/* ============================================================
   全领优AI 前端设计系统
   科技大气 AI 风格 · 深色底 · 电光紫/科技蓝 · 响应式 H5
   ============================================================ */
:root{
  --bg:#0a0e27;
  --bg-2:#0e1430;
  --panel:#121a3a;
  --panel-2:#16204a;
  --line:rgba(120,140,255,.16);
  --text:#e8ecff;
  /* 可读性：小字对比度提升（在深色底上达到更高对比比） */
  --muted:#b4bdec;
  --muted-strong:#cdd4f6;
  --brand:#5b6cff;
  --brand-2:#9b5bff;
  --cyan:#33e1ff;
  --grad:linear-gradient(120deg,#5b6cff 0%,#9b5bff 50%,#33e1ff 100%);
  --grad-soft:linear-gradient(120deg,rgba(91,108,255,.18),rgba(155,91,255,.12));
  --radius:16px;
  --shadow:0 18px 50px rgba(0,0,0,.45);
  --maxw:1320px;
  /* 可读性：中文优先字体栈（系统字体优先，离线可用，无需外链大字体） */
  --font-cn:"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei","Source Han Sans SC","Noto Sans SC","WenQuanYi Micro Hei","Hiragino Sans GB",sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:var(--font-cn);
  background:radial-gradient(1200px 700px at 80% -10%,rgba(91,108,255,.18),transparent 60%),
             radial-gradient(900px 600px at -10% 10%,rgba(155,91,255,.14),transparent 55%),
             var(--bg);
  color:var(--text);
  line-height:1.7;
  letter-spacing:.2px;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  text-rendering:optimizeLegibility;
  font-feature-settings:"kern" 1;
  overflow-x:hidden;
}
/* 标题字族与正文一致，保持中文笔画清晰 */
h1,h2,h3,h4,.section-title,.admin-title,.stat .n,.hero-stats .num{
  font-family:var(--font-cn);
  letter-spacing:.3px;
  text-wrap:balance;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.container{max-width:var(--maxw);margin:0 auto;padding:0 20px}
.grad-text{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;font-weight:800}
.muted{color:var(--muted)}
.section{padding:84px 0}
.section-title{font-size:34px;font-weight:800;margin-bottom:10px;letter-spacing:.5px}
.section-sub{color:var(--muted);margin-bottom:38px;font-size:16px}
.center{text-align:center}

/* 按钮 */
.btn{display:inline-flex;align-items:center;gap:8px;padding:13px 26px;border-radius:999px;font-weight:700;
  font-size:15px;cursor:pointer;border:1px solid transparent;transition:.25s;white-space:nowrap}
.btn-primary{background:var(--grad);color:#fff;box-shadow:0 10px 30px rgba(91,108,255,.4)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 16px 40px rgba(91,108,255,.55)}
.btn-ghost{border-color:var(--line);color:var(--text);background:rgba(255,255,255,.03)}
.btn-ghost:hover{border-color:var(--brand);background:rgba(91,108,255,.12)}
.btn-outline{border:1px solid rgba(91,108,255,.55);color:#fff;background:transparent;box-shadow:0 0 18px rgba(91,108,255,.12)}
.btn-outline:hover{border-color:rgba(91,108,255,.85);background:rgba(91,108,255,.10);box-shadow:0 0 24px rgba(91,108,255,.22)}

