/* ============================================================
   1xbet信誉 · 共享站点套件  /assets/site.css
   深空靛蓝底 · 电光青结构 · 霓虹橙行动 · 三色状态语义
   ============================================================ */

/* ---------- 0. 重置 ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:20px}
body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,figcaption,blockquote{margin:0;padding:0}
ul,ol{list-style:none}
img,svg,video{display:block;max-width:100%}
button,input,select,textarea{font:inherit;color:inherit}
a{color:var(--xb-cyan)}

/* ---------- 1. 变量与排版 ---------- */
:root{
  --xb-ink:#070B18;
  --xb-ink-2:#0B1F26;
  --xb-wine:#2A0F1E;
  --xb-cyan:#2FE0D0;
  --xb-orange:#FF7A2F;
  --xb-mint:#37E5A0;
  --xb-amber:#FFB23F;
  --xb-coral:#FF5C5C;
  --xb-paper:#E8EEF5;
  --xb-muted:#93A3B8;
  --xb-line:rgba(232,238,245,.12);
  --xb-line-soft:rgba(232,238,245,.07);
  --xb-rail-w:274px;
  --xb-shell:1180px;
  --xb-r-lg:26px;
  --xb-r-md:16px;
  --xb-r-sm:10px;
  --xb-pill:999px;
  --xb-sans:"PingFang SC","Microsoft YaHei","Source Han Sans SC","Noto Sans CJK SC",system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  --xb-mono:ui-monospace,"JetBrains Mono","SFMono-Regular",Menlo,Consolas,"Liberation Mono",monospace;
  --xb-ease:cubic-bezier(.22,.7,.3,1);
  --xb-t:200ms;
}

body{
  min-height:100vh;
  font-family:var(--xb-sans);
  font-size:16px;
  line-height:1.75;
  color:var(--xb-paper);
  background-color:var(--xb-ink);
  background-image:
    radial-gradient(1100px 620px at 88% -10%, rgba(47,224,208,.10), transparent 62%),
    radial-gradient(900px 680px at 10% 106%, rgba(255,122,47,.09), transparent 60%),
    radial-gradient(760px 520px at 52% 46%, rgba(42,15,30,.55), transparent 72%);
  background-attachment:fixed;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
@media (min-width:1024px){
  body{padding-left:var(--xb-rail-w)}
}

h1,.xb-h1{font-size:clamp(28px,4.4vw,46px);font-weight:900;letter-spacing:-.02em;line-height:1.2;color:var(--xb-paper)}
h2,.xb-h2{font-size:clamp(22px,3vw,32px);font-weight:800;letter-spacing:-.015em;line-height:1.32;color:var(--xb-paper)}
h3,.xb-h3{font-size:clamp(18px,2.2vw,22px);font-weight:800;line-height:1.45;color:var(--xb-paper)}
h4,.xb-h4{font-size:16px;font-weight:800;line-height:1.5;color:var(--xb-paper)}
p{max-width:46em}

.xb-mono,.xb-num{font-family:var(--xb-mono);font-variant-numeric:tabular-nums}

.xb-sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}

:focus-visible{outline:2px solid var(--xb-cyan);outline-offset:3px;border-radius:6px}
::selection{background:rgba(47,224,208,.28);color:#fff}

/* ---------- 2. 主体容器 ---------- */
#main-content{display:block;padding:clamp(20px,3vw,42px) clamp(16px,4vw,44px) 0;scroll-margin-top:24px}
.xb-wrap{width:100%;max-width:var(--xb-shell);margin-inline:auto;padding-inline:clamp(16px,4vw,44px)}

/* ---------- 3. 跳转链接与进度条 ---------- */
.xb-header{position:relative;z-index:120}

.xb-skip{
  position:fixed;left:50%;top:-70px;transform:translateX(-50%);
  z-index:200;padding:10px 22px;border-radius:0 0 14px 14px;
  background:var(--xb-cyan);color:#04191a;font-weight:800;font-size:14px;
  text-decoration:none;transition:top var(--xb-t) var(--xb-ease);
}
.xb-skip:focus{top:0}

.xb-progress{
  position:fixed;top:0;left:0;right:0;height:2px;z-index:150;
  background:rgba(232,238,245,.06);pointer-events:none;
}
.xb-progress__bar{
  display:block;height:100%;width:0;
  background:linear-gradient(90deg,var(--xb-cyan),var(--xb-orange));
  transition:width 120ms linear;
}
@media (min-width:1024px){.xb-progress{left:var(--xb-rail-w)}}

