:root {
    --bg-primary: #1e1e1e;
    --bg-secondary: #252526;
    --bg-tertiary: #2d2d2d;
    --border: #3e3e42;
    --text-primary: #cccccc;
    --text-secondary: #969696;
    --accent: #4ec9b0;
    --accent-hover: #5edbc2;
    --error: #f44747;
    --warning: #cca700;
    --success: #6a9955;
    --tab-active: #1e1e1e;
    --tab-inactive: #2d2d2d;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    height: 100%;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    overflow: hidden;
}

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

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

.header h1 {
    font-size: 16px;
    font-weight: 600;
    color: var(--accent);
    white-space: nowrap;
}

.header select {
    padding: 4px 8px;
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border);
    border-radius: 4px;
    font-size: 13px;
    cursor: pointer;
}

.header select:focus {
    outline: 1px solid var(--accent);
}

.btn-compile {
    padding: 5px 16px;
    background: var(--accent);
    color: #1e1e1e;
    border: none;
    border-radius: 4px;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    white-space: nowrap;
}

.btn-compile:hover {
    background: var(--accent-hover);
}

.btn-compile:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.header-spacer {
    flex: 1;
}

.header-links {
    display: flex;
    gap: 12px;
    font-size: 13px;
}

.header-links a {
    color: var(--text-secondary);
    text-decoration: none;
}

.header-links a:hover {
    color: var(--text-primary);
}

/* Editor panels */
.editor-container {
    flex: 1;
    display: flex;
    overflow: hidden;
}

.panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.panel-divider {
    width: 4px;
    background: var(--border);
    cursor: default;
    flex-shrink: 0;
}

.panel-divider:hover {
    background: var(--border);
}

.panel-header {
    display: flex;
    align-items: center;
    padding: 0 12px;
    height: 32px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    font-size: 12px;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    flex-shrink: 0;
}

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

/* Monaco editor containers need explicit dimensions */
.panel-body > div {
    width: 100%;
    height: 100%;
}

/* Tabs */
.tab-bar {
    display: flex;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
}

.tab {
    padding: 6px 16px;
    font-size: 12px;
    color: var(--text-secondary);
    background: var(--tab-inactive);
    border: none;
    border-right: 1px solid var(--border);
    cursor: pointer;
    white-space: nowrap;
}

.tab:hover {
    color: var(--text-primary);
}

.tab.active {
    color: var(--text-primary);
    background: var(--tab-active);
    border-bottom: 2px solid var(--accent);
}

/* Status indicator */
.status-indicator {
    margin-left: auto;
    padding: 0 12px;
    font-size: 11px;
}

.status-indicator.success {
    color: var(--success);
}

.status-indicator.error {
    color: var(--error);
}

.status-indicator.compiling {
    color: var(--warning);
}

/* Loading screen */
.loading {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
    background: var(--bg-primary);
}

.loading-content {
    text-align: center;
}

.loading-content h1 {
    color: var(--accent);
    margin-bottom: 12px;
}

.loading-content p {
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.spinner {
    width: 32px;
    height: 32px;
    border: 3px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin: 0 auto;
}

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

/* Blazor error UI */
#blazor-error-ui {
    display: none;
    position: fixed;
    bottom: 0;
    width: 100%;
    padding: 8px;
    background: var(--error);
    color: white;
    text-align: center;
    font-size: 13px;
    z-index: 1000;
}

#blazor-error-ui .reload,
#blazor-error-ui .dismiss {
    color: white;
    margin-left: 12px;
}