/* ── Keyword Network — base layout ───────────────────────────────────────── */

.kn-main {
    --kn-prompt-h: 104px;
    position: relative;
    width: 100%;
    height: calc(100vh - 56px);
    overflow: hidden;
    --kn-canvas-bg: #0a0e1a;
    --kn-canvas-text: #e0e8ff;
    --kn-muted-text: rgba(192, 208, 255, 0.62);
    --kn-label-shadow: #0a0e1a;
    --kn-label-glow: rgba(10, 14, 26, 0.95);
    --kn-label-lit-glow: rgba(255, 255, 255, 0.8);
    --kn-panel-bg: rgba(10, 14, 26, 0.9);
    --kn-panel-border: rgba(80, 140, 255, 0.2);
    --kn-input-bg: rgba(255, 255, 255, 0.06);
    --kn-input-border: rgba(80, 140, 255, 0.28);
    --kn-input-placeholder: rgba(192, 208, 255, 0.4);
    --kn-card-bg: rgba(15, 22, 48, 0.92);
    --kn-card-border: rgba(80, 140, 255, 0.3);
    --kn-card-shadow: rgba(80, 140, 255, 0.15);
    background: var(--kn-canvas-bg);
    color: var(--kn-canvas-text);
    /* Reserve space for the prompt bar (min 80px, grows with textarea) */
    padding-bottom: 80px;
}

[data-theme-palette="light"] .kn-main,
:root:not([data-theme-palette]) .kn-main {
    --kn-canvas-bg: #f8fafc;
    --kn-canvas-text: #172554;
    --kn-muted-text: rgba(51, 65, 85, 0.68);
    --kn-label-shadow: #ffffff;
    --kn-label-glow: rgba(255, 255, 255, 0.92);
    --kn-label-lit-glow: rgba(37, 99, 235, 0.34);
    --kn-panel-bg: rgba(248, 250, 252, 0.9);
    --kn-panel-border: rgba(37, 99, 235, 0.24);
    --kn-input-bg: rgba(255, 255, 255, 0.78);
    --kn-input-border: rgba(37, 99, 235, 0.32);
    --kn-input-placeholder: rgba(71, 85, 105, 0.58);
    --kn-card-bg: rgba(255, 255, 255, 0.92);
    --kn-card-border: rgba(37, 99, 235, 0.28);
    --kn-card-shadow: rgba(37, 99, 235, 0.18);
}

[data-theme-palette="sunrise"] .kn-main {
    --kn-canvas-bg: #fff7ed;
    --kn-canvas-text: #7c2d12;
    --kn-muted-text: rgba(124, 45, 18, 0.64);
    --kn-label-shadow: #fffaf2;
    --kn-label-glow: rgba(255, 250, 242, 0.94);
    --kn-label-lit-glow: rgba(234, 88, 12, 0.32);
    --kn-panel-bg: rgba(255, 247, 237, 0.9);
    --kn-panel-border: rgba(234, 88, 12, 0.24);
    --kn-input-bg: rgba(255, 250, 242, 0.8);
    --kn-input-border: rgba(234, 88, 12, 0.3);
    --kn-input-placeholder: rgba(124, 45, 18, 0.52);
    --kn-card-bg: rgba(255, 250, 242, 0.94);
    --kn-card-border: rgba(234, 88, 12, 0.26);
    --kn-card-shadow: rgba(234, 88, 12, 0.14);
}

[data-theme-palette="mint"] .kn-main {
    --kn-canvas-bg: #f2fbf7;
    --kn-canvas-text: #134e4a;
    --kn-muted-text: rgba(19, 78, 74, 0.62);
    --kn-label-shadow: #fcfffd;
    --kn-label-glow: rgba(252, 255, 253, 0.94);
    --kn-label-lit-glow: rgba(15, 118, 110, 0.3);
    --kn-panel-bg: rgba(242, 251, 247, 0.9);
    --kn-panel-border: rgba(15, 118, 110, 0.24);
    --kn-input-bg: rgba(252, 255, 253, 0.82);
    --kn-input-border: rgba(15, 118, 110, 0.28);
    --kn-input-placeholder: rgba(19, 78, 74, 0.52);
    --kn-card-bg: rgba(252, 255, 253, 0.94);
    --kn-card-border: rgba(15, 118, 110, 0.24);
    --kn-card-shadow: rgba(15, 118, 110, 0.12);
}

