/* ==========================================================================
   小鸟体育 · 共享样式 /assets/site.css
   令牌 → 基础排版 → 通用组件 → 侧边轨道头部 → 顶部数据条 → 页脚 → 响应式
   ========================================================================== */

/* ---------- 01 设计令牌 ---------- */
:root{
  --turf:#2FA84F;
  --turf-deep:#11692F;
  --deep:#0B1B3A;
  --deep-2:#16305C;
  --lime:#D8F34A;
  --ember:#FF5A36;
  --cream:#F7F8F3;
  --mint:#E4EBE2;
  --steel:#6B7480;
  --paper:#FFFFFF;
  --away:#35C4C0;

  --ink:#0B1B3A;
  --ink-soft:rgba(11,27,58,.72);
  --on-dark:rgba(247,248,243,.78);
  --on-dark-soft:rgba(247,248,243,.55);
  --line:rgba(11,27,58,.14);
  --line-dark:rgba(247,248,243,.18);

  --font-display:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-body:var(--font-display);
  --font-mono:"JetBrains Mono","Roboto Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,"Courier New",monospace;

  --rail-w:88px;
  --strip-h:56px;
  --bd:1.5px;
  --cut-sm:polygon(10px 0,100% 0,100% calc(100% - 10px),calc(100% - 10px) 100%,0 100%,0 10px);
  --cut-lg:polygon(18px 0,100% 0,100% calc(100% - 18px),calc(100% - 18px) 100%,0 100%,0 18px);
  --shadow-panel:0 26px 50px -34px rgba(11,27,58,.55);
  --ease:180ms cubic-bezier(.25,.7,.3,1);
}

/* ---------- 02 重置 ---------- */
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,blockquote,dl,dd{margin:0;}
ul,ol{padding:0;list-style:none;}
a{color:inherit;text-decoration:none;}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer;}
img,svg,video{display:block;max-width:100%;}
table{border-collapse:collapse;width:100%;}
[hidden]{display:none !important;}

/* ---------- 03 基础排版 ---------- */
body{
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  color:var(--ink);
  background:var(--cream);
  min-height:100vh;
  padding-left:var(--rail-w);
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{
  font-family:var(--font-display);
  font-weight:900;
  line-height:1.14;
  letter-spacing:-.01em;
  color:var(--deep);
  text-wrap:balance;
}
h1{font-size:clamp(34px,5vw,64px);}
h2{font-size:clamp(24px,3.2vw,44px);}
h3{font-size:clamp(19px,2.2vw,28px);}
h4{font-size:20px;}
p{font-size:16px;color:var(--ink-soft);}
strong,b{font-weight:700;color:var(--ink);}
small{font-size:13px;}

:focus-visible{
  outline:2px solid var(--turf);
  outline-offset:3px;
  border-radius:2px;
}
.site-rail :focus-visible,
.site-footer :focus-visible,
.topstrip :focus-visible{outline-color:var(--lime);}

.btn:focus-visible,
.chip:focus-visible,
.to-top:focus-visible,
.skip-link:focus-visible,
.season-btn:focus-visible,
.nav-toggle:focus-visible,
.topstrip-cta:focus-visible{
  outline:none;
  box-shadow:inset 0 0 0 2px var(--lime),inset 0 0 0 4px var(--deep);
}

.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;
}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.06em;}
.num{
  font-family:var(--font-mono);
  font-weight:700;
  font-variant-numeric:tabular-nums;
  letter-spacing:-.02em;
  line-height:1.05;
  color:var(--deep);
}
.num--xl{font-size:clamp(38px,7vw,64px);}
.num--lime{color:var(--lime);}      /* 仅用于深空蓝底色之上 */
.num--ember{color:var(--ember);}    /* 异常值与关键差值 */

/* ---------- 04 容器与区块 ---------- */
.container{
  width:100%;
  max-width:1200px;
  margin-inline:auto;
  padding-inline:clamp(20px,4vw,56px);
}
.section{padding-block:clamp(48px,7vw,88px);}
.section--dark{background:var(--deep);color:var(--on-dark);}
.section--dark h1,.section--dark h2,.section--dark h3,.section--dark h4,.section--dark p{color:var(--on-dark);}
.section--dark h1,.section--dark h2,.section--dark h3,.section--dark h4{color:var(--paper);}
.section--mint{background:var(--mint);}

