/* ============================================================
   球友会CN · 共享样式 /assets/site.css
   场边深绿底 + 荧光柠檬黄标记 + 侧轨导航 + 画册式留白
   ============================================================ */

:root{
  --pitch:#0B2E1F;          /* 场边深绿 */
  --night:#071A12;          /* 夜场墨绿 */
  --grass:#1E5B3C;          /* 草纹中绿 */
  --lime:#D8F542;           /* 荧光柠檬黄 */
  --chalk:#F4F6F0;          /* 球场白线 */
  --sage:#A8BFAE;           /* 灰绿辅助字 */
  --orange:#FF6A2B;         /* 活力橙 */
  --aqua:#7FE3C4;           /* 天光青 */
  --glass:rgba(18,58,40,.72);
  --sand:#FFF3E0;           /* 暖沙白 */

  --rail:88px;
  --shell:1320px;
  --dur:260ms;
  --ease:cubic-bezier(.22,.61,.36,1);
  --font-display:"Helvetica Neue","Arial Narrow","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,sans-serif;
}

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.75;
  color:var(--chalk);
  background:var(--pitch);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4,p,ul,ol,dl,dd,figure,blockquote{margin:0}
ul,ol{padding:0}
img,svg,video{max-width:100%;display:block}
a{color:inherit}
button{font:inherit;color:inherit}
main{display:block}
::selection{background:var(--lime);color:var(--night)}

/* ---------- 底色与清透渐变 ---------- */
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:-1;
  pointer-events:none;
  background:
    radial-gradient(1100px 620px at 82% -8%, rgba(127,227,196,.12), transparent 60%),
    radial-gradient(820px 520px at 4% 104%, rgba(216,245,66,.10), transparent 58%),
    linear-gradient(168deg,#0E3624 0%,#0B2E1F 44%,#071A12 100%);
}

/* ---------- 顶部滚动进度（由 JS 写 --sp） ---------- */
body::after{
  content:"";
  position:fixed;
  top:0;
  left:0;
  width:100%;
  height:3px;
  z-index:120;
  transform:scaleX(var(--sp,0));
  transform-origin:0 50%;
  background:linear-gradient(90deg,var(--lime),var(--aqua));
  pointer-events:none;
}

/* ---------- 焦点与可达性 ---------- */
:focus-visible{
  outline:2px solid var(--lime);
  outline-offset:3px;
  border-radius:6px;
}
.skip-link{
  position:fixed;
  top:10px;
  left:10px;
  z-index:200;
  transform:translateY(-180%);
  background:var(--lime);
  color:var(--night);
  padding:10px 18px;
  border-radius:10px;
  font-size:14px;
  font-weight:700;
  text-decoration:none;
  transition:transform var(--dur) var(--ease);
}
.skip-link:focus{transform:translateY(0)}

/* ============================================================
   页头 · 移动端为顶部条 + 抽屉，桌面端为 88px 固定侧轨
   ============================================================ */
.site-header{
  position:sticky;
  top:0;
  z-index:100;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:14px;
  height:64px;
  padding:0 16px;
  background:rgba(7,26,18,.94);
  border-bottom:1px solid rgba(244,246,240,.14);
  -webkit-backdrop-filter:saturate(1.2) blur(12px);
  backdrop-filter:saturate(1.2) blur(12px);
}

/* 品牌 */
.rail-brand{
  display:flex;
  align-items:center;
  gap:12px;
  min-width:0;
}
.rail-brand__link{
  display:inline-flex;
  align-items:center;
  gap:10px;
  text-decoration:none;
  color:var(--chalk);
}
.rail-brand__mark{
  position:relative;
  flex:0 0 auto;
  width:30px;
  height:30px;
  border-radius:50%;
  border:2px solid var(--lime);
  background:
    radial-gradient(circle at 50% 50%, var(--lime) 0 4px, transparent 4.5px),
    linear-gradient(180deg,var(--grass),var(--night));
}
.rail-brand__mark::after{
  content:"";
  position:absolute;
  left:0;right:0;top:50%;
  height:1px;
  background:rgba(244,246,240,.45);
}
.rail-brand__name{
  font-family:var(--font-display);
  font-weight:800;
  font-size:17px;
  letter-spacing:-.01em;
  white-space:nowrap;
}
.rail-brand__cn{color:var(--lime);margin-left:2px}
.rail-brand__tagline{display:none}