/* 顶栏 */
.header{position:sticky;top:0;z-index:50;-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);
  background:rgba(10,14,39,.72);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;height:68px}
.logo{display:flex;align-items:center;gap:10px;font-weight:900;font-size:20px;letter-spacing:.5px}
.logo-img{height:34px;width:auto;display:block}
.logo .dot{width:30px;height:30px;border-radius:9px;background:var(--grad);
  box-shadow:0 0 18px rgba(91,108,255,.7);position:relative}
.logo .dot::after{content:"";position:absolute;inset:7px;border-radius:5px;background:var(--bg)}
.nav-menu{display:flex;gap:6px;list-style:none;flex-wrap:wrap;align-items:center}
.nav-menu>li{position:relative}
.nav-menu a{padding:8px 13px;border-radius:10px;color:var(--muted);font-size:15px;font-weight:600;transition:.2s;display:inline-flex;align-items:center;gap:4px}
.nav-menu a:hover,.nav-menu a.active{color:#fff;background:rgba(91,108,255,.14)}
.nav-menu .arrow{font-size:10px;opacity:.7}
/* 下拉触发区向下延伸，覆盖到下拉菜单顶部，避免鼠标移入菜单过程中因间隙而消失。
   视觉间隙由 .dropdown 的 padding-top 实现，而非 top 偏移，确保鼠标全程停留在 hover 区域内。 */
.has-dropdown{padding-bottom:18px;margin-bottom:-18px}
.dropdown{display:none;position:absolute;top:100%;left:0;min-width:180px;background:rgba(10,14,39,.95);border:1px solid var(--line);border-radius:12px;padding:14px 8px 8px;box-shadow:0 20px 40px rgba(0,0,0,.35);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);z-index:60;list-style:none}
.has-dropdown.open>.dropdown{display:block;animation:fadeIn .2s ease}
.has-dropdown:hover>.dropdown,.has-dropdown:focus-within>.dropdown{display:block;animation:fadeIn .2s ease}
.dropdown li{margin:2px 0}
.dropdown a{display:block;padding:9px 14px;border-radius:8px;white-space:nowrap}
@keyframes fadeIn{from{opacity:0;transform:translateY(-6px)}to{opacity:1;transform:translateY(0)}}
.nav-right{display:flex;align-items:center;gap:12px}
.lang-switch{display:flex;border:1px solid var(--line);border-radius:999px;overflow:hidden;font-size:13px}
.lang-switch a{padding:6px 12px;color:var(--muted)}
.lang-switch a.active{background:var(--grad);color:#fff}
.menu-toggle{display:none;flex-direction:column;gap:5px;cursor:pointer;padding:8px}
.menu-toggle span{width:24px;height:2px;background:var(--text);border-radius:2px}

/* Hero */
.hero{position:relative;padding:90px 0 70px;overflow:hidden}
.hero-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:40px;align-items:center}
/* 业务/Hero 分栏：内联 grid 无法被媒体查询覆盖，统一用类，确保手机端塌成单列 */
.hero-split{display:grid;grid-template-columns:1.1fr .9fr;gap:40px;align-items:center}
@media (max-width:980px){.hero-split{grid-template-columns:1fr}}
.hero h1{font-size:46px;line-height:1.18;font-weight:900;margin-bottom:18px}
.hero p.lead{font-size:18px;color:var(--muted);margin-bottom:28px;max-width:560px}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap}
.hero-stats{display:flex;gap:30px;margin-top:40px;flex-wrap:wrap}
.hero-stats .num{font-size:30px;font-weight:900}
.hero-stats .lbl{color:var(--muted);font-size:13px}
.hero-visual{position:relative;height:360px;border-radius:24px;
  background:var(--grad-soft);border:1px solid var(--line);overflow:hidden;box-shadow:var(--shadow)}
.orb{position:absolute;border-radius:50%;filter:blur(8px);animation:float 7s ease-in-out infinite;transform-origin:center}
.orb.a{width:160px;height:160px;background:radial-gradient(circle,#5b6cff,transparent 70%);top:40px;left:50px}
.orb.b{width:120px;height:120px;background:radial-gradient(circle,#9b5bff,transparent 70%);bottom:50px;right:60px;animation-delay:1.5s}
.orb.c{width:90px;height:90px;background:radial-gradient(circle,#33e1ff,transparent 70%);top:120px;right:120px;animation-delay:3s}
/* 进阶交互：更立体的 Hero 光球浮动（位移 + 缩放 + 轻微旋转） */
@keyframes float{
  0%,100%{transform:translate3d(0,0,0) scale(1) rotate(0deg)}
  33%{transform:translate3d(14px,-26px,0) scale(1.06) rotate(6deg)}
  66%{transform:translate3d(-10px,-12px,0) scale(.97) rotate(-5deg)}
}
/* 首屏入场动画 */
.hero h1{animation:heroIn .8s cubic-bezier(.2,.7,.2,1) both}
.hero .lead{animation:heroIn .8s .12s cubic-bezier(.2,.7,.2,1) both}
.hero-cta{animation:heroIn .8s .24s cubic-bezier(.2,.7,.2,1) both}
.hero-stats{animation:heroIn .8s .36s cubic-bezier(.2,.7,.2,1) both}
.hero-visual{animation:heroVisualIn 1s .2s cubic-bezier(.2,.7,.2,1) both}
@keyframes heroIn{from{opacity:0;transform:translateY(26px)}to{opacity:1;transform:none}}
@keyframes heroVisualIn{from{opacity:0;transform:translateY(30px) scale(.97)}to{opacity:1;transform:none}}
@media (prefers-reduced-motion: reduce){
  .orb,.hero h1,.hero .lead,.hero-cta,.hero-stats,.hero-visual{animation:none!important}
}
.grid-lines{position:absolute;inset:0;background-image:linear-gradient(var(--line) 1px,transparent 1px),
  linear-gradient(90deg,var(--line) 1px,transparent 1px);background-size:40px 40px;opacity:.4}
/* 多张轮播自动切换 */
.hero-carousel{position:absolute;inset:0}
.hero-slide{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:0;transition:opacity .6s ease}
.hero-slide.active{opacity:1}
.hero-dots{position:absolute;left:0;right:0;bottom:14px;display:flex;justify-content:center;gap:8px;z-index:3}
.hero-dots .dot{width:8px;height:8px;border-radius:50%;background:rgba(255,255,255,.4);cursor:pointer;transition:background .3s,width .3s}
.hero-dots .dot.active{background:#fff;width:22px;border-radius:4px}
/* 进阶交互：轮播进度条（由 main.js 驱动 width 0→100%） */
.hero-progress{position:absolute;left:0;bottom:0;height:3px;width:0;z-index:4;
  background:var(--grad);box-shadow:0 0 12px rgba(91,108,255,.7);border-radius:0 3px 3px 0}

