body {
    font-family: 'Open Sans', sans-serif;
    color: #333;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    background-color: #f0f4f8;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

header {
    background: #778899;
    color: #fff;
    padding: 1rem 0;
    text-align: center;
}

nav {
    display: inline-block;
    margin-top: 10px;
}

nav ul {
    list-style: none;
    padding: 0;
    display: inline;
}

nav ul li {
    display: inline;
    margin: 0 10px;
}

nav ul li button {
    background: #4169e1;
    color: #fff;
    border: none;
    padding: 0.5rem 1rem;
    cursor: pointer;
    border-radius: 5px;
}

nav ul li button:hover {
    background: #3a5ec7;
}

main {
    width: 100%;
    max-width: 1200px;
    margin: 2rem auto;
    padding: 1rem;
    background: #fff;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    flex-grow: 1;
    box-sizing: border-box;
}

.container {
    display: flex;
    flex-wrap: wrap;
}

.post-list, .post-editor {
    flex: 1 1 45%;
    padding: 1rem;
    margin: 1rem;
    background: #fff;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    box-sizing: border-box;
}

.post-list ul {
    list-style: none;
    padding: 0;
}

.post-item {
    border-bottom: 1px solid #ccc;
    padding: 1rem 0;
}

.post-item h3 {
    margin: 0;
}

button {
    background: #4169e1;
    color: #fff;
    border: none;
    padding: 0.5rem 1rem;
    cursor: pointer;
    border-radius: 5px;
    margin-right: 0.5rem;
}

button:hover {
    background: #3a5ec7;
}

footer {
    background: #778899;
    color: #fff;
    text-align: center;
    padding: 1rem 0;
    margin-top: auto;
    width: 100%;
}