*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body,h1,h2,h3,h4,h5,p,ul,ol,dl,dd,figure,blockquote{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
table{border-collapse:collapse;width:100%}
input,select,textarea{font:inherit}

:root{
  --sk-deep:#0B1F3A;
  --sk-deep-2:#16304F;
  --sk-paper:#F6F4EE;
  --sk-coral:#FF6B4A;
  --sk-coral-soft:#FFB3A0;
  --sk-teal:#2EC4B6;
  --sk-mist:#9FB0C4;
  --sk-ink:#1C2430;
  --sk-amber:#E8A33D;
  --sk-line:#3E5A75;
  --sk-font-display:"Helvetica Neue",Arial,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --sk-font-body:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --sk-font-mono:"SFMono-Regular",Menlo,Consolas,"Roboto Mono","Courier New",monospace;
  --sk-header-h:88px;
  --sk-wrap:1280px;
  --sk-gutter:clamp(16px,4vw,48px);
  --sk-ease:cubic-bezier(.22,.61,.36,1);
  --sk-cut:14px;
}

html{scroll-padding-top:calc(var(--sk-header-h) + 16px)}
@media (prefers-reduced-motion:no-preference){html{scroll-behavior:smooth}}

body{
  background:var(--sk-deep);
  color:var(--sk-paper);
  font-family:var(--sk-font-body);
  font-size:16px;
  line-height:1.75;
  font-weight:400;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}

:focus-visible{outline:2px solid var(--sk-teal);outline-offset:3px}
.sk-section--paper :focus-visible,.sk-panel--paper :focus-visible{outline-color:var(--sk-coral)}

.sk-wrap{width:100%;max-width:var(--sk-wrap);margin-inline:auto;padding-inline:var(--sk-gutter)}

#main-content{padding-top:var(--sk-header-h)}
#main-content.sk-main-flush{padding-top:0}

/* ---------- skip link ---------- */
.sk-skip{
  position:absolute;left:12px;top:-70px;z-index:220;
  padding:12px 20px;background:var(--sk-coral);color:var(--sk-deep);
  font-size:14px;font-weight:600;letter-spacing:.08em;
  clip-path:polygon(10px 0,100% 0,100% calc(100% - 10px),calc(100% - 10px) 100%,0 100%,0 10px);
  transition:top .22s var(--sk-ease);
}
.sk-skip:focus{top:12px}

/* ---------- header ---------- */
.sk-header{
  position:fixed;top:0;left:0;right:0;z-index:120;
  background:transparent;
  border-bottom:1px solid transparent;
  transition:background .3s var(--sk-ease),border-color .3s var(--sk-ease);
}
.sk-header[data-state="solid"],
.sk-header[data-nav-open]{
  background:rgba(11,31,58,.96);
  border-bottom-color:var(--sk-line);
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
}
.sk-header__inner{
  display:grid;
  grid-template-columns:auto minmax(0,1fr) auto;
  grid-template-areas:"lead nav meta";
  align-items:center;
  gap:clamp(12px,2vw,36px);
  min-height:var(--sk-header-h);
  padding-block:10px;
}
.sk-header__lead{grid-area:lead;display:flex;flex-direction:column;gap:4px;min-width:0}

.sk-brand{display:inline-flex;align-items:center;gap:8px}
.sk-brand::before{
  content:"";width:10px;height:22px;flex:none;background:var(--sk-coral);
  clip-path:polygon(62% 0,100% 0,38% 100%,0 100%);
}
.sk-brand__mark{
  font-family:var(--sk-font-display);font-weight:800;font-size:22px;
  letter-spacing:.18em;text-transform:uppercase;font-stretch:semi-condensed;
  color:var(--sk-paper);line-height:1;
}
.sk-brand__cn{font-size:12px;letter-spacing:.34em;color:var(--sk-teal);line-height:1}
.sk-brand--footer .sk-brand__mark{font-size:28px}
.sk-brand--footer::before{height:28px;width:12px}

