/* Learning SQL lab — extends site style.css, keeps it quiet */

.learn-shell {
  width: min(1080px, calc(100% - 2.5rem));
  margin: 0 auto 4rem;
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 2rem;
  align-items: start;
}

.learn-nav {
  position: sticky;
  top: 1rem;
  max-height: calc(100vh - 2rem);
  overflow: auto;
  padding-right: 0.5rem;
}

.stage-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--ink-faded);
  letter-spacing: 0.04em;
  margin: 1rem 0 0.35rem;
  text-transform: uppercase;
}

.stage-label:first-child { margin-top: 0; }

.lesson-link {
  display: grid;
  gap: 0.1rem;
  width: 100%;
  text-align: left;
  border: none;
  background: transparent;
  padding: 0.45rem 0.4rem;
  cursor: pointer;
  color: var(--ink);
  border-radius: 4px;
  font-family: var(--font-body);
}

.lesson-link .zh {
  font-size: 0.92rem;
  font-weight: 600;
}

.lesson-link .en {
  font-size: 0.78rem;
  color: var(--ink-faded);
  font-style: italic;
}

.lesson-link:hover { background: rgba(61, 47, 31, 0.05); }

.lesson-link.is-active {
  background: rgba(58, 90, 58, 0.1);
  box-shadow: inset 2px 0 0 var(--accent);
}

.lesson-link.done .zh::after {
  content: ' ✓';
  color: var(--accent);
}

.learn-main { min-width: 0; }

.theme-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 1.25rem;
  align-items: center;
}

.theme-row .label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--ink-faded);
  margin-right: 0.35rem;
}

.theme-btn, .schema-btn {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  border: 1px solid var(--rule);
  background: transparent;
  color: var(--ink);
  padding: 0.3rem 0.55rem;
  cursor: pointer;
  border-radius: 3px;
}

.theme-btn.is-active,
.schema-btn:hover,
.theme-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.mission h2 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.65rem;
  margin: 0 0 0.75rem;
  line-height: 1.25;
}

.mission h2 .en {
  display: block;
  font-size: 0.85em;
  color: var(--ink-soft);
  font-style: italic;
  font-weight: 500;
}

.concepts {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent);
  margin-bottom: 1rem;
}

.syntax-pattern {
  border: 1px solid var(--rule);
  background: var(--paper-warm);
  border-radius: 4px;
  padding: 0.75rem 1rem;
  margin: 1rem 0;
}

.syntax-pattern .syntax-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-faded);
  margin-bottom: 0.4rem;
}

.syntax-pattern pre {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--ink);
  margin: 0;
  white-space: pre-wrap;
  word-break: break-word;
}

.schema-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin: 1rem 0;
}

.editor-block {
  border: 1px solid var(--rule);
  background: #2a2218;
  margin: 1rem 0;
}

.editor-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.4rem 0.65rem;
  border-bottom: 1px solid rgba(255,255,255,0.08);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: #b8a88a;
}

.editor-bar button {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  border: 1px solid rgba(255,255,255,0.2);
  background: var(--accent);
  color: #f5f0e4;
  padding: 0.35rem 0.7rem;
  cursor: pointer;
}

#sql-editor {
  width: 100%;
  min-height: 160px;
  border: none;
  outline: none;
  resize: vertical;
  padding: 0.85rem 1rem;
  background: transparent;
  color: #f3ebe0;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  line-height: 1.5;
  tab-size: 2;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 0.75rem 0 1rem;
}

.actions button {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  border: 1px solid var(--rule);
  background: transparent;
  color: var(--ink);
  padding: 0.45rem 0.85rem;
  cursor: pointer;
}

.actions button.primary {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}

.actions button:hover { border-color: var(--accent); color: var(--accent); }
.actions button.primary:hover { background: var(--accent); border-color: var(--accent); color: #fff; }

#hint-box {
  border-left: 2px solid var(--accent);
  padding: 0.75rem 0 0.75rem 1rem;
  margin-bottom: 1rem;
  font-size: 0.95rem;
}

#results {
  border-top: 1px solid var(--rule);
  padding-top: 1rem;
}

.result-meta {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--ink-faded);
  margin: 0 0 0.5rem;
}

.result-meta.ok { color: var(--accent); }

.muted { color: var(--ink-faded); font-size: 0.9rem; }
.err { color: #8b3a3a; font-family: var(--font-mono); font-size: 0.85rem; }

.table-wrap { overflow: auto; max-height: 280px; }

#results table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-mono);
  font-size: 0.78rem;
}

#results th, #results td {
  text-align: left;
  padding: 0.35rem 0.55rem;
  border-bottom: 1px solid var(--rule);
  white-space: nowrap;
}

#results th {
  position: sticky;
  top: 0;
  background: var(--paper);
  font-weight: 600;
}

.status-line {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--ink-faded);
  margin-top: 0.75rem;
}

.learn-back {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  display: inline-block;
  margin-bottom: 1rem;
  color: var(--ink-soft);
  text-decoration: none;
}

.learn-back:hover { color: var(--accent); }

@media (max-width: 800px) {
  .learn-shell {
    grid-template-columns: 1fr;
  }
  .learn-nav {
    position: static;
    max-height: 200px;
    border-bottom: 1px solid var(--rule);
    padding-bottom: 1rem;
  }
}