:root {
    --primary-color: #006a4e; /* Bangladesh green */
    --secondary-color: #f42a41; /* Bangladesh red */
    --text-color: #333;
    --bg-color: #f9f9f9;
    --card-bg: #fff;
    --header-bg: rgba(0, 106, 78, 0.9);
    --footer-bg: #222;
    --footer-text: #ddd;
    --shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    --hover-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
    --transition: all 0.3s ease;
    --modal-transition: all 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
    --button-transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: var(--transition);
    position: relative;
    overflow-x: hidden;
}

/* Floating animation elements */
.floating-elements {
    position: fixed;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    z-index: -1;
    overflow: hidden;
}

.floating-element {
    position: absolute;
    border-radius: 50%;
    background: rgba(0, 106, 78, 0.05);
    animation: float 15s infinite linear;
}

.element-1 {
    width: 150px;
    height: 150px;
    top: 10%;
    left: 10%;
    animation-delay: 0s;
}

.element-2 {
    width: 200px;
    height: 200px;
    top: 60%;
    left: 80%;
    animation-delay: 2s;
}

.element-3 {
    width: 100px;
    height: 100px;
    top: 80%;
    left: 20%;
    animation-delay: 4s;
}

.element-4 {
    width: 250px;
    height: 250px;
    top: 30%;
    left: 50%;
    animation-delay: 6s;
}

@keyframes float {
    0% {
        transform: translateY(0) rotate(0deg);
    }
    50% {
        transform: translateY(-50px) rotate(180deg);
    }
    100% {
        transform: translateY(0) rotate(360deg);
    }
}

/* Header styles */
header {
    position: relative;
    height: 300px;
    overflow: hidden;
}

.header-image {
    position: relative;
    width: 100%;
    height: 100%;
    background: linear-gradient(rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.5)), 
                url('https://c4.wallpaperflare.com/wallpaper/587/47/657/jatiya-sangsad-bhaban-national-parliament-house-wallpaper-preview.jpg');
    background-size: cover;
    background-position: center;
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
}

.image-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(0, 106, 78, 0.3), rgba(244, 42, 65, 0.3));
}

.header-content {
    position: relative;
    z-index: 1;
    color: white;
    padding: 20px;
    max-width: 800px;
    animation: fadeInUp 1s ease;
}

.header-content h1 {
    font-size: 2.5rem;
    margin-bottom: 15px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
}

.header-content p {
    font-size: 1.1rem;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.5);
    animation: fadeInUp 1.5s ease;
}

@keyframes fadeInUp {
    from { 
        opacity: 0; 
        transform: translateY(30px); 
    }
    to { 
        opacity: 1; 
        transform: translateY(0); 
    }
}

/* Utility buttons container */
.utility-container {
    display: flex;
    justify-content: flex-end;
    padding: 20px;
    background-color: var(--bg-color);
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    animation: fadeIn 1s ease;
}

.utility-buttons {
    display: flex;
    gap: 15px;
    align-items: center;
}

.utility-btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    transition: var(--button-transition);
    box-shadow: var(--shadow);
    position: relative;
    overflow: hidden;
}

#language-btn {
    width: auto;
    padding: 0 15px;
    border-radius: 20px;
    gap: 5px;
}

#current-language {
    font-weight: bold;
    font-size: 0.9rem;
}

.utility-btn:hover {
    transform: scale(1.1);
    box-shadow: var(--hover-shadow);
}

.utility-btn::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 5px;
    height: 5px;
    background: rgba(255, 255, 255, 0.5);
    opacity: 0;
    border-radius: 100%;
    transform: scale(1, 1) translate(-50%, -50%);
    transform-origin: 50% 50%;
}

.utility-btn:focus:not(:active)::after {
    animation: ripple 0.6s ease-out;
}

@keyframes ripple {
    0% {
        transform: scale(0, 0);
        opacity: 0.5;
    }
    100% {
        transform: scale(20, 20);
        opacity: 0;
    }
}

/* Language selector */
.language-selector {
    position: relative;
}

.language-menu {
    position: absolute;
    top: 50px;
    right: 0;
    background-color: var(--card-bg);
    border-radius: 10px;
    padding: 10px;
    box-shadow: var(--shadow);
    display: none;
    width: 150px;
    z-index: 100;
    animation: fadeInUp 0.3s ease;
}

.language-menu.show {
    display: block;
}

.language-option {
    padding: 8px 10px;
    cursor: pointer;
    border-radius: 5px;
    transition: var(--transition);
    text-align: center;
}

