:root {
  --primary: #4F46E5;
  --primary-hover: #4338CA;
  --secondary: #10B981;
  --secondary-hover: #059669;
  --danger: #EF4444;
  --danger-hover: #DC2626;
  --background: #F3F4F6;
  --surface: #FFFFFF;
  --text-main: #1F2937;
  --text-muted: #6B7280;
  --border: #E5E7EB;
  --radius-md: 12px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --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);
  --glass-bg: rgba(255, 255, 255, 0.7);
  --glass-border: rgba(255, 255, 255, 0.5);
}

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

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background-color: var(--background);
  color: var(--text-main);
  background-image: 
    radial-gradient(at 0% 0%, hsla(253,16%,7%,0.03) 0, transparent 50%), 
    radial-gradient(at 50% 0%, hsla(225,39%,30%,0.03) 0, transparent 50%), 
    radial-gradient(at 100% 0%, hsla(339,49%,30%,0.03) 0, transparent 50%);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Typography */
h1, h2, h3, h4, h5 {
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 1rem;
}
p { margin-bottom: 1rem; }

/* Layout */
.navbar {
  background: var(--surface);
  box-shadow: var(--shadow-sm);
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 100;
}

.navbar-brand {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--primary);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-links {
  display: flex;
  gap: 1.5rem;
}

.nav-link {
  text-decoration: none;
  color: var(--text-muted);
  font-weight: 500;
  transition: all 0.2s ease;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-md);
}

.nav-link:hover, .nav-link.active {
  color: var(--primary);
  background-color: rgba(79, 70, 229, 0.1);
}

.container {
  max-width: 1200px;
  margin: 2rem auto;
  padding: 0 1.5rem;
  flex: 1;
  width: 100%;
}

/* Cards & Glassmorphism */
.glass-card {
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-lg);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

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

.form-label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text-main);
  font-size: 0.9rem;
}

.form-control, .form-select {
  width: 100%;
  padding: 0.75rem 1rem;
  font-size: 1rem;
  font-family: 'Inter', sans-serif;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background-color: var(--surface);
  color: var(--text-main);
  transition: all 0.3s ease;
}

.form-control:focus, .form-select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(79, 70, 229, 0.1);
}

.form-row {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.form-col {
  flex: 1;
  min-width: 200px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
  font-weight: 600;
  font-family: inherit;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.2s ease;
  text-decoration: none;
}

.btn-primary {
  background-color: var(--primary);
  color: white;
  box-shadow: 0 4px 6px rgba(79, 70, 229, 0.25);
}
.btn-primary:hover {
  background-color: var(--primary-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 10px rgba(79, 70, 229, 0.3);
}

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

.btn-danger {
  background-color: transparent;
  color: var(--danger);
  border: 1px solid var(--danger);
}
.btn-danger:hover {
  background-color: var(--danger);
  color: white;
}

.btn-icon {
  padding: 0.5rem;
  border-radius: 50%;
  aspect-ratio: 1;
}

/* Tables */
.table-container {
  overflow-x: auto;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: var(--surface);
}

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

.table th, .table td {
  padding: 1rem;
  border-bottom: 1px solid var(--border);
}

.table th {
  font-weight: 600;
  color: var(--text-muted);
  background-color: rgba(249, 250, 251, 0.5);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.table tbody tr {
  transition: background-color 0.2s ease;
}

.table tbody tr:hover {
  background-color: rgba(249, 250, 251, 0.8);
}

/* Summary boxes */
.summary-box {
  background: linear-gradient(135deg, var(--primary), var(--primary-hover));
  color: white;
  padding: 1.5rem;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.summary-box h3 {
  color: rgba(255, 255, 255, 0.9);
  font-size: 1rem;
  font-weight: 500;
  margin-bottom: 0.5rem;
}

.summary-box .amount {
  font-size: 2.25rem;
  font-weight: 800;
}

/* Utilities */
.text-right { text-align: right; }
.text-center { text-align: center; }
.mt-1 { margin-top: 0.25rem; }
.mt-2 { margin-top: 0.5rem; }
.mt-4 { margin-top: 1rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-4 { margin-bottom: 1rem; }
.mb-6 { margin-bottom: 1.5rem; }
.d-flex { display: flex; }
.align-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: 0.5rem; }
.gap-4 { gap: 1rem; }

/* Grid for dashboard */
.grid {
  display: grid;
  gap: 1.5rem;
}
.grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid-cols-3 { grid-template-columns: repeat(3, 1fr); }

@media (max-width: 768px) {
  .grid-cols-2, .grid-cols-3 { grid-template-columns: 1fr; }
  .form-row { flex-direction: column; gap: 0; }
  .nav-links { display: none; /* simple mobile nav could be added */ }
}