/* QTC SCALE Lab — the codec workbench.
 * Personality: phosphor-terminal workbench — deep slate, phosphor green,
 * amber warnings, blueprint grid. Monospace-first: bytes are the product. */
:root {
  --bg: #070b14;
  --panel: #0c1322;
  --panel2: #101a2e;
  --line: #1d2a45;
  --txt: #d9e6ff;
  --dim: #8ba1c7;
  --faint:#7889aa;
  --grn: #4ade80;
  --grn-dim: #1d5c37;
  --amb: #fbbf24;
  --red: #f87171;
  --blu: #7cc4ff;
  --mono: "SF Mono", "Cascadia Code", Consolas, "Roboto Mono", Menlo, monospace;
}
* { box-sizing: border-box; }
body {
  margin: 0; color: var(--txt);
  font-family: -apple-system, "Segoe UI", Inter, Roboto, sans-serif;
  background:
    radial-gradient(1200px 500px at 80% -10%, rgba(74, 222, 128, 0.07), transparent 60%),
    radial-gradient(900px 500px at 10% 110%, rgba(124, 196, 255, 0.06), transparent 60%),
    var(--bg);
}
body::before {
  content: ""; position: fixed; inset: 0; pointer-events: none; z-index: 0;
  background-image:
    linear-gradient(rgba(74, 222, 128, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(74, 222, 128, 0.035) 1px, transparent 1px);
  background-size: 28px 28px;
}
main, header.topbar, footer.site { position: relative; z-index: 1; }
header.topbar {
  display: flex; align-items: center; gap: 16px;
  padding: 14px 20px; border-bottom: 1px solid var(--line);
  background: rgba(7, 11, 20, 0.9); backdrop-filter: blur(6px);
  position: sticky; top: 0; z-index: 10;
}
header.topbar .back { color: var(--dim); text-decoration: none; font-size: 14px; white-space: nowrap; }
header.topbar .back:hover { color: var(--grn); }
.brand { display: flex; align-items: center; gap: 12px; }
.brand-mark {
  width: 40px; height: 40px; border-radius: 10px; display: grid; place-items: center;
  font-size: 22px; background: linear-gradient(135deg, #0e2a1c, #123c26);
  border: 1px solid var(--grn-dim); box-shadow: 0 0 18px rgba(74, 222, 128, 0.25);
}
.brand strong { display: block; font-size: 17px; letter-spacing: 0.3px; }
.brand span { display: block; font-size: 12px; color: var(--dim); }
.top-actions { margin-left: auto; display: flex; gap: 8px; align-items: center; }
@media (max-width: 640px) {
  header.topbar { flex-wrap: wrap; row-gap: 10px; padding: 12px 14px; }
  .top-actions { flex-basis: 100%; margin-left: 0; justify-content: flex-start; flex-wrap: wrap; }
}
.pill {
  font-size: 12px; padding: 5px 12px; border-radius: 999px;
  border: 1px solid var(--grn-dim); color: var(--grn); background: rgba(74, 222, 128, 0.08);
  font-family: var(--mono); white-space: nowrap;
}
details.qmb-switch { position: relative; }
details.qmb-switch summary {
  cursor: pointer; list-style: none; font-size: 13px; color: var(--dim);
  border: 1px solid var(--line); border-radius: 8px; padding: 7px 14px; background: var(--panel);
}
details.qmb-switch summary:hover { color: var(--txt); border-color: var(--faint); }
details.qmb-switch summary::-webkit-details-marker { display: none; }
.qmb-menu {
  position: absolute; right: 0; top: calc(100% + 8px); width: 320px; max-height: 60vh; overflow: auto;
  background: var(--panel2); border: 1px solid var(--line); border-radius: 12px; padding: 8px;
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.6); z-index: 50;
}
.qmb-menu a {
  display: flex; gap: 10px; align-items: center; padding: 8px 10px; border-radius: 8px;
  color: var(--txt); text-decoration: none; font-size: 13px;
}
.qmb-menu a:hover { background: rgba(74, 222, 128, 0.08); }
.qmb-menu a.current { background: rgba(74, 222, 128, 0.12); border: 1px solid var(--grn-dim); }
.qmb-menu .ico { width: 22px; text-align: center; }
.qmb-menu .meta { display: block; font-size: 11px; color: var(--faint); }
.qmb-menu .hub-link { border-top: 1px solid var(--line); margin-top: 6px; padding-top: 10px; color: var(--grn); }

main { max-width: 1080px; margin: 0 auto; padding: 26px 20px 60px; }
.hero { margin: 6px 0 22px; }
.hero h1 { font-size: 30px; margin: 0 0 8px; letter-spacing: 0.2px; }
.hero h1 .accent { color: var(--grn); text-shadow: 0 0 24px rgba(74, 222, 128, 0.5); }
.hero p { color: var(--dim); max-width: 760px; line-height: 1.6; margin: 0; font-size: 15px; }
.hero p code, .note code { font-family: var(--mono); color: var(--grn); font-size: 0.92em; }