.sk-cursor{
  display:flex;align-items:center;gap:8px;
  font-family:var(--sk-font-mono);font-size:11px;letter-spacing:.16em;
  color:var(--sk-mist);text-transform:uppercase;line-height:1.2;
}
.sk-cursor__key{color:var(--sk-coral);letter-spacing:.24em}

.sk-index-toggle{
  grid-area:toggle;display:none;align-items:center;gap:10px;
  padding:9px 14px;border:1px solid var(--sk-line);
  color:var(--sk-paper);font-size:13px;letter-spacing:.12em;
  clip-path:polygon(8px 0,100% 0,100% calc(100% - 8px),calc(100% - 8px) 100%,0 100%,0 8px);
  transition:border-color .2s var(--sk-ease),color .2s var(--sk-ease);
}
.sk-index-toggle:hover{border-color:var(--sk-teal);color:var(--sk-teal)}
.sk-index-toggle__bars{display:inline-flex;flex-direction:column;gap:4px;width:16px}
.sk-index-toggle__bars i{display:block;height:1px;width:16px;background:var(--sk-teal);transition:transform .22s var(--sk-ease)}
.sk-index-toggle[aria-expanded="true"] .sk-index-toggle__bars i:first-child{transform:translateY(2.5px) rotate(24deg)}
.sk-index-toggle[aria-expanded="true"] .sk-index-toggle__bars i:last-child{transform:translateY(-2.5px) rotate(-24deg)}
.sk-index-toggle__text{white-space:nowrap}

.sk-nav{grid-area:nav;display:flex;flex-direction:column;gap:8px;min-width:0}
.sk-nav__list{display:flex;flex-wrap:wrap;align-items:center;justify-content:center;gap:2px 18px}
.sk-nav__item{min-width:0}
.sk-nav__link{
  position:relative;display:inline-flex;align-items:baseline;gap:7px;
  padding:6px 2px;font-size:14px;font-weight:500;letter-spacing:.04em;
  color:var(--sk-paper);opacity:.82;
  transition:opacity .2s var(--sk-ease),color .2s var(--sk-ease);
}
.sk-nav__link::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:2px;
  background:var(--sk-teal);transform:scaleX(0);transform-origin:left;
  transition:transform .24s var(--sk-ease);
}
.sk-nav__link:hover{opacity:1}
.sk-nav__link:hover::after{transform:scaleX(1)}
.sk-nav__link[aria-current="page"]{opacity:1;color:var(--sk-teal)}
.sk-nav__link[aria-current="page"]::after{transform:scaleX(1)}
.sk-nav__num{font-family:var(--sk-font-mono);font-size:10px;letter-spacing:.14em;color:var(--sk-mist)}
.sk-nav__link[aria-current="page"] .sk-nav__num{color:var(--sk-teal)}
.sk-nav__extra{
  display:flex;flex-wrap:wrap;justify-content:center;gap:6px 18px;
  font-family:var(--sk-font-mono);font-size:11px;letter-spacing:.14em;color:var(--sk-mist);
}
.sk-nav__extra-link{padding-bottom:2px;border-bottom:1px solid transparent;transition:color .2s var(--sk-ease),border-color .2s var(--sk-ease)}
.sk-nav__extra-link:hover{color:var(--sk-teal);border-bottom-color:var(--sk-teal)}

.sk-header__meta{grid-area:meta;display:flex;align-items:center;gap:12px}
.sk-tag{
  display:inline-flex;align-items:center;padding:5px 11px;
  font-family:var(--sk-font-mono);font-size:11px;letter-spacing:.14em;
  border:1px solid var(--sk-line);color:var(--sk-mist);white-space:nowrap;
  clip-path:polygon(8px 0,100% 0,100% calc(100% - 8px),calc(100% - 8px) 100%,0 100%,0 8px);
}
.sk-tag--version{color:var(--sk-teal);border-color:rgba(46,196,182,.5)}

.sk-header__progress{
  position:absolute;left:0;bottom:0;height:2px;width:0;
  background:linear-gradient(90deg,var(--sk-teal),var(--sk-coral));
  transition:width .12s linear;pointer-events:none;
}