/* ---------- 4. 侧边轨道 ---------- */
.xb-rail{
  position:fixed;top:0;left:0;bottom:0;width:var(--xb-rail-w);z-index:100;
  display:flex;flex-direction:column;gap:22px;
  padding:28px 18px 22px;overflow-y:auto;overscroll-behavior:contain;
  border-right:1px solid var(--xb-line);
  background-color:var(--xb-ink);
  background-image:
    radial-gradient(250px 170px at 16% -6%, rgba(47,224,208,.17), transparent 70%),
    radial-gradient(230px 230px at 112% 104%, rgba(255,122,47,.13), transparent 72%),
    linear-gradient(180deg, rgba(11,31,38,.97), rgba(7,11,24,.98) 58%, rgba(42,15,30,.9));
}

.xb-rail__top{display:flex;flex-direction:column;gap:14px}

.xb-wordmark{
  display:flex;align-items:center;gap:12px;padding:6px;border-radius:var(--xb-r-md);
  text-decoration:none;color:var(--xb-paper);
}
.xb-wordmark__glyph{
  position:relative;flex:none;width:34px;height:34px;border-radius:11px;
  background:conic-gradient(from 210deg,var(--xb-cyan),#0B1F26 46%,var(--xb-orange) 78%,var(--xb-cyan));
  box-shadow:0 0 0 1px rgba(232,238,245,.14), 0 10px 26px -12px rgba(47,224,208,.75);
}
.xb-wordmark__glyph::after{
  content:"";position:absolute;inset:10px;border-radius:3px;
  background:var(--xb-ink);transform:rotate(45deg);
}
.xb-wordmark__stack{display:flex;flex-direction:column;min-width:0;line-height:1.28}
.xb-wordmark__name{font-size:17px;font-weight:800;letter-spacing:-.01em}
.xb-wordmark__sub{
  font-family:var(--xb-mono);font-size:11px;letter-spacing:.12em;
  color:var(--xb-cyan);text-transform:uppercase;
}
.xb-wordmark--footer .xb-wordmark__name{font-size:18px}
.xb-wordmark--footer .xb-wordmark__sub{color:var(--xb-muted);letter-spacing:.08em}

.xb-rail__tagline{padding:0 6px;font-size:13px;line-height:1.72;color:var(--xb-muted);max-width:20em}

.xb-legend{display:flex;flex-wrap:wrap;gap:6px;padding:0 6px}
.xb-legend__item{display:inline-flex}

.xb-chip{
  display:inline-flex;align-items:center;gap:6px;white-space:nowrap;
  padding:4px 11px;border-radius:var(--xb-pill);border:1px solid currentColor;
  font-family:var(--xb-mono);font-size:11px;letter-spacing:.08em;
}
.xb-chip::before{content:"";width:6px;height:6px;border-radius:50%;background:currentColor}
.xb-chip--ok{color:var(--xb-mint);background:rgba(55,229,160,.10)}
.xb-chip--wait{color:var(--xb-amber);background:rgba(255,178,63,.10)}
.xb-chip--alert{color:var(--xb-coral);background:rgba(255,92,92,.10)}
.xb-chip--ok::before{animation:xb-pulse 2.6s var(--xb-ease) infinite}

@keyframes xb-pulse{
  0%,100%{box-shadow:0 0 0 0 rgba(55,229,160,.55)}
  50%{box-shadow:0 0 0 6px rgba(55,229,160,0)}
}

.xb-rail__nav{display:flex;flex-direction:column;min-width:0}
.xb-rail__label{
  padding:0 8px;margin-bottom:8px;
  font-family:var(--xb-mono);font-size:11px;letter-spacing:.18em;
  color:var(--xb-muted);text-transform:uppercase;
}
.xb-nav{display:flex;flex-direction:column;gap:2px}
.xb-nav__item{display:block}
.xb-nav__link{
  position:relative;display:flex;align-items:center;gap:12px;
  padding:9px 12px;border-radius:12px;text-decoration:none;
  color:var(--xb-paper);font-size:15px;font-weight:500;
  transition:background var(--xb-t) var(--xb-ease),color var(--xb-t) var(--xb-ease);
}
.xb-nav__num{
  font-family:var(--xb-mono);font-size:11px;letter-spacing:.06em;
  color:var(--xb-muted);transition:color var(--xb-t) var(--xb-ease);
}
.xb-nav__label{min-width:0}
.xb-nav__link:hover{background:rgba(47,224,208,.09);color:var(--xb-cyan)}
.xb-nav__link:hover .xb-nav__num{color:var(--xb-cyan)}
.xb-nav__link[aria-current="page"]{
  background:linear-gradient(90deg,rgba(255,122,47,.22),rgba(255,122,47,.03));
  color:#fff;
}
.xb-nav__link[aria-current="page"]::before{
  content:"";position:absolute;left:-18px;top:8px;bottom:8px;width:3px;
  border-radius:0 3px 3px 0;background:var(--xb-orange);
}
.xb-nav__link[aria-current="page"] .xb-nav__num{color:var(--xb-orange)}

