:root {
    --primary-color: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #eff6ff;
    --secondary-color: #64748b;
    --light-color: #fbfdff;
    --dark-color: #0f172a;
    --border-color: #edf2f7;
    --sidebar-bg: #fcfdff;
    --chat-bg: #f8fbfe;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    background: var(--chat-bg);
    color: var(--dark-color);
    font-family: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
    font-size: 16px;
    line-height: 1.6;
}

a {
    color: inherit;
    text-decoration: none;
}

img {
    max-width: 100%;
}

button,
input,
select,
textarea {
    font: inherit;
}

input,
select,
textarea {
    width: 100%;
    padding: 0.8rem 0.95rem;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    background: #fff;
    color: var(--dark-color);
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

input:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: rgba(37, 99, 235, 0.45);
    box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.08);
}

button,
.button-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.78rem 1.05rem;
    border: 1px solid transparent;
    border-radius: 12px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: #fff;
    cursor: pointer;
    font-weight: 600;
}

.button-link-secondary {
    background: #fff;
    color: var(--dark-color);
    border-color: var(--border-color);
}

.button-link-danger {
    background: #fff;
    color: #ef4444;
    border-color: rgba(239, 68, 68, 0.24);
}

.docs-page {
    min-height: 100vh;
}

.docs-header {
    position: sticky;
    top: 0;
    z-index: 30;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(226, 232, 240, 0.8);
}

.docs-header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    width: min(1440px, calc(100% - 32px));
    margin: 0 auto;
    min-height: 68px;
    padding: 0.75rem 0;
}

.docs-brand {
    font-size: 1rem;
    font-weight: 700;
    color: var(--dark-color);
    white-space: nowrap;
}

.docs-search {
    width: min(420px, 100%);
}

.docs-search-wrap {
    position: relative;
    width: min(420px, 100%);
}

.docs-search-dropdown {
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    right: 0;
    z-index: 50;
    background: #fff;
    border: 1px solid var(--border-color);
    border-radius: 14px;
    box-shadow: 0 14px 30px rgba(15, 23, 42, 0.1);
    overflow: hidden;
}

.docs-search-result,
.docs-search-empty {
    display: block;
    padding: 12px 14px;
    border-top: 1px solid var(--border-color);
}

.docs-search-result:first-child,
.docs-search-empty:first-child {
    border-top: 0;
}

.docs-search-result:hover,
.docs-search-result.is-active {
    background: var(--primary-light);
}

.docs-search-result strong {
    display: block;
    margin-bottom: 2px;
    font-size: 0.95rem;
}

.docs-search-result small {
    display: block;
    color: var(--secondary-color);
    font-size: 0.82rem;
}

.docs-search-result p,
.docs-search-empty {
    margin: 4px 0 0;
    color: var(--secondary-color);
    font-size: 0.85rem;
    line-height: 1.45;
}

.docs-shell {
    display: grid;
    grid-template-columns: 280px minmax(0, 1fr) 240px;
    gap: 0;
    width: min(1440px, calc(100% - 32px));
    margin: 0 auto;
    min-height: calc(100vh - 68px);
}

.docs-sidebar,
.docs-rightbar {
    padding: 24px 0;
}

.docs-sidebar {
    border-right: 1px solid var(--border-color);
    padding-right: 20px;
}

.docs-rightbar {
    border-left: 1px solid var(--border-color);
    padding-left: 20px;
}

.docs-main {
    padding: 24px 32px 40px;
    min-width: 0;
    background: #ffffff;
}

.docs-nav {
    position: sticky;
    top: 92px;
    max-height: calc(100vh - 116px);
    overflow: auto;
}

.docs-nav-group + .docs-nav-group {
    margin-top: 20px;
}

.docs-nav-group-title {
    display: block;
    margin-bottom: 8px;
    font-size: 0.74rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--secondary-color);
}

.docs-nav-group-title.active,
.docs-nav-group-title:hover {
    color: var(--primary-color);
}

.docs-nav-items {
    display: grid;
    gap: 2px;
}

.docs-nav-item {
    display: block;
    padding: 7px 10px;
    border-radius: 10px;
    color: var(--secondary-color);
    font-size: 0.88rem;
}

.docs-nav-item:hover {
    background: rgba(37, 99, 235, 0.05);
    color: var(--dark-color);
}

.docs-nav-item.active {
    background: var(--primary-light);
    color: var(--primary-color);
    font-weight: 600;
}

.docs-content {
    min-width: 0;
}

.docs-article {
    max-width: 820px;
}

.docs-article-page {
    max-width: 760px;
    padding: 24px 28px;
    background: #ffffff;
    border-radius: 16px;
}

.docs-article-head {
    margin-bottom: 20px;
}

.docs-article-head h1,
.docs-article h1 {
    margin: 0 0 8px;
    font-size: 2rem;
    line-height: 1.2;
    font-weight: 700;
}

.muted {
    color: var(--secondary-color);
}

.docs-filters {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 20px;
}

.docs-filter {
    display: inline-flex;
    align-items: center;
    padding: 0.42rem 0.8rem;
    border-radius: 999px;
    border: 1px solid var(--border-color);
    background: #fff;
    color: var(--secondary-color);
    font-size: 0.92rem;
    font-weight: 500;
}

.docs-filter.active,
.docs-filter:hover {
    background: var(--primary-light);
    color: var(--primary-color);
    border-color: rgba(37, 99, 235, 0.18);
}

.docs-list {
    display: grid;
}

.docs-list-item {
    display: flex;
    justify-content: space-between;
    gap: 20px;
    padding: 14px 0;
    border-top: 1px solid var(--border-color);
}

