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

/* Base Styles */
body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: #f4f6f9;
  color: #333;
  line-height: 1.6;
}

/* Container */
.container {
  max-width: 1200px;
  margin: auto;
  padding: 20px;
}

/* Header */
.header {
  background: #343a40;
  color: #fff;
  padding: 15px 30px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.header h1 {
  font-size: 24px;
}

.header a {
  color: #f8f9fa;
  text-decoration: none;
  margin-left: 20px;
}

/* Sidebar */
.sidebar {
  width: 220px;
  background-color: #212529;
  height: 100vh;
  position: fixed;
  top: 0;
  left: 0;
  padding-top: 60px;
}

.sidebar a {
  display: block;
  padding: 15px 20px;
  color: #adb5bd;
  text-decoration: none;
  border-bottom: 1px solid #343a40;
}

.sidebar a:hover,
.sidebar a.active {
  background-color: #495057;
  color: #fff;
}

/* Main */
.main {
  margin-left: 240px;
  padding: 30px;
}

/* Login Form */
.login-form {
  max-width: 400px;
  margin: 80px auto;
  padding: 30px;
  background: #fff;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
  border-radius: 8px;
}

.login-form h2 {
  margin-bottom: 20px;
  color: #333;
}

.login-form input {
  width: 100%;
  padding: 12px;
  margin: 10px 0;
  border: 1px solid #ccc;
  border-radius: 5px;
}

.login-form button {
  width: 100%;
  padding: 12px;
  background: #198754;
  border: none;
  color: white;
  font-weight: bold;
  border-radius: 5px;
  cursor: pointer;
}

.login-form button:hover {
  background: #157347;
}

.alert {
  padding: 10px;
  background-color: #dc3545;
  color: white;
  margin-bottom: 10px;
  border-radius: 5px;
}