/* ============================================================
   米乐赛场 · 共享样式 /assets/site.css
   ============================================================ */

:root{
  --midnight:#0A1430;
  --navy-deep:#071021;
  --field:#12224D;
  --brand-blue:#1E4FA8;
  --cyan:#2EF2D8;
  --orange:#FF6A1F;
  --cream:#F2EFE6;
  --mist:#A8BBDD;
  --green:#43D98A;
  --amber:#FFC24A;
  --glass:rgba(255,255,255,0.08);
  --glass-line:rgba(46,242,216,0.22);
  --line:rgba(168,187,221,0.18);
  --shell:1200px;
  --gutter:16px;
  --hdr-h:86px;
  --r-sm:10px;
  --r-md:16px;
  --r-lg:22px;
  --font-display:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC","Source Han Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-body:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC","Source Han Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono","Courier New",monospace;
}

@media (min-width:900px){
  :root{--gutter:28px;--hdr-h:98px;--shell:1240px;}
}

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box;}
html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:calc(var(--hdr-h) + 14px);
}
body{
  margin:0;
  padding-top:var(--hdr-h);
  min-height:100vh;
  background-color:var(--midnight);
  background-image:
    radial-gradient(920px 540px at 84% -10%, rgba(46,242,216,0.13), transparent 70%),
    radial-gradient(760px 480px at 4% 2%, rgba(30,79,168,0.38), transparent 72%);
  background-repeat:no-repeat;
  background-attachment:fixed;
  color:var(--cream);
  font-family:var(--font-body);
  font-size:16px;
  font-weight:400;
  line-height:1.75;
  overflow-x:hidden;
}
h1,h2,h3,h4,h5,p,figure,blockquote{margin:0;}
ul,ol{list-style:none;margin:0;padding:0;}
img,svg,video{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
button,input,select,textarea{font:inherit;color:inherit;}
button{background:none;border:0;}
strong,b{font-weight:700;}
::selection{background:rgba(46,242,216,0.3);color:#fff;}

:focus-visible{
  outline:3px solid var(--amber);
  outline-offset:3px;
  border-radius:6px;
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{
    animation-duration:0.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:0.001ms !important;
  }
}

/* ---------- 中文正文排版 ---------- */
h1,h2,h3,h4{font-family:var(--font-display);font-weight:700;line-height:1.28;letter-spacing:-0.01em;}
p{text-wrap:pretty;}
.u-skew{display:inline-block;transform:skewX(-3deg);transform-origin:left;}
.u-mono{font-family:var(--font-mono);letter-spacing:0.06em;}

/* ---------- 布局容器 ---------- */
.container{width:100%;max-width:var(--shell);margin:0 auto;padding-left:var(--gutter);padding-right:var(--gutter);}
.section{padding-top:40px;padding-bottom:40px;}
@media (min-width:900px){.section{padding-top:64px;padding-bottom:64px;}}

.grid{display:grid;gap:16px;grid-template-columns:minmax(0,1fr);}
@media (min-width:640px){.grid{grid-template-columns:repeat(2,minmax(0,1fr));}}
@media (min-width:1000px){.grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:20px;}}
.grid-2{display:grid;gap:16px;grid-template-columns:minmax(0,1fr);}
@media (min-width:760px){.grid-2{grid-template-columns:repeat(2,minmax(0,1fr));}}
.grid-3{display:grid;gap:16px;grid-template-columns:minmax(0,1fr);}
@media (min-width:760px){.grid-3{grid-template-columns:repeat(3,minmax(0,1fr));}}
.grid-4{display:grid;gap:16px;grid-template-columns:minmax(0,1fr);}
@media (min-width:640px){.grid-4{grid-template-columns:repeat(2,minmax(0,1fr));}}
@media (min-width:1000px){.grid-4{grid-template-columns:repeat(4,minmax(0,1fr));}}
.span-2{grid-column:span 1;}
.span-3{grid-column:span 1;}
@media (min-width:760px){.span-2{grid-column:span 2;}}
@media (min-width:1000px){.span-3{grid-column:span 3;}}

/* ---------- 卡片与面板 ---------- */
.card{
  position:relative;
  border-radius:var(--r-md);
  padding:18px;
}
@media (min-width:900px){.card{padding:22px;}}
.card-solid{
  background:var(--field);
  border:1px solid var(--line);
}
.card-glass{
  background:var(--glass);
  border:1px solid var(--glass-line);
  -webkit-backdrop-filter:blur(12px);
  backdrop-filter:blur(12px);
}

