/* ===================================================================
   爱体育优惠 · /assets/site.css
   共享外壳：reset / 变量 / 中文排版 / 页头 / 页脚 / 通用组件
   =================================================================== */

/* ---------- 1. 设计变量 ---------- */
:root{
  --c-ice:#061B2E;
  --c-panel:#0D3550;
  --c-line:#7FD3F2;
  --c-accent:#FF6B1A;
  --c-red:#E3362C;
  --c-yellow:#FFC400;
  --c-white:#F4FAFF;
  --c-muted:#9DB4C9;
  --c-grid:#1E5A75;
  --c-deep:#08111C;

  --font-display:"Barlow Condensed","Oswald","Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --font-mono:"IBM Plex Mono","Roboto Mono",ui-monospace,Menlo,Consolas,monospace;
  --font-body:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",sans-serif;

  --shell:1280px;
  --gutter:32px;
  --hair:1px solid var(--c-grid);
  --ease:cubic-bezier(.22,.61,.36,1);
}

@media (max-width:640px){
  :root{ --gutter:20px; }
}

/* ---------- 2. reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,p,figure,blockquote,ul,ol,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
table{border-collapse:collapse;width:100%}

/* ---------- 3. 基础排版 ---------- */
body{
  background-color:var(--c-ice);
  background-image:
    linear-gradient(112deg,rgba(127,211,242,.075) 0%,rgba(127,211,242,0) 34%),
    linear-gradient(292deg,rgba(255,107,26,.055) 0%,rgba(255,107,26,0) 24%);
  background-repeat:no-repeat;
  background-size:100% 720px,100% 620px;
  background-position:0 0,0 100%;
  color:var(--c-white);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

h1,h2,h3,h4{
  font-family:var(--font-display);
  font-weight:700;
  line-height:1.14;
  letter-spacing:.015em;
  color:var(--c-white);
}
h1{font-size:clamp(34px,6vw,64px)}
h2{font-size:clamp(26px,3.6vw,40px)}
h3{font-size:clamp(19px,2.2px + 1.2vw,24px)}
h4{font-size:17px;letter-spacing:.04em}

p{color:var(--c-muted);font-size:16px;line-height:1.75}
p strong,b{color:var(--c-white);font-weight:700}
small{font-size:13px;color:var(--c-muted)}
::selection{background:var(--c-accent);color:var(--c-deep)}

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

/* ---------- 4. 跳转链接 ---------- */
.skip-link{
  position:fixed;
  left:16px;
  top:-72px;
  z-index:200;
  padding:10px 18px;
  background:var(--c-accent);
  color:var(--c-deep);
  font-family:var(--font-display);
  font-size:15px;
  font-weight:700;
  letter-spacing:.06em;
  transition:top .16s var(--ease);
}
.skip-link:focus{top:12px}

/* ---------- 5. 页头 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:80;
  background:var(--c-ice);
}

.header-utility{
  background:var(--c-deep);
  border-bottom:var(--hair);
}
.header-utility__inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:24px;
  min-height:58px;
  padding-top:8px;
  padding-bottom:8px;
}
.header-utility__side{
  display:flex;
  align-items:center;
  gap:16px;
  flex-wrap:wrap;
  justify-content:flex-end;
}

/* 品牌标记：双色比分牌 */
.brand{
  display:inline-flex;
  align-items:center;
  gap:12px;
  min-width:0;
}
.brand__mark{
  position:relative;
  flex:0 0 36px;
  width:36px;
  height:26px;
  background:var(--c-accent);
  box-shadow:0 0 0 1px var(--c-grid);
  overflow:hidden;
}
.brand__mark::before{
  content:"";
  position:absolute;
  inset:0;
  background:var(--c-line);
  clip-path:polygon(100% 0,100% 100%,40% 100%);
}
.brand__mark::after{
  content:"";
  position:absolute;
  left:0;
  bottom:0;
  width:100%;
  height:2px;
  background:rgba(8,17,28,.55);
}
.brand__text{
  display:flex;
  flex-direction:column;
  min-width:0;
}
.brand__name{
  font-family:var(--font-display);
  font-size:20px;
  font-weight:700;
  letter-spacing:.08em;
  color:var(--c-white);
  line-height:1.1;
  white-space:nowrap;
}
.brand__note{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.08em;
  color:var(--c-muted);
  line-height:1.5;
  margin-top:2px;
  white-space:nowrap;
}
.brand:hover .brand__name,
.brand:focus-visible .brand__name{color:var(--c-line)}

