/* ===== Global Styles ===== */
        :root {
            --primary: #2563eb;
            --secondary: #7c3aed;
            --dark: #1e293b;
            --light: #f8fafc;
            --accent: #ec4899;
            --success: #10b981;
            --warning: #f59e0b;
            --danger: #ef4444;
            --radius: 12px;
            --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
            --transition: all 0.3s ease;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
            line-height: 1.6;
            color: var(--dark);
            background-color: var(--light);
            transition: var(--transition);
        }

        /* ===== Typography ===== */
        h1, h2, h3, h4 {
            font-family: 'Poppins', sans-serif;
            font-weight: 700;
            line-height: 1.2;
            margin-bottom: 1rem;
        }

        h1 {
            font-size: 2.5rem;
            background: linear-gradient(90deg, var(--primary), var(--accent));
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
        }

        h2 {
            font-size: 2rem;
            margin-top: 2.5rem;
            position: relative;
            padding-bottom: 0.5rem;
        }

        h2::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 60px;
            height: 4px;
            background: linear-gradient(90deg, var(--primary), var(--accent));
            border-radius: 2px;
        }

        p {
            margin-bottom: 1.5rem;
        }

        /* ===== Layout ===== */
        .container {
            width: 90%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 2rem 0;
        }

        header {
            background-color: white;
            box-shadow: var(--shadow);
            position: flexible;
            top: 0;
            z-index: 1000;
            padding: 1rem 0;
            height:160px;
        }

        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .logo {
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--primary);
        }
        /* ===== Navigation Styles ===== */
nav {
  display: flex;
  align-items: center;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 1.5rem;
  margin: 0;
  padding: 0;
}

.nav-links li {
  position: relative;
}

.nav-links a {
  color: var(--text-color);
  font-weight: 500;
  padding: 0.5rem 0;
  position: relative;
  text-decoration: none;
  transition: var(--transition);
}

.nav-links a:hover,
.nav-links a:focus {
  color: var(--primary-color);
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--primary-color);
  transition: var(--transition);
}

.nav-links a:hover::after,
.nav-links a:focus::after {
  width: 100%;
}

/* Hamburger menu - hidden by default */
.hamburger {
  display: none;
  cursor: pointer;
  font-size: 1.8rem;
  color: var(--text-color);
  padding: 0.5rem;
}

/* ===== Mobile Navigation Styles ===== */
@media only screen and (max-width: 768px) {
  /* Show hamburger only on Android devices */
  @supports (-webkit-touch-callout: none) {
    .hamburger {
      display: block;
      z-index: 1001;
    }
  }

  .nav-links {
    position: fixed;
    top: 80px; /* Match header height */
    left: 0;
    width: 100%;
    background-color: var(--nav-bg);
    backdrop-filter: blur(10px);
    flex-direction: column;
    align-items: center;
    padding: 2rem 0;
    gap: 1.5rem;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
    transform: translateY(-150%);
    opacity: 0;
    transition: transform 0.3s ease-out, opacity 0.3s ease-out;
    z-index: 1000;
  }

  .nav-links.active {
    transform: translateY(0);
    opacity: 1;
  }

  
  
}

/* ===== Dark Mode Adjustments ===== */
body.dark-mode .nav-links {
  background-color: var(--dark-nav-bg);
}

body.dark-mode .nav-links a {
  color: var(--dark-text);
}

body.dark-mode .nav-links a:hover {
  color: var(--dark-primary);
}

body.dark-mode .hamburger {
  color: var(--dark-text);
}

        /* ===== AI Knowledge Sections ===== */
        .hero {
            text-align: center;
            padding: 4rem 0;
            background: linear-gradient(135deg, #f3f4f6, #e5e7eb);
            border-radius: var(--radius);
            margin: 2rem 0;
        }

        .ai-definition {
            background-color: white;
            padding: 2rem;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            margin: 2rem 0;
            border-left: 4px solid var(--primary);
        }

        .ai-types {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 1.5rem;
            margin: 2rem 0;
        }

        .ai-type-card {
            background-color: white;
            border-radius: var(--radius);
            padding: 1.5rem;
            box-shadow: var(--shadow);
            transition: var(--transition);
        }

        .ai-type-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
        }

        .ai-type-card h3 {
            color: var(--primary);
        }

        .ai-timeline {
            position: relative;
            padding-left: 2rem;
            margin: 3rem 0;
        }

        .ai-timeline::before {
            content: '';
            position: absolute;
            top: 0;
            left: 7px;
            height: 100%;
            width: 2px;
            background: linear-gradient(to bottom, var(--primary), var(--accent));
        }

        .timeline-item {
            position: relative;
            padding-bottom: 2rem;
            padding-left: 2rem;
        }

        .timeline-item::before {
            content: '';
            position: absolute;
            left: -10px;
            top: 5px;
            width: 20px;
            height: 20px;
            border-radius: 50%;
            background: var(--primary);
        }

        /* ===== Interactive Elements ===== */
        .ai-applications {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 1rem;
            margin: 2rem 0;
        }

        .application-card {
            background-color: white;
            border-radius: var(--radius);
            padding: 1.5rem;
            box-shadow: var(--shadow);
            transition: var(--transition);
            cursor: pointer;
        }

        .application-card:hover {
            transform: scale(1.03);
            box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
        }

        .application-card h4 {
            color: var(--secondary);
        }

        /* ===== Dark Mode ===== */
        .dark-mode {
            --dark: #f8fafc;
            --light: #1e293b;
        }

        body.dark-mode {
            background-color: var(--light);
            color: var(--dark);
        }

        body.dark-mode .ai-definition,
        body.dark-mode .ai-type-card,
        body.dark-mode .application-card {
            background-color: #334155;
            color: white;
        }

        .theme-toggle {
            background: none;
            border: none;
            cursor: pointer;
            font-size: 1.5rem;
        }
                /* ===== Responsive Design ===== */
        @media (max-width: 768px) {
            h1 {
                font-size: 2rem;
            } 
            
            h2 {
                font-size: 1.5rem;
            }
            
            .ai-types {
                grid-template-columns: 1fr;
            }
        }

        /* ===== Animations ===== */
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(20px); }
            to { opacity: 1; transform: translateY(0); }
        }

        .animated {
            animation: fadeIn 0.6s ease-out forwards;
        }

        /* ===== Footer ===== */
        footer {
            background-color: var(--dark);
            color: white;
            padding: 2rem 0;
            text-align: center;
            margin-top: 3rem;
        }