:root {
  color-scheme: light;
  --bg: #f7f7f2;
  --surface: #ffffff;
  --fg: #151511;
  --muted: #5f615b;
  --border: #151511;
  --accent: #ef3f2f;
  --acid: #b4f73b;
  --cyan: #40c7f4;
  --gold: #ffd64f;
  --violet: #ad63f7;
  --success: #45c97a;
  --danger: #ef3f2f;
  --font-display: "Times New Roman", "Iowan Old Style", Georgia, serif;
  --font-body: ui-monospace, "IBM Plex Mono", "JetBrains Mono", Menlo, monospace;
  --edge: 2px solid var(--border);
  --radius: 2px;
  --max: 1480px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  background:
    repeating-linear-gradient(90deg, rgba(21, 21, 17, 0.08) 0 1px, transparent 1px 72px),
    repeating-linear-gradient(0deg, rgba(21, 21, 17, 0.08) 0 1px, transparent 1px 72px),
    var(--bg);
  color: var(--fg);
  font-family: var(--font-body);
  line-height: 1.45;
  -webkit-font-smoothing: antialiased;
  text-rendering: geometricPrecision;
}

::selection {
  background: var(--acid);
  color: var(--fg);
}

a {
  color: inherit;
  text-decoration: none;
}

button,
input {
  font: inherit;
}

button {
  cursor: pointer;
}

button:focus-visible,
a:focus-visible,
input:focus-visible,
summary:focus-visible {
  outline: 3px solid var(--cyan);
  outline-offset: 3px;
}

[hidden] {
  display: none !important;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 16px;
  align-items: center;
  border-bottom: var(--edge);
  background: rgba(247, 247, 242, 0.95);
  backdrop-filter: blur(10px);
}

.brand,
.nav-links a,
.day-pill {
  min-height: 48px;
  display: inline-flex;
  align-items: center;
}

.brand {
  min-width: 0;
  gap: 12px;
  padding: 10px 18px;
  border-right: var(--edge);
  font-weight: 900;
  text-transform: uppercase;
}

.brand-mark {
  width: 38px;
  height: 38px;
  flex: 0 0 auto;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 5px;
  padding: 6px;
  border: var(--edge);
  background: var(--surface);
}

.brand-mark span {
  border-radius: 50%;
  background: var(--fg);
}

.brand-mark span:nth-child(1) {
  background: var(--cyan);
}

.brand-mark span:nth-child(2) {
  background: var(--acid);
}

.brand-mark span:nth-child(3) {
  background: var(--accent);
}

.brand-mark span:nth-child(4) {
  background: var(--gold);
}

.nav-links {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  min-width: 0;
}

.nav-links a,
.day-pill {
  padding: 10px 16px;
  border-left: var(--edge);
  color: var(--fg);
  font-size: 0.8rem;
  font-weight: 900;
  text-transform: uppercase;
  white-space: nowrap;
}

.nav-links a:hover {
  background: var(--fg);
  color: var(--surface);
}

.day-pill {
  background: var(--acid);
}

main {
  min-height: 100vh;
}

.play-surface,
.info-band,
.site-footer {
  width: min(100%, var(--max));
  margin: 0 auto;
  padding-inline: 20px;
}

.play-surface {
  padding-top: 28px;
  padding-bottom: 52px;
}

.info-band {
  padding-bottom: 52px;
}

.site-footer {
  padding-bottom: 34px;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(220px, 0.78fr) minmax(420px, 1.28fr) minmax(260px, 0.7fr);
  gap: 18px;
  align-items: stretch;
}

.intro-rail,
.game-panel,
.side-panel,
.info-card,
.faq-section,
.not-found-panel {
  border: var(--edge);
  border-radius: var(--radius);
  background: var(--surface);
}

.intro-rail {
  min-height: 720px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  overflow: hidden;
}

.intro-top {
  padding: 18px;
}

.eyebrow,
.small-label {
  margin: 0;
  font-size: 0.78rem;
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: 0;
  text-transform: uppercase;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  padding: 5px 8px;
  border: var(--edge);
  background: var(--accent);
  color: white;
}

h1,
h2,
h3,
p {
  overflow-wrap: break-word;
}

h1 {
  margin: 20px 0 0;
  font-family: var(--font-display);
  font-size: 5.8rem;
  font-weight: 900;
  line-height: 0.76;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1 span {
  display: block;
  overflow-wrap: normal;
  word-break: keep-all;
}