/* 汉堡 */
.nav-toggle{
  display:inline-flex;
  align-items:center;
  gap:10px;
  padding:8px 14px;
  border-radius:999px;
  border:1px solid rgba(216,245,66,.5);
  background:transparent;
  color:var(--lime);
  font-size:13px;
  letter-spacing:.14em;
  cursor:pointer;
  transition:background var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.nav-toggle:hover{background:rgba(216,245,66,.12);border-color:var(--lime)}
.nav-toggle__bars{
  position:relative;
  display:block;
  width:18px;
  height:2px;
  background:currentColor;
  transition:background var(--dur) var(--ease);
}
.nav-toggle__bars::before,
.nav-toggle__bars::after{
  content:"";
  position:absolute;
  left:0;
  width:18px;
  height:2px;
  background:currentColor;
  transition:transform var(--dur) var(--ease);
}
.nav-toggle__bars::before{top:-6px}
.nav-toggle__bars::after{top:6px}
.site-header[data-open="true"] .nav-toggle__bars{background:transparent}
.site-header[data-open="true"] .nav-toggle__bars::before{transform:translateY(6px) rotate(45deg)}
.site-header[data-open="true"] .nav-toggle__bars::after{transform:translateY(-6px) rotate(-45deg)}
.nav-toggle__label{line-height:1}

/* 抽屉导航（移动端） */
.site-nav{
  position:fixed;
  left:0;
  right:0;
  top:64px;
  z-index:99;
  max-height:calc(100vh - 64px);
  overflow-y:auto;
  padding:22px 22px 30px;
  background:linear-gradient(180deg,rgba(7,26,18,.985),rgba(11,46,31,.975));
  border-bottom:3px solid var(--lime);
  box-shadow:0 24px 60px rgba(0,0,0,.45);
  opacity:0;
  visibility:hidden;
  transform:translateY(-12px);
  transition:opacity 240ms var(--ease),transform 280ms var(--ease),visibility 0s linear 280ms;
}
.site-header[data-open="true"] .site-nav{
  opacity:1;
  visibility:visible;
  transform:none;
  transition:opacity 240ms var(--ease),transform 280ms var(--ease),visibility 0s;
}
.site-nav__list{
  list-style:none;
  display:flex;
  flex-direction:column;
  gap:2px;
}
.site-nav__item{list-style:none}
.site-nav__link{
  position:relative;
  display:flex;
  align-items:baseline;
  gap:14px;
  padding:14px 6px;
  text-decoration:none;
  color:var(--chalk);
  font-family:var(--font-display);
  font-size:19px;
  font-weight:800;
  font-style:italic;
  letter-spacing:-.005em;
  border-bottom:1px solid rgba(244,246,240,.1);
  transition:color var(--dur) var(--ease),padding-left var(--dur) var(--ease);
}
.site-nav__link::before{
  content:"";
  position:absolute;
  left:0;
  top:12px;
  bottom:12px;
  width:3px;
  border-radius:3px;
  background:var(--lime);
  transform:scaleY(0);
  transform-origin:50% 0;
  transition:transform var(--dur) var(--ease);
}
.site-nav__link:hover{color:var(--lime);padding-left:14px}
.site-nav__link:hover::before{transform:scaleY(1)}
.site-nav__link[aria-current="page"]{color:var(--lime)}
.site-nav__link[aria-current="page"]::before{transform:scaleY(1)}
.site-nav__no{
  flex:0 0 auto;
  font-size:11px;
  font-weight:400;
  font-style:normal;
  letter-spacing:.18em;
  color:var(--sage);
  transition:color var(--dur) var(--ease);
}
.site-nav__link:hover .site-nav__no,
.site-nav__link[aria-current="page"] .site-nav__no{color:var(--lime)}
.site-nav__text{display:inline-block}
.site-nav__hint{
  margin:18px 0 16px;
  font-size:12px;
  letter-spacing:.18em;
  color:var(--sage);
  line-height:1.7;
}
.site-nav__cta{width:100%}

