/*
 * System Design Playground page styles.
 * Moved out of page-system-design-playground.php (was ~40KB of inline <style>)
 * so browsers cache it; enqueued by the template with a filemtime version.
 */

/* ── Block 1 (moved from page-system-design-playground.php) ── */
/* ─── Hero ─────────────────────────────────────────────────────── */
.sdcp-hero {
    background: var(--sdc-bg-secondary);
    border-bottom: 1px solid var(--sdc-border);
    padding: 12px 0 10px;
}
.sdcp-hero__inner {
    display: flex;
    align-items: baseline;
    gap: 10px 16px;
    flex-wrap: wrap;
}
.sdcp-hero__title {
    font-size: 17px;
    font-weight: 700;
    line-height: 1.3;
    letter-spacing: -.01em;
    color: var(--sdc-text-primary);
    margin: 0;
    white-space: nowrap;
}
.sdcp-hero__accent { color: var(--sdc-primary); }
.sdcp-hero__sub {
    font-size: 12px;
    color: var(--sdc-text-tertiary);
    margin: 0;
    line-height: 1.4;
}

/* ─── Tabs with icons ───────────────────────────────────────────── */
.playground-page .playground-mode-tabs {
    display: flex;
    gap: 0;
    background: var(--sdc-bg-secondary);
    border: 1px solid var(--sdc-border);
    border-radius: 10px;
    padding: 4px;
    max-width: 1400px;
    margin: 0 auto 16px;
    width: calc(100% - 48px);
}
.playground-page .playground-mode-tab {
    flex: 1;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 7px;
    padding: 10px 16px;
    font-size: 13px;
    font-weight: 600;
    color: var(--sdc-text-tertiary);
    background: transparent;
    border: none;
    border-radius: 7px;
    cursor: pointer;
    transition: background .15s, color .15s;
    font-family: inherit;
}
.playground-page .playground-mode-tab__icon { flex-shrink: 0; }
.playground-page .playground-mode-tab__lock { opacity: .5; flex-shrink: 0; }
.playground-page .playground-mode-tab:hover:not(:disabled) {
    color: var(--sdc-text-primary);
    background: var(--sdc-bg-tertiary);
}
.playground-page .playground-mode-tab.is-active {
    color: var(--sdc-text-primary);
    background: var(--sdc-bg-primary);
    box-shadow: var(--sdc-shadow);
}
.playground-page .playground-mode-tab.is-active .playground-mode-tab__icon { color: var(--sdc-info); }
.playground-page .playground-mode-tab:focus-visible {
    outline: 2px solid var(--sdc-primary);
    outline-offset: 2px;
}
.playground-page .playground-mode-tab:disabled {
    opacity: .4;
    cursor: not-allowed;
}

/* ─── Playground section background ────────────────────────────── */
.playground-page .playground-section {
    background: var(--sdc-bg-secondary) !important;
    padding-top: 16px !important;
    padding-bottom: 32px !important;
}

/* ─── Sidebar ───────────────────────────────────────────────────── */
.playground-page .playground-sidebar {
    background: var(--sdc-bg-primary);
    border: 1px solid var(--sdc-border);
    border-radius: 10px;
    color: var(--sdc-text-primary);
}
.playground-page .playground-sidebar .playground-panel-title {
    font-size: 10px;
    font-weight: 700;
    letter-spacing: .1em;
    text-transform: uppercase;
    color: var(--sdc-text-light);
}
.playground-page .playground-sidebar .playground-control-group label,
.playground-page .playground-sidebar .playground-control-group label span {
    color: var(--sdc-text-tertiary);
    font-size: 12px;
}
.playground-page .playground-sidebar .playground-select {
    background: var(--sdc-bg-secondary);
    color: var(--sdc-text-primary);
    border: 1px solid var(--sdc-border);
    border-radius: 6px;
    padding: 8px 10px;
    font-size: 13px;
}
.playground-page .playground-sidebar .playground-select:focus {
    border-color: var(--sdc-primary);
    box-shadow: 0 0 0 3px rgba(var(--sdc-primary-rgb), .2);
    outline: none;
}
.playground-page .playground-sidebar .playground-select option {
    background: var(--sdc-bg-secondary);
    color: var(--sdc-text-primary);
}
.playground-page .playground-sidebar .playground-range {
    accent-color: var(--sdc-primary);
}
.playground-page .playground-sidebar .playground-color-input {
    width: 36px;
    height: 28px;
    border: 1px solid var(--sdc-border);
    border-radius: 4px;
    padding: 2px;
    background: var(--sdc-bg-secondary);
    cursor: pointer;
}
.playground-page .playground-panel-section {
    border-bottom: 1px solid var(--sdc-border);
}
.playground-page .playground-panel-section:last-child {
    border-bottom: none;
}
.playground-page .btn-primary {
    background: var(--sdc-primary);
    color: #fff;
    border: none;
    border-radius: 7px;
    padding: 8px 16px;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: background .15s;
}
.playground-page .btn-primary:hover { background: var(--sdc-primary-dark); }
.playground-page .btn-secondary {
    background: var(--sdc-bg-tertiary);
    color: var(--sdc-text-tertiary);
    border: 1px solid var(--sdc-border);
    border-radius: 7px;
    padding: 8px 16px;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: background .15s, color .15s;
}
.playground-page .btn-secondary:hover { background: var(--sdc-bg-secondary); color: var(--sdc-text-primary); }

