:root {
  --dsa-ink: #172033;
  --dsa-muted: #526070;
  --dsa-line: #d8e0ea;
  --dsa-soft: #f4f7fb;
  --dsa-panel: #ffffff;
  --dsa-primary: #116149;
  --dsa-primary-dark: #0b4635;
  --dsa-accent: #1d5fa7;
  --dsa-code: #111827;
}

.dsa-page {
  background: var(--dsa-soft);
  color: var(--dsa-ink);
}

.dsa-shell,
.dsa-shell * {
  box-sizing: border-box;
}

.dsa-shell {
  display: grid;
  grid-template-columns: minmax(14rem, 18rem) minmax(0, 1fr);
  gap: 1.25rem;
  width: 100%;
  max-width: 86rem;
  margin: 0 auto;
  padding: 1.25rem;
  overflow-x: clip;
}

.dsa-sidebar {
  align-self: start;
  position: sticky;
  top: 1rem;
  max-height: calc(100vh - 2rem);
  overflow: auto;
  border: 1px solid var(--dsa-line);
  border-radius: 8px;
  background: var(--dsa-panel);
  padding: 1rem;
}

.dsa-sidebar-home {
  display: inline-flex;
  width: 100%;
  margin-bottom: 1rem;
  color: var(--dsa-primary);
  font-weight: 800;
  text-decoration: none;
}

.dsa-sidebar-nav {
  display: grid;
  gap: 1rem;
}

.dsa-sidebar-group p {
  margin: 0 0 0.4rem;
  color: var(--dsa-muted);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.dsa-sidebar-group a {
  display: block;
  padding: 0.45rem 0.5rem;
  border-radius: 6px;
  color: var(--dsa-ink);
  font-size: 0.92rem;
  line-height: 1.35;
  text-decoration: none;
}

.dsa-sidebar-group a:hover,
.dsa-sidebar-group a.is-active {
  background: #e8f4ef;
  color: var(--dsa-primary-dark);
}

.dsa-main {
  display: grid;
  gap: 1rem;
  min-width: 0;
  max-width: 100%;
}

.dsa-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  color: var(--dsa-muted);
  font-size: 0.9rem;
}

.dsa-breadcrumb a,
.dsa-inline-link {
  color: var(--dsa-accent);
  font-weight: 700;
  text-decoration: none;
}

.dsa-breadcrumb a:hover,
.dsa-inline-link:hover {
  text-decoration: underline;
}

.dsa-hero,
.dsa-detail-header,
.dsa-panel {
  min-width: 0;
  max-width: 100%;
  border: 1px solid var(--dsa-line);
  border-radius: 8px;
  background: var(--dsa-panel);
  padding: clamp(1rem, 2.6vw, 2rem);
  overflow: hidden;
}

.dsa-hero h1,
.dsa-detail-header h1 {
  max-width: 52rem;
  margin: 0;
  color: var(--dsa-ink);
  font-size: clamp(2rem, 4vw, 4rem);
  line-height: 1.05;
  letter-spacing: 0;
  overflow-wrap: anywhere;
}

.dsa-detail-header h1 {
  font-size: clamp(1.9rem, 3vw, 3.1rem);
}

.dsa-hero p,
.dsa-detail-header p {
  max-width: 55rem;
  color: var(--dsa-muted);
  font-size: 1.05rem;
  line-height: 1.7;
  overflow-wrap: anywhere;
}

.dsa-eyebrow {
  margin: 0 0 0.45rem;
  color: var(--dsa-primary);
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.dsa-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: 1.25rem;
}

.dsa-button {
  display: inline-flex;
  max-width: 100%;
  min-height: 2.75rem;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--dsa-line);
  border-radius: 8px;
  background: #fff;
  color: var(--dsa-ink);
  font-weight: 800;
  padding: 0.7rem 1rem;
  text-decoration: none;
  text-align: center;
  white-space: normal;
  cursor: pointer;
  transition:
    background 160ms ease,
    border-color 160ms ease,
    color 160ms ease,
    box-shadow 160ms ease,
    transform 160ms ease;
}

