*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
  :root{--void:#030712;--gold:#c8a96e;--gold-dim:#8a7048;--ice:#7dd3fc;--violet:#a78bfa;--white:#f0f4ff;--muted:#8899bb;--card-bg:rgba(14,26,52,0.82);--border:rgba(167,139,250,0.15)}
  html{scroll-behavior:smooth}
  body{font-family:'Inter',sans-serif;background:var(--void);color:var(--white);min-height:100vh;overflow-x:hidden}
  nav{position:fixed;top:0;left:0;right:0;z-index:100;display:flex;align-items:center;justify-content:space-between;padding:0 2.5rem;height:64px;background:rgba(3,7,18,.8);backdrop-filter:blur(20px);border-bottom:1px solid var(--border)}
  .nav-logo{font-family:'Orbitron',monospace;font-size:.9rem;font-weight:700;color:var(--white);letter-spacing:.08em;display:flex;align-items:center;gap:.7rem;text-decoration:none}
  .nav-logo-icon{font-size:1.1rem;animation:spin-slow 20s linear infinite;display:inline-block}

  .hero-photo { position:relative; z-index:2; margin-bottom:1.5rem; }
  .hero-photo img { width:130px; height:130px; border-radius:50%; object-fit:cover; object-position:center top; border:3px solid rgba(167,139,250,.5); box-shadow:0 0 40px rgba(167,139,250,.3), 0 0 0 6px rgba(167,139,250,.08); }
  @keyframes spin-slow{to{transform:rotate(360deg)}}
  .nav-links{display:flex;align-items:center;gap:2rem;list-style:none}
  .nav-links a{font-size:.7rem;font-family:'Orbitron',monospace;letter-spacing:.1em;color:var(--muted);text-decoration:none;text-transform:uppercase;transition:color .2s}
  .nav-links a:hover{color:var(--violet)}
  .hero{position:relative;height:85vh;min-height:500px;display:flex;align-items:center;justify-content:center;overflow:hidden}
  .hero-bg{position:absolute;inset:0;background-image:url('https://upload.wikimedia.org/wikipedia/commons/thumb/c/c2/Solar_sys8.jpg/1920px-Solar_sys8.jpg');background-size:cover;background-position:center 30%;filter:brightness(.35) saturate(1.3);transform:scale(1.05);z-index:0}
  .hero-glow{position:absolute;width:700px;height:700px;border-radius:50%;background:radial-gradient(circle,rgba(124,58,237,.14) 0%,transparent 70%);top:45%;left:50%;transform:translate(-50%,-55%);z-index:1;pointer-events:none}
  .hero-overlay{position:absolute;inset:0;background:linear-gradient(to bottom,rgba(3,7,18,.25) 0%,rgba(3,7,18,0) 35%,rgba(3,7,18,.85) 85%,rgba(3,7,18,1) 100%);z-index:1}
  .hero-content{position:relative;z-index:2;text-align:center;padding:0 1.5rem}
  .hero-eyebrow{font-family:'Orbitron',monospace;font-size:.62rem;letter-spacing:.4em;color:var(--violet);text-transform:uppercase;display:block;margin-bottom:1.2rem}
  .hero-title{font-family:'Orbitron',monospace;font-size:clamp(2rem,5.5vw,4.8rem);font-weight:900;line-height:1.05;background:linear-gradient(135deg,#fff 0%,var(--violet) 50%,var(--gold) 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;margin-bottom:1rem}
  .hero-sub{font-size:clamp(.9rem,2vw,1.1rem);color:var(--muted);font-weight:300;max-width:520px;margin:0 auto 2.5rem;line-height:1.7}
  .hero-sub em{color:var(--gold);font-style:normal}
  .hero-cta{display:inline-flex;align-items:center;gap:.6rem;background:rgba(167,139,250,.1);border:1px solid rgba(167,139,250,.35);color:var(--violet);font-family:'Orbitron',monospace;font-size:.72rem;letter-spacing:.15em;padding:.75rem 1.8rem;border-radius:2px;text-decoration:none;transition:all .3s}
  .hero-cta:hover{background:rgba(167,139,250,.2);box-shadow:0 0 28px rgba(167,139,250,.3);transform:translateY(-2px)}
  .scroll-hint{position:absolute;bottom:2rem;left:50%;transform:translateX(-50%);z-index:2;display:flex;flex-direction:column;align-items:center;gap:.4rem;color:var(--muted);font-size:.6rem;letter-spacing:.2em;text-transform:uppercase;animation:bounce 2s infinite}
  @keyframes bounce{0%,100%{transform:translateX(-50%) translateY(0)}50%{transform:translateX(-50%) translateY(7px)}}
  main{position:relative;z-index:2;background:var(--void);padding:5rem 0 6rem}
  .container{max-width:1300px;margin:0 auto;padding:0 2rem}
  .search-section{text-align:center;margin-bottom:3.5rem}
  .search-label{font-family:'Orbitron',monospace;font-size:.6rem;letter-spacing:.38em;color:var(--gold);text-transform:uppercase;display:block;margin-bottom:1.2rem}
