:root{
  --ry-primary:#1B6C8C;
  --ry-deep:#123C4A;
  --ry-deeper:#0C2C36;
  --ry-gold:#D9A441;
  --ry-gold-soft:#F2D28B;
  --ry-vermil:#B4432F;
  --ry-rock:#5C666B;
  --ry-cream:#F4EFE3;
  --ry-snow:#FCFAF5;
  --ry-ink:#2B2523;
  --ry-mist:#DCE8E8;
  --rail-w:122px;
  --read-progress:0;
  --font-display:"Songti SC","Noto Serif SC","Source Han Serif SC",Georgia,"SimSun",serif;
  --font-sans:"PingFang SC","Hiragino Sans GB","Noto Sans SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-mono:ui-monospace,"SFMono-Regular","JetBrains Mono","IBM Plex Mono",Menlo,Consolas,monospace;
  --shadow-panel:0 20px 44px -30px rgba(18,60,74,.6);
  --line-soft:rgba(27,108,140,.22);
}

*,*::before,*::after{box-sizing:border-box;}

html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}

body{
  margin:0;
  min-height:100vh;
  padding-left:0;
  background-color:var(--ry-cream);
  background-image:repeating-linear-gradient(90deg,rgba(27,108,140,.055) 0 1px,transparent 1px 120px);
  color:var(--ry-ink);
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.8;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
}

h1,h2,h3,h4,p,ul,ol,figure,blockquote{margin:0;}
ul,ol{padding:0;list-style:none;}
img,svg{display:block;max-width:100%;}
a{color:inherit;}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer;}

:focus-visible{outline:3px solid var(--ry-gold);outline-offset:3px;border-radius:2px;}

/* ---------- skip link ---------- */
.skip-link{
  position:fixed;
  top:8px;
  left:8px;
  z-index:200;
  padding:10px 16px;
  background:var(--ry-gold);
  color:var(--ry-deep);
  font-size:13px;
  font-weight:700;
  letter-spacing:.12em;
  text-decoration:none;
  transform:translateY(-180%);
  transition:transform .2s ease;
}
.skip-link:focus{transform:translateY(0);}

/* ---------- header : side rail ---------- */
.site-frame{
  position:fixed;
  top:0;
  left:0;
  bottom:0;
  width:var(--rail-w);
  z-index:60;
  display:flex;
  flex-direction:column;
  overflow:hidden;
  color:var(--ry-snow);
  background-color:var(--ry-deep);
  background-image:
    linear-gradient(180deg,rgba(217,164,65,.16),rgba(217,164,65,0) 200px),
    repeating-linear-gradient(180deg,rgba(252,250,245,.05) 0 1px,transparent 1px 96px);
  border-right:1px solid rgba(217,164,65,.42);
}
.site-frame::before{
  content:"";
  position:fixed;
  top:0;
  left:0;
  width:3px;
  height:100vh;
  background:linear-gradient(180deg,var(--ry-gold),var(--ry-vermil));
  transform:scaleY(var(--read-progress,0));
  transform-origin:top center;
  pointer-events:none;
}

.rail-top{
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:14px;
  padding:20px 10px 16px;
  border-bottom:1px solid rgba(252,250,245,.14);
}

.rail-brand{
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:8px;
  text-align:center;
  text-decoration:none;
  color:inherit;
}
.rail-mark{
  display:grid;
  place-items:center;
  width:44px;
  height:44px;
  font-family:var(--font-display);
  font-size:22px;
  font-weight:700;
  line-height:1;
  color:var(--ry-deep);
  background:var(--ry-gold);
  clip-path:polygon(0 0,100% 0,100% 70%,70% 100%,0 100%);
}
.rail-brand-name{
  font-size:12.5px;
  font-weight:700;
  line-height:1.5;
  letter-spacing:.04em;
  color:var(--ry-snow);
}
.rail-brand-tag{
  font-size:9.5px;
  line-height:1.6;
  letter-spacing:.1em;
  color:rgba(242,210,139,.82);
}

.nav-toggle{display:none;}

.rail-panel{
  flex:1;
  min-height:0;
  display:flex;
  flex-direction:column;
}

.rail-nav{
  flex:1;
  min-height:0;
  overflow-y:auto;
  padding:14px 10px 8px;
}
.rail-nav-title{
  margin-bottom:10px;
  padding-left:4px;
  font-family:var(--font-mono);
  font-size:9.5px;
  letter-spacing:.24em;
  color:rgba(242,210,139,.7);
}
.rail-nav-list li + li{margin-top:2px;}

