/* Modern CSS with Fluent Design */
:root {
    /* Light Theme Colors */
    --primary-color: #0078d4;
    --primary-hover: #106ebe;
    --secondary-color: #6264a7;
    --accent-color: #ff6b35;
    --success-color: #107c10;
    --warning-color: #ffb900;
    --error-color: #d13438;
    
    /* Background Colors */
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #f3f2f1;
    --bg-glass: rgba(255, 255, 255, 0.7);
    --bg-card: rgba(255, 255, 255, 0.8);
    
    /* Text Colors */
    --text-primary: #323130;
    --text-secondary: #605e5c;
    --text-tertiary: #8a8886;
    --text-inverse: #ffffff;
    
    /* Border & Shadow */
    --border-color: rgba(0, 0, 0, 0.1);
    --shadow-light: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-medium: 0 4px 16px rgba(0, 0, 0, 0.15);
    --shadow-heavy: 0 8px 32px rgba(0, 0, 0, 0.2);
    
    /* Fluent Design */
    --blur-effect: blur(20px);
    --border-radius: 8px;
    --border-radius-large: 12px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'Courier New', 'Monaco', 'Menlo', 'Consolas', monospace;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
}

/* Dark Theme */
[data-theme="dark"] {
    --bg-primary: #1e1e1e;
    --bg-secondary: #2d2d30;
    --bg-tertiary: #3e3e42;
    --bg-glass: rgba(30, 30, 30, 0.7);
    --bg-card: rgba(45, 45, 48, 0.8);
    
    --text-primary: #ffffff;
    --text-secondary: #cccccc;
    --text-tertiary: #999999;
    
    --border-color: rgba(255, 255, 255, 0.1);
    --shadow-light: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-medium: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-heavy: 0 8px 32px rgba(0, 0, 0, 0.5);
}

/* Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--text-primary);
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
    min-height: 100vh;
    transition: var(--transition);
}

/* App Container */
.app-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--bg-glass);
    backdrop-filter: var(--blur-effect);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--primary-color);
}

.logo i {
    font-size: 1.5rem;
}

.nav {
    display: flex;
    gap: 2rem;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    transition: var(--transition);
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-color);
    background: rgba(0, 120, 212, 0.1);
}

.theme-btn {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    width: 2.5rem;
    height: 2.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-primary);
    cursor: pointer;
    transition: var(--transition);
    backdrop-filter: var(--blur-effect);
}

.theme-btn:hover {
    background: var(--primary-color);
    color: var(--text-inverse);
    transform: scale(1.05);
}

/* Main Content */
.main-content {
    flex: 1;
    padding: 2rem 0;
}

/* Hero Section */
.hero-section {
    text-align: center;
    padding: 3rem 2rem;
    max-width: 800px;
    margin: 0 auto;
}

.hero-title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

/* Calculator Section */
.calculator-section {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.calculator-container {
    background: var(--bg-card);
    backdrop-filter: var(--blur-effect);
    border-radius: var(--border-radius-large);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-medium);
    padding: 2rem;
    margin-bottom: 3rem;
}

/* Quick Convert Section */
.quick-convert-section {
    background: var(--bg-card);
    backdrop-filter: var(--blur-effect);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-large);
    box-shadow: var(--shadow-light);
    padding: 1.5rem;
    margin-bottom: 2rem;
}

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

.section-header h3 {
    margin: 0;
    color: var(--text-primary);
    font-size: var(--font-size-lg);
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.section-header h3 i {
    color: var(--primary-color);
}

.clear-btn {
    background: var(--bg-secondary);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.clear-btn:hover {
    background: var(--hover-color);
    color: var(--text-primary);
    transform: translateY(-1px);
}

.convert-input-group {
    display: flex;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.convert-input {
    flex: 1;
    padding: 0.875rem 1.25rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: var(--font-size-base);
    transition: var(--transition);
}

.convert-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px var(--primary-color-alpha);
}

.convert-btn {
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    padding: 0.875rem 1.5rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    white-space: nowrap;
    box-shadow: var(--shadow-light);
}

.convert-btn:hover {
    background: #005a9e;
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

.convert-result {
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    padding: 1.25rem;
    font-family: var(--font-mono);
    font-size: var(--font-size-base);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    min-height: 3rem;
    display: flex;
    align-items: center;
    margin-bottom: 1rem;
    word-wrap: break-word;
    overflow-wrap: break-word;
    line-height: 1.4;
}

.convert-result:empty:before {
    content: "Enter an amount like '4.78 ref' or '2.5 keys' to see the breakdown";
    color: var(--text-tertiary);
    font-style: italic;
}