/* ============================================================
   页脚
   ============================================================ */
.site-footer{
  position:relative;
  margin-top:clamp(72px,10vw,150px);
  padding:clamp(46px,6vw,86px) clamp(20px,4vw,56px) 30px;
  background:linear-gradient(180deg,var(--night) 0%,#04120C 100%);
  color:var(--chalk);
  border-top:1px solid rgba(244,246,240,.14);
}
.site-footer::before{
  content:"";
  position:absolute;
  top:0;left:0;right:0;
  height:7px;
  background:linear-gradient(90deg,var(--lime) 0 30%,var(--aqua) 30% 48%,var(--orange) 48% 56%,transparent 56%);
  clip-path:polygon(0 0,100% 0,100% 42%,0 100%);
  pointer-events:none;
}
.footer-top{
  display:grid;
  grid-template-columns:1fr;
  gap:clamp(30px,4vw,60px);
  max-width:var(--shell);
  margin:0 auto;
}
.footer-brand{
  display:flex;
  flex-direction:column;
  gap:12px;
}
.footer-brand__link{
  display:inline-flex;
  align-items:center;
  gap:12px;
  text-decoration:none;
  color:var(--chalk);
}
.footer-brand__mark{
  position:relative;
  flex:0 0 auto;
  width:36px;
  height:36px;
  border-radius:50%;
  border:2px solid var(--lime);
  background:
    radial-gradient(circle at 50% 50%, var(--lime) 0 5px, transparent 5.5px),
    linear-gradient(180deg,var(--grass),var(--night));
}
.footer-brand__mark::after{
  content:"";
  position:absolute;
  left:0;right:0;top:50%;
  height:1px;
  background:rgba(244,246,240,.45);
}
.footer-brand__name{
  font-family:var(--font-display);
  font-size:22px;
  font-weight:800;
  letter-spacing:-.01em;
}
.footer-brand__cn{color:var(--lime);margin-left:2px}
.footer-brand__tagline{
  font-size:13px;
  letter-spacing:.18em;
  color:var(--lime);
}
.footer-brand__summary{
  max-width:34ch;
  font-size:15px;
  line-height:1.85;
  color:var(--sage);
}
.footer-nav{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(150px,1fr));
  gap:clamp(24px,3vw,44px);
}
.footer-col__title{
  margin-bottom:14px;
  font-size:12px;
  font-weight:600;
  letter-spacing:.2em;
  color:var(--sage);
}
.footer-col__list{
  list-style:none;
  display:flex;
  flex-direction:column;
  gap:10px;
}
.footer-link{
  display:inline-block;
  font-size:15px;
  color:var(--chalk);
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.footer-link:hover{color:var(--lime);border-bottom-color:var(--lime)}
.footer-mid{
  display:grid;
  gap:20px;
  max-width:var(--shell);
  margin:clamp(30px,4vw,50px) auto 0;
  padding-top:clamp(26px,4vw,42px);
  border-top:1px solid rgba(244,246,240,.12);
}
.footer-contact{
  display:grid;
  grid-template-columns:1fr;
  gap:16px 40px;
}
.footer-contact__item{min-width:0}
.footer-contact dt{
  font-size:11px;
  letter-spacing:.18em;
  color:var(--sage);
  margin-bottom:6px;
}
.footer-contact dd{
  font-size:15px;
  color:var(--chalk);
  word-break:break-word;
}
.footer-contact__note{
  font-size:13px;
  line-height:1.85;
  color:var(--sage);
  max-width:52ch;
}
.footer-bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:14px 24px;
  max-width:var(--shell);
  margin:clamp(28px,4vw,44px) auto 0;
  padding-top:20px;
  border-top:1px solid rgba(244,246,240,.12);
}
.footer-legal{font-size:13px;color:var(--sage)}
.footer-note{flex:1 1 240px;font-size:13px;color:var(--sage)}
.footer-cta{flex:0 0 auto}

/* ============================================================
   通用按钮
   ============================================================ */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:13px 22px;
  border:1px solid transparent;
  border-radius:999px;
  font-family:var(--font-body);
  font-size:15px;
  font-weight:700;
  letter-spacing:.02em;
  line-height:1.2;
  text-decoration:none;
  cursor:pointer;
  transition:transform var(--dur) var(--ease),background var(--dur) var(--ease),
             color var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.btn:active{transform:translateY(1px)}
.btn--accent{background:var(--orange);color:#180800}
.btn--accent:hover{background:#ff8352;transform:translateY(-2px)}
.btn--ghost{background:transparent;color:var(--chalk);border-color:rgba(244,246,240,.35)}
.btn--ghost:hover{border-color:var(--lime);color:var(--lime);transform:translateY(-2px)}
.btn--lime{background:var(--lime);color:var(--night)}
.btn--lime:hover{background:#e6ff6a;transform:translateY(-2px)}

