/* ==========================================================================
   米兰体育场 · 共享样式表  /assets/site.css
   深场黑底 + 切角面板 + 米兰红基因带 + 电光蓝/荧光绿数据高亮
   ========================================================================== */

/* 1. 设计变量 ------------------------------------------------------------- */
:root{
  --bg:#0A0C10;
  --panel:#14171D;
  --panel-hi:#181D25;
  --line:#262B34;
  --line-hi:#31384A;
  --red:#C8102E;
  --red-deep:#7B0A1D;
  --blue:#2F9BFF;
  --green:#35E39A;
  --amber:#FFB020;
  --ink:#F2F5F9;
  --white:#FFFFFF;
  --muted:#98A2B3;
  --focus:#7FD3FF;
  --gold:#C9A227;

  --font-body:"PingFang SC","HarmonyOS Sans SC","Source Han Sans SC","Noto Sans SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"IBM Plex Mono","JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  --fs-xs:12px;
  --fs-sm:15px;
  --fs-md:19px;
  --fs-lg:24px;
  --fs-xl:30px;
  --fs-2xl:clamp(28px,3.4vw,38px);
  --fs-3xl:clamp(32px,4.4vw,48px);
  --fs-4xl:clamp(38px,5.6vw,60px);
  --fs-5xl:clamp(42px,6.6vw,76px);

  --wrap:1240px;
  --gutter:clamp(20px,4vw,40px);
  --gap-block:clamp(16px,2vw,24px);

  --cut:12px;
  --cut-sm:8px;
  --clip-cut:polygon(12px 0,100% 0,100% calc(100% - 12px),calc(100% - 12px) 100%,0 100%,0 12px);
  --clip-cut-sm:polygon(8px 0,100% 0,100% calc(100% - 8px),calc(100% - 8px) 100%,0 100%,0 8px);

  --ease:160ms cubic-bezier(.4,0,.2,1);
}

/* 2. 重置与中文排版 ------------------------------------------------------- */
*,*::before,*::after{box-sizing:border-box}

html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:76px;
}

body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font-family:var(--font-body);
  font-size:var(--fs-md);
  line-height:1.85;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  overflow-x:hidden;
}

h1,h2,h3,h4,p,figure,blockquote,dl,dd{margin:0}
ul,ol{list-style:none;margin:0;padding:0}

img,svg,video{max-width:100%}
img{height:auto}

a{color:var(--blue);text-decoration:none}
a:hover{color:var(--focus)}

button{font:inherit;color:inherit}

:focus-visible{
  outline:2px solid var(--focus);
  outline-offset:2px;
  border-radius:2px;
}

::selection{background:rgba(200,16,46,.55);color:var(--white)}

/* 3. 无障碍工具 ----------------------------------------------------------- */
.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;
}

.skip-link{
  position:absolute;
  top:-120px;
  left:16px;
  z-index:200;
  padding:12px 20px;
  background:var(--blue);
  color:#06192B;
  font-size:var(--fs-sm);
  font-weight:700;
  letter-spacing:.04em;
  transition:top var(--ease);
}
.skip-link:focus{top:14px;color:#06192B}

/* 4. 布局容器与网格 ------------------------------------------------------- */
.wrap{
  width:min(100%,calc(var(--wrap) + var(--gutter) * 2));
  margin-inline:auto;
  padding-inline:var(--gutter);
}

.section{padding:clamp(48px,7vw,88px) 0}
.section--tight{padding:clamp(30px,4.6vw,54px) 0}

.section-head{
  display:flex;
  flex-wrap:wrap;
  align-items:flex-end;
  justify-content:space-between;
  gap:20px;
  margin-bottom:clamp(22px,3vw,40px);
}

.stack{display:flex;flex-direction:column;gap:var(--gap,16px)}
.row{display:flex;flex-wrap:wrap;align-items:center;gap:var(--gap,16px)}
.row--between{justify-content:space-between}

