/* The Fizlet site. The page itself is a Board UI root (<html class="bui">), so every colour, key,
   sticker and card is the Battlefield design system's own (src/ui/board-ui.css): vertical hard
   bases, ink rims, neon faces. This file only adds page furniture on top, matching the DOM
   Battlefield site's header, footer, section heads and panels so the two read as siblings. */
:root {
  --sans: Inter, "SF Pro Display", "Segoe UI", system-ui, -apple-system, Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --page: 1200px;
  --gutter: 30px;
  /* A panel's base: the card colour pushed into the rim, straight below (never to the side). */
  --base: color-mix(in srgb, var(--k-cmd) 38%, var(--rim));
  --grid: color-mix(in srgb, var(--k-sys) 9%, transparent);
  --code-bg: #0b0918;
  --hl: var(--k-go);
}
html.bui[data-theme="light"] {
  --base: color-mix(in srgb, var(--k-cmd) 30%, var(--line));
  --grid: color-mix(in srgb, var(--k-cmd) 9%, transparent);
  --code-bg: #f6f5fd;
  --hl: #0e8a5f;
}
*,
*::before,
*::after {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
  scroll-padding-top: 90px;
  -webkit-text-size-adjust: 100%;
}
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}
body {
  margin: 0;
  min-width: 320px;
  font: 16px/1.6 var(--sans);
  color: var(--ink);
  background: var(--bg);
  overflow-x: hidden;
}
a {
  color: inherit;
}
img,
svg,
canvas {
  display: block;
  max-width: 100%;
}
code,
kbd,
pre {
  font-family: var(--mono);
}
code {
  font-size: 0.88em;
  color: var(--k-sys-ink);
  overflow-wrap: anywhere;
}
:focus-visible {
  outline: 3px solid var(--k-sys-ink);
  outline-offset: 3px;
}
.wrap {
  width: 100%;
  max-width: var(--page);
  margin: 0 auto;
  padding: 0 var(--gutter);
}
.skip {
  position: absolute;
  left: 12px;
  top: -60px;
  z-index: 100;
  padding: 10px 14px;
  background: var(--k-sys);
  color: var(--rim);
  font: 700 12px var(--mono);
  border-radius: 8px;
}
.skip:focus {
  top: 12px;
}
.sr {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

/* ---------- Type ---------- */
.eyebrow {
  display: inline-flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 0;
  font: 700 11px/1.4 var(--mono);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}
.eyebrow b,
.eyebrow .index {
  color: var(--k-sys-ink);
  font-weight: 800;
}
/* The section number: a little sticker, tilted, on the ink rim. */
.eyebrow .index {
  display: inline-block;
  padding: 3px 7px;
  color: var(--rim);
  background: var(--k-sys);
  border: 2px solid var(--rim);
  border-radius: 5px;
  box-shadow: 0 3px 0 var(--rim);
  rotate: -4deg;
  letter-spacing: 0.08em;
}
.eyebrow .dot {
  width: 8px;
  height: 8px;
  background: var(--team-a);
  box-shadow: 0 0 12px var(--team-a);
}
h1,
h2,
h3 {
  margin: 0;
  font-family: var(--sans);
  font-weight: 800;
  letter-spacing: -0.035em;
  line-height: 1.02;
}
h2 {
  font-size: clamp(32px, 4.4vw, 54px);
}
h3 {
  font-size: 19px;
  letter-spacing: -0.02em;
  line-height: 1.2;
}
h1 em,
h2 em {
  font-style: normal;
  color: var(--k-attack);
}
.lead {
  margin: 0;
  max-width: 620px;
  font-size: 18px;
  line-height: 1.65;
  color: var(--muted);
}
.lead b {
  color: var(--ink);
}
.lead a,
.body a {
  color: var(--k-sys-ink);
}
.body {
  margin: 16px 0 0;
  max-width: 560px;
  color: var(--muted);
  line-height: 1.7;
}
.body b {
  color: var(--ink);
}

/* ---------- Panels: the game's card. Ink rim, coloured border, a hard base straight below. ---------- */
.panel {
  position: relative;
  background: var(--card);
  border: 2px solid var(--line);
  border-radius: 14px;
  box-shadow: 0 6px 0 var(--base);
}
.panel.lit {
  border-color: var(--k-cmd);
  box-shadow: 0 6px 0 color-mix(in srgb, var(--k-cmd) 55%, var(--rim)), 0 0 28px color-mix(in srgb, var(--k-cmd) 22%, transparent);
}
html.bui[data-theme="light"] .panel.lit {
  box-shadow: 0 6px 0 color-mix(in srgb, var(--k-cmd) 55%, var(--line));
}

