/* ============================================================
   火狐体育全站 · 共享样式表 /assets/site.css
   设计语言：暖纸底 × 深墨命令栏 × 火焰橙切角
   ============================================================ */

*,*::before,*::after{box-sizing:border-box;}

html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:96px;
}

body,h1,h2,h3,h4,h5,h6,p,figure,blockquote,dl,dd,ul,ol{margin:0;}
ul,ol{padding:0;list-style:none;}
img,svg,video{display:block;max-width:100%;height:auto;}
button,input,select,textarea{font:inherit;color:inherit;}
a{color:inherit;text-decoration:none;}
table{border-collapse:collapse;width:100%;}

/* ---------- 设计变量 ---------- */
:root{
  --paper:#F4EFE7;
  --ink:#1A1A1A;
  --void:#0D0D0F;
  --flame:#FF5A1F;
  --lava:#D7263D;
  --amber:#FFB37A;
  --cyan:#00B4D8;
  --cyan-deep:#0077A8;
  --gray:#6B6B70;
  --rule:#D9D2C7;
  --white:#FDFBF7;

  --font-display:"PingFang SC","Hiragino Sans GB","Source Han Sans SC","Noto Sans SC","Microsoft YaHei",sans-serif;
  --font-editorial:"Songti SC","Source Han Serif SC","Noto Serif SC","STSong",serif;
  --font-body:"PingFang SC","Hiragino Sans GB","Source Han Sans SC","Noto Sans SC","Microsoft YaHei",sans-serif;
  --font-mono:ui-monospace,"SF Mono","JetBrains Mono","Roboto Mono","Menlo","Consolas",monospace;

  --fs-12:0.75rem;
  --fs-14:0.875rem;
  --fs-16:1rem;
  --fs-20:1.25rem;
  --fs-28:1.75rem;
  --fs-40:2.5rem;
  --fs-64:4rem;
  --fs-96:6rem;
  --fs-160:10rem;

  --wrap:1240px;
  --wrap-tight:880px;
  --pad-x:1.25rem;
  --header-h:72px;
}

@media (min-width:768px){
  :root{--pad-x:2rem;}
}

body{
  font-family:var(--font-body);
  font-size:var(--fs-16);
  line-height:1.7;
  color:var(--ink);
  background:var(--paper);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

::selection{background:var(--flame);color:#0D0D0F;}

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

/* ---------- 跳转链接 ---------- */
.skip-link{
  position:fixed;
  left:12px;
  top:-80px;
  z-index:200;
  padding:12px 20px;
  background:var(--flame);
  color:#0D0D0F;
  font-size:var(--fs-14);
  font-weight:800;
  letter-spacing:.04em;
  clip-path:polygon(0 0,100% 0,100% calc(100% - 10px),calc(100% - 10px) 100%,0 100%);
  transition:top .18s ease;
}
.skip-link:focus{top:12px;}

/* ============================================================
   头部 · 紧凑命令栏
   ============================================================ */
.site-header{
  position:sticky;
  top:0;
  z-index:80;
  background:var(--void);
  color:var(--white);
  border-bottom:1px solid rgba(253,251,247,.1);
  transition:box-shadow .22s ease;
}
.site-header::before{
  content:"";
  position:absolute;
  top:0;left:0;right:0;
  height:2px;
  background:linear-gradient(90deg,var(--flame),var(--lava) 42%,var(--amber) 68%,var(--cyan));
}
.site-header[data-scrolled="true"]{
  box-shadow:0 18px 40px -26px rgba(13,13,15,.95);
}

.header-inner{
  position:relative;
  width:min(100% - (var(--pad-x) * 2),1360px);
  margin-inline:auto;
  display:flex;
  align-items:center;
  gap:12px;
  min-height:var(--header-h);
  transition:min-height .22s ease;
}
.site-header[data-scrolled="true"] .header-inner{min-height:54px;}

/* 品牌 */
.brand{
  display:flex;
  align-items:center;
  gap:10px;
  flex:0 0 auto;
  min-height:44px;
  color:var(--white);
}
.brand-mark{
  display:grid;
  place-items:center;
  width:34px;
  height:34px;
  background:linear-gradient(135deg,var(--flame),var(--lava));
  color:#0D0D0F;
  font-family:var(--font-display);
  font-size:18px;
  font-weight:900;
  line-height:1;
  clip-path:polygon(0 0,100% 0,100% 68%,68% 100%,0 100%);
  transition:width .22s ease,height .22s ease,font-size .22s ease;
}
.site-header[data-scrolled="true"] .brand-mark{width:28px;height:28px;font-size:15px;}
.brand-text{display:flex;flex-direction:column;line-height:1.15;}
.brand-name{
  font-family:var(--font-display);
  font-size:var(--fs-16);
  font-weight:900;
  letter-spacing:.02em;
}
.brand-tag{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.12em;
  color:var(--cyan);
  white-space:nowrap;
}

