.tool-layout {
  display: grid;
  gap: 1rem;
}

@media (min-width: 860px) {
  .tool-layout.split {
    grid-template-columns: 1fr 280px;
    align-items: start;
  }
  .tool-layout.split-wide {
    grid-template-columns: 1.2fr 1fr;
    align-items: start;
  }
}

.panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.panel-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  padding: 0.65rem 0.9rem;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.55);
}

.panel-head h2 {
  margin: 0;
  font-size: 0.95rem;
  font-weight: 650;
}

.panel-body { padding: 0.9rem; }

.challenge {
  border: 1px solid var(--line);
  border-left: 4px solid var(--accent);
  border-radius: var(--radius);
  background: var(--surface);
  padding: 0.85rem 1rem;
  margin-bottom: 1rem;
}

.challenge h2 {
  margin: 0 0 0.35rem;
  font-size: 0.95rem;
}

.challenge p {
  margin: 0 0 0.65rem;
  color: var(--muted);
  font-size: 0.92rem;
}

.challenge-status {
  font-family: var(--mono);
  font-size: 0.82rem;
  font-weight: 500;
  padding: 0.35rem 0.55rem;
  border-radius: 6px;
  display: inline-block;
}
.challenge-status.idle { background: var(--surface2); color: var(--muted); }
.challenge-status.pass { background: var(--ok-bg); color: var(--ok); }
.challenge-status.fail { background: var(--err-bg); color: var(--err); }

.tool-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.term {
  background: var(--term-bg);
  color: var(--term-fg);
  font-family: var(--mono);
  font-size: 0.86rem;
  line-height: 1.55;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid #2a3531;
  box-shadow: var(--shadow);
}

.term-bar {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.45rem 0.75rem;
  background: #141a18;
  color: var(--term-muted);
  font-size: 0.75rem;
}

.term-dot {
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 50%;
  background: #3a463f;
}
.term-dot.r { background: #c45c5c; }
.term-dot.y { background: #c4a03a; }
.term-dot.g { background: #3a9e6a; }

.term-out {
  margin: 0;
  padding: 0.85rem 1rem 0.25rem;
  min-height: 220px;
  max-height: 360px;
  overflow: auto;
  white-space: pre-wrap;
  word-break: break-word;
}

.term-line { margin: 0; }
.term-line .prompt { color: var(--term-prompt); }
.term-line .cmd { color: #fff; }
.term-line .err { color: #ff8f8f; }
.term-line .dim { color: var(--term-muted); }

.term-form {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.55rem 1rem 0.85rem;
  border-top: 1px solid #2a3531;
}

.term-form .prompt {
  color: var(--term-prompt);
  flex-shrink: 0;
}

.term-form input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  color: #fff;
  font-family: var(--mono);
  font-size: 0.86rem;
}

.hint-list {
  margin: 0;
  padding-left: 1.1rem;
  color: var(--muted);
  font-size: 0.88rem;
}
.hint-list li { margin-bottom: 0.25rem; }
.hint-list code {
  font-family: var(--mono);
  font-size: 0.82rem;
  background: var(--surface2);
  padding: 0.05rem 0.3rem;
  border-radius: 4px;
}

.tree-view {
  font-family: var(--mono);
  font-size: 0.8rem;
  line-height: 1.45;
  margin: 0;
  white-space: pre;
  overflow: auto;
  max-height: 420px;
  color: var(--ink);
}

.kbd-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-top: 0.5rem;
}

.kbd-row button {
  font-family: var(--mono);
  font-size: 0.75rem;
  padding: 0.28rem 0.5rem;
  border-radius: 5px;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink);
  cursor: pointer;
}
.kbd-row button:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* First-run worked example (see tools.md → Starter example) */
.starter-note {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.55rem 0.85rem;
  margin-bottom: 1rem;
  padding: 0.7rem 0.9rem;
  border: 1px solid var(--line);
  border-left: 4px solid var(--signal);
  border-radius: var(--radius);
  background: var(--surface);
  font-size: 0.92rem;
  color: var(--ink);
}
.starter-note p {
  margin: 0;
  flex: 1 1 14rem;
  color: var(--muted);
}
.starter-note strong {
  color: var(--ink);
}

/* Challenge “Show hint” callout (shared across labs) */
.chal-hint {
  margin: 0.5rem 0 0.75rem;
  padding: 0.55rem 0.75rem;
  border-radius: 8px;
  background: var(--warn-bg);
  color: var(--ink);
  border-left: 3px solid var(--signal);
  font-size: 0.9rem;
}
.chal-hint strong {
  color: var(--ink);
}