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

.dsa-button:hover,
.dsa-button:focus-visible {
  border-color: #9fc0d6;
  background: #f4f9fc;
  color: var(--dsa-primary-dark);
  box-shadow: 0 0.45rem 1rem rgba(23, 32, 51, 0.12);
  transform: translateY(-1px);
}

.dsa-button-primary:hover,
.dsa-button-primary:focus-visible {
  border-color: var(--dsa-primary-dark);
  background: var(--dsa-primary-dark);
  color: #fff;
  box-shadow: 0 0.5rem 1.1rem rgba(11, 70, 53, 0.22);
}

.dsa-button:focus-visible {
  outline: 3px solid rgba(29, 95, 167, 0.24);
  outline-offset: 3px;
}

.dsa-button:disabled,
.dsa-button[disabled],
.dsa-button[aria-disabled="true"] {
  cursor: default;
  opacity: 0.58;
}

.dsa-button:disabled:hover,
.dsa-button:disabled:focus-visible,
.dsa-button[disabled]:hover,
.dsa-button[disabled]:focus-visible,
.dsa-button[aria-disabled="true"]:hover,
.dsa-button[aria-disabled="true"]:focus-visible {
  border-color: var(--dsa-line);
  background: #fff;
  color: var(--dsa-ink);
  box-shadow: none;
  transform: none;
}

.dsa-button-primary:disabled:hover,
.dsa-button-primary:disabled:focus-visible,
.dsa-button-primary[disabled]:hover,
.dsa-button-primary[disabled]:focus-visible,
.dsa-button-primary[aria-disabled="true"]:hover,
.dsa-button-primary[aria-disabled="true"]:focus-visible {
  border-color: var(--dsa-primary);
  background: var(--dsa-primary);
  color: #fff;
}

.dsa-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 9rem), 1fr));
  gap: 0.75rem;
  margin: 1.5rem 0 0;
}

.dsa-stats div {
  min-width: 0;
  border: 1px solid var(--dsa-line);
  border-radius: 8px;
  padding: 0.9rem;
}

.dsa-stats dt {
  color: var(--dsa-primary-dark);
  font-size: 1.45rem;
  font-weight: 900;
}

.dsa-stats dd {
  margin: 0.25rem 0 0;
  color: var(--dsa-muted);
  overflow-wrap: anywhere;
  line-height: 1.35;
}

.dsa-section-heading h2,
.dsa-roadmap-section h3 {
  margin: 0;
  color: var(--dsa-ink);
  letter-spacing: 0;
}

.dsa-section-copy,
.dsa-roadmap-section > p {
  max-width: 58rem;
  margin: 0.45rem 0 0;
  color: var(--dsa-muted);
  line-height: 1.65;
}

.dsa-section-list,
.dsa-roadmap-section,
.dsa-reader {
  display: grid;
  gap: 1rem;
}

.dsa-lesson-grid,
.dsa-project-grid,
.dsa-placeholder-grid,
.dsa-guide-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 16rem), 1fr));
  gap: 0.85rem;
}

.dsa-lesson-card,
.dsa-project-card,
.dsa-placeholder-grid article,
.dsa-guide-card {
  border: 1px solid var(--dsa-line);
  border-radius: 8px;
  background: #fff;
  padding: 1rem;
}

.dsa-lesson-card {
  color: var(--dsa-ink);
  text-decoration: none;
}

.dsa-lesson-card span,
.dsa-project-card > p:first-child {
  color: var(--dsa-primary);
  font-size: 0.78rem;
  font-weight: 800;
  text-transform: uppercase;
}

.dsa-lesson-card strong,
.dsa-project-card h3 {
  display: block;
  margin: 0.35rem 0;
  font-size: 1.05rem;
  line-height: 1.35;
}

.dsa-lesson-card small,
.dsa-project-card p,
.dsa-placeholder-grid p {
  color: var(--dsa-muted);
  line-height: 1.55;
}

