/* ============================================================
   raybet 版本中心 · /assets/site.css
   共享外壳（头部 / 页脚）与基础组件
   分层顺序：背景层 → 色块层 → 纸层 → 内容层
   ============================================================ */

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

:root{
  --rb-red:#E01B24;
  --rb-red-deep:#A31018;
  --rb-black:#0B0D10;
  --rb-ink:#171A20;
  --rb-gold:#F2C14E;
  --rb-bronze:#C9922F;
  --rb-gray:#8A919E;
  --rb-cream:#F6F2EA;
  --rb-paper:#FFFDF9;
  --rb-paper-2:#E7E1D6;

  --rb-font-sans:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --rb-font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,"Courier New",monospace;

  --rb-container:1180px;
  --rb-header-h:76px;
  --rb-gap:24px;
  --rb-line:rgba(242,193,78,.24);
  --rb-line-ink:rgba(11,13,16,.14);
  --rb-ease:cubic-bezier(.22,.61,.36,1);
}

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

body{
  margin:0;
  padding-top:var(--rb-header-h);
  background:var(--rb-cream);
  color:var(--rb-ink);
  font-family:var(--rb-font-sans);
  font-size:17px;
  font-weight:400;
  line-height:1.85;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

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

:focus-visible{outline:2px solid var(--rb-gold);outline-offset:3px;border-radius:2px}
::selection{background:var(--rb-red);color:var(--rb-paper)}

#main-content{display:block}

/* ---------------- 跳转链接 ---------------- */
.rb-skip{
  position:fixed;
  top:10px;
  left:10px;
  z-index:300;
  transform:translateY(-220%);
  background:var(--rb-gold);
  color:var(--rb-black);
  padding:10px 18px;
  font-size:14px;
  font-weight:700;
  border-radius:2px;
  transition:transform .18s var(--rb-ease);
}
.rb-skip:focus,
.rb-skip:focus-visible{transform:translateY(0)}

/* ---------------- 容器与区块 ---------------- */
.rb-container{
  width:100%;
  max-width:var(--rb-container);
  margin-inline:auto;
  padding-inline:24px;
}

.rb-section{padding-block:clamp(56px,7vw,104px)}
.rb-section--tight{padding-block:clamp(34px,4vw,60px)}
.rb-section--cream{background:var(--rb-cream)}
.rb-section--paper{background:var(--rb-paper)}
.rb-section--ink{background:var(--rb-ink);color:var(--rb-paper)}
.rb-section--dark{background:var(--rb-black);color:var(--rb-paper)}

.rb-hero{
  position:relative;
  margin-top:calc(var(--rb-header-h) * -1);
  padding-block:calc(var(--rb-header-h) + 56px) clamp(56px,8vw,104px);
  background:
    radial-gradient(circle at 82% 12%,rgba(224,27,36,.28),transparent 46%),
    linear-gradient(160deg,#0B0D10 0%,#171A20 58%,#0B0D10 100%);
  color:var(--rb-paper);
  overflow:hidden;
}
.rb-hero::before{
  content:"";
  position:absolute;
  inset:0;
  background-image:
    linear-gradient(rgba(242,193,78,.07) 1px,transparent 1px),
    linear-gradient(90deg,rgba(242,193,78,.07) 1px,transparent 1px);
  background-size:64px 64px;
  pointer-events:none;
}

/* ---------------- 索引与文本元素 ---------------- */
.rb-eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-family:var(--rb-font-mono);
  font-size:12px;
  font-weight:500;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--rb-gold);
}
.rb-eyebrow::before{
  content:"";
  width:10px;
  height:10px;
  background:var(--rb-red);
  flex:0 0 auto;
}

.rb-section-title{
  font-size:clamp(26px,3.6vw,40px);
  font-weight:900;
  line-height:1.18;
  letter-spacing:-.02em;
}

.rb-section-note{
  max-width:58ch;
  color:var(--rb-gray);
  font-size:15.5px;
  line-height:1.8;
}
.rb-section--dark .rb-section-note,
.rb-section--ink .rb-section-note{color:rgba(255,253,249,.62)}

.rb-meta{
  font-family:var(--rb-font-mono);
  font-size:12.5px;
  letter-spacing:.06em;
  color:var(--rb-gray);
}