/* 版本徽标 */
.header-status{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:4px 10px;
  border:1px solid var(--c-grid);
  background:rgba(13,53,80,.6);
  color:var(--c-muted);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.04em;
  white-space:nowrap;
}
.header-status__dot{
  width:6px;
  height:6px;
  flex:0 0 6px;
  border-radius:50%;
  background:var(--c-yellow);
  box-shadow:0 0 0 3px rgba(255,196,0,.16);
}

.utility-link{
  color:var(--c-line);
  font-size:13px;
  letter-spacing:.04em;
  border-bottom:1px solid transparent;
  padding-bottom:2px;
  transition:color .16s var(--ease),border-color .16s var(--ease);
}
.utility-link:hover,
.utility-link:focus-visible{
  color:var(--c-white);
  border-bottom-color:var(--c-accent);
}

/* 主导航条 */
.header-main{
  position:relative;
  background:var(--c-ice);
  border-bottom:var(--hair);
}
.header-main__inner{
  display:flex;
  align-items:stretch;
  flex-wrap:wrap;
}

.nav-toggle{
  display:none;
  align-items:center;
  gap:10px;
  min-height:60px;
  padding:0 18px;
  border-right:var(--hair);
  color:var(--c-white);
  font-family:var(--font-display);
  font-size:13px;
  letter-spacing:.14em;
}
.nav-toggle__bars{
  position:relative;
  display:block;
  width:18px;
  height:2px;
  background:var(--c-line);
}
.nav-toggle__bars::before,
.nav-toggle__bars::after{
  content:"";
  position:absolute;
  left:0;
  width:18px;
  height:2px;
  background:var(--c-line);
  transition:transform .2s var(--ease),opacity .2s var(--ease);
}
.nav-toggle__bars::before{top:-6px}
.nav-toggle__bars::after{top:6px}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars{background:transparent}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before{transform:translateY(6px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{transform:translateY(-6px) rotate(-45deg)}

.site-nav{
  flex:1 1 auto;
  min-width:0;
  background:var(--c-panel);
}
.site-nav__list{
  display:flex;
  align-items:stretch;
  flex-wrap:nowrap;
}
.site-nav__item{
  display:flex;
  border-left:var(--hair);
}
.site-nav__item:first-child{border-left:0}
.site-nav__link{
  display:flex;
  align-items:center;
  min-height:60px;
  padding:0 18px;
  color:var(--c-white);
  font-size:14px;
  letter-spacing:.02em;
  white-space:nowrap;
  transition:background-color .16s var(--ease),color .16s var(--ease),box-shadow .16s var(--ease);
}
.site-nav__link:hover{
  background:rgba(127,211,242,.10);
  color:var(--c-line);
}
.site-nav__link[aria-current="page"]{
  color:var(--c-accent);
  box-shadow:inset 0 -2px 0 var(--c-accent);
  background:rgba(255,107,26,.08);
}
.site-nav__link--hot{
  background:var(--c-accent);
  color:var(--c-deep);
  font-family:var(--font-display);
  font-weight:700;
  letter-spacing:.06em;
}
.site-nav__link--hot:hover{
  background:#FF8A45;
  color:var(--c-deep);
}
.site-nav__link--hot[aria-current="page"]{
  background:var(--c-accent);
  color:var(--c-deep);
  box-shadow:inset 0 -3px 0 var(--c-deep);
}

