:root {
    --primary: #1a3a5f;
    --secondary: #d4af37;
    --light: #f8f9fa;
    --dark: #212529;
    --gray: #6c757d;
    --success: #28a745;
    --danger: #dc3545;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: #f5f7fa;
    color: var(--dark);
    line-height: 1.6;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

/* Header Styles */
header {
    background-color: var(--primary);
    color: white;
    padding: 1rem 0;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.logo {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--secondary);
    display: flex;
    align-items: center;
    cursor: pointer;
}

.logo i {
    margin-right: 10px;
}

nav ul {
    display: flex;
    list-style: none;
}

nav ul li {
    margin-left: 1.5rem;
}

nav ul li a {
    color: white;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
    padding: 5px 0;
    position: relative;
}

nav ul li a:hover {
    color: var(--secondary);
}

nav ul li a.active {
    color: var(--secondary);
}

nav ul li a.active::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--secondary);
}

.mobile-menu {
    display: none;
    font-size: 1.5rem;
    cursor: pointer;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--primary) 0%, #2c5282 100%);
    color: white;
    padding: 4rem 0;
    text-align: center;
}

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

.hero p {
    font-size: 1.2rem;
    max-width: 700px;
    margin: 0 auto 2rem;
}

.btn {
    display: inline-block;
    background-color: var(--secondary);
    color: var(--primary);
    padding: 0.8rem 1.5rem;
    border-radius: 4px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s;
    border: none;
    cursor: pointer;
}

.btn:hover {
    background-color: #e6c12e;
    transform: translateY(-2px);
}

.btn-outline {
    background-color: transparent;
    border: 2px solid var(--secondary);
    color: var(--secondary);
}

.btn-outline:hover {
    background-color: var(--secondary);
    color: var(--primary);
}

/* Calculators Grid */
.calculators {
    padding: 4rem 0;
}

.section-title {
    text-align: center;
    margin-bottom: 3rem;
    color: var(--primary);
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 80px;
    height: 3px;
    background-color: var(--secondary);
    margin: 10px auto 0;
}

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

.calculator-card {
    background: white;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s;
}

.calculator-card:hover {
    transform: translateY(-5px);
}

.calculator-icon {
    background-color: var(--primary);
    color: white;
    padding: 1.5rem;
    text-align: center;
    font-size: 2rem;
}

.calculator-content {
    padding: 1.5rem;
}

.calculator-content h3 {
    margin-bottom: 1rem;
    color: var(--primary);
}

.calculator-content p {
    margin-bottom: 1.5rem;
    color: var(--gray);
}

/* Calculator Form Styles */
.calculator-form {
    background: white;
    border-radius: 8px;
    padding: 2rem;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    margin-bottom: 2rem;
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--primary);
}

.form-control {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

.form-control:focus {
    border-color: var(--primary);
    outline: none;
    box-shadow: 0 0 0 2px rgba(26, 58, 95, 0.2);
}

.form-row {
    display: flex;
    gap: 1rem;
}

.form-row .form-group {
    flex: 1;
}

.result-box {
    background-color: #f8f9fa;
    border-left: 4px solid var(--secondary);
    padding: 1.5rem;
    margin-top: 1.5rem;
    border-radius: 4px;
}

.result-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
    margin: 0.5rem 0;
}

/* Features Section */
.features {
    background-color: white;
    padding: 4rem 0;
}

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

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

.feature i {
    font-size: 2.5rem;
    color: var(--secondary);
    margin-bottom: 1rem;
}

.feature h3 {
    margin-bottom: 1rem;
    color: var(--primary);
}

/* Content Sections */
.content-section {
    padding: 2rem 0;
}

.content-section h2 {
    color: var(--primary);
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid #eee;
}

.content-section h3 {
    color: var(--primary);
    margin: 1.5rem 0 1rem;
}

.content-section p {
    margin-bottom: 1rem;
}

.content-section ul {
    margin-left: 1.5rem;
    margin-bottom: 1.5rem;
}

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

.faq-item {
    margin-bottom: 1.5rem;
    border-bottom: 1px solid #eee;
    padding-bottom: 1.5rem;
}

.faq-question {
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 0.5rem;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.faq-answer {
    color: var(--gray);
}

/* Footer */
footer {
    background-color: var(--primary);
    color: white;
    padding: 3rem 0 1.5rem;
    margin-top: 3rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-column h3 {
    color: var(--secondary);
    margin-bottom: 1.5rem;
    font-size: 1.2rem;
}

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

.footer-column ul li {
    margin-bottom: 0.8rem;
}

.footer-column ul li a {
    color: #cbd5e0;
    text-decoration: none;
    transition: color 0.3s;
}

.footer-column ul li a:hover {
    color: var(--secondary);
}

.copyright {
    text-align: center;
    padding-top: 1.5rem;
    border-top: 1px solid #2d3748;
    color: #a0aec0;
    font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
    }

    nav ul {
        margin-top: 1rem;
        flex-wrap: wrap;
        justify-content: center;
    }

    nav ul li {
        margin: 0.5rem;
    }

    .mobile-menu {
        display: block;
        position: absolute;
        top: 1rem;
        right: 1rem;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .hero p {
        font-size: 1rem;
    }

    .form-row {
        flex-direction: column;
        gap: 0;
    }
}

/* Tabs for calculator pages */
.tabs {
    display: flex;
    margin-bottom: 2rem;
    border-bottom: 1px solid #ddd;
}

.tab {
    padding: 1rem 1.5rem;
    cursor: pointer;
    font-weight: 500;
    color: var(--gray);
    border-bottom: 3px solid transparent;
    transition: all 0.3s;
}

.tab.active {
    color: var(--primary);
    border-bottom-color: var(--secondary);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* Page container */
.page {
    display: none;
    padding: 2rem 0;
}

.page.active {
    display: block;
}

/* Alert box */
.alert {
    padding: 1rem;
    border-radius: 4px;
    margin-bottom: 1rem;
}

.alert-info {
    background-color: #d1ecf1;
    border-left: 4px solid #17a2b8;
    color: #0c5460;
}

.alert-warning {
    background-color: #fff3cd;
    border-left: 4px solid #ffc107;
    color: #856404;
}