/* CSS Reset and Base Styles */
:root {
  /* Colors */
  --primary: #3b82f6;
  --primary-dark: #2563eb;
  --primary-light: #60a5fa;
  --secondary: #10b981;
  --secondary-dark: #059669;
  --danger: #ef4444;
  --warning: #f59e0b;
  --success: #10b981;
  --info: #3b82f6;
  
  /* Neutrals */
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;
  --surface: #1e293b;
  --surface-hover: #334155;
  
  /* Text Colors */
  --text-primary: #f1f5f9;
  --text-secondary: #cbd5e1;
  --text-tertiary: #94a3b8;
  
  /* Borders */
  --border-color: #334155;
  --border-radius: 8px;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  
  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-base: 200ms ease-in-out;
  --transition-slow: 300ms ease-in-out;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.5;
  min-height: 100vh;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.25;
  margin-bottom: var(--spacing-md);
}

h1 {
  font-size: 2.5rem;
  font-weight: 700;
}

h2 {
  font-size: 2rem;
}

h3 {
  font-size: 1.5rem;
}

h4 {
  font-size: 1.25rem;
}

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

a {
  color: var(--primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

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

.main-content {
  min-height: calc(100vh - 200px);
  padding: var(--spacing-2xl) 0;
}

/* Header */
.header {
  background-color: var(--surface);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(10px);
  background-color: rgba(30, 41, 59, 0.95);
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-md) 0;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
}

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

/* Navigation */
.nav {
  display: flex;
  gap: var(--spacing-lg);
}

.nav-link {
  color: var(--text-secondary);
  font-weight: 500;
  transition: color var(--transition-fast);
  position: relative;
}

.nav-link:hover {
  color: var(--text-primary);
}

.nav-link.active {
  color: var(--primary);
}

/* User Info */
.user-info {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
}

.balance-display {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  background-color: var(--bg-tertiary);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--border-radius);
  border: 1px solid var(--border-color);
}

.balance-display i {
  color: var(--warning);
}

#balance-amount {
  font-weight: 600;
  color: var(--text-primary);
}

.currency-selector {
  background-color: transparent;
  border: none;
  color: var(--text-secondary);
  font-size: 0.875rem;
  cursor: pointer;
  outline: none;
}

/* User Menu */
.user-menu {
  position: relative;
}

.user-menu-btn {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.user-menu-btn:hover {
  background-color: var(--surface-hover);
  border-color: var(--primary);
}

.user-dropdown {
  position: absolute;
  top: 100%;
  right: 0;
  margin-top: var(--spacing-sm);
  background-color: var(--surface);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-lg);
  min-width: 200px;
  overflow: hidden;
}

.menu-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  color: var(--text-secondary);
  background: none;
  border: none;
  text-align: left;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.menu-item:hover {
  background-color: var(--surface-hover);
  color: var(--text-primary);
}

.menu-divider {
  height: 1px;
  background-color: var(--border-color);
  margin: var(--spacing-xs) 0;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--border-radius);
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: none;
  outline: none;
  position: relative;
  overflow: hidden;
}

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

.btn-primary:hover {
  background-color: var(--primary-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow);
}

.btn-secondary {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

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

.btn-success {
  background-color: var(--success);
  color: white;
}

.btn-danger {
  background-color: var(--danger);
  color: white;
}

.btn-full {
  width: 100%;
}

.btn-loader {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.btn-loader.hidden + .btn-text {
  opacity: 1;
}

.btn-loader:not(.hidden) + .btn-text {
  opacity: 0;
}

/* Forms */
.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-group label {
  display: block;
  margin-bottom: var(--spacing-sm);
  font-weight: 500;
  color: var(--text-secondary);
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  color: var(--text-primary);
  font-size: 1rem;
  transition: all var(--transition-fast);
  outline: none;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.input-icon {
  position: absolute;
  left: var(--spacing-md);
  color: var(--text-tertiary);
}

.input-wrapper input {
  padding-left: 2.5rem;
}

.input-hint {
  font-size: 0.875rem;
  color: var(--text-tertiary);
  margin-top: var(--spacing-xs);
}

/* Modals */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.75);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: var(--spacing-lg);
  backdrop-filter: blur(4px);
}

.modal.hidden {
  display: none;
}

.modal-content {
  background-color: var(--surface);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-lg);
  max-width: 500px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
}

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

.modal-header h2 {
  margin: 0;
}

.modal-close {
  background: none;
  border: none;
  color: var(--text-tertiary);
  font-size: 1.25rem;
  cursor: pointer;
  padding: var(--spacing-sm);
  border-radius: var(--border-radius);
  transition: all var(--transition-fast);
}

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

/* Cards */
.card {
  background-color: var(--surface);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: var(--spacing-lg);
}

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

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

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

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

.text-success {
  color: var(--success);
}

.text-danger {
  color: var(--danger);
}

.text-warning {
  color: var(--warning);
}

.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); }

/* Animations */
@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

@keyframes slideIn {
  from {
    transform: translateY(-10px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

.fa-spin {
  animation: spin 1s linear infinite;
}

/* Toast Notifications */
.toast-container {
  position: fixed;
  top: var(--spacing-lg);
  right: var(--spacing-lg);
  z-index: 2000;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.toast {
  background-color: var(--surface);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: var(--spacing-md);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  min-width: 300px;
  animation: slideIn var(--transition-slow);
}

.toast.success {
  border-left: 4px solid var(--success);
}

.toast.error {
  border-left: 4px solid var(--danger);
}

.toast.warning {
  border-left: 4px solid var(--warning);
}

.toast.info {
  border-left: 4px solid var(--info);
}

/* Footer */
.footer {
  background-color: var(--surface);
  border-top: 1px solid var(--border-color);
  margin-top: var(--spacing-2xl);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-2xl);
  padding: var(--spacing-2xl) 0;
}

.footer-section h4 {
  color: var(--text-primary);
  margin-bottom: var(--spacing-md);
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: var(--spacing-sm);
}

.footer-links a {
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

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

.social-links {
  display: flex;
  gap: var(--spacing-md);
  margin-top: var(--spacing-md);
}

.social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background-color: var(--bg-tertiary);
  border-radius: 50%;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

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

.footer-bottom {
  text-align: center;
  padding: var(--spacing-lg) 0;
  border-top: 1px solid var(--border-color);
  color: var(--text-tertiary);
}

/* Server Status */
.server-status {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.status-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  color: var(--text-secondary);
}

.status-indicator {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--text-tertiary);
}

.status-indicator.online {
  background-color: var(--success);
  box-shadow: 0 0 0 2px rgba(16, 185, 129, 0.2);
  animation: pulse 2s infinite;
}

/* Responsive Design */
@media (max-width: 768px) {
  .header-content {
    flex-wrap: wrap;
  }
  
  .nav {
    display: none;
  }
  
  .footer-content {
    grid-template-columns: 1fr;
  }
  
  .modal-content {
    margin: var(--spacing-md);
  }
}