.grid-12{
  display:grid;
  grid-template-columns:repeat(12,minmax(0,1fr));
  gap:var(--gap-block);
}
.col-3{grid-column:span 3}
.col-4{grid-column:span 4}
.col-5{grid-column:span 5}
.col-6{grid-column:span 6}
.col-7{grid-column:span 7}
.col-8{grid-column:span 8}
.col-9{grid-column:span 9}
.col-12{grid-column:span 12}

/* 5. 头部：居中刊头导航 --------------------------------------------------- */
.site-header{
  position:relative;
  z-index:60;
  background:
    radial-gradient(1100px 200px at 50% -90px,rgba(200,16,46,.26),transparent 72%),
    linear-gradient(180deg,#0C1016,#0A0C10);
  border-bottom:1px solid var(--line);
}

.header-stripe{
  height:6px;
  background:repeating-linear-gradient(90deg,var(--red) 0 18px,#0A0C10 18px 36px);
}

.masthead{
  display:grid;
  grid-template-columns:1fr auto 1fr;
  align-items:center;
  gap:20px;
  padding:20px 0 16px;
}

.masthead-brand{text-align:center;min-width:0}

.brand{
  display:inline-flex;
  align-items:center;
  gap:12px;
  color:var(--white);
  text-decoration:none;
}
.brand:hover{color:var(--white)}

.brand-mark{
  width:20px;height:20px;
  flex:none;
  background:repeating-linear-gradient(45deg,var(--red) 0 5px,#0A0C10 5px 10px);
  border:1px solid var(--red-deep);
  clip-path:polygon(6px 0,100% 0,100% calc(100% - 6px),calc(100% - 6px) 100%,0 100%,0 6px);
}

.brand-text{
  font-size:clamp(26px,3.2vw,38px);
  font-weight:900;
  letter-spacing:-.02em;
  line-height:1;
}

.brand-tagline{
  margin:10px 0 0;
  font-size:var(--fs-xs);
  letter-spacing:.18em;
  color:var(--muted);
}

.masthead-side{
  display:flex;
  align-items:center;
  gap:20px;
  font-size:var(--fs-xs);
  letter-spacing:.16em;
}
.masthead-side--right{justify-content:flex-end}

.util-link{
  color:var(--muted);
  padding-bottom:3px;
  border-bottom:1px solid transparent;
  transition:color var(--ease),border-color var(--ease);
}
.util-link:hover{color:var(--ink);border-bottom-color:var(--blue)}

.masthead-nav{
  position:sticky;
  top:0;
  z-index:80;
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
  background:rgba(10,12,16,.94);
  -webkit-backdrop-filter:blur(12px);
  backdrop-filter:blur(12px);
}

.nav-inner{
  position:relative;
  display:flex;
  align-items:center;
  justify-content:center;
  min-height:58px;
}

.nav-list{
  display:flex;
  align-items:center;
  gap:4px;
}

.nav-link{
  position:relative;
  display:block;
  padding:18px 16px;
  font-size:var(--fs-sm);
  letter-spacing:.04em;
  color:#C3CBD8;
  transition:color var(--ease);
}
.nav-link::after{
  content:"";
  position:absolute;
  left:16px;right:16px;bottom:0;
  height:2px;
  background:var(--red);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform var(--ease);
}
.nav-link:hover{color:var(--white)}
.nav-link:hover::after{transform:scaleX(1)}
.nav-link[aria-current="page"]{color:var(--white);font-weight:600}
.nav-link[aria-current="page"]::after{
  background:var(--blue);
  transform:scaleX(1);
}

.nav-toggle{
  display:none;
  align-items:center;
  gap:10px;
  padding:9px 14px;
  background:transparent;
  border:1px solid var(--line);
  border-left:3px solid var(--red);
  color:var(--ink);
  font-size:var(--fs-xs);
  letter-spacing:.18em;
  cursor:pointer;
  transition:border-color var(--ease),background var(--ease);
}
.nav-toggle:hover{background:rgba(47,155,255,.1);border-color:var(--line-hi);border-left-color:var(--blue)}

