*,*::before,*::after{box-sizing:border-box}
html{
  -webkit-text-size-adjust:100%;
  scroll-padding-top:calc(var(--yta-header-h) + 14px);
}
body{margin:0}
img,svg,video{max-width:100%}

:root{
  --yta-blue-deep:#0B4A8F;
  --yta-blue-bright:#1E6FD9;
  --yta-cyan:#00A6B2;
  --yta-mist:#CDEDEA;
  --yta-warm:#F47A3C;
  --yta-ink:#0B1B2B;
  --yta-graphite:#40566B;
  --yta-paper:#F7FBFE;
  --yta-line:#D7E4EF;
  --yta-line-soft:#9FB4C6;
  --yta-violet:#6D5AE6;
  --yta-white:#FFFFFF;

  --yta-font-head:"HarmonyOS Sans SC","Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --yta-font-body:"Noto Sans SC","PingFang SC","HarmonyOS Sans SC","Microsoft YaHei",system-ui,sans-serif;
  --yta-font-mono:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  --yta-wrap:1240px;
  --yta-gutter:24px;
  --yta-pad:clamp(20px,4.4vw,40px);
  --yta-header-h:74px;
  --yta-radius:2px;
  --yta-dur:.28s;
  --yta-ease:cubic-bezier(.2,.7,.3,1);
}

body{
  background:var(--yta-paper);
  color:var(--yta-ink);
  font-family:var(--yta-font-body);
  font-size:16px;
  line-height:1.85;
  font-weight:400;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

h1,h2,h3,h4,h5,h6{
  margin:0 0 .6em;
  font-family:var(--yta-font-head);
  font-weight:700;
  letter-spacing:-.02em;
  color:var(--yta-ink);
}
h1{font-size:clamp(2.125rem,4.4vw,3rem);line-height:1.08}
h2{font-size:clamp(1.5rem,2.6vw,2rem);line-height:1.2}
h3{font-size:clamp(1.125rem,1.6vw,1.375rem);line-height:1.35}
h4{font-size:1.0625rem;line-height:1.4}
p{margin:0 0 1em}
ul,ol{margin:0 0 1em;padding-left:1.25em}
li{margin:0 0 .35em}
strong{font-weight:700}
small{font-size:14px;line-height:1.7}
code,kbd,samp{font-family:var(--yta-font-mono);font-size:.92em}
a{
  color:var(--yta-blue-bright);
  text-decoration:underline;
  text-decoration-thickness:1px;
  text-underline-offset:3px;
}
a:hover{color:var(--yta-blue-deep)}
hr{border:0;border-top:1px solid var(--yta-line);margin:2em 0}
:where(a,button,[tabindex]):focus-visible{
  outline:3px solid var(--yta-violet);
  outline-offset:3px;
  border-radius:2px;
}
[hidden]{display:none !important}

.yta-container{
  width:100%;
  max-width:var(--yta-wrap);
  margin-inline:auto;
  padding-inline:var(--yta-pad);
}

.yta-skip-link{
  position:fixed;
  top:-140px;
  left:16px;
  z-index:300;
  padding:12px 20px;
  background:var(--yta-blue-deep);
  color:var(--yta-white);
  font:600 15px/1.4 var(--yta-font-body);
  text-decoration:none;
  border-radius:var(--yta-radius);
  box-shadow:0 10px 28px -14px rgba(11,27,43,.7);
  transition:top var(--yta-dur) var(--yta-ease);
}
.yta-skip-link:focus,
.yta-skip-link:focus-visible{top:14px;color:var(--yta-white)}

/* ---------- 头部 ---------- */
.yta-header{
  position:sticky;
  top:0;
  z-index:120;
  background:rgba(247,251,254,.86);
  -webkit-backdrop-filter:blur(14px) saturate(1.15);
  backdrop-filter:blur(14px) saturate(1.15);
  border-bottom:1px solid rgba(11,74,143,.12);
  color:var(--yta-ink);
  transition:background var(--yta-dur) var(--yta-ease),
             color var(--yta-dur) var(--yta-ease),
             border-color var(--yta-dur) var(--yta-ease);
}
.yta-header[data-scrolled],
.yta-header[data-open]{
  background:var(--yta-blue-deep);
  border-bottom-color:rgba(255,255,255,.18);
  color:var(--yta-white);
}
.yta-header__inner{
  display:flex;
  align-items:center;
  gap:clamp(10px,1.8vw,26px);
  min-height:var(--yta-header-h);
}