/* ─── Viewport bar (IDE titlebar) ───────────────────────────────── */
.sdcp-viewport-bar {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 14px;
    background: var(--sdc-bg-secondary);
    border-bottom: 1px solid var(--sdc-border);
    border-radius: 10px 10px 0 0;
}
.sdcp-viewport-bar__dots {
    display: flex;
    gap: 5px;
}
.sdcp-viewport-bar__dots span {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: #ef4444;
}
.sdcp-viewport-bar__dots span:nth-child(2) { background: #f59e0b; }
.sdcp-viewport-bar__dots span:nth-child(3) { background: #10b981; }
.sdcp-viewport-bar__label {
    flex: 1;
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 12px;
    color: var(--sdc-text-light);
    font-family: ui-monospace, 'Cascadia Code', 'Fira Code', monospace;
    letter-spacing: .03em;
}
.sdcp-viewport-bar__label svg { color: var(--sdc-info); flex-shrink: 0; }
.sdcp-viewport-bar__actions { display: flex; gap: 4px; }
.sdcp-viewport-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border: 1px solid var(--sdc-border);
    background: transparent;
    border-radius: 5px;
    color: var(--sdc-text-light);
    cursor: pointer;
    transition: background .15s, color .15s;
}
.sdcp-viewport-btn:hover { background: var(--sdc-bg-tertiary); color: var(--sdc-text-tertiary); }

/* ─── SVG viewport ──────────────────────────────────────────────── */
.playground-page .playground-svg-card {
    border-radius: 10px;
    border: 1px solid var(--sdc-border);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    background: var(--sdc-bg-primary);
}
.playground-page .playground-svg-inner {
    background: var(--sdc-bg-primary);
    min-height: 420px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: auto;
    flex: 1;
}
.sdcp-empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 48px 24px;
    color: var(--sdc-text-light);
    font-size: 14px;
    text-align: center;
}
.sdcp-empty-state p { margin: 0; }
.playground-page .play-empty {
    color: var(--sdc-text-light);
    font-size: 14px;
    text-align: center;
    padding: 48px 24px;
    margin: 0;
}
.playground-page .play-loading {
    color: var(--sdc-info);
    font-size: 14px;
    text-align: center;
    padding: 48px 24px;
    margin: 0;
}
.playground-page .play-error {
    color: var(--sdc-danger);
    font-size: 14px;
    text-align: center;
    padding: 48px 24px;
    margin: 0;
}

/* ─── Fullscreen ────────────────────────────────────────────────── */
.sdcp-is-fullscreen {
    position: fixed !important;
    inset: 0 !important;
    z-index: 9999 !important;
    border-radius: 0 !important;
    width: 100% !important;
    height: 100% !important;
    max-height: none !important;
    border: none !important;
}
.sdcp-is-fullscreen .playground-svg-inner {
    min-height: 0;
    flex: 1;
    height: calc(100% - 45px);
}
.sdcp-body-fullscreen { overflow: hidden; }

/* ─── Video card ─────────────────────────────────────────────────── */
.playground-page .playground-video-card {
    border-radius: 10px;
    border: 1px solid var(--sdc-border);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    background: var(--sdc-bg-primary);
}
.playground-page .playground-video-inner {
    background: var(--sdc-bg-primary);
    min-height: 360px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex: 1;
}

/* ─── Video meta ─────────────────────────────────────────────────── */
.playground-page .playground-video-meta {
    background: var(--sdc-bg-secondary);
    border: 1px solid var(--sdc-border);
    border-radius: 8px;
    padding: 14px 16px;
    margin-top: 12px;
}
.playground-page .playground-video-meta-title {
    font-size: 14px;
    font-weight: 700;
    color: var(--sdc-text-primary);
    margin: 0 0 6px;
}
.playground-page .playground-video-meta-desc {
    font-size: 13px;
    color: var(--sdc-text-tertiary);
    margin: 0;
    line-height: 1.5;
}

/* ─── Questions grid ─────────────────────────────────────────────── */
.playground-page .playground-questions-card {
    background: var(--sdc-bg-secondary);
    border-radius: 10px;
    border: 1px solid var(--sdc-border);
    overflow: hidden;
}
.playground-page .playground-questions-inner {
    padding: 24px;
}
.playground-page .playground-questions-header { margin-bottom: 20px; }
.playground-page .playground-questions-title {
    font-size: 20px;
    font-weight: 700;
    color: var(--sdc-text-primary);
    margin: 0 0 6px;
}
.playground-page .playground-questions-subtitle {
    font-size: 14px;
    color: var(--sdc-text-tertiary);
    margin: 0;
}
.playground-page .playground-question-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 14px;
}
.playground-page .playground-question-card {
    background: var(--sdc-bg-primary);
    border: 1px solid var(--sdc-border);
    border-radius: 10px;
    padding: 16px;
    transition: border-color .15s, box-shadow .15s, transform .15s;
    cursor: pointer;
}
.playground-page .playground-question-card:hover {
    border-color: var(--sdc-border-dark);
    box-shadow: var(--sdc-shadow-md);
    transform: translateY(-2px);
}
.playground-page .playground-question-card:focus-visible {
    outline: none;
    border-color: var(--sdc-primary);
    box-shadow: 0 0 0 3px rgba(var(--sdc-primary-rgb), .25);
}
.playground-page .playground-question-title {
    font-size: 14px;
    font-weight: 700;
    color: var(--sdc-text-primary);
    margin: 0 0 8px;
    line-height: 1.4;
}
.playground-page .playground-question-instruction {
    font-size: 13px;
    color: var(--sdc-text-tertiary);
    margin: 0;
    line-height: 1.5;
}

/* ─── Sign-in gate ───────────────────────────────────────────────── */
.playground-page .playground-signin-gate {
    background: var(--sdc-bg-secondary);
    border: 1px solid var(--sdc-border);
    border-radius: 12px;
    padding: 40px 24px;
    text-align: center;
    max-width: 400px;
    margin: 0 auto;
}
.playground-page .playground-signin-gate-text {
    color: var(--sdc-text-tertiary);
    font-size: 14px;
    margin-bottom: 16px;
}
.playground-page .playground-questions-card .playground-signin-gate {
    background: transparent;
    border: none;
}
.playground-page .playground-q-results {
    color: var(--sdc-text-light);
    font-size: 12px;
    margin: 8px 0 0;
}
.playground-page .playground-q-results strong { color: var(--sdc-text-tertiary); }
.playground-page .playground-q-search {
    background: var(--sdc-bg-secondary);
    color: var(--sdc-text-primary);
    border: 1px solid var(--sdc-border);
    border-radius: 6px;
    padding: 7px 10px;
    font-size: 13px;
    width: 100%;
}
.playground-page .playground-q-search::placeholder { color: var(--sdc-text-light); }
.playground-page .playground-q-search:focus {
    border-color: var(--sdc-primary);
    box-shadow: 0 0 0 3px rgba(var(--sdc-primary-rgb), .2);
    outline: none;
}

