*, *::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;
    --bg-selected: #094771;
    --bg-related: #1e3a4f;
    --fg-primary: #d4d4d4;
    --fg-secondary: #e0e0e0;
    --fg-heading: #cccccc;
    --fg-muted: #808080;
    --fg-dimmed: #555;
    --border-color: #3c3c3c;
    --border-light: #333;
    --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;
    --tab-bg: #1a1a2e;
    --tab-fg: #606080;
    --tab-hover-fg: #c0c0c0;
    --tab-hover-bg: #252540;
    --tab-active-fg: #e0e0e0;
    --tab-active-bg: #1e1e1e;
    --tab-border: #2a2a3e;
    --tab-root-fg: #b0b0c0;
    --tab-root-border: #3a9a5c;
    --tab-root-active-border: #4ec970;
    --tab-badge-bg: #2a2a3e;
    --tab-badge-fg: #505070;
    --tab-badge-border: #404060;
    --tab-badge-hover-bg: #303050;
    --tab-badge-hover-fg: #80c090;
    --tab-badge-active-bg: #1a3a25;
    --tab-badge-active-fg: #4ec970;
    --tab-badge-active-border: #3a9a5c;
    --tab-rename-bg: #1e1e2e;
    --tab-close-hover: #e04040;
    --badge-bg: #0e639c;
    --badge-fg: #fff;
    --type-name-color: #4ec9b0;
    --type-kind-color: #808080;
    --const-value-color: #b5cea8;
    --prop-name-color: #9cdcfe;
    --prop-required-color: #ce9178;
    --prop-composed-color: #6a9fb5;
    --composition-header-color: #c586c0;
    --tuple-name-color: #dcdcaa;
    --console-error: #f48771;
    --console-info: #3794ff;
    --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;
    --related-border-color: #4ec9b0;
}

[data-theme="light"] {
    --bg-primary: #ffffff;
    --bg-secondary: #f3f3f3;
    --bg-tertiary: #e0e0e0;
    --bg-hover: #e8e8e8;
    --bg-selected: #c8ddf0;
    --bg-related: #dceefb;
    --fg-primary: #1e1e1e;
    --fg-secondary: #333333;
    --fg-heading: #444444;
    --fg-muted: #666666;
    --fg-dimmed: #999;
    --border-color: #d4d4d4;
    --border-light: #e0e0e0;
    --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;
    --tab-bg: #f0f0f5;
    --tab-fg: #888899;
    --tab-hover-fg: #444;
    --tab-hover-bg: #e4e4ee;
    --tab-active-fg: #1e1e1e;
    --tab-active-bg: #ffffff;
    --tab-border: #d8d8e8;
    --tab-root-fg: #555;
    --tab-root-border: #3a9a5c;
    --tab-root-active-border: #2d8049;
    --tab-badge-bg: #e8e8f0;
    --tab-badge-fg: #777;
    --tab-badge-border: #c8c8d8;
    --tab-badge-hover-bg: #d8d8e8;
    --tab-badge-hover-fg: #2d8049;
    --tab-badge-active-bg: #d4eedd;
    --tab-badge-active-fg: #2d8049;
    --tab-badge-active-border: #3a9a5c;
    --tab-rename-bg: #fff;
    --tab-close-hover: #d32f2f;
    --badge-bg: #0066b8;
    --badge-fg: #fff;
    --type-name-color: #267f6e;
    --type-kind-color: #666;
    --const-value-color: #098658;
    --prop-name-color: #0451a5;
    --prop-required-color: #b5461b;
    --prop-composed-color: #4078a0;
    --composition-header-color: #9b4dca;
    --tuple-name-color: #795e26;
    --console-error: #d32f2f;
    --console-info: #0066b8;
    --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;
    --related-border-color: #267f6e;
}

