:root {
  --bg: #f7f3ec;
  --paper: #fff9ef;
  --ink: #111111;
  --shadow-color: #111111;
  --red: #ff4f38;
  --yellow: #ffd54d;
  --cyan: #45d6ff;
  --green: #8ef58b;
  --orange: #ff9d3c;
  --body-blob-1: #fff6be;
  --body-blob-2: #d5f8ff;
  --grid-line: rgba(17, 17, 17, 0.07);
  --surface: #ffffff;
  --surface-alt: #fffef3;
  --surface-cyan: #ddf8ff;
  --surface-orange: #ffe1c7;
  --surface-quote: #f7ffdb;
  --hero-grad-a: #fff7de;
  --hero-grad-b: #fffef8;
  --cta-grad-a: #ffe5cf;
  --cta-grad-b: #fff9ed;
  --progress-a: #ff6e5f;
  --progress-b: #ffd54d;
  --shadow: 6px 6px 0 var(--shadow-color);
  --shadow-sm: 4px 4px 0 var(--shadow-color);
  --border: 3px solid var(--ink);
}

body[data-theme="dark"] {
  --bg: #171717;
  --paper: #202020;
  --ink: #f4efe6;
  --shadow-color: #000000;
  --red: #c85b4f;
  --yellow: #8d6c22;
  --cyan: #2f6f80;
  --green: #3d7447;
  --orange: #975a2f;
  --body-blob-1: #322915;
  --body-blob-2: #17313a;
  --grid-line: rgba(244, 239, 230, 0.1);
  --surface: #2a2a2a;
  --surface-alt: #303030;
  --surface-cyan: #24383f;
  --surface-orange: #423126;
  --surface-quote: #2f3827;
  --hero-grad-a: #2b261f;
  --hero-grad-b: #232323;
  --cta-grad-a: #423126;
  --cta-grad-b: #232323;
  --progress-a: #cb6a5a;
  --progress-b: #9d7a2c;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: "Space Grotesk", sans-serif;
  background: radial-gradient(
      circle at 18% 10%,
      var(--body-blob-1) 0%,
      var(--body-blob-1) 12%,
      transparent 35%
    ),
    radial-gradient(circle at 90% 15%, var(--body-blob-2) 0%, var(--body-blob-2) 18%, transparent 45%),
    var(--bg);
  color: var(--ink);
  line-height: 1.5;
  padding: 1rem;
}

.page-grid {
  position: fixed;
  inset: 0;
  background-image: linear-gradient(to right, var(--grid-line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid-line) 1px, transparent 1px);
  background-size: 24px 24px;
  z-index: -1;
}

h1,
h2,
h3 {
  font-family: "Archivo Black", sans-serif;
  letter-spacing: 0.02em;
  margin-top: 0;
  margin-bottom: 0.6rem;
  line-height: 1.1;
}

p {
  margin-top: 0;
}

.topbar,
.section,
.footer {
  max-width: 1120px;
  margin-inline: auto;
}

.topbar {
  border: var(--border);
  background: var(--paper);
  box-shadow: var(--shadow);
  margin-top: 0.7rem;
  margin-bottom: 2.2rem;
  padding: 0.9rem 1rem;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
  justify-content: space-between;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  flex-wrap: wrap;
}

.brand {
  font-family: "Archivo Black", sans-serif;
  text-decoration: none;
  color: var(--ink);
  font-size: 1.15rem;
}

.navlinks {
  display: flex;
  gap: 0.9rem;
  flex-wrap: wrap;
}

.navlinks a {
  color: var(--ink);
  text-decoration: none;
  font-weight: 700;
}

.section {
  border: var(--border);
  background: var(--paper);
  box-shadow: var(--shadow);
  margin-bottom: 1.4rem;
  padding: 1.2rem;
}

.hero {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: 1rem;
  background: linear-gradient(
    145deg,
    var(--hero-grad-a) 0%,
    var(--hero-grad-a) 50%,
    var(--hero-grad-b) 50%,
    var(--hero-grad-b) 100%
  );
}

