/* 定义根变量 */
:root {
    --main-color: #00BFA5; /* 主色调 - 蓝绿色 */
    --accent-color-1: #FF9800; /* 点缀色 1 - 橙色 */
    --accent-color-2: #9C27B0; /* 点缀色 2 - 紫色 */
    --background-gradient: linear-gradient(135deg, #00BFA5, #9C27B0);
    --font-primary: 'Roboto', sans-serif;
    --font-secondary: 'Poppins', sans-serif;
    --text-color: #333333;
    --background-color: #F5F5F5;
    --header-color: #FFFFFF;
    --card-background: #FFFFFF;
    --card-border: #E0E0E0;
    --box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    --transition-speed: 0.3s;
}

/* 全局样式 */
body {
    margin: 0;
    padding: 0;
    font-family: var(--font-primary);
    background: var(--background-gradient);
    color: var(--text-color);
    line-height: 1.6;
}

/* 导航栏样式 */
.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: 200px;
    height: 100vh;
    background-color: var(--header-color);
    box-shadow: 2px 0 5px rgba(0,0,0,0.1);
    padding-top: 20px;
}

.sidebar nav a {
    display: block;
    padding: 15px 20px;
    color: var(--main-color);
    text-decoration: none;
    font-family: var(--font-secondary);
    transition: background var(--transition-speed), color var(--transition-speed);
}

.sidebar nav a:hover {
    background-color: var(--accent-color-1);
    color: #ffffff;
    transform: scale(1.05);
}

.sidebar nav a[rel="nofollow"]::after {
    content: '';
}

/* 主内容区 */
.content {
    margin-left: 220px;
    padding: 20px;
    max-width: 1200px;
    margin-top: 20px;
    background-color: rgba(255, 255, 255, 0.8);
    border-radius: 10px;
    box-shadow: var(--box-shadow);
}

.content h1, .content h2, .content h3, .content h4 {
    font-family: var(--font-secondary);
    color: var(--main-color);
}

.content pre {
    background-color: #272822;
    color: #f8f8f2;
    padding: 15px;
    border-radius: 5px;
    overflow-x: auto;
    font-family: 'Courier New', Courier, monospace;
}

.content code {
    background-color: #f5f5f5;
    padding: 2px 4px;
    border-radius: 3px;
    font-family: 'Courier New', Courier, monospace;
}

.content table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
}

.content table, .content th, .content td {
    border: 1px solid var(--card-border);
}

.content th, .content td {
    padding: 10px;
    text-align: left;
}

.content img {
    width: 100%;
    max-width: 320px;
    height: auto;
    border-radius: 8px;
    margin: 10px 0;
}

.button {
    background-color: var(--accent-color-1);
    color: #FFFFFF;
    padding: 10px 20px;
    border: none;
    border-radius: 5px;
    transition: transform var(--transition-speed), background-color var(--transition-speed);
    cursor: pointer;
    font-family: var(--font-secondary);
}

.button:hover {
    transform: scale(1.1);
    background-color: var(--accent-color-2);
}

.welcome-screen {
    background-image: var(--background-gradient);
    color: #FFFFFF;
    text-align: center;
    padding: 50px;
    border-radius: 10px;
    margin-bottom: 30px;
}

.welcome-screen h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.welcome-screen p {
    font-size: 1.2rem;
    opacity: 0.8;
}

/* 响应式设计 */
@media (max-width: 1440px) {
    .content {
        max-width: 1000px;
    }
}

@media (max-width: 1200px) {
    .content {
        max-width: 900px;
    }
}

@media (max-width: 1024px) {
    .sidebar {
        width: 180px;
    }
    .content {
        margin-left: 200px;
        padding: 15px;
    }
}

@media (max-width: 768px) {
    .sidebar {
        position: relative;
        width: 100%;
        height: auto;
        box-shadow: none;
    }
    .content {
        margin-left: 0;
        padding: 10px;
    }
}

@media (max-width: 480px) {
    .sidebar nav a {
        padding: 10px 15px;
        font-size: 14px;
    }
    .welcome-screen h1 {
        font-size: 2rem;
    }
    .welcome-screen p {
        font-size: 1rem;
    }
}

@media (max-width: 320px) {
    .sidebar nav a {
        padding: 8px 12px;
        font-size: 12px;
    }
    .welcome-screen h1 {
        font-size: 1.5rem;
    }
    .welcome-screen p {
        font-size: 0.9rem;
    }
}

/* 动画效果 */
@keyframes aurora-move {
    0% {
        background: radial-gradient(circle, rgb(255, 87, 34), transparent);
    }
    50% {
        background: radial-gradient(circle, rgb(34, 193, 195), transparent);
    }
    100% {
        background: radial-gradient(circle, rgb(255, 87, 34), transparent);
    }
}

.background-gradient {
    animation: aurora-move 15s linear infinite;
}

/* 提示样式 */
.reference-note {
    background-color: rgba(255, 255, 255, 0.9);
    padding: 20px;
    border-left: 5px solid var(--accent-color-1);
    margin: 20px 0;
    border-radius: 5px;
    font-family: var(--font-primary);
}