/* ---------- 标签 / 徽章 / 统计 ---------- */
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 10px;
  border-radius:999px;
  border:1px solid rgba(168,187,221,0.3);
  color:var(--mist);
  font-size:12px;
  letter-spacing:0.06em;
  line-height:1.6;
}
.tag-cyan{border-color:rgba(46,242,216,0.5);color:var(--cyan);}
.tag-orange{border-color:rgba(255,106,31,0.55);color:#FFB185;}
.tag-green{border-color:rgba(67,217,138,0.5);color:var(--green);}

.stat{display:flex;flex-direction:column;gap:4px;}
.stat-num{
  font-family:var(--font-display);
  font-weight:800;
  font-size:clamp(28px,7vw,46px);
  line-height:1;
  letter-spacing:-0.03em;
  font-variant-numeric:tabular-nums;
  color:var(--cream);
}
.stat-num.is-up{color:var(--green);}
.stat-num.is-hot{color:var(--cyan);}
.stat-label{font-size:13px;color:var(--mist);letter-spacing:0.04em;}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:11px 18px;
  border-radius:999px;
  border:1px solid transparent;
  font-family:var(--font-body);
  font-size:14px;
  font-weight:600;
  letter-spacing:0.02em;
  line-height:1.3;
  cursor:pointer;
  text-align:center;
  transition:transform .22s ease, box-shadow .22s ease, background .22s ease, color .22s ease, border-color .22s ease;
}
.btn:active{transform:translateY(1px);}
.btn-primary{
  background:linear-gradient(135deg,var(--orange),#FF8A4A);
  color:#1A0D05;
  box-shadow:0 8px 22px -12px rgba(255,106,31,0.95);
}
.btn-primary:hover{
  transform:translateY(-1px);
  box-shadow:0 14px 30px -10px rgba(255,106,31,0.95);
}
.btn-blue{
  background:linear-gradient(135deg,var(--brand-blue),#2F6FE0);
  color:#fff;
  border-color:rgba(46,242,216,0.5);
  box-shadow:0 0 0 1px rgba(46,242,216,0.14), 0 12px 28px -14px rgba(46,242,216,0.7);
}
.btn-blue:hover{
  background:linear-gradient(135deg,#2A63C9,#3F83FF);
  box-shadow:0 0 0 1px rgba(46,242,216,0.42), 0 16px 32px -12px rgba(46,242,216,0.8);
}
.btn-outline{
  background:rgba(255,255,255,0.05);
  color:var(--cream);
  border-color:rgba(168,187,221,0.42);
}
.btn-outline:hover{border-color:var(--cyan);color:#fff;}
.btn-ghost{
  background:transparent;
  color:var(--mist);
  border-color:rgba(168,187,221,0.28);
}
.btn-ghost:hover{color:var(--cream);border-color:var(--cyan);}
.btn-block{width:100%;}

/* ---------- 面包屑 ---------- */
.breadcrumbs{
  font-family:var(--font-mono);
  font-size:12.5px;
  letter-spacing:0.04em;
  color:var(--mist);
}
.breadcrumbs ol{display:flex;flex-wrap:wrap;align-items:center;gap:8px;}
.breadcrumbs li{display:flex;align-items:center;gap:8px;}
.breadcrumbs li::after{content:"/";color:rgba(168,187,221,0.4);}
.breadcrumbs li:last-child::after{content:"";}
.breadcrumbs a:hover{color:var(--cyan);}
.breadcrumbs [aria-current="page"]{color:var(--cream);}

/* ---------- 横向滑动轨道 ---------- */
.rail{
  display:flex;
  gap:14px;
  overflow-x:auto;
  padding-bottom:10px;
  scroll-snap-type:x mandatory;
  -webkit-overflow-scrolling:touch;
  scrollbar-width:thin;
}
.rail > *{flex:0 0 80%;scroll-snap-align:start;}
@media (min-width:700px){.rail > *{flex:0 0 44%;}}
@media (min-width:1000px){.rail > *{flex:0 0 30%;}}
.rail::-webkit-scrollbar{height:6px;}
.rail::-webkit-scrollbar-thumb{background:rgba(46,242,216,0.35);border-radius:99px;}