.eyebrow {
  display: inline-block;
  border: var(--border);
  box-shadow: var(--shadow-sm);
  background: var(--yellow);
  padding: 0.22rem 0.6rem;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.06em;
}

h1 {
  font-size: clamp(2rem, 5vw, 3.9rem);
  margin-top: 0.8rem;
}

h2 {
  font-size: clamp(1.45rem, 3.2vw, 2.5rem);
}

.lead {
  max-width: 62ch;
  font-size: clamp(1rem, 1.3vw, 1.2rem);
}

.button {
  display: inline-block;
  border: var(--border);
  box-shadow: var(--shadow-sm);
  background: var(--red);
  color: #fff;
  text-decoration: none;
  font-weight: 700;
  padding: 0.7rem 1rem;
  transition: transform 0.14s ease, box-shadow 0.14s ease;
}

.button:hover,
.button:focus-visible {
  transform: translate(-2px, -2px);
  box-shadow: 7px 7px 0 var(--shadow-color);
}

.button:focus-visible {
  outline: 3px dashed var(--ink);
  outline-offset: 3px;
}

.button:disabled {
  opacity: 0.58;
  cursor: not-allowed;
  transform: none;
  box-shadow: var(--shadow-sm);
}

.button-sm {
  padding: 0.45rem 0.8rem;
  background: var(--green);
  color: var(--ink);
}

.theme-toggle {
  border: var(--border);
  box-shadow: var(--shadow-sm);
  background: var(--yellow);
  color: var(--ink);
  font-weight: 700;
  font-family: inherit;
  font-size: 0.95rem;
  padding: 0.45rem 0.8rem;
  cursor: pointer;
  transition: transform 0.14s ease, box-shadow 0.14s ease;
}

.theme-toggle:hover,
.theme-toggle:focus-visible {
  transform: translate(-2px, -2px);
  box-shadow: 7px 7px 0 var(--shadow-color);
}

.theme-toggle:focus-visible {
  outline: 3px dashed var(--ink);
  outline-offset: 3px;
}

.theme-toggle[aria-pressed="true"] {
  background: var(--cyan);
}

.button-ghost {
  background: var(--cyan);
  color: var(--ink);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: 1.1rem;
}

.quick-stats {
  list-style: none;
  padding: 0;
  margin: 1.2rem 0 0;
  display: flex;
  gap: 0.7rem;
  flex-wrap: wrap;
}

.quick-stats li {
  border: var(--border);
  box-shadow: var(--shadow-sm);
  background: var(--surface);
  padding: 0.55rem 0.7rem;
  font-size: 0.95rem;
}

.hero-board {
  display: grid;
  gap: 0.8rem;
}

.board-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.8rem;
}

.board-card {
  border: var(--border);
  box-shadow: var(--shadow-sm);
  background: var(--surface);
  padding: 0.9rem;
}

.board-card-primary {
  background: var(--surface);
}

.how-visual {
  margin-top: 0.8rem;
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr;
  gap: 0.5rem;
  align-items: stretch;
}

.how-step {
  border: var(--border);
  box-shadow: var(--shadow-sm);
  padding: 0.55rem;
  display: grid;
  gap: 0.22rem;
}

.how-step strong {
  font-family: "Archivo Black", sans-serif;
  font-size: 0.9rem;
  line-height: 1.1;
}

.how-step small {
  font-size: 0.74rem;
  font-weight: 700;
  line-height: 1.25;
}

.how-step-diagnose {
  background: var(--surface-cyan);
}

.how-step-adapt {
  background: var(--surface-alt);
}

.how-step-recalibrate {
  background: var(--surface-orange);
}

.how-arrow {
  align-self: center;
  font-family: "Archivo Black", sans-serif;
  font-size: 1.15rem;
}

.how-note {
  margin: 0.8rem 0 0;
  font-size: 0.92rem;
}

.card-label {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.progress {
  border: var(--border);
  height: 18px;
  margin: 0.6rem 0 0.4rem;
  background: var(--surface);
}

.progress span {
  display: block;
  height: 100%;
  background: repeating-linear-gradient(
    45deg,
    var(--progress-a),
    var(--progress-a) 10px,
    var(--progress-b) 10px,
    var(--progress-b) 20px
  );
}

