@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@300;400;500;600;700&display=swap');

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --xb-indigo:#1a1f4e;
  --xb-coral:#ff6b5b;
  --xb-teal:#2dd4bf;
  --xb-gold:#f5c842;
  --xb-cream:#faf8f5;
  --xb-slate:#4a5568;
  --xb-glass:rgba(255,255,255,.72);
  --xb-shadow:0 8px 32px rgba(26,31,78,.12);
  --xb-radius:18px;
  --xb-nav-h:64px;
  --xb-dl-h:0px;
}
html{scroll-behavior:smooth;font-size:16px}
body{
  font-family:'Noto Sans SC',system-ui,sans-serif;
  background:var(--xb-cream);
  color:var(--xb-indigo);
  line-height:1.75;
  overflow-x:hidden;
}
body.xb-dl-active{padding-top:calc(var(--xb-nav-h) + var(--xb-dl-h))}
a{color:var(--xb-coral);text-decoration:none;transition:color .2s}
a:hover{color:var(--xb-teal)}

/* 顶部导航 */
.xb-topbar{
  position:fixed;top:0;left:0;right:0;z-index:1000;
  height:var(--xb-nav-h);
  background:var(--xb-glass);
  backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);
  border-bottom:1px solid rgba(26,31,78,.08);
  transition:box-shadow .3s;
}
.xb-topbar.xb-scrolled{box-shadow:var(--xb-shadow)}
.xb-topbar-inner{
  max-width:1200px;margin:0 auto;padding:0 20px;
  height:100%;display:flex;align-items:center;justify-content:space-between;
}
.xb-brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:1.05rem;color:var(--xb-indigo)}
.xb-brand img{width:38px;height:38px;border-radius:10px;object-fit:cover}
.xb-nav-desktop{display:flex;gap:28px;list-style:none}
.xb-nav-desktop a{color:var(--xb-slate);font-weight:500;font-size:.95rem}
.xb-nav-desktop a:hover,.xb-nav-desktop a.xb-active{color:var(--xb-coral)}
.xb-burger{
  display:none;background:none;border:none;cursor:pointer;
  width:40px;height:40px;flex-direction:column;justify-content:center;align-items:center;gap:5px;
}
.xb-burger span{display:block;width:24px;height:2px;background:var(--xb-indigo);border-radius:2px;transition:.3s}
.xb-burger.xb-open span:nth-child(1){transform:rotate(45deg) translate(5px,5px)}
.xb-burger.xb-open span:nth-child(2){opacity:0}
.xb-burger.xb-open span:nth-child(3){transform:rotate(-45deg) translate(5px,-5px)}
.xb-nav-mobile{
  display:none;position:fixed;top:var(--xb-nav-h);left:0;right:0;
  background:var(--xb-glass);backdrop-filter:blur(20px);
  padding:20px;border-bottom:1px solid rgba(26,31,78,.08);
  z-index:999;transform:translateY(-120%);transition:transform .35s ease;
}
.xb-nav-mobile.xb-show{display:block;transform:translateY(0)}
.xb-nav-mobile ul{list-style:none;display:flex;flex-direction:column;gap:16px}
.xb-nav-mobile a{font-size:1.05rem;color:var(--xb-indigo);font-weight:500;display:block;padding:8px 0}

/* 固定下载栏 */
.xb-dl-strip{
  position:fixed;top:var(--xb-nav-h);left:0;right:0;z-index:998;
  background:linear-gradient(135deg,rgba(26,31,78,.95),rgba(45,212,191,.85));
  backdrop-filter:blur(12px);padding:10px 16px;
  transform:translateY(-100%);opacity:0;transition:transform .35s,opacity .35s;
  pointer-events:none;
}
.xb-dl-strip.xb-visible{transform:translateY(0);opacity:1;pointer-events:auto}
.xb-dl-strip-inner{
  max-width:1200px;margin:0 auto;
  display:flex;flex-wrap:wrap;justify-content:center;gap:10px;
}
.xb-dl-strip-inner a{display:flex;flex-direction:column;align-items:center;width:calc(20% - 8px);text-decoration:none}
.xb-dl-strip-inner img{width:52px;height:52px;border-radius:14px;object-fit:cover;border:2px solid rgba(255,255,255,.3)}
.xb-dl-strip-inner span{font-size:10px;color:#fff;margin-top:4px;max-width:60px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
@media(min-width:768px){
  .xb-dl-strip-inner a{width:calc(12.5% - 9px)}
  .xb-dl-strip-inner img{width:48px;height:48px}
}

