/* AI元技能 V2 · 纯净版样式：一套 CSS 覆盖首页 / 列表 / 详情 / 登录 */
:root{
  --top:#101a2b;
  --ink:#17212f;
  --ink-2:#40506a;
  --muted:#7b8798;
  --bg:#f6f8fb;
  --card:#fff;
  --line:#e4eaf2;
  --brand:#0a84ff;
  --brand-dark:#0066d6;
  --brand-soft:#e8f3ff;
  --accent:#ffd43b;
  --radius:14px;
  --shadow:0 2px 8px rgba(18,34,60,.05),0 12px 32px rgba(18,34,60,.07);
  --font:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Noto Sans SC","Segoe UI",Arial,sans-serif;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font:15px/1.75 var(--font)}
img{max-width:100%;display:block}
a{color:var(--brand-dark);text-decoration:none}
a:hover{color:var(--brand)}
h1,h2,h3{line-height:1.35;margin:0 0 .55em}
h1{font-size:30px;letter-spacing:.3px}
h2{font-size:21px}
h3{font-size:16px}
p{margin:0 0 .9em}
.wrap{max-width:1180px;margin:0 auto;padding:0 24px}
.block{margin:42px auto}
.center{text-align:center}
.muted{color:var(--muted);font-size:14px}
code{background:#f0f3f8;padding:1px 5px;border-radius:4px;font-size:12px;color:#37507a}

/* 顶栏 */
.top{position:sticky;top:0;z-index:30;background:var(--top);border-bottom:1px solid rgba(255,255,255,.08)}
.top-in{display:flex;align-items:center;gap:28px;height:64px}
.brand{display:flex;align-items:center;flex-shrink:0}
.brand img{height:34px;width:auto}
.nav{display:flex;gap:4px;align-items:center}
.nav a{color:#c3cede;padding:8px 14px;border-radius:8px;font-size:14px;white-space:nowrap}
.nav a:hover{background:rgba(255,255,255,.08);color:#fff}
.nav a.on{background:rgba(10,132,255,.18);color:#8ec5ff;font-weight:600}
.top-right{margin-left:auto;display:flex;align-items:center;gap:12px}
.hello{color:#c3cede;font-size:14px}

/* 按钮 / 标签 */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;height:42px;padding:0 20px;border-radius:10px;border:1px solid transparent;font:600 14px var(--font);cursor:pointer;white-space:nowrap;transition:background .15s,transform .05s,border-color .15s}
.btn:active{transform:translateY(1px)}
.btn-sm{height:34px;padding:0 14px;font-size:13px}
.btn-primary{background:var(--brand);color:#fff}
.btn-primary:hover{background:var(--brand-dark);color:#fff}
.btn-ghost{background:#fff;border-color:var(--line);color:var(--ink-2)}
.btn-ghost:hover{border-color:var(--brand);color:var(--brand-dark)}
.chips{display:flex;flex-wrap:wrap;gap:9px}
.chip{display:inline-flex;align-items:center;padding:5px 14px;border-radius:99px;background:#fff;border:1px solid var(--line);color:var(--ink-2);font-size:14px;line-height:1.6}
.chip:hover{border-color:var(--brand);color:var(--brand-dark)}
.chip.on{background:var(--brand);border-color:var(--brand);color:#fff}
.tag{display:inline-block;padding:2px 9px;margin:0 6px 6px 0;background:var(--brand-soft);color:#1a5fa8;border-radius:6px;font-size:12px}
.badge{display:inline-block;padding:3px 11px;border-radius:6px;background:var(--brand-soft);color:var(--brand-dark);font-size:13px;font-weight:600}
.eyebrow{display:inline-block;margin:0 0 12px;padding:3px 12px;border-radius:99px;background:rgba(255,212,59,.16);color:var(--accent);font-size:13px;letter-spacing:1px}

