:root{
  --bg:#0f1724;
  --card: rgba(255,255,255,0.06);
  --glass: rgba(255,255,255,0.04);
  --accent: linear-gradient(90deg,#6ee7b7,#60a5fa);
  --text:#e6eef8;
  --muted:#9fb3c8;
  --radius:14px;
  --glass-border: rgba(255,255,255,0.06);
}

:root.light {
  --bg: #f5f8fb;
  --card: rgba(255,255,255,0.9);
  --glass: rgba(255,255,255,0.95);
  --text: #0b1220;
  --muted: #4b5563;
  --glass-border: rgba(0,0,0,0.06);
}

*{box-sizing:border-box}
html,body{height:100%;margin:0;font-family:Inter, "Segoe UI", Roboto, Arial, sans-serif;color:var(--text);background:radial-gradient(1200px 500px at 10% 10%, rgba(96,165,250,0.08), transparent), radial-gradient(900px 400px at 90% 90%, rgba(110,231,183,0.06), transparent), var(--bg);}

.page{min-height:100vh;display:flex;flex-direction:column}

.topbar{
  display:flex;align-items:center;justify-content:space-between;padding:18px 24px;
  gap:16px;
}
.brand{display:flex;gap:12px;align-items:center}
.logo{width:44px;height:44px;fill:var(--accent);filter:drop-shadow(0 4px 18px rgba(0,0,0,0.3));}
.brand h1{font-size:18px;margin:0;line-height:1}
.brand .muted{font-weight:400;font-size:13px;color:var(--muted)}

.container{max-width:1100px;margin:12px auto;padding:18px;display:grid;grid-template-columns:1fr 420px;gap:18px;width:calc(100% - 40px)}
@media (max-width:980px){.container{grid-template-columns:1fr;}}
.panel{background:linear-gradient(180deg, rgba(255,255,255,0.02), transparent);border-radius:var(--radius);padding:16px;border:1px solid var(--glass-border);box-shadow:0 6px 30px rgba(2,6,23,0.45)}

.io-panel h2, .result-panel h2{margin:0 0 12px 0}
.complex-row{display:flex;gap:12px}
@media (max-width:720px){.complex-row{flex-direction:column}}
.complex-card{flex:1;padding:12px;border-radius:10px;background:var(--card);border:1px solid var(--glass-border)}
.complex-card h3{margin:0 0 10px 0;font-size:15px}
label{display:block;font-size:13px;color:var(--muted);margin-bottom:8px}
input[type="number"]{width:100%;padding:10px;border-radius:8px;border:1px solid rgba(255,255,255,0.06);background:transparent;color:var(--text);font-size:15px;outline:none;transition:transform .15s ease}
input[type="number"]::placeholder{color:rgba(255,255,255,0.18)}
input[type="number"]:focus{box-shadow:0 6px 18px rgba(96,165,250,0.08);transform:translateY(-2px)}

.ops-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:12px}
@media (max-width:480px){.ops-grid{grid-template-columns:repeat(2,1fr)}}
.btn{padding:10px 12px;border-radius:10px;border:none;cursor:pointer;font-weight:600;background:linear-gradient(180deg,rgba(255,255,255,0.03), rgba(255,255,255,0.01));color:var(--text);transition:transform .12s ease, box-shadow .12s ease}
.btn:hover{transform:translateY(-4px);box-shadow:0 10px 30px rgba(0,0,0,0.3)}
.btn.op{position:relative;overflow:hidden}
.btn.op::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,transparent,rgba(255,255,255,0.02));opacity:0;transition:opacity .2s}
.btn.op:hover::after{opacity:1}

.result-card{padding:16px;border-radius:12px;background:linear-gradient(180deg, rgba(255,255,255,0.02), transparent);min-height:120px;display:flex;flex-direction:column;justify-content:space-between;border:1px solid var(--glass-border)}
.result-text{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;background:rgba(0,0,0,0.05);padding:10px;border-radius:8px;color:var(--text)}
.result-text small{display:block;color:var(--muted);font-weight:500}
.result-actions{display:flex;gap:8px;align-items:center;margin-top:10px}
.mini{padding:8px 10px;border-radius:10px;border:none;background:transparent;color:var(--muted);cursor:pointer}
.mini:hover{color:var(--text);text-decoration:underline}

.history{margin-top:12px;border-top:1px dashed var(--glass-border);padding-top:10px}
.history-list{list-style:none;padding:0;margin:8px 0 0 0;max-height:180px;overflow:auto}
.history-list li{padding:8px;border-radius:8px;margin-bottom:8px;background:rgba(0,0,0,0.03);cursor:pointer;font-size:14px}
.history-list li:hover{background:rgba(255,255,255,0.02);transform:translateX(4px)}

.footer{padding:12px;text-align:center;color:var(--muted);margin-top:auto;font-size:13px}

.icon-btn{border:none;background:transparent;color:var(--text);cursor:pointer;padding:8px;border-radius:9px;font-size:16px}
.icon-btn:hover{background:var(--glass);transform:translateY(-2px)}