/* 推广区域 */
.xb-promo-zone{padding:calc(var(--xb-nav-h) + 16px) 20px 0;max-width:1200px;margin:0 auto}
.xb-promo-zone #ads{margin:0}

/* Hero */
.xb-hero{
  position:relative;padding:48px 20px 56px;overflow:hidden;
  background:linear-gradient(145deg,var(--xb-indigo) 0%,#2a3070 40%,#1e3a5f 100%);
  color:#fff;text-align:center;
}
.xb-hero::before{
  content:'';position:absolute;top:-40%;right:-20%;width:500px;height:500px;
  background:radial-gradient(circle,rgba(255,107,91,.35) 0%,transparent 70%);
  border-radius:50%;animation:xb-glow 6s ease-in-out infinite alternate;
}
.xb-hero::after{
  content:'';position:absolute;bottom:-30%;left:-15%;width:400px;height:400px;
  background:radial-gradient(circle,rgba(45,212,191,.25) 0%,transparent 70%);
  border-radius:50%;animation:xb-glow 8s ease-in-out infinite alternate-reverse;
}
@keyframes xb-glow{0%{transform:scale(1) translate(0,0)}100%{transform:scale(1.15) translate(20px,-15px)}}
.xb-hero-content{position:relative;z-index:1;max-width:780px;margin:0 auto}
.xb-hero h1{font-size:clamp(1.6rem,5vw,2.4rem);font-weight:700;margin-bottom:16px;line-height:1.35}
.xb-hero-desc{font-size:1rem;opacity:.88;line-height:1.8;max-width:620px;margin:0 auto}

/* 面包屑 */
.xb-crumb{padding:calc(var(--xb-nav-h) + 20px) 20px 0;max-width:1200px;margin:0 auto}
.xb-crumb ol{display:flex;flex-wrap:wrap;gap:6px;list-style:none;font-size:.875rem;color:var(--xb-slate)}
.xb-crumb li::after{content:'›';margin-left:6px;color:var(--xb-coral)}
.xb-crumb li:last-child::after{content:''}
.xb-crumb a{color:var(--xb-slate)}

/* 主内容区 */
.xb-main{max-width:1200px;margin:0 auto;padding:32px 20px 60px}
.xb-section{margin-bottom:48px}
.xb-section-title{
  font-size:1.45rem;font-weight:700;margin-bottom:20px;
  padding-left:14px;border-left:4px solid var(--xb-coral);
}
.xb-section-sub{font-size:1.1rem;font-weight:600;margin:24px 0 12px;color:var(--xb-indigo)}

/* 卡片 */
.xb-card-grid{display:grid;grid-template-columns:1fr;gap:20px}
@media(min-width:640px){.xb-card-grid{grid-template-columns:repeat(2,1fr)}}
@media(min-width:960px){.xb-card-grid{grid-template-columns:repeat(3,1fr)}}
.xb-card{
  background:#fff;border-radius:var(--xb-radius);padding:24px;
  box-shadow:var(--xb-shadow);border:1px solid rgba(26,31,78,.06);
  transition:transform .25s,box-shadow .25s;
}
.xb-card:hover{transform:translateY(-4px);box-shadow:0 12px 40px rgba(26,31,78,.16)}
.xb-card-icon{
  width:48px;height:48px;border-radius:12px;
  background:linear-gradient(135deg,var(--xb-coral),var(--xb-gold));
  display:flex;align-items:center;justify-content:center;
  font-size:1.3rem;margin-bottom:14px;
}
.xb-card h3{font-size:1.05rem;margin-bottom:8px}
.xb-card p{font-size:.925rem;color:var(--xb-slate);line-height:1.7}