/* 卡片 */
.card{background:linear-gradient(180deg,var(--panel),var(--panel-2));border:1px solid var(--line);
  border-radius:var(--radius);padding:28px;transition:.25s;position:relative;overflow:hidden}
.card:hover{transform:translateY(-6px);border-color:rgba(91,108,255,.5);box-shadow:var(--shadow)}
.card .ic{width:52px;height:52px;border-radius:14px;background:var(--grad-soft);display:flex;
  align-items:center;justify-content:center;font-size:24px;margin-bottom:16px;border:1px solid var(--line)}
.card h3{font-size:20px;margin-bottom:10px}
.card p{color:var(--muted);font-size:15px}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:22px}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}

.tag{display:inline-block;padding:4px 12px;border-radius:999px;background:rgba(91,108,255,.14);
  color:#cdd6ff;font-size:12.5px;margin:0 6px 6px 0;border:1px solid var(--line)}

/* 业务块 */
.biz{padding:60px 0;border-top:1px solid var(--line)}
.biz:first-of-type{border-top:none}
.biz-grid{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center}
.biz.alt .biz-grid{direction:rtl}
.biz.alt .biz-grid>*{direction:ltr}
.biz h2{font-size:30px;margin-bottom:14px}
.biz .lead{color:var(--muted);margin-bottom:20px}
.feature-list{list-style:none;display:grid;gap:12px}
.feature-list li{display:flex;gap:12px;align-items:flex-start}
.feature-list .ck{width:22px;height:22px;border-radius:7px;background:var(--grad);flex:0 0 auto;
  display:flex;align-items:center;justify-content:center;font-size:13px;color:#fff;margin-top:3px}
.biz-visual{height:320px;border-radius:20px;background:var(--grad-soft);border:1px solid var(--line);
  position:relative;overflow:hidden}

