/*
Theme Name: AI Visibility Engine Hub
Theme URI: https://citetitan.com
Author: Sage Titans
Description: Lightweight custom theme for the AI Visibility Engine Knowledge Hub, matching the marketing site design.
Version: 1.0
License: Proprietary
Text Domain: aive-hub
*/

@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;600;700&family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

:root{
  --bg:#FCFCFD; --surface:#FFFFFF; --ink-panel:#0B1220;
  --text:#0B1220; --text-2:#3A4658; --muted:#5A6472; --muted-2:#8A94A6;
  --on-dark:#EAF0F7; --on-dark-muted:#8B97A8;
  --blue:#1488c4; --blue-bright:#23a9e1; --green:#00B87A; --green-bright:#00E599;
  --line:#E7ECF3; --line-2:#DCE3EC; --line-dark:rgba(255,255,255,.08);
  --display:'Space Grotesk',sans-serif; --body:'Inter',sans-serif; --mono:'JetBrains Mono',monospace;
  --max:1200px; --gutter:56px; --radius:14px; --content:760px;
}
*{box-sizing:border-box;margin:0;padding:0;}
html{scroll-behavior:smooth;}
body{font-family:var(--body);background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased;line-height:1.7;}
a{color:var(--blue);text-decoration:none;}
a:hover{text-decoration:underline;}
img{max-width:100%;height:auto;display:block;}
.container{max-width:var(--max);margin:0 auto;padding:0 var(--gutter);}

/* ---------- header (mirrors marketing site) ---------- */
.site-header{position:sticky;top:0;z-index:50;background:rgba(252,252,253,.82);backdrop-filter:saturate(180%) blur(12px);-webkit-backdrop-filter:saturate(180%) blur(12px);border-bottom:1px solid var(--line);}
.site-header .bar{display:flex;align-items:center;justify-content:space-between;height:68px;}
.brand{display:flex;align-items:center;gap:11px;}
.brand:hover{text-decoration:none;}
.brand-mark{width:32px;height:32px;border-radius:9px;background:linear-gradient(135deg,var(--green-bright),var(--blue-bright));display:flex;align-items:center;justify-content:center;color:#041427;font-weight:800;font-size:16px;flex-shrink:0;}
.brand-name{font-family:var(--display);font-weight:700;font-size:15.5px;letter-spacing:-.2px;color:var(--text);line-height:1.1;}
.brand-name small{display:block;font-family:var(--body);font-size:9.5px;font-weight:500;letter-spacing:1.3px;text-transform:uppercase;color:var(--muted-2);}
.nav{display:flex;align-items:center;gap:34px;}
.nav a{font-size:14.5px;font-weight:500;color:var(--text-2);}
.nav a:hover{color:var(--text);text-decoration:none;}
.nav-cta{display:flex;align-items:center;gap:14px;}
.nav-signin{font-size:14.5px;font-weight:600;color:var(--text);}
.btn{display:inline-flex;align-items:center;gap:9px;font-family:var(--body);font-weight:600;font-size:15px;border-radius:11px;cursor:pointer;border:none;text-decoration:none;transition:transform .15s,box-shadow .15s;}
.btn:hover{text-decoration:none;}
.btn-primary{background:var(--green);color:#fff;padding:11px 20px;box-shadow:0 6px 20px rgba(0,184,122,.28);}
.btn-primary:hover{transform:translateY(-2px);}

/* ---------- hub hero ---------- */
.hub-hero{padding:64px 0 40px;border-bottom:1px solid var(--line);}
.hub-hero .eyebrow{display:inline-flex;align-items:center;gap:8px;font-family:var(--mono);font-size:12px;font-weight:500;letter-spacing:.4px;color:var(--blue);border:1px solid rgba(20,136,196,.25);background:rgba(20,136,196,.06);padding:6px 13px;border-radius:100px;margin-bottom:20px;}
.hub-hero h1{font-family:var(--display);font-weight:700;font-size:42px;letter-spacing:-1.4px;line-height:1.1;margin-bottom:14px;max-width:16ch;}
.hub-hero p{font-size:17px;color:var(--muted);max-width:560px;}

