/* ==========================================================================
       1. GLOBAL VARIABLES & BASE STYLES (From CD2.html)
       ========================================================================== */
    *, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

    :root {
      --bg: #0a0a0f;
      --surface: rgba(19, 18, 18, 0.881);
      --border: rgba(255,255,255,0.07);
      --text: #e8e6f0;
      --muted: #7a7890;
      --accent: #c8f060;
      --accent2: #7b6cff;
      --accent3: #ff6b8a;
      --card-bg: #14141e;
    }

    html { scroll-behavior: smooth; }

    body {
      font-family: 'DM Sans', sans-serif;
      background: var(--bg);
      color: var(--text);
      overflow-x: hidden;
      cursor: none; /* For custom cursor */
      line-height: 1.7;
    }

    /* ── Noise Overlay ── */
    body::before {
      content: '';
      position: fixed; inset: 0;
      background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.03'/%3E%3C/svg%3E");
      pointer-events: none; z-index: 1000; opacity: 0.4;
    }

    /* ── Custom Cursor ── */
    #cursor {
      position: fixed; top: 0; left: 0; width: 12px; height: 12px;
      background: var(--accent); border-radius: 50%;
      pointer-events: none; z-index: 9999;
      transition: transform 0.15s ease, width 0.25s ease, height 0.25s ease, background 0.2s;
      transform: translate(-50%, -50%);
    }
    #cursor-ring {
      position: fixed; top: 0; left: 0; width: 36px; height: 36px;
      border: 1.5px solid rgba(200,240,96,0.4); border-radius: 50%;
      pointer-events: none; z-index: 9998;
      transform: translate(-50%, -50%);
      transition: transform 0.08s linear, width 0.25s ease, height 0.25s ease, border-color 0.2s;
    }

    /* ==========================================================================
       2. NAVIGATION
       ========================================================================== */
    nav {
      position: fixed; top: 0; width: 100%;
      padding: 24px 60px;
      display: flex; justify-content: space-between; align-items: center;
      z-index: 100;
      background: rgba(10,10,15,0.85);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border);
    }
    .nav-logo { 
      font-family: 'Syne', sans-serif; font-weight: 800; font-size: 1.1rem;
      color: var(--text); text-decoration: none; letter-spacing: -0.02em;
    }
    .nav-logo span { color: var(--accent); }
    .back-link {
      font-size: 0.85rem; font-weight: 500; color: var(--muted);
      text-decoration: none; text-transform: uppercase; letter-spacing: 0.04em;
      transition: color 0.2s; display: flex; align-items: center; gap: 8px;
    }
    .back-link:hover { color: var(--accent); }

    /* ==========================================================================
       3. HERO SECTION (Dark, Grid, Orbs)
       ========================================================================== */
    #cs-hero {
      position: relative;
      padding: 180px 60px 100px;
      overflow: hidden;
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
      border-bottom: 1px solid var(--border);
    }
    .hero-grid-bg {
      position: absolute; inset: 0;
      background-image:
        linear-gradient(rgba(255,255,255,0.025) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.025) 1px, transparent 1px);
      background-size: 80px 80px;
      mask-image: radial-gradient(ellipse 80% 60% at 50% 50%, black, transparent);
      z-index: 0;
    }
    .hero-orb {
      position: absolute; border-radius: 50%; filter: blur(80px); pointer-events: none; z-index: 0;
    }
    .orb1 {
      width: 400px; height: 400px;
      background: radial-gradient(circle, rgba(123,108,255,0.15), transparent 70%);
      top: -100px; left: -100px;
    }
    .orb2 {
      width: 500px; height: 500px;
      background: radial-gradient(circle, rgba(200,240,96,0.1), transparent 70%);
      bottom: -200px; right: -100px;
    }
    .cs-hero-content {
      position: relative; z-index: 2; max-width: 800px;
    }
    .cs-eyebrow {
      display: inline-block; font-size: 0.78rem; font-weight: 600;
      color: var(--accent); letter-spacing: 0.12em; text-transform: uppercase;
      margin-bottom: 24px; padding: 6px 16px;
      background: rgba(200,240,96,0.1); border-radius: 100px;
    }
    .cs-title {
      font-family: 'Syne', sans-serif; font-size: clamp(2.5rem, 5vw, 4rem);
      font-weight: 800; line-height: 1.1; letter-spacing: -0.02em; margin-bottom: 24px;
    }
    .cs-subtitle {
      font-size: 1.15rem; color: var(--muted); font-weight: 300; line-height: 1.6;
    }

    /* ==========================================================================
       4. MAIN TWO-COLUMN LAYOUT
       ========================================================================== */
    .cs-container {
      display: flex; max-width: 1300px; margin: 0 auto;
      padding: 80px 60px; gap: 80px; align-items: flex-start;
      position: relative; z-index: 2;
    }

