/* The landing page. Both books bring their own stylesheet; this covers
   only the page they sit under.

   The palette is the logo's: the butterfly's four wing colours are the
   accents, and its body colour is the ink. Light sections carry the
   story, dark ones carry code and terminals, so anything that runs
   always looks like it runs. */

:root {
  color-scheme: light;

  --gold: #f99320;
  --red: #fd5625;
  --teal: #0c9d96;
  --purple: #744baa;

  --ink: #171a23;
  --ink-2: #353a48;
  --muted: #5b6070;
  --faint: #8a8e9e;
  --paper: #ffffff;
  --paper-2: #f7f6f2;
  --edge: #e5e2db;
  --edge-2: #d8d4cb;

  --night: #0d0f15;
  --night-2: #141720;
  --night-3: #1b1f2a;
  --night-edge: #272c39;
  --night-ink: #ebe8e2;
  --night-muted: #a0a5b3;

  --display: 'Bricolage Grotesque', ui-sans-serif, system-ui, -apple-system, 'Segoe UI', sans-serif;
  --body: 'Inter', ui-sans-serif, system-ui, -apple-system, 'Segoe UI', sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --wide: 78rem;
  --gut: clamp(1rem, 4vw, 3rem);

  --r-sm: 6px;
  --r-md: 10px;
  --r-lg: 16px;

  --lift: transform 160ms ease, box-shadow 160ms ease, border-color 160ms ease,
    background-color 160ms ease, color 160ms ease;
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;

    --ink: #eceae5;
    --ink-2: #cfccc5;
    --muted: #a2a6b4;
    --faint: #767b8b;
    --paper: #0f1118;
    --paper-2: #141720;
    --edge: #252a36;
    --edge-2: #303645;

    --night: #08090d;
    --night-2: #0f1117;
    --night-3: #161a23;
  }
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
  -webkit-text-size-adjust: 100%;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 1rem/1.65 var(--body);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img,
svg {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
}

code,
pre,
kbd {
  font-family: var(--mono);
  font-variant-ligatures: none;
}

:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
  border-radius: 4px;
}

.skip {
  position: absolute;
  left: -999px;
  top: 0.5rem;
  z-index: 100;
  padding: 0.5rem 0.9rem;
  border-radius: var(--r-sm);
  background: var(--ink);
  color: var(--paper);
}

.skip:focus {
  left: 0.5rem;
}

.wrap {
  width: 100%;
  max-width: var(--wide);
  margin: 0 auto;
  padding: 0 var(--gut);
}

/* Top bar */

.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid transparent;
  background: color-mix(in srgb, var(--paper) 82%, transparent);
  backdrop-filter: saturate(1.6) blur(14px);
  -webkit-backdrop-filter: saturate(1.6) blur(14px);
  transition: border-color 200ms ease;
}

.topbar.scrolled {
  border-bottom-color: var(--edge);
}

.topbar-inner {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  height: 4rem;
}

.wordmark {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  text-decoration: none;
  font: 800 1.3rem/1 var(--display);
  letter-spacing: -0.02em;
}

.topnav {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  margin-left: auto;
}

.topnav a {
  padding: 0.45rem 0.75rem;
  border-radius: var(--r-sm);
  color: var(--ink-2);
  font-size: 0.92rem;
  font-weight: 500;
  text-decoration: none;
  transition: var(--lift);
}

.topnav a:hover {
  background: var(--paper-2);
  color: var(--ink);
}

.topnav .nav-install {
  margin-left: 0.4rem;
  background: var(--ink);
  color: var(--paper);
}

.topnav .nav-install:hover {
  background: var(--ink-2);
  color: var(--paper);
}

@media (max-width: 760px) {
  .topnav .opt {
    display: none;
  }
}

/* Buttons */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.8rem 1.25rem;
  border: 1px solid var(--edge-2);
  border-radius: var(--r-md);
  background: var(--paper);
  color: var(--ink);
  font-weight: 600;
  font-size: 0.97rem;
  text-decoration: none;
  transition: var(--lift);
}

.btn:hover {
  transform: translateY(-1px);
  border-color: var(--ink-2);
}

.btn.primary {
  border-color: var(--ink);
  background: var(--ink);
  color: var(--paper);
}

