*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,p,ul,ol,figure,blockquote,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video{max-width:100%;height:auto;display:block}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
input,textarea,select{font:inherit}
:root{
  --paper:#ECEDE8;
  --panel:#F3EFE5;
  --ink:#111820;
  --ink-2:#2B3742;
  --red:#C83A2E;
  --red-deep:#8E1F18;
  --blue:#1F4FA8;
  --blue-deep:#112C63;
  --cyan:#53E0D2;
  --gold:#A9781F;
  --line:#C4C7BF;
  --paper-soft:rgba(236,237,232,.76);
  --paper-faint:rgba(236,237,232,.42);
  --rail-w:96px;
  --topbar-h:42px;
  --font-sans:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,"Liberation Mono",monospace;
  --mono-track:.06em;
  --ease:cubic-bezier(.22,.61,.36,1);
}
body{
  background:var(--paper);
  color:var(--ink);
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.75;
  padding-top:var(--topbar-h);
  padding-left:var(--rail-w);
  min-height:100vh;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
body.is-nav-open{overflow:hidden}
h1,h2,h3,h4{line-height:1.2;font-weight:800;letter-spacing:.01em}
strong{font-weight:800}
:focus-visible{outline:2px solid var(--blue);outline-offset:3px}
.rb-rail :focus-visible,.rb-footer :focus-visible,.rb-topbar :focus-visible{outline-color:var(--cyan)}
.rb-mono{font-family:var(--font-mono);letter-spacing:var(--mono-track);font-variant-numeric:tabular-nums}
.rb-sr{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}

/* skip link */
.rb-skip{
  position:fixed;top:0;left:0;z-index:200;
  padding:10px 18px;background:var(--cyan);color:var(--ink);
  font-family:var(--font-mono);font-size:13px;font-weight:700;letter-spacing:.05em;
  transform:translateY(-130%);transition:transform .2s var(--ease);
}
.rb-skip:focus{transform:translateY(0)}

/* header shell */
.rb-header{position:relative;z-index:110}

/* top status bar */
.rb-topbar{
  position:fixed;top:0;left:0;right:0;height:var(--topbar-h);z-index:112;
  display:flex;align-items:center;gap:clamp(8px,2vw,22px);
  padding:0 clamp(10px,2vw,18px);
  background:var(--ink);color:var(--paper);
  border-bottom:1px solid rgba(236,237,232,.14);
  font-size:12px;
}
.rb-topbar__brand{display:flex;align-items:center;gap:9px;min-width:0}
.rb-topbar__mark{
  width:18px;height:18px;flex:0 0 18px;
  background:linear-gradient(105deg,var(--red) 0 44%,var(--paper) 44% 56%,var(--blue) 56% 100%);
}
.rb-topbar__name{
  font-size:12.5px;font-weight:700;letter-spacing:.1em;white-space:nowrap;
  color:var(--paper);
}
.rb-topbar__status{display:flex;align-items:center;gap:clamp(10px,2vw,20px);margin-left:auto}
.rb-topbar__item{display:inline-flex;align-items:center;gap:7px;white-space:nowrap}
.rb-topbar__k{
  font-family:var(--font-mono);font-size:10px;letter-spacing:.16em;
  color:var(--paper-faint);
}
.rb-live{
  width:7px;height:7px;border-radius:50%;background:var(--cyan);
  box-shadow:0 0 0 0 rgba(83,224,210,.55);
  animation:rb-pulse 2.6s ease-out infinite;
}
@keyframes rb-pulse{
  0%{box-shadow:0 0 0 0 rgba(83,224,210,.55)}
  70%{box-shadow:0 0 0 7px rgba(83,224,210,0)}
  100%{box-shadow:0 0 0 0 rgba(83,224,210,0)}
}
.rb-topbar__item [data-current-section]{color:var(--cyan)}

