/* ============================================================
   一体育主站 · 共享样式 /assets/site.css
   ============================================================ */

/* ---------- 1. 设计变量 ---------- */
:root{
  --c-green:#0E7C66;
  --c-green-deep:#075247;
  --c-green-bright:#2FBF9A;
  --c-orange:#F26B1D;
  --c-orange-soft:#FF9A4D;
  --c-ink:#0B1F33;
  --c-navy:#12314D;
  --c-sand:#F4E9D8;
  --c-paper:#FFFBF4;
  --c-gray:#6B7A86;
  --c-line:#D8CBB8;
  --c-alert:#B83A2D;

  --font-sans:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"IBM Plex Mono","JetBrains Mono",ui-monospace,SFMono-Regular,"Cascadia Mono",Menlo,Consolas,monospace;

  --layout-max:1240px;
  --gutter:24px;

  --ease:cubic-bezier(.22,.7,.28,1);
  --dur-fast:.2s;
  --dur:.3s;
}

/* ---------- 2. 重置与基础排版 ---------- */
*,
*::before,
*::after{box-sizing:border-box;}

html{
  -webkit-text-size-adjust:100%;
  text-size-adjust:100%;
  scroll-behavior:smooth;
}

body{
  margin:0;
  background:var(--c-sand);
  color:var(--c-ink);
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.75;
  font-weight:400;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}

h1,h2,h3,h4,h5,h6{
  margin:0;
  font-weight:900;
  line-height:1.16;
  letter-spacing:-.02em;
  color:var(--c-ink);
}

p{margin:0 0 1em;}
p:last-child{margin-bottom:0;}

a{color:var(--c-green);}

img,svg,video{display:block;max-width:100%;}
img{height:auto;}

ul,ol{margin:0;padding:0;list-style:none;}

button{font:inherit;color:inherit;}

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

/* ---------- 3. 跳转链接 ---------- */
.skip-link{
  position:fixed;
  top:10px;
  left:10px;
  z-index:200;
  padding:10px 18px;
  background:var(--c-ink);
  color:var(--c-paper);
  font-size:14px;
  font-weight:600;
  text-decoration:none;
  transform:translateY(-200%);
  transition:transform var(--dur) var(--ease);
}
.skip-link:focus,
.skip-link:focus-visible{transform:translateY(0);}

/* ---------- 4. 布局工具 ---------- */
.container{
  width:100%;
  max-width:var(--layout-max);
  margin-inline:auto;
  padding-inline:var(--gutter);
}

.grid{
  display:grid;
  gap:var(--gap,28px);
  grid-template-columns:1fr;
}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr));}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr));}

/* ---------- 5. 章节与标题组 ---------- */
.section{
  padding-block:clamp(40px,6vw,76px);
}
.section__head{
  display:flex;
  flex-wrap:wrap;
  align-items:flex-end;
  justify-content:space-between;
  gap:14px 32px;
  margin-bottom:clamp(22px,3vw,36px);
  padding-bottom:16px;
  border-bottom:1px solid var(--c-line);
}
.section__title{
  font-size:clamp(22px,2.4vw,28px);
  margin:0;
}
.section__desc{
  max-width:34em;
  font-size:15px;
  line-height:1.75;
  color:var(--c-gray);
  margin:0;
}

.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-size:12px;
  font-weight:700;
  letter-spacing:.18em;
  color:var(--c-green);
  margin-bottom:12px;
}
.eyebrow::before{
  content:"";
  width:28px;
  height:2px;
  background:var(--c-orange);
  flex:0 0 auto;
}

.mono{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  letter-spacing:.01em;
}

.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:3px 10px;
  font-size:12px;
  font-weight:600;
  line-height:1.65;
  background:rgba(14,124,102,.1);
  color:var(--c-green-deep);
  white-space:nowrap;
}
.tag--orange{
  background:rgba(242,107,29,.14);
  color:#A6420C;
}

.rule{
  height:2px;
  border:0;
  margin:0;
  background:repeating-linear-gradient(90deg,var(--c-line) 0 8px,transparent 8px 14px);
}