.dsa-project-card h3 a {
  color: var(--dsa-ink);
  text-decoration: none;
}

.dsa-guide-card h3,
.dsa-visual-callout h3 {
  margin: 0;
  color: var(--dsa-ink);
  line-height: 1.3;
}

.dsa-guide-card ul {
  margin: 0.85rem 0 0;
  padding-left: 1.2rem;
}

.dsa-guide-card li {
  color: var(--dsa-muted);
  line-height: 1.6;
}

.dsa-guide-card li + li {
  margin-top: 0.45rem;
}

.dsa-flow-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 10rem), 1fr));
  gap: 0.75rem;
  margin: 1rem 0 0;
  padding: 0;
  list-style: none;
}

.dsa-flow-list li {
  display: grid;
  gap: 0.5rem;
  align-content: start;
  border: 1px solid var(--dsa-line);
  border-radius: 8px;
  background: #fff;
  padding: 1rem;
}

.dsa-flow-list span {
  display: inline-grid;
  width: 2rem;
  height: 2rem;
  place-items: center;
  border-radius: 999px;
  background: #e8f4ef;
  color: var(--dsa-primary-dark);
  font-weight: 900;
}

.dsa-flow-list strong {
  color: var(--dsa-ink);
  line-height: 1.35;
}

.dsa-visual-callout {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
  justify-content: space-between;
  margin-top: 1rem;
  border: 1px solid var(--dsa-line);
  border-radius: 8px;
  background: #f7fbf9;
  padding: 1rem;
}

.dsa-visual-callout p:not(.dsa-eyebrow) {
  max-width: 45rem;
  margin: 0.45rem 0 0;
  color: var(--dsa-muted);
  line-height: 1.6;
}

.dsa-content-panel .dsa-content {
  margin-top: 1rem;
}

.dsa-content {
  min-width: 0;
  max-width: 100%;
  border: 1px solid var(--dsa-line);
  border-radius: 8px;
  background: var(--dsa-panel);
  padding: clamp(1rem, 2.4vw, 2rem);
  overflow: hidden;
}

.dsa-content h1,
.dsa-content h2,
.dsa-content h3,
.dsa-content h4 {
  color: var(--dsa-ink);
  letter-spacing: 0;
  line-height: 1.2;
}

.dsa-content h1 {
  font-size: clamp(1.8rem, 3vw, 2.8rem);
}

.dsa-content h2 {
  margin-top: 2rem;
  font-size: clamp(1.35rem, 2.2vw, 1.8rem);
}

.dsa-content p,
.dsa-content li {
  color: #263244;
  line-height: 1.75;
}

.dsa-content ul,
.dsa-content ol {
  margin: 0.85rem 0 1.15rem;
  padding-left: 1.35rem;
  list-style-position: outside;
}

.dsa-content ul {
  list-style-type: disc;
}

.dsa-content ol {
  list-style-type: decimal;
}

.dsa-content li {
  padding-left: 0.25rem;
}

.dsa-content li + li {
  margin-top: 0.35rem;
}

.dsa-content li > ul,
.dsa-content li > ol {
  margin: 0.35rem 0 0.45rem;
  padding-left: 1.25rem;
}

.dsa-content ul ul {
  list-style-type: circle;
}

.dsa-content ul ul ul {
  list-style-type: square;
}

.dsa-content ol ol {
  list-style-type: lower-alpha;
}

.dsa-content ol ol ol {
  list-style-type: lower-roman;
}

.dsa-content li > p {
  margin: 0.25rem 0;
}

.dsa-content a {
  color: var(--dsa-accent);
  font-weight: 700;
}

.dsa-content table {
  display: block;
  width: 100%;
  overflow-x: auto;
  border-collapse: collapse;
  margin: 1rem 0;
}

.dsa-content th,
.dsa-content td {
  border: 1px solid var(--dsa-line);
  padding: 0.7rem;
  text-align: left;
  vertical-align: top;
}

