:root {
  --bg-a: #0a1028;
  --bg-b: #1b1f50;
  --bg-orb-1: rgba(120, 255, 235, 0.25);
  --bg-orb-2: rgba(255, 140, 198, 0.22);
  --panel: rgba(10, 18, 44, 0.78);
  --panel-border: rgba(120, 255, 235, 0.34);
  --accent: #78ffeb;
  --accent-soft: #ff8ec8;
  --accent-gold: #ffd981;
  --board-shell: rgba(19, 30, 68, 0.92);
  --board-edge: rgba(120, 255, 235, 0.2);
  --board-cell: rgba(255, 255, 255, 0.08);
  --board-blocked: rgba(255, 142, 200, 0.2);
  --text-main: #eef5ff;
  --text-soft: #b8c9ec;
  --button-text: #082639;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  padding: 18px 0 24px;
  background:
    radial-gradient(circle at 12% 18%, var(--bg-orb-1), transparent 38%),
    radial-gradient(circle at 82% 74%, var(--bg-orb-2), transparent 34%),
    linear-gradient(140deg, var(--bg-a), var(--bg-b));
  color: var(--text-main);
  font-family: "Candara", "Trebuchet MS", sans-serif;
  overflow-x: hidden;
}

.bg-grid {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.06) 1px, transparent 1px);
  background-size: 28px 28px;
  mask-image: radial-gradient(circle at center, black 32%, transparent 88%);
}

.bg-orb {
  position: fixed;
  width: 38vw;
  height: 38vw;
  border-radius: 999px;
  filter: blur(48px);
  pointer-events: none;
}

.bg-orb-one {
  left: -10vw;
  top: 4vh;
  background: var(--bg-orb-1);
}

.bg-orb-two {
  right: -8vw;
  bottom: 8vh;
  background: var(--bg-orb-2);
}

.game-shell {
  position: relative;
  z-index: 1;
  width: min(96vw, 1180px);
  padding: 20px;
  border-radius: 28px;
  background: var(--panel);
  border: 1px solid var(--panel-border);
  box-shadow: 0 0 36px rgba(10, 18, 44, 0.35), inset 0 0 44px rgba(0, 0, 0, 0.2);
  backdrop-filter: blur(10px);
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 18px;
  flex-wrap: wrap;
  margin-bottom: 18px;
}

.title-wrap {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

h1 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 3.2rem);
  line-height: 1;
  letter-spacing: 1px;
  text-transform: uppercase;
}

h1 span {
  color: var(--accent);
  text-shadow: 0 0 16px color-mix(in srgb, var(--accent) 68%, transparent);
}

.subtitle {
  margin: 0;
  color: var(--text-soft);
  letter-spacing: 0.3px;
}

.quick-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.quick-links a,
.mini-link {
  border: 1px solid color-mix(in srgb, var(--accent) 44%, transparent);
  border-radius: 999px;
  padding: 6px 10px;
  background: rgba(2, 8, 26, 0.64);
  color: var(--text-main);
  text-decoration: none;
  font-size: 12px;
  font-weight: 700;
}

.hud {
  display: grid;
  grid-template-columns: repeat(4, minmax(120px, 1fr));
  gap: 10px;
  flex: 1;
}

.hud-item,
.score-card,
.mission-card,
.mascot-card,
.save-card,
.controls-card {
  background: rgba(4, 10, 30, 0.7);
  border: 1px solid color-mix(in srgb, var(--accent) 28%, transparent);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.04);
}

.hud-item {
  border-radius: 14px;
  padding: 10px 12px;
}

.hud-item label,
.score-card label {
  display: block;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.9px;
  color: var(--text-soft);
}

.hud-item strong,
.score-card strong {
  font-size: 1.2rem;
}

.arena-wrap {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 16px;
  align-items: start;
}

.board-panel {
  background: rgba(7, 14, 34, 0.55);
  border-radius: 22px;
  padding: 16px;
  border: 1px solid color-mix(in srgb, var(--accent-soft) 24%, transparent);
}

.board-stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
}

.score-card {
  border-radius: 14px;
  padding: 12px;
}

.board-actions {
  display: flex;
  justify-content: end;
  margin: 12px 0 14px;
}

.board-shell {
  position: relative;
  aspect-ratio: 1 / 1;
  width: 100%;
  max-width: 640px;
  margin: 0 auto;
  padding: 14px;
  border-radius: 28px;
  background: linear-gradient(145deg, color-mix(in srgb, var(--board-shell) 90%, black), var(--board-shell));
  border: 1px solid var(--board-edge);
  box-shadow:
    0 16px 34px rgba(0, 0, 0, 0.28),
    inset 0 0 26px rgba(255, 255, 255, 0.03);
  overflow: hidden;
}

.board-grid,
.tile-layer {
  position: absolute;
  inset: 14px;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  grid-template-rows: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.cell {
  border-radius: 18px;
  background: var(--board-cell);
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.cell.blocked {
  display: grid;
  place-items: center;
  background:
    repeating-linear-gradient(135deg, rgba(255, 255, 255, 0.06) 0 10px, transparent 10px 20px),
    var(--board-blocked);
  color: color-mix(in srgb, var(--accent-soft) 86%, white);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 1.2px;
  text-transform: uppercase;
}

