:root{
  --abyss:#061A2E;
  --midnight:#0B2745;
  --cyan:#2BE0C8;
  --cyan-deep:#127F78;
  --lava:#FF6A2A;
  --lava-deep:#B84318;
  --mist:#F3F8FB;
  --mist-cyan:#D8F5F0;
  --steel:#9FB2C4;
  --ink:#020A12;
  --violet:#6E7BFF;

  --font-sans:"PingFang SC","Hiragino Sans GB","Source Han Sans SC","Noto Sans CJK SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:ui-monospace,"SF Mono","JetBrains Mono",Menlo,Consolas,"Roboto Mono","Courier New",monospace;

  --bar-h:66px;
  --wrap:1240px;
  --gutter:clamp(1.1rem,3.4vw,3rem);
  --line:rgba(43,224,200,.22);
  --line-soft:rgba(159,178,196,.18);
  --ease:cubic-bezier(.22,.61,.36,1);
  --radius:3px;
}

*,*::before,*::after{box-sizing:border-box}
html{
  -webkit-text-size-adjust:100%;
  text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:calc(var(--bar-h) + 1.25rem);
}
body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,blockquote,dl,dd{margin:0}
ul[class],ol[class]{list-style:none;padding:0}
img,svg,video{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0}
a{color:inherit;text-decoration:none}
html,body{height:100%}

body{
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.75;
  color:rgba(243,248,251,.9);
  background-color:var(--abyss);
  background-image:
    radial-gradient(1100px 560px at 88% -12%,rgba(110,123,255,.16),transparent 62%),
    radial-gradient(820px 480px at 6% -6%,rgba(43,224,200,.10),transparent 66%);
  background-repeat:no-repeat;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

h1,h2,h3,h4{
  line-height:1.2;
  font-weight:800;
  letter-spacing:.01em;
  color:var(--mist);
  text-wrap:balance;
}
h1{font-size:clamp(2rem,5.4vw,3.9rem)}
h2{font-size:clamp(1.5rem,3.4vw,2.4rem)}
h3{font-size:clamp(1.15rem,2vw,1.45rem)}
h4{font-size:1.05rem}
strong{font-weight:700;color:var(--mist)}
code,kbd,samp{font-family:var(--font-mono);font-size:.92em}
::selection{background:var(--cyan);color:var(--ink)}

:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:2px}
#main-content:focus{outline:none}

/* ---------- 布局容器 ---------- */
.container{
  width:100%;
  max-width:var(--wrap);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.container--narrow{max-width:860px}

.section{
  position:relative;
  padding-block:clamp(2.8rem,6.4vw,5.6rem);
}
.section--tight{padding-block:clamp(1.8rem,3.6vw,3rem)}
.section--midnight{
  background:linear-gradient(180deg,var(--abyss) 0%,var(--midnight) 55%,var(--abyss) 100%);
  border-block:1px solid var(--line-soft);
}
.section--light{
  background:var(--mist);
  color:#0a2740;
  border-block:1px solid rgba(6,26,46,.1);
}
.section--light h1,.section--light h2,.section--light h3,.section--light h4{color:#061A2E}
.section--light strong{color:#061A2E}
.section--light .eyebrow{color:#0e6d66}
.section--light .eyebrow::before{background:#127F78}
.section--light .section-head__title{color:#061A2E}
.section--light .section-head__index{color:#0e6d66;border-color:rgba(18,127,120,.45)}
.section--light .prose{color:#2b4a63}
.section--light .prose a{color:#0e6d66;border-bottom-color:rgba(18,127,120,.5)}
.section--light .tag{border-color:rgba(18,127,120,.45);color:#0e6d66;background:rgba(18,127,120,.08)}
.section--light .tag--lava{border-color:rgba(184,67,24,.45);color:var(--lava-deep);background:rgba(255,106,42,.12)}
.section--light .tag--solid{background:#127F78;color:var(--mist);border-color:#127F78}
.section--light .card{
  background:#fff;
  border-color:rgba(6,26,46,.14);
  color:#123a56;
  box-shadow:0 14px 28px -22px rgba(6,26,46,.5);
}
.section--light .card__title{color:#061A2E}
.section--light .card__meta{color:#5a7488}

.grid-12{
  display:grid;
  grid-template-columns:repeat(12,minmax(0,1fr));
  gap:clamp(1rem,2vw,1.6rem);
}
.grid-12 > *{grid-column:1/-1}

