:root {
  color-scheme: light;
  --page: #edf3f8;
  --page-glow: rgb(57 183 223 / 12%);
  --ink: #111820;
  --muted: #5e6975;
  --dim: #79838d;
  --surface: #ffffff;
  --surface-2: #e4ebf1;
  --surface-3: #d4dde5;
  --line: #aeb9c4;
  --line-strong: #7f8c99;
  --cyan: #008fba;
  --cyan-bright: #16bdea;
  --cyan-soft: #d8f2fa;
  --orange: #d66b17;
  --orange-bright: #f38a35;
  --orange-soft: #fff0e1;
  --green: #538d4e;
  --yellow: #b59f3b;
  --absent: #6b7076;
  --tile-neutral: #ffffff;
  --tile-border: #9aa6b1;
  --key-neutral: #d5dbe0;
  --key-ink: #13181d;
  --key-border: #c0c8cf;
  --key-absent: #72777d;
  --danger: #b92836;
  --modal-backdrop: rgb(14 24 34 / 62%);
  --tile-size: 58px;
  --tile-gap: 7px;
  --board-pad: 8px;
  --rail-width: 72px;
  --rail-overlap: 19px;
  --board-zone-height: 390px;
  font-family: "Avenir Next", Avenir, "Segoe UI", system-ui, sans-serif;
  font-synthesis: none;
}

html[data-theme="dark"] {
  color-scheme: dark;
  --page: #030a13;
  --page-glow: rgb(20 120 175 / 16%);
  --ink: #f7f8fa;
  --muted: #aab2bd;
  --dim: #818c98;
  --surface: #101a26;
  --surface-2: #182534;
  --surface-3: #273442;
  --line: #394654;
  --line-strong: #64707d;
  --cyan: #50d9ff;
  --cyan-bright: #50d9ff;
  --cyan-soft: #12313d;
  --orange: #ff9b48;
  --orange-bright: #ff9b48;
  --orange-soft: #382719;
  --absent: #3a3a3c;
  --tile-neutral: #18222d;
  --tile-border: #68727d;
  --key-neutral: #d3d6da;
  --key-ink: #16191d;
  --key-border: #e5e7e9;
  --key-absent: #565758;
  --danger: #f46e76;
  --modal-backdrop: rgb(0 5 12 / 82%);
}

* { box-sizing: border-box; }
html { min-height: 100%; background: var(--page); }
body {
  margin: 0;
  min-width: 320px;
  min-height: 100%;
  color: var(--ink);
  background: radial-gradient(circle at 50% -9rem, var(--page-glow), transparent 32rem), var(--page);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
button { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
button:focus-visible, a:focus-visible { outline: 3px solid #efc84a; outline-offset: 3px; }
[hidden] { display: none !important; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }
.skip-link { position: fixed; left: 1rem; top: -5rem; z-index: 100; padding: .7rem 1rem; color: #10141a; background: #fff; border-radius: .35rem; font-weight: 800; }
.skip-link:focus { top: 1rem; }

.page-shell { width: min(100%, 620px); min-height: 100svh; margin: 0 auto; padding: 0 16px calc(12px + env(safe-area-inset-bottom)); }
.site-header { position: relative; display: grid; place-items: center; min-height: 118px; padding: 29px 0 3px; }
.game-logo { display: block; width: min(270px, 64vw); height: auto; filter: drop-shadow(0 2px 2px rgb(0 0 0 / 18%)); }
.header-actions { position: absolute; top: 5px; right: 0; display: flex; gap: 6px; z-index: 2; }
.icon-button {
  display: grid;
  place-items: center;
  width: 34px;
  aspect-ratio: 1;
  padding: 0;
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 7px;
  font-weight: 900;
  cursor: pointer;
}
.icon-button:hover { background: var(--surface-2); border-color: var(--line-strong); }
.icon-button svg { width: 17px; height: 17px; fill: none; stroke: currentColor; stroke-width: 1.9; stroke-linecap: round; stroke-linejoin: round; }
.theme-icon { grid-area: 1 / 1; }
.sun-icon { display: none; }
html[data-theme="dark"] .sun-icon { display: block; }
html[data-theme="dark"] .moon-icon { display: none; }

