:root {
  color-scheme: dark;
  --bg: #08111f;
  --panel: #101d30;
  --panel-2: #13243b;
  --text: #eef6ff;
  --muted: #9fb3ca;
  --accent: #57d3ff;
  --accent-2: #8df5b4;
  --danger: #ff8f8f;
  --border: #26445f;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: radial-gradient(circle at top left, #123659, var(--bg) 42rem);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.shell {
  width: min(960px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 2rem 0 3rem;
}

.hero {
  margin-bottom: 1.5rem;
}

.eyebrow,
.label {
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  margin: 0 0 0.35rem;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  font-size: clamp(2rem, 5vw, 4rem);
  line-height: 1;
  margin-bottom: 0.75rem;
}

.hero p:last-child {
  color: var(--muted);
  font-size: 1.1rem;
  max-width: 46rem;
}

.card {
  background: linear-gradient(145deg, rgba(16, 29, 48, 0.94), rgba(19, 36, 59, 0.88));
  border: 1px solid var(--border);
  border-radius: 1rem;
  box-shadow: 0 1.2rem 3rem rgba(0, 0, 0, 0.24);
  margin: 1rem 0;
  padding: 1.25rem;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

button,
input,
textarea {
  border-radius: 0.7rem;
  font: inherit;
}

button {
  background: var(--accent);
  border: 0;
  color: #04111f;
  cursor: pointer;
  font-weight: 800;
  padding: 0.8rem 1rem;
}

button:hover,
button:focus-visible {
  filter: brightness(1.08);
}

.mode-button {
  background: var(--panel-2);
  border: 1px solid var(--border);
  color: var(--text);
}

.mode-button.active {
  background: var(--accent-2);
  color: #052012;
}

.trainer-header {
  align-items: start;
  display: flex;
  gap: 1rem;
  justify-content: space-between;
}

#question {
  font-size: clamp(1.35rem, 3vw, 2.15rem);
  line-height: 1.2;
  white-space: pre-line;
}

.score {
  background: #07111f;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--accent-2);
  font-size: 1.25rem;
  font-weight: 900;
  padding: 0.55rem 0.9rem;
  white-space: nowrap;
}

.answer-form {
  display: grid;
  gap: 0.75rem;
  grid-template-columns: 1fr auto;
  margin-top: 1rem;
}

.answer-form label {
  color: var(--muted);
  font-weight: 700;
  grid-column: 1 / -1;
}

input,
textarea {
  background: #07111f;
  border: 1px solid var(--border);
  color: var(--text);
  min-width: 0;
  padding: 0.85rem 1rem;
}

textarea {
  font-family: "SFMono-Regular", Consolas, monospace;
  grid-column: 1 / 2;
  line-height: 1.45;
  resize: vertical;
}

input[hidden],
textarea[hidden] {
  display: none !important;
}

.feedback {
  border-radius: 0.8rem;
  margin-top: 1rem;
  padding: 1rem;
}

.feedback.correct {
  background: rgba(141, 245, 180, 0.12);
  border: 1px solid rgba(141, 245, 180, 0.55);
}

.feedback.incorrect {
  background: rgba(255, 143, 143, 0.12);
  border: 1px solid rgba(255, 143, 143, 0.55);
}

.secondary {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
  margin-top: 1rem;
}

.review-header {
  align-items: start;
  display: flex;
  gap: 1rem;
  justify-content: space-between;
}

.review-header p:last-child,
.empty-state {
  color: var(--muted);
}

.mistake-list {
  display: grid;
  gap: 0.75rem;
  margin: 1rem 0 0;
  padding-left: 1.25rem;
}

.mistake-list li:not(.empty-state) {
  background: rgba(255, 143, 143, 0.08);
  border: 1px solid rgba(255, 143, 143, 0.28);
  border-radius: 0.75rem;
  padding: 0.85rem;
}

.mistake-list strong,
.mistake-list span {
  display: block;
}

.mistake-list span {
  color: var(--muted);
  margin-top: 0.35rem;
}

.reference-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.reference li,
.reference p {
  color: var(--muted);
}

.reference code {
  background: rgba(7, 17, 31, 0.9);
  border: 1px solid rgba(38, 68, 95, 0.8);
  border-radius: 0.35rem;
  color: var(--accent-2);
  font-family: "SFMono-Regular", Consolas, monospace;
  padding: 0.08rem 0.28rem;
}

.bits {
  color: var(--accent-2) !important;
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 1.2rem;
  font-weight: 900;
  word-spacing: 0.6rem;
}

