/* ============ Civilization Decoded — theme ============ */
:root{
  --bg:        #070b18;
  --bg-2:      #0a1024;
  --panel:     #0e1530;
  --panel-2:   #111a3a;
  --line:      rgba(120,160,255,.12);
  --line-2:    rgba(120,160,255,.22);
  --text:      #eaf0ff;
  --muted:     #9aa7c7;
  --muted-2:   #6c7a9e;
  --teal:      #2ee6c8;
  --cyan:      #38bdf8;
  --gold:      #e9c46a;
  --glow:      0 0 0 1px var(--line), 0 18px 50px -20px rgba(0,0,0,.7);
  --grad:      linear-gradient(110deg,#2ee6c8,#38bdf8 55%,#7c9bff);
  --radius:    18px;
  --maxw:      1180px;
  font-synthesis:none;
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:'Inter',system-ui,sans-serif;
  background:var(--bg);
  color:var(--text);
  line-height:1.6;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
body::before{ /* radial ambient light */
  content:"";position:fixed;inset:0;z-index:-3;pointer-events:none;
  background:
    radial-gradient(900px 500px at 80% -10%, rgba(56,189,248,.10), transparent 60%),
    radial-gradient(800px 500px at 0% 10%, rgba(46,230,200,.08), transparent 55%),
    linear-gradient(180deg,var(--bg),var(--bg-2));
}
#net-bg{position:fixed;inset:0;z-index:-2;width:100%;height:100%;opacity:.55}
.grid-overlay{
  position:fixed;inset:0;z-index:-2;pointer-events:none;opacity:.35;
  background-image:
    linear-gradient(var(--line) 1px,transparent 1px),
    linear-gradient(90deg,var(--line) 1px,transparent 1px);
  background-size:64px 64px;
  -webkit-mask-image:radial-gradient(circle at 50% 0%,#000,transparent 75%);
          mask-image:radial-gradient(circle at 50% 0%,#000,transparent 75%);
}

h1,h2,h3,.brand{font-family:'Sora',sans-serif;letter-spacing:-.02em;line-height:1.1}
a{color:inherit;text-decoration:none}
.grad{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}

/* ============ Buttons ============ */
.btn{
  display:inline-flex;align-items:center;gap:.5rem;
  font-weight:600;font-size:.95rem;padding:.72rem 1.25rem;border-radius:999px;
  border:1px solid transparent;cursor:pointer;transition:.22s ease;white-space:nowrap;
}
.btn-primary{background:var(--grad);color:#04121b;box-shadow:0 10px 30px -10px rgba(46,230,200,.5)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 16px 40px -12px rgba(56,189,248,.6)}
.btn-primary.big{padding:.95rem 1.8rem;font-size:1.05rem}
.btn-ghost{border-color:var(--line-2);color:var(--text);background:rgba(255,255,255,.02)}
.btn-ghost:hover{border-color:var(--teal);color:#fff}
.btn-sub{background:rgba(56,189,248,.12);border-color:var(--line-2);color:#dff3ff}
.btn-sub:hover{background:rgba(56,189,248,.22);border-color:var(--cyan)}

/* ============ Nav ============ */
.nav{
  position:sticky;top:0;z-index:50;
  display:flex;align-items:center;justify-content:space-between;
  padding:.85rem clamp(1rem,4vw,2.5rem);
  background:rgba(7,11,24,.6);backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line);
}
.brand{display:flex;align-items:center;gap:.6rem;font-size:1.15rem;font-weight:700}
.brand img{width:36px;height:36px;border-radius:50%;object-fit:cover}
.brand strong{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;font-weight:800}
.brand.small{font-size:1rem}
.nav-links{display:flex;align-items:center;gap:1.6rem}
.nav-links a{color:var(--muted);font-weight:500;font-size:.95rem;transition:.2s}
.nav-links a:hover{color:#fff}
.nav-links .btn-sub{color:#dff3ff}
.nav-toggle{display:none;background:none;border:none;color:#fff;font-size:1.5rem;cursor:pointer}

