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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.container {
    background: white;
    border-radius: 10px;
    padding: 40px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    max-width: 500px;
    width: 100%;
}

h1 {
    text-align: center;
    margin-bottom: 30px;
    color: #333;
}

h2 {
    text-align: center;
    margin-bottom: 30px;
    color: #333;
}

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

label {
    display: block;
    margin-bottom: 8px;
    color: #555;
    font-weight: 500;
}

input[type="email"],
input[type="password"],
input[type="text"],
textarea,
select {
    width: 100%;
    padding: 12px;
    border: 2px solid #e0e0e0;
    border-radius: 5px;
    font-size: 16px;
    transition: border-color 0.3s;
}

input:focus,
textarea:focus,
select:focus {
    outline: none;
    border-color: #667eea;
}

textarea {
    resize: vertical;
    min-height: 100px;
}

.buttons {
    display: flex;
    gap: 15px;
    justify-content: center;
}

.btn {
    padding: 12px 30px;
    border: none;
    border-radius: 5px;
    font-size: 16px;
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
    text-align: center;
    transition: transform 0.2s, box-shadow 0.2s;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

.btn-primary {
    background: #667eea;
    color: white;
}

.btn-secondary {
    background: #764ba2;
    color: white;
}

.btn-success {
    background: #28a745;
    color: white;
}

.btn-danger {
    background: #dc3545;
    color: white;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.error {
    color: #dc3545;
    margin-top: 10px;
    padding: 10px;
    background: #f8d7da;
    border-radius: 5px;
    display: none;
}

.success {
    color: #28a745;
    margin-top: 10px;
    padding: 10px;
    background: #d4edda;
    border-radius: 5px;
    display: none;
}

.dashboard {
    max-width: 1200px;
    width: 100%;
}

.dashboard-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
}

.dashboard-card {
    background: white;
    border-radius: 10px;
    padding: 30px;
    margin-bottom: 20px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.status-badge {
    display: inline-block;
    padding: 8px 16px;
    border-radius: 20px;
    font-weight: 600;
    margin-top: 10px;
}

.status-active {
    background: #d4edda;
    color: #155724;
}

.certificate-list {
    list-style: none;
    margin-top: 15px;
}

.certificate-list li {
    padding: 10px;
    background: #f8f9fa;
    margin-bottom: 10px;
    border-radius: 5px;
    border-left: 4px solid #667eea;
}

.edit-section {
    margin-bottom: 40px;
}

.lesson-grid,
.quiz-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.lesson-card,
.quiz-card {
    background: #f8f9fa;
    padding: 20px;
    border-radius: 8px;
    border: 2px solid #e0e0e0;
}

.lesson-card h3,
.quiz-card h3 {
    margin-bottom: 15px;
    color: #667eea;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

@media (max-width: 768px) {
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .lesson-grid,
    .quiz-grid {
        grid-template-columns: 1fr;
    }
}