:root{
    --navy:#00243b;
    --red:#e80a00;
    --orange-red:#f93c00;
    --orange:#d97706;
    --light-blue:#88b2c8;
    --bg:#ffffff;
    --panel:#f8f9fa;
    --text:#00243b;
    --text-secondary:#00243b;
    --muted:#5a7a8f;
    --accent:var(--red);
    --accent-secondary:var(--orange-red);
    --accent-light:var(--orange);
    --glass: rgba(0,36,59,0.03);
    --border:rgba(0,36,59,0.12);
    --card-bg:#ffffff;
    --card-border:rgba(136,178,200,0.4);
    --code-bg:rgba(0,36,59,0.05);
    --max-width:1200px;
    --gap:1rem;
    --radius:12px;
    font-family:-apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  }
  *{box-sizing:border-box;margin:0;padding:0}
  body{
    margin:0;
    background:linear-gradient(180deg, #ffffff 0%, #f0f4f7 100%);
    color:var(--text);
    -webkit-font-smoothing:antialiased;
    -moz-osx-font-smoothing:grayscale;
    line-height:1.6;
  }
  h1,h2,h3,h4{line-height:1.2;margin-bottom:1rem}
  h1{font-size:2.5rem;font-weight:700}
  h2{font-size:2rem;font-weight:600;margin-top:1.5rem}
  h3{font-size:1.3rem;font-weight:600}
  h4{font-size:1.1rem;font-weight:600}
  p{margin-bottom:1rem}
  ul{margin-left:1.5rem}
  a{color:var(--accent-light);transition:color 0.2s}
  a:hover{color:var(--orange-red)}
  .wrap{max-width:var(--max-width);margin:0 auto;padding:1.5rem 2rem}

  /* Header Styles */
  .site-header{border-bottom:1px solid var(--border);background:var(--bg)}
  .site-header > .wrap{display:flex;align-items:center;justify-content:space-between;padding:1.2rem 2rem 0.8rem 2rem}

  .brand{text-decoration:none;display:flex;align-items:center;gap:0.6rem;font-size:1.5rem}
  .brand-logo{color:var(--orange);font-family:'Courier New', monospace;font-weight:700;font-size:2.5rem;letter-spacing:-0.5px}
  .brand-separator{color:var(--orange);font-weight:400;margin:0 0.4rem;font-size:1.8rem}
  .brand-title{color:var(--text);font-weight:400;font-size:1.5rem}

  .header-right{display:flex;align-items:center;gap:1.5rem}
  .clab-logo-link{display:flex;align-items:center;transition:opacity 0.2s}
  .clab-logo-link:hover{opacity:0.8}
  .clab-logo{height:80px;width:auto}

  .header-bottom{display:flex;align-items:center;gap:3rem;padding:0.8rem 2rem;border-top:1px solid var(--border)}

  .main-nav{display:flex;gap:1.5rem;align-items:center;order:1}
  .main-nav a{color:var(--muted);text-decoration:none;font-size:0.9rem;font-weight:500;transition:color 0.2s}
  .main-nav a:hover{color:var(--text)}

  .header-links{display:flex;gap:0.8rem;order:2;margin-left:auto}
  .header-btn{display:inline-flex;align-items:center;gap:0.4rem;padding:0.5rem 1rem;background:var(--card-bg);border:1px solid var(--card-border);border-radius:6px;color:var(--text);text-decoration:none;font-size:0.9rem;font-weight:500;transition:all 0.2s}
  .header-btn:hover{background:var(--glass);border-color:var(--maroon);color:var(--text)}
  .btn-icon{font-size:1rem;line-height:1}

  .mobile-menu-btn{display:none;background:none;border:0;color:var(--muted);font-size:1.2rem;cursor:pointer}
  
