/* ===== DB CN Site Kit / assets/site.css ===== */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;min-height:100vh;
  font-family:var(--font-body);font-size:16px;line-height:1.75;
  color:var(--paper);
  background-color:var(--ink);
  background-image:
    radial-gradient(900px 540px at 88% -12%,rgba(15,58,74,.9),transparent 70%),
    radial-gradient(760px 460px at 2% 6%,rgba(20,71,59,.85),transparent 72%),
    repeating-linear-gradient(112deg,rgba(244,238,223,.035) 0 1px,transparent 1px 28px);
  background-attachment:fixed;
  -webkit-font-smoothing:antialiased;
}
:root{
  --ink:#0B2B24;
  --ink-2:#14473B;
  --line:#1F6553;
  --gold:#D9B36A;
  --gold-soft:#F0D9A8;
  --coral:#FF6B4A;
  --mist:#8FB6C9;
  --paper:#F4EEDF;
  --muted:#B7C9C2;
  --screen:#0F3A4A;
  --font-head:"Barlow Condensed","Noto Sans SC","Source Han Sans SC",sans-serif;
  --font-body:"Noto Sans SC","Source Han Sans SC","PingFang SC",sans-serif;
  --font-mono:"IBM Plex Mono","JetBrains Mono","Noto Sans Mono",monospace;
  --wrap:1240px;
  --pad:clamp(1.1rem,4vw,2.6rem);
  --radius-lg:34px;
  --radius-md:20px;
  --radius-pill:999px;
  --ease:cubic-bezier(.2,.7,.2,1);
}
img,svg{display:block;max-width:100%}
button{font:inherit;color:inherit}
ul,ol{margin:0;padding:0;list-style:none}
a{color:inherit;text-decoration:none}
:where(h1,h2,h3,h4,h5,p,figure){margin:0}
h1,h2,h3,h4{font-family:var(--font-head);font-weight:800;line-height:1.06;letter-spacing:-.01em;text-wrap:balance}
h1{font-size:clamp(2.4rem,5vw,4.8rem);line-height:1.02}
h2{font-size:clamp(1.8rem,3.2vw,3rem);line-height:1.12;font-weight:700}
h3{font-size:clamp(1.16rem,2vw,1.45rem);line-height:1.3;font-weight:700}
p{line-height:1.75}
::selection{background:var(--gold);color:var(--ink)}
:focus-visible{outline:2px solid var(--gold-soft);outline-offset:3px;border-radius:5px}

/* ===== skip link ===== */
.skip-link{
  position:fixed;left:clamp(.8rem,3vw,1.4rem);top:.9rem;z-index:200;
  transform:translateY(-220%);
  padding:.6rem 1.05rem;border-radius:var(--radius-pill);
  background:var(--gold);color:var(--ink);
  font-weight:700;font-size:.92rem;
  transition:transform .22s var(--ease);
}
.skip-link:focus{transform:translateY(0)}