/* ---------- 6. 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  padding:12px 24px;
  font-size:15px;
  font-weight:700;
  line-height:1.25;
  text-decoration:none;
  border:1px solid transparent;
  background:var(--c-green);
  color:var(--c-paper);
  cursor:pointer;
  clip-path:polygon(0 0,100% 0,100% calc(100% - 11px),calc(100% - 11px) 100%,0 100%);
  transition:background-color var(--dur-fast) var(--ease),color var(--dur-fast) var(--ease),transform var(--dur-fast) var(--ease);
}
.btn:hover{background:var(--c-green-deep);transform:translateY(-1px);}
.btn--accent{background:var(--c-orange);color:var(--c-paper);}
.btn--accent:hover{background:var(--c-orange-soft);color:var(--c-ink);}
.btn--ghost{background:transparent;color:var(--c-green);border-color:var(--c-green);}
.btn--ghost:hover{background:var(--c-green);color:var(--c-paper);}

/* ---------- 7. 图片容器（供页面阶段放置占位图） ---------- */
.media{
  position:relative;
  display:block;
  overflow:hidden;
  width:100%;
  background:linear-gradient(155deg,var(--c-green) 0%,var(--c-green-deep) 100%);
  clip-path:polygon(0 0,100% 0,100% calc(100% - 18px),calc(100% - 18px) 100%,0 100%);
}
.media::after{
  content:"";
  position:absolute;
  inset:0;
  background-image:
    linear-gradient(rgba(255,251,244,.16) 1px,transparent 1px),
    linear-gradient(90deg,rgba(255,251,244,.16) 1px,transparent 1px);
  background-size:38px 38px;
  pointer-events:none;
  z-index:0;
}
.media img{
  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--1x1{aspect-ratio:1/1;}

@supports not (aspect-ratio:1/1){
  .media--16x9::before,
  .media--4x3::before,
  .media--1x1::before{content:"";display:block;padding-top:56.25%;}
  .media--4x3::before{padding-top:75%;}
  .media--1x1::before{padding-top:100%;}
}

.media__label{
  position:absolute;
  left:14px;
  bottom:12px;
  z-index:2;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.12em;
  color:var(--c-paper);
  background:rgba(11,31,51,.72);
  padding:3px 9px;
}

/* ---------- 8. 切角面板 ---------- */
.cut-panel{
  position:relative;
  padding:22px 24px;
  background:var(--c-paper);
  border-left:3px solid var(--c-green);
  clip-path:polygon(0 0,100% 0,100% calc(100% - 20px),calc(100% - 20px) 100%,0 100%);
}

/* ---------- 9. 面包屑 ---------- */
.breadcrumbs{
  font-size:12.5px;
  line-height:1.6;
  color:var(--c-gray);
  padding-top:18px;
}
.breadcrumbs ol{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:6px;
}
.breadcrumbs li{
  display:inline-flex;
  align-items:center;
  gap:6px;
}
.breadcrumbs li + li::before{
  content:"/";
  color:var(--c-line);
}
.breadcrumbs a{
  color:var(--c-gray);
  text-decoration:none;
  transition:color var(--dur-fast) var(--ease);
}
.breadcrumbs a:hover{color:var(--c-green);}
.breadcrumbs [aria-current="page"]{
  color:var(--c-navy);
  font-weight:600;
}

/* ---------- 10. 页头 ---------- */
.site-header{
  position:relative;
  z-index:40;
  background:var(--c-paper);
  border-bottom:1px solid var(--c-line);
}

.header__shell{
  width:100%;
  max-width:var(--layout-max);
  margin-inline:auto;
  padding-inline:var(--gutter);
}

.header__bar{
  position:relative;
  z-index:90;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:28px;
  min-height:86px;
}

/* 品牌 */
.brand{
  display:inline-flex;
  align-items:center;
  gap:12px;
  flex:0 0 auto;
  text-decoration:none;
  color:var(--c-ink);
}
.brand__mark{
  position:relative;
  display:block;
  width:40px;
  height:40px;
  flex:0 0 auto;
  background:var(--c-green);
  clip-path:polygon(0 0,100% 0,100% 70%,70% 100%,0 100%);
  overflow:hidden;
}
.brand__mark::before,
.brand__mark::after{
  content:"";
  position:absolute;
  top:-22%;
  height:144%;
  transform:rotate(20deg);
}
.brand__mark::before{left:7px;width:11px;background:var(--c-orange);}
.brand__mark::after{left:25px;width:6px;background:rgba(255,251,244,.68);}

