/* 全局样式 */
body {
    margin: 0;
    font-family: 'Open Sans', sans-serif;
    background: radial-gradient(circle, rgba(255,87,34,0.5), transparent), linear-gradient(135deg, #1e3c72, #2a5298);
    background-size: 400% 400%;
    animation: aurora-move 15s linear infinite;
    color: #fff;
}

/* 动画关键帧 */
@keyframes aurora-move {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

/* 标题样式 */
h1, h2, h3, h4 {
    font-family: 'Roboto', sans-serif;
    color: #ffffff;
    margin: 20px 0;
}

h1 {
    font-size: 2.5rem;
    text-align: center;
}

h2 {
    font-size: 2rem;
}

h3 {
    font-size: 1.5rem;
}

p {
    font-size: 1rem;
    line-height: 1.6;
    color: #f0f0f0;
}

/* 容器和网格布局 */
.container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    padding: 20px;
}

/* 卡片样式 */
.card {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 15px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
    padding: 20px;
    text-align: center;
    color: #ffffff;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.3);
}

/* 图标样式 */
.card .icon {
    font-size: 2.5rem;
    margin-bottom: 10px;
}

/* 按钮样式 */
.button {
    display: inline-block;
    padding: 10px 20px;
    background: linear-gradient(45deg, #ff7e5f, #feb47b);
    color: #fff;
    border: none;
    border-radius: 25px;
    text-decoration: none;
    font-size: 0.9rem;
    margin-top: 15px;
    transition: background 0.3s ease;
}

.button:hover {
    background: linear-gradient(45deg, #feb47b, #ff7e5f);
}

/* 文章样式 */
.article {
    background: rgba(255, 255, 255, 0.2);
    border-radius: 10px;
    padding: 20px;
    margin: 20px;
    color: #fff;
    overflow: auto;
}

.article pre {
    background: #2a2a2a;
    padding: 10px;
    border-radius: 5px;
    overflow-x: auto;
}

.article code {
    color: #ffcc00;
    font-family: 'Courier New', Courier, monospace;
}

/* 提示样式 */
.reference {
    text-align: center;
    font-size: 1rem;
    color: #ffdd57;
    margin: 20px 0;
}

/* 图片样式 */
img {
    max-width: 100%;
    border-radius: 10px;
    margin-top: 10px;
}

/* 自适应布局 */
@media (max-width: 320px) {
    h1 {
        font-size: 1.8rem;
    }
    .button {
        padding: 8px 16px;
        font-size: 0.8rem;
    }
}

@media (min-width: 321px) and (max-width: 480px) {
    h1 {
        font-size: 2rem;
    }
}

@media (min-width: 481px) and (max-width: 768px) {
    h1 {
        font-size: 2.2rem;
    }
}

@media (min-width: 769px) and (max-width: 1024px) {
    h1 {
        font-size: 2.5rem;
    }
}

@media (min-width: 1025px) and (max-width: 1200px) {
    h1 {
        font-size: 2.8rem;
    }
}

@media (min-width: 1201px) {
    h1 {
        font-size: 3rem;
    }
}

/* 内部链接样式 */
a {
    color: #ffffff;
}

a:visited {
    color: #bbbbbb;
}

/* 卡片动画 */
.card {
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.6s forwards;
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}