.layout-6-4{
  display:grid;
  grid-template-columns:1fr;
  gap:clamp(1.6rem,3.4vw,3rem);
}
@media (min-width:960px){
  .layout-6-4{grid-template-columns:6fr 4fr;align-items:start}
}
@media (min-width:900px){
  .grid-12 > .col-4{grid-column:span 4}
  .grid-12 > .col-5{grid-column:span 5}
  .grid-12 > .col-6{grid-column:span 6}
  .grid-12 > .col-7{grid-column:span 7}
  .grid-12 > .col-8{grid-column:span 8}
  .grid-12 > .col-12{grid-column:1/-1}
}

/* ---------- 文字组件 ---------- */
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:.55rem;
  font-family:var(--font-mono);
  font-size:.7rem;
  letter-spacing:.24em;
  text-transform:uppercase;
  color:var(--cyan);
  margin-bottom:.9rem;
}
.eyebrow::before{
  content:"";
  width:22px;
  height:2px;
  background:var(--cyan);
  flex:0 0 auto;
}

.prose{
  max-width:72ch;
  font-size:clamp(1rem,.35vw + .96rem,1.08rem);
  line-height:1.95;
  letter-spacing:.01em;
  color:rgba(243,248,251,.86);
  word-break:normal;
  overflow-wrap:anywhere;
  line-break:strict;
}
.prose p{margin-bottom:1.15em}
.prose p:last-child{margin-bottom:0}
.prose h2,.prose h3{margin-block:1.8em .7em}
.prose ul,.prose ol{margin:0 0 1.15em;padding-left:1.3em}
.prose ul{list-style:disc}
.prose ol{list-style:decimal}
.prose li{margin-bottom:.45em}
.prose a{color:var(--cyan);border-bottom:1px solid rgba(43,224,200,.45);padding-bottom:1px}
.prose a:hover{color:var(--mist);border-bottom-color:var(--mist)}
.prose blockquote{
  margin:1.6em 0;
  padding:.9rem 0 .9rem 1.2rem;
  border-left:3px solid var(--lava);
  color:var(--mist);
  font-size:1.02em;
}
.prose strong{color:var(--mist)}

/* ---------- 章节标记 ---------- */
.section-head{
  display:flex;
  align-items:center;
  flex-wrap:wrap;
  gap:.85rem;
  margin-bottom:clamp(1.3rem,3vw,2.2rem);
}
.section-head__index{
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.2em;
  color:var(--cyan);
  border:1px solid rgba(43,224,200,.4);
  padding:.18rem .45rem;
  line-height:1.4;
  flex:0 0 auto;
}
.section-head__title{
  font-size:clamp(1.45rem,3.2vw,2.35rem);
  font-style:italic;
  font-weight:800;
  letter-spacing:.005em;
  margin:0;
  color:var(--mist);
}
.section-head__rule{
  flex:1 1 60px;
  min-width:40px;
  height:1px;
  background:linear-gradient(90deg,var(--cyan),rgba(43,224,200,0));
  transform:scaleX(.24);
  transform-origin:left center;
  transition:transform .75s var(--ease),opacity .5s var(--ease);
  opacity:.5;
}
[data-section][data-in-view] .section-head__rule{transform:scaleX(1);opacity:1}

/* ---------- 标签 ---------- */
.tag{
  display:inline-flex;
  align-items:center;
  gap:.35rem;
  font-family:var(--font-mono);
  font-size:.68rem;
  line-height:1.4;
  letter-spacing:.12em;
  padding:.24rem .55rem;
  border:1px solid rgba(43,224,200,.42);
  border-radius:2px;
  color:var(--cyan);
  background:rgba(43,224,200,.08);
  white-space:nowrap;
}
.tag--lava{
  border-color:rgba(255,106,42,.5);
  color:var(--lava);
  background:rgba(255,106,42,.12);
}
.tag--solid{
  background:var(--cyan);
  color:#04121f;
  border-color:var(--cyan);
  font-weight:700;
}

