/* ============================================================
   九游体育 iOS — 共享站点样式 /assets/site.css
   01 设计令牌 / 02 重置 / 03 排版 / 04 布局 / 05 组件
   06 头部 / 07 页脚 / 08 工具类 / 09 动效与无障碍
   ============================================================ */

/* ---------- 01 设计令牌 ---------- */
:root{
  --ink-900:#06231C;
  --ink-850:#041A15;
  --ink-800:#0A322A;
  --ink-700:#114238;
  --line:#1C4A40;
  --neon:#3BF0C8;
  --neon-deep:#17A98B;
  --signal:#FF7A33;
  --cool:#E6F2EE;
  --muted:#8FA9A1;
  --white:#F4FBF8;

  --font-display:"Helvetica Neue","Arial Narrow","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-body:system-ui,-apple-system,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC",sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Courier New",monospace;

  --maxw:1320px;
  --gutter:clamp(16px,4vw,40px);
  --gap:clamp(14px,1.6vw,24px);
  --header-h:78px;
  --header-h-sm:56px;
  --dur:200ms;
  --ease:linear;
}

/* ---------- 02 重置 ---------- */
*,*::before,*::after{box-sizing:border-box}

html{
  -webkit-text-size-adjust:100%;
  background-color:var(--ink-900);
}
@media (prefers-reduced-motion:no-preference){
  html{scroll-behavior:smooth}
}

body{
  margin:0;
  background-color:var(--ink-900);
  color:var(--cool);
  font-family:var(--font-body);
  font-size:16px;
  font-weight:400;
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  overflow-x:hidden;
}

h1,h2,h3,h4,h5,h6,p,ul,ol,li,figure,blockquote,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video,canvas{display:block;max-width:100%}
a{color:inherit;text-decoration:none;transition:color var(--dur) var(--ease)}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:0;padding:0;cursor:pointer}
table{border-collapse:collapse;width:100%}
hr{border:0;height:1px;background:var(--line);margin:0}
::selection{background:var(--neon);color:#04211B}

:focus-visible{
  outline:2px solid var(--neon);
  outline-offset:3px;
}

/* ---------- 03 排版 ---------- */
.display{
  font-family:var(--font-display);
  font-weight:700;
  font-size:clamp(34px,5.4vw,64px);
  line-height:1.04;
  letter-spacing:-0.02em;
  color:var(--white);
}
.h2{
  font-family:var(--font-display);
  font-weight:600;
  font-size:clamp(24px,3vw,36px);
  line-height:1.15;
  letter-spacing:-0.02em;
  color:var(--white);
}
.h3{
  font-family:var(--font-display);
  font-weight:600;
  font-size:clamp(18px,2vw,22px);
  line-height:1.3;
  letter-spacing:-0.01em;
  color:var(--white);
}
.lede{
  font-size:clamp(16px,1.5vw,18px);
  line-height:1.75;
  color:var(--cool);
  max-width:68ch;
}
.prose{
  max-width:68ch;
  font-size:16px;
  line-height:1.75;
  color:var(--cool);
}
.prose > * + *{margin-top:1em}
.prose h2,.prose h3{margin-top:1.6em;margin-bottom:.5em}
.prose ul,.prose ol{padding-left:1.3em}
.prose ul{list-style:disc}
.prose ol{list-style:decimal}
.prose li + li{margin-top:.4em}
.prose a{color:var(--neon);border-bottom:1px solid var(--neon-deep)}

.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:500;
  letter-spacing:.08em;
  text-transform:uppercase;
  color:var(--muted);
}
.eyebrow::before{
  content:"";
  width:18px;
  height:1px;
  background:var(--neon);
  flex:0 0 auto;
}

.muted{color:var(--muted)}
.num{
  font-family:var(--font-mono);
  font-weight:500;
  font-variant-numeric:tabular-nums;
  letter-spacing:0;
}
.num--neon{color:var(--neon)}
.num--signal{color:var(--signal)}

/* ---------- 04 布局 ---------- */
.container{
  width:100%;
  max-width:var(--maxw);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.section{padding-block:clamp(44px,6vw,88px)}
.section--line{border-top:1px solid var(--line)}
.section__head{
  display:flex;
  flex-wrap:wrap;
  align-items:flex-end;
  justify-content:space-between;
  gap:16px 32px;
  margin-bottom:clamp(22px,3vw,40px);
}
.grid{
  display:grid;
  grid-template-columns:repeat(12,minmax(0,1fr));
  gap:var(--gap);
}
.grid > *{grid-column:span 12;min-width:0}
.stack{display:flex;flex-direction:column;gap:var(--gap)}
.rule{height:1px;background:var(--line);border:0}

