:root {
    --bg: #0f172a;
    --surface: #1e293b;
    --border: #334155;
    --text: #e2e8f0;
    --muted: #94a3b8;
    --accent: #d97706;
    --green: #4ade80;
    --red: #f87171;
    --font-mono: "SFMono-Regular", Menlo, Monaco, Consolas, monospace;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html, body {
    height: 100%;
    background: var(--bg);
    color: var(--text);
    font-family: system-ui, -apple-system, sans-serif;
}
body {
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

/* ── Top bar ──────────────────────────────────────────────────────── */

.top-bar {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.5rem 1rem;
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
}

.brand {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--accent);
    white-space: nowrap;
}

.logo { height: 28px; width: auto; }

.game-nav {
    display: flex;
    gap: 0.3rem;
    flex-wrap: wrap;
}

.game-nav button {
    font-size: 0.75rem;
    padding: 0.2rem 0.55rem;
    border-radius: 4px;
    background: transparent;
    border: 1px solid var(--border);
    color: var(--muted);
    cursor: pointer;
    transition: all 0.15s;
}

.game-nav button small { opacity: 0.5; font-size: 0.6rem; }
.game-nav button:hover { border-color: var(--accent); color: var(--text); }
.game-nav button.active {
    background: var(--accent);
    color: var(--bg);
    border-color: var(--accent);
}

.top-meta {
    margin-left: auto;
    font-size: 0.75rem;
    color: var(--muted);
}

.isolation-note {
    padding: 0.45rem 1rem;
    border-bottom: 1px solid var(--border);
    background: rgba(217, 119, 6, 0.12);
    color: var(--muted);
    font-size: 0.75rem;
}

.isolation-note code {
    background: rgba(15, 23, 42, 0.8);
    color: var(--text);
    padding: 0.1rem 0.3rem;
    border-radius: 3px;
}

[data-tone="success"] { color: var(--green); }
[data-tone="error"] { color: var(--red); }
[data-tone="info"] { color: var(--accent); }
[data-tone="warn"] { color: #fbbf24; }

/* ── Workspace (editor + output) ──────────────────────────────────── */

.workspace {
    flex: 1;
    display: flex;
    min-height: 0;
}

/* ── Editor pane ──────────────────────────────────────────────────── */

.editor-pane {
    flex: 1;
    display: flex;
    flex-direction: column;
    border-right: 1px solid var(--border);
    min-width: 300px;
}

.editor-toolbar {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.4rem 0.6rem;
    border-bottom: 1px solid var(--border);
    background: var(--surface);
}

.editor-toolbar button,
.editor-toolbar select {
    font-size: 0.8rem;
    padding: 0.3rem 0.6rem;
    border-radius: 4px;
    background: var(--bg);
    border: 1px solid var(--border);
    color: var(--text);
    cursor: pointer;
}

.editor-toolbar button:hover,
.editor-toolbar select:hover { border-color: var(--accent); }

[data-compile-run] {
    background: var(--accent) !important;
    color: var(--bg) !important;
    border-color: var(--accent) !important;
    font-weight: 600;
}

.btn-subtle { opacity: 0.6; }
.btn-subtle:hover { opacity: 1; }
.toolbar-spacer { flex: 1; }

.dropzone-inline {
    position: relative;
    font-size: 0.7rem;
    color: var(--muted);
    cursor: pointer;
}

.dropzone-inline input {
    position: absolute;
    inset: 0;
    opacity: 0;
    cursor: pointer;
}

.editor-wrap {
    flex: 1;
    position: relative;
    overflow: hidden;
}

.editor-highlight, [data-code-editor] {
    position: absolute;
    inset: 0;
    margin: 0;
    padding: 0.75rem;
    font-family: var(--font-mono);
    font-size: 14px;
    line-height: 1.6;
    tab-size: 4;
    white-space: pre-wrap;
    word-wrap: break-word;
    overflow: auto;
    border: none;
}

.editor-highlight {
    color: var(--text);
    background: var(--bg);
    pointer-events: none;
    z-index: 0;
}

[data-code-editor] {
    background: transparent;
    color: transparent;
    caret-color: var(--text);
    resize: none;
    outline: none;
    z-index: 1;
}

/* Syntax colors */
.hl-keyword { color: #c084fc; }
.hl-fn { color: #67e8f9; }
.hl-type { color: #fde68a; }
.hl-builtin { color: #fde68a; }
.hl-string { color: #86efac; }
.hl-desc { color: #86efac; font-style: italic; }
.hl-number { color: #fda4af; }
.hl-constant { color: #fda4af; }
.hl-comment { color: #64748b; font-style: italic; }
.hl-effect { color: #f97316; font-weight: 600; }
.hl-operator { color: #94a3b8; }

