/* ============================================================
   三亿体育网站进入中国官网 · Site Kit
   file: /assets/site.css
   ============================================================ */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{min-height:100vh}
ul,ol{list-style:none}
a{text-decoration:none;color:inherit}
img{display:block;max-width:100%;height:auto}
button{font:inherit;border:none;background:none;cursor:pointer}
address{font-style:normal}
/* ========== 变量 ========== */
:root{
  --navy:#0B1B3D;
  --teal:#102E3E;
  --green:#2BFF88;
  --orange:#FF7A36;
  --indigo:#3B3F8C;
  --wine:#701C3E;
  --body:#C6D8EC;
  --light:#F0F5FB;
  --error:#9A3B3B;
  --f-headline:"PingFang SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --f-display:"Barlow Condensed","DIN Condensed","Arial Narrow","Helvetica Neue",sans-serif;
  --f-body:"Noto Sans SC","Source Han Sans SC",system-ui,-apple-system,sans-serif;
  --container:1280px;
  --radius:10px;
  --dur:0.3s;
  --ease:cubic-bezier(0.22,1,0.36,1);
}
/* ========== 基础 ========== */
body{
  font-family:var(--f-body);
  font-size:16px;
  line-height:1.7;
  color:var(--body);
  background-color:var(--navy);
  background-image:
    radial-gradient(ellipse at 85% -10%,rgba(59,63,140,0.4),transparent 55%),
    radial-gradient(ellipse at 0% 30%,rgba(16,46,62,0.6),transparent 45%),
    radial-gradient(ellipse at 30% 100%,rgba(112,28,62,0.14),transparent 50%);
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4,h5,h6{
  font-family:var(--f-headline);
  color:var(--light);
  font-weight:900;
  line-height:1.25;
  letter-spacing:-0.01em;
  margin:0 0 0.5em;
}
p{margin:0 0 1em}
::selection{background:var(--green);color:var(--navy)}
::-webkit-scrollbar{width:10px;height:10px}
::-webkit-scrollbar-track{background:var(--navy)}
::-webkit-scrollbar-thumb{background:linear-gradient(180deg,var(--teal),var(--indigo));border-radius:6px;border:2px solid var(--navy)}
::-webkit-scrollbar-thumb:hover{background:var(--green)}
:focus-visible{outline:2px solid var(--green);outline-offset:2px;border-radius:2px}
/* ========== 排版工具 ========== */
.h1{font-size:clamp(36px,6vw,64px)}
.h2{font-size:clamp(30px,5vw,44px)}
.h3{font-size:clamp(22px,3vw,28px)}
/* ========== 容器与栅格 ========== */
.container{width:100%;max-width:var(--container);margin-inline:auto;padding-inline:24px}
.grid{display:grid;gap:24px}
.grid--2{grid-template-columns:repeat(2,1fr)}
.grid--3{grid-template-columns:repeat(3,1fr)}
/* ========== 按钮 ========== */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  font-family:var(--f-headline);
  font-weight:700;
  font-size:15px;
  line-height:1;
  padding:12px 24px;
  border-radius:8px;
  border:2px solid transparent;
  cursor:pointer;
  text-align:center;
  transition:background 0.25s,color 0.25s,border-color 0.25s,transform 0.2s,box-shadow 0.25s;
}
.btn--primary{
  background:var(--orange);
  color:var(--navy);
  border-color:var(--orange);
  box-shadow:0 4px 16px rgba(255,122,54,0.3);
}
.btn--primary:hover{
  background:#ff9260;
  border-color:#ff9260;
  box-shadow:0 6px 24px rgba(255,122,54,0.42);
  transform:translateY(-2px);
}
.btn--ghost{
  border-color:var(--green);
  color:var(--green);
}
.btn--ghost:hover{
  background:rgba(43,255,136,0.12);
  box-shadow:0 0 20px rgba(43,255,136,0.2);
}
.btn--sm{padding:10px 20px;font-size:14px}
.btn--tiny{padding:6px 14px;font-size:12px;border-radius:6px;font-weight:600}
/* ========== 跳转链接 ========== */
.skip-link{
  position:fixed;
  top:-100px;
  left:16px;
  z-index:1200;
  background:var(--green);
  color:var(--navy);
  font-family:var(--f-headline);
  font-weight:800;
  font-size:14px;
  padding:10px 20px;
  border-radius:0 0 10px 10px;
  transition:top 0.2s var(--ease);
  box-shadow:0 0 24px rgba(43,255,136,0.5);
}
.skip-link:focus{top:16px;outline:none}
/* ========== 头部 ========== */
.site-header{
  position:sticky;
  top:0;
  z-index:100;
  background:var(--navy);
  box-shadow:0 8px 32px rgba(0,0,0,0.35);
}
