:root {
  --bg: #08111f;
  --bg-soft: #0e1b2f;
  --panel: #13243b;
  --panel-strong: #172c49;
  --panel-soft: rgba(19, 36, 59, 0.72);
  --text: #f4f8ff;
  --muted: #a9b8cf;
  --line: rgba(244, 248, 255, 0.14);
  --brand: #38d9a9;
  --brand-2: #6ea8fe;
  --warning: #ffd166;
  --danger: #ff6b6b;
  --shadow: 0 24px 70px rgba(0, 0, 0, 0.28);
  --radius: 24px;
  --max: 1120px;
  color-scheme: dark;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 18% 0%, rgba(56, 217, 169, 0.16), transparent 30rem),
    radial-gradient(circle at 88% 8%, rgba(110, 168, 254, 0.18), transparent 34rem),
    linear-gradient(180deg, var(--bg) 0%, var(--bg-soft) 54%, #07101c 100%);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(244,248,255,0.032) 1px, transparent 1px),
    linear-gradient(90deg, rgba(244,248,255,0.032) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: linear-gradient(to bottom, rgba(0,0,0,0.85), transparent 74%);
}

a { color: inherit; }

.skip-link {
  position: absolute;
  left: 1rem;
  top: -4rem;
  z-index: 100;
  padding: 0.7rem 1rem;
  border-radius: 999px;
  background: var(--brand);
  color: #06100d;
  transition: top 160ms ease;
}
.skip-link:focus { top: 1rem; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(8, 17, 31, 0.84);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--line);
}

.nav {
  width: min(var(--max), calc(100% - 2rem));
  min-height: 72px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  font-weight: 850;
  letter-spacing: -0.035em;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border: 1px solid rgba(56, 217, 169, 0.35);
  border-radius: 14px;
  color: var(--brand);
  background: rgba(56, 217, 169, 0.08);
  box-shadow: inset 0 0 20px rgba(56, 217, 169, 0.10);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1rem;
  color: var(--muted);
  font-size: 0.96rem;
}

.nav-links a:not(.button) { text-decoration: none; }
.nav-links a:not(.button):hover,
.nav-links a:not(.button):focus-visible,
.nav-links a[aria-current="page"] { color: var(--text); }

.nav-toggle {
  display: none;
  min-height: 42px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--text);
  background: rgba(244,248,255,0.07);
  padding: 0.65rem 0.9rem;
}

.section-shell {
  width: min(var(--max), calc(100% - 2rem));
  margin-inline: auto;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(300px, 0.95fr);
  gap: clamp(1.25rem, 4vw, 3rem);
  align-items: center;
  min-height: calc(92vh - 72px);
  padding-block: clamp(4rem, 8vw, 6.5rem);
}

.hero-copy {
  max-width: 780px;
}

.eyebrow {
  margin: 0 0 0.9rem;
  color: var(--brand);
  font-size: 0.76rem;
  font-weight: 900;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

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

h1 {
  margin-bottom: 1.15rem;
  max-width: 900px;
  font-size: clamp(2.75rem, 7vw, 5.9rem);
  line-height: 0.94;
  letter-spacing: -0.075em;
}

h2 {
  margin-bottom: 0.9rem;
  font-size: clamp(1.85rem, 4vw, 3.45rem);
  line-height: 1;
  letter-spacing: -0.058em;
}

h3 {
  margin-bottom: 0.45rem;
  font-size: 1.18rem;
  letter-spacing: -0.025em;
}

.lede, .section-intro {
  color: var(--muted);
  font-size: clamp(1.02rem, 2vw, 1.22rem);
  line-height: 1.68;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: 2rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 48px;
  padding: 0.78rem 1.15rem;
  border: 1px solid rgba(56, 217, 169, 0.45);
  border-radius: 999px;
  background: linear-gradient(135deg, var(--brand), #aef5dc);
  color: #06100d;
  font-weight: 900;
  text-decoration: none;
  box-shadow: 0 14px 38px rgba(56, 217, 169, 0.16);
  transition: transform 160ms ease, border-color 160ms ease, background 160ms ease;
}

