/* ==========================================================================
   AI 星图 · AI 工具导航图谱
   版式：OneNav 风格 —— 侧边栏 220px / logo 74px / 顶栏 fixed 74px + placeholder
   品牌紫 #5961f9，浅色 #f9f9f9，深色 #2c2e2f
   ========================================================================== */
:root{
  --brand:#5961f9; --brand-2:#ee9ae5; --brand-hover:#f1404b;
  --bg:#f9f9f9; --card:#fff; --text:#282a2d; --gray:#555; --muted:#8a8f99;
  --line:#eceef1; --side-bg:#f9f9f9; --side-text:#515C6B; --side-logo-bg:#fff;
  --shadow:0 26px 40px -24px rgba(0,36,100,.3);
  --side-w:220px; --logo-h:74px; --header-h:74px; --placeholder-h:74px;
  --form-bg:#f1f3f6; --form-text:#6d6e74; --form-border:#f1f3f6;
}
.io-black-mode{
  --bg:#1b1d1f; --card:#2c2e2f; --text:#c6c9cf; --gray:#888; --muted:#989da1;
  --line:#3a3d3f; --side-bg:#2c2e2f; --side-text:#b2b8be; --side-logo-bg:#2c2e2f;
  --shadow:0 26px 40px -24px rgba(2,4,6,.3);
  --form-bg:#2c2e2f; --form-text:#c6c9cf; --form-border:#2c2e2f;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  background:var(--bg); color:var(--text);
  font:14px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
a:hover{color:var(--brand)}
img{max-width:100%}
.container{width:100%;max-width:1900px;margin:0 auto;padding:0 15px}
.text-hide{position:absolute!important;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.d-none{display:none!important}
.text-muted{color:var(--muted)}
.text-xs{font-size:12.5px}
.text-sm{font-size:14px}
.text-lg{font-size:1.125rem}
.text-gray{color:var(--gray)}
.ic{width:18px;height:18px;flex:none;vertical-align:-3px}
.brand-name{font-weight:800;letter-spacing:.5px;color:#23285c;line-height:1}
.io-black-mode .brand-name{color:#fff}
.brand-en{font-size:11px;font-weight:700;letter-spacing:2.5px;color:var(--muted);align-self:center}

/* ── 顶栏（page-header fixed + placeholder）───────────────────────── */
.main-content{margin-left:var(--side-w);min-height:100vh;display:flex;flex-direction:column}
.page-header{position:fixed;right:0;left:0;top:0;z-index:1080;background:#fff;transition:background-color .3s}
.main-content .page-header{left:var(--side-w)}
.io-black-mode .page-header{background:#2c2e2f}
.page-header+.placeholder{height:66px}
.navbar{height:66px;display:flex;align-items:center}
.navbar .container-fluid{display:flex;align-items:center;justify-content:space-between;padding:0 15px;position:relative;height:100%}
.navbar .navbar-brand{display:flex;align-items:center;margin:0;gap:8px}
.navbar-brand img{height:30px;width:auto}
.collapse{display:flex;align-items:center;height:100%}
.header-mini-btn{height:var(--header-h);width:40px;display:flex;align-items:center}
.header-mini-btn label{cursor:pointer;display:block;margin:0}
.header-mini-btn svg{height:60px;width:26px;margin:0 -4px;fill:none;stroke:currentColor;stroke-width:5;stroke-linecap:round}
.header-mini-btn path{transition:all .5s cubic-bezier(.645,.045,.355,1),stroke .2s ease}
.header-mini-btn label:hover path{stroke:var(--brand)}
.header-mini-btn input{position:absolute;opacity:0;pointer-events:none}
.navbar-nav{list-style:none;display:flex;align-items:center;margin:0;padding:0}
.navbar-nav>li{position:relative}
.navbar-nav>li>a{display:block;padding:8px 12px;border-radius:5px;font-size:14.5px;color:inherit;white-space:nowrap}
.navbar-nav>li>a:hover{color:var(--brand)}