/* ============ Hero ============ */
.hero{padding:clamp(3.5rem,9vw,7rem) clamp(1rem,4vw,2.5rem) clamp(2rem,5vw,4rem)}
.hero-inner{max-width:var(--maxw);margin:0 auto;text-align:center}
.eyebrow{
  display:inline-flex;align-items:center;gap:.55rem;
  font-size:.82rem;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);
  border:1px solid var(--line);padding:.45rem .9rem;border-radius:999px;
  background:rgba(255,255,255,.02);margin-bottom:1.6rem;
}
.eyebrow .dot{width:8px;height:8px;border-radius:50%;background:var(--teal);box-shadow:0 0 12px var(--teal);animation:pulse 2.4s infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.35}}
.hero h1{font-size:clamp(2.3rem,6.2vw,4.6rem);font-weight:800;margin-bottom:1.3rem}
.h1-brand{display:block;font-family:'Sora';font-size:clamp(.8rem,1.6vw,1.05rem);font-weight:600;letter-spacing:.34em;text-transform:uppercase;color:var(--teal);margin-bottom:.9rem}
.h1-tag{display:block}
.lead strong{color:var(--text);font-weight:600}
.lead{max-width:680px;margin:0 auto 2.2rem;color:var(--muted);font-size:clamp(1rem,1.6vw,1.18rem)}
.hero-cta{display:flex;gap:1rem;justify-content:center;flex-wrap:wrap;margin-bottom:3rem}
.hero-stats{display:flex;gap:clamp(1.5rem,5vw,4rem);justify-content:center;flex-wrap:wrap}
.hero-stats div{display:flex;flex-direction:column}
.hero-stats b{font-family:'Sora';font-size:clamp(1.8rem,4vw,2.6rem);font-weight:800;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero-stats span{color:var(--muted-2);font-size:.85rem;letter-spacing:.04em}

/* ============ Sections ============ */
.section{max-width:var(--maxw);margin:0 auto;padding:clamp(3rem,7vw,5.5rem) clamp(1rem,4vw,2.5rem)}
.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:1rem;flex-wrap:wrap;margin-bottom:2.4rem}
.kicker{display:inline-block;font-size:.78rem;letter-spacing:.18em;text-transform:uppercase;color:var(--teal);font-weight:600;margin-bottom:.6rem}
.section-head h2{font-size:clamp(1.7rem,3.6vw,2.6rem);font-weight:700}
.section-sub{color:var(--muted);max-width:620px;margin-top:.7rem}
.see-all{color:var(--cyan);font-weight:600;font-size:.95rem}
.see-all:hover{color:var(--teal)}

/* ============ Videos ============ */
.video-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:1.4rem}
.video-card{
  background:linear-gradient(180deg,var(--panel),var(--bg-2));
  border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;
  display:flex;flex-direction:column;transition:.25s ease;
}
.video-card:hover{transform:translateY(-5px);border-color:var(--line-2);box-shadow:var(--glow)}
.thumb{position:relative;aspect-ratio:16/9;overflow:hidden;background:var(--panel-2)}
.thumb img{width:100%;height:100%;object-fit:cover;transition:.4s ease}
.video-card:hover .thumb img{transform:scale(1.06)}
.thumb .play{
  position:absolute;inset:0;display:flex;align-items:center;justify-content:center;
  background:radial-gradient(circle,rgba(7,11,24,.15),rgba(7,11,24,.55));opacity:0;transition:.25s
}
.video-card:hover .play{opacity:1}
.thumb .play svg{width:58px;height:58px;filter:drop-shadow(0 6px 20px rgba(0,0,0,.6))}
.video-body{padding:1.1rem 1.2rem 1.3rem;display:flex;flex-direction:column;gap:.5rem;flex:1}
.video-body h3{font-size:1.05rem;font-weight:600;line-height:1.35;font-family:'Inter'}
.video-meta{margin-top:auto;color:var(--muted-2);font-size:.82rem;display:flex;align-items:center;gap:.5rem}
.video-meta::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--teal)}

