:root {
    --bg-color: #ffffff;
    --text-color: #333;
    --border-color: #e0e0e0;
    --title-color: #2f3941;
    --hover-bg: #f0f1ff;
    --shadow-color: rgba(0, 0, 0, 0.05);
    --purple-color: #7E83F7;
    --purple-shadow: rgba(126, 131, 247, 0.3);
    --divider-color: #e9ebed;
}

[data-theme='dark'] {
    --bg-color: #1a1a1a;
    --text-color: #e0e0e0;
    --border-color: #333333;
    --title-color: #ffffff;
    --hover-bg: #2a2a2a;
    --shadow-color: rgba(0, 0, 0, 0.2);
    --purple-color: #7E83F7;
    --purple-shadow: rgba(126, 131, 247, 0.15);
    --divider-color: #333333;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Poppins', 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.5;
    color: var(--text-color);
    background-color: var(--bg-color);
    margin: 0;
    padding: 0;
    height: 100vh;
    width: 100vw;
    overflow-y: scroll;
}

.main-content {
    width: 100%;
    height: 100%;
    background-color: var(--bg-color);
}

.main-content-container {
    max-width: 1140px;
    display: flex;
    gap: 30px;
    margin: 0 auto;
}

.sidebar {
    width: 220px;
    flex-shrink: 0;
}

.sidebar-nav {
    position: sticky;
    top: 100px;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 20px;
    box-shadow: 0 2px 10px var(--shadow-color);
    height: fit-content;
    min-height: 400px;
}

.sidebar-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 25px;
    color: var(--title-color);
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border-color);
}

.sidebar-menu {
    list-style: none;
    padding: 0;
    margin: 0;
}

.sidebar-menu li {
    margin-bottom: 15px;
}

.sidebar-menu a {
    color: var(--text-color);
    text-decoration: none;
    display: block;
    padding: 12px 15px;
    border-radius: 6px;
    transition: all 0.2s ease;
    font-size: 15px;
}

.sidebar-menu a:hover {
    background-color: var(--hover-bg);
    color: var(--purple-color);
}

.sidebar-menu a.active {
    background-color: var(--purple-color);
    color: white;
    font-weight: 500;
    box-shadow: 0 2px 5px var(--purple-shadow);
}

.container {
    flex-grow: 1;
    padding: 20px;
}

.article-header {
    margin-bottom: 30px;
}

.article-title {
    font-size: 28px;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--title-color);
}

.article-body h2 {
    font-size: 24px;
    margin-top: 40px;
    margin-bottom: 20px;
    font-weight: 600;
    border-bottom: 1px solid var(--divider-color);
    padding-bottom: 10px;
    color: var(--purple-color);
}

.article-body h3 {
    font-size: 18px;
    font-weight: 600;
    margin-top: 30px;
    margin-bottom: 15px;
    color: var(--title-color);
}

.article-body p {
    margin-bottom: 16px;
    font-size: 16px;
}

.faq-item {
    margin-bottom: 30px;
}

.faq-question {
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--title-color);
}

.faq-answer {
    margin-left: 0;
}

@media (max-width: 768px) {
    .main-content-container {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        margin-bottom: 20px;
    }
}