*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:Arial,"Microsoft YaHei","PingFang SC","Helvetica Neue",sans-serif;line-height:1.8;overflow-x:hidden}
img{max-width:100%;height:auto;object-fit:contain;display:block}
a{text-decoration:none;color:inherit}
.wrap{width:min(1200px,calc(100% - 40px));margin:0 auto}
.brand{display:flex;align-items:center;gap:12px;font-weight:700}
.brand img{display:block;width:auto;height:38px;max-width:180px;max-height:42px;object-fit:contain;flex-shrink:0}
.btn{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:0 18px;border-radius:999px;border:1px solid transparent;font-weight:700;transition:.2s ease;white-space:nowrap}
.btn-primary{background:var(--btn);color:var(--btnText)}
.btn-outline{background:transparent;color:var(--outlineText);border-color:var(--outlineBorder)}
.actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:18px}
.hero p,.section p,.section li,.footer p{line-height:1.86}
.section h2,.section h3,.footer strong,.hero h1{line-height:1.15}
.faq details{background:#fff;border-radius:18px;padding:16px 18px;margin:0 0 12px;box-shadow:0 10px 22px rgba(0,0,0,.06)}
.faq summary{cursor:pointer;font-weight:700}
.mobile-bar{display:none}
@media (max-width:1024px){.actions{flex-direction:row}}
@media (max-width:768px){.wrap{width:min(100% - 28px,1200px)}.btn{width:auto}.actions{flex-direction:column}.mobile-bar{display:flex}.mobile-bar .btn{width:100%}}


.page-21 .site-header{background:#111C25;color:#fff;border-bottom:1px solid rgba(255,255,255,.08)}
.brand img{display:block;width:auto;height:38px;max-width:180px;max-height:42px;object-fit:contain;flex-shrink:0}
.page-21 .status-bar{padding:10px 0;background:#1A2731;color:#D5E1E7;border-top:1px solid rgba(255,255,255,.06);font-size:13px;letter-spacing:.04em}
.page-21 .status-bar .wrap{display:flex;gap:14px;justify-content:space-between;flex-wrap:wrap}
.page-21 .hero{background:linear-gradient(120deg,#152533 0%,#263D4A 100%);padding:54px 0 28px}
.page-21 .hero-top{display:flex;justify-content:space-between;gap:18px;align-items:flex-start}
.page-21 .hero-top h1{color:#fff;font-size:clamp(34px,4.8vw,62px);margin:6px 0 10px;line-height:1.1;max-width:10ch}
.page-21 .hero-top p{color:#D5E1E7;max-width:60ch}
.page-21 .version-wall{display:grid;grid-template-columns:1.08fr .92fr;gap:18px;align-items:end;margin-top:18px}
.page-21 .wall-stack{display:grid;gap:14px}
.page-21 .wall{background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.12);border-radius:24px;padding:18px 20px;min-height:86px;display:flex;align-items:center;box-shadow:0 24px 50px rgba(0,0,0,.18)}
.page-21 .wall strong{display:block;font-size:18px;color:#fff;margin-bottom:4px}
.page-21 .wall span{display:block;color:#D5E1E7}
.page-21 .wall.one{width:96%}
.page-21 .wall.two{width:84%;margin-left:8%}
.page-21 .wall.three{width:100%;background:rgba(115,224,193,.14)}
.page-21 .hero-device{justify-self:end;align-self:end;background:rgba(255,255,255,.06);padding:12px;border-radius:24px;border:1px solid rgba(255,255,255,.12);max-width:320px}
.page-21 .hero-device img{max-height:260px;width:100%}
.page-21 .section{padding:64px 0;background:#F2F5F7;color:#172A35}
.page-21 .section.alt{background:#E5EDF0}
.page-21 .section h2{color:#172A35;margin:0 0 14px;font-size:clamp(24px,2.6vw,34px)}
.page-21 .section p,.page-21 .section li{color:#53636D;font-size:16px;line-height:1.85}
.page-21 .update-ladder{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.page-21 .ladder{background:#fff;border-radius:22px;padding:18px;border-left:7px solid #73E0C1;box-shadow:0 10px 24px rgba(17,28,37,.08);min-height:144px}
.page-21 .ladder:nth-child(2){margin-top:16px}
.page-21 .ladder:nth-child(3){margin-top:32px}
.page-21 .ladder:nth-child(4){margin-top:48px;border-left-color:#E9B85C}
.page-21 .dual-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.page-21 .note{background:#fff;padding:20px;border-radius:22px;box-shadow:0 10px 24px rgba(17,28,37,.08)}
.page-21 .links{display:flex;flex-wrap:wrap;gap:10px}
.page-21 .links a{color:#172A35;text-decoration:underline;text-underline-offset:3px}
.page-21 .footer{background:#111C25;color:#D5E1E7;padding:20px 0 92px;border-top:1px solid rgba(255,255,255,.08)}
.page-21 .footer-inner{display:grid;grid-template-columns:1fr auto 1fr auto;gap:16px;align-items:center}
.page-21 .footer-tags{display:flex;flex-wrap:wrap;gap:10px;justify-content:center}
.page-21 .tag{display:inline-flex;align-items:center;justify-content:center;min-height:36px;padding:0 14px;border-radius:999px;background:#E9B85C;color:#2A2413;font-size:12px;font-weight:700;letter-spacing:.05em}
.page-21 .mini{max-width:220px;color:#B7C5CC;font-size:13px}
@media (max-width:1024px){.page-21 .version-wall,.page-21 .dual-grid,.page-21 .update-ladder,.page-21 .footer-inner{grid-template-columns:1fr 1fr}.page-21 .hero-top{flex-direction:column}.page-21 .hero-device{justify-self:start}}
@media (max-width:768px){.page-21 .version-wall,.page-21 .dual-grid,.page-21 .update-ladder,.page-21 .footer-inner{grid-template-columns:1fr}.page-21 .hero{padding-top:34px}.page-21 .hero-top h1{max-width:12ch}.page-21 .hero-top .btn{width:100%}.page-21 .hero-device{max-width:220px}.page-21 .wall.one,.page-21 .wall.two,.page-21 .wall.three{width:100%;margin-left:0}.page-21 .footer{padding-bottom:84px}.page-21 .mobile-bar{display:flex;position:fixed;left:0;right:0;bottom:0;z-index:40;background:#111C25;border-top:1px solid rgba(255,255,255,.08);padding:10px 14px;min-height:64px}.page-21 .mobile-bar .btn{width:100%}.page-21 body{padding-bottom:78px}}

.site-brand,.brand{display:inline-flex;align-items:center;gap:12px;flex-shrink:0;min-width:max-content}
.site-logo,.brand img{display:block;width:auto;height:38px;max-width:180px;max-height:42px;object-fit:contain;flex-shrink:0}
@media (max-width:768px){.site-logo,.brand img{width:auto;height:32px;max-width:150px}}