/* ConceptStep SQL: scoped teaching and disposable browser lab. */
.sql-course { padding-block: 38px 75px; }
.sql-course__intro { max-width: 900px; margin-bottom: 30px; }
.sql-course__meta { color: #596679; font-size: .94rem; }
.sql-course__layout { display: grid; grid-template-columns: minmax(0,1fr) minmax(360px, .95fr); gap: 24px; align-items: start; }
.sql-course__theory, .sql-course__practice { min-width: 0; }
.sql-course__section { margin-bottom: 20px; }
.sql-course__section h2 { font-size: clamp(1.3rem, 2vw, 1.7rem); }
.sql-course__section p { line-height: 1.65; }
.sql-course__section pre, .sql-lab__schema-entry pre { margin: 12px 0; padding: 15px; color: #ebf5ff; background: #142b43; border-radius: 9px; overflow: auto; font-size: .94rem; white-space: pre-wrap; overflow-wrap: anywhere; }
.sql-course__example-note { font-size: .92rem; color: #3f536d; }
.sql-course__action { display: inline-block; padding: 9px 15px; border: 1px solid #246f9e; border-radius: 7px; color: #16466b; background: #fff; font: inherit; font-weight: 650; cursor: pointer; text-decoration: none; }
.sql-course__action:hover { background: #e7f4fd; }
.sql-course__action:focus-visible, .sql-lab__editor:focus-visible { outline: 3px solid #338ec3; outline-offset: 2px; }
.sql-course__action:disabled { opacity: .55; cursor: wait; }
.sql-course__action--primary { color: #fff; background: #176390; }
.sql-course__action--primary:hover { background: #0c4c73; color: #fff; }
.sql-course__actions { display: flex; flex-wrap: wrap; gap: 9px; margin: 12px 0; }
.sql-course__lab { position: sticky; top: 18px; min-width: 0; }
.sql-course__lab-panel {
  max-height: calc(100vh - 36px);
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-gutter: stable;
  scroll-behavior: smooth;
}
.sql-course__lab-panel::-webkit-scrollbar { width: 10px; }
.sql-course__lab-panel::-webkit-scrollbar-thumb { background: #bfd1df; border-radius: 999px; border: 2px solid transparent; background-clip: padding-box; }
.sql-lab__editor { width: 100%; min-height: 160px; resize: vertical; padding: 14px; border: 1px solid #8fa8bb; border-radius: 9px; color: #15334d; background: #f9fcff; font: 15px/1.55 Consolas, Monaco, monospace; tab-size: 2; }
.sql-lab__message { min-height: 24px; margin: 12px 0; font-size: .92rem; color: #1b5c46; }
.sql-lab__message--error { color: #a22a2a; }
.sql-lab__active-exercise { margin: 8px 0; font-weight: 600; color: #273f60; }
.sql-lab__row-count { margin: 0 0 8px; font-weight: 600; }
.sql-lab__table-scroll { max-height: 320px; overflow: auto; border: 1px solid #dce6ee; border-radius: 7px; }
.sql-lab__table-scroll table { border-collapse: collapse; width: 100%; font-size: .88rem; }
.sql-lab__table-scroll caption { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }
.sql-lab__table-scroll th, .sql-lab__table-scroll td { padding: 8px 10px; text-align: left; border-bottom: 1px solid #e2ecf3; vertical-align: top; }
.sql-lab__table-scroll thead { position: sticky; top: 0; background: #e5f2fa; }
.sql-lab__table-scroll tr:nth-child(even) { background: #f7fbff; }
.sql-lab__schema-entry { margin-top: 9px; }
.sql-lab__schema-entry summary { cursor: pointer; font-weight: 700; }
.sql-lab__schema-entry pre { font-size: .82rem; }
.sql-course__exercise { padding: 17px; border-left: 4px solid #5b93b9; margin-bottom: 12px; }
.sql-course__exercise h3 { font-size: 1.08rem; }
.sql-course__exercise p { margin-bottom: 12px; }
.sql-course__footnote { color: #526078; font-size: .9rem; }
.sql-course__navigation { display: flex; gap: 12px; flex-wrap: wrap; justify-content: space-between; margin-top: 28px; }
@media (max-width: 1040px) {
  .sql-course__layout { grid-template-columns: minmax(0,1fr); }
  .sql-course__lab { position: static; }
  .sql-course__lab-panel { max-height: none; overflow-y: visible; scrollbar-gutter: auto; }
}
@media (max-width: 600px) { .sql-course { padding-top: 18px; } .sql-course__actions > * { flex: 1 1 auto; } .sql-lab__editor { min-height: 130px; } }

/* Formative exercise feedback: never claim a grade for browser-side SQL. */
.sql-course__formative { margin: 14px 0; padding: 13px 16px; border: 1px solid #c5d9e7; border-radius: 9px; background: #f7fbfe; }
.sql-course__formative .sql-course__footnote { margin: 0 0 7px; }
.sql-course__practice-feedback { color: #193f64; font-weight: 600; white-space: pre-line; margin: 7px 0; }
.sql-course__hint, .sql-course__solution { white-space: pre-wrap; overflow-wrap: anywhere; padding: 12px; border-radius: 6px; margin: 9px 0; line-height: 1.5; font: .91rem/1.55 Consolas, Monaco, monospace; }
.sql-course__hint:empty, .sql-course__solution[hidden] { display: none; }
.sql-course__hint { background: #e9f4f9; color: #174463; }
.sql-course__solution { background: #eaf7ed; color: #154b32; }

.sql-course__exercise { transition: border-color .16s ease, box-shadow .16s ease, background-color .16s ease; }
.sql-course__exercise-heading { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.sql-course__exercise-heading h3 { margin-bottom: 0; }
.sql-course__exercise--active {
  border-left-color: #176390;
  border-color: #83b9d8;
  background: #f0f8fd;
  box-shadow: 0 0 0 3px rgba(23, 99, 144, .12);
}
.sql-course__exercise-active-label {
  display: inline-flex;
  align-items: center;
  padding: 5px 9px;
  border-radius: 999px;
  background: #176390;
  color: #fff;
  font-size: .82rem;
  font-weight: 700;
  line-height: 1;
}
.sql-course__exercise-active-label[hidden] { display: none; }

.sql-course__practice-progress {
  display: grid;
  gap: 7px;
  max-width: 360px;
  margin: 10px auto 14px;
  color: #31526b;
  font-size: .94rem;
}
.sql-course__practice-progress progress {
  width: 100%;
  height: 10px;
  accent-color: #2b8a57;
}
.sql-course__exercise-badges { display: flex; align-items: center; gap: 7px; flex-wrap: wrap; }
.sql-course__exercise--complete {
  border-color: #66ae83;
  border-left-color: #2b8a57;
  background: #f2fbf6;
}
.sql-course__exercise--active.sql-course__exercise--complete {
  border-color: #2b8a57;
  box-shadow: 0 0 0 3px rgba(43, 138, 87, .16);
}
.sql-course__exercise-complete-label {
  display: inline-flex;
  align-items: center;
  padding: 5px 9px;
  border-radius: 999px;
  background: #2b8a57;
  color: #fff;
  font-size: .82rem;
  font-weight: 700;
  line-height: 1;
}
.sql-course__exercise-complete-label[hidden] { display: none; }