/* FD Calculator Styles */
:root {
    --primary-color: #4361ee;
    --secondary-color: #3a0ca3;
    --accent-color: #f72585;
    --text-color: #333;
    --light-text: #777;
    --background-color: #f9f9f9;
    --white: #ffffff;
    --card-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease-in-out;
}

/* Calculator Container Styles */
.calculator-container {
    background-color: var(--white);
    border-radius: 15px;
    box-shadow: var(--card-shadow);
    margin-bottom: 2rem;
    overflow: hidden;
}

.calculator-header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--white);
    padding: 1.5rem;
    text-align: center;
    font-size: 1.5rem;
    font-weight: 600;
}

.calculator-body {
    padding: 2rem;
}

/* Tab Navigation */
.tab-nav {
    display: flex;
    border-bottom: 1px solid #e1e1e1;
    margin-bottom: 2rem;
}

.tab {
    padding: 1rem 1.5rem;
    cursor: pointer;
    font-weight: 600;
    transition: var(--transition);
    border-bottom: 3px solid transparent;
    color: var(--light-text);
}

.tab:hover {
    color: var(--primary-color);
}

.tab.active {
    color: var(--primary-color);
    border-bottom: 3px solid var(--primary-color);
}

/* Input Panel Styles */
.input-panel {
    display: none;
}

.input-panel.active {
    display: block;
}

.input-group {
    margin-bottom: 1.5rem;
}

.input-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--text-color);
}

input[type="number"], 
.form-select {
    width: 100%;
    padding: 0.8rem 1rem;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 1rem;
    transition: var(--transition);
}

input[type="number"]:focus, 
.form-select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.2);
}

.input-addon {
    position: relative;
}

.input-addon input {
    padding-right: 2.5rem;
}

.input-addon::after {
    content: attr(data-suffix);
    position: absolute;
    right: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--light-text);
    font-weight: 600;
}

/* Button Styles */
.btn-calculate {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--white);
    border: none;
    padding: 1rem 2rem;
    border-radius: 30px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: block;
    width: 100%;
    text-align: center;
    margin: 1.5rem 0;
    box-shadow: 0 5px 15px rgba(67, 97, 238, 0.3);
}

.btn-calculate:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(67, 97, 238, 0.4);
}

/* Results Container Styles */
.results-container {
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid #e1e1e1;
}

.result-card {
    background-color: #f8f9fa;
    border-radius: 10px;
    padding: 1.5rem;
    text-align: center;
    transition: var(--transition);
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.05);
    height: 100%;
}

.result-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 15px rgba(0, 0, 0, 0.1);
}

.result-header {
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.result-value {
    color: var(--secondary-color);
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.result-description {
    color: var(--light-text);
    font-size: 0.9rem;
}

.chart-container {
    margin-top: 2rem;
    background-color: #f8f9fa;
    border-radius: 10px;
    padding: 1.5rem;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.05);
}

/* Calculator Info Styles */
.calculator-info {
    background-color: var(--white);
    border-radius: 15px;
    box-shadow: var(--card-shadow);
    padding: 2rem;
    margin-bottom: 3rem;
}

.calculator-info h2 {
    color: var(--secondary-color);
    margin-bottom: 1.5rem;
    font-size: 1.8rem;
}

.calculator-info h3 {
    color: var(--primary-color);
    margin: 2rem 0 1rem;
    font-size: 1.4rem;
}

.calculator-info p {
    margin-bottom: 1rem;
    color: var(--text-color);
    line-height: 1.7;
}

.calculator-info ul,
.calculator-info ol {
    margin-left: 1.5rem;
    margin-bottom: 1rem;
}

.calculator-info li {
    margin-bottom: 0.5rem;
    color: var(--text-color);
    line-height: 1.7;
}

/* Related Calculators */
.related-calculators {
    padding: 3rem 0;
    background-color: #f0f0f0;
}

.related-calculators h2 {
    text-align: center;
    margin-bottom: 2rem;
    color: var(--secondary-color);
    font-size: 2rem;
}

.related-calculators .calculator-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 2rem;
}

.related-calculators .calculator-card {
    background-color: var(--white);
    border-radius: 15px;
    padding: 2rem;
    text-align: center;
    transition: var(--transition);
    box-shadow: var(--card-shadow);
    position: relative;
    overflow: hidden;
    z-index: 1;
}

.related-calculators .calculator-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(67, 97, 238, 0.1), rgba(247, 37, 133, 0.1));
    opacity: 0;
    z-index: -1;
    transition: var(--transition);
}

.related-calculators .calculator-card:hover {
    transform: translateY(-15px) scale(1.03);
    box-shadow: 0 20px 30px rgba(0, 0, 0, 0.15), 
                0 0 20px rgba(67, 97, 238, 0.2);
    border-color: rgba(67, 97, 238, 0.2);
}