.btn.primary:hover {
  box-shadow: 0 8px 24px -10px rgba(23, 26, 35, 0.6);
}

.btn .arrow {
  transition: transform 160ms ease;
}

.btn:hover .arrow {
  transform: translateX(3px);
}

/* Shared section furniture */

.section {
  padding: clamp(4rem, 7vw, 6rem) 0;
}

.section.alt {
  background: var(--paper-2);
}

.section.dark {
  background: var(--night);
  color: var(--night-ink);
}

.kicker {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  margin: 0 0 1rem;
  color: var(--muted);
  font: 600 0.78rem/1 var(--mono);
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.kicker::before {
  content: '';
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 2px;
  background: var(--accent, var(--gold));
}

.dark .kicker {
  color: var(--night-muted);
}

h1,
h2,
h3 {
  font-family: var(--display);
  letter-spacing: -0.025em;
  line-height: 1.05;
  margin: 0;
}

h2 {
  max-width: 22ch;
  font-size: clamp(2.1rem, 4.6vw, 3.6rem);
  font-weight: 800;
}

h3 {
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.25;
}

.intro {
  max-width: 44rem;
  margin: 1.25rem 0 0;
  color: var(--muted);
  font-size: clamp(1.05rem, 1.6vw, 1.2rem);
}

.dark .intro {
  color: var(--night-muted);
}

.intro code,
.card code,
.tick code,
.prose code,
.format code,
.ship-note code,
.panel-note code,
.install-note code {
  white-space: nowrap;
}

.intro code,
.card code,
.tick code,
.prose code {
  padding: 0.1em 0.35em;
  border-radius: 4px;
  background: color-mix(in srgb, var(--ink) 7%, transparent);
  font-size: 0.88em;
}

.dark .intro code,
.dark .prose code {
  background: rgba(255, 255, 255, 0.08);
}

.head {
  margin-bottom: clamp(2.25rem, 4vw, 3rem);
}

.head.center {
  text-align: center;
}

.head.center h2,
.head.center .intro {
  margin-left: auto;
  margin-right: auto;
}

.more {
  align-self: flex-start;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  color: var(--ink);
  font-weight: 600;
  font-size: 0.93rem;
  text-decoration: none;
  border-bottom: 1.5px solid var(--accent, var(--gold));
  padding-bottom: 1px;
}

.dark .more {
  color: var(--night-ink);
}

/* Hero */

.hero {
  position: relative;
  padding: clamp(3rem, 7vw, 5.5rem) 0 clamp(4rem, 8vw, 6.5rem);
  overflow: hidden;
  isolation: isolate;
}

.hero-glow {
  position: absolute;
  inset: -20% -10% auto;
  height: 120%;
  z-index: -1;
  background:
    radial-gradient(38rem 26rem at 8% 18%, color-mix(in srgb, var(--gold) 22%, transparent), transparent 70%),
    radial-gradient(34rem 26rem at 92% 12%, color-mix(in srgb, var(--purple) 20%, transparent), transparent 70%),
    radial-gradient(40rem 22rem at 70% 92%, color-mix(in srgb, var(--teal) 16%, transparent), transparent 70%);
  pointer-events: none;
}

.hero-glow::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, color-mix(in srgb, var(--ink) 6%, transparent) 1px, transparent 1px),
    linear-gradient(to bottom, color-mix(in srgb, var(--ink) 6%, transparent) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 35%, #000 20%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 35%, #000 20%, transparent 75%);
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.12fr) minmax(0, 1fr);
  gap: clamp(2rem, 4vw, 4rem);
  align-items: center;
}

@media (max-width: 1000px) {
  .hero-grid {
    grid-template-columns: minmax(0, 1fr);
  }
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  margin: 0 0 1.5rem;
  padding: 0.4rem 0.85rem 0.4rem 0.55rem;
  border: 1px solid var(--edge);
  border-radius: 999px;
  background: color-mix(in srgb, var(--paper) 70%, transparent);
  color: var(--ink-2);
  font-size: 0.86rem;
  font-weight: 500;
}

.badge img {
  width: 22px;
  height: auto;
}

.hero h1 {
  font-size: clamp(2.5rem, 4.7vw, 4.1rem);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.03em;
}

.hl {
  white-space: nowrap;
  background: linear-gradient(100deg, var(--gold) 0%, var(--red) 35%, var(--purple) 70%, var(--teal) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.lede {
  margin: 1.5rem 0 0;
  max-width: 34rem;
  color: var(--ink-2);
  font-size: clamp(1.15rem, 1.9vw, 1.35rem);
  font-weight: 500;
  line-height: 1.5;
}

