/* ============================================================
   ABG俱乐部 · 共享基础样式 /assets/site.css
   运动电子蓝 × 能量荧光绿 · 编辑部非对称网格 · 直角精密线
   ============================================================ */

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:20px}
body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,blockquote,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video{display:block;max-width:100%}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:0;padding:0;cursor:pointer}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}
:focus-visible{outline:2px solid #4D94FF;outline-offset:2px}
#main-content{display:block}

/* ---------- tokens ---------- */
:root{
  --ink:#0B0E14;
  --ink-2:#121A2A;
  --ink-3:#182338;
  --blue:#0066FF;
  --blue-2:#4D94FF;
  --lime:#B4FF3A;
  --silver:#C7CEDB;
  --muted:#8A93A6;
  --paper:#F2F5FA;
  --cyan:#00E0C6;
  --magenta:#FF4D6D;
  --line:rgba(199,206,219,.16);
  --line-strong:rgba(199,206,219,.32);
  --grid-fine:rgba(199,206,219,.045);
  --grid-major:rgba(199,206,219,.085);
  --r:2px;
  --shell-max:1280px;
  --gutter:clamp(16px,4vw,40px);
  --ease:cubic-bezier(.2,.8,.2,1);
  --font-display:"Helvetica Neue",Helvetica,Arial,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-body:system-ui,-apple-system,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,"Liberation Mono",monospace;
}

/* ---------- base ---------- */
body{
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.75;
  color:var(--silver);
  background-color:var(--ink);
  background-image:
    linear-gradient(var(--grid-fine) 1px,transparent 1px),
    linear-gradient(90deg,var(--grid-fine) 1px,transparent 1px),
    linear-gradient(var(--grid-major) 1px,transparent 1px),
    linear-gradient(90deg,var(--grid-major) 1px,transparent 1px);
  background-size:8px 8px,8px 8px,96px 96px,96px 96px;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:900;letter-spacing:-.03em;line-height:1.05;color:var(--paper)}
h1{font-size:clamp(32px,6vw,64px);line-height:1}
h2{font-size:clamp(24px,4vw,40px)}
h3{font-size:clamp(19px,2.4vw,24px);line-height:1.2}
p{max-width:68ch}
::selection{background:var(--lime);color:var(--ink)}
strong{color:var(--paper);font-weight:700}

/* ---------- 容器与工具 ---------- */
.shell{width:min(calc(100% - var(--gutter)*2),var(--shell-max));margin-inline:auto}
.skip-link{
  position:absolute;left:12px;top:-64px;z-index:120;
  padding:10px 16px;background:var(--lime);color:var(--ink);
  font-weight:900;font-size:14px;border-radius:var(--r);
  transition:top .18s var(--ease);
}
.skip-link:focus{top:12px}
.scroll-progress{
  position:fixed;top:0;left:0;width:100%;height:3px;z-index:90;pointer-events:none;
  background:linear-gradient(90deg,var(--blue),var(--cyan) 55%,var(--lime));
  transform:scaleX(0);transform-origin:0 50%;
}

/* ---------- header : 仪表条 ---------- */
.site-header{position:relative;z-index:20}
.header-rail{
  background:var(--ink);
  border-bottom:1px solid var(--line);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;
}
.rail-inner{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:36px;padding:6px 0}
.rail-meta{display:flex;align-items:center;flex-wrap:wrap;gap:10px;max-width:none;color:var(--muted);text-transform:uppercase}
.rail-chip{
  display:inline-flex;align-items:center;height:18px;padding:0 7px;
  background:var(--lime);color:var(--ink);font-weight:700;letter-spacing:.06em;
}
.rail-chip--muted{background:transparent;color:var(--silver);border:1px solid var(--line-strong)}
.rail-text{color:var(--silver)}
.rail-note{color:var(--muted);text-align:right;max-width:none}

