/* =========================================================
   IM看台 · 共享站点样式 /assets/site.css
   夜间看台墨绿打底 · 荧光青导航高亮 · 电光橙当前标记
   ========================================================= */

/* ---------- 1. Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0}
h1,h2,h3,h4,h5,p,figure,dl,dd,blockquote{margin:0}
ul,ol{margin:0;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%}
hr{border:0;border-top:1px solid var(--line);margin:0}

/* ---------- 2. Tokens ---------- */
:root{
  --ink:#071A15;
  --ink-deep:#05120F;
  --panel:#0E2A23;
  --panel-deep:#0B211B;
  --moss:#1D4A3D;
  --stone:#5E6F68;
  --mist:#A9B7B0;
  --warm:#F4F1E8;
  --cyan:#6FF7E2;
  --orange:#FF7A2F;
  --clay:#C97A58;
  --ash:#D8E0DC;

  --line:rgba(169,183,176,.20);
  --line-strong:rgba(169,183,176,.38);
  --line-cyan:rgba(111,247,226,.34);
  --glass:rgba(14,42,35,.58);
  --glass-blur:blur(14px) saturate(1.15);

  --wrap:1240px;
  --gutter:clamp(18px,4vw,48px);

  --ff-display:"Barlow Condensed","Archivo Narrow","Oswald","Noto Sans SC","Source Han Sans SC",system-ui,sans-serif;
  --ff-body:"Noto Sans SC","Source Han Sans SC",-apple-system,"Segoe UI",system-ui,"Helvetica Neue",sans-serif;
  --ff-mono:"IBM Plex Mono","JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  --r-sm:4px;
  --r-md:10px;
  --r-lg:18px;

  --ease:cubic-bezier(.22,.61,.36,1);
  --dur:.5s;
}

/* ---------- 3. Base / 中文排版 ---------- */
body{
  min-height:100vh;
  font-family:var(--ff-body);
  font-size:16px;
  line-height:1.75;
  color:var(--warm);
  background:
    radial-gradient(1100px 640px at 80% -10%,rgba(111,247,226,.10),transparent 62%),
    radial-gradient(880px 560px at 4% 10%,rgba(255,122,47,.07),transparent 60%),
    radial-gradient(900px 900px at 50% 120%,rgba(29,74,61,.55),transparent 70%),
    var(--ink);
  background-attachment:fixed;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-wrap:break-word;
  word-break:normal;
  line-break:strict;
}

::selection{background:var(--cyan);color:#04140f}

:focus-visible{
  outline:2px solid var(--cyan);
  outline-offset:3px;
  border-radius:4px;
}

/* ---------- 4. 标题与索引字体 ---------- */
.t-display{
  font-family:var(--ff-display);
  font-weight:700;
  font-size:clamp(40px,6.4vw,84px);
  line-height:.94;
  letter-spacing:-.015em;
}
.t-h2{
  font-family:var(--ff-display);
  font-weight:700;
  font-size:clamp(28px,3.6vw,50px);
  line-height:1.06;
  letter-spacing:-.01em;
}
.t-h3{
  font-family:var(--ff-display);
  font-weight:600;
  font-size:clamp(20px,2.2vw,27px);
  line-height:1.22;
}
.mono{
  font-family:var(--ff-mono);
  font-feature-settings:"tnum" 1;
  letter-spacing:.02em;
}
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:.6em;
  font-family:var(--ff-mono);
  font-size:11px;
  font-weight:500;
  letter-spacing:.24em;
  text-transform:uppercase;
  color:var(--cyan);
}
.eyebrow::before{
  content:"";
  width:22px;
  height:1px;
  background:var(--cyan);
  opacity:.7;
}
.index-tag{
  display:inline-flex;
  align-items:center;
  padding:.24em .72em;
  font-family:var(--ff-mono);
  font-size:11px;
  letter-spacing:.16em;
  color:var(--mist);
  border:1px solid var(--line-strong);
  border-radius:999px;
  white-space:nowrap;
}

/* ---------- 5. 布局骨架 ---------- */
.wrap{
  width:100%;
  max-width:var(--wrap);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.section{padding-block:clamp(46px,6.5vw,96px)}
.section__head{
  display:flex;
  flex-wrap:wrap;
  align-items:flex-end;
  justify-content:space-between;
  gap:16px 28px;
  margin-bottom:clamp(22px,3vw,40px);
}
.grid{display:grid;gap:clamp(16px,2vw,26px)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--4{grid-template-columns:repeat(4,minmax(0,1fr))}
.grid--7-5{grid-template-columns:minmax(0,7fr) minmax(0,5fr)}

