/* Assignment Guide specific styles - extends course.css */

/* ===== Engineering Workbook ===== */
body.assignment-workbook-page .page {
  width: min(1120px, calc(100% - 40px));
  max-width: none;
}

body.assignment-workbook-page > .pb-toc {
  display: none !important;
}

.assignment-workbook-page .workbook-banner {
  width: auto;
  margin: -54px 0 18px;
  padding: 30px 40px 24px;
  border-radius: 0 0 18px 18px;
}

.assignment-workbook-page .workbook-banner h1 {
  max-width: 920px;
  font-size: clamp(2.2rem, 4.2vw, 3.2rem);
  line-height: 1.02;
}

.assignment-workbook-page .workbook-banner .guide-lede {
  max-width: 760px;
  font-family: inherit;
  font-size: 1.05rem;
}

.assignment-workbook-page .workbook-banner .guide-meta {
  margin-top: 18px;
}

.workbook-version {
  margin: 0 0 12px;
  padding: 10px 0;
  border-width: 1px 0;
  background: transparent;
}

.workbook-source-line {
  margin: 0;
  color: var(--muted);
  font-size: 0.8rem;
}

.workbook-provenance {
  width: fit-content;
  margin-top: 5px;
  color: var(--muted);
  font-size: 0.76rem;
}

.workbook-provenance > summary {
  cursor: pointer;
}

.workbook-provenance-body {
  max-width: 720px;
  padding: 10px 0 4px;
}

.workbook-provenance-body p {
  margin: 0 0 4px;
}

.workbook-version-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.75fr) minmax(0, 1fr) minmax(0, 1.55fr) minmax(0, 1fr);
  gap: 28px;
}

.workbook-version-item p {
  margin: 5px 0 0;
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.55;
}

.workbook-version-link-row {
  display: grid;
  gap: 5px;
  margin-top: 6px;
}

.workbook-version-link-row a {
  color: var(--accent-dark);
  font-size: 0.84rem;
}

.workbook-kicker {
  margin: 0;
  color: var(--accent-dark);
  font-size: 0.7rem;
  font-weight: 850;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.workbook-shell {
  display: grid;
  grid-template-columns: minmax(0, 860px) minmax(200px, 220px);
  gap: 40px;
  align-items: start;
}

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

.workbook-intro {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(250px, 0.65fr);
  gap: 36px;
  padding: 28px 0 32px;
  border-bottom: 1px solid var(--line);
}

.assignment-workbook-page .workbook-intro h2 {
  margin: 8px 0 12px !important;
  font-size: clamp(1.45rem, 2.4vw, 1.95rem) !important;
  line-height: 1.18;
}

.workbook-intro-copy > p:last-child {
  margin-bottom: 0;
  color: var(--muted);
}

.workbook-capability-summary {
  padding-left: 22px;
  border-left: 1px solid var(--line);
}

.workbook-progress-copy {
  margin: 7px 0 12px;
  font-weight: 750;
}

.workbook-capability-list,
.workbook-checklist {
  display: grid;
  gap: 7px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.workbook-capability-list li {
  display: grid;
  grid-template-columns: 1.2rem 1fr;
  gap: 6px;
  color: var(--muted);
  font-size: 0.87rem;
}

.workbook-capability-list li.is-complete {
  color: var(--accent-dark);
  font-weight: 750;
}

.workbook-stage-map {
  display: flex;
  gap: 0;
  overflow-x: auto;
  margin: 20px 0 42px;
  padding: 0 0 10px;
  border-bottom: 1px solid var(--line);
  scrollbar-width: thin;
}

.workbook-stage-map a {
  flex: 0 0 auto;
  padding: 8px 14px;
  border-right: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.8rem;
  font-weight: 750;
  text-decoration: none;
}

.workbook-stage-map a:first-child {
  padding-left: 0;
}

.workbook-stage-map a:hover,
.workbook-stage-map a:focus-visible {
  color: var(--accent-dark);
}

.workbook-stage {
  scroll-margin-top: 88px;
  margin: 0 0 76px;
  padding: 0 0 62px;
  border-bottom: 2px solid var(--ink);
}

.workbook-stage-header {
  margin-bottom: 24px;
}

.workbook-stage-number {
  color: var(--accent-dark);
  font-size: 0.72rem;
  font-weight: 850;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.assignment-workbook-page .workbook-stage h2 {
  margin: 6px 0 20px !important;
  font-size: clamp(2rem, 4vw, 3rem) !important;
}