/* ---------- Header ---------- */
.site-head {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 2px solid var(--line);
}
.site-head .wrap {
  display: flex;
  align-items: center;
  gap: 18px;
  min-height: 76px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--ink);
}
.brand-mark {
  display: grid;
  place-items: center;
  flex: none;
  width: 44px;
  height: 44px;
  color: var(--team-a);
  background: var(--rim);
  border: 2px solid color-mix(in srgb, var(--k-sys) 70%, transparent);
}
.brand-mark svg {
  width: 40px;
  height: 40px;
}
.brand-text {
  display: grid;
  line-height: 1.05;
  font-family: var(--mono);
}
.brand-text small {
  font-size: 11px;
  letter-spacing: 0.08em;
}
.brand-text small i {
  margin-left: 8px;
  font-style: normal;
  font-size: 9px;
  color: var(--k-sys-ink);
  letter-spacing: 0.12em;
}
.brand-text b {
  font-size: 19px;
  letter-spacing: 0.1em;
}
.site-nav {
  display: flex;
  gap: 4px;
  margin-left: auto;
}
.site-nav a {
  padding: 8px 12px;
  font: 700 11px var(--mono);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--muted);
  border-radius: 8px;
}
.site-nav a:hover {
  color: var(--ink);
  background: var(--surface);
}
.head-keys {
  display: flex;
  align-items: center;
  gap: 10px;
}
.head-keys .bui-icon-key {
  width: 42px;
  height: 42px;
}
.head-keys .bui-icon-key svg {
  width: 20px;
  height: 20px;
}
@media (max-width: 960px) {
  .site-nav {
    display: none;
  }
  .head-keys {
    margin-left: auto;
  }
}
@media (max-width: 520px) {
  :root {
    --gutter: 18px;
  }
  .brand-text small i,
  .head-keys .gh {
    display: none;
  }
}
@media (max-width: 380px) {
  .site-head .wrap {
    gap: 10px;
  }
  .brand-mark {
    width: 38px;
    height: 38px;
  }
  .brand-mark svg {
    width: 34px;
    height: 34px;
  }
  .brand-text b {
    font-size: 16px;
  }
  .head-keys {
    gap: 8px;
  }
  .start-key-sm {
    padding-inline: 10px;
  }
}
html.bui[data-theme="dark"] .theme-light,
html.bui[data-theme="light"] .theme-dark {
  display: none;
}
a.bui-arcade,
a.bui-sticker-key {
  text-decoration: none;
}

/* ---------- Footer ---------- */
.site-foot {
  margin-top: 40px;
  border-top: 2px solid var(--line);
  background: var(--surface);
}
.site-foot .wrap {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) repeat(3, minmax(0, 1fr));
  gap: 28px;
  padding-top: 40px;
  padding-bottom: 40px;
}
.site-foot p {
  margin: 10px 0 0;
  max-width: 340px;
  font-size: 14px;
  color: var(--muted);
}
.site-foot h4 {
  margin: 0 0 10px;
  font: 700 11px var(--mono);
  letter-spacing: 0.14em;
  color: var(--muted);
}
.site-foot ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 6px;
  font-size: 14px;
}
.site-foot ul a {
  text-decoration: none;
}
.site-foot ul a:hover {
  color: var(--k-sys-ink);
}
.foot-base {
  border-top: 1px solid var(--line);
}
.foot-base .wrap {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 10px;
  padding-top: 16px;
  padding-bottom: 20px;
  font: 11px var(--mono);
  letter-spacing: 0.08em;
  color: var(--muted);
}
@media (max-width: 860px) {
  .site-foot .wrap {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  }
  .site-foot .foot-brand {
    grid-column: 1 / -1;
  }
}

