:root{
  --bg:#080b14;
  --bg2:#0d1220;
  --panel:rgba(18,24,40,.72);
  --line:rgba(120,150,200,.16);
  --txt:#e8eefc;
  --dim:#93a3c4;
  --cyan:#22d3ee;
  --violet:#a78bfa;
  --pink:#f472b6;
  --radius:16px;
  --font:"Inter","Segoe UI",system-ui,-apple-system,"Helvetica Neue",Arial,sans-serif;
  --mono:"JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family:var(--font);
  color:var(--txt);
  background:
    radial-gradient(1100px 600px at 12% -10%, rgba(34,211,238,.14), transparent 60%),
    radial-gradient(900px 500px at 95% 0%, rgba(167,139,250,.15), transparent 60%),
    var(--bg);
  display:flex;flex-direction:column;
  min-height:100vh;
  overflow-x:hidden;
}

/* ---------- header ---------- */
.top{
  display:flex;align-items:center;justify-content:space-between;gap:18px;
  padding:14px clamp(14px,3vw,28px);
  border-bottom:1px solid var(--line);
  background:linear-gradient(180deg,rgba(10,14,24,.9),rgba(10,14,24,.55));
  backdrop-filter:blur(10px);
  position:sticky;top:0;z-index:20;
  flex-wrap:wrap;
}
.brand{display:flex;align-items:center;gap:12px;min-width:0}
.logo{
  display:grid;place-items:center;
  width:44px;height:44px;border-radius:13px;
  background:linear-gradient(150deg,rgba(34,211,238,.18),rgba(167,139,250,.18));
  border:1px solid var(--line);
  box-shadow:0 8px 24px rgba(34,211,238,.12);
}
.brand-txt h1{
  margin:0;font-size:20px;letter-spacing:.22em;font-weight:800;line-height:1;
  background:linear-gradient(92deg,var(--cyan),var(--violet) 65%,var(--pink));
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.brand-txt p{margin:3px 0 0;font-size:11.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--dim)}

.nav{display:flex;gap:8px;flex-wrap:wrap}
.nav button{
  font:inherit;font-size:13px;font-weight:600;
  color:var(--dim);
  background:rgba(255,255,255,.03);
  border:1px solid var(--line);
  padding:8px 14px;border-radius:999px;
  cursor:pointer;transition:.18s;
}
.nav button:hover{color:var(--txt);border-color:rgba(34,211,238,.5);transform:translateY(-1px)}
.nav button[aria-current="true"]{
  color:#04121a;
  background:linear-gradient(100deg,var(--cyan),#7dd3fc);
  border-color:transparent;
  box-shadow:0 6px 20px rgba(34,211,238,.28);
}

/* ---------- layout ---------- */
main{
  flex:1;
  display:grid;
  grid-template-columns:minmax(0,1fr) 306px;
  gap:clamp(12px,1.6vw,20px);
  padding:clamp(12px,1.6vw,20px);
  align-items:stretch;
}
.stage{
  position:relative;
  border-radius:var(--radius);
  overflow:hidden;
  border:1px solid var(--line);
  background:#06080f;
  box-shadow:0 24px 60px rgba(0,0,0,.5), inset 0 0 0 1px rgba(255,255,255,.02);
  min-height:min(74vh,760px);
}
#cv{display:block;width:100%;height:100%;cursor:crosshair}
.hud{
  position:absolute;top:10px;left:12px;
  display:flex;align-items:baseline;gap:4px;
  font-family:var(--mono);font-size:11px;color:var(--dim);
  background:rgba(6,9,16,.6);border:1px solid var(--line);
  padding:5px 10px;border-radius:999px;backdrop-filter:blur(6px);
  pointer-events:none;
}
.hud small{font-size:9px;letter-spacing:.1em;text-transform:uppercase;opacity:.75}
#res{margin-left:8px;opacity:.7}
.petunjuk{
  position:absolute;bottom:10px;left:12px;right:12px;
  font-size:12px;color:var(--dim);
  background:rgba(6,9,16,.55);border:1px solid var(--line);
  border-radius:999px;padding:6px 12px;width:max-content;max-width:100%;
  backdrop-filter:blur(6px);pointer-events:none;
  transition:opacity .4s;
}

/* ---------- panel ---------- */
.panel{
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:var(--panel);
  backdrop-filter:blur(12px);
  padding:16px;
  display:flex;flex-direction:column;gap:14px;
  max-height:min(80vh,820px);
  overflow:auto;
}
.panel-head h2{
  margin:0;font-size:16px;letter-spacing:.02em;
}
.desc{margin:6px 0 0;font-size:12.5px;line-height:1.55;color:var(--dim)}
.controls{display:flex;flex-direction:column;gap:13px}
.ctl label{
  display:flex;justify-content:space-between;align-items:baseline;gap:8px;
  font-size:12px;color:var(--dim);margin-bottom:6px;
}
.ctl label b{font-family:var(--mono);font-weight:600;color:var(--cyan);font-size:11.5px}
input[type=range]{
  -webkit-appearance:none;appearance:none;width:100%;height:5px;border-radius:99px;
  background:linear-gradient(90deg,rgba(34,211,238,.65),rgba(167,139,250,.65));
  outline:none;cursor:pointer;
}
input[type=range]::-webkit-slider-thumb{
  -webkit-appearance:none;width:16px;height:16px;border-radius:50%;
  background:#e8eefc;border:2px solid #0b1020;box-shadow:0 0 0 3px rgba(34,211,238,.25);
}
input[type=range]::-moz-range-thumb{
  width:14px;height:14px;border-radius:50%;background:#e8eefc;border:2px solid #0b1020;
}
select{
  width:100%;font:inherit;font-size:12.5px;color:var(--txt);
  background:rgba(255,255,255,.04);border:1px solid var(--line);
  border-radius:10px;padding:8px 10px;cursor:pointer;
}
.switch{display:flex;align-items:center;justify-content:space-between;gap:10px;font-size:12.5px;color:var(--dim)}
.switch input{width:40px;height:22px;-webkit-appearance:none;appearance:none;background:rgba(255,255,255,.1);border-radius:99px;position:relative;cursor:pointer;transition:.2s;border:1px solid var(--line)}
.switch input::after{content:"";position:absolute;top:2px;left:2px;width:16px;height:16px;border-radius:50%;background:var(--dim);transition:.2s}
.switch input:checked{background:rgba(34,211,238,.4)}
.switch input:checked::after{left:20px;background:#eaf7ff}

.actions{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-top:auto}
.actions button{
  font:inherit;font-size:12.5px;font-weight:600;
  color:var(--txt);background:rgba(255,255,255,.04);
  border:1px solid var(--line);border-radius:11px;padding:9px 10px;cursor:pointer;transition:.16s;
}
.actions button:hover{border-color:rgba(167,139,250,.55);background:rgba(167,139,250,.12)}
.actions button:last-child{grid-column:span 2}
.hint{margin:0;font-size:11.5px;line-height:1.6;color:#7d8bab}

/* ---------- footer ---------- */
footer{
  display:flex;gap:10px;justify-content:center;align-items:center;
  padding:16px;font-size:11.5px;color:#6f7d9c;letter-spacing:.06em;
  border-top:1px solid var(--line);
}
footer .dot{opacity:.5}

/* ---------- responsive ---------- */
@media (max-width:900px){
  main{grid-template-columns:1fr}
  .stage{min-height:56vh}
  .panel{max-height:none}
  .brand-txt h1{font-size:17px}
}
@media (max-width:520px){
  .nav button{padding:7px 11px;font-size:12px}
  .hud{font-size:10px}
}