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

:root {
    --primary-green: #2d6a4f;
    --light-green: #40916c;
    --dark-green: #1b4332;
    --accent-green: #52b788;
    --white: #ffffff;
    --light-gray: #f8f9fa;
    --text-dark: #212529;
    --border-color: #d4edda;
    --success: #28a745;
    --danger: #dc3545;
    --warning: #ffc107;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, var(--light-green) 0%, var(--primary-green) 100%);
    min-height: 100vh;
    color: var(--text-dark);
}

/* Login Page Styles */
.login-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
}

.login-box {
    background: var(--white);
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    padding: 40px;
    width: 100%;
    max-width: 450px;
}

.logo-container {
    text-align: center;
    margin-bottom: 30px;
}

.logo-container img {
    max-width: 150px;
    height: auto;
    margin-bottom: 15px;
}

.logo-container h1 {
    color: var(--primary-green);
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 5px;
}

.logo-container p {
    color: var(--light-green);
    font-size: 14px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    color: var(--primary-green);
    font-weight: 600;
    margin-bottom: 8px;
    font-size: 14px;
}

.form-control {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
    transition: all 0.3s ease;
}

.form-control:focus {
    outline: none;
    border-color: var(--accent-green);
    box-shadow: 0 0 0 3px rgba(82, 183, 136, 0.1);
}

.btn {
    padding: 12px 25px;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
}

.btn-primary {
    background: var(--primary-green);
    color: var(--white);
    width: 100%;
}

.btn-primary:hover {
    background: var(--dark-green);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(45, 106, 79, 0.3);
}

.btn-success {
    background: var(--success);
    color: var(--white);
}

.btn-danger {
    background: var(--danger);
    color: var(--white);
}

.alert {
    padding: 12px 15px;
    border-radius: 8px;
    margin-bottom: 20px;
    font-size: 14px;
}

.alert-danger {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.alert-success {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

/* Dashboard Styles */
.dashboard {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

.header {
    background: var(--white);
    border-radius: 15px;
    padding: 25px;
    margin-bottom: 30px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
}

.header h1 {
    color: var(--primary-green);
    font-size: 28px;
    margin-bottom: 10px;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 15px;
}

.user-info span {
    color: var(--text-dark);
    font-weight: 600;
}

.logout-btn {
    background: var(--danger);
    color: var(--white);
    padding: 10px 20px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
}

.logout-btn:hover {
    background: #c82333;
    transform: translateY(-2px);
}

/* Cards */
.card {
    background: var(--white);
    border-radius: 15px;
    padding: 25px;
    margin-bottom: 25px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
}

.card-header {
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 15px;
    margin-bottom: 20px;
}

.card-header h2 {
    color: var(--primary-green);
    font-size: 22px;
}

/* Table Styles */
.table-responsive {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 15px;
}

table thead {
    background: var(--primary-green);
    color: var(--white);
}

table th,
table td {
    padding: 12px 15px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

table tbody tr:hover {
    background: var(--light-gray);
}

/* Modal Styles */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    z-index: 9999;
    justify-content: center;
    align-items: center;
    overflow-y: auto;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--white);
    border-radius: 15px;
    padding: 30px;
    max-width: 700px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
    animation: slideDown 0.3s ease;
}

@keyframes slideDown {
    from {
        transform: translateY(-50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.modal-header {
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 2px solid var(--border-color);
}

.modal-header h2 {
    color: var(--primary-green);
    font-size: 24px;
}

.close-modal {
    position: absolute;
    top: 20px;
    right: 20px;
    font-size: 28px;
    color: var(--text-dark);
    cursor: pointer;
    background: none;
    border: none;
    width: 35px;
    height: 35px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: all 0.3s ease;
}

.close-modal:hover {
    background: var(--light-gray);
    color: var(--danger);
}

.instructions-list {
    margin: 20px 0;
}

.instructions-list h3 {
    color: var(--primary-green);
    margin: 20px 0 10px 0;
    font-size: 18px;
}

.instructions-list ul {
    list-style-position: inside;
    margin-left: 10px;
}

.instructions-list li {
    margin: 10px 0;
    color: var(--text-dark);
    line-height: 1.6;
}

.warning-text {
    color: var(--danger);
    font-weight: 600;
}

/* Exam Container */
.exam-container {
    max-width: 900px;
    margin: 0 auto;
    padding: 20px;
}

.exam-header {
    background: var(--white);
    border-radius: 15px;
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
}

.timer {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary-green);
    display: flex;
    align-items: center;
    gap: 10px;
}

.timer.warning {
    color: var(--danger);
    animation: pulse 1s infinite;
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.7;
    }
}

.question-card {
    background: var(--white);
    border-radius: 15px;
    padding: 30px;
    margin-bottom: 20px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
}

.question-number {
    color: var(--primary-green);
    font-weight: 700;
    font-size: 18px;
    margin-bottom: 15px;
}

.question-text {
    color: var(--text-dark);
    font-size: 18px;
    line-height: 1.6;
    margin-bottom: 25px;
}

.options {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.option {
    padding: 15px 20px;
    border: 2px solid var(--border-color);
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 15px;
}

.option:hover {
    border-color: var(--accent-green);
    background: rgba(82, 183, 136, 0.1);
}

.option input[type="radio"] {
    width: 20px;
    height: 20px;
    cursor: pointer;
}

.option.selected {
    border-color: var(--primary-green);
    background: rgba(45, 106, 79, 0.1);
}

.navigation-buttons {
    display: flex;
    justify-content: space-between;
    gap: 15px;
    margin-top: 30px;
}

.btn-secondary {
    background: var(--light-green);
    color: var(--white);
    padding: 12px 25px;
}

.btn-secondary:hover {
    background: var(--primary-green);
}

/* Grid Layout for Exams */
.exam-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.exam-item {
    background: var(--white);
    border-radius: 15px;
    padding: 25px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    cursor: pointer;
}

.exam-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.exam-item h3 {
    color: var(--primary-green);
    margin-bottom: 10px;
}

.exam-item p {
    color: var(--text-dark);
    margin: 5px 0;
}

/* Responsive */
@media (max-width: 768px) {
    .header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .user-info {
        margin-top: 15px;
        width: 100%;
        flex-direction: column;
        align-items: flex-start;
    }
    
    .navigation-buttons {
        flex-direction: column;
    }
    
    .exam-grid {
        grid-template-columns: 1fr;
    }
}

/* Loading Spinner */
.spinner {
    border: 4px solid var(--light-gray);
    border-top: 4px solid var(--primary-green);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 20px auto;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.text-center {
    text-align: center;
}

.mb-20 {
    margin-bottom: 20px;
}

.mt-20 {
    margin-top: 20px;
}