.tile {
  border-radius: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  padding: 10px;
  font-weight: 800;
  letter-spacing: 0.6px;
  background: var(--tile-bg);
  box-shadow: var(--tile-shadow);
  color: var(--tile-ink);
  text-shadow: 0 1px 0 rgba(255, 255, 255, 0.16);
  border: 1px solid rgba(255, 255, 255, 0.18);
  transition: transform 135ms cubic-bezier(0.22, 0.84, 0.28, 1), opacity 135ms ease;
  will-change: transform, opacity;
  z-index: 1;
}

.tile.is-ghost {
  opacity: 0.78;
  pointer-events: none;
  z-index: 3;
}

.tile.spawn-pop {
  animation: tile-spawn-pop 180ms cubic-bezier(0.22, 0.84, 0.28, 1);
  z-index: 4;
}

.tile.merge-pop {
  animation: tile-merge-pop 190ms cubic-bezier(0.22, 0.84, 0.28, 1);
  z-index: 4;
}

@keyframes tile-spawn-pop {
  0% {
    transform: scale(0.72);
    opacity: 0.2;
  }

  68% {
    transform: scale(1.08);
    opacity: 1;
  }

  100% {
    transform: scale(1);
    opacity: 1;
  }
}

@keyframes tile-merge-pop {
  0% {
    transform: scale(1);
  }

  50% {
    transform: scale(1.11);
  }

  100% {
    transform: scale(1);
  }
}
.tile::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.18), transparent 48%);
  pointer-events: none;
}

.tile-value {
  position: relative;
  z-index: 1;
  font-size: clamp(1.15rem, 4vw, 2rem);
}

.tile.digits-3 .tile-value {
  font-size: clamp(1rem, 3.4vw, 1.6rem);
}

.tile.digits-4 .tile-value {
  font-size: clamp(0.92rem, 3vw, 1.35rem);
}

.tile.digits-5 .tile-value {
  font-size: clamp(0.76rem, 2.5vw, 1.05rem);
}

.touch-controls {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  grid-template-areas:
    ". up ."
    "left . right"
    ". down .";
  gap: 10px;
  margin: 16px auto 0;
  max-width: 360px;
}

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

.touch-btn,
button,
.ghost-btn {
  border: none;
  border-radius: 14px;
  min-height: 44px;
  padding: 11px 16px;
  font-weight: 800;
  cursor: pointer;
  text-transform: uppercase;
  letter-spacing: 0.8px;
}

button,
.touch-btn {
  background: linear-gradient(135deg, var(--accent), color-mix(in srgb, var(--accent-soft) 40%, var(--accent)));
  color: var(--button-text);
  box-shadow: 0 10px 24px color-mix(in srgb, var(--accent) 34%, transparent);
}

.ghost-btn,
button.secondary,
.mini-btn {
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-main);
  border: 1px solid color-mix(in srgb, var(--accent-soft) 36%, transparent);
  box-shadow: none;
}

.legend {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.legend h2 {
  margin: 0;
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--accent-gold);
}

.legend p {
  margin: 0;
  line-height: 1.45;
  color: var(--text-soft);
}

.mission-card,
.mascot-card,
.save-card,
.controls-card {
  border-radius: 18px;
  padding: 14px;
}

.modifier-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 10px;
}

.modifier-tag {
  position: relative;
  border-radius: 999px;
  padding: 6px 10px;
  background: color-mix(in srgb, var(--accent) 14%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 26%, transparent);
  color: var(--text-main);
  font-size: 12px;
  font-weight: 700;
  cursor: help;
  outline: none;
}

.modifier-tag.is-new {
  border-color: color-mix(in srgb, var(--accent-gold) 58%, transparent);
  box-shadow: 0 0 18px color-mix(in srgb, var(--accent-gold) 18%, transparent);
}

.modifier-tag::before,
.modifier-tag::after {
  position: absolute;
  opacity: 0;
  pointer-events: none;
  transition: opacity 140ms ease, transform 140ms ease;
  z-index: 8;
}

.modifier-tag::before {
  content: "";
  left: 50%;
  bottom: calc(100% + 7px);
  transform: translate(-50%, 4px);
  border-width: 7px 7px 0 7px;
  border-style: solid;
  border-color: rgba(4, 10, 30, 0.96) transparent transparent transparent;
}

.modifier-tag::after {
  content: attr(data-tooltip);
  left: 50%;
  bottom: calc(100% + 14px);
  transform: translate(-50%, 6px);
  width: min(260px, 62vw);
  padding: 10px 12px;
  border-radius: 12px;
  background: rgba(4, 10, 30, 0.96);
  border: 1px solid color-mix(in srgb, var(--accent) 30%, transparent);
  color: var(--text-main);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.26);
  font-size: 12px;
  font-weight: 600;
  line-height: 1.45;
  letter-spacing: 0.1px;
  text-transform: none;
  white-space: normal;
}

