*{margin:0;padding:0;box-sizing:border-box}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;font-size:14px;color:#333;background:#f5f7fa;line-height:1.6;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none;-webkit-tap-highlight-color:transparent}
img{max-width:100%;display:block}
.container{max-width:100%;margin:0 auto;padding:0 12px}

/* 顶部导航 - 移动端 */
.site-header{background:#fff;box-shadow:0 2px 8px rgba(0,0,0,.06);position:sticky;top:0;z-index:100}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:52px;gap:10px}
.logo{display:flex;align-items:center;gap:8px;min-width:0}
.logo img{height:30px}
.logo-text{font-size:17px;font-weight:700;color:#1890ff;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.logo-slogan{display:none}
.nav-menu{display:flex;gap:2px;align-items:center;flex-shrink:0}
.nav-link{padding:6px 10px;color:#555;font-size:13px;border-radius:6px;white-space:nowrap}
.nav-link:hover{color:#1890ff}
.nav-link.active{color:#1890ff;font-weight:600}
.nav-login{background:#1890ff;color:#fff!important;font-size:12px;padding:6px 12px}

.flash-message{margin:10px auto;padding:10px 14px;border-radius:6px;font-size:13px}
.flash-success{background:#f6ffed;border:1px solid #b7eb8f;color:#389e0d}
.flash-error{background:#fff2f0;border:1px solid #ffccc7;color:#cf1322}

.main-content{min-height:calc(100vh - 160px);padding:12px 0 30px}

/* 横幅广告 960x60 - 移动端全屏宽度 */
.banner-ad{margin-bottom:12px;border-radius:8px;overflow:hidden;box-shadow:0 2px 8px rgba(0,0,0,.08)}
.banner-ad img{width:100%;height:auto;aspect-ratio:960/60;object-fit:cover}
.banner-placeholder{height:50px;background:linear-gradient(135deg,#667eea,#764ba2);display:flex;align-items:center;justify-content:center;color:#fff;font-size:14px;font-weight:600}

/* 搜索 - 移动端 */
.search-section{margin-bottom:12px}
.search-form{display:flex;gap:8px}
.search-form input{flex:1;height:38px;padding:0 14px;border:1px solid #e0e0e0;border-radius:20px;font-size:14px;background:#fff}
.search-form input:focus{outline:none;border-color:#1890ff}
.search-form button{height:38px;padding:0 20px;background:#1890ff;color:#fff;border:none;border-radius:20px;cursor:pointer;font-size:14px;flex-shrink:0}

/* 分类标签 - 横向滚动 */
.category-tabs{display:flex;gap:8px;margin-bottom:14px;overflow-x:auto;padding-bottom:4px;scrollbar-width:none;-webkit-overflow-scrolling:touch}
.category-tabs::-webkit-scrollbar{display:none}
.cat-tab{padding:5px 14px;background:#fff;border:1px solid #e0e0e0;border-radius:16px;font-size:13px;color:#666;white-space:nowrap;flex-shrink:0}
.cat-tab.active{background:#1890ff;color:#fff;border-color:#1890ff}

.section-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px;padding:0 2px}
.section-header h2{font-size:16px;font-weight:600;color:#222}
.section-count{font-size:12px;color:#999}

/* 图标广告网格 200x200 - 移动端每行4个 */
.icon-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px 8px}
.icon-item{display:flex;flex-direction:column;align-items:center;text-align:center}
.icon-img{width:100%;aspect-ratio:1/1;max-width:80px;border-radius:16px;overflow:hidden;position:relative;background:#fff;box-shadow:0 2px 8px rgba(0,0,0,.08)}
.icon-img img{width:100%;height:100%;object-fit:cover}
.icon-placeholder{width:100%;height:100%;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;font-size:24px;font-weight:700}
.icon-tag{position:absolute;top:0;right:0;background:#ff4d4f;color:#fff;font-size:10px;padding:1px 6px;border-radius:0 16px 0 10px}
.icon-title{font-size:12px;color:#333;margin-top:6px;line-height:1.3;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;max-width:100%}

/* 页脚 */
.site-footer{background:#fff;padding:20px 0;text-align:center;color:#999;font-size:12px;border-top:1px solid #f0f0f0;margin-top:30px}
.footer-contact{margin-top:4px}

.empty-state{text-align:center;padding:50px 20px;color:#999;background:#fff;border-radius:10px;font-size:14px}

/* 平板及以上稍作调整 */
@media(min-width:600px){
    .container{max-width:600px;padding:0 16px}
    .icon-grid{grid-template-columns:repeat(5,1fr);gap:16px 10px}
    .icon-img{max-width:90px}
    .icon-title{font-size:13px}
    .logo-slogan{display:inline;color:#999;font-size:12px}
}
@media(min-width:900px){
    .container{max-width:800px}
    .icon-grid{grid-template-columns:repeat(6,1fr)}
    .icon-img{max-width:100px}
}