/* ==========================================================================
   Bluefrog.ai Lab — shared design system
   One stylesheet for every experiment in /lab/.
   ========================================================================== */

:root{
  --bg:#070a12;
  --panel:rgba(18,25,43,.82);
  --panel-solid:#121a2b;
  --line:rgba(120,160,255,.16);
  --line-hot:rgba(120,170,255,.42);
  --txt:#dce6ff;
  --dim:#8595bb;
  --dimmer:#5f6d90;
  --c1:#57e6ff;   /* cyan   */
  --c2:#ff5db1;   /* magenta*/
  --c3:#ffd166;   /* amber  */
  --c4:#a98bff;   /* violet */
  --ok:#5ef2a4;
  --bad:#ff6b6b;
  --mono:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;min-height:100%;
  background:
    radial-gradient(900px 600px at 12% 110%, rgba(255,93,177,.09) 0, transparent 60%),
    radial-gradient(1100px 700px at 82% -5%, rgba(87,230,255,.11) 0, transparent 60%),
    var(--bg);
  background-attachment:fixed;
  color:var(--txt);
  font:15px/1.55 ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  overflow-x:hidden;
}
a{color:var(--c1);text-decoration:none}
a:hover{text-decoration:underline}

.wrap{max-width:1240px;margin:0 auto;padding:18px 18px 64px}
.wrap.narrow{max-width:900px}

/* ------------------------------------------------------------------ navbar */
.nav{
  display:flex;align-items:center;gap:12px;flex-wrap:wrap;
  padding:10px 0 16px;margin-bottom:14px;border-bottom:1px solid var(--line);
}
.nav .brand{display:flex;align-items:center;gap:9px;font-weight:650;letter-spacing:-.01em;color:var(--txt)}
.nav .brand:hover{text-decoration:none}
.nav .brand img{width:26px;height:26px;border-radius:7px;display:block}
.nav .brand b{background:linear-gradient(92deg,var(--c1),var(--c4));-webkit-background-clip:text;background-clip:text;color:transparent}
.nav .sep{flex:1}
.nav a.nlink{color:var(--dim);font-size:13.5px}
.nav a.nlink:hover{color:var(--txt);text-decoration:none}
.nav a.nlink.cta{
  color:#eafcff;border:1px solid rgba(94,242,164,.45);border-radius:999px;padding:5px 13px;
  background:linear-gradient(180deg,rgba(94,242,164,.2),rgba(94,242,164,.06));
}

/* ------------------------------------------------------------------ titles */
h1.title{
  font-size:clamp(23px,3.4vw,36px);margin:0;letter-spacing:-.025em;line-height:1.15;
  background:linear-gradient(92deg,var(--c1),var(--c4) 48%,var(--c2));
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.pagehead{display:flex;flex-wrap:wrap;align-items:baseline;gap:8px 16px;margin-bottom:16px}
.pagehead .tag{color:var(--dim);font-size:13.5px;max-width:70ch}

/* ------------------------------------------------------------- layout bits */
.lab{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:16px;align-items:start}
@media (max-width:940px){ .lab{grid-template-columns:1fr} }

.stage{
  position:relative;border:1px solid var(--line);border-radius:16px;overflow:hidden;
  background:linear-gradient(180deg,#0a1020,#070b14);
  box-shadow:0 24px 60px rgba(0,0,0,.55), inset 0 1px 0 rgba(255,255,255,.04);
}
.stage canvas{display:block;width:100%;height:auto;touch-action:none}
.bar{display:flex;flex-wrap:wrap;gap:8px;padding:12px;border-top:1px solid var(--line);background:rgba(9,13,24,.6)}
.bar .spacer{flex:1}

.panel{
  border:1px solid var(--line);border-radius:16px;background:var(--panel);
  padding:14px 15px 16px;backdrop-filter:blur(10px);
  box-shadow:0 20px 50px rgba(0,0,0,.4);
}
.panel + .panel{margin-top:14px}
.panel h2{font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--dim);margin:0 0 12px}

.hud{
  position:absolute;left:12px;top:12px;display:flex;flex-direction:column;gap:4px;
  font:12px/1.35 var(--mono);color:var(--dim);pointer-events:none;text-shadow:0 1px 8px #000;
}
.hud b{color:var(--txt);font-weight:600}
.hint{
  position:absolute;right:12px;top:12px;font-size:12px;color:var(--dim);
  background:rgba(8,12,22,.6);border:1px solid var(--line);border-radius:999px;
  padding:5px 11px;pointer-events:none;backdrop-filter:blur(6px);transition:opacity .5s ease;
}
.hint.gone{opacity:0}

/* ----------------------------------------------------------------- buttons */
button,.btn{
  font:inherit;font-size:13.5px;color:var(--txt);cursor:pointer;
  background:rgba(255,255,255,.05);border:1px solid var(--line);
  border-radius:10px;padding:8px 13px;transition:.16s ease;
}
button:hover,.btn:hover{background:rgba(120,170,255,.14);border-color:var(--line-hot);transform:translateY(-1px);text-decoration:none}
button:active{transform:translateY(0)}
button:disabled{opacity:.4;cursor:not-allowed;transform:none}
button.on{background:linear-gradient(180deg,rgba(87,230,255,.24),rgba(87,230,255,.1));border-color:rgba(87,230,255,.55);color:#eafcff}
button.primary{background:linear-gradient(180deg,rgba(94,242,164,.22),rgba(94,242,164,.08));border-color:rgba(94,242,164,.5)}
button.danger{background:linear-gradient(180deg,rgba(255,107,107,.2),rgba(255,107,107,.06));border-color:rgba(255,107,107,.45)}

