/* ============================================================
   易倍赛场 · /assets/site.css
   共享外壳层：reset / 变量 / 中文排版 / 头部 / 页脚 / 通用组件
   底色 ink-900 · 刻度 cyan-400 · 时间 signal-orange
   ============================================================ */

:root{
  --ink-900:#0B1F1A;
  --ink-800:#102A22;
  --ink-700:#16382E;
  --line-500:#2A4A3E;
  --cyan-400:#3DF2C0;
  --cyan-200:#9BF6DC;
  --orange:#FF7A1A;
  --paper:#F2F5EE;
  --text:#E8F3EE;
  --muted:#8FA9A0;

  --rail:88px;
  --topbar-h:76px;
  --gutter:24px;
  --maxw:1440px;
  --ease:cubic-bezier(.2,.7,.3,1);

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

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:calc(var(--topbar-h) + 16px);
}
body,h1,h2,h3,h4,h5,p,ul,ol,figure,blockquote,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video{display:block;max-width:100%}
a{color:inherit}
button{font:inherit;color:inherit}
table{border-collapse:collapse}

/* ---------- base ---------- */
body{
  min-height:100vh;
  background-color:var(--ink-900);
  background-image:
    linear-gradient(rgba(42,74,62,.30) 1px,transparent 1px),
    linear-gradient(90deg,rgba(42,74,62,.30) 1px,transparent 1px),
    repeating-linear-gradient(45deg,rgba(61,242,192,.022) 0 1px,transparent 1px 14px);
  background-size:64px 64px,64px 64px,auto;
  background-position:-1px -1px,-1px -1px,0 0;
  color:var(--text);
  font-family:var(--font-sans);
  font-size:16px;
  font-weight:400;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
}
body.is-locked{overflow:hidden}

h1,h2,h3,h4{font-weight:800;line-height:1.1;letter-spacing:-.015em}
p{max-width:38em}

:focus-visible{outline:2px solid var(--cyan-400);outline-offset:3px}

::selection{background:var(--cyan-400);color:var(--ink-900)}

/* ---------- utilities ---------- */
.container{
  width:100%;
  max-width:var(--maxw);
  margin-inline:auto;
  padding-inline:clamp(18px,3.2vw,56px);
}
#main-content{padding-top:var(--topbar-h)}
.sr-only{
  position:absolute;width:1px;height:1px;padding:0;margin:-1px;
  overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0;
}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.02em}
.num-time{font-family:var(--font-mono);font-variant-numeric:tabular-nums;color:var(--orange);letter-spacing:.02em}
.eyebrow{
  font-family:var(--font-mono);
  font-size:11px;letter-spacing:.24em;text-transform:uppercase;
  color:var(--muted);
}
.lede{font-size:clamp(16px,1.3vw,17.5px);color:var(--cyan-200);max-width:34em;line-height:1.8}
.annotation{
  writing-mode:vertical-rl;text-orientation:mixed;
  font-size:11px;letter-spacing:.2em;color:var(--muted);
  font-family:var(--font-mono);
}
.tag{
  display:inline-block;padding:2px 8px;
  border:1px solid var(--line-500);
  font-family:var(--font-mono);font-size:10px;letter-spacing:.16em;
  color:var(--muted);text-transform:uppercase;
}

/* ---------- grid ---------- */
.grid{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:var(--gutter)}
.span-2{grid-column:span 2}
.span-3{grid-column:span 3}
.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-9{grid-column:span 9}
.span-10{grid-column:span 10}
.span-12{grid-column:span 12}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  padding:11px 20px;
  border:1px solid var(--line-500);
  border-radius:0;
  background:transparent;
  color:var(--text);
  font-size:13px;font-weight:500;letter-spacing:.08em;
  text-decoration:none;cursor:pointer;
  transition:background-color .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease);
}
.btn:hover{border-color:var(--cyan-200);color:var(--cyan-200)}
.btn--primary{border-color:var(--cyan-400);color:var(--cyan-400)}
.btn--primary:hover{background:var(--cyan-400);color:var(--ink-900);border-color:var(--cyan-400)}
.btn--ghost{border-color:var(--line-500);color:var(--muted)}
.btn--ghost:hover{color:var(--text);border-color:var(--text)}
.btn--sm{padding:8px 14px;font-size:12px;letter-spacing:.06em}

