/* ============================================================
   亿万28链接 · 共享样式表 /assets/site.css
   深夜数据港 × 导航灯塔：深靛蓝底 + 电光青 + 霓虹橙 + 暖金
   ============================================================ */

/* ---------- 变量 ---------- */
:root{
  --ink-900:#05081a;
  --ink-850:#070b21;
  --ink-800:#0a1030;
  --ink-750:#0d1540;
  --line:rgba(118,158,224,.20);
  --line-strong:rgba(130,180,255,.38);
  --paper:#f3ece0;
  --text:#d7e2ff;
  --text-dim:#94a6d0;
  --text-mute:#6b7cab;
  --cyan:#3ee0ff;
  --cyan-deep:#1b93c4;
  --orange:#ff6a2b;
  --orange-soft:#ff9c62;
  --gold:#e9c258;
  --shadow-deep:0 34px 80px -46px rgba(0,0,0,.95);
  --wrap:1180px;
  --radius:3px;
  --font-sans:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,"Liberation Mono",monospace;
}

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{
  -webkit-text-size-adjust:100%;
  text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:132px;
}
body,h1,h2,h3,h4,h5,p,figure,blockquote,dl,dd{margin:0}
ul,ol{margin:0;padding:0}
ul[class],ol[class]{list-style:none}
img,picture,svg,video,canvas{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}
h1,h2,h3,h4{line-height:1.24;letter-spacing:-.01em}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:2px}
::selection{background:rgba(255,106,43,.42);color:#fff}

/* ---------- 基底 ---------- */
body{
  position:relative;
  background:var(--ink-900);
  color:var(--text);
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.75;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:-2;
  background:
    radial-gradient(880px 560px at 8% -12%, rgba(62,224,255,.16), transparent 62%),
    radial-gradient(700px 520px at 96% 4%, rgba(255,106,43,.12), transparent 64%),
    radial-gradient(920px 700px at 50% 118%, rgba(233,194,88,.08), transparent 70%),
    linear-gradient(180deg,#05081a 0%,#04060f 55%,#060a1e 100%);
}
body::after{
  content:"";
  position:fixed;
  inset:0;
  z-index:-1;
  pointer-events:none;
  opacity:.55;
  background-image:
    linear-gradient(rgba(118,158,224,.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(118,158,224,.06) 1px, transparent 1px);
  background-size:64px 64px,64px 64px;
  -webkit-mask-image:radial-gradient(circle at 50% 26%, rgba(0,0,0,.92), transparent 78%);
  mask-image:radial-gradient(circle at 50% 26%, rgba(0,0,0,.92), transparent 78%);
}
#main-content{display:block;scroll-margin-top:130px}

/* ---------- 布局工具 ---------- */
.wrap{
  width:100%;
  max-width:var(--wrap);
  margin-inline:auto;
  padding-inline:clamp(18px,4vw,46px);
}
.stack{display:grid;gap:clamp(20px,3vw,38px)}
.grid{display:grid;gap:clamp(16px,2.4vw,30px)}
.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))}
.rule{height:1px;border:0;background:linear-gradient(90deg,var(--line-strong),transparent)}

/* ---------- 滚动进度 ---------- */
.scroll-progress{
  position:fixed;
  top:0;
  left:0;
  width:100%;
  height:2px;
  z-index:200;
  pointer-events:none;
  transform:scaleX(0);
  transform-origin:0 50%;
  background:linear-gradient(90deg,var(--gold),var(--orange) 45%,var(--cyan));
  will-change:transform;
}
.scroll-progress[data-state="idle"]{opacity:.22}

/* ---------- 跳转链接 ---------- */
.skip-link{
  position:absolute;
  left:-9999px;
  top:0;
  z-index:300;
  display:inline-block;
  padding:10px 18px;
  background:var(--gold);
  color:#0a0f22;
  font-weight:700;
  letter-spacing:.1em;
  text-decoration:none;
  border-radius:0 0 var(--radius) 0;
}
.skip-link:focus{left:0}