.lede {
  max-width: 44ch;
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 1rem;
  font-weight: 800;
}

.quick-rules {
  display: grid;
  border-top: var(--edge);
}

.quick-rules div {
  display: grid;
  grid-template-columns: 48px 1fr;
  min-height: 64px;
  border-bottom: var(--edge);
}

.quick-rules div:last-child {
  border-bottom: 0;
}

.quick-rules b {
  position: relative;
  display: grid;
  place-items: center;
  border-right: var(--edge);
  color: var(--fg);
  font-size: 0.78rem;
}

.quick-rules b::before {
  content: "";
  position: absolute;
  width: 7px;
  height: 7px;
  right: 8px;
  top: 8px;
  border: 1px solid var(--fg);
  border-radius: 50%;
  background: var(--rule-color, var(--acid));
}

.quick-rules div:nth-child(2) b {
  --rule-color: var(--cyan);
}

.quick-rules div:nth-child(3) b {
  --rule-color: var(--gold);
}

.quick-rules span {
  display: flex;
  align-items: center;
  padding: 10px 12px;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 800;
  text-transform: uppercase;
}

.challenge-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: var(--edge);
}

.challenge-strip span {
  min-height: 92px;
  border-right: var(--edge);
}

.challenge-strip span:last-child {
  border-right: 0;
}

.challenge-strip span:nth-child(1) {
  background: #ff7a1a;
}

.challenge-strip span:nth-child(2) {
  background: #19d6a3;
}

.challenge-strip span:nth-child(3) {
  background: #d93b8c;
}

.challenge-strip span:nth-child(4) {
  background: #2454d6;
}

.game-panel {
  min-height: 720px;
  display: grid;
  grid-template-rows: auto 1fr auto;
  overflow: hidden;
}

.game-topline {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-bottom: var(--edge);
}

.metric {
  min-height: 88px;
  padding: 12px;
  border-right: var(--edge);
  background: #f7ffe6;
}

.metric:last-child {
  border-right: 0;
}

.metric strong {
  display: block;
  margin-top: 8px;
  font-size: 1.45rem;
  line-height: 1;
  font-variant-numeric: tabular-nums;
}

.metric .small-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.metric .small-label::before {
  content: "";
  width: 10px;
  height: 10px;
  flex: 0 0 auto;
  border: 2px solid var(--fg);
  border-radius: 50%;
  background: var(--metric-icon, var(--surface));
}

.metric:nth-child(1) .small-label::before {
  --metric-icon: var(--accent);
}

.metric:nth-child(2) .small-label::before {
  --metric-icon: var(--acid);
}

.metric:nth-child(3) .small-label::before {
  --metric-icon: var(--cyan);
}

.metric:nth-child(4) .small-label::before {
  --metric-icon: var(--gold);
}

.prompt-stage {
  display: grid;
  grid-template-columns: minmax(180px, 280px) minmax(0, 1fr);
  min-height: 318px;
  border-bottom: var(--edge);
}

.memory-token {
  --answer: #ff7a1a;
  position: relative;
  min-height: 318px;
  border-right: var(--edge);
  background:
    radial-gradient(circle at 50% 44%, var(--answer) 0 72px, transparent 73px),
    linear-gradient(135deg, rgba(21, 21, 17, 0.08), transparent),
    #f7f7f2;
  overflow: hidden;
  isolation: isolate;
}

.memory-token::before,
.memory-token::after {
  content: "";
  position: absolute;
  left: 50%;
  border: var(--edge);
  transform: translateX(-50%);
}

.memory-token::before {
  width: min(58%, 150px);
  aspect-ratio: 1;
  top: calc(44% - 75px);
  border-radius: 50%;
  background: color-mix(in srgb, var(--answer) 80%, white);
  z-index: -1;
}

.memory-token::after {
  width: 46px;
  height: 8px;
  top: calc(44% + 94px);
  border: 0;
  background: var(--fg);
  z-index: 2;
}

