/* ==========================================================================
   亿万28链接 · 共享样式表  /assets/site.css
   暗夜档案 / 链接节点 / 等宽标签 / 错层网格 / 粗描边
   ========================================================================== */

/* ---------- 1. Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0}
h1,h2,h3,h4,h5,h6,p,ul,ol,li,figure,blockquote,dl,dd,fieldset{margin:0;padding:0}
ul,ol{list-style:none}
a{color:inherit;text-decoration:none}
img,svg,video{display:block;max-width:100%;height:auto}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:0;cursor:pointer}
table{border-collapse:collapse;width:100%}
hr{border:0;border-top:1px solid var(--line)}

/* ---------- 2. 变量 ---------- */
:root{
  --ink-900:#060B1A;
  --ink-800:#0E1730;
  --ink-700:#18244A;
  --cyan:#2BE3D2;
  --violet:#7C5CFF;
  --orange:#FF8A3D;
  --lemon:#C8F35A;
  --text:#E9EFFA;
  --text-dim:#9DAAD0;
  --line:#3C4A75;
  --shell:1240px;
  --gutter:clamp(16px,4vw,40px);
  --nav-h:64px;
  --font-display:"Source Han Sans SC","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-body:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-editorial:"Source Serif 4","Source Serif Pro",Georgia,"Songti SC","SimSun",serif;
  --font-mono:"JetBrains Mono","SFMono-Regular",Menlo,Consolas,"Liberation Mono","Courier New",monospace;
}

/* ---------- 3. 基础排版 ---------- */
body{
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  letter-spacing:.01em;
  color:var(--text);
  background-color:var(--ink-900);
  background-image:
    radial-gradient(circle at 14% -14%, rgba(124,92,255,.22), transparent 44%),
    radial-gradient(circle at 90% 0%, rgba(43,227,210,.13), transparent 38%),
    repeating-linear-gradient(115deg, rgba(60,74,117,.16) 0 1px, transparent 1px 7px);
  min-height:100vh;
}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:900;line-height:1.16;letter-spacing:.04em;color:var(--text)}
h1{font-size:clamp(30px,4.4vw,48px)}
h2{font-size:clamp(22px,2.6vw,30px)}
h3{font-size:clamp(18px,2vw,22px);letter-spacing:.03em}
h4{font-size:17px;letter-spacing:.03em}
p{font-size:16px}
strong,b{font-weight:700;color:var(--text)}
small{font-size:12px}
::selection{background:var(--cyan);color:var(--ink-900)}
[id]{scroll-margin-top:calc(var(--nav-h) + 48px)}

/* ---------- 4. 焦点与无障碍 ---------- */
:focus-visible{outline:2px solid var(--cyan);outline-offset:2px}
.skip-link{
  position:absolute;left:var(--gutter);top:-80px;z-index:200;
  padding:10px 18px;background:var(--cyan);color:var(--ink-900);
  border:2px solid var(--ink-900);font-family:var(--font-mono);
  font-size:13px;letter-spacing:.08em;transition:top .18s ease;
}
.skip-link:focus{top:10px}

/* ---------- 5. 布局骨架 ---------- */
.shell{width:100%;max-width:var(--shell);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding:clamp(48px,7vw,96px) 0}
.section--band{background:var(--ink-800);border-top:2px solid var(--line);border-bottom:2px solid var(--line)}
.section-head{
  display:flex;flex-wrap:wrap;align-items:baseline;gap:10px 20px;
  margin-bottom:28px;padding-bottom:14px;border-bottom:2px solid var(--line);
}
.section-head h2{flex:1 1 240px}
.eyebrow{font-family:var(--font-mono);font-size:12px;letter-spacing:.18em;color:var(--cyan);text-transform:uppercase}
.lede{font-size:17px;line-height:1.75;color:var(--text-dim);max-width:62ch}
.mono{font-family:var(--font-mono);font-size:13px;letter-spacing:.06em}
.num{font-family:var(--font-editorial);font-style:normal;letter-spacing:.02em}

.doc-grid{display:grid;grid-template-columns:repeat(12,1fr);gap:clamp(20px,2.6vw,36px)}
.doc-main{grid-column:1 / span 7;min-width:0}
.doc-aside{grid-column:9 / span 4;min-width:0}
@media (max-width:900px){
  .doc-grid{grid-template-columns:1fr}
  .doc-main,.doc-aside{grid-column:1 / -1}
}