.nav-toggle-bars{display:inline-flex;flex-direction:column;gap:3px;width:16px}
.nav-toggle-bars > span{display:block;height:2px;background:currentColor}

.nav-toggle-text{line-height:1}

.scroll-progress{
  position:absolute;
  left:0;right:0;bottom:-1px;
  height:2px;
  overflow:hidden;
  pointer-events:none;
}
.scroll-progress [data-progress-bar]{
  display:block;
  width:100%;height:100%;
  transform:scaleX(0);
  transform-origin:0 50%;
  background:linear-gradient(90deg,var(--red),var(--blue) 55%,var(--green));
}

/* 6. 页脚 ----------------------------------------------------------------- */
.site-footer{
  margin-top:clamp(56px,8vw,96px);
  background:linear-gradient(180deg,#0A0C10,#05070A);
  border-top:1px solid var(--line);
}

.footer-stripe{
  height:6px;
  background:repeating-linear-gradient(90deg,#05070A 0 18px,var(--red) 18px 36px);
}

.footer-main{
  display:grid;
  grid-template-columns:minmax(0,1.5fr) repeat(3,minmax(0,1fr));
  gap:clamp(24px,4vw,56px);
  padding:clamp(40px,6vw,64px) 0 32px;
}

.footer-brand-name{
  font-size:var(--fs-lg);
  font-weight:900;
  letter-spacing:-.02em;
  color:var(--white);
  line-height:1.2;
}

.footer-closing{
  margin:10px 0 20px;
  font-size:var(--fs-sm);
  letter-spacing:.06em;
  color:var(--muted);
}

.footer-cta{margin-top:2px}

.footer-col-title{
  margin-bottom:16px;
  font-size:var(--fs-xs);
  font-weight:600;
  letter-spacing:.18em;
  color:var(--blue);
}

.footer-links{display:flex;flex-direction:column;gap:10px}

.footer-link{
  display:inline-block;
  font-size:var(--fs-sm);
  color:#C3CBD8;
  border-bottom:1px solid transparent;
  transition:color var(--ease),border-color var(--ease);
}
.footer-link:hover{color:var(--white);border-bottom-color:var(--red)}

.footer-contact-block{
  padding:22px 0;
  border-top:1px solid var(--line);
}

.footer-contact-line{
  font-size:var(--fs-sm);
  letter-spacing:.02em;
  color:var(--ink);
  word-break:break-word;
}

.footer-service-note{
  margin-top:8px;
  font-size:var(--fs-xs);
  letter-spacing:.1em;
  color:var(--muted);
}

.footer-legal{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  padding:18px 0 40px;
  border-top:1px solid var(--line);
  font-size:var(--fs-xs);
  letter-spacing:.14em;
  color:var(--muted);
}
.footer-copy,.footer-icp{margin:0}

/* 7. 排版组件 ------------------------------------------------------------- */
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  margin-bottom:14px;
  font-family:var(--font-mono);
  font-size:var(--fs-xs);
  letter-spacing:.18em;
  color:var(--muted);
}
.eyebrow::before{content:"";width:26px;height:1px;background:var(--red)}

.display-xl,.display-lg,.display-md,.heading{
  font-weight:900;
  letter-spacing:-.02em;
  color:var(--white);
  line-height:1.08;
}
.display-xl{font-size:var(--fs-5xl)}
.display-lg{font-size:var(--fs-4xl)}
.display-md{font-size:var(--fs-3xl)}
.heading{font-size:var(--fs-2xl);font-weight:800;line-height:1.18;letter-spacing:-.015em}

.num{
  font-family:var(--font-mono);
  letter-spacing:.02em;
  font-variant-numeric:tabular-nums;
}

.prose{
  max-width:68ch;
  font-size:var(--fs-md);
  line-height:1.85;
  color:#DBE2EC;
}
.prose p{margin-bottom:1.05em}
.prose h2{
  margin:1.6em 0 .6em;
  font-size:var(--fs-2xl);
  font-weight:800;
  letter-spacing:-.015em;
  color:var(--white);
  line-height:1.2;
}
.prose h3{
  margin:1.4em 0 .5em;
  font-size:var(--fs-lg);
  font-weight:700;
  color:var(--white);
}
.prose ul,.prose ol{
  margin:0 0 1.05em;
  padding-left:1.3em;
  list-style:disc;
}
.prose ol{list-style:decimal}
.prose li{margin-bottom:.4em}
.prose strong{color:var(--white);font-weight:700}