/* 导航 */
.nav{
  flex:1 1 auto;
  min-width:0;
  display:flex;
  justify-content:flex-end;
}
.nav-list{
  display:flex;
  align-items:center;
  gap:2px;
}
.nav-item{display:block;}
.nav-link{
  position:relative;
  display:inline-flex;
  align-items:center;
  gap:6px;
  height:44px;
  padding:0 12px;
  font-size:var(--fs-14);
  font-weight:600;
  color:rgba(253,251,247,.7);
  transition:color .18s ease;
}
.nav-idx{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.06em;
  color:var(--gray);
  transition:color .18s ease;
}
.nav-label{white-space:nowrap;}
.nav-link:hover{color:var(--white);}
.nav-link:hover .nav-idx{color:var(--amber);}
.nav-link[aria-current="page"]{color:var(--white);}
.nav-link[aria-current="page"] .nav-idx{color:var(--flame);}
.nav-link[aria-current="page"]::after{
  content:"";
  position:absolute;
  left:12px;right:12px;bottom:4px;
  height:2px;
  background:var(--flame);
}

/* 头部动作区 */
.header-actions{
  flex:0 0 auto;
  display:flex;
  align-items:center;
  gap:10px;
}

/* ============================================================
   按钮系统
   ============================================================ */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  min-height:44px;
  padding:0 22px;
  border:1px solid transparent;
  background:transparent;
  font-family:var(--font-body);
  font-size:var(--fs-16);
  font-weight:800;
  letter-spacing:.02em;
  cursor:pointer;
  clip-path:polygon(0 0,100% 0,100% calc(100% - 10px),calc(100% - 10px) 100%,0 100%);
  transition:background-color .18s ease,color .18s ease,border-color .18s ease;
}
.btn:focus-visible{outline:none;box-shadow:inset 0 0 0 2px var(--cyan);}
.btn-sm{min-height:40px;padding:0 16px;font-size:var(--fs-14);}

.btn-flame{background:var(--flame);color:#0D0D0F;}
.btn-flame:hover{background:var(--amber);}

.btn-outline{border-color:var(--rule);color:var(--ink);}
.btn-outline:hover{border-color:var(--flame);color:var(--flame);}

.btn-ghost{border-color:rgba(253,251,247,.28);color:var(--white);}
.btn-ghost:hover{border-color:var(--flame);color:var(--flame);}

/* 移动菜单开关 */
.nav-toggle{
  display:inline-flex;
  align-items:center;
  gap:8px;
  min-height:44px;
  padding:0 12px;
  background:transparent;
  border:1px solid rgba(253,251,247,.26);
  color:var(--white);
  cursor:pointer;
  font-size:var(--fs-12);
  font-weight:700;
  letter-spacing:.1em;
}
.nav-toggle-box{
  display:inline-flex;
  flex-direction:column;
  gap:5px;
  width:18px;
}
.nav-toggle-bar{
  display:block;
  height:2px;
  background:currentColor;
  transition:transform .2s ease,opacity .2s ease;
}
.site-header[data-open="true"] .nav-toggle-bar:nth-child(1){transform:translateY(3.5px) rotate(45deg);}
.site-header[data-open="true"] .nav-toggle-bar:nth-child(2){transform:translateY(-3.5px) rotate(-45deg);}
.nav-toggle-text{white-space:nowrap;}

/* 阅读进度条 */
.read-progress{
  position:absolute;
  left:0;bottom:0;
  width:100%;
  height:2px;
  transform:scaleX(0);
  transform-origin:0 50%;
  background:linear-gradient(90deg,var(--flame),var(--lava) 55%,var(--cyan));
  z-index:2;
  pointer-events:none;
}

