/* ==========================================================================
   银河中心 · 共享站点样式 /assets/site.css
   深空靛蓝底 · 银河紫刻度 · 暖琥珀动作锚点
   ========================================================================== */

:root{
  /* 色彩体系 */
  --yh-bg:#0B1026;
  --yh-surface:#141A36;
  --yh-line:#2A3157;
  --yh-violet:#6C5CE7;
  --yh-violet-soft:#A69BFF;
  --yh-amber:#F0A24B;
  --yh-amber-deep:#C97F2E;
  --yh-on-amber:#1A1206;
  --yh-text:#E8ECF8;
  --yh-muted:#9AA3C0;
  --yh-cyan:#4EC9E9;
  --yh-green:#4FBF8B;
  --yh-inverse:#F5F7FF;

  /* 字体 */
  --yh-font-sans:"PingFang SC","HarmonyOS Sans SC","Source Han Sans SC","Noto Sans CJK SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  --yh-font-mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,"Liberation Mono","Courier New",monospace;

  /* 度量 */
  --yh-radius:10px;
  --yh-gutter:32px;
  --yh-max:1280px;
  --yh-header-h:72px;
  --yh-ease:cubic-bezier(.22,.61,.36,1);
}

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

html{
  background-color:var(--yh-bg);
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:96px;
}

body{
  margin:0;
  min-height:100vh;
  font-family:var(--yh-font-sans);
  font-size:16px;
  line-height:1.75;
  color:var(--yh-text);
  background-color:var(--yh-bg);
  background-image:
    radial-gradient(900px 560px at 84% -10%, rgba(108,92,231,.30), rgba(108,92,231,0) 70%),
    radial-gradient(640px 420px at 2% 4%, rgba(78,201,233,.10), rgba(78,201,233,0) 70%),
    radial-gradient(circle, rgba(232,236,248,.30) 0 1px, rgba(232,236,248,0) 1.6px),
    radial-gradient(circle, rgba(166,155,255,.22) 0 1px, rgba(166,155,255,0) 1.6px);
  background-size:auto,auto,260px 260px,420px 420px;
  background-position:0 0,0 0,0 0,140px 180px;
  background-repeat:no-repeat,no-repeat,repeat,repeat;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

h1,h2,h3,h4,h5,h6{
  margin:0;
  font-weight:600;
  letter-spacing:-.02em;
  line-height:1.2;
  color:var(--yh-text);
}

p{margin:0 0 1em;}
ul,ol{margin:0 0 1em;padding-left:1.15em;}
li{margin:.25em 0;}
a{color:var(--yh-violet-soft);text-decoration:none;}
a:hover{color:#FFFFFF;}
img,svg,video{display:block;max-width:100%;height:auto;}
button{font:inherit;color:inherit;}
hr{border:0;border-top:1px solid var(--yh-line);margin:0;}
::selection{background:rgba(108,92,231,.45);color:#FFFFFF;}

:focus-visible{outline:2px solid var(--yh-cyan);outline-offset:3px;border-radius:4px;}

#main-content{scroll-margin-top:var(--yh-header-h);}

/* ---------- 排版工具 ---------- */
.yh-display{
  margin:0;
  font-size:clamp(40px,5.6vw,76px);
  font-weight:700;
  font-stretch:92%;
  letter-spacing:-.03em;
  line-height:1.05;
}
.yh-title{
  margin:0;
  font-size:clamp(26px,3vw,38px);
  font-weight:600;
  font-stretch:94%;
  letter-spacing:-.02em;
  line-height:1.2;
}
.yh-lead{margin:0;font-size:17px;line-height:1.8;color:var(--yh-muted);}
.yh-note{margin:0;font-size:13px;line-height:1.75;letter-spacing:.05em;color:var(--yh-muted);}
.yh-index{font-family:var(--yh-font-mono);font-size:13px;font-weight:500;letter-spacing:.08em;color:var(--yh-cyan);}
.yh-meta{font-family:var(--yh-font-mono);font-size:12px;letter-spacing:.06em;color:var(--yh-muted);}
.yh-eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  margin:0 0 16px;
  font-family:var(--yh-font-mono);
  font-size:11px;
  font-weight:500;
  letter-spacing:.24em;
  text-transform:uppercase;
  color:var(--yh-violet-soft);
}
.yh-eyebrow::before{
  content:"";
  width:22px;height:1px;
  background:linear-gradient(90deg,var(--yh-violet),rgba(108,92,231,0));
}
.yh-sr-only{
  position:absolute;width:1px;height:1px;padding:0;margin:-1px;
  overflow:hidden;clip:rect(0 0 0 0);clip-path:inset(50%);
  white-space:nowrap;border:0;
}

