:root{
  --ink:#07111F;
  --ink-2:#0D1F36;
  --card:#162D4A;
  --line:#2A4668;
  --amber:#F2B544;
  --coral:#FF6B4A;
  --jade:#58D6A2;
  --ice:#EDF4FF;
  --mist:#A7B9D3;
  --sand:#F1E6CF;
  --radius:16px;
  --radius-sm:10px;
  --wrap:1280px;
  --gutter:clamp(18px,4vw,40px);
  --yk-strip-h:46px;
  --shadow-hard:6px 6px 0 rgba(3,8,16,.55);
  --ease:cubic-bezier(.2,.7,.3,1);
  --font-sans:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"IBM Plex Mono","JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background:
    radial-gradient(1200px 620px at 82% -10%,rgba(42,70,104,.45),transparent 62%),
    var(--ink);
  color:var(--ice);
  font-family:var(--font-sans);
  font-size:17px;
  line-height:1.75;
  font-weight:400;
  letter-spacing:.005em;
  overflow-x:hidden;
}
body.is-scrolled{--yk-strip-h:34px}
img,svg{max-width:100%;height:auto;display:block}
h1,h2,h3,h4{
  font-family:var(--font-sans);
  font-weight:900;
  letter-spacing:-.035em;
  line-height:1.14;
  margin:0 0 .5em;
  color:var(--ice);
}
h1{font-size:clamp(2.5rem,6vw,6rem)}
h2{font-size:clamp(1.6rem,3.2vw,2.5rem)}
h3{font-size:clamp(1.15rem,1.8vw,1.38rem);letter-spacing:-.02em}
p{margin:0 0 1.1em;max-width:68ch}
a{color:var(--ice)}
ul,ol{padding-left:1.2em}
hr{border:0;border-top:2px solid var(--line);margin:2.4em 0}
::selection{background:var(--amber);color:var(--ink)}
:where(a,button,summary,[tabindex]):focus-visible{
  outline:3px solid var(--amber);
  outline-offset:3px;
  border-radius:8px;
}
.yk-wrap{
  width:100%;
  max-width:var(--wrap);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.yk-mono{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  letter-spacing:.04em;
  font-size:.92em;
}
.yk-eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.16em;
  color:var(--amber);
  margin:0 0 14px;
}
.yk-eyebrow::before{
  content:"";
  width:22px;
  height:2px;
  background:var(--amber);
  flex:none;
}
/* ---------- skip link ---------- */
.yk-skip{
  position:fixed;
  left:14px;
  top:-120px;
  z-index:300;
  display:inline-flex;
  align-items:center;
  min-height:48px;
  padding:0 20px;
  border-radius:10px;
  background:var(--amber);
  color:var(--ink);
  font-weight:800;
  text-decoration:none;
  transition:top .16s var(--ease);
}
.yk-skip:focus{top:14px}
/* ---------- masthead ---------- */
.yk-masthead{
  position:sticky;
  top:0;
  z-index:80;
  background:rgba(7,17,31,.94);
  backdrop-filter:blur(14px) saturate(1.1);
  -webkit-backdrop-filter:blur(14px) saturate(1.1);
  border-bottom:1px solid rgba(42,70,104,.6);
  transition:background-color .2s var(--ease),border-color .2s var(--ease);
}
body.is-scrolled .yk-masthead{
  background:rgba(7,17,31,.985);
  border-bottom-color:rgba(88,214,162,.22);
}
/* ---------- version strip ---------- */
.yk-topbar{
  background:linear-gradient(90deg,rgba(13,31,54,.98),rgba(7,17,31,.98));
  border-bottom:1px solid rgba(42,70,104,.5);
  height:var(--yk-strip-h);
  transition:height .2s var(--ease);
  overflow:hidden;
}
.yk-topbar__inner{
  display:flex;
  align-items:center;
  gap:10px;
  height:100%;
  max-width:var(--wrap);
  margin-inline:auto;
  padding-inline:var(--gutter);
  min-width:0;
}
.yk-topbar__dot{
  width:8px;
  height:8px;