/* ─── Responsive ─────────────────────────────────────────────────── */
@media (max-width: 767px) {
    .playground-page .playground-mode-tabs {
        width: calc(100% - 32px);
        gap: 2px;
    }
    .playground-page .playground-mode-tab { font-size: 12px; padding: 9px 10px; gap: 5px; }
    .playground-page .playground-mode-tab__icon { display: none; }
    .playground-page .playground-sidebar { border-radius: 10px; }
    .playground-page .playground-question-grid { grid-template-columns: 1fr; }
}

/* ── Block 2 (moved from page-system-design-playground.php) ── */
/* ── System Design Practice ─────────────────────────────────────── */
.sdp-panel-wrap { display:flex; flex-direction:column; min-height:580px; position:relative; flex:1; }
.playground-main-panel { overflow:hidden; }
.sdp-subtabs { display:flex; gap:0; border-bottom:1px solid var(--border-light,#e2e8f0); background:var(--background-primary,#fff); flex-shrink:0; }
.sdp-subtab { display:flex; align-items:center; gap:6px; padding:10px 16px; border:none; background:transparent; font-size:13px; font-weight:500; color:#64748b; cursor:pointer; border-bottom:2px solid transparent; margin-bottom:-1px; transition:color .15s,border-color .15s; }
.sdp-subtab:hover { color:#1e293b; }
.sdp-subtab--active { color:#2563eb; border-bottom-color:#2563eb; font-weight:600; }
.sdp-subtab:disabled,.sdp-subtab--locked { opacity:.45; cursor:not-allowed; pointer-events:none; }
.sdp-section { flex:1; display:flex; flex-direction:column; overflow:hidden; }
/* display:flex above beats the browser's default [hidden]{display:none}, which left the
   locked Practice canvas rendering underneath the Baseline canvas. */
.sdp-section[hidden] { display:none !important; }
.sdp-subtab__note { font-size:10px; font-weight:400; opacity:.8; margin-left:4px; }

/* Practice: component palette beside canvas (outside sdp-draw-wrap) */
.sdp-draw-workspace { flex:1; display:flex; flex-direction:row; min-height:0; overflow:hidden; }
.sdp-draw-canvas-col { flex:1; min-width:0; display:flex; flex-direction:column; overflow:hidden; }
.sdp-draw-tools-panel {
    flex-shrink:0; width:232px; display:flex; flex-direction:column; min-height:0;
    overflow-y:auto; border-right:1px solid var(--border-light,#e2e8f0);
    background:var(--background-primary,#fff); padding:12px 14px;
}
.sdp-draw-tools-panel[hidden] { display:none !important; }
.sdp-draw-tools-panel .playground-panel-title { margin:0 0 8px; }
.sdp-draw-tools-panel .sdp-palette { flex:1; min-height:0; max-height:none; margin-bottom:10px; overflow-y:auto; }
.sdp-draw-tools-panel .sdp-canvas-actions { flex-shrink:0; }
.sdp-draw-tools-hint { margin-top:8px; font-size:11px; flex-shrink:0; }
/* Hide empty left sidebar while Practice sub-tab is active */
.playground-layout:has(#playground-main-panel-design:not([hidden]) #sdp-section-draw:not([hidden])) .playground-sidebar-column {
    width:0; min-width:0; margin-right:0; overflow:hidden; opacity:0; pointer-events:none;
}
html[data-theme="dark"] .sdp-draw-tools-panel,
html.dark .sdp-draw-tools-panel { background:#0f172a; border-color:#334155; }

