/* ============================================================
   MATERIA — Blog de DarkMatter AI (cosmos dark / violeta)
   ============================================================ */
:root{
  --bg:#0a0a14; --bg-2:#140d31; --card:linear-gradient(170deg,rgba(124,58,237,.10),rgba(20,13,49,.5));
  --text:#eaf0ff; --muted:#9aa6c8; --muted-2:#6b6b8a; --line:rgba(255,255,255,.1);
  --box:#120a26; --box-line:rgba(255,255,255,.08);
  --v:#7c3aed; --c:#a78bfa; --s:#c4b5fd;
  --grad:linear-gradient(110deg,#7c3aed,#a78bfa,#c4b5fd);
  --grad-soft:linear-gradient(110deg,rgba(124,58,237,.2),rgba(167,139,250,.16));
  --fd:"Inter","Helvetica Neue",Arial,sans-serif; --fb:"Inter",system-ui,sans-serif; --fm:"IBM Plex Mono",monospace;
  --maxw:1760px; --read:900px; --ease:cubic-bezier(.16,1,.3,1); --shadow:0 30px 64px -30px rgba(0,0,0,.85);
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0;border-radius:0}
html{scroll-behavior:smooth}
body{font-family:var(--fb);background:var(--bg);color:var(--text);line-height:1.7;-webkit-font-smoothing:antialiased;overflow-x:hidden}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
h1,h2,h3,h4{font-family:var(--fd);font-weight:800;line-height:1.14;letter-spacing:-.02em}
.wrap{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 clamp(22px,4.5vw,80px)}
.article .wrap{max-width:1500px}
.posts{max-width:1560px;margin-inline:auto}
.grad{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}

/* animated star/line field */
.fx{position:fixed;inset:0;z-index:-1;background:var(--bg);overflow:hidden}
.fx .grid{position:absolute;inset:-4px;background-image:linear-gradient(rgba(167,139,250,.06) 1px,transparent 1px),linear-gradient(90deg,rgba(167,139,250,.06) 1px,transparent 1px);background-size:60px 60px;animation:gp 11s ease-in-out infinite}
.fx .glow{position:absolute;width:520px;height:520px;border-radius:50%;filter:blur(80px);opacity:.4}
.fx .g1{background:radial-gradient(circle,#7c3aed,transparent 70%);top:-160px;right:-120px}
.fx .g2{background:radial-gradient(circle,#a78bfa,transparent 70%);bottom:-180px;left:-140px;opacity:.22}
@keyframes gp{0%,100%{opacity:.4}50%{opacity:.9}}

/* header */
.bhead{position:sticky;top:0;z-index:50;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:14px clamp(16px,4vw,34px);background:rgba(10,10,20,.72);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.logo{display:flex;align-items:center;gap:11px;font-family:var(--fd);font-weight:800;font-size:1.12rem}
.logo img{width:30px;height:30px;filter:drop-shadow(0 0 9px rgba(124,58,237,.6))}
.bnav{display:flex;align-items:center;gap:22px;font-size:.92rem}
.bnav a{color:var(--muted);transition:color .2s}.bnav a:hover{color:var(--text)}
.btn{display:inline-flex;align-items:center;gap:8px;font-family:var(--fd);font-weight:700;font-size:.95rem;padding:12px 22px;background:#7c3aed;color:#fff;cursor:pointer;border:0;transition:transform .3s var(--ease),filter .2s,background .2s}
.btn:hover{transform:translateY(-2px);background:#8b4ff0;filter:none}
.prose a.btn,.cta-box a.btn,.bnav a.cta .btn{color:#fff;border-bottom:0}
@media(max-width:620px){.bnav a:not(.cta){display:none}}

/* hero */
.bhero{padding:62px 0 24px;text-align:center}
.kick{font-family:var(--fm);font-weight:600;font-size:.78rem;letter-spacing:.22em;text-transform:uppercase;color:var(--c)}
.bhero h1{font-size:clamp(2.2rem,5vw,3.4rem);margin:14px auto 14px;max-width:16ch}
.bhero p{color:var(--muted);font-size:1.08rem;max-width:60ch;margin:0 auto}

/* posts grid */
.posts{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;padding:42px 0 84px}
@media(max-width:900px){.posts{grid-template-columns:1fr 1fr}}
@media(max-width:600px){.posts{grid-template-columns:1fr}}
.post{display:flex;flex-direction:column;background:var(--card);border:1px solid var(--line);overflow:hidden;transition:transform .45s var(--ease),box-shadow .45s,border-color .3s}
.post:hover{transform:translateY(-6px);box-shadow:var(--shadow);border-color:rgba(167,139,250,.4)}
.post .thumb{aspect-ratio:16/9;display:grid;place-items:center;position:relative;overflow:hidden}
.post .thumb .ico{width:58px;height:58px;color:#0a0a14}
.post .body{padding:20px 22px 24px;display:flex;flex-direction:column;gap:8px;flex:1}
.post .tag{font-family:var(--fm);font-weight:600;font-size:.72rem;letter-spacing:.08em;text-transform:uppercase;color:var(--c)}
.post h3{font-size:1.14rem}
.post p{color:var(--muted);font-size:.92rem}
.post .meta{margin-top:auto;color:var(--muted-2);font-size:.8rem;padding-top:8px;font-family:var(--fm)}

