/* ============================================================
   YOBO赛场 · 共享样式表 /assets/site.css
   夜场转播室 + 数据仪表盘 + 极简文字建筑
   ============================================================ */

/* ---------- 1. 设计变量 ---------- */
:root{
  --ink-900:#07130F;
  --ink-800:#0F2A22;
  --paper:#F4F1E8;
  --mist:#E3E7DE;
  --steel:#CBD4C6;
  --cyan:#38F2D0;
  --cyan-soft:rgba(56,242,208,.34);
  --cyan-ghost:rgba(56,242,208,.10);
  --flare:#FF5A2B;
  --flare-deep:#E8461B;
  --amber:#FFC24B;
  --text:#17241F;
  --muted:#5E6F66;
  --line:#1B3A31;
  --hair:rgba(27,58,49,.16);
  --hair-strong:rgba(27,58,49,.3);
  --hair-dark:rgba(244,241,232,.16);
  --paper-72:rgba(244,241,232,.72);
  --paper-52:rgba(244,241,232,.52);

  --wrap:1240px;
  --gutter:20px;
  --header-h:64px;

  --t12:.75rem;
  --t14:.875rem;
  --t16:1rem;
  --t20:1.25rem;
  --t28:1.75rem;
  --t40:2.5rem;
  --t64:4rem;
  --t96:6rem;

  --ease:cubic-bezier(.2,.6,.2,1);
  --dur:.2s;

  --font-head:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Heiti SC",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --font-body:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Heiti SC",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --font-serif:Georgia,"Songti SC","Source Han Serif SC","Noto Serif SC",SimSun,serif;
  --font-mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Courier New",monospace;
}

/* ---------- 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,dl,dd,ul,ol{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:0;cursor:pointer}
:focus-visible{outline:2px solid var(--flare);outline-offset:3px}
::selection{background:var(--cyan);color:var(--ink-900)}

/* ---------- 3. 基础排版 ---------- */
body{
  background:var(--paper);
  color:var(--text);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.75;
  font-variant-numeric:tabular-nums;
  padding-top:var(--header-h);
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
h1,h2,h3,h4{
  font-family:var(--font-head);
  font-weight:900;
  letter-spacing:-.02em;
  line-height:1.15;
  font-stretch:semi-condensed;
  color:inherit;
}
h1{font-size:clamp(28px,5vw,56px)}
h2{font-size:clamp(24px,3.4vw,40px)}
h3{font-size:clamp(19px,2.2px + 1.2vw,24px)}
h3{font-size:clamp(19px,2.4vw,24px)}
h4{font-size:var(--t20);font-weight:800}
strong{font-weight:800}
.mono,[data-mono]{font-family:var(--font-mono);letter-spacing:.04em}

#main-content{display:block;scroll-margin-top:calc(var(--header-h) + 20px)}

/* ---------- 4. 布局骨架 ---------- */
.wrap{
  width:100%;
  max-width:var(--wrap);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.grid{display:grid;gap:24px;grid-template-columns:repeat(4,1fr)}
.grid > *{min-width:0}

.section{padding-block:clamp(56px,8vw,104px);position:relative}
.section--mist{background:var(--mist)}
.section--dark{background:var(--ink-900);color:var(--paper)}
.section--tight{padding-block:clamp(36px,5vw,64px)}
.section__head{
  display:grid;gap:14px;
  padding-bottom:26px;
  margin-bottom:40px;
  border-bottom:1px solid var(--hair);
}
.section--dark .section__head{border-bottom-color:var(--hair-dark)}

.prose{max-width:70ch}
.prose p{max-width:68ch;margin-bottom:1.2em}
.prose p:last-child{margin-bottom:0}
.prose h2,.prose h3{margin:1.8em 0 .6em}
.prose ul{display:grid;gap:10px;margin-bottom:1.2em}
.prose ul li{padding-left:20px;position:relative;max-width:66ch}
.prose ul li::before{content:"";position:absolute;left:0;top:.78em;width:10px;height:1px;background:var(--flare)}

.eyebrow{
  font-family:var(--font-mono);
  font-size:var(--t12);
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--muted);
}
.section--dark .eyebrow{color:var(--cyan)}
.lede{
  font-size:clamp(17px,2vw,20px);
  line-height:1.7;
  color:var(--muted);
  max-width:36em;
}
.section--dark .lede{color:var(--paper-72)}
.rule{height:1px;background:var(--hair);border:0;margin:0}
.section--dark .rule{background:var(--hair-dark)}

