:root {
    --brand: #4f46e5;
    --brand-dark: #4338ca;
    --brand-light: #eef2ff;
    --ink-900: #0f172a;
    --ink-700: #334155;
    --ink-500: #64748b;
    --ink-400: #94a3b8;
    --ink-200: #e2e8f0;
    --ink-100: #f1f5f9;
    --ink-50: #f8fafc;
    --white: #ffffff;
    --emerald: #059669;
    --emerald-bg: #ecfdf5;
    --amber: #b45309;
    --amber-bg: #fffbeb;
    --red: #dc2626;
    --red-bg: #fef2f2;
    --blue: #1d4ed8;
    --blue-bg: #eff6ff;
    --code-bg: #0f172a;
    --code-text: #e2e8f0;
    --sidebar-width: 290px;
    --toc-width: 220px;
    --header-height: 60px;
    --shadow-card: 0 1px 2px rgba(15, 23, 42, 0.06), 0 1px 3px rgba(15, 23, 42, 0.08);
    --radius: 10px;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family:
        -apple-system, BlinkMacSystemFont, 'Segoe UI', Inter, Roboto, Helvetica, Arial, sans-serif;
    color: var(--ink-900);
    background: var(--white);
    font-size: 15px;
    line-height: 1.65;
}

a {
    color: var(--brand);
    text-decoration: none;
}
a:hover {
    text-decoration: underline;
}

img {
    max-width: 100%;
}

/* ---------- Top header ---------- */
.top-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: var(--white);
    border-bottom: 1px solid var(--ink-200);
    display: flex;
    align-items: center;
    padding: 0 20px;
    z-index: 100;
    gap: 16px;
}

.brand-mark {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 17px;
    color: var(--ink-900);
    flex-shrink: 0;
}
.brand-mark .logo-box {
    width: 32px;
    height: 32px;
    border-radius: 8px;
    background: var(--brand);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 15px;
}
.brand-mark .ver-badge {
    font-weight: 500;
    font-size: 11px;
    color: var(--ink-500);
    background: var(--ink-100);
    padding: 2px 8px;
    border-radius: 999px;
    margin-left: 2px;
}

.menu-toggle {
    display: none;
    background: none;
    border: 1px solid var(--ink-200);
    border-radius: 8px;
    width: 36px;
    height: 36px;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    flex-shrink: 0;
}

.search-wrap {
    position: relative;
    flex: 1;
    max-width: 420px;
    margin: 0 auto;
}
.search-input {
    width: 100%;
    padding: 8px 14px 8px 36px;
    border-radius: 8px;
    border: 1px solid var(--ink-200);
    background: var(--ink-50);
    font-size: 13.5px;
    color: var(--ink-900);
}
.search-input:focus {
    outline: none;
    border-color: var(--brand);
    background: #fff;
}
.search-icon {
    position: absolute;
    left: 11px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--ink-400);
    pointer-events: none;
}
.search-results {
    position: absolute;
    top: calc(100% + 6px);
    left: 0;
    right: 0;
    background: #fff;
    border: 1px solid var(--ink-200);
    border-radius: 10px;
    box-shadow: 0 12px 32px rgba(15, 23, 42, 0.14);
    max-height: 420px;
    overflow-y: auto;
    display: none;
    z-index: 200;
}
.search-results.open {
    display: block;
}
.search-result-item {
    display: block;
    padding: 10px 14px;
    border-bottom: 1px solid var(--ink-100);
    cursor: pointer;
}
.search-result-item:last-child {
    border-bottom: none;
}
.search-result-item:hover,
.search-result-item.active {
    background: var(--brand-light);
}
.search-result-item .sr-title {
    font-weight: 600;
    font-size: 13.5px;
    color: var(--ink-900);
}
.search-result-item .sr-cat {
    font-size: 11px;
    color: var(--ink-500);
    text-transform: uppercase;
    letter-spacing: 0.03em;
}
.search-empty {
    padding: 16px;
    text-align: center;
    color: var(--ink-500);
    font-size: 13px;
}

