:root{
  --sk-deep:#071426;
  --sk-obsidian:#03070D;
  --sk-nebula:#0E2A47;
  --sk-cyan:#5FF2FF;
  --sk-orange:#FF8A3D;
  --sk-violet:#A78BFA;
  --sk-white:#F4F7FF;
  --sk-orbit:#8CA0B3;
  --sk-teal:#1F6F78;
  --sk-amber:#FFC857;

  --sk-ink-soft:#C6D4E2;
  --sk-line:rgba(140,160,179,.24);
  --sk-line-cyan:rgba(95,242,255,.38);

  --sk-font-head:"Space Grotesk","HarmonyOS Sans SC","Noto Sans SC",system-ui,-apple-system,sans-serif;
  --sk-font-body:"Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --sk-font-mono:"JetBrains Mono","IBM Plex Mono",SFMono-Regular,ui-monospace,monospace;

  --sk-max:1240px;
  --sk-gutter:clamp(1rem,4vw,3.25rem);
  --sk-radius-s:10px;
  --sk-radius-m:18px;
  --sk-radius-l:26px;
  --sk-ease:cubic-bezier(.22,.7,.28,1);
  --sk-speed:160ms;
  color-scheme:dark;
}

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

html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:110px;
  background:var(--sk-obsidian);
}

body{
  margin:0;
  min-height:100vh;
  font-family:var(--sk-font-body);
  font-size:16px;
  line-height:1.75;
  color:var(--sk-white);
  letter-spacing:.01em;
  background-color:var(--sk-deep);
  background-image:
    linear-gradient(rgba(140,160,179,.055) 1px,transparent 1px),
    linear-gradient(90deg,rgba(140,160,179,.055) 1px,transparent 1px),
    radial-gradient(1100px 560px at 84% -12%,rgba(167,139,250,.16),transparent 70%),
    radial-gradient(900px 520px at -6% 4%,rgba(95,242,255,.10),transparent 66%);
  background-size:72px 72px,72px 72px,auto,auto;
  background-repeat:repeat,repeat,no-repeat,no-repeat;
}

img,svg,video{display:block;max-width:100%;}
button,input,select,textarea{font:inherit;color:inherit;}
ul,ol{margin:0;padding:0;list-style:none;}
p{margin:0 0 1em;}
p:last-child{margin-bottom:0;}
a{color:var(--sk-cyan);text-underline-offset:3px;}
[hidden]{display:none !important;}

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

::selection{background:rgba(95,242,255,.28);color:var(--sk-white);}

h1,h2,h3,h4,h5,h6{
  margin:0;
  font-family:var(--sk-font-head);
  font-weight:700;
  line-height:1.16;
  letter-spacing:-.012em;
  color:var(--sk-white);
  text-wrap:balance;
}
h1{font-size:clamp(2.4rem,5vw,4.8rem);}
h2{font-size:clamp(1.8rem,3vw,2.8rem);}
h3{font-size:clamp(1.24rem,1.7vw,1.62rem);font-weight:650;}
h4{font-size:1.06rem;font-weight:650;}
strong{font-weight:650;color:var(--sk-white);}

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

/* ---------- 基础布局与工具 ---------- */
.sk-container{
  width:100%;
  max-width:var(--sk-max);
  margin-inline:auto;
  padding-inline:var(--sk-gutter);
}

.sk-main{display:block;}

.sk-section{padding-block:clamp(2rem,5vw,3.6rem);}

.sk-mono{
  font-family:var(--sk-font-mono);
  font-variant-numeric:tabular-nums;
  letter-spacing:.08em;
}

.sk-visually-hidden{
  position:absolute !important;
  width:1px;height:1px;
  padding:0;margin:-1px;
  overflow:hidden;
  clip-path:inset(50%);
  white-space:nowrap;
  border:0;
}

.sk-divider{
  height:1px;
  border:0;
  margin:clamp(1.6rem,4vw,2.6rem) 0;
  background:linear-gradient(90deg,transparent,var(--sk-line-cyan),rgba(167,139,250,.4),transparent);
}