.site-header__main{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:24px;
  min-height:76px;
  position:relative;
}
.site-header__main::after{
  content:"";
  position:absolute;
  left:24px;
  right:24px;
  bottom:0;
  height:1px;
  background:linear-gradient(90deg,transparent,rgba(43,255,136,0.25),rgba(255,122,54,0.4),transparent);
  pointer-events:none;
}
/* 订阅条 */
.sub-bar{
  position:relative;
  background:linear-gradient(90deg,var(--teal) 0%,#153A4A 50%,var(--navy) 100%);
  border-bottom:1px solid rgba(43,255,136,0.15);
}
.sub-bar::after{
  content:"";
  position:absolute;
  bottom:-1px;
  left:0;
  right:0;
  height:1px;
  background:linear-gradient(90deg,var(--green),var(--indigo),var(--orange));
  opacity:0.6;
}
.sub-bar__inner{display:flex;align-items:center;gap:20px;min-height:36px}
.sub-bar__link{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-size:13px;
  font-weight:700;
  color:var(--light);
  transition:color 0.2s;
}
.sub-bar__link:hover{color:var(--green)}
.sub-bar__dot{
  width:8px;height:8px;border-radius:50%;
  background:var(--green);
  animation:pulseDot 2s ease-out infinite;
}
@keyframes pulseDot{
  0%{box-shadow:0 0 0 0 rgba(43,255,136,0.5)}
  70%{box-shadow:0 0 0 9px rgba(43,255,136,0)}
  100%{box-shadow:0 0 0 0 rgba(43,255,136,0)}
}
.sub-bar__text{white-space:nowrap}
.sub-bar__meta{margin-left:auto;font-size:12px;color:var(--body);opacity:0.85;white-space:nowrap}
.sub-bar__cta{margin-left:0;white-space:nowrap}
/* 品牌 */
.brand{display:inline-flex;align-items:center;gap:12px}
.brand__mark{
  display:grid;
  place-items:center;
  width:38px;height:38px;
  border-radius:12px;
  background:linear-gradient(135deg,var(--green),var(--indigo));
  font-family:var(--f-headline);
  font-weight:900;
  font-size:22px;
  color:var(--navy);
  box-shadow:0 0 18px rgba(43,255,136,0.28);
  flex-shrink:0;
}
.brand__text{display:flex;flex-direction:column;gap:2px}
.brand__title{
  font-size:18px;
  font-weight:800;
  color:var(--light);
  letter-spacing:-0.01em;
  line-height:1.3;
  white-space:nowrap;
}
.brand__tagline{
  font-size:10px;
  font-weight:600;
  letter-spacing:0.16em;
  text-transform:uppercase;
  color:var(--green);
  line-height:1.2;
  white-space:nowrap;
}
/* 主导航 */
.site-nav__list{display:flex;align-items:center;gap:4px}
.site-nav__link{
  position:relative;
  display:block;
  padding:10px 16px;
  font-family:var(--f-headline);
  font-weight:600;
  font-size:15px;
  color:var(--body);
  transition:color 0.2s;
  white-space:nowrap;
}
.site-nav__link::after{
  content:"";
  position:absolute;
  left:14px;right:14px;bottom:2px;
  height:3px;
  border-radius:2px;
  background:linear-gradient(90deg,var(--green),var(--orange));
  transform:scaleX(0);
  transform-origin:left;
  transition:transform 0.3s var(--ease);
}
.site-nav__link:hover{color:var(--green)}
.site-nav__link:hover::after{transform:scaleX(1)}
.site-nav__link[aria-current="page"]{
  color:var(--light);
  font-weight:800;
}
.site-nav__link[aria-current="page"]::after{transform:scaleX(1)}
/* 汉堡按钮（桌面隐藏） */
.nav-toggle{display:none}
/* ========== 移动端导航 ========== */
@media (max-width:991px){
  .nav-toggle{
    display:inline-flex;
    align-items:center;
    justify-content:center;
    width:44px;
    height:44px;
    border-radius:8px;
    background:rgba(16,46,62,0.6);
    border:1px solid rgba(43,255,136,0.3);
    transition:background 0.2s,border-color 0.2s;
    flex-shrink:0;
  }
  .nav-toggle:hover{background:rgba(43,255,136,0.1);border-color:var(--green)}
  .nav-toggle__bars{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:5px}
  .nav-toggle__bar{
    display:block;
    width:22px;height:2px;
    border-radius:2px;
    background:var(--green);
    transition:transform 0.3s var(--ease),opacity 0.3s;
  }
  .nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1){transform:translateY(7px) rotate(45deg)}
  .nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2){opacity:0}
  .nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
  .site-nav{
    position:absolute;
