/* =========================================================
   JDB电子 · 高原信号灯 Site Kit
   /assets/site.css — 共享外壳：reset / 变量 / 中文排版 / 页头 / 页脚 / 基础组件
   ========================================================= */

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body,h1,h2,h3,h4,h5,h6,p,figure,blockquote,dl,dd{margin:0;}
ul,ol{margin:0;padding:0;list-style:none;}
img,svg,video{display:block;max-width:100%;}
a{color:inherit;text-decoration:none;}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer;}
h1,h2,h3,h4{font-weight:900;line-height:1.12;letter-spacing:.02em;}

/* ---------- tokens ---------- */
:root{
  --ink:#0E1B2A;
  --snow:#F7F4EC;
  --cinnabar:#C73A2B;
  --dark-cinnabar:#7A1F18;
  --turquoise:#177A6B;
  --deep-turquoise:#0F3D36;
  --gold:#C9A24B;
  --paper:#E9E2D6;
  --mist:#9DB4C0;
  --amber:#F2B544;

  --hair:rgba(157,180,192,.26);
  --hair-strong:rgba(201,162,75,.42);
  --hair-ink:rgba(14,27,42,.18);

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

  --shell:1240px;
  --gutter:clamp(18px,4.2vw,44px);
  --r-lg:32px;
  --r-md:20px;
  --r-sm:12px;
  --r-pill:999px;
  --ease:cubic-bezier(.2,.7,.2,1);
  --lift:0 22px 48px -26px rgba(4,10,18,.75);
  --header-h:0px;
}

/* ---------- base ---------- */
body{
  font-family:var(--font-body);
  font-size:clamp(16px,1.05vw,17px);
  line-height:1.75;
  color:var(--snow);
  background-color:var(--ink);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
#main-content{display:block;outline:none;}
#main-content,section[id],h2[id],h3[id],div[id]{scroll-margin-top:clamp(84px,13vw,150px);}
:focus-visible{outline:3px solid var(--amber);outline-offset:3px;border-radius:6px;}

/* ---------- skip link ---------- */
.skip-link{
  position:fixed;left:14px;top:-120px;z-index:220;
  background:var(--amber);color:var(--ink);
  padding:10px 20px;border-radius:0 0 16px 16px;
  font-size:14px;font-weight:700;letter-spacing:.05em;
  transition:top .25s var(--ease);
}
.skip-link:focus{top:0;}

/* ---------- 画框竖线 ---------- */
.frame-edge{display:none;}
@media (min-width:1100px){
  .frame-edge{
    display:block;position:fixed;top:0;bottom:0;width:1px;z-index:2;pointer-events:none;
    background:linear-gradient(180deg,
      rgba(201,162,75,.55) 0%,
      rgba(157,180,192,.16) 30%,
      rgba(157,180,192,.16) 68%,
      rgba(199,58,43,.5) 100%);
  }
  .frame-edge--left{left:16px;}
  .frame-edge--right{right:16px;}
}

/* =========================================================
   HEADER —— 框架式导航
   ========================================================= */
.site-header{
  position:relative;
  z-index:60;
  background:linear-gradient(180deg,#0E1B2A 0%,#102434 100%);
  border-bottom:1px solid var(--hair-strong);
  color:var(--snow);
}
@media (min-width:900px){
  .site-header{position:sticky;top:0;}
}
.site-header__inner{
  width:100%;max-width:var(--shell);margin-inline:auto;
  padding-inline:var(--gutter);
}
.site-header__rail{
  display:flex;align-items:center;flex-wrap:wrap;
  gap:10px 16px;
  padding-block:14px 12px;
}
@media (min-width:900px){
  .site-header__rail{padding-block:18px 8px;gap:18px;}
}

/* brand */
.brand{
  display:inline-flex;align-items:center;gap:12px;
  flex:1 1 auto;min-width:0;order:1;
}
.brand__mark{
  flex:0 0 auto;width:14px;height:14px;border-radius:5px;
  background:var(--cinnabar);
  box-shadow:0 0 0 4px rgba(199,58,43,.18);
}
.brand__text{display:flex;flex-direction:column;line-height:1.18;min-width:0;}
.brand__name{
  font-family:var(--font-display);font-weight:900;
  font-size:clamp(16px,1.6vw,19px);letter-spacing:.09em;
  white-space:nowrap;
}
.brand__sub{
  font-size:10.5px;letter-spacing:.2em;
  color:var(--mist);
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
}
@media (max-width:420px){
  .brand__sub{font-size:9.5px;letter-spacing:.14em;}
}

