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

/* ── Theme: CSS custom properties ── */
:root,
[data-theme="dark"] {
    --bg-primary: #1e1e1e;
    --bg-secondary: #252526;
    --bg-tertiary: #3c3c3c;
    --bg-hover: #2a2d2e;
    --fg-primary: #d4d4d4;
    --fg-secondary: #e0e0e0;
    --fg-muted: #808080;
    --border-color: #3c3c3c;
    --accent-color: #007acc;
    --accent-hover: #1177bb;
    --btn-primary-bg: #0e639c;
    --btn-primary-bg-hover: #1177bb;
    --btn-primary-fg: #fff;
    --btn-secondary-bg: #3c3c3c;
    --btn-secondary-bg-hover: #505050;
    --btn-secondary-fg: #d4d4d4;
    --btn-secondary-border: #555;
    --btn-disabled-bg: #3c3c3c;
    --btn-disabled-fg: #888;
    --console-error: #f48771;
    --console-success: #89d185;
    --status-bar-bg: #007acc;
    --status-bar-fg: #fff;
    --status-error-bg: #c72e2e;
    --modal-overlay-bg: rgba(0, 0, 0, 0.6);
    --modal-bg: #1e1e2e;
    --modal-border: #444;
    --modal-shadow: rgba(0, 0, 0, 0.5);
    --modal-heading-color: #f0c040;
    --modal-text-color: #b0b0c0;
    --description-bg: #2d2d30;
    --description-fg: #b0b0b0;
}

[data-theme="light"] {
    --bg-primary: #ffffff;
    --bg-secondary: #f3f3f3;
    --bg-tertiary: #e0e0e0;
    --bg-hover: #e8e8e8;
    --fg-primary: #1e1e1e;
    --fg-secondary: #333333;
    --fg-muted: #666666;
    --border-color: #d4d4d4;
    --accent-color: #0066b8;
    --accent-hover: #005a9e;
    --btn-primary-bg: #0066b8;
    --btn-primary-bg-hover: #005a9e;
    --btn-primary-fg: #fff;
    --btn-secondary-bg: #e0e0e0;
    --btn-secondary-bg-hover: #d0d0d0;
    --btn-secondary-fg: #333;
    --btn-secondary-border: #bbb;
    --btn-disabled-bg: #e0e0e0;
    --btn-disabled-fg: #999;
    --console-error: #d32f2f;
    --console-success: #2e7d32;
    --status-bar-bg: #007acc;
    --status-bar-fg: #fff;
    --status-error-bg: #c72e2e;
    --modal-overlay-bg: rgba(0, 0, 0, 0.35);
    --modal-bg: #ffffff;
    --modal-border: #d4d4d4;
    --modal-shadow: rgba(0, 0, 0, 0.15);
    --modal-heading-color: #b8860b;
    --modal-text-color: #555;
    --description-bg: #f0f0f0;
    --description-fg: #666;
}

@media (prefers-color-scheme: light) {
    :root:not([data-theme="dark"]) {
        --bg-primary: #ffffff;
        --bg-secondary: #f3f3f3;
        --bg-tertiary: #e0e0e0;
        --bg-hover: #e8e8e8;
        --fg-primary: #1e1e1e;
        --fg-secondary: #333333;
        --fg-muted: #666666;
        --border-color: #d4d4d4;
        --accent-color: #0066b8;
        --accent-hover: #005a9e;
        --btn-primary-bg: #0066b8;
        --btn-primary-bg-hover: #005a9e;
        --btn-primary-fg: #fff;
        --btn-secondary-bg: #e0e0e0;
        --btn-secondary-bg-hover: #d0d0d0;
        --btn-secondary-fg: #333;
        --btn-secondary-border: #bbb;
        --btn-disabled-bg: #e0e0e0;
        --btn-disabled-fg: #999;
        --console-error: #d32f2f;
        --console-success: #2e7d32;
        --status-bar-bg: #007acc;
        --status-bar-fg: #fff;
        --status-error-bg: #c72e2e;
        --modal-overlay-bg: rgba(0, 0, 0, 0.35);
        --modal-bg: #ffffff;
        --modal-border: #d4d4d4;
        --modal-shadow: rgba(0, 0, 0, 0.15);
        --modal-heading-color: #b8860b;
        --modal-text-color: #555;
        --description-bg: #f0f0f0;
        --description-fg: #666;
    }
}

/* ── Base ── */
html, body {
    margin: 0;
    padding: 0;
    height: 100%;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    font-size: 13px;
    color: var(--fg-primary);
    background: var(--bg-primary);
    overflow: hidden;
}

#app {
    height: 100%;
    display: flex;
    flex-direction: column;
}

/* ── Toolbar ── */
.playground-toolbar {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 0 12px;
    height: 40px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    flex-shrink: 0;
    flex-wrap: nowrap;
    overflow-x: auto;
}

.playground-toolbar h1 {
    font-size: 14px;
    font-weight: 600;
    margin: 0;
    white-space: nowrap;
    color: var(--fg-secondary);
}

.spacer {
    flex: 1;
}

.toolbar-select {
    font-size: 12px;
    padding: 3px 6px;
    border: 1px solid var(--btn-secondary-border);
    border-radius: 3px;
    background: var(--btn-secondary-bg);
    color: var(--btn-secondary-fg);
    cursor: pointer;
    max-width: 200px;
}

.toolbar-options {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 11px;
    color: var(--fg-muted);
    white-space: nowrap;
}

