.box-price-calculator {
    font-family: 'Roboto', sans-serif;
    max-width: 850px;
    margin: 30px auto;
    padding: 35px;
    border-radius: 18px;
    background-color: #f9fbfd;
    box-shadow: 0 15px 45px rgba(0, 0, 0, 0.15);
    color: #333;
    line-height: 1.6;
    border: 1px solid #e0e0e0;
}

.box-price-calculator h2 {
    text-align: center;
    color: #2c3e50;
    margin-bottom: 35px;
    font-size: 2.2em;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.box-price-calculator label {
    display: block;
    margin-bottom: 10px;
    font-weight: 600;
    color: #444;
    font-size: 0.98em;
    transition: color 0.2s ease;
}

.box-price-calculator select,
.box-price-calculator input[type="number"] {
    width: calc(100% - 24px);
    padding: 14px;
    margin-bottom: 25px;
    border: 1px solid #c0c0c0;
    border-radius: 10px;
    box-sizing: border-box;
    font-size: 1.05em;
    color: #555;
    background-color: #ffffff;
    transition: all 0.3s ease;
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
}

.box-price-calculator select:focus,
.box-price-calculator input[type="number"]:focus {
    border-color: #3498db;
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.2);
    outline: none;
    background-color: #fff;
}

.box-price-calculator .options-group {
    margin-bottom: 25px;
    padding: 15px;
    background-color: #f9f9f9;
    border-radius: 10px;
    border: 1px solid #eee;
}

.box-price-calculator .options-group h3 {
    color: #4A90E2;
    margin-top: 0;
    margin-bottom: 15px;
    font-size: 1.2em;
}

.box-price-calculator .checkbox-group label {
    display: inline-block;
    margin-right: 15px;
    margin-bottom: 10px;
    font-weight: normal;
}

.box-price-calculator .checkbox-group input[type="checkbox"] {
    margin-right: 8px;
    transform: scale(1.1);
}

.box-price-calculator .result {
    background-color: #eaf7ff;
    padding: 25px;
    border-radius: 12px;
    text-align: center;
    font-size: 1.4em;
    color: #2c3e50;
    margin-top: 30px;
    border: 1px solid #cce0ff;
    font-weight: 500;
}

.box-price-calculator .result span#estimated-price {
    font-weight: 700;
    color: #e74c3c;
    font-size: 1.6em;
    display: block;
    margin-bottom: 8px;
}

.box-price-calculator .result p#price-message {
    font-size: 0.9em;
    margin-top: 5px;
    line-height: 1.4;
}

.box-price-calculator button#calculate-price {
    display: block;
    width: 100%;
    padding: 18px;
    background-color: #2ecc71;
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 1.25em;
    font-weight: bold;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.2s ease, box-shadow 0.3s ease;
    margin-top: 35px;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    outline: none;
}

.box-price-calculator button#calculate-price:hover {
    background-color: #27ae60;
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(46, 204, 113, 0.3);
}

.box-price-calculator button#calculate-price:active {
    transform: translateY(0);
    box-shadow: none;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .box-price-calculator {
        padding: 25px;
        margin: 20px auto;
    }

    .box-price-calculator h2 {
        font-size: 1.8em;
    }

    .tabs-nav {
        flex-wrap: wrap;
    }

    .tab-button {
        flex-basis: 50%;
        padding: 14px 5px;
        font-size: 0.95em;
    }

    .tab-content {
        padding: 20px;
    }

    .box-price-calculator select,
    .box-price-calculator input[type="number"] {
        padding: 12px;
    }

    .box-price-calculator button#calculate-price {
        padding: 15px;
        font-size: 1.1em;
    }

    .box-price-calculator .result {
        font-size: 1.2em;
        padding: 20px;
    }

    .box-price-calculator .result span#estimated-price {
        font-size: 1.4em;
    }
}

