:root{
  --ground:#0c1114; --panel:#141c20; --panel2:#1b262b; --line:#2a353b; --line2:#37454c;
  --ink:#e3eaeb; --muted:#93a2a8; --amber:#f0b357; --amber-dim:#b98a40; --good:#54d79a; --bad:#ef6f6b;
  --mono:ui-monospace,"SF Mono","JetBrains Mono",Menlo,Consolas,monospace;
  --sans:system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
}
*{box-sizing:border-box}
html,body{height:100%}
html{scroll-behavior:smooth}
body{margin:0;background:var(--ground);color:var(--ink);font-family:var(--sans);
  background-image:radial-gradient(1100px 460px at 82% -10%, rgba(240,179,87,.06), transparent 60%);}
.app-shell{max-width:1400px;margin:0 auto;padding:18px 18px 26px;min-height:100%;display:flex;flex-direction:column;gap:14px}
code{font-family:var(--mono)}

/* landing intro (this page is the project's front door; the Lab sits below) */
.intro{border:1px solid var(--line);border-radius:12px;padding:22px 22px 20px;
  background:linear-gradient(180deg,var(--panel2),var(--panel));position:relative;overflow:hidden}
.intro::before{content:"";position:absolute;inset:0;pointer-events:none;
  background:radial-gradient(680px 220px at 92% -30%, rgba(240,179,87,.10), transparent 62%)}
.intro-head{display:flex;justify-content:space-between;align-items:flex-start;gap:20px;flex-wrap:wrap}
.intro-eyebrow{font-family:var(--mono);font-size:11px;letter-spacing:.2em;text-transform:uppercase;color:var(--amber-dim)}
.intro-title{margin:6px 0 0;font-size:34px;letter-spacing:-.02em;line-height:1;text-wrap:balance}
.intro-lede{margin:11px 0 0;max-width:66ch;color:var(--muted);font-size:14px;line-height:1.55}
.intro-here{font-family:var(--mono);font-size:11px;color:var(--muted);border:1px solid var(--line2);
  border-radius:999px;padding:6px 12px;white-space:nowrap}
.intro-here strong{color:var(--good);font-weight:600}
.intro-links{margin-top:18px;display:grid;gap:11px;grid-template-columns:repeat(auto-fit,minmax(190px,1fr))}
.tile{display:flex;flex-direction:column;gap:5px;padding:13px 15px;border:1px solid var(--line2);border-radius:10px;
  background:rgba(12,17,20,.5);text-decoration:none;color:var(--ink);transition:border-color .15s,transform .15s,background .15s}
.tile:hover{border-color:var(--amber);transform:translateY(-2px);background:rgba(240,179,87,.06)}
.tile:focus-visible{outline:2px solid var(--amber);outline-offset:2px}
.tile .t-name{font-weight:600;font-size:14px;letter-spacing:-.01em}
.tile .t-desc{font-size:12px;color:var(--muted);line-height:1.45}
.intro-start{margin:16px 0 0;font-size:12.5px;color:var(--muted)}
.intro-start code{color:var(--amber);background:rgba(240,179,87,.08);padding:1px 5px;border-radius:4px}
@media (max-width:560px){.intro-title{font-size:27px}.intro-here{align-self:flex-start}}

.compatibility-banner{border:1px solid var(--bad);background:rgba(239,111,107,.08);border-radius:10px;padding:14px 18px}
.compatibility-banner h2{margin:0 0 6px;font-size:16px;color:var(--bad)}
.compatibility-banner p{margin:0;color:var(--muted);font-size:14px}

.tool-card{background:var(--panel);border:1px solid var(--line);border-radius:12px;display:flex;flex-direction:column;overflow:hidden;flex:1;min-height:520px}
.toolbar{display:flex;flex-wrap:wrap;gap:14px;align-items:center;justify-content:space-between;padding:16px 18px;border-bottom:1px solid var(--line);background:linear-gradient(180deg,var(--panel2),var(--panel))}
.brand h1{margin:0;font-size:19px;letter-spacing:-.01em}
.brand h1 span{color:var(--amber);font-weight:600}
.brand .sub{margin:3px 0 0;color:var(--muted);font-size:12.5px;max-width:62ch}
.toolbar-actions{display:flex;flex-wrap:wrap;gap:10px;align-items:center}

