba(201,162,75,.09);
}
.ky-badge--icp{color:var(--ky-gray);border-color:rgba(150,168,162,.32)}

.ky-header__lower{
  background:linear-gradient(180deg,rgba(43,26,18,.55),rgba(26,17,12,.9));
}
.ky-header__lower-inner{
  display:flex;align-items:center;
  gap:clamp(.75rem,2vw,2rem);
  min-height:64px;padding-block:.5rem;
}
.ky-logo{display:inline-flex;align-items:center;gap:.65rem;color:var(--ky-paper);text-decoration:none}
.ky-logo:hover{color:var(--ky-paper)}
.ky-logo__mark{
  display:grid;place-items:center;flex:none;
  width:38px;height:38px;
  border:1px solid rgba(201,162,75,.6);
  border-radius:var(--ky-r);
  background:linear-gradient(135deg,rgba(196,71,46,.95),rgba(74,23,32,.95));
  color:var(--ky-gold);
  font-family:var(--ky-serif);font-size:1.15rem;line-height:1;
  box-shadow:inset 0 0 0 3px rgba(26,17,12,.55);
}
.ky-logo__text{display:flex;flex-direction:column;line-height:1.2}
.ky-logo__name{font-family:var(--ky-serif);font-size:1.02rem;letter-spacing:.08em;color:var(--ky-paper)}
.ky-logo__coord{
  font-family:var(--ky-mono);font-size:.58rem;letter-spacing:.26em;
  text-transform:uppercase;color:var(--ky-coord);
}

.ky-nav{
  display:flex;align-items:center;
  gap:clamp(.75rem,2vw,1.6rem);
  margin-inline-start:auto;
}
.ky-nav__list{display:flex;flex-wrap:wrap;align-items:center;gap:clamp(.2rem,1.1vw,.9rem);list-style:none;margin:0;padding:0}
.ky-nav__item{position:relative}
.ky-nav__link{
  position:relative;display:inline-block;
  padding:.45rem .55rem;border-radius:var(--ky-r);
  color:var(--ky-gray);font-size:.9rem;letter-spacing:.06em;
  transition:color .2s ease,background-color .2s ease;
}
.ky-nav__link:hover{color:var(--ky-paper);background:rgba(127,200,184,.09)}
.ky-nav__link[aria-current="page"]{color:var(--ky-gold)}
.ky-nav__link[aria-current="page"]::after{
  content:"";position:absolute;left:50%;bottom:-1px;
  width:6px;height:6px;background:var(--ky-gold);
  transform:translateX(-50%) rotate(45deg);
}
.ky-cta{
  display:inline-flex;align-items:center;gap:.45rem;
  padding:.55rem 1rem;
  font-family:var(--ky-mono);font-size:.76rem;letter-spacing:.12em;
  color:var(--ky-paper);
  border:1px solid var(--ky-cinnabar);
  border-radius:var(--ky-r);
  background:linear-gradient(140deg,rgba(196,71,46,.95),rgba(74,23,32,.95));
  transition:background-color .22s ease,color .22s ease,border-color .22s ease,transform .22s ease;
  white-space:nowrap;
}
.ky-cta:hover{color:#fff;background:var(--ky-cinnabar);border-color:var(--ky-gold);transform:translateY(-1px)}
.ky-cta--sm{font-size:.7rem;padding:.42rem .78rem}

.ky-navtoggle{
  display:none;align-items:center;gap:.5rem;
  margin-inline-start:auto;
  padding:.45rem .7rem;
  background:transparent;border:1px solid rgba(201,162,75,.45);
  border-radius:var(--ky-r);color:var(--ky-paper);
  font-family:var(--ky-mono);font-size:.72rem;letter-spacing:.14em;
  cursor:pointer;
}
.ky-navtoggle__bars{display:grid;gap:3px;width:16px}
.ky-navtoggle__bars i{display:block;height:1px;background:currentColor}
.ky-navtoggle__label{line-height:1}
.ky-navtoggle[aria-expanded="true"]{color:var(--ky-gold);border-color:var(--ky-gold);background:rgba(201,162,75,.1)}