    /* ── Left Sidebar (Sticky Index) ── */
    .cs-sidebar {
      flex: 0 0 240px;
      position: sticky; top: 140px; /* Sticks slightly below the nav */
    }
    .cs-sidebar-title {
      font-family: 'Syne', sans-serif; font-size: 0.9rem; font-weight: 700;
      color: var(--text); margin-bottom: 20px; text-transform: uppercase; letter-spacing: 0.05em;
    }
    .cs-nav-list { list-style: none; display: flex; flex-direction: column; gap: 8px; }
    .cs-nav-list a {
      text-decoration: none; color: var(--muted); font-size: 0.9rem;
      padding: 10px 16px; border-left: 2px solid var(--border);
      transition: all 0.3s ease; display: block;
    }
    .cs-nav-list a:hover { color: var(--text); background: rgba(255,255,255,0.02); }
    
    /* Active State injected by JS */
    .cs-nav-list a.active {
      color: var(--accent); border-left: 2px solid var(--accent);
      background: rgba(200,240,96,0.05); font-weight: 500;
    }

    /* ── Right Content Area ── */
    .cs-content {
      flex: 1; min-width: 0;
    }
    .cs-section {
      margin-bottom: 100px;
      scroll-margin-top: 140px; /* Prevents anchor links from hiding under top nav */
    }
    
    /* Typography inside content */
    .cs-section h2 {
      font-family: 'Syne', sans-serif; font-size: 2.2rem; font-weight: 700;
      color: var(--text); margin-bottom: 30px; letter-spacing: -0.02em;
      padding-bottom: 16px; border-bottom: 1px solid var(--border);
    }
    .cs-section h3 {
      font-family: 'Syne', sans-serif; font-size: 1.4rem; font-weight: 600;
      color: var(--text); margin: 40px 0 16px 0;
    }
    .cs-section p {
      color: var(--muted); font-size: 1.05rem; margin-bottom: 24px;
    }
    .cs-section ul {
      margin-bottom: 24px; padding-left: 20px; color: var(--muted); font-size: 1.05rem;
    }
    .cs-section li { margin-bottom: 10px; }
    .cs-section li strong { color: var(--text); }

    /* ── Highlight / Callout Box ── */
    .cs-callout {
      background: var(--card-bg); border: 1px solid var(--border);
      border-radius: 16px; padding: 32px; margin-bottom: 40px;
      display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 30px;
      position: relative; overflow: hidden;
    }
    /* Subtle glow line at top of callout */
    .cs-callout::before {
      content: ''; position: absolute; top: 0; left: 0; right: 0; height: 2px;
      background: linear-gradient(90deg, var(--accent2), var(--accent));
    }
    .callout-item .label {
      font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.08em;
      color: var(--muted); margin-bottom: 8px; font-weight: 600;
    }
    .callout-item .value { font-size: 1rem; color: var(--text); font-weight: 500; }

    /* ── Image Placeholders ── */
    .img-placeholder {
      width: 100%; height: 400px;
      background: rgba(255,255,255,0.02); border: 1px solid var(--border);
      border-radius: 16px; display: flex; align-items: center; justify-content: center;
      color: var(--muted); font-size: 0.9rem; letter-spacing: 0.05em;
      margin: 40px 0;
    }
    .img-placeholder img {
      width: 100%; height: 100%; object-fit: cover; border-radius: 16px;
    }

    /* ==========================================================================
       5. RESPONSIVE DESIGN
       ========================================================================== */
    @media (max-width: 1024px) {
      .cs-container { padding: 60px 40px; gap: 40px; }
    }
    @media (max-width: 850px) {
      .cs-container { flex-direction: column; padding: 40px 24px; gap: 0;}
      
      /* Sidebar becomes horizontal scrollable nav on mobile */
      .cs-sidebar {
        width: 100%; position: sticky; top: 80px; background: var(--bg);
        padding: 10px 0 20px 0; z-index: 50; border-bottom: 1px solid var(--border);
        margin-bottom: 40px;
      }
      .cs-sidebar-title { display: none; }
      .cs-nav-list { flex-direction: row; overflow-x: auto; padding-bottom: 10px; gap: 16px;}
      .cs-nav-list a { 
        white-space: nowrap; border-left: none; border-bottom: 2px solid transparent; 
        padding: 8px 4px;
      }
      .cs-nav-list a.active { border-left: none; border-bottom: 2px solid var(--accent); background: transparent; }
      
      #cs-hero { padding: 140px 24px 60px; }
      nav { padding: 20px 24px; }
    }