/* Baseline */
.sdp-baseline-sidebar-block { border-top:1px solid var(--sdc-border,#e2e8f0); margin-top:12px; padding-top:12px; }
.sdp-baseline-sidebar-block[hidden] { display:none !important; }
#sdp-sidebar-baseline .sdp-baseline-info-bar { padding:0; background:transparent; border-bottom:none; }
#sdp-sidebar-baseline .sdp-baseline-desc { max-width:none; }
#sdp-sidebar-baseline .sdp-baseline-flows { background:transparent; border-bottom:none; }
#sdp-sidebar-baseline .sdp-baseline-flows-details { padding:0 0 8px; }
#sdp-sidebar-baseline .sdp-baseline-eval { border-bottom:none; padding:0 0 10px; }
#sdp-sidebar-baseline .sdp-baseline-flow-list { max-height:160px; }
.sdp-baseline-info-bar { padding:12px 16px; background:linear-gradient(180deg,#eff6ff 0%,#f8fafc 100%); border-bottom:1px solid #bfdbfe; flex-shrink:0; }
.sdp-baseline-info-text { flex:1; min-width:0; }
.sdp-baseline-title { margin:0 0 4px; font-size:15px; font-weight:700; color:#0f172a; line-height:1.3; }
.sdp-baseline-desc { margin:0; font-size:12.5px; color:#475569; line-height:1.5; max-width:720px; }
.sdp-baseline-eval { flex-shrink:0; border-bottom:1px solid #e2e8f0; background:#fffbeb; padding:10px 16px 12px; }
.sdp-baseline-eval-hdr { display:flex; align-items:center; gap:10px; flex-wrap:wrap; margin-bottom:6px; }
.sdp-baseline-eval-score { display:inline-flex; align-items:center; justify-content:center; min-width:42px; height:28px; padding:0 8px; border-radius:999px; font-size:12px; font-weight:800; letter-spacing:.02em; }
.sdp-baseline-eval-score--good { background:#dcfce7; color:#166534; border:1px solid #86efac; }
.sdp-baseline-eval-score--ok { background:#fef9c3; color:#854d0e; border:1px solid #fde047; }
.sdp-baseline-eval-score--bad { background:#fee2e2; color:#991b1b; border:1px solid #fca5a5; }
.sdp-baseline-eval-summary { font-size:12px; color:#78350f; line-height:1.45; }
.sdp-baseline-eval-list { margin:0; padding:0 0 0 16px; max-height:120px; overflow-y:auto; font-size:11.5px; color:#92400e; line-height:1.45; }
.sdp-baseline-eval-list li { margin:2px 0; }
.sdp-baseline-eval-list li.is-fix { color:#166534; }
.sdp-baseline-eval-list li.is-warn { color:#92400e; }
.sdp-baseline-eval-list li.is-error { color:#991b1b; }
html[data-theme="dark"] .sdp-baseline-eval,
html.dark .sdp-baseline-eval { background:#1c1917; border-color:#334155; }
html[data-theme="dark"] .sdp-baseline-eval-summary,
html.dark .sdp-baseline-eval-summary { color:#fcd34d; }
html[data-theme="dark"] .sdp-baseline-eval-list,
html.dark .sdp-baseline-eval-list { color:#fde68a; }
.sdp-baseline-flows { flex-shrink:0; border-bottom:1px solid #e2e8f0; background:#fff; }
.sdp-baseline-flows-details { padding:0 16px 10px; }
.sdp-baseline-flows-summary { cursor:pointer; font-size:11px; font-weight:700; letter-spacing:.05em; text-transform:uppercase; color:#64748b; padding:8px 0 6px; list-style:none; user-select:none; }
.sdp-baseline-flows-summary::-webkit-details-marker { display:none; }
.sdp-baseline-flows-summary::before { content:'▾ '; color:#94a3b8; }
.sdp-baseline-flows-details:not([open]) .sdp-baseline-flows-summary::before { content:'▸ '; }
.sdp-baseline-flow-list { display:flex; flex-wrap:wrap; gap:6px; max-height:88px; overflow-y:auto; padding-bottom:2px; }
.sdp-bl-flow-chip { display:inline-flex; align-items:center; gap:5px; padding:4px 9px; border-radius:999px; border:1px solid #e2e8f0; background:#f8fafc; font-size:11px; color:#334155; line-height:1.2; white-space:nowrap; }
.sdp-bl-flow-chip strong { font-weight:600; color:#0f172a; }
.sdp-bl-flow-arrow { color:#94a3b8; font-size:10px; }
.sdp-bl-flow-proto { color:#2563eb; font-weight:600; font-size:10px; }
.sdp-baseline-scroll { flex:1; overflow:auto; padding:16px; background:#f1f5f9; display:flex; min-height:0; -webkit-overflow-scrolling:touch; align-items:flex-start; justify-content:flex-start; }
.sdp-baseline-svg { display:block; flex:0 0 auto; width:auto; height:auto; min-height:0; min-width:0; max-height:none; border-radius:12px; box-shadow:0 4px 24px rgba(15,23,42,.08); background:#fff; touch-action:none; }
.sdp-bl-tier-bg { stroke-width:1; }
.sdp-bl-tier-accent { stroke-width:0; }
.sdp-bl-tier-title { fill:#334155; font-size:11px; font-weight:700; letter-spacing:.04em; }
.sdp-bl-tier-sub { fill:#94a3b8; font-size:9px; font-weight:500; letter-spacing:.06em; text-transform:uppercase; }
.sdp-bl-diagram-title { fill:#0f172a; font-size:16px; font-weight:700; }
.sdp-bl-diagram-flow { fill:#64748b; font-size:11px; font-weight:600; }
.sdp-bl-edge { fill:none; stroke:#94a3b8; stroke-width:1.75; stroke-linecap:round; stroke-linejoin:round; transition:stroke .12s,stroke-width .12s,opacity .12s; opacity:.72; cursor:pointer; pointer-events:stroke; }
.sdp-bl-edge:hover, .sdp-bl-edge.is-hovered { stroke:#2563eb; stroke-width:2.25; opacity:1; }
.sdp-bl-edge--async { stroke-dasharray:7 5; }
#sdp-baseline-svg [data-node-id] .sdp-bl-node-shadow { transition:opacity .12s; }
#sdp-baseline-svg [data-node-id]:hover .sdp-bl-node-card { filter:brightness(.97); stroke-width:2.5; }
#sdp-baseline-svg [data-node-id]:hover .sdp-bl-node-shadow { opacity:.14; }
html[data-theme="dark"] .sdp-baseline-info-bar,
html.dark .sdp-baseline-info-bar { background:linear-gradient(180deg,#1e293b 0%,#0f172a 100%); border-color:#334155; }
html[data-theme="dark"] .sdp-baseline-title,
html.dark .sdp-baseline-title { color:#f1f5f9; }
html[data-theme="dark"] .sdp-baseline-desc,
html.dark .sdp-baseline-desc { color:#94a3b8; }
html[data-theme="dark"] .sdp-baseline-flows,
html.dark .sdp-baseline-flows { background:#0f172a; border-color:#334155; }
html[data-theme="dark"] .sdp-bl-flow-chip,
html.dark .sdp-bl-flow-chip { background:#1e293b; border-color:#334155; color:#cbd5e1; }
html[data-theme="dark"] .sdp-bl-flow-chip strong,
html.dark .sdp-bl-flow-chip strong { color:#f1f5f9; }
html[data-theme="dark"] .sdp-baseline-scroll,
html.dark .sdp-baseline-scroll { background:#020617; }
html[data-theme="dark"] .sdp-baseline-svg,
html.dark .sdp-baseline-svg { background:#0f172a; box-shadow:0 4px 24px rgba(0,0,0,.35); }
html[data-theme="dark"] .sdp-bl-tier-title,
html.dark .sdp-bl-tier-title { fill:#e2e8f0; }
html[data-theme="dark"] .sdp-bl-diagram-title,
html.dark .sdp-bl-diagram-title { fill:#f1f5f9; }
html[data-theme="dark"] .sdp-bl-edge,
html.dark .sdp-bl-edge { stroke:#64748b; }
html[data-theme="dark"] .sdp-bl-edge:hover,
html.dark .sdp-bl-edge:hover,