/* ---------- 6. 面板层（玻璃 / 实色 / 米灰） ---------- */
.panel{
  position:relative;
  border:1px solid var(--line);
  border-radius:var(--r-lg);
  padding:clamp(18px,2.4vw,32px);
}
.panel--glass{
  background:var(--glass);
  border-color:rgba(111,247,226,.16);
  backdrop-filter:var(--glass-blur);
  -webkit-backdrop-filter:var(--glass-blur);
}
.panel--solid{
  background:linear-gradient(165deg,var(--panel),var(--panel-deep));
  border-color:rgba(94,111,104,.34);
}
.panel--paper{
  background:var(--ash);
  color:#0A211A;
  border-color:transparent;
}
.panel--paper .index-tag{color:#1D4A3D;border-color:rgba(29,74,61,.34)}
.panel--paper .eyebrow{color:#1D4A3D}
.panel--paper .eyebrow::before{background:#1D4A3D}

/* ---------- 7. 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.6em;
  padding:.85em 1.6em;
  border:1px solid transparent;
  border-radius:999px;
  font-size:14px;
  font-weight:600;
  letter-spacing:.06em;
  line-height:1.2;
  cursor:pointer;
  transition:transform .22s var(--ease),background .22s var(--ease),color .22s var(--ease),border-color .22s var(--ease);
}
.btn--primary{background:var(--orange);color:#14100B}
.btn--primary:hover{background:#FF9459;transform:translateY(-2px)}
.btn--cyan{background:var(--cyan);color:#04140F}
.btn--cyan:hover{background:#9BFFF1;transform:translateY(-2px)}
.btn--ghost{border-color:var(--line-strong);color:var(--warm)}
.btn--ghost:hover{border-color:var(--cyan);color:var(--cyan);transform:translateY(-2px)}

/* ---------- 8. 面包屑 ---------- */
.breadcrumb{
  border-bottom:1px dashed var(--line);
  padding-block:14px;
}
.breadcrumb__list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:10px;
  font-family:var(--ff-mono);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--mist);
}
.breadcrumb__item{display:inline-flex;align-items:center;gap:10px}
.breadcrumb__item + .breadcrumb__item::before{
  content:"/";
  color:var(--stone);
}
.breadcrumb__link{transition:color .2s var(--ease)}
.breadcrumb__link:hover{color:var(--cyan)}
.breadcrumb__item[aria-current="page"]{color:var(--warm)}

/* ---------- 9. 正文容器 ---------- */
.prose{
  max-width:74ch;
  font-size:17px;
  line-height:1.85;
  color:var(--ash);
}
.prose p + p{margin-top:1.05em}
.prose h2{
  font-family:var(--ff-display);
  font-size:clamp(24px,2.6vw,34px);
  line-height:1.2;
  color:var(--warm);
  margin-top:1.8em;
  margin-bottom:.6em;
}
.prose h3{
  font-family:var(--ff-display);
  font-size:clamp(19px,2vw,24px);
  color:var(--warm);
  margin-top:1.5em;
  margin-bottom:.5em;
}
.prose a{
  color:var(--cyan);
  border-bottom:1px solid var(--line-cyan);
}
.prose ul,.prose ol{margin:1em 0;padding-left:1.4em;list-style:disc}
.prose ol{list-style:decimal}
.prose li + li{margin-top:.45em}

/* ---------- 10. 响应式图片容器基础规则 ---------- */
.media{
  position:relative;
  overflow:hidden;
  border-radius:var(--r-md);
  border:1px solid var(--line);
  aspect-ratio:16/9;
  background:
    radial-gradient(120% 90% at 28% 0%,rgba(111,247,226,.16),transparent 62%),
    linear-gradient(158deg,#143328,#081A15 70%);
}
.media img{
  width:100%;
  height:100%;
  object-fit:cover;
}
.media::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background:linear-gradient(180deg,transparent 52%,rgba(5,18,15,.58));
}
.media--wide{aspect-ratio:21/9}
.media--tall{aspect-ratio:4/5}
.media--square{aspect-ratio:1/1}
.media__caption{
  margin-top:10px;
  font-family:var(--ff-mono);
  font-size:11px;
  letter-spacing:.1em;
  color:var(--mist);
}

