:root {
    --primary-color: #4361ee;
    --secondary-color: #3f37c9;
    --accent-color: #4cc9f0;
    --success-color: #4CAF50;
    --danger-color: #f72585;
    --warning-color: #ff9800;
    --light-color: #f8f9fa;
    --dark-color: #212529;
    --gray-color: #6c757d;
    --light-gray: #e9ecef;
    --border-radius: 12px;
    --box-shadow: 0 6px 15px rgba(0, 0, 0, 0.08);
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Roboto', sans-serif;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    min-height: 100vh;
    color: var(--dark-color);
    line-height: 1.6;
}

.app-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Шапка приложения */
.app-header {
    background-color: white;
    border-radius: var(--border-radius);
    padding: 20px 30px;
    margin-bottom: 25px;
    box-shadow: var(--box-shadow);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
}

.app-header h1 {
    color: var(--primary-color);
    font-weight: 700;
    font-size: 1.8rem;
    display: flex;
    align-items: center;
    gap: 12px;
}

.base-currency-selector {
    display: flex;
    align-items: center;
    gap: 15px;
    flex-wrap: wrap;
}

.base-currency-selector label {
    font-weight: 500;
    color: var(--gray-color);
}

.base-currency-selector select {
    padding: 10px 15px;
    border-radius: 8px;
    border: 2px solid var(--light-gray);
    background-color: white;
    font-weight: 500;
    color: var(--dark-color);
    cursor: pointer;
    transition: var(--transition);
    min-width: 200px;
}

.base-currency-selector select:focus {
    outline: none;
    border-color: var(--primary-color);
}

.refresh-btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    font-size: 1.1rem;
}

.refresh-btn:hover {
    background-color: var(--secondary-color);
    transform: rotate(90deg);
}

/* Навигация */
.main-nav {
    display: flex;
    gap: 10px;
    margin-bottom: 25px;
    background-color: white;
    border-radius: var(--border-radius);
    padding: 10px;
    box-shadow: var(--box-shadow);
}

.nav-btn {
    flex: 1;
    padding: 15px 20px;
    border: none;
    background-color: transparent;
    border-radius: 8px;
    font-weight: 500;
    font-size: 1rem;
    color: var(--gray-color);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.nav-btn:hover {
    color: var(--primary-color);
    background-color: var(--light-gray);
}

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

/* Основной контент */
.main-content {
    flex: 1;
}

.page {
    display: none;
    animation: fadeIn 0.5s ease;
}

.page.active {
    display: block;
}

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

.page-description {
    color: var(--gray-color);
    margin-bottom: 25px;
    font-size: 1rem;
}

/* Контейнер конвертера */
.converter-container, .rates-container {
    background-color: white;
    border-radius: var(--border-radius);
    padding: 30px;
    box-shadow: var(--box-shadow);
    margin-bottom: 25px;
}

.converter-container h2, .rates-container h2 {
    color: var(--primary-color);
    margin-bottom: 15px;
    font-weight: 700;
    font-size: 1.6rem;
    display: flex;
    align-items: center;
    gap: 12px;
}

/* Поле ввода конвертера */
.input-container {
    margin-bottom: 30px;
}

.input-group {
    display: flex;
    gap: 15px;
    margin-bottom: 15px;
}

#converter-input {
    flex: 1;
    padding: 18px 20px;
    border-radius: var(--border-radius);
    border: 2px solid var(--light-gray);
    font-size: 1.1rem;
    transition: var(--transition);
}

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

.action-btn {
    padding: 18px 30px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 10px;
}

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

.input-hints {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    align-items: center;
}

.hint {
    color: var(--gray-color);
    font-size: 0.9rem;
}

.hint-example {
    background-color: var(--light-gray);
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 0.9rem;
    color: var(--dark-color);
    cursor: pointer;
    transition: var(--transition);
}

.hint-example:hover {
    background-color: #d8dde6;
}

/* Результат конвертации */
.result-container {
    margin: 30px 0;
    min-height: 140px;
}

.result-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--gray-color);
    padding: 40px 20px;
    border: 2px dashed var(--light-gray);
    border-radius: var(--border-radius);
    text-align: center;
}

.result-placeholder i {
    font-size: 2.5rem;
    margin-bottom: 15px;
    color: #bdc3d4;
}

.result {
    padding: 30px;
    background: linear-gradient(135deg, #f0f4ff 0%, #e3e9ff 100%);
    border-radius: var(--border-radius);
    border-left: 6px solid var(--primary-color);
    font-size: 1.3rem;
    display: none;
    animation: slideIn 0.5s ease;
}

