:root {
    --primary-color: #2ecc71;
    --secondary-color: #3498db;
    --background-color: #1a1a1a;
    --card-background: #2d2d2d;
    --text-color: #ffffff;
    --danger-color: #e74c3c;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
}

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

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
}

.controls {
    display: flex;
    gap: 10px;
}

.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn.primary {
    background-color: var(--primary-color);
    color: white;
}

.btn.secondary {
    background-color: var(--secondary-color);
    color: white;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
}

.alert-box {
    background-color: var(--card-background);
    padding: 20px;
    border-radius: 10px;
    margin-bottom: 30px;
    text-align: center;
    font-size: 1.2rem;
    font-weight: 600;
    border-left: 5px solid var(--primary-color);
}

.alert-box.success {
    border-left-color: var(--primary-color);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background-color: var(--card-background);
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.stat-card h3 {
    font-size: 1.1rem;
    color: #888;
    margin-bottom: 10px;
}

.stat-card p {
    font-size: 1.4rem;
    font-weight: 600;
}

.hash {
    font-family: monospace;
    font-size: 1rem !important;
    word-break: break-all;
}

.charts {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
}

#hashrateChart,
#totalHashesChart {
    background-color: var(--card-background);
    border-radius: 10px;
    padding: 20px;
    height: 400px;
}

@media (max-width: 768px) {
    header {
        flex-direction: column;
        gap: 20px;
        text-align: center;
    }

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