* {
  box-sizing: border-box;
}

:root {
  --bg: #050511;
  --ink: #ffffff;
  --muted: #b9c0e9;
  --cyan: #25e7ff;
  --pink: #ff43d1;
  --gold: #ffe66d;
  --green: #65ffa8;
  --violet: #8f5bff;
}

html,
body {
  width: 100%;
  min-height: 100%;
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 14% 16%, rgba(37,231,255,.22), transparent 30%),
    radial-gradient(circle at 86% 18%, rgba(255,67,209,.20), transparent 28%),
    linear-gradient(135deg, #04040f 0%, #12001f 48%, #031a2d 100%);
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(rgba(255,255,255,.03) 50%, rgba(0,0,0,.04) 50%) 0 0 / 100% 4px,
    linear-gradient(90deg, rgba(37,231,255,.05) 1px, transparent 1px) 0 0 / 54px 54px,
    linear-gradient(rgba(255,67,209,.05) 1px, transparent 1px) 0 0 / 54px 54px;
  opacity: .72;
}

a,
button {
  -webkit-tap-highlight-color: transparent;
}

a:focus-visible,
button:focus-visible {
  outline: 3px solid var(--gold);
  outline-offset: 4px;
}

.game-shell {
  position: relative;
  z-index: 1;
  width: min(1220px, calc(100vw - 28px));
  min-height: 100vh;
  margin: 0 auto;
  padding: 18px 0;
  display: grid;
  grid-template-rows: auto 1fr;
  gap: 14px;
}

.top-bar,
.board-panel,
.control-panel {
  border: 1px solid rgba(255,255,255,.14);
  border-radius: 8px;
  background: rgba(4, 6, 20, .74);
  box-shadow: 0 18px 48px rgba(0,0,0,.30), inset 0 0 30px rgba(37,231,255,.05);
  backdrop-filter: blur(16px);
}

.top-bar {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 14px;
  padding: 14px;
}

.home-link {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 16px;
  border: 1px solid rgba(37,231,255,.32);
  border-radius: 999px;
  color: #eaffff;
  text-decoration: none;
  font-weight: 950;
  background: rgba(37,231,255,.09);
}

.title-block h1 {
  margin: 0;
  font-size: clamp(26px, 4vw, 46px);
  line-height: .92;
  letter-spacing: -.04em;
  text-transform: uppercase;
  text-shadow: 0 0 22px rgba(37,231,255,.42), 0 0 36px rgba(255,67,209,.22);
}

.title-block p,
.eyebrow {
  margin: 4px 0 0;
  color: var(--gold);
  font-size: 12px;
  font-weight: 950;
  letter-spacing: .20em;
  text-transform: uppercase;
}

.score-panel,
.lab-stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(78px, 1fr));
  gap: 8px;
}

.score-panel div,
.lab-stats div {
  min-height: 54px;
  display: grid;
  align-content: center;
  gap: 3px;
  padding: 8px 12px;
  border: 1px solid rgba(255,255,255,.12);
  border-radius: 8px;
  background: rgba(255,255,255,.06);
}

.score-panel span,
.lab-stats span {
  color: var(--muted);
  font-size: 10px;
  font-weight: 950;
  letter-spacing: .16em;
  text-transform: uppercase;
}

.score-panel b,
.lab-stats b {
  font-size: 22px;
  line-height: 1;
}

.lab-layout {
  min-height: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 330px;
  gap: 14px;
}

.board-panel {
  position: relative;
  overflow: hidden;
  min-height: 660px;
  background:
    radial-gradient(circle at 50% 60%, rgba(37,231,255,.13), transparent 34%),
    linear-gradient(180deg, rgba(8,10,30,.62), rgba(3,4,14,.92));
}

#gameCanvas {
  display: block;
  width: 100%;
  height: 100%;
  min-height: 660px;
  cursor: pointer;
}

.control-panel {
  padding: 18px;
  display: grid;
  align-content: start;
  gap: 16px;
}