/* ---------- 按钮 ---------- */
.sk-btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.45rem;
  padding:.62rem 1.1rem;
  border-radius:999px;
  border:1px solid transparent;
  font-family:var(--sk-font-body);
  font-size:.88rem;
  font-weight:600;
  line-height:1.3;
  letter-spacing:.02em;
  text-decoration:none;
  white-space:nowrap;
  cursor:pointer;
  transition:background var(--sk-speed) var(--sk-ease),color var(--sk-speed) var(--sk-ease),
             border-color var(--sk-speed) var(--sk-ease),box-shadow var(--sk-speed) var(--sk-ease),
             transform var(--sk-speed) var(--sk-ease);
}
.sk-btn--primary{
  color:#220d00;
  background:linear-gradient(118deg,var(--sk-orange),#ffb277);
  border-color:rgba(255,138,61,.65);
  box-shadow:0 12px 26px -18px rgba(255,138,61,.95);
}
.sk-btn--primary:hover{
  transform:translateY(-1px);
  box-shadow:0 18px 30px -18px rgba(255,138,61,1);
}
.sk-btn--ghost{
  color:var(--sk-cyan);
  border-color:rgba(95,242,255,.42);
  background:rgba(95,242,255,.07);
}
.sk-btn--ghost:hover{
  background:rgba(95,242,255,.16);
  border-color:rgba(95,242,255,.72);
}
.sk-btn--quiet{
  color:var(--sk-ink-soft);
  border-color:var(--sk-line);
  background:rgba(140,160,179,.06);
}
.sk-btn--quiet:hover{
  color:var(--sk-white);
  border-color:rgba(140,160,179,.55);
  background:rgba(140,160,179,.14);
}

/* ---------- 标签 ---------- */
.sk-chip{
  display:inline-flex;
  align-items:center;
  gap:.35rem;
  padding:.2rem .62rem;
  border-radius:999px;
  border:1px solid var(--sk-line);
  background:rgba(140,160,179,.08);
  color:var(--sk-ink-soft);
  font-family:var(--sk-font-mono);
  font-size:.68rem;
  letter-spacing:.12em;
  line-height:1.6;
}
.sk-chip--cyan{color:#d8feff;border-color:rgba(95,242,255,.45);background:rgba(95,242,255,.12);}
.sk-chip--violet{color:#e4dcff;border-color:rgba(167,139,250,.45);background:rgba(167,139,250,.14);}
.sk-chip--orange{color:#ffe7d5;border-color:rgba(255,138,61,.45);background:rgba(255,138,61,.14);}

/* ---------- 章节引导标号 ---------- */
.sk-kicker{
  display:inline-flex;
  align-items:center;
  gap:.6rem;
  margin:0 0 .85rem;
  font-family:var(--sk-font-mono);
  font-size:.72rem;
  font-weight:500;
  letter-spacing:.24em;
  text-transform:uppercase;
  color:var(--sk-cyan);
}
.sk-kicker::before{
  content:"";
  width:22px;
  height:1px;
  background:currentColor;
  opacity:.8;
}

/* ---------- 网格 ---------- */
.sk-grid{display:grid;gap:clamp(1rem,2.4vw,1.75rem);grid-template-columns:1fr;}
@media (min-width:680px){
  .sk-grid--2,
  .sk-grid--3,
  .sk-grid--4{grid-template-columns:repeat(2,minmax(0,1fr));}
}
@media (min-width:1024px){
  .sk-grid--3{grid-template-columns:repeat(3,minmax(0,1fr));}
  .sk-grid--4{grid-template-columns:repeat(4,minmax(0,1fr));}
}