.assignment-workbook-page .workbook-stage h3 {
  margin-top: 0;
  font-size: 1.2rem;
}

.workbook-build {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 28px;
  padding: 20px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.workbook-build p {
  margin-bottom: 0;
}

.workbook-build-title {
  font-size: 1.05rem;
  font-weight: 750;
}

.workbook-depends {
  margin: 24px 0;
}

.workbook-lesson-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 9px;
}

.workbook-lesson-links a {
  padding: 6px 10px;
  border-bottom: 1px solid var(--accent);
  color: var(--accent-dark);
  background: color-mix(in srgb, var(--accent-soft) 35%, transparent);
  font-size: 0.82rem;
  text-decoration: none;
}

.workbook-readiness {
  margin: 24px 0;
  padding: 14px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.workbook-readiness summary,
.workbook-failure summary,
.workbook-hint summary,
.workbook-reference-library > summary {
  cursor: pointer;
  font-weight: 800;
}

.workbook-checklist {
  margin-top: 12px;
}

.workbook-checklist li::before {
  margin-right: 8px;
  color: var(--accent);
  content: "□";
}

.workbook-contract,
.workbook-definition,
.workbook-failures,
.workbook-experiment,
.workbook-hints,
.workbook-official,
.workbook-gate {
  margin: 32px 0;
}

.workbook-contract-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.workbook-contract-item {
  padding: 16px 18px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.workbook-contract-item:nth-child(4),
.workbook-contract-item:nth-child(5) {
  background: color-mix(in srgb, var(--paper-raised) 68%, transparent);
}

.workbook-contract-item ul,
.workbook-done-item ul {
  margin: 9px 0 0;
  padding-left: 1.1rem;
}

.workbook-contract-item li,
.workbook-done-item li {
  margin: 5px 0;
  font-size: 0.87rem;
  line-height: 1.55;
}

.workbook-done-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.workbook-done-item {
  padding: 17px 18px 17px 0;
}

.workbook-done-item + .workbook-done-item {
  padding-left: 18px;
  border-left: 1px solid var(--line);
}

.workbook-sanity {
  margin: 32px 0;
  padding: 22px 22px 20px;
  border-left: 3px solid var(--accent);
  background: color-mix(in srgb, var(--accent-soft) 28%, transparent);
}

.workbook-sanity h3 {
  margin: 6px 0 10px;
}

.workbook-sanity ul {
  margin-bottom: 10px;
}

.workbook-expect {
  margin-bottom: 0;
  padding-top: 10px;
  border-top: 1px solid color-mix(in srgb, var(--accent) 30%, transparent);
}

.workbook-failure,
.workbook-hint {
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
}

.workbook-failure ul,
.workbook-hint p {
  color: var(--muted);
}

.workbook-experiment {
  padding: 24px 0;
  border-top: 2px solid var(--ink);
  border-bottom: 1px solid var(--line);
}

.workbook-experiment-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 0;
  margin-top: 16px;
}

.workbook-experiment-step {
  min-width: 0;
  padding: 0 13px;
  border-left: 1px solid var(--line);
}

.workbook-experiment-step:first-child {
  padding-left: 0;
  border-left: 0;
}

.workbook-experiment-step p:last-child {
  margin: 7px 0 0;
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.5;
}

.workbook-problem-ids {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin-top: 10px;
}

.workbook-problem-ids code {
  padding: 5px 8px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--paper-raised);
  font-size: 0.75rem;
  overflow-wrap: anywhere;
}

.workbook-gate {
  padding: 24px;
  border: 1px solid color-mix(in srgb, var(--accent) 35%, var(--line));
  background: color-mix(in srgb, var(--accent-soft) 34%, transparent);
}

.workbook-gate-header {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 14px;
}

.workbook-gate-progress {
  color: var(--muted);
  font-variant-numeric: tabular-nums;
  font-weight: 750;
}

.workbook-gate-list {
  display: grid;
  gap: 8px;
}

.workbook-gate-item {
  display: grid;
  grid-template-columns: 1.2rem 1fr;
  gap: 8px;
  align-items: start;
  cursor: pointer;
  font-size: 0.88rem;
}

.workbook-gate-item input {
  width: 1rem;
  height: 1rem;
  margin-top: 0.22rem;
  accent-color: var(--accent-dark);
}

.workbook-stage.is-gate-complete .workbook-stage-number,
.workbook-stage.is-gate-complete .workbook-gate-progress {
  color: #9ef0bb;
}