.button:hover,
.button:focus-visible { transform: translateY(-1px); }

.button.ghost {
  color: var(--text);
  background: rgba(244, 248, 255, 0.07);
  border-color: var(--line);
  box-shadow: none;
}

.button.small {
  min-height: 38px;
  padding: 0.45rem 0.85rem;
  font-size: 0.88rem;
}

.terminal-card,
.feature-card,
.update-card,
.timeline article,
.game-preview,
.game-list-card,
.future-games-panel {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(23, 44, 73, 0.88), rgba(19, 36, 59, 0.76));
  box-shadow: var(--shadow);
}

.terminal-card {
  overflow: hidden;
  transform: none;
  justify-self: stretch;
}

.terminal-top {
  display: flex;
  gap: 0.45rem;
  padding: 1rem;
  border-bottom: 1px solid var(--line);
  background: rgba(8, 17, 31, 0.36);
}

.terminal-top span {
  width: 12px;
  height: 12px;
  border-radius: 999px;
  background: var(--brand);
  opacity: 0.92;
}
.terminal-top span:nth-child(2) { background: var(--warning); }
.terminal-top span:nth-child(3) { background: var(--brand-2); }

pre {
  margin: 0;
  padding: clamp(1rem, 4vw, 2rem);
  overflow-x: auto;
  color: #dffdee;
  font-size: clamp(0.9rem, 2vw, 1.05rem);
  line-height: 1.65;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 1rem;
  padding-block: 1rem 5rem;
}

.feature-card,
.update-card,
.timeline article,
.game-list-card {
  padding: 1.25rem;
}

.feature-card p,
.update-card p,
.timeline p,
.site-footer p,
.game-list-card p,
.future-games-panel p {
  color: var(--muted);
  line-height: 1.65;
}

.feature-icon {
  display: inline-flex;
  margin-bottom: 1.35rem;
  color: var(--brand);
  font-weight: 950;
  letter-spacing: 0.08em;
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  gap: clamp(1.25rem, 4vw, 3rem);
  align-items: start;
  padding-block: 5rem;
}

.split.reverse {
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  align-items: center;
}

.updates-list {
  display: grid;
  gap: 1rem;
}

.update-card {
  box-shadow: 0 16px 45px rgba(0,0,0,0.18);
}

.update-card time {
  color: var(--brand);
  font-weight: 900;
  font-size: 0.88rem;
}

.update-card h3 { margin-top: 0.45rem; }

.update-card .tag,
.game-list-card .tag {
  display: inline-flex;
  width: fit-content;
  border: 1px solid rgba(56, 217, 169, 0.28);
  border-radius: 999px;
  padding: 0.25rem 0.6rem;
  color: var(--brand);
  background: rgba(56, 217, 169, 0.07);
  font-size: 0.78rem;
  font-weight: 850;
}

.skeleton {
  min-height: 100px;
  display: grid;
  place-items: center;
  color: var(--muted);
}

.game-preview {
  min-height: 360px;
  display: grid;
  place-items: center;
  text-align: center;
  overflow: hidden;
  position: relative;
  background:
    radial-gradient(circle at 50% 50%, rgba(56,217,169,0.17), transparent 15rem),
    linear-gradient(180deg, rgba(23, 44, 73, 0.92), rgba(19, 36, 59, 0.72));
}

.game-preview::before {
  content: "";
  position: absolute;
  width: min(380px, 76%);
  aspect-ratio: 1;
  border-radius: 50%;
  border: 1px solid rgba(56,217,169,0.25);
  background: radial-gradient(circle, rgba(110,168,254,0.16), transparent 62%);
}

.game-preview p {
  position: relative;
  color: var(--text);
  font-weight: 950;
  font-size: clamp(2rem, 4vw, 3.6rem);
  letter-spacing: -0.068em;
  max-width: 500px;
  margin: 0;
}

.orbital {
  position: absolute;
  width: 240px;
  height: 240px;
  border: 1px solid rgba(56,217,169,0.30);
  border-radius: 50%;
  animation: spin 18s linear infinite;
}

