.epf-calculator-container * {
    box-sizing: border-box;
}

.epf-calculator-container {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f8fafc;
    color: #1e293b;
    padding: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    max-width: 600px;
    width: 100%;
    margin: 0 auto;
}

.epf-calculator-container h1 {
    text-align: center;
    color: white;
    background-color: #343a40;
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 20px;
}

.epf-calculator-container .card {
    background: white;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    padding: 30px;
    width: 100%;
}

.epf-calculator-container .input-section {
    margin-bottom: 30px;
}

.epf-calculator-container .input-group {
    margin-bottom: 25px;
}

.epf-calculator-container label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: #374151;
}

.epf-calculator-container .controls {
    display: flex;
    align-items: center;
    margin-bottom: 8px;
}

.epf-calculator-container .unit {
    margin-right: 8px;
    font-weight: bold;
    color: #6b7280;
}

.epf-calculator-container .num-input {
    border: 1px solid #d1d5db;
    border-radius: 6px;
    padding: 8px 12px;
    font-size: 16px;
    width: 120px;
    margin-right: 8px;
}

.epf-calculator-container .num-input:focus {
    outline: none;
    border-color: #3b82f6;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.epf-calculator-container .slider {
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: #e5e7eb;
    outline: none;
    -webkit-appearance: none;
}

.epf-calculator-container .slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: #3b82f6;
    cursor: pointer;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.epf-calculator-container .slider::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: #3b82f6;
    cursor: pointer;
    border: none;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.epf-calculator-container .output {
    text-align: center;
    background: #f1f5f9;
    padding: 20px;
    border-radius: 8px;
}

.epf-calculator-container .output h3 {
    margin-bottom: 15px;
    color: #1e293b;
    display: flex;
    align-items: baseline;
    justify-content: center;
    flex-wrap: wrap;
}

.epf-calculator-container #corpus {
    color: #16a34a;
    font-size: 2em;
    font-weight: bold;
    margin-left: 15px;
}

.epf-calculator-container .output p {
    margin: 10px 0;
    font-size: 1.1em;
}

.epf-calculator-container .chart {
    margin-top: 20px;
    display: flex;
    justify-content: center;
}

/* Responsive */
@media (max-width: 768px) {
    .epf-calculator-container {
        padding: 10px;
    }

    .epf-calculator-container .card {
        padding: 20px;
    }

    .epf-calculator-container .controls {
        flex-direction: column;
        align-items: flex-start;
    }

    .epf-calculator-container .num-input {
        width: 100%;
        margin-right: 0;
        margin-bottom: 8px;
    }

    .epf-calculator-container .unit {
        margin-right: 0;
        margin-bottom: 8px;
    }

    .epf-calculator-container #corpus {
        font-size: 1.5em;
        margin-left: 10px;
    }
}

@media (max-width: 480px) {
    .epf-calculator-container {
        padding: 10px;
    }

    .epf-calculator-container .card {
        padding: 15px;
    }
}