/* ===================================================================
   /assets/site.css — 共享层：reset、变量、中文排版、页头、页脚、
   通用按钮、面包屑、正文容器、网格与基础组件
   =================================================================== */

:root{
  --ink:#0B1F1A;
  --char:#101314;
  --moss:#1C2B26;
  --cyan:#4DF5D2;
  --orange:#FF9A3C;
  --cream:#F3EFE4;
  --mist:#C9D2CC;
  --slate:#6F8A83;
  --dark-ink:#12181A;

  --line:rgba(201,210,204,.16);
  --line-soft:rgba(201,210,204,.09);
  --line-strong:rgba(201,210,204,.32);
  --cyan-line:rgba(77,245,210,.34);

  --font-display:"Barlow Condensed","Oswald","Noto Sans SC",system-ui,sans-serif;
  --font-serif:"Noto Serif SC","Source Han Serif SC","Songti SC",serif;
  --font-body:"Noto Sans SC","Source Han Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono","Roboto Mono",ui-monospace,SFMono-Regular,Menlo,monospace;

  --shell:1360px;
  --gutter:clamp(16px,4vw,48px);
  --bento-gap:clamp(10px,1.2vw,16px);
  --ease:cubic-bezier(.2,.7,.3,1);
}

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box;}
html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:24px;
}
body{
  margin:0;
  background:var(--ink);
  color:var(--cream);
  font-family:var(--font-body);
  font-size:16px;
  font-weight:400;
  line-height:1.8;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
@media (min-width:960px){ body{font-size:17px;} }

img,svg,video,canvas{display:block;max-width:100%;height:auto;}
a{color:inherit;text-decoration:none;}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer;}
ul,ol{margin:0;padding:0;list-style:none;}
h1,h2,h3,h4,h5,p,figure,blockquote,dl,dd{margin:0;}
hr{border:0;border-top:1px solid var(--line);margin:0;}

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

/* ---------- 中文排版 ---------- */
h1,h2,h3,h4{
  font-family:var(--font-display);
  font-weight:800;
  line-height:1.14;
  letter-spacing:.01em;
  color:var(--cream);
  text-wrap:balance;
}
h1{font-size:clamp(34px,5vw,62px);}
h2{font-size:clamp(26px,3.2vw,40px);}
h3{font-size:clamp(19px,2.1vw,26px);}
h4{font-size:clamp(16px,1.5vw,19px);}
p{line-height:1.85;text-wrap:pretty;}
strong{font-weight:700;color:var(--cream);}
small{font-size:13px;}

.mono{font-family:var(--font-mono);letter-spacing:.06em;}
.serif{font-family:var(--font-serif);font-weight:600;}
.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;
}

/* ---------- 容器 ---------- */
.shell{
  width:100%;
  max-width:var(--shell);
  margin-inline:auto;
  padding-inline:var(--gutter);
}

/* ---------- 跳过链接 ---------- */
.skip-link{
  position:absolute;
  left:16px;
  top:-80px;
  z-index:400;
  padding:10px 18px;
  background:var(--cyan);
  color:var(--char);
  font-family:var(--font-mono);
  font-size:13px;
  font-weight:700;
  letter-spacing:.08em;
  transition:top .2s var(--ease);
}
.skip-link:focus{top:12px;}

/* ===================================================================
   页头
   =================================================================== */
.site-header{
  position:relative;
  z-index:80;
  color:var(--cream);
  background:
    radial-gradient(120% 150% at 10% -40%, rgba(77,245,210,.15), transparent 58%),
    linear-gradient(180deg,#0d241f 0%, var(--ink) 64%);
  border-bottom:1px solid var(--line-strong);
}

.header-frame{position:relative;}
.header-frame::before,
.header-frame::after{
  content:"";
  position:absolute;
  top:0;bottom:0;
  width:1px;
  pointer-events:none;
  background:linear-gradient(180deg,var(--cyan-line) 0%,var(--line-soft) 32%,var(--line-soft) 68%,transparent 100%);
}
.header-frame::before{left:0;}
.header-frame::after{right:0;}