  .hero{padding:3rem 0 2rem 0}
  .hero-grid{display:grid;grid-template-columns:1.3fr 1fr;gap:3rem;align-items:start}
  .hero h1{font-size:2.8rem;margin-bottom:1.2rem;line-height:1.1}
  .lead{color:var(--muted);margin-top:0;font-size:1.15rem;line-height:1.6;margin-bottom:2rem}
  .brand-name{color:var(--orange);font-family:'Courier New', monospace;font-weight:700;font-size:1.2rem}
  .stats{display:flex;gap:1.5rem;margin:2rem 0}
  .stats div{background:var(--card-bg);border:2px solid var(--light-blue);padding:1rem 1.5rem;border-radius:8px;text-align:left}
  .stats strong{display:block;font-size:1.8rem;color:var(--orange);font-weight:700;margin-bottom:0.3rem}
  .stats span{color:var(--muted);font-size:0.9rem}
  .hero-links{display:flex;gap:1rem;margin-top:2rem}
  .btn{display:inline-block;padding:0.75rem 1.5rem;border-radius:8px;text-decoration:none;font-weight:600;transition:all 0.2s;border:none;cursor:pointer}
  .btn-primary{background:var(--light-blue);color:var(--navy)}
  .btn-primary:hover{background:var(--orange);color:var(--navy);transform:translateY(-2px);box-shadow:0 4px 12px rgba(136,178,200,0.3)}
  .btn-secondary{background:transparent;color:var(--muted);border:1px solid var(--light-blue)}
  .btn-secondary:hover{color:var(--navy);border-color:var(--orange);background:var(--glass)}
  .leaderboard-card{background:var(--card-bg);padding:1.5rem;border-radius:12px;border:2px solid var(--light-blue)}
  .leaderboard-card h2{font-size:1.4rem;margin:0 0 0.3rem 0}
  .card-subtitle{color:var(--muted);font-size:0.85rem;margin-bottom:1.2rem}
  .leaderboard-list{list-style:none;padding:0;margin:0 0 1rem 0}
  .leaderboard-list li{display:flex;align-items:center;gap:0.6rem;padding:0.7rem 0;border-bottom:1px solid var(--border)}
  .leaderboard-list li:last-child{border:none}
  .leaderboard-list .rank-display{min-width:1.5rem;text-align:left;font-size:1rem}
  .leaderboard-list strong{color:var(--navy);flex:1;text-align:left}
  .leaderboard-list span:last-child{color:var(--orange);font-weight:600;margin-left:auto}
  .view-full{color:var(--accent-light);text-decoration:none;font-size:0.9rem;font-weight:500}
  .view-full:hover{text-decoration:underline}
  /* About Section */
  .about{margin:1.5rem auto;padding-top:1.5rem}
  .about h2{text-align:center;margin-bottom:2rem;margin-top:0}
  .about-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:2rem}
  .about-card{background:var(--card-bg);border:1px solid var(--card-border);padding:2rem;border-radius:12px}
  .about-card h3{color:var(--orange);margin-bottom:1rem}
  .task-list{list-style:none;margin:0;padding:0}
  .task-list li{margin-bottom:1rem;padding-left:0}
  .task-list strong{color:var(--orange)}

  /* Filters & Tabs */
  .filters{padding:1.5rem 0 1rem 0}
  .filters h2{margin-bottom:1.5rem;margin-top:0}
  .tabs{display:flex;gap:0.8rem;flex-wrap:wrap}
  .tab{background:transparent;border:1px solid var(--card-border);padding:0.7rem 1.2rem;border-radius:8px;color:var(--muted);cursor:pointer;font-size:0.95rem;font-weight:500;transition:all 0.2s}
  .tab:hover{border-color:var(--orange);color:var(--text)}
  .tab.active{background:var(--light-blue);border-color:var(--light-blue);color:var(--navy);box-shadow:0 4px 12px rgba(136,178,200,0.2)}