button{font-family:var(--sans);font-size:13px;font-weight:600;color:var(--ink);background:var(--panel2);
  border:1px solid var(--line2);border-radius:7px;padding:8px 14px;cursor:pointer}
button:hover:not(:disabled){border-color:var(--amber-dim)}
button:disabled{opacity:.45;cursor:not-allowed}
button.primary{background:var(--amber);color:#241a05;border-color:var(--amber)}
button.run-button{background:var(--good);color:#06251a;border-color:var(--good)}
.demo-select{font-family:var(--sans);font-size:13px;color:var(--ink);background:var(--panel2);border:1px solid var(--line2);border-radius:7px;padding:8px 10px}
.auth-toggle{display:flex;align-items:center;gap:7px;font-size:12.5px;color:var(--amber);font-family:var(--mono);border:1px solid var(--amber-dim);border-radius:7px;padding:6px 10px;background:rgba(240,179,87,.06);cursor:pointer}
.raw-toggle{display:flex;align-items:center;gap:6px;font-size:12.5px;color:var(--muted)}

.workspace{display:grid;grid-template-columns:1fr 1fr;gap:0;flex:1;min-height:0}
@media(max-width:900px){.workspace{grid-template-columns:1fr}}
.editor-panel{border-right:1px solid var(--line);display:flex;flex-direction:column;min-height:0}
.output-panel{display:flex;flex-direction:column;min-height:0}
.panel-header{display:flex;align-items:center;justify-content:space-between;padding:10px 16px;border-bottom:1px solid var(--line)}
.panel-header h2{margin:0;font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--amber-dim);font-family:var(--mono)}
.panel-actions{display:flex;gap:8px;align-items:center}

.editor-surface{flex:1;min-height:280px}
.editor-surface.is-ready + .fallback-editor{display:none}
.fallback-editor{flex:1;min-height:280px;width:100%;border:0;resize:none;background:#0b1013;color:#cdd8da;font-family:var(--mono);font-size:13px;padding:14px;display:none}
.editor-surface.is-fallback{display:none}
.editor-surface.is-fallback + .fallback-editor{display:block}

.terminal-surface{flex:1;min-height:280px;background:#0c1512;padding:8px 6px 4px}
.generated-files{border-bottom:1px solid var(--line);padding:10px 16px}
.generated-files-title{font-family:var(--mono);font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:var(--amber-dim);margin-bottom:8px}
.generated-file{display:flex;align-items:center;gap:12px;padding:6px 0}
.generated-file span:first-child{font-family:var(--mono);font-size:13px;flex:1}
.generated-file-meta{color:var(--muted);font-size:12px;font-variant-numeric:tabular-nums}

/* -------------------------------------------------------------- firmware flasher */
button.ghost{background:transparent;border-color:var(--line2);color:var(--muted)}
button.ghost:hover{color:var(--ink);border-color:var(--amber-dim)}
.flash-overlay{position:fixed;inset:0;z-index:9998;display:flex;align-items:center;justify-content:center;
  background:rgba(4,8,10,.82);backdrop-filter:blur(4px);padding:20px}
.flash-overlay[hidden]{display:none}
.flash-card{width:min(600px,100%);background:var(--panel);border:1px solid var(--line2);border-radius:12px;
  padding:18px 20px;box-shadow:0 24px 60px rgba(0,0,0,.55);max-height:90vh;overflow:auto}
.flash-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:6px}
.flash-head h2{margin:0;font-size:1.05rem;color:var(--ink)}
.flash-x{background:transparent;border:0;color:var(--muted);font-size:22px;line-height:1;cursor:pointer;padding:2px 6px}
.flash-x:hover{color:var(--ink)}
.flash-sub{margin:0 0 14px;font-size:12.5px;color:var(--muted);line-height:1.55}
.flash-field{display:flex;flex-direction:column;gap:6px;font-size:12px;color:var(--muted);margin-bottom:10px}
.flash-field select{font-family:var(--sans);font-size:13px;color:var(--ink);background:var(--panel2);
  border:1px solid var(--line2);border-radius:7px;padding:8px 10px}
.flash-note{margin:0 0 14px;font-size:12px;color:var(--muted);line-height:1.5;
  background:var(--panel2);border:1px solid var(--line);border-radius:8px;padding:9px 11px}
.flash-note code{font-family:var(--mono);color:var(--amber)}
.flash-actions{display:flex;align-items:center;gap:12px;margin-bottom:12px}
.flash-status{font-size:12px;color:var(--muted);font-family:var(--mono)}
.flash-log{margin:0;background:#0b1013;border:1px solid var(--line);border-radius:8px;padding:10px 12px;
  font-family:var(--mono);font-size:12px;color:#cdd8da;min-height:80px;max-height:260px;overflow:auto;white-space:pre-wrap}