:root{
  --deep:#0B3B5C;
  --coral:#E85A3C;
  --coral-soft:#FFB39F;
  --palm:#2F8F6B;
  --pearl:#FDF8F0;
  --cream:#F4E6D2;
  --ink:#2A1E18;
  --mist:#DCEBF2;
  --slate:#48677D;
  --midnight:#071E2E;
  --amber:#E8A23A;

  --ink-soft:rgba(42,30,24,.72);
  --line:rgba(42,30,24,.14);
  --line-light:rgba(253,248,240,.16);

  --font-display:"Noto Sans SC","HarmonyOS Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"MiSans","Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono","Roboto Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  --r-sm:12px;
  --r-md:20px;
  --r-lg:28px;
  --r-xl:32px;
  --pill:999px;

  --sp-1:4px;
  --sp-2:8px;
  --sp-3:12px;
  --sp-4:20px;
  --sp-5:32px;
  --sp-6:56px;
  --sp-7:88px;

  --container:1200px;
  --ease:cubic-bezier(.2,.8,.2,1);
  --shadow-1:0 1px 0 rgba(255,255,255,.5) inset,0 12px 30px -18px rgba(11,59,92,.35);
  --shadow-2:0 24px 60px -32px rgba(7,30,46,.45);
}

*,*::before,*::after{box-sizing:border-box}

html{
  -webkit-text-size-adjust:100%;
  scroll-padding-top:96px;
}

@media (prefers-reduced-motion:no-preference){
  html{scroll-behavior:smooth}
}

body{
  margin:0;
  background:var(--pearl);
  color:var(--ink);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  font-weight:400;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

@media (min-width:900px){
  body{font-size:17px;line-height:1.8}
}

main{display:block}
i{font-style:normal}

h1,h2,h3,h4,p,figure,blockquote,dl,dd{margin:0}
ul,ol{margin:0;padding:0}
ul[class],ol[class]{list-style:none}

img,svg,video{max-width:100%;height:auto}

button{font:inherit;color:inherit}

a{color:var(--coral);text-decoration-thickness:1px;text-underline-offset:3px}

:where(a,button,[tabindex]):focus-visible{
  outline:3px solid var(--amber);
  outline-offset:3px;
  border-radius:6px;
}

.site-header :where(a,button):focus-visible,
.site-footer :where(a,button):focus-visible{
  outline-color:var(--coral-soft);
}

.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;
}

.mono{font-family:var(--font-mono);letter-spacing:.02em}

/* ---------- 容器与骨架 ---------- */
.container{
  width:100%;
  max-width:var(--container);
  margin-inline:auto;
  padding-inline:24px;
}

.section{padding-block:var(--sp-6)}

.grid{display:grid;gap:var(--sp-4)}
.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))}

@media (max-width:900px){
  .grid--3,.grid--4{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:620px){
  .container{padding-inline:16px}
  .section{padding-block:var(--sp-5)}
  .grid--2,.grid--3,.grid--4{grid-template-columns:1fr}
}

/* ---------- 图片容器基础规则 ---------- */
.media{
  position:relative;
  display:block;
  overflow:hidden;
  border-radius:var(--r-lg);
  background:linear-gradient(145deg,var(--mist) 0%,var(--cream) 100%);
  isolation:isolate;
  margin:0;
}

.media > img,
.media > svg,
.media > video{
  display:block;
  width:100%;
  height:100%;
  object-fit:cover;
}

.media--16x9{aspect-ratio:16/9}
.media--4x3{aspect-ratio:4/3}
.media--1x1{aspect-ratio:1/1}
.media--3x4{aspect-ratio:3/4}
.media--wide{aspect-ratio:21/9}

.media--fill{
  background-image:
    radial-gradient(circle at 18% 18%,rgba(232,90,60,.34),transparent 55%),
    radial-gradient(circle at 82% 74%,rgba(47,143,107,.32),transparent 58%),
    linear-gradient(150deg,var(--deep) 0%,var(--midnight) 100%);
}