.accent-cyan {
  background: var(--surface-cyan);
}

.accent-orange {
  background: var(--surface-orange);
}

.section-head {
  margin-bottom: 1rem;
}

.course-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.8rem;
}

.course-link {
  text-decoration: none;
  color: inherit;
  display: block;
}

.course-link:focus-visible {
  outline: 3px dashed var(--ink);
  outline-offset: 4px;
}

.course-card {
  border: var(--border);
  box-shadow: var(--shadow-sm);
  background: var(--surface);
  padding: 1rem;
  transition: transform 0.14s ease;
}

.course-grid > .course-link:nth-child(odd) .course-card {
  background: var(--surface-alt);
}

.course-card:hover {
  transform: translate(-2px, -2px);
}

.course-link .course-card {
  height: 100%;
}

.course-page {
  --course-accent: var(--yellow);
  --course-accent-soft: var(--surface-alt);
  --course-accent-2: var(--surface-cyan);
}

.course-math {
  --course-accent: #ffd15e;
  --course-accent-soft: #fff4d7;
  --course-accent-2: #ddf8ff;
}

.course-science {
  --course-accent: #78dcff;
  --course-accent-soft: #e6f7ff;
  --course-accent-2: #ebffe6;
}

.course-engineering {
  --course-accent: #ffb660;
  --course-accent-soft: #fff0df;
  --course-accent-2: #ffe4d6;
}

.course-coding {
  --course-accent: #92e38f;
  --course-accent-soft: #ebffea;
  --course-accent-2: #dff5ff;
}

.course-data {
  --course-accent: #f8a6a1;
  --course-accent-soft: #ffe9e7;
  --course-accent-2: #fff4cf;
}

.course-robotics {
  --course-accent: #7ee6de;
  --course-accent-soft: #e7fffc;
  --course-accent-2: #fff1d9;
}

body[data-theme="dark"].course-page {
  --course-accent-soft: var(--surface-alt);
  --course-accent-2: var(--surface-cyan);
}

.course-hero {
  background: linear-gradient(135deg, var(--paper) 0%, var(--paper) 45%, var(--course-accent-soft) 45%);
}

.course-hero .reveal {
  max-width: 72ch;
}

.course-tag {
  display: inline-block;
  border: var(--border);
  box-shadow: var(--shadow-sm);
  background: var(--course-accent);
  padding: 0.2rem 0.6rem;
  font-weight: 700;
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.course-badges {
  list-style: none;
  margin: 1rem 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
}

.course-badges li {
  border: var(--border);
  box-shadow: var(--shadow-sm);
  background: var(--surface);
  padding: 0.45rem 0.6rem;
  font-size: 0.9rem;
  font-weight: 700;
}

.learn-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.8rem;
}

.learn-card {
  border: var(--border);
  box-shadow: var(--shadow-sm);
  background: var(--surface);
  padding: 0.95rem;
}

.learn-card:nth-child(even) {
  background: var(--course-accent-soft);
}

.learn-card h3 {
  font-size: 1.12rem;
}

.crumb-link {
  text-decoration: none;
  color: var(--ink);
  font-weight: 700;
  border-bottom: 2px solid var(--ink);
}

.course-cta {
  text-align: center;
  background: linear-gradient(180deg, var(--course-accent-soft) 0%, var(--paper) 100%);
}

.track-switcher {
  max-width: 1120px;
  margin-inline: auto;
  border: var(--border);
  box-shadow: var(--shadow);
  background: var(--paper);
  margin-bottom: 1.4rem;
  padding: 0.8rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
}

.track-pill {
  text-decoration: none;
  color: var(--ink);
  border: var(--border);
  box-shadow: var(--shadow-sm);
  background: var(--surface);
  padding: 0.38rem 0.62rem;
  font-size: 0.85rem;
  font-weight: 700;
}

.track-pill:hover,
.track-pill:focus-visible {
  transform: translate(-2px, -2px);
  box-shadow: 7px 7px 0 var(--shadow-color);
}

.track-pill:focus-visible {
  outline: 3px dashed var(--ink);
  outline-offset: 3px;
}

.track-pill.is-active {
  background: var(--course-accent);
}

.demo-shell {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.demo-page .course-cta {
  margin-top: 0.5rem;
}