/* ============================================================
   页头：框架式导航，导航即边框
   ============================================================ */
.site-header{
  position:sticky;
  top:0;
  z-index:120;
  background:rgba(5,8,26,.88);
  border-bottom:1px solid var(--line-strong);
  -webkit-backdrop-filter:blur(16px) saturate(150%);
  backdrop-filter:blur(16px) saturate(150%);
  box-shadow:0 20px 44px -36px rgba(0,0,0,1);
  transition:background .3s ease,box-shadow .3s ease;
}
.site-header[data-scrolled="true"]{
  background:rgba(4,7,22,.96);
  box-shadow:0 24px 52px -32px rgba(0,0,0,1),0 1px 0 rgba(62,224,255,.24);
}

/* 机读条 */
.header-rail{
  border-bottom:1px solid var(--line);
  background:linear-gradient(90deg,rgba(62,224,255,.10),rgba(255,106,43,.09) 55%,rgba(233,194,88,.08));
}
.header-rail-inner{
  display:flex;
  align-items:center;
  gap:16px;
  min-height:34px;
}
.rail-item{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--text-mute);
  white-space:nowrap;
}
.rail-item--ping{
  display:inline-flex;
  align-items:center;
  gap:8px;
  color:rgba(62,224,255,.72);
}
.rail-dots{
  flex:1 1 auto;
  min-width:20px;
  height:1px;
  background-image:repeating-linear-gradient(90deg,var(--line-strong) 0 5px,transparent 5px 11px);
}
.rail-ping{
  width:6px;
  height:6px;
  border-radius:50%;
  background:var(--cyan);
  box-shadow:0 0 8px rgba(62,224,255,.9);
}
@media (prefers-reduced-motion:no-preference){
  .rail-ping{animation:railPulse 2.6s ease-in-out infinite}
}
@keyframes railPulse{
  0%,100%{opacity:1;transform:scale(1)}
  50%{opacity:.35;transform:scale(.72)}
}

/* 框架层 */
.header-frame{position:relative}
.header-inner{
  display:flex;
  align-items:center;
  gap:20px;
  min-height:76px;
}

/* 品牌 */
.brand{
  display:inline-flex;
  align-items:center;
  gap:12px;
  flex:0 0 auto;
  color:var(--paper);
  text-decoration:none;
}
.brand-mark{
  display:grid;
  place-items:center;
  width:42px;
  height:42px;
  font-family:var(--font-mono);
  font-size:14px;
  font-weight:700;
  letter-spacing:.02em;
  color:var(--cyan);
  background:linear-gradient(150deg,#12234f,#080f2a);
  border:1px solid rgba(62,224,255,.55);
  border-radius:var(--radius);
  box-shadow:inset 0 0 20px rgba(62,224,255,.16),0 10px 24px -14px rgba(62,224,255,.85);
  transition:transform .35s ease,box-shadow .35s ease;
}
.brand:hover .brand-mark{
  transform:translateY(-2px);
  box-shadow:inset 0 0 26px rgba(62,224,255,.28),0 16px 30px -14px rgba(62,224,255,.95);
}
.brand-text{display:flex;flex-direction:column;gap:2px;line-height:1.12}
.brand-name{font-size:19px;font-weight:800;letter-spacing:.08em;color:var(--paper)}
.brand-sub{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.26em;
  color:var(--text-mute);
}

