/* =========================================================
   爱体育官网口 · citystand-aitiyu.com.cn
   全站共享样式 /assets/site.css
   ========================================================= */

/* ---------- 1. 变量 ---------- */
:root{
  --ink:#0B1B2B;
  --ink-80:rgba(11,27,43,.82);
  --ink-60:rgba(11,27,43,.6);
  --paper:#F4EFE6;
  --grid:#C9C2B6;
  --copper:#2F6F63;
  --copper-lit:#3C8C7C;
  --hibiscus:#C23A4B;
  --pickle:#E3B23C;
  --data-cyan:#4FA3A5;
  --concrete:#6E6A63;
  --white:#FFFFFF;

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

  --rail-w:250px;
  --rail-bar-h:64px;
  --maxw:1200px;
  --gap-x:clamp(20px,4vw,56px);
  --gap-y:clamp(40px,6vw,88px);
  --ease:cubic-bezier(.2,.7,.3,1);
  --shadow:0 20px 44px -30px rgba(11,27,43,.5);
}

/* ---------- 2. Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0}
img,svg,video,canvas{max-width:100%;display:block}
button,input,select,textarea{font:inherit;color:inherit;margin:0}
button{background:none;border:0}
h1,h2,h3,h4,h5,h6,p,figure,blockquote,dl,dd{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
table{border-collapse:collapse;width:100%}
a{color:var(--copper);text-decoration:none}

/* ---------- 3. 基础排版 ---------- */
body{
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  color:var(--ink);
  background-color:var(--paper);
  background-image:
    linear-gradient(to right, rgba(11,27,43,.05) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(11,27,43,.05) 1px, transparent 1px);
  background-size:72px 72px;
  background-attachment:fixed;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
main{display:block}
#main-content{display:block;position:relative;z-index:1;min-height:60vh}

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

/* ---------- 4. 布局容器与网格 ---------- */
.container{
  width:100%;
  max-width:var(--maxw);
  margin:0 auto;
  padding-left:var(--gap-x);
  padding-right:var(--gap-x);
}
.grid-12{
  display:grid;
  grid-template-columns:repeat(12,minmax(0,1fr));
  gap:clamp(16px,2vw,32px);
}
.col-4{grid-column:span 4}
.col-6{grid-column:span 6}
.col-8{grid-column:span 8}
.col-12{grid-column:span 12}

/* ---------- 5. 通用文字层级 ---------- */
.eyebrow{
  display:block;
  font-family:var(--font-data);
  font-size:11px;
  letter-spacing:.28em;
  text-transform:uppercase;
  color:var(--copper);
  margin-bottom:14px;
}
.section-title{
  font-family:var(--font-display);
  font-size:clamp(24px,3vw,36px);
  font-weight:700;
  line-height:1.28;
  letter-spacing:.01em;
  color:var(--ink);
  margin-bottom:16px;
}
.lede{
  font-size:clamp(16px,1.35vw,19px);
  line-height:1.85;
  color:var(--ink-80);
  max-width:64ch;
}
.num{
  font-family:var(--font-data);
  font-variant-numeric:tabular-nums;
  letter-spacing:.02em;
}
.muted{color:var(--concrete)}
.rule{
  border:0;
  height:1px;
  background:var(--grid);
  margin:clamp(24px,4vw,48px) 0;
}

