:root {
  --bg-top: #fff3dd;
  --bg-bottom: #f0f8ff;
  --panel: rgba(255, 255, 255, 0.84);
  --text-main: #575465;
  --text-soft: #7e7b8f;
  --pink: #ff7aa7;
  --pink-deep: #f05186;
  --blue: #8ec8ff;
  --mint: #9adcb3;
  --gold: #ffd66f;
  --shadow: 0 26px 50px rgba(140, 164, 197, 0.2);
  --board-gap: 12px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Trebuchet MS", "Segoe UI", sans-serif;
  color: var(--text-main);
  background:
    linear-gradient(140deg, rgba(255, 214, 111, 0.16), transparent 34%),
    linear-gradient(220deg, rgba(142, 200, 255, 0.18), transparent 28%),
    linear-gradient(180deg, var(--bg-top), var(--bg-bottom));
}

.app-shell {
  width: min(1140px, calc(100% - 28px));
  margin: 0 auto;
  padding: 28px 0 40px;
}

.page-nav {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

.page-nav a,
.page-footer a {
  text-decoration: none;
  color: var(--text-main);
  font-weight: 700;
}

.page-nav a {
  padding: 12px 16px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.72);
  border: 2px solid rgba(225, 213, 194, 0.9);
  box-shadow: 0 10px 18px rgba(140, 164, 197, 0.12);
}

.hero-band,
.game-panel {
  background: var(--panel);
  backdrop-filter: blur(14px);
  border: 2px solid rgba(255, 255, 255, 0.72);
  border-radius: 28px;
  box-shadow: var(--shadow);
}

.hero-band {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  align-items: flex-start;
  padding: 28px;
  margin-bottom: 18px;
}

.eyebrow,
.mini-label,
.info-label {
  margin: 0 0 8px;
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-soft);
}

h1,
h2,
h3,
p {
  margin: 0;
}

h1 {
  font-size: clamp(2.2rem, 4vw, 3.4rem);
  line-height: 0.98;
}

.subtitle {
  margin-top: 12px;
  max-width: 560px;
  color: var(--text-soft);
  line-height: 1.6;
}

.hero-actions {
  display: grid;
  gap: 14px;
  justify-items: end;
}

.language-switch {
  display: inline-flex;
  padding: 6px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.8);
  border: 2px solid rgba(225, 213, 194, 0.86);
}

.lang-button {
  min-width: 76px;
  min-height: 42px;
  border: 0;
  border-radius: 999px;
  font: inherit;
  font-weight: 800;
  color: var(--text-main);
  background: transparent;
  cursor: pointer;
  transition: transform 0.16s ease, background 0.16s ease, color 0.16s ease;
}

.lang-button.active {
  color: white;
  background: linear-gradient(180deg, var(--pink), var(--pink-deep));
}

.hero-icons {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.hero-icons span {
  display: inline-grid;
  place-items: center;
  min-width: 72px;
  height: 72px;
  padding: 0 12px;
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.78);
  box-shadow: inset 0 0 0 2px rgba(255, 255, 255, 0.75);
  font-size: 1.45rem;
  font-weight: 900;
}

.game-panel {
  padding: 22px;
}

.top-bar,
.stats-grid,
.action-row,
.touch-controls {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.top-bar {
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 18px;
}

.stat-tile {
  min-width: 118px;
  padding: 13px 16px;
  border-radius: 18px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.96), rgba(250, 252, 255, 0.95));
  border: 2px solid rgba(225, 213, 194, 0.82);
}

.label {
  display: block;
  margin-bottom: 4px;
  font-size: 0.8rem;
  color: var(--text-soft);
}

.stat-tile strong {
  font-size: 1.3rem;
}

button {
  border: 0;
  cursor: pointer;
  font: inherit;
  transition: transform 0.16s ease, opacity 0.16s ease;
}

button:hover {
  transform: translateY(-2px);
}

button:active {
  transform: scale(0.97);
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.45;
  transform: none;
}

.primary-button,
.secondary-button,
.control-button {
  min-height: 48px;
  padding: 12px 16px;
  border-radius: 16px;
  font-weight: 800;
}

.primary-button {
  color: white;
  background: linear-gradient(180deg, var(--pink), var(--pink-deep));
  box-shadow: 0 14px 22px rgba(240, 81, 134, 0.24);
}

.secondary-button,
.control-button {
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.86);
  border: 2px solid rgba(225, 213, 194, 0.84);
}

.play-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 18px;
  align-items: start;
}