.grid{display:grid;gap:clamp(16px,2vw,28px);}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr));}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr));}

.kicker{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--font-mono);
  font-size:11px;letter-spacing:.18em;text-transform:uppercase;
  color:var(--turf-deep);
}
.kicker::before{content:"";width:18px;height:2px;background:var(--turf);}
.kicker--dark{color:var(--lime);}
.kicker--dark::before{background:var(--lime);}

.breadcrumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  padding-block:20px;
  font-family:var(--font-mono);
  font-size:11px;letter-spacing:.14em;
  color:var(--steel);
}
.breadcrumb li{display:flex;align-items:center;gap:8px;}
.breadcrumb li::after{content:"/";color:var(--steel);opacity:.55;}
.breadcrumb li:last-child::after{content:"";}
.breadcrumb a{color:var(--turf-deep);transition:color var(--ease);}
.breadcrumb a:hover{color:var(--turf);}

/* ---------- 05 按钮 ---------- */
.btn{
  --btn-bg:var(--turf);
  --btn-fg:#fff;
  --btn-bd:transparent;
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 20px;
  font-size:14px;font-weight:700;line-height:1.2;letter-spacing:.01em;
  text-align:center;
  background:var(--btn-bg);
  color:var(--btn-fg);
  border:var(--bd) solid var(--btn-bd);
  clip-path:var(--cut-sm);
  transition:background-color var(--ease),color var(--ease),border-color var(--ease);
}
.btn:hover{background:var(--turf-deep);}
.btn--solid{--btn-bg:var(--turf);--btn-fg:#fff;}
.btn--solid:hover{--btn-bg:var(--turf-deep);}
.btn--lime{--btn-bg:var(--lime);--btn-fg:var(--deep);}
.btn--lime:hover{--btn-bg:#c8e42f;}
.btn--ghost{--btn-bg:transparent;--btn-fg:var(--lime);--btn-bd:var(--lime);}
.btn--ghost:hover{--btn-bg:var(--lime);--btn-fg:var(--deep);}
.btn--line{--btn-bg:transparent;--btn-fg:var(--deep);--btn-bd:var(--deep);}
.btn--line:hover{--btn-bg:var(--deep);--btn-fg:var(--cream);}
.btn--sm{padding:9px 14px;font-size:13px;}
.btn--block{width:100%;}

/* ---------- 06 面板 / 表格 / 标签 ---------- */
.panel{
  background:var(--paper);
  border:var(--bd) solid var(--line);
  clip-path:var(--cut-lg);
  padding:clamp(20px,2.4vw,32px);
}
.panel--dark{background:var(--deep-2);border-color:var(--line-dark);color:var(--on-dark);}
.panel--dark h2,.panel--dark h3,.panel--dark h4{color:var(--paper);}
.panel--dark p{color:var(--on-dark);}
.panel--turf{background:var(--turf);border-color:transparent;color:#fff;}
.panel--turf h2,.panel--turf h3,.panel--turf h4,.panel--turf p{color:#fff;}
.panel--lime{background:var(--lime);border-color:transparent;color:var(--deep);}
.panel--lime h2,.panel--lime h3,.panel--lime h4,.panel--lime p{color:var(--deep);}
.panel--mint{background:var(--mint);border-color:transparent;}

.ledger{font-family:var(--font-mono);font-size:13px;font-variant-numeric:tabular-nums;}
.ledger caption{
  caption-side:top;text-align:left;padding-bottom:10px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;
  color:var(--turf-deep);text-transform:uppercase;
}
.ledger th{
  background:var(--turf-deep);color:#fff;
  text-align:left;font-weight:700;letter-spacing:.06em;
  padding:10px 14px;white-space:nowrap;
}
.ledger td{padding:10px 14px;border-bottom:1px solid var(--line);color:var(--ink-soft);}
.ledger tbody tr:nth-child(even){background:var(--mint);}
.ledger tbody tr:hover{background:rgba(216,243,74,.32);}