/* ---------- buttons ---------- */
.sk-cta{
  display:inline-flex;align-items:center;gap:8px;
  padding:10px 18px;font-size:13px;font-weight:600;letter-spacing:.08em;
  background:var(--sk-coral);color:var(--sk-deep);border:1px solid var(--sk-coral);
  clip-path:polygon(10px 0,100% 0,100% calc(100% - 10px),calc(100% - 10px) 100%,0 100%,0 10px);
  transition:background .2s var(--sk-ease),border-color .2s var(--sk-ease),color .2s var(--sk-ease),transform .2s var(--sk-ease);
}
.sk-cta:hover{background:var(--sk-coral-soft);border-color:var(--sk-coral-soft);transform:translateY(-2px)}
.sk-cta--ghost{background:transparent;color:var(--sk-paper);border-color:var(--sk-line)}
.sk-cta--ghost:hover{background:transparent;color:var(--sk-teal);border-color:var(--sk-teal)}

.sk-btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:13px 24px;font-size:14px;font-weight:600;letter-spacing:.08em;
  background:var(--sk-coral);color:var(--sk-deep);border:1px solid var(--sk-coral);
  clip-path:polygon(10px 0,100% 0,100% calc(100% - 10px),calc(100% - 10px) 100%,0 100%,0 10px);
  transition:background .2s var(--sk-ease),border-color .2s var(--sk-ease),color .2s var(--sk-ease),transform .2s var(--sk-ease);
}
.sk-btn:hover{background:var(--sk-coral-soft);border-color:var(--sk-coral-soft);transform:translateY(-2px)}
.sk-btn[data-copied]{background:var(--sk-teal);border-color:var(--sk-teal)}
.sk-btn--ghost{background:transparent;color:var(--sk-paper);border-color:var(--sk-line)}
.sk-btn--ghost:hover{background:transparent;color:var(--sk-teal);border-color:var(--sk-teal)}
.sk-btn--paper{background:var(--sk-ink);border-color:var(--sk-ink);color:var(--sk-paper)}
.sk-btn--paper:hover{background:var(--sk-coral);border-color:var(--sk-coral);color:var(--sk-deep)}

/* ---------- footer ---------- */
.sk-footer{background:#081729;border-top:1px solid var(--sk-line);color:var(--sk-paper)}
.sk-footer__inner{padding-block:clamp(40px,6vw,72px) 0}
.sk-footer__top{
  display:flex;flex-wrap:wrap;align-items:center;gap:18px 28px;
  padding-bottom:28px;border-bottom:1px solid var(--sk-line);
}
.sk-footer__lead{flex:1 1 280px;max-width:52ch;font-size:14px;line-height:1.7;color:var(--sk-mist)}
.sk-footer__grid{
  display:grid;grid-template-columns:repeat(4,minmax(0,1fr));
  gap:clamp(24px,4vw,56px);padding:36px 0 40px;
}
.sk-footer__title{
  font-family:var(--sk-font-mono);font-size:12px;font-weight:500;
  letter-spacing:.2em;text-transform:uppercase;color:var(--sk-teal);margin-bottom:14px;
}
.sk-footer__list{display:flex;flex-direction:column;gap:10px}
.sk-footer__link{
  font-size:14px;color:var(--sk-paper);opacity:.8;
  border-bottom:1px solid transparent;
  transition:opacity .2s var(--sk-ease),color .2s var(--sk-ease),border-color .2s var(--sk-ease);
}
.sk-footer__link:hover{opacity:1;color:var(--sk-coral);border-bottom-color:var(--sk-coral)}
.sk-footer__datum{font-family:var(--sk-font-mono);font-size:13px;letter-spacing:.04em;color:var(--sk-mist);word-break:break-word}
.sk-footer__note{margin-top:12px;font-size:13px;line-height:1.7;color:var(--sk-mist)}
.sk-footer__bottom{
  display:flex;flex-wrap:wrap;justify-content:space-between;gap:10px 28px;
  padding:18px 0 26px;border-top:1px solid var(--sk-line);
  font-family:var(--sk-font-mono);font-size:12px;letter-spacing:.08em;color:var(--sk-mist);
}
.sk-footer__legal,.sk-footer__meta,.sk-footer__trace{margin:0}
.sk-footer__meta{color:var(--sk-teal)}
.sk-footer__trace{
  flex:1 1 100%;padding-top:12px;margin-top:2px;
  border-top:1px dashed rgba(62,90,117,.7);
  font-size:11px;letter-spacing:.12em;color:var(--sk-mist);opacity:.85;
}