.header-cta{
  display:inline-flex;
  align-items:center;
  margin-left:auto;
  padding:0 22px;
  min-height:60px;
  border-left:var(--hair);
  color:var(--c-line);
  font-family:var(--font-display);
  font-size:14px;
  letter-spacing:.08em;
  white-space:nowrap;
  transition:background-color .16s var(--ease),color .16s var(--ease);
}
.header-cta:hover{
  background:rgba(127,211,242,.12);
  color:var(--c-white);
}

/* 阅读进度 */
.scroll-meter{
  position:absolute;
  left:0;
  bottom:-1px;
  width:0;
  height:2px;
  background:var(--c-accent);
  z-index:3;
  transition:width .08s linear;
}

/* ---------- 6. 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:80px;
  background:var(--c-deep);
  border-top:var(--hair);
  color:var(--c-muted);
  font-size:14px;
}
.site-footer::before{
  content:"";
  display:block;
  height:3px;
  background:linear-gradient(90deg,var(--c-accent) 0 22%,var(--c-grid) 22% 100%);
}
.site-footer .shell{padding-top:48px;padding-bottom:0}

.footer-alert{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:20px 32px;
  padding:20px 24px;
  border:var(--hair);
  border-left:3px solid var(--c-accent);
  background:linear-gradient(100deg,rgba(255,107,26,.13) 0%,rgba(13,53,80,.85) 62%);
}
.footer-alert__head{min-width:220px;flex:1 1 280px}
.footer-alert__title{
  font-size:20px;
  letter-spacing:.06em;
  color:var(--c-white);
}
.footer-alert__desc{
  margin-top:6px;
  font-size:13px;
  line-height:1.6;
  color:var(--c-muted);
}
.footer-alert__links{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
}
.footer-alert__item{display:flex}
.footer-alert__link{
  display:inline-block;
  padding:9px 15px;
  border:1px solid var(--c-grid);
  background:rgba(6,27,46,.55);
  color:var(--c-white);
  font-size:13px;
  letter-spacing:.03em;
  transition:border-color .16s var(--ease),color .16s var(--ease),background-color .16s var(--ease);
}
.footer-alert__link:hover{
  border-color:var(--c-line);
  color:var(--c-line);
  background:rgba(127,211,242,.10);
}

.footer-grid{
  display:grid;
  grid-template-columns:1.5fr 1fr 1fr 1.5fr;
  gap:44px 32px;
  padding:48px 0 44px;
}
.footer-col{min-width:0}
.footer-col__title{
  font-family:var(--font-display);
  font-size:13px;
  font-weight:700;
  letter-spacing:.18em;
  color:var(--c-line);
  padding-bottom:9px;
  margin-bottom:16px;
  border-bottom:var(--hair);
}
.footer-note{
  margin-top:16px;
  font-size:13px;
  line-height:1.7;
  color:var(--c-muted);
  max-width:30ch;
}
.brand--footer{align-items:flex-start}
.brand--footer .brand__name{font-size:19px}
.brand--footer .brand__note{
  font-size:10.5px;
  letter-spacing:.03em;
  white-space:normal;
  word-break:break-all;
}

.footer-list{
  display:grid;
  gap:10px;
}
.footer-list__item{display:block}
.footer-list__link{
  display:inline-block;
  color:var(--c-muted);
  font-size:14px;
  line-height:1.5;
  border-bottom:1px solid transparent;
  transition:color .16s var(--ease),border-color .16s var(--ease);
}
.footer-list__link:hover{
  color:var(--c-white);
  border-bottom-color:var(--c-accent);
}

.footer-contact{display:block}
.footer-contact__label{
  display:block;
  font-size:11px;
  letter-spacing:.14em;
  color:var(--c-line);
  opacity:.72;
}
.footer-contact__value{
  display:block;
  margin-top:2px;
  font-family:var(--font-mono);
  font-size:13px;
  line-height:1.6;
  color:var(--c-white);
  word-break:break-word;
}
.footer-contact + .footer-contact{margin-top:14px}