.demo-title {
  margin-top: 0.7rem;
  margin-bottom: 0.45rem;
}

.demo-board {
  position: relative;
  border: var(--border);
  box-shadow: var(--shadow);
  background: var(--surface);
  padding: 1rem;
}

.demo-board::before,
.demo-board::after {
  content: "";
  position: absolute;
  border: var(--border);
  box-shadow: var(--shadow-sm);
  z-index: 0;
}

.demo-board::before {
  width: 48px;
  height: 48px;
  right: 16px;
  top: 16px;
  background: var(--course-accent);
  transform: rotate(8deg);
}

.demo-board::after {
  width: 24px;
  height: 24px;
  right: 56px;
  top: 72px;
  background: var(--course-accent-2);
}

.demo-board > * {
  position: relative;
  z-index: 1;
}

.mission-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.6rem;
}

.mission-level {
  margin: 0;
  border: var(--border);
  box-shadow: var(--shadow-sm);
  background: var(--course-accent-soft);
  font-size: 0.8rem;
  font-weight: 700;
  padding: 0.2rem 0.5rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.demo-chip-row {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
  margin-bottom: 0.8rem;
}

.demo-chip {
  border: var(--border);
  box-shadow: var(--shadow-sm);
  background: var(--course-accent-soft);
  padding: 0.25rem 0.58rem;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.mission-progress {
  border: var(--border);
  box-shadow: var(--shadow-sm);
  background: var(--surface-alt);
  padding: 0.55rem 0.65rem;
  margin-bottom: 0.8rem;
}

.mission-progress p {
  margin: 0;
}

.challenge-card {
  border: var(--border);
  box-shadow: var(--shadow);
  background: var(--surface-alt);
  padding: 0.9rem;
}

.demo-content-stack {
  display: grid;
  gap: 0.75rem;
}


.inline-score-card {
  margin-bottom: 0.7rem;
  background: var(--surface);
}

.challenge-question {
  font-size: clamp(1.35rem, 3.1vw, 2.2rem);
  margin: 0.35rem 0 0.2rem;
}

.challenge-context {
  font-size: 1rem;
  max-width: 60ch;
}

.choice-grid {
  margin-top: 0.7rem;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.6rem;
}

.choice-btn {
  border: var(--border);
  box-shadow: var(--shadow-sm);
  background: var(--surface);
  color: var(--ink);
  font-family: "Space Grotesk", sans-serif;
  font-size: 1rem;
  font-weight: 700;
  padding: 0.7rem;
  cursor: pointer;
  transition: transform 0.14s ease, box-shadow 0.14s ease;
}

.choice-btn[disabled] {
  opacity: 1;
}

.choice-btn:hover,
.choice-btn:focus-visible,
.choice-btn.is-selected {
  transform: translate(-2px, -2px);
  box-shadow: 7px 7px 0 var(--shadow-color);
}

.choice-btn.is-selected {
  background: var(--course-accent);
}

.choice-btn[data-state="correct"] {
  background: var(--course-accent-2);
}

.choice-btn[data-state="wrong"] {
  background: var(--surface-orange);
}

.choice-btn[data-state="neutral"] {
  opacity: 0.72;
}

.choice-btn:focus-visible {
  outline: 3px dashed var(--ink);
  outline-offset: 2px;
}

.demo-actions {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.action-card {
  background: var(--surface);
}

.feedback-card {
  border: var(--border);
  box-shadow: var(--shadow-sm);
  background: var(--surface);
  padding: 0.65rem;
  min-height: 80px;
}

.feedback-card[data-state="correct"] {
  background: var(--course-accent-2);
}

.feedback-card[data-state="wrong"] {
  background: var(--surface-orange);
}

.hint-card {
  border: var(--border);
  box-shadow: var(--shadow-sm);
  background: var(--course-accent-soft);
  padding: 0.65rem;
}

.completion-burst {
  border: var(--border);
  box-shadow: var(--shadow);
  background: var(--course-accent);
  padding: 0.6rem;
  font-family: "Archivo Black", sans-serif;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.hidden {
  display: none;
}

.status-card {
  border: var(--border);
  box-shadow: var(--shadow-sm);
  background: var(--surface);
  padding: 0.8rem;
}