.rail-link{
  position:relative;
  display:flex;
  flex-direction:column;
  gap:1px;
  padding:9px 6px 9px 10px;
  text-decoration:none;
  color:rgba(252,250,245,.72);
  transition:color .18s ease,background-color .18s ease;
}
.rail-link:hover{color:var(--ry-snow);background-color:rgba(217,164,65,.16);}
.rail-link[aria-current="page"]{
  color:var(--ry-gold-soft);
  background-image:linear-gradient(90deg,rgba(217,164,65,.28),rgba(217,164,65,0));
}
.rail-link[aria-current="page"]::before{
  content:"";
  position:absolute;
  left:0;
  top:7px;
  bottom:7px;
  width:3px;
  background:var(--ry-gold);
}
.rail-index{
  font-family:var(--font-mono);
  font-size:9.5px;
  letter-spacing:.16em;
  color:var(--ry-gold);
}
.rail-label{
  font-size:12.5px;
  font-weight:700;
  line-height:1.4;
  letter-spacing:.08em;
}

.rail-foot{
  padding:14px 10px 16px;
  border-top:1px solid rgba(252,250,245,.14);
}
.rail-cta{
  display:block;
  padding:11px 4px;
  text-align:center;
  font-size:12px;
  font-weight:700;
  letter-spacing:.14em;
  text-decoration:none;
  color:var(--ry-gold-soft);
  border:1px solid rgba(217,164,65,.75);
  background:rgba(217,164,65,.08);
  clip-path:polygon(0 0,100% 0,100% calc(100% - 9px),calc(100% - 9px) 100%,0 100%);
  transition:background-color .2s ease,color .2s ease;
}
.rail-cta:hover{background-color:var(--ry-gold);color:var(--ry-deep);}
.rail-note{
  margin-top:10px;
  font-size:9.5px;
  line-height:1.6;
  letter-spacing:.06em;
  color:rgba(252,250,245,.44);
}

/* ---------- footer : version band ---------- */
.site-foot{
  position:relative;
  margin-top:88px;
  background-color:var(--ry-deep);
  background-image:linear-gradient(180deg,rgba(217,164,65,.1),rgba(217,164,65,0) 160px);
  color:rgba(252,250,245,.86);
  border-top:3px solid var(--ry-gold);
}
.foot-grid{
  display:grid;
  grid-template-columns:1fr;
  gap:34px;
  width:100%;
  max-width:1120px;
  margin:0 auto;
  padding:48px 24px 34px;
}
.foot-block{position:relative;min-width:0;}

.foot-mark{
  font-family:var(--font-display);
  font-size:1.45rem;
  font-weight:700;
  letter-spacing:.12em;
  color:var(--ry-snow);
}
.foot-summary{
  margin-top:12px;
  max-width:34ch;
  font-size:14px;
  line-height:1.85;
  color:rgba(252,250,245,.68);
}
.foot-region{
  display:inline-block;
  margin-top:14px;
  padding:3px 10px;
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.16em;
  color:var(--ry-gold-soft);
  border:1px solid rgba(217,164,65,.5);
}
.foot-links{
  display:flex;
  flex-wrap:wrap;
  gap:8px 18px;
  margin-top:18px;
}
.foot-links a{
  padding-bottom:2px;
  font-size:12.5px;
  letter-spacing:.12em;
  text-decoration:none;
  color:rgba(252,250,245,.8);
  border-bottom:1px solid rgba(217,164,65,.42);
  transition:color .2s ease,border-color .2s ease;
}
.foot-links a:hover{color:var(--ry-gold-soft);border-color:var(--ry-gold-soft);}

.foot-kicker{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.2em;
  color:var(--ry-gold);
}
.foot-version-title{
  margin-top:10px;
  font-size:1.15rem;
  font-weight:700;
  letter-spacing:.08em;
  color:var(--ry-snow);
}
.foot-version-desc{
  margin-top:8px;
  max-width:32ch;
  font-size:13.5px;
  line-height:1.85;
  color:rgba(252,250,245,.66);
}
.foot-version-link{
  display:inline-block;
  margin-top:16px;
  padding-bottom:3px;
  font-size:12.5px;
  font-weight:700;
  letter-spacing:.14em;
  text-decoration:none;
  color:var(--ry-gold-soft);
  border-bottom:1px solid var(--ry-gold);
  transition:color .2s ease,border-color .2s ease;
}
.foot-version-link:hover{color:var(--ry-snow);border-color:var(--ry-snow);}