.sublede {
  margin: 0.9rem 0 0;
  max-width: 35rem;
  color: var(--muted);
  font-size: 1.02rem;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.75rem;
}

/* Install box, in the hero and at the end */

.install {
  margin-top: 2rem;
  max-width: 38rem;
}

.tabs {
  display: flex;
  gap: 0.25rem;
  margin-bottom: 0.5rem;
}

.tab {
  padding: 0.35rem 0.75rem;
  border: 0;
  border-radius: var(--r-sm);
  background: transparent;
  color: var(--muted);
  font: 500 0.86rem/1.2 var(--body);
  cursor: pointer;
  transition: var(--lift);
}

.tab:hover {
  color: var(--ink);
}

.tab[aria-selected='true'] {
  background: color-mix(in srgb, var(--ink) 8%, transparent);
  color: var(--ink);
}

.dark .tab {
  color: var(--night-muted);
}

.dark .tab:hover,
.dark .tab[aria-selected='true'] {
  color: var(--night-ink);
}

.dark .tab[aria-selected='true'] {
  background: rgba(255, 255, 255, 0.08);
}

.cmd {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.85rem 0.6rem 0.85rem 1rem;
  border: 1px solid var(--night-edge);
  border-radius: var(--r-md);
  background: var(--night);
  color: var(--night-ink);
  box-shadow: 0 18px 40px -24px rgba(13, 15, 21, 0.55);
}

.cmd code {
  flex: 1;
  min-width: 0;
  overflow-x: auto;
  white-space: nowrap;
  font-size: 0.8rem;
  scrollbar-width: none;
}

.cmd code::-webkit-scrollbar {
  display: none;
}

.cmd .p {
  color: var(--teal);
  user-select: none;
}

.copy {
  flex: none;
  display: inline-grid;
  place-items: center;
  width: 2.2rem;
  height: 2.2rem;
  border: 1px solid var(--night-edge);
  border-radius: var(--r-sm);
  background: var(--night-3);
  color: var(--night-muted);
  cursor: pointer;
  transition: var(--lift);
}

.copy:hover {
  color: var(--night-ink);
  border-color: var(--night-muted);
}

.copy svg {
  width: 1rem;
  height: 1rem;
}

.copy .done {
  display: none;
}

.copy.copied .idle {
  display: none;
}

.copy.copied .done {
  display: block;
  color: var(--teal);
}

.install-note {
  margin: 0.6rem 0 0;
  color: var(--faint);
  font-size: 0.84rem;
}

.install-note a {
  color: var(--muted);
}

.dark .install-note,
.dark .install-note a {
  color: var(--night-muted);
}

[role='tabpanel'][hidden] {
  display: none;
}

/* Windows: terminal and code */

.window {
  position: relative;
  border: 1px solid var(--night-edge);
  border-radius: var(--r-lg);
  background: var(--night-2);
  color: var(--night-ink);
  box-shadow:
    0 40px 80px -40px rgba(13, 15, 21, 0.65),
    0 0 0 1px rgba(255, 255, 255, 0.03) inset;
  overflow: hidden;
}

.window-bar {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.7rem 1rem;
  border-bottom: 1px solid var(--night-edge);
  background: var(--night-3);
}

.dots {
  display: flex;
  gap: 0.4rem;
}

.dots i {
  width: 0.7rem;
  height: 0.7rem;
  border-radius: 50%;
  background: #3a3f4d;
}

.dots i:nth-child(1) {
  background: var(--red);
}

.dots i:nth-child(2) {
  background: var(--gold);
}

.dots i:nth-child(3) {
  background: var(--teal);
}

.window-title {
  color: var(--night-muted);
  font: 500 0.8rem/1 var(--mono);
}

.window pre {
  margin: 0;
  padding: 1.15rem 1.25rem 1.3rem;
  overflow-x: auto;
  font-size: 0.83rem;
  line-height: 1.65;
  tab-size: 2;
}

.window pre code {
  font-size: inherit;
}

.window pre.term {
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.window pre {
  scrollbar-width: thin;
  scrollbar-color: #3a4050 transparent;
}