/* ===== header ===== */
.site-header{
  position:sticky;top:0;z-index:80;
  background:linear-gradient(160deg,rgba(11,43,36,.99),rgba(20,71,59,.97) 58%,rgba(15,58,74,.96));
  border-bottom:1px solid var(--line);
  backdrop-filter:blur(6px);
}
.site-header::before{
  content:"";position:absolute;left:0;top:0;bottom:0;width:5px;pointer-events:none;
  background:linear-gradient(180deg,var(--gold),var(--coral) 45%,rgba(31,101,83,.2));
}
.site-rail{
  display:flex;align-items:center;gap:.85rem;
  padding:.4rem var(--pad);
  font-family:var(--font-mono);font-size:.66rem;letter-spacing:.12em;text-transform:uppercase;
  color:var(--muted);
  border-bottom:1px solid rgba(31,101,83,.5);
  background:linear-gradient(90deg,rgba(15,58,74,.5),transparent 62%);
}
.rail-mark{
  flex:0 0 auto;width:6px;height:6px;background:var(--gold);transform:rotate(45deg);
  box-shadow:0 0 0 3px rgba(217,179,106,.16);
}
.rail-meta{color:var(--gold-soft)}
.rail-status{margin-left:auto;color:var(--mist);letter-spacing:.1em}
.rail-version{
  flex:0 0 auto;padding:.12rem .48rem;border-radius:4px;
  background:var(--coral);color:var(--ink);
  font-weight:700;letter-spacing:.1em;
}
.site-masthead{
  position:relative;
  display:flex;align-items:center;gap:clamp(.7rem,2vw,1.7rem);
  max-width:var(--wrap);margin-inline:auto;
  padding:.58rem var(--pad) .68rem;
}
.brand{display:inline-flex;align-items:center;gap:.7rem;flex:0 0 auto;padding-block:.15rem}
.brand-mark{
  display:grid;place-items:center;width:44px;height:44px;
  border:1px solid rgba(217,179,106,.62);border-radius:12px;
  background:linear-gradient(145deg,rgba(217,179,106,.22),rgba(15,58,74,.55));
  box-shadow:inset 0 0 0 3px rgba(11,43,36,.6);
  font-family:var(--font-mono);font-size:.82rem;font-weight:700;letter-spacing:.04em;
  color:var(--gold-soft);
  transition:border-color .2s var(--ease),box-shadow .2s var(--ease);
}
.brand:hover .brand-mark{border-color:var(--gold);box-shadow:inset 0 0 0 3px rgba(11,43,36,.35),0 0 0 4px rgba(217,179,106,.12)}
.brand-text{display:flex;flex-direction:column;gap:.1rem;line-height:1.15}
.brand-name{font-family:var(--font-head);font-weight:800;font-size:clamp(.98rem,1.35vw,1.12rem);letter-spacing:.01em}
.brand-tagline{font-family:var(--font-mono);font-size:.62rem;letter-spacing:.14em;text-transform:uppercase;color:var(--muted)}
.site-nav{
  flex:1 1 auto;display:flex;justify-content:center;
  border-inline:1px solid rgba(31,101,83,.6);
}
.nav-list{display:flex;align-items:stretch;flex-wrap:nowrap}
.nav-item{display:flex;border-left:1px solid rgba(31,101,83,.42)}
.nav-item:first-child{border-left:0}
.nav-link{
  display:flex;align-items:baseline;gap:.4rem;
  padding:.5rem clamp(.45rem,1vw,.82rem);
  border:1px solid transparent;border-radius:10px;
  color:var(--paper);font-size:.93rem;
  white-space:nowrap;
  transition:color .18s var(--ease),background-color .18s var(--ease),border-color .18s var(--ease);
}
.nav-link:hover{color:var(--gold-soft);background:rgba(217,179,106,.1);border-color:rgba(217,179,106,.28)}
.nav-index{font-family:var(--font-mono);font-size:.63rem;letter-spacing:.08em;opacity:.7}
.nav-label{font-weight:500;letter-spacing:.01em}
.nav-link[aria-current="page"]{
  background:var(--gold);color:var(--ink);
  border-color:var(--gold-soft);
  box-shadow:0 8px 18px rgba(217,179,106,.18);
}
.nav-link[aria-current="page"] .nav-index{opacity:.85}
.masthead-actions{display:flex;align-items:center;gap:.55rem;flex:0 0 auto}
.site-progress{
  position:absolute;left:0;right:0;bottom:0;height:3px;z-index:3;
  background:rgba(31,101,83,.55);
}
.site-progress-bar{
  display:block;height:100%;width:var(--progress,0%);
  background:linear-gradient(90deg,var(--gold),var(--gold-soft) 55%,var(--coral));
  transition:width .1s linear;
}
.nav-toggle{
  display:none;align-items:center;gap:.5rem;
  padding:.48rem .8rem;border-radius:var(--radius-pill);
  border:1px solid rgba(217,179,106,.45);background:transparent;
  font-family:var(--font-mono);font-size:.7rem;letter-spacing:.1em;text-transform:uppercase;
  color:var(--paper);cursor:pointer;
  transition:border-color .18s var(--ease),color .18s var(--ease);
}
.nav-toggle:hover{border-color:var(--gold);color:var(--gold-soft)}
.nav-toggle-bars{display:inline-flex;flex-direction:column;gap:4px;width:16px}
.nav-toggle-bars span{display:block;height:2px;border-radius:2px;background:var(--gold);transition:transform .2s var(--ease)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:first-child{transform:translateY(3px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:last-child{transform:translateY(-3px) rotate(-45deg)}
.nav-toggle-text{white-space:nowrap}