/* 目录按钮 */
.nav-toggle{
  display:none;
  align-items:center;
  gap:10px;
  padding:10px 14px;
  border:1px solid rgba(62,224,255,.42);
  border-radius:var(--radius);
  background:rgba(62,224,255,.08);
  color:var(--cyan);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.22em;
  text-transform:uppercase;
  transition:background .22s ease,border-color .22s ease,color .22s ease;
}
.nav-toggle:hover{background:rgba(62,224,255,.16)}
.nav-toggle-label{white-space:nowrap}
.nav-toggle-bars{
  display:inline-flex;
  flex-direction:column;
  justify-content:center;
  gap:4px;
  width:16px;
  height:12px;
}
.nav-toggle-bars i{
  display:block;
  width:100%;
  height:1.5px;
  background:currentColor;
  transition:transform .25s ease,opacity .2s ease;
}
.site-header[data-open="true"] .nav-toggle{
  background:rgba(255,106,43,.14);
  border-color:rgba(255,106,43,.55);
  color:var(--orange-soft);
}
.site-header[data-open="true"] .nav-toggle-bars i:nth-child(1){transform:translateY(5.5px) rotate(45deg)}
.site-header[data-open="true"] .nav-toggle-bars i:nth-child(2){opacity:0}
.site-header[data-open="true"] .nav-toggle-bars i:nth-child(3){transform:translateY(-5.5px) rotate(-45deg)}

/* 主导航 */
.primary-nav{margin-left:auto}
.nav-list{display:flex;align-items:stretch;gap:2px}
.nav-item{display:flex}
.nav-link{
  position:relative;
  display:inline-flex;
  align-items:baseline;
  gap:7px;
  padding:11px 13px;
  border:1px solid transparent;
  border-radius:var(--radius);
  color:var(--text-dim);
  font-size:15px;
  font-weight:600;
  letter-spacing:.05em;
  text-decoration:none;
  transition:color .22s ease,background .22s ease,border-color .22s ease;
}
.nav-link:hover{
  color:var(--paper);
  background:rgba(62,224,255,.07);
  border-color:var(--line);
}
.nav-index{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.04em;
  color:var(--text-mute);
  transition:color .22s ease;
}
.nav-link:hover .nav-index{color:var(--cyan)}
.nav-link[aria-current="page"]{
  color:var(--cyan);
  background:linear-gradient(180deg,rgba(62,224,255,.14),rgba(62,224,255,.02));
  border-color:rgba(62,224,255,.36);
}
.nav-link[aria-current="page"] .nav-index{color:var(--orange)}
.nav-link[aria-current="page"]::after{
  content:"";
  position:absolute;
  left:12px;
  right:12px;
  bottom:-1px;
  height:2px;
  background:linear-gradient(90deg,var(--orange),var(--gold));
}

/* 平板 / 手机导航 */
@media (max-width:1024px){
  .nav-toggle{display:inline-flex}
  .header-inner{min-height:68px}
  .primary-nav{
    position:absolute;
    left:0;
    right:0;
    top:100%;
    width:100%;
    margin-left:0;
    padding:10px clamp(18px,4vw,46px) 22px;
    background:linear-gradient(180deg,rgba(7,11,32,.99),rgba(5,8,24,.99));
    border-top:1px solid var(--line);
    border-bottom:1px solid var(--line-strong);
    box-shadow:0 44px 74px -44px rgba(0,0,0,1);
    opacity:0;
    visibility:hidden;
    transform:translateY(-10px);
    transition:opacity .24s ease,transform .24s ease,visibility .24s;
    max-height:calc(100vh - 96px);
    overflow-y:auto;
  }
  .site-header[data-open="true"] .primary-nav{
    opacity:1;
    visibility:visible;
    transform:none;
  }
  .nav-list{flex-direction:column;gap:0}
  .nav-item{width:100%}
  .nav-link{
    width:100%;
    justify-content:flex-start;
    padding:15px 4px;
    border:0;
    border-bottom:1px solid var(--line);
    border-radius:0;
    background:none;
    font-size:16.5px;
  }
  .nav-link:hover{background:rgba(62,224,255,.06)}
  .nav-link[aria-current="page"]{
    background:linear-gradient(90deg,rgba(62,224,255,.14),transparent);
  }
  .nav-link[aria-current="page"]::after{
    left:0;
    right:auto;
    top:0;
    bottom:0;
    width:2px;
    height:auto;
    background:var(--orange);
  }
  .nav-index{font-size:11px}
}
@media (max-width:640px){
  .rail-item:first-child{display:none}
  .header-rail-inner{min-height:30px}
  .brand-name{font-size:17px}
  .brand-sub{display:none}
  .brand-mark{width:38px;height:38px;font-size:13px}
}

