body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f4f7f6;
    margin: 0;
    padding: 0;
    color: #333;
}

header {
    background-color: #ffffff;
    border-bottom: 1px solid #e0e0e0;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: #2c3e50;
    text-decoration: none;
}

nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    gap: 1.5rem;
}

nav a {
    text-decoration: none;
    color: #555;
    font-weight: 500;
}

nav a:hover {
    color: #007bff;
}

.user-info {
    font-size: 0.9rem;
    color: #777;
}

.container {
    max-width: 1000px;
    margin: 2rem auto;
    padding: 0 1rem;
}

h1, h2 {
    color: #2c3e50;
}

/* Forms */
.form-group {
    margin-bottom: 1rem;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

input[type="text"],
input[type="password"],
input[type="email"],
select {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #ccc;
    border-radius: 4px;
    font-size: 1rem;
}

button {
    background-color: #007bff;
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
}

button:hover {
    background-color: #0056b3;
}

/* Table */
table {
    width: 100%;
    border-collapse: collapse;
    background-color: white;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    border-radius: 4px;
    overflow: hidden;
}

th, td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid #eee;
}

th {
    background-color: #f8f9fa;
    font-weight: 600;
    color: #555;
}

tr:hover {
    background-color: #f1f1f1;
}

/* Login */
.login-container {
    max-width: 400px;
    margin: 5rem auto;
    background: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.alert {
    padding: 1rem;
    margin-bottom: 1rem;
    border-radius: 4px;
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}