/* =========================================================
   买球看台 · shared site.css
   夜场深蓝 / 荧光绿 / 哨声橙红 · 技术蓝图看台
   ========================================================= */

:root{
  --navy:#0B1B33;
  --navy-2:#12294A;
  --ink:#050C18;
  --lime:#C8FF4D;
  --orange:#FF5A2B;
  --amber:#FFC63D;
  --cream:#F4EFE4;
  --mist:#8FA3BF;
  --white:#E8EDF5;
  --paper-ink:#1C1610;

  --line:rgba(143,163,191,.22);
  --line-soft:rgba(143,163,191,.14);
  --glass:rgba(18,41,74,.55);

  --shell:1240px;
  --step:8px;

  --font-sans:"Inter","PingFang SC","Hiragino Sans GB","Source Han Sans SC","Noto Sans SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-cond:"Archivo Narrow","Oswald","PingFang SC","Source Han Sans SC","Noto Sans SC",system-ui,sans-serif;
  --font-mono:ui-monospace,"SFMono-Regular","JetBrains Mono","Roboto Mono",Menlo,Consolas,"Courier New",monospace;
}

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box;}
html{margin:0;padding:0;-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{margin:0;padding:0;}
img,svg,video{display:block;max-width:100%;height:auto;}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer;}
a{color:inherit;text-decoration:none;}
ul,ol{margin:0;padding:0;list-style:none;}
h1,h2,h3,h4,p{margin:0;}
table{border-collapse:collapse;width:100%;}
:focus-visible{outline:2px solid var(--lime);outline-offset:3px;border-radius:2px;}
::selection{background:var(--lime);color:var(--ink);}

/* ---------- base ---------- */
body{
  background-color:var(--navy);
  background-image:
    linear-gradient(rgba(143,163,191,.065) 1px,transparent 1px),
    linear-gradient(90deg,rgba(143,163,191,.065) 1px,transparent 1px);
  background-size:64px 64px,64px 64px;
  background-position:0 0,0 0;
  color:var(--white);
  font-family:var(--font-sans);
  font-size:17px;
  line-height:1.75;
  letter-spacing:.01em;
  min-height:100vh;
  overflow-x:hidden;
}
body.nav-open{overflow:hidden;}

h1,h2,h3,h4{font-family:var(--font-cond);font-weight:800;letter-spacing:-.02em;line-height:1.14;}
h1{font-size:clamp(40px,6.4vw,76px);}
h2{font-size:clamp(24px,3.2vw,34px);}
h3{font-size:clamp(19px,2.2vw,24px);}
strong{font-weight:700;color:var(--lime);}
.num,.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.02em;}

.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0;}

.shell{width:100%;max-width:var(--shell);margin:0 auto;padding-inline:clamp(16px,4vw,40px);}

.section{padding-block:clamp(48px,7vw,104px);}
.section--tight{padding-block:clamp(32px,4.5vw,64px);}
.section--paper{
  background:var(--cream);
  color:var(--paper-ink);
  border-block:1px solid rgba(28,22,16,.14);
}
.section--paper .lede,
.section--paper .muted{color:rgba(28,22,16,.72);}
.section--band{
  background:linear-gradient(180deg,rgba(18,41,74,.92),rgba(11,27,51,.92));
  border-block:1px solid var(--line);
}

.eyebrow{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--lime);
}
.lede{font-size:clamp(17px,1.6vw,20px);color:var(--white);line-height:1.7;}
.muted{color:var(--mist);}
.prose{max-width:42em;}
.prose p{margin-bottom:1.1em;}
.prose p:last-child{margin-bottom:0;}
.prose a{color:var(--lime);border-bottom:1px solid rgba(200,255,77,.45);}

/* ---------- skip link ---------- */
.skip-link{
  position:fixed;
  left:12px;
  top:-80px;
  z-index:120;
  background:var(--lime);
  color:var(--ink);
  font-weight:700;
  font-size:14px;
  padding:10px 18px;
  border-radius:2px;
  transition:top .2s ease;
}
.skip-link:focus{top:12px;}