/* skeleton */
.skeleton{background:linear-gradient(180deg,var(--panel),var(--bg-2));border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
.skeleton .sk{background:linear-gradient(90deg,rgba(255,255,255,.03),rgba(255,255,255,.08),rgba(255,255,255,.03));background-size:200% 100%;animation:shimmer 1.4s infinite}
.skeleton .sk-thumb{aspect-ratio:16/9}
.skeleton .sk-line{height:14px;margin:1rem 1.2rem;border-radius:6px}
.skeleton .sk-line.short{width:55%}
@keyframes shimmer{0%{background-position:200% 0}100%{background-position:-200% 0}}
.feed-note{margin-top:1.4rem;color:var(--muted-2);font-size:.85rem;text-align:center}
.feed-note a{color:var(--cyan)}

/* ============ Codex ============ */
.codex-controls{display:flex;align-items:center;justify-content:space-between;gap:1rem;flex-wrap:wrap;margin-bottom:2rem}
.filters{display:flex;gap:.55rem;flex-wrap:wrap}
.chip{
  font-size:.85rem;font-weight:600;color:var(--muted);
  padding:.5rem 1rem;border-radius:999px;border:1px solid var(--line);
  background:rgba(255,255,255,.02);cursor:pointer;transition:.2s;white-space:nowrap;
}
.chip:hover{color:#fff;border-color:var(--line-2)}
.chip.active{color:#04121b;background:var(--grad);border-color:transparent}
.search-wrap{position:relative;flex:1;min-width:200px;max-width:300px}
#search{
  width:100%;padding:.62rem 1rem;border-radius:999px;
  background:var(--panel);border:1px solid var(--line);color:var(--text);font-size:.92rem;
  font-family:inherit;outline:none;transition:.2s;
}
#search:focus{border-color:var(--teal);box-shadow:0 0 0 3px rgba(46,230,200,.12)}
#search::placeholder{color:var(--muted-2)}

.topic-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(310px,1fr));gap:1.2rem}
.topic-card{
  position:relative;background:linear-gradient(180deg,var(--panel),var(--bg-2));
  border:1px solid var(--line);border-radius:16px;padding:1.4rem 1.4rem 1.5rem;
  transition:.25s ease;overflow:hidden;
}
.topic-card[hidden]{display:none}
.topic-card::before{content:"";position:absolute;left:0;top:0;bottom:0;width:3px;background:var(--tier-color,var(--teal));opacity:.8}
.topic-card:hover{transform:translateY(-4px);border-color:var(--line-2);box-shadow:var(--glow)}
.topic-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:.7rem}
.topic-num{font-family:'Sora';font-size:.8rem;color:var(--muted-2);font-weight:700;letter-spacing:.05em}
.tier-tag{
  font-size:.68rem;font-weight:700;letter-spacing:.06em;text-transform:uppercase;
  padding:.28rem .6rem;border-radius:999px;
  color:var(--tier-color,var(--teal));
  background:color-mix(in srgb, var(--tier-color,var(--teal)) 14%, transparent);
  border:1px solid color-mix(in srgb, var(--tier-color,var(--teal)) 35%, transparent);
}
.topic-card h3{font-size:1.12rem;font-weight:600;margin-bottom:.5rem;font-family:'Sora'}
.topic-card p{color:var(--muted);font-size:.92rem}
.empty{text-align:center;color:var(--muted);padding:3rem 0}