.game { padding-top: 1px; }
.status-strip { width: min(100%, 312px); margin: 0 auto 7px; }
.status-copy { display: flex; justify-content: space-between; color: var(--muted); font-size: .78rem; font-weight: 850; font-variant-numeric: tabular-nums; }

.play-region {
  position: relative;
  display: grid;
  grid-template-columns: max-content calc(var(--rail-width) - var(--rail-overlap));
  align-items: stretch;
  justify-content: center;
  gap: 0;
  height: var(--board-zone-height);
  min-height: var(--board-zone-height);
}
.play-region[data-density="roomy"] { --tile-size: 58px; --tile-gap: 7px; --board-pad: 8px; }
.play-region[data-density="balanced"] { --tile-size: 48px; --tile-gap: 5px; --board-pad: 7px; }
.play-region[data-density="dense"] { --tile-size: 41px; --tile-gap: 4px; --board-pad: 5px; }
.play-region[data-density="compact"] { --tile-size: 36px; --tile-gap: 3px; --board-pad: 1px; }
.board-panel {
  position: relative;
  z-index: 2;
  display: grid;
  align-items: end;
  min-width: calc((var(--tile-size) * 4) + (var(--tile-gap) * 3));
  height: 100%;
}
.guess-history {
  display: grid;
  grid-auto-rows: var(--tile-size);
  align-content: end;
  gap: var(--tile-gap);
  height: 100%;
  padding-block: var(--board-pad);
  transition: gap .24s ease, padding .24s ease;
}
.board-row { display: grid; place-items: center; height: var(--tile-size); transition: height .24s ease; }
.tile-row { display: grid; grid-template-columns: repeat(4, var(--tile-size)); gap: var(--tile-gap); justify-content: center; perspective: 700px; }
.tile {
  display: grid;
  place-items: center;
  width: var(--tile-size);
  height: var(--tile-size);
  color: #fff;
  background: var(--tile-neutral);
  border: 2px solid var(--tile-border);
  border-radius: 2px;
  font-family: Arial, Helvetica, sans-serif;
  font-size: calc(var(--tile-size) * .47);
  font-weight: 800;
  line-height: 1;
  text-transform: uppercase;
  text-shadow: none;
  box-shadow: none;
  backface-visibility: hidden;
  transform-style: preserve-3d;
  transition: width .24s ease, height .24s ease, font-size .24s ease, border-color .18s ease, background .18s ease;
}
.tile.exact { color: #fff; background: var(--green); border-color: var(--green); }
.tile.present { color: #fff; background: var(--yellow); border-color: var(--yellow); }
.tile.absent { color: #fff; background: var(--absent); border-color: var(--absent); }
.active-row .tile { color: var(--ink); background: var(--tile-neutral); border-color: var(--tile-border); }
.active-row .tile.active { border-color: var(--ink); box-shadow: inset 0 0 0 1px var(--ink); }