.brand__text{
  display:flex;
  flex-direction:column;
  gap:3px;
  line-height:1.08;
}
.brand__name{
  font-size:19px;
  font-weight:900;
  letter-spacing:-.02em;
  color:var(--c-ink);
}
.brand__tag{
  font-size:11px;
  font-weight:500;
  letter-spacing:.2em;
  color:var(--c-gray);
}

/* 主导航 */
.nav{display:flex;align-items:center;}
.nav__list{
  display:flex;
  align-items:center;
  gap:2px;
}
.nav__item{position:relative;}
.nav__link{
  position:relative;
  display:inline-flex;
  align-items:baseline;
  gap:7px;
  padding:9px 13px;
  font-size:15px;
  font-weight:500;
  line-height:1.2;
  color:var(--c-navy);
  text-decoration:none;
  transition:color var(--dur-fast) var(--ease),background-color var(--dur-fast) var(--ease);
}
.nav__link::before{
  content:"";
  position:absolute;
  left:13px;
  right:13px;
  bottom:2px;
  height:2px;
  background:var(--c-orange);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .26s var(--ease);
}
.nav__link:hover{color:var(--c-green);}
.nav__link:hover::before{transform:scaleX(1);}
.nav__idx{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.06em;
  color:var(--c-gray);
  min-width:20px;
  transition:color var(--dur-fast) var(--ease);
}
.nav__link:hover .nav__idx{color:var(--c-orange);}
.nav__link[aria-current="page"]{
  color:var(--c-green);
  background:rgba(14,124,102,.09);
}
.nav__link[aria-current="page"]::before{
  transform:scaleX(1);
  background:var(--c-green);
}
.nav__link[aria-current="page"] .nav__idx{color:var(--c-green);}

/* 移动端汉堡按钮 */
.nav-toggle{
  display:none;
  align-items:center;
  gap:10px;
  padding:9px 15px;
  border:0;
  background:var(--c-green);
  color:var(--c-paper);
  font-size:13px;
  font-weight:700;
  cursor:pointer;
  clip-path:polygon(0 0,100% 0,100% calc(100% - 9px),calc(100% - 9px) 100%,0 100%);
}
.nav-toggle:hover{background:var(--c-green-deep);}
.nav-toggle__bars{
  position:relative;
  display:block;
  width:18px;
  height:12px;
  flex:0 0 auto;
}
.nav-toggle__bars span{
  position:absolute;
  left:0;
  right:0;
  height:2px;
  background:currentColor;
  transition:transform .26s var(--ease),opacity var(--dur-fast) var(--ease);
}
.nav-toggle__bars span:nth-child(1){top:0;}
.nav-toggle__bars span:nth-child(2){top:5px;}
.nav-toggle__bars span:nth-child(3){top:10px;}
.site-header[data-open] .nav-toggle__bars span:nth-child(1){transform:translateY(5px) rotate(45deg);}
.site-header[data-open] .nav-toggle__bars span:nth-child(2){opacity:0;}
.site-header[data-open] .nav-toggle__bars span:nth-child(3){transform:translateY(-5px) rotate(-45deg);}
.nav-toggle__label{white-space:nowrap;}

