* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: #333;
    background-color: #f8fafc;
}

h1 {
    margin-block: 0.67em;
    font-size: 2em;
}

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

header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 1rem 0;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.navbar {
    position: relative;
}

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

.nav-brand h1 {
    font-size: 1.5rem;
    font-weight: 600;
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    color: white;
    text-decoration: none;
    font-weight: 500;
    transition: opacity 0.3s ease;
}

.nav-links a:hover {
    opacity: 0.8;
}

.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 4rem 0;
    text-align: center;
}

.hero-content h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.hero-content p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.calculators-section {
    padding: 4rem 0;
    position: relative;
}

.calculators-section h2 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 3rem;
    color: #2d3748;
}

.calculators-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.calculator-card {
    background: white;
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    border: 2px solid transparent;
    cursor: pointer;
    transition: all 0.3s ease;
}

.calculator-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
}

.calculator-card.active {
    border-color: #667eea;
    background: linear-gradient(135deg, #f7fafc 0%, #edf2f7 100%);
}

.card-header h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: #2d3748;
}

.card-header p {
    color: #718096;
    font-size: 1rem;
}

.calculator-content {
    background: white;
    border-radius: 12px;
    padding: 2rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    margin-bottom: 2rem;
    position: relative;
}

.calculator {
    display: none;
}

.calculator.active {
    display: block;
}

.calculator h3 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: #2d3748;
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: #4a5568;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid #e2e8f0;
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: #667eea;
}

.form-group input[type="checkbox"] {
    width: auto;
    margin-right: 0.5rem;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 0.75rem 2rem;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s ease;
}

.btn-primary:hover {
    transform: translateY(-1px);
}

.result {
    margin-top: 1.5rem;
    padding: 1rem;
    background: #f7fafc;
    border-radius: 8px;
    border-left: 4px solid #667eea;
    font-weight: 500;
}

.result.show {
    animation: fadeInUp 0.5s ease;
}

.about-section {
    background: white;
    padding: 4rem 0;
}

.about-section h2 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 3rem;
    color: #2d3748;
}

.about-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.about-card {
    text-align: center;
    padding: 2rem;
}

.about-card h3 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
    color: #2d3748;
}

.about-card p {
    color: #718096;
    line-height: 1.7;
}

.faq-section {
    padding: 4rem 0;
    background: #f7fafc;
}

.faq-section h2 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 3rem;
    color: #2d3748;
}

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

.faq-item {
    background: white;
    padding: 1.5rem;
    border-radius: 12px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.faq-item h3 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    color: #2d3748;
}

.faq-item p {
    color: #718096;
    line-height: 1.6;
}

.ad-space {
    display: flex;
    justify-content: center;
    margin: 2rem 0;
}

.ad-space-sidebar {
    position: absolute;
    right: -180px;
    top: 50%;
    transform: translateY(-50%);
}

.adsbygoogle {
    border-radius: 8px;
    margin: 1rem 0;
}

footer {
    background: #2d3748;
    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;
}

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

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

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

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

.footer-bottom {
    border-top: 1px solid #4a5568;
    padding-top: 1rem;
    text-align: center;
    color: #cbd5e0;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media (max-width: 1400px) {
    .ad-space-sidebar {
        display: none;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .hero-content h2 {
        font-size: 2rem;
    }
    
    .hero-content p {
        font-size: 1.1rem;
    }
    
    body {
        font-size: 16px;
    }
    
    .calculators-grid {
        grid-template-columns: 1fr;
    }
    
    .about-grid,
    .faq-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .calculator-content {
        padding: 1.5rem;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
}