.related-calculators .calculator-card:hover::before {
    opacity: 1;
}

.related-calculators .calculator-card .card-icon {
    background: rgba(67, 97, 238, 0.1);
    width: 70px;
    height: 70px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    transition: var(--transition);
}

.related-calculators .calculator-card:hover .card-icon {
    background: rgba(67, 97, 238, 0.2);
    transform: scale(1.1);
}

.related-calculators .calculator-card .card-icon i {
    font-size: 2rem;
    color: var(--primary-color);
    transition: var(--transition);
}

.related-calculators .calculator-card:hover .card-icon i {
    color: var(--accent-color);
}

.related-calculators .calculator-card h3 {
    color: var(--secondary-color);
    margin-bottom: 1rem;
    font-size: 1.3rem;
    transition: var(--transition);
}

.related-calculators .calculator-card:hover h3 {
    color: var(--accent-color);
}

.related-calculators .calculator-card p {
    color: var(--light-text);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.related-calculators .calculator-card .secondary-btn {
    display: inline-block;
    padding: 10px 25px;
    border-radius: 30px;
    background: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.9rem;
    transition: var(--transition);
}

.related-calculators .calculator-card:hover .secondary-btn {
    background: var(--primary-color);
    color: var(--white);
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(67, 97, 238, 0.3);
}

/* About Section */
.about-section {
    padding: 5rem 0;
    background-color: var(--white);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
}

.about-image {
    position: relative;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: var(--card-shadow);
}

.about-image img {
    width: 100%;
    height: auto;
    display: block;
    transition: var(--transition);
}

.about-text h2 {
    color: var(--secondary-color);
    margin-bottom: 1.5rem;
    font-size: 2.2rem;
}

.about-text p {
    margin-bottom: 1.5rem;
    color: var(--text-color);
    line-height: 1.8;
}

.about-features {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin-top: 2rem;
}

.about-feature {
    display: flex;
    align-items: center;
}

.about-feature i {
    background: rgba(67, 97, 238, 0.1);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 1rem;
    color: var(--primary-color);
    font-size: 1.2rem;
}

/* Responsive Styles */
@media screen and (max-width: 992px) {
    .about-content {
        grid-template-columns: 1fr;
    }
    
    .about-image {
        margin-bottom: 2rem;
    }
}

@media screen and (max-width: 768px) {
    .calculator-header {
        padding: 1.2rem;
        font-size: 1.3rem;
    }
    
    .calculator-body {
        padding: 1.5rem;
    }
    
    .tab-nav {
        flex-wrap: wrap;
    }
    
    .tab {
        padding: 0.8rem 1.2rem;
        font-size: 0.9rem;
    }
    
    .result-value {
        font-size: 1.5rem;
    }
    
    .about-features {
        grid-template-columns: 1fr;
    }
    
    .related-calculators .calculator-grid {
        grid-template-columns: 1fr;
    }
}

@media screen and (max-width: 576px) {
    .tab {
        flex: 1;
        text-align: center;
        padding: 0.8rem 0.5rem;
        font-size: 0.8rem;
    }
    
    .calculator-info h2 {
        font-size: 1.5rem;
    }
    
    .calculator-info h3 {
        font-size: 1.2rem;
    }
}

/* Mobile Menu Styles */
.mobile-menu {
    position: fixed;
    top: 0;
    right: -300px;
    width: 280px;
    height: 100%;
    background: var(--white);
    z-index: 1000;
    box-shadow: -5px 0 15px rgba(0, 0, 0, 0.1);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

.mobile-menu.active {
    right: 0;
}

.mobile-menu-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.2rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--white);
}

.mobile-menu-close {
    background: transparent;
    border: none;
    color: var(--white);
    font-size: 1.2rem;
    cursor: pointer;
}

.mobile-menu-content {
    flex: 1;
    overflow-y: auto;
    padding: 1rem;
}

.mobile-menu-content ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.mobile-menu-content ul li {
    margin-bottom: 1rem;
}

.mobile-menu-content ul li a {
    display: block;
    padding: 0.8rem 1rem;
    color: var(--text-color);
    text-decoration: none;
    border-radius: 5px;
    transition: var(--transition);
    font-weight: 500;
}

.mobile-menu-content ul li a:hover {
    background-color: rgba(67, 97, 238, 0.1);
    color: var(--primary-color);
}

.mobile-menu-toggle {
    background: transparent;
    border: none;
    color: var(--primary-color);
    font-size: 1.5rem;
    cursor: pointer;
}

.overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 999;
}

.overlay.active {
    opacity: 1;
    visibility: visible;
}