/* 快捷直达条 */
.header__rail{
  position:relative;
  background:var(--c-ink);
  border-top:3px solid var(--c-green);
  overflow-x:auto;
  overflow-y:hidden;
  -webkit-overflow-scrolling:touch;
  scrollbar-width:thin;
}
.header__rail-inner{
  display:flex;
  align-items:stretch;
  min-width:max-content;
  width:100%;
  max-width:var(--layout-max);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.rail__label{
  display:inline-flex;
  align-items:center;
  flex:0 0 auto;
  padding-right:18px;
  margin-right:6px;
  border-right:1px solid rgba(255,251,244,.14);
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.28em;
  color:var(--c-green-bright);
  white-space:nowrap;
}
.rail__list{
  display:flex;
  align-items:stretch;
}
.rail__item{display:flex;}
.rail__link{
  display:inline-flex;
  align-items:center;
  gap:9px;
  padding:12px 20px;
  font-size:13px;
  font-weight:500;
  white-space:nowrap;
  text-decoration:none;
  color:rgba(255,251,244,.78);
  border-right:1px solid rgba(255,251,244,.1);
  transition:color var(--dur-fast) var(--ease),background-color var(--dur-fast) var(--ease);
}
.rail__link:hover,
.rail__link:focus-visible{
  color:var(--c-paper);
  background:var(--c-green);
}
.rail__num{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.06em;
  color:var(--c-orange-soft);
  transition:color var(--dur-fast) var(--ease);
}
.rail__link:hover .rail__num{color:var(--c-paper);}

/* ---------- 11. 页脚 ---------- */
.site-footer{
  position:relative;
  background:var(--c-ink);
  color:rgba(255,251,244,.7);
  font-size:14px;
}
.site-footer::before{
  content:"";
  display:block;
  height:5px;
  background:repeating-linear-gradient(135deg,var(--c-green) 0 12px,var(--c-orange) 12px 24px);
}

.footer__main{
  width:100%;
  max-width:var(--layout-max);
  margin-inline:auto;
  padding:52px var(--gutter) 42px;
  display:grid;
  grid-template-columns:1.45fr 1fr 1fr 1.25fr;
  gap:36px 40px;
}

.footer__col{min-width:0;}

.brand--footer .brand__name{color:var(--c-paper);}
.brand--footer .brand__tag{color:rgba(255,251,244,.5);}

.footer__note{
  margin:18px 0 0;
  max-width:27em;
  font-size:13.5px;
  line-height:1.75;
  color:rgba(255,251,244,.6);
}

.footer__heading{
  margin:0 0 16px;
  font-size:12.5px;
  font-weight:700;
  letter-spacing:.16em;
  color:var(--c-green-bright);
}

.footer__list{
  display:grid;
  gap:10px;
}
.footer__link{
  display:inline-block;
  font-size:14px;
  line-height:1.6;
  color:rgba(255,251,244,.72);
  text-decoration:none;
  transition:color var(--dur-fast) var(--ease);
}
.footer__link:hover,
.footer__link:focus-visible{
  color:var(--c-orange-soft);
  text-decoration:underline;
  text-underline-offset:4px;
}

.footer__meta{
  display:grid;
  gap:13px;
}
.footer__meta-item{
  display:grid;
  gap:3px;
}
.footer__meta-label{
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.18em;
  color:var(--c-green-bright);
}
.footer__meta-value{
  font-size:13.5px;
  line-height:1.65;
  color:rgba(255,251,244,.8);
}
.footer__mono{
  font-family:var(--font-mono);
  font-size:12.5px;
  letter-spacing:.02em;
  color:var(--c-paper);
  word-break:break-all;
}

.footer__legal{
  border-top:1px solid rgba(255,251,244,.12);
  background:rgba(0,0,0,.18);
}
.footer__legal-inner{
  width:100%;
  max-width:var(--layout-max);
  margin-inline:auto;
  padding:18px var(--gutter);
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:10px 28px;
  font-size:12.5px;
  color:rgba(255,251,244,.55);
}
.footer__copy{margin:0;line-height:1.7;}
.footer__icp{font-family:var(--font-mono);letter-spacing:.02em;}
.footer__legal-links{
  display:flex;
  flex-wrap:wrap;
  gap:8px 20px;
}
.footer__legal-links a{
  color:rgba(255,251,244,.62);
  text-decoration:none;
  transition:color var(--dur-fast) var(--ease);
}
.footer__legal-links a:hover,
.footer__legal-links a:focus-visible{color:var(--c-orange-soft);}

/* ---------- 12. 滚动进度与返回顶部 ---------- */
.scroll-progress{
  position:fixed;
  top:0;
  left:0;
  width:100%;
  height:3px;
  transform:scaleX(0);
  transform-origin:left center;
  background:linear-gradient(90deg,var(--c-green) 0%,var(--c-green-bright) 58%,var(--c-orange) 100%);
  pointer-events:none;
  z-index:120;
}

