*{box-sizing:border-box;margin:0;padding:0;-webkit-tap-highlight-color:transparent}
html,body{font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;background:#f5f7fa;color:#333;line-height:1.6}
a{color:#4A90E2;text-decoration:none}
img{max-width:100%;display:block}
.container{max-width:960px;margin:0 auto;padding:0 16px}
.site-footer{text-align:center;padding:24px 16px;color:#999;font-size:12px;margin-top:40px;border-top:1px solid #eee}
.site-footer p{margin:4px 0}
.install-btn{position:fixed;bottom:20px;right:20px;background:#4A90E2;color:#fff;border:0;border-radius:24px;padding:12px 20px;box-shadow:0 4px 12px rgba(74,144,226,.4);cursor:pointer;font-size:14px;z-index:99;animation:bounce 2s infinite}
@keyframes bounce{0%,100%{transform:translateY(0)}50%{transform:translateY(-6px)}}
.ad-slot{margin:16px 0;text-align:center;min-height:1px}
.ad-slot:empty{display:none}
.modal{position:fixed;inset:0;background:rgba(0,0,0,.7);display:flex;align-items:center;justify-content:center;z-index:9999;padding:20px}
.modal-content{background:#fff;border-radius:12px;padding:24px;max-width:400px;width:100%;text-align:center}
.btn{display:inline-block;border:0;border-radius:8px;padding:10px 20px;cursor:pointer;font-size:14px;text-decoration:none}
.btn-primary{background:#4A90E2;color:#fff}
.btn-default{background:#eee;color:#333}