  border-radius:50%;
  background:var(--jade);
  box-shadow:0 0 0 3px rgba(88,214,162,.18);
  flex:none;
}
.yk-topbar__text{
  margin:0;
  max-width:none;
  flex:1 1 auto;
  min-width:0;
  color:var(--mist);
  font-size:13px;
  line-height:1.4;
  white-space:nowrap;
  overflow:hidden;
  text-overflow:ellipsis;
}
.yk-topbar__version{color:var(--amber);font-weight:700}
/* ---------- header capsule ---------- */
.yk-header{position:relative;padding:12px 0 14px;transition:padding .2s var(--ease)}
body.is-scrolled .yk-header{padding:8px 0 10px}
.yk-header__inner{
  display:flex;
  align-items:center;
  gap:16px;
  width:calc(100% - var(--gutter) * 2);
  max-width:var(--wrap);
  margin-inline:auto;
  padding:9px 12px 9px 18px;
  border:1px solid var(--line);
  border-radius:999px;
  background:linear-gradient(135deg,rgba(22,45,74,.94),rgba(13,31,54,.9));
  box-shadow:0 16px 44px rgba(3,8,16,.55),inset 0 1px 0 rgba(237,244,255,.06);
}
.yk-brand{
  display:inline-flex;
  align-items:center;
  gap:11px;
  flex:none;
  text-decoration:none;
  color:var(--ice);
}
.yk-brand__mark{
  display:grid;
  place-items:center;
  width:38px;
  height:38px;
  border-radius:10px;
  background:linear-gradient(150deg,#FFD37A,var(--amber) 55%,#D99427);
  color:#08131F;
  font-size:18px;
  font-weight:900;
  line-height:1;
  box-shadow:3px 3px 0 rgba(242,181,68,.22);
  flex:none;
}
.yk-brand__text{display:flex;flex-direction:column;line-height:1.16;min-width:0}
.yk-brand__name{font-size:17px;font-weight:900;letter-spacing:-.02em;white-space:nowrap}
.yk-brand__meta{font-size:10.5px;letter-spacing:.14em;color:var(--mist);white-space:nowrap}
/* ---------- nav ---------- */
.yk-nav{
  flex:1 1 auto;
  display:flex;
  justify-content:center;
  min-width:0;
}
.yk-nav__list{
  display:flex;
  align-items:center;
  gap:2px;
  list-style:none;
  margin:0;
  padding:0;
  min-width:0;
}
.yk-nav__item{display:block}
.yk-nav__link{
  position:relative;
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:0 13px;
  border-radius:999px;
  color:var(--mist);
  font-size:15px;
  font-weight:600;
  text-decoration:none;
  white-space:nowrap;
  transition:color .16s var(--ease),background-color .16s var(--ease);
}
.yk-nav__link:hover{color:var(--ice);background:rgba(42,70,104,.5)}
.yk-nav__link[aria-current="page"]{color:var(--amber)}
.yk-nav__link[aria-current="page"]::before{
  content:"";
  width:6px;
  height:6px;
  border-radius:50%;
  background:var(--jade);
  margin-right:6px;
  flex:none;
}
.yk-nav__link[aria-current="page"]::after{
  content:"";
  position:absolute;
  left:13px;
  right:13px;
  bottom:7px;
  height:2px;
  border-radius:2px;
  background:var(--amber);
}
/* ---------- nav toggle ---------- */
.yk-nav-toggle{
  display:none;
  align-items:center;
  gap:9px;
  min-height:44px;
  min-width:48px;
  padding:0 14px;
  border-radius:999px;
  border:1px solid var(--line);
  background:rgba(7,17,31,.6);
  color:var(--ice);
  font-family:inherit;
  font-size:14px;
  font-weight:700;
  cursor:pointer;
  transition:border-color .16s var(--ease),color .16s var(--ease);
}
.yk-nav-toggle:hover{border-color:var(--coral);color:var(--coral)}
.yk-nav-toggle__bars{display:flex;flex-direction:column;gap:4px;width:18px;flex:none}