.orbital span {
  position: absolute;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--brand);
  box-shadow: 0 0 34px rgba(56,217,169,0.55);
}
.orbital span:nth-child(1) { top: -14px; left: calc(50% - 14px); }
.orbital span:nth-child(2) { right: 18px; bottom: 26px; background: var(--brand-2); }
.orbital span:nth-child(3) { left: 10px; bottom: 42px; background: var(--warning); }
@keyframes spin { to { transform: rotate(360deg); } }

.learning { padding-block: 5rem 7rem; }

.timeline {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-top: 1.4rem;
}

.site-footer {
  border-top: 1px solid var(--line);
  background: rgba(8, 17, 31, 0.64);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-block: 2rem;
  flex-wrap: wrap;
}
.footer-inner p { margin-bottom: 0; }

.footer-links {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 0.9rem;
  flex-wrap: wrap;
}

.footer-links a {
  color: var(--muted);
  text-decoration: none;
}

.footer-links a:hover,
.footer-links a:focus-visible {
  color: var(--text);
  text-decoration: underline;
  text-underline-offset: 0.22em;
}

.prose-page {
  max-width: 860px;
  padding-block: 4rem 6rem;
}

.prose-page h1 { margin-bottom: 1rem; }
.prose-page h2 { margin-top: 2.5rem; }
.prose-page ul { color: var(--muted); }
.prose-page li + li { margin-top: 0.65rem; }
.prose-page a { color: var(--accent-2); }

.page-hero {
  padding-block: 5rem 3rem;
}
.page-hero h1 { max-width: 980px; }

.section-heading-row {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 1.5rem;
  margin-bottom: 1.25rem;
}
.section-intro.compact {
  max-width: 520px;
  font-size: 1rem;
}

.games-directory,
.future-games-panel { padding-block: 3rem; }

.games-list {
  display: grid;
  gap: 1rem;
}

.game-list-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 1rem;
}

.game-list-card .tag {
  margin-bottom: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.game-inspiration { margin-bottom: 0; }

.future-games-panel {
  margin-bottom: 4rem;
  padding-inline: clamp(1.2rem, 3vw, 2rem);
}

code {
  color: #dffdee;
  background: rgba(244,248,255,0.08);
  border: 1px solid rgba(244,248,255,0.08);
  border-radius: 0.4rem;
  padding: 0.08rem 0.28rem;
}



/* Read Code Lab */
.read-code-hero {
  padding-bottom: 2rem;
}

.review-intro {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(280px, 0.75fr);
  gap: 1rem;
  padding-block: 1rem 3rem;
}

.review-brief,
.task-card,
.next-lab-panel,
.review-answer-example,
.read-code-preview {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(23, 44, 73, 0.88), rgba(19, 36, 59, 0.76));
  box-shadow: var(--shadow);
}

.review-brief,
.task-card,
.next-lab-panel,
.read-code-preview {
  padding: clamp(1.1rem, 3vw, 2rem);
}

.compact-brief p,
.task-card p,
.task-card li,
.review-step p,
.review-step li,
.next-lab-panel p {
  color: var(--muted);
  line-height: 1.65;
}

.task-card { margin-block: 1rem 4rem; }

.task-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 1.2rem;
}

.task-grid article {
  padding: 1.1rem;
  border: 1px solid var(--line);
  border-radius: calc(var(--radius) - 6px);
  background: rgba(8, 17, 31, 0.34);
}

.clean-list {
  margin: 0;
  padding-left: 1.2rem;
}

.diff-section { padding-block: 1rem 4rem; }

.diff-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 1rem;
  color: var(--muted);
  font-size: 0.92rem;
}

.diff-toolbar span {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.45rem 0.65rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(244, 248, 255, 0.045);
}

.dot {
  width: 0.68rem;
  height: 0.68rem;
  border-radius: 50%;
}
.add-dot { background: var(--brand); }
.remove-dot { background: var(--danger); }
.note-dot { background: var(--brand-2); }

.diff-view {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #07101c;
  box-shadow: var(--shadow);
  overflow: auto;
  max-height: 74vh;
  padding: 0;
  font-size: clamp(0.78rem, 1.4vw, 0.94rem);
  line-height: 1.55;
}

