/* Reset and Base Styles */
* {
    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, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* Header Styles */
.header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    padding: 20px 0;
    margin-bottom: 30px;
    border-radius: 15px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

.header h1 {
    text-align: center;
    color: #2c3e50;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 10px;
}

.header p {
    text-align: center;
    color: #7f8c8d;
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto;
}

/* Navigation Dropdown */
.nav-dropdown {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    padding: 20px;
    margin-bottom: 30px;
    border-radius: 15px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    text-align: center;
}

.nav-dropdown label {
    display: block;
    margin-bottom: 10px;
    font-weight: 600;
    color: #2c3e50;
    font-size: 1.1rem;
}

.nav-dropdown select {
    padding: 12px 20px;
    border: 2px solid #e1e8ed;
    border-radius: 10px;
    font-size: 1rem;
    background: white;
    color: #2c3e50;
    cursor: pointer;
    transition: all 0.3s ease;
    min-width: 300px;
}

.nav-dropdown select:hover {
    border-color: #667eea;
}

.nav-dropdown select:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

/* Calculator Styles */
.calculator-section {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    padding: 40px;
    margin-bottom: 30px;
    border-radius: 15px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

.calculator-title {
    text-align: center;
    color: #2c3e50;
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: 30px;
}

.calculator-form {
    max-width: 600px;
    margin: 0 auto;
}

.form-group {
    margin-bottom: 25px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: #2c3e50;
    font-size: 1rem;
}

.form-group input {
    width: 100%;
    padding: 15px;
    border: 2px solid #e1e8ed;
    border-radius: 10px;
    font-size: 1rem;
    transition: all 0.3s ease;
    background: white;
}

.form-group input:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.calculate-btn {
    width: 100%;
    padding: 15px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-bottom: 20px;
}

.calculate-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.3);
}

.result-section {
    background: #f8f9fa;
    padding: 20px;
    border-radius: 10px;
    margin-top: 20px;
    text-align: center;
    display: none;
}

.result-section.show {
    display: block;
}

.result-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: #2c3e50;
    margin-bottom: 10px;
}

.result-description {
    color: #7f8c8d;
    font-size: 1rem;
}

/* CTA Button */
.cta-section {
    text-align: center;
    margin-top: 30px;
}

.cta-btn {
    display: inline-block;
    padding: 15px 30px;
    background: linear-gradient(135deg, #e74c3c 0%, #c0392b 100%);
    color: white;
    text-decoration: none;
    border-radius: 10px;
    font-size: 1.1rem;
    font-weight: 600;
    transition: all 0.3s ease;
}

.cta-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(231, 76, 60, 0.3);
    text-decoration: none;
    color: white;
}

/* Content Section */
.content-section {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    padding: 40px;
    margin-bottom: 30px;
    border-radius: 15px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

.content-section h2 {
    color: #2c3e50;
    font-size: 1.8rem;
    font-weight: 600;
    margin-bottom: 20px;
}

.content-section p {
    color: #555;
    font-size: 1rem;
    margin-bottom: 15px;
    text-align: justify;
}

/* Footer */
.footer {
    background: rgba(44, 62, 80, 0.95);
    backdrop-filter: blur(10px);
    color: white;
    padding: 30px 0;
    margin-top: 50px;
    border-radius: 15px;
    text-align: center;
}

.footer-links {
    margin-bottom: 20px;
}

.footer-links a {
    color: #ecf0f1;
    text-decoration: none;
    margin: 0 15px;
    font-weight: 500;
    transition: color 0.3s ease;
}

.footer-links a:hover {
    color: #667eea;
}

.footer p {
    color: #bdc3c7;
    font-size: 0.9rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 15px;
    }
    
    .header h1 {
        font-size: 2rem;
    }
    
    .calculator-section {
        padding: 25px;
    }
    
    .calculator-title {
        font-size: 1.5rem;
    }
    
    .nav-dropdown select {
        min-width: 100%;
    }
    
    .content-section {
        padding: 25px;
    }
}

@media (max-width: 480px) {
    .header h1 {
        font-size: 1.7rem;
    }
    
    .calculator-title {
        font-size: 1.3rem;
    }
    
    .calculator-section {
        padding: 20px;
    }
    
    .content-section {
        padding: 20px;
    }
}