.signal-rail {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-rows: auto 1fr auto;
  width: var(--rail-width);
  height: var(--board-zone-height);
  min-width: 0;
  margin-left: calc(var(--rail-overlap) * -1);
}
.wire {
  position: relative;
  z-index: 2;
  display: grid;
  align-content: center;
  justify-items: center;
  justify-self: end;
  width: calc(var(--rail-width) - var(--rail-overlap) + 3px);
  min-height: 48px;
  padding: 4px 3px;
  color: var(--cyan);
  background: var(--surface);
  border: 1px solid currentColor;
  border-radius: 7px;
  text-align: center;
  transition: transform .55s ease, background .25s ease, opacity .25s ease;
}
.wire-b { color: var(--orange); }
.signal-name { font-size: .7rem; font-weight: 950; letter-spacing: .04em; }
.wire strong { margin-top: 2px; color: var(--ink); font-family: Arial, Helvetica, sans-serif; font-size: .72rem; letter-spacing: .06em; text-shadow: none; }
.wire-state { margin-top: 2px; color: var(--muted); font-size: .5rem; font-weight: 900; letter-spacing: .03em; }
.wire.solved { background: var(--cyan-soft); animation: card-untangle .65s ease both; }
.wire-b.solved { background: var(--orange-soft); }
.wire.solved .wire-state { color: currentColor; }
.wire.revealed { border-color: var(--line-strong); }
.wire-crossing { position: relative; z-index: 0; min-height: 42px; pointer-events: none; }
.wire-crossing svg { display: block; width: 100%; height: 100%; overflow: visible; opacity: .72; }
.wire-crossing::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: 11px;
  height: 11px;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  background: var(--surface);
  transform: translate(-50%, -50%);
  opacity: .74;
  transition: opacity .3s ease, transform .55s ease;
}
.wire-path { fill: none; stroke-width: 3; stroke-linecap: round; vector-effect: non-scaling-stroke; transform-origin: center; transition: opacity .35s ease, transform .65s ease, stroke-width .35s ease; }
.wire-path-a { stroke: var(--cyan-bright); }
.wire-path-b { stroke: var(--orange-bright); }
.wire-node { fill: var(--surface); stroke-width: 2; vector-effect: non-scaling-stroke; transition: opacity .35s ease, transform .65s ease; }
.wire-node-a { stroke: var(--cyan-bright); }
.wire-node-b { stroke: var(--orange-bright); }
.signal-a-solved .wire-a { transform: translateX(-7px); }
.signal-b-solved .wire-b { transform: translateX(7px); }
.signal-a-solved .wire-path-a, .signal-a-solved .wire-node-a { opacity: .24; transform: translateX(-15px) scaleX(.82); }
.signal-b-solved .wire-path-b, .signal-b-solved .wire-node-b { opacity: .24; transform: translateX(15px) scaleX(.82); }
.signal-a-solved .wire-path-b, .signal-b-solved .wire-path-a { stroke-width: 4; }
.signal-a-solved .wire-crossing::after, .signal-b-solved .wire-crossing::after { opacity: 0; transform: translate(-50%, -50%) scale(.35); }

.feedback-slot { position: relative; height: 20px; margin-top: 2px; }
.message { min-height: 18px; color: var(--danger); text-align: center; font-size: .76rem; font-weight: 800; }
.interaction-zone { display: grid; width: 100%; height: 139px; }
.keyboard, .inline-result { grid-area: 1 / 1; }
.keyboard { display: grid; align-self: start; gap: 5px; width: min(100%, 540px); margin: 0 auto; user-select: none; opacity: 1; transform: translateY(0); visibility: visible; transition: opacity .28s ease, transform .28s ease, visibility 0s linear 0s; }
.key-row { display: flex; justify-content: center; gap: 4px; }
.key {
  flex: 1;
  min-width: 0;
  max-width: 44px;
  height: 43px;
  padding: 0;
  color: var(--key-ink);
  background: var(--key-neutral);
  border: 1px solid var(--key-border);
  border-radius: 4px;
  font-family: Arial, Helvetica, sans-serif;
  font-size: .78rem;
  font-weight: 800;
  line-height: 1;
  text-shadow: none;
  box-shadow: none;
  cursor: pointer;
  touch-action: manipulation;
}
.key.wide { flex: 1.55; max-width: 68px; font-size: .62rem; }
.key:hover:not(:disabled) { filter: brightness(.96); }
.key:active:not(:disabled) { transform: translateY(1px); }
.key.exact { color: #fff; background: var(--green); border-color: var(--green); }
.key.present { color: #fff; background: var(--yellow); border-color: var(--yellow); }
.key.absent { color: #fff; background: var(--key-absent); border-color: var(--key-absent); }
.key:disabled { cursor: default; opacity: .84; }