.workbook-retrospective {
  margin: 16px 0 54px;
  padding: 32px 0;
  border-top: 2px solid var(--ink);
  border-bottom: 1px solid var(--line);
}

.assignment-workbook-page .workbook-retrospective h2 {
  margin: 6px 0 16px !important;
}

.workbook-retrospective-prompts li {
  margin: 12px 0;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}

.workbook-reference-library {
  margin: 42px 0;
  padding: 18px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.workbook-reference-library > summary {
  font-size: 1.05rem;
}

.workbook-reference-note {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
  margin: 22px 0;
  padding: 18px;
  border-left: 3px solid var(--accent);
  background: var(--paper-raised);
}

.workbook-reference-note p {
  margin: 0;
}

.workbook-reference-library .legacy-supplement > summary::before {
  display: inline-block;
  margin-right: 8px;
  padding: 2px 6px;
  border: 1px solid var(--warn);
  color: var(--warn);
  content: "Legacy Reference";
  font-size: 0.64rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.legacy-reference-label {
  display: inline-block;
  margin: 22px 0 4px;
  padding: 3px 7px;
  border: 1px solid var(--warn);
  color: var(--warn);
  font-size: 0.68rem;
  font-weight: 850;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.workbook-stage-nav {
  position: sticky;
  top: 88px;
  max-height: calc(100vh - 112px);
  overflow-y: auto;
  padding: 18px 0 18px 18px;
  border-left: 1px solid var(--line);
}

.workbook-stage-nav-label {
  display: flex;
  justify-content: space-between;
  margin: 0 0 12px;
  color: var(--muted);
  font-size: 0.7rem;
  font-weight: 850;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.workbook-stage-nav-progress {
  color: var(--accent-dark);
}

.workbook-stage-nav nav {
  display: grid;
}

.workbook-stage-nav a {
  padding: 8px 9px;
  border-left: 2px solid transparent;
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.35;
  text-decoration: none;
}

.workbook-stage-nav a:hover,
.workbook-stage-nav a:focus-visible,
.workbook-stage-nav a.is-active {
  border-left-color: var(--accent);
  color: var(--ink);
  background: color-mix(in srgb, var(--accent-soft) 35%, transparent);
}

.workbook-stage-nav .workbook-reference-link {
  margin-top: 10px;
  padding-top: 12px;
  border-top: 1px solid var(--line);
}

.workbook-primary-nav {
  display: flex;
  gap: 4px;
  margin: -6px 0 26px;
  padding: 8px 0;
  overflow-x: auto;
  border-bottom: 1px solid var(--line);
  scrollbar-width: thin;
}

.workbook-primary-nav a {
  flex: 0 0 auto;
  padding: 8px 14px;
  border-left: 2px solid transparent;
  color: var(--muted);
  font-size: 0.83rem;
  font-weight: 800;
  text-decoration: none;
}

.workbook-primary-nav a:first-child {
  border-left-color: var(--accent);
  color: var(--ink);
}

.workbook-primary-nav a:hover,
.workbook-primary-nav a:focus-visible {
  color: var(--accent-dark);
  background: color-mix(in srgb, var(--accent-soft) 30%, transparent);
}

.workbook-problem-reference {
  display: inline-grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2px;
  max-width: 100%;
  padding: 7px 9px;
  border: 1px solid var(--line);
  border-radius: 4px;
  color: var(--ink);
  background: var(--paper-raised);
  text-decoration: none;
}

.workbook-problem-reference.has-translation:hover,
.workbook-problem-reference.has-translation:focus-visible {
  border-color: var(--accent-dark);
  background: color-mix(in srgb, var(--accent-soft) 38%, var(--paper-raised));
}

.workbook-problem-reference.is-official-only {
  border-style: dashed;
  color: var(--muted);
}

.workbook-problem-reference code {
  padding: 0;
  border: 0;
  background: transparent;
}

.workbook-current-handout {
  display: inline-block;
  margin-top: 12px;
  color: var(--accent-dark);
  font-size: 0.84rem;
  font-weight: 750;
}

.workbook-problem-qualifier,
.workbook-problem-link-state {
  color: var(--muted);
  font-size: 0.67rem;
  line-height: 1.35;
}

.workbook-problem-reference.has-translation .workbook-problem-link-state {
  color: var(--accent-dark);
  font-weight: 750;
}

.assignment-localization,
.assignment-official-sources {
  scroll-margin-top: 92px;
  margin: 64px 0 38px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
}

.assignment-history-note {
  margin: 34px 0 50px;
  padding: 14px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.84rem;
}

