:root {
  --bg: #10131b;
  --panel: #191e29;
  --panel-light: #222938;
  --text: #f4f6fb;
  --muted: #aeb6c7;
  --accent: #76e06f;
  --danger: #ff5c67;
  --line: #5b2027;
  --game-top: #20283a;
  --game-bottom: #11151f;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

button,
a {
  font: inherit;
}

.game-shell {
  width: min(1100px, 94vw);
  margin: 0 auto;
  padding: 24px 0 32px;
}

.game-header {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 70px;
}

.game-header h1 {
  margin: 0;
  font-size: clamp(1.7rem, 4vw, 2.4rem);
}

.back-link {
  position: absolute;
  left: 0;
  color: var(--muted);
  text-decoration: none;
  font-size: 0.95rem;
}

.back-link:hover {
  color: var(--text);
}

.score-box {
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  min-width: 92px;
  padding: 7px 14px;
  border-radius: 12px;
  background: var(--panel);
}

.score-box span {
  color: var(--muted);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.score-box strong {
  color: var(--accent);
  font-size: 1.6rem;
  line-height: 1.1;
}

.best-box {
  right: 108px;
}

.instructions {
  text-align: center;
  margin: 8px 0 14px;
  color: var(--muted);
}

.instructions p {
  margin: 5px 0;
}

.instructions .hint {
  font-size: 0.9rem;
}

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

.game {
  position: relative;
  width: 100%;
  height: min(70vh, 680px);
  min-height: 470px;
  overflow: hidden;
  border: 2px solid #30384a;
  border-radius: 18px;
  background: linear-gradient(to bottom, var(--game-top), var(--game-bottom));
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.28);
  outline: none;
}

.sky {
  position: absolute;
  inset: 0;
  opacity: 0.35;
  background:
    radial-gradient(circle at 15% 20%, #fff 0 1px, transparent 2px),
    radial-gradient(circle at 72% 15%, #fff 0 1px, transparent 2px),
    radial-gradient(circle at 43% 32%, #fff 0 1px, transparent 2px),
    radial-gradient(circle at 88% 40%, #fff 0 1px, transparent 2px),
    radial-gradient(circle at 26% 55%, #fff 0 1px, transparent 2px);
  background-size: 170px 140px, 230px 180px, 190px 160px, 260px 210px, 210px 190px;
}

.zombies,
.arrows {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.zombie {
  position: absolute;
  width: 9%;
  min-width: 45px;
  max-width: 75px;
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  transform: translate(-50%, -50%);
  user-select: none;
  will-change: transform;
}

.zombie-visual {
  width: 100%;
  height: 100%;
  display: grid;
  place-items: center;
  font-size: clamp(2rem, 5vw, 3.5rem);
  filter: drop-shadow(0 4px 3px rgba(0,0,0,.45));
}

.zombie-key {
  position: absolute;
  bottom: -8px;
  left: 50%;
  transform: translateX(-50%);
  min-width: 28px;
  padding: 2px 7px;
  border-radius: 7px;
  background: rgba(10, 13, 19, 0.88);
  border: 1px solid rgba(255,255,255,.15);
  color: white;
  font-size: 0.85rem;
  font-weight: 800;
  text-align: center;
}

.arrow {
  position: absolute;
  width: 7%;
  min-width: 34px;
  max-width: 55px;
  height: 70px;
  transform: translate(-50%, -50%);
  will-change: transform;
}

.arrow-visual {
  width: 100%;
  height: 100%;
  display: grid;
  place-items: center;
  font-size: clamp(2rem, 4vw, 3rem);
  transform: rotate(-90deg);
  filter: drop-shadow(0 3px 3px rgba(0,0,0,.5));
}

.danger-line {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 72px;
  height: 3px;
  background: var(--danger);
  box-shadow: 0 0 14px rgba(255, 92, 103, .5);
  z-index: 3;
}

.columns {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 72px;
  display: grid;
  grid-template-columns: repeat(10, 1fr);
  align-items: center;
  border-top: 1px solid rgba(255,255,255,.08);
  background: rgba(10, 13, 19, .45);
  z-index: 4;
}

.columns div {
  text-align: center;
  color: rgba(255,255,255,.22);
  font-size: clamp(0.9rem, 2vw, 1.25rem);
  font-weight: 800;
}

.overlay {
  position: absolute;
  inset: 0;
  z-index: 10;
  display: grid;
  place-items: center;
  padding: 20px;
  background: rgba(7, 9, 14, .72);
  backdrop-filter: blur(4px);
}

.overlay.hidden {
  display: none;
}

.overlay-card {
  width: min(390px, 90%);
  padding: 30px;
  border: 1px solid rgba(255,255,255,.1);
  border-radius: 20px;
  background: var(--panel);
  text-align: center;
  box-shadow: 0 20px 60px rgba(0,0,0,.4);
}

.overlay-card h2 {
  margin: 8px 0 10px;
  font-size: 2rem;
}

.overlay-card p {
  color: var(--muted);
  line-height: 1.5;
}

.big-emoji {
  font-size: 4.5rem;
}

.final-score {
  color: var(--accent);
  font-size: 4rem;
  font-weight: 900;
  line-height: 1;
  margin: 10px 0;
}

.primary-button {
  border: 0;
  border-radius: 12px;
  padding: 13px 25px;
  background: var(--accent);
  color: #102010;
  font-weight: 900;
  cursor: pointer;
  transition: transform .12s ease, filter .12s ease;
}

.primary-button:hover {
  filter: brightness(1.08);
  transform: translateY(-1px);
}

.primary-button:active {
  transform: translateY(1px);
}

.keyboard {
  display: grid;
  grid-template-columns: repeat(10, 1fr);
  gap: 7px;
  margin: 14px auto 0;
  width: min(700px, 100%);
}

.keyboard button {
  min-height: 45px;
  border: 1px solid #394255;
  border-radius: 9px;
  background: var(--panel-light);
  color: var(--text);
  font-weight: 800;
  cursor: pointer;
  transition: transform .08s ease, background .08s ease;
}

.keyboard button.active,
.keyboard button:active {
  transform: translateY(2px);
  background: #35415a;
}

.footer-note {
  text-align: center;
  color: #6f788a;
  font-size: 0.78rem;
  margin: 10px 0 0;
}

@media (max-width: 700px) {
  .game-shell {
    width: 96vw;
    padding-top: 12px;
  }

  .game-header {
    padding-top: 35px;
  }

  .back-link {
    top: 0;
  }

  .score-box {
    right: 0;
    top: 35px;
    transform: none;
  }

  .best-box {
    right: 108px;
  }

  .game {
    min-height: 420px;
    height: 67vh;
  }

  .keyboard {
    gap: 3px;
  }

  .keyboard button {
    min-height: 40px;
    padding: 0;
  }
}