:root{--bg:#0d1117;--card:#161b22;--line:#21262d;--tx:#e6edf3;--dim:#8b949e;--grn:#3fb950;--red:#f85149;--amb:#d29922;--blu:#58a6ff;--pur:#bc8cff}

*{box-sizing:border-box;margin:0;padding:0}

html,body{background:var(--bg);color:var(--tx);font:13px ui-monospace,Menlo,monospace;height:100%}
body{padding:0 20px 32px;max-width:1180px;margin:auto}

h1,h2,h3{font-family:-apple-system,'Segoe UI',Roboto,sans-serif}

a{color:var(--blu);text-decoration:none}
a:hover{text-decoration:underline}

/* header */
.hdr{display:flex;align-items:baseline;justify-content:space-between;padding:18px 0 12px;border-bottom:1px solid var(--line);margin-bottom:0}
.hdr h1{font-size:18px;font-weight:600}
.hdr-sub{color:var(--dim);font-size:13px;font-weight:400}
.status{color:var(--dim);font-size:11.5px;font-family:ui-monospace,Menlo,monospace}
.status.err{color:var(--red)}

/* tabs */
.tabs{display:flex;gap:2px;border-bottom:1px solid var(--line);margin-bottom:18px;overflow-x:auto}
.tab{background:transparent;border:0;border-bottom:2px solid transparent;color:var(--dim);
  font:600 12.5px -apple-system,sans-serif;text-transform:uppercase;letter-spacing:.4px;
  padding:11px 16px;cursor:pointer;white-space:nowrap}
.tab:hover{color:var(--tx)}
.tab.active{color:var(--tx);border-bottom-color:var(--blu)}

/* pages */
.page{display:none}
.page.active{display:block}
.sub{color:var(--dim);font-size:11.5px;margin:4px 0 14px}

/* stats strip (prototype-style cards) */
.strip{display:flex;gap:26px;background:var(--card);border:1px solid var(--line);border-radius:10px;
  padding:12px 16px;margin:14px 0;flex-wrap:wrap}
.strip b{display:block;font-size:10px;color:var(--dim);font-weight:500;text-transform:uppercase;letter-spacing:.4px}
.strip .v{font-size:17px;font-weight:700}
.strip .v.g{color:var(--grn)}
.strip .v.r{color:var(--red)}

/* cards (scanner grid) */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(340px,1fr));gap:14px}
.card{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:14px}

/* tables */
table{width:100%;border-collapse:collapse;background:var(--card);border:1px solid var(--line);
  border-radius:10px;overflow:hidden;font:12.5px ui-monospace,Menlo,monospace}
th{font-size:10px;color:var(--dim);text-transform:uppercase;letter-spacing:.3px;text-align:right;
  padding:8px 10px;border-bottom:1px solid var(--line);font-weight:500}
td{padding:7px 10px;text-align:right;border-bottom:1px solid var(--line)}
th:first-child,td:first-child{text-align:left}
tr:last-child td{border-bottom:none}
tbody tr:hover{background:rgba(255,255,255,.03)}
tr.clickable{cursor:pointer}

/* chips */
.chip{display:inline-block;padding:2px 8px;border-radius:20px;font-size:10.5px;font-weight:700;margin:2px 4px 2px 0}
.c-red{background:#3d1d1f;color:var(--red)}
.c-grn{background:#1b3022;color:var(--grn)}
.c-amb{background:#3a2d10;color:var(--amb)}
.c-blu{background:#152a45;color:var(--blu)}
.c-pur{background:#2b2140;color:var(--pur)}
.c-dim{background:#21262d;color:var(--dim)}

/* pos/neg inline values */
.pos{color:var(--grn)}
.neg{color:var(--red)}

/* buttons */
button{font:600 12px -apple-system,sans-serif;padding:7px 14px;border-radius:6px;border:0;cursor:pointer}
.btn,button{background:var(--card);color:var(--tx);border:1px solid var(--line)}
.btn-primary,button.primary{background:#238636;color:#fff;border:0}
.btn-primary:hover,button.primary:hover{background:#2ea043}
.btn-secondary,button.secondary{background:#1f6feb;color:#fff;border:0}
.btn-secondary:hover,button.secondary:hover{background:#388bfd}
button:disabled{opacity:.5;cursor:default}

/* inputs */
input,select,textarea{background:var(--card);border:1px solid var(--line);color:var(--tx);
  padding:7px 10px;border-radius:6px;font:12px ui-monospace,Menlo,monospace}
input:focus,select:focus,textarea:focus{outline:1px solid var(--blu)}
textarea{width:100%;resize:vertical;font-size:11.5px}
label{display:block;font:600 11px -apple-system,sans-serif;color:var(--dim);text-transform:uppercase;
  letter-spacing:.3px;margin-bottom:4px}

/* settings form */
.form-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:16px;margin-bottom:20px}
.field{background:var(--card);border:1px solid var(--line);border-radius:8px;padding:12px}
.field input{width:100%}
.field .help{color:var(--dim);font-size:10.5px;margin-top:5px;line-height:1.4}
.field.readonly input{color:var(--dim);cursor:not-allowed}
.save-note{color:var(--grn);font-size:11.5px;margin-left:10px}

/* out-of-range flash alert */
.flash{animation:flashbg 1s ease-in-out infinite}
@keyframes flashbg{
  0%,100%{background:transparent}
  50%{background:rgba(248,81,73,.28)}
}

@media (max-width:900px){
  body{padding:0 12px 24px}
  .hdr{flex-direction:column;align-items:flex-start;gap:4px;padding:14px 0 10px}
  .tab{padding:9px 11px;font-size:11.5px}
  .form-grid{grid-template-columns:1fr 1fr}
  .grid{grid-template-columns:1fr}
  table{font-size:11.5px}
  th,td{padding:6px 6px}
}

@media (max-width:560px){
  .form-grid{grid-template-columns:1fr}
  .strip{gap:14px}
}

/* ladder page frame (approved reference implementation, isolated) */
.ladder-frame{width:100%;height:calc(100vh - 128px);min-height:560px;border:0;border-radius:10px;background:var(--card)}