.status-card h3 {
  font-size: 1rem;
  margin-bottom: 0.3rem;
}

.status-card p {
  margin: 0.25rem 0;
}

.progress-track {
  height: 16px;
  border: var(--border);
  background: var(--surface-alt);
  margin-top: 0.45rem;
}

.progress-fill {
  display: block;
  height: 100%;
  width: 0;
  background: repeating-linear-gradient(
    45deg,
    var(--progress-a),
    var(--progress-a) 10px,
    var(--progress-b) 10px,
    var(--progress-b) 20px
  );
}

.demo-cta {
  transition: opacity 0.2s ease;
}

.demo-cta.is-dim {
  opacity: 0.65;
}

.split {
  display: grid;
  gap: 1rem;
  grid-template-columns: 1fr 1fr;
}

.steps {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 0.7rem;
}

.steps li {
  border: var(--border);
  box-shadow: var(--shadow-sm);
  background: var(--surface);
  padding: 0.8rem;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.75rem;
  align-items: start;
}

.steps span {
  border: var(--border);
  box-shadow: var(--shadow-sm);
  background: var(--yellow);
  min-width: 40px;
  min-height: 40px;
  display: grid;
  place-items: center;
  font-weight: 700;
}

.metrics-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.8rem;
}

.metric-card {
  border: var(--border);
  box-shadow: var(--shadow-sm);
  background: var(--surface);
  padding: 1rem;
}

.metric-card h3 {
  font-size: clamp(1.8rem, 4.2vw, 3rem);
  margin-bottom: 0.15rem;
}

.testimonial-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.8rem;
}

blockquote {
  margin: 0;
  border: var(--border);
  box-shadow: var(--shadow-sm);
  background: var(--surface);
  padding: 1rem;
  font-weight: 500;
}

blockquote:nth-child(2) {
  background: var(--surface-quote);
}

blockquote cite {
  display: block;
  margin-top: 0.8rem;
  font-style: normal;
  font-size: 0.9rem;
  font-weight: 700;
}

.cta {
  text-align: center;
  background: linear-gradient(180deg, var(--cta-grad-a) 0%, var(--cta-grad-b) 100%);
}

.cta p {
  max-width: 52ch;
  margin-inline: auto;
}

.cta .hero-actions {
  justify-content: center;
}

.footer {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  justify-content: space-between;
  padding: 0.4rem 0.2rem 1rem;
  font-weight: 700;
}

.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.48s ease, transform 0.48s ease;
}

.reveal.show {
  opacity: 1;
  transform: translateY(0);
}

[data-stagger] > * {
  opacity: 0;
  transform: translateY(12px);
  animation: rise 0.5s ease forwards;
}

[data-stagger] > *:nth-child(1) {
  animation-delay: 0.05s;
}

[data-stagger] > *:nth-child(2) {
  animation-delay: 0.12s;
}

[data-stagger] > *:nth-child(3) {
  animation-delay: 0.19s;
}

[data-stagger] > *:nth-child(4) {
  animation-delay: 0.26s;
}

[data-stagger] > *:nth-child(5) {
  animation-delay: 0.33s;
}

@keyframes rise {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 980px) {
  .hero,
  .split,
  .demo-shell {
    grid-template-columns: 1fr;
  }

  .course-grid,
  .metrics-grid,
  .testimonial-grid,
  .learn-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 700px) {
  body {
    padding: 0.75rem;
  }

  .topbar,
  .section {
    padding: 1rem;
  }

  .navlinks {
    width: 100%;
    order: 3;
  }

  .topbar-actions {
    width: 100%;
  }

  .course-grid,
  .metrics-grid,
  .testimonial-grid,
  .board-row,
  .choice-grid,
  .learn-grid {
    grid-template-columns: 1fr;
  }

  .how-visual {
    grid-template-columns: 1fr;
    gap: 0.45rem;
  }

  .how-arrow {
    transform: rotate(90deg);
    justify-self: start;
    margin-left: 0.2rem;
  }

  .button,
  .theme-toggle {
    width: 100%;
    text-align: center;
  }

  .track-pill {
    width: 100%;
    text-align: center;
  }

  .hero-actions {
    width: 100%;
  }
}