/* ---------- 卡片 ---------- */
.sk-card{
  position:relative;
  display:flex;
  flex-direction:column;
  gap:.55rem;
  padding:clamp(1.1rem,2vw,1.6rem);
  border:1px solid var(--sk-line);
  border-radius:var(--sk-radius-m);
  background:linear-gradient(155deg,rgba(14,42,71,.72),rgba(3,7,13,.84));
  transition:border-color var(--sk-speed) var(--sk-ease),transform var(--sk-speed) var(--sk-ease),
             box-shadow var(--sk-speed) var(--sk-ease);
}
.sk-card:hover{
  border-color:var(--sk-line-cyan);
  transform:translateY(-2px);
  box-shadow:0 24px 46px -34px rgba(95,242,255,.6);
}
.sk-card__label{
  font-family:var(--sk-font-mono);
  font-size:.68rem;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--sk-orange);
}
.sk-card__title{
  margin:0;
  font-family:var(--sk-font-head);
  font-size:1.16rem;
  font-weight:650;
  color:var(--sk-white);
}
.sk-card__text{margin:0;font-size:.94rem;line-height:1.72;color:var(--sk-ink-soft);}
.sk-card__meta{
  display:flex;
  flex-wrap:wrap;
  gap:.4rem;
  margin-top:auto;
  padding-top:.5rem;
  font-family:var(--sk-font-mono);
  font-size:.68rem;
  letter-spacing:.12em;
  color:var(--sk-orbit);
}

/* ---------- 图片容器 ---------- */
.sk-media{
  position:relative;
  display:block;
  width:100%;
  aspect-ratio:16/10;
  overflow:hidden;
  border:1px solid var(--sk-line);
  border-radius:var(--sk-radius-m);
  isolation:isolate;
  background:
    radial-gradient(120% 100% at 50% 0%,rgba(95,242,255,.16),transparent 62%),
    radial-gradient(86% 84% at 82% 92%,rgba(167,139,250,.2),transparent 66%),
    linear-gradient(158deg,var(--sk-nebula),var(--sk-obsidian));
}
.sk-media::before{
  content:"";
  position:absolute;
  inset:0;
  z-index:0;
  background-image:
    linear-gradient(rgba(140,160,179,.1) 1px,transparent 1px),
    linear-gradient(90deg,rgba(140,160,179,.1) 1px,transparent 1px);
  background-size:44px 44px;
  opacity:.55;
  pointer-events:none;
}
.sk-media img,
.sk-media svg{
  position:relative;
  z-index:1;
  width:100%;
  height:100%;
  object-fit:cover;
}
.sk-media--wide{aspect-ratio:21/9;}
.sk-media--square{aspect-ratio:1/1;}
.sk-media--tall{aspect-ratio:4/5;}
.sk-media__caption{
  margin-top:.6rem;
  font-family:var(--sk-font-mono);
  font-size:.7rem;
  letter-spacing:.1em;
  color:var(--sk-orbit);
}

/* ---------- 面包屑 ---------- */
.sk-breadcrumb{padding-block:.4rem 0;}
.sk-breadcrumb__list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:.45rem;
  font-family:var(--sk-font-mono);
  font-size:.7rem;
  letter-spacing:.12em;
  color:var(--sk-orbit);
}
.sk-breadcrumb__item{display:inline-flex;align-items:center;gap:.45rem;}
.sk-breadcrumb__link{
  color:var(--sk-orbit);
  text-decoration:none;
  transition:color var(--sk-speed) var(--sk-ease);
}
.sk-breadcrumb__link:hover{color:var(--sk-cyan);}
.sk-breadcrumb__sep{color:rgba(140,160,179,.5);}
.sk-breadcrumb [aria-current="page"]{color:var(--sk-white);}

/* ---------- 长文 ---------- */
.sk-prose{max-width:70ch;font-size:1.01rem;line-height:1.88;color:var(--sk-ink-soft);}
.sk-prose > * + *{margin-top:1.1em;}
.sk-prose p{margin:0;}
.sk-prose h2,.sk-prose h3{margin:1.8em 0 .6em;color:var(--sk-white);}
.sk-prose h2:first-child,.sk-prose h3:first-child{margin-top:0;}
.sk-prose a{
  color:var(--sk-cyan);
  text-decoration:none;
  border-bottom:1px solid rgba(95,242,255,.4);
}
.sk-prose a:hover{border-bottom-color:var(--sk-cyan);}
.sk-prose ul{list-style:disc;padding-left:1.35em;}
.sk-prose ol{list-style:decimal;padding-left:1.35em;}
.sk-prose li{margin:.32em 0;}
.sk-prose blockquote{
  margin:1.4em 0;
  padding:.15em 0 .15em 1.1em;
  border-left:2px solid var(--sk-violet);
  color:var(--sk-white);
}
.sk-prose code{
  font-family:var(--sk-font-mono);
  font-size:.88em;
  padding:.1em .38em;
  border:1px solid rgba(95,242,255,.22);
  border-radius:6px;
  background:rgba(95,242,255,.1);
  color:#d8feff;
}