.assignment-history-note > summary {
  cursor: pointer;
  font-weight: 750;
}

.assignment-history-body {
  max-width: 720px;
  padding: 12px 0 4px;
}

.assignment-history-body li {
  margin: 6px 0;
}

.assignment-archive-link {
  color: var(--muted);
  font-weight: 700;
}

.archive-page-label {
  margin: 0 0 18px;
  padding: 10px 14px;
  border-left: 3px solid var(--warn);
  color: var(--muted);
  background: var(--warn-soft);
  font-size: 0.82rem;
  font-weight: 750;
}

.assignment-legacy-archive > summary {
  cursor: pointer;
  list-style-position: inside;
  padding: 14px 0;
  color: var(--muted);
  font-size: 0.88rem;
  font-weight: 800;
  letter-spacing: 0.02em;
}

.assignment-legacy-archive > summary:hover,
.assignment-legacy-archive > summary:focus-visible {
  color: var(--accent-dark);
}

.assignment-legacy-archive:not([open]) {
  margin-bottom: 42px;
  padding-top: 18px;
  border-top-width: 1px;
}

.assignment-workbook-page .assignment-resource-header h2 {
  margin: 7px 0 12px !important;
  font-size: clamp(2rem, 4vw, 3rem) !important;
}

.assignment-resource-header > p:last-of-type {
  max-width: 720px;
  color: var(--muted);
}

.localization-version-notice {
  margin: 24px 0 32px;
  padding: 17px 19px;
  border-left: 3px solid var(--warn);
  background: color-mix(in srgb, var(--paper-raised) 76%, transparent);
}

.localization-version-notice > p:nth-child(2) {
  margin: 6px 0 16px;
  color: var(--muted);
  font-size: 0.88rem;
}

.localization-coverage {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0;
  border-top: 1px solid var(--line);
}

.localization-coverage-item {
  display: grid;
  gap: 3px;
  padding: 12px 12px 0 0;
}

.localization-coverage-item + .localization-coverage-item {
  padding-left: 12px;
  border-left: 1px solid var(--line);
}

.localization-coverage-item strong {
  font-size: 1.25rem;
  font-variant-numeric: tabular-nums;
}

.localization-coverage-item span {
  color: var(--muted);
  font-size: 0.7rem;
  line-height: 1.35;
}

.localized-problem-index {
  margin: 36px 0 46px;
  padding: 26px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.assignment-workbook-page .localized-problem-index h3 {
  margin: 6px 0 20px;
  font-size: 1.35rem;
}

.localized-problem-index-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px 28px;
}

.localized-problem-index-group {
  min-width: 0;
}

.localized-problem-index-group h4 {
  margin: 0 0 9px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line);
  font-size: 0.82rem;
}

.localized-problem-index-list {
  display: grid;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.localized-problem-index-link {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  min-width: 0;
  padding: 6px 7px;
  color: var(--ink);
  text-decoration: none;
}

a.localized-problem-index-link:hover,
a.localized-problem-index-link:focus-visible {
  background: color-mix(in srgb, var(--accent-soft) 35%, transparent);
}

.localized-problem-index-link code {
  min-width: 0;
  overflow-wrap: anywhere;
}

.localized-problem-index-link small {
  flex: 0 0 auto;
  color: var(--muted);
  font-size: 0.66rem;
  text-align: right;
}

.localized-problem-index-list .is-matched small {
  color: var(--accent-dark);
}

.localized-problem-index-list .is-official-only {
  opacity: 0.72;
}

.localized-problem-index-legacy {
  grid-column: 1 / -1;
}

.assignment-workbook-page .localized-source-outline {
  margin-top: 26px;
}

.assignment-workbook-page .localized-source-outline > h2 {
  margin: 7px 0 12px !important;
}

.assignment-workbook-page .localized-source-outline .problem-row {
  scroll-margin-top: 118px;
}

.assignment-workbook-page .localized-source-outline .problem-row > summary {
  grid-template-rows: auto auto auto auto;
}

.problem-version-status {
  grid-column: 1;
  grid-row: 4;
  width: max-content;
  max-width: 100%;
  margin-top: 3px;
  padding: 2px 6px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  font-size: 0.59rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.problem-version-status.is-id-matched {
  border-color: color-mix(in srgb, var(--accent-dark) 48%, var(--line));
  color: var(--accent-dark);
}