/* ---------- Code ---------- */
.code {
  margin: 0;
  padding: 14px 16px;
  overflow-x: auto;
  font: 12.5px/1.6 var(--mono);
  color: var(--ink);
  background: var(--code-bg);
  border: 1.5px solid var(--line);
  border-radius: 10px;
  tab-size: 2;
}
.code code {
  color: inherit;
  font-size: inherit;
  overflow-wrap: normal;
}
.code.wrap {
  white-space: pre-wrap;
  word-break: break-all;
}
.code-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  padding: 16px;
  min-width: 0;
}
.code-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}
.bui .copy {
  --py: 2px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 0;
  padding: 5px 10px;
  font: 700 10px var(--mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  border-width: 1.5px;
}
.bui .copy svg {
  width: 14px;
  height: 14px;
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  overflow: hidden;
  isolation: isolate;
  border-bottom: 2px solid var(--line);
  background: radial-gradient(ellipse 70% 70% at 80% 30%, color-mix(in srgb, var(--k-cmd) 16%, transparent), transparent 70%), var(--bg);
}
.hero-field {
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    linear-gradient(var(--grid) 1px, transparent 1px) 0 0 / 44px 44px,
    linear-gradient(90deg, var(--grid) 1px, transparent 1px) 0 0 / 44px 44px;
  mask-image: radial-gradient(ellipse 100% 90% at 60% 50%, #000 40%, transparent 100%);
}
.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
  gap: clamp(30px, 5vw, 64px);
  align-items: center;
  padding-top: clamp(40px, 7vh, 80px);
  padding-bottom: clamp(56px, 8vh, 96px);
}
.hero h1 {
  margin: 22px 0 24px;
  font-size: clamp(52px, 7.4vw, 104px);
  line-height: 0.92;
  letter-spacing: -0.05em;
}
.hero h1 em {
  color: var(--team-a);
  text-shadow: 0 0 40px color-mix(in srgb, var(--team-a) 35%, transparent);
}
html.bui[data-theme="light"] .hero h1 em {
  color: color-mix(in srgb, var(--team-a) 55%, #0b3d2c);
  text-shadow: none;
}
.hero-keys {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 16px;
  margin-top: 30px;
}
.hero-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font: 700 12px var(--mono);
  letter-spacing: 0.04em;
  color: var(--muted);
  text-decoration: none;
}
.hero-link:hover {
  color: var(--ink);
}
.hero-install {
  max-width: 560px;
  margin-top: 30px;
  padding: 12px 14px 14px;
  background: color-mix(in srgb, var(--surface) 80%, transparent);
  border: 2px solid var(--line);
  border-radius: 12px;
  box-shadow: 0 4px 0 var(--base);
}
.hero-install .code {
  padding: 10px 12px;
  color: var(--k-sys-ink);
}

/* ---------- The live demo ---------- */
.demo {
  margin: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  padding: 14px;
  min-width: 0;
}
.demo-chrome {
  display: flex;
  align-items: center;
  gap: 6px;
  font: 700 10px var(--mono);
  letter-spacing: 0.08em;
  color: var(--muted);
}
.demo-chrome i {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--k-fire);
}
.demo-chrome i:nth-child(2) {
  background: var(--hurt);
}
.demo-chrome i:nth-child(3) {
  background: var(--k-go);
}
.demo-url {
  margin-left: 6px;
  padding: 3px 10px;
  border: 1.5px solid var(--line);
  border-radius: 6px;
  background: var(--surface);
}
.demo-state {
  margin-left: auto;
  padding: 3px 8px;
  color: var(--rim);
  background: var(--k-go);
  border: 1.5px solid var(--rim);
  border-radius: 5px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  min-width: 0;
}
.demo[data-running="0"] .demo-state {
  background: var(--k-flag);
}
.demo-board {
  position: relative;
  height: clamp(250px, 30vw, 330px);
  overflow: hidden;
  border: 2px solid var(--rim);
  border-radius: 10px;
  background:
    linear-gradient(var(--grid) 1px, transparent 1px) 0 0 / 22px 22px,
    linear-gradient(90deg, var(--grid) 1px, transparent 1px) 0 0 / 22px 22px,
    var(--bg);
  cursor: crosshair;
  user-select: none;
  -webkit-user-select: none;
  touch-action: manipulation;
}
.demo-page {
  position: absolute;
  inset: 0;
  padding: clamp(18px, 3vw, 30px);
}
.demo-title {
  margin: 0 0 14px;
  font: 900 clamp(38px, 5.4vw, 66px) / 1 var(--sans);
  letter-spacing: -0.04em;
}
.dl,
.dw,
.demo-btn,
.demo-chip {
  display: inline-block;
  transform-origin: 50% 60%;
}
.dl.hot {
  color: var(--k-attack);
  text-shadow: 0 0 18px color-mix(in srgb, var(--k-attack) 55%, transparent);
}
html.bui[data-theme="light"] .dl.hot {
  text-shadow: none;
}
.demo-copy {
  margin: 0 0 18px;
  max-width: 440px;
  font-size: clamp(14px, 1.4vw, 16px);
  line-height: 1.55;
  color: var(--muted);
}
.demo-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}
.demo-btn {
  padding: 9px 16px;
  font: 800 12px var(--mono);
  letter-spacing: 0.12em;
  color: var(--rim);
  background: var(--k-sys);
  border: 2px solid var(--rim);
  border-radius: 8px;
  box-shadow: 0 4px 0 color-mix(in srgb, var(--k-sys) 45%, var(--rim));
}
.demo-chip {
  padding: 4px 9px;
  font: 800 10px var(--mono);
  letter-spacing: 0.1em;
  color: var(--rim);
  background: var(--k-fallin);
  border: 2px solid var(--rim);
  border-radius: 5px;
}
.demo-chip.alt {
  background: var(--k-cmd);
  color: #f6f3ff;
}
.demo-fx {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}
.demo-hint {
  position: absolute;
  right: 12px;
  bottom: 10px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0;
  font: 800 10px var(--mono);
  letter-spacing: 0.14em;
  color: var(--k-attack);
  pointer-events: none;
}
.demo-hint.gone {
  display: none;
}
.blink {
  width: 9px;
  height: 9px;
  border: 2px solid currentColor;
  animation: blink 1.1s steps(2) infinite;
}
@keyframes blink {
  50% {
    opacity: 0;
  }
}
.demo-slam {
  position: absolute;
  inset: auto 0 0;
  height: 110px;
  pointer-events: none;
}
.demo-slam[hidden] {
  display: none;
}
.demo-slam .bui-sticker b {
  font-size: 26px;
}
.demo-keys {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}
.demo-keys [data-sound] {
  margin-left: auto;
}
.demo-keys [data-sound][aria-pressed="false"] .snd-on,
.demo-keys [data-sound][aria-pressed="true"] .snd-off {
  display: none;
}
.demo-stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  overflow: hidden;
  border: 1.5px solid var(--line);
  border-radius: 10px;
  background: var(--line);
}
.demo-stats div {
  display: grid;
  gap: 2px;
  padding: 8px 10px;
  background: var(--surface);
  min-width: 0;
}
.demo-stats dt {
  font: 700 9px var(--mono);
  letter-spacing: 0.12em;
  color: var(--muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.demo-stats dd {
  margin: 0;
  font: 800 16px var(--mono);
  font-variant-numeric: tabular-nums;
  color: var(--ink);
}
.demo-stats [data-stat="layout"] {
  color: var(--hl);
}
.demo .bui-label,
.code-head .bui-label {
  white-space: normal;
}

