body {
    font-family: 'Arial', sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
    color: #333;
    line-height: 1.6;
}

header {
    background-color: #333;
    color: #fff;
    padding: 1.5rem 0;
    text-align: center;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

h1 {
    margin: 0 0 0.5rem 0;
    font-size: 2.8rem;
}

header p {
    margin: 0;
    font-size: 1.2rem;
    color: #bbb;
}

main {
    max-width: 960px; /* 稍窄一点，更适合文本链接 */
    margin: 30px auto;
    padding: 0 20px;
}

#ad-list-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); /* 响应式列布局 */
    gap: 25px; /* 广告卡片之间的间距 */
    padding: 20px 0;
}

.ad-card {
    background-color: #fff;
    border: 1px solid #ddd;
    border-radius: 10px;
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.08);
    padding: 25px;
    text-align: left; /* 文本左对齐 */
    transition: transform 0.3s ease-in-out, box-shadow 0.3s ease-in-out;
    cursor: pointer; /* 提示可点击 */
}

.ad-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.15);
}

.ad-card h2 {
    font-size: 1.6rem;
    color: #007bff;
    margin-top: 0;
    margin-bottom: 10px;
}

.ad-card p {
    font-size: 1.05rem;
    color: #555;
    margin-bottom: 20px;
    min-height: 60px; /* 确保描述区域有最小高度，卡片高度更一致 */
}

.ad-card .cta-link {
    display: inline-block;
    background-color: #28a745;
    color: #fff;
    border: none;
    padding: 10px 20px;
    border-radius: 5px;
    text-decoration: none;
    font-size: 1rem;
    font-weight: bold;
    transition: background-color 0.3s ease;
    width: 100%; /* 按钮宽度100% */
    box-sizing: border-box; /* 确保 padding 不会超出宽度 */
    text-align: center;
}

.ad-card .cta-link:hover {
    background-color: #218838;
}

footer {
    background-color: #333;
    color: #fff;
    text-align: center;
    padding: 1.5rem 0;
    margin-top: 50px;
    position: relative;
    bottom: 0;
    width: 100%;
}