.header-links {
    display: flex;
    align-items: center;
    gap: 14px;
    font-size: 13.5px;
    font-weight: 500;
    color: var(--ink-700);
    flex-shrink: 0;
}
.header-links a {
    color: var(--ink-700);
}
.header-links a:hover {
    color: var(--brand);
    text-decoration: none;
}

/* ---------- Layout shell ---------- */
.docs-shell {
    display: flex;
    padding-top: var(--header-height);
    min-height: 100vh;
}

.sidebar {
    width: var(--sidebar-width);
    flex-shrink: 0;
    position: fixed;
    top: var(--header-height);
    bottom: 0;
    left: 0;
    overflow-y: auto;
    border-right: 1px solid var(--ink-200);
    padding: 20px 12px 60px;
    background: var(--ink-50);
}

.sidebar-group {
    margin-bottom: 4px;
}
.sidebar-group-title {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 10px;
    font-size: 11.5px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--ink-500);
    cursor: pointer;
    border-radius: 6px;
    user-select: none;
}
.sidebar-group-title:hover {
    background: var(--ink-100);
}
.sidebar-group-title .chev {
    transition: transform 0.15s ease;
    color: var(--ink-400);
}
.sidebar-group.collapsed .chev {
    transform: rotate(-90deg);
}
.sidebar-group.collapsed .sidebar-links {
    display: none;
}

.sidebar-links {
    list-style: none;
    margin: 0;
    padding: 0;
}
.sidebar-links li a {
    display: block;
    padding: 7px 12px 7px 22px;
    font-size: 13.5px;
    color: var(--ink-700);
    border-radius: 7px;
    border-left: 2px solid transparent;
    margin: 1px 0;
}
.sidebar-links li a:hover {
    background: var(--ink-100);
    text-decoration: none;
    color: var(--ink-900);
}
.sidebar-links li a.active {
    background: var(--brand-light);
    color: var(--brand-dark);
    font-weight: 600;
    border-left-color: var(--brand);
}

.main-col {
    flex: 1;
    margin-left: var(--sidebar-width);
    display: flex;
    justify-content: center;
    min-width: 0;
}

.content-area {
    max-width: 780px;
    width: 100%;
    padding: 40px 44px 100px;
    min-width: 0;
}

.toc-col {
    width: var(--toc-width);
    flex-shrink: 0;
    padding: 40px 20px;
}
.toc-inner {
    position: sticky;
    top: calc(var(--header-height) + 24px);
}
.toc-title {
    font-size: 11.5px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--ink-500);
    margin-bottom: 10px;
}
.toc-list {
    list-style: none;
    margin: 0;
    padding: 0;
    border-left: 2px solid var(--ink-200);
}
.toc-list li a {
    display: block;
    padding: 5px 0 5px 14px;
    font-size: 12.5px;
    color: var(--ink-500);
    border-left: 2px solid transparent;
    margin-left: -2px;
}
.toc-list li a:hover,
.toc-list li a.active {
    color: var(--brand);
    border-left-color: var(--brand);
    text-decoration: none;
}
.toc-list li.toc-h3 a {
    padding-left: 26px;
    font-size: 12px;
}

/* ---------- Breadcrumbs ---------- */
.breadcrumbs {
    font-size: 13px;
    color: var(--ink-500);
    margin-bottom: 18px;
}
.breadcrumbs a {
    color: var(--ink-500);
}
.breadcrumbs .sep {
    margin: 0 6px;
    color: var(--ink-400);
}
.breadcrumbs .current {
    color: var(--ink-700);
    font-weight: 500;
}

