* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: Tahoma, Arial, sans-serif;
  background: #f4f6f9;
  color: #1f2937;
}

.layout {
  display: grid;
  grid-template-columns: 250px 1fr;
  min-height: 100vh;
}

.sidebar {
  background: #0f172a;
  color: #fff;
  padding: 20px;
}

.sidebar h2 {
  margin: 0 0 20px;
  font-size: 22px;
}

.sidebar nav {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.sidebar a {
  color: #e2e8f0;
  text-decoration: none;
  background: #1e293b;
  padding: 10px 12px;
  border-radius: 8px;
}

.sidebar a:hover {
  background: #334155;
}

.content {
  padding: 20px;
}

.topbar {
  background: #fff;
  border: 1px solid #e2e8f0;
  border-radius: 10px;
  padding: 12px 16px;
  display: flex;
  justify-content: space-between;
  margin-bottom: 20px;
}

.kpi-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 15px;
  margin-bottom: 20px;
}

.kpi-card {
  background: #fff;
  border: 1px solid #e2e8f0;
  border-radius: 10px;
  padding: 14px;
}

.kpi-card h3 {
  margin: 0 0 8px;
  font-size: 14px;
  color: #64748b;
}

.kpi-card p {
  margin: 0;
  font-size: 24px;
  font-weight: bold;
}

.panel {
  background: #fff;
  border: 1px solid #e2e8f0;
  border-radius: 10px;
  padding: 16px;
}

.panel h3 {
  margin: 0 0 12px;
}

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

th, td {
  border-bottom: 1px solid #e5e7eb;
  padding: 10px;
  text-align: right;
  font-size: 14px;
}

.login-page {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
}

.login-box {
  background: #fff;
  border: 1px solid #e5e7eb;
  border-radius: 10px;
  padding: 22px;
  width: 350px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.login-box h1 {
  margin: 0;
}

.login-box p {
  margin: 0 0 10px;
  color: #64748b;
}

.login-box input {
  width: 100%;
  border: 1px solid #cbd5e1;
  border-radius: 8px;
  padding: 10px;
}

.login-box button {
  border: 0;
  border-radius: 8px;
  background: #2563eb;
  color: #fff;
  padding: 10px;
  cursor: pointer;
}

.alert {
  background: #fee2e2;
  color: #991b1b;
  padding: 10px;
  border-radius: 8px;
}