/* mobile toggle */
.rb-nav-toggle{
  display:none;align-items:center;gap:8px;margin-left:6px;
  padding:6px 10px;border:1px solid rgba(236,237,232,.36);
  color:var(--paper);font-family:var(--font-mono);font-size:11px;
  letter-spacing:.12em;transition:background-color .2s var(--ease),border-color .2s var(--ease);
}
.rb-nav-toggle:hover{background:rgba(236,237,232,.1);border-color:rgba(236,237,232,.6)}
.rb-nav-toggle__bars{display:flex;flex-direction:column;gap:4px;width:14px}
.rb-nav-toggle__bar{display:block;height:1.5px;background:currentColor;transition:transform .22s var(--ease)}
.rb-header[data-open] .rb-nav-toggle__bar:first-child{transform:translateY(2.75px) rotate(45deg)}
.rb-header[data-open] .rb-nav-toggle__bar:last-child{transform:translateY(-2.75px) rotate(-45deg)}

/* left rail */
.rb-rail{
  position:fixed;top:var(--topbar-h);left:0;bottom:0;width:var(--rail-w);z-index:106;
  display:flex;flex-direction:column;
  background:var(--ink);color:var(--paper);
  border-right:1px solid rgba(236,237,232,.14);
  overflow-y:auto;overflow-x:hidden;
  scrollbar-width:thin;
}
.rb-brand{
  display:flex;flex-direction:column;align-items:center;gap:10px;
  padding:18px 6px 16px;
  border-bottom:1px solid rgba(236,237,232,.14);
}
.rb-brand__glyph{
  width:28px;height:28px;flex:0 0 28px;
  background:linear-gradient(105deg,var(--red) 0 44%,var(--paper) 44% 56%,var(--blue) 56% 100%);
  transform:skewX(-4deg);
}
.rb-brand__word{
  display:flex;flex-direction:column;align-items:center;gap:1px;
  font-size:12.5px;font-weight:700;letter-spacing:.16em;line-height:1.25;
}
.rb-nav{flex:1 1 auto}
.rb-nav__list{display:flex;flex-direction:column}
.rb-nav__item{border-bottom:1px solid rgba(236,237,232,.08)}
.rb-nav__link{
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:1px;
  padding:11px 4px;min-height:50px;
  color:var(--paper-soft);
  border-left:3px solid transparent;
  transition:color .2s var(--ease),background-color .2s var(--ease),border-color .2s var(--ease);
}
.rb-nav__num{
  font-family:var(--font-mono);font-size:10px;letter-spacing:.16em;
  color:var(--paper-faint);
  transition:color .2s var(--ease);
}
.rb-nav__label{font-size:12.5px;font-weight:600;letter-spacing:.02em;text-align:center}
.rb-nav__link:hover{color:#fff;background:rgba(236,237,232,.08);border-left-color:var(--gold)}
.rb-nav__link:hover .rb-nav__num{color:var(--cyan)}
.rb-nav__link[aria-current="page"]{
  background:var(--paper);color:var(--ink);border-left-color:var(--red);
}
.rb-nav__link[aria-current="page"] .rb-nav__num{color:var(--red-deep)}
.rb-rail__foot{
  margin-top:auto;display:flex;flex-direction:column;align-items:center;gap:3px;
  padding:14px 6px;border-top:1px solid rgba(236,237,232,.14);
  font-family:var(--font-mono);font-size:10px;letter-spacing:.16em;color:var(--paper-faint);
}
.rb-rail__tag{color:var(--gold)}

/* scroll progress (js) */
.rb-progress{
  position:fixed;top:0;left:0;height:3px;width:0;z-index:130;
  background:linear-gradient(90deg,var(--red) 0%,var(--blue) 100%);
  pointer-events:none;transition:width .1s linear;
}

/* container & section */
.rb-container{width:100%;max-width:1240px;margin-inline:auto;padding-inline:clamp(18px,4vw,56px)}
.rb-section{padding-block:clamp(40px,6vw,88px)}
.rb-section--tight{padding-block:clamp(24px,3.5vw,48px)}