/* ---------- 卡片 ---------- */
.card{
  position:relative;
  padding:1.35rem 1.4rem;
  border:1px solid var(--line-soft);
  border-radius:var(--radius);
  background:linear-gradient(160deg,rgba(11,39,69,.94),rgba(6,26,46,.94));
  transition:border-color .25s var(--ease),transform .25s var(--ease),box-shadow .25s var(--ease);
}
.card:hover{
  border-color:rgba(43,224,200,.55);
  transform:translateY(-3px);
  box-shadow:0 22px 40px -30px rgba(43,224,200,.75);
}
.card__title{
  font-size:1.12rem;
  font-weight:700;
  margin-bottom:.5rem;
  color:var(--mist);
}
.card__text{
  font-size:.94rem;
  line-height:1.85;
  color:rgba(243,248,251,.74);
}
.card__meta{
  display:flex;
  flex-wrap:wrap;
  gap:.6rem 1rem;
  margin-top:.9rem;
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.1em;
  color:var(--steel);
}

/* ---------- 图片容器基础规则 ---------- */
.media-frame{
  position:relative;
  isolation:isolate;
  overflow:hidden;
  border:1px solid var(--line-soft);
  border-radius:var(--radius);
  background:linear-gradient(142deg,var(--midnight) 0%,#0f3357 52%,#123f5e 100%);
  aspect-ratio:16/10;
}
.media-frame > img{
  width:100%;
  height:100%;
  object-fit:cover;
  transition:transform .6s var(--ease),filter .6s var(--ease);
}
.media-frame:hover > img{transform:scale(1.03)}
.media-frame::after{
  content:"";
  position:absolute;
  inset:0;
  z-index:1;
  pointer-events:none;
  background:
    linear-gradient(212deg,rgba(43,224,200,.18),transparent 46%,rgba(255,106,42,.16)),
    linear-gradient(180deg,rgba(2,10,18,0) 55%,rgba(2,10,18,.55));
}
.media-frame__label{
  position:absolute;
  left:0;
  bottom:0;
  z-index:2;
  font-family:var(--font-mono);
  font-size:.68rem;
  letter-spacing:.16em;
  padding:.32rem .6rem;
  background:var(--lava);
  color:#1a0800;
  font-weight:700;
}
.media-frame--hero{aspect-ratio:16/10}
.media-frame--tall{aspect-ratio:4/5}
.media-frame--band{aspect-ratio:21/9}
.media-frame--diagonal{clip-path:polygon(0 0,100% 0,100% 88%,0 100%)}
@media (max-width:600px){
  .media-frame--band{aspect-ratio:16/9}
  .media-frame--tall{aspect-ratio:3/4}
}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.45rem;
  padding:.62rem 1.1rem;
  font-family:var(--font-sans);
  font-size:.86rem;
  font-weight:700;
  letter-spacing:.05em;
  line-height:1.4;
  color:var(--ink);
  background:var(--cyan);
  border:1px solid var(--cyan);
  border-radius:2px;
  cursor:pointer;
  transition:background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease),transform .2s var(--ease);
}
.btn:hover{background:#4ff0da;border-color:#4ff0da;transform:translateY(-1px)}
.btn:active{transform:translateY(0)}
.btn--ghost{
  background:transparent;
  color:var(--mist);
  border-color:rgba(43,224,200,.45);
}
.btn--ghost:hover{background:rgba(43,224,200,.14);color:var(--cyan);border-color:var(--cyan)}
.btn--lava{
  background:var(--lava);
  border-color:var(--lava);
  color:#1a0800;
}
.btn--lava:hover{background:#ff8347;border-color:#ff8347}
.btn--sm{padding:.42rem .8rem;font-size:.78rem}
.btn--block{width:100%}

/* ---------- 面包屑 ---------- */
.breadcrumbs{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:.45rem;
  margin-bottom:1.1rem;
  font-family:var(--font-mono);
  font-size:.7rem;
  letter-spacing:.1em;
  color:var(--steel);
}
.breadcrumbs__item{
  display:inline-flex;
  align-items:center;
  gap:.45rem;
}
.breadcrumbs__item + .breadcrumbs__item::before{
  content:"/";
  color:rgba(159,178,196,.45);
}
.breadcrumbs__item a{color:var(--steel);transition:color .2s var(--ease)}
.breadcrumbs__item a:hover{color:var(--cyan)}
.breadcrumbs__item [aria-current="page"]{color:var(--cyan)}

/* ---------- 显现 ---------- */
.js [data-reveal]{
  opacity:0;
  transform:translateY(16px);
  transition:opacity .65s var(--ease),transform .65s var(--ease);
}
.js [data-reveal][data-revealed]{
  opacity:1;
  transform:none;
}