.problem-row.is-problem-target > summary {
  outline: 3px solid color-mix(in srgb, var(--accent) 54%, transparent);
  outline-offset: 3px;
  background: color-mix(in srgb, var(--accent-soft) 55%, var(--paper-raised));
}

.problem-workbook-backlinks {
  display: flex;
  flex-wrap: wrap;
  gap: 7px 12px;
  align-items: center;
  margin: -4px 0 20px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
}

.problem-workbook-backlinks a {
  color: var(--accent-dark);
  font-size: 0.76rem;
  font-weight: 750;
}

.problem-unmapped-copy {
  color: var(--muted);
  font-size: 0.76rem;
}

.official-resource-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 20px 0 28px;
}

.official-resource-links a {
  padding: 7px 10px;
  border-bottom: 1px solid var(--accent-dark);
  color: var(--accent-dark);
  background: color-mix(in srgb, var(--accent-soft) 28%, transparent);
  font-size: 0.82rem;
  font-weight: 750;
  text-decoration: none;
}

.official-current-map {
  margin-top: 34px;
}

.assignment-workbook-page .official-current-map > h2 {
  margin-top: 8px !important;
  font-size: clamp(1.55rem, 3vw, 2.2rem) !important;
}

.workbook-stage-nav .workbook-localization-link {
  margin-top: 10px;
  padding-top: 12px;
  border-top: 1px solid var(--line);
}

.workbook-stage-nav .workbook-reference-link {
  margin-top: 0;
  padding-top: 8px;
  border-top: 0;
}

@media (max-width: 1000px) {
  body.assignment-workbook-page .page {
    width: min(880px, calc(100% - 36px));
  }

  .workbook-version-grid {
    grid-template-columns: 1fr 1fr;
  }

  .workbook-version-boundary {
    grid-column: 1 / -1;
  }

  .workbook-shell {
    grid-template-columns: minmax(0, 1fr);
    gap: 0;
  }

  .workbook-stage-nav {
    z-index: 4;
    grid-row: 1;
    position: sticky;
    top: 62px;
    max-height: none;
    margin-bottom: 24px;
    padding: 10px 0;
    overflow: hidden;
    border: 1px solid var(--line);
    border-width: 1px 0;
    background: color-mix(in srgb, var(--paper) 94%, transparent);
    backdrop-filter: blur(8px);
  }

  .workbook-stage-nav-label {
    margin: 0 0 7px;
  }

  .workbook-stage-nav nav {
    display: flex;
    gap: 4px;
    overflow-x: auto;
    scrollbar-width: thin;
  }

  .workbook-stage-nav a {
    flex: 0 0 auto;
    border-left: 0;
    border-bottom: 2px solid transparent;
  }

  .workbook-stage-nav a.is-active {
    border-bottom-color: var(--accent);
  }

  .workbook-main {
    grid-row: 2;
  }

  .assignment-localization,
  .assignment-official-sources,
  .assignment-workbook-page .localized-source-outline .problem-row {
    scroll-margin-top: 88px;
  }

  .workbook-stage-map {
    display: none;
  }

  .workbook-experiment-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px 0;
  }

  .localized-problem-index-grid {
    grid-template-columns: 1fr;
  }

  .localized-problem-index-legacy {
    grid-column: auto;
  }

  .workbook-experiment-step:nth-child(odd) {
    padding-left: 0;
    border-left: 0;
  }
}

@media (max-width: 680px) {
  body.assignment-workbook-page .page {
    width: min(100% - 28px, 880px);
  }

  .assignment-workbook-page .workbook-banner {
    margin: -54px -14px 24px;
    padding: 32px 20px 28px;
    border-radius: 0;
  }

  .assignment-workbook-page .workbook-banner h1 {
    font-size: clamp(2.05rem, 10.5vw, 3rem);
  }

  .workbook-version-grid,
  .workbook-intro,
  .workbook-build,
  .workbook-contract-grid,
  .workbook-done-grid,
  .workbook-reference-note,
  .workbook-experiment-grid {
    grid-template-columns: 1fr;
  }

  .workbook-version-boundary {
    grid-column: auto;
  }

  .workbook-capability-summary {
    padding: 18px 0 0;
    border-top: 1px solid var(--line);
    border-left: 0;
  }

  .workbook-contract-item,
  .workbook-done-item,
  .workbook-done-item + .workbook-done-item {
    padding: 15px 0;
    border-right: 0;
    border-left: 0;
  }

  .workbook-contract-grid {
    border-left: 0;
  }

  .workbook-done-item + .workbook-done-item {
    border-top: 1px solid var(--line);
  }