.window pre::-webkit-scrollbar {
  height: 8px;
}

.window pre::-webkit-scrollbar-thumb {
  border-radius: 4px;
  background: #3a4050;
}

.stack {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.stack .window:last-child {
  flex: 1;
}

/* The terminal that plays the lifecycle */

.player .scenes {
  min-height: 22rem;
}

@media (max-width: 600px) {
  .player .scenes {
    min-height: 19rem;
  }
}

.player .scene + .scene {
  border-top: 1px dashed var(--night-edge);
}

.player.live .scene + .scene {
  border-top: 0;
}

.player.live .scene {
  display: none;
}

.player.live .scene.on {
  display: block;
}

.steps {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  padding: 0.75rem 1rem;
  border-top: 1px solid var(--night-edge);
  background: var(--night-3);
}

.step {
  padding: 0.3rem 0.7rem;
  border: 1px solid var(--night-edge);
  border-radius: 999px;
  background: transparent;
  color: var(--night-muted);
  font: 500 0.78rem/1.2 var(--mono);
  cursor: pointer;
  transition: var(--lift);
}

.step:hover {
  color: var(--night-ink);
}

.step[aria-pressed='true'] {
  border-color: var(--teal);
  background: color-mix(in srgb, var(--teal) 18%, transparent);
  color: var(--night-ink);
}

.t-p {
  color: var(--teal);
  user-select: none;
}

.t-path {
  color: #7f86a0;
  user-select: none;
}

.t-c {
  color: #ffffff;
}

.t-o {
  color: #b7bccb;
}

.t-dim {
  color: #7f86a0;
}

.t-log {
  color: #5fd3e0;
}

.t-ok {
  color: #3fd0b8;
}

.t-pass {
  padding: 0 0.35em;
  border-radius: 3px;
  background: #1a9e79;
  color: #ffffff;
  font-weight: 600;
}

.t-head {
  padding: 0 0.35em;
  border-radius: 3px;
  background: #e8e6e1;
  color: #121419;
  font-weight: 600;
}

.t-err {
  color: #ff7a6b;
  font-weight: 600;
}

.t-b {
  color: #ffffff;
  font-weight: 600;
}

.caret {
  display: inline-block;
  width: 0.55em;
  height: 1.1em;
  margin-left: 1px;
  vertical-align: -0.2em;
  background: var(--teal);
  animation: blink 1s steps(1) infinite;
}

@keyframes blink {
  50% {
    opacity: 0;
  }
}

/* Highlighted Zuri */

.zk {
  color: #ff9e6b;
}

.zs {
  color: #5fd3c2;
}

.zn {
  color: #f9b44c;
}

.zf {
  color: #a9b8ff;
}

.zc {
  color: #6f768b;
  font-style: italic;
}

.zd {
  color: #d3a6ff;
}

.zt {
  color: #ffd27a;
}

/* Toolchain strip under the hero */

.strip {
  border-top: 1px solid var(--edge);
  border-bottom: 1px solid var(--edge);
  background: var(--paper-2);
}

.strip-inner {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  padding-top: 1.1rem;
  padding-bottom: 1.1rem;
  overflow: hidden;
}

.strip-label {
  flex: none;
  color: var(--muted);
  font-size: 0.86rem;
  font-weight: 500;
}

.strip-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.strip-list li {
  padding: 0.22rem 0.6rem;
  border: 1px solid var(--edge);
  border-radius: 999px;
  background: var(--paper);
  color: var(--ink-2);
  font-size: 0.8rem;
  font-weight: 500;
  white-space: nowrap;
}

@media (max-width: 760px) {
  .strip-inner {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* Toolchain cards */

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

@media (max-width: 960px) {
  .tools {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 600px) {
  .tools {
    grid-template-columns: minmax(0, 1fr);
  }
}

.card {
  --accent: var(--gold);

  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  padding: 1.4rem 1.4rem 1.3rem;
  border: 1px solid var(--edge);
  border-radius: var(--r-lg);
  background: var(--paper);
  text-decoration: none;
  transition: var(--lift);
}

a.card:hover {
  transform: translateY(-3px);
  border-color: var(--accent);
  box-shadow: 0 22px 40px -28px color-mix(in srgb, var(--accent) 70%, transparent);
}