.sec-num{
  display:block;
  font-family:var(--font-serif);
  font-weight:400;
  font-size:clamp(44px,7vw,96px);
  line-height:.88;
  letter-spacing:-.02em;
  color:var(--steel);
  font-variant-numeric:tabular-nums;
}
@supports ((-webkit-text-stroke:1px #000)){
  .sec-num{color:transparent;-webkit-text-stroke:1px var(--steel)}
  .sec-num--solid{color:var(--cyan);-webkit-text-stroke:0}
}
.section--dark .sec-num{color:var(--ink-800)}
@supports ((-webkit-text-stroke:1px #000)){
  .section--dark .sec-num{color:transparent;-webkit-text-stroke:1px var(--cyan-soft)}
}

.badge{
  display:inline-flex;align-items:center;gap:6px;
  font-family:var(--font-mono);
  font-size:var(--t12);
  letter-spacing:.06em;
  padding:4px 9px;
  border:1px solid var(--hair-strong);
  color:var(--muted);
  background:transparent;
}
.badge--cyan{border-color:var(--cyan-soft);color:#0E6B58}
.badge--amber{border-color:rgba(255,194,75,.6);color:#7A5500}
.section--dark .badge{border-color:var(--hair-dark);color:var(--paper-72)}
.section--dark .badge--cyan{border-color:var(--cyan-soft);color:var(--cyan)}

/* ---------- 5. 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  font-family:var(--font-head);
  font-weight:800;
  font-size:var(--t14);
  letter-spacing:.02em;
  line-height:1;
  padding:12px 18px;
  border:1px solid transparent;
  border-radius:0;
  background:transparent;
  color:var(--text);
  cursor:pointer;
  transition:background-color var(--dur) var(--ease),color var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.btn--primary{background:var(--flare);border-color:var(--flare);color:#FFF7F3}
.btn--primary:hover{background:var(--flare-deep);border-color:var(--flare-deep);color:#fff}
.btn--ghost{border-color:var(--hair-strong);color:var(--text)}
.btn--ghost:hover{border-color:var(--cyan);color:var(--text);background:var(--cyan-ghost)}
.btn--block{display:flex;width:100%}
.btn--onDark{border-color:var(--hair-dark);color:var(--paper)}
.btn--onDark:hover{border-color:var(--cyan);color:var(--cyan);background:rgba(56,242,208,.08)}

/* ---------- 6. 面包屑 ---------- */
.breadcrumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  padding:16px 0;
  font-family:var(--font-mono);
  font-size:var(--t12);
  letter-spacing:.06em;
  color:var(--muted);
}
.breadcrumb li{display:flex;align-items:center;gap:8px}
.breadcrumb li + li::before{content:"/";color:var(--steel)}
.breadcrumb a{border-bottom:1px solid transparent;transition:border-color var(--dur) var(--ease),color var(--dur) var(--ease)}
.breadcrumb a:hover{color:var(--text);border-bottom-color:var(--cyan)}
.breadcrumb [aria-current="page"]{color:var(--text)}

/* ---------- 7. 页头 ---------- */
.skip-link{
  position:absolute;left:12px;top:-72px;z-index:130;
  padding:10px 16px;
  background:var(--ink-900);
  color:var(--paper);
  border:1px solid var(--cyan);
  font-size:var(--t14);
  transition:top var(--dur) var(--ease);
}
.skip-link:focus{top:12px}

.site-header{
  position:fixed;top:0;left:0;right:0;z-index:90;
  border-bottom:1px solid transparent;
  background:linear-gradient(180deg,rgba(244,241,232,.96) 0%,rgba(244,241,232,.72) 62%,rgba(244,241,232,0) 100%);
  transition:background-color .24s var(--ease),border-color .24s var(--ease);
}
.site-header.is-solid{
  background:var(--ink-900);
  border-bottom-color:var(--line);
}
.header-inner{
  max-width:var(--wrap);
  margin-inline:auto;
  padding-inline:var(--gutter);
  height:var(--header-h);
  display:flex;
  align-items:center;
  gap:16px;
}

