:root {
  --bg-primary: #121212;
  --bg-secondary: #1e1e1e;
  --bg-card: #252526;
  --text-primary: #e0e0e0;
  --text-secondary: #a0a0a0;
  --accent-color: #007acc;
  --accent-hover: #0098ff;
  --danger: #d32f2f;
  --success: #388e3c;
  --border-color: #333333;
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
}

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

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-family);
  -webkit-font-smoothing: antialiased;
  line-height: 1.5;
}

h1, h2, h3, h4 {
  font-weight: 600;
  color: #ffffff;
}

a {
  color: var(--accent-color);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

button {
  cursor: pointer;
  font-family: inherit;
  border: none;
  background: var(--accent-color);
  color: #fff;
  padding: 0.5rem 1rem;
  border-radius: 4px;
  font-size: 0.9rem;
  font-weight: 500;
  transition: background 0.2s;
}

button:hover {
  background: var(--accent-hover);
}

button.secondary {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-primary);
}

button.secondary:hover {
  background: var(--bg-secondary);
}

button.danger {
  background: var(--danger);
}

button.danger:hover {
  background: #f44336;
}

input, select {
  width: 100%;
  padding: 0.6rem;
  margin-bottom: 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  border-radius: 4px;
  font-family: inherit;
}

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

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

.sidebar {
  width: 250px;
  background-color: var(--bg-secondary);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
}

.sidebar-header {
  padding: 1.5rem;
  font-size: 1.25rem;
  font-weight: 700;
  border-bottom: 1px solid var(--border-color);
  color: #fff;
}

.sidebar-nav {
  display: flex;
  flex-direction: column;
  padding: 1rem 0;
  flex: 1;
}

.nav-item {
  padding: 0.75rem 1.5rem;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
}

.nav-item:hover, .nav-item.active {
  background-color: var(--bg-card);
  color: var(--text-primary);
  text-decoration: none;
}

.sidebar-footer {
  padding: 1rem;
  border-top: 1px solid var(--border-color);
}

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

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

/* Cards & Tables */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}

.dashboard-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.stat-card {
  text-align: center;
}

.stat-card h3 {
  color: var(--text-secondary);
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 0.5rem;
}

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

.stat-card .value.income { color: var(--success); }
.stat-card .value.expense { color: var(--danger); }

table {
  width: 100%;
  border-collapse: collapse;
}

th, td {
  padding: 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}

th {
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.85rem;
  text-transform: uppercase;
}

tr:hover {
  background-color: rgba(255, 255, 255, 0.02);
}

/* Auth Pages */
.auth-container {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  background: var(--bg-primary);
}

.auth-box {
  background: var(--bg-card);
  padding: 2.5rem;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  width: 100%;
  max-width: 400px;
}

.auth-box h2 {
  margin-bottom: 1.5rem;
  text-align: center;
}

.auth-box form {
  display: flex;
  flex-direction: column;
}

.auth-box .toggle-link {
  margin-top: 1rem;
  text-align: center;
  font-size: 0.9rem;
}

.form-group {
  margin-bottom: 1rem;
}
.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  color: var(--text-secondary);
  font-size: 0.85rem;
}