@media (prefers-color-scheme: light) {
    :root:not([data-theme="dark"]) {
        --bg-primary: #ffffff;
        --bg-secondary: #f3f3f3;
        --bg-tertiary: #e0e0e0;
        --bg-hover: #e8e8e8;
        --bg-selected: #c8ddf0;
        --bg-related: #dceefb;
        --fg-primary: #1e1e1e;
        --fg-secondary: #333333;
        --fg-heading: #444444;
        --fg-muted: #666666;
        --fg-dimmed: #999;
        --border-color: #d4d4d4;
        --border-light: #e0e0e0;
        --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;
        --tab-bg: #f0f0f5;
        --tab-fg: #888899;
        --tab-hover-fg: #444;
        --tab-hover-bg: #e4e4ee;
        --tab-active-fg: #1e1e1e;
        --tab-active-bg: #ffffff;
        --tab-border: #d8d8e8;
        --tab-root-fg: #555;
        --tab-root-border: #3a9a5c;
        --tab-root-active-border: #2d8049;
        --tab-badge-bg: #e8e8f0;
        --tab-badge-fg: #777;
        --tab-badge-border: #c8c8d8;
        --tab-badge-hover-bg: #d8d8e8;
        --tab-badge-hover-fg: #2d8049;
        --tab-badge-active-bg: #d4eedd;
        --tab-badge-active-fg: #2d8049;
        --tab-badge-active-border: #3a9a5c;
        --tab-rename-bg: #fff;
        --tab-close-hover: #d32f2f;
        --badge-bg: #0066b8;
        --badge-fg: #fff;
        --type-name-color: #267f6e;
        --type-kind-color: #666;
        --const-value-color: #098658;
        --prop-name-color: #0451a5;
        --prop-required-color: #b5461b;
        --prop-composed-color: #4078a0;
        --composition-header-color: #9b4dca;
        --tuple-name-color: #795e26;
        --console-error: #d32f2f;
        --console-info: #0066b8;
        --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;
        --related-border-color: #267f6e;
    }
}

html, body {
    margin: 0;
    padding: 0;
    height: 100vh;
    overflow: hidden;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--bg-primary);
    color: var(--fg-primary);
}

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

/* Toolbar */
.playground-toolbar {
    display: flex;
    align-items: center;
    padding: 8px 16px;
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    gap: 12px;
    flex-shrink: 0;
}

.playground-toolbar h1 {
    font-size: 16px;
    font-weight: 600;
    margin: 0;
    color: var(--fg-secondary);
    white-space: nowrap;
}

.playground-toolbar .spacer {
    flex: 1;
}

.toolbar-btn {
    padding: 6px 16px;
    border: none;
    border-radius: 4px;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.15s;
}

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

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

.toolbar-btn.primary:disabled {
    background-color: var(--btn-disabled-bg);
    color: var(--btn-disabled-fg);
    cursor: not-allowed;
}

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

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

.toolbar-select {
    padding: 4px 8px;
    background-color: var(--btn-secondary-bg);
    color: var(--btn-secondary-fg);
    border: 1px solid var(--btn-secondary-border);
    border-radius: 4px;
    font-size: 13px;
}

/* Theme toggle */
.theme-toggle-btn {
    background: none;
    border: none;
    color: var(--fg-muted);
    cursor: pointer;
    font-size: 18px;
    padding: 2px 6px;
    line-height: 1;
    transition: color 0.15s;
    title: "Toggle theme";
}

.theme-toggle-btn:hover {
    color: var(--fg-secondary);
}

/* Main layout: 2x2 grid */
.playground-grid {
    flex: 1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-template-rows: 1fr 1fr;
    gap: 1px;
    background-color: var(--border-color);
    overflow: hidden;
}

.playground-panel {
    display: flex;
    flex-direction: column;
    background-color: var(--bg-primary);
    overflow: hidden;
}

.panel-header {
    display: flex;
    align-items: center;
    padding: 4px 12px;
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    font-size: 12px;
    font-weight: 600;
    color: var(--fg-heading);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    flex-shrink: 0;
    gap: 8px;
}

.panel-header .spacer {
    flex: 1;
}

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

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

/* Schema file tabs */
.schema-tabs-wrapper {
    display: flex;
    align-items: center;
    background: var(--tab-bg);
    border-bottom: 1px solid var(--border-light);
    flex-shrink: 0;
    position: relative;
}

.schema-tabs-scroll {
    display: flex;
    align-items: center;
    gap: 0;
    overflow: hidden;
    flex: 1;
    padding: 0 2px;
    scroll-behavior: smooth;
}

.schema-tabs-scroll-btn {
    background: var(--tab-bg);
    border: none;
    color: var(--tab-fg);
    cursor: pointer;
    font-size: 18px;
    font-weight: bold;
    padding: 2px 6px;
    line-height: 1;
    flex-shrink: 0;
    z-index: 1;
    transition: color 0.15s, background 0.15s;
}

