:root{--amrita:#b50246; --amrita-dark:#7d0130; --amrita-light:#e8a5c0;
    --ink:#1d2330; --muted:#5b6472; --line:#e5e8ee; --bg:#f4f6fb; --card:#ffffff;
    --accent:#0e7c86; --accent2:#e0662c; --good:#1f9d55; --bad:#d64545;
    --radius:14px; --shadow:0 8px 30px rgba(20,25,40,.08); --shadow-sm:0 2px 10px rgba(20,25,40,.06);}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:"Segoe UI",Roboto,-apple-system,Helvetica,Arial,sans-serif;
       background:var(--bg);color:var(--ink);line-height:1.6;-webkit-text-size-adjust:100%}
a{color:var(--amrita)}
h1,h2,h3{line-height:1.25;color:var(--ink)}
main{max-width:1180px;margin:0 auto;padding:22px 18px 60px}
@keyframes fade{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);
        padding:22px 24px;margin-bottom:20px}
.card h2{margin-top:0;font-size:1.4rem;display:flex;align-items:center;gap:10px}
.sim{display:grid;grid-template-columns:320px 1fr;gap:20px;align-items:start}
@media(max-width:820px){.sim{grid-template-columns:1fr}}
.controls .field{margin-bottom:14px}
.controls label{display:flex;justify-content:space-between;font-weight:600;font-size:.9rem;margin-bottom:5px}
.controls label .val{color:var(--amrita);font-variant-numeric:tabular-nums}
.controls input[type=range]{width:100%;accent-color:var(--amrita)}
.controls input[type=number]{width:100%;padding:9px 11px;border:1px solid var(--line);border-radius:9px;font:inherit;background:#fbfcfe}
.controls input[type=number]:focus{outline:none;border-color:var(--amrita);box-shadow:0 0 0 3px #b5024622}
.hint{font-size:.76rem;color:var(--muted);margin-top:3px}
.btnrow{display:flex;flex-wrap:wrap;gap:10px;margin-top:8px}
.btn{border:0;font:inherit;font-weight:700;cursor:pointer;padding:11px 16px;border-radius:10px;transition:.15s;
       display:inline-flex;align-items:center;gap:7px}
.btn:active{transform:translateY(1px)}
.btn-primary{background:var(--amrita);color:#fff}
.btn-primary:hover{background:var(--amrita-dark)}
.btn-ghost{background:#fff;color:var(--ink);border:1px solid var(--line)}
.btn-ghost:hover{border-color:var(--amrita);color:var(--amrita)}
.btn-accent{background:var(--accent);color:#fff}
.btn-accent:hover{filter:brightness(.92)}
.plotwrap{background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow-sm);padding:14px}
.plot-head{display:flex;justify-content:space-between;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:8px}
.plot-title{font-weight:700}
canvas.chart{width:100%;height:auto;display:block;touch-action:none}
.readout{display:flex;gap:16px;flex-wrap:wrap;font-size:.85rem;color:var(--muted);margin-top:8px}
.readout b{color:var(--ink)}
.legend{display:flex;gap:16px;flex-wrap:wrap;font-size:.85rem;margin-top:6px}
.legend span{display:inline-flex;align-items:center;gap:6px}
.legend i{width:14px;height:14px;border-radius:3px;display:inline-block}
.toast{position:fixed;left:50%;bottom:28px;transform:translateX(-50%) translateY(20px);background:#12203a;color:#fff;
     padding:12px 20px;border-radius:10px;box-shadow:var(--shadow);opacity:0;pointer-events:none;transition:.3s;z-index:200}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}
html,body{overflow-x:hidden;max-width:100vw}
body{background:var(--bg);padding:16px}
.card,.plotwrap,.sim,.controls{min-width:0}
.sim>*{min-width:0}
.plot-title,.simbar-title,.plot-head{overflow-wrap:anywhere}
canvas{max-width:100%}
.simbar{display:flex;align-items:center;gap:14px;padding:2px 6px 14px;border-bottom:1px solid var(--line);margin:-4px 0 18px}
.simbar-logo img{height:40px;width:auto;display:block}
.simbar-title{flex:1;min-width:0;text-align:center;margin:0;font-size:1.25rem;font-weight:800;color:var(--ink);line-height:1.2}
.fs-btn{display:none;flex:0 0 auto;border:1px solid var(--line);background:#fff;color:var(--muted);cursor:pointer;font-size:1.15rem;line-height:1;padding:9px 12px;border-radius:10px;transition:.15s}
.fs-btn:hover{border-color:var(--amrita);color:var(--amrita)}
@media(min-width:1024px){.fs-btn{display:inline-flex}}
#simbox{max-width:1320px;margin:0 auto}
#simbox:fullscreen{max-width:none;width:100vw;height:100vh;overflow:auto;border-radius:0;padding:22px 28px;background:#fff}
#simbox:-webkit-full-screen{max-width:none;width:100vw;height:100vh;overflow:auto;border-radius:0;padding:22px 28px;background:#fff}
@media(max-width:640px){body{padding:10px}
.card{padding:16px 15px}}
@media(max-width:430px){.simbar-title{font-size:1rem}
.simbar-logo img{height:30px}
.simbar{gap:9px}}
@media(max-width:340px){.simbar-title{font-size:.9rem}}
.dl-label{font-weight:700;font-size:.78rem;color:var(--muted);text-transform:uppercase;letter-spacing:.05em;margin:12px 0 2px}