.menu-item-has-children>a:after{content:'▾';font-size:11px;margin-left:4px;opacity:.55}
.sub-menu{list-style:none;margin:0;padding:6px;position:absolute;top:100%;left:0;min-width:190px;background:var(--card);
  border:1px solid var(--line);border-radius:8px;box-shadow:var(--shadow);opacity:0;visibility:hidden;transform:translateY(4px);transition:.2s;z-index:60}
.navbar-nav>li:hover>.sub-menu{opacity:1;visibility:visible;transform:none}
.sub-menu li a{display:block!important;padding:8px 15px!important;font-size:13.5px!important;color:var(--text)!important;white-space:nowrap;border-radius:5px}
.sub-menu li a:hover{background:rgba(0,0,0,.06)!important;color:var(--brand)!important}
.navbar-menu{list-style:none;display:flex;align-items:center;margin:0;padding:0}
.mobile-menu{margin-left:16px}
.mobile-menu a{display:inline-flex;align-items:center;justify-content:center;width:40px;height:40px;color:inherit}
@media(max-width:767.98px){
  .navbar{height:66px}
  .navbar .container-fluid{padding:0 15px}
  .navbar-nav{display:none}
  .collapse{display:none}
}
@media(min-width:768px){
  .navbar{height:var(--header-h);padding:0 1rem}
  .page-header+.placeholder{height:var(--placeholder-h)}
}

/* ── 侧边栏 ─────────────────────────────────────────────────────── */
#sidebar{position:fixed;top:0;left:0;bottom:0;width:var(--side-w);z-index:1081;opacity:1!important}
.sidebar-nav-inner{width:inherit;margin:0;max-width:260px;background:#2c2e2f;pointer-events:inherit;display:flex;flex-direction:column;height:100vh;transition:transform .3s cubic-bezier(.25,.8,.25,1)}
.io-grey-mode .sidebar-nav-inner{background:var(--side-bg)}
.sidebar-logo{height:var(--logo-h);display:flex;align-items:center;justify-content:center;border-bottom:1px solid rgba(129,129,129,.15);transition:background-color .2s}
.io-grey-mode .sidebar-logo{background:var(--side-logo-bg)}
.io-grey-mode .border-color{border-color:transparent!important}
.sidebar-logo .logo{line-height:74px;width:100%;text-align:center;overflow:hidden;display:flex;align-items:center;justify-content:center;gap:9px}
.sidebar-logo .logo-expanded,.sidebar-logo .logo-collapsed{display:inline-flex;align-items:center;gap:9px;justify-content:center}
.sidebar-logo img{max-height:40px;width:auto}
.sidebar-logo .logo-collapsed{display:none}
.sidebar-menu{flex:1;display:flex;flex-direction:column;min-height:0;transition:all .3s}
.sidebar-scroll{flex:1;overflow-y:auto;overflow-x:hidden;-webkit-overflow-scrolling:touch}
.sidebar-menu-inner ul{list-style:none;margin:0;padding:0}
.sidebar-menu-inner a,.flex-bottom a{display:flex;overflow:hidden;padding:8px 10px;margin:1.5px 8px;color:var(--side-text);align-items:center;white-space:nowrap;transition:all .3s;border-radius:5px}
.sidebar-menu ul:first-child>li>a{padding:12px 10px}
.sidebar-menu-inner a span,.flex-bottom a span{margin-left:8px}
.sidebar-item{position:relative;display:block}
.sidebar-item ul{display:none;list-style:none;margin:0;padding:0}
.sidebar-item.sidebar-show>ul{display:block}
.sidebar-item ul li{display:block}
.sidebar-menu-inner ul li ul li a{margin-left:36px}
.sidebar-item>a:hover{background:rgba(0,0,0,.05);color:var(--brand)}
.io-black-mode .sidebar-item>a:hover{background:rgba(0,0,0,.1);color:#fff}
.sidebar-item.sidebar-show>a{color:var(--brand)}
.io-black-mode .sidebar-item.sidebar-show>a{color:#fff}
