:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --accent-color: #e74c3c;
    --light-color: #ecf0f1;
    --dark-color: #2c3e50;
    --success-color: #27ae60;
}

* {
    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-color: #f9f9f9;
    padding: 0;
    margin: 0;
}

header {
    background-color: var(--primary-color);
    color: white;
    text-align: center;
    padding: 2rem 1rem;
    margin-bottom: 2rem;
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

header p {
    font-size: 1.1rem;
    opacity: 0.9;
}

main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

.calculator-container {
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    padding: 1.5rem;
    margin-bottom: 2rem;
}

.tabs {
    display: flex;
    flex-wrap: wrap;
    margin-bottom: 1.5rem;
    border-bottom: 1px solid #ddd;
}

.tab-btn {
    padding: 0.75rem 1.5rem;
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    color: #666;
    transition: all 0.3s ease;
    border-bottom: 3px solid transparent;
}

.tab-btn:hover {
    color: var(--secondary-color);
}

.tab-btn.active {
    color: var(--secondary-color);
    border-bottom: 3px solid var(--secondary-color);
}

.tab-content {
    display: none;
    padding: 1rem 0;
}

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

.tab-content h2 {
    margin-bottom: 1.5rem;
    color: var(--primary-color);
    font-size: 1.5rem;
}

.input-group {
    margin-bottom: 1.2rem;
}

.input-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: #555;
}

.input-group input, .input-group select {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 1rem;
}

.calculate-btn {
    background-color: var(--secondary-color);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.3s ease;
    margin-top: 0.5rem;
}

.calculate-btn:hover {
    background-color: #2980b9;
}

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

.results h3 {
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.seo-content {
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    padding: 2rem;
    margin-bottom: 2rem;
}

.seo-content h2 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.8rem;
}

.seo-content h3 {
    color: var(--primary-color);
    margin: 1.5rem 0 1rem;
    font-size: 1.4rem;
}

.seo-content p {
    margin-bottom: 1rem;
    line-height: 1.7;
}

.seo-content ul {
    margin-bottom: 1.5rem;
    padding-left: 2rem;
}

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

footer {
    text-align: center;
    padding: 1.5rem;
    background-color: var(--primary-color);
    color: white;
    margin-top: 2rem;
}

footer p {
    margin-bottom: 0.5rem;
}

/* Responsive design */
@media (max-width: 768px) {
    header h1 {
        font-size: 2rem;
    }
    
    .tabs {
        overflow-x: auto;
        white-space: nowrap;
        display: block;
        padding-bottom: 5px;
    }
    
    .tab-btn {
        display: inline-block;
    }
}

/* Recommended additions to style.css */
.partner-cta {
    box-shadow: 0 4px 15px rgba(229, 46, 113, 0.4);
}
.featured-partner {
    transition: transform 0.3s, box-shadow 0.3s;
}
.featured-partner:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.1);
}