:root {
    --brand-primary: #76ff8d;
    --brand-dark: #56d87a;
    --brand-light: rgba(118, 255, 141, .15);
    --bg-page: #3d4c37;
    --bg-surface: #4a5a44;
    --bg-sidebar: #38473200;
    --bg-inline: #556050;
    --bg-tip: #3a5a3a;
    --bg-note: #3a4a5a;
    --bg-warn: #5a4a2a;
    --bg-danger: #5a3a3a;
    --warn: #f59e0b;
    --info: #3b82f6;
    --error: #ef4444;
    --success: #10b981;
    --text-primary: #f0f6fc;
    --text-secondary: #c8dfc0;
    --text-muted: #8aaa80;
    --text-inline: #76ff8d;
    --text-link: #76ff8d;
    --border: #556050;
    --sidebar-w: 260px;
    --header-h: 58px;
    --content-max: 880px;
    --radius: 8px;
    --radius-sm: 4px;
    --shadow: 0 1px 3px rgba(0, 0, 0, .3), 0 1px 2px rgba(0, 0, 0, .2);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, .25), 0 2px 4px rgba(0, 0, 0, .2);
    color-scheme: dark;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
    scroll-padding-top: calc(var(--header-h) + 16px);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans", Helvetica, Arial, sans-serif;
    font-size: 1rem;
    line-height: 1.7;
    color: var(--text-primary);
    background: var(--bg-page);
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(8px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-h);
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    padding: 0 1.25rem;
    gap: 1rem;
    z-index: 100;
    box-shadow: var(--shadow);
}

.site-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
    font-weight: 700;
    font-size: 1.15rem;
    color: var(--brand-primary);
    white-space: nowrap;
}

.site-logo:hover {
    color: var(--brand-dark);
    text-decoration: none;
}

.site-header-spacer {
    flex: 1;
}

.sidebar-toggle {
    display: none;
    background: none;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 0.3rem 0.55rem;
    cursor: pointer;
    color: var(--text-primary);
    font-size: 1.1rem;
    line-height: 1;
}

.site-body {
    display: flex;
    margin-top: var(--header-h);
    min-height: calc(100vh - var(--header-h));
}

.sidebar {
    width: var(--sidebar-w);
    min-width: var(--sidebar-w);
    background: var(--bg-sidebar);
    border-right: 1px solid var(--border);
    height: calc(100vh - var(--header-h));
    position: sticky;
    top: var(--header-h);
    overflow-y: auto;
    padding: 1rem 0;
    scrollbar-width: thin;
    scrollbar-color: var(--border) transparent;
}

.sidebar-group-title {
    padding: 0.5rem 1.1rem 0.25rem;
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .07em;
    color: var(--text-muted);
}

.sidebar a {
    display: block;
    padding: 0.38rem 1.1rem 0.38rem 1.3rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
    text-decoration: none;
    border-left: 2px solid transparent;
    transition: color .12s, background .12s, border-color .12s;
    line-height: 1.4;
}

.sidebar a:hover {
    color: var(--text-primary);
    background: var(--bg-inline);
    text-decoration: none;
}

.sidebar a.active {
    color: var(--brand-primary);
    border-left-color: var(--brand-primary);
    background: var(--brand-light);
    font-weight: 600;
}

.content {
    flex: 1;
    min-width: 0;
    padding: 2.5rem 2.5rem 4rem;
}

.content-inner {
    max-width: var(--content-max);
    margin: 0 auto;
}

h1,
h2,
h3,
h4 {
    line-height: 1.25;
    font-weight: 700;
    color: var(--text-primary);
}

h1 {
    font-size: 2rem;
    margin-bottom: 0.6rem;
}

h2 {
    font-size: 1.4rem;
    margin-top: 2rem;
    margin-bottom: 0.6rem;
    padding-bottom: 0.3rem;
    border-bottom: 1px solid var(--border);
}

h3 {
    font-size: 1.1rem;
    margin-top: 1.4rem;
    margin-bottom: 0.4rem;
}

h4 {
    font-size: 1rem;
    margin-top: 1rem;
    margin-bottom: 0.3rem;
}

p {
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

p strong {
    color: var(--text-primary);
}

ul,
ol {
    margin: 0 0 1rem 1.5rem;
    color: var(--text-secondary);
}

li {
    margin-bottom: 0.3rem;
}

li strong {
    color: var(--text-primary);
}

a {
    color: var(--text-link);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

hr {
    border: none;
    border-top: 1px solid var(--border);
    margin: 2rem 0;
}

.page-header {
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border);
}

.page-header h1 {
    margin-bottom: 0.4rem;
}

.page-header p {
    font-size: 1.05rem;
    color: var(--text-secondary);
    margin: 0;
}