.diff-view code {
  display: block;
  min-width: 880px;
  padding: 1rem 0;
  color: #dffdee;
  background: transparent;
  border: 0;
}

.diff-file,
.diff-hunk,
.diff-line {
  display: block;
  white-space: pre;
}

.diff-file {
  padding: 0.35rem 1rem;
  color: var(--brand);
  font-weight: 900;
}

.diff-hunk {
  padding: 0.35rem 1rem;
  color: var(--brand-2);
  background: rgba(110, 168, 254, 0.08);
}

.diff-line {
  display: grid;
  grid-template-columns: 3.4rem minmax(0, 1fr);
  transition: background 160ms ease, box-shadow 160ms ease;
}

.line-no {
  user-select: none;
  color: rgba(244, 248, 255, 0.40);
  text-align: right;
  padding-right: 0.9rem;
  border-right: 1px solid rgba(244, 248, 255, 0.08);
}

.line-code { padding-left: 0.85rem; }
.diff-line.add { background: rgba(56, 217, 169, 0.08); }
.diff-line.remove { background: rgba(255, 107, 107, 0.08); color: #ffd5d5; }
.diff-line.is-question-target {
  background: rgba(110, 168, 254, 0.18);
  box-shadow: inset 4px 0 0 var(--brand-2);
}

.review-walkthrough {
  display: grid;
  grid-template-columns: minmax(250px, 0.36fr) minmax(0, 0.64fr);
  gap: clamp(1.25rem, 4vw, 2.5rem);
  align-items: start;
  padding-block: 2rem 5rem;
}

.question-rail {
  position: sticky;
  top: 96px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(8, 17, 31, 0.74);
  box-shadow: var(--shadow);
  padding: 1.2rem;
}

.question-rail ol {
  display: grid;
  gap: 0.5rem;
  list-style: none;
  margin: 1rem 0 0;
  padding: 0;
}

.question-rail li {
  cursor: pointer;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.62rem 0.8rem;
  color: var(--muted);
  background: rgba(244, 248, 255, 0.045);
  transition: background 160ms ease, color 160ms ease, transform 160ms ease;
}

.question-rail li:hover,
.question-rail li:focus-visible,
.question-rail li.is-active {
  color: var(--text);
  background: rgba(56, 217, 169, 0.12);
  border-color: rgba(56, 217, 169, 0.30);
  transform: translateX(2px);
}

.review-steps {
  display: grid;
  gap: 1.25rem;
}

.review-step {
  scroll-margin-top: 96px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(23, 44, 73, 0.84), rgba(19, 36, 59, 0.70));
  box-shadow: 0 16px 45px rgba(0,0,0,0.18);
  padding: clamp(1.1rem, 3vw, 1.75rem);
}

.review-step details {
  margin-block: 1rem;
  border: 1px solid var(--line);
  border-radius: calc(var(--radius) - 8px);
  background: rgba(8, 17, 31, 0.36);
  padding: 0.8rem 1rem;
}

.review-step summary {
  cursor: pointer;
  color: var(--brand);
  font-weight: 900;
}

.review-step label {
  display: grid;
  gap: 0.5rem;
  color: var(--text);
  font-weight: 850;
}

.review-step textarea {
  min-height: 8rem;
  resize: vertical;
  width: 100%;
  border: 1px solid var(--line);
  border-radius: calc(var(--radius) - 10px);
  color: var(--text);
  background: rgba(8, 17, 31, 0.56);
  padding: 0.9rem;
  font: inherit;
  line-height: 1.5;
}

.review-step textarea:focus-visible {
  outline: 3px solid rgba(56, 217, 169, 0.26);
  border-color: rgba(56, 217, 169, 0.52);
}

.review-answer-example {
  padding: 1rem;
  margin-block: 1rem;
  background: rgba(56, 217, 169, 0.08);
}

.review-answer-example h4 {
  margin: 0 0 0.55rem;
}

.read-code-preview {
  display: grid;
  gap: 0.75rem;
  min-height: 300px;
  align-content: center;
}