.foot-contact-list li{
  display:flex;
  flex-direction:column;
  gap:2px;
  padding:10px 0;
  font-size:13.5px;
  border-top:1px solid rgba(252,250,245,.14);
}
.foot-contact-list li:first-child{border-top:0;padding-top:12px;}
.foot-key{
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.18em;
  color:rgba(242,210,139,.85);
}
.foot-value{
  color:rgba(252,250,245,.9);
  word-break:break-word;
}

.foot-base{
  display:flex;
  flex-wrap:wrap;
  gap:10px 26px;
  width:100%;
  max-width:1120px;
  margin:0 auto;
  padding:16px 24px 30px;
  border-top:1px solid rgba(252,250,245,.14);
}
.foot-legal{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  color:rgba(252,250,245,.55);
}

/* ---------- generic layout ---------- */
.ry-main{display:block;}
.ry-shell{
  width:100%;
  max-width:1120px;
  margin:0 auto;
  padding:0 24px;
}
.ry-section{padding:56px 0;}
.ry-section:first-child{padding-top:32px;}

.ry-eyebrow{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--ry-primary);
}
.ry-display{
  font-family:var(--font-display);
  font-size:clamp(2.1rem,5.4vw,3.9rem);
  font-weight:700;
  line-height:1.08;
  letter-spacing:.04em;
  color:var(--ry-ink);
}
.ry-title{
  font-family:var(--font-sans);
  font-size:clamp(1.3rem,2.4vw,1.85rem);
  font-weight:700;
  line-height:1.35;
  letter-spacing:.1em;
  color:var(--ry-deep);
}
.ry-lede{
  max-width:56ch;
  font-size:clamp(1rem,1.4vw,1.1rem);
  line-height:1.85;
  color:#3b4348;
}
.ry-text p{margin-bottom:1em;}
.ry-text p:last-child{margin-bottom:0;}
.ry-meta{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--ry-rock);
}
.ry-num{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  letter-spacing:.06em;
  color:var(--ry-primary);
}
.ry-num--gold{color:var(--ry-gold-soft);}

/* ---------- buttons ---------- */
.ry-btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.6em;
  padding:13px 26px;
  font-size:13px;
  font-weight:700;
  letter-spacing:.16em;
  text-decoration:none;
  color:var(--ry-deep);
  background:var(--ry-snow);
  border:1px solid var(--ry-primary);
  clip-path:polygon(0 0,100% 0,100% calc(100% - 10px),calc(100% - 10px) 100%,0 100%);
  transition:background-color .2s ease,color .2s ease,border-color .2s ease;
}
.ry-btn:hover{background:var(--ry-primary);color:var(--ry-snow);}
.ry-btn--gold{
  border-color:var(--ry-gold);
  color:var(--ry-gold-soft);
  background:transparent;
}
.ry-btn--gold:hover{background:var(--ry-gold);color:var(--ry-deep);}
.ry-btn--solid{
  border-color:var(--ry-deep);
  background:var(--ry-deep);
  color:var(--ry-snow);
}
.ry-btn--solid:hover{background:var(--ry-primary);border-color:var(--ry-primary);}

/* ---------- breadcrumb ---------- */
.ry-breadcrumb{
  padding:20px 0 0;
  font-size:12px;
  letter-spacing:.1em;
  color:var(--ry-rock);
}
.ry-breadcrumb ol{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:.4em;
}
.ry-breadcrumb li{display:inline-flex;align-items:center;}
.ry-breadcrumb li::after{content:"／";margin-left:.45em;color:rgba(92,102,107,.5);}
.ry-breadcrumb li:last-child::after{content:"";margin:0;}
.ry-breadcrumb a{color:var(--ry-primary);text-decoration:none;}
.ry-breadcrumb a:hover{text-decoration:underline;}
.ry-breadcrumb [aria-current="page"]{color:var(--ry-ink);font-weight:700;}

/* ---------- panels, bands, tags ---------- */
.ry-panel{
  position:relative;
  padding:clamp(20px,3vw,32px);
  background:var(--ry-snow);
  border:1px solid rgba(27,108,140,.18);
  box-shadow:var(--shadow-panel);
}
.ry-panel::after{
  content:"";
  position:absolute;
  right:0;
  bottom:0;
  width:22px;
  height:22px;
  background:linear-gradient(135deg,rgba(217,164,65,0) 50%,rgba(217,164,65,.55) 50%);
  pointer-events:none;
}

.ry-band{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:12px 18px;
  padding:16px 22px;
  background:var(--ry-deep);
  color:var(--ry-snow);
  border-left:4px solid var(--ry-gold);
  clip-path:polygon(0 0,100% 0,100% calc(100% - 14px),calc(100% - 14px) 100%,0 100%);
}
.ry-band--alert{border-left-color:var(--ry-vermil);}

