body, div, input, li, p, span, td, textarea, select {
    font-family: arial, helvetica, sans-serif;
    font-size: 16px;
}

.calculator-container {
    background-color: white;
    width: 90%;
    max-width: 500px;
    margin: 20px auto;
    padding: 25px;
    border-radius: 20px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

.calculator-container h1 {
    color: #053b7d;
    font-size: 1.4rem;
    margin-bottom: 5px;
    text-align: center;
}

.calculator-container h1 i {
    margin-right: 10px;
    color: #dc3545;
}

.calculator-container .subtitle {
    color: #666;
    font-size: 0.9rem;
    text-align: center;
    margin-bottom: 20px;
}

.input-container {
    display: flex;
    flex-direction: column;
    margin-bottom: 15px;
}

.input-container label {
    font-weight: bold;
    margin-bottom: 5px;
    color: #333;
}

.input-container input,
.input-container select {
    width: 100%;
    padding: 12px;
    font-size: 1rem;
    border: 1px solid #cfd1d8;
    border-radius: 5px;
    outline: none;
    box-sizing: border-box;
}

.input-container input:focus,
.input-container select:focus {
    border-color: #053b7d;
    box-shadow: 0 0 5px rgba(5, 59, 125, 0.3);
}

#button-container {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-top: 20px;
}

#button-container button {
    padding: 12px 25px;
    border: 0;
    color: #fff;
    font-size: 16px;
    background: #084288;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s ease;
    display: flex;
    align-items: center;
    gap: 8px;
}

#button-container button:hover {
    background-color: #0a5a9c;
}

#result {
    margin-top: 25px;
    padding: 20px;
    background-color: #f8f9fa;
    border-radius: 10px;
}

#result h3 {
    color: #053b7d;
    margin-top: 0;
    margin-bottom: 15px;
    text-align: center;
}

.mhr-average {
    background: linear-gradient(135deg, #dc3545 0%, #c82333 100%);
    color: white;
    padding: 20px;
    border-radius: 15px;
    text-align: center;
    margin-bottom: 20px;
}

.mhr-average .value {
    font-size: 3rem;
    font-weight: bold;
    font-family: 'Orbitron', monospace;
}

.mhr-average .label {
    font-size: 1rem;
    opacity: 0.9;
}

.formula-results {
    background: white;
    padding: 15px;
    border-radius: 10px;
    margin-bottom: 20px;
}

.formula-results h4 {
    color: #053b7d;
    margin-top: 0;
    margin-bottom: 10px;
}

.formula-item {
    display: flex;
    justify-content: space-between;
    padding: 8px 0;
    border-bottom: 1px solid #eee;
}

.formula-item:last-child {
    border-bottom: none;
}

.formula-item .name {
    color: #333;
}

.formula-item .value {
    font-weight: bold;
    color: #dc3545;
}

.zones-section {
    background: white;
    padding: 15px;
    border-radius: 10px;
}

.zones-section h4 {
    color: #053b7d;
    margin-top: 0;
    margin-bottom: 10px;
}

.zone-bar {
    margin: 10px 0;
    border-radius: 5px;
    overflow: hidden;
}

.zone-bar .bar {
    height: 30px;
    display: flex;
    align-items: center;
    padding: 0 10px;
    color: white;
    font-weight: bold;
    font-size: 0.9rem;
}

.zone-bar .bar span {
    margin-left: auto;
}

.zone1 { background: linear-gradient(90deg, #4CAF50, #8BC34A); }
.zone2 { background: linear-gradient(90deg, #8BC34A, #CDDC39); }
.zone3 { background: linear-gradient(90deg, #CDDC39, #FFC107); color: #333; }
.zone4 { background: linear-gradient(90deg, #FFC107, #FF9800); color: #333; }
.zone5 { background: linear-gradient(90deg, #FF9800, #f44336); }

.zone-table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
}

.zone-table th, .zone-table td {
    padding: 10px;
    text-align: left;
    border-bottom: 1px solid #ddd;
}

.zone-table th {
    background-color: #053b7d;
    color: white;
}

.zone-table tr:hover {
    background-color: #f5f5f5;
}

@media (max-width: 600px) {
    .calculator-container {
        width: 95%;
        padding: 15px;
    }

    #button-container {
        flex-direction: column;
    }

    #button-container button {
        width: 100%;
        justify-content: center;
    }

    .mhr-average .value {
        font-size: 2.5rem;
    }

    .zone-bar .bar {
        font-size: 0.8rem;
    }
}