/* Basic Reset & Fonts */
*{box-sizing:border-box;margin:0;padding:0;font-family:Poppins,system-ui,Segoe UI,Roboto,"Helvetica Neue",Arial}
:root{
  --bg1:#020406; --glass:rgba(255,255,255,0.04); --neon:#00ffc8; --accent:#00b7ff; --danger:#ff7070;
  --card-shadow: 0 8px 30px rgba(0,255,200,0.06);
}
body.theme-dark{background:radial-gradient(circle at 10% 10%, #07101a 0%, #000000 60%); color:#eafef8}
body.theme-light{background:#f6f7fb; color:#041017}
.loader{position:fixed;inset:0;display:flex;align-items:center;justify-content:center;background:linear-gradient(180deg,rgba(0,0,0,0.6),transparent);z-index:9999}
.loader-inner{display:flex;flex-direction:column;align-items:center;gap:10px}
.neon-ball{width:56px;height:56px;border-radius:50%;box-shadow:0 0 22px var(--neon),0 0 8px rgba(0,255,200,0.25);background:linear-gradient(45deg,#00ffc8,#00b7ff)}
.loader p{color:var(--neon);letter-spacing:3px;font-weight:600}

.app{max-width:1000px;margin:36px auto;padding:16px;opacity:0;transition:opacity .35s}
.topbar{display:flex;justify-content:space-between;align-items:center;padding:6px 12px}
.topbar h1{color:var(--neon);text-shadow:0 0 10px rgba(0,255,200,0.08)}
.controls button{background:transparent;border:none;font-size:18px;margin-left:8px;cursor:pointer;color:inherit}

.container{display:grid;grid-template-columns:1fr 320px;gap:18px;align-items:start}
.calculator{background:var(--glass);border-radius:18px;padding:14px;backdrop-filter: blur(8px);box-shadow:var(--card-shadow);border:1px solid rgba(255,255,255,0.03)}
.display{display:flex;flex-direction:column;gap:8px}
.screen{min-height:74px;padding:12px;border-radius:12px;background:rgba(255,255,255,0.02);font-size:28px;color:#fff;display:flex;align-items:center;justify-content:flex-end;overflow:auto}
.history-mini{font-size:12px;opacity:0.7;color:#cfeee7;max-width:100%;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}

.modes{display:flex;gap:10px;margin:8px 0;font-size:13px;color:rgba(255,255,255,0.8)}
.buttons{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-top:8px}
.btn{padding:14px;border-radius:12px;border:none;cursor:pointer;background:rgba(255,255,255,0.03);color:#fff;font-size:18px;transition:all .15s}
.btn:hover{transform:translateY(-3px);box-shadow:0 6px 20px rgba(0,0,0,0.25)}
.func{color:var(--danger)}
.op{color:var(--accent)}
.equals{background:linear-gradient(90deg,var(--neon),var(--accent));color:#001; font-weight:700}
.zero{grid-column:span 2}

/* Scientific panel */
.scientific{margin-top:12px;display:grid;grid-template-columns:repeat(8,auto);gap:8px}
.sci{padding:8px 10px;font-size:14px;}

/* Sidebar */
.sidebar{padding:8px}
.history{background:rgba(255,255,255,0.03);padding:10px;border-radius:10px;margin-bottom:12px}
.history h3{margin-bottom:8px;color:var(--neon)}
.history ul{list-style:none;max-height:220px;overflow:auto;padding-right:6px}
.history li{padding:6px;border-bottom:1px dashed rgba(255,255,255,0.03);font-size:14px}
.small{background:transparent;border:1px solid rgba(255,255,255,0.05);padding:6px;border-radius:8px;margin-top:8px;cursor:pointer}

/* AI helper */
.aiHelper{background:rgba(255,255,255,0.02);padding:10px;border-radius:10px}
.aiHelper input{width:100%;padding:8px;border-radius:8px;border:1px solid rgba(255,255,255,0.03);margin-bottom:6px}
.aiControls{display:flex;gap:6px}
.aiOutput{min-height:60px;padding:8px;border-radius:8px;background:rgba(0,0,0,0.12);margin-top:8px}

/* Footer */
.footer{display:flex;justify-content:space-between;align-items:center;margin-top:12px;color:rgba(255,255,255,0.6);font-size:13px}

/* Responsive */
@media (max-width:880px){
  .container{grid-template-columns:1fr;gap:12px}
  .sidebar{order:2}
  .calculator{order:1}
}

/* Light theme overrides */
body.theme-light .calculator, body.theme-light .sidebar{background:rgba(0,0,0,0.03); color:#041017}
body.theme-light .screen{background:#fff;color:#041017}