  .search-wrapper{position:relative;max-width:620px;margin:0 auto}
  .search-icon{position:absolute;left:1.2rem;top:50%;transform:translateY(-50%);color:var(--muted);pointer-events:none}
  #searchInput{width:100%;background:rgba(20,10,40,.9);border:1px solid rgba(167,139,250,.2);border-radius:3px;color:var(--white);font-family:'Inter',sans-serif;font-size:1rem;padding:1rem 2.5rem 1rem 3rem;outline:none;transition:border-color .3s,box-shadow .3s}
  #searchInput::placeholder{color:var(--muted)}
  #searchInput:focus{border-color:rgba(167,139,250,.5);box-shadow:0 0 0 3px rgba(167,139,250,.08)}
  .search-clear{position:absolute;right:1rem;top:50%;transform:translateY(-50%);background:none;border:none;color:var(--muted);cursor:pointer;font-size:1rem;display:none}
  .search-clear.visible{display:block}
  #searchCount{margin-top:.85rem;font-size:.72rem;color:var(--muted);min-height:1.2em;font-family:'Orbitron',monospace;letter-spacing:.06em}
  .videos-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:2rem;padding-bottom:1rem;border-bottom:1px solid var(--border)}
  .videos-title{font-family:'Orbitron',monospace;font-size:.9rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase}
  .videos-count{font-family:'Orbitron',monospace;font-size:.6rem;letter-spacing:.1em;color:var(--gold);background:rgba(200,169,110,.08);border:1px solid rgba(200,169,110,.2);padding:.3rem .75rem;border-radius:2px}
  .video-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(370px,1fr));gap:1.5rem}
  .video-card{background:var(--card-bg);border:1px solid var(--border);border-radius:4px;overflow:hidden;transition:transform .3s,border-color .3s,box-shadow .3s}
  .video-card:hover{transform:translateY(-5px);border-color:rgba(167,139,250,.35);box-shadow:0 16px 48px rgba(0,0,0,.55)}
  .video-card.hidden{display:none}
  .video-embed{position:relative;padding-bottom:56.25%;background:#000}
  .video-embed iframe{position:absolute;inset:0;width:100%;height:100%;border:none}
  .video-info{padding:1.2rem 1.4rem .9rem}
  .video-title{font-size:.95rem;font-weight:600;color:var(--white);line-height:1.45;margin-bottom:.5rem}
  .video-topics{font-size:.7rem;color:var(--muted);line-height:1.5;margin-bottom:1rem;font-style:italic;border-left:2px solid rgba(167,139,250,.25);padding-left:.75rem}
  .chapters-toggle{width:100%;display:flex;align-items:center;justify-content:space-between;background:rgba(167,139,250,.06);border:1px solid rgba(167,139,250,.18);border-radius:2px;padding:.65rem .9rem;color:var(--violet);font-family:'Orbitron',monospace;font-size:.6rem;letter-spacing:.12em;text-transform:uppercase;cursor:pointer;transition:background .2s}
  .chapters-toggle:hover{background:rgba(167,139,250,.12)}
  .chapters-toggle svg{transition:transform .3s}
  .chapters-toggle.open svg{transform:rotate(180deg)}
  .chapters-list{display:none}
  .chapters-list.open{display:block}
  .chapter-item{display:flex;align-items:flex-start;gap:.75rem;padding:.65rem .9rem;border-bottom:1px solid rgba(167,139,250,.07);text-decoration:none;transition:background .2s}
  .chapter-item:last-child{border-bottom:none}
  .chapter-item:hover{background:rgba(167,139,250,.07)}
  .chapter-time{font-family:'Orbitron',monospace;font-size:.6rem;color:var(--gold);white-space:nowrap;padding-top:.12rem;min-width:38px}
  .chapter-label{font-size:.78rem;color:var(--muted);line-height:1.4;transition:color .2s}
  .chapter-item:hover .chapter-label{color:var(--white)}
  .chapter-play{margin-left:auto;color:var(--violet);opacity:0;transition:opacity .2s;flex-shrink:0;padding-top:.15rem}
  .chapter-item:hover .chapter-play{opacity:1}
  mark{background:rgba(200,169,110,.28);color:var(--gold);border-radius:2px;padding:0 2px}
  .no-results{text-align:center;padding:4rem 2rem;display:none}
  .no-results.visible{display:block}
  .no-results h3{font-family:'Orbitron',monospace;font-size:1rem;color:var(--muted);margin-bottom:.5rem}
  footer{text-align:center;padding:2.5rem;border-top:1px solid rgba(167,139,250,.1);font-size:.65rem;color:var(--muted);font-family:'Orbitron',monospace;letter-spacing:.1em}
  @media(max-width:700px){nav{padding:0 1.2rem}.nav-links{display:none}.container{padding:0 1rem}.hero-title{font-size:2rem}.video-grid{grid-template-columns:1fr}}