:root {
  color-scheme: light;
  --page-bg: #f8fbff;
  --ink: #20242a;
  --muted: #626a73;
  --line: #d7dce3;
  --panel: #ffffff;
  --board-bg: #21242b;
  --board-gap: 6px;
  --board-size: 7;
  --tile-size: 64px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--page-bg);
  color: var(--ink);
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans SC", Arial, sans-serif;
}

button,
input {
  font: inherit;
}

.app {
  width: min(1180px, calc(100vw - 28px));
  min-height: 100vh;
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(320px, 1fr) 280px;
  gap: 22px;
  align-items: center;
  padding: 22px 0;
}

.play-area,
.side-panel,
.start-dialog {
  background: var(--panel);
  border: 1px solid rgba(104, 113, 116, 0.18);
}

.play-area {
  border-radius: 8px;
  padding: 18px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 14px;
}

.eyebrow {
  margin: 0 0 3px;
  color: #607471;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2 {
  margin: 0;
  letter-spacing: 0;
}

h1 {
  font-size: 25px;
}

h2 {
  font-size: 18px;
}

.restart-button,
.start-dialog button {
  border: 0;
  border-radius: 8px;
  background: #00b8ff;
  color: #fff;
  cursor: pointer;
  font-weight: 800;
  min-height: 42px;
  padding: 0 16px;
  transition: background 160ms ease;
}

.restart-button:hover,
.start-dialog button:hover {
  background: #008de6;
}

.restart-button:disabled {
  cursor: wait;
  opacity: 0.62;
  transform: none;
}

.board-wrap {
  display: grid;
  place-items: center;
}

.board {
  position: relative;
  width: min(74vh, 100%);
  max-width: 720px;
  min-width: 300px;
  aspect-ratio: 1;
  border-radius: 8px;
  background: var(--board-bg);
  border: 1px solid #1f2228;
  overflow: hidden;
  touch-action: manipulation;
  user-select: none;
}

.cell-layer {
  position: absolute;
  inset: var(--board-gap);
  display: grid;
  grid-template-columns: repeat(var(--board-size), 1fr);
  grid-template-rows: repeat(var(--board-size), 1fr);
  gap: var(--board-gap);
}

.cell-layer span {
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.1);
}

.tile-layer {
  position: absolute;
  inset: 0;
}

.end-effect {
  position: absolute;
  inset: 0;
  z-index: 90;
  pointer-events: none;
  overflow: hidden;
}

.end-effect.hidden {
  display: none;
}

.halo {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 120%;
  aspect-ratio: 1;
  border: 6px solid rgba(255, 214, 0, 0.82);
  border-radius: 50%;
  transform: translate(-50%, -50%) scale(1.2);
  animation: haloIn 1700ms cubic-bezier(0.2, 0.78, 0.22, 1) infinite;
}

.halo:nth-child(2) {
  width: 98%;
  border-color: rgba(255, 77, 141, 0.78);
  animation-delay: 120ms;
}

.halo:nth-child(3) {
  width: 76%;
  border-color: rgba(47, 128, 237, 0.76);
  animation-delay: 240ms;
}

.halo:nth-child(4) {
  width: 54%;
  border-color: rgba(45, 211, 111, 0.74);
  animation-delay: 360ms;
}

.halo:nth-child(5) {
  width: 32%;
  border-color: rgba(139, 92, 246, 0.76);
  animation-delay: 480ms;
}

.tile {
  position: absolute;
  width: var(--tile-size);
  height: var(--tile-size);
  border: 0;
  border-radius: 7px;
  color: #fff;
  cursor: pointer;
  display: grid;
  grid-template-rows: 0.92fr 1.08fr;
  align-items: center;
  justify-items: center;
  padding: 4px 4px 5px;
  line-height: 1;
  overflow: hidden;
  text-align: center;
  transform: translate(0, 0);
  transition:
    transform 310ms cubic-bezier(0.2, 0.78, 0.25, 1),
    opacity 190ms ease,
    outline-color 180ms ease;
}

.tile-title,
.tile-name {
  width: 100%;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.tile-title {
  align-self: start;
  font-size: min(
    clamp(12px, calc(var(--tile-size) * 0.34), 22px),
    calc((var(--tile-size) - 8px) / 2)
  );
  font-weight: 900;
}

.tile[data-title-length="3"] .tile-title {
  font-size: min(
    clamp(10px, calc(var(--tile-size) * 0.31), 20px),
    calc((var(--tile-size) - 8px) / 3)
  );
}

.tile-name {
  align-self: end;
  margin-top: 0;
  font-size: var(--name-font-size, clamp(8px, calc(var(--tile-size) * 0.15), 11px));
  font-weight: 700;
  line-height: 1.08;
  opacity: 0.9;
}