/* 品牌 */
.brand{
  position:relative;z-index:3;
  display:flex;align-items:center;gap:10px;
  flex:0 0 auto;
  color:inherit;
}
.brand__mark{
  width:34px;height:34px;flex:0 0 auto;
  display:grid;place-items:center;
  background:var(--ink-900);
  border:1px solid var(--cyan);
  color:var(--cyan);
  font-family:var(--font-head);
  font-weight:900;font-size:16px;line-height:1;
  letter-spacing:-.02em;
}
.brand__text{display:flex;flex-direction:column;gap:1px;min-width:0}
.brand__name{
  font-family:var(--font-head);
  font-weight:900;font-size:17px;line-height:1.15;
  letter-spacing:-.01em;
  white-space:nowrap;
}
.brand__line{
  font-size:11px;line-height:1.2;letter-spacing:.05em;
  color:var(--muted);
  white-space:nowrap;
}
.site-header.is-solid .brand__name{color:var(--paper)}
.site-header.is-solid .brand__line{color:var(--paper-52)}

/* 导航 */
.site-nav{
  flex:1 1 auto;
  min-width:0;
  display:flex;
  align-items:center;
  justify-content:center;
}
.nav-list{
  display:flex;align-items:center;gap:2px;
  counter-reset:navidx;
}
.nav-list li{counter-increment:navidx}
.nav-list a{
  position:relative;
  display:block;
  padding:9px 11px;
  font-size:15px;
  font-weight:500;
  letter-spacing:.01em;
  white-space:nowrap;
  color:var(--text);
  transition:color .16s var(--ease);
}
.nav-list a::after{
  content:"";
  position:absolute;left:11px;right:11px;bottom:3px;height:2px;
  background:var(--cyan);
  transform:scaleX(0);transform-origin:left center;
  transition:transform .18s var(--ease);
}
.nav-list a:hover::after,
.nav-list a[aria-current="page"]::after{transform:scaleX(1)}
.nav-list a[aria-current="page"]{font-weight:800}
.nav-list a::before{display:none;content:counter(navidx,decimal-leading-zero)}
.site-header.is-solid .nav-list a{color:var(--paper-72)}
.site-header.is-solid .nav-list a:hover,
.site-header.is-solid .nav-list a[aria-current="page"]{color:var(--cyan)}

/* 右侧动作区 */
.header-actions{
  position:relative;z-index:3;
  display:flex;align-items:center;gap:10px;
  margin-left:auto;
  flex:0 0 auto;
}

/* 移动菜单按钮 */
.nav-toggle{
  display:none;
  align-items:center;justify-content:center;
  width:44px;height:44px;
  border:1px solid var(--hair-strong);
  color:var(--text);
  background:transparent;
  transition:border-color var(--dur) var(--ease),color var(--dur) var(--ease);
}
.nav-toggle__box{position:relative;display:block;width:20px;height:12px}
.nav-toggle__bar{
  position:absolute;left:0;right:0;height:2px;
  background:currentColor;
  transition:transform .2s var(--ease);
}
.nav-toggle__bar:first-child{top:0}
.nav-toggle__bar:last-child{bottom:0}
[data-nav-toggle][aria-expanded="true"] .nav-toggle__bar:first-child{transform:translateY(5px) rotate(45deg)}
[data-nav-toggle][aria-expanded="true"] .nav-toggle__bar:last-child{transform:translateY(-5px) rotate(-45deg)}

/* 抽屉补充入口（仅小屏可见） */
.nav-foot{display:none}

/* 滚动进度轨道 */
.header-progress{
  position:absolute;left:0;right:0;bottom:-1px;
  height:2px;
  background:transparent;
  overflow:hidden;
}
.header-progress__bar{
  display:block;height:100%;width:0;
  background:var(--cyan);
}

@media (max-width:1279px){
  .nav-list a{padding:9px 8px;font-size:14px}
  .nav-list a::after{left:8px;right:8px}
}

/* ---- 移动 / 平板：整屏抽屉 ---- */
@media (max-width:1080px){
  .nav-toggle{display:inline-flex}
  .header-ghost,
  .header-cta{display:none}

  .site-header[data-open]{
    background:var(--ink-900);
    border-bottom-color:var(--line);
  }
  .site-header[data-open] .brand__name{color:var(--paper)}
  .site-header[data-open] .brand__line{color:var(--paper-52)}
  .site-header[data-open] .nav-toggle{border-color:var(--hair-dark);color:var(--paper)}