.preview-diff-line {
  display: grid;
  grid-template-columns: 2rem 1fr;
  gap: 0.75rem;
  border: 1px solid var(--line);
  border-radius: 0.75rem;
  padding: 0.55rem 0.7rem;
  background: rgba(8, 17, 31, 0.42);
  color: var(--muted);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  font-size: 0.9rem;
}

.preview-diff-line.add { color: #dffdee; background: rgba(56, 217, 169, 0.08); }
.preview-diff-line.remove { color: #ffd5d5; background: rgba(255, 107, 107, 0.08); }

.next-lab-panel { margin-bottom: 5rem; }

@media (max-width: 860px) {
  .nav { align-items: center; padding-block: 1rem; }
  .nav-toggle { display: inline-flex; }
  .nav-links {
    position: absolute;
    top: 72px;
    left: 1rem;
    right: 1rem;
    display: none;
    flex-direction: column;
    align-items: stretch;
    padding: 1rem;
    border: 1px solid var(--line);
    border-radius: 20px;
    background: rgba(8, 17, 31, 0.96);
    box-shadow: var(--shadow);
  }
  .nav-links[data-open="true"] { display: flex; }
  .hero,
  .review-intro,
  .task-grid,
  .review-walkthrough,
  .split,
  .split.reverse,
  .feature-grid,
  .timeline {
    grid-template-columns: 1fr;
  }
  .hero { min-height: auto; padding-block: 4rem; }
  .section-heading-row,
  .game-list-card {
    display: grid;
    grid-template-columns: 1fr;
    align-items: stretch;
  }
  .game-list-card .button { width: 100%; }
  .question-rail { position: static; }
  .footer-inner { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 560px) {
  .section-shell { width: min(var(--max), calc(100% - 1rem)); }
  .nav { width: min(var(--max), calc(100% - 1rem)); }
  h1 { font-size: clamp(2.45rem, 14vw, 4.1rem); }
  h2 { font-size: clamp(1.7rem, 10vw, 2.6rem); }
  .hero { padding-block: 3rem; }
  .button { width: 100%; }
  .nav-links .button { width: 100%; }
  .feature-card,
  .update-card,
  .timeline article,
  .game-list-card { padding: 1rem; }
  .game-preview { min-height: 280px; }
}

/* Weekly content: Read Code Labs and Last Week Recaps */
.weekly-principles {
  margin-block: 1rem 3rem;
}

.checklist-grid article {
  min-height: 170px;
}

.lab-list-card time,
.recap-list-card time {
  color: var(--brand);
  font-weight: 900;
  font-size: 0.88rem;
}

.homepage-recap-list .game-list-card,
.recap-list .game-list-card,
.lab-list .game-list-card {
  min-height: 160px;
}

.recap-hero h1 {
  max-width: 1050px;
}

.recap-summary-panel,
.recap-item {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(23, 44, 73, 0.88), rgba(19, 36, 59, 0.76));
  box-shadow: var(--shadow);
}

.recap-summary-panel {
  padding: clamp(1.2rem, 3vw, 2rem);
  margin-block: 1rem 3rem;
}

.recap-list-section {
  padding-block: 2rem 4rem;
}

.recap-items {
  display: grid;
  gap: 1rem;
  margin-top: 1.3rem;
}

.recap-item {
  display: grid;
  grid-template-columns: 4rem minmax(0, 1fr);
  gap: 1rem;
  padding: clamp(1rem, 3vw, 1.35rem);
}

.recap-rank {
  display: grid;
  place-items: center;
  width: 3rem;
  height: 3rem;
  border-radius: 1rem;
  color: #06100d;
  background: linear-gradient(135deg, var(--brand), #aef5dc);
  font-weight: 950;
  font-size: 1.1rem;
}

.recap-item h3 {
  margin-bottom: 0.55rem;
  font-size: clamp(1.1rem, 2vw, 1.35rem);
}

.recap-item p {
  color: var(--muted);
  line-height: 1.65;
}

.recap-source {
  margin-bottom: 0;
  color: var(--text) !important;
}

.recap-source strong {
  color: var(--brand);
}

@media (max-width: 560px) {
  .recap-item {
    grid-template-columns: 1fr;
  }
  .recap-rank {
    width: 2.5rem;
    height: 2.5rem;
  }
}