.sidebar-more{position:absolute;cursor:pointer;top:0;right:0;width:38px;height:38px;display:flex;align-items:center;justify-content:center;
  color:var(--gray);transition:transform .3s;z-index:2}
.sidebar-more svg{width:12px;height:12px;stroke:currentColor;stroke-width:2.6;fill:none;stroke-linecap:round;stroke-linejoin:round}
.sidebar-item .sidebar-more{transform:scale(.8)}
.sidebar-show>.sidebar-more{transform:scale(.8) rotate(90deg)}
.sidebar-item>ul>li>a{padding:5px 10px!important;font-size:13px;color:var(--side-text)}
.flex-bottom{padding:0}
.flex-bottom ul{list-style:none;margin:0;padding:0}
.flex-bottom a{font-size:13.5px}
.border-top{border-top:1px solid rgba(129,129,129,.15)}
.py-2{padding:.5rem 0}
/* mini 侧边栏（顶栏汉堡按钮切换） */
.mini-sidebar #sidebar{width:60px}
.mini-sidebar .sidebar-nav-inner{width:60px}
.mini-sidebar .sidebar-logo .logo-expanded{display:none}
.mini-sidebar .sidebar-logo .logo-collapsed{display:flex}
.mini-sidebar .sidebar-menu-inner ul:first-child>li.sidebar-item>a span{display:none}
.mini-sidebar .sidebar-menu-inner ul:first-child>li>ul{display:none}
.mini-sidebar .sidebar-more{display:none}
.mini-sidebar .main-content{margin-left:60px}
.mini-sidebar .main-content .page-header{left:60px}
.mini-sidebar .sidebar-logo .logo{justify-content:center}
/* 移动端抽屉 */
@media(max-width:767.98px){
  #sidebar{display:none;width:100%!important;height:100%!important;z-index:1090!important;background:transparent!important}
  #sidebar.show{display:block}
  .sidebar-nav-inner{width:280px!important;transform:translate3d(-100%,0,0);transition:.3s cubic-bezier(.25,.8,.25,1)}
  #sidebar.show .sidebar-nav-inner{transform:translate3d(0,0,0)}
  .main-content{margin-left:0}
  .main-content .page-header{left:0}
  .sidebar-logo .logo{justify-content:flex-start;padding-left:20px}
}

/* ── hero（对齐 .header-big）───────────────────────────────────── */
body:before{content:'';position:absolute;top:0;left:0;right:0;width:100%;height:550px;z-index:-1;pointer-events:none;
  background:
    radial-gradient(38% 46% at 12% 18%,rgba(124,214,255,.32),transparent 68%),
    radial-gradient(34% 42% at 78% 12%,rgba(255,186,222,.34),transparent 70%),
    radial-gradient(46% 40% at 46% 34%,rgba(196,214,255,.30),transparent 72%),
    radial-gradient(30% 34% at 66% 44%,rgba(255,224,178,.26),transparent 70%);
  filter:blur(10px)}
.io-black-mode body:before{opacity:.45;filter:blur(14px)}
.header-big{position:relative;margin-top:-75px;padding-top:60px;padding-bottom:60px}
.header-big .s-search{margin:0 15px}
.hero-badge{text-align:center;margin:0 auto 18px;max-width:800px}
.hero-badge span{display:inline-block;padding:5px 16px;border-radius:999px;background:#fff;border:1px solid var(--line);
  color:var(--gray);font-size:13px;font-weight:700;letter-spacing:1px;box-shadow:0 2px 10px rgba(30,38,60,.06)}
.io-black-mode .hero-badge span{background:#2c2e2f;border-color:#3a3d3f}
#search{max-width:800px;position:relative;margin:0 auto}
.hero-logo{display:flex;align-items:center;justify-content:center;gap:14px;margin-bottom:14px}
.hero-logo img{height:66px;width:auto}
.hero-words{display:flex;flex-direction:column;align-items:flex-start;line-height:1}
.hero-wordmark{font-size:46px;font-weight:800;letter-spacing:1px;color:#23285c;line-height:1}
.hero-en{margin-top:9px;font-size:13px;font-weight:700;letter-spacing:6px;color:var(--muted)}
