:root {
  --primary: #14B8A6; --primary-hover: #0D9488; --secondary: #2DD4BF;
  --accent: #F59E0B; --success: #10B981; --error: #EF4444; --warning: #F59E0B;
  --bg: #0A1A1A; --bg-elevated: #0F2525; --bg-card: #142E2E;
  --bg-input: #0C1F1F; --text: #E0F5F0; --text-muted: #80B8B0; --text-dim: #446B65;
  --border: #1E3D3D; --border-hover: #2D5A5A; --radius: 12px; --radius-sm: 8px;
  --font: 'Inter', system-ui, sans-serif; --mono: monospace; --transition: 200ms ease;
  --add: #10B981; --drop: #EF4444; --modify: #F59E0B;
}
*,*::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-x:hidden}
.app{display:flex;flex-direction:column;min-height:100vh}

.header{display:flex;align-items:center;justify-content:space-between;padding:12px 20px;background:var(--bg-elevated);border-bottom:1px solid var(--border);gap:12px;flex-shrink:0}
.header-left{display:flex;align-items:center;gap:12px}
.logo{font-size:1.3rem}
.header-title{font-size:1.05rem;font-weight:700;background:linear-gradient(135deg,var(--primary),var(--secondary));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.header-right{display:flex;gap:8px;align-items:center}
.select-sm{padding:5px 10px;font-size:.72rem;font-family:var(--font);background:var(--bg-input);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text);cursor:pointer}

.btn{display:inline-flex;align-items:center;gap:6px;padding:8px 14px;font-size:.8rem;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(20,184,166,.3)}
.btn-primary:hover{transform:translateY(-1px);box-shadow:0 4px 16px rgba(20,184,166,.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}

.main{flex:1;padding:20px;display:flex;flex-direction:column;gap:16px;overflow-y:auto}
.editors{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.editor-pane{display:flex;flex-direction:column;gap:8px}
.pane-title{font-size:.82rem;font-weight:600}

.code-editor{width:100%;min-height:250px;padding:16px;font-family:var(--mono);font-size:.78rem;line-height:1.6;background:var(--bg-input);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--secondary);resize:vertical;outline:none;tab-size:2}
.code-editor:focus{border-color:var(--primary)}
.code-editor::placeholder{color:var(--text-dim)}

.results{display:flex;flex-direction:column;gap:10px}
.results-head{display:flex;align-items:center;justify-content:space-between}
.migration-output{padding:16px;font-family:var(--mono);font-size:.78rem;line-height:1.7;background:var(--bg-input);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text);overflow-x:auto;white-space:pre-wrap;margin:0}

.warnings{display:flex;flex-direction:column;gap:4px}
.warning-item{padding:8px 12px;font-size:.72rem;border-radius:var(--radius-sm);line-height:1.5}
.warning-item.destructive{background:rgba(239,68,68,.08);border:1px solid rgba(239,68,68,.2);color:var(--error)}
.warning-item.info{background:rgba(20,184,166,.06);border:1px solid rgba(20,184,166,.2);color:var(--primary)}

.changes-summary{display:flex;gap:16px;padding:12px 16px;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-sm);font-size:.75rem}
.change-stat{display:flex;align-items:center;gap:6px}
.change-dot{width:8px;height:8px;border-radius:50%}

.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(--primary);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}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--border);border-radius:3px}
@media(max-width:768px){.editors{grid-template-columns:1fr}.header{flex-wrap:wrap}}