/* =================================
   MODERN UI VARIABLES & RESET
   ================================= */

:root {
  /* Colors */
  --color-primary: #0066FF;
  --color-primary-hover: #0052CC;
  --color-background: #FFFFFF;
  --color-surface: #F8F9FA;
  --color-surface-hover: #F1F3F5;
  --color-text: #1A1A1A;
  --color-text-secondary: #6B7280;
  --color-text-muted: #9CA3AF;
  --color-border: #E5E7EB;
  --color-border-light: #F3F4F6;
  
  /* Status Colors */
  --color-success: #10B981;
  --color-warning: #F59E0B;
  --color-error: #EF4444;
  --color-info: #3B82F6;
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  
  /* Typography */
  --font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  
  /* Layout */
  --border-radius: 8px;
  --border-radius-sm: 4px;
  --border-radius-lg: 12px;
  --border-radius-xl: 16px;
  --border-width: 1px;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-base: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px 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);
  
  /* Transitions */
  --transition: all 0.2s ease;
  --transition-fast: all 0.15s ease;
  --transition-slow: all 0.3s ease;
  
  /* Z-index */
  --z-dropdown: 50;
  --z-modal: 100;
  --z-toast: 200;
}

/* Dark Theme */
[data-theme="dark"] {
  --color-background: #0A0A0A;
  --color-surface: #1A1A1A;
  --color-surface-hover: #2A2A2A;
  --color-text: #FFFFFF;
  --color-text-secondary: #A3A3A3;
  --color-text-muted: #6B7280;
  --color-border: #374151;
  --color-border-light: #2D3748;
  
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-base: 0 1px 3px 0 rgba(0, 0, 0, 0.4), 0 1px 2px 0 rgba(0, 0, 0, 0.2);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -1px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -2px rgba(0, 0, 0, 0.2);
}

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

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

body {
  font-family: var(--font-family);
  color: var(--color-text);
  background-color: var(--color-background);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: var(--transition);
}

/* =================================
   LAYOUT COMPONENTS
   ================================= */

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.header {
  background: var(--color-background);
  border-bottom: var(--border-width) solid var(--color-border-light);
  padding: var(--spacing-md) 0;
  position: sticky;
  top: 0;
  z-index: var(--z-dropdown);
  backdrop-filter: blur(10px);
  transition: var(--transition);
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-text);
  text-decoration: none;
  transition: var(--transition);
}

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

.nav {
  display: flex;
  gap: var(--spacing-lg);
  align-items: center;
}

.nav-link {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-weight: 500;
  transition: var(--transition);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--border-radius-sm);
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-primary);
  background: rgba(0, 102, 255, 0.1);
}

.theme-toggle {
  background: none;
  border: var(--border-width) solid var(--color-border);
  padding: var(--spacing-sm);
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
}

.theme-toggle:hover {
  background: var(--color-surface-hover);
  border-color: var(--color-primary);
}

.main {
  padding: var(--spacing-2xl) 0;
  min-height: calc(100vh - 80px);
}

/* =================================
   CARD SYSTEM
   ================================= */

.card {
  background: var(--color-surface);
  border: var(--border-width) solid var(--color-border-light);
  border-radius: var(--border-radius);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

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

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-lg);
}

.card-title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--color-text);
  margin: 0;
}

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

.card-actions {
  display: flex;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-lg);
}

/* =================================
   GRID SYSTEM
   ================================= */

.grid {
  display: grid;
  gap: var(--spacing-lg);
}

.grid-cols-1 { grid-template-columns: repeat(1, 1fr); }
.grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid-cols-4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 768px) {
  .grid-cols-2,
  .grid-cols-3,
  .grid-cols-4 {
    grid-template-columns: 1fr;
  }
}

/* =================================
   STATISTICS CARDS
   ================================= */

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-2xl);
}

.stat-card {
  background: var(--color-surface);
  border: var(--border-width) solid var(--color-border-light);
  border-radius: var(--border-radius);
  padding: var(--spacing-lg);
  text-align: center;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.stat-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-info));
  opacity: 0;
  transition: var(--transition);
}

.stat-card:hover::before {
  opacity: 1;
}

.stat-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.stat-icon {
  font-size: var(--font-size-3xl);
  margin-bottom: var(--spacing-sm);
  display: block;
}

.stat-value {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--spacing-xs);
}

.stat-label {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-xs);
}

.stat-trend {
  font-size: var(--font-size-xs);
  font-weight: 500;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--border-radius-sm);
  display: inline-block;
}

.stat-trend.positive {
  color: var(--color-success);
  background: rgba(16, 185, 129, 0.1);
}

.stat-trend.negative {
  color: var(--color-error);
  background: rgba(239, 68, 68, 0.1);
}

/* =================================
   STATUS INDICATORS
   ================================= */

.status-indicator {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: var(--font-size-sm);
  font-weight: 500;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--border-radius-sm);
}

.status-indicator.success {
  color: var(--color-success);
  background: rgba(16, 185, 129, 0.1);
}