/* 文章 */
.article-card{display:flex;flex-direction:column;gap:12px}
.article-card .cover{height:170px;border-radius:12px;background:var(--grad-soft);border:1px solid var(--line);overflow:hidden}
.article-card h3{font-size:18px;line-height:1.4}
.article-card .meta{color:var(--muted);font-size:13px;display:flex;gap:14px}
.article-list{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.art-detail{max-width:820px;margin:0 auto}
.art-detail .cover{height:360px;border-radius:18px;background:var(--grad-soft);
  border:1px solid var(--line);margin:24px 0}
.art-detail .content{font-size:16.5px;color:#d7ddff;line-height:1.9}
.art-detail .content h2,.art-detail .content h3{margin:26px 0 12px;color:#fff}
.art-detail .content p{margin-bottom:16px}
.art-detail .content img{max-width:100%;border-radius:12px;margin:14px 0}
.art-detail .content pre{background:#0b1130;border:1px solid var(--line);padding:16px;border-radius:12px;overflow:auto;color:#cfe}
.art-detail .content table{width:100%;border-collapse:collapse;margin:16px 0;font-size:14px}
.art-detail .content th,.art-detail .content td{border:1px solid var(--line);padding:8px 12px;text-align:left;word-break:break-word}
.art-detail .content th{background:var(--panel);color:#fff}
.article-summary{margin:24px 0;padding:22px 26px;background:linear-gradient(135deg,rgba(91,108,255,.10),rgba(51,225,255,.06));border:1px solid rgba(91,108,255,.22);border-radius:var(--radius)}
.article-summary .summary-label{font-size:13px;font-weight:800;color:var(--cyan);letter-spacing:1px;text-transform:uppercase;margin-bottom:10px}
.article-summary p{color:var(--muted);font-size:15px;line-height:1.85;margin:0}
/* 答案优先（answer-first）要点块：AI 可直接引用，真人阅读也更聚焦 */
.answer-first{border-left:4px solid var(--cyan);box-shadow:var(--shadow)}

/* 内容中心列表 */
.article-list-row{display:grid;gap:16px}
.article-item{display:grid;grid-template-columns:200px 1fr;gap:22px;align-items:center;padding:20px 22px;border-radius:var(--radius);background:var(--panel);border:1px solid var(--line);transition:.18s}
.article-item:hover{background:rgba(91,108,255,.08);border-color:rgba(91,108,255,.45);transform:translateY(-2px)}
.item-cover{height:130px;border-radius:12px;background:var(--grad-soft);overflow:hidden;border:1px solid var(--line)}
.item-cover img{width:100%;height:100%;object-fit:cover}
.item-cover-placeholder{width:100%;height:100%;background:linear-gradient(135deg,rgba(91,108,255,.18),rgba(155,91,255,.12))}
.item-body{min-width:0}
.item-meta{display:flex;align-items:center;gap:14px;flex-wrap:wrap;color:var(--muted);font-size:13px;margin-bottom:10px}
.item-category{padding:3px 10px;border-radius:20px;background:rgba(91,108,255,.14);color:var(--brand);font-size:12px;font-weight:600}
.article-item h3{font-size:19px;line-height:1.4;margin-bottom:10px;color:#fff;transition:.2s}
.article-item:hover h3{color:var(--cyan)}
.article-item p{color:var(--muted);font-size:14.5px;line-height:1.7;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}

/* 分页 */
.pagination-wrap{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:16px;margin-top:38px;padding-top:22px;border-top:1px solid var(--line)}
.pagination-stats{color:var(--muted);font-size:14px}
.pagination-nav{display:flex;align-items:center}
.pagination-nav .pagination{display:flex;gap:8px;list-style:none;margin:0;padding:0}
.pagination-nav .pagination li{list-style:none}
.pagination-nav .pagination li a,.pagination-nav .pagination li span{display:inline-flex;align-items:center;justify-content:center;min-width:38px;height:38px;padding:0 12px;border-radius:10px;background:var(--panel);border:1px solid var(--line);color:var(--text);font-size:14px;transition:.18s}
.pagination-nav .pagination li a:hover{background:rgba(91,108,255,.14);border-color:var(--brand);color:#fff}
.pagination-nav .pagination li.active span{background:var(--brand);border-color:var(--brand);color:#fff;font-weight:700}
.pagination-nav .pagination li.disabled span{opacity:.45;cursor:not-allowed}
.breadcrumb{color:var(--muted);font-size:14px;margin-bottom:8px}
.breadcrumb a:hover{color:var(--brand)}

