:root {
  --primary: #2d89ef;
  --secondary: #f4f6f8;
  --dark: #2c3e50;
  --light: #ffffff;
}

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

html, body {
  height: 100%;
  font-family: 'Segoe UI', sans-serif;
  background: var(--secondary);
  display: flex;
  justify-content: center;
  align-items: center;
}

.login-container {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100%;
  min-height: 100%;
}

.login-card {
  background: var(--light);
  padding: 40px;
  border-radius: 12px;
  box-shadow: 0 4px 15px rgba(0,0,0,0.15);
  text-align: center;
  width: 320px;
}

.login-card h2 {
  margin-bottom: 10px;
  color: var(--dark);
}

.login-card p {
  color: #555;
  margin-bottom: 20px;
}

.login-card .error {
  color: red;
  margin-bottom: 15px;
  font-size: 0.9rem;
}

.login-card input {
  width: 100%;
  padding: 12px;
  margin: 10px 0;
  border: 1px solid #ccc;
  border-radius: 6px;
  font-size: 1rem;
}

.login-card button {
  width: 100%;
  padding: 12px;
  background: var(--primary);
  border: none;
  border-radius: 6px;
  color: var(--light);
  font-size: 1rem;
  cursor: pointer;
  margin-top: 10px;
  transition: 0.2s;
}

.login-card button:hover {
  background: #1b5fb4;
}