:root {
  --primary: #6366f1;
  --primary-hover: #4f46e5;
  --secondary: #64748b;
  --bg-dark: #0f172a;
  --bg-card: rgba(30, 41, 59, 0.7);
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --accent: #22d3ee;
  --success: #10b981;
  --danger: #ef4444;
  --warning: #f59e0b;
  --glass-border: rgba(255, 255, 255, 0.1);
  --shadow:
    0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family:
    "Inter",
    system-ui,
    -apple-system,
    sans-serif;
}

body {
  background-color: var(--bg-dark);
  color: var(--text-main);
  min-height: 100vh;
  overflow-x: hidden;
}

/* Glassmorphism utility */
.glass {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  box-shadow: var(--shadow);
}

/* Layout */
.app-container {
  display: flex;
  min-height: 100vh;
}

/* Sidebar */
.sidebar {
  width: 260px;
  padding: 2rem;
  display: flex;
  flex-direction: column;
  gap: 2rem;
  transition: all 0.3s ease;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--primary);
  text-decoration: none;
}

.nav-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.nav-item {
  padding: 0.75rem 1rem;
  border-radius: 12px;
  color: var(--text-muted);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  transition: all 0.2s ease;
}

.nav-item:hover,
.nav-item.active {
  background: var(--primary);
  color: white;
}

/* Main Content */
.main-content {
  flex: 1;
  padding: 2rem;
  overflow-y: auto;
}

.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
}

.user-profile {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.5rem 1rem;
  border-radius: 50px;
}

/* Cards & Grid */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.stat-card {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

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

.stat-label {
  color: var(--text-muted);
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Charts Placeholder */
.charts-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 1.5rem;
}

.chart-container {
  padding: 1.5rem;
  min-height: 400px;
}

/* Buttons */
.btn {
  padding: 0.75rem 1.5rem;
  border-radius: 10px;
  border: none;
  cursor: pointer;
  font-weight: 600;
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

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

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

/* Inputs */
.input-group {
  margin-bottom: 1.5rem;
}

.input-group label {
  display: block;
  margin-bottom: 0.5rem;
  color: var(--text-muted);
}

.input-control {
  width: 100%;
  padding: 0.75rem 1rem;
  border-radius: 10px;
  background: rgba(15, 23, 42, 0.5);
  border: 1px solid var(--glass-border);
  color: white;
  outline: none;
}

.input-control:focus {
  border-color: var(--primary);
}

/* Animations */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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