@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

:root {
    --transition-speed: 0.3s;
    --border-radius: 16px;
    --border-radius-lg: 24px;
    --shadow-elevation: 0 8px 32px;

    --bg-light: #f8fafc;
    --card-bg-light: rgba(255, 255, 255, 0.9);
    --text-primary-light: #0f172a;
    --text-secondary-light: #64748b;
    --accent-primary-light: #2563eb;
    --accent-secondary-light: #e0f2fe;
    --border-light: #e2e8f0;
    --shadow-light: var(--shadow-elevation) rgba(15, 23, 42, 0.08);

    --bg-dark: #0f172a;
    --card-bg-dark: rgba(30, 41, 59, 0.9);
    --text-primary-dark: #f8fafc;
    --text-secondary-dark: #94a3b8;
    --accent-primary-dark: #3b82f6;
    --accent-secondary-dark: #1e293b;
    --border-dark: #334155;
    --shadow-dark: var(--shadow-elevation) rgba(0, 0, 0, 0.3);
}

* {
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    margin: 0;
    padding: 0;
    min-height: 100vh;
    transition: all var(--transition-speed) ease;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body.light-theme {
    background-color: var(--bg-light);
    color: var(--text-primary-light);
}

body.dark-theme {
    background-color: var(--bg-dark);
    color: var(--text-primary-dark);
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.background-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    opacity: 0.6;
    background: 
        radial-gradient(circle at 20% 20%, rgba(37, 99, 235, 0.1), transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(59, 130, 246, 0.1), transparent 50%);
    transition: opacity var(--transition-speed);
}

body.dark-theme .background-overlay {
    opacity: 0.4;
    background: 
        radial-gradient(circle at 20% 20%, rgba(59, 130, 246, 0.15), transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(37, 99, 235, 0.15), transparent 50%);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

header {
    margin-bottom: 3rem;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 2rem;
}

.main-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    margin: 0;
    background: linear-gradient(135deg, var(--accent-primary-light), var(--accent-primary-dark));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.controls {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.lang-switcher {
    display: flex;
    background: var(--card-bg-light);
    border-radius: var(--border-radius);
    padding: 0.25rem;
    box-shadow: var(--shadow-light);
    border: 1px solid var(--border-light);
}

body.dark-theme .lang-switcher {
    background: var(--card-bg-dark);
    box-shadow: var(--shadow-dark);
    border-color: var(--border-dark);
}

.lang-btn {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 600;
    padding: 0.75rem 1rem;
    transition: all var(--transition-speed);
    border-radius: calc(var(--border-radius) - 0.25rem);
    color: var(--text-secondary-light);
}

body.dark-theme .lang-btn {
    color: var(--text-secondary-dark);
}

.lang-btn:hover:not(.active) {
    background: var(--accent-secondary-light);
}

body.dark-theme .lang-btn:hover:not(.active) {
    background: var(--accent-secondary-dark);
}

.lang-btn.active {
    background: var(--accent-primary-light);
    color: white;
    box-shadow: 0 2px 8px rgba(37, 99, 235, 0.3);
}

body.dark-theme .lang-btn.active {
    background: var(--accent-primary-dark);
}

.theme-switcher {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.theme-switcher .fas {
    font-size: 1.25rem;
    transition: color var(--transition-speed);
}

body.light-theme .theme-switcher .fa-sun {
    color: var(--accent-primary-light);
}

body.dark-theme .theme-switcher .fa-moon {
    color: var(--accent-primary-dark);
}

.switch {
    position: relative;
    display: inline-block;
    width: 52px;
    height: 28px;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    border-radius: 28px;
    transition: var(--transition-speed);
    background: var(--border-light);
}

body.dark-theme .slider {
    background: var(--border-dark);
}

.slider:before {
    position: absolute;
    content: "";
    height: 22px;
    width: 22px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    border-radius: 50%;
    transition: var(--transition-speed);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

input:checked + .slider {
    background: var(--accent-primary-dark);
}

input:checked + .slider:before {
    transform: translateX(24px);
}

.converter-section {
    margin-bottom: 4rem;
}

.converter-card {
    background: var(--card-bg-light);
    border-radius: var(--border-radius-lg);
    padding: 3rem;
    box-shadow: var(--shadow-light);
    border: 1px solid var(--border-light);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    transition: all var(--transition-speed);
}

body.dark-theme .converter-card {
    background: var(--card-bg-dark);
    box-shadow: var(--shadow-dark);
    border-color: var(--border-dark);
}

