/* ============================================================
   乐球中心 · 共享站点样式 /assets/site.css
   01 tokens · 02 reset · 03 typography · 04 layout
   05 components · 06 status bar · 07 header rail
   08 footer · 09 responsive · 10 motion
   ============================================================ */

/* ---------- 01 tokens ---------- */
:root{
  --c-blue:#0E5A7A;
  --c-deep:#083B52;
  --c-mist:#DCEEF5;
  --c-orange:#E4552B;
  --c-orange-deep:#B33A16;
  --c-gold:#D8A64B;
  --c-snow:#FBFCFD;
  --c-ink:#14181B;
  --c-gray:#6B7680;
  --c-line:#9FBFCC;

  --rail:236px;
  --topbar:40px;
  --maxw:1240px;

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

  --hair:1px solid rgba(159,191,204,.65);
  --slant:-8deg;
}

/* ---------- 02 reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,p,ul,ol,dl,dd,figure,blockquote,fieldset{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video{max-width:100%}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
a{color:var(--c-blue);text-decoration:none}
a:hover{color:var(--c-orange-deep)}
:focus-visible{outline:2px solid var(--c-orange);outline-offset:3px}
:target{scroll-margin-top:calc(var(--topbar) + 24px)}
main{display:block}

/* ---------- 03 typography ---------- */
body{
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.75;
  color:var(--c-ink);
  background:var(--c-snow);
  padding-top:var(--topbar);
  padding-left:var(--rail);
  min-height:100vh;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
@media (min-width:1280px){ body{font-size:17px} }

h1,h2,h3{line-height:1.28;font-weight:700}
h1{font-family:var(--font-display);font-size:clamp(38px,5.2vw,68px);letter-spacing:.02em}
h2{font-size:clamp(26px,3vw,38px);letter-spacing:.04em}
h3{font-size:clamp(19px,1.8vw,24px);letter-spacing:.04em}
p{margin:0}
strong{font-weight:700}

.mono{font-family:var(--font-mono);letter-spacing:.06em;font-variant-numeric:tabular-nums}
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.18em;
  color:var(--c-gray);text-transform:uppercase;
}
.eyebrow::before{content:"";width:22px;height:2px;background:var(--c-gold);flex:0 0 auto}
.lede{
  font-size:clamp(16px,1.5vw,18px);line-height:1.85;
  color:var(--c-gray);max-width:58ch;
}
.lede strong{color:var(--c-ink)}
.rule{display:block;width:44px;height:2px;background:var(--c-gold);border:0}

/* ---------- 04 layout ---------- */
.container{
  width:100%;max-width:var(--maxw);margin-inline:auto;
  padding-inline:clamp(20px,4vw,48px);
}
.section{padding-block:clamp(48px,7vw,96px)}
.section--tight{padding-block:clamp(32px,4vw,56px)}
.band{background:var(--c-mist);border-block:var(--hair)}
.band--deep{background:var(--c-deep);color:var(--c-snow);border-block:0}
.band--deep a{color:var(--c-gold)}
.band--deep a:hover{color:var(--c-snow)}

.grid{
  display:grid;grid-template-columns:repeat(12,minmax(0,1fr));
  gap:clamp(20px,3vw,40px);
}
.span-4{grid-column:span 4}
.span-5{grid-column:span 5}
.span-7{grid-column:span 7}
.span-8{grid-column:span 8}
.span-12{grid-column:span 12}

/* ---------- 05 components ---------- */
.skip-link{
  position:fixed;top:-120px;left:16px;z-index:200;
  padding:12px 20px;background:var(--c-deep);color:var(--c-snow);
  font-size:14px;letter-spacing:.06em;border:1px solid var(--c-gold);
  transition:top .16s linear;
}
.skip-link:focus{top:12px;color:var(--c-snow)}

.btn{
  display:inline-flex;align-items:center;gap:10px;
  padding:13px 24px;border:1px solid transparent;
  font-family:var(--font-sans);font-weight:700;font-size:14px;letter-spacing:.08em;
  text-decoration:none;cursor:pointer;
  transition:background-color .16s linear,color .16s linear,border-color .16s linear;
}
.btn--primary{background:var(--c-blue);border-color:var(--c-blue);color:var(--c-snow)}
.btn--primary:hover{background:var(--c-deep);border-color:var(--c-deep);color:var(--c-snow)}
.btn--ghost{background:transparent;border-color:var(--c-line);color:var(--c-ink)}
.btn--ghost:hover{border-color:var(--c-orange);color:var(--c-orange-deep)}
.btn--accent{background:var(--c-orange);border-color:var(--c-orange);color:#fff}
.btn--accent:hover{background:var(--c-orange-deep);border-color:var(--c-orange-deep);color:#fff}