/* ---------- Stats strip ---------- */
.stats {
  border-bottom: 2px solid var(--line);
  background: var(--surface);
}
.stats-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 34px;
  padding-top: 22px;
  padding-bottom: 22px;
}
.stats-row span {
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
}
.stats-row b {
  font: 800 20px var(--mono);
}
.stats-row small {
  font: 700 10px var(--mono);
  letter-spacing: 0.14em;
  color: var(--muted);
}
.stats-row .soon {
  margin-left: auto;
  align-items: center;
}
.stats-row .soon i {
  width: 8px;
  height: 8px;
  background: var(--k-go);
  box-shadow: 0 0 10px var(--k-go);
}
.stats-row .soon b {
  font-size: 12px;
  color: var(--k-sys-ink);
  letter-spacing: 0.14em;
}

/* ---------- Sections ---------- */
.section {
  padding: clamp(70px, 10vw, 120px) 0 0;
}
.section-head {
  max-width: 780px;
  margin-bottom: 44px;
}
.section h2 {
  margin: 16px 0 18px;
}
.split {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: clamp(30px, 5vw, 64px);
  align-items: center;
}
.split.flip > :first-child {
  order: 2;
}
.split-keys,
.final-keys {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

/* 01 contract */
.rules {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
}
.rule {
  padding: 22px 22px 20px;
}
.rule > b {
  display: block;
  margin-bottom: 12px;
  font: 900 34px/1 var(--mono);
  color: transparent;
  -webkit-text-stroke: 1.5px var(--k-cmd);
}
.rule h3 {
  margin-bottom: 8px;
}
.rule p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--muted);
}

/* 02 bricks */
.bricks {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
}
.brick {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  align-content: start;
  gap: 12px;
  padding: 20px;
  min-width: 0;
  overflow: hidden;
}
.brick::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 5px;
  background: var(--tone);
}
.brick-top {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}
.brick-tag {
  padding: 4px 9px;
  font: 800 10px var(--mono);
  letter-spacing: 0.14em;
  color: var(--rim);
  background: var(--tone);
  border: 2px solid var(--rim);
  border-radius: 6px;
  box-shadow: 0 3px 0 var(--rim);
}
.brick-size {
  font: 12px var(--mono);
  color: var(--muted);
}
.brick-size b {
  font-size: 16px;
  color: var(--ink);
}
.brick h3 code {
  font-size: 20px;
  color: var(--ink);
}
.brick p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--muted);
}
.meter {
  display: block;
  height: 6px;
  background: var(--surface);
  border: 1.5px solid var(--line);
  border-radius: 3px;
  overflow: hidden;
}
.meter i {
  display: block;
  height: 100%;
  width: calc(var(--v) * 100%);
  background: var(--tone);
}