.language-option:hover {
    background-color: var(--primary-color);
    color: white;
}

/* Main content */
main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    animation: fadeIn 0.8s ease;
}

/* Currency containers */
.currency-container {
    background-color: var(--card-bg);
    border-radius: 10px;
    padding: 20px;
    margin-bottom: 30px;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.section-title {
    text-align: center;
    margin-bottom: 30px;
    position: relative;
}

.title-decoration {
    display: inline-block;
    position: relative;
    padding: 0 20px;
}

.title-decoration h2 {
    font-size: 1.8rem;
    color: var(--primary-color);
    display: inline-block;
    padding: 0 15px;
    position: relative;
    z-index: 1;
}

.title-decoration::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: 40px;
    background: linear-gradient(90deg, transparent, var(--primary-color), transparent);
    opacity: 0.2;
    border-radius: 20px;
    transform: translateY(-50%);
    z-index: 0;
}

.title-decoration::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background-color: var(--secondary-color);
    border-radius: 3px;
}

/* Currency grid */
.currency-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 25px;
}

/* Currency card */
.currency-card {
    background-color: var(--card-bg);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    position: relative;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    height: 100%;
    transform: translateY(0);
}

.currency-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--hover-shadow);
}

.currency-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    opacity: 0;
    transition: var(--transition);
    z-index: 1;
}

.currency-card:hover::before {
    opacity: 0.1;
}

.currency-img {
    width: 100%;
    height: 180px;
    object-fit: contain;
    padding: 20px;
    background-color: #f5f5f5;
    border-bottom: 1px solid #eee;
    transition: var(--transition);
}

.currency-info {
    padding: 20px;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    text-align: center;
}

.currency-info h3 {
    color: var(--primary-color);
    margin-bottom: 10px;
    font-size: 1.3rem;
}

.currency-value {
    margin-bottom: 5px;
    font-size: 0.95rem;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.currency-value span {
    margin: 2px 0;
}

.details-btn {
    display: inline-block;
    margin-top: 15px;
    padding: 8px 15px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: var(--button-transition);
    font-weight: 500;
    align-self: center;
    position: relative;
    overflow: hidden;
}

.details-btn:hover {
    background-color: var(--secondary-color);
    transform: translateY(-2px);
}

.details-btn::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 5px;
    height: 5px;
    background: rgba(255, 255, 255, 0.5);
    opacity: 0;
    border-radius: 100%;
    transform: scale(1, 1) translate(-50%, -50%);
    transform-origin: 50% 50%;
}

.details-btn:focus:not(:active)::after {
    animation: ripple 0.6s ease-out;
}

/* Image frame effect */
.image-frame {
    padding: 10px;
    background: white;
    border: 1px solid #ddd;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    transition: var(--transition);
    display: inline-block;
    border-radius: 5px;
}

/* Modal styles */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    z-index: 1000;
    overflow-y: auto;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.modal.show {
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 1;
}

.modal-content {
    background-color: var(--card-bg);
    border-radius: 10px;
    width: 90%;
    max-width: 800px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
    transform: translateY(-50px) scale(0.95);
    transition: var(--modal-transition);
    position: relative;
}

.modal.show .modal-content {
    transform: translateY(0) scale(1);
}

.developer-content {
    max-width: 600px;
    padding: 20px;
}

.modal-header {
    padding: 20px;
    background-color: var(--primary-color);
    color: white;
    display: flex;
    justify-content: center;
    align-items: center;
    border-top-left-radius: 10px;
    border-top-right-radius: 10px;
    position: relative;
}

.modal-header h3 {
    margin: 0;
    font-size: 1.5rem;
    text-align: center;
}

.close-btn {
    background: none;
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
    transition: var(--button-transition);
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    position: absolute;
    right: 20px;
}

.close-btn:hover {
    background-color: rgba(255, 255, 255, 0.2);
    transform: rotate(90deg);
}

.modal-body {
    padding: 20px;
}

.modal-row {
    display: flex;
    gap: 20px;
}

.modal-img {
    flex: 1;
    min-width: 200px;
    background-color: #f5f5f5;
    border-radius: 5px;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.modal-img img {
    max-width: 100%;
    max-height: 300px;
    object-fit: contain;
    transition: var(--transition);
}

.modal-img img:hover {
    transform: scale(1.02);
}

.modal-details {
    flex: 2;
}

.detail-item {
    display: flex;
    align-items: flex-start;
    margin-bottom: 15px;
    transition: var(--transition);
}