.yta-brand{
  display:inline-flex;
  align-items:center;
  gap:10px;
  flex:none;
  color:inherit;
  text-decoration:none;
}
.yta-brand:hover{color:inherit}
.yta-brand__mark{
  position:relative;
  display:block;
  width:32px;
  height:32px;
  flex:none;
  background:var(--yta-blue-deep);
  transition:background var(--yta-dur) var(--yta-ease);
}
.yta-brand__mark::before{
  content:"";
  position:absolute;
  left:6px;right:6px;top:6px;
  height:9px;
  background:var(--yta-cyan);
}
.yta-brand__mark::after{
  content:"";
  position:absolute;
  right:6px;bottom:6px;
  width:9px;height:9px;
  background:var(--yta-warm);
}
.yta-header[data-scrolled] .yta-brand__mark,
.yta-header[data-open] .yta-brand__mark{background:rgba(255,255,255,.94)}
.yta-brand__text{display:flex;flex-direction:column;line-height:1.15}
.yta-brand__name{
  font-family:var(--yta-font-head);
  font-weight:700;
  font-size:17px;
  letter-spacing:.01em;
}
.yta-brand__tag{
  margin-top:3px;
  font-size:11.5px;
  letter-spacing:.04em;
  opacity:.72;
}

.yta-nav-toggle{
  display:none;
  align-items:center;
  gap:8px;
  margin-left:auto;
  padding:8px 14px;
  background:transparent;
  border:1px solid currentColor;
  border-radius:999px;
  color:inherit;
  font:600 14px/1.2 var(--yta-font-body);
  cursor:pointer;
}
.yta-nav-toggle__bars{
  position:relative;
  display:block;
  width:17px;
  height:11px;
  border-top:2px solid currentColor;
  border-bottom:2px solid currentColor;
}
.yta-nav-toggle__bars::after{
  content:"";
  position:absolute;
  left:0;right:0;top:50%;
  margin-top:-1px;
  height:2px;
  background:currentColor;
  transition:opacity var(--yta-dur) var(--yta-ease);
}
.yta-header[data-open] .yta-nav-toggle__bars::after{opacity:0}
.yta-nav-toggle__label{font-size:14px}

.yta-header__panel{
  display:flex;
  flex:1 1 auto;
  align-items:center;
  justify-content:space-between;
  gap:clamp(12px,2.6vw,36px);
  min-width:0;
}
.yta-nav{min-width:0}
.yta-nav__list{
  display:flex;
  align-items:center;
  gap:2px;
  margin:0;
  padding:0;
  list-style:none;
}
.yta-nav__list li{margin:0}
.yta-nav__link{
  position:relative;
  display:inline-block;
  padding:10px 12px;
  color:inherit;
  font-size:15px;
  font-weight:500;
  letter-spacing:.01em;
  text-decoration:none;
  transition:color var(--yta-dur) var(--yta-ease);
}
.yta-nav__link::after{
  content:"";
  position:absolute;
  left:12px;right:12px;bottom:6px;
  height:2px;
  background:var(--yta-cyan);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform var(--yta-dur) var(--yta-ease);
}
.yta-nav__link:hover::after,
.yta-nav__link:focus-visible::after{transform:scaleX(1)}
.yta-nav__link[aria-current="page"]{font-weight:700}
.yta-nav__link[aria-current="page"]::after{transform:scaleX(1)}
.yta-header[data-scrolled] .yta-nav__link::after,
.yta-header[data-open] .yta-nav__link::after{background:var(--yta-mist)}

.yta-header__actions{
  display:flex;
  align-items:center;
  gap:8px;
  flex:none;
}
.yta-pill{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:8px 15px;
  border:1px solid rgba(11,74,143,.26);
  border-radius:999px;
  color:inherit;
  font-size:14px;
  font-weight:500;
  line-height:1.4;
  white-space:nowrap;
  text-decoration:none;
  transition:background var(--yta-dur) var(--yta-ease),
             border-color var(--yta-dur) var(--yta-ease),
             color var(--yta-dur) var(--yta-ease);
}
.yta-pill:hover{
  background:rgba(0,166,178,.14);
  border-color:var(--yta-cyan);
  color:inherit;
}
.yta-header[data-scrolled] .yta-pill,
.yta-header[data-open] .yta-pill{border-color:rgba(255,255,255,.4)}
.yta-header[data-scrolled] .yta-pill:hover,
.yta-header[data-open] .yta-pill:hover{
  background:rgba(255,255,255,.16);
  border-color:var(--yta-mist);
  color:inherit;
}
.yta-pill--warm{
  background:var(--yta-warm);
  border-color:var(--yta-warm);
  color:var(--yta-ink);
  font-weight:600;
}
.yta-pill--warm:hover{
  background:#ff8b4f;
  border-color:#ff8b4f;
  color:var(--yta-ink);
}
.yta-header[data-scrolled] .yta-pill--warm,
.yta-header[data-open] .yta-pill--warm,
.yta-header[data-scrolled] .yta-pill--warm:hover,
.yta-header[data-open] .yta-pill--warm:hover{
  background:var(--yta-warm);
  border-color:var(--yta-warm);
  color:var(--yta-ink);
}