/* ---------- 6. 文本与标签 ---------- */
.prose{max-width:70ch}
.prose p{margin-bottom:1.1em}
.prose p:last-child{margin-bottom:0}
.prose h2,.prose h3{margin:1.6em 0 .6em;padding-left:14px;border-left:4px solid var(--cyan)}
.prose ul,.prose ol{margin:0 0 1.2em;display:grid;gap:8px}
.prose li{position:relative;padding-left:20px}
.prose li::before{content:"";position:absolute;left:0;top:.72em;width:8px;height:2px;background:var(--violet)}
.prose a{border-bottom:1px solid var(--cyan);color:var(--cyan)}

.tag{
  display:inline-flex;align-items:center;gap:6px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;
  padding:4px 10px;border:1px solid var(--line);background:rgba(24,36,74,.7);color:var(--text-dim);
  transition:color .15s ease,border-color .15s ease,background-color .15s ease;
}
.tag--cyan{border-color:var(--cyan);color:var(--cyan);background:rgba(43,227,210,.08)}
.tag--violet{border-color:var(--violet);color:#B9A8FF;background:rgba(124,92,255,.10)}
.tag--orange{border-color:var(--orange);color:var(--orange);background:rgba(255,138,61,.10)}
.tag--lemon{border-color:var(--lemon);color:var(--lemon);background:rgba(200,243,90,.10)}

.breadcrumbs{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  padding:14px 0;font-family:var(--font-mono);font-size:12px;
  letter-spacing:.06em;color:var(--text-dim);
}
.breadcrumbs li{display:flex;align-items:center;gap:8px}
.breadcrumbs li + li::before{content:"/";color:var(--line)}
.breadcrumbs a:hover{color:var(--cyan)}
.breadcrumbs [aria-current="page"]{color:var(--lemon)}

.toc{display:grid;gap:4px;align-content:start}
.toc-link{
  position:relative;display:block;padding:8px 8px 8px 18px;
  font-family:var(--font-mono);font-size:13px;letter-spacing:.04em;
  color:var(--text-dim);transition:color .18s ease,background-color .18s ease;
}
.toc-link::before{content:"";position:absolute;left:0;top:50%;width:6px;height:2px;background:var(--line);transform:translateY(-50%)}
.toc-link:hover{color:var(--text);background:var(--ink-800)}
.toc-link[data-current]{color:var(--lemon);background:rgba(200,243,90,.07)}
.toc-link[data-current]::before{width:12px;background:var(--lemon)}

/* ---------- 7. 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;gap:10px;
  padding:12px 20px;border:2px solid var(--line);background:var(--ink-700);
  color:var(--text);font-family:var(--font-mono);font-size:13px;letter-spacing:.08em;
  transition:transform .15s ease,border-color .15s ease,background-color .15s ease,color .15s ease,box-shadow .15s ease;
}
.btn:hover{border-color:var(--cyan);color:var(--cyan);transform:translate(-2px,-2px);box-shadow:5px 5px 0 rgba(43,227,210,.25)}
.btn--primary{background:var(--cyan);border-color:var(--cyan);color:var(--ink-900);font-weight:700}
.btn--primary:hover{background:var(--lemon);border-color:var(--lemon);color:var(--ink-900);box-shadow:5px 5px 0 rgba(124,92,255,.45)}
.btn--warm{background:var(--orange);border-color:var(--orange);color:var(--ink-900);font-weight:700}
.btn--warm:hover{background:#FFA668;border-color:#FFA668;color:var(--ink-900);box-shadow:5px 5px 0 rgba(255,138,61,.3)}
.btn--ghost{background:transparent}

/* ---------- 8. 面板与卡片 ---------- */
.panel{background:var(--ink-800);border:2px solid var(--line);padding:clamp(18px,2.4vw,28px)}
.panel--raised{background:var(--ink-700);box-shadow:8px 8px 0 rgba(6,11,26,.7)}
.card{
  display:block;background:var(--ink-700);border:2px solid var(--line);
  padding:20px;transition:border-color .18s ease,transform .18s ease,box-shadow .18s ease;
}
.card:hover{border-color:var(--cyan);transform:translateY(-3px);box-shadow:0 8px 0 rgba(43,227,210,.18)}