/* ---------- header : 刊头报头 ---------- */
.masthead{
  position:relative;overflow:hidden;
  background:
    radial-gradient(120% 170% at 10% 0%,rgba(0,102,255,.32),transparent 58%),
    radial-gradient(90% 140% at 94% 100%,rgba(180,255,58,.13),transparent 60%),
    var(--ink-2);
  border-bottom:1px solid var(--line-strong);
}
.masthead::before{
  content:"";position:absolute;inset:-30% -12%;pointer-events:none;opacity:.09;
  background:repeating-linear-gradient(104deg,rgba(199,206,219,.9) 0 1px,transparent 1px 52px);
  animation:speed-sweep 6s linear infinite;
}
@keyframes speed-sweep{
  0%{transform:translateX(-5%)}
  50%{transform:translateX(5%)}
  100%{transform:translateX(-5%)}
}
.masthead-inner{
  position:relative;
  display:grid;grid-template-columns:minmax(0,1fr) auto minmax(0,1fr);
  align-items:center;gap:18px;
  padding:clamp(24px,4.2vw,44px) 0 clamp(20px,3.4vw,34px);
}
.masthead-meta{
  display:flex;flex-direction:column;gap:5px;max-width:none;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.14em;
  text-transform:uppercase;color:var(--muted);
}
.masthead-meta span{display:block}
.masthead-meta--end{text-align:right;align-items:flex-end}
.brand{display:flex;flex-direction:column;align-items:center;gap:8px;text-align:center;padding:0 6px}
.brand-name{
  display:inline-flex;align-items:center;
  font-family:var(--font-display);font-weight:900;
  font-size:clamp(30px,6.4vw,58px);line-height:.98;letter-spacing:-.035em;color:var(--paper);
}
.brand-name::before{
  content:"";display:inline-block;width:.14em;height:.6em;margin-right:.16em;
  background:var(--lime);transform:skewX(-16deg);
}
.brand:hover .brand-name{color:#fff}
.brand-sub{
  font-family:var(--font-mono);font-size:clamp(10px,1.5vw,12.5px);
  letter-spacing:.24em;text-transform:uppercase;color:var(--lime);max-width:none;
}

/* ---------- header : 居中栏目导航 ---------- */
.site-nav{background:rgba(11,14,20,.96);border-bottom:1px solid var(--line-strong)}
.nav-inner{position:relative;display:flex;align-items:center;justify-content:center;min-height:56px}
.nav-panel{display:flex;align-items:center;justify-content:center;gap:clamp(10px,2.4vw,28px);width:100%}
.nav-list{display:flex;align-items:center;gap:clamp(4px,1.4vw,18px)}
.nav-item>a{
  position:relative;display:inline-block;padding:17px 10px;
  font-weight:700;font-size:15px;letter-spacing:.02em;color:var(--silver);
  transition:color .15s var(--ease);
}
.nav-item>a::after{
  content:"";position:absolute;left:10px;right:10px;bottom:10px;height:2px;
  background:var(--lime);transform:scaleX(0);transform-origin:0 50%;
  transition:transform .18s var(--ease),background .18s var(--ease);
}
.nav-item>a:hover{color:var(--paper)}
.nav-item>a:hover::after{transform:scaleX(1);background:var(--blue-2)}
.nav-item>a[aria-current="page"]{color:var(--paper)}
.nav-item>a[aria-current="page"]::after{transform:scaleX(1);background:var(--lime)}
.nav-toggle{display:none;align-items:center;gap:10px;width:100%;color:var(--paper);text-align:left}
.nav-toggle-mark{position:relative;display:block;flex:none;width:22px;height:14px}
.nav-toggle-bar{
  position:absolute;left:0;width:100%;height:2px;background:var(--lime);
  transition:transform .2s var(--ease),top .2s var(--ease);
}
.nav-toggle-bar:nth-child(1){top:2px}
.nav-toggle-bar:nth-child(2){top:10px}
.nav-toggle-label{font-weight:900;font-size:15px;letter-spacing:.08em}
.nav-cta{
  position:absolute;right:0;top:50%;transform:translateY(-50%);
  display:inline-flex;align-items:center;gap:9px;
  padding:12px 20px;background:var(--lime);color:var(--ink);
  font-weight:900;font-size:14px;letter-spacing:.04em;border-radius:var(--r);
  transition:transform .15s var(--ease),background .15s var(--ease),box-shadow .15s var(--ease);
}
.nav-cta::after{
  content:"";width:8px;height:8px;background:var(--ink);
  transform:skewX(-16deg);transition:transform .15s var(--ease);
}
.nav-cta:hover{background:#ccff70;transform:translateY(-50%) translateY(-2px);box-shadow:0 8px 24px -12px rgba(180,255,58,.95)}
.nav-cta:hover::after{transform:skewX(-16deg) translateX(3px)}