/* ---------- chips ---------- */
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chip{
  padding:6px 12px;
  border:1px solid var(--line-500);
  background:transparent;
  color:var(--muted);
  font-size:12px;letter-spacing:.06em;
  border-radius:0;cursor:pointer;
  transition:color .16s var(--ease),border-color .16s var(--ease),background-color .16s var(--ease);
}
.chip:hover{color:var(--text);border-color:var(--cyan-200)}
.chip.is-active,.chip[aria-pressed="true"]{
  border-color:var(--cyan-400);
  background:var(--cyan-400);
  color:var(--ink-900);
}

/* ---------- skip link ---------- */
.skip-link{
  position:fixed;top:10px;left:12px;z-index:120;
  padding:10px 18px;
  background:var(--cyan-400);color:var(--ink-900);
  font-size:13px;font-weight:700;letter-spacing:.04em;
  text-decoration:none;border-radius:0;
  transform:translateY(-180%);
  transition:transform .18s var(--ease);
}
.skip-link:focus-visible,.skip-link:focus{transform:translateY(0)}

/* ============================================================
   头部
   ============================================================ */
.site-header{position:fixed;inset:0 0 auto 0;z-index:90}

/* ---- 左侧品牌轨道 ---- */
.site-rail{
  position:fixed;left:0;top:0;bottom:0;width:var(--rail);z-index:92;
  display:flex;flex-direction:column;align-items:center;
  gap:14px;padding:20px 0 18px;
  background:var(--ink-800);
  border-right:1px solid var(--line-500);
}
.rail__brand{
  display:flex;flex-direction:column;align-items:center;gap:10px;
  text-decoration:none;color:var(--text);
}
.rail__mark{
  width:34px;height:34px;
  display:grid;place-items:center;
  border:1px solid var(--cyan-400);
  color:var(--cyan-400);
  font-family:var(--font-mono);font-size:15px;line-height:1;
  transition:background-color .18s var(--ease),color .18s var(--ease);
}
.rail__brand:hover .rail__mark{background:var(--cyan-400);color:var(--ink-900)}
.rail__word{
  writing-mode:vertical-rl;text-orientation:mixed;
  font-size:12px;letter-spacing:.3em;line-height:1;
  color:var(--text);
}
.rail__nav{
  flex:1 1 auto;width:100%;
  overflow-y:auto;
  scrollbar-width:none;
  padding-block:6px;
}
.rail__nav::-webkit-scrollbar{display:none}
.rail__list{display:flex;flex-direction:column;align-items:stretch;gap:0}
.rail__item{width:100%}
.rail__link{
  position:relative;
  display:grid;grid-template-columns:auto auto;
  justify-content:center;align-items:start;gap:6px;
  padding:9px 4px;
  color:var(--muted);text-decoration:none;
  transition:color .16s var(--ease);
}
.rail__link::before{
  content:"";position:absolute;left:0;top:8px;bottom:8px;width:2px;
  background:var(--cyan-400);
  transform:scaleY(0);transform-origin:50% 0;
  transition:transform .16s var(--ease);
}
.rail__link:hover{color:var(--cyan-200)}
.rail__link[aria-current="page"]{color:var(--cyan-400)}
.rail__link[aria-current="page"]::before{transform:scaleY(1)}
.rail__num{
  font-family:var(--font-mono);font-size:10px;letter-spacing:.1em;
  opacity:.75;padding-top:2px;line-height:1;
}
.rail__label{
  writing-mode:vertical-rl;text-orientation:mixed;
  font-size:12px;line-height:1;letter-spacing:.14em;
  transition:letter-spacing .16s var(--ease);
}
.rail__link:hover .rail__label{letter-spacing:.2em}
.rail__status{
  display:flex;flex-direction:column;align-items:center;gap:6px;
  font-family:var(--font-mono);font-size:10px;letter-spacing:.12em;
  color:var(--muted);text-align:center;line-height:1.5;
  max-width:100%;padding-inline:6px;
}
.rail__dot{
  width:6px;height:6px;background:var(--cyan-400);
  box-shadow:0 0 0 3px rgba(61,242,192,.16);
}