/* ---------- 移动端导航抽屉 ---------- */
@media (max-width:1023px){
  .nav{
    position:absolute;
    top:100%;
    left:0;
    right:0;
    display:block;
    margin:0;
    padding:8px 0 18px;
    background:var(--void);
    border-top:1px solid rgba(253,251,247,.12);
    box-shadow:0 30px 50px -30px rgba(0,0,0,.9);
    max-height:calc(100vh - 100%);
    overflow-y:auto;
    opacity:0;
    visibility:hidden;
    pointer-events:none;
    transform:translateY(-8px);
    transition:opacity .2s ease,transform .2s ease,visibility .2s ease;
  }
  .site-header[data-open="true"] .nav{
    opacity:1;
    visibility:visible;
    pointer-events:auto;
    transform:none;
  }
  .nav-list{
    flex-direction:column;
    align-items:stretch;
    gap:0;
    padding:0 var(--pad-x);
  }
  .nav-link{
    width:100%;
    height:auto;
    min-height:50px;
    padding:0 4px;
    font-size:var(--fs-16);
    border-bottom:1px solid rgba(253,251,247,.08);
  }
  .nav-link[aria-current="page"]::after{display:none;}
  .nav-link[aria-current="page"]{
    background:linear-gradient(90deg,rgba(255,90,31,.18),transparent 72%);
    box-shadow:inset 3px 0 0 var(--flame);
    padding-left:14px;
  }
}

@media (min-width:1024px){
  .nav-toggle{display:none;}
}

@media (max-width:430px){
  .header-cta{padding:0 11px;font-size:var(--fs-12);}
  .nav-toggle-text{display:none;}
  .brand-tag{display:none;}
}

/* ============================================================
   页脚
   ============================================================ */
.site-footer{
  position:relative;
  background:var(--void);
  color:rgba(253,251,247,.72);
}
.footer-slash{
  height:34px;
  background:linear-gradient(90deg,var(--flame),var(--lava) 55%,var(--cyan));
  clip-path:polygon(0 100%,100% 0,100% 100%);
}
.footer-inner{
  width:min(100% - (var(--pad-x) * 2),var(--wrap));
  margin-inline:auto;
  padding:56px 0 26px;
}
.footer-grid{
  display:grid;
  gap:40px;
}
@media (min-width:820px){
  .footer-grid{
    grid-template-columns:minmax(0,1.5fr) minmax(0,1fr) minmax(0,1.25fr);
    gap:56px;
  }
}
@media (min-width:1160px){
  .footer-grid{gap:80px;}
}

.footer-brand{
  font-family:var(--font-display);
  font-size:var(--fs-28);
  font-weight:900;
  line-height:1;
  color:var(--white);
  letter-spacing:.01em;
}
.footer-desc{
  margin:16px 0 22px;
  max-width:34em;
  font-size:var(--fs-14);
  line-height:1.75;
  color:rgba(253,251,247,.62);
}
.footer-head{
  position:relative;
  padding-top:14px;
  margin-bottom:18px;
  font-family:var(--font-mono);
  font-size:var(--fs-12);
  font-weight:700;
  letter-spacing:.18em;
  color:var(--amber);
}
.footer-head::before{
  content:"";
  position:absolute;
  top:0;left:0;
  width:26px;height:2px;
  background:var(--flame);
}
.footer-list{display:grid;gap:2px;}
.footer-list a{
  display:inline-flex;
  align-items:center;
  min-height:38px;
  font-size:var(--fs-14);
  color:rgba(253,251,247,.72);
  transition:color .18s ease,transform .18s ease;
}
.footer-list a:hover{color:var(--flame);transform:translateX(3px);}

.footer-list-info{gap:10px;}
.footer-list-info li{
  display:grid;
  grid-template-columns:5.2em minmax(0,1fr);
  gap:12px;
  align-items:baseline;
  font-size:var(--fs-14);
}
.footer-key{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.08em;
  color:var(--gray);
}
.footer-val{color:rgba(253,251,247,.82);word-break:break-word;}

.footer-base{
  margin-top:48px;
  padding-top:20px;
  border-top:1px solid rgba(253,251,247,.12);
  display:flex;
  flex-wrap:wrap;
  gap:14px 28px;
  align-items:center;
  justify-content:space-between;
}
.footer-legal{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:10px;
  font-size:var(--fs-14);
}
.footer-legal a{color:rgba(253,251,247,.66);transition:color .18s ease;}
.footer-legal a:hover{color:var(--flame);}
.footer-dot{color:var(--gray);}
.footer-meta{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.06em;
  color:var(--gray);
}

/* ============================================================
   通用布局
   ============================================================ */
.wrap{
  width:min(100% - (var(--pad-x) * 2),var(--wrap));
  margin-inline:auto;
}
.wrap-tight{
  width:min(100% - (var(--pad-x) * 2),var(--wrap-tight));
  margin-inline:auto;
}