/* ---------- 容器与网格 ---------- */
.yh-wrap{
  width:100%;
  max-width:var(--yh-max);
  margin-inline:auto;
  padding-inline:var(--yh-gutter);
}
.yh-grid{display:grid;gap:var(--yh-gutter);}
.yh-grid--split{grid-template-columns:minmax(0,7fr) minmax(0,3fr);}
.yh-grid--wide{grid-template-columns:minmax(0,8fr) minmax(0,4fr);}
.yh-grid--halves{grid-template-columns:repeat(2,minmax(0,1fr));}
.yh-grid--thirds{grid-template-columns:repeat(3,minmax(0,1fr));}

/* ---------- 框景 ---------- */
.yh-frame{
  position:relative;
  border:1px solid var(--yh-line);
  border-radius:var(--yh-radius);
  background:linear-gradient(180deg,rgba(20,26,54,.72),rgba(11,16,38,.5));
}
.yh-frame__corner{
  position:absolute;
  width:8px;height:8px;
  border:0 solid var(--yh-violet);
  pointer-events:none;
}
.yh-frame__corner--tl{top:-1px;left:-1px;border-top-width:1.5px;border-left-width:1.5px;}
.yh-frame__corner--tr{top:-1px;right:-1px;border-top-width:1.5px;border-right-width:1.5px;}
.yh-frame__corner--bl{bottom:-1px;left:-1px;border-bottom-width:1.5px;border-left-width:1.5px;}
.yh-frame__corner--br{bottom:-1px;right:-1px;border-bottom-width:1.5px;border-right-width:1.5px;}

/* ---------- 章节 ---------- */
.yh-section{padding:64px 0;}
.yh-section__head{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  gap:12px 20px;
  margin-bottom:28px;
}
.yh-section__title{margin:0;font-size:clamp(22px,2.4vw,30px);font-weight:600;letter-spacing:-.02em;}
.yh-section__note{margin:0;font-size:13px;letter-spacing:.05em;color:var(--yh-muted);}

/* ---------- 按钮 ---------- */
.yh-btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:10px 18px;
  border:1px solid transparent;
  border-radius:var(--yh-radius);
  font-family:inherit;
  font-size:14px;
  font-weight:500;
  line-height:1.2;
  letter-spacing:.01em;
  text-decoration:none;
  cursor:pointer;
  transition:background-color .18s var(--yh-ease),
             border-color .18s var(--yh-ease),
             color .18s var(--yh-ease),
             transform .18s var(--yh-ease),
             box-shadow .18s var(--yh-ease);
}
.yh-btn--amber{background:var(--yh-amber);color:var(--yh-on-amber);box-shadow:0 6px 18px rgba(240,162,75,.16);}
.yh-btn--amber:hover{background:var(--yh-amber-deep);color:var(--yh-on-amber);transform:translateY(-1px);}
.yh-btn--amber:active{transform:translateY(0);box-shadow:none;}
.yh-btn--ghost{border-color:var(--yh-line);background:rgba(20,26,54,.66);color:var(--yh-text);}
.yh-btn--ghost:hover{border-color:var(--yh-violet);background:rgba(108,92,231,.18);color:#FFFFFF;}
.yh-btn--sm{padding:8px 14px;font-size:13px;}
.yh-btn--block{width:100%;}

/* ---------- 跳转链接 ---------- */
.yh-skip{
  position:fixed;
  top:-70px;left:16px;
  z-index:120;
  padding:10px 18px;
  border-radius:0 0 var(--yh-radius) var(--yh-radius);
  background:var(--yh-amber);
  color:var(--yh-on-amber);
  font-size:14px;
  font-weight:600;
  transition:top .2s var(--yh-ease);
}
.yh-skip:focus{top:0;color:var(--yh-on-amber);}

/* ---------- 头部 ---------- */
.yh-header{
  position:sticky;
  top:0;
  z-index:60;
  background:rgba(11,16,38,.86);
  border-bottom:1px solid var(--yh-line);
  backdrop-filter:blur(14px) saturate(130%);
  -webkit-backdrop-filter:blur(14px) saturate(130%);
}
.yh-header__bar{
  display:flex;
  align-items:center;
  gap:20px;
  min-height:var(--yh-header-h);
}