/* 快捷胶囊 */
.rail-actions{
  display:flex;align-items:center;gap:8px;
  order:3;flex:1 0 100%;
  overflow-x:auto;padding-bottom:2px;
  scrollbar-width:none;
}
.rail-actions::-webkit-scrollbar{display:none;}
@media (min-width:900px){
  .rail-actions{order:2;flex:0 0 auto;overflow:visible;padding-bottom:0;}
}
.pill-link{
  display:inline-flex;align-items:center;gap:6px;
  padding:8px 14px;border-radius:var(--r-pill);
  border:1px solid var(--hair);
  font-size:12.5px;font-weight:600;letter-spacing:.06em;
  white-space:nowrap;
  transition:background .25s var(--ease),color .25s var(--ease),border-color .25s var(--ease),transform .25s var(--ease);
}
.pill-link:hover{transform:translateY(-1px);}
.pill-link--red{
  border-color:rgba(199,58,43,.62);
  background:rgba(199,58,43,.16);
  color:#FBE9E5;
}
.pill-link--red:hover{background:var(--cinnabar);border-color:var(--cinnabar);color:#fff;}
.pill-link--gold{
  border-color:rgba(201,162,75,.58);
  color:#F1DFB4;
}
.pill-link--gold:hover{background:var(--gold);border-color:var(--gold);color:var(--ink);}

/* 移动端导航按钮 */
.nav-toggle{
  display:inline-flex;align-items:center;gap:9px;
  order:2;padding:10px 15px;
  border-radius:var(--r-pill);
  border:1px solid var(--hair-strong);
  font-size:12.5px;font-weight:600;letter-spacing:.12em;
  color:var(--snow);
  transition:background .25s var(--ease),border-color .25s var(--ease);
}
.nav-toggle:hover{background:rgba(247,244,236,.08);}
.nav-toggle__bars{display:inline-flex;flex-direction:column;gap:4px;width:18px;}
.nav-toggle__bars span{
  display:block;height:2px;border-radius:2px;background:currentColor;
  transition:transform .3s var(--ease),opacity .3s var(--ease);
}
.site-header[data-open] .nav-toggle{border-color:var(--amber);color:var(--amber);}
.site-header[data-open] .nav-toggle__bars span:first-child{transform:translateY(3px) rotate(45deg);}
.site-header[data-open] .nav-toggle__bars span:last-child{transform:translateY(-3px) rotate(-45deg);}
@media (min-width:900px){
  .nav-toggle{display:none;}
}

/* 导航：桌面为展签横排 */
.site-nav{
  width:100%;
  padding-bottom:12px;
}
.site-nav__list{display:flex;flex-wrap:wrap;gap:6px 8px;}
.site-nav__item{display:block;}
.site-nav__link{
  display:inline-flex;align-items:center;gap:9px;
  padding:8px 16px;border-radius:var(--r-pill);
  border:1px solid transparent;
  font-size:14px;font-weight:600;letter-spacing:.05em;
  color:rgba(247,244,236,.76);
  transition:background .25s var(--ease),color .25s var(--ease),border-color .25s var(--ease);
}
.site-nav__link::before{
  content:"";width:6px;height:6px;border-radius:50%;
  background:currentColor;opacity:.5;
  transition:background .25s var(--ease),opacity .25s var(--ease),box-shadow .25s var(--ease);
}
.site-nav__link:hover{
  color:var(--snow);
  background:rgba(247,244,236,.08);
  border-color:var(--hair);
}
.site-nav__link[aria-current="page"]{
  background:var(--cinnabar);
  border-color:var(--cinnabar);
  color:#fff;
}
.site-nav__link[aria-current="page"]::before{
  background:var(--amber);opacity:1;
  box-shadow:0 0 0 3px rgba(242,181,68,.28);
}

/* 导航：移动端底部展签面板 */
@media (max-width:899px){
  .site-nav{
    position:fixed;left:12px;right:12px;bottom:12px;z-index:80;
    width:auto;
    padding:18px 16px 12px;
    background:linear-gradient(180deg,#102434 0%,#0E1B2A 100%);
    border:1px solid var(--hair-strong);
    border-radius:var(--r-lg);
    box-shadow:0 30px 70px -24px rgba(0,0,0,.85);
    max-height:72vh;overflow-y:auto;
    transform:translateY(calc(100% + 28px));
    opacity:0;visibility:hidden;
    transition:transform .38s var(--ease),opacity .28s var(--ease),visibility .38s var(--ease);
  }
  .site-header[data-open] .site-nav{
    transform:translateY(0);
    opacity:1;visibility:visible;
  }
  .site-nav__list{flex-direction:column;gap:6px;}
  .site-nav__link{
    width:100%;justify-content:flex-start;
    padding:13px 18px;font-size:16px;
    border-color:var(--hair);
    color:var(--snow);
  }
  .site-nav__link[aria-current="page"]{border-color:var(--cinnabar);}
}

