:root {
      /* Refined Palette */
      --brand-primary: #4f46e5;       /* Indigo 600 */
      --brand-hover: #4338ca;         /* Indigo 700 */
      --brand-light: #eef2ff;         /* Indigo 50 */
      --accent: #0ea5e9;              /* Sky 500 */
      
      --text-main: #0f172a;           /* Slate 900 */
      --text-muted: #64748b;          /* Slate 500 */
      
      --surface-bg: #f8fafc;          /* Slate 50 */
      --surface-card: #ffffff;
      
      --radius-sm: 0.5rem;
      --radius-md: 0.75rem;
      --radius-lg: 1rem;
      --radius-xl: 1.5rem;
      
      --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
      --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
      --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
      --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    }

    body {
      font-family: 'Inter', sans-serif;
      color: var(--text-main);
      background-color: var(--surface-bg);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

    h1, h2, h3, h4, h5, h6 {
      color: var(--text-main);
      font-weight: 700;
      letter-spacing: -0.025em;
    }

    a { text-decoration: none; color: inherit; transition: color 0.2s; }

    /* Button Styling */
    .btn {
      padding: 0.625rem 1.25rem;
      font-weight: 600;
      border-radius: var(--radius-sm);
      transition: all 0.2s ease;
    }
    .btn-primary {
      background-color: var(--brand-primary);
      border-color: var(--brand-primary);
    }
    .btn-primary:hover {
      background-color: var(--brand-hover);
      border-color: var(--brand-hover);
      transform: translateY(-1px);
      box-shadow: 0 4px 12px rgba(79, 70, 229, 0.3);
    }
    .btn-outline-primary {
      color: var(--brand-primary);
      border-color: var(--brand-primary);
      background: transparent;
    }
    .btn-outline-primary:hover {
      background-color: var(--brand-light);
      color: var(--brand-primary);
      border-color: var(--brand-primary);
    }

    /* Navbar */
    .navbar {
      background: rgba(255, 255, 255, 0.85);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(226, 232, 240, 0.6);
      padding-top: 1rem;
      padding-bottom: 1rem;
    }
    .nav-link {
      font-weight: 500;
      color: var(--text-muted) !important;
      font-size: 0.95rem;
    }
    .nav-link:hover { color: var(--brand-primary) !important; }

    /* Hero Section */
    .hero-section {
      padding-top: 4rem;
      padding-bottom: 5rem;
      background: radial-gradient(circle at 10% 20%, rgba(79, 70, 229, 0.05) 0%, transparent 40%),
                  radial-gradient(circle at 90% 80%, rgba(14, 165, 233, 0.05) 0%, transparent 40%);
      overflow: hidden;
    }

    /* CSS Mockup Construction - Pure CSS CRM UI */
    .mockup-container {
      position: relative;
      perspective: 1000px;
    }
    .css-dashboard-ui {
      background: #fff;
      border-radius: var(--radius-lg);
      border: 1px solid #e2e8f0;
      box-shadow: var(--shadow-xl);
      display: flex;
      height: 420px;
      overflow: hidden;
      transform: rotateY(-5deg) rotateX(5deg);
      transition: transform 0.5s ease;
    }
    .css-dashboard-ui:hover {
      transform: rotateY(0deg) rotateX(0deg);
    }
    
    /* Mockup Sidebar */
    .ui-sidebar {
      width: 60px;
      background: #f8fafc;
      border-right: 1px solid #e2e8f0;
      padding: 1rem 0;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 1.25rem;
    }
    .ui-icon-dot { width: 36px; height: 36px; border-radius: 10px; background: #cbd5e1; }
    .ui-icon-dot.active { background: var(--brand-primary); box-shadow: 0 4px 6px rgba(79,70,229,0.3); }

    /* Mockup List */
    .ui-list {
      width: 220px;
      background: #fff;
      border-right: 1px solid #e2e8f0;
      display: flex;
      flex-direction: column;
    }
    .ui-list-header { height: 60px; border-bottom: 1px solid #e2e8f0; display: flex; align-items: center; padding: 0 1.5rem; font-weight: 700; font-size: 0.85rem; color: var(--text-main); }
    .ui-list-item { padding: 1rem; border-bottom: 1px solid #f1f5f9; display: flex; gap: 0.75rem; align-items: center; }
    .ui-list-item:nth-child(2) { background: var(--brand-light); border-left: 3px solid var(--brand-primary); } /* Selected State */
    .ui-avatar { width: 32px; height: 32px; background: #e2e8f0; border-radius: 50%; flex-shrink: 0; }
    .ui-text-lines { flex: 1; display: flex; flex-direction: column; gap: 6px; }
    .ui-line { height: 8px; background: #e2e8f0; border-radius: 4px; width: 80%; }
    .ui-line.short { width: 50%; }

    /* Mockup Chat Area */
    .ui-chat { flex: 1; display: flex; flex-direction: column; background: #fff; }
    .ui-chat-header { height: 60px; border-bottom: 1px solid #e2e8f0; padding: 0 1.5rem; display: flex; align-items: center; justify-content: space-between; }
    .ui-chat-body { flex: 1; padding: 1.5rem; background: #fafafa; display: flex; flex-direction: column; gap: 1rem; }
    
