body {
    font-family: Arial, sans-serif;
    margin: 0;
    background: #f4f6f8;
    color: #222;
}

header {
    background: #1f2937;
    color: white;
    padding: 1rem 2rem;
}

header h1 {
    margin: 0 0 0.5rem 0;
}

nav a {
    color: white;
    margin-right: 1rem;
    text-decoration: none;
}

nav span {
    color: #d1d5db;
}

.layout {
    display: flex;
    min-height: calc(100vh - 95px);
}

.sidebar {
    width: 300px;
    background: #111827;
    color: white;
    padding: 1rem;
    overflow-y: auto;
}

.sidebar h3 {
    margin-top: 0;
}

.sidebar ul {
    list-style: none;
    padding-left: 1rem;
}

.sidebar li {
    margin: 0.35rem 0;
}

.sidebar a {
    color: #e5e7eb;
    text-decoration: none;
}

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

.folder strong {
    color: #93c5fd;
}

.page-link {
    font-size: 0.95rem;
}

main {
    flex: 1;
    max-width: none;
    margin: 0;
    background: white;
    padding: 2rem 3rem;
    overflow-x: auto;
}

form {
    max-width: 400px;
}

label {
    display: block;
    margin-top: 1rem;
}

input {
    width: 100%;
    padding: 0.6rem;
    margin-top: 0.3rem;
}

button {
    margin-top: 1rem;
    padding: 0.7rem 1.2rem;
    cursor: pointer;
}

.error {
    color: darkred;
    font-weight: bold;
}

.markdown-content {
    line-height: 1.65;
    font-size: 1rem;
}

.markdown-content h1,
.markdown-content h2,
.markdown-content h3 {
    border-bottom: 1px solid #e5e7eb;
    padding-bottom: 0.3rem;
}

.markdown-content img {
    max-width: 100%;
    height: auto;
    border: 1px solid #ddd;
    border-radius: 6px;
    margin: 1rem 0;
}

.markdown-content pre {
    background: #111827;
    color: white;
    padding: 1rem;
    overflow-x: auto;
    border-radius: 6px;
}

.markdown-content code {
    background: #f3f4f6;
    padding: 0.15rem 0.3rem;
    border-radius: 4px;
}

.markdown-content pre code {
    background: transparent;
    padding: 0;
}

.markdown-content table {
    border-collapse: collapse;
    width: 100%;
    margin: 1rem 0;
}

.markdown-content th,
.markdown-content td {
    border: 1px solid #ccc;
    padding: 0.5rem;
}

.markdown-content blockquote {
    border-left: 4px solid #9ca3af;
    padding-left: 1rem;
    color: #4b5563;
    background: #f9fafb;
}