/* 首页 Hero */
.hero{position:relative;overflow:hidden;background:#0d182a;color:#fff}
.hero-bg{position:absolute;inset:0;background:url("hero.jpg") center center/cover no-repeat;opacity:.5}
.hero::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(9,19,35,.92) 0%,rgba(9,19,35,.72) 55%,rgba(9,19,35,.35) 100%)}
.hero-in{position:relative;z-index:1;padding-top:76px;padding-bottom:72px}
.hero h1{font-size:44px;line-height:1.28;margin-bottom:16px;letter-spacing:1px}
.hero-lead{max-width:680px;color:#d6e1f0;font-size:16px;margin-bottom:26px}
.hero-search{display:flex;max-width:620px;background:#fff;border-radius:12px;padding:5px;box-shadow:0 10px 30px rgba(0,0,0,.2)}
.hero-search input{flex:1;min-width:0;border:0;outline:0;background:transparent;font:15px var(--font);padding:0 14px;color:var(--ink)}
.hero-search button{border:0;background:var(--brand);color:#fff;border-radius:9px;padding:0 24px;font:600 15px var(--font);cursor:pointer;white-space:nowrap}
.hero-search button:hover{background:var(--brand-dark)}
.hero .chips{margin-top:22px}
.hero .chip{background:rgba(255,255,255,.1);border-color:rgba(255,255,255,.28);color:#e8f1ff}
.hero .chip:hover{background:rgba(255,255,255,.22);color:#fff}

/* 区块 */
.block-head{display:flex;align-items:baseline;justify-content:space-between;gap:16px;margin-bottom:18px}
.block-head h2{margin:0}
.block-head a{font-size:14px}
.page-head{padding-top:30px}
.page-head h1{margin-top:14px}
.page-lead{color:var(--ink-2);max-width:820px;margin-bottom:0}
.crumbs ol{display:flex;flex-wrap:wrap;gap:8px;list-style:none;margin:0;padding:0;font-size:13px;color:var(--muted)}
.crumbs li+li::before{content:"/";margin-right:8px;color:#c3ccd8}
.crumbs a{color:var(--muted)}
.crumbs a:hover{color:var(--brand-dark)}

/* 分类卡片 */
.cat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.cat-card{position:relative;display:block;height:190px;border-radius:var(--radius);overflow:hidden;background:#dde5ef;box-shadow:var(--shadow)}
.cat-card img{width:100%;height:100%;object-fit:cover;transition:transform .35s}
.cat-card:hover img{transform:scale(1.06)}
.cat-card::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(8,20,38,0) 25%,rgba(8,20,38,.88) 100%)}
.cat-card-body{position:absolute;z-index:1;left:18px;right:18px;bottom:16px;color:#fff}
.cat-card-body b{display:block;font-size:18px;margin-bottom:2px}
.cat-card-body span{display:block;font-size:12px;color:#d5e2f2;line-height:1.5;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}

/* 内容网格 */
.grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:transform .18s,box-shadow .18s}
.card:hover{transform:translateY(-3px);box-shadow:0 6px 14px rgba(18,34,60,.09),0 18px 38px rgba(18,34,60,.1)}
.card-media{position:relative;display:block;aspect-ratio:16/9;overflow:hidden;background:#e7edf5}
.card-media img{width:100%;height:100%;object-fit:cover;transition:transform .35s}
.card:hover .card-media img{transform:scale(1.05)}
.card-cat{position:absolute;left:10px;top:10px;padding:2px 9px;border-radius:6px;background:rgba(8,20,38,.68);color:#fff;font-size:12px}
.card-body{padding:14px 16px 16px}
.card-body h3{margin:0 0 8px;font-size:15px;line-height:1.5;min-height:46px}
.card-body h3 a{color:var(--ink)}
.card-body h3 a:hover{color:var(--brand-dark)}
.card-meta{margin:0 0 10px;color:var(--muted);font-size:12px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.card-tags{margin-bottom:-6px}
.empty{padding:56px 20px;text-align:center;background:#fff;border:1px dashed var(--line);border-radius:var(--radius);color:var(--muted)}
.empty b{display:block;color:var(--ink);font-size:18px;margin-bottom:8px}

