/* CSS Variables for Color Palette */
:root {
  --primary-dark: #393E46;
  --secondary-dark: #222831;
  --accent-cyan: #00ADB5;
  --light-gray: #EEEEEE;
  --accent-yellow: #FFD369;
  
  /* Additional colors for better UX */
  --white: #ffffff;
  --black: #000000;
  --success: #28a745;
  --danger: #dc3545;
  --warning: #ffc107;
  --info: #17a2b8;
  
  /* Typography */
  --font-primary: 'Helvetica Neue', Arial, sans-serif;
  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-xxl: 3rem;
  
  /* Border radius */
  --border-radius-sm: 0.25rem;
  --border-radius-md: 0.5rem;
  --border-radius-lg: 0.75rem;
  
  /* Shadows */
  --shadow-sm: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
  --shadow-md: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);
  --shadow-lg: 0 1rem 3rem rgba(0, 0, 0, 0.175);
  
  /* Transitions */
  --transition-fast: 0.15s ease-in-out;
  --transition-normal: 0.3s ease-in-out;
  --transition-slow: 0.5s ease-in-out;
}

/* Dark Mode Variables */
[data-theme="dark"] {
  --bs-body-bg: var(--secondary-dark);
  --bs-body-color: var(--light-gray);
  --bs-primary: var(--accent-cyan);
  --bs-secondary: var(--primary-dark);
  --bs-light: var(--primary-dark);
  --bs-dark: var(--light-gray);
}

/* Base Styles - Swiss Style Typography */
* {
  box-sizing: border-box;
}

body {
  font-family: var(--font-primary);
  font-weight: var(--font-weight-normal);
  line-height: 1.6;
  color: var(--primary-dark);
  background-color: var(--light-gray);
  transition: background-color var(--transition-normal), color var(--transition-normal);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.75rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1rem; }

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

/* Header Styles */
.header {
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--secondary-dark) 100%);
  color: var(--white);
  box-shadow: var(--shadow-md);
  position: sticky;
  top: 0;
  z-index: 1020;
}

.header__title {
  font-size: 1.5rem;
  font-weight: var(--font-weight-bold);
  color: var(--white);
}

/* Main Content */
.main {
  flex: 1;
  padding-bottom: var(--spacing-xxl);
}

/* Converter Card */
.converter-card {
  border: none;
  border-radius: var(--border-radius-lg);
  background: var(--white);
  transition: all var(--transition-normal);
  max-width: 600px;
  margin: 0 auto;
}

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

.converter-form {
  position: relative;
}

/* Form Elements */
.form-label {
  color: var(--primary-dark);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-sm);
}

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

.form-control:focus,
.form-select:focus {
  border-color: var(--accent-cyan);
  box-shadow: 0 0 0 0.2rem rgba(0, 173, 181, 0.25);
}

.input-group-text {
  background-color: var(--accent-cyan);
  border-color: var(--accent-cyan);
  color: var(--white);
  font-weight: var(--font-weight-medium);
}

/* Buttons */
.btn {
  border-radius: var(--border-radius-md);
  font-weight: var(--font-weight-medium);
  padding: 0.75rem 1.5rem;
  transition: all var(--transition-fast);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.btn-primary {
  background-color: var(--accent-cyan);
  border-color: var(--accent-cyan);
  color: var(--white);
}

.btn-primary:hover {
  background-color: #009aa1;
  border-color: #009aa1;
  transform: translateY(-1px);
}

.btn-outline-primary {
  color: var(--accent-cyan);
  border-color: var(--accent-cyan);
}

.btn-outline-primary:hover {
  background-color: var(--accent-cyan);
  border-color: var(--accent-cyan);
  color: var(--white);
}

.btn-outline-secondary {
  color: var(--primary-dark);
  border-color: var(--primary-dark);
}

.btn-outline-secondary:hover {
  background-color: var(--primary-dark);
  border-color: var(--primary-dark);
  color: var(--white);
}

/* Result Display */
.result-container {
  animation: fadeInUp 0.5s ease-out;
}

.result-card {
  background: linear-gradient(135deg, var(--accent-cyan) 0%, #009aa1 100%);
  color: var(--white);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-md);
}

.result-amount {
  font-size: 2rem;
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-xs);
}