.yk-nav-toggle__bars span{
  display:block;
  height:2px;
  border-radius:2px;
  background:currentColor;
  transition:transform .18s var(--ease),opacity .18s var(--ease);
}
.yk-nav-toggle[aria-expanded="true"] .yk-nav-toggle__bars span:nth-child(1){transform:translateY(6px) rotate(45deg)}
.yk-nav-toggle[aria-expanded="true"] .yk-nav-toggle__bars span:nth-child(2){opacity:0}
.yk-nav-toggle[aria-expanded="true"] .yk-nav-toggle__bars span:nth-child(3){transform:translateY(-6px) rotate(-45deg)}
.yk-nav-toggle__label{white-space:nowrap}
/* ---------- header cta ---------- */
.yk-cta{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  flex:none;
  min-height:44px;
  padding:0 20px;
  border:2px solid var(--amber);
  border-radius:999px;
  background:var(--amber);
  color:var(--ink);
  font-size:14px;
  font-weight:800;
  letter-spacing:.01em;
  text-decoration:none;
  white-space:nowrap;
  transition:transform .16s var(--ease),background-color .16s var(--ease),border-color .16s var(--ease),color .16s var(--ease);
}
.yk-cta:hover{background:var(--coral);border-color:var(--coral);color:#1B0A05;transform:translateX(2px)}
/* ---------- progress ---------- */
.yk-progress{height:2px;background:rgba(42,70,104,.45);overflow:hidden}
.yk-progress__bar{
  display:block;
  height:100%;
  width:100%;
  transform:scaleX(0);
  transform-origin:0 50%;
  background:linear-gradient(90deg,var(--amber),var(--coral) 58%,var(--jade));
  transition:transform .12s linear;
}
/* ---------- buttons ---------- */
.yk-btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  min-height:48px;
  padding:0 24px;
  border:2px solid var(--amber);
  border-radius:999px;
  background:var(--amber);
  color:var(--ink);
  font-family:inherit;
  font-size:15px;
  font-weight:800;
  text-decoration:none;
  cursor:pointer;
  box-shadow:4px 4px 0 rgba(242,181,68,.18);
  transition:transform .16s var(--ease),background-color .16s var(--ease),box-shadow .16s var(--ease);
}
.yk-btn:hover{background:#FFC75E;transform:translateX(2px)}
.yk-btn--ghost{
  background:transparent;
  color:var(--ice);
  border-color:var(--line);
  box-shadow:none;
}
.yk-btn--ghost:hover{background:transparent;border-color:var(--coral);color:var(--coral)}
/* ---------- cards & panels ---------- */
.yk-card{
  position:relative;
  background:linear-gradient(160deg,rgba(22,45,74,.96),rgba(13,31,54,.96));
  border:2px solid var(--line);
  border-radius:var(--radius);
  padding:clamp(18px,2.6vw,26px);
  box-shadow:var(--shadow-hard);
  transition:transform .18s var(--ease),border-color .18s var(--ease),box-shadow .18s var(--ease);
}
.yk-card:hover{transform:translate(2px,-2px);border-color:var(--amber);box-shadow:8px 8px 0 rgba(3,8,16,.6)}
.yk-panel{
  background:var(--ink-2);
  border:2px solid var(--line);
  border-radius:var(--radius);
  padding:clamp(18px,3vw,32px);
}
/* ---------- chips / tags / status ---------- */
.yk-chip{
  display:inline-flex;
  align-items:center;
  gap:8px;
  min-height:40px;
  padding:0 16px;
  border:2px solid var(--line);
  border-radius:999px;
  background:rgba(22,45,74,.6);
  color:var(--mist);
  font-family:inherit;
  font-size:14px;
  font-weight:600;