/* 表单 */
.form{display:grid;gap:16px;max-width:560px}
.form label{font-size:14px;color:var(--muted);display:block;margin-bottom:6px}
.form input,.form textarea,.form select{width:100%;padding:13px 16px;border-radius:12px;
  background:var(--panel);border:1px solid var(--line);color:var(--text);font-size:15px;outline:none;transition:.2s}
.form input:focus,.form textarea:focus{border-color:var(--brand);box-shadow:0 0 0 3px rgba(91,108,255,.18)}
.form textarea{resize:vertical;min-height:120px}
.alert{padding:12px 16px;border-radius:12px;margin-bottom:14px;font-size:14px}
.alert-ok{background:rgba(51,225,170,.14);border:1px solid rgba(51,225,170,.4);color:#7af0c0}
.alert-err{background:rgba(255,99,132,.14);border:1px solid rgba(255,99,132,.4);color:#ff9bb0}

/* 页脚 */
.footer{border-top:1px solid var(--line);background:rgba(8,11,30,.7);padding:56px 0 26px;margin-top:40px}
.footer-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}
.footer h4{font-size:15px;margin-bottom:16px;color:#fff}
.footer ul{list-style:none;display:grid;gap:10px}
.footer ul a,.footer ul li{color:var(--muted-strong);font-size:14.5px}
.footer ul a:hover{color:var(--brand)}
.footer .about{color:var(--muted);font-size:14px;margin:14px 0}
.footer-about{padding-left:0;text-indent:0;max-width:12em}
.footer-bottom{border-top:1px solid var(--line);margin-top:36px;padding-top:22px;
  display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px;color:var(--muted-strong);font-size:13.5px}
.footer-bottom a{color:var(--muted)}
.footer-bottom a:hover{color:var(--brand)}
.badge{display:inline-flex;align-items:center;gap:6px;padding:5px 12px;border:1px solid var(--line);
  border-radius:8px;background:rgba(255,255,255,.03);font-size:12.5px;color:var(--muted);margin-right:8px}
.badge:hover{color:#fff;border-color:var(--brand)}

/* 响应式 H5 */
@media (max-width:980px){
  .hero-grid{grid-template-columns:1fr}
  .hero-visual{height:240px;order:-1}
  .biz-grid{grid-template-columns:1fr;gap:26px}
  .biz.alt .biz-grid{direction:ltr}
  .grid-3,.grid-4,.article-list{grid-template-columns:repeat(2,1fr)}
  .article-item{grid-template-columns:150px 1fr;gap:18px;padding:16px 18px}
  .item-cover{height:110px}
  .article-item h3{font-size:17px}
  .footer-grid{grid-template-columns:1fr 1fr}
  .section{padding:60px 0}
  .hero h1{font-size:34px}
}
@media (max-width:640px){
  .nav-menu{display:none}
  .menu-toggle{display:flex}
  .nav-menu.open{display:flex;position:absolute;top:68px;left:0;right:0;flex-direction:column;
    background:var(--bg-2);padding:14px 20px;border-bottom:1px solid var(--line);gap:4px}
  .nav-menu.open>li{width:100%}
  .nav-menu.open a{padding:12px 8px;width:100%}
  .dropdown{display:none;position:static;width:100%;background:transparent;border:none;box-shadow:none;padding-left:14px;margin:0}
  .has-dropdown.open>.dropdown{display:block;animation:none}
  .hero h1{font-size:30px;line-height:1.25}
  .section-title{font-size:24px}
  .art-detail .cover{height:200px}
  .dropdown a{padding:10px 12px;color:var(--muted)}
  .grid-2,.grid-3,.grid-4,.article-list{grid-template-columns:1fr}
  .article-item{grid-template-columns:1fr;gap:14px;padding:16px}
  .item-cover{height:160px}
  .article-item h3{font-size:17px}
  .pagination-wrap{flex-direction:column;align-items:flex-start}
  .footer-grid{grid-template-columns:1fr}
  .section-title{font-size:26px}
  .hero h1{font-size:28px}
  .section{padding:48px 0}
  .hero{padding:54px 0 40px}
  .footer-bottom{flex-direction:column}
}

