* {
    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;
}

header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    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;
}

.controls {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    margin-bottom: 2rem;
    display: flex;
    gap: 2rem;
    align-items: center;
    flex-wrap: wrap;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.input-group label {
    font-weight: 600;
    color: #555;
}

.input-group input,
.input-group select {
    padding: 0.75rem;
    border: 2px solid #e1e5e9;
    border-radius: 4px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

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

button {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 0.75rem 2rem;
    border-radius: 4px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s;
}

button:hover {
    transform: translateY(-2px);
}

.results {
    display: grid;
    gap: 2rem;
}

.comparison-table {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    overflow-x: auto;
}

.comparison-table h2 {
    margin-bottom: 1rem;
    color: #333;
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

th, td {
    padding: 0.75rem;
    text-align: left;
    border-bottom: 1px solid #e1e5e9;
}

th {
    background-color: #f8f9fa;
    font-weight: 600;
    color: #555;
}

tr:hover {
    background-color: #f8f9fa;
}

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

.chart-container canvas {
    height: 350px;
}

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

.methodology h2 {
    margin-bottom: 1rem;
    color: #333;
}

.methodology p {
    margin-bottom: 1rem;
    color: #666;
}

.positive {
    color: #28a745;
}

.negative {
    color: #dc3545;
}

@media (max-width: 768px) {
    .controls {
        flex-direction: column;
        align-items: stretch;
    }

    header h1 {
        font-size: 2rem;
    }

    table {
        font-size: 0.7rem;
    }

    th, td {
        padding: 0.4rem;
    }
}

button:hover {
    transform: translateY(-2px);
}

.coffee-button {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: #FFDD00;
    color: #000;
    text-decoration: none;
    padding: 0.75rem 1.5rem;
    border-radius: 25px;
    font-weight: 600;
    font-size: 0.95rem;
    margin-top: 1rem;
    transition: all 0.3s ease;
    box-shadow: 0 2px 8px rgba(0,0,0,0.15);
}

.coffee-button:hover {
    background: #FFE135;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
}

.coffee-icon {
    font-size: 1.2rem;
}