/* ── Level section ── */
.level-section {
  margin-bottom: 32px;
}
.level-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}
.level-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  flex-shrink: 0;
}
.level-dot.green {
  background: #2ecc71;
  box-shadow: 0 0 6px #2ecc71;
}
.level-dot.yellow {
  background: #f39c12;
  box-shadow: 0 0 6px #f39c12;
}
.level-dot.orange {
  background: #e67e22;
  box-shadow: 0 0 6px #e67e22;
}
.level-dot.red {
  background: #e74c3c;
  box-shadow: 0 0 6px #e74c3c;
}
.level-title {
  font-size: 14px;
  font-weight: 700;
  color: #ccccee;
  letter-spacing: 0.5px;
}
.level-count {
  margin-left: auto;
  font-size: 11px;
  color: var(--text-dim);
}

/* ── Exercise card ── */
.exercise-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 6px;
  margin-bottom: 12px;
  overflow: hidden;
  transition: border-color 0.2s;
}
.exercise-card:hover {
  border-color: #5555aa;
}
.exercise-card.solved {
  border-color: var(--green-dark);
}

.exercise-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 18px;
  cursor: pointer;
}
.ex-number {
  background: var(--bg-btn);
  border: 1px solid var(--border-btn);
  color: var(--accent);
  font-weight: 700;
  font-size: 13px;
  min-width: 28px;
  height: 28px;
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.ex-question {
  flex: 1;
  font-size: 13px;
  color: #ccccee;
  line-height: 1.5;
}
.ex-question code {
  background: #252545;
  border: 1px solid var(--border-btn);
  padding: 1px 5px;
  border-radius: 3px;
  color: var(--accent);
  font-size: 11px;
}

.ex-toggle-btn {
  background: var(--bg-btn);
  border: 1px solid var(--border-btn);
  color: var(--text-muted);
  padding: 5px 12px;
  border-radius: 4px;
  font-size: 12px;
  cursor: pointer;
  white-space: nowrap;
  transition:
    background 0.2s,
    color 0.2s;
  flex-shrink: 0;
}
.ex-toggle-btn:hover {
  background: #3a3a60;
  color: #fff;
}
.ex-toggle-btn.visible {
  background: #1a3a2a;
  border-color: #2a6a4a;
  color: var(--green);
}

.solved-mark {
  color: var(--green);
  font-size: 16px;
  flex-shrink: 0;
  opacity: 0;
  transition: opacity 0.3s;
}
.exercise-card.solved .solved-mark {
  opacity: 1;
}

/* ── Answer panel ── */
.answer-panel {
  display: none;
  border-top: 1px solid #2a2a4a;
}
.answer-panel.open {
  display: block;
}

.answer-toolbar {
  background: #252545;
  padding: 8px 14px;
  display: flex;
  align-items: center;
  gap: 6px;
  border-bottom: 1px solid #2a2a4a;
}
.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}
.dot.red {
  background: #e74c3c;
}
.dot.yellow {
  background: #f39c12;
}
.dot.green {
  background: #2ecc71;
}
.answer-toolbar-label {
  font-size: 11px;
  color: var(--text-dim);
  margin-left: 6px;
}

.copy-btn {
  margin-left: auto;
  background: var(--bg-btn);
  border: 1px solid var(--border-btn);
  color: var(--text-muted);
  padding: 3px 10px;
  border-radius: 3px;
  font-size: 11px;
  cursor: pointer;
  transition:
    background 0.2s,
    color 0.2s;
}
.copy-btn:hover {
  background: #3a3a60;
  color: #fff;
}
.copy-btn.copied {
  background: #1a3a2a;
  border-color: #2a6a4a;
  color: var(--green);
}

/* ── SQL block (réponse) ── */
.sql-block {
  padding: 16px 20px;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.8;
  background: var(--bg-deep);
  white-space: pre;
}
.kw {
  color: #569cd6;
  font-weight: 700;
}
.fn {
  color: #dcdcaa;
}
.str {
  color: #ce9178;
}
.num {
  color: #b5cea8;
}
.cmt {
  color: #6a9955;
  font-style: italic;
}
.op {
  color: #d4d4d4;
}
.col-hl {
  color: #9cdcfe;
}

.answer-tip {
  padding: 10px 18px 14px;
  font-size: 12px;
  color: var(--text-muted);
  border-top: 1px solid #2a2a4a;
  line-height: 1.6;
}
.answer-tip strong {
  color: var(--accent);
}

.mark-btn {
  margin: 0 18px 14px;
  background: #1f3a28;
  border: 1px solid #2a8a4a;
  color: var(--green);
  font-size: 12px;
  padding: 6px 16px;
  border-radius: 4px;
  cursor: pointer;
  transition: background 0.2s;
  display: inline-block;
}
.mark-btn:hover {
  background: #2a5a38;
}

/* ── Jury box ── */
.jury-box {
  background: var(--bg-card);
  border: 1px solid var(--green-dark);
  border-left: 4px solid var(--green);
  border-radius: 6px;
  padding: 18px 22px;
  margin-top: 12px;
}
.jury-box-title {
  font-size: 12px;
  font-weight: 700;
  color: var(--green);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 10px;
}
.jury-box p {
  font-size: 13px;
  color: #ccccee;
  line-height: 1.7;
  font-style: italic;
}