/* ---- 顶部阅读条 ---- */
.site-topbar{
  position:relative;
  height:var(--topbar-h);
  margin-left:var(--rail);
  display:flex;align-items:center;justify-content:space-between;gap:20px;
  padding-inline:clamp(18px,2.4vw,40px);
  background:linear-gradient(180deg,rgba(11,31,26,.86),rgba(11,31,26,0));
  border-bottom:1px solid transparent;
  transition:background-color .24s var(--ease),border-color .24s var(--ease);
}
.site-header[data-scrolled="true"] .site-topbar{
  background-color:var(--ink-800);
  background-image:none;
  border-bottom-color:var(--line-500);
}
.topbar__brand{
  display:none;align-items:center;gap:8px;
  font-size:15px;font-weight:800;letter-spacing:.08em;
  color:var(--text);text-decoration:none;white-space:nowrap;
}
.topbar__brand::before{
  content:"";width:8px;height:8px;background:var(--cyan-400);flex:none;
}
.topbar__nav{flex:1 1 auto;display:flex;justify-content:flex-end}
.topbar__list{display:flex;align-items:center;gap:clamp(12px,1.5vw,26px)}
.topbar__link{
  position:relative;display:inline-block;
  padding:4px 0;
  font-size:13.5px;letter-spacing:.05em;white-space:nowrap;
  color:var(--muted);text-decoration:none;
  transition:color .16s var(--ease);
}
.topbar__link::after{
  content:"";position:absolute;left:0;bottom:0;height:1px;width:0;
  background:var(--cyan-400);
  transition:width .16s var(--ease);
}
.topbar__link:hover{color:var(--text)}
.topbar__link:hover::after{width:100%}
.topbar__link[aria-current="page"]{color:var(--cyan-400)}
.topbar__link[aria-current="page"]::after{width:100%;opacity:.5}
.topbar__actions{display:flex;align-items:center;gap:12px;flex:none}
.topbar__cta{white-space:nowrap}

/* 进度刻度 */
.site-progress{
  position:absolute;left:0;right:0;bottom:-1px;height:2px;
  overflow:hidden;pointer-events:none;
}
.site-progress__bar{
  display:block;height:100%;width:100%;
  background:var(--cyan-400);
  transform:scaleX(0);transform-origin:0 50%;
  transition:transform .12s linear;
}

/* ---- 移动目录按钮 ---- */
.nav-toggle{
  display:none;align-items:center;gap:9px;
  height:40px;padding:0 12px;
  border:1px solid var(--line-500);
  background:transparent;color:var(--text);
  font-size:12px;letter-spacing:.14em;
  border-radius:0;cursor:pointer;
  transition:border-color .16s var(--ease),color .16s var(--ease);
}
.nav-toggle:hover{border-color:var(--cyan-200);color:var(--cyan-200)}
.nav-toggle__bars{position:relative;display:block;width:16px;height:9px;flex:none}
.nav-toggle__bars::before,
.nav-toggle__bars::after{
  content:"";position:absolute;left:0;right:0;height:1px;
  background:var(--cyan-400);
  transition:transform .18s var(--ease);
}
.nav-toggle__bars::before{top:0}
.nav-toggle__bars::after{bottom:0}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before{transform:translateY(4px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{transform:translateY(-4px) rotate(-45deg)}

/* ---- 移动抽屉 ---- */
.site-drawer{display:none}
.site-drawer[data-open="false"]{pointer-events:none}

@media (max-width:1023px){
  :root{--topbar-h:56px;--rail:0px}
  body{padding-left:0}
  .site-rail{display:none}
  .site-topbar{margin-left:0}
  .topbar__brand{display:inline-flex}
  .topbar__nav{display:none}
  .nav-toggle{display:inline-flex}

  .site-drawer{
    position:fixed;left:0;right:0;top:var(--topbar-h);bottom:0;z-index:88;
    display:flex;flex-direction:column;gap:22px;
    padding:24px clamp(18px,4vw,32px) 40px;
    background:var(--ink-800);
    border-top:1px solid var(--line-500);
    overflow-y:auto;
    opacity:0;visibility:hidden;
    transform:translateY(-10px);
    transition:opacity .2s var(--ease),transform .2s var(--ease),visibility .2s var(--ease);
  }
  .site-drawer[data-open="true"]{
    opacity:1;visibility:visible;transform:none;pointer-events:auto;
  }
  .drawer__list{display:flex;flex-direction:column}
  .drawer__link{
    display:flex;align-items:baseline;gap:14px;
    padding:15px 0;
    border-bottom:1px solid var(--line-500);
    color:var(--text);text-decoration:none;
    font-size:17px;font-weight:500;letter-spacing:.02em;
    transition:color .16s var(--ease);
  }
  .drawer__link:hover{color:var(--cyan-200)}
  .drawer__num{
    font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;
    color:var(--muted);
  }
  .drawer__link[aria-current="page"]{color:var(--cyan-400)}
  .drawer__link[aria-current="page"] .drawer__num{color:var(--cyan-400)}
  .drawer__cta{align-self:flex-start}
  .drawer__meta{
    font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;
    color:var(--muted);
  }
}