/* ---------- sections & type ---------- */
.sk-section{position:relative;padding-block:clamp(56px,8vw,104px)}
.sk-section--deep{background:var(--sk-deep)}
.sk-section--panel{background:var(--sk-deep-2)}
.sk-section--paper{background:var(--sk-paper);color:var(--sk-ink)}
.sk-rule{height:1px;border:0;background:var(--sk-line);margin:0}

.sk-eyebrow{
  display:inline-block;font-family:var(--sk-font-mono);font-size:12px;
  letter-spacing:.24em;text-transform:uppercase;color:var(--sk-teal);
}
.sk-display{
  font-family:var(--sk-font-display);font-weight:800;font-stretch:semi-condensed;
  font-size:clamp(2.4rem,7.5vw,5.6rem);line-height:.94;letter-spacing:-.015em;
  text-transform:uppercase;
}
.sk-h2{font-size:clamp(1.6rem,3.4vw,2.6rem);font-weight:700;line-height:1.16;letter-spacing:-.005em}
.sk-h3{font-size:clamp(1.12rem,2vw,1.4rem);font-weight:600;line-height:1.32}
.sk-index-num{font-family:var(--sk-font-mono);font-size:12px;letter-spacing:.14em;color:var(--sk-mist)}
.sk-mono{font-family:var(--sk-font-mono);letter-spacing:.08em}
.sk-muted{color:var(--sk-mist)}

.sk-prose{max-width:68ch;font-size:16px;line-height:1.75}
.sk-prose>*+*{margin-top:1.1em}
.sk-prose h2{font-size:1.5rem;line-height:1.3;font-weight:700;margin-top:1.8em}
.sk-prose h3{font-size:1.15rem;line-height:1.4;font-weight:600;margin-top:1.5em}
.sk-prose a{color:var(--sk-coral);border-bottom:1px solid currentColor}
.sk-prose ul li{position:relative;padding-left:20px}
.sk-prose ul li+li{margin-top:.5em}
.sk-prose ul li::before{content:"";position:absolute;left:0;top:.78em;width:9px;height:1px;background:var(--sk-teal)}
.sk-prose blockquote{
  padding:14px 0 14px 20px;border-left:2px solid var(--sk-coral);
  color:var(--sk-mist);font-size:15px;
}
.sk-section--paper .sk-prose blockquote{color:#4A5866}

/* ---------- grid ---------- */
.sk-grid{display:grid;gap:clamp(20px,3vw,40px)}
.sk-grid--split{grid-template-columns:minmax(0,3fr) minmax(0,9fr)}
.sk-grid--aside{grid-template-columns:minmax(0,4fr) minmax(0,8fr)}
.sk-grid--thirds{grid-template-columns:repeat(3,minmax(0,1fr))}

/* ---------- panel ---------- */
.sk-panel{
  position:relative;padding:clamp(20px,3vw,32px);
  background:var(--sk-deep-2);border:1px solid var(--sk-line);
  clip-path:polygon(var(--sk-cut) 0,100% 0,100% calc(100% - var(--sk-cut)),calc(100% - var(--sk-cut)) 100%,0 100%,0 var(--sk-cut));
}
.sk-panel--paper{background:var(--sk-paper);color:var(--sk-ink);border-color:rgba(28,36,48,.18)}