/* 03 phases */
.phases {
  list-style: none;
  margin: 0;
  padding: 22px;
  display: grid;
  gap: 14px;
  background:
    linear-gradient(var(--grid) 1px, transparent 1px) 0 0 / 30px 30px,
    linear-gradient(90deg, var(--grid) 1px, transparent 1px) 0 0 / 30px 30px,
    var(--card);
}
.phases li {
  position: relative;
  display: grid;
  grid-template-columns: 150px minmax(0, 1fr);
  gap: 4px 18px;
  padding: 16px 18px;
  background: var(--surface);
  border: 2px solid var(--rim);
  border-left: 6px solid var(--tone);
  border-radius: 10px;
  box-shadow: 0 4px 0 color-mix(in srgb, var(--tone) 45%, var(--rim));
}
.phases li + li::before {
  content: "";
  position: absolute;
  left: 40px;
  top: -16px;
  width: 2px;
  height: 14px;
  background: var(--line);
}
.phases b {
  font: 900 20px var(--mono);
  letter-spacing: 0.08em;
  color: var(--tone);
}
html.bui[data-theme="light"] .phases b {
  color: var(--ink);
}
.phases b small {
  font-size: 12px;
  color: var(--muted);
}
.phases span {
  grid-column: 1;
  font: 700 10px var(--mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
}
.phases p {
  grid-column: 2;
  grid-row: 1 / span 2;
  margin: 0;
  align-self: center;
  font-size: 14.5px;
  line-height: 1.55;
  color: var(--muted);
}

/* 04 loop */
.loop {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  padding: 22px;
}
.loop-row {
  display: grid;
  gap: 8px;
}
.raf,
.steps,
.slots {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 6px;
}
.raf i {
  height: 18px;
  background: var(--k-sys);
  border: 2px solid var(--rim);
  border-radius: 4px;
  box-shadow: 0 3px 0 color-mix(in srgb, var(--k-sys) 45%, var(--rim));
}
.raf i.long {
  background: var(--hurt);
  box-shadow: 0 3px 0 color-mix(in srgb, var(--hurt) 45%, var(--rim));
}
.engines {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}
.engines span {
  padding: 6px 8px;
  text-align: center;
  font: 800 11px var(--mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink);
  background: var(--surface);
  border: 2px solid var(--k-cmd);
  border-radius: 6px;
}
.steps span {
  display: grid;
  align-content: end;
  gap: 3px;
  min-height: 52px;
}
.steps i {
  height: 8px;
  background: var(--k-go);
  border-radius: 2px;
}
.steps i.drop {
  background: transparent;
  border: 1.5px dashed var(--k-fire);
}
.slots {
  grid-template-columns: repeat(12, minmax(0, 1fr));
}
.slots i {
  aspect-ratio: 1;
  border: 1.5px solid var(--line);
  border-radius: 3px;
}
.slots i.on {
  background: var(--k-fallin);
  border-color: var(--rim);
}
.loop-note {
  margin: 0;
  font-size: 13px;
  color: var(--muted);
}

/* 05 ledger */
.ledger {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  padding: 22px;
  min-width: 0;
}
.ledger-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}
.ledger-head .bui-label b {
  text-transform: none;
}
.ledger-led {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font: 800 9px var(--mono);
  letter-spacing: 0.14em;
  color: var(--hl);
}
.ledger-led::before {
  content: "";
  width: 8px;
  height: 8px;
  background: var(--k-go);
  box-shadow: 0 0 10px var(--k-go);
}
.table-scroll {
  overflow-x: auto;
  border: 1.5px solid var(--line);
  border-radius: 10px;
}
.ledger table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13.5px;
}
.ledger th {
  padding: 9px 12px;
  text-align: left;
  font: 700 9px var(--mono);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  background: var(--surface);
}
.ledger td {
  padding: 9px 12px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  vertical-align: top;
}
.ledger td:first-child {
  white-space: nowrap;
}
.ledger td code {
  overflow-wrap: normal;
}
.ledger-rules {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
  font-size: 14px;
  color: var(--muted);
}
.ledger-rules b {
  color: var(--ink);
}