.status-indicator.warning {
  color: var(--color-warning);
  background: rgba(245, 158, 11, 0.1);
}

.status-indicator.error {
  color: var(--color-error);
  background: rgba(239, 68, 68, 0.1);
}

.status-indicator.info {
  color: var(--color-info);
  background: rgba(59, 130, 246, 0.1);
}

.pulse {
  position: relative;
}

.pulse::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 8px;
  height: 8px;
  background: currentColor;
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { transform: translate(-50%, -50%) scale(0.8); opacity: 1; }
  50% { transform: translate(-50%, -50%) scale(1.2); opacity: 0.7; }
  100% { transform: translate(-50%, -50%) scale(0.8); opacity: 1; }
}

/* =================================
   BUTTONS
   ================================= */

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--border-radius);
  border: none;
  font-family: inherit;
  font-size: var(--font-size-sm);
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  transition: width 0.3s ease, height 0.3s ease;
}

.btn:hover::before {
  width: 300px;
  height: 300px;
}

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

.btn-primary:hover {
  background: var(--color-primary-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background: var(--color-surface);
  color: var(--color-text);
  border: var(--border-width) solid var(--color-border);
}

.btn-secondary:hover {
  background: var(--color-surface-hover);
  border-color: var(--color-primary);
  transform: translateY(-2px);
}

.btn-ghost {
  background: transparent;
  color: var(--color-text-secondary);
}

.btn-ghost:hover {
  background: var(--color-surface-hover);
  color: var(--color-text);
}

.btn-sm {
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: var(--font-size-xs);
}

.btn-lg {
  padding: var(--spacing-md) var(--spacing-lg);
  font-size: var(--font-size-lg);
}

/* =================================
   FORMS
   ================================= */

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

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

.form-input {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--border-radius);
  font-family: inherit;
  font-size: var(--font-size-base);
  background: var(--color-background);
  color: var(--color-text);
  transition: var(--transition);
}

.form-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(0, 102, 255, 0.1);
}

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

/* =================================
   TABLES
   ================================= */

.table-container {
  background: var(--color-surface);
  border-radius: var(--border-radius);
  border: var(--border-width) solid var(--color-border-light);
  overflow: hidden;
}

.table {
  width: 100%;
  border-collapse: collapse;
}

.table th,
.table td {
  padding: var(--spacing-md);
  text-align: left;
  border-bottom: var(--border-width) solid var(--color-border-light);
}

.table th {
  background: var(--color-background);
  font-weight: 600;
  color: var(--color-text);
  font-size: var(--font-size-sm);
}

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

.table tbody tr:hover {
  background: var(--color-surface-hover);
}

.table tbody tr:last-child td {
  border-bottom: none;
}

/* =================================
   TIMELINE
   ================================= */

.timeline {
  position: relative;
  padding-left: var(--spacing-lg);
}

.timeline::before {
  content: '';
  position: absolute;
  left: 8px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--color-border);
}

.timeline-item {
  position: relative;
  padding-bottom: var(--spacing-lg);
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -12px;
  top: 6px;
  width: 12px;
  height: 12px;
  background: var(--color-primary);
  border-radius: 50%;
  border: 3px solid var(--color-background);
}

.timeline-content {
  background: var(--color-surface);
  border: var(--border-width) solid var(--color-border-light);
  border-radius: var(--border-radius);
  padding: var(--spacing-md);
  margin-left: var(--spacing-md);
}

.timeline-title {
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--spacing-xs);
}

.timeline-meta {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

/* =================================
   LOADING STATES
   ================================= */

.skeleton {
  background: linear-gradient(90deg, var(--color-border-light) 25%, var(--color-surface) 50%, var(--color-border-light) 75%);
  background-size: 200% 100%;
  animation: skeleton-loading 1.5s infinite;
}

@keyframes skeleton-loading {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

.skeleton-text {
  height: 1em;
  border-radius: var(--border-radius-sm);
  margin-bottom: var(--spacing-sm);
}

.skeleton-text:last-child {
  margin-bottom: 0;
}

/* =================================
   RESPONSIVE DESIGN
   ================================= */

@media (max-width: 1024px) {
  .lg\:col-span-2 {
    grid-column: span 1;
  }
  
  .lg\:grid-cols-2 {
    grid-template-columns: 1fr;
  }
  
  .lg\:grid-cols-3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .container {
    padding: 0 var(--spacing-sm);
  }
  
  .header-content {
    flex-direction: column;
    gap: var(--spacing-md);
  }
  
  .nav {
    flex-direction: column;
    gap: var(--spacing-sm);
  }
  
  .main {
    padding: var(--spacing-lg) 0;
  }
  
  .card {
    padding: var(--spacing-md);
  }
  
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .md\:grid-cols-2 {
    grid-template-columns: 1fr;
  }
  
  .md\:grid-cols-3 {
    grid-template-columns: 1fr;
  }
  
  .md\:grid-cols-4 {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .md\:grid-cols-5 {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .flex {
    flex-direction: column;
  }
  
