:root {
  --bg: #0d1117; --panel: #151b24; --panel2: #1b222d; --inset: #0f141b;
  --ink: #e7edf5; --muted: #93a0b2; --faint: #5b6675;
  --line: #263040; --line2: #1c2531;
  --accent: #2dd4ee; --accent-dim: #17828f; --accent-soft: #0c2a31;
  --warn: #fbbf24; --good: #4ade80; --bad: #f87171;
  --mono: ui-monospace, "JetBrains Mono", "SF Mono", "SFMono-Regular", Menlo, Consolas, monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
* { box-sizing: border-box; }
/* The `hidden` attribute must win over class rules that set `display` (e.g. .ctl
   is display:flex, .figs is display:grid) — else method-dependent controls and the
   pre-run figure blocks never actually hide. */
[hidden] { display: none !important; }
html, body { margin: 0; }
body { background: var(--bg); color: var(--ink); font-family: var(--sans); line-height: 1.55;
  -webkit-font-smoothing: antialiased; }

/* ---------- top bar ---------- */
.topbar { position: sticky; top: 0; z-index: 10; display: flex; align-items: center; gap: 16px;
  padding: 12px 22px; background: rgba(13,17,23,.82); backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line); }
.brand { font-family: var(--mono); font-weight: 600; letter-spacing: -.01em; font-size: 15px; }
.brand .k { color: var(--accent); }
.brand small { display:block; font-size:10.5px; letter-spacing:.14em; text-transform:uppercase;
  color: var(--faint); font-weight: 400; margin-top: 1px; }
.spacer { flex: 1; }
.badge { font-family: var(--mono); font-size: 11.5px; padding: 4px 10px; border-radius: 999px;
  border: 1px solid var(--line); color: var(--muted); display:inline-flex; align-items:center; gap:7px; }
.dot { width: 7px; height: 7px; border-radius: 50%; background: var(--faint); }
.dot.ok { background: var(--good); box-shadow: 0 0 8px var(--good); }
.dot.bad { background: var(--bad); }
.user { font-family: var(--mono); font-size: 12.5px; color: var(--muted); }
.user a { color: var(--accent); text-decoration: none; }
.user a:hover { text-decoration: underline; }

/* ---------- layout ---------- */
.wrap { max-width: 1180px; margin: 0 auto; padding: 26px 22px 90px; }
.intro { color: var(--muted); font-size: 14.5px; max-width: 72ch; margin: 0 0 24px; }
.intro b { color: var(--ink); font-weight: 600; }

.card { background: var(--panel); border: 1px solid var(--line); border-radius: 14px;
  margin-bottom: 20px; overflow: hidden; transition: opacity .2s; }
.card.locked { opacity: .5; pointer-events: none; }
.card-hd { display: flex; align-items: baseline; gap: 14px; padding: 16px 20px;
  border-bottom: 1px solid var(--line2); background: var(--panel2); }
.step { font-family: var(--mono); font-size: 11px; font-weight: 600; letter-spacing: .12em;
  text-transform: uppercase; color: var(--accent); border: 1px solid var(--accent-dim);
  background: var(--accent-soft); border-radius: 7px; padding: 4px 9px; white-space: nowrap; }
.card-hd h2 { font-family: var(--mono); font-size: 16px; font-weight: 600; margin: 0; letter-spacing: -.01em; }
.card-hd p { margin: 2px 0 0; color: var(--muted); font-size: 13px; }
.card-bd { padding: 20px; }

/* ---------- controls ---------- */
.controls { display: flex; flex-wrap: wrap; gap: 22px 30px; align-items: flex-end; margin-bottom: 4px; }
.ctl { display: flex; flex-direction: column; gap: 7px; min-width: 150px; }
.ctl label { font-family: var(--mono); font-size: 11px; letter-spacing: .06em; text-transform: uppercase;
  color: var(--muted); display: flex; justify-content: space-between; gap: 10px; }
.ctl label .val { color: var(--accent); font-weight: 600; }
input[type=range] { -webkit-appearance: none; appearance: none; width: 100%; height: 4px; border-radius: 3px;
  background: var(--line); outline: none; }
input[type=range]::-webkit-slider-thumb { -webkit-appearance: none; width: 15px; height: 15px; border-radius: 50%;
  background: var(--accent); cursor: pointer; border: 2px solid var(--bg); }
input[type=range]::-moz-range-thumb { width: 15px; height: 15px; border-radius: 50%; background: var(--accent);
  cursor: pointer; border: 2px solid var(--bg); }
input[type=number], select { font-family: var(--mono); font-size: 13px; background: var(--inset);
  color: var(--ink); border: 1px solid var(--line); border-radius: 8px; padding: 8px 10px; }
input:focus, select:focus, button:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }
.radios { display: flex; gap: 8px; flex-wrap: wrap; }
.radios label { font-family: var(--mono); font-size: 12px; text-transform: none; letter-spacing: 0;
  padding: 7px 12px; border: 1px solid var(--line); border-radius: 8px; cursor: pointer; color: var(--muted);
  display: inline-flex; align-items: center; gap: 7px; user-select: none; }
.radios input { accent-color: var(--accent); }
.radios label:has(input:checked) { border-color: var(--accent-dim); background: var(--accent-soft); color: var(--ink); }

