/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f4f4f4;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* Navigation */
.navbar {
    background-color: #fff;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    padding: 1rem 0;
    margin-bottom: 2rem;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand {
    font-size: 1.5rem;
    font-weight: bold;
    color: #007bff;
    text-decoration: none;
}

.nav-links {
    display: flex;
    gap: 20px;
}

.nav-links a {
    color: #666;
    text-decoration: none;
    padding: 5px 10px;
    border-radius: 4px;
    transition: background-color 0.3s;
}

.nav-links a:hover {
    background-color: #f0f0f0;
}

.nav-links a.active {
    color: #007bff;
    font-weight: bold;
}

/* Headings */
h1 {
    color: #333;
    margin-bottom: 1.5rem;
    text-align: center;
}

h2 {
    color: #444;
    margin-bottom: 1rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-container {
        flex-direction: column;
        text-align: center;
    }

    .nav-links {
        margin-top: 1rem;
        flex-direction: column;
        gap: 10px;
    }

    .container {
        padding: 10px;
    }
}

/* Common Components */
.btn {
    display: inline-block;
    padding: 10px 20px;
    background-color: #007bff;
    color: white;
    text-decoration: none;
    border-radius: 4px;
    border: none;
    cursor: pointer;
    transition: background-color 0.3s;
}

.btn:hover {
    background-color: #0056b3;
}

/* Card styles */
.card {
    background: white;
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

/* Form styles */
input[type="text"],
input[type="file"],
textarea {
    width: 100%;
    padding: 8px;
    margin-bottom: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
}

/* Message styles */
.message {
    padding: 10px;
    margin-bottom: 20px;
    border-radius: 4px;
}

.message.success {
    background-color: #d4edda;
    color: #155724;
}

.message.error {
    background-color: #f8d7da;
    color: #721c24;
}