.section{padding-block:clamp(52px,7vw,104px);}
.section-paper{background:var(--paper);color:var(--ink);}
.section-white{background:var(--white);color:var(--ink);}
.section-dark{background:var(--ink);color:var(--white);}
.section-void{background:var(--void);color:var(--white);}
.section-flame{background:var(--flame);color:#0D0D0F;}

.stack{display:flex;flex-direction:column;gap:clamp(16px,2.4vw,32px);}
.stack-tight{display:flex;flex-direction:column;gap:10px;}
.cluster{display:flex;flex-wrap:wrap;gap:12px;align-items:center;}

.rule{
  height:1px;
  border:0;
  background:var(--rule);
}
.section-dark .rule,.section-void .rule{background:rgba(253,251,247,.16);}

/* ============================================================
   排版组件
   ============================================================ */
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-family:var(--font-mono);
  font-size:var(--fs-12);
  font-weight:700;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--flame);
}
.eyebrow::before{
  content:"";
  width:26px;
  height:2px;
  background:currentColor;
  flex:0 0 auto;
}

.display{
  font-family:var(--font-display);
  font-weight:900;
  font-size:clamp(3rem,11vw,10rem);
  line-height:.9;
  letter-spacing:-.03em;
}
.display-md{
  font-family:var(--font-display);
  font-weight:900;
  font-size:clamp(2.125rem,5.6vw,4rem);
  line-height:1;
  letter-spacing:-.02em;
}

.lede{
  font-size:clamp(1.0625rem,1.4vw,1.25rem);
  line-height:1.72;
  max-width:38ch;
  color:var(--gray);
}
.section-dark .lede,.section-void .lede{color:rgba(253,251,247,.68);}
.section-flame .lede{color:rgba(13,13,15,.78);}

.prose{max-width:36em;}
.prose p + p{margin-top:1.1em;}
.prose h2{
  font-family:var(--font-editorial);
  font-weight:600;
  font-size:var(--fs-28);
  margin-top:1.6em;
  margin-bottom:.6em;
}
.prose h3{
  font-family:var(--font-body);
  font-weight:800;
  font-size:var(--fs-20);
  margin-top:1.4em;
  margin-bottom:.5em;
}
.prose a{
  color:var(--cyan-deep);
  text-decoration:underline;
  text-underline-offset:3px;
}
.prose a:hover{color:var(--flame);}
.section-dark .prose a,.section-void .prose a{color:var(--cyan);}

/* 编号章节 */
.chapter{
  display:flex;
  align-items:baseline;
  gap:clamp(12px,2vw,22px);
  padding-bottom:14px;
  border-bottom:2px solid var(--rule);
  transition:border-color .3s ease;
}
.section-dark .chapter,.section-void .chapter{border-color:rgba(253,251,247,.16);}
.chapter[data-active="true"]{border-color:var(--flame);}
.chapter-num{
  font-family:var(--font-mono);
  font-size:clamp(1.75rem,3.6vw,2.5rem);
  font-weight:700;
  line-height:1;
  color:var(--flame);
  flex:0 0 auto;
}
.chapter-title{
  font-family:var(--font-editorial);
  font-weight:600;
  font-size:clamp(1.375rem,2.6vw,1.75rem);
  line-height:1.25;
}

/* ============================================================
   网格与卡片
   ============================================================ */
.grid{display:grid;gap:clamp(16px,2vw,28px);}
.grid-2{grid-template-columns:minmax(0,1fr);}
.grid-3{grid-template-columns:minmax(0,1fr);}
.grid-7-3{grid-template-columns:minmax(0,1fr);}

@media (min-width:700px){
  .grid-2{grid-template-columns:repeat(2,minmax(0,1fr));}
  .grid-3{grid-template-columns:repeat(2,minmax(0,1fr));}
}
@media (min-width:1000px){
  .grid-3{grid-template-columns:repeat(3,minmax(0,1fr));}
  .grid-7-3{grid-template-columns:minmax(0,7fr) minmax(0,3fr);gap:clamp(24px,3.4vw,48px);align-items:start;}
}

.card{
  position:relative;
  background:var(--white);
  border:1px solid var(--rule);
  padding:clamp(20px,2.6vw,32px);
  transition:border-color .2s ease,box-shadow .2s ease;
}
.card:hover{
  border-color:var(--flame);
  box-shadow:0 22px 44px -34px rgba(26,26,26,.6);
}
.section-dark .card,.section-void .card{
  background:rgba(253,251,247,.04);
  border-color:rgba(253,251,247,.14);
  color:var(--white);
}
.section-dark .card:hover,.section-void .card:hover{border-color:var(--flame);}

