/* ============================================================
   AI 工具导航 · 首页与详情共享样式
   由 template-ai-nav.php / template-ai-detail.php 通过 bt_ai_head() 引入
   ============================================================ */

:root{
	--ac:#0073aa;--ac2:#0593d3;--soft:#e3f1f7;--bg:#f5f6f8;--card:#fff;
	--tx:#1b1f27;--sub:#8a909c;--bd:#ececf0;--toph:58px;--asw:236px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body.ai-portal{margin:0;background:var(--bg);color:var(--tx);font-size:14px;line-height:1.6;
	font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;-webkit-font-smoothing:antialiased}
body.ai-portal a{color:inherit;text-decoration:none}
body.ai-portal img{max-width:100%}

/* ---------- 顶栏 ---------- */
.ai-top{position:fixed;top:0;left:0;right:0;height:var(--toph);z-index:30;display:flex;align-items:center;
	gap:16px;padding:0 18px;background:#fff;border-bottom:1px solid var(--bd)}
.ai-logo{display:flex;align-items:center;gap:8px;font-weight:800;font-size:18px;color:var(--ac);white-space:nowrap}
.ai-search-wrap{flex:1;max-width:560px;margin:0 auto;position:relative}
.ai-search{width:100%;height:38px;border:1px solid var(--bd);background:#f3f4f6;border-radius:20px;
	padding:0 16px 0 40px;font-size:14px;outline:none;transition:.15s}
.ai-search:focus{background:#fff;border-color:var(--ac);box-shadow:0 0 0 3px rgba(0,115,170,.15)}
.ai-si{position:absolute;left:15px;top:50%;transform:translateY(-50%);color:var(--sub)}
.ai-topnav{display:flex;align-items:center;gap:20px;white-space:nowrap;margin-left:6px}
.ai-topnav .ai-toplink{color:#33373d;font-size:14px;font-weight:500}
.ai-topnav .ai-toplink:hover{color:var(--ac)}
.ai-burger{display:none;border:0;background:none;font-size:22px;line-height:1;color:var(--tx);cursor:pointer;padding:2px 4px}
/* 顶栏图标菜单 + 下拉 */
.ai-dropdown{position:relative}
.ai-dd-trigger{cursor:pointer}
.ai-icon-btn{border:0;background:none;font-size:18px;line-height:1;color:var(--sub);cursor:pointer;padding:6px 9px;border-radius:8px;font-family:inherit}
.ai-icon-btn:hover{background:#f2f3f5;color:var(--ac)}
.ai-toplink{display:inline-flex;align-items:center;gap:3px;color:var(--sub);font-size:13.5px;cursor:pointer;padding:6px 2px;text-decoration:none}
.ai-toplink:hover{color:var(--ac)}
.ai-caret{font-style:normal;font-size:10px;opacity:.7}
.ai-dropdown-panel{position:absolute;top:100%;left:0;background:#fff;border:1px solid var(--bd);border-radius:10px;box-shadow:0 10px 30px rgba(20,30,60,.12);padding:6px;display:none;z-index:40;min-width:168px}
.ai-dropdown:hover .ai-dropdown-panel{display:block}
.ai-dropdown-panel a{display:block;padding:7px 12px;border-radius:7px;color:#3b4048;font-size:13px;white-space:nowrap;text-decoration:none}
.ai-dropdown-panel a:hover{background:#f3f5f9;color:var(--ac)}
.ai-dropdown-grid{grid-template-columns:repeat(2,minmax(118px,1fr));min-width:276px}
.ai-dropdown:hover .ai-dropdown-grid{display:grid}

/* 侧栏收起为"仅图标"模式 */
.ai-collapse-btn{display:flex;align-items:center;border:0;background:none;font-size:18px;line-height:1;color:var(--sub);cursor:pointer;padding:6px 9px;border-radius:8px}
.ai-collapse-btn:hover{background:#f2f3f5;color:var(--ac)}
.ai-aside,.ai-main,.ai-detail,.ai-detail-wrap,.ai-foot{transition:margin-left .2s ease,width .2s ease}
body.ai-collapsed{--asw:66px}
body.ai-collapsed .ai-aside{padding:12px 6px 40px}
body.ai-collapsed .ai-aside h5,body.ai-collapsed .ai-back,body.ai-collapsed .ai-nl .nm,body.ai-collapsed .ai-toggle,body.ai-collapsed .ai-sub{display:none}
body.ai-collapsed .ai-nl-row{justify-content:center}
body.ai-collapsed .ai-nl{justify-content:center;padding:9px 0;gap:0}