.token-label {
  position: absolute;
  right: 10px;
  bottom: 10px;
  z-index: 4;
  max-width: 78%;
  padding: 6px 8px;
  border: var(--edge);
  background: var(--surface);
  color: var(--fg);
  font-size: 0.72rem;
  font-weight: 900;
  text-transform: uppercase;
}

.prompt-copy {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 28px;
}

.prompt-copy h2 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-size: clamp(2.35rem, 4.6vw, 3.65rem);
  font-weight: 900;
  line-height: 0.94;
  overflow-wrap: normal;
  word-break: normal;
  text-transform: uppercase;
}

.prompt-copy p:last-child {
  max-width: 42ch;
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 1rem;
  font-weight: 800;
}

.swatch-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-bottom: var(--edge);
}

.swatch-button {
  min-height: 152px;
  display: grid;
  grid-template-columns: 86px minmax(0, 1fr);
  gap: 14px;
  align-items: center;
  padding: 14px;
  border: 0;
  border-right: var(--edge);
  border-bottom: var(--edge);
  background: var(--surface);
  color: var(--fg);
  text-align: left;
  transition: background 120ms ease, color 120ms ease, transform 120ms ease, box-shadow 120ms ease;
}

.swatch-button:nth-child(2n) {
  border-right: 0;
}

.swatch-button:nth-last-child(-n + 2) {
  border-bottom: 0;
}

.swatch-button:hover:not(:disabled) {
  background: var(--fg);
  color: var(--surface);
  transform: translate(-2px, -2px);
  box-shadow: 4px 4px 0 var(--fg);
}

.swatch-button:disabled {
  cursor: default;
}

.swatch-chip {
  position: relative;
  width: 86px;
  aspect-ratio: 1;
  border: var(--edge);
  background: var(--chip);
  overflow: hidden;
}

.swatch-chip::before,
.swatch-chip::after {
  content: "";
  position: absolute;
}

.swatch-chip::before {
  width: 18px;
  height: 18px;
  right: 10px;
  top: 10px;
  border: 2px solid rgba(255, 255, 255, 0.76);
  border-radius: 50%;
}

.swatch-chip::after {
  width: 34px;
  height: 2px;
  left: 12px;
  bottom: 13px;
  background: rgba(255, 255, 255, 0.76);
}

.swatch-name {
  display: block;
  font-size: 1.05rem;
  font-weight: 900;
  line-height: 1.1;
  text-transform: uppercase;
}

.swatch-code {
  display: block;
  margin-top: 10px;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 900;
  text-transform: uppercase;
}

.swatch-button:hover .swatch-code {
  color: #bfefff;
}

.swatch-button.is-correct {
  background: var(--success);
  color: var(--fg);
}

.swatch-button.is-wrong {
  background: var(--danger);
  color: var(--surface);
}

.game-footer {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  min-height: 84px;
}

.feedback-copy {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 14px 18px;
}

.feedback-copy strong {
  display: block;
  margin-bottom: 4px;
  font-size: 1rem;
  text-transform: uppercase;
}

.feedback-copy p {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 900;
  text-transform: uppercase;
}

.primary-button,
.secondary-button,
.ghost-button,
.mini-button {
  border: var(--edge);
  border-radius: 0;
  background: var(--fg);
  color: var(--surface);
  font-weight: 900;
  text-transform: uppercase;
  transition: transform 120ms ease, background 120ms ease, color 120ms ease, box-shadow 120ms ease;
}

.primary-button:hover:not(:disabled),
.secondary-button:hover:not(:disabled),
.ghost-button:hover:not(:disabled),
.mini-button:hover:not(:disabled) {
  transform: translate(-2px, -2px);
  box-shadow: 4px 4px 0 var(--fg);
}

.primary-button {
  min-width: 168px;
  border-top: 0;
  border-right: 0;
  border-bottom: 0;
  padding: 0 24px;
  background: var(--accent);
}

.secondary-button {
  width: 100%;
  min-height: 48px;
  margin-top: 10px;
  background: var(--acid);
  color: var(--fg);
}

.ghost-button {
  width: 100%;
  min-height: 48px;
  margin-top: 10px;
  background: var(--surface);
  color: var(--fg);
}