@media (max-width: 620px) {
  .trainer-header,
  .answer-form {
    display: block;
  }

  .score,
  .answer-form input,
  .answer-form textarea,
  .answer-form button {
    margin-top: 0.75rem;
    width: 100%;
  }
}


.view[hidden],
.drill-row[hidden] {
  display: none !important;
}

.primary-nav {
  margin-bottom: 0.85rem;
}

.nav-button {
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 0.7rem;
  color: var(--text);
  cursor: pointer;
  display: inline-block;
  font-weight: 800;
  padding: 0.8rem 1rem;
  text-decoration: none;
}

.nav-button.active {
  background: var(--accent);
  color: #04111f;
}

.blog-intro p:last-child {
  color: var(--muted);
}

.blog-layout,
.course-layout {
  display: grid;
  gap: 1rem;
  grid-template-columns: minmax(210px, 0.75fr) minmax(0, 2.25fr);
}

.lesson-list {
  border-right: 1px solid var(--border);
  padding-right: 1rem;
}

.lesson-card {
  background: #07111f;
  border: 1px solid var(--border);
  color: var(--text);
  display: block;
  margin-bottom: 0.75rem;
  padding: 0.85rem;
  text-align: left;
  width: 100%;
}

.lesson-card span {
  color: var(--accent);
  display: block;
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  margin-bottom: 0.25rem;
  text-transform: uppercase;
}

.lesson-card.active {
  border-color: var(--accent-2);
  box-shadow: 0 0 0 2px rgba(141, 245, 180, 0.12);
}

.career-intro {
  border-color: rgba(141, 245, 180, 0.35);
}

.course-artifact {
  color: var(--accent-2);
  margin-bottom: 0.8rem;
}

.course-week-list {
  max-height: 72vh;
  overflow-y: auto;
  scrollbar-color: var(--border) transparent;
}

.lesson-content {
  min-width: 0;
}

.lesson-header {
  border-bottom: 1px solid var(--border);
  margin-bottom: 1.25rem;
  padding-bottom: 1rem;
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.tag-row span {
  background: rgba(87, 211, 255, 0.1);
  border: 1px solid rgba(87, 211, 255, 0.28);
  border-radius: 999px;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 700;
  padding: 0.25rem 0.55rem;
}

.lesson-body {
  color: var(--muted);
  line-height: 1.65;
}

.lesson-body h2,
.lesson-body h3,
.lesson-body h4,
.lesson-body h5 {
  color: var(--text);
  margin-bottom: 0.5rem;
  margin-top: 1.45rem;
}

.lesson-body p,
.lesson-body li {
  color: var(--muted);
}

.lesson-body strong {
  color: var(--text);
}

.lesson-body code {
  background: rgba(7, 17, 31, 0.9);
  border: 1px solid rgba(38, 68, 95, 0.8);
  border-radius: 0.35rem;
  color: var(--accent-2);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 0.9em;
  padding: 0.08rem 0.28rem;
}

.lesson-body pre {
  background: #050c16;
  border: 1px solid var(--border);
  border-radius: 0.85rem;
  overflow-x: auto;
  padding: 1rem;
}

.lesson-body pre code {
  background: transparent;
  border: 0;
  color: #d9f7ff;
  display: block;
  padding: 0;
  white-space: pre;
}

.lesson-body blockquote {
  background: rgba(87, 211, 255, 0.08);
  border-left: 4px solid var(--accent);
  border-radius: 0.35rem;
  color: var(--text);
  margin: 1rem 0;
  padding: 0.85rem 1rem;
}

.checklist {
  list-style: none;
  padding-left: 0;
}

.checklist li {
  align-items: start;
  display: flex;
  gap: 0.5rem;
}

.md-table {
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  margin: 1rem 0;
  overflow: hidden;
}

.md-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.md-row span {
  border-bottom: 1px solid var(--border);
  color: var(--muted);
  padding: 0.65rem;
}

.md-row:first-child span {
  background: rgba(87, 211, 255, 0.1);
  color: var(--text);
  font-weight: 800;
}

.md-row:last-child span {
  border-bottom: 0;
}

@media (max-width: 760px) {
  .blog-layout,
  .course-layout {
    grid-template-columns: 1fr;
  }

  .lesson-list {
    border-right: 0;
    border-bottom: 1px solid var(--border);
    padding-bottom: 1rem;
    padding-right: 0;
  }

  .md-row {
    grid-template-columns: 1fr;
  }
}