/* ========================================
   ConvertCoin - Currency Converter Styles
   ======================================== */

/* CSS Variables for Color Palette */
:root {
    --primary-color: #1A535C;
    --secondary-color: #4ECDC4;
    --light-color: #F7FFF7;
    --accent-color: #FF6B6B;
    --warning-color: #FFE66D;
    
    /* Additional Colors */
    --dark-gray: #2c3e50;
    --light-gray: #ecf0f1;
    --white: #ffffff;
    --shadow: rgba(26, 83, 92, 0.1);
    --shadow-hover: rgba(26, 83, 92, 0.2);
    
    /* Typography */
    --font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --font-size-base: 16px;
    --line-height-base: 1.6;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* Border Radius */
    --border-radius-sm: 0.375rem;
    --border-radius-md: 0.5rem;
    --border-radius-lg: 0.75rem;
    --border-radius-xl: 1rem;
    
    /* Transitions */
    --transition-fast: 0.15s ease-in-out;
    --transition-normal: 0.3s ease-in-out;
    --transition-slow: 0.5s ease-in-out;
}

/* ========================================
   Base Styles
   ======================================== */

* {
    box-sizing: border-box;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: var(--line-height-base);
    color: var(--primary-color);
    background: linear-gradient(135deg, var(--light-color) 0%, #e8f5f3 100%);
    min-height: 100vh;
    margin: 0;
    padding: 0;
}

/* ========================================
   Header Styles
   ======================================== */

.header {
    background: linear-gradient(135deg, var(--primary-color) 0%, #145a63 100%);
    box-shadow: 0 2px 10px var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar-brand {
    color: var(--light-color) !important;
    font-size: 1.5rem;
    font-weight: 700;
    text-decoration: none;
    transition: var(--transition-normal);
}

.navbar-brand:hover {
    color: var(--secondary-color) !important;
    transform: translateY(-2px);
}

.navbar-brand i {
    color: var(--secondary-color);
}

/* ========================================
   Main Content Styles
   ======================================== */

.main-content {
    flex: 1;
    padding: var(--spacing-lg) 0;
}

/* Hero Section */
.hero-section {
    padding: var(--spacing-xl) 0;
}

.hero-title {
    color: var(--primary-color);
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.hero-title i {
    color: var(--secondary-color);
    animation: pulse 2s infinite;
}

.hero-subtitle {
    color: var(--dark-gray);
    font-size: 1.2rem;
    font-weight: 300;
    opacity: 0.8;
}

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

/* ========================================
   Card Styles
   ======================================== */

.converter-card,
.results-card,
.history-card {
    background: var(--white);
    border: none;
    border-radius: var(--border-radius-xl);
    box-shadow: 0 10px 30px var(--shadow);
    transition: var(--transition-normal);
    overflow: hidden;
}

.converter-card:hover,
.results-card:hover,
.history-card:hover {
    box-shadow: 0 15px 40px var(--shadow-hover);
    transform: translateY(-5px);
}

.card-header {
    background: linear-gradient(135deg, var(--secondary-color) 0%, #3db8b0 100%);
    color: var(--white);
    border: none;
    padding: var(--spacing-md) var(--spacing-lg);
}

.card-title {
    font-size: 1.3rem;
    font-weight: 600;
    margin: 0;
}

.card-body {
    padding: var(--spacing-lg);
}

/* ========================================
   Form Styles
   ======================================== */

.converter-form .form-group {
    margin-bottom: var(--spacing-md);
}

.form-label {
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    display: flex;
    align-items: center;
}

.form-label i {
    color: var(--secondary-color);
}

.form-control,
.form-select {
    border: 2px solid #e9ecef;
    border-radius: var(--border-radius-md);
    padding: 0.75rem 1rem;
    font-size: 1rem;
    transition: var(--transition-normal);
    background-color: var(--white);
}

.form-control:focus,
.form-select:focus {
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 0.2rem rgba(78, 205, 196, 0.25);
    background-color: var(--white);
}

.form-control.is-invalid,
.form-select.is-invalid {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 0.2rem rgba(255, 107, 107, 0.25);
}

.form-control.is-valid,
.form-select.is-valid {
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 0.2rem rgba(78, 205, 196, 0.25);
}

.invalid-feedback {
    color: var(--accent-color);
    font-size: 0.875rem;
    font-weight: 500;
}

.form-text {
    color: #6c757d;
    font-size: 0.875rem;
}

/* Amount Input Styling */
.amount-input {
    font-size: 1.2rem;
    font-weight: 600;
    text-align: center;
}

.currency-select {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3e%3cpath fill='none' stroke='%234ECDC4' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='m1 6 7 7 7-7'/%3e%3c/svg%3e");
}

