:root{
  --ink-night:#0A1024;
  --ink-deep:#131A3A;
  --aurora:#3FE0D0;
  --ice:#8E9AC4;
  --snow:#EDF2FF;
  --gold:#F4B860;
  --coral:#FF7A5C;
  --pearl:#F5A7C6;
  --edge:#1E2A4A;
  --ink-dark:#060A18;
  --radius:14px;
  --radius-sm:8px;
  --shadow-soft:0 18px 40px -28px rgba(6,10,24,.9);
  --shadow-lift:0 26px 60px -32px rgba(63,224,208,.34);
  --ease:cubic-bezier(.22,.68,.32,1);
  --dur:180ms;
  --sans:"PingFang SC","Hiragino Sans GB","Source Han Sans SC","Noto Sans CJK SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --mono:"Source Code Pro","JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --serif:"Songti SC","Source Han Serif SC","Noto Serif CJK SC",Georgia,serif;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body,h1,h2,h3,h4,p,ul,ol,figure,blockquote,dl,dd{margin:0}
ul,ol{list-style:none;padding:0}
html,body{min-height:100%}
body{
  background:
    radial-gradient(1100px 620px at 12% -8%,rgba(63,224,208,.14),transparent 62%),
    radial-gradient(900px 560px at 96% 6%,rgba(244,184,96,.11),transparent 60%),
    radial-gradient(760px 520px at 70% 110%,rgba(245,167,198,.09),transparent 64%),
    var(--ink-night);
  color:var(--snow);
  font-family:var(--sans);
  font-size:16px;
  line-height:1.85;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  pointer-events:none;
  z-index:0;
  opacity:.035;
  background-image:radial-gradient(rgba(237,242,255,.9) 1px,transparent 1px);
  background-size:3px 3px;
}
img,svg,video{max-width:100%;height:auto;display:block}
a{color:var(--aurora);text-decoration:none;transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease)}
a:hover{color:var(--gold)}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
:focus-visible{outline:2px solid var(--aurora);outline-offset:3px;border-radius:4px}
::selection{background:rgba(63,224,208,.3);color:var(--snow)}
h1,h2,h3,h4{font-weight:800;line-height:1.22;letter-spacing:-.01em}
h1{font-size:clamp(34px,6vw,64px);font-weight:900}
h2{font-size:clamp(24px,3.4vw,36px)}
h3{font-size:clamp(18px,2.2vw,22px);font-weight:600}
p{color:var(--snow)}
strong{color:var(--gold);font-weight:700}
code,kbd{font-family:var(--mono);font-size:.86em;color:var(--aurora)}

.skip-link{
  position:absolute;left:16px;top:-64px;z-index:120;
  padding:10px 18px;border-radius:0 0 var(--radius-sm) var(--radius-sm);
  background:var(--aurora);color:var(--ink-night);font-weight:700;
  transition:top var(--dur) var(--ease);
}
.skip-link:focus{top:0;color:var(--ink-night)}

.shell{width:100%;max-width:1180px;margin:0 auto;padding:0 20px;position:relative;z-index:2}
.shell--wide{max-width:1320px}

/* ---------- header ---------- */
.site-header{position:sticky;top:0;z-index:100}
.cmdbar{
  background:linear-gradient(180deg,rgba(10,16,36,.96),rgba(10,16,36,.86));
  backdrop-filter:blur(14px);
  border-bottom:1px solid var(--edge);
}
.cmdbar__inner{
  display:flex;align-items:center;gap:20px;
  min-height:66px;
}
.cmdbar__brand{
  display:flex;align-items:center;gap:12px;flex:0 0 auto;
  color:var(--snow);
}
.cmdbar__brand:hover{color:var(--snow)}
.cmdbar__mark{
  width:14px;height:14px;border-radius:50%;flex:0 0 auto;
  background:radial-gradient(circle at 32% 30%,var(--gold),var(--aurora) 62%,rgba(63,224,208,0) 78%);
  box-shadow:0 0 0 1px rgba(63,224,208,.4),0 0 22px rgba(244,184,96,.45);
  animation:markPulse 3.4s ease-in-out infinite;
}
@keyframes markPulse{0%,100%{box-shadow:0 0 0 1px rgba(63,224,208,.4),0 0 18px rgba(244,184,96,.36)}50%{box-shadow:0 0 0 1px rgba(63,224,208,.7),0 0 30px rgba(63,224,208,.5)}}
.cmdbar__brandtext{display:flex;flex-direction:column;line-height:1.2}
.cmdbar__name{font-weight:800;font-size:17px;letter-spacing:.02em}
.cmdbar__tagline{font-family:var(--mono);font-size:11px;letter-spacing:.16em;color:var(--ice)}
.cmdbar__cta{flex:0 0 auto;margin-left:auto}