.board-area,
.side-panel,
.info-card {
  border-radius: 26px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.8), rgba(251, 250, 245, 0.84));
  border: 2px solid rgba(225, 213, 194, 0.82);
}

.board-area {
  padding: 18px;
}

.board-shell {
  position: relative;
}

.board {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--board-gap);
  width: min(100%, 560px);
  aspect-ratio: 1;
  padding: var(--board-gap);
  border-radius: 24px;
  background: linear-gradient(180deg, #d7c7b6, #c9b29f);
  box-shadow: inset 0 0 0 4px rgba(255, 255, 255, 0.24);
}

.cell {
  aspect-ratio: 1;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.22);
}

.tile {
  display: grid;
  place-items: center;
  aspect-ratio: 1;
  border-radius: 18px;
  font-weight: 900;
  font-size: clamp(1.15rem, 4vw, 2.2rem);
  color: #5a5360;
  box-shadow: 0 12px 20px rgba(124, 102, 80, 0.12);
}

.tile[data-value="2"] { background: #fff4df; }
.tile[data-value="4"] { background: #ffeac7; }
.tile[data-value="8"] { background: #ffd7a6; }
.tile[data-value="16"] { background: #ffc2a1; }
.tile[data-value="32"] { background: #ffb0ba; }
.tile[data-value="64"] { background: #ffa1d0; }
.tile[data-value="128"] { background: #ffed93; }
.tile[data-value="256"] { background: #d6f2a4; }
.tile[data-value="512"] { background: #bde9c2; }
.tile[data-value="1024"] { background: #a8d8ff; }
.tile[data-value="2048"] { background: #8ec8ff; color: #28405a; }
.tile[data-value="4096"],
.tile[data-value="8192"] {
  background: #88b7ff;
  color: #203653;
}

.tile.big-value {
  font-size: clamp(1rem, 3.2vw, 1.6rem);
}

.overlay {
  position: absolute;
  inset: 18px;
  display: grid;
  place-items: center;
  padding: 24px 20px;
  border-radius: 24px;
  text-align: center;
  background: rgba(255, 255, 255, 0.9);
  border: 2px solid rgba(255, 255, 255, 0.9);
  box-shadow: 0 18px 30px rgba(124, 102, 80, 0.18);
}

.overlay.hidden {
  display: none;
}

.overlay-tag {
  margin-bottom: 8px;
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-soft);
}

.overlay h2 {
  margin-bottom: 10px;
  font-size: 1.6rem;
}

.overlay p {
  margin-bottom: 16px;
  color: var(--text-soft);
  line-height: 1.55;
}

.side-panel {
  padding: 18px;
}

.info-box + .info-box {
  margin-top: 14px;
}

.info-box {
  padding: 16px;
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.74);
  border: 2px solid rgba(237, 228, 214, 0.9);
}

.info-box h2 {
  margin-bottom: 10px;
}

.info-box p,
.info-box li,
.info-card p {
  color: var(--text-soft);
  line-height: 1.6;
}

.info-box ul {
  margin: 0;
  padding-left: 20px;
}

.info-box li + li {
  margin-top: 8px;
}

.touch-controls {
  margin-top: 18px;
  display: grid;
  grid-template-columns: repeat(3, minmax(70px, 1fr));
  grid-template-areas:
    ". up ."
    "left down right";
  justify-content: center;
}

.control-button {
  min-height: 68px;
  font-size: 1.4rem;
}

.control-button.up { grid-area: up; }
.control-button.left { grid-area: left; }
.control-button.down { grid-area: down; }
.control-button.right { grid-area: right; }

.info-panel {
  display: grid;
  gap: 16px;
  margin-top: 18px;
}

.info-card {
  padding: 20px;
  box-shadow: var(--shadow);
}

.info-card h2 {
  margin-bottom: 12px;
}

.page-footer {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 18px;
  padding: 2px 4px 0;
  color: var(--text-soft);
}

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

@media (max-width: 720px) {
  .app-shell {
    width: min(100% - 18px, 100%);
    padding: 18px 0 28px;
  }

  .hero-band,
  .game-panel {
    border-radius: 24px;
  }

  .hero-band {
    padding: 22px 20px;
    flex-direction: column;
  }

  .hero-actions {
    justify-items: start;
  }

  .hero-icons {
    justify-content: flex-start;
  }

  .board-area,
  .side-panel,
  .game-panel {
    padding: 16px;
  }

  .overlay {
    inset: 12px;
  }
}