/* ---------- 通用按钮 ---------- */
.ky-btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.5rem;
  padding:.7rem 1.35rem;
  font-family:var(--ky-mono);font-size:.8rem;letter-spacing:.14em;
  color:var(--ky-paper);background:transparent;
  border:1px solid var(--ky-line);border-radius:var(--ky-r);
  cursor:pointer;
  transition:background-color .22s ease,color .22s ease,border-color .22s ease,transform .22s ease;
}
.ky-btn:hover{color:var(--ky-night);background:var(--ky-gold);border-color:var(--ky-gold);transform:translateY(-1px)}
.ky-btn--primary{
  background:linear-gradient(140deg,var(--ky-cinnabar),var(--ky-wine));
  border-color:var(--ky-cinnabar);color:var(--ky-paper);
}
.ky-btn--primary:hover{background:var(--ky-cinnabar);color:#fff;border-color:var(--ky-gold)}
.ky-btn--ghost{color:var(--ky-coord);border-color:var(--ky-line-cool)}

/* ---------- 面包屑 ---------- */
.ky-breadcrumb{
  margin-block:clamp(1rem,3vw,1.75rem);
  font-family:var(--ky-mono);font-size:.72rem;letter-spacing:.1em;
  color:var(--ky-gray);
}
.ky-breadcrumb__list{display:flex;flex-wrap:wrap;gap:.5rem;list-style:none;margin:0;padding:0}
.ky-breadcrumb__item{display:inline-flex;align-items:center;gap:.5rem}
.ky-breadcrumb__item + .ky-breadcrumb__item::before{content:"/";color:rgba(150,168,162,.45)}
.ky-breadcrumb__link{color:var(--ky-gray)}
.ky-breadcrumb__link:hover{color:var(--ky-coord)}
.ky-breadcrumb__current{color:var(--ky-gold)}

/* ---------- 棋盘分区与网格 ---------- */
.ky-section{position:relative;padding-block:clamp(2.5rem,6.5vw,5.5rem)}
.ky-section--jade{background:linear-gradient(160deg,rgba(20,59,56,.94),rgba(26,17,12,.94))}
.ky-section--indigo{background:linear-gradient(160deg,rgba(30,27,51,.95),rgba(26,17,12,.94))}
.ky-section--wine{background:linear-gradient(160deg,rgba(74,23,32,.92),rgba(26,17,12,.95))}
.ky-section--rule{border-top:1px solid var(--ky-line-cool)}
.ky-grid{display:grid;gap:clamp(1rem,2.5vw,1.75rem)}
.ky-grid--board{grid-template-columns:repeat(auto-fit,minmax(min(260px,100%),1fr))}

/* ---------- 专题研究板卡片 ---------- */
.ky-card{
  position:relative;overflow:hidden;
  padding:clamp(1.1rem,2.5vw,1.7rem);
  background:linear-gradient(155deg,rgba(43,26,18,.88),rgba(26,17,12,.94));
  border:1px solid var(--ky-line);
  border-radius:var(--ky-r);
  transition:border-color .22s ease,transform .22s ease;
}
.ky-card:hover{border-color:rgba(201,162,75,.6);transform:translateY(-2px)}
.ky-card::after{
  content:"";position:absolute;right:0;bottom:0;
  width:44px;height:44px;
  background:linear-gradient(135deg,rgba(201,162,75,.24),transparent 70%);
  border-top-left-radius:100%;
  pointer-events:none;
}
.ky-card__coord{
  display:block;margin-bottom:.5rem;
  font-family:var(--ky-mono);font-size:.7rem;letter-spacing:.2em;
  color:var(--ky-gold);
}
.ky-card__title{font-family:var(--ky-serif);font-size:1.15rem;margin:0 0 .5rem;color:var(--ky-paper)}
.ky-card__body{font-size:.95rem;line-height:1.75;color:rgba(243,231,211,.82);margin:0;max-width:none}