[data-theme-palette="sepia"] .kn-main {
    --kn-canvas-bg: #f7f1e5;
    --kn-canvas-text: #5c4025;
    --kn-muted-text: rgba(92, 64, 37, 0.62);
    --kn-label-shadow: #fffaf0;
    --kn-label-glow: rgba(255, 250, 240, 0.94);
    --kn-label-lit-glow: rgba(139, 94, 52, 0.3);
    --kn-panel-bg: rgba(247, 241, 229, 0.9);
    --kn-panel-border: rgba(139, 94, 52, 0.24);
    --kn-input-bg: rgba(255, 250, 240, 0.82);
    --kn-input-border: rgba(139, 94, 52, 0.28);
    --kn-input-placeholder: rgba(92, 64, 37, 0.52);
    --kn-card-bg: rgba(255, 250, 240, 0.94);
    --kn-card-border: rgba(139, 94, 52, 0.24);
    --kn-card-shadow: rgba(139, 94, 52, 0.12);
}

[data-theme-palette="dusk"] .kn-main {
    --kn-canvas-bg: #111827;
    --kn-panel-bg: rgba(17, 24, 39, 0.9);
    --kn-panel-border: rgba(196, 181, 253, 0.2);
    --kn-input-border: rgba(196, 181, 253, 0.28);
}

/* ── 3D graph canvas ──────────────────────────────────────────────────────── */

#kn-graph-container {
    position: absolute;
    inset: 0;
    bottom: 80px;
    width: 100%;
    background: var(--kn-canvas-bg);
}

#kn-graph-container canvas {
    display: block;
    width: 100% !important;
    height: 100% !important;
}

.kn-label-layer {
    position: absolute;
    inset: 0;
    z-index: 3;
    pointer-events: none;
    overflow: hidden;
}

.kn-node-label {
    position: absolute;
    top: 0;
    left: 0;
    max-width: 160px;
    padding: 0 0.1rem;
    font-size: 0.9rem;
    font-weight: 700;
    line-height: 1.15;
    text-align: center;
    white-space: nowrap;
    text-shadow:
        0 1px 2px var(--kn-label-shadow),
        0 -1px 2px var(--kn-label-shadow),
        1px 0 2px var(--kn-label-shadow),
        -1px 0 2px var(--kn-label-shadow),
        0 0 7px var(--kn-label-glow);
    transform-origin: center bottom;
    transition: color 0.15s ease, opacity 0.15s ease;
}

.kn-node-label.is-lit {
    text-shadow:
        0 1px 2px var(--kn-label-shadow),
        0 -1px 2px var(--kn-label-shadow),
        1px 0 2px var(--kn-label-shadow),
        -1px 0 2px var(--kn-label-shadow),
        0 0 10px var(--kn-label-lit-glow);
}

/* ── Empty state ──────────────────────────────────────────────────────────── */

.kn-empty-state {
    position: absolute;
    inset: 0;
    bottom: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    pointer-events: none;
    z-index: 5;
    transition: opacity 0.4s ease;
}

.kn-empty-state.hidden {
    opacity: 0;
    pointer-events: none;
}

.kn-empty-inner {
    max-width: 420px;
    padding: 2rem;
}

.kn-empty-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--kn-canvas-text);
    margin-bottom: 0.5rem;
}

.kn-empty-lead {
    font-size: 0.95rem;
    color: var(--kn-muted-text);
    margin: 0;
}

/* ── Node info card ───────────────────────────────────────────────────────── */

.kn-node-card {
    position: absolute;
    top: 1rem;
    right: 1rem;
    width: 260px;
    background: var(--kn-card-bg);
    border: 1px solid var(--kn-card-border);
    border-radius: 12px;
    padding: 1rem;
    backdrop-filter: blur(16px);
    box-shadow: 0 0 24px var(--kn-card-shadow);
    z-index: 20;
    animation: kn-card-in 0.2s ease;
}

@keyframes kn-card-in {
    from { opacity: 0; transform: translateY(-6px); }
    to   { opacity: 1; transform: translateY(0); }
}

.kn-card-label {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--kn-canvas-text);
    margin-bottom: 0.5rem;
    line-height: 1.3;
}

.kn-card-explanation {
    font-size: 0.8rem;
    color: var(--kn-muted-text);
    line-height: 1.5;
}

/* ── Hint bar ─────────────────────────────────────────────────────────────── */

.kn-hint {
    position: absolute;
    bottom: 88px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.72rem;
    color: var(--kn-muted-text);
    white-space: nowrap;
    z-index: 10;
    pointer-events: none;
    letter-spacing: 0.03em;
}