/* ---------- post list ---------- */
.hub-main{padding:56px 0 80px;}
.post-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:30px;}
.post-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;display:flex;flex-direction:column;transition:transform .2s,box-shadow .2s;}
.post-card:hover{transform:translateY(-3px);box-shadow:0 16px 40px rgba(11,18,32,.08);}
.post-card a{text-decoration:none;color:inherit;}
.post-thumb{aspect-ratio:16/9;background:linear-gradient(135deg,#eef4fb,#e6f0f8);overflow:hidden;}
.post-thumb img{width:100%;height:100%;object-fit:cover;}
.post-body{padding:24px;display:flex;flex-direction:column;flex:1;}
.post-cat{font-family:var(--mono);font-size:11px;font-weight:500;letter-spacing:.5px;text-transform:uppercase;color:var(--blue);margin-bottom:10px;}
.post-title{font-family:var(--display);font-size:20px;font-weight:600;line-height:1.25;margin-bottom:10px;color:var(--text);}
.post-excerpt{font-size:14.5px;color:var(--muted);line-height:1.6;flex:1;}
.post-meta{margin-top:16px;font-size:12.5px;color:var(--muted-2);}

/* ---------- single post ---------- */
.article-hero{padding:56px 0 30px;}
.article-hero .container{max-width:var(--content);}
.article-cat{font-family:var(--mono);font-size:12px;font-weight:500;letter-spacing:.5px;text-transform:uppercase;color:var(--blue);margin-bottom:16px;display:inline-block;}
.article-hero h1{font-family:var(--display);font-weight:700;font-size:40px;line-height:1.14;letter-spacing:-1.2px;margin-bottom:18px;}
.article-meta{font-size:13.5px;color:var(--muted-2);display:flex;gap:14px;align-items:center;}
.article-feat{max-width:var(--content);margin:30px auto 0;padding:0 var(--gutter);}
.article-feat img{width:100%;border-radius:var(--radius);}
.article-body{max-width:var(--content);margin:40px auto 0;padding:0 var(--gutter) 70px;}
.article-body p,.article-body ul,.article-body ol,.article-body blockquote{font-size:17px;line-height:1.8;color:var(--text-2);margin-bottom:24px;}
.article-body h2{font-family:var(--display);font-size:27px;font-weight:700;letter-spacing:-.5px;margin:44px 0 16px;color:var(--text);}
.article-body h3{font-family:var(--display);font-size:21px;font-weight:600;margin:34px 0 12px;color:var(--text);}
.article-body ul,.article-body ol{padding-left:26px;}
.article-body li{margin-bottom:8px;}
.article-body a{color:var(--blue);text-decoration:underline;}
.article-body blockquote{border-left:3px solid var(--green);padding-left:22px;color:var(--muted);font-style:italic;}
.article-body img{border-radius:var(--radius);margin:10px 0 24px;}
.article-body code{font-family:var(--mono);font-size:14px;background:#f2f6fa;padding:2px 7px;border-radius:5px;}
.article-body pre{background:var(--ink-panel);color:#c9d3e0;padding:20px;border-radius:var(--radius);overflow-x:auto;margin-bottom:24px;}
.article-body pre code{background:none;padding:0;color:inherit;}

/* article footer CTA */
.article-cta{max-width:var(--content);margin:20px auto 0;padding:0 var(--gutter);}
.article-cta .box{background:var(--ink-panel);border-radius:16px;padding:38px 34px;text-align:center;}
.article-cta h3{font-family:var(--display);color:#fff;font-size:23px;font-weight:700;margin-bottom:10px;}
.article-cta p{color:var(--on-dark-muted);font-size:15px;margin-bottom:22px;}