/* 06 spec sheet */
.spec-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}
.spec-card {
  display: grid;
  align-content: start;
  gap: 4px;
  padding: 18px;
  min-width: 0;
}
.spec-card b {
  font: 800 32px/1 var(--mono);
  letter-spacing: -0.03em;
}
.spec-card span {
  font: 700 10px/1.4 var(--mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--k-sys-ink);
}
.spec-card small {
  font-size: 13px;
  line-height: 1.5;
  color: var(--muted);
}
.size-chips {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 26px 0 12px;
  padding: 0;
}
.size-chips li {
  position: relative;
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 7px 12px;
  overflow: hidden;
  font: 12px var(--mono);
  background: var(--surface);
  border: 2px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 3px 0 var(--base);
}
.size-chips li i {
  position: absolute;
  left: 0;
  bottom: 0;
  height: 3px;
  width: calc(var(--v) * 100%);
  background: var(--k-go);
}
.size-chips b {
  font-weight: 800;
}
.size-chips small {
  color: var(--muted);
}
.spec-note {
  margin: 0;
  max-width: 860px;
  font-size: 13px;
  color: var(--muted);
}

/* 07 pipeline */
.pipeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 16px;
}
.pipeline li {
  position: relative;
  display: grid;
  gap: 4px;
  padding: 18px 16px;
  background: var(--card);
  border: 2px solid var(--line);
  border-radius: 12px;
  box-shadow: 0 5px 0 var(--base);
}
.pipeline li + li::before {
  content: "";
  position: absolute;
  left: -16px;
  top: 50%;
  width: 16px;
  height: 2px;
  background: var(--k-cmd);
}
.pipeline li:last-child {
  border-color: var(--k-go);
}
.pipeline em {
  font: 800 11px var(--mono);
  font-style: normal;
  color: var(--k-cmd-ink);
}
.pipeline b {
  font: 800 14px var(--mono);
  overflow-wrap: anywhere;
}
.pipeline span {
  font-size: 13px;
  color: var(--muted);
}

/* 08 games */
.games {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
  grid-template-rows: auto auto;
  gap: 22px;
}
.game {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  align-content: start;
  gap: 14px;
  padding: 26px;
  min-width: 0;
}
.game.blitz {
  grid-row: span 2;
  background:
    radial-gradient(ellipse 80% 60% at 100% 0%, color-mix(in srgb, var(--k-attack) 16%, transparent), transparent 70%),
    var(--card);
}
.game h3 {
  font-size: clamp(24px, 2.6vw, 32px);
}
.game p:not(.eyebrow) {
  margin: 0;
  color: var(--muted);
  line-height: 1.65;
}
.game-keys {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 6px;
}

.game-facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}
.game-facts li {
  display: grid;
  gap: 2px;
  padding: 12px 14px;
  background: var(--surface);
  border: 2px solid var(--line);
  border-radius: 10px;
  min-width: 0;
}
.game-facts b {
  font: 800 20px var(--mono);
  color: var(--k-attack);
}
.game-facts span {
  font: 700 9px/1.4 var(--mono);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}
.game p.game-uses {
  font: 12px/1.8 var(--mono);
}

/* 09 roadmap */
.roadmap {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 260px), 1fr));
  gap: 22px;
}
.phase {
  --tone: var(--line);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  align-content: start;
  gap: 10px;
  padding: 20px;
  min-width: 0;
}
.phase[data-phase="done"] {
  --tone: var(--k-go);
}
.phase[data-phase="now"] {
  --tone: var(--k-sys);
  border-color: var(--k-sys);
}
.phase[data-phase="part"] {
  --tone: var(--hurt);
}
.phase-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}
.phase-id {
  font: 900 30px/1 var(--mono);
  color: var(--tone);
}
.phase[data-phase="next"] .phase-id {
  color: transparent;
  -webkit-text-stroke: 1.5px var(--muted);
}
.phase-pill {
  padding: 4px 8px;
  font: 800 9px var(--mono);
  letter-spacing: 0.12em;
  color: var(--rim);
  background: var(--tone);
  border: 1.5px solid var(--rim);
  border-radius: 5px;
  white-space: nowrap;
}
.phase[data-phase="next"] .phase-pill {
  color: var(--muted);
  background: transparent;
  border-color: var(--line);
}
.phase[data-phase="now"] .phase-pill {
  animation: bui-locked 1.8s ease-in-out infinite;
  --lock: var(--k-sys);
}
.phase p {
  margin: 0;
  font-size: 14px;
  line-height: 1.55;
  color: var(--muted);
}
.checks {
  list-style: none;
  margin: 4px 0 0;
  padding: 12px 0 0;
  display: grid;
  gap: 7px;
  border-top: 1px dashed var(--line);
  font-size: 13.5px;
  line-height: 1.4;
}
.checks li {
  display: grid;
  grid-template-columns: 18px minmax(0, 1fr);
  gap: 8px;
  color: var(--muted);
}
.checks li.done {
  color: var(--ink);
}
.checks i {
  display: grid;
  place-items: center;
  width: 18px;
  height: 18px;
  margin-top: -1px;
  border: 1.5px solid var(--line);
  border-radius: 4px;
}
.checks li.done i {
  color: var(--rim);
  background: var(--k-go);
  border-color: var(--rim);
}
.checks i svg {
  stroke-width: 3;
}