.docs-list-item:first-child {
    border-top: 0;
    padding-top: 0;
}

.docs-list-item strong {
    display: block;
    margin-bottom: 4px;
    font-size: 1rem;
}

.docs-list-item p {
    margin: 0;
    color: var(--secondary-color);
    font-size: 0.95rem;
}

.docs-list-item small {
    color: var(--secondary-color);
    white-space: nowrap;
    font-size: 0.9rem;
}

.article-meta {
    display: flex;
    gap: 12px;
    align-items: center;
    margin-bottom: 12px;
    color: var(--secondary-color);
    font-size: 0.95rem;
}

.article-meta a {
    color: var(--primary-color);
    font-weight: 600;
}

.article-lead {
    margin: 0 0 22px;
    color: var(--secondary-color);
    font-size: 1.02rem;
}

.article-content h2 {
    margin-top: 2rem;
    margin-bottom: 0.75rem;
    font-size: 1.5rem;
    line-height: 1.3;
}

.article-content h3 {
    margin-top: 1.5rem;
    margin-bottom: 0.65rem;
    font-size: 1.2rem;
    line-height: 1.35;
}

.article-content p,
.article-content ul,
.article-content ol {
    margin: 0 0 1rem;
}

.article-content ul,
.article-content ol {
    padding-left: 1.25rem;
}

.article-content figure {
    margin: 1.25rem 0;
}

.article-content code {
    padding: 0.1rem 0.35rem;
    border-radius: 6px;
    background: var(--light-color);
    border: 1px solid var(--border-color);
    font-size: 0.92em;
}

.article-callout {
    margin: 1.1rem 0 1.3rem;
    padding: 0.95rem 1rem;
    border-radius: 12px;
    background: var(--light-color);
    border: 1px solid var(--border-color);
}

.docs-toc {
    position: sticky;
    top: 92px;
}

.docs-toc h2 {
    margin: 0 0 12px;
    font-size: 0.9rem;
    color: var(--secondary-color);
}

.docs-toc-list {
    display: grid;
    gap: 8px;
}

.docs-toc-item {
    color: var(--secondary-color);
    font-size: 0.84rem;
    line-height: 1.4;
}

.docs-toc-item:hover {
    color: var(--primary-color);
}

.docs-toc-item.level-3 {
    padding-left: 12px;
    font-size: 0.8rem;
}

.docs-flash-wrap {
    width: min(1440px, calc(100% - 32px));
    margin: 12px auto 0;
}

.flash {
    padding: 0.9rem 1rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    background: #fff;
}

.flash-success {
    color: #10b981;
}

.flash-error {
    color: #ef4444;
}

.empty-card {
    padding: 1rem;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    background: #fff;
    color: var(--secondary-color);
}

.admin-login-card,
.admin-table-wrap,
.editor-sidebar pre {
    background: #fff;
    border: 1px solid var(--border-color);
    border-radius: 18px;
    box-shadow: 0 4px 10px rgba(15, 23, 42, 0.04);
}

.admin-login-card {
    width: min(440px, 100%);
    padding: 1.2rem;
    margin: 2rem auto 0;
}

.admin-form,
.article-form {
    display: grid;
    gap: 1rem;
}

.admin-form label {
    display: grid;
    gap: 0.45rem;
    font-weight: 500;
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1rem;
}

.checkbox-row {
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

.checkbox-row input {
    width: auto;
}

.admin-toolbar,
.editor-tools,
.form-actions,
.section-heading {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}

.admin-filters {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 200px 160px;
    gap: 1rem;
    margin: 1rem 0;
}

.admin-table {
    width: 100%;
    border-collapse: collapse;
}

.admin-table th,
.admin-table td {
    padding: 0.95rem;
    text-align: left;
    vertical-align: top;
    border-top: 1px solid var(--border-color);
}

.admin-table thead th {
    border-top: 0;
    border-bottom: 1px solid var(--border-color);
    color: var(--secondary-color);
    font-weight: 600;
    font-size: 0.92rem;
}

.admin-table td small {
    display: block;
    color: var(--secondary-color);
    margin-top: 0.3rem;
}

.row-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.status-pill {
    display: inline-flex;
    align-items: center;
    padding: 0.3rem 0.6rem;
    border-radius: 999px;
    border: 1px solid var(--border-color);
    background: var(--light-color);
    color: var(--secondary-color);
    font-size: 0.85rem;
    font-weight: 600;
}

.editor-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 280px;
    gap: 1rem;
}

.tool-group {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.editor-tools button {
    padding: 0.55rem 0.8rem;
}

.upload-group input[type="file"] {
    display: none;
}

.editor-sidebar pre {
    padding: 1rem;
    margin: 0;
    white-space: pre-wrap;
    font-size: 0.92rem;
    color: var(--secondary-color);
}

@media (max-width: 1180px) {
    .docs-shell {
        grid-template-columns: 250px minmax(0, 1fr);
    }

    .docs-rightbar {
        display: none;
    }
}

@media (max-width: 900px) {
    .docs-shell,
    .editor-layout,
    .form-grid,
    .admin-filters {
        grid-template-columns: 1fr;
    }

    .docs-sidebar,
    .docs-rightbar {
        display: none;
    }

    .docs-main {
        padding-left: 0;
        padding-right: 0;
    }
}

@media (max-width: 700px) {
    .docs-header-inner,
    .docs-list-item,
    .admin-toolbar,
    .editor-tools,
    .form-actions,
    .section-heading {
        flex-direction: column;
        align-items: stretch;
    }

    .docs-header-inner,
    .docs-shell,
    .docs-flash-wrap {
        width: min(100% - 24px, 100%);
    }

    .docs-search-wrap {
        width: 100%;
    }
}