.card .cmdline {
  align-self: flex-start;
  padding: 0.25rem 0.55rem;
  border-radius: var(--r-sm);
  background: color-mix(in srgb, var(--accent) 14%, transparent);
  color: color-mix(in srgb, var(--accent) 75%, var(--ink));
  font: 600 0.82rem/1.3 var(--mono);
}

.card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.card .go {
  margin-top: auto;
  padding-top: 0.35rem;
  color: var(--ink-2);
  font-size: 0.86rem;
  font-weight: 600;
}

.card .go::after {
  content: ' \2192';
}

/* The ecosystem tax */

.tax {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr);
  gap: clamp(2rem, 5vw, 5rem);
  align-items: start;
}

@media (max-width: 900px) {
  .tax {
    grid-template-columns: minmax(0, 1fr);
  }
}

.prose p {
  margin: 0 0 1.1rem;
  color: var(--muted);
  font-size: 1.04rem;
}

.prose strong {
  color: var(--ink);
}

.dark .prose p {
  color: var(--night-muted);
}

.dark .prose strong {
  color: var(--night-ink);
}

.pull {
  margin: 1.75rem 0;
  padding: 0.25rem 0 0.25rem 1.25rem;
  border-left: 3px solid var(--red);
  color: var(--ink);
  font: 700 clamp(1.25rem, 2.2vw, 1.55rem)/1.3 var(--display);
  letter-spacing: -0.015em;
}

.swap {
  margin: 0;
  padding: 0;
  list-style: none;
  border: 1px solid var(--edge);
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--paper);
}

.swap li {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: center;
  gap: 1rem;
  padding: 0.8rem 1.2rem;
  border-top: 1px solid var(--edge);
}

.swap li:first-child {
  border-top: 0;
}

.swap .head-row {
  background: var(--paper-2);
  color: var(--faint);
  font: 600 0.72rem/1.2 var(--mono);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.swap .from {
  color: var(--faint);
  text-decoration: line-through;
  text-decoration-color: color-mix(in srgb, var(--faint) 70%, transparent);
  text-decoration-thickness: 1px;
}

.swap .to code {
  color: var(--ink);
  font-size: 0.88rem;
  font-weight: 600;
}

.swap .via {
  color: var(--edge-2);
}

@media (max-width: 520px) {
  .swap li {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  }

  .swap .via {
    display: none;
  }
}

/* Code beside its output */

.pair {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  gap: 1rem;
  align-items: stretch;
}

@media (max-width: 900px) {
  .pair {
    grid-template-columns: minmax(0, 1fr);
  }
}

.pair .window {
  display: flex;
  flex-direction: column;
}

.pair .window pre {
  flex: 1;
}

.output-figure {
  margin: 0 1.25rem 1.25rem;
  border-radius: var(--r-md);
  overflow: hidden;
  border: 1px solid var(--night-edge);
}

.output-figure img {
  width: 100%;
  height: auto;
}

.dialect-notes {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(1.5rem, 4vw, 3rem);
  margin-top: 2.5rem;
}

@media (max-width: 760px) {
  .dialect-notes {
    grid-template-columns: minmax(0, 1fr);
  }
}

.dialect-notes p {
  margin: 0;
  color: var(--night-muted);
  font-size: 1.04rem;
}

.dialect-notes strong {
  color: var(--night-ink);
}

/* Batteries */

.battery-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 1.25rem;
}

.battery-tabs .tab {
  padding: 0.5rem 0.95rem;
  border: 1px solid var(--edge);
  border-radius: 999px;
  background: var(--paper);
  color: var(--ink-2);
  font-size: 0.9rem;
}

.battery-tabs .tab[aria-selected='true'] {
  border-color: var(--ink);
  background: var(--ink);
  color: var(--paper);
}

.panel-note {
  margin: 1rem 0 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.panel-note code {
  font-size: 0.88em;
}

/* Module catalogue */

.modules {
  columns: 4 15rem;
  column-gap: 0.75rem;
  margin: 0;
}

.module {
  --accent: var(--gold);

  break-inside: avoid;
  margin-bottom: 0.75rem;
  padding: 1.1rem 1.15rem 1.15rem;
  border: 1px solid var(--edge);
  border-top: 3px solid var(--accent);
  border-radius: var(--r-md);
  background: var(--paper);
}

.module dt {
  margin-bottom: 0.55rem;
  color: var(--ink);
  font: 700 1rem/1.2 var(--display);
}