/* ---------- 折叠面板 ---------- */
.accordion{
  background:var(--field);
  border:1px solid var(--line);
  border-radius:var(--r-sm);
  overflow:hidden;
}
.accordion + .accordion{margin-top:10px;}
.accordion summary{
  list-style:none;
  cursor:pointer;
  padding:14px 18px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  font-weight:600;
  font-size:15.5px;
}
.accordion summary::-webkit-details-marker{display:none;}
.accordion summary::after{
  content:"+";
  font-family:var(--font-mono);
  color:var(--cyan);
  font-size:18px;
  line-height:1;
  transition:transform .24s ease;
}
.accordion[open] summary::after{transform:rotate(45deg);}
.accordion summary:hover{background:rgba(46,242,216,0.06);}
.accordion-body{padding:0 18px 18px;color:var(--mist);font-size:15px;}

/* ---------- 步骤编号 ---------- */
.step{display:flex;gap:14px;align-items:flex-start;}
.step-num{
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:0.18em;
  color:var(--cyan);
  line-height:2;
  flex:none;
}

/* ---------- 图片容器基础规则 ---------- */
.media{
  position:relative;
  overflow:hidden;
  border-radius:var(--r-md);
  background:linear-gradient(140deg,#12224D,#0A1430);
  border:1px solid var(--line);
}
.media img,
.media video{
  width:100%;
  height:100%;
  object-fit:cover;
}
.media-frame{
  padding:8px;
  border-radius:var(--r-lg);
  background:var(--glass);
  border:1px solid var(--glass-line);
}
.media-frame .media{border-radius:12px;}
.media-16x9{aspect-ratio:16/9;}
.media-4x3{aspect-ratio:4/3;}
.media-1x1{aspect-ratio:1/1;}
.media-3x4{aspect-ratio:3/4;}
.media-placeholder{
  display:grid;
  place-items:center;
  color:rgba(168,187,221,0.65);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:0.14em;
  background-image:
    linear-gradient(rgba(255,255,255,0.05) 1px,transparent 1px),
    linear-gradient(90deg,rgba(255,255,255,0.05) 1px,transparent 1px);
  background-size:30px 30px;
}
.media-caption{
  margin-top:10px;
  font-size:12.5px;
  line-height:1.7;
  color:var(--mist);
}

/* ---------- 筛选协议 ---------- */
.filter-bar{
  display:flex;
  gap:8px;
  overflow-x:auto;
  padding-bottom:6px;
  scrollbar-width:none;
}
.filter-bar::-webkit-scrollbar{display:none;}
.filter-chip{
  flex:none;
  padding:8px 15px;
  border-radius:999px;
  border:1px solid rgba(168,187,221,0.28);
  background:rgba(255,255,255,0.03);
  color:var(--mist);
  font-size:14px;
  font-weight:500;
  cursor:pointer;
  transition:color .2s ease, border-color .2s ease, background .2s ease, box-shadow .2s ease;
}
.filter-chip:hover{color:var(--cream);border-color:rgba(46,242,216,0.45);}
.filter-chip[aria-pressed="true"]{
  color:#06131F;
  background:linear-gradient(135deg,var(--cyan),#7FF0DD);
  border-color:transparent;
  box-shadow:0 0 20px -6px rgba(46,242,216,0.85);
}
[data-filter-item]{transition:opacity .26s ease, transform .26s ease;}
[data-filter-item][hidden]{display:none;}
[data-filter-item][data-filtering]{opacity:0;transform:translateY(8px);}

/* ---------- 显现协议 ---------- */
[data-reveal]{
  opacity:0;
  transform:translateY(14px);
  transition:opacity .4s ease, transform .4s cubic-bezier(.2,.7,.3,1);
}
[data-reveal][data-revealed]{opacity:1;transform:none;}
@media (prefers-reduced-motion:reduce){
  [data-reveal]{opacity:1;transform:none;}
}

/* ============================================================
   跳转链接
   ============================================================ */
.skip-link{
  position:fixed;
  left:14px;
  top:-80px;
  z-index:120;
  padding:10px 18px;
  border-radius:0 0 12px 12px;
  background:var(--cyan);
  color:#06131F;
  font-weight:700;
  font-size:14px;
  transition:top .2s ease;
}
.skip-link:focus{top:0;}