/* ================= 头部 ================= */
.site-header{
  position:sticky;
  top:0;
  z-index:80;
  color:var(--mist);
  background:linear-gradient(180deg,rgba(6,26,46,.97),rgba(11,39,69,.94));
  border-bottom:1px solid var(--line);
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
}

.skip-link{
  position:absolute;
  left:.9rem;
  top:-4rem;
  z-index:140;
  padding:.62rem 1.05rem;
  font-size:.85rem;
  font-weight:700;
  letter-spacing:.04em;
  color:#1a0800;
  background:var(--lava);
  border-radius:2px;
  transition:top .2s var(--ease);
}
.skip-link:focus,
.skip-link:focus-visible{top:.65rem;outline-color:var(--mist)}

.header-progress{
  position:absolute;
  left:0;
  right:0;
  bottom:-1px;
  height:2px;
  overflow:hidden;
  background:rgba(159,178,196,.14);
  pointer-events:none;
}
.header-progress__bar{
  display:block;
  width:100%;
  height:100%;
  transform:scaleX(var(--progress,0));
  transform-origin:left center;
  background:linear-gradient(90deg,var(--cyan) 0%,var(--violet) 58%,var(--lava) 100%);
  transition:transform .12s linear;
}

.command-bar{
  max-width:var(--wrap);
  margin-inline:auto;
  padding-inline:var(--gutter);
  min-height:var(--bar-h);
  display:flex;
  align-items:center;
  gap:clamp(.6rem,1.8vw,1.9rem);
}

.brand{
  display:flex;
  align-items:baseline;
  gap:.4rem;
  flex:0 0 auto;
  padding:.2rem 0 .2rem .7rem;
  border-left:3px solid var(--cyan);
  color:var(--mist);
  transition:border-color .2s var(--ease);
}
.brand:hover{border-left-color:var(--lava)}
.brand__mark{
  font-size:1.1rem;
  font-weight:800;
  letter-spacing:.07em;
  line-height:1.2;
}
.brand__word{
  font-size:1rem;
  font-weight:500;
  letter-spacing:.16em;
  color:var(--cyan);
}
.brand__meta{
  display:none;
  font-family:var(--font-mono);
  font-size:.58rem;
  letter-spacing:.18em;
  color:var(--steel);
  align-self:center;
  margin-left:.3rem;
}
@media (min-width:1060px){
  .brand__meta{display:inline}
}

.nav{
  display:flex;
  align-items:center;
  gap:clamp(.4rem,1.4vw,1.3rem);
  margin-left:auto;
  min-width:0;
}
.nav__list{
  display:flex;
  align-items:center;
  gap:clamp(.05rem,.7vw,.5rem);
  margin:0;
  padding:0;
  list-style:none;
}
.nav__item{display:flex}
.nav__link{
  position:relative;
  display:inline-flex;
  align-items:baseline;
  gap:.4rem;
  padding:.55rem .55rem;
  font-size:.86rem;
  letter-spacing:.03em;
  line-height:1.3;
  color:rgba(243,248,251,.8);
  border-radius:2px;
  white-space:nowrap;
  transition:color .2s var(--ease),background .2s var(--ease);
}
.nav__link::after{
  content:"";
  position:absolute;
  left:.55rem;
  right:.55rem;
  bottom:.24rem;
  height:2px;
  background:var(--cyan);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .25s var(--ease);
}
.nav__link:hover{color:var(--mist);background:rgba(43,224,200,.08)}
.nav__link:hover::after{transform:scaleX(1)}
.nav__index{
  font-family:var(--font-mono);
  font-size:.6rem;
  letter-spacing:.08em;
  color:var(--cyan-deep);
  transition:color .2s var(--ease);
}
.nav__label{display:inline-block}

.nav__item--primary .nav__link{
  color:var(--mist);
  font-weight:700;
  padding-left:.9rem;
}
.nav__item--primary .nav__link::before{
  content:"";
  position:absolute;
  left:.25rem;
  top:50%;
  width:5px;
  height:5px;
  margin-top:-2.5px;
  border-radius:50%;
  background:var(--lava);
  box-shadow:0 0 0 3px rgba(255,106,42,.18);
}
.nav__item--primary .nav__index{color:var(--lava)}

