/* ===================================
   CSS Variables & Theme
   =================================== */
:root {
  /* Colors */
  --bg-primary: #0d0d0f;
  --bg-secondary: #13131a;
  --bg-tertiary: #1a1a24;
  --bg-card: #16161f;
  --bg-card-hover: #1c1c28;
  
  --text-primary: #ffffff;
  --text-secondary: #a0a0b0;
  --text-muted: #6b6b7b;
  
  --accent-primary: #6366f1;
  --accent-primary-hover: #818cf8;
  --accent-secondary: #8b5cf6;
  
  --lambda-color: #ff9500;
  --lambda-bg: rgba(255, 149, 0, 0.1);
  --cloudflare-color: #f48120;
  --cloudflare-bg: rgba(244, 129, 32, 0.1);
  
  --success-color: #22c55e;
  --success-bg: rgba(34, 197, 94, 0.1);
  --error-color: #ef4444;
  --error-bg: rgba(239, 68, 68, 0.1);
  --warning-color: #f59e0b;
  --warning-bg: rgba(245, 158, 11, 0.1);
  
  --border-color: #2a2a3a;
  --border-color-light: #3a3a4a;
  
  /* 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;
  --radius-full: 9999px;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -2px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -4px rgba(0, 0, 0, 0.4);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.5), 0 8px 10px -6px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.3);
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow: 350ms ease;
  
  /* Font */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

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

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

body {
  font-family: var(--font-family);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ===================================
   Layout
   =================================== */
.app-container {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  max-width: 1400px;
  margin: 0 auto;
  padding: var(--spacing-lg);
}

/* ===================================
   Header
   =================================== */
.header {
  text-align: center;
  padding: var(--spacing-2xl) 0;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: var(--spacing-2xl);
}

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

.logo-icon {
  width: 48px;
  height: 48px;
  color: var(--accent-primary);
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.7; }
}

.logo h1 {
  font-size: 2.5rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.subtitle {
  color: var(--text-secondary);
  font-size: 1.125rem;
  font-weight: 400;
}

/* ===================================
   Main Content
   =================================== */
.main-content {
  flex: 1;
}

.section-title {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: var(--spacing-lg);
  color: var(--text-primary);
}

/* ===================================
   Status Section
   =================================== */
.status-section {
  margin-bottom: var(--spacing-2xl);
}

.status-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
}

.status-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--spacing-lg);
  transition: all var(--transition-normal);
}

.status-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-color-light);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.status-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.service-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.service-icon svg {
  width: 24px;
  height: 24px;
}

.lambda-icon {
  background: var(--lambda-bg);
  color: var(--lambda-color);
}

.cloudflare-icon {
  background: var(--cloudflare-bg);
  color: var(--cloudflare-color);
}

.service-info h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
}

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

.status-indicator {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-lg);
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--bg-tertiary);
  border-radius: var(--radius-md);
}

.status-dot {
  width: 10px;
  height: 10px;
  border-radius: var(--radius-full);
  flex-shrink: 0;
}

.status-dot.unknown {
  background: var(--text-muted);
}

.status-dot.healthy,
.status-dot.online {
  background: var(--success-color);
  box-shadow: 0 0 8px var(--success-color);
  animation: glow 1.5s ease-in-out infinite alternate;
}

.status-dot.unhealthy,
.status-dot.offline {
  background: var(--error-color);
  box-shadow: 0 0 8px var(--error-color);
}

.status-dot.loading {
  background: var(--warning-color);
  animation: blink 1s ease-in-out infinite;
}

@keyframes glow {
  from { opacity: 0.8; }
  to { opacity: 1; }
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

.status-text {
  font-size: 0.875rem;
  font-weight: 500;
}

.check-health-btn {
  width: 100%;
}

/* ===================================
   Converters Grid
   =================================== */
.converters-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-2xl);
}

.converter-section {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  transition: all var(--transition-normal);
}

.converter-section:hover {
  border-color: var(--border-color-light);
}

.converter-header {
  margin-bottom: var(--spacing-xl);
}

.converter-badge {
  display: inline-block;
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--spacing-sm);
}

.converter-badge.lambda {
  background: var(--lambda-bg);
  color: var(--lambda-color);
}

.converter-badge.cloudflare {
  background: var(--cloudflare-bg);
  color: var(--cloudflare-color);
}

.converter-header h2 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

.converter-header p {
  color: var(--text-secondary);
  font-size: 0.875rem;
}

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

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

.form-group label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-primary);
}

.form-group input {
  width: 100%;
  padding: var(--spacing-md);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 1rem;
  font-family: inherit;
  transition: all var(--transition-fast);
}

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

.form-group input:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

.form-group input:invalid:not(:placeholder-shown) {
  border-color: var(--error-color);
}

.form-help {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* ===================================
   Buttons
   =================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-lg);
  font-size: 0.875rem;
  font-weight: 500;
  font-family: inherit;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.btn-icon {
  width: 18px;
  height: 18px;
}

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

.btn-primary:hover:not(:disabled) {
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.btn-primary:active:not(:disabled) {
  transform: translateY(0);
}