.module dd {
  margin: 0;
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.75;
}

.module dd code {
  margin-right: 0.15rem;
  padding: 0.08em 0.4em;
  border-radius: 4px;
  background: color-mix(in srgb, var(--accent) 13%, transparent);
  color: var(--ink);
  font-size: 0.86em;
  font-weight: 600;
}

.module dd span {
  margin-right: 0.35rem;
}

.closing {
  max-width: 46rem;
  margin: 2.5rem 0 0;
  color: var(--muted);
  font-size: 1.08rem;
}

/* Ship it */

.ship {
  position: relative;
  overflow: hidden;
  isolation: isolate;
}

.ship::before {
  content: '';
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(36rem 24rem at 100% 0%, color-mix(in srgb, var(--purple) 30%, transparent), transparent 70%),
    radial-gradient(30rem 22rem at 0% 100%, color-mix(in srgb, var(--teal) 24%, transparent), transparent 70%);
}

.ship-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: clamp(2rem, 5vw, 4.5rem);
  align-items: center;
}

@media (max-width: 960px) {
  .ship-grid {
    grid-template-columns: minmax(0, 1fr);
  }
}

.formats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
  margin: 2rem 0 0;
}

.format {
  padding: 1rem 1.1rem;
  border: 1px solid var(--night-edge);
  border-radius: var(--r-md);
  background: color-mix(in srgb, var(--night-2) 80%, transparent);
}

.format strong {
  display: block;
  margin-bottom: 0.25rem;
  color: var(--night-ink);
  font: 700 1rem/1.3 var(--display);
}

.format span {
  color: var(--night-muted);
  font-size: 0.9rem;
}

.format code {
  color: var(--gold);
  font-size: 0.82rem;
}

@media (max-width: 480px) {
  .formats {
    grid-template-columns: minmax(0, 1fr);
  }
}

.platforms {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 1.5rem 0 0;
  padding: 0;
  list-style: none;
}

.platforms li {
  padding: 0.3rem 0.65rem;
  border: 1px solid var(--night-edge);
  border-radius: 999px;
  color: var(--night-ink);
  font: 500 0.78rem/1.3 var(--mono);
}

.ship-note {
  margin: 1.5rem 0 0;
  color: var(--night-muted);
  font-size: 0.98rem;
}

.ship-note code {
  padding: 0.1em 0.35em;
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.08);
  font-size: 0.88em;
}

/* Packages and Nyssa */

.split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: clamp(1.25rem, 3vw, 2rem);
}

@media (max-width: 960px) {
  .split {
    grid-template-columns: minmax(0, 1fr);
  }
}

.split > div {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.ticks {
  display: grid;
  gap: 0.6rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.tick {
  position: relative;
  padding-left: 1.6rem;
  color: var(--muted);
  font-size: 0.97rem;
}

.tick::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.45em;
  width: 0.85rem;
  height: 0.5rem;
  border-left: 2px solid var(--accent, var(--teal));
  border-bottom: 2px solid var(--accent, var(--teal));
  transform: rotate(-45deg);
}

.tick strong {
  color: var(--ink);
}

.subhead {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
}

.subhead h3 {
  font-size: 1.45rem;
}

/* The language */

.lang {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr);
  gap: clamp(2rem, 5vw, 4.5rem);
  align-items: start;
}

@media (max-width: 960px) {
  .lang {
    grid-template-columns: minmax(0, 1fr);
  }
}

.errors {
  display: grid;
  gap: 1rem;
}

.errors .window pre {
  font-size: 0.78rem;
  padding: 0.95rem 1.1rem 1.05rem;
}

.error-label {
  padding: 0.85rem 1.1rem 0;
  color: var(--night-ink);
  font: 700 0.98rem/1.3 var(--display);
}

.error-label span {
  display: block;
  margin-top: 0.15rem;
  color: var(--night-muted);
  font: 400 0.86rem/1.4 var(--body);
}

/* The editor */

.editor-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
  gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
}

@media (max-width: 960px) {
  .editor-grid {
    grid-template-columns: minmax(0, 1fr);
  }
}

.editor pre {
  padding-bottom: 6.5rem;
  overflow: visible;
}

.editor .ln {
  display: block;
  position: relative;
  padding-left: 2.6rem;
  counter-increment: line;
}

