body {
    margin: 0;
    font-family: 'Arial', sans-serif;
    background-color: #f8f9fa;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: #343a40;
    padding: 10px 20px;
}

.logo {
    color: #ffffff;
    font-size: 24px;
    font-weight: bold;
}

nav button {
    background-color: #495057;
    color: #ffffff;
    border: none;
    padding: 8px 12px;
    margin-left: 10px;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.3s;
}

nav button:hover {
    background-color: #6c757d;
}

.main-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 20px;
}

.post-container {
    width: 100%;
    max-width: 800px;
    display: grid;
    gap: 20px;
}

.post {
    background-color: #ffffff;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    padding: 15px;
}

.post img {
    width: 100%;
    border-radius: 8px;
}

.post-content {
    margin-top: 10px;
}

.post-title {
    font-size: 1.5rem;
    margin-bottom: 5px;
    color: #343a40;
}

.post-description {
    color: #6c757d;
    margin-bottom: 10px;
}

.post-time {
    color: #adb5bd;
    font-size: 0.9rem;
}

.popup {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    align-items: center;
    justify-content: center;
}

.popup-content {
    background-color: #ffffff;
    padding: 20px;
    border-radius: 10px;
    width: 400px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    position: relative;
}

.close-popup {
    position: absolute;
    top: 10px;
    right: 10px;
    background: none;
    border: none;
    font-size: 20px;
    cursor: pointer;
    color: #6c757d;
}

input[type="text"],
textarea {
    width: 100%;
    margin-bottom: 10px;
    padding: 8px;
    border: 1px solid #ced4da;
    border-radius: 4px;
}

.submit-btn {
    background-color: #007bff;
    color: #ffffff;
    border: none;
    padding: 10px 15px;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.3s;
}

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