/* ---------- 9. 图片容器（页面阶段放置图片） ---------- */
.figure{
  position:relative;margin:0;border:2px solid var(--line);
  background:var(--ink-800);overflow:hidden;
}
.figure img{width:100%;height:100%;object-fit:cover}
.figure--16x9{aspect-ratio:16 / 9}
.figure--4x3{aspect-ratio:4 / 3}
.figure--1x1{aspect-ratio:1 / 1}
.figure--3x4{aspect-ratio:3 / 4}
.figure--placeholder{
  display:grid;place-items:center;
  background-image:
    repeating-linear-gradient(135deg, rgba(60,74,117,.42) 0 2px, transparent 2px 11px),
    radial-gradient(circle at 28% 18%, rgba(43,227,210,.16), transparent 56%),
    radial-gradient(circle at 82% 88%, rgba(124,92,255,.18), transparent 52%),
    linear-gradient(var(--ink-800),var(--ink-800));
}
.figure--placeholder::after{
  content:attr(data-label);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;
  color:var(--text-dim);text-align:center;padding:0 12px;
}
.figure-cap{
  padding-top:10px;font-family:var(--font-mono);
  font-size:12px;letter-spacing:.05em;color:var(--text-dim);
}
.figure-grid{display:grid;gap:16px}
@media (min-width:720px){
  .figure-grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
  .figure-grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
}

/* ---------- 10. 页头 ---------- */
.site-header{
  position:sticky;top:0;z-index:60;
  background:var(--ink-900);
  border-bottom:2px solid var(--line);
}
.header-strip{
  background:var(--ink-800);
  border-bottom:1px solid var(--line);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;color:var(--text-dim);
}
.strip-grid{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:8px 20px;min-height:36px}
.strip-note{display:flex;align-items:center;gap:10px;font-size:12px}
.strip-dot{width:8px;height:8px;flex:none;background:var(--cyan);box-shadow:0 0 10px rgba(43,227,210,.85)}
.strip-tools{display:flex;align-items:center;gap:18px}
.strip-tools li{display:flex}
.tool-link,.tool-btn{
  font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;
  color:var(--text-dim);border-bottom:1px solid transparent;padding-bottom:1px;
  transition:color .15s ease,border-color .15s ease;
}
.tool-link:hover,.tool-btn:hover{color:var(--cyan);border-bottom-color:var(--cyan)}

.header-main{position:relative;background:var(--ink-900)}
.header-grid{display:flex;align-items:stretch;justify-content:space-between;gap:20px;min-height:var(--nav-h)}

.brand{display:flex;align-items:center;gap:12px;padding:10px 0}
.brand-mark{
  display:grid;place-items:center;flex:none;
  width:38px;height:38px;background:var(--cyan);color:var(--ink-900);
  border:2px solid var(--cyan);box-shadow:4px 4px 0 rgba(124,92,255,.6);
  font-family:var(--font-display);font-weight:900;font-size:20px;line-height:1;
}
.brand-text{display:flex;flex-direction:column;line-height:1.15}
.brand-name{font-family:var(--font-display);font-weight:900;font-size:20px;letter-spacing:.06em;color:var(--text)}
.brand-sub{font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;color:var(--text-dim);text-transform:uppercase}

.primary-nav{display:flex;align-items:stretch}
.nav-list{display:flex;align-items:stretch}
.nav-list li{display:flex}
.nav-link{
  position:relative;display:flex;align-items:center;
  padding:0 16px;font-size:15px;font-weight:500;color:var(--text-dim);
  border-left:1px solid rgba(60,74,117,.55);
  transition:color .18s ease,background-color .18s ease;
}
.nav-link:hover{color:var(--text);background:var(--ink-800)}
.nav-link[aria-current="page"]{color:var(--text);background:var(--ink-800)}
.nav-link[aria-current="page"]::after{
  content:"";position:absolute;left:12px;right:12px;bottom:10px;height:3px;background:var(--cyan);
}

.nav-toggle{
  display:none;align-items:center;gap:10px;align-self:center;
  padding:9px 14px;border:2px solid var(--line);background:var(--ink-800);
  color:var(--text);font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;
  transition:border-color .18s ease,color .18s ease;
}
.nav-toggle:hover{border-color:var(--cyan);color:var(--cyan)}
.nav-toggle-bars{position:relative;width:18px;height:2px;background:var(--cyan);flex:none}
.nav-toggle-bars::before,.nav-toggle-bars::after{content:"";position:absolute;left:0;width:18px;height:2px;background:var(--cyan)}
.nav-toggle-bars::before{top:-6px}
.nav-toggle-bars::after{top:6px}
.site-header[data-open] .nav-toggle{border-color:var(--cyan);color:var(--cyan)}

.scroll-progress{
  position:absolute;left:0;right:0;bottom:-2px;height:3px;
  background:rgba(60,74,117,.35);overflow:hidden;
}
.scroll-progress-bar{
  display:block;height:100%;width:0;
  background:linear-gradient(90deg,var(--cyan),var(--violet));
  transition:width .1s linear;
}