  .site-nav{
    position:fixed;inset:0;z-index:2;
    display:block;
    flex:none;
    background:var(--ink-900);
    padding:calc(var(--header-h) + 12px) var(--gutter) 48px;
    overflow-y:auto;
    overscroll-behavior:contain;
    visibility:hidden;
    transform:translateX(100%);
    transition:transform .26s var(--ease),visibility 0s linear .26s;
  }
  .site-header[data-open] .site-nav{
    visibility:visible;
    transform:translateX(0);
    transition:transform .26s var(--ease),visibility 0s linear 0s;
  }
  .nav-list{flex-direction:column;align-items:stretch;gap:0;width:100%}
  .nav-list li{border-bottom:1px solid var(--hair-dark)}
  .nav-list a{
    display:flex;align-items:baseline;
    padding:18px 0;
    font-size:22px;font-weight:800;
    color:var(--paper);
  }
  .nav-list a::after{display:none}
  .nav-list a::before{
    display:inline-block;
    flex:0 0 auto;
    width:2.6em;
    font-family:var(--font-serif);
    font-weight:400;
    font-size:14px;
    letter-spacing:0;
    color:var(--cyan);
  }
  .nav-list a:hover,
  .nav-list a[aria-current="page"]{color:var(--cyan)}
  .nav-foot{display:grid;gap:12px;margin-top:32px}
}

/* ---------- 8. 页脚 ---------- */
.site-footer{
  position:relative;
  background:var(--ink-900);
  color:var(--paper-72);
  border-top:1px solid var(--line);
  padding-top:clamp(48px,6vw,80px);
}
.site-footer::before{
  content:"";
  position:absolute;top:-1px;left:0;right:0;height:2px;
  background:linear-gradient(90deg,
    var(--cyan) 0%,var(--cyan) 20%,
    var(--flare) 20%,var(--flare) 27%,
    var(--line) 27%,var(--line) 100%);
}
.footer-inner{
  display:grid;
  gap:40px 32px;
  grid-template-columns:1fr;
  padding-bottom:clamp(40px,5vw,64px);
}
.footer-brand{max-width:42ch}
.brand--footer{color:var(--paper)}
.brand--footer .brand__mark{background:transparent}
.brand--footer .brand__name{color:var(--paper)}
.brand--footer .brand__line{color:var(--paper-52)}
.footer-tagline{
  margin-top:20px;
  font-size:var(--t14);
  line-height:1.8;
  color:var(--paper-72);
  max-width:36ch;
}
.footer-note{
  margin-top:14px;
  font-size:13px;
  line-height:1.7;
  color:var(--paper-52);
  max-width:40ch;
}
.footer-col__title{
  font-family:var(--font-mono);
  font-size:var(--t12);
  font-weight:600;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--cyan);
  margin-bottom:16px;
}
.footer-list{display:grid;gap:10px}
.footer-list a{
  font-size:15px;
  color:var(--paper-72);
  border-bottom:1px solid transparent;
  transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.footer-list a:hover{color:var(--cyan);border-bottom-color:var(--cyan)}
.footer-contact__list{display:grid;gap:14px}
.footer-contact__item{display:grid;gap:4px}
.footer-contact__label{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--paper-52);
}
.footer-contact__value{
  font-size:15px;
  line-height:1.6;
  color:var(--paper);
  word-break:break-word;
}
.footer-contact__value--mono{
  font-family:var(--font-mono);
  letter-spacing:.04em;
  color:var(--cyan);
}
.footer-base{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:10px 24px;
  padding-block:20px 28px;
  border-top:1px solid var(--hair-dark);
}
.footer-legal{
  font-family:var(--font-mono);
  font-size:var(--t12);
  letter-spacing:.04em;
  color:var(--paper-52);
}

