/* The AI Post — black & white + accent blue, glass, rounded, fast */
:root{
  --bg:#ffffff; --bg2:#f6f7f9; --fg:#0b0d12; --muted:#5a6270;
  --line:#e8eaf0; --blue:#2563eb; --blue2:#3b82f6; --glass:rgba(255,255,255,.72);
  --card:#ffffff; --code:#f1f3f7; --hero:#0b0d12;
  --serif:"Source Serif 4", Georgia, serif; --sans:"Inter",-apple-system,"Segoe UI",Roboto,sans-serif;
}
[data-theme="dark"]{
  --bg:#0a0c10; --bg2:#11141a; --fg:#e9ecf2; --muted:#8b93a3;
  --line:#232833; --card:#12151c; --glass:rgba(16,19,26,.75); --code:#191d26; --hero:#06080c;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--fg);font-family:var(--sans);line-height:1.65;font-size:16px;-webkit-font-smoothing:antialiased;transition:background .3s,color .3s}
a{color:var(--blue);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%}
.container{max-width:1140px;margin:0 auto;padding:0 22px}
/* sticky glass header */
header{position:sticky;top:0;z-index:60;background:var(--glass);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;gap:26px;height:64px}
.logo{font-weight:800;font-size:20px;letter-spacing:-.4px;color:var(--fg);display:flex;align-items:center;gap:8px}
.logo .dot{width:9px;height:9px;border-radius:50%;background:var(--blue);box-shadow:0 0 12px var(--blue2);animation:pulse 2s infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.4}}
.nav-links{display:flex;gap:4px;flex:1}
.nav-links a{padding:7px 12px;border-radius:9px;font-size:14px;font-weight:600;color:var(--muted)}
.nav-links a:hover{background:var(--bg2);color:var(--fg);text-decoration:none}
.nav-links a.on{color:var(--blue)}
.nav-right{display:flex;align-items:center;gap:10px}
#searchBtn{background:var(--bg2);border:1px solid var(--line);color:var(--muted);border-radius:99px;padding:7px 16px;font-size:13.5px;cursor:pointer;display:flex;gap:8px;align-items:center}
#themeToggle{width:36px;height:36px;border-radius:10px;border:1px solid var(--line);background:var(--bg2);cursor:pointer;font-size:15px}
/* search overlay */
#searchOverlay{position:fixed;inset:0;background:rgba(8,10,14,.55);backdrop-filter:blur(6px);z-index:90;display:none;align-items:flex-start;justify-content:center;padding-top:12vh}
#searchOverlay.open{display:flex}
.search-box{width:min(620px,92vw);background:var(--bg);border-radius:18px;padding:18px;box-shadow:0 30px 80px rgba(0,0,0,.35);border:1px solid var(--line)}
.search-box input{width:100%;border:0;outline:0;font-size:18px;padding:8px 4px;background:transparent;color:var(--fg);font-family:var(--sans)}
.search-results{max-height:52vh;overflow:auto;margin-top:10px}
.sr{display:block;padding:11px 10px;border-radius:10px;border-bottom:1px solid var(--line)}
.sr:hover{background:var(--bg2);text-decoration:none}
.sr b{display:block;color:var(--fg);font-size:15px}
.sr span{font-size:12.5px;color:var(--muted)}
/* hero */
.hero{background:var(--hero);color:#fff;border-radius:0 0 26px 26px;padding:52px 0 44px;margin-bottom:34px;overflow:hidden;position:relative}
.hero::after{content:"";position:absolute;width:520px;height:520px;border-radius:50%;background:radial-gradient(circle,rgba(37,99,235,.32),transparent 70%);top:-220px;right:-120px;pointer-events:none}
.hero .container{position:relative;z-index:2}
.hero .kicker{display:inline-block;background:rgba(37,99,235,.2);border:1px solid rgba(59,130,246,.5);color:#93c5fd;font-size:12px;font-weight:800;letter-spacing:1.2px;text-transform:uppercase;padding:6px 14px;border-radius:99px;margin-bottom:16px}
.hero h1{font-family:var(--serif);font-size:clamp(30px,4.8vw,52px);font-weight:800;letter-spacing:-1.2px;line-height:1.08;max-width:780px}
.hero h1 b{color:var(--blue2)}
.hero p{color:#9aa5b8;max-width:600px;margin:14px 0 24px;font-size:16.5px}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:8px;padding:11px 22px;border-radius:12px;font-weight:700;font-size:14.5px;transition:transform .15s,box-shadow .15s}