/* ===== buttons ===== */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.5rem;
  font-family:var(--font-head);font-weight:700;font-size:.96rem;letter-spacing:.02em;
  padding:.6rem 1.12rem;border-radius:var(--radius-pill);
  border:1px solid transparent;cursor:pointer;
  transition:transform .18s var(--ease),background-color .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease),box-shadow .18s var(--ease);
}
.btn:hover{transform:translateY(-1px)}
.btn-gold{background:var(--gold);color:var(--ink);box-shadow:0 10px 22px rgba(217,179,106,.16)}
.btn-gold:hover{background:var(--gold-soft)}
.btn-outline{background:transparent;color:var(--paper);border-color:rgba(244,238,223,.35)}
.btn-outline:hover{border-color:var(--gold);color:var(--gold-soft)}
.btn-coral{background:var(--coral);color:var(--ink)}
.btn-coral:hover{background:#ff8466}

/* ===== generic layout ===== */
.wrap{width:100%;max-width:var(--wrap);margin-inline:auto;padding-inline:var(--pad)}
.section{padding-block:clamp(2.4rem,6vw,4.4rem)}
.section-head{
  display:flex;align-items:flex-end;justify-content:space-between;
  gap:1.2rem;flex-wrap:wrap;margin-bottom:clamp(1.1rem,2.4vw,1.8rem);
}
.eyebrow{
  display:inline-flex;align-items:center;gap:.6rem;
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.16em;text-transform:uppercase;
  color:var(--gold);
}
.eyebrow::before{content:"";width:26px;height:1px;background:var(--gold)}
.lead{font-size:clamp(1.02rem,1.5vw,1.18rem);line-height:1.82;color:var(--muted);max-width:60ch}
.mono{font-family:var(--font-mono);font-size:.78rem;letter-spacing:.06em;text-transform:uppercase;color:var(--muted)}
.grid{display:grid;gap:clamp(1rem,2vw,1.6rem)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.split{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,.85fr);gap:clamp(1.2rem,3vw,2.6rem);align-items:start}
.divider{height:1px;border:0;margin-block:clamp(1.2rem,3vw,2rem);background:linear-gradient(90deg,var(--line),transparent)}
.panel{
  position:relative;
  padding:clamp(1.1rem,2.4vw,1.7rem);
  border:1px solid rgba(31,101,83,.85);border-radius:var(--radius-md);
  background:linear-gradient(155deg,rgba(20,71,59,.94),rgba(11,43,36,.96));
}
.tag{
  display:inline-flex;align-items:center;gap:.4rem;
  padding:.32rem .68rem;border-radius:var(--radius-pill);
  border:1px solid rgba(217,179,106,.5);
  background:rgba(217,179,106,.08);color:var(--gold-soft);
  font-family:var(--font-mono);font-size:.68rem;letter-spacing:.08em;text-transform:uppercase;
}
.badge{
  display:inline-flex;align-items:center;
  padding:.18rem .5rem;border-radius:6px;
  background:var(--coral);color:var(--ink);
  font-family:var(--font-mono);font-size:.66rem;font-weight:700;letter-spacing:.05em;
}

/* ===== prose ===== */
.prose{max-width:68ch}
.prose p + p{margin-top:1rem}
.prose h2{margin-top:2rem}
.prose h3{margin-top:1.4rem}
.prose a{color:var(--gold-soft);text-decoration:underline;text-decoration-color:rgba(217,179,106,.5);text-underline-offset:.22em}
.prose a:hover{color:var(--gold);text-decoration-color:var(--gold)}
.prose strong{color:var(--gold-soft)}
.prose ul{list-style:disc;padding-left:1.25rem}
.prose ol{list-style:decimal;padding-left:1.25rem}
.prose li + li{margin-top:.4rem}
.prose blockquote{
  margin:1.4rem 0;padding:.9rem 1.1rem;
  border-left:3px solid var(--gold);border-radius:0 var(--radius-md) var(--radius-md) 0;
  background:rgba(20,71,59,.7);color:var(--paper);
}

/* ===== breadcrumb ===== */
.breadcrumb{font-family:var(--font-mono);font-size:.73rem;letter-spacing:.06em}
.breadcrumb-list{display:flex;flex-wrap:wrap;align-items:center;gap:.35rem}
.breadcrumb-item{display:inline-flex;align-items:center;gap:.35rem;color:var(--muted)}
.breadcrumb-item + .breadcrumb-item::before{content:"/";color:var(--line)}
.breadcrumb-link{color:var(--muted);transition:color .18s var(--ease)}
.breadcrumb-link:hover{color:var(--gold-soft)}
.breadcrumb-item[aria-current="page"]{color:var(--gold-soft)}