button.run { font-family: var(--mono); font-size: 13px; font-weight: 600; color: #04222a;
  background: var(--accent); border: 0; border-radius: 9px; padding: 10px 18px; cursor: pointer;
  display: inline-flex; align-items: center; gap: 9px; white-space: nowrap; }
button.run:hover { filter: brightness(1.08); }
button.run:disabled { background: var(--line); color: var(--faint); cursor: not-allowed; }
.file { font-family: var(--mono); font-size: 12.5px; }
.file input { color: var(--muted); }

.spin { width: 14px; height: 14px; border: 2px solid rgba(4,34,42,.35); border-top-color: #04222a;
  border-radius: 50%; animation: spin .7s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
@media (prefers-reduced-motion: reduce) { .spin { animation-duration: 2s; } }

.hint { font-family: var(--mono); font-size: 11.5px; color: var(--faint); margin-top: 12px; }
/* Per-parameter help for Stage 2: param name (accent) mapped to its effect, so it's
   clear which line describes which control. */
.param-help { display: grid; gap: 7px; margin-top: 16px; font-family: var(--mono); font-size: 12px; color: var(--muted); }
.param-help .row { display: grid; grid-template-columns: max-content 1fr; gap: 14px; align-items: baseline; }
.param-help .pk { color: var(--accent); font-weight: 600; white-space: nowrap; }
.param-help .pk::before { content: "› "; color: var(--accent-dim); }
@media (max-width: 640px) { .param-help .row { grid-template-columns: 1fr; gap: 2px; } }
.err { font-family: var(--mono); font-size: 12.5px; color: var(--bad); background: rgba(248,113,113,.08);
  border: 1px solid rgba(248,113,113,.3); border-radius: 8px; padding: 9px 12px; margin-top: 14px; display: none; }
.err.show { display: block; }

/* ---------- image output ---------- */
.figs { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 16px; margin-top: 20px; }
.fig { border: 1px solid var(--line); border-radius: 10px; overflow: hidden; background: var(--inset); }
.fig .lab { font-family: var(--mono); font-size: 11px; letter-spacing: .05em; text-transform: uppercase;
  color: var(--muted); padding: 9px 12px; border-bottom: 1px solid var(--line2); display: flex;
  justify-content: space-between; gap: 10px; }
.fig .lab .count { color: var(--accent); font-weight: 600; }
.fig img { display: block; width: 100%; height: auto; image-rendering: pixelated; background:
  repeating-conic-gradient(#12171f 0% 25%, #0f141b 0% 50%) 50% / 18px 18px; }
.viewtabs { display: inline-flex; gap: 4px; margin-left: auto; }
.viewtabs button { font-family: var(--mono); font-size: 10.5px; padding: 2px 8px; border-radius: 6px;
  border: 1px solid var(--line); background: transparent; color: var(--muted); cursor: pointer; }
.viewtabs button.active { border-color: var(--accent-dim); background: var(--accent-soft); color: var(--accent); }
.meta { font-family: var(--mono); font-size: 12px; color: var(--muted); margin-top: 14px; display: flex; gap: 20px; flex-wrap: wrap; }
.meta b { color: var(--ink); }

/* ---------- login ---------- */
.login-wrap { min-height: 100dvh; display: grid; place-items: center; padding: 24px; }
.login { width: 100%; max-width: 360px; background: var(--panel); border: 1px solid var(--line);
  border-radius: 16px; padding: 30px 28px; }
.login h1 { font-family: var(--mono); font-size: 20px; margin: 0 0 4px; letter-spacing: -.01em; }
.login h1 .k { color: var(--accent); }
.login .sub { color: var(--faint); font-family: var(--mono); font-size: 11px; letter-spacing: .12em;
  text-transform: uppercase; margin: 0 0 24px; }
.login form { display: flex; flex-direction: column; gap: 14px; }
.login input[type=text], .login input[type=password] { font-family: var(--mono); font-size: 14px;
  background: var(--inset); color: var(--ink); border: 1px solid var(--line); border-radius: 9px; padding: 11px 13px; }
.login button { font-family: var(--mono); font-weight: 600; font-size: 14px; color: #04222a;
  background: var(--accent); border: 0; border-radius: 9px; padding: 12px; cursor: pointer; margin-top: 4px; }
.login button:hover { filter: brightness(1.08); }
.login .err { display: block; margin: 0 0 4px; }