/* 收起态：悬停图标弹出浮层（分类名 + 二级）*/
.ai-flyout{display:none;position:fixed;min-width:186px;max-height:80vh;overflow-y:auto;background:#fff;border:1px solid var(--bd);border-radius:12px;box-shadow:0 14px 36px rgba(20,30,60,.16);padding:8px;z-index:1000}
.ai-flyout-head{display:block;padding:7px 12px;font-weight:700;color:var(--tx);font-size:14px;border-bottom:1px solid var(--bd);margin-bottom:4px}
.ai-flyout-head:hover{color:var(--ac)}
.ai-flyout-item{display:block;padding:7px 12px;border-radius:7px;color:#5a6068;font-size:13px;white-space:nowrap}
.ai-flyout-item:hover{background:#f3f5f9;color:var(--ac)}

/* 首页 hero 大搜索（ai-bot 风格）+ 引擎切换 */
.ai-hero-search{max-width:700px;margin:16px 0 4px}
.ai-search-box{display:flex;align-items:center;background:#eceef1;border-radius:26px;padding:4px 5px 4px 20px}
.ai-search-box input{flex:1;min-width:0;border:0;background:none;outline:none;font-size:15px;height:42px;color:var(--tx)}
.ai-search-btn{flex:0 0 auto;border:0;background:var(--ac);color:#fff;width:46px;height:42px;border-radius:22px;cursor:pointer;font-size:16px}
.ai-search-btn:hover{background:#005f8c}
.ai-engines{display:flex;flex-wrap:wrap;gap:24px;margin:14px 0 0;padding-left:10px}
.ai-engine{border:0;background:none;color:var(--sub);font-size:14px;cursor:pointer;padding:2px 0;position:relative;font-family:inherit}
.ai-engine:hover{color:var(--ac)}
.ai-engine.active{color:var(--ac);font-weight:600}
.ai-engine.active::after{content:"";position:absolute;left:0;right:0;bottom:-6px;height:2px;background:var(--ac);border-radius:2px}

/* ---------- 左侧分类栏（仅首页） ---------- */
.ai-aside{position:fixed;top:var(--toph);bottom:0;left:0;width:var(--asw);z-index:20;background:#fff;
	border-right:1px solid var(--bd);overflow-y:auto;padding:12px 10px 40px}
.ai-aside h5{margin:12px 8px 6px;font-size:12px;color:var(--sub);font-weight:600;letter-spacing:.5px}
.ai-nl{display:flex;align-items:center;gap:10px;padding:8px 10px;border-radius:9px;color:#3b4048;margin:2px 0}
.ai-nl:hover{background:#f3f5f9}
.ai-nl.active{background:var(--soft);color:var(--ac);font-weight:600}
.ai-nl .nm{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.ai-nl .ct{font-size:11px;color:var(--sub);background:#f0f1f4;border-radius:9px;padding:1px 7px}
.ai-nl.active .ct{background:#fff;color:var(--ac)}
.ai-ico{width:26px;height:26px;border-radius:7px;color:#fff;font-size:13px;font-weight:700;display:flex;
	align-items:center;justify-content:center;flex:0 0 auto}
.ai-back{display:flex;align-items:center;gap:8px;padding:8px 10px;border-radius:9px;color:var(--sub);margin-bottom:4px}
.ai-back:hover{background:#f3f5f9;color:var(--ac)}
/* 侧栏一级分组 + 可折叠子分类 */
.ai-group{margin:1px 0;position:relative}
.ai-nl-row{display:flex;align-items:center;gap:2px}
.ai-nl-row .ai-nl{flex:1;min-width:0;margin:0}
.ai-toggle{flex:0 0 auto;border:0;background:none;cursor:pointer;color:#9aa0a8;width:24px;height:30px;padding:0;border-radius:6px;display:flex;align-items:center;justify-content:center}
.ai-toggle::before{content:"\203A";font-size:17px;line-height:1;transition:transform .15s}
.ai-toggle:hover{background:#eef0f3;color:var(--ac)}
.ai-group.open .ai-toggle::before{transform:rotate(90deg)}
.ai-sub{display:none;margin:2px 0 6px 13px;padding-left:11px;border-left:1px solid #eef0f3}
.ai-group.open .ai-sub{display:block}
.ai-nl-sub{display:flex;align-items:center;gap:8px;padding:5px 9px;border-radius:7px;color:#5a6068;font-size:13px;margin:1px 0}
.ai-nl-sub:hover{background:#f3f5f9}
.ai-nl-sub.active{background:var(--soft);color:var(--ac);font-weight:600}
.ai-nl-sub .nm{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.ai-nl-sub .ct{font-size:11px;color:var(--sub)}