.io-black-mode .hero-wordmark{color:#fff}
@media(max-width:767.98px){.hero-wordmark{font-size:32px}.hero-logo img{height:48px}.hero-en{letter-spacing:4px;font-size:11px}}
/* 搜索 tab */
.s-type-list{display:flex;justify-content:center;flex-wrap:wrap;gap:2px;list-style:none;margin:0;padding:0}
.s-type-list label{position:relative;display:inline-block;cursor:pointer}
.s-type-list label span{display:block;padding:10px 20px;font-size:15px;color:var(--gray);opacity:.55;transition:opacity .3s}
.s-type-list label:hover span{opacity:1}
.s-type-list label.active span{opacity:1;color:#23285c;font-weight:600}
.io-black-mode .s-type-list label.active span{color:#fff}
.s-type-list label:not(.active):after{content:'';height:4px;width:4px;border-radius:2px;position:absolute;left:50%;bottom:2px;margin-left:-2px;background:rgba(0,0,0,.18);transition:.3s}
.s-type-list label:not(.active):hover:after{background:#888}
.s-type-list label.active:after{content:'';height:4px;width:10px;border-radius:100px;position:absolute;left:50%;bottom:2px;margin-left:-5px;background:#888}
/* 搜索框 */
.super-search-fm{position:relative;margin:4px auto 0;max-width:800px}
#search-text{width:100%;height:50px;border-radius:50px;font-size:14px;color:#fff;border:1px solid rgba(255,255,255,.05);
  padding:9px 20px;background-color:rgba(0,0,0,.2)!important;-webkit-backdrop-filter:blur(5px);backdrop-filter:blur(5px);outline:none;
  font-family:inherit}
#search-text::placeholder{color:var(--form-text);opacity:1}
.io-black-mode #search-text{background-color:rgba(0,0,0,.45)!important}
#btn_search{position:absolute;top:0;right:0;background:transparent;border:0;width:46px;height:50px;margin:0 8px;cursor:pointer;color:var(--form-text);display:flex;align-items:center;justify-content:center}
#btn_search:hover{color:var(--brand)}
#btn_search .ic{width:20px;height:20px}
/* 搜索引擎切换行 */
.search-list{text-align:center;margin-top:2px}
.search-group{display:none}
.search-group.s-current{display:block}
.search-type{list-style:none;margin:0;padding:0;display:flex;justify-content:center;flex-wrap:wrap}
.search-type li{position:relative;display:inline-block}
.search-type label{display:inline-block;padding:5px 20px;font-size:14px;color:var(--muted);cursor:pointer;opacity:.8;transition:opacity .3s}
.search-type label:hover{opacity:1}
.search-type input:checked+label{opacity:1;color:var(--gray);font-weight:600}
.search-type input:checked+label:before{content:'';border-width:8px 8px 0 8px;border-style:solid;border-color:rgba(0,0,0,.45) transparent transparent;position:absolute;left:50%;top:-8px;margin-left:-8px}

/* ── 内容区 + 卡片网格（对齐 url-card / col-*a 规则）────────────── */
.content{width:100%;padding-bottom:10px}
.content-wrap{width:100%}
.cat-block{margin-bottom:30px}
.cat-head{display:flex;align-items:center;margin-bottom:20px}
.cat-title{display:flex;align-items:center;gap:8px;margin:0;font-size:1.125rem;font-weight:700;color:var(--gray)}
.cat-title .ic{width:20px;height:20px;color:var(--gray)}
.cat-title a:hover{color:var(--brand)}
.cat-count{color:var(--muted);font-size:13px;font-weight:400}
.cat-flex{flex:1}
.cat-more{color:var(--muted);font-size:12.5px;white-space:nowrap}
.cat-more:hover{color:var(--brand)}
.url-cards{display:flex;flex-wrap:wrap;margin:0 -.825rem}
.url-card{width:100%;max-width:50%;padding:0 .825rem}