/* CTA */
.cta{display:flex;align-items:center;justify-content:space-between;gap:24px;padding:28px 32px;border-radius:var(--radius);background:linear-gradient(100deg,#e8f3ff,#f4f9ff);border:1px solid #d6e8ff}
.cta h2{margin:0 0 6px;font-size:20px}
.cta p{margin:0;color:var(--ink-2);font-size:14px}

/* 列表筛选 / 分页 */
.filters{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:14px;margin-bottom:14px}
.list-search{display:flex;background:#fff;border:1px solid var(--line);border-radius:10px;padding:4px;min-width:280px}
.list-search input{flex:1;min-width:0;border:0;outline:0;background:transparent;padding:0 12px;font:14px var(--font);color:var(--ink)}
.list-search button{border:0;background:var(--brand);color:#fff;border-radius:7px;padding:0 16px;font:600 13px var(--font);cursor:pointer}
.result-count{color:var(--muted);font-size:13px;margin:0 0 16px}
.pager{display:flex;justify-content:center;gap:8px;margin-top:28px}
.pager-btn{min-width:38px;height:38px;line-height:36px;text-align:center;border:1px solid var(--line);border-radius:9px;background:#fff;color:var(--ink-2);font-size:14px}
.pager-btn:hover{border-color:var(--brand);color:var(--brand-dark)}
.pager-btn.on{background:var(--brand);border-color:var(--brand);color:#fff;font-weight:600}

/* 详情页 */
.detail{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:30px 32px;box-shadow:var(--shadow)}
.detail-head h1{font-size:28px;margin:12px 0 8px}
.detail-meta{color:var(--muted);font-size:13px;margin-bottom:24px}
/* 详情页 · 完整图展示：画框高度按横/方/竖自适应，图片 contain 居中，绝不裁切 */
.detail-figure{margin:0 0 26px}
.detail-stage{position:relative;display:flex;align-items:center;justify-content:center;width:100%;height:clamp(340px,58vh,620px);border:1px solid var(--line);border-radius:12px;overflow:hidden;background:#e9eef5}
.detail-stage[data-ratio="tall"]{height:clamp(460px,78vh,820px)}
.detail-stage[data-ratio="square"]{height:clamp(400px,68vh,720px)}
.stage-bg{position:absolute;inset:-40px;background:center center/cover no-repeat;filter:blur(34px) saturate(.8) brightness(.95);opacity:.55;transform:scale(1.08)}
.detail-stage::after{content:"";position:absolute;inset:0;background:rgba(244,247,251,.45);pointer-events:none}
.stage-photo{position:relative;z-index:1;display:block;width:auto;height:auto;max-width:100%;max-height:100%;object-fit:contain;cursor:zoom-in;background:#fff;box-shadow:0 10px 34px rgba(12,26,48,.2);border-radius:3px}
.stage-hint{position:absolute;z-index:2;bottom:12px;right:12px;padding:4px 10px;border-radius:99px;background:rgba(8,20,38,.62);color:#fff;font-size:12px;pointer-events:none}
.detail-figure figcaption{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:10px;margin-top:10px;color:var(--muted);font-size:12px}
.figure-actions{display:flex;gap:8px}
.figure-actions .btn{height:32px;padding:0 12px;font-size:12px}
.detail-body{max-width:860px;margin:0 auto}
.detail-section{margin-bottom:30px}
.detail-section h2{font-size:18px;padding-left:11px;border-left:4px solid var(--brand)}
.section-head{display:flex;align-items:center;justify-content:space-between;gap:12px}
.copyright{color:var(--muted);font-size:13px;background:var(--bg);padding:12px 14px;border-radius:8px}
.prompt{margin:0;padding:18px 20px;background:#0f1c2e;color:#d8e6f8;border-radius:10px;font:13px/1.9 "SFMono-Regular",Consolas,"Microsoft YaHei",monospace;white-space:pre-wrap;word-break:break-word;overflow-x:auto}
.detail-nav{display:flex;justify-content:space-between;gap:16px;border-top:1px solid var(--line);padding-top:18px;font-size:13px}
.detail-nav a{max-width:48%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}

