/* ================================================================ */
/* PSI NEXUS · Blog — hoja compartida (identidad Obsidiana)         */
/* ================================================================ */

:root {
  --obsidian:      #0A0D10;
  --obsidian-2:    #12161b;
  --obsidian-3:    #1a1f26;
  --border:        rgba(255,255,255,0.09);
  --border-hi:     rgba(255,255,255,0.18);
  --cyan:          #3DC8E8;
  --cyan-deep:     #2B5FA8;
  --green:         #00FF88;
  --violet:        #7C3AED;
  --violet-lt:     #A855F7;
  --amber:         #FFB347;
  --bone:          #F5F1E8;
  --silver:        #E4E4E7;
  --silver-mid:    #A1A1AA;
  --silver-soft:   #71717A;
  --grad-identity: linear-gradient(135deg, var(--cyan-deep), var(--cyan));
  --grad-full:     linear-gradient(90deg, var(--violet-lt), var(--cyan), var(--green));
  --f-display: 'Space Grotesk','Inter',system-ui,sans-serif;
  --f-body:    'Inter',-apple-system,system-ui,sans-serif;
  --f-mono:    'JetBrains Mono','Courier New',monospace;
  --f-serif:   'Fraunces',Georgia,serif;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  background: var(--obsidian);
  color: var(--silver);
  font-family: var(--f-body);
  font-size: 16px;
  line-height: 1.7;
  letter-spacing: -0.01em;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 50% at 10% 8%, rgba(124,58,237,0.10), transparent 50%),
    radial-gradient(ellipse 80% 50% at 90% 92%, rgba(0,255,136,0.06), transparent 50%);
  pointer-events: none;
  z-index: 0;
}

em.gx {
  font-family: var(--f-serif);
  font-style: italic;
  font-weight: 500;
  background: var(--grad-full);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.kicker {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: .15em;
  text-transform: uppercase;
  color: var(--silver-mid);
}
.kicker::before {
  content: "";
  width: 36px;
  height: 1px;
  background: linear-gradient(90deg, var(--cyan), transparent);
}

/* ─── LOGO + NAV ─── */
.logo-mark { display: inline-flex; align-items: center; gap: 12px; text-decoration: none; }
.logo-badge {
  width: 42px; height: 26px;
  background: var(--grad-identity);
  clip-path: polygon(15% 0%, 85% 0%, 100% 50%, 85% 100%, 15% 100%, 0% 50%);
  display: flex; align-items: center; justify-content: center;
  font-family: var(--f-display); font-weight: 700; font-size: 10px;
  letter-spacing: 0.5px; color: var(--obsidian); font-style: italic; flex-shrink: 0;
}
.logo-nexus {
  font-family: var(--f-display); font-weight: 700; font-size: 18px;
  color: var(--silver); letter-spacing: -0.02em; line-height: 1;
}
.logo-img { height: 32px; width: auto; display: block; border-radius: 6px; }
header.nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(10,13,16,0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(35,41,49,0.8);
  padding: 14px 32px;
}
.nav-inner {
  max-width: 1160px; margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between; gap: 24px;
}
.nav-links { display: flex; gap: 26px; list-style: none; }
.nav-links a { color: var(--silver-mid); text-decoration: none; font-size: 14px; transition: color .2s; }
.nav-links a:hover { color: var(--bone); }
.nav-cta {
  font-family: var(--f-display); font-weight: 600; font-size: 14px;
  color: var(--obsidian); text-decoration: none;
  background: var(--grad-identity);
  padding: 9px 18px; border-radius: 8px;
  white-space: nowrap;
  transition: transform .15s, box-shadow .2s;
}
.nav-cta:hover { transform: translateY(-1px); box-shadow: 0 6px 22px rgba(61,200,232,0.25); }
@media (max-width: 760px) { .nav-links { display: none; } }

/* ─── PORTADA DEL BLOG ─── */
.blog-hero { position: relative; z-index: 1; padding: 90px 32px 50px; }
.blog-hero-inner { max-width: 1160px; margin: 0 auto; }
.blog-title {
  font-family: var(--f-display);
  font-size: clamp(34px, 5vw, 58px);
  font-weight: 700; line-height: 1.08; letter-spacing: -0.03em;
  color: var(--bone);
  margin: 16px 0 18px;
  max-width: 760px;
}
.blog-sub { font-size: 17px; color: var(--silver-mid); max-width: 580px; }

.posts-wrap { position: relative; z-index: 1; padding: 30px 32px 100px; }
.posts-inner { max-width: 1160px; margin: 0 auto; }
.posts-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
@media (max-width: 960px) { .posts-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 620px) { .posts-grid { grid-template-columns: 1fr; } }

