:root {
    --primary-blue: #2196F3;
    --success-green: #4CAF50;
    --warning-yellow: #FFC107;
    --error-red: #F44336;
    --accent-purple: #9C27B0;
    --background-light: #f8f9fa;
    --background-dark: #ffffff;
    --text-primary: #212529;
    --text-secondary: #6c757d;
    --border-color: #dee2e6;
    --shadow: 0 2px 10px rgba(0,0,0,0.1);
    --shadow-hover: 0 4px 20px rgba(0,0,0,0.15);
    --border-radius: 12px;
    --transition: all 0.3s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, var(--background-light) 0%, #e3f2fd 100%);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    padding-bottom: 80px;
}

.header {
    background: var(--background-dark);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 3px solid var(--primary-blue);
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.header h1 {
    color: var(--primary-blue);
    font-size: 1.5rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.connection-status {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    font-size: 0.9rem;
    font-weight: 500;
    transition: var(--transition);
}

.connection-status.online {
    background: #e8f5e8;
    color: var(--success-green);
}

.connection-status.offline {
    background: #ffeaa7;
    color: #d63031;
}

.main-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem;
}

.section {
    display: none;
    animation: fadeIn 0.3s ease;
}

.section.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.converter-container {
    max-width: 600px;
    margin: 0 auto;
}

.last-update {
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 1.5rem;
    padding: 0.5rem;
    background: var(--background-dark);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
}

.conversion-card {
    background: var(--background-dark);
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: var(--shadow);
    margin-bottom: 1.5rem;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.conversion-card:hover {
    box-shadow: var(--shadow-hover);
}

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

.currency-input:last-of-type {
    margin-bottom: 0;
}

.currency-selector {
    margin-bottom: 1rem;
}

.currency-select {
    width: 100%;
    padding: 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    background: var(--background-light);
    font-size: 1rem;
    color: var(--text-primary);
    transition: var(--transition);
    cursor: pointer;
}

.currency-select:focus {
    outline: none;
    border-color: var(--primary-blue);
    background: var(--background-dark);
}

.amount-input {
    width: 100%;
    padding: 1.2rem;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 1.5rem;
    text-align: center;
    background: var(--background-light);
    color: var(--text-primary);
    transition: var(--transition);
}

.amount-input:focus {
    outline: none;
    border-color: var(--primary-blue);
    background: var(--background-dark);
}

.amount-input[readonly] {
    background: #e9ecef;
    color: var(--success-green);
    font-weight: 600;
}

.swap-button {
    display: block;
    margin: 1rem auto;
    width: 60px;
    height: 60px;
    border: none;
    border-radius: 50%;
    background: var(--primary-blue);
    color: white;
    font-size: 1.2rem;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow);
}

.swap-button:hover {
    background: #1976D2;
    transform: rotate(180deg);
    box-shadow: var(--shadow-hover);
}

.conversion-rate {
    text-align: center;
    padding: 1rem;
    background: var(--background-light);
    border-radius: var(--border-radius);
    color: var(--text-secondary);
    font-size: 0.95rem;
    border: 1px solid var(--border-color);
}

.history-container {
    max-width: 800px;
    margin: 0 auto;
}

.history-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.history-header h2 {
    color: var(--primary-blue);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.history-controls {
    display: flex;
    gap: 1rem;
    align-items: center;
    flex-wrap: wrap;
}

.history-buttons {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.search-input {
    padding: 0.7rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 0.9rem;
    width: 200px;
    transition: var(--transition);
}

.search-input:focus {
    outline: none;
    border-color: var(--primary-blue);
}

.export-button,
.import-button {
    padding: 0.5rem;
    background: var(--primary-blue);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 0.9rem;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
}

.export-button:hover,
.import-button:hover {
    background: #1976D2;
    transform: translateY(-1px);
}

.clear-button {
    padding: 0.7rem 1rem;
    background: var(--error-red);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 0.9rem;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.clear-button:hover {
    background: #d32f2f;
}

.history-list {
    background: var(--background-dark);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    max-height: 500px;
    overflow-y: auto;
}

.history-item {
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition);
}

.history-item:hover {
    background: var(--background-light);
}

.history-item:last-child {
    border-bottom: none;
}

.history-conversion {
    flex: 1;
}

.history-amount {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.2rem;
}

.history-rate {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.history-date {
    font-size: 0.8rem;
    color: var(--text-secondary);
    text-align: right;
}

.empty-history {
    text-align: center;
    padding: 3rem;
    color: var(--text-secondary);
}