.schema-tabs-scroll-btn:hover {
    color: var(--fg-secondary);
    background: var(--tab-hover-bg);
}

.schema-tab {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 4px 8px;
    font-size: 12px;
    color: var(--tab-fg);
    cursor: pointer;
    border-right: 1px solid var(--tab-border);
    white-space: nowrap;
    user-select: none;
    border-top: 2px solid transparent;
    transition: color 0.15s, background 0.15s, border-color 0.15s;
}

.schema-tab:hover {
    color: var(--tab-hover-fg);
    background: var(--tab-hover-bg);
}

.schema-tab.active {
    color: var(--tab-active-fg);
    background: var(--tab-active-bg);
    border-bottom: 2px solid var(--accent-color);
}

.schema-tab.root-type {
    color: var(--tab-root-fg);
    border-top: 2px solid var(--tab-root-border);
}

.schema-tab.root-type.active {
    color: var(--tab-active-fg);
    border-top: 2px solid var(--tab-root-active-border);
}

.schema-tab-root-badge {
    background: var(--tab-badge-bg);
    border: 1px solid var(--tab-badge-border);
    border-radius: 3px;
    cursor: pointer;
    font-size: 9px;
    font-weight: 600;
    letter-spacing: 0.5px;
    padding: 1px 5px;
    color: var(--tab-badge-fg);
    text-transform: uppercase;
    line-height: 1.3;
    transition: all 0.15s;
}

.schema-tab-root-badge:hover {
    background: var(--tab-badge-hover-bg);
    color: var(--tab-badge-hover-fg);
    border-color: var(--tab-root-active-border);
}

.schema-tab-root-badge.is-root {
    background: var(--tab-badge-active-bg);
    color: var(--tab-badge-active-fg);
    border-color: var(--tab-badge-active-border);
}

.schema-tab-name {
    max-width: 120px;
    overflow: hidden;
    text-overflow: ellipsis;
}

.schema-tab-rename-btn {
    background: none;
    border: none;
    color: transparent;
    cursor: pointer;
    font-size: 11px;
    padding: 0 2px;
    line-height: 1;
    transition: color 0.15s;
}

.schema-tab:hover .schema-tab-rename-btn {
    color: var(--tab-fg);
}

.schema-tab-rename-btn:hover {
    color: var(--tab-hover-fg) !important;
}

.schema-tab-rename-input {
    background: var(--tab-rename-bg);
    border: 1px solid var(--accent-color);
    border-radius: 2px;
    color: var(--fg-secondary);
    font-size: 12px;
    padding: 1px 4px;
    width: 90px;
    outline: none;
}

.schema-tab-close {
    background: none;
    border: none;
    color: var(--fg-dimmed);
    cursor: pointer;
    font-size: 14px;
    padding: 0 2px;
    line-height: 1;
}

.schema-tab-close:hover {
    color: var(--tab-close-hover);
}

.schema-tab-add {
    background: none;
    border: none;
    color: var(--fg-dimmed);
    cursor: pointer;
    font-size: 16px;
    padding: 4px 8px;
    line-height: 1;
}

.schema-tab-add:hover {
    color: var(--fg-secondary);
}

/* Maximized panel takes the full grid area */
.playground-grid.has-maximized {
    grid-template-columns: 1fr;
    grid-template-rows: 1fr;
}

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

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

.panel-header .badge {
    font-size: 10px;
    padding: 1px 6px;
    border-radius: 8px;
    background-color: var(--badge-bg);
    color: var(--badge-fg);
    font-weight: 400;
}

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

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

/* Type map tree */
.type-map-tree {
    padding: 0;
    overflow-y: auto;
    height: 100%;
    font-size: 13px;
    line-height: 1.6;
    display: flex;
    flex-direction: column;
}

.type-map-search {
    position: relative;
    padding: 6px 8px;
    border-bottom: 1px solid var(--border-color);
    flex-shrink: 0;
}

.type-map-search-input {
    width: 100%;
    box-sizing: border-box;
    padding: 4px 24px 4px 8px;
    background: var(--bg-input);
    color: var(--fg-primary);
    border: 1px solid var(--border-color);
    border-radius: 3px;
    font-size: 12px;
    font-family: inherit;
    outline: none;
}