.yta-header__progress{
  position:absolute;
  left:0;right:0;bottom:-1px;
  height:2px;
  overflow:hidden;
  background:transparent;
  pointer-events:none;
}
.yta-header__progress > span{
  display:block;
  width:0;
  height:100%;
  background:linear-gradient(90deg,var(--yta-cyan),var(--yta-violet));
  transition:width .12s linear;
}

/* ---------- 页脚 ---------- */
.yta-footer{
  position:relative;
  margin-top:clamp(48px,7vw,96px);
  padding-top:clamp(40px,6vw,72px);
  background-color:var(--yta-blue-deep);
  background-image:
    repeating-linear-gradient(90deg,rgba(255,255,255,.055) 0 1px,transparent 1px 96px),
    repeating-linear-gradient(0deg,rgba(255,255,255,.045) 0 1px,transparent 1px 96px);
  color:rgba(247,251,254,.82);
  font-size:14px;
  line-height:1.75;
}
.yta-footer::before{
  content:"";
  position:absolute;
  left:0;top:0;
  width:min(38%,420px);
  height:2px;
  background:linear-gradient(90deg,var(--yta-cyan),rgba(0,166,178,0));
}
.yta-footer a{color:rgba(247,251,254,.86)}
.yta-footer__grid{
  display:grid;
  grid-template-columns:minmax(0,1.35fr) minmax(0,.72fr) minmax(0,.72fr);
  gap:clamp(28px,4vw,64px);
  padding-bottom:clamp(30px,4.5vw,52px);
}
.yta-footer__brand{min-width:0}
.yta-brand--footer{color:var(--yta-white)}
.yta-brand--footer .yta-brand__mark{background:rgba(255,255,255,.94)}
.yta-brand--footer .yta-brand__name{font-size:19px;color:var(--yta-white)}
.yta-brand--footer .yta-brand__tag{opacity:.62}
.yta-footer__note{
  margin:18px 0 0;
  max-width:46ch;
  color:rgba(247,251,254,.72);
  font-size:14px;
}
.yta-footer__contact{
  display:grid;
  gap:8px;
  margin-top:20px;
}
.yta-contact-row{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  gap:6px 10px;
  margin:0;
  font-size:13.5px;
}
.yta-contact-row__key{
  min-width:4.6em;
  font-family:var(--yta-font-mono);
  font-size:11.5px;
  letter-spacing:.1em;
  color:var(--yta-mist);
  opacity:.82;
}
.yta-contact-row__value{
  color:var(--yta-white);
  word-break:break-word;
}
.yta-copy{
  appearance:none;
  padding:3px 10px;
  background:transparent;
  border:1px solid rgba(255,255,255,.32);
  border-radius:999px;
  color:var(--yta-white);
  font:500 12px/1.5 var(--yta-font-body);
  cursor:pointer;
  transition:background var(--yta-dur) var(--yta-ease),
             border-color var(--yta-dur) var(--yta-ease),
             color var(--yta-dur) var(--yta-ease);
}
.yta-copy:hover{background:rgba(255,255,255,.14);border-color:var(--yta-mist)}
.yta-copy[data-copied]{
  background:var(--yta-cyan);
  border-color:var(--yta-cyan);
  color:var(--yta-ink);
}
.yta-footer__col{min-width:0}
.yta-footer__heading{
  margin:0 0 12px;
  font-family:var(--yta-font-head);
  font-size:12.5px;
  font-weight:700;
  letter-spacing:.1em;
  color:var(--yta-mist);
  text-transform:uppercase;
}
.yta-footer__links{
  margin:0;
  padding:0;
  list-style:none;
  display:grid;
  gap:0;
}
.yta-footer__links li{margin:0}
.yta-footer__links a{
  display:block;
  padding:8px 0;
  border-bottom:1px solid rgba(255,255,255,.1);
  color:rgba(247,251,254,.86);
  text-decoration:none;
  transition:color var(--yta-dur) var(--yta-ease),
             padding-left var(--yta-dur) var(--yta-ease);
}
.yta-footer__links a:hover,
.yta-footer__links a:focus-visible{color:var(--yta-white);padding-left:6px}
.yta-footer__meta{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:12px 26px;
  padding-block:20px;
  border-top:1px solid rgba(255,255,255,.14);
  color:rgba(247,251,254,.66);
  font-size:12.5px;
}
.yta-footer__legal{
  display:flex;
  flex-wrap:wrap;
  gap:6px 20px;
  margin:0;
}
.yta-footer__legal span{white-space:nowrap}
.yta-footer__back{margin:0}
.yta-footer__back a{
  color:var(--yta-white);
  text-decoration:none;
  padding-bottom:2px;
  border-bottom:1px solid var(--yta-cyan);
}
.yta-footer__back a:hover{color:var(--yta-mist)}