.chip{
  display:inline-flex;align-items:center;gap:6px;
  padding:7px 14px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;
  color:var(--deep);background:var(--paper);
  border:var(--bd) solid var(--line);
  clip-path:var(--cut-sm);
  transition:background-color var(--ease),color var(--ease),border-color var(--ease);
}
.chip:hover{border-color:var(--turf);color:var(--turf-deep);}
.chip[aria-pressed="true"]{
  background:var(--lime);border-color:var(--lime);
  color:var(--deep);font-weight:700;
}
.filter-bar{display:flex;flex-wrap:wrap;gap:8px;align-items:center;}
.empty-hint{
  padding:24px;
  border:var(--bd) dashed var(--line);
  color:var(--steel);
  font-family:var(--font-mono);font-size:13px;text-align:center;
}
.is-filtered{animation:xn-fade-up 180ms ease both;}
@keyframes xn-fade-up{from{opacity:0;transform:translateY(8px);}to{opacity:1;transform:none;}}

/* ---------- 07 图片容器基础规则 ---------- */
.media-frame{
  position:relative;display:block;overflow:hidden;
  background:var(--deep-2);
  border:var(--bd) solid var(--deep-2);
  clip-path:var(--cut-lg);
  aspect-ratio:16/9;
}
.media-frame img{width:100%;height:100%;object-fit:cover;}
.media-frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(158deg,rgba(11,27,58,.58),rgba(47,168,79,.28));
}
.media-frame figcaption{
  position:absolute;left:0;right:0;bottom:0;z-index:2;
  padding:12px 16px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;
  color:var(--cream);
  background:linear-gradient(to top,rgba(11,27,58,.86),transparent);
}
.media-frame--wide{aspect-ratio:16/9;}
.media-frame--tall{aspect-ratio:3/4;}
.media-frame--square{aspect-ratio:1/1;}
.media-frame--crest{
  aspect-ratio:1/1;border-radius:50%;clip-path:none;
  border-color:var(--turf);
}

/* ---------- 08 跳过链接 ---------- */
.skip-link{
  position:fixed;top:10px;left:10px;z-index:200;
  padding:10px 18px;
  background:var(--lime);color:var(--deep);
  font-size:13px;font-weight:700;
  clip-path:var(--cut-sm);
  transform:translateY(-180%);
  transition:transform var(--ease);
}
.skip-link:focus{transform:translateY(0);}

/* ---------- 09 侧边轨道头部 ---------- */
.site-rail{
  position:fixed;top:0;left:0;bottom:0;
  z-index:95;
  width:var(--rail-w);
  display:flex;flex-direction:column;
  gap:24px;
  padding:22px 12px 26px;
  background:var(--deep);
  border-right:var(--bd) solid var(--deep-2);
  overflow-y:auto;
  scrollbar-width:thin;
  scrollbar-color:var(--deep-2) transparent;
}
.rail-progress{
  position:absolute;top:0;right:0;
  width:3px;height:0;
  background:var(--lime);
  transition:height 120ms linear;
}

.rail-head{
  display:flex;flex-direction:column;align-items:center;gap:10px;
  padding-bottom:18px;
  border-bottom:var(--bd) solid var(--deep-2);
}
.rail-brand{display:flex;flex-direction:column;align-items:center;gap:8px;width:100%;}
.rail-mark{display:flex;align-items:flex-end;justify-content:center;gap:3px;height:26px;}
.rail-mark i{display:block;width:5px;background:var(--turf);transform:skewX(-18deg);}
.rail-mark i:nth-child(1){height:16px;}
.rail-mark i:nth-child(2){height:26px;background:var(--lime);}
.rail-mark i:nth-child(3){height:20px;background:var(--away);}
.rail-wordmark{
  font-family:var(--font-display);font-weight:900;
  font-size:15px;line-height:1.2;letter-spacing:.02em;
  color:var(--paper);text-align:center;
}
.rail-sub{
  font-family:var(--font-mono);font-size:9.5px;line-height:1.6;
  letter-spacing:.06em;color:var(--on-dark-soft);text-align:center;
}