.cmdnav{display:flex;align-items:center;gap:18px;flex:1 1 auto;min-width:0}
.cmdnav__list{display:flex;align-items:center;gap:2px;flex-wrap:wrap}
.cmdnav__item{position:relative}
.cmdnav__link{
  display:inline-flex;align-items:center;gap:6px;
  padding:9px 11px;border-radius:var(--radius-sm);
  border-bottom:1px solid transparent;
  color:var(--ice);font-size:15px;font-weight:600;white-space:nowrap;
}
.cmdnav__num{font-family:var(--mono);font-size:10.5px;letter-spacing:.12em;color:rgba(142,154,196,.72)}
.cmdnav__link:hover{color:var(--snow);background:rgba(30,42,74,.62);border-bottom-color:rgba(63,224,208,.5)}
.cmdnav__link[aria-current="page"]{color:var(--snow);border-bottom-color:var(--aurora)}
.cmdnav__link[aria-current="page"] .cmdnav__num{color:var(--gold)}

.navtoggle{
  display:none;align-items:center;gap:9px;margin-left:auto;
  padding:9px 14px;border:1px solid var(--edge);border-radius:var(--radius-sm);
  background:var(--ink-deep);color:var(--snow);font-size:13px;font-weight:600;
}
.navtoggle__bars{width:16px;height:10px;position:relative;display:inline-block}
.navtoggle__bars::before,.navtoggle__bars::after{
  content:"";position:absolute;left:0;right:0;height:1.5px;background:var(--aurora);transition:transform var(--dur) var(--ease),opacity var(--dur) var(--ease);
}
.navtoggle__bars::before{top:0}
.navtoggle__bars::after{bottom:0}
.navtoggle[aria-expanded="true"] .navtoggle__bars::before{transform:translateY(4px) rotate(45deg)}
.navtoggle[aria-expanded="true"] .navtoggle__bars::after{transform:translateY(-4.5px) rotate(-45deg)}

.scrollbar{height:2px;background:transparent}
.scrollbar__fill{display:block;height:2px;width:0;background:linear-gradient(90deg,var(--aurora),var(--gold));transition:width 90ms linear}

.annobar{border-bottom:1px solid var(--edge);background:rgba(19,26,58,.62)}
.annobar__inner{display:flex;align-items:center;gap:10px;min-height:34px;padding:6px 20px}
.annobar__pulse{
  width:7px;height:7px;border-radius:50%;flex:0 0 auto;
  background:var(--coral);box-shadow:0 0 0 3px rgba(255,122,92,.16);
  animation:markPulse 2.6s ease-in-out infinite;
}
.annobar__text{font-family:var(--mono);font-size:11.5px;letter-spacing:.08em;color:var(--ice)}

/* ---------- shared blocks ---------- */
.section{padding:76px 0;position:relative}
.section--deep{background:linear-gradient(180deg,rgba(19,26,58,.55),rgba(10,16,36,.9));border-top:1px solid var(--edge);border-bottom:1px solid var(--edge)}
.section--narrow{max-width:820px;margin:0 auto}
.section__head{margin-bottom:34px}
.section__num{font-family:var(--mono);font-size:12px;letter-spacing:.18em;color:var(--gold);display:block;margin-bottom:10px}
.section__title{margin-bottom:12px}
.section__lead{font-family:var(--serif);font-size:clamp(18px,2.1vw,24px);line-height:1.7;color:var(--ice);max-width:30em}