/* 滚动信号条 */
.scroll-meter{
  position:fixed;left:0;right:0;top:0;height:3px;z-index:95;
  background:rgba(157,180,192,.16);
  pointer-events:none;
}
.scroll-meter__bar{
  display:block;height:100%;width:0;
  background:linear-gradient(90deg,var(--turquoise) 0%,var(--amber) 55%,var(--cinnabar) 100%);
  transition:width .12s linear;
}

/* =========================================================
   FOOTER —— 层次式展签
   ========================================================= */
.site-footer{
  position:relative;
  background:var(--ink);
  color:var(--snow);
  border-top:1px solid var(--hair-strong);
  overflow:hidden;
}
.site-footer::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:
    radial-gradient(115% 78% at 100% 0%, rgba(23,122,107,.26) 0%, rgba(23,122,107,0) 62%),
    radial-gradient(92% 70% at 0% 100%, rgba(199,58,43,.2) 0%, rgba(199,58,43,0) 58%);
}
.site-footer__inner{
  position:relative;z-index:1;
  width:100%;max-width:var(--shell);margin-inline:auto;
  padding:clamp(40px,6vw,74px) var(--gutter) 26px;
}
.footer-grid{
  display:grid;gap:34px 28px;
  grid-template-columns:1fr;
}
@media (min-width:720px){
  .footer-grid{grid-template-columns:1.15fr .85fr;gap:38px 30px;}
  .footer-col--brand{grid-column:1 / -1;}
}
@media (min-width:1080px){
  .footer-grid{grid-template-columns:1.5fr .62fr .72fr .66fr;}
  .footer-col--brand{grid-column:auto;}
}
.footer-col{min-width:0;}
.footer-brand{display:flex;align-items:center;gap:11px;}
.footer-brand__mark{
  flex:0 0 auto;width:12px;height:12px;border-radius:4px;
  background:var(--turquoise);
  box-shadow:0 0 0 4px rgba(23,122,107,.22);
}
.footer-brand__name{
  font-family:var(--font-display);font-weight:900;
  font-size:16px;letter-spacing:.08em;
}
.footer-tagline{
  margin-top:14px;max-width:34ch;
  font-size:15px;line-height:1.75;color:rgba(247,244,236,.74);
}
.footer-contact{
  margin-top:22px;
  display:flex;flex-direction:column;gap:12px;
  padding-top:18px;
  border-top:1px solid var(--hair);
}
.footer-contact__item{display:flex;flex-direction:column;gap:2px;}
.footer-contact__label{
  font-size:10.5px;letter-spacing:.2em;
  color:var(--gold);font-weight:600;
}
.footer-contact__value{
  font-family:var(--font-mono);
  font-size:14px;letter-spacing:.02em;
  color:var(--snow);
  word-break:break-word;
}
.footer-contact__value--text{
  font-family:var(--font-body);
  font-size:14.5px;letter-spacing:.01em;
  color:rgba(247,244,236,.86);
}
.footer-note{
  margin-top:16px;
  font-size:12.5px;line-height:1.7;
  color:rgba(157,180,192,.9);
  max-width:40ch;
}
.footer-col__title{
  font-size:11px;font-weight:600;
  letter-spacing:.24em;
  color:var(--gold);
  margin-bottom:16px;
  padding-bottom:10px;
  border-bottom:1px solid var(--hair);
}
.footer-links{display:flex;flex-direction:column;gap:9px;}
.footer-link{
  display:inline-block;width:fit-content;
  font-size:15px;color:rgba(247,244,236,.76);
  border-bottom:1px solid transparent;
  transition:color .25s var(--ease),border-color .25s var(--ease);
}
.footer-link:hover{color:var(--snow);border-bottom-color:var(--gold);}
.footer-link--sm{font-size:13px;color:rgba(157,180,192,.95);}
.footer-meta{
  margin-top:14px;
  font-size:13px;line-height:1.7;
  color:rgba(157,180,192,.9);
}
.footer-base{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:12px 24px;
  margin-top:clamp(30px,5vw,44px);
  padding-top:20px;
  border-top:1px solid var(--hair);
  font-size:13px;
  color:rgba(157,180,192,.92);
}
.footer-base__icp{
  font-family:var(--font-mono);
  letter-spacing:.05em;
}
.footer-base__copyright{letter-spacing:.03em;}
.footer-base__meta{display:flex;flex-wrap:wrap;gap:16px;align-items:center;}

