:root {
  --bg: #06142a;
  --bg-soft: #0f2142;
  --panel: rgba(12, 28, 56, 0.88);
  --panel-strong: rgba(18, 37, 72, 0.96);
  --ink: #f8f6ef;
  --muted: #c3d1ea;
  --accent: #ffd45b;
  --accent-2: #7fd6ff;
  --accent-3: #ff8d6d;
  --border: rgba(255, 255, 255, 0.12);
  --shadow: 0 18px 40px rgba(2, 8, 18, 0.35);
  --radius-xl: 28px;
  --radius-lg: 22px;
  --radius-md: 16px;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --hero: clamp(2.8rem, 6vw, 5.2rem);
  --h2: clamp(2rem, 4vw, 3rem);
  --font-head: ui-rounded, "Avenir Next Rounded", "Trebuchet MS", "Gill Sans", sans-serif;
  --font-body: "Avenir Next", "Segoe UI", "Helvetica Neue", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-body);
  color: var(--ink);
  line-height: 1.65;
  background:
    radial-gradient(circle at top left, rgba(127, 214, 255, 0.12), transparent 28%),
    radial-gradient(circle at top right, rgba(255, 212, 91, 0.12), transparent 22%),
    linear-gradient(180deg, #07111f 0%, #0a1c34 42%, #07111f 100%);
}

.stars {
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.55;
  background-image:
    radial-gradient(circle at 10% 14%, rgba(255,255,255,0.9) 0 1.5px, transparent 1.6px),
    radial-gradient(circle at 24% 38%, rgba(255,255,255,0.7) 0 1.2px, transparent 1.3px),
    radial-gradient(circle at 44% 22%, rgba(255,255,255,0.8) 0 1.8px, transparent 1.9px),
    radial-gradient(circle at 58% 12%, rgba(255,255,255,0.55) 0 1.4px, transparent 1.5px),
    radial-gradient(circle at 72% 33%, rgba(255,255,255,0.72) 0 1.4px, transparent 1.5px),
    radial-gradient(circle at 84% 18%, rgba(255,255,255,0.85) 0 1.2px, transparent 1.3px),
    radial-gradient(circle at 18% 72%, rgba(255,255,255,0.65) 0 1.5px, transparent 1.6px),
    radial-gradient(circle at 37% 80%, rgba(255,255,255,0.8) 0 1.3px, transparent 1.4px),
    radial-gradient(circle at 64% 70%, rgba(255,255,255,0.7) 0 1.5px, transparent 1.6px),
    radial-gradient(circle at 88% 76%, rgba(255,255,255,0.8) 0 1.8px, transparent 1.9px);
}

a {
  color: inherit;
}

button,
input {
  font: inherit;
}

canvas {
  display: block;
  max-width: 100%;
}

.page {
  position: relative;
  max-width: 1180px;
  margin: 0 auto;
  padding: var(--space-8) var(--space-5) var(--space-12);
}

.card {
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--panel);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.back-link,
.kicker,
.caption,
.section__lede,
.phase-card span,
.lesson-card p,
.moon-explainer__detail,
.quiz-feedback,
.hero__phase-copy,
.orbit-note,
.takeaway-item span,
#shadowCopy {
  color: var(--muted);
}

.back-link {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
  font-size: 0.95rem;
  margin-bottom: var(--space-6);
}

.hero {
  display: grid;
  gap: var(--space-6);
}

.hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(300px, 0.8fr);
  gap: var(--space-8);
  align-items: center;
}

.hero__copy {
  display: grid;
  gap: var(--space-5);
}

.kicker {
  margin: 0;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.18em;
}

h1,
h2,
h3,
.phase-card strong,
.hero__phase-label,
.quiz-score,
.phase-pill {
  font-family: var(--font-head);
  letter-spacing: -0.03em;
}

h1 {
  margin: 0;
  font-size: var(--hero);
  line-height: 0.95;
  max-width: 11ch;
}

h2 {
  margin: 0;
  font-size: var(--h2);
  line-height: 1.02;
}

h3 {
  margin: 0 0 0.45rem;
  font-size: 1.35rem;
}

.lead,
.section__lede,
.moon-explainer__main,
.quiz-question {
  font-size: 1.12rem;
}

.fact-row,
.hero__actions,
.control-row,
.toggle-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
}

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

.fact-pill {
  display: grid;
  gap: 0.35rem;
  padding: var(--space-4);
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.06);
}

.fact-pill strong {
  color: var(--accent);
}

.fact-pill span {
  color: var(--muted);
  font-size: 0.98rem;
}

.primary-link,
.ghost-link,
.control-button,
.toggle-button,
.phase-card,
.quiz-option {
  border-radius: 999px;
  border: 1px solid transparent;
  transition: transform 160ms ease, border-color 160ms ease, background 160ms ease, color 160ms ease;
}

.primary-link,
.ghost-link,
.control-button,
.primary-link--button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  padding: 0.8rem 1.1rem;
  cursor: pointer;
}

.primary-link,
.control-button,
.primary-link--button {
  background: linear-gradient(135deg, var(--accent), #ffb65d);
  color: #0b1630;
  font-weight: 700;
}

.ghost-link,
.toggle-button,
.quiz-option {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.12);
  color: var(--ink);
}

.primary-link:hover,
.ghost-link:hover,
.control-button:hover,
.toggle-button:hover,
.phase-card:hover,
.quiz-option:hover,
.primary-link:focus-visible,
.ghost-link:focus-visible,
.control-button:focus-visible,
.toggle-button:focus-visible,
.phase-card:focus-visible,
.quiz-option:focus-visible {
  transform: translateY(-1px);
  outline: none;
}

