:root {
  --primary: #8B5CF6; --primary-hover: #7C3AED; --secondary: #A78BFA;
  --accent: #F97316; --success: #10B981; --error: #EF4444;
  --bg: #0F0A1E; --bg-elevated: #150E2A; --bg-card: #1C1435;
  --bg-input: #110C20; --text: #E8E0F8; --text-muted: #9B8FBF; --text-dim: #5A4D78;
  --border: #2A1F4A; --border-hover: #3D2F6A; --radius: 12px; --radius-sm: 8px;
  --font: 'Inter', system-ui, sans-serif; --mono: 'JetBrains Mono', monospace; --transition: 200ms ease;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
body{font-family:var(--font);background:var(--bg);color:var(--text);min-height:100vh;overflow:hidden}
.app{display:flex;flex-direction:column;height:100vh}

.header{display:flex;align-items:center;justify-content:space-between;padding:10px 16px;background:var(--bg-elevated);border-bottom:1px solid var(--border);gap:8px;flex-shrink:0;flex-wrap:wrap}
.header-left{display:flex;align-items:center;gap:10px}
.logo{font-size:1.2rem}
.header-title{font-size:1rem;font-weight:700;color:var(--secondary)}
.header-right{display:flex;gap:6px;align-items:center;flex-wrap:wrap}
.toggle-label{display:flex;align-items:center;gap:4px;font-size:.68rem;color:var(--text-muted);cursor:pointer}
.toggle-label input{accent-color:var(--primary)}
.select-sm{padding:4px 8px;font-size:.68rem;font-family:var(--font);background:var(--bg-input);border:1px solid var(--border);border-radius:6px;color:var(--text);outline:none}

.btn{display:inline-flex;align-items:center;gap:6px;padding:8px 14px;font-size:.78rem;font-weight:500;font-family:var(--font);border:none;border-radius:var(--radius-sm);cursor:pointer;transition:all var(--transition);white-space:nowrap}
.btn-primary{background:linear-gradient(135deg,var(--primary),var(--primary-hover));color:#fff;box-shadow:0 2px 8px rgba(139,92,246,.3)}
.btn-primary:hover{transform:translateY(-1px);box-shadow:0 4px 16px rgba(139,92,246,.4)}
.btn-ghost{background:transparent;color:var(--text-muted);border:1px solid var(--border)}
.btn-ghost:hover{background:var(--bg-card);color:var(--text);border-color:var(--border-hover)}
.btn-sm{padding:5px 10px;font-size:.72rem}
.btn-xs{padding:3px 8px;font-size:.6rem}

.main{display:grid;grid-template-columns:1fr 1fr;flex:1;overflow:hidden;gap:1px;background:var(--border)}
.editor-panel,.output-panel{background:var(--bg);display:flex;flex-direction:column;overflow:hidden}
.tabs{display:flex;gap:0;overflow-x:auto;border-bottom:1px solid var(--border);flex-shrink:0}
.tab-actions{display:flex;padding:2px 8px;border-bottom:1px solid var(--border)}
.file-tab{padding:6px 14px;font-size:.7rem;font-weight:500;font-family:var(--font);color:var(--text-dim);background:none;border:none;border-bottom:2px solid transparent;cursor:pointer;transition:all var(--transition);display:flex;align-items:center;gap:6px;white-space:nowrap}
.file-tab:hover{color:var(--text-muted)}
.file-tab.active{color:var(--secondary);border-bottom-color:var(--primary)}
.file-tab .close-tab{font-size:.5rem;opacity:.5;cursor:pointer}
.file-tab .close-tab:hover{opacity:1;color:var(--error)}

.code-editor{flex:1;padding:14px;font-family:var(--mono);font-size:.82rem;line-height:1.6;background:var(--bg-input);border:none;color:var(--secondary);resize:none;outline:none;tab-size:2}
.code-editor::placeholder{color:var(--text-dim)}

.output-tabs{display:flex;gap:0;border-bottom:1px solid var(--border);flex-shrink:0}
.out-tab{padding:6px 14px;font-size:.7rem;font-weight:500;font-family:var(--font);color:var(--text-dim);background:none;border:none;border-bottom:2px solid transparent;cursor:pointer;transition:all var(--transition)}
.out-tab:hover{color:var(--text-muted)}
.out-tab.active{color:var(--accent);border-bottom-color:var(--accent)}
.out-content{display:none;flex:1;overflow:auto}
.out-content.active{display:block}
.code-output{padding:14px;font-family:var(--mono);font-size:.78rem;line-height:1.6;color:var(--text-muted);white-space:pre-wrap;word-break:break-all}
.code-output .error{color:var(--error)}
.code-output .log{color:var(--success)}

.toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);padding:10px 20px;background:var(--bg-card);border:1px solid var(--primary);border-radius:var(--radius-sm);color:var(--secondary);font-size:.8rem;font-weight:500;z-index:200;animation:toast-in .3s ease}
@keyframes toast-in{from{opacity:0;transform:translateX(-50%) translateY(10px)}to{opacity:1;transform:translateX(-50%) translateY(0)}}
::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--border);border-radius:3px}
@media(max-width:768px){.main{grid-template-columns:1fr;grid-template-rows:1fr 1fr}}