/* article */
.article{padding:30px 0 84px}
.crumbs{font-size:.85rem;color:var(--muted-2);margin-bottom:18px}.crumbs a:hover{color:var(--c)}
.a-hero{aspect-ratio:21/8;display:grid;place-items:center;margin-bottom:30px;border:1px solid var(--line);overflow:hidden}
.a-hero .ico{width:88px;height:88px;color:#0a0a14}
.a-head{max-width:var(--read);margin:0 auto}
.a-head .tag{font-family:var(--fm);font-weight:600;font-size:.74rem;letter-spacing:.1em;text-transform:uppercase;color:var(--c)}
.a-head h1{font-size:clamp(1.9rem,4.2vw,2.8rem);margin:12px 0 14px}
.a-head .sub{color:var(--muted);font-size:1.1rem}
.a-head .byline{display:flex;gap:10px;margin-top:18px;color:var(--muted-2);font-size:.84rem;border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:12px 0;font-family:var(--fm)}
.prose{max-width:var(--read);margin:30px auto 0}
.prose h2{font-size:1.5rem;margin:34px 0 12px}
.prose h3{font-size:1.18rem;margin:24px 0 8px}
.prose p{margin:0 0 16px}
.prose ul,.prose ol{margin:0 0 16px 22px}.prose li{margin:6px 0}
.prose a{color:var(--c);border-bottom:1px solid currentColor}

.stat-row{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:24px 0}
@media(max-width:560px){.stat-row{grid-template-columns:1fr}}
.statbox{background:var(--box);border:1px solid var(--box-line);padding:20px;text-align:center}
.statbox .n{font-family:var(--fd);font-weight:800;font-size:2rem;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.statbox .t{font-size:.85rem;color:var(--muted);margin-top:4px}
.callout{background:var(--grad-soft);border-left:4px solid var(--v);padding:18px 20px;margin:24px 0}
.callout.warn{background:rgba(255,140,90,.12);border-left-color:#ff8c5a}
.steps{counter-reset:s;margin:24px 0;display:grid;gap:12px}
.steps .step{display:grid;grid-template-columns:auto 1fr;gap:16px;background:var(--box);border:1px solid var(--box-line);padding:18px 20px}
.steps .step::before{counter-increment:s;content:counter(s);font-family:var(--fd);font-weight:800;font-size:1.2rem;width:42px;height:42px;display:grid;place-items:center;background:var(--grad);color:#0a0a14}
.steps .step h4{margin-bottom:4px;font-size:1.04rem}.steps .step p{margin:0;color:var(--muted);font-size:.92rem}
.chart{background:var(--box);border:1px solid var(--box-line);padding:22px;margin:24px 0}
.chart .ctitle{font-family:var(--fd);font-weight:700;font-size:.92rem;margin-bottom:16px}
.bar{display:grid;grid-template-columns:150px 1fr auto;align-items:center;gap:12px;margin:10px 0;font-size:.85rem}
.bar .track{height:14px;background:var(--line)}.bar .fill{height:100%;background:var(--grad)}
.bar .val{font-family:var(--fm);font-weight:600;color:var(--c)}
.takeaway{background:var(--card);border:1px solid rgba(167,139,250,.3);padding:24px;margin:32px 0}
.takeaway h4{font-family:var(--fd);color:var(--c);margin-bottom:10px}.takeaway ul{margin:0 0 0 20px}
.cta-box{text-align:center;background:var(--card);border:1px solid var(--line);padding:34px;margin:40px 0 0}
.cta-box h3{font-size:1.4rem;margin-bottom:8px}.cta-box p{color:var(--muted);margin-bottom:18px}
.bfoot{border-top:1px solid var(--line);padding:40px 0;color:var(--muted-2);font-size:.85rem;text-align:center}
.bfoot a{color:var(--c)}

.bg-sec{background:linear-gradient(130deg,#1a103d,#7c3aed)}
.bg-auto{background:linear-gradient(130deg,#140d31,#a78bfa)}
.bg-ai{background:linear-gradient(130deg,#0c0820,#7c3aed,#c4b5fd)}
.bg-sys{background:linear-gradient(130deg,#1a103d,#5b21b6)}
.bg-grow{background:linear-gradient(130deg,#140d31,#c4b5fd)}