@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=JetBrains+Mono:wght@400;500&display=swap');
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{--primary:#8B5CF6;--secondary:#A78BFA;--accent:#C4B5FD;--bg:#0F172A;--surface:#1E293B;--surface2:#334155;--text:#E2E8F0;--text-dim:#94A3B8;--border:#334155;--success:#22C55E;--error:#EF4444;--radius:12px;--font:'Inter',system-ui,sans-serif;--mono:'JetBrains Mono','Courier New',monospace}
html{font-family:var(--font);background:var(--bg);color:var(--text);line-height:1.6}
body{min-height:100vh;display:flex;flex-direction:column}
.header{padding:.65rem 1.25rem;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--border);flex-wrap:wrap;gap:.5rem}
.header h1{font-size:1rem;font-weight:800;background:linear-gradient(135deg,var(--primary),var(--accent));-webkit-background-clip:text;-webkit-text-fill-color:transparent}
.header-actions{display:flex;gap:.3rem}
.btn{padding:.35rem .7rem;border-radius:8px;font-size:.72rem;font-weight:600;cursor:pointer;border:none;transition:all .15s;font-family:var(--font)}
.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover{opacity:.85}
.btn-ghost{background:transparent;border:1px solid var(--border);color:var(--text-dim)}.btn-ghost:hover{background:var(--surface2);color:var(--text)}
.main{flex:1;display:grid;grid-template-columns:1fr 1fr;gap:0;overflow:hidden}
.panel{display:flex;flex-direction:column}
.panel-header{padding:.35rem .75rem;background:var(--surface);border-bottom:1px solid var(--border);font-size:.7rem;font-weight:700;color:var(--text-dim);display:flex;justify-content:space-between;align-items:center}
.hint{font-size:.6rem;color:var(--text-dim);font-weight:500}
.editor-panel{border-right:1px solid var(--border)}
.editor{flex:1;padding:.5rem;background:var(--bg);color:var(--text);font-family:var(--mono);font-size:.78rem;border:none;outline:none;resize:none;line-height:1.6;tab-size:2;white-space:pre}
.output{flex:1;padding:.5rem .75rem;background:var(--bg);font-family:var(--mono);font-size:.78rem;color:var(--secondary);overflow:auto;margin:0;white-space:pre-wrap;line-height:1.6}
.error-bar{padding:.25rem .75rem;font-size:.68rem;color:var(--error);background:rgba(239,68,68,.05);min-height:20px;border-top:1px solid var(--border)}
.toast{position:fixed;bottom:1.5rem;right:1.5rem;background:var(--surface);border:1px solid var(--primary);color:var(--primary);padding:.4rem .8rem;border-radius:8px;font-size:.72rem;z-index:200;transform:translateY(80px);opacity:0;transition:all .3s}
.toast.show{transform:translateY(0);opacity:1}
@media(max-width:768px){.main{grid-template-columns:1fr;grid-template-rows:1fr 1fr}.editor-panel{border-right:none;border-bottom:1px solid var(--border)}}