.rail-nav{display:flex;flex-direction:column;}
.rail-label{
  margin-bottom:10px;
  font-family:var(--font-mono);font-size:9.5px;
  letter-spacing:.18em;text-transform:uppercase;
  color:rgba(247,248,243,.45);text-align:center;
}
.rail-list{display:flex;flex-direction:column;gap:4px;}
.rail-item{display:block;}
.rail-link{
  position:relative;
  display:flex;flex-direction:column;align-items:center;gap:3px;
  padding:9px 4px;
  color:var(--on-dark-soft);
  transition:color 180ms ease,background-color 180ms ease;
}
.rail-link::before{
  content:"";position:absolute;left:-12px;top:50%;
  width:4px;height:28px;background:var(--turf);
  opacity:0;
  transform:translateY(-50%) scaleY(.25);
  transform-origin:center;
  transition:transform 180ms ease,opacity 180ms ease;
}
.rail-link:hover{color:var(--paper);background:var(--deep-2);}
.rail-link[aria-current="page"]{color:var(--lime);background:var(--deep-2);}
.rail-link[aria-current="page"]::before{opacity:1;transform:translateY(-50%) scaleY(1);}
.rail-num{font-family:var(--font-mono);font-size:9px;letter-spacing:.1em;color:rgba(247,248,243,.4);}
.rail-link[aria-current="page"] .rail-num{color:var(--lime);opacity:.8;}
.rail-text{font-size:13px;font-weight:500;line-height:1.25;text-align:center;}

.rail-season{display:flex;flex-direction:column;}
.season-switch{display:flex;flex-direction:column;gap:6px;}
.season-btn{
  padding:7px 4px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;
  color:rgba(247,248,243,.65);
  border:var(--bd) solid var(--deep-2);
  transition:background-color var(--ease),color var(--ease),border-color var(--ease);
}
.season-btn:hover{border-color:var(--turf);color:var(--paper);}
.season-btn.is-active{
  background:var(--lime);border-color:var(--lime);
  color:var(--deep);font-weight:700;
}

.rail-actions{
  margin-top:auto;
  display:flex;flex-direction:column;gap:8px;
  padding-top:18px;
  border-top:var(--bd) solid var(--deep-2);
}
.rail-actions .btn{padding:10px 6px;font-size:12px;}

/* ---------- 10 顶部数据条与抽屉 ---------- */
.topstrip{display:none;}
.nav-toggle{display:none;}
.nav-toggle-text{font-size:13px;font-weight:700;letter-spacing:.08em;}
.nav-toggle-bars{display:flex;flex-direction:column;gap:3px;width:16px;}
.nav-toggle-bars i{
  display:block;height:2px;background:currentColor;
  transform-origin:left center;
  transition:transform var(--ease),opacity var(--ease);
}
.nav-scrim{display:none;}
.is-nav-open{overflow:hidden;}

/* ---------- 11 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(56px,8vw,110px);
  background:var(--deep);
  color:var(--on-dark);
  font-size:14px;
}
.footer-stripe{
  position:relative;height:20px;overflow:hidden;
  background:var(--deep-2);
}
.footer-stripe::before{
  content:"";position:absolute;inset:0;background:var(--turf);
  clip-path:polygon(0 0,60% 0,50% 100%,0 100%);
}
.footer-stripe::after{
  content:"";position:absolute;inset:0;background:var(--lime);
  clip-path:polygon(60% 0,72% 0,62% 100%,50% 100%);
}
.footer-inner{
  display:grid;
  grid-template-columns:1.5fr 1fr 1fr;
  gap:clamp(24px,4vw,60px);
  padding-block:clamp(36px,5vw,64px) clamp(20px,3vw,36px);
}
.footer-col{min-width:0;}
.footer-wordmark{
  font-family:var(--font-display);font-weight:900;
  font-size:22px;line-height:1.3;letter-spacing:.01em;
  color:var(--paper);
}
.footer-desc{margin-top:12px;max-width:34ch;line-height:1.8;color:var(--on-dark);}
.footer-tag{
  margin-top:14px;
  font-family:var(--font-mono);font-size:10.5px;
  letter-spacing:.16em;color:var(--lime);
}
.footer-title{
  margin-bottom:14px;
  font-family:var(--font-mono);font-size:10.5px;
  letter-spacing:.18em;text-transform:uppercase;
  color:var(--on-dark-soft);
}
.footer-list{display:flex;flex-direction:column;gap:9px;}
.footer-list a{color:var(--on-dark);transition:color var(--ease);}
.footer-list a:hover{color:var(--lime);}

