*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
:root{
  --primary:#00CEC9;--primary-light:#81ECEC;--accent:#6C5CE7;
  --bg:#0B0E11;--bg-card:rgba(20,24,32,0.85);
  --bg-input:rgba(15,18,25,0.8);--text:#E8E6F0;--text-dim:#8B8AA0;
  --text-muted:#5A5872;--border:rgba(0,206,201,0.15);
  --radius:12px;--radius-sm:8px;
  --font:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',system-ui,sans-serif;
  --mono:'JetBrains Mono','SFMono-Regular','Consolas',monospace;
  --transition:250ms ease;--glass-bg:rgba(20,24,32,0.6);--glass-border:rgba(255,255,255,0.06)
}
html{font-size:16px}
body{font-family:var(--font);background:var(--bg);color:var(--text);min-height:100vh;-webkit-font-smoothing:antialiased}
body::before{content:'';position:fixed;inset:0;background:radial-gradient(ellipse at 20% 15%,rgba(0,206,201,0.06) 0%,transparent 50%),radial-gradient(ellipse at 80% 80%,rgba(108,92,231,0.04) 0%,transparent 50%);pointer-events:none;z-index:0}
.app{position:relative;z-index:1}
.header{padding:1rem 2rem;border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:.75rem}
.header-brand{display:flex;align-items:center;gap:.75rem}
.header-brand h1{font-size:1.05rem;font-weight:700;background:linear-gradient(135deg,var(--primary),var(--accent));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.subtitle{font-size:.78rem;color:var(--text-dim)}
.main{padding:1.5rem 2rem}
.layout{display:grid;grid-template-columns:260px 1fr;gap:1.5rem;align-items:start}
.glass-card{background:var(--glass-bg);backdrop-filter:blur(12px);border:1px solid var(--glass-border);border-radius:var(--radius);padding:1.25rem;margin-bottom:1.25rem}
.section-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:.75rem}
.section-title{font-size:.85rem;font-weight:700;color:var(--primary-light);margin-bottom:.75rem}
.section-header .section-title{margin-bottom:0}
.controls{position:sticky;top:1rem}
.ctrl{margin-bottom:.75rem}
.ctrl-label{display:block;font-size:.72rem;font-weight:600;color:var(--text-dim);margin-bottom:.25rem;text-transform:uppercase;letter-spacing:.04em}
.select{width:100%;padding:.4rem .5rem;background:var(--bg-input);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text);font-size:.82rem;font-family:var(--font)}
.range-row{display:flex;align-items:center;gap:.5rem}
.range{flex:1;accent-color:var(--primary)}
.range-val{font-family:var(--mono);font-size:.78rem;color:var(--text-dim);min-width:2rem;text-align:right}
.breakpoints{display:flex;gap:.25rem}
.bp-btn{flex:1;padding:.35rem .3rem;background:rgba(255,255,255,0.03);border:1px solid var(--glass-border);border-radius:var(--radius-sm);color:var(--text-dim);font-size:.72rem;font-weight:600;cursor:pointer;transition:all var(--transition);font-family:var(--font)}
.bp-btn:hover{border-color:var(--border);color:var(--text)}
.bp-btn.active{background:rgba(0,206,201,0.15);border-color:var(--primary);color:var(--primary-light)}
.preview-wrapper{border:2px dashed var(--border);border-radius:var(--radius-sm);overflow:hidden;margin:0 auto;transition:width .3s ease;max-width:100%}
.snap-container{display:flex;overflow:auto;gap:16px;padding:16px;height:250px;scroll-behavior:smooth}
.snap-container.vertical{flex-direction:column;height:350px}
.snap-item{min-width:200px;min-height:150px;border-radius:var(--radius-sm);display:flex;align-items:center;justify-content:center;font-size:.85rem;font-weight:700;color:rgba(255,255,255,0.9);flex-shrink:0;transition:transform 150ms ease}
.snap-item:nth-child(6n+1){background:linear-gradient(135deg,rgba(0,206,201,0.3),rgba(0,206,201,0.1))}
.snap-item:nth-child(6n+2){background:linear-gradient(135deg,rgba(108,92,231,0.3),rgba(108,92,231,0.1))}
.snap-item:nth-child(6n+3){background:linear-gradient(135deg,rgba(225,112,85,0.3),rgba(225,112,85,0.1))}
.snap-item:nth-child(6n+4){background:linear-gradient(135deg,rgba(0,184,148,0.3),rgba(0,184,148,0.1))}
.snap-item:nth-child(6n+5){background:linear-gradient(135deg,rgba(253,203,110,0.3),rgba(253,203,110,0.1))}
.snap-item:nth-child(6n+6){background:linear-gradient(135deg,rgba(162,155,254,0.3),rgba(162,155,254,0.1))}
.code-output{background:var(--bg-input);border:1px solid var(--border);border-radius:var(--radius-sm);padding:.75rem;font-family:var(--mono);font-size:.78rem;overflow-x:auto;white-space:pre;color:var(--text-dim);line-height:1.55;max-height:200px;overflow-y:auto}
.btn{display:inline-flex;align-items:center;gap:.25rem;padding:.4rem .75rem;border:none;border-radius:var(--radius-sm);font-size:.78rem;font-weight:600;font-family:var(--font);cursor:pointer;transition:all var(--transition)}
.btn-accent{background:rgba(108,92,231,0.15);color:var(--accent);border:1px solid rgba(108,92,231,0.2)}
.btn-accent:hover{background:rgba(108,92,231,0.25)}
.btn-sm{font-size:.75rem;padding:.3rem .5rem}
.footer{padding:1rem 2rem;text-align:center;font-size:.78rem;color:var(--text-muted);border-top:1px solid var(--border)}
.toast-container{position:fixed;bottom:1.5rem;right:1.5rem;z-index:200;display:flex;flex-direction:column;gap:.5rem}
.toast{background:var(--bg-card);border:1px solid var(--border);border-left:3px solid var(--primary);backdrop-filter:blur(20px);border-radius:var(--radius-sm);padding:.75rem 1rem;font-size:.82rem;color:var(--text);box-shadow:0 8px 40px rgba(0,0,0,0.4);animation:slideIn 300ms ease;max-width:320px}
::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:rgba(0,206,201,0.25);border-radius:3px}
@keyframes slideIn{from{opacity:0;transform:translateX(20px)}to{opacity:1;transform:translateX(0)}}
@media(max-width:768px){.layout{grid-template-columns:1fr}.main{padding:1rem}}