/* 登录页 */
.login-wrap{max-width:520px;padding:52px 24px 70px}
.login-card{background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow);padding:34px 32px;text-align:center}
.login-card h1{font-size:22px;margin:0 0 8px}
.login-sub{color:var(--muted);font-size:14px;margin-bottom:22px}
.qr-box{width:252px;height:252px;margin:0 auto;padding:6px;border:1px solid var(--line);border-radius:12px;background:#fff}
.qr-box img{width:100%;height:100%;object-fit:contain}
.qr-placeholder{position:relative;width:252px;height:252px;margin:0 auto;border:1px dashed #c9d5e4;border-radius:12px;background:repeating-linear-gradient(45deg,#f7f9fc,#f7f9fc 10px,#f1f5fa 10px,#f1f5fa 20px)}
.qr-corner{position:absolute;width:34px;height:34px;border:5px solid var(--brand)}
.qr-corner.tl{top:24px;left:24px;border-right:0;border-bottom:0}
.qr-corner.tr{top:24px;right:24px;border-left:0;border-bottom:0}
.qr-corner.bl{bottom:24px;left:24px;border-right:0;border-top:0}
.qr-corner.br{bottom:24px;right:24px;border-left:0;border-top:0}
.qr-placeholder-text{position:absolute;inset:70px 20px;display:flex;flex-direction:column;justify-content:center;background:rgba(255,255,255,.92);border-radius:8px;color:var(--ink-2);font-weight:600}
.qr-placeholder-text small{color:var(--muted);font-weight:400}
.qr-state{margin:18px 0 2px;color:var(--brand-dark);font-size:15px;min-height:24px}
.qr-expire{margin:0;color:var(--muted);font-size:12px}
.login-notice{margin-top:18px;padding:14px 16px;background:#fff8e8;border:1px solid #f5dfae;border-radius:10px;color:#8a5b12;text-align:left;font-size:13px;line-height:1.8}
.login-ok{margin:22px 0;color:#198754;font-size:16px;font-weight:600}
.login-actions{display:flex;justify-content:center;gap:10px;margin-top:20px;flex-wrap:wrap}
.login-steps{display:flex;justify-content:center;gap:26px;list-style:none;margin:26px 0 14px;padding:0}
.login-steps li{display:flex;flex-direction:column;align-items:center;gap:4px;color:var(--ink-2);font-size:13px}
.login-steps b{color:var(--brand);font-size:15px}
.login-tip{text-align:center;color:var(--muted);font-size:12px;margin:0}

/* 页脚 */
.foot{margin-top:56px;background:#eef2f7;border-top:1px solid var(--line)}
.foot-in{display:flex;flex-wrap:wrap;gap:28px;justify-content:space-between;padding-top:30px;padding-bottom:30px;font-size:13px}
.foot-brand b{font-size:17px}
.foot-brand p{color:var(--muted);margin:4px 0 0}
.foot-links{display:flex;gap:18px;align-items:flex-start;flex-wrap:wrap}
.foot-meta{color:var(--muted);text-align:right}
.foot-meta p{margin:0 0 4px}