.panel-cut{
  position:relative;
  background:var(--ink);
  color:var(--white);
  padding:clamp(22px,3vw,38px);
  clip-path:polygon(0 0,calc(100% - 26px) 0,100% 26px,100% 100%,0 100%);
}
.panel-cut-flame{background:var(--flame);color:#0D0D0F;}

.tag{
  display:inline-flex;
  align-items:center;
  min-height:28px;
  padding:0 10px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  color:var(--flame);
  border:1px solid currentColor;
}
.section-dark .tag,.section-void .tag{color:var(--amber);}

/* 数据统计 */
.stat{
  border-top:2px solid var(--flame);
  padding-top:14px;
}
.stat-value{
  font-family:var(--font-mono);
  font-size:clamp(1.75rem,4vw,2.5rem);
  font-weight:700;
  line-height:1;
  letter-spacing:-.02em;
  font-variant-numeric:tabular-nums;
}
.stat-label{
  margin-top:10px;
  font-size:var(--fs-12);
  letter-spacing:.14em;
  color:var(--gray);
}
.section-dark .stat-label,.section-void .stat-label{color:rgba(253,251,247,.6);}

/* ============================================================
   技能树式服务路径
   ============================================================ */
.path{display:grid;gap:0;}
.path-step{
  display:grid;
  grid-template-columns:auto minmax(0,1fr);
  column-gap:clamp(16px,2.4vw,28px);
  row-gap:6px;
  padding:22px 0;
  border-top:1px solid var(--rule);
}
.section-dark .path-step,.section-void .path-step{border-color:rgba(253,251,247,.16);}
.path-step::before{
  content:attr(data-step);
  grid-column:1;
  grid-row:1 / span 2;
  font-family:var(--font-mono);
  font-size:clamp(1.25rem,2.4vw,1.75rem);
  font-weight:700;
  line-height:1.1;
  color:var(--flame);
}
.path-step-title{
  grid-column:2;
  grid-row:1;
  margin:0;
  font-family:var(--font-editorial);
  font-weight:600;
  font-size:var(--fs-20);
  line-height:1.3;
}
.path-step-text{
  grid-column:2;
  grid-row:2;
  margin:0;
  font-size:var(--fs-14);
  line-height:1.7;
  color:var(--gray);
}
.section-dark .path-step-text,.section-void .path-step-text{color:rgba(253,251,247,.64);}

/* ============================================================
   图片容器（页面阶段放置 <img>）
   ============================================================ */
.media{
  position:relative;
  display:block;
  overflow:hidden;
  background:var(--ink);
  width:100%;
}
.media > img{
  width:100%;
  height:100%;
  object-fit:cover;
  object-position:center;
}
.media::after{
  content:"";
  position:absolute;
  inset:0;
  background:linear-gradient(158deg,rgba(255,90,31,.2),transparent 58%);
  pointer-events:none;
}
.media-16x9{aspect-ratio:16 / 9;}
.media-4x3{aspect-ratio:4 / 3;}
.media-1x1{aspect-ratio:1 / 1;}
.media-wide{aspect-ratio:21 / 9;}

@media (max-width:560px){
  .media-wide{aspect-ratio:16 / 9;}
}

/* ============================================================
   面包屑
   ============================================================ */
.breadcrumb{
  font-family:var(--font-mono);
  font-size:var(--fs-12);
  letter-spacing:.08em;
  color:var(--gray);
}
.breadcrumb ol{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
}
.breadcrumb li{display:inline-flex;align-items:center;gap:8px;}
.breadcrumb li + li::before{
  content:"/";
  color:var(--rule);
}
.breadcrumb a{color:var(--gray);transition:color .18s ease;}
.breadcrumb a:hover{color:var(--flame);}
.section-dark .breadcrumb,.section-void .breadcrumb,
.section-dark .breadcrumb a,.section-void .breadcrumb a{color:rgba(253,251,247,.6);}
.section-dark .breadcrumb a:hover,.section-void .breadcrumb a:hover{color:var(--flame);}

/* ============================================================
   滚动显现
   ============================================================ */
html[data-reveal-ready="true"] [data-reveal]{
  opacity:0;
  transform:translateY(14px);
  transition:opacity .45s ease,transform .45s ease;
  transition-delay:40ms;
}
html[data-reveal-ready="true"] [data-reveal][data-visible="true"]{
  opacity:1;
  transform:none;
}

/* ============================================================
   降级动效
   ============================================================ */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto;scroll-padding-top:80px;}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  html[data-reveal-ready="true"] [data-reveal]{
    opacity:1 !important;
    transform:none !important;
  }
  .read-progress{transition:none;}
}