  .workbook-experiment-step,
  .workbook-experiment-step:nth-child(odd) {
    padding: 0 0 14px 14px;
    border-bottom: 1px solid var(--line);
    border-left: 2px solid var(--accent);
  }

  .workbook-gate {
    padding: 20px 16px;
  }

  .workbook-problem-reference,
  .workbook-problem-ids code {
    max-width: 100%;
  }

  .workbook-primary-nav {
    margin-inline: -4px;
  }

  .workbook-primary-nav a {
    padding-inline: 10px;
  }

  .localization-coverage {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px 0;
  }

  .localization-coverage-item:nth-child(3) {
    padding-left: 0;
    border-left: 0;
  }

  .localized-problem-index-link {
    align-items: flex-start;
  }

  .localized-problem-index-link small {
    white-space: normal;
  }

  .assignment-workbook-page .localized-source-outline .problem-row > summary {
    min-width: 0;
  }

  .assignment-workbook-page .localized-source-outline .problem-row > summary strong,
  .assignment-workbook-page .localized-source-outline .problem-row > summary span {
    min-width: 0;
    overflow-wrap: anywhere;
  }
}

/* ===== Banner ===== */
.guide-banner {
  margin: -54px -36px 40px;
  padding: 56px 36px 36px;
  background: linear-gradient(135deg, #070907 0%, #0f5c39 55%, #1c8a56 100%);
  color: #d8f5e1;
  border-radius: 0 0 24px 24px;
  position: relative;
  overflow: hidden;
  width: calc(100% + 72px);
}

.guide-banner::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 60%;
  height: 200%;
  background: radial-gradient(ellipse, rgba(255,255,255,0.06), transparent 70%);
}

.guide-banner::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.15), transparent);
}

.guide-banner .guide-eyebrow {
  color: #9ef0bb;
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  margin: 0 0 12px;
  position: relative;
  z-index: 1;
}

.guide-banner h1 {
  color: white;
  font-family: ui-serif, Georgia, serif;
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 650;
  margin: 0 0 12px;
  letter-spacing: -0.03em;
  position: relative;
  z-index: 1;
}

.guide-banner .guide-lede {
  color: rgba(231, 248, 234, 0.85);
  font-family: ui-serif, Georgia, serif;
  font-size: 1.1rem;
  line-height: 1.65;
  max-width: 650px;
  margin: 0;
  position: relative;
  z-index: 1;
}

.guide-banner .guide-lede strong {
  color: #9ef0bb;
}

/* Meta pills */
.guide-meta {
  display: flex;
  gap: 10px;
  margin-top: 24px;
  flex-wrap: wrap;
  position: relative;
  z-index: 1;
}

.guide-meta span {
  padding: 6px 14px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: rgba(231, 248, 234, 0.9);
  font-size: 0.82rem;
  font-weight: 500;
  backdrop-filter: blur(4px);
}

/* ===== Component Table ===== */
.component-table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  background: var(--paper-raised);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow);
  border: 1px solid var(--line);
}

.component-table th {
  background: #070907;
  color: #d8f5e1;
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 14px 18px;
  text-align: left;
  font-weight: 700;
}

.component-table td {
  padding: 12px 18px;
  border-bottom: 1px solid var(--line);
  font-size: 0.88rem;
  vertical-align: middle;
}

.component-table tr:last-child td {
  border-bottom: none;
}

.component-table tr:hover td {
  background: var(--accent-soft);
}

.component-table .comp-name {
  font-weight: 700;
  font-family: "SF Mono", "Fira Code", Consolas, monospace;
  font-size: 0.82rem;
  color: var(--accent-dark);
}

.component-table .comp-lec {
  font-size: 0.78rem;
  color: var(--muted);
}

.spring-audit-scroll {
  width: 100%;
}

.spring-audit-table {
  width: 100% !important;
  max-width: 1038px;
  min-width: 900px;
  table-layout: fixed;
}

.spring-audit-table th:first-child,
.spring-audit-table td:first-child {
  width: 16%;
}

.spring-audit-table th:nth-child(2),
.spring-audit-table td:nth-child(2) {
  width: 48%;
}

.spring-audit-table td,
.spring-audit-table code {
  white-space: normal;
  overflow-wrap: anywhere;
  word-break: break-all;
}

/* ===== Step Cards ===== */
.step-card {
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 24px 24px 24px 60px;
  margin: 20px 0;
  box-shadow: var(--shadow);
  position: relative;
  transition: transform 0.15s, box-shadow 0.15s;
}