/* ============================================================
   头部 —— 框架式导航
   ============================================================ */
.site-header{
  position:fixed;
  top:0;
  left:0;
  right:0;
  z-index:60;
  background:rgba(10,20,48,0.94);
  border-bottom:1px solid rgba(46,242,216,0.18);
}
@supports ((-webkit-backdrop-filter:blur(14px)) or (backdrop-filter:blur(14px))){
  .site-header{
    background:rgba(10,20,48,0.82);
    -webkit-backdrop-filter:blur(14px);
    backdrop-filter:blur(14px);
  }
}

.hdr-strip{
  background:linear-gradient(90deg,rgba(30,79,168,0.6),rgba(10,20,48,0.25) 58%,rgba(255,106,31,0.28));
  border-bottom:1px solid rgba(168,187,221,0.14);
}
.hdr-strip-inner{
  max-width:var(--shell);
  margin:0 auto;
  padding:0 var(--gutter);
  height:28px;
  display:flex;
  align-items:center;
  gap:9px;
}
.strip-dot{
  width:7px;
  height:7px;
  border-radius:50%;
  background:var(--green);
  box-shadow:0 0 0 4px rgba(67,217,138,0.16);
  flex:none;
}
.strip-text{
  font-size:12px;
  letter-spacing:0.04em;
  color:var(--mist);
  white-space:nowrap;
  overflow:hidden;
  text-overflow:ellipsis;
}

.hdr-main{position:relative;}
.hdr-main::before,
.hdr-main::after{
  content:"";
  position:absolute;
  bottom:-7px;
  width:16px;
  height:14px;
  pointer-events:none;
  opacity:0.55;
}
.hdr-main::before{left:10px;border-left:1px solid var(--cyan);border-bottom:1px solid var(--cyan);}
.hdr-main::after{right:10px;border-right:1px solid var(--cyan);border-bottom:1px solid var(--cyan);}

.hdr-inner{
  max-width:var(--shell);
  margin:0 auto;
  padding:0 var(--gutter);
  min-height:58px;
  display:grid;
  grid-template-columns:1fr auto;
  align-items:center;
  gap:14px;
}

.brand{display:flex;align-items:center;gap:10px;min-width:0;}
.brand-mark{
  width:36px;
  height:36px;
  flex:none;
  border-radius:11px;
  display:grid;
  place-items:center;
  font-family:var(--font-display);
  font-weight:800;
  font-size:14px;
  letter-spacing:-0.02em;
  color:#06131F;
  background:linear-gradient(140deg,var(--cyan),#8EF7E6 42%,var(--orange));
  box-shadow:0 0 20px -4px rgba(46,242,216,0.55);
}
.brand-text{display:flex;flex-direction:column;line-height:1.2;min-width:0;}
.brand-name{font-family:var(--font-display);font-weight:700;font-size:16px;letter-spacing:0.02em;}
.brand-tag{
  font-size:11px;
  color:var(--mist);
  letter-spacing:0.02em;
  white-space:nowrap;
  overflow:hidden;
  text-overflow:ellipsis;
}

/* 主导航（移动端默认收起） */
.site-nav{
  display:none;
  position:fixed;
  top:var(--hdr-h);
  left:0;
  right:0;
  max-height:calc(100vh - var(--hdr-h));
  overflow-y:auto;
  padding:14px var(--gutter) 22px;
  background:linear-gradient(180deg,rgba(10,20,48,0.99),rgba(7,16,33,0.99));
  border-bottom:1px solid rgba(46,242,216,0.22);
  box-shadow:0 26px 40px -26px rgba(0,0,0,0.95);
}
.site-header[data-open] .site-nav{display:block;}
.nav-list{display:flex;flex-direction:column;gap:6px;}
.nav-item{display:block;}
.nav-link{
  display:block;
  position:relative;
  padding:13px 14px;
  border-radius:12px;
  background:rgba(255,255,255,0.03);
  color:var(--mist);
  font-size:16px;
  font-weight:500;
  transition:color .2s ease, background .2s ease, box-shadow .2s ease;
}
.nav-link:hover{color:var(--cream);background:rgba(255,255,255,0.07);}
.nav-link[aria-current="page"]{
  color:var(--cream);
  background:rgba(46,242,216,0.1);
  box-shadow:inset 0 0 0 1px rgba(46,242,216,0.4);
}
.nav-foot{display:block;margin-top:16px;}
.nav-foot-note{
  margin-top:10px;
  font-size:12.5px;
  color:var(--mist);
  text-align:center;
  letter-spacing:0.02em;
}

.hdr-actions{display:flex;align-items:center;gap:10px;justify-self:end;}
.hdr-cta{display:none;}