.yh-brand{
  display:inline-flex;
  align-items:center;
  gap:12px;
  flex:0 0 auto;
  color:var(--yh-text);
  text-decoration:none;
}
.yh-brand:hover{color:#FFFFFF;}
.yh-brand__mark{
  position:relative;
  flex:0 0 auto;
  width:26px;height:26px;
  border:1px solid var(--yh-line);
  border-radius:50%;
}
.yh-brand__mark::before{
  content:"";
  position:absolute;inset:5px;
  border-radius:50%;
  background:radial-gradient(circle at 34% 30%, #FFFFFF, var(--yh-violet) 58%, rgba(108,92,231,0) 78%);
  box-shadow:0 0 16px rgba(108,92,231,.75);
}
.yh-brand__mark::after{
  content:"";
  position:absolute;inset:-6px;
  border:1px dashed rgba(166,155,255,.34);
  border-radius:50%;
}
.yh-brand__text{
  display:flex;
  flex-direction:column;
  line-height:1.1;
  font-size:17px;
  font-weight:600;
  letter-spacing:-.01em;
}
.yh-brand__sub{
  margin-top:4px;
  font-family:var(--yh-font-mono);
  font-size:10px;
  font-weight:500;
  letter-spacing:.22em;
  color:var(--yh-muted);
}

.yh-nav{margin-left:auto;}
.yh-nav__list{
  display:flex;
  align-items:center;
  gap:2px;
  margin:0;
  padding:0;
  list-style:none;
  counter-reset:yh-nav;
}
.yh-nav__item{margin:0;}
.yh-nav__link{
  position:relative;
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:9px 12px;
  border-radius:8px;
  font-size:14px;
  color:var(--yh-muted);
  white-space:nowrap;
  transition:color .18s var(--yh-ease),background-color .18s var(--yh-ease);
}
.yh-nav__link::before{
  display:none;
  counter-increment:yh-nav;
  content:counter(yh-nav,decimal-leading-zero);
  font-family:var(--yh-font-mono);
  font-size:11px;
  letter-spacing:.1em;
  color:var(--yh-violet-soft);
}
.yh-nav__link:hover{color:var(--yh-text);background:rgba(108,92,231,.16);}
.yh-nav__link[aria-current="page"]{color:var(--yh-text);}
.yh-nav__link[aria-current="page"]::after{
  content:"";
  position:absolute;
  left:12px;right:12px;bottom:3px;
  height:1px;
  background:var(--yh-violet);
  box-shadow:0 0 8px rgba(108,92,231,.9);
}

.yh-header__actions{
  display:flex;
  align-items:center;
  gap:10px;
  flex:0 0 auto;
  margin-left:14px;
}

.yh-nav-toggle{
  display:none;
  align-items:center;
  gap:9px;
  margin-left:auto;
  padding:9px 14px;
  border:1px solid var(--yh-line);
  border-radius:var(--yh-radius);
  background:rgba(20,26,54,.7);
  color:var(--yh-text);
  font-size:13px;
  letter-spacing:.04em;
  cursor:pointer;
  transition:border-color .18s var(--yh-ease),color .18s var(--yh-ease);
}
.yh-nav-toggle:hover{border-color:var(--yh-violet);color:#FFFFFF;}
.yh-nav-toggle__bars{
  position:relative;
  display:block;
  flex:0 0 auto;
  width:16px;height:10px;
}
.yh-nav-toggle__bars::before,
.yh-nav-toggle__bars::after{
  content:"";
  position:absolute;
  left:0;width:100%;height:1.5px;
  background:currentColor;
  transition:transform .22s var(--yh-ease);
}
.yh-nav-toggle__bars::before{top:0;}
.yh-nav-toggle__bars::after{bottom:0;}
.yh-header[data-open] .yh-nav-toggle__bars::before{transform:translateY(4.25px) rotate(45deg);}
.yh-header[data-open] .yh-nav-toggle__bars::after{transform:translateY(-4.25px) rotate(-45deg);}

.yh-progress{
  position:absolute;
  left:0;bottom:-1px;
  width:100%;height:2px;
  transform:scaleX(0);
  transform-origin:0 50%;
  background:linear-gradient(90deg,var(--yh-violet),var(--yh-cyan));
  pointer-events:none;
  will-change:transform;
}