.detail-item:hover {
    transform: translateX(5px);
}

.detail-item i {
    color: var(--primary-color);
    margin-right: 10px;
    margin-top: 3px;
    font-size: 1.1rem;
    min-width: 20px;
}

.detail-item p {
    margin: 0;
    line-height: 1.6;
}

.detail-item strong {
    color: var(--primary-color);
}

/* Currency converter modal */
.converter-container {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    justify-content: center;
    align-items: center;
    margin-bottom: 20px;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}

.converter-input {
    display: flex;
    flex-direction: column;
    gap: 10px;
    flex: 1;
    min-width: 200px;
}

.converter-input select, 
.converter-input input {
    padding: 10px 15px;
    border-radius: 5px;
    border: 1px solid #ddd;
    background-color: var(--card-bg);
    color: var(--text-color);
    font-size: 1rem;
    transition: var(--transition);
    width: 100%;
}

.converter-input select:focus, 
.converter-input input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(0, 106, 78, 0.2);
}

.converter-input input {
    width: 100%;
}

.converter-swap {
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    transition: var(--button-transition);
    position: relative;
    overflow: hidden;
    flex-shrink: 0;
}

.converter-swap:hover {
    background-color: var(--secondary-color);
    transform: rotate(180deg);
}

.converter-result {
    font-size: 1.2rem;
    font-weight: bold;
    color: var(--primary-color);
    text-align: center;
    animation: fadeIn 0.5s ease;
    margin-bottom: 10px;
}

.converter-info {
    text-align: center;
    font-size: 0.9rem;
    color: var(--text-color);
    opacity: 0.8;
}

/* Developer modal */
.developer-info {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.info-section {
    margin-bottom: 15px;
}

.info-content {
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.info-icon {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.info-content h4 {
    color: var(--primary-color);
    margin-bottom: 8px;
    font-size: 1.1rem;
}

.info-box {
    background-color: rgba(0, 106, 78, 0.1);
    border-radius: 8px;
    padding: 15px;
    margin-top: 5px;
    width: 100%;
    max-width: 500px;
}

.info-box p {
    margin-bottom: 5px;
    line-height: 1.6;
}

.developer-contact {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 15px;
    background-color: rgba(0, 106, 78, 0.1);
    border-radius: 5px;
    transition: var(--transition);
    justify-content: center;
}

.contact-item:hover {
    background-color: rgba(0, 106, 78, 0.2);
    transform: translateY(-2px);
}

.contact-item i {
    color: var(--primary-color);
    font-size: 1.2rem;
}

.social-links {
    display: flex;
    gap: 15px;
    margin-top: 10px;
    justify-content: center;
}

.social-link {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    transition: var(--button-transition);
    position: relative;
    overflow: hidden;
}

.social-link.facebook {
    background-color: #3b5998;
    color: white;
}

.social-link.linkedin {
    background-color: #0077b5;
    color: white;
}

.social-link.github {
    background-color: #333;
    color: white;
}

.social-link.globe {
    background-color: #555;
    color: white;
}

.social-link:hover {
    transform: translateY(-3px) scale(1.1);
}

/* Footer */
footer {
    background-color: var(--footer-bg);
    color: var(--footer-text);
    text-align: center;
    padding: 20px;
    margin-top: 40px;
    animation: fadeIn 1s ease;
}

footer p {
    font-size: 0.9rem;
}

footer b {
    color: white;
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* Responsive design */
@media (max-width: 768px) {
    .header-content h1 {
        font-size: 2rem;
    }

    .header-content p {
        font-size: 1rem;
    }

    .utility-buttons {
        gap: 10px;
    }

    .currency-grid {
        grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    }

    .modal-row {
        flex-direction: column;
    }

    .modal-img {
        min-width: 100%;
    }
    
    .developer-content {
        width: 90%;
    }
    
    .info-section {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
    
    .info-icon {
        margin-bottom: 5px;
    }
    
    .title-decoration h2 {
        font-size: 1.4rem;
    }

    #language-btn {
        padding: 0 10px;
    }
}

@media (max-width: 480px) {
    .header-content h1 {
        font-size: 1.8rem;
    }

    .section-title h2 {
        font-size: 1.5rem;
    }

    .currency-grid {
        grid-template-columns: 1fr;
    }

    .converter-container {
        flex-direction: column;
    }
    
    .utility-buttons {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .title-decoration::before {
        height: 30px;
    }
    
    .title-decoration h2 {
        font-size: 1.4rem;
    }
}