.nav-toggle{
  display:grid;
  place-items:center;
  width:44px;
  height:44px;
  padding:0;
  border-radius:12px;
  border:1px solid rgba(46,242,216,0.38);
  background:rgba(255,255,255,0.05);
  cursor:pointer;
  transition:border-color .2s ease, background .2s ease;
}
.nav-toggle:hover{border-color:var(--cyan);background:rgba(46,242,216,0.12);}
.nav-toggle-box{display:block;position:relative;width:20px;height:14px;}
.nav-toggle-box span{
  position:absolute;
  left:0;
  right:0;
  height:2px;
  border-radius:2px;
  background:var(--cream);
  transition:transform .24s ease, opacity .18s ease;
}
.nav-toggle-box span:nth-child(1){top:0;}
.nav-toggle-box span:nth-child(2){top:6px;}
.nav-toggle-box span:nth-child(3){top:12px;}
.site-header[data-open] .nav-toggle-box span:nth-child(1){transform:translateY(6px) rotate(45deg);}
.site-header[data-open] .nav-toggle-box span:nth-child(2){opacity:0;}
.site-header[data-open] .nav-toggle-box span:nth-child(3){transform:translateY(-6px) rotate(-45deg);}

.scroll-progress{
  position:absolute;
  left:0;
  right:0;
  bottom:-1px;
  height:2px;
  background:rgba(168,187,221,0.12);
  overflow:hidden;
}
.scroll-progress span{
  display:block;
  width:0;
  height:100%;
  background:linear-gradient(90deg,var(--cyan),var(--orange));
  box-shadow:0 0 12px rgba(46,242,216,0.85);
  transition:width .1s linear;
}

/* 桌面端导航展开为横向框架 */
@media (min-width:900px){
  .hdr-strip-inner{height:32px;}
  .hdr-inner{
    grid-template-columns:auto minmax(0,1fr) auto;
    gap:22px;
    min-height:66px;
  }
  .site-nav{
    display:block;
    position:static;
    max-height:none;
    overflow:visible;
    padding:0;
    background:none;
    border:0;
    box-shadow:none;
    justify-self:center;
  }
  .nav-list{flex-direction:row;align-items:center;gap:2px;}
  .nav-link{
    padding:9px 12px;
    border-radius:9px;
    background:transparent;
    font-size:15px;
  }
  .nav-link::after{
    content:"";
    position:absolute;
    left:12px;
    right:12px;
    bottom:3px;
    height:2px;
    border-radius:2px;
    background:var(--cyan);
    transform:scaleX(0);
    transform-origin:left;
    transition:transform .28s cubic-bezier(.2,.7,.3,1);
  }
  .nav-link:hover::after{transform:scaleX(1);}
  .nav-link[aria-current="page"]{
    background:rgba(46,242,216,0.1);
    box-shadow:inset 0 0 0 1px rgba(46,242,216,0.34);
  }
  .nav-link[aria-current="page"]::after{background:var(--orange);transform:scaleX(1);}
  .nav-foot{display:none;}
  .hdr-cta{display:inline-flex;}
  .nav-toggle{display:none;}
}

/* ============================================================
   页脚
   ============================================================ */
.site-footer{
  margin-top:64px;
  background:var(--navy-deep);
  border-top:1px solid var(--line);
}
.ft-inner{
  width:100%;
  max-width:var(--shell);
  margin:0 auto;
  padding-left:var(--gutter);
  padding-right:var(--gutter);
}

/* 蓝色入口区 */
.ft-blue{
  position:relative;
  overflow:hidden;
  border-bottom:1px solid rgba(46,242,216,0.3);
  background-image:
    radial-gradient(120% 170% at 10% -10%, rgba(46,242,216,0.3), transparent 58%),
    radial-gradient(95% 150% at 92% 110%, rgba(255,106,31,0.32), transparent 62%),
    linear-gradient(118deg,#12224D,#1E4FA8 56%,#16386F);
}
.ft-blue::before{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  opacity:0.5;
  background-image:
    linear-gradient(rgba(255,255,255,0.07) 1px,transparent 1px),
    linear-gradient(90deg,rgba(255,255,255,0.07) 1px,transparent 1px);
  background-size:40px 40px;
}
.ft-blue-inner{
  position:relative;
  width:100%;
  max-width:var(--shell);
  margin:0 auto;
  padding:30px var(--gutter) 32px;
  display:grid;
  gap:20px;
}
.ft-blue-kicker{
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:0.24em;
  text-transform:uppercase;
  color:var(--cyan);
}
.ft-blue-title{
  margin:8px 0 10px;
  font-size:clamp(22px,5vw,34px);
  font-weight:800;
  line-height:1.22;
  letter-spacing:-0.02em;
  transform:skewX(-3deg);
  transform-origin:left;
}
.ft-blue-text{
  max-width:54ch;
  font-size:15px;
  color:#DFE8FB;
}
.ft-blue-links{display:flex;flex-wrap:wrap;gap:12px;}
@media (min-width:900px){
  .ft-blue-inner{
    grid-template-columns:minmax(0,1fr) auto;
    align-items:center;
    gap:36px;
    padding:44px var(--gutter);
  }
  .ft-blue-links{flex-direction:column;align-items:stretch;}
}