/* ---------- footer ---------- */
.site-footer{
  position:relative;overflow:hidden;margin-top:clamp(48px,7vw,96px);
  background:var(--ink-2);border-top:1px solid var(--line-strong);
}
.site-footer::before{
  content:"";position:absolute;top:0;left:0;right:0;height:72px;pointer-events:none;opacity:.55;
  background:repeating-linear-gradient(115deg,rgba(0,102,255,.30) 0 2px,transparent 2px 26px);
}
.footer-inner{position:relative;padding:clamp(40px,6vw,78px) 0 28px}
.footer-grid{display:grid;grid-template-columns:minmax(0,1.25fr) minmax(0,2fr);gap:clamp(28px,5vw,64px)}
.footer-logo{
  display:inline-block;font-family:var(--font-display);font-weight:900;
  font-size:clamp(22px,3vw,30px);letter-spacing:-.035em;color:var(--paper);
}
.footer-logo::before{
  content:"";display:inline-block;width:.16em;height:.6em;margin-right:.16em;
  background:var(--lime);transform:skewX(-16deg);
}
.footer-tagline{
  margin-top:10px;max-width:none;font-family:var(--font-mono);font-size:12px;
  letter-spacing:.18em;text-transform:uppercase;color:var(--lime);
}
.footer-note{margin-top:16px;font-size:14.5px;line-height:1.7;color:var(--muted);max-width:44ch}
.footer-nav{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(18px,3vw,34px)}
.footer-col-title{
  font-family:var(--font-body);font-size:13px;font-weight:900;letter-spacing:.14em;
  text-transform:uppercase;color:var(--paper);
  padding-bottom:10px;margin-bottom:14px;border-bottom:1px solid var(--line);
}
.footer-list li+li{margin-top:9px}
.footer-list a{
  display:inline-flex;align-items:center;font-size:15px;color:var(--muted);
  transition:color .15s var(--ease);
}
.footer-list a::before{
  content:"";width:8px;height:1px;background:var(--blue-2);margin-right:9px;flex:none;
  transition:width .15s var(--ease),background .15s var(--ease);
}
.footer-list a:hover{color:var(--lime)}
.footer-list a:hover::before{width:16px;background:var(--lime)}
.footer-contact{
  margin-top:clamp(30px,4.4vw,50px);padding-top:22px;border-top:1px solid var(--line);
}
.footer-contact-line{
  max-width:90ch;font-family:var(--font-mono);font-size:13px;line-height:1.9;
  letter-spacing:.03em;color:var(--silver);
}
.footer-contact-line+.footer-contact-line{color:var(--muted)}
.footer-bottom{
  display:flex;flex-wrap:wrap;gap:10px 26px;align-items:center;justify-content:space-between;
  margin-top:20px;padding-top:16px;border-top:1px solid var(--line);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;color:var(--muted);
}
.footer-icp{max-width:none;color:var(--silver)}
.footer-copy{max-width:none;color:var(--muted)}

/* ---------- 章节与标题组 ---------- */
.section{position:relative;padding:clamp(44px,6.5vw,92px) 0}
.section-head{max-width:900px}
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.22em;
  text-transform:uppercase;color:var(--lime);
}
.eyebrow::before{content:"";width:24px;height:2px;background:var(--lime);transform:skewX(-18deg)}
.section-title{
  margin-top:14px;font-family:var(--font-display);font-weight:900;
  font-size:clamp(26px,4.6vw,48px);line-height:1.02;letter-spacing:-.03em;color:var(--paper);
}
.section-lead{margin-top:14px;max-width:62ch;color:var(--silver)}
.hr-rule{height:1px;border:0;background:var(--line);margin:clamp(28px,4vw,48px) 0}

/* ---------- 网格 ---------- */
.grid{display:grid;gap:clamp(16px,2.6vw,28px)}
.grid--2{grid-template-columns:repeat(auto-fit,minmax(280px,1fr))}
.grid--3{grid-template-columns:repeat(auto-fit,minmax(230px,1fr))}
.grid--aside{grid-template-columns:1fr}
@media (min-width:960px){
  .grid--aside{grid-template-columns:minmax(0,260px) minmax(0,1fr);align-items:start}
}