.rb-prose{
  max-width:38em;
  font-size:17px;
  line-height:1.85;
}
.rb-prose p + p{margin-top:1.1em}
.rb-prose a{color:var(--rb-red-deep);border-bottom:1px solid rgba(224,27,36,.4)}
.rb-prose a:hover{color:var(--rb-red);border-bottom-color:var(--rb-red)}

.rb-divider{
  height:1px;
  border:0;
  margin:0;
  background:var(--rb-line);
}

/* ---------------- 栅格 ---------------- */
.rb-grid{
  display:grid;
  grid-template-columns:repeat(12,minmax(0,1fr));
  gap:var(--rb-gap);
}
.rb-span-4{grid-column:span 4}
.rb-span-5{grid-column:span 5}
.rb-span-6{grid-column:span 6}
.rb-span-7{grid-column:span 7}
.rb-span-8{grid-column:span 8}
.rb-span-12{grid-column:span 12}

@media (max-width:900px){
  .rb-span-4,.rb-span-5,.rb-span-6,.rb-span-7,.rb-span-8{grid-column:span 12}
}

/* ---------------- 按钮 ---------------- */
.rb-btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:13px 24px;
  border:1px solid transparent;
  border-radius:2px;
  font-size:15px;
  font-weight:700;
  line-height:1.2;
  letter-spacing:.02em;
  cursor:pointer;
  text-align:center;
  transition:background-color .18s var(--rb-ease),color .18s var(--rb-ease),border-color .18s var(--rb-ease),transform .18s var(--rb-ease);
}
.rb-btn:active{transform:translateY(1px)}
.rb-btn--red{background:var(--rb-red);color:#fff;box-shadow:0 12px 26px -16px rgba(224,27,36,.95)}
.rb-btn--red:hover{background:var(--rb-red-deep)}
.rb-btn--gold{background:var(--rb-gold);color:var(--rb-black)}
.rb-btn--gold:hover{background:var(--rb-bronze)}
.rb-btn--ghost{background:transparent;color:var(--rb-gold);border-color:var(--rb-line)}
.rb-btn--ghost:hover{border-color:var(--rb-gold);background:rgba(242,193,78,.08)}
.rb-btn--sm{padding:9px 16px;font-size:13.5px}

/* ---------------- 纸层卡片 ---------------- */
.rb-card{
  position:relative;
  isolation:isolate;
  background:var(--rb-paper);
  border:1px solid var(--rb-line-ink);
  padding:26px;
  transition:transform .2s var(--rb-ease),border-color .2s var(--rb-ease);
}
.rb-card::after{
  content:"";
  position:absolute;
  inset:8px -8px -8px 8px;
  border:1px solid var(--rb-line);
  z-index:-1;
  pointer-events:none;
  transition:transform .2s var(--rb-ease);
}
.rb-card:hover{transform:translateY(-2px);border-color:var(--rb-bronze)}
.rb-card:hover::after{transform:translate(2px,2px)}

/* ---------------- 图片容器 ---------------- */
.rb-media{
  position:relative;
  display:block;
  width:100%;
  overflow:hidden;
  background:linear-gradient(150deg,#171A20,#0B0D10);
  border:1px solid var(--rb-line);
}
.rb-media img{width:100%;height:100%;object-fit:cover}
.rb-media--16x9{aspect-ratio:16/9}
.rb-media--4x3{aspect-ratio:4/3}
.rb-media--1x1{aspect-ratio:1/1}
.rb-media--wide{aspect-ratio:21/9}
.rb-media--grid::before{
  content:"";
  position:absolute;
  inset:0;
  background-image:
    linear-gradient(rgba(242,193,78,.09) 1px,transparent 1px),
    linear-gradient(90deg,rgba(242,193,78,.09) 1px,transparent 1px);
  background-size:40px 40px;
  pointer-events:none;
}
.rb-media__caption{
  display:block;
  margin-top:10px;
  font-family:var(--rb-font-mono);
  font-size:12.5px;
  letter-spacing:.04em;
  color:var(--rb-gray);
}

/* ---------------- 标签 ---------------- */
.rb-tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 10px;
  border:1px solid var(--rb-line);
  border-radius:2px;
  background:rgba(242,193,78,.06);
  font-family:var(--rb-font-mono);
  font-size:11.5px;
  font-weight:600;
  letter-spacing:.08em;
  color:var(--rb-gold);
}
.rb-tag--gold{background:var(--rb-gold);color:var(--rb-black);border-color:var(--rb-gold)}
.rb-tag--red{background:var(--rb-red);color:#fff;border-color:var(--rb-red)}