@keyframes slideIn {
    from { transform: translateY(20px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

.result.show {
    display: block;
}

.conversion-amount {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 5px;
}

.conversion-details {
    color: var(--gray-color);
    font-size: 1.1rem;
}

.conversion-rate {
    margin-top: 15px;
    padding-top: 15px;
    border-top: 1px solid rgba(0, 0, 0, 0.1);
    font-size: 1rem;
    color: var(--dark-color);
}

/* Быстрый конвертер */
.quick-converters {
    margin-top: 40px;
    padding-top: 30px;
    border-top: 1px solid var(--light-gray);
}

.quick-converters h3 {
    color: var(--dark-color);
    margin-bottom: 20px;
    font-size: 1.3rem;
}

.quick-converter-grid {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 20px;
    align-items: center;
}

.quick-converter {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

#quick-amount {
    padding: 12px 15px;
    border-radius: 8px;
    border: 2px solid var(--light-gray);
    font-size: 1.1rem;
    width: 120px;
}

#quick-amount:focus {
    outline: none;
    border-color: var(--primary-color);
}

#quick-from, #quick-to {
    padding: 12px 15px;
    border-radius: 8px;
    border: 2px solid var(--light-gray);
    background-color: white;
    font-weight: 500;
    cursor: pointer;
    min-width: 100px;
}

.quick-arrow {
    font-size: 1.5rem;
    color: var(--primary-color);
    font-weight: 700;
}

.quick-action-btn {
    background-color: var(--accent-color);
    color: white;
    border: none;
    border-radius: 8px;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    font-size: 1.1rem;
}

.quick-action-btn:hover {
    background-color: #2db6de;
    transform: scale(1.05);
}

.quick-result {
    padding: 15px 20px;
    background-color: var(--light-gray);
    border-radius: var(--border-radius);
    font-weight: 600;
    font-size: 1.2rem;
    text-align: center;
    min-height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Страница с курсами валют */
.last-updated {
    color: var(--gray-color);
    font-size: 0.9rem;
    margin-left: 15px;
}

.rates-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 40px;
}

.rate-card {
    background-color: white;
    border-radius: var(--border-radius);
    padding: 20px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    border: 1px solid var(--light-gray);
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 15px;
}

.rate-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
    border-color: var(--accent-color);
}

.currency-flag {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    color: white;
}

.currency-info {
    flex: 1;
}

.currency-code {
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--dark-color);
    margin-bottom: 5px;
}

.currency-name {
    color: var(--gray-color);
    font-size: 0.9rem;
    margin-bottom: 5px;
}

.currency-rate {
    font-weight: 700;
    font-size: 1.3rem;
    color: var(--primary-color);
}

.rate-change {
    font-size: 0.9rem;
    font-weight: 500;
    padding: 3px 8px;
    border-radius: 12px;
}

.rate-change.positive {
    background-color: rgba(76, 175, 80, 0.15);
    color: var(--success-color);
}

.rate-change.negative {
    background-color: rgba(247, 37, 133, 0.15);
    color: var(--danger-color);
}

.popular-currencies {
    margin-top: 40px;
}

.popular-currencies h3 {
    color: var(--dark-color);
    margin-bottom: 20px;
    font-size: 1.3rem;
}

.popular-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 15px;
}

.popular-currency {
    background-color: var(--light-gray);
    border-radius: var(--border-radius);
    padding: 15px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: var(--transition);
}

.popular-currency:hover {
    background-color: #d8dde6;
}

.popular-code {
    font-weight: 700;
    color: var(--dark-color);
}

.popular-rate {
    font-weight: 600;
    color: var(--primary-color);
}

/* Футер */
.app-footer {
    text-align: center;
    padding: 20px;
    color: var(--gray-color);
    font-size: 0.9rem;
    margin-top: 30px;
}

.app-footer a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
}

.app-footer a:hover {
    text-decoration: underline;
}

.cache-info {
    font-size: 0.8rem;
    margin-top: 5px;
    color: #a0a7b8;
}

/* Уведомления */
.notification {
    position: fixed;
    bottom: 30px;
    right: 30px;
    padding: 15px 25px;
    border-radius: var(--border-radius);
    color: white;
    font-weight: 500;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
    z-index: 1000;
    display: none;
    animation: slideInRight 0.3s ease;
}

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

.notification.show {
    display: block;
}

.notification.success {
    background-color: var(--success-color);
}

.notification.error {
    background-color: var(--danger-color);
}

.notification.info {
    background-color: var(--primary-color);
}

/* Адаптивность */
@media (max-width: 768px) {
    .app-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 20px;
    }
    
