:root {
  --ink: #0b0b0b;
  --paper: #f4f2ec;
  --paper-2: #e7e4db;
  --paper-3: #ffffff;
  --mute: #6f6c64;
  --line: #0b0b0b;

  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 48px;

  --text-kicker: 12px;
  --text-ui: 14px;
  --text-body: 16px;
  --text-display-sm: 32px;
  --text-display: 56px;
  --text-display-xl: 80px;
  --text-eq: 64px;

  --page-max: 1120px;
  --play-max: 720px;
  --logo: 44px;
  --btn-h: 44px;
  --key-h: 56px;
  --shadow: 4px 4px 0 0 #0b0b0b;
  --shadow-sm: 4px 4px 0 0 #0b0b0b;
  --safe-t: env(safe-area-inset-top, 0px);
  --safe-b: env(safe-area-inset-bottom, 0px);
  --safe-l: env(safe-area-inset-left, 0px);
  --safe-r: env(safe-area-inset-right, 0px);
}

* {
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

[x-cloak] {
  display: none !important;
}

html,
body {
  background: var(--paper);
  color: var(--ink);
}

body {
  margin: 0;
  min-height: 100dvh;
  font-family: Outfit, ui-sans-serif, system-ui, sans-serif;
  font-size: var(--text-body);
  line-height: 1.5;
  padding-left: var(--safe-l);
  padding-right: var(--safe-r);
}

::selection {
  background: var(--ink);
  color: var(--paper);
}

a {
  color: inherit;
}

.arena-bg {
  background-color: var(--paper);
  background-image:
    linear-gradient(to right, rgba(11, 11, 11, 0.045) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(11, 11, 11, 0.045) 1px, transparent 1px);
  background-size: 32px 32px;
}

.arena-bg::before {
  content: "";
  pointer-events: none;
  position: fixed;
  inset: 0;
  background:
    radial-gradient(circle at 0 0, transparent 18px, var(--ink) 18px, var(--ink) 19px, transparent 19px),
    radial-gradient(circle at 100% 0, transparent 18px, var(--ink) 18px, var(--ink) 19px, transparent 19px),
    radial-gradient(circle at 0 100%, transparent 18px, var(--ink) 18px, var(--ink) 19px, transparent 19px),
    radial-gradient(circle at 100% 100%, transparent 18px, var(--ink) 18px, var(--ink) 19px, transparent 19px);
  opacity: 0.35;
  z-index: 0;
}

.page {
  position: relative;
  z-index: 1;
  width: min(var(--page-max), 100%);
  margin-inline: auto;
  padding-inline: var(--space-2);
}

@media (min-width: 768px) {
  .page {
    padding-inline: var(--space-3);
  }
}

.page.is-play {
  width: min(var(--play-max), 100%);
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
}

.page.is-play .site-header {
  padding-top: calc(var(--space-2) + var(--safe-t));
  padding-bottom: var(--space-2);
}

.page.is-play .brand .kicker {
  max-width: min(48vw, 280px);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.cluster {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.cluster-sm {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.cluster-between {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
}

.stack {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.stack-lg {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.stack-tight {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.section-head {
  margin-bottom: var(--space-3);
}

.stars-center {
  justify-content: center;
}

.lede {
  margin: 0;
  font-size: var(--text-body);
}

.body-full {
  max-width: none;
}

.max-copy {
  max-width: 480px;
}

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

.align-end {
  text-align: right;
}

.hidden {
  display: none !important;
}

.wordmark {
  font-family: Oswald, sans-serif;
  font-size: var(--text-ui);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  line-height: 1.2;
}

.display {
  font-family: Oswald, sans-serif;
  font-size: var(--text-display);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  line-height: 0.9;
  margin: 0;
}

.display-sm {
  font-family: Oswald, sans-serif;
  font-size: var(--text-display-sm);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  line-height: 0.95;
  margin: 0;
}

.display-xl {
  font-family: Oswald, sans-serif;
  font-size: clamp(56px, 12vw, var(--text-display-xl));
  text-transform: uppercase;
  letter-spacing: 0.04em;
  line-height: 0.85;
  margin: 0;
}

