:root {
            --primary: #3498db;
            --secondary: #2c3e50;
            --accent: #e74c3c;
            --light: #ecf0f1;
            --dark: #2c3e50;
            --success: #2ecc71;
            --warning: #f39c12;
            --danger: #e74c3c;
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.6;
            color: #333;
            background: linear-gradient(135deg, #1a2980, #26d0ce);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }
        
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 15px;
        }
        
        header {
            background-color: rgba(44, 62, 80, 0.9);
            color: white;
            padding: 1rem 0;
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
        }
        
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .logo {
            font-size: 1.8rem;
            font-weight: bold;
            display: flex;
            align-items: center;
        }
        
        .logo i {
            margin-right: 10px;
            color: var(--primary);
        }
        
        nav ul {
            display: flex;
            list-style: none;
        }
        
        nav li {
            margin-left: 1.5rem;
        }
        
        nav a {
            color: white;
            text-decoration: none;
            font-weight: 500;
            transition: color 0.3s;
            padding: 0.5rem;
            border-radius: 4px;
        }
        
        nav a:hover {
            color: var(--primary);
            background: rgba(255,255,255,0.1);
        }
        
        .hamburger {
            display: none;
            cursor: pointer;
            background: none;
            border: none;
            color: white;
            font-size: 1.5rem;
        }
        
        main {
            flex: 1;
            padding: 2rem 0;
        }
        
        .hero {
            text-align: center;
            padding: 3rem 0;
            color: white;
            margin-bottom: 2rem;
        }
        
        .hero h1 {
            font-size: 2.5rem;
            margin-bottom: 1rem;
            text-shadow: 0 2px 4px rgba(0,0,0,0.3);
        }
        
        .hero p {
            font-size: 1.2rem;
            max-width: 700px;
            margin: 0 auto 2rem;
        }
        
        .calculator-card {
            background: rgba(255, 255, 255, 0.95);
            border-radius: 10px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.15);
            padding: 2rem;
            max-width: 800px;
            margin: 0 auto;
        }
        
        .calculator-card h2 {
            text-align: center;
            margin-bottom: 1.5rem;
            color: var(--secondary);
        }
        
        .form-group {
            margin-bottom: 1.5rem;
        }
        
        label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 500;
            color: var(--dark);
        }
        
        input, select {
            width: 100%;
            padding: 12px 15px;
            border: 1px solid #ddd;
            border-radius: 5px;
            font-size: 1rem;
            transition: border-color 0.3s;
        }
        
        input:focus, select:focus {
            border-color: var(--primary);
            outline: none;
            box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.2);
        }
        
        .btn {
            display: inline-block;
            background: var(--primary);
            color: white;
            padding: 12px 25px;
            border: none;
            border-radius: 5px;
            cursor: pointer;
            font-size: 1rem;
            font-weight: 600;
            text-align: center;
            transition: all 0.3s;
            width: 100%;
        }
        
        .btn:hover {
            background: #2980b9;
            transform: translateY(-2px);
            box-shadow: 0 4px 8px rgba(0,0,0,0.1);
        }
        
        .result-container {
            margin-top: 2rem;
            padding: 1.5rem;
            border-radius: 8px;
            background: #f8f9fa;
            display: none;
        }
        
        .probability-meter {
            height: 30px;
            background: #e0e0e0;
            border-radius: 15px;
            margin: 1rem 0;
            overflow: hidden;
        }
        
        .probability-fill {
            height: 100%;
            background: linear-gradient(90deg, var(--success), var(--warning), var(--danger));
            border-radius: 15px;
            width: 0%;
            transition: width 1s ease-in-out;
        }
        
        .probability-text {
            text-align: center;
            font-size: 1.2rem;
            font-weight: bold;
            margin: 1rem 0;
        }
        
        .forecast-details {
            margin-top: 1.5rem;
        }
        
        .forecast-item {
            display: flex;
            justify-content: space-between;
            padding: 10px 0;
            border-bottom: 1px solid #eee;
        }
        
        .content-section {
            background: rgba(255, 255, 255, 0.95);
            border-radius: 10px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.15);
            padding: 2rem;
            max-width: 800px;
            margin: 2rem auto;
        }
        
        .content-section h2 {
            color: var(--secondary);
            margin-bottom: 1.5rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid var(--primary);
        }
        
        footer {
            background: rgba(44, 62, 80, 0.95);
            color: white;
            padding: 2rem 0;
            margin-top: auto;
        }
        
        .footer-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 2rem;
        }
        
        .footer-section h3 {
            margin-bottom: 1rem;
            color: var(--primary);
        }
        
        .footer-section ul {
            list-style: none;
        }
        
        .footer-section li {
            margin-bottom: 0.5rem;
        }
        
        .footer-section a {
            color: #ecf0f1;
            text-decoration: none;
            transition: color 0.3s;
        }
        
        .footer-section a:hover {
            color: var(--primary);
        }
        
        .copyright {
            text-align: center;
            padding-top: 2rem;
            margin-top: 2rem;
            border-top: 1px solid rgba(255,255,255,0.1);
        }
        
        /* Responsive Design */
        @media (max-width: 768px) {
            .header-container {
                flex-direction: column;
                text-align: center;
            }
            
            nav ul {
                margin-top: 1rem;
                flex-direction: column;
            }
            
            nav li {
                margin: 0.5rem 0;
            }
            
            .hamburger {
                display: block;
                position: absolute;
                top: 1rem;
                right: 1rem;
            }
            
            .hero h1 {
                font-size: 2rem;
            }
            
            .footer-container {
                grid-template-columns: 1fr;
            }
        }
        
        /* Animation */
        @keyframes fadeIn {
            from { opacity: 0; }
            to { opacity: 1; }
        }
        
        .fade-in {
            animation: fadeIn 0.5s ease-in;
        }
        
        .snowflake {
            color: #fff;
            font-size: 1.5rem;
            position: absolute;
            top: -20px;
            animation: fall linear forwards;
        }
        
        @keyframes fall {
            to {
                transform: translateY(105vh);
            }
        }

        /* Add this in your CSS file or in a <style> tag */
.hamburger {
  font-size: 24px;
  background: none;
  border: none;
  cursor: pointer;
  display: none;
}

/* Desktop styles */
.nav-menu {
  display: block;
}

/* Mobile styles */
@media (max-width: 768px) {
  .hamburger {
    display: block;
  }

  .nav-menu {
    display: none;
    width: 100%;
    background-color: #333;
    padding: 10px 0;
  }

  .nav-menu.show {
    display: block;
  }

  .nav-menu ul {
    display: flex;
    flex-direction: column;
    align-items: center;
  }

  .nav-menu li {
    margin: 10px 0;
  }

  .nav-menu a {
    color: white;
    text-decoration: none;
    font-size: 16px;
  }
}