/* ---------- 页头 ---------- */
.sk-header{
  position:sticky;
  top:0;
  z-index:60;
  color:var(--sk-white);
  border-bottom:1px solid var(--sk-line);
  background:linear-gradient(180deg,rgba(3,7,13,.96),rgba(7,20,38,.9));
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
  transition:background var(--sk-speed) var(--sk-ease),box-shadow var(--sk-speed) var(--sk-ease);
}
.sk-header::before{
  content:"";
  position:absolute;
  inset:0 0 auto 0;
  height:5px;
  opacity:.32;
  pointer-events:none;
  background-image:repeating-linear-gradient(90deg,rgba(95,242,255,.55) 0 1px,transparent 1px 12px);
}
.sk-header[data-scrolled]{
  background:linear-gradient(180deg,rgba(3,7,13,.99),rgba(7,20,38,.97));
  box-shadow:0 20px 42px -36px #000,0 1px 0 rgba(95,242,255,.2);
}

.sk-skip{
  position:absolute;
  left:var(--sk-gutter);
  top:.45rem;
  z-index:80;
  padding:.5rem .95rem;
  border-radius:8px;
  background:var(--sk-cyan);
  color:#001318;
  font-size:.85rem;
  font-weight:700;
  text-decoration:none;
  transform:translateY(-180%);
  transition:transform var(--sk-speed) var(--sk-ease);
}
.sk-skip:focus{transform:translateY(0);outline:2px solid var(--sk-white);outline-offset:2px;}

.sk-header__inner{
  display:flex;
  flex-direction:column;
  gap:.75rem;
  padding-block:1rem .65rem;
}

.sk-header__meta{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:.6rem clamp(.7rem,2vw,1.4rem);
  padding-top:.35rem;
}

.sk-brand{
  display:inline-flex;
  align-items:center;
  gap:.7rem;
  color:var(--sk-white);
  text-decoration:none;
  min-width:0;
}
.sk-brand__mark{
  position:relative;
  flex:0 0 auto;
  width:32px;
  height:32px;
  display:grid;
  place-items:center;
  border:1px solid rgba(95,242,255,.55);
  border-radius:9px;
  background:radial-gradient(circle at 50% 46%,rgba(95,242,255,.24),transparent 72%);
  box-shadow:inset 0 0 14px rgba(95,242,255,.2);
}
.sk-brand__mark::before,
.sk-brand__mark::after{
  content:"";
  position:absolute;
  background:rgba(95,242,255,.38);
}
.sk-brand__mark::before{width:1px;height:16px;left:50%;transform:translateX(-50%);}
.sk-brand__mark::after{height:1px;width:16px;top:50%;transform:translateY(-50%);}
.sk-brand__core{
  width:6px;
  height:6px;
  border-radius:50%;
  background:var(--sk-cyan);
  box-shadow:0 0 10px rgba(95,242,255,.9);
  animation:sk-pulse 3.8s ease-in-out infinite;
}
@keyframes sk-pulse{
  0%,100%{opacity:1;transform:scale(1);}
  50%{opacity:.55;transform:scale(.78);}
}
.sk-brand__text{display:flex;flex-direction:column;gap:.1rem;min-width:0;}
.sk-brand__name{
  font-family:var(--sk-font-head);
  font-size:1.02rem;
  font-weight:700;
  line-height:1.2;
  letter-spacing:.03em;
}
.sk-brand__sub{
  font-family:var(--sk-font-mono);
  font-size:.62rem;
  letter-spacing:.24em;
  text-transform:uppercase;
  color:var(--sk-orbit);
}

.sk-version{
  display:inline-flex;
  align-items:center;
  gap:.5rem;
  margin:0;
  padding:.3rem .72rem;
  border:1px solid rgba(167,139,250,.42);
  border-radius:999px;
  background:rgba(167,139,250,.11);
  color:#ded3ff;
  font-size:.72rem;
  letter-spacing:.06em;
  line-height:1.6;
}
.sk-version__dot{
  width:6px;
  height:6px;
  border-radius:50%;
  background:var(--sk-amber);
  box-shadow:0 0 8px rgba(255,200,87,.85);
}