/* ---------- 研究板 ---------- */
.board{display:grid;gap:clamp(18px,3vw,34px)}
@media (min-width:900px){
  .board{grid-template-columns:minmax(0,220px) minmax(0,1fr);align-items:start}
}
.board-note{
  max-width:none;padding-left:16px;border-left:1px solid var(--line-strong);
  font-family:var(--font-mono);font-size:12.5px;line-height:1.85;color:var(--muted);
}
.board-label{
  display:block;margin-bottom:7px;font-size:11px;letter-spacing:.18em;
  text-transform:uppercase;color:var(--lime);
}
.board-body{min-width:0}

/* ---------- 卡片 ---------- */
.card{
  position:relative;padding:clamp(18px,2.6vw,26px);
  background:var(--ink-2);border:1px solid var(--line);border-radius:var(--r);
  transition:transform .15s var(--ease),border-color .15s var(--ease),background .15s var(--ease);
}
.card:hover{transform:translateY(-4px);border-color:var(--blue-2)}
.card-title{
  font-family:var(--font-display);font-weight:900;font-size:20px;
  line-height:1.2;letter-spacing:-.02em;color:var(--paper);
}
.card-text{margin-top:10px;max-width:56ch;font-size:15.5px;color:var(--muted)}
.card-meta{margin-top:14px;font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--muted)}

/* ---------- 标签 ---------- */
.chip{
  display:inline-flex;align-items:center;gap:6px;padding:4px 9px;
  border:1px solid var(--line-strong);border-radius:var(--r);
  background:rgba(11,14,20,.4);
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.1em;
  text-transform:uppercase;color:var(--silver);
}
.chip--lime{border-color:var(--lime);color:var(--lime)}
.chip--blue{border-color:var(--blue-2);color:var(--blue-2)}
.chip--magenta{border-color:var(--magenta);color:var(--magenta)}
.chip--cyan{border-color:var(--cyan);color:var(--cyan)}

/* ---------- 数据标记 ---------- */
.data{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.04em}
.data-key{
  display:inline-flex;align-items:center;gap:7px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;color:var(--muted);
}
.data-key::before{content:"";width:7px;height:7px;flex:none;background:var(--blue)}
.data-key--lime::before{background:var(--lime)}
.data-key--cyan::before{background:var(--cyan)}
.data-key--magenta::before{background:var(--magenta)}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;gap:10px;
  padding:13px 22px;border:1px solid transparent;border-radius:var(--r);
  font-weight:800;font-size:15px;letter-spacing:.02em;
  transition:transform .15s var(--ease),background .15s var(--ease),color .15s var(--ease),border-color .15s var(--ease);
}
.btn--primary{background:var(--blue);color:#fff}
.btn--primary:hover{background:var(--blue-2);transform:translateY(-2px)}
.btn--lime{background:var(--lime);color:var(--ink)}
.btn--lime:hover{background:#ccff70;transform:translateY(-2px)}
.btn--ghost{border-color:var(--line-strong);color:var(--silver)}
.btn--ghost:hover{border-color:var(--blue-2);color:var(--paper);transform:translateY(-2px)}

/* ---------- 面包屑 ---------- */
.crumbs{
  display:flex;flex-wrap:wrap;align-items:center;gap:9px;
  padding:16px 0;border-bottom:1px solid var(--line);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;color:var(--muted);
}
.crumbs a{color:var(--muted);transition:color .15s var(--ease)}
.crumbs a:hover{color:var(--lime)}
.crumbs-sep{color:var(--line-strong)}
.crumbs [aria-current="page"]{color:var(--silver)}

/* ---------- 长文容器 ---------- */
.prose{max-width:780px}
.prose h2{margin:2em 0 .6em;font-size:clamp(22px,3vw,30px)}
.prose h3{margin:1.6em 0 .5em}
.prose p{margin-bottom:1.15em;color:var(--silver)}
.prose li{position:relative;padding-left:18px;margin-bottom:.55em;color:var(--silver)}
.prose li::before{content:"";position:absolute;left:0;top:.75em;width:8px;height:1px;background:var(--lime)}
.prose a{color:var(--blue-2);border-bottom:1px solid rgba(77,148,255,.45)}