/* ============================================================
   页脚：数据港基座
   ============================================================ */
.site-footer{
  position:relative;
  margin-top:clamp(60px,9vw,120px);
  border-top:1px solid var(--line-strong);
  background:linear-gradient(180deg,rgba(10,16,44,.65),rgba(4,6,16,.98) 55%,#03040c);
}
.site-footer::before{
  content:"";
  position:absolute;
  top:-1px;
  left:0;
  right:0;
  height:2px;
  opacity:.88;
  background:linear-gradient(90deg,var(--gold),var(--orange) 35%,var(--cyan) 72%,transparent);
}
.footer-frame{padding:clamp(46px,6vw,80px) 0 clamp(30px,4vw,48px)}
.footer-grid{
  display:grid;
  grid-template-columns:1.6fr 1fr 1fr 1.4fr;
  gap:clamp(26px,4vw,58px);
}
.footer-brand{
  display:flex;
  flex-direction:column;
  align-items:flex-start;
  gap:16px;
}
.brand--footer{margin-bottom:2px}
.footer-lede{
  max-width:32ch;
  color:var(--text-dim);
  font-size:15px;
  line-height:1.85;
}
.footer-mark{
  display:inline-block;
  padding:7px 12px;
  border:1px solid rgba(233,194,88,.45);
  border-radius:2px;
  background:rgba(233,194,88,.06);
  color:var(--gold);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
}
.footer-col{display:flex;flex-direction:column;gap:14px}
.footer-heading{
  padding-bottom:10px;
  border-bottom:1px solid var(--line);
  color:var(--cyan);
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:600;
  letter-spacing:.26em;
  text-transform:uppercase;
}
.footer-list{display:grid;gap:11px}
.footer-link{
  display:inline-flex;
  align-items:center;
  gap:8px;
  color:var(--text-dim);
  font-size:15px;
  text-decoration:none;
  transition:color .2s ease;
}
.footer-link::before{
  content:"";
  width:6px;
  height:1px;
  background:var(--orange);
  opacity:.55;
  transition:width .22s ease,opacity .22s ease;
}
.footer-link:hover{color:var(--cyan)}
.footer-link:hover::before{width:14px;opacity:1}

/* 联系方式 */
.contact-list{display:grid;gap:13px}
.contact-item{display:grid;gap:3px}
.contact-label{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.24em;
  text-transform:uppercase;
  color:var(--text-mute);
}
.contact-value{
  color:var(--paper);
  font-size:14.5px;
  line-height:1.6;
  word-break:break-word;
}
.contact-note{
  margin-top:4px;
  padding-left:12px;
  border-left:2px solid rgba(62,224,255,.5);
  color:var(--text-dim);
  font-size:13px;
  line-height:1.8;
}

/* 页脚底栏 */
.footer-meta{
  border-top:1px solid var(--line);
  background:rgba(3,5,14,.72);
}
.footer-meta-inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  flex-wrap:wrap;
  gap:14px;
  padding-block:18px;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.12em;
  color:var(--text-mute);
}
.footer-icp{color:rgba(233,194,88,.82)}
.to-top{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:9px 15px;
  border:1px solid var(--line-strong);
  border-radius:999px;
  background:rgba(62,224,255,.05);
  color:var(--text-dim);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  transition:color .22s ease,border-color .22s ease,background .22s ease,transform .22s ease;
}
.to-top:hover{
  color:var(--cyan);
  border-color:rgba(62,224,255,.6);
  background:rgba(62,224,255,.12);
  transform:translateY(-2px);
}
.to-top-arrow{font-size:13px;line-height:1}

@media (max-width:1024px){
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-brand{grid-column:1 / -1}
}
@media (max-width:640px){
  .footer-grid{grid-template-columns:minmax(0,1fr)}
  .footer-meta-inner{flex-direction:column;align-items:flex-start}
}

