/* 基础样式 */
body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    color: #333;
    background-color: #f5f5f5;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

header {
    background-color: #2c3e50;
    color: white;
    padding: 20px 0;
    text-align: center;
    margin-bottom: 20px;
}

header h1 {
    margin: 0;
}

.main-content {
    display: flex;
    margin-bottom: 20px;
}

.content {
    flex: 3;
    background: white;
    padding: 20px;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.sidebar {
    flex: 1;
    margin-right: 20px;
}

.sidebar .categories {
    background: white;
    padding: 15px;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    margin-bottom: 20px;
}

.sidebar h3 {
    margin-top: 0;
    border-bottom: 1px solid #eee;
    padding-bottom: 10px;
}

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

.sidebar li {
    margin-bottom: 5px;
}

.sidebar a {
    color: #3498db;
    text-decoration: none;
}

.sidebar a:hover {
    text-decoration: underline;
}

footer {
    background-color: #2c3e50;
    color: white;
    text-align: center;
    padding: 10px 0;
    margin-top: 20px;
}

footer a {
    color: #ecf0f1;
}

/* 链接网格 */
.link-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 15px;
    margin-top: 15px;
}

.link-item {
    background: #f9f9f9;
    padding: 15px;
    border-radius: 5px;
    transition: transform 0.2s;
}

.link-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.link-item h3 {
    margin-top: 0;
    color: #2c3e50;
}

.link-item a {
    text-decoration: none;
    color: inherit;
}

/* 下载列表 */
.download-list {
    margin-top: 20px;
}

.download-item {
    background: white;
    padding: 15px;
    margin-bottom: 15px;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.download-btn {
    display: inline-block;
    background: #3498db;
    color: white;
    padding: 8px 15px;
    border-radius: 4px;
    text-decoration: none;
    margin-top: 10px;
}

.download-btn:hover {
    background: #2980b9;
}

/* 广告样式 */
.ad {
    margin: 20px 0;
    text-align: center;
}

.ad img {
    max-width: 100%;
    height: auto;
    border-radius: 5px;
}

.header-ad {
    background: white;
    padding: 10px;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.sidebar-ad {
    background: white;
    padding: 10px;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    margin-bottom: 20px;
}

.footer-ad {
    background: white;
    padding: 10px;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

/* 后台样式 */
.login-container {
    max-width: 400px;
    margin: 50px auto;
    background: white;
    padding: 30px;
    border-radius: 5px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.login-container h1 {
    text-align: center;
    margin-bottom: 20px;
    color: #2c3e50;
}

.form-group {
    margin-bottom: 15px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 8px;
    border: 1px solid #ddd;
    border-radius: 4px;
    box-sizing: border-box;
}

.form-group textarea {
    min-height: 100px;
}

button {
    background: #2c3e50;
    color: white;
    border: none;
    padding: 10px 15px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
}

button:hover {
    background: #1a252f;
}

.error {
    color: #e74c3c;
    margin-bottom: 15px;
    padding: 10px;
    background: #fadbd8;
    border-radius: 4px;
}

.success {
    color: #27ae60;
    margin-bottom: 15px;
    padding: 10px;
    background: #d5f5e3;
    border-radius: 4px;
}

.admin-header {
    background: #2c3e50;
    color: white;
    padding: 15px 0;
    margin-bottom: 20px;
}

.admin-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.admin-header h1 {
    margin: 0;
    font-size: 24px;
}

.admin-header a {
    color: white;
    text-decoration: none;
}

.admin-nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
}

.admin-nav li {
    margin-left: 15px;
}

.admin-nav a:hover {
    text-decoration: underline;
}