    top:100%;
    left:0;right:0;
    background:linear-gradient(180deg,var(--navy) 0%,#0a1630 100%);
    max-height:0;
    overflow:hidden;
    visibility:hidden;
    transition:max-height 0.4s var(--ease),visibility 0s linear 0.4s;
    border-top:1px solid rgba(43,255,136,0.12);
  }
  .site-nav[data-open]{
    max-height:min(80vh,520px);
    overflow-y:auto;
    visibility:visible;
    transition:max-height 0.4s var(--ease),visibility 0s;
    box-shadow:0 24px 48px rgba(0,0,0,0.35);
    border-bottom:2px solid rgba(255,122,54,0.35);
  }
  .site-nav__list{
    flex-direction:column;
    align-items:stretch;
    gap:0;
    padding:12px 20px 20px;
  }
  .site-nav__link{
    display:block;
    text-align:right;
    padding:15px 12px;
    font-size:17px;
    border-right:3px solid transparent;
    transition:border-color 0.2s,color 0.2s,background 0.2s;
  }
  .site-nav__link::after{display:none}
  .site-nav__link:hover{background:rgba(43,255,136,0.06)}
  .site-nav__link[aria-current="page"]{border-right-color:var(--orange)}
}
/* 隐藏屏幕阅读器文本 */
.nav-toggle__sr{
  position:absolute;
  width:1px;height:1px;
  padding:0;margin:-1px;
  overflow:hidden;
  clip:rect(0,0,0,0);
  white-space:nowrap;
  border:0;
}
/* ========== 页脚 ========== */
.site-footer{
  position:relative;
  margin-top:80px;
  background:linear-gradient(180deg,#081228 0%,#060d1f 100%);
  border-top:1px solid rgba(43,255,136,0.1);
}
.site-footer__accent{
  height:4px;
  background:linear-gradient(90deg,var(--indigo) 0%,var(--green) 35%,var(--orange) 70%,var(--wine) 100%);
}
.site-footer__grid{
  display:grid;
  grid-template-columns:1.5fr 0.9fr 0.9fr 1.3fr;
  gap:48px;
  padding:64px 0 40px;
}
.site-footer__col--brand .brand{margin-bottom:20px}
.site-footer__summary{
  font-size:14px;
  color:var(--body);
  line-height:1.75;
  max-width:360px;
}
.site-footer__promise{
  display:inline-block;
  font-size:13px;
  color:var(--green);
  padding:10px 16px;
  border-left:3px solid var(--green);
  background:rgba(43,255,136,0.05);
  border-radius:0 8px 8px 0;
  line-height:1.6;
}
.site-footer__heading{
  font-size:15px;
  font-weight:800;
  color:var(--light);
  letter-spacing:0.04em;
  margin-bottom:16px;
  padding-left:10px;
  border-left:3px solid var(--orange);
}
.site-footer__list{display:flex;flex-direction:column;gap:10px}
.site-footer__link{
  display:inline-block;
  font-size:14px;
  color:var(--body);
  transition:color 0.2s,transform 0.2s;
}
.site-footer__link:hover{color:var(--green);transform:translateX(4px)}
.site-footer__contact{display:flex;flex-direction:column;gap:10px}
.site-footer__contact-item{
  font-size:13px;
  color:var(--body);
  line-height:1.65;
  word-break:break-all;
}
.site-footer__bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:8px 20px;
  padding:20px 0 28px;
  border-top:1px solid rgba(198,216,236,0.08);
  font-size:13px;
  color:var(--body);
  opacity:0.85;
}
.site-footer__icp{font-size:12px}
.site-footer__copyright{font-size:12px}
/* 页脚品牌放大 */
.brand--footer .brand__mark{width:46px;height:46px;font-size:26px;border-radius:14px}
.brand--footer .brand__title{font-size:20px}
.brand--footer .brand__tagline{font-size:11px}
/* ========== 返回顶部 ========== */
.to-top{
  position:fixed;
  right:28px;
  bottom:28px;
  width:56px;height:56px;
  border-radius:50%;
  border:2px solid rgba(43,255,136,0.15);
  background:rgba(11,27,61,0.88);
  display:grid;
  place-items:center;
  cursor:pointer;
  opacity:0;
  visibility:hidden;
  transform:translateY(16px);
  transition:opacity 0.3s var(--ease),visibility 0.3s var(--ease),transform 0.3s var(--ease),border-color 0.3s,box-shadow 0.3s;
  z-index:999;
}
.to-top.is-visible{opacity:1;visibility:visible;transform:translateY(0)}
.to-top:hover{border-color:var(--green);box-shadow:0 0 24px rgba(43,255,136,0.3)}
.to-top__ring{
  position:absolute;
  inset:0;
  width:100%;height:100%;
  transform:rotate(-90deg);
  pointer-events:none;
}
.to-top__track{stroke:var(--teal)}
.to-top__bar{