/* ---------- 11. 页脚 ---------- */
.site-footer{
  margin-top:clamp(40px,6vw,80px);
  background:var(--ink-800);
  border-top:2px solid var(--line);
}
.footer-grid{
  display:grid;gap:32px 26px;
  grid-template-columns:minmax(240px,1.5fr) repeat(4,minmax(0,1fr));
  padding:clamp(40px,6vw,64px) 0 clamp(28px,4vw,40px);
}
.footer-brand{display:grid;gap:16px;align-content:start}
.brand--footer{padding:0}
.footer-note{font-size:13px;line-height:1.75;color:var(--text-dim);max-width:36ch}
.footer-cta{justify-self:start}
.footer-meta{font-family:var(--font-mono);font-size:12px;letter-spacing:.05em;color:var(--text-dim)}
.footer-col{padding-left:16px;border-left:2px solid rgba(60,74,117,.4)}
.footer-col--flag{border-left-color:var(--orange)}
.footer-col--flag .footer-col-title .num{color:var(--orange)}
.footer-col--flag .footer-link:hover{color:var(--orange)}
.footer-col-title{
  display:flex;align-items:baseline;gap:8px;
  margin-bottom:14px;padding-bottom:10px;border-bottom:1px solid var(--line);
  font-family:var(--font-mono);font-size:12px;font-weight:700;letter-spacing:.14em;
  color:var(--text);text-transform:uppercase;
}
.footer-col-title .num{font-size:13px;color:var(--cyan)}
.footer-list{display:grid;gap:9px}
.footer-link{
  display:inline-block;font-size:14px;line-height:1.6;color:var(--text-dim);
  transition:color .15s ease,padding-left .15s ease;
}
.footer-link:hover{color:var(--cyan);padding-left:6px}
.footer-static{font-size:14px;line-height:1.65;color:var(--text-dim);word-break:break-word}
.footer-contact{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.copy-btn{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;
  padding:3px 9px;border:1px solid var(--line);color:var(--lemon);
  transition:color .15s ease,border-color .15s ease,background-color .15s ease;
}
.copy-btn:hover{color:var(--ink-900);background:var(--lemon);border-color:var(--lemon)}
.footer-base{border-top:1px solid var(--line);background:var(--ink-900)}
.footer-base-inner{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:10px 24px;padding:18px 0;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.05em;color:var(--text-dim);
}

/* ---------- 12. 返回顶部 ---------- */
.to-top{
  position:fixed;right:clamp(14px,3vw,28px);bottom:clamp(14px,3vw,28px);z-index:70;
  display:inline-flex;align-items:center;gap:8px;
  padding:10px 14px;border:2px solid var(--cyan);background:var(--ink-900);
  color:var(--cyan);font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;
  opacity:0;visibility:hidden;transform:translateY(10px);
  transition:opacity .2s ease,transform .2s ease,visibility .2s ease,background-color .2s ease,color .2s ease;
}
.to-top[data-visible]{opacity:1;visibility:visible;transform:none}
.to-top:hover{background:var(--cyan);color:var(--ink-900)}

/* ---------- 13. 渐显 ---------- */
html.has-js [data-reveal]{opacity:0;transform:translateY(16px);transition:opacity .5s ease,transform .5s ease}
html.has-js [data-reveal].is-in{opacity:1;transform:none}

/* ---------- 14. 响应式 ---------- */
@media (max-width:1080px){
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-brand{grid-column:1 / -1}
}
@media (max-width:900px){
  .nav-toggle{display:inline-flex}
  .header-grid{min-height:auto;padding-block:10px;align-items:center}
  .primary-nav{
    position:absolute;left:0;right:0;top:100%;z-index:55;
    display:block;max-height:0;overflow:hidden;visibility:hidden;
    background:var(--ink-800);border-top:1px solid var(--line);border-bottom:2px solid var(--line);
    transition:max-height .3s ease,visibility .3s ease;
  }
  .primary-nav[data-open]{max-height:min(72vh,540px);overflow-y:auto;visibility:visible}
  .nav-list{flex-direction:column;align-items:stretch;padding:6px 0}
  .nav-list li{display:block}
  .nav-link{
    width:100%;padding:14px 20px;font-size:16px;
    border-left:0;border-top:1px solid rgba(60,74,117,.45);
  }
  .nav-list li:first-child .nav-link{border-top:0}
  .nav-link[aria-current="page"]::after{left:0;top:0;bottom:0;right:auto;width:4px;height:auto}
}
@media (max-width:600px){
  .footer-grid{grid-template-columns:1fr}
  .footer-col{padding-left:12px}
  .strip-tools{gap:14px}
  .footer-base-inner{flex-direction:column;align-items:flex-start}
}

/* ---------- 15. 动效降级 ---------- */
@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.has-js [data-reveal]{opacity:1;transform:none}
  .to-top{transform:none}
}