.nav__link[aria-current="page"]{
  color:var(--mist);
  background:rgba(43,224,200,.12);
  box-shadow:inset 0 -2px 0 0 var(--cyan);
}
.nav__link[aria-current="page"] .nav__index{color:var(--cyan)}
.nav__item--primary .nav__link[aria-current="page"]{
  background:rgba(255,106,42,.14);
  box-shadow:inset 0 -2px 0 0 var(--lava);
}

.nav__utility{
  display:flex;
  align-items:center;
  gap:.55rem;
  padding-left:clamp(.4rem,1.2vw,1rem);
  margin-left:.2rem;
  border-left:1px solid var(--line-soft);
}
.nav__util{
  font-size:.8rem;
  letter-spacing:.08em;
  color:var(--steel);
  padding:.45rem .2rem;
  transition:color .2s var(--ease);
}
.nav__util:hover{color:var(--cyan)}

.nav-toggle{
  display:none;
  align-items:center;
  gap:.55rem;
  margin-left:auto;
  padding:.48rem .72rem;
  font-size:.8rem;
  letter-spacing:.1em;
  color:var(--mist);
  background:rgba(43,224,200,.08);
  border:1px solid rgba(43,224,200,.4);
  border-radius:2px;
  cursor:pointer;
  transition:background .2s var(--ease),border-color .2s var(--ease);
}
.nav-toggle:hover{background:rgba(43,224,200,.16);border-color:var(--cyan)}
.nav-toggle__bars{
  display:grid;
  gap:4px;
  width:16px;
}
.nav-toggle__bars > span{
  display:block;
  height:2px;
  width:100%;
  background:var(--cyan);
  transition:transform .24s var(--ease),opacity .24s var(--ease);
}
.nav-toggle__text{line-height:1}
.site-header[data-open] .nav-toggle__bars > span:nth-child(1){transform:translateY(3px) rotate(45deg)}
.site-header[data-open] .nav-toggle__bars > span:nth-child(2){transform:translateY(-3px) rotate(-45deg)}
.site-header[data-open] .nav-toggle{background:rgba(255,106,42,.18);border-color:rgba(255,106,42,.6)}

@media (max-width:899px){
  .nav{
    position:absolute;
    left:0;
    right:0;
    top:100%;
    display:none;
    flex-direction:column;
    align-items:stretch;
    gap:0;
    margin-left:0;
    padding:.5rem var(--gutter) 1.15rem;
    background:linear-gradient(180deg,rgba(8,32,56,.99),rgba(6,26,46,.99));
    border-bottom:1px solid var(--line);
    box-shadow:0 26px 44px -22px rgba(2,10,18,.85);
    max-height:calc(100vh - var(--bar-h));
    overflow-y:auto;
    overscroll-behavior:contain;
  }
  .nav[data-open]{display:flex;animation:commandIn .22s var(--ease)}
  .nav__list{flex-direction:column;align-items:stretch;gap:0}
  .nav__item{border-bottom:1px solid rgba(159,178,196,.14)}
  .nav__link{width:100%;padding:.85rem .2rem;font-size:1rem;gap:.7rem}
  .nav__link::after{display:none}
  .nav__index{font-size:.7rem;min-width:1.9rem}
  .nav__item--primary .nav__link{padding-left:1.2rem}
  .nav__item--primary .nav__link::before{left:.35rem}
  .nav__utility{
    flex-direction:column;
    align-items:stretch;
    gap:.55rem;
    margin-left:0;
    padding-left:0;
    padding-top:1rem;
    border-left:0;
    border-top:1px dashed rgba(159,178,196,.24);
    margin-top:.7rem;
  }
  .nav__util{padding:.55rem .2rem;font-size:.95rem}
  .nav__utility .btn{width:100%}
  .nav-toggle{display:inline-flex}
}
@keyframes commandIn{
  from{opacity:0;transform:translateY(-8px)}
  to{opacity:1;transform:none}
}

