/* 基本样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Roboto', sans-serif;
    line-height: 1.6;
    background: linear-gradient(135deg, #f0f4f8, #d9e2ec);
    color: #333;
    padding: 0;
    margin: 0;
}

a {
    text-decoration: none;
    color: inherit;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

header {
    background: linear-gradient(135deg, #003f87, #0074c6);
    padding: 20px 0;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

header .container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

header .logo {
    color: #fff;
    font-size: 1.5em;
    font-weight: bold;
}

header nav ul {
    list-style: none;
    display: flex;
    gap: 20px;
}

header nav ul li a {
    color: #fff;
    font-size: 1em;
    transition: color 0.3s ease;
}

header nav ul li a:hover {
    color: #ff9800;
}

header .login-btn {
    background-color: #ff9800;
    color: #fff;
    padding: 8px 16px;
    border-radius: 4px;
    transition: background-color 0.3s ease;
}

header .login-btn:hover {
    background-color: #e68900;
}

.main {
    padding: 40px 0;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 20px;
}

.card {
    background: #fff;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    padding: 20px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.card:hover {
    transform: translateY(-10px);
    box-shadow: 0 8px 12px rgba(0,0,0,0.2);
}

.card img {
    width: 80px;
    height: 80px;
    margin-bottom: 15px;
}

.card h3 {
    font-size: 1.2em;
    margin-bottom: 10px;
    color: #0074c6;
}

.card p {
    font-size: 0.95em;
    margin-bottom: 15px;
    color: #555;
}

.card button {
    background-color: #0074c6;
    color: #fff;
    border: none;
    padding: 10px 20px;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.card button:hover {
    background-color: #005a9c;
}

.article-section {
    margin-top: 60px;
    background: #fff;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.article-section h2 {
    font-size: 2em;
    margin-bottom: 20px;
    color: #003f87;
}

.article-section h3 {
    font-size: 1.5em;
    margin: 20px 0 10px;
    color: #0074c6;
}

.article-section p {
    font-size: 1em;
    margin-bottom: 15px;
    color: #444;
}

.article-section ul {
    list-style: disc inside;
    margin-bottom: 15px;
}

.article-section ul li {
    margin-bottom: 10px;
    color: #555;
}

.article-section pre {
    background: #f5f5f5;
    padding: 15px;
    border-radius: 5px;
    overflow-x: auto;
    margin-bottom: 20px;
}

.article-section code {
    font-family: 'Courier New', Courier, monospace;
    color: #d63384;
}

.article-section .alert {
    background-color: #ffebee;
    color: #f44336;
    padding: 10px;
    border-radius: 5px;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
}

.article-section .alert i {
    margin-right: 10px;
}

.footer {
    background: #003f87;
    color: #fff;
    padding: 20px 0;
    text-align: center;
}

.footer p {
    margin: 0;
    font-size: 0.9em;
}

.prompt {
    text-align: center;
    padding: 20px;
    background: linear-gradient(135deg, #d9e2ec, #f0f4f8);
    font-size: 1.2em;
    color: #333;
    margin-top: 40px;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

@media (max-width: 1440px) {
    header .container, .container {
        width: 95%;
    }
}

@media (max-width: 1200px) {
    .card h3 {
        font-size: 1.1em;
    }
    .card p {
        font-size: 0.9em;
    }
}

@media (max-width: 1024px) {
    header nav ul {
        gap: 15px;
    }
    .card-grid {
        grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    }
}

@media (max-width: 768px) {
    header .container {
        flex-direction: column;
        align-items: flex-start;
    }
    header nav ul {
        flex-direction: column;
        gap: 10px;
        margin-top: 10px;
    }
    .card-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    header .logo {
        font-size: 1.2em;
    }
    .card h3 {
        font-size: 1em;
    }
    .card p {
        font-size: 0.85em;
    }
    .article-section h2 {
        font-size: 1.5em;
    }
    .article-section h3 {
        font-size: 1.2em;
    }
}

@media (max-width: 320px) {
    header .login-btn {
        padding: 6px 12px;
        font-size: 0.9em;
    }
    .prompt {
        font-size: 1em;
        padding: 15px;
    }
}

/* 动画效果 */
@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.loader {
    border: 4px solid #f3f3f3;
    border-top: 4px solid #003f87;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 20px auto;
}

/* 代码块样式 */
.code-block {
    background: #282c34;
    color: #abb2bf;
    padding: 15px;
    border-radius: 5px;
    overflow-x: auto;
    font-size: 0.9em;
}

.code-block .keyword { color: #c678dd; }
.code-block .string { color: #98c379; }
.code-block .comment { color: #5c6370; }
.code-block .function { color: #61afef; }

/* 按钮动画 */
button {
    cursor: pointer;
}

button:focus {
    outline: none;
}

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-thumb {
    background-color: rgba(0,0,0,0.2);
    border-radius: 4px;
}

::-webkit-scrollbar-track {
    background: rgba(0,0,0,0.05);
}