.mono {
  font-family: "JetBrains Mono", ui-monospace, monospace;
  font-size: var(--text-ui);
  letter-spacing: 0.08em;
}

.body-mute {
  margin: 0;
  color: var(--mute);
  font-size: var(--text-body);
  max-width: 360px;
}

.kicker {
  margin: 0;
  font-family: "JetBrains Mono", ui-monospace, monospace;
  font-size: var(--text-kicker);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--mute);
}

.rule {
  height: 2px;
  background: var(--ink);
  border: 0;
  margin: 0;
}

.panel,
.panel-flat,
.card-link,
.stat-box,
.hud-item,
.eq-stage,
.drawer {
  background: var(--paper-3);
  border: 2px solid var(--line);
}

.panel,
.card-link,
.eq-stage,
.drawer,
.stat-box {
  box-shadow: var(--shadow);
}

.pad {
  padding: var(--space-3);
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  padding-top: calc(var(--space-3) + var(--safe-t));
  padding-bottom: var(--space-3);
}

.nav-left,
.nav-right {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.nav-left {
  min-width: 0;
  flex: 1;
}

.icon-btn {
  appearance: none;
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  min-width: var(--logo);
  height: auto;
  padding: 6px var(--space-1);
  border: 2px solid var(--ink);
  background: var(--paper-3);
  color: var(--ink);
  box-shadow: var(--shadow);
  text-decoration: none;
  cursor: pointer;
  font-family: "JetBrains Mono", ui-monospace, monospace;
  font-size: 9px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  line-height: 1;
}

.icon-btn svg {
  width: 20px;
  height: 20px;
  display: block;
}

.icon-btn:hover {
  background: var(--ink);
  color: var(--paper);
}

.icon-btn[data-on="0"] {
  opacity: 0.5;
}

.crumbs {
  display: flex;
  align-items: center;
  flex-wrap: nowrap;
  gap: var(--space-1);
  min-width: 0;
  overflow-x: auto;
}

.crumbs a,
.crumbs .is-here {
  font-family: Oswald, sans-serif;
  font-size: var(--text-ui);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--ink);
}

.crumbs a {
  border-bottom: 2px solid var(--ink);
}

.crumbs .is-here {
  font-weight: 700;
}

.crumb-sep {
  color: var(--mute);
  font-family: Oswald, sans-serif;
}

.card-glyph {
  width: 48px;
  height: 48px;
  border: 2px solid var(--ink);
  display: grid;
  place-items: center;
  flex-shrink: 0;
}

.card-glyph svg {
  width: 26px;
  height: 26px;
}

.btn-svg {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
}

.btn-svg svg {
  width: 16px;
  height: 16px;
}

.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  padding-top: var(--space-3);
  padding-bottom: calc(var(--space-4) + var(--safe-b));
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
}

.brand-mark {
  width: var(--logo);
  height: var(--logo);
  display: grid;
  place-items: center;
  border: 2px solid var(--line);
  background: var(--paper-3);
  font-family: Oswald, sans-serif;
  font-size: var(--text-ui);
  letter-spacing: 0.08em;
}

.page-hero {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding-bottom: var(--space-4);
}

.page-hero-row {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

@media (min-width: 768px) {
  .page-hero-row {
    flex-direction: row;
    align-items: flex-end;
    justify-content: space-between;
  }

  .page-hero-row .body-mute {
    text-align: right;
  }
}

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

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

.grid-2 {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2);
}

.grid-3 {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2);
}

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

@media (min-width: 768px) {
  .grid-2,
  .grid-3,
  .level-grid {
    gap: var(--space-3);
  }

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

  .grid-3 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .level-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 1024px) {
  .grid-3 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.chip {
  display: inline-flex;
  align-items: center;
  border: 2px solid var(--line);
  padding: 2px var(--space-1);
  font-family: "JetBrains Mono", ui-monospace, monospace;
  font-size: var(--text-kicker);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  background: var(--paper);
}

