/* =========================================================
   LABORATÓRIO HTML MESTRE
   Adição segura: não redesenha a sala, apenas adiciona prática.
   ========================================================= */

.dm-lab {
  margin: 22px auto;
  width: min(1180px, calc(100% - 32px));
  border: 1px solid rgba(34, 197, 94, 0.24);
  border-radius: 28px;
  background:
    radial-gradient(circle at top left, rgba(34, 197, 94, 0.12), transparent 34%),
    radial-gradient(circle at bottom right, rgba(56, 189, 248, 0.10), transparent 34%),
    linear-gradient(180deg, rgba(15, 23, 42, 0.96), rgba(2, 6, 23, 0.92));
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.24);
  padding: clamp(18px, 3vw, 28px);
  color: #e5e7eb;
}

.dm-lab * {
  box-sizing: border-box;
}

.dm-lab__top {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(220px, 0.65fr);
  gap: 18px;
  align-items: stretch;
}

.dm-lab h2 {
  margin: 14px 0 10px;
  color: #ffffff;
  font-size: clamp(1.45rem, 3vw, 2.2rem);
  letter-spacing: -0.04em;
}

.dm-lab p {
  color: #cbd5e1;
  line-height: 1.7;
}

.dm-lab-score {
  border: 1px solid rgba(148, 163, 184, 0.22);
  border-radius: 22px;
  background: rgba(2, 6, 23, 0.72);
  padding: 18px;
}

.dm-lab-score strong {
  display: block;
  color: #22c55e;
  font-size: clamp(2rem, 5vw, 3.4rem);
  line-height: 1;
}

.dm-lab-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 18px;
  margin-top: 18px;
}

.dm-lab-panel {
  border: 1px solid rgba(148, 163, 184, 0.18);
  border-radius: 22px;
  background: rgba(2, 6, 23, 0.58);
  padding: 18px;
  min-width: 0;
}

.dm-lab-panel h3 {
  margin: 0 0 12px;
  color: #e0f2fe;
  font-size: 1.04rem;
}

.dm-lab-editor {
  width: 100%;
  min-height: 390px;
  resize: vertical;
  border-radius: 18px;
  border: 1px solid rgba(148, 163, 184, 0.22);
  background: #020617;
  color: #fef3c7;
  padding: 16px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  font-size: 0.9rem;
  line-height: 1.6;
  tab-size: 2;
}

.dm-lab-preview {
  width: 100%;
  min-height: 390px;
  border: 1px solid rgba(148, 163, 184, 0.22);
  border-radius: 18px;
  background: #ffffff;
}

.dm-lab-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 14px;
}

.dm-lab-btn {
  border: 1px solid rgba(56, 189, 248, 0.28);
  border-radius: 999px;
  background: rgba(15, 23, 42, 0.88);
  color: #e5e7eb;
  padding: 11px 14px;
  font-weight: 900;
  cursor: pointer;
}

.dm-lab-btn--primary {
  background: linear-gradient(135deg, #22c55e, #38bdf8, #f7c948);
  color: #020617;
  border-color: transparent;
}

.dm-lab-validator {
  display: grid;
  gap: 10px;
  margin-top: 18px;
}

.dm-lab-rule {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  border: 1px solid rgba(148, 163, 184, 0.16);
  border-radius: 16px;
  background: rgba(15, 23, 42, 0.62);
  padding: 12px;
}

.dm-lab-rule strong {
  color: #94a3b8;
  min-width: 24px;
}

.dm-lab-rule.is-ok {
  border-color: rgba(34, 197, 94, 0.42);
  background: rgba(34, 197, 94, 0.10);
}

.dm-lab-rule.is-ok strong {
  color: #22c55e;
}

.dm-lab-rule.is-bad {
  border-color: rgba(251, 113, 133, 0.36);
  background: rgba(251, 113, 133, 0.08);
}

.dm-lab-rule.is-bad strong {
  color: #fb7185;
}

.dm-lab-feedback {
  margin-top: 12px;
  border-radius: 16px;
  padding: 14px;
  border: 1px solid rgba(34, 197, 94, 0.24);
  background: rgba(34, 197, 94, 0.08);
  color: #bbf7d0;
  font-weight: 800;
  display: none;
}

.dm-lab-feedback.is-visible {
  display: block;
}

@media (max-width: 900px) {
  .dm-lab__top,
  .dm-lab-grid {
    grid-template-columns: 1fr;
  }

  .dm-lab {
    width: min(100% - 20px, 1180px);
    margin: 16px auto;
  }

  .dm-lab-editor,
  .dm-lab-preview {
    min-height: 320px;
  }
}