/* ========================================
   Button Styles
   ======================================== */

.btn {
    border-radius: var(--border-radius-md);
    font-weight: 600;
    padding: 0.75rem 1.5rem;
    transition: var(--transition-normal);
    border: none;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color) 0%, #145a63 100%);
    color: var(--white);
    box-shadow: 0 4px 15px rgba(26, 83, 92, 0.3);
}

.btn-primary:hover {
    background: linear-gradient(135deg, #145a63 0%, var(--primary-color) 100%);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(26, 83, 92, 0.4);
}

.btn-outline-primary {
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
    background: transparent;
}

.btn-outline-primary:hover {
    background: var(--primary-color);
    color: var(--white);
    transform: translateY(-2px);
}

.btn-outline-secondary {
    border: 2px solid var(--secondary-color);
    color: var(--secondary-color);
    background: transparent;
}

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

.btn-outline-danger {
    border: 2px solid var(--accent-color);
    color: var(--accent-color);
    background: transparent;
}

.btn-outline-danger:hover {
    background: var(--accent-color);
    color: var(--white);
    transform: translateY(-2px);
}

.convert-btn {
    font-size: 1.1rem;
    padding: 1rem 2rem;
    min-height: 50px;
}

.swap-btn {
    border-radius: 50%;
    width: 50px;
    height: 50px;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

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

/* ========================================
   Results Styles
   ======================================== */

.conversion-result {
    text-align: center;
    padding: var(--spacing-lg);
    background: linear-gradient(135deg, var(--light-color) 0%, #f0f9f8 100%);
    border-radius: var(--border-radius-lg);
    margin-bottom: var(--spacing-md);
}

.result-amount {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin: var(--spacing-sm) 0;
}

.result-currencies {
    font-size: 1.2rem;
    color: var(--dark-gray);
    margin-bottom: var(--spacing-sm);
}

.result-original {
    font-size: 1rem;
    color: #6c757d;
    font-style: italic;
}

.exchange-rate-info {
    background: #f8f9fa;
    border-radius: var(--border-radius-md);
    padding: var(--spacing-md);
    border-left: 4px solid var(--secondary-color);
}

.exchange-rate-info h5 {
    color: var(--primary-color);
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.exchange-rate-info p {
    margin: 0;
    color: var(--dark-gray);
    font-size: 0.9rem;
}

/* ========================================
   History Styles
   ======================================== */

.history-item {
    background: var(--white);
    border: 1px solid #e9ecef;
    border-radius: var(--border-radius-md);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    transition: var(--transition-normal);
    cursor: pointer;
}

.history-item:hover {
    background: var(--light-color);
    border-color: var(--secondary-color);
    transform: translateX(5px);
}

.history-item:last-child {
    margin-bottom: 0;
}

.history-conversion {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.history-details {
    flex: 1;
    min-width: 200px;
}

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

.history-currencies {
    font-size: 0.9rem;
    color: var(--dark-gray);
}

.history-date {
    font-size: 0.8rem;
    color: #6c757d;
    text-align: right;
}

.empty-history {
    color: #6c757d;
}

.empty-history i {
    opacity: 0.5;
}

/* ========================================
   Loading Spinner
   ======================================== */

.loading-spinner {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.8);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 9999;
}

.loading-spinner.show {
    display: flex;
}

/* ========================================
   Toast Styles
   ======================================== */

.toast {
    border: none;
    border-radius: var(--border-radius-md);
    box-shadow: 0 4px 15px var(--shadow);
}

.toast-header {
    background: var(--secondary-color);
    color: var(--white);
    border: none;
}

.toast-body {
    background: var(--white);
    color: var(--primary-color);
}

/* Toast Variants */
.toast.toast-success .toast-header {
    background: #28a745;
}

.toast.toast-error .toast-header {
    background: var(--accent-color);
}

.toast.toast-warning .toast-header {
    background: var(--warning-color);
    color: var(--primary-color);
}

/* ========================================
   Footer Styles
   ======================================== */

.footer {
    background: var(--primary-color);
    color: var(--light-color);
    padding: var(--spacing-lg) 0;
    margin-top: auto;
}

.footer-text {
    font-size: 0.9rem;
    opacity: 0.9;
}

.footer-text a {
    color: var(--secondary-color);
    text-decoration: none;
    transition: var(--transition-normal);
}

.footer-text a:hover {
    color: var(--light-color);
    text-decoration: underline;
}

/* ========================================
   Utility Classes
   ======================================== */

.text-primary-custom {
    color: var(--primary-color) !important;
}

.text-secondary-custom {
    color: var(--secondary-color) !important;
}

.bg-primary-custom {
    background-color: var(--primary-color) !important;
}

.bg-secondary-custom {
    background-color: var(--secondary-color) !important;
}