/* ===================== 后台管理 ===================== */
.admin-body{display:grid;grid-template-columns:230px 1fr;min-height:100vh;background:var(--bg)}
.admin-side{background:var(--bg-2);border-right:1px solid var(--line);padding:20px 14px}
.admin-side .brand{display:flex;align-items:center;gap:10px;font-weight:900;font-size:18px;margin-bottom:24px;padding:0 6px}
.admin-side .brand .dot{width:26px;height:26px;border-radius:8px;background:var(--grad)}
.admin-menu{list-style:none;display:grid;gap:4px}
.admin-menu a{display:block;padding:11px 14px;border-radius:10px;color:var(--muted);font-weight:600;font-size:14.5px;transition:.2s}
.admin-menu a:hover,.admin-menu a.active{background:rgba(91,108,255,.16);color:#fff}
.admin-main{display:flex;flex-direction:column}
.admin-top{height:60px;display:flex;align-items:center;justify-content:space-between;padding:0 24px;border-bottom:1px solid var(--line);background:rgba(14,20,48,.6)}
.admin-top .who{color:var(--muted);font-size:14px}
.admin-content{padding:26px 24px;flex:1}
.admin-title{font-size:24px;font-weight:800;margin-bottom:18px}
.stat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-bottom:28px}
.stat{background:linear-gradient(180deg,var(--panel),var(--panel-2));border:1px solid var(--line);border-radius:14px;padding:18px}
.stat .n{font-size:28px;font-weight:900}
.stat .l{color:var(--muted);font-size:13px;margin-top:4px}
.table{width:100%;border-collapse:collapse;background:var(--panel);border:1px solid var(--line);border-radius:12px;overflow:hidden}
.table th,.table td{padding:12px 14px;text-align:left;font-size:14px;border-bottom:1px solid var(--line)}
.table th{background:var(--panel-2);color:var(--muted);font-weight:700}
.table tr:last-child td{border-bottom:none}
.table a{color:var(--brand)}
.badge-ok{color:#7af0c0}.badge-err{color:#ff9bb0}
.admin-form{max-width:760px;display:grid;gap:16px}
.admin-form label{font-size:13px;color:var(--muted);display:block;margin-bottom:6px}
.admin-form input,.admin-form textarea,.admin-form select{width:100%;padding:11px 14px;border-radius:10px;background:var(--panel);border:1px solid var(--line);color:var(--text);font-size:14px;outline:none}
.admin-form textarea{resize:vertical;min-height:200px;font-family:inherit}
.admin-form .row{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.pager{margin-top:18px;display:flex;gap:8px;flex-wrap:wrap}
.pager a,.pager span{padding:7px 13px;border-radius:8px;border:1px solid var(--line);color:var(--muted);font-size:13px}
.pager .active{background:var(--grad);color:#fff;border-color:transparent}
.login-wrap{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:20px}
.login-card{width:380px;max-width:100%;background:linear-gradient(180deg,var(--panel),var(--panel-2));border:1px solid var(--line);border-radius:18px;padding:34px;box-shadow:var(--shadow)}
.login-card h2{font-size:22px;margin-bottom:6px}
.login-card .sub{color:var(--muted);font-size:13px;margin-bottom:22px}
.login-card label{font-size:13px;color:var(--muted);display:block;margin:12px 0 6px}
.login-card input{width:100%;padding:12px 14px;border-radius:10px;background:var(--panel);border:1px solid var(--line);color:var(--text);font-size:15px;outline:none}
.captcha-img{cursor:pointer;margin-top:8px;border-radius:8px}
@media (max-width:880px){
  .admin-body{grid-template-columns:1fr}
  .admin-side{display:none}
  .stat-grid{grid-template-columns:repeat(2,1fr)}
  .admin-form .row{grid-template-columns:1fr}
}