/* 顶部索引条 */
.header-rail{
  display:flex;
  align-items:center;
  gap:clamp(10px,1.6vw,18px);
  padding-block:9px;
  padding-inline:2px;
  border-bottom:1px solid var(--line-soft);
}
.rail-dot{
  flex:0 0 auto;
  width:7px;height:7px;
  background:var(--orange);
  box-shadow:0 0 0 3px rgba(255,154,60,.16);
}
.brand-line{
  font-family:var(--font-serif);
  font-size:13px;
  font-weight:600;
  letter-spacing:.06em;
  color:var(--mist);
  white-space:nowrap;
}
.rail-rule{
  flex:1 1 auto;
  min-width:20px;
  height:1px;
  background:linear-gradient(90deg,var(--line-strong),transparent);
}
.rail-meta{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  color:var(--slate);
  white-space:nowrap;
}

/* 主导入条 */
.header-main{
  position:relative;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:clamp(14px,3vw,40px);
  padding-block:12px;
}

.brand{
  display:inline-flex;
  align-items:center;
  gap:12px;
  min-width:0;
}
.brand-mark{
  display:grid;
  place-items:center;
  flex:0 0 auto;
  width:40px;height:40px;
  border:1px solid var(--cyan-line);
  background:linear-gradient(160deg,rgba(77,245,210,.16),transparent 72%);
  color:var(--cyan);
  font-family:var(--font-mono);
  font-size:15px;
  font-weight:700;
  letter-spacing:.04em;
  transition:border-color .2s var(--ease),color .2s var(--ease);
}
.brand:hover .brand-mark{border-color:var(--cyan);color:var(--cream);}
.brand-text{display:grid;gap:2px;min-width:0;}
.brand-name{
  display:block;
  font-family:var(--font-display);
  font-weight:800;
  font-size:21px;
  line-height:1.1;
  letter-spacing:.04em;
  color:var(--cream);
}
.brand-sub{
  display:block;
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.22em;
  color:var(--slate);
}

/* 移动导航按钮 */
.nav-toggle{
  display:none;
  align-items:center;
  gap:10px;
  padding:10px 14px;
  border:1px solid var(--cyan-line);
  background:rgba(28,43,38,.92);
  color:var(--cream);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.16em;
  transition:border-color .2s var(--ease),background .2s var(--ease);
}
.nav-toggle:hover{border-color:var(--cyan);background:rgba(77,245,210,.1);}
.nav-toggle-bars{
  position:relative;
  display:block;
  width:18px;height:11px;
}
.nav-toggle-bars::before,
.nav-toggle-bars::after{
  content:"";
  position:absolute;left:0;right:0;
  height:1px;
  background:var(--cyan);
  transition:transform .22s var(--ease),opacity .22s 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(5px) rotate(45deg);}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after{transform:translateY(-5px) rotate(-45deg);}
.nav-toggle-label{white-space:nowrap;}

/* 导航 */
.nav-list{display:flex;align-items:stretch;gap:2px;}
.nav-list li{position:relative;}
.nav-list a{
  position:relative;
  display:block;
  padding:12px 15px;
  font-size:15px;
  font-weight:500;
  letter-spacing:.03em;
  color:var(--mist);
  transition:color .2s var(--ease),background .2s var(--ease);
}
.nav-list a::after{
  content:"";
  position:absolute;
  left:15px;right:15px;bottom:6px;
  height:2px;
  background:var(--cyan);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .24s var(--ease);
}
.nav-list a:hover{color:var(--cream);background:rgba(77,245,210,.07);}
.nav-list a:hover::after{transform:scaleX(1);}
.nav-list a[aria-current="page"]{
  color:var(--cyan);
  background:rgba(77,245,210,.06);
}
.nav-list a[aria-current="page"]::after{
  transform:scaleX(1);
  box-shadow:0 0 10px rgba(77,245,210,.55);
}

@media (min-width:960px){
  .site-nav{
    position:relative;
    padding-left:16px;
    border-left:1px solid var(--line-strong);
  }
  .site-nav::before,
  .site-nav::after{
    content:"";
    position:absolute;
    left:-1px;
    width:7px;height:7px;
    pointer-events:none;
  }
  .site-nav::before{
    top:-6px;
    border-left:1px solid var(--cyan);
    border-top:1px solid var(--cyan);
  }
  .site-nav::after{
    bottom:-6px;
    border-left:1px solid var(--cyan);
    border-bottom:1px solid var(--cyan);
  }
}