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

/* 面板（堆叠画板） */
.panel{
  position:relative;
  padding:clamp(24px,3.4vw,44px);
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:linear-gradient(180deg,rgba(13,21,58,.90),rgba(7,11,32,.78));
  box-shadow:var(--shadow-deep);
  overflow:hidden;
}
.panel::after{
  content:"";
  position:absolute;
  inset:7px;
  border:1px dashed rgba(118,158,224,.16);
  border-radius:2px;
  pointer-events:none;
}
.panel--paper{
  background:linear-gradient(180deg,#f5efe3,#e4d9c4);
  border-color:rgba(0,0,0,.16);
  color:#191533;
}
.panel--paper::after{border-color:rgba(0,0,0,.14)}
.panel--outline{background:transparent;box-shadow:none}
.panel--flush{padding:0}

/* 章节标记 */
.section-num{
  display:block;
  font-family:var(--font-mono);
  font-size:clamp(34px,6vw,74px);
  font-weight:700;
  line-height:.86;
  letter-spacing:-.02em;
  color:transparent;
  -webkit-text-stroke:1.2px rgba(62,224,255,.6);
}
@supports not (-webkit-text-stroke:1px red){
  .section-num{color:rgba(62,224,255,.42)}
}
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  color:var(--cyan);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.3em;
  text-transform:uppercase;
}
.eyebrow::before{
  content:"";
  width:26px;
  height:1px;
  background:var(--orange);
  opacity:.9;
}

/* 标签 */
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:5px 11px;
  border:1px solid var(--line-strong);
  border-radius:999px;
  background:rgba(62,224,255,.06);
  color:var(--text-dim);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
}
.tag--gold{
  border-color:rgba(233,194,88,.5);
  background:rgba(233,194,88,.08);
  color:var(--gold);
}
.tag--accent{
  border-color:rgba(255,106,43,.5);
  background:rgba(255,106,43,.08);
  color:var(--orange-soft);
}

/* 按钮 */
.btn{
  display:inline-flex;
  align-items:center;
  gap:10px;
  padding:13px 22px;
  border:1px solid var(--line-strong);
  border-radius:var(--radius);
  background:rgba(62,224,255,.05);
  color:var(--text);
  font-size:15px;
  font-weight:700;
  letter-spacing:.14em;
  text-decoration:none;
  transition:transform .22s ease,background .22s ease,color .22s ease,border-color .22s ease,box-shadow .22s ease;
}
.btn:hover{transform:translateY(-2px)}
.btn--primary{
  border-color:transparent;
  background:linear-gradient(120deg,var(--cyan),#21a7d6);
  color:#03121e;
  box-shadow:0 16px 34px -18px rgba(62,224,255,.95);
}
.btn--primary:hover{box-shadow:0 20px 40px -18px rgba(62,224,255,1)}
.btn--accent{
  border-color:transparent;
  background:linear-gradient(120deg,var(--orange),#ff9346);
  color:#210a02;
  box-shadow:0 16px 34px -18px rgba(255,106,43,.95);
}
.btn--gold{
  border-color:rgba(233,194,88,.55);
  background:rgba(233,194,88,.07);
  color:var(--gold);
}
.btn--gold:hover{background:rgba(233,194,88,.16)}
.btn--ghost:hover{
  background:rgba(62,224,255,.12);
  border-color:rgba(62,224,255,.5);
  color:var(--paper);
}
.btn--block{width:100%;justify-content:center}

/* 面包屑 */
.breadcrumb{padding-block:18px}
.breadcrumb-list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:10px;
  color:var(--text-mute);
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.14em;
}
.breadcrumb-item{display:inline-flex;align-items:center;gap:10px}
.breadcrumb-item:not(:last-child)::after{content:"/";color:rgba(118,158,224,.5)}
.breadcrumb-link{color:var(--text-dim);text-decoration:none}
.breadcrumb-link:hover{color:var(--cyan)}
.breadcrumb-current{color:var(--paper)}