.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:3px 10px;border:1px solid var(--c-line);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;
  color:var(--c-deep);background:transparent;text-decoration:none;
  transition:color .16s linear,border-color .16s linear,background-color .16s linear;
}
.tag:hover{border-color:var(--c-orange-deep);color:var(--c-orange-deep)}
.tag--accent{border-color:var(--c-orange);color:var(--c-orange-deep)}
.tag--solid{background:var(--c-blue);border-color:var(--c-blue);color:var(--c-snow)}
.tag--solid:hover{background:var(--c-deep);border-color:var(--c-deep);color:var(--c-snow)}

.sec-head{
  display:flex;align-items:baseline;flex-wrap:wrap;gap:14px;
  padding-bottom:14px;margin-bottom:clamp(24px,3vw,40px);
  border-bottom:var(--hair);
}
.sec-num{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:13px;letter-spacing:.14em;
  color:var(--c-gold);
}
.sec-num::after{content:"";width:26px;height:2px;background:var(--c-gold)}
.sec-title{font-size:clamp(22px,2.4vw,32px);letter-spacing:.06em;line-height:1.3}

.breadcrumb{padding-top:clamp(18px,2.5vw,28px)}
.breadcrumb__list{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--c-gray);
}
.breadcrumb__list li{display:flex;align-items:center;gap:8px}
.breadcrumb__list li + li::before{content:"/";color:var(--c-line)}
.breadcrumb__link{color:var(--c-gray);border-bottom:1px solid transparent}
.breadcrumb__link:hover{color:var(--c-orange-deep);border-bottom-color:currentColor}
.breadcrumb__current{color:var(--c-ink)}

.media{
  position:relative;display:block;overflow:hidden;
  background:var(--c-mist);border:var(--hair);
}
.media > img,.media > svg{display:block;width:100%;height:100%;object-fit:cover}
.media--wide{aspect-ratio:16/9}
.media--panel{aspect-ratio:4/3}
.media--tall{aspect-ratio:3/4}
.media--square{aspect-ratio:1/1}
.media--slant{clip-path:polygon(0 5%,100% 0,100% 100%,0 100%)}
.media__caption{
  margin-top:10px;font-family:var(--font-mono);font-size:11px;
  letter-spacing:.08em;line-height:1.7;color:var(--c-gray);
}
.media-stack{display:grid;gap:clamp(16px,2vw,28px)}

.anchor-index{
  position:sticky;top:calc(var(--topbar) + 28px);
  display:flex;flex-direction:column;gap:6px;
  padding-left:14px;border-left:1px solid var(--c-line);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;
}
.anchor-index__link{
  display:block;padding:3px 0;color:var(--c-gray);
  border-bottom:1px solid transparent;
}
.anchor-index__link:hover{color:var(--c-orange-deep)}
.anchor-index__link[aria-current="true"]{color:var(--c-orange-deep);border-bottom-color:var(--c-gold)}

/* ---------- 06 status bar ---------- */
.status-bar{
  position:fixed;top:0;left:0;width:100%;z-index:80;
  background:var(--c-deep);color:var(--c-snow);
  border-bottom:1px solid rgba(159,191,204,.35);
}
.status-bar__inner{
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  height:var(--topbar);max-width:1680px;margin-inline:auto;
  padding-inline:clamp(16px,3vw,32px);
}
.status-bar__state{
  display:flex;align-items:center;gap:10px;
  font-size:12px;letter-spacing:.1em;color:rgba(251,252,253,.88);
}
.status-bar__dot{
  width:7px;height:7px;flex:0 0 auto;display:block;
  background:var(--c-gold);transform:rotate(45deg);
}
.status-bar__cta{
  flex:0 0 auto;padding:4px 12px;font-size:12px;letter-spacing:.1em;
  color:var(--c-snow);border:1px solid rgba(251,252,253,.42);
  transition:background-color .16s linear,color .16s linear,border-color .16s linear;
}
.status-bar__cta:hover{background:var(--c-orange);border-color:var(--c-orange);color:#fff}
.status-bar__progress{
  position:absolute;left:0;bottom:0;height:2px;width:0;
  background:var(--c-gold);
}