/* ---------- 11. 滚动显现协议 ---------- */
[data-reveal]{
  transition:opacity .55s var(--ease),transform .55s var(--ease);
  transition-delay:var(--reveal-delay,0ms);
}
.has-js [data-reveal]{opacity:0;transform:translateY(20px)}
.has-js [data-reveal].is-revealed{opacity:1;transform:none}

/* ---------- 12. 跳至主内容 ---------- */
.skip-link{
  position:absolute;
  left:16px;
  top:-70px;
  z-index:300;
  display:inline-block;
  padding:10px 20px;
  background:var(--cyan);
  color:#04140F;
  font-weight:700;
  font-size:14px;
  border-radius:0 0 10px 10px;
  transition:top .18s var(--ease);
}
.skip-link:focus{top:0}

/* ---------- 13. Header ---------- */
.site-header{
  position:relative;
  z-index:60;
  background:linear-gradient(180deg,rgba(14,42,35,.90),rgba(7,26,21,.94));
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}

.header-rail{
  background:rgba(5,18,15,.62);
  border-bottom:1px solid var(--line);
}
.header-rail__inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:14px;
  min-height:40px;
  padding-block:7px;
}
.header-rail__meta{
  font-family:var(--ff-mono);
  font-size:11px;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--mist);
}
.header-badge{
  display:inline-flex;
  align-items:center;
  gap:9px;
  padding:4px 13px;
  font-size:11px;
  letter-spacing:.1em;
  color:var(--warm);
  border:1px solid var(--line-cyan);
  border-radius:999px;
  background:rgba(111,247,226,.07);
  white-space:nowrap;
}
.header-badge__dot{
  width:6px;
  height:6px;
  border-radius:50%;
  background:var(--cyan);
  animation:badge-pulse 2.4s var(--ease) infinite;
}
.header-badge__time{
  font-family:var(--ff-mono);
  font-feature-settings:"tnum" 1;
  color:var(--cyan);
  letter-spacing:.06em;
}
@keyframes badge-pulse{
  0%{box-shadow:0 0 0 0 rgba(111,247,226,.55)}
  70%{box-shadow:0 0 0 7px rgba(111,247,226,0)}
  100%{box-shadow:0 0 0 0 rgba(111,247,226,0)}
}

.masthead{
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:8px;
  padding-block:clamp(16px,2.4vw,28px) clamp(12px,1.8vw,20px);
}
.masthead__brand{
  display:inline-flex;
  align-items:baseline;
  gap:.28em;
  font-family:var(--ff-display);
  font-weight:700;
  font-size:clamp(30px,4.2vw,50px);
  line-height:1;
  letter-spacing:.03em;
  color:var(--warm);
  transition:color .25s var(--ease);
}
.masthead__brand:hover{color:var(--cyan)}
.masthead__mark{
  display:inline-block;
  padding:.04em .26em .10em;
  background:var(--cyan);
  color:#04140F;
  border-radius:6px;
  font-size:.70em;
  letter-spacing:.05em;
  transform:translateY(-.06em);
}
.masthead__word{letter-spacing:.08em}
.masthead__tagline{
  font-family:var(--ff-mono);
  font-size:11px;
  letter-spacing:.30em;
  color:var(--mist);
  text-align:center;
}

.navbar{
  border-top:1px solid var(--line);
  background:rgba(7,26,21,.55);
}
.navbar__inner{
  position:relative;
  display:flex;
  align-items:center;
  justify-content:center;
  min-height:56px;
  padding-block:6px;
}
.site-nav{width:100%}
.site-nav__list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:center;
  gap:2px 4px;
}
.site-nav__item{display:block}
.site-nav__link{
  position:relative;
  display:inline-flex;
  align-items:center;
  padding:10px 15px;
  font-size:14px;
  font-weight:500;
  letter-spacing:.04em;
  color:var(--ash);
  border-radius:999px;
  transition:color .24s var(--ease),background .24s var(--ease);
}
.site-nav__link::after{
  content:"";
  position:absolute;
  left:15px;
  right:15px;
  bottom:5px;
  height:2px;
  background:var(--cyan);
  border-radius:2px;
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .3s var(--ease),background .24s var(--ease);
}
.site-nav__link:hover{color:var(--warm);background:rgba(111,247,226,.06)}
.site-nav__link:hover::after{transform:scaleX(1)}
.site-nav__link[aria-current="page"]{color:var(--cyan)}
.site-nav__link[aria-current="page"]::after{transform:scaleX(1);background:var(--orange)}