.grid12{display:grid;grid-template-columns:repeat(12,1fr);gap:24px}
.col-3{grid-column:span 3}
.col-4{grid-column:span 4}
.col-5{grid-column:span 5}
.col-7{grid-column:span 7}
.col-8{grid-column:span 8}
.col-9{grid-column:span 9}

.prose{max-width:36em}
.prose p{margin-bottom:1.1em;color:rgba(237,242,255,.88)}
.prose p:last-child{margin-bottom:0}
.prose ul{list-style:none;margin:0 0 1.1em}
.prose li{position:relative;padding-left:18px;margin-bottom:.5em;color:rgba(237,242,255,.86)}
.prose li::before{content:"";position:absolute;left:0;top:.72em;width:6px;height:6px;border-radius:50%;background:var(--aurora)}

.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 22px;border-radius:999px;border:1px solid var(--edge);
  background:var(--ink-deep);color:var(--snow);
  font-size:14.5px;font-weight:600;letter-spacing:.04em;
  transition:transform var(--dur) var(--ease),border-color var(--dur) var(--ease),box-shadow var(--dur) var(--ease),color var(--dur) var(--ease);
}
.btn:hover{color:var(--snow);border-color:var(--aurora);box-shadow:var(--shadow-lift);transform:translateY(-1px)}
.btn--ghost{background:transparent}
.btn--accent{
  background:linear-gradient(120deg,var(--coral),#ff9a72);
  border-color:transparent;color:#22100A;font-weight:700;
}
.btn--accent:hover{color:#22100A;box-shadow:0 22px 48px -26px rgba(255,122,92,.7)}

.crumbs{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-family:var(--mono);font-size:11.5px;letter-spacing:.1em;color:var(--ice);margin-bottom:22px}
.crumbs__item a{color:var(--ice)}
.crumbs__item a:hover{color:var(--aurora)}
.crumbs__item[aria-current="page"]{color:var(--snow)}
.crumbs__sep{color:rgba(142,154,196,.5)}

.card{
  position:relative;display:flex;flex-direction:column;
  padding:24px 22px 20px;border:1px solid var(--edge);border-radius:var(--radius);
  background:linear-gradient(170deg,rgba(19,26,58,.86),rgba(10,16,36,.9));
  box-shadow:var(--shadow-soft);
  transition:border-color var(--dur) var(--ease),box-shadow var(--dur) var(--ease),transform var(--dur) var(--ease);
}
.card::before{
  content:"";position:absolute;inset:0;border-radius:var(--radius);pointer-events:none;
  background:radial-gradient(420px 200px at 88% -20%,rgba(63,224,208,.14),transparent 68%);
  opacity:0;transition:opacity var(--dur) var(--ease);
}
.card:hover,.card:focus-within{border-color:var(--aurora);transform:translateY(-2px)}
.card:hover::before,.card:focus-within::before{opacity:1}
.card__num{font-family:var(--mono);font-size:11px;letter-spacing:.16em;color:var(--gold);margin-bottom:12px}
.card__title{font-size:19px;font-weight:700;margin-bottom:8px}
.card__text{font-size:15px;color:rgba(237,242,255,.8)}
.card__meta{margin-top:auto;padding-top:16px;border-top:1px solid var(--edge);font-family:var(--mono);font-size:11px;letter-spacing:.1em;color:var(--ice)}

.tagrow{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:26px}
.tag{
  padding:7px 14px;border:1px solid var(--edge);border-radius:999px;
  background:rgba(19,26,58,.6);color:var(--ice);font-size:13px;font-weight:600;
  transition:border-color var(--dur) var(--ease),color var(--dur) var(--ease),background var(--dur) var(--ease);
}
.tag:hover{border-color:var(--aurora);color:var(--snow)}
.tag[aria-pressed="true"]{background:rgba(63,224,208,.14);border-color:var(--aurora);color:var(--snow)}
.is-hidden{display:none !important}

