/* ==========================================================================
   SITE KIT — 万博体育MAN中国官方网站
   侧边品牌轨道 / 框架式导航 / 深墨蓝 · 电竞荧光青 · 跃动橙
   ========================================================================== */

/* ---------- 1. 变量 ---------- */
:root{
  --navy:#0B1B33;
  --navy-deep:#071226;
  --panel:#102A4C;
  --cyan:#00E5FF;
  --orange:#FF6A2A;
  --graphite:#2B3440;
  --white:#F4F8FF;
  --mist:#6C7A8F;
  --mint:#2EE6A8;
  --violet:#7C5CFF;
  --amber:#FFB020;
  --ice:#D9F7FF;

  --line:rgba(244,248,255,.14);
  --line-strong:rgba(244,248,255,.28);
  --line-cyan:rgba(0,229,255,.34);

  --rail-w:272px;
  --shell:1180px;

  --font-display:"PingFang SC","Hiragino Sans GB","Noto Sans SC","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"SFMono-Regular",Menlo,Consolas,"Liberation Mono","Courier New",monospace;

  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ---------- 2. 重置 ---------- */
*,*::before,*::after{box-sizing:border-box;}
html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
}
body{
  margin:0;
  background:var(--navy);
  color:var(--white);
  font-family:var(--font-body);
  font-size:16px;
  font-weight:400;
  line-height:1.75;
  letter-spacing:.01em;
}
img,svg{display:block;max-width:100%;height:auto;}
a{color:inherit;text-decoration:none;}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer;}
ul,ol{margin:0;padding:0;list-style:none;}
h1,h2,h3,h4,h5,h6,p,figure{margin:0;}
table{border-collapse:collapse;width:100%;}
:focus-visible{outline:2px solid var(--cyan);outline-offset:2px;}

/* ---------- 3. 中文排版 ---------- */
h1,h2,h3,h4{
  font-family:var(--font-display);
  font-weight:800;
  line-height:1.16;
  letter-spacing:-.01em;
  color:var(--white);
}
h1{font-size:clamp(30px,5vw,54px);letter-spacing:-.02em;}
h2{font-size:clamp(23px,3vw,34px);}
h3{font-size:clamp(18px,2vw,22px);font-weight:700;}
p{max-width:72ch;}
strong{font-weight:700;color:var(--white);}
code,kbd,samp,.mono{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  font-size:.94em;
}

/* ---------- 4. 跳转与骨架 ---------- */
.skip-link{
  position:absolute;
  left:10px;
  top:-120px;
  z-index:140;
  padding:10px 18px;
  background:var(--cyan);
  color:var(--navy-deep);
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:700;
  letter-spacing:.12em;
  border:1px solid var(--navy-deep);
  transition:top .18s var(--ease);
}
.skip-link:focus{top:10px;}

#main-content{scroll-margin-top:86px;}

.shell{
  width:100%;
  max-width:var(--shell);
  margin:0 auto;
  padding-inline:20px;
}

/* ---------- 5. 页头 · 品牌轨道 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:90;
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  padding:12px 16px;
  background:var(--navy-deep);
  border-bottom:1px solid var(--line-cyan);
  box-shadow:0 1px 0 0 rgba(0,229,255,.08);
}

/* 品牌 */
.brand{
  display:flex;
  align-items:center;
  gap:12px;
  min-width:0;
}
.brand-link{
  display:flex;
  align-items:center;
  gap:11px;
  min-width:0;
}
.brand-mark{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  width:44px;
  height:44px;
  flex:0 0 auto;
  background:var(--cyan);
  color:var(--navy-deep);
  font-family:var(--font-mono);
  font-size:13px;
  font-weight:700;
  letter-spacing:-.02em;
}
.brand-text{
  display:flex;
  flex-direction:column;
  line-height:1.22;
  min-width:0;
}
.brand-title{
  font-family:var(--font-display);
  font-size:17px;
  font-weight:800;
  letter-spacing:.08em;
  color:var(--white);
  white-space:nowrap;
}
.brand-sub{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.16em;
  color:var(--mist);
  text-transform:uppercase;
  white-space:nowrap;
}
.brand-tagline{display:none;}

/* 移动端开关 */
.nav-toggle{
  display:inline-flex;
  align-items:center;
  gap:10px;
  padding:9px 12px;
  border:1px solid var(--graphite);
  background:rgba(16,42,76,.6);
  color:var(--white);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  transition:border-color .18s var(--ease),color .18s var(--ease);
}
.nav-toggle:hover{border-color:var(--cyan);color:var(--cyan);}
.nav-toggle-box{
  display:flex;
  flex-direction:column;
  justify-content:center;
  gap:5px;
  width:20px;
  height:14px;
}
.nav-toggle-bar{
  display:block;
  height:2px;
  background:var(--cyan);
  transition:transform .22s var(--ease),opacity .22s var(--ease);
}
.site-header[data-open] .nav-toggle-bar:first-child{transform:translateY(3.5px) rotate(45deg);}
.site-header[data-open] .nav-toggle-bar:last-child{transform:translateY(-3.5px) rotate(-45deg);}

