:root {
    --bg: #ffffff;
    --fg: #2a2a2a;
    --muted: #6a6a6a;
    --sidebar-bg: #f6f7f9;
    --border: #e4e6ea;
    --link: #2864c8;
    --link-hover: #1a4ea0;
    --active: #1a4ea0;
}

* {
    box-sizing: border-box;
}

html,
body {
    margin: 0;
    padding: 0;
    font-family:
        -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue",
        Arial, "Apple Color Emoji", "Segoe UI Emoji", sans-serif;
    font-size: 15px;
    line-height: 1.55;
    color: var(--fg);
    background: var(--bg);
}

body {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: 280px;
    flex-shrink: 0;
    background: var(--sidebar-bg);
    border-right: 1px solid var(--border);
    padding: 22px 18px;
    overflow-y: auto;
    position: sticky;
    top: 0;
    height: 100vh;
}

.site-title {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 17px;
    font-weight: 700;
    margin: 0 0 14px 0;
    color: var(--fg);
    text-decoration: none;
}

.site-logo {
    width: 32px;
    height: 32px;
    object-fit: contain;
    flex-shrink: 0;
}

#search {
    width: 100%;
    padding: 7px 10px;
    font-size: 14px;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: #fff;
    margin-bottom: 14px;
    outline: none;
}
#search:focus {
    border-color: var(--link);
}
.search-form {
    margin: 0;
}

/* search results page */
.search-page {
    display: flex;
    gap: 8px;
    margin: 0 0 20px 0;
}
.search-page input {
    flex: 1;
    padding: 9px 12px;
    font-size: 15px;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: #fff;
    outline: none;
}
.search-page input:focus {
    border-color: var(--link);
}
.search-page button {
    padding: 9px 18px;
    font-size: 15px;
    font-weight: 600;
    color: #fff;
    background: var(--link);
    border: 0;
    border-radius: 6px;
    cursor: pointer;
}
.search-page button:hover {
    background: var(--link-hover);
}
.search-meta {
    color: var(--muted);
    font-size: 14px;
    margin: 0 0 16px 0;
}
.search-results {
    list-style: none;
    padding: 0;
    margin: 0;
}
.search-item {
    padding: 14px 0;
    border-top: 1px solid var(--border);
}
.search-item:last-child {
    border-bottom: 1px solid var(--border);
}
.search-link {
    font-size: 17px;
    font-weight: 600;
    color: var(--link);
    text-decoration: none;
}
.search-link:hover {
    color: var(--link-hover);
    text-decoration: underline;
}
.search-snippet {
    margin: 5px 0 0 0;
    font-size: 14px;
    color: var(--muted);
}
.search-snippet mark {
    background: #fff3bf;
    color: var(--fg);
    padding: 0 1px;
    border-radius: 2px;
}

.nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
}
.nav ul ul {
    padding-left: 12px;
}
.nav li {
    margin: 1px 0;
}
.nav a {
    display: block;
    padding: 3px 6px;
    color: var(--muted);
    text-decoration: none;
    border-radius: 4px;
    font-size: 13px;
}
.nav li.has-children > a {
    color: var(--fg);
    font-size: 14px;
    font-weight: 600;
    margin-top: 6px;
}
.nav a:hover {
    background: #ebedf1;
    color: var(--fg);
}
.nav a.active {
    color: var(--active);
    font-weight: 600;
}
.nav .icon {
    margin-right: 4px;
}

.content {
    flex: 1;
    padding: 36px 48px;
    max-width: 900px;
}

.page-title {
    font-size: 28px;
    font-weight: 700;
    margin: 0 0 18px 0;
    display: flex;
    align-items: center;
    gap: 10px;
}
.page-title .icon {
    font-size: 28px;
}
.back-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    flex-shrink: 0;
    font-size: 20px;
    line-height: 1;
    color: var(--muted);
    text-decoration: none;
    border: 1px solid var(--border);
    border-radius: 7px;
    background: var(--sidebar-bg);
    transition:
        background 0.12s,
        color 0.12s,
        border-color 0.12s;
}
.back-btn:hover {
    color: var(--active);
    border-color: var(--link);
    background: #ebedf1;
}