/* ============================================================
   页面通用构件
   ============================================================ */
.shell{
  width:100%;
  max-width:var(--shell);
  margin-inline:auto;
  padding-inline:clamp(20px,4vw,56px);
}
.index-label{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-size:12px;
  letter-spacing:.18em;
  color:var(--lime);
  line-height:1.6;
}
.index-label::before{
  content:"";
  width:22px;
  height:1px;
  background:var(--lime);
}
.display{
  font-family:var(--font-display);
  font-weight:800;
  font-style:italic;
  font-size:clamp(42px,9vw,120px);
  line-height:.94;
  letter-spacing:-.03em;
  color:var(--chalk);
}
.number-mark{
  display:block;
  font-family:var(--font-display);
  font-weight:800;
  font-style:italic;
  font-size:clamp(72px,14vw,180px);
  line-height:.84;
  letter-spacing:-.04em;
  color:transparent;
  -webkit-text-stroke:1.5px rgba(216,245,66,.65);
}
.number-mark--solid{color:var(--lime);-webkit-text-stroke:0}
.prose{
  max-width:34em;
  font-size:17px;
  line-height:1.75;
  color:var(--chalk);
}
.prose p{margin-bottom:1.1em}
.prose p:last-child{margin-bottom:0}
.prose a{color:var(--aqua);text-decoration:underline;text-underline-offset:3px}
.prose a:hover{color:var(--lime)}
.prose ul,.prose ol{padding-left:1.2em;margin-bottom:1.1em}
.grid-75,
.grid-83{
  display:grid;
  grid-template-columns:1fr;
  gap:clamp(24px,4vw,56px);
}
.rule-line{
  height:1px;
  border:0;
  margin:clamp(28px,5vw,64px) 0;
  background:linear-gradient(90deg,rgba(244,246,240,.28),rgba(244,246,240,0));
}

/* 卡片 · 专题研究板 */
.card{
  position:relative;
  padding:clamp(20px,2.6vw,34px);
  background:rgba(30,91,60,.42);
  border:1px solid rgba(244,246,240,.14);
  border-radius:28px 28px 28px 8px;
  transition:transform var(--dur) var(--ease),border-color var(--dur) var(--ease),
             background var(--dur) var(--ease);
}
.card::before{
  content:"";
  position:absolute;
  left:0;
  top:24px;
  bottom:24px;
  width:3px;
  border-radius:3px;
  background:var(--lime);
  transform:scaleY(0);
  transform-origin:50% 0;
  transition:transform var(--dur) var(--ease);
}
.card:hover{
  transform:translateY(-4px);
  border-color:rgba(216,245,66,.45);
  background:rgba(30,91,60,.55);
}
.card:hover::before{transform:scaleY(1)}
.card--flat{
  background:rgba(7,26,18,.62);
  border-radius:14px 28px 28px 28px;
}
.card__title{
  position:relative;
  display:inline-block;
  font-family:var(--font-display);
  font-size:20px;
  font-weight:800;
  letter-spacing:-.01em;
  line-height:1.35;
}
.card__title::after{
  content:"";
  position:absolute;
  left:0;
  bottom:-4px;
  height:2px;
  width:100%;
  background:var(--lime);
  transform:scaleX(0);
  transform-origin:0 50%;
  transition:transform var(--dur) var(--ease);
}
.card:hover .card__title::after{transform:scaleX(1)}
.card__meta{
  margin-top:10px;
  font-size:12px;
  letter-spacing:.14em;
  color:var(--sage);
}

/* 图片容器 */
.media{
  position:relative;
  overflow:hidden;
  border-radius:64px 22px 64px 22px;
  background:linear-gradient(150deg,rgba(30,91,60,.8),rgba(7,26,18,.92));
  isolation:isolate;
}
.media::after{
  content:"";
  position:absolute;
  inset:0;
  z-index:1;
  background:linear-gradient(200deg,rgba(7,26,18,0) 40%,rgba(7,26,18,.55) 100%);
  pointer-events:none;
}
.media__img{
  width:100%;
  height:100%;
  object-fit:cover;
  filter:contrast(1.08) saturate(1.05) brightness(.86);
}
.media--43{aspect-ratio:4/3}
.media--169{aspect-ratio:16/9}
.media--11{aspect-ratio:1/1}
.media--tall{aspect-ratio:3/4}
.media__caption{
  margin-top:10px;
  font-size:12px;
  letter-spacing:.12em;
  color:var(--sage);
}

/* 筛选标签 */
.tag{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:7px 15px;
  border-radius:999px;
  border:1px solid rgba(244,246,240,.22);
  background:transparent;
  color:var(--sage);
  font-size:12px;
  letter-spacing:.12em;
  cursor:pointer;
  transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease),
             background var(--dur) var(--ease);
}
.tag:hover{color:var(--lime);border-color:rgba(216,245,66,.6)}
.tag[aria-pressed="true"]{
  color:var(--night);
  background:var(--lime);
  border-color:var(--lime);
}