@media(min-width:992px){.url-card{max-width:33.333333%}}
@media(min-width:1200px){.url-card{max-width:16.666667%}}
.url-card .url-body{transform:translateY(0);will-change:transform;transition:all .3s ease}
.url-card .url-body:hover{transform:translateY(-6px);box-shadow:var(--shadow)}
.url-card .card{display:flex;align-items:center;justify-content:center;background:var(--card);border:1px solid var(--line);border-radius:10px;
  box-shadow:0 2px 10px rgba(30,38,60,.05);transition:border-color .3s;margin-bottom:1.5rem;height:100%}
.url-card .card:hover{border-color:var(--brand)}
.url-card .card-body{position:relative;padding:.938rem;display:flex;align-items:center;width:100%}
.url-card .url-img{width:40px;height:40px;flex:none;background:rgba(128,128,128,.1);overflow:hidden;border-radius:50%;display:flex;align-items:center;justify-content:center;margin-right:.5rem}
.url-card .url-img>img{max-width:100%;max-height:100%;width:100%;height:100%;object-fit:contain;border:0!important}
.url-card .url-info{overflow:hidden;padding-right:5px;flex:1;min-width:0}
.url-info .text-sm{font-size:14px;font-weight:600;display:flex;align-items:center;gap:6px}
.url-info strong{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.overflowClip_1{display:-webkit-box;-webkit-line-clamp:1;-webkit-box-orient:vertical;overflow:hidden}
.url-card .url-desc{margin:0;color:var(--muted);font-size:12px;line-height:1.5}
.nav-empty{color:var(--muted);padding:12px 0}

/* ── 内页 ─────────────────────────────────────────────────────── */
.cat-page,.site-page{padding:22px 15px 34px}
.crumbs{font-size:13px;color:var(--muted);margin-bottom:12px}
.crumbs a:hover{color:var(--brand)}
.crumbs span{margin:0 5px}
.page-title{margin:0 0 4px;font-size:24px;font-weight:800}
.page-title small{font-size:15px;font-weight:400;color:var(--muted)}
.page-desc{color:var(--muted);font-size:13.5px;margin:0 0 16px}
.sub-tabs{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 18px}
.sub-tab{font-size:13px;padding:5px 12px;border-radius:999px;background:var(--card);border:1px solid var(--line);color:var(--muted)}
.sub-tab:hover{border-color:var(--brand);color:var(--brand)}
.sub-tab.is-active{background:var(--brand);border-color:var(--brand);color:#fff}
.pager{display:flex;gap:6px;flex-wrap:wrap;justify-content:center;margin:26px 0}
.pager .pg{min-width:34px;height:34px;display:inline-flex;align-items:center;justify-content:center;border-radius:8px;background:var(--card);border:1px solid var(--line);font-size:13.5px}
.pager .pg:hover{border-color:var(--brand);color:var(--brand)}
.pager .pg.is-active{background:var(--brand);border-color:var(--brand);color:#fff}
.pg-gap{align-self:center;color:var(--muted)}
.site-card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:22px;box-shadow:0 2px 10px rgba(30,38,60,.05)}
.site-head{display:flex;gap:16px;align-items:center;margin-bottom:14px}
.site-head .url-img{width:56px;height:56px;flex:none;background:rgba(128,128,128,.1);border-radius:50%;display:flex;align-items:center;justify-content:center;overflow:hidden}
.site-name{margin:0;font-size:22px;font-weight:800}
.site-desc{margin:0 0 16px;font-size:15px}
.site-meta{display:grid;grid-template-columns:auto 1fr;gap:6px 16px;margin:0 0 18px;font-size:13.5px}
.site-meta dt{color:var(--muted)}
.site-meta dd{margin:0;word-break:break-all}
.site-meta a{color:var(--brand)}