.mini-button {
  min-height: 46px;
  padding: 0 14px;
}

.primary-button:disabled,
.secondary-button:disabled,
.ghost-button:disabled,
.mini-button:disabled {
  cursor: not-allowed;
  opacity: 0.62;
}

.side-panel {
  min-height: 720px;
  display: grid;
  align-content: start;
  overflow: hidden;
}

.panel-block {
  padding: 16px;
  border-bottom: var(--edge);
}

.panel-block:last-child {
  border-bottom: 0;
}

.panel-block h2,
.info-card h2,
.faq-section h2 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-size: 2.05rem;
  line-height: 0.95;
  text-transform: uppercase;
}

.panel-block p,
.info-card p,
.faq-section p {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 0.88rem;
  font-weight: 800;
}

.result-score {
  display: flex;
  align-items: end;
  gap: 8px;
  margin-top: 12px;
  font-family: var(--font-display);
  font-size: 5rem;
  font-weight: 900;
  line-height: 0.85;
}

.result-score span {
  font-family: var(--font-body);
  font-size: 0.8rem;
  text-transform: uppercase;
}

.name-row,
.wall-form {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 8px;
  margin-top: 14px;
}

.name-row label {
  grid-column: 1 / -1;
  color: var(--muted);
  font-size: 0.75rem;
  font-weight: 900;
  text-transform: uppercase;
}

input {
  width: 100%;
  min-height: 46px;
  border: var(--edge);
  border-radius: 0;
  background: var(--surface);
  color: var(--fg);
  padding: 10px 12px;
  font-weight: 900;
}

.block-heading {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 10px;
}

.text-button {
  min-height: 32px;
  border: 0;
  border-bottom: var(--edge);
  background: transparent;
  color: var(--fg);
  font-size: 0.75rem;
  font-weight: 900;
  text-transform: uppercase;
}

.leaderboard,
.wall-list {
  display: grid;
  gap: 8px;
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
}

.leaderboard li,
.wall-list li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 8px;
  align-items: center;
  min-height: 42px;
  padding: 8px;
  border: var(--edge);
  background: var(--surface);
  font-size: 0.78rem;
  font-weight: 900;
  text-transform: uppercase;
}

.wall-list li {
  grid-template-columns: 1fr;
  color: var(--muted);
}

.rank-badge {
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  border: 2px solid var(--fg);
  background: var(--fg);
  color: var(--surface);
  font-size: 0.72rem;
}

.score-badge {
  padding: 4px 6px;
  border: var(--edge);
  background: var(--gold);
  color: var(--fg);
}

.info-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.info-card {
  min-height: 240px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 18px;
}

.info-card:nth-child(2) {
  background: var(--fg);
  color: var(--surface);
}

.info-card:nth-child(2) p {
  color: #d6f4ff;
}

.info-card:nth-child(2) .eyebrow {
  border-color: var(--surface);
  background: var(--cyan);
  color: var(--fg);
}

.faq-section {
  margin-top: 18px;
  padding: 18px;
}

.faq-section > h2 {
  max-width: 760px;
  font-size: 3.6rem;
}

details {
  border-top: var(--edge);
}

details:last-child {
  border-bottom: var(--edge);
}

summary {
  min-height: 64px;
  display: flex;
  align-items: center;
  color: var(--fg);
  font-weight: 900;
  text-transform: uppercase;
  cursor: pointer;
}

details p {
  max-width: 76ch;
  margin: 0 0 18px;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  border: var(--edge);
  background: var(--fg);
  color: var(--surface);
  padding: 14px 16px;
  font-size: 0.8rem;
  font-weight: 900;
  text-transform: uppercase;
}

.ticker {
  display: inline-flex;
  gap: 10px;
  align-items: center;
}

.ticker::before {
  content: "";
  width: 12px;
  height: 12px;
  flex: 0 0 auto;
  border: 1px solid var(--surface);
  background: var(--acid);
}

.not-found {
  display: grid;
  min-height: 100vh;
  place-items: center;
  padding: 24px;
}

.not-found-panel {
  width: min(100%, 720px);
  padding: clamp(22px, 5vw, 42px);
}

