*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
body{font-family:"Noto Sans SC",system-ui,sans-serif;background:#fff;color:#1e1b4b;line-height:1.78;font-size:16px}
a{color:#4338ca;text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%;height:auto;display:block}

.site-header{background:#fff;border-bottom:2px solid #e0e7ff;position:sticky;top:0;z-index:300}
.header-inner{max-width:1160px;margin:0 auto;padding:12px 20px;display:flex;align-items:center;justify-content:space-between;gap:16px}
.brand{display:flex;align-items:center;gap:10px;color:#1e1b4b;font-weight:600;font-size:.97rem}
.brand em{font-style:normal;color:#4f46e5;font-weight:700}
.site-nav ul{display:flex;flex-wrap:wrap;gap:6px 18px;list-style:none}
.site-nav a{color:#334155;font-size:.92rem}
.site-nav a.active{color:#4f46e5;font-weight:600}
.nav-toggle{display:none;background:none;border:0;cursor:pointer;padding:8px}
.nav-toggle span{display:block;width:22px;height:2px;background:#334155;margin:5px 0;border-radius:1px}

.ads-top-bar{background:#eef2ff;border-bottom:1px solid #c7d2fe;padding:10px 0}
#applist .applist-title{font-size:.85rem;color:#64748b;margin-bottom:8px}
#ads{display:flex;flex-wrap:wrap;gap:12px}

.shell{max-width:1160px;margin:0 auto;padding:0 20px 56px;display:grid;grid-template-columns:1fr 200px;gap:32px;align-items:start}
.shell-main{min-width:0}

.intro-panel{padding:38px 0 28px;border-bottom:3px double #e0e7ff;margin-bottom:8px}
.intro-panel .intro-label{display:inline-block;font-size:.8rem;color:#4338ca;background:#eef2ff;padding:6px 16px;border-radius:20px 4px 20px 4px;margin-bottom:14px;font-weight:500;letter-spacing:.02em}
.intro-panel h1{font-size:clamp(1.36rem,3.5vw,1.95rem);line-height:1.34;margin-bottom:16px;color:#0f172a;max-width:720px;font-weight:700}
.intro-panel .intro-lead{font-size:1.01rem;color:#475569;max-width:760px;margin-bottom:12px}
.chip-list{display:flex;flex-wrap:wrap;gap:8px;margin-top:16px}
.chip-list span{font-size:.77rem;background:#f5f3ff;color:#5b21b6;padding:5px 13px;border-radius:6px;border:1px solid #ddd6fe}

.side-rail{position:sticky;top:76px;padding-top:28px}
.side-rail h2{font-size:.84rem;color:#64748b;letter-spacing:.05em;margin-bottom:12px;font-weight:600;text-transform:uppercase}
.side-rail ul{list-style:none;font-size:.83rem;line-height:2.05}
.side-rail a{color:#475569;padding:2px 0 2px 14px;display:block;border-left:3px solid #e0e7ff;transition:border-color .15s,color .15s}
.side-rail a:hover{color:#4f46e5;border-left-color:#818cf8}

.stagger-grid{display:grid;grid-template-columns:repeat(12,1fr);gap:20px 24px;padding:28px 0}
.tile{background:#fff;border:1px solid #e0e7ff;border-radius:14px 4px 14px 4px;padding:22px 24px;box-shadow:4px 4px 0 #eef2ff;transition:transform .18s,box-shadow .18s}
.tile:hover{transform:translateY(-3px);box-shadow:5px 6px 0 #c7d2fe}
.tile h2{font-size:1.12rem;margin-bottom:12px;color:#0f172a;padding-bottom:7px;border-bottom:2px solid #f5f3ff}
.tile p{margin-bottom:11px;color:#334155;font-size:.94rem}
.tile figure{margin:16px 0 0;border-radius:10px;overflow:hidden;border:1px solid #e0e7ff}
.tile figcaption{font-size:.78rem;color:#64748b;margin-top:7px;text-align:center;font-style:italic}

.span-6{grid-column:span 6}
.span-7{grid-column:span 7}
.span-5{grid-column:span 5}
.span-8{grid-column:span 8}
.span-4{grid-column:span 4}
.span-12{grid-column:span 12}
.drop-a{margin-top:36px}
.lift-b{margin-top:-18px}
.nudge-left{margin-left:-12px}
.nudge-right{margin-right:-12px}
.pad-tall{padding-bottom:32px}

.note-box{background:linear-gradient(135deg,#eef2ff,#f5f3ff);border-left:4px solid #6366f1;padding:13px 17px;margin:12px 0;border-radius:0 10px 10px 0;font-size:.92rem;color:#3730a3}

.faq-zone{padding:32px 0;border-top:3px double #e0e7ff;margin-top:12px}
.faq-zone h2{font-size:1.2rem;margin-bottom:16px;color:#0f172a}
.faq-row{border:1px solid #e0e7ff;border-radius:4px 14px 4px 14px;padding:17px 19px;margin-bottom:12px;background:#fafafa}
.faq-row h3{font-size:.98rem;margin-bottom:7px;color:#1e293b}

.end-strip{max-width:1160px;margin:0 auto;padding:0 20px 44px}
.end-strip h2{font-size:1.08rem;margin-bottom:10px}
.end-strip p{color:#475569;font-size:.95rem;margin-bottom:8px}

.site-footer{background:#f8fafc;border-top:2px solid #e0e7ff;padding:26px 20px;text-align:center;font-size:.87rem;color:#64748b}
.footer-links{display:flex;flex-wrap:wrap;justify-content:center;gap:8px 20px;margin-bottom:10px}
.footer-sub{font-size:.81rem;color:#94a3b8;margin-top:6px}
.prose-page{max-width:720px;margin:40px auto;padding:0 20px}
.prose-page h1{font-size:1.38rem;margin-bottom:16px}
.error-page{max-width:480px;margin:80px auto;padding:0 20px;text-align:center}

@media(max-width:960px){
  .shell{grid-template-columns:1fr}
  .side-rail{position:static;order:-1;padding:16px 0;border-bottom:1px solid #e0e7ff}
  .side-rail ul{display:flex;flex-wrap:wrap;gap:6px 10px}
  .side-rail a{border-left:0;padding:5px 12px;background:#eef2ff;border-radius:14px;font-size:.79rem}
  .span-6,.span-7,.span-5,.span-8,.span-4,.span-12{grid-column:span 12}
  .drop-a,.lift-b,.nudge-left,.nudge-right{margin:0}
}

@media(max-width:768px){
  .nav-toggle{display:block}
  .site-nav{position:absolute;top:100%;left:0;right:0;background:#fff;border-bottom:1px solid #e0e7ff;display:none;padding:12px 20px}
  .site-nav.is-open{display:block}
  .site-header{position:relative}
}