@media (min-width:1024px){
  body{padding-left:var(--rail)}
  .skip-link{left:calc(var(--rail) + 12px)}
  .topbar__brand{display:none}
}
@media (max-width:719px){
  .topbar__cta{display:none}
}

/* ============================================================
   页脚
   ============================================================ */
.site-footer{
  position:relative;
  background:var(--ink-800);
  border-top:1px solid var(--line-500);
}
.footer__grid{
  display:grid;
  grid-template-columns:1.5fr 1fr 1.3fr 1fr;
  gap:clamp(24px,3vw,48px);
  padding-block:clamp(40px,5vw,64px) clamp(28px,3vw,40px);
}
.footer__col{min-width:0}
.footer__brand{
  display:inline-block;
  font-size:20px;font-weight:800;letter-spacing:.06em;
  color:var(--text);text-decoration:none;
}
.footer__tagline{
  margin-top:12px;
  font-size:14px;line-height:1.8;color:var(--muted);
  max-width:22em;
}
.footer__note{
  margin-top:12px;
  font-size:12px;line-height:1.7;color:var(--muted);opacity:.8;
  max-width:24em;
}
.footer__title{
  font-family:var(--font-mono);
  font-size:11px;font-weight:500;letter-spacing:.24em;
  text-transform:uppercase;color:var(--muted);
  margin-bottom:14px;
}
.footer__list{display:flex;flex-direction:column;gap:9px}
.footer__link{
  display:inline-block;width:fit-content;
  padding-bottom:2px;
  font-size:14px;line-height:1.7;color:var(--muted);text-decoration:none;
  background-image:linear-gradient(currentColor,currentColor);
  background-repeat:no-repeat;
  background-size:0 1px;
  background-position:0 100%;
  transition:background-size .18s var(--ease),color .18s var(--ease);
}
.footer__link:hover{color:var(--text);background-size:100% 1px}
.footer__text{font-size:14px;line-height:1.7;color:var(--muted);word-break:break-word}
.footer__legal{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:10px 24px;
  padding-block:18px;
  border-top:1px solid var(--line-500);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;color:var(--muted);
}
.footer__legal-line,.footer__copy{margin:0}

/* ============================================================
   通用内容组件
   ============================================================ */
.section{
  position:relative;
  padding-block:clamp(48px,7vw,96px);
}
.section+.section{border-top:1px solid var(--line-500)}
.section__head{
  display:grid;grid-template-columns:auto minmax(0,1fr);
  gap:clamp(16px,2.4vw,32px);align-items:start;
  margin-bottom:clamp(24px,3vw,40px);
}
.section__index{
  font-family:var(--font-mono);font-variant-numeric:tabular-nums;
  font-size:clamp(40px,6vw,76px);line-height:.9;
  color:var(--cyan-400);letter-spacing:-.02em;
}
.section__title{
  font-size:clamp(26px,3.4vw,44px);
  line-height:1.05;letter-spacing:-.02em;
  color:var(--text);
}
.tick-rule{
  position:relative;height:10px;
  border-top:1px solid var(--line-500);
}
.tick-rule::before{
  content:"";position:absolute;left:0;right:0;top:0;height:4px;
  background-image:repeating-linear-gradient(90deg,var(--line-500) 0 1px,transparent 1px 16px);
}
.panel{
  background:var(--ink-700);
  border:1px solid var(--line-500);
  padding:clamp(16px,2vw,22px);
}