/* 页脚主体 */
.ft-main{
  padding:40px 0 30px;
  background-image:linear-gradient(180deg,rgba(18,34,77,0.6),rgba(10,20,48,0));
}
.ft-main .ft-inner{display:grid;gap:32px;}
@media (min-width:900px){
  .ft-main .ft-inner{grid-template-columns:minmax(230px,1.05fr) 2fr;gap:52px;}
}
.brand-footer{margin-bottom:0;}
.brand-footer .brand-mark{width:40px;height:40px;border-radius:12px;}
.ft-note{
  margin-top:16px;
  max-width:34ch;
  font-size:14px;
  color:var(--mist);
  line-height:1.8;
}
.ft-columns{
  display:grid;
  gap:26px;
  grid-template-columns:repeat(auto-fit,minmax(140px,1fr));
}
.ft-col-title{
  margin-bottom:12px;
  font-size:12.5px;
  font-weight:700;
  letter-spacing:0.18em;
  color:var(--cyan);
}
.ft-list li + li{margin-top:9px;}
.ft-list a{
  display:inline-flex;
  align-items:center;
  font-size:15px;
  color:var(--mist);
  transition:color .2s ease;
}
.ft-list a::before{
  content:"";
  display:inline-block;
  width:0;
  height:1px;
  margin-right:0;
  background:var(--cyan);
  vertical-align:middle;
  transition:width .24s ease, margin-right .24s ease;
}
.ft-list a:hover{color:var(--cream);}
.ft-list a:hover::before{width:14px;margin-right:8px;}

/* 页脚信息层 */
.ft-foot{
  padding:20px 0 30px;
  border-top:1px solid var(--line);
  background:rgba(7,16,33,0.72);
}
.ft-foot-inner{display:grid;gap:16px;}
@media (min-width:900px){
  .ft-foot-inner{grid-template-columns:minmax(0,1fr) auto;align-items:center;gap:28px;}
}
.ft-contact{font-size:13.5px;color:var(--mist);line-height:1.95;}
.ft-strong{color:var(--cream);font-weight:600;letter-spacing:0.02em;}
.ft-address{color:rgba(168,187,221,0.9);}
.ft-legal{
  display:flex;
  flex-wrap:wrap;
  gap:6px 18px;
  font-family:var(--font-mono);
  font-size:12.5px;
  letter-spacing:0.05em;
  color:rgba(168,187,221,0.88);
}
@media (min-width:900px){
  .ft-legal{flex-direction:column;align-items:flex-end;text-align:right;gap:4px;}
}
.ft-copy,.ft-icp{font-size:12.5px;}

/* ---------- 返回顶部 ---------- */
.back-to-top{
  position:fixed;
  right:16px;
  bottom:22px;
  z-index:50;
  width:46px;
  height:46px;
  display:grid;
  place-items:center;
  border-radius:14px;
  border:1px solid rgba(46,242,216,0.45);
  background:rgba(18,34,77,0.92);
  color:var(--cyan);
  font-size:18px;
  line-height:1;
  cursor:pointer;
  box-shadow:0 14px 30px -18px rgba(0,0,0,0.95);
  opacity:0;
  visibility:hidden;
  transform:translateY(10px);
  transition:opacity .24s ease, transform .24s ease, visibility .24s ease, border-color .2s ease;
}
.back-to-top[data-visible]{opacity:1;visibility:visible;transform:none;}
.back-to-top:hover{border-color:var(--cyan);background:rgba(46,242,216,0.16);}
@media (min-width:900px){
  .back-to-top{right:28px;bottom:30px;}
}