/* ---------- 页脚 ---------- */
.yh-footer{
  margin-top:96px;
  border-top:1px solid var(--yh-line);
  background:linear-gradient(180deg,rgba(20,26,54,.62) 0%,rgba(11,16,38,.96) 62%);
}
.yh-footer__grid{
  display:grid;
  grid-template-columns:
    minmax(0,1.5fr)
    repeat(3,minmax(0,.95fr))
    minmax(0,1.35fr);
  gap:40px 32px;
  padding:60px 0 44px;
}
.yh-footer__wordmark{margin:0 0 8px;font-size:19px;font-weight:600;letter-spacing:.02em;}
.yh-footer__sign{margin:0 0 20px;font-size:13px;letter-spacing:.08em;color:var(--yh-violet-soft);}
.yh-footer__title{
  position:relative;
  margin:0 0 16px;
  padding-left:14px;
  font-size:13px;
  font-weight:600;
  letter-spacing:.08em;
  color:var(--yh-text);
}
.yh-footer__title::before{
  content:"";
  position:absolute;
  left:0;top:.68em;
  width:6px;height:1px;
  background:var(--yh-amber);
}
.yh-footer__list{margin:0;padding:0;list-style:none;}
.yh-footer__list li{margin:0 0 10px;}
.yh-footer__link{
  font-size:14px;
  color:var(--yh-text);
  opacity:.78;
  transition:color .18s var(--yh-ease),opacity .18s var(--yh-ease);
}
.yh-footer__link:hover{color:var(--yh-violet-soft);opacity:1;}
.yh-footer__meta{
  margin:0 0 10px;
  font-size:13px;
  line-height:1.7;
  color:var(--yh-text);
  opacity:.78;
}
.yh-footer__key{
  display:inline-block;
  min-width:42px;
  margin-right:8px;
  font-family:var(--yh-font-mono);
  font-size:11px;
  letter-spacing:.14em;
  color:var(--yh-cyan);
}
.yh-footer__note{margin:14px 0 0;font-size:12px;line-height:1.75;color:var(--yh-muted);}
.yh-footer__base{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:10px 28px;
  padding:22px 0 40px;
  border-top:1px solid var(--yh-line);
  font-size:12px;
  letter-spacing:.02em;
  color:var(--yh-muted);
}
.yh-footer__base p{margin:0;}
.yh-footer__icp{font-family:var(--yh-font-mono);}
.yh-footer__legal{
  display:flex;
  flex-wrap:wrap;
  gap:8px 20px;
  margin:0 0 0 auto;
  padding:0;
  list-style:none;
}
.yh-footer__legal li{margin:0;}
.yh-footer__legal .yh-footer__link{font-size:12px;}

/* ---------- 面包屑 ---------- */
.yh-crumbs{margin:0 0 28px;}
.yh-crumbs__list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:10px;
  margin:0;
  padding:0;
  list-style:none;
  font-size:12px;
  letter-spacing:.05em;
  color:var(--yh-muted);
}
.yh-crumbs__list li{
  display:inline-flex;
  align-items:center;
  gap:10px;
  margin:0;
}
.yh-crumbs__list li+li::before{
  content:"/";
  font-family:var(--yh-font-mono);
  color:var(--yh-line);
}
.yh-crumbs__list a{color:var(--yh-muted);}
.yh-crumbs__list a:hover{color:var(--yh-violet-soft);}
.yh-crumbs__list [aria-current="page"]{color:var(--yh-text);}

/* ---------- 卡片 / 标签 / 列表 ---------- */
.yh-card{
  display:flex;
  flex-direction:column;
  gap:12px;
  padding:24px;
  border:1px solid var(--yh-line);
  border-radius:var(--yh-radius);
  background:rgba(20,26,54,.6);
  transition:border-color .2s var(--yh-ease),transform .2s var(--yh-ease);
}
.yh-card:hover{border-color:rgba(108,92,231,.62);transform:translateY(-2px);}
.yh-card__title{margin:0;font-size:17px;font-weight:600;letter-spacing:-.01em;}
.yh-card__meta{margin:0;font-family:var(--yh-font-mono);font-size:12px;letter-spacing:.06em;color:var(--yh-muted);}

.yh-chip{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:8px 14px;
  border:1px solid var(--yh-line);
  border-radius:999px;
  background:rgba(20,26,54,.6);
  color:var(--yh-muted);
  font-family:inherit;
  font-size:13px;
  letter-spacing:.03em;
  cursor:pointer;
  transition:border-color .18s var(--yh-ease),
             background-color .18s var(--yh-ease),
             color .18s var(--yh-ease);
}
.yh-chip:hover{border-color:var(--yh-violet);color:var(--yh-text);}
.yh-chip[aria-pressed="true"]{
  border-color:var(--yh-violet);
  background:rgba(108,92,231,.2);
  color:#FFFFFF;
}
.yh-chip__count{font-family:var(--yh-font-mono);font-size:11px;color:var(--yh-cyan);}