.result-rate {
  font-size: 0.9rem;
  opacity: 0.9;
}

/* Status Alert */
.alert {
  border-radius: var(--border-radius-md);
  border: none;
  font-weight: var(--font-weight-medium);
}

.alert-info {
  background-color: rgba(0, 173, 181, 0.1);
  color: var(--accent-cyan);
}

.alert-warning {
  background-color: rgba(255, 211, 105, 0.1);
  color: #b8860b;
}

/* FAQ Section */
.faq-section {
  max-width: 800px;
  margin: 0 auto;
}

.section-title {
  color: var(--primary-dark);
  font-weight: var(--font-weight-bold);
  text-align: center;
  margin-bottom: var(--spacing-xl);
  position: relative;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -10px;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 3px;
  background-color: var(--accent-cyan);
  border-radius: 2px;
}

.accordion-item {
  border: none;
  margin-bottom: var(--spacing-sm);
  border-radius: var(--border-radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.accordion-button {
  background-color: var(--white);
  color: var(--primary-dark);
  font-weight: var(--font-weight-semibold);
  border: none;
  padding: 1rem 1.25rem;
}

.accordion-button:not(.collapsed) {
  background-color: var(--accent-cyan);
  color: var(--white);
}

.accordion-button:focus {
  box-shadow: none;
  border-color: transparent;
}

.accordion-body {
  background-color: var(--white);
  color: var(--primary-dark);
  padding: 1.25rem;
}

/* Modal Styles */
.modal-content {
  border: none;
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-lg);
}

.modal-header {
  background-color: var(--primary-dark);
  color: var(--white);
  border-bottom: none;
  border-radius: var(--border-radius-lg) var(--border-radius-lg) 0 0;
}

.modal-title {
  font-weight: var(--font-weight-bold);
}

.btn-close {
  filter: invert(1);
}

.settings-option {
  padding: var(--spacing-md);
  border: 1px solid #e9ecef;
  border-radius: var(--border-radius-md);
  margin-bottom: var(--spacing-md);
}

.form-check-input:checked {
  background-color: var(--accent-cyan);
  border-color: var(--accent-cyan);
}

.settings-info {
  padding: var(--spacing-md);
  background-color: #f8f9fa;
  border-radius: var(--border-radius-md);
}

/* Offcanvas Styles */
.offcanvas {
  border: none;
  box-shadow: var(--shadow-lg);
}

.offcanvas-header {
  background-color: var(--primary-dark);
  color: var(--white);
}

.offcanvas-title {
  font-weight: var(--font-weight-bold);
}

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

.history-item:hover {
  background-color: #f8f9fa;
  transform: translateX(5px);
}

.history-amount {
  font-weight: var(--font-weight-bold);
  color: var(--accent-cyan);
}

.history-rate {
  font-size: 0.85rem;
  color: #6c757d;
}

.history-date {
  font-size: 0.75rem;
  color: #6c757d;
}

.tips-section {
  padding-top: var(--spacing-lg);
  border-top: 1px solid #e9ecef;
}

.tip-item {
  display: flex;
  align-items: flex-start;
}

/* Advertisement Placeholders */
.ad-banner,
.mobile-ad-banner {
  background-color: #f8f9fa;
  border: 2px dashed #dee2e6;
  border-radius: var(--border-radius-md);
  min-height: 100px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.ad-placeholder,
.ad-placeholder-mobile {
  display: flex;
  flex-direction: column;
  align-items: center;
  color: #6c757d;
  font-size: 0.9rem;
}

.ad-placeholder i,
.ad-placeholder-mobile i {
  font-size: 2rem;
  margin-bottom: var(--spacing-xs);
}

.mobile-ad-banner {
  min-height: 60px;
}

/* Footer */
.footer {
  background-color: var(--primary-dark);
  color: var(--white);
  margin-top: auto;
}

.footer p {
  margin-bottom: 0;
  font-size: 0.9rem;
}

/* Animations */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

.pulse {
  animation: pulse 2s infinite;
}

/* Loading States */
.loading {
  position: relative;
  pointer-events: none;
}

.loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 20px;
  height: 20px;
  border: 2px solid #f3f3f3;
  border-top: 2px solid var(--accent-cyan);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% { transform: translate(-50%, -50%) rotate(0deg); }
  100% { transform: translate(-50%, -50%) rotate(360deg); }
}