.chip-fill {
  background: var(--ink);
  color: var(--paper);
}

.pinstripe {
  display: flex;
  gap: 4px;
  height: 16px;
}

.pinstripe span {
  width: 4px;
  background: var(--ink);
}

.pinstripe span:nth-child(2) {
  opacity: 0.45;
}

.pinstripe span:nth-child(3) {
  opacity: 0.2;
}

.btn {
  appearance: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: var(--btn-h);
  padding: 0 var(--space-3);
  border: 2px solid var(--line);
  background: var(--paper-3);
  color: var(--ink);
  font-family: Oswald, sans-serif;
  font-size: var(--text-ui);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  text-decoration: none;
  box-shadow: var(--shadow-sm);
  cursor: pointer;
  transition: transform 80ms ease, box-shadow 80ms ease, background 80ms ease, color 80ms ease;
}

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

.btn:active {
  transform: translate(4px, 4px);
  box-shadow: none;
}

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

.btn-fill:hover {
  background: var(--paper-3);
  color: var(--ink);
}

.btn:disabled {
  opacity: 0.35;
  pointer-events: none;
}

.card-link {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding: var(--space-3);
  text-decoration: none;
  color: inherit;
  cursor: pointer;
  transition: transform 120ms ease, box-shadow 120ms ease;
}

.card-link:hover {
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0 0 var(--ink);
}

.card-link.is-locked {
  opacity: 0.55;
  box-shadow: none;
  background: var(--paper-2);
  pointer-events: none;
}

.card-link.is-locked:hover {
  transform: none;
}

.stat-box,
.hud-item {
  padding: var(--space-2);
}

.stat-value {
  font-family: Oswald, sans-serif;
  font-size: var(--text-display-sm);
  letter-spacing: 0.04em;
  margin: var(--space-1) 0 0;
}

.corner-frame {
  position: relative;
}

.corner-frame::before,
.corner-frame::after {
  content: "";
  position: absolute;
  width: 16px;
  height: 16px;
  border: 2px solid var(--ink);
  pointer-events: none;
}

.corner-frame::before {
  top: -2px;
  left: -2px;
  border-right: 0;
  border-bottom: 0;
}

.corner-frame::after {
  right: -2px;
  bottom: -2px;
  border-left: 0;
  border-top: 0;
}

.progress-track {
  height: 8px;
  background: var(--paper-2);
  border: 2px solid var(--ink);
  box-shadow: var(--shadow);
  flex-shrink: 0;
}

.progress-fill {
  height: 100%;
  background: var(--ink);
  width: 0%;
  transition: width 240ms ease;
}

.stars {
  display: flex;
  gap: var(--space-1);
}

.star {
  width: 10px;
  height: 10px;
  border: 2px solid var(--ink);
  background: transparent;
}

.star.is-on {
  background: var(--ink);
}

.eq-stage {
  flex: 0 0 auto;
  min-height: 0;
  padding: var(--space-3);
  display: flex;
  justify-content: flex-end;
  align-items: center;
  box-shadow: var(--shadow);
}

.eq-board {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  width: max-content;
  min-width: 4.5ch;
  margin-left: auto;
  margin-right: 0;
  text-align: right;
}

.eq-row {
  display: grid;
  grid-template-columns: 1.1em auto;
  column-gap: var(--space-2);
  align-items: end;
  justify-content: end;
}

.eq-num {
  font-family: Oswald, sans-serif;
  font-size: clamp(40px, 9vw, var(--text-eq));
  line-height: 0.9;
  letter-spacing: 0.02em;
  text-align: right;
  font-variant-numeric: tabular-nums;
}

.eq-op {
  font-family: Oswald, sans-serif;
  font-size: clamp(28px, 7vw, 40px);
  line-height: 0.9;
  text-align: center;
}

.eq-sum {
  border-top: 2px solid var(--ink);
  padding-top: var(--space-1);
}

.answer-tape {
  font-family: "JetBrains Mono", ui-monospace, monospace;
  font-size: clamp(28px, 7vw, 40px);
  letter-spacing: 0.08em;
  line-height: 1.1;
  min-height: 1.1em;
  border-bottom: 2px solid var(--ink);
  text-align: right;
  color: var(--ink);
  padding: 0;
}

.answer-tape.is-ok {
  background: var(--ink);
  color: var(--paper);
  border-bottom-color: var(--ink);
}