.breakdown-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
    margin-top: 1rem;
}

.breakdown-grid .breakdown-item {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 0.75rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.breakdown-grid .breakdown-label {
    font-weight: 500;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.breakdown-grid .breakdown-value {
    font-weight: 600;
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 0.875rem;
}

.calculator-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.calculator-header h2 {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    color: var(--text-primary);
}

.refresh-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--primary-color);
    color: var(--text-inverse);
    border: none;
    border-radius: var(--border-radius);
    padding: 0.75rem 1.5rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.refresh-btn:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-light);
}

.refresh-btn i {
    transition: transform 0.3s ease;
}

.refresh-btn:hover i {
    transform: rotate(180deg);
}

/* Converter Grid */
.converter-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-bottom: 2rem;
}

.currency-group {
    background: var(--bg-secondary);
    border-radius: var(--border-radius-large);
    padding: 1.5rem;
    border: 1px solid var(--border-color);
}

.group-title {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.group-title i {
    color: var(--primary-color);
}

/* Currency Cards */
.currency-card {
    display: flex;
    align-items: center;
    gap: 1rem;
    background: var(--bg-card);
    border-radius: var(--border-radius);
    padding: 1rem;
    margin-bottom: 1rem;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.currency-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-light);
    border-color: var(--primary-color);
}

.currency-card.premium {
    background: linear-gradient(135deg, rgba(255, 107, 53, 0.1), rgba(98, 100, 167, 0.1));
    border-color: var(--accent-color);
}

.currency-icon {
    width: 3rem;
    height: 3rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
}

.currency-icon img {
    width: 2rem;
    height: 2rem;
    object-fit: contain;
}

.currency-flag {
    font-size: 1.5rem;
    width: 2.5rem;
    height: 2.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.currency-info {
    flex: 1;
}

.currency-info label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

.currency-input {
    width: 100%;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 0.75rem;
    font-size: var(--font-size-base);
    font-weight: 500;
    color: var(--text-primary);
    transition: var(--transition);
}

.currency-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 120, 212, 0.1);
}

.currency-input::placeholder {
    color: var(--text-tertiary);
}

/* Real Currency Grid */
.currency-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

.currency-card.compact {
    flex-direction: row;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem;
}

.currency-card.compact .currency-info label {
    font-size: var(--font-size-xs);
    margin-bottom: 0.125rem;
}

.currency-card.compact .currency-input {
    padding: 0.5rem;
    font-size: var(--font-size-sm);
}

/* Quick Actions */
.quick-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.action-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 0.75rem 1.5rem;
    font-weight: 500;
    color: var(--text-primary);
    cursor: pointer;
    transition: var(--transition);
}

.action-btn:hover {
    background: var(--bg-tertiary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-light);
}

.clear-btn:hover {
    background: var(--error-color);
    color: var(--text-inverse);
    border-color: var(--error-color);
}

.copy-btn:hover {
    background: var(--success-color);
    color: var(--text-inverse);
    border-color: var(--success-color);
}

/* Rates Section */
.rates-section {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.rates-container h2 {
    text-align: center;
    font-size: var(--font-size-2xl);
    font-weight: 600;
    margin-bottom: 2rem;
    color: var(--text-primary);
}

.rates-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

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

.rate-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-medium);
}

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

.rate-header h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-primary);
}

.last-updated {
    font-size: var(--font-size-xs);
    color: var(--text-tertiary);
}

.rate-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.rate-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem;
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    font-weight: 500;
}

.rate-item span:nth-child(2) {
    color: var(--primary-color);
    font-weight: 600;
}

/* Store Prices Styles */
.store-card {
    background: linear-gradient(135deg, rgba(255, 107, 53, 0.1), rgba(0, 120, 212, 0.1));
    border-color: var(--accent-color);
}

.store-item span:nth-child(2) {
    color: var(--accent-color);
    font-size: 1.2rem;
}

.store-link {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.store-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    background: var(--accent-color);
    color: var(--text-inverse);
    text-decoration: none;
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius);
    font-weight: 500;
    transition: var(--transition);
    width: 100%;
}

.store-btn:hover {
    background: #e55a2b;
    transform: translateY(-2px);
    box-shadow: var(--shadow-light);
}

.store-btn i {
    font-size: 0.875rem;
}

/* Trading Value Styles */
.trading-value-header {
    margin-bottom: 1rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border-color);
}

.currency-controls {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.trading-value-display {
    margin-bottom: 1.5rem;
}