/* ===== media frames ===== */
.media-frame{
  position:relative;isolation:isolate;
  aspect-ratio:16 / 10;border-radius:var(--radius-md);overflow:hidden;
  border:1px solid rgba(31,101,83,.9);
  background:
    radial-gradient(120% 130% at 18% 0%,rgba(20,80,95,.95) 0%,var(--screen) 46%,var(--ink) 100%);
}
.media-frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:
    repeating-linear-gradient(115deg,rgba(244,238,223,.06) 0 1px,transparent 1px 13px),
    repeating-linear-gradient(0deg,rgba(15,58,74,.35) 0 1px,transparent 1px 34px);
}
.media-frame--tall{aspect-ratio:4 / 5}
.media-frame--square{aspect-ratio:1 / 1}
.media-frame__img{width:100%;height:100%;object-fit:cover}
.media-frame__tag{
  position:absolute;left:14px;bottom:14px;z-index:2;
  padding:.28rem .62rem;border-radius:var(--radius-pill);
  background:rgba(11,43,36,.86);border:1px solid rgba(217,179,106,.5);
  color:var(--gold-soft);font-family:var(--font-mono);font-size:.64rem;letter-spacing:.08em;text-transform:uppercase;
}

/* ===== footer ===== */
.site-footer{
  position:relative;margin-top:clamp(2.4rem,7vw,5rem);
  border-top:1px solid rgba(217,179,106,.55);
  background:linear-gradient(180deg,var(--ink-2),var(--ink) 86%);
  color:var(--paper);
}
.site-footer::before{
  content:"";position:absolute;inset:0 0 auto 0;height:10px;pointer-events:none;
  background-image:repeating-linear-gradient(90deg,rgba(31,101,83,.9) 0 1px,transparent 1px 22px);
  opacity:.9;
}
.footer-frame{
  max-width:var(--wrap);margin-inline:auto;
  padding:clamp(2.1rem,5vw,3.8rem) var(--pad) 1.3rem;
}
.footer-head{
  display:grid;grid-template-columns:minmax(0,1fr) minmax(0,.92fr);
  gap:.4rem clamp(1rem,4vw,3rem);align-items:end;
  padding-bottom:clamp(1.2rem,3vw,2rem);
  border-bottom:1px dashed rgba(31,101,83,.85);
}
.footer-kicker{
  grid-column:1 / -1;
  font-family:var(--font-mono);font-size:.7rem;letter-spacing:.16em;text-transform:uppercase;
  color:var(--mist);
}
.footer-mark{
  font-family:var(--font-head);font-weight:800;
  font-size:clamp(3.2rem,10vw,6.6rem);line-height:.82;letter-spacing:-.05em;
  color:rgba(217,179,106,.3);
}
.footer-mark span{color:var(--coral);opacity:.75;padding-inline:.06em}
.footer-statement{max-width:46ch;color:var(--muted);font-size:.96rem;line-height:1.82}
.footer-grid{
  display:grid;grid-template-columns:minmax(0,.9fr) minmax(0,.9fr) minmax(0,1.35fr);
  gap:clamp(1.3rem,4vw,3rem);
  padding-block:clamp(1.5rem,4vw,2.6rem);
}
.footer-nav,.footer-contact{min-width:0}
.footer-title{
  display:flex;align-items:center;gap:.55rem;
  margin-bottom:.9rem;
  font-family:var(--font-mono);font-size:.72rem;font-weight:600;letter-spacing:.14em;text-transform:uppercase;
  color:var(--gold);
}
.footer-title::after{content:"";flex:1 1 auto;height:1px;background:linear-gradient(90deg,rgba(217,179,106,.45),transparent)}
.footer-list{display:grid;gap:.34rem}
.footer-link{
  position:relative;display:inline-block;
  padding-block:.14rem;color:var(--paper);font-size:.95rem;
  transition:color .18s var(--ease);
}
.footer-link::after{
  content:"";position:absolute;left:0;right:100%;bottom:.05rem;height:1px;
  background:var(--gold);transition:right .22s var(--ease);
}
.footer-link:hover{color:var(--gold-soft)}
.footer-link:hover::after{right:0}
.footer-note{
  margin-top:1.1rem;max-width:26ch;padding-left:.7rem;
  border-left:2px solid var(--coral);
  font-size:.82rem;line-height:1.7;color:var(--muted);
}
.footer-lines{display:grid;gap:.15rem}
.footer-line{
  display:grid;grid-template-columns:5.6em minmax(0,1fr);gap:.55rem;
  padding-block:.32rem;
  border-bottom:1px dashed rgba(31,101,83,.5);
  font-size:.89rem;line-height:1.65;
}
.mono-key{font-family:var(--font-mono);font-size:.67rem;letter-spacing:.08em;text-transform:uppercase;color:var(--gold)}
.footer-value{color:var(--paper);overflow-wrap:anywhere}
.footer-base{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:.7rem 1.5rem;margin-top:clamp(1.2rem,3vw,2rem);padding-top:1.05rem;
  border-top:1px solid rgba(31,101,83,.7);
  font-family:var(--font-mono);font-size:.71rem;letter-spacing:.06em;color:var(--muted);
}
.footer-copy,.footer-code{margin:0}
.to-top{
  display:inline-flex;align-items:center;gap:.45rem;
  padding:.38rem .82rem;border-radius:var(--radius-pill);
  border:1px solid rgba(217,179,106,.55);background:transparent;
  font-family:var(--font-mono);font-size:.69rem;letter-spacing:.08em;text-transform:uppercase;
  color:var(--gold);cursor:pointer;
  transition:background-color .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease);
}
.to-top:hover{background:rgba(217,179,106,.16)}
.to-top[data-visible]{background:var(--gold);color:var(--ink);border-color:var(--gold-soft)}