/* 8. 通用组件 ------------------------------------------------------------- */
.panel{
  position:relative;
  padding:clamp(20px,2.6vw,28px);
  background:linear-gradient(180deg,var(--panel-hi),var(--panel));
  border:1px solid var(--line);
  clip-path:var(--clip-cut);
}
.panel--flat{background:var(--panel)}
.panel--accent{border-top:3px solid var(--red)}

.card{
  position:relative;
  display:flex;
  flex-direction:column;
  gap:14px;
  padding:clamp(18px,2.2vw,24px);
  background:linear-gradient(180deg,var(--panel-hi),var(--panel));
  border:1px solid var(--line);
  clip-path:var(--clip-cut);
  transition:transform var(--ease),box-shadow var(--ease),border-color var(--ease);
}
.card:hover{
  transform:translateY(-3px);
  box-shadow:0 20px 44px rgba(0,0,0,.5);
  border-color:var(--line-hi);
}
.card:focus-within{border-color:var(--focus)}

.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:3px 10px;
  font-family:var(--font-mono);
  font-size:var(--fs-xs);
  letter-spacing:.14em;
  color:var(--muted);
  border:1px solid var(--line);
}
.tag--live{color:var(--green);border-color:rgba(53,227,154,.42)}
.tag--next{color:var(--amber);border-color:rgba(255,176,32,.42)}
.tag--data{color:var(--blue);border-color:rgba(47,155,255,.42)}

.stat-grid{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(148px,1fr));
  gap:1px;
  background:var(--line);
  border:1px solid var(--line);
}
.stat{
  padding:18px 20px;
  background:var(--panel);
}
.stat-value{
  display:block;
  font-family:var(--font-mono);
  font-size:var(--fs-xl);
  line-height:1.2;
  letter-spacing:.02em;
  color:var(--white);
}
.stat-label{
  display:block;
  margin-top:6px;
  font-size:var(--fs-xs);
  letter-spacing:.16em;
  color:var(--muted);
}

.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  padding:13px 22px;
  font-size:var(--fs-sm);
  font-weight:700;
  letter-spacing:.04em;
  color:var(--ink);
  background:var(--panel);
  border:1px solid var(--line);
  clip-path:var(--clip-cut-sm);
  cursor:pointer;
  transition:background var(--ease),color var(--ease),transform var(--ease),border-color var(--ease);
}
.btn:hover{transform:translateY(-2px);color:var(--white);border-color:var(--line-hi)}
.btn--primary{background:var(--red);border-color:var(--red);color:var(--white)}
.btn--primary:hover{background:var(--red-deep);border-color:var(--red-deep);color:var(--white)}
.btn--ghost{background:transparent;border-color:var(--blue);color:var(--blue)}
.btn--ghost:hover{background:rgba(47,155,255,.14);color:var(--focus);border-color:var(--focus)}

.breadcrumbs{
  padding:18px 0 6px;
  font-size:var(--fs-xs);
  letter-spacing:.14em;
  color:var(--muted);
}
.breadcrumbs ol{display:flex;flex-wrap:wrap;gap:10px}
.breadcrumbs li{display:flex;align-items:center;gap:10px}
.breadcrumbs li + li::before{content:"/";color:var(--line-hi)}
.breadcrumbs a{color:var(--muted)}
.breadcrumbs a:hover{color:var(--blue)}
.breadcrumbs [aria-current="page"]{color:var(--ink)}

.rule-stripe{
  height:6px;
  background:repeating-linear-gradient(90deg,var(--red) 0 18px,transparent 18px 36px);
}

