/**
 * Styles for CurrencyConverter.vip
 * Modern, responsive design with excellent UX
 */

/* ========================================
   CSS Variables
   ======================================== */
:root {
    /* Colors */
    --primary-color: #10b981;
    --primary-dark: #059669;
    --primary-light: #34d399;
    --secondary-color: #3b82f6;
    --secondary-dark: #2563eb;
    
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --text-light: #9ca3af;
    
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-tertiary: #f3f4f6;
    
    --border-color: #e5e7eb;
    --border-dark: #d1d5db;
    
    --success-color: #10b981;
    --error-color: #ef4444;
    --warning-color: #f59e0b;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #10b981 0%, #3b82f6 100%);
    --gradient-secondary: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    /* Typography */
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    color: var(--text-primary);
    background-color: var(--bg-secondary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ========================================
   Typography
   ======================================== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

p {
    margin-bottom: var(--spacing-md);
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: var(--primary-dark);
}

/* ========================================
   Layout
   ======================================== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* ========================================
   Header
   ======================================== */
.header {
    background: var(--gradient-primary);
    color: white;
    padding: var(--spacing-xl) 0;
    box-shadow: var(--shadow-md);
}

.header-content {
    text-align: center;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
}

.logo-icon {
    font-size: 2.5rem;
}

.logo-text {
    font-size: 2rem;
    font-weight: 700;
}

.tagline {
    font-size: 1.125rem;
    opacity: 0.95;
    margin: 0;
}

/* ========================================
   Main Content
   ======================================== */
.main-content {
    padding: var(--spacing-2xl) 0;
}

.content-grid {
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: var(--spacing-xl);
}

/* ========================================
   Converter Section
   ======================================== */
.converter-section {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

.converter-card {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-lg);
}

.section-title {
    text-align: center;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xl);
    font-size: 1.75rem;
}

/* Loading State */
.loading-state {
    text-align: center;
    padding: var(--spacing-2xl) 0;
}

.spinner {
    width: 50px;
    height: 50px;
    margin: 0 auto var(--spacing-lg);
    border: 4px solid var(--bg-tertiary);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* Error State */
.error-state {
    text-align: center;
    padding: var(--spacing-xl) 0;
}

.error-message {
    color: var(--error-color);
    font-size: 1.125rem;
    margin-bottom: var(--spacing-lg);
}

/* Converter Form */
.converter-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.input-label {
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.amount-input {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: 1.5rem;
    font-weight: 600;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: all 0.2s ease;
    font-family: var(--font-mono);
}

.amount-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.1);
}

/* Currency Selector */
.currency-selector-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.currency-selector {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: all 0.2s ease;
}

.currency-selector:focus-within {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.1);
}

.currency-flag {
    font-size: 2rem;
    line-height: 1;
}

.currency-select {
    flex: 1;
    padding: var(--spacing-sm);
    font-size: 1.125rem;
    font-weight: 600;
    border: none;
    background: transparent;
    cursor: pointer;
    color: var(--text-primary);
}

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

/* Swap Button */
.swap-container {
    display: flex;
    justify-content: center;
    margin: var(--spacing-sm) 0;
}

.swap-btn {
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.5rem;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-md);
}

.swap-btn:hover {
    transform: rotate(180deg) scale(1.1);
    box-shadow: var(--shadow-lg);
}

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

/* Result Card */
.result-card {
    background: var(--gradient-primary);
    color: white;
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow-xl);
}

.result-amount {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    font-family: var(--font-mono);
    word-break: break-all;
}

.result-currency {
    font-size: 2rem;
    opacity: 0.9;
    margin-left: var(--spacing-sm);
}

.exchange-rate {
    font-size: 1.125rem;
    opacity: 0.95;
    margin-bottom: var(--spacing-sm);
}

.last-updated {
    font-size: 0.875rem;
    opacity: 0.8;
}

/* Quick Actions */
.quick-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
}

/* Buttons */
.btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: var(--font-sans);
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: var(--shadow-md);
}

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

.btn-secondary {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 2px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--bg-tertiary);
    border-color: var(--border-dark);
}

.btn:active {
    transform: translateY(0);
}

/* Popular Conversions */
.popular-conversions {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
}

.subsection-title {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

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

.popular-item {
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    text-align: center;
    transition: all 0.2s ease;
    cursor: pointer;
}

.popular-item:hover {
    border-color: var(--primary-color);
    background: var(--bg-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.popular-pair {
    font-weight: 700;
    font-size: 1.125rem;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.popular-rate {
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-family: var(--font-mono);
}

/* Currency Table */
.currency-table-section {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
}

.table-controls {
    margin-bottom: var(--spacing-lg);
}

.search-input {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: all 0.2s ease;
}

