:root {
    --primary: #2A6F39;
    --secondary: #83C187;
    --background: #f9fbf8;
    --text: #1a2e1f;
}

body {
    font-family: 'Space Grotesk', system-ui;
    margin: 0;
    padding: 2rem;
    background: var(--background);
    line-height: 1.6;
    min-height: 100vh;
    color: var(--text);
}

.calculator-container {
    max-width: 680px;
    margin: 2rem auto;
    padding: 2rem;
    background: white;
    border-radius: 16px;
    box-shadow: 0 8px 32px rgba(42, 111, 57, 0.1);
}

.main-header {
    text-align: center;
    margin-bottom: 3rem;
    padding: 2rem 1rem;
}

.calculator-form {
    display: grid;
    gap: 1.5rem;
}

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

.unit-selector {
    display: flex;
    gap: 1rem;
    align-items: center;
    margin-bottom: 1rem;
}

.unit-option {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

input[type="number"] {
    padding: 0.8rem;
    border: 2px solid #ddd;
    border-radius: 8px;
    font-size: 1.1rem;
    width: 100%;
}

.cta-button {
    background: var(--primary);
    color: white;
    padding: 1rem 2rem;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: transform 0.2s ease;
    font-size: 1.1rem;
}

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

.result-card {
    padding: 1.5rem;
    background: var(--background);
    border-left: 4px solid var(--secondary);
    margin-top: 2rem;
    animation: fadeIn 0.3s ease;
}

.spacing-guide {
    max-width: 680px;
    margin: 2rem auto;
    padding: 2rem;
    background: white;
    border-radius: 16px;
    box-shadow: 0 8px 32px rgba(42, 111, 57, 0.1);
    font-size: 0.95em;
}

.spacing-guide h2 {
    color: var(--primary);
    margin-top: 0;
}

.unit-result {
    display: flex;
    gap: 2rem;
    margin: 1rem 0;
}

.result-metric {
    font-size: 1.4em;
    font-weight: bold;
    color: var(--primary);
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 768px) {
    body {
        padding: 1rem;
    }
    
    .calculator-container {
        margin: 1rem auto;
        padding: 1.5rem;
    }

    .spacing-guide {
        padding: 1.5rem;
        margin: 1rem auto;
    }
}