@media (min-width:640px){
  .span-4{grid-column:span 4}
  .span-6{grid-column:span 6}
  .span-8{grid-column:span 8}
}
@media (min-width:1024px){
  .span-3{grid-column:span 3}
  .span-5{grid-column:span 5}
  .span-7{grid-column:span 7}
  .span-9{grid-column:span 9}
}

/* ---------- 05 组件 ---------- */
.panel{
  position:relative;
  background-color:var(--ink-800);
  border:1px solid var(--line);
  padding:clamp(18px,2.4vw,28px);
}
.panel--raised{background-color:var(--ink-700)}
.panel--outline{background-color:transparent}
.panel--interactive{
  transition:background-color var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.panel--interactive:hover{
  background-color:var(--ink-700);
  border-color:var(--neon);
}

.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.5em;
  font-family:var(--font-display);
  font-size:14px;
  font-weight:600;
  letter-spacing:.02em;
  line-height:1;
  padding:13px 22px;
  border:1px solid var(--line);
  background-color:transparent;
  color:var(--white);
  cursor:pointer;
  white-space:nowrap;
  transition:background-color var(--dur) var(--ease),
             border-color var(--dur) var(--ease),
             color var(--dur) var(--ease);
}
.btn--primary{
  background-color:var(--neon);
  border-color:var(--neon);
  color:#04211B;
}
.btn--primary:hover{
  background-color:var(--white);
  border-color:var(--white);
  color:#04211B;
}
.btn--ghost{color:var(--cool)}
.btn--ghost:hover{
  border-color:var(--neon);
  color:var(--white);
  background-color:var(--ink-700);
}
.btn--sm{padding:9px 15px;font-size:13px}

.tag{
  display:inline-flex;
  align-items:center;
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:500;
  letter-spacing:.08em;
  text-transform:uppercase;
  padding:3px 8px;
  border:1px solid var(--line);
  color:var(--muted);
  white-space:nowrap;
}
.tag--neon{color:var(--neon);border-color:var(--neon-deep)}
.tag--signal{color:var(--signal);border-color:rgba(255,122,51,.5)}

.chip{
  display:inline-flex;
  align-items:center;
  gap:6px;
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:500;
  letter-spacing:.04em;
  padding:6px 11px;
  border:1px solid var(--line);
  background-color:transparent;
  color:var(--muted);
  cursor:pointer;
  transition:background-color var(--dur) var(--ease),
             border-color var(--dur) var(--ease),
             color var(--dur) var(--ease);
}
.chip:hover{color:var(--cool);border-color:var(--neon-deep)}
.chip[aria-pressed="true"],
.chip.is-active{
  background-color:var(--neon);
  border-color:var(--neon);
  color:#04211B;
}

.media{
  position:relative;
  display:block;
  overflow:hidden;
  background-color:var(--ink-800);
  border:1px solid var(--line);
  isolation:isolate;
}
.media::before{
  content:"";
  position:absolute;
  inset:0;
  z-index:0;
  background-image:
    linear-gradient(to right,var(--line) 1px,transparent 1px),
    linear-gradient(to bottom,var(--line) 1px,transparent 1px);
  background-size:44px 44px;
  opacity:.45;
  pointer-events:none;
}
.media > img,
.media > picture > img,
.media > video{
  position:relative;
  z-index:1;
  width:100%;
  height:100%;
  object-fit:cover;
}
.media--16x9{aspect-ratio:16 / 9}
.media--4x3{aspect-ratio:4 / 3}
.media--3x2{aspect-ratio:3 / 2}
.media--1x1{aspect-ratio:1 / 1}
.media--21x9{aspect-ratio:21 / 9}
.media--fill{height:100%;min-height:180px}
.media__caption{
  position:absolute;
  left:0;
  right:0;
  bottom:0;
  z-index:2;
  padding:26px 14px 10px;
  font-size:12px;
  letter-spacing:.04em;
  line-height:1.5;
  color:var(--cool);
  background:linear-gradient(to top,rgba(4,26,21,.94),rgba(4,26,21,0));
}

