.integral-calculator-container * {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.integral-calculator-container {
    background-color: #f5f7fa;
    color: #333;
    line-height: 1.6;
    padding: 20px;
    max-width: 1200px;
    margin: 0 auto;
}

.integral-calculator-container .container {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.integral-calculator-container .input-section {
    background: white;
    border-radius: 8px;
    padding: 20px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.integral-calculator-container .input-group {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    margin-bottom: 15px;
    align-items: center;
}

.integral-calculator-container .input-field {
    display: flex;
    flex-direction: column;
    flex: 1;
    min-width: 150px;
}

.integral-calculator-container label {
    font-weight: 600;
    margin-bottom: 5px;
    font-size: 14px;
}

.integral-calculator-container input, 
.integral-calculator-container select {
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 16px;
}

.integral-calculator-container input:focus, 
.integral-calculator-container select:focus {
    outline: none;
    border-color: #4a90e2;
    box-shadow: 0 0 0 2px rgba(74, 144, 226, 0.2);
}

.integral-calculator-container .button-group {
    display: flex;
    gap: 10px;
    margin-top: 10px;
}

.integral-calculator-container button {
    padding: 10px 20px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-weight: 600;
    transition: background-color 0.2s;
}

.integral-calculator-container #calcBtn {
    background-color: #4a90e2;
    color: white;
}

.integral-calculator-container #calcBtn:hover {
    background-color: #3a7bc8;
}

.integral-calculator-container #clearBtn {
    background-color: #f1f1f1;
    color: #333;
}

.integral-calculator-container #clearBtn:hover {
    background-color: #e1e1e1;
}

.integral-calculator-container #exportCSVBtn {
    background-color: #28a745;
    color: #fff;
    border-radius: 6px;
    font-size: 12px;
    padding: 4px 8px;
}

.integral-calculator-container #exportCSVBtn:hover {
    filter: brightness(0.95);
}

.integral-calculator-container #exportCSVBtn:disabled {
    background-color: #cccccc;
    cursor: not-allowed;
}

.integral-calculator-container .result-section {
    background: white;
    border-radius: 8px;
    padding: 20px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    display: none;
}

.integral-calculator-container .result-header {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 1px solid #eee;
}

.integral-calculator-container .result-item {
    margin-bottom: 20px;
}

.integral-calculator-container .result-label {
    font-weight: 600;
    margin-bottom: 5px;
}

.integral-calculator-container .result-value {
    padding: 10px;
    background-color: #f9f9f9;
    border-radius: 4px;
    border-left: 3px solid #4a90e2;
}

.integral-calculator-container .steps-container {
    max-height: 400px;
    overflow-y: auto;
    padding: 10px;
    background-color: #f9f9f9;
    border-radius: 4px;
}

.integral-calculator-container .step {
    margin-bottom: 15px;
    padding-bottom: 15px;
    border-bottom: 1px solid #eee;
}

.integral-calculator-container .step:last-child {
    border-bottom: none;
}

.integral-calculator-container .step-number {
    display: inline-block;
    width: 24px;
    height: 24px;
    background-color: #4a90e2;
    color: white;
    border-radius: 50%;
    text-align: center;
    line-height: 24px;
    margin-right: 10px;
    font-size: 12px;
}

.integral-calculator-container .comment-box {
    background-color: #fff3cd;
    border: 1px solid #ffeaa7;
    border-radius: 4px;
    padding: 10px;
    margin-top: 15px;
}

.integral-calculator-container .error-message {
    color: #d9534f;
    background-color: #f8d7da;
    border: 1px solid #f5c6cb;
    border-radius: 4px;
    padding: 10px;
    margin-top: 10px;
    display: none;
}

.integral-calculator-container .loading {
    display: none;
    text-align: center;
    padding: 20px;
}

.integral-calculator-container .spinner {
    border: 4px solid #f3f3f3;
    border-top: 4px solid #4a90e2;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 2s linear infinite;
    margin: 0 auto 10px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.integral-calculator-container .precision-control {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-top: 10px;
}

.integral-calculator-container .precision-control label {
    margin-bottom: 0;
}

.integral-calculator-container .precision-control input {
    width: 80px;
}