.xb-rail__bottom{
  margin-top:auto;display:flex;flex-direction:column;gap:8px;
  padding-top:16px;border-top:1px solid var(--xb-line-soft);
}
.xb-rail__meta{
  padding:4px 4px 0;font-family:var(--xb-mono);font-size:11px;
  letter-spacing:.04em;color:var(--xb-muted);
}

/* ---------- 5. 按钮与行动入口 ---------- */
.xb-cta,.xb-btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  min-height:46px;padding:0 20px;border-radius:var(--xb-pill);
  border:1px solid transparent;text-decoration:none;cursor:pointer;
  font-size:15px;font-weight:700;letter-spacing:.01em;
  transition:transform var(--xb-t) var(--xb-ease),background var(--xb-t) var(--xb-ease),
    color var(--xb-t) var(--xb-ease),border-color var(--xb-t) var(--xb-ease),box-shadow var(--xb-t) var(--xb-ease);
}
.xb-btn--line,.xb-cta--ghost{
  background:rgba(47,224,208,.08);color:var(--xb-cyan);border-color:rgba(47,224,208,.42);
}
.xb-btn--line:hover,.xb-cta--ghost:hover{background:rgba(47,224,208,.17);transform:translateY(-1px)}
.xb-btn--solid{background:linear-gradient(120deg,var(--xb-cyan),#6BF3E7);color:#04191a;box-shadow:0 14px 32px -18px rgba(47,224,208,.9)}
.xb-btn--solid:hover{transform:translateY(-2px)}
.xb-btn--hot,.xb-cta--hot{background:linear-gradient(120deg,var(--xb-orange),#FFA35C);color:#1A0A02;box-shadow:0 12px 28px -15px rgba(255,122,47,.95)}
.xb-btn--hot:hover,.xb-cta--hot:hover{transform:translateY(-2px);box-shadow:0 16px 34px -14px rgba(255,122,47,1)}

/* ---------- 6. 移动导航按钮与遮罩 ---------- */
.xb-navtoggle{
  position:fixed;right:16px;bottom:16px;z-index:140;
  display:inline-flex;align-items:center;gap:10px;
  padding:13px 20px;border-radius:var(--xb-pill);
  border:1px solid rgba(47,224,208,.45);cursor:pointer;
  background:linear-gradient(120deg,rgba(11,31,38,.97),rgba(7,11,24,.97));
  color:var(--xb-paper);font-size:14px;font-weight:700;
  box-shadow:0 18px 42px -20px rgba(0,0,0,.95);
}
.xb-navtoggle__bars{position:relative;flex:none;width:18px;height:2px;border-radius:2px;background:var(--xb-cyan)}
.xb-navtoggle__bars::before,.xb-navtoggle__bars::after{
  content:"";position:absolute;left:0;width:18px;height:2px;border-radius:2px;
  background:var(--xb-cyan);
  transition:transform var(--xb-t) var(--xb-ease),top var(--xb-t) var(--xb-ease);
}
.xb-navtoggle__bars::before{top:-6px}
.xb-navtoggle__bars::after{top:6px}
.xb-navtoggle[aria-expanded="true"] .xb-navtoggle__bars{background:transparent}
.xb-navtoggle[aria-expanded="true"] .xb-navtoggle__bars::before{top:0;transform:rotate(45deg)}
.xb-navtoggle[aria-expanded="true"] .xb-navtoggle__bars::after{top:0;transform:rotate(-45deg)}
.xb-navtoggle__text{letter-spacing:.06em}

.xb-scrim{
  position:fixed;inset:0;z-index:99;
  background:rgba(4,8,18,.74);
  opacity:0;pointer-events:none;
  transition:opacity var(--xb-t) var(--xb-ease);
}
.xb-scrim[data-open]{opacity:1;pointer-events:auto}