@media (max-width: 480px) {
    .tab-button {
        flex-basis: 100%;
    }
}

/* Accordion Styles */
.accordion-item {
    border: 1px solid #eee;
    border-radius: 10px;
    margin-bottom: 10px;
    overflow: hidden;
    background-color: #fcfcfc;
}

.accordion-header {
    background-color: #4A90E2;
    color: white;
    padding: 15px 20px;
    width: 100%;
    text-align: left;
    border: none;
    outline: none;
    cursor: pointer;
    font-size: 1.1em;
    font-weight: bold;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background-color 0.3s ease;
}

.accordion-header:hover {
    background-color: #357ABD;
}

.accordion-header.active {
    background-color: #357ABD;
    border-bottom-left-radius: 0;
    border-bottom-right-radius: 0;
}

.accordion-header::after {
    content: '\002B';
    font-weight: bold;
    font-size: 1.2em;
    transition: transform 0.3s ease;
}

.accordion-header.active::after {
    content: "\2212";
    transform: rotate(180deg);
}

.accordion-content {
    padding: 15px 20px;
    background-color: #ffffff;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out, padding 0.3s ease-out;
    box-sizing: border-box;
}

.accordion-header.active + .accordion-content {
    max-height: 500px;
    padding: 15px 20px;
}

.accordion-content label {
    margin-top: 10px;
}

.accordion-content select,
.accordion-content input[type="number"] {
    margin-bottom: 15px;
}

.accordion-content .checkbox-group label {
    margin-bottom: 5px;
    font-size: 1em;
}

/* Tab Styles */
.tabs-container {
    background-color: #ffffff;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.07);
    margin-bottom: 30px;
    border: 1px solid #e9e9e9;
    overflow: hidden;
}

.tabs-nav {
    display: flex;
    justify-content: space-around;
    border-bottom: 1px solid #e0e0e0;
    background-color: #eef4f9;
    border-top-left-radius: 12px;
    border-top-right-radius: 12px;
    overflow: hidden;
    padding: 0;
    margin: 0;
}

.tab-button {
    flex-grow: 1;
    padding: 18px 10px;
    border: none;
    background-color: transparent;
    font-size: 1.05em;
    font-weight: 600;
    color: #667a8f;
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: center;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    position: relative;
    outline: none;
}

.tab-button:hover {
    color: #3498db;
    background-color: #e2eff7;
}

.tab-button.active {
    color: #3498db;
    background-color: #ffffff;
    border-bottom: 3px solid #3498db;
    font-weight: 700;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
    z-index: 1;
}

.tab-content {
    padding: 25px 30px;
    display: none;
    background-color: #ffffff;
    border-bottom-left-radius: 12px;
    border-bottom-right-radius: 12px;
    animation: fadeIn 0.4s ease-out;
}

.tab-content.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(15px); }
    to { opacity: 1; transform: translateY(0); }
}

.tab-content label {
    margin-top: 15px;
}

.tab-content select,
.tab-content input[type="number"] {
    margin-bottom: 15px;
}

.tab-content .checkbox-group label {
    margin-bottom: 10px;
    font-size: 1em;
}

/* Checkbox group styling */
.checkbox-group label {
    display: flex;
    align-items: center;
    margin-bottom: 12px;
    font-weight: normal;
    font-size: 1em;
    color: #555;
    cursor: pointer;
}

.checkbox-group input[type="checkbox"] {
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border: 2px solid #ccc;
    border-radius: 6px;
    margin-right: 12px;
    outline: none;
    cursor: pointer;
    position: relative;
    transition: all 0.2s ease;
    flex-shrink: 0;
}

.checkbox-group input[type="checkbox"]:checked {
    background-color: #3498db;
    border-color: #3498db;
}

.checkbox-group input[type="checkbox"]:checked::after {
    content: '\2713';
    display: block;
    color: white;
    font-size: 14px;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.checkbox-group input[type="checkbox"]:focus {
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.3);
}