.sk-header__actions{
  display:flex;
  align-items:center;
  gap:.55rem;
  margin-left:auto;
}

.sk-nav-toggle{
  display:none;
  align-items:center;
  gap:.5rem;
  margin-left:auto;
  padding:.5rem .8rem;
  border:1px solid rgba(95,242,255,.42);
  border-radius:999px;
  background:rgba(95,242,255,.08);
  color:var(--sk-cyan);
  font-size:.82rem;
  font-weight:600;
  cursor:pointer;
  transition:background var(--sk-speed) var(--sk-ease),border-color var(--sk-speed) var(--sk-ease);
}
.sk-nav-toggle:hover{background:rgba(95,242,255,.18);border-color:rgba(95,242,255,.7);}
.sk-nav-toggle__bars{display:grid;gap:4px;width:16px;}
.sk-nav-toggle__bars span{
  display:block;
  height:1.5px;
  border-radius:2px;
  background:currentColor;
  transition:transform var(--sk-speed) var(--sk-ease),opacity var(--sk-speed) var(--sk-ease);
}
.sk-nav-toggle[aria-expanded="true"] .sk-nav-toggle__bars span:first-child{transform:translateY(2.75px) rotate(45deg);}
.sk-nav-toggle[aria-expanded="true"] .sk-nav-toggle__bars span:last-child{transform:translateY(-2.75px) rotate(-45deg);}
.sk-nav-toggle__label{line-height:1;}

.sk-header__nav-row{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:1.25rem;
  padding-top:.6rem;
  border-top:1px solid var(--sk-line);
}

.sk-nav-helper{
  display:inline-flex;
  align-items:center;
  gap:.5rem;
  margin:0;
  font-size:.78rem;
  letter-spacing:.04em;
  color:var(--sk-orbit);
}
.sk-nav-helper__tag{
  font-family:var(--sk-font-mono);
  font-size:.62rem;
  letter-spacing:.2em;
  color:var(--sk-amber);
  border:1px solid rgba(255,200,87,.35);
  border-radius:5px;
  padding:.02rem .35rem;
}

.sk-nav{min-width:0;}
.sk-nav__list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:clamp(.8rem,2.2vw,1.7rem);
  counter-reset:navidx;
}
.sk-nav__item{
  display:flex;
  align-items:center;
  gap:.4rem;
  counter-increment:navidx;
}
.sk-nav__item::before{
  content:counter(navidx,decimal-leading-zero);
  font-family:var(--sk-font-mono);
  font-size:.6rem;
  letter-spacing:.1em;
  color:rgba(140,160,179,.55);
}
.sk-nav__link{
  position:relative;
  display:inline-flex;
  align-items:center;
  padding:.5rem .05rem;
  font-size:.94rem;
  color:var(--sk-orbit);
  text-decoration:none;
  transition:color var(--sk-speed) var(--sk-ease);
}
.sk-nav__link::after{
  content:"";
  position:absolute;
  left:0;right:0;bottom:.18rem;
  height:1px;
  background:currentColor;
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform var(--sk-speed) var(--sk-ease);
}
.sk-nav__link:hover{color:var(--sk-white);}
.sk-nav__link:hover::after{transform:scaleX(1);}
.sk-nav__link[aria-current="page"]{color:var(--sk-cyan);}
.sk-nav__link[aria-current="page"]::after{
  transform:scaleX(1);
  background:var(--sk-cyan);
  box-shadow:0 0 8px rgba(95,242,255,.7);
}

.sk-progress{
  position:absolute;
  left:0;right:0;bottom:0;
  height:2px;
  overflow:hidden;
  background:rgba(140,160,179,.16);
}
.sk-progress__bar{
  display:block;
  height:100%;
  width:0;
  background:linear-gradient(90deg,var(--sk-cyan),var(--sk-violet) 58%,var(--sk-orange));
  transition:width .12s linear;
}