/* ---------- grid helpers ---------- */
.grid{display:grid;gap:clamp(16px,2.4vw,32px);}
.grid--12{grid-template-columns:repeat(12,minmax(0,1fr));}
.span-4{grid-column:span 4;}
.span-5{grid-column:span 5;}
.span-6{grid-column:span 6;}
.span-7{grid-column:span 7;}
.span-8{grid-column:span 8;}
.span-12{grid-column:span 12;}
@media (max-width:900px){
  .grid--12{grid-template-columns:1fr;}
  .span-4,.span-5,.span-6,.span-7,.span-8,.span-12{grid-column:1 / -1;}
}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  font-family:var(--font-cond);
  font-size:15px;
  font-weight:800;
  letter-spacing:.03em;
  padding:12px 22px;
  border-radius:2px;
  border:1px solid transparent;
  transition:background-color .2s ease,color .2s ease,border-color .2s ease,transform .18s ease;
}
.btn:hover{transform:translateY(-1px);}
.btn:active{transform:none;}
.btn--primary{background:var(--orange);color:#fff;box-shadow:inset 0 -2px 0 rgba(5,12,24,.28);}
.btn--primary:hover{background:#ff7048;}
.btn--ghost{border-color:rgba(200,255,77,.5);color:var(--lime);}
.btn--ghost:hover{background:rgba(200,255,77,.12);}

/* ---------- tags & filter ---------- */
.tag-group{display:flex;flex-wrap:wrap;gap:8px;}
.tag{
  font-family:var(--font-mono);
  font-size:12.5px;
  letter-spacing:.04em;
  padding:6px 13px;
  border:1px solid rgba(143,163,191,.35);
  border-radius:999px;
  color:var(--mist);
  background:transparent;
  transition:color .2s ease,border-color .2s ease,background-color .2s ease;
}
.tag:hover{color:var(--white);border-color:rgba(200,255,77,.55);}
.tag.is-active,
.tag[aria-pressed="true"]{
  background:var(--amber);
  border-color:var(--amber);
  color:var(--ink);
  font-weight:700;
}
[data-filter-item][hidden]{display:none;}

/* ---------- cards ---------- */
.card{
  background:var(--navy-2);
  border:1px solid var(--line);
  border-radius:4px;
  padding:clamp(18px,2.4vw,28px);
}
.card--glass{
  background:var(--glass);
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
  border-color:rgba(200,255,77,.2);
}
.card--solid{background:var(--navy-2);border-color:var(--line);}
.card--paper{
  background:var(--cream);
  color:var(--paper-ink);
  border-color:rgba(28,22,16,.16);
}
.card--paper .card__title,
.card--paper h3,
.card--paper h2{color:var(--paper-ink);}
.card__title{font-size:clamp(18px,1.9vw,22px);color:var(--white);}
.card__meta{font-family:var(--font-mono);font-size:12px;letter-spacing:.14em;color:var(--mist);}

/* ---------- stats ---------- */
.stat{border-left:2px solid var(--lime);padding-left:16px;}
.stat__value{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  font-size:clamp(38px,6vw,64px);
  line-height:1;
  font-weight:700;
  color:var(--white);
  letter-spacing:-.02em;
}
.stat__label{
  margin-top:10px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.16em;
  color:var(--mist);
}
.section--paper .stat__value{color:var(--paper-ink);}
.section--paper .stat__label{color:rgba(28,22,16,.6);}
.section--paper .stat{border-left-color:var(--orange);}

/* ---------- media frame ---------- */
.media-frame{
  position:relative;
  overflow:hidden;
  border-radius:4px;
  border:1px solid var(--line);
  background:linear-gradient(140deg,var(--navy-2),var(--ink));
  aspect-ratio:16 / 10;
}
.media-frame img{width:100%;height:100%;object-fit:cover;}
.media-frame--wide{aspect-ratio:21 / 9;}
.media-frame--tall{aspect-ratio:4 / 5;}
.media-frame--square{aspect-ratio:1 / 1;}
.media-frame__tag{
  position:absolute;
  left:12px;
  bottom:12px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  padding:5px 10px;
  background:rgba(5,12,24,.74);
  color:var(--lime);
  border:1px solid rgba(200,255,77,.35);
  border-radius:2px;
  backdrop-filter:blur(6px);
  -webkit-backdrop-filter:blur(6px);
}

/* ---------- breadcrumb ---------- */
.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  gap:6px;
  padding-block:16px;
  font-family:var(--font-mono);
  font-size:12.5px;
  letter-spacing:.06em;
  color:var(--mist);
}
.breadcrumb li{display:inline-flex;align-items:center;gap:6px;}
.breadcrumb li+li::before{content:"/";color:rgba(143,163,191,.5);}
.breadcrumb a{color:var(--mist);border-bottom:1px solid transparent;transition:color .2s ease,border-color .2s ease;}
.breadcrumb a:hover{color:var(--lime);border-bottom-color:rgba(200,255,77,.5);}

/* =========================================================
   HEADER
   ========================================================= */
.site-header{
  position:sticky;
  top:0;
  z-index:80;
  background:var(--ink);
  border-bottom:1px solid var(--line);
}