/* ---------- Article typography ---------- */
.article h1 {
    font-size: 30px;
    font-weight: 800;
    margin: 0 0 6px;
    letter-spacing: -0.02em;
    color: var(--ink-900);
    scroll-margin-top: calc(var(--header-height) + 16px);
}
.article .article-lede {
    font-size: 16px;
    color: var(--ink-500);
    margin-bottom: 28px;
}
.article h2 {
    font-size: 21px;
    font-weight: 700;
    margin: 40px 0 14px;
    padding-top: 6px;
    border-top: 1px solid var(--ink-100);
    color: var(--ink-900);
    scroll-margin-top: calc(var(--header-height) + 16px);
}
.article h2:first-of-type {
    border-top: none;
    padding-top: 0;
}
.article h3 {
    font-size: 16.5px;
    font-weight: 700;
    margin: 26px 0 10px;
    color: var(--ink-900);
    scroll-margin-top: calc(var(--header-height) + 16px);
}
.article p {
    margin: 0 0 14px;
    color: var(--ink-700);
}
.article ul,
.article ol {
    margin: 0 0 16px;
    padding-left: 22px;
    color: var(--ink-700);
}
.article li {
    margin-bottom: 6px;
}
.article strong {
    color: var(--ink-900);
    font-weight: 600;
}
.article code:not(pre code) {
    background: var(--ink-100);
    color: var(--brand-dark);
    padding: 2px 6px;
    border-radius: 5px;
    font-size: 0.87em;
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

/* ---------- Code blocks ---------- */
.code-block {
    position: relative;
    margin: 0 0 18px;
    border-radius: var(--radius);
    overflow: hidden;
    background: var(--code-bg);
}
.code-block .code-label {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 14px;
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: #94a3b8;
    background: rgba(255, 255, 255, 0.04);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}
.code-block pre {
    margin: 0;
    padding: 16px;
    overflow-x: auto;
}
.code-block code {
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    font-size: 13px;
    color: var(--code-text);
    line-height: 1.6;
    white-space: pre;
}
.copy-btn {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.14);
    color: #cbd5e1;
    font-size: 11px;
    padding: 3px 9px;
    border-radius: 6px;
    cursor: pointer;
    font-family: inherit;
}
.copy-btn:hover {
    background: rgba(255, 255, 255, 0.16);
}
.copy-btn.copied {
    background: var(--emerald);
    border-color: var(--emerald);
    color: #fff;
}

/* ---------- Tables ---------- */
.article table {
    width: 100%;
    border-collapse: collapse;
    margin: 0 0 20px;
    font-size: 13.5px;
    display: block;
    overflow-x: auto;
}
.article th {
    text-align: left;
    background: var(--ink-50);
    color: var(--ink-700);
    font-weight: 700;
    padding: 9px 12px;
    border: 1px solid var(--ink-200);
    white-space: nowrap;
}
.article td {
    padding: 9px 12px;
    border: 1px solid var(--ink-200);
    color: var(--ink-700);
    vertical-align: top;
}
.article tr:nth-child(even) td {
    background: var(--ink-50);
}

/* ---------- Callout boxes ---------- */
.callout {
    border-radius: var(--radius);
    padding: 14px 16px;
    margin: 0 0 18px;
    font-size: 14px;
    border: 1px solid;
    display: flex;
    gap: 10px;
}
.callout .callout-icon {
    flex-shrink: 0;
    font-size: 16px;
    line-height: 1.4;
}
.callout .callout-body p:last-child {
    margin-bottom: 0;
}
.callout-info {
    background: var(--blue-bg);
    border-color: #bfdbfe;
    color: #1e3a8a;
}
.callout-tip {
    background: var(--emerald-bg);
    border-color: #a7f3d0;
    color: #065f46;
}
.callout-warning {
    background: var(--amber-bg);
    border-color: #fde68a;
    color: #78350f;
}
.callout-danger {
    background: var(--red-bg);
    border-color: #fecaca;
    color: #7f1d1d;
}