/* 10 quick start */
.start {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 34px;
}
.start-steps {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  counter-reset: s;
}
.start-steps li {
  counter-increment: s;
  padding: 16px 18px;
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--muted);
  background: var(--card);
  border: 2px solid var(--line);
  border-radius: 12px;
  box-shadow: 0 5px 0 var(--base);
}
.start-steps li::before {
  content: "0" counter(s);
  display: block;
  margin-bottom: 6px;
  font: 900 22px/1 var(--mono);
  color: transparent;
  -webkit-text-stroke: 1.5px var(--k-cmd);
}
.start-steps b {
  color: var(--ink);
}
.start-code {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
  min-width: 0;
}

/* Final */
.final {
  padding-bottom: 40px;
}
.final-inner {
  display: grid;
  justify-items: center;
  gap: 18px;
  padding-top: 60px;
  padding-bottom: 50px;
  text-align: center;
  border-top: 2px dashed var(--line);
}
.final-inner h2 {
  margin: 0;
  font-size: clamp(40px, 7vw, 80px);
}
.final-keys {
  justify-content: center;
  margin-top: 6px;
}
.final-links {
  margin: 10px 0 0;
  font: 12px var(--mono);
  color: var(--muted);
}

/* Quick start example page */
.qs-title {
  margin: 16px 0 18px;
  font-size: clamp(40px, 6vw, 72px);
}
.qs-top {
  margin-bottom: 34px;
}
.qs-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
}
.qs-stage {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  padding: 14px;
}
.qs-canvas {
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  border: 2px solid var(--rim);
  border-radius: 10px;
  background:
    linear-gradient(var(--grid) 1px, transparent 1px) 0 0 / 20px 20px,
    linear-gradient(90deg, var(--grid) 1px, transparent 1px) 0 0 / 20px 20px,
    var(--bg);
  cursor: crosshair;
}

/* 404 */
.lost-inner {
  display: grid;
  justify-items: center;
  gap: 18px;
  text-align: center;
}
.lost-inner h1 {
  font-size: clamp(36px, 6vw, 64px);
}
.lost-board {
  position: relative;
  width: min(100%, 420px);
  height: 170px;
  border: 2px solid var(--line);
  border-radius: 14px;
  background:
    linear-gradient(var(--grid) 1px, transparent 1px) 0 0 / 22px 22px,
    linear-gradient(90deg, var(--grid) 1px, transparent 1px) 0 0 / 22px 22px,
    var(--card);
  box-shadow: 0 6px 0 var(--base);
}
.lost-board {
  margin-bottom: 18px;
}
.lost-board .bui-sticker {
  top: 50%;
}

/* ---------- Responsive ---------- */
@media (max-width: 1080px) {
  .hero-grid {
    grid-template-columns: minmax(0, 1fr);
  }
  .demo-board {
    height: 320px;
  }
  .spec-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .pipeline {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .pipeline li:nth-child(4)::before {
    display: none;
  }
}
@media (max-width: 900px) {
  .rules {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .bricks,
  .games {
    grid-template-columns: minmax(0, 1fr);
  }
  .game.blitz {
    grid-row: auto;
  }
  .split {
    grid-template-columns: minmax(0, 1fr);
  }
  .split.flip > :first-child {
    order: 0;
  }
}
@media (max-width: 600px) {
  .rules,
  .pipeline,
  .start-steps,
  .game-facts {
    grid-template-columns: minmax(0, 1fr);
  }
  .pipeline li + li::before {
    left: 30px;
    top: -16px;
    width: 2px;
    height: 16px;
  }
  .pipeline li:nth-child(4)::before {
    display: block;
  }
  .demo-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .demo-board {
    height: 300px;
  }
  .phases li {
    grid-template-columns: minmax(0, 1fr);
  }
  .phases p {
    grid-column: 1;
    grid-row: auto;
    margin-top: 6px;
  }
  .stats-row {
    gap: 12px 22px;
  }
  .stats-row .soon {
    margin-left: 0;
  }
  .lead {
    font-size: 16.5px;
  }
  .code {
    font-size: 11.5px;
  }
  .game,
  .brick,
  .phase {
    padding: 18px;
  }
  .spec-card b {
    font-size: 26px;
  }
}
@media (max-width: 400px) {
  .spec-card {
    padding: 14px;
  }
  .demo-keys .bui-arcade kbd {
    display: none;
  }
}
@media (prefers-reduced-motion: reduce) {
  .blink,
  .phase[data-phase="now"] .phase-pill {
    animation: none;
  }
}