/* ---------- 6. 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  min-height:44px;
  padding:10px 20px;
  font-family:var(--font-body);
  font-size:13.5px;
  font-weight:600;
  letter-spacing:.08em;
  line-height:1.2;
  text-align:center;
  border:1px solid transparent;
  border-radius:0;
  background:transparent;
  color:var(--ink);
  cursor:pointer;
  transition:background .22s var(--ease),color .22s var(--ease),border-color .22s var(--ease),transform .22s var(--ease);
}
.btn:active{transform:translateY(1px)}
.btn--solid{background:var(--copper);border-color:var(--copper);color:var(--paper)}
.btn--solid:hover{background:var(--copper-lit);border-color:var(--copper-lit);color:var(--white)}
.btn--ghost{background:transparent;border-color:rgba(244,239,230,.36);color:var(--paper)}
.btn--ghost:hover{background:rgba(244,239,230,.1);border-color:var(--paper);color:var(--white)}
.btn--outline{background:transparent;border-color:var(--ink);color:var(--ink)}
.btn--outline:hover{background:var(--ink);border-color:var(--ink);color:var(--paper)}
.btn--alert{background:var(--hibiscus);border-color:var(--hibiscus);color:var(--white)}
.btn--alert:hover{background:#D0475A;border-color:#D0475A;color:var(--white)}
.btn--sm{min-height:36px;padding:7px 14px;font-size:12px;letter-spacing:.1em}

/* ---------- 7. 跳至正文 ---------- */
.skip-link{
  position:fixed;
  left:12px;
  top:8px;
  z-index:200;
  transform:translateY(-180%);
  background:var(--pickle);
  color:var(--ink);
  padding:10px 18px;
  font-size:13px;
  font-weight:700;
  letter-spacing:.06em;
  transition:transform .2s var(--ease);
}
.skip-link:focus{transform:translateY(0)}

/* ---------- 8. 侧边轨道导航 ---------- */
.site-rail{
  position:fixed;
  top:0;
  left:0;
  bottom:0;
  width:var(--rail-w);
  display:flex;
  flex-direction:column;
  background:var(--ink);
  color:var(--paper);
  border-right:1px solid rgba(201,194,182,.16);
  overflow:hidden;
  z-index:60;
}
.rail-top{
  padding:26px 22px 20px;
  border-bottom:1px solid rgba(244,239,230,.14);
}
.rail-brand{display:block}
.rail-brand__coord{
  display:block;
  font-family:var(--font-data);
  font-size:10px;
  letter-spacing:.3em;
  color:var(--data-cyan);
  margin-bottom:10px;
}
.rail-brand__mark{
  display:block;
  font-family:var(--font-display);
  font-size:23px;
  font-weight:700;
  line-height:1.3;
  letter-spacing:.02em;
  color:var(--paper);
  transition:color .2s var(--ease);
}
.rail-brand:hover .rail-brand__mark{color:var(--pickle)}
.rail-brand__sub{
  display:block;
  margin-top:7px;
  font-size:11px;
  letter-spacing:.18em;
  color:rgba(244,239,230,.5);
}

.rail-toggle{
  display:none;
  align-items:center;
  gap:10px;
  padding:8px 12px;
  border:1px solid rgba(244,239,230,.34);
  color:var(--paper);
  font-size:12px;
  letter-spacing:.14em;
  cursor:pointer;
  transition:border-color .2s var(--ease),background .2s var(--ease);
}
.rail-toggle:hover{border-color:var(--paper);background:rgba(244,239,230,.08)}
.rail-toggle__bars{
  position:relative;
  display:block;
  width:18px;
  height:2px;
  background:currentColor;
  transition:background .2s var(--ease);
}
.rail-toggle__bars::before,
.rail-toggle__bars::after{
  content:"";
  position:absolute;
  left:0;
  width:18px;
  height:2px;
  background:currentColor;
  transition:transform .25s var(--ease);
}
.rail-toggle__bars::before{top:-6px}
.rail-toggle__bars::after{top:6px}
.site-rail[data-open] .rail-toggle__bars{background:transparent}
.site-rail[data-open] .rail-toggle__bars::before{transform:translateY(6px) rotate(45deg)}
.site-rail[data-open] .rail-toggle__bars::after{transform:translateY(-6px) rotate(-45deg)}