/* 导航 */
.site-nav{
  display:none;
  flex-direction:column;
  gap:2px;
  width:100%;
  padding:10px 0 6px;
  margin-top:4px;
  border-top:1px solid var(--line);
}
.site-header[data-open] .site-nav{display:flex;}
.site-nav[data-open]{display:flex;}
.nav-list{display:flex;flex-direction:column;gap:2px;}
.nav-item{display:block;}
.nav-link{
  display:flex;
  align-items:baseline;
  gap:12px;
  padding:12px 12px;
  color:var(--white);
  font-size:15px;
  letter-spacing:.04em;
  border-left:2px solid transparent;
  transition:background .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease);
}
.nav-index{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.08em;
  color:var(--mist);
  transition:color .18s var(--ease);
}
.nav-text{flex:1 1 auto;min-width:0;}
.nav-link:hover{
  background:rgba(0,229,255,.09);
  border-left-color:var(--cyan);
  color:var(--white);
}
.nav-link:hover .nav-index{color:var(--cyan);}
.nav-link[aria-current="page"]{
  background:var(--cyan);
  color:var(--navy-deep);
  font-weight:700;
  border-left-color:var(--orange);
}
.nav-link[aria-current="page"] .nav-index{color:rgba(7,18,38,.62);}
.nav-link[aria-current="page"]:hover{background:var(--cyan);}

/* 侧栏 CTA */
.rail-cta{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  margin-top:16px;
  padding:13px 18px;
  background:var(--orange);
  color:#1A0700;
  font-family:var(--font-display);
  font-size:14px;
  font-weight:700;
  letter-spacing:.1em;
  border:1px solid var(--orange);
  transition:background .18s var(--ease),color .18s var(--ease);
}
.rail-cta:hover{background:transparent;color:var(--orange);}

/* 轨道刻度（仅桌面显示） */
.rail-foot{display:none;}
.rail-code{
  font-family:var(--font-mono);
  font-size:9.5px;
  letter-spacing:.2em;
  color:var(--mist);
  text-transform:uppercase;
  white-space:nowrap;
}
.rail-ticks{
  flex:1 1 auto;
  height:8px;
  background-image:repeating-linear-gradient(
    90deg,
    rgba(0,229,255,.45) 0 1px,
    transparent 1px 8px
  );
}

@media (max-width:1023px){
  .site-nav{max-height:calc(100vh - 78px);overflow-y:auto;}
}

/* ---------- 6. 页头 · 桌面侧边轨道 ---------- */
@media (min-width:1024px){
  body{padding-left:var(--rail-w);}

  .site-header{
    position:fixed;
    inset:0 auto 0 0;
    width:var(--rail-w);
    height:100vh;
    flex-wrap:nowrap;
    flex-direction:column;
    align-items:stretch;
    justify-content:flex-start;
    gap:0;
    padding:34px 22px 24px;
    border-bottom:0;
    border-right:1px solid var(--line-cyan);
    background:linear-gradient(180deg,#071226 0%,#0B1B33 58%,#071226 100%);
    overflow-y:auto;
    overscroll-behavior:contain;
  }

  .brand{
    flex-direction:column;
    align-items:flex-start;
    gap:16px;
  }
  .brand-tagline{
    display:block;
    max-width:24ch;
    padding-left:11px;
    border-left:2px solid var(--orange);
    font-size:12px;
    line-height:1.7;
    color:var(--mist);
  }

  .nav-toggle{display:none;}

  .site-nav{
    display:flex;
    flex-direction:column;
    width:auto;
    margin-top:30px;
    padding:24px 0 0;
    border-top:1px solid var(--line);
  }
  .nav-link{padding:11px 12px;}
  .rail-cta{margin-top:24px;}

  .rail-foot{
    display:flex;
    align-items:center;
    gap:10px;
    margin-top:auto;
    padding-top:26px;
    border-top:1px solid var(--line);
  }

  #main-content{scroll-margin-top:0;}
}

/* ---------- 7. 页脚 ---------- */
.site-footer{
  margin-top:72px;
  background:var(--navy-deep);
  border-top:1px solid var(--line-cyan);
  color:var(--mist);
}
.footer-grid{
  display:grid;
  grid-template-columns:1fr;
  gap:32px;
  padding-block:46px 32px;
}
.footer-col{min-width:0;}
.footer-col--brand{border-left:2px solid var(--cyan);padding-left:16px;}
.footer-title{
  font-family:var(--font-display);
  font-size:19px;
  font-weight:800;
  letter-spacing:.06em;
  color:var(--white);
  margin-bottom:14px;
}
.footer-note{
  font-size:13.5px;
  line-height:1.85;
  color:var(--mist);
  max-width:46ch;
}
.footer-note + .footer-note{margin-top:10px;}
.footer-heading{
  font-family:var(--font-mono);
  font-size:10.5px;
  font-weight:700;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--cyan);
  padding-bottom:11px;
  margin-bottom:16px;
  border-bottom:1px solid var(--line);
}
.footer-list{display:flex;flex-direction:column;gap:11px;}
.footer-link{
  font-size:14px;
  color:#A9B6C7;
  transition:color .18s var(--ease);
}
.footer-link:hover{color:var(--cyan);}
.footer-contact{display:flex;flex-direction:column;gap:14px;}
.footer-contact li{display:flex;flex-direction:column;gap:4px;}
.footer-key{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.2em;
  color:var(--mist);
  text-transform:uppercase;
}
.footer-val{
  font-size:13.5px;
  line-height:1.6;
  color:var(--white);
  word-break:break-word;
}
.footer-base{
  display:flex;
  flex-direction:column;
  gap:8px;
  padding-block:18px 28px;
  border-top:1px solid var(--line);
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.1em;
  color:var(--mist);
}
.footer-meta{color:#8E9BB0;}
.footer-legal{color:var(--mist);}