.breadcrumbs{padding-block:18px 0}
.breadcrumbs__list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--muted);
}
.breadcrumbs__item{display:inline-flex;align-items:center;gap:8px}
.breadcrumbs__item + .breadcrumbs__item::before{content:"/";color:var(--line)}
.breadcrumbs__item[aria-current="page"]{color:var(--cool)}

/* ---------- 06 头部 ---------- */
.skip-link{
  position:fixed;
  left:var(--gutter);
  top:8px;
  z-index:200;
  transform:translateY(-160%);
  background-color:var(--neon);
  color:#04211B;
  font-size:13px;
  font-weight:600;
  padding:10px 18px;
  transition:transform 180ms var(--ease);
}
.skip-link:focus{transform:translateY(0)}

.site-header{
  position:sticky;
  top:0;
  z-index:80;
  background-color:transparent;
  border-bottom:1px solid transparent;
  transition:background-color var(--dur) var(--ease),
             border-color var(--dur) var(--ease);
}
.site-header[data-scrolled]{
  background-color:var(--ink-900);
  border-bottom-color:var(--line);
}
.site-header__inner{
  display:flex;
  align-items:center;
  gap:clamp(14px,3vw,40px);
  min-height:var(--header-h);
  transition:min-height var(--dur) var(--ease);
}
.site-header[data-scrolled] .site-header__inner{min-height:var(--header-h-sm)}

.brand{
  display:flex;
  flex-direction:column;
  gap:2px;
  flex:0 0 auto;
  padding-block:6px;
}
.brand__mark{
  font-family:var(--font-display);
  font-weight:700;
  font-size:20px;
  line-height:1.1;
  letter-spacing:-0.02em;
  color:var(--white);
  white-space:nowrap;
}
.brand__accent{
  margin-left:3px;
  font-family:var(--font-mono);
  font-weight:500;
  font-size:.76em;
  letter-spacing:.02em;
  color:var(--neon);
}
.brand__tagline{
  font-size:11px;
  line-height:1.3;
  letter-spacing:.06em;
  color:var(--muted);
  white-space:nowrap;
}

.site-nav{margin-left:auto}
.site-nav__list{
  display:flex;
  align-items:center;
  gap:clamp(12px,2vw,32px);
}
.site-nav__link{
  position:relative;
  display:inline-block;
  padding:6px 0;
  font-size:14px;
  font-weight:500;
  color:var(--cool);
  white-space:nowrap;
  transition:color var(--dur) var(--ease);
}
.site-nav__link::after{
  content:"";
  position:absolute;
  left:0;
  right:0;
  bottom:0;
  height:2px;
  background-color:var(--neon);
  transform:scaleX(0);
  transform-origin:0 50%;
  transition:transform var(--dur) var(--ease);
}
.site-nav__link:hover{color:var(--white)}
.site-nav__link:hover::after{transform:scaleX(1)}
.site-nav__link[aria-current="page"]{color:var(--neon)}
.site-nav__link[aria-current="page"]::after{transform:scaleX(1)}

.site-header__actions{
  display:flex;
  align-items:center;
  gap:10px;
  flex:0 0 auto;
}

.nav-toggle{
  position:relative;
  display:none;
  width:44px;
  height:40px;
  border:1px solid var(--line);
  transition:border-color var(--dur) var(--ease);
}
.nav-toggle:hover{border-color:var(--neon)}
.nav-toggle__bar{
  position:absolute;
  left:12px;
  right:12px;
  height:1px;
  background-color:var(--cool);
  transition:transform var(--dur) var(--ease),opacity var(--dur) var(--ease);
}
.nav-toggle__bar:nth-of-type(1){top:14px}
.nav-toggle__bar:nth-of-type(2){top:20px}
.nav-toggle__bar:nth-of-type(3){top:26px}
.nav-toggle[aria-expanded="true"]{border-color:var(--neon)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-of-type(1){transform:translateY(6px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-of-type(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-of-type(3){transform:translateY(-6px) rotate(-45deg)}

.scroll-progress{
  position:absolute;
  left:0;
  right:0;
  bottom:-1px;
  display:block;
  height:2px;
  width:100%;
  transform:scaleX(0);
  transform-origin:0 50%;
  background-image:linear-gradient(90deg,var(--neon) 0%,var(--neon-deep) 55%,var(--signal) 100%);
  opacity:0;
  pointer-events:none;
  transition:opacity var(--dur) var(--ease);
}