/* ===== scroll-spy protocol (page stage) ===== */
[data-spy] a[aria-current="location"]{color:var(--gold-soft);border-color:var(--gold)}

/* ===== responsive ===== */
@media (max-width:1180px){
  .nav-link{font-size:.87rem;padding-inline:.5rem}
  .nav-index{display:none}
  .brand-tagline{font-size:.58rem}
}
@media (max-width:980px){
  .site-masthead{gap:.6rem;padding-block:.55rem .6rem}
  .site-nav{
    position:absolute;left:0;right:0;top:100%;z-index:6;
    display:none;justify-content:flex-start;
    max-height:calc(100vh - 7rem);overflow:auto;
    padding:.5rem var(--pad) 1rem;
    border-inline:0;border-block:1px solid var(--line);
    background:linear-gradient(180deg,var(--ink-2),var(--ink));
    box-shadow:0 26px 44px rgba(0,0,0,.38);
  }
  .site-nav[data-open]{display:block}
  .nav-list{flex-direction:column;align-items:stretch}
  .nav-item{display:block;border-left:0;border-top:1px solid rgba(31,101,83,.6)}
  .nav-item:first-child{border-top:0}
  .nav-link{
    justify-content:flex-start;gap:.6rem;
    padding:.8rem .2rem;border-radius:8px;border-left:3px solid transparent;border-bottom:0;
    font-size:.98rem;
  }
  .nav-index{display:inline}
  .nav-link:hover{background:rgba(217,179,106,.08)}
  .nav-link[aria-current="page"]{
    background:rgba(217,179,106,.14);color:var(--gold-soft);
    border-left-color:var(--gold);border-radius:0 8px 8px 0;
    box-shadow:none;
  }
  .nav-toggle{display:inline-flex}
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
  .split{grid-template-columns:minmax(0,1fr)}
  .footer-head{grid-template-columns:minmax(0,1fr);gap:.6rem}
  .footer-statement{max-width:none}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-contact{grid-column:1 / -1}
}
@media (max-width:720px){
  .gradient-unused{display:none}
  .rail-status{display:none}
  .footer-grid{grid-template-columns:minmax(0,1fr);gap:1.5rem}
  .footer-contact{grid-column:auto}
  .grid--2,.grid--3{grid-template-columns:minmax(0,1fr)}
  .footer-line{grid-template-columns:5rem minmax(0,1fr);font-size:.86rem}
}
@media (max-width:640px){
  .masthead-actions .btn-gold{display:none}
  .brand-tagline{display:none}
  .brand-mark{width:38px;height:38px;border-radius:10px;font-size:.74rem}
  .site-rail{font-size:.6rem;letter-spacing:.1em;gap:.6rem}
  .footer-base{flex-direction:column;align-items:flex-start;gap:.6rem}
}

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  html{scroll-behavior:auto}
  .btn:hover{transform:none}
}