body { background: #020617; color: #f1f5f9; padding-top: 80px; font-family: 'Segoe UI', sans-serif; }

  
  .kat-hero {
    background: radial-gradient(ellipse at 50% 0%, rgba(99,102,241,0.25) 0%, transparent 65%), #020617;
    padding: 60px 60px 50px;
    border-bottom: 1px solid rgba(255,255,255,0.07);
    text-align: center;
  }
  .kat-hero h1 { font-size: 38px; font-weight: 900; letter-spacing: -1px; margin-bottom: 10px; }
  .kat-hero h1 span { background: linear-gradient(135deg,#6366f1,#a855f7); -webkit-background-clip:text; -webkit-text-fill-color:transparent; background-clip:text; }
  .kat-hero p { color: #64748b; font-size: 15px; max-width: 480px; margin: 0 auto; }

  
  .kat-search-wrap {
    max-width: 500px; margin: 28px auto 0;
    position: relative;
  }
  .kat-search-wrap svg { position:absolute; left:14px; top:50%; transform:translateY(-50%); color:#64748b; }
  .kat-search-wrap input {
    width:100%; background:#0f172a; border:1px solid #1e293b; border-radius:40px;
    padding:12px 18px 12px 42px; color:#f1f5f9; font-size:14px; outline:none; transition:.2s;
  }
  .kat-search-wrap input:focus { border-color:#6366f1; box-shadow: 0 0 0 3px rgba(99,102,241,0.12); }

  
  .kat-body { max-width: 1200px; margin: 0 auto; padding: 48px 24px 80px; }

  
  .kat-section-title {
    font-size: 13px; font-weight: 700; text-transform: uppercase; letter-spacing: .08em;
    color: #6366f1; margin-bottom: 18px; display: flex; align-items: center; gap: 8px;
  }
  .kat-section-title::after { content:''; flex:1; height:1px; background:#1e293b; }

  
  .kat-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 16px; margin-bottom: 52px; }

  .kat-card {
    position: relative; border-radius: 16px; overflow: hidden;
    cursor: pointer; text-decoration: none; color: #f1f5f9;
    aspect-ratio: 4/3;
    display: flex; align-items: flex-end;
    transition: transform .2s, box-shadow .2s;
    border: 1px solid rgba(255,255,255,0.06);
  }
  .kat-card:hover { transform: translateY(-4px); box-shadow: 0 16px 48px rgba(0,0,0,0.5); }
  .kat-card-bg {
    position: absolute; inset: 0;
    background: var(--kat-bg);
    transition: transform .4s;
  }
  .kat-card:hover .kat-card-bg { transform: scale(1.06); }
  .kat-card-overlay {
    position: absolute; inset: 0;
    background: linear-gradient(to top, rgba(0,0,0,0.75) 0%, rgba(0,0,0,0.1) 60%);
  }
  .kat-card-body { position: relative; padding: 16px; z-index: 2; width: 100%; }
  .kat-card-icon { font-size: 28px; margin-bottom: 6px; display: block; }
  .kat-card-name { font-size: 15px; font-weight: 800; }
  .kat-card-count { font-size: 11px; color: rgba(255,255,255,0.55); margin-top: 2px; }
  .kat-card-badge {
    position: absolute; top: 12px; right: 12px;
    background: rgba(255,255,255,0.15); backdrop-filter:blur(8px);
    border: 1px solid rgba(255,255,255,0.2);
    border-radius: 20px; padding: 3px 10px; font-size: 11px; font-weight: 600;
    color: #fff; z-index: 2;
  }

  
  .filter-bar { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 28px; }
  .filter-btn {
    padding: 7px 18px; border-radius: 20px; font-size: 13px; font-weight: 600;
    border: 1px solid #1e293b; background: transparent; color: #94a3b8; cursor: pointer;
    transition: .18s;
  }
  .filter-btn:hover { border-color: #6366f1; color: #6366f1; }
  .filter-btn.active { background: #6366f1; border-color: #6366f1; color: #fff; }

  
  .kat-tracks-section { display: none; margin-top: 32px; }
  .kat-tracks-section.visible { display: block; }
  .back-btn {
    display: inline-flex; align-items: center; gap: 6px;
    background: #0f172a; border: 1px solid #1e293b; border-radius: 8px;
    color: #94a3b8; padding: 8px 16px; font-size: 13px; cursor: pointer;
    margin-bottom: 20px; transition: .15s; text-decoration: none;
  }
  .back-btn:hover { border-color: #334155; color: #f1f5f9; }
  .track-list-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 14px; }
  .track-card {
    background: #0f172a; border: 1px solid #1e293b; border-radius: 14px;
    padding: 16px; display: flex; gap: 14px; align-items: center;
    transition: border-color .15s;
  }
  .track-card:hover { border-color: #334155; }
  .track-thumb {
    width: 52px; height: 52px; flex-shrink: 0; border-radius: 10px;
    background: linear-gradient(135deg, #1e293b, #334155);
    display: flex; align-items: center; justify-content: center; font-size: 1.4rem;
    overflow: hidden;
  }
  .track-thumb img { width: 100%; height: 100%; object-fit: cover; border-radius: 10px; }
  .track-info { flex: 1; min-width: 0; }
  .track-title { font-size: 14px; font-weight: 700; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
  .track-artist { font-size: 12px; color: #64748b; margin-top: 2px; }
  .track-meta { display: flex; gap: 6px; margin-top: 6px; flex-wrap: wrap; }
  .track-tag { font-size: 10px; padding: 2px 8px; background: #1e293b; border-radius: 4px; color: #64748b; }
  .track-price { font-size: 14px; font-weight: 800; color: #a78bfa; flex-shrink: 0; }
  .track-price.free { color: #22c55e; }
  .play-btn {
    width: 36px; height: 36px; flex-shrink: 0;
    background: linear-gradient(135deg,#6366f1,#8b5cf6); border: none; border-radius: 50%;
    color: #fff; font-size: 13px; cursor: pointer; display: flex; align-items: center; justify-content: center;
    transition: .15s;
  }
  .play-btn:hover { opacity: .8; transform: scale(1.08); }

  
  .kat-loading, .kat-empty { text-align: center; padding: 60px 20px; color: #475569; }
  .kat-loading .spin { width: 32px; height: 32px; border: 3px solid #1e293b; border-top-color: #6366f1; border-radius: 50%; animation: spin .8s linear infinite; margin: 0 auto 12px; }
  @keyframes spin { to { transform: rotate(360deg); } }

  @media(max-width:640px) {
    .kat-hero { padding: 40px 20px 36px; }
    .kat-hero h1 { font-size: 26px; }
    .kat-body { padding: 32px 16px 60px; }
    .kat-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  }