/* 移动端导航 */
@media (max-width:959px){
  .nav-toggle{display:inline-flex;}

  .site-nav{
    position:absolute;
    top:100%;
    left:0;
    right:0;
    margin-top:12px;
    display:none;
    z-index:120;
    padding:8px;
    background:var(--char);
    border:1px solid rgba(77,245,210,.22);
    border-top:2px solid var(--cyan);
    box-shadow:0 24px 56px rgba(0,0,0,.6);
    max-height:min(72vh,540px);
    overflow-y:auto;
    overscroll-behavior:contain;
  }
  .site-nav[data-open]{
    display:block;
    animation:navDrop .22s var(--ease) both;
  }
  .nav-list{flex-direction:column;gap:2px;}
  .nav-list a{
    padding:14px 16px;
    font-size:16px;
    border:1px solid rgba(201,210,204,.1);
    background:rgba(28,43,38,.55);
  }
  .nav-list a::after{
    left:0;
    right:auto;
    top:0;
    bottom:0;
    width:3px;
    height:auto;
    transform:scaleY(0);
    transform-origin:top center;
  }
  .nav-list a:hover::after,
  .nav-list a[aria-current="page"]::after{transform:scaleY(1);}
}

@keyframes navDrop{
  from{opacity:0;transform:translateY(-8px);}
  to{opacity:1;transform:translateY(0);}
}

@media (max-width:767px){
  .rail-meta{display:none;}
  .brand-name{font-size:19px;}
  .brand-mark{width:36px;height:36px;font-size:14px;}
}

/* ===================================================================
   页脚
   =================================================================== */
.site-footer{
  position:relative;
  margin-top:clamp(32px,5vw,64px);
  background:var(--char);
  color:var(--mist);
  border-top:1px solid rgba(77,245,210,.3);
  overflow:hidden;
}
.site-footer::before{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background-image:linear-gradient(90deg,rgba(111,138,131,.14) 1px,transparent 1px);
  background-size:96px 100%;
  opacity:.55;
}
.site-footer > .shell{position:relative;z-index:1;}

.footer-top{
  display:grid;
  grid-template-columns:1.5fr 1fr 1fr 1.5fr;
  gap:clamp(22px,3vw,44px);
  padding-block:clamp(34px,5vw,60px) clamp(22px,3vw,34px);
}

.footer-brand{display:grid;gap:12px;align-content:start;}
.footer-tag{
  font-family:var(--font-serif);
  font-size:14px;
  font-weight:600;
  letter-spacing:.06em;
  color:var(--mist);
}
.footer-coord{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.2em;
  color:var(--slate);
}

.footer-heading{
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:500;
  letter-spacing:.22em;
  color:var(--slate);
  margin-bottom:14px;
  padding-bottom:10px;
  border-bottom:1px solid var(--line);
}

.footer-links{display:grid;}
.footer-links a{
  display:flex;
  align-items:center;
  gap:9px;
  padding:8px 0;
  font-size:15px;
  color:var(--mist);
  border-bottom:1px dashed rgba(201,210,204,.13);
  transition:color .2s var(--ease),padding-left .2s var(--ease);
}
.footer-links a::before{
  content:"";
  flex:0 0 auto;
  width:6px;height:1px;
  background:var(--slate);
  transition:width .2s var(--ease),background .2s var(--ease);
}
.footer-links a:hover{color:var(--cyan);padding-left:6px;}
.footer-links a:hover::before{width:14px;background:var(--cyan);}
.footer-links a[aria-current="page"]{color:var(--cyan);}
.footer-links a[aria-current="page"]::before{width:14px;background:var(--cyan);}

.contact-list{display:grid;gap:12px;}
.contact-list li{
  display:grid;
  gap:2px;
  padding-bottom:10px;
  border-bottom:1px solid var(--line-soft);
}
.contact-label{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.2em;
  color:var(--slate);
}
.contact-value{
  font-size:15px;
  color:var(--cream);
  word-break:break-word;
}
.contact-note{
  margin-top:12px;
  font-size:13px;
  line-height:1.8;
  color:var(--slate);
}