.trading-total {
    background: linear-gradient(135deg, rgba(0, 120, 212, 0.1), rgba(98, 100, 167, 0.1));
    border: 2px solid var(--primary-color);
    padding: 1.25rem;
    max-width: 400px;
    margin: 0 auto;
}

.trading-total .currency-info label {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-bottom: 0.4rem;
}

.total-value {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--primary-color);
}

.exchange-disclaimer {
    color: var(--text-tertiary);
    font-style: italic;
    text-align: right;
    flex-shrink: 0;
}

.exchange-disclaimer small {
    font-size: 0.8rem;
}

/* Store Calculator Styles */
.store-calculator {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 2px solid var(--accent-color);
    background: linear-gradient(135deg, rgba(255, 107, 53, 0.05), rgba(0, 120, 212, 0.05));
    border-radius: var(--border-radius);
    padding: 1.25rem;
}

.store-calculator-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.75rem;
    gap: 1rem;
}

.store-calculator-title {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--accent-color);
    margin: 0;
}

.currency-selector {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.currency-selector label {
    font-weight: 500;
    color: var(--text-secondary);
    white-space: nowrap;
    font-size: 0.9rem;
}

.currency-dropdown {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 0.5rem 0.75rem;
    font-size: 0.9rem;
    color: var(--text-primary);
    cursor: pointer;
    transition: var(--transition);
    min-width: 140px;
    max-width: 180px;
}

.currency-dropdown:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 120, 212, 0.1);
}

.store-price-display {
    margin: 1rem 0;
}

.price-card {
    display: flex;
    align-items: center;
    gap: 1rem;
    background: var(--bg-card);
    border: 2px solid var(--accent-color);
    border-radius: var(--border-radius-large);
    padding: 1.5rem;
    transition: var(--transition);
}

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

.price-flag {
    font-size: 2rem;
    width: 3rem;
    height: 3rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-primary);
    border-radius: 50%;
    border: 2px solid var(--border-color);
}

.price-content {
    flex: 1;
    text-align: center;
}

.price-label {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    font-weight: 500;
    margin-bottom: 0.25rem;
}

.price-value {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--accent-color);
    line-height: 1;
    margin-bottom: 0.25rem;
}

.price-disclaimer {
    font-size: var(--font-size-xs);
    color: var(--text-tertiary);
    font-style: italic;
}

.currency-switch-btn {
    background: var(--accent-color);
    color: var(--text-inverse);
    border: none;
    border-radius: 50%;
    width: 2.5rem;
    height: 2.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
}

.currency-switch-btn:hover {
    background: #e55a2b;
    transform: scale(1.1);
}

.currency-switch-btn i {
    transition: transform 0.3s ease;
}

.currency-switch-btn:hover i {
    transform: rotate(180deg);
}

.price-breakdown {
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    padding: 1rem;
    border: 1px solid var(--border-color);
}

.price-breakdown h4 {
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5rem;
}

.breakdown-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border-color);
}

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

.breakdown-label {
    font-weight: 500;
    color: var(--text-secondary);
}

.breakdown-value {
    font-weight: 600;
    color: var(--text-primary);
    font-family: 'Courier New', monospace;
    font-size: var(--font-size-sm);
}

.mannco-disclaimer {
    background: var(--bg-tertiary);
    border-radius: var(--border-radius);
    padding: 1rem;
    border-left: 4px solid var(--accent-color);
    margin-top: 1rem;
}

.mannco-disclaimer p {
    margin: 0;
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    line-height: 1.5;
}

.mannco-disclaimer strong {
    color: var(--text-primary);
}

/* Footer */
.footer {
    background: var(--bg-tertiary);
    border-top: 1px solid var(--border-color);
    margin-top: auto;
    padding: 2rem 0 1rem;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 1rem;
}

.footer-section h4 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.footer-section p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.footer-section a {
    display: block;
    color: var(--text-secondary);
    text-decoration: none;
    margin-bottom: 0.5rem;
    transition: var(--transition);
}

.footer-section a:hover {
    color: var(--primary-color);
}

.social-link {
    display: flex !important;
    align-items: center;
    gap: 0.5rem;
}

.footer-bottom {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem 0;
    border-top: 1px solid var(--border-color);
    text-align: center;
    color: var(--text-tertiary);
    font-size: var(--font-size-sm);
}

/* About Sidebar */
.about-sidebar {
    position: fixed;
    top: 0;
    right: 0;
    width: 100%;
    max-width: 500px;
    height: 100vh;
    z-index: 1000;
    transform: translateX(100%);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.about-sidebar.active {
    transform: translateX(0);
}