.post-card {
  display: flex; flex-direction: column;
  background: var(--obsidian-2);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 28px 26px;
  text-decoration: none;
  transition: transform .25s, border-color .25s;
}
.post-card:hover { transform: translateY(-4px); border-color: var(--border-hi); }
.post-card-tags { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 16px; }
.ptag {
  font-family: var(--f-mono); font-size: 10px; letter-spacing: .08em;
  text-transform: uppercase; padding: 4px 10px; border-radius: 999px;
  border: 1px solid rgba(61,200,232,0.4); color: var(--cyan);
}
.ptag.violet { border-color: rgba(168,85,247,0.4); color: var(--violet-lt); }
.ptag.green { border-color: rgba(0,255,136,0.4); color: var(--green); }
.post-card h2 {
  font-family: var(--f-display); font-size: 20px; font-weight: 600;
  color: var(--bone); line-height: 1.3; margin-bottom: 12px;
}
.post-card p { font-size: 14.5px; color: var(--silver-mid); flex: 1; }
.post-card-meta {
  font-family: var(--f-mono); font-size: 11px; letter-spacing: .06em;
  color: var(--silver-soft); margin-top: 20px;
  display: flex; justify-content: space-between; align-items: center;
}
.post-card-meta .arrow { color: var(--cyan); font-size: 14px; }

/* ─── ARTÍCULO ─── */
article.post { position: relative; z-index: 1; padding: 80px 32px 60px; }
.post-inner { max-width: 720px; margin: 0 auto; }
.post-head { margin-bottom: 44px; }
.post-h1 {
  font-family: var(--f-display);
  font-size: clamp(30px, 4.4vw, 46px);
  font-weight: 700; line-height: 1.12; letter-spacing: -0.02em;
  color: var(--bone);
  margin: 16px 0 20px;
}
.post-meta {
  font-family: var(--f-mono); font-size: 12px; letter-spacing: .05em;
  color: var(--silver-soft);
  display: flex; gap: 14px; flex-wrap: wrap; align-items: center;
}
.post-meta .sep { color: var(--obsidian-4); }
.post-meta .author { color: var(--cyan); }

.post-body { font-size: 16.5px; color: var(--silver); }
.post-body p { margin-bottom: 22px; color: var(--silver-mid); }
.post-body p strong { color: var(--silver); }
.post-body h2 {
  font-family: var(--f-display); font-size: 25px; font-weight: 600;
  color: var(--bone); margin: 44px 0 16px; letter-spacing: -0.01em;
}
.post-body ul, .post-body ol { margin: 0 0 22px 4px; list-style: none; }
.post-body li {
  color: var(--silver-mid);
  padding: 6px 0 6px 24px; position: relative;
}
.post-body li::before {
  content: ""; position: absolute; left: 0; top: 15px;
  width: 8px; height: 8px; border-radius: 2px;
  background: var(--grad-full);
}
.post-body blockquote {
  border-left: 3px solid var(--violet-lt);
  background: rgba(124,58,237,0.06);
  border-radius: 0 12px 12px 0;
  padding: 20px 26px;
  margin: 0 0 22px;
}
.post-body blockquote p { margin: 0; color: var(--silver); font-style: italic; }

.post-callout {
  background: rgba(0,255,136,0.04);
  border: 1px solid rgba(0,255,136,0.18);
  border-left: 3px solid var(--green);
  border-radius: 12px;
  padding: 22px 26px;
  margin: 0 0 22px;
}
.post-callout .label {
  font-family: var(--f-mono); font-size: 10.5px; letter-spacing: .12em;
  text-transform: uppercase; color: var(--green); margin-bottom: 8px;
}
.post-callout p { margin: 0; color: var(--silver); }

.post-callout.warn { background: rgba(255,179,71,0.04); border-color: rgba(255,179,71,0.22); border-left-color: var(--amber); }
.post-callout.warn .label { color: var(--amber); }

/* ─── CTA al pie del artículo ─── */
.post-cta {
  margin-top: 56px;
  background: var(--obsidian-2);
  border: 1px solid rgba(61,200,232,0.3);
  border-radius: 18px;
  padding: 34px 32px;
  text-align: center;
}
.post-cta h3 { font-family: var(--f-display); font-size: 22px; font-weight: 600; color: var(--bone); margin-bottom: 10px; }
.post-cta p { color: var(--silver-mid); font-size: 15px; max-width: 460px; margin: 0 auto 24px; }
.btn-primary {
  display: inline-block;
  font-family: var(--f-display); font-weight: 600; font-size: 15px;
  color: var(--obsidian); text-decoration: none;
  background: var(--grad-identity);
  padding: 14px 28px; border-radius: 10px;
  transition: transform .15s, box-shadow .2s;
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 10px 30px rgba(61,200,232,0.3); }

.post-nav {
  max-width: 720px; margin: 40px auto 0;
  display: flex; justify-content: space-between; gap: 16px;
  font-size: 14px;
}
.post-nav a { color: var(--silver-mid); text-decoration: none; transition: color .2s; }
.post-nav a:hover { color: var(--cyan); }

/* ─── FOOTER ─── */
footer {
  border-top: 1px solid var(--border);
  padding: 36px 32px;
  position: relative; z-index: 1;
}
.footer-inner {
  max-width: 1160px; margin: 0 auto;
  display: flex; justify-content: space-between; align-items: center; gap: 20px; flex-wrap: wrap;
}
.footer-note { font-family: var(--f-mono); font-size: 11.5px; color: var(--silver-soft); }
.footer-links { display: flex; gap: 20px; }
.footer-links a { color: var(--silver-mid); text-decoration: none; font-size: 13px; }
.footer-links a:hover { color: var(--cyan); }