/* ---------- 首页主区 ---------- */
.ai-main{margin-left:var(--asw);padding:calc(var(--toph) + 22px) 26px 36px;min-height:100vh}
.ai-hero h1{margin:0 0 4px;font-size:24px;font-weight:800}
.ai-hero p{margin:0;color:var(--sub)}
.ai-sec{margin:26px 0 4px;scroll-margin-top:calc(var(--toph) + 14px)}
.ai-sec-h{display:flex;align-items:center;gap:10px;margin:0 0 14px}
.ai-sec-h .ai-ico{width:28px;height:28px;border-radius:8px}
.ai-sec-h h2{margin:0;font-size:18px;font-weight:700}
.ai-sec-h .more{margin-left:auto;font-size:13px;color:var(--sub)}
.ai-sec-h .more:hover{color:var(--ac)}
.ai-subsec-h{font-size:15px;font-weight:600;color:#3b4048;margin:20px 0 10px;padding-left:10px;border-left:3px solid #cfdbf0;scroll-margin-top:calc(var(--toph) + 14px)}

/* 二级页签（ai-bot 风格：浅灰容器 + 实心选中胶囊）*/
.ai-tabs{display:flex;flex-wrap:wrap;gap:4px;background:#f2f3f5;border-radius:12px;padding:5px;margin:0 0 16px}
.ai-tab{border:0;background:none;color:#5a6068;font-size:13px;padding:6px 14px;border-radius:9px;cursor:pointer;line-height:1.6;white-space:nowrap;font-family:inherit}
.ai-tab:hover{color:var(--ac)}
.ai-tab.active{background:var(--ac);color:#fff;font-weight:500}
.ai-tabpanel{display:none}
.ai-tabpanel.active{display:block}

/* ---------- 卡片网格（首页 + 详情相关推荐共用） ---------- */
.ai-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(238px,1fr));gap:14px}
.ai-cw{position:relative}
.ai-card{display:flex;gap:12px;padding:15px 16px;height:100%;min-height:84px;background:var(--card);
	border:1px solid var(--bd);border-radius:13px;transition:.16s ease}
.ai-card:hover{border-color:#a9d6e8;box-shadow:0 8px 22px rgba(0,80,120,.12);transform:translateY(-2px)}
.ai-card .logo{width:46px;height:46px;border-radius:11px;flex:0 0 auto;object-fit:cover}
.ai-card .logo.letter{display:flex;align-items:center;justify-content:center;color:#fff;font-size:20px;font-weight:700}
.ai-card .bd{min-width:0;display:flex;flex-direction:column;justify-content:center}
.ai-card .nm{font-weight:700;font-size:15px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.ai-card .ds{margin-top:3px;color:var(--sub);font-size:12.5px;line-height:1.5;display:-webkit-box;
	-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.ai-official{position:absolute;top:10px;right:10px;font-size:11px;color:var(--ac);background:var(--soft);
	border-radius:11px;padding:2px 8px;opacity:0;transition:.15s}
.ai-cw:hover .ai-official{opacity:1}
.ai-official:hover{background:var(--ac);color:#fff}

/* logo 图片叠加层（favicon / 特色图 / nav_logo；加载失败 onerror 移除→露出首字母） */
.logo.letter{position:relative;overflow:hidden}
.logo-img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;border-radius:inherit;background:#fff}

/* 分类图标：emoji（浅底）/ 图片 */
.ai-ico-emoji{background:#eef1f5;font-size:15px;font-weight:400}
.ai-sec-h .ai-ico-emoji{font-size:17px}
.ai-ico-img{background:#fff;overflow:hidden;padding:0}
.ai-ico-img img{width:100%;height:100%;object-fit:cover;border-radius:inherit}

.ai-empty{padding:16px;color:var(--sub);background:#fff;border:1px dashed var(--bd);border-radius:12px;margin:4px 0}

/* ---------- 页脚 ---------- */
.ai-foot{margin-left:var(--asw);padding:20px 26px;color:var(--sub);font-size:12px;text-align:center;
	border-top:1px solid var(--bd);background:#fff}
.ai-foot a{color:var(--ac)}

/* ---------- 移动端 ---------- */
.ai-mask{display:none;position:fixed;inset:0;top:var(--toph);background:rgba(0,0,0,.35);z-index:15}
@media(max-width:820px){
	.ai-aside{transform:translateX(-100%);transition:transform .25s;box-shadow:2px 0 16px rgba(0,0,0,.12)}
	body.ai-open .ai-aside{transform:none}
	body.ai-open .ai-mask{display:block}
	.ai-main,.ai-foot,.ai-detail,.ai-detail-wrap{margin-left:0}
	.ai-burger{display:block}
	.ai-topnav{display:none}
	.ai-search-wrap{max-width:none}
}
@media(max-width:520px){.ai-official{opacity:1}.ai-logo .txt{display:none}}