.step-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(47, 52, 43, 0.12);
}

.step-card .step-number {
  position: absolute;
  left: 16px;
  top: 20px;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--accent);
  color: white;
  font-size: 0.85rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 12px rgba(22, 101, 52, 0.3);
}

.step-card h3 {
  margin-top: 4px;
  color: var(--accent-dark);
}

/* ===== Pitfall Cards ===== */
.pitfall {
  background: var(--warn-soft);
  border: 1px solid rgba(138, 75, 8, 0.2);
  border-left: 4px solid var(--warn);
  border-radius: 10px;
  padding: 16px 20px;
  margin: 14px 0;
}

.pitfall strong {
  color: var(--warn);
}

/* ===== Connection Map ===== */
.connection-map {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 12px;
  margin: 24px 0;
}

.connection-item {
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 18px 14px;
  text-align: center;
  box-shadow: var(--shadow);
  transition: transform 0.15s;
}

.connection-item:hover {
  transform: translateY(-2px);
}

.connection-item .conn-lec {
  font-size: 0.72rem;
  font-weight: 800;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 8px;
}

.connection-item .conn-arrow {
  font-size: 1.2rem;
  color: var(--muted);
  margin: 6px 0;
}

.connection-item .conn-apply {
  font-size: 0.85rem;
  font-weight: 600;
}

/* ===== Mindset Banner ===== */
.mindset-banner {
  background: linear-gradient(135deg, var(--accent-soft), rgba(99,230,140,.05));
  border: 1px solid rgba(99, 230, 140, 0.2);
  border-radius: 14px;
  padding: 24px 24px 24px 56px;
  margin: 24px 0;
  position: relative;
}

.mindset-banner::before {
  content: '💡';
  font-size: 1.4rem;
  position: absolute;
  top: 22px;
  left: 18px;
}

.mindset-banner p {
  margin: 0;
  line-height: 1.7;
}

.mindset-banner p + p {
  margin-top: 10px;
}

/* ===== Assignment learning cockpit ===== */
.assignment-jump-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 22px 0 30px;
}

.assignment-jump-links a {
  padding: 8px 13px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--paper-raised);
  color: var(--accent-dark);
  font-size: 0.78rem;
  font-weight: 750;
  text-decoration: none;
  box-shadow: 0 2px 10px rgba(47, 52, 43, 0.06);
}

.assignment-jump-links a:hover {
  border-color: rgba(22, 101, 52, 0.38);
  background: var(--accent-soft);
}

.assignment-mission-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(260px, 0.75fr);
  gap: 16px;
  margin: 22px 0 30px;
}

.assignment-panel {
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--paper-raised);
  padding: 22px;
  box-shadow: var(--shadow);
}

.assignment-panel h2,
.assignment-panel h3 {
  margin-top: 0;
}

.assignment-panel-kicker {
  display: block;
  margin-bottom: 8px;
  color: var(--accent);
  font-size: 0.72rem;
  font-weight: 850;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.assignment-outcomes {
  display: grid;
  gap: 10px;
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
}

.assignment-outcomes li {
  position: relative;
  padding: 10px 12px 10px 34px;
  border-radius: 10px;
  background: color-mix(in srgb, var(--accent-soft) 64%, white);
  font-size: 0.86rem;
}

.assignment-outcomes li::before {
  content: '✓';
  position: absolute;
  left: 12px;
  color: var(--accent);
  font-weight: 900;
}

.assignment-route {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 10px;
  margin: 18px 0 30px;
  padding: 0;
  list-style: none;
  counter-reset: assignment-route;
}

.assignment-route li {
  min-height: 126px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 13px;
  background: var(--paper-raised);
  box-shadow: 0 3px 14px rgba(47, 52, 43, 0.07);
  counter-increment: assignment-route;
}

.assignment-route li::before {
  content: counter(assignment-route, decimal-leading-zero);
  display: block;
  margin-bottom: 15px;
  color: var(--accent);
  font-family: "SF Mono", "Fira Code", Consolas, monospace;
  font-size: 0.72rem;
  font-weight: 850;
  letter-spacing: 0.08em;
}

.assignment-route strong {
  display: block;
  margin-bottom: 6px;
  color: var(--ink);
  font-size: 0.9rem;
}

.assignment-route span {
  color: var(--muted);
  font-size: 0.78rem;
  line-height: 1.55;
}