/* ---------------- 面包屑 ---------------- */
.rb-breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font-family:var(--rb-font-mono);
  font-size:12.5px;
  letter-spacing:.04em;
  color:var(--rb-gray);
}
.rb-breadcrumb a{color:var(--rb-gray);border-bottom:1px solid transparent;transition:color .16s,border-color .16s}
.rb-breadcrumb a:hover{color:var(--rb-red);border-bottom-color:var(--rb-red)}
.rb-breadcrumb__sep{color:var(--rb-bronze)}
.rb-breadcrumb [aria-current="page"]{color:var(--rb-ink)}

/* ---------------- 标签页组件 ---------------- */
.rb-tabs{display:block}
.rb-tabs__list{
  display:flex;
  flex-wrap:wrap;
  gap:6px;
  margin-bottom:26px;
  border-bottom:1px solid var(--rb-line-ink);
}
.rb-tabs__tab{
  position:relative;
  top:1px;
  padding:11px 18px;
  border:1px solid transparent;
  border-bottom:none;
  border-radius:2px 2px 0 0;
  font-size:15px;
  font-weight:700;
  color:var(--rb-gray);
  cursor:pointer;
  transition:color .18s var(--rb-ease),background-color .18s var(--rb-ease);
}
.rb-tabs__tab:hover{color:var(--rb-ink)}
.rb-tabs__tab[aria-selected="true"]{
  color:var(--rb-paper);
  background:var(--rb-ink);
  border-color:var(--rb-ink);
}
.rb-tabs__tab[aria-selected="true"]::after{
  content:"";
  position:absolute;
  left:18px;
  right:18px;
  bottom:0;
  height:2px;
  background:var(--rb-red);
}
.rb-tabs__panels{display:block}
.rb-tabs__panel{padding-top:4px;animation:rb-fade .18s var(--rb-ease) both}
.rb-tabs__panel[hidden]{display:none}
@keyframes rb-fade{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}

/* ---------------- 滚动显现 ---------------- */
.rb-reveal{
  opacity:0;
  transform:translateY(20px);
  transition:opacity .5s var(--rb-ease),transform .5s var(--rb-ease);
}
.rb-reveal.is-visible{opacity:1;transform:none}

/* ============================================================
   头部
   ============================================================ */
.rb-header{
  position:fixed;
  top:0;
  left:0;
  right:0;
  z-index:120;
  background:transparent;
  color:var(--rb-paper);
  transition:background-color .22s var(--rb-ease),box-shadow .22s var(--rb-ease);
}
.rb-header[data-solid]{
  background:rgba(11,13,16,.97);
  box-shadow:0 1px 0 rgba(242,193,78,.2),0 22px 40px -34px #000;
}

.rb-progress{
  position:absolute;
  left:0;
  right:0;
  bottom:0;
  height:2px;
  background:rgba(255,253,249,.12);
  overflow:hidden;
}
.rb-progress__bar{
  display:block;
  width:100%;
  height:100%;
  transform:scaleX(0);
  transform-origin:left center;
  background:linear-gradient(90deg,var(--rb-red),var(--rb-gold));
}

.rb-header__inner{
  display:flex;
  align-items:center;
  gap:22px;
  min-height:var(--rb-header-h);
  padding-block:10px;
}

/* 品牌 */
.rb-brand{
  display:flex;
  align-items:center;
  gap:12px;
  order:1;
  color:var(--rb-paper);
  flex:0 0 auto;
}
.rb-brand__mark{
  display:grid;
  place-items:center;
  width:42px;
  height:42px;
  flex:0 0 auto;
  border-radius:2px;
  background:linear-gradient(155deg,var(--rb-red),var(--rb-red-deep));
  box-shadow:inset 0 0 0 1px rgba(242,193,78,.4);
  font-family:var(--rb-font-mono);
  font-size:15px;
  font-weight:700;
  letter-spacing:.02em;
  color:#fff;
}
.rb-brand__text{display:flex;flex-direction:column;line-height:1.25}
.rb-brand__name{
  font-size:17px;
  font-weight:900;
  letter-spacing:-.01em;
  color:var(--rb-paper);
}
.rb-brand__note{
  font-family:var(--rb-font-mono);
  font-size:10.5px;
  letter-spacing:.1em;
  color:var(--rb-gray);
}
.rb-brand--footer .rb-brand__name{font-size:16px}
.rb-brand--footer .rb-brand__note{font-size:10px}