/* 四格说明 */
.footer-notes{
  display:grid;
  grid-template-columns:repeat(4,minmax(0,1fr));
  gap:1px;
  margin-bottom:clamp(22px,3vw,36px);
  background:rgba(201,210,204,.16);
  border:1px solid rgba(201,210,204,.16);
}
.footer-note{
  position:relative;
  background:var(--moss);
  padding:20px 18px 24px;
}
.footer-note::before{
  content:"";
  position:absolute;
  left:0;top:0;
  width:22px;height:2px;
  background:var(--cyan);
  opacity:.65;
}
.note-num{
  display:block;
  margin-bottom:8px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.22em;
  color:var(--orange);
}
.footer-note h3{
  font-family:var(--font-display);
  font-size:18px;
  font-weight:700;
  letter-spacing:.05em;
  margin-bottom:8px;
  color:var(--cream);
}
.footer-note p{
  font-size:13.5px;
  line-height:1.85;
  color:var(--mist);
}

.footer-bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:8px 24px;
  padding-block:16px 26px;
  border-top:1px solid var(--line);
  font-size:13px;
  color:var(--slate);
}
.footer-copy{font-size:13px;}
.footer-icp{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.1em;
  color:var(--mist);
}

@media (max-width:1023px){
  .footer-top{grid-template-columns:1fr 1fr;}
  .footer-brand{grid-column:1 / -1;}
  .footer-notes{grid-template-columns:1fr 1fr;}
}
@media (max-width:639px){
  .footer-top{grid-template-columns:1fr;}
  .footer-notes{grid-template-columns:1fr;}
  .footer-bottom{justify-content:flex-start;}
}

/* ===================================================================
   通用组件
   =================================================================== */

/* 按钮 */
.btn{
  position:relative;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  padding:13px 22px;
  overflow:hidden;
  border:1px solid transparent;
  font-family:var(--font-body);
  font-size:15px;
  font-weight:500;
  letter-spacing:.04em;
  line-height:1.2;
  color:var(--cream);
  transition:background .2s var(--ease),color .2s var(--ease),
             border-color .2s var(--ease),transform .2s var(--ease);
}
.btn:hover{transform:translateY(-1px);}
.btn--primary{
  background:var(--cyan);
  border-color:var(--cyan);
  color:var(--char);
  font-weight:700;
}
.btn--primary:hover{background:#6ff9de;border-color:#6ff9de;}
.btn--ghost{
  background:transparent;
  border-color:var(--cyan-line);
  color:var(--cyan);
}
.btn--ghost:hover{background:rgba(77,245,210,.12);border-color:var(--cyan);}
.btn--orange{
  background:transparent;
  border-color:rgba(255,154,60,.5);
  color:var(--orange);
}
.btn--orange:hover{background:rgba(255,154,60,.14);border-color:var(--orange);}
.btn--scan::after{
  content:"";
  position:absolute;
  inset:-40% -70%;
  pointer-events:none;
  background:linear-gradient(105deg,transparent 42%,rgba(77,245,210,.4) 50%,transparent 58%);
  transform:translateX(-120%);
  transition:transform .8s var(--ease);
}
.btn--primary.btn--scan::after{
  background:linear-gradient(105deg,transparent 42%,rgba(255,255,255,.55) 50%,transparent 58%);
}
.btn--scan:hover::after{transform:translateX(120%);}

/* 面包屑 */
.crumbs{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  padding-block:16px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.14em;
  color:var(--slate);
}
.crumbs li{display:flex;align-items:center;gap:8px;}
.crumbs li + li::before{content:"/";color:var(--slate);opacity:.7;}
.crumbs a{color:var(--mist);transition:color .2s var(--ease);}
.crumbs a:hover{color:var(--cyan);}
.crumbs [aria-current="page"]{color:var(--cyan);}

/* 米白阅读区 */
.panel-cream{
  background:var(--cream);
  color:var(--dark-ink);
  padding-block:clamp(32px,5vw,68px);
}
.panel-cream h1,
.panel-cream h2,
.panel-cream h3,
.panel-cream h4{color:var(--dark-ink);}
.panel-cream a{color:#0a5f52;}
.panel-cream a:hover{color:#083f37;text-decoration:underline;text-underline-offset:3px;}
.panel-cream .eyebrow{color:#0a6a5b;}
.reading{max-width:72ch;}
.reading > * + *{margin-top:1em;}
.reading p + p{margin-top:1.1em;}