.converter-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin: 0 0 2rem 0;
    text-align: center;
    color: var(--text-primary-light);
}

body.dark-theme .converter-title {
    color: var(--text-primary-dark);
}

.form-group {
    display: flex;
    flex-direction: column;
    margin-bottom: 2rem;
}

.form-group label {
    margin-bottom: 0.75rem;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary-light);
}

body.dark-theme .form-group label {
    color: var(--text-secondary-dark);
}

input[type="number"] {
    width: 100%;
    padding: 1rem 1.25rem;
    border-radius: var(--border-radius);
    font-size: 1.75rem;
    font-weight: 600;
    border: 2px solid var(--border-light);
    transition: all var(--transition-speed);
    background: white;
    color: var(--text-primary-light);
}

body.dark-theme input[type="number"] {
    background: var(--bg-dark);
    border-color: var(--border-dark);
    color: var(--text-primary-dark);
}

input[type="number"]:focus {
    outline: none;
    border-color: var(--accent-primary-light);
    box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.1);
}

body.dark-theme input[type="number"]:focus {
    border-color: var(--accent-primary-dark);
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.1);
}

.currencies-group {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 2rem;
    align-items: flex-end;
    margin-bottom: 3rem;
}

.swap-icon-container {
    display: flex;
    justify-content: center;
    align-items: center;
    padding-bottom: 8px;
}

.swap-icon {
    cursor: pointer;
    font-size: 1.25rem;
    width: 52px;
    height: 52px;
    border-radius: 50%;
    border: none;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease-in-out;
    background: var(--accent-secondary-light);
    color: var(--accent-primary-light);
}

body.dark-theme .swap-icon {
    background: var(--accent-secondary-dark);
    color: var(--accent-primary-dark);
}

.swap-icon:hover {
    transform: rotate(180deg) scale(1.05);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

.swap-icon:active {
    transform: rotate(180deg) scale(0.95);
}

.result-area {
    text-align: center;
    background: var(--accent-secondary-light);
    border-radius: var(--border-radius);
    padding: 2rem;
    transition: background-color var(--transition-speed);
}

body.dark-theme .result-area {
    background: var(--accent-secondary-dark);
}

.rate-info {
    margin: 0 0 1rem 0;
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--text-secondary-light);
}

body.dark-theme .rate-info {
    color: var(--text-secondary-dark);
}

.result {
    margin: 0;
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 700;
    color: var(--accent-primary-light);
    word-break: break-all;
}

body.dark-theme .result {
    color: var(--accent-primary-dark);
}

.last-updated {
    font-size: 0.85rem;
    margin: 1.5rem 0 0 0;
    opacity: 0.8;
    color: var(--text-secondary-light);
}

body.dark-theme .last-updated {
    color: var(--text-secondary-dark);
}

.rates-section {
    margin-bottom: 4rem;
}

.section-title {
    font-size: 1.75rem;
    font-weight: 600;
    margin: 0 0 2rem 0;
    text-align: center;
    color: var(--text-primary-light);
}

body.dark-theme .section-title {
    color: var(--text-primary-dark);
}

.rates-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.rate-card {
    background: var(--card-bg-light);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--shadow-light);
    border: 1px solid var(--border-light);
    transition: all var(--transition-speed);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

body.dark-theme .rate-card {
    background: var(--card-bg-dark);
    box-shadow: var(--shadow-dark);
    border-color: var(--border-dark);
}

.rate-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 40px rgba(37, 99, 235, 0.15);
}

body.dark-theme .rate-card:hover {
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
}

.rate-card-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.currency-flag {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--accent-primary-light);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.9rem;
}

body.dark-theme .currency-flag {
    background: var(--accent-primary-dark);
}

.currency-info h3 {
    margin: 0;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary-light);
}

body.dark-theme .currency-info h3 {
    color: var(--text-primary-dark);
}

.currency-info p {
    margin: 0;
    font-size: 0.9rem;
    color: var(--text-secondary-light);
}

body.dark-theme .currency-info p {
    color: var(--text-secondary-dark);
}

.rate-value {
    text-align: right;
}

.rate-amount {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent-primary-light);
    margin: 0;
}

body.dark-theme .rate-amount {
    color: var(--accent-primary-dark);
}

.rate-change {
    font-size: 0.85rem;
    margin: 0.25rem 0 0 0;
    font-weight: 500;
}