.empty-history i {
    font-size: 3rem;
    margin-bottom: 1rem;
    color: var(--border-color);
}

.travel-container {
    max-width: 800px;
    margin: 0 auto;
}

.travel-container h2 {
    color: var(--primary-blue);
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.travel-description {
    color: var(--text-secondary);
    margin-bottom: 2rem;
    font-size: 0.95rem;
}

.travel-input {
    background: var(--background-dark);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
    border: 1px solid var(--border-color);
}

.base-currency {
    margin-bottom: 1rem;
}

.base-currency label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-primary);
}

.travel-results {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1rem;
}

.travel-result-card {
    background: var(--background-dark);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.travel-result-card:hover {
    box-shadow: var(--shadow-hover);
    transform: translateY(-2px);
}

.travel-currency {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.travel-amount {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--success-green);
    margin-bottom: 0.3rem;
}

.travel-rate {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.faq-container {
    max-width: 800px;
    margin: 0 auto;
}

.faq-container h2 {
    color: var(--primary-blue);
    margin-bottom: 2rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.faq-item {
    background: var(--background-dark);
    border-radius: var(--border-radius);
    margin-bottom: 1rem;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
    overflow: hidden;
}

.faq-question {
    width: 100%;
    padding: 1.2rem;
    background: none;
    border: none;
    text-align: left;
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition);
}

.faq-question:hover {
    background: var(--background-light);
}

.faq-question[aria-expanded="true"] {
    background: var(--primary-blue);
    color: white;
}

.faq-icon {
    font-size: 1.2rem;
    font-weight: bold;
    transition: var(--transition);
}

.faq-question[aria-expanded="true"] .faq-icon {
    transform: rotate(45deg);
}

.faq-answer {
    padding: 0 1.2rem;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, padding 0.3s ease;
}

.faq-answer.show {
    padding: 1.2rem;
    max-height: 200px;
}

.faq-answer p {
    color: var(--text-secondary);
    line-height: 1.6;
}

.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--background-dark);
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-around;
    padding: 0.5rem 0;
    box-shadow: 0 -2px 10px rgba(0,0,0,0.1);
    z-index: 100;
}

.nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-decoration: none;
    color: var(--text-secondary);
    padding: 0.5rem;
    border-radius: var(--border-radius);
    transition: var(--transition);
    min-width: 60px;
}

.nav-item:hover {
    background: var(--background-light);
}

.nav-item.active {
    color: var(--primary-blue);
    background: rgba(33, 150, 243, 0.1);
}

.nav-item i {
    font-size: 1.2rem;
    margin-bottom: 0.2rem;
}

.nav-item span {
    font-size: 0.7rem;
    font-weight: 500;
}

.footer {
    text-align: center;
    padding: 2rem 1rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
    background: var(--background-dark);
    border-top: 1px solid var(--border-color);
    margin-top: 2rem;
}

@media (max-width: 768px) {
    .header-content {
        text-align: center;
    }
    
    .header h1 {
        font-size: 1.3rem;
    }
    
    .conversion-card {
        padding: 1.5rem;
    }
    
    .history-header {
        flex-direction: column;
        align-items: stretch;
    }
    
    .history-controls {
        justify-content: center;
        flex-direction: column;
        gap: 1rem;
    }
    
    .history-buttons {
        justify-content: center;
    }
    
    .search-input {
        width: 100%;
        max-width: 300px;
    }
    
    .history-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }
    
    .history-date {
        text-align: left;
    }
    
    .travel-results {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .main-content {
        padding: 0.5rem;
    }
    
    .conversion-card {
        padding: 1rem;
    }
    
    .amount-input {
        font-size: 1.3rem;
        padding: 1rem;
    }
    
    .swap-button {
        width: 50px;
        height: 50px;
        font-size: 1rem;
    }
}

.loading {
    opacity: 0.6;
    pointer-events: none;
}

.error {
    border-color: var(--error-red) !important;
    background: rgba(244, 67, 54, 0.1) !important;
}

.success {
    border-color: var(--success-green) !important;
    background: rgba(76, 175, 80, 0.1) !important;
}

.pulse {
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

.update-notification {
    position: fixed;
    top: 20px;
    right: 20px;
    background: var(--primary-blue);
    color: white;
    padding: 1rem 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-hover);
    z-index: 1000;
    animation: slideIn 0.3s ease;
}

.notification-content {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.notification-content i {
    animation: spin 1s linear infinite;
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}