.kn-hint-sep {
    margin: 0 0.4rem;
    opacity: 0.4;
}

/* ── Prompt bar ───────────────────────────────────────────────────────────── */

.kn-prompt-bar {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    min-height: 80px;
    background: var(--kn-panel-bg);
    border-top: 1px solid var(--kn-panel-border);
    backdrop-filter: blur(16px);
    display: flex;
    align-items: flex-end;
    padding-bottom: 16px;
    z-index: 30;
}

.kn-prompt-inner {
    width: 100%;
    max-width: 720px;
    margin: 0 auto;
    padding: 0 1rem;
}

.kn-prompt-wrap {
    display: flex;
    gap: 0.5rem;
    align-items: flex-end;
}

.kn-prompt-input {
    flex: 1;
    background: var(--kn-input-bg);
    border: 1px solid var(--kn-input-border);
    border-radius: 10px;
    padding: 0.6rem 1rem;
    color: var(--kn-canvas-text);
    font-size: 0.9rem;
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s;
    min-height: 44px;
    max-height: 120px;
    resize: none;
    line-height: 1.5;
    overflow-y: auto;
}

.kn-prompt-input::placeholder {
    color: var(--kn-input-placeholder);
}

.kn-prompt-input:focus {
    border-color: rgba(80, 140, 255, 0.6);
    box-shadow: 0 0 0 3px rgba(80, 140, 255, 0.12);
}

.kn-prompt-btn {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0 1.1rem;
    height: 44px;
    background: linear-gradient(135deg, #3a6fff 0%, #5a3aff 100%);
    border: none;
    border-radius: 10px;
    color: #fff;
    font-size: 0.88rem;
    font-weight: 600;
    cursor: pointer;
    white-space: nowrap;
    transition: opacity 0.2s, transform 0.1s, box-shadow 0.2s;
    box-shadow: 0 0 16px rgba(58, 111, 255, 0.4);
}

.kn-prompt-btn:hover {
    opacity: 0.9;
    box-shadow: 0 0 24px rgba(58, 111, 255, 0.6);
}

.kn-prompt-btn:active { transform: scale(0.97); }

.kn-prompt-btn:disabled {
    opacity: 0.45;
    cursor: not-allowed;
    transform: none;
}

.kn-prompt-error {
    font-size: 0.78rem;
    color: #ff6b6b;
    margin-top: 0.25rem;
    padding-left: 0.25rem;
}

/* ── Bridge (loading) page ────────────────────────────────────────────────── */

.kn-bridge-page {
    --kn-bridge-bg: #0a0e1a;
    --kn-bridge-card-bg: rgba(15, 22, 48, 0.95);
    --kn-bridge-card-border: rgba(80, 140, 255, 0.2);
    background: var(--kn-bridge-bg);
}

[data-theme-palette="light"] .kn-bridge-page,
:root:not([data-theme-palette]) .kn-bridge-page {
    --kn-bridge-bg: #f8fafc;
    --kn-bridge-card-bg: rgba(255, 255, 255, 0.96);
    --kn-bridge-card-border: rgba(37, 99, 235, 0.2);
}

[data-theme-palette="sunrise"] .kn-bridge-page {
    --kn-bridge-bg: #fff7ed;
    --kn-bridge-card-bg: rgba(255, 250, 242, 0.96);
    --kn-bridge-card-border: rgba(234, 88, 12, 0.2);
}

[data-theme-palette="mint"] .kn-bridge-page {
    --kn-bridge-bg: #f2fbf7;
    --kn-bridge-card-bg: rgba(252, 255, 253, 0.96);
    --kn-bridge-card-border: rgba(15, 118, 110, 0.2);
}

[data-theme-palette="sepia"] .kn-bridge-page {
    --kn-bridge-bg: #f7f1e5;
    --kn-bridge-card-bg: rgba(255, 250, 240, 0.96);
    --kn-bridge-card-border: rgba(139, 94, 52, 0.2);
}

[data-theme-palette="dusk"] .kn-bridge-page {
    --kn-bridge-bg: #111827;
    --kn-bridge-card-bg: rgba(31, 35, 64, 0.95);
    --kn-bridge-card-border: rgba(196, 181, 253, 0.2);
}

.kn-bridge-shell {
    width: 100%;
}

.kn-bridge-center {
    background: var(--kn-bridge-card-bg) !important;
    border: 1px solid var(--kn-bridge-card-border) !important;
}