.editor code {
  counter-reset: line;
}

.editor .ln::before {
  content: counter(line);
  position: absolute;
  left: 0;
  width: 1.6rem;
  color: #4b5163;
  text-align: right;
}

.squiggle {
  text-decoration: underline wavy #ff6b5b;
  text-decoration-thickness: 1.5px;
  text-underline-offset: 4px;
}

.cursor {
  display: inline-block;
  width: 2px;
  height: 1.15em;
  vertical-align: -0.2em;
  background: var(--night-ink);
}

.popup {
  position: absolute;
  z-index: 2;
  top: calc(100% + 0.3rem);
  border: 1px solid #343a4a;
  border-radius: var(--r-sm);
  background: #1d2130;
  box-shadow: 0 16px 36px -16px rgba(0, 0, 0, 0.8);
  font-size: 0.78rem;
  line-height: 1.5;
  white-space: normal;
}

.popup.hover {
  left: 6.2rem;
  right: 0.5rem;
  max-width: 30rem;
  padding: 0.5rem 0.75rem;
  color: #e3e0da;
  font-family: var(--body);
}

.popup.hover b {
  margin-right: 0.3rem;
  color: #ff8a7a;
  font-family: var(--mono);
  font-weight: 600;
}

.popup.complete {
  left: 7.4rem;
  display: grid;
  min-width: 15rem;
  padding: 0.25rem;
}

.popup.complete > span {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  color: #d9d6cf;
  white-space: nowrap;
}

.popup.complete > span.sel {
  background: #2f3a5a;
}

.popup.complete i {
  display: inline-grid;
  place-items: center;
  width: 1.05rem;
  height: 1.05rem;
  border-radius: 3px;
  font: 700 0.62rem/1 var(--body);
  font-style: normal;
}

.popup.complete i.m {
  background: #4d3a74;
  color: #d3a6ff;
}

.popup.complete i.f {
  background: #1f4f4b;
  color: #5fd3c2;
}

.popup.complete small {
  margin-left: auto;
  padding-left: 1rem;
  color: #8a90a3;
  font-size: 0.74rem;
}

@media (max-width: 520px) {
  .popup.hover {
    left: 2.6rem;
  }

  .popup.complete {
    left: 3.5rem;
  }
}

.features {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.1rem 1.5rem;
  margin: 2rem 0 0;
  padding: 0;
  list-style: none;
}

@media (max-width: 520px) {
  .features {
    grid-template-columns: minmax(0, 1fr);
  }
}

.features strong {
  display: block;
  color: var(--night-ink);
  font: 700 0.98rem/1.3 var(--display);
}

.features span {
  color: var(--night-muted);
  font-size: 0.9rem;
}

.editors {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 2rem 0 0;
}

.editors a,
.editors span {
  padding: 0.45rem 0.85rem;
  border: 1px solid var(--night-edge);
  border-radius: var(--r-sm);
  color: var(--night-ink);
  font-size: 0.88rem;
  font-weight: 500;
  text-decoration: none;
  transition: var(--lift);
}

.editors a:hover {
  border-color: var(--night-muted);
}

/* Performance */

.tiers {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: tier;
}

@media (max-width: 860px) {
  .tiers {
    grid-template-columns: minmax(0, 1fr);
  }
}

.tier {
  --accent: var(--gold);

  position: relative;
  padding: 1.5rem 1.5rem 1.6rem;
  border: 1px solid var(--edge);
  background: var(--paper);
}

.tier:first-child {
  border-radius: var(--r-lg) 0 0 var(--r-lg);
}

.tier:last-child {
  border-radius: 0 var(--r-lg) var(--r-lg) 0;
}

.tier + .tier {
  border-left: 0;
}

@media (max-width: 860px) {
  .tier:first-child {
    border-radius: var(--r-lg) var(--r-lg) 0 0;
  }

  .tier:last-child {
    border-radius: 0 0 var(--r-lg) var(--r-lg);
  }

  .tier + .tier {
    border-left: 1px solid var(--edge);
    border-top: 0;
  }
}

.tier::before {
  counter-increment: tier;
  content: '0' counter(tier);
  display: block;
  margin-bottom: 0.9rem;
  color: var(--accent);
  font: 700 0.85rem/1 var(--mono);
}

.tier h3 {
  margin-bottom: 0.5rem;
}

.tier p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.perf-notes {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(1.25rem, 3vw, 2.5rem);
  margin-top: 2.5rem;
}