.site-src{margin:14px 0 0;font-size:12.5px;color:var(--muted)}
.site-src a{color:var(--brand)}
.btn-visit{display:inline-block;background:var(--brand);color:#fff;padding:8px 18px;border-radius:8px;font-size:14px}
.btn-visit:hover{opacity:.9;color:#fff}

/* ── 页脚（对齐 footer-type-big）──────────────────────────────── */
.main-footer{background:transparent}
.footer-inner{background:var(--card);border:1px solid var(--line);border-radius:14px;box-shadow:0 2px 10px rgba(30,38,60,.05)}
.footer-text{padding:6px 18px;text-align:center}
.footer-logo{display:inline-flex;align-items:center;justify-content:center;gap:10px;margin-bottom:14px}
.footer-logo img{height:40px;width:auto}
.footer-logo .brand-name{font-size:26px}
.footer-desc{color:var(--muted);font-size:13.5px;margin:0 auto 18px;max-width:820px}
.footer-links{margin:0 0 12px}
.footer-links a{display:inline-block;margin:0 6px 6px;color:var(--muted);font-size:13.5px}
.footer-links a+a:before{content:"";width:4px;height:4px;margin:0 .5em;border-radius:50%;display:inline-block;vertical-align:middle;background:#888;opacity:.3;vertical-align:.2em}
.footer-links a:hover{color:var(--brand)}
.footer-social{display:flex;gap:6px;justify-content:center}
.footer-social>a{position:relative;display:inline-block;margin:5px;width:35px;height:35px;line-height:35px;text-align:center;border-radius:50%;background:var(--bg);color:var(--muted)}
.footer-social>a:hover{color:var(--brand)}
.footer-copyright{margin-top:10px;color:var(--muted);font-size:12px;border-top:1px solid var(--line);padding-top:12px;text-align:left}
.footer-copyright a:hover{color:var(--brand)}

/* ── Bootstrap 风格小工具类（只取用到的）───────────────────────── */
.d-md-none{display:block}
.ml-3{margin-left:1rem}
.m-0{margin:0!important}
.mb-3{margin-bottom:1rem}
.mb-4{margin-bottom:1.5rem}
.my-4{margin-top:1.5rem;margin-bottom:1.5rem}
.pt-4{padding-top:1.5rem}
.pb-3{padding-bottom:1rem}
.text-center{text-align:center}
.text-md-left{text-align:left}
.text-md-right{text-align:right}
.rounded-circle{border-radius:50%}
.bg-light{background:var(--bg)}
.row{display:flex;flex-wrap:wrap;margin-right:-15px;margin-left:-15px}
.row>*{padding-right:15px;padding-left:15px}
.col-12{flex:0 0 100%;max-width:100%}
@media(min-width:768px){
  .d-md-none{display:none!important}
  .ml-md-4{margin-left:1.5rem}
  .col-md-3{flex:0 0 25%;max-width:25%}
  .col-md-4{flex:0 0 33.333333%;max-width:33.333333%}
  .col-md-5{flex:0 0 41.666667%;max-width:41.666667%}
  .text-md-left{text-align:left}
  .text-md-right{text-align:right}
}

/* ── 首页：顶栏透明浮在 hero 上 ───────────────────────────────── */
.home .page-header{position:absolute;background:none!important;box-shadow:none}
.io-black-mode .home .page-header{background:rgba(44,46,47,.7)!important}
@media(min-width:768px){.header-big{padding-top:80px}}

/* ── 悬浮工具 ─────────────────────────────────────────────────── */
#footer-tools{position:fixed;right:18px;bottom:26px;z-index:1082;gap:8px;display:flex;flex-direction:column}
#footer-tools .btn{width:42px;height:42px;border-radius:50%;background:var(--card);border:1px solid var(--line);color:var(--muted);display:inline-flex;align-items:center;justify-content:center;box-shadow:0 2px 10px rgba(30,38,60,.08);cursor:pointer}
#footer-tools .btn:hover{color:var(--brand);border-color:var(--brand)}
#go-to-up{display:none}