/* =========================================================
   共享组件
   ========================================================= */
.shell{
  width:100%;max-width:var(--shell);margin-inline:auto;
  padding-inline:var(--gutter);
}
.section{
  position:relative;
  padding-block:clamp(46px,7.5vw,96px);
}
.surface-snow{background:var(--snow);color:var(--ink);}
.surface-paper{background:var(--paper);color:var(--ink);}
.surface-ink{background:var(--ink);color:var(--snow);}
.surface-snow .eyebrow,.surface-paper .eyebrow{color:var(--deep-turquoise);}
.surface-ink .eyebrow{color:var(--amber);}

.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-mono);
  font-size:11.5px;font-weight:600;
  letter-spacing:.24em;text-transform:uppercase;
  color:var(--turquoise);
}
.eyebrow::before{
  content:"";width:22px;height:2px;border-radius:2px;
  background:currentColor;
}
.section-title{
  font-family:var(--font-display);
  font-weight:900;
  font-size:clamp(28px,4vw,48px);
  letter-spacing:.03em;
  line-height:1.06;
  margin-top:14px;
}
.lede{
  font-size:clamp(16px,1.35vw,18px);
  line-height:1.8;
  max-width:62ch;
  margin-top:16px;
  opacity:.82;
}
.mono{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  letter-spacing:.02em;
}
.divider{
  height:1px;border:0;
  background:var(--hair);
  margin-block:clamp(26px,4vw,46px);
}
.surface-snow .divider,.surface-paper .divider{background:var(--hair-ink);}

/* 语义标签：红=权益时间 绿=目录 金=下载范围 */
.tag{
  display:inline-flex;align-items:center;gap:8px;
  padding:6px 13px;border-radius:var(--r-pill);
  font-size:12px;font-weight:600;letter-spacing:.07em;
  border:1px solid transparent;
}
.tag::before{content:"";width:6px;height:6px;border-radius:50%;background:currentColor;}
.tag--red{background:rgba(199,58,43,.12);border-color:rgba(199,58,43,.4);color:var(--dark-cinnabar);}
.tag--green{background:rgba(23,122,107,.12);border-color:rgba(23,122,107,.4);color:var(--deep-turquoise);}
.tag--gold{background:rgba(201,162,75,.16);border-color:rgba(201,162,75,.5);color:#6B5320;}
.surface-ink .tag--red{background:rgba(199,58,43,.22);border-color:rgba(199,58,43,.55);color:#F3B7AE;}
.surface-ink .tag--green{background:rgba(23,122,107,.26);border-color:rgba(23,122,107,.6);color:#8FD6C8;}
.surface-ink .tag--gold{background:rgba(201,162,75,.18);border-color:rgba(201,162,75,.55);color:#EBD5A2;}

/* 按钮 */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  padding:14px 26px;border-radius:var(--r-pill);
  border:1px solid transparent;
  font-family:var(--font-body);
  font-size:15px;font-weight:700;letter-spacing:.05em;
  transition:background .25s var(--ease),color .25s var(--ease),border-color .25s var(--ease),transform .25s var(--ease);
}
.btn:hover{transform:translateY(-2px);}
.btn--primary{background:var(--cinnabar);color:#fff;}
.btn--primary:hover{background:var(--dark-cinnabar);}
.btn--gold{background:var(--gold);color:var(--ink);}
.btn--gold:hover{background:#B98F35;color:var(--ink);}
.btn--ghost{border-color:currentColor;background:transparent;color:inherit;}
.btn--ghost:hover{background:rgba(247,244,236,.12);}
.surface-snow .btn--ghost:hover,.surface-paper .btn--ghost:hover{background:rgba(14,27,42,.08);}

/* 面包屑 */
.breadcrumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  padding-block:18px 0;
  font-size:13px;letter-spacing:.02em;
  color:rgba(157,180,192,.95);
}
.surface-snow .breadcrumb,.surface-paper .breadcrumb{color:rgba(14,27,42,.6);}
.breadcrumb__sep{opacity:.45;}
.breadcrumb a{transition:color .25s var(--ease);}
.breadcrumb a:hover{color:var(--cinnabar);}
.breadcrumb [aria-current="page"]{color:inherit;font-weight:600;}