/* ---------- figure / media ---------- */
.sk-figure{display:flex;flex-direction:column;gap:10px;margin:0}
.sk-figure__frame{
  position:relative;overflow:hidden;background:var(--sk-deep-2);
  border:1px solid var(--sk-line);aspect-ratio:16/9;width:100%;
  clip-path:polygon(var(--sk-cut) 0,100% 0,100% calc(100% - var(--sk-cut)),calc(100% - var(--sk-cut)) 100%,0 100%,0 var(--sk-cut));
}
.sk-figure__frame>img,
.sk-figure__frame>picture>img,
.sk-figure__frame>svg{width:100%;height:100%;object-fit:cover}
.sk-figure__cap{
  font-family:var(--sk-font-mono);font-size:12px;letter-spacing:.08em;color:var(--sk-mist);
}
.sk-figure--wide .sk-figure__frame{aspect-ratio:21/9}
.sk-figure--portrait .sk-figure__frame{aspect-ratio:4/5}
.sk-figure--square .sk-figure__frame{aspect-ratio:1/1}
.sk-figure--map .sk-figure__frame{
  aspect-ratio:16/7;
  background-color:#0E2542;
  background-image:
    linear-gradient(rgba(62,90,117,.45) 1px,transparent 1px),
    linear-gradient(90deg,rgba(62,90,117,.45) 1px,transparent 1px),
    radial-gradient(circle at 68% 42%,rgba(46,196,182,.22),transparent 58%),
    radial-gradient(circle at 22% 72%,rgba(255,107,74,.18),transparent 55%);
  background-size:40px 40px,40px 40px,auto,auto;
}

/* ---------- table ---------- */
.sk-table{width:100%;font-size:14px}
.sk-table th{
  text-align:left;padding:12px 14px;font-family:var(--sk-font-mono);
  font-size:11px;font-weight:500;letter-spacing:.16em;text-transform:uppercase;
  color:var(--sk-mist);border-bottom:1px solid var(--sk-line);white-space:nowrap;
}
.sk-table td{padding:14px;border-bottom:1px solid rgba(62,90,117,.55);vertical-align:top}
.sk-table tbody tr{transition:background .2s var(--sk-ease)}
.sk-table tbody tr:hover{background:rgba(46,196,182,.07)}

/* ---------- chips ---------- */
.sk-chip{
  display:inline-flex;align-items:center;gap:6px;padding:3px 10px;
  font-family:var(--sk-font-mono);font-size:11px;letter-spacing:.1em;
  border:1px solid currentColor;color:var(--sk-mist);
  clip-path:polygon(6px 0,100% 0,100% calc(100% - 6px),calc(100% - 6px) 100%,0 100%,0 6px);
}
.sk-chip--current{color:var(--sk-teal)}
.sk-chip--archived{color:var(--sk-amber)}

/* ---------- index rail ---------- */
.sk-index{display:flex;flex-direction:column;gap:2px}
.sk-index__link{
  position:relative;display:flex;align-items:baseline;gap:12px;
  padding:9px 12px;font-size:14px;color:var(--sk-mist);
  transition:color .2s var(--sk-ease),background .2s var(--sk-ease);
}
.sk-index__link::before{
  content:"";position:absolute;left:0;top:0;bottom:0;width:2px;background:var(--sk-teal);
  transform:scaleY(0);transform-origin:top;transition:transform .24s var(--sk-ease);
}
.sk-index__link:hover{color:var(--sk-paper);background:rgba(46,196,182,.06)}
.sk-index__link[aria-current]{color:var(--sk-teal);background:rgba(46,196,182,.08)}
.sk-index__link[aria-current]::before{transform:scaleY(1)}
.sk-index__num{font-family:var(--sk-font-mono);font-size:11px;color:var(--sk-mist)}

/* ---------- accordion ---------- */
.sk-accordion{display:flex;flex-direction:column;border-top:1px solid var(--sk-line)}
.sk-accordion__item{border-bottom:1px solid var(--sk-line)}
.sk-accordion__trigger{
  display:flex;align-items:center;gap:14px;width:100%;
  padding:18px 4px;text-align:left;font-size:16px;font-weight:500;color:inherit;
  transition:color .2s var(--sk-ease);
}
.sk-accordion__trigger:hover{color:var(--sk-coral)}
.sk-accordion__sign{
  margin-left:auto;flex:none;font-family:var(--sk-font-mono);font-size:16px;
  line-height:1;color:var(--sk-teal);transition:transform .24s var(--sk-ease);
}
.sk-accordion__trigger[aria-expanded="true"] .sk-accordion__sign{transform:rotate(45deg)}
.sk-accordion__panel{overflow:hidden;max-height:0;transition:max-height .24s var(--sk-ease)}
.sk-accordion__panel-inner{padding:0 4px 22px;font-size:15px;line-height:1.75;color:var(--sk-mist)}
.sk-section--paper .sk-accordion__panel-inner{color:#4A5866}