/* Dark Mode Styles */
[data-theme="dark"] body {
  background-color: var(--secondary-dark);
  color: var(--light-gray);
}

[data-theme="dark"] .converter-card {
  background-color: var(--primary-dark);
  color: var(--light-gray);
}

[data-theme="dark"] .form-label {
  color: var(--light-gray);
}

[data-theme="dark"] .form-control,
[data-theme="dark"] .form-select {
  background-color: var(--secondary-dark);
  border-color: #495057;
  color: var(--light-gray);
}

[data-theme="dark"] .form-control:focus,
[data-theme="dark"] .form-select:focus {
  background-color: var(--secondary-dark);
  border-color: var(--accent-cyan);
  color: var(--light-gray);
}

[data-theme="dark"] .accordion-item {
  background-color: var(--primary-dark);
}

[data-theme="dark"] .accordion-button {
  background-color: var(--primary-dark);
  color: var(--light-gray);
}

[data-theme="dark"] .accordion-body {
  background-color: var(--primary-dark);
  color: var(--light-gray);
}

[data-theme="dark"] .modal-content {
  background-color: var(--primary-dark);
  color: var(--light-gray);
}

[data-theme="dark"] .modal-body {
  background-color: var(--primary-dark);
}

[data-theme="dark"] .settings-option {
  border-color: #495057;
  background-color: var(--secondary-dark);
}

[data-theme="dark"] .settings-info {
  background-color: var(--secondary-dark);
}

[data-theme="dark"] .offcanvas {
  background-color: var(--primary-dark);
  color: var(--light-gray);
}

[data-theme="dark"] .history-item {
  background-color: var(--secondary-dark);
  border-color: #495057;
  color: var(--light-gray);
}

[data-theme="dark"] .history-item:hover {
  background-color: var(--primary-dark);
}

[data-theme="dark"] .ad-banner,
[data-theme="dark"] .mobile-ad-banner {
  background-color: var(--primary-dark);
  border-color: #495057;
}

[data-theme="dark"] .section-title {
  color: var(--light-gray);
}

/* Responsive Design */
@media (max-width: 576px) {
  .header__title {
    font-size: 1.25rem;
  }
  
  .result-amount {
    font-size: 1.5rem;
  }
  
  .converter-card {
    margin: 0 1rem;
  }
  
  .btn {
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
  }
  
  .form-control,
  .form-select {
    padding: 0.5rem 0.75rem;
  }
  
  .modal-dialog {
    margin: 1rem;
  }
  
  .offcanvas {
    width: 90vw !important;
  }
  
  .ad-banner {
    margin: 0 1rem;
  }
}

@media (min-width: 577px) and (max-width: 768px) {
  .converter-card {
    margin: 0 2rem;
  }
}

@media (min-width: 769px) {
  .ad-banner {
    max-width: 800px;
    margin: 0 auto;
  }
  
  .mobile-ad-banner {
    display: none;
  }
}

@media (min-width: 992px) {
  .container {
    max-width: 960px;
  }
  
  .result-amount {
    font-size: 2.5rem;
  }
}

@media (min-width: 1200px) {
  .container {
    max-width: 1140px;
  }
}

/* Print Styles */
@media print {
  .header,
  .footer,
  .ad-banner,
  .mobile-ad-banner,
  .btn,
  .modal,
  .offcanvas {
    display: none !important;
  }
  
  body {
    background: white !important;
    color: black !important;
  }
  
  .converter-card {
    box-shadow: none !important;
    border: 1px solid #ccc !important;
  }
}

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

/* High Contrast Mode */
@media (prefers-contrast: high) {
  .btn-primary {
    background-color: #000;
    border-color: #000;
  }
  
  .form-control:focus,
  .form-select:focus {
    border-color: #000;
    box-shadow: 0 0 0 0.2rem rgba(0, 0, 0, 0.25);
  }
}

/* Focus Indicators */
.btn:focus,
.form-control:focus,
.form-select:focus,
.form-check-input:focus {
  outline: 2px solid var(--accent-cyan);
  outline-offset: 2px;
}

/* Screen Reader Only */
.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;
}