.not-found h1 {
  font-size: clamp(3rem, 8vw, 5rem);
  line-height: 0.88;
}

.home-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  margin-top: 22px;
  padding: 0 18px;
  border: var(--edge);
  background: var(--fg);
  color: var(--surface);
  font-weight: 900;
  text-transform: uppercase;
}

@media (max-width: 1260px) {
  .hero-grid {
    grid-template-columns: minmax(280px, 0.76fr) minmax(460px, 1.24fr);
  }

  .side-panel {
    grid-column: 1 / -1;
    min-height: 0;
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .panel-block {
    border-right: var(--edge);
    border-bottom: 0;
  }

  .panel-block:last-child {
    border-right: 0;
  }
}

@media (max-width: 960px) {
  .site-header {
    grid-template-columns: 1fr;
  }

  .brand {
    border-right: 0;
    border-bottom: var(--edge);
  }

  .nav-links {
    justify-content: stretch;
  }

  .nav-links a,
  .day-pill {
    flex: 1;
    justify-content: center;
    border-left: 0;
    border-right: var(--edge);
  }

  .nav-links > *:last-child {
    border-right: 0;
  }

  .hero-grid {
    grid-template-columns: 1fr;
  }

  .game-panel {
    order: 1;
  }

  .intro-rail {
    order: 2;
  }

  .side-panel {
    order: 3;
  }

  .intro-rail,
  .game-panel,
  .side-panel {
    min-height: 0;
  }

  h1 {
    font-size: 5.1rem;
  }

  .intro-rail {
    display: grid;
    grid-template-columns: 1fr 180px;
  }

  .quick-rules {
    border-top: 0;
    border-left: var(--edge);
  }

  .challenge-strip {
    grid-column: 1 / -1;
  }

  .side-panel {
    grid-template-columns: 1fr;
  }

  .panel-block {
    border-right: 0;
    border-bottom: var(--edge);
  }

  .info-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  .play-surface,
  .info-band,
  .site-footer {
    padding-left: 12px;
    padding-right: 12px;
  }

  .nav-links {
    overflow-x: visible;
    justify-content: flex-start;
  }

  .nav-links a,
  .day-pill {
    flex: 1 1 0;
    min-width: 0;
    padding: 10px 8px;
    font-size: 0.72rem;
  }

  .intro-rail {
    grid-template-columns: 1fr;
  }

  h1 {
    font-size: 4.1rem;
  }

  .quick-rules {
    border-left: 0;
    border-top: var(--edge);
  }

  .game-topline {
    grid-template-columns: repeat(2, 1fr);
  }

  .metric:nth-child(2n) {
    border-right: 0;
  }

  .metric:nth-child(-n + 2) {
    border-bottom: var(--edge);
  }

  .prompt-stage {
    grid-template-columns: 1fr;
  }

  .memory-token {
    min-height: 220px;
    border-right: 0;
    border-bottom: var(--edge);
  }

  .prompt-copy {
    padding: 20px;
  }

  .swatch-grid {
    grid-template-columns: 1fr;
  }

  .swatch-button,
  .swatch-button:nth-child(2n),
  .swatch-button:nth-last-child(-n + 2) {
    min-height: 112px;
    grid-template-columns: 72px minmax(0, 1fr);
    border-right: 0;
    border-bottom: var(--edge);
  }

  .swatch-button:last-child {
    border-bottom: 0;
  }

  .swatch-chip {
    width: 72px;
  }

  .game-footer {
    grid-template-columns: 1fr;
  }

  .primary-button {
    min-height: 56px;
    border-left: 0;
    border-top: var(--edge);
  }

  .faq-section > h2 {
    font-size: 2.7rem;
  }

  .footer-inner {
    flex-direction: column;
  }
}

@media (max-width: 430px) {
  .play-surface {
    padding-top: 16px;
  }

  h1 {
    font-size: 3.3rem;
  }

  .intro-top {
    padding: 14px;
  }

  .prompt-copy h2 {
    font-size: 2.25rem;
  }

  .result-score {
    font-size: 4rem;
  }

  .game-topline {
    grid-template-columns: 1fr;
  }

  .metric {
    min-height: 68px;
    border-right: 0;
    border-bottom: var(--edge);
  }

  .metric:last-child {
    border-bottom: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}