.media--tint::after{
  content:"";
  position:absolute;
  inset:0;
  background:linear-gradient(180deg,rgba(7,30,46,0) 42%,rgba(7,30,46,.58) 100%);
  pointer-events:none;
}

.media__label{
  position:absolute;
  left:16px;
  bottom:16px;
  z-index:2;
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:6px 14px;
  border-radius:var(--pill);
  background:rgba(253,248,240,.94);
  color:var(--deep);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.08em;
}

@media (max-width:620px){
  .media{border-radius:var(--r-md)}
}

/* ---------- 文字层级 ---------- */
.display{
  font-family:var(--font-display);
  font-weight:900;
  font-size:clamp(2.4rem,7vw,6rem);
  line-height:.98;
  letter-spacing:-.03em;
  color:var(--deep);
  margin:0;
}

.h1{
  font-family:var(--font-display);
  font-weight:900;
  font-size:clamp(2rem,4.6vw,3.6rem);
  line-height:1.05;
  letter-spacing:-.025em;
  color:var(--deep);
  margin:0;
}

.h2{
  font-family:var(--font-display);
  font-weight:800;
  font-size:clamp(1.6rem,3.4vw,2.4rem);
  line-height:1.14;
  letter-spacing:-.02em;
  color:var(--deep);
  margin:0;
}

.h3{
  font-family:var(--font-display);
  font-weight:700;
  font-size:clamp(1.15rem,2.2vw,1.5rem);
  line-height:1.28;
  color:var(--ink);
  margin:0;
}

.lead{
  font-size:clamp(1.02rem,1.6vw,1.18rem);
  line-height:1.7;
  color:var(--ink-soft);
  max-width:60ch;
  margin:0;
}

.prose{max-width:68ch}
.prose p + p{margin-top:1em}
.prose strong{font-weight:600;color:var(--deep)}
.prose a{color:var(--deep);text-decoration:underline;text-decoration-color:var(--coral)}

.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  margin:0;
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:500;
  letter-spacing:.24em;
  text-transform:uppercase;
  color:var(--coral);
}

.eyebrow::before{
  content:"";
  width:22px;
  height:2px;
  border-radius:2px;
  background:currentColor;
}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  min-height:44px;
  padding:12px 22px;
  border:1px solid transparent;
  border-radius:var(--pill);
  background:transparent;
  font-family:var(--font-body);
  font-size:15px;
  font-weight:700;
  letter-spacing:.02em;
  line-height:1.2;
  text-decoration:none;
  cursor:pointer;
  transition:transform .18s var(--ease),background .18s var(--ease),color .18s var(--ease),box-shadow .18s var(--ease),border-color .18s var(--ease);
}

.btn:hover{transform:translateY(-2px)}
.btn:active{transform:translateY(0)}

.btn--coral{
  background:var(--coral);
  color:var(--ink);
  box-shadow:0 10px 24px -14px rgba(232,90,60,.9);
}
.btn--coral:hover{background:#f0664a}

.btn--ink{
  background:var(--deep);
  color:var(--pearl);
}
.btn--ink:hover{background:#0d4970}

.btn--ghost{
  background:transparent;
  color:var(--deep);
  border-color:rgba(11,59,92,.28);
}
.btn--ghost:hover{
  background:rgba(11,59,92,.06);
  border-color:var(--deep);
}

.btn--sm{min-height:38px;padding:8px 16px;font-size:13.5px}
.btn--block{width:100%}

/* ---------- 标签 ---------- */
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:5px 12px;
  border-radius:var(--pill);
  background:var(--mist);
  color:var(--deep);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.06em;
  line-height:1.4;
}
.tag--coral{background:var(--coral-soft);color:var(--ink)}
.tag--palm{background:rgba(47,143,107,.16);color:#1c6146}
.tag--amber{background:rgba(232,162,58,.24);color:#6f4406}

/* ---------- 卡片 ---------- */
.card{
  background:var(--pearl);
  border:1px solid var(--line);
  border-radius:var(--r-md);
  padding:var(--sp-4);
  box-shadow:var(--shadow-1);
  transition:transform .2s var(--ease),box-shadow .2s var(--ease),border-color .2s var(--ease);
}
.card:hover{
  transform:translateY(-2px);
  border-color:rgba(232,90,60,.42);
  box-shadow:var(--shadow-2);
}
.card--cream{background:var(--cream);border-color:rgba(42,30,24,.1)}
.card--deep{background:var(--deep);color:var(--pearl);border-color:transparent}