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

.btn-secondary:hover:not(:disabled) {
  background: var(--bg-card-hover);
  border-color: var(--border-color-light);
}

.btn-outline {
  background: transparent;
  color: var(--accent-primary);
  border: 1px solid var(--accent-primary);
}

.btn-outline:hover:not(:disabled) {
  background: rgba(99, 102, 241, 0.1);
}

/* ===================================
   Results
   =================================== */
.result-container {
  margin-top: var(--spacing-xl);
  padding: var(--spacing-lg);
  background: var(--success-bg);
  border: 1px solid var(--success-color);
  border-radius: var(--radius-lg);
  animation: slideIn var(--transition-normal);
}

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

.result-container h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--success-color);
  margin-bottom: var(--spacing-md);
}

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

.result-item {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.result-label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  min-width: 120px;
}

.result-value {
  font-size: 0.875rem;
  color: var(--text-primary);
  word-break: break-all;
}

.result-link {
  font-size: 0.875rem;
  color: var(--accent-primary);
  text-decoration: none;
  word-break: break-all;
}

.result-link:hover {
  text-decoration: underline;
  color: var(--accent-primary-hover);
}

/* ===================================
   Errors
   =================================== */
.error-container {
  margin-top: var(--spacing-xl);
  padding: var(--spacing-lg);
  background: var(--error-bg);
  border: 1px solid var(--error-color);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  animation: shake 0.5s ease;
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  10%, 30%, 50%, 70%, 90% { transform: translateX(-5px); }
  20%, 40%, 60%, 80% { transform: translateX(5px); }
}

.error-icon {
  width: 24px;
  height: 24px;
  color: var(--error-color);
  flex-shrink: 0;
}

.error-container span {
  font-size: 0.875rem;
  color: var(--error-color);
}

/* ===================================
   Quick Test Section
   =================================== */
.quick-test-section {
  margin-bottom: var(--spacing-2xl);
}

.quick-test-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-lg);
}

.quick-test-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--spacing-lg);
  text-align: center;
  transition: all var(--transition-normal);
}

.quick-test-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-color-light);
}

.quick-test-card h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

.quick-test-card p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-lg);
}

/* ===================================
   Footer
   =================================== */
.footer {
  text-align: center;
  padding: var(--spacing-xl) 0;
  border-top: 1px solid var(--border-color);
  margin-top: var(--spacing-2xl);
}

.footer p {
  font-size: 0.875rem;
  color: var(--text-muted);
}

/* ===================================
   Loading Overlay
   =================================== */
.loading-overlay {
  position: fixed;
  inset: 0;
  background: rgba(13, 13, 15, 0.9);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

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

.spinner {
  width: 48px;
  height: 48px;
  border: 3px solid var(--border-color);
  border-top-color: var(--accent-primary);
  border-radius: var(--radius-full);
  animation: spin 1s linear infinite;
  margin: 0 auto var(--spacing-lg);
}

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

.loading-spinner p {
  font-size: 1rem;
  color: var(--text-secondary);
}

/* ===================================
   Toast Notifications
   =================================== */
.toast-container {
  position: fixed;
  bottom: var(--spacing-lg);
  right: var(--spacing-lg);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  z-index: 1001;
}

.toast {
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 500;
  box-shadow: var(--shadow-lg);
  animation: toastIn 0.3s ease;
  max-width: 350px;
}

@keyframes toastIn {
  from {
    opacity: 0;
    transform: translateX(100%);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.toast.toast-exit {
  animation: toastOut 0.3s ease forwards;
}

@keyframes toastOut {
  to {
    opacity: 0;
    transform: translateX(100%);
  }
}

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

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

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

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

/* ===================================
   Hidden Utility
   =================================== */
[hidden] {
  display: none !important;
}

/* ===================================
   Responsive Design
   =================================== */
@media (max-width: 768px) {
  .app-container {
    padding: var(--spacing-md);
  }
  
  .logo h1 {
    font-size: 1.75rem;
  }
  
  .converters-grid {
    grid-template-columns: 1fr;
  }
  
  .status-cards {
    grid-template-columns: 1fr;
  }
  
  .quick-test-cards {
    grid-template-columns: 1fr;
  }
  
  .converter-section {
    padding: var(--spacing-lg);
  }
  
  .toast-container {
    left: var(--spacing-md);
    right: var(--spacing-md);
  }
  
  .toast {
    max-width: 100%;
  }
}

@media (max-width: 480px) {
  .header {
    padding: var(--spacing-xl) 0;
  }
  
  .logo {
    flex-direction: column;
    gap: var(--spacing-sm);
  }
  
  .logo-icon {
    width: 40px;
    height: 40px;
  }
  
  .logo h1 {
    font-size: 1.5rem;
  }
  
  .subtitle {
    font-size: 1rem;
  }
  
  .section-title {
    font-size: 1.25rem;
  }
}

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

/* Focus styles for keyboard navigation */
:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 2px;
}

/* Skip link for accessibility */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--accent-primary);
  color: white;
  padding: var(--spacing-sm) var(--spacing-md);
  z-index: 1002;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 0;
}