.tabs { display: flex; gap: 8px; flex-wrap: wrap; margin: 0 0 20px; }
.tab-btn {
  font-family: var(--mono); font-size: 13px; color: var(--dim);
  background: var(--panel); border: 1px solid var(--line); border-radius: 10px;
  padding: 10px 16px; cursor: pointer;
}
.tab-btn:hover { color: var(--txt); border-color: var(--faint); }
.tab-btn.active { color: var(--grn); border-color: var(--grn-dim); background: rgba(74, 222, 128, 0.08); box-shadow: 0 0 14px rgba(74, 222, 128, 0.12) inset; }
.tabpane { display: none; }
.tabpane.active { display: block; }

.card {
  background: var(--panel); border: 1px solid var(--line); border-radius: 14px;
  padding: 20px; margin-bottom: 18px;
}
.card h2 { font-size: 17px; margin: 0 0 6px; }
.card h2 .tag {
  font-family: var(--mono); font-size: 11px; color: var(--grn); border: 1px solid var(--grn-dim);
  border-radius: 6px; padding: 2px 8px; margin-left: 8px; vertical-align: 2px; background: rgba(74, 222, 128, 0.07);
}
.card .sub { color: var(--dim); font-size: 13.5px; line-height: 1.55; margin: 0 0 14px; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
@media (max-width: 860px) { .grid2 { grid-template-columns: 1fr; } }

label.f { display: block; font-size: 12px; color: var(--dim); margin: 12px 0 6px; font-family: var(--mono); text-transform: uppercase; letter-spacing: 0.6px; }
input[type=text], input[type=number], textarea, select {
  width: 100%; background: #080d18; border: 1px solid var(--line); border-radius: 9px;
  color: var(--txt); font-family: var(--mono); font-size: 14px; padding: 10px 12px;
}
input:focus, textarea:focus, select:focus { outline: none; border-color: var(--grn-dim); box-shadow: 0 0 0 2px rgba(74, 222, 128, 0.15); }
textarea { min-height: 76px; resize: vertical; }
.row { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }
.btn {
  font-family: var(--mono); font-size: 13px; cursor: pointer;
  background: rgba(74, 222, 128, 0.1); color: var(--grn); border: 1px solid var(--grn-dim);
  border-radius: 9px; padding: 10px 18px;
}
.btn:hover { background: rgba(74, 222, 128, 0.2); }
.btn.ghost { background: transparent; color: var(--dim); border-color: var(--line); }
.btn.ghost:hover { color: var(--txt); border-color: var(--faint); }
.btn.warn { color: var(--amb); border-color: #6b4d16; background: rgba(251, 191, 36, 0.07); }

.out {
  margin-top: 14px; background: #080d18; border: 1px solid var(--line); border-radius: 10px;
  padding: 14px 16px; font-family: var(--mono); font-size: 13.5px; line-height: 1.65;
  word-break: break-all; min-height: 20px;
}
.out:empty { display: none; }
.out .k { color: var(--faint); }
.out .v { color: var(--grn); }
.out .w { color: var(--amb); }
.out .e { color: var(--red); }
.out .b { color: var(--blu); }

.bytemap { display: flex; flex-wrap: wrap; gap: 4px; margin: 12px 0 4px; font-family: var(--mono); }
.bytemap .byte {
  min-width: 34px; text-align: center; padding: 6px 4px; font-size: 12.5px;
  background: #0a1120; border: 1px solid var(--line); border-radius: 6px; cursor: pointer;
  color: var(--txt);
}
.bytemap .byte:hover { border-color: var(--grn-dim); }
.bytemap .byte.sel { border-color: var(--grn); background: rgba(74, 222, 128, 0.14); color: var(--grn); }
.bytemap .idx { display: block; font-size: 9px; color: var(--faint); margin-top: 2px; }
.span-legend { font-family: var(--mono); font-size: 12px; color: var(--dim); margin-top: 8px; min-height: 18px; }
.span-legend .sw { display: inline-block; width: 10px; height: 10px; border-radius: 3px; margin-right: 6px; }