/* ---------- 面包屑 ---------- */
.breadcrumb{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.04em;
}
.breadcrumb ol{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  list-style:none;
  margin:0;
  padding:0;
  color:var(--slate);
}
.breadcrumb li+li::before{
  content:"/";
  margin-inline-end:8px;
  color:rgba(72,103,125,.5);
}
.breadcrumb a{
  color:var(--deep);
  text-decoration:none;
  border-bottom:1px solid rgba(11,59,92,.25);
}
.breadcrumb a:hover{color:var(--coral);border-color:var(--coral)}
.breadcrumb [aria-current="page"]{color:var(--slate)}

/* ---------- 头部 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:80;
  isolation:isolate;
}

.skip-link{
  position:fixed;
  left:16px;
  top:-88px;
  z-index:200;
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:10px 22px;
  border-radius:var(--pill);
  background:var(--coral);
  color:var(--ink);
  font-weight:700;
  text-decoration:none;
  transition:top .18s var(--ease);
}
.skip-link:focus,
.skip-link:focus-visible{top:16px}

.cmdbar{
  position:relative;
  background:var(--deep);
  color:var(--pearl);
  border-bottom:1px solid var(--line-light);
  box-shadow:0 18px 40px -34px rgba(7,30,46,.9);
}

.cmdbar::after{
  content:"";
  position:absolute;
  inset:0;
  z-index:0;
  pointer-events:none;
  opacity:.55;
  background-image:radial-gradient(rgba(253,248,240,.09) 1px,transparent 1px);
  background-size:6px 6px;
}

.cmdbar__inner{
  position:relative;
  z-index:1;
  display:flex;
  align-items:center;
  gap:var(--sp-4);
  max-width:var(--container);
  margin-inline:auto;
  padding:10px 24px;
  min-height:68px;
}

.brand{
  display:inline-flex;
  align-items:center;
  gap:10px;
  flex:0 0 auto;
  padding:4px 0;
  color:var(--pearl);
  text-decoration:none;
}

.brand__glyph{
  display:flex;
  flex-direction:column;
  gap:3px;
  width:24px;
  flex:0 0 auto;
}

.brand__glyph i{
  display:block;
  height:5px;
  border-radius:var(--pill);
  background:var(--coral);
  transition:width .24s var(--ease),background .24s var(--ease);
}
.brand__glyph i:nth-child(1){width:100%}
.brand__glyph i:nth-child(2){width:68%;background:var(--coral-soft)}
.brand__glyph i:nth-child(3){width:40%;background:var(--palm)}

.brand:hover .brand__glyph i:nth-child(1){width:70%}
.brand:hover .brand__glyph i:nth-child(2){width:100%}
.brand:hover .brand__glyph i:nth-child(3){width:72%}

.brand__text{
  display:flex;
  flex-direction:column;
  line-height:1.05;
  font-family:var(--font-display);
  font-size:18px;
  font-weight:800;
  letter-spacing:.04em;
}

.brand__sub{
  margin-top:3px;
  font-family:var(--font-mono);
  font-size:9.5px;
  font-weight:500;
  letter-spacing:.28em;
  color:rgba(220,235,242,.62);
}

.cmdnav{margin-inline-start:auto}

.cmdnav__list{
  display:flex;
  align-items:center;
  gap:2px;
  list-style:none;
  margin:0;
  padding:0;
}

.cmdnav__link{
  position:relative;
  display:inline-flex;
  align-items:baseline;
  gap:6px;
  padding:9px 12px;
  border-radius:var(--pill);
  color:rgba(253,248,240,.82);
  font-size:15px;
  font-weight:600;
  letter-spacing:.02em;
  line-height:1.3;
  text-decoration:none;
  white-space:nowrap;
  transition:background .18s var(--ease),color .18s var(--ease);
}

