body { font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; margin: 0; display: flex; height: 100vh; background: #f4f6f9; }
.sidebar { width: 250px; background: #2c3e50; color: #fff; display: flex; flex-direction: column; }
.sidebar .logo { padding: 20px; font-size: 24px; font-weight: bold; background: #1a252f; text-align: center; }
.sidebar ul { list-style: none; padding: 0; margin: 0; }
.sidebar ul li a { display: block; padding: 15px 20px; color: #b8c7ce; text-decoration: none; border-bottom: 1px solid #34495e; }
.sidebar ul li a:hover { background: #34495e; color: #fff; }
.main { flex: 1; display: flex; flex-direction: column; overflow-y: auto; }
.header { background: #fff; padding: 15px 30px; border-bottom: 1px solid #d2d6de; display: flex; justify-content: space-between; align-items: center; }
.content { padding: 30px; }
.card { background: #fff; padding: 20px; border-radius: 5px; box-shadow: 0 2px 5px rgba(0,0,0,0.05); margin-bottom: 20px; }
.auth-container { width: 100%; height: 100vh; display: flex; justify-content: center; align-items: center; background: #e9ecef; }
.auth-box { background: #fff; padding: 40px; border-radius: 8px; box-shadow: 0 4px 10px rgba(0,0,0,0.1); width: 400px; }
.form-group { margin-bottom: 15px; }
.form-group label { display: block; margin-bottom: 5px; font-weight: 600; }
.form-group input { width: 100%; padding: 10px; border: 1px solid #ddd; border-radius: 4px; box-sizing: border-box; }
.btn { width: 100%; padding: 10px; background: #3498db; color: white; border: none; border-radius: 4px; cursor: pointer; font-size: 16px; }
.btn:hover { background: #2980b9; }
.error { color: red; margin-bottom: 10px; font-size: 14px; }