/* ---------- breadcrumbs ---------- */
.sk-crumbs{padding-block:18px}
.sk-crumbs__list{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-family:var(--sk-font-mono);font-size:12px;letter-spacing:.1em;color:var(--sk-mist)}
.sk-crumbs__item{display:inline-flex;align-items:center;gap:8px}
.sk-crumbs__item+.sk-crumbs__item::before{content:"/";color:var(--sk-line)}
.sk-crumbs__link{color:var(--sk-mist);transition:color .2s var(--sk-ease)}
.sk-crumbs__link:hover{color:var(--sk-teal)}
.sk-crumbs__link[aria-current="page"],.sk-crumbs__item[aria-current="page"]{color:var(--sk-teal)}

/* ---------- utilities ---------- */
.sk-stack{display:flex;flex-direction:column;gap:16px}
.sk-cluster{display:flex;flex-wrap:wrap;align-items:center;gap:12px 20px}

/* ---------- reveal ---------- */
.sk-js [data-reveal]{opacity:0;transform:translateY(14px);transition:opacity .5s var(--sk-ease),transform .5s var(--sk-ease)}
.sk-js [data-reveal][data-revealed]{opacity:1;transform:none}

/* ---------- responsive ---------- */
@media (max-width:1024px){
  :root{--sk-header-h:68px;--sk-cut:10px}
  .sk-header__inner{
    grid-template-columns:minmax(0,1fr) auto auto;
    grid-template-areas:"lead toggle meta";
    gap:12px;
  }
  .sk-index-toggle{display:inline-flex}
  .sk-cursor{display:none}
  .sk-nav{
    position:fixed;top:var(--sk-header-h);left:0;right:0;
    display:block;padding:0 var(--sk-gutter);
    background:rgba(8,23,41,.98);
    border:0;max-height:0;overflow:hidden;visibility:hidden;
    transition:max-height .28s var(--sk-ease),visibility .28s var(--sk-ease);
  }
  .sk-nav[data-open]{
    max-height:min(78vh,620px);overflow-y:auto;visibility:visible;
    padding-top:10px;padding-bottom:24px;
    border-top:1px solid var(--sk-line);border-bottom:1px solid var(--sk-line);
  }
  .sk-nav__list{flex-direction:column;align-items:stretch;justify-content:flex-start;gap:0}
  .sk-nav__item{border-bottom:1px solid rgba(62,90,117,.55)}
  .sk-nav__link{padding:15px 2px;font-size:16px;opacity:.9;width:100%}
  .sk-nav__link::after{display:none}
  .sk-nav__link[aria-current="page"]{padding-left:14px;box-shadow:inset 3px 0 0 var(--sk-teal);background:rgba(46,196,182,.07)}
  .sk-nav__extra{justify-content:flex-start;padding-top:18px;font-size:12px}
  .sk-footer__grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .sk-grid--split,.sk-grid--aside{grid-template-columns:1fr}
}
@media (max-width:720px){
  .sk-header__meta .sk-tag{display:none}
  .sk-grid--thirds{grid-template-columns:1fr}
}
@media (max-width:560px){
  .sk-brand__mark{font-size:19px;letter-spacing:.14em}
  .sk-header__meta{gap:8px}
  .sk-cta{padding:8px 13px;font-size:12px}
  .sk-footer__grid{grid-template-columns:1fr;gap:28px}
  .sk-footer__bottom{flex-direction:column;align-items:flex-start}
  .sk-table{font-size:13px}
  .sk-table th,.sk-table td{padding:10px}
}

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .sk-js [data-reveal]{opacity:1;transform:none}
  .sk-cta:hover,.sk-btn:hover{transform:none}
}