/* ---------- 9. 图片容器 ---------- */
.img-frame{
  position:relative;
  display:block;
  width:100%;
  overflow:hidden;
  background:var(--ink-800);
  border:1px solid var(--line);
}
.img-frame img{
  display:block;
  width:100%;height:100%;
  object-fit:cover;
}
.img-frame--16x9{aspect-ratio:16/9}
.img-frame--3x2{aspect-ratio:3/2}
.img-frame--4x5{aspect-ratio:4/5}
.img-frame--1x1{aspect-ratio:1/1}
.img-frame::after{
  content:"";
  position:absolute;inset:0;
  pointer-events:none;
  background-image:
    linear-gradient(to right,rgba(56,242,208,.12) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(56,242,208,.12) 1px,transparent 1px);
  background-size:48px 48px,48px 48px;
  mix-blend-mode:screen;
}
.img-frame__code{
  position:absolute;left:12px;bottom:10px;z-index:2;
  font-family:var(--font-mono);
  font-size:var(--t12);
  letter-spacing:.08em;
  color:var(--cyan);
  text-shadow:0 1px 2px rgba(7,19,15,.7);
}
.img-frame__tag{
  position:absolute;top:10px;left:12px;z-index:2;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.08em;
  padding:3px 8px;
  background:var(--amber);
  color:var(--ink-900);
}
.img-frame--empty{
  background:
    repeating-linear-gradient(135deg,var(--ink-800) 0 10px,#122f27 10px 20px);
}
.img-frame--empty::before{
  content:"赛场影像";
  position:absolute;inset:0;
  display:grid;place-items:center;
  font-family:var(--font-mono);
  font-size:var(--t12);
  letter-spacing:.2em;
  color:var(--cyan-soft);
}

/* ---------- 10. 章节目录 ---------- */
.toc{
  display:grid;
  gap:2px;
  font-family:var(--font-mono);
  font-size:var(--t12);
  letter-spacing:.06em;
}
.toc a{
  display:flex;
  align-items:baseline;
  gap:10px;
  padding:8px 0;
  color:var(--muted);
  border-left:2px solid transparent;
  padding-left:12px;
  transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.toc a:hover{color:var(--text)}
.toc a[aria-current="true"]{
  color:var(--text);
  border-left-color:var(--cyan);
}
.section--dark .toc a{color:var(--paper-52)}
.section--dark .toc a[aria-current="true"]{color:var(--cyan)}

/* ---------- 11. 显现与返回顶部 ---------- */
.js-reveal [data-reveal]{
  opacity:0;
  transform:translateY(8px);
  transition:opacity .24s var(--ease),transform .24s var(--ease);
}
.js-reveal [data-reveal].is-in{opacity:1;transform:none}

.to-top{
  position:fixed;
  right:max(20px,calc((100vw - var(--wrap)) / 2 - 68px));
  bottom:24px;
  z-index:70;
  width:48px;height:48px;
  display:grid;place-items:center;
  background:var(--ink-900);
  border:1px solid var(--line);
  color:var(--cyan);
  font-family:var(--font-mono);
  font-size:17px;
  line-height:1;
  opacity:0;
  visibility:hidden;
  transform:translateY(8px);
  transition:opacity .2s var(--ease),transform .2s var(--ease),visibility 0s linear .2s,border-color .2s var(--ease);
}
.to-top[data-visible="true"]{
  opacity:1;
  visibility:visible;
  transform:none;
  transition:opacity .2s var(--ease),transform .2s var(--ease),visibility 0s linear 0s,border-color .2s var(--ease);
}
.to-top:hover{border-color:var(--cyan);background:var(--ink-800)}

/* ---------- 12. 断点 ---------- */
@media (min-width:768px){
  :root{--gutter:32px;--header-h:76px}
  .grid{grid-template-columns:repeat(12,1fr)}
  .span-4{grid-column:span 4}
  .span-5{grid-column:span 5}
  .span-6{grid-column:span 6}
  .span-7{grid-column:span 7}
  .span-8{grid-column:span 8}
  .span-12{grid-column:span 12}
  .footer-inner{grid-template-columns:repeat(2,1fr)}
  .footer-brand{grid-column:span 2}
}
@media (min-width:1024px){
  .footer-inner{grid-template-columns:1.6fr 1fr 1fr 1.25fr}
  .footer-brand{grid-column:auto}
}
@media (min-width:1200px){
  :root{--gutter:40px}
}
@media (min-width:1280px){
  .nav-list a{padding:9px 12px;font-size:15px}
  .nav-list a::after{left:12px;right:12px}
}

/* ---------- 13. 降低动效 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  .js-reveal [data-reveal]{opacity:1;transform:none}
  .to-top{transform:none}
}