.kn-bridge-ad {
    min-height: 120px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.kn-bridge-ad .adsbygoogle {
    display: block;
    width: 100%;
    min-width: 250px;
}

.kn-loading-spinner {
    position: relative;
    width: 64px;
    height: 64px;
}

.kn-spinner-ring {
    width: 64px;
    height: 64px;
    border: 3px solid rgba(80, 140, 255, 0.15);
    border-top-color: #508cff;
    border-radius: 50%;
    animation: kn-spin 0.85s linear infinite;
}

@keyframes kn-spin {
    to { transform: rotate(360deg); }
}

.kn-loading-icon {
    font-size: 2.5rem;
}

.kn-loading-summary {
    color: rgba(80, 140, 255, 0.8);
    background: rgba(80, 140, 255, 0.08);
    border-radius: 6px;
    padding: 0.3rem 0.75rem;
}

/* ── P2-3 Layer badge on node labels ──────────────────────────────────────── */

.kn-node-label.kn-layer-0 {
    font-size: 1.0rem;
    font-weight: 800;
}

.kn-node-label.kn-layer-1 {
    font-size: 0.88rem;
    font-weight: 700;
}

.kn-node-label.kn-layer-2 {
    font-size: 0.78rem;
    font-weight: 600;
}

.kn-node-label.kn-layer-3 {
    font-size: 0.70rem;
    font-weight: 500;
    opacity: 0.88;
}

/* ── P2-2 Node card — web links section ───────────────────────────────────── */

.kn-node-card {
    max-height: 340px;
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--kn-card-border) transparent;
}

.kn-card-links {
    margin-top: 0.65rem;
    padding-top: 0.55rem;
    border-top: 1px solid var(--kn-card-border);
}

.kn-card-links-header {
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--kn-muted-text);
    margin-bottom: 0.4rem;
}

.kn-card-link-item {
    margin-bottom: 0.45rem;
}

.kn-card-link-item:last-child {
    margin-bottom: 0;
}

.kn-card-link-title {
    display: block;
    font-size: 0.78rem;
    font-weight: 600;
    color: #4cc9f0;
    text-decoration: none;
    line-height: 1.3;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

[data-theme-palette="light"] .kn-card-link-title,
:root:not([data-theme-palette]) .kn-card-link-title {
    color: #1d4ed8;
}

[data-theme-palette="sunrise"] .kn-card-link-title { color: #b45309; }
[data-theme-palette="mint"]    .kn-card-link-title { color: #0f766e; }
[data-theme-palette="sepia"]   .kn-card-link-title { color: #8b5e34; }

.kn-card-link-title:hover { text-decoration: underline; }

.kn-card-link-snippet {
    font-size: 0.72rem;
    color: var(--kn-muted-text);
    line-height: 1.4;
    margin-top: 0.15rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.kn-card-links-note {
    margin-top: 0.4rem;
    font-size: 0.67rem;
    color: var(--kn-muted-text);
    opacity: 0.7;
}

/* ── P3-2 Expand node button ──────────────────────────────────────────────── */

.kn-card-expand-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.35rem;
    width: 100%;
    margin-top: 0.65rem;
    padding: 0.42rem 0.75rem;
    background: transparent;
    border: 1px solid var(--kn-card-border);
    border-radius: 8px;
    color: var(--kn-muted-text);
    font-size: 0.78rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.18s, color 0.18s, border-color 0.18s;
}

.kn-card-expand-btn:hover:not(:disabled) {
    background: rgba(80, 140, 255, 0.10);
    border-color: rgba(80, 140, 255, 0.45);
    color: var(--kn-canvas-text);
}

.kn-card-expand-btn:disabled {
    opacity: 0.55;
    cursor: default;
}

/* ── P3-3 Trending keywords ───────────────────────────────────────────────── */

.kn-trending {
    margin-top: 1.25rem;
    pointer-events: auto;
}

.kn-trending-label {
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.07em;
    color: var(--kn-muted-text);
    margin-bottom: 0.55rem;
}

.kn-trending-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    justify-content: center;
}

.kn-trending-chip {
    display: inline-block;
    padding: 0.28rem 0.75rem;
    background: var(--kn-input-bg);
    border: 1px solid var(--kn-input-border);
    border-radius: 999px;
    color: var(--kn-canvas-text);
    font-size: 0.78rem;
    cursor: pointer;
    transition: background 0.18s, border-color 0.18s, box-shadow 0.18s;
    white-space: nowrap;
    max-width: 200px;
    overflow: hidden;
    text-overflow: ellipsis;
}

