:root {
  color-scheme: light;
  --paper: #f4f2eb;
  --ink: #121212;
  --muted: #74726b;
  --signal: #ff4f24;
  --grid-line: rgba(18, 18, 18, 0.16);
  --found-line: rgba(255, 79, 36, 0.7);
  --preview-line: rgba(18, 18, 18, 0.18);
  font-family: "Courier New", Courier, monospace;
  font-synthesis: none;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--paper);
}

body {
  min-width: 320px;
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(rgba(18, 18, 18, 0.025) 1px, transparent 1px),
    var(--paper);
  background-size: 100% 8px;
}

button {
  font: inherit;
}

.page-shell {
  width: min(1500px, 100%);
  min-height: 100vh;
  margin: 0 auto;
  padding: clamp(22px, 4vw, 64px);
}

.masthead {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 32px;
  padding-bottom: 24px;
  border-bottom: 2px solid var(--ink);
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.14em;
}

h1 {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  font-size: clamp(4.2rem, 10vw, 9.5rem);
  font-weight: 900;
  letter-spacing: -0.085em;
  line-height: 0.72;
}

h1 span {
  color: var(--signal);
}

.progress-block {
  display: grid;
  grid-template-columns: auto minmax(120px, 18vw) auto;
  align-items: center;
  gap: 13px;
  padding-bottom: 4px;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.06em;
}

.progress-track {
  height: 4px;
  overflow: hidden;
  background: rgba(18, 18, 18, 0.14);
}

.progress-bar {
  width: 0;
  height: 100%;
  background: var(--signal);
  transition: width 320ms ease;
}

.intro {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(260px, 0.65fr);
  gap: 32px;
  align-items: end;
  padding: clamp(30px, 5vw, 72px) 0 clamp(26px, 4vw, 52px);
}

.intro h2 {
  max-width: 760px;
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  font-size: clamp(2.35rem, 5.5vw, 5.8rem);
  line-height: 0.94;
  letter-spacing: -0.055em;
}

.intro p {
  max-width: 500px;
  margin: 0;
  color: var(--muted);
  font-family: Arial, Helvetica, sans-serif;
  font-size: clamp(0.95rem, 1.25vw, 1.15rem);
  line-height: 1.55;
}

.game-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(250px, 0.28fr);
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
}

.board-panel {
  min-width: 0;
  padding: clamp(18px, 3vw, 42px) clamp(14px, 3vw, 42px) clamp(18px, 3vw, 42px) 0;
  border-right: 1px solid var(--ink);
}

.letter-grid {
  position: relative;
  display: grid;
  grid-template-columns: repeat(20, 1fr);
  width: 100%;
  aspect-ratio: 20 / 15;
  touch-action: none;
  user-select: none;
}

.cell {
  position: relative;
  z-index: 2;
  display: grid;
  place-items: center;
  min-width: 0;
  padding: 0;
  border: 0;
  outline: 0;
  color: var(--ink);
  background: transparent;
  font-size: clamp(0.7rem, 1.55vw, 1.38rem);
  line-height: 1;
  cursor: crosshair;
}

.cell:focus-visible::after,
.cell.hint::after {
  position: absolute;
  width: 72%;
  aspect-ratio: 1;
  border: 1px solid var(--signal);
  border-radius: 50%;
  content: "";
  animation: pulse 900ms ease-in-out infinite alternate;
}

.cell.active {
  color: var(--signal);
}

.line-layer {
  position: absolute;
  z-index: 1;
  inset: 0;
  width: 100%;
  height: 100%;
  overflow: visible;
  pointer-events: none;
}

.selection-line {
  stroke: var(--found-line);
  stroke-linecap: round;
  stroke-width: clamp(12px, 1.7vw, 24px);
  vector-effect: non-scaling-stroke;
}

.preview-line {
  stroke: var(--preview-line);
  stroke-linecap: round;
  stroke-width: clamp(10px, 1.45vw, 20px);
  stroke-dasharray: 3 5;
  vector-effect: non-scaling-stroke;
}