.rail-panel{
  flex:1 1 auto;
  min-height:0;
  display:flex;
  flex-direction:column;
  gap:22px;
  padding:22px 22px 26px;
  overflow-y:auto;
  overscroll-behavior:contain;
}
.rail-nav__list{display:flex;flex-direction:column}
.rail-nav__list > li{border-bottom:1px solid rgba(244,239,230,.1)}
.rail-nav__list a{
  display:grid;
  grid-template-columns:32px 1fr;
  align-items:center;
  gap:10px;
  padding:12px 6px 12px 10px;
  border-left:2px solid transparent;
  color:rgba(244,239,230,.66);
  font-size:15px;
  line-height:1.3;
  transition:color .22s var(--ease),border-color .22s var(--ease),background .22s var(--ease);
}
.rail-nav__list a:hover{
  color:var(--paper);
  border-left-color:rgba(79,163,165,.65);
  background:rgba(244,239,230,.04);
}
.rail-nav__list a[aria-current="page"]{
  color:var(--paper);
  border-left-color:var(--pickle);
  background:rgba(244,239,230,.06);
}
.rail-nav__coord{
  font-family:var(--font-data);
  font-size:10px;
  letter-spacing:.12em;
  color:var(--concrete);
}
.rail-nav__list a[aria-current="page"] .rail-nav__coord{color:var(--pickle)}
.rail-nav__label{font-weight:500}

.rail-actions{display:flex;flex-direction:column;gap:10px}
.rail-actions .btn{width:100%}
.rail-note{
  margin-top:auto;
  padding-top:18px;
  border-top:1px dashed rgba(244,239,230,.16);
  font-family:var(--font-data);
  font-size:11px;
  letter-spacing:.16em;
  color:rgba(244,239,230,.42);
}

.rail-progress{
  position:absolute;
  left:0;
  top:0;
  bottom:0;
  width:3px;
  background:rgba(244,239,230,.08);
  pointer-events:none;
}
.rail-progress__bar{
  display:block;
  width:100%;
  height:0;
  background:linear-gradient(180deg,var(--data-cyan),var(--copper));
}

@media (min-width:901px){
  body{padding-left:var(--rail-w)}
}

@media (max-width:900px){
  body{padding-top:var(--rail-bar-h)}
  .site-rail{
    top:0;
    left:0;
    right:0;
    bottom:auto;
    width:auto;
    height:var(--rail-bar-h);
    flex-direction:row;
    align-items:center;
    border-right:0;
    border-bottom:1px solid rgba(244,239,230,.16);
  }
  .rail-top{
    display:flex;
    align-items:center;
    justify-content:space-between;
    gap:12px;
    width:100%;
    height:100%;
    padding:0 16px;
    border-bottom:0;
  }
  .rail-brand__coord,
  .rail-brand__sub{display:none}
  .rail-brand__mark{font-size:19px}
  .rail-toggle{display:inline-flex}
  .rail-panel{
    position:fixed;
    left:0;
    right:0;
    top:var(--rail-bar-h);
    bottom:0;
    z-index:59;
    background:var(--ink);
    border-top:1px solid rgba(244,239,230,.12);
    padding:24px 20px 48px;
    overflow-y:auto;
    transform:translateY(-10px);
    opacity:0;
    visibility:hidden;
    transition:opacity .26s var(--ease),transform .26s var(--ease),visibility .26s;
  }
  .site-rail[data-open] .rail-panel{
    opacity:1;
    transform:translateY(0);
    visibility:visible;
  }
  .rail-progress{display:none}
}