.glowdot{
  width:10px;height:10px;border-radius:50%;display:inline-block;
  background:radial-gradient(circle,var(--aurora),rgba(244,184,96,.9));
  box-shadow:0 0 16px rgba(63,224,208,.5);
  opacity:.35;transition:opacity 320ms var(--ease),box-shadow 320ms var(--ease);
}
[data-reveal].is-lit .glowdot,.glowdot.is-lit{opacity:1;box-shadow:0 0 26px rgba(63,224,208,.85)}
[data-reveal]{opacity:.86;transition:opacity 420ms var(--ease)}
[data-reveal].is-lit{opacity:1}

.figure{margin:0;border:1px solid var(--edge);border-radius:var(--radius);overflow:hidden;background:var(--ink-deep);position:relative}
.figure__img{width:100%;height:auto;aspect-ratio:3/2;object-fit:cover;background:linear-gradient(150deg,var(--ink-deep),var(--ink-dark));filter:saturate(1.05)}
.figure--tall .figure__img{aspect-ratio:4/5}
.figure__cap{padding:12px 16px;border-top:1px solid var(--edge);font-family:var(--mono);font-size:11px;letter-spacing:.08em;color:var(--ice)}

.panel{border:1px solid var(--edge);border-radius:var(--radius);background:linear-gradient(165deg,rgba(19,26,58,.8),rgba(10,16,36,.92));padding:22px;box-shadow:var(--shadow-soft)}
.panel__row{display:flex;flex-wrap:wrap;gap:6px 16px;padding:12px 0;border-bottom:1px solid var(--edge)}
.panel__row:last-child{border-bottom:0;padding-bottom:0}
.panel__k{font-family:var(--mono);font-size:11.5px;letter-spacing:.12em;color:var(--gold);min-width:88px}
.panel__v{font-size:15px;color:rgba(237,242,255,.88);flex:1 1 220px}

.faq__item{border:1px solid var(--edge);border-radius:var(--radius);background:rgba(19,26,58,.5);margin-bottom:12px;overflow:hidden;transition:border-color var(--dur) var(--ease)}
.faq__item[open]{border-color:rgba(63,224,208,.55);background:rgba(19,26,58,.78)}
.faq__item summary{
  display:flex;align-items:center;gap:12px;padding:16px 20px;
  cursor:pointer;font-size:17px;font-weight:600;color:var(--snow);list-style:none;
}
.faq__item summary::-webkit-details-marker{display:none}
.faq__item summary::after{content:"+";margin-left:auto;font-family:var(--mono);color:var(--aurora);font-size:18px}
.faq__item[open] summary::after{content:"–"}
.faq__dot{width:8px;height:8px;border-radius:50%;background:var(--edge);flex:0 0 auto;transition:background var(--dur) var(--ease),box-shadow var(--dur) var(--ease)}
.faq__item[open] .faq__dot{background:var(--aurora);box-shadow:0 0 14px rgba(63,224,208,.7)}
.faq__body{padding:0 20px 18px 40px;color:rgba(237,242,255,.84);font-size:15.5px}