html[data-theme="dark"] .sdp-bl-edge.is-hovered,
html.dark .sdp-bl-edge.is-hovered { stroke:#60a5fa; }
html[data-theme="dark"] #sdp-bl-header rect,
html.dark #sdp-bl-header rect { fill:#1e293b; stroke:#334155; }
html[data-theme="dark"] .sdp-bl-tier-bg,
html.dark .sdp-bl-tier-bg { fill:#1a2233; stroke:#2d3f5a; }
html[data-theme="dark"] .sdp-bl-diagram-flow,
html.dark .sdp-bl-diagram-flow { fill:#94a3b8; }
.sdp-baseline-empty { flex:1; display:flex; flex-direction:column; align-items:center; justify-content:center; text-align:center; padding:40px 24px; color:#94a3b8; font-size:14px; line-height:1.55; }
.sdp-baseline-empty p { max-width:320px; margin:0; }
/* Baseline node interactive states */
#sdp-baseline-svg [data-node-id] { cursor:grab; }
#sdp-baseline-svg [data-node-id]:active { cursor:grabbing; }
/* Info bar layout */
.sdp-baseline-info-bar { display:flex; align-items:flex-start; justify-content:space-between; gap:12px; flex-wrap:wrap; }
.sdp-baseline-info-actions { display:flex; align-items:center; gap:8px; flex-shrink:0; flex-wrap:wrap; }
.sdp-baseline-diagram-chrome { flex-shrink:0; border-bottom:1px solid var(--border-light,#e2e8f0); background:var(--background-primary,#fff); }
.sdp-diagram-view-tabs { margin-bottom:0; }
.sdp-diagram-toolbar { display:flex; align-items:center; justify-content:space-between; gap:12px; flex-wrap:wrap; padding:8px 16px; border-top:1px solid #f1f5f9; background:#f8fafc; }
.sdp-diagram-toolbar__actions { display:flex; align-items:center; gap:8px; margin-left:auto; }
/* display:flex beats [hidden]'s display:none — only show active diagram view */
.sdp-baseline-view { flex:1; flex-direction:column; min-height:0; overflow:hidden; display:none; }
.sdp-baseline-view:not([hidden]) { display:flex; }
.sdp-baseline-sim { --pg-bg:#fafafa; --pg-fg:#18181b; --pg-stage:#0a0a0b; --pg-stage-fg:#e4e4e7; --pg-border:#e4e4e7; --pg-card:#fff; --pg-muted:#71717a; --pg-accent:#ff3333; background:var(--pg-bg); padding:0; flex:1; min-height:0; overflow:hidden; flex-direction:column; }
.sdp-baseline-sim .sdc-playground__metrics { margin-bottom:0; }
.sdp-baseline-sim__metrics { flex-shrink:0; margin:0; padding:8px 10px 0; }
.sdp-baseline-sim__stage { flex:1; display:flex; flex-direction:column; min-height:0; border:1px solid var(--pg-border); margin:6px 8px 8px; }
.sdp-baseline-sim .sdc-playground__stage { flex:1; min-height:0 !important; }
.sdp-baseline-sim .sdc-playground__stage-bar,
.sdp-baseline-sim .sdc-playground__stage-footer { flex-shrink:0; }
.sdp-baseline-sim .sdc-playground__canvas-wrap { flex:1; min-height:0; overflow:auto; display:flex; align-items:stretch; -webkit-overflow-scrolling:touch; }
.sdp-baseline-sim .sdc-playground__svg { width:100%; height:100%; max-height:none !important; min-height:0 !important; flex:1 1 auto; }
.sdp-baseline-sim .sdc-playground__stage-footer { flex-shrink:0; }
html[data-theme="dark"] .sdp-baseline-diagram-chrome,
html.dark .sdp-baseline-diagram-chrome { background:#1e293b; border-color:#334155; }
html[data-theme="dark"] .sdp-diagram-toolbar,
html.dark .sdp-diagram-toolbar { background:#0f172a; border-color:#334155; }
html[data-theme="dark"] .sdp-baseline-sim,
html.dark .sdp-baseline-sim { --pg-bg:#09090b; --pg-card:#18181b; --pg-border:#27272a; }
.sdp-baseline-drag-hint { display:flex; align-items:center; gap:4px; font-size:11px; color:#9ca3af; white-space:nowrap; }
/* Zoom controls */
.sdp-zoom-controls { display:flex; align-items:center; gap:1px; background:#e2e8f0; border-radius:7px; padding:2px; }
.sdp-zoom-btn { display:inline-flex; align-items:center; justify-content:center; width:26px; height:26px; border:none; background:transparent; border-radius:5px; color:#475569; cursor:pointer; transition:background .1s,color .1s; flex-shrink:0; }
.sdp-zoom-btn:hover { background:#fff; color:#1e293b; box-shadow:0 1px 3px rgba(0,0,0,.12); }
.sdp-zoom-btn:active { background:#cbd5e1; }
.sdp-zoom-btn--reset { width:auto; padding:0 7px; font-size:10px; font-weight:700; letter-spacing:.02em; }
.sdp-zoom-level { font-size:11px; font-weight:600; color:#64748b; min-width:38px; text-align:center; user-select:none; padding:0 2px; }
/* Edge label pill (SVG elements styled via CSS) */
.sdp-edge-lbl-bg { fill:#f1f5f9; stroke:#cbd5e1; }
.sdp-edge-lbl-text { fill:#374151; }
/* Clear buttons shared style */
.sdp-canvas-clear-btn { display:inline-flex; align-items:center; gap:4px; padding:4px 10px; border:1px solid #fca5a5; border-radius:6px; background:#fff; color:#ef4444; font-size:11px; font-weight:500; cursor:pointer; white-space:nowrap; transition:background .12s,border-color .12s,color .12s; }
.sdp-canvas-clear-btn:hover { background:#fef2f2; border-color:#ef4444; }
.sdp-canvas-clear-btn:active { background:#fee2e2; }
/* Draw canvas toolbar — floated inside sdp-draw-wrap */
.sdp-draw-canvas-toolbar { position:absolute; top:10px; right:12px; z-index:5; display:flex; flex-direction:row-reverse; gap:8px; align-items:center; }
.sdp-canvas-clear-btn--draw { box-shadow:0 1px 4px rgba(0,0,0,.1); }
.sdp-canvas-restore-btn { display:inline-flex; align-items:center; gap:4px; padding:4px 10px; border:1px solid #93c5fd; border-radius:6px; background:#fff; color:#2563eb; font-size:11px; font-weight:500; cursor:pointer; white-space:nowrap; transition:background .12s,border-color .12s,color .12s; box-shadow:0 1px 4px rgba(0,0,0,.1); }
.sdp-canvas-restore-btn:hover { background:#eff6ff; border-color:#2563eb; }
.sdp-canvas-restore-btn:active { background:#dbeafe; }
.sdp-canvas-restore-btn:disabled { opacity:.55; cursor:not-allowed; }
html[data-theme="dark"] .sdp-canvas-restore-btn,
html.dark .sdp-canvas-restore-btn { background:#1e293b; border-color:#1d4ed8; color:#93c5fd; }
html[data-theme="dark"] .sdp-canvas-restore-btn:hover,
html.dark .sdp-canvas-restore-btn:hover { background:#172554; border-color:#3b82f6; }
/* Dark mode */
html[data-theme="dark"] .sdp-canvas-clear-btn,
html.dark .sdp-canvas-clear-btn { background:#1e293b; border-color:#7f1d1d; color:#fca5a5; }
html[data-theme="dark"] .sdp-canvas-clear-btn:hover,
html.dark .sdp-canvas-clear-btn:hover { background:#291818; border-color:#ef4444; }
/* Guidance tooltip */
.sdp-guidance-tip { position:absolute; z-index:20; max-width:260px; background:#1e293b; color:#f1f5f9; font-size:12px; line-height:1.45; padding:8px 11px; border-radius:6px; pointer-events:none; white-space:pre-line; box-shadow:0 4px 14px rgba(0,0,0,.25); }