.type-map-search-input:focus {
    border-color: var(--focus-border-color);
}

.type-map-search-input::placeholder {
    color: var(--fg-muted);
}

.type-map-search-clear {
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--fg-muted);
    cursor: pointer;
    font-size: 12px;
    padding: 2px 4px;
    line-height: 1;
}

.type-map-search-clear:hover {
    color: var(--fg-primary);
}

.type-map-tree > ul {
    padding: 8px;
    overflow-y: auto;
    flex: 1;
    min-height: 0;
}

.type-map-tree ul {
    list-style: none;
    padding-left: 16px;
    margin: 0;
}

.type-map-toggle {
    display: inline-block;
    width: 14px;
    font-size: 9px;
    text-align: center;
    cursor: pointer;
    color: var(--fg-muted);
    transition: transform 0.15s ease;
    user-select: none;
    flex-shrink: 0;
}

.type-map-toggle.expanded {
    transform: rotate(90deg);
}

.type-map-toggle:hover {
    color: var(--fg-primary);
}

.type-map-toggle-spacer {
    display: inline-block;
    width: 14px;
    flex-shrink: 0;
}

.type-map-entry {
    cursor: pointer;
    padding: 2px 4px;
    border-radius: 3px;
    display: flex;
    align-items: baseline;
}

.type-map-entry-content {
    flex: 1;
    min-width: 0;
}

.type-map-entry:hover {
    background-color: var(--bg-hover);
}

.type-map-entry.selected {
    background-color: var(--bg-selected);
}

.type-map-entry.related {
    background-color: var(--bg-related);
    border-left: 2px solid var(--related-border-color);
}

.type-name {
    color: var(--type-name-color);
    font-weight: 600;
}

.type-kind {
    color: var(--type-kind-color);
    font-size: 11px;
    margin-left: 4px;
}

.prop-name {
    color: var(--prop-name-color);
}

.prop-type {
    color: var(--fg-muted);
    font-size: 11px;
    margin-left: 4px;
}

.prop-required {
    color: var(--prop-required-color);
    font-size: 10px;
    margin-left: 4px;
}

.prop-composed {
    color: var(--prop-composed-color);
    font-size: 10px;
    margin-left: 4px;
    font-style: italic;
}

.type-array-item {
    color: var(--type-name-color);
    font-size: 11px;
    margin-left: 2px;
    opacity: 0.8;
}

.type-const-value {
    color: var(--const-value-color);
    font-size: 11px;
    margin-left: 4px;
    font-family: 'JetBrains Mono', monospace;
}

.type-map-composition-header {
    color: var(--composition-header-color);
    font-size: 11px;
    font-weight: 600;
    padding: 2px 4px;
    letter-spacing: 0.3px;
}

.composition-member .type-name {
    color: var(--type-name-color);
    font-weight: normal;
    font-size: 12px;
}

.tuple-item .prop-name {
    color: var(--tuple-name-color);
}

.tuple-item .prop-type {
    color: var(--fg-muted);
    font-size: 11px;
}

/* Console output */
.console-output {
    padding: 8px 12px;
    overflow-y: auto;
    height: 100%;
    font-family: "Cascadia Mono", "Fira Code", "Consolas", monospace;
    font-size: 13px;
    line-height: 1.5;
    white-space: pre-wrap;
    word-break: break-all;
}

.console-output .error {
    color: var(--console-error);
}

.console-output .info {
    color: var(--console-info);
}

.console-output .success {
    color: var(--console-success);
}

/* Status bar */
.status-bar {
    display: flex;
    align-items: center;
    padding: 2px 12px;
    background-color: var(--status-bar-bg);
    color: var(--status-bar-fg);
    font-size: 12px;
    flex-shrink: 0;
    gap: 16px;
}

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

.status-bar .status-item {
    white-space: nowrap;
}

.status-spinner {
    display: inline-block;
    width: 12px;
    height: 12px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    flex-shrink: 0;
}

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

.console-progress {
    color: var(--console-info);
    font-style: italic;
}

.console-success {
    color: var(--console-success);
}

/* 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);
}

.dirty-file-list {
    margin: 8px 0 16px;
    padding-left: 20px;
    font-size: 13px;
    color: var(--fg-secondary);
    font-family: 'Cascadia Code', 'Fira Code', monospace;
}

.dirty-file-list li {
    margin: 4px 0;
}

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