.dsa-content th {
  background: #eef4f8;
}

.dsa-content pre {
  max-width: 100%;
  overflow-x: auto;
  border-radius: 8px;
  background: var(--dsa-code);
  color: #f8fafc;
  padding: 1rem;
}

.dsa-content code {
  border-radius: 5px;
  background: #e8eef5;
  color: #101828;
  padding: 0.1rem 0.25rem;
}

.dsa-content pre code {
  background: transparent;
  color: inherit;
  padding: 0;
}

.dsa-quick-check {
  display: grid;
  gap: 1rem;
  min-width: 0;
  max-width: 100%;
  border: 1px solid var(--dsa-line);
  border-radius: 8px;
  background: #fff;
  padding: clamp(1rem, 2.4vw, 1.5rem);
  -webkit-user-select: none;
  user-select: none;
}

.dsa-quick-check-header {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: flex-start;
  justify-content: space-between;
}

.dsa-quick-check-header h2 {
  margin: 0;
  color: var(--dsa-ink);
  font-size: clamp(1.25rem, 2vw, 1.65rem);
  letter-spacing: 0;
  line-height: 1.25;
}

.dsa-quick-check-badge {
  border: 1px solid #b7d7cb;
  border-radius: 999px;
  background: #e8f4ef;
  color: var(--dsa-primary-dark);
  font-size: 0.78rem;
  font-weight: 800;
  padding: 0.35rem 0.65rem;
  white-space: nowrap;
}

.dsa-quick-check-copy,
.dsa-quick-check-status {
  margin: 0;
  color: var(--dsa-muted);
  line-height: 1.6;
}

.dsa-quick-check-form,
.dsa-quick-check-list {
  display: grid;
  gap: 1rem;
  min-width: 0;
}

.dsa-quick-check-player {
  position: relative;
  display: grid;
  gap: 1rem;
  min-width: 0;
  overflow: hidden;
}

.dsa-quick-check-watermark {
  position: absolute;
  inset: 0;
  z-index: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(12rem, 1fr));
  gap: 1.75rem;
  align-content: center;
  pointer-events: none;
  opacity: 0.08;
  transform: rotate(-18deg) scale(1.05);
}

.dsa-quick-check-watermark span {
  color: var(--dsa-primary-dark);
  font-size: 0.78rem;
  font-weight: 900;
  line-height: 1.35;
  text-align: center;
  text-transform: uppercase;
}

.dsa-quick-check-player > :not(.dsa-quick-check-watermark):not(.dsa-quick-check-inactive-overlay) {
  position: relative;
  z-index: 1;
}

.dsa-quick-check-active-content {
  display: grid;
  gap: 1rem;
  transition: filter 160ms ease, opacity 160ms ease;
}

.dsa-quick-check-inactive-overlay {
  position: absolute;
  inset: 0;
  z-index: 3;
  display: none;
  place-content: center;
  gap: 0.35rem;
  border: 1px solid var(--dsa-line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.92);
  color: var(--dsa-ink);
  padding: 1rem;
  text-align: center;
}

.dsa-quick-check-inactive-overlay strong {
  font-size: 1.05rem;
}

.dsa-quick-check-inactive-overlay span {
  color: var(--dsa-muted);
  line-height: 1.45;
}

.dsa-quick-check-form.is-window-inactive .dsa-quick-check-active-content,
.dsa-quick-check-form.is-window-inactive .dsa-quick-check-nav,
.dsa-quick-check-form.is-window-inactive .dsa-quick-check-player-bar {
  filter: blur(8px);
  opacity: 0.32;
  pointer-events: none;
}

.dsa-quick-check-form.is-window-inactive .dsa-quick-check-inactive-overlay {
  display: grid;
}

.dsa-quick-check-summary {
  display: grid;
  gap: 1rem;
  min-width: 0;
  border: 1px solid var(--dsa-line);
  border-radius: 8px;
  background: #fbfdff;
  padding: 1rem;
}