/* ---------- footer ---------- */
.footer{
  position:relative;margin-top:40px;
  background:linear-gradient(180deg,rgba(10,16,36,.5),rgba(6,10,24,.98) 42%);
  border-top:1px solid var(--edge);overflow:hidden;
}
.footer__glow{
  position:absolute;top:-160px;left:-80px;width:520px;height:340px;pointer-events:none;
  background:radial-gradient(circle at 30% 30%,rgba(63,224,208,.2),transparent 66%);
  filter:blur(6px);
}
.footer__inner{padding:58px 20px 30px}
.footer__brandrow{display:flex;flex-wrap:wrap;align-items:baseline;gap:14px;padding-bottom:22px;border-bottom:1px solid var(--edge)}
.footer__brand{font-size:22px;font-weight:800;letter-spacing:.02em}
.footer__slogan{font-family:var(--serif);font-size:16px;color:var(--gold)}
.footer__grid{display:grid;grid-template-columns:repeat(12,1fr);gap:26px;padding:32px 0 26px}
.footer__col{grid-column:span 3}
.footer__col--wide{grid-column:span 6}
.footer__coltitle{font-family:var(--mono);font-size:11.5px;letter-spacing:.16em;color:var(--ice);font-weight:600;margin-bottom:14px}
.footer__links li{margin-bottom:9px}
.footer__link{color:rgba(237,242,255,.82);font-size:14.5px}
.footer__link:hover{color:var(--aurora)}
.footer__contactrow{display:flex;flex-wrap:wrap;align-items:center;gap:10px;margin-bottom:10px;font-size:14.5px}
.footer__contactrow--block{align-items:flex-start}
.footer__label{font-family:var(--mono);font-size:11px;letter-spacing:.14em;color:var(--gold);min-width:40px}
.footer__addr{color:rgba(237,242,255,.8);flex:1 1 240px}
.footer__service{margin-top:14px;font-size:13px;line-height:1.8;color:var(--ice);max-width:52em}
.copybtn{
  padding:4px 10px;border:1px solid var(--edge);border-radius:999px;
  font-family:var(--mono);font-size:11px;letter-spacing:.08em;color:var(--ice);
  transition:border-color var(--dur) var(--ease),color var(--dur) var(--ease),background var(--dur) var(--ease);
}
.copybtn:hover{border-color:var(--aurora);color:var(--snow)}
.copybtn.is-copied{border-color:var(--aurora);background:rgba(63,224,208,.14);color:var(--snow)}
.footer__legal{display:flex;flex-wrap:wrap;align-items:center;gap:12px 22px;padding-top:20px;border-top:1px solid var(--edge)}
.footer__meta,.footer__note{font-family:var(--mono);font-size:11.5px;letter-spacing:.08em;color:var(--ice)}
.footer__note{flex:1 1 260px}
.totop{
  margin-left:auto;padding:8px 16px;border:1px solid var(--edge);border-radius:999px;
  font-family:var(--mono);font-size:11.5px;letter-spacing:.1em;color:var(--ice);
  opacity:0;visibility:hidden;transition:opacity var(--dur) var(--ease),visibility var(--dur) var(--ease),border-color var(--dur) var(--ease),color var(--dur) var(--ease);
}
.totop.is-visible{opacity:1;visibility:visible}
.totop:hover{border-color:var(--aurora);color:var(--snow)}

/* ---------- responsive ---------- */
@media (max-width:1080px){
  .cmdnav__link{padding:8px 8px;font-size:14px}
  .cmdnav__num{display:none}
  .footer__col{grid-column:span 4}
  .footer__col--wide{grid-column:span 12}
}
@media (max-width:880px){
  .cmdbar__inner{flex-wrap:wrap;min-height:60px;gap:12px}
  .navtoggle{display:inline-flex}
  .cmdnav{
    display:none;order:3;flex:1 1 100%;flex-direction:column;align-items:stretch;gap:14px;
    padding:16px;margin-top:2px;border:1px solid var(--edge);border-radius:var(--radius);
    background:linear-gradient(170deg,rgba(19,26,58,.98),rgba(10,16,36,.98));
    box-shadow:var(--shadow-soft);
  }
  .cmdnav[data-open="true"]{display:flex}
  .cmdnav__list{flex-direction:column;align-items:stretch;gap:4px}
  .cmdnav__num{display:inline}
  .cmdnav__link{justify-content:flex-start;padding:11px 12px;border-bottom:1px solid var(--edge);border-radius:var(--radius-sm)}
  .cmdnav__link[aria-current="page"]{background:rgba(63,224,208,.1);border-bottom-color:var(--aurora)}
  .cmdbar__cta{margin-left:0;width:100%;justify-content:center}
  .annobar__inner{padding:6px 20px}
  .annobar__text{font-size:10.5px;letter-spacing:.06em}
  .section{padding:56px 0}
  .grid12{gap:18px}
  .col-3,.col-4,.col-5,.col-7,.col-8,.col-9{grid-column:span 12}
  .footer__inner{padding:44px 20px 26px}
  .footer__col,.footer__col--wide{grid-column:span 12}
  .totop{margin-left:0}
}
@media (max-width:560px){
  body{font-size:15.5px}
  .cmdbar__tagline{display:none}
  .footer__legal{flex-direction:column;align-items:flex-start}
  .copybtn{padding:3px 9px}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation:none !important;transition-duration:1ms !important;scroll-behavior:auto !important}
  [data-reveal]{opacity:1}
  .glowdot{opacity:1}
}