@media (max-width:1000px){
  .grid{grid-template-columns:repeat(3,1fr)}
  .cat-grid{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:760px){
  .wrap{padding:0 16px}
  .top-in{gap:12px;height:58px}
  .brand img{height:28px}
  .nav a{padding:6px 9px;font-size:13px}
  .hello{display:none}
  .hero-in{padding-top:52px;padding-bottom:52px}
  .hero h1{font-size:32px}
  .hero-lead{font-size:14px}
  .grid{grid-template-columns:repeat(2,1fr);gap:12px}
  .cat-grid{grid-template-columns:repeat(2,1fr)}
  .cat-card{height:150px}
  .detail{padding:20px 16px}
  .filters{flex-direction:column;align-items:stretch}
  .list-search{min-width:0}
  .cta{flex-direction:column;align-items:flex-start;padding:22px}
  .foot-meta{text-align:left}
}
@media (max-width:480px){
  .grid{grid-template-columns:1fr}
  .cat-grid{grid-template-columns:1fr}
  .hero-search button{padding:0 14px}
  .login-card{padding:26px 20px}
  .login-steps{gap:14px}
}

/* ---- 真实数据版新增：统计 / 分类 / 专题 / 标签 / 来源切换 ---- */
.section-lead{color:var(--muted);font-size:13px;margin:-6px 0 16px}
.stat-row{display:flex;flex-wrap:wrap;align-items:center;gap:22px;margin:22px 0 0;color:#cddcf0;font-size:13px}
.stat-row b{display:block;color:#fff;font-size:22px;line-height:1.3;letter-spacing:.5px}
.stat-row a{color:#8ec5ff;font-size:13px}

/* 15 类场景：5 列紧凑卡片 */
.cat-grid{grid-template-columns:repeat(5,1fr);gap:14px}
.cat-card{height:158px}
.cat-card-body b{font-size:16px}
.cat-count{position:absolute;z-index:1;top:10px;right:10px;padding:1px 8px;border-radius:99px;background:rgba(8,20,38,.72);color:#fff;font-size:11px}

/* 群友专题 */
.topic-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.topic-card{position:relative;display:block;height:132px;border-radius:12px;overflow:hidden;background:#dde5ef;box-shadow:var(--shadow)}
.topic-card img{width:100%;height:100%;object-fit:cover;transition:transform .35s}
.topic-card:hover img{transform:scale(1.06)}
.topic-card::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(8,20,38,0) 20%,rgba(8,20,38,.86) 100%)}
.topic-body{position:absolute;z-index:1;left:12px;right:12px;bottom:10px;color:#fff}
.topic-body b{display:block;font-size:14px;line-height:1.4;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.topic-body span{font-size:11px;color:#d5e2f2}

/* 标签云 */
.tag-cloud{display:flex;flex-wrap:wrap;gap:10px}
.tag-pill{display:inline-flex;align-items:center;gap:8px;padding:7px 13px;border-radius:9px;background:#fff;border:1px solid var(--line);color:var(--ink-2);font-size:13px;box-shadow:0 1px 3px rgba(18,34,60,.04)}
.tag-pill:hover{border-color:var(--brand);color:var(--brand-dark);transform:translateY(-1px)}
.tag-pill.zh{background:#f2f8ff;border-color:#d9e9fb;color:#1a5fa8}
.tag-pill em{font-style:normal;color:var(--muted);font-size:11px}

/* 来源切换与筛选 */
.source-tabs{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:18px;border-bottom:1px solid var(--line);padding-bottom:12px}
.source-tab{padding:7px 16px;border-radius:8px;color:var(--ink-2);font-size:14px;background:#fff;border:1px solid var(--line)}
.source-tab:hover{border-color:var(--brand);color:var(--brand-dark)}
.source-tab.on{background:var(--top);border-color:var(--top);color:#fff;font-weight:600}
.filter-label{color:var(--muted);font-size:12px;margin:0 0 8px;letter-spacing:.3px}
.list-search{margin:16px 0 0}
.active-filters{display:flex;flex-wrap:wrap;gap:10px;margin-top:14px}
.active-filters span{display:inline-flex;align-items:center;gap:6px;padding:4px 10px;border-radius:8px;background:var(--brand-soft);color:#1a5fa8;font-size:13px}
.active-filters a{font-size:16px;line-height:1;color:#1a5fa8}