/* 面包屑 */
.breadcrumbs{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  list-style:none;
  font-size:12px;
  letter-spacing:.14em;
  color:var(--sage);
}
.breadcrumbs__link{color:var(--sage);text-decoration:none}
.breadcrumbs__link:hover{color:var(--lime)}
.breadcrumbs__sep{color:rgba(168,191,174,.5)}
.breadcrumbs__current{color:var(--chalk)}

/* 入场渐显 */
html[data-js="on"] [data-reveal]{
  opacity:0;
  transform:translateY(16px);
  transition:opacity 320ms var(--ease),transform 320ms var(--ease);
}
html[data-js="on"] [data-reveal].is-visible{
  opacity:1;
  transform:none;
}

/* ============================================================
   平板
   ============================================================ */
@media (min-width:640px){
  .rail-brand__tagline{
    display:block;
    padding-left:14px;
    border-left:1px solid rgba(244,246,240,.18);
    font-size:12px;
    letter-spacing:.16em;
    color:var(--sage);
    white-space:nowrap;
  }
  .footer-contact{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (min-width:768px){
  .footer-contact{grid-template-columns:repeat(3,minmax(0,1fr))}
}

/* ============================================================
   桌面端 · 侧轨导航
   ============================================================ */
@media (min-width:1024px){
  body{padding-left:var(--rail)}
  body::after{left:var(--rail);width:calc(100% - var(--rail))}

  .site-header{
    position:fixed;
    top:0;
    left:0;
    bottom:0;
    width:var(--rail);
    height:auto;
    flex-direction:column;
    align-items:stretch;
    justify-content:flex-start;
    gap:0;
    padding:20px 0 16px;
    background:linear-gradient(180deg,#071A12 0%,#0B2E1F 100%);
    border-bottom:0;
    border-right:1px solid rgba(244,246,240,.16);
    -webkit-backdrop-filter:none;
    backdrop-filter:none;
  }

  .rail-brand{
    flex-direction:column;
    align-items:center;
    gap:10px;
    padding:0 6px 16px;
    border-bottom:1px solid rgba(244,246,240,.14);
  }
  .rail-brand__link{flex-direction:column;gap:8px;text-align:center}
  .rail-brand__name{
    font-size:12px;
    line-height:1.3;
    letter-spacing:0;
    white-space:normal;
  }
  .rail-brand__tagline{display:none}

  .nav-toggle{display:none}

  .site-nav{
    position:static;
    flex:1 1 auto;
    display:flex;
    flex-direction:column;
    width:100%;
    max-height:none;
    overflow:visible;
    padding:0;
    background:none;
    border-bottom:0;
    box-shadow:none;
    opacity:1;
    visibility:visible;
    transform:none;
    transition:none;
  }
  .site-nav__list{
    flex:1 1 auto;
    justify-content:center;
    gap:4px;
    padding:0 8px;
  }
  .site-nav__link{
    flex-direction:column;
    align-items:center;
    gap:4px;
    padding:11px 2px;
    font-size:12px;
    letter-spacing:.04em;
    border-bottom:0;
    border-radius:10px;
  }
  .site-nav__link::before{top:8px;bottom:8px;border-radius:0 3px 3px 0}
  .site-nav__link:hover{padding-left:2px;background:rgba(216,245,66,.08)}
  .site-nav__link[aria-current="page"]{background:rgba(216,245,66,.08)}
  .site-nav__no{font-size:10px;letter-spacing:.12em}
  .site-nav__hint{display:none}
  .site-nav__cta{
    width:calc(100% - 20px);
    margin:10px 10px 0;
    padding:10px 4px;
    font-size:12px;
  }

  .grid-75{grid-template-columns:7fr 5fr}
  .grid-83{grid-template-columns:8fr 3fr}
  .footer-top{grid-template-columns:minmax(240px,1fr) 2.2fr}
  .footer-mid{grid-template-columns:minmax(0,2fr) minmax(0,1fr);align-items:start}
}

@media (min-width:1280px){
  .footer-mid{grid-template-columns:minmax(0,2.4fr) minmax(0,1fr)}
}

/* ============================================================
   降低动效
   ============================================================ */
@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[data-js="on"] [data-reveal]{opacity:1;transform:none}
  body::after{display:none}
  .card:hover{transform:none}
  .btn:hover{transform:none}
}