/* ---------- 反向浅色分区 ---------- */
.surface-light{
  background:var(--paper);color:#0B0E14;
  background-image:
    linear-gradient(rgba(11,14,20,.05) 1px,transparent 1px),
    linear-gradient(90deg,rgba(11,14,20,.05) 1px,transparent 1px);
  background-size:32px 32px,32px 32px;
}
.surface-light h1,.surface-light h2,.surface-light h3,.surface-light h4{color:var(--ink)}
.surface-light p,.surface-light li{color:#2A3244}
.surface-light .section-lead{color:#2A3244}
.surface-light .eyebrow{color:var(--blue)}
.surface-light .eyebrow::before{background:var(--blue)}
.surface-light .board-note{color:#5A6478;border-left-color:rgba(11,14,20,.22)}
.surface-light .card{background:#fff;border-color:rgba(11,14,20,.12)}
.surface-light .card-text,.surface-light .card-meta{color:#5A6478}

/* ---------- 图片容器（页面阶段放置图片/内联 SVG） ---------- */
.figure{
  position:relative;display:block;overflow:hidden;width:100%;
  aspect-ratio:16/9;border:1px solid var(--line);border-radius:var(--r);
  background:
    linear-gradient(135deg,rgba(0,102,255,.22),transparent 55%),
    linear-gradient(315deg,rgba(180,255,58,.14),transparent 50%),
    var(--ink-3);
}
.figure img,.figure svg{width:100%;height:100%;object-fit:cover}
.figure--wide{aspect-ratio:21/9}
.figure--square{aspect-ratio:1/1}
.figure--tall{aspect-ratio:3/4}
.figure--cut{clip-path:polygon(0 0,100% 0,100% calc(100% - 24px),calc(100% - 24px) 100%,0 100%)}
.figure::after{
  content:"";position:absolute;inset:0;pointer-events:none;opacity:.35;
  background:repeating-linear-gradient(0deg,rgba(11,14,20,.5) 0 1px,transparent 1px 4px);
}
.figure-cap{
  display:flex;gap:10px;align-items:baseline;margin-top:10px;max-width:none;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;color:var(--muted);
}
.figure-cap::before{content:"";width:14px;height:1px;flex:none;background:var(--lime);transform:translateY(-4px)}

/* ---------- 动效 ---------- */
.has-js [data-reveal]{
  opacity:0;transform:translateY(12px);
  transition:opacity .32s var(--ease),transform .32s var(--ease);
}
.has-js [data-reveal].is-visible{opacity:1;transform:none}

/* ---------- 响应式：平板 / 手机 ---------- */
@media (max-width:940px){
  .rail-text{display:none}
  .rail-note{font-size:11px}
  .masthead-inner{grid-template-columns:1fr;justify-items:center;gap:12px}
  .masthead-meta{flex-direction:row;justify-content:center;align-items:center;gap:16px;text-align:center}
  .masthead-meta--end{display:none}

  .nav-inner{flex-direction:column;align-items:stretch;min-height:0}
  .nav-toggle{display:flex;padding:15px 0}
  .nav-panel{display:none}
  .site-nav[data-open]{background:var(--ink-2)}
  .site-nav[data-open] .nav-panel{
    display:flex;flex-direction:column;align-items:stretch;gap:0;
    padding-bottom:22px;animation:panel-in .24s var(--ease);
  }
  .site-nav[data-open] .nav-toggle-bar:nth-child(1){top:6px;transform:rotate(45deg)}
  .site-nav[data-open] .nav-toggle-bar:nth-child(2){top:6px;transform:rotate(-45deg)}
  .nav-list{flex-direction:column;align-items:stretch;gap:0;border-top:1px solid var(--line)}
  .nav-item>a{display:block;padding:15px 2px;font-size:17px;border-bottom:1px solid var(--line)}
  .nav-item>a::after{left:2px;right:auto;width:26px;bottom:10px}
  .nav-cta{position:static;transform:none;justify-content:center;width:100%;margin-top:20px;padding:14px 20px}
  .nav-cta:hover{transform:translateY(-2px)}

  .footer-grid{grid-template-columns:1fr;gap:34px}
  .footer-note{max-width:none}
}
@keyframes panel-in{from{opacity:0;transform:translateY(-6px)}to{opacity:1;transform:none}}

@media (max-width:720px){
  body{font-size:16.5px}
  .footer-nav{grid-template-columns:repeat(2,minmax(0,1fr));gap:26px}
  .footer-bottom{flex-direction:column;align-items:flex-start;gap:8px}
}
@media (max-width:480px){
  .footer-nav{grid-template-columns:1fr}
  .rail-note{display:none}
  .figure--cut{clip-path:polygon(0 0,100% 0,100% calc(100% - 16px),calc(100% - 16px) 100%,0 100%)}
}

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