/* ---------- footer (mirrors marketing site) ---------- */
.site-footer{background:var(--ink-panel);color:var(--on-dark);}
.site-footer .container{padding-top:56px;padding-bottom:34px;}
.foot-top{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:40px;padding-bottom:44px;border-bottom:1px solid var(--line-dark);}
.foot-brand .brand-name{color:#fff;}
.foot-brand p{margin-top:14px;font-size:13.5px;color:var(--on-dark-muted);max-width:280px;}
.foot-col h4{font-size:12px;font-weight:700;letter-spacing:1px;text-transform:uppercase;color:var(--on-dark-muted);margin-bottom:16px;}
.foot-col a{display:block;font-size:14px;color:var(--on-dark);margin-bottom:11px;}
.foot-col a:hover{color:var(--green-bright);text-decoration:none;}
.foot-bottom{display:flex;align-items:center;justify-content:space-between;padding-top:26px;font-size:12.5px;color:var(--on-dark-muted);flex-wrap:wrap;gap:12px;}

/* pagination */
.pagination{margin-top:50px;display:flex;gap:10px;justify-content:center;}
.pagination a,.pagination span{padding:9px 15px;border:1px solid var(--line-2);border-radius:9px;font-size:14px;color:var(--text-2);}
.pagination .current{background:var(--ink-panel);color:#fff;border-color:var(--ink-panel);}

.hamburger{display:none;}
@media (max-width:900px){
  :root{--gutter:24px;}
  .nav{display:none;}
  .nav-cta .nav-signin{display:none;}
  .hub-hero h1{font-size:32px;}
  .article-hero h1{font-size:30px;}
  .post-grid{grid-template-columns:1fr;}
  .foot-top{grid-template-columns:1fr 1fr;gap:30px;}
  .article-body p,.article-body ul,.article-body ol{font-size:16px;}
}
@media (max-width:520px){ .foot-top{grid-template-columns:1fr;} }
@media (prefers-reduced-motion:reduce){ *{animation:none!important;transition:none!important;} }

/* ============================================================
   Enhanced Knowledge Hub landing
   ============================================================ */

/* hero with subtle grid backdrop */
.hub-hero{position:relative;overflow:hidden;padding:72px 0 44px;}
.hub-hero-bg{position:absolute;inset:0;z-index:0;
  background-image:linear-gradient(rgba(20,136,196,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(20,136,196,.05) 1px,transparent 1px);
  background-size:52px 52px;
  -webkit-mask-image:radial-gradient(ellipse 60% 70% at 30% 20%,#000 30%,transparent 100%);
  mask-image:radial-gradient(ellipse 60% 70% at 30% 20%,#000 30%,transparent 100%);}
.hub-hero .container{position:relative;z-index:1;}
.hub-hero h1{font-size:46px;}

/* featured lead article */
.hub-featured{padding:0 0 10px;}
.feat-card{display:grid;grid-template-columns:1.15fr 1fr;gap:0;background:var(--surface);border:1px solid var(--line);border-radius:18px;overflow:hidden;text-decoration:none;color:inherit;transition:transform .2s,box-shadow .2s;}
.feat-card:hover{transform:translateY(-3px);box-shadow:0 22px 50px rgba(11,18,32,.10);text-decoration:none;}
.feat-media{position:relative;min-height:340px;background:linear-gradient(135deg,#0b1220,#132338);}
.feat-media img{width:100%;height:100%;object-fit:cover;position:absolute;inset:0;}
.feat-ph{position:absolute;inset:0;background:linear-gradient(135deg,#0b1220,#1b3350);}
.feat-body{padding:40px 38px;display:flex;flex-direction:column;justify-content:center;}
.feat-flag{display:inline-block;align-self:flex-start;font-family:var(--mono);font-size:11px;font-weight:600;letter-spacing:.6px;text-transform:uppercase;color:#fff;background:var(--green);padding:4px 12px;border-radius:100px;margin-bottom:16px;}
.feat-body .post-cat{font-family:var(--mono);font-size:11px;letter-spacing:.5px;text-transform:uppercase;color:var(--blue);margin-bottom:10px;}
.feat-body h2{font-family:var(--display);font-size:30px;font-weight:700;line-height:1.18;letter-spacing:-.8px;margin-bottom:14px;color:var(--text);}
.feat-body p{font-size:15.5px;color:var(--muted);line-height:1.6;margin-bottom:18px;}
.feat-meta{font-size:13px;color:var(--muted-2);}