  .text-3xl {
    font-size: 1.875rem;
  }
  
  .gap-4 {
    gap: var(--spacing-md);
  }
  
  .items-center {
    align-items: stretch;
  }
  
  .justify-between {
    justify-content: flex-start;
  }
  
  .card-header .flex {
    flex-direction: row;
    align-items: center;
  }
  
  .log-header {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .log-timestamp {
    margin-top: var(--spacing-xs);
  }
}

@media (max-width: 480px) {
  .stats-grid {
    grid-template-columns: 1fr;
  }
  
  .md\:grid-cols-4 {
    grid-template-columns: 1fr;
  }
  
  .md\:grid-cols-5 {
    grid-template-columns: 1fr;
  }
  
  .text-2xl {
    font-size: 1.5rem;
  }
  
  .text-3xl {
    font-size: 1.75rem;
  }
  
  .card-header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-sm);
  }
  
  .btn {
    width: 100%;
    justify-content: center;
  }
  
  .log-entry {
    flex-direction: column;
    gap: var(--spacing-sm);
  }
  
  .log-icon {
    align-self: flex-start;
  }
}

/* =================================
   ADDITIONAL UTILITY CLASSES
   ================================= */

/* Status colors with backgrounds */
:root {
  --color-success-bg: rgba(16, 185, 129, 0.1);
  --color-success-border: rgba(16, 185, 129, 0.2);
  --color-warning-bg: rgba(245, 158, 11, 0.1);
  --color-warning-border: rgba(245, 158, 11, 0.2);
  --color-error-bg: rgba(239, 68, 68, 0.1);
  --color-error-border: rgba(239, 68, 68, 0.2);
  --color-info-bg: rgba(59, 130, 246, 0.1);
  --color-info-border: rgba(59, 130, 246, 0.2);
  --color-primary-bg: rgba(0, 102, 255, 0.1);
  --color-primary-border: rgba(0, 102, 255, 0.2);
}

/* Text colors */
.text-success { color: var(--color-success); }
.text-warning { color: var(--color-warning); }
.text-error { color: var(--color-error); }
.text-info { color: var(--color-info); }
.text-primary { color: var(--color-primary); }
.text-secondary { color: var(--color-text-secondary); }
.text-muted { color: var(--color-text-muted); }

/* Background colors */
.bg-surface { background-color: var(--color-surface); }
.bg-surface-hover { background-color: var(--color-surface-hover); }

/* Border utilities */
.border { border: var(--border-width) solid var(--color-border); }
.border-light { border: var(--border-width) solid var(--color-border-light); }
.rounded { border-radius: var(--border-radius); }
.rounded-sm { border-radius: var(--border-radius-sm); }

/* Opacity utilities */
.opacity-30 { opacity: 0.3; }

/* Hover effects */
.hover\:bg-surface-hover:hover { background-color: var(--color-surface-hover); }

/* Transition utilities */
.transition-colors { transition: color 0.2s ease, background-color 0.2s ease; }

/* =================================
   ANIMATIONS
   ================================= */

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

@keyframes slideIn {
  from { transform: translateX(-100%); }
  to { transform: translateX(0); }
}

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

.animate-slide-in {
  animation: slideIn 0.3s ease-out;
}

/* =================================
   UTILITIES
   ================================= */

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

.font-bold { font-weight: 700; }
.font-semibold { font-weight: 600; }
.font-medium { font-weight: 500; }

.text-xs { font-size: var(--font-size-xs); }
.text-sm { font-size: var(--font-size-sm); }
.text-base { font-size: var(--font-size-base); }
.text-lg { font-size: var(--font-size-lg); }
.text-xl { font-size: var(--font-size-xl); }

.text-primary { color: var(--color-primary); }
.text-secondary { color: var(--color-text-secondary); }
.text-muted { color: var(--color-text-muted); }
.text-success { color: var(--color-success); }
.text-warning { color: var(--color-warning); }
.text-error { color: var(--color-error); }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--spacing-xs); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing-md); }
.mb-4 { margin-bottom: var(--spacing-lg); }
.mb-5 { margin-bottom: var(--spacing-xl); }

.hidden { display: none; }
.block { display: block; }
.inline-block { display: inline-block; }
.flex { display: flex; }
.inline-flex { display: inline-flex; }
.grid { display: grid; }

.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.items-end { align-items: flex-end; }

.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-end { justify-content: flex-end; }

.gap-1 { gap: var(--spacing-xs); }
.gap-2 { gap: var(--spacing-sm); }
.gap-3 { gap: var(--spacing-md); }
.gap-4 { gap: var(--spacing-lg); }

.w-full { width: 100%; }
.h-full { height: 100%; }

.rounded { border-radius: var(--border-radius); }
.rounded-sm { border-radius: var(--border-radius-sm); }
.rounded-lg { border-radius: var(--border-radius-lg); }

.shadow-sm { box-shadow: var(--shadow-sm); }
.shadow { box-shadow: var(--shadow-base); }
.shadow-md { box-shadow: var(--shadow-md); }
.shadow-lg { box-shadow: var(--shadow-lg); }

/* =================================
   PREFERS REDUCED MOTION
   ================================= */

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