.word-panel {
  display: flex;
  flex-direction: column;
  padding: clamp(24px, 3vw, 42px) 0 clamp(24px, 3vw, 42px) clamp(24px, 3vw, 42px);
}

.word-panel-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--grid-line);
}

.word-panel h2 {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  font-size: 1.35rem;
  letter-spacing: -0.03em;
}

#found-label {
  color: var(--muted);
  font-size: 0.72rem;
  text-transform: uppercase;
}

.word-list {
  display: grid;
  flex: 1;
  grid-template-columns: 1fr;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}

.word-list li {
  display: flex;
  align-items: center;
  min-height: 2.25rem;
  padding: 8px 0;
  border-bottom: 1px solid var(--grid-line);
  font-size: clamp(0.68rem, 0.9vw, 0.86rem);
  letter-spacing: 0.02em;
  transition: color 180ms ease;
}

.word-list li::before {
  width: 1.7rem;
  color: var(--muted);
  font-size: 0.64rem;
  content: counter(list-item, decimal-leading-zero);
}

.word-list li.found {
  color: var(--muted);
  text-decoration: line-through;
  text-decoration-color: var(--signal);
  text-decoration-thickness: 2px;
}

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
  padding-top: 26px;
}

.text-button {
  padding: 3px 0;
  border: 0;
  border-bottom: 1px solid var(--ink);
  color: var(--ink);
  background: transparent;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  cursor: pointer;
}

.text-button:hover,
.text-button:focus-visible {
  color: var(--signal);
  border-color: var(--signal);
}

footer {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  padding: 22px 0 0;
  color: var(--muted);
  font-size: 0.66rem;
  letter-spacing: 0.08em;
}

dialog {
  width: min(520px, calc(100% - 36px));
  padding: clamp(34px, 6vw, 70px);
  border: 2px solid var(--ink);
  color: var(--ink);
  background: var(--paper);
  box-shadow: 18px 18px 0 var(--signal);
}

dialog::backdrop {
  background: rgba(18, 18, 18, 0.72);
}

dialog h2 {
  margin: 0 0 16px;
  font-family: Arial, Helvetica, sans-serif;
  font-size: clamp(3rem, 9vw, 5.5rem);
  letter-spacing: -0.07em;
}

dialog p:not(.eyebrow) {
  margin: 0 0 28px;
  font-family: Arial, Helvetica, sans-serif;
  line-height: 1.5;
}

.dialog-close {
  position: absolute;
  top: 12px;
  right: 15px;
  padding: 6px;
  border: 0;
  background: transparent;
  font-size: 1.5rem;
  cursor: pointer;
}

.primary-button {
  padding: 14px 22px;
  border: 1px solid var(--ink);
  color: var(--paper);
  background: var(--ink);
  font-size: 0.74rem;
  font-weight: 700;
  text-transform: uppercase;
  cursor: pointer;
}

.primary-button:hover,
.primary-button:focus-visible {
  border-color: var(--signal);
  background: var(--signal);
}

.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;
}

@keyframes pulse {
  from { transform: scale(0.82); opacity: 0.55; }
  to { transform: scale(1.08); opacity: 1; }
}

@media (max-width: 900px) {
  .game-layout {
    grid-template-columns: 1fr;
  }

  .board-panel {
    padding-right: 0;
    border-right: 0;
    border-bottom: 1px solid var(--ink);
  }

  .word-panel {
    padding-left: 0;
  }

  .word-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    column-gap: 24px;
  }
}

@media (max-width: 640px) {
  .page-shell {
    padding-inline: 16px;
  }

  .masthead {
    align-items: start;
  }

  .progress-block {
    grid-template-columns: auto auto;
  }

  .progress-track {
    grid-column: 1 / -1;
    grid-row: 2;
  }

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

  .letter-grid {
    width: calc(100% + 8px);
    margin-left: -4px;
  }

  .cell {
    font-size: clamp(0.49rem, 3.1vw, 0.82rem);
  }

  .word-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 18px;
  }

  footer {
    flex-direction: column;
    gap: 6px;
  }
}

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