@media (min-width:720px){
  .footer-grid{grid-template-columns:1.6fr 1fr 1fr;gap:34px;}
  .footer-base{
    flex-direction:row;
    align-items:center;
    justify-content:space-between;
  }
}
@media (min-width:1024px){
  .footer-grid{
    grid-template-columns:1.75fr 1fr 1fr 1.35fr;
    gap:42px;
    padding-block:66px 46px;
  }
}

/* ---------- 8. 通用按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:12px 22px;
  font-family:var(--font-display);
  font-size:14px;
  font-weight:700;
  letter-spacing:.08em;
  border:1px solid transparent;
  transition:background .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease);
}
.btn--primary{background:var(--cyan);color:var(--navy-deep);border-color:var(--cyan);}
.btn--primary:hover{background:transparent;color:var(--cyan);}
.btn--ghost{background:transparent;color:var(--white);border-color:var(--graphite);}
.btn--ghost:hover{border-color:var(--orange);color:var(--orange);}

/* ---------- 9. 面包屑 ---------- */
.breadcrumb{
  margin-top:22px;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.1em;
  color:var(--mist);
}
.breadcrumb ol{display:flex;flex-wrap:wrap;gap:8px;}
.breadcrumb li{display:inline-flex;align-items:center;gap:8px;}
.breadcrumb li + li::before{content:"/";color:var(--graphite);}
.breadcrumb a{color:var(--mist);transition:color .18s var(--ease);}
.breadcrumb a:hover{color:var(--cyan);}

/* ---------- 10. 章节与网格 ---------- */
.section{padding-block:54px;}
.section__head{
  display:flex;
  flex-direction:column;
  gap:10px;
  margin-bottom:28px;
}
.eyebrow{
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:700;
  letter-spacing:.26em;
  text-transform:uppercase;
  color:var(--orange);
}
.grid{display:grid;grid-template-columns:1fr;gap:18px;}

@media (min-width:720px){
  .grid--2{grid-template-columns:repeat(2,minmax(0,1fr));}
  .grid--3{grid-template-columns:repeat(3,minmax(0,1fr));}
}
@media (min-width:1024px){
  .section{padding-block:82px;}
}

/* ---------- 11. 面板卡片 ---------- */
.panel{
  position:relative;
  background:var(--panel);
  border:1px solid var(--line);
  padding:22px;
}
.panel__head{
  display:flex;
  align-items:baseline;
  justify-content:space-between;
  gap:14px;
  padding-bottom:12px;
  margin-bottom:14px;
  border-bottom:1px solid var(--line);
}
.panel__label{
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:700;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--cyan);
}
.panel__meta{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.08em;
  color:var(--mist);
}

/* ---------- 12. 标签 ---------- */
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:3px 9px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  border:1px solid var(--graphite);
  color:var(--white);
}
.tag--cyan{border-color:var(--line-cyan);color:var(--cyan);background:rgba(0,229,255,.08);}
.tag--orange{border-color:rgba(255,106,42,.55);color:var(--orange);background:rgba(255,106,42,.09);}

/* ---------- 13. 图片容器基础规则 ---------- */
.media-frame{
  position:relative;
  overflow:hidden;
  aspect-ratio:16 / 10;
  background:linear-gradient(135deg,var(--panel) 0%,var(--navy-deep) 100%);
  border:1px solid var(--line);
  border-left:2px solid var(--cyan);
}
.media-frame img{
  width:100%;
  height:100%;
  object-fit:cover;
}
.media-frame::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background:
    radial-gradient(120% 90% at 72% 0%,rgba(0,229,255,.16),transparent 62%),
    linear-gradient(180deg,transparent 52%,rgba(7,18,38,.74) 100%);
}
.media-frame--tall{aspect-ratio:3 / 4;}
.media-frame--wide{aspect-ratio:21 / 9;}

/* ---------- 14. 滚动显现 ---------- */
.reveal{opacity:1;transform:none;}
.has-js [data-reveal]{
  opacity:0;
  transform:translateY(10px);
  transition:opacity .5s var(--ease),transform .5s var(--ease);
}
.has-js [data-reveal].is-visible{
  opacity:1;
  transform:none;
}

/* ---------- 15. 动效降级 ---------- */
@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;
  }
  .has-js [data-reveal]{opacity:1;transform:none;}
}