*,*::before,*::after{box-sizing:border-box}
body{margin:0;font-family:"PingFang SC","Microsoft YaHei",sans-serif;color:#222;background:#fff;line-height:1.75}
img{max-width:100%;height:auto;display:block}
a{color:#2563eb;text-decoration:none}
a:hover{text-decoration:underline}
.container{width:min(960px,calc(100% - 32px));margin:0 auto}

.site-header{padding:18px 0;border-bottom:1px solid #eee;background:#fff}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:16px}
.brand{display:flex;align-items:center;gap:12px;color:inherit;text-decoration:none}
.brand:hover{text-decoration:none}
.brand img{width:44px;border-radius:10px}
.brand h1{margin:0;font-size:20px;font-weight:700;color:#111}
.brand span{display:block;font-size:11px;color:#888;margin-top:2px;letter-spacing:.12em}
.header-links{display:flex;gap:18px;font-size:14px}
.header-links a{color:#555;font-weight:500}
.menu-btn{display:none;border:1px solid #ddd;background:#fff;padding:8px 12px;border-radius:8px;cursor:pointer}

.hero{margin:28px 0 0;border-radius:12px;overflow:hidden;border:1px solid #eee}
.hero img{width:100%;max-height:280px;object-fit:cover}
.hero-caption{padding:14px 18px;background:#fafafa;border-top:1px solid #eee;font-size:14px;color:#555}

.tab-shell{margin:28px 0 48px;border:1px solid #e5e7eb;border-radius:14px;background:#fff;overflow:hidden;box-shadow:0 1px 3px rgba(0,0,0,.04)}
.tab-nav{display:flex;overflow-x:auto;scrollbar-width:thin;background:#f9fafb;border-bottom:1px solid #e5e7eb;-webkit-overflow-scrolling:touch}
.tab-nav::-webkit-scrollbar{height:4px}
.tab-btn{flex:1 0 auto;min-width:max-content;padding:14px 22px;border:none;background:transparent;font:inherit;font-size:14px;font-weight:600;color:#666;cursor:pointer;border-bottom:3px solid transparent;transition:color .15s,border-color .15s,bg .15s;white-space:nowrap}
.tab-btn:hover{color:#111;background:#fff}
.tab-btn[aria-selected="true"]{color:#2563eb;border-bottom-color:#2563eb;background:#fff}
.tab-panel{display:none;padding:28px 26px 32px;animation:fadeIn .25s ease}
.tab-panel.active{display:block}
@keyframes fadeIn{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}

.tab-panel h2{font-size:22px;margin:0 0 14px;color:#111}
.tab-panel h3{font-size:17px;margin:24px 0 10px;color:#333}
.tab-panel p,.tab-panel li{font-size:15px;color:#444}
.tab-panel ul,.tab-panel ol{padding-left:20px;margin:12px 0}
.tab-panel .intro-lead{font-size:17px;color:#333;margin-bottom:20px;padding-bottom:18px;border-bottom:1px dashed #e5e7eb}

.stat-row{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:22px 0}
.stat-card{padding:16px;border:1px solid #eee;border-radius:10px;background:#fafafa;text-align:center}
.stat-card strong{display:block;font-size:22px;color:#2563eb;margin-bottom:4px}
.stat-card span{font-size:12px;color:#666}

.cover-strip{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin:22px 0}
.cover-strip img{border-radius:8px;aspect-ratio:2/3;object-fit:cover;border:1px solid #eee}

.tip-box{margin:20px 0;padding:16px 18px;background:#eff6ff;border-left:4px solid #2563eb;border-radius:0 8px 8px 0;font-size:14px;color:#334155}
.warn-box{margin:20px 0;padding:16px 18px;background:#fef2f2;border-left:4px solid #ef4444;border-radius:0 8px 8px 0;font-size:14px;color:#444}

.checklist{list-style:none;padding:0;margin:18px 0}
.checklist li{padding:10px 0 10px 28px;position:relative;border-bottom:1px solid #f3f4f6;font-size:14px}
.checklist li::before{content:"✓";position:absolute;left:0;color:#16a34a;font-weight:700}

.screen-duo{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin:20px 0}
.screen-duo img{border-radius:10px;border:1px solid #eee;max-height:420px;object-fit:contain;margin:0 auto;background:#fafafa}

.faq-inline{margin-top:24px}
.faq-inline details{border-top:1px solid #e5e7eb;padding:12px 0}
.faq-inline summary{cursor:pointer;font-weight:600;font-size:15px;list-style:none}
.faq-inline summary::-webkit-details-marker{display:none}

.subpage-hero{padding:36px 0 24px;border-bottom:1px solid #eee;margin-bottom:32px}
.subpage-hero h1{font-size:28px;margin:0 0 10px}
.subpage-hero p{margin:0;color:#666;font-size:15px}
.prose{max-width:720px;margin:0 auto;padding-bottom:48px}
.prose h2{font-size:20px;margin:28px 0 12px;color:#111}
.prose p,.prose li{font-size:15px;color:#444}

.footer{margin-top:20px;padding:28px 0 36px;border-top:1px solid #eee;font-size:13px;color:#888;text-align:center}
.footer nav{display:flex;justify-content:center;flex-wrap:wrap;gap:8px 18px;margin-bottom:12px}
.footer a{color:#666}

@media(max-width:720px){
  .header-links{display:none}
  .menu-btn{display:inline-block}
  .mobile-drawer{display:none;flex-direction:column;padding:12px 0;border-top:1px solid #eee}
  .mobile-drawer.open{display:flex}
  .mobile-drawer a{padding:10px 0;color:#444;border-bottom:1px solid #f5f5f5}
  .stat-row{grid-template-columns:1fr}
  .cover-strip{grid-template-columns:repeat(2,1fr)}
  .screen-duo{grid-template-columns:1fr}
  .tab-btn{padding:12px 16px;font-size:13px}
  .tab-panel{padding:20px 16px 24px}
}
@media(max-width:400px){.cover-strip{grid-template-columns:1fr 1fr}}