.cmdnav__idx{
  font-family:var(--font-mono);
  font-size:10px;
  font-weight:500;
  letter-spacing:.04em;
  color:var(--coral-soft);
  opacity:.75;
}

.cmdnav__link::after{
  content:"";
  position:absolute;
  left:12px;
  right:12px;
  bottom:3px;
  height:2px;
  border-radius:2px;
  background:var(--coral);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .24s var(--ease);
}

.cmdnav__link:hover{color:var(--pearl);background:rgba(220,235,242,.12)}
.cmdnav__link:hover::after{transform:scaleX(1)}

.cmdnav__link[aria-current="page"]{
  color:var(--pearl);
  background:rgba(220,235,242,.16);
}
.cmdnav__link[aria-current="page"]::after{transform:scaleX(1)}
.cmdnav__link[aria-current="page"] .cmdnav__idx{color:var(--amber);opacity:1}

.cmdbar__tools{
  display:flex;
  align-items:center;
  gap:12px;
  flex:0 0 auto;
}

.cmdbar__cta{flex:0 0 auto}

.status{
  display:inline-flex;
  align-items:center;
  gap:8px;
  margin:0;
  padding:6px 12px;
  border:1px solid var(--line-light);
  border-radius:var(--pill);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.04em;
  color:rgba(220,235,242,.8);
  white-space:nowrap;
}

.status__dot{
  width:6px;
  height:6px;
  border-radius:50%;
  background:var(--palm);
  box-shadow:0 0 0 3px rgba(47,143,107,.24);
}

@media (prefers-reduced-motion:no-preference){
  .status__dot{animation:statusPulse 2.8s var(--ease) infinite}
}

@keyframes statusPulse{
  0%,100%{box-shadow:0 0 0 3px rgba(47,143,107,.24)}
  50%{box-shadow:0 0 0 6px rgba(47,143,107,.05)}
}

.navtoggle{
  display:none;
  align-items:center;
  gap:8px;
  min-height:44px;
  padding:9px 14px;
  border:1px solid var(--line-light);
  border-radius:var(--pill);
  background:rgba(220,235,242,.12);
  color:var(--pearl);
  font-size:14px;
  font-weight:600;
  cursor:pointer;
  transition:background .18s var(--ease);
}
.navtoggle:hover{background:rgba(220,235,242,.22)}

.navtoggle__bars{
  position:relative;
  display:block;
  width:16px;
  height:2px;
  border-radius:2px;
  background:currentColor;
  transition:background .18s var(--ease);
}
.navtoggle__bars::before,
.navtoggle__bars::after{
  content:"";
  position:absolute;
  left:0;
  width:16px;
  height:2px;
  border-radius:2px;
  background:currentColor;
  transition:transform .22s var(--ease),top .22s var(--ease);
}
.navtoggle__bars::before{top:-5px}
.navtoggle__bars::after{top:5px}

.site-header[data-open="true"] .navtoggle__bars{background:transparent}
.site-header[data-open="true"] .navtoggle__bars::before{top:0;transform:rotate(45deg)}
.site-header[data-open="true"] .navtoggle__bars::after{top:0;transform:rotate(-45deg)}

.scroll-progress{
  position:absolute;
  left:0;
  bottom:0;
  z-index:3;
  width:0;
  height:3px;
  border-radius:0 3px 3px 0;
  background:linear-gradient(90deg,var(--coral) 0%,var(--amber) 100%);
  pointer-events:none;
  transition:width .1s linear;
}

@media (max-width:1080px){
  .status{display:none}
}

@media (max-width:900px){
  .cmdbar__inner{
    gap:12px;
    padding:10px 18px;
    min-height:60px;
  }

  .cmdnav{
    position:absolute;
    left:0;
    right:0;
    top:100%;
    z-index:5;
    display:none;
    margin:0;
    padding:10px 16px 20px;
    max-height:min(72vh,540px);
    overflow-y:auto;
    background:var(--deep);
    border-bottom:1px solid var(--line-light);
    box-shadow:var(--shadow-2);
  }