.answer-tape.is-bad {
  animation: shake 280ms ease;
}

.play-body {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  width: 100%;
  padding-right: 4px;
  padding-bottom: calc(var(--space-3) + var(--safe-b) + 4px);
}

.hud-grid,
.keypad {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-2);
  width: 100%;
  flex-shrink: 0;
}

.hud-item {
  padding: var(--space-2);
  box-shadow: var(--shadow);
  min-width: 0;
}

.key {
  height: clamp(48px, 8dvh, 64px);
  min-height: 48px;
  border: 2px solid var(--ink);
  background: var(--paper-3);
  color: var(--ink);
  font-family: Oswald, sans-serif;
  font-size: clamp(22px, 5vw, var(--text-display-sm));
  letter-spacing: 0.08em;
  box-shadow: var(--shadow);
  touch-action: manipulation;
  user-select: none;
  cursor: pointer;
}

.key:active {
  transform: translate(4px, 4px);
  box-shadow: none;
  background: var(--paper-2);
  color: var(--ink);
}

@media (hover: hover) {
  .key:hover {
    background: var(--paper-2);
    color: var(--ink);
  }
}

.key.key-go {
  grid-column: 1 / -1;
  height: clamp(48px, 7dvh, 56px);
  font-size: var(--text-ui);
  letter-spacing: 0.14em;
  background: var(--ink);
  color: var(--paper);
}

.key.key-go:hover,
.key.key-go:active {
  background: var(--ink);
  color: var(--paper);
}

.key.key-go:disabled {
  opacity: 0.35;
  pointer-events: none;
}

@media (min-width: 768px) {
  .play-body {
    gap: var(--space-2);
  }

  .key {
    height: 56px;
    font-size: 28px;
  }

  .key.key-go {
    height: 56px;
  }

  .eq-num {
    font-size: var(--text-eq);
  }
}

@media (min-width: 1024px) {
  .key {
    height: 64px;
    font-size: 32px;
  }
}

.overlay {
  position: fixed;
  inset: 0;
  background: var(--paper);
  z-index: 50;
  display: grid;
  place-items: center;
  padding: var(--space-3);
  padding-bottom: calc(var(--space-3) + var(--safe-b));
  overflow: auto;
}

.drawer {
  position: relative;
  width: min(440px, 100%);
  max-height: calc(100dvh - 48px);
  overflow: auto;
  padding: var(--space-3);
  padding-top: calc(var(--space-3) + 8px);
  padding-bottom: calc(var(--space-3) + 8px);
  text-align: center;
}

.drawer .body-mute {
  margin-inline: auto;
}

.drawer-close {
  position: absolute;
  top: var(--space-2);
  right: var(--space-2);
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  border: 2px solid var(--ink);
  background: var(--paper-3);
  color: var(--ink);
  box-shadow: var(--shadow-sm);
  text-decoration: none;
}

.drawer-close svg {
  width: 16px;
  height: 16px;
  display: block;
}

.drawer-close:hover {
  background: var(--ink);
  color: var(--paper);
}

.install-bar {
  position: sticky;
  top: 0;
  z-index: 40;
  background: var(--ink);
  color: var(--paper);
}

.install-bar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-2);
  padding-block: var(--space-2);
}

.list {
  margin: 0;
  padding-left: var(--space-3);
  color: var(--mute);
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.actions {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding-right: 4px;
  padding-bottom: 4px;
}

.actions .btn {
  width: 100%;
}

.actions.is-stack {
  flex-direction: column;
}

.actions.is-stack .btn {
  width: 100%;
  min-width: 0;
}

.btn-back {
  gap: var(--space-1);
}

.btn-back svg {
  width: 16px;
  height: 16px;
  display: block;
  flex-shrink: 0;
}

@media (min-width: 640px) {
  .actions:not(.is-stack) {
    flex-direction: row;
    justify-content: center;
  }

  .actions:not(.is-stack) .btn {
    width: auto;
    min-width: 160px;
  }
}

.eq-wrap {
  width: max-content;
  margin: 0 auto;
}

.eq-line {
  display: grid;
  grid-template-columns: 1.1em auto;
  column-gap: var(--space-2);
  align-items: end;
  justify-content: end;
}