/* ---------- 页脚 ---------- */
.sk-footer{
  position:relative;
  overflow:hidden;
  color:var(--sk-orbit);
  border-top:1px solid var(--sk-line);
  background:
    radial-gradient(720px 320px at 10% 0%,rgba(95,242,255,.1),transparent 70%),
    radial-gradient(640px 320px at 94% 8%,rgba(167,139,250,.14),transparent 72%),
    linear-gradient(180deg,var(--sk-obsidian),#010306 68%,var(--sk-obsidian));
}
.sk-footer::before{
  content:"";
  position:absolute;
  inset:0 0 auto 0;
  height:1px;
  opacity:.6;
  background:linear-gradient(90deg,transparent,var(--sk-cyan),var(--sk-violet),transparent);
}
.sk-footer__inner{
  position:relative;
  z-index:1;
  padding-block:clamp(2.4rem,6vw,4rem) 1.4rem;
}
.sk-footer__grid{
  display:grid;
  grid-template-columns:1.5fr repeat(3,minmax(0,1fr));
  gap:clamp(1.5rem,3vw,2.6rem);
}
.sk-footer__brand{display:flex;flex-direction:column;gap:.6rem;max-width:36ch;}
.sk-footer__mark{
  width:fit-content;
  margin:0;
  padding:.28rem .64rem;
  border:1px solid rgba(95,242,255,.32);
  border-radius:999px;
  background:rgba(95,242,255,.07);
  color:var(--sk-cyan);
  font-size:.68rem;
  letter-spacing:.18em;
}
.sk-footer__name{
  margin:0;
  font-family:var(--sk-font-head);
  font-size:1.14rem;
  font-weight:700;
  line-height:1.35;
  color:var(--sk-white);
}
.sk-footer__summary{margin:0;font-size:.9rem;line-height:1.72;color:var(--sk-orbit);}
.sk-footer__stamp{
  margin:0;
  font-family:var(--sk-font-mono);
  font-size:.68rem;
  letter-spacing:.13em;
  color:rgba(140,160,179,.85);
}
.sk-footer__col{display:flex;flex-direction:column;gap:.7rem;min-width:0;}
.sk-footer__title{
  display:flex;
  align-items:center;
  gap:.5rem;
  margin:0;
  font-family:var(--sk-font-mono);
  font-size:.68rem;
  font-weight:500;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--sk-cyan);
}
.sk-footer__title::before{
  content:"";
  width:14px;
  height:1px;
  background:var(--sk-cyan);
  opacity:.7;
}
.sk-footer__links{display:flex;flex-direction:column;gap:.42rem;}
.sk-footer__link{
  display:inline-flex;
  align-items:center;
  gap:.45rem;
  font-size:.92rem;
  color:var(--sk-ink-soft);
  text-decoration:none;
  transition:color var(--sk-speed) var(--sk-ease);
}
.sk-footer__link::before{
  content:"";
  width:0;
  height:1px;
  background:var(--sk-orange);
  transition:width var(--sk-speed) var(--sk-ease);
}
.sk-footer__link:hover{color:var(--sk-white);}
.sk-footer__link:hover::before{width:12px;}

