:root{--bg:#0b0d10;--fg:#e8eaf0;--muted:#9aa3b2;--panel:#11141a;--acc:#4aa7ff;--br:16px}
*{box-sizing:border-box}html,body{height:100%}body{margin:0;background:var(--bg);color:var(--fg);font:14px/1.5 ui-monospace,SFMono-Regular,Consolas,Monaco,monospace;display:grid;grid-template-rows:auto 1fr}
header{display:flex;gap:12px;align-items:center;justify-content:space-between;padding:14px 16px;background:linear-gradient(180deg,#0d1016,transparent)}
.h-left{display:flex;align-items:center;gap:12px}
h1{margin:0;font:600 14px/1 ui-sans-serif,system-ui,"Apple SD Gothic Neo",Pretendard,Segoe UI,Arial}
.badge{padding:4px 8px;border-radius:999px;background:rgba(74,167,255,.12);color:var(--acc);font-weight:600}
.toolbar{display:flex;gap:8px}
button{border:0;background:#1a2230;color:var(--fg);padding:10px 14px;border-radius:12px;cursor:pointer;transition:.15s;user-select:none}
button:hover{transform:translateY(-1px);background:#202a3a}
button.primary{background:var(--acc);color:#000;font-weight:700}
button.primary:hover{background:#63b5ff}
.main{display:grid;grid-template-columns:1fr 1fr;gap:14px;padding:14px;height:100%}
.pane{background:var(--panel);border:1px solid #1a1f28;border-radius:var(--br);display:flex;flex-direction:column;min-height:0}
.pane h2{margin:0;padding:12px 12px;border-bottom:1px solid #1a1f28;color:var(--muted);font:600 12px/1 ui-sans-serif,system-ui}
#editor{flex:1;width:100%;padding:12px;background:transparent;color:var(--fg);border:0;outline:0;resize:none}
.hint{padding:8px 12px;color:var(--muted);border-top:1px solid #1a1f28;font-size:12px}
#log{flex:1;margin:0;padding:12px;white-space:pre-wrap;overflow:auto}
.footer{display:flex;gap:10px;align-items:center;padding:10px 12px;border-top:1px solid #1a1f28;color:var(--muted);font-size:12px}
.sep{opacity:.3}
@media (max-width:1000px){.main{grid-template-columns:1fr}}