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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #fff;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header & Navigation */
header {
    background: #f8f9fa;
    border-bottom: 1px solid #e0e0e0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand a {
    font-size: 24px;
    font-weight: bold;
    color: #333;
    text-decoration: none;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 30px;
}

.nav-menu a {
    text-decoration: none;
    color: #666;
    transition: color 0.3s;
}

.nav-menu a:hover,
.nav-menu a.active {
    color: #0366d6;
}

/* Main Content */
main {
    min-height: calc(100vh - 200px);
    padding: 40px 0;
    display: flex;
    align-items: flex-start;
    gap: 40px;
}

.sidebar {
    width: 200px;
    flex-shrink: 0;
}

.main-content {
    flex: 1;
}

.page-header {
    margin-bottom: 30px;
    padding: 0;
    margin-top: 0;
}

.page-header h1 {
    font-size: 32px;
    margin: 0;
}

.page-body {
    font-size: 16px;
    line-height: 1.8;
}

.page-body h2:first-of-type {
    margin-top: 0;
    margin-bottom: 15px;
    font-size: 24px;
    color: #333;
}

.page-body h2 {
    margin-top: 30px;
    margin-bottom: 15px;
    font-size: 24px;
    color: #333;
}

.page-body h2::after {
    content: "";
    display: block;
    height: 1px;
    background: #e0e0e0;
    margin: 12px 0 18px;
}

.page-body h3 {
    margin-top: 20px;
    margin-bottom: 10px;
    font-size: 20px;
    color: #555;
}

.page-body p {
    margin-bottom: 15px;
}

.page-body ul,
.page-body ol {
    margin-left: 20px;
    margin-bottom: 15px;
}

.page-body li {
    margin-bottom: 8px;
}

.page-body a {
    color: #0366d6;
    text-decoration: none;
}

.page-body a:hover {
    text-decoration: underline;
}

.page-body strong {
    font-weight: 600;
}

.page-body em {
    font-style: italic;
}

/* Home Page */
.home-intro {
    display: flex;
    justify-content: flex-start;
    margin-bottom: 30px;
}

.sidebar-info {
    display: flex;
    flex-direction: column;
    padding: 0;
    margin: 0;
}

.avatar {
    width: 200px;
    height: 260px;
    object-fit: cover;
    border: 3px solid #e0e0e0;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.sidebar-links {
    margin-top: 20px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.sidebar-links a {
    color: #000;
    text-decoration: none;
    font-size: 15px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.sidebar-links a i {
    width: 20px;
    text-align: center;
}

.sidebar-links a:hover {
    text-decoration: underline;
}

.home-content {
    padding-top: 0;
}

/* Footer */
footer {
    background: #f8f9fa;
    border-top: 1px solid #e0e0e0;
    padding: 40px 0;
    margin-top: 60px;
}

.footer-content {
    text-align: center;
}

.author-links {
    margin-bottom: 20px;
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}

.author-links a {
    color: #0366d6;
    text-decoration: none;
}

.author-links a:hover {
    text-decoration: underline;
}

footer p {
    color: #666;
    font-size: 14px;
}

/* Responsive */
@media (max-width: 768px) {
    main {
        flex-direction: column;
        gap: 20px;
    }

    .sidebar {
        width: 100%;
        display: flex;
        justify-content: center;
    }

    .sidebar-info {
        display: flex;
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .avatar {
        width: 150px;
        height: 200px;
    }

    .sidebar-links {
        margin-top: 20px;
        display: flex;
        flex-direction: column;
        gap: 12px;
        width: 100%;
    }

    .nav-container {
        flex-direction: column;
        gap: 15px;
    }

    .nav-menu {
        gap: 15px;
        flex-wrap: nowrap;
        justify-content: center;
    }

    .page-header h1 {
        font-size: 24px;
    }

    .page-body h2 {
        font-size: 20px;
    }

    main {
        padding: 20px 0;
    }
}

/* Code blocks */
.page-body pre {
    background: #f6f8fa;
    border-radius: 6px;
    padding: 16px;
    overflow-x: auto;
    margin-bottom: 15px;
}

.page-body code {
    background: #f6f8fa;
    padding: 2px 6px;
    border-radius: 3px;
    font-family: SFMono-Regular, Consolas, "Liberation Mono", Menlo, monospace;
    font-size: 12px;
}

.page-body pre code {
    padding: 0;
    background: transparent;
}

/* Tables */
.page-body table {
    border-collapse: collapse;
    width: 100%;
    margin-bottom: 15px;
}

.page-body th,
.page-body td {
    border: 1px solid #ddd;
    padding: 12px;
    text-align: left;
}

.page-body th {
    background: #f6f8fa;
    font-weight: bold;
}