.dsa-quick-check-summary h3 {
  margin: 0 0 0.3rem;
  color: var(--dsa-ink);
  font-size: 1.08rem;
  letter-spacing: 0;
}

.dsa-quick-check-score-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(9.5rem, 1fr));
  gap: 0.65rem;
}

.dsa-quick-check-score-grid div,
.dsa-quick-check-history-row {
  display: grid;
  gap: 0.2rem;
  min-width: 0;
  border: 1px solid var(--dsa-line);
  border-radius: 8px;
  background: #fff;
  padding: 0.7rem;
}

.dsa-quick-check-score-grid span,
.dsa-quick-check-score-grid small,
.dsa-quick-check-history-row span {
  color: var(--dsa-muted);
  font-size: 0.86rem;
  line-height: 1.35;
}

.dsa-quick-check-score-grid strong,
.dsa-quick-check-history-row strong {
  color: var(--dsa-ink);
  line-height: 1.3;
}

.dsa-quick-check-history {
  display: grid;
  gap: 0.55rem;
  min-width: 0;
}

.dsa-quick-check-player-bar,
.dsa-quick-check-player-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
  justify-content: space-between;
}

.dsa-quick-check-progress,
.dsa-quick-check-timer {
  color: var(--dsa-primary-dark);
  font-weight: 900;
}

.dsa-quick-check-timer {
  border: 1px solid #b7d7cb;
  border-radius: 999px;
  background: #e8f4ef;
  padding: 0.35rem 0.7rem;
}

.dsa-quick-check-timer.is-expired {
  border-color: #f2b8a0;
  background: #fff0ea;
  color: #9a3412;
}

.dsa-quick-check-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.dsa-quick-check-nav button {
  min-width: 2.25rem;
  min-height: 2.25rem;
  border: 1px solid var(--dsa-line);
  border-radius: 999px;
  background: #fff;
  color: var(--dsa-ink);
  font: inherit;
  font-weight: 900;
  cursor: pointer;
  transition:
    background 160ms ease,
    border-color 160ms ease,
    color 160ms ease,
    box-shadow 160ms ease,
    transform 160ms ease;
}

.dsa-quick-check-nav button:hover,
.dsa-quick-check-nav button:focus-visible {
  border-color: var(--dsa-primary);
  background: #f4f9fc;
  color: var(--dsa-primary-dark);
  box-shadow: 0 0.35rem 0.85rem rgba(23, 32, 51, 0.12);
  transform: translateY(-1px);
}

.dsa-quick-check-nav button:focus-visible {
  outline: 3px solid rgba(29, 95, 167, 0.24);
  outline-offset: 3px;
}

.dsa-quick-check-nav button:disabled,
.dsa-quick-check-nav button[disabled] {
  cursor: default;
  opacity: 0.58;
}

.dsa-quick-check-nav button:disabled:hover,
.dsa-quick-check-nav button:disabled:focus-visible,
.dsa-quick-check-nav button[disabled]:hover,
.dsa-quick-check-nav button[disabled]:focus-visible {
  border-color: var(--dsa-line);
  background: #fff;
  color: var(--dsa-ink);
  box-shadow: none;
  transform: none;
}

.dsa-quick-check-nav button.is-active {
  border-color: var(--dsa-primary);
  background: var(--dsa-primary);
  color: #fff;
}

.dsa-quick-check-nav button.is-active:hover,
.dsa-quick-check-nav button.is-active:focus-visible {
  border-color: var(--dsa-primary-dark);
  background: var(--dsa-primary-dark);
  color: #fff;
}

.dsa-quick-check-nav button.is-answered:not(.is-active) {
  border-color: #9fd3c2;
  background: #eef9f5;
}

.dsa-quick-check-nav button.is-unanswered:not(.is-active) {
  color: var(--dsa-muted);
}

.dsa-quick-check-question {
  display: grid;
  gap: 0.55rem;
  min-width: 0;
  margin: 0;
  border: 0;
  padding: 0;
  color: var(--dsa-ink);
  font-weight: 800;
  line-height: 1.45;
}

