:root {
    --primary: #1d4ed8;
    --bg: #f3f4f6;
    --text: #1f2937;
    --muted: #4b5563;
    --line: #e5e7eb;
    color-scheme: light;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    margin: 0;
    color: var(--text);
    background: var(--bg);
    font-family:
        ui-sans-serif,
        system-ui,
        -apple-system,
        BlinkMacSystemFont,
        "Segoe UI",
        sans-serif;
    line-height: 1.6;
}

acl-playground-app,
playground-site-header,
playground-workbench-controls,
playground-editor-pane,
playground-preview-pane,
playground-accessibility-summary,
playground-diagnostics,
playground-site-footer {
    display: block;
}

acl-playground-app,
.playground-page {
    min-height: 100vh;
    flex: 1;
}

.playground-page {
    display: flex;
    flex-direction: column;
}

playground-editor-pane,
playground-preview-pane {
    min-width: 0;
}

playground-editor-pane > .editor-pane,
playground-preview-pane > .preview-pane {
    height: 100%;
}

a {
    color: var(--primary);
}

button,
textarea,
input {
    font: inherit;
}

button:focus-visible,
textarea:focus-visible,
input:focus-visible,
a:focus-visible,
iframe:focus-visible,
[role="separator"]:focus-visible,
pre:focus-visible {
    outline: 3px solid rgba(37, 99, 235, 0.35);
    outline-offset: 3px;
}

.site-header {
    display: block;
    position: relative;
    z-index: 10;
    padding: clamp(1rem, 3vw, 2rem);
    border-bottom: 1px solid var(--line);
    background: #fff;
    text-align: center;
    box-sizing: border-box;
}

.site-header h1 {
    margin: 0;
    font-size: clamp(1.8rem, 4vw, 2.5rem);
    line-height: 1.2;
}

.site-header .subtitle {
    margin-top: 0.5rem;
    color: var(--muted);
    font-size: 1.1rem;
}

.github-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-top: 1rem;
    color: var(--primary);
    font-weight: 600;
    text-decoration: none;
}

.github-link:hover,
.site-footer a:hover {
    text-decoration: underline;
}

main {
    flex: 1;
    width: 100%;
    margin: 0 auto;
    padding: clamp(0.75rem, 1.5vw, 1.5rem);
}

main > section {
    max-width: 100%;
    margin-bottom: 0;
    padding: 1.25rem;
    border: 1px solid var(--line);
    border-radius: 12px;
    background: #fff;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

h2 {
    margin: 0 0 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--bg);
    font-size: 1.5rem;
}

h3 {
    margin: 0;
    font-size: 1rem;
}

p {
    color: var(--muted);
}

code,
pre,
textarea,
kbd {
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

kbd {
    padding: 0.12rem 0.32rem;
    border: 1px solid #cbd5e1;
    border-bottom-width: 2px;
    border-radius: 4px;
    color: #334155;
    background: #fff;
    font-size: 0.75rem;
}

.eyebrow {
    margin: 0 0 0.35rem;
    color: var(--primary);
    font-size: 0.75rem;
    font-weight: 800;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

.workbench-section {
    width: 100%;
    padding: 1.25rem;
}

.workbench-heading {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 0.5rem 0.75rem 1.25rem;
}

.workbench-heading h2 {
    margin: 0;
    padding: 0;
    border: 0;
}

.run-status {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    margin: 0;
    padding: 0.4rem 0.7rem;
    border-radius: 999px;
    color: #92400e;
    background: #fef3c7;
    font-size: 0.9rem;
    font-weight: 800;
}

.run-status::before {
    width: 0.6rem;
    height: 0.6rem;
    border-radius: 50%;
    background: currentcolor;
    content: "";
}

.run-status[data-state="running"] {
    color: #1d4ed8;
    background: #dbeafe;
}