/* 导航 */
.rb-nav{
  order:2;
  display:flex;
  align-items:center;
  gap:16px;
  margin-left:auto;
}
.rb-nav__list{display:flex;align-items:center;gap:2px}
.rb-nav__link{
  position:relative;
  display:block;
  padding:10px 13px;
  border-radius:2px;
  font-size:14.5px;
  font-weight:500;
  color:rgba(255,253,249,.8);
  white-space:nowrap;
  transition:color .16s var(--rb-ease),background-color .16s var(--rb-ease);
}
.rb-nav__link:hover{color:var(--rb-paper);background:rgba(255,253,249,.07)}
.rb-nav__link[aria-current="page"]{
  color:var(--rb-paper);
  font-weight:700;
  background:rgba(224,27,36,.16);
}
.rb-nav__link[aria-current="page"]::after{
  content:"";
  position:absolute;
  left:13px;
  right:13px;
  bottom:4px;
  height:2px;
  background:var(--rb-red);
}
.rb-nav__cta{display:flex;align-items:center}

/* 右侧 */
.rb-header__side{
  order:3;
  display:flex;
  align-items:center;
  gap:10px;
  flex:0 0 auto;
}
.rb-call{
  padding:6px 12px;
  border:1px solid var(--rb-line);
  border-radius:2px;
  font-family:var(--rb-font-mono);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--rb-gold);
  transition:border-color .16s var(--rb-ease),background-color .16s var(--rb-ease);
}
.rb-call:hover{border-color:var(--rb-gold);background:rgba(242,193,78,.1)}
.rb-badge-version{
  padding:6px 10px;
  border-radius:2px;
  background:var(--rb-ink);
  box-shadow:inset 0 0 0 1px rgba(242,193,78,.28);
  font-family:var(--rb-font-mono);
  font-size:11px;
  font-weight:600;
  letter-spacing:.08em;
  color:var(--rb-gold);
  white-space:nowrap;
}

/* 移动导航按钮 */
.rb-nav-toggle{
  order:4;
  display:none;
  align-items:center;
  gap:9px;
  padding:9px 12px;
  border:1px solid var(--rb-line);
  border-radius:2px;
  color:var(--rb-paper);
  cursor:pointer;
  transition:border-color .16s var(--rb-ease),background-color .16s var(--rb-ease);
}
.rb-nav-toggle:hover{border-color:var(--rb-gold);background:rgba(242,193,78,.08)}
.rb-nav-toggle__bars{display:flex;flex-direction:column;gap:4px;width:18px}
.rb-nav-toggle__bars i{
  display:block;
  height:2px;
  width:100%;
  background:var(--rb-gold);
  transition:transform .18s var(--rb-ease),opacity .18s var(--rb-ease);
}
.rb-nav-toggle__label{
  font-family:var(--rb-font-mono);
  font-size:12px;
  letter-spacing:.12em;
  color:var(--rb-gold);
}
.rb-header[data-open] .rb-nav-toggle__bars i:nth-child(1){transform:translateY(6px) rotate(45deg)}
.rb-header[data-open] .rb-nav-toggle__bars i:nth-child(2){opacity:0}
.rb-header[data-open] .rb-nav-toggle__bars i:nth-child(3){transform:translateY(-6px) rotate(-45deg)}

