:root {
  --bg: #faf8ef;
  --board: #bbada0;
  --text: #776e65;
  --text-light: #f9f6f2;
  --accent: #edc22e;
  --shadow: 0 12px 40px rgba(119, 110, 101, 0.18);
  --radius: 12px;
  font-family: "Clear Sans", "Outfit", system-ui, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.5;
}

a {
  color: #8f7a66;
  text-decoration: none;
  font-weight: 700;
}

a:hover {
  color: #bbada0;
}

.site-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.5rem;
  max-width: 1100px;
  margin: 0 auto;
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
}

.logo {
  font-size: 1.75rem;
  font-weight: 700;
  background: var(--accent);
  color: #fff;
  padding: 0.15rem 0.55rem;
  border-radius: 8px;
}

.tag {
  font-size: 0.85rem;
  opacity: 0.8;
}

nav {
  display: flex;
  gap: 1.25rem;
  flex-wrap: wrap;
}

main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.5rem 3rem;
}

.hero {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 2.5rem;
  align-items: start;
  margin-top: 1rem;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.75rem;
  font-weight: 700;
  opacity: 0.7;
  margin: 0 0 0.75rem;
}

.hero h1 {
  font-size: clamp(2rem, 4vw, 2.75rem);
  line-height: 1.15;
  margin: 0 0 1rem;
}

.hero h1 em {
  font-style: normal;
  color: #f67c5f;
}

.lead {
  font-size: 1.1rem;
  margin: 0 0 1.25rem;
  max-width: 36ch;
}

.features {
  padding-left: 1.2rem;
  margin: 0 0 1.5rem;
}

.features li {
  margin-bottom: 0.35rem;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.btn {
  display: inline-block;
  padding: 0.7rem 1.2rem;
  border-radius: 8px;
  font-weight: 700;
  border: 2px solid transparent;
}

.btn.primary {
  background: #8f7a66;
  color: #fff;
}

.btn.primary:hover {
  background: #9f8b77;
  color: #fff;
}

.btn.ghost {
  border-color: #bbada0;
  color: var(--text);
}

.game-panel {
  background: #fff;
  border-radius: var(--radius);
  padding: 1.25rem;
  box-shadow: var(--shadow);
}

.score-bar {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1rem;
}

.title-block h2 {
  margin: 0;
  font-size: 2rem;
}

.hint {
  margin: 0.15rem 0 0;
  font-size: 0.85rem;
  opacity: 0.75;
}

.scores {
  display: flex;
  gap: 0.5rem;
}

.score-box {
  background: var(--board);
  color: #fff;
  border-radius: 6px;
  min-width: 70px;
  padding: 0.35rem 0.6rem;
  text-align: center;
}

.score-box .label {
  display: block;
  font-size: 0.7rem;
  text-transform: uppercase;
  opacity: 0.9;
}

.score-box span:last-child {
  font-size: 1.25rem;
  font-weight: 700;
}

.board-wrap {
  position: relative;
}

.board {
  background: var(--board);
  border-radius: 8px;
  padding: 10px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  aspect-ratio: 1;
  width: 100%;
  max-width: 420px;
  margin: 0 auto;
}

.cell {
  background: rgba(238, 228, 218, 0.35);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: clamp(1.25rem, 5vw, 2rem);
  aspect-ratio: 1;
  transition: transform 80ms ease;
}

.cell.v2 { background: #eee4da; color: #776e65; }
.cell.v4 { background: #ede0c8; color: #776e65; }
.cell.v8 { background: #f2b179; color: #f9f6f2; }
.cell.v16 { background: #f59563; color: #f9f6f2; }
.cell.v32 { background: #f67c5f; color: #f9f6f2; }
.cell.v64 { background: #f65e3b; color: #f9f6f2; }
.cell.v128 { background: #edcf72; color: #f9f6f2; font-size: clamp(1.1rem, 4.5vw, 1.75rem); }
.cell.v256 { background: #edcc61; color: #f9f6f2; font-size: clamp(1.1rem, 4.5vw, 1.75rem); }
.cell.v512 { background: #edc850; color: #f9f6f2; font-size: clamp(1.1rem, 4.5vw, 1.75rem); }
.cell.v1024 { background: #edc53f; color: #f9f6f2; font-size: clamp(0.95rem, 4vw, 1.4rem); }
.cell.v2048 { background: #edc22e; color: #f9f6f2; font-size: clamp(0.95rem, 4vw, 1.4rem); }
.cell.vhuge { background: #3c3a32; color: #f9f6f2; font-size: clamp(0.85rem, 3.5vw, 1.2rem); }

.overlay {
  position: absolute;
  inset: 0;
  background: rgba(238, 228, 218, 0.78);
  border-radius: 8px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 1rem;
}

.overlay.hidden {
  display: none;
}

.overlay p {
  margin: 0.25rem 0;
}

#overlay-title {
  font-size: 2rem;
  font-weight: 700;
}

.mobile-pad {
  display: none;
  margin-top: 1rem;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
}

.mobile-pad .mid {
  display: flex;
  gap: 0.4rem;
}

.mobile-pad button {
  width: 56px;
  height: 48px;
  border: none;
  border-radius: 8px;
  background: var(--board);
  color: #fff;
  font-size: 1.25rem;
  font-weight: 700;
  cursor: pointer;
}

.about {
  margin-top: 3.5rem;
}

.about h2 {
  margin-bottom: 0.75rem;
}

.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-top: 1.5rem;
}

.cards article {
  background: #fff;
  border-radius: var(--radius);
  padding: 1.25rem;
  box-shadow: var(--shadow);
}

.cards h3 {
  margin: 0 0 0.5rem;
}

.cards p {
  margin: 0;
  font-size: 0.95rem;
}

code {
  background: rgba(187, 173, 160, 0.25);
  padding: 0.1rem 0.35rem;
  border-radius: 4px;
  font-size: 0.9em;
}

footer {
  text-align: center;
  padding: 2rem 1rem 3rem;
  opacity: 0.85;
  font-size: 0.95rem;
}

@media (max-width: 860px) {
  .hero {
    grid-template-columns: 1fr;
  }

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

  .mobile-pad {
    display: flex;
  }
}