/* grid */
.rb-grid{display:grid;gap:clamp(14px,2vw,24px)}
.rb-grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.rb-grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.rb-grid--4{grid-template-columns:repeat(4,minmax(0,1fr))}
.rb-grid--split{grid-template-columns:7fr 5fr}

/* panel */
.rb-panel{
  position:relative;
  background:var(--panel);
  border:1px solid var(--line);
  padding:clamp(20px,2.6vw,36px);
  transition:transform .2s var(--ease);
}
.rb-panel:hover{transform:translateY(-2px)}
.rb-panel--red{background:var(--panel);border-top:4px solid var(--red)}
.rb-panel--blue{background:var(--panel);border-top:4px solid var(--blue)}
.rb-panel--ink{background:var(--ink);color:var(--paper-soft);border-color:transparent}
.rb-panel--ink .rb-panel__title,.rb-panel--ink h2,.rb-panel--ink h3{color:var(--paper)}
.rb-panel__head{display:flex;align-items:baseline;gap:12px;flex-wrap:wrap;margin-bottom:16px}
.rb-panel__title{font-size:clamp(18px,2vw,22px);font-weight:800}

/* text utilities */
.rb-index{
  font-family:var(--font-mono);font-size:12px;font-weight:700;
  letter-spacing:.14em;color:var(--gold);
}
.rb-panel--ink .rb-index{color:var(--cyan)}
.rb-eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:11.5px;font-weight:600;
  letter-spacing:.16em;text-transform:uppercase;color:var(--ink-2);
}
.rb-eyebrow::before{content:"";width:22px;height:2px;background:var(--red)}
.rb-prose p{max-width:34em}
.rb-prose p+p{margin-top:1em}
.rb-prose ul{max-width:34em;margin-top:.8em;display:grid;gap:.4em}
.rb-prose li{padding-left:1.1em;position:relative}
.rb-prose li::before{content:"";position:absolute;left:0;top:.72em;width:6px;height:2px;background:var(--red)}

/* tags */
.rb-tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:3px 9px;
  font-family:var(--font-mono);font-size:11px;font-weight:600;
  letter-spacing:.1em;text-transform:uppercase;
  border:1px solid currentColor;background:transparent;color:var(--ink-2);
}
.rb-tag--red{color:var(--red-deep);border-color:var(--red);background:rgba(200,58,46,.08)}
.rb-tag--blue{color:var(--blue-deep);border-color:var(--blue);background:rgba(31,79,168,.08)}
.rb-tag--cyan{color:var(--ink);border-color:var(--cyan);background:var(--cyan)}
.rb-tag--gold{color:var(--gold);border-color:var(--gold)}
.rb-tag--ink{color:var(--paper);border-color:var(--ink);background:var(--ink)}

/* buttons */
.rb-btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 22px;border:1px solid transparent;
  font-size:15px;font-weight:700;letter-spacing:.01em;line-height:1.4;
  transition:transform .18s var(--ease),background-color .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease);
}
.rb-btn:hover{transform:translateY(-2px)}
.rb-btn--red{background:var(--red);color:#F7F2E7}
.rb-btn--red:hover{background:var(--red-deep)}
.rb-btn--blue{background:var(--blue);color:#F7F2E7}
.rb-btn--blue:hover{background:var(--blue-deep)}
.rb-btn--ink{background:var(--ink);color:var(--paper)}
.rb-btn--ink:hover{background:var(--ink-2)}
.rb-btn--ghost{background:transparent;color:var(--ink);border-color:var(--ink)}
.rb-btn--ghost:hover{background:var(--ink);color:var(--paper)}
.rb-btn--sm{padding:8px 14px;font-size:13px}