.border-primary-custom {
    border-color: var(--primary-color) !important;
}

.border-secondary-custom {
    border-color: var(--secondary-color) !important;
}

/* ========================================
   Animations
   ======================================== */

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

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

@keyframes bounceIn {
    0% {
        opacity: 0;
        transform: scale(0.3);
    }
    50% {
        opacity: 1;
        transform: scale(1.05);
    }
    70% {
        transform: scale(0.9);
    }
    100% {
        opacity: 1;
        transform: scale(1);
    }
}

.fade-in {
    animation: fadeIn 0.5s ease-out;
}

.slide-in {
    animation: slideIn 0.5s ease-out;
}

.bounce-in {
    animation: bounceIn 0.6s ease-out;
}

/* ========================================
   Responsive Design
   ======================================== */

/* Extra Large Devices (1200px and up) */
@media (min-width: 1200px) {
    .hero-title {
        font-size: 3rem;
    }
    
    .hero-subtitle {
        font-size: 1.3rem;
    }
    
    .container {
        max-width: 1140px;
    }
}

/* Large Devices (992px and up) */
@media (min-width: 992px) {
    .main-content {
        padding: var(--spacing-xl) 0;
    }
    
    .hero-section {
        padding: 4rem 0;
    }
}

/* Medium Devices (768px and up) */
@media (min-width: 768px) {
    .history-conversion {
        flex-wrap: nowrap;
    }
    
    .history-date {
        text-align: right;
        min-width: 120px;
    }
}

/* Small Devices (576px and up) */
@media (min-width: 576px) {
    .converter-card,
    .results-card,
    .history-card {
        margin: 0 var(--spacing-sm);
    }
}

/* Extra Small Devices (less than 576px) */
@media (max-width: 575.98px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .card-body {
        padding: var(--spacing-md);
    }
    
    .card-header {
        padding: var(--spacing-md);
    }
    
    .card-title {
        font-size: 1.1rem;
    }
    
    .result-amount {
        font-size: 2rem;
    }
    
    .btn {
        padding: 0.6rem 1.2rem;
    }
    
    .convert-btn {
        font-size: 1rem;
        padding: 0.8rem 1.5rem;
    }
    
    .history-conversion {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-xs);
    }
    
    .history-date {
        text-align: left;
        font-size: 0.75rem;
    }
    
    .amount-input {
        font-size: 1.1rem;
    }
    
    .main-content {
        padding: var(--spacing-md) 0;
    }
    
    .hero-section {
        padding: var(--spacing-lg) 0;
    }
}

/* Very Small Devices (less than 400px) */
@media (max-width: 399.98px) {
    .hero-title {
        font-size: 1.8rem;
    }
    
    .result-amount {
        font-size: 1.8rem;
    }
    
    .card-body {
        padding: var(--spacing-sm);
    }
    
    .btn {
        padding: 0.5rem 1rem;
        font-size: 0.9rem;
    }
    
    .swap-btn {
        width: 45px;
        height: 45px;
    }
}

/* ========================================
   Print Styles
   ======================================== */

@media print {
    .header,
    .footer,
    .btn,
    .toast-container,
    .loading-spinner {
        display: none !important;
    }
    
    .main-content {
        padding: 0;
    }
    
    .converter-card,
    .results-card,
    .history-card {
        box-shadow: none;
        border: 1px solid #ddd;
    }
    
    body {
        background: white;
        color: black;
    }
}

/* ========================================
   Accessibility Improvements
   ======================================== */

/* Focus Styles */
.btn:focus,
.form-control:focus,
.form-select:focus {
    outline: 2px solid var(--secondary-color);
    outline-offset: 2px;
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    .swap-btn:hover {
        transform: scale(1.1);
    }
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
    :root {
        --shadow: rgba(0, 0, 0, 0.3);
        --shadow-hover: rgba(0, 0, 0, 0.5);
    }
    
    .form-control,
    .form-select {
        border-width: 3px;
    }
    
    .btn {
        border-width: 3px;
    }
}

/* Dark Mode Support */
@media (prefers-color-scheme: dark) {
    :root {
        --light-color: #2c3e50;
        --white: #34495e;
        --dark-gray: #ecf0f1;
        --light-gray: #34495e;
    }
    
    body {
        background: linear-gradient(135deg, #2c3e50 0%, #34495e 100%);
        color: var(--light-color);
    }
    
    .converter-card,
    .results-card,
    .history-card {
        background: var(--white);
        color: var(--dark-gray);
    }
    
    .form-control,
    .form-select {
        background-color: var(--white);
        color: var(--dark-gray);
        border-color: #495057;
    }
}