/* ── Output pane ──────────────────────────────────────────────────── */

.output-pane {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 300px;
    min-height: 0;
    background: #111827;
}

/* Terminal */
.terminal-wrap {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 0;
    background: #111827;
}

.terminal-surface {
    flex: 1;
    padding: 0.5rem 0.75rem 0 1rem;
    outline: none;
    overflow: hidden;
    box-sizing: border-box;
}

.terminal-canvas {
    image-rendering: pixelated;
}

.terminal-empty {
    position: absolute;
    inset: 0;
    display: none;
    align-items: center;
    justify-content: center;
    color: var(--muted);
    font-size: 0.85rem;
}

.terminal-hint {
    padding: 0.3rem 0.75rem;
    font-size: 0.7rem;
    color: var(--muted);
    border-top: 1px solid var(--border);
}

/* Console */
.console-wrap {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 0;
}

.console-surface {
    flex: 1;
    padding: 0.75rem;
    font-family: var(--font-mono);
    font-size: 13px;
    line-height: 1.5;
    overflow: auto;
    white-space: pre-wrap;
    word-break: break-all;
}

.console-surface .stdout { color: var(--text); }
.console-surface .stderr { color: var(--red); }

.readline-bar {
    display: flex;
    gap: 0.3rem;
    padding: 0.4rem 0.6rem;
    border-top: 1px solid var(--border);
    background: var(--surface);
}

.readline-bar input {
    flex: 1;
    background: var(--bg);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 0.3rem 0.5rem;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    outline: none;
}

.readline-bar input:focus { border-color: var(--accent); }

.readline-bar button {
    background: var(--surface);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 0.3rem 0.6rem;
    font-size: 0.8rem;
    cursor: pointer;
}

/* ── Back button (game mode) ──────────────────────────────────────── */

.back-bar {
    display: none;
    padding: 0.25rem 0.75rem;
    border-bottom: 1px solid var(--border);
}

.back-bar button {
    font-size: 0.75rem;
    padding: 0.15rem 0.5rem;
    border-radius: 3px;
    background: transparent;
    border: 1px solid var(--border);
    color: var(--muted);
    cursor: pointer;
}

.back-bar button:hover { color: var(--text); border-color: var(--accent); }

.workspace[data-mode="game"] .back-bar { display: block; }

/* ── Header links ────────────────────────────────────────────────── */

.intro-link {
    font-size: 0.75rem;
    color: var(--muted);
    text-decoration: none;
    cursor: pointer;
}
.intro-link:hover { color: var(--accent); }

/* ── About overlay ───────────────────────────────────────────────── */

.about-overlay {
    position: fixed;
    inset: 0;
    z-index: 100;
    background: rgba(0,0,0,0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}

.about-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 2rem;
    max-width: 600px;
    width: 100%;
    max-height: 90vh;
    overflow: auto;
    position: relative;
}

.about-close {
    position: absolute;
    top: 0.75rem;
    right: 0.75rem;
    background: none;
    border: none;
    color: var(--muted);
    font-size: 1.5rem;
    cursor: pointer;
    line-height: 1;
}
.about-close:hover { color: var(--text); }

.about-card h2 {
    font-size: 1.5rem;
    color: var(--accent);
    margin-bottom: 0.25rem;
}

.about-tagline {
    color: var(--muted);
    margin-bottom: 1.5rem;
    font-size: 0.95rem;
}

.about-features {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.about-feature strong {
    color: var(--text);
    display: block;
    font-size: 0.85rem;
    margin-bottom: 0.15rem;
}

.about-feature span {
    color: var(--muted);
    font-size: 0.8rem;
    line-height: 1.4;
}

.about-feature code {
    background: var(--bg);
    padding: 0.1rem 0.3rem;
    border-radius: 3px;
    font-size: 0.75rem;
}

.about-example {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 0.75rem;
    font-family: var(--font-mono);
    font-size: 12px;
    line-height: 1.5;
    overflow-x: auto;
    margin-bottom: 1.5rem;
}

.about-links {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.about-links a {
    color: var(--accent);
    text-decoration: none;
    font-size: 0.85rem;
}
.about-links a:hover { text-decoration: underline; }

/* ── Layout modes ─────────────────────────────────────────────────── */

/* When terminal is visible, console hides */
.output-pane[data-mode="terminal"] .console-wrap { display: none; }
.output-pane[data-mode="terminal"] .terminal-wrap { display: flex !important; flex: 1; }

/* When console is active, terminal hides */
.output-pane[data-mode="console"] .terminal-wrap { display: none !important; }
.output-pane[data-mode="console"] .console-wrap { display: flex; flex: 1; }