/* category pills */
.cat-pills{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:34px;}
.pill{font-size:13.5px;font-weight:600;padding:8px 16px;border-radius:100px;border:1px solid var(--line-2);color:var(--text-2);background:var(--surface);text-decoration:none;transition:all .15s;}
.pill:hover{border-color:var(--blue);color:var(--blue);text-decoration:none;}
.pill.active{background:var(--ink-panel);color:#fff;border-color:var(--ink-panel);}

/* post grid: make first row feel intentional */
.post-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px;}

/* key takeaways box in articles */
.takeaways{background:linear-gradient(180deg,rgba(0,184,122,.06),rgba(255,255,255,0));border:1px solid rgba(0,184,122,.25);border-radius:14px;padding:24px 26px;margin:0 0 32px;}
.takeaways .tk-label{font-family:var(--mono);font-size:11px;font-weight:600;letter-spacing:1px;text-transform:uppercase;color:var(--green);margin-bottom:12px;}
.takeaways ul{margin:0;padding-left:20px;}
.takeaways li{font-size:15.5px;line-height:1.6;color:var(--text-2);margin-bottom:8px;}

@media (max-width:900px){
  .hub-hero h1{font-size:32px;}
  .feat-card{grid-template-columns:1fr;}
  .feat-media{min-height:200px;}
  .feat-body{padding:28px 24px;}
  .feat-body h2{font-size:24px;}
  .post-grid{grid-template-columns:1fr;}
}
@media (min-width:901px) and (max-width:1100px){
  .post-grid{grid-template-columns:repeat(2,1fr);}
}

/* ============================================================
   Single article: hybrid TOC rail + share + read-next
   ============================================================ */

/* shell puts a sticky TOC rail beside the centered reading column */
.article-shell{max-width:1100px;margin:36px auto 0;padding:0 var(--gutter);display:grid;grid-template-columns:220px minmax(0,var(--content));gap:48px;justify-content:center;}
.article-shell .article-body{max-width:var(--content);margin:0;padding:0 0 20px;}

.toc-rail{position:relative;}
.toc-inner{position:sticky;top:96px;}
.toc-empty{visibility:hidden;}
.toc-label{font-family:var(--mono);font-size:11px;font-weight:600;letter-spacing:1px;text-transform:uppercase;color:var(--muted-2);margin-bottom:14px;}
#tocNav{display:flex;flex-direction:column;gap:2px;border-left:2px solid var(--line);}
.toc-a{font-size:13px;line-height:1.4;color:var(--muted);padding:6px 0 6px 14px;margin-left:-2px;border-left:2px solid transparent;text-decoration:none;transition:color .15s,border-color .15s;}
.toc-a:hover{color:var(--text);text-decoration:none;}
.toc-a.lvl3{padding-left:26px;font-size:12.5px;}
.toc-a.active{color:var(--blue);border-left-color:var(--blue);font-weight:600;}

.share-mini{margin-top:26px;display:flex;align-items:center;gap:8px;}
.share-label{font-family:var(--mono);font-size:10px;letter-spacing:.5px;text-transform:uppercase;color:var(--muted-2);margin-right:2px;}
.share-mini .sh{width:30px;height:30px;border:1px solid var(--line-2);border-radius:8px;display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:600;color:var(--text-2);text-decoration:none;transition:all .15s;font-family:var(--mono);}
.share-mini .sh:hover{border-color:var(--blue);color:var(--blue);text-decoration:none;}

/* read next */
.read-next{padding:56px 0 20px;border-top:1px solid var(--line);margin-top:50px;}
.rn-title{font-family:var(--display);font-size:24px;font-weight:700;letter-spacing:-.5px;margin-bottom:28px;}

@media (max-width:1000px){
  .article-shell{grid-template-columns:1fr;max-width:var(--content);gap:0;}
  .toc-rail{display:none;}  /* hide sticky TOC on tablet/mobile, reading column stays clean */
}