.footer-bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:12px 28px;
  padding:18px 0 28px;
  border-top:var(--hair);
  font-family:var(--font-mono);
  font-size:12.5px;
  letter-spacing:.02em;
}
.footer-bottom__item{color:var(--c-muted)}
.footer-legal{display:flex;flex-wrap:wrap;gap:18px}
.footer-legal__item{display:flex}
.footer-legal__link{
  color:var(--c-muted);
  border-bottom:1px solid transparent;
  transition:color .16s var(--ease),border-color .16s var(--ease);
}
.footer-legal__link:hover{
  color:var(--c-line);
  border-bottom-color:var(--c-line);
}

/* ---------- 7. 通用布局组件 ---------- */
.shell{
  width:100%;
  max-width:var(--shell);
  margin:0 auto;
  padding-left:var(--gutter);
  padding-right:var(--gutter);
}

.content-wrap{
  max-width:72ch;
  margin:0 auto;
}
.content-wrap p + p{margin-top:14px}

.grid{
  display:grid;
  gap:24px;
  grid-template-columns:repeat(12,minmax(0,1fr));
}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}

.section-head{
  display:flex;
  align-items:baseline;
  justify-content:space-between;
  gap:16px;
  padding-bottom:12px;
  border-bottom:var(--hair);
  margin-bottom:24px;
}
.section-head__title{
  font-family:var(--font-display);
  font-size:clamp(24px,3vw,34px);
  letter-spacing:.03em;
  color:var(--c-white);
}
.section-head__label{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.16em;
  color:var(--c-line);
  white-space:nowrap;
}

/* ---------- 8. 通用按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:12px 22px;
  border:1px solid var(--c-grid);
  background:transparent;
  color:var(--c-white);
  font-family:var(--font-display);
  font-size:15px;
  font-weight:700;
  letter-spacing:.06em;
  line-height:1.2;
  text-align:center;
  transition:background-color .16s var(--ease),color .16s var(--ease),border-color .16s var(--ease);
}
.btn:hover{background:rgba(127,211,242,.12);border-color:var(--c-line);color:var(--c-line)}
.btn--primary{
  background:var(--c-accent);
  border-color:var(--c-accent);
  color:var(--c-deep);
}
.btn--primary:hover{
  background:#FF8A45;
  border-color:#FF8A45;
  color:var(--c-deep);
}
.btn--ghost{
  background:transparent;
  border-color:var(--c-line);
  color:var(--c-line);
}
.btn--ghost:hover{
  background:rgba(127,211,242,.14);
  border-color:var(--c-line);
  color:var(--c-white);
}

/* ---------- 9. 面包屑 ---------- */
.crumbs{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:6px;
  padding:18px 0 0;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.04em;
  color:var(--c-muted);
}
.crumbs__item{display:flex;align-items:center}
.crumbs__item + .crumbs__item::before{
  content:"/";
  margin-right:6px;
  color:var(--c-grid);
}
.crumbs__link{
  color:var(--c-line);
  border-bottom:1px solid transparent;
  transition:border-color .16s var(--ease);
}
.crumbs__link:hover{border-bottom-color:var(--c-line)}
.crumbs__item[aria-current="page"]{color:var(--c-muted)}

/* ---------- 10. 图片容器基础规则 ---------- */
.img-frame{
  position:relative;
  display:block;
  width:100%;
  overflow:hidden;
  aspect-ratio:16 / 9;
  border:var(--hair);
  background:var(--c-panel);
}
.img-frame img{
  width:100%;
  height:100%;
  object-fit:cover;
  display:block;
}
.img-frame::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background:linear-gradient(118deg,rgba(127,211,242,.20) 0%,rgba(127,211,242,0) 46%,rgba(255,107,26,.14) 100%);
}
.img-frame--wide{aspect-ratio:21 / 9}
.img-frame--tall{aspect-ratio:3 / 4}
.img-frame--square{aspect-ratio:1 / 1}
.img-frame__caption{
  display:block;
  margin-top:8px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.04em;
  color:var(--c-muted);
}