/* 图片容器基座（页面阶段放图） */
.figure{
  position:relative;margin:0;
  background:var(--ink-700);
  border:1px solid var(--line-500);
  overflow:hidden;
  clip-path:polygon(0 0,100% 0,100% calc(100% - 18px),calc(100% - 18px) 100%,0 100%);
}
.figure__img{
  display:block;width:100%;height:100%;
  aspect-ratio:16/10;object-fit:cover;
  filter:brightness(.88) saturate(1.05);
}
.figure::before,.figure::after{
  content:"";position:absolute;width:22px;height:22px;pointer-events:none;
  border-color:var(--cyan-400);border-style:solid;border-width:0;
}
.figure::before{top:0;left:0;border-top-width:1px;border-left-width:1px}
.figure::after{bottom:0;right:0;border-bottom-width:1px;border-right-width:1px}
.figure__ph{
  position:relative;
  aspect-ratio:16/10;
  display:grid;place-items:center;
  padding:16px;
  background-color:var(--ink-800);
  background-image:repeating-linear-gradient(45deg,rgba(61,242,192,.07) 0 1px,transparent 1px 16px);
  color:var(--muted);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.2em;
  text-align:center;text-transform:uppercase;
}
.figure__cap{
  margin-top:10px;
  font-size:12px;line-height:1.7;color:var(--muted);
  max-width:40em;
}

/* 面包屑 */
.breadcrumb{margin-block:0 clamp(16px,2vw,24px)}
.breadcrumb__list{
  display:flex;flex-wrap:wrap;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;
  color:var(--muted);text-transform:uppercase;
}
.breadcrumb__item{display:inline-flex;align-items:center;gap:10px}
.breadcrumb__item+.breadcrumb__item::before{content:"/";color:var(--line-500)}
.breadcrumb__link{color:var(--muted);text-decoration:none;transition:color .16s var(--ease)}
.breadcrumb__link:hover{color:var(--cyan-400)}
.breadcrumb__item[aria-current="page"]{color:var(--cyan-200)}

/* 可展开内容组 */
.accordion{border-top:1px solid var(--line-500)}
.accordion__item{border-bottom:1px solid var(--line-500)}
.accordion__trigger{
  width:100%;
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:18px 0 18px 0;
  border:0;border-left:2px solid transparent;
  background:transparent;color:var(--text);
  font-size:16px;font-weight:500;line-height:1.5;text-align:left;
  cursor:pointer;
  transition:color .16s var(--ease),border-color .16s var(--ease),padding-left .16s var(--ease);
}
.accordion__trigger:hover{color:var(--cyan-200)}
.accordion__trigger::after{
  content:"+";flex:none;
  font-family:var(--font-mono);font-size:16px;color:var(--cyan-400);
  transition:transform .18s var(--ease);
}
.accordion__trigger[aria-expanded="true"]{
  color:var(--cyan-400);
  border-left-color:var(--cyan-400);
  padding-left:14px;
}
.accordion__trigger[aria-expanded="true"]::after{content:"–"}
.accordion__panel{padding:0 0 20px 0;color:var(--muted);font-size:15px;line-height:1.8}
.accordion__panel[hidden]{display:none}

/* 进入视口显现 */
[data-reveal]{
  transition:opacity .28s var(--ease),transform .28s var(--ease);
  transition-delay:var(--reveal-delay,0ms);
}
[data-reveal].is-pending{opacity:0;transform:translateY(16px)}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width:1200px){
  .footer__grid{grid-template-columns:1.4fr 1fr 1.2fr 1fr}
}
@media (max-width:960px){
  .grid{grid-template-columns:repeat(6,minmax(0,1fr))}
  .span-2,.span-3,.span-4,.span-5{grid-column:span 3}
  .span-6,.span-7,.span-8,.span-9,.span-10,.span-11,.span-12{grid-column:span 6}
  .footer__grid{grid-template-columns:1fr 1fr}
  .footer__col--brand{grid-column:1/-1}
}
@media (max-width:600px){
  .grid{grid-template-columns:minmax(0,1fr);gap:16px}
  .span-2,.span-3,.span-4,.span-5,.span-6,.span-7,.span-8,.span-9,.span-10,.span-11,.span-12{grid-column:1/-1}
  .section__head{grid-template-columns:1fr;gap:10px}
  .footer__grid{grid-template-columns:1fr}
  .footer__legal{flex-direction:column;align-items:flex-start}
  .figure__img,.figure__ph{aspect-ratio:4/3}
}

/* ============================================================
   降低动态效果
   ============================================================ */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms!important;
    animation-iteration-count:1!important;
    transition-duration:.001ms!important;
  }
  [data-reveal],
  [data-reveal].is-pending{opacity:1;transform:none}
}