/* Draw canvas */
.sdp-draw-wrap { flex:1; overflow:auto; position:relative; }
.sdp-draw-svg {
    display:block; width:100%; height:100%; min-height:500px; cursor:default; user-select:none; outline:none;
    background-color:#f8fafc;
    background-image:
        linear-gradient(rgba(100,116,139,.08) 1px, transparent 1px),
        linear-gradient(90deg, rgba(100,116,139,.08) 1px, transparent 1px);
    background-size:24px 24px;
}
.sdp-draw-svg:focus-visible { outline:2px solid #2563eb; outline-offset:-2px; border-radius:4px; }
.sdp-draw-placeholder text { pointer-events:none; }
/* Draw canvas connection ports (input left, output right) */
.sdp-dw-port-dot { pointer-events:none; transition:stroke .12s,fill .12s; }
.sdp-dw-port-hit { cursor:crosshair; }
[data-node-id].is-connect-target { cursor:crosshair; }
[data-node-id].is-connecting .sdp-dw-port-out-dot { stroke:#f59e0b; fill:#fffbeb; }
[data-node-id].is-connect-target .sdp-dw-port-in-dot { stroke:#16a34a; }
html[data-theme="dark"] .sdp-dw-port-dot,
html.dark .sdp-dw-port-dot { fill:#0f172a; stroke:#60a5fa; }
html[data-theme="dark"] [data-node-id].is-connecting .sdp-dw-port-out-dot,
html.dark [data-node-id].is-connecting .sdp-dw-port-out-dot { stroke:#fbbf24; fill:#292524; }
html[data-theme="dark"] [data-node-id].is-connect-target .sdp-dw-port-in-dot,
html.dark [data-node-id].is-connect-target .sdp-dw-port-in-dot { stroke:#34d399; }
html[data-theme="dark"] .sdp-draw-svg,
html.dark .sdp-draw-svg {
    background-color:#0f172a;
    background-image:
        linear-gradient(rgba(148,163,184,.07) 1px, transparent 1px),
        linear-gradient(90deg, rgba(148,163,184,.07) 1px, transparent 1px);
}