.hero__visual {
  padding: var(--space-6);
  display: grid;
  justify-items: center;
  gap: var(--space-3);
  background: radial-gradient(circle at top, rgba(255, 212, 91, 0.14), rgba(12, 28, 56, 0.95));
}

.hero__phase-label {
  margin: 0;
  font-size: 1.8rem;
}

.hero__phase-copy {
  margin: 0;
  text-align: center;
  max-width: 26rem;
}

.section {
  display: grid;
  gap: var(--space-6);
  margin-top: var(--space-12);
}

.section__head {
  display: flex;
  justify-content: space-between;
  gap: var(--space-6);
  align-items: end;
}

.section__lede {
  max-width: 28rem;
  margin: 0;
}

.explorer-grid,
.shadow-grid {
  display: grid;
  grid-template-columns: minmax(280px, 0.45fr) minmax(0, 1fr);
  gap: var(--space-6);
  align-items: start;
}

.story-card,
.canvas-card,
.game-card,
.takeaway-list {
  padding: var(--space-5);
}

.kid-steps {
  margin: 0 0 var(--space-4);
  padding-left: 1.3rem;
}

.slider-wrap {
  display: grid;
  gap: 0.45rem;
  min-width: min(24rem, 100%);
  flex: 1;
}

.slider-wrap span {
  font-weight: 700;
}

input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
}

.visual-stack {
  display: grid;
  gap: var(--space-5);
}

.canvas-card h3,
.story-card h3,
.lesson-card h3 {
  color: var(--ink);
}

.canvas-card {
  background: var(--panel-strong);
}

.canvas-card--moon-view {
  background: linear-gradient(180deg, rgba(17, 37, 73, 0.98), rgba(12, 24, 48, 0.98));
}

.moon-view__head {
  display: flex;
  justify-content: space-between;
  gap: var(--space-4);
  align-items: start;
  margin-bottom: var(--space-4);
}

.moon-view__subtitle,
.quiz-score,
.quiz-question {
  margin: 0;
}

.phase-pill {
  display: inline-flex;
  align-items: center;
  padding: 0.55rem 0.85rem;
  border-radius: 999px;
  background: rgba(127, 214, 255, 0.12);
  color: var(--accent-2);
  font-size: 0.95rem;
}

.moon-view__body {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-5);
  align-items: center;
}

.moon-explainer {
  display: grid;
  gap: 0.6rem;
}

.moon-explainer__main,
.moon-explainer__detail,
.quiz-feedback,
.caption,
.orbit-note,
#shadowCopy {
  margin: 0;
}

.phase-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--space-4);
}

.phase-card {
  display: grid;
  justify-items: center;
  gap: 0.7rem;
  padding: var(--space-5);
  text-align: center;
  cursor: pointer;
  background: rgba(11, 26, 51, 0.92);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(255,255,255,0.12);
}

.phase-card strong {
  font-size: 1.05rem;
}

.phase-card.is-active {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(255, 212, 91, 0.24), var(--shadow);
}

.lesson-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-4);
}

.lesson-card {
  padding: var(--space-5);
}

.lesson-card--accent {
  background: rgba(255, 141, 109, 0.12);
  border-color: rgba(255, 141, 109, 0.3);
}

.lesson-card__example {
  color: var(--accent);
  font-weight: 700;
}

.toggle-row {
  margin-bottom: var(--space-4);
}

.toggle-button {
  padding: 0.7rem 1rem;
  cursor: pointer;
}

.toggle-button.is-active {
  background: rgba(255, 212, 91, 0.16);
  border-color: rgba(255, 212, 91, 0.4);
  color: var(--accent);
}

.game-card {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: var(--space-6);
  align-items: center;
}

.game-card__visual {
  display: grid;
  place-items: center;
}

.game-card__body {
  display: grid;
  gap: var(--space-4);
}

.quiz-options {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-3);
}

.quiz-option {
  padding: 0.85rem 1rem;
  text-align: center;
  cursor: pointer;
}

.quiz-option.is-right {
  background: rgba(127, 214, 255, 0.14);
  border-color: rgba(127, 214, 255, 0.4);
  color: var(--accent-2);
}

.quiz-option.is-wrong {
  background: rgba(255, 141, 109, 0.14);
  border-color: rgba(255, 141, 109, 0.4);
  color: #ffd8cf;
}

.takeaway-list {
  display: grid;
  gap: 0;
}

.takeaway-item {
  display: flex;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-5) 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.takeaway-item:last-child {
  border-bottom: 0;
}

.takeaway-item strong {
  font-family: var(--font-head);
  font-size: 1.15rem;
}

#orbitCanvas {
  cursor: grab;
}

#orbitCanvas.is-dragging {
  cursor: grabbing;
}

@media (max-width: 1024px) {
  .hero__grid,
  .explorer-grid,
  .shadow-grid,
  .game-card,
  .lesson-grid,
  .phase-grid,
  .fact-row {
    grid-template-columns: 1fr;
  }

  .moon-view__body {
    grid-template-columns: 1fr;
    justify-items: center;
    text-align: center;
  }

  .section__head,
  .moon-view__head,
  .takeaway-item {
    flex-direction: column;
    align-items: start;
  }
}

@media (max-width: 720px) {
  .page {
    padding-left: var(--space-4);
    padding-right: var(--space-4);
  }

  h1 {
    max-width: 12ch;
  }

  .quiz-options {
    grid-template-columns: 1fr;
  }

  .hero__actions,
  .control-row,
  .toggle-row {
    flex-direction: column;
    align-items: stretch;
  }

  .hero__visual,
  .story-card,
  .canvas-card,
  .game-card,
  .takeaway-list,
  .phase-card,
  .lesson-card {
    border-radius: 20px;
  }
}