/* ---------- 9. 页脚 ---------- */
.site-foot{
  position:relative;
  background:var(--ink);
  color:rgba(244,239,230,.7);
  overflow:hidden;
}
.foot-inner{
  max-width:var(--maxw);
  margin:0 auto;
  padding:clamp(44px,6vw,76px) var(--gap-x) 30px;
  display:grid;
  grid-template-columns:1.25fr 1fr 1.45fr;
  gap:clamp(24px,3vw,56px);
  align-items:start;
}
.foot-brand__mark{
  font-family:var(--font-display);
  font-size:clamp(22px,2.4vw,30px);
  font-weight:700;
  line-height:1.3;
  letter-spacing:.02em;
  color:var(--paper);
}
.foot-brand__line{
  margin-top:8px;
  font-size:13px;
  letter-spacing:.16em;
  color:var(--data-cyan);
}
.foot-brand__coord{
  margin-top:16px;
  font-family:var(--font-data);
  font-size:11px;
  letter-spacing:.2em;
  color:rgba(244,239,230,.36);
}
.foot-nav__title,
.foot-contact__title{
  font-family:var(--font-data);
  font-size:11px;
  font-weight:500;
  letter-spacing:.24em;
  text-transform:uppercase;
  color:var(--pickle);
  margin-bottom:16px;
}
.foot-nav__list{display:flex;flex-direction:column;gap:10px}
.foot-nav__list a{
  font-size:14px;
  color:rgba(244,239,230,.72);
  border-bottom:1px solid transparent;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.foot-nav__list a:hover{color:var(--paper);border-bottom-color:var(--copper-lit)}
.foot-contact__list{display:flex;flex-direction:column;gap:10px}
.foot-contact__list li{
  display:grid;
  grid-template-columns:52px 1fr;
  gap:12px;
  align-items:baseline;
}
.foot-contact__key{
  font-family:var(--font-data);
  font-size:11px;
  letter-spacing:.16em;
  color:rgba(244,239,230,.4);
}
.foot-contact__val{
  font-size:14px;
  color:rgba(244,239,230,.86);
  word-break:break-all;
}
.foot-contact__note{
  margin-top:14px;
  font-size:12px;
  line-height:1.7;
  color:rgba(244,239,230,.42);
}
.foot-meta{
  grid-column:1 / -1;
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:12px 32px;
  margin-top:clamp(20px,3vw,36px);
  padding-top:20px;
  border-top:1px solid rgba(244,239,230,.14);
  font-family:var(--font-data);
  font-size:11.5px;
  letter-spacing:.1em;
  color:rgba(244,239,230,.44);
}
.foot-skyline{
  height:52px;
  background-image:
    repeating-linear-gradient(90deg, rgba(227,178,60,.42) 0 1px, transparent 1px 22px),
    repeating-linear-gradient(90deg, transparent 0 11px, rgba(79,163,165,.34) 11px 12px, transparent 12px 44px);
  background-repeat:repeat-x;
  -webkit-mask-image:linear-gradient(to top,#000 0%,transparent 100%);
  mask-image:linear-gradient(to top,#000 0%,transparent 100%);
}
@media (max-width:900px){
  .foot-inner{grid-template-columns:1fr 1fr}
  .foot-brand{grid-column:1 / -1}
}
@media (max-width:600px){
  .foot-inner{grid-template-columns:1fr}
  .foot-contact__list li{grid-template-columns:1fr;gap:2px}
  .foot-meta{flex-direction:column;align-items:flex-start}
}

/* ---------- 10. 面包屑 ---------- */
.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:10px;
  padding:16px 0;
  margin-bottom:clamp(24px,4vw,48px);
  border-bottom:1px solid var(--grid);
  font-family:var(--font-data);
  font-size:11px;
  letter-spacing:.14em;
  color:var(--concrete);
}
.breadcrumb a{
  color:var(--concrete);
  border-bottom:1px solid transparent;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.breadcrumb a:hover{color:var(--copper);border-bottom-color:var(--copper)}
.breadcrumb__sep{color:var(--grid)}
.breadcrumb [aria-current="page"]{color:var(--ink)}