.track{
  position:relative;
  height:1px;
  background:var(--line);
}
.track::after{
  content:"";
  position:absolute;
  right:0;top:-3px;
  width:64px;height:7px;
  background:linear-gradient(90deg,transparent,var(--blue));
}

.pitch-grid{position:relative;isolation:isolate}
.pitch-grid::before{
  content:"";
  position:absolute;
  inset:0;
  z-index:-1;
  pointer-events:none;
  background-image:
    linear-gradient(rgba(152,162,179,.065) 1px,transparent 1px),
    linear-gradient(90deg,rgba(152,162,179,.065) 1px,transparent 1px);
  background-size:52px 52px;
  -webkit-mask-image:linear-gradient(180deg,#000,transparent 88%);
  mask-image:linear-gradient(180deg,#000,transparent 88%);
}

/* 9. 图片容器基础规则 ----------------------------------------------------- */
.media{
  position:relative;
  overflow:hidden;
  background:var(--panel);
  border:1px solid var(--line);
  clip-path:var(--clip-cut);
}
.media > img,
.media > svg,
.media > picture > img{
  display:block;
  width:100%;
  height:100%;
  object-fit:cover;
}
.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--21x9{aspect-ratio:21/9}

.media figcaption{
  position:absolute;
  left:0;right:0;bottom:0;
  padding:12px 16px;
  font-family:var(--font-mono);
  font-size:var(--fs-xs);
  letter-spacing:.14em;
  color:var(--ink);
  background:linear-gradient(0deg,rgba(10,12,16,.94),rgba(10,12,16,0));
}

/* 10. 显现协议 ------------------------------------------------------------ */
[data-reveal="pending"]{
  opacity:0;
  transform:translateY(14px);
  transition:opacity 520ms ease,transform 520ms cubic-bezier(.4,0,.2,1);
}
[data-reveal="shown"]{
  opacity:1;
  transform:none;
}

/* 11. 响应式 -------------------------------------------------------------- */
@media (max-width:1000px){
  .col-3,.col-4,.col-5{grid-column:span 6}
  .col-7,.col-8,.col-9{grid-column:span 12}
  .footer-main{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-brand{grid-column:1 / -1}
}

@media (max-width:880px){
  .masthead{
    grid-template-columns:1fr;
    gap:12px;
    padding:16px 0 14px;
    text-align:center;
  }
  .masthead-brand{order:1}
  .masthead-side{order:2;justify-content:center;gap:16px}
  .masthead-side--right{order:3;justify-content:center}

  .nav-inner{
    justify-content:space-between;
    min-height:52px;
  }
  .nav-toggle{display:inline-flex}

  .nav-list{
    position:absolute;
    top:100%;left:0;right:0;
    display:none;
    flex-direction:column;
    align-items:stretch;
    gap:0;
    padding:6px 0 10px;
    background:#101319;
    border-bottom:1px solid var(--line);
    box-shadow:0 26px 50px rgba(0,0,0,.6);
  }
  .masthead-nav[data-open] .nav-list{display:flex}

  .nav-link{
    padding:15px 22px;
    font-size:var(--fs-md);
  }
  .nav-link::after{left:22px;right:22px;bottom:8px}
}

@media (max-width:640px){
  .grid-12{grid-template-columns:repeat(6,minmax(0,1fr))}
  .col-3,.col-4,.col-5,.col-6,.col-7,.col-8,.col-9,.col-12{grid-column:span 6}

  .footer-main{
    grid-template-columns:1fr;
    gap:28px;
    padding:36px 0 26px;
  }
  .footer-legal{flex-direction:column;align-items:flex-start}

  .stat-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}

@media (max-width:420px){
  .brand-text{font-size:26px}
  .brand-tagline{letter-spacing:.14em}
  .masthead-side{gap:12px;font-size:11px;letter-spacing:.12em}
  .stat-grid{grid-template-columns:1fr}
}

/* 12. 减弱动效 ------------------------------------------------------------ */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .card:hover,.btn:hover{transform:none}
  .scroll-progress [data-progress-bar]{transition:none}
  [data-reveal="pending"]{opacity:1;transform:none}
}