/* ---------- 通用排版与模块 ---------- */
.yta-section{padding-block:clamp(48px,7vw,96px)}
.yta-section--tight{padding-block:clamp(30px,4.4vw,56px)}
.yta-eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  margin:0 0 14px;
  font-family:var(--yta-font-mono);
  font-size:12px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--yta-graphite);
}
.yta-eyebrow::before{
  content:"";
  width:26px;
  height:1px;
  background:var(--yta-cyan);
}

.yta-grid{
  display:grid;
  grid-template-columns:repeat(12,minmax(0,1fr));
  gap:var(--yta-gutter);
}
.yta-grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.yta-grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.yta-grid--split{grid-template-columns:minmax(0,7fr) minmax(0,4fr);align-items:start}
.yta-grid--split-rev{grid-template-columns:minmax(0,4fr) minmax(0,7fr);align-items:start}
.yta-span-4{grid-column:span 4}
.yta-span-6{grid-column:span 6}
.yta-span-8{grid-column:span 8}

.yta-btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:14px 24px;
  background:transparent;
  border:1px solid transparent;
  border-radius:var(--yta-radius);
  font:600 16px/1 var(--yta-font-body);
  text-decoration:none;
  cursor:pointer;
  transition:background var(--yta-dur) var(--yta-ease),
             color var(--yta-dur) var(--yta-ease),
             border-color var(--yta-dur) var(--yta-ease);
}
.yta-btn--primary{background:var(--yta-blue-deep);color:var(--yta-white)}
.yta-btn--primary:hover{background:var(--yta-blue-bright);color:var(--yta-white)}
.yta-btn--ghost{
  background:transparent;
  border-color:rgba(11,74,143,.3);
  color:var(--yta-blue-deep);
}
.yta-btn--ghost:hover{
  background:rgba(11,74,143,.08);
  border-color:var(--yta-blue-bright);
  color:var(--yta-blue-deep);
}
.yta-btn--warm{background:var(--yta-warm);color:var(--yta-ink)}
.yta-btn--warm:hover{background:#ff8b4f;color:var(--yta-ink)}

.yta-tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:5px 12px;
  border-radius:999px;
  background:var(--yta-mist);
  color:var(--yta-blue-deep);
  font-size:13px;
  font-weight:500;
  line-height:1.5;
}
.yta-tag--line{
  background:transparent;
  border:1px solid var(--yta-line);
  color:var(--yta-graphite);
}
.yta-tag--warm{
  background:rgba(244,122,60,.16);
  color:#8A3D17;
}

.yta-breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  margin:0;
  padding:0;
  list-style:none;
  font-family:var(--yta-font-mono);
  font-size:13px;
  letter-spacing:.02em;
  color:var(--yta-graphite);
}
.yta-breadcrumb li{display:flex;align-items:center;gap:8px;margin:0}
.yta-breadcrumb li + li::before{content:"/";color:var(--yta-line-soft)}
.yta-breadcrumb a{color:var(--yta-graphite);text-decoration:none}
.yta-breadcrumb a:hover{color:var(--yta-blue-bright);text-decoration:underline}

.yta-prose{
  max-width:68ch;
  font-size:16px;
  line-height:1.85;
}
.yta-prose > p{color:var(--yta-ink)}
.yta-prose h2{margin-top:1.8em}
.yta-prose h3{margin-top:1.5em}
.yta-prose ul,
.yta-prose ol{padding-left:1.2em}
.yta-prose li{margin-bottom:.5em}
.yta-prose a{color:var(--yta-blue-bright);text-decoration:underline}
.yta-prose strong{color:var(--yta-ink)}