.mode-symbol {
  font-family: Oswald, sans-serif;
  font-size: var(--text-display-sm);
  line-height: 1;
}

@keyframes shake {
  0%,
  100% { transform: translateX(0); }
  25% { transform: translateX(-6px); }
  75% { transform: translateX(6px); }
}

@keyframes enter {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.enter {
  animation: enter 280ms ease both;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }
}

.page.is-play.is-zip {
  flex: 1 1 auto;
  min-height: 0;
  height: auto;
  overflow: hidden;
}

body:has(.page.is-zip) {
  height: 100dvh;
  max-height: 100dvh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.page.is-zip .site-header {
  padding-bottom: var(--space-2);
  flex-shrink: 0;
}

.zip-play-body {
  flex: 1 1 auto;
  min-height: 0;
  overflow: hidden;
  padding-inline: var(--space-3);
  padding-top: var(--space-1);
  padding-bottom: calc(var(--space-2) + var(--safe-b) + 12px);
  overscroll-behavior: none;
}

.zip-stage {
  flex: 1 1 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-2);
  min-height: 0;
  container-type: size;
}

.zip-board {
  --n: 6;
  position: relative;
  width: min(100%, 480px);
  max-height: 100%;
  aspect-ratio: 1;
  overflow: hidden;
  cursor: pointer;
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
  -webkit-touch-callout: none;
}

@supports (width: 1cqh) {
  .zip-board {
    width: min(100cqw, 100cqh, 480px);
    max-height: none;
  }
}

.zip-grid {
  display: grid;
  grid-template-columns: repeat(var(--n), minmax(0, 1fr));
  grid-template-rows: repeat(var(--n), minmax(0, 1fr));
  width: 100%;
  height: 100%;
  border: 2px solid var(--ink);
  background: var(--paper-3);
  box-shadow: var(--shadow);
}

.zip-cell {
  position: relative;
  z-index: 1;
  border: 1px solid var(--ink);
  display: grid;
  place-items: center;
  background: var(--paper-3);
  min-width: 0;
  min-height: 0;
}

.zip-cell.is-path {
  background: var(--paper-2);
}

.zip-cell.is-head {
  background: var(--paper-2);
}

.zip-lines {
  position: absolute;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  color: var(--ink);
}

.zip-walls {
  position: absolute;
  inset: 0;
  z-index: 3;
  pointer-events: none;
}

.zip-nums {
  position: absolute;
  inset: 2px;
  z-index: 5;
  display: grid;
  grid-template-columns: repeat(var(--n), minmax(0, 1fr));
  grid-template-rows: repeat(var(--n), minmax(0, 1fr));
  pointer-events: none;
}

.zip-num-cell,
.zip-num {
  pointer-events: none;
}

.zip-num-cell {
  display: grid;
  place-items: center;
  min-width: 0;
  min-height: 0;
}

.zip-num {
  width: min(70%, 40px);
  aspect-ratio: 1;
  border: 2px solid var(--ink);
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-family: Oswald, sans-serif;
  font-size: clamp(11px, 2.8vw, 18px);
  letter-spacing: 0;
  line-height: 1;
  background: var(--paper-3);
  color: var(--ink);
  box-shadow: 0 0 0 3px var(--paper-3);
}

.zip-wall {
  position: absolute;
  background: var(--ink);
  border-radius: 2px;
}

.zip-dock {
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding-top: var(--space-2);
}

.zip-tools {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-2);
  width: 100%;
}

.zip-tools .btn {
  width: 100%;
  min-height: 48px;
}

.zip-fill {
  text-align: center;
  color: var(--mute);
  margin: 0;
}

@media (max-width: 767px) {
  .zip-stage {
    padding: var(--space-2) var(--space-1);
  }

  .zip-play-body {
    padding-inline: var(--space-2);
  }
}

.offline-screen {
  min-height: 100dvh;
  display: grid;
  place-items: center;
  padding: var(--space-3);
}

.tall {
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
}

.tall-main {
  flex: 1;
}