/* ─── KB Layout ─────────────────────────────────────────── */
.kb-wrap {
    display: flex;
    gap: 0;
    min-height: calc(100vh - 64px);
    align-items: flex-start;
}

/* ─── Sidebar ───────────────────────────────────────────── */
.kb-sidebar {
    width: 260px;
    min-width: 220px;
    flex-shrink: 0;
    background: var(--bg-secondary, #1e1e2e);
    border-right: 1px solid var(--border-color, #2a2a3e);
    padding: 1.25rem 0 2rem;
    position: sticky;
    top: 64px;
    max-height: calc(100vh - 64px);
    overflow-y: auto;
}

/* ─── Region switcher ───────────────────────────────────── */
.kb-region-bar {
    display: flex;
    gap: 6px;
    padding: 0 1rem 1rem;
    border-bottom: 1px solid var(--border-color, #2a2a3e);
    margin-bottom: 0.75rem;
}
.kb-region-btn {
    flex: 1;
    padding: 5px 0;
    font-size: 0.78rem;
    font-weight: 600;
    border-radius: 6px;
    border: 1px solid var(--border-color, #2a2a3e);
    background: transparent;
    color: var(--text-secondary, #a0a0b8);
    cursor: pointer;
    transition: all 0.15s;
}
.kb-region-btn.active,
.kb-region-btn:hover {
    background: var(--primary-accent, #7c3aed);
    border-color: var(--primary-accent, #7c3aed);
    color: #fff;
}

/* ─── Language switcher ─────────────────────────────────── */
.kb-lang-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    padding: 0 0.9rem 0.9rem;
    border-bottom: 1px solid var(--border-color, #2a2a3e);
    margin-bottom: 0.75rem;
}
.kb-lang-btn {
    padding: 3px 8px;
    font-size: 0.75rem;
    border-radius: 5px;
    border: 1px solid var(--border-color, #2a2a3e);
    background: transparent;
    color: var(--text-secondary, #a0a0b8);
    cursor: pointer;
    transition: all 0.15s;
    white-space: nowrap;
}
.kb-lang-btn.active,
.kb-lang-btn:hover {
    background: var(--accent, #06b6d4);
    border-color: var(--accent, #06b6d4);
    color: #fff;
}
.kb-search {
    padding: 0 0.9rem 0.9rem;
    border-bottom: 1px solid var(--border-color, #2a2a3e);
    margin-bottom: 0.75rem;
}
.kb-search input {
    width: 100%;
    min-height: 36px;
    padding: 0.45rem 0.65rem;
    border: 1px solid var(--border-color, #2a2a3e);
    border-radius: 6px;
    background: var(--bg-primary, #171725);
    color: var(--text-primary, #e0e0f0);
    font-size: 0.8rem;
}
.kb-search input:focus {
    outline: 2px solid color-mix(in srgb, var(--primary-accent, #7c3aed) 45%, transparent);
    border-color: var(--primary-accent, #7c3aed);
}

/* ─── Nav tree ──────────────────────────────────────────── */
.kb-nav-group {
    margin-bottom: 0.25rem;
}
.kb-nav-section {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 7px 1rem;
    font-size: 0.78rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted, #6b6b88);
    cursor: pointer;
    user-select: none;
}
.kb-nav-section:hover { color: var(--text-secondary, #a0a0b8); }
.kb-nav-section .chevron {
    margin-left: auto;
    transition: transform 0.2s;
    font-size: 0.65rem;
}
.kb-nav-section.open .chevron { transform: rotate(90deg); }
.kb-nav-items { display: none; }
.kb-nav-section.open + .kb-nav-items { display: block; }

.kb-nav-link {
    display: block;
    padding: 6px 1rem 6px 2rem;
    font-size: 0.84rem;
    color: var(--text-secondary, #a0a0b8);
    text-decoration: none;
    border-left: 2px solid transparent;
    transition: all 0.12s;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.kb-nav-link:hover {
    color: var(--text-primary, #e0e0f0);
    background: var(--bg-hover, rgba(255,255,255,0.04));
}
.kb-nav-link.active {
    color: var(--primary-accent, #7c3aed);
    border-left-color: var(--primary-accent, #7c3aed);
    background: rgba(124,58,237,0.08);
}

/* ─── Content area ──────────────────────────────────────── */
.kb-content {
    flex: 1;
    min-width: 0;
    padding: 2rem 2.5rem 4rem;
    max-width: 860px;
}
.kb-article { display: none; animation: kb-fade-in 0.2s ease; }
.kb-article.visible { display: block; }
@keyframes kb-fade-in {
    from { opacity: 0; transform: translateY(6px); }
    to   { opacity: 1; transform: translateY(0); }
}
.lang-block { display: none; }
.lang-block.visible { display: block; }