.breadcrumb {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 0.75rem;
    display: flex;
    gap: 0.4rem;
    align-items: center;
    flex-wrap: wrap;
}

.breadcrumb a {
    color: var(--text-muted);
}

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

code {
    font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
    font-size: 0.875em;
    background: var(--bg-inline);
    color: var(--text-inline);
    padding: 0.15em 0.4em;
    border-radius: var(--radius-sm);
}

.highlight {
    background: var(--bg-inline);
    padding: 0.9rem 1.1rem;
    border-radius: 0 var(--radius) var(--radius) 0;
    border-left: 4px solid var(--brand-primary);
    margin: 1rem 0;
    font-size: 0.925rem;
    color: var(--text-secondary);
}

.highlight strong {
    color: var(--text-primary);
    display: block;
    margin-bottom: 0.25rem;
}

.highlight ul,
.highlight ol {
    margin-bottom: 0;
}

.callout {
    border-radius: var(--radius);
    padding: 1rem 1.25rem;
    margin: 1.25rem 0;
    border-left: 4px solid;
    font-size: 0.925rem;
}

.callout p {
    margin: 0;
    color: inherit;
}

.callout p+p {
    margin-top: 0.5rem;
}

.callout strong {
    display: block;
    margin-bottom: 0.3rem;
    font-size: 0.8rem;
    letter-spacing: .05em;
    text-transform: uppercase;
}

.callout-tip {
    background: var(--bg-tip);
    border-color: #10b981;
    color: #065f46;
}

.callout-note {
    background: var(--bg-note);
    border-color: #3b82f6;
    color: #1e40af;
}

.callout-warn {
    background: var(--bg-warn);
    border-color: #f59e0b;
    color: #78350f;
}

.callout-danger {
    background: var(--bg-danger);
    border-color: #ef4444;
    color: #7f1d1d;
}

@media (prefers-color-scheme: dark) {
    .callout-tip {
        color: #6ee7b7;
    }

    .callout-note {
        color: #93c5fd;
    }

    .callout-warn {
        color: #fcd34d;
    }

    .callout-danger {
        color: #fca5a5;
    }
}

.doc-section {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.75rem 2rem;
    margin-bottom: 1.25rem;
    box-shadow: var(--shadow);
    animation: fadeIn .35s ease;
}

.doc-section h2 {
    margin-top: 0;
    border-bottom: none;
    padding-bottom: 0;
}

.doc-section h3 {
    color: var(--text-primary);
}

.doc-section p,
.doc-section li {
    color: var(--text-secondary);
}

.doc-section ul,
.doc-section ol {
    padding-left: 1.25rem;
}

.table-wrap {
    overflow-x: auto;
    margin: 1.25rem 0;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
    background: var(--bg-surface);
}

thead tr {
    background: var(--bg-sidebar);
}

th {
    text-align: left;
    padding: 0.65rem 1rem;
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: .04em;
    text-transform: uppercase;
    color: var(--text-secondary);
    border-bottom: 2px solid var(--border);
}

td {
    padding: 0.6rem 1rem;
    border-bottom: 1px solid var(--border);
    color: var(--text-secondary);
    vertical-align: top;
}

tbody tr:last-child td {
    border-bottom: none;
}

tbody tr:hover td {
    background: var(--bg-inline);
}

.page-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 3rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border);
    gap: 1rem;
}

.btn-nav {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.55rem 1.1rem;
    border-radius: var(--radius);
    font-size: 0.875rem;
    font-weight: 500;
    text-decoration: none;
    color: var(--text-secondary);
    background: var(--bg-surface);
    border: 1px solid var(--border);
    transition: color .15s, border-color .15s, background .15s;
}

.btn-nav:hover {
    color: var(--text-primary);
    border-color: var(--brand-primary);
    background: var(--brand-light);
    text-decoration: none;
}

.btn-nav.next {
    margin-left: auto;
}

.hero {
    text-align: center;
    padding: 5rem 2rem 3rem;
    animation: fadeIn .5s ease;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 0.8rem;
}

.hero p {
    font-size: 1.2rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 1.5rem;
}

.hero-icon {
    font-size: 3.5rem;
    display: block;
    margin-bottom: 0.75rem;
}

.hero-badge {
    display: inline-block;
    background: var(--bg-inline);
    color: var(--text-muted);
    padding: 0.3rem 0.9rem;
    border-radius: 99px;
    font-size: 0.82rem;
    margin-bottom: 1.5rem;
    border: 1px solid var(--border);
}

.btn-invite {
    display: inline-block;
    background: var(--bg-surface);
    color: #fff !important;
    padding: 0.7rem 1.8rem;
    border-radius: var(--radius);
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none !important;
    transition: background .15s, transform .15s;
}

.btn-invite:hover {
    /* background: var(--brand-dark); */
    outline: 1px solid var(--brand-primary);
    transform: translateY(-2px);
}