/* ===================== 数据大屏 Dashboard ===================== */
.panel{background:linear-gradient(180deg,var(--panel),var(--panel-2));border:1px solid var(--line);border-radius:16px;padding:22px}
.panel-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px}
.panel-head h3{font-size:18px;font-weight:800}
.stat-grid.four{grid-template-columns:repeat(4,1fr)}
.stat-grid.two{grid-template-columns:repeat(2,1fr)}
.stat.mini{padding:16px}
.stat.mini .n{font-size:24px}
.stat.mini .l{font-size:12px}
.stat.card-seo .meta{margin-top:10px;display:flex;align-items:center;gap:10px;flex-wrap:wrap;font-size:12px}
.chart-title{font-size:14px;font-weight:700;color:var(--muted);margin-bottom:10px}
.chart-wrap{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:14px}
.table.compact th,.table.compact td{padding:9px 12px;font-size:13px}
.ellipsis{max-width:260px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
@media (max-width:880px){
  .stat-grid.four,.stat-grid.two{grid-template-columns:1fr}
  .ellipsis{max-width:160px}
}

/* ===================== 业务差异化视觉 ===================== */
.biz-card{overflow:hidden}
.biz-cover{height:160px;margin:-28px -28px 16px;overflow:hidden;background:var(--grad-soft);border-bottom:1px solid var(--line)}
.biz-cover img{width:100%;height:100%;object-fit:cover}
.biz-cover-full{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;z-index:2}
/* 特性/流程/案例/课程卡片中的真实封面 */
.card .cover img{width:100%;height:100%;object-fit:cover}
/* 文章卡片：统一封面高度 + 品牌紫主题色底边 */
.article-card .cover{height:190px;background:var(--grad-soft);overflow:hidden}
.article-card{border-bottom:3px solid #7c5cff}
/* 案例/课程卡片：在业务页内沿用该页 --biz-color 主题色底边（agent蓝/skill紫/edu绿…） */
.biz-page .case-card,
.biz-page .course-card{border-bottom:3px solid var(--biz-color)}
/* 业务页主题色：标题左侧色条 + 标签随主题色变化（--biz-color 由模板在顶层 section 注入） */
.biz-page{--biz-color:var(--brand)}
.biz-page .section-title{position:relative;padding-left:18px}
.biz-page .section-title::before{content:"";position:absolute;left:0;top:6px;bottom:6px;width:5px;border-radius:3px;background:var(--biz-color)}
.biz-page .tag{background:color-mix(in srgb,var(--biz-color) 16%,transparent);color:var(--biz-color)}
.biz-page .biz-visual{background:linear-gradient(135deg,color-mix(in srgb,var(--biz-color) 26%,var(--panel)),var(--grad-soft))}
.biz-page .biz-grid h1.section-title{padding-left:0}
.biz-page .biz-grid h1.section-title::before{display:none}

/* ===================== 社会证明（首页模块） ===================== */
.logo-wall{display:grid;grid-template-columns:repeat(6,1fr);gap:16px;margin-top:34px}
.logo-item{display:flex;align-items:center;justify-content:center;min-height:78px;padding:14px 18px;border:1px solid var(--line);
  border-radius:14px;background:linear-gradient(180deg,var(--panel),var(--panel-2));color:var(--muted-strong);
  font-weight:700;font-size:15px;text-align:center;letter-spacing:.5px;transition:.25s}
.logo-item:hover{border-color:rgba(91,108,255,.5);color:#fff;transform:translateY(-3px)}
.logo-item img{max-height:46px;max-width:100%;width:auto;object-fit:contain;filter:brightness(1.05)}
.testimonial .quote{font-size:15.5px;color:#d7ddff;line-height:1.8;margin-bottom:18px;position:relative;padding-left:18px}
.testimonial .quote::before{content:"“";position:absolute;left:-4px;top:-8px;font-size:40px;color:var(--brand);opacity:.5;font-family:Georgia,serif}
.testimonial .who{display:flex;align-items:center;gap:12px}
.testimonial .avatar{width:44px;height:44px;border-radius:50%;background:var(--grad-soft);border:1px solid var(--line);
  display:flex;align-items:center;justify-content:center;font-weight:800;color:var(--brand-2);overflow:hidden;flex:0 0 auto}
.testimonial .avatar img{width:100%;height:100%;object-fit:cover}
.cred-row{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:40px}
.cred{display:flex;align-items:center;gap:12px;padding:16px 18px;border:1px solid var(--line);border-radius:14px;
  background:rgba(255,255,255,.03);transition:.25s}
.cred:hover{border-color:rgba(91,108,255,.5);background:rgba(91,108,255,.08)}
.cred-ic{font-size:26px;line-height:1;flex:0 0 auto}
.cred b{font-size:15px}
@media (max-width:980px){
  .logo-wall{grid-template-columns:repeat(3,1fr)}
  .cred-row{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:640px){
  .logo-wall{grid-template-columns:repeat(2,1fr)}
  .cred-row{grid-template-columns:1fr}
}