/* ================= 页脚 ================= */
.site-footer{
  position:relative;
  overflow:hidden;
  color:var(--steel);
  background:linear-gradient(180deg,#04121f 0%,var(--ink) 72%);
  border-top:1px solid rgba(43,224,200,.25);
}
.site-footer::before{
  content:"";
  position:absolute;
  inset:0 0 auto 0;
  height:2px;
  background:linear-gradient(90deg,var(--cyan),var(--violet) 55%,var(--lava));
  opacity:.85;
}
.footer__inner{
  max-width:var(--wrap);
  margin-inline:auto;
  padding:clamp(2.4rem,5vw,4rem) var(--gutter) 1.6rem;
  position:relative;
}
.footer__grid{
  display:grid;
  grid-template-columns:1fr;
  gap:2rem;
}
@media (min-width:760px){
  .footer__grid{grid-template-columns:1.6fr 1fr 1fr 1fr;gap:clamp(1.4rem,3vw,3rem)}
}
.footer__brand{min-width:0}
.footer__logo{
  font-size:1.4rem;
  font-weight:800;
  font-style:italic;
  letter-spacing:.12em;
  color:var(--mist);
  margin-bottom:.7rem;
}
.footer__tagline{
  max-width:26rem;
  font-size:.9rem;
  line-height:1.85;
  color:var(--steel);
  margin-bottom:1.1rem;
}
.footer__seal{
  display:inline-flex;
  align-items:center;
  gap:.4rem;
  padding:.32rem .6rem;
  font-family:var(--font-mono);
  font-size:.64rem;
  letter-spacing:.16em;
  color:var(--cyan);
  border:1px solid rgba(43,224,200,.38);
  border-radius:2px;
  background:rgba(43,224,200,.06);
}
.footer__col{min-width:0}
.footer__col-title{
  margin:0 0 .95rem;
  padding-bottom:.5rem;
  font-family:var(--font-mono);
  font-size:.7rem;
  font-weight:700;
  letter-spacing:.2em;
  color:var(--mist);
  border-bottom:1px solid rgba(159,178,196,.2);
}
.footer__list{
  list-style:none;
  margin:0;
  padding:0;
  display:grid;
  gap:.55rem;
}
.footer__link{
  display:inline-block;
  font-size:.88rem;
  line-height:1.6;
  color:var(--steel);
  padding:.1rem 0;
  transition:color .2s var(--ease),transform .2s var(--ease);
}
.footer__link:hover{color:var(--cyan);transform:translateX(3px)}

.footer__contact{
  list-style:none;
  margin:clamp(1.8rem,3.5vw,2.6rem) 0 0;
  padding:1.2rem 0 0;
  display:grid;
  grid-template-columns:1fr;
  gap:.55rem 1.6rem;
  border-top:1px solid rgba(159,178,196,.16);
}
@media (min-width:700px){
  .footer__contact{grid-template-columns:repeat(2,minmax(0,1fr))}
}
.footer__contact-item{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  gap:.5rem;
  font-size:.84rem;
  line-height:1.7;
}
.footer__contact-key{
  flex:0 0 auto;
  font-family:var(--font-mono);
  font-size:.65rem;
  letter-spacing:.16em;
  color:var(--cyan-deep);
  border:1px solid rgba(43,224,200,.24);
  padding:.1rem .4rem;
  border-radius:2px;
}
.footer__contact-value{
  color:rgba(243,248,251,.82);
  overflow-wrap:anywhere;
  font-family:var(--font-mono);
  font-size:.82rem;
  letter-spacing:.02em;
}
.footer__legal{
  margin-top:clamp(1.4rem,3vw,2.2rem);
  padding-top:1.1rem;
  border-top:1px solid rgba(159,178,196,.16);
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:.7rem 1.4rem;
  font-size:.76rem;
  letter-spacing:.04em;
  color:var(--steel);
}
.footer__icp{margin:0}
.footer__copy{margin:0;margin-right:auto}
.footer__totop{
  padding:.42rem .8rem;
  font-size:.74rem;
  letter-spacing:.12em;
  color:var(--steel);
  border:1px solid rgba(159,178,196,.32);
  border-radius:2px;
  cursor:pointer;
  transition:color .2s var(--ease),border-color .2s var(--ease),background .2s var(--ease);
}
.footer__totop:hover{
  color:var(--cyan);
  border-color:var(--cyan);
  background:rgba(43,224,200,.08);
}

/* ================= 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;
    scroll-behavior:auto !important;
  }
  .js [data-reveal]{opacity:1;transform:none}
  .section-head__rule{transform:scaleX(1);opacity:1}
  .card:hover{transform:none}
  .media-frame:hover > img{transform:none}
  .footer__link:hover{transform:none}
  .header-progress__bar{transition:none}
}