/* Feedback panel */
.sdp-feedback-panel { flex-shrink:0; border-top:1px solid #e2e8f0; background:#fff; padding:12px 16px; max-height:260px; overflow-y:auto; }
.sdp-fb-title { margin:0 0 10px; font-size:13px; font-weight:600; color:#1e293b; }
.sdp-fb-item { display:flex; gap:8px; align-items:baseline; padding:6px 0; border-bottom:1px solid #f1f5f9; font-size:13px; line-height:1.5; }
.sdp-fb-item:last-child { border-bottom:none; }
.sdp-fb-ok    { color:#166534; }
.sdp-fb-error { color:#991b1b; }
.sdp-fb-warn  { color:#92400e; }
.sdp-fb-success { color:#1e3a8a; font-weight:600; }
.sdp-fb-info  { color:#374151; }
.sdp-fb-item strong { font-weight:700; }

/* Sidebar */
.sdp-sidebar-hint { font-size:12px; color:#64748b; line-height:1.5; margin:0 0 10px; }
.sdp-examples { display:flex; flex-wrap:wrap; gap:4px; margin:0 0 10px; align-items:center; }
.sdp-examples-label { font-size:11px; color:#94a3b8; margin-right:2px; }
.sdp-example-chip { padding:3px 9px; border:1px solid #cbd5e1; border-radius:12px; background:#f8fafc; font-size:11px; color:#475569; cursor:pointer; transition:background .15s,border-color .15s; }
.sdp-example-chip:hover { background:#e2e8f0; border-color:#94a3b8; }
.sdp-generate-btn { width:100%; display:flex; align-items:center; justify-content:center; gap:6px; margin-top:4px; }
.sdp-concept-input { margin-bottom:6px; }
/* Palette */
.sdp-palette { display:flex; flex-direction:column; gap:3px; margin-bottom:10px; max-height:260px; overflow-y:auto; }
.sdp-palette-item { display:flex; align-items:center; gap:8px; padding:6px 10px; border:1px solid #e2e8f0; border-radius:6px; background:#fff; font-size:12px; color:#374151; cursor:pointer; text-align:left; transition:background .12s,border-color .12s; }
.sdp-palette-item:hover { background:#f1f5f9; border-color:#94a3b8; }
.sdp-palette-dot { width:10px; height:10px; border-radius:50%; flex-shrink:0; }
/* Dot colours matching NODE_CFG in JS */
.sdp-dot-client        { background:#1e40af; }
.sdp-dot-dns           { background:#0369a1; }
.sdp-dot-cdn           { background:#7e22ce; }
.sdp-dot-load_balancer { background:#1d4ed8; }
.sdp-dot-api_gateway   { background:#0e7490; }
.sdp-dot-web_server    { background:#15803d; }
.sdp-dot-service       { background:#166534; }
.sdp-dot-message_queue { background:#92400e; }
.sdp-dot-cache         { background:#b91c1c; }
.sdp-dot-database      { background:#6d28d9; }
.sdp-dot-nosql         { background:#059669; }
.sdp-dot-storage       { background:#7c3aed; }
.sdp-dot-notification  { background:#c2410c; }
.sdp-dot-search        { background:#0f766e; }
.sdp-canvas-actions { display:flex; flex-direction:column; gap:6px; }
.sdp-check-btn  { display:flex; align-items:center; justify-content:center; gap:5px; }
.sdp-delete-btn, .sdp-reset-btn { font-size:12px; padding:6px 10px; }
/* Toast */
.sdp-toast { position:absolute; bottom:16px; left:50%; transform:translateX(-50%) translateY(10px); background:#1e293b; color:#f8fafc; padding:9px 16px; border-radius:8px; font-size:12.5px; white-space:nowrap; max-width:90%; text-align:center; opacity:0; transition:opacity .2s,transform .2s; pointer-events:none; z-index:30; }
.sdp-toast--visible { opacity:1; transform:translateX(-50%) translateY(0); }
.sdp-toast--warn  { background:#78350f; }
.sdp-toast--error { background:#7f1d1d; }
.sdp-toast--info  { background:#1e3a5f; }
/* Dark mode */
html[data-theme="dark"] .sdp-subtabs,
html.dark .sdp-subtabs { background:#1e293b; border-color:#334155; }
html[data-theme="dark"] .sdp-subtab,
html.dark .sdp-subtab { color:#94a3b8; }
html[data-theme="dark"] .sdp-subtab--active,
html.dark .sdp-subtab--active { color:#60a5fa; border-bottom-color:#60a5fa; }
html[data-theme="dark"] .sdp-baseline-scroll,
html.dark .sdp-baseline-scroll,
html[data-theme="dark"] .sdp-baseline-empty,
html.dark .sdp-baseline-empty { background:#0f172a; }
html[data-theme="dark"] .sdp-zoom-controls,
html.dark .sdp-zoom-controls { background:#1e293b; }
html[data-theme="dark"] .sdp-zoom-btn,
html.dark .sdp-zoom-btn { color:#94a3b8; }
html[data-theme="dark"] .sdp-zoom-btn:hover,
html.dark .sdp-zoom-btn:hover { background:#0f172a; color:#e2e8f0; box-shadow:0 1px 3px rgba(0,0,0,.3); }
html[data-theme="dark"] .sdp-zoom-btn:active,
html.dark .sdp-zoom-btn:active { background:#334155; }
html[data-theme="dark"] .sdp-zoom-level,
html.dark .sdp-zoom-level { color:#94a3b8; }
html[data-theme="dark"] .sdp-edge-lbl-bg,
html.dark .sdp-edge-lbl-bg { fill:#1e293b; stroke:#334155; }
html[data-theme="dark"] .sdp-edge-lbl-text,
html.dark .sdp-edge-lbl-text { fill:#cbd5e1; }
html[data-theme="dark"] .sdp-feedback-panel,
html.dark .sdp-feedback-panel { background:#1e293b; border-color:#334155; }
html[data-theme="dark"] .sdp-fb-title,
html.dark .sdp-fb-title { color:#f1f5f9; }
html[data-theme="dark"] .sdp-palette-item,
html.dark .sdp-palette-item { background:#1e293b; border-color:#334155; color:#e2e8f0; }
html[data-theme="dark"] .sdp-palette-item:hover,
html.dark .sdp-palette-item:hover { background:#334155; }