.kn-trending-chip:hover {
    background: rgba(80, 140, 255, 0.12);
    border-color: rgba(80, 140, 255, 0.50);
    box-shadow: 0 0 10px rgba(80, 140, 255, 0.18);
}

/* ── Page layout（主畫布 = main.kn-main，比照 ai-story-weaver .sw-main） ─ */

/* 與 views/footer.php 並存：#bv-app 直向 flex，主區填滿導覽列與頁尾之間空間 */
body:has(#bv-app > main.kn-main) #bv-app {
    flex: 1 1 auto;
    display: flex;
    flex-direction: column;
    min-height: 100svh;
}

body:has(#bv-app > main.kn-main) main.kn-main {
    flex: 1 1 auto;
    min-height: 0;
    height: auto;
}

.kn-bridge-page-inner {
    background: var(--kn-bridge-bg, #f8fafc);
}

/* 引導頁：移除頂部廣告後，三欄區塊於導覽列與頁尾之間垂直置中 */
body.ai-bridge-loading-page #bv-app,
body.kn-bridge-page #bv-app {
    flex: 1 1 auto;
    display: flex;
    flex-direction: column;
    min-height: 100svh;
}

body.ai-bridge-loading-page main.kn-bridge-page-inner,
main.kn-bridge-page-inner {
    flex: 1 1 auto;
    display: flex;
    flex-direction: column;
    justify-content: center;
    min-height: 0;
}

main.kn-bridge-page-inner .kn-bridge-shell {
    width: 100%;
}

.tool-top-ad.kn-bridge-ad-wrap {
    margin-bottom: 0;
}

#kn-render-error:not(.d-none) {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 100;
    background: rgba(200, 0, 0, 0.85);
    color: #fff;
    padding: 1.2rem 1.8rem;
    border-radius: 10px;
    font-size: 0.9rem;
    max-width: 420px;
    text-align: center;
    line-height: 1.6;
}

/* 說明側欄內：相關知識區（嵌入 rk-section） */
.kn-help-panel .rk-section {
    margin-top: 0 !important;
    padding-top: 0 !important;
}

.kn-faq-list .faq-item {
    margin-bottom: 12px;
    border-radius: 16px;
}

.kn-faq-list .faq-q {
    font-size: 0.9rem;
    padding: 14px 18px;
}

.kn-faq-list .faq-a {
    display: none;
    font-size: 0.86rem;
    line-height: 1.7;
    padding-top: 12px;
}

.kn-faq-list .faq-item.is-open .faq-a {
    display: block;
}

.kn-faq-list .faq-item .faq-q i {
    transition: transform 0.2s ease;
}

.kn-faq-list .faq-item.is-open .faq-q i {
    transform: rotate(180deg);
}

.kn-help-panel .rk-item {
    padding: 18px 0;
    margin: 0;
    border-radius: 0;
    background: transparent !important;
}

.kn-help-panel .rk-thumb {
    width: 84px;
    height: 84px;
    min-width: 84px;
    min-height: 84px;
    border-radius: 14px;
    align-self: flex-start;
}

.kn-help-panel .rk-thumb::after {
    background: rgba(0, 0, 0, 0.16);
}

.kn-help-panel .rk-thumb-icon {
    font-size: 1.45rem;
}

.kn-help-panel .rk-info > .d-flex {
    margin-bottom: 4px !important;
}

.kn-help-panel .rk-info > .d-flex > div:first-child,
.kn-help-panel .rk-tag {
    display: none !important;
}

.kn-help-panel .rk-title {
    font-size: 0.875rem;
    line-height: 1.35;
    margin-bottom: 6px;
}

.kn-help-panel .rk-excerpt {
    font-size: 0.77rem;
    line-height: 1.55;
}

.kn-help-panel .rk-date {
    margin-top: 8px;
    font-size: 0.88rem;
}

/* 說明側欄（?）：比照 ai-story-weaver .sw-help-panel */
.kn-help-toggle {
    width: 44px;
    height: 44px;
    border-radius: 10px;
    border: 1px solid var(--kn-input-border);
    background: var(--kn-input-bg);
    color: var(--kn-canvas-text);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    flex-shrink: 0;
    transition: border-color 0.2s ease, background 0.2s ease;
}