@media (max-width:960px){
  .brand__tagline{display:none}
  .nav-toggle{display:block}
  .site-nav{
    position:absolute;
    top:100%;
    left:0;
    right:0;
    margin-left:0;
    display:none;
    max-height:calc(100vh - var(--header-h-sm) - 16px);
    overflow-y:auto;
    padding:6px var(--gutter) 20px;
    background-color:var(--ink-900);
    border-top:1px solid var(--line);
    border-bottom:1px solid var(--line);
  }
  .site-nav[data-open]{display:block}
  .site-nav__list{
    flex-direction:column;
    align-items:stretch;
    gap:0;
  }
  .site-nav__item + .site-nav__item{border-top:1px solid var(--line)}
  .site-nav__link{
    display:block;
    padding:15px 2px;
    font-size:16px;
  }
  .site-nav__link::after{display:none}
  .site-nav__link[aria-current="page"]{color:var(--neon)}
}

@media (max-width:420px){
  .site-header__actions .btn{padding:8px 12px;font-size:12px}
}

/* ---------- 07 页脚 ---------- */
.site-footer{
  margin-top:clamp(48px,7vw,110px);
  background-color:var(--ink-850);
  border-top:1px solid var(--line);
  padding-top:clamp(6px,1.5vw,18px);
  font-size:14px;
}
.site-footer__grid{
  display:grid;
  grid-template-columns:1.3fr 1fr 1fr 1.25fr;
  gap:0;
  border-top:1px solid var(--line);
}
.footer-col{
  min-width:0;
  padding:clamp(20px,2.4vw,34px) clamp(16px,2vw,28px);
  border-left:1px solid var(--line);
}
.footer-col:first-child{border-left:0;padding-left:0}
.footer-col:last-child{padding-right:0}

.footer-title{
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:500;
  letter-spacing:.08em;
  text-transform:uppercase;
  color:var(--muted);
  margin-bottom:14px;
}
.footer-brand{
  font-family:var(--font-display);
  font-weight:700;
  font-size:20px;
  letter-spacing:-0.02em;
  line-height:1.2;
  color:var(--white);
}
.footer-tagline{
  margin-top:8px;
  max-width:26ch;
  font-size:13px;
  line-height:1.6;
  color:var(--muted);
}
.footer-icp{
  margin-top:12px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.04em;
  color:var(--muted);
}
.footer-list{
  display:flex;
  flex-direction:column;
  gap:10px;
}
.footer-list a,
.footer-list--plain li{
  overflow-wrap:anywhere;
}
.footer-link{
  font-size:14px;
  color:var(--cool);
}
.footer-link:hover{color:var(--neon)}
.footer-list--plain li{
  font-size:13px;
  line-height:1.6;
  color:var(--muted);
}
.footer-note{
  font-size:12px;
  line-height:1.6;
  color:var(--muted);
  opacity:.85;
}

.site-footer__meta{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:12px 24px;
  padding-block:18px;
  border-top:1px solid var(--line);
}
.legal-nav{
  display:flex;
  flex-wrap:wrap;
  gap:clamp(12px,2vw,26px);
}
.legal-nav a{
  font-size:13px;
  color:var(--muted);
}
.legal-nav a:hover{color:var(--neon)}

.site-footer__bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:8px 24px;
  padding-block:16px 22px;
  border-top:1px solid var(--line);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.04em;
  color:var(--muted);
}

@media (max-width:1024px){
  .site-footer__grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-col{
    padding:22px 0;
    border-left:0;
    border-top:1px solid var(--line);
  }
  .footer-col:nth-child(1),
  .footer-col:nth-child(2){border-top:0}
}
@media (max-width:620px){
  .site-footer__grid{grid-template-columns:minmax(0,1fr)}
  .footer-col{
    padding:20px 0;
    border-top:1px solid var(--line);
  }
  .footer-col:first-child{border-top:0}
  .footer-col:nth-child(2){border-top:1px solid var(--line)}
}

/* ---------- 08 工具类 ---------- */
.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;
}

/* ---------- 09 动效与无障碍 ---------- */
[data-reveal]{
  transition:opacity var(--dur) var(--ease),transform var(--dur) var(--ease);
}
@media (prefers-reduced-motion:no-preference){
  [data-reveal]{
    opacity:0;
    transform:translateY(14px);
  }
  [data-reveal][data-revealed]{
    opacity:1;
    transform:none;
  }
}

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