.sk-footer__contact{
  display:grid;
  grid-template-columns:auto minmax(0,1fr);
  gap:.75rem clamp(1rem,3vw,2rem);
  margin-top:clamp(1.6rem,4vw,2.4rem);
  padding:clamp(1rem,2vw,1.35rem);
  border:1px solid var(--sk-line);
  border-radius:var(--sk-radius-m);
  background:linear-gradient(150deg,rgba(14,42,71,.5),rgba(3,7,13,.55));
}
.sk-footer__contact-label{
  margin:0;
  font-family:var(--sk-font-mono);
  font-size:.66rem;
  letter-spacing:.24em;
  text-transform:uppercase;
  color:var(--sk-violet);
  padding-top:.2rem;
}
.sk-footer__contact-list{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:.55rem 1.25rem;
}
.sk-footer__item{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  gap:.3rem .5rem;
  min-width:0;
}
.sk-footer__key{
  font-family:var(--sk-font-mono);
  font-size:.64rem;
  letter-spacing:.16em;
  color:var(--sk-orbit);
  border:1px solid var(--sk-line);
  border-radius:6px;
  padding:.05rem .34rem;
}
.sk-footer__val{
  font-size:.88rem;
  color:var(--sk-white);
  overflow-wrap:anywhere;
}
.sk-copy{
  appearance:none;
  cursor:pointer;
  padding:.1rem .5rem;
  border:1px solid rgba(95,242,255,.3);
  border-radius:999px;
  background:rgba(95,242,255,.08);
  color:var(--sk-cyan);
  font-family:var(--sk-font-mono);
  font-size:.64rem;
  letter-spacing:.12em;
  line-height:1.6;
  transition:background var(--sk-speed) var(--sk-ease),color var(--sk-speed) var(--sk-ease),
             border-color var(--sk-speed) var(--sk-ease);
}
.sk-copy:hover{background:rgba(95,242,255,.2);border-color:rgba(95,242,255,.62);}
.sk-copy[data-copied]{
  background:rgba(31,111,120,.85);
  border-color:rgba(95,242,255,.55);
  color:#e8ffff;
}
.sk-footer__note{
  grid-column:1 / -1;
  margin:0;
  padding-top:.75rem;
  border-top:1px dashed var(--sk-line);
  font-size:.8rem;
  line-height:1.72;
  color:rgba(140,160,179,.92);
}

.sk-footer__bottom{
  display:flex;
  flex-wrap:wrap;
  justify-content:space-between;
  gap:.4rem 1.5rem;
  margin-top:clamp(1.4rem,3vw,2rem);
  padding-top:1rem;
  border-top:1px solid var(--sk-line);
}
.sk-footer__legal{
  margin:0;
  font-family:var(--sk-font-mono);
  font-size:.7rem;
  letter-spacing:.1em;
  color:rgba(140,160,179,.85);
}

/* ---------- 显现协议 ---------- */
html[data-reveal-ready] [data-reveal]{
  opacity:0;
  transform:translateY(14px);
  transition:opacity .5s var(--sk-ease),transform .5s var(--sk-ease);
}
html[data-reveal-ready] [data-reveal].is-visible{
  opacity:1;
  transform:none;
}

/* ---------- 响应式 ---------- */
@media (max-width:1024px){
  .sk-footer__grid{grid-template-columns:repeat(2,minmax(0,1fr));}
  .sk-footer__brand{grid-column:1 / -1;max-width:none;}
  .sk-footer__contact-list{grid-template-columns:repeat(2,minmax(0,1fr));}
}

@media (max-width:920px){
  .sk-nav-toggle{display:inline-flex;}
  .sk-header__actions{margin-left:0;}
  .sk-header__nav-row{
    display:none;
    flex-direction:column;
    align-items:stretch;
    gap:.9rem;
    margin-top:.85rem;
    padding:1rem 1rem 1.15rem;
    border:1px solid var(--sk-line);
    border-radius:var(--sk-radius-m);
    background:linear-gradient(165deg,rgba(14,42,71,.96),rgba(3,7,13,.98));
    box-shadow:0 26px 52px -36px #000;
  }
  .sk-header__nav-row[data-open]{display:flex;}
  .sk-nav__list{flex-direction:column;align-items:stretch;gap:0;}
  .sk-nav__item{
    padding:.55rem .1rem;
    border-bottom:1px solid rgba(140,160,179,.16);
  }
  .sk-nav__item:last-child{border-bottom:0;}
  .sk-nav__link{flex:1;padding:.2rem 0;font-size:1rem;}
  .sk-nav__link::after{display:none;}
  .sk-nav-helper{order:-1;}
}

@media (max-width:640px){
  .sk-brand__name{font-size:.96rem;}
  .sk-brand__sub{letter-spacing:.16em;font-size:.58rem;}
  .sk-header__actions{width:100%;order:5;}
  .sk-header__actions .sk-btn{flex:1 1 0;padding:.58rem .7rem;font-size:.82rem;}
  .sk-footer__grid{grid-template-columns:1fr;}
  .sk-footer__contact{grid-template-columns:1fr;}
  .sk-footer__contact-list{grid-template-columns:1fr;}
  .sk-footer__bottom{flex-direction:column;}
}

@media (max-width:400px){
  .sk-version{font-size:.66rem;padding:.24rem .55rem;}
}

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