/* ============================================================
   详情页（单栏居中、无左侧分类栏）
   ============================================================ */
.ai-detail-wrap{margin-left:var(--asw);display:flex;align-items:flex-start;gap:24px;padding:calc(var(--toph) + 22px) 30px 44px;max-width:1440px}
.ai-detail{flex:1 1 auto;min-width:0;max-width:1000px}
/* 右侧栏：工具推荐 / 最新工具 */
.ai-rail{flex:0 0 268px;width:268px;position:sticky;top:calc(var(--toph) + 22px)}
.ai-rail-box{background:#fff;border:1px solid var(--bd);border-radius:14px;padding:12px 14px 14px;margin-bottom:16px}
.ai-rail-h{margin:2px 0 10px;font-size:14px;font-weight:700;color:var(--tx)}
.ai-rail-list{display:flex;flex-direction:column;gap:2px}
.ai-rail-item{display:flex;align-items:center;gap:9px;padding:7px 6px;border-radius:8px}
.ai-rail-item:hover{background:var(--soft)}
.ai-rail-item .logo{position:relative;width:34px;height:34px;border-radius:8px;flex:0 0 auto;display:flex;align-items:center;justify-content:center;color:#fff;font-size:16px;font-weight:700;overflow:hidden}
.ai-rail-nm{font-size:13.5px;color:var(--tx);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.ai-rail-item:hover .ai-rail-nm{color:var(--ac)}
@media(max-width:1080px){.ai-rail{display:none}}
.ai-crumb{color:var(--sub);font-size:13px;margin:0 0 14px}
.ai-crumb a:hover{color:var(--ac)}

.ai-hero-card{display:flex;gap:18px;background:#fff;border:1px solid var(--bd);border-radius:16px;padding:22px 24px}
.ai-hero-card .logo{width:64px;height:64px;border-radius:15px;flex:0 0 auto;object-fit:cover}
.ai-hero-card .logo.letter{display:flex;align-items:center;justify-content:center;color:#fff;font-size:28px;font-weight:700}
.ai-hero-main{flex:1;min-width:0}
.ai-hero-main h1{margin:0 0 6px;font-size:23px;font-weight:800}
.ai-hero-desc{margin:0 0 12px;color:var(--sub)}
.ai-hero-meta{display:flex;gap:8px;flex-wrap:wrap;align-items:center;margin-bottom:14px}
.ai-chip{font-size:12px;color:var(--sub);background:#f0f2f5;border-radius:8px;padding:3px 10px}
.ai-chip.cat{color:var(--ac);background:var(--soft)}
.ai-visit{display:inline-flex;align-items:center;gap:6px;background:var(--ac);color:#fff;
	padding:9px 20px;border-radius:10px;font-weight:600;font-size:14px}
.ai-visit:hover{background:#005f8c}

.ai-detail-body{background:#fff;border:1px solid var(--bd);border-radius:16px;padding:6px 28px 26px;margin-top:16px}
.ai-detail-body h2{font-size:18px;font-weight:700;margin:28px 0 12px;padding-left:12px;border-left:3px solid var(--ac);line-height:1.35}
.ai-detail-body h3{font-size:16px;margin:18px 0 8px}
.ai-detail-body p{margin:10px 0;color:#33383f;line-height:1.85}
.ai-detail-body ul,.ai-detail-body ol{padding-left:22px;margin:10px 0}
.ai-detail-body li{margin:6px 0;line-height:1.8}
.ai-detail-body .paragraph{margin:4px 0}
.ai-detail-body a{color:var(--ac)}
.ai-detail-body img{border-radius:8px;margin:8px 0}
.ai-detail-body table{border-collapse:collapse;width:100%;margin:14px 0;font-size:13px;display:block;overflow-x:auto}
.ai-detail-body th,.ai-detail-body td{border:1px solid var(--bd);padding:8px 10px;text-align:left;vertical-align:top}
.ai-detail-body thead th{background:#f7f8fa}

.ai-related{margin-top:26px}
.ai-related h2{font-size:18px;font-weight:700;margin:0 0 14px}

@media(max-width:560px){
	.ai-hero-card{flex-direction:column;gap:12px;padding:18px}
	.ai-detail-body{padding:6px 18px 20px}
}