/* ===================== 进阶交互：滚动揭示 ===================== */
/* 仅在启用 JS 时隐藏初始态，保证无脚本环境下内容完整可见 */
.js .reveal{opacity:0;transform:translateY(28px);
  transition:opacity .7s cubic-bezier(.2,.7,.2,1),transform .7s cubic-bezier(.2,.7,.2,1)}
.js .reveal.in{opacity:1;transform:none}
/* 卡片仅淡入：不与 hover 的 transform 冲突 */
.js .reveal-fade{opacity:0;transition:opacity .8s ease}
.js .reveal-fade.in{opacity:1}
@media (prefers-reduced-motion: reduce){
  .js .reveal,.js .reveal-fade{opacity:1!important;transform:none!important;transition:none!important}
}

/* ===================== 后台：版本管理 ===================== */
.page-header{margin-bottom:22px}
.page-header h1{font-size:24px;font-weight:800;margin-bottom:6px}
.page-header .muted{font-size:14px;color:var(--muted)}
.version-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.version-grid .card:hover{transform:none;border-color:var(--line);box-shadow:none}
.version-grid .card-title{font-size:14px;color:var(--muted);margin-bottom:10px;font-weight:600}
.version-current{font-size:32px;font-weight:900;color:var(--brand)}
.version-backup{font-size:26px;font-weight:800;color:#7af0c0}
.form-grid{display:grid;gap:16px;max-width:800px}
.form-row{display:grid;grid-template-columns:140px 1fr;gap:16px;align-items:start}
.form-row>label{font-size:13px;color:var(--muted);padding-top:10px;font-weight:600}
.form-row input[type="text"],
.form-row input[type="file"],
.form-row textarea{width:100%;padding:11px 14px;border-radius:10px;background:var(--panel);border:1px solid var(--line);color:var(--text);font-size:14px;outline:none}
.form-row textarea{resize:vertical;min-height:80px;font-family:inherit}
.radio-group{display:grid;gap:10px;padding-top:8px}
.radio-group label{display:flex;align-items:center;gap:8px;cursor:pointer;color:var(--text);font-weight:500}
.radio-group input[type="radio"]{width:18px;height:18px;accent-color:var(--brand)}
.help-text{font-size:12px;color:var(--muted);margin-top:6px}
.btn-danger{background:linear-gradient(180deg,#ff5b7a,#d92b4e);color:#fff;border:none;border-radius:10px;padding:11px 20px;font-weight:700;cursor:pointer;transition:.2s}
.btn-danger:hover{opacity:.9;transform:translateY(-1px)}
.btn-danger:disabled{background:#5a2a35;color:var(--muted);cursor:not-allowed;transform:none;opacity:.6}
.status-badge{display:inline-block;padding:4px 10px;border-radius:999px;font-size:12px;font-weight:600}
.status-1{background:rgba(122,240,192,.14);color:#7af0c0}
.status-2{background:rgba(255,91,122,.14);color:#ff8fa3}
.status-3{background:rgba(255,193,77,.14);color:#ffd17a}
.data-table{width:100%;border-collapse:collapse;background:var(--panel);border:1px solid var(--line);border-radius:12px;overflow:hidden;margin-top:14px}
.data-table th,.data-table td{padding:12px 14px;text-align:left;font-size:13px;border-bottom:1px solid var(--line)}
.data-table th{background:var(--panel-2);color:var(--muted);font-weight:700}
.data-table tr:last-child td{border-bottom:none}
.data-table td{vertical-align:top}
@media (max-width:880px){
  .version-grid{grid-template-columns:1fr}
  .form-row{grid-template-columns:1fr}
  .form-row>label{padding-top:0}
}