* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

 :root {
    --dark-bg: #121212;
    --darker-bg: #0a0a0a;
    --dark-card: #1e1e1e;
    --dark-border: #2a2a2a;
    --accent: #441177;
    --accent-hover: #7e1fc1;
    --text: #e0e0e0;
    --text-secondary: #b0b0b0;
}

body {
    background-color: var(--dark-bg);
    color: var(--text);
    height: 100vh;
    overflow: hidden;
    display: grid;
    grid-template-columns: 1fr 300px;
    grid-template-rows: 60px 1fr;
    grid-template-areas: "header sidebar" "main sidebar";
}


/* 顶部导航栏样式 */

header {
    grid-area: header;
    background-color: var(--darker-bg);
    border-bottom: 1px solid var(--dark-border);
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 100;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

.logo {
    font-size: 1.8rem;
    font-weight: 700;
    background: linear-gradient(45deg, var(--accent), var(--accent-hover));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    letter-spacing: 1px;
}

nav ul {
    display: flex;
    list-style: none;
    gap: 25px;
}

nav a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 1rem;
    font-weight: 500;
    transition: all 0.3s ease;
    padding: 5px 10px;
    border-radius: 4px;
    border: 1px var(--darker-bg) solid;
    display: flex;
}

nav a:hover {
    border: 1px var(--accent) solid;
    color: var(--accent-hover);
    transition: all 0.5s ease;
}

nav a.active {
    color: var(--text);
    background-color: var(--accent);
}


/* 主内容区域样式 */

main {
    grid-area: main;
    padding: 30px;
    overflow-y: auto;
    background: linear-gradient(135deg, #1a1a1a, #0f0f0f);
}

section {
    padding: 40px;
    margin-bottom: 30px;
    border-radius: 12px;
    background-color: var(--dark-card);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.4);
    border: 1px solid var(--dark-border);
}

section h2 {
    font-size: 2.5rem;
    margin-bottom: 25px;
    color: #ffffff;
    position: relative;
    padding-bottom: 15px;
}

section h2:after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 200px;
    height: 5px;
    background: linear-gradient(90deg, var(--accent), transparent);
    border-radius: 5px;
}

section p {
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.content-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 25px;
    margin-top: 30px;
}

.card {
    background-color: rgba(30, 30, 30, 0.7);
    border-radius: 10px;
    padding: 25px;
    border: 1px solid var(--dark-border);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(106, 13, 173, 0.2);
    border-color: var(--accent);
}

.card h3 {
    font-size: 1.4rem;
    margin-bottom: 15px;
    color: #ffffff;
}


/* 侧边栏样式 */

.sidebar {
    grid-area: sidebar;
    background-color: var(--darker-bg);
    border-left: 1px solid var(--dark-border);
    display: flex;
    flex-direction: column;
    height: 100%;
}

.toc-container {
    flex: 1;
    padding: 25px 15px;
    overflow-y: auto;
    border-bottom: 1px solid var(--dark-border);
}

.toc-title {
    font-size: 1.2rem;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--accent);
    color: var(--accent-hover);
}

.toc-list {
    list-style: none;
}

.toc-item {
    padding: 12px 15px;
    margin-bottom: 8px;
    border: 1px var(--dark-card) solid;
    border-radius: 6px;
    transition: all 0.2s ease;
    background-color: rgba(40, 40, 40, 0.5);
    border-left: 1px dashed transparent;
}

.toc-item:hover {
    border: 1px var(--accent-hover) solid;
    border-left: 8px var(--accent) solid;
    color: var(--accent-hover);
    cursor: pointer;
}

.toc-item.active {
    background-color: var(--accent);
    border: 5px var(--accent) solid;
    border-left: 10px var(--accent-hover) solid;
    color: white;
    cursor: default;
}

.toc-item i {
    margin-right: 10px;
    width: 20px;
    text-align: center;
}

.function-area {
    display: flex;
    flex-direction: row;
    align-items: center;
}

.func-btn {
    border: 0px;
    padding: 14px 5px;
    background-color: var(--dark-card);
    color: var(--text);
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.2s ease;
    /* align-items: center; */
    flex: 1;
    display: flex;
    flex-direction: column;
}

.func-btn:hover {
    background-color: var(--accent);
    border-color: var(--accent);
}

.key-hint {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-top: 20px;
    padding: 0 20px;
}


/* 响应式设计 */

@media (max-width: 900px) {
    body {
        grid-template-columns: 1fr;
        grid-template-rows: 60px 1fr auto;
        grid-template-areas: "header" "main" "sidebar";
    }
    .sidebar {
        height: 250px;
        border-left: none;
        border-top: 1px solid var(--dark-border);
    }
}

@media (max-width: 600px) {
    header {
        grid-template-columns: 1fr;
        grid-template-rows: 60px 1fr auto;
        grid-template-areas: ".logo" "nav";
    }
}


/* 滚动条样式 */

div::-webkit-scrollbar {
    width: 8px;
    background-color: var(--darker-bg);
}

div::-webkit-scrollbar-track {
    background: var(--darker-bg);
}

div::-webkit-scrollbar-thumb {
    background: var(--dark-bg);
    border-radius: 4px;
}

div::-webkit-scrollbar-thumb:hover {
    background: var(--accent-hover);
}