:root {
  /* Colors - Deep Space / Cyberpunk Tech vibe */
  --bg-dark: #05070a;
  --bg-card: #0d1117;
  --bg-card-hover: #161b22;
  --accent-primary: #00f2ff; /* Electric Cyan */
  --accent-secondary: #7000ff; /* Neon Purple */
  --text-main: #e6edf3;
  --text-muted: #8b949e;
  --border-color: rgba(255, 255, 255, 0.1);
  --grid-color: rgba(0, 242, 255, 0.05);
  
  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 48px;
  --space-2xl: 80px;
  
  /* Effects */
  --glow: 0 0 15px rgba(0, 242, 255, 0.3);
  --glass: backdrop-filter: blur(10px);
}

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

body {
  background-color: var(--bg-dark);
  color: var(--text-main);
  font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.5;
  overflow-x: hidden;
  min-height: 100vh;
}

/* Grid Background Effect */
body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: 
    linear-gradient(var(--grid-color) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-color) 1px, transparent 1px);
  background-size: 50px 50px;
  z-index: -1;
  pointer-events: none;
}

/* Typography */
h1, h2, h3, h4 {
  font-weight: 700;
  letter-spacing: -0.02em;
  text-transform: uppercase;
}

.text-gradient {
  background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Layout */
.app-container {
  display: grid;
  grid-template-columns: 260px 1fr;
  min-height: 100vh;
}

/* Sidebar */
.sidebar {
  background: var(--bg-card);
  border-right: 1px solid var(--border-color);
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
}

.logo-area {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-weight: 800;
  font-size: 1.2rem;
  color: var(--accent-primary);
}

.nav-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md);
  text-decoration: none;
  color: var(--text-muted);
  border-radius: 8px;
  transition: all 0.2s ease;
  font-weight: 500;
}

.nav-link:hover, .nav-link.active {
  background: var(--bg-card-hover);
  color: var(--accent-primary);
  box-shadow: inset 2px 0 0 var(--accent-primary);
}

/* Main Content */
main {
  padding: var(--space-lg);
  max-width: 1600px;
  width: 100%;
  margin: 0 auto;
}

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

/* Cards & Components */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: var(--space-lg);
  position: relative;
  overflow: hidden;
}

.card-title {
  color: var(--text-muted);
  font-size: 0.8rem;
  margin-bottom: var(--space-sm);
}

.card-value {
  font-size: 2rem;
  font-weight: 700;
}

.card-trend {
  font-size: 0.85rem;
  margin-top: var(--space-sm);
  display: flex;
  align-items: center;
  gap: 4px;
}

.trend-up { color: #00ff88; }
.trend-down { color: #ff3366; }

/* Grid Systems */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-lg);
  margin-bottom: var(--space-lg);
}

.main-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: var(--space-lg);
}

/* Visual Elements */
.chart-placeholder {
  width: 100%;
  height: 300px;
  background: linear-gradient(transparent, rgba(0, 242, 255, 0.05));
  border-bottom: 2px solid var(--accent-primary);
  position: relative;
  display: flex;
  align-items: flex-end;
  padding: 20px;
  gap: 10px;
}

.chart-bar {
  flex: 1;
  background: linear-gradient(to top, var(--accent-primary), var(--accent-secondary));
  opacity: 0.6;
  border-radius: 4px 4px 0 0;
  transition: opacity 0.3s;
}

.chart-bar:hover {
  opacity: 1;
  box-shadow: 0 0 20px rgba(0, 242, 255, 0.4);
}

/* Buttons */
.btn {
  padding: 10px 20px;
  border-radius: 6px;
  border: none;
  cursor: pointer;
  font-weight: 600;
  transition: all 0.2s;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.btn-primary {
  background: var(--accent-primary);
  color: var(--bg-dark);
}

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

.btn:hover {
  transform: translateY(-2px);
  filter: brightness(1.1);
}

/* Table */
.table-container {
  width: 100%;
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin-top: var(--space-md);
}

th {
  text-align: left;
  padding: var(--space-md);
  color: var(--text-muted);
  font-size: 0.8rem;
  border-bottom: 1px solid var(--border-color);
}

td {
  padding: var(--space-md);
  border-bottom: 1px solid var(--border-color);
}

.badge {
  padding: 4px 8px;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 600;
  background: rgba(255, 255, 255, 0.1);
}

.badge-active { background: rgba(0, 255, 136, 0.2); color: #00ff88; }

/* Mobile Specifics */
.mobile-view {
  max-width: 480px;
  margin: 0 auto;
  border-left: 1px solid var(--border-color);
  border-right: 1px solid var(--border-color);
  min-height: 100vh;
  position: relative;
  background: var(--bg-dark);
}

.mobile-header {
  padding: var(--space-lg);
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: sticky;
  top: 0;
  background: rgba(5, 7, 10, 0.8);
  backdrop-filter: blur(10px);
  z-index: 100;
  border-bottom: 1px solid var(--border-color);
}

.list-container {
  padding: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.list-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: var(--space-md);
  display: flex;
  align-items: center;
  gap: var(--space-md);
  transition: transform 0.2s, background 0.2s;
  animation: slideIn 0.3s ease-out forwards;
}

.list-item:hover {
  background: var(--bg-card-hover);
}

.item-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  flex-shrink: 0;
}

.item-content {
  flex-grow: 1;
}

.item-title {
  font-weight: 600;
  font-size: 1rem;
  margin-bottom: 2px;
}

.item-subtitle {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.item-actions {
  display: flex;
  gap: var(--space-sm);
}

.btn-icon {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.2s;
}

.btn-icon:hover {
  background: rgba(255, 51, 102, 0.1);
  color: #ff3366;
  border-color: rgba(255, 51, 102, 0.3);
}

.fab {
  position: fixed;
  bottom: var(--space-xl);
  right: calc(50% - 220px);
  width: 60px;
  height: 60px;
  border-radius: 30px;
  background: var(--accent-primary);
  color: var(--bg-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 10px 30px rgba(0, 242, 255, 0.3);
  cursor: pointer;
  z-index: 100;
  transition: transform 0.2s;
  text-decoration: none;
}

@media (max-width: 480px) {
  .fab {
    right: 24px;
  }
}

.fab:hover {
  transform: scale(1.1) rotate(90deg);
}

.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-2xl) var(--space-lg);
  text-align: center;
  color: var(--text-muted);
}

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

/* Modal Overlay (Static Wireframe State) */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-lg);
  z-index: 1000;
}

.modal {
  background: var(--bg-card);
  border: 1px solid var(--accent-primary);
  border-radius: 20px;
  padding: var(--space-lg);
  width: 100%;
  max-width: 400px;
}

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

.form-label {
  display: block;
  margin-bottom: var(--space-sm);
  font-size: 0.8rem;
  color: var(--accent-primary);
}

.form-input {
  width: 100%;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  padding: 12px;
  border-radius: 8px;
  color: white;
  font-family: inherit;
}

/* Responsive adjustments */
@media (max-width: 1100px) {
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .main-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .app-container { grid-template-columns: 1fr; }
  .sidebar { display: none; }
  .stats-grid { grid-template-columns: 1fr; }
}