.dsa-quick-check-question legend {
  padding: 0;
  color: var(--dsa-ink);
  font-weight: 800;
}

.dsa-quick-check-options {
  display: grid;
  gap: 0.55rem;
}

.dsa-quick-check-option {
  display: flex;
  gap: 0.65rem;
  align-items: flex-start;
  width: 100%;
  min-width: 0;
  border: 1px solid var(--dsa-line);
  border-radius: 8px;
  background: #fbfdff;
  color: var(--dsa-ink);
  font-weight: 500;
  line-height: 1.55;
  padding: 0.75rem 0.85rem;
}

.dsa-quick-check-option input {
  flex: 0 0 auto;
  margin-top: 0.3rem;
}

.dsa-quick-check-option:has(input:checked) {
  border-color: #8cc8b5;
  background: #eef9f5;
}

.dsa-quick-check-option:has(input:focus-visible) {
  outline: 3px solid rgba(17, 97, 73, 0.18);
  border-color: var(--dsa-primary);
}

.dsa-quick-check-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
}

.dsa-quick-check-review {
  display: grid;
  gap: 0.45rem;
  border: 1px solid var(--dsa-line);
  border-radius: 8px;
  background: #fbfdff;
  padding: 1rem;
}

.dsa-quick-check-review h3 {
  margin: 0;
  color: var(--dsa-ink);
  letter-spacing: 0;
}

.dsa-quick-check-review p {
  margin: 0;
  color: var(--dsa-muted);
  line-height: 1.55;
}

.dsa-quick-check-warning,
.dsa-quick-check-status[data-tone="warning"] {
  color: #9a3412;
}

.dsa-quick-check-status[data-tone="success"] {
  color: var(--dsa-primary-dark);
}

.dsa-quick-check-status[data-tone="error"] {
  color: #991b1b;
}

.dsa-prev-next {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.85rem;
}

.dsa-prev-next a {
  border: 1px solid var(--dsa-line);
  border-radius: 8px;
  background: var(--dsa-panel);
  color: var(--dsa-ink);
  padding: 1rem;
  text-decoration: none;
}

.dsa-prev-next span {
  display: block;
  color: var(--dsa-muted);
  font-size: 0.85rem;
  font-weight: 800;
  text-transform: uppercase;
}

@media (max-width: 1100px) {
  .dsa-shell {
    grid-template-columns: 1fr;
    padding: 0.85rem;
  }

  .dsa-sidebar {
    position: static;
    max-height: 20rem;
  }

  .dsa-prev-next {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 520px) {
  .dsa-actions,
  .dsa-button {
    width: 100%;
  }

  .dsa-quick-check-player-actions .dsa-button,
  .dsa-quick-check-actions .dsa-button {
    width: auto;
    flex: 1 1 9rem;
  }

  .dsa-quick-check-player-bar {
    align-items: flex-start;
  }

  .dsa-quick-check-score-grid {
    grid-template-columns: 1fr;
  }

  .dsa-content,
  .dsa-hero,
  .dsa-detail-header,
  .dsa-quick-check,
  .dsa-panel {
    padding: 1rem;
  }

  .dsa-hero h1,
  .dsa-detail-header h1 {
    font-size: clamp(1.7rem, 9vw, 2.25rem);
  }

  .dsa-hero p,
  .dsa-detail-header p {
    font-size: 0.98rem;
  }

  .dsa-content ul,
  .dsa-content ol {
    padding-left: 1.2rem;
  }

  .dsa-content li {
    padding-left: 0.15rem;
  }

  .dsa-stats {
    grid-template-columns: 1fr;
    gap: 0.5rem;
  }

  .dsa-stats div {
    padding: 0.7rem 0.55rem;
  }

  .dsa-stats dt {
    font-size: 1.1rem;
  }

  .dsa-stats dd {
    font-size: 0.78rem;
  }
}