.assignment-route-5 {
  grid-template-columns: repeat(5, minmax(0, 1fr));
}

.assignment-route-6 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.assignment-route-7 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.assignment-figure {
  margin: 28px 0 34px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--paper-raised);
  box-shadow: var(--shadow);
}

.assignment-figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 10px;
}

.assignment-figure figcaption {
  margin: 14px 4px 2px;
  color: var(--muted);
  font-size: 0.8rem;
  line-height: 1.6;
}

.knowledge-tree {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin: 20px 0 32px;
}

.knowledge-branch {
  position: relative;
  padding: 20px 20px 18px 24px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--paper-raised);
  box-shadow: 0 3px 14px rgba(47, 52, 43, 0.06);
}

.knowledge-branch::before {
  content: '';
  position: absolute;
  top: 18px;
  bottom: 18px;
  left: 0;
  width: 4px;
  border-radius: 0 4px 4px 0;
  background: var(--accent);
}

.knowledge-depth {
  display: inline-flex;
  margin-bottom: 8px;
  padding: 3px 8px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent-dark);
  font-size: 0.66rem;
  font-weight: 850;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.knowledge-branch h3 {
  margin: 0 0 10px;
  font-size: 1rem;
}

.knowledge-branch > p {
  margin: 0 0 12px;
  color: var(--muted);
  font-size: 0.82rem;
}

.knowledge-branch ul {
  margin: 0;
  padding-left: 18px;
}

.knowledge-branch li {
  margin: 6px 0;
  font-size: 0.82rem;
  line-height: 1.55;
}

.knowledge-branch li ul {
  margin-top: 5px;
  padding-left: 17px;
  color: var(--muted);
}

.cheatsheet-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin: 20px 0 32px;
}

.cheat-card {
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--paper-raised);
  box-shadow: 0 3px 14px rgba(47, 52, 43, 0.06);
}

.cheat-card h3 {
  margin: 0 0 12px;
  font-size: 0.96rem;
}

.cheat-card p,
.cheat-card li {
  font-size: 0.82rem;
  line-height: 1.6;
}

.cheat-card ul {
  margin-bottom: 0;
  padding-left: 18px;
}

.cheat-card .formula-line {
  margin: 8px 0;
  padding: 9px 11px;
  border-radius: 8px;
  background: var(--paper);
  overflow-x: auto;
}

.assignment-reference {
  margin: 28px 0 34px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--paper-raised);
  box-shadow: var(--shadow);
}

.assignment-reference > summary {
  padding: 17px 20px;
  color: var(--accent-dark);
  font-weight: 800;
  cursor: pointer;
}

.assignment-reference-body {
  padding: 0 20px 20px;
}

.source-outline .problem-outline {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px 12px;
}

.source-outline .problem-outline > .problem-row[open] {
  grid-column: 1 / -1;
}

.source-outline .problem-outline > .problem-row > summary {
  grid-template-columns: minmax(0, 1fr) 18px;
  grid-template-rows: auto auto auto;
  gap: 4px 10px;
  min-height: 86px;
  padding: 14px 12px;
  border-radius: 10px;
  background: color-mix(in srgb, var(--paper-raised) 88%, var(--accent-soft));
  align-content: center;
}

.source-outline .problem-outline > .problem-row > summary .problem-number {
  grid-column: 1;
  grid-row: 1;
  overflow-wrap: anywhere;
}

.source-outline .problem-outline > .problem-row > summary strong {
  grid-column: 1;
  grid-row: 2;
}

.source-outline .problem-outline > .problem-row > summary .problem-topics {
  grid-column: 1;
  grid-row: 3;
  padding-right: 0;
  text-align: left;
}

.source-outline .problem-outline > .problem-row > summary::after {
  grid-column: 2;
  grid-row: 1 / -1;
  align-self: center;
}

/* ===== Responsive ===== */
@media (max-width: 720px) {
  .guide-banner {
    margin: -34px -20px 28px;
    padding: 36px 20px 24px;
    border-radius: 0 0 16px 16px;
    width: calc(100% + 40px);
  }
  .step-card {
    padding-left: 54px;
  }
  .connection-map {
    grid-template-columns: repeat(2, 1fr);
  }
  .assignment-mission-grid,
  .knowledge-tree,
  .cheatsheet-grid,
  .source-outline .problem-outline {
    grid-template-columns: 1fr;
  }
  .assignment-route {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .assignment-panel,
  .knowledge-branch,
  .cheat-card {
    padding: 18px;
  }
}

@media (max-width: 460px) {
  .assignment-route {
    grid-template-columns: 1fr;
  }
}