.kn-help-toggle:hover {
    border-color: rgba(80, 140, 255, 0.6);
}

.kn-help-toggle:focus-visible {
    outline: none;
    box-shadow: 0 0 0 3px rgba(80, 140, 255, 0.14);
}

.kn-help-panel {
    position: absolute;
    top: 0.9rem;
    right: 0.9rem;
    width: min(460px, calc(100vw - 2rem));
    max-height: calc(100% - var(--kn-prompt-h, 104px) - 1.1rem);
    z-index: 35;
    display: flex;
    flex-direction: column;
    background: var(--kn-card-bg);
    border: 1px solid var(--kn-card-border);
    border-radius: 16px;
    box-shadow: 0 16px 38px rgba(0, 0, 0, 0.24);
    backdrop-filter: blur(14px);
    color: var(--kn-canvas-text);
    transform: translateX(calc(100% + 1.4rem));
    opacity: 0;
    pointer-events: none;
    transition: transform 0.22s ease, opacity 0.22s ease;
}

.kn-main.kn-help-open .kn-help-panel {
    transform: translateX(0);
    opacity: 1;
    pointer-events: auto;
}

.kn-help-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.85rem 0.95rem;
    border-bottom: 1px solid var(--kn-card-border);
    flex-shrink: 0;
}

.kn-help-title {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--kn-canvas-text);
}

.kn-help-close {
    border: none;
    background: transparent;
    color: var(--kn-muted-text);
    width: 30px;
    height: 30px;
    border-radius: 8px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    line-height: 1;
}

.kn-help-close:hover {
    background: var(--kn-input-bg);
    color: var(--kn-canvas-text);
}

.kn-help-tabs {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0.35rem;
    padding: 0.75rem 0.85rem 0.65rem;
}

.kn-help-tab {
    border: 1px solid var(--kn-input-border);
    background: var(--kn-input-bg);
    color: var(--kn-muted-text);
    border-radius: 10px;
    font-size: 0.78rem;
    font-weight: 700;
    padding: 0.4rem 0.35rem;
    cursor: pointer;
    line-height: 1.2;
}

.kn-help-tab.is-active {
    color: var(--kn-canvas-text);
    border-color: rgba(80, 140, 255, 0.45);
    box-shadow: 0 0 0 1px rgba(80, 140, 255, 0.16) inset;
}

.kn-help-body {
    flex: 1;
    min-height: 0;
    display: flex;
    overflow: hidden;
    padding: 0 0.85rem 0.85rem;
}

.kn-help-pane {
    display: none;
    flex: 1;
    min-height: 0;
    overflow-x: hidden;
    overflow-y: scroll;
    scrollbar-gutter: stable;
    scrollbar-width: thin;
    scrollbar-color: rgba(80, 140, 255, 0.78) rgba(80, 140, 255, 0.14);
    padding-right: 0.2rem;
}

.kn-help-pane.is-active {
    display: block;
}

.kn-help-pane::-webkit-scrollbar {
    width: 10px;
}

.kn-help-pane::-webkit-scrollbar-track {
    background: rgba(80, 140, 255, 0.12);
    border-radius: 999px;
}

.kn-help-pane::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, rgba(80, 140, 255, 0.9), rgba(80, 140, 255, 0.55));
    border-radius: 999px;
    border: 2px solid rgba(10, 14, 26, 0.12);
}

@media (max-width: 991.98px) {
    .kn-help-panel {
        top: auto;
        bottom: calc(var(--kn-prompt-h, 104px) + 0.75rem);
        max-height: min(460px, calc(100% - var(--kn-prompt-h, 104px) - 4rem));
    }
}

@media (max-width: 767.98px) {
    .kn-help-panel {
        left: 0.75rem;
        right: 0.75rem;
        width: auto;
        transform: translateY(calc(100% + 1rem));
        bottom: calc(var(--kn-prompt-h, 104px) + 0.75rem);
        max-height: min(62vh, calc(100% - var(--kn-prompt-h, 104px) - 4rem));
    }

    .kn-main.kn-help-open .kn-help-panel {
        transform: translateY(0);
    }

    .kn-help-panel .rk-title {
        font-size: 1rem;
    }

    .kn-help-panel .rk-excerpt {
        font-size: 0.84rem;
    }
}

/* ── Responsive ───────────────────────────────────────────────────────────── */

@media (max-width: 480px) {
    .kn-prompt-btn span {
        display: none;
    }
    .kn-node-card {
        width: 200px;
        font-size: 0.85rem;
    }
}