  stroke:var(--green);
  stroke-dasharray:132;
  stroke-dashoffset:132;
  transition:stroke-dashoffset 0.1s linear;
}
.to-top__arrow{
  position:relative;
  z-index:1;
  font-size:22px;
  font-weight:700;
  color:var(--green);
  line-height:1;
}
/* ========== 面包屑 ========== */
.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  padding:22px 0;
  font-size:13px;
}
.breadcrumb a{color:var(--body);transition:color 0.2s}
.breadcrumb a:hover{color:var(--green)}
.breadcrumb [aria-current="page"]{color:var(--light);font-weight:600}
.breadcrumb__sep::before{content:"/";color:var(--body);opacity:0.5;margin-right:8px}
/* ========== 章节 ========== */
.section{padding:64px 0}
.section__head{
  display:flex;
  align-items:flex-end;
  justify-content:space-between;
  flex-wrap:wrap;
  gap:16px;
  margin-bottom:32px;
}
.section__title{
  display:flex;
  align-items:center;
  gap:14px;
  font-size:clamp(30px,5vw,44px);
}
.section__title::before{
  content:"";
  width:6px;height:0.8em;
  border-radius:3px;
  background:linear-gradient(180deg,var(--green),var(--orange));
  flex-shrink:0;
}
/* ========== 卡片与标签 ========== */
.card{
  background:linear-gradient(160deg,var(--teal) 0%,rgba(16,46,62,0.55) 100%);
  border:1px solid rgba(198,216,236,0.08);
  border-radius:16px;
  padding:28px;
  transition:transform 0.3s var(--ease),box-shadow 0.3s var(--ease),border-color 0.3s;
}
.card:hover{
  transform:translateY(-4px);
  border-color:rgba(43,255,136,0.25);
  box-shadow:0 12px 32px rgba(0,0,0,0.3),0 0 0 1px rgba(43,255,136,0.12);
}
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 14px;
  border-radius:20px;
  font-size:12px;
  font-weight:700;
  background:rgba(43,255,136,0.1);
  color:var(--green);
  border:1px solid rgba(43,255,136,0.3);
}
.tag--orange{
  background:rgba(255,122,54,0.1);
  color:var(--orange);
  border-color:rgba(255,122,54,0.3);
}
/* ========== 数据数字与纵向注记 ========== */
.data-num{
  font-family:var(--f-display);
  font-weight:800;
  font-style:italic;
  font-size:clamp(64px,12vw,160px);
  line-height:1;
  color:var(--light);
  letter-spacing:-0.03em;
}
.vert-label{
  writing-mode:vertical-rl;
  font-size:12px;
  font-weight:700;
  letter-spacing:0.2em;
  color:var(--body);
  opacity:0.7;
  white-space:nowrap;
}
/* ========== 图片容器 ========== */
.img-frame{
  position:relative;
  overflow:hidden;
  border-radius:14px;
  background:linear-gradient(135deg,var(--teal),var(--indigo));
}
.img-frame::before{content:"";display:block;padding-bottom:56.25%}
.img-frame--portrait::before{padding-bottom:125%}
.img-frame--square::before{padding-bottom:100%}
.img-frame>img{
  position:absolute;
  inset:0;
  width:100%;
  height:100%;
  object-fit:cover;
}
/* ========== 响应式 ========== */
@media (max-width:991px){
  .site-footer__grid{
    grid-template-columns:1fr 1fr;
    gap:40px 32px;
    padding:48px 0 32px;
  }
  .site-footer__col--brand{grid-column:1/-1}
  .grid--3{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:640px){
  .container{padding-inline:16px}
  .brand__mark{width:32px;height:32px;font-size:18px;border-radius:10px}
  .brand__title{font-size:15px}
  .brand__tagline{display:none}
  .site-header__main{min-height:64px}
  .sub-bar__meta{display:none}
  .sub-bar__inner{gap:12px}
  .sub-bar__link{font-size:12px}
  .sub-bar__cta{font-size:11px;padding:5px 10px}
  .site-footer__grid{grid-template-columns:1fr;gap:32px 0}
  .site-footer__col--brand{grid-column:auto}
  .grid--2,.grid--3{grid-template-columns:1fr}
  .section{padding:44px 0}
  .to-top{right:16px;bottom:16px;width:48px;height:48px}
  .to-top__arrow{font-size:18px}
  .site-footer__bottom{flex-direction:column;align-items:flex-start;gap:6px}
}
/* ========== 减少动效 ========== */
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:0.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:0.01ms !important;
    transition-delay:0s !important;
    scroll-behavior:auto !important;
  }
  .sub-bar__dot{animation:none}
  .site-nav{transition:none}
  .to-top__bar{transition:none}
}