table.spec { width: 100%; border-collapse: collapse; font-family: var(--mono); font-size: 13px; margin-top: 10px; }
table.spec th { text-align: left; color: var(--faint); font-weight: 600; font-size: 11px; text-transform: uppercase; letter-spacing: 0.5px; padding: 8px 10px; border-bottom: 1px solid var(--line); }
table.spec td { padding: 8px 10px; border-bottom: 1px solid rgba(29, 42, 69, 0.5); vertical-align: top; }
table.spec tr:hover td { background: rgba(74, 222, 128, 0.03); }
table.spec td.hex { color: var(--grn); word-break: break-all; }

.verdict { border-radius: 10px; padding: 12px 16px; margin-top: 12px; font-size: 14px; display: none; }
.verdict.show { display: block; }
.verdict.ok { background: rgba(74, 222, 128, 0.08); border: 1px solid var(--grn-dim); }
.verdict.ok .v-title { color: var(--grn); font-weight: 700; font-family: var(--mono); }
.verdict.bad { background: rgba(248, 113, 113, 0.08); border: 1px solid #5c2323; }
.verdict.bad .v-title { color: var(--red); font-weight: 700; font-family: var(--mono); }
.verdict.warnv { background: rgba(251, 191, 36, 0.07); border: 1px solid #6b4d16; }
.verdict.warnv .v-title { color: var(--amb); font-weight: 700; font-family: var(--mono); }
.verdict .v-sub { color: var(--dim); font-size: 13px; margin-top: 4px; font-family: var(--mono); word-break: break-all; }

.chips { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 10px; }
.chip {
  font-family: var(--mono); font-size: 12px; color: var(--dim); background: var(--panel2);
  border: 1px solid var(--line); border-radius: 999px; padding: 6px 12px; cursor: pointer;
}
.chip:hover { color: var(--grn); border-color: var(--grn-dim); }

.diagram { font-family: var(--mono); font-size: 12.5px; line-height: 2; color: var(--dim); margin: 10px 0; }
.diagram .seg { display: inline-block; padding: 2px 10px; border-radius: 6px; margin: 2px; border: 1px solid var(--line); }
.diagram .seg.g { color: var(--grn); border-color: var(--grn-dim); background: rgba(74, 222, 128, 0.07); }
.diagram .seg.a { color: var(--amb); border-color: #6b4d16; background: rgba(251, 191, 36, 0.06); }
.diagram .seg.b { color: var(--blu); border-color: #274a6b; background: rgba(124, 196, 255, 0.06); }
.diagram .op { color: var(--faint); margin: 0 4px; }

.note {
  border-left: 3px solid var(--grn-dim); padding: 10px 14px; margin: 14px 0;
  background: rgba(74, 222, 128, 0.04); border-radius: 0 8px 8px 0;
  font-size: 13.5px; color: var(--dim); line-height: 1.6;
}
.note strong { color: var(--txt); }

.schema-row { display: flex; gap: 8px; margin-bottom: 8px; align-items: center; }
.schema-row input, .schema-row select { margin: 0; }
.schema-row .rm { flex: 0 0 auto; }

footer.site {
  border-top: 1px solid var(--line); padding: 26px 20px 40px; text-align: center;
  color: var(--faint); font-size: 13px; line-height: 2;
}
footer.site a { color: var(--dim); text-decoration: none; }
footer.site a:hover { color: var(--grn); }
footer.site .donate .addr {
  font-family: var(--mono); font-size: 12px; color: var(--grn); background: rgba(74, 222, 128, 0.07);
  border: 1px solid var(--grn-dim); border-radius: 8px; padding: 5px 10px; cursor: pointer; word-break: break-all;
}
footer.site .note { border: none; background: none; padding: 0; margin: 6px 0 0; font-size: 12px; }

.qsl-toasts { position: fixed; bottom: 22px; right: 22px; z-index: 99; display: flex; flex-direction: column; gap: 8px; }
.qsl-toast {
  background: var(--panel2); border: 1px solid var(--grn-dim); color: var(--grn);
  font-family: var(--mono); font-size: 13px; padding: 10px 16px; border-radius: 10px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5); opacity: 1; transition: opacity 0.4s;
}
.qsl-toast.out { opacity: 0; }