.search-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.1);
}

.table-wrapper {
    overflow-x: auto;
}

.currency-table {
    width: 100%;
    border-collapse: collapse;
}

.currency-table th {
    background: var(--bg-secondary);
    padding: var(--spacing-md);
    text-align: left;
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-bottom: 2px solid var(--border-color);
}

.currency-table td {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
}

.currency-table tbody tr:hover {
    background: var(--bg-secondary);
}

.currency-name {
    font-weight: 600;
    color: var(--text-primary);
}

.currency-code {
    font-family: var(--font-mono);
    color: var(--text-secondary);
    font-weight: 600;
}

.currency-rate {
    font-family: var(--font-mono);
    font-weight: 600;
    color: var(--primary-color);
}

.table-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.875rem;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.2s ease;
}

.table-btn:hover {
    background: var(--primary-dark);
}

/* ========================================
   Sidebar
   ======================================== */
.sidebar {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

.sidebar-card {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
}

.sidebar-title {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

/* Transfer Services */
.transfer-services {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.transfer-service {
    display: block;
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: all 0.2s ease;
    text-decoration: none;
}

.transfer-service:hover {
    border-color: var(--primary-color);
    background: var(--bg-primary);
    transform: translateX(4px);
    box-shadow: var(--shadow-md);
}

.service-name {
    font-weight: 700;
    font-size: 1.125rem;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.service-desc {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* Info List */
.info-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.info-list li {
    color: var(--text-secondary);
    font-size: 0.9375rem;
}

/* ========================================
   Ads
   ======================================== */
.ad-container,
.ad-container-inline,
.ad-container-sidebar {
    margin: var(--spacing-xl) 0;
    text-align: center;
}

.ad-unit {
    min-height: 90px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    color: var(--text-light);
    font-size: 0.875rem;
}

/* ========================================
   SEO Content
   ======================================== */
.seo-content {
    background: var(--bg-primary);
    padding: var(--spacing-2xl) 0;
    margin-top: var(--spacing-2xl);
}

.content-article {
    max-width: 800px;
    margin: 0 auto;
}

.content-article h2 {
    color: var(--text-primary);
    margin-top: var(--spacing-2xl);
    margin-bottom: var(--spacing-lg);
}

.content-article h3 {
    color: var(--text-primary);
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-md);
}

.content-article h4 {
    color: var(--text-secondary);
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
}

.content-article p {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: var(--spacing-lg);
}

.content-article strong {
    color: var(--text-primary);
    font-weight: 600;
}

/* ========================================
   Footer
   ======================================== */
.footer {
    background: var(--text-primary);
    color: white;
    padding: var(--spacing-xl) 0;
    margin-top: var(--spacing-2xl);
}

.footer-content {
    text-align: center;
}

.footer-text {
    font-size: 0.9375rem;
    margin-bottom: var(--spacing-sm);
    opacity: 0.9;
}

.footer-disclaimer {
    font-size: 0.8125rem;
    opacity: 0.7;
    max-width: 600px;
    margin: 0 auto;
}

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 1024px) {
    .content-grid {
        grid-template-columns: 1fr;
    }
    
    .sidebar {
        order: 2;
    }
}

@media (max-width: 768px) {
    html {
        font-size: 14px;
    }
    
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .header {
        padding: var(--spacing-lg) 0;
    }
    
    .logo-text {
        font-size: 1.5rem;
    }
    
    .main-content {
        padding: var(--spacing-lg) 0;
    }
    
    .converter-card {
        padding: var(--spacing-lg);
    }
    
    .result-amount {
        font-size: 2rem;
    }
    
    .result-currency {
        font-size: 1.5rem;
    }
    
    .quick-actions {
        grid-template-columns: 1fr;
    }
    
    .popular-grid {
        grid-template-columns: 1fr;
    }
    
    .content-article {
        padding: 0 var(--spacing-md);
    }
}

@media (max-width: 480px) {
    .amount-input {
        font-size: 1.25rem;
    }
    
    .currency-select {
        font-size: 1rem;
    }
    
    .result-amount {
        font-size: 1.75rem;
    }
}

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

.converter-form,
.popular-conversions,
.currency-table-section {
    animation: fadeIn 0.5s ease;
}

/* ========================================
   Utility Classes
   ======================================== */
.hidden {
    display: none !important;
}

.text-center {
    text-align: center;
}

.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mt-3 { margin-top: var(--spacing-lg); }
.mt-4 { margin-top: var(--spacing-xl); }

.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }
.mb-3 { margin-bottom: var(--spacing-lg); }
.mb-4 { margin-bottom: var(--spacing-xl); }