@media (min-width:1024px){
  .xb-navtoggle{display:none}
  .xb-scrim{display:none}
}
@media (max-width:1023px){
  .xb-rail{
    width:min(86vw,340px);
    transform:translateX(-104%);
    transition:transform 220ms var(--xb-ease);
    box-shadow:24px 0 60px -30px rgba(0,0,0,.95);
  }
  .xb-rail[data-open]{transform:translateX(0)}
}

/* ---------- 7. 页脚 ---------- */
.xb-footer{
  position:relative;
  margin-top:clamp(48px,7vw,96px);
  border-top:1px solid var(--xb-line);
  background-image:linear-gradient(180deg, rgba(11,31,38,.55), rgba(42,15,30,.5) 68%, rgba(7,11,24,.92));
}
.xb-footer::before{
  content:"";position:absolute;top:-1px;left:0;width:min(320px,46%);height:2px;
  background:linear-gradient(90deg,var(--xb-cyan),transparent);
}
.xb-footer .xb-wrap{padding-bottom:clamp(24px,3vw,34px)}

.xb-footer__top{display:grid;grid-template-columns:1fr;gap:28px}
@media (min-width:768px){.xb-footer__top{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (min-width:1024px){.xb-footer__top{grid-template-columns:1.5fr repeat(4,minmax(0,1fr));gap:26px}}

.xb-footer__brand{display:flex;flex-direction:column;gap:14px;max-width:34ch}
.xb-footer__micro{font-size:13px;line-height:1.8;color:var(--xb-muted)}
.xb-footer__quick{display:flex;flex-wrap:wrap;gap:8px}
.xb-footer__chip{
  display:inline-flex;align-items:center;padding:5px 13px;border-radius:var(--xb-pill);
  border:1px solid var(--xb-line);color:var(--xb-paper);text-decoration:none;font-size:13px;
  transition:border-color var(--xb-t) var(--xb-ease),color var(--xb-t) var(--xb-ease);
}
.xb-footer__chip:hover{border-color:var(--xb-cyan);color:var(--xb-cyan)}

.xb-footer__col{min-width:0}
.xb-footer__title{
  position:relative;padding-bottom:10px;margin-bottom:12px;
  font-size:13px;font-weight:800;letter-spacing:.06em;color:var(--xb-paper);
}
.xb-footer__title::after{
  content:"";position:absolute;left:0;bottom:0;width:26px;height:2px;border-radius:2px;
  background:var(--xb-cyan);
}
.xb-footer__list{display:flex;flex-direction:column;gap:9px}
.xb-footer__link{
  color:var(--xb-muted);text-decoration:none;font-size:14px;
  transition:color var(--xb-t) var(--xb-ease),padding-left var(--xb-t) var(--xb-ease);
}
.xb-footer__link:hover{color:var(--xb-cyan);padding-left:4px}

.xb-footer__changelog{
  margin-top:clamp(30px,4vw,52px);padding-top:clamp(22px,3vw,32px);
  border-top:1px solid var(--xb-line-soft);
}
.xb-timeline{
  position:relative;display:grid;grid-auto-flow:column;
  grid-auto-columns:minmax(190px,1fr);gap:0;
  padding:22px 4px 6px;overflow-x:auto;
  scroll-snap-type:x proximity;-webkit-overflow-scrolling:touch;
}
.xb-timeline::before{
  content:"";position:absolute;left:0;right:0;top:29px;height:1px;
  background:linear-gradient(90deg,rgba(47,224,208,.55),rgba(255,122,47,.38),rgba(232,238,245,.12));
}
.xb-timeline__node{
  position:relative;display:flex;flex-direction:column;gap:4px;
  padding-right:20px;scroll-snap-align:start;
}
.xb-timeline__dot{
  width:11px;height:11px;margin-bottom:16px;border-radius:50%;
  background:var(--xb-ink);border:2px solid var(--xb-cyan);
  box-shadow:0 0 0 5px rgba(47,224,208,.10);
}
.xb-timeline__node:nth-child(even) .xb-timeline__dot{border-color:var(--xb-orange);box-shadow:0 0 0 5px rgba(255,122,47,.12)}
.xb-timeline__batch{font-family:var(--xb-mono);font-size:11px;letter-spacing:.14em;color:var(--xb-cyan)}
.xb-timeline__theme{font-size:13px;line-height:1.6;color:var(--xb-muted)}