/* Cached badge */
.sdp-cached-badge { display:inline-flex; align-items:center; gap:4px; font-size:10px; font-weight:600; color:#059669; background:#d1fae5; border:1px solid #a7f3d0; border-radius:10px; padding:2px 8px; margin-top:6px; }
/* Upgrade notice */
.sdp-upgrade-notice { display:flex; flex-direction:column; align-items:center; gap:10px; padding:16px 12px; background:#faf5ff; border:1px solid #e9d5ff; border-radius:8px; text-align:center; margin-bottom:12px; }
.sdp-upgrade-notice svg { color:#7c3aed; flex-shrink:0; }
.sdp-upgrade-notice__text { font-size:13px; color:#4c1d95; line-height:1.5; margin:0; }
.sdp-upgrade-btn { font-size:12px; padding:7px 16px; }
html[data-theme="dark"] .sdp-upgrade-notice,
html.dark .sdp-upgrade-notice { background:#1e1b2e; border-color:#4c1d95; }
html[data-theme="dark"] .sdp-upgrade-notice__text,
html.dark .sdp-upgrade-notice__text { color:#c4b5fd; }
/* Library */
.sdp-library { margin-top:14px; border-top:1px solid #e2e8f0; padding-top:12px; }
.sdp-library-hdr { display:flex; align-items:center; justify-content:space-between; margin-bottom:8px; gap:8px; }
.sdp-library-title { display:flex; align-items:center; gap:5px; font-size:12px; font-weight:600; color:#374151; }
.sdp-library-actions { display:flex; align-items:center; gap:4px; flex-shrink:0; }
.sdp-library-verify { border:1px solid #bfdbfe; background:#eff6ff; color:#1d4ed8; font-size:10px; font-weight:700; letter-spacing:.03em; text-transform:uppercase; padding:3px 7px; border-radius:5px; cursor:pointer; transition:background .12s,border-color .12s; }
.sdp-library-verify:hover { background:#dbeafe; border-color:#93c5fd; }
.sdp-library-verify.is-busy { opacity:.65; pointer-events:none; }
.sdp-lib-score { flex-shrink:0; font-size:10px; font-weight:700; padding:2px 6px; border-radius:999px; border:1px solid transparent; }
.sdp-lib-score--good { background:#dcfce7; color:#166534; border-color:#86efac; }
.sdp-lib-score--ok { background:#fef9c3; color:#854d0e; border-color:#fde047; }
.sdp-lib-score--bad { background:#fee2e2; color:#991b1b; border-color:#fca5a5; }
.sdp-library-refresh { background:none; border:none; color:#9ca3af; cursor:pointer; font-size:14px; padding:2px 4px; border-radius:4px; line-height:1; transition:color .15s,transform .2s; }
.sdp-library-refresh:hover { color:#374151; }
.sdp-library-refresh.is-spinning { animation:sdp-spin .6s linear infinite; }
@keyframes sdp-spin { to { transform:rotate(360deg); } }
.sdp-library-search { width:100%; padding:5px 8px; border:1px solid #e2e8f0; border-radius:6px; font-size:12px; color:#374151; background:#fff; margin-bottom:6px; box-sizing:border-box; }
.sdp-library-search:focus { outline:none; border-color:#93c5fd; }
.sdp-library-list { display:flex; flex-direction:column; gap:3px; max-height:220px; overflow-y:auto; }
.sdp-library-list::-webkit-scrollbar { width:4px; }
.sdp-library-list::-webkit-scrollbar-thumb { background:#cbd5e1; border-radius:2px; }
.sdp-lib-row { display:flex; align-items:stretch; gap:2px; }
.sdp-lib-btn { flex:1; min-width:0; display:flex; align-items:center; justify-content:space-between; gap:6px; padding:6px 8px; border:1px solid #e2e8f0; border-radius:6px; background:#fff; cursor:pointer; text-align:left; font-size:12px; color:#374151; transition:background .12s,border-color .12s; }
.sdp-lib-btn:hover { background:#f0f9ff; border-color:#93c5fd; }
.sdp-lib-btn.is-active { background:#eff6ff; border-color:#3b82f6; }
.sdp-lib-concept { font-weight:500; overflow:hidden; text-overflow:ellipsis; white-space:nowrap; min-width:0; }
.sdp-lib-uses { flex-shrink:0; font-size:10px; color:#9ca3af; white-space:nowrap; }
.sdp-lib-verify-one { flex-shrink:0; width:24px; border:1px solid #bfdbfe; border-radius:6px; background:#eff6ff; color:#2563eb; cursor:pointer; font-size:12px; font-weight:700; line-height:1; padding:0; transition:background .12s; }
.sdp-lib-verify-one:hover { background:#dbeafe; }
.sdp-lib-del { flex-shrink:0; width:24px; border:1px solid #fecaca; border-radius:6px; background:#fff; color:#ef4444; cursor:pointer; font-size:14px; line-height:1; padding:0; transition:background .12s; }
.sdp-lib-del:hover { background:#fef2f2; }
.sdp-library-empty, .sdp-library-loading { font-size:12px; color:#9ca3af; padding:8px 0; margin:0; }
/* Dark mode */
html[data-theme="dark"] .sdp-library,
html.dark .sdp-library { border-color:#334155; }
html[data-theme="dark"] .sdp-library-title,
html.dark .sdp-library-title { color:#e2e8f0; }
html[data-theme="dark"] .sdp-library-search,
html.dark .sdp-library-search { background:#1e293b; border-color:#334155; color:#e2e8f0; }
html[data-theme="dark"] .sdp-lib-btn,
html.dark .sdp-lib-btn { background:#1e293b; border-color:#334155; color:#e2e8f0; }
html[data-theme="dark"] .sdp-lib-btn:hover,
html.dark .sdp-lib-btn:hover { background:#1e3a5f; border-color:#60a5fa; }
/* Practice draw layout — tablet & mobile */
@media (max-width: 1024px) {
    .playground-layout:has(#playground-main-panel-design:not([hidden]) #sdp-section-draw:not([hidden])) .playground-sidebar-column {
        display: none;
    }
    .sdp-draw-workspace { flex-direction: column; }
    .sdp-draw-tools-panel {
        width: 100%; max-height: 220px; border-right: none;
        border-bottom: 1px solid var(--border-light,#e2e8f0);
    }
    .sdp-draw-tools-panel .sdp-palette { flex: none; max-height: 120px; }
}
@media (max-width: 640px) {
    .sdp-draw-tools-panel { padding: 10px 12px; max-height: 200px; }
    .sdp-draw-tools-panel .sdp-palette { max-height: 100px; }
}

/* ── Fixes from the 2026-09-08 page review ─────────────────────────────── */
/* Below 1024px the sidebar becomes a grid and each panel section a grid item.
   A grid item's automatic minimum width is its min-content, and the Saved
   Baselines titles are long single-line buttons, so the Design sidebar grew
   to ~400px and ran off the right edge of a phone screen. */
.playground-page .playground-panel-section { min-width: 0; max-width: 100%; }
.playground-page .sdp-lib-btn > span:first-child { min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
/* Small caption under a locked or empty mode tab saying why it is greyed out. */
.playground-page .playground-mode-tab__note { display: block; font-size: 10px; font-weight: 400; line-height: 1.2; opacity: .7; margin-top: 2px; }