/* breadcrumb */
.rb-breadcrumb{font-family:var(--font-mono);font-size:11.5px;letter-spacing:.06em;color:var(--ink-2)}
.rb-breadcrumb ol{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.rb-breadcrumb li{display:flex;align-items:center;gap:8px}
.rb-breadcrumb li+li::before{content:"/";color:var(--line)}
.rb-breadcrumb a{text-decoration:underline;text-underline-offset:3px;text-decoration-color:var(--line)}
.rb-breadcrumb a:hover{color:var(--red-deep)}
.rb-breadcrumb [aria-current="page"]{color:var(--ink);font-weight:700}

/* media */
.rb-media{
  position:relative;display:block;overflow:hidden;
  background:var(--ink-2);border:1px solid var(--line);
  aspect-ratio:16/10;
}
.rb-media--wide{aspect-ratio:21/9}
.rb-media--square{aspect-ratio:1/1}
.rb-media--tall{aspect-ratio:3/4}
.rb-media img,.rb-media picture,.rb-media picture img{width:100%;height:100%;object-fit:cover;display:block}
.rb-media__cap{
  position:absolute;left:0;bottom:0;
  padding:4px 10px;background:var(--ink);color:var(--paper);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;
}

/* reveal */
[data-js="on"] [data-reveal]{
  opacity:0;transform:translateY(16px);
  transition:opacity .55s var(--ease),transform .55s var(--ease);
}
[data-js="on"] [data-reveal].is-in{opacity:1;transform:none}

/* footer */
.rb-footer{
  position:relative;
  background:var(--ink);color:var(--paper-soft);
  margin-top:clamp(24px,4vw,64px);
}
.rb-footer::before{
  content:"";display:block;height:6px;
  background:linear-gradient(90deg,var(--red) 0 46%,var(--blue) 46% 100%);
}
.rb-footer__grid{
  width:100%;max-width:1240px;margin-inline:auto;
  padding:clamp(32px,5vw,64px) clamp(18px,4vw,56px);
  display:grid;grid-template-columns:1.1fr .8fr 1.5fr;
  gap:clamp(24px,4vw,56px);
}
.rb-footer__brand{display:flex;flex-direction:column;gap:12px}
.rb-footer__mark{
  width:34px;height:34px;
  background:linear-gradient(105deg,var(--red) 0 44%,var(--paper) 44% 56%,var(--blue) 56% 100%);
  transform:skewX(-4deg);
}
.rb-footer__name{
  color:var(--paper);font-size:17px;font-weight:800;letter-spacing:.06em;
}
.rb-footer__note{font-size:13.5px;line-height:1.7;color:var(--paper-faint);max-width:26em}
.rb-footer__title{
  display:flex;align-items:center;gap:8px;
  font-size:12.5px;font-weight:700;letter-spacing:.12em;color:var(--paper);
  padding-bottom:12px;margin-bottom:14px;
  border-bottom:1px solid rgba(236,237,232,.16);
}
.rb-footer__title .rb-mono{color:var(--gold);font-size:11px}
.rb-footer__list{display:grid;gap:2px}
.rb-footer__list a{
  display:block;padding:5px 0;font-size:14px;color:var(--paper-soft);
  transition:color .18s var(--ease),padding-left .18s var(--ease);
}
.rb-footer__list a:hover{color:var(--cyan);padding-left:6px}
.rb-footer__contact{display:flex;flex-direction:column}
.rb-footer__row{
  display:flex;align-items:baseline;gap:10px;flex-wrap:wrap;
  padding:7px 0;border-bottom:1px dashed rgba(236,237,232,.14);
  font-size:13.5px;
}
.rb-footer__key{
  flex:0 0 40px;font-family:var(--font-mono);font-size:11px;
  letter-spacing:.14em;color:var(--gold);
}
.rb-footer__val{color:var(--paper-soft);word-break:break-word}
.rb-footer__contact .rb-footer__note{margin-top:14px;font-size:12.5px}
.rb-copy{
  flex:0 0 auto;padding:2px 8px;
  border:1px solid rgba(236,237,232,.32);color:var(--paper-soft);
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.1em;
  transition:background-color .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease);
}
.rb-copy:hover{color:var(--ink);background:var(--cyan);border-color:var(--cyan)}
.rb-copy[data-copied]{color:var(--ink);background:var(--cyan);border-color:var(--cyan)}
.rb-footer__bar{
  width:100%;max-width:1240px;margin-inline:auto;
  display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:12px;
  padding:16px clamp(18px,4vw,56px) 28px;
  border-top:1px solid rgba(236,237,232,.14);
  font-size:12px;color:var(--paper-faint);
}
.rb-footer__legal{display:flex;flex-wrap:wrap;gap:18px;font-family:var(--font-mono);font-size:11.5px;letter-spacing:.06em}
.rb-footer__legal a{color:var(--paper-soft);text-decoration:underline;text-underline-offset:4px;text-decoration-color:rgba(236,237,232,.28)}
.rb-footer__legal a:hover{color:var(--cyan)}
.rb-footer__copy{font-family:var(--font-mono);letter-spacing:.04em}