.inline-result {
  align-self: start;
  width: min(100%, 470px);
  margin: 0 auto;
  padding: 9px 11px 10px;
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 10px;
  text-align: center;
  opacity: 0;
  transform: translateY(12px);
  visibility: hidden;
  pointer-events: none;
  transition: opacity .18s ease, transform .18s ease, visibility 0s linear .18s;
}
.inline-result .eyebrow { margin: 0; }
.inline-result h2 { margin: 2px 0 0; font-size: 1.18rem; letter-spacing: -.015em; }
.inline-result .result-summary { margin: 2px 0 8px; color: var(--muted); font-size: .78rem; }
.inline-result .result-actions { display: grid; grid-template-columns: 1.35fr 1fr 1fr; gap: 6px; }
.inline-result .result-actions button { min-height: 36px; padding: 5px 8px; font-size: .72rem; }
.interaction-zone.show-result .keyboard { opacity: 0; transform: translateY(13px); visibility: hidden; pointer-events: none; transition: opacity .28s ease, transform .28s ease, visibility 0s linear .28s; }
.interaction-zone.show-result .inline-result { opacity: 1; transform: translateY(0); visibility: visible; pointer-events: auto; transition: opacity .25s ease .30s, transform .25s ease .30s, visibility 0s linear 0s; }
.interaction-zone.instant-result .keyboard, .interaction-zone.instant-result .inline-result { transition: none !important; }

.eyebrow { margin: 0 0 3px; color: var(--cyan); font-size: .72rem; font-weight: 900; letter-spacing: .15em; }
.modal { width: min(calc(100% - 28px), 500px); max-height: calc(100svh - 28px); padding: 0; color: var(--ink); background: transparent; border: 0; overflow: visible; }
.modal::backdrop { background: var(--modal-backdrop); backdrop-filter: blur(5px); }
.modal-card { position: relative; max-height: calc(100svh - 28px); padding: 27px; overflow: auto; background: var(--surface); border: 1px solid var(--line); border-radius: 14px; box-shadow: 0 24px 70px rgb(0 0 0 / 28%); }
.close-button { position: absolute; top: 10px; right: 11px; width: 38px; height: 38px; padding: 0; color: var(--muted); background: transparent; border: 0; font-size: 1.6rem; cursor: pointer; }
.modal h2 { margin: 0; font-size: 1.7rem; letter-spacing: -.025em; }
.modal p { color: var(--muted); line-height: 1.52; }
.modal .signal-note { padding: 10px 12px; color: var(--ink); background: var(--cyan-soft); border-left: 3px solid var(--cyan); border-radius: 0 6px 6px 0; font-size: .84rem; }
.example-row { display: grid; grid-template-columns: repeat(4, 48px); gap: 6px; justify-content: center; margin: 21px 0; }
.example-row .tile { width: 48px; height: 48px; font-size: 1.4rem; }
.legend { display: grid; gap: 10px; padding: 0; list-style: none; color: var(--muted); font-size: .9rem; }
.legend li { display: flex; align-items: center; gap: 10px; }
.legend i, .archive-legend i { width: 16px; aspect-ratio: 1; border-radius: 2px; background: var(--absent); }
.legend i.exact { background: var(--green); }.legend i.present { background: var(--yellow); }.legend i.absent { background: var(--absent); }
.primary-button, .secondary-button { width: 100%; min-height: 46px; padding: 11px 17px; border-radius: 7px; font-weight: 900; cursor: pointer; }
.primary-button { color: #07141b; background: #63d8ed; border: 1px solid #45b9cc; }
.secondary-button { color: var(--ink); background: transparent; border: 1px solid var(--line-strong); }