.rate-change.positive {
    color: #10b981;
}

.rate-change.negative {
    color: #ef4444;
}

.ad-section {
    margin-bottom: 3rem;
}

.ad-container {
    background: var(--card-bg-light);
    border-radius: var(--border-radius);
    padding: 1rem;
    box-shadow: var(--shadow-light);
    border: 1px solid var(--border-light);
    min-height: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
}

body.dark-theme .ad-container {
    background: var(--card-bg-dark);
    box-shadow: var(--shadow-dark);
    border-color: var(--border-dark);
}

footer {
    border-top: 1px solid var(--border-light);
    padding: 3rem 0 2rem 0;
    text-align: center;
}

body.dark-theme footer {
    border-color: var(--border-dark);
}

.footer-content {
    max-width: 600px;
    margin: 0 auto;
}

.footer-description {
    font-size: 0.95rem;
    color: var(--text-secondary-light);
    margin-bottom: 2rem;
    line-height: 1.7;
}

body.dark-theme .footer-description {
    color: var(--text-secondary-dark);
}

.telegram-link {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    font-weight: 500;
    font-size: 1.05rem;
    color: var(--accent-primary-light);
    transition: all var(--transition-speed);
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius);
    background: var(--accent-secondary-light);
}

body.dark-theme .telegram-link {
    color: var(--accent-primary-dark);
    background: var(--accent-secondary-dark);
}

.telegram-link:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(37, 99, 235, 0.2);
}

.select2-container--default .select2-selection--single {
    height: 56px;
    border: 2px solid var(--border-light);
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    transition: all var(--transition-speed);
    background: white;
}

body.dark-theme .select2-container--default .select2-selection--single {
    border-color: var(--border-dark);
    background: var(--bg-dark);
}

.select2-container--default .select2-selection--single .select2-selection__rendered {
    font-size: 1.1rem;
    font-weight: 500;
    padding-left: 1.25rem;
    color: var(--text-primary-light);
}

body.dark-theme .select2-container--default .select2-selection--single .select2-selection__rendered {
    color: var(--text-primary-dark);
}

.select2-container--default .select2-selection--single .select2-selection__arrow {
    height: 54px;
    right: 1rem;
}

.select2-container--default.select2-container--open .select2-selection--single {
    border-color: var(--accent-primary-light);
    box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.1);
}

body.dark-theme .select2-container--default.select2-container--open .select2-selection--single {
    border-color: var(--accent-primary-dark);
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.1);
}

.select2-dropdown {
    border: 2px solid var(--border-light);
    border-radius: var(--border-radius);
    background: white;
    box-shadow: var(--shadow-light);
}

body.dark-theme .select2-dropdown {
    border-color: var(--border-dark);
    background: var(--bg-dark);
    box-shadow: var(--shadow-dark);
}

.select2-search--dropdown .select2-search__field {
    border: 1px solid var(--border-light);
    border-radius: calc(var(--border-radius) - 4px);
    padding: 0.75rem;
    background: white;
    color: var(--text-primary-light);
}

body.dark-theme .select2-search--dropdown .select2-search__field {
    border-color: var(--border-dark);
    background: var(--bg-dark);
    color: var(--text-primary-dark);
}

.select2-results__option {
    padding: 0.75rem 1.25rem;
    color: var(--text-primary-light);
}

body.dark-theme .select2-results__option {
    color: var(--text-primary-dark);
}

.select2-results__option--highlighted[aria-selected] {
    background-color: var(--accent-primary-light);
    color: white;
}

body.dark-theme .select2-results__option--highlighted[aria-selected] {
    background-color: var(--accent-primary-dark);
}

@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }
    
    .header-content {
        flex-direction: column;
        gap: 1.5rem;
        text-align: center;
    }
    
    .converter-card {
        padding: 2rem 1.5rem;
    }
    
    .currencies-group {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .swap-icon-container {
        order: 1;
        padding-bottom: 0;
        margin: 0.75rem 0;
        transform: rotate(90deg);
    }
    
    .from-group {
        order: 0;
    }
    
    .to-group {
        order: 2;
    }
    
    .swap-icon:hover {
        transform: rotate(270deg) scale(1.05);
    }
    
    .swap-icon:active {
        transform: rotate(270deg) scale(0.95);
    }
    
    .rates-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .main-title {
        font-size: 1.75rem;
    }
    
    .controls {
        flex-direction: column;
        gap: 1rem;
    }
    
    input[type="number"] {
        font-size: 1.5rem;
        padding: 0.875rem 1rem;
    }
    
    .result {
        font-size: 2.25rem;
    }
}

@media (min-width: 769px) {
    .main-grid {
        display: grid;
        grid-template-columns: 2fr 1fr;
        gap: 3rem;
        align-items: start;
    }
}

@media (min-width: 1024px) {
    .rates-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (min-width: 1200px) {
    .rates-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}