.ry-tag{
  display:inline-flex;
  align-items:center;
  gap:.35em;
  padding:3px 10px;
  font-size:11px;
  font-weight:700;
  letter-spacing:.14em;
  color:#3a2c12;
  background:var(--ry-gold-soft);
  border-radius:1px;
}
.ry-tag--alert{background:var(--ry-vermil);color:var(--ry-snow);}
.ry-tag--line{
  background:transparent;
  color:var(--ry-primary);
  border:1px solid rgba(27,108,140,.4);
}

.ry-rule{
  position:relative;
  height:1px;
  margin:40px 0;
  background:var(--line-soft);
}
.ry-rule::before{
  content:"";
  position:absolute;
  left:0;
  top:-3px;
  width:7px;
  height:7px;
  background:var(--ry-gold);
  transform:rotate(45deg);
}

.ry-coord{
  display:inline-block;
  padding-top:6px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  color:var(--ry-rock);
  border-top:1px solid rgba(27,108,140,.38);
}

/* ---------- grids & list ---------- */
.ry-grid{display:grid;gap:24px;grid-template-columns:1fr;}
.ry-grid--2{grid-template-columns:1fr;}
.ry-grid--3{grid-template-columns:1fr;}
.ry-split{display:grid;gap:32px;grid-template-columns:1fr;}

.ry-list li{
  position:relative;
  margin-bottom:.55em;
  padding-left:18px;
  line-height:1.8;
}
.ry-list li:last-child{margin-bottom:0;}
.ry-list li::before{
  content:"";
  position:absolute;
  left:0;
  top:.72em;
  width:6px;
  height:6px;
  background:var(--ry-primary);
  transform:rotate(45deg);
}

/* ---------- figure ---------- */
.ry-figure{
  position:relative;
  margin:0;
  overflow:hidden;
  background-color:var(--ry-mist);
  background-image:
    linear-gradient(140deg,rgba(27,108,140,.18),rgba(217,164,65,.18)),
    repeating-linear-gradient(90deg,rgba(18,60,74,.14) 0 1px,transparent 1px 28px),
    repeating-linear-gradient(0deg,rgba(18,60,74,.12) 0 1px,transparent 1px 28px);
  border:1px solid rgba(27,108,140,.18);
  clip-path:polygon(0 0,100% 0,100% calc(100% - 18px),calc(100% - 18px) 100%,0 100%);
}
.ry-figure img,
.ry-figure svg{width:100%;height:100%;object-fit:cover;}
.ry-figure--16x9{aspect-ratio:16 / 9;}
.ry-figure--4x3{aspect-ratio:4 / 3;}
.ry-figure--1x1{aspect-ratio:1 / 1;}
.ry-figure--wide{aspect-ratio:21 / 9;}
.ry-figure__caption{
  margin-top:10px;
  font-size:12px;
  letter-spacing:.08em;
  color:var(--ry-rock);
}

/* ---------- reveal & utilities ---------- */
.has-js [data-reveal]{
  opacity:0;
  transform:translateY(18px);
  transition:opacity .62s cubic-bezier(.22,.68,.32,1),transform .62s cubic-bezier(.22,.68,.32,1);
  transition-delay:var(--reveal-delay,0ms);
}
.has-js [data-reveal].is-visible{opacity:1;transform:none;}

.ry-to-top{
  position:fixed;
  right:18px;
  bottom:18px;
  z-index:70;
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:10px 14px;
  font-size:11px;
  font-weight:700;
  letter-spacing:.14em;
  color:var(--ry-snow);
  background:var(--ry-deep);
  border:1px solid rgba(217,164,65,.6);
  clip-path:polygon(0 0,100% 0,100% calc(100% - 9px),calc(100% - 9px) 100%,0 100%);
  opacity:0;
  visibility:hidden;
  transform:translateY(10px);
  transition:opacity .2s ease,transform .2s ease,visibility .2s ease,background-color .2s ease;
}
.ry-to-top[data-visible="true"]{opacity:1;visibility:visible;transform:none;}
.ry-to-top:hover{background:var(--ry-primary);}

/* ---------- responsive ---------- */
@media (min-width:768px){
  body{padding-left:var(--rail-w);}
  .foot-grid{grid-template-columns:1.25fr 1fr;}
  .ry-grid--2{grid-template-columns:repeat(2,minmax(0,1fr));}
  .ry-grid--3{grid-template-columns:repeat(2,minmax(0,1fr));}
  .ry-section{padding:72px 0;}
}