@media (max-width: 860px) {
  .perf-notes {
    grid-template-columns: minmax(0, 1fr);
  }
}

.perf-notes h3 {
  margin-bottom: 0.4rem;
  font-size: 1.05rem;
}

.perf-notes p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

/* Documentation */

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

@media (max-width: 760px) {
  .shelf {
    grid-template-columns: minmax(0, 1fr);
  }
}

.doc {
  --accent: var(--gold);

  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  padding: clamp(1.5rem, 3vw, 2.25rem);
  border: 1px solid var(--night-edge);
  border-radius: var(--r-lg);
  background: var(--night-2);
  text-decoration: none;
  transition: var(--lift);
}

.doc:hover {
  transform: translateY(-3px);
  border-color: var(--accent);
}

.doc .rule {
  width: 2.5rem;
  height: 4px;
  border-radius: 2px;
  background: var(--accent);
}

.doc h3 {
  font-size: clamp(1.35rem, 2.4vw, 1.75rem);
}

.doc p {
  margin: 0;
  color: var(--night-muted);
}

.doc .go {
  margin-top: auto;
  padding-top: 0.5rem;
  font-weight: 600;
}

.doc .go::after {
  content: ' \2192';
}

/* Roadmap */

.road {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
  gap: clamp(2rem, 5vw, 4rem);
}

@media (max-width: 860px) {
  .road {
    grid-template-columns: minmax(0, 1fr);
  }
}

.road h3 {
  margin-bottom: 1.1rem;
  font-size: 1.1rem;
}

.road .ticks {
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 15rem), 1fr));
  gap: 0.6rem 1.5rem;
}

.road .next .ticks {
  grid-template-columns: minmax(0, 1fr);
}

.road .next .tick::before {
  width: 0.55rem;
  height: 0.55rem;
  top: 0.5em;
  border: 2px solid var(--purple);
  border-radius: 50%;
  transform: none;
}

/* AI involvement */

.ai {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding: clamp(1.5rem, 3vw, 2.25rem);
  border: 1px solid var(--edge);
  border-radius: var(--r-lg);
  background: var(--paper);
}

.ai p {
  max-width: 46rem;
  margin: 0.5rem 0 0;
  color: var(--muted);
}

.ai h3 {
  font-size: 1.3rem;
}

/* Closing call */

.finale {
  position: relative;
  overflow: hidden;
  isolation: isolate;
  text-align: center;
}

.finale::before {
  content: '';
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(30rem 20rem at 20% 0%, color-mix(in srgb, var(--gold) 26%, transparent), transparent 70%),
    radial-gradient(30rem 20rem at 80% 100%, color-mix(in srgb, var(--purple) 30%, transparent), transparent 70%);
}

.finale .mark {
  width: 5.5rem;
  margin: 0 auto 1.75rem;
}

.finale h2 {
  margin: 0 auto;
}

.finale .install {
  margin: 2.25rem auto 0;
  text-align: left;
}

.finale .tabs {
  justify-content: center;
}

.finale .actions {
  justify-content: center;
}

/* Footer */

footer {
  border-top: 1px solid var(--edge);
  background: var(--paper);
}

.foot {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) repeat(3, minmax(0, 1fr));
  gap: 2rem;
  padding-top: 3.5rem;
  padding-bottom: 3rem;
}

@media (max-width: 860px) {
  .foot {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.foot p {
  max-width: 20rem;
  margin: 0.9rem 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.foot h4 {
  margin: 0 0 0.9rem;
  color: var(--faint);
  font: 600 0.74rem/1 var(--mono);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.foot ul {
  display: grid;
  gap: 0.55rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.foot a {
  color: var(--ink-2);
  font-size: 0.92rem;
  text-decoration: none;
}

.foot a:hover {
  color: var(--ink);
  text-decoration: underline;
}

.legal {
  margin: 0;
  padding: 1.25rem 0 2rem;
  border-top: 1px solid var(--edge);
  color: var(--faint);
  font-size: 0.84rem;
}

/* Accents come last, so they win over each component's default. */

.a-gold {
  --accent: var(--gold);
}

.a-red {
  --accent: var(--red);
}

.a-teal {
  --accent: var(--teal);
}

.a-purple {
  --accent: var(--purple);
}