/* ---------- 11. 文本工具 ---------- */
.num{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  letter-spacing:.02em;
}
.annotation{
  font-size:12.5px;
  font-weight:500;
  letter-spacing:.08em;
  line-height:1.6;
  color:var(--c-muted);
}
.annotation--vertical{
  writing-mode:vertical-rl;
  text-orientation:mixed;
  letter-spacing:.18em;
}

/* ---------- 12. 滚动显现协议 ---------- */
.js-reveal [data-reveal]{
  opacity:0;
  transform:translateY(12px);
  transition:opacity .52s var(--ease),transform .52s var(--ease);
  transition-delay:var(--reveal-delay,0ms);
  will-change:opacity,transform;
}
.js-reveal [data-reveal].is-in{
  opacity:1;
  transform:none;
}

/* ---------- 13. 平板 ---------- */
@media (max-width:1024px){
  .footer-grid{
    grid-template-columns:1.4fr 1fr 1fr;
  }
  .footer-col:last-child{grid-column:1 / -1}
  .footer-col:last-child .footer-list{
    grid-template-columns:repeat(3,minmax(0,1fr));
    display:grid;
  }
  .footer-contact + .footer-contact{margin-top:0}
  .site-nav__link{padding:0 14px;font-size:13.5px}
  .header-cta{padding:0 16px}
}

/* ---------- 14. 手机 / 移动导航 ---------- */
@media (max-width:900px){
  .nav-toggle{display:inline-flex}
  .site-nav{
    display:none;
    flex:1 1 100%;
    width:100%;
    border-top:var(--hair);
    background:var(--c-panel);
  }
  .site-nav[data-open="true"]{display:block}
  .site-nav__list{
    flex-direction:column;
    flex-wrap:nowrap;
    width:100%;
  }
  .site-nav__item{
    border-left:0;
    border-top:var(--hair);
  }
  .site-nav__item:first-child{border-top:0}
  .site-nav__link{
    min-height:54px;
    padding:0 20px;
    font-size:15px;
    width:100%;
  }
  .site-nav__link[aria-current="page"]{box-shadow:inset 3px 0 0 var(--c-accent)}
  .site-nav__link--hot[aria-current="page"]{box-shadow:inset 3px 0 0 var(--c-deep)}
  .header-cta{margin-left:auto;min-height:60px}

  .footer-grid{
    grid-template-columns:repeat(2,minmax(0,1fr));
    gap:36px 24px;
    padding:40px 0 36px;
  }
  .footer-col:last-child{grid-column:1 / -1}
  .footer-col:last-child .footer-list{grid-template-columns:1fr}
  .footer-alert{padding:18px 20px}
  .site-footer{margin-top:64px}
}

@media (max-width:640px){
  .header-utility__inner{min-height:52px;gap:12px}
  .header-utility__side{gap:10px}
  .header-status{font-size:11px;padding:3px 8px;gap:6px}
  .utility-link{font-size:12px}
  .brand__mark{flex-basis:30px;width:30px;height:22px}
  .brand__name{font-size:17px;letter-spacing:.06em}
  .brand__note{font-size:10px}
  .header-cta{font-size:13px;padding:0 14px}
  .nav-toggle{padding:0 14px;min-height:56px}
  .site-nav__link{min-height:52px}

  .footer-grid{grid-template-columns:1fr;gap:32px}
  .footer-col:last-child .footer-list{grid-template-columns:1fr}
  .footer-alert__links{width:100%}
  .footer-alert__link{padding:8px 12px;font-size:12.5px}
  .footer-bottom{font-size:11.5px;gap:10px 18px}
  .footer-legal{gap:14px}
  .brand--footer .brand__note{white-space:normal}
  .section-head{flex-wrap:wrap;gap:6px}
}

/* ---------- 15. 降低动效 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .js-reveal [data-reveal]{
    opacity:1 !important;
    transform:none !important;
    transition:none !important;
  }
  .scroll-meter{transition:none}
  .skip-link{transition:none}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    transition-delay:0ms !important;
  }
}