.run-status[data-state="ready"] {
    color: #166534;
    background: #dcfce7;
}

.run-status[data-state="error"] {
    color: #991b1b;
    background: #fee2e2;
}

.workbench-toolbar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.65rem;
    margin-bottom: 1rem;
    padding: 0.75rem;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #f8fafc;
}

button {
    min-height: 2.5rem;
    padding: 0.5rem 0.8rem;
    border: 1px solid var(--primary);
    border-radius: 6px;
    color: #fff;
    background: var(--primary);
    font-weight: 700;
    cursor: pointer;
}

button:hover {
    background: #1e40af;
}

button:disabled {
    cursor: not-allowed;
    opacity: 0.58;
}

button.secondary {
    border-color: var(--line);
    color: var(--text);
    background: #fff;
}

button.secondary:hover {
    background: #f1f5f9;
}

.auto-run-control {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    min-height: 2.5rem;
    padding: 0.45rem 0.7rem;
    border: 1px solid var(--line);
    border-radius: 6px;
    background: #fff;
    font-weight: 700;
}

.auto-run-control input {
    width: 1rem;
    height: 1rem;
    accent-color: var(--primary);
}

.shortcut-hint {
    margin-left: auto;
    color: var(--muted);
    font-size: 0.82rem;
}

.workbench {
    --editor-share: 50%;
    display: grid;
    grid-template-columns: minmax(0, var(--editor-share)) 10px minmax(0, 1fr);
    min-height: max(720px, calc(100dvh - 18rem));
    overflow: hidden;
    border: 1px solid #cbd5e1;
    border-radius: 10px;
    background: #0f172a;
}

.editor-pane,
.preview-pane {
    min-width: 0;
}

.editor-pane {
    display: flex;
    flex-direction: column;
    background: #111827;
}

.editor-tabs {
    display: flex;
    gap: 0.2rem;
    overflow-x: auto;
    padding: 0.55rem 0.55rem 0;
    border-bottom: 1px solid #334155;
    background: #0f172a;
}

.editor-tabs button {
    min-height: 2.35rem;
    flex: 0 0 auto;
    padding: 0.45rem 0.7rem;
    border-color: transparent;
    border-radius: 6px 6px 0 0;
    color: #94a3b8;
    background: transparent;
    font-size: 0.82rem;
}

.editor-tabs button:hover {
    color: #e2e8f0;
    background: #1e293b;
}

.editor-tabs button[aria-selected="true"] {
    border-color: #334155;
    border-bottom-color: #111827;
    color: #fff;
    background: #111827;
}

.editor-panel {
    position: relative;
    min-height: 0;
    flex: 1;
}

.editor-panel[hidden] {
    display: none;
}

textarea {
    width: 100%;
    height: 100%;
    min-height: 650px;
    resize: none;
    padding: 1rem 1rem 2.5rem;
    border: 0;
    border-radius: 0;
    color: #dbeafe;
    background: #111827;
    font-size: 0.82rem;
    line-height: 1.55;
    tab-size: 2;
}

.editor-count {
    position: absolute;
    right: 0.75rem;
    bottom: 0.45rem;
    margin: 0;
    padding: 0.15rem 0.45rem;
    border-radius: 999px;
    color: #94a3b8;
    background: rgba(15, 23, 42, 0.85);
    font-size: 0.72rem;
    pointer-events: none;
}

.workbench-splitter {
    position: relative;
    z-index: 2;
    background: #334155;
    cursor: col-resize;
    touch-action: none;
}

.workbench-splitter::after {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 3px;
    height: 44px;
    border-radius: 999px;
    background: #94a3b8;
    content: "";
    transform: translate(-50%, -50%);
}

.preview-pane {
    display: flex;
    flex-direction: column;
    background: #fff;
}

.preview-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 2.95rem;
    padding: 0 0.8rem;
    border-bottom: 1px solid #cbd5e1;
    color: #475569;
    background: #f8fafc;
    font-size: 0.78rem;
    font-weight: 700;
}

.preview-dot {
    display: inline-block;
    width: 0.55rem;
    height: 0.55rem;
    margin-right: 0.35rem;
    border-radius: 50%;
    background: #22c55e;
}