/* ----------------------------------------------------------------- sliders */
.ctl{margin-bottom:13px}
.ctl:last-child{margin-bottom:0}
.ctl label{display:flex;justify-content:space-between;align-items:baseline;font-size:13px;color:var(--dim);margin-bottom:5px}
.ctl label span{color:var(--txt);font:12.5px/1 var(--mono)}
input[type=range]{-webkit-appearance:none;appearance:none;width:100%;height:22px;background:transparent;cursor:pointer;margin:0}
input[type=range]::-webkit-slider-runnable-track{height:4px;border-radius:99px;background:rgba(255,255,255,.13)}
input[type=range]::-moz-range-track{height:4px;border-radius:99px;background:rgba(255,255,255,.13)}
input[type=range]::-webkit-slider-thumb{
  -webkit-appearance:none;width:15px;height:15px;border-radius:50%;margin-top:-5.5px;border:0;
  background:var(--c1);box-shadow:0 0 0 4px rgba(87,230,255,.16),0 0 12px rgba(87,230,255,.55);
}
input[type=range]::-moz-range-thumb{
  width:15px;height:15px;border:0;border-radius:50%;
  background:var(--c1);box-shadow:0 0 0 4px rgba(87,230,255,.16),0 0 12px rgba(87,230,255,.55);
}
.ctl.alt input[type=range]::-webkit-slider-thumb{background:var(--c2);box-shadow:0 0 0 4px rgba(255,93,177,.16),0 0 12px rgba(255,93,177,.5)}
.ctl.alt input[type=range]::-moz-range-thumb{background:var(--c2);box-shadow:0 0 0 4px rgba(255,93,177,.16),0 0 12px rgba(255,93,177,.5)}

/* ------------------------------------------------------------------ inputs */
input[type=text],input[type=email],input[type=number],select{
  font:inherit;width:100%;color:var(--txt);background:rgba(6,10,18,.8);
  border:1px solid var(--line);border-radius:10px;padding:10px 12px;
}
input:focus,select:focus{outline:none;border-color:var(--line-hot);box-shadow:0 0 0 3px rgba(87,230,255,.12)}
input::placeholder{color:var(--dimmer)}

/* ----------------------------------------------------------------- readout */
.readout{display:grid;grid-template-columns:auto 1fr;gap:4px 12px;font:12px/1.55 var(--mono);margin:0}
.readout dt{color:var(--dim)}
.readout dd{margin:0;text-align:right}

/* ------------------------------------------------------------------- cards */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(255px,1fr));gap:14px}
.card{
  display:block;position:relative;overflow:hidden;color:var(--txt);
  border:1px solid var(--line);border-radius:16px;background:var(--panel);
  padding:16px 16px 15px;transition:.2s ease;
}
.card:hover{transform:translateY(-3px);border-color:var(--line-hot);text-decoration:none;box-shadow:0 18px 40px rgba(0,0,0,.5)}
.card .ico{font-size:24px;line-height:1;margin-bottom:9px;display:block}
.card h3{margin:0 0 5px;font-size:16.5px;letter-spacing:-.01em}
.card p{margin:0;color:var(--dim);font-size:13px;line-height:1.5}
.card .kind{
  position:absolute;top:14px;right:14px;font:10.5px/1 var(--mono);letter-spacing:.1em;
  text-transform:uppercase;color:var(--dimmer);border:1px solid var(--line);
  border-radius:999px;padding:4px 8px;
}
.card.physics:hover{box-shadow:0 18px 40px rgba(87,230,255,.12)}
.card.magic:hover{box-shadow:0 18px 40px rgba(255,93,177,.12)}
.card.math:hover{box-shadow:0 18px 40px rgba(169,139,255,.12)}

/* ----------------------------------------------------------------- explain */
.explain{margin-top:22px;border:1px solid var(--line);border-radius:16px;background:rgba(13,19,34,.6);padding:18px 20px}
.explain h2{margin:0 0 10px;font-size:17px;color:var(--txt)}
.explain h3{margin:18px 0 8px;font-size:14.5px;color:var(--c1)}
.explain p,.explain li{color:#b9c6e6;max-width:78ch}
.explain p{margin:0 0 11px}
.explain ul{margin:0 0 11px;padding-left:20px}
.explain .eq{
  font:13px/1.9 var(--mono);color:var(--c1);background:#060a12;border:1px solid var(--line);
  border-radius:10px;padding:12px 14px;overflow-x:auto;white-space:pre;
}
.kbd{font:12px var(--mono);background:rgba(255,255,255,.07);border:1px solid var(--line);border-radius:6px;padding:1.5px 6px}
.note{font-size:12.5px;color:var(--dim);margin:10px 0 0}

/* ------------------------------------------------------------------ footer */
footer.lab-footer{
  margin-top:34px;padding-top:18px;border-top:1px solid var(--line);
  color:var(--dim);font-size:12.5px;display:flex;flex-wrap:wrap;gap:8px 16px;align-items:center;
}
footer.lab-footer .sep{flex:1}

/* ------------------------------------------------------------------ misc */
.big{font:600 clamp(30px,7vw,54px)/1.05 var(--mono);letter-spacing:-.02em}
.mono{font-family:var(--mono)}
.ok{color:var(--ok)} .bad{color:var(--bad)} .amber{color:var(--c3)}
.pill{display:inline-block;font:11px/1 var(--mono);letter-spacing:.08em;text-transform:uppercase;
  color:var(--dim);border:1px solid var(--line);border-radius:999px;padding:5px 9px}
.center{text-align:center}
.hidden{display:none !important}

@media (prefers-reduced-motion:reduce){
  *{animation-duration:.01ms !important;transition-duration:.01ms !important}
}