/* ============ About ============ */
.about-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:clamp(2rem,5vw,4rem);align-items:center}
.about-grid p{color:var(--muted);margin:1rem 0}
.about-grid em{color:var(--text);font-style:italic}
.about-grid .btn{margin-top:1rem}
.about-cards{display:flex;flex-direction:column;gap:1rem}
.mini-card{
  background:linear-gradient(180deg,var(--panel),var(--bg-2));
  border:1px solid var(--line);border-radius:16px;padding:1.3rem 1.4rem;transition:.2s;
}
.mini-card:hover{border-color:var(--line-2);transform:translateX(4px)}
.mini-card span{font-size:1.5rem}
.mini-card b{display:block;margin:.4rem 0 .3rem;font-family:'Sora';font-size:1.05rem}
.mini-card p{color:var(--muted);font-size:.9rem}

/* ============ Footer ============ */
.footer{border-top:1px solid var(--line);margin-top:3rem;background:linear-gradient(180deg,transparent,rgba(56,189,248,.04))}
.footer-cta{max-width:var(--maxw);margin:0 auto;text-align:center;padding:clamp(3rem,7vw,5rem) 1.5rem 3rem}
.footer-cta h2{font-size:clamp(1.8rem,4vw,2.8rem);font-weight:800;margin-bottom:.8rem}
.footer-cta p{color:var(--muted);margin-bottom:1.8rem}
.footer-meta{
  max-width:var(--maxw);margin:0 auto;
  display:flex;align-items:center;justify-content:center;flex-wrap:wrap;
  gap:.55rem .85rem;padding:0 clamp(1rem,4vw,2.5rem) 1.8rem;
  color:var(--muted);font-size:.9rem;text-align:center;
}
.footer-meta a{color:var(--muted);transition:.2s;border-bottom:1px solid transparent}
.footer-meta a:hover{color:var(--teal);border-bottom-color:var(--teal)}
.footer-meta #contactEmail{color:var(--cyan)}
.footer-meta #contactEmail:hover{color:var(--teal)}
.footer-meta .sep{color:var(--muted-2);opacity:.6}
@media (max-width:560px){ .footer-meta .sep{display:none} }
.footer-bottom{
  max-width:var(--maxw);margin:0 auto;
  display:flex;align-items:center;justify-content:space-between;gap:1rem;flex-wrap:wrap;
  padding:1.6rem clamp(1rem,4vw,2.5rem);border-top:1px solid var(--line);
}
.social a{color:var(--muted);transition:.2s}
.social a:hover{color:var(--teal)}
.copy{color:var(--muted-2);font-size:.85rem}

/* ============ Back to top ============ */
.to-top{
  position:fixed;right:clamp(1rem,3vw,2rem);bottom:clamp(1rem,3vw,2rem);z-index:60;
  width:50px;height:50px;border-radius:50%;cursor:pointer;
  display:grid;place-items:center;color:#04121b;
  background:var(--grad);border:none;
  box-shadow:0 12px 30px -8px rgba(46,230,200,.55);
  opacity:0;visibility:hidden;transform:translateY(16px) scale(.9);
  transition:opacity .25s ease, transform .25s ease, visibility .25s;
}
.to-top.show{opacity:1;visibility:visible;transform:translateY(0) scale(1)}
.to-top:hover{transform:translateY(-3px) scale(1.05);box-shadow:0 16px 38px -8px rgba(56,189,248,.65)}
.to-top:active{transform:translateY(0) scale(.96)}

/* ============ Responsive ============ */
@media (max-width:760px){
  .nav-links{
    position:fixed;inset:0 0 auto 0;top:60px;flex-direction:column;align-items:flex-start;
    gap:1.2rem;padding:1.5rem 2rem;background:rgba(7,11,24,.97);backdrop-filter:blur(14px);
    border-bottom:1px solid var(--line);transform:translateY(-130%);transition:.3s;
  }
  .nav-links.open{transform:translateY(0)}
  .nav-toggle{display:block}
  .about-grid{grid-template-columns:1fr}
  .section-head{align-items:flex-start}
}
@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important;scroll-behavior:auto!important}
  #net-bg{display:none}
}