/* ARENA GROUPS — practice/arena-groups.js
   The x.y.z level: a group header over its first part, the part tag on each
   exercise heading, the lock note under a part's buttons, the review panel
   after a part ends, and the "Ready for 0.1.2" card.

   Nothing here restyles a `.nbv-*`, `.anb-*` or `.dd-ex-*` node beyond the
   classes arena-groups.js itself writes onto them. */

/* ── group header ─────────────────────────────────────────────── */
.agx-head {
  margin: 18px 0 10px;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent);
  border-radius: 10px;
  background: var(--panel);
}
.agx-head.is-complete {
  border-left-color: var(--ok);
}
.agx-head-top {
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-wrap: wrap;
}
.agx-id {
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--accent-text);
}
.agx-title {
  font-weight: 600;
  color: var(--text);
}
.agx-count {
  margin-left: auto;
  font-size: 0.85em;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}
.agx-bar {
  height: 6px;
  margin: 8px 0;
  border-radius: 3px;
  background: var(--border);
  overflow: hidden;
}
.agx-bar > span {
  display: block;
  height: 100%;
  background: var(--accent);
  transition: width 0.4s ease;
}
.agx-head.is-complete .agx-bar > span {
  background: var(--ok);
}
.agx-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.agx-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 9px 3px 4px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--bg);
  color: var(--text);
  font: inherit;
  font-size: 0.82em;
  font-family: var(--mono, ui-monospace, monospace);
  cursor: pointer;
}
.agx-chip-n {
  display: inline-grid;
  place-items: center;
  min-width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--border);
  font-size: 0.85em;
  font-family: inherit;
}
.agx-chip.is-next {
  border-color: var(--accent);
}
.agx-chip.is-next .agx-chip-n {
  background: var(--accent);
  color: var(--on-accent);
}
.agx-chip.is-solved .agx-chip-n {
  background: var(--ok);
  color: var(--on-accent);
}
.agx-chip.is-missed .agx-chip-n {
  background: var(--danger);
  color: var(--on-accent);
}
.agx-why {
  margin: 8px 0 0;
  font-size: 0.85em;
  color: var(--muted);
}

/* ── part tag on the exercise heading (and so in the contents tree) ── */
.agx-tag {
  margin-right: 0.4em;
  color: var(--accent-text);
  font-variant-numeric: tabular-nums;
}

/* ── lock note ────────────────────────────────────────────────── */
.agx-lock {
  margin: 6px 0 0;
  font-size: 0.85em;
  color: var(--muted);
}

/* ── review panel after a part ends ───────────────────────────── */
.agx-review {
  margin-top: 10px;
  padding: 10px 12px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--panel);
}
.agx-review.is-solved {
  border-color: rgba(var(--ok-rgb), 0.5);
}
.agx-review.is-missed {
  border-color: rgba(var(--danger-rgb), 0.45);
}
.agx-review p {
  margin: 0 0 8px;
}
.agx-review-row {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}
.agx-left {
  font-size: 0.85em;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}
.agx-btn {
  padding: 5px 12px;
  border: 1px solid var(--border);
  border-radius: 7px;
  background: var(--bg);
  color: var(--text);
  font: inherit;
  font-size: 0.9em;
  cursor: pointer;
}
.agx-btn.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--on-accent);
}

/* ── "Ready for 0.1.2" ────────────────────────────────────────── */
.agx-card {
  position: fixed;
  right: 16px;
  bottom: 16px;
  z-index: 60;
  width: min(340px, calc(100vw - 32px));
  padding: 14px 16px;
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent);
  border-radius: 12px;
  background: var(--panel);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.18);
}
.agx-card p {
  margin: 0 0 6px;
}
.agx-card-k {
  font-size: 0.85em;
  color: var(--muted);
}
.agx-card-t {
  font-weight: 600;
  color: var(--text);
}
.agx-card-n {
  font-size: 0.85em;
  color: var(--muted);
}
.agx-card .agx-review-row {
  margin-top: 10px;
}

/* The concept panel's "In the ARENA notebook" box (practice/arena-groups-route.js). */
.agx-kg {
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
}
.agx-kg-h {
  margin: 0 0 8px;
  font-size: 0.95em;
}
.agx-kg-row {
  margin: 0 0 10px;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-left: 3px solid var(--border);
  border-radius: 10px;
}
.agx-kg-row.is-ready { border-left-color: var(--accent); }
.agx-kg-row.is-solved { border-left-color: var(--ok); }
.agx-kg-row.is-missed { border-left-color: var(--danger); }
.agx-kg-top {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: baseline;
}
.agx-kg-id {
  font-variant-numeric: tabular-nums;
  font-weight: 600;
}
.agx-kg-sub,
.agx-kg-st {
  margin: 4px 0 8px;
  font-size: 0.85em;
  color: var(--muted);
}
.agx-kg-need {
  margin: 2px 4px 2px 0;
  padding: 1px 8px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: none;
  color: inherit;
  font: inherit;
  cursor: pointer;
}
.agx-kg-need:hover { border-color: var(--accent); }