  .site-header[data-open="true"] .cmdnav{display:block}

  .cmdnav__list{flex-direction:column;align-items:stretch;gap:2px}

  .cmdnav__link{
    padding:13px 14px;
    border-radius:14px;
    font-size:16px;
  }

  .cmdnav__link::after{
    left:14px;
    right:auto;
    width:26px;
    bottom:6px;
    transform-origin:left center;
  }

  .navtoggle{display:inline-flex}
  .cmdbar__tools{margin-inline-start:auto}
}

@media (max-width:480px){
  .cmdbar__cta{display:none}
}

/* ---------- 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:var(--sp-7);
  background:var(--midnight);
  color:rgba(253,248,240,.86);
  overflow:hidden;
  isolation:isolate;
}

.site-footer::before{
  content:"";
  position:absolute;
  right:-12%;
  bottom:-38%;
  z-index:-1;
  width:70vw;
  height:70vw;
  max-width:640px;
  max-height:640px;
  border-radius:50%;
  background:radial-gradient(circle at 32% 32%,rgba(232,90,60,.24),transparent 62%);
  pointer-events:none;
}

.site-footer::after{
  content:"";
  position:absolute;
  left:0;
  right:0;
  top:0;
  height:4px;
  background:linear-gradient(90deg,var(--coral) 0 22%,var(--coral-soft) 22% 34%,var(--palm) 34% 46%,var(--deep) 46% 100%);
}

.footer__inner{
  max-width:var(--container);
  margin-inline:auto;
  padding:64px 24px 28px;
}

.footer__grid{
  display:grid;
  grid-template-columns:1.25fr .85fr 1.1fr;
  gap:48px;
  align-items:start;
}

.footer__col{min-width:0}

.footer__col--brand .brand{margin-bottom:4px}

.footer__promise{
  margin:18px 0 20px;
  font-family:var(--font-display);
  font-weight:800;
  font-size:clamp(1.05rem,2.2vw,1.35rem);
  line-height:1.5;
  letter-spacing:-.01em;
  color:var(--pearl);
}

.chip-list{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  list-style:none;
  margin:0;
  padding:0;
}

.chip{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:5px 12px;
  border:1px solid transparent;
  border-radius:var(--pill);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.05em;
  line-height:1.5;
}
.chip--palm{background:rgba(47,143,107,.18);color:#9fe0c4;border-color:rgba(47,143,107,.42)}
.chip--amber{background:rgba(232,162,58,.16);color:#f2c883;border-color:rgba(232,162,58,.42)}
.chip--mist{background:rgba(220,235,242,.12);color:rgba(220,235,242,.92);border-color:rgba(220,235,242,.24)}

.footer__title{
  margin:0 0 16px;
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:500;
  letter-spacing:.24em;
  text-transform:uppercase;
  color:var(--coral-soft);
}

.footer__links{
  display:grid;
  gap:2px;
  list-style:none;
  margin:0;
  padding:0;
}

.footer__links a{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:7px 0;
  color:rgba(253,248,240,.82);
  font-size:15px;
  text-decoration:none;
  transition:color .18s var(--ease),transform .18s var(--ease);
}

.footer__links a::before{
  content:"";
  width:5px;
  height:5px;
  border-radius:50%;
  background:rgba(232,90,60,.55);
  transition:background .18s var(--ease);
}

.footer__links a:hover{color:var(--pearl);transform:translateX(2px)}
.footer__links a:hover::before{background:var(--coral)}

.footer__col--contact{
  position:relative;
  padding:26px 24px 24px;
  border:1px solid var(--line-light);
  border-radius:var(--r-lg);
  background:rgba(220,235,242,.06);
}

.footer__col--contact::before{
  content:"";
  position:absolute;
  left:24px;
  right:24px;
  top:0;
  height:3px;
  border-radius:0 0 3px 3px;
  background:var(--coral);
}

.contact-list{
  display:grid;
  gap:13px;
  list-style:none;
  margin:0;
  padding:0;
}

.contact-list__item{display:grid;gap:2px}

.contact-list__k{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:rgba(220,235,242,.55);
}

