:root {
  --bg: #0f0f0f;
  --surface: #1a1a1a;
  --surface-hover: #252525;
  --ink: #ffffff;
  --ink-secondary: #a0a0a0;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --success: #22c55e;
  --warning: #f59e0b;
  --error: #ef4444;
  --line: #2a2a2a;
  --shadow: rgba(0, 0, 0, 0.3);
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
}

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

body {
  font-family: var(--font-sans);
  color: var(--ink);
  background: var(--bg);
  min-height: 100vh;
  line-height: 1.5;
}

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

/* Sidebar */
.sidebar {
  width: 240px;
  background: var(--surface);
  border-right: 1px solid var(--line);
  padding: 24px 16px;
  display: flex;
  flex-direction: column;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 12px 24px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 16px;
}

.brand-icon {
  font-size: 24px;
  color: var(--accent);
}

.brand-text {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.5px;
}

.nav {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  border-radius: 8px;
  color: var(--ink-secondary);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: all 0.15s ease;
}

.nav-item:hover {
  background: var(--surface-hover);
  color: var(--ink);
}

.nav-item.active {
  background: var(--accent);
  color: white;
}

.nav-item .icon {
  font-size: 18px;
}

/* Main Content */
.main {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 32px;
  border-bottom: 1px solid var(--line);
  background: var(--surface);
}

.topbar h1 {
  font-size: 24px;
  font-weight: 600;
}

.actions {
  display: flex;
  gap: 12px;
}

/* Buttons */
.btn {
  padding: 10px 20px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  border: none;
  transition: all 0.15s ease;
}

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

.btn-primary:hover {
  background: var(--accent-hover);
}

.btn-secondary {
  background: var(--surface-hover);
  color: var(--ink);
  border: 1px solid var(--line);
}

.btn-secondary:hover {
  background: var(--line);
}

/* Content Area */
.content {
  flex: 1;
  padding: 32px;
  overflow-y: auto;
}

/* Cards */
.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 24px;
}

.card h2 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 16px;
}

/* Grid */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

/* Stats */
.stat-value {
  font-size: 32px;
  font-weight: 700;
  color: var(--ink);
}

.stat-label {
  font-size: 14px;
  color: var(--ink-secondary);
  margin-top: 4px;
}

/* Status badges */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: 6px;
  font-size: 12px;
  font-weight: 500;
}

.badge-success {
  background: rgba(34, 197, 94, 0.15);
  color: var(--success);
}

.badge-warning {
  background: rgba(245, 158, 11, 0.15);
  color: var(--warning);
}

.badge-error {
  background: rgba(239, 68, 68, 0.15);
  color: var(--error);
}

/* Tables */
table {
  width: 100%;
  border-collapse: collapse;
}

thead {
  background: var(--surface-hover);
}

th, td {
  padding: 12px 16px;
  text-align: left;
  font-size: 14px;
}

th {
  font-weight: 500;
  color: var(--ink-secondary);
  text-transform: uppercase;
  font-size: 12px;
  letter-spacing: 0.5px;
}

tr {
  border-bottom: 1px solid var(--line);
}

tr:last-child {
  border-bottom: none;
}

/* Forms */
input, textarea, select {
  width: 100%;
  padding: 12px 16px;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--ink);
  font-size: 14px;
  font-family: inherit;
}

input:focus, textarea:focus, select:focus {
  outline: none;
  border-color: var(--accent);
}

label {
  display: block;
  font-size: 14px;
  font-weight: 500;
  margin-bottom: 8px;
  color: var(--ink-secondary);
}

.form-group {
  margin-bottom: 20px;
}

/* Utility */
.text-success { color: var(--success); }
.text-warning { color: var(--warning); }
.text-error { color: var(--error); }
.text-muted { color: var(--ink-secondary); }

.mt-4 { margin-top: 16px; }
.mb-4 { margin-bottom: 16px; }
.gap-4 { gap: 16px; }

.flex {
  display: flex;
}

.flex-col {
  flex-direction: column;
}

.items-center {
  align-items: center;
}

.justify-between {
  justify-content: space-between;
}