:root {
    --primary-color: #4361ee;
    --primary-light: #e0e7ff;
    --secondary-color: #3f37c9;
    --accent-color: #4895ef;
    --light-color: #f8f9fa;
    --dark-color: #212529;
    --success-color: #4cc9f0;
    --warning-color: #f72585;
    --border-radius: 12px;
    --box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
    --favorite-color: #ffd700;
}

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

body {
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    color: var(--dark-color);
}

.app-container {
    width: 100%;
    max-width: 900px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.converter-container {
    background-color: white;
    border-radius: var(--border-radius);
    padding: 30px;
    box-shadow: var(--box-shadow);
    transition: var(--transition);
    position: relative;
}

.app-header {
    text-align: center;
    margin-bottom: 30px;
    position: relative;
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    margin-bottom: 10px;
}

.app-logo {
    width: 50px;
    height: 50px;
    object-fit: contain;
}

.app-header h1 {
    color: var(--primary-color);
    font-size: 28px;
    margin-bottom: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.header-actions {
    position: absolute;
    top: 0;
    right: 0;
    display: flex;
    gap: 10px;
}

.header-actions button {
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 20px;
    padding: 8px 15px;
    font-size: 12px;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 5px;
}

.header-actions button:hover {
    background-color: var(--secondary-color);
    transform: translateY(-2px);
}

.last-updated {
    color: #6c757d;
    font-size: 14px;
    font-weight: 500;
}

.amount-section {
    margin-bottom: 25px;
}

.amount-section label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--dark-color);
}

.input-group {
    position: relative;
    display: flex;
    align-items: center;
}

.input-group input {
    width: 100%;
    padding: 15px 20px;
    border: 2px solid #e9ecef;
    border-radius: var(--border-radius);
    font-size: 18px;
    font-weight: 600;
    transition: var(--transition);
}

.input-group input:focus {
    border-color: var(--primary-color);
    outline: none;
    box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.2);
}

.clear-btn {
    position: absolute;
    right: 15px;
    background: none;
    border: none;
    color: #6c757d;
    cursor: pointer;
    transition: var(--transition);
}

.clear-btn:hover {
    color: var(--warning-color);
}

.currency-dropdowns {
    display: flex;
    align-items: flex-end;
    gap: 15px;
    margin-bottom: 30px;
}

.from-currency,
.to-currency {
    flex: 1;
}

.currency-dropdowns label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--dark-color);
}

.currency-select {
    position: relative;
    display: flex;
    align-items: center;
    border: 2px solid #e9ecef;
    border-radius: var(--border-radius);
    padding: 8px 15px;
    transition: var(--transition);
}

.currency-select:hover {
    border-color: var(--primary-color);
}

.currency-select img {
    width: 30px;
    height: 20px;
    margin-right: 10px;
    object-fit: cover;
    border-radius: 3px;
}

.currency-selector {
    flex: 1;
    border: none;
    background: none;
    font-size: 16px;
    font-weight: 600;
    color: var(--dark-color);
    cursor: pointer;
    appearance: none;
    padding: 5px 0;
}

.currency-selector:focus {
    outline: none;
}

.currency-select i {
    color: #6c757d;
    margin-left: 10px;
}

.swap-btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    margin-bottom: 8px;
}

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

.result-section {
    background-color: #f8f9fa;
    border-radius: var(--border-radius);
    padding: 20px;
    margin-bottom: 25px;
    text-align: center;
}

.conversion-result {
    font-size: 24px;
    font-weight: 700;
    color: var(--dark-color);
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 5px;
}

.amount-display,
.converted-amount {
    color: var(--primary-color);
}

.rate-info {
    display: flex;
    flex-direction: column;
    gap: 5px;
    color: #6c757d;
    font-size: 14px;
}

.inverse-rate {
    font-size: 13px;
    opacity: 0.8;
}

.action-buttons {
    display: flex;
    gap: 15px;
    margin-bottom: 25px;
}

.convert-btn,
.details-btn,
.save-favorite {
    flex: 1;
    padding: 15px;
    border-radius: var(--border-radius);
    border: none;
    font-weight: 600;
    font-size: 16px;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.convert-btn {
    background-color: var(--primary-color);
    color: white;
}

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

.details-btn {
    background-color: white;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.details-btn:hover {
    background-color: #f0f4ff;
}

.save-favorite {
    background-color: var(--primary-light);
    color: var(--dark-color);
    border: 2px solid var(--primary-light);
}

.save-favorite:hover {
    background-color: var(--favorite-color);
    border-color: var(--favorite-color);
}

.save-favorite.active {
    background-color: var(--favorite-color);
    border-color: var(--favorite-color);
}

.favorites-section {
    margin-bottom: 25px;
}

.favorites-section h3 {
    margin-bottom: 15px;
    color: var(--dark-color);
    font-size: 16px;
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.favorites-list {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
}