/* 正文 */
.prose{
  max-width:72ch;
  color:var(--text-dim);
  font-size:16.5px;
  line-height:1.95;
}
.prose > * + *{margin-top:1.1em}
.prose h2{
  margin-top:2em;
  color:var(--paper);
  font-size:clamp(1.45rem,2.6vw,2rem);
  font-weight:800;
}
.prose h3{margin-top:1.6em;color:var(--paper);font-size:1.18rem;font-weight:700}
.prose strong{color:var(--paper)}
.prose ul,.prose ol{display:grid;gap:8px;padding-left:1.3em}
.prose ul{list-style:none}
.prose ul > li{position:relative;padding-left:1.1em}
.prose ul > li::before{
  content:"";
  position:absolute;
  left:0;
  top:.72em;
  width:6px;
  height:1px;
  background:var(--cyan);
}
.prose ol{list-style:decimal}
.prose a{
  color:var(--cyan);
  text-decoration:none;
  border-bottom:1px solid rgba(62,224,255,.45);
}
.prose a:hover{color:var(--orange-soft);border-color:currentColor}
.prose blockquote{
  padding:14px 20px;
  border-left:2px solid var(--orange);
  background:rgba(255,106,43,.07);
  color:var(--text);
}
.prose code{
  padding:2px 6px;
  border:1px solid var(--line);
  border-radius:2px;
  background:rgba(62,224,255,.07);
  color:var(--cyan);
  font-family:var(--font-mono);
  font-size:.92em;
}

/* 图片容器（页面阶段放 img） */
.media-frame{
  position:relative;
  isolation:isolate;
  overflow:hidden;
  border:1px solid var(--line-strong);
  border-radius:var(--radius);
  background:radial-gradient(120% 130% at 18% 0%, #132450, #060a1c 72%);
  aspect-ratio:16 / 10;
}
.media-frame img{
  width:100%;
  height:100%;
  object-fit:cover;
  transition:transform .6s cubic-bezier(.2,.7,.3,1);
}
.media-frame::after{
  content:"";
  position:absolute;
  inset:0;
  z-index:1;
  pointer-events:none;
  background:linear-gradient(180deg,rgba(5,8,26,0) 45%,rgba(5,8,26,.7));
}
.media-frame--plain::after{display:none}
.media-frame--wide{aspect-ratio:21 / 9}
.media-frame--tall{aspect-ratio:4 / 5}
.media-frame--square{aspect-ratio:1 / 1}
.media-frame--paper{
  padding:10px;
  border-color:rgba(0,0,0,.22);
  background:#efe6d5;
}
.media-frame--paper img{border:1px solid rgba(0,0,0,.14)}
.media-frame--tilt{transform:perspective(1000px) rotateY(-5deg) rotateX(1.5deg)}
.media-frame--glow{
  box-shadow:0 40px 80px -50px rgba(62,224,255,.9),0 0 0 1px rgba(62,224,255,.18);
}
.media-frame:hover img{transform:scale(1.03)}
.figure{display:grid;gap:12px;margin:0}
.caption{
  color:var(--text-mute);
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.12em;
}

/* 行内跳转 */
.link-arrow{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding-bottom:2px;
  border-bottom:1px solid rgba(62,224,255,.35);
  color:var(--cyan);
  font-weight:600;
  letter-spacing:.06em;
  text-decoration:none;
}
.link-arrow::after{content:"→";transition:transform .22s ease}
.link-arrow:hover{color:var(--orange-soft);border-color:currentColor}
.link-arrow:hover::after{transform:translateX(4px)}

/* 显现 */
[data-reveal]{
  opacity:0;
  transform:translateY(18px);
  transition:opacity .6s ease,transform .6s cubic-bezier(.2,.7,.3,1);
}
[data-reveal].is-visible{opacity:1;transform:none}

/* 目录高亮 */
.is-active[data-toc-link]{color:var(--cyan)}

/* ---------- 主题色补充 ---------- */
::placeholder{color:var(--text-mute)}

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