/* ---------- Steps ---------- */
.steps {
    counter-reset: step;
    margin: 0 0 20px;
    padding: 0;
    list-style: none;
}
.steps > li {
    position: relative;
    padding: 2px 0 20px 40px;
    border-left: 2px solid var(--ink-200);
    margin-left: 15px;
}
.steps > li:last-child {
    border-left-color: transparent;
    padding-bottom: 0;
}
.steps > li::before {
    counter-increment: step;
    content: counter(step);
    position: absolute;
    left: -15px;
    top: 0;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    background: var(--brand);
    color: #fff;
    font-weight: 700;
    font-size: 13px;
    display: flex;
    align-items: center;
    justify-content: center;
}
.steps > li .step-title {
    font-weight: 700;
    font-size: 15px;
    color: var(--ink-900);
    margin-bottom: 4px;
}
.steps > li p {
    margin-bottom: 8px;
}

/* ---------- Badges / pills ---------- */
.pill {
    display: inline-block;
    padding: 2px 9px;
    border-radius: 999px;
    font-size: 11.5px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.02em;
}
.pill-get {
    background: var(--emerald-bg);
    color: var(--emerald);
}
.pill-post {
    background: var(--blue-bg);
    color: var(--blue);
}
.pill-patch {
    background: var(--amber-bg);
    color: var(--amber);
}
.pill-delete {
    background: var(--red-bg);
    color: var(--red);
}
.pill-gray {
    background: var(--ink-100);
    color: var(--ink-500);
}

/* ---------- Screenshot placeholder ---------- */
.screenshot-placeholder {
    border: 1.5px dashed var(--ink-200);
    border-radius: var(--radius);
    background: var(--ink-50);
    padding: 40px 20px;
    text-align: center;
    color: var(--ink-400);
    font-size: 13px;
    margin: 0 0 20px;
}
.screenshot-placeholder .ph-icon {
    font-size: 26px;
    margin-bottom: 8px;
    display: block;
}

/* ---------- Details / expandable ---------- */
.article details {
    border: 1px solid var(--ink-200);
    border-radius: var(--radius);
    margin: 0 0 14px;
    padding: 0;
    overflow: hidden;
}
.article summary {
    padding: 12px 16px;
    font-weight: 600;
    cursor: pointer;
    background: var(--ink-50);
    list-style: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.article summary::-webkit-details-marker {
    display: none;
}
.article summary::after {
    content: '+';
    font-size: 18px;
    color: var(--ink-400);
}
.article details[open] summary::after {
    content: '\2212';
}
.article details .details-body {
    padding: 14px 16px;
    border-top: 1px solid var(--ink-200);
}
.article details .details-body p:last-child {
    margin-bottom: 0;
}

/* ---------- Prev/Next footer ---------- */
.article-nav {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    margin-top: 50px;
    padding-top: 24px;
    border-top: 1px solid var(--ink-200);
}
.article-nav a {
    flex: 1;
    max-width: 48%;
    border: 1px solid var(--ink-200);
    border-radius: var(--radius);
    padding: 14px 16px;
    text-decoration: none;
    transition: border-color 0.15s;
}
.article-nav a:hover {
    border-color: var(--brand);
    text-decoration: none;
}
.article-nav .nav-dir {
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--ink-400);
    display: block;
    margin-bottom: 3px;
}
.article-nav .nav-title {
    font-weight: 600;
    color: var(--ink-900);
    font-size: 14px;
}
.article-nav .nav-next {
    text-align: right;
    margin-left: auto;
}