.footer-contact{
  display:flex;flex-wrap:wrap;gap:10px 28px;
  padding-block:20px;
  border-top:var(--bd) solid var(--line-dark);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.04em;
  color:var(--on-dark-soft);
}
.footer-key{
  margin-right:8px;
  font-size:11px;letter-spacing:.12em;
  color:var(--lime);
}
.footer-note{
  padding-bottom:18px;
  font-size:12px;color:rgba(247,248,243,.5);
}
.footer-legal{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px 18px;
  padding-block:18px 30px;
  border-top:var(--bd) solid var(--line-dark);
  font-size:12px;
  color:rgba(247,248,243,.58);
}
.footer-legal a{color:var(--on-dark);transition:color var(--ease);}
.footer-legal a:hover{color:var(--lime);}
.footer-dot{color:var(--turf);}
.to-top{
  margin-left:auto;
  display:inline-flex;align-items:center;gap:8px;
  padding:8px 14px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;
  color:var(--on-dark);
  border:var(--bd) solid var(--line-dark);
  clip-path:var(--cut-sm);
  transition:border-color var(--ease),color var(--ease);
}
.to-top:hover{border-color:var(--lime);color:var(--lime);}

/* ---------- 12 入场显现 ---------- */
[data-reveal]{
  opacity:0;
  transform:translateY(14px);
  transition:opacity 500ms ease,transform 500ms ease;
}
[data-reveal].is-in{opacity:1;transform:none;}

/* ---------- 13 响应式 ---------- */
@media (max-width:1024px){
  .footer-inner{grid-template-columns:repeat(2,minmax(0,1fr));}
}

@media (max-width:900px){
  body{padding-left:0;padding-top:var(--strip-h);}

  .topstrip{
    display:flex;
    position:fixed;top:0;left:0;right:0;z-index:90;
    height:var(--strip-h);
    align-items:center;justify-content:space-between;gap:10px;
    padding:0 12px;
    background:var(--deep);
    border-bottom:var(--bd) solid var(--deep-2);
  }
  .nav-toggle{
    display:inline-flex;align-items:center;gap:8px;
    padding:7px 12px;
    color:var(--cream);
    border:var(--bd) solid var(--deep-2);
    clip-path:var(--cut-sm);
  }
  .nav-toggle:hover{border-color:var(--lime);color:var(--lime);}
  .topstrip-round{
    font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;
    color:var(--on-dark);text-align:center;
  }
  .topstrip-cta{
    padding:7px 12px;
    font-size:13px;font-weight:700;
    background:var(--turf);color:#fff;
    clip-path:var(--cut-sm);
  }
  .topstrip-cta:hover{background:var(--turf-deep);}

  .nav-scrim{
    display:block;
    position:fixed;inset:0;z-index:85;
    background:rgba(11,27,58,.62);
    opacity:0;visibility:hidden;
    transition:opacity 200ms ease,visibility 200ms ease;
  }
  .nav-scrim[data-open]{opacity:1;visibility:visible;}

  .site-rail{
    width:min(300px,86vw);
    gap:20px;
    padding:20px 20px 26px;
    transform:translateX(-102%);
    transition:transform 240ms cubic-bezier(.2,.7,.3,1);
    box-shadow:var(--shadow-panel);
  }
  .site-rail[data-open]{transform:translateX(0);}
  .rail-progress{display:none;}
  .rail-head{flex-direction:row;align-items:center;gap:12px;padding-bottom:14px;}
  .rail-brand{flex-direction:row;align-items:center;gap:10px;width:auto;}
  .rail-wordmark{text-align:left;font-size:16px;}
  .rail-sub{text-align:left;font-size:10px;}
  .rail-label{text-align:left;margin-bottom:8px;}
  .rail-link{flex-direction:row;align-items:center;gap:12px;padding:11px 14px;}
  .rail-link::before{left:0;height:calc(100% - 12px);width:3px;}
  .rail-text{font-size:15px;text-align:left;}
  .rail-num{font-size:11px;}
  .season-switch{flex-direction:row;}
  .season-btn{flex:1;padding:10px 6px;font-size:13px;}
  .rail-actions .btn{padding:12px 14px;font-size:14px;}

  .grid--2,.grid--3{grid-template-columns:1fr;}
  .footer-inner{grid-template-columns:1fr;gap:28px;}
  .to-top{margin-left:0;}
}

@media (max-width:600px){
  .footer-legal{gap:8px 12px;}
  .footer-contact{flex-direction:column;gap:8px;}
}

/* ---------- 14 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:0ms !important;
    transition-delay:0ms !important;
  }
  [data-reveal]{opacity:1;transform:none;}
}