/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Arial', sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #ffffff;
}

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

/* Header and Navigation */
.navbar {
    background: #003366;
    color: white;
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo h1 {
    color: white;
    text-decoration: none;
    font-size: 1.8rem;
    font-weight: bold;
    text-align: center;
}

.nav-logo {
    text-decoration: none;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-link {
    color: white;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
    padding: 0.5rem 1rem;
    border-radius: 5px;
}

.nav-link:hover {
    background: rgba(255,255,255,0.1);
    color: #cce6ff;
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.bar {
    width: 25px;
    height: 3px;
    background: white;
    margin: 3px 0;
    transition: 0.3s;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #003366 0%, #004d99 100%);
    color: white;
    padding: 4rem 0;
    text-align: center;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
    font-weight: bold;
}

.hero-subtitle {
    font-size: 1.3rem;
    margin-bottom: 1.5rem;
    opacity: 0.9;
}

.hero-description {
    font-size: 1.1rem;
    max-width: 800px;
    margin: 0 auto;
    opacity: 0.8;
    line-height: 1.8;
}

/* Features Section */
.features {
    padding: 4rem 0;
    background: #f8f9fa;
}

.features h2 {
    text-align: center;
    color: #003366;
    font-size: 2.5rem;
    margin-bottom: 3rem;
}

.calculator-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.calculator-card {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.calculator-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.15);
}

.calculator-card h3 {
    color: #003366;
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.calculator-card p {
    margin-bottom: 1.5rem;
    color: #666;
    line-height: 1.7;
}

.calculator-card ul {
    list-style: none;
    margin-bottom: 1.5rem;
}

.calculator-card li {
    padding: 0.3rem 0;
    color: #555;
    position: relative;
    padding-left: 1.5rem;
}

.calculator-card li::before {
    content: "✓";
    color: #003366;
    font-weight: bold;
    position: absolute;
    left: 0;
}

.cta-button {
    display: inline-block;
    background: #003366;
    color: white;
    padding: 0.75rem 1.5rem;
    text-decoration: none;
    border-radius: 5px;
    font-weight: bold;
    transition: background 0.3s ease;
    text-align: center;
}

.cta-button:hover {
    background: #004d99;
}

/* Why Choose Section */
.why-choose {
    padding: 4rem 0;
}

.why-choose h2 {
    text-align: center;
    color: #003366;
    font-size: 2.5rem;
    margin-bottom: 3rem;
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.benefit {
    text-align: center;
    padding: 1.5rem;
}

.benefit h3 {
    color: #003366;
    font-size: 1.3rem;
    margin-bottom: 1rem;
}

.benefit p {
    color: #666;
    line-height: 1.7;
}

/* Calculator Pages Styles */
.page-header {
    background: linear-gradient(135deg, #003366 0%, #004d99 100%);
    color: white;
    padding: 3rem 0;
    text-align: center;
}

.page-header h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.page-header p {
    font-size: 1.2rem;
    opacity: 0.9;
    max-width: 600px;
    margin: 0 auto;
}

.calculator-section {
    padding: 3rem 0;
}

.calculator-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    margin-bottom: 3rem;
}

.calculator-form {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.calculator-results {
    background: #f8f9fa;
    padding: 2rem;
    border-radius: 10px;
    border-left: 4px solid #003366;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: #003366;
    font-weight: bold;
}

.form-group input, .form-group select {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid #ddd;
    border-radius: 5px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.form-group input:focus, .form-group select:focus {
    outline: none;
    border-color: #003366;
}

.calculate-btn {
    background: #003366;
    color: white;
    padding: 1rem 2rem;
    border: none;
    border-radius: 5px;
    font-size: 1.1rem;
    font-weight: bold;
    cursor: pointer;
    width: 100%;
    transition: background 0.3s ease;
}

.calculate-btn:hover {
    background: #004d99;
}

.result-item {
    display: flex;
    justify-content: space-between;
    padding: 0.75rem 0;
    border-bottom: 1px solid #ddd;
}

.result-item:last-child {
    border-bottom: none;
}

.result-label {
    font-weight: bold;
    color: #003366;
}

.result-value {
    font-size: 1.1rem;
    color: #333;
}

.calculator-info {
    background: white;
    padding: 2rem;
    margin-top: 2rem;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.calculator-info h3 {
    color: #003366;
    margin-bottom: 1rem;
}

.calculator-info p {
    line-height: 1.7;
    color: #666;
    margin-bottom: 1rem;
}

/* Footer */
footer {
    background: #003366;
    color: white;
    padding: 3rem 0 1rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h3, .footer-section h4 {
    margin-bottom: 1rem;
    color: white;
}

.footer-section ul {
    list-style: none;
}

.footer-section li {
    margin-bottom: 0.5rem;
}

.footer-section a {
    color: #cce6ff;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section a:hover {
    color: white;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid #004d99;
    opacity: 0.8;
}

/* Responsive Design */
@media screen and (max-width: 768px) {
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: #003366;
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: 0 10px 27px rgba(0,0,0,0.05);
        padding: 2rem 0;
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-item {
        margin: 1rem 0;
    }

    .hamburger {
        display: flex;
    }

    .hamburger.active .bar:nth-child(2) {
        opacity: 0;
    }

    .hamburger.active .bar:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }

    .hamburger.active .bar:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
    }

    .hero h1 {
        font-size: 2.2rem;
    }

    .hero-subtitle {
        font-size: 1.1rem;
    }

    .calculator-grid {
        grid-template-columns: 1fr;
    }

    .calculator-container {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .benefits-grid {
        grid-template-columns: 1fr;
    }

    .nav-logo h1 {
        font-size: 1.5rem;
    }
}

@media screen and (max-width: 480px) {
    .container {
        padding: 0 15px;
    }

    .hero {
        padding: 2rem 0;
    }

    .hero h1 {
        font-size: 1.8rem;
    }

    .calculator-card, .calculator-form, .calculator-results {
        padding: 1.5rem;
    }

    .page-header h1 {
        font-size: 2rem;
    }
}

/* Additional utility classes */
.text-center {
    text-align: center;
}

.mt-2 {
    margin-top: 2rem;
}

.mb-2 {
    margin-bottom: 2rem;
}

.primary-color {
    color: #003366;
}

.highlight {
    background: #cce6ff;
    padding: 0.2rem 0.5rem;
    border-radius: 3px;
}