.btn:hover{text-decoration:none;transform:translateY(-1px)}
.btn.blue{background:var(--blue);color:#fff;box-shadow:0 8px 24px rgba(37,99,235,.35)}
.btn.ghost{background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.18);color:#fff}
.hero-strip{display:flex;gap:26px;margin-top:30px;flex-wrap:wrap;font-size:13px;color:#8b93a3}
.hero-strip b{color:#fff;font-size:17px;display:block}
/* section headers */
section{margin-bottom:40px}
.sec-head{display:flex;align-items:baseline;justify-content:space-between;margin-bottom:16px}
.sec-head h2{font-family:var(--serif);font-size:26px;letter-spacing:-.4px}
.sec-head a{font-size:13px;font-weight:700}
/* article cards */
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.grid.news{grid-template-columns:repeat(2,1fr)}
.card{background:var(--card);border:1px solid var(--line);border-radius:16px;overflow:hidden;transition:transform .18s,box-shadow .18s;display:flex;flex-direction:column}
.card:hover{transform:translateY(-3px);box-shadow:0 16px 36px rgba(15,23,42,.09);text-decoration:none}
.thumb{height:150px;display:flex;align-items:center;justify-content:center;font-size:52px;background:linear-gradient(135deg,var(--bg2),var(--line));position:relative}
.thumb .tag{position:absolute;top:12px;left:12px;background:var(--glass);backdrop-filter:blur(8px);border:1px solid var(--line);font-size:11px;font-weight:800;letter-spacing:.6px;text-transform:uppercase;padding:4px 10px;border-radius:8px;color:var(--fg)}
.card .body{padding:16px 18px 18px;display:flex;flex-direction:column;gap:8px;flex:1}
.card h3{font-size:16.5px;line-height:1.35;letter-spacing:-.2px;color:var(--fg)}
.card p{font-size:13.5px;color:var(--muted);flex:1}
.meta{font-size:12px;color:var(--muted);display:flex;gap:10px;flex-wrap:wrap}
.big-card{grid-column:span 2;flex-direction:row}
.big-card .thumb{width:44%;height:auto;min-height:200px;font-size:72px}
.big-card .body{flex:1}
@media(max-width:900px){.grid{grid-template-columns:1fr 1fr}.big-card{grid-column:span 2;flex-direction:column}.big-card .thumb{width:100%;min-height:150px}}
@media(max-width:560px){.grid{grid-template-columns:1fr}.nav-links{display:none}.big-card{grid-column:span 1}}
/* topics strip */
.topics{display:flex;gap:9px;flex-wrap:wrap}
.topic{background:var(--bg2);border:1px solid var(--line);border-radius:99px;padding:8px 16px;font-size:13px;font-weight:600;color:var(--fg);transition:all .15s}
.topic:hover{background:var(--blue);color:#fff;border-color:var(--blue);text-decoration:none}
/* newsletter */
.newsletter{background:var(--bg2);border:1px solid var(--line);border-radius:20px;padding:32px;text-align:center}
.newsletter h2{font-family:var(--serif);font-size:25px;margin-bottom:8px}
.newsletter p{color:var(--muted);font-size:14px;max-width:460px;margin:0 auto 16px}
.newsletter form{display:flex;gap:10px;max-width:430px;margin:0 auto}
.newsletter input{flex:1;padding:12px 16px;border:1px solid var(--line);border-radius:10px;background:var(--bg);color:var(--fg);font-size:14.5px}
.newsletter button{background:var(--blue);color:#fff;border:0;padding:12px 22px;border-radius:10px;font-weight:700;cursor:pointer}
/* footer */
footer{border-top:1px solid var(--line);padding:34px 0 26px;margin-top:46px}
.foot{display:flex;justify-content:space-between;gap:18px;flex-wrap:wrap;font-size:13.5px;color:var(--muted)}
.foot a{color:var(--muted)}
.foot .brand{font-weight:800;color:var(--fg);font-size:15px}
.disc{margin-top:16px;font-size:12px;color:var(--muted);line-height:1.5;max-width:860px}
/* article page */
article.post{max-width:760px;margin:0 auto;padding:40px 0 20px}
.post .tag{display:inline-block;background:var(--bg2);border:1px solid var(--line);font-size:11.5px;font-weight:800;letter-spacing:.7px;text-transform:uppercase;padding:4px 11px;border-radius:8px;color:var(--blue);margin-bottom:14px}