/* responsive */
@media (max-width:1100px){
  :root{--rail-w:86px}
  .rb-brand__word{font-size:12px}
  .rb-nav__label{font-size:12px}
}
@media (max-width:900px){
  :root{--rail-w:0px;--topbar-h:48px}
  body{padding-left:0}
  .rb-progress{height:2px}
  .rb-nav-toggle{display:inline-flex}
  .rb-rail{
    top:var(--topbar-h);bottom:0;left:0;right:auto;
    width:min(304px,86vw);height:auto;
    transform:translateX(-102%);
    visibility:hidden;
    border-right:1px solid rgba(236,237,232,.2);
    box-shadow:0 24px 60px rgba(17,24,32,.4);
    transition:transform .28s var(--ease),visibility .28s var(--ease);
  }
  .rb-header[data-open] .rb-rail{transform:translateX(0);visibility:visible}
  .rb-header[data-open]::before{
    content:"";position:fixed;inset:var(--topbar-h) 0 0 0;z-index:104;
    background:rgba(17,24,32,.55);
  }
  .rb-brand{flex-direction:row;justify-content:flex-start;gap:12px;padding:16px 18px}
  .rb-brand__word{flex-direction:row;gap:0;font-size:14px;letter-spacing:.12em}
  .rb-nav__link{
    flex-direction:row;justify-content:flex-start;align-items:baseline;gap:14px;
    min-height:0;padding:14px 18px;border-left:3px solid transparent;
  }
  .rb-nav__num{font-size:11px}
  .rb-nav__label{font-size:14.5px}
  .rb-rail__foot{flex-direction:row;justify-content:flex-start;gap:14px;padding:16px 18px}
  .rb-grid--2,.rb-grid--3,.rb-grid--split{grid-template-columns:1fr}
  .rb-grid--4{grid-template-columns:repeat(2,minmax(0,1fr))}
  .rb-footer__grid{grid-template-columns:1fr 1fr}
  .rb-footer__contact{grid-column:1/-1}
  .rb-topbar__item--ver{display:none}
}
@media (max-width:640px){
  .rb-grid--4{grid-template-columns:1fr}
  .rb-topbar__name{font-size:11.5px;letter-spacing:.04em}
  .rb-topbar__status{gap:10px}
  .rb-topbar__item--clock .rb-live{display:none}
  .rb-footer__grid{grid-template-columns:1fr;gap:28px}
  .rb-footer__bar{flex-direction:column;align-items:flex-start;gap:10px}
  .rb-panel{padding:20px}
}
@media (max-width:420px){
  .rb-topbar__status{display:none}
  .rb-nav-toggle{margin-left:auto}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .rb-live{animation:none}
  [data-js="on"] [data-reveal]{opacity:1;transform:none}
  .rb-panel:hover,.rb-btn:hover{transform:none}
}