@media (min-width:768px) and (max-width:1099px){
  :root{--rail-w:106px;}
  .rail-brand-name{font-size:11.5px;}
  .rail-label{font-size:11.5px;letter-spacing:.05em;}
  .rail-link{padding-left:8px;}
}

@media (min-width:900px){
  .ry-split{grid-template-columns:minmax(0,1.15fr) minmax(0,.85fr);align-items:start;gap:44px;}
}

@media (min-width:1100px){
  .foot-grid{grid-template-columns:1.3fr 1fr 1fr;}
  .ry-grid--3{grid-template-columns:repeat(3,minmax(0,1fr));}
}

@media (max-width:767px){
  body{padding-top:62px;background-image:none;}

  .site-frame{
    right:0;
    bottom:auto;
    width:auto;
    height:62px;
    flex-direction:row;
    align-items:center;
    padding:0 16px;
    overflow:visible;
    border-right:0;
    border-bottom:1px solid rgba(217,164,65,.42);
  }
  .site-frame::before{
    top:auto;
    bottom:0;
    left:0;
    width:100%;
    height:3px;
    transform:scaleX(var(--read-progress,0));
    transform-origin:left center;
  }
  .rail-top{
    flex-direction:row;
    align-items:center;
    justify-content:space-between;
    width:100%;
    gap:12px;
    padding:0;
    border-bottom:0;
  }
  .rail-brand{flex-direction:row;gap:10px;text-align:left;}
  .rail-mark{width:34px;height:34px;font-size:17px;}
  .rail-brand-name{font-size:13px;letter-spacing:.06em;}
  .rail-brand-tag{display:none;}

  .nav-toggle{
    display:inline-flex;
    align-items:center;
    gap:9px;
    padding:9px 12px;
    color:var(--ry-gold-soft);
    border:1px solid rgba(217,164,65,.6);
    transition:color .2s ease,background-color .2s ease;
  }
  .nav-toggle:hover{color:var(--ry-snow);background:rgba(217,164,65,.16);}
  .nav-toggle-bars{
    position:relative;
    display:block;
    width:16px;
    height:2px;
    background:currentColor;
    transition:background-color .2s ease;
  }
  .nav-toggle-bars::before,
  .nav-toggle-bars::after{
    content:"";
    position:absolute;
    left:0;
    width:16px;
    height:2px;
    background:currentColor;
    transition:transform .2s ease;
  }
  .nav-toggle-bars::before{top:-5px;}
  .nav-toggle-bars::after{top:5px;}
  .site-frame[data-open="true"] .nav-toggle-bars{background:transparent;}
  .site-frame[data-open="true"] .nav-toggle-bars::before{transform:translateY(5px) rotate(45deg);}
  .site-frame[data-open="true"] .nav-toggle-bars::after{transform:translateY(-5px) rotate(-45deg);}
  .nav-toggle-text{font-size:12px;font-weight:700;letter-spacing:.14em;}

  .rail-panel{
    position:fixed;
    top:62px;
    left:0;
    right:0;
    max-height:calc(100vh - 62px);
    overflow-y:auto;
    background-color:var(--ry-deep);
    background-image:repeating-linear-gradient(180deg,rgba(252,250,245,.05) 0 1px,transparent 1px 72px);
    border-bottom:2px solid var(--ry-gold);
    visibility:hidden;
    opacity:0;
    transform:translateY(-10px);
    transition:opacity .22s ease,transform .22s ease,visibility .22s ease;
  }
  .site-frame[data-open="true"] .rail-panel{
    visibility:visible;
    opacity:1;
    transform:none;
  }

  .rail-nav{padding:14px 16px 6px;overflow:visible;}
  .rail-nav-title{padding-left:0;margin-bottom:12px;}
  .rail-nav-list{display:grid;grid-template-columns:1fr 1fr;gap:6px;}
  .rail-nav-list li + li{margin-top:0;}
  .rail-link{
    flex-direction:row;
    align-items:baseline;
    gap:8px;
    padding:11px 9px;
    border:1px solid rgba(252,250,245,.1);
  }
  .rail-index{font-size:10px;}
  .rail-label{font-size:13.5px;}
  .rail-link[aria-current="page"]::before{top:6px;bottom:6px;}

  .rail-foot{padding:14px 16px 20px;}
  .rail-note{display:none;}
  .rail-cta{padding:12px;}

  .ry-to-top{right:12px;bottom:12px;padding:9px 12px;}
}

@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    transition-delay:0ms !important;
  }
  .has-js [data-reveal]{opacity:1;transform:none;}
  .skip-link{transition:none;}
}