.yh-list{margin:0;padding:0;list-style:none;}
.yh-list li{
  display:flex;
  gap:16px;
  align-items:baseline;
  margin:0;
  padding:14px 0;
  border-bottom:1px solid rgba(42,49,87,.6);
}
.yh-list li:last-child{border-bottom:0;}

/* ---------- 图片容器 ---------- */
.yh-media{
  position:relative;
  overflow:hidden;
  aspect-ratio:16/9;
  border:1px solid var(--yh-line);
  border-radius:var(--yh-radius);
  background:
    radial-gradient(120% 90% at 50% 0%, rgba(108,92,231,.28), rgba(11,16,38,0) 70%),
    var(--yh-surface);
}
.yh-media img{width:100%;height:100%;object-fit:cover;}
.yh-media--wide{aspect-ratio:21/9;}
.yh-media--tall{aspect-ratio:3/4;}
.yh-media--square{aspect-ratio:1/1;}
.yh-media__caption{margin-top:10px;font-size:12px;letter-spacing:.06em;color:var(--yh-muted);}

/* ---------- 显现动效 ---------- */
.yh-js [data-reveal]{
  opacity:0;
  transform:translateY(8px);
  transition:opacity .46s var(--yh-ease),transform .46s var(--yh-ease);
}
.yh-js [data-reveal].is-revealed{opacity:1;transform:none;}

/* ==========================================================================
   响应式
   ========================================================================== */

@media (max-width:1080px){
  .yh-nav-toggle{display:inline-flex;}
  .yh-header__actions{display:none;}

  .yh-nav{
    position:fixed;
    top:var(--yh-header-h);
    left:0;right:0;
    z-index:55;
    margin:0;
    max-height:0;
    overflow:hidden;
    visibility:hidden;
    background:rgba(11,16,38,.97);
    border-bottom:1px solid var(--yh-line);
    backdrop-filter:blur(16px);
    -webkit-backdrop-filter:blur(16px);
    transition:max-height .28s var(--yh-ease),visibility .28s;
  }
  .yh-header[data-open] .yh-nav{
    max-height:min(76vh,520px);
    overflow-y:auto;
    visibility:visible;
  }
  .yh-nav__list{
    flex-direction:column;
    align-items:stretch;
    gap:0;
    padding:8px var(--yh-gutter) 20px;
  }
  .yh-nav__link{
    justify-content:flex-start;
    padding:15px 4px;
    border-bottom:1px solid rgba(42,49,87,.55);
    border-radius:0;
    font-size:15px;
  }
  .yh-nav__link::before{display:inline-block;min-width:28px;}
  .yh-nav__link::after{display:none;}
  .yh-nav__link[aria-current="page"]::after{display:none;}
  .yh-nav__item:last-child .yh-nav__link{border-bottom:0;}

  .yh-footer__grid{
    grid-template-columns:repeat(3,minmax(0,1fr));
    padding-top:48px;
  }
  .yh-footer__brand{grid-column:1/-1;}
  .yh-footer__contact{grid-column:1/-1;}
}

@media (max-width:1024px){
  .yh-grid--thirds{grid-template-columns:repeat(2,minmax(0,1fr));}
}

@media (max-width:900px){
  .yh-grid--split,
  .yh-grid--wide,
  .yh-grid--halves{grid-template-columns:minmax(0,1fr);}
  .yh-section{padding:48px 0;}
  .yh-footer{margin-top:72px;}
}

@media (max-width:768px){
  :root{
    --yh-gutter:20px;
    --yh-header-h:64px;
  }
  body{font-size:15.5px;}
  .yh-brand__text{font-size:16px;}
  .yh-lead{font-size:16px;}
}

@media (max-width:640px){
  .yh-grid--thirds{grid-template-columns:minmax(0,1fr);}
  .yh-footer__grid{grid-template-columns:minmax(0,1fr);gap:32px;}
  .yh-footer__legal{margin-left:0;}
  .yh-section{padding:40px 0;}
  .yh-header__bar{gap:12px;}
}

/* ==========================================================================
   减少动态效果
   ========================================================================== */
@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;
  }
  .yh-js [data-reveal]{opacity:1;transform:none;}
  .yh-card:hover{transform:none;}
  .yh-btn--amber:hover{transform:none;}
  .yh-progress{transition:none;}
  .yh-skip{transition:none;}
}