    .base-currency-selector {
        width: 100%;
    }
    
    .input-group {
        flex-direction: column;
    }
    
    .quick-converter-grid {
        grid-template-columns: 1fr;
    }
    
    .rates-grid {
        grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    }
    
    .popular-grid {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    }
}

@media (max-width: 480px) {
    .app-container {
        padding: 15px;
    }
    
    .converter-container, .rates-container {
        padding: 20px;
    }
    
    .rates-grid {
        grid-template-columns: 1fr;
    }
    
    .main-nav {
        flex-direction: column;
    }
}

/* Индикатор статуса */
.status-indicator {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
}

.status-indicator.online {
    background-color: rgba(76, 175, 80, 0.15);
    color: #2e7d32;
}

.status-indicator.offline {
    background-color: rgba(244, 67, 54, 0.15);
    color: #c62828;
}

.update-counter {
    background-color: rgba(0, 0, 0, 0.1);
    border-radius: 50%;
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.7rem;
}

/* Анимация обновления */
.rate-card.updating {
    animation: pulse-border 1s infinite;
    border-color: var(--accent-color);
}

@keyframes pulse-border {
    0% { border-color: var(--accent-color); }
    50% { border-color: #b3e0ff; }
    100% { border-color: var(--accent-color); }
}

/* Сообщение об отсутствии данных */
.no-data {
    grid-column: 1 / -1;
    text-align: center;
    padding: 40px 20px;
    color: var(--gray-color);
}

.no-data i {
    font-size: 3rem;
    margin-bottom: 20px;
    color: #ff9800;
}

.retry-btn {
    margin-top: 15px;
    padding: 10px 20px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
}

.retry-btn:hover {
    background-color: var(--secondary-color);
}

/* Карточка популярной валюты */
.rate-card.popular {
    border-left: 4px solid var(--primary-color);
}

/* Контейнер для отладки (можно скрыть) */
.debug-info {
    position: fixed;
    bottom: 10px;
    right: 10px;
    background: rgba(0,0,0,0.8);
    color: white;
    padding: 10px;
    border-radius: 5px;
    font-size: 0.8rem;
    z-index: 1000;
    max-width: 300px;
}

/* Информация об источнике данных */
.data-source {
    margin-top: 15px;
    padding: 8px 12px;
    border-radius: 6px;
    font-size: 0.85rem;
    display: flex;
    align-items: center;
    gap: 8px;
}

.data-source.warning {
    background-color: rgba(255, 152, 0, 0.15);
    color: #f57c00;
    border-left: 3px solid #ff9800;
}

.data-source.info {
    background-color: rgba(33, 150, 243, 0.15);
    color: #1976d2;
    border-left: 3px solid #2196f3;
}

/* Сообщение об ограниченных данных */
.limited-data-warning {
    grid-column: 1 / -1;
    background-color: rgba(255, 193, 7, 0.15);
    border: 1px solid #ffc107;
    border-radius: var(--border-radius);
    padding: 15px;
    margin-top: 20px;
    display: flex;
    align-items: flex-start;
    gap: 12px;
}

.limited-data-warning i {
    color: #ff9800;
    font-size: 1.2rem;
    margin-top: 2px;
}

.limited-data-warning p {
    margin: 0;
    color: #f57c00;
    font-size: 0.9rem;
}

/* Оффлайн данные в заголовке */
.last-updated.offline-data {
    color: #ff9800;
}

/* Кнопки действий в сообщении об ошибке */
.action-buttons {
    display: flex;
    gap: 10px;
    margin-top: 15px;
    flex-wrap: wrap;
}

.offline-btn {
    padding: 10px 20px;
    background-color: #ff9800;
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
}

.offline-btn:hover {
    background-color: #f57c00;
}

/* Статистика API (для отладки) */
.api-stats {
    position: fixed;
    bottom: 10px;
    right: 10px;
    background: rgba(0, 0, 0, 0.9);
    color: white;
    padding: 15px;
    border-radius: 8px;
    font-size: 0.8rem;
    max-width: 300px;
    z-index: 1000;
    display: none;
}

.api-stats.show {
    display: block;
}

.api-stats h4 {
    margin-top: 0;
    color: #4cc9f0;
}

.api-stats-item {
    margin: 5px 0;
    display: flex;
    justify-content: space-between;
}

.api-stats-item.good {
    color: #4CAF50;
}

.api-stats-item.warning {
    color: #ff9800;
}

.api-stats-item.error {
    color: #f44336;
}

/* Индикатор статуса */
.status-indicator {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
    background-color: rgba(0, 0, 0, 0.05);
}