/* ---------- 11. 卡片与标签 ---------- */
.surface{
  position:relative;
  display:block;
  background:var(--paper);
  border:1px solid var(--grid);
  padding:clamp(18px,2.2vw,28px);
}
.surface--ink{
  background:var(--ink);
  border-color:var(--ink);
  color:rgba(244,239,230,.82);
}
.surface--ink .section-title{color:var(--paper)}
.surface--lift{box-shadow:var(--shadow)}
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 10px;
  border:1px solid var(--grid);
  background:transparent;
  color:var(--concrete);
  font-family:var(--font-data);
  font-size:11px;
  letter-spacing:.14em;
  line-height:1.4;
}
.tag--time{background:var(--pickle);border-color:var(--pickle);color:var(--ink)}
.tag--live{background:var(--hibiscus);border-color:var(--hibiscus);color:var(--white)}
.tag--data{background:var(--data-cyan);border-color:var(--data-cyan);color:var(--ink)}

/* ---------- 12. 筛选条 ---------- */
.filter-bar{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  padding:14px 0;
  border-top:1px solid var(--grid);
  border-bottom:1px solid var(--grid);
  margin-bottom:clamp(20px,3vw,36px);
}
.filter-bar__label{
  margin-right:6px;
  font-family:var(--font-data);
  font-size:11px;
  letter-spacing:.2em;
  color:var(--concrete);
}
.filter-chip{
  appearance:none;
  padding:7px 14px;
  border:1px solid var(--grid);
  background:transparent;
  color:var(--ink);
  font-size:12.5px;
  letter-spacing:.06em;
  cursor:pointer;
  transition:background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease);
}
.filter-chip:hover{border-color:var(--copper);color:var(--copper)}
.filter-chip[aria-pressed="true"]{
  background:var(--copper);
  border-color:var(--copper);
  color:var(--paper);
}
.filter-empty{
  display:none;
  padding:24px 0;
  color:var(--concrete);
  font-size:14px;
}
.filter-empty.is-on{display:block}
[data-filter-item].is-filtered-out{display:none}

/* ---------- 13. 图片容器 ---------- */
.media{
  position:relative;
  display:block;
  width:100%;
  overflow:hidden;
  background:linear-gradient(160deg,#0B1B2B 0%,#13324B 100%);
}
.media > img,
.media > picture,
.media > picture > img{
  display:block;
  width:100%;
  height:100%;
  object-fit:cover;
}
.media--21x9{aspect-ratio:21/9}
.media--16x9{aspect-ratio:16/9}
.media--3x2{aspect-ratio:3/2}
.media--4x3{aspect-ratio:4/3}
.media--1x1{aspect-ratio:1/1}
.media--tall{aspect-ratio:3/4}
.media--grid::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background-image:
    linear-gradient(to right, rgba(244,239,230,.13) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(244,239,230,.13) 1px, transparent 1px);
  background-size:40px 40px;
}
.media__caption{
  position:absolute;
  left:0;
  right:0;
  bottom:0;
  padding:10px 14px;
  font-family:var(--font-data);
  font-size:11px;
  letter-spacing:.14em;
  color:var(--paper);
  background:linear-gradient(to top, rgba(11,27,43,.85), rgba(11,27,43,0));
}
.media__tag{
  position:absolute;
  left:0;
  top:0;
  padding:6px 12px;
  background:var(--pickle);
  color:var(--ink);
  font-family:var(--font-data);
  font-size:11px;
  letter-spacing:.12em;
}

/* ---------- 14. 滚动显现 ---------- */
html.js [data-reveal]{
  opacity:0;
  transform:translateY(22px);
  transition:opacity .7s var(--ease),transform .7s var(--ease);
}
html.js [data-reveal].is-visible{
  opacity:1;
  transform:translateY(0);
}

/* ---------- 15. 减少动效 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.01ms !important;
  }
  html.js [data-reveal]{
    opacity:1 !important;
    transform:none !important;
  }
}

/* ---------- 16. 网格塌陷 ---------- */
@media (max-width:900px){
  .col-4,.col-6,.col-8{grid-column:span 12}
}