.brand-strip{
  background:var(--ink);
  border-bottom:1px solid var(--line-soft);
  transition:opacity .25s ease;
}
.brand-strip__inner{
  display:flex;
  align-items:center;
  flex-wrap:wrap;
  gap:10px clamp(14px,2.2vw,28px);
  min-height:56px;
  padding-block:8px;
}
.brand-strip__brand{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-family:var(--font-cond);
  font-weight:800;
  font-size:19px;
  letter-spacing:-.01em;
}
.brand-mark{
  width:14px;
  height:14px;
  flex:none;
  border-radius:2px;
  background:linear-gradient(135deg,var(--lime) 0 50%,var(--orange) 50% 100%);
  box-shadow:inset 0 0 0 1px rgba(232,237,245,.28);
}
.brand-name{color:var(--white);}
.brand-latin{
  font-family:var(--font-mono);
  font-size:10.5px;
  font-weight:400;
  letter-spacing:.3em;
  color:var(--mist);
}
.brand-strip__meta{
  display:flex;
  flex-wrap:wrap;
  gap:6px;
  margin-left:auto;
}
.meta-chip{
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.05em;
  white-space:nowrap;
  padding:3px 10px;
  border-radius:2px;
  color:var(--lime);
  border:1px solid rgba(200,255,77,.34);
  background:rgba(200,255,77,.07);
}
.meta-chip--muted{
  color:var(--mist);
  border-color:rgba(143,163,191,.3);
  background:transparent;
}
.brand-strip__contact{
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.04em;
  color:var(--mist);
}
@media (max-width:1080px){
  .brand-strip__meta{order:3;width:100%;margin-left:0;}
}

.nav-row{
  background:linear-gradient(180deg,rgba(18,41,74,.96),rgba(11,27,51,.96));
  border-bottom:1px solid var(--line);
  backdrop-filter:blur(8px);
  -webkit-backdrop-filter:blur(8px);
}
.nav-row__inner{
  display:flex;
  align-items:center;
  gap:18px;
  min-height:64px;
  transition:min-height .25s ease;
}
.site-header[data-scrolled] .nav-row__inner{min-height:52px;}
.site-header[data-scrolled] .brand-strip__inner{min-height:44px;padding-block:4px;}

.primary-nav{
  display:flex;
  align-items:center;
  margin-left:auto;
}
.primary-nav__list{
  display:flex;
  align-items:center;
  gap:clamp(6px,1.1vw,18px);
}
.primary-nav__list a{
  position:relative;
  display:inline-block;
  padding:10px 2px;
  font-size:15px;
  font-weight:600;
  color:var(--mist);
  transition:color .2s ease;
}
.primary-nav__list a::after{
  content:"";
  position:absolute;
  left:0;
  right:0;
  bottom:2px;
  height:2px;
  background:var(--lime);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .26s ease;
}
.primary-nav__list a:hover{color:var(--white);}
.primary-nav__list a:hover::after{transform:scaleX(1);}
.primary-nav__list a[aria-current="page"]{color:var(--lime);}
.primary-nav__list a[aria-current="page"]::after{transform:scaleX(1);}

.primary-nav__cta{display:none;}
.nav-row__cta{margin-left:6px;flex:none;}

.nav-toggle{
  display:none;
  align-items:center;
  gap:10px;
  padding:10px 14px;
  border:1px solid rgba(143,163,191,.38);
  border-radius:2px;
  font-family:var(--font-mono);
  font-size:13px;
  font-weight:700;
  letter-spacing:.14em;
  color:var(--white);
  background:rgba(5,12,24,.5);
}
.nav-toggle__bars{display:grid;gap:4px;width:18px;}
.nav-toggle__bars i{
  display:block;
  height:2px;
  background:var(--lime);
  transition:transform .25s ease,opacity .2s ease;
}
.site-header[data-open] .nav-toggle__bars i:nth-child(1){transform:translateY(6px) rotate(45deg);}
.site-header[data-open] .nav-toggle__bars i:nth-child(2){opacity:0;}
.site-header[data-open] .nav-toggle__bars i:nth-child(3){transform:translateY(-6px) rotate(-45deg);}