.contact-list__v{
  font-size:15px;
  line-height:1.55;
  color:var(--pearl);
  overflow-wrap:anywhere;
}

.footer__legal{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:10px 24px;
  margin-top:48px;
  padding-top:20px;
  border-top:1px solid var(--line-light);
  font-size:13px;
  color:rgba(220,235,242,.62);
}

.footer__copy{margin:0}

.footer__legal-links{
  display:inline-flex;
  align-items:center;
  gap:10px;
  margin:0;
}

.footer__legal-links a{
  color:rgba(220,235,242,.84);
  text-decoration:none;
  border-bottom:1px solid rgba(220,235,242,.3);
  padding-bottom:1px;
  transition:color .18s var(--ease),border-color .18s var(--ease);
}
.footer__legal-links a:hover{color:var(--coral-soft);border-color:var(--coral-soft)}

.footer__icp{
  margin:0 0 0 auto;
  font-family:var(--font-mono);
  letter-spacing:.04em;
}

@media (max-width:1000px){
  .footer__grid{grid-template-columns:1fr 1fr;gap:36px}
  .footer__col--contact{grid-column:1 / -1}
  .footer__icp{margin-left:0}
}

@media (max-width:640px){
  .site-footer{margin-top:var(--sp-6)}
  .footer__inner{padding:48px 16px 24px}
  .footer__grid{grid-template-columns:1fr;gap:32px}
  .footer__legal{margin-top:32px;flex-direction:column;align-items:flex-start;gap:8px}
}

/* ---------- 可展开内容组 ---------- */
.accordion{display:block}

.acc__item{
  border-bottom:1px solid var(--line);
}

.acc__trigger{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  width:100%;
  padding:18px 4px;
  border:0;
  background:none;
  color:var(--ink);
  font-family:var(--font-body);
  font-size:clamp(1rem,1.8vw,1.12rem);
  font-weight:600;
  line-height:1.4;
  text-align:left;
  cursor:pointer;
  transition:color .18s var(--ease);
}
.acc__trigger:hover{color:var(--deep)}

.acc__icon{
  position:relative;
  flex:0 0 auto;
  width:26px;
  height:26px;
  border-radius:50%;
  border:1px solid rgba(11,59,92,.28);
  background:var(--mist);
  transition:background .2s var(--ease),border-color .2s var(--ease),transform .2s var(--ease);
}
.acc__icon::before,
.acc__icon::after{
  content:"";
  position:absolute;
  left:50%;
  top:50%;
  width:10px;
  height:2px;
  border-radius:2px;
  background:var(--deep);
  transform:translate(-50%,-50%);
  transition:transform .2s var(--ease),background .2s var(--ease);
}
.acc__icon::after{transform:translate(-50%,-50%) rotate(90deg)}

.acc__item[data-open="true"] .acc__icon{background:var(--coral);border-color:var(--coral)}
.acc__item[data-open="true"] .acc__icon::before,
.acc__item[data-open="true"] .acc__icon::after{background:var(--ink)}
.acc__item[data-open="true"] .acc__icon::after{transform:translate(-50%,-50%) rotate(0deg)}

.acc__panel{
  display:grid;
  grid-template-rows:0fr;
  transition:grid-template-rows .26s var(--ease);
}
.acc__panel > *{overflow:hidden}
.acc__item[data-open="true"] .acc__panel{grid-template-rows:1fr}

.acc__body{
  padding:0 4px 20px;
  color:var(--ink-soft);
  max-width:68ch;
}

/* ---------- 显现 ---------- */
[data-js="on"] [data-reveal]{
  opacity:0;
  transform:translateY(14px);
  transition:opacity .4s var(--ease),transform .4s var(--ease);
}
[data-js="on"] [data-reveal].is-visible{
  opacity:1;
  transform:none;
}

/* ---------- 降低动效 ---------- */
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  html{scroll-behavior:auto}
  [data-js="on"] [data-reveal]{opacity:1;transform:none}
  .acc__panel{transition:none}
  .btn:hover{transform:none}
  .card:hover{transform:none}
  .footer__links a:hover{transform:none}
}