: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: 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}
.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}

.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:disabled{opacity:.4;cursor:not-allowed}
.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:not(:disabled){background:var(--bg-card);color:var(--text);border-color:var(--border-hover)}
.btn-sm{padding:5px 10px;font-size:.72rem}

.main{flex:1;padding:16px 20px;display:flex;flex-direction:column;gap:20px;overflow-y:auto}
.controls{display:flex;flex-wrap:wrap;gap:12px;align-items:flex-end;padding:16px;background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius)}
.form-group{display:flex;flex-direction:column;gap:4px;flex:1;min-width:200px}
.form-group label{font-size:.68rem;font-weight:500;color:var(--text-dim)}
.input{padding:8px 12px;font-size:.78rem;font-family:var(--font);background:var(--bg-input);border:1px solid var(--border);border-radius:6px;color:var(--text);outline:none}
.input:focus{border-color:var(--primary)}
.textarea{resize:vertical;min-height:40px}

.results{display:flex;flex-direction:column;gap:16px}
.section-title{font-size:.85rem;font-weight:600;margin-bottom:8px}
.preview-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.preview-card{padding:16px;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius)}
.preview-label{font-size:.65rem;font-weight:700;padding:2px 8px;border-radius:4px;background:rgba(139,92,246,.15);color:var(--secondary)}
.preview-text{margin-top:10px;font-size:1.1rem;line-height:1.6;color:var(--text)}

.metrics-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:8px}
.metric-card{padding:12px;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-sm);text-align:center}
.metric-value{font-size:1.2rem;font-weight:700;color:var(--secondary)}
.metric-label{font-size:.65rem;color:var(--text-dim);margin-top:2px}

.css-section{padding:16px;background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius)}
.code-output{padding:14px;font-family:var(--mono);font-size:.75rem;line-height:1.6;background:var(--bg-input);border-radius:var(--radius-sm);color:var(--accent);overflow-x:auto;white-space:pre-wrap}

.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}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--border);border-radius:3px}
@media(max-width:768px){.preview-grid{grid-template-columns:1fr}.metrics-grid{grid-template-columns:repeat(2,1fr)}}