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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    background-color: #f4f7f6;
    color: #333;
    padding: 20px;
}

/* Navigation Bar */
.nav-bar {
    background: linear-gradient(135deg, #6a11cb 0%, #2575fc 100%);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 20px;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    margin-bottom: 20px;
}

.nav-bar a {
    color: white;
    text-decoration: none;
    padding: 10px 15px;
    border-radius: 5px;
    transition: background-color 0.3s ease;
    font-weight: 500;
}

.nav-bar a:hover {
    background-color: rgba(255, 255, 255, 0.2);
}

.user-info {
    color: white;
    font-size: 0.9em;
}

/* Headings */
h1, h2 {
    color: #2575fc;
    margin-bottom: 20px;
    text-align: center;
    border-bottom: 3px solid #6a11cb;
    padding-bottom: 10px;
}

/* Forms */
form {
    background-color: white;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    max-width: 500px;
    margin: 0 auto;
}

input[type="text"], 
input[type="password"], 
input[type="file"], 
select {
    width: 100%;
    padding: 10px;
    margin: 10px 0;
    border: 1px solid #ddd;
    border-radius: 5px;
    transition: border-color 0.3s ease;
}

input[type="text"]:focus, 
input[type="password"]:focus, 
input[type="file"]:focus, 
select:focus {
    outline: none;
    border-color: #2575fc;
}

input[type="submit"] {
    background: linear-gradient(135deg, #6a11cb 0%, #2575fc 100%);
    color: white;
    border: none;
    padding: 12px 20px;
    border-radius: 5px;
    cursor: pointer;
    transition: transform 0.3s ease;
}

input[type="submit"]:hover {
    transform: scale(1.05);
}

/* Tables */
table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    margin-bottom: 30px;
    background-color: white;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    border-radius: 10px;
    overflow: hidden;
}

th, td {
    padding: 12px;
    text-align: center;
    border-bottom: 1px solid #ddd;
}

th {
    background: linear-gradient(135deg, #6a11cb 0%, #2575fc 100%);
    color: white;
    font-weight: 600;
}

tr:nth-child(even) {
    background-color: #f9f9f9;
}

tr:hover {
    background-color: #f5f5f5;
}

/* Notes and Messages */
.note, .error-message {
    background-color: #e7f3fe;
    border-left: 6px solid #2196F3;
    padding: 15px;
    margin: 20px 0;
    border-radius: 5px;
}

.error-message {
    background-color: #ffdddd;
    border-left-color: #f44336;
    color: #f44336;
}

/* Responsive Design */
@media screen and (max-width: 600px) {
    .nav-bar {
        flex-direction: column;
        align-items: stretch;
    }

    .nav-bar a {
        text-align: center;
        margin-bottom: 10px;
    }

    form {
        padding: 20px;
    }
}

/* Exam Header */
.exam-header {
    background: linear-gradient(135deg, #e7f3fe 0%, #f9f9f9 100%);
    padding: 15px;
    border-left: 6px solid #2575fc;
    margin: 20px 0;
    border-radius: 5px;
}

/* Navigation Links */
.nav-links {
    text-align: center;
    margin-top: 20px;
}

.nav-link {
    color: #2575fc;
    text-decoration: none;
    margin: 0 10px;
    transition: color 0.3s ease;
}

.nav-link:hover {
    color: #6a11cb;
    text-decoration: underline;
}

/* Query Form */
.query-form {
    display: flex;
    justify-content: center;
    margin: 20px 0;
}

/* Admin Field */
.admin-field {
    background-color: #f9f9f9;
    padding: 15px;
    border-radius: 5px;
    margin: 10px 0;
    border: 1px solid #ddd;
}