:root {
  --bg-color: #121212;
  --card-bg: #1e1e1e;
  --text-main: #e0e0e0;
  --text-muted: #a0a0a0;
  --primary-color: #3b82f6;
  --primary-hover: #2563eb;
  --danger-color: #ef4444;
  --danger-hover: #dc2626;
  --success-color: #22c55e;
  --border-color: #333333;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-main);
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

*, *::before, *::after {
  box-sizing: inherit;
}

.bg-dark { background-color: var(--bg-color) !important; }
.bg-dark-card { background-color: var(--card-bg) !important; }
.text-light { color: var(--text-main) !important; }
.text-muted { color: var(--text-muted) !important; }
.text-center { text-align: center; }

.d-flex { display: flex; }
.align-items-center { align-items: center; }
.justify-content-between { justify-content: space-between; }
.min-vh-100 { min-height: 100vh; }

.container { margin-left: auto; margin-right: auto; }
.mx-auto { margin-left: auto; margin-right: auto; }
.p-4 { padding: 1.5rem; }
.p-2 { padding: 0.5rem; }
.py-2 { padding-top: 0.5rem; padding-bottom: 0.5rem; }
.px-4 { padding-left: 1.5rem; padding-right: 1.5rem; }
.mb-1 { margin-bottom: 0.25rem; }
.mb-3 { margin-bottom: 1rem; }
.mb-4 { margin-bottom: 1.5rem; }
.mt-4 { margin-top: 1.5rem; }
.ml-2 { margin-left: 0.5rem; }

.w-100 { width: 100%; }
.d-block { display: block; }
.d-inline-block { display: inline-block; }

.rounded { border-radius: 0.375rem; }
.shadow { box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06); }

.card {
  border: 1px solid var(--border-color);
}

.form-control {
  background-color: #2a2a2a;
  border: 1px solid var(--border-color);
  color: var(--text-main);
  outline: none;
}
.form-control:focus {
  border-color: var(--primary-color);
}

.btn {
  cursor: pointer;
  border: none;
  font-weight: 500;
  text-decoration: none;
  display: inline-block;
  text-align: center;
}
.btn-primary {
  background-color: var(--primary-color);
  color: white;
}
.btn-primary:hover { background-color: var(--primary-hover); }

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

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

.btn-secondary {
  background-color: #4b5563;
  color: white;
}
.btn-secondary:hover { background-color: #374151; }

.btn-sm {
  padding: 0.25rem 0.5rem;
  font-size: 0.875rem;
  border-radius: 0.2rem;
}

.alert { border: 1px solid transparent; }
.alert-danger {
  background-color: rgba(239, 68, 68, 0.1);
  border-color: rgba(239, 68, 68, 0.4);
  color: #fca5a5;
}
.alert-success {
  background-color: rgba(34, 197, 94, 0.1);
  border-color: rgba(34, 197, 94, 0.4);
  color: #86efac;
}

table {
  width: 100%;
  border-collapse: collapse;
}
th, td {
  padding: 0.75rem;
  border-bottom: 1px solid var(--border-color);
  text-align: left;
}
th { background-color: #2a2a2a; }

/* Navbar */
.navbar {
  background-color: var(--card-bg);
  border-bottom: 1px solid var(--border-color);
  padding: 1rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.navbar a { color: var(--text-main); text-decoration: none; }
.navbar a:hover { color: var(--primary-color); }