:root {
    --bg-main: #1e1e1e;
    --bg-panel: #252526;
    --bg-input: #3c3c3c;
    --text-main: #cccccc;
    --text-muted: #858585;
    --accent: #007acc;
    --accent-hover: #0098ff;
    --error: #f48771;
    --success: #89d185;
    --border: #3c3c3c;
    --font-mono: 'Consolas', 'Courier New', monospace;
    --font-sans: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

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

body {
    background-color: var(--bg-main);
    color: var(--text-main);
    font-family: var(--font-sans);
    line-height: 1.5;
    height: 100vh;
    display: flex;
    flex-direction: column;
}

.sandbox-container {
    display: grid;
    grid-template-columns: 2fr 1fr;
    grid-template-rows: 2fr 1fr;
    gap: 1px;
    background-color: var(--border);
    height: 100vh;
    width: 100vw;
}

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

.panel-header {
    background-color: #2d2d2d;
    padding: 8px 16px;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-muted);
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border);
}

.toolbar {
    display: flex;
    gap: 8px;
}

button {
    background-color: var(--bg-input);
    color: var(--text-main);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 4px 12px;
    font-size: 12px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: all 0.2s;
}

button:hover {
    background-color: var(--accent);
    border-color: var(--accent);
    color: #fff;
}

button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    background-color: var(--bg-input) !important;
    border-color: var(--border) !important;
}

.run-btn { background-color: var(--accent); color: #fff; border-color: var(--accent); }

.editor-container {
    flex-grow: 1;
    overflow: hidden;
    position: relative;
    display: flex;
    flex-direction: column;
}

/* CodeMirror Overrides */
.CodeMirror {
    height: 100%;
    flex-grow: 1;
    font-family: var(--font-mono) !important;
    font-size: 14px;
}

/* Debugger Active Line Highlight */
.active-line {
    background-color: rgba(100, 149, 237, 0.3) !important;
}

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

.variables-content {
    padding: 16px;
    font-family: var(--font-mono);
    font-size: 13px;
    overflow-y: auto;
    flex-grow: 1;
}

.var-row {
    display: flex;
    margin-bottom: 8px;
    border-bottom: 1px solid var(--border);
    padding-bottom: 4px;
}

.var-name {
    color: #9cdcfe;
    width: 40%;
    font-weight: bold;
}

.var-value {
    color: #ce9178;
    width: 60%;
    word-break: break-all;
}

.var-value.number { color: #b5cea8; }
.var-value.boolean { color: #569cd6; }
.var-value.collection { color: #dcdcaa; }

.terminal-panel {
    grid-column: 1 / span 2;
    grid-row: 2;
}

.terminal-content {
    padding: 16px;
    font-family: var(--font-mono);
    font-size: 13px;
    overflow-y: auto;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.term-line {
    margin-bottom: 4px;
    white-space: pre-wrap;
}

.term-error { color: var(--error); }
.term-success { color: var(--success); }
.term-system { color: var(--text-muted); font-style: italic; }

.term-input-line {
    display: flex;
    align-items: center;
    margin-top: 4px;
}

.term-prompt {
    color: var(--accent);
    margin-right: 8px;
}

.term-input {
    background: transparent;
    border: none;
    color: var(--text-main);
    font-family: var(--font-mono);
    font-size: 13px;
    flex-grow: 1;
    outline: none;
}

.hidden { display: none !important; }

/* Embed Mode Overrides */
.pseudo-sandbox {
    display: none; 
}
.embedded-sandbox {
    height: 500px;
    border: 1px solid var(--border);
    border-radius: 8px;
    overflow: hidden;
    margin: 16px 0;
}

/* Mobile Layout */
@media (max-width: 768px) {
    .sandbox-container {
        display: flex;
        flex-direction: column;
    }
    .panel {
        flex: none;
        border-bottom: 1px solid var(--border);
    }
    .editor-panel { height: 40vh; }
    .variables-panel { height: 25vh; }
    .terminal-panel { height: 35vh; }
}