#preview {
    width: 100%;
    min-height: 670px;
    flex: 1;
    border: 0;
    background: #eef2f7;
}

.a11y-summary {
    margin-top: 1rem;
    padding: 1rem;
    border: 1px solid var(--line);
    border-radius: 10px;
    background: #f8fafc;
}

.a11y-summary-heading,
.a11y-actions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem 1rem;
}

.a11y-summary-heading .eyebrow {
    margin-bottom: 0.1rem;
}

.a11y-state {
    color: var(--muted);
    font-size: 0.85rem;
    font-weight: 700;
}

.a11y-summary[data-state="ready"] .a11y-state {
    color: #166534;
}

.a11y-summary[data-state="issues"] .a11y-state,
.a11y-summary[data-state="partial"] .a11y-state,
.a11y-summary[data-state="stale"] .a11y-state {
    color: #92400e;
}

.a11y-summary[data-state="error"] .a11y-state {
    color: #991b1b;
}

.a11y-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0.75rem;
    margin: 0.9rem 0;
}

.a11y-grid article {
    min-width: 0;
    padding: 0.75rem;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #fff;
}

.a11y-grid span,
.a11y-grid strong {
    display: block;
}

.a11y-grid span {
    color: var(--muted);
    font-size: 0.75rem;
    font-weight: 800;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

.a11y-grid strong {
    margin-top: 0.25rem;
    font-size: 0.9rem;
}

.a11y-actions {
    justify-content: flex-start;
}

.diagnostics {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1rem;
    margin-top: 1rem;
}

.diagnostics[hidden] {
    display: none;
}

.diagnostics article {
    min-width: 0;
    padding: 1rem;
    border: 1px dashed #cbd5e1;
    border-radius: 8px;
    background: #fafafa;
}

.diagnostic-heading {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.text-button {
    min-height: auto;
    padding: 0.2rem;
    border: 0;
    color: var(--primary);
    background: transparent;
    font-size: 0.8rem;
}

.text-button:hover {
    text-decoration: underline;
    background: transparent;
}

.diagnostics pre {
    min-height: 11rem;
    max-height: 22rem;
    overflow: auto;
    margin: 0.75rem 0 0;
    padding: 1rem;
    border-radius: 7px;
    color: #e2e8f0;
    background: #0f172a;
    font-size: 0.78rem;
    line-height: 1.45;
    white-space: pre-wrap;
    overflow-wrap: anywhere;
}

.site-footer {
    display: block;
    width: 100%;
    margin-top: auto;
    border-top: 1px solid var(--line);
    color: var(--muted);
    background: #fff;
}

.site-footer .container {
    display: flex;
    max-width: 900px;
    margin: 0 auto;
    padding: clamp(1rem, 3vw, 2rem);
    box-sizing: border-box;
}

.site-footer .inner {
    width: 100%;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 1rem 2rem;
}

.site-footer .meta {
    color: var(--muted);
    font-size: 0.9rem;
}

.site-footer .meta strong {
    color: var(--text);
}

.site-footer nav {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.75rem 1rem;
}

.site-footer a {
    color: var(--primary);
    font-weight: 600;
    text-decoration: none;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    margin: -1px;
    padding: 0;
    overflow: hidden;
    border: 0;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
}

@media (max-width: 900px) {
    main {
        padding: 1rem;
    }

    main > section {
        margin-bottom: 1.5rem;
        padding: 1.25rem;
    }

    .workbench {
        display: flex;
        min-height: 0;
        flex-direction: column;
    }

    .workbench-splitter {
        display: none;
    }

    textarea {
        min-height: 430px;
    }

    #preview {
        min-height: 620px;
    }

    .diagnostics {
        grid-template-columns: 1fr;
    }

    .a11y-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 760px) {
    .site-footer .inner {
        align-items: flex-start;
        flex-direction: column;
    }
}

@media (max-width: 620px) {
    .workbench-section {
        padding: 0.75rem;
    }

    .shortcut-hint {
        width: 100%;
        margin-left: 0;
    }
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }
}