  /* Examples Section */
  .examples{display:grid;grid-template-columns:repeat(auto-fit,minmax(320px,1fr));gap:1.5rem;padding:1rem 0 2rem 0}
  .example-card{background:var(--card-bg);border:1px solid var(--card-border);padding:1.5rem;border-radius:12px;transition:all 0.2s}
  .example-card:hover{border-color:var(--orange);transform:translateY(-2px)}
  .example-card h3{margin:0 0 1rem 0;font-size:1.1rem;color:var(--text)}
  .example-type{display:inline-block;background:rgba(136,178,200,0.2);color:var(--light-blue);padding:0.3rem 0.8rem;border-radius:6px;font-size:0.8rem;font-weight:600;margin-bottom:1rem}
  .example-text{background:var(--code-bg);padding:1rem;border-radius:6px;font-family:monospace;font-size:0.9rem;margin:0.5rem 0;line-height:1.5;border-left:3px solid var(--light-blue);color:var(--text)}

  /* Leaderboard Table */
  .leaderboard-section{margin:1.5rem auto;padding:1.5rem 0 2rem 0}
  .leaderboard-section h2{margin-bottom:2rem;margin-top:0}
  .leaderboard-table-container{overflow-x:auto}
  .leaderboard-table{width:100%;border-collapse:collapse;background:var(--card-bg);border-radius:12px;overflow:hidden}
  .leaderboard-table th,.leaderboard-table td{padding:1rem 1.5rem;text-align:left;border-bottom:1px solid var(--border)}
  .leaderboard-table thead{background:rgba(136,178,200,0.15)}
  .leaderboard-table th{font-weight:600;color:var(--light-blue);text-transform:uppercase;font-size:0.85rem;letter-spacing:0.5px}
  .leaderboard-table tbody tr:hover{background:var(--glass)}
  .leaderboard-table tbody tr:last-child td{border-bottom:none}
  .leaderboard-table td{color:var(--text)}

  /* Footer */
  .site-footer{border-top:1px solid var(--border);padding:3rem 0 2rem 0;margin-top:4rem;background:var(--panel)}
  .footer-content{display:grid;grid-template-columns:repeat(3,1fr);gap:3rem;margin-bottom:2rem}
  .footer-section h4{color:var(--orange);margin-bottom:1rem;font-size:1rem}
  .footer-section p,.footer-section li{color:var(--muted);font-size:0.9rem;line-height:1.6}
  .footer-links{list-style:none;margin:0;padding:0}
  .footer-links li{margin-bottom:0.5rem}
  .footer-links a{color:var(--muted);text-decoration:none}
  .footer-links a:hover{color:var(--orange)}
  .citation{background:var(--code-bg);padding:1rem;border-radius:6px;font-size:0.8rem;overflow-x:auto;border-left:3px solid var(--light-blue);font-family:monospace;line-height:1.5;color:var(--text)}
  .footer-credit{text-align:center;color:var(--muted);font-size:0.85rem;border-top:1px solid var(--border);padding-top:2rem}
  
  /* Responsive */
  @media (max-width:980px){
    .hero-grid{grid-template-columns:1fr}
    .about-grid{grid-template-columns:1fr}
    .footer-content{grid-template-columns:1fr}
    .examples{grid-template-columns:1fr}
    .header-bottom{flex-direction:column;gap:1rem;align-items:flex-start}
    .header-links{width:100%;margin-left:0}
    .main-nav{width:100%;justify-content:space-between;order:2}
    .header-links{order:1}
    .mobile-menu-btn{display:block}
    .stats{flex-direction:column}
    .hero h1{font-size:2rem}
    .wrap{padding:1rem}
    .brand-title{display:none}
    .clab-logo{height:60px}
  }
  @media (max-width:640px){
    .hero h1{font-size:1.8rem}
    .lead{font-size:1rem}
    .tabs{flex-direction:column;width:100%}
    .tab{width:100%}
    .leaderboard-table{font-size:0.85rem}
    .leaderboard-table th,.leaderboard-table td{padding:0.75rem 1rem}
    .header-links{flex-direction:column;width:100%}
    .header-btn{width:100%;justify-content:center}
    .site-header > .wrap,.header-bottom{padding-left:1rem;padding-right:1rem}
  }