@media (max-width:900px){
  .nav-row__inner{justify-content:space-between;}
  .nav-toggle{display:inline-flex;}
  .nav-row__cta{display:none;}
  .primary-nav{
    position:fixed;
    top:0;
    right:0;
    bottom:0;
    width:min(86vw,340px);
    margin-left:0;
    display:flex;
    flex-direction:column;
    align-items:stretch;
    padding:92px 24px 32px;
    background:var(--ink);
    border-left:1px solid rgba(143,163,191,.28);
    transform:translateX(103%);
    transition:transform .32s ease;
    overflow-y:auto;
    z-index:90;
  }
  .primary-nav[data-open]{transform:none;}
  .site-header[data-open] .primary-nav{transform:none;}
  .primary-nav__list{
    flex-direction:column;
    align-items:stretch;
    gap:0;
  }
  .primary-nav__list a{
    display:block;
    padding:15px 4px;
    font-size:17px;
    border-bottom:1px solid var(--line-soft);
  }
  .primary-nav__list a::after{bottom:6px;right:auto;left:4px;width:22px;}
  .primary-nav__cta{display:inline-flex;margin-top:24px;}
  .site-header[data-open]::after{
    content:"";
    position:fixed;
    inset:0;
    background:rgba(5,12,24,.62);
    z-index:85;
  }
}

/* =========================================================
   FOOTER
   ========================================================= */
.site-footer{
  position:relative;
  background:var(--ink);
  color:var(--white);
  border-top:1px solid var(--line);
}
.site-footer::before{
  content:"";
  position:absolute;
  inset:0 0 auto 0;
  height:3px;
  background:linear-gradient(90deg,var(--lime),var(--amber) 46%,var(--orange));
}
.footer-grid{
  display:grid;
  grid-template-columns:1.6fr 1fr 1fr 1fr 1.5fr;
  gap:clamp(20px,3vw,44px);
  padding-block:clamp(40px,6vw,72px) clamp(32px,4vw,56px);
}
.footer-brand__name{
  font-family:var(--font-cond);
  font-size:26px;
  font-weight:800;
  letter-spacing:-.02em;
  color:var(--white);
}
.footer-brand__url{
  margin-top:2px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--lime);
  word-break:break-all;
}
.footer-brand__desc{
  margin-top:14px;
  max-width:34ch;
  font-size:14px;
  line-height:1.75;
  color:var(--mist);
}
.footer-brand__badge{
  display:inline-block;
  margin-top:16px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.05em;
  color:var(--amber);
  border:1px dashed rgba(255,198,61,.5);
  border-radius:2px;
  padding:4px 10px;
}
.footer-col__title{
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:700;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--mist);
}
.footer-col__list{display:grid;gap:10px;margin-top:16px;}
.footer-col__list a{
  font-size:15px;
  color:var(--white);
  border-bottom:1px solid transparent;
  transition:color .2s ease,border-color .2s ease;
}
.footer-col__list a:hover{color:var(--lime);border-bottom-color:rgba(200,255,77,.5);}

.contact-list{display:grid;gap:12px;margin-top:16px;}
.contact-list li{display:grid;gap:2px;}
.contact-k{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.18em;
  color:var(--mist);
}
.contact-v{font-size:14px;line-height:1.6;color:var(--white);word-break:break-all;}
.footer-contact__note{
  margin-top:16px;
  font-size:13px;
  line-height:1.7;
  color:var(--mist);
}

.footer-legal{
  border-top:1px solid var(--line-soft);
  background:rgba(5,12,24,.7);
}
.footer-legal__inner{
  display:flex;
  justify-content:space-between;
  align-items:center;
  flex-wrap:wrap;
  gap:10px;
  padding-block:18px;
  font-family:var(--font-mono);
  font-size:12px;
  line-height:1.7;
  color:var(--mist);
}

@media (max-width:1080px){
  .footer-grid{grid-template-columns:1fr 1fr 1fr;}
  .footer-brand{grid-column:1 / -1;}
  .footer-contact{grid-column:1 / -1;}
}
@media (max-width:620px){
  .footer-grid{grid-template-columns:1fr 1fr;}
  .footer-brand__desc{max-width:none;}
  .footer-legal__inner{flex-direction:column;align-items:flex-start;}
}

/* =========================================================
   RUNTIME UTILITIES (JS protocols)
   ========================================================= */
.site-progress{
  position:fixed;
  top:0;
  left:0;
  right:0;
  height:3px;
  z-index:100;
  pointer-events:none;
  background:rgba(143,163,191,.14);
}
.site-progress__bar{
  display:block;
  height:100%;
  width:0;
  background:linear-gradient(90deg,var(--lime),var(--amber));
}

html.js [data-reveal]{
  opacity:0;
  transform:translateY(16px);
  transition:opacity .55s ease,transform .55s cubic-bezier(.22,.7,.3,1);
}
html.js [data-reveal].is-revealed{opacity:1;transform:none;}

[data-toc-link].is-current{color:var(--lime);}

/* =========================================================
   ACCESSIBILITY
   ========================================================= */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  html.js [data-reveal]{opacity:1;transform:none;}
  .btn:hover{transform:none;}
  .primary-nav{transition:none;}
}