  cursor:pointer;
  transition:border-color .16s var(--ease),color .16s var(--ease),background-color .16s var(--ease);
}
.yk-chip:hover{border-color:var(--coral);color:var(--ice)}
.yk-chip[aria-pressed="true"],.yk-chip.is-active{
  border-color:var(--jade);
  color:var(--jade);
  background:rgba(88,214,162,.1);
}
.yk-tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:3px 10px;
  border:1px solid var(--line);
  border-radius:6px;
  color:var(--mist);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  line-height:1.6;
}
.yk-tag--amber{color:var(--amber);border-color:rgba(242,181,68,.55)}
.yk-tag--jade{color:var(--jade);border-color:rgba(88,214,162,.55)}
.yk-status{
  display:inline-flex;
  align-items:center;
  gap:8px;
  color:var(--jade);
  font-size:13px;
  font-weight:600;
  line-height:1.5;
}
.yk-status::before{
  content:"";
  width:8px;
  height:8px;
  border-radius:50%;
  background:currentColor;
  box-shadow:0 0 0 3px rgba(88,214,162,.16);
  flex:none;
}
/* ---------- tables ---------- */
.yk-table-wrap{
  width:100%;
  overflow-x:auto;
  border:2px solid var(--line);
  border-radius:var(--radius);
  background:var(--card);
  -webkit-overflow-scrolling:touch;
}
.yk-table{
  width:100%;
  min-width:520px;
  border-collapse:collapse;
  font-size:15px;
  line-height:1.6;
}
.yk-table th,.yk-table td{
  padding:12px 16px;
  text-align:left;
  border-bottom:1px solid var(--line);
  vertical-align:top;
}
.yk-table th{
  background:rgba(13,31,54,.9);
  color:var(--sand);
  font-size:13px;
  font-weight:700;
  letter-spacing:.04em;
  white-space:nowrap;
}
.yk-table td{color:var(--ice)}
.yk-table tbody tr:last-child th,.yk-table tbody tr:last-child td{border-bottom:0}
.yk-table tbody tr:hover td{background:rgba(42,70,104,.28)}
/* ---------- accordion ---------- */
.yk-acc{
  border:2px solid var(--line);
  border-radius:var(--radius-sm);
  background:var(--ink-2);
  overflow:hidden;
}
.yk-acc + .yk-acc{margin-top:10px}
.yk-acc__btn{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:14px;
  width:100%;
  min-height:52px;
  padding:12px 18px;
  border:0;
  background:none;
  color:var(--ice);
  font-family:inherit;
  font-size:16px;
  font-weight:700;
  text-align:left;
  cursor:pointer;
  transition:color .16s var(--ease),background-color .16s var(--ease);
}
.yk-acc__btn:hover{background:rgba(42,70,104,.35)}
.yk-acc__btn[aria-expanded="true"]{color:var(--amber)}
.yk-acc__icon{
  flex:none;
  width:20px;
  height:20px;
  position:relative;
  color:var(--amber);
}
.yk-acc__icon::before,.yk-acc__icon::after{
  content:"";
  position:absolute;
  inset:50% 0 auto;
  height:2px;
  background:currentColor;
  border-radius:2px;
  transform:translateY(-50%);
  transition:transform .16s var(--ease),opacity .16s var(--ease);
}
.yk-acc__icon::after{transform:translateY(-50%) rotate(90deg)}
.yk-acc__btn[aria-expanded="true"] .yk-acc__icon::after{opacity:0}
.yk-acc__panel{
  padding:0 18px 18px;
  color:var(--mist);
  font-size:15px;
}
.yk-acc__panel[hidden]{display:none}
/* ---------- breadcrumbs ---------- */
.yk-crumbs{font-size:13px;color:var(--mist)}
.yk-crumbs__list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  list-style:none;
  margin:0;
  padding:0;
}