/* 网格 */
.grid{display:grid;gap:var(--bento-gap);}
.cols-2{grid-template-columns:repeat(2,minmax(0,1fr));}
.cols-3{grid-template-columns:repeat(3,minmax(0,1fr));}
.cols-4{grid-template-columns:repeat(4,minmax(0,1fr));}

/* 卡片 */
.card{
  position:relative;
  background:var(--moss);
  border:1px solid var(--line);
  padding:clamp(16px,2vw,26px);
}
.card--cream{
  background:var(--cream);
  color:var(--dark-ink);
  border-color:rgba(18,24,26,.14);
}
.card--cream h2,.card--cream h3,.card--cream h4{color:var(--dark-ink);}
.card--focus{
  border-color:rgba(77,245,210,.42);
  box-shadow:inset 0 0 0 1px rgba(77,245,210,.1);
}

/* 标签与眉题 */
.eyebrow{
  display:inline-block;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.2em;
  color:var(--cyan);
}
.eyebrow--orange{color:var(--orange);}
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 10px;
  border:1px solid var(--line-strong);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  color:var(--mist);
}
.tag--cyan{border-color:var(--cyan-line);color:var(--cyan);}
.tag--orange{border-color:rgba(255,154,60,.45);color:var(--orange);}

/* 图片容器基础规则 */
.media{
  position:relative;
  overflow:hidden;
  background:var(--moss);
  border:1px solid var(--line);
  aspect-ratio:16/10;
}
.media img{
  width:100%;
  height:100%;
  object-fit:cover;
  filter:saturate(.9) contrast(1.06) brightness(.92);
}
.media::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background-image:
    linear-gradient(90deg,rgba(77,245,210,.14) 1px,transparent 1px),
    linear-gradient(0deg,rgba(77,245,210,.14) 1px,transparent 1px);
  background-size:48px 48px;
  opacity:.5;
  mix-blend-mode:screen;
}
.media--portrait{aspect-ratio:4/5;}
.media--square{aspect-ratio:1/1;}
.media--wide{aspect-ratio:21/9;}
.media-caption{
  margin-top:8px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.12em;
  color:var(--slate);
}

/* 可展开内容组 */
.disclosure-btn{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:14px;
  width:100%;
  padding:14px 16px;
  background:var(--moss);
  border:1px solid var(--line);
  color:var(--cream);
  font-family:var(--font-body);
  font-size:15px;
  font-weight:500;
  text-align:left;
  transition:border-color .2s var(--ease),background .2s var(--ease);
}
.disclosure-btn:hover{border-color:var(--cyan-line);background:rgba(77,245,210,.07);}
.disclosure-btn::after{
  content:"+";
  flex:0 0 auto;
  font-family:var(--font-mono);
  font-size:16px;
  color:var(--cyan);
  transition:transform .2s var(--ease);
}
.disclosure-btn[aria-expanded="true"]::after{transform:rotate(45deg);}
.disclosure-panel{
  display:none;
  padding:14px 16px 18px;
  border:1px solid var(--line-soft);
  border-top:0;
  background:rgba(16,19,20,.5);
  font-size:15px;
  color:var(--mist);
}
.disclosure-panel[data-open]{display:block;}

/* 阅读进度条 */
.scroll-progress{
  position:fixed;
  top:0;left:0;
  width:100%;height:2px;
  transform:scaleX(0);
  transform-origin:0 50%;
  background:linear-gradient(90deg,var(--cyan),var(--orange));
  box-shadow:0 0 12px rgba(77,245,210,.45);
  z-index:400;
  pointer-events:none;
}

/* ---------- 响应式 ---------- */
@media (max-width:900px){
  .cols-3,.cols-4{grid-template-columns:repeat(2,minmax(0,1fr));}
}
@media (max-width:600px){
  .cols-2,.cols-3,.cols-4{grid-template-columns:1fr;}
  .btn{width:100%;}
}

/* ---------- 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;
    scroll-behavior:auto !important;
  }
  .btn--scan::after{display:none;}
  .scroll-progress{box-shadow:none;}
}