.toolbar-options label {
    display: flex;
    align-items: center;
    gap: 4px;
}

.toolbar-options select {
    font-size: 11px;
    padding: 2px 4px;
    border: 1px solid var(--btn-secondary-border);
    border-radius: 3px;
    background: var(--btn-secondary-bg);
    color: var(--btn-secondary-fg);
    cursor: pointer;
}

.toolbar-btn {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 12px;
    font-size: 12px;
    border: 1px solid transparent;
    border-radius: 3px;
    cursor: pointer;
    white-space: nowrap;
    transition: background 0.1s;
}

.toolbar-btn.primary {
    background: var(--btn-primary-bg);
    color: var(--btn-primary-fg);
}

.toolbar-btn.primary:hover:not(:disabled) {
    background: var(--btn-primary-bg-hover);
}

.toolbar-btn.secondary {
    background: var(--btn-secondary-bg);
    color: var(--btn-secondary-fg);
    border-color: var(--btn-secondary-border);
}

.toolbar-btn.secondary:hover:not(:disabled) {
    background: var(--btn-secondary-bg-hover);
}

.toolbar-btn:disabled {
    background: var(--btn-disabled-bg);
    color: var(--btn-disabled-fg);
    cursor: default;
}

.theme-toggle-btn {
    background: transparent;
    border: none;
    font-size: 18px;
    cursor: pointer;
    padding: 2px 6px;
    border-radius: 3px;
    line-height: 1;
}

.theme-toggle-btn:hover {
    background: var(--bg-hover);
}

/* ── Sample description ── */
.sample-description {
    padding: 4px 12px;
    font-size: 11px;
    color: var(--description-fg);
    background: var(--description-bg);
    border-bottom: 1px solid var(--border-color);
    flex-shrink: 0;
}

/* ── Grid layout: side-by-side input → output ── */
.yaml-grid {
    flex: 1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-template-rows: 1fr;
    gap: 0;
    overflow: hidden;
}

.yaml-grid.with-events {
    grid-template-columns: 1fr 1fr minmax(200px, 0.6fr);
}

.panel-yaml {
    grid-row: 1;
    grid-column: 1;
    border-right: 1px solid var(--border-color);
}

.panel-output {
    grid-row: 1;
    grid-column: 2;
}

.panel-events {
    grid-row: 1;
    grid-column: 3;
    border-left: 1px solid var(--border-color);
}

/* ── Panel ── */
.playground-panel {
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.panel-header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 0 10px;
    height: 28px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--fg-muted);
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    flex-shrink: 0;
    user-select: none;
}

.panel-body {
    flex: 1;
    overflow: hidden;
    position: relative;
    min-height: 0;
}

/* BlazorMonaco editor containers must fill their parent */
.panel-body .monaco-editor-container {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
}

/* ── Error display ── */
.error-output {
    padding: 12px;
    font-family: "Cascadia Code", "Fira Code", Consolas, monospace;
    font-size: 13px;
    color: var(--console-error);
    white-space: pre-wrap;
    word-break: break-word;
    overflow: auto;
    height: 100%;
    background: var(--bg-primary);
}

/* ── Status bar ── */
.status-bar {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 0 12px;
    height: 22px;
    font-size: 11px;
    background: var(--status-bar-bg);
    color: var(--status-bar-fg);
    flex-shrink: 0;
}

.status-bar.error {
    background: var(--status-error-bg);
}

.status-bar .spacer {
    flex: 1;
}

/* ── Panel copy/maximize buttons ── */
.panel-copy-btn, .panel-maximize-btn {
    background: none;
    border: none;
    color: var(--fg-muted);
    cursor: pointer;
    font-size: 14px;
    padding: 0 4px;
    line-height: 1;
}

.panel-copy-btn:hover, .panel-maximize-btn:hover {
    color: var(--fg-secondary);
}

/* ── Maximize/minimize panels ── */
.yaml-grid.has-maximized {
    grid-template-columns: 1fr;
    grid-template-rows: 1fr;
}

.playground-panel.maximized {
    grid-column: 1 / -1;
    grid-row: 1 / -1;
}

.playground-panel.minimized {
    display: none;
}

/* ── Dirty confirmation modal ── */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--modal-overlay-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal-dialog {
    background: var(--modal-bg);
    border: 1px solid var(--modal-border);
    border-radius: 8px;
    padding: 24px;
    max-width: 420px;
    width: 90%;
    color: var(--fg-secondary);
    box-shadow: 0 8px 32px var(--modal-shadow);
}

.modal-dialog h3 {
    margin: 0 0 12px;
    font-size: 16px;
    color: var(--modal-heading-color);
}

.modal-dialog p {
    margin: 0 0 10px;
    font-size: 13px;
    color: var(--modal-text-color);
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 8px;
    margin-top: 16px;
}

/* ── Events toggle button ── */
.events-toggle {
    font-size: 11px;
    padding: 3px 8px;
}

.events-toggle.active {
    background: var(--accent-color);
    color: #fff;
    border-color: var(--accent-color);
}

/* ── Events panel ── */
.events-body {
    overflow: auto;
    background: var(--bg-primary);
}

.events-output {
    margin: 0;
    padding: 8px 12px;
    font-family: "Cascadia Code", "Fira Code", Consolas, monospace;
    font-size: 12px;
    line-height: 1.5;
    color: var(--fg-primary);
    white-space: pre;
    tab-size: 2;
}