/* ---------- 图片容器 ---------- */
.ky-figure{margin:0;display:grid;gap:.6rem}
.ky-figure__media{
  position:relative;overflow:hidden;
  aspect-ratio:16/10;
  border:1px solid rgba(201,162,75,.26);
  border-radius:var(--ky-r);
  background:
    repeating-linear-gradient(90deg,rgba(127,200,184,.1) 0 1px,transparent 1px 12.5%),
    repeating-linear-gradient(0deg,rgba(127,200,184,.08) 0 1px,transparent 1px 12.5%),
    linear-gradient(140deg,var(--ky-brown),var(--ky-jade) 58%,var(--ky-indigo));
}
.ky-figure__img{display:block;width:100%;height:100%;object-fit:cover}
.ky-figure__caption{
  display:flex;align-items:baseline;gap:.5rem;
  font-family:var(--ky-mono);font-size:.7rem;letter-spacing:.08em;
  color:var(--ky-gray);
}
.ky-figure__caption::before{content:"FIG.";color:var(--ky-gold);letter-spacing:.16em}
.ky-figure--wide .ky-figure__media{aspect-ratio:21/9}
.ky-figure--tall .ky-figure__media{aspect-ratio:4/5}

/* ---------- 可访问标签页 ---------- */
.ky-tabs{display:grid;gap:1rem}
.ky-tabs__list{
  display:flex;flex-wrap:wrap;gap:.4rem;
  padding-bottom:.55rem;
  border-bottom:1px solid var(--ky-line-cool);
}
.ky-tabs__tab{
  appearance:none;background:transparent;
  border:1px solid transparent;border-radius:var(--ky-r);
  padding:.5rem .85rem;
  font-family:var(--ky-mono);font-size:.75rem;letter-spacing:.12em;
  color:var(--ky-gray);cursor:pointer;
  transition:color .2s ease,background-color .2s ease,border-color .2s ease;
}
.ky-tabs__tab:hover{color:var(--ky-paper);background:rgba(127,200,184,.1)}
.ky-tabs__tab[aria-selected="true"]{
  color:var(--ky-night);background:var(--ky-gold);border-color:var(--ky-gold);
}
.ky-tabs__panels{display:block}
.ky-tabs__panel[hidden]{display:none}
.ky-tabs__panel{animation:ky-fade .32s ease both}
@keyframes ky-fade{from{opacity:0;transform:translateX(-6px)}to{opacity:1;transform:none}}

/* ---------- 渐显协议 ---------- */
.ky-js [data-reveal]{
  opacity:0;transform:translateY(16px);
  transition:opacity .55s ease,transform .55s cubic-bezier(.2,.7,.3,1);
}
.ky-js [data-reveal].is-in{opacity:1;transform:none}

/* ---------- Footer ---------- */
.ky-footer{
  position:relative;
  margin-top:clamp(2rem,6vw,4rem);
  background:
    repeating-linear-gradient(90deg,rgba(201,162,75,.05) 0 1px,transparent 1px 84px),
    linear-gradient(180deg,var(--ky-brown),var(--ky-night));
  border-top:1px solid var(--ky-line);
  color:var(--ky-gray);
}
.ky-footer__stripe{
  height:5px;
  background:repeating-linear-gradient(90deg,
    var(--ky-cinnabar) 0 28px,
    var(--ky-gold) 28px 56px,
    var(--ky-jade) 56px 84px,
    var(--ky-indigo) 84px 112px);
}
.ky-footer__top{
  display:grid;
  grid-template-columns:1.7fr 1fr 1fr 1.45fr;
  gap:clamp(1.5rem,3vw,2.75rem);
  padding-block:clamp(2.25rem,5vw,3.5rem);
}
.ky-footer__brand{min-width:0}
.ky-footer__summary{
  margin:1rem 0 .75rem;max-width:36ch;
  font-size:.92rem;line-height:1.75;color:rgba(243,231,211,.78);
}
.ky-footer__coord{
  margin:0 0 .3rem;max-width:none;
  font-family:var(--ky-mono);font-size:.68rem;letter-spacing:.14em;
  color:var(--ky-coord);opacity:.9;
}
.ky-footer__col{min-width:0}
.ky-footer__col-title{
  margin:0 0 1rem;
  font-family:var(--ky-mono);font-size:.7rem;font-weight:500;
  letter-spacing:.2em;text-transform:uppercase;
  color:var(--ky-gold);
}
.ky-footer__links{display:grid;gap:.55rem}
.ky-footer__link{
  display:inline-flex;align-items:center;gap:.5rem;
  font-size:.9rem;color:var(--ky-gray);
  transition:color .2s ease;
}
.ky-footer__link::before{
  content:"";flex:none;
  width:4px;height:4px;background:var(--ky-coord);opacity:.65;
  transform:rotate(45deg);transition:background-color .2s ease,opacity .2s ease;
}
.ky-footer__link:hover{color:var(--ky-paper)}
.ky-footer__link:hover::before{background:var(--ky-gold);opacity:1}
.ky-footer__links--plain .ky-footer__link::before{display:none}
.ky-footer__contact{
  display:grid;grid-template-columns:auto 1fr;align-items:baseline;
  gap:.15rem .6rem;
  font-size:.85rem;line-height:1.7;color:rgba(243,231,211,.8);
  word-break:break-word;
}
.ky-footer__label{
  font-family:var(--ky-mono);font-size:.64rem;letter-spacing:.16em;
  color:var(--ky-gold);white-space:nowrap;
}
.ky-footer__bottom{
  display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center;
  gap:.5rem 1.5rem;
  padding-block:1.1rem;
  border-top:1px solid rgba(201,162,75,.22);
}
.ky-footer__meta{
  margin:0;max-width:none;
  font-family:var(--ky-mono);font-size:.68rem;letter-spacing:.12em;
  color:rgba(150,168,162,.9);
}