    /* Bubbles */
    .chat-bubble { max-width: 70%; padding: 1rem; border-radius: 12px; font-size: 0.8rem; line-height: 1.4; position: relative; }
    .chat-bubble.received { background: #fff; border: 1px solid #e2e8f0; border-bottom-left-radius: 2px; align-self: flex-start; color: var(--text-main); }
    .chat-bubble.sent { background: #dcfce7; border: 1px solid #bbf7d0; border-bottom-right-radius: 2px; align-self: flex-end; color: #14532d; }
    
    /* Mockup Tags inside chat */
    .ui-status-pill { padding: 4px 8px; background: #fee2e2; color: #991b1b; font-size: 10px; border-radius: 12px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.5px; }

    /* Floating Stats Cards */
    .float-stat {
      position: absolute;
      background: #fff;
      padding: 1rem;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-lg);
      border: 1px solid rgba(0,0,0,0.04);
      z-index: 2;
      animation: float 6s ease-in-out infinite;
      display: flex;
      align-items: center;
      gap: 1rem;
      min-width: 180px;
    }
    .float-stat i { font-size: 1.25rem; }
    .float-stat.top-right { top: 40px; right: -30px; }
    .float-stat.bottom-left { bottom: 60px; left: -30px; animation-delay: 2s; }

    @keyframes float { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-10px); } }

    /* Feature Cards */
    .feature-card {
      background: #fff;
      padding: 2rem;
      border-radius: var(--radius-lg);
      border: 1px solid #f1f5f9;
      transition: all 0.3s ease;
      height: 100%;
    }
    .feature-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-lg);
      border-color: rgba(79, 70, 229, 0.2);
    }
    .icon-square {
      width: 50px; height: 50px;
      background: var(--brand-light);
      color: var(--brand-primary);
      border-radius: 12px;
      display: flex; align-items: center; justify-content: center;
      font-size: 1.5rem;
      margin-bottom: 1.5rem;
    }

    /* Tabs Styling */
    .nav-pills .nav-link {
      color: var(--text-muted) !important;
      background: #fff;
      border: 1px solid #e2e8f0;
      margin-bottom: 0.5rem;
      border-radius: var(--radius-md);
      padding: 1rem 1.5rem;
      text-align: left;
      font-weight: 600;
      transition: all 0.2s;
    }
    .nav-pills .nav-link.active {
      background: var(--brand-primary) !important;
      color: #fff !important;
      border-color: var(--brand-primary);
      box-shadow: var(--shadow-md);
    }
    .nav-pills .nav-link i { margin-right: 10px; font-size: 1.1rem; }

    /* Integration Tiles */
    .integration-tile {
      background: #fff;
      border: 1px solid #e2e8f0;
      border-radius: var(--radius-lg);
      padding: 2rem;
      text-align: center;
      transition: all 0.3s ease;
    }
    .integration-tile:hover {
      box-shadow: var(--shadow-lg);
      border-color: var(--brand-primary);
      transform: translateY(-5px);
    }

    /* Comparison Table */
    .comparison-table {
      border-collapse: separate;
      border-spacing: 0;
      width: 100%;
      border: 1px solid #e2e8f0;
      border-radius: var(--radius-lg);
      overflow: hidden;
    }
    .comparison-table th, .comparison-table td { padding: 1.25rem; border-bottom: 1px solid #e2e8f0; }
    .comparison-table th { background: #f8fafc; font-weight: 700; color: var(--text-main); }
    .comparison-table .brand-col { background: var(--brand-light); color: var(--brand-primary); font-weight: 700; border-left: 1px solid #e0e7ff; border-right: 1px solid #e0e7ff; }

    /* Accordion */
    .accordion-item { border: 1px solid #e2e8f0; margin-bottom: 0.5rem; border-radius: var(--radius-md) !important; overflow: hidden; }
    .accordion-button { font-weight: 600; color: var(--text-main); background: #fff; box-shadow: none !important; }
    .accordion-button:not(.collapsed) { color: var(--brand-primary); background: var(--brand-light); }

    /* Sections */
    section { padding: 5rem 0; scroll-margin-top: 80px; }
    .bg-soft { background-color: #f8fafc; }
    .section-header { max-width: 700px; margin: 0 auto 3rem auto; text-align: center; }
    
    /* Footer */
    footer { background: #fff; border-top: 1px solid #e2e8f0; font-size: 0.9rem; }
    footer h5 { font-size: 1rem; font-weight: 700; margin-bottom: 1.25rem; color: var(--text-main); }
    footer a { color: var(--text-muted); }
    footer a:hover { color: var(--brand-primary); }

    /* Utilities */
    .text-balance { text-wrap: balance; }
    .badge-soft { background: var(--brand-light); color: var(--brand-primary); font-weight: 600; padding: 0.5rem 1rem; border-radius: 50px; font-size: 0.85rem; }