/* Game mode: editor collapses, output takes full width */
.workspace[data-mode="game"] .editor-pane { display: none; }
.workspace[data-mode="game"] .output-pane { flex: 1; }

.game-layout {
    flex: 1;
    display: flex;
    min-height: 0;
}

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

/* ── Source viewer (game source code) ────────────────────────────── */

.source-viewer {
    display: none;
    flex-direction: column;
    border-right: none;
    min-width: 200px;
    max-width: 70%;
    flex: 1;
    min-height: 0;
    overflow: hidden;
}

.workspace[data-mode="game"] .source-viewer { display: flex; }

/* Draggable divider between source and game */
.game-divider {
    display: none;
    width: 6px;
    cursor: col-resize;
    background: var(--border);
    flex-shrink: 0;
    transition: background 0.15s;
}
.game-divider:hover, .game-divider.dragging { background: var(--accent); }
.workspace[data-mode="game"] .game-divider { display: block; }

.source-tabs {
    display: flex;
    gap: 0;
    border-bottom: 1px solid var(--border);
    background: var(--surface);
    overflow-x: auto;
}

.source-tabs button {
    font-size: 0.75rem;
    padding: 0.35rem 0.75rem;
    background: transparent;
    border: none;
    border-bottom: 2px solid transparent;
    color: var(--muted);
    cursor: pointer;
    white-space: nowrap;
}

.source-tabs button:hover { color: var(--text); }
.source-tabs button.active {
    color: var(--accent);
    border-bottom-color: var(--accent);
}

.source-code {
    flex: 1;
    margin: 0;
    padding: 0.75rem;
    font-family: var(--font-mono);
    font-size: 13px;
    line-height: 1.6;
    color: var(--text);
    background: var(--bg);
    overflow: auto;
    white-space: pre;
    word-wrap: normal;
    tab-size: 4;
    min-height: 0;
}

/* ── Touch controls (mobile gamepad) ─────────────────────────────── */

.touch-controls {
    display: flex;
    gap: 0.9rem;
    padding: 0.75rem 0.85rem 0.8rem;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    justify-content: center;
    align-items: flex-start;
    flex-shrink: 0;
}


.touch-group { text-align: center; }

.touch-label {
    font-size: 0.62rem;
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 0.4rem;
}

.touch-controls button {
    width: 38px;
    height: 38px;
    font-size: 0.8rem;
    border-radius: 8px;
    background: var(--bg);
    border: 1px solid var(--border);
    color: var(--text);
    cursor: pointer;
    touch-action: manipulation;
    -webkit-user-select: none;
    user-select: none;
}

.touch-controls button:active {
    background: var(--accent);
    color: var(--bg);
    border-color: var(--accent);
}

/* Keyboard layout for WASD and arrows */
.touch-grid {
    display: grid;
    grid-template-columns: repeat(3, 40px);
    grid-template-rows: repeat(2, 40px);
    gap: 5px;
}

/* QWE / ASD layout */
.wasd button:nth-child(1) { grid-column: 1; grid-row: 1; } /* Q */
.wasd button:nth-child(2) { grid-column: 2; grid-row: 1; } /* W */
.wasd button:nth-child(3) { grid-column: 3; grid-row: 1; } /* E */
.wasd button:nth-child(4) { grid-column: 1; grid-row: 2; } /* A */
.wasd button:nth-child(5) { grid-column: 2; grid-row: 2; } /* S */
.wasd button:nth-child(6) { grid-column: 3; grid-row: 2; } /* D */

/*   ↑  / ←↓→ layout */
.arrows button:nth-child(1) { grid-column: 2; grid-row: 1; } /* ↑ */
.arrows button:nth-child(2) { grid-column: 1; grid-row: 2; } /* ← */
.arrows button:nth-child(3) { grid-column: 2; grid-row: 2; } /* ↓ */
.arrows button:nth-child(4) { grid-column: 3; grid-row: 2; } /* → */

.touch-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 5px;
    max-width: 144px;
}


/* ── Responsive ──────────────────────────────────────────────────── */

@media (max-width: 1024px) {
    .top-bar {
        flex-wrap: wrap;
        gap: 0.4rem;
    }
    .intro-link { display: none; }
    .game-nav { order: 3; width: 100%; }

    .workspace {
        flex-direction: column;
    }
    .editor-pane {
        min-width: 0;
        max-height: 40vh;
        border-right: none;
        border-bottom: 1px solid var(--border);
    }
    .output-pane {
        min-width: 0;
        min-height: 200px;
    }
    .source-viewer {
        max-width: 100%;
        max-height: 40vh;
        min-width: 0;
        border-right: none;
        border-bottom: 1px solid var(--border);
    }
    .game-layout {
        flex-direction: column;
    }
    .workspace[data-mode="game"] .source-viewer {
        display: none;
    }
}