.sidebar-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
    cursor: pointer;
    z-index: 999;
}

.about-sidebar.active .sidebar-overlay {
    opacity: 1;
    visibility: visible;
}

.sidebar-content {
    position: relative;
    width: 100%;
    height: 100%;
    background: var(--bg-card);
    backdrop-filter: var(--blur-effect);
    border-left: 1px solid var(--border-color);
    box-shadow: var(--shadow-heavy);
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    z-index: 1001;
}

.sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.5rem 2rem;
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-primary);
    position: sticky;
    top: 0;
    z-index: 10;
}

.sidebar-header h2 {
    margin: 0;
    color: var(--text-primary);
    font-size: var(--font-size-xl);
    font-weight: 600;
}

.sidebar-close {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1.25rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: var(--border-radius);
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2.5rem;
    height: 2.5rem;
}

.sidebar-close:hover {
    background: var(--hover-color);
    color: var(--text-primary);
}

.sidebar-body {
    padding: 2rem;
    flex: 1;
}

.about-section {
    margin-bottom: 2rem;
}

.about-section h3 {
    color: var(--primary-color);
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.about-section p {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 1rem;
}

.thanks-list,
.feature-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.thanks-list li,
.feature-list li {
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-secondary);
    line-height: 1.5;
}

.thanks-list li:last-child,
.feature-list li:last-child {
    border-bottom: none;
}

.thanks-list li strong {
    color: var(--primary-color);
}

.feature-list li {
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 1rem;
        padding: 0 1rem;
    }

    .nav {
        gap: 1rem;
    }

    .hero-section {
        padding: 2rem 1rem;
    }

    .hero-title {
        font-size: var(--font-size-2xl);
    }

    .calculator-section,
    .rates-section {
        padding: 0 1rem;
    }

    .calculator-container {
        padding: 1.5rem;
    }

    .converter-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .calculator-header {
        flex-direction: column;
        gap: 1rem;
        align-items: stretch;
    }

    .quick-actions {
        flex-direction: column;
    }

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

    .rates-grid {
        grid-template-columns: 1fr;
    }
    
    /* Mobile currency controls */
    .currency-controls {
        flex-direction: column;
        align-items: stretch;
        gap: 1rem;
    }
    
    .currency-selector {
        justify-content: space-between;
    }
    
    .currency-dropdown {
        min-width: auto;
        max-width: none;
        flex: 1;
    }
    
    .exchange-disclaimer {
        text-align: center;
    }
    
    /* Mobile Quick Convert */
    .convert-input-group {
        flex-direction: column;
        gap: 1rem;
    }
    
    .convert-btn {
        width: 100%;
        justify-content: center;
        padding: 1rem 1.5rem;
    }
    
    .convert-result {
        font-size: var(--font-size-sm);
        padding: 1rem;
        line-height: 1.5;
        white-space: nowrap;
        overflow-x: auto;
        justify-content: flex-start;
    }
    
    .breakdown-grid {
        grid-template-columns: 1fr;
    }

    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
        padding: 0 1rem;
    }
    
    /* Mobile About Sidebar */
    .about-sidebar {
        max-width: 100%;
    }
    
    .sidebar-header {
        padding: 1rem 1.5rem;
    }
    
    .sidebar-body {
        padding: 1.5rem;
    }
}

@media (max-width: 480px) {
    .currency-card {
        flex-direction: column;
        text-align: center;
        gap: 0.75rem;
    }

    .currency-card.compact {
        flex-direction: column;
    }

    .store-calculator-header {
        flex-direction: column;
        align-items: stretch;
        gap: 1rem;
    }

    .currency-selector {
        flex-direction: column;
        align-items: stretch;
        gap: 0.5rem;
    }

    .currency-selector label {
        min-width: auto;
    }

    .price-card {
        flex-direction: column;
        text-align: center;
        gap: 1rem;
    }

    .price-flag {
        align-self: center;
    }

    .breakdown-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.25rem;
    }
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

.calculator-container {
    animation: fadeInUp 0.6s ease;
}

.currency-card {
    animation: fadeInUp 0.6s ease;
}

.rate-card {
    animation: fadeInUp 0.6s ease;
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* High contrast mode */
@media (prefers-contrast: high) {
    :root {
        --border-color: #000000;
        --shadow-light: 0 2px 8px rgba(0, 0, 0, 0.5);
        --shadow-medium: 0 4px 16px rgba(0, 0, 0, 0.6);
    }
}