/* 图文混排 */
.xb-media-row{display:flex;flex-direction:column;gap:24px;margin-bottom:40px;align-items:center}
@media(min-width:768px){
  .xb-media-row{flex-direction:row;gap:36px}
  .xb-media-row.xb-reverse{flex-direction:row-reverse}
}
.xb-media-row img{
  width:100%;max-width:340px;border-radius:var(--xb-radius);
  box-shadow:var(--xb-shadow);object-fit:cover;
}
.xb-media-body{flex:1}
.xb-media-body p{margin-bottom:14px;color:var(--xb-slate);font-size:.95rem;text-align:justify}

/* 纯文本块 */
.xb-prose p{margin-bottom:16px;color:var(--xb-slate);font-size:.95rem;text-align:justify}
.xb-prose h2{font-size:1.35rem;margin:32px 0 16px;color:var(--xb-indigo)}

/* 标签 */
.xb-tags{display:flex;flex-wrap:wrap;gap:8px;margin:16px 0}
.xb-tag{
  padding:5px 14px;border-radius:20px;font-size:.8rem;font-weight:500;
  background:rgba(45,212,191,.15);color:var(--xb-indigo);
}

/* CTA 下载按钮 */
.xb-cta-btn{
  display:inline-block;padding:12px 32px;border-radius:30px;
  background:linear-gradient(135deg,var(--xb-coral),#ff8f7a);
  color:#fff;font-weight:600;font-size:.95rem;
  box-shadow:0 4px 16px rgba(255,107,91,.35);
  transition:transform .2s,box-shadow .2s;border:none;cursor:pointer;
}
.xb-cta-btn:hover{transform:translateY(-2px);box-shadow:0 6px 24px rgba(255,107,91,.45);color:#fff}

/* 页脚 */
.xb-footer{
  background:var(--xb-indigo);color:rgba(255,255,255,.75);
  padding:40px 20px 32px;text-align:center;
}
.xb-footer-nav{display:flex;flex-wrap:wrap;justify-content:center;gap:20px;margin-bottom:20px;list-style:none}
.xb-footer-nav a{color:rgba(255,255,255,.85);font-size:.9rem}
.xb-footer-nav a:hover{color:var(--xb-teal)}
.xb-footer-copy{font-size:.8rem;opacity:.6}

/* 法律页 */
.xb-legal h2{font-size:1.25rem;margin:28px 0 12px;color:var(--xb-indigo)}
.xb-legal h3{font-size:1.05rem;margin:20px 0 10px}
.xb-legal p,.xb-legal li{margin-bottom:12px;color:var(--xb-slate);font-size:.925rem;line-height:1.8}
.xb-legal ul,.xb-legal ol{padding-left:24px;margin-bottom:16px}

/* 错误页 */
.xb-error{
  min-height:60vh;display:flex;flex-direction:column;
  align-items:center;justify-content:center;text-align:center;padding:40px 20px;
}
.xb-error-code{font-size:5rem;font-weight:700;
  background:linear-gradient(135deg,var(--xb-coral),var(--xb-teal));
  -webkit-background-clip:text;-webkit-text-fill-color:transparent;
}
.xb-error-msg{font-size:1.15rem;margin:12px 0 24px;color:var(--xb-slate)}

/* 动画入场 */
.xb-fade-in{animation:xbFadeIn .6s ease both}
@keyframes xbFadeIn{from{opacity:0;transform:translateY(16px)}to{opacity:1;transform:translateY(0)}}

@media(max-width:767px){
  .xb-nav-desktop{display:none}
  .xb-burger{display:flex}
}
@media(min-width:768px){
  .xb-nav-mobile{display:none!important}
}