/* ==================== AI Hero ==================== */
.ai-hero{background:linear-gradient(135deg,var(--primary) 0%,var(--primary-dark) 100%);color:#fff;padding:50px 20px;text-align:center}
.ai-hero h1{font-size:32px;margin-bottom:10px}
.ai-hero p{font-size:16px;opacity:.85;margin-bottom:24px}
.ai-search{display:flex;max-width:600px;margin:0 auto;gap:0}
.ai-search input{flex:1;padding:14px 20px;font-size:16px;border:none;border-radius:var(--radius) 0 0 var(--radius);outline:none}
.ai-search button{padding:14px 28px;font-size:16px;background:var(--accent-color);color:#fff;border:none;border-radius:0 var(--radius) var(--radius) 0;cursor:pointer;font-weight:600;transition:all .3s}
.ai-search button:hover{background:#E65100}

/* Category tabs */
.cate-tabs{display:flex;gap:10px;flex-wrap:wrap;margin:20px 0;padding-bottom:15px;border-bottom:1px solid var(--border-light)}
.cate-tabs a{padding:6px 18px;border-radius:20px;font-size:14px;background:var(--bg-gray);color:var(--text-light);transition:all .25s}
.cate-tabs a:hover,.cate-tabs a.active{background:var(--primary);color:#fff}

/* Q&A list */
.qa-item{display:flex;gap:16px;padding:20px;margin-bottom:12px;background:var(--bg);border:1px solid var(--border-light);border-radius:var(--radius-lg);transition:all .3s ease}
.qa-item:hover{box-shadow:var(--shadow-md);transform:translateY(-2px)}
.qa-icon{width:40px;height:40px;background:var(--primary-light);border-radius:50%;display:flex;align-items:center;justify-content:center;flex-shrink:0;font-size:18px;color:var(--primary)}
.qa-body{flex:1}
.qa-body h3{font-size:17px;margin-bottom:6px;line-height:1.4}
.qa-body h3 a{color:var(--text)}
.qa-body h3 a:hover{color:var(--primary)}
.qa-body .qa-summary{font-size:14px;color:var(--text-light);margin-bottom:8px;line-height:1.5}
.qa-meta{font-size:12px;color:var(--text-muted);display:flex;gap:15px}
.qa-meta span{display:flex;align-items:center;gap:4px}
.qa-cate{display:inline-block;padding:2px 10px;font-size:11px;background:var(--primary-light);color:var(--primary);border-radius:10px;font-weight:600}

/* Two-column layout */
.page-row{display:flex;gap:30px;margin:30px 0}
.page-main{flex:1;min-width:0}
.page-sidebar{width:280px;flex-shrink:0}

/* sidebar */
.side-block{margin-bottom:24px}
.side-block h4{font-size:16px;margin-bottom:12px;padding-bottom:8px;border-bottom:2px solid var(--primary)}
.side-block ul{list-style:none}
.side-block ul li{margin-bottom:10px}
.side-block ul li a{font-size:14px;display:block;padding:6px 0;border-bottom:1px dashed var(--border);transition:color .25s}
.side-block ul li .qa-num{float:right;color:var(--text-muted);font-size:12px}

/* ==================== AI List Responsive ==================== */
@media(max-width:768px){
    .page-row{flex-direction:column}
    .page-sidebar{width:100%}
    .ai-hero h1{font-size:24px}
    .ai-search input{font-size:14px}
    .qa-item{flex-direction:column;gap:10px}
}
@media(max-width:480px){
    .ai-hero{padding:30px 16px}
    .ai-hero h1{font-size:20px}
    .ai-search{flex-direction:column;gap:8px}
    .ai-search input{border-radius:var(--radius)}
    .ai-search button{border-radius:var(--radius)}
}