:root{--bg: #f7f8fa;--panel: #ffffff;--panel-elev: #ffffff;--ink: #0f172a;--ink-soft: #334155;--muted: #64748b;--border: #e2e8f0;--border-strong: #cbd5e1;--accent: #2563eb;--accent-hover: #1d4ed8;--accent-fg: #ffffff;--ok: #15803d;--ok-bg: #dcfce7;--err: #b91c1c;--err-bg: #fee2e2;--warn: #a16207;--warn-bg: #fef3c7;--editor-bg: #ffffff;--mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace}@media (prefers-color-scheme: dark){:root{--bg: #0b0e14;--panel: #121722;--panel-elev: #1a2030;--ink: #e6edf3;--ink-soft: #cbd5e1;--muted: #8b95a7;--border: #22293a;--border-strong: #2f3a52;--accent: #3b82f6;--accent-hover: #60a5fa;--accent-fg: #ffffff;--ok: #4ade80;--ok-bg: rgba(74, 222, 128, .12);--err: #f87171;--err-bg: rgba(248, 113, 113, .12);--warn: #fbbf24;--warn-bg: rgba(251, 191, 36, .12);--editor-bg: #0f1420}}*{box-sizing:border-box}html,body{margin:0;padding:0;height:100%;background:var(--bg);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;font-size:14px;line-height:1.5;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{display:flex;flex-direction:column;min-height:100vh}.topbar{display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:.75rem 1rem;padding:.75rem 1rem;border-bottom:1px solid var(--border);background:var(--panel)}.topbar h1{font-size:1.05rem;margin:0;font-weight:600;letter-spacing:-.01em;color:var(--ink)}.tagline{color:var(--muted);font-size:.85rem;margin:0}.actions{display:flex;gap:.6rem;align-items:center;flex-wrap:wrap}.example-picker,.encoding-picker,.collation-picker{font-size:.82rem;color:var(--muted);display:flex;align-items:center;gap:.4rem}.example-picker select,.encoding-picker select,.collation-picker 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var(--accent);outline-offset:1px}button.primary{background:var(--accent);color:var(--accent-fg);border-color:var(--accent);font-weight:600}button.primary:hover{background:var(--accent-hover);border-color:var(--accent-hover)}main{display:grid;grid-template-columns:1fr 1fr;gap:1rem;padding:1rem;flex:1;min-height:0}@media (max-width: 860px){main{grid-template-columns:1fr}}.pane{display:flex;flex-direction:column;background:var(--panel);border:1px solid var(--border);border-radius:10px;overflow:hidden;min-height:24rem;transition:border-color .2s ease,box-shadow .2s ease}.pane--highlight{border-color:var(--accent);box-shadow:0 0 0 3px color-mix(in srgb,var(--accent) 25%,transparent)}.pane-head{display:flex;align-items:center;justify-content:space-between;padding:.55rem .8rem;border-bottom:1px solid var(--border);background:var(--panel)}.pane-head h2{font-size:.78rem;font-weight:600;margin:0;color:var(--muted);text-transform:uppercase;letter-spacing:.06em}.pane-actions{display:flex;gap:.35rem}.pane-actions button{font-size:.78rem;padding:.22rem .55rem}.editor{flex:1;min-height:0;font-family:var(--mono);font-size:13px;overflow:auto;background:var(--editor-bg)}.editor .cm-editor{height:100%}.editor .cm-scroller{font-family:var(--mono)}.editor .cm-editor{background:var(--editor-bg);color:var(--ink)}.editor .cm-gutters{background:var(--bg);color:var(--muted);border-right:1px solid var(--border)}.editor .cm-activeLineGutter,.editor .cm-activeLine{background:color-mix(in srgb,var(--accent) 8%,transparent)}.editor .cm-selectionBackground,.editor .cm-content ::selection{background:color-mix(in srgb,var(--accent) 30%,transparent)!important}.editor .cm-cursor{border-left-color:var(--accent)}.pane-foot{padding:.55rem .8rem;border-top:1px solid 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