/* ---------- Home page ---------- */
.home-hero {
    background: linear-gradient(180deg, var(--brand-light) 0%, #fff 100%);
    margin: -40px -44px 36px;
    padding: 56px 44px 40px;
    border-bottom: 1px solid var(--ink-100);
    text-align: center;
}
.home-hero .eyebrow {
    font-size: 12.5px;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--brand);
    margin-bottom: 10px;
}
.home-hero h1 {
    font-size: 36px;
    margin: 0 0 12px;
    letter-spacing: -0.02em;
}
.home-hero p {
    font-size: 16px;
    color: var(--ink-500);
    max-width: 560px;
    margin: 0 auto 22px;
}
.home-hero .hero-actions {
    display: flex;
    gap: 12px;
    justify-content: center;
}
.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 20px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 14px;
    cursor: pointer;
    border: 1px solid transparent;
}
.btn-primary {
    background: var(--brand);
    color: #fff;
}
.btn-primary:hover {
    background: var(--brand-dark);
    text-decoration: none;
    color: #fff;
}
.btn-secondary {
    background: #fff;
    color: var(--ink-700);
    border-color: var(--ink-200);
}
.btn-secondary:hover {
    border-color: var(--ink-400);
    text-decoration: none;
    color: var(--ink-900);
}

.quick-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 14px;
    margin: 0 0 30px;
}
.quick-card {
    display: block;
    border: 1px solid var(--ink-200);
    border-radius: var(--radius);
    padding: 16px 18px;
    text-decoration: none;
    transition:
        border-color 0.15s,
        box-shadow 0.15s;
}
.quick-card:hover {
    border-color: var(--brand);
    box-shadow: var(--shadow-card);
    text-decoration: none;
}
.quick-card .qc-icon {
    font-size: 20px;
    margin-bottom: 8px;
    display: block;
}
.quick-card .qc-title {
    font-weight: 700;
    color: var(--ink-900);
    font-size: 14px;
    margin-bottom: 3px;
}
.quick-card .qc-desc {
    font-size: 12.5px;
    color: var(--ink-500);
    line-height: 1.5;
}

.stat-row {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
    margin: 0 0 34px;
}
.stat-box {
    text-align: center;
    padding: 16px 10px;
    border: 1px solid var(--ink-200);
    border-radius: var(--radius);
    background: var(--ink-50);
}
.stat-box .stat-value {
    font-size: 20px;
    font-weight: 800;
    color: var(--brand);
}
.stat-box .stat-label {
    font-size: 11.5px;
    color: var(--ink-500);
    margin-top: 2px;
}

.footer-note {
    text-align: center;
    color: var(--ink-400);
    font-size: 12.5px;
    margin-top: 60px;
    padding-top: 20px;
    border-top: 1px solid var(--ink-100);
}

/* ---------- Mobile ---------- */
.sidebar-backdrop {
    display: none;
}

@media (max-width: 1180px) {
    .toc-col {
        display: none;
    }
}

@media (max-width: 880px) {
    .menu-toggle {
        display: flex;
    }
    .brand-mark .ver-badge {
        display: none;
    }
    .header-links {
        display: none;
    }
    .top-header {
        padding: 0 12px;
        gap: 10px;
    }
    .brand-mark {
        font-size: 0;
    }
    .brand-mark .logo-box {
        font-size: 15px;
    }
    .search-wrap {
        max-width: none;
    }
    .sidebar {
        transform: translateX(-100%);
        transition: transform 0.2s ease;
        z-index: 150;
        box-shadow: 8px 0 24px rgba(0, 0, 0, 0.12);
    }
    .sidebar.open {
        transform: translateX(0);
    }
    .sidebar-backdrop.open {
        display: block;
        position: fixed;
        inset: 0;
        top: var(--header-height);
        background: rgba(15, 23, 42, 0.4);
        z-index: 140;
    }
    .main-col {
        margin-left: 0;
    }
    .content-area {
        padding: 26px 20px 80px;
    }
    .home-hero {
        margin: -26px -20px 28px;
        padding: 40px 20px 30px;
    }
    .home-hero h1 {
        font-size: 26px;
    }
    .quick-grid {
        grid-template-columns: 1fr 1fr;
    }
    .stat-row {
        grid-template-columns: 1fr 1fr;
    }
    .article-nav {
        flex-direction: column;
    }
    .article-nav a {
        max-width: 100%;
    }
}

@media (max-width: 520px) {
    .quick-grid {
        grid-template-columns: 1fr;
    }
}