.status-indicator.online {
    border: 1px solid #4CAF50;
    color: #2e7d32;
}

.status-indicator.offline {
    border: 1px solid #f44336;
    color: #c62828;
}

.update-counter {
    background-color: rgba(0, 0, 0, 0.1);
    border-radius: 50%;
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.7rem;
}

/* Карточка с оффлайн данными */
.rate-card.fallback {
    opacity: 0.9;
    border-style: dashed;
}

.popular-currency.fallback {
    opacity: 0.8;
}

/* Информация об источнике данных */
.data-source {
    margin-top: 15px;
    padding: 8px 12px;
    border-radius: 6px;
    font-size: 0.85rem;
    display: flex;
    align-items: center;
    gap: 8px;
}

.data-source.warning {
    background-color: rgba(255, 152, 0, 0.15);
    color: #f57c00;
    border-left: 3px solid #ff9800;
}

.data-source.info {
    background-color: rgba(33, 150, 243, 0.15);
    color: #1976d2;
    border-left: 3px solid #2196f3;
}

/* Сообщение об отсутствии данных */
.no-data {
    grid-column: 1 / -1;
    text-align: center;
    padding: 40px 20px;
    color: var(--gray-color);
}

.no-data i {
    font-size: 3rem;
    margin-bottom: 20px;
    color: #607d8b;
}

.no-data h3 {
    margin-bottom: 15px;
    color: var(--dark-color);
}

.no-data ul {
    text-align: left;
    max-width: 400px;
    margin: 15px auto;
    padding-left: 20px;
}

.no-data li {
    margin-bottom: 8px;
}

/* Кнопки действий */
.action-buttons {
    display: flex;
    gap: 10px;
    margin-top: 20px;
    justify-content: center;
    flex-wrap: wrap;
}

.retry-btn, .offline-btn {
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 500;
}

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

.retry-btn:hover {
    background-color: var(--secondary-color);
}

.offline-btn {
    background-color: #ff9800;
    color: white;
}

.offline-btn:hover {
    background-color: #f57c00;
}

/* Статистика API */
.api-stats {
    position: fixed;
    bottom: 80px;
    left: 20px;
    background: rgba(0, 0, 0, 0.95);
    color: white;
    padding: 0;
    border-radius: 12px;
    font-size: 0.85rem;
    max-width: 350px;
    z-index: 1001;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.3);
    transform: translateY(20px);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.api-stats.show {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
}

.api-stats-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.api-stats-header h4 {
    margin: 0;
    color: #4cc9f0;
}

.close-stats {
    background: none;
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.api-stats-content {
    padding: 20px;
}

.stats-section {
    margin-bottom: 20px;
}

.stats-section h5 {
    margin-top: 0;
    margin-bottom: 10px;
    color: #e0e0e0;
}

.api-stats-item {
    margin: 8px 0;
    display: flex;
    justify-content: space-between;
}

.api-stats-item.good {
    color: #4CAF50;
}

.api-stats-item.warning {
    color: #ff9800;
}

.api-stats-item.error {
    color: #f44336;
}

.refresh-api-btn, .clear-cache-btn {
    width: 100%;
    padding: 10px;
    margin: 5px 0;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-weight: 500;
}

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

.refresh-api-btn:hover {
    background-color: var(--secondary-color);
}

.clear-cache-btn {
    background-color: #f44336;
    color: white;
}

.clear-cache-btn:hover {
    background-color: #d32f2f;
}

/* Бейдж оффлайн */
.offline-badge {
    background-color: #ff9800;
    color: white;
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.7rem;
    margin-left: 5px;
}

/* Оффлайн данные в заголовке */
.last-updated.offline-data {
    color: #ff9800;
    font-style: italic;
}

/* Сообщение об ограниченных данных */
.limited-data-warning {
    grid-column: 1 / -1;
    background-color: rgba(255, 193, 7, 0.15);
    border: 1px solid #ffc107;
    border-radius: var(--border-radius);
    padding: 15px;
    margin-top: 20px;
    display: flex;
    align-items: flex-start;
    gap: 12px;
}

.limited-data-warning i {
    color: #ff9800;
    font-size: 1.2rem;
    margin-top: 2px;
}

.limited-data-warning p {
    margin: 0;
    color: #f57c00;
    font-size: 0.9rem;
}

/* Нет данных в блоке популярных */
.no-data-small {
    text-align: center;
    padding: 20px;
    color: var(--gray-color);
    font-style: italic;
}