.nav-toggle{
  display:none;
  align-items:center;
  gap:10px;
  margin-left:auto;
  padding:9px 15px;
  font-family:var(--ff-mono);
  font-size:12px;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--warm);
  border:1px solid var(--line-strong);
  border-radius:9px;
  transition:border-color .2s var(--ease),color .2s var(--ease),background .2s var(--ease);
}
.nav-toggle:hover{border-color:var(--cyan);color:var(--cyan)}
.nav-toggle__bars{
  position:relative;
  display:block;
  width:18px;
  height:12px;
}
.nav-toggle__bars::before,
.nav-toggle__bars::after{
  content:"";
  position:absolute;
  left:0;
  right:0;
  height:2px;
  border-radius:2px;
  background:var(--cyan);
  transition:transform .3s var(--ease),top .3s var(--ease);
}
.nav-toggle__bars::before{top:0}
.nav-toggle__bars::after{top:10px}
.site-header[data-open] .nav-toggle{
  border-color:var(--cyan);
  background:rgba(111,247,226,.12);
}
.site-header[data-open] .nav-toggle__bars::before{top:5px;transform:rotate(45deg)}
.site-header[data-open] .nav-toggle__bars::after{top:5px;transform:rotate(-45deg)}

/* ---------- 14. Footer ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(40px,6vw,84px);
  background:linear-gradient(180deg,var(--panel-deep),var(--ink-deep));
  border-top:1px solid var(--line);
}
.footer-top{
  display:grid;
  grid-template-columns:minmax(0,1.5fr) minmax(0,.85fr) minmax(0,.85fr) minmax(0,1.4fr);
  gap:clamp(24px,4vw,56px);
  padding-block:clamp(38px,5vw,72px);
}
.footer-brand__link{
  display:inline-flex;
  align-items:baseline;
  gap:.26em;
  font-family:var(--ff-display);
  font-weight:700;
  font-size:32px;
  line-height:1;
  letter-spacing:.04em;
  color:var(--warm);
  transition:color .22s var(--ease);
}
.footer-brand__link:hover{color:var(--cyan)}
.footer-brand__mark{
  display:inline-block;
  padding:.04em .26em .10em;
  background:var(--cyan);
  color:#04140F;
  border-radius:5px;
  font-size:.70em;
  transform:translateY(-.06em);
}
.footer-brand__word{letter-spacing:.08em}
.footer-brand__note{
  margin-top:16px;
  max-width:34ch;
  font-size:14px;
  line-height:1.8;
  color:var(--mist);
}
.footer-brand__meta{
  display:inline-block;
  margin-top:18px;
  padding:5px 12px;
  font-family:var(--ff-mono);
  font-size:11px;
  letter-spacing:.14em;
  color:var(--cyan);
  border:1px solid var(--line-cyan);
  border-radius:999px;
  background:rgba(111,247,226,.06);
}
.footer-col__title{
  margin-bottom:16px;
  font-family:var(--ff-mono);
  font-weight:500;
  font-size:11px;
  letter-spacing:.24em;
  text-transform:uppercase;
  color:var(--mist);
}
.footer-col__list{display:grid;gap:10px}
.footer-col__list a{
  display:inline-block;
  font-size:14px;
  color:var(--ash);
  border-bottom:1px solid transparent;
  transition:color .2s var(--ease),border-color .2s var(--ease),transform .2s var(--ease);
}
.footer-col__list a:hover{
  color:var(--cyan);
  border-bottom-color:var(--line-cyan);
  transform:translateX(4px);
}