/* 卡片来源角标 / 分页窗口 */
.card-src{position:absolute;right:10px;top:10px;padding:2px 8px;border-radius:6px;background:rgba(255,255,255,.9);color:#1a5fa8;font-size:11px;font-weight:600}
.pager-btn.wide{min-width:auto;padding:0 12px;font-size:13px}
.pager-btn.disabled{color:#b6c0ce;background:#f7f9fc;border-color:var(--line)}
.pager-gap{align-self:center;color:var(--muted);padding:0 2px}

/* 详情页补充 */
.detail-badges{display:flex;gap:8px;flex-wrap:wrap}
.badge-soft{background:#eef4fb;color:#3c618c}
/* 详情页 · 放大灯箱：适应窗口 / 1:1 原图两种视图 */
.lightbox{position:fixed;inset:0;z-index:100;display:flex;flex-direction:column;background:#0a1220;color:#eaf1fb}
.lightbox[hidden]{display:none}
body.lb-open{overflow:hidden}
.lb-bar{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;padding:10px 16px;border-bottom:1px solid rgba(255,255,255,.12);font-size:13px}
.lb-bar b{font-weight:600}
.lb-actions{display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.lb-actions button,.lb-actions a{display:inline-flex;align-items:center;height:32px;padding:0 12px;border:1px solid rgba(255,255,255,.22);border-radius:8px;background:transparent;color:#dce8f8;font:13px var(--font);cursor:pointer;text-decoration:none}
.lb-actions button:hover,.lb-actions a:hover{background:rgba(255,255,255,.12);color:#fff}
.lb-actions button.on{background:#0a84ff;border-color:#0a84ff;color:#fff}
.lb-canvas{flex:1;min-height:0;display:flex;align-items:center;justify-content:center;overflow:auto;padding:14px}
.lb-canvas img{display:block;width:auto;height:auto;max-width:100%;max-height:100%;object-fit:contain;margin:auto;box-shadow:0 10px 40px rgba(0,0,0,.45);background:#fff}
.lb-canvas.actual{align-items:flex-start;justify-content:flex-start}
.lb-canvas.actual img{max-width:none;max-height:none;margin:0;cursor:grab}
.lb-canvas.dragging img{cursor:grabbing}
.lb-tip{margin:0;padding:8px 16px 12px;text-align:center;color:#9fb0c6;font-size:12px}
@media (max-width:760px){
  .detail-stage{height:clamp(280px,52vh,480px)}
  .detail-stage[data-ratio="tall"]{height:clamp(380px,70vh,640px)}
  .detail-figure figcaption{flex-direction:column;align-items:flex-start}
  .lb-bar{font-size:12px}
  .lb-tip{font-size:11px}
}
.section-head.sub{margin-top:14px}
.section-head.sub h3{font-size:15px;margin:0;color:var(--ink-2);padding-left:0;border:0}
.prompt-sub{max-height:220px;overflow:auto;background:#182a42;font-size:12px}

/* 数据库未连接时的提示条 */
.demo-notice{padding:9px 24px;background:#fff8e8;border-bottom:1px solid #f5dfae;color:#8a5b12;font-size:12px;text-align:center}
.demo-notice code{background:#f7ecd2;color:#8a5b12}

@media (max-width:1000px){
  .cat-grid{grid-template-columns:repeat(3,1fr)}
  .topic-grid{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:760px){
  .cat-grid{grid-template-columns:repeat(2,1fr)}
  .cat-card{height:140px}
  .stat-row{gap:14px}
  .stat-row b{font-size:18px}
}
@media (max-width:480px){
  .cat-grid{grid-template-columns:repeat(2,1fr)}
  .topic-grid{grid-template-columns:1fr}
  .tag-pill{font-size:12px;padding:6px 10px}
  .source-tab{font-size:13px;padding:6px 12px}
}

/* 筛选页搜索框与上方标签区分得更清楚 */
.list-search{background:#fbfdff;border-color:#d9e3f0;box-shadow:0 1px 4px rgba(18,34,60,.05)}