/* 栅格 */
.grid{display:grid;gap:clamp(16px,2.4vw,28px);}
.grid--2{grid-template-columns:1fr;}
.grid--3{grid-template-columns:1fr;}
.grid--auto{grid-template-columns:repeat(auto-fit,minmax(min(100%,280px),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:1020px){
  .grid--3{grid-template-columns:repeat(3,minmax(0,1fr));}
}

/* 正文 */
.prose{max-width:66ch;font-size:17px;line-height:1.85;}
.prose p + p{margin-top:1em;}
.prose h2{
  font-family:var(--font-display);
  font-size:clamp(22px,2.6vw,30px);
  letter-spacing:.03em;margin-top:1.8em;margin-bottom:.5em;
}
.prose h3{
  font-size:clamp(18px,2vw,22px);
  letter-spacing:.02em;margin-top:1.4em;margin-bottom:.4em;
}
.prose ul{list-style:none;display:flex;flex-direction:column;gap:.5em;margin-top:.8em;}
.prose ul li{padding-left:1.1em;position:relative;}
.prose ul li::before{
  content:"";position:absolute;left:0;top:.72em;
  width:7px;height:7px;border-radius:50%;
  background:var(--turquoise);
}

/* 图片容器（页面阶段放占位图） */
.media-frame{
  position:relative;overflow:hidden;
  border-radius:var(--r-lg);
  aspect-ratio:16 / 10;
  background:
    radial-gradient(120% 100% at 12% 0%, rgba(23,122,107,.55) 0%, rgba(23,122,107,0) 58%),
    linear-gradient(150deg,var(--deep-turquoise) 0%,var(--ink) 72%);
  border:1px solid rgba(201,162,75,.28);
}
.media-frame img{
  width:100%;height:100%;object-fit:cover;
  filter:saturate(.92) contrast(1.03);
}
.media-frame--wide{aspect-ratio:21 / 9;}
.media-frame--tall{aspect-ratio:4 / 5;}
.media-frame__caption{
  position:absolute;left:16px;right:16px;bottom:16px;
  font-family:var(--font-mono);
  font-size:11.5px;letter-spacing:.1em;
  color:rgba(247,244,236,.9);
  background:rgba(14,27,42,.62);
  border:1px solid rgba(201,162,75,.3);
  border-radius:var(--r-sm);
  padding:7px 12px;
  backdrop-filter:blur(2px);
}

/* 展签卡 */
.plate{
  position:relative;
  background:var(--paper);
  color:var(--ink);
  border-radius:var(--r-md);
  border-left:5px solid var(--gold);
  padding:22px 22px 20px;
  box-shadow:var(--lift);
}
.plate .mono{color:var(--dark-cinnabar);font-weight:600;}

/* 脉冲信号点 */
.signal{
  display:inline-block;width:10px;height:10px;border-radius:50%;
  background:var(--amber);
  animation:signal-pulse 2.6s var(--ease) infinite;
}
@keyframes signal-pulse{
  0%,100%{box-shadow:0 0 0 0 rgba(242,181,68,.55);}
  50%{box-shadow:0 0 0 9px rgba(242,181,68,0);}
}

/* 主题筛选 */
.filter-bar{
  display:flex;flex-wrap:wrap;gap:10px;
  margin-block:0 clamp(22px,3.4vw,32px);
}
.filter-chip{
  display:inline-flex;align-items:center;gap:8px;
  padding:9px 18px;border-radius:var(--r-pill);
  border:1px solid var(--hair-strong);
  font-size:13px;font-weight:600;letter-spacing:.06em;
  color:inherit;
  transition:background .25s var(--ease),border-color .25s var(--ease),color .25s var(--ease);
}
.filter-chip:hover{background:rgba(201,162,75,.16);}
.filter-chip.is-active{
  background:var(--turquoise);border-color:var(--turquoise);color:#fff;
}
.surface-ink .filter-chip.is-active{background:var(--turquoise);border-color:var(--turquoise);color:#fff;}
.is-hidden{display:none !important;}

/* 滚动显现 */
.reveal{
  opacity:0;transform:translateY(16px);
  transition:opacity .6s var(--ease),transform .6s var(--ease);
}
.reveal.is-visible{opacity:1;transform:none;}

/* 平板/手机收尾 */
@media (max-width:520px){
  .pill-link{padding:7px 12px;font-size:12px;}
  .nav-toggle{padding:9px 13px;letter-spacing:.08em;}
  .footer-base{flex-direction:column;align-items:flex-start;}
}

/* 减少动效 */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .reveal{opacity:1;transform:none;}
  .signal{animation:none;}
  .scroll-meter__bar{transition:none;}
}