.yk-crumbs__item{display:inline-flex;align-items:center;gap:8px}
.yk-crumbs__item:not(:last-child)::after{content:"/";color:var(--line)}
.yk-crumbs__link{color:var(--mist);text-decoration:none;transition:color .16s var(--ease)}
.yk-crumbs__link:hover{color:var(--amber)}
/* ---------- figure ---------- */
.yk-figure{
  display:flex;
  flex-direction:column;
  gap:10px;
  margin:0;
}
.yk-figure__media{
  position:relative;
  aspect-ratio:16 / 9;
  overflow:hidden;
  border:2px solid var(--line);
  border-radius:var(--radius);
  background:
    radial-gradient(120% 90% at 12% 0%,rgba(88,214,162,.16),transparent 58%),
    linear-gradient(150deg,#12263F,#07111F 62%),
    var(--ink);
}
.yk-figure__media::before{
  content:"";
  position:absolute;
  inset:0;
  background-image:
    linear-gradient(rgba(167,185,211,.08) 1px,transparent 1px),
    linear-gradient(90deg,rgba(167,185,211,.08) 1px,transparent 1px);
  background-size:32px 32px;
  pointer-events:none;
}
.yk-figure__media > img,.yk-figure__media > svg{
  position:relative;
  width:100%;
  height:100%;
  object-fit:cover;
}
.yk-figure__cap{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--mist);
}
.yk-figure--square .yk-figure__media{aspect-ratio:1 / 1}
.yk-figure--wide .yk-figure__media{aspect-ratio:21 / 9}
/* ---------- grid ---------- */
.yk-grid{display:grid;gap:clamp(16px,2.4vw,26px)}
.yk-grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
/* ---------- reveal ---------- */
.yk-reveal{
  opacity:0;
  transform:translateY(12px);
  transition:opacity .5s var(--ease),transform .5s var(--ease);
  transition-delay:calc(var(--reveal-i,0) * 60ms);
}
.yk-reveal.is-visible{opacity:1;transform:none}
/* ---------- footer ---------- */
.yk-footer{
  position:relative;
  margin-top:clamp(56px,8vw,104px);
  background:var(--ink-2);
  border-top:1px solid var(--line);
  color:var(--mist);
}
.yk-footer::before{
  content:"";
  position:absolute;
  inset:0 0 auto;
  height:3px;
  background:linear-gradient(90deg,var(--amber),var(--coral) 46%,var(--jade));
}
.yk-footer__top{
  display:grid;
  grid-template-columns:1.5fr .85fr .85fr 1.25fr;
  gap:clamp(22px,4vw,48px);
  padding-block:clamp(36px,6vw,64px);
  align-items:start;
}
.yk-footer__brand{min-width:0}
.yk-brand--footer{margin-bottom:16px}
.yk-footer__summary{
  margin:0 0 12px;
  max-width:38ch;
  font-size:14.5px;
  line-height:1.7;
  color:var(--mist);
}
.yk-footer__note{
  margin:0;
  max-width:42ch;
  font-size:12.5px;
  line-height:1.65;
  color:rgba(167,185,211,.78);
}
.yk-footer__col{min-width:0}
.yk-footer__title{
  margin:0 0 12px;
  font-family:var(--font-mono);
  font-size:11.5px;
  font-weight:700;
  letter-spacing:.18em;
  color:var(--sand);
  line-height:1.5;
}
.yk-footer__list{
  display:flex;
  flex-direction:column;
  gap:2px;
  list-style:none;
  margin:0;
  padding:0;
}
.yk-footer__item{min-width:0}
.yk-footer__link{
  display:inline-flex;
  align-items:center;
  min-height:38px;
  color:var(--ice);
  font-size:15px;
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .16s var(--ease),border-color .16s var(--ease);
}
.yk-footer__link:hover{color:var(--amber);border-bottom-color:var(--amber)}
.yk-footer__col--contact .yk-footer__list + .yk-footer__note{margin-top:12px}