.page-body h1,
.page-body h2,
.page-body h3 {
    margin-top: 1.6em;
    margin-bottom: 0.4em;
    font-weight: 600;
}
.page-body h2 {
    font-size: 22px;
}
.page-body h3 {
    font-size: 18px;
}

.page-body a {
    color: var(--link);
    text-decoration: none;
}
.page-body a:hover {
    color: var(--link-hover);
    text-decoration: underline;
}

.page-body ul {
    padding-left: 22px;
}
.page-body li {
    margin: 4px 0;
}

.page-body code {
    background: #f1f3f5;
    padding: 1px 5px;
    border-radius: 3px;
    font-size: 0.92em;
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
.page-body pre {
    background: #f6f8fa;
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 12px 14px;
    overflow-x: auto;
}
.page-body pre code {
    background: transparent;
    padding: 0;
}

.page-body table {
    border-collapse: collapse;
    width: 100%;
    margin: 12px 0;
}
.page-body th,
.page-body td {
    border: 1px solid var(--border);
    padding: 6px 10px;
    text-align: left;
}
.page-body th {
    background: #f6f7f9;
    font-weight: 600;
}

.child-list {
    list-style: none;
    padding: 0;
    margin: 0 0 28px 0;
}
.child-item {
    padding: 10px 0;
    border-bottom: 1px solid var(--border);
}
.child-item:first-child {
    border-top: 1px solid var(--border);
}
.child-item a {
    font-size: 16px;
    font-weight: 600;
    color: var(--link);
    text-decoration: none;
}
.child-item a:hover {
    color: var(--link-hover);
    text-decoration: underline;
}
.child-item .icon {
    margin-right: 6px;
}
.child-desc {
    margin: 4px 0 0 0;
    font-size: 14px;
    color: var(--muted);
}

.page-body details {
    border: 1px solid var(--border);
    border-radius: 6px;
    margin: 8px 0;
    padding: 0;
}
.page-body details[open] {
    padding: 0 20px 10px 20px;
}
.page-body summary {
    padding: 10px 14px;
    font-weight: 600;
    cursor: pointer;
    user-select: none;
    list-style: none;
}
.page-body summary::before {
    content: "▶ ";
    font-size: 11px;
    color: var(--muted);
}
.page-body details[open] summary::before {
    content: "▼ ";
}
.page-body details ul {
    margin: 8px 0 0 0;
    padding-left: 36px;
}

.page-body blockquote {
    border-left: 3px solid var(--border);
    padding-left: 12px;
    color: var(--muted);
    margin: 12px 0;
}

.logout {
    display: inline-block;
    margin-top: 18px;
    padding: 5px 10px;
    font-size: 13px;
    color: var(--muted);
    text-decoration: none;
    border: 1px solid var(--border);
    border-radius: 6px;
}
.logout:hover {
    color: var(--fg);
    background: #ebedf1;
}

/* login page */
.login-body {
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: var(--sidebar-bg);
}
.login-card {
    text-align: center;
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 40px 44px;
    max-width: 380px;
    box-shadow: 0 6px 24px rgba(0, 0, 0, 0.05);
}
.login-logo {
    width: 56px;
    height: 56px;
    object-fit: contain;
}
.login-title {
    font-size: 22px;
    font-weight: 700;
    margin: 14px 0 6px 0;
}
.login-text {
    color: var(--muted);
    font-size: 14px;
    margin: 0 0 22px 0;
}
.login-widget {
    display: flex;
    justify-content: center;
    min-height: 48px;
}

@media (max-width: 800px) {
    body {
        flex-direction: column;
    }
    .sidebar {
        width: 100%;
        height: auto;
        position: relative;
        border-right: 0;
        border-bottom: 1px solid var(--border);
    }
    .content {
        padding: 24px;
    }
}