.xb-footer__bottom{
  display:grid;gap:22px;
  margin-top:clamp(28px,4vw,44px);padding-top:clamp(22px,3vw,30px);
  border-top:1px solid var(--xb-line-soft);
}
@media (min-width:900px){
  .xb-footer__bottom{grid-template-columns:minmax(0,1.4fr) minmax(0,1fr);align-items:start}
}
.xb-contact{display:flex;flex-direction:column;gap:10px}
.xb-contact__row{display:flex;flex-wrap:wrap;align-items:baseline;gap:6px 14px;font-size:14px}
.xb-contact__key{
  min-width:74px;font-family:var(--xb-mono);font-size:11px;letter-spacing:.14em;
  color:var(--xb-cyan);text-transform:uppercase;
}
.xb-contact__value{color:var(--xb-paper)}
.xb-contact__note{margin-top:4px;max-width:44ch;font-size:13px;line-height:1.8;color:var(--xb-muted)}

.xb-legal{display:flex;flex-direction:column;gap:10px;align-items:flex-start;font-size:13px;color:var(--xb-muted)}
@media (min-width:900px){.xb-legal{align-items:flex-end;text-align:right}}
.xb-legal__line{font-family:var(--xb-mono);font-size:12px;letter-spacing:.06em}
.xb-legal__links{display:flex;flex-wrap:wrap;gap:8px 18px}
.xb-legal__copy{font-size:12px}

/* ---------- 8. 页面通用组件 ---------- */
.xb-section{position:relative;padding-block:clamp(34px,5vw,72px)}
.xb-section + .xb-section{border-top:1px solid var(--xb-line-soft)}

.xb-eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--xb-mono);font-size:12px;letter-spacing:.2em;
  text-transform:uppercase;color:var(--xb-cyan);
}
.xb-eyebrow::before{content:"";width:22px;height:1px;background:currentColor;opacity:.7}

.xb-prose{max-width:40em;font-size:17px;line-height:1.85;color:var(--xb-paper)}
.xb-prose p,.xb-prose ul,.xb-prose ol{margin-bottom:1.1em}
.xb-prose h2,.xb-prose h3{margin:1.6em 0 .6em}
.xb-prose ul li{position:relative;padding-left:20px;margin-bottom:.5em}
.xb-prose ul li::before{content:"";position:absolute;left:2px;top:.78em;width:8px;height:2px;background:var(--xb-cyan)}
.xb-prose a{color:var(--xb-cyan)}
.xb-prose strong{font-weight:800}
.xb-prose code{
  font-family:var(--xb-mono);font-size:.92em;padding:.1em .42em;border-radius:6px;
  background:rgba(47,224,208,.10);border:1px solid rgba(47,224,208,.22);color:var(--xb-cyan);
}

.xb-breadcrumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  margin-bottom:clamp(16px,2vw,26px);
  font-family:var(--xb-mono);font-size:12px;letter-spacing:.06em;color:var(--xb-muted);
}
.xb-breadcrumb__link{color:var(--xb-muted);text-decoration:none}
.xb-breadcrumb__link:hover{color:var(--xb-cyan)}
.xb-breadcrumb__sep{color:rgba(147,163,184,.5)}
.xb-breadcrumb__item[aria-current="page"]{color:var(--xb-paper)}

.xb-grid{display:grid;grid-template-columns:minmax(0,1fr);gap:clamp(16px,2.4vw,26px)}
@media (min-width:640px){
  .xb-grid--2,.xb-grid--3,.xb-grid--4{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (min-width:1024px){
  .xb-grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
  .xb-grid--4{grid-template-columns:repeat(4,minmax(0,1fr))}
  .xb-grid--offset > *:nth-child(even){margin-top:30px}
}

.xb-card{
  position:relative;padding:clamp(18px,2.4vw,26px);
  border-radius:var(--xb-r-lg);border:1px solid var(--xb-line);
  background-image:linear-gradient(160deg, rgba(11,31,38,.9), rgba(7,11,24,.86));
  transition:border-color var(--xb-t) var(--xb-ease),transform var(--xb-t) var(--xb-ease),box-shadow var(--xb-t) var(--xb-ease);
}
.xb-card:hover{
  border-color:rgba(47,224,208,.45);transform:translateY(-3px);
  box-shadow:0 26px 50px -34px rgba(0,0,0,.95);
}
.xb-card--wine{background-image:linear-gradient(160deg, rgba(42,15,30,.92), rgba(7,11,24,.88))}
.xb-card--cut{clip-path:polygon(0 0,100% 0,100% calc(100% - 22px),calc(100% - 22px) 100%,0 100%)}