/* ---------- 平板 ---------- */
@media (max-width:1024px){
  .ky-nav{gap:.6rem}
  .ky-nav__link{font-size:.84rem;padding:.4rem .45rem}
  .ky-footer__top{grid-template-columns:1.5fr 1fr 1fr}
  .ky-footer__col--contact{grid-column:1 / -1}
}

/* ---------- 移动导航 ---------- */
@media (max-width:960px){
  .ky-navtoggle{display:inline-flex}
  .ky-header__lower-inner{flex-wrap:wrap;min-height:58px}
  .ky-nav{
    display:none;
    order:5;flex-basis:100%;
    margin-inline-start:0;margin-top:.5rem;
    flex-direction:column;align-items:stretch;
    gap:.75rem;
    padding:.85rem 0 1.1rem;
    border-top:1px solid var(--ky-line-cool);
  }
  .ky-header[data-open] .ky-nav{display:flex}
  .ky-nav__list{flex-direction:column;align-items:stretch;gap:.1rem}
  .ky-nav__link{
    display:block;padding:.65rem .6rem;border-radius:0;
    font-size:1rem;letter-spacing:.04em;
    border-bottom:1px solid rgba(127,200,184,.1);
  }
  .ky-nav__item:last-child .ky-nav__link{border-bottom:0}
  .ky-nav__link[aria-current="page"]{
    color:var(--ky-gold);
    background:rgba(201,162,75,.1);
    box-shadow:inset 3px 0 0 var(--ky-gold);
  }
  .ky-nav__link[aria-current="page"]::after{display:none}
  .ky-cta--sm{align-self:flex-start}
}

/* ---------- 手机 ---------- */
@media (max-width:720px){
  .ky-header__upper-inner{gap:.3rem .8rem;font-size:.64rem;letter-spacing:.1em}
  .ky-brand-line{flex-basis:100%;font-size:.64rem;letter-spacing:.12em}
  .ky-utility{display:none}
  .ky-badge--icp{display:none}
  .ky-badge{font-size:.62rem;padding:.18rem .45rem}
  .ky-logo__mark{width:34px;height:34px;font-size:1rem}
  .ky-logo__name{font-size:.95rem}
  .ky-logo__coord{font-size:.54rem;letter-spacing:.2em}
  .ky-footer__top{grid-template-columns:1fr;gap:1.75rem}
  .ky-footer__col--contact{grid-column:auto}
  .ky-footer__bottom{flex-direction:column;align-items:flex-start;gap:.35rem}
  .ky-footer__summary{max-width:none}
  .ky-figure__caption{flex-wrap:wrap}
}

/* ---------- 减少动效 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  .ky-js [data-reveal]{opacity:1;transform:none}
  .ky-progress__fill{transition:none}
  .ky-card:hover,.ky-btn:hover,.ky-cta:hover{transform:none}
}