.section-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1.25rem;
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 1.5rem 4rem;
}

.section-card {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.75rem;
    text-decoration: none;
    color: inherit;
    transition: transform .15s, box-shadow .15s, border-color .15s;
    box-shadow: var(--shadow);
    display: block;
    animation: fadeIn .35s ease;
}

.section-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    border-color: var(--brand-primary);
    text-decoration: none;
    color: inherit;
}

.card-icon {
    font-size: 2.2rem;
    margin-bottom: 0.75rem;
    display: block;
}

.card-title {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 0.4rem;
    color: var(--text-primary);
}

.card-desc {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin: 0;
    line-height: 1.55;
}

.feature-strip {
    border-top: 1px solid var(--border);
    padding: 3rem 2rem;
    text-align: center;
}

.feature-strip-inner {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 3rem;
    max-width: 820px;
    margin: 0 auto;
}

.feature-strip-item {
    flex: 1;
    min-width: 150px;
}

.feature-strip-item .fi-icon {
    font-size: 2rem;
    margin-bottom: 0.4rem;
}

.feature-strip-item strong {
    display: block;
    margin-bottom: 0.2rem;
    color: var(--text-primary);
    font-size: 0.95rem;
}

.feature-strip-item span {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.site-footer {
    border-top: 1px solid var(--border);
    padding: 1.5rem;
    text-align: center;
    font-size: 0.82rem;
    color: var(--text-muted);
}

.site-footer a {
    color: var(--text-muted);
}

.site-footer a:hover {
    color: var(--text-link);
    text-decoration: none;
}

@media (max-width: 900px) {
    .sidebar {
        position: fixed;
        left: -280px;
        top: var(--header-h);
        height: calc(100vh - var(--header-h));
        z-index: 90;
        transition: left .25s cubic-bezier(.4, 0, .2, 1);
    }

    .sidebar.open {
        left: 0;
        box-shadow: 4px 0 24px rgba(0, 0, 0, .18);
    }

    .sidebar-toggle {
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .content {
        padding: 1.5rem 1.25rem 3rem;
    }

    .sidebar-backdrop {
        display: none;
        position: fixed;
        inset: 0;
        background: rgba(0, 0, 0, .3);
        z-index: 80;
    }

    .sidebar-backdrop.open {
        display: block;
    }
}

@media (max-width: 600px) {
    h1 {
        font-size: 1.65rem;
    }

    h2 {
        font-size: 1.25rem;
    }

    .hero h1 {
        font-size: 2.2rem;
    }

    .section-cards {
        grid-template-columns: 1fr;
        padding: 0 1rem 3rem;
    }

    .page-nav {
        flex-direction: column;
    }

    .btn-nav.next {
        margin-left: 0;
        align-self: flex-end;
    }
}

/* ── Search ─────────────────────────────────────────────────── */
.site-search {
    position: relative;
    margin-left: auto;
}

.site-search-input {
    background: var(--bg-inline);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text-primary);
    font-size: 0.875rem;
    padding: 0.35rem 0.75rem;
    width: 200px;
    outline: none;
    transition: border-color .15s, width .2s;
    font-family: inherit;
}

.site-search-input::placeholder {
    color: var(--text-muted);
}

.site-search-input:focus {
    border-color: var(--brand-primary);
    width: 260px;
}

.site-search-dropdown {
    position: absolute;
    top: calc(100% + 6px);
    right: 0;
    width: 320px;
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow-md);
    z-index: 200;
    overflow: hidden;
    display: none;
    animation: fadeIn .15s ease;
}

.site-search-dropdown.open {
    display: block;
}

.search-result {
    display: flex;
    flex-direction: column;
    padding: 0.6rem 1rem;
    text-decoration: none;
    color: var(--text-primary);
    border-bottom: 1px solid var(--border);
    font-size: 0.875rem;
    transition: background .1s;
    cursor: pointer;
}

.search-result:last-child {
    border-bottom: none;
}

.search-result:hover,
.search-result.focused {
    background: var(--bg-inline);
    text-decoration: none;
    color: var(--text-primary);
}

.search-result-title {
    font-weight: 600;
    color: var(--brand-primary);
}

.search-result-section {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 0.1rem;
}

.search-result-snippet {
    font-size: 0.78rem;
    color: var(--text-muted);
    margin-top: 0.2rem;
    line-height: 1.4;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.search-empty {
    padding: 0.75rem 1rem;
    font-size: 0.875rem;
    color: var(--text-muted);
    text-align: center;
}

@media (max-width: 600px) {
    .site-search-input {
        width: 130px;
    }

    .site-search-input:focus {
        width: 160px;
    }

    .site-search-dropdown {
        width: 260px;
    }
}