/* 图像 / 视觉容器（页面阶段放置 CSS·SVG 主题图） */
.xb-media{
  position:relative;isolation:isolate;width:100%;overflow:hidden;
  border-radius:var(--xb-r-lg);border:1px solid var(--xb-line);
  background-image:linear-gradient(150deg,#0B1F26,#070B18 56%,#2A0F1E);
}
.xb-media::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:
    radial-gradient(420px 260px at 78% 10%, rgba(47,224,208,.22), transparent 66%),
    radial-gradient(360px 300px at 12% 94%, rgba(255,122,47,.18), transparent 68%);
}
.xb-media::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:
    linear-gradient(rgba(232,238,245,.06) 1px,transparent 1px),
    linear-gradient(90deg,rgba(232,238,245,.06) 1px,transparent 1px);
  background-size:38px 38px;
  -webkit-mask-image:linear-gradient(180deg,rgba(0,0,0,.75),transparent 78%);
  mask-image:linear-gradient(180deg,rgba(0,0,0,.75),transparent 78%);
}
.xb-media img,.xb-media svg,.xb-media video{
  position:relative;z-index:1;width:100%;height:100%;object-fit:cover;
}
.xb-media--16x9{aspect-ratio:16/9}
.xb-media--4x3{aspect-ratio:4/3}
.xb-media--1x1{aspect-ratio:1/1}
.xb-media--portrait{aspect-ratio:3/4}
.xb-media__cap{
  position:absolute;left:14px;bottom:12px;z-index:2;
  padding:4px 11px;border-radius:var(--xb-pill);
  border:1px solid var(--xb-line);background:rgba(7,11,24,.74);
  font-family:var(--xb-mono);font-size:11px;letter-spacing:.1em;color:var(--xb-cyan);
}
.xb-figure{display:flex;flex-direction:column;gap:10px;margin:0}
.xb-figure__caption{font-size:13px;line-height:1.7;color:var(--xb-muted)}

/* 分段切换 / 面板 */
.xb-seg{
  display:inline-flex;flex-wrap:wrap;gap:4px;padding:5px;
  border-radius:var(--xb-pill);border:1px solid var(--xb-line);
  background:rgba(11,31,38,.85);
}
.xb-seg__btn{
  appearance:none;border:0;background:transparent;cursor:pointer;
  padding:9px 18px;border-radius:var(--xb-pill);
  font-family:var(--xb-sans);font-size:14px;font-weight:700;color:var(--xb-muted);
  transition:color var(--xb-t) var(--xb-ease),background var(--xb-t) var(--xb-ease);
}
.xb-seg__btn:hover{color:var(--xb-paper)}
.xb-seg__btn[aria-selected="true"]{
  color:#fff;
  background-image:linear-gradient(120deg, rgba(47,224,208,.24), rgba(255,122,47,.18));
  box-shadow:inset 0 0 0 1px rgba(47,224,208,.42);
}
.xb-panel{padding-top:clamp(16px,2.4vw,26px)}
.xb-panel[hidden]{display:none}
.xb-panel.is-active{animation:xb-fade var(--xb-t) var(--xb-ease) both}
@keyframes xb-fade{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}

/* ---------- 9. 显现与动效 ---------- */
html.xb-js [data-reveal]{
  opacity:0;transform:translateY(16px);
  transition:opacity 420ms var(--xb-ease),transform 420ms var(--xb-ease);
}
html.xb-js [data-reveal].is-in{opacity:1;transform:none}
html.xb-js .xb-timeline::before{
  transform:scaleX(0);transform-origin:left center;
  transition:transform 700ms var(--xb-ease);
}
html.xb-js .xb-timeline.is-in::before{transform:scaleX(1)}

/* ---------- 10. 响应式与可访问性 ---------- */
@media (max-width:1023px){
  #main-content{padding-top:clamp(16px,4vw,30px)}
}
@media (max-width:480px){
  body{font-size:15.5px}
  .xb-rail{padding:22px 14px 18px}
  .xb-cta,.xb-btn{width:100%}
  .xb-rail__bottom .xb-cta{width:100%}
}

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