.archive-toolbar { display: grid; grid-template-columns: 42px 1fr 42px; align-items: center; margin: 19px 0 12px; }
.archive-toolbar strong { text-align: center; }
.archive-toolbar button { width: 38px; aspect-ratio: 1; color: var(--ink); background: var(--surface-2); border: 1px solid var(--line-strong); border-radius: 6px; cursor: pointer; font-size: 1.35rem; }
.calendar-weekdays, .calendar { display: grid; grid-template-columns: repeat(7, 1fr); gap: 5px; text-align: center; }
.calendar-weekdays { margin-bottom: 6px; color: var(--dim); font-size: .68rem; font-weight: 900; }
.calendar-day { display: grid; place-items: center; aspect-ratio: 1; color: var(--ink); background: var(--surface-2); border: 1px solid transparent; border-radius: 5px; font-size: .78rem; font-weight: 850; cursor: pointer; }
.calendar-day:hover:not(:disabled) { border-color: var(--cyan); }
.calendar-day.today { border-color: var(--orange); }
.calendar-day.won { color: #fff; background: var(--green); }.calendar-day.lost { color: #fff; background: #a94e55; }
.calendar-day:disabled { opacity: .28; cursor: not-allowed; }.calendar-day.blank { visibility: hidden; }
.archive-legend { display: flex; justify-content: center; flex-wrap: wrap; gap: 15px; margin-top: 15px; color: var(--dim); font-size: .72rem; }
.archive-legend span { display: flex; align-items: center; gap: 5px; }.archive-legend i { width: 10px; border-radius: 2px; }.archive-legend .won { background: var(--green); }.archive-legend .lost { background: #a94e55; }.archive-legend .available { background: var(--surface-2); border: 1px solid var(--line); }

.shake { animation: shake .38s ease; }
.tile.reveal { animation-duration: .56s; animation-timing-function: ease-in-out; animation-fill-mode: both; }
.tile.reveal.exact { animation-name: flip-exact; }
.tile.reveal.present { animation-name: flip-present; }
.tile.reveal.absent { animation-name: flip-absent; }

@keyframes shake { 0%, 100% { transform: translateX(0); } 20%, 60% { transform: translateX(-7px); } 40%, 80% { transform: translateX(7px); } }
@keyframes flip-exact {
  0% { transform: rotateX(0); color: var(--ink); background: var(--tile-neutral); border-color: var(--tile-border); }
  49% { transform: rotateX(90deg); color: var(--ink); background: var(--tile-neutral); border-color: var(--tile-border); }
  50% { transform: rotateX(90deg); color: #fff; background: var(--green); border-color: var(--green); }
  100% { transform: rotateX(0); color: #fff; background: var(--green); border-color: var(--green); }
}
@keyframes flip-present {
  0% { transform: rotateX(0); color: var(--ink); background: var(--tile-neutral); border-color: var(--tile-border); }
  49% { transform: rotateX(90deg); color: var(--ink); background: var(--tile-neutral); border-color: var(--tile-border); }
  50% { transform: rotateX(90deg); color: #fff; background: var(--yellow); border-color: var(--yellow); }
  100% { transform: rotateX(0); color: #fff; background: var(--yellow); border-color: var(--yellow); }
}
@keyframes flip-absent {
  0% { transform: rotateX(0); color: var(--ink); background: var(--tile-neutral); border-color: var(--tile-border); }
  49% { transform: rotateX(90deg); color: var(--ink); background: var(--tile-neutral); border-color: var(--tile-border); }
  50% { transform: rotateX(90deg); color: #fff; background: var(--absent); border-color: var(--absent); }
  100% { transform: rotateX(0); color: #fff; background: var(--absent); border-color: var(--absent); }
}
@keyframes card-untangle { 0% { filter: brightness(.88); } 55% { filter: brightness(1.16); } 100% { filter: brightness(1); } }