/* ---------------- 头部移动端 ---------------- */
@media (max-width:980px){
  .rb-nav{
    position:absolute;
    top:100%;
    left:0;
    right:0;
    display:none;
    flex-direction:column;
    align-items:stretch;
    gap:0;
    margin-left:0;
    padding:10px 24px 24px;
    background:rgba(11,13,16,.98);
    border-top:1px solid var(--rb-line);
    box-shadow:0 30px 46px -28px rgba(0,0,0,.95);
    max-height:calc(100vh - var(--rb-header-h));
    overflow-y:auto;
  }
  .rb-header[data-open] .rb-nav{display:flex}
  .rb-nav__list{flex-direction:column;align-items:stretch;gap:0}
  .rb-nav__link{
    padding:14px 4px;
    border-bottom:1px solid rgba(255,253,249,.09);
    border-radius:0;
    font-size:16px;
  }
  .rb-nav__link[aria-current="page"]{background:transparent}
  .rb-nav__link[aria-current="page"]::after{
    left:4px;
    right:auto;
    width:28px;
    bottom:8px;
  }
  .rb-nav__cta{margin-top:20px}
  .rb-nav__cta .rb-btn{width:100%}
  .rb-nav-toggle{display:inline-flex}
  .rb-header__side{margin-left:auto}
  .rb-badge-version{display:none}
}

@media (max-width:560px){
  :root{--rb-header-h:66px}
  body{font-size:16px}
  .rb-brand__note{display:none}
  .rb-brand__mark{width:38px;height:38px;font-size:14px}
  .rb-brand__name{font-size:15.5px}
  .rb-call{padding:6px 9px;font-size:11px}
  .rb-container{padding-inline:18px}
}

/* ============================================================
   页脚
   ============================================================ */
.rb-footer{
  position:relative;
  background:var(--rb-black);
  color:rgba(255,253,249,.72);
  padding:clamp(48px,6vw,78px) 0 26px;
  font-size:14.5px;
  line-height:1.75;
  overflow:hidden;
}
.rb-footer::before{
  content:"";
  position:absolute;
  top:0;
  left:0;
  right:0;
  height:2px;
  background:linear-gradient(90deg,var(--rb-red),var(--rb-gold) 55%,transparent);
}
.rb-footer::after{
  content:"";
  position:absolute;
  right:-120px;
  bottom:-120px;
  width:340px;
  height:340px;
  border-radius:50%;
  background:radial-gradient(circle,rgba(224,27,36,.22),transparent 68%);
  pointer-events:none;
}

.rb-footer__brand{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:14px 28px;
  padding-bottom:26px;
  margin-bottom:34px;
  border-bottom:1px solid rgba(255,253,249,.1);
}
.rb-footer__line{
  font-family:var(--rb-font-mono);
  font-size:12.5px;
  letter-spacing:.05em;
  color:var(--rb-gray);
}

.rb-footer__grid{
  display:grid;
  grid-template-columns:repeat(4,minmax(0,1fr));
  gap:32px 24px;
}
.rb-footer__col{min-width:0}
.rb-footer__title{
  margin-bottom:14px;
  font-family:var(--rb-font-mono);
  font-size:12px;
  font-weight:600;
  letter-spacing:.18em;
  color:var(--rb-gold);
}
.rb-footer__links li + li{margin-top:9px}
.rb-footer__links a{
  display:inline-flex;
  align-items:center;
  color:rgba(255,253,249,.68);
  transition:color .16s var(--rb-ease);
}
.rb-footer__links a::before{
  content:"";
  width:6px;
  height:6px;
  margin-right:10px;
  flex:0 0 auto;
  background:var(--rb-red);
  opacity:.55;
  transition:opacity .16s var(--rb-ease);
}
.rb-footer__links a:hover{color:var(--rb-gold)}
.rb-footer__links a:hover::before{opacity:1}

.rb-footer__contact{
  margin-top:36px;
  padding-top:24px;
  border-top:1px solid rgba(255,253,249,.1);
  font-size:13.5px;
}
.rb-footer__contact-line{
  display:flex;
  flex-wrap:wrap;
  gap:6px 10px;
  color:rgba(255,253,249,.72);
}
.rb-footer__note{
  margin-top:10px;
  max-width:70ch;
  font-size:12.5px;
  line-height:1.8;
  color:var(--rb-gray);
}

.rb-footer__bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:8px 24px;
  margin-top:26px;
  padding-top:20px;
  border-top:1px solid rgba(255,253,249,.08);
  font-family:var(--rb-font-mono);
  font-size:12px;
  letter-spacing:.05em;
  color:var(--rb-gray);
}

@media (max-width:820px){
  .rb-footer__grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:480px){
  .rb-footer__grid{grid-template-columns:1fr}
  .rb-footer__bottom{justify-content:flex-start}
}

/* ---------------- 动效降级 ---------------- */
@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-reveal{opacity:1;transform:none}
}