.footer-contact__list{display:grid;gap:16px}
.footer-contact__row{display:block}
.footer-contact__row dt{
  font-family:var(--ff-mono);
  font-size:10px;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--stone);
}
.footer-contact__row dd{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  margin:3px 0 0;
}
.footer-contact__value{
  font-size:14px;
  line-height:1.6;
  color:var(--ash);
}
.footer-contact__value.mono{font-size:13px;letter-spacing:.06em;color:var(--warm)}
.footer-contact__note{
  margin-top:18px;
  padding-top:14px;
  border-top:1px dashed var(--line);
  font-size:12px;
  line-height:1.7;
  color:var(--stone);
  max-width:38ch;
}
.copy-btn{
  display:inline-flex;
  align-items:center;
  padding:3px 11px;
  font-family:var(--ff-mono);
  font-size:10px;
  letter-spacing:.14em;
  color:var(--cyan);
  border:1px solid var(--line-cyan);
  border-radius:999px;
  transition:background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease);
}
.copy-btn:hover{background:rgba(111,247,226,.14)}
.copy-btn[data-copied]{
  background:var(--cyan);
  color:#04140F;
  border-color:var(--cyan);
}

.footer-bottom{
  border-top:1px solid var(--line);
  background:rgba(5,18,15,.66);
}
.footer-bottom__inner{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:12px 24px;
  padding-block:18px;
}
.footer-bottom__legal{
  font-family:var(--ff-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--mist);
}
.footer-bottom__links{
  display:flex;
  flex-wrap:wrap;
  gap:8px 20px;
  font-size:13px;
  color:var(--ash);
}
.footer-bottom__links a{
  color:var(--ash);
  transition:color .2s var(--ease);
}
.footer-bottom__links a:hover{color:var(--cyan)}

.to-top{
  position:fixed;
  right:clamp(14px,3vw,28px);
  bottom:clamp(14px,3vw,28px);
  z-index:90;
  display:grid;
  place-items:center;
  width:46px;
  height:46px;
  font-size:17px;
  line-height:1;
  color:var(--cyan);
  background:rgba(14,42,35,.88);
  border:1px solid var(--line-cyan);
  border-radius:50%;
  backdrop-filter:blur(8px);
  -webkit-backdrop-filter:blur(8px);
  opacity:0;
  transform:translateY(12px);
  pointer-events:none;
  transition:opacity .3s var(--ease),transform .3s var(--ease),background .2s var(--ease);
}
.to-top[data-visible]{
  opacity:1;
  transform:none;
  pointer-events:auto;
}
.to-top:hover{background:rgba(111,247,226,.18)}

/* ---------- 15. 断点：平板 ---------- */
@media (max-width:1000px){
  .footer-top{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-contact__note{max-width:none}
}

@media (max-width:900px){
  .grid--3,.grid--4{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid--7-5{grid-template-columns:minmax(0,1fr)}

  .navbar__inner{justify-content:flex-end;min-height:54px;padding-block:10px}
  .nav-toggle{display:inline-flex}
  .site-nav{
    display:none;
    position:absolute;
    left:calc(var(--gutter) * -1);
    right:calc(var(--gutter) * -1);
    top:100%;
    padding:8px var(--gutter) 16px;
    background:var(--panel-deep);
    border-top:1px solid var(--line);
    border-bottom:1px solid var(--line-strong);
    box-shadow:0 26px 50px rgba(0,0,0,.5);
  }
  .site-header[data-open] .site-nav{display:block}
  .site-nav__list{flex-direction:column;align-items:stretch;gap:2px}
  .site-nav__link{
    justify-content:flex-start;
    width:100%;
    padding:12px 14px;
    border-radius:9px;
    font-size:15px;
  }
  .site-nav__link::after{left:14px;right:auto;width:18px;bottom:9px}
  .site-nav__link:hover{background:rgba(111,247,226,.09)}
  .site-nav__link[aria-current="page"]{background:rgba(255,122,47,.12)}
}

/* ---------- 16. 断点：手机 ---------- */
@media (max-width:620px){
  body{font-size:16px}
  .header-rail__inner{flex-wrap:wrap;justify-content:center;gap:6px 12px;padding-block:8px}
  .header-rail__meta{font-size:10px;letter-spacing:.16em}
  .header-badge{font-size:10px;padding:3px 10px}
  .masthead__tagline{font-size:10px;letter-spacing:.2em}
  .grid--2,.grid--3,.grid--4{grid-template-columns:minmax(0,1fr)}
  .footer-top{grid-template-columns:minmax(0,1fr);gap:30px}
  .footer-bottom__inner{flex-direction:column;align-items:flex-start}
  .footer-brand__note{max-width:none}
  .section__head{flex-direction:column;align-items:flex-start}
  .to-top{width:42px;height:42px}
}

/* ---------- 17. 减弱动效 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .has-js [data-reveal]{opacity:1;transform:none}
  .to-top{transform:none}
}