.yta-media{
  position:relative;
  display:block;
  overflow:hidden;
  aspect-ratio:16 / 9;
  background:linear-gradient(180deg,#EDF6F9,#CDEDEA);
  border:1px solid var(--yta-line);
}
.yta-media img,
.yta-media video{
  display:block;
  width:100%;
  height:100%;
  object-fit:cover;
}
.yta-media--portrait{aspect-ratio:4 / 5}
.yta-media--square{aspect-ratio:1 / 1}
.yta-media--wide{aspect-ratio:21 / 9}
.yta-media--bleed{border:0}
.yta-media[data-label]::after{
  content:attr(data-label);
  position:absolute;
  left:12px;bottom:12px;
  padding:4px 9px;
  background:rgba(247,251,254,.9);
  border:1px solid var(--yta-line);
  font:500 12px/1.4 var(--yta-font-mono);
  letter-spacing:.02em;
  color:var(--yta-graphite);
}
.yta-figure{margin:0;display:grid;gap:10px}
.yta-figure figcaption{
  font-size:14px;
  line-height:1.7;
  color:var(--yta-graphite);
}

/* ---------- 显现动效 ---------- */
html.yta-js [data-reveal]{
  opacity:0;
  transform:translateY(18px);
  transition:opacity .42s var(--yta-ease),transform .42s var(--yta-ease);
}
html.yta-js [data-reveal].is-visible{
  opacity:1;
  transform:none;
}

/* ---------- 响应式 ---------- */
@media (max-width:1080px){
  .yta-nav__link{padding:10px 9px;font-size:14px}
  .yta-brand__tag{display:none}
  .yta-pill{padding:7px 12px;font-size:13.5px}
}

@media (max-width:960px){
  .yta-nav-toggle{display:inline-flex}
  .yta-brand__tag{display:block}
  .yta-header__panel{
    position:absolute;
    left:0;right:0;top:100%;
    display:flex;
    flex-direction:column;
    align-items:stretch;
    justify-content:flex-start;
    gap:0;
    max-height:calc(100vh - var(--yta-header-h));
    max-height:calc(100dvh - var(--yta-header-h));
    overflow-y:auto;
    padding:8px var(--yta-pad) 26px;
    background:var(--yta-blue-deep);
    color:var(--yta-white);
    border-bottom:1px solid rgba(255,255,255,.16);
    box-shadow:0 28px 52px -28px rgba(11,27,43,.65);
    visibility:hidden;
    opacity:0;
    transform:translateY(-10px);
    pointer-events:none;
    transition:opacity var(--yta-dur) var(--yta-ease),
               transform var(--yta-dur) var(--yta-ease),
               visibility 0s linear var(--yta-dur);
  }
  .yta-header[data-open] .yta-header__panel{
    visibility:visible;
    opacity:1;
    transform:none;
    pointer-events:auto;
    transition:opacity var(--yta-dur) var(--yta-ease),
               transform var(--yta-dur) var(--yta-ease),
               visibility 0s linear 0s;
  }
  .yta-nav{width:100%}
  .yta-nav__list{
    flex-direction:column;
    align-items:stretch;
    gap:0;
  }
  .yta-nav__link{
    display:block;
    padding:14px 2px;
    font-size:17px;
    border-bottom:1px solid rgba(255,255,255,.12);
  }
  .yta-nav__link::after{
    left:2px;right:auto;
    width:24px;bottom:10px;
  }
  .yta-header__actions{
    flex-wrap:wrap;
    gap:8px;
    margin-top:18px;
  }
  body.yta-lock{overflow:hidden}

  .yta-grid--split,
  .yta-grid--split-rev{grid-template-columns:minmax(0,1fr)}
  .yta-grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
  .yta-span-4,
  .yta-span-6,
  .yta-span-8{grid-column:1 / -1}

  .yta-footer__grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .yta-footer__brand{grid-column:1 / -1}
}

@media (max-width:720px){
  :root{--yta-header-h:64px}
  h1{font-size:1.875rem}
  .yta-grid--2,
  .yta-grid--3{grid-template-columns:minmax(0,1fr)}
  .yta-footer{
    background-image:
      repeating-linear-gradient(90deg,rgba(255,255,255,.05) 0 1px,transparent 1px 64px);
  }
  .yta-footer__grid{grid-template-columns:minmax(0,1fr);gap:28px}
  .yta-footer__meta{justify-content:flex-start}
}

@media (max-width:520px){
  .yta-brand__tag{display:none}
  .yta-nav-toggle__label{display:none}
  .yta-header__actions .yta-pill{flex:1 1 auto;justify-content:center}
  .yta-contact-row__key{min-width:100%}
}

@media (prefers-reduced-motion:reduce){
  *,
  *::before,
  *::after{
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.01ms !important;
    scroll-behavior:auto !important;
  }
  html.yta-js [data-reveal]{
    transform:none !important;
    transition:opacity .3s linear !important;
    transition-delay:0ms !important;
  }
  .yta-header__progress > span{transition:none !important}
  .yta-skip-link{transition:none !important}
}