.tile.player {
  outline: 4px solid #ffe900;
  outline-offset: -4px;
}

.tile.player .tile-name {
  color: #fff300;
  font-weight: 900;
}

.tile.level-6.player .tile-name {
  color: #ff2b80;
}

.tile.selected {
  outline: 4px solid #ffffff;
  outline-offset: -4px;
}

.tile.removing {
  pointer-events: none;
  animation: tileExit 560ms ease both;
}

.tile.removing::after {
  content: "☠";
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  color: #111;
  font-size: min(32px, calc(var(--tile-size) * 0.48));
  line-height: 1;
  animation: skullPop 560ms ease both;
}

.tile.upgraded {
  animation: tilePulse 420ms ease both;
}

.tile.level-0 { background: #00c2a8; }
.tile.level-1 { background: #2f80ed; }
.tile.level-2 { background: #8b5cf6; }
.tile.level-3 { background: #ff4d8d; }
.tile.level-4 { background: #ff8a00; }
.tile.level-5 { background: #2dd36f; }
.tile.level-6 {
  background: #ffd600;
  color: #3a2700;
}

.side-panel {
  border-radius: 8px;
  padding: 16px;
  align-self: stretch;
  display: flex;
  flex-direction: column;
  gap: 16px;
  justify-content: center;
}

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

.stat {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 11px 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.stat span {
  color: var(--muted);
  font-size: 13px;
}

.stat strong {
  font-size: 20px;
}

.message-box {
  min-height: 72px;
  border-left: 4px solid #00b8ff;
  background: #f4fbff;
  border-radius: 0 8px 8px 0;
  padding: 10px 12px;
  display: flex;
  align-items: center;
}

.message-box p {
  margin: 0;
  color: #344144;
  line-height: 1.45;
}

.legend {
  display: grid;
  gap: 8px;
  margin-top: 12px;
}

.legend-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 8px 10px;
}

.legend-rank {
  display: flex;
  align-items: center;
  gap: 9px;
  min-width: 0;
}

.legend-swatch {
  width: 18px;
  height: 18px;
  border-radius: 5px;
  flex: 0 0 auto;
}

.legend small {
  color: var(--muted);
}

.start-screen {
  position: fixed;
  inset: 0;
  background: rgba(33, 40, 42, 0.58);
  display: grid;
  place-items: center;
  padding: 18px;
  z-index: 100;
}

.start-screen.hidden {
  display: none;
}

.start-dialog {
  width: min(380px, 100%);
  border-radius: 8px;
  padding: 22px;
}

.start-dialog label {
  display: block;
  margin: 18px 0 8px;
  color: var(--muted);
  font-weight: 800;
}

.start-dialog input {
  width: 100%;
  min-height: 44px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0 12px;
  outline: none;
}

.start-dialog input:focus {
  border-color: #00b8ff;
}

.start-dialog button {
  width: 100%;
  margin-top: 14px;
}

@keyframes tilePulse {
  0% { transform: translate(var(--tile-x), var(--tile-y)) scale(1); }
  48% { transform: translate(var(--tile-x), var(--tile-y)) scale(1.12); }
  100% { transform: translate(var(--tile-x), var(--tile-y)) scale(1); }
}

@keyframes tileExit {
  0% {
    opacity: 1;
    transform: translate(var(--tile-x), var(--tile-y)) scale(1);
  }
  54% {
    opacity: 1;
    transform: translate(var(--tile-x), var(--tile-y)) scale(0.9) rotate(2deg);
  }
  100% {
    opacity: 0;
    transform: translate(var(--tile-x), var(--tile-y)) scale(0.62) rotate(5deg);
  }
}

@keyframes skullPop {
  0% {
    opacity: 0;
    transform: scale(0.55);
  }
  32% {
    opacity: 1;
    transform: scale(1.18);
  }
  100% {
    opacity: 0;
    transform: scale(1.38);
  }
}

@keyframes haloIn {
  0% {
    opacity: 0;
    transform: translate(-50%, -50%) scale(1.18);
  }
  18% {
    opacity: 1;
  }
  100% {
    opacity: 0;
    transform: translate(-50%, -50%) scale(0.08);
  }
}

@media (max-width: 860px) {
  .app {
    grid-template-columns: 1fr;
    align-items: start;
  }

  .side-panel {
    align-self: auto;
    justify-content: start;
  }

  .stats-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .stat {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
  }

  .board {
    width: min(92vw, 680px);
  }
}

@media (max-width: 520px) {
  :root {
    --board-gap: 4px;
  }

  .app {
    width: min(100vw - 16px, 480px);
    padding: 8px 0 14px;
    gap: 10px;
  }

  .play-area,
  .side-panel {
    padding: 10px;
  }

  .topbar {
    align-items: flex-start;
  }

  h1 {
    font-size: 20px;
  }

  .restart-button {
    min-height: 38px;
    padding: 0 12px;
  }

  .stats-grid {
    grid-template-columns: 1fr 1fr 1fr;
    gap: 6px;
  }

  .stat {
    padding: 8px;
  }

  .stat strong {
    font-size: 16px;
  }
}