.modifier-tag:hover::before,
.modifier-tag:hover::after,
.modifier-tag:focus-visible::before,
.modifier-tag:focus-visible::after {
  opacity: 1;
}

.modifier-tag:hover::before,
.modifier-tag:focus-visible::before {
  transform: translate(-50%, 0);
}

.modifier-tag:hover::after,
.modifier-tag:focus-visible::after {
  transform: translate(-50%, 0);
}

.player-panel {
  border-radius: 18px;
  padding: 14px;
  background: rgba(4, 10, 30, 0.7);
  border: 1px solid color-mix(in srgb, var(--accent-soft) 24%, transparent);
}

.player-panel label {
  display: block;
  margin: 10px 0 4px;
  color: var(--text-main);
  font-size: 13px;
}

.mode-section + .mode-section {
  margin-top: 12px;
}

.mode-label {
  display: block;
  margin-bottom: 8px;
  color: var(--text-main);
  font-size: 13px;
}

.mode-toggle {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.mode-chip {
  min-height: 40px;
  padding: 10px 12px;
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-soft);
  border: 1px solid color-mix(in srgb, var(--accent-soft) 28%, transparent);
  box-shadow: none;
}

.mode-chip.is-active {
  background: linear-gradient(135deg, var(--accent), color-mix(in srgb, var(--accent-soft) 40%, var(--accent)));
  color: var(--button-text);
  border-color: transparent;
  box-shadow: 0 10px 24px color-mix(in srgb, var(--accent) 34%, transparent);
}

.inline-controls {
  display: flex;
  gap: 8px;
}

select {
  width: 100%;
  min-height: 40px;
  border-radius: 12px;
  border: 1px solid color-mix(in srgb, var(--accent) 34%, transparent);
  background: rgba(1, 8, 24, 0.82);
  color: var(--text-main);
  padding: 8px 10px;
}

.hint {
  margin-top: 8px;
  font-size: 12px;
  color: var(--text-soft);
}

.mascot-card {
  display: grid;
  grid-template-columns: 84px minmax(0, 1fr);
  gap: 12px;
  align-items: center;
}

.mascot-avatar {
  min-height: 84px;
  border-radius: 18px;
  display: grid;
  place-items: center;
  background:
    radial-gradient(circle at 35% 28%, rgba(255, 255, 255, 0.18), transparent 34%),
    linear-gradient(135deg, color-mix(in srgb, var(--accent-soft) 40%, transparent), color-mix(in srgb, var(--accent) 48%, transparent));
  border: 1px solid color-mix(in srgb, var(--accent) 26%, transparent);
  color: var(--text-main);
  font-weight: 800;
  font-size: 14px;
  white-space: pre;
  text-align: center;
}

.mascot-copy {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.mascot-copy strong {
  font-size: 1rem;
}

.controls-card p + p,
.save-card p + p {
  margin-top: 8px;
}

kbd {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 32px;
  margin-right: 4px;
  padding: 4px 8px;
  border-radius: 8px;
  border: 1px solid color-mix(in srgb, var(--accent) 32%, transparent);
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-main);
  font-size: 12px;
  font-weight: 700;
}

.game-ad-zone {
  position: relative;
  z-index: 1;
  width: min(96vw, 1180px);
  padding: 12px;
  border-radius: 18px;
  border: 1px solid color-mix(in srgb, var(--accent) 24%, transparent);
  background: rgba(5, 10, 28, 0.78);
  box-shadow: 0 0 24px rgba(0, 0, 0, 0.18);
}

.game-ad-zone ins.adsbygoogle {
  width: 100%;
  min-height: 90px;
}

.overlay {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  background: rgba(1, 4, 14, 0.74);
  backdrop-filter: blur(6px);
  z-index: 10;
}

.overlay.hidden {
  display: none;
}

.panel {
  width: min(92vw, 580px);
  padding: 24px;
  border-radius: 24px;
  border: 1px solid color-mix(in srgb, var(--accent) 34%, transparent);
  background: rgba(8, 13, 32, 0.94);
  box-shadow: 0 18px 36px rgba(0, 0, 0, 0.28);
}

.panel h2 {
  margin-top: 0;
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.panel p {
  margin: 0 0 10px;
  line-height: 1.55;
  color: var(--text-soft);
}

.hidden {
  display: none;
}

@media (max-width: 1000px) {
  .arena-wrap {
    grid-template-columns: 1fr;
  }

  .legend {
    width: min(100%, 640px);
    margin: 0 auto;
  }
}

@media (max-width: 760px) {
  .game-shell {
    padding: 16px;
  }

  .hud,
  .board-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .mascot-card {
    grid-template-columns: 1fr;
  }

  .mascot-avatar {
    min-height: 72px;
  }
}

@media (max-width: 520px) {
  body {
    padding-top: 12px;
  }

  .game-shell,
  .game-ad-zone {
    width: min(98vw, 1180px);
  }

  .board-shell {
    padding: 10px;
    border-radius: 22px;
  }

  .board-grid,
  .tile-layer {
    inset: 10px;
    gap: 8px;
  }

  .touch-controls {
    gap: 8px;
  }
}