.yk-footer__contact{gap:12px}
.yk-footer__contact .yk-footer__item{
  display:flex;
  flex-direction:column;
  gap:2px;
}
.yk-footer__label{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.14em;
  color:rgba(167,185,211,.72);
}
.yk-footer__value{
  color:var(--ice);
  font-size:14.5px;
  line-height:1.6;
  overflow-wrap:anywhere;
}
.yk-footer__hours{
  margin:14px 0 0;
  max-width:34ch;
  font-size:12.5px;
  line-height:1.65;
  color:rgba(167,185,211,.82);
}
.yk-footer__base{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:8px 24px;
  padding-block:18px 26px;
  border-top:1px solid var(--line);
  font-size:13px;
  color:var(--mist);
}
.yk-footer__copy{margin:0;max-width:none}
.yk-footer__icp{margin:0;max-width:none;color:rgba(167,185,211,.82)}
/* ---------- responsive ---------- */
@media (max-width:1100px){
  .yk-nav__link{padding:0 10px;font-size:14px}
  .yk-footer__top{grid-template-columns:1.4fr 1fr 1fr;gap:28px}
  .yk-footer__col--contact{grid-column:1 / -1}
}
@media (max-width:900px){
  .yk-header{padding:10px 0 12px}
  .yk-header__inner{
    border-radius:22px;
    padding:10px 12px;
    gap:10px;
    flex-wrap:nowrap;
  }
  .yk-brand__mark{width:34px;height:34px;font-size:16px;border-radius:9px}
  .yk-brand__name{font-size:15.5px}
  .yk-brand__meta{display:none}
  .yk-nav-toggle{display:inline-flex;margin-left:auto}
  .yk-nav{
    position:absolute;
    top:calc(100% + 10px);
    left:var(--gutter);
    right:var(--gutter);
    display:block;
    flex:none;
    padding:14px;
    background:rgba(13,31,54,.985);
    border:1px solid var(--line);
    border-radius:20px;
    box-shadow:0 28px 64px rgba(2,6,12,.72);
    opacity:0;
    visibility:hidden;
    transform:translateY(-8px);
    transition:opacity .18s var(--ease),transform .18s var(--ease),visibility .18s;
    max-height:calc(100vh - 160px);
    overflow-y:auto;
  }
  .yk-nav[data-open="true"]{opacity:1;visibility:visible;transform:none}
  .yk-nav__list{flex-direction:column;align-items:stretch;gap:2px}
  .yk-nav__link{
    justify-content:flex-start;
    width:100%;
    min-height:48px;
    padding:0 14px;
    border-radius:12px;
    font-size:16px;
  }
  .yk-nav__link[aria-current="page"]{background:rgba(242,181,68,.1)}
  .yk-nav__link[aria-current="page"]::after{display:none}
  .yk-cta{min-height:44px;padding:0 15px;font-size:13.5px}
  .yk-footer__top{grid-template-columns:1fr 1fr;gap:26px 24px}
  .yk-footer__brand{grid-column:1 / -1}
  .yk-footer__col--contact{grid-column:1 / -1}
}
@media (max-width:720px){
  body{font-size:16px}
  .yk-topbar__text{font-size:12px}
  .yk-grid--3{grid-template-columns:1fr}
  .yk-footer__top{grid-template-columns:1fr;gap:24px}
  .yk-footer__summary,.yk-footer__note,.yk-footer__hours{max-width:none}
  .yk-footer__base{flex-direction:column;align-items:flex-start;gap:6px}
}
@media (max-width:430px){
  .yk-nav-toggle__label{display:none}
  .yk-nav-toggle{padding:0 12px}
  .yk-cta{padding:0 13px;font-size:13px}
  .yk-brand{gap:8px}
  .yk-brand__name{font-size:14.5px}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .yk-reveal{opacity:1 !important;transform:none !important}
  .yk-progress__bar{transition:none}
}