/* 默认浅色模式 */
:root {
    --background-color: #ffffff;
    --text-color: #000000;
    --border-color: #cccccc;
    --button-bg-color: #f0f0f0;
    --button-hover-bg-color: #e0e0e0;
}

/* 深色模式 */
[data-theme="dark"] {
    --background-color: #121212;
    --text-color: #ffffff;
    --border-color: #333333;
    --button-bg-color: #333333;
    --button-hover-bg-color: #444444;
}

body {
    background-color: var(--background-color);
    color: var(--text-color);
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 20px;
    transition: background-color 0.3s, color 0.3s;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 10px;
}

#theme-toggle {
    background-color: var(--button-bg-color);
    border: none;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.3s, transform 0.3s;
}

#theme-toggle:hover {
    background-color: var(--button-hover-bg-color);
    transform: scale(1.1);
}

#theme-icon {
    font-size: 20px;
    transition: transform 0.3s;
}

#posts {
    margin-top: 20px;
}

#post-list {
    list-style-type: none;
    padding: 0;
}

#post-list li {
    border: 1px solid var(--border-color);
    padding: 10px;
    margin-bottom: 10px;
    border-radius: 5px;
    transition: background-color 0.3s, border-color 0.3s;
}

#new-post {
    margin-top: 20px;
}

#post-form textarea {
    width: 100%;
    height: 100px;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    margin-bottom: 10px;
    background-color: var(--background-color);
    color: var(--text-color);
    transition: background-color 0.3s, color 0.3s, border-color 0.3s;
}

#post-form button {
    padding: 5px 10px;
    cursor: pointer;
    background-color: var(--button-bg-color);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    border-radius: 5px;
    transition: background-color 0.3s, color 0.3s, border-color 0.3s;
}

#post-form button:hover {
    background-color: var(--button-hover-bg-color);
}