/* ---------- 07 header rail ---------- */
.site-header{
  position:fixed;top:var(--topbar);left:0;bottom:0;width:var(--rail);z-index:70;
  display:flex;flex-direction:column;gap:18px;
  padding:clamp(20px,2vw,30px) 18px 18px;
  background:var(--c-snow);
  border-right:1px solid var(--c-line);
  overflow:hidden;
}
.masthead{
  flex:0 0 auto;display:flex;flex-direction:column;gap:16px;
  padding-bottom:18px;border-bottom:1px solid var(--c-line);
}
.brand{
  display:flex;flex-direction:column;align-items:flex-start;gap:12px;
  color:var(--c-ink);text-decoration:none;
}
.brand:hover{color:var(--c-ink)}
.brand__mark{
  position:relative;width:46px;height:46px;flex:0 0 auto;
  display:grid;place-items:center;
  background:var(--c-blue);color:var(--c-snow);
  font-family:var(--font-display);font-weight:700;font-size:22px;line-height:1;
  transition:background-color .16s linear;
}
.brand:hover .brand__mark{background:var(--c-deep)}
.brand__mark::after{
  content:"";position:absolute;right:-4px;bottom:-4px;
  width:14px;height:14px;
  border-right:2px solid var(--c-gold);border-bottom:2px solid var(--c-gold);
}
.brand__text{display:flex;flex-direction:column;gap:6px;min-width:0}
.brand__name{
  font-family:var(--font-display);font-weight:700;font-size:20px;
  letter-spacing:.08em;line-height:1.2;color:var(--c-ink);
}
.brand__tagline{
  font-size:12px;line-height:1.65;letter-spacing:.01em;
  color:var(--c-gray);max-width:17ch;
}
.nav-toggle{
  display:none;align-items:center;gap:10px;
  padding:8px 14px;border:1px solid var(--c-line);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.12em;
  color:var(--c-deep);
  transition:border-color .16s linear,color .16s linear;
}
.nav-toggle:hover{border-color:var(--c-orange);color:var(--c-orange-deep)}
.nav-toggle__label{line-height:1}
.nav-toggle__bars{position:relative;display:block;width:18px;height:12px;flex:0 0 auto}
.nav-toggle__bars::before,.nav-toggle__bars::after{
  content:"";position:absolute;left:0;width:18px;height:1.5px;
  background:currentColor;
  transition:transform .18s linear;
}
.nav-toggle__bars::before{top:0}
.nav-toggle__bars::after{bottom:0}
.site-header[data-open] .nav-toggle__bars::before{transform:translateY(5px) rotate(45deg)}
.site-header[data-open] .nav-toggle__bars::after{transform:translateY(-5px) rotate(-45deg)}

.site-nav{
  flex:1 1 auto;min-height:0;overflow-y:auto;overscroll-behavior:contain;
  display:flex;flex-direction:column;
}
.site-nav__list{display:flex;flex-direction:column}
.site-nav__item{border-bottom:1px solid rgba(159,191,204,.55)}
.site-nav__item:first-child{border-top:1px solid rgba(159,191,204,.55)}
.site-nav__link{
  position:relative;display:flex;align-items:baseline;gap:10px;
  padding:11px 4px;font-size:15px;letter-spacing:.04em;color:var(--c-ink);
  transition:color .16s linear,padding-left .16s linear,box-shadow .16s linear;
}
.site-nav__link::after{
  content:"";position:absolute;left:0;right:0;bottom:-1px;height:1px;
  background:var(--c-orange-deep);transform:scaleX(0);transform-origin:left center;
  transition:transform .2s ease;
}
.site-nav__link:hover{color:var(--c-orange-deep)}
.site-nav__link:hover::after{transform:scaleX(1)}
.site-nav__num{font-size:11px;letter-spacing:.1em;color:var(--c-gold)}
.site-nav__link:hover .site-nav__num{color:var(--c-orange-deep)}
.site-nav__link[aria-current="page"]{
  color:var(--c-blue);font-weight:700;padding-left:12px;
  box-shadow:inset 3px 0 0 var(--c-orange);
}
.site-nav__link[aria-current="page"] .site-nav__num{color:var(--c-orange-deep)}
.site-nav__aside{
  display:flex;flex-direction:column;gap:8px;
  margin-top:14px;padding-top:14px;border-top:1px solid var(--c-gold);
}
.site-nav__aside-link{
  align-self:flex-start;padding:4px 10px;
  font-size:12px;letter-spacing:.06em;color:var(--c-deep);
  border:1px solid var(--c-line);
  transition:color .16s linear,border-color .16s linear;
}
.site-nav__aside-link:hover{color:var(--c-orange-deep);border-color:var(--c-orange-deep)}