/* ---------- Byline, coming-soon tag, page profile ---------- */
.byline {
  margin: 10px 0 0;
  font: 700 13px var(--mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}
.byline a,
.site-foot p a,
.foot-base a {
  color: var(--ink);
}
.soon-tag {
  display: inline-block;
  padding: 1px 7px;
  font: 800 10px var(--mono);
  letter-spacing: 0.12em;
  color: var(--rim);
  background: var(--k-aim);
  border-radius: 5px;
}
.brick h3 a,
.brick h2 a {
  color: inherit;
  text-decoration: none;
}
.brick h3 a:hover code,
.brick h2 a:hover code {
  text-decoration: underline;
}
.brick h2 {
  margin: 0;
}
.brick h2 code {
  font-size: 20px;
  color: var(--ink);
}
.profile-card {
  display: grid;
  gap: 10px;
  padding: 24px;
  align-content: start;
}
.profile-size {
  font: 800 clamp(34px, 5vw, 52px) var(--mono);
  color: var(--ink);
}
.profile-card small {
  color: var(--muted);
}

/* ---------- Brick pages ---------- */
.bp-crumbs {
  margin-bottom: 18px;
  font: 12px var(--mono);
  color: var(--muted);
}
.bp-crumbs a {
  color: var(--ink);
}
.bp-title {
  margin: 14px 0 18px;
  font-size: clamp(32px, 5.4vw, 60px);
  overflow-wrap: anywhere;
}
.bp-title code {
  font-size: inherit;
  color: var(--ink);
}
.bp-top {
  margin-bottom: 30px;
}
.bp-sizes {
  display: grid;
  gap: 14px;
  align-content: start;
}
.bp-size {
  display: grid;
  gap: 6px;
  padding: 18px 20px;
}
.bp-bytes {
  font: 800 32px var(--mono);
  color: var(--ink);
}
.bp-size small,
.bp-note {
  font-size: 13.5px;
  color: var(--muted);
}
.bp-demo {
  margin: 0 0 30px;
  padding: 16px;
  display: grid;
  gap: 12px;
}
.bp-stage {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  min-width: 0;
}
.bd-canvas {
  display: block;
  width: 100%;
  height: auto;
  border: 2px solid var(--rim);
  border-radius: 10px;
  background: var(--code-bg);
  cursor: crosshair;
  touch-action: manipulation;
}
.bd-img {
  image-rendering: pixelated;
}
.bp-demo figcaption {
  display: grid;
  gap: 6px;
  font-size: 14px;
  color: var(--muted);
}
.bp-use {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  margin-bottom: 18px;
}
.bp-snippet {
  margin-bottom: 18px;
}
.bp-api {
  margin-top: 40px;
}
.bp-api h2 {
  margin: 0 0 6px;
}
.bp-toc {
  margin: 18px 0 26px;
  padding: 16px 20px;
}
.bp-toc ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 6px 18px;
}
.bp-toc li {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  min-width: 0;
  font-size: 13px;
}
.bp-toc a {
  overflow-wrap: anywhere;
}
.bp-toc small,
.bp-decl :is(h3, h4) small {
  font: 11px var(--mono);
  color: var(--muted);
}
.bp-mod {
  margin: 34px 0 6px;
}
.bp-decl {
  margin: 0 0 26px;
  min-width: 0;
  scroll-margin-top: 90px;
}
.bp-decl :is(h3, h4) {
  margin: 0 0 8px;
  font-size: 18px;
  overflow-wrap: anywhere;
}
.bp-decl p {
  margin: 0 0 10px;
  max-width: 78ch;
  line-height: 1.6;
}
.bp-steps {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin-top: 40px;
}
.bp-step {
  display: grid;
  gap: 4px;
  text-decoration: none;
  color: var(--ink);
}
.bp-step.next {
  text-align: right;
}
.bp-step small {
  font: 700 11px var(--mono);
  letter-spacing: 0.1em;
  color: var(--muted);
}
@media (max-width: 860px) {
  .bp-use {
    grid-template-columns: minmax(0, 1fr);
  }
}
.hero-layers {
  min-width: 0;
}
.bui .hero-cap {
  display: block;
  white-space: normal;
  margin-top: 12px;
  line-height: 1.6;
}
.hero-cap a {
  color: var(--k-sys-ink);
}
.fizz-slot {
  min-width: 0;
  min-height: 0;
  contain: none;
}
.fizz-slot figure.ae-slot {
  position: relative;
  margin: 0;
  width: 100%;
  aspect-ratio: 16 / 10;
  border: 2px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
  cursor: pointer;
  background: var(--code-bg);
}
.fizz-slot .fz-poster {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}