.post h1{font-family:var(--serif);font-size:clamp(27px,4.2vw,40px);line-height:1.14;letter-spacing:-.8px;margin-bottom:14px}
.post .meta{font-size:13.5px;margin-bottom:24px}
.post .cover{height:230px;border-radius:18px;display:flex;align-items:center;justify-content:center;font-size:92px;background:linear-gradient(135deg,var(--bg2),var(--line));margin-bottom:28px}
.post h2{font-family:var(--serif);font-size:24px;margin:34px 0 12px;letter-spacing:-.3px}
.post h3{font-family:var(--serif);font-size:19px;margin:24px 0 10px}
.post p{margin-bottom:16px}
.post ul,.post ol{margin:0 0 18px 24px}
.post li{margin-bottom:8px}
.post blockquote{border-left:4px solid var(--blue);background:var(--bg2);padding:15px 19px;border-radius:0 12px 12px 0;margin:20px 0;font-family:var(--serif);font-size:17.5px}
.post code{background:var(--code);padding:2px 7px;border-radius:6px;font-size:13.5px}
.post table{width:100%;border-collapse:collapse;margin:18px 0;font-size:14.5px}
.post th,.post td{border:1px solid var(--line);padding:10px 12px;text-align:left}
.post th{background:var(--bg2)}
.toc{background:var(--bg2);border:1px solid var(--line);border-radius:14px;padding:18px 22px;margin:22px 0;font-size:14.5px}
.toc b{display:block;margin-bottom:8px}
.toc a{display:block;padding:3px 0;color:var(--muted)}
.toc a:hover{color:var(--blue)}
.cta-box{background:var(--hero);color:#fff;border-radius:18px;padding:26px;margin:30px 0;text-align:center}
.cta-box h3{font-family:var(--serif);font-size:20px;margin-bottom:8px}
.cta-box p{color:#9aa5b8;font-size:14px;margin-bottom:14px}
.cta-box a{background:var(--blue);color:#fff;padding:11px 22px;border-radius:10px;font-weight:700;display:inline-block}
.share{display:flex;gap:10px;margin:24px 0;flex-wrap:wrap}
.share button{background:var(--bg2);border:1px solid var(--line);border-radius:10px;padding:8px 14px;font-size:13px;font-weight:600;color:var(--fg);cursor:pointer}
.share button:hover{background:var(--blue);color:#fff;border-color:var(--blue)}
.author{display:flex;gap:14px;align-items:center;background:var(--bg2);border:1px solid var(--line);border-radius:16px;padding:18px;margin:28px 0}
.author .av{width:50px;height:50px;border-radius:50%;background:var(--blue);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:19px;flex-shrink:0}
.author b{display:block}
.author p{font-size:13.5px;color:var(--muted);margin:2px 0 0}
.related{display:grid;grid-template-columns:repeat(2,1fr);gap:16px;margin-top:14px}
@media(max-width:640px){.related{grid-template-columns:1fr}}
/* simple pages */
.simple{max-width:780px;margin:0 auto;padding:46px 0 20px}
.simple h1{font-family:var(--serif);font-size:34px;margin-bottom:16px}
.simple h2{font-family:var(--serif);font-size:21px;margin:26px 0 10px}
.simple p,.simple li{margin-bottom:12px;color:var(--muted)}
/* bookmarks bar */
#bmBar{position:fixed;right:18px;bottom:18px;z-index:70;display:flex;flex-direction:column;gap:8px}
#bmBar button{width:44px;height:44px;border-radius:14px;border:1px solid var(--line);background:var(--glass);backdrop-filter:blur(10px);cursor:pointer;font-size:17px;box-shadow:0 8px 24px rgba(0,0,0,.12)}
#bmBar button.saved{background:var(--blue);color:#fff;border-color:var(--blue)}
/* ad placeholder */
.adslot{min-height:110px;background:var(--bg2);border:1px dashed var(--line);border-radius:12px;display:flex;align-items:center;justify-content:center;color:var(--muted);font-size:12.5px;margin:26px 0}
/* animations */
@keyframes fadeUp{from{opacity:0;transform:translateY(14px)}to{opacity:1;transform:none}}
.fadeUp{animation:fadeUp .5s ease both}
.card:nth-child(2){animation-delay:.06s}.card:nth-child(3){animation-delay:.12s}.card:nth-child(4){animation-delay:.18s}