:root {
  --primary-color: #667eea;
  --primary-dark: #5a6fd8;
  --secondary-color: #764ba2;
  --accent-color: #f093fb;
  --success-color: #4ecdc4;
  --warning-color: #ffe066;
  --error-color: #ff6b6b;
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;
  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --border-color: #475569;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
}

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

body {
  background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
  color: var(--text-primary);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  line-height: 1.6;
  min-height: 100vh;
}

/* Navigation */
.navbar {
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color)) !important;
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-lg);
  border: none;
  padding: 1rem 0;
}

.navbar-brand {
  font-weight: 700;
  font-size: 1.5rem;
  text-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

.navbar-nav .nav-link {
  font-weight: 500;
  margin: 0 0.5rem;
  padding: 0.5rem 1rem !important;
  border-radius: 0.5rem;
  transition: all 0.3s ease;
}

.navbar-nav .nav-link:hover {
  background: rgba(255,255,255,0.1);
  transform: translateY(-1px);
}

/* Main Content */
.container {
  max-width: 1200px;
  margin: 2rem auto;
  padding: 0 1rem;
}

/* Hero Section */
.hero {
  text-align: center;
  padding: 4rem 0;
  background: linear-gradient(135deg, rgba(102, 126, 234, 0.1), rgba(118, 75, 162, 0.1));
  border-radius: 1rem;
  margin-bottom: 3rem;
  border: 1px solid var(--border-color);
}

.hero h1 {
  font-size: 3.5rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--accent-color), var(--primary-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 1rem;
}

.hero p {
  font-size: 1.2rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
}

/* Cards */
.card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 1rem;
  box-shadow: var(--shadow-xl);
  transition: all 0.3s ease;
  overflow: hidden;
  color: var(--text-primary);
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-xl), 0 0 0 1px var(--primary-color);
}

.card-header {
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  border: none;
  padding: 1.5rem;
  font-weight: 600;
  color: var(--text-primary);
}

.card-body {
  padding: 2rem;
  color: var(--text-primary);
}

.card-body .text-muted {
  color: var(--text-secondary) !important;
}

.card-body .small {
  color: var(--text-secondary) !important;
}

.card-body .fw-bold,
.card-body .fw-medium {
  color: var(--text-primary) !important;
}

/* Forms */
.form-group {
  margin-bottom: 1.5rem;
}

.form-label {
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
  display: block;
}

.form-control {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 0.75rem;
  color: var(--text-primary);
  padding: 1rem;
  font-size: 1rem;
  transition: all 0.3s ease;
}

.form-control:focus {
  background: var(--bg-tertiary);
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
  color: var(--text-primary);
}

.form-control::placeholder {
  color: var(--text-muted);
}

/* Buttons */
.btn {
  padding: 0.75rem 2rem;
  font-weight: 600;
  border-radius: 0.75rem;
  transition: all 0.3s ease;
  border: none;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: white;
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--primary-dark), var(--secondary-color));
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-success {
  background: linear-gradient(135deg, var(--success-color), #45b7aa);
  color: white;
}

.btn-danger {
  background: linear-gradient(135deg, var(--error-color), #e55555);
  color: white;
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
}

/* URL List */
.url-item {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 1rem;
  padding: 1.5rem;
  margin-bottom: 1rem;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.url-item:hover {
  transform: translateX(5px);
  border-color: var(--primary-color);
  box-shadow: var(--shadow-lg);
}

.url-item::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
}

.url-short {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary-color);
  text-decoration: none;
  margin-bottom: 0.5rem;
  display: block;
}

.url-short:hover {
  color: var(--accent-color);
}

.url-long {
  color: var(--text-secondary);
  font-size: 0.95rem;
  word-break: break-all;
  margin-bottom: 1rem;
}

.url-stats {
  display: flex;
  gap: 1rem;
  margin-bottom: 1rem;
}

.stat-item {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  color: var(--text-muted);
  font-size: 0.875rem;
}

.url-actions {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

/* Stats Dashboard */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.stat-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 1rem;
  padding: 1.5rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.stat-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
}

.stat-number {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--primary-color);
  display: block;
}

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

/* Copy Button */
.copy-btn {
  position: relative;
  overflow: hidden;
}

.copy-btn.copied {
  background: var(--success-color) !important;
}

/* QR Code Modal */
.qr-container {
  text-align: center;
  padding: 2rem;
}

.qr-code {
  background: white;
  padding: 1rem;
  border-radius: 0.5rem;
  display: inline-block;
  margin: 1rem 0;
}

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

.fade-in-up {
  animation: fadeInUp 0.6s ease-out;
}

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

.pulse {
  animation: pulse 2s infinite;
}

/* Toast Notifications */
.toast-container {
  position: fixed;
  top: 2rem;
  right: 2rem;
  z-index: 1050;
}

.toast {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 0.75rem;
  color: var(--text-primary);
  box-shadow: var(--shadow-xl);
  margin-bottom: 0.5rem;
  min-width: 300px;
}

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

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

/* Login/Register Forms */
.auth-container {
  max-width: 400px;
  margin: 4rem auto;
}

.auth-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 1rem;
  padding: 2rem;
  box-shadow: var(--shadow-xl);
}

.auth-header {
  text-align: center;
  margin-bottom: 2rem;
}

.auth-header h3 {
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.auth-header p {
  color: var(--text-secondary);
}

/* Loading States */
.loading {
  opacity: 0.6;
  pointer-events: none;
}

.spinner {
  display: inline-block;
  width: 1rem;
  height: 1rem;
  border: 2px solid transparent;
  border-top: 2px solid currentColor;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

/* Responsive */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 2.5rem;
  }
  
  .stats-grid {
    grid-template-columns: 1fr;
  }
  
  .url-actions {
    flex-direction: column;
  }
  
  .toast-container {
    left: 1rem;
    right: 1rem;
  }
}

/* Table styling for better visibility */
.table {
  color: var(--text-primary);
}

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

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

.table-hover tbody tr:hover {
  background-color: rgba(255, 255, 255, 0.05);
}

/* Ensure all text in cards is visible */
.card h1, .card h2, .card h3, .card h4, .card h5, .card h6 {
  color: var(--text-primary);
}

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

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

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

.card .text-muted {
  color: var(--text-muted) !important;
}

/* Override Bootstrap text classes for better contrast */
.text-muted {
  color: var(--text-secondary) !important;
}

.text-info {
  color: #60a5fa !important;
}

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

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

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

/* Ensure all p tags have good contrast */
p {
  color: var(--text-primary);
}

p.text-muted,
small.text-muted {
  color: var(--text-secondary) !important;
}

/* List group items */
.list-group-item {
  background-color: transparent;
  border-color: var(--border-color);
  color: var(--text-primary);
}

.list-group-item:hover {
  background-color: rgba(102, 126, 234, 0.1);
}

/* Ensure links are visible */
a {
  color: var(--primary-color);
}

a:hover {
  color: var(--accent-color);
}

/* Dark scrollbar */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--primary-color);
}