.favorite-item {
    padding: 8px 15px;
    border-radius: 20px;
    background-color: var(--favorite-color);
    border: 1px solid var(--favorite-color);
    font-size: 14px;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 5px;
}

.favorite-item:hover {
    transform: translateY(-2px);
}

.favorite-item .remove-favorite {
    background: none;
    border: none;
    color: var(--dark-color);
    cursor: pointer;
    font-size: 12px;
    opacity: 0.7;
    transition: var(--transition);
}

.favorite-item .remove-favorite:hover {
    opacity: 1;
    color: var(--warning-color);
}

.popular-conversions h3 {
    margin-bottom: 15px;
    color: var(--dark-color);
    font-size: 16px;
    text-align: center;
}

.popular-pairs {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
}

.popular-pair {
    padding: 8px 15px;
    border-radius: 20px;
    background-color: white;
    border: 1px solid #e9ecef;
    font-size: 14px;
    cursor: pointer;
    transition: var(--transition);
}

.popular-pair:hover {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
    transform: translateY(-2px);
}

.historical-chart {
    background-color: white;
    border-radius: var(--border-radius);
    padding: 25px;
    box-shadow: var(--box-shadow);
    transition: var(--transition);
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 90%;
    max-width: 800px;
    max-height: 90vh;
    overflow-y: auto;
    z-index: 100;
}

.historical-chart.hidden {
    display: none;
}

.chart-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.chart-header h3 {
    color: var(--dark-color);
}

.close-chart {
    background: none;
    border: none;
    font-size: 18px;
    color: #6c757d;
    cursor: pointer;
    transition: var(--transition);
}

.close-chart:hover {
    color: var(--warning-color);
}

.chart-container {
    height: 300px;
    margin-bottom: 20px;
}

.time-periods {
    display: flex;
    gap: 10px;
    justify-content: center;
    flex-wrap: wrap;
}

.time-period {
    padding: 8px 15px;
    border-radius: 20px;
    background-color: white;
    border: 1px solid #e9ecef;
    font-size: 14px;
    cursor: pointer;
    transition: var(--transition);
}

.time-period:hover,
.time-period.active {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.all-currencies-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.all-currencies-modal.show {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background-color: white;
    border-radius: var(--border-radius);
    padding: 25px;
    width: 90%;
    max-width: 800px;
    max-height: 80vh;
    overflow-y: auto;
    box-shadow: var(--box-shadow);
    position: relative;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.modal-header h3 {
    color: var(--dark-color);
}

.close-modal {
    background: none;
    border: none;
    font-size: 18px;
    color: #6c757d;
    cursor: pointer;
    transition: var(--transition);
}

.close-modal:hover {
    color: var(--warning-color);
}

.search-container {
    position: relative;
    margin-bottom: 20px;
}

.search-container input {
    width: 100%;
    padding: 12px 15px 12px 40px;
    border: 2px solid #e9ecef;
    border-radius: var(--border-radius);
    font-size: 16px;
    transition: var(--transition);
}

.search-container input:focus {
    border-color: var(--primary-color);
    outline: none;
    box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.2);
}

.search-container i {
    position: absolute;
    left: 15px;
    top: 50%;
    transform: translateY(-50%);
    color: #6c757d;
}

.currencies-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: 15px;
}

.currency-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 15px;
    border-radius: var(--border-radius);
    background-color: #f8f9fa;
    transition: var(--transition);
    cursor: pointer;
}

.currency-card:hover {
    background-color: var(--primary-light);
    transform: translateY(-3px);
}

.currency-card img {
    width: 40px;
    height: 25px;
    object-fit: cover;
    border-radius: 3px;
    margin-bottom: 8px;
}

.currency-card .currency-code {
    font-weight: 600;
    margin-bottom: 3px;
}

.currency-card .currency-name {
    font-size: 12px;
    color: #6c757d;
    text-align: center;
}

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

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

/* Animations */
.animate-bounce {
    animation: bounce 0.5s;
}

@keyframes bounce {

    0%,
    100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-5px);
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    .currency-dropdowns {
        flex-direction: column;
        gap: 20px;
    }

    .swap-btn {
        margin: 0 auto;
        transform: rotate(90deg);
        margin-top: 25px;
    }

    .action-buttons {
        flex-direction: column;
    }

    .conversion-result {
        font-size: 20px;
    }

    .currencies-grid {
        grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    }
}

@media (max-width: 480px) {
    .converter-container {
        padding: 20px;
    }

    .currency-dropdowns {
        display: block;
    }

    .app-header h1 {
        font-size: 24px;
    }

    .conversion-result {
        font-size: 18px;
    }

    .popular-pairs {
        flex-direction: column;
        align-items: center;
    }

    .popular-pair {
        width: 100%;
        text-align: center;
    }

    .header-actions {
        position: static;
        justify-content: center;
        margin-bottom: 15px;
    }

    .header-content {
        flex-direction: column;
    }

    .app-logo {
        margin-bottom: 10px;
    }

    .currencies-grid {
        grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
    }
}