* {
    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: #f8f9fa;
}

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

/* Header */
.header {
    background: #2c3e50;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav {
    padding: 1rem 0;
}

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

.nav-brand .brand-link {
    color: #fff;
    font-size: 1.5rem;
    font-weight: bold;
    text-decoration: none;
}

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

.nav-link {
    color: #bdc3c7;
    text-decoration: none;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 5px;
    transition: all 0.3s ease;
}

.nav-link:hover,
.nav-link.active {
    color: #3498db;
    background: rgba(52, 152, 219, 0.1);
}

/* Main Content */
.main {
    padding: 2rem 0;
}

/* Ad Banner */
.ad-banner {
    margin: 2rem 0;
    text-align: center;
}

/* Hero Section */
.hero {
    text-align: center;
    padding: 3rem 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-radius: 10px;
    margin-bottom: 2rem;
}

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

.hero-subtitle {
    font-size: 1.2rem;
    opacity: 0.9;
}

/* Prices Section */
.prices-section {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    margin-bottom: 2rem;
}

.section-title {
    text-align: center;
    margin-bottom: 1.5rem;
    color: #2c3e50;
    font-size: 1.8rem;
}

.prices-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

.price-card {
    background: #f8f9fa;
    padding: 1.5rem;
    border-radius: 8px;
    text-align: center;
    border-left: 4px solid #3498db;
}

.coin-name {
    font-weight: 600;
    color: #2c3e50;
    margin-bottom: 0.5rem;
}

.coin-price {
    font-size: 1.3rem;
    font-weight: bold;
    color: #2c3e50;
    margin-bottom: 0.5rem;
}

.coin-change {
    font-weight: 600;
}

.positive {
    color: #27ae60;
}

.negative {
    color: #e74c3c;
}

/* Calculator Section */
.calculator-section {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    margin-bottom: 2rem;
}

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

.form-title,
.results-title {
    color: #2c3e50;
    margin-bottom: 1.5rem;
    text-align: center;
    font-size: 1.4rem;
}

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

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: #2c3e50;
}

.form-select,
.form-input {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid #e9ecef;
    border-radius: 5px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.form-select:focus,
.form-input:focus {
    outline: none;
    border-color: #3498db;
}

.calculate-btn {
    background: #3498db;
    color: white;
    padding: 1rem 2rem;
    border: none;
    border-radius: 5px;
    font-size: 1.1rem;
    cursor: pointer;
    transition: background 0.3s ease;
    width: 100%;
}

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

/* Results Section */
.results-grid {
    display: grid;
    gap: 1rem;
}

.result-item {
    background: #f8f9fa;
    padding: 1.5rem;
    border-radius: 8px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border: 2px solid transparent;
    transition: all 0.3s ease;
}

.result-item:hover {
    border-color: #3498db;
}

.result-item.highlight {
    background: #3498db;
    color: white;
}

.result-label {
    font-weight: 600;
}

.result-item.highlight .result-label {
    color: rgba(255,255,255,0.9);
}

.result-value {
    font-weight: bold;
    font-size: 1.1rem;
}

.result-item.highlight .result-value {
    font-size: 1.3rem;
}

/* Miners Table */
.miners-section {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.profitability-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1rem;
}

.profitability-table th {
    background: #34495e;
    color: white;
    font-weight: 600;
    padding: 1rem;
    text-align: left;
}

.profitability-table td {
    padding: 1rem;
    border-bottom: 1px solid #ecf0f1;
    color: #2c3e50;
}

.profitability-table tr:hover {
    background: #f8f9fa;
}

.profitability-table .profit {
    color: #27ae60;
    font-weight: bold;
    font-size: 1.1rem;
}

/* Footer */
.footer {
    background: #2c3e50;
    color: white;
    text-align: center;
    padding: 2rem 0;
    margin-top: 3rem;
}

/* Responsive */
@media (max-width: 768px) {
    .calculator-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .nav-menu {
        gap: 1rem;
    }
    
    .nav-link {
        padding: 0.5rem;
        font-size: 0.9rem;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .prices-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .profitability-table {
        font-size: 0.9rem;
    }
    
    .profitability-table th,
    .profitability-table td {
        padding: 0.75rem 0.5rem;
    }
}