/* ─── Article typography ────────────────────────────────── */
.lang-block h1 {
    font-size: 1.55rem;
    font-weight: 700;
    margin: 0 0 1.4rem;
    line-height: 1.3;
    color: var(--text-primary, #e0e0f0);
}
.lang-block h2 {
    font-size: 1.05rem;
    font-weight: 600;
    margin: 1.5rem 0 0.6rem;
    color: var(--text-primary, #e0e0f0);
}
.lang-block p {
    margin: 0 0 0.85rem;
    line-height: 1.65;
    color: var(--text-secondary, #c0c0d8);
}
.lang-block ul {
    margin: 0 0 0.85rem 1.1rem;
    padding: 0;
    color: var(--text-secondary, #c0c0d8);
}
.lang-block li { margin-bottom: 0.35rem; line-height: 1.55; }

/* ─── Steps ─────────────────────────────────────────────── */
.kb-step {
    display: flex;
    gap: 0.9rem;
    align-items: flex-start;
    margin-bottom: 0.75rem;
}
.kb-step-num {
    width: 26px;
    height: 26px;
    border-radius: 50%;
    background: var(--primary-accent, #7c3aed);
    color: #fff;
    font-size: 0.78rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    margin-top: 1px;
}
.kb-step-body {
    flex: 1;
    font-size: 0.9rem;
    line-height: 1.55;
    color: var(--text-secondary, #c0c0d8);
    padding-top: 3px;
}

/* ─── Callouts ──────────────────────────────────────────── */
.kb-callout {
    border-radius: 8px;
    padding: 0.7rem 1rem;
    margin: 1rem 0;
    font-size: 0.87rem;
    line-height: 1.55;
}
.kb-callout.tip  { background: rgba(6,182,212,0.1);  border-left: 3px solid #06b6d4; color: var(--text-secondary, #c0c0d8); }
.kb-callout.warn { background: rgba(251,191,36,0.1); border-left: 3px solid #fbbf24; color: var(--text-secondary, #c0c0d8); }
.kb-callout.key  { background: rgba(52,211,153,0.1); border-left: 3px solid #34d399; color: var(--text-secondary, #c0c0d8); }

/* ─── Screenshots ───────────────────────────────────────── */
.kb-figure {
    margin: 1.25rem 0 1.5rem;
}
.kb-figure img {
    display: block;
    width: 100%;
    height: auto;
    border: 1px solid var(--border-color, #2a2a3e);
    border-radius: 8px;
    box-shadow: 0 14px 32px rgba(0, 0, 0, 0.18);
}
.kb-figure figcaption {
    margin-top: 0.55rem;
    color: var(--text-muted, #6b6b88);
    font-size: 0.78rem;
    line-height: 1.45;
}

/* ─── Responsive ────────────────────────────────────────── */
@media (max-width: 768px) {
    .kb-wrap { flex-direction: column; }
    .kb-sidebar {
        width: 100%;
        min-width: unset;
        position: static;
        max-height: none;
        border-right: none;
        border-bottom: 1px solid var(--border-color, #2a2a3e);
    }
    .kb-content { padding: 1.25rem 1rem 3rem; }
    .kb-nav-link { white-space: normal; }
}
.kb-empty {
    padding: 4rem 2rem;
    text-align: center;
    color: var(--text-muted, #6b6b88);
    font-size: 0.95rem;
}

/* ─── Auth gate ─────────────────────────────────────────── */
.kb-auth-gate {
    margin: 3rem 0;
    padding: 2rem;
    background: var(--bg-secondary, #1e1e2e);
    border: 1px solid var(--primary-accent, #7c3aed);
    border-radius: 12px;
    text-align: center;
}
.kb-auth-gate h3 {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-primary, #e0e0f0);
    margin: 0 0 0.6rem;
}
.kb-auth-gate p {
    color: var(--text-secondary, #c0c0d8);
    font-size: 0.9rem;
    margin: 0 0 1.2rem;
}
.kb-auth-gate .btn-primary {
    display: inline-block;
    padding: 0.6rem 1.6rem;
    background: var(--primary-accent, #7c3aed);
    color: #fff;
    text-decoration: none;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.9rem;
    transition: opacity 0.15s;
}
.kb-auth-gate .btn-primary:hover { opacity: 0.85; }

/* ─── Locked nav items ───────────────────────────────────── */
.kb-nav-link.locked {
    opacity: 0.45;
    cursor: default;
    pointer-events: none;
}
.kb-nav-link.locked::after {
    content: ' 🔒';
    font-size: 0.7rem;
}