.to-top{
  position:fixed;
  right:20px;
  bottom:20px;
  z-index:60;
  display:grid;
  place-items:center;
  width:48px;
  height:48px;
  padding:0;
  border:0;
  background:var(--c-green);
  color:var(--c-paper);
  cursor:pointer;
  clip-path:polygon(0 0,100% 0,100% calc(100% - 14px),calc(100% - 14px) 100%,0 100%);
  opacity:0;
  visibility:hidden;
  transform:translateY(12px);
  transition:opacity var(--dur) var(--ease),transform var(--dur) var(--ease),visibility var(--dur),background-color var(--dur-fast) var(--ease);
}
.to-top.is-visible{
  opacity:1;
  visibility:visible;
  transform:translateY(0);
}
.to-top:hover{background:var(--c-orange);}
.to-top:focus-visible{
  outline:3px solid var(--c-orange-soft);
  outline-offset:2px;
  box-shadow:inset 0 0 0 3px var(--c-orange-soft);
}
.to-top__arrow{
  display:block;
  width:11px;
  height:11px;
  border-left:2px solid currentColor;
  border-top:2px solid currentColor;
  transform:rotate(45deg) translate(2px,2px);
}

/* ---------- 13. 滚动显现 ---------- */
html.js [data-reveal]{
  opacity:0;
  transform:translateY(14px);
  transition:opacity .4s var(--ease),transform .4s var(--ease);
}
html.js [data-reveal].is-revealed{
  opacity:1;
  transform:none;
}

/* ---------- 14. 响应式 ---------- */
@media (max-width:1180px){
  .nav__link{padding:9px 9px;font-size:14.5px;}
  .nav__link::before{left:9px;right:9px;}
  .nav__idx{min-width:18px;}
}

@media (max-width:980px){
  .header__bar{
    min-height:72px;
    gap:16px;
  }
  .nav-toggle{display:inline-flex;}

  .nav{
    position:fixed;
    top:0;
    right:0;
    bottom:0;
    z-index:80;
    display:block;
    width:84vw;
    width:min(330px,88vw);
    padding:96px 18px 40px;
    background:var(--c-paper);
    border-left:1px solid var(--c-line);
    overflow-y:auto;
    transform:translateX(102%);
    visibility:hidden;
    transition:transform var(--dur) var(--ease),visibility var(--dur);
  }
  .site-header[data-open] .nav{
    transform:translateX(0);
    visibility:visible;
  }

  .site-header::after{
    content:"";
    position:fixed;
    inset:0;
    z-index:70;
    background:rgba(11,31,51,.52);
    opacity:0;
    pointer-events:none;
    transition:opacity var(--dur) var(--ease);
  }
  .site-header[data-open]::after{opacity:1;}

  .nav__list{
    display:grid;
    gap:0;
  }
  .nav__link{
    display:flex;
    align-items:center;
    justify-content:flex-start;
    gap:12px;
    padding:16px 6px;
    font-size:17px;
    border-bottom:1px solid var(--c-line);
  }
  .nav__link::before{display:none;}
  .nav__link[aria-current="page"]{
    background:transparent;
    box-shadow:inset 3px 0 0 var(--c-orange);
    padding-left:16px;
  }

  .footer__main{
    grid-template-columns:1fr 1fr;
    gap:34px 30px;
    padding-top:42px;
  }
  .footer__col--brand{grid-column:1 / -1;}
}

@media (max-width:900px){
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr));}
}

@media (max-width:640px){
  :root{--gutter:18px;}

  .brand__name{font-size:17px;}
  .brand__tag{font-size:10px;letter-spacing:.16em;}
  .brand__mark{width:34px;height:34px;}

  .rail__label{display:none;}
  .rail__link{padding:11px 14px;font-size:12.5px;}

  .grid--2,
  .grid--3{grid-template-columns:1fr;}

  .footer__main{grid-template-columns:1fr;}
  .footer__legal-inner{flex-direction:column;align-items:flex-start;}

  .to-top{right:14px;bottom:14px;width:44px;height:44px;}
}

/* ---------- 15. 减少动态偏好 ---------- */
@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;
  }
}