.control-panel h2 {
  margin: 8px 0 8px;
  font-size: 32px;
  line-height: .95;
  letter-spacing: -.04em;
  text-transform: uppercase;
  text-shadow: 0 0 22px rgba(37,231,255,.28);
}

.control-panel p {
  margin: 0;
  color: #dce8ff;
  font-weight: 700;
}

.lab-stats {
  grid-template-columns: 1fr 1fr 1fr;
}

.tools {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.tools .small-button:last-child {
  grid-column: 1 / -1;
}

.main-button,
.small-button,
.level-button {
  border: 0;
  border-radius: 999px;
  cursor: pointer;
  font-weight: 950;
  text-transform: uppercase;
}

.main-button {
  min-height: 54px;
  padding: 0 28px;
  color: #06101f;
  font-size: 16px;
  letter-spacing: .08em;
  background: linear-gradient(100deg, var(--cyan), #ffffff, var(--pink));
  box-shadow: 0 0 34px rgba(37,231,255,.30);
}

.small-button,
.level-button {
  min-height: 42px;
  padding: 0 14px;
  color: #eaffff;
  border: 1px solid rgba(255,255,255,.16);
  background: rgba(255,255,255,.10);
}

.level-select {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 8px;
}

.level-button {
  border-radius: 8px;
}

.level-button.active {
  color: #06101f;
  background: linear-gradient(100deg, var(--cyan), #ffffff, var(--pink));
}

.level-button.solved::after {
  content: attr(data-stars);
  display: block;
  margin-top: 2px;
  color: var(--gold);
  font-size: 9px;
  letter-spacing: .12em;
}

.level-button.locked {
  opacity: .35;
  cursor: not-allowed;
}

.instructions {
  padding: 14px;
  border: 1px solid rgba(255,255,255,.12);
  border-radius: 8px;
  background: rgba(255,255,255,.06);
}

.instructions p + p {
  margin-top: 9px;
}

.instructions strong {
  color: var(--gold);
}

.win-panel {
  position: absolute;
  left: 50%;
  top: 50%;
  width: min(520px, calc(100% - 36px));
  transform: translate(-50%, -50%);
  padding: 28px;
  text-align: center;
  border: 1px solid rgba(255,255,255,.18);
  border-radius: 8px;
  background: linear-gradient(145deg, rgba(7,10,32,.94), rgba(25,6,44,.90));
  box-shadow: 0 0 70px rgba(37,231,255,.20), 0 0 110px rgba(255,67,209,.14), inset 0 0 46px rgba(255,255,255,.04);
  backdrop-filter: blur(18px);
}

.win-panel:not(.hidden) {
  animation: winPop .42s cubic-bezier(.2, 1.2, .2, 1) both;
}

.win-panel h2 {
  margin: 8px 0 10px;
  font-size: clamp(34px, 6vw, 66px);
  line-height: .9;
  letter-spacing: -.05em;
  text-transform: uppercase;
}

.win-panel p {
  color: #dce8ff;
  font-weight: 800;
}

.star-result {
  margin: 14px auto 18px;
  color: var(--gold);
  font-size: clamp(28px, 5vw, 46px);
  font-weight: 1000;
  letter-spacing: .16em;
  text-shadow: 0 0 22px rgba(255,230,109,.5);
}

.hidden {
  display: none !important;
}

@media (max-width: 980px) {
  .top-bar,
  .lab-layout {
    grid-template-columns: 1fr;
  }

  .score-panel {
    grid-template-columns: repeat(4, 1fr);
  }

  .board-panel,
  #gameCanvas {
    min-height: 560px;
  }

  .control-panel {
    margin-bottom: 18px;
  }
}

@media (max-width: 620px) {
  .game-shell {
    width: min(100vw - 18px, 1220px);
    padding: 10px 0;
  }

  .score-panel,
  .lab-stats,
  .tools {
    grid-template-columns: 1fr;
  }

  .tools .small-button:last-child {
    grid-column: auto;
  }

  .board-panel,
  #gameCanvas {
    min-height: 500px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
}

@keyframes winPop {
  from {
    opacity: 0;
    transform: translate(-50%, -46%) scale(.9);
  }
  to {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
  }
}