@media (max-width: 480px) {
  :root { --rail-width: 62px; --rail-overlap: 17px; --board-zone-height: 350px; }
  .play-region[data-density="roomy"] { --tile-size: 50px; --tile-gap: 5px; --board-pad: 6px; }
  .play-region[data-density="balanced"] { --tile-size: 43px; --tile-gap: 4px; --board-pad: 5px; }
  .play-region[data-density="dense"] { --tile-size: 36px; --tile-gap: 3px; --board-pad: 3px; }
  .play-region[data-density="compact"] { --tile-size: 32px; --tile-gap: 2px; --board-pad: 0px; }
  .page-shell { padding-inline: 8px; }
  .site-header { min-height: 108px; padding-top: 28px; }
  .game-logo { width: min(235px, 74vw); }
  .header-actions { top: 4px; gap: 5px; }.icon-button { width: 32px; border-radius: 6px; }.icon-button svg { width: 16px; height: 16px; }
  .status-strip { margin-bottom: 5px; }.status-copy { font-size: .72rem; }
  .wire { min-height: 43px; padding-inline: 2px; }.signal-name { font-size: .62rem; }.wire strong { font-size: .66rem; }.wire-state { font-size: .46rem; }
  .feedback-slot { height: 18px; }.message { min-height: 16px; font-size: .7rem; }
  .interaction-zone { height: 128px; }.inline-result { padding: 7px 8px 8px; }.inline-result h2 { font-size: 1.08rem; }.inline-result .result-summary { margin-bottom: 6px; font-size: .72rem; }.inline-result .result-actions button { min-height: 34px; padding-inline: 5px; font-size: .66rem; }
  .keyboard { gap: 4px; }.key-row { gap: 3px; }.key { max-width: none; height: 40px; font-size: .72rem; }.key.wide { max-width: none; font-size: .56rem; }
  .modal-card { padding: 24px 19px; }.example-row { grid-template-columns: repeat(4, 43px); gap: 5px; }.example-row .tile { width: 43px; height: 43px; }
}

@media (max-width: 350px) {
  :root { --rail-width: 60px; --rail-overlap: 17px; }
  .play-region[data-density="roomy"] { --tile-size: 48px; --tile-gap: 5px; }
  .play-region[data-density="balanced"] { --tile-size: 41px; --tile-gap: 4px; }
  .play-region[data-density="dense"] { --tile-size: 35px; --tile-gap: 3px; }
  .play-region[data-density="compact"] { --tile-size: 31px; --tile-gap: 2px; }
  .game-logo { width: 215px; }
  .wire { min-height: 41px; }.signal-name { letter-spacing: .03em; }.wire strong { font-size: .63rem; }
}

@media (max-height: 720px) and (max-width: 600px) {
  :root { --rail-width: 60px; --rail-overlap: 16px; --board-zone-height: 292px; }
  .play-region[data-density="roomy"] { --tile-size: 44px; --tile-gap: 5px; --board-pad: 4px; }
  .play-region[data-density="balanced"] { --tile-size: 37px; --tile-gap: 3px; --board-pad: 3px; }
  .play-region[data-density="dense"] { --tile-size: 31px; --tile-gap: 2px; --board-pad: 2px; }
  .play-region[data-density="compact"] { --tile-size: 27px; --tile-gap: 2px; --board-pad: 0px; }
  .site-header { min-height: 82px; padding-top: 23px; }.game-logo { width: 178px; }.header-actions { top: 2px; }.icon-button { width: 28px; }.icon-button svg { width: 14px; height: 14px; }
  .status-strip { margin-bottom: 3px; }.wire { min-height: 39px; padding-block: 2px; }.signal-name { font-size: .58rem; }.wire strong { font-size: .62rem; }.wire-state { font-size: .44rem; }
  .feedback-slot { height: 15px; }.message { min-height: 14px; }.interaction-zone { height: 111px; }.keyboard { gap: 3px; }.key { height: 35px; }
  .inline-result { padding: 4px 6px 5px; }.inline-result .eyebrow { font-size: .58rem; }.inline-result h2 { margin-top: 0; font-size: .96rem; }.inline-result .result-summary { margin: 0 0 4px; font-size: .65rem; }.inline-result .result-actions { gap: 4px; }.inline-result .result-actions button { min-height: 30px; padding: 3px 4px; font-size: .61rem; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; transition-delay: 0s !important; }
}