/* ---------- 08 footer ---------- */
.site-footer{
  margin-top:clamp(64px,9vw,120px);
  padding-top:clamp(40px,6vw,72px);
  background:var(--c-deep);color:rgba(251,252,253,.86);
  border-top:3px solid var(--c-gold);
}
.site-footer__inner{
  width:100%;max-width:var(--maxw);margin-inline:auto;
  padding-inline:clamp(20px,4vw,48px);
  display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;
  gap:clamp(28px,4vw,56px);
}
.site-footer__lead{display:flex;flex-direction:column;gap:16px;min-width:0}
.brand--invert{flex-direction:row;align-items:center;gap:12px;color:var(--c-snow)}
.brand--invert:hover{color:var(--c-snow)}
.brand--invert .brand__mark{width:42px;height:42px;font-size:20px;background:var(--c-blue)}
.brand--invert:hover .brand__mark{background:var(--c-orange)}
.brand--invert .brand__name{color:var(--c-snow);font-size:19px}
.site-footer__contact{display:flex;flex-direction:column;gap:8px;font-size:13px;line-height:1.65}
.site-footer__contact-item{display:flex;flex-wrap:wrap;gap:4px 10px}
.site-footer__contact-key{
  flex:0 0 auto;font-size:11px;letter-spacing:.14em;color:var(--c-gold);
}
.site-footer__contact-val{color:var(--c-snow);word-break:break-word;overflow-wrap:anywhere}
.site-footer__note{
  font-size:12px;line-height:1.75;color:rgba(251,252,253,.62);max-width:34ch;
}
.site-footer__mark{
  margin-top:auto;padding-top:12px;
  border-top:1px solid rgba(159,191,204,.32);
  font-size:11px;letter-spacing:.12em;color:var(--c-gold);
}
.footer-col{display:flex;flex-direction:column;gap:14px;min-width:0}
.footer-col__title{
  font-size:13px;font-weight:700;letter-spacing:.16em;color:var(--c-snow);
  padding-bottom:12px;border-bottom:1px solid rgba(159,191,204,.32);
}
.footer-col__list{display:flex;flex-direction:column;gap:10px}
.footer-link{
  position:relative;display:inline-block;
  font-size:14px;line-height:1.6;color:rgba(251,252,253,.78);
  transition:color .16s linear;
}
.footer-link::after{
  content:"";position:absolute;left:0;bottom:-2px;width:100%;height:1px;
  background:var(--c-gold);transform:scaleX(0);transform-origin:left center;
  transition:transform .2s ease;
}
.footer-link:hover{color:var(--c-snow)}
.footer-link:hover::after{transform:scaleX(1)}
.site-footer__base{
  width:100%;max-width:var(--maxw);margin:clamp(36px,5vw,64px) auto 0;
  padding:18px clamp(20px,4vw,48px) 26px;
  border-top:1px solid rgba(159,191,204,.26);
  display:flex;flex-wrap:wrap;gap:8px 24px;
  font-size:11px;letter-spacing:.1em;color:rgba(251,252,253,.6);
}
.site-footer__base-item{display:inline-flex;align-items:center;gap:6px}
.site-footer__base .footer-link{font-size:11px;color:rgba(251,252,253,.6)}
.site-footer__base .footer-link:hover{color:var(--c-snow)}

/* ---------- 09 responsive ---------- */
@media (max-width:1079px){
  body{padding-top:0;padding-left:0}

  .status-bar{position:static;border-bottom:1px solid rgba(159,191,204,.35)}
  .status-bar__inner{height:auto;min-height:36px;padding-block:6px;flex-wrap:wrap;row-gap:2px}
  .status-bar__state{font-size:11px;letter-spacing:.08em}
  .status-bar__cta{font-size:11px;padding:2px 10px}
  .status-bar__progress{display:none}

  .site-header{
    position:static;width:auto;top:auto;bottom:auto;
    padding:0;gap:0;overflow:visible;
    border-right:0;border-bottom:1px solid var(--c-line);
  }
  .masthead{
    flex-direction:row;align-items:center;justify-content:space-between;
    gap:14px;padding:12px clamp(16px,4vw,24px);border-bottom:0;
  }
  .brand{flex-direction:row;align-items:center;gap:12px}
  .brand__mark{width:40px;height:40px;font-size:19px}
  .brand__name{font-size:18px}
  .brand__tagline{display:none}
  .nav-toggle{display:inline-flex}

  .site-nav{
    display:none;flex:none;overflow:visible;
    padding:0 clamp(16px,4vw,24px) 16px;
    border-top:1px solid var(--c-line);
  }
  .site-header[data-open] .site-nav{display:flex}
  .site-nav__list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));column-gap:18px}
  .site-nav__item:first-child{border-top:0}
  .site-nav__link{padding:11px 2px;font-size:15px}
  .site-nav__link[aria-current="page"]{padding-left:10px}
  .site-nav__aside{margin-top:12px;padding-top:12px}

  .site-footer__inner{grid-template-columns:1fr 1fr}
  .site-footer__lead{grid-column:1 / -1}
  .anchor-index{display:none}

  .grid{gap:20px}
  .span-4,.span-5,.span-7,.span-8{grid-column:span 12}
}

@media (max-width:719px){
  .site-nav__list{grid-template-columns:1fr}
  .site-footer__inner{